]>
Commit | Line | Data |
---|---|---|
414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
1d7372e1 | 16 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
c5e28ed7 | 17 | |
414c70cb LG |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
1130e5b3 | 20 | #include <linux/debugfs.h> |
414c70cb | 21 | #include <linux/device.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
f21e0e81 | 23 | #include <linux/async.h> |
414c70cb LG |
24 | #include <linux/err.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/suspend.h> | |
31aae2be | 27 | #include <linux/delay.h> |
414c70cb LG |
28 | #include <linux/regulator/consumer.h> |
29 | #include <linux/regulator/driver.h> | |
30 | #include <linux/regulator/machine.h> | |
31 | ||
02fa3ec0 MB |
32 | #define CREATE_TRACE_POINTS |
33 | #include <trace/events/regulator.h> | |
34 | ||
34abbd68 MB |
35 | #include "dummy.h" |
36 | ||
5da84fd9 JP |
37 | #define rdev_err(rdev, fmt, ...) \ |
38 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
39 | #define rdev_warn(rdev, fmt, ...) \ | |
40 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
41 | #define rdev_info(rdev, fmt, ...) \ | |
42 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | #define rdev_dbg(rdev, fmt, ...) \ | |
44 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | ||
414c70cb LG |
46 | static DEFINE_MUTEX(regulator_list_mutex); |
47 | static LIST_HEAD(regulator_list); | |
48 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 49 | static bool has_full_constraints; |
688fe99a | 50 | static bool board_wants_dummy_regulator; |
414c70cb | 51 | |
1130e5b3 MB |
52 | #ifdef CONFIG_DEBUG_FS |
53 | static struct dentry *debugfs_root; | |
54 | #endif | |
55 | ||
8dc5390d | 56 | /* |
414c70cb LG |
57 | * struct regulator_map |
58 | * | |
59 | * Used to provide symbolic supply names to devices. | |
60 | */ | |
61 | struct regulator_map { | |
62 | struct list_head list; | |
40f9244f | 63 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 64 | const char *supply; |
a5766f11 | 65 | struct regulator_dev *regulator; |
414c70cb LG |
66 | }; |
67 | ||
414c70cb LG |
68 | /* |
69 | * struct regulator | |
70 | * | |
71 | * One for each consumer device. | |
72 | */ | |
73 | struct regulator { | |
74 | struct device *dev; | |
75 | struct list_head list; | |
76 | int uA_load; | |
77 | int min_uV; | |
78 | int max_uV; | |
414c70cb LG |
79 | char *supply_name; |
80 | struct device_attribute dev_attr; | |
81 | struct regulator_dev *rdev; | |
82 | }; | |
83 | ||
84 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
8cbf811d JC |
85 | static int _regulator_disable(struct regulator_dev *rdev, |
86 | struct regulator_dev **supply_rdev_ptr); | |
414c70cb LG |
87 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
88 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
89 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
90 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
91 | unsigned long event, void *data); | |
75790251 MB |
92 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
93 | int min_uV, int max_uV); | |
414c70cb | 94 | |
1083c393 MB |
95 | static const char *rdev_get_name(struct regulator_dev *rdev) |
96 | { | |
97 | if (rdev->constraints && rdev->constraints->name) | |
98 | return rdev->constraints->name; | |
99 | else if (rdev->desc->name) | |
100 | return rdev->desc->name; | |
101 | else | |
102 | return ""; | |
103 | } | |
104 | ||
414c70cb LG |
105 | /* gets the regulator for a given consumer device */ |
106 | static struct regulator *get_device_regulator(struct device *dev) | |
107 | { | |
108 | struct regulator *regulator = NULL; | |
109 | struct regulator_dev *rdev; | |
110 | ||
111 | mutex_lock(®ulator_list_mutex); | |
112 | list_for_each_entry(rdev, ®ulator_list, list) { | |
113 | mutex_lock(&rdev->mutex); | |
114 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
115 | if (regulator->dev == dev) { | |
116 | mutex_unlock(&rdev->mutex); | |
117 | mutex_unlock(®ulator_list_mutex); | |
118 | return regulator; | |
119 | } | |
120 | } | |
121 | mutex_unlock(&rdev->mutex); | |
122 | } | |
123 | mutex_unlock(®ulator_list_mutex); | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | /* Platform voltage constraint check */ | |
128 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
129 | int *min_uV, int *max_uV) | |
130 | { | |
131 | BUG_ON(*min_uV > *max_uV); | |
132 | ||
133 | if (!rdev->constraints) { | |
5da84fd9 | 134 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
135 | return -ENODEV; |
136 | } | |
137 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 138 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
139 | return -EPERM; |
140 | } | |
141 | ||
142 | if (*max_uV > rdev->constraints->max_uV) | |
143 | *max_uV = rdev->constraints->max_uV; | |
144 | if (*min_uV < rdev->constraints->min_uV) | |
145 | *min_uV = rdev->constraints->min_uV; | |
146 | ||
147 | if (*min_uV > *max_uV) | |
148 | return -EINVAL; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
05fda3b1 TP |
153 | /* Make sure we select a voltage that suits the needs of all |
154 | * regulator consumers | |
155 | */ | |
156 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
157 | int *min_uV, int *max_uV) | |
158 | { | |
159 | struct regulator *regulator; | |
160 | ||
161 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
162 | /* |
163 | * Assume consumers that didn't say anything are OK | |
164 | * with anything in the constraint range. | |
165 | */ | |
166 | if (!regulator->min_uV && !regulator->max_uV) | |
167 | continue; | |
168 | ||
05fda3b1 TP |
169 | if (*max_uV > regulator->max_uV) |
170 | *max_uV = regulator->max_uV; | |
171 | if (*min_uV < regulator->min_uV) | |
172 | *min_uV = regulator->min_uV; | |
173 | } | |
174 | ||
175 | if (*min_uV > *max_uV) | |
176 | return -EINVAL; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
414c70cb LG |
181 | /* current constraint check */ |
182 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
183 | int *min_uA, int *max_uA) | |
184 | { | |
185 | BUG_ON(*min_uA > *max_uA); | |
186 | ||
187 | if (!rdev->constraints) { | |
5da84fd9 | 188 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
189 | return -ENODEV; |
190 | } | |
191 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 192 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
193 | return -EPERM; |
194 | } | |
195 | ||
196 | if (*max_uA > rdev->constraints->max_uA) | |
197 | *max_uA = rdev->constraints->max_uA; | |
198 | if (*min_uA < rdev->constraints->min_uA) | |
199 | *min_uA = rdev->constraints->min_uA; | |
200 | ||
201 | if (*min_uA > *max_uA) | |
202 | return -EINVAL; | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | /* operating mode constraint check */ | |
2c608234 | 208 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 209 | { |
2c608234 | 210 | switch (*mode) { |
e573520b DB |
211 | case REGULATOR_MODE_FAST: |
212 | case REGULATOR_MODE_NORMAL: | |
213 | case REGULATOR_MODE_IDLE: | |
214 | case REGULATOR_MODE_STANDBY: | |
215 | break; | |
216 | default: | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
414c70cb | 220 | if (!rdev->constraints) { |
5da84fd9 | 221 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
222 | return -ENODEV; |
223 | } | |
224 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 225 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
226 | return -EPERM; |
227 | } | |
2c608234 MB |
228 | |
229 | /* The modes are bitmasks, the most power hungry modes having | |
230 | * the lowest values. If the requested mode isn't supported | |
231 | * try higher modes. */ | |
232 | while (*mode) { | |
233 | if (rdev->constraints->valid_modes_mask & *mode) | |
234 | return 0; | |
235 | *mode /= 2; | |
414c70cb | 236 | } |
2c608234 MB |
237 | |
238 | return -EINVAL; | |
414c70cb LG |
239 | } |
240 | ||
241 | /* dynamic regulator mode switching constraint check */ | |
242 | static int regulator_check_drms(struct regulator_dev *rdev) | |
243 | { | |
244 | if (!rdev->constraints) { | |
5da84fd9 | 245 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
246 | return -ENODEV; |
247 | } | |
248 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 249 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
250 | return -EPERM; |
251 | } | |
252 | return 0; | |
253 | } | |
254 | ||
255 | static ssize_t device_requested_uA_show(struct device *dev, | |
256 | struct device_attribute *attr, char *buf) | |
257 | { | |
258 | struct regulator *regulator; | |
259 | ||
260 | regulator = get_device_regulator(dev); | |
261 | if (regulator == NULL) | |
262 | return 0; | |
263 | ||
264 | return sprintf(buf, "%d\n", regulator->uA_load); | |
265 | } | |
266 | ||
267 | static ssize_t regulator_uV_show(struct device *dev, | |
268 | struct device_attribute *attr, char *buf) | |
269 | { | |
a5766f11 | 270 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
271 | ssize_t ret; |
272 | ||
273 | mutex_lock(&rdev->mutex); | |
274 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
275 | mutex_unlock(&rdev->mutex); | |
276 | ||
277 | return ret; | |
278 | } | |
7ad68e2f | 279 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
280 | |
281 | static ssize_t regulator_uA_show(struct device *dev, | |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
a5766f11 | 284 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
285 | |
286 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
287 | } | |
7ad68e2f | 288 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 289 | |
bc558a60 MB |
290 | static ssize_t regulator_name_show(struct device *dev, |
291 | struct device_attribute *attr, char *buf) | |
292 | { | |
293 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 294 | |
1083c393 | 295 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
296 | } |
297 | ||
4fca9545 | 298 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 299 | { |
414c70cb LG |
300 | switch (mode) { |
301 | case REGULATOR_MODE_FAST: | |
302 | return sprintf(buf, "fast\n"); | |
303 | case REGULATOR_MODE_NORMAL: | |
304 | return sprintf(buf, "normal\n"); | |
305 | case REGULATOR_MODE_IDLE: | |
306 | return sprintf(buf, "idle\n"); | |
307 | case REGULATOR_MODE_STANDBY: | |
308 | return sprintf(buf, "standby\n"); | |
309 | } | |
310 | return sprintf(buf, "unknown\n"); | |
311 | } | |
312 | ||
4fca9545 DB |
313 | static ssize_t regulator_opmode_show(struct device *dev, |
314 | struct device_attribute *attr, char *buf) | |
414c70cb | 315 | { |
a5766f11 | 316 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 317 | |
4fca9545 DB |
318 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
319 | } | |
7ad68e2f | 320 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
321 | |
322 | static ssize_t regulator_print_state(char *buf, int state) | |
323 | { | |
414c70cb LG |
324 | if (state > 0) |
325 | return sprintf(buf, "enabled\n"); | |
326 | else if (state == 0) | |
327 | return sprintf(buf, "disabled\n"); | |
328 | else | |
329 | return sprintf(buf, "unknown\n"); | |
330 | } | |
331 | ||
4fca9545 DB |
332 | static ssize_t regulator_state_show(struct device *dev, |
333 | struct device_attribute *attr, char *buf) | |
334 | { | |
335 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
336 | ssize_t ret; |
337 | ||
338 | mutex_lock(&rdev->mutex); | |
339 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
340 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 341 | |
9332546f | 342 | return ret; |
4fca9545 | 343 | } |
7ad68e2f | 344 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 345 | |
853116a1 DB |
346 | static ssize_t regulator_status_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) | |
348 | { | |
349 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
350 | int status; | |
351 | char *label; | |
352 | ||
353 | status = rdev->desc->ops->get_status(rdev); | |
354 | if (status < 0) | |
355 | return status; | |
356 | ||
357 | switch (status) { | |
358 | case REGULATOR_STATUS_OFF: | |
359 | label = "off"; | |
360 | break; | |
361 | case REGULATOR_STATUS_ON: | |
362 | label = "on"; | |
363 | break; | |
364 | case REGULATOR_STATUS_ERROR: | |
365 | label = "error"; | |
366 | break; | |
367 | case REGULATOR_STATUS_FAST: | |
368 | label = "fast"; | |
369 | break; | |
370 | case REGULATOR_STATUS_NORMAL: | |
371 | label = "normal"; | |
372 | break; | |
373 | case REGULATOR_STATUS_IDLE: | |
374 | label = "idle"; | |
375 | break; | |
376 | case REGULATOR_STATUS_STANDBY: | |
377 | label = "standby"; | |
378 | break; | |
379 | default: | |
380 | return -ERANGE; | |
381 | } | |
382 | ||
383 | return sprintf(buf, "%s\n", label); | |
384 | } | |
385 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
386 | ||
414c70cb LG |
387 | static ssize_t regulator_min_uA_show(struct device *dev, |
388 | struct device_attribute *attr, char *buf) | |
389 | { | |
a5766f11 | 390 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
391 | |
392 | if (!rdev->constraints) | |
393 | return sprintf(buf, "constraint not defined\n"); | |
394 | ||
395 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
396 | } | |
7ad68e2f | 397 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
398 | |
399 | static ssize_t regulator_max_uA_show(struct device *dev, | |
400 | struct device_attribute *attr, char *buf) | |
401 | { | |
a5766f11 | 402 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
