Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb LG |
53 | static DEFINE_MUTEX(regulator_list_mutex); |
54 | static LIST_HEAD(regulator_list); | |
55 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 56 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 57 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 58 | static bool has_full_constraints; |
414c70cb | 59 | |
1130e5b3 | 60 | static struct dentry *debugfs_root; |
1130e5b3 | 61 | |
8dc5390d | 62 | /* |
414c70cb LG |
63 | * struct regulator_map |
64 | * | |
65 | * Used to provide symbolic supply names to devices. | |
66 | */ | |
67 | struct regulator_map { | |
68 | struct list_head list; | |
40f9244f | 69 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 70 | const char *supply; |
a5766f11 | 71 | struct regulator_dev *regulator; |
414c70cb LG |
72 | }; |
73 | ||
f19b00da KM |
74 | /* |
75 | * struct regulator_enable_gpio | |
76 | * | |
77 | * Management for shared enable GPIO pin | |
78 | */ | |
79 | struct regulator_enable_gpio { | |
80 | struct list_head list; | |
778b28b4 | 81 | struct gpio_desc *gpiod; |
f19b00da KM |
82 | u32 enable_count; /* a number of enabled shared GPIO */ |
83 | u32 request_count; /* a number of requested shared GPIO */ | |
84 | unsigned int ena_gpio_invert:1; | |
85 | }; | |
86 | ||
a06ccd9c CK |
87 | /* |
88 | * struct regulator_supply_alias | |
89 | * | |
90 | * Used to map lookups for a supply onto an alternative device. | |
91 | */ | |
92 | struct regulator_supply_alias { | |
93 | struct list_head list; | |
94 | struct device *src_dev; | |
95 | const char *src_supply; | |
96 | struct device *alias_dev; | |
97 | const char *alias_supply; | |
98 | }; | |
99 | ||
414c70cb | 100 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 101 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
102 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
103 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
104 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 105 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 106 | unsigned long event, void *data); |
75790251 MB |
107 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
108 | int min_uV, int max_uV); | |
3801b86a MB |
109 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
110 | struct device *dev, | |
111 | const char *supply_name); | |
414c70cb | 112 | |
1083c393 MB |
113 | static const char *rdev_get_name(struct regulator_dev *rdev) |
114 | { | |
115 | if (rdev->constraints && rdev->constraints->name) | |
116 | return rdev->constraints->name; | |
117 | else if (rdev->desc->name) | |
118 | return rdev->desc->name; | |
119 | else | |
120 | return ""; | |
121 | } | |
122 | ||
87b28417 MB |
123 | static bool have_full_constraints(void) |
124 | { | |
75bc9641 | 125 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
126 | } |
127 | ||
69511a45 RN |
128 | /** |
129 | * of_get_regulator - get a regulator device node based on supply name | |
130 | * @dev: Device pointer for the consumer (of regulator) device | |
131 | * @supply: regulator supply name | |
132 | * | |
133 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 134 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
135 | * returns NULL. |
136 | */ | |
137 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
138 | { | |
139 | struct device_node *regnode = NULL; | |
140 | char prop_name[32]; /* 32 is max size of property name */ | |
141 | ||
142 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
143 | ||
144 | snprintf(prop_name, 32, "%s-supply", supply); | |
145 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
146 | ||
147 | if (!regnode) { | |
16fbcc3b | 148 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
149 | prop_name, dev->of_node->full_name); |
150 | return NULL; | |
151 | } | |
152 | return regnode; | |
153 | } | |
154 | ||
6492bc1b MB |
155 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
156 | { | |
157 | if (!rdev->constraints) | |
158 | return 0; | |
159 | ||
160 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
161 | return 1; | |
162 | else | |
163 | return 0; | |
164 | } | |
165 | ||
414c70cb LG |
166 | /* Platform voltage constraint check */ |
167 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
168 | int *min_uV, int *max_uV) | |
169 | { | |
170 | BUG_ON(*min_uV > *max_uV); | |
171 | ||
172 | if (!rdev->constraints) { | |
5da84fd9 | 173 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
174 | return -ENODEV; |
175 | } | |
176 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 177 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
178 | return -EPERM; |
179 | } | |
180 | ||
181 | if (*max_uV > rdev->constraints->max_uV) | |
182 | *max_uV = rdev->constraints->max_uV; | |
183 | if (*min_uV < rdev->constraints->min_uV) | |
184 | *min_uV = rdev->constraints->min_uV; | |
185 | ||
89f425ed MB |
186 | if (*min_uV > *max_uV) { |
187 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 188 | *min_uV, *max_uV); |
414c70cb | 189 | return -EINVAL; |
89f425ed | 190 | } |
414c70cb LG |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
05fda3b1 TP |
195 | /* Make sure we select a voltage that suits the needs of all |
196 | * regulator consumers | |
197 | */ | |
198 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
199 | int *min_uV, int *max_uV) | |
200 | { | |
201 | struct regulator *regulator; | |
202 | ||
203 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
204 | /* |
205 | * Assume consumers that didn't say anything are OK | |
206 | * with anything in the constraint range. | |
207 | */ | |
208 | if (!regulator->min_uV && !regulator->max_uV) | |
209 | continue; | |
210 | ||
05fda3b1 TP |
211 | if (*max_uV > regulator->max_uV) |
212 | *max_uV = regulator->max_uV; | |
213 | if (*min_uV < regulator->min_uV) | |
214 | *min_uV = regulator->min_uV; | |
215 | } | |
216 | ||
dd8004af | 217 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
218 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
219 | *min_uV, *max_uV); | |
05fda3b1 | 220 | return -EINVAL; |
dd8004af | 221 | } |
05fda3b1 TP |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
414c70cb LG |
226 | /* current constraint check */ |
227 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
228 | int *min_uA, int *max_uA) | |
229 | { | |
230 | BUG_ON(*min_uA > *max_uA); | |
231 | ||
232 | if (!rdev->constraints) { | |
5da84fd9 | 233 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
234 | return -ENODEV; |
235 | } | |
236 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 237 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
238 | return -EPERM; |
239 | } | |
240 | ||
241 | if (*max_uA > rdev->constraints->max_uA) | |
242 | *max_uA = rdev->constraints->max_uA; | |
243 | if (*min_uA < rdev->constraints->min_uA) | |
244 | *min_uA = rdev->constraints->min_uA; | |
245 | ||
89f425ed MB |
246 | if (*min_uA > *max_uA) { |
247 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 248 | *min_uA, *max_uA); |
414c70cb | 249 | return -EINVAL; |
89f425ed | 250 | } |
414c70cb LG |
251 | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* operating mode constraint check */ | |
2c608234 | 256 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 257 | { |
2c608234 | 258 | switch (*mode) { |
e573520b DB |
259 | case REGULATOR_MODE_FAST: |
260 | case REGULATOR_MODE_NORMAL: | |
261 | case REGULATOR_MODE_IDLE: | |
262 | case REGULATOR_MODE_STANDBY: | |
263 | break; | |
264 | default: | |
89f425ed | 265 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
266 | return -EINVAL; |
267 | } | |
268 | ||
414c70cb | 269 | if (!rdev->constraints) { |
5da84fd9 | 270 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
271 | return -ENODEV; |
272 | } | |
273 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 274 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
275 | return -EPERM; |
276 | } | |
2c608234 MB |
277 | |
278 | /* The modes are bitmasks, the most power hungry modes having | |
279 | * the lowest values. If the requested mode isn't supported | |
280 | * try higher modes. */ | |
281 | while (*mode) { | |
282 | if (rdev->constraints->valid_modes_mask & *mode) | |
283 | return 0; | |
284 | *mode /= 2; | |
414c70cb | 285 | } |
2c608234 MB |
286 | |
287 | return -EINVAL; | |
414c70cb LG |
288 | } |
289 | ||
290 | /* dynamic regulator mode switching constraint check */ | |
291 | static int regulator_check_drms(struct regulator_dev *rdev) | |
292 | { | |
293 | if (!rdev->constraints) { | |
5da84fd9 | 294 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
295 | return -ENODEV; |
296 | } | |
297 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 298 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
299 | return -EPERM; |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
414c70cb LG |
304 | static ssize_t regulator_uV_show(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
a5766f11 | 307 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
308 | ssize_t ret; |
309 | ||
310 | mutex_lock(&rdev->mutex); | |
311 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
312 | mutex_unlock(&rdev->mutex); | |
313 | ||
314 | return ret; | |
315 | } | |
7ad68e2f | 316 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
317 | |
318 | static ssize_t regulator_uA_show(struct device *dev, | |
319 | struct device_attribute *attr, char *buf) | |
320 | { | |
a5766f11 | 321 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
322 | |
323 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
324 | } | |
7ad68e2f | 325 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 326 | |
587cea27 GKH |
327 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
328 | char *buf) | |
bc558a60 MB |
329 | { |
330 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 331 | |
1083c393 | 332 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 333 | } |
587cea27 | 334 | static DEVICE_ATTR_RO(name); |
bc558a60 | 335 | |
4fca9545 | 336 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 337 | { |
414c70cb LG |
338 | switch (mode) { |
339 | case REGULATOR_MODE_FAST: | |
340 | return sprintf(buf, "fast\n"); | |
341 | case REGULATOR_MODE_NORMAL: | |
342 | return sprintf(buf, "normal\n"); | |
343 | case REGULATOR_MODE_IDLE: | |
344 | return sprintf(buf, "idle\n"); | |
345 | case REGULATOR_MODE_STANDBY: | |
346 | return sprintf(buf, "standby\n"); | |
347 | } | |
348 | return sprintf(buf, "unknown\n"); | |
349 | } | |
350 | ||
4fca9545 DB |
351 | static ssize_t regulator_opmode_show(struct device *dev, |
352 | struct device_attribute *attr, char *buf) | |
414c70cb | 353 | { |
a5766f11 | 354 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 355 | |
4fca9545 DB |
356 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
357 | } | |
7ad68e2f | 358 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
359 | |
360 | static ssize_t regulator_print_state(char *buf, int state) | |
361 | { | |
414c70cb LG |
362 | if (state > 0) |
363 | return sprintf(buf, "enabled\n"); | |
364 | else if (state == 0) | |
365 | return sprintf(buf, "disabled\n"); | |
366 | else | |
367 | return sprintf(buf, "unknown\n"); | |
368 | } | |
369 | ||
4fca9545 DB |
370 | static ssize_t regulator_state_show(struct device *dev, |
371 | struct device_attribute *attr, char *buf) | |
372 | { | |
373 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
374 | ssize_t ret; |
375 | ||
376 | mutex_lock(&rdev->mutex); | |
377 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
378 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 379 | |
9332546f | 380 | return ret; |
4fca9545 | 381 | } |
7ad68e2f | 382 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 383 | |
853116a1 DB |
384 | static ssize_t regulator_status_show(struct device *dev, |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
388 | int status; | |
389 | char *label; | |
390 | ||
391 | status = rdev->desc->ops->get_status(rdev); | |
392 | if (status < 0) | |
393 | return status; | |
394 | ||
395 | switch (status) { | |
396 | case REGULATOR_STATUS_OFF: | |
397 | label = "off"; | |
398 | break; | |
399 | case REGULATOR_STATUS_ON: | |
400 | label = "on"; | |
401 | break; | |
402 | case REGULATOR_STATUS_ERROR: | |
403 | label = "error"; | |
404 | break; | |
405 | case REGULATOR_STATUS_FAST: | |
406 | label = "fast"; | |
407 | break; | |
408 | case REGULATOR_STATUS_NORMAL: | |
409 | label = "normal"; | |
410 | break; | |
411 | case REGULATOR_STATUS_IDLE: | |
412 | label = "idle"; | |
413 | break; | |
414 | case REGULATOR_STATUS_STANDBY: | |
415 | label = "standby"; | |
416 | break; | |
f59c8f9f MB |
417 | case REGULATOR_STATUS_BYPASS: |
418 | label = "bypass"; | |
419 | break; | |
1beaf762 KG |
420 | case REGULATOR_STATUS_UNDEFINED: |
421 | label = "undefined"; | |
422 | break; | |
853116a1 DB |
423 | default: |
424 | return -ERANGE; | |
425 | } | |
426 | ||
427 | return sprintf(buf, "%s\n", label); | |
428 | } | |
429 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
430 | ||
414c70cb LG |
431 | static ssize_t regulator_min_uA_show(struct device *dev, |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | |
436 | if (!rdev->constraints) | |
437 | return sprintf(buf, "constraint not defined\n"); | |
438 | ||
439 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
440 | } | |
7ad68e2f | 441 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
442 | |
443 | static ssize_t regulator_max_uA_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
447 | |
448 | if (!rdev->constraints) | |
449 | return sprintf(buf, "constraint not defined\n"); | |
450 | ||
451 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
452 | } | |
7ad68e2f | 453 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
454 | |
455 | static ssize_t regulator_min_uV_show(struct device *dev, | |
456 | struct device_attribute *attr, char *buf) | |
457 | { | |
a5766f11 | 458 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
459 | |
460 | if (!rdev->constraints) | |
461 | return sprintf(buf, "constraint not defined\n"); | |
462 | ||
463 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
464 | } | |
7ad68e2f | 465 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
466 | |
467 | static ssize_t regulator_max_uV_show(struct device *dev, | |
468 | struct device_attribute *attr, char *buf) | |
469 | { | |
a5766f11 | 470 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
471 | |
472 | if (!rdev->constraints) | |
473 | return sprintf(buf, "constraint not defined\n"); | |
474 | ||
475 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
476 | } | |
7ad68e2f | 477 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
478 | |
479 | static ssize_t regulator_total_uA_show(struct device *dev, | |
480 | struct device_attribute *attr, char *buf) | |
481 | { | |
a5766f11 | 482 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
483 | struct regulator *regulator; |
484 | int uA = 0; | |
485 | ||
486 | mutex_lock(&rdev->mutex); | |
487 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 488 | uA += regulator->uA_load; |
414c70cb LG |
489 | mutex_unlock(&rdev->mutex); |
490 | return sprintf(buf, "%d\n", uA); | |
491 | } | |
7ad68e2f | 492 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 493 | |
587cea27 GKH |
494 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
495 | char *buf) | |
414c70cb | 496 | { |
a5766f11 | 497 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
498 | return sprintf(buf, "%d\n", rdev->use_count); |
499 | } | |
587cea27 | 500 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 501 | |
587cea27 GKH |
502 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
503 | char *buf) | |
414c70cb | 504 | { |
a5766f11 | 505 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
506 | |
507 | switch (rdev->desc->type) { | |
508 | case REGULATOR_VOLTAGE: | |
509 | return sprintf(buf, "voltage\n"); | |
510 | case REGULATOR_CURRENT: | |
511 | return sprintf(buf, "current\n"); | |
512 | } | |
513 | return sprintf(buf, "unknown\n"); | |
514 | } | |
587cea27 | 515 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
516 | |
517 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
518 | struct device_attribute *attr, char *buf) | |
519 | { | |
a5766f11 | 520 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 521 | |
414c70cb LG |
522 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
523 | } | |
7ad68e2f DB |
524 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
525 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
526 | |
527 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
528 | struct device_attribute *attr, char *buf) | |
529 | { | |
a5766f11 | 530 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 531 | |
414c70cb LG |
532 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
533 | } | |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
535 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
414c70cb LG |
542 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
543 | } | |
7ad68e2f DB |
544 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
545 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 546 | |
414c70cb LG |
547 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
548 | struct device_attribute *attr, char *buf) | |
549 | { | |
a5766f11 | 550 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 551 | |
4fca9545 DB |
552 | return regulator_print_opmode(buf, |
553 | rdev->constraints->state_mem.mode); | |
414c70cb | 554 | } |
7ad68e2f DB |
555 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
556 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
557 | |
558 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
559 | struct device_attribute *attr, char *buf) | |
560 | { | |
a5766f11 | 561 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 562 | |
4fca9545 DB |
563 | return regulator_print_opmode(buf, |
564 | rdev->constraints->state_disk.mode); | |
414c70cb | 565 | } |
7ad68e2f DB |
566 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
567 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
568 | |
569 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
570 | struct device_attribute *attr, char *buf) | |
571 | { | |
a5766f11 | 572 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 573 | |
4fca9545 DB |
574 | return regulator_print_opmode(buf, |
575 | rdev->constraints->state_standby.mode); | |
414c70cb | 576 | } |
7ad68e2f DB |
577 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
578 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
579 | |
580 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
581 | struct device_attribute *attr, char *buf) | |
582 | { | |
