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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> | |
20 | #include <linux/device.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
414c70cb LG |
26 | #include <linux/regulator/consumer.h> |
27 | #include <linux/regulator/driver.h> | |
28 | #include <linux/regulator/machine.h> | |
29 | ||
02fa3ec0 MB |
30 | #define CREATE_TRACE_POINTS |
31 | #include <trace/events/regulator.h> | |
32 | ||
34abbd68 MB |
33 | #include "dummy.h" |
34 | ||
5da84fd9 JP |
35 | #define rdev_err(rdev, fmt, ...) \ |
36 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
37 | #define rdev_warn(rdev, fmt, ...) \ | |
38 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
39 | #define rdev_info(rdev, fmt, ...) \ | |
40 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
41 | #define rdev_dbg(rdev, fmt, ...) \ | |
42 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | ||
414c70cb LG |
44 | static DEFINE_MUTEX(regulator_list_mutex); |
45 | static LIST_HEAD(regulator_list); | |
46 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 47 | static int has_full_constraints; |
688fe99a | 48 | static bool board_wants_dummy_regulator; |
414c70cb | 49 | |
8dc5390d | 50 | /* |
414c70cb LG |
51 | * struct regulator_map |
52 | * | |
53 | * Used to provide symbolic supply names to devices. | |
54 | */ | |
55 | struct regulator_map { | |
56 | struct list_head list; | |
40f9244f | 57 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 58 | const char *supply; |
a5766f11 | 59 | struct regulator_dev *regulator; |
414c70cb LG |
60 | }; |
61 | ||
414c70cb LG |
62 | /* |
63 | * struct regulator | |
64 | * | |
65 | * One for each consumer device. | |
66 | */ | |
67 | struct regulator { | |
68 | struct device *dev; | |
69 | struct list_head list; | |
70 | int uA_load; | |
71 | int min_uV; | |
72 | int max_uV; | |
414c70cb LG |
73 | char *supply_name; |
74 | struct device_attribute dev_attr; | |
75 | struct regulator_dev *rdev; | |
76 | }; | |
77 | ||
78 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
8cbf811d JC |
79 | static int _regulator_disable(struct regulator_dev *rdev, |
80 | struct regulator_dev **supply_rdev_ptr); | |
414c70cb LG |
81 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
82 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
83 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
84 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
85 | unsigned long event, void *data); | |
86 | ||
1083c393 MB |
87 | static const char *rdev_get_name(struct regulator_dev *rdev) |
88 | { | |
89 | if (rdev->constraints && rdev->constraints->name) | |
90 | return rdev->constraints->name; | |
91 | else if (rdev->desc->name) | |
92 | return rdev->desc->name; | |
93 | else | |
94 | return ""; | |
95 | } | |
96 | ||
414c70cb LG |
97 | /* gets the regulator for a given consumer device */ |
98 | static struct regulator *get_device_regulator(struct device *dev) | |
99 | { | |
100 | struct regulator *regulator = NULL; | |
101 | struct regulator_dev *rdev; | |
102 | ||
103 | mutex_lock(®ulator_list_mutex); | |
104 | list_for_each_entry(rdev, ®ulator_list, list) { | |
105 | mutex_lock(&rdev->mutex); | |
106 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
107 | if (regulator->dev == dev) { | |
108 | mutex_unlock(&rdev->mutex); | |
109 | mutex_unlock(®ulator_list_mutex); | |
110 | return regulator; | |
111 | } | |
112 | } | |
113 | mutex_unlock(&rdev->mutex); | |
114 | } | |
115 | mutex_unlock(®ulator_list_mutex); | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | /* Platform voltage constraint check */ | |
120 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
121 | int *min_uV, int *max_uV) | |
122 | { | |
123 | BUG_ON(*min_uV > *max_uV); | |
124 | ||
125 | if (!rdev->constraints) { | |
5da84fd9 | 126 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
127 | return -ENODEV; |
128 | } | |
129 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 130 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
131 | return -EPERM; |
132 | } | |
133 | ||
134 | if (*max_uV > rdev->constraints->max_uV) | |
135 | *max_uV = rdev->constraints->max_uV; | |
136 | if (*min_uV < rdev->constraints->min_uV) | |
137 | *min_uV = rdev->constraints->min_uV; | |
138 | ||
139 | if (*min_uV > *max_uV) | |
140 | return -EINVAL; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
05fda3b1 TP |
145 | /* Make sure we select a voltage that suits the needs of all |
146 | * regulator consumers | |
147 | */ | |
148 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
149 | int *min_uV, int *max_uV) | |
150 | { | |
151 | struct regulator *regulator; | |
152 | ||
153 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
154 | if (*max_uV > regulator->max_uV) | |
155 | *max_uV = regulator->max_uV; | |
156 | if (*min_uV < regulator->min_uV) | |
157 | *min_uV = regulator->min_uV; | |
158 | } | |
159 | ||
160 | if (*min_uV > *max_uV) | |
161 | return -EINVAL; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
414c70cb LG |
166 | /* current constraint check */ |
167 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
168 | int *min_uA, int *max_uA) | |
169 | { | |
170 | BUG_ON(*min_uA > *max_uA); | |
171 | ||
172 | if (!rdev->constraints) { | |
5da84fd9 | 173 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
174 | return -ENODEV; |
175 | } | |
176 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 177 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
178 | return -EPERM; |
179 | } | |
180 | ||
181 | if (*max_uA > rdev->constraints->max_uA) | |
182 | *max_uA = rdev->constraints->max_uA; | |
183 | if (*min_uA < rdev->constraints->min_uA) | |
184 | *min_uA = rdev->constraints->min_uA; | |
185 | ||
186 | if (*min_uA > *max_uA) | |
187 | return -EINVAL; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | /* operating mode constraint check */ | |
193 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
194 | { | |
e573520b DB |
195 | switch (mode) { |
196 | case REGULATOR_MODE_FAST: | |
197 | case REGULATOR_MODE_NORMAL: | |
198 | case REGULATOR_MODE_IDLE: | |
199 | case REGULATOR_MODE_STANDBY: | |
200 | break; | |
201 | default: | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
414c70cb | 205 | if (!rdev->constraints) { |
5da84fd9 | 206 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
207 | return -ENODEV; |
208 | } | |
209 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 210 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
211 | return -EPERM; |
212 | } | |
213 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
5da84fd9 | 214 | rdev_err(rdev, "invalid mode %x\n", mode); |
414c70cb LG |
215 | return -EINVAL; |
216 | } | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* dynamic regulator mode switching constraint check */ | |
221 | static int regulator_check_drms(struct regulator_dev *rdev) | |
222 | { | |
223 | if (!rdev->constraints) { | |
5da84fd9 | 224 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
225 | return -ENODEV; |
226 | } | |
227 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 228 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
229 | return -EPERM; |
230 | } | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static ssize_t device_requested_uA_show(struct device *dev, | |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
237 | struct regulator *regulator; | |
238 | ||
239 | regulator = get_device_regulator(dev); | |
240 | if (regulator == NULL) | |
241 | return 0; | |
242 | ||
243 | return sprintf(buf, "%d\n", regulator->uA_load); | |
244 | } | |
245 | ||
246 | static ssize_t regulator_uV_show(struct device *dev, | |
247 | struct device_attribute *attr, char *buf) | |
248 | { | |
a5766f11 | 249 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
250 | ssize_t ret; |
251 | ||
252 | mutex_lock(&rdev->mutex); | |
253 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
254 | mutex_unlock(&rdev->mutex); | |
255 | ||
256 | return ret; | |
257 | } | |
7ad68e2f | 258 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
259 | |
260 | static ssize_t regulator_uA_show(struct device *dev, | |
261 | struct device_attribute *attr, char *buf) | |
262 | { | |
a5766f11 | 263 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
264 | |
265 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
266 | } | |
7ad68e2f | 267 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 268 | |
bc558a60 MB |
269 | static ssize_t regulator_name_show(struct device *dev, |
270 | struct device_attribute *attr, char *buf) | |
271 | { | |
272 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 273 | |
1083c393 | 274 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
275 | } |
276 | ||
4fca9545 | 277 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 278 | { |
414c70cb LG |
279 | switch (mode) { |
280 | case REGULATOR_MODE_FAST: | |
281 | return sprintf(buf, "fast\n"); | |
282 | case REGULATOR_MODE_NORMAL: | |
283 | return sprintf(buf, "normal\n"); | |
284 | case REGULATOR_MODE_IDLE: | |
285 | return sprintf(buf, "idle\n"); | |
286 | case REGULATOR_MODE_STANDBY: | |
287 | return sprintf(buf, "standby\n"); | |
288 | } | |
289 | return sprintf(buf, "unknown\n"); | |
290 | } | |
291 | ||
4fca9545 DB |
292 | static ssize_t regulator_opmode_show(struct device *dev, |
293 | struct device_attribute *attr, char *buf) | |
414c70cb | 294 | { |
a5766f11 | 295 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 296 | |
4fca9545 DB |
297 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
298 | } | |
7ad68e2f | 299 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
300 | |
301 | static ssize_t regulator_print_state(char *buf, int state) | |
302 | { | |
414c70cb LG |
303 | if (state > 0) |
304 | return sprintf(buf, "enabled\n"); | |
305 | else if (state == 0) | |
306 | return sprintf(buf, "disabled\n"); | |
307 | else | |
308 | return sprintf(buf, "unknown\n"); | |
309 | } | |
310 | ||
4fca9545 DB |
311 | static ssize_t regulator_state_show(struct device *dev, |
312 | struct device_attribute *attr, char *buf) | |
313 | { | |
314 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
315 | ssize_t ret; |
316 | ||
317 | mutex_lock(&rdev->mutex); | |
318 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
319 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 320 | |
9332546f | 321 | return ret; |
4fca9545 | 322 | } |
7ad68e2f | 323 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 324 | |
853116a1 DB |
325 | static ssize_t regulator_status_show(struct device *dev, |
326 | struct device_attribute *attr, char *buf) | |
327 | { | |
328 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
329 | int status; | |
330 | char *label; | |
331 | ||
332 | status = rdev->desc->ops->get_status(rdev); | |
333 | if (status < 0) | |
334 | return status; | |
335 | ||
336 | switch (status) { | |
337 | case REGULATOR_STATUS_OFF: | |
338 | label = "off"; | |
339 | break; | |
340 | case REGULATOR_STATUS_ON: | |
341 | label = "on"; | |
342 | break; | |
343 | case REGULATOR_STATUS_ERROR: | |
344 | label = "error"; | |
345 | break; | |
346 | case REGULATOR_STATUS_FAST: | |
347 | label = "fast"; | |
348 | break; | |
349 | case REGULATOR_STATUS_NORMAL: | |
350 | label = "normal"; | |
351 | break; | |
352 | case REGULATOR_STATUS_IDLE: | |
353 | label = "idle"; | |
354 | break; | |
355 | case REGULATOR_STATUS_STANDBY: | |
356 | label = "standby"; | |
357 | break; | |
358 | default: | |
359 | return -ERANGE; | |
360 | } | |
361 | ||
362 | return sprintf(buf, "%s\n", label); | |
363 | } | |
364 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
365 | ||
414c70cb LG |
366 | static ssize_t regulator_min_uA_show(struct device *dev, |
367 | struct device_attribute *attr, char *buf) | |
368 | { | |
a5766f11 | 369 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
370 | |
371 | if (!rdev->constraints) | |
372 | return sprintf(buf, "constraint not defined\n"); | |
373 | ||
374 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
