Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
1d7372e1 | 16 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
c5e28ed7 | 17 | |
414c70cb LG |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
1130e5b3 | 20 | #include <linux/debugfs.h> |
414c70cb | 21 | #include <linux/device.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
f21e0e81 | 23 | #include <linux/async.h> |
414c70cb LG |
24 | #include <linux/err.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/suspend.h> | |
31aae2be | 27 | #include <linux/delay.h> |
69511a45 RN |
28 | #include <linux/of.h> |
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 MB |
38 | #include "dummy.h" |
39 | ||
7d51a0db MB |
40 | #define rdev_crit(rdev, fmt, ...) \ |
41 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
42 | #define rdev_err(rdev, fmt, ...) \ |
43 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
44 | #define rdev_warn(rdev, fmt, ...) \ | |
45 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_info(rdev, fmt, ...) \ | |
47 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_dbg(rdev, fmt, ...) \ | |
49 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | ||
414c70cb LG |
51 | static DEFINE_MUTEX(regulator_list_mutex); |
52 | static LIST_HEAD(regulator_list); | |
53 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 54 | static bool has_full_constraints; |
688fe99a | 55 | static bool board_wants_dummy_regulator; |
414c70cb | 56 | |
1130e5b3 MB |
57 | #ifdef CONFIG_DEBUG_FS |
58 | static struct dentry *debugfs_root; | |
59 | #endif | |
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 | ||
414c70cb LG |
73 | /* |
74 | * struct regulator | |
75 | * | |
76 | * One for each consumer device. | |
77 | */ | |
78 | struct regulator { | |
79 | struct device *dev; | |
80 | struct list_head list; | |
81 | int uA_load; | |
82 | int min_uV; | |
83 | int max_uV; | |
414c70cb LG |
84 | char *supply_name; |
85 | struct device_attribute dev_attr; | |
86 | struct regulator_dev *rdev; | |
5de70519 MB |
87 | #ifdef CONFIG_DEBUG_FS |
88 | struct dentry *debugfs; | |
89 | #endif | |
414c70cb LG |
90 | }; |
91 | ||
92 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 93 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
94 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
95 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
96 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
97 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
98 | unsigned long event, void *data); | |
75790251 MB |
99 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
100 | int min_uV, int max_uV); | |
3801b86a MB |
101 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
102 | struct device *dev, | |
103 | const char *supply_name); | |
414c70cb | 104 | |
1083c393 MB |
105 | static const char *rdev_get_name(struct regulator_dev *rdev) |
106 | { | |
107 | if (rdev->constraints && rdev->constraints->name) | |
108 | return rdev->constraints->name; | |
109 | else if (rdev->desc->name) | |
110 | return rdev->desc->name; | |
111 | else | |
112 | return ""; | |
113 | } | |
114 | ||
414c70cb LG |
115 | /* gets the regulator for a given consumer device */ |
116 | static struct regulator *get_device_regulator(struct device *dev) | |
117 | { | |
118 | struct regulator *regulator = NULL; | |
119 | struct regulator_dev *rdev; | |
120 | ||
121 | mutex_lock(®ulator_list_mutex); | |
122 | list_for_each_entry(rdev, ®ulator_list, list) { | |
123 | mutex_lock(&rdev->mutex); | |
124 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
125 | if (regulator->dev == dev) { | |
126 | mutex_unlock(&rdev->mutex); | |
127 | mutex_unlock(®ulator_list_mutex); | |
128 | return regulator; | |
129 | } | |
130 | } | |
131 | mutex_unlock(&rdev->mutex); | |
132 | } | |
133 | mutex_unlock(®ulator_list_mutex); | |
134 | return NULL; | |
135 | } | |
136 | ||
69511a45 RN |
137 | /** |
138 | * of_get_regulator - get a regulator device node based on supply name | |
139 | * @dev: Device pointer for the consumer (of regulator) device | |
140 | * @supply: regulator supply name | |
141 | * | |
142 | * Extract the regulator device node corresponding to the supply name. | |
143 | * retruns the device node corresponding to the regulator if found, else | |
144 | * returns NULL. | |
145 | */ | |
146 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
147 | { | |
148 | struct device_node *regnode = NULL; | |
149 | char prop_name[32]; /* 32 is max size of property name */ | |
150 | ||
151 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
152 | ||
153 | snprintf(prop_name, 32, "%s-supply", supply); | |
154 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
155 | ||
156 | if (!regnode) { | |
157 | dev_warn(dev, "%s property in node %s references invalid phandle", | |
158 | prop_name, dev->of_node->full_name); | |
159 | return NULL; | |
160 | } | |
161 | return regnode; | |
162 | } | |
163 | ||
414c70cb LG |
164 | /* Platform voltage constraint check */ |
165 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
166 | int *min_uV, int *max_uV) | |
167 | { | |
168 | BUG_ON(*min_uV > *max_uV); | |
169 | ||
170 | if (!rdev->constraints) { | |
5da84fd9 | 171 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
172 | return -ENODEV; |
173 | } | |
174 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 175 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
176 | return -EPERM; |
177 | } | |
178 | ||
179 | if (*max_uV > rdev->constraints->max_uV) | |
180 | *max_uV = rdev->constraints->max_uV; | |
181 | if (*min_uV < rdev->constraints->min_uV) | |
182 | *min_uV = rdev->constraints->min_uV; | |
183 | ||
89f425ed MB |
184 | if (*min_uV > *max_uV) { |
185 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 186 | *min_uV, *max_uV); |
414c70cb | 187 | return -EINVAL; |
89f425ed | 188 | } |
414c70cb LG |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
05fda3b1 TP |
193 | /* Make sure we select a voltage that suits the needs of all |
194 | * regulator consumers | |
195 | */ | |
196 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
197 | int *min_uV, int *max_uV) | |
198 | { | |
199 | struct regulator *regulator; | |
200 | ||
201 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
202 | /* |
203 | * Assume consumers that didn't say anything are OK | |
204 | * with anything in the constraint range. | |
205 | */ | |
206 | if (!regulator->min_uV && !regulator->max_uV) | |
207 | continue; | |
208 | ||
05fda3b1 TP |
209 | if (*max_uV > regulator->max_uV) |
210 | *max_uV = regulator->max_uV; | |
211 | if (*min_uV < regulator->min_uV) | |
212 | *min_uV = regulator->min_uV; | |
213 | } | |
214 | ||
215 | if (*min_uV > *max_uV) | |
216 | return -EINVAL; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
414c70cb LG |
221 | /* current constraint check */ |
222 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
223 | int *min_uA, int *max_uA) | |
224 | { | |
225 | BUG_ON(*min_uA > *max_uA); | |
226 | ||
227 | if (!rdev->constraints) { | |
5da84fd9 | 228 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
229 | return -ENODEV; |
230 | } | |
231 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 232 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
233 | return -EPERM; |
234 | } | |
235 | ||
236 | if (*max_uA > rdev->constraints->max_uA) | |
237 | *max_uA = rdev->constraints->max_uA; | |
238 | if (*min_uA < rdev->constraints->min_uA) | |
239 | *min_uA = rdev->constraints->min_uA; | |
240 | ||
89f425ed MB |
241 | if (*min_uA > *max_uA) { |
242 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 243 | *min_uA, *max_uA); |
414c70cb | 244 | return -EINVAL; |
89f425ed | 245 | } |
414c70cb LG |
246 | |
247 | return 0; | |
248 | } | |
249 | ||
250 | /* operating mode constraint check */ | |
2c608234 | 251 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 252 | { |
2c608234 | 253 | switch (*mode) { |
e573520b DB |
254 | case REGULATOR_MODE_FAST: |
255 | case REGULATOR_MODE_NORMAL: | |
256 | case REGULATOR_MODE_IDLE: | |
257 | case REGULATOR_MODE_STANDBY: | |
258 | break; | |
259 | default: | |
89f425ed | 260 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
261 | return -EINVAL; |
262 | } | |
263 | ||
414c70cb | 264 | if (!rdev->constraints) { |
5da84fd9 | 265 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
266 | return -ENODEV; |
267 | } | |
268 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 269 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
270 | return -EPERM; |
271 | } | |
2c608234 MB |
272 | |
273 | /* The modes are bitmasks, the most power hungry modes having | |
274 | * the lowest values. If the requested mode isn't supported | |
275 | * try higher modes. */ | |
276 | while (*mode) { | |
277 | if (rdev->constraints->valid_modes_mask & *mode) | |
278 | return 0; | |
279 | *mode /= 2; | |
414c70cb | 280 | } |
2c608234 MB |
281 | |
282 | return -EINVAL; | |
414c70cb LG |
283 | } |
284 | ||
285 | /* dynamic regulator mode switching constraint check */ | |
286 | static int regulator_check_drms(struct regulator_dev *rdev) | |
287 | { | |
288 | if (!rdev->constraints) { | |
5da84fd9 | 289 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
290 | return -ENODEV; |
291 | } | |
292 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 293 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
294 | return -EPERM; |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
299 | static ssize_t device_requested_uA_show(struct device *dev, | |
300 | struct device_attribute *attr, char *buf) | |
301 | { | |
302 | struct regulator *regulator; | |
303 | ||
304 | regulator = get_device_regulator(dev); | |
305 | if (regulator == NULL) | |
306 | return 0; | |
307 | ||
308 | return sprintf(buf, "%d\n", regulator->uA_load); | |
309 | } | |
310 | ||
311 | static ssize_t regulator_uV_show(struct device *dev, | |
312 | struct device_attribute *attr, char *buf) | |
313 | { | |
a5766f11 | 314 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
315 | ssize_t ret; |
316 | ||
317 | mutex_lock(&rdev->mutex); | |
318 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
319 | mutex_unlock(&rdev->mutex); | |
320 | ||
321 | return ret; | |
322 | } | |
7ad68e2f | 323 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
324 | |
325 | static ssize_t regulator_uA_show(struct device *dev, | |
326 | struct device_attribute *attr, char *buf) | |
327 | { | |
a5766f11 | 328 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
329 | |
330 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
331 | } | |
7ad68e2f | 332 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 333 | |
bc558a60 MB |
334 | static ssize_t regulator_name_show(struct device *dev, |
335 | struct device_attribute *attr, char *buf) | |
336 | { | |
337 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 338 | |
1083c393 | 339 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
340 | } |
341 | ||
4fca9545 | 342 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 343 | { |
414c70cb LG |
344 | switch (mode) { |
345 | case REGULATOR_MODE_FAST: | |
346 | return sprintf(buf, "fast\n"); | |
347 | case REGULATOR_MODE_NORMAL: | |
348 | return sprintf(buf, "normal\n"); | |
349 | case REGULATOR_MODE_IDLE: | |
350 | return sprintf(buf, "idle\n"); | |
351 | case REGULATOR_MODE_STANDBY: | |
352 | return sprintf(buf, "standby\n"); | |
353 | } | |
354 | return sprintf(buf, "unknown\n"); | |
355 | } | |
356 | ||
4fca9545 DB |
357 | static ssize_t regulator_opmode_show(struct device *dev, |
358 | struct device_attribute *attr, char *buf) | |
414c70cb | 359 | { |
a5766f11 | 360 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 361 | |
4fca9545 DB |
362 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
363 | } | |
7ad68e2f | 364 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
365 | |
366 | static ssize_t regulator_print_state(char *buf, int state) | |
367 | { | |
414c70cb LG |
368 | if (state > 0) |
369 | return sprintf(buf, "enabled\n"); | |
370 | else if (state == 0) | |
371 | return sprintf(buf, "disabled\n"); | |
372 | else | |
373 | return sprintf(buf, "unknown\n"); | |
374 | } | |
375 | ||
4fca9545 DB |
376 | static ssize_t regulator_state_show(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
379 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
380 | ssize_t ret; |
381 | ||
382 | mutex_lock(&rdev->mutex); | |
383 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
384 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 385 | |
9332546f | 386 | return ret; |
4fca9545 | 387 | } |
7ad68e2f | 388 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 389 | |
853116a1 DB |
390 | static ssize_t regulator_status_show(struct device *dev, |
391 | struct device_attribute *attr, char *buf) | |
392 | { | |
393 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
394 | int status; | |
395 | char *label; | |
396 | ||
397 | status = rdev->desc->ops->get_status(rdev); | |
398 | if (status < 0) | |
399 | return status; | |
400 | ||
401 | switch (status) { | |
402 | case REGULATOR_STATUS_OFF: | |
403 | label = "off"; | |
404 | break; | |
405 | case REGULATOR_STATUS_ON: | |
406 | label = "on"; | |
407 | break; | |
408 | case REGULATOR_STATUS_ERROR: | |
409 | label = "error"; | |
410 | break; | |
411 | case REGULATOR_STATUS_FAST: | |
412 | label = "fast"; | |
413 | break; | |
414 | case REGULATOR_STATUS_NORMAL: | |
415 | label = "normal"; | |
416 | break; | |
417 | case REGULATOR_STATUS_IDLE: | |
418 | label = "idle"; | |
419 | break; | |
420 | case REGULATOR_STATUS_STANDBY: | |
421 | label = "standby"; | |
422 | break; | |
423 | default: | |
424 | return -ERANGE; | |
425 | } | |
426 | ||
427 | return sprintf(buf, "%s\n", label); | |
428 | } | |
429 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
430 | ||
414c70cb LG |
431 | static ssize_t regulator_min_uA_show(struct device *dev, |
432 | struct device_attribute *attr, char *buf) | |
433 | { | |
a5766f11 | 434 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
435 | |
436 | if (!rdev->constraints) | |
437 | return sprintf(buf, "constraint not defined\n"); | |