a5766f11 | 583 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 584 | |
4fca9545 DB |
585 | return regulator_print_state(buf, |
586 | rdev->constraints->state_mem.enabled); | |
414c70cb | 587 | } |
7ad68e2f DB |
588 | static DEVICE_ATTR(suspend_mem_state, 0444, |
589 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
590 | |
591 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
592 | struct device_attribute *attr, char *buf) | |
593 | { | |
a5766f11 | 594 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 595 | |
4fca9545 DB |
596 | return regulator_print_state(buf, |
597 | rdev->constraints->state_disk.enabled); | |
414c70cb | 598 | } |
7ad68e2f DB |
599 | static DEVICE_ATTR(suspend_disk_state, 0444, |
600 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
601 | |
602 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
603 | struct device_attribute *attr, char *buf) | |
604 | { | |
a5766f11 | 605 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 606 | |
4fca9545 DB |
607 | return regulator_print_state(buf, |
608 | rdev->constraints->state_standby.enabled); | |
414c70cb | 609 | } |
7ad68e2f DB |
610 | static DEVICE_ATTR(suspend_standby_state, 0444, |
611 | regulator_suspend_standby_state_show, NULL); | |
612 | ||
f59c8f9f MB |
613 | static ssize_t regulator_bypass_show(struct device *dev, |
614 | struct device_attribute *attr, char *buf) | |
615 | { | |
616 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
617 | const char *report; | |
618 | bool bypass; | |
619 | int ret; | |
620 | ||
621 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
622 | ||
623 | if (ret != 0) | |
624 | report = "unknown"; | |
625 | else if (bypass) | |
626 | report = "enabled"; | |
627 | else | |
628 | report = "disabled"; | |
629 | ||
630 | return sprintf(buf, "%s\n", report); | |
631 | } | |
632 | static DEVICE_ATTR(bypass, 0444, | |
633 | regulator_bypass_show, NULL); | |
bc558a60 | 634 | |
414c70cb LG |
635 | /* Calculate the new optimum regulator operating mode based on the new total |
636 | * consumer load. All locks held by caller */ | |
8460ef38 | 637 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
638 | { |
639 | struct regulator *sibling; | |
640 | int current_uA = 0, output_uV, input_uV, err; | |
641 | unsigned int mode; | |
642 | ||
8460ef38 BA |
643 | /* |
644 | * first check to see if we can set modes at all, otherwise just | |
645 | * tell the consumer everything is OK. | |
646 | */ | |
414c70cb | 647 | err = regulator_check_drms(rdev); |
8460ef38 BA |
648 | if (err < 0) |
649 | return 0; | |
650 | ||
8f4490e0 BA |
651 | if (!rdev->desc->ops->get_optimum_mode && |
652 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
653 | return 0; |
654 | ||
8f4490e0 BA |
655 | if (!rdev->desc->ops->set_mode && |
656 | !rdev->desc->ops->set_load) | |
8460ef38 | 657 | return -EINVAL; |
414c70cb LG |
658 | |
659 | /* get output voltage */ | |
1bf5a1f8 | 660 | output_uV = _regulator_get_voltage(rdev); |
8460ef38 BA |
661 | if (output_uV <= 0) { |
662 | rdev_err(rdev, "invalid output voltage found\n"); | |
663 | return -EINVAL; | |
664 | } | |
414c70cb LG |
665 | |
666 | /* get input voltage */ | |
1bf5a1f8 MB |
667 | input_uV = 0; |
668 | if (rdev->supply) | |
3f24f5ad | 669 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 670 | if (input_uV <= 0) |
414c70cb | 671 | input_uV = rdev->constraints->input_uV; |
8460ef38 BA |
672 | if (input_uV <= 0) { |
673 | rdev_err(rdev, "invalid input voltage found\n"); | |
674 | return -EINVAL; | |
675 | } | |
414c70cb LG |
676 | |
677 | /* calc total requested load */ | |
678 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 679 | current_uA += sibling->uA_load; |
414c70cb | 680 | |
8f4490e0 BA |
681 | if (rdev->desc->ops->set_load) { |
682 | /* set the optimum mode for our new total regulator load */ | |
683 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
684 | if (err < 0) | |
685 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
686 | } else { | |
687 | /* now get the optimum mode for our new total regulator load */ | |
688 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
689 | output_uV, current_uA); | |
690 | ||
691 | /* check the new mode is allowed */ | |
692 | err = regulator_mode_constrain(rdev, &mode); | |
693 | if (err < 0) { | |
694 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
695 | current_uA, input_uV, output_uV); | |
696 | return err; | |
697 | } | |
414c70cb | 698 | |
8f4490e0 BA |
699 | err = rdev->desc->ops->set_mode(rdev, mode); |
700 | if (err < 0) | |
701 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
702 | } |
703 | ||
8460ef38 | 704 | return err; |
414c70cb LG |
705 | } |
706 | ||
707 | static int suspend_set_state(struct regulator_dev *rdev, | |
708 | struct regulator_state *rstate) | |
709 | { | |
710 | int ret = 0; | |
638f85c5 MB |
711 | |
712 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
713 | * only warn if the driver implements set_suspend_voltage or |
714 | * set_suspend_mode callback. | |
638f85c5 MB |
715 | */ |
716 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
717 | if (rdev->desc->ops->set_suspend_voltage || |
718 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 719 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
720 | return 0; |
721 | } | |
722 | ||
723 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 724 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
725 | return -EINVAL; |
726 | } | |
414c70cb | 727 | |
8ac0e95d | 728 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 729 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 730 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 731 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
732 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
733 | ret = 0; | |
734 | ||
414c70cb | 735 | if (ret < 0) { |
5da84fd9 | 736 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
737 | return ret; |
738 | } | |
739 | ||
740 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
741 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
742 | if (ret < 0) { | |
5da84fd9 | 743 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
744 | return ret; |
745 | } | |
746 | } | |
747 | ||
748 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
749 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
750 | if (ret < 0) { | |
5da84fd9 | 751 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
752 | return ret; |
753 | } | |
754 | } | |
755 | return ret; | |
756 | } | |
757 | ||
758 | /* locks held by caller */ | |
759 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
760 | { | |
761 | if (!rdev->constraints) | |
762 | return -EINVAL; | |
763 | ||
764 | switch (state) { | |
765 | case PM_SUSPEND_STANDBY: | |
766 | return suspend_set_state(rdev, | |
767 | &rdev->constraints->state_standby); | |
768 | case PM_SUSPEND_MEM: | |
769 | return suspend_set_state(rdev, | |
770 | &rdev->constraints->state_mem); | |
771 | case PM_SUSPEND_MAX: | |
772 | return suspend_set_state(rdev, | |
773 | &rdev->constraints->state_disk); | |
774 | default: | |
775 | return -EINVAL; | |
776 | } | |
777 | } | |
778 | ||
779 | static void print_constraints(struct regulator_dev *rdev) | |
780 | { | |
781 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 782 | char buf[80] = ""; |
8f031b48 MB |
783 | int count = 0; |
784 | int ret; | |
414c70cb | 785 | |
8f031b48 | 786 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 787 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
788 | count += sprintf(buf + count, "%d mV ", |
789 | constraints->min_uV / 1000); | |
414c70cb | 790 | else |
8f031b48 MB |
791 | count += sprintf(buf + count, "%d <--> %d mV ", |
792 | constraints->min_uV / 1000, | |
793 | constraints->max_uV / 1000); | |
794 | } | |
795 | ||
796 | if (!constraints->min_uV || | |
797 | constraints->min_uV != constraints->max_uV) { | |
798 | ret = _regulator_get_voltage(rdev); | |
799 | if (ret > 0) | |
800 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
801 | } | |
802 | ||
bf5892a8 MB |
803 | if (constraints->uV_offset) |
804 | count += sprintf(buf, "%dmV offset ", | |
805 | constraints->uV_offset / 1000); | |
806 | ||
8f031b48 | 807 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 808 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
809 | count += sprintf(buf + count, "%d mA ", |
810 | constraints->min_uA / 1000); | |
414c70cb | 811 | else |
8f031b48 MB |
812 | count += sprintf(buf + count, "%d <--> %d mA ", |
813 | constraints->min_uA / 1000, | |
814 | constraints->max_uA / 1000); | |
815 | } | |
816 | ||
817 | if (!constraints->min_uA || | |
818 | constraints->min_uA != constraints->max_uA) { | |
819 | ret = _regulator_get_current_limit(rdev); | |
820 | if (ret > 0) | |
e4a6376b | 821 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 822 | } |
8f031b48 | 823 | |
414c70cb LG |
824 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
825 | count += sprintf(buf + count, "fast "); | |
826 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
827 | count += sprintf(buf + count, "normal "); | |
828 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
829 | count += sprintf(buf + count, "idle "); | |
830 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
831 | count += sprintf(buf + count, "standby"); | |
832 | ||
215b8b05 UKK |
833 | if (!count) |
834 | sprintf(buf, "no parameters"); | |
835 | ||
194dbaef | 836 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
837 | |
838 | if ((constraints->min_uV != constraints->max_uV) && | |
839 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
840 | rdev_warn(rdev, | |
841 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
842 | } |
843 | ||
e79055d6 | 844 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 845 | struct regulation_constraints *constraints) |
a5766f11 | 846 | { |
272e2315 | 847 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
848 | int ret; |
849 | ||
850 | /* do we need to apply the constraint voltage */ | |
851 | if (rdev->constraints->apply_uV && | |
75790251 | 852 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
064d5cd1 AB |
853 | int current_uV = _regulator_get_voltage(rdev); |
854 | if (current_uV < 0) { | |
69d58839 NM |
855 | rdev_err(rdev, |
856 | "failed to get the current voltage(%d)\n", | |
857 | current_uV); | |
064d5cd1 AB |
858 | return current_uV; |
859 | } | |
860 | if (current_uV < rdev->constraints->min_uV || | |
861 | current_uV > rdev->constraints->max_uV) { | |
862 | ret = _regulator_do_set_voltage( | |
863 | rdev, rdev->constraints->min_uV, | |
864 | rdev->constraints->max_uV); | |
865 | if (ret < 0) { | |
866 | rdev_err(rdev, | |
69d58839 NM |
867 | "failed to apply %duV constraint(%d)\n", |
868 | rdev->constraints->min_uV, ret); | |
064d5cd1 AB |
869 | return ret; |
870 | } | |
75790251 | 871 | } |
af5866c9 | 872 | } |
e06f5b4f | 873 | |
4367cfdc DB |
874 | /* constrain machine-level voltage specs to fit |
875 | * the actual range supported by this regulator. | |
876 | */ | |
877 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
878 | int count = rdev->desc->n_voltages; | |
879 | int i; | |
880 | int min_uV = INT_MAX; | |
881 | int max_uV = INT_MIN; | |
882 | int cmin = constraints->min_uV; | |
883 | int cmax = constraints->max_uV; | |
884 | ||
3e590918 MB |
885 | /* it's safe to autoconfigure fixed-voltage supplies |
886 | and the constraints are used by list_voltage. */ | |
4367cfdc | 887 | if (count == 1 && !cmin) { |
3e590918 | 888 | cmin = 1; |
4367cfdc | 889 | cmax = INT_MAX; |
3e590918 MB |
890 | constraints->min_uV = cmin; |
891 | constraints->max_uV = cmax; | |
4367cfdc DB |
892 | } |
893 | ||
3e2b9abd MB |
894 | /* voltage constraints are optional */ |
895 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 896 | return 0; |
3e2b9abd | 897 | |
4367cfdc | 898 | /* else require explicit machine-level constraints */ |
3e2b9abd | 899 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 900 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 901 | return -EINVAL; |
4367cfdc DB |
902 | } |
903 | ||
904 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
905 | for (i = 0; i < count; i++) { | |
906 | int value; | |
907 | ||
908 | value = ops->list_voltage(rdev, i); | |
909 | if (value <= 0) | |
910 | continue; | |
911 | ||
912 | /* maybe adjust [min_uV..max_uV] */ | |
913 | if (value >= cmin && value < min_uV) | |
914 | min_uV = value; | |
915 | if (value <= cmax && value > max_uV) | |
916 | max_uV = value; | |
917 | } | |
918 | ||
919 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
920 | if (max_uV < min_uV) { | |
fff15bef MB |
921 | rdev_err(rdev, |
922 | "unsupportable voltage constraints %u-%uuV\n", | |
923 | min_uV, max_uV); | |
e79055d6 | 924 | return -EINVAL; |
4367cfdc DB |
925 | } |
926 | ||
927 | /* use regulator's subset of machine constraints */ | |
928 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
929 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
930 | constraints->min_uV, min_uV); | |
4367cfdc DB |
931 | constraints->min_uV = min_uV; |
932 | } | |
933 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
934 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
935 | constraints->max_uV, max_uV); | |
4367cfdc DB |
936 | constraints->max_uV = max_uV; |
937 | } | |
938 | } | |
939 | ||
e79055d6 MB |
940 | return 0; |
941 | } | |
942 | ||
f8c1700d LD |
943 | static int machine_constraints_current(struct regulator_dev *rdev, |
944 | struct regulation_constraints *constraints) | |
945 | { | |
272e2315 | 946 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
947 | int ret; |
948 | ||
949 | if (!constraints->min_uA && !constraints->max_uA) | |
950 | return 0; | |
951 | ||
952 | if (constraints->min_uA > constraints->max_uA) { | |
953 | rdev_err(rdev, "Invalid current constraints\n"); | |
954 | return -EINVAL; | |
955 | } | |
956 | ||
957 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
958 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
959 | return 0; | |
960 | } | |
961 | ||
962 | /* Set regulator current in constraints range */ | |
963 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
964 | constraints->max_uA); | |
965 | if (ret < 0) { | |
966 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
967 | return ret; | |
968 | } | |
969 | ||
970 | return 0; | |
971 | } | |
972 | ||
30c21971 MP |
973 | static int _regulator_do_enable(struct regulator_dev *rdev); |
974 | ||
e79055d6 MB |
975 | /** |
976 | * set_machine_constraints - sets regulator constraints | |
977 | * @rdev: regulator source | |
978 | * @constraints: constraints to apply | |
979 | * | |
980 | * Allows platform initialisation code to define and constrain | |
981 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
982 | * Constraints *must* be set by platform code in order for some | |
983 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
984 | * set_mode. | |
985 | */ | |
986 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 987 | const struct regulation_constraints *constraints) |
e79055d6 MB |
988 | { |
989 | int ret = 0; | |
272e2315 | 990 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 991 | |
9a8f5e07 MB |
992 | if (constraints) |
993 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
994 | GFP_KERNEL); | |
995 | else | |
996 | rdev->constraints = kzalloc(sizeof(*constraints), | |
997 | GFP_KERNEL); | |
f8c12fe3 MB |
998 | if (!rdev->constraints) |
999 | return -ENOMEM; | |
af5866c9 | 1000 | |
f8c12fe3 | 1001 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
1002 | if (ret != 0) |
1003 | goto out; | |
1004 | ||
f8c1700d | 1005 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 MB |
1006 | if (ret != 0) |
1007 | goto out; | |
1008 | ||
a5766f11 | 1009 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1010 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1011 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1012 | if (ret < 0) { |
5da84fd9 | 1013 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
1014 | goto out; |
1015 | } | |
1016 | } | |
a5766f11 | 1017 | |
9a8f5e07 | 1018 | if (rdev->constraints->initial_mode) { |
a308466c | 1019 | if (!ops->set_mode) { |
5da84fd9 | 1020 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
1021 | ret = -EINVAL; |
1022 | goto out; | |
1023 | } | |
1024 | ||
f8c12fe3 | 1025 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1026 | if (ret < 0) { |
5da84fd9 | 1027 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
1028 | goto out; |
1029 | } | |
1030 | } | |
1031 | ||
cacf90f2 MB |
1032 | /* If the constraints say the regulator should be on at this point |
1033 | * and we have control then make sure it is enabled. | |
1034 | */ | |
30c21971 MP |
1035 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1036 | ret = _regulator_do_enable(rdev); | |
1037 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1038 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
1039 | goto out; |
1040 | } | |
1041 | } | |
1042 | ||
1653ccf4 YSB |
1043 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1044 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1045 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1046 | if (ret < 0) { | |
1047 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
1048 | goto out; | |
1049 | } | |
1050 | } | |
1051 | ||
a5766f11 | 1052 | print_constraints(rdev); |
1a6958e7 | 1053 | return 0; |
a5766f11 | 1054 | out: |
1a6958e7 AL |
1055 | kfree(rdev->constraints); |
1056 | rdev->constraints = NULL; | |
a5766f11 LG |
1057 | return ret; |
1058 | } | |
1059 | ||
1060 | /** | |
1061 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1062 | * @rdev: regulator name |
1063 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1064 | * |
1065 | * Called by platform initialisation code to set the supply regulator for this | |
1066 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1067 | * core if it's child is enabled. | |
1068 | */ | |
1069 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1070 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1071 | { |
1072 | int err; | |
1073 | ||
3801b86a MB |
1074 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1075 | ||
1076 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1077 | if (rdev->supply == NULL) { |
1078 | err = -ENOMEM; | |
3801b86a | 1079 | return err; |
a5766f11 | 1080 | } |
57ad526a | 1081 | supply_rdev->open_count++; |
3801b86a MB |
1082 | |
1083 | return 0; | |
a5766f11 LG |
1084 | } |
1085 | ||
1086 | /** | |
06c63f93 | 1087 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1088 | * @rdev: regulator source |
40f9244f | 1089 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1090 | * @supply: symbolic name for supply |