375 | } | |
7ad68e2f | 376 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
377 | |
378 | static ssize_t regulator_max_uA_show(struct device *dev, | |
379 | struct device_attribute *attr, char *buf) | |
380 | { | |
a5766f11 | 381 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
382 | |
383 | if (!rdev->constraints) | |
384 | return sprintf(buf, "constraint not defined\n"); | |
385 | ||
386 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
387 | } | |
7ad68e2f | 388 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
389 | |
390 | static ssize_t regulator_min_uV_show(struct device *dev, | |
391 | struct device_attribute *attr, char *buf) | |
392 | { | |
a5766f11 | 393 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
394 | |
395 | if (!rdev->constraints) | |
396 | return sprintf(buf, "constraint not defined\n"); | |
397 | ||
398 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
399 | } | |
7ad68e2f | 400 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
401 | |
402 | static ssize_t regulator_max_uV_show(struct device *dev, | |
403 | struct device_attribute *attr, char *buf) | |
404 | { | |
a5766f11 | 405 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
406 | |
407 | if (!rdev->constraints) | |
408 | return sprintf(buf, "constraint not defined\n"); | |
409 | ||
410 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
411 | } | |
7ad68e2f | 412 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
413 | |
414 | static ssize_t regulator_total_uA_show(struct device *dev, | |
415 | struct device_attribute *attr, char *buf) | |
416 | { | |
a5766f11 | 417 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
418 | struct regulator *regulator; |
419 | int uA = 0; | |
420 | ||
421 | mutex_lock(&rdev->mutex); | |
422 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 423 | uA += regulator->uA_load; |
414c70cb LG |
424 | mutex_unlock(&rdev->mutex); |
425 | return sprintf(buf, "%d\n", uA); | |
426 | } | |
7ad68e2f | 427 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
428 | |
429 | static ssize_t regulator_num_users_show(struct device *dev, | |
430 | struct device_attribute *attr, char *buf) | |
431 | { | |
a5766f11 | 432 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
433 | return sprintf(buf, "%d\n", rdev->use_count); |
434 | } | |
435 | ||
436 | static ssize_t regulator_type_show(struct device *dev, | |
437 | struct device_attribute *attr, char *buf) | |
438 | { | |
a5766f11 | 439 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
440 | |
441 | switch (rdev->desc->type) { | |
442 | case REGULATOR_VOLTAGE: | |
443 | return sprintf(buf, "voltage\n"); | |
444 | case REGULATOR_CURRENT: | |
445 | return sprintf(buf, "current\n"); | |
446 | } | |
447 | return sprintf(buf, "unknown\n"); | |
448 | } | |
449 | ||
450 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 454 | |
414c70cb LG |
455 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
456 | } | |
7ad68e2f DB |
457 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
458 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
459 | |
460 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
461 | struct device_attribute *attr, char *buf) | |
462 | { | |
a5766f11 | 463 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 464 | |
414c70cb LG |
465 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
466 | } | |
7ad68e2f DB |
467 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
468 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
469 | |
470 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
471 | struct device_attribute *attr, char *buf) | |
472 | { | |
a5766f11 | 473 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 474 | |
414c70cb LG |
475 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
476 | } | |
7ad68e2f DB |
477 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
478 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 479 | |
414c70cb LG |
480 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
481 | struct device_attribute *attr, char *buf) | |
482 | { | |
a5766f11 | 483 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 484 | |
4fca9545 DB |
485 | return regulator_print_opmode(buf, |
486 | rdev->constraints->state_mem.mode); | |
414c70cb | 487 | } |
7ad68e2f DB |
488 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
489 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
490 | |
491 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
492 | struct device_attribute *attr, char *buf) | |
493 | { | |
a5766f11 | 494 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 495 | |
4fca9545 DB |
496 | return regulator_print_opmode(buf, |
497 | rdev->constraints->state_disk.mode); | |
414c70cb | 498 | } |
7ad68e2f DB |
499 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
500 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
501 | |
502 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
503 | struct device_attribute *attr, char *buf) | |
504 | { | |
a5766f11 | 505 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 506 | |
4fca9545 DB |
507 | return regulator_print_opmode(buf, |
508 | rdev->constraints->state_standby.mode); | |
414c70cb | 509 | } |
7ad68e2f DB |
510 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
511 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
512 | |
513 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
514 | struct device_attribute *attr, char *buf) | |
515 | { | |
a5766f11 | 516 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 517 | |
4fca9545 DB |
518 | return regulator_print_state(buf, |
519 | rdev->constraints->state_mem.enabled); | |
414c70cb | 520 | } |
7ad68e2f DB |
521 | static DEVICE_ATTR(suspend_mem_state, 0444, |
522 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
523 | |
524 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
525 | struct device_attribute *attr, char *buf) | |
526 | { | |
a5766f11 | 527 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 528 | |
4fca9545 DB |
529 | return regulator_print_state(buf, |
530 | rdev->constraints->state_disk.enabled); | |
414c70cb | 531 | } |
7ad68e2f DB |
532 | static DEVICE_ATTR(suspend_disk_state, 0444, |
533 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
534 | |
535 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
536 | struct device_attribute *attr, char *buf) | |
537 | { | |
a5766f11 | 538 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 539 | |
4fca9545 DB |
540 | return regulator_print_state(buf, |
541 | rdev->constraints->state_standby.enabled); | |
414c70cb | 542 | } |
7ad68e2f DB |
543 | static DEVICE_ATTR(suspend_standby_state, 0444, |
544 | regulator_suspend_standby_state_show, NULL); | |
545 | ||
bc558a60 | 546 | |
7ad68e2f DB |
547 | /* |
548 | * These are the only attributes are present for all regulators. | |
549 | * Other attributes are a function of regulator functionality. | |
550 | */ | |
414c70cb | 551 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 552 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
553 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
554 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
555 | __ATTR_NULL, |
556 | }; | |
557 | ||
558 | static void regulator_dev_release(struct device *dev) | |
559 | { | |
a5766f11 | 560 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
561 | kfree(rdev); |
562 | } | |
563 | ||
564 | static struct class regulator_class = { | |
565 | .name = "regulator", | |
566 | .dev_release = regulator_dev_release, | |
567 | .dev_attrs = regulator_dev_attrs, | |
568 | }; | |
569 | ||
570 | /* Calculate the new optimum regulator operating mode based on the new total | |
571 | * consumer load. All locks held by caller */ | |
572 | static void drms_uA_update(struct regulator_dev *rdev) | |
573 | { | |
574 | struct regulator *sibling; | |
575 | int current_uA = 0, output_uV, input_uV, err; | |
576 | unsigned int mode; | |
577 | ||
578 | err = regulator_check_drms(rdev); | |
579 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
580 | (!rdev->desc->ops->get_voltage && |
581 | !rdev->desc->ops->get_voltage_sel) || | |
582 | !rdev->desc->ops->set_mode) | |
036de8ef | 583 | return; |
414c70cb LG |
584 | |
585 | /* get output voltage */ | |
1bf5a1f8 | 586 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
587 | if (output_uV <= 0) |
588 | return; | |
589 | ||
590 | /* get input voltage */ | |
1bf5a1f8 MB |
591 | input_uV = 0; |
592 | if (rdev->supply) | |
593 | input_uV = _regulator_get_voltage(rdev); | |
594 | if (input_uV <= 0) | |
414c70cb LG |
595 | input_uV = rdev->constraints->input_uV; |
596 | if (input_uV <= 0) | |
597 | return; | |
598 | ||
599 | /* calc total requested load */ | |
600 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 601 | current_uA += sibling->uA_load; |
414c70cb LG |
602 | |
603 | /* now get the optimum mode for our new total regulator load */ | |
604 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
605 | output_uV, current_uA); | |
606 | ||
607 | /* check the new mode is allowed */ | |
608 | err = regulator_check_mode(rdev, mode); | |
609 | if (err == 0) | |
610 | rdev->desc->ops->set_mode(rdev, mode); | |
611 | } | |
612 | ||
613 | static int suspend_set_state(struct regulator_dev *rdev, | |
614 | struct regulator_state *rstate) | |
615 | { | |
616 | int ret = 0; | |
638f85c5 MB |
617 | bool can_set_state; |
618 | ||
619 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
620 | rdev->desc->ops->set_suspend_disable; | |
621 | ||
622 | /* If we have no suspend mode configration don't set anything; | |
623 | * only warn if the driver actually makes the suspend mode | |
624 | * configurable. | |
625 | */ | |
626 | if (!rstate->enabled && !rstate->disabled) { | |
627 | if (can_set_state) | |
5da84fd9 | 628 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
629 | return 0; |
630 | } | |
631 | ||
632 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 633 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
634 | return -EINVAL; |
635 | } | |
414c70cb | 636 | |
638f85c5 | 637 | if (!can_set_state) { |
5da84fd9 | 638 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 639 | return -EINVAL; |
a5766f11 | 640 | } |
414c70cb LG |
641 | |
642 | if (rstate->enabled) | |
643 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
644 | else | |
645 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
646 | if (ret < 0) { | |
5da84fd9 | 647 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
648 | return ret; |
649 | } | |
650 | ||
651 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
652 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
653 | if (ret < 0) { | |
5da84fd9 | 654 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
655 | return ret; |
656 | } | |
657 | } | |
658 | ||
659 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
660 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
661 | if (ret < 0) { | |
5da84fd9 | 662 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
663 | return ret; |
664 | } | |
665 | } | |
666 | return ret; | |
667 | } | |
668 | ||
669 | /* locks held by caller */ | |
670 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
671 | { | |
672 | if (!rdev->constraints) | |
673 | return -EINVAL; | |
674 | ||
675 | switch (state) { | |
676 | case PM_SUSPEND_STANDBY: | |
677 | return suspend_set_state(rdev, | |
678 | &rdev->constraints->state_standby); | |
679 | case PM_SUSPEND_MEM: | |
680 | return suspend_set_state(rdev, | |
681 | &rdev->constraints->state_mem); | |
682 | case PM_SUSPEND_MAX: | |
683 | return suspend_set_state(rdev, | |
684 | &rdev->constraints->state_disk); | |
685 | default: | |
686 | return -EINVAL; | |
687 | } | |
688 | } | |
689 | ||
690 | static void print_constraints(struct regulator_dev *rdev) | |
691 | { | |
692 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 693 | char buf[80] = ""; |
8f031b48 MB |
694 | int count = 0; |
695 | int ret; | |
414c70cb | 696 | |
