Commit | Line | Data |
---|---|---|
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> |
69511a45 | 27 | #include <linux/of.h> |
65b19ce6 | 28 | #include <linux/regmap.h> |
69511a45 | 29 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
30 | #include <linux/regulator/consumer.h> |
31 | #include <linux/regulator/driver.h> | |
32 | #include <linux/regulator/machine.h> | |
65602c32 | 33 | #include <linux/module.h> |
414c70cb | 34 | |
02fa3ec0 MB |
35 | #define CREATE_TRACE_POINTS |
36 | #include <trace/events/regulator.h> | |
37 | ||
34abbd68 | 38 | #include "dummy.h" |
0cdfcc0f | 39 | #include "internal.h" |
34abbd68 | 40 | |
7d51a0db MB |
41 | #define rdev_crit(rdev, fmt, ...) \ |
42 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
43 | #define rdev_err(rdev, fmt, ...) \ |
44 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | #define rdev_warn(rdev, fmt, ...) \ | |
46 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
47 | #define rdev_info(rdev, fmt, ...) \ | |
48 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
49 | #define rdev_dbg(rdev, fmt, ...) \ | |
50 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
51 | ||
414c70cb LG |
52 | static DEFINE_MUTEX(regulator_list_mutex); |
53 | static LIST_HEAD(regulator_list); | |
54 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 55 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 56 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 57 | static bool has_full_constraints; |
414c70cb | 58 | |
1130e5b3 | 59 | static struct dentry *debugfs_root; |
1130e5b3 | 60 | |
8dc5390d | 61 | /* |
414c70cb LG |
62 | * struct regulator_map |
63 | * | |
64 | * Used to provide symbolic supply names to devices. | |
65 | */ | |
66 | struct regulator_map { | |
67 | struct list_head list; | |
40f9244f | 68 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 69 | const char *supply; |
a5766f11 | 70 | struct regulator_dev *regulator; |
414c70cb LG |
71 | }; |
72 | ||
f19b00da KM |
73 | /* |
74 | * struct regulator_enable_gpio | |
75 | * | |
76 | * Management for shared enable GPIO pin | |
77 | */ | |
78 | struct regulator_enable_gpio { | |
79 | struct list_head list; | |
80 | int gpio; | |
81 | u32 enable_count; /* a number of enabled shared GPIO */ | |
82 | u32 request_count; /* a number of requested shared GPIO */ | |
83 | unsigned int ena_gpio_invert:1; | |
84 | }; | |
85 | ||
a06ccd9c CK |
86 | /* |
87 | * struct regulator_supply_alias | |
88 | * | |
89 | * Used to map lookups for a supply onto an alternative device. | |
90 | */ | |
91 | struct regulator_supply_alias { | |
92 | struct list_head list; | |
93 | struct device *src_dev; | |
94 | const char *src_supply; | |
95 | struct device *alias_dev; | |
96 | const char *alias_supply; | |
97 | }; | |
98 | ||
414c70cb | 99 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 100 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
101 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
102 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
103 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
104 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
105 | unsigned long event, void *data); | |
75790251 MB |
106 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
107 | int min_uV, int max_uV); | |
3801b86a MB |
108 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
109 | struct device *dev, | |
110 | const char *supply_name); | |
414c70cb | 111 | |
1083c393 MB |
112 | static const char *rdev_get_name(struct regulator_dev *rdev) |
113 | { | |
114 | if (rdev->constraints && rdev->constraints->name) | |
115 | return rdev->constraints->name; | |
116 | else if (rdev->desc->name) | |
117 | return rdev->desc->name; | |
118 | else | |
119 | return ""; | |
120 | } | |
121 | ||
69511a45 RN |
122 | /** |
123 | * of_get_regulator - get a regulator device node based on supply name | |
124 | * @dev: Device pointer for the consumer (of regulator) device | |
125 | * @supply: regulator supply name | |
126 | * | |
127 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 128 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
129 | * returns NULL. |
130 | */ | |
131 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
132 | { | |
133 | struct device_node *regnode = NULL; | |
134 | char prop_name[32]; /* 32 is max size of property name */ | |
135 | ||
136 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
137 | ||
138 | snprintf(prop_name, 32, "%s-supply", supply); | |
139 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
140 | ||
141 | if (!regnode) { | |
16fbcc3b | 142 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
143 | prop_name, dev->of_node->full_name); |
144 | return NULL; | |
145 | } | |
146 | return regnode; | |
147 | } | |
148 | ||
6492bc1b MB |
149 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
150 | { | |
151 | if (!rdev->constraints) | |
152 | return 0; | |
153 | ||
154 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
155 | return 1; | |
156 | else | |
157 | return 0; | |
158 | } | |
159 | ||
414c70cb LG |
160 | /* Platform voltage constraint check */ |
161 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
162 | int *min_uV, int *max_uV) | |
163 | { | |
164 | BUG_ON(*min_uV > *max_uV); | |
165 | ||
166 | if (!rdev->constraints) { | |
5da84fd9 | 167 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
168 | return -ENODEV; |
169 | } | |
170 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 171 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
172 | return -EPERM; |
173 | } | |
174 | ||
175 | if (*max_uV > rdev->constraints->max_uV) | |
176 | *max_uV = rdev->constraints->max_uV; | |
177 | if (*min_uV < rdev->constraints->min_uV) | |
178 | *min_uV = rdev->constraints->min_uV; | |
179 | ||
89f425ed MB |
180 | if (*min_uV > *max_uV) { |
181 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 182 | *min_uV, *max_uV); |
414c70cb | 183 | return -EINVAL; |
89f425ed | 184 | } |
414c70cb LG |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
05fda3b1 TP |
189 | /* Make sure we select a voltage that suits the needs of all |
190 | * regulator consumers | |
191 | */ | |
192 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
193 | int *min_uV, int *max_uV) | |
194 | { | |
195 | struct regulator *regulator; | |
196 | ||
197 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
198 | /* |
199 | * Assume consumers that didn't say anything are OK | |
200 | * with anything in the constraint range. | |
201 | */ | |
202 | if (!regulator->min_uV && !regulator->max_uV) | |
203 | continue; | |
204 | ||
05fda3b1 TP |
205 | if (*max_uV > regulator->max_uV) |
206 | *max_uV = regulator->max_uV; | |
207 | if (*min_uV < regulator->min_uV) | |
208 | *min_uV = regulator->min_uV; | |
209 | } | |
210 | ||
dd8004af | 211 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
212 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
213 | *min_uV, *max_uV); | |
05fda3b1 | 214 | return -EINVAL; |
dd8004af | 215 | } |
05fda3b1 TP |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
414c70cb LG |
220 | /* current constraint check */ |
221 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
222 | int *min_uA, int *max_uA) | |
223 | { | |
224 | BUG_ON(*min_uA > *max_uA); | |
225 | ||
226 | if (!rdev->constraints) { | |
5da84fd9 | 227 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
228 | return -ENODEV; |
229 | } | |
230 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 231 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
232 | return -EPERM; |
233 | } | |
234 | ||
235 | if (*max_uA > rdev->constraints->max_uA) | |
236 | *max_uA = rdev->constraints->max_uA; | |
237 | if (*min_uA < rdev->constraints->min_uA) | |
238 | *min_uA = rdev->constraints->min_uA; | |
239 | ||
89f425ed MB |
240 | if (*min_uA > *max_uA) { |
241 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 242 | *min_uA, *max_uA); |
414c70cb | 243 | return -EINVAL; |
89f425ed | 244 | } |
414c70cb LG |
245 | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* operating mode constraint check */ | |
2c608234 | 250 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 251 | { |
2c608234 | 252 | switch (*mode) { |
e573520b DB |
253 | case REGULATOR_MODE_FAST: |
254 | case REGULATOR_MODE_NORMAL: | |
255 | case REGULATOR_MODE_IDLE: | |
256 | case REGULATOR_MODE_STANDBY: | |
257 | break; | |
258 | default: | |
89f425ed | 259 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
260 | return -EINVAL; |
261 | } | |
262 | ||
414c70cb | 263 | if (!rdev->constraints) { |
5da84fd9 | 264 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
265 | return -ENODEV; |
266 | } | |
267 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 268 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
269 | return -EPERM; |
270 | } | |
2c608234 MB |
271 | |
272 | /* The modes are bitmasks, the most power hungry modes having | |
273 | * the lowest values. If the requested mode isn't supported | |
274 | * try higher modes. */ | |
275 | while (*mode) { | |
276 | if (rdev->constraints->valid_modes_mask & *mode) | |
277 | return 0; | |
278 | *mode /= 2; | |
414c70cb | 279 | } |
2c608234 MB |
280 | |
281 | return -EINVAL; | |
414c70cb LG |
282 | } |
283 | ||
284 | /* dynamic regulator mode switching constraint check */ | |
285 | static int regulator_check_drms(struct regulator_dev *rdev) | |
286 | { | |
287 | if (!rdev->constraints) { | |
5da84fd9 | 288 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
289 | return -ENODEV; |
290 | } | |
291 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 292 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
293 | return -EPERM; |
294 | } | |
295 | return 0; | |
296 | } | |
297 | ||
414c70cb LG |
298 | static ssize_t regulator_uV_show(struct device *dev, |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
a5766f11 | 301 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
302 | ssize_t ret; |
303 | ||
304 | mutex_lock(&rdev->mutex); | |
305 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
306 | mutex_unlock(&rdev->mutex); | |
307 | ||
308 | return ret; | |
309 | } | |
7ad68e2f | 310 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
311 | |
312 | static ssize_t regulator_uA_show(struct device *dev, | |
313 | struct device_attribute *attr, char *buf) | |
314 | { | |
a5766f11 | 315 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
316 | |
317 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
318 | } | |
7ad68e2f | 319 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 320 | |
587cea27 GKH |
321 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
322 | char *buf) | |
bc558a60 MB |
323 | { |
324 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 325 | |
1083c393 | 326 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 327 | } |
587cea27 | 328 | static DEVICE_ATTR_RO(name); |
bc558a60 | 329 | |
4fca9545 | 330 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 331 | { |
414c70cb LG |
332 | switch (mode) { |
333 | case REGULATOR_MODE_FAST: | |
334 | return sprintf(buf, "fast\n"); | |
335 | case REGULATOR_MODE_NORMAL: | |
336 | return sprintf(buf, "normal\n"); | |
337 | case REGULATOR_MODE_IDLE: | |
338 | return sprintf(buf, "idle\n"); | |
339 | case REGULATOR_MODE_STANDBY: | |
340 | return sprintf(buf, "standby\n"); | |
341 | } | |
342 | return sprintf(buf, "unknown\n"); | |
343 | } | |
344 | ||
4fca9545 DB |
345 | static ssize_t regulator_opmode_show(struct device *dev, |
346 | struct device_attribute *attr, char *buf) | |
414c70cb | 347 | { |
a5766f11 | 348 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 349 | |
4fca9545 DB |
350 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
351 | } | |
7ad68e2f | 352 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
353 | |
354 | static ssize_t regulator_print_state(char *buf, int state) | |
355 | { | |
414c70cb LG |
356 | if (state > 0) |
357 | return sprintf(buf, "enabled\n"); | |
358 | else if (state == 0) | |
359 | return sprintf(buf, "disabled\n"); | |
360 | else | |
361 | return sprintf(buf, "unknown\n"); | |
362 | } | |
363 | ||
4fca9545 DB |
364 | static ssize_t regulator_state_show(struct device *dev, |
365 | struct device_attribute *attr, char *buf) | |
366 | { | |
367 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
368 | ssize_t ret; |
369 | ||
370 | mutex_lock(&rdev->mutex); | |
371 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
372 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 373 | |
9332546f | 374 | return ret; |
4fca9545 | 375 | } |
7ad68e2f | 376 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 377 | |
853116a1 DB |
378 | static ssize_t regulator_status_show(struct device *dev, |
379 | struct device_attribute *attr, char *buf) | |
380 | { | |
381 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
382 | int status; | |
383 | char *label; | |
384 | ||
385 | status = rdev->desc->ops->get_status(rdev); | |
386 | if (status < 0) | |
387 | return status; | |
388 | ||
389 | switch (status) { | |
390 | case REGULATOR_STATUS_OFF: | |
391 | label = "off"; | |
392 | break; | |
393 | case REGULATOR_STATUS_ON: | |
394 | label = "on"; | |
395 | break; | |
396 | case REGULATOR_STATUS_ERROR: | |
397 | label = "error"; | |
398 | break; | |
399 | case REGULATOR_STATUS_FAST: | |
400 | label = "fast"; | |
401 | break; | |
402 | case REGULATOR_STATUS_NORMAL: | |
403 | label = "normal"; | |
404 | break; | |
405 | case REGULATOR_STATUS_IDLE: | |
406 | label = "idle"; | |
407 | break; | |
408 | case REGULATOR_STATUS_STANDBY: | |
409 | label = "standby"; | |
410 | break; | |
f59c8f9f MB |
411 | case REGULATOR_STATUS_BYPASS: |
412 | label = "bypass"; | |
413 | break; | |
1beaf762 KG |
414 | case REGULATOR_STATUS_UNDEFINED: |
415 | label = "undefined"; | |
416 | break; | |
853116a1 DB |
417 | default: |
418 | return -ERANGE; | |
419 | } | |
420 | ||
421 | return sprintf(buf, "%s\n", label); | |
422 | } | |
423 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
424 | ||
414c70cb LG |
425 | static ssize_t regulator_min_uA_show(struct device *dev, |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
a5766f11 | 428 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
429 | |
430 | if (!rdev->constraints) | |
431 | return sprintf(buf, "constraint not defined\n"); | |
432 | ||
433 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
434 | } | |
7ad68e2f | 435 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
436 | |
437 | static ssize_t regulator_max_uA_show(struct device *dev, | |
438 | struct device_attribute *attr, char *buf) | |
439 | { | |
a5766f11 | 440 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
441 | |
442 | if (!rdev->constraints) | |
443 | return sprintf(buf, "constraint not defined\n"); | |
444 | ||
445 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
446 | } | |
7ad68e2f | 447 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
448 | |
449 | static ssize_t regulator_min_uV_show(struct device *dev, | |
450 | struct device_attribute *attr, char *buf) | |
451 | { | |
a5766f11 | 452 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
453 | |
454 | if (!rdev->constraints) | |
455 | return sprintf(buf, "constraint not defined\n"); | |
456 | ||
457 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
458 | } | |
7ad68e2f | 459 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
460 | |
461 | static ssize_t regulator_max_uV_show(struct device *dev, | |
462 | struct device_attribute *attr, char *buf) | |
463 | { | |
a5766f11 | 464 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
465 | |
466 | if (!rdev->constraints) | |
467 | return sprintf(buf, "constraint not defined\n"); | |
468 | ||
469 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
470 | } | |
7ad68e2f | 471 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
472 | |
473 | static ssize_t regulator_total_uA_show(struct device *dev, | |
474 | struct device_attribute *attr, char *buf) | |
475 | { | |
a5766f11 | 476 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
477 | struct regulator *regulator; |
478 | int uA = 0; | |
479 | ||
480 | mutex_lock(&rdev->mutex); | |
481 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 482 | uA += regulator->uA_load; |
414c70cb LG |
483 | mutex_unlock(&rdev->mutex); |
484 | return sprintf(buf, "%d\n", uA); | |
485 | } | |
7ad68e2f | 486 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 487 | |
587cea27 GKH |
488 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
489 | char *buf) | |
414c70cb | 490 | { |
a5766f11 | 491 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
492 | return sprintf(buf, "%d\n", rdev->use_count); |
493 | } | |
587cea27 | 494 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 495 | |
587cea27 GKH |
496 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
497 | char *buf) | |
414c70cb | 498 | { |
a5766f11 | 499 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
500 | |
501 | switch (rdev->desc->type) { | |
502 | case REGULATOR_VOLTAGE: | |
503 | return sprintf(buf, "voltage\n"); | |
504 | case REGULATOR_CURRENT: | |
505 | return sprintf(buf, "current\n"); | |
506 | } | |
507 | return sprintf(buf, "unknown\n"); | |
508 | } | |
587cea27 | 509 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
510 | |
511 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