a5766f11 LG |
1091 | * |
1092 | * Allows platform initialisation code to map physical regulator | |
1093 | * sources to symbolic names for supplies for use by devices. Devices | |
1094 | * should use these symbolic names to request regulators, avoiding the | |
1095 | * need to provide board-specific regulator names as platform data. | |
1096 | */ | |
1097 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1098 | const char *consumer_dev_name, |
1099 | const char *supply) | |
a5766f11 LG |
1100 | { |
1101 | struct regulator_map *node; | |
9ed2099e | 1102 | int has_dev; |
a5766f11 LG |
1103 | |
1104 | if (supply == NULL) | |
1105 | return -EINVAL; | |
1106 | ||
9ed2099e MB |
1107 | if (consumer_dev_name != NULL) |
1108 | has_dev = 1; | |
1109 | else | |
1110 | has_dev = 0; | |
1111 | ||
6001e13c | 1112 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1113 | if (node->dev_name && consumer_dev_name) { |
1114 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1115 | continue; | |
1116 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1117 | continue; |
23b5cc2a JN |
1118 | } |
1119 | ||
6001e13c DB |
1120 | if (strcmp(node->supply, supply) != 0) |
1121 | continue; | |
1122 | ||
737f360d MB |
1123 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1124 | consumer_dev_name, | |
1125 | dev_name(&node->regulator->dev), | |
1126 | node->regulator->desc->name, | |
1127 | supply, | |
1128 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1129 | return -EBUSY; |
1130 | } | |
1131 | ||
9ed2099e | 1132 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1133 | if (node == NULL) |
1134 | return -ENOMEM; | |
1135 | ||
1136 | node->regulator = rdev; | |
a5766f11 LG |
1137 | node->supply = supply; |
1138 | ||
9ed2099e MB |
1139 | if (has_dev) { |
1140 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1141 | if (node->dev_name == NULL) { | |
1142 | kfree(node); | |
1143 | return -ENOMEM; | |
1144 | } | |
40f9244f MB |
1145 | } |
1146 | ||
a5766f11 LG |
1147 | list_add(&node->list, ®ulator_map_list); |
1148 | return 0; | |
1149 | } | |
1150 | ||
0f1d747b MR |
1151 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1152 | { | |
1153 | struct regulator_map *node, *n; | |
1154 | ||
1155 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1156 | if (rdev == node->regulator) { | |
1157 | list_del(&node->list); | |
40f9244f | 1158 | kfree(node->dev_name); |
0f1d747b | 1159 | kfree(node); |
0f1d747b MR |
1160 | } |
1161 | } | |
1162 | } | |
1163 | ||
f5726ae3 | 1164 | #define REG_STR_SIZE 64 |
414c70cb LG |
1165 | |
1166 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1167 | struct device *dev, | |
1168 | const char *supply_name) | |
1169 | { | |
1170 | struct regulator *regulator; | |
1171 | char buf[REG_STR_SIZE]; | |
1172 | int err, size; | |
1173 | ||
1174 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1175 | if (regulator == NULL) | |
1176 | return NULL; | |
1177 | ||
1178 | mutex_lock(&rdev->mutex); | |
1179 | regulator->rdev = rdev; | |
1180 | list_add(®ulator->list, &rdev->consumer_list); | |
1181 | ||
1182 | if (dev) { | |
e2c98eaf SG |
1183 | regulator->dev = dev; |
1184 | ||
222cc7b1 | 1185 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1186 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1187 | dev->kobj.name, supply_name); | |
1188 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1189 | goto overflow_err; |
414c70cb LG |
1190 | |
1191 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1192 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1193 | goto overflow_err; |
414c70cb LG |
1194 | |
1195 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1196 | buf); | |
1197 | if (err) { | |
5da84fd9 JP |
1198 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1199 | dev->kobj.name, err); | |
222cc7b1 | 1200 | /* non-fatal */ |
414c70cb | 1201 | } |
5de70519 MB |
1202 | } else { |
1203 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1204 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1205 | goto overflow_err; |
5de70519 MB |
1206 | } |
1207 | ||
5de70519 MB |
1208 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1209 | rdev->debugfs); | |
24751434 | 1210 | if (!regulator->debugfs) { |
5de70519 | 1211 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1212 | } else { |
1213 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1214 | ®ulator->uA_load); | |
1215 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1216 | ®ulator->min_uV); | |
1217 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1218 | ®ulator->max_uV); | |
414c70cb | 1219 | } |
5de70519 | 1220 | |
6492bc1b MB |
1221 | /* |
1222 | * Check now if the regulator is an always on regulator - if | |
1223 | * it is then we don't need to do nearly so much work for | |
1224 | * enable/disable calls. | |
1225 | */ | |
1226 | if (!_regulator_can_change_status(rdev) && | |
1227 | _regulator_is_enabled(rdev)) | |
1228 | regulator->always_on = true; | |
1229 | ||
414c70cb LG |
1230 | mutex_unlock(&rdev->mutex); |
1231 | return regulator; | |
414c70cb LG |
1232 | overflow_err: |
1233 | list_del(®ulator->list); | |
1234 | kfree(regulator); | |
1235 | mutex_unlock(&rdev->mutex); | |
1236 | return NULL; | |
1237 | } | |
1238 | ||
31aae2be MB |
1239 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1240 | { | |
00c877c6 LD |
1241 | if (rdev->constraints && rdev->constraints->enable_time) |
1242 | return rdev->constraints->enable_time; | |
31aae2be | 1243 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1244 | return rdev->desc->enable_time; |
31aae2be MB |
1245 | return rdev->desc->ops->enable_time(rdev); |
1246 | } | |
1247 | ||
a06ccd9c CK |
1248 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1249 | struct device *dev, const char *supply) | |
1250 | { | |
1251 | struct regulator_supply_alias *map; | |
1252 | ||
1253 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1254 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1255 | return map; | |
1256 | ||
1257 | return NULL; | |
1258 | } | |
1259 | ||
1260 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1261 | { | |
1262 | struct regulator_supply_alias *map; | |
1263 | ||
1264 | map = regulator_find_supply_alias(*dev, *supply); | |
1265 | if (map) { | |
1266 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1267 | *supply, map->alias_supply, | |
1268 | dev_name(map->alias_dev)); | |
1269 | *dev = map->alias_dev; | |
1270 | *supply = map->alias_supply; | |
1271 | } | |
1272 | } | |
1273 | ||
69511a45 | 1274 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1275 | const char *supply, |
1276 | int *ret) | |
69511a45 RN |
1277 | { |
1278 | struct regulator_dev *r; | |
1279 | struct device_node *node; | |
576ca436 MB |
1280 | struct regulator_map *map; |
1281 | const char *devname = NULL; | |
69511a45 | 1282 | |
a06ccd9c CK |
1283 | regulator_supply_alias(&dev, &supply); |
1284 | ||
69511a45 RN |
1285 | /* first do a dt based lookup */ |
1286 | if (dev && dev->of_node) { | |
1287 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1288 | if (node) { |
69511a45 RN |
1289 | list_for_each_entry(r, ®ulator_list, list) |
1290 | if (r->dev.parent && | |
1291 | node == r->dev.of_node) | |
1292 | return r; | |
317b5684 MB |
1293 | *ret = -EPROBE_DEFER; |
1294 | return NULL; | |
6d191a5f MB |
1295 | } else { |
1296 | /* | |
1297 | * If we couldn't even get the node then it's | |
1298 | * not just that the device didn't register | |
1299 | * yet, there's no node and we'll never | |
1300 | * succeed. | |
1301 | */ | |
1302 | *ret = -ENODEV; | |
1303 | } | |
69511a45 RN |
1304 | } |
1305 | ||
1306 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1307 | if (dev) |
1308 | devname = dev_name(dev); | |
1309 | ||
69511a45 RN |
1310 | list_for_each_entry(r, ®ulator_list, list) |
1311 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1312 | return r; | |
1313 | ||
576ca436 MB |
1314 | list_for_each_entry(map, ®ulator_map_list, list) { |
1315 | /* If the mapping has a device set up it must match */ | |
1316 | if (map->dev_name && | |
1317 | (!devname || strcmp(map->dev_name, devname))) | |
1318 | continue; | |
1319 | ||
1320 | if (strcmp(map->supply, supply) == 0) | |
1321 | return map->regulator; | |
1322 | } | |
1323 | ||
1324 | ||
69511a45 RN |
1325 | return NULL; |
1326 | } | |
1327 | ||
6261b06d BA |
1328 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1329 | { | |
1330 | struct regulator_dev *r; | |
1331 | struct device *dev = rdev->dev.parent; | |
1332 | int ret; | |
1333 | ||
1334 | /* No supply to resovle? */ | |
1335 | if (!rdev->supply_name) | |
1336 | return 0; | |
1337 | ||
1338 | /* Supply already resolved? */ | |
1339 | if (rdev->supply) | |
1340 | return 0; | |
1341 | ||
1342 | r = regulator_dev_lookup(dev, rdev->supply_name, &ret); | |
1343 | if (ret == -ENODEV) { | |
1344 | /* | |
1345 | * No supply was specified for this regulator and | |
1346 | * there will never be one. | |
1347 | */ | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | if (!r) { | |
1352 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1353 | rdev->supply_name, rdev->desc->name); | |
1354 | return -EPROBE_DEFER; | |
1355 | } | |
1356 | ||
1357 | /* Recursively resolve the supply of the supply */ | |
1358 | ret = regulator_resolve_supply(r); | |
1359 | if (ret < 0) | |
1360 | return ret; | |
1361 | ||
1362 | ret = set_supply(rdev, r); | |
1363 | if (ret < 0) | |
1364 | return ret; | |
1365 | ||
1366 | /* Cascade always-on state to supply */ | |
1367 | if (_regulator_is_enabled(rdev)) { | |
1368 | ret = regulator_enable(rdev->supply); | |
1369 | if (ret < 0) | |
1370 | return ret; | |
1371 | } | |
1372 | ||
1373 | return 0; | |
1374 | } | |
1375 | ||
5ffbd136 MB |
1376 | /* Internal regulator request function */ |
1377 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1378 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1379 | { |
1380 | struct regulator_dev *rdev; | |
04bf3011 | 1381 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1382 | const char *devname = NULL; |
317b5684 | 1383 | int ret; |
414c70cb LG |
1384 | |
1385 | if (id == NULL) { | |
5da84fd9 | 1386 | pr_err("get() with no identifier\n"); |
043c998f | 1387 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1388 | } |
1389 | ||
40f9244f MB |
1390 | if (dev) |
1391 | devname = dev_name(dev); | |
1392 | ||
317b5684 MB |
1393 | if (have_full_constraints()) |
1394 | ret = -ENODEV; | |
1395 | else | |
1396 | ret = -EPROBE_DEFER; | |
1397 | ||
414c70cb LG |
1398 | mutex_lock(®ulator_list_mutex); |
1399 | ||
6d191a5f | 1400 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1401 | if (rdev) |
1402 | goto found; | |
1403 | ||
ef60abbb MB |
1404 | regulator = ERR_PTR(ret); |
1405 | ||
1e4b545c NM |
1406 | /* |
1407 | * If we have return value from dev_lookup fail, we do not expect to | |
1408 | * succeed, so, quit with appropriate error value | |
1409 | */ | |
0d25d09d | 1410 | if (ret && ret != -ENODEV) |
1e4b545c | 1411 | goto out; |
1e4b545c | 1412 | |
34abbd68 MB |
1413 | if (!devname) |
1414 | devname = "deviceless"; | |
1415 | ||
4ddfebd3 MB |
1416 | /* |
1417 | * Assume that a regulator is physically present and enabled | |
1418 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1419 | */ |
87b28417 | 1420 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1421 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1422 | devname, id); | |
4ddfebd3 | 1423 | |
34abbd68 MB |
1424 | rdev = dummy_regulator_rdev; |
1425 | goto found; | |
0781719b HG |
1426 | /* Don't log an error when called from regulator_get_optional() */ |
1427 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1428 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1429 | } |
34abbd68 | 1430 | |
414c70cb LG |
1431 | mutex_unlock(®ulator_list_mutex); |
1432 | return regulator; | |
1433 | ||
1434 | found: | |
5ffbd136 MB |
1435 | if (rdev->exclusive) { |
1436 | regulator = ERR_PTR(-EPERM); | |
1437 | goto out; | |
1438 | } | |
1439 | ||
1440 | if (exclusive && rdev->open_count) { | |
1441 | regulator = ERR_PTR(-EBUSY); | |
1442 | goto out; | |
1443 | } | |
1444 | ||
6261b06d BA |
1445 | ret = regulator_resolve_supply(rdev); |
1446 | if (ret < 0) { | |
1447 | regulator = ERR_PTR(ret); | |
1448 | goto out; | |
1449 | } | |
1450 | ||
a5766f11 LG |
1451 | if (!try_module_get(rdev->owner)) |
1452 | goto out; | |
1453 | ||
414c70cb LG |
1454 | regulator = create_regulator(rdev, dev, id); |
1455 | if (regulator == NULL) { | |
1456 | regulator = ERR_PTR(-ENOMEM); | |
1457 | module_put(rdev->owner); | |
bcda4321 | 1458 | goto out; |
414c70cb LG |
1459 | } |
1460 | ||
5ffbd136 MB |
1461 | rdev->open_count++; |
1462 | if (exclusive) { | |
1463 | rdev->exclusive = 1; | |
1464 | ||
1465 | ret = _regulator_is_enabled(rdev); | |
1466 | if (ret > 0) | |
1467 | rdev->use_count = 1; | |
1468 | else | |
1469 | rdev->use_count = 0; | |
1470 | } | |
1471 | ||
a5766f11 | 1472 | out: |
414c70cb | 1473 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1474 | |
414c70cb LG |
1475 | return regulator; |
1476 | } | |
5ffbd136 MB |
1477 | |
1478 | /** | |
1479 | * regulator_get - lookup and obtain a reference to a regulator. | |
1480 | * @dev: device for regulator "consumer" | |
1481 | * @id: Supply name or regulator ID. | |
1482 | * | |
1483 | * Returns a struct regulator corresponding to the regulator producer, | |
1484 | * or IS_ERR() condition containing errno. | |
1485 | * | |
1486 | * Use of supply names configured via regulator_set_device_supply() is | |
1487 | * strongly encouraged. It is recommended that the supply name used | |
1488 | * should match the name used for the supply and/or the relevant | |
1489 | * device pins in the datasheet. | |
1490 | */ | |
1491 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1492 | { | |
4ddfebd3 | 1493 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1494 | } |
414c70cb LG |
1495 | EXPORT_SYMBOL_GPL(regulator_get); |
1496 | ||
5ffbd136 MB |
1497 | /** |
1498 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1499 | * @dev: device for regulator "consumer" | |
1500 | * @id: Supply name or regulator ID. | |
1501 | * | |
1502 | * Returns a struct regulator corresponding to the regulator producer, | |
1503 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1504 | * unable to obtain this regulator while this reference is held and the |
1505 | * use count for the regulator will be initialised to reflect the current | |
1506 | * state of the regulator. | |
5ffbd136 MB |
1507 | * |
1508 | * This is intended for use by consumers which cannot tolerate shared | |
1509 | * use of the regulator such as those which need to force the | |
1510 | * regulator off for correct operation of the hardware they are | |
1511 | * controlling. | |
1512 | * | |
1513 | * Use of supply names configured via regulator_set_device_supply() is | |
1514 | * strongly encouraged. It is recommended that the supply name used | |
1515 | * should match the name used for the supply and/or the relevant | |
1516 | * device pins in the datasheet. | |
1517 | */ | |
1518 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1519 | { | |
4ddfebd3 | 1520 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1521 | } |
1522 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1523 | ||
de1dd9fd MB |
1524 | /** |
1525 | * regulator_get_optional - obtain optional access to a regulator. | |
1526 | * @dev: device for regulator "consumer" | |
1527 | * @id: Supply name or regulator ID. | |
1528 | * | |
1529 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1530 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1531 | * |
1532 | * This is intended for use by consumers for devices which can have | |
1533 | * some supplies unconnected in normal use, such as some MMC devices. | |
1534 | * It can allow the regulator core to provide stub supplies for other | |
1535 | * supplies requested using normal regulator_get() calls without | |
1536 | * disrupting the operation of drivers that can handle absent | |
1537 | * supplies. | |
1538 | * | |
1539 | * Use of supply names configured via regulator_set_device_supply() is | |
1540 | * strongly encouraged. It is recommended that the supply name used | |
1541 | * should match the name used for the supply and/or the relevant | |
1542 | * device pins in the datasheet. | |
1543 | */ | |
1544 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1545 | { | |
4ddfebd3 | 1546 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1547 | } |
1548 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1549 | ||
83b0302d | 1550 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1551 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1552 | { |
1553 | struct regulator_dev *rdev; | |
1554 | ||
1555 | if (regulator == NULL || IS_ERR(regulator)) | |
1556 | return; | |
1557 | ||
414c70cb LG |
1558 | rdev = regulator->rdev; |
1559 | ||
5de70519 | 1560 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1561 | |
414c70cb | 1562 | /* remove any sysfs entries */ |
e2c98eaf | 1563 | if (regulator->dev) |
414c70cb | 1564 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1565 | mutex_lock(&rdev->mutex); |
5de70519 | 1566 | kfree(regulator->supply_name); |
414c70cb LG |
1567 | list_del(®ulator->list); |
1568 | kfree(regulator); | |
1569 | ||
5ffbd136 MB |
1570 | rdev->open_count--; |
1571 | rdev->exclusive = 0; | |
83b0302d | 1572 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1573 | |
414c70cb | 1574 | module_put(rdev->owner); |
23ff2f0f CK |
1575 | } |
1576 | ||
1577 | /** | |
1578 | * regulator_put - "free" the regulator source | |
1579 | * @regulator: regulator source | |
1580 | * | |
1581 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1582 | * regulator source are balanced by regulator_disable calls prior to calling | |
1583 | * this function. | |
1584 | */ | |
1585 | void regulator_put(struct regulator *regulator) | |
1586 | { | |
1587 | mutex_lock(®ulator_list_mutex); | |
1588 | _regulator_put(regulator); | |
414c70cb LG |
1589 | mutex_unlock(®ulator_list_mutex); |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(regulator_put); | |
1592 | ||
a06ccd9c CK |
1593 | /** |
1594 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1595 | * | |
1596 | * @dev: device that will be given as the regulator "consumer" | |
1597 | * @id: Supply name or regulator ID | |
1598 | * @alias_dev: device that should be used to lookup the supply | |
1599 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1600 | * supply | |
1601 | * | |
1602 | * All lookups for id on dev will instead be conducted for alias_id on | |
1603 | * alias_dev. | |
