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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
1d7372e1 | 16 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
c5e28ed7 | 17 | |
414c70cb LG |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
1130e5b3 | 20 | #include <linux/debugfs.h> |
414c70cb | 21 | #include <linux/device.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
f21e0e81 | 23 | #include <linux/async.h> |
414c70cb LG |
24 | #include <linux/err.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/suspend.h> | |
31aae2be | 27 | #include <linux/delay.h> |
414c70cb LG |
28 | #include <linux/regulator/consumer.h> |
29 | #include <linux/regulator/driver.h> | |
30 | #include <linux/regulator/machine.h> | |
31 | ||
02fa3ec0 MB |
32 | #define CREATE_TRACE_POINTS |
33 | #include <trace/events/regulator.h> | |
34 | ||
34abbd68 MB |
35 | #include "dummy.h" |
36 | ||
7d51a0db MB |
37 | #define rdev_crit(rdev, fmt, ...) \ |
38 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
39 | #define rdev_err(rdev, fmt, ...) \ |
40 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
41 | #define rdev_warn(rdev, fmt, ...) \ | |
42 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
43 | #define rdev_info(rdev, fmt, ...) \ | |
44 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
45 | #define rdev_dbg(rdev, fmt, ...) \ | |
46 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
47 | ||
414c70cb LG |
48 | static DEFINE_MUTEX(regulator_list_mutex); |
49 | static LIST_HEAD(regulator_list); | |
50 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 51 | static bool has_full_constraints; |
688fe99a | 52 | static bool board_wants_dummy_regulator; |
414c70cb | 53 | |
1130e5b3 MB |
54 | #ifdef CONFIG_DEBUG_FS |
55 | static struct dentry *debugfs_root; | |
56 | #endif | |
57 | ||
8dc5390d | 58 | /* |
414c70cb LG |
59 | * struct regulator_map |
60 | * | |
61 | * Used to provide symbolic supply names to devices. | |
62 | */ | |
63 | struct regulator_map { | |
64 | struct list_head list; | |
40f9244f | 65 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 66 | const char *supply; |
a5766f11 | 67 | struct regulator_dev *regulator; |
414c70cb LG |
68 | }; |
69 | ||
414c70cb LG |
70 | /* |
71 | * struct regulator | |
72 | * | |
73 | * One for each consumer device. | |
74 | */ | |
75 | struct regulator { | |
76 | struct device *dev; | |
77 | struct list_head list; | |
78 | int uA_load; | |
79 | int min_uV; | |
80 | int max_uV; | |
414c70cb LG |
81 | char *supply_name; |
82 | struct device_attribute dev_attr; | |
83 | struct regulator_dev *rdev; | |
5de70519 MB |
84 | #ifdef CONFIG_DEBUG_FS |
85 | struct dentry *debugfs; | |
86 | #endif | |
414c70cb LG |
87 | }; |
88 | ||
89 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 90 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
91 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
92 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
93 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
94 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
95 | unsigned long event, void *data); | |
75790251 MB |
96 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
97 | int min_uV, int max_uV); | |
3801b86a MB |
98 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
99 | struct device *dev, | |
100 | const char *supply_name); | |
414c70cb | 101 | |
1083c393 MB |
102 | static const char *rdev_get_name(struct regulator_dev *rdev) |
103 | { | |
104 | if (rdev->constraints && rdev->constraints->name) | |
105 | return rdev->constraints->name; | |
106 | else if (rdev->desc->name) | |
107 | return rdev->desc->name; | |
108 | else | |
109 | return ""; | |
110 | } | |
111 | ||
414c70cb LG |
112 | /* gets the regulator for a given consumer device */ |
113 | static struct regulator *get_device_regulator(struct device *dev) | |
114 | { | |
115 | struct regulator *regulator = NULL; | |
116 | struct regulator_dev *rdev; | |
117 | ||
118 | mutex_lock(®ulator_list_mutex); | |
119 | list_for_each_entry(rdev, ®ulator_list, list) { | |
120 | mutex_lock(&rdev->mutex); | |
121 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
122 | if (regulator->dev == dev) { | |
123 | mutex_unlock(&rdev->mutex); | |
124 | mutex_unlock(®ulator_list_mutex); | |
125 | return regulator; | |
126 | } | |
127 | } | |
128 | mutex_unlock(&rdev->mutex); | |
129 | } | |
130 | mutex_unlock(®ulator_list_mutex); | |
131 | return NULL; | |
132 | } | |
133 | ||
134 | /* Platform voltage constraint check */ | |
135 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
136 | int *min_uV, int *max_uV) | |
137 | { | |
138 | BUG_ON(*min_uV > *max_uV); | |
139 | ||
140 | if (!rdev->constraints) { | |
5da84fd9 | 141 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
142 | return -ENODEV; |
143 | } | |
144 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 145 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
146 | return -EPERM; |
147 | } | |
148 | ||
149 | if (*max_uV > rdev->constraints->max_uV) | |
150 | *max_uV = rdev->constraints->max_uV; | |
151 | if (*min_uV < rdev->constraints->min_uV) | |
152 | *min_uV = rdev->constraints->min_uV; | |
153 | ||
89f425ed MB |
154 | if (*min_uV > *max_uV) { |