403 | |
404 | if (!rdev->constraints) | |
405 | return sprintf(buf, "constraint not defined\n"); | |
406 | ||
407 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
408 | } | |
7ad68e2f | 409 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
410 | |
411 | static ssize_t regulator_min_uV_show(struct device *dev, | |
412 | struct device_attribute *attr, char *buf) | |
413 | { | |
a5766f11 | 414 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
415 | |
416 | if (!rdev->constraints) | |
417 | return sprintf(buf, "constraint not defined\n"); | |
418 | ||
419 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
420 | } | |
7ad68e2f | 421 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
422 | |
423 | static ssize_t regulator_max_uV_show(struct device *dev, | |
424 | struct device_attribute *attr, char *buf) | |
425 | { | |
a5766f11 | 426 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
427 | |
428 | if (!rdev->constraints) | |
429 | return sprintf(buf, "constraint not defined\n"); | |
430 | ||
431 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
432 | } | |
7ad68e2f | 433 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
434 | |
435 | static ssize_t regulator_total_uA_show(struct device *dev, | |
436 | struct device_attribute *attr, char *buf) | |
437 | { | |
a5766f11 | 438 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
439 | struct regulator *regulator; |
440 | int uA = 0; | |
441 | ||
442 | mutex_lock(&rdev->mutex); | |
443 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 444 | uA += regulator->uA_load; |
414c70cb LG |
445 | mutex_unlock(&rdev->mutex); |
446 | return sprintf(buf, "%d\n", uA); | |
447 | } | |
7ad68e2f | 448 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
449 | |
450 | static ssize_t regulator_num_users_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
454 | return sprintf(buf, "%d\n", rdev->use_count); |
455 | } | |
456 | ||
457 | static ssize_t regulator_type_show(struct device *dev, | |
458 | struct device_attribute *attr, char *buf) | |
459 | { | |
a5766f11 | 460 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
461 | |
462 | switch (rdev->desc->type) { | |
463 | case REGULATOR_VOLTAGE: | |
464 | return sprintf(buf, "voltage\n"); | |
465 | case REGULATOR_CURRENT: | |
466 | return sprintf(buf, "current\n"); | |
467 | } | |
468 | return sprintf(buf, "unknown\n"); | |
469 | } | |
470 | ||
471 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
472 | struct device_attribute *attr, char *buf) | |
473 | { | |
a5766f11 | 474 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 475 | |
414c70cb LG |
476 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
477 | } | |
7ad68e2f DB |
478 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
479 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
480 | |
481 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
482 | struct device_attribute *attr, char *buf) | |
483 | { | |
a5766f11 | 484 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 485 | |
414c70cb LG |
486 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
487 | } | |
7ad68e2f DB |
488 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
489 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
490 | |
491 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
492 | struct device_attribute *attr, char *buf) | |
493 | { | |
a5766f11 | 494 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 495 | |
414c70cb LG |
496 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
497 | } | |
7ad68e2f DB |
498 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
499 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 500 | |
414c70cb LG |
501 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
502 | struct device_attribute *attr, char *buf) | |
503 | { | |
a5766f11 | 504 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 505 | |
4fca9545 DB |
506 | return regulator_print_opmode(buf, |
507 | rdev->constraints->state_mem.mode); | |
414c70cb | 508 | } |
7ad68e2f DB |
509 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
510 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
511 | |
512 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
513 | struct device_attribute *attr, char *buf) | |
514 | { | |
a5766f11 | 515 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 516 | |
4fca9545 DB |
517 | return regulator_print_opmode(buf, |
518 | rdev->constraints->state_disk.mode); | |
414c70cb | 519 | } |
7ad68e2f DB |
520 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
521 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
522 | |
523 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
524 | struct device_attribute *attr, char *buf) | |
525 | { | |
a5766f11 | 526 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 527 | |
4fca9545 DB |
528 | return regulator_print_opmode(buf, |
529 | rdev->constraints->state_standby.mode); | |
414c70cb | 530 | } |
7ad68e2f DB |
531 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
532 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
533 | |
534 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
535 | struct device_attribute *attr, char *buf) | |
536 | { | |
a5766f11 | 537 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 538 | |
4fca9545 DB |
539 | return regulator_print_state(buf, |
540 | rdev->constraints->state_mem.enabled); | |
414c70cb | 541 | } |
7ad68e2f DB |
542 | static DEVICE_ATTR(suspend_mem_state, 0444, |
543 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
544 | |
545 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
546 | struct device_attribute *attr, char *buf) | |
547 | { | |
a5766f11 | 548 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 549 | |
4fca9545 DB |
550 | return regulator_print_state(buf, |
551 | rdev->constraints->state_disk.enabled); | |
414c70cb | 552 | } |
7ad68e2f DB |
553 | static DEVICE_ATTR(suspend_disk_state, 0444, |
554 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
555 | |
556 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
557 | struct device_attribute *attr, char *buf) | |
558 | { | |
a5766f11 | 559 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 560 | |
4fca9545 DB |
561 | return regulator_print_state(buf, |
562 | rdev->constraints->state_standby.enabled); | |
414c70cb | 563 | } |
7ad68e2f DB |
564 | static DEVICE_ATTR(suspend_standby_state, 0444, |
565 | regulator_suspend_standby_state_show, NULL); | |
566 | ||
bc558a60 | 567 | |
7ad68e2f DB |
568 | /* |
569 | * These are the only attributes are present for all regulators. | |
570 | * Other attributes are a function of regulator functionality. | |
571 | */ | |
414c70cb | 572 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 573 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
574 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
575 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
576 | __ATTR_NULL, |
577 | }; | |
578 | ||
579 | static void regulator_dev_release(struct device *dev) | |
580 | { | |
a5766f11 | 581 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
582 | kfree(rdev); |
583 | } | |
584 | ||
585 | static struct class regulator_class = { | |
586 | .name = "regulator", | |
587 | .dev_release = regulator_dev_release, | |
588 | .dev_attrs = regulator_dev_attrs, | |
589 | }; | |
590 | ||
591 | /* Calculate the new optimum regulator operating mode based on the new total | |
592 | * consumer load. All locks held by caller */ | |
593 | static void drms_uA_update(struct regulator_dev *rdev) | |
594 | { | |
595 | struct regulator *sibling; | |
596 | int current_uA = 0, output_uV, input_uV, err; | |
597 | unsigned int mode; | |
598 | ||
599 | err = regulator_check_drms(rdev); | |
600 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
601 | (!rdev->desc->ops->get_voltage && |
602 | !rdev->desc->ops->get_voltage_sel) || | |
603 | !rdev->desc->ops->set_mode) | |
036de8ef | 604 | return; |
414c70cb LG |
605 | |
606 | /* get output voltage */ | |
1bf5a1f8 | 607 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
608 | if (output_uV <= 0) |
609 | return; | |
610 | ||
611 | /* get input voltage */ | |
1bf5a1f8 MB |
612 | input_uV = 0; |
613 | if (rdev->supply) | |
614 | input_uV = _regulator_get_voltage(rdev); | |
615 | if (input_uV <= 0) | |
414c70cb LG |
616 | input_uV = rdev->constraints->input_uV; |
617 | if (input_uV <= 0) | |
618 | return; | |
619 | ||
620 | /* calc total requested load */ | |
621 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 622 | current_uA += sibling->uA_load; |
414c70cb LG |
623 | |
624 | /* now get the optimum mode for our new total regulator load */ | |
625 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
626 | output_uV, current_uA); | |
627 | ||
628 | /* check the new mode is allowed */ | |
2c608234 | 629 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
630 | if (err == 0) |
631 | rdev->desc->ops->set_mode(rdev, mode); | |
632 | } | |
633 | ||
634 | static int suspend_set_state(struct regulator_dev *rdev, | |
635 | struct regulator_state *rstate) | |
636 | { | |
637 | int ret = 0; | |
638f85c5 MB |
638 | bool can_set_state; |
639 | ||
640 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
641 | rdev->desc->ops->set_suspend_disable; | |
642 | ||
643 | /* If we have no suspend mode configration don't set anything; | |
644 | * only warn if the driver actually makes the suspend mode | |
645 | * configurable. | |
646 | */ | |
647 | if (!rstate->enabled && !rstate->disabled) { | |
648 | if (can_set_state) | |
5da84fd9 | 649 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
650 | return 0; |
651 | } | |
652 | ||
653 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 654 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
655 | return -EINVAL; |
656 | } | |
414c70cb | 657 | |
638f85c5 | 658 | if (!can_set_state) { |
5da84fd9 | 659 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 660 | return -EINVAL; |
a5766f11 | 661 | } |
414c70cb LG |
662 | |
663 | if (rstate->enabled) | |
664 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
665 | else | |
666 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
667 | if (ret < 0) { | |
5da84fd9 | 668 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
669 | return ret; |
670 | } | |
671 | ||
672 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
673 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
674 | if (ret < 0) { | |
5da84fd9 | 675 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
676 | return ret; |
677 | } | |
678 | } | |
679 | ||
680 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
681 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
682 | if (ret < 0) { | |
5da84fd9 | 683 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
684 | return ret; |
685 | } | |
686 | } | |
687 | return ret; | |
688 | } | |
689 | ||
690 | /* locks held by caller */ | |
691 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
692 | { | |
693 | if (!rdev->constraints) | |
694 | return -EINVAL; | |
695 | ||
696 | switch (state) { | |
697 | case PM_SUSPEND_STANDBY: | |
698 | return suspend_set_state(rdev, | |
699 | &rdev->constraints->state_standby); | |
700 | case PM_SUSPEND_MEM: | |
701 | return suspend_set_state(rdev, | |
702 | &rdev->constraints->state_mem); | |
703 | case PM_SUSPEND_MAX: | |
704 | return suspend_set_state(rdev, | |
705 | &rdev->constraints->state_disk); | |
706 | default: | |
707 | return -EINVAL; | |
708 | } | |
709 | } | |
710 | ||
711 | static void print_constraints(struct regulator_dev *rdev) | |
712 | { | |
713 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 714 | char buf[80] = ""; |
8f031b48 MB |
715 | int count = 0; |
716 | int ret; | |
414c70cb | 717 | |
8f031b48 | 718 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 719 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
720 | count += sprintf(buf + count, "%d mV ", |
721 | constraints->min_uV / 1000); | |
414c70cb | 722 | else |
8f031b48 MB |
723 | count += sprintf(buf + count, "%d <--> %d mV ", |
724 | constraints->min_uV / 1000, | |
725 | constraints->max_uV / 1000); | |
726 | } | |
727 | ||
728 | if (!constraints->min_uV || | |
729 | constraints->min_uV != constraints->max_uV) { | |
730 | ret = _regulator_get_voltage(rdev); | |
731 | if (ret > 0) | |
732 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
733 | } | |
734 | ||
bf5892a8 MB |
735 | if (constraints->uV_offset) |
736 | count += sprintf(buf, "%dmV offset ", | |
737 | constraints->uV_offset / 1000); | |
738 | ||
8f031b48 | 739 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 740 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
741 | count += sprintf(buf + count, "%d mA ", |
742 | constraints->min_uA / 1000); | |
414c70cb | 743 | else |
8f031b48 MB |
744 | count += sprintf(buf + count, "%d <--> %d mA ", |
745 | constraints->min_uA / 1000, | |
746 | constraints->max_uA / 1000); | |
747 | } | |
748 | ||
749 | if (!constraints->min_uA || | |
750 | constraints->min_uA != constraints->max_uA) { | |
751 | ret = _regulator_get_current_limit(rdev); | |
752 | if (ret > 0) | |
e4a6376b | 753 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 754 | } |
8f031b48 | 755 | |
414c70cb LG |
756 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
757 | count += sprintf(buf + count, "fast "); | |