8f031b48 | 697 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 698 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
699 | count += sprintf(buf + count, "%d mV ", |
700 | constraints->min_uV / 1000); | |
414c70cb | 701 | else |
8f031b48 MB |
702 | count += sprintf(buf + count, "%d <--> %d mV ", |
703 | constraints->min_uV / 1000, | |
704 | constraints->max_uV / 1000); | |
705 | } | |
706 | ||
707 | if (!constraints->min_uV || | |
708 | constraints->min_uV != constraints->max_uV) { | |
709 | ret = _regulator_get_voltage(rdev); | |
710 | if (ret > 0) | |
711 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
712 | } | |
713 | ||
714 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 715 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
716 | count += sprintf(buf + count, "%d mA ", |
717 | constraints->min_uA / 1000); | |
414c70cb | 718 | else |
8f031b48 MB |
719 | count += sprintf(buf + count, "%d <--> %d mA ", |
720 | constraints->min_uA / 1000, | |
721 | constraints->max_uA / 1000); | |
722 | } | |
723 | ||
724 | if (!constraints->min_uA || | |
725 | constraints->min_uA != constraints->max_uA) { | |
726 | ret = _regulator_get_current_limit(rdev); | |
727 | if (ret > 0) | |
e4a6376b | 728 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 729 | } |
8f031b48 | 730 | |
414c70cb LG |
731 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
732 | count += sprintf(buf + count, "fast "); | |
733 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
734 | count += sprintf(buf + count, "normal "); | |
735 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
736 | count += sprintf(buf + count, "idle "); | |
737 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
738 | count += sprintf(buf + count, "standby"); | |
739 | ||
5da84fd9 | 740 | rdev_info(rdev, "regulator: %s\n", buf); |
414c70cb LG |
741 | } |
742 | ||
e79055d6 | 743 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 744 | struct regulation_constraints *constraints) |
a5766f11 | 745 | { |
e5fda26c | 746 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 | 747 | int ret; |
3a93f2a9 | 748 | unsigned selector; |
af5866c9 MB |
749 | |
750 | /* do we need to apply the constraint voltage */ | |
751 | if (rdev->constraints->apply_uV && | |
752 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
753 | ops->set_voltage) { | |
754 | ret = ops->set_voltage(rdev, | |
3a93f2a9 MB |
755 | rdev->constraints->min_uV, |
756 | rdev->constraints->max_uV, | |
757 | &selector); | |
af5866c9 | 758 | if (ret < 0) { |
5da84fd9 JP |
759 | rdev_err(rdev, "failed to apply %duV constraint\n", |
760 | rdev->constraints->min_uV); | |
af5866c9 MB |
761 | rdev->constraints = NULL; |
762 | return ret; | |
763 | } | |
764 | } | |
e06f5b4f | 765 | |
4367cfdc DB |
766 | /* constrain machine-level voltage specs to fit |
767 | * the actual range supported by this regulator. | |
768 | */ | |
769 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
770 | int count = rdev->desc->n_voltages; | |
771 | int i; | |
772 | int min_uV = INT_MAX; | |
773 | int max_uV = INT_MIN; | |
774 | int cmin = constraints->min_uV; | |
775 | int cmax = constraints->max_uV; | |
776 | ||
3e590918 MB |
777 | /* it's safe to autoconfigure fixed-voltage supplies |
778 | and the constraints are used by list_voltage. */ | |
4367cfdc | 779 | if (count == 1 && !cmin) { |
3e590918 | 780 | cmin = 1; |
4367cfdc | 781 | cmax = INT_MAX; |
3e590918 MB |
782 | constraints->min_uV = cmin; |
783 | constraints->max_uV = cmax; | |
4367cfdc DB |
784 | } |
785 | ||
3e2b9abd MB |
786 | /* voltage constraints are optional */ |
787 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 788 | return 0; |
3e2b9abd | 789 | |
4367cfdc | 790 | /* else require explicit machine-level constraints */ |
3e2b9abd | 791 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 792 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 793 | return -EINVAL; |
4367cfdc DB |
794 | } |
795 | ||
796 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
797 | for (i = 0; i < count; i++) { | |
798 | int value; | |
799 | ||
800 | value = ops->list_voltage(rdev, i); | |
801 | if (value <= 0) | |
802 | continue; | |
803 | ||
804 | /* maybe adjust [min_uV..max_uV] */ | |
805 | if (value >= cmin && value < min_uV) | |
806 | min_uV = value; | |
807 | if (value <= cmax && value > max_uV) | |
808 | max_uV = value; | |
809 | } | |
810 | ||
811 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
812 | if (max_uV < min_uV) { | |
5da84fd9 | 813 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 814 | return -EINVAL; |
4367cfdc DB |
815 | } |
816 | ||
817 | /* use regulator's subset of machine constraints */ | |
818 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
819 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
820 | constraints->min_uV, min_uV); | |
4367cfdc DB |
821 | constraints->min_uV = min_uV; |
822 | } | |
823 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
824 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
825 | constraints->max_uV, max_uV); | |
4367cfdc DB |
826 | constraints->max_uV = max_uV; |
827 | } | |
828 | } | |
829 | ||
e79055d6 MB |
830 | return 0; |
831 | } | |
832 | ||
833 | /** | |
834 | * set_machine_constraints - sets regulator constraints | |
835 | * @rdev: regulator source | |
836 | * @constraints: constraints to apply | |
837 | * | |
838 | * Allows platform initialisation code to define and constrain | |
839 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
840 | * Constraints *must* be set by platform code in order for some | |
841 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
842 | * set_mode. | |
843 | */ | |
844 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 845 | const struct regulation_constraints *constraints) |
e79055d6 MB |
846 | { |
847 | int ret = 0; | |
e79055d6 MB |
848 | struct regulator_ops *ops = rdev->desc->ops; |
849 | ||
f8c12fe3 MB |
850 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
851 | GFP_KERNEL); | |
852 | if (!rdev->constraints) | |
853 | return -ENOMEM; | |
af5866c9 | 854 | |
f8c12fe3 | 855 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
856 | if (ret != 0) |
857 | goto out; | |
858 | ||
a5766f11 | 859 | /* do we need to setup our suspend state */ |
e06f5b4f | 860 | if (constraints->initial_state) { |
f8c12fe3 | 861 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 862 | if (ret < 0) { |
5da84fd9 | 863 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
864 | rdev->constraints = NULL; |
865 | goto out; | |
866 | } | |
867 | } | |
a5766f11 | 868 | |
a308466c MB |
869 | if (constraints->initial_mode) { |
870 | if (!ops->set_mode) { | |
5da84fd9 | 871 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
872 | ret = -EINVAL; |
873 | goto out; | |
874 | } | |
875 | ||
f8c12fe3 | 876 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 877 | if (ret < 0) { |
5da84fd9 | 878 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
879 | goto out; |
880 | } | |
881 | } | |
882 | ||
cacf90f2 MB |
883 | /* If the constraints say the regulator should be on at this point |
884 | * and we have control then make sure it is enabled. | |
885 | */ | |
f8c12fe3 MB |
886 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
887 | ops->enable) { | |
e5fda26c MB |
888 | ret = ops->enable(rdev); |
889 | if (ret < 0) { | |
5da84fd9 | 890 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
891 | rdev->constraints = NULL; |
892 | goto out; | |
893 | } | |
894 | } | |
895 | ||
a5766f11 LG |
896 | print_constraints(rdev); |
897 | out: | |
898 | return ret; | |
899 | } | |
900 | ||
901 | /** | |
902 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
903 | * @rdev: regulator name |
904 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
905 | * |
906 | * Called by platform initialisation code to set the supply regulator for this | |
907 | * regulator. This ensures that a regulators supply will also be enabled by the | |
908 | * core if it's child is enabled. | |
909 | */ | |
910 | static int set_supply(struct regulator_dev *rdev, | |
911 | struct regulator_dev *supply_rdev) | |
912 | { | |
913 | int err; | |
914 | ||
915 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
916 | "supply"); | |
917 | if (err) { | |
5da84fd9 JP |
918 | rdev_err(rdev, "could not add device link %s err %d\n", |
919 | supply_rdev->dev.kobj.name, err); | |
a5766f11 LG |
920 | goto out; |
921 | } | |
922 | rdev->supply = supply_rdev; | |
923 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
924 | out: | |
925 | return err; | |
926 | } | |
927 | ||
928 | /** | |
06c63f93 | 929 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
930 | * @rdev: regulator source |
931 | * @consumer_dev: device the supply applies to | |
40f9244f | 932 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 933 | * @supply: symbolic name for supply |
a5766f11 LG |
934 | * |
935 | * Allows platform initialisation code to map physical regulator | |
936 | * sources to symbolic names for supplies for use by devices. Devices | |
937 | * should use these symbolic names to request regulators, avoiding the | |
938 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
939 | * |
940 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
941 | */ |
942 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
943 | struct device *consumer_dev, const char *consumer_dev_name, |
944 | const char *supply) | |
a5766f11 LG |
945 | { |
946 | struct regulator_map *node; | |
9ed2099e | 947 | int has_dev; |
a5766f11 | 948 | |
40f9244f MB |
949 | if (consumer_dev && consumer_dev_name) |
950 | return -EINVAL; | |
951 | ||
952 | if (!consumer_dev_name && consumer_dev) | |
953 | consumer_dev_name = dev_name(consumer_dev); | |
954 | ||
a5766f11 LG |
955 | if (supply == NULL) |
956 | return -EINVAL; | |
957 | ||
9ed2099e MB |
958 | if (consumer_dev_name != NULL) |
959 | has_dev = 1; | |
960 | else | |
961 | has_dev = 0; | |
962 | ||
6001e13c | 963 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
964 | if (node->dev_name && consumer_dev_name) { |
965 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
966 | continue; | |
967 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 968 | continue; |
23b5cc2a JN |
969 | } |
970 | ||
6001e13c DB |
971 | if (strcmp(node->supply, supply) != 0) |
972 | continue; | |
973 | ||
974 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
975 | dev_name(&node->regulator->dev), |
976 | node->regulator->desc->name, | |
977 | supply, | |
978 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
979 | return -EBUSY; |
980 | } | |
981 | ||
9ed2099e | 982 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
983 | if (node == NULL) |
984 | return -ENOMEM; | |
985 | ||
986 | node->regulator = rdev; | |
a5766f11 LG |
987 | node->supply = supply; |
988 | ||
9ed2099e MB |
989 | if (has_dev) { |
990 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
991 | if (node->dev_name == NULL) { | |
992 | kfree(node); | |
993 | return -ENOMEM; | |
994 | } | |
40f9244f MB |
995 | } |
996 | ||
a5766f11 LG |
997 | list_add(&node->list, ®ulator_map_list); |
998 | return 0; | |
999 | } | |
1000 | ||
0f1d747b MR |
1001 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1002 | { | |
1003 | struct regulator_map *node, *n; | |
1004 | ||
1005 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1006 | if (rdev == node->regulator) { | |
1007 | list_del(&node->list); | |
40f9244f | 1008 | kfree(node->dev_name); |
0f1d747b | 1009 | kfree(node); |
0f1d747b MR |
1010 | } |
1011 | } | |
1012 | } | |
1013 | ||
414c70cb LG |
1014 | #define REG_STR_SIZE 32 |
1015 | ||
1016 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1017 | struct device *dev, | |
1018 | const char *supply_name) | |
1019 | { | |
1020 | struct regulator *regulator; | |
1021 | char buf[REG_STR_SIZE]; | |
1022 | int err, size; | |
1023 | ||
1024 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1025 | if (regulator == NULL) | |
1026 | return NULL; | |
1027 | ||