438 | ||
439 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
440 | } | |
7ad68e2f | 441 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
442 | |
443 | static ssize_t regulator_max_uA_show(struct device *dev, | |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
447 | |
448 | if (!rdev->constraints) | |
449 | return sprintf(buf, "constraint not defined\n"); | |
450 | ||
451 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
452 | } | |
7ad68e2f | 453 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
454 | |
455 | static ssize_t regulator_min_uV_show(struct device *dev, | |
456 | struct device_attribute *attr, char *buf) | |
457 | { | |
a5766f11 | 458 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
459 | |
460 | if (!rdev->constraints) | |
461 | return sprintf(buf, "constraint not defined\n"); | |
462 | ||
463 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
464 | } | |
7ad68e2f | 465 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
466 | |
467 | static ssize_t regulator_max_uV_show(struct device *dev, | |
468 | struct device_attribute *attr, char *buf) | |
469 | { | |
a5766f11 | 470 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
471 | |
472 | if (!rdev->constraints) | |
473 | return sprintf(buf, "constraint not defined\n"); | |
474 | ||
475 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
476 | } | |
7ad68e2f | 477 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
478 | |
479 | static ssize_t regulator_total_uA_show(struct device *dev, | |
480 | struct device_attribute *attr, char *buf) | |
481 | { | |
a5766f11 | 482 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
483 | struct regulator *regulator; |
484 | int uA = 0; | |
485 | ||
486 | mutex_lock(&rdev->mutex); | |
487 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 488 | uA += regulator->uA_load; |
414c70cb LG |
489 | mutex_unlock(&rdev->mutex); |
490 | return sprintf(buf, "%d\n", uA); | |
491 | } | |
7ad68e2f | 492 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
493 | |
494 | static ssize_t regulator_num_users_show(struct device *dev, | |
495 | struct device_attribute *attr, char *buf) | |
496 | { | |
a5766f11 | 497 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
498 | return sprintf(buf, "%d\n", rdev->use_count); |
499 | } | |
500 | ||
501 | static ssize_t regulator_type_show(struct device *dev, | |
502 | struct device_attribute *attr, char *buf) | |
503 | { | |
a5766f11 | 504 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
505 | |
506 | switch (rdev->desc->type) { | |
507 | case REGULATOR_VOLTAGE: | |
508 | return sprintf(buf, "voltage\n"); | |
509 | case REGULATOR_CURRENT: | |
510 | return sprintf(buf, "current\n"); | |
511 | } | |
512 | return sprintf(buf, "unknown\n"); | |
513 | } | |
514 | ||
515 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
516 | struct device_attribute *attr, char *buf) | |
517 | { | |
a5766f11 | 518 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 519 | |
414c70cb LG |
520 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
521 | } | |
7ad68e2f DB |
522 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
523 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
524 | |
525 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
526 | struct device_attribute *attr, char *buf) | |
527 | { | |
a5766f11 | 528 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 529 | |
414c70cb LG |
530 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
531 | } | |
7ad68e2f DB |
532 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
533 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
534 | |
535 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
536 | struct device_attribute *attr, char *buf) | |
537 | { | |
a5766f11 | 538 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 539 | |
414c70cb LG |
540 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
541 | } | |
7ad68e2f DB |
542 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
543 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 544 | |
414c70cb LG |
545 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
546 | struct device_attribute *attr, char *buf) | |
547 | { | |
a5766f11 | 548 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 549 | |
4fca9545 DB |
550 | return regulator_print_opmode(buf, |
551 | rdev->constraints->state_mem.mode); | |
414c70cb | 552 | } |
7ad68e2f DB |
553 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
554 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
555 | |
556 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
557 | struct device_attribute *attr, char *buf) | |
558 | { | |
a5766f11 | 559 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 560 | |
4fca9545 DB |
561 | return regulator_print_opmode(buf, |
562 | rdev->constraints->state_disk.mode); | |
414c70cb | 563 | } |
7ad68e2f DB |
564 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
565 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
566 | |
567 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
568 | struct device_attribute *attr, char *buf) | |
569 | { | |
a5766f11 | 570 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 571 | |
4fca9545 DB |
572 | return regulator_print_opmode(buf, |
573 | rdev->constraints->state_standby.mode); | |
414c70cb | 574 | } |
7ad68e2f DB |
575 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
576 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
577 | |
578 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
579 | struct device_attribute *attr, char *buf) | |
580 | { | |
a5766f11 | 581 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 582 | |
4fca9545 DB |
583 | return regulator_print_state(buf, |
584 | rdev->constraints->state_mem.enabled); | |
414c70cb | 585 | } |
7ad68e2f DB |
586 | static DEVICE_ATTR(suspend_mem_state, 0444, |
587 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
588 | |
589 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
590 | struct device_attribute *attr, char *buf) | |
591 | { | |
a5766f11 | 592 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 593 | |
4fca9545 DB |
594 | return regulator_print_state(buf, |
595 | rdev->constraints->state_disk.enabled); | |
414c70cb | 596 | } |
7ad68e2f DB |
597 | static DEVICE_ATTR(suspend_disk_state, 0444, |
598 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
599 | |
600 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
601 | struct device_attribute *attr, char *buf) | |
602 | { | |
a5766f11 | 603 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 604 | |
4fca9545 DB |
605 | return regulator_print_state(buf, |
606 | rdev->constraints->state_standby.enabled); | |
414c70cb | 607 | } |
7ad68e2f DB |
608 | static DEVICE_ATTR(suspend_standby_state, 0444, |
609 | regulator_suspend_standby_state_show, NULL); | |
610 | ||
bc558a60 | 611 | |
7ad68e2f DB |
612 | /* |
613 | * These are the only attributes are present for all regulators. | |
614 | * Other attributes are a function of regulator functionality. | |
615 | */ | |
414c70cb | 616 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 617 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
618 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
619 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
620 | __ATTR_NULL, |
621 | }; | |
622 | ||
623 | static void regulator_dev_release(struct device *dev) | |
624 | { | |
a5766f11 | 625 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
626 | kfree(rdev); |
627 | } | |
628 | ||
629 | static struct class regulator_class = { | |
630 | .name = "regulator", | |
631 | .dev_release = regulator_dev_release, | |
632 | .dev_attrs = regulator_dev_attrs, | |
633 | }; | |
634 | ||
635 | /* Calculate the new optimum regulator operating mode based on the new total | |
636 | * consumer load. All locks held by caller */ | |
637 | static void drms_uA_update(struct regulator_dev *rdev) | |
638 | { | |
639 | struct regulator *sibling; | |
640 | int current_uA = 0, output_uV, input_uV, err; | |
641 | unsigned int mode; | |
642 | ||
643 | err = regulator_check_drms(rdev); | |
644 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
645 | (!rdev->desc->ops->get_voltage && |
646 | !rdev->desc->ops->get_voltage_sel) || | |
647 | !rdev->desc->ops->set_mode) | |
036de8ef | 648 | return; |
414c70cb LG |
649 | |
650 | /* get output voltage */ | |
1bf5a1f8 | 651 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
652 | if (output_uV <= 0) |
653 | return; | |
654 | ||
655 | /* get input voltage */ | |
1bf5a1f8 MB |
656 | input_uV = 0; |
657 | if (rdev->supply) | |
658 | input_uV = _regulator_get_voltage(rdev); | |
659 | if (input_uV <= 0) | |
414c70cb LG |
660 | input_uV = rdev->constraints->input_uV; |
661 | if (input_uV <= 0) | |
662 | return; | |
663 | ||
664 | /* calc total requested load */ | |
665 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 666 | current_uA += sibling->uA_load; |
414c70cb LG |
667 | |
668 | /* now get the optimum mode for our new total regulator load */ | |
669 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
670 | output_uV, current_uA); | |
671 | ||
672 | /* check the new mode is allowed */ | |
2c608234 | 673 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
674 | if (err == 0) |
675 | rdev->desc->ops->set_mode(rdev, mode); | |
676 | } | |
677 | ||
678 | static int suspend_set_state(struct regulator_dev *rdev, | |
679 | struct regulator_state *rstate) | |
680 | { | |
681 | int ret = 0; | |
638f85c5 MB |
682 | bool can_set_state; |
683 | ||
684 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
685 | rdev->desc->ops->set_suspend_disable; | |
686 | ||
687 | /* If we have no suspend mode configration don't set anything; | |
688 | * only warn if the driver actually makes the suspend mode | |
689 | * configurable. | |
690 | */ | |
691 | if (!rstate->enabled && !rstate->disabled) { | |
692 | if (can_set_state) | |
5da84fd9 | 693 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
694 | return 0; |
695 | } | |
696 | ||
697 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 698 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
699 | return -EINVAL; |
700 | } | |
414c70cb | 701 | |
638f85c5 | 702 | if (!can_set_state) { |
5da84fd9 | 703 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 704 | return -EINVAL; |
a5766f11 | 705 | } |
414c70cb LG |
706 | |
707 | if (rstate->enabled) | |
708 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
709 | else | |
710 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
711 | if (ret < 0) { | |
5da84fd9 | 712 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
713 | return ret; |
714 | } | |
715 | ||
716 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
717 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
718 | if (ret < 0) { | |
5da84fd9 | 719 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
720 | return ret; |
721 | } | |
722 | } | |
723 | ||
724 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
725 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
726 | if (ret < 0) { | |
5da84fd9 | 727 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
728 | return ret; |
729 | } | |
730 | } | |
731 | return ret; | |
732 | } | |
733 | ||
734 | /* locks held by caller */ | |
735 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
736 | { | |
737 | if (!rdev->constraints) | |
738 | return -EINVAL; | |
739 | ||
740 | switch (state) { | |
741 | case PM_SUSPEND_STANDBY: | |
742 | return suspend_set_state(rdev, | |
743 | &rdev->constraints->state_standby); | |
744 | case PM_SUSPEND_MEM: | |
745 | return suspend_set_state(rdev, | |
746 | &rdev->constraints->state_mem); | |
747 | case PM_SUSPEND_MAX: | |
748 | return suspend_set_state(rdev, | |
749 | &rdev->constraints->state_disk); | |
750 | default: | |
751 | return -EINVAL; | |
752 | } | |
753 | } | |
754 | ||
755 | static void print_constraints(struct regulator_dev *rdev) | |
756 | { | |
757 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 758 | char buf[80] = ""; |
8f031b48 MB |
759 | int count = 0; |
760 | int ret; | |
414c70cb | 761 | |
8f031b48 | 762 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 763 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
764 | count += sprintf(buf + count, "%d mV ", |
765 | constraints->min_uV / 1000); | |
414c70cb | 766 | else |
8f031b48 MB |
767 | count += sprintf(buf + count, "%d <--> %d mV ", |
768 | constraints->min_uV / 1000, | |
769 | constraints->max_uV / 1000); | |
770 | } | |
771 | ||
772 | if (!constraints->min_uV || | |
773 | constraints->min_uV != constraints->max_uV) { | |
774 | ret = _regulator_get_voltage(rdev); | |
775 | if (ret > 0) | |
776 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
777 | } | |
778 | ||
bf5892a8 MB |
779 | if (constraints->uV_offset) |
780 | count += sprintf(buf, "%dmV offset ", | |
781 | constraints->uV_offset / 1000); | |
782 | ||
8f031b48 | 783 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 784 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
785 | count += sprintf(buf + count, "%d mA ", |
786 | constraints->min_uA / 1000); | |
414c70cb | 787 | else |
8f031b48 MB |
788 | count += sprintf(buf + count, "%d <--> %d mA ", |
789 | constraints->min_uA / 1000, | |
790 | constraints->max_uA / 1000); | |
791 | } | |
792 | ||
793 | if (!constraints->min_uA || | |
794 | constraints->min_uA != constraints->max_uA) { | |
795 | ret = _regulator_get_current_limit(rdev); | |
796 | if (ret > 0) | |
e4a6376b | 797 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 798 | } |
8f031b48 | 799 | |
414c70cb LG |
800 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
801 | count += sprintf(buf + count, "fast "); | |
802 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
803 | count += sprintf(buf + count, "normal "); | |
804 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
805 | count += sprintf(buf + count, "idle "); | |
806 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
807 | count += sprintf(buf + count, "standby"); | |
808 | ||
13ce29f8 | 809 | rdev_info(rdev, "%s\n", buf); |