758 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
759 | count += sprintf(buf + count, "normal "); | |
760 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
761 | count += sprintf(buf + count, "idle "); | |
762 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
763 | count += sprintf(buf + count, "standby"); | |
764 | ||
13ce29f8 | 765 | rdev_info(rdev, "%s\n", buf); |
414c70cb LG |
766 | } |
767 | ||
e79055d6 | 768 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 769 | struct regulation_constraints *constraints) |
a5766f11 | 770 | { |
e5fda26c | 771 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
772 | int ret; |
773 | ||
774 | /* do we need to apply the constraint voltage */ | |
775 | if (rdev->constraints->apply_uV && | |
75790251 MB |
776 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
777 | ret = _regulator_do_set_voltage(rdev, | |
778 | rdev->constraints->min_uV, | |
779 | rdev->constraints->max_uV); | |
780 | if (ret < 0) { | |
781 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
782 | rdev->constraints->min_uV); | |
783 | rdev->constraints = NULL; | |
784 | return ret; | |
785 | } | |
af5866c9 | 786 | } |
e06f5b4f | 787 | |
4367cfdc DB |
788 | /* constrain machine-level voltage specs to fit |
789 | * the actual range supported by this regulator. | |
790 | */ | |
791 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
792 | int count = rdev->desc->n_voltages; | |
793 | int i; | |
794 | int min_uV = INT_MAX; | |
795 | int max_uV = INT_MIN; | |
796 | int cmin = constraints->min_uV; | |
797 | int cmax = constraints->max_uV; | |
798 | ||
3e590918 MB |
799 | /* it's safe to autoconfigure fixed-voltage supplies |
800 | and the constraints are used by list_voltage. */ | |
4367cfdc | 801 | if (count == 1 && !cmin) { |
3e590918 | 802 | cmin = 1; |
4367cfdc | 803 | cmax = INT_MAX; |
3e590918 MB |
804 | constraints->min_uV = cmin; |
805 | constraints->max_uV = cmax; | |
4367cfdc DB |
806 | } |
807 | ||
3e2b9abd MB |
808 | /* voltage constraints are optional */ |
809 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 810 | return 0; |
3e2b9abd | 811 | |
4367cfdc | 812 | /* else require explicit machine-level constraints */ |
3e2b9abd | 813 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 814 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 815 | return -EINVAL; |
4367cfdc DB |
816 | } |
817 | ||
818 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
819 | for (i = 0; i < count; i++) { | |
820 | int value; | |
821 | ||
822 | value = ops->list_voltage(rdev, i); | |
823 | if (value <= 0) | |
824 | continue; | |
825 | ||
826 | /* maybe adjust [min_uV..max_uV] */ | |
827 | if (value >= cmin && value < min_uV) | |
828 | min_uV = value; | |
829 | if (value <= cmax && value > max_uV) | |
830 | max_uV = value; | |
831 | } | |
832 | ||
833 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
834 | if (max_uV < min_uV) { | |
5da84fd9 | 835 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 836 | return -EINVAL; |
4367cfdc DB |
837 | } |
838 | ||
839 | /* use regulator's subset of machine constraints */ | |
840 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
841 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
842 | constraints->min_uV, min_uV); | |
4367cfdc DB |
843 | constraints->min_uV = min_uV; |
844 | } | |
845 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
846 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
847 | constraints->max_uV, max_uV); | |
4367cfdc DB |
848 | constraints->max_uV = max_uV; |
849 | } | |
850 | } | |
851 | ||
e79055d6 MB |
852 | return 0; |
853 | } | |
854 | ||
855 | /** | |
856 | * set_machine_constraints - sets regulator constraints | |
857 | * @rdev: regulator source | |
858 | * @constraints: constraints to apply | |
859 | * | |
860 | * Allows platform initialisation code to define and constrain | |
861 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
862 | * Constraints *must* be set by platform code in order for some | |
863 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
864 | * set_mode. | |
865 | */ | |
866 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 867 | const struct regulation_constraints *constraints) |
e79055d6 MB |
868 | { |
869 | int ret = 0; | |
e79055d6 MB |
870 | struct regulator_ops *ops = rdev->desc->ops; |
871 | ||
f8c12fe3 MB |
872 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
873 | GFP_KERNEL); | |
874 | if (!rdev->constraints) | |
875 | return -ENOMEM; | |
af5866c9 | 876 | |
f8c12fe3 | 877 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
878 | if (ret != 0) |
879 | goto out; | |
880 | ||
a5766f11 | 881 | /* do we need to setup our suspend state */ |
e06f5b4f | 882 | if (constraints->initial_state) { |
f8c12fe3 | 883 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 884 | if (ret < 0) { |
5da84fd9 | 885 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
886 | rdev->constraints = NULL; |
887 | goto out; | |
888 | } | |
889 | } | |
a5766f11 | 890 | |
a308466c MB |
891 | if (constraints->initial_mode) { |
892 | if (!ops->set_mode) { | |
5da84fd9 | 893 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
894 | ret = -EINVAL; |
895 | goto out; | |
896 | } | |
897 | ||
f8c12fe3 | 898 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 899 | if (ret < 0) { |
5da84fd9 | 900 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
901 | goto out; |
902 | } | |
903 | } | |
904 | ||
cacf90f2 MB |
905 | /* If the constraints say the regulator should be on at this point |
906 | * and we have control then make sure it is enabled. | |
907 | */ | |
f8c12fe3 MB |
908 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
909 | ops->enable) { | |
e5fda26c MB |
910 | ret = ops->enable(rdev); |
911 | if (ret < 0) { | |
5da84fd9 | 912 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
913 | rdev->constraints = NULL; |
914 | goto out; | |
915 | } | |
916 | } | |
917 | ||
a5766f11 LG |
918 | print_constraints(rdev); |
919 | out: | |
920 | return ret; | |
921 | } | |
922 | ||
923 | /** | |
924 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
925 | * @rdev: regulator name |
926 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
927 | * |
928 | * Called by platform initialisation code to set the supply regulator for this | |
929 | * regulator. This ensures that a regulators supply will also be enabled by the | |
930 | * core if it's child is enabled. | |
931 | */ | |
932 | static int set_supply(struct regulator_dev *rdev, | |
933 | struct regulator_dev *supply_rdev) | |
934 | { | |
935 | int err; | |
936 | ||
937 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
938 | "supply"); | |
939 | if (err) { | |
5da84fd9 JP |
940 | rdev_err(rdev, "could not add device link %s err %d\n", |
941 | supply_rdev->dev.kobj.name, err); | |
a5766f11 LG |
942 | goto out; |
943 | } | |
944 | rdev->supply = supply_rdev; | |
945 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
946 | out: | |
947 | return err; | |
948 | } | |
949 | ||
950 | /** | |
06c63f93 | 951 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
952 | * @rdev: regulator source |
953 | * @consumer_dev: device the supply applies to | |
40f9244f | 954 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 955 | * @supply: symbolic name for supply |
a5766f11 LG |
956 | * |
957 | * Allows platform initialisation code to map physical regulator | |
958 | * sources to symbolic names for supplies for use by devices. Devices | |
959 | * should use these symbolic names to request regulators, avoiding the | |
960 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
961 | * |
962 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
963 | */ |
964 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
965 | struct device *consumer_dev, const char *consumer_dev_name, |
966 | const char *supply) | |
a5766f11 LG |
967 | { |
968 | struct regulator_map *node; | |
9ed2099e | 969 | int has_dev; |
a5766f11 | 970 | |
40f9244f MB |
971 | if (consumer_dev && consumer_dev_name) |
972 | return -EINVAL; | |
973 | ||
974 | if (!consumer_dev_name && consumer_dev) | |
975 | consumer_dev_name = dev_name(consumer_dev); | |
976 | ||
a5766f11 LG |
977 | if (supply == NULL) |
978 | return -EINVAL; | |
979 | ||
9ed2099e MB |
980 | if (consumer_dev_name != NULL) |
981 | has_dev = 1; | |
982 | else | |
983 | has_dev = 0; | |
984 | ||
6001e13c | 985 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
986 | if (node->dev_name && consumer_dev_name) { |
987 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
988 | continue; | |
989 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 990 | continue; |
23b5cc2a JN |
991 | } |
992 | ||
6001e13c DB |
993 | if (strcmp(node->supply, supply) != 0) |
994 | continue; | |
995 | ||
996 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
997 | dev_name(&node->regulator->dev), |
998 | node->regulator->desc->name, | |
999 | supply, | |
1000 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1001 | return -EBUSY; |
1002 | } | |
1003 | ||
9ed2099e | 1004 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1005 | if (node == NULL) |
1006 | return -ENOMEM; | |
1007 | ||
1008 | node->regulator = rdev; | |
a5766f11 LG |
1009 | node->supply = supply; |
1010 | ||
9ed2099e MB |
1011 | if (has_dev) { |
1012 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1013 | if (node->dev_name == NULL) { | |
1014 | kfree(node); | |
1015 | return -ENOMEM; | |
1016 | } | |
40f9244f MB |
1017 | } |
1018 | ||
a5766f11 LG |
1019 | list_add(&node->list, ®ulator_map_list); |
1020 | return 0; | |
1021 | } | |
1022 | ||
0f1d747b MR |
1023 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1024 | { | |
1025 | struct regulator_map *node, *n; | |
1026 | ||
1027 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1028 | if (rdev == node->regulator) { | |
1029 | list_del(&node->list); | |
40f9244f | 1030 | kfree(node->dev_name); |
0f1d747b | 1031 | kfree(node); |
0f1d747b MR |
1032 | } |
1033 | } | |
1034 | } | |
1035 | ||
f5726ae3 | 1036 | #define REG_STR_SIZE 64 |
414c70cb LG |
1037 | |
1038 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1039 | struct device *dev, | |
1040 | const char *supply_name) | |
1041 | { | |
1042 | struct regulator *regulator; | |
1043 | char buf[REG_STR_SIZE]; | |
1044 | int err, size; | |
1045 | ||
1046 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1047 | if (regulator == NULL) | |
1048 | return NULL; | |
1049 | ||
1050 | mutex_lock(&rdev->mutex); | |
1051 | regulator->rdev = rdev; | |
1052 | list_add(®ulator->list, &rdev->consumer_list); | |
1053 | ||
1054 | if (dev) { | |
1055 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1056 | size = scnprintf(buf, REG_STR_SIZE, |
1057 | "microamps_requested_%s-%s", | |
1058 | dev_name(dev), supply_name); | |
414c70cb LG |
1059 | if (size >= REG_STR_SIZE) |
1060 | goto overflow_err; | |
1061 | ||
1062 | regulator->dev = dev; | |
4f26a2ab | 1063 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1064 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1065 | if (regulator->dev_attr.attr.name == NULL) | |
1066 | goto attr_name_err; | |
1067 | ||
414c70cb LG |
1068 | regulator->dev_attr.attr.mode = 0444; |
1069 | regulator->dev_attr.show = device_requested_uA_show; | |
1070 | err = device_create_file(dev, ®ulator->dev_attr); | |
1071 | if (err < 0) { | |
5da84fd9 | 1072 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1073 | goto attr_name_err; |
1074 | } | |
1075 | ||
1076 | /* also add a link to the device sysfs entry */ | |
1077 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1078 | dev->kobj.name, supply_name); | |
1079 | if (size >= REG_STR_SIZE) | |
1080 | goto attr_err; | |
1081 | ||
1082 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1083 | if (regulator->supply_name == NULL) | |
1084 | goto attr_err; | |
1085 | ||
1086 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1087 | buf); | |
1088 | if (err) { | |
5da84fd9 JP |
1089 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1090 | dev->kobj.name, err); | |
414c70cb LG |
1091 | goto link_name_err; |
1092 | } | |
1093 | } | |
1094 | mutex_unlock(&rdev->mutex); | |
1095 | return regulator; | |
1096 | link_name_err: | |
1097 | kfree(regulator->supply_name); | |
1098 | attr_err: | |
1099 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1100 | attr_name_err: | |
1101 | kfree(regulator->dev_attr.attr.name); | |
1102 | overflow_err: | |
1103 | list_del(®ulator->list); | |
1104 | kfree(regulator); | |
1105 | mutex_unlock(&rdev->mutex); | |
1106 | return NULL; | |
1107 | } | |
1108 | ||
31aae2be MB |
1109 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1110 | { | |
1111 | if (!rdev->desc->ops->enable_time) | |
1112 | return 0; | |
1113 | return rdev->desc->ops->enable_time(rdev); | |
1114 | } | |
1115 | ||
5ffbd136 MB |
1116 | /* Internal regulator request function */ |
1117 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1118 | int exclusive) | |
414c70cb LG |
1119 | { |
1120 | struct regulator_dev *rdev; | |
1121 | struct regulator_map *map; | |
1122 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1123 | const char *devname = NULL; |
5ffbd136 | 1124 | int ret; |
414c70cb LG |
1125 | |
1126 | if (id == NULL) { | |
5da84fd9 | 1127 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1128 | return regulator; |
1129 | } | |
1130 | ||