1028 | mutex_lock(&rdev->mutex); | |
1029 | regulator->rdev = rdev; | |
1030 | list_add(®ulator->list, &rdev->consumer_list); | |
1031 | ||
1032 | if (dev) { | |
1033 | /* create a 'requested_microamps_name' sysfs entry */ | |
1034 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1035 | supply_name); | |
1036 | if (size >= REG_STR_SIZE) | |
1037 | goto overflow_err; | |
1038 | ||
1039 | regulator->dev = dev; | |
4f26a2ab | 1040 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1041 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1042 | if (regulator->dev_attr.attr.name == NULL) | |
1043 | goto attr_name_err; | |
1044 | ||
414c70cb LG |
1045 | regulator->dev_attr.attr.mode = 0444; |
1046 | regulator->dev_attr.show = device_requested_uA_show; | |
1047 | err = device_create_file(dev, ®ulator->dev_attr); | |
1048 | if (err < 0) { | |
5da84fd9 | 1049 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1050 | goto attr_name_err; |
1051 | } | |
1052 | ||
1053 | /* also add a link to the device sysfs entry */ | |
1054 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1055 | dev->kobj.name, supply_name); | |
1056 | if (size >= REG_STR_SIZE) | |
1057 | goto attr_err; | |
1058 | ||
1059 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1060 | if (regulator->supply_name == NULL) | |
1061 | goto attr_err; | |
1062 | ||
1063 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1064 | buf); | |
1065 | if (err) { | |
5da84fd9 JP |
1066 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1067 | dev->kobj.name, err); | |
414c70cb LG |
1068 | goto link_name_err; |
1069 | } | |
1070 | } | |
1071 | mutex_unlock(&rdev->mutex); | |
1072 | return regulator; | |
1073 | link_name_err: | |
1074 | kfree(regulator->supply_name); | |
1075 | attr_err: | |
1076 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1077 | attr_name_err: | |
1078 | kfree(regulator->dev_attr.attr.name); | |
1079 | overflow_err: | |
1080 | list_del(®ulator->list); | |
1081 | kfree(regulator); | |
1082 | mutex_unlock(&rdev->mutex); | |
1083 | return NULL; | |
1084 | } | |
1085 | ||
31aae2be MB |
1086 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1087 | { | |
1088 | if (!rdev->desc->ops->enable_time) | |
1089 | return 0; | |
1090 | return rdev->desc->ops->enable_time(rdev); | |
1091 | } | |
1092 | ||
5ffbd136 MB |
1093 | /* Internal regulator request function */ |
1094 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1095 | int exclusive) | |
414c70cb LG |
1096 | { |
1097 | struct regulator_dev *rdev; | |
1098 | struct regulator_map *map; | |
1099 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1100 | const char *devname = NULL; |
5ffbd136 | 1101 | int ret; |
414c70cb LG |
1102 | |
1103 | if (id == NULL) { | |
5da84fd9 | 1104 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1105 | return regulator; |
1106 | } | |
1107 | ||
40f9244f MB |
1108 | if (dev) |
1109 | devname = dev_name(dev); | |
1110 | ||
414c70cb LG |
1111 | mutex_lock(®ulator_list_mutex); |
1112 | ||
1113 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1114 | /* If the mapping has a device set up it must match */ |
1115 | if (map->dev_name && | |
1116 | (!devname || strcmp(map->dev_name, devname))) | |
1117 | continue; | |
1118 | ||
1119 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1120 | rdev = map->regulator; |
414c70cb | 1121 | goto found; |
a5766f11 | 1122 | } |
414c70cb | 1123 | } |
34abbd68 | 1124 | |
688fe99a MB |
1125 | if (board_wants_dummy_regulator) { |
1126 | rdev = dummy_regulator_rdev; | |
1127 | goto found; | |
1128 | } | |
1129 | ||
34abbd68 MB |
1130 | #ifdef CONFIG_REGULATOR_DUMMY |
1131 | if (!devname) | |
1132 | devname = "deviceless"; | |
1133 | ||
1134 | /* If the board didn't flag that it was fully constrained then | |
1135 | * substitute in a dummy regulator so consumers can continue. | |
1136 | */ | |
1137 | if (!has_full_constraints) { | |
5da84fd9 JP |
1138 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1139 | devname, id); | |
34abbd68 MB |
1140 | rdev = dummy_regulator_rdev; |
1141 | goto found; | |
1142 | } | |
1143 | #endif | |
1144 | ||
414c70cb LG |
1145 | mutex_unlock(®ulator_list_mutex); |
1146 | return regulator; | |
1147 | ||
1148 | found: | |
5ffbd136 MB |
1149 | if (rdev->exclusive) { |
1150 | regulator = ERR_PTR(-EPERM); | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | if (exclusive && rdev->open_count) { | |
1155 | regulator = ERR_PTR(-EBUSY); | |
1156 | goto out; | |
1157 | } | |
1158 | ||
a5766f11 LG |
1159 | if (!try_module_get(rdev->owner)) |
1160 | goto out; | |
1161 | ||
414c70cb LG |
1162 | regulator = create_regulator(rdev, dev, id); |
1163 | if (regulator == NULL) { | |
1164 | regulator = ERR_PTR(-ENOMEM); | |
1165 | module_put(rdev->owner); | |
1166 | } | |
1167 | ||
5ffbd136 MB |
1168 | rdev->open_count++; |
1169 | if (exclusive) { | |
1170 | rdev->exclusive = 1; | |
1171 | ||
1172 | ret = _regulator_is_enabled(rdev); | |
1173 | if (ret > 0) | |
1174 | rdev->use_count = 1; | |
1175 | else | |
1176 | rdev->use_count = 0; | |
1177 | } | |
1178 | ||
a5766f11 | 1179 | out: |
414c70cb | 1180 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1181 | |
414c70cb LG |
1182 | return regulator; |
1183 | } | |
5ffbd136 MB |
1184 | |
1185 | /** | |
1186 | * regulator_get - lookup and obtain a reference to a regulator. | |
1187 | * @dev: device for regulator "consumer" | |
1188 | * @id: Supply name or regulator ID. | |
1189 | * | |
1190 | * Returns a struct regulator corresponding to the regulator producer, | |
1191 | * or IS_ERR() condition containing errno. | |
1192 | * | |
1193 | * Use of supply names configured via regulator_set_device_supply() is | |
1194 | * strongly encouraged. It is recommended that the supply name used | |
1195 | * should match the name used for the supply and/or the relevant | |
1196 | * device pins in the datasheet. | |
1197 | */ | |
1198 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1199 | { | |
1200 | return _regulator_get(dev, id, 0); | |
1201 | } | |
414c70cb LG |
1202 | EXPORT_SYMBOL_GPL(regulator_get); |
1203 | ||
5ffbd136 MB |
1204 | /** |
1205 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1206 | * @dev: device for regulator "consumer" | |
1207 | * @id: Supply name or regulator ID. | |
1208 | * | |
1209 | * Returns a struct regulator corresponding to the regulator producer, | |
1210 | * or IS_ERR() condition containing errno. Other consumers will be | |
1211 | * unable to obtain this reference is held and the use count for the | |
1212 | * regulator will be initialised to reflect the current state of the | |
1213 | * regulator. | |
1214 | * | |
1215 | * This is intended for use by consumers which cannot tolerate shared | |
1216 | * use of the regulator such as those which need to force the | |
1217 | * regulator off for correct operation of the hardware they are | |
1218 | * controlling. | |
1219 | * | |
1220 | * Use of supply names configured via regulator_set_device_supply() is | |
1221 | * strongly encouraged. It is recommended that the supply name used | |
1222 | * should match the name used for the supply and/or the relevant | |
1223 | * device pins in the datasheet. | |
1224 | */ | |
1225 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1226 | { | |
1227 | return _regulator_get(dev, id, 1); | |
1228 | } | |
1229 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1230 | ||
414c70cb LG |
1231 | /** |
1232 | * regulator_put - "free" the regulator source | |
1233 | * @regulator: regulator source | |
1234 | * | |
1235 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1236 | * regulator source are balanced by regulator_disable calls prior to calling | |
1237 | * this function. | |
1238 | */ | |
1239 | void regulator_put(struct regulator *regulator) | |
1240 | { | |
1241 | struct regulator_dev *rdev; | |
1242 | ||
1243 | if (regulator == NULL || IS_ERR(regulator)) | |
1244 | return; | |
1245 | ||
414c70cb LG |
1246 | mutex_lock(®ulator_list_mutex); |
1247 | rdev = regulator->rdev; | |
1248 | ||
1249 | /* remove any sysfs entries */ | |
1250 | if (regulator->dev) { | |
1251 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1252 | kfree(regulator->supply_name); | |
1253 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1254 | kfree(regulator->dev_attr.attr.name); | |
1255 | } | |
1256 | list_del(®ulator->list); | |
1257 | kfree(regulator); | |
1258 | ||
5ffbd136 MB |
1259 | rdev->open_count--; |
1260 | rdev->exclusive = 0; | |
1261 | ||
414c70cb LG |
1262 | module_put(rdev->owner); |
1263 | mutex_unlock(®ulator_list_mutex); | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(regulator_put); | |
1266 | ||
9a2372fa MB |
1267 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1268 | { | |
1269 | if (!rdev->constraints) | |
1270 | return 0; | |
1271 | ||
1272 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1273 | return 1; | |
1274 | else | |
1275 | return 0; | |
1276 | } | |
1277 | ||
414c70cb LG |
1278 | /* locks held by regulator_enable() */ |
1279 | static int _regulator_enable(struct regulator_dev *rdev) | |
1280 | { | |
31aae2be | 1281 | int ret, delay; |
414c70cb | 1282 | |
acaf6ffe BJ |
1283 | if (rdev->use_count == 0) { |
1284 | /* do we need to enable the supply regulator first */ | |
1285 | if (rdev->supply) { | |
1286 | mutex_lock(&rdev->supply->mutex); | |
1287 | ret = _regulator_enable(rdev->supply); | |
1288 | mutex_unlock(&rdev->supply->mutex); | |
1289 | if (ret < 0) { | |
5da84fd9 | 1290 | rdev_err(rdev, "failed to enable: %d\n", ret); |
acaf6ffe BJ |
1291 | return ret; |
1292 | } | |
414c70cb LG |
1293 | } |
1294 | } | |
1295 | ||
1296 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1297 | if (rdev->constraints && |
1298 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1299 | drms_uA_update(rdev); | |
414c70cb | 1300 | |
9a2372fa MB |
1301 | if (rdev->use_count == 0) { |
1302 | /* The regulator may on if it's not switchable or left on */ | |
1303 | ret = _regulator_is_enabled(rdev); | |
1304 | if (ret == -EINVAL || ret == 0) { | |
1305 | if (!_regulator_can_change_status(rdev)) | |
1306 | return -EPERM; | |
1307 | ||
31aae2be | 1308 | if (!rdev->desc->ops->enable) |
9a2372fa | 1309 | return -EINVAL; |
31aae2be MB |
1310 | |
1311 | /* Query before enabling in case configuration | |
1312 | * dependant. */ | |
1313 | ret = _regulator_get_enable_time(rdev); | |
1314 | if (ret >= 0) { | |
1315 | delay = ret; | |
1316 | } else { | |
5da84fd9 | 1317 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1318 | ret); |
31aae2be | 1319 | delay = 0; |
9a2372fa | 1320 | } |
31aae2be | 1321 | |
02fa3ec0 MB |
1322 | trace_regulator_enable(rdev_get_name(rdev)); |
1323 | ||
31aae2be MB |
1324 | /* Allow the regulator to ramp; it would be useful |
1325 | * to extend this for bulk operations so that the | |
1326 | * regulators can ramp together. */ | |
1327 | ret = rdev->desc->ops->enable(rdev); | |
1328 | if (ret < 0) | |
1329 | return ret; | |
1330 | ||
02fa3ec0 MB |
1331 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1332 | ||
e36c1df8 | 1333 | if (delay >= 1000) { |
31aae2be | 1334 | mdelay(delay / 1000); |
e36c1df8 AL |
1335 | udelay(delay % 1000); |
1336 | } else if (delay) { | |
31aae2be | 1337 | udelay(delay); |
e36c1df8 | 1338 | } |
31aae2be | 1339 | |
02fa3ec0 MB |
1340 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1341 | ||
a7433cff | 1342 | } else if (ret < 0) { |
5da84fd9 | 1343 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1344 | return ret; |
1345 | } | |
a7433cff | 1346 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1347 | } |
1348 | ||
9a2372fa MB |
1349 | rdev->use_count++; |
1350 | ||
1351 | return 0; | |
414c70cb LG |
1352 | } |
1353 | ||
1354 | /** | |
1355 | * regulator_enable - enable regulator output | |
1356 | * @regulator: regulator source | |
1357 | * | |
cf7bbcdf MB |
1358 | * Request that the regulator be enabled with the regulator output at |
1359 | * the predefined voltage or current value. Calls to regulator_enable() | |