414c70cb LG |
810 | } |
811 | ||
e79055d6 | 812 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 813 | struct regulation_constraints *constraints) |
a5766f11 | 814 | { |
e5fda26c | 815 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
816 | int ret; |
817 | ||
818 | /* do we need to apply the constraint voltage */ | |
819 | if (rdev->constraints->apply_uV && | |
75790251 MB |
820 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
821 | ret = _regulator_do_set_voltage(rdev, | |
822 | rdev->constraints->min_uV, | |
823 | rdev->constraints->max_uV); | |
824 | if (ret < 0) { | |
825 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
826 | rdev->constraints->min_uV); | |
75790251 MB |
827 | return ret; |
828 | } | |
af5866c9 | 829 | } |
e06f5b4f | 830 | |
4367cfdc DB |
831 | /* constrain machine-level voltage specs to fit |
832 | * the actual range supported by this regulator. | |
833 | */ | |
834 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
835 | int count = rdev->desc->n_voltages; | |
836 | int i; | |
837 | int min_uV = INT_MAX; | |
838 | int max_uV = INT_MIN; | |
839 | int cmin = constraints->min_uV; | |
840 | int cmax = constraints->max_uV; | |
841 | ||
3e590918 MB |
842 | /* it's safe to autoconfigure fixed-voltage supplies |
843 | and the constraints are used by list_voltage. */ | |
4367cfdc | 844 | if (count == 1 && !cmin) { |
3e590918 | 845 | cmin = 1; |
4367cfdc | 846 | cmax = INT_MAX; |
3e590918 MB |
847 | constraints->min_uV = cmin; |
848 | constraints->max_uV = cmax; | |
4367cfdc DB |
849 | } |
850 | ||
3e2b9abd MB |
851 | /* voltage constraints are optional */ |
852 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 853 | return 0; |
3e2b9abd | 854 | |
4367cfdc | 855 | /* else require explicit machine-level constraints */ |
3e2b9abd | 856 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 857 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 858 | return -EINVAL; |
4367cfdc DB |
859 | } |
860 | ||
861 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
862 | for (i = 0; i < count; i++) { | |
863 | int value; | |
864 | ||
865 | value = ops->list_voltage(rdev, i); | |
866 | if (value <= 0) | |
867 | continue; | |
868 | ||
869 | /* maybe adjust [min_uV..max_uV] */ | |
870 | if (value >= cmin && value < min_uV) | |
871 | min_uV = value; | |
872 | if (value <= cmax && value > max_uV) | |
873 | max_uV = value; | |
874 | } | |
875 | ||
876 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
877 | if (max_uV < min_uV) { | |
5da84fd9 | 878 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 879 | return -EINVAL; |
4367cfdc DB |
880 | } |
881 | ||
882 | /* use regulator's subset of machine constraints */ | |
883 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
884 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
885 | constraints->min_uV, min_uV); | |
4367cfdc DB |
886 | constraints->min_uV = min_uV; |
887 | } | |
888 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
889 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
890 | constraints->max_uV, max_uV); | |
4367cfdc DB |
891 | constraints->max_uV = max_uV; |
892 | } | |
893 | } | |
894 | ||
e79055d6 MB |
895 | return 0; |
896 | } | |
897 | ||
898 | /** | |
899 | * set_machine_constraints - sets regulator constraints | |
900 | * @rdev: regulator source | |
901 | * @constraints: constraints to apply | |
902 | * | |
903 | * Allows platform initialisation code to define and constrain | |
904 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
905 | * Constraints *must* be set by platform code in order for some | |
906 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
907 | * set_mode. | |
908 | */ | |
909 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 910 | const struct regulation_constraints *constraints) |
e79055d6 MB |
911 | { |
912 | int ret = 0; | |
e79055d6 MB |
913 | struct regulator_ops *ops = rdev->desc->ops; |
914 | ||
9a8f5e07 MB |
915 | if (constraints) |
916 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
917 | GFP_KERNEL); | |
918 | else | |
919 | rdev->constraints = kzalloc(sizeof(*constraints), | |
920 | GFP_KERNEL); | |
f8c12fe3 MB |
921 | if (!rdev->constraints) |
922 | return -ENOMEM; | |
af5866c9 | 923 | |
f8c12fe3 | 924 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
925 | if (ret != 0) |
926 | goto out; | |
927 | ||
a5766f11 | 928 | /* do we need to setup our suspend state */ |
9a8f5e07 | 929 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 930 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 931 | if (ret < 0) { |
5da84fd9 | 932 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
933 | goto out; |
934 | } | |
935 | } | |
a5766f11 | 936 | |
9a8f5e07 | 937 | if (rdev->constraints->initial_mode) { |
a308466c | 938 | if (!ops->set_mode) { |
5da84fd9 | 939 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
940 | ret = -EINVAL; |
941 | goto out; | |
942 | } | |
943 | ||
f8c12fe3 | 944 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 945 | if (ret < 0) { |
5da84fd9 | 946 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
947 | goto out; |
948 | } | |
949 | } | |
950 | ||
cacf90f2 MB |
951 | /* If the constraints say the regulator should be on at this point |
952 | * and we have control then make sure it is enabled. | |
953 | */ | |
f8c12fe3 MB |
954 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
955 | ops->enable) { | |
e5fda26c MB |
956 | ret = ops->enable(rdev); |
957 | if (ret < 0) { | |
5da84fd9 | 958 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
959 | goto out; |
960 | } | |
961 | } | |
962 | ||
a5766f11 | 963 | print_constraints(rdev); |
1a6958e7 | 964 | return 0; |
a5766f11 | 965 | out: |
1a6958e7 AL |
966 | kfree(rdev->constraints); |
967 | rdev->constraints = NULL; | |
a5766f11 LG |
968 | return ret; |
969 | } | |
970 | ||
971 | /** | |
972 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
973 | * @rdev: regulator name |
974 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
975 | * |
976 | * Called by platform initialisation code to set the supply regulator for this | |
977 | * regulator. This ensures that a regulators supply will also be enabled by the | |
978 | * core if it's child is enabled. | |
979 | */ | |
980 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 981 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
982 | { |
983 | int err; | |
984 | ||
3801b86a MB |
985 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
986 | ||
987 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
988 | if (IS_ERR(rdev->supply)) { | |
989 | err = PTR_ERR(rdev->supply); | |
990 | rdev->supply = NULL; | |
991 | return err; | |
a5766f11 | 992 | } |
3801b86a MB |
993 | |
994 | return 0; | |
a5766f11 LG |
995 | } |
996 | ||
997 | /** | |
06c63f93 | 998 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
999 | * @rdev: regulator source |
1000 | * @consumer_dev: device the supply applies to | |
40f9244f | 1001 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1002 | * @supply: symbolic name for supply |
a5766f11 LG |
1003 | * |
1004 | * Allows platform initialisation code to map physical regulator | |
1005 | * sources to symbolic names for supplies for use by devices. Devices | |
1006 | * should use these symbolic names to request regulators, avoiding the | |
1007 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
1008 | * |
1009 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
1010 | */ |
1011 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
1012 | struct device *consumer_dev, const char *consumer_dev_name, |
1013 | const char *supply) | |
a5766f11 LG |
1014 | { |
1015 | struct regulator_map *node; | |
9ed2099e | 1016 | int has_dev; |
a5766f11 | 1017 | |
40f9244f MB |
1018 | if (consumer_dev && consumer_dev_name) |
1019 | return -EINVAL; | |
1020 | ||
1021 | if (!consumer_dev_name && consumer_dev) | |
1022 | consumer_dev_name = dev_name(consumer_dev); | |
1023 | ||
a5766f11 LG |
1024 | if (supply == NULL) |
1025 | return -EINVAL; | |
1026 | ||
9ed2099e MB |
1027 | if (consumer_dev_name != NULL) |
1028 | has_dev = 1; | |
1029 | else | |
1030 | has_dev = 0; | |
1031 | ||
6001e13c | 1032 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1033 | if (node->dev_name && consumer_dev_name) { |
1034 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1035 | continue; | |
1036 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1037 | continue; |
23b5cc2a JN |
1038 | } |
1039 | ||
6001e13c DB |
1040 | if (strcmp(node->supply, supply) != 0) |
1041 | continue; | |
1042 | ||
1043 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
1044 | dev_name(&node->regulator->dev), |
1045 | node->regulator->desc->name, | |
1046 | supply, | |
1047 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1048 | return -EBUSY; |
1049 | } | |
1050 | ||
9ed2099e | 1051 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1052 | if (node == NULL) |
1053 | return -ENOMEM; | |
1054 | ||
1055 | node->regulator = rdev; | |
a5766f11 LG |
1056 | node->supply = supply; |
1057 | ||
9ed2099e MB |
1058 | if (has_dev) { |
1059 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1060 | if (node->dev_name == NULL) { | |
1061 | kfree(node); | |
1062 | return -ENOMEM; | |
1063 | } | |
40f9244f MB |
1064 | } |
1065 | ||
a5766f11 LG |
1066 | list_add(&node->list, ®ulator_map_list); |
1067 | return 0; | |
1068 | } | |
1069 | ||
0f1d747b MR |
1070 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1071 | { | |
1072 | struct regulator_map *node, *n; | |
1073 | ||
1074 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1075 | if (rdev == node->regulator) { | |
1076 | list_del(&node->list); | |
40f9244f | 1077 | kfree(node->dev_name); |
0f1d747b | 1078 | kfree(node); |
0f1d747b MR |
1079 | } |
1080 | } | |
1081 | } | |
1082 | ||
f5726ae3 | 1083 | #define REG_STR_SIZE 64 |
414c70cb LG |
1084 | |
1085 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1086 | struct device *dev, | |
1087 | const char *supply_name) | |
1088 | { | |
1089 | struct regulator *regulator; | |
1090 | char buf[REG_STR_SIZE]; | |
1091 | int err, size; | |
1092 | ||
1093 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1094 | if (regulator == NULL) | |
1095 | return NULL; | |
1096 | ||
1097 | mutex_lock(&rdev->mutex); | |
1098 | regulator->rdev = rdev; | |
1099 | list_add(®ulator->list, &rdev->consumer_list); | |
1100 | ||
1101 | if (dev) { | |
1102 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1103 | size = scnprintf(buf, REG_STR_SIZE, |
1104 | "microamps_requested_%s-%s", | |
1105 | dev_name(dev), supply_name); | |
414c70cb LG |
1106 | if (size >= REG_STR_SIZE) |
1107 | goto overflow_err; | |
1108 | ||
1109 | regulator->dev = dev; | |
4f26a2ab | 1110 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1111 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1112 | if (regulator->dev_attr.attr.name == NULL) | |
1113 | goto attr_name_err; | |
1114 | ||
414c70cb LG |
1115 | regulator->dev_attr.attr.mode = 0444; |
1116 | regulator->dev_attr.show = device_requested_uA_show; | |
1117 | err = device_create_file(dev, ®ulator->dev_attr); | |
1118 | if (err < 0) { | |
5da84fd9 | 1119 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1120 | goto attr_name_err; |
1121 | } | |
1122 | ||
1123 | /* also add a link to the device sysfs entry */ | |
1124 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1125 | dev->kobj.name, supply_name); | |
1126 | if (size >= REG_STR_SIZE) | |
1127 | goto attr_err; | |
1128 | ||
1129 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1130 | if (regulator->supply_name == NULL) | |
1131 | goto attr_err; | |
1132 | ||
1133 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1134 | buf); | |
1135 | if (err) { | |
5da84fd9 JP |
1136 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1137 | dev->kobj.name, err); | |
414c70cb LG |
1138 | goto link_name_err; |
1139 | } | |
5de70519 MB |
1140 | } else { |
1141 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1142 | if (regulator->supply_name == NULL) | |
1143 | goto attr_err; | |
1144 | } | |
1145 | ||
1146 | #ifdef CONFIG_DEBUG_FS | |
1147 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, | |
1148 | rdev->debugfs); | |
1149 | if (IS_ERR_OR_NULL(regulator->debugfs)) { | |
1150 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
1151 | regulator->debugfs = NULL; | |
1152 | } else { | |
1153 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1154 | ®ulator->uA_load); | |
1155 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1156 | ®ulator->min_uV); | |
1157 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1158 | ®ulator->max_uV); | |
414c70cb | 1159 | } |
5de70519 MB |
1160 | #endif |
1161 | ||
414c70cb LG |
1162 | mutex_unlock(&rdev->mutex); |
1163 | return regulator; | |
1164 | link_name_err: | |
1165 | kfree(regulator->supply_name); | |
1166 | attr_err: | |
1167 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1168 | attr_name_err: | |
1169 | kfree(regulator->dev_attr.attr.name); | |
1170 | overflow_err: | |
1171 | list_del(®ulator->list); | |
1172 | kfree(regulator); | |
1173 | mutex_unlock(&rdev->mutex); | |
1174 | return NULL; | |
1175 | } | |
1176 | ||
31aae2be MB |
1177 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1178 | { | |
1179 | if (!rdev->desc->ops->enable_time) | |
1180 | return 0; | |
1181 | return rdev->desc->ops->enable_time(rdev); | |
1182 | } | |
1183 | ||
69511a45 RN |
1184 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
1185 | const char *supply) | |
1186 | { | |
1187 | struct regulator_dev *r; | |
1188 | struct device_node *node; | |
1189 | ||
1190 | /* first do a dt based lookup */ | |
1191 | if (dev && dev->of_node) { | |
1192 | node = of_get_regulator(dev, supply); | |
1193 | if (node) | |
1194 | list_for_each_entry(r, ®ulator_list, list) | |
1195 | if (r->dev.parent && | |
1196 | node == r->dev.of_node) | |
1197 | return r; | |
1198 | } | |
1199 | ||
1200 | /* if not found, try doing it non-dt way */ | |
1201 | list_for_each_entry(r, ®ulator_list, list) | |
1202 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1203 | return r; | |