40f9244f MB |
1131 | if (dev) |
1132 | devname = dev_name(dev); | |
1133 | ||
414c70cb LG |
1134 | mutex_lock(®ulator_list_mutex); |
1135 | ||
1136 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1137 | /* If the mapping has a device set up it must match */ |
1138 | if (map->dev_name && | |
1139 | (!devname || strcmp(map->dev_name, devname))) | |
1140 | continue; | |
1141 | ||
1142 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1143 | rdev = map->regulator; |
414c70cb | 1144 | goto found; |
a5766f11 | 1145 | } |
414c70cb | 1146 | } |
34abbd68 | 1147 | |
688fe99a MB |
1148 | if (board_wants_dummy_regulator) { |
1149 | rdev = dummy_regulator_rdev; | |
1150 | goto found; | |
1151 | } | |
1152 | ||
34abbd68 MB |
1153 | #ifdef CONFIG_REGULATOR_DUMMY |
1154 | if (!devname) | |
1155 | devname = "deviceless"; | |
1156 | ||
1157 | /* If the board didn't flag that it was fully constrained then | |
1158 | * substitute in a dummy regulator so consumers can continue. | |
1159 | */ | |
1160 | if (!has_full_constraints) { | |
5da84fd9 JP |
1161 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1162 | devname, id); | |
34abbd68 MB |
1163 | rdev = dummy_regulator_rdev; |
1164 | goto found; | |
1165 | } | |
1166 | #endif | |
1167 | ||
414c70cb LG |
1168 | mutex_unlock(®ulator_list_mutex); |
1169 | return regulator; | |
1170 | ||
1171 | found: | |
5ffbd136 MB |
1172 | if (rdev->exclusive) { |
1173 | regulator = ERR_PTR(-EPERM); | |
1174 | goto out; | |
1175 | } | |
1176 | ||
1177 | if (exclusive && rdev->open_count) { | |
1178 | regulator = ERR_PTR(-EBUSY); | |
1179 | goto out; | |
1180 | } | |
1181 | ||
a5766f11 LG |
1182 | if (!try_module_get(rdev->owner)) |
1183 | goto out; | |
1184 | ||
414c70cb LG |
1185 | regulator = create_regulator(rdev, dev, id); |
1186 | if (regulator == NULL) { | |
1187 | regulator = ERR_PTR(-ENOMEM); | |
1188 | module_put(rdev->owner); | |
1189 | } | |
1190 | ||
5ffbd136 MB |
1191 | rdev->open_count++; |
1192 | if (exclusive) { | |
1193 | rdev->exclusive = 1; | |
1194 | ||
1195 | ret = _regulator_is_enabled(rdev); | |
1196 | if (ret > 0) | |
1197 | rdev->use_count = 1; | |
1198 | else | |
1199 | rdev->use_count = 0; | |
1200 | } | |
1201 | ||
a5766f11 | 1202 | out: |
414c70cb | 1203 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1204 | |
414c70cb LG |
1205 | return regulator; |
1206 | } | |
5ffbd136 MB |
1207 | |
1208 | /** | |
1209 | * regulator_get - lookup and obtain a reference to a regulator. | |
1210 | * @dev: device for regulator "consumer" | |
1211 | * @id: Supply name or regulator ID. | |
1212 | * | |
1213 | * Returns a struct regulator corresponding to the regulator producer, | |
1214 | * or IS_ERR() condition containing errno. | |
1215 | * | |
1216 | * Use of supply names configured via regulator_set_device_supply() is | |
1217 | * strongly encouraged. It is recommended that the supply name used | |
1218 | * should match the name used for the supply and/or the relevant | |
1219 | * device pins in the datasheet. | |
1220 | */ | |
1221 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1222 | { | |
1223 | return _regulator_get(dev, id, 0); | |
1224 | } | |
414c70cb LG |
1225 | EXPORT_SYMBOL_GPL(regulator_get); |
1226 | ||
5ffbd136 MB |
1227 | /** |
1228 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1229 | * @dev: device for regulator "consumer" | |
1230 | * @id: Supply name or regulator ID. | |
1231 | * | |
1232 | * Returns a struct regulator corresponding to the regulator producer, | |
1233 | * or IS_ERR() condition containing errno. Other consumers will be | |
1234 | * unable to obtain this reference is held and the use count for the | |
1235 | * regulator will be initialised to reflect the current state of the | |
1236 | * regulator. | |
1237 | * | |
1238 | * This is intended for use by consumers which cannot tolerate shared | |
1239 | * use of the regulator such as those which need to force the | |
1240 | * regulator off for correct operation of the hardware they are | |
1241 | * controlling. | |
1242 | * | |
1243 | * Use of supply names configured via regulator_set_device_supply() is | |
1244 | * strongly encouraged. It is recommended that the supply name used | |
1245 | * should match the name used for the supply and/or the relevant | |
1246 | * device pins in the datasheet. | |
1247 | */ | |
1248 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1249 | { | |
1250 | return _regulator_get(dev, id, 1); | |
1251 | } | |
1252 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1253 | ||
414c70cb LG |
1254 | /** |
1255 | * regulator_put - "free" the regulator source | |
1256 | * @regulator: regulator source | |
1257 | * | |
1258 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1259 | * regulator source are balanced by regulator_disable calls prior to calling | |
1260 | * this function. | |
1261 | */ | |
1262 | void regulator_put(struct regulator *regulator) | |
1263 | { | |
1264 | struct regulator_dev *rdev; | |
1265 | ||
1266 | if (regulator == NULL || IS_ERR(regulator)) | |
1267 | return; | |
1268 | ||
414c70cb LG |
1269 | mutex_lock(®ulator_list_mutex); |
1270 | rdev = regulator->rdev; | |
1271 | ||
1272 | /* remove any sysfs entries */ | |
1273 | if (regulator->dev) { | |
1274 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1275 | kfree(regulator->supply_name); | |
1276 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1277 | kfree(regulator->dev_attr.attr.name); | |
1278 | } | |
1279 | list_del(®ulator->list); | |
1280 | kfree(regulator); | |
1281 | ||
5ffbd136 MB |
1282 | rdev->open_count--; |
1283 | rdev->exclusive = 0; | |
1284 | ||
414c70cb LG |
1285 | module_put(rdev->owner); |
1286 | mutex_unlock(®ulator_list_mutex); | |
1287 | } | |
1288 | EXPORT_SYMBOL_GPL(regulator_put); | |
1289 | ||
9a2372fa MB |
1290 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1291 | { | |
1292 | if (!rdev->constraints) | |
1293 | return 0; | |
1294 | ||
1295 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1296 | return 1; | |
1297 | else | |
1298 | return 0; | |
1299 | } | |
1300 | ||
414c70cb LG |
1301 | /* locks held by regulator_enable() */ |
1302 | static int _regulator_enable(struct regulator_dev *rdev) | |
1303 | { | |
31aae2be | 1304 | int ret, delay; |
414c70cb | 1305 | |
acaf6ffe BJ |
1306 | if (rdev->use_count == 0) { |
1307 | /* do we need to enable the supply regulator first */ | |
1308 | if (rdev->supply) { | |
1309 | mutex_lock(&rdev->supply->mutex); | |
1310 | ret = _regulator_enable(rdev->supply); | |
1311 | mutex_unlock(&rdev->supply->mutex); | |
1312 | if (ret < 0) { | |
5da84fd9 | 1313 | rdev_err(rdev, "failed to enable: %d\n", ret); |
acaf6ffe BJ |
1314 | return ret; |
1315 | } | |
414c70cb LG |
1316 | } |
1317 | } | |
1318 | ||
1319 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1320 | if (rdev->constraints && |
1321 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1322 | drms_uA_update(rdev); | |
414c70cb | 1323 | |
9a2372fa MB |
1324 | if (rdev->use_count == 0) { |
1325 | /* The regulator may on if it's not switchable or left on */ | |
1326 | ret = _regulator_is_enabled(rdev); | |
1327 | if (ret == -EINVAL || ret == 0) { | |
1328 | if (!_regulator_can_change_status(rdev)) | |
1329 | return -EPERM; | |
1330 | ||
31aae2be | 1331 | if (!rdev->desc->ops->enable) |
9a2372fa | 1332 | return -EINVAL; |
31aae2be MB |
1333 | |
1334 | /* Query before enabling in case configuration | |
25985edc | 1335 | * dependent. */ |
31aae2be MB |
1336 | ret = _regulator_get_enable_time(rdev); |
1337 | if (ret >= 0) { | |
1338 | delay = ret; | |
1339 | } else { | |
5da84fd9 | 1340 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1341 | ret); |
31aae2be | 1342 | delay = 0; |
9a2372fa | 1343 | } |
31aae2be | 1344 | |
02fa3ec0 MB |
1345 | trace_regulator_enable(rdev_get_name(rdev)); |
1346 | ||
31aae2be MB |
1347 | /* Allow the regulator to ramp; it would be useful |
1348 | * to extend this for bulk operations so that the | |
1349 | * regulators can ramp together. */ | |
1350 | ret = rdev->desc->ops->enable(rdev); | |
1351 | if (ret < 0) | |
1352 | return ret; | |
1353 | ||
02fa3ec0 MB |
1354 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1355 | ||
e36c1df8 | 1356 | if (delay >= 1000) { |
31aae2be | 1357 | mdelay(delay / 1000); |
e36c1df8 AL |
1358 | udelay(delay % 1000); |
1359 | } else if (delay) { | |
31aae2be | 1360 | udelay(delay); |
e36c1df8 | 1361 | } |
31aae2be | 1362 | |
02fa3ec0 MB |
1363 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1364 | ||
a7433cff | 1365 | } else if (ret < 0) { |
5da84fd9 | 1366 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1367 | return ret; |
1368 | } | |
a7433cff | 1369 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1370 | } |
1371 | ||
9a2372fa MB |
1372 | rdev->use_count++; |
1373 | ||
1374 | return 0; | |
414c70cb LG |
1375 | } |
1376 | ||
1377 | /** | |
1378 | * regulator_enable - enable regulator output | |
1379 | * @regulator: regulator source | |
1380 | * | |
cf7bbcdf MB |
1381 | * Request that the regulator be enabled with the regulator output at |
1382 | * the predefined voltage or current value. Calls to regulator_enable() | |
1383 | * must be balanced with calls to regulator_disable(). | |
1384 | * | |
414c70cb | 1385 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1386 | * hardwired in the regulator. |
414c70cb LG |
1387 | */ |
1388 | int regulator_enable(struct regulator *regulator) | |
1389 | { | |
412aec61 DB |
1390 | struct regulator_dev *rdev = regulator->rdev; |
1391 | int ret = 0; | |
414c70cb | 1392 | |
412aec61 | 1393 | mutex_lock(&rdev->mutex); |
cd94b505 | 1394 | ret = _regulator_enable(rdev); |
412aec61 | 1395 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1396 | return ret; |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1399 | ||
1400 | /* locks held by regulator_disable() */ | |
8cbf811d JC |
1401 | static int _regulator_disable(struct regulator_dev *rdev, |
1402 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1403 | { |
1404 | int ret = 0; | |
b12a1e29 | 1405 | *supply_rdev_ptr = NULL; |
414c70cb | 1406 | |
cd94b505 | 1407 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1408 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1409 | return -EIO; |
1410 | ||
414c70cb | 1411 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1412 | if (rdev->use_count == 1 && |
1413 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1414 | |
1415 | /* we are last user */ | |
9a2372fa MB |
1416 | if (_regulator_can_change_status(rdev) && |
1417 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1418 | trace_regulator_disable(rdev_get_name(rdev)); |
1419 | ||
414c70cb LG |
1420 | ret = rdev->desc->ops->disable(rdev); |
1421 | if (ret < 0) { | |
5da84fd9 | 1422 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1423 | return ret; |
1424 | } | |
84b68263 | 1425 | |
02fa3ec0 MB |
1426 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1427 | ||
84b68263 MB |
1428 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1429 | NULL); | |
414c70cb LG |
1430 | } |
1431 | ||
1432 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1433 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1434 | |
1435 | rdev->use_count = 0; | |
1436 | } else if (rdev->use_count > 1) { | |
1437 | ||
1438 | if (rdev->constraints && | |
1439 | (rdev->constraints->valid_ops_mask & | |
1440 | REGULATOR_CHANGE_DRMS)) | |
1441 | drms_uA_update(rdev); | |
1442 | ||
1443 | rdev->use_count--; | |
1444 | } | |
1445 | return ret; | |
1446 | } | |
1447 | ||
1448 | /** | |
1449 | * regulator_disable - disable regulator output | |
1450 | * @regulator: regulator source | |
1451 | * | |
cf7bbcdf MB |
1452 | * Disable the regulator output voltage or current. Calls to |
1453 | * regulator_enable() must be balanced with calls to | |
1454 | * regulator_disable(). | |
69279fb9 | 1455 | * |
414c70cb | 1456 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1457 | * devices have it enabled, the regulator device supports disabling and |
1458 | * machine constraints permit this operation. | |
414c70cb LG |
1459 | */ |
1460 | int regulator_disable(struct regulator *regulator) | |
1461 | { | |
412aec61 | 1462 | struct regulator_dev *rdev = regulator->rdev; |
8cbf811d | 1463 | struct regulator_dev *supply_rdev = NULL; |
412aec61 | 1464 | int ret = 0; |
414c70cb | 1465 | |
412aec61 | 1466 | mutex_lock(&rdev->mutex); |
8cbf811d | 1467 | ret = _regulator_disable(rdev, &supply_rdev); |
412aec61 | 1468 | mutex_unlock(&rdev->mutex); |
8cbf811d JC |
1469 | |
1470 | /* decrease our supplies ref count and disable if required */ | |
1471 | while (supply_rdev != NULL) { | |
1472 | rdev = supply_rdev; | |
1473 | ||
1474 | mutex_lock(&rdev->mutex); | |
1475 | _regulator_disable(rdev, &supply_rdev); | |
1476 | mutex_unlock(&rdev->mutex); | |
1477 | } | |
1478 | ||
414c70cb LG |
1479 | return ret; |
1480 | } | |
1481 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1482 | ||
1483 | /* locks held by regulator_force_disable() */ | |
8cbf811d JC |
1484 | static int _regulator_force_disable(struct regulator_dev *rdev, |
1485 | struct regulator_dev **supply_rdev_ptr) | |
414c70cb LG |
1486 | { |
1487 | int ret = 0; | |
1488 | ||
1489 | /* force disable */ | |
1490 | if (rdev->desc->ops->disable) { | |
1491 | /* ah well, who wants to live forever... */ | |