512 | struct device_attribute *attr, char *buf) | |
513 | { | |
a5766f11 | 514 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 515 | |
414c70cb LG |
516 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
517 | } | |
7ad68e2f DB |
518 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
519 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
520 | |
521 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
522 | struct device_attribute *attr, char *buf) | |
523 | { | |
a5766f11 | 524 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 525 | |
414c70cb LG |
526 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
527 | } | |
7ad68e2f DB |
528 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
529 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
530 | |
531 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
532 | struct device_attribute *attr, char *buf) | |
533 | { | |
a5766f11 | 534 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 535 | |
414c70cb LG |
536 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
537 | } | |
7ad68e2f DB |
538 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
539 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 540 | |
414c70cb LG |
541 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
542 | struct device_attribute *attr, char *buf) | |
543 | { | |
a5766f11 | 544 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 545 | |
4fca9545 DB |
546 | return regulator_print_opmode(buf, |
547 | rdev->constraints->state_mem.mode); | |
414c70cb | 548 | } |
7ad68e2f DB |
549 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
550 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
551 | |
552 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
553 | struct device_attribute *attr, char *buf) | |
554 | { | |
a5766f11 | 555 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 556 | |
4fca9545 DB |
557 | return regulator_print_opmode(buf, |
558 | rdev->constraints->state_disk.mode); | |
414c70cb | 559 | } |
7ad68e2f DB |
560 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
561 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
562 | |
563 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
564 | struct device_attribute *attr, char *buf) | |
565 | { | |
a5766f11 | 566 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 567 | |
4fca9545 DB |
568 | return regulator_print_opmode(buf, |
569 | rdev->constraints->state_standby.mode); | |
414c70cb | 570 | } |
7ad68e2f DB |
571 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
572 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
573 | |
574 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
575 | struct device_attribute *attr, char *buf) | |
576 | { | |
a5766f11 | 577 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 578 | |
4fca9545 DB |
579 | return regulator_print_state(buf, |
580 | rdev->constraints->state_mem.enabled); | |
414c70cb | 581 | } |
7ad68e2f DB |
582 | static DEVICE_ATTR(suspend_mem_state, 0444, |
583 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
584 | |
585 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
586 | struct device_attribute *attr, char *buf) | |
587 | { | |
a5766f11 | 588 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 589 | |
4fca9545 DB |
590 | return regulator_print_state(buf, |
591 | rdev->constraints->state_disk.enabled); | |
414c70cb | 592 | } |
7ad68e2f DB |
593 | static DEVICE_ATTR(suspend_disk_state, 0444, |
594 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
595 | |
596 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
597 | struct device_attribute *attr, char *buf) | |
598 | { | |
a5766f11 | 599 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 600 | |
4fca9545 DB |
601 | return regulator_print_state(buf, |
602 | rdev->constraints->state_standby.enabled); | |
414c70cb | 603 | } |
7ad68e2f DB |
604 | static DEVICE_ATTR(suspend_standby_state, 0444, |
605 | regulator_suspend_standby_state_show, NULL); | |
606 | ||
f59c8f9f MB |
607 | static ssize_t regulator_bypass_show(struct device *dev, |
608 | struct device_attribute *attr, char *buf) | |
609 | { | |
610 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
611 | const char *report; | |
612 | bool bypass; | |
613 | int ret; | |
614 | ||
615 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
616 | ||
617 | if (ret != 0) | |
618 | report = "unknown"; | |
619 | else if (bypass) | |
620 | report = "enabled"; | |
621 | else | |
622 | report = "disabled"; | |
623 | ||
624 | return sprintf(buf, "%s\n", report); | |
625 | } | |
626 | static DEVICE_ATTR(bypass, 0444, | |
627 | regulator_bypass_show, NULL); | |
bc558a60 | 628 | |
7ad68e2f DB |
629 | /* |
630 | * These are the only attributes are present for all regulators. | |
631 | * Other attributes are a function of regulator functionality. | |
632 | */ | |
587cea27 GKH |
633 | static struct attribute *regulator_dev_attrs[] = { |
634 | &dev_attr_name.attr, | |
635 | &dev_attr_num_users.attr, | |
636 | &dev_attr_type.attr, | |
637 | NULL, | |
414c70cb | 638 | }; |
587cea27 | 639 | ATTRIBUTE_GROUPS(regulator_dev); |
414c70cb LG |
640 | |
641 | static void regulator_dev_release(struct device *dev) | |
642 | { | |
a5766f11 | 643 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
644 | kfree(rdev); |
645 | } | |
646 | ||
647 | static struct class regulator_class = { | |
648 | .name = "regulator", | |
649 | .dev_release = regulator_dev_release, | |
587cea27 | 650 | .dev_groups = regulator_dev_groups, |
414c70cb LG |
651 | }; |
652 | ||
653 | /* Calculate the new optimum regulator operating mode based on the new total | |
654 | * consumer load. All locks held by caller */ | |
655 | static void drms_uA_update(struct regulator_dev *rdev) | |
656 | { | |
657 | struct regulator *sibling; | |
658 | int current_uA = 0, output_uV, input_uV, err; | |
659 | unsigned int mode; | |
660 | ||
661 | err = regulator_check_drms(rdev); | |
662 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
663 | (!rdev->desc->ops->get_voltage && |
664 | !rdev->desc->ops->get_voltage_sel) || | |
665 | !rdev->desc->ops->set_mode) | |
036de8ef | 666 | return; |
414c70cb LG |
667 | |
668 | /* get output voltage */ | |
1bf5a1f8 | 669 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
670 | if (output_uV <= 0) |
671 | return; | |
672 | ||
673 | /* get input voltage */ | |
1bf5a1f8 MB |
674 | input_uV = 0; |
675 | if (rdev->supply) | |
3f24f5ad | 676 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 677 | if (input_uV <= 0) |
414c70cb LG |
678 | input_uV = rdev->constraints->input_uV; |
679 | if (input_uV <= 0) | |
680 | return; | |
681 | ||
682 | /* calc total requested load */ | |
683 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 684 | current_uA += sibling->uA_load; |
414c70cb LG |
685 | |
686 | /* now get the optimum mode for our new total regulator load */ | |
687 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
688 | output_uV, current_uA); | |
689 | ||
690 | /* check the new mode is allowed */ | |
2c608234 | 691 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
692 | if (err == 0) |
693 | rdev->desc->ops->set_mode(rdev, mode); | |
694 | } | |
695 | ||
696 | static int suspend_set_state(struct regulator_dev *rdev, | |
697 | struct regulator_state *rstate) | |
698 | { | |
699 | int ret = 0; | |
638f85c5 MB |
700 | |
701 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
702 | * only warn if the driver implements set_suspend_voltage or |
703 | * set_suspend_mode callback. | |
638f85c5 MB |
704 | */ |
705 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
706 | if (rdev->desc->ops->set_suspend_voltage || |
707 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 708 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
709 | return 0; |
710 | } | |
711 | ||
712 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 713 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
714 | return -EINVAL; |
715 | } | |
414c70cb | 716 | |
8ac0e95d | 717 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 718 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 719 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 720 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
721 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
722 | ret = 0; | |
723 | ||
414c70cb | 724 | if (ret < 0) { |
5da84fd9 | 725 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
726 | return ret; |
727 | } | |
728 | ||
729 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
730 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
731 | if (ret < 0) { | |
5da84fd9 | 732 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
733 | return ret; |
734 | } | |
735 | } | |
736 | ||
737 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
738 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
739 | if (ret < 0) { | |
5da84fd9 | 740 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
741 | return ret; |
742 | } | |
743 | } | |
744 | return ret; | |
745 | } | |
746 | ||
747 | /* locks held by caller */ | |
748 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
749 | { | |
750 | if (!rdev->constraints) | |
751 | return -EINVAL; | |
752 | ||
753 | switch (state) { | |
754 | case PM_SUSPEND_STANDBY: | |
755 | return suspend_set_state(rdev, | |
756 | &rdev->constraints->state_standby); | |
757 | case PM_SUSPEND_MEM: | |
758 | return suspend_set_state(rdev, | |
759 | &rdev->constraints->state_mem); | |
760 | case PM_SUSPEND_MAX: | |
761 | return suspend_set_state(rdev, | |
762 | &rdev->constraints->state_disk); | |
763 | default: | |
764 | return -EINVAL; | |
765 | } | |
766 | } | |
767 | ||
768 | static void print_constraints(struct regulator_dev *rdev) | |
769 | { | |
770 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 771 | char buf[80] = ""; |
8f031b48 MB |
772 | int count = 0; |
773 | int ret; | |
414c70cb | 774 | |
8f031b48 | 775 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 776 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
777 | count += sprintf(buf + count, "%d mV ", |
778 | constraints->min_uV / 1000); | |
414c70cb | 779 | else |
8f031b48 MB |
780 | count += sprintf(buf + count, "%d <--> %d mV ", |
781 | constraints->min_uV / 1000, | |
782 | constraints->max_uV / 1000); | |
783 | } | |
784 | ||
785 | if (!constraints->min_uV || | |
786 | constraints->min_uV != constraints->max_uV) { | |
787 | ret = _regulator_get_voltage(rdev); | |
788 | if (ret > 0) | |
789 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
790 | } | |
791 | ||
bf5892a8 MB |
792 | if (constraints->uV_offset) |
793 | count += sprintf(buf, "%dmV offset ", | |
794 | constraints->uV_offset / 1000); | |
795 | ||
8f031b48 | 796 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 797 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
798 | count += sprintf(buf + count, "%d mA ", |
799 | constraints->min_uA / 1000); | |
414c70cb | 800 | else |
8f031b48 MB |
801 | count += sprintf(buf + count, "%d <--> %d mA ", |
802 | constraints->min_uA / 1000, | |
803 | constraints->max_uA / 1000); | |
804 | } | |
805 | ||
806 | if (!constraints->min_uA || | |
807 | constraints->min_uA != constraints->max_uA) { | |
808 | ret = _regulator_get_current_limit(rdev); | |
809 | if (ret > 0) | |
e4a6376b | 810 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 811 | } |
8f031b48 | 812 | |
414c70cb LG |
813 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
814 | count += sprintf(buf + count, "fast "); | |
815 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
816 | count += sprintf(buf + count, "normal "); | |
817 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
818 | count += sprintf(buf + count, "idle "); | |
819 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
820 | count += sprintf(buf + count, "standby"); | |
821 | ||
215b8b05 UKK |
822 | if (!count) |
823 | sprintf(buf, "no parameters"); | |
824 | ||
13ce29f8 | 825 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
826 | |
827 | if ((constraints->min_uV != constraints->max_uV) && | |
828 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
829 | rdev_warn(rdev, | |
830 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
831 | } |
832 | ||
e79055d6 | 833 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 834 | struct regulation_constraints *constraints) |
a5766f11 | 835 | { |
e5fda26c | 836 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
837 | int ret; |
838 | ||
839 | /* do we need to apply the constraint voltage */ | |
840 | if (rdev->constraints->apply_uV && | |
75790251 MB |
841 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
842 | ret = _regulator_do_set_voltage(rdev, | |
843 | rdev->constraints->min_uV, | |
844 | rdev->constraints->max_uV); | |
845 | if (ret < 0) { | |
846 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
847 | rdev->constraints->min_uV); | |
75790251 MB |
848 | return ret; |
849 | } | |
af5866c9 | 850 | } |
e06f5b4f | 851 | |
4367cfdc DB |
852 | /* constrain machine-level voltage specs to fit |
853 | * the actual range supported by this regulator. | |
854 | */ | |
855 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
856 | int count = rdev->desc->n_voltages; | |
857 | int i; | |
858 | int min_uV = INT_MAX; | |
859 | int max_uV = INT_MIN; | |
860 | int cmin = constraints->min_uV; | |
861 | int cmax = constraints->max_uV; | |
862 | ||
3e590918 MB |
863 | /* it's safe to autoconfigure fixed-voltage supplies |
864 | and the constraints are used by list_voltage. */ | |
4367cfdc | 865 | if (count == 1 && !cmin) { |
3e590918 | 866 | cmin = 1; |
4367cfdc | 867 | cmax = INT_MAX; |
3e590918 MB |
868 | constraints->min_uV = cmin; |
869 | constraints->max_uV = cmax; | |
4367cfdc DB |
870 | } |
871 | ||
3e2b9abd MB |
872 | /* voltage constraints are optional */ |
873 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 874 | return 0; |
3e2b9abd | 875 | |
4367cfdc | 876 | /* else require explicit machine-level constraints */ |
3e2b9abd | 877 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 878 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 879 | return -EINVAL; |
4367cfdc DB |
880 | } |
881 | ||
882 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
883 | for (i = 0; i < count; i++) { | |
884 | int value; | |
885 | ||
886 | value = ops->list_voltage(rdev, i); | |
887 | if (value <= 0) | |
888 | continue; | |
889 | ||
890 | /* maybe adjust [min_uV..max_uV] */ | |
891 | if (value >= cmin && value < min_uV) | |
892 | min_uV = value; | |
893 | if (value <= cmax && value > max_uV) | |
894 | max_uV = value; | |
895 | } | |
896 | ||
897 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
898 | if (max_uV < min_uV) { | |
fff15bef MB |
899 | rdev_err(rdev, |
900 | "unsupportable voltage constraints %u-%uuV\n", | |
901 | min_uV, max_uV); | |
e79055d6 | 902 | return -EINVAL; |
4367cfdc DB |
903 | } |
904 | ||
905 | /* use regulator's subset of machine constraints */ | |
906 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
907 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
908 | constraints->min_uV, min_uV); | |
4367cfdc DB |
909 | constraints->min_uV = min_uV; |
910 | } | |
911 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
912 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
913 | constraints->max_uV, max_uV); | |
4367cfdc DB |
914 | constraints->max_uV = max_uV; |
915 | } | |
916 | } | |
917 | ||
e79055d6 MB |
918 | return 0; |
919 | } | |
920 | ||
f8c1700d LD |
921 | static int machine_constraints_current(struct regulator_dev *rdev, |
922 | struct regulation_constraints *constraints) | |
923 | { | |
924 | struct regulator_ops *ops = rdev->desc->ops; | |
925 | int ret; | |
926 | ||
927 | if (!constraints->min_uA && !constraints->max_uA) | |
928 | return 0; | |
929 | ||
930 | if (constraints->min_uA > constraints->max_uA) { | |
931 | rdev_err(rdev, "Invalid current constraints\n"); | |
932 | return -EINVAL; | |
933 | } | |
934 | ||
935 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
936 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* Set regulator current in constraints range */ | |
941 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
942 | constraints->max_uA); | |
943 | if (ret < 0) { | |
944 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
945 | return ret; | |
946 | } | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
e79055d6 MB |
951 | /** |
952 | * set_machine_constraints - sets regulator constraints | |
953 | * @rdev: regulator source | |
954 | * @constraints: constraints to apply | |
955 | * | |
956 | * Allows platform initialisation code to define and constrain | |
957 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
958 | * Constraints *must* be set by platform code in order for some | |
959 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
960 | * set_mode. | |
961 | */ | |
962 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 963 | const struct regulation_constraints *constraints) |
e79055d6 MB |
964 | { |
965 | int ret = 0; | |
e79055d6 MB |
966 | struct regulator_ops *ops = rdev->desc->ops; |
967 | ||
9a8f5e07 MB |
968 | if (constraints) |
969 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
970 | GFP_KERNEL); | |
971 | else | |
972 | rdev->constraints = kzalloc(sizeof(*constraints), | |
973 | GFP_KERNEL); | |