1204 | ||
1205 | return NULL; | |
1206 | } | |
1207 | ||
5ffbd136 MB |
1208 | /* Internal regulator request function */ |
1209 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1210 | int exclusive) | |
414c70cb LG |
1211 | { |
1212 | struct regulator_dev *rdev; | |
1213 | struct regulator_map *map; | |
1214 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1215 | const char *devname = NULL; |
5ffbd136 | 1216 | int ret; |
414c70cb LG |
1217 | |
1218 | if (id == NULL) { | |
5da84fd9 | 1219 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1220 | return regulator; |
1221 | } | |
1222 | ||
40f9244f MB |
1223 | if (dev) |
1224 | devname = dev_name(dev); | |
1225 | ||
414c70cb LG |
1226 | mutex_lock(®ulator_list_mutex); |
1227 | ||
69511a45 RN |
1228 | rdev = regulator_dev_lookup(dev, id); |
1229 | if (rdev) | |
1230 | goto found; | |
1231 | ||
414c70cb | 1232 | list_for_each_entry(map, ®ulator_map_list, list) { |
40f9244f MB |
1233 | /* If the mapping has a device set up it must match */ |
1234 | if (map->dev_name && | |
1235 | (!devname || strcmp(map->dev_name, devname))) | |
1236 | continue; | |
1237 | ||
1238 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1239 | rdev = map->regulator; |
414c70cb | 1240 | goto found; |
a5766f11 | 1241 | } |
414c70cb | 1242 | } |
34abbd68 | 1243 | |
688fe99a MB |
1244 | if (board_wants_dummy_regulator) { |
1245 | rdev = dummy_regulator_rdev; | |
1246 | goto found; | |
1247 | } | |
1248 | ||
34abbd68 MB |
1249 | #ifdef CONFIG_REGULATOR_DUMMY |
1250 | if (!devname) | |
1251 | devname = "deviceless"; | |
1252 | ||
1253 | /* If the board didn't flag that it was fully constrained then | |
1254 | * substitute in a dummy regulator so consumers can continue. | |
1255 | */ | |
1256 | if (!has_full_constraints) { | |
5da84fd9 JP |
1257 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1258 | devname, id); | |
34abbd68 MB |
1259 | rdev = dummy_regulator_rdev; |
1260 | goto found; | |
1261 | } | |
1262 | #endif | |
1263 | ||
414c70cb LG |
1264 | mutex_unlock(®ulator_list_mutex); |
1265 | return regulator; | |
1266 | ||
1267 | found: | |
5ffbd136 MB |
1268 | if (rdev->exclusive) { |
1269 | regulator = ERR_PTR(-EPERM); | |
1270 | goto out; | |
1271 | } | |
1272 | ||
1273 | if (exclusive && rdev->open_count) { | |
1274 | regulator = ERR_PTR(-EBUSY); | |
1275 | goto out; | |
1276 | } | |
1277 | ||
a5766f11 LG |
1278 | if (!try_module_get(rdev->owner)) |
1279 | goto out; | |
1280 | ||
414c70cb LG |
1281 | regulator = create_regulator(rdev, dev, id); |
1282 | if (regulator == NULL) { | |
1283 | regulator = ERR_PTR(-ENOMEM); | |
1284 | module_put(rdev->owner); | |
bcda4321 | 1285 | goto out; |
414c70cb LG |
1286 | } |
1287 | ||
5ffbd136 MB |
1288 | rdev->open_count++; |
1289 | if (exclusive) { | |
1290 | rdev->exclusive = 1; | |
1291 | ||
1292 | ret = _regulator_is_enabled(rdev); | |
1293 | if (ret > 0) | |
1294 | rdev->use_count = 1; | |
1295 | else | |
1296 | rdev->use_count = 0; | |
1297 | } | |
1298 | ||
a5766f11 | 1299 | out: |
414c70cb | 1300 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1301 | |
414c70cb LG |
1302 | return regulator; |
1303 | } | |
5ffbd136 MB |
1304 | |
1305 | /** | |
1306 | * regulator_get - lookup and obtain a reference to a regulator. | |
1307 | * @dev: device for regulator "consumer" | |
1308 | * @id: Supply name or regulator ID. | |
1309 | * | |
1310 | * Returns a struct regulator corresponding to the regulator producer, | |
1311 | * or IS_ERR() condition containing errno. | |
1312 | * | |
1313 | * Use of supply names configured via regulator_set_device_supply() is | |
1314 | * strongly encouraged. It is recommended that the supply name used | |
1315 | * should match the name used for the supply and/or the relevant | |
1316 | * device pins in the datasheet. | |
1317 | */ | |
1318 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1319 | { | |
1320 | return _regulator_get(dev, id, 0); | |
1321 | } | |
414c70cb LG |
1322 | EXPORT_SYMBOL_GPL(regulator_get); |
1323 | ||
5ffbd136 MB |
1324 | /** |
1325 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1326 | * @dev: device for regulator "consumer" | |
1327 | * @id: Supply name or regulator ID. | |
1328 | * | |
1329 | * Returns a struct regulator corresponding to the regulator producer, | |
1330 | * or IS_ERR() condition containing errno. Other consumers will be | |
1331 | * unable to obtain this reference is held and the use count for the | |
1332 | * regulator will be initialised to reflect the current state of the | |
1333 | * regulator. | |
1334 | * | |
1335 | * This is intended for use by consumers which cannot tolerate shared | |
1336 | * use of the regulator such as those which need to force the | |
1337 | * regulator off for correct operation of the hardware they are | |
1338 | * controlling. | |
1339 | * | |
1340 | * Use of supply names configured via regulator_set_device_supply() is | |
1341 | * strongly encouraged. It is recommended that the supply name used | |
1342 | * should match the name used for the supply and/or the relevant | |
1343 | * device pins in the datasheet. | |
1344 | */ | |
1345 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1346 | { | |
1347 | return _regulator_get(dev, id, 1); | |
1348 | } | |
1349 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1350 | ||
414c70cb LG |
1351 | /** |
1352 | * regulator_put - "free" the regulator source | |
1353 | * @regulator: regulator source | |
1354 | * | |
1355 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1356 | * regulator source are balanced by regulator_disable calls prior to calling | |
1357 | * this function. | |
1358 | */ | |
1359 | void regulator_put(struct regulator *regulator) | |
1360 | { | |
1361 | struct regulator_dev *rdev; | |
1362 | ||
1363 | if (regulator == NULL || IS_ERR(regulator)) | |
1364 | return; | |
1365 | ||
414c70cb LG |
1366 | mutex_lock(®ulator_list_mutex); |
1367 | rdev = regulator->rdev; | |
1368 | ||
5de70519 MB |
1369 | #ifdef CONFIG_DEBUG_FS |
1370 | debugfs_remove_recursive(regulator->debugfs); | |
1371 | #endif | |
1372 | ||
414c70cb LG |
1373 | /* remove any sysfs entries */ |
1374 | if (regulator->dev) { | |
1375 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
414c70cb LG |
1376 | device_remove_file(regulator->dev, ®ulator->dev_attr); |
1377 | kfree(regulator->dev_attr.attr.name); | |
1378 | } | |
5de70519 | 1379 | kfree(regulator->supply_name); |
414c70cb LG |
1380 | list_del(®ulator->list); |
1381 | kfree(regulator); | |
1382 | ||
5ffbd136 MB |
1383 | rdev->open_count--; |
1384 | rdev->exclusive = 0; | |
1385 | ||
414c70cb LG |
1386 | module_put(rdev->owner); |
1387 | mutex_unlock(®ulator_list_mutex); | |
1388 | } | |
1389 | EXPORT_SYMBOL_GPL(regulator_put); | |
1390 | ||
9a2372fa MB |
1391 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1392 | { | |
1393 | if (!rdev->constraints) | |
1394 | return 0; | |
1395 | ||
1396 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1397 | return 1; | |
1398 | else | |
1399 | return 0; | |
1400 | } | |
1401 | ||
414c70cb LG |
1402 | /* locks held by regulator_enable() */ |
1403 | static int _regulator_enable(struct regulator_dev *rdev) | |
1404 | { | |
31aae2be | 1405 | int ret, delay; |
414c70cb | 1406 | |
414c70cb | 1407 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1408 | if (rdev->constraints && |
1409 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1410 | drms_uA_update(rdev); | |
414c70cb | 1411 | |
9a2372fa MB |
1412 | if (rdev->use_count == 0) { |
1413 | /* The regulator may on if it's not switchable or left on */ | |
1414 | ret = _regulator_is_enabled(rdev); | |
1415 | if (ret == -EINVAL || ret == 0) { | |
1416 | if (!_regulator_can_change_status(rdev)) | |
1417 | return -EPERM; | |
1418 | ||
31aae2be | 1419 | if (!rdev->desc->ops->enable) |
9a2372fa | 1420 | return -EINVAL; |
31aae2be MB |
1421 | |
1422 | /* Query before enabling in case configuration | |
25985edc | 1423 | * dependent. */ |
31aae2be MB |
1424 | ret = _regulator_get_enable_time(rdev); |
1425 | if (ret >= 0) { | |
1426 | delay = ret; | |
1427 | } else { | |
5da84fd9 | 1428 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1429 | ret); |
31aae2be | 1430 | delay = 0; |
9a2372fa | 1431 | } |
31aae2be | 1432 | |
02fa3ec0 MB |
1433 | trace_regulator_enable(rdev_get_name(rdev)); |
1434 | ||
31aae2be MB |
1435 | /* Allow the regulator to ramp; it would be useful |
1436 | * to extend this for bulk operations so that the | |
1437 | * regulators can ramp together. */ | |
1438 | ret = rdev->desc->ops->enable(rdev); | |
1439 | if (ret < 0) | |
1440 | return ret; | |
1441 | ||
02fa3ec0 MB |
1442 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1443 | ||
e36c1df8 | 1444 | if (delay >= 1000) { |
31aae2be | 1445 | mdelay(delay / 1000); |
e36c1df8 AL |
1446 | udelay(delay % 1000); |
1447 | } else if (delay) { | |
31aae2be | 1448 | udelay(delay); |
e36c1df8 | 1449 | } |
31aae2be | 1450 | |
02fa3ec0 MB |
1451 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1452 | ||
a7433cff | 1453 | } else if (ret < 0) { |
5da84fd9 | 1454 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1455 | return ret; |
1456 | } | |
a7433cff | 1457 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1458 | } |
1459 | ||
9a2372fa MB |
1460 | rdev->use_count++; |
1461 | ||
1462 | return 0; | |
414c70cb LG |
1463 | } |
1464 | ||
1465 | /** | |
1466 | * regulator_enable - enable regulator output | |
1467 | * @regulator: regulator source | |
1468 | * | |
cf7bbcdf MB |
1469 | * Request that the regulator be enabled with the regulator output at |
1470 | * the predefined voltage or current value. Calls to regulator_enable() | |
1471 | * must be balanced with calls to regulator_disable(). | |
1472 | * | |
414c70cb | 1473 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1474 | * hardwired in the regulator. |
414c70cb LG |
1475 | */ |
1476 | int regulator_enable(struct regulator *regulator) | |
1477 | { | |
412aec61 DB |
1478 | struct regulator_dev *rdev = regulator->rdev; |
1479 | int ret = 0; | |
414c70cb | 1480 | |
3801b86a MB |
1481 | if (rdev->supply) { |
1482 | ret = regulator_enable(rdev->supply); | |
1483 | if (ret != 0) | |
1484 | return ret; | |
1485 | } | |
1486 | ||
412aec61 | 1487 | mutex_lock(&rdev->mutex); |
cd94b505 | 1488 | ret = _regulator_enable(rdev); |
412aec61 | 1489 | mutex_unlock(&rdev->mutex); |
3801b86a | 1490 | |
d1685e4e | 1491 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1492 | regulator_disable(rdev->supply); |
1493 | ||
414c70cb LG |
1494 | return ret; |
1495 | } | |
1496 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1497 | ||
1498 | /* locks held by regulator_disable() */ | |
3801b86a | 1499 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1500 | { |
1501 | int ret = 0; | |
1502 | ||
cd94b505 | 1503 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1504 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1505 | return -EIO; |
1506 | ||
414c70cb | 1507 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1508 | if (rdev->use_count == 1 && |
1509 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1510 | |
1511 | /* we are last user */ | |
9a2372fa MB |
1512 | if (_regulator_can_change_status(rdev) && |
1513 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1514 | trace_regulator_disable(rdev_get_name(rdev)); |
1515 | ||
414c70cb LG |
1516 | ret = rdev->desc->ops->disable(rdev); |
1517 | if (ret < 0) { | |
5da84fd9 | 1518 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1519 | return ret; |
1520 | } | |
84b68263 | 1521 | |
02fa3ec0 MB |
1522 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1523 | ||
84b68263 MB |
1524 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1525 | NULL); | |
414c70cb LG |
1526 | } |
1527 | ||
414c70cb LG |
1528 | rdev->use_count = 0; |
1529 | } else if (rdev->use_count > 1) { | |
1530 | ||
1531 | if (rdev->constraints && | |
1532 | (rdev->constraints->valid_ops_mask & | |
1533 | REGULATOR_CHANGE_DRMS)) | |
1534 | drms_uA_update(rdev); | |
1535 | ||
1536 | rdev->use_count--; | |
1537 | } | |
3801b86a | 1538 | |
414c70cb LG |
1539 | return ret; |
1540 | } | |
1541 | ||
1542 | /** | |
1543 | * regulator_disable - disable regulator output | |
1544 | * @regulator: regulator source | |
1545 | * | |
cf7bbcdf MB |
1546 | * Disable the regulator output voltage or current. Calls to |
1547 | * regulator_enable() must be balanced with calls to | |
1548 | * regulator_disable(). | |
69279fb9 | 1549 | * |
414c70cb | 1550 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1551 | * devices have it enabled, the regulator device supports disabling and |
1552 | * machine constraints permit this operation. | |
414c70cb LG |
1553 | */ |
1554 | int regulator_disable(struct regulator *regulator) | |
1555 | { | |
412aec61 DB |
1556 | struct regulator_dev *rdev = regulator->rdev; |
1557 | int ret = 0; | |
414c70cb | 1558 | |
412aec61 | 1559 | mutex_lock(&rdev->mutex); |
3801b86a | 1560 | ret = _regulator_disable(rdev); |
412aec61 | 1561 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1562 | |
3801b86a MB |
1563 | if (ret == 0 && rdev->supply) |
1564 | regulator_disable(rdev->supply); | |
8cbf811d | 1565 | |
414c70cb LG |
1566 | return ret; |
1567 | } | |
1568 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1569 | ||
1570 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1571 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1572 | { |
1573 | int ret = 0; | |
1574 | ||
1575 | /* force disable */ | |
1576 | if (rdev->desc->ops->disable) { | |
1577 | /* ah well, who wants to live forever... */ | |
1578 | ret = rdev->desc->ops->disable(rdev); | |
1579 | if (ret < 0) { | |
5da84fd9 | 1580 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1581 | return ret; |
1582 | } | |
1583 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1584 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1585 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1586 | } |
1587 | ||
414c70cb LG |
1588 | return ret; |
1589 | } | |
1590 | ||
1591 | /** | |