1604 | */ | |
1605 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1606 | struct device *alias_dev, | |
1607 | const char *alias_id) | |
1608 | { | |
1609 | struct regulator_supply_alias *map; | |
1610 | ||
1611 | map = regulator_find_supply_alias(dev, id); | |
1612 | if (map) | |
1613 | return -EEXIST; | |
1614 | ||
1615 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1616 | if (!map) | |
1617 | return -ENOMEM; | |
1618 | ||
1619 | map->src_dev = dev; | |
1620 | map->src_supply = id; | |
1621 | map->alias_dev = alias_dev; | |
1622 | map->alias_supply = alias_id; | |
1623 | ||
1624 | list_add(&map->list, ®ulator_supply_alias_list); | |
1625 | ||
1626 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1627 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1632 | ||
1633 | /** | |
1634 | * regulator_unregister_supply_alias - Remove device alias | |
1635 | * | |
1636 | * @dev: device that will be given as the regulator "consumer" | |
1637 | * @id: Supply name or regulator ID | |
1638 | * | |
1639 | * Remove a lookup alias if one exists for id on dev. | |
1640 | */ | |
1641 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1642 | { | |
1643 | struct regulator_supply_alias *map; | |
1644 | ||
1645 | map = regulator_find_supply_alias(dev, id); | |
1646 | if (map) { | |
1647 | list_del(&map->list); | |
1648 | kfree(map); | |
1649 | } | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1652 | ||
1653 | /** | |
1654 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1655 | * | |
1656 | * @dev: device that will be given as the regulator "consumer" | |
1657 | * @id: List of supply names or regulator IDs | |
1658 | * @alias_dev: device that should be used to lookup the supply | |
1659 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1660 | * lookup the supply | |
1661 | * @num_id: Number of aliases to register | |
1662 | * | |
1663 | * @return 0 on success, an errno on failure. | |
1664 | * | |
1665 | * This helper function allows drivers to register several supply | |
1666 | * aliases in one operation. If any of the aliases cannot be | |
1667 | * registered any aliases that were registered will be removed | |
1668 | * before returning to the caller. | |
1669 | */ | |
9f8c0fe9 LJ |
1670 | int regulator_bulk_register_supply_alias(struct device *dev, |
1671 | const char *const *id, | |
a06ccd9c | 1672 | struct device *alias_dev, |
9f8c0fe9 | 1673 | const char *const *alias_id, |
a06ccd9c CK |
1674 | int num_id) |
1675 | { | |
1676 | int i; | |
1677 | int ret; | |
1678 | ||
1679 | for (i = 0; i < num_id; ++i) { | |
1680 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1681 | alias_id[i]); | |
1682 | if (ret < 0) | |
1683 | goto err; | |
1684 | } | |
1685 | ||
1686 | return 0; | |
1687 | ||
1688 | err: | |
1689 | dev_err(dev, | |
1690 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1691 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1692 | ||
1693 | while (--i >= 0) | |
1694 | regulator_unregister_supply_alias(dev, id[i]); | |
1695 | ||
1696 | return ret; | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1699 | ||
1700 | /** | |
1701 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1702 | * | |
1703 | * @dev: device that will be given as the regulator "consumer" | |
1704 | * @id: List of supply names or regulator IDs | |
1705 | * @num_id: Number of aliases to unregister | |
1706 | * | |
1707 | * This helper function allows drivers to unregister several supply | |
1708 | * aliases in one operation. | |
1709 | */ | |
1710 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1711 | const char *const *id, |
a06ccd9c CK |
1712 | int num_id) |
1713 | { | |
1714 | int i; | |
1715 | ||
1716 | for (i = 0; i < num_id; ++i) | |
1717 | regulator_unregister_supply_alias(dev, id[i]); | |
1718 | } | |
1719 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1720 | ||
1721 | ||
f19b00da KM |
1722 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1723 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1724 | const struct regulator_config *config) | |
1725 | { | |
1726 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1727 | struct gpio_desc *gpiod; |
f19b00da KM |
1728 | int ret; |
1729 | ||
778b28b4 RK |
1730 | gpiod = gpio_to_desc(config->ena_gpio); |
1731 | ||
f19b00da | 1732 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1733 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1734 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1735 | config->ena_gpio); | |
1736 | goto update_ena_gpio_to_rdev; | |
1737 | } | |
1738 | } | |
1739 | ||
1740 | ret = gpio_request_one(config->ena_gpio, | |
1741 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1742 | rdev_get_name(rdev)); | |
1743 | if (ret) | |
1744 | return ret; | |
1745 | ||
1746 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1747 | if (pin == NULL) { | |
1748 | gpio_free(config->ena_gpio); | |
1749 | return -ENOMEM; | |
1750 | } | |
1751 | ||
778b28b4 | 1752 | pin->gpiod = gpiod; |
f19b00da KM |
1753 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1754 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1755 | ||
1756 | update_ena_gpio_to_rdev: | |
1757 | pin->request_count++; | |
1758 | rdev->ena_pin = pin; | |
1759 | return 0; | |
1760 | } | |
1761 | ||
1762 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1763 | { | |
1764 | struct regulator_enable_gpio *pin, *n; | |
1765 | ||
1766 | if (!rdev->ena_pin) | |
1767 | return; | |
1768 | ||
1769 | /* Free the GPIO only in case of no use */ | |
1770 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1771 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1772 | if (pin->request_count <= 1) { |
1773 | pin->request_count = 0; | |
778b28b4 | 1774 | gpiod_put(pin->gpiod); |
f19b00da KM |
1775 | list_del(&pin->list); |
1776 | kfree(pin); | |
60a2362f SWK |
1777 | rdev->ena_pin = NULL; |
1778 | return; | |
f19b00da KM |
1779 | } else { |
1780 | pin->request_count--; | |
1781 | } | |
1782 | } | |
1783 | } | |
1784 | } | |
1785 | ||
967cfb18 | 1786 | /** |
31d6eebf RD |
1787 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1788 | * @rdev: regulator_dev structure | |
1789 | * @enable: enable GPIO at initial use? | |
1790 | * | |
967cfb18 KM |
1791 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1792 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1793 | */ | |
1794 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1795 | { | |
1796 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1797 | ||
1798 | if (!pin) | |
1799 | return -EINVAL; | |
1800 | ||
1801 | if (enable) { | |
1802 | /* Enable GPIO at initial use */ | |
1803 | if (pin->enable_count == 0) | |
778b28b4 RK |
1804 | gpiod_set_value_cansleep(pin->gpiod, |
1805 | !pin->ena_gpio_invert); | |
967cfb18 KM |
1806 | |
1807 | pin->enable_count++; | |
1808 | } else { | |
1809 | if (pin->enable_count > 1) { | |
1810 | pin->enable_count--; | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | /* Disable GPIO if not used */ | |
1815 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
1816 | gpiod_set_value_cansleep(pin->gpiod, |
1817 | pin->ena_gpio_invert); | |
967cfb18 KM |
1818 | pin->enable_count = 0; |
1819 | } | |
1820 | } | |
1821 | ||
1822 | return 0; | |
1823 | } | |
1824 | ||
79fd1141 GX |
1825 | /** |
1826 | * _regulator_enable_delay - a delay helper function | |
1827 | * @delay: time to delay in microseconds | |
1828 | * | |
1829 | * Delay for the requested amount of time as per the guidelines in: | |
1830 | * | |
1831 | * Documentation/timers/timers-howto.txt | |
1832 | * | |
1833 | * The assumption here is that regulators will never be enabled in | |
1834 | * atomic context and therefore sleeping functions can be used. | |
1835 | */ | |
1836 | static void _regulator_enable_delay(unsigned int delay) | |
1837 | { | |
1838 | unsigned int ms = delay / 1000; | |
1839 | unsigned int us = delay % 1000; | |
1840 | ||
1841 | if (ms > 0) { | |
1842 | /* | |
1843 | * For small enough values, handle super-millisecond | |
1844 | * delays in the usleep_range() call below. | |
1845 | */ | |
1846 | if (ms < 20) | |
1847 | us += ms * 1000; | |
1848 | else | |
1849 | msleep(ms); | |
1850 | } | |
1851 | ||
1852 | /* | |
1853 | * Give the scheduler some room to coalesce with any other | |
1854 | * wakeup sources. For delays shorter than 10 us, don't even | |
1855 | * bother setting up high-resolution timers and just busy- | |
1856 | * loop. | |
1857 | */ | |
1858 | if (us >= 10) | |
1859 | usleep_range(us, us + 100); | |
1860 | else | |
1861 | udelay(us); | |
1862 | } | |
1863 | ||
5c5659d0 MB |
1864 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1865 | { | |
1866 | int ret, delay; | |
1867 | ||
1868 | /* Query before enabling in case configuration dependent. */ | |
1869 | ret = _regulator_get_enable_time(rdev); | |
1870 | if (ret >= 0) { | |
1871 | delay = ret; | |
1872 | } else { | |
1873 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1874 | delay = 0; | |
1875 | } | |
1876 | ||
1877 | trace_regulator_enable(rdev_get_name(rdev)); | |
1878 | ||
871f5650 GX |
1879 | if (rdev->desc->off_on_delay) { |
1880 | /* if needed, keep a distance of off_on_delay from last time | |
1881 | * this regulator was disabled. | |
1882 | */ | |
1883 | unsigned long start_jiffy = jiffies; | |
1884 | unsigned long intended, max_delay, remaining; | |
1885 | ||
1886 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
1887 | intended = rdev->last_off_jiffy + max_delay; | |
1888 | ||
1889 | if (time_before(start_jiffy, intended)) { | |
1890 | /* calc remaining jiffies to deal with one-time | |
1891 | * timer wrapping. | |
1892 | * in case of multiple timer wrapping, either it can be | |
1893 | * detected by out-of-range remaining, or it cannot be | |
1894 | * detected and we gets a panelty of | |
1895 | * _regulator_enable_delay(). | |
1896 | */ | |
1897 | remaining = intended - start_jiffy; | |
1898 | if (remaining <= max_delay) | |
1899 | _regulator_enable_delay( | |
1900 | jiffies_to_usecs(remaining)); | |
1901 | } | |
1902 | } | |
1903 | ||
967cfb18 | 1904 | if (rdev->ena_pin) { |
29d62ec5 DA |
1905 | if (!rdev->ena_gpio_state) { |
1906 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1907 | if (ret < 0) | |
1908 | return ret; | |
1909 | rdev->ena_gpio_state = 1; | |
1910 | } | |
65f73508 | 1911 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
1912 | ret = rdev->desc->ops->enable(rdev); |
1913 | if (ret < 0) | |
1914 | return ret; | |
1915 | } else { | |
1916 | return -EINVAL; | |
1917 | } | |
1918 | ||
1919 | /* Allow the regulator to ramp; it would be useful to extend | |
1920 | * this for bulk operations so that the regulators can ramp | |
1921 | * together. */ | |
1922 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1923 | ||
79fd1141 | 1924 | _regulator_enable_delay(delay); |
5c5659d0 MB |
1925 | |
1926 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1927 | ||
1928 | return 0; | |
1929 | } | |
1930 | ||
414c70cb LG |
1931 | /* locks held by regulator_enable() */ |
1932 | static int _regulator_enable(struct regulator_dev *rdev) | |
1933 | { | |
5c5659d0 | 1934 | int ret; |
414c70cb | 1935 | |
414c70cb | 1936 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1937 | if (rdev->constraints && |
1938 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1939 | drms_uA_update(rdev); | |
414c70cb | 1940 | |
9a2372fa MB |
1941 | if (rdev->use_count == 0) { |
1942 | /* The regulator may on if it's not switchable or left on */ | |
1943 | ret = _regulator_is_enabled(rdev); | |
1944 | if (ret == -EINVAL || ret == 0) { | |
1945 | if (!_regulator_can_change_status(rdev)) | |
1946 | return -EPERM; | |
1947 | ||
5c5659d0 | 1948 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1949 | if (ret < 0) |
1950 | return ret; | |
1951 | ||
a7433cff | 1952 | } else if (ret < 0) { |
5da84fd9 | 1953 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1954 | return ret; |
1955 | } | |
a7433cff | 1956 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1957 | } |
1958 | ||
9a2372fa MB |
1959 | rdev->use_count++; |
1960 | ||
1961 | return 0; | |
414c70cb LG |
1962 | } |
1963 | ||
1964 | /** | |
1965 | * regulator_enable - enable regulator output | |
1966 | * @regulator: regulator source | |
1967 | * | |
cf7bbcdf MB |
1968 | * Request that the regulator be enabled with the regulator output at |
1969 | * the predefined voltage or current value. Calls to regulator_enable() | |
1970 | * must be balanced with calls to regulator_disable(). | |
1971 | * | |
414c70cb | 1972 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1973 | * hardwired in the regulator. |
414c70cb LG |
1974 | */ |
1975 | int regulator_enable(struct regulator *regulator) | |
1976 | { | |
412aec61 DB |
1977 | struct regulator_dev *rdev = regulator->rdev; |
1978 | int ret = 0; | |
414c70cb | 1979 | |
6492bc1b MB |
1980 | if (regulator->always_on) |
1981 | return 0; | |
1982 | ||
3801b86a MB |
1983 | if (rdev->supply) { |
1984 | ret = regulator_enable(rdev->supply); | |
1985 | if (ret != 0) | |
1986 | return ret; | |
1987 | } | |
1988 | ||
412aec61 | 1989 | mutex_lock(&rdev->mutex); |
cd94b505 | 1990 | ret = _regulator_enable(rdev); |
412aec61 | 1991 | mutex_unlock(&rdev->mutex); |
3801b86a | 1992 | |
d1685e4e | 1993 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1994 | regulator_disable(rdev->supply); |
1995 | ||
414c70cb LG |
1996 | return ret; |
1997 | } | |
1998 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1999 | ||
5c5659d0 MB |
2000 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2001 | { | |
2002 | int ret; | |
2003 | ||
2004 | trace_regulator_disable(rdev_get_name(rdev)); | |
2005 | ||
967cfb18 | 2006 | if (rdev->ena_pin) { |
29d62ec5 DA |
2007 | if (rdev->ena_gpio_state) { |
2008 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2009 | if (ret < 0) | |
2010 | return ret; | |
2011 | rdev->ena_gpio_state = 0; | |
2012 | } | |
5c5659d0 MB |
2013 | |
2014 | } else if (rdev->desc->ops->disable) { | |
2015 | ret = rdev->desc->ops->disable(rdev); | |
2016 | if (ret != 0) | |
2017 | return ret; | |
2018 | } | |
2019 | ||
871f5650 GX |
2020 | /* cares about last_off_jiffy only if off_on_delay is required by |
2021 | * device. | |
2022 | */ | |
2023 | if (rdev->desc->off_on_delay) | |
2024 | rdev->last_off_jiffy = jiffies; | |
2025 | ||
5c5659d0 MB |
2026 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2027 | ||
5c5659d0 MB |
2028 | return 0; |
2029 | } | |
2030 | ||
414c70cb | 2031 | /* locks held by regulator_disable() */ |
3801b86a | 2032 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2033 | { |
2034 | int ret = 0; | |
2035 | ||
cd94b505 | 2036 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2037 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2038 | return -EIO; |
2039 | ||
414c70cb | 2040 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2041 | if (rdev->use_count == 1 && |
2042 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2043 | |
2044 | /* we are last user */ | |
5c5659d0 | 2045 | if (_regulator_can_change_status(rdev)) { |
a1c8a551 RF |
2046 | ret = _notifier_call_chain(rdev, |
2047 | REGULATOR_EVENT_PRE_DISABLE, | |
2048 | NULL); | |
2049 | if (ret & NOTIFY_STOP_MASK) | |
2050 | return -EINVAL; | |
2051 | ||
5c5659d0 | 2052 | ret = _regulator_do_disable(rdev); |
414c70cb | 2053 | if (ret < 0) { |
5da84fd9 | 2054 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2055 | _notifier_call_chain(rdev, |
2056 | REGULATOR_EVENT_ABORT_DISABLE, | |
2057 | NULL); | |
414c70cb LG |
2058 | return ret; |
2059 | } | |
66fda75f MP |
2060 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2061 | NULL); | |
414c70cb LG |
2062 | } |
2063 | ||
414c70cb LG |
2064 | rdev->use_count = 0; |
2065 | } else if (rdev->use_count > 1) { | |
2066 | ||
2067 | if (rdev->constraints && | |
2068 | (rdev->constraints->valid_ops_mask & | |
2069 | REGULATOR_CHANGE_DRMS)) | |
2070 | drms_uA_update(rdev); | |
2071 | ||
2072 | rdev->use_count--; | |
2073 | } | |
3801b86a | 2074 | |
414c70cb LG |
2075 | return ret; |
2076 | } | |
2077 | ||
2078 | /** | |
2079 | * regulator_disable - disable regulator output | |
2080 | * @regulator: regulator source | |
2081 | * | |
cf7bbcdf MB |
2082 | * Disable the regulator output voltage or current. Calls to |
2083 | * regulator_enable() must be balanced with calls to | |
2084 | * regulator_disable(). | |
69279fb9 | 2085 | * |
414c70cb | 2086 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2087 | * devices have it enabled, the regulator device supports disabling and |
2088 | * machine constraints permit this operation. | |
414c70cb LG |
2089 | */ |
2090 | int regulator_disable(struct regulator *regulator) | |
2091 | { | |
412aec61 DB |
2092 | struct regulator_dev *rdev = regulator->rdev; |
2093 | int ret = 0; | |
414c70cb | 2094 | |
6492bc1b MB |
2095 | if (regulator->always_on) |
2096 | return 0; | |
2097 | ||
412aec61 | 2098 | mutex_lock(&rdev->mutex); |
3801b86a | 2099 | ret = _regulator_disable(rdev); |
412aec61 | 2100 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2101 | |
3801b86a MB |
2102 | if (ret == 0 && rdev->supply) |
2103 | regulator_disable(rdev->supply); | |
8cbf811d | 2104 | |
414c70cb LG |
2105 | return ret; |
2106 | } | |
2107 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2108 | ||
2109 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2110 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2111 | { |
2112 | int ret = 0; | |
2113 | ||
a1c8a551 RF |
2114 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2115 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2116 | if (ret & NOTIFY_STOP_MASK) | |
2117 | return -EINVAL; | |
2118 | ||
66fda75f MP |
2119 | ret = _regulator_do_disable(rdev); |
2120 | if (ret < 0) { | |
2121 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2122 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2123 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2124 | return ret; |
414c70cb LG |
2125 | } |
2126 | ||
66fda75f MP |
2127 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2128 | REGULATOR_EVENT_DISABLE, NULL); | |
2129 | ||
2130 | return 0; | |
414c70cb LG |
2131 | } |
2132 | ||
2133 | /** | |
2134 | * regulator_force_disable - force disable regulator output | |
2135 | * @regulator: regulator source | |
2136 | * | |
2137 | * Forcibly disable the regulator output voltage or current. | |
2138 | * NOTE: this *will* disable the regulator output even if other consumer | |
2139 | * devices have it enabled. This should be used for situations when device | |
2140 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2141 | */ | |
2142 | int regulator_force_disable(struct regulator *regulator) | |