155 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
156 | min_uV, max_uV); | |
414c70cb | 157 | return -EINVAL; |
89f425ed | 158 | } |
414c70cb LG |
159 | |
160 | return 0; | |
161 | } | |
162 | ||
05fda3b1 TP |
163 | /* Make sure we select a voltage that suits the needs of all |
164 | * regulator consumers | |
165 | */ | |
166 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
167 | int *min_uV, int *max_uV) | |
168 | { | |
169 | struct regulator *regulator; | |
170 | ||
171 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
172 | /* |
173 | * Assume consumers that didn't say anything are OK | |
174 | * with anything in the constraint range. | |
175 | */ | |
176 | if (!regulator->min_uV && !regulator->max_uV) | |
177 | continue; | |
178 | ||
05fda3b1 TP |
179 | if (*max_uV > regulator->max_uV) |
180 | *max_uV = regulator->max_uV; | |
181 | if (*min_uV < regulator->min_uV) | |
182 | *min_uV = regulator->min_uV; | |
183 | } | |
184 | ||
185 | if (*min_uV > *max_uV) | |
186 | return -EINVAL; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
414c70cb LG |
191 | /* current constraint check */ |
192 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
193 | int *min_uA, int *max_uA) | |
194 | { | |
195 | BUG_ON(*min_uA > *max_uA); | |
196 | ||
197 | if (!rdev->constraints) { | |
5da84fd9 | 198 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
199 | return -ENODEV; |
200 | } | |
201 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 202 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
203 | return -EPERM; |
204 | } | |
205 | ||
206 | if (*max_uA > rdev->constraints->max_uA) | |
207 | *max_uA = rdev->constraints->max_uA; | |
208 | if (*min_uA < rdev->constraints->min_uA) | |
209 | *min_uA = rdev->constraints->min_uA; | |
210 | ||
89f425ed MB |
211 | if (*min_uA > *max_uA) { |
212 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
213 | min_uA, max_uA); | |
414c70cb | 214 | return -EINVAL; |
89f425ed | 215 | } |
414c70cb LG |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* operating mode constraint check */ | |
2c608234 | 221 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 222 | { |
2c608234 | 223 | switch (*mode) { |
e573520b DB |
224 | case REGULATOR_MODE_FAST: |
225 | case REGULATOR_MODE_NORMAL: | |
226 | case REGULATOR_MODE_IDLE: | |
227 | case REGULATOR_MODE_STANDBY: | |
228 | break; | |
229 | default: | |
89f425ed | 230 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
231 | return -EINVAL; |
232 | } | |
233 | ||
414c70cb | 234 | if (!rdev->constraints) { |
5da84fd9 | 235 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
236 | return -ENODEV; |
237 | } | |
238 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 239 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
240 | return -EPERM; |
241 | } | |
2c608234 MB |
242 | |
243 | /* The modes are bitmasks, the most power hungry modes having | |
244 | * the lowest values. If the requested mode isn't supported | |
245 | * try higher modes. */ | |
246 | while (*mode) { | |
247 | if (rdev->constraints->valid_modes_mask & *mode) | |
248 | return 0; | |
249 | *mode /= 2; | |
414c70cb | 250 | } |
2c608234 MB |
251 | |
252 | return -EINVAL; | |
414c70cb LG |
253 | } |
254 | ||
255 | /* dynamic regulator mode switching constraint check */ | |
256 | static int regulator_check_drms(struct regulator_dev *rdev) | |
257 | { | |
258 | if (!rdev->constraints) { | |
5da84fd9 | 259 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
260 | return -ENODEV; |
261 | } | |
262 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 263 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
264 | return -EPERM; |
265 | } | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static ssize_t device_requested_uA_show(struct device *dev, | |
270 | struct device_attribute *attr, char *buf) | |
271 | { | |
272 | struct regulator *regulator; | |
273 | ||
274 | regulator = get_device_regulator(dev); | |
275 | if (regulator == NULL) | |
276 | return 0; | |
277 | ||
278 | return sprintf(buf, "%d\n", regulator->uA_load); | |
279 | } | |
280 | ||
281 | static ssize_t regulator_uV_show(struct device *dev, | |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
a5766f11 | 284 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
285 | ssize_t ret; |
286 | ||
287 | mutex_lock(&rdev->mutex); | |
288 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
289 | mutex_unlock(&rdev->mutex); | |
290 | ||
291 | return ret; | |
292 | } | |
7ad68e2f | 293 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
294 | |
295 | static ssize_t regulator_uA_show(struct device *dev, | |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
a5766f11 | 298 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
299 | |
300 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
301 | } | |
7ad68e2f | 302 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 303 | |
bc558a60 MB |
304 | static ssize_t regulator_name_show(struct device *dev, |
305 | struct device_attribute *attr, char *buf) | |
306 | { | |
307 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 308 | |
1083c393 | 309 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
310 | } |
311 | ||
4fca9545 | 312 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 313 | { |