1592 | * regulator_force_disable - force disable regulator output | |
1593 | * @regulator: regulator source | |
1594 | * | |
1595 | * Forcibly disable the regulator output voltage or current. | |
1596 | * NOTE: this *will* disable the regulator output even if other consumer | |
1597 | * devices have it enabled. This should be used for situations when device | |
1598 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1599 | */ | |
1600 | int regulator_force_disable(struct regulator *regulator) | |
1601 | { | |
82d15839 | 1602 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1603 | int ret; |
1604 | ||
82d15839 | 1605 | mutex_lock(&rdev->mutex); |
414c70cb | 1606 | regulator->uA_load = 0; |
3801b86a | 1607 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1608 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1609 | |
3801b86a MB |
1610 | if (rdev->supply) |
1611 | while (rdev->open_count--) | |
1612 | regulator_disable(rdev->supply); | |
8cbf811d | 1613 | |
414c70cb LG |
1614 | return ret; |
1615 | } | |
1616 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1617 | ||
da07ecd9 MB |
1618 | static void regulator_disable_work(struct work_struct *work) |
1619 | { | |
1620 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1621 | disable_work.work); | |
1622 | int count, i, ret; | |
1623 | ||
1624 | mutex_lock(&rdev->mutex); | |
1625 | ||
1626 | BUG_ON(!rdev->deferred_disables); | |
1627 | ||
1628 | count = rdev->deferred_disables; | |
1629 | rdev->deferred_disables = 0; | |
1630 | ||
1631 | for (i = 0; i < count; i++) { | |
1632 | ret = _regulator_disable(rdev); | |
1633 | if (ret != 0) | |
1634 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1635 | } | |
1636 | ||
1637 | mutex_unlock(&rdev->mutex); | |
1638 | ||
1639 | if (rdev->supply) { | |
1640 | for (i = 0; i < count; i++) { | |
1641 | ret = regulator_disable(rdev->supply); | |
1642 | if (ret != 0) { | |
1643 | rdev_err(rdev, | |
1644 | "Supply disable failed: %d\n", ret); | |
1645 | } | |
1646 | } | |
1647 | } | |
1648 | } | |
1649 | ||
1650 | /** | |
1651 | * regulator_disable_deferred - disable regulator output with delay | |
1652 | * @regulator: regulator source | |
1653 | * @ms: miliseconds until the regulator is disabled | |
1654 | * | |
1655 | * Execute regulator_disable() on the regulator after a delay. This | |
1656 | * is intended for use with devices that require some time to quiesce. | |
1657 | * | |
1658 | * NOTE: this will only disable the regulator output if no other consumer | |
1659 | * devices have it enabled, the regulator device supports disabling and | |
1660 | * machine constraints permit this operation. | |
1661 | */ | |
1662 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1663 | { | |
1664 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1665 | int ret; |
da07ecd9 MB |
1666 | |
1667 | mutex_lock(&rdev->mutex); | |
1668 | rdev->deferred_disables++; | |
1669 | mutex_unlock(&rdev->mutex); | |
1670 | ||
aa59802d MB |
1671 | ret = schedule_delayed_work(&rdev->disable_work, |
1672 | msecs_to_jiffies(ms)); | |
1673 | if (ret < 0) | |
1674 | return ret; | |
1675 | else | |
1676 | return 0; | |
da07ecd9 MB |
1677 | } |
1678 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1679 | ||
414c70cb LG |
1680 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1681 | { | |
9a7f6a4c | 1682 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1683 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1684 | return 1; |
414c70cb | 1685 | |
9332546f | 1686 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1687 | } |
1688 | ||
1689 | /** | |
1690 | * regulator_is_enabled - is the regulator output enabled | |
1691 | * @regulator: regulator source | |
1692 | * | |
412aec61 DB |
1693 | * Returns positive if the regulator driver backing the source/client |
1694 | * has requested that the device be enabled, zero if it hasn't, else a | |
1695 | * negative errno code. | |
1696 | * | |
1697 | * Note that the device backing this regulator handle can have multiple | |
1698 | * users, so it might be enabled even if regulator_enable() was never | |
1699 | * called for this particular source. | |
414c70cb LG |
1700 | */ |
1701 | int regulator_is_enabled(struct regulator *regulator) | |
1702 | { | |
9332546f MB |
1703 | int ret; |
1704 | ||
1705 | mutex_lock(®ulator->rdev->mutex); | |
1706 | ret = _regulator_is_enabled(regulator->rdev); | |
1707 | mutex_unlock(®ulator->rdev->mutex); | |
1708 | ||
1709 | return ret; | |
414c70cb LG |
1710 | } |
1711 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1712 | ||
4367cfdc DB |
1713 | /** |
1714 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1715 | * @regulator: regulator source | |
1716 | * | |
1717 | * Returns number of selectors, or negative errno. Selectors are | |
1718 | * numbered starting at zero, and typically correspond to bitfields | |
1719 | * in hardware registers. | |
1720 | */ | |
1721 | int regulator_count_voltages(struct regulator *regulator) | |
1722 | { | |
1723 | struct regulator_dev *rdev = regulator->rdev; | |
1724 | ||
1725 | return rdev->desc->n_voltages ? : -EINVAL; | |
1726 | } | |
1727 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1728 | ||
1729 | /** | |
1730 | * regulator_list_voltage - enumerate supported voltages | |
1731 | * @regulator: regulator source | |
1732 | * @selector: identify voltage to list | |
1733 | * Context: can sleep | |
1734 | * | |
1735 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1736 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1737 | * negative errno. |
1738 | */ | |
1739 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1740 | { | |
1741 | struct regulator_dev *rdev = regulator->rdev; | |
1742 | struct regulator_ops *ops = rdev->desc->ops; | |
1743 | int ret; | |
1744 | ||
1745 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1746 | return -EINVAL; | |
1747 | ||
1748 | mutex_lock(&rdev->mutex); | |
1749 | ret = ops->list_voltage(rdev, selector); | |
1750 | mutex_unlock(&rdev->mutex); | |
1751 | ||
1752 | if (ret > 0) { | |
1753 | if (ret < rdev->constraints->min_uV) | |
1754 | ret = 0; | |
1755 | else if (ret > rdev->constraints->max_uV) | |
1756 | ret = 0; | |
1757 | } | |
1758 | ||
1759 | return ret; | |
1760 | } | |
1761 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1762 | ||
a7a1ad90 MB |
1763 | /** |
1764 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1765 | * | |
1766 | * @regulator: Regulator to check. | |
1767 | * @min_uV: Minimum required voltage in uV. | |
1768 | * @max_uV: Maximum required voltage in uV. | |
1769 | * | |
1770 | * Returns a boolean or a negative error code. | |
1771 | */ | |
1772 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1773 | int min_uV, int max_uV) | |
1774 | { | |
1775 | int i, voltages, ret; | |
1776 | ||
1777 | ret = regulator_count_voltages(regulator); | |
1778 | if (ret < 0) | |
1779 | return ret; | |
1780 | voltages = ret; | |
1781 | ||
1782 | for (i = 0; i < voltages; i++) { | |
1783 | ret = regulator_list_voltage(regulator, i); | |
1784 | ||
1785 | if (ret >= min_uV && ret <= max_uV) | |
1786 | return 1; | |
1787 | } | |
1788 | ||
1789 | return 0; | |
1790 | } | |
a398eaa2 | 1791 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 1792 | |
75790251 MB |
1793 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
1794 | int min_uV, int max_uV) | |
1795 | { | |
1796 | int ret; | |
77af1b26 | 1797 | int delay = 0; |
75790251 MB |
1798 | unsigned int selector; |
1799 | ||
1800 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
1801 | ||
bf5892a8 MB |
1802 | min_uV += rdev->constraints->uV_offset; |
1803 | max_uV += rdev->constraints->uV_offset; | |
1804 | ||
75790251 MB |
1805 | if (rdev->desc->ops->set_voltage) { |
1806 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
1807 | &selector); | |
1808 | ||
1809 | if (rdev->desc->ops->list_voltage) | |
1810 | selector = rdev->desc->ops->list_voltage(rdev, | |
1811 | selector); | |
1812 | else | |
1813 | selector = -1; | |
e8eef82b MB |
1814 | } else if (rdev->desc->ops->set_voltage_sel) { |
1815 | int best_val = INT_MAX; | |
1816 | int i; | |
1817 | ||
1818 | selector = 0; | |
1819 | ||
1820 | /* Find the smallest voltage that falls within the specified | |
1821 | * range. | |
1822 | */ | |
1823 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1824 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
1825 | if (ret < 0) | |
1826 | continue; | |
1827 | ||
1828 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
1829 | best_val = ret; | |
1830 | selector = i; | |
1831 | } | |
1832 | } | |
1833 | ||
77af1b26 LW |
1834 | /* |
1835 | * If we can't obtain the old selector there is not enough | |
1836 | * info to call set_voltage_time_sel(). | |
1837 | */ | |
1838 | if (rdev->desc->ops->set_voltage_time_sel && | |
1839 | rdev->desc->ops->get_voltage_sel) { | |
1840 | unsigned int old_selector = 0; | |
1841 | ||
1842 | ret = rdev->desc->ops->get_voltage_sel(rdev); | |
1843 | if (ret < 0) | |
1844 | return ret; | |
1845 | old_selector = ret; | |
1846 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, | |
1847 | old_selector, selector); | |
1848 | } | |
1849 | ||
e8eef82b MB |
1850 | if (best_val != INT_MAX) { |
1851 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
1852 | selector = best_val; | |
1853 | } else { | |
1854 | ret = -EINVAL; | |
1855 | } | |
75790251 MB |
1856 | } else { |
1857 | ret = -EINVAL; | |
1858 | } | |
1859 | ||
77af1b26 LW |
1860 | /* Insert any necessary delays */ |
1861 | if (delay >= 1000) { | |
1862 | mdelay(delay / 1000); | |
1863 | udelay(delay % 1000); | |
1864 | } else if (delay) { | |
1865 | udelay(delay); | |
1866 | } | |
1867 | ||
ded06a52 MB |
1868 | if (ret == 0) |
1869 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
1870 | NULL); | |
1871 | ||
75790251 MB |
1872 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1873 | ||
1874 | return ret; | |
1875 | } | |
1876 | ||
414c70cb LG |
1877 | /** |
1878 | * regulator_set_voltage - set regulator output voltage | |
1879 | * @regulator: regulator source | |
1880 | * @min_uV: Minimum required voltage in uV | |
1881 | * @max_uV: Maximum acceptable voltage in uV | |
1882 | * | |
1883 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1884 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1885 | * | |
1886 | * If the regulator is enabled then the voltage will change to the new value | |
1887 | * immediately otherwise if the regulator is disabled the regulator will | |
1888 | * output at the new voltage when enabled. | |
1889 | * | |
1890 | * NOTE: If the regulator is shared between several devices then the lowest | |
1891 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1892 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1893 | * calling this function otherwise this call will fail. |
1894 | */ | |
1895 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1896 | { | |
1897 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 1898 | int ret = 0; |
414c70cb LG |
1899 | |
1900 | mutex_lock(&rdev->mutex); | |
1901 | ||
95a3c23a MB |
1902 | /* If we're setting the same range as last time the change |
1903 | * should be a noop (some cpufreq implementations use the same | |
1904 | * voltage for multiple frequencies, for example). | |
1905 | */ | |
1906 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
1907 | goto out; | |
1908 | ||
414c70cb | 1909 | /* sanity check */ |
e8eef82b MB |
1910 | if (!rdev->desc->ops->set_voltage && |
1911 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
1912 | ret = -EINVAL; |
1913 | goto out; | |
1914 | } | |
1915 | ||
1916 | /* constraints check */ | |
1917 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1918 | if (ret < 0) | |
1919 | goto out; | |
1920 | regulator->min_uV = min_uV; | |
1921 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1922 | |
05fda3b1 TP |
1923 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1924 | if (ret < 0) | |
1925 | goto out; | |
1926 | ||
75790251 | 1927 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 1928 | |
414c70cb LG |
1929 | out: |
1930 | mutex_unlock(&rdev->mutex); | |
1931 | return ret; | |
1932 | } | |
1933 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1934 | ||
88cd222b LW |
1935 | /** |
1936 | * regulator_set_voltage_time - get raise/fall time | |
1937 | * @regulator: regulator source | |
1938 | * @old_uV: starting voltage in microvolts | |
1939 | * @new_uV: target voltage in microvolts | |
1940 | * | |
1941 | * Provided with the starting and ending voltage, this function attempts to | |
1942 | * calculate the time in microseconds required to rise or fall to this new | |
1943 | * voltage. | |
1944 | */ | |
1945 | int regulator_set_voltage_time(struct regulator *regulator, | |
1946 | int old_uV, int new_uV) | |
1947 | { | |
1948 | struct regulator_dev *rdev = regulator->rdev; | |
1949 | struct regulator_ops *ops = rdev->desc->ops; | |
1950 | int old_sel = -1; | |
1951 | int new_sel = -1; | |
1952 | int voltage; | |
1953 | int i; | |
1954 | ||
1955 | /* Currently requires operations to do this */ | |
1956 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
1957 | || !rdev->desc->n_voltages) | |
1958 | return -EINVAL; | |
1959 | ||
1960 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1961 | /* We only look for exact voltage matches here */ | |
1962 | voltage = regulator_list_voltage(regulator, i); | |
1963 | if (voltage < 0) | |
1964 | return -EINVAL; | |
1965 | if (voltage == 0) | |
1966 | continue; | |
1967 | if (voltage == old_uV) | |
1968 | old_sel = i; | |
1969 | if (voltage == new_uV) | |
1970 | new_sel = i; | |
1971 | } | |
1972 | ||
1973 | if (old_sel < 0 || new_sel < 0) | |
1974 | return -EINVAL; | |
1975 | ||
1976 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
1977 | } | |
1978 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
1979 | ||
606a2562 MB |
1980 | /** |
1981 | * regulator_sync_voltage - re-apply last regulator output voltage | |
1982 | * @regulator: regulator source | |
1983 | * | |
1984 | * Re-apply the last configured voltage. This is intended to be used | |