f8c12fe3 MB |
974 | if (!rdev->constraints) |
975 | return -ENOMEM; | |
af5866c9 | 976 | |
f8c12fe3 | 977 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
978 | if (ret != 0) |
979 | goto out; | |
980 | ||
f8c1700d | 981 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 MB |
982 | if (ret != 0) |
983 | goto out; | |
984 | ||
a5766f11 | 985 | /* do we need to setup our suspend state */ |
9a8f5e07 | 986 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 987 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 988 | if (ret < 0) { |
5da84fd9 | 989 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
990 | goto out; |
991 | } | |
992 | } | |
a5766f11 | 993 | |
9a8f5e07 | 994 | if (rdev->constraints->initial_mode) { |
a308466c | 995 | if (!ops->set_mode) { |
5da84fd9 | 996 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
997 | ret = -EINVAL; |
998 | goto out; | |
999 | } | |
1000 | ||
f8c12fe3 | 1001 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1002 | if (ret < 0) { |
5da84fd9 | 1003 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
1004 | goto out; |
1005 | } | |
1006 | } | |
1007 | ||
cacf90f2 MB |
1008 | /* If the constraints say the regulator should be on at this point |
1009 | * and we have control then make sure it is enabled. | |
1010 | */ | |
f8c12fe3 MB |
1011 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
1012 | ops->enable) { | |
e5fda26c MB |
1013 | ret = ops->enable(rdev); |
1014 | if (ret < 0) { | |
5da84fd9 | 1015 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
1016 | goto out; |
1017 | } | |
1018 | } | |
1019 | ||
1653ccf4 YSB |
1020 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1021 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1022 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1023 | if (ret < 0) { | |
1024 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
1025 | goto out; | |
1026 | } | |
1027 | } | |
1028 | ||
a5766f11 | 1029 | print_constraints(rdev); |
1a6958e7 | 1030 | return 0; |
a5766f11 | 1031 | out: |
1a6958e7 AL |
1032 | kfree(rdev->constraints); |
1033 | rdev->constraints = NULL; | |
a5766f11 LG |
1034 | return ret; |
1035 | } | |
1036 | ||
1037 | /** | |
1038 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1039 | * @rdev: regulator name |
1040 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1041 | * |
1042 | * Called by platform initialisation code to set the supply regulator for this | |
1043 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1044 | * core if it's child is enabled. | |
1045 | */ | |
1046 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1047 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1048 | { |
1049 | int err; | |
1050 | ||
3801b86a MB |
1051 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1052 | ||
1053 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1054 | if (rdev->supply == NULL) { |
1055 | err = -ENOMEM; | |
3801b86a | 1056 | return err; |
a5766f11 | 1057 | } |
57ad526a | 1058 | supply_rdev->open_count++; |
3801b86a MB |
1059 | |
1060 | return 0; | |
a5766f11 LG |
1061 | } |
1062 | ||
1063 | /** | |
06c63f93 | 1064 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1065 | * @rdev: regulator source |
40f9244f | 1066 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1067 | * @supply: symbolic name for supply |
a5766f11 LG |
1068 | * |
1069 | * Allows platform initialisation code to map physical regulator | |
1070 | * sources to symbolic names for supplies for use by devices. Devices | |
1071 | * should use these symbolic names to request regulators, avoiding the | |
1072 | * need to provide board-specific regulator names as platform data. | |
1073 | */ | |
1074 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1075 | const char *consumer_dev_name, |
1076 | const char *supply) | |
a5766f11 LG |
1077 | { |
1078 | struct regulator_map *node; | |
9ed2099e | 1079 | int has_dev; |
a5766f11 LG |
1080 | |
1081 | if (supply == NULL) | |
1082 | return -EINVAL; | |
1083 | ||
9ed2099e MB |
1084 | if (consumer_dev_name != NULL) |
1085 | has_dev = 1; | |
1086 | else | |
1087 | has_dev = 0; | |
1088 | ||
6001e13c | 1089 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1090 | if (node->dev_name && consumer_dev_name) { |
1091 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1092 | continue; | |
1093 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1094 | continue; |
23b5cc2a JN |
1095 | } |
1096 | ||
6001e13c DB |
1097 | if (strcmp(node->supply, supply) != 0) |
1098 | continue; | |
1099 | ||
737f360d MB |
1100 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1101 | consumer_dev_name, | |
1102 | dev_name(&node->regulator->dev), | |
1103 | node->regulator->desc->name, | |
1104 | supply, | |
1105 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1106 | return -EBUSY; |
1107 | } | |
1108 | ||
9ed2099e | 1109 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1110 | if (node == NULL) |
1111 | return -ENOMEM; | |
1112 | ||
1113 | node->regulator = rdev; | |
a5766f11 LG |
1114 | node->supply = supply; |
1115 | ||
9ed2099e MB |
1116 | if (has_dev) { |
1117 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1118 | if (node->dev_name == NULL) { | |
1119 | kfree(node); | |
1120 | return -ENOMEM; | |
1121 | } | |
40f9244f MB |
1122 | } |
1123 | ||
a5766f11 LG |
1124 | list_add(&node->list, ®ulator_map_list); |
1125 | return 0; | |
1126 | } | |
1127 | ||
0f1d747b MR |
1128 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1129 | { | |
1130 | struct regulator_map *node, *n; | |
1131 | ||
1132 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1133 | if (rdev == node->regulator) { | |
1134 | list_del(&node->list); | |
40f9244f | 1135 | kfree(node->dev_name); |
0f1d747b | 1136 | kfree(node); |
0f1d747b MR |
1137 | } |
1138 | } | |
1139 | } | |
1140 | ||
f5726ae3 | 1141 | #define REG_STR_SIZE 64 |
414c70cb LG |
1142 | |
1143 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1144 | struct device *dev, | |
1145 | const char *supply_name) | |
1146 | { | |
1147 | struct regulator *regulator; | |
1148 | char buf[REG_STR_SIZE]; | |
1149 | int err, size; | |
1150 | ||
1151 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1152 | if (regulator == NULL) | |
1153 | return NULL; | |
1154 | ||
1155 | mutex_lock(&rdev->mutex); | |
1156 | regulator->rdev = rdev; | |
1157 | list_add(®ulator->list, &rdev->consumer_list); | |
1158 | ||
1159 | if (dev) { | |
e2c98eaf SG |
1160 | regulator->dev = dev; |
1161 | ||
222cc7b1 | 1162 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1163 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1164 | dev->kobj.name, supply_name); | |
1165 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1166 | goto overflow_err; |
414c70cb LG |
1167 | |
1168 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1169 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1170 | goto overflow_err; |
414c70cb LG |
1171 | |
1172 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1173 | buf); | |
1174 | if (err) { | |
5da84fd9 JP |
1175 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1176 | dev->kobj.name, err); | |
222cc7b1 | 1177 | /* non-fatal */ |
414c70cb | 1178 | } |
5de70519 MB |
1179 | } else { |
1180 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1181 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1182 | goto overflow_err; |
5de70519 MB |
1183 | } |
1184 | ||
5de70519 MB |
1185 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1186 | rdev->debugfs); | |
24751434 | 1187 | if (!regulator->debugfs) { |
5de70519 | 1188 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1189 | } else { |
1190 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1191 | ®ulator->uA_load); | |
1192 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1193 | ®ulator->min_uV); | |
1194 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1195 | ®ulator->max_uV); | |
414c70cb | 1196 | } |
5de70519 | 1197 | |
6492bc1b MB |
1198 | /* |
1199 | * Check now if the regulator is an always on regulator - if | |
1200 | * it is then we don't need to do nearly so much work for | |
1201 | * enable/disable calls. | |
1202 | */ | |
1203 | if (!_regulator_can_change_status(rdev) && | |
1204 | _regulator_is_enabled(rdev)) | |
1205 | regulator->always_on = true; | |
1206 | ||
414c70cb LG |
1207 | mutex_unlock(&rdev->mutex); |
1208 | return regulator; | |
414c70cb LG |
1209 | overflow_err: |
1210 | list_del(®ulator->list); | |
1211 | kfree(regulator); | |
1212 | mutex_unlock(&rdev->mutex); | |
1213 | return NULL; | |
1214 | } | |
1215 | ||
31aae2be MB |
1216 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1217 | { | |
00c877c6 LD |
1218 | if (rdev->constraints && rdev->constraints->enable_time) |
1219 | return rdev->constraints->enable_time; | |
31aae2be | 1220 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1221 | return rdev->desc->enable_time; |
31aae2be MB |
1222 | return rdev->desc->ops->enable_time(rdev); |
1223 | } | |
1224 | ||
a06ccd9c CK |
1225 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1226 | struct device *dev, const char *supply) | |
1227 | { | |
1228 | struct regulator_supply_alias *map; | |
1229 | ||
1230 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1231 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1232 | return map; | |
1233 | ||
1234 | return NULL; | |
1235 | } | |
1236 | ||
1237 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1238 | { | |
1239 | struct regulator_supply_alias *map; | |
1240 | ||
1241 | map = regulator_find_supply_alias(*dev, *supply); | |
1242 | if (map) { | |
1243 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1244 | *supply, map->alias_supply, | |
1245 | dev_name(map->alias_dev)); | |
1246 | *dev = map->alias_dev; | |
1247 | *supply = map->alias_supply; | |
1248 | } | |
1249 | } | |
1250 | ||
69511a45 | 1251 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1252 | const char *supply, |
1253 | int *ret) | |
69511a45 RN |
1254 | { |
1255 | struct regulator_dev *r; | |
1256 | struct device_node *node; | |
576ca436 MB |
1257 | struct regulator_map *map; |
1258 | const char *devname = NULL; | |
69511a45 | 1259 | |
a06ccd9c CK |
1260 | regulator_supply_alias(&dev, &supply); |
1261 | ||
69511a45 RN |
1262 | /* first do a dt based lookup */ |
1263 | if (dev && dev->of_node) { | |
1264 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1265 | if (node) { |
69511a45 RN |
1266 | list_for_each_entry(r, ®ulator_list, list) |
1267 | if (r->dev.parent && | |
1268 | node == r->dev.of_node) | |
1269 | return r; | |
6d191a5f MB |
1270 | } else { |
1271 | /* | |
1272 | * If we couldn't even get the node then it's | |
1273 | * not just that the device didn't register | |
1274 | * yet, there's no node and we'll never | |
1275 | * succeed. | |
1276 | */ | |
1277 | *ret = -ENODEV; | |
1278 | } | |
69511a45 RN |
1279 | } |
1280 | ||
1281 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1282 | if (dev) |
1283 | devname = dev_name(dev); | |
1284 | ||
69511a45 RN |
1285 | list_for_each_entry(r, ®ulator_list, list) |
1286 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1287 | return r; | |
1288 | ||
576ca436 MB |
1289 | list_for_each_entry(map, ®ulator_map_list, list) { |
1290 | /* If the mapping has a device set up it must match */ | |
1291 | if (map->dev_name && | |
1292 | (!devname || strcmp(map->dev_name, devname))) | |
1293 | continue; | |
1294 | ||
1295 | if (strcmp(map->supply, supply) == 0) | |
1296 | return map->regulator; | |
1297 | } | |
1298 | ||
1299 | ||
69511a45 RN |
1300 | return NULL; |
1301 | } | |
1302 | ||
5ffbd136 MB |
1303 | /* Internal regulator request function */ |
1304 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1305 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1306 | { |
1307 | struct regulator_dev *rdev; | |
04bf3011 | 1308 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1309 | const char *devname = NULL; |
9b92da1f | 1310 | int ret = -EPROBE_DEFER; |
414c70cb LG |
1311 | |
1312 | if (id == NULL) { | |
5da84fd9 | 1313 | pr_err("get() with no identifier\n"); |
043c998f | 1314 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1315 | } |
1316 | ||
40f9244f MB |
1317 | if (dev) |
1318 | devname = dev_name(dev); | |
1319 | ||
414c70cb LG |
1320 | mutex_lock(®ulator_list_mutex); |
1321 | ||
6d191a5f | 1322 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1323 | if (rdev) |
1324 | goto found; | |
1325 | ||
ef60abbb MB |
1326 | regulator = ERR_PTR(ret); |
1327 | ||
1e4b545c NM |
1328 | /* |
1329 | * If we have return value from dev_lookup fail, we do not expect to | |
1330 | * succeed, so, quit with appropriate error value | |
1331 | */ | |
4ddfebd3 | 1332 | if (ret && ret != -ENODEV) { |
1e4b545c NM |
1333 | goto out; |
1334 | } | |
1335 | ||
34abbd68 MB |
1336 | if (!devname) |
1337 | devname = "deviceless"; | |
1338 | ||
4ddfebd3 MB |
1339 | /* |
1340 | * Assume that a regulator is physically present and enabled | |
1341 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1342 | */ |
4ddfebd3 | 1343 | if (has_full_constraints && allow_dummy) { |
5da84fd9 JP |
1344 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1345 | devname, id); | |
4ddfebd3 | 1346 | |
34abbd68 MB |
1347 | rdev = dummy_regulator_rdev; |
1348 | goto found; | |
4ddfebd3 MB |
1349 | } else { |
1350 | dev_err(dev, "dummy supplies not allowed\n"); | |
34abbd68 | 1351 | } |
34abbd68 | 1352 | |
414c70cb LG |
1353 | mutex_unlock(®ulator_list_mutex); |
1354 | return regulator; | |
1355 | ||
1356 | found: | |
5ffbd136 MB |
1357 | if (rdev->exclusive) { |
1358 | regulator = ERR_PTR(-EPERM); | |
1359 | goto out; | |
1360 | } | |
1361 | ||
1362 | if (exclusive && rdev->open_count) { | |
1363 | regulator = ERR_PTR(-EBUSY); | |
1364 | goto out; | |
1365 | } | |
1366 | ||
a5766f11 LG |
1367 | if (!try_module_get(rdev->owner)) |
1368 | goto out; | |
1369 | ||
414c70cb LG |
1370 | regulator = create_regulator(rdev, dev, id); |
1371 | if (regulator == NULL) { | |
1372 | regulator = ERR_PTR(-ENOMEM); | |
1373 | module_put(rdev->owner); | |
bcda4321 | 1374 | goto out; |
414c70cb LG |
1375 | } |
1376 | ||
5ffbd136 MB |
1377 | rdev->open_count++; |
1378 | if (exclusive) { | |
1379 | rdev->exclusive = 1; | |
1380 | ||
1381 | ret = _regulator_is_enabled(rdev); | |
1382 | if (ret > 0) | |
1383 | rdev->use_count = 1; | |
1384 | else | |
1385 | rdev->use_count = 0; | |
1386 | } | |
1387 | ||
a5766f11 | 1388 | out: |
414c70cb | 1389 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1390 | |
414c70cb LG |
1391 | return regulator; |
1392 | } | |
5ffbd136 MB |
1393 | |
1394 | /** | |
1395 | * regulator_get - lookup and obtain a reference to a regulator. | |
1396 | * @dev: device for regulator "consumer" | |
1397 | * @id: Supply name or regulator ID. | |
1398 | * | |
1399 | * Returns a struct regulator corresponding to the regulator producer, | |
1400 | * or IS_ERR() condition containing errno. | |
1401 | * | |
1402 | * Use of supply names configured via regulator_set_device_supply() is | |
1403 | * strongly encouraged. It is recommended that the supply name used | |
1404 | * should match the name used for the supply and/or the relevant | |
1405 | * device pins in the datasheet. | |
1406 | */ | |
1407 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1408 | { | |
4ddfebd3 | 1409 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1410 | } |
414c70cb LG |
1411 | EXPORT_SYMBOL_GPL(regulator_get); |
1412 | ||
5ffbd136 MB |
1413 | /** |
1414 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1415 | * @dev: device for regulator "consumer" | |
1416 | * @id: Supply name or regulator ID. | |
1417 | * | |
1418 | * Returns a struct regulator corresponding to the regulator producer, | |
1419 | * or IS_ERR() condition containing errno. Other consumers will be | |
1420 | * unable to obtain this reference is held and the use count for the | |
1421 | * regulator will be initialised to reflect the current state of the | |
1422 | * regulator. | |
1423 | * | |
1424 | * This is intended for use by consumers which cannot tolerate shared | |
1425 | * use of the regulator such as those which need to force the | |
1426 | * regulator off for correct operation of the hardware they are | |
1427 | * controlling. | |
1428 | * | |
1429 | * Use of supply names configured via regulator_set_device_supply() is | |
1430 | * strongly encouraged. It is recommended that the supply name used | |
1431 | * should match the name used for the supply and/or the relevant | |
1432 | * device pins in the datasheet. | |
1433 | */ | |
1434 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1435 | { | |
4ddfebd3 | 1436 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1437 | } |
1438 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1439 | ||
de1dd9fd MB |
1440 | /** |
1441 | * regulator_get_optional - obtain optional access to a regulator. | |
1442 | * @dev: device for regulator "consumer" | |
1443 | * @id: Supply name or regulator ID. | |
1444 | * | |
1445 | * Returns a struct regulator corresponding to the regulator producer, | |
1446 | * or IS_ERR() condition containing errno. Other consumers will be | |
1447 | * unable to obtain this reference is held and the use count for the | |
1448 | * regulator will be initialised to reflect the current state of the | |