2143 | { | |
82d15839 | 2144 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2145 | int ret; |
2146 | ||
82d15839 | 2147 | mutex_lock(&rdev->mutex); |
414c70cb | 2148 | regulator->uA_load = 0; |
3801b86a | 2149 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2150 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2151 | |
3801b86a MB |
2152 | if (rdev->supply) |
2153 | while (rdev->open_count--) | |
2154 | regulator_disable(rdev->supply); | |
8cbf811d | 2155 | |
414c70cb LG |
2156 | return ret; |
2157 | } | |
2158 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2159 | ||
da07ecd9 MB |
2160 | static void regulator_disable_work(struct work_struct *work) |
2161 | { | |
2162 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2163 | disable_work.work); | |
2164 | int count, i, ret; | |
2165 | ||
2166 | mutex_lock(&rdev->mutex); | |
2167 | ||
2168 | BUG_ON(!rdev->deferred_disables); | |
2169 | ||
2170 | count = rdev->deferred_disables; | |
2171 | rdev->deferred_disables = 0; | |
2172 | ||
2173 | for (i = 0; i < count; i++) { | |
2174 | ret = _regulator_disable(rdev); | |
2175 | if (ret != 0) | |
2176 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2177 | } | |
2178 | ||
2179 | mutex_unlock(&rdev->mutex); | |
2180 | ||
2181 | if (rdev->supply) { | |
2182 | for (i = 0; i < count; i++) { | |
2183 | ret = regulator_disable(rdev->supply); | |
2184 | if (ret != 0) { | |
2185 | rdev_err(rdev, | |
2186 | "Supply disable failed: %d\n", ret); | |
2187 | } | |
2188 | } | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | /** | |
2193 | * regulator_disable_deferred - disable regulator output with delay | |
2194 | * @regulator: regulator source | |
2195 | * @ms: miliseconds until the regulator is disabled | |
2196 | * | |
2197 | * Execute regulator_disable() on the regulator after a delay. This | |
2198 | * is intended for use with devices that require some time to quiesce. | |
2199 | * | |
2200 | * NOTE: this will only disable the regulator output if no other consumer | |
2201 | * devices have it enabled, the regulator device supports disabling and | |
2202 | * machine constraints permit this operation. | |
2203 | */ | |
2204 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2205 | { | |
2206 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 2207 | int ret; |
da07ecd9 | 2208 | |
6492bc1b MB |
2209 | if (regulator->always_on) |
2210 | return 0; | |
2211 | ||
2b5a24a0 MB |
2212 | if (!ms) |
2213 | return regulator_disable(regulator); | |
2214 | ||
da07ecd9 MB |
2215 | mutex_lock(&rdev->mutex); |
2216 | rdev->deferred_disables++; | |
2217 | mutex_unlock(&rdev->mutex); | |
2218 | ||
070260f0 MB |
2219 | ret = queue_delayed_work(system_power_efficient_wq, |
2220 | &rdev->disable_work, | |
2221 | msecs_to_jiffies(ms)); | |
aa59802d MB |
2222 | if (ret < 0) |
2223 | return ret; | |
2224 | else | |
2225 | return 0; | |
da07ecd9 MB |
2226 | } |
2227 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2228 | ||
414c70cb LG |
2229 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2230 | { | |
65f73508 | 2231 | /* A GPIO control always takes precedence */ |
7b74d149 | 2232 | if (rdev->ena_pin) |
65f73508 MB |
2233 | return rdev->ena_gpio_state; |
2234 | ||
9a7f6a4c | 2235 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2236 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2237 | return 1; |
414c70cb | 2238 | |
9332546f | 2239 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2240 | } |
2241 | ||
2242 | /** | |
2243 | * regulator_is_enabled - is the regulator output enabled | |
2244 | * @regulator: regulator source | |
2245 | * | |
412aec61 DB |
2246 | * Returns positive if the regulator driver backing the source/client |
2247 | * has requested that the device be enabled, zero if it hasn't, else a | |
2248 | * negative errno code. | |
2249 | * | |
2250 | * Note that the device backing this regulator handle can have multiple | |
2251 | * users, so it might be enabled even if regulator_enable() was never | |
2252 | * called for this particular source. | |
414c70cb LG |
2253 | */ |
2254 | int regulator_is_enabled(struct regulator *regulator) | |
2255 | { | |
9332546f MB |
2256 | int ret; |
2257 | ||
6492bc1b MB |
2258 | if (regulator->always_on) |
2259 | return 1; | |
2260 | ||
9332546f MB |
2261 | mutex_lock(®ulator->rdev->mutex); |
2262 | ret = _regulator_is_enabled(regulator->rdev); | |
2263 | mutex_unlock(®ulator->rdev->mutex); | |
2264 | ||
2265 | return ret; | |
414c70cb LG |
2266 | } |
2267 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2268 | ||
d1e7de30 MS |
2269 | /** |
2270 | * regulator_can_change_voltage - check if regulator can change voltage | |
2271 | * @regulator: regulator source | |
2272 | * | |
2273 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2274 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2275 | * or dummy regulators and disabling voltage change logic in the client |
2276 | * driver. | |
2277 | */ | |
2278 | int regulator_can_change_voltage(struct regulator *regulator) | |
2279 | { | |
2280 | struct regulator_dev *rdev = regulator->rdev; | |
2281 | ||
2282 | if (rdev->constraints && | |
19280e40 AL |
2283 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2284 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2285 | return 1; | |
2286 | ||
2287 | if (rdev->desc->continuous_voltage_range && | |
2288 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2289 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2290 | return 1; | |
2291 | } | |
d1e7de30 MS |
2292 | |
2293 | return 0; | |
2294 | } | |
2295 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2296 | ||
4367cfdc DB |
2297 | /** |
2298 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2299 | * @regulator: regulator source | |
2300 | * | |
2301 | * Returns number of selectors, or negative errno. Selectors are | |
2302 | * numbered starting at zero, and typically correspond to bitfields | |
2303 | * in hardware registers. | |
2304 | */ | |
2305 | int regulator_count_voltages(struct regulator *regulator) | |
2306 | { | |
2307 | struct regulator_dev *rdev = regulator->rdev; | |
2308 | ||
26988efe JMC |
2309 | if (rdev->desc->n_voltages) |
2310 | return rdev->desc->n_voltages; | |
2311 | ||
2312 | if (!rdev->supply) | |
2313 | return -EINVAL; | |
2314 | ||
2315 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2316 | } |
2317 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2318 | ||
2319 | /** | |
2320 | * regulator_list_voltage - enumerate supported voltages | |
2321 | * @regulator: regulator source | |
2322 | * @selector: identify voltage to list | |
2323 | * Context: can sleep | |
2324 | * | |
2325 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2326 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2327 | * negative errno. |
2328 | */ | |
2329 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2330 | { | |
272e2315 GX |
2331 | struct regulator_dev *rdev = regulator->rdev; |
2332 | const struct regulator_ops *ops = rdev->desc->ops; | |
2333 | int ret; | |
4367cfdc | 2334 | |
f446043f GL |
2335 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) |
2336 | return rdev->desc->fixed_uV; | |
2337 | ||
26988efe JMC |
2338 | if (ops->list_voltage) { |
2339 | if (selector >= rdev->desc->n_voltages) | |
2340 | return -EINVAL; | |
2341 | mutex_lock(&rdev->mutex); | |
2342 | ret = ops->list_voltage(rdev, selector); | |
2343 | mutex_unlock(&rdev->mutex); | |
2344 | } else if (rdev->supply) { | |
2345 | ret = regulator_list_voltage(rdev->supply, selector); | |
2346 | } else { | |
4367cfdc | 2347 | return -EINVAL; |
26988efe | 2348 | } |
4367cfdc DB |
2349 | |
2350 | if (ret > 0) { | |
2351 | if (ret < rdev->constraints->min_uV) | |
2352 | ret = 0; | |
2353 | else if (ret > rdev->constraints->max_uV) | |
2354 | ret = 0; | |
2355 | } | |
2356 | ||
2357 | return ret; | |
2358 | } | |
2359 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2360 | ||
04eca28c TT |
2361 | /** |
2362 | * regulator_get_regmap - get the regulator's register map | |
2363 | * @regulator: regulator source | |
2364 | * | |
2365 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2366 | * if the regulator doesn't use regmap. | |
2367 | */ | |
2368 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2369 | { | |
2370 | struct regmap *map = regulator->rdev->regmap; | |
2371 | ||
2372 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2373 | } | |
2374 | ||
2375 | /** | |
2376 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2377 | * @regulator: regulator source | |
2378 | * @vsel_reg: voltage selector register, output parameter | |
2379 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2380 | * | |
2381 | * Returns the hardware register offset and bitmask used for setting the | |
2382 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2383 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2384 | * for example. | |
2385 | * | |
2386 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2387 | * and 0 is returned, otherwise a negative errno is returned. | |
2388 | */ | |
2389 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2390 | unsigned *vsel_reg, | |
2391 | unsigned *vsel_mask) | |
2392 | { | |
39f5460d GX |
2393 | struct regulator_dev *rdev = regulator->rdev; |
2394 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2395 | |
2396 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2397 | return -EOPNOTSUPP; | |
2398 | ||
2399 | *vsel_reg = rdev->desc->vsel_reg; | |
2400 | *vsel_mask = rdev->desc->vsel_mask; | |
2401 | ||
2402 | return 0; | |
2403 | } | |
2404 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2405 | ||
2406 | /** | |
2407 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2408 | * @regulator: regulator source | |
2409 | * @selector: identify voltage to list | |
2410 | * | |
2411 | * Converts the selector to a hardware-specific voltage selector that can be | |
2412 | * directly written to the regulator registers. The address of the voltage | |
2413 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2414 | * | |
2415 | * On error a negative errno is returned. | |
2416 | */ | |
2417 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2418 | unsigned selector) | |
2419 | { | |
39f5460d GX |
2420 | struct regulator_dev *rdev = regulator->rdev; |
2421 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2422 | |
2423 | if (selector >= rdev->desc->n_voltages) | |
2424 | return -EINVAL; | |
2425 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2426 | return -EOPNOTSUPP; | |
2427 | ||
2428 | return selector; | |
2429 | } | |
2430 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2431 | ||
2a668a8b PW |
2432 | /** |
2433 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2434 | * @regulator: regulator source | |
2435 | * | |
2436 | * Returns the voltage step size between VSEL values for linear | |
2437 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2438 | */ | |
2439 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2440 | { | |
2441 | struct regulator_dev *rdev = regulator->rdev; | |
2442 | ||
2443 | return rdev->desc->uV_step; | |
2444 | } | |
2445 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2446 | ||
a7a1ad90 MB |
2447 | /** |
2448 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2449 | * | |
2450 | * @regulator: Regulator to check. | |
2451 | * @min_uV: Minimum required voltage in uV. | |
2452 | * @max_uV: Maximum required voltage in uV. | |
2453 | * | |
2454 | * Returns a boolean or a negative error code. | |
2455 | */ | |
2456 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2457 | int min_uV, int max_uV) | |
2458 | { | |
c5f3939b | 2459 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2460 | int i, voltages, ret; |
2461 | ||
c5f3939b MB |
2462 | /* If we can't change voltage check the current voltage */ |
2463 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2464 | ret = regulator_get_voltage(regulator); | |
2465 | if (ret >= 0) | |
0d25d09d | 2466 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2467 | else |
2468 | return ret; | |
2469 | } | |
2470 | ||
bd7a2b60 PM |
2471 | /* Any voltage within constrains range is fine? */ |
2472 | if (rdev->desc->continuous_voltage_range) | |
2473 | return min_uV >= rdev->constraints->min_uV && | |
2474 | max_uV <= rdev->constraints->max_uV; | |
2475 | ||
a7a1ad90 MB |
2476 | ret = regulator_count_voltages(regulator); |
2477 | if (ret < 0) | |
2478 | return ret; | |
2479 | voltages = ret; | |
2480 | ||
2481 | for (i = 0; i < voltages; i++) { | |
2482 | ret = regulator_list_voltage(regulator, i); | |
2483 | ||
2484 | if (ret >= min_uV && ret <= max_uV) | |
2485 | return 1; | |
2486 | } | |
2487 | ||
2488 | return 0; | |
2489 | } | |
a398eaa2 | 2490 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2491 | |
7179569a HS |
2492 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2493 | int min_uV, int max_uV, | |
2494 | unsigned *selector) | |
2495 | { | |
2496 | struct pre_voltage_change_data data; | |
2497 | int ret; | |
2498 | ||
2499 | data.old_uV = _regulator_get_voltage(rdev); | |
2500 | data.min_uV = min_uV; | |
2501 | data.max_uV = max_uV; | |
2502 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2503 | &data); | |
2504 | if (ret & NOTIFY_STOP_MASK) | |
2505 | return -EINVAL; | |
2506 | ||
2507 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2508 | if (ret >= 0) | |
2509 | return ret; | |
2510 | ||
2511 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2512 | (void *)data.old_uV); | |
2513 | ||
2514 | return ret; | |
2515 | } | |
2516 | ||
2517 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2518 | int uV, unsigned selector) | |
2519 | { | |
2520 | struct pre_voltage_change_data data; | |
2521 | int ret; | |
2522 | ||
2523 | data.old_uV = _regulator_get_voltage(rdev); | |
2524 | data.min_uV = uV; | |
2525 | data.max_uV = uV; | |
2526 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2527 | &data); | |
2528 | if (ret & NOTIFY_STOP_MASK) | |
2529 | return -EINVAL; | |
2530 | ||
2531 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2532 | if (ret >= 0) | |
2533 | return ret; | |
2534 | ||
2535 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2536 | (void *)data.old_uV); | |
2537 | ||
2538 | return ret; | |
2539 | } | |
2540 | ||
75790251 MB |
2541 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2542 | int min_uV, int max_uV) | |
2543 | { | |
2544 | int ret; | |
77af1b26 | 2545 | int delay = 0; |
e113d792 | 2546 | int best_val = 0; |
75790251 | 2547 | unsigned int selector; |
eba41a5e | 2548 | int old_selector = -1; |
75790251 MB |
2549 | |
2550 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2551 | ||
bf5892a8 MB |
2552 | min_uV += rdev->constraints->uV_offset; |
2553 | max_uV += rdev->constraints->uV_offset; | |
2554 | ||
eba41a5e AL |
2555 | /* |
2556 | * If we can't obtain the old selector there is not enough | |
2557 | * info to call set_voltage_time_sel(). | |
2558 | */ | |
8b7485ef AL |
2559 | if (_regulator_is_enabled(rdev) && |
2560 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2561 | rdev->desc->ops->get_voltage_sel) { |
2562 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2563 | if (old_selector < 0) | |
2564 | return old_selector; | |
2565 | } | |
2566 | ||
75790251 | 2567 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2568 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2569 | &selector); | |
e113d792 MB |
2570 | |
2571 | if (ret >= 0) { | |
2572 | if (rdev->desc->ops->list_voltage) | |
2573 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2574 | selector); | |
2575 | else | |
2576 | best_val = _regulator_get_voltage(rdev); | |
2577 | } | |
2578 | ||
e8eef82b | 2579 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2580 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2581 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2582 | max_uV); | |
9152c36a AL |
2583 | } else { |
2584 | if (rdev->desc->ops->list_voltage == | |
2585 | regulator_list_voltage_linear) | |
2586 | ret = regulator_map_voltage_linear(rdev, | |
2587 | min_uV, max_uV); | |
36698627 AL |
2588 | else if (rdev->desc->ops->list_voltage == |
2589 | regulator_list_voltage_linear_range) | |
2590 | ret = regulator_map_voltage_linear_range(rdev, | |
2591 | min_uV, max_uV); | |
9152c36a AL |
2592 | else |
2593 | ret = regulator_map_voltage_iterate(rdev, | |
2594 | min_uV, max_uV); | |
2595 | } | |
e8eef82b | 2596 | |
e843fc46 | 2597 | if (ret >= 0) { |
e113d792 MB |
2598 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2599 | if (min_uV <= best_val && max_uV >= best_val) { | |
2600 | selector = ret; | |
c66a566a AL |
2601 | if (old_selector == selector) |
2602 | ret = 0; | |
2603 | else | |
7179569a HS |
2604 | ret = _regulator_call_set_voltage_sel( |
2605 | rdev, best_val, selector); | |
e113d792 MB |
2606 | } else { |
2607 | ret = -EINVAL; | |
2608 | } | |
e8eef82b | 2609 | } |
75790251 MB |
2610 | } else { |
2611 | ret = -EINVAL; | |
2612 | } | |
e8eef82b | 2613 | |
eba41a5e | 2614 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2615 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2616 | && old_selector != selector) { | |
77af1b26 | 2617 | |
eba41a5e AL |
2618 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2619 | old_selector, selector); | |
2620 | if (delay < 0) { | |
2621 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2622 | delay); | |
2623 | delay = 0; | |
e8eef82b | 2624 | } |
75790251 | 2625 | |
8b96de31 PR |
2626 | /* Insert any necessary delays */ |
2627 | if (delay >= 1000) { | |
2628 | mdelay(delay / 1000); | |
2629 | udelay(delay % 1000); | |
2630 | } else if (delay) { | |
2631 | udelay(delay); | |
2632 | } | |
77af1b26 LW |
2633 | } |
2634 | ||
2f6c797f AL |
2635 | if (ret == 0 && best_val >= 0) { |
2636 | unsigned long data = best_val; | |
2637 | ||
ded06a52 | 2638 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2639 | (void *)data); |
2640 | } | |
ded06a52 | 2641 | |
eba41a5e | 2642 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2643 | |
2644 | return ret; | |
2645 | } | |
2646 | ||
414c70cb LG |
2647 | /** |
2648 | * regulator_set_voltage - set regulator output voltage | |
2649 | * @regulator: regulator source | |
2650 | * @min_uV: Minimum required voltage in uV | |
2651 | * @max_uV: Maximum acceptable voltage in uV | |
2652 | * | |
2653 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2654 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2655 | * | |
2656 | * If the regulator is enabled then the voltage will change to the new value | |
2657 | * immediately otherwise if the regulator is disabled the regulator will | |