1360 | * must be balanced with calls to regulator_disable(). | |
1361 | * | |
414c70cb | 1362 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1363 | * hardwired in the regulator. |
414c70cb LG |
1364 | */ |
1365 | int regulator_enable(struct regulator *regulator) | |
1366 | { | |
412aec61 DB |
1367 | struct regulator_dev *rdev = regulator->rdev; |
1368 | int ret = 0; | |
414c70cb | 1369 | |
412aec61 | 1370 | mutex_lock(&rdev->mutex); |
cd94b505 | 1371 | ret = _regulator_enable(rdev); |
412aec61 | 1372 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1373 | return ret; |
1374 | } | |
1375 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1376 | ||
1377 | /* locks held by regulator_disable() */ | |
8cbf811d JC |
1378 | static int _regulator_disable(struct regulator_dev *rdev, |
1379 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1380 | { |
1381 | int ret = 0; | |
b12a1e29 | 1382 | *supply_rdev_ptr = NULL; |
414c70cb | 1383 | |
cd94b505 | 1384 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1385 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1386 | return -EIO; |
1387 | ||
414c70cb | 1388 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1389 | if (rdev->use_count == 1 && |
1390 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1391 | |
1392 | /* we are last user */ | |
9a2372fa MB |
1393 | if (_regulator_can_change_status(rdev) && |
1394 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1395 | trace_regulator_disable(rdev_get_name(rdev)); |
1396 | ||
414c70cb LG |
1397 | ret = rdev->desc->ops->disable(rdev); |
1398 | if (ret < 0) { | |
5da84fd9 | 1399 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1400 | return ret; |
1401 | } | |
84b68263 | 1402 | |
02fa3ec0 MB |
1403 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1404 | ||
84b68263 MB |
1405 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1406 | NULL); | |
414c70cb LG |
1407 | } |
1408 | ||
1409 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1410 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1411 | |
1412 | rdev->use_count = 0; | |
1413 | } else if (rdev->use_count > 1) { | |
1414 | ||
1415 | if (rdev->constraints && | |
1416 | (rdev->constraints->valid_ops_mask & | |
1417 | REGULATOR_CHANGE_DRMS)) | |
1418 | drms_uA_update(rdev); | |
1419 | ||
1420 | rdev->use_count--; | |
1421 | } | |
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | /** | |
1426 | * regulator_disable - disable regulator output | |
1427 | * @regulator: regulator source | |
1428 | * | |
cf7bbcdf MB |
1429 | * Disable the regulator output voltage or current. Calls to |
1430 | * regulator_enable() must be balanced with calls to | |
1431 | * regulator_disable(). | |
69279fb9 | 1432 | * |
414c70cb | 1433 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1434 | * devices have it enabled, the regulator device supports disabling and |
1435 | * machine constraints permit this operation. | |
414c70cb LG |
1436 | */ |
1437 | int regulator_disable(struct regulator *regulator) | |
1438 | { | |
412aec61 | 1439 | struct regulator_dev *rdev = regulator->rdev; |
8cbf811d | 1440 | struct regulator_dev *supply_rdev = NULL; |
412aec61 | 1441 | int ret = 0; |
414c70cb | 1442 | |
412aec61 | 1443 | mutex_lock(&rdev->mutex); |
8cbf811d | 1444 | ret = _regulator_disable(rdev, &supply_rdev); |
412aec61 | 1445 | mutex_unlock(&rdev->mutex); |
8cbf811d JC |
1446 | |
1447 | /* decrease our supplies ref count and disable if required */ | |
1448 | while (supply_rdev != NULL) { | |
1449 | rdev = supply_rdev; | |
1450 | ||
1451 | mutex_lock(&rdev->mutex); | |
1452 | _regulator_disable(rdev, &supply_rdev); | |
1453 | mutex_unlock(&rdev->mutex); | |
1454 | } | |
1455 | ||
414c70cb LG |
1456 | return ret; |
1457 | } | |
1458 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1459 | ||
1460 | /* locks held by regulator_force_disable() */ | |
8cbf811d JC |
1461 | static int _regulator_force_disable(struct regulator_dev *rdev, |
1462 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1463 | { |
1464 | int ret = 0; | |
1465 | ||
1466 | /* force disable */ | |
1467 | if (rdev->desc->ops->disable) { | |
1468 | /* ah well, who wants to live forever... */ | |
1469 | ret = rdev->desc->ops->disable(rdev); | |
1470 | if (ret < 0) { | |
5da84fd9 | 1471 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1472 | return ret; |
1473 | } | |
1474 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1475 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1476 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1477 | } |
1478 | ||
1479 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1480 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1481 | |
1482 | rdev->use_count = 0; | |
1483 | return ret; | |
1484 | } | |
1485 | ||
1486 | /** | |
1487 | * regulator_force_disable - force disable regulator output | |
1488 | * @regulator: regulator source | |
1489 | * | |
1490 | * Forcibly disable the regulator output voltage or current. | |
1491 | * NOTE: this *will* disable the regulator output even if other consumer | |
1492 | * devices have it enabled. This should be used for situations when device | |
1493 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1494 | */ | |
1495 | int regulator_force_disable(struct regulator *regulator) | |
1496 | { | |
8cbf811d | 1497 | struct regulator_dev *supply_rdev = NULL; |
414c70cb LG |
1498 | int ret; |
1499 | ||
1500 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb | 1501 | regulator->uA_load = 0; |
8cbf811d | 1502 | ret = _regulator_force_disable(regulator->rdev, &supply_rdev); |
414c70cb | 1503 | mutex_unlock(®ulator->rdev->mutex); |
8cbf811d JC |
1504 | |
1505 | if (supply_rdev) | |
1506 | regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); | |
1507 | ||
414c70cb LG |
1508 | return ret; |
1509 | } | |
1510 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1511 | ||
1512 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1513 | { | |
9a7f6a4c | 1514 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1515 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1516 | return 1; |
414c70cb | 1517 | |
9332546f | 1518 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1519 | } |
1520 | ||
1521 | /** | |
1522 | * regulator_is_enabled - is the regulator output enabled | |
1523 | * @regulator: regulator source | |
1524 | * | |
412aec61 DB |
1525 | * Returns positive if the regulator driver backing the source/client |
1526 | * has requested that the device be enabled, zero if it hasn't, else a | |
1527 | * negative errno code. | |
1528 | * | |
1529 | * Note that the device backing this regulator handle can have multiple | |
1530 | * users, so it might be enabled even if regulator_enable() was never | |
1531 | * called for this particular source. | |
414c70cb LG |
1532 | */ |
1533 | int regulator_is_enabled(struct regulator *regulator) | |
1534 | { | |
9332546f MB |
1535 | int ret; |
1536 | ||
1537 | mutex_lock(®ulator->rdev->mutex); | |
1538 | ret = _regulator_is_enabled(regulator->rdev); | |
1539 | mutex_unlock(®ulator->rdev->mutex); | |
1540 | ||
1541 | return ret; | |
414c70cb LG |
1542 | } |
1543 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1544 | ||
4367cfdc DB |
1545 | /** |
1546 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1547 | * @regulator: regulator source | |
1548 | * | |
1549 | * Returns number of selectors, or negative errno. Selectors are | |
1550 | * numbered starting at zero, and typically correspond to bitfields | |
1551 | * in hardware registers. | |
1552 | */ | |
1553 | int regulator_count_voltages(struct regulator *regulator) | |
1554 | { | |
1555 | struct regulator_dev *rdev = regulator->rdev; | |
1556 | ||
1557 | return rdev->desc->n_voltages ? : -EINVAL; | |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1560 | ||
1561 | /** | |
1562 | * regulator_list_voltage - enumerate supported voltages | |
1563 | * @regulator: regulator source | |
1564 | * @selector: identify voltage to list | |
1565 | * Context: can sleep | |
1566 | * | |
1567 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1568 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1569 | * negative errno. |
1570 | */ | |
1571 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1572 | { | |
1573 | struct regulator_dev *rdev = regulator->rdev; | |
1574 | struct regulator_ops *ops = rdev->desc->ops; | |
1575 | int ret; | |
1576 | ||
1577 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1578 | return -EINVAL; | |
1579 | ||
1580 | mutex_lock(&rdev->mutex); | |
1581 | ret = ops->list_voltage(rdev, selector); | |
1582 | mutex_unlock(&rdev->mutex); | |
1583 | ||
1584 | if (ret > 0) { | |
1585 | if (ret < rdev->constraints->min_uV) | |
1586 | ret = 0; | |
1587 | else if (ret > rdev->constraints->max_uV) | |
1588 | ret = 0; | |
1589 | } | |
1590 | ||
1591 | return ret; | |
1592 | } | |
1593 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1594 | ||
a7a1ad90 MB |
1595 | /** |
1596 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1597 | * | |
1598 | * @regulator: Regulator to check. | |
1599 | * @min_uV: Minimum required voltage in uV. | |
1600 | * @max_uV: Maximum required voltage in uV. | |
1601 | * | |
1602 | * Returns a boolean or a negative error code. | |
1603 | */ | |
1604 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1605 | int min_uV, int max_uV) | |
1606 | { | |
1607 | int i, voltages, ret; | |
1608 | ||
1609 | ret = regulator_count_voltages(regulator); | |
1610 | if (ret < 0) | |
1611 | return ret; | |
1612 | voltages = ret; | |
1613 | ||
1614 | for (i = 0; i < voltages; i++) { | |
1615 | ret = regulator_list_voltage(regulator, i); | |
1616 | ||
1617 | if (ret >= min_uV && ret <= max_uV) | |
1618 | return 1; | |
1619 | } | |
1620 | ||
1621 | return 0; | |
1622 | } | |
1623 | ||
414c70cb LG |
1624 | /** |
1625 | * regulator_set_voltage - set regulator output voltage | |
1626 | * @regulator: regulator source | |
1627 | * @min_uV: Minimum required voltage in uV | |
1628 | * @max_uV: Maximum acceptable voltage in uV | |
1629 | * | |
1630 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1631 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1632 | * | |
1633 | * If the regulator is enabled then the voltage will change to the new value | |
1634 | * immediately otherwise if the regulator is disabled the regulator will | |
1635 | * output at the new voltage when enabled. | |
1636 | * | |
1637 | * NOTE: If the regulator is shared between several devices then the lowest | |
1638 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1639 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1640 | * calling this function otherwise this call will fail. |
1641 | */ | |
1642 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1643 | { | |
1644 | struct regulator_dev *rdev = regulator->rdev; | |
1645 | int ret; | |
3a93f2a9 | 1646 | unsigned selector; |
414c70cb LG |
1647 | |
1648 | mutex_lock(&rdev->mutex); | |
1649 | ||
1650 | /* sanity check */ | |
1651 | if (!rdev->desc->ops->set_voltage) { | |
1652 | ret = -EINVAL; | |
1653 | goto out; | |
1654 | } | |
1655 | ||
1656 | /* constraints check */ | |
1657 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1658 | if (ret < 0) | |
1659 | goto out; | |
1660 | regulator->min_uV = min_uV; | |
1661 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1662 | |
05fda3b1 TP |
1663 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1664 | if (ret < 0) | |
1665 | goto out; | |
1666 | ||
02fa3ec0 MB |
1667 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); |
1668 | ||
3a93f2a9 MB |
1669 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector); |
1670 | ||
1671 | if (rdev->desc->ops->list_voltage) | |
1672 | selector = rdev->desc->ops->list_voltage(rdev, selector); | |
1673 | else | |
1674 | selector = -1; | |
414c70cb | 1675 | |
02fa3ec0 MB |
1676 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1677 | ||
414c70cb | 1678 | out: |