1492 | ret = rdev->desc->ops->disable(rdev); | |
1493 | if (ret < 0) { | |
5da84fd9 | 1494 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1495 | return ret; |
1496 | } | |
1497 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1498 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1499 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1500 | } |
1501 | ||
1502 | /* decrease our supplies ref count and disable if required */ | |
8cbf811d | 1503 | *supply_rdev_ptr = rdev->supply; |
414c70cb LG |
1504 | |
1505 | rdev->use_count = 0; | |
1506 | return ret; | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * regulator_force_disable - force disable regulator output | |
1511 | * @regulator: regulator source | |
1512 | * | |
1513 | * Forcibly disable the regulator output voltage or current. | |
1514 | * NOTE: this *will* disable the regulator output even if other consumer | |
1515 | * devices have it enabled. This should be used for situations when device | |
1516 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1517 | */ | |
1518 | int regulator_force_disable(struct regulator *regulator) | |
1519 | { | |
82d15839 | 1520 | struct regulator_dev *rdev = regulator->rdev; |
8cbf811d | 1521 | struct regulator_dev *supply_rdev = NULL; |
414c70cb LG |
1522 | int ret; |
1523 | ||
82d15839 | 1524 | mutex_lock(&rdev->mutex); |
414c70cb | 1525 | regulator->uA_load = 0; |
82d15839 MB |
1526 | ret = _regulator_force_disable(rdev, &supply_rdev); |
1527 | mutex_unlock(&rdev->mutex); | |
8cbf811d JC |
1528 | |
1529 | if (supply_rdev) | |
1530 | regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); | |
1531 | ||
414c70cb LG |
1532 | return ret; |
1533 | } | |
1534 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1535 | ||
1536 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1537 | { | |
9a7f6a4c | 1538 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1539 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1540 | return 1; |
414c70cb | 1541 | |
9332546f | 1542 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1543 | } |
1544 | ||
1545 | /** | |
1546 | * regulator_is_enabled - is the regulator output enabled | |
1547 | * @regulator: regulator source | |
1548 | * | |
412aec61 DB |
1549 | * Returns positive if the regulator driver backing the source/client |
1550 | * has requested that the device be enabled, zero if it hasn't, else a | |
1551 | * negative errno code. | |
1552 | * | |
1553 | * Note that the device backing this regulator handle can have multiple | |
1554 | * users, so it might be enabled even if regulator_enable() was never | |
1555 | * called for this particular source. | |
414c70cb LG |
1556 | */ |
1557 | int regulator_is_enabled(struct regulator *regulator) | |
1558 | { | |
9332546f MB |
1559 | int ret; |
1560 | ||
1561 | mutex_lock(®ulator->rdev->mutex); | |
1562 | ret = _regulator_is_enabled(regulator->rdev); | |
1563 | mutex_unlock(®ulator->rdev->mutex); | |
1564 | ||
1565 | return ret; | |
414c70cb LG |
1566 | } |
1567 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1568 | ||
4367cfdc DB |
1569 | /** |
1570 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1571 | * @regulator: regulator source | |
1572 | * | |
1573 | * Returns number of selectors, or negative errno. Selectors are | |
1574 | * numbered starting at zero, and typically correspond to bitfields | |
1575 | * in hardware registers. | |
1576 | */ | |
1577 | int regulator_count_voltages(struct regulator *regulator) | |
1578 | { | |
1579 | struct regulator_dev *rdev = regulator->rdev; | |
1580 | ||
1581 | return rdev->desc->n_voltages ? : -EINVAL; | |
1582 | } | |
1583 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1584 | ||
1585 | /** | |
1586 | * regulator_list_voltage - enumerate supported voltages | |
1587 | * @regulator: regulator source | |
1588 | * @selector: identify voltage to list | |
1589 | * Context: can sleep | |
1590 | * | |
1591 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1592 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1593 | * negative errno. |
1594 | */ | |
1595 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1596 | { | |
1597 | struct regulator_dev *rdev = regulator->rdev; | |
1598 | struct regulator_ops *ops = rdev->desc->ops; | |
1599 | int ret; | |
1600 | ||
1601 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1602 | return -EINVAL; | |
1603 | ||
1604 | mutex_lock(&rdev->mutex); | |
1605 | ret = ops->list_voltage(rdev, selector); | |
1606 | mutex_unlock(&rdev->mutex); | |
1607 | ||
1608 | if (ret > 0) { | |
1609 | if (ret < rdev->constraints->min_uV) | |
1610 | ret = 0; | |
1611 | else if (ret > rdev->constraints->max_uV) | |
1612 | ret = 0; | |
1613 | } | |
1614 | ||
1615 | return ret; | |
1616 | } | |
1617 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1618 | ||
a7a1ad90 MB |
1619 | /** |
1620 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1621 | * | |
1622 | * @regulator: Regulator to check. | |
1623 | * @min_uV: Minimum required voltage in uV. | |
1624 | * @max_uV: Maximum required voltage in uV. | |
1625 | * | |
1626 | * Returns a boolean or a negative error code. | |
1627 | */ | |
1628 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1629 | int min_uV, int max_uV) | |
1630 | { | |
1631 | int i, voltages, ret; | |
1632 | ||
1633 | ret = regulator_count_voltages(regulator); | |
1634 | if (ret < 0) | |
1635 | return ret; | |
1636 | voltages = ret; | |
1637 | ||
1638 | for (i = 0; i < voltages; i++) { | |
1639 | ret = regulator_list_voltage(regulator, i); | |
1640 | ||
1641 | if (ret >= min_uV && ret <= max_uV) | |
1642 | return 1; | |
1643 | } | |
1644 | ||
1645 | return 0; | |
1646 | } | |
1647 | ||
75790251 MB |
1648 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
1649 | int min_uV, int max_uV) | |
1650 | { | |
1651 | int ret; | |
77af1b26 | 1652 | int delay = 0; |
75790251 MB |
1653 | unsigned int selector; |
1654 | ||
1655 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
1656 | ||
bf5892a8 MB |
1657 | min_uV += rdev->constraints->uV_offset; |
1658 | max_uV += rdev->constraints->uV_offset; | |
1659 | ||
75790251 MB |
1660 | if (rdev->desc->ops->set_voltage) { |
1661 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
1662 | &selector); | |
1663 | ||
1664 | if (rdev->desc->ops->list_voltage) | |
1665 | selector = rdev->desc->ops->list_voltage(rdev, | |
1666 | selector); | |
1667 | else | |
1668 | selector = -1; | |
e8eef82b MB |
1669 | } else if (rdev->desc->ops->set_voltage_sel) { |
1670 | int best_val = INT_MAX; | |
1671 | int i; | |
1672 | ||
1673 | selector = 0; | |
1674 | ||
1675 | /* Find the smallest voltage that falls within the specified | |
1676 | * range. | |
1677 | */ | |
1678 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1679 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
1680 | if (ret < 0) | |
1681 | continue; | |
1682 | ||
1683 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
1684 | best_val = ret; | |
1685 | selector = i; | |
1686 | } | |
1687 | } | |
1688 | ||
77af1b26 LW |
1689 | /* |
1690 | * If we can't obtain the old selector there is not enough | |
1691 | * info to call set_voltage_time_sel(). | |
1692 | */ | |
1693 | if (rdev->desc->ops->set_voltage_time_sel && | |
1694 | rdev->desc->ops->get_voltage_sel) { | |
1695 | unsigned int old_selector = 0; | |
1696 | ||
1697 | ret = rdev->desc->ops->get_voltage_sel(rdev); | |
1698 | if (ret < 0) | |
1699 | return ret; | |
1700 | old_selector = ret; | |
1701 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, | |
1702 | old_selector, selector); | |
1703 | } | |
1704 | ||
e8eef82b MB |
1705 | if (best_val != INT_MAX) { |
1706 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
1707 | selector = best_val; | |
1708 | } else { | |
1709 | ret = -EINVAL; | |
1710 | } | |
75790251 MB |
1711 | } else { |
1712 | ret = -EINVAL; | |
1713 | } | |
1714 | ||
77af1b26 LW |
1715 | /* Insert any necessary delays */ |
1716 | if (delay >= 1000) { | |
1717 | mdelay(delay / 1000); | |
1718 | udelay(delay % 1000); | |
1719 | } else if (delay) { | |
1720 | udelay(delay); | |
1721 | } | |
1722 | ||
ded06a52 MB |
1723 | if (ret == 0) |
1724 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
1725 | NULL); | |
1726 | ||
75790251 MB |
1727 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1728 | ||
1729 | return ret; | |
1730 | } | |
1731 | ||
414c70cb LG |
1732 | /** |
1733 | * regulator_set_voltage - set regulator output voltage | |
1734 | * @regulator: regulator source | |
1735 | * @min_uV: Minimum required voltage in uV | |
1736 | * @max_uV: Maximum acceptable voltage in uV | |
1737 | * | |
1738 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1739 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1740 | * | |
1741 | * If the regulator is enabled then the voltage will change to the new value | |
1742 | * immediately otherwise if the regulator is disabled the regulator will | |
1743 | * output at the new voltage when enabled. | |
1744 | * | |
1745 | * NOTE: If the regulator is shared between several devices then the lowest | |
1746 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1747 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1748 | * calling this function otherwise this call will fail. |
1749 | */ | |
1750 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1751 | { | |
1752 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 1753 | int ret = 0; |
414c70cb LG |
1754 | |
1755 | mutex_lock(&rdev->mutex); | |
1756 | ||
95a3c23a MB |
1757 | /* If we're setting the same range as last time the change |
1758 | * should be a noop (some cpufreq implementations use the same | |
1759 | * voltage for multiple frequencies, for example). | |
1760 | */ | |
1761 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
1762 | goto out; | |
1763 | ||
414c70cb | 1764 | /* sanity check */ |
e8eef82b MB |
1765 | if (!rdev->desc->ops->set_voltage && |
1766 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
1767 | ret = -EINVAL; |
1768 | goto out; | |
1769 | } | |
1770 | ||
1771 | /* constraints check */ | |
1772 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1773 | if (ret < 0) | |
1774 | goto out; | |
1775 | regulator->min_uV = min_uV; | |
1776 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1777 | |
05fda3b1 TP |
1778 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1779 | if (ret < 0) | |
1780 | goto out; | |
1781 | ||
75790251 | 1782 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 1783 | |
414c70cb LG |
1784 | out: |
1785 | mutex_unlock(&rdev->mutex); | |
1786 | return ret; | |
1787 | } | |
1788 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1789 | ||
88cd222b LW |
1790 | /** |
1791 | * regulator_set_voltage_time - get raise/fall time | |
1792 | * @regulator: regulator source | |
1793 | * @old_uV: starting voltage in microvolts | |
1794 | * @new_uV: target voltage in microvolts | |
1795 | * | |
1796 | * Provided with the starting and ending voltage, this function attempts to | |
1797 | * calculate the time in microseconds required to rise or fall to this new | |
1798 | * voltage. | |
1799 | */ | |
1800 | int regulator_set_voltage_time(struct regulator *regulator, | |
1801 | int old_uV, int new_uV) | |
1802 | { | |
1803 | struct regulator_dev *rdev = regulator->rdev; | |
1804 | struct regulator_ops *ops = rdev->desc->ops; | |
1805 | int old_sel = -1; | |
1806 | int new_sel = -1; | |
1807 | int voltage; | |
1808 | int i; | |
1809 | ||
1810 | /* Currently requires operations to do this */ | |
1811 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
1812 | || !rdev->desc->n_voltages) | |
1813 | return -EINVAL; | |
1814 | ||
1815 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1816 | /* We only look for exact voltage matches here */ | |
1817 | voltage = regulator_list_voltage(regulator, i); | |
1818 | if (voltage < 0) | |
1819 | return -EINVAL; | |
1820 | if (voltage == 0) | |
1821 | continue; | |
1822 | if (voltage == old_uV) | |
1823 | old_sel = i; | |
1824 | if (voltage == new_uV) | |
1825 | new_sel = i; | |
1826 | } | |
1827 | ||
1828 | if (old_sel < 0 || new_sel < 0) | |
1829 | return -EINVAL; | |
1830 | ||
1831 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
1832 | } | |
1833 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
1834 | ||
606a2562 MB |
1835 | /** |
1836 | * regulator_sync_voltage - re-apply last regulator output voltage | |
1837 | * @regulator: regulator source | |
1838 | * | |
1839 | * Re-apply the last configured voltage. This is intended to be used | |
1840 | * where some external control source the consumer is cooperating with | |
1841 | * has caused the configured voltage to change. | |
1842 | */ | |
1843 | int regulator_sync_voltage(struct regulator *regulator) | |
1844 | { | |
1845 | struct regulator_dev *rdev = regulator->rdev; | |
1846 | int ret, min_uV, max_uV; | |
1847 | ||
1848 | mutex_lock(&rdev->mutex); | |
1849 | ||
1850 | if (!rdev->desc->ops->set_voltage && | |
1851 | !rdev->desc->ops->set_voltage_sel) { | |
1852 | ret = -EINVAL; | |
1853 | goto out; | |
1854 | } | |
1855 | ||
1856 | /* This is only going to work if we've had a voltage configured. */ | |
1857 | if (!regulator->min_uV && !regulator->max_uV) { | |
1858 | ret = -EINVAL; | |
1859 | goto out; | |
1860 | } | |
1861 | ||
1862 | min_uV = regulator->min_uV; | |