1985 | * where some external control source the consumer is cooperating with | |
1986 | * has caused the configured voltage to change. | |
1987 | */ | |
1988 | int regulator_sync_voltage(struct regulator *regulator) | |
1989 | { | |
1990 | struct regulator_dev *rdev = regulator->rdev; | |
1991 | int ret, min_uV, max_uV; | |
1992 | ||
1993 | mutex_lock(&rdev->mutex); | |
1994 | ||
1995 | if (!rdev->desc->ops->set_voltage && | |
1996 | !rdev->desc->ops->set_voltage_sel) { | |
1997 | ret = -EINVAL; | |
1998 | goto out; | |
1999 | } | |
2000 | ||
2001 | /* This is only going to work if we've had a voltage configured. */ | |
2002 | if (!regulator->min_uV && !regulator->max_uV) { | |
2003 | ret = -EINVAL; | |
2004 | goto out; | |
2005 | } | |
2006 | ||
2007 | min_uV = regulator->min_uV; | |
2008 | max_uV = regulator->max_uV; | |
2009 | ||
2010 | /* This should be a paranoia check... */ | |
2011 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2012 | if (ret < 0) | |
2013 | goto out; | |
2014 | ||
2015 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2016 | if (ret < 0) | |
2017 | goto out; | |
2018 | ||
2019 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2020 | ||
2021 | out: | |
2022 | mutex_unlock(&rdev->mutex); | |
2023 | return ret; | |
2024 | } | |
2025 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2026 | ||
414c70cb LG |
2027 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2028 | { | |
bf5892a8 | 2029 | int sel, ret; |
476c2d83 MB |
2030 | |
2031 | if (rdev->desc->ops->get_voltage_sel) { | |
2032 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2033 | if (sel < 0) | |
2034 | return sel; | |
bf5892a8 | 2035 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2036 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2037 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 2038 | } else { |
414c70cb | 2039 | return -EINVAL; |
cb220d16 | 2040 | } |
bf5892a8 | 2041 | |
cb220d16 AL |
2042 | if (ret < 0) |
2043 | return ret; | |
bf5892a8 | 2044 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2045 | } |
2046 | ||
2047 | /** | |
2048 | * regulator_get_voltage - get regulator output voltage | |
2049 | * @regulator: regulator source | |
2050 | * | |
2051 | * This returns the current regulator voltage in uV. | |
2052 | * | |
2053 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2054 | * function should not be used to determine regulator state. | |
2055 | */ | |
2056 | int regulator_get_voltage(struct regulator *regulator) | |
2057 | { | |
2058 | int ret; | |
2059 | ||
2060 | mutex_lock(®ulator->rdev->mutex); | |
2061 | ||
2062 | ret = _regulator_get_voltage(regulator->rdev); | |
2063 | ||
2064 | mutex_unlock(®ulator->rdev->mutex); | |
2065 | ||
2066 | return ret; | |
2067 | } | |
2068 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2069 | ||
2070 | /** | |
2071 | * regulator_set_current_limit - set regulator output current limit | |
2072 | * @regulator: regulator source | |
2073 | * @min_uA: Minimuum supported current in uA | |
2074 | * @max_uA: Maximum supported current in uA | |
2075 | * | |
2076 | * Sets current sink to the desired output current. This can be set during | |
2077 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2078 | * | |
2079 | * If the regulator is enabled then the current will change to the new value | |
2080 | * immediately otherwise if the regulator is disabled the regulator will | |
2081 | * output at the new current when enabled. | |
2082 | * | |
2083 | * NOTE: Regulator system constraints must be set for this regulator before | |
2084 | * calling this function otherwise this call will fail. | |
2085 | */ | |
2086 | int regulator_set_current_limit(struct regulator *regulator, | |
2087 | int min_uA, int max_uA) | |
2088 | { | |
2089 | struct regulator_dev *rdev = regulator->rdev; | |
2090 | int ret; | |
2091 | ||
2092 | mutex_lock(&rdev->mutex); | |
2093 | ||
2094 | /* sanity check */ | |
2095 | if (!rdev->desc->ops->set_current_limit) { | |
2096 | ret = -EINVAL; | |
2097 | goto out; | |
2098 | } | |
2099 | ||
2100 | /* constraints check */ | |
2101 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2102 | if (ret < 0) | |
2103 | goto out; | |
2104 | ||
2105 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2106 | out: | |
2107 | mutex_unlock(&rdev->mutex); | |
2108 | return ret; | |
2109 | } | |
2110 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2111 | ||
2112 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2113 | { | |
2114 | int ret; | |
2115 | ||
2116 | mutex_lock(&rdev->mutex); | |
2117 | ||
2118 | /* sanity check */ | |
2119 | if (!rdev->desc->ops->get_current_limit) { | |
2120 | ret = -EINVAL; | |
2121 | goto out; | |
2122 | } | |
2123 | ||
2124 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2125 | out: | |
2126 | mutex_unlock(&rdev->mutex); | |
2127 | return ret; | |
2128 | } | |
2129 | ||
2130 | /** | |
2131 | * regulator_get_current_limit - get regulator output current | |
2132 | * @regulator: regulator source | |
2133 | * | |
2134 | * This returns the current supplied by the specified current sink in uA. | |
2135 | * | |
2136 | * NOTE: If the regulator is disabled it will return the current value. This | |
2137 | * function should not be used to determine regulator state. | |
2138 | */ | |
2139 | int regulator_get_current_limit(struct regulator *regulator) | |
2140 | { | |
2141 | return _regulator_get_current_limit(regulator->rdev); | |
2142 | } | |
2143 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2144 | ||
2145 | /** | |
2146 | * regulator_set_mode - set regulator operating mode | |
2147 | * @regulator: regulator source | |
2148 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2149 | * | |
2150 | * Set regulator operating mode to increase regulator efficiency or improve | |
2151 | * regulation performance. | |
2152 | * | |
2153 | * NOTE: Regulator system constraints must be set for this regulator before | |
2154 | * calling this function otherwise this call will fail. | |
2155 | */ | |
2156 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2157 | { | |
2158 | struct regulator_dev *rdev = regulator->rdev; | |
2159 | int ret; | |
500b4ac9 | 2160 | int regulator_curr_mode; |
414c70cb LG |
2161 | |
2162 | mutex_lock(&rdev->mutex); | |
2163 | ||
2164 | /* sanity check */ | |
2165 | if (!rdev->desc->ops->set_mode) { | |
2166 | ret = -EINVAL; | |
2167 | goto out; | |
2168 | } | |
2169 | ||
500b4ac9 SI |
2170 | /* return if the same mode is requested */ |
2171 | if (rdev->desc->ops->get_mode) { | |
2172 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2173 | if (regulator_curr_mode == mode) { | |
2174 | ret = 0; | |
2175 | goto out; | |
2176 | } | |
2177 | } | |
2178 | ||
414c70cb | 2179 | /* constraints check */ |
22c51b47 | 2180 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2181 | if (ret < 0) |
2182 | goto out; | |
2183 | ||
2184 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2185 | out: | |
2186 | mutex_unlock(&rdev->mutex); | |
2187 | return ret; | |
2188 | } | |
2189 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2190 | ||
2191 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2192 | { | |
2193 | int ret; | |
2194 | ||
2195 | mutex_lock(&rdev->mutex); | |
2196 | ||
2197 | /* sanity check */ | |
2198 | if (!rdev->desc->ops->get_mode) { | |
2199 | ret = -EINVAL; | |
2200 | goto out; | |
2201 | } | |
2202 | ||
2203 | ret = rdev->desc->ops->get_mode(rdev); | |
2204 | out: | |
2205 | mutex_unlock(&rdev->mutex); | |
2206 | return ret; | |
2207 | } | |
2208 | ||
2209 | /** | |
2210 | * regulator_get_mode - get regulator operating mode | |
2211 | * @regulator: regulator source | |
2212 | * | |
2213 | * Get the current regulator operating mode. | |
2214 | */ | |
2215 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2216 | { | |
2217 | return _regulator_get_mode(regulator->rdev); | |
2218 | } | |
2219 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2220 | ||
2221 | /** | |
2222 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2223 | * @regulator: regulator source | |
2224 | * @uA_load: load current | |
2225 | * | |
2226 | * Notifies the regulator core of a new device load. This is then used by | |
2227 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2228 | * operating mode for the new regulator loading. | |
2229 | * | |
2230 | * Consumer devices notify their supply regulator of the maximum power | |
2231 | * they will require (can be taken from device datasheet in the power | |
2232 | * consumption tables) when they change operational status and hence power | |
2233 | * state. Examples of operational state changes that can affect power | |
2234 | * consumption are :- | |
2235 | * | |
2236 | * o Device is opened / closed. | |
2237 | * o Device I/O is about to begin or has just finished. | |
2238 | * o Device is idling in between work. | |
2239 | * | |
2240 | * This information is also exported via sysfs to userspace. | |
2241 | * | |
2242 | * DRMS will sum the total requested load on the regulator and change | |
2243 | * to the most efficient operating mode if platform constraints allow. | |
2244 | * | |
2245 | * Returns the new regulator mode or error. | |
2246 | */ | |
2247 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2248 | { | |
2249 | struct regulator_dev *rdev = regulator->rdev; | |
2250 | struct regulator *consumer; | |
2251 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2252 | unsigned int mode; | |
2253 | ||
2254 | mutex_lock(&rdev->mutex); | |
2255 | ||
a4b41483 MB |
2256 | /* |
2257 | * first check to see if we can set modes at all, otherwise just | |
2258 | * tell the consumer everything is OK. | |
2259 | */ | |
414c70cb LG |
2260 | regulator->uA_load = uA_load; |
2261 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2262 | if (ret < 0) { |
2263 | ret = 0; | |
414c70cb | 2264 | goto out; |
a4b41483 | 2265 | } |
414c70cb | 2266 | |
414c70cb LG |
2267 | if (!rdev->desc->ops->get_optimum_mode) |
2268 | goto out; | |
2269 | ||
a4b41483 MB |
2270 | /* |
2271 | * we can actually do this so any errors are indicators of | |
2272 | * potential real failure. | |
2273 | */ | |
2274 | ret = -EINVAL; | |
2275 | ||
414c70cb | 2276 | /* get output voltage */ |
1bf5a1f8 | 2277 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2278 | if (output_uV <= 0) { |
5da84fd9 | 2279 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2280 | goto out; |
2281 | } | |
2282 | ||
2283 | /* get input voltage */ | |
1bf5a1f8 MB |
2284 | input_uV = 0; |
2285 | if (rdev->supply) | |
3801b86a | 2286 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 2287 | if (input_uV <= 0) |
414c70cb LG |
2288 | input_uV = rdev->constraints->input_uV; |
2289 | if (input_uV <= 0) { | |
5da84fd9 | 2290 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2291 | goto out; |
2292 | } | |
2293 | ||
2294 | /* calc total requested load for this regulator */ | |
2295 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2296 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2297 | |
2298 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2299 | input_uV, output_uV, | |
2300 | total_uA_load); | |
2c608234 | 2301 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2302 | if (ret < 0) { |
5da84fd9 JP |
2303 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2304 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2305 | goto out; |
2306 | } | |
2307 | ||
2308 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2309 | if (ret < 0) { |
5da84fd9 | 2310 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2311 | goto out; |
2312 | } | |
2313 | ret = mode; | |
2314 | out: | |
2315 | mutex_unlock(&rdev->mutex); | |
2316 | return ret; | |
2317 | } | |
2318 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2319 | ||
2320 | /** | |
2321 | * regulator_register_notifier - register regulator event notifier | |
2322 | * @regulator: regulator source | |
69279fb9 | 2323 | * @nb: notifier block |
414c70cb LG |
2324 | * |
2325 | * Register notifier block to receive regulator events. | |
2326 | */ | |
2327 | int regulator_register_notifier(struct regulator *regulator, | |
2328 | struct notifier_block *nb) | |
2329 | { | |
2330 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2331 | nb); | |
2332 | } | |
2333 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2334 | ||
2335 | /** | |
2336 | * regulator_unregister_notifier - unregister regulator event notifier | |
2337 | * @regulator: regulator source | |
69279fb9 | 2338 | * @nb: notifier block |
414c70cb LG |
2339 | * |
2340 | * Unregister regulator event notifier block. | |
2341 | */ | |
2342 | int regulator_unregister_notifier(struct regulator *regulator, | |
2343 | struct notifier_block *nb) | |
2344 | { | |
2345 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2346 | nb); | |
2347 | } | |
2348 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2349 | ||
b136fb44 JC |
2350 | /* notify regulator consumers and downstream regulator consumers. |
2351 | * Note mutex must be held by caller. | |
2352 | */ | |
414c70cb LG |
2353 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2354 | unsigned long event, void *data) | |
2355 | { | |
414c70cb | 2356 | /* call rdev chain first */ |
414c70cb | 2357 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2358 | } |
2359 | ||
2360 | /** | |
2361 | * regulator_bulk_get - get multiple regulator consumers | |
2362 | * | |
2363 | * @dev: Device to supply | |
2364 | * @num_consumers: Number of consumers to register | |
2365 | * @consumers: Configuration of consumers; clients are stored here. | |
2366 | * | |
2367 | * @return 0 on success, an errno on failure. | |
2368 | * | |
2369 | * This helper function allows drivers to get several regulator | |
2370 | * consumers in one operation. If any of the regulators cannot be | |
2371 | * acquired then any regulators that were allocated will be freed | |
2372 | * before returning to the caller. | |
2373 | */ | |
2374 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2375 | struct regulator_bulk_data *consumers) | |