1449 | * regulator. | |
1450 | * | |
1451 | * This is intended for use by consumers for devices which can have | |
1452 | * some supplies unconnected in normal use, such as some MMC devices. | |
1453 | * It can allow the regulator core to provide stub supplies for other | |
1454 | * supplies requested using normal regulator_get() calls without | |
1455 | * disrupting the operation of drivers that can handle absent | |
1456 | * supplies. | |
1457 | * | |
1458 | * Use of supply names configured via regulator_set_device_supply() is | |
1459 | * strongly encouraged. It is recommended that the supply name used | |
1460 | * should match the name used for the supply and/or the relevant | |
1461 | * device pins in the datasheet. | |
1462 | */ | |
1463 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1464 | { | |
4ddfebd3 | 1465 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1466 | } |
1467 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1468 | ||
23ff2f0f CK |
1469 | /* Locks held by regulator_put() */ |
1470 | static void _regulator_put(struct regulator *regulator) | |
414c70cb LG |
1471 | { |
1472 | struct regulator_dev *rdev; | |
1473 | ||
1474 | if (regulator == NULL || IS_ERR(regulator)) | |
1475 | return; | |
1476 | ||
414c70cb LG |
1477 | rdev = regulator->rdev; |
1478 | ||
5de70519 | 1479 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1480 | |
414c70cb | 1481 | /* remove any sysfs entries */ |
e2c98eaf | 1482 | if (regulator->dev) |
414c70cb | 1483 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
5de70519 | 1484 | kfree(regulator->supply_name); |
414c70cb LG |
1485 | list_del(®ulator->list); |
1486 | kfree(regulator); | |
1487 | ||
5ffbd136 MB |
1488 | rdev->open_count--; |
1489 | rdev->exclusive = 0; | |
1490 | ||
414c70cb | 1491 | module_put(rdev->owner); |
23ff2f0f CK |
1492 | } |
1493 | ||
1494 | /** | |
1495 | * regulator_put - "free" the regulator source | |
1496 | * @regulator: regulator source | |
1497 | * | |
1498 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1499 | * regulator source are balanced by regulator_disable calls prior to calling | |
1500 | * this function. | |
1501 | */ | |
1502 | void regulator_put(struct regulator *regulator) | |
1503 | { | |
1504 | mutex_lock(®ulator_list_mutex); | |
1505 | _regulator_put(regulator); | |
414c70cb LG |
1506 | mutex_unlock(®ulator_list_mutex); |
1507 | } | |
1508 | EXPORT_SYMBOL_GPL(regulator_put); | |
1509 | ||
a06ccd9c CK |
1510 | /** |
1511 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1512 | * | |
1513 | * @dev: device that will be given as the regulator "consumer" | |
1514 | * @id: Supply name or regulator ID | |
1515 | * @alias_dev: device that should be used to lookup the supply | |
1516 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1517 | * supply | |
1518 | * | |
1519 | * All lookups for id on dev will instead be conducted for alias_id on | |
1520 | * alias_dev. | |
1521 | */ | |
1522 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1523 | struct device *alias_dev, | |
1524 | const char *alias_id) | |
1525 | { | |
1526 | struct regulator_supply_alias *map; | |
1527 | ||
1528 | map = regulator_find_supply_alias(dev, id); | |
1529 | if (map) | |
1530 | return -EEXIST; | |
1531 | ||
1532 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1533 | if (!map) | |
1534 | return -ENOMEM; | |
1535 | ||
1536 | map->src_dev = dev; | |
1537 | map->src_supply = id; | |
1538 | map->alias_dev = alias_dev; | |
1539 | map->alias_supply = alias_id; | |
1540 | ||
1541 | list_add(&map->list, ®ulator_supply_alias_list); | |
1542 | ||
1543 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1544 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1545 | ||
1546 | return 0; | |
1547 | } | |
1548 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1549 | ||
1550 | /** | |
1551 | * regulator_unregister_supply_alias - Remove device alias | |
1552 | * | |
1553 | * @dev: device that will be given as the regulator "consumer" | |
1554 | * @id: Supply name or regulator ID | |
1555 | * | |
1556 | * Remove a lookup alias if one exists for id on dev. | |
1557 | */ | |
1558 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1559 | { | |
1560 | struct regulator_supply_alias *map; | |
1561 | ||
1562 | map = regulator_find_supply_alias(dev, id); | |
1563 | if (map) { | |
1564 | list_del(&map->list); | |
1565 | kfree(map); | |
1566 | } | |
1567 | } | |
1568 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1569 | ||
1570 | /** | |
1571 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1572 | * | |
1573 | * @dev: device that will be given as the regulator "consumer" | |
1574 | * @id: List of supply names or regulator IDs | |
1575 | * @alias_dev: device that should be used to lookup the supply | |
1576 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1577 | * lookup the supply | |
1578 | * @num_id: Number of aliases to register | |
1579 | * | |
1580 | * @return 0 on success, an errno on failure. | |
1581 | * | |
1582 | * This helper function allows drivers to register several supply | |
1583 | * aliases in one operation. If any of the aliases cannot be | |
1584 | * registered any aliases that were registered will be removed | |
1585 | * before returning to the caller. | |
1586 | */ | |
1587 | int regulator_bulk_register_supply_alias(struct device *dev, const char **id, | |
1588 | struct device *alias_dev, | |
1589 | const char **alias_id, | |
1590 | int num_id) | |
1591 | { | |
1592 | int i; | |
1593 | int ret; | |
1594 | ||
1595 | for (i = 0; i < num_id; ++i) { | |
1596 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1597 | alias_id[i]); | |
1598 | if (ret < 0) | |
1599 | goto err; | |
1600 | } | |
1601 | ||
1602 | return 0; | |
1603 | ||
1604 | err: | |
1605 | dev_err(dev, | |
1606 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1607 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1608 | ||
1609 | while (--i >= 0) | |
1610 | regulator_unregister_supply_alias(dev, id[i]); | |
1611 | ||
1612 | return ret; | |
1613 | } | |
1614 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1615 | ||
1616 | /** | |
1617 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1618 | * | |
1619 | * @dev: device that will be given as the regulator "consumer" | |
1620 | * @id: List of supply names or regulator IDs | |
1621 | * @num_id: Number of aliases to unregister | |
1622 | * | |
1623 | * This helper function allows drivers to unregister several supply | |
1624 | * aliases in one operation. | |
1625 | */ | |
1626 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
1627 | const char **id, | |
1628 | int num_id) | |
1629 | { | |
1630 | int i; | |
1631 | ||
1632 | for (i = 0; i < num_id; ++i) | |
1633 | regulator_unregister_supply_alias(dev, id[i]); | |
1634 | } | |
1635 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1636 | ||
1637 | ||
f19b00da KM |
1638 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1639 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1640 | const struct regulator_config *config) | |
1641 | { | |
1642 | struct regulator_enable_gpio *pin; | |
1643 | int ret; | |
1644 | ||
1645 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { | |
1646 | if (pin->gpio == config->ena_gpio) { | |
1647 | rdev_dbg(rdev, "GPIO %d is already used\n", | |
1648 | config->ena_gpio); | |
1649 | goto update_ena_gpio_to_rdev; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | ret = gpio_request_one(config->ena_gpio, | |
1654 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1655 | rdev_get_name(rdev)); | |
1656 | if (ret) | |
1657 | return ret; | |
1658 | ||
1659 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1660 | if (pin == NULL) { | |
1661 | gpio_free(config->ena_gpio); | |
1662 | return -ENOMEM; | |
1663 | } | |
1664 | ||
1665 | pin->gpio = config->ena_gpio; | |
1666 | pin->ena_gpio_invert = config->ena_gpio_invert; | |
1667 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1668 | ||
1669 | update_ena_gpio_to_rdev: | |
1670 | pin->request_count++; | |
1671 | rdev->ena_pin = pin; | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1676 | { | |
1677 | struct regulator_enable_gpio *pin, *n; | |
1678 | ||
1679 | if (!rdev->ena_pin) | |
1680 | return; | |
1681 | ||
1682 | /* Free the GPIO only in case of no use */ | |
1683 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
1684 | if (pin->gpio == rdev->ena_pin->gpio) { | |
1685 | if (pin->request_count <= 1) { | |
1686 | pin->request_count = 0; | |
1687 | gpio_free(pin->gpio); | |
1688 | list_del(&pin->list); | |
1689 | kfree(pin); | |
1690 | } else { | |
1691 | pin->request_count--; | |
1692 | } | |
1693 | } | |
1694 | } | |
1695 | } | |
1696 | ||
967cfb18 | 1697 | /** |
31d6eebf RD |
1698 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1699 | * @rdev: regulator_dev structure | |
1700 | * @enable: enable GPIO at initial use? | |
1701 | * | |
967cfb18 KM |
1702 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1703 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1704 | */ | |
1705 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1706 | { | |
1707 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1708 | ||
1709 | if (!pin) | |
1710 | return -EINVAL; | |
1711 | ||
1712 | if (enable) { | |
1713 | /* Enable GPIO at initial use */ | |
1714 | if (pin->enable_count == 0) | |
1715 | gpio_set_value_cansleep(pin->gpio, | |
1716 | !pin->ena_gpio_invert); | |
1717 | ||
1718 | pin->enable_count++; | |
1719 | } else { | |
1720 | if (pin->enable_count > 1) { | |
1721 | pin->enable_count--; | |
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | /* Disable GPIO if not used */ | |
1726 | if (pin->enable_count <= 1) { | |
1727 | gpio_set_value_cansleep(pin->gpio, | |
1728 | pin->ena_gpio_invert); | |
1729 | pin->enable_count = 0; | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | return 0; | |
1734 | } | |
1735 | ||
5c5659d0 MB |
1736 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1737 | { | |
1738 | int ret, delay; | |
1739 | ||
1740 | /* Query before enabling in case configuration dependent. */ | |
1741 | ret = _regulator_get_enable_time(rdev); | |
1742 | if (ret >= 0) { | |
1743 | delay = ret; | |
1744 | } else { | |
1745 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1746 | delay = 0; | |
1747 | } | |
1748 | ||
1749 | trace_regulator_enable(rdev_get_name(rdev)); | |
1750 | ||
967cfb18 KM |
1751 | if (rdev->ena_pin) { |
1752 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1753 | if (ret < 0) | |
1754 | return ret; | |
65f73508 MB |
1755 | rdev->ena_gpio_state = 1; |
1756 | } else if (rdev->desc->ops->enable) { | |
5c5659d0 MB |
1757 | ret = rdev->desc->ops->enable(rdev); |
1758 | if (ret < 0) | |
1759 | return ret; | |
1760 | } else { | |
1761 | return -EINVAL; | |
1762 | } | |
1763 | ||
1764 | /* Allow the regulator to ramp; it would be useful to extend | |
1765 | * this for bulk operations so that the regulators can ramp | |
1766 | * together. */ | |
1767 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1768 | ||
5df529d4 TR |
1769 | /* |
1770 | * Delay for the requested amount of time as per the guidelines in: | |
1771 | * | |
1772 | * Documentation/timers/timers-howto.txt | |
1773 | * | |
1774 | * The assumption here is that regulators will never be enabled in | |
1775 | * atomic context and therefore sleeping functions can be used. | |
1776 | */ | |
1777 | if (delay) { | |
1778 | unsigned int ms = delay / 1000; | |
1779 | unsigned int us = delay % 1000; | |
1780 | ||
1781 | if (ms > 0) { | |
1782 | /* | |
1783 | * For small enough values, handle super-millisecond | |
1784 | * delays in the usleep_range() call below. | |
1785 | */ | |
1786 | if (ms < 20) | |
1787 | us += ms * 1000; | |
1788 | else | |
1789 | msleep(ms); | |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Give the scheduler some room to coalesce with any other | |
1794 | * wakeup sources. For delays shorter than 10 us, don't even | |
1795 | * bother setting up high-resolution timers and just busy- | |
1796 | * loop. | |
1797 | */ | |
1798 | if (us >= 10) | |
1799 | usleep_range(us, us + 100); | |
1800 | else | |
1801 | udelay(us); | |
5c5659d0 MB |
1802 | } |
1803 | ||
1804 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1805 | ||
1806 | return 0; | |
1807 | } | |
1808 | ||
414c70cb LG |
1809 | /* locks held by regulator_enable() */ |
1810 | static int _regulator_enable(struct regulator_dev *rdev) | |
1811 | { | |
5c5659d0 | 1812 | int ret; |
414c70cb | 1813 | |
414c70cb | 1814 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1815 | if (rdev->constraints && |
1816 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1817 | drms_uA_update(rdev); | |
414c70cb | 1818 | |
9a2372fa MB |
1819 | if (rdev->use_count == 0) { |
1820 | /* The regulator may on if it's not switchable or left on */ | |
1821 | ret = _regulator_is_enabled(rdev); | |
1822 | if (ret == -EINVAL || ret == 0) { | |
1823 | if (!_regulator_can_change_status(rdev)) | |
1824 | return -EPERM; | |
1825 | ||
5c5659d0 | 1826 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1827 | if (ret < 0) |
1828 | return ret; | |
1829 | ||
a7433cff | 1830 | } else if (ret < 0) { |
5da84fd9 | 1831 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1832 | return ret; |
1833 | } | |
a7433cff | 1834 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1835 | } |
1836 | ||
9a2372fa MB |
1837 | rdev->use_count++; |
1838 | ||
1839 | return 0; | |
414c70cb LG |
1840 | } |
1841 | ||
1842 | /** | |
1843 | * regulator_enable - enable regulator output | |
1844 | * @regulator: regulator source | |
1845 | * | |
cf7bbcdf MB |
1846 | * Request that the regulator be enabled with the regulator output at |
1847 | * the predefined voltage or current value. Calls to regulator_enable() | |
1848 | * must be balanced with calls to regulator_disable(). | |
1849 | * | |
414c70cb | 1850 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1851 | * hardwired in the regulator. |
414c70cb LG |
1852 | */ |
1853 | int regulator_enable(struct regulator *regulator) | |
1854 | { | |
412aec61 DB |
1855 | struct regulator_dev *rdev = regulator->rdev; |
1856 | int ret = 0; | |
414c70cb | 1857 | |
6492bc1b MB |
1858 | if (regulator->always_on) |
1859 | return 0; | |
1860 | ||
3801b86a MB |
1861 | if (rdev->supply) { |
1862 | ret = regulator_enable(rdev->supply); | |
1863 | if (ret != 0) | |
1864 | return ret; | |
1865 | } | |
1866 | ||
412aec61 | 1867 | mutex_lock(&rdev->mutex); |
cd94b505 | 1868 | ret = _regulator_enable(rdev); |
412aec61 | 1869 | mutex_unlock(&rdev->mutex); |
3801b86a | 1870 | |
d1685e4e | 1871 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1872 | regulator_disable(rdev->supply); |
1873 | ||
414c70cb LG |
1874 | return ret; |
1875 | } | |
1876 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1877 | ||
5c5659d0 MB |
1878 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1879 | { | |
1880 | int ret; | |
1881 | ||
1882 | trace_regulator_disable(rdev_get_name(rdev)); | |
1883 | ||
967cfb18 KM |
1884 | if (rdev->ena_pin) { |
1885 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
1886 | if (ret < 0) | |
1887 | return ret; | |
5c5659d0 MB |
1888 | rdev->ena_gpio_state = 0; |
1889 | ||
1890 | } else if (rdev->desc->ops->disable) { | |
1891 | ret = rdev->desc->ops->disable(rdev); | |
1892 | if (ret != 0) | |
1893 | return ret; | |
1894 | } | |
1895 | ||
1896 | trace_regulator_disable_complete(rdev_get_name(rdev)); | |
1897 | ||
1898 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1899 | NULL); | |
1900 | return 0; | |
1901 | } | |
1902 | ||
414c70cb | 1903 | /* locks held by regulator_disable() */ |
3801b86a | 1904 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1905 | { |
1906 | int ret = 0; | |
1907 | ||
cd94b505 | 1908 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1909 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1910 | return -EIO; |
1911 | ||
414c70cb | 1912 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1913 | if (rdev->use_count == 1 && |
1914 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1915 | |
1916 | /* we are last user */ | |
5c5659d0 MB |
1917 | if (_regulator_can_change_status(rdev)) { |
1918 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1919 | if (ret < 0) { |
5da84fd9 | 1920 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1921 | return ret; |
1922 | } | |
1923 | } | |
1924 | ||
414c70cb LG |
1925 | rdev->use_count = 0; |
1926 | } else if (rdev->use_count > 1) { | |
1927 | ||
1928 | if (rdev->constraints && | |
1929 | (rdev->constraints->valid_ops_mask & | |
1930 | REGULATOR_CHANGE_DRMS)) | |
1931 | drms_uA_update(rdev); | |
1932 | ||
1933 | rdev->use_count--; | |
1934 | } | |
3801b86a | 1935 | |
414c70cb LG |
1936 | return ret; |
1937 | } | |
1938 | ||
1939 | /** | |
1940 | * regulator_disable - disable regulator output | |
1941 | * @regulator: regulator source | |
1942 | * | |
cf7bbcdf MB |
1943 | * Disable the regulator output voltage or current. Calls to |
1944 | * regulator_enable() must be balanced with calls to | |
1945 | * regulator_disable(). | |
69279fb9 | 1946 | * |
414c70cb | 1947 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1948 | * devices have it enabled, the regulator device supports disabling and |
1949 | * machine constraints permit this operation. | |