2658 | * output at the new voltage when enabled. | |
2659 | * | |
2660 | * NOTE: If the regulator is shared between several devices then the lowest | |
2661 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2662 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2663 | * calling this function otherwise this call will fail. |
2664 | */ | |
2665 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2666 | { | |
2667 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2668 | int ret = 0; |
92d7a558 | 2669 | int old_min_uV, old_max_uV; |
c00dc359 | 2670 | int current_uV; |
414c70cb LG |
2671 | |
2672 | mutex_lock(&rdev->mutex); | |
2673 | ||
95a3c23a MB |
2674 | /* If we're setting the same range as last time the change |
2675 | * should be a noop (some cpufreq implementations use the same | |
2676 | * voltage for multiple frequencies, for example). | |
2677 | */ | |
2678 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2679 | goto out; | |
2680 | ||
c00dc359 BA |
2681 | /* If we're trying to set a range that overlaps the current voltage, |
2682 | * return succesfully even though the regulator does not support | |
2683 | * changing the voltage. | |
2684 | */ | |
2685 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2686 | current_uV = _regulator_get_voltage(rdev); | |
2687 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2688 | regulator->min_uV = min_uV; | |
2689 | regulator->max_uV = max_uV; | |
2690 | goto out; | |
2691 | } | |
2692 | } | |
2693 | ||
414c70cb | 2694 | /* sanity check */ |
e8eef82b MB |
2695 | if (!rdev->desc->ops->set_voltage && |
2696 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2697 | ret = -EINVAL; |
2698 | goto out; | |
2699 | } | |
2700 | ||
2701 | /* constraints check */ | |
2702 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2703 | if (ret < 0) | |
2704 | goto out; | |
0d25d09d | 2705 | |
92d7a558 PP |
2706 | /* restore original values in case of error */ |
2707 | old_min_uV = regulator->min_uV; | |
2708 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2709 | regulator->min_uV = min_uV; |
2710 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2711 | |
05fda3b1 TP |
2712 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2713 | if (ret < 0) | |
92d7a558 | 2714 | goto out2; |
05fda3b1 | 2715 | |
75790251 | 2716 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2717 | if (ret < 0) |
2718 | goto out2; | |
0d25d09d | 2719 | |
414c70cb LG |
2720 | out: |
2721 | mutex_unlock(&rdev->mutex); | |
2722 | return ret; | |
92d7a558 PP |
2723 | out2: |
2724 | regulator->min_uV = old_min_uV; | |
2725 | regulator->max_uV = old_max_uV; | |
2726 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2727 | return ret; |
2728 | } | |
2729 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2730 | ||
88cd222b LW |
2731 | /** |
2732 | * regulator_set_voltage_time - get raise/fall time | |
2733 | * @regulator: regulator source | |
2734 | * @old_uV: starting voltage in microvolts | |
2735 | * @new_uV: target voltage in microvolts | |
2736 | * | |
2737 | * Provided with the starting and ending voltage, this function attempts to | |
2738 | * calculate the time in microseconds required to rise or fall to this new | |
2739 | * voltage. | |
2740 | */ | |
2741 | int regulator_set_voltage_time(struct regulator *regulator, | |
2742 | int old_uV, int new_uV) | |
2743 | { | |
272e2315 GX |
2744 | struct regulator_dev *rdev = regulator->rdev; |
2745 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
2746 | int old_sel = -1; |
2747 | int new_sel = -1; | |
2748 | int voltage; | |
2749 | int i; | |
2750 | ||
2751 | /* Currently requires operations to do this */ | |
2752 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2753 | || !rdev->desc->n_voltages) | |
2754 | return -EINVAL; | |
2755 | ||
2756 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2757 | /* We only look for exact voltage matches here */ | |
2758 | voltage = regulator_list_voltage(regulator, i); | |
2759 | if (voltage < 0) | |
2760 | return -EINVAL; | |
2761 | if (voltage == 0) | |
2762 | continue; | |
2763 | if (voltage == old_uV) | |
2764 | old_sel = i; | |
2765 | if (voltage == new_uV) | |
2766 | new_sel = i; | |
2767 | } | |
2768 | ||
2769 | if (old_sel < 0 || new_sel < 0) | |
2770 | return -EINVAL; | |
2771 | ||
2772 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2773 | } | |
2774 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2775 | ||
98a175b6 | 2776 | /** |
296c6566 RD |
2777 | * regulator_set_voltage_time_sel - get raise/fall time |
2778 | * @rdev: regulator source device | |
98a175b6 YSB |
2779 | * @old_selector: selector for starting voltage |
2780 | * @new_selector: selector for target voltage | |
2781 | * | |
2782 | * Provided with the starting and target voltage selectors, this function | |
2783 | * returns time in microseconds required to rise or fall to this new voltage | |
2784 | * | |
f11d08c3 | 2785 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2786 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2787 | */ |
2788 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2789 | unsigned int old_selector, | |
2790 | unsigned int new_selector) | |
2791 | { | |
398715ab | 2792 | unsigned int ramp_delay = 0; |
f11d08c3 | 2793 | int old_volt, new_volt; |
398715ab AL |
2794 | |
2795 | if (rdev->constraints->ramp_delay) | |
2796 | ramp_delay = rdev->constraints->ramp_delay; | |
2797 | else if (rdev->desc->ramp_delay) | |
2798 | ramp_delay = rdev->desc->ramp_delay; | |
2799 | ||
2800 | if (ramp_delay == 0) { | |
6f0b2c69 | 2801 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2802 | return 0; |
6f0b2c69 | 2803 | } |
398715ab | 2804 | |
f11d08c3 AL |
2805 | /* sanity check */ |
2806 | if (!rdev->desc->ops->list_voltage) | |
2807 | return -EINVAL; | |
398715ab | 2808 | |
f11d08c3 AL |
2809 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2810 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2811 | ||
2812 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2813 | } |
b19dbf71 | 2814 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2815 | |
606a2562 MB |
2816 | /** |
2817 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2818 | * @regulator: regulator source | |
2819 | * | |
2820 | * Re-apply the last configured voltage. This is intended to be used | |
2821 | * where some external control source the consumer is cooperating with | |
2822 | * has caused the configured voltage to change. | |
2823 | */ | |
2824 | int regulator_sync_voltage(struct regulator *regulator) | |
2825 | { | |
2826 | struct regulator_dev *rdev = regulator->rdev; | |
2827 | int ret, min_uV, max_uV; | |
2828 | ||
2829 | mutex_lock(&rdev->mutex); | |
2830 | ||
2831 | if (!rdev->desc->ops->set_voltage && | |
2832 | !rdev->desc->ops->set_voltage_sel) { | |
2833 | ret = -EINVAL; | |
2834 | goto out; | |
2835 | } | |
2836 | ||
2837 | /* This is only going to work if we've had a voltage configured. */ | |
2838 | if (!regulator->min_uV && !regulator->max_uV) { | |
2839 | ret = -EINVAL; | |
2840 | goto out; | |
2841 | } | |
2842 | ||
2843 | min_uV = regulator->min_uV; | |
2844 | max_uV = regulator->max_uV; | |
2845 | ||
2846 | /* This should be a paranoia check... */ | |
2847 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2848 | if (ret < 0) | |
2849 | goto out; | |
2850 | ||
2851 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2852 | if (ret < 0) | |
2853 | goto out; | |
2854 | ||
2855 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2856 | ||
2857 | out: | |
2858 | mutex_unlock(&rdev->mutex); | |
2859 | return ret; | |
2860 | } | |
2861 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2862 | ||
414c70cb LG |
2863 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2864 | { | |
bf5892a8 | 2865 | int sel, ret; |
476c2d83 MB |
2866 | |
2867 | if (rdev->desc->ops->get_voltage_sel) { | |
2868 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2869 | if (sel < 0) | |
2870 | return sel; | |
bf5892a8 | 2871 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2872 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2873 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2874 | } else if (rdev->desc->ops->list_voltage) { |
2875 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
2876 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
2877 | ret = rdev->desc->fixed_uV; | |
e303996e JMC |
2878 | } else if (rdev->supply) { |
2879 | ret = regulator_get_voltage(rdev->supply); | |
cb220d16 | 2880 | } else { |
414c70cb | 2881 | return -EINVAL; |
cb220d16 | 2882 | } |
bf5892a8 | 2883 | |
cb220d16 AL |
2884 | if (ret < 0) |
2885 | return ret; | |
bf5892a8 | 2886 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2887 | } |
2888 | ||
2889 | /** | |
2890 | * regulator_get_voltage - get regulator output voltage | |
2891 | * @regulator: regulator source | |
2892 | * | |
2893 | * This returns the current regulator voltage in uV. | |
2894 | * | |
2895 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2896 | * function should not be used to determine regulator state. | |
2897 | */ | |
2898 | int regulator_get_voltage(struct regulator *regulator) | |
2899 | { | |
2900 | int ret; | |
2901 | ||
2902 | mutex_lock(®ulator->rdev->mutex); | |
2903 | ||
2904 | ret = _regulator_get_voltage(regulator->rdev); | |
2905 | ||
2906 | mutex_unlock(®ulator->rdev->mutex); | |
2907 | ||
2908 | return ret; | |
2909 | } | |
2910 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2911 | ||
2912 | /** | |
2913 | * regulator_set_current_limit - set regulator output current limit | |
2914 | * @regulator: regulator source | |
ce0d10f8 | 2915 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2916 | * @max_uA: Maximum supported current in uA |
2917 | * | |
2918 | * Sets current sink to the desired output current. This can be set during | |
2919 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2920 | * | |
2921 | * If the regulator is enabled then the current will change to the new value | |
2922 | * immediately otherwise if the regulator is disabled the regulator will | |
2923 | * output at the new current when enabled. | |
2924 | * | |
2925 | * NOTE: Regulator system constraints must be set for this regulator before | |
2926 | * calling this function otherwise this call will fail. | |
2927 | */ | |
2928 | int regulator_set_current_limit(struct regulator *regulator, | |
2929 | int min_uA, int max_uA) | |
2930 | { | |
2931 | struct regulator_dev *rdev = regulator->rdev; | |
2932 | int ret; | |
2933 | ||
2934 | mutex_lock(&rdev->mutex); | |
2935 | ||
2936 | /* sanity check */ | |
2937 | if (!rdev->desc->ops->set_current_limit) { | |
2938 | ret = -EINVAL; | |
2939 | goto out; | |
2940 | } | |
2941 | ||
2942 | /* constraints check */ | |
2943 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2944 | if (ret < 0) | |
2945 | goto out; | |
2946 | ||
2947 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2948 | out: | |
2949 | mutex_unlock(&rdev->mutex); | |
2950 | return ret; | |
2951 | } | |
2952 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2953 | ||
2954 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2955 | { | |
2956 | int ret; | |
2957 | ||
2958 | mutex_lock(&rdev->mutex); | |
2959 | ||
2960 | /* sanity check */ | |
2961 | if (!rdev->desc->ops->get_current_limit) { | |
2962 | ret = -EINVAL; | |
2963 | goto out; | |
2964 | } | |
2965 | ||
2966 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2967 | out: | |
2968 | mutex_unlock(&rdev->mutex); | |
2969 | return ret; | |
2970 | } | |
2971 | ||
2972 | /** | |
2973 | * regulator_get_current_limit - get regulator output current | |
2974 | * @regulator: regulator source | |
2975 | * | |
2976 | * This returns the current supplied by the specified current sink in uA. | |
2977 | * | |
2978 | * NOTE: If the regulator is disabled it will return the current value. This | |
2979 | * function should not be used to determine regulator state. | |
2980 | */ | |
2981 | int regulator_get_current_limit(struct regulator *regulator) | |
2982 | { | |
2983 | return _regulator_get_current_limit(regulator->rdev); | |
2984 | } | |
2985 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2986 | ||
2987 | /** | |
2988 | * regulator_set_mode - set regulator operating mode | |
2989 | * @regulator: regulator source | |
2990 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2991 | * | |
2992 | * Set regulator operating mode to increase regulator efficiency or improve | |
2993 | * regulation performance. | |
2994 | * | |
2995 | * NOTE: Regulator system constraints must be set for this regulator before | |
2996 | * calling this function otherwise this call will fail. | |
2997 | */ | |
2998 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2999 | { | |
3000 | struct regulator_dev *rdev = regulator->rdev; | |
3001 | int ret; | |
500b4ac9 | 3002 | int regulator_curr_mode; |
414c70cb LG |
3003 | |
3004 | mutex_lock(&rdev->mutex); | |
3005 | ||
3006 | /* sanity check */ | |
3007 | if (!rdev->desc->ops->set_mode) { | |
3008 | ret = -EINVAL; | |
3009 | goto out; | |
3010 | } | |
3011 | ||
500b4ac9 SI |
3012 | /* return if the same mode is requested */ |
3013 | if (rdev->desc->ops->get_mode) { | |
3014 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3015 | if (regulator_curr_mode == mode) { | |
3016 | ret = 0; | |
3017 | goto out; | |
3018 | } | |
3019 | } | |
3020 | ||
414c70cb | 3021 | /* constraints check */ |
22c51b47 | 3022 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3023 | if (ret < 0) |
3024 | goto out; | |
3025 | ||
3026 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3027 | out: | |
3028 | mutex_unlock(&rdev->mutex); | |
3029 | return ret; | |
3030 | } | |
3031 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3032 | ||
3033 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3034 | { | |
3035 | int ret; | |
3036 | ||
3037 | mutex_lock(&rdev->mutex); | |
3038 | ||
3039 | /* sanity check */ | |
3040 | if (!rdev->desc->ops->get_mode) { | |
3041 | ret = -EINVAL; | |
3042 | goto out; | |
3043 | } | |
3044 | ||
3045 | ret = rdev->desc->ops->get_mode(rdev); | |
3046 | out: | |
3047 | mutex_unlock(&rdev->mutex); | |
3048 | return ret; | |
3049 | } | |
3050 | ||
3051 | /** | |
3052 | * regulator_get_mode - get regulator operating mode | |
3053 | * @regulator: regulator source | |
3054 | * | |
3055 | * Get the current regulator operating mode. | |
3056 | */ | |
3057 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3058 | { | |
3059 | return _regulator_get_mode(regulator->rdev); | |
3060 | } | |
3061 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3062 | ||
3063 | /** | |
e39ce48f | 3064 | * regulator_set_load - set regulator load |
414c70cb LG |
3065 | * @regulator: regulator source |
3066 | * @uA_load: load current | |
3067 | * | |
3068 | * Notifies the regulator core of a new device load. This is then used by | |
3069 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3070 | * operating mode for the new regulator loading. | |
3071 | * | |
3072 | * Consumer devices notify their supply regulator of the maximum power | |
3073 | * they will require (can be taken from device datasheet in the power | |
3074 | * consumption tables) when they change operational status and hence power | |
3075 | * state. Examples of operational state changes that can affect power | |
3076 | * consumption are :- | |
3077 | * | |
3078 | * o Device is opened / closed. | |
3079 | * o Device I/O is about to begin or has just finished. | |
3080 | * o Device is idling in between work. | |
3081 | * | |
3082 | * This information is also exported via sysfs to userspace. | |
3083 | * | |
3084 | * DRMS will sum the total requested load on the regulator and change | |
3085 | * to the most efficient operating mode if platform constraints allow. | |
3086 | * | |
e39ce48f | 3087 | * On error a negative errno is returned. |
414c70cb | 3088 | */ |
e39ce48f | 3089 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3090 | { |
3091 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3092 | int ret; |
d92d95b6 | 3093 | |
414c70cb | 3094 | mutex_lock(&rdev->mutex); |
414c70cb | 3095 | regulator->uA_load = uA_load; |
8460ef38 | 3096 | ret = drms_uA_update(rdev); |
414c70cb | 3097 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3098 | |
414c70cb LG |
3099 | return ret; |
3100 | } | |
e39ce48f | 3101 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3102 | |
f59c8f9f MB |
3103 | /** |
3104 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3105 | * | |
3106 | * @regulator: Regulator to configure | |
9345dfb8 | 3107 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3108 | * |
3109 | * Allow the regulator to go into bypass mode if all other consumers | |
3110 | * for the regulator also enable bypass mode and the machine | |
3111 | * constraints allow this. Bypass mode means that the regulator is | |
3112 | * simply passing the input directly to the output with no regulation. | |
3113 | */ | |
3114 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3115 | { | |
3116 | struct regulator_dev *rdev = regulator->rdev; | |
3117 | int ret = 0; | |
3118 | ||
3119 | if (!rdev->desc->ops->set_bypass) | |
3120 | return 0; | |
3121 | ||
3122 | if (rdev->constraints && | |
3123 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
3124 | return 0; | |
3125 | ||
3126 | mutex_lock(&rdev->mutex); | |
3127 | ||
3128 | if (enable && !regulator->bypass) { | |
3129 | rdev->bypass_count++; | |
3130 | ||
3131 | if (rdev->bypass_count == rdev->open_count) { | |
3132 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3133 | if (ret != 0) | |
3134 | rdev->bypass_count--; | |
3135 | } | |
3136 | ||
3137 | } else if (!enable && regulator->bypass) { | |
3138 | rdev->bypass_count--; | |
3139 | ||
3140 | if (rdev->bypass_count != rdev->open_count) { | |
3141 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3142 | if (ret != 0) | |
3143 | rdev->bypass_count++; | |
3144 | } | |
3145 | } | |
3146 | ||
3147 | if (ret == 0) | |
3148 | regulator->bypass = enable; | |
3149 | ||
3150 | mutex_unlock(&rdev->mutex); | |
3151 | ||
3152 | return ret; | |
3153 | } | |
3154 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3155 | ||
414c70cb LG |
3156 | /** |
3157 | * regulator_register_notifier - register regulator event notifier | |
3158 | * @regulator: regulator source | |
69279fb9 | 3159 | * @nb: notifier block |
414c70cb LG |
3160 | * |
3161 | * Register notifier block to receive regulator events. | |
3162 | */ | |
3163 | int regulator_register_notifier(struct regulator *regulator, | |
3164 | struct notifier_block *nb) | |
3165 | { | |