b136fb44 | 1679 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1680 | mutex_unlock(&rdev->mutex); |
1681 | return ret; | |
1682 | } | |
1683 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1684 | ||
1685 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1686 | { | |
476c2d83 MB |
1687 | int sel; |
1688 | ||
1689 | if (rdev->desc->ops->get_voltage_sel) { | |
1690 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
1691 | if (sel < 0) | |
1692 | return sel; | |
1693 | return rdev->desc->ops->list_voltage(rdev, sel); | |
1694 | } | |
414c70cb LG |
1695 | if (rdev->desc->ops->get_voltage) |
1696 | return rdev->desc->ops->get_voltage(rdev); | |
1697 | else | |
1698 | return -EINVAL; | |
1699 | } | |
1700 | ||
1701 | /** | |
1702 | * regulator_get_voltage - get regulator output voltage | |
1703 | * @regulator: regulator source | |
1704 | * | |
1705 | * This returns the current regulator voltage in uV. | |
1706 | * | |
1707 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1708 | * function should not be used to determine regulator state. | |
1709 | */ | |
1710 | int regulator_get_voltage(struct regulator *regulator) | |
1711 | { | |
1712 | int ret; | |
1713 | ||
1714 | mutex_lock(®ulator->rdev->mutex); | |
1715 | ||
1716 | ret = _regulator_get_voltage(regulator->rdev); | |
1717 | ||
1718 | mutex_unlock(®ulator->rdev->mutex); | |
1719 | ||
1720 | return ret; | |
1721 | } | |
1722 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1723 | ||
1724 | /** | |
1725 | * regulator_set_current_limit - set regulator output current limit | |
1726 | * @regulator: regulator source | |
1727 | * @min_uA: Minimuum supported current in uA | |
1728 | * @max_uA: Maximum supported current in uA | |
1729 | * | |
1730 | * Sets current sink to the desired output current. This can be set during | |
1731 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1732 | * | |
1733 | * If the regulator is enabled then the current will change to the new value | |
1734 | * immediately otherwise if the regulator is disabled the regulator will | |
1735 | * output at the new current when enabled. | |
1736 | * | |
1737 | * NOTE: Regulator system constraints must be set for this regulator before | |
1738 | * calling this function otherwise this call will fail. | |
1739 | */ | |
1740 | int regulator_set_current_limit(struct regulator *regulator, | |
1741 | int min_uA, int max_uA) | |
1742 | { | |
1743 | struct regulator_dev *rdev = regulator->rdev; | |
1744 | int ret; | |
1745 | ||
1746 | mutex_lock(&rdev->mutex); | |
1747 | ||
1748 | /* sanity check */ | |
1749 | if (!rdev->desc->ops->set_current_limit) { | |
1750 | ret = -EINVAL; | |
1751 | goto out; | |
1752 | } | |
1753 | ||
1754 | /* constraints check */ | |
1755 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1756 | if (ret < 0) | |
1757 | goto out; | |
1758 | ||
1759 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1760 | out: | |
1761 | mutex_unlock(&rdev->mutex); | |
1762 | return ret; | |
1763 | } | |
1764 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1765 | ||
1766 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1767 | { | |
1768 | int ret; | |
1769 | ||
1770 | mutex_lock(&rdev->mutex); | |
1771 | ||
1772 | /* sanity check */ | |
1773 | if (!rdev->desc->ops->get_current_limit) { | |
1774 | ret = -EINVAL; | |
1775 | goto out; | |
1776 | } | |
1777 | ||
1778 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1779 | out: | |
1780 | mutex_unlock(&rdev->mutex); | |
1781 | return ret; | |
1782 | } | |
1783 | ||
1784 | /** | |
1785 | * regulator_get_current_limit - get regulator output current | |
1786 | * @regulator: regulator source | |
1787 | * | |
1788 | * This returns the current supplied by the specified current sink in uA. | |
1789 | * | |
1790 | * NOTE: If the regulator is disabled it will return the current value. This | |
1791 | * function should not be used to determine regulator state. | |
1792 | */ | |
1793 | int regulator_get_current_limit(struct regulator *regulator) | |
1794 | { | |
1795 | return _regulator_get_current_limit(regulator->rdev); | |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1798 | ||
1799 | /** | |
1800 | * regulator_set_mode - set regulator operating mode | |
1801 | * @regulator: regulator source | |
1802 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1803 | * | |
1804 | * Set regulator operating mode to increase regulator efficiency or improve | |
1805 | * regulation performance. | |
1806 | * | |
1807 | * NOTE: Regulator system constraints must be set for this regulator before | |
1808 | * calling this function otherwise this call will fail. | |
1809 | */ | |
1810 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1811 | { | |
1812 | struct regulator_dev *rdev = regulator->rdev; | |
1813 | int ret; | |
500b4ac9 | 1814 | int regulator_curr_mode; |
414c70cb LG |
1815 | |
1816 | mutex_lock(&rdev->mutex); | |
1817 | ||
1818 | /* sanity check */ | |
1819 | if (!rdev->desc->ops->set_mode) { | |
1820 | ret = -EINVAL; | |
1821 | goto out; | |
1822 | } | |
1823 | ||
500b4ac9 SI |
1824 | /* return if the same mode is requested */ |
1825 | if (rdev->desc->ops->get_mode) { | |
1826 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
1827 | if (regulator_curr_mode == mode) { | |
1828 | ret = 0; | |
1829 | goto out; | |
1830 | } | |
1831 | } | |
1832 | ||
414c70cb LG |
1833 | /* constraints check */ |
1834 | ret = regulator_check_mode(rdev, mode); | |
1835 | if (ret < 0) | |
1836 | goto out; | |
1837 | ||
1838 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1839 | out: | |
1840 | mutex_unlock(&rdev->mutex); | |
1841 | return ret; | |
1842 | } | |
1843 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1844 | ||
1845 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1846 | { | |
1847 | int ret; | |
1848 | ||
1849 | mutex_lock(&rdev->mutex); | |
1850 | ||
1851 | /* sanity check */ | |
1852 | if (!rdev->desc->ops->get_mode) { | |
1853 | ret = -EINVAL; | |
1854 | goto out; | |
1855 | } | |
1856 | ||
1857 | ret = rdev->desc->ops->get_mode(rdev); | |
1858 | out: | |
1859 | mutex_unlock(&rdev->mutex); | |
1860 | return ret; | |
1861 | } | |
1862 | ||
1863 | /** | |
1864 | * regulator_get_mode - get regulator operating mode | |
1865 | * @regulator: regulator source | |
1866 | * | |
1867 | * Get the current regulator operating mode. | |
1868 | */ | |
1869 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1870 | { | |
1871 | return _regulator_get_mode(regulator->rdev); | |
1872 | } | |
1873 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1874 | ||
1875 | /** | |
1876 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1877 | * @regulator: regulator source | |
1878 | * @uA_load: load current | |
1879 | * | |
1880 | * Notifies the regulator core of a new device load. This is then used by | |
1881 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1882 | * operating mode for the new regulator loading. | |
1883 | * | |
1884 | * Consumer devices notify their supply regulator of the maximum power | |
1885 | * they will require (can be taken from device datasheet in the power | |
1886 | * consumption tables) when they change operational status and hence power | |
1887 | * state. Examples of operational state changes that can affect power | |
1888 | * consumption are :- | |
1889 | * | |
1890 | * o Device is opened / closed. | |
1891 | * o Device I/O is about to begin or has just finished. | |
1892 | * o Device is idling in between work. | |
1893 | * | |
1894 | * This information is also exported via sysfs to userspace. | |
1895 | * | |
1896 | * DRMS will sum the total requested load on the regulator and change | |
1897 | * to the most efficient operating mode if platform constraints allow. | |
1898 | * | |
1899 | * Returns the new regulator mode or error. | |
1900 | */ | |
1901 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1902 | { | |
1903 | struct regulator_dev *rdev = regulator->rdev; | |
1904 | struct regulator *consumer; | |
1905 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1906 | unsigned int mode; | |
1907 | ||
1908 | mutex_lock(&rdev->mutex); | |
1909 | ||
1910 | regulator->uA_load = uA_load; | |
1911 | ret = regulator_check_drms(rdev); | |
1912 | if (ret < 0) | |
1913 | goto out; | |
1914 | ret = -EINVAL; | |
1915 | ||
1916 | /* sanity check */ | |
1917 | if (!rdev->desc->ops->get_optimum_mode) | |
1918 | goto out; | |
1919 | ||
1920 | /* get output voltage */ | |
1bf5a1f8 | 1921 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 1922 | if (output_uV <= 0) { |
5da84fd9 | 1923 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
1924 | goto out; |
1925 | } | |
1926 | ||
1927 | /* get input voltage */ | |
1bf5a1f8 MB |
1928 | input_uV = 0; |
1929 | if (rdev->supply) | |
1930 | input_uV = _regulator_get_voltage(rdev->supply); | |
1931 | if (input_uV <= 0) | |
414c70cb LG |
1932 | input_uV = rdev->constraints->input_uV; |
1933 | if (input_uV <= 0) { | |
5da84fd9 | 1934 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
1935 | goto out; |
1936 | } | |
1937 | ||
1938 | /* calc total requested load for this regulator */ | |
1939 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 1940 | total_uA_load += consumer->uA_load; |
414c70cb LG |
1941 | |
1942 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1943 | input_uV, output_uV, | |
1944 | total_uA_load); | |
e573520b DB |
1945 | ret = regulator_check_mode(rdev, mode); |
1946 | if (ret < 0) { | |
5da84fd9 JP |
1947 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
1948 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
1949 | goto out; |
1950 | } | |
1951 | ||
1952 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1953 | if (ret < 0) { |
5da84fd9 | 1954 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
1955 | goto out; |
1956 | } | |
1957 | ret = mode; | |
1958 | out: | |
1959 | mutex_unlock(&rdev->mutex); | |
1960 | return ret; | |
1961 | } | |
1962 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1963 | ||
1964 | /** | |
1965 | * regulator_register_notifier - register regulator event notifier | |
1966 | * @regulator: regulator source | |
69279fb9 | 1967 | * @nb: notifier block |
414c70cb LG |
1968 | * |
1969 | * Register notifier block to receive regulator events. | |
1970 | */ | |
1971 | int regulator_register_notifier(struct regulator *regulator, | |
1972 | struct notifier_block *nb) | |
1973 | { | |
1974 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1975 | nb); | |
1976 | } | |
1977 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1978 | ||
1979 | /** | |
1980 | * regulator_unregister_notifier - unregister regulator event notifier | |
1981 | * @regulator: regulator source | |
69279fb9 | 1982 | * @nb: notifier block |
414c70cb LG |
1983 | * |
1984 | * Unregister regulator event notifier block. | |
1985 | */ | |
1986 | int regulator_unregister_notifier(struct regulator *regulator, | |
1987 | struct notifier_block *nb) | |
1988 | { | |
1989 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1990 | nb); | |
1991 | } | |
1992 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1993 | ||
b136fb44 JC |
1994 | /* notify regulator consumers and downstream regulator consumers. |
1995 | * Note mutex must be held by caller. | |
1996 | */ | |
414c70cb LG |
1997 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1998 | unsigned long event, void *data) | |
1999 | { | |
2000 | struct regulator_dev *_rdev; | |
2001 | ||
2002 | /* call rdev chain first */ | |
414c70cb | 2003 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2004 | |
2005 | /* now notify regulator we supply */ | |
b136fb44 | 2006 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
2007 | mutex_lock(&_rdev->mutex); |
2008 | _notifier_call_chain(_rdev, event, data); | |
2009 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 2010 | } |
414c70cb LG |
2011 | } |
2012 | ||
2013 | /** | |
2014 | * regulator_bulk_get - get multiple regulator consumers | |
2015 | * | |
2016 | * @dev: Device to supply | |