414c70cb LG |
1950 | */ |
1951 | int regulator_disable(struct regulator *regulator) | |
1952 | { | |
412aec61 DB |
1953 | struct regulator_dev *rdev = regulator->rdev; |
1954 | int ret = 0; | |
414c70cb | 1955 | |
6492bc1b MB |
1956 | if (regulator->always_on) |
1957 | return 0; | |
1958 | ||
412aec61 | 1959 | mutex_lock(&rdev->mutex); |
3801b86a | 1960 | ret = _regulator_disable(rdev); |
412aec61 | 1961 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1962 | |
3801b86a MB |
1963 | if (ret == 0 && rdev->supply) |
1964 | regulator_disable(rdev->supply); | |
8cbf811d | 1965 | |
414c70cb LG |
1966 | return ret; |
1967 | } | |
1968 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1969 | ||
1970 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1971 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1972 | { |
1973 | int ret = 0; | |
1974 | ||
1975 | /* force disable */ | |
1976 | if (rdev->desc->ops->disable) { | |
1977 | /* ah well, who wants to live forever... */ | |
1978 | ret = rdev->desc->ops->disable(rdev); | |
1979 | if (ret < 0) { | |
5da84fd9 | 1980 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1981 | return ret; |
1982 | } | |
1983 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1984 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1985 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1986 | } |
1987 | ||
414c70cb LG |
1988 | return ret; |
1989 | } | |
1990 | ||
1991 | /** | |
1992 | * regulator_force_disable - force disable regulator output | |
1993 | * @regulator: regulator source | |
1994 | * | |
1995 | * Forcibly disable the regulator output voltage or current. | |
1996 | * NOTE: this *will* disable the regulator output even if other consumer | |
1997 | * devices have it enabled. This should be used for situations when device | |
1998 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1999 | */ | |
2000 | int regulator_force_disable(struct regulator *regulator) | |
2001 | { | |
82d15839 | 2002 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2003 | int ret; |
2004 | ||
82d15839 | 2005 | mutex_lock(&rdev->mutex); |
414c70cb | 2006 | regulator->uA_load = 0; |
3801b86a | 2007 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2008 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2009 | |
3801b86a MB |
2010 | if (rdev->supply) |
2011 | while (rdev->open_count--) | |
2012 | regulator_disable(rdev->supply); | |
8cbf811d | 2013 | |
414c70cb LG |
2014 | return ret; |
2015 | } | |
2016 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2017 | ||
da07ecd9 MB |
2018 | static void regulator_disable_work(struct work_struct *work) |
2019 | { | |
2020 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2021 | disable_work.work); | |
2022 | int count, i, ret; | |
2023 | ||
2024 | mutex_lock(&rdev->mutex); | |
2025 | ||
2026 | BUG_ON(!rdev->deferred_disables); | |
2027 | ||
2028 | count = rdev->deferred_disables; | |
2029 | rdev->deferred_disables = 0; | |
2030 | ||
2031 | for (i = 0; i < count; i++) { | |
2032 | ret = _regulator_disable(rdev); | |
2033 | if (ret != 0) | |
2034 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2035 | } | |
2036 | ||
2037 | mutex_unlock(&rdev->mutex); | |
2038 | ||
2039 | if (rdev->supply) { | |
2040 | for (i = 0; i < count; i++) { | |
2041 | ret = regulator_disable(rdev->supply); | |
2042 | if (ret != 0) { | |
2043 | rdev_err(rdev, | |
2044 | "Supply disable failed: %d\n", ret); | |
2045 | } | |
2046 | } | |
2047 | } | |
2048 | } | |
2049 | ||
2050 | /** | |
2051 | * regulator_disable_deferred - disable regulator output with delay | |
2052 | * @regulator: regulator source | |
2053 | * @ms: miliseconds until the regulator is disabled | |
2054 | * | |
2055 | * Execute regulator_disable() on the regulator after a delay. This | |
2056 | * is intended for use with devices that require some time to quiesce. | |
2057 | * | |
2058 | * NOTE: this will only disable the regulator output if no other consumer | |
2059 | * devices have it enabled, the regulator device supports disabling and | |
2060 | * machine constraints permit this operation. | |
2061 | */ | |
2062 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2063 | { | |
2064 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 2065 | int ret; |
da07ecd9 | 2066 | |
6492bc1b MB |
2067 | if (regulator->always_on) |
2068 | return 0; | |
2069 | ||
2b5a24a0 MB |
2070 | if (!ms) |
2071 | return regulator_disable(regulator); | |
2072 | ||
da07ecd9 MB |
2073 | mutex_lock(&rdev->mutex); |
2074 | rdev->deferred_disables++; | |
2075 | mutex_unlock(&rdev->mutex); | |
2076 | ||
070260f0 MB |
2077 | ret = queue_delayed_work(system_power_efficient_wq, |
2078 | &rdev->disable_work, | |
2079 | msecs_to_jiffies(ms)); | |
aa59802d MB |
2080 | if (ret < 0) |
2081 | return ret; | |
2082 | else | |
2083 | return 0; | |
da07ecd9 MB |
2084 | } |
2085 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2086 | ||
414c70cb LG |
2087 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2088 | { | |
65f73508 | 2089 | /* A GPIO control always takes precedence */ |
7b74d149 | 2090 | if (rdev->ena_pin) |
65f73508 MB |
2091 | return rdev->ena_gpio_state; |
2092 | ||
9a7f6a4c | 2093 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2094 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2095 | return 1; |
414c70cb | 2096 | |
9332546f | 2097 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2098 | } |
2099 | ||
2100 | /** | |
2101 | * regulator_is_enabled - is the regulator output enabled | |
2102 | * @regulator: regulator source | |
2103 | * | |
412aec61 DB |
2104 | * Returns positive if the regulator driver backing the source/client |
2105 | * has requested that the device be enabled, zero if it hasn't, else a | |
2106 | * negative errno code. | |
2107 | * | |
2108 | * Note that the device backing this regulator handle can have multiple | |
2109 | * users, so it might be enabled even if regulator_enable() was never | |
2110 | * called for this particular source. | |
414c70cb LG |
2111 | */ |
2112 | int regulator_is_enabled(struct regulator *regulator) | |
2113 | { | |
9332546f MB |
2114 | int ret; |
2115 | ||
6492bc1b MB |
2116 | if (regulator->always_on) |
2117 | return 1; | |
2118 | ||
9332546f MB |
2119 | mutex_lock(®ulator->rdev->mutex); |
2120 | ret = _regulator_is_enabled(regulator->rdev); | |
2121 | mutex_unlock(®ulator->rdev->mutex); | |
2122 | ||
2123 | return ret; | |
414c70cb LG |
2124 | } |
2125 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2126 | ||
d1e7de30 MS |
2127 | /** |
2128 | * regulator_can_change_voltage - check if regulator can change voltage | |
2129 | * @regulator: regulator source | |
2130 | * | |
2131 | * Returns positive if the regulator driver backing the source/client | |
2132 | * can change its voltage, false otherwise. Usefull for detecting fixed | |
2133 | * or dummy regulators and disabling voltage change logic in the client | |
2134 | * driver. | |
2135 | */ | |
2136 | int regulator_can_change_voltage(struct regulator *regulator) | |
2137 | { | |
2138 | struct regulator_dev *rdev = regulator->rdev; | |
2139 | ||
2140 | if (rdev->constraints && | |
19280e40 AL |
2141 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2142 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2143 | return 1; | |
2144 | ||
2145 | if (rdev->desc->continuous_voltage_range && | |
2146 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2147 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2148 | return 1; | |
2149 | } | |
d1e7de30 MS |
2150 | |
2151 | return 0; | |
2152 | } | |
2153 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2154 | ||
4367cfdc DB |
2155 | /** |
2156 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2157 | * @regulator: regulator source | |
2158 | * | |
2159 | * Returns number of selectors, or negative errno. Selectors are | |
2160 | * numbered starting at zero, and typically correspond to bitfields | |
2161 | * in hardware registers. | |
2162 | */ | |
2163 | int regulator_count_voltages(struct regulator *regulator) | |
2164 | { | |
2165 | struct regulator_dev *rdev = regulator->rdev; | |
2166 | ||
2167 | return rdev->desc->n_voltages ? : -EINVAL; | |
2168 | } | |
2169 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2170 | ||
2171 | /** | |
2172 | * regulator_list_voltage - enumerate supported voltages | |
2173 | * @regulator: regulator source | |
2174 | * @selector: identify voltage to list | |
2175 | * Context: can sleep | |
2176 | * | |
2177 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2178 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2179 | * negative errno. |
2180 | */ | |
2181 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2182 | { | |
2183 | struct regulator_dev *rdev = regulator->rdev; | |
2184 | struct regulator_ops *ops = rdev->desc->ops; | |
2185 | int ret; | |
2186 | ||
f446043f GL |
2187 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) |
2188 | return rdev->desc->fixed_uV; | |
2189 | ||
4367cfdc DB |
2190 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) |
2191 | return -EINVAL; | |
2192 | ||
2193 | mutex_lock(&rdev->mutex); | |
2194 | ret = ops->list_voltage(rdev, selector); | |
2195 | mutex_unlock(&rdev->mutex); | |
2196 | ||
2197 | if (ret > 0) { | |
2198 | if (ret < rdev->constraints->min_uV) | |
2199 | ret = 0; | |
2200 | else if (ret > rdev->constraints->max_uV) | |
2201 | ret = 0; | |
2202 | } | |
2203 | ||
2204 | return ret; | |
2205 | } | |
2206 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2207 | ||
2a668a8b PW |
2208 | /** |
2209 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2210 | * @regulator: regulator source | |
2211 | * | |
2212 | * Returns the voltage step size between VSEL values for linear | |
2213 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2214 | */ | |
2215 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2216 | { | |
2217 | struct regulator_dev *rdev = regulator->rdev; | |
2218 | ||
2219 | return rdev->desc->uV_step; | |
2220 | } | |
2221 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2222 | ||
a7a1ad90 MB |
2223 | /** |
2224 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2225 | * | |
2226 | * @regulator: Regulator to check. | |
2227 | * @min_uV: Minimum required voltage in uV. | |
2228 | * @max_uV: Maximum required voltage in uV. | |
2229 | * | |
2230 | * Returns a boolean or a negative error code. | |
2231 | */ | |
2232 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2233 | int min_uV, int max_uV) | |
2234 | { | |
c5f3939b | 2235 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2236 | int i, voltages, ret; |
2237 | ||
c5f3939b MB |
2238 | /* If we can't change voltage check the current voltage */ |
2239 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2240 | ret = regulator_get_voltage(regulator); | |
2241 | if (ret >= 0) | |
f0f98b19 | 2242 | return (min_uV <= ret && ret <= max_uV); |
c5f3939b MB |
2243 | else |
2244 | return ret; | |
2245 | } | |
2246 | ||
bd7a2b60 PM |
2247 | /* Any voltage within constrains range is fine? */ |
2248 | if (rdev->desc->continuous_voltage_range) | |
2249 | return min_uV >= rdev->constraints->min_uV && | |
2250 | max_uV <= rdev->constraints->max_uV; | |
2251 | ||
a7a1ad90 MB |
2252 | ret = regulator_count_voltages(regulator); |
2253 | if (ret < 0) | |
2254 | return ret; | |
2255 | voltages = ret; | |
2256 | ||
2257 | for (i = 0; i < voltages; i++) { | |
2258 | ret = regulator_list_voltage(regulator, i); | |
2259 | ||
2260 | if (ret >= min_uV && ret <= max_uV) | |
2261 | return 1; | |
2262 | } | |
2263 | ||
2264 | return 0; | |
2265 | } | |
a398eaa2 | 2266 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2267 | |
75790251 MB |
2268 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2269 | int min_uV, int max_uV) | |
2270 | { | |
2271 | int ret; | |
77af1b26 | 2272 | int delay = 0; |
e113d792 | 2273 | int best_val = 0; |
75790251 | 2274 | unsigned int selector; |
eba41a5e | 2275 | int old_selector = -1; |
75790251 MB |
2276 | |
2277 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2278 | ||
bf5892a8 MB |
2279 | min_uV += rdev->constraints->uV_offset; |
2280 | max_uV += rdev->constraints->uV_offset; | |
2281 | ||
eba41a5e AL |
2282 | /* |
2283 | * If we can't obtain the old selector there is not enough | |
2284 | * info to call set_voltage_time_sel(). | |
2285 | */ | |
8b7485ef AL |
2286 | if (_regulator_is_enabled(rdev) && |
2287 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2288 | rdev->desc->ops->get_voltage_sel) { |
2289 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2290 | if (old_selector < 0) | |
2291 | return old_selector; | |
2292 | } | |
2293 | ||
75790251 MB |
2294 | if (rdev->desc->ops->set_voltage) { |
2295 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2296 | &selector); | |
e113d792 MB |
2297 | |
2298 | if (ret >= 0) { | |
2299 | if (rdev->desc->ops->list_voltage) | |
2300 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2301 | selector); | |
2302 | else | |
2303 | best_val = _regulator_get_voltage(rdev); | |
2304 | } | |
2305 | ||
e8eef82b | 2306 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2307 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2308 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2309 | max_uV); | |
9152c36a AL |
2310 | } else { |
2311 | if (rdev->desc->ops->list_voltage == | |
2312 | regulator_list_voltage_linear) | |
2313 | ret = regulator_map_voltage_linear(rdev, | |
2314 | min_uV, max_uV); | |
2315 | else | |
2316 | ret = regulator_map_voltage_iterate(rdev, | |
2317 | min_uV, max_uV); | |
2318 | } | |
e8eef82b | 2319 | |
e843fc46 | 2320 | if (ret >= 0) { |
e113d792 MB |
2321 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2322 | if (min_uV <= best_val && max_uV >= best_val) { | |
2323 | selector = ret; | |
c66a566a AL |
2324 | if (old_selector == selector) |
2325 | ret = 0; | |
2326 | else | |
2327 | ret = rdev->desc->ops->set_voltage_sel( | |
2328 | rdev, ret); | |
e113d792 MB |
2329 | } else { |
2330 | ret = -EINVAL; | |
2331 | } | |
e8eef82b | 2332 | } |
75790251 MB |
2333 | } else { |
2334 | ret = -EINVAL; | |
2335 | } | |
e8eef82b | 2336 | |
eba41a5e | 2337 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2338 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2339 | && old_selector != selector) { | |
77af1b26 | 2340 | |
eba41a5e AL |
2341 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2342 | old_selector, selector); | |
2343 | if (delay < 0) { | |
2344 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2345 | delay); | |
2346 | delay = 0; | |
e8eef82b | 2347 | } |
75790251 | 2348 | |
8b96de31 PR |
2349 | /* Insert any necessary delays */ |
2350 | if (delay >= 1000) { | |
2351 | mdelay(delay / 1000); | |
2352 | udelay(delay % 1000); | |
2353 | } else if (delay) { | |
2354 | udelay(delay); | |
2355 | } | |
77af1b26 LW |
2356 | } |
2357 | ||
2f6c797f AL |
2358 | if (ret == 0 && best_val >= 0) { |
2359 | unsigned long data = best_val; | |
2360 | ||
ded06a52 | 2361 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2362 | (void *)data); |
2363 | } | |
ded06a52 | 2364 | |
eba41a5e | 2365 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2366 | |
2367 | return ret; | |
2368 | } | |
2369 | ||
414c70cb LG |
2370 | /** |
2371 | * regulator_set_voltage - set regulator output voltage | |
2372 | * @regulator: regulator source | |
2373 | * @min_uV: Minimum required voltage in uV | |
2374 | * @max_uV: Maximum acceptable voltage in uV | |
2375 | * | |
2376 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2377 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2378 | * | |
2379 | * If the regulator is enabled then the voltage will change to the new value | |
2380 | * immediately otherwise if the regulator is disabled the regulator will | |
2381 | * output at the new voltage when enabled. | |
2382 | * | |
2383 | * NOTE: If the regulator is shared between several devices then the lowest | |
2384 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2385 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2386 | * calling this function otherwise this call will fail. |
2387 | */ | |
2388 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2389 | { | |
2390 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2391 | int ret = 0; |
92d7a558 | 2392 | int old_min_uV, old_max_uV; |
414c70cb LG |
2393 | |
2394 | mutex_lock(&rdev->mutex); | |
2395 | ||
95a3c23a MB |
2396 | /* If we're setting the same range as last time the change |
2397 | * should be a noop (some cpufreq implementations use the same | |
2398 | * voltage for multiple frequencies, for example). | |
2399 | */ | |
2400 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2401 | goto out; | |
2402 | ||
414c70cb | 2403 | /* sanity check */ |
e8eef82b MB |
2404 | if (!rdev->desc->ops->set_voltage && |
2405 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2406 | ret = -EINVAL; |
2407 | goto out; | |
2408 | } | |
2409 | ||
2410 | /* constraints check */ | |
2411 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2412 | if (ret < 0) | |
2413 | goto out; | |
92d7a558 PP |
2414 | |
2415 | /* restore original values in case of error */ | |
2416 | old_min_uV = regulator->min_uV; | |
2417 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2418 | regulator->min_uV = min_uV; |