3166 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3167 | nb); | |
3168 | } | |
3169 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3170 | ||
3171 | /** | |
3172 | * regulator_unregister_notifier - unregister regulator event notifier | |
3173 | * @regulator: regulator source | |
69279fb9 | 3174 | * @nb: notifier block |
414c70cb LG |
3175 | * |
3176 | * Unregister regulator event notifier block. | |
3177 | */ | |
3178 | int regulator_unregister_notifier(struct regulator *regulator, | |
3179 | struct notifier_block *nb) | |
3180 | { | |
3181 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3182 | nb); | |
3183 | } | |
3184 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3185 | ||
b136fb44 JC |
3186 | /* notify regulator consumers and downstream regulator consumers. |
3187 | * Note mutex must be held by caller. | |
3188 | */ | |
7179569a | 3189 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3190 | unsigned long event, void *data) |
3191 | { | |
414c70cb | 3192 | /* call rdev chain first */ |
7179569a | 3193 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3194 | } |
3195 | ||
3196 | /** | |
3197 | * regulator_bulk_get - get multiple regulator consumers | |
3198 | * | |
3199 | * @dev: Device to supply | |
3200 | * @num_consumers: Number of consumers to register | |
3201 | * @consumers: Configuration of consumers; clients are stored here. | |
3202 | * | |
3203 | * @return 0 on success, an errno on failure. | |
3204 | * | |
3205 | * This helper function allows drivers to get several regulator | |
3206 | * consumers in one operation. If any of the regulators cannot be | |
3207 | * acquired then any regulators that were allocated will be freed | |
3208 | * before returning to the caller. | |
3209 | */ | |
3210 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3211 | struct regulator_bulk_data *consumers) | |
3212 | { | |
3213 | int i; | |
3214 | int ret; | |
3215 | ||
3216 | for (i = 0; i < num_consumers; i++) | |
3217 | consumers[i].consumer = NULL; | |
3218 | ||
3219 | for (i = 0; i < num_consumers; i++) { | |
3220 | consumers[i].consumer = regulator_get(dev, | |
3221 | consumers[i].supply); | |
3222 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 3223 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3224 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3225 | consumers[i].supply, ret); | |
414c70cb LG |
3226 | consumers[i].consumer = NULL; |
3227 | goto err; | |
3228 | } | |
3229 | } | |
3230 | ||
3231 | return 0; | |
3232 | ||
3233 | err: | |
b29c7690 | 3234 | while (--i >= 0) |
414c70cb LG |
3235 | regulator_put(consumers[i].consumer); |
3236 | ||
3237 | return ret; | |
3238 | } | |
3239 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3240 | ||
f21e0e81 MB |
3241 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3242 | { | |
3243 | struct regulator_bulk_data *bulk = data; | |
3244 | ||
3245 | bulk->ret = regulator_enable(bulk->consumer); | |
3246 | } | |
3247 | ||
414c70cb LG |
3248 | /** |
3249 | * regulator_bulk_enable - enable multiple regulator consumers | |
3250 | * | |
3251 | * @num_consumers: Number of consumers | |
3252 | * @consumers: Consumer data; clients are stored here. | |
3253 | * @return 0 on success, an errno on failure | |
3254 | * | |
3255 | * This convenience API allows consumers to enable multiple regulator | |
3256 | * clients in a single API call. If any consumers cannot be enabled | |
3257 | * then any others that were enabled will be disabled again prior to | |
3258 | * return. | |
3259 | */ | |
3260 | int regulator_bulk_enable(int num_consumers, | |
3261 | struct regulator_bulk_data *consumers) | |
3262 | { | |
2955b47d | 3263 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3264 | int i; |
f21e0e81 | 3265 | int ret = 0; |
414c70cb | 3266 | |
6492bc1b MB |
3267 | for (i = 0; i < num_consumers; i++) { |
3268 | if (consumers[i].consumer->always_on) | |
3269 | consumers[i].ret = 0; | |
3270 | else | |
3271 | async_schedule_domain(regulator_bulk_enable_async, | |
3272 | &consumers[i], &async_domain); | |
3273 | } | |
f21e0e81 MB |
3274 | |
3275 | async_synchronize_full_domain(&async_domain); | |
3276 | ||
3277 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3278 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3279 | if (consumers[i].ret != 0) { |
3280 | ret = consumers[i].ret; | |
414c70cb | 3281 | goto err; |
f21e0e81 | 3282 | } |
414c70cb LG |
3283 | } |
3284 | ||
3285 | return 0; | |
3286 | ||
3287 | err: | |
fbe31057 AH |
3288 | for (i = 0; i < num_consumers; i++) { |
3289 | if (consumers[i].ret < 0) | |
3290 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3291 | consumers[i].ret); | |
3292 | else | |
3293 | regulator_disable(consumers[i].consumer); | |
3294 | } | |
414c70cb LG |
3295 | |
3296 | return ret; | |
3297 | } | |
3298 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3299 | ||
3300 | /** | |
3301 | * regulator_bulk_disable - disable multiple regulator consumers | |
3302 | * | |
3303 | * @num_consumers: Number of consumers | |
3304 | * @consumers: Consumer data; clients are stored here. | |
3305 | * @return 0 on success, an errno on failure | |
3306 | * | |
3307 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3308 | * clients in a single API call. If any consumers cannot be disabled |
3309 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3310 | * return. |
3311 | */ | |
3312 | int regulator_bulk_disable(int num_consumers, | |
3313 | struct regulator_bulk_data *consumers) | |
3314 | { | |
3315 | int i; | |
01e86f49 | 3316 | int ret, r; |
414c70cb | 3317 | |
49e22632 | 3318 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3319 | ret = regulator_disable(consumers[i].consumer); |
3320 | if (ret != 0) | |
3321 | goto err; | |
3322 | } | |
3323 | ||
3324 | return 0; | |
3325 | ||
3326 | err: | |
5da84fd9 | 3327 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3328 | for (++i; i < num_consumers; ++i) { |
3329 | r = regulator_enable(consumers[i].consumer); | |
3330 | if (r != 0) | |
3331 | pr_err("Failed to reename %s: %d\n", | |
3332 | consumers[i].supply, r); | |
3333 | } | |
414c70cb LG |
3334 | |
3335 | return ret; | |
3336 | } | |
3337 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3338 | ||
e1de2f42 DK |
3339 | /** |
3340 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3341 | * | |
3342 | * @num_consumers: Number of consumers | |
3343 | * @consumers: Consumer data; clients are stored here. | |
3344 | * @return 0 on success, an errno on failure | |
3345 | * | |
3346 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3347 | * clients in a single API call. | |
3348 | * NOTE: This should be used for situations when device damage will | |
3349 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3350 | * Although regulator_force_disable function call for some consumers can | |
3351 | * return error numbers, the function is called for all consumers. | |
3352 | */ | |
3353 | int regulator_bulk_force_disable(int num_consumers, | |
3354 | struct regulator_bulk_data *consumers) | |
3355 | { | |
3356 | int i; | |
3357 | int ret; | |
3358 | ||
3359 | for (i = 0; i < num_consumers; i++) | |
3360 | consumers[i].ret = | |
3361 | regulator_force_disable(consumers[i].consumer); | |
3362 | ||
3363 | for (i = 0; i < num_consumers; i++) { | |
3364 | if (consumers[i].ret != 0) { | |
3365 | ret = consumers[i].ret; | |
3366 | goto out; | |
3367 | } | |
3368 | } | |
3369 | ||
3370 | return 0; | |
3371 | out: | |
3372 | return ret; | |
3373 | } | |
3374 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3375 | ||
414c70cb LG |
3376 | /** |
3377 | * regulator_bulk_free - free multiple regulator consumers | |
3378 | * | |
3379 | * @num_consumers: Number of consumers | |
3380 | * @consumers: Consumer data; clients are stored here. | |
3381 | * | |
3382 | * This convenience API allows consumers to free multiple regulator | |
3383 | * clients in a single API call. | |
3384 | */ | |
3385 | void regulator_bulk_free(int num_consumers, | |
3386 | struct regulator_bulk_data *consumers) | |
3387 | { | |
3388 | int i; | |
3389 | ||
3390 | for (i = 0; i < num_consumers; i++) { | |
3391 | regulator_put(consumers[i].consumer); | |
3392 | consumers[i].consumer = NULL; | |
3393 | } | |
3394 | } | |
3395 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3396 | ||
3397 | /** | |
3398 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3399 | * @rdev: regulator source |
414c70cb | 3400 | * @event: notifier block |
69279fb9 | 3401 | * @data: callback-specific data. |
414c70cb LG |
3402 | * |
3403 | * Called by regulator drivers to notify clients a regulator event has | |
3404 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3405 | * Note lock must be held by caller. |
414c70cb LG |
3406 | */ |
3407 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3408 | unsigned long event, void *data) | |
3409 | { | |
3410 | _notifier_call_chain(rdev, event, data); | |
3411 | return NOTIFY_DONE; | |
3412 | ||
3413 | } | |
3414 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3415 | ||
be721979 MB |
3416 | /** |
3417 | * regulator_mode_to_status - convert a regulator mode into a status | |
3418 | * | |
3419 | * @mode: Mode to convert | |
3420 | * | |
3421 | * Convert a regulator mode into a status. | |
3422 | */ | |
3423 | int regulator_mode_to_status(unsigned int mode) | |
3424 | { | |
3425 | switch (mode) { | |
3426 | case REGULATOR_MODE_FAST: | |
3427 | return REGULATOR_STATUS_FAST; | |
3428 | case REGULATOR_MODE_NORMAL: | |
3429 | return REGULATOR_STATUS_NORMAL; | |
3430 | case REGULATOR_MODE_IDLE: | |
3431 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3432 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3433 | return REGULATOR_STATUS_STANDBY; |
3434 | default: | |
1beaf762 | 3435 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3436 | } |
3437 | } | |
3438 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3439 | ||
39f802d6 TI |
3440 | static struct attribute *regulator_dev_attrs[] = { |
3441 | &dev_attr_name.attr, | |
3442 | &dev_attr_num_users.attr, | |
3443 | &dev_attr_type.attr, | |
3444 | &dev_attr_microvolts.attr, | |
3445 | &dev_attr_microamps.attr, | |
3446 | &dev_attr_opmode.attr, | |
3447 | &dev_attr_state.attr, | |
3448 | &dev_attr_status.attr, | |
3449 | &dev_attr_bypass.attr, | |
3450 | &dev_attr_requested_microamps.attr, | |
3451 | &dev_attr_min_microvolts.attr, | |
3452 | &dev_attr_max_microvolts.attr, | |
3453 | &dev_attr_min_microamps.attr, | |
3454 | &dev_attr_max_microamps.attr, | |
3455 | &dev_attr_suspend_standby_state.attr, | |
3456 | &dev_attr_suspend_mem_state.attr, | |
3457 | &dev_attr_suspend_disk_state.attr, | |
3458 | &dev_attr_suspend_standby_microvolts.attr, | |
3459 | &dev_attr_suspend_mem_microvolts.attr, | |
3460 | &dev_attr_suspend_disk_microvolts.attr, | |
3461 | &dev_attr_suspend_standby_mode.attr, | |
3462 | &dev_attr_suspend_mem_mode.attr, | |
3463 | &dev_attr_suspend_disk_mode.attr, | |
3464 | NULL | |
3465 | }; | |
3466 | ||
7ad68e2f DB |
3467 | /* |
3468 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3469 | * create attributes that can be meaningfully displayed. | |
3470 | */ | |
39f802d6 TI |
3471 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3472 | struct attribute *attr, int idx) | |
7ad68e2f | 3473 | { |
39f802d6 TI |
3474 | struct device *dev = kobj_to_dev(kobj); |
3475 | struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev); | |
272e2315 | 3476 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3477 | umode_t mode = attr->mode; |
3478 | ||
3479 | /* these three are always present */ | |
3480 | if (attr == &dev_attr_name.attr || | |
3481 | attr == &dev_attr_num_users.attr || | |
3482 | attr == &dev_attr_type.attr) | |
3483 | return mode; | |
7ad68e2f DB |
3484 | |
3485 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3486 | if (attr == &dev_attr_microvolts.attr) { |
3487 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3488 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3489 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3490 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3491 | return mode; | |
3492 | return 0; | |
f59c8f9f | 3493 | } |
7ad68e2f | 3494 | |
39f802d6 TI |
3495 | if (attr == &dev_attr_microamps.attr) |
3496 | return ops->get_current_limit ? mode : 0; | |
3497 | ||
3498 | if (attr == &dev_attr_opmode.attr) | |
3499 | return ops->get_mode ? mode : 0; | |
3500 | ||
3501 | if (attr == &dev_attr_state.attr) | |
3502 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3503 | ||
3504 | if (attr == &dev_attr_status.attr) | |
3505 | return ops->get_status ? mode : 0; | |
3506 | ||
3507 | if (attr == &dev_attr_bypass.attr) | |
3508 | return ops->get_bypass ? mode : 0; | |
3509 | ||
7ad68e2f | 3510 | /* some attributes are type-specific */ |
39f802d6 TI |
3511 | if (attr == &dev_attr_requested_microamps.attr) |
3512 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3513 | |
7ad68e2f | 3514 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3515 | if (attr == &dev_attr_min_microvolts.attr || |
3516 | attr == &dev_attr_max_microvolts.attr) | |
3517 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3518 | ||
3519 | if (attr == &dev_attr_min_microamps.attr || | |
3520 | attr == &dev_attr_max_microamps.attr) | |
3521 | return ops->set_current_limit ? mode : 0; | |
3522 | ||
3523 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3524 | attr == &dev_attr_suspend_mem_state.attr || | |
3525 | attr == &dev_attr_suspend_disk_state.attr) | |
3526 | return mode; | |
3527 | ||
3528 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3529 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3530 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3531 | return ops->set_suspend_voltage ? mode : 0; | |
3532 | ||
3533 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
3534 | attr == &dev_attr_suspend_mem_mode.attr || | |
3535 | attr == &dev_attr_suspend_disk_mode.attr) | |
3536 | return ops->set_suspend_mode ? mode : 0; | |
3537 | ||
3538 | return mode; | |
3539 | } | |
3540 | ||
3541 | static const struct attribute_group regulator_dev_group = { | |
3542 | .attrs = regulator_dev_attrs, | |
3543 | .is_visible = regulator_attr_is_visible, | |
3544 | }; | |
3545 | ||
3546 | static const struct attribute_group *regulator_dev_groups[] = { | |
3547 | ®ulator_dev_group, | |
3548 | NULL | |
3549 | }; | |
7ad68e2f | 3550 | |
39f802d6 TI |
3551 | static void regulator_dev_release(struct device *dev) |
3552 | { | |
3553 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
3554 | kfree(rdev); | |
7ad68e2f DB |
3555 | } |
3556 | ||
39f802d6 TI |
3557 | static struct class regulator_class = { |
3558 | .name = "regulator", | |
3559 | .dev_release = regulator_dev_release, | |
3560 | .dev_groups = regulator_dev_groups, | |
3561 | }; | |
3562 | ||
1130e5b3 MB |
3563 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3564 | { | |
a9eaa813 GR |
3565 | struct device *parent = rdev->dev.parent; |
3566 | const char *rname = rdev_get_name(rdev); | |
3567 | char name[NAME_MAX]; | |
3568 | ||
3569 | /* Avoid duplicate debugfs directory names */ | |
3570 | if (parent && rname == rdev->desc->name) { | |
3571 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
3572 | rname); | |
3573 | rname = name; | |
3574 | } | |
3575 | ||
3576 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 3577 | if (!rdev->debugfs) { |
1130e5b3 | 3578 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3579 | return; |
3580 | } | |
3581 | ||
3582 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3583 | &rdev->use_count); | |
3584 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3585 | &rdev->open_count); | |
f59c8f9f MB |
3586 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3587 | &rdev->bypass_count); | |
1130e5b3 MB |
3588 | } |
3589 | ||
414c70cb LG |
3590 | /** |
3591 | * regulator_register - register regulator | |
69279fb9 | 3592 | * @regulator_desc: regulator to register |
f47531b1 | 3593 | * @cfg: runtime configuration for regulator |
414c70cb LG |
3594 | * |
3595 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3596 | * Returns a valid pointer to struct regulator_dev on success |
3597 | * or an ERR_PTR() on error. | |
414c70cb | 3598 | */ |
65f26846 MB |
3599 | struct regulator_dev * |
3600 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 3601 | const struct regulator_config *cfg) |
414c70cb | 3602 | { |
9a8f5e07 | 3603 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3604 | const struct regulator_init_data *init_data; |
1b3de223 | 3605 | struct regulator_config *config = NULL; |
72dca06f | 3606 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 3607 | struct regulator_dev *rdev; |
32c8fad4 | 3608 | struct device *dev; |
a5766f11 | 3609 | int ret, i; |
414c70cb | 3610 | |
1b3de223 | 3611 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
3612 | return ERR_PTR(-EINVAL); |
3613 | ||
1b3de223 | 3614 | dev = cfg->dev; |
dcf70112 | 3615 | WARN_ON(!dev); |
32c8fad4 | 3616 | |
414c70cb LG |
3617 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3618 | return ERR_PTR(-EINVAL); | |
3619 | ||
cd78dfc6 DL |
3620 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3621 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3622 | return ERR_PTR(-EINVAL); |
3623 | ||
476c2d83 MB |
3624 | /* Only one of each should be implemented */ |
3625 | WARN_ON(regulator_desc->ops->get_voltage && | |
3626 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3627 | WARN_ON(regulator_desc->ops->set_voltage && |
3628 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3629 | |
3630 | /* If we're using selectors we must implement list_voltage. */ | |
3631 | if (regulator_desc->ops->get_voltage_sel && | |
3632 | !regulator_desc->ops->list_voltage) { | |
3633 | return ERR_PTR(-EINVAL); | |
3634 | } | |
e8eef82b MB |
3635 | if (regulator_desc->ops->set_voltage_sel && |
3636 | !regulator_desc->ops->list_voltage) { | |
3637 | return ERR_PTR(-EINVAL); | |
3638 | } | |
476c2d83 | 3639 | |
414c70cb LG |
3640 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3641 | if (rdev == NULL) | |
3642 | return ERR_PTR(-ENOMEM); | |
3643 | ||
1b3de223 KK |
3644 | /* |
3645 | * Duplicate the config so the driver could override it after | |
3646 | * parsing init data. | |
3647 | */ | |
3648 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
3649 | if (config == NULL) { | |
3650 | kfree(rdev); | |
3651 | return ERR_PTR(-ENOMEM); | |
3652 | } | |
3653 | ||
bfa21a0d | 3654 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
3655 | &rdev->dev.of_node); |
3656 | if (!init_data) { | |
3657 | init_data = config->init_data; | |