2376 | { | |
2377 | int i; | |
2378 | int ret; | |
2379 | ||
2380 | for (i = 0; i < num_consumers; i++) | |
2381 | consumers[i].consumer = NULL; | |
2382 | ||
2383 | for (i = 0; i < num_consumers; i++) { | |
2384 | consumers[i].consumer = regulator_get(dev, | |
2385 | consumers[i].supply); | |
2386 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2387 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2388 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2389 | consumers[i].supply, ret); | |
414c70cb LG |
2390 | consumers[i].consumer = NULL; |
2391 | goto err; | |
2392 | } | |
2393 | } | |
2394 | ||
2395 | return 0; | |
2396 | ||
2397 | err: | |
2398 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2399 | regulator_put(consumers[i].consumer); | |
2400 | ||
2401 | return ret; | |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2404 | ||
f21e0e81 MB |
2405 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2406 | { | |
2407 | struct regulator_bulk_data *bulk = data; | |
2408 | ||
2409 | bulk->ret = regulator_enable(bulk->consumer); | |
2410 | } | |
2411 | ||
414c70cb LG |
2412 | /** |
2413 | * regulator_bulk_enable - enable multiple regulator consumers | |
2414 | * | |
2415 | * @num_consumers: Number of consumers | |
2416 | * @consumers: Consumer data; clients are stored here. | |
2417 | * @return 0 on success, an errno on failure | |
2418 | * | |
2419 | * This convenience API allows consumers to enable multiple regulator | |
2420 | * clients in a single API call. If any consumers cannot be enabled | |
2421 | * then any others that were enabled will be disabled again prior to | |
2422 | * return. | |
2423 | */ | |
2424 | int regulator_bulk_enable(int num_consumers, | |
2425 | struct regulator_bulk_data *consumers) | |
2426 | { | |
f21e0e81 | 2427 | LIST_HEAD(async_domain); |
414c70cb | 2428 | int i; |
f21e0e81 | 2429 | int ret = 0; |
414c70cb | 2430 | |
f21e0e81 MB |
2431 | for (i = 0; i < num_consumers; i++) |
2432 | async_schedule_domain(regulator_bulk_enable_async, | |
2433 | &consumers[i], &async_domain); | |
2434 | ||
2435 | async_synchronize_full_domain(&async_domain); | |
2436 | ||
2437 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2438 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2439 | if (consumers[i].ret != 0) { |
2440 | ret = consumers[i].ret; | |
414c70cb | 2441 | goto err; |
f21e0e81 | 2442 | } |
414c70cb LG |
2443 | } |
2444 | ||
2445 | return 0; | |
2446 | ||
2447 | err: | |
f21e0e81 MB |
2448 | for (i = 0; i < num_consumers; i++) |
2449 | if (consumers[i].ret == 0) | |
2450 | regulator_disable(consumers[i].consumer); | |
2451 | else | |
2452 | pr_err("Failed to enable %s: %d\n", | |
2453 | consumers[i].supply, consumers[i].ret); | |
414c70cb LG |
2454 | |
2455 | return ret; | |
2456 | } | |
2457 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2458 | ||
2459 | /** | |
2460 | * regulator_bulk_disable - disable multiple regulator consumers | |
2461 | * | |
2462 | * @num_consumers: Number of consumers | |
2463 | * @consumers: Consumer data; clients are stored here. | |
2464 | * @return 0 on success, an errno on failure | |
2465 | * | |
2466 | * This convenience API allows consumers to disable multiple regulator | |
2467 | * clients in a single API call. If any consumers cannot be enabled | |
2468 | * then any others that were disabled will be disabled again prior to | |
2469 | * return. | |
2470 | */ | |
2471 | int regulator_bulk_disable(int num_consumers, | |
2472 | struct regulator_bulk_data *consumers) | |
2473 | { | |
2474 | int i; | |
2475 | int ret; | |
2476 | ||
2477 | for (i = 0; i < num_consumers; i++) { | |
2478 | ret = regulator_disable(consumers[i].consumer); | |
2479 | if (ret != 0) | |
2480 | goto err; | |
2481 | } | |
2482 | ||
2483 | return 0; | |
2484 | ||
2485 | err: | |
5da84fd9 | 2486 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2487 | for (--i; i >= 0; --i) |
414c70cb LG |
2488 | regulator_enable(consumers[i].consumer); |
2489 | ||
2490 | return ret; | |
2491 | } | |
2492 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2493 | ||
2494 | /** | |
2495 | * regulator_bulk_free - free multiple regulator consumers | |
2496 | * | |
2497 | * @num_consumers: Number of consumers | |
2498 | * @consumers: Consumer data; clients are stored here. | |
2499 | * | |
2500 | * This convenience API allows consumers to free multiple regulator | |
2501 | * clients in a single API call. | |
2502 | */ | |
2503 | void regulator_bulk_free(int num_consumers, | |
2504 | struct regulator_bulk_data *consumers) | |
2505 | { | |
2506 | int i; | |
2507 | ||
2508 | for (i = 0; i < num_consumers; i++) { | |
2509 | regulator_put(consumers[i].consumer); | |
2510 | consumers[i].consumer = NULL; | |
2511 | } | |
2512 | } | |
2513 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2514 | ||
2515 | /** | |
2516 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2517 | * @rdev: regulator source |
414c70cb | 2518 | * @event: notifier block |
69279fb9 | 2519 | * @data: callback-specific data. |
414c70cb LG |
2520 | * |
2521 | * Called by regulator drivers to notify clients a regulator event has | |
2522 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2523 | * Note lock must be held by caller. |
414c70cb LG |
2524 | */ |
2525 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2526 | unsigned long event, void *data) | |
2527 | { | |
2528 | _notifier_call_chain(rdev, event, data); | |
2529 | return NOTIFY_DONE; | |
2530 | ||
2531 | } | |
2532 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2533 | ||
be721979 MB |
2534 | /** |
2535 | * regulator_mode_to_status - convert a regulator mode into a status | |
2536 | * | |
2537 | * @mode: Mode to convert | |
2538 | * | |
2539 | * Convert a regulator mode into a status. | |
2540 | */ | |
2541 | int regulator_mode_to_status(unsigned int mode) | |
2542 | { | |
2543 | switch (mode) { | |
2544 | case REGULATOR_MODE_FAST: | |
2545 | return REGULATOR_STATUS_FAST; | |
2546 | case REGULATOR_MODE_NORMAL: | |
2547 | return REGULATOR_STATUS_NORMAL; | |
2548 | case REGULATOR_MODE_IDLE: | |
2549 | return REGULATOR_STATUS_IDLE; | |
2550 | case REGULATOR_STATUS_STANDBY: | |
2551 | return REGULATOR_STATUS_STANDBY; | |
2552 | default: | |
2553 | return 0; | |
2554 | } | |
2555 | } | |
2556 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2557 | ||
7ad68e2f DB |
2558 | /* |
2559 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2560 | * create attributes that can be meaningfully displayed. | |
2561 | */ | |
2562 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2563 | { | |
2564 | struct device *dev = &rdev->dev; | |
2565 | struct regulator_ops *ops = rdev->desc->ops; | |
2566 | int status = 0; | |
2567 | ||
2568 | /* some attributes need specific methods to be displayed */ | |
4c78899b MB |
2569 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
2570 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { | |
7ad68e2f DB |
2571 | status = device_create_file(dev, &dev_attr_microvolts); |
2572 | if (status < 0) | |
2573 | return status; | |
2574 | } | |
2575 | if (ops->get_current_limit) { | |
2576 | status = device_create_file(dev, &dev_attr_microamps); | |
2577 | if (status < 0) | |
2578 | return status; | |
2579 | } | |
2580 | if (ops->get_mode) { | |
2581 | status = device_create_file(dev, &dev_attr_opmode); | |
2582 | if (status < 0) | |
2583 | return status; | |
2584 | } | |
2585 | if (ops->is_enabled) { | |
2586 | status = device_create_file(dev, &dev_attr_state); | |
2587 | if (status < 0) | |
2588 | return status; | |
2589 | } | |
853116a1 DB |
2590 | if (ops->get_status) { |
2591 | status = device_create_file(dev, &dev_attr_status); | |
2592 | if (status < 0) | |
2593 | return status; | |
2594 | } | |
7ad68e2f DB |
2595 | |
2596 | /* some attributes are type-specific */ | |
2597 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2598 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2599 | if (status < 0) | |
2600 | return status; | |
2601 | } | |
2602 | ||
2603 | /* all the other attributes exist to support constraints; | |
2604 | * don't show them if there are no constraints, or if the | |
2605 | * relevant supporting methods are missing. | |
2606 | */ | |
2607 | if (!rdev->constraints) | |
2608 | return status; | |
2609 | ||
2610 | /* constraints need specific supporting methods */ | |
e8eef82b | 2611 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2612 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2613 | if (status < 0) | |
2614 | return status; | |
2615 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2616 | if (status < 0) | |
2617 | return status; | |
2618 | } | |
2619 | if (ops->set_current_limit) { | |
2620 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2621 | if (status < 0) | |
2622 | return status; | |
2623 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2624 | if (status < 0) | |
2625 | return status; | |
2626 | } | |
2627 | ||
2628 | /* suspend mode constraints need multiple supporting methods */ | |
2629 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2630 | return status; | |
2631 | ||
2632 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2633 | if (status < 0) | |
2634 | return status; | |
2635 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2636 | if (status < 0) | |
2637 | return status; | |
2638 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2639 | if (status < 0) | |
2640 | return status; | |
2641 | ||
2642 | if (ops->set_suspend_voltage) { | |
2643 | status = device_create_file(dev, | |
2644 | &dev_attr_suspend_standby_microvolts); | |
2645 | if (status < 0) | |
2646 | return status; | |
2647 | status = device_create_file(dev, | |
2648 | &dev_attr_suspend_mem_microvolts); | |
2649 | if (status < 0) | |
2650 | return status; | |
2651 | status = device_create_file(dev, | |
2652 | &dev_attr_suspend_disk_microvolts); | |
2653 | if (status < 0) | |
2654 | return status; | |
2655 | } | |
2656 | ||
2657 | if (ops->set_suspend_mode) { | |
2658 | status = device_create_file(dev, | |
2659 | &dev_attr_suspend_standby_mode); | |
2660 | if (status < 0) | |
2661 | return status; | |
2662 | status = device_create_file(dev, | |
2663 | &dev_attr_suspend_mem_mode); | |
2664 | if (status < 0) | |
2665 | return status; | |
2666 | status = device_create_file(dev, | |
2667 | &dev_attr_suspend_disk_mode); | |
2668 | if (status < 0) | |
2669 | return status; | |
2670 | } | |
2671 | ||
2672 | return status; | |
2673 | } | |
2674 | ||
1130e5b3 MB |
2675 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
2676 | { | |
2677 | #ifdef CONFIG_DEBUG_FS | |
2678 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); | |
2679 | if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { | |
2680 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
2681 | rdev->debugfs = NULL; | |
2682 | return; | |
2683 | } | |
2684 | ||
2685 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
2686 | &rdev->use_count); | |
2687 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
2688 | &rdev->open_count); | |
2689 | #endif | |
2690 | } | |
2691 | ||
414c70cb LG |
2692 | /** |
2693 | * regulator_register - register regulator | |
69279fb9 MB |
2694 | * @regulator_desc: regulator to register |
2695 | * @dev: struct device for the regulator | |
0527100f | 2696 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2697 | * @driver_data: private regulator data |
414c70cb LG |
2698 | * |
2699 | * Called by regulator drivers to register a regulator. | |
2700 | * Returns 0 on success. | |
2701 | */ | |
2702 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2703 | struct device *dev, const struct regulator_init_data *init_data, |
2c043bcb | 2704 | void *driver_data, struct device_node *of_node) |
414c70cb | 2705 | { |
9a8f5e07 | 2706 | const struct regulation_constraints *constraints = NULL; |
414c70cb LG |
2707 | static atomic_t regulator_no = ATOMIC_INIT(0); |
2708 | struct regulator_dev *rdev; | |
a5766f11 | 2709 | int ret, i; |
69511a45 | 2710 | const char *supply = NULL; |
414c70cb LG |
2711 | |
2712 | if (regulator_desc == NULL) | |
2713 | return ERR_PTR(-EINVAL); | |
2714 | ||
2715 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2716 | return ERR_PTR(-EINVAL); | |
2717 | ||
cd78dfc6 DL |
2718 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2719 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2720 | return ERR_PTR(-EINVAL); |
2721 | ||
476c2d83 MB |
2722 | /* Only one of each should be implemented */ |
2723 | WARN_ON(regulator_desc->ops->get_voltage && | |
2724 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
2725 | WARN_ON(regulator_desc->ops->set_voltage && |
2726 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
2727 | |
2728 | /* If we're using selectors we must implement list_voltage. */ | |
2729 | if (regulator_desc->ops->get_voltage_sel && | |
2730 | !regulator_desc->ops->list_voltage) { | |
2731 | return ERR_PTR(-EINVAL); | |
2732 | } | |
e8eef82b MB |
2733 | if (regulator_desc->ops->set_voltage_sel && |
2734 | !regulator_desc->ops->list_voltage) { | |
2735 | return ERR_PTR(-EINVAL); | |
2736 | } | |
476c2d83 | 2737 | |
414c70cb LG |
2738 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2739 | if (rdev == NULL) | |
2740 | return ERR_PTR(-ENOMEM); | |
2741 | ||
2742 | mutex_lock(®ulator_list_mutex); | |
2743 | ||
2744 | mutex_init(&rdev->mutex); | |
a5766f11 | 2745 | rdev->reg_data = driver_data; |
414c70cb LG |
2746 | rdev->owner = regulator_desc->owner; |
2747 | rdev->desc = regulator_desc; | |
2748 | INIT_LIST_HEAD(&rdev->consumer_list); | |
414c70cb | 2749 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 2750 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 2751 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 2752 | |
a5766f11 | 2753 | /* preform any regulator specific init */ |
9a8f5e07 | 2754 | if (init_data && init_data->regulator_init) { |
a5766f11 | 2755 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
2756 | if (ret < 0) |
2757 | goto clean; | |
a5766f11 LG |
2758 | } |
2759 | ||