2419 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2420 | |
05fda3b1 TP |
2421 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2422 | if (ret < 0) | |
92d7a558 | 2423 | goto out2; |
05fda3b1 | 2424 | |
75790251 | 2425 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2426 | if (ret < 0) |
2427 | goto out2; | |
2428 | ||
414c70cb LG |
2429 | out: |
2430 | mutex_unlock(&rdev->mutex); | |
2431 | return ret; | |
92d7a558 PP |
2432 | out2: |
2433 | regulator->min_uV = old_min_uV; | |
2434 | regulator->max_uV = old_max_uV; | |
2435 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2436 | return ret; |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2439 | ||
88cd222b LW |
2440 | /** |
2441 | * regulator_set_voltage_time - get raise/fall time | |
2442 | * @regulator: regulator source | |
2443 | * @old_uV: starting voltage in microvolts | |
2444 | * @new_uV: target voltage in microvolts | |
2445 | * | |
2446 | * Provided with the starting and ending voltage, this function attempts to | |
2447 | * calculate the time in microseconds required to rise or fall to this new | |
2448 | * voltage. | |
2449 | */ | |
2450 | int regulator_set_voltage_time(struct regulator *regulator, | |
2451 | int old_uV, int new_uV) | |
2452 | { | |
2453 | struct regulator_dev *rdev = regulator->rdev; | |
2454 | struct regulator_ops *ops = rdev->desc->ops; | |
2455 | int old_sel = -1; | |
2456 | int new_sel = -1; | |
2457 | int voltage; | |
2458 | int i; | |
2459 | ||
2460 | /* Currently requires operations to do this */ | |
2461 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2462 | || !rdev->desc->n_voltages) | |
2463 | return -EINVAL; | |
2464 | ||
2465 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2466 | /* We only look for exact voltage matches here */ | |
2467 | voltage = regulator_list_voltage(regulator, i); | |
2468 | if (voltage < 0) | |
2469 | return -EINVAL; | |
2470 | if (voltage == 0) | |
2471 | continue; | |
2472 | if (voltage == old_uV) | |
2473 | old_sel = i; | |
2474 | if (voltage == new_uV) | |
2475 | new_sel = i; | |
2476 | } | |
2477 | ||
2478 | if (old_sel < 0 || new_sel < 0) | |
2479 | return -EINVAL; | |
2480 | ||
2481 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2482 | } | |
2483 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2484 | ||
98a175b6 | 2485 | /** |
296c6566 RD |
2486 | * regulator_set_voltage_time_sel - get raise/fall time |
2487 | * @rdev: regulator source device | |
98a175b6 YSB |
2488 | * @old_selector: selector for starting voltage |
2489 | * @new_selector: selector for target voltage | |
2490 | * | |
2491 | * Provided with the starting and target voltage selectors, this function | |
2492 | * returns time in microseconds required to rise or fall to this new voltage | |
2493 | * | |
f11d08c3 | 2494 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2495 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2496 | */ |
2497 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2498 | unsigned int old_selector, | |
2499 | unsigned int new_selector) | |
2500 | { | |
398715ab | 2501 | unsigned int ramp_delay = 0; |
f11d08c3 | 2502 | int old_volt, new_volt; |
398715ab AL |
2503 | |
2504 | if (rdev->constraints->ramp_delay) | |
2505 | ramp_delay = rdev->constraints->ramp_delay; | |
2506 | else if (rdev->desc->ramp_delay) | |
2507 | ramp_delay = rdev->desc->ramp_delay; | |
2508 | ||
2509 | if (ramp_delay == 0) { | |
6f0b2c69 | 2510 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2511 | return 0; |
6f0b2c69 | 2512 | } |
398715ab | 2513 | |
f11d08c3 AL |
2514 | /* sanity check */ |
2515 | if (!rdev->desc->ops->list_voltage) | |
2516 | return -EINVAL; | |
398715ab | 2517 | |
f11d08c3 AL |
2518 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2519 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2520 | ||
2521 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2522 | } |
b19dbf71 | 2523 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2524 | |
606a2562 MB |
2525 | /** |
2526 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2527 | * @regulator: regulator source | |
2528 | * | |
2529 | * Re-apply the last configured voltage. This is intended to be used | |
2530 | * where some external control source the consumer is cooperating with | |
2531 | * has caused the configured voltage to change. | |
2532 | */ | |
2533 | int regulator_sync_voltage(struct regulator *regulator) | |
2534 | { | |
2535 | struct regulator_dev *rdev = regulator->rdev; | |
2536 | int ret, min_uV, max_uV; | |
2537 | ||
2538 | mutex_lock(&rdev->mutex); | |
2539 | ||
2540 | if (!rdev->desc->ops->set_voltage && | |
2541 | !rdev->desc->ops->set_voltage_sel) { | |
2542 | ret = -EINVAL; | |
2543 | goto out; | |
2544 | } | |
2545 | ||
2546 | /* This is only going to work if we've had a voltage configured. */ | |
2547 | if (!regulator->min_uV && !regulator->max_uV) { | |
2548 | ret = -EINVAL; | |
2549 | goto out; | |
2550 | } | |
2551 | ||
2552 | min_uV = regulator->min_uV; | |
2553 | max_uV = regulator->max_uV; | |
2554 | ||
2555 | /* This should be a paranoia check... */ | |
2556 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2557 | if (ret < 0) | |
2558 | goto out; | |
2559 | ||
2560 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2561 | if (ret < 0) | |
2562 | goto out; | |
2563 | ||
2564 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2565 | ||
2566 | out: | |
2567 | mutex_unlock(&rdev->mutex); | |
2568 | return ret; | |
2569 | } | |
2570 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2571 | ||
414c70cb LG |
2572 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2573 | { | |
bf5892a8 | 2574 | int sel, ret; |
476c2d83 MB |
2575 | |
2576 | if (rdev->desc->ops->get_voltage_sel) { | |
2577 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2578 | if (sel < 0) | |
2579 | return sel; | |
bf5892a8 | 2580 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2581 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2582 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2583 | } else if (rdev->desc->ops->list_voltage) { |
2584 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
2585 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
2586 | ret = rdev->desc->fixed_uV; | |
cb220d16 | 2587 | } else { |
414c70cb | 2588 | return -EINVAL; |
cb220d16 | 2589 | } |
bf5892a8 | 2590 | |
cb220d16 AL |
2591 | if (ret < 0) |
2592 | return ret; | |
bf5892a8 | 2593 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2594 | } |
2595 | ||
2596 | /** | |
2597 | * regulator_get_voltage - get regulator output voltage | |
2598 | * @regulator: regulator source | |
2599 | * | |
2600 | * This returns the current regulator voltage in uV. | |
2601 | * | |
2602 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2603 | * function should not be used to determine regulator state. | |
2604 | */ | |
2605 | int regulator_get_voltage(struct regulator *regulator) | |
2606 | { | |
2607 | int ret; | |
2608 | ||
2609 | mutex_lock(®ulator->rdev->mutex); | |
2610 | ||
2611 | ret = _regulator_get_voltage(regulator->rdev); | |
2612 | ||
2613 | mutex_unlock(®ulator->rdev->mutex); | |
2614 | ||
2615 | return ret; | |
2616 | } | |
2617 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2618 | ||
2619 | /** | |
2620 | * regulator_set_current_limit - set regulator output current limit | |
2621 | * @regulator: regulator source | |
ce0d10f8 | 2622 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2623 | * @max_uA: Maximum supported current in uA |
2624 | * | |
2625 | * Sets current sink to the desired output current. This can be set during | |
2626 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2627 | * | |
2628 | * If the regulator is enabled then the current will change to the new value | |
2629 | * immediately otherwise if the regulator is disabled the regulator will | |
2630 | * output at the new current when enabled. | |
2631 | * | |
2632 | * NOTE: Regulator system constraints must be set for this regulator before | |
2633 | * calling this function otherwise this call will fail. | |
2634 | */ | |
2635 | int regulator_set_current_limit(struct regulator *regulator, | |
2636 | int min_uA, int max_uA) | |
2637 | { | |
2638 | struct regulator_dev *rdev = regulator->rdev; | |
2639 | int ret; | |
2640 | ||
2641 | mutex_lock(&rdev->mutex); | |
2642 | ||
2643 | /* sanity check */ | |
2644 | if (!rdev->desc->ops->set_current_limit) { | |
2645 | ret = -EINVAL; | |
2646 | goto out; | |
2647 | } | |
2648 | ||
2649 | /* constraints check */ | |
2650 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2651 | if (ret < 0) | |
2652 | goto out; | |
2653 | ||
2654 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2655 | out: | |
2656 | mutex_unlock(&rdev->mutex); | |
2657 | return ret; | |
2658 | } | |
2659 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2660 | ||
2661 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2662 | { | |
2663 | int ret; | |
2664 | ||
2665 | mutex_lock(&rdev->mutex); | |
2666 | ||
2667 | /* sanity check */ | |
2668 | if (!rdev->desc->ops->get_current_limit) { | |
2669 | ret = -EINVAL; | |
2670 | goto out; | |
2671 | } | |
2672 | ||
2673 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2674 | out: | |
2675 | mutex_unlock(&rdev->mutex); | |
2676 | return ret; | |
2677 | } | |
2678 | ||
2679 | /** | |
2680 | * regulator_get_current_limit - get regulator output current | |
2681 | * @regulator: regulator source | |
2682 | * | |
2683 | * This returns the current supplied by the specified current sink in uA. | |
2684 | * | |
2685 | * NOTE: If the regulator is disabled it will return the current value. This | |
2686 | * function should not be used to determine regulator state. | |
2687 | */ | |
2688 | int regulator_get_current_limit(struct regulator *regulator) | |
2689 | { | |
2690 | return _regulator_get_current_limit(regulator->rdev); | |
2691 | } | |
2692 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2693 | ||
2694 | /** | |
2695 | * regulator_set_mode - set regulator operating mode | |
2696 | * @regulator: regulator source | |
2697 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2698 | * | |
2699 | * Set regulator operating mode to increase regulator efficiency or improve | |
2700 | * regulation performance. | |
2701 | * | |
2702 | * NOTE: Regulator system constraints must be set for this regulator before | |
2703 | * calling this function otherwise this call will fail. | |
2704 | */ | |
2705 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2706 | { | |
2707 | struct regulator_dev *rdev = regulator->rdev; | |
2708 | int ret; | |
500b4ac9 | 2709 | int regulator_curr_mode; |
414c70cb LG |
2710 | |
2711 | mutex_lock(&rdev->mutex); | |
2712 | ||
2713 | /* sanity check */ | |
2714 | if (!rdev->desc->ops->set_mode) { | |
2715 | ret = -EINVAL; | |
2716 | goto out; | |
2717 | } | |
2718 | ||
500b4ac9 SI |
2719 | /* return if the same mode is requested */ |
2720 | if (rdev->desc->ops->get_mode) { | |
2721 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2722 | if (regulator_curr_mode == mode) { | |
2723 | ret = 0; | |
2724 | goto out; | |
2725 | } | |
2726 | } | |
2727 | ||
414c70cb | 2728 | /* constraints check */ |
22c51b47 | 2729 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2730 | if (ret < 0) |
2731 | goto out; | |
2732 | ||
2733 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2734 | out: | |
2735 | mutex_unlock(&rdev->mutex); | |
2736 | return ret; | |
2737 | } | |
2738 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2739 | ||
2740 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2741 | { | |
2742 | int ret; | |
2743 | ||
2744 | mutex_lock(&rdev->mutex); | |
2745 | ||
2746 | /* sanity check */ | |
2747 | if (!rdev->desc->ops->get_mode) { | |
2748 | ret = -EINVAL; | |
2749 | goto out; | |
2750 | } | |
2751 | ||
2752 | ret = rdev->desc->ops->get_mode(rdev); | |
2753 | out: | |
2754 | mutex_unlock(&rdev->mutex); | |
2755 | return ret; | |
2756 | } | |
2757 | ||
2758 | /** | |
2759 | * regulator_get_mode - get regulator operating mode | |
2760 | * @regulator: regulator source | |
2761 | * | |
2762 | * Get the current regulator operating mode. | |
2763 | */ | |
2764 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2765 | { | |
2766 | return _regulator_get_mode(regulator->rdev); | |
2767 | } | |
2768 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2769 | ||
2770 | /** | |
2771 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2772 | * @regulator: regulator source | |
2773 | * @uA_load: load current | |
2774 | * | |
2775 | * Notifies the regulator core of a new device load. This is then used by | |
2776 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2777 | * operating mode for the new regulator loading. | |
2778 | * | |
2779 | * Consumer devices notify their supply regulator of the maximum power | |
2780 | * they will require (can be taken from device datasheet in the power | |
2781 | * consumption tables) when they change operational status and hence power | |
2782 | * state. Examples of operational state changes that can affect power | |
2783 | * consumption are :- | |
2784 | * | |
2785 | * o Device is opened / closed. | |
2786 | * o Device I/O is about to begin or has just finished. | |
2787 | * o Device is idling in between work. | |
2788 | * | |
2789 | * This information is also exported via sysfs to userspace. | |
2790 | * | |
2791 | * DRMS will sum the total requested load on the regulator and change | |
2792 | * to the most efficient operating mode if platform constraints allow. | |
2793 | * | |
2794 | * Returns the new regulator mode or error. | |
2795 | */ | |
2796 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2797 | { | |
2798 | struct regulator_dev *rdev = regulator->rdev; | |
2799 | struct regulator *consumer; | |
d92d95b6 | 2800 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
414c70cb LG |
2801 | unsigned int mode; |
2802 | ||
d92d95b6 SB |
2803 | if (rdev->supply) |
2804 | input_uV = regulator_get_voltage(rdev->supply); | |
2805 | ||
414c70cb LG |
2806 | mutex_lock(&rdev->mutex); |
2807 | ||
a4b41483 MB |
2808 | /* |
2809 | * first check to see if we can set modes at all, otherwise just | |
2810 | * tell the consumer everything is OK. | |
2811 | */ | |
414c70cb LG |
2812 | regulator->uA_load = uA_load; |
2813 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2814 | if (ret < 0) { |
2815 | ret = 0; | |
414c70cb | 2816 | goto out; |
a4b41483 | 2817 | } |
414c70cb | 2818 | |
414c70cb LG |
2819 | if (!rdev->desc->ops->get_optimum_mode) |
2820 | goto out; | |
2821 | ||
a4b41483 MB |
2822 | /* |
2823 | * we can actually do this so any errors are indicators of | |
2824 | * potential real failure. | |
2825 | */ | |
2826 | ret = -EINVAL; | |
2827 | ||
854ccbae AL |
2828 | if (!rdev->desc->ops->set_mode) |
2829 | goto out; | |
2830 | ||
414c70cb | 2831 | /* get output voltage */ |
1bf5a1f8 | 2832 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2833 | if (output_uV <= 0) { |
5da84fd9 | 2834 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2835 | goto out; |
2836 | } | |
2837 | ||
d92d95b6 | 2838 | /* No supply? Use constraint voltage */ |
1bf5a1f8 | 2839 | if (input_uV <= 0) |
414c70cb LG |
2840 | input_uV = rdev->constraints->input_uV; |
2841 | if (input_uV <= 0) { | |
5da84fd9 | 2842 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2843 | goto out; |
2844 | } | |
2845 | ||
2846 | /* calc total requested load for this regulator */ | |
2847 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2848 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2849 | |
2850 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2851 | input_uV, output_uV, | |
2852 | total_uA_load); | |
2c608234 | 2853 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2854 | if (ret < 0) { |
5da84fd9 JP |
2855 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2856 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2857 | goto out; |
2858 | } | |
2859 | ||
2860 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2861 | if (ret < 0) { |
5da84fd9 | 2862 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2863 | goto out; |
2864 | } | |
2865 | ret = mode; | |
2866 | out: | |
2867 | mutex_unlock(&rdev->mutex); | |
2868 | return ret; | |
2869 | } | |
2870 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2871 | ||
f59c8f9f MB |
2872 | /** |
2873 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
2874 | * | |
2875 | * @regulator: Regulator to configure | |
9345dfb8 | 2876 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
2877 | * |
2878 | * Allow the regulator to go into bypass mode if all other consumers | |
2879 | * for the regulator also enable bypass mode and the machine | |
2880 | * constraints allow this. Bypass mode means that the regulator is | |
2881 | * simply passing the input directly to the output with no regulation. | |
2882 | */ | |
2883 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
2884 | { | |
2885 | struct regulator_dev *rdev = regulator->rdev; | |
2886 | int ret = 0; | |
2887 | ||
2888 | if (!rdev->desc->ops->set_bypass) | |
2889 | return 0; | |
2890 | ||
2891 | if (rdev->constraints && | |
2892 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
2893 | return 0; | |
2894 | ||
2895 | mutex_lock(&rdev->mutex); | |
2896 | ||