414c70cb LG |
314 | switch (mode) { |
315 | case REGULATOR_MODE_FAST: | |
316 | return sprintf(buf, "fast\n"); | |
317 | case REGULATOR_MODE_NORMAL: | |
318 | return sprintf(buf, "normal\n"); | |
319 | case REGULATOR_MODE_IDLE: | |
320 | return sprintf(buf, "idle\n"); | |
321 | case REGULATOR_MODE_STANDBY: | |
322 | return sprintf(buf, "standby\n"); | |
323 | } | |
324 | return sprintf(buf, "unknown\n"); | |
325 | } | |
326 | ||
4fca9545 DB |
327 | static ssize_t regulator_opmode_show(struct device *dev, |
328 | struct device_attribute *attr, char *buf) | |
414c70cb | 329 | { |
a5766f11 | 330 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 331 | |
4fca9545 DB |
332 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
333 | } | |
7ad68e2f | 334 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
335 | |
336 | static ssize_t regulator_print_state(char *buf, int state) | |
337 | { | |
414c70cb LG |
338 | if (state > 0) |
339 | return sprintf(buf, "enabled\n"); | |
340 | else if (state == 0) | |
341 | return sprintf(buf, "disabled\n"); | |
342 | else | |
343 | return sprintf(buf, "unknown\n"); | |
344 | } | |
345 | ||
4fca9545 DB |
346 | static ssize_t regulator_state_show(struct device *dev, |
347 | struct device_attribute *attr, char *buf) | |
348 | { | |
349 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
350 | ssize_t ret; |
351 | ||
352 | mutex_lock(&rdev->mutex); | |
353 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
354 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 355 | |
9332546f | 356 | return ret; |
4fca9545 | 357 | } |
7ad68e2f | 358 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 359 | |
853116a1 DB |
360 | static ssize_t regulator_status_show(struct device *dev, |
361 | struct device_attribute *attr, char *buf) | |
362 | { | |
363 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
364 | int status; | |
365 | char *label; | |
366 | ||
367 | status = rdev->desc->ops->get_status(rdev); | |
368 | if (status < 0) | |
369 | return status; | |
370 | ||
371 | switch (status) { | |
372 | case REGULATOR_STATUS_OFF: | |
373 | label = "off"; | |
374 | break; | |
375 | case REGULATOR_STATUS_ON: | |
376 | label = "on"; | |
377 | break; | |
378 | case REGULATOR_STATUS_ERROR: | |
379 | label = "error"; | |
380 | break; | |
381 | case REGULATOR_STATUS_FAST: | |
382 | label = "fast"; | |
383 | break; | |
384 | case REGULATOR_STATUS_NORMAL: | |
385 | label = "normal"; | |
386 | break; | |
387 | case REGULATOR_STATUS_IDLE: | |
388 | label = "idle"; | |
389 | break; | |
390 | case REGULATOR_STATUS_STANDBY: | |
391 | label = "standby"; | |
392 | break; | |
393 | default: | |
394 | return -ERANGE; | |
395 | } | |
396 | ||
397 | return sprintf(buf, "%s\n", label); | |
398 | } | |
399 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
400 | ||
414c70cb LG |
401 | static ssize_t regulator_min_uA_show(struct device *dev, |
402 | struct device_attribute *attr, char *buf) | |
403 | { | |
a5766f11 | 404 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
405 | |
406 | if (!rdev->constraints) | |
407 | return sprintf(buf, "constraint not defined\n"); | |
408 | ||
409 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
410 | } | |
7ad68e2f | 411 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
412 | |
413 | static ssize_t regulator_max_uA_show(struct device *dev, | |
414 | struct device_attribute *attr, char *buf) | |
415 | { | |
a5766f11 | 416 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
417 | |
418 | if (!rdev->constraints) | |
419 | return sprintf(buf, "constraint not defined\n"); | |
420 | ||
421 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
422 | } | |
7ad68e2f | 423 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
424 | |
425 | static ssize_t regulator_min_uV_show(struct device *dev, | |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
a5766f11 | 428 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
429 | |
430 | if (!rdev->constraints) | |
431 | return sprintf(buf, "constraint not defined\n"); | |
432 | ||
433 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
434 | } | |
7ad68e2f | 435 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
436 | |
437 | static ssize_t regulator_max_uV_show(struct device *dev, | |
438 | struct device_attribute *attr, char *buf) | |
439 | { | |
a5766f11 | 440 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
441 | |
442 | if (!rdev->constraints) | |
443 | return sprintf(buf, "constraint not defined\n"); | |
444 | ||
445 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
446 | } | |
7ad68e2f | 447 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
448 | |
449 | static ssize_t regulator_total_uA_show(struct device *dev, | |
450 | struct device_attribute *attr, char *buf) | |
451 | { | |
a5766f11 | 452 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
453 | struct regulator *regulator; |
454 | int uA = 0; | |
455 | ||
456 | mutex_lock(&rdev->mutex); | |
457 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 458 | uA += regulator->uA_load; |
414c70cb LG |
459 | mutex_unlock(&rdev->mutex); |
460 | return sprintf(buf, "%d\n", uA); | |
461 | } | |
7ad68e2f | 462 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