1863 | max_uV = regulator->max_uV; | |
1864 | ||
1865 | /* This should be a paranoia check... */ | |
1866 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1867 | if (ret < 0) | |
1868 | goto out; | |
1869 | ||
1870 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
1871 | if (ret < 0) | |
1872 | goto out; | |
1873 | ||
1874 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
1875 | ||
1876 | out: | |
1877 | mutex_unlock(&rdev->mutex); | |
1878 | return ret; | |
1879 | } | |
1880 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
1881 | ||
414c70cb LG |
1882 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
1883 | { | |
bf5892a8 | 1884 | int sel, ret; |
476c2d83 MB |
1885 | |
1886 | if (rdev->desc->ops->get_voltage_sel) { | |
1887 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
1888 | if (sel < 0) | |
1889 | return sel; | |
bf5892a8 | 1890 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 1891 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 1892 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 1893 | } else { |
414c70cb | 1894 | return -EINVAL; |
cb220d16 | 1895 | } |
bf5892a8 | 1896 | |
cb220d16 AL |
1897 | if (ret < 0) |
1898 | return ret; | |
bf5892a8 | 1899 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
1900 | } |
1901 | ||
1902 | /** | |
1903 | * regulator_get_voltage - get regulator output voltage | |
1904 | * @regulator: regulator source | |
1905 | * | |
1906 | * This returns the current regulator voltage in uV. | |
1907 | * | |
1908 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1909 | * function should not be used to determine regulator state. | |
1910 | */ | |
1911 | int regulator_get_voltage(struct regulator *regulator) | |
1912 | { | |
1913 | int ret; | |
1914 | ||
1915 | mutex_lock(®ulator->rdev->mutex); | |
1916 | ||
1917 | ret = _regulator_get_voltage(regulator->rdev); | |
1918 | ||
1919 | mutex_unlock(®ulator->rdev->mutex); | |
1920 | ||
1921 | return ret; | |
1922 | } | |
1923 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1924 | ||
1925 | /** | |
1926 | * regulator_set_current_limit - set regulator output current limit | |
1927 | * @regulator: regulator source | |
1928 | * @min_uA: Minimuum supported current in uA | |
1929 | * @max_uA: Maximum supported current in uA | |
1930 | * | |
1931 | * Sets current sink to the desired output current. This can be set during | |
1932 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1933 | * | |
1934 | * If the regulator is enabled then the current will change to the new value | |
1935 | * immediately otherwise if the regulator is disabled the regulator will | |
1936 | * output at the new current when enabled. | |
1937 | * | |
1938 | * NOTE: Regulator system constraints must be set for this regulator before | |
1939 | * calling this function otherwise this call will fail. | |
1940 | */ | |
1941 | int regulator_set_current_limit(struct regulator *regulator, | |
1942 | int min_uA, int max_uA) | |
1943 | { | |
1944 | struct regulator_dev *rdev = regulator->rdev; | |
1945 | int ret; | |
1946 | ||
1947 | mutex_lock(&rdev->mutex); | |
1948 | ||
1949 | /* sanity check */ | |
1950 | if (!rdev->desc->ops->set_current_limit) { | |
1951 | ret = -EINVAL; | |
1952 | goto out; | |
1953 | } | |
1954 | ||
1955 | /* constraints check */ | |
1956 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1957 | if (ret < 0) | |
1958 | goto out; | |
1959 | ||
1960 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1961 | out: | |
1962 | mutex_unlock(&rdev->mutex); | |
1963 | return ret; | |
1964 | } | |
1965 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1966 | ||
1967 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1968 | { | |
1969 | int ret; | |
1970 | ||
1971 | mutex_lock(&rdev->mutex); | |
1972 | ||
1973 | /* sanity check */ | |
1974 | if (!rdev->desc->ops->get_current_limit) { | |
1975 | ret = -EINVAL; | |
1976 | goto out; | |
1977 | } | |
1978 | ||
1979 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1980 | out: | |
1981 | mutex_unlock(&rdev->mutex); | |
1982 | return ret; | |
1983 | } | |
1984 | ||
1985 | /** | |
1986 | * regulator_get_current_limit - get regulator output current | |
1987 | * @regulator: regulator source | |
1988 | * | |
1989 | * This returns the current supplied by the specified current sink in uA. | |
1990 | * | |
1991 | * NOTE: If the regulator is disabled it will return the current value. This | |
1992 | * function should not be used to determine regulator state. | |
1993 | */ | |
1994 | int regulator_get_current_limit(struct regulator *regulator) | |
1995 | { | |
1996 | return _regulator_get_current_limit(regulator->rdev); | |
1997 | } | |
1998 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1999 | ||
2000 | /** | |
2001 | * regulator_set_mode - set regulator operating mode | |
2002 | * @regulator: regulator source | |
2003 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2004 | * | |
2005 | * Set regulator operating mode to increase regulator efficiency or improve | |
2006 | * regulation performance. | |
2007 | * | |
2008 | * NOTE: Regulator system constraints must be set for this regulator before | |
2009 | * calling this function otherwise this call will fail. | |
2010 | */ | |
2011 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2012 | { | |
2013 | struct regulator_dev *rdev = regulator->rdev; | |
2014 | int ret; | |
500b4ac9 | 2015 | int regulator_curr_mode; |
414c70cb LG |
2016 | |
2017 | mutex_lock(&rdev->mutex); | |
2018 | ||
2019 | /* sanity check */ | |
2020 | if (!rdev->desc->ops->set_mode) { | |
2021 | ret = -EINVAL; | |
2022 | goto out; | |
2023 | } | |
2024 | ||
500b4ac9 SI |
2025 | /* return if the same mode is requested */ |
2026 | if (rdev->desc->ops->get_mode) { | |
2027 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2028 | if (regulator_curr_mode == mode) { | |
2029 | ret = 0; | |
2030 | goto out; | |
2031 | } | |
2032 | } | |
2033 | ||
414c70cb | 2034 | /* constraints check */ |
22c51b47 | 2035 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2036 | if (ret < 0) |
2037 | goto out; | |
2038 | ||
2039 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2040 | out: | |
2041 | mutex_unlock(&rdev->mutex); | |
2042 | return ret; | |
2043 | } | |
2044 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2045 | ||
2046 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2047 | { | |
2048 | int ret; | |
2049 | ||
2050 | mutex_lock(&rdev->mutex); | |
2051 | ||
2052 | /* sanity check */ | |
2053 | if (!rdev->desc->ops->get_mode) { | |
2054 | ret = -EINVAL; | |
2055 | goto out; | |
2056 | } | |
2057 | ||
2058 | ret = rdev->desc->ops->get_mode(rdev); | |
2059 | out: | |
2060 | mutex_unlock(&rdev->mutex); | |
2061 | return ret; | |
2062 | } | |
2063 | ||
2064 | /** | |
2065 | * regulator_get_mode - get regulator operating mode | |
2066 | * @regulator: regulator source | |
2067 | * | |
2068 | * Get the current regulator operating mode. | |
2069 | */ | |
2070 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2071 | { | |
2072 | return _regulator_get_mode(regulator->rdev); | |
2073 | } | |
2074 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2075 | ||
2076 | /** | |
2077 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2078 | * @regulator: regulator source | |
2079 | * @uA_load: load current | |
2080 | * | |
2081 | * Notifies the regulator core of a new device load. This is then used by | |
2082 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2083 | * operating mode for the new regulator loading. | |
2084 | * | |
2085 | * Consumer devices notify their supply regulator of the maximum power | |
2086 | * they will require (can be taken from device datasheet in the power | |
2087 | * consumption tables) when they change operational status and hence power | |
2088 | * state. Examples of operational state changes that can affect power | |
2089 | * consumption are :- | |
2090 | * | |
2091 | * o Device is opened / closed. | |
2092 | * o Device I/O is about to begin or has just finished. | |
2093 | * o Device is idling in between work. | |
2094 | * | |
2095 | * This information is also exported via sysfs to userspace. | |
2096 | * | |
2097 | * DRMS will sum the total requested load on the regulator and change | |
2098 | * to the most efficient operating mode if platform constraints allow. | |
2099 | * | |
2100 | * Returns the new regulator mode or error. | |
2101 | */ | |
2102 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2103 | { | |
2104 | struct regulator_dev *rdev = regulator->rdev; | |
2105 | struct regulator *consumer; | |
2106 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2107 | unsigned int mode; | |
2108 | ||
2109 | mutex_lock(&rdev->mutex); | |
2110 | ||
a4b41483 MB |
2111 | /* |
2112 | * first check to see if we can set modes at all, otherwise just | |
2113 | * tell the consumer everything is OK. | |
2114 | */ | |
414c70cb LG |
2115 | regulator->uA_load = uA_load; |
2116 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2117 | if (ret < 0) { |
2118 | ret = 0; | |
414c70cb | 2119 | goto out; |
a4b41483 | 2120 | } |
414c70cb | 2121 | |
414c70cb LG |
2122 | if (!rdev->desc->ops->get_optimum_mode) |
2123 | goto out; | |
2124 | ||
a4b41483 MB |
2125 | /* |
2126 | * we can actually do this so any errors are indicators of | |
2127 | * potential real failure. | |
2128 | */ | |
2129 | ret = -EINVAL; | |
2130 | ||
414c70cb | 2131 | /* get output voltage */ |
1bf5a1f8 | 2132 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2133 | if (output_uV <= 0) { |
5da84fd9 | 2134 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2135 | goto out; |
2136 | } | |
2137 | ||
2138 | /* get input voltage */ | |
1bf5a1f8 MB |
2139 | input_uV = 0; |
2140 | if (rdev->supply) | |
2141 | input_uV = _regulator_get_voltage(rdev->supply); | |
2142 | if (input_uV <= 0) | |
414c70cb LG |
2143 | input_uV = rdev->constraints->input_uV; |
2144 | if (input_uV <= 0) { | |
5da84fd9 | 2145 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2146 | goto out; |
2147 | } | |
2148 | ||
2149 | /* calc total requested load for this regulator */ | |
2150 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2151 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2152 | |
2153 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2154 | input_uV, output_uV, | |
2155 | total_uA_load); | |
2c608234 | 2156 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2157 | if (ret < 0) { |
5da84fd9 JP |
2158 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2159 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2160 | goto out; |
2161 | } | |
2162 | ||
2163 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2164 | if (ret < 0) { |
5da84fd9 | 2165 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2166 | goto out; |
2167 | } | |
2168 | ret = mode; | |
2169 | out: | |
2170 | mutex_unlock(&rdev->mutex); | |
2171 | return ret; | |
2172 | } | |
2173 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2174 | ||
2175 | /** | |
2176 | * regulator_register_notifier - register regulator event notifier | |
2177 | * @regulator: regulator source | |
69279fb9 | 2178 | * @nb: notifier block |
414c70cb LG |
2179 | * |
2180 | * Register notifier block to receive regulator events. | |
2181 | */ | |
2182 | int regulator_register_notifier(struct regulator *regulator, | |
2183 | struct notifier_block *nb) | |
2184 | { | |
2185 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2186 | nb); | |
2187 | } | |
2188 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2189 | ||
2190 | /** | |
2191 | * regulator_unregister_notifier - unregister regulator event notifier | |
2192 | * @regulator: regulator source | |
69279fb9 | 2193 | * @nb: notifier block |
414c70cb LG |
2194 | * |
2195 | * Unregister regulator event notifier block. | |
2196 | */ | |
2197 | int regulator_unregister_notifier(struct regulator *regulator, | |
2198 | struct notifier_block *nb) | |
2199 | { | |
2200 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2201 | nb); | |
2202 | } | |
2203 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2204 | ||
b136fb44 JC |
2205 | /* notify regulator consumers and downstream regulator consumers. |
2206 | * Note mutex must be held by caller. | |
2207 | */ | |
414c70cb LG |
2208 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2209 | unsigned long event, void *data) | |
2210 | { | |
2211 | struct regulator_dev *_rdev; | |
2212 | ||
2213 | /* call rdev chain first */ | |
414c70cb | 2214 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2215 | |
2216 | /* now notify regulator we supply */ | |
b136fb44 | 2217 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
2218 | mutex_lock(&_rdev->mutex); |
2219 | _notifier_call_chain(_rdev, event, data); | |
2220 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 2221 | } |
414c70cb LG |
2222 | } |
2223 | ||
2224 | /** | |
2225 | * regulator_bulk_get - get multiple regulator consumers | |
2226 | * | |
2227 | * @dev: Device to supply | |
2228 | * @num_consumers: Number of consumers to register | |
2229 | * @consumers: Configuration of consumers; clients are stored here. | |
2230 | * | |
2231 | * @return 0 on success, an errno on failure. | |
2232 | * | |
2233 | * This helper function allows drivers to get several regulator | |
2234 | * consumers in one operation. If any of the regulators cannot be | |