2897 | if (enable && !regulator->bypass) { | |
2898 | rdev->bypass_count++; | |
2899 | ||
2900 | if (rdev->bypass_count == rdev->open_count) { | |
2901 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2902 | if (ret != 0) | |
2903 | rdev->bypass_count--; | |
2904 | } | |
2905 | ||
2906 | } else if (!enable && regulator->bypass) { | |
2907 | rdev->bypass_count--; | |
2908 | ||
2909 | if (rdev->bypass_count != rdev->open_count) { | |
2910 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2911 | if (ret != 0) | |
2912 | rdev->bypass_count++; | |
2913 | } | |
2914 | } | |
2915 | ||
2916 | if (ret == 0) | |
2917 | regulator->bypass = enable; | |
2918 | ||
2919 | mutex_unlock(&rdev->mutex); | |
2920 | ||
2921 | return ret; | |
2922 | } | |
2923 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
2924 | ||
414c70cb LG |
2925 | /** |
2926 | * regulator_register_notifier - register regulator event notifier | |
2927 | * @regulator: regulator source | |
69279fb9 | 2928 | * @nb: notifier block |
414c70cb LG |
2929 | * |
2930 | * Register notifier block to receive regulator events. | |
2931 | */ | |
2932 | int regulator_register_notifier(struct regulator *regulator, | |
2933 | struct notifier_block *nb) | |
2934 | { | |
2935 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2936 | nb); | |
2937 | } | |
2938 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2939 | ||
2940 | /** | |
2941 | * regulator_unregister_notifier - unregister regulator event notifier | |
2942 | * @regulator: regulator source | |
69279fb9 | 2943 | * @nb: notifier block |
414c70cb LG |
2944 | * |
2945 | * Unregister regulator event notifier block. | |
2946 | */ | |
2947 | int regulator_unregister_notifier(struct regulator *regulator, | |
2948 | struct notifier_block *nb) | |
2949 | { | |
2950 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2951 | nb); | |
2952 | } | |
2953 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2954 | ||
b136fb44 JC |
2955 | /* notify regulator consumers and downstream regulator consumers. |
2956 | * Note mutex must be held by caller. | |
2957 | */ | |
414c70cb LG |
2958 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2959 | unsigned long event, void *data) | |
2960 | { | |
414c70cb | 2961 | /* call rdev chain first */ |
d8493d21 | 2962 | blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
2963 | } |
2964 | ||
2965 | /** | |
2966 | * regulator_bulk_get - get multiple regulator consumers | |
2967 | * | |
2968 | * @dev: Device to supply | |
2969 | * @num_consumers: Number of consumers to register | |
2970 | * @consumers: Configuration of consumers; clients are stored here. | |
2971 | * | |
2972 | * @return 0 on success, an errno on failure. | |
2973 | * | |
2974 | * This helper function allows drivers to get several regulator | |
2975 | * consumers in one operation. If any of the regulators cannot be | |
2976 | * acquired then any regulators that were allocated will be freed | |
2977 | * before returning to the caller. | |
2978 | */ | |
2979 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2980 | struct regulator_bulk_data *consumers) | |
2981 | { | |
2982 | int i; | |
2983 | int ret; | |
2984 | ||
2985 | for (i = 0; i < num_consumers; i++) | |
2986 | consumers[i].consumer = NULL; | |
2987 | ||
2988 | for (i = 0; i < num_consumers; i++) { | |
2989 | consumers[i].consumer = regulator_get(dev, | |
2990 | consumers[i].supply); | |
2991 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2992 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2993 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2994 | consumers[i].supply, ret); | |
414c70cb LG |
2995 | consumers[i].consumer = NULL; |
2996 | goto err; | |
2997 | } | |
2998 | } | |
2999 | ||
3000 | return 0; | |
3001 | ||
3002 | err: | |
b29c7690 | 3003 | while (--i >= 0) |
414c70cb LG |
3004 | regulator_put(consumers[i].consumer); |
3005 | ||
3006 | return ret; | |
3007 | } | |
3008 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3009 | ||
f21e0e81 MB |
3010 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3011 | { | |
3012 | struct regulator_bulk_data *bulk = data; | |
3013 | ||
3014 | bulk->ret = regulator_enable(bulk->consumer); | |
3015 | } | |
3016 | ||
414c70cb LG |
3017 | /** |
3018 | * regulator_bulk_enable - enable multiple regulator consumers | |
3019 | * | |
3020 | * @num_consumers: Number of consumers | |
3021 | * @consumers: Consumer data; clients are stored here. | |
3022 | * @return 0 on success, an errno on failure | |
3023 | * | |
3024 | * This convenience API allows consumers to enable multiple regulator | |
3025 | * clients in a single API call. If any consumers cannot be enabled | |
3026 | * then any others that were enabled will be disabled again prior to | |
3027 | * return. | |
3028 | */ | |
3029 | int regulator_bulk_enable(int num_consumers, | |
3030 | struct regulator_bulk_data *consumers) | |
3031 | { | |
2955b47d | 3032 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3033 | int i; |
f21e0e81 | 3034 | int ret = 0; |
414c70cb | 3035 | |
6492bc1b MB |
3036 | for (i = 0; i < num_consumers; i++) { |
3037 | if (consumers[i].consumer->always_on) | |
3038 | consumers[i].ret = 0; | |
3039 | else | |
3040 | async_schedule_domain(regulator_bulk_enable_async, | |
3041 | &consumers[i], &async_domain); | |
3042 | } | |
f21e0e81 MB |
3043 | |
3044 | async_synchronize_full_domain(&async_domain); | |
3045 | ||
3046 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3047 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3048 | if (consumers[i].ret != 0) { |
3049 | ret = consumers[i].ret; | |
414c70cb | 3050 | goto err; |
f21e0e81 | 3051 | } |
414c70cb LG |
3052 | } |
3053 | ||
3054 | return 0; | |
3055 | ||
3056 | err: | |
fbe31057 AH |
3057 | for (i = 0; i < num_consumers; i++) { |
3058 | if (consumers[i].ret < 0) | |
3059 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3060 | consumers[i].ret); | |
3061 | else | |
3062 | regulator_disable(consumers[i].consumer); | |
3063 | } | |
414c70cb LG |
3064 | |
3065 | return ret; | |
3066 | } | |
3067 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3068 | ||
3069 | /** | |
3070 | * regulator_bulk_disable - disable multiple regulator consumers | |
3071 | * | |
3072 | * @num_consumers: Number of consumers | |
3073 | * @consumers: Consumer data; clients are stored here. | |
3074 | * @return 0 on success, an errno on failure | |
3075 | * | |
3076 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3077 | * clients in a single API call. If any consumers cannot be disabled |
3078 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3079 | * return. |
3080 | */ | |
3081 | int regulator_bulk_disable(int num_consumers, | |
3082 | struct regulator_bulk_data *consumers) | |
3083 | { | |
3084 | int i; | |
01e86f49 | 3085 | int ret, r; |
414c70cb | 3086 | |
49e22632 | 3087 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3088 | ret = regulator_disable(consumers[i].consumer); |
3089 | if (ret != 0) | |
3090 | goto err; | |
3091 | } | |
3092 | ||
3093 | return 0; | |
3094 | ||
3095 | err: | |
5da84fd9 | 3096 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3097 | for (++i; i < num_consumers; ++i) { |
3098 | r = regulator_enable(consumers[i].consumer); | |
3099 | if (r != 0) | |
3100 | pr_err("Failed to reename %s: %d\n", | |
3101 | consumers[i].supply, r); | |
3102 | } | |
414c70cb LG |
3103 | |
3104 | return ret; | |
3105 | } | |
3106 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3107 | ||
e1de2f42 DK |
3108 | /** |
3109 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3110 | * | |
3111 | * @num_consumers: Number of consumers | |
3112 | * @consumers: Consumer data; clients are stored here. | |
3113 | * @return 0 on success, an errno on failure | |
3114 | * | |
3115 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3116 | * clients in a single API call. | |
3117 | * NOTE: This should be used for situations when device damage will | |
3118 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3119 | * Although regulator_force_disable function call for some consumers can | |
3120 | * return error numbers, the function is called for all consumers. | |
3121 | */ | |
3122 | int regulator_bulk_force_disable(int num_consumers, | |
3123 | struct regulator_bulk_data *consumers) | |
3124 | { | |
3125 | int i; | |
3126 | int ret; | |
3127 | ||
3128 | for (i = 0; i < num_consumers; i++) | |
3129 | consumers[i].ret = | |
3130 | regulator_force_disable(consumers[i].consumer); | |
3131 | ||
3132 | for (i = 0; i < num_consumers; i++) { | |
3133 | if (consumers[i].ret != 0) { | |
3134 | ret = consumers[i].ret; | |
3135 | goto out; | |
3136 | } | |
3137 | } | |
3138 | ||
3139 | return 0; | |
3140 | out: | |
3141 | return ret; | |
3142 | } | |
3143 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3144 | ||
414c70cb LG |
3145 | /** |
3146 | * regulator_bulk_free - free multiple regulator consumers | |
3147 | * | |
3148 | * @num_consumers: Number of consumers | |
3149 | * @consumers: Consumer data; clients are stored here. | |
3150 | * | |
3151 | * This convenience API allows consumers to free multiple regulator | |
3152 | * clients in a single API call. | |
3153 | */ | |
3154 | void regulator_bulk_free(int num_consumers, | |
3155 | struct regulator_bulk_data *consumers) | |
3156 | { | |
3157 | int i; | |
3158 | ||
3159 | for (i = 0; i < num_consumers; i++) { | |
3160 | regulator_put(consumers[i].consumer); | |
3161 | consumers[i].consumer = NULL; | |
3162 | } | |
3163 | } | |
3164 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3165 | ||
3166 | /** | |
3167 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3168 | * @rdev: regulator source |
414c70cb | 3169 | * @event: notifier block |
69279fb9 | 3170 | * @data: callback-specific data. |
414c70cb LG |
3171 | * |
3172 | * Called by regulator drivers to notify clients a regulator event has | |
3173 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3174 | * Note lock must be held by caller. |
414c70cb LG |
3175 | */ |
3176 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3177 | unsigned long event, void *data) | |
3178 | { | |
3179 | _notifier_call_chain(rdev, event, data); | |
3180 | return NOTIFY_DONE; | |
3181 | ||
3182 | } | |
3183 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3184 | ||
be721979 MB |
3185 | /** |
3186 | * regulator_mode_to_status - convert a regulator mode into a status | |
3187 | * | |
3188 | * @mode: Mode to convert | |
3189 | * | |
3190 | * Convert a regulator mode into a status. | |
3191 | */ | |
3192 | int regulator_mode_to_status(unsigned int mode) | |
3193 | { | |
3194 | switch (mode) { | |
3195 | case REGULATOR_MODE_FAST: | |
3196 | return REGULATOR_STATUS_FAST; | |
3197 | case REGULATOR_MODE_NORMAL: | |
3198 | return REGULATOR_STATUS_NORMAL; | |
3199 | case REGULATOR_MODE_IDLE: | |
3200 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3201 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3202 | return REGULATOR_STATUS_STANDBY; |
3203 | default: | |
1beaf762 | 3204 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3205 | } |
3206 | } | |
3207 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3208 | ||
7ad68e2f DB |
3209 | /* |
3210 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3211 | * create attributes that can be meaningfully displayed. | |
3212 | */ | |
3213 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3214 | { | |
3215 | struct device *dev = &rdev->dev; | |
3216 | struct regulator_ops *ops = rdev->desc->ops; | |
3217 | int status = 0; | |
3218 | ||
3219 | /* some attributes need specific methods to be displayed */ | |
4c78899b | 3220 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
f2889e65 | 3221 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
5a523605 LD |
3222 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || |
3223 | (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { | |
7ad68e2f DB |
3224 | status = device_create_file(dev, &dev_attr_microvolts); |
3225 | if (status < 0) | |
3226 | return status; | |
3227 | } | |
3228 | if (ops->get_current_limit) { | |
3229 | status = device_create_file(dev, &dev_attr_microamps); | |
3230 | if (status < 0) | |
3231 | return status; | |
3232 | } | |
3233 | if (ops->get_mode) { | |
3234 | status = device_create_file(dev, &dev_attr_opmode); | |
3235 | if (status < 0) | |
3236 | return status; | |
3237 | } | |
7b74d149 | 3238 | if (rdev->ena_pin || ops->is_enabled) { |
7ad68e2f DB |
3239 | status = device_create_file(dev, &dev_attr_state); |
3240 | if (status < 0) | |
3241 | return status; | |
3242 | } | |
853116a1 DB |
3243 | if (ops->get_status) { |
3244 | status = device_create_file(dev, &dev_attr_status); | |
3245 | if (status < 0) | |
3246 | return status; | |
3247 | } | |
f59c8f9f MB |
3248 | if (ops->get_bypass) { |
3249 | status = device_create_file(dev, &dev_attr_bypass); | |
3250 | if (status < 0) | |
3251 | return status; | |
3252 | } | |
7ad68e2f DB |
3253 | |
3254 | /* some attributes are type-specific */ | |
3255 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3256 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3257 | if (status < 0) | |
3258 | return status; | |
3259 | } | |
3260 | ||
3261 | /* all the other attributes exist to support constraints; | |
3262 | * don't show them if there are no constraints, or if the | |
3263 | * relevant supporting methods are missing. | |
3264 | */ | |
3265 | if (!rdev->constraints) | |
3266 | return status; | |
3267 | ||
3268 | /* constraints need specific supporting methods */ | |
e8eef82b | 3269 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3270 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3271 | if (status < 0) | |
3272 | return status; | |
3273 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3274 | if (status < 0) | |
3275 | return status; | |
3276 | } | |
3277 | if (ops->set_current_limit) { | |
3278 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3279 | if (status < 0) | |
3280 | return status; | |
3281 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3282 | if (status < 0) | |
3283 | return status; | |
3284 | } | |
3285 | ||
7ad68e2f DB |
3286 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3287 | if (status < 0) | |
3288 | return status; | |
3289 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3290 | if (status < 0) | |
3291 | return status; | |
3292 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3293 | if (status < 0) | |
3294 | return status; | |
3295 | ||
3296 | if (ops->set_suspend_voltage) { | |
3297 | status = device_create_file(dev, | |
3298 | &dev_attr_suspend_standby_microvolts); | |
3299 | if (status < 0) | |
3300 | return status; | |
3301 | status = device_create_file(dev, | |
3302 | &dev_attr_suspend_mem_microvolts); | |
3303 | if (status < 0) | |
3304 | return status; | |
3305 | status = device_create_file(dev, | |
3306 | &dev_attr_suspend_disk_microvolts); | |
3307 | if (status < 0) | |
3308 | return status; | |
3309 | } | |
3310 | ||
3311 | if (ops->set_suspend_mode) { | |
3312 | status = device_create_file(dev, | |
3313 | &dev_attr_suspend_standby_mode); | |
3314 | if (status < 0) | |
3315 | return status; | |
3316 | status = device_create_file(dev, | |
3317 | &dev_attr_suspend_mem_mode); | |
3318 | if (status < 0) | |
3319 | return status; | |
3320 | status = device_create_file(dev, | |
3321 | &dev_attr_suspend_disk_mode); | |
3322 | if (status < 0) | |
3323 | return status; | |
3324 | } | |
3325 | ||
3326 | return status; | |
3327 | } | |
3328 | ||
1130e5b3 MB |
3329 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3330 | { | |
1130e5b3 | 3331 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3332 | if (!rdev->debugfs) { |
1130e5b3 | 3333 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3334 | return; |
3335 | } | |
3336 | ||
3337 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3338 | &rdev->use_count); | |
3339 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3340 | &rdev->open_count); | |
f59c8f9f MB |
3341 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3342 | &rdev->bypass_count); | |
1130e5b3 MB |
3343 | } |
3344 | ||
414c70cb LG |
3345 | /** |
3346 | * regulator_register - register regulator | |
69279fb9 | 3347 | * @regulator_desc: regulator to register |
c172708d | 3348 | * @config: runtime configuration for regulator |
414c70cb LG |
3349 | * |
3350 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3351 | * Returns a valid pointer to struct regulator_dev on success |
3352 | * or an ERR_PTR() on error. | |
414c70cb | 3353 | */ |
65f26846 MB |
3354 | struct regulator_dev * |
3355 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3356 | const struct regulator_config *config) |
414c70cb | 3357 | { |
9a8f5e07 | 3358 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3359 | const struct regulator_init_data *init_data; |
414c70cb LG |
3360 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3361 | struct regulator_dev *rdev; | |
32c8fad4 | 3362 | struct device *dev; |
a5766f11 | 3363 | int ret, i; |
69511a45 | 3364 | const char *supply = NULL; |
414c70cb | 3365 | |
c172708d | 3366 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3367 | return ERR_PTR(-EINVAL); |
3368 | ||
32c8fad4 | 3369 | dev = config->dev; |
dcf70112 | 3370 | WARN_ON(!dev); |
32c8fad4 | 3371 | |