463 | |
464 | static ssize_t regulator_num_users_show(struct device *dev, | |
465 | struct device_attribute *attr, char *buf) | |
466 | { | |
a5766f11 | 467 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
468 | return sprintf(buf, "%d\n", rdev->use_count); |
469 | } | |
470 | ||
471 | static ssize_t regulator_type_show(struct device *dev, | |
472 | struct device_attribute *attr, char *buf) | |
473 | { | |
a5766f11 | 474 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
475 | |
476 | switch (rdev->desc->type) { | |
477 | case REGULATOR_VOLTAGE: | |
478 | return sprintf(buf, "voltage\n"); | |
479 | case REGULATOR_CURRENT: | |
480 | return sprintf(buf, "current\n"); | |
481 | } | |
482 | return sprintf(buf, "unknown\n"); | |
483 | } | |
484 | ||
485 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
486 | struct device_attribute *attr, char *buf) | |
487 | { | |
a5766f11 | 488 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 489 | |
414c70cb LG |
490 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
491 | } | |
7ad68e2f DB |
492 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
493 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
494 | |
495 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
496 | struct device_attribute *attr, char *buf) | |
497 | { | |
a5766f11 | 498 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 499 | |
414c70cb LG |
500 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
501 | } | |
7ad68e2f DB |
502 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
503 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
504 | |
505 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
506 | struct device_attribute *attr, char *buf) | |
507 | { | |
a5766f11 | 508 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 509 | |
414c70cb LG |
510 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
511 | } | |
7ad68e2f DB |
512 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
513 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 514 | |
414c70cb LG |
515 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
516 | struct device_attribute *attr, char *buf) | |
517 | { | |
a5766f11 | 518 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 519 | |
4fca9545 DB |
520 | return regulator_print_opmode(buf, |
521 | rdev->constraints->state_mem.mode); | |
414c70cb | 522 | } |
7ad68e2f DB |
523 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
524 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
525 | |
526 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
527 | struct device_attribute *attr, char *buf) | |
528 | { | |
a5766f11 | 529 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 530 | |
4fca9545 DB |
531 | return regulator_print_opmode(buf, |
532 | rdev->constraints->state_disk.mode); | |
414c70cb | 533 | } |
7ad68e2f DB |
534 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
535 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
536 | |
537 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
538 | struct device_attribute *attr, char *buf) | |
539 | { | |
a5766f11 | 540 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 541 | |
4fca9545 DB |
542 | return regulator_print_opmode(buf, |
543 | rdev->constraints->state_standby.mode); | |
414c70cb | 544 | } |
7ad68e2f DB |
545 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
546 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
547 | |
548 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
549 | struct device_attribute *attr, char *buf) | |
550 | { | |
a5766f11 | 551 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 552 | |
4fca9545 DB |
553 | return regulator_print_state(buf, |
554 | rdev->constraints->state_mem.enabled); | |
414c70cb | 555 | } |
7ad68e2f DB |
556 | static DEVICE_ATTR(suspend_mem_state, 0444, |
557 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
558 | |
559 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
560 | struct device_attribute *attr, char *buf) | |
561 | { | |
a5766f11 | 562 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 563 | |
4fca9545 DB |
564 | return regulator_print_state(buf, |
565 | rdev->constraints->state_disk.enabled); | |
414c70cb | 566 | } |
7ad68e2f DB |
567 | static DEVICE_ATTR(suspend_disk_state, 0444, |
568 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
569 | |
570 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
571 | struct device_attribute *attr, char *buf) | |
572 | { | |
a5766f11 | 573 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 574 | |
4fca9545 DB |
575 | return regulator_print_state(buf, |
576 | rdev->constraints->state_standby.enabled); | |
414c70cb | 577 | } |
7ad68e2f DB |
578 | static DEVICE_ATTR(suspend_standby_state, 0444, |
579 | regulator_suspend_standby_state_show, NULL); | |
580 | ||
bc558a60 | 581 | |
7ad68e2f DB |
582 | /* |
583 | * These are the only attributes are present for all regulators. | |
584 | * Other attributes are a function of regulator functionality. | |
585 | */ | |
414c70cb | 586 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 587 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
588 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
589 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