2017 | * @num_consumers: Number of consumers to register | |
2018 | * @consumers: Configuration of consumers; clients are stored here. | |
2019 | * | |
2020 | * @return 0 on success, an errno on failure. | |
2021 | * | |
2022 | * This helper function allows drivers to get several regulator | |
2023 | * consumers in one operation. If any of the regulators cannot be | |
2024 | * acquired then any regulators that were allocated will be freed | |
2025 | * before returning to the caller. | |
2026 | */ | |
2027 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2028 | struct regulator_bulk_data *consumers) | |
2029 | { | |
2030 | int i; | |
2031 | int ret; | |
2032 | ||
2033 | for (i = 0; i < num_consumers; i++) | |
2034 | consumers[i].consumer = NULL; | |
2035 | ||
2036 | for (i = 0; i < num_consumers; i++) { | |
2037 | consumers[i].consumer = regulator_get(dev, | |
2038 | consumers[i].supply); | |
2039 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2040 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2041 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2042 | consumers[i].supply, ret); | |
414c70cb LG |
2043 | consumers[i].consumer = NULL; |
2044 | goto err; | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | return 0; | |
2049 | ||
2050 | err: | |
2051 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2052 | regulator_put(consumers[i].consumer); | |
2053 | ||
2054 | return ret; | |
2055 | } | |
2056 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2057 | ||
2058 | /** | |
2059 | * regulator_bulk_enable - enable multiple regulator consumers | |
2060 | * | |
2061 | * @num_consumers: Number of consumers | |
2062 | * @consumers: Consumer data; clients are stored here. | |
2063 | * @return 0 on success, an errno on failure | |
2064 | * | |
2065 | * This convenience API allows consumers to enable multiple regulator | |
2066 | * clients in a single API call. If any consumers cannot be enabled | |
2067 | * then any others that were enabled will be disabled again prior to | |
2068 | * return. | |
2069 | */ | |
2070 | int regulator_bulk_enable(int num_consumers, | |
2071 | struct regulator_bulk_data *consumers) | |
2072 | { | |
2073 | int i; | |
2074 | int ret; | |
2075 | ||
2076 | for (i = 0; i < num_consumers; i++) { | |
2077 | ret = regulator_enable(consumers[i].consumer); | |
2078 | if (ret != 0) | |
2079 | goto err; | |
2080 | } | |
2081 | ||
2082 | return 0; | |
2083 | ||
2084 | err: | |
5da84fd9 | 2085 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2086 | for (--i; i >= 0; --i) |
414c70cb LG |
2087 | regulator_disable(consumers[i].consumer); |
2088 | ||
2089 | return ret; | |
2090 | } | |
2091 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2092 | ||
2093 | /** | |
2094 | * regulator_bulk_disable - disable multiple regulator consumers | |
2095 | * | |
2096 | * @num_consumers: Number of consumers | |
2097 | * @consumers: Consumer data; clients are stored here. | |
2098 | * @return 0 on success, an errno on failure | |
2099 | * | |
2100 | * This convenience API allows consumers to disable multiple regulator | |
2101 | * clients in a single API call. If any consumers cannot be enabled | |
2102 | * then any others that were disabled will be disabled again prior to | |
2103 | * return. | |
2104 | */ | |
2105 | int regulator_bulk_disable(int num_consumers, | |
2106 | struct regulator_bulk_data *consumers) | |
2107 | { | |
2108 | int i; | |
2109 | int ret; | |
2110 | ||
2111 | for (i = 0; i < num_consumers; i++) { | |
2112 | ret = regulator_disable(consumers[i].consumer); | |
2113 | if (ret != 0) | |
2114 | goto err; | |
2115 | } | |
2116 | ||
2117 | return 0; | |
2118 | ||
2119 | err: | |
5da84fd9 | 2120 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2121 | for (--i; i >= 0; --i) |
414c70cb LG |
2122 | regulator_enable(consumers[i].consumer); |
2123 | ||
2124 | return ret; | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2127 | ||
2128 | /** | |
2129 | * regulator_bulk_free - free multiple regulator consumers | |
2130 | * | |
2131 | * @num_consumers: Number of consumers | |
2132 | * @consumers: Consumer data; clients are stored here. | |
2133 | * | |
2134 | * This convenience API allows consumers to free multiple regulator | |
2135 | * clients in a single API call. | |
2136 | */ | |
2137 | void regulator_bulk_free(int num_consumers, | |
2138 | struct regulator_bulk_data *consumers) | |
2139 | { | |
2140 | int i; | |
2141 | ||
2142 | for (i = 0; i < num_consumers; i++) { | |
2143 | regulator_put(consumers[i].consumer); | |
2144 | consumers[i].consumer = NULL; | |
2145 | } | |
2146 | } | |
2147 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2148 | ||
2149 | /** | |
2150 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2151 | * @rdev: regulator source |
414c70cb | 2152 | * @event: notifier block |
69279fb9 | 2153 | * @data: callback-specific data. |
414c70cb LG |
2154 | * |
2155 | * Called by regulator drivers to notify clients a regulator event has | |
2156 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2157 | * Note lock must be held by caller. |
414c70cb LG |
2158 | */ |
2159 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2160 | unsigned long event, void *data) | |
2161 | { | |
2162 | _notifier_call_chain(rdev, event, data); | |
2163 | return NOTIFY_DONE; | |
2164 | ||
2165 | } | |
2166 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2167 | ||
be721979 MB |
2168 | /** |
2169 | * regulator_mode_to_status - convert a regulator mode into a status | |
2170 | * | |
2171 | * @mode: Mode to convert | |
2172 | * | |
2173 | * Convert a regulator mode into a status. | |
2174 | */ | |
2175 | int regulator_mode_to_status(unsigned int mode) | |
2176 | { | |
2177 | switch (mode) { | |
2178 | case REGULATOR_MODE_FAST: | |
2179 | return REGULATOR_STATUS_FAST; | |
2180 | case REGULATOR_MODE_NORMAL: | |
2181 | return REGULATOR_STATUS_NORMAL; | |
2182 | case REGULATOR_MODE_IDLE: | |
2183 | return REGULATOR_STATUS_IDLE; | |
2184 | case REGULATOR_STATUS_STANDBY: | |
2185 | return REGULATOR_STATUS_STANDBY; | |
2186 | default: | |
2187 | return 0; | |
2188 | } | |
2189 | } | |
2190 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2191 | ||
7ad68e2f DB |
2192 | /* |
2193 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2194 | * create attributes that can be meaningfully displayed. | |
2195 | */ | |
2196 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2197 | { | |
2198 | struct device *dev = &rdev->dev; | |
2199 | struct regulator_ops *ops = rdev->desc->ops; | |
2200 | int status = 0; | |
2201 | ||
2202 | /* some attributes need specific methods to be displayed */ | |
476c2d83 | 2203 | if (ops->get_voltage || ops->get_voltage_sel) { |
7ad68e2f DB |
2204 | status = device_create_file(dev, &dev_attr_microvolts); |
2205 | if (status < 0) | |
2206 | return status; | |
2207 | } | |
2208 | if (ops->get_current_limit) { | |
2209 | status = device_create_file(dev, &dev_attr_microamps); | |
2210 | if (status < 0) | |
2211 | return status; | |
2212 | } | |
2213 | if (ops->get_mode) { | |
2214 | status = device_create_file(dev, &dev_attr_opmode); | |
2215 | if (status < 0) | |
2216 | return status; | |
2217 | } | |
2218 | if (ops->is_enabled) { | |
2219 | status = device_create_file(dev, &dev_attr_state); | |
2220 | if (status < 0) | |
2221 | return status; | |
2222 | } | |
853116a1 DB |
2223 | if (ops->get_status) { |
2224 | status = device_create_file(dev, &dev_attr_status); | |
2225 | if (status < 0) | |
2226 | return status; | |
2227 | } | |
7ad68e2f DB |
2228 | |
2229 | /* some attributes are type-specific */ | |
2230 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2231 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2232 | if (status < 0) | |
2233 | return status; | |
2234 | } | |
2235 | ||
2236 | /* all the other attributes exist to support constraints; | |
2237 | * don't show them if there are no constraints, or if the | |
2238 | * relevant supporting methods are missing. | |
2239 | */ | |
2240 | if (!rdev->constraints) | |
2241 | return status; | |
2242 | ||
2243 | /* constraints need specific supporting methods */ | |
2244 | if (ops->set_voltage) { | |
2245 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2246 | if (status < 0) | |
2247 | return status; | |
2248 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2249 | if (status < 0) | |
2250 | return status; | |
2251 | } | |
2252 | if (ops->set_current_limit) { | |
2253 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2254 | if (status < 0) | |
2255 | return status; | |
2256 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2257 | if (status < 0) | |
2258 | return status; | |
2259 | } | |
2260 | ||
2261 | /* suspend mode constraints need multiple supporting methods */ | |
2262 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2263 | return status; | |
2264 | ||
2265 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2266 | if (status < 0) | |
2267 | return status; | |
2268 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2269 | if (status < 0) | |
2270 | return status; | |
2271 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2272 | if (status < 0) | |
2273 | return status; | |
2274 | ||
2275 | if (ops->set_suspend_voltage) { | |
2276 | status = device_create_file(dev, | |
2277 | &dev_attr_suspend_standby_microvolts); | |
2278 | if (status < 0) | |
2279 | return status; | |
2280 | status = device_create_file(dev, | |
2281 | &dev_attr_suspend_mem_microvolts); | |
2282 | if (status < 0) | |
2283 | return status; | |
2284 | status = device_create_file(dev, | |
2285 | &dev_attr_suspend_disk_microvolts); | |
2286 | if (status < 0) | |
2287 | return status; | |
2288 | } | |
2289 | ||
2290 | if (ops->set_suspend_mode) { | |
2291 | status = device_create_file(dev, | |
2292 | &dev_attr_suspend_standby_mode); | |
2293 | if (status < 0) | |
2294 | return status; | |
2295 | status = device_create_file(dev, | |
2296 | &dev_attr_suspend_mem_mode); | |
2297 | if (status < 0) | |
2298 | return status; | |
2299 | status = device_create_file(dev, | |
2300 | &dev_attr_suspend_disk_mode); | |
2301 | if (status < 0) | |
2302 | return status; | |
2303 | } | |
2304 | ||
2305 | return status; | |
2306 | } | |
2307 | ||
414c70cb LG |
2308 | /** |
2309 | * regulator_register - register regulator | |
69279fb9 MB |
2310 | * @regulator_desc: regulator to register |
2311 | * @dev: struct device for the regulator | |
0527100f | 2312 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2313 | * @driver_data: private regulator data |
414c70cb LG |
2314 | * |
2315 | * Called by regulator drivers to register a regulator. | |
2316 | * Returns 0 on success. | |
2317 | */ | |
2318 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2319 | struct device *dev, const struct regulator_init_data *init_data, |
0527100f | 2320 | void *driver_data) |
414c70cb LG |
2321 | { |
2322 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2323 | struct regulator_dev *rdev; | |
a5766f11 | 2324 | int ret, i; |
414c70cb LG |
2325 | |
2326 | if (regulator_desc == NULL) | |
2327 | return ERR_PTR(-EINVAL); | |
2328 | ||
2329 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2330 | return ERR_PTR(-EINVAL); | |
2331 | ||
cd78dfc6 DL |
2332 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2333 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2334 | return ERR_PTR(-EINVAL); |
2335 | ||
46fabe1e MB |
2336 | if (!init_data) |
2337 | return ERR_PTR(-EINVAL); | |
2338 | ||
476c2d83 MB |
2339 | /* Only one of each should be implemented */ |
2340 | WARN_ON(regulator_desc->ops->get_voltage && | |
2341 | regulator_desc->ops->get_voltage_sel); | |
2342 | ||
2343 | /* If we're using selectors we must implement list_voltage. */ | |
2344 | if (regulator_desc->ops->get_voltage_sel && | |
2345 | !regulator_desc->ops->list_voltage) { | |
2346 | return ERR_PTR(-EINVAL); | |
2347 | } | |
2348 | ||
414c70cb LG |
2349 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2350 | if (rdev == NULL) | |