414c70cb LG |
3372 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3373 | return ERR_PTR(-EINVAL); | |
3374 | ||
cd78dfc6 DL |
3375 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3376 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3377 | return ERR_PTR(-EINVAL); |
3378 | ||
476c2d83 MB |
3379 | /* Only one of each should be implemented */ |
3380 | WARN_ON(regulator_desc->ops->get_voltage && | |
3381 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3382 | WARN_ON(regulator_desc->ops->set_voltage && |
3383 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3384 | |
3385 | /* If we're using selectors we must implement list_voltage. */ | |
3386 | if (regulator_desc->ops->get_voltage_sel && | |
3387 | !regulator_desc->ops->list_voltage) { | |
3388 | return ERR_PTR(-EINVAL); | |
3389 | } | |
e8eef82b MB |
3390 | if (regulator_desc->ops->set_voltage_sel && |
3391 | !regulator_desc->ops->list_voltage) { | |
3392 | return ERR_PTR(-EINVAL); | |
3393 | } | |
476c2d83 | 3394 | |
c172708d MB |
3395 | init_data = config->init_data; |
3396 | ||
414c70cb LG |
3397 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3398 | if (rdev == NULL) | |
3399 | return ERR_PTR(-ENOMEM); | |
3400 | ||
3401 | mutex_lock(®ulator_list_mutex); | |
3402 | ||
3403 | mutex_init(&rdev->mutex); | |
c172708d | 3404 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3405 | rdev->owner = regulator_desc->owner; |
3406 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3407 | if (config->regmap) |
3408 | rdev->regmap = config->regmap; | |
52b84dac | 3409 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3410 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3411 | else if (dev->parent) |
3412 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3413 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3414 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3415 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3416 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3417 | |
a5766f11 | 3418 | /* preform any regulator specific init */ |
9a8f5e07 | 3419 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3420 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3421 | if (ret < 0) |
3422 | goto clean; | |
a5766f11 LG |
3423 | } |
3424 | ||
a5766f11 | 3425 | /* register with sysfs */ |
414c70cb | 3426 | rdev->dev.class = ®ulator_class; |
c172708d | 3427 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3428 | rdev->dev.parent = dev; |
812460a9 KS |
3429 | dev_set_name(&rdev->dev, "regulator.%d", |
3430 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3431 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3432 | if (ret != 0) { |
3433 | put_device(&rdev->dev); | |
4fca9545 | 3434 | goto clean; |
ad7725cb | 3435 | } |
a5766f11 LG |
3436 | |
3437 | dev_set_drvdata(&rdev->dev, rdev); | |
3438 | ||
b2a1ef47 | 3439 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
f19b00da | 3440 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3441 | if (ret != 0) { |
3442 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3443 | config->ena_gpio, ret); | |
b2da55d9 | 3444 | goto wash; |
65f73508 MB |
3445 | } |
3446 | ||
65f73508 MB |
3447 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) |
3448 | rdev->ena_gpio_state = 1; | |
3449 | ||
7b74d149 | 3450 | if (config->ena_gpio_invert) |
65f73508 MB |
3451 | rdev->ena_gpio_state = !rdev->ena_gpio_state; |
3452 | } | |
3453 | ||
74f544c1 | 3454 | /* set regulator constraints */ |
9a8f5e07 MB |
3455 | if (init_data) |
3456 | constraints = &init_data->constraints; | |
3457 | ||
3458 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3459 | if (ret < 0) |
3460 | goto scrub; | |
3461 | ||
7ad68e2f DB |
3462 | /* add attributes supported by this regulator */ |
3463 | ret = add_regulator_attributes(rdev); | |
3464 | if (ret < 0) | |
3465 | goto scrub; | |
3466 | ||
9a8f5e07 | 3467 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3468 | supply = init_data->supply_regulator; |
3469 | else if (regulator_desc->supply_name) | |
3470 | supply = regulator_desc->supply_name; | |
3471 | ||
3472 | if (supply) { | |
0178f3e2 | 3473 | struct regulator_dev *r; |
0178f3e2 | 3474 | |
6d191a5f | 3475 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3476 | |
0f7b87f0 AB |
3477 | if (ret == -ENODEV) { |
3478 | /* | |
3479 | * No supply was specified for this regulator and | |
3480 | * there will never be one. | |
3481 | */ | |
3482 | ret = 0; | |
3483 | goto add_dev; | |
3484 | } else if (!r) { | |
69511a45 | 3485 | dev_err(dev, "Failed to find supply %s\n", supply); |
04bf3011 | 3486 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3487 | goto scrub; |
3488 | } | |
3489 | ||
3490 | ret = set_supply(rdev, r); | |
3491 | if (ret < 0) | |
3492 | goto scrub; | |
b2296bd4 LD |
3493 | |
3494 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3495 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3496 | ret = regulator_enable(rdev->supply); |
3497 | if (ret < 0) | |
3498 | goto scrub; | |
3499 | } | |
0178f3e2 MB |
3500 | } |
3501 | ||
0f7b87f0 | 3502 | add_dev: |
a5766f11 | 3503 | /* add consumers devices */ |
9a8f5e07 MB |
3504 | if (init_data) { |
3505 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3506 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3507 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3508 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3509 | if (ret < 0) { |
3510 | dev_err(dev, "Failed to set supply %s\n", | |
3511 | init_data->consumer_supplies[i].supply); | |
3512 | goto unset_supplies; | |
3513 | } | |
23c2f041 | 3514 | } |
414c70cb | 3515 | } |
a5766f11 LG |
3516 | |
3517 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3518 | |
3519 | rdev_init_debugfs(rdev); | |
a5766f11 | 3520 | out: |
414c70cb LG |
3521 | mutex_unlock(®ulator_list_mutex); |
3522 | return rdev; | |
4fca9545 | 3523 | |
d4033b54 JN |
3524 | unset_supplies: |
3525 | unset_regulator_supplies(rdev); | |
3526 | ||
4fca9545 | 3527 | scrub: |
e81dba85 | 3528 | if (rdev->supply) |
23ff2f0f | 3529 | _regulator_put(rdev->supply); |
f19b00da | 3530 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3531 | kfree(rdev->constraints); |
b2da55d9 | 3532 | wash: |
4fca9545 | 3533 | device_unregister(&rdev->dev); |
53032daf PW |
3534 | /* device core frees rdev */ |
3535 | rdev = ERR_PTR(ret); | |
3536 | goto out; | |
3537 | ||
4fca9545 DB |
3538 | clean: |
3539 | kfree(rdev); | |
3540 | rdev = ERR_PTR(ret); | |
3541 | goto out; | |
414c70cb LG |
3542 | } |
3543 | EXPORT_SYMBOL_GPL(regulator_register); | |
3544 | ||
3545 | /** | |
3546 | * regulator_unregister - unregister regulator | |
69279fb9 | 3547 | * @rdev: regulator to unregister |
414c70cb LG |
3548 | * |
3549 | * Called by regulator drivers to unregister a regulator. | |
3550 | */ | |
3551 | void regulator_unregister(struct regulator_dev *rdev) | |
3552 | { | |
3553 | if (rdev == NULL) | |
3554 | return; | |
3555 | ||
891636ea MB |
3556 | if (rdev->supply) { |
3557 | while (rdev->use_count--) | |
3558 | regulator_disable(rdev->supply); | |
e032b376 | 3559 | regulator_put(rdev->supply); |
891636ea | 3560 | } |
414c70cb | 3561 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3562 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3563 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3564 | WARN_ON(rdev->open_count); |
0f1d747b | 3565 | unset_regulator_supplies(rdev); |
414c70cb | 3566 | list_del(&rdev->list); |
f8c12fe3 | 3567 | kfree(rdev->constraints); |
f19b00da | 3568 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 3569 | device_unregister(&rdev->dev); |
414c70cb LG |
3570 | mutex_unlock(®ulator_list_mutex); |
3571 | } | |
3572 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3573 | ||
414c70cb | 3574 | /** |
cf7bbcdf | 3575 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3576 | * @state: system suspend state |
3577 | * | |
3578 | * Configure each regulator with it's suspend operating parameters for state. | |
3579 | * This will usually be called by machine suspend code prior to supending. | |
3580 | */ | |
3581 | int regulator_suspend_prepare(suspend_state_t state) | |
3582 | { | |
3583 | struct regulator_dev *rdev; | |
3584 | int ret = 0; | |
3585 | ||
3586 | /* ON is handled by regulator active state */ | |
3587 | if (state == PM_SUSPEND_ON) | |
3588 | return -EINVAL; | |
3589 | ||
3590 | mutex_lock(®ulator_list_mutex); | |
3591 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3592 | ||
3593 | mutex_lock(&rdev->mutex); | |
3594 | ret = suspend_prepare(rdev, state); | |
3595 | mutex_unlock(&rdev->mutex); | |
3596 | ||
3597 | if (ret < 0) { | |
5da84fd9 | 3598 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3599 | goto out; |
3600 | } | |
3601 | } | |
3602 | out: | |
3603 | mutex_unlock(®ulator_list_mutex); | |
3604 | return ret; | |
3605 | } | |
3606 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3607 | ||
7a32b589 MH |
3608 | /** |
3609 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3610 | * | |
3611 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3612 | * and that should be turned on according to the regulators properties. | |
3613 | */ | |
3614 | int regulator_suspend_finish(void) | |
3615 | { | |
3616 | struct regulator_dev *rdev; | |
3617 | int ret = 0, error; | |
3618 | ||
3619 | mutex_lock(®ulator_list_mutex); | |
3620 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3621 | struct regulator_ops *ops = rdev->desc->ops; | |
3622 | ||
3623 | mutex_lock(&rdev->mutex); | |
3624 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3625 | ops->enable) { | |
3626 | error = ops->enable(rdev); | |
3627 | if (error) | |
3628 | ret = error; | |
3629 | } else { | |
3630 | if (!has_full_constraints) | |
3631 | goto unlock; | |
3632 | if (!ops->disable) | |
3633 | goto unlock; | |
b1a86831 | 3634 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3635 | goto unlock; |
3636 | ||
3637 | error = ops->disable(rdev); | |
3638 | if (error) | |
3639 | ret = error; | |
3640 | } | |
3641 | unlock: | |
3642 | mutex_unlock(&rdev->mutex); | |
3643 | } | |
3644 | mutex_unlock(®ulator_list_mutex); | |
3645 | return ret; | |
3646 | } | |
3647 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3648 | ||
ca725561 MB |
3649 | /** |
3650 | * regulator_has_full_constraints - the system has fully specified constraints | |
3651 | * | |
3652 | * Calling this function will cause the regulator API to disable all | |
3653 | * regulators which have a zero use count and don't have an always_on | |
3654 | * constraint in a late_initcall. | |
3655 | * | |
3656 | * The intention is that this will become the default behaviour in a | |
3657 | * future kernel release so users are encouraged to use this facility | |
3658 | * now. | |
3659 | */ | |
3660 | void regulator_has_full_constraints(void) | |
3661 | { | |
3662 | has_full_constraints = 1; | |
3663 | } | |
3664 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3665 | ||
414c70cb LG |
3666 | /** |
3667 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3668 | * @rdev: regulator |
414c70cb LG |
3669 | * |
3670 | * Get rdev regulator driver private data. This call can be used in the | |
3671 | * regulator driver context. | |
3672 | */ | |
3673 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3674 | { | |
3675 | return rdev->reg_data; | |
3676 | } | |
3677 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3678 | ||
3679 | /** | |
3680 | * regulator_get_drvdata - get regulator driver data | |
3681 | * @regulator: regulator | |
3682 | * | |
3683 | * Get regulator driver private data. This call can be used in the consumer | |
3684 | * driver context when non API regulator specific functions need to be called. | |
3685 | */ | |
3686 | void *regulator_get_drvdata(struct regulator *regulator) | |
3687 | { | |
3688 | return regulator->rdev->reg_data; | |
3689 | } | |
3690 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3691 | ||
3692 | /** | |
3693 | * regulator_set_drvdata - set regulator driver data | |
3694 | * @regulator: regulator | |
3695 | * @data: data | |
3696 | */ | |
3697 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3698 | { | |
3699 | regulator->rdev->reg_data = data; | |
3700 | } | |
3701 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3702 | ||
3703 | /** | |
3704 | * regulator_get_id - get regulator ID | |
69279fb9 | 3705 | * @rdev: regulator |
414c70cb LG |
3706 | */ |
3707 | int rdev_get_id(struct regulator_dev *rdev) | |
3708 | { | |
3709 | return rdev->desc->id; | |
3710 | } | |
3711 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3712 | ||
a5766f11 LG |
3713 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3714 | { | |
3715 | return &rdev->dev; | |
3716 | } | |
3717 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3718 | ||
3719 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3720 | { | |
3721 | return reg_init_data->driver_data; | |
3722 | } | |
3723 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3724 | ||
ba55a974 MB |
3725 | #ifdef CONFIG_DEBUG_FS |
3726 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3727 | size_t count, loff_t *ppos) | |
3728 | { | |
3729 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3730 | ssize_t len, ret = 0; | |
3731 | struct regulator_map *map; | |
3732 | ||
3733 | if (!buf) | |
3734 | return -ENOMEM; | |
3735 | ||
3736 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3737 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3738 | "%s -> %s.%s\n", | |
3739 | rdev_get_name(map->regulator), map->dev_name, | |
3740 | map->supply); | |
3741 | if (len >= 0) | |
3742 | ret += len; | |
3743 | if (ret > PAGE_SIZE) { | |
3744 | ret = PAGE_SIZE; | |
3745 | break; | |
3746 | } | |
3747 | } | |
3748 | ||
3749 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3750 | ||
3751 | kfree(buf); | |
3752 | ||
3753 | return ret; | |
3754 | } | |
24751434 | 3755 | #endif |
ba55a974 MB |
3756 | |
3757 | static const struct file_operations supply_map_fops = { | |
24751434 | 3758 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3759 | .read = supply_map_read_file, |
3760 | .llseek = default_llseek, | |
ba55a974 | 3761 | #endif |
24751434 | 3762 | }; |
ba55a974 | 3763 | |
414c70cb LG |
3764 | static int __init regulator_init(void) |
3765 | { | |
34abbd68 MB |
3766 | int ret; |
3767 | ||
34abbd68 MB |
3768 | ret = class_register(®ulator_class); |
3769 | ||
1130e5b3 | 3770 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3771 | if (!debugfs_root) |
1130e5b3 | 3772 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3773 | |
f4d562c6 MB |
3774 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3775 | &supply_map_fops); | |
1130e5b3 | 3776 | |
34abbd68 MB |
3777 | regulator_dummy_init(); |
3778 | ||
3779 | return ret; | |
414c70cb LG |
3780 | } |
3781 | ||
3782 | /* init early to allow our consumers to complete system booting */ | |
3783 | core_initcall(regulator_init); | |
ca725561 MB |
3784 | |
3785 | static int __init regulator_init_complete(void) | |
3786 | { | |
3787 | struct regulator_dev *rdev; | |
3788 | struct regulator_ops *ops; | |
3789 | struct regulation_constraints *c; | |
3790 | int enabled, ret; | |
ca725561 | 3791 | |
86f5fcfc MB |
3792 | /* |
3793 | * Since DT doesn't provide an idiomatic mechanism for | |
3794 | * enabling full constraints and since it's much more natural | |
3795 | * with DT to provide them just assume that a DT enabled | |
3796 | * system has full constraints. | |
3797 | */ | |
3798 | if (of_have_populated_dt()) | |
3799 | has_full_constraints = true; | |
3800 | ||
ca725561 MB |
3801 | mutex_lock(®ulator_list_mutex); |
3802 | ||
3803 | /* If we have a full configuration then disable any regulators | |
3804 | * which are not in use or always_on. This will become the | |
3805 | * default behaviour in the future. | |
3806 | */ | |
3807 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3808 | ops = rdev->desc->ops; | |
3809 | c = rdev->constraints; | |
3810 | ||
f25e0b4f | 3811 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3812 | continue; |
3813 | ||
3814 | mutex_lock(&rdev->mutex); | |
3815 | ||
3816 | if (rdev->use_count) | |
3817 | goto unlock; | |
3818 | ||
3819 | /* If we can't read the status assume it's on. */ | |
3820 | if (ops->is_enabled) | |
3821 | enabled = ops->is_enabled(rdev); | |
3822 | else | |
3823 | enabled = 1; | |
3824 | ||
3825 | if (!enabled) | |
3826 | goto unlock; | |
3827 | ||
3828 | if (has_full_constraints) { | |
3829 | /* We log since this may kill the system if it | |
3830 | * goes wrong. */ | |
5da84fd9 | 3831 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3832 | ret = ops->disable(rdev); |
3833 | if (ret != 0) { | |
5da84fd9 | 3834 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3835 | } |
3836 | } else { | |
3837 | /* The intention is that in future we will | |
3838 | * assume that full constraints are provided | |
3839 | * so warn even if we aren't going to do | |
3840 | * anything here. | |
3841 | */ | |
5da84fd9 | 3842 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3843 | } |
3844 | ||
3845 | unlock: | |
3846 | mutex_unlock(&rdev->mutex); | |
3847 | } | |
3848 | ||
3849 | mutex_unlock(®ulator_list_mutex); | |
3850 | ||
3851 | return 0; | |
3852 | } | |
3853 | late_initcall(regulator_init_complete); |