2235 | * acquired then any regulators that were allocated will be freed | |
2236 | * before returning to the caller. | |
2237 | */ | |
2238 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2239 | struct regulator_bulk_data *consumers) | |
2240 | { | |
2241 | int i; | |
2242 | int ret; | |
2243 | ||
2244 | for (i = 0; i < num_consumers; i++) | |
2245 | consumers[i].consumer = NULL; | |
2246 | ||
2247 | for (i = 0; i < num_consumers; i++) { | |
2248 | consumers[i].consumer = regulator_get(dev, | |
2249 | consumers[i].supply); | |
2250 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2251 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2252 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2253 | consumers[i].supply, ret); | |
414c70cb LG |
2254 | consumers[i].consumer = NULL; |
2255 | goto err; | |
2256 | } | |
2257 | } | |
2258 | ||
2259 | return 0; | |
2260 | ||
2261 | err: | |
2262 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2263 | regulator_put(consumers[i].consumer); | |
2264 | ||
2265 | return ret; | |
2266 | } | |
2267 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2268 | ||
f21e0e81 MB |
2269 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2270 | { | |
2271 | struct regulator_bulk_data *bulk = data; | |
2272 | ||
2273 | bulk->ret = regulator_enable(bulk->consumer); | |
2274 | } | |
2275 | ||
414c70cb LG |
2276 | /** |
2277 | * regulator_bulk_enable - enable multiple regulator consumers | |
2278 | * | |
2279 | * @num_consumers: Number of consumers | |
2280 | * @consumers: Consumer data; clients are stored here. | |
2281 | * @return 0 on success, an errno on failure | |
2282 | * | |
2283 | * This convenience API allows consumers to enable multiple regulator | |
2284 | * clients in a single API call. If any consumers cannot be enabled | |
2285 | * then any others that were enabled will be disabled again prior to | |
2286 | * return. | |
2287 | */ | |
2288 | int regulator_bulk_enable(int num_consumers, | |
2289 | struct regulator_bulk_data *consumers) | |
2290 | { | |
f21e0e81 | 2291 | LIST_HEAD(async_domain); |
414c70cb | 2292 | int i; |
f21e0e81 | 2293 | int ret = 0; |
414c70cb | 2294 | |
f21e0e81 MB |
2295 | for (i = 0; i < num_consumers; i++) |
2296 | async_schedule_domain(regulator_bulk_enable_async, | |
2297 | &consumers[i], &async_domain); | |
2298 | ||
2299 | async_synchronize_full_domain(&async_domain); | |
2300 | ||
2301 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2302 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2303 | if (consumers[i].ret != 0) { |
2304 | ret = consumers[i].ret; | |
414c70cb | 2305 | goto err; |
f21e0e81 | 2306 | } |
414c70cb LG |
2307 | } |
2308 | ||
2309 | return 0; | |
2310 | ||
2311 | err: | |
f21e0e81 MB |
2312 | for (i = 0; i < num_consumers; i++) |
2313 | if (consumers[i].ret == 0) | |
2314 | regulator_disable(consumers[i].consumer); | |
2315 | else | |
2316 | pr_err("Failed to enable %s: %d\n", | |
2317 | consumers[i].supply, consumers[i].ret); | |
414c70cb LG |
2318 | |
2319 | return ret; | |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2322 | ||
2323 | /** | |
2324 | * regulator_bulk_disable - disable multiple regulator consumers | |
2325 | * | |
2326 | * @num_consumers: Number of consumers | |
2327 | * @consumers: Consumer data; clients are stored here. | |
2328 | * @return 0 on success, an errno on failure | |
2329 | * | |
2330 | * This convenience API allows consumers to disable multiple regulator | |
2331 | * clients in a single API call. If any consumers cannot be enabled | |
2332 | * then any others that were disabled will be disabled again prior to | |
2333 | * return. | |
2334 | */ | |
2335 | int regulator_bulk_disable(int num_consumers, | |
2336 | struct regulator_bulk_data *consumers) | |
2337 | { | |
2338 | int i; | |
2339 | int ret; | |
2340 | ||
2341 | for (i = 0; i < num_consumers; i++) { | |
2342 | ret = regulator_disable(consumers[i].consumer); | |
2343 | if (ret != 0) | |
2344 | goto err; | |
2345 | } | |
2346 | ||
2347 | return 0; | |
2348 | ||
2349 | err: | |
5da84fd9 | 2350 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2351 | for (--i; i >= 0; --i) |
414c70cb LG |
2352 | regulator_enable(consumers[i].consumer); |
2353 | ||
2354 | return ret; | |
2355 | } | |
2356 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2357 | ||
2358 | /** | |
2359 | * regulator_bulk_free - free multiple regulator consumers | |
2360 | * | |
2361 | * @num_consumers: Number of consumers | |
2362 | * @consumers: Consumer data; clients are stored here. | |
2363 | * | |
2364 | * This convenience API allows consumers to free multiple regulator | |
2365 | * clients in a single API call. | |
2366 | */ | |
2367 | void regulator_bulk_free(int num_consumers, | |
2368 | struct regulator_bulk_data *consumers) | |
2369 | { | |
2370 | int i; | |
2371 | ||
2372 | for (i = 0; i < num_consumers; i++) { | |
2373 | regulator_put(consumers[i].consumer); | |
2374 | consumers[i].consumer = NULL; | |
2375 | } | |
2376 | } | |
2377 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2378 | ||
2379 | /** | |
2380 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2381 | * @rdev: regulator source |
414c70cb | 2382 | * @event: notifier block |
69279fb9 | 2383 | * @data: callback-specific data. |
414c70cb LG |
2384 | * |
2385 | * Called by regulator drivers to notify clients a regulator event has | |
2386 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2387 | * Note lock must be held by caller. |
414c70cb LG |
2388 | */ |
2389 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2390 | unsigned long event, void *data) | |
2391 | { | |
2392 | _notifier_call_chain(rdev, event, data); | |
2393 | return NOTIFY_DONE; | |
2394 | ||
2395 | } | |
2396 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2397 | ||
be721979 MB |
2398 | /** |
2399 | * regulator_mode_to_status - convert a regulator mode into a status | |
2400 | * | |
2401 | * @mode: Mode to convert | |
2402 | * | |
2403 | * Convert a regulator mode into a status. | |
2404 | */ | |
2405 | int regulator_mode_to_status(unsigned int mode) | |
2406 | { | |
2407 | switch (mode) { | |
2408 | case REGULATOR_MODE_FAST: | |
2409 | return REGULATOR_STATUS_FAST; | |
2410 | case REGULATOR_MODE_NORMAL: | |
2411 | return REGULATOR_STATUS_NORMAL; | |
2412 | case REGULATOR_MODE_IDLE: | |
2413 | return REGULATOR_STATUS_IDLE; | |
2414 | case REGULATOR_STATUS_STANDBY: | |
2415 | return REGULATOR_STATUS_STANDBY; | |
2416 | default: | |
2417 | return 0; | |
2418 | } | |
2419 | } | |
2420 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2421 | ||
7ad68e2f DB |
2422 | /* |
2423 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2424 | * create attributes that can be meaningfully displayed. | |
2425 | */ | |
2426 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2427 | { | |
2428 | struct device *dev = &rdev->dev; | |
2429 | struct regulator_ops *ops = rdev->desc->ops; | |
2430 | int status = 0; | |
2431 | ||
2432 | /* some attributes need specific methods to be displayed */ | |
476c2d83 | 2433 | if (ops->get_voltage || ops->get_voltage_sel) { |
7ad68e2f DB |
2434 | status = device_create_file(dev, &dev_attr_microvolts); |
2435 | if (status < 0) | |
2436 | return status; | |
2437 | } | |
2438 | if (ops->get_current_limit) { | |
2439 | status = device_create_file(dev, &dev_attr_microamps); | |
2440 | if (status < 0) | |
2441 | return status; | |
2442 | } | |
2443 | if (ops->get_mode) { | |
2444 | status = device_create_file(dev, &dev_attr_opmode); | |
2445 | if (status < 0) | |
2446 | return status; | |
2447 | } | |
2448 | if (ops->is_enabled) { | |
2449 | status = device_create_file(dev, &dev_attr_state); | |
2450 | if (status < 0) | |
2451 | return status; | |
2452 | } | |
853116a1 DB |
2453 | if (ops->get_status) { |
2454 | status = device_create_file(dev, &dev_attr_status); | |
2455 | if (status < 0) | |
2456 | return status; | |
2457 | } | |
7ad68e2f DB |
2458 | |
2459 | /* some attributes are type-specific */ | |
2460 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2461 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2462 | if (status < 0) | |
2463 | return status; | |
2464 | } | |
2465 | ||
2466 | /* all the other attributes exist to support constraints; | |
2467 | * don't show them if there are no constraints, or if the | |
2468 | * relevant supporting methods are missing. | |
2469 | */ | |
2470 | if (!rdev->constraints) | |
2471 | return status; | |
2472 | ||
2473 | /* constraints need specific supporting methods */ | |
e8eef82b | 2474 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2475 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2476 | if (status < 0) | |
2477 | return status; | |
2478 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2479 | if (status < 0) | |
2480 | return status; | |
2481 | } | |
2482 | if (ops->set_current_limit) { | |
2483 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2484 | if (status < 0) | |
2485 | return status; | |
2486 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2487 | if (status < 0) | |
2488 | return status; | |
2489 | } | |
2490 | ||
2491 | /* suspend mode constraints need multiple supporting methods */ | |
2492 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2493 | return status; | |
2494 | ||
2495 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2496 | if (status < 0) | |
2497 | return status; | |
2498 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2499 | if (status < 0) | |
2500 | return status; | |
2501 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2502 | if (status < 0) | |
2503 | return status; | |
2504 | ||
2505 | if (ops->set_suspend_voltage) { | |
2506 | status = device_create_file(dev, | |
2507 | &dev_attr_suspend_standby_microvolts); | |
2508 | if (status < 0) | |
2509 | return status; | |
2510 | status = device_create_file(dev, | |
2511 | &dev_attr_suspend_mem_microvolts); | |
2512 | if (status < 0) | |
2513 | return status; | |
2514 | status = device_create_file(dev, | |
2515 | &dev_attr_suspend_disk_microvolts); | |
2516 | if (status < 0) | |
2517 | return status; | |
2518 | } | |
2519 | ||
2520 | if (ops->set_suspend_mode) { | |
2521 | status = device_create_file(dev, | |
2522 | &dev_attr_suspend_standby_mode); | |
2523 | if (status < 0) | |
2524 | return status; | |
2525 | status = device_create_file(dev, | |
2526 | &dev_attr_suspend_mem_mode); | |
2527 | if (status < 0) | |
2528 | return status; | |
2529 | status = device_create_file(dev, | |
2530 | &dev_attr_suspend_disk_mode); | |
2531 | if (status < 0) | |
2532 | return status; | |
2533 | } | |
2534 | ||
2535 | return status; | |
2536 | } | |
2537 | ||
1130e5b3 MB |
2538 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
2539 | { | |
2540 | #ifdef CONFIG_DEBUG_FS | |
2541 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); | |
2542 | if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { | |
2543 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
2544 | rdev->debugfs = NULL; | |
2545 | return; | |
2546 | } | |
2547 | ||
2548 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
2549 | &rdev->use_count); | |
2550 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
2551 | &rdev->open_count); | |
2552 | #endif | |
2553 | } | |
2554 | ||
414c70cb LG |
2555 | /** |
2556 | * regulator_register - register regulator | |
69279fb9 MB |
2557 | * @regulator_desc: regulator to register |
2558 | * @dev: struct device for the regulator | |
0527100f | 2559 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2560 | * @driver_data: private regulator data |
414c70cb LG |
2561 | * |
2562 | * Called by regulator drivers to register a regulator. | |
2563 | * Returns 0 on success. | |
2564 | */ | |
2565 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2566 | struct device *dev, const struct regulator_init_data *init_data, |
0527100f | 2567 | void *driver_data) |
414c70cb LG |
2568 | { |
2569 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2570 | struct regulator_dev *rdev; | |
a5766f11 | 2571 | int ret, i; |
414c70cb LG |
2572 | |
2573 | if (regulator_desc == NULL) | |
2574 | return ERR_PTR(-EINVAL); | |
2575 | ||
2576 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2577 | return ERR_PTR(-EINVAL); | |
2578 | ||
cd78dfc6 DL |
2579 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2580 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2581 | return ERR_PTR(-EINVAL); |
2582 | ||
46fabe1e MB |
2583 | if (!init_data) |
2584 | return ERR_PTR(-EINVAL); | |
2585 | ||
476c2d83 MB |
2586 | /* Only one of each should be implemented */ |
2587 | WARN_ON(regulator_desc->ops->get_voltage && | |
2588 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
2589 | WARN_ON(regulator_desc->ops->set_voltage && |
2590 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
2591 | |
2592 | /* If we're using selectors we must implement list_voltage. */ | |
2593 | if (regulator_desc->ops->get_voltage_sel && | |
2594 | !regulator_desc->ops->list_voltage) { | |
2595 | return ERR_PTR(-EINVAL); | |
2596 | } | |
e8eef82b MB |
2597 | if (regulator_desc->ops->set_voltage_sel && |
2598 | !regulator_desc->ops->list_voltage) { | |
2599 | return ERR_PTR(-EINVAL); | |
2600 | } | |
476c2d83 | 2601 | |
414c70cb LG |
2602 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2603 | if (rdev == NULL) | |