2351 | return ERR_PTR(-ENOMEM); | |
2352 | ||
2353 | mutex_lock(®ulator_list_mutex); | |
2354 | ||
2355 | mutex_init(&rdev->mutex); | |
a5766f11 | 2356 | rdev->reg_data = driver_data; |
414c70cb LG |
2357 | rdev->owner = regulator_desc->owner; |
2358 | rdev->desc = regulator_desc; | |
2359 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2360 | INIT_LIST_HEAD(&rdev->supply_list); | |
2361 | INIT_LIST_HEAD(&rdev->list); | |
2362 | INIT_LIST_HEAD(&rdev->slist); | |
2363 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2364 | ||
a5766f11 LG |
2365 | /* preform any regulator specific init */ |
2366 | if (init_data->regulator_init) { | |
2367 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2368 | if (ret < 0) |
2369 | goto clean; | |
a5766f11 LG |
2370 | } |
2371 | ||
a5766f11 | 2372 | /* register with sysfs */ |
414c70cb | 2373 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2374 | rdev->dev.parent = dev; |
812460a9 KS |
2375 | dev_set_name(&rdev->dev, "regulator.%d", |
2376 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2377 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2378 | if (ret != 0) { |
2379 | put_device(&rdev->dev); | |
4fca9545 | 2380 | goto clean; |
ad7725cb | 2381 | } |
a5766f11 LG |
2382 | |
2383 | dev_set_drvdata(&rdev->dev, rdev); | |
2384 | ||
74f544c1 MR |
2385 | /* set regulator constraints */ |
2386 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2387 | if (ret < 0) | |
2388 | goto scrub; | |
2389 | ||
7ad68e2f DB |
2390 | /* add attributes supported by this regulator */ |
2391 | ret = add_regulator_attributes(rdev); | |
2392 | if (ret < 0) | |
2393 | goto scrub; | |
2394 | ||
a5766f11 | 2395 | /* set supply regulator if it exists */ |
0178f3e2 MB |
2396 | if (init_data->supply_regulator && init_data->supply_regulator_dev) { |
2397 | dev_err(dev, | |
2398 | "Supply regulator specified by both name and dev\n"); | |
7727da22 | 2399 | ret = -EINVAL; |
0178f3e2 MB |
2400 | goto scrub; |
2401 | } | |
2402 | ||
2403 | if (init_data->supply_regulator) { | |
2404 | struct regulator_dev *r; | |
2405 | int found = 0; | |
2406 | ||
2407 | list_for_each_entry(r, ®ulator_list, list) { | |
2408 | if (strcmp(rdev_get_name(r), | |
2409 | init_data->supply_regulator) == 0) { | |
2410 | found = 1; | |
2411 | break; | |
2412 | } | |
2413 | } | |
2414 | ||
2415 | if (!found) { | |
2416 | dev_err(dev, "Failed to find supply %s\n", | |
2417 | init_data->supply_regulator); | |
7727da22 | 2418 | ret = -ENODEV; |
0178f3e2 MB |
2419 | goto scrub; |
2420 | } | |
2421 | ||
2422 | ret = set_supply(rdev, r); | |
2423 | if (ret < 0) | |
2424 | goto scrub; | |
2425 | } | |
2426 | ||
a5766f11 | 2427 | if (init_data->supply_regulator_dev) { |
0178f3e2 | 2428 | dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); |
a5766f11 LG |
2429 | ret = set_supply(rdev, |
2430 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2431 | if (ret < 0) |
2432 | goto scrub; | |
a5766f11 LG |
2433 | } |
2434 | ||
2435 | /* add consumers devices */ | |
2436 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2437 | ret = set_consumer_device_supply(rdev, | |
2438 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2439 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2440 | init_data->consumer_supplies[i].supply); |
d4033b54 JN |
2441 | if (ret < 0) |
2442 | goto unset_supplies; | |
414c70cb | 2443 | } |
a5766f11 LG |
2444 | |
2445 | list_add(&rdev->list, ®ulator_list); | |
2446 | out: | |
414c70cb LG |
2447 | mutex_unlock(®ulator_list_mutex); |
2448 | return rdev; | |
4fca9545 | 2449 | |
d4033b54 JN |
2450 | unset_supplies: |
2451 | unset_regulator_supplies(rdev); | |
2452 | ||
4fca9545 DB |
2453 | scrub: |
2454 | device_unregister(&rdev->dev); | |
53032daf PW |
2455 | /* device core frees rdev */ |
2456 | rdev = ERR_PTR(ret); | |
2457 | goto out; | |
2458 | ||
4fca9545 DB |
2459 | clean: |
2460 | kfree(rdev); | |
2461 | rdev = ERR_PTR(ret); | |
2462 | goto out; | |
414c70cb LG |
2463 | } |
2464 | EXPORT_SYMBOL_GPL(regulator_register); | |
2465 | ||
2466 | /** | |
2467 | * regulator_unregister - unregister regulator | |
69279fb9 | 2468 | * @rdev: regulator to unregister |
414c70cb LG |
2469 | * |
2470 | * Called by regulator drivers to unregister a regulator. | |
2471 | */ | |
2472 | void regulator_unregister(struct regulator_dev *rdev) | |
2473 | { | |
2474 | if (rdev == NULL) | |
2475 | return; | |
2476 | ||
2477 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2478 | WARN_ON(rdev->open_count); |
0f1d747b | 2479 | unset_regulator_supplies(rdev); |
414c70cb LG |
2480 | list_del(&rdev->list); |
2481 | if (rdev->supply) | |
2482 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2483 | device_unregister(&rdev->dev); | |
f8c12fe3 | 2484 | kfree(rdev->constraints); |
414c70cb LG |
2485 | mutex_unlock(®ulator_list_mutex); |
2486 | } | |
2487 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2488 | ||
414c70cb | 2489 | /** |
cf7bbcdf | 2490 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2491 | * @state: system suspend state |
2492 | * | |
2493 | * Configure each regulator with it's suspend operating parameters for state. | |
2494 | * This will usually be called by machine suspend code prior to supending. | |
2495 | */ | |
2496 | int regulator_suspend_prepare(suspend_state_t state) | |
2497 | { | |
2498 | struct regulator_dev *rdev; | |
2499 | int ret = 0; | |
2500 | ||
2501 | /* ON is handled by regulator active state */ | |
2502 | if (state == PM_SUSPEND_ON) | |
2503 | return -EINVAL; | |
2504 | ||
2505 | mutex_lock(®ulator_list_mutex); | |
2506 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2507 | ||
2508 | mutex_lock(&rdev->mutex); | |
2509 | ret = suspend_prepare(rdev, state); | |
2510 | mutex_unlock(&rdev->mutex); | |
2511 | ||
2512 | if (ret < 0) { | |
5da84fd9 | 2513 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2514 | goto out; |
2515 | } | |
2516 | } | |
2517 | out: | |
2518 | mutex_unlock(®ulator_list_mutex); | |
2519 | return ret; | |
2520 | } | |
2521 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2522 | ||
ca725561 MB |
2523 | /** |
2524 | * regulator_has_full_constraints - the system has fully specified constraints | |
2525 | * | |
2526 | * Calling this function will cause the regulator API to disable all | |
2527 | * regulators which have a zero use count and don't have an always_on | |
2528 | * constraint in a late_initcall. | |
2529 | * | |
2530 | * The intention is that this will become the default behaviour in a | |
2531 | * future kernel release so users are encouraged to use this facility | |
2532 | * now. | |
2533 | */ | |
2534 | void regulator_has_full_constraints(void) | |
2535 | { | |
2536 | has_full_constraints = 1; | |
2537 | } | |
2538 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2539 | ||
688fe99a MB |
2540 | /** |
2541 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2542 | * | |
2543 | * Calling this function will cause the regulator API to provide a | |
2544 | * dummy regulator to consumers if no physical regulator is found, | |
2545 | * allowing most consumers to proceed as though a regulator were | |
2546 | * configured. This allows systems such as those with software | |
2547 | * controllable regulators for the CPU core only to be brought up more | |
2548 | * readily. | |
2549 | */ | |
2550 | void regulator_use_dummy_regulator(void) | |
2551 | { | |
2552 | board_wants_dummy_regulator = true; | |
2553 | } | |
2554 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2555 | ||
414c70cb LG |
2556 | /** |
2557 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2558 | * @rdev: regulator |
414c70cb LG |
2559 | * |
2560 | * Get rdev regulator driver private data. This call can be used in the | |
2561 | * regulator driver context. | |
2562 | */ | |
2563 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2564 | { | |
2565 | return rdev->reg_data; | |
2566 | } | |
2567 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2568 | ||
2569 | /** | |
2570 | * regulator_get_drvdata - get regulator driver data | |
2571 | * @regulator: regulator | |
2572 | * | |
2573 | * Get regulator driver private data. This call can be used in the consumer | |
2574 | * driver context when non API regulator specific functions need to be called. | |
2575 | */ | |
2576 | void *regulator_get_drvdata(struct regulator *regulator) | |
2577 | { | |
2578 | return regulator->rdev->reg_data; | |
2579 | } | |
2580 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2581 | ||
2582 | /** | |
2583 | * regulator_set_drvdata - set regulator driver data | |
2584 | * @regulator: regulator | |
2585 | * @data: data | |
2586 | */ | |
2587 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2588 | { | |
2589 | regulator->rdev->reg_data = data; | |
2590 | } | |
2591 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2592 | ||
2593 | /** | |
2594 | * regulator_get_id - get regulator ID | |
69279fb9 | 2595 | * @rdev: regulator |
414c70cb LG |
2596 | */ |
2597 | int rdev_get_id(struct regulator_dev *rdev) | |
2598 | { | |
2599 | return rdev->desc->id; | |
2600 | } | |
2601 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2602 | ||
a5766f11 LG |
2603 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2604 | { | |
2605 | return &rdev->dev; | |
2606 | } | |
2607 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2608 | ||
2609 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2610 | { | |
2611 | return reg_init_data->driver_data; | |
2612 | } | |
2613 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2614 | ||
414c70cb LG |
2615 | static int __init regulator_init(void) |
2616 | { | |
34abbd68 MB |
2617 | int ret; |
2618 | ||
34abbd68 MB |
2619 | ret = class_register(®ulator_class); |
2620 | ||
2621 | regulator_dummy_init(); | |
2622 | ||
2623 | return ret; | |
414c70cb LG |
2624 | } |
2625 | ||
2626 | /* init early to allow our consumers to complete system booting */ | |
2627 | core_initcall(regulator_init); | |
ca725561 MB |
2628 | |
2629 | static int __init regulator_init_complete(void) | |
2630 | { | |
2631 | struct regulator_dev *rdev; | |
2632 | struct regulator_ops *ops; | |
2633 | struct regulation_constraints *c; | |
2634 | int enabled, ret; | |
ca725561 MB |
2635 | |
2636 | mutex_lock(®ulator_list_mutex); | |
2637 | ||
2638 | /* If we have a full configuration then disable any regulators | |
2639 | * which are not in use or always_on. This will become the | |
2640 | * default behaviour in the future. | |
2641 | */ | |
2642 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2643 | ops = rdev->desc->ops; | |
2644 | c = rdev->constraints; | |
2645 | ||
f25e0b4f | 2646 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2647 | continue; |
2648 | ||
2649 | mutex_lock(&rdev->mutex); | |
2650 | ||
2651 | if (rdev->use_count) | |
2652 | goto unlock; | |
2653 | ||
2654 | /* If we can't read the status assume it's on. */ | |
2655 | if (ops->is_enabled) | |
2656 | enabled = ops->is_enabled(rdev); | |
2657 | else | |
2658 | enabled = 1; | |
2659 | ||
2660 | if (!enabled) | |
2661 | goto unlock; | |
2662 | ||
2663 | if (has_full_constraints) { | |
2664 | /* We log since this may kill the system if it | |
2665 | * goes wrong. */ | |
5da84fd9 | 2666 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
2667 | ret = ops->disable(rdev); |
2668 | if (ret != 0) { | |
5da84fd9 | 2669 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
2670 | } |
2671 | } else { | |
2672 | /* The intention is that in future we will | |
2673 | * assume that full constraints are provided | |
2674 | * so warn even if we aren't going to do | |
2675 | * anything here. | |
2676 | */ | |
5da84fd9 | 2677 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
2678 | } |
2679 | ||
2680 | unlock: | |
2681 | mutex_unlock(&rdev->mutex); | |
2682 | } | |
2683 | ||
2684 | mutex_unlock(®ulator_list_mutex); | |
2685 | ||
2686 | return 0; | |
2687 | } | |
2688 | late_initcall(regulator_init_complete); |