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