3658 | rdev->dev.of_node = of_node_get(config->of_node); | |
3659 | } | |
3660 | ||
414c70cb LG |
3661 | mutex_lock(®ulator_list_mutex); |
3662 | ||
3663 | mutex_init(&rdev->mutex); | |
c172708d | 3664 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3665 | rdev->owner = regulator_desc->owner; |
3666 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3667 | if (config->regmap) |
3668 | rdev->regmap = config->regmap; | |
52b84dac | 3669 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3670 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3671 | else if (dev->parent) |
3672 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3673 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3674 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3675 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3676 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3677 | |
a5766f11 | 3678 | /* preform any regulator specific init */ |
9a8f5e07 | 3679 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3680 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3681 | if (ret < 0) |
3682 | goto clean; | |
a5766f11 LG |
3683 | } |
3684 | ||
a5766f11 | 3685 | /* register with sysfs */ |
414c70cb | 3686 | rdev->dev.class = ®ulator_class; |
a5766f11 | 3687 | rdev->dev.parent = dev; |
72dca06f | 3688 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 3689 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 3690 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3691 | if (ret != 0) { |
3692 | put_device(&rdev->dev); | |
4fca9545 | 3693 | goto clean; |
ad7725cb | 3694 | } |
a5766f11 LG |
3695 | |
3696 | dev_set_drvdata(&rdev->dev, rdev); | |
3697 | ||
76f439df MP |
3698 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
3699 | gpio_is_valid(config->ena_gpio)) { | |
f19b00da | 3700 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3701 | if (ret != 0) { |
3702 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3703 | config->ena_gpio, ret); | |
b2da55d9 | 3704 | goto wash; |
65f73508 | 3705 | } |
65f73508 MB |
3706 | } |
3707 | ||
74f544c1 | 3708 | /* set regulator constraints */ |
9a8f5e07 MB |
3709 | if (init_data) |
3710 | constraints = &init_data->constraints; | |
3711 | ||
3712 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3713 | if (ret < 0) |
3714 | goto scrub; | |
3715 | ||
9a8f5e07 | 3716 | if (init_data && init_data->supply_regulator) |
6261b06d | 3717 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 3718 | else if (regulator_desc->supply_name) |
6261b06d | 3719 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 3720 | |
a5766f11 | 3721 | /* add consumers devices */ |
9a8f5e07 MB |
3722 | if (init_data) { |
3723 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3724 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3725 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3726 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3727 | if (ret < 0) { |
3728 | dev_err(dev, "Failed to set supply %s\n", | |
3729 | init_data->consumer_supplies[i].supply); | |
3730 | goto unset_supplies; | |
3731 | } | |
23c2f041 | 3732 | } |
414c70cb | 3733 | } |
a5766f11 LG |
3734 | |
3735 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3736 | |
3737 | rdev_init_debugfs(rdev); | |
a5766f11 | 3738 | out: |
414c70cb | 3739 | mutex_unlock(®ulator_list_mutex); |
1b3de223 | 3740 | kfree(config); |
414c70cb | 3741 | return rdev; |
4fca9545 | 3742 | |
d4033b54 JN |
3743 | unset_supplies: |
3744 | unset_regulator_supplies(rdev); | |
3745 | ||
4fca9545 | 3746 | scrub: |
f19b00da | 3747 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3748 | kfree(rdev->constraints); |
b2da55d9 | 3749 | wash: |
4fca9545 | 3750 | device_unregister(&rdev->dev); |
53032daf PW |
3751 | /* device core frees rdev */ |
3752 | rdev = ERR_PTR(ret); | |
3753 | goto out; | |
3754 | ||
4fca9545 DB |
3755 | clean: |
3756 | kfree(rdev); | |
3757 | rdev = ERR_PTR(ret); | |
3758 | goto out; | |
414c70cb LG |
3759 | } |
3760 | EXPORT_SYMBOL_GPL(regulator_register); | |
3761 | ||
3762 | /** | |
3763 | * regulator_unregister - unregister regulator | |
69279fb9 | 3764 | * @rdev: regulator to unregister |
414c70cb LG |
3765 | * |
3766 | * Called by regulator drivers to unregister a regulator. | |
3767 | */ | |
3768 | void regulator_unregister(struct regulator_dev *rdev) | |
3769 | { | |
3770 | if (rdev == NULL) | |
3771 | return; | |
3772 | ||
891636ea MB |
3773 | if (rdev->supply) { |
3774 | while (rdev->use_count--) | |
3775 | regulator_disable(rdev->supply); | |
e032b376 | 3776 | regulator_put(rdev->supply); |
891636ea | 3777 | } |
414c70cb | 3778 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3779 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3780 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3781 | WARN_ON(rdev->open_count); |
0f1d747b | 3782 | unset_regulator_supplies(rdev); |
414c70cb | 3783 | list_del(&rdev->list); |
f8c12fe3 | 3784 | kfree(rdev->constraints); |
f19b00da | 3785 | regulator_ena_gpio_free(rdev); |
63c7c9e1 | 3786 | of_node_put(rdev->dev.of_node); |
58fb5cf5 | 3787 | device_unregister(&rdev->dev); |
414c70cb LG |
3788 | mutex_unlock(®ulator_list_mutex); |
3789 | } | |
3790 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3791 | ||
414c70cb | 3792 | /** |
cf7bbcdf | 3793 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3794 | * @state: system suspend state |
3795 | * | |
3796 | * Configure each regulator with it's suspend operating parameters for state. | |
3797 | * This will usually be called by machine suspend code prior to supending. | |
3798 | */ | |
3799 | int regulator_suspend_prepare(suspend_state_t state) | |
3800 | { | |
3801 | struct regulator_dev *rdev; | |
3802 | int ret = 0; | |
3803 | ||
3804 | /* ON is handled by regulator active state */ | |
3805 | if (state == PM_SUSPEND_ON) | |
3806 | return -EINVAL; | |
3807 | ||
3808 | mutex_lock(®ulator_list_mutex); | |
3809 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3810 | ||
3811 | mutex_lock(&rdev->mutex); | |
3812 | ret = suspend_prepare(rdev, state); | |
3813 | mutex_unlock(&rdev->mutex); | |
3814 | ||
3815 | if (ret < 0) { | |
5da84fd9 | 3816 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3817 | goto out; |
3818 | } | |
3819 | } | |
3820 | out: | |
3821 | mutex_unlock(®ulator_list_mutex); | |
3822 | return ret; | |
3823 | } | |
3824 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3825 | ||
7a32b589 MH |
3826 | /** |
3827 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3828 | * | |
3829 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3830 | * and that should be turned on according to the regulators properties. | |
3831 | */ | |
3832 | int regulator_suspend_finish(void) | |
3833 | { | |
3834 | struct regulator_dev *rdev; | |
3835 | int ret = 0, error; | |
3836 | ||
3837 | mutex_lock(®ulator_list_mutex); | |
3838 | list_for_each_entry(rdev, ®ulator_list, list) { | |
7a32b589 | 3839 | mutex_lock(&rdev->mutex); |
30c21971 | 3840 | if (rdev->use_count > 0 || rdev->constraints->always_on) { |
0548bf4f JMC |
3841 | if (!_regulator_is_enabled(rdev)) { |
3842 | error = _regulator_do_enable(rdev); | |
3843 | if (error) | |
3844 | ret = error; | |
3845 | } | |
7a32b589 | 3846 | } else { |
87b28417 | 3847 | if (!have_full_constraints()) |
7a32b589 | 3848 | goto unlock; |
b1a86831 | 3849 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3850 | goto unlock; |
3851 | ||
66fda75f | 3852 | error = _regulator_do_disable(rdev); |
7a32b589 MH |
3853 | if (error) |
3854 | ret = error; | |
3855 | } | |
3856 | unlock: | |
3857 | mutex_unlock(&rdev->mutex); | |
3858 | } | |
3859 | mutex_unlock(®ulator_list_mutex); | |
3860 | return ret; | |
3861 | } | |
3862 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3863 | ||
ca725561 MB |
3864 | /** |
3865 | * regulator_has_full_constraints - the system has fully specified constraints | |
3866 | * | |
3867 | * Calling this function will cause the regulator API to disable all | |
3868 | * regulators which have a zero use count and don't have an always_on | |
3869 | * constraint in a late_initcall. | |
3870 | * | |
3871 | * The intention is that this will become the default behaviour in a | |
3872 | * future kernel release so users are encouraged to use this facility | |
3873 | * now. | |
3874 | */ | |
3875 | void regulator_has_full_constraints(void) | |
3876 | { | |
3877 | has_full_constraints = 1; | |
3878 | } | |
3879 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3880 | ||
414c70cb LG |
3881 | /** |
3882 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3883 | * @rdev: regulator |
414c70cb LG |
3884 | * |
3885 | * Get rdev regulator driver private data. This call can be used in the | |
3886 | * regulator driver context. | |
3887 | */ | |
3888 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3889 | { | |
3890 | return rdev->reg_data; | |
3891 | } | |
3892 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3893 | ||
3894 | /** | |
3895 | * regulator_get_drvdata - get regulator driver data | |
3896 | * @regulator: regulator | |
3897 | * | |
3898 | * Get regulator driver private data. This call can be used in the consumer | |
3899 | * driver context when non API regulator specific functions need to be called. | |
3900 | */ | |
3901 | void *regulator_get_drvdata(struct regulator *regulator) | |
3902 | { | |
3903 | return regulator->rdev->reg_data; | |
3904 | } | |
3905 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3906 | ||
3907 | /** | |
3908 | * regulator_set_drvdata - set regulator driver data | |
3909 | * @regulator: regulator | |
3910 | * @data: data | |
3911 | */ | |
3912 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3913 | { | |
3914 | regulator->rdev->reg_data = data; | |
3915 | } | |
3916 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3917 | ||
3918 | /** | |
3919 | * regulator_get_id - get regulator ID | |
69279fb9 | 3920 | * @rdev: regulator |
414c70cb LG |
3921 | */ |
3922 | int rdev_get_id(struct regulator_dev *rdev) | |
3923 | { | |
3924 | return rdev->desc->id; | |
3925 | } | |
3926 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3927 | ||
a5766f11 LG |
3928 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3929 | { | |
3930 | return &rdev->dev; | |
3931 | } | |
3932 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3933 | ||
3934 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3935 | { | |
3936 | return reg_init_data->driver_data; | |
3937 | } | |
3938 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3939 | ||
ba55a974 MB |
3940 | #ifdef CONFIG_DEBUG_FS |
3941 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3942 | size_t count, loff_t *ppos) | |
3943 | { | |
3944 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3945 | ssize_t len, ret = 0; | |
3946 | struct regulator_map *map; | |
3947 | ||
3948 | if (!buf) | |
3949 | return -ENOMEM; | |
3950 | ||
3951 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3952 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3953 | "%s -> %s.%s\n", | |
3954 | rdev_get_name(map->regulator), map->dev_name, | |
3955 | map->supply); | |
3956 | if (len >= 0) | |
3957 | ret += len; | |
3958 | if (ret > PAGE_SIZE) { | |
3959 | ret = PAGE_SIZE; | |
3960 | break; | |
3961 | } | |
3962 | } | |
3963 | ||
3964 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3965 | ||
3966 | kfree(buf); | |
3967 | ||
3968 | return ret; | |
3969 | } | |
24751434 | 3970 | #endif |
ba55a974 MB |
3971 | |
3972 | static const struct file_operations supply_map_fops = { | |
24751434 | 3973 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3974 | .read = supply_map_read_file, |
3975 | .llseek = default_llseek, | |
ba55a974 | 3976 | #endif |
24751434 | 3977 | }; |
ba55a974 | 3978 | |
7c225ec9 HS |
3979 | #ifdef CONFIG_DEBUG_FS |
3980 | static void regulator_summary_show_subtree(struct seq_file *s, | |
3981 | struct regulator_dev *rdev, | |
3982 | int level) | |
3983 | { | |
3984 | struct list_head *list = s->private; | |
3985 | struct regulator_dev *child; | |
3986 | struct regulation_constraints *c; | |
3987 | struct regulator *consumer; | |
3988 | ||
3989 | if (!rdev) | |
3990 | return; | |
3991 | ||
7c225ec9 HS |
3992 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
3993 | level * 3 + 1, "", | |
3994 | 30 - level * 3, rdev_get_name(rdev), | |
3995 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
3996 | ||
23296099 HS |
3997 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
3998 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
3999 | |
4000 | c = rdev->constraints; | |
4001 | if (c) { | |
4002 | switch (rdev->desc->type) { | |
4003 | case REGULATOR_VOLTAGE: | |
4004 | seq_printf(s, "%5dmV %5dmV ", | |
4005 | c->min_uV / 1000, c->max_uV / 1000); | |
4006 | break; | |
4007 | case REGULATOR_CURRENT: | |
4008 | seq_printf(s, "%5dmA %5dmA ", | |
4009 | c->min_uA / 1000, c->max_uA / 1000); | |
4010 | break; | |
4011 | } | |
4012 | } | |
4013 | ||
4014 | seq_puts(s, "\n"); | |
4015 | ||
4016 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
4017 | if (consumer->dev->class == ®ulator_class) | |
4018 | continue; | |
4019 | ||
4020 | seq_printf(s, "%*s%-*s ", | |
4021 | (level + 1) * 3 + 1, "", | |
4022 | 30 - (level + 1) * 3, dev_name(consumer->dev)); | |
4023 | ||
4024 | switch (rdev->desc->type) { | |
4025 | case REGULATOR_VOLTAGE: | |
23296099 | 4026 | seq_printf(s, "%37dmV %5dmV", |
7c225ec9 HS |
4027 | consumer->min_uV / 1000, |
4028 | consumer->max_uV / 1000); | |
4029 | break; | |
4030 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4031 | break; |
4032 | } | |
4033 | ||
4034 | seq_puts(s, "\n"); | |
4035 | } | |
4036 | ||
7c225ec9 HS |
4037 | list_for_each_entry(child, list, list) { |
4038 | /* handle only non-root regulators supplied by current rdev */ | |
4039 | if (!child->supply || child->supply->rdev != rdev) | |
4040 | continue; | |
4041 | ||
4042 | regulator_summary_show_subtree(s, child, level + 1); | |
4043 | } | |
4044 | } | |
4045 | ||
4046 | static int regulator_summary_show(struct seq_file *s, void *data) | |
4047 | { | |
4048 | struct list_head *list = s->private; | |
4049 | struct regulator_dev *rdev; | |
4050 | ||
23296099 HS |
4051 | seq_puts(s, " regulator use open bypass voltage current min max\n"); |
4052 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 HS |
4053 | |
4054 | mutex_lock(®ulator_list_mutex); | |
4055 | ||
4056 | list_for_each_entry(rdev, list, list) { | |
4057 | if (rdev->supply) | |
4058 | continue; | |
4059 | ||
4060 | regulator_summary_show_subtree(s, rdev, 0); | |
4061 | } | |
4062 | ||
4063 | mutex_unlock(®ulator_list_mutex); | |
4064 | ||
4065 | return 0; | |
4066 | } | |
4067 | ||
4068 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4069 | { | |
4070 | return single_open(file, regulator_summary_show, inode->i_private); | |
4071 | } | |
4072 | #endif | |
4073 | ||
4074 | static const struct file_operations regulator_summary_fops = { | |
4075 | #ifdef CONFIG_DEBUG_FS | |
4076 | .open = regulator_summary_open, | |
4077 | .read = seq_read, | |
4078 | .llseek = seq_lseek, | |
4079 | .release = single_release, | |
4080 | #endif | |
4081 | }; | |
4082 | ||
414c70cb LG |
4083 | static int __init regulator_init(void) |
4084 | { | |
34abbd68 MB |
4085 | int ret; |
4086 | ||
34abbd68 MB |
4087 | ret = class_register(®ulator_class); |
4088 | ||
1130e5b3 | 4089 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4090 | if (!debugfs_root) |
1130e5b3 | 4091 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4092 | |
f4d562c6 MB |
4093 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4094 | &supply_map_fops); | |
1130e5b3 | 4095 | |
7c225ec9 HS |
4096 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
4097 | ®ulator_list, ®ulator_summary_fops); | |
4098 | ||
34abbd68 MB |
4099 | regulator_dummy_init(); |
4100 | ||
4101 | return ret; | |
414c70cb LG |
4102 | } |
4103 | ||
4104 | /* init early to allow our consumers to complete system booting */ | |
4105 | core_initcall(regulator_init); | |
ca725561 MB |
4106 | |
4107 | static int __init regulator_init_complete(void) | |
4108 | { | |
4109 | struct regulator_dev *rdev; | |
272e2315 | 4110 | const struct regulator_ops *ops; |
ca725561 MB |
4111 | struct regulation_constraints *c; |
4112 | int enabled, ret; | |
ca725561 | 4113 | |
86f5fcfc MB |
4114 | /* |
4115 | * Since DT doesn't provide an idiomatic mechanism for | |
4116 | * enabling full constraints and since it's much more natural | |
4117 | * with DT to provide them just assume that a DT enabled | |
4118 | * system has full constraints. | |
4119 | */ | |
4120 | if (of_have_populated_dt()) | |
4121 | has_full_constraints = true; | |
4122 | ||
ca725561 MB |
4123 | mutex_lock(®ulator_list_mutex); |
4124 | ||
4125 | /* If we have a full configuration then disable any regulators | |
e9535834 MB |
4126 | * we have permission to change the status for and which are |
4127 | * not in use or always_on. This is effectively the default | |
4128 | * for DT and ACPI as they have full constraints. | |
ca725561 MB |
4129 | */ |
4130 | list_for_each_entry(rdev, ®ulator_list, list) { | |
4131 | ops = rdev->desc->ops; | |
4132 | c = rdev->constraints; | |
4133 | ||
66fda75f | 4134 | if (c && c->always_on) |
ca725561 MB |
4135 | continue; |
4136 | ||
e9535834 MB |
4137 | if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) |
4138 | continue; | |
4139 | ||
ca725561 MB |
4140 | mutex_lock(&rdev->mutex); |
4141 | ||
4142 | if (rdev->use_count) | |
4143 | goto unlock; | |
4144 | ||
4145 | /* If we can't read the status assume it's on. */ | |
4146 | if (ops->is_enabled) | |
4147 | enabled = ops->is_enabled(rdev); | |
4148 | else | |
4149 | enabled = 1; | |
4150 | ||
4151 | if (!enabled) | |
4152 | goto unlock; | |
4153 | ||
87b28417 | 4154 | if (have_full_constraints()) { |
ca725561 MB |
4155 | /* We log since this may kill the system if it |
4156 | * goes wrong. */ | |
5da84fd9 | 4157 | rdev_info(rdev, "disabling\n"); |
66fda75f | 4158 | ret = _regulator_do_disable(rdev); |
0d25d09d | 4159 | if (ret != 0) |
5da84fd9 | 4160 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
4161 | } else { |
4162 | /* The intention is that in future we will | |
4163 | * assume that full constraints are provided | |
4164 | * so warn even if we aren't going to do | |
4165 | * anything here. | |
4166 | */ | |
5da84fd9 | 4167 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
4168 | } |
4169 | ||
4170 | unlock: | |
4171 | mutex_unlock(&rdev->mutex); | |
4172 | } | |
4173 | ||
4174 | mutex_unlock(®ulator_list_mutex); | |
4175 | ||
4176 | return 0; | |
4177 | } | |
fd482a3e | 4178 | late_initcall_sync(regulator_init_complete); |