590 | __ATTR_NULL, |
591 | }; | |
592 | ||
593 | static void regulator_dev_release(struct device *dev) | |
594 | { | |
a5766f11 | 595 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
596 | kfree(rdev); |
597 | } | |
598 | ||
599 | static struct class regulator_class = { | |
600 | .name = "regulator", | |
601 | .dev_release = regulator_dev_release, | |
602 | .dev_attrs = regulator_dev_attrs, | |
603 | }; | |
604 | ||
605 | /* Calculate the new optimum regulator operating mode based on the new total | |
606 | * consumer load. All locks held by caller */ | |
607 | static void drms_uA_update(struct regulator_dev *rdev) | |
608 | { | |
609 | struct regulator *sibling; | |
610 | int current_uA = 0, output_uV, input_uV, err; | |
611 | unsigned int mode; | |
612 | ||
613 | err = regulator_check_drms(rdev); | |
614 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
615 | (!rdev->desc->ops->get_voltage && |
616 | !rdev->desc->ops->get_voltage_sel) || | |
617 | !rdev->desc->ops->set_mode) | |
036de8ef | 618 | return; |
414c70cb LG |
619 | |
620 | /* get output voltage */ | |
1bf5a1f8 | 621 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
622 | if (output_uV <= 0) |
623 | return; | |
624 | ||
625 | /* get input voltage */ | |
1bf5a1f8 MB |
626 | input_uV = 0; |
627 | if (rdev->supply) | |
628 | input_uV = _regulator_get_voltage(rdev); | |
629 | if (input_uV <= 0) | |
414c70cb LG |
630 | input_uV = rdev->constraints->input_uV; |
631 | if (input_uV <= 0) | |
632 | return; | |
633 | ||
634 | /* calc total requested load */ | |
635 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 636 | current_uA += sibling->uA_load; |
414c70cb LG |
637 | |
638 | /* now get the optimum mode for our new total regulator load */ | |
639 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
640 | output_uV, current_uA); | |
641 | ||
642 | /* check the new mode is allowed */ | |
2c608234 | 643 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
644 | if (err == 0) |
645 | rdev->desc->ops->set_mode(rdev, mode); | |
646 | } | |
647 | ||
648 | static int suspend_set_state(struct regulator_dev *rdev, | |
649 | struct regulator_state *rstate) | |
650 | { | |
651 | int ret = 0; | |
638f85c5 MB |
652 | bool can_set_state; |
653 | ||
654 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
655 | rdev->desc->ops->set_suspend_disable; | |
656 | ||
657 | /* If we have no suspend mode configration don't set anything; | |
658 | * only warn if the driver actually makes the suspend mode | |
659 | * configurable. | |
660 | */ | |
661 | if (!rstate->enabled && !rstate->disabled) { | |
662 | if (can_set_state) | |
5da84fd9 | 663 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
664 | return 0; |
665 | } | |
666 | ||
667 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 668 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
669 | return -EINVAL; |
670 | } | |
414c70cb | 671 | |
638f85c5 | 672 | if (!can_set_state) { |
5da84fd9 | 673 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 674 | return -EINVAL; |
a5766f11 | 675 | } |
414c70cb LG |
676 | |
677 | if (rstate->enabled) | |
678 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
679 | else | |
680 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
681 | if (ret < 0) { | |
5da84fd9 | 682 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
683 | return ret; |
684 | } | |
685 | ||
686 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
687 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
688 | if (ret < 0) { | |
5da84fd9 | 689 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
690 | return ret; |
691 | } | |
692 | } | |
693 | ||
694 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
695 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
696 | if (ret < 0) { | |
5da84fd9 | 697 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
698 | return ret; |
699 | } | |
700 | } | |
701 | return ret; | |
702 | } | |
703 | ||
704 | /* locks held by caller */ | |
705 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
706 | { | |
707 | if (!rdev->constraints) | |
708 | return -EINVAL; | |
709 | ||
710 | switch (state) { | |
711 | case PM_SUSPEND_STANDBY: | |
712 | return suspend_set_state(rdev, | |
713 | &rdev->constraints->state_standby); | |
714 | case PM_SUSPEND_MEM: | |
715 | return suspend_set_state(rdev, | |
716 | &rdev->constraints->state_mem); | |
717 | case PM_SUSPEND_MAX: | |
718 | return suspend_set_state(rdev, | |
719 | &rdev->constraints->state_disk); | |
720 | default: | |
721 | return -EINVAL; | |
722 | } | |
723 | } | |
724 | ||
725 | static void print_constraints(struct regulator_dev *rdev) | |
726 | { | |
727 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 728 | char buf[80] = ""; |
8f031b48 MB |
729 | int count = 0; |
730 | int ret; | |
414c70cb | 731 | |
8f031b48 | 732 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 733 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
734 | count += sprintf(buf + count, "%d mV ", |
735 | constraints->min_uV / 1000); | |
414c70cb | 736 | else |
8f031b48 MB |
737 | count += sprintf(buf + count, "%d <--> %d mV ", |
738 | constraints->min_uV / 1000, | |
739 | constraints->max_uV / 1000); | |
740 | } | |