2604 | return ERR_PTR(-ENOMEM); | |
2605 | ||
2606 | mutex_lock(®ulator_list_mutex); | |
2607 | ||
2608 | mutex_init(&rdev->mutex); | |
a5766f11 | 2609 | rdev->reg_data = driver_data; |
414c70cb LG |
2610 | rdev->owner = regulator_desc->owner; |
2611 | rdev->desc = regulator_desc; | |
2612 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2613 | INIT_LIST_HEAD(&rdev->supply_list); | |
2614 | INIT_LIST_HEAD(&rdev->list); | |
2615 | INIT_LIST_HEAD(&rdev->slist); | |
2616 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2617 | ||
a5766f11 LG |
2618 | /* preform any regulator specific init */ |
2619 | if (init_data->regulator_init) { | |
2620 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2621 | if (ret < 0) |
2622 | goto clean; | |
a5766f11 LG |
2623 | } |
2624 | ||
a5766f11 | 2625 | /* register with sysfs */ |
414c70cb | 2626 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2627 | rdev->dev.parent = dev; |
812460a9 KS |
2628 | dev_set_name(&rdev->dev, "regulator.%d", |
2629 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2630 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2631 | if (ret != 0) { |
2632 | put_device(&rdev->dev); | |
4fca9545 | 2633 | goto clean; |
ad7725cb | 2634 | } |
a5766f11 LG |
2635 | |
2636 | dev_set_drvdata(&rdev->dev, rdev); | |
2637 | ||
74f544c1 MR |
2638 | /* set regulator constraints */ |
2639 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2640 | if (ret < 0) | |
2641 | goto scrub; | |
2642 | ||
7ad68e2f DB |
2643 | /* add attributes supported by this regulator */ |
2644 | ret = add_regulator_attributes(rdev); | |
2645 | if (ret < 0) | |
2646 | goto scrub; | |
2647 | ||
0178f3e2 MB |
2648 | if (init_data->supply_regulator) { |
2649 | struct regulator_dev *r; | |
2650 | int found = 0; | |
2651 | ||
2652 | list_for_each_entry(r, ®ulator_list, list) { | |
2653 | if (strcmp(rdev_get_name(r), | |
2654 | init_data->supply_regulator) == 0) { | |
2655 | found = 1; | |
2656 | break; | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | if (!found) { | |
2661 | dev_err(dev, "Failed to find supply %s\n", | |
2662 | init_data->supply_regulator); | |
7727da22 | 2663 | ret = -ENODEV; |
0178f3e2 MB |
2664 | goto scrub; |
2665 | } | |
2666 | ||
2667 | ret = set_supply(rdev, r); | |
2668 | if (ret < 0) | |
2669 | goto scrub; | |
2670 | } | |
2671 | ||
a5766f11 LG |
2672 | /* add consumers devices */ |
2673 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2674 | ret = set_consumer_device_supply(rdev, | |
2675 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2676 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2677 | init_data->consumer_supplies[i].supply); |
23c2f041 MB |
2678 | if (ret < 0) { |
2679 | dev_err(dev, "Failed to set supply %s\n", | |
2680 | init_data->consumer_supplies[i].supply); | |
d4033b54 | 2681 | goto unset_supplies; |
23c2f041 | 2682 | } |
414c70cb | 2683 | } |
a5766f11 LG |
2684 | |
2685 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
2686 | |
2687 | rdev_init_debugfs(rdev); | |
a5766f11 | 2688 | out: |
414c70cb LG |
2689 | mutex_unlock(®ulator_list_mutex); |
2690 | return rdev; | |
4fca9545 | 2691 | |
d4033b54 JN |
2692 | unset_supplies: |
2693 | unset_regulator_supplies(rdev); | |
2694 | ||
4fca9545 DB |
2695 | scrub: |
2696 | device_unregister(&rdev->dev); | |
53032daf PW |
2697 | /* device core frees rdev */ |
2698 | rdev = ERR_PTR(ret); | |
2699 | goto out; | |
2700 | ||
4fca9545 DB |
2701 | clean: |
2702 | kfree(rdev); | |
2703 | rdev = ERR_PTR(ret); | |
2704 | goto out; | |
414c70cb LG |
2705 | } |
2706 | EXPORT_SYMBOL_GPL(regulator_register); | |
2707 | ||
2708 | /** | |
2709 | * regulator_unregister - unregister regulator | |
69279fb9 | 2710 | * @rdev: regulator to unregister |
414c70cb LG |
2711 | * |
2712 | * Called by regulator drivers to unregister a regulator. | |
2713 | */ | |
2714 | void regulator_unregister(struct regulator_dev *rdev) | |
2715 | { | |
2716 | if (rdev == NULL) | |
2717 | return; | |
2718 | ||
2719 | mutex_lock(®ulator_list_mutex); | |
1130e5b3 MB |
2720 | #ifdef CONFIG_DEBUG_FS |
2721 | debugfs_remove_recursive(rdev->debugfs); | |
2722 | #endif | |
6bf87d17 | 2723 | WARN_ON(rdev->open_count); |
0f1d747b | 2724 | unset_regulator_supplies(rdev); |
414c70cb LG |
2725 | list_del(&rdev->list); |
2726 | if (rdev->supply) | |
2727 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2728 | device_unregister(&rdev->dev); | |
f8c12fe3 | 2729 | kfree(rdev->constraints); |
414c70cb LG |
2730 | mutex_unlock(®ulator_list_mutex); |
2731 | } | |
2732 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2733 | ||
414c70cb | 2734 | /** |
cf7bbcdf | 2735 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2736 | * @state: system suspend state |
2737 | * | |
2738 | * Configure each regulator with it's suspend operating parameters for state. | |
2739 | * This will usually be called by machine suspend code prior to supending. | |
2740 | */ | |
2741 | int regulator_suspend_prepare(suspend_state_t state) | |
2742 | { | |
2743 | struct regulator_dev *rdev; | |
2744 | int ret = 0; | |
2745 | ||
2746 | /* ON is handled by regulator active state */ | |
2747 | if (state == PM_SUSPEND_ON) | |
2748 | return -EINVAL; | |
2749 | ||
2750 | mutex_lock(®ulator_list_mutex); | |
2751 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2752 | ||
2753 | mutex_lock(&rdev->mutex); | |
2754 | ret = suspend_prepare(rdev, state); | |
2755 | mutex_unlock(&rdev->mutex); | |
2756 | ||
2757 | if (ret < 0) { | |
5da84fd9 | 2758 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2759 | goto out; |
2760 | } | |
2761 | } | |
2762 | out: | |
2763 | mutex_unlock(®ulator_list_mutex); | |
2764 | return ret; | |
2765 | } | |
2766 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2767 | ||
7a32b589 MH |
2768 | /** |
2769 | * regulator_suspend_finish - resume regulators from system wide suspend | |
2770 | * | |
2771 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
2772 | * and that should be turned on according to the regulators properties. | |
2773 | */ | |
2774 | int regulator_suspend_finish(void) | |
2775 | { | |
2776 | struct regulator_dev *rdev; | |
2777 | int ret = 0, error; | |
2778 | ||
2779 | mutex_lock(®ulator_list_mutex); | |
2780 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2781 | struct regulator_ops *ops = rdev->desc->ops; | |
2782 | ||
2783 | mutex_lock(&rdev->mutex); | |
2784 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
2785 | ops->enable) { | |
2786 | error = ops->enable(rdev); | |
2787 | if (error) | |
2788 | ret = error; | |
2789 | } else { | |
2790 | if (!has_full_constraints) | |
2791 | goto unlock; | |
2792 | if (!ops->disable) | |
2793 | goto unlock; | |
2794 | if (ops->is_enabled && !ops->is_enabled(rdev)) | |
2795 | goto unlock; | |
2796 | ||
2797 | error = ops->disable(rdev); | |
2798 | if (error) | |
2799 | ret = error; | |
2800 | } | |
2801 | unlock: | |
2802 | mutex_unlock(&rdev->mutex); | |
2803 | } | |
2804 | mutex_unlock(®ulator_list_mutex); | |
2805 | return ret; | |
2806 | } | |
2807 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
2808 | ||
ca725561 MB |
2809 | /** |
2810 | * regulator_has_full_constraints - the system has fully specified constraints | |
2811 | * | |
2812 | * Calling this function will cause the regulator API to disable all | |
2813 | * regulators which have a zero use count and don't have an always_on | |
2814 | * constraint in a late_initcall. | |
2815 | * | |
2816 | * The intention is that this will become the default behaviour in a | |
2817 | * future kernel release so users are encouraged to use this facility | |
2818 | * now. | |
2819 | */ | |
2820 | void regulator_has_full_constraints(void) | |
2821 | { | |
2822 | has_full_constraints = 1; | |
2823 | } | |
2824 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2825 | ||
688fe99a MB |
2826 | /** |
2827 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2828 | * | |
2829 | * Calling this function will cause the regulator API to provide a | |
2830 | * dummy regulator to consumers if no physical regulator is found, | |
2831 | * allowing most consumers to proceed as though a regulator were | |
2832 | * configured. This allows systems such as those with software | |
2833 | * controllable regulators for the CPU core only to be brought up more | |
2834 | * readily. | |
2835 | */ | |
2836 | void regulator_use_dummy_regulator(void) | |
2837 | { | |
2838 | board_wants_dummy_regulator = true; | |
2839 | } | |
2840 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2841 | ||
414c70cb LG |
2842 | /** |
2843 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2844 | * @rdev: regulator |
414c70cb LG |
2845 | * |
2846 | * Get rdev regulator driver private data. This call can be used in the | |
2847 | * regulator driver context. | |
2848 | */ | |
2849 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2850 | { | |
2851 | return rdev->reg_data; | |
2852 | } | |
2853 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2854 | ||
2855 | /** | |
2856 | * regulator_get_drvdata - get regulator driver data | |
2857 | * @regulator: regulator | |
2858 | * | |
2859 | * Get regulator driver private data. This call can be used in the consumer | |
2860 | * driver context when non API regulator specific functions need to be called. | |
2861 | */ | |
2862 | void *regulator_get_drvdata(struct regulator *regulator) | |
2863 | { | |
2864 | return regulator->rdev->reg_data; | |
2865 | } | |
2866 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2867 | ||
2868 | /** | |
2869 | * regulator_set_drvdata - set regulator driver data | |
2870 | * @regulator: regulator | |
2871 | * @data: data | |
2872 | */ | |
2873 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2874 | { | |
2875 | regulator->rdev->reg_data = data; | |
2876 | } | |
2877 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2878 | ||
2879 | /** | |
2880 | * regulator_get_id - get regulator ID | |
69279fb9 | 2881 | * @rdev: regulator |
414c70cb LG |
2882 | */ |
2883 | int rdev_get_id(struct regulator_dev *rdev) | |
2884 | { | |
2885 | return rdev->desc->id; | |
2886 | } | |
2887 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2888 | ||
a5766f11 LG |
2889 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2890 | { | |
2891 | return &rdev->dev; | |
2892 | } | |
2893 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2894 | ||
2895 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2896 | { | |
2897 | return reg_init_data->driver_data; | |
2898 | } | |
2899 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2900 | ||
414c70cb LG |
2901 | static int __init regulator_init(void) |
2902 | { | |
34abbd68 MB |
2903 | int ret; |
2904 | ||
34abbd68 MB |
2905 | ret = class_register(®ulator_class); |
2906 | ||
1130e5b3 MB |
2907 | #ifdef CONFIG_DEBUG_FS |
2908 | debugfs_root = debugfs_create_dir("regulator", NULL); | |
2909 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
2910 | pr_warn("regulator: Failed to create debugfs directory\n"); | |
2911 | debugfs_root = NULL; | |
2912 | } | |
2913 | #endif | |
2914 | ||
34abbd68 MB |
2915 | regulator_dummy_init(); |
2916 | ||
2917 | return ret; | |
414c70cb LG |
2918 | } |
2919 | ||
2920 | /* init early to allow our consumers to complete system booting */ | |
2921 | core_initcall(regulator_init); | |
ca725561 MB |
2922 | |
2923 | static int __init regulator_init_complete(void) | |
2924 | { | |
2925 | struct regulator_dev *rdev; | |
2926 | struct regulator_ops *ops; | |
2927 | struct regulation_constraints *c; | |
2928 | int enabled, ret; | |
ca725561 MB |
2929 | |
2930 | mutex_lock(®ulator_list_mutex); | |
2931 | ||
2932 | /* If we have a full configuration then disable any regulators | |
2933 | * which are not in use or always_on. This will become the | |
2934 | * default behaviour in the future. | |
2935 | */ | |
2936 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2937 | ops = rdev->desc->ops; | |
2938 | c = rdev->constraints; | |
2939 | ||
f25e0b4f | 2940 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2941 | continue; |
2942 | ||
2943 | mutex_lock(&rdev->mutex); | |
2944 | ||
2945 | if (rdev->use_count) | |
2946 | goto unlock; | |
2947 | ||
2948 | /* If we can't read the status assume it's on. */ | |
2949 | if (ops->is_enabled) | |
2950 | enabled = ops->is_enabled(rdev); | |
2951 | else | |
2952 | enabled = 1; | |
2953 | ||
2954 | if (!enabled) | |
2955 | goto unlock; | |
2956 | ||
2957 | if (has_full_constraints) { | |
2958 | /* We log since this may kill the system if it | |
2959 | * goes wrong. */ | |
5da84fd9 | 2960 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
2961 | ret = ops->disable(rdev); |
2962 | if (ret != 0) { | |
5da84fd9 | 2963 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
2964 | } |
2965 | } else { | |
2966 | /* The intention is that in future we will | |
2967 | * assume that full constraints are provided | |
2968 | * so warn even if we aren't going to do | |
2969 | * anything here. | |
2970 | */ | |
5da84fd9 | 2971 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
2972 | } |
2973 | ||
2974 | unlock: | |
2975 | mutex_unlock(&rdev->mutex); | |
2976 | } | |
2977 | ||
2978 | mutex_unlock(®ulator_list_mutex); | |
2979 | ||
2980 | return 0; | |
2981 | } | |
2982 | late_initcall(regulator_init_complete); |