a5766f11 | 2760 | /* register with sysfs */ |
414c70cb | 2761 | rdev->dev.class = ®ulator_class; |
2c043bcb | 2762 | rdev->dev.of_node = of_node; |
a5766f11 | 2763 | rdev->dev.parent = dev; |
812460a9 KS |
2764 | dev_set_name(&rdev->dev, "regulator.%d", |
2765 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2766 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2767 | if (ret != 0) { |
2768 | put_device(&rdev->dev); | |
4fca9545 | 2769 | goto clean; |
ad7725cb | 2770 | } |
a5766f11 LG |
2771 | |
2772 | dev_set_drvdata(&rdev->dev, rdev); | |
2773 | ||
74f544c1 | 2774 | /* set regulator constraints */ |
9a8f5e07 MB |
2775 | if (init_data) |
2776 | constraints = &init_data->constraints; | |
2777 | ||
2778 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
2779 | if (ret < 0) |
2780 | goto scrub; | |
2781 | ||
7ad68e2f DB |
2782 | /* add attributes supported by this regulator */ |
2783 | ret = add_regulator_attributes(rdev); | |
2784 | if (ret < 0) | |
2785 | goto scrub; | |
2786 | ||
9a8f5e07 | 2787 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
2788 | supply = init_data->supply_regulator; |
2789 | else if (regulator_desc->supply_name) | |
2790 | supply = regulator_desc->supply_name; | |
2791 | ||
2792 | if (supply) { | |
0178f3e2 | 2793 | struct regulator_dev *r; |
0178f3e2 | 2794 | |
69511a45 | 2795 | r = regulator_dev_lookup(dev, supply); |
0178f3e2 | 2796 | |
69511a45 RN |
2797 | if (!r) { |
2798 | dev_err(dev, "Failed to find supply %s\n", supply); | |
7727da22 | 2799 | ret = -ENODEV; |
0178f3e2 MB |
2800 | goto scrub; |
2801 | } | |
2802 | ||
2803 | ret = set_supply(rdev, r); | |
2804 | if (ret < 0) | |
2805 | goto scrub; | |
2806 | } | |
2807 | ||
a5766f11 | 2808 | /* add consumers devices */ |
9a8f5e07 MB |
2809 | if (init_data) { |
2810 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2811 | ret = set_consumer_device_supply(rdev, | |
2812 | init_data->consumer_supplies[i].dev, | |
2813 | init_data->consumer_supplies[i].dev_name, | |
23c2f041 | 2814 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
2815 | if (ret < 0) { |
2816 | dev_err(dev, "Failed to set supply %s\n", | |
2817 | init_data->consumer_supplies[i].supply); | |
2818 | goto unset_supplies; | |
2819 | } | |
23c2f041 | 2820 | } |
414c70cb | 2821 | } |
a5766f11 LG |
2822 | |
2823 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
2824 | |
2825 | rdev_init_debugfs(rdev); | |
a5766f11 | 2826 | out: |
414c70cb LG |
2827 | mutex_unlock(®ulator_list_mutex); |
2828 | return rdev; | |
4fca9545 | 2829 | |
d4033b54 JN |
2830 | unset_supplies: |
2831 | unset_regulator_supplies(rdev); | |
2832 | ||
4fca9545 | 2833 | scrub: |
1a6958e7 | 2834 | kfree(rdev->constraints); |
4fca9545 | 2835 | device_unregister(&rdev->dev); |
53032daf PW |
2836 | /* device core frees rdev */ |
2837 | rdev = ERR_PTR(ret); | |
2838 | goto out; | |
2839 | ||
4fca9545 DB |
2840 | clean: |
2841 | kfree(rdev); | |
2842 | rdev = ERR_PTR(ret); | |
2843 | goto out; | |
414c70cb LG |
2844 | } |
2845 | EXPORT_SYMBOL_GPL(regulator_register); | |
2846 | ||
2847 | /** | |
2848 | * regulator_unregister - unregister regulator | |
69279fb9 | 2849 | * @rdev: regulator to unregister |
414c70cb LG |
2850 | * |
2851 | * Called by regulator drivers to unregister a regulator. | |
2852 | */ | |
2853 | void regulator_unregister(struct regulator_dev *rdev) | |
2854 | { | |
2855 | if (rdev == NULL) | |
2856 | return; | |
2857 | ||
2858 | mutex_lock(®ulator_list_mutex); | |
1130e5b3 MB |
2859 | #ifdef CONFIG_DEBUG_FS |
2860 | debugfs_remove_recursive(rdev->debugfs); | |
2861 | #endif | |
da07ecd9 | 2862 | flush_work_sync(&rdev->disable_work.work); |
6bf87d17 | 2863 | WARN_ON(rdev->open_count); |
0f1d747b | 2864 | unset_regulator_supplies(rdev); |
414c70cb LG |
2865 | list_del(&rdev->list); |
2866 | if (rdev->supply) | |
3801b86a | 2867 | regulator_put(rdev->supply); |
f8c12fe3 | 2868 | kfree(rdev->constraints); |
58fb5cf5 | 2869 | device_unregister(&rdev->dev); |
414c70cb LG |
2870 | mutex_unlock(®ulator_list_mutex); |
2871 | } | |
2872 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2873 | ||
414c70cb | 2874 | /** |
cf7bbcdf | 2875 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2876 | * @state: system suspend state |
2877 | * | |
2878 | * Configure each regulator with it's suspend operating parameters for state. | |
2879 | * This will usually be called by machine suspend code prior to supending. | |
2880 | */ | |
2881 | int regulator_suspend_prepare(suspend_state_t state) | |
2882 | { | |
2883 | struct regulator_dev *rdev; | |
2884 | int ret = 0; | |
2885 | ||
2886 | /* ON is handled by regulator active state */ | |
2887 | if (state == PM_SUSPEND_ON) | |
2888 | return -EINVAL; | |
2889 | ||
2890 | mutex_lock(®ulator_list_mutex); | |
2891 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2892 | ||
2893 | mutex_lock(&rdev->mutex); | |
2894 | ret = suspend_prepare(rdev, state); | |
2895 | mutex_unlock(&rdev->mutex); | |
2896 | ||
2897 | if (ret < 0) { | |
5da84fd9 | 2898 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2899 | goto out; |
2900 | } | |
2901 | } | |
2902 | out: | |
2903 | mutex_unlock(®ulator_list_mutex); | |
2904 | return ret; | |
2905 | } | |
2906 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2907 | ||
7a32b589 MH |
2908 | /** |
2909 | * regulator_suspend_finish - resume regulators from system wide suspend | |
2910 | * | |
2911 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
2912 | * and that should be turned on according to the regulators properties. | |
2913 | */ | |
2914 | int regulator_suspend_finish(void) | |
2915 | { | |
2916 | struct regulator_dev *rdev; | |
2917 | int ret = 0, error; | |
2918 | ||
2919 | mutex_lock(®ulator_list_mutex); | |
2920 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2921 | struct regulator_ops *ops = rdev->desc->ops; | |
2922 | ||
2923 | mutex_lock(&rdev->mutex); | |
2924 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
2925 | ops->enable) { | |
2926 | error = ops->enable(rdev); | |
2927 | if (error) | |
2928 | ret = error; | |
2929 | } else { | |
2930 | if (!has_full_constraints) | |
2931 | goto unlock; | |
2932 | if (!ops->disable) | |
2933 | goto unlock; | |
2934 | if (ops->is_enabled && !ops->is_enabled(rdev)) | |
2935 | goto unlock; | |
2936 | ||
2937 | error = ops->disable(rdev); | |
2938 | if (error) | |
2939 | ret = error; | |
2940 | } | |
2941 | unlock: | |
2942 | mutex_unlock(&rdev->mutex); | |
2943 | } | |
2944 | mutex_unlock(®ulator_list_mutex); | |
2945 | return ret; | |
2946 | } | |
2947 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
2948 | ||
ca725561 MB |
2949 | /** |
2950 | * regulator_has_full_constraints - the system has fully specified constraints | |
2951 | * | |
2952 | * Calling this function will cause the regulator API to disable all | |
2953 | * regulators which have a zero use count and don't have an always_on | |
2954 | * constraint in a late_initcall. | |
2955 | * | |
2956 | * The intention is that this will become the default behaviour in a | |
2957 | * future kernel release so users are encouraged to use this facility | |
2958 | * now. | |
2959 | */ | |
2960 | void regulator_has_full_constraints(void) | |
2961 | { | |
2962 | has_full_constraints = 1; | |
2963 | } | |
2964 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2965 | ||
688fe99a MB |
2966 | /** |
2967 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2968 | * | |
2969 | * Calling this function will cause the regulator API to provide a | |
2970 | * dummy regulator to consumers if no physical regulator is found, | |
2971 | * allowing most consumers to proceed as though a regulator were | |
2972 | * configured. This allows systems such as those with software | |
2973 | * controllable regulators for the CPU core only to be brought up more | |
2974 | * readily. | |
2975 | */ | |
2976 | void regulator_use_dummy_regulator(void) | |
2977 | { | |
2978 | board_wants_dummy_regulator = true; | |
2979 | } | |
2980 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2981 | ||
414c70cb LG |
2982 | /** |
2983 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2984 | * @rdev: regulator |
414c70cb LG |
2985 | * |
2986 | * Get rdev regulator driver private data. This call can be used in the | |
2987 | * regulator driver context. | |
2988 | */ | |
2989 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2990 | { | |
2991 | return rdev->reg_data; | |
2992 | } | |
2993 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2994 | ||
2995 | /** | |
2996 | * regulator_get_drvdata - get regulator driver data | |
2997 | * @regulator: regulator | |
2998 | * | |
2999 | * Get regulator driver private data. This call can be used in the consumer | |
3000 | * driver context when non API regulator specific functions need to be called. | |
3001 | */ | |
3002 | void *regulator_get_drvdata(struct regulator *regulator) | |
3003 | { | |
3004 | return regulator->rdev->reg_data; | |
3005 | } | |
3006 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3007 | ||
3008 | /** | |
3009 | * regulator_set_drvdata - set regulator driver data | |
3010 | * @regulator: regulator | |
3011 | * @data: data | |
3012 | */ | |
3013 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3014 | { | |
3015 | regulator->rdev->reg_data = data; | |
3016 | } | |
3017 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3018 | ||
3019 | /** | |
3020 | * regulator_get_id - get regulator ID | |
69279fb9 | 3021 | * @rdev: regulator |
414c70cb LG |
3022 | */ |
3023 | int rdev_get_id(struct regulator_dev *rdev) | |
3024 | { | |
3025 | return rdev->desc->id; | |
3026 | } | |
3027 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3028 | ||
a5766f11 LG |
3029 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3030 | { | |
3031 | return &rdev->dev; | |
3032 | } | |
3033 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3034 | ||
3035 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3036 | { | |
3037 | return reg_init_data->driver_data; | |
3038 | } | |
3039 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3040 | ||
ba55a974 MB |
3041 | #ifdef CONFIG_DEBUG_FS |
3042 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3043 | size_t count, loff_t *ppos) | |
3044 | { | |
3045 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3046 | ssize_t len, ret = 0; | |
3047 | struct regulator_map *map; | |
3048 | ||
3049 | if (!buf) | |
3050 | return -ENOMEM; | |
3051 | ||
3052 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3053 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3054 | "%s -> %s.%s\n", | |
3055 | rdev_get_name(map->regulator), map->dev_name, | |
3056 | map->supply); | |
3057 | if (len >= 0) | |
3058 | ret += len; | |
3059 | if (ret > PAGE_SIZE) { | |
3060 | ret = PAGE_SIZE; | |
3061 | break; | |
3062 | } | |
3063 | } | |
3064 | ||
3065 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3066 | ||
3067 | kfree(buf); | |
3068 | ||
3069 | return ret; | |
3070 | } | |
3071 | ||
3072 | static const struct file_operations supply_map_fops = { | |
3073 | .read = supply_map_read_file, | |
3074 | .llseek = default_llseek, | |
3075 | }; | |
3076 | #endif | |
3077 | ||
414c70cb LG |
3078 | static int __init regulator_init(void) |
3079 | { | |
34abbd68 MB |
3080 | int ret; |
3081 | ||
34abbd68 MB |
3082 | ret = class_register(®ulator_class); |
3083 | ||
1130e5b3 MB |
3084 | #ifdef CONFIG_DEBUG_FS |
3085 | debugfs_root = debugfs_create_dir("regulator", NULL); | |
3086 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
3087 | pr_warn("regulator: Failed to create debugfs directory\n"); | |
3088 | debugfs_root = NULL; | |
3089 | } | |
ba55a974 MB |
3090 | |
3091 | if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, | |
3092 | NULL, &supply_map_fops))) | |
3093 | pr_warn("regulator: Failed to create supplies debugfs\n"); | |
1130e5b3 MB |
3094 | #endif |
3095 | ||
34abbd68 MB |
3096 | regulator_dummy_init(); |
3097 | ||
3098 | return ret; | |
414c70cb LG |
3099 | } |
3100 | ||
3101 | /* init early to allow our consumers to complete system booting */ | |
3102 | core_initcall(regulator_init); | |
ca725561 MB |
3103 | |
3104 | static int __init regulator_init_complete(void) | |
3105 | { | |
3106 | struct regulator_dev *rdev; | |
3107 | struct regulator_ops *ops; | |
3108 | struct regulation_constraints *c; | |
3109 | int enabled, ret; | |
ca725561 MB |
3110 | |
3111 | mutex_lock(®ulator_list_mutex); | |
3112 | ||
3113 | /* If we have a full configuration then disable any regulators | |
3114 | * which are not in use or always_on. This will become the | |
3115 | * default behaviour in the future. | |
3116 | */ | |
3117 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3118 | ops = rdev->desc->ops; | |
3119 | c = rdev->constraints; | |
3120 | ||
f25e0b4f | 3121 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3122 | continue; |
3123 | ||
3124 | mutex_lock(&rdev->mutex); | |
3125 | ||
3126 | if (rdev->use_count) | |
3127 | goto unlock; | |
3128 | ||
3129 | /* If we can't read the status assume it's on. */ | |
3130 | if (ops->is_enabled) | |
3131 | enabled = ops->is_enabled(rdev); | |
3132 | else | |
3133 | enabled = 1; | |
3134 | ||
3135 | if (!enabled) | |
3136 | goto unlock; | |
3137 | ||
3138 | if (has_full_constraints) { | |
3139 | /* We log since this may kill the system if it | |
3140 | * goes wrong. */ | |
5da84fd9 | 3141 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3142 | ret = ops->disable(rdev); |
3143 | if (ret != 0) { | |
5da84fd9 | 3144 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3145 | } |
3146 | } else { | |
3147 | /* The intention is that in future we will | |
3148 | * assume that full constraints are provided | |
3149 | * so warn even if we aren't going to do | |
3150 | * anything here. | |
3151 | */ | |
5da84fd9 | 3152 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3153 | } |
3154 | ||
3155 | unlock: | |
3156 | mutex_unlock(&rdev->mutex); | |
3157 | } | |
3158 | ||
3159 | mutex_unlock(®ulator_list_mutex); | |
3160 | ||
3161 | return 0; | |
3162 | } | |
3163 | late_initcall(regulator_init_complete); |