741 | ||
742 | if (!constraints->min_uV || | |
743 | constraints->min_uV != constraints->max_uV) { | |
744 | ret = _regulator_get_voltage(rdev); | |
745 | if (ret > 0) | |
746 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
747 | } | |
748 | ||
bf5892a8 MB |
749 | if (constraints->uV_offset) |
750 | count += sprintf(buf, "%dmV offset ", | |
751 | constraints->uV_offset / 1000); | |
752 | ||
8f031b48 | 753 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 754 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
755 | count += sprintf(buf + count, "%d mA ", |
756 | constraints->min_uA / 1000); | |
414c70cb | 757 | else |
8f031b48 MB |
758 | count += sprintf(buf + count, "%d <--> %d mA ", |
759 | constraints->min_uA / 1000, | |
760 | constraints->max_uA / 1000); | |
761 | } | |
762 | ||
763 | if (!constraints->min_uA || | |
764 | constraints->min_uA != constraints->max_uA) { | |
765 | ret = _regulator_get_current_limit(rdev); | |
766 | if (ret > 0) | |
e4a6376b | 767 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 768 | } |
8f031b48 | 769 | |
414c70cb LG |
770 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
771 | count += sprintf(buf + count, "fast "); | |
772 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
773 | count += sprintf(buf + count, "normal "); | |
774 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
775 | count += sprintf(buf + count, "idle "); | |
776 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
777 | count += sprintf(buf + count, "standby"); | |
778 | ||
13ce29f8 | 779 | rdev_info(rdev, "%s\n", buf); |
414c70cb LG |
780 | } |
781 | ||
e79055d6 | 782 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 783 | struct regulation_constraints *constraints) |
a5766f11 | 784 | { |
e5fda26c | 785 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
786 | int ret; |
787 | ||
788 | /* do we need to apply the constraint voltage */ | |
789 | if (rdev->constraints->apply_uV && | |
75790251 MB |
790 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
791 | ret = _regulator_do_set_voltage(rdev, | |
792 | rdev->constraints->min_uV, | |
793 | rdev->constraints->max_uV); | |
794 | if (ret < 0) { | |
795 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
796 | rdev->constraints->min_uV); | |
75790251 MB |
797 | return ret; |
798 | } | |
af5866c9 | 799 | } |
e06f5b4f | 800 | |
4367cfdc DB |
801 | /* constrain machine-level voltage specs to fit |
802 | * the actual range supported by this regulator. | |
803 | */ | |
804 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
805 | int count = rdev->desc->n_voltages; | |
806 | int i; | |
807 | int min_uV = INT_MAX; | |
808 | int max_uV = INT_MIN; | |
809 | int cmin = constraints->min_uV; | |
810 | int cmax = constraints->max_uV; | |
811 | ||
3e590918 MB |
812 | /* it's safe to autoconfigure fixed-voltage supplies |
813 | and the constraints are used by list_voltage. */ | |
4367cfdc | 814 | if (count == 1 && !cmin) { |
3e590918 | 815 | cmin = 1; |
4367cfdc | 816 | cmax = INT_MAX; |
3e590918 MB |
817 | constraints->min_uV = cmin; |
818 | constraints->max_uV = cmax; | |
4367cfdc DB |
819 | } |
820 | ||
3e2b9abd MB |
821 | /* voltage constraints are optional */ |
822 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 823 | return 0; |
3e2b9abd | 824 | |
4367cfdc | 825 | /* else require explicit machine-level constraints */ |
3e2b9abd | 826 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 827 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 828 | return -EINVAL; |
4367cfdc DB |
829 | } |
830 | ||
831 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
832 | for (i = 0; i < count; i++) { | |
833 | int value; | |
834 | ||
835 | value = ops->list_voltage(rdev, i); | |
836 | if (value <= 0) | |
837 | continue; | |
838 | ||
839 | /* maybe adjust [min_uV..max_uV] */ | |
840 | if (value >= cmin && value < min_uV) | |
841 | min_uV = value; | |
842 | if (value <= cmax && value > max_uV) | |
843 | max_uV = value; | |
844 | } | |
845 | ||
846 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
847 | if (max_uV < min_uV) { | |
5da84fd9 | 848 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 849 | return -EINVAL; |
4367cfdc DB |
850 | } |
851 | ||
852 | /* use regulator's subset of machine constraints */ | |
853 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
854 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
855 | constraints->min_uV, min_uV); | |
4367cfdc DB |
856 | constraints->min_uV = min_uV; |
857 | } | |
858 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
859 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
860 | constraints->max_uV, max_uV); | |
4367cfdc DB |
861 | constraints->max_uV = max_uV; |
862 | } | |
863 | } | |
864 | ||
e79055d6 MB |
865 | return 0; |
866 | } | |
867 | ||
868 | /** | |
869 | * set_machine_constraints - sets regulator constraints | |
870 | * @rdev: regulator source | |
871 | * @constraints: constraints to apply | |
872 | * | |
873 | * Allows platform initialisation code to define and constrain | |
874 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
875 | * Constraints *must* be set by platform code in order for some | |
876 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
877 | * set_mode. | |
878 | */ | |
879 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 880 | const struct regulation_constraints *constraints) |
e79055d6 MB |
881 | { |
882 | int ret = 0; | |
e79055d6 MB |
883 | struct regulator_ops *ops = rdev->desc->ops; |
884 | ||
f8c12fe3 MB |
885 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
886 | GFP_KERNEL); | |
887 | if (!rdev->constraints) | |
888 | return -ENOMEM; | |
af5866c9 | 889 | |
f8c12fe3 | 890 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
891 | if (ret != 0) |
892 | goto out; | |
893 | ||
a5766f11 | 894 | /* do we need to setup our suspend state */ |
e06f5b4f | 895 | if (constraints->initial_state) { |
f8c12fe3 | 896 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 897 | if (ret < 0) { |
5da84fd9 | 898 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
899 | goto out; |
900 | } | |
901 | } | |
a5766f11 | 902 | |
a308466c MB |
903 | if (constraints->initial_mode) { |
904 | if (!ops->set_mode) { | |
5da84fd9 | 905 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
906 | ret = -EINVAL; |
907 | goto out; | |
908 | } | |
909 | ||
f8c12fe3 | 910 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 911 | if (ret < 0) { |
5da84fd9 | 912 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
913 | goto out; |
914 | } | |
915 | } | |
916 | ||
cacf90f2 MB |
917 | /* If the constraints say the regulator should be on at this point |
918 | * and we have control then make sure it is enabled. | |
919 | */ | |
f8c12fe3 MB |
920 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
921 | ops->enable) { | |
e5fda26c MB |
922 | ret = ops->enable(rdev); |
923 | if (ret < 0) { | |
5da84fd9 | 924 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
925 | goto out; |
926 | } | |
927 | } | |
928 | ||
a5766f11 | 929 | print_constraints(rdev); |
1a6958e7 | 930 | return 0; |
a5766f11 | 931 | out: |
1a6958e7 AL |
932 | kfree(rdev->constraints); |
933 | rdev->constraints = NULL; | |
a5766f11 LG |
934 | return ret; |
935 | } | |
936 | ||
937 | /** | |
938 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
939 | * @rdev: regulator name |
940 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
941 | * |
942 | * Called by platform initialisation code to set the supply regulator for this | |
943 | * regulator. This ensures that a regulators supply will also be enabled by the | |
944 | * core if it's child is enabled. | |
945 | */ | |
946 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 947 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
948 | { |
949 | int err; | |
950 | ||
3801b86a MB |
951 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
952 | ||
953 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
954 | if (IS_ERR(rdev->supply)) { | |
955 | err = PTR_ERR(rdev->supply); | |
956 | rdev->supply = NULL; | |
957 | return err; | |
a5766f11 | 958 | } |
3801b86a MB |
959 | |
960 | return 0; | |
a5766f11 LG |
961 | } |
962 | ||
963 | /** | |
06c63f93 | 964 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
965 | * @rdev: regulator source |
966 | * @consumer_dev: device the supply applies to | |
40f9244f | 967 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 968 | * @supply: symbolic name for supply |
a5766f11 LG |
969 | * |
970 | * Allows platform initialisation code to map physical regulator | |
971 | * sources to symbolic names for supplies for use by devices. Devices | |
972 | * should use these symbolic names to request regulators, avoiding the | |
973 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
974 | * |
975 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
976 | */ |
977 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
978 | struct device *consumer_dev, const char *consumer_dev_name, |
979 | const char *supply) | |
a5766f11 LG |
980 | { |
981 | struct regulator_map *node; | |
9ed2099e | 982 | int has_dev; |
a5766f11 | 983 | |
40f9244f MB |
984 | if (consumer_dev && consumer_dev_name) |
985 | return -EINVAL; | |
986 | ||
987 | if (!consumer_dev_name && consumer_dev) | |
988 | consumer_dev_name = dev_name(consumer_dev); | |
989 | ||
a5766f11 LG |
990 | if (supply == NULL) |
991 | return -EINVAL; | |
992 | ||
9ed2099e MB |
993 | if (consumer_dev_name != NULL) |
994 | has_dev = 1; | |
995 | else | |
996 | has_dev = 0; | |
997 | ||
6001e13c | 998 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
999 | if (node->dev_name && consumer_dev_name) { |
1000 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1001 | continue; | |
1002 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1003 | continue; |
23b5cc2a JN |
1004 | } |
1005 | ||
6001e13c DB |
1006 | if (strcmp(node->supply, supply) != 0) |
1007 | continue; | |
1008 | ||
1009 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
1010 | dev_name(&node->regulator->dev), |
1011 | node->regulator->desc->name, | |
1012 | supply, | |
1013 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1014 | return -EBUSY; |
1015 | } | |
1016 | ||
9ed2099e | 1017 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1018 | if (node == NULL) |
1019 | return -ENOMEM; | |
1020 | ||
1021 | node->regulator = rdev; | |
a5766f11 LG |
1022 | node->supply = supply; |
1023 | ||
9ed2099e MB |
1024 | if (has_dev) { |
1025 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1026 | if (node->dev_name == NULL) { | |
1027 | kfree(node); | |
1028 | return -ENOMEM; | |
1029 | } | |
40f9244f MB |
1030 | } |
1031 | ||
a5766f11 LG |
1032 | list_add(&node->list, ®ulator_map_list); |
1033 | return 0; | |
1034 | } | |
1035 | ||
0f1d747b MR |
1036 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1037 | { | |
1038 | struct regulator_map *node, *n; | |
1039 | ||
1040 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1041 | if (rdev == node->regulator) { | |
1042 | list_del(&node->list); | |
40f9244f | 1043 | kfree(node->dev_name); |
0f1d747b | 1044 | kfree(node); |
0f1d747b MR |
1045 | } |
1046 | } | |
1047 | } | |
1048 | ||
f5726ae3 | 1049 | #define REG_STR_SIZE 64 |
414c70cb LG |
1050 | |
1051 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1052 | struct device *dev, | |
1053 | const char *supply_name) | |
1054 | { | |
1055 | struct regulator *regulator; | |
1056 | char buf[REG_STR_SIZE]; | |
1057 | int err, size; | |
1058 | ||
1059 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1060 | if (regulator == NULL) | |
1061 | return NULL; | |
1062 | ||
1063 | mutex_lock(&rdev->mutex); | |
1064 | regulator->rdev = rdev; | |
1065 | list_add(®ulator->list, &rdev->consumer_list); | |
1066 | ||
1067 | if (dev) { | |
1068 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1069 | size = scnprintf(buf, REG_STR_SIZE, |
1070 | "microamps_requested_%s-%s", | |
1071 | dev_name(dev), supply_name); | |
414c70cb LG |
1072 | if (size >= REG_STR_SIZE) |
1073 | goto overflow_err; | |
1074 | ||
1075 | regulator->dev = dev; | |
4f26a2ab | 1076 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1077 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1078 | if (regulator->dev_attr.attr.name == NULL) | |
1079 | goto attr_name_err; | |
1080 | ||
414c70cb LG |
1081 | regulator->dev_attr.attr.mode = 0444; |
1082 | regulator->dev_attr.show = device_requested_uA_show; | |
1083 | err = device_create_file(dev, ®ulator->dev_attr); | |
1084 | if (err < 0) { | |
5da84fd9 | 1085 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1086 | goto attr_name_err; |
1087 | } | |
1088 | ||
1089 | /* also add a link to the device sysfs entry */ | |
1090 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1091 | dev->kobj.name, supply_name); | |
1092 | if (size >= REG_STR_SIZE) | |
1093 | goto attr_err; | |
1094 | ||
1095 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1096 | if (regulator->supply_name == NULL) | |
1097 | goto attr_err; | |
1098 | ||
1099 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1100 | buf); | |
1101 | if (err) { | |
5da84fd9 JP |
1102 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1103 | dev->kobj.name, err); | |
414c70cb LG |
1104 | goto link_name_err; |
1105 | } | |
5de70519 MB |
1106 | } else { |
1107 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1108 | if (regulator->supply_name == NULL) | |
1109 | goto attr_err; | |
1110 | } | |
1111 | ||
1112 | #ifdef CONFIG_DEBUG_FS | |
1113 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, | |
1114 | rdev->debugfs); | |
1115 | if (IS_ERR_OR_NULL(regulator->debugfs)) { | |
1116 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
1117 | regulator->debugfs = NULL; | |
1118 | } else { | |
1119 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1120 | ®ulator->uA_load); | |
1121 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1122 | ®ulator->min_uV); | |
1123 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1124 | ®ulator->max_uV); | |
414c70cb | 1125 | } |
5de70519 MB |
1126 | #endif |
1127 | ||
414c70cb LG |
1128 | mutex_unlock(&rdev->mutex); |
1129 | return regulator; | |
1130 | link_name_err: | |
1131 | kfree(regulator->supply_name); | |
1132 | attr_err: | |
1133 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1134 | attr_name_err: | |
1135 | kfree(regulator->dev_attr.attr.name); | |
1136 | overflow_err: | |
1137 | list_del(®ulator->list); | |
1138 | kfree(regulator); | |
1139 | mutex_unlock(&rdev->mutex); | |
1140 | return NULL; | |
1141 | } | |
1142 | ||
31aae2be MB |
1143 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1144 | { | |
1145 | if (!rdev->desc->ops->enable_time) | |
1146 | return 0; | |
1147 | return rdev->desc->ops->enable_time(rdev); | |
1148 | } | |
1149 | ||
5ffbd136 MB |
1150 | /* Internal regulator request function */ |
1151 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1152 | int exclusive) | |
414c70cb LG |
1153 | { |
1154 | struct regulator_dev *rdev; | |
1155 | struct regulator_map *map; | |
1156 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1157 | const char *devname = NULL; |
5ffbd136 | 1158 | int ret; |
414c70cb LG |
1159 | |
1160 | if (id == NULL) { | |
5da84fd9 | 1161 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1162 | return regulator; |
1163 | } | |
1164 | ||
40f9244f MB |
1165 | if (dev) |
1166 | devname = dev_name(dev); | |
1167 | ||
414c70cb LG |
1168 | mutex_lock(®ulator_list_mutex); |
1169 | ||
1170 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1171 | /* If the mapping has a device set up it must match */ |
1172 | if (map->dev_name && | |
1173 | (!devname || strcmp(map->dev_name, devname))) | |
1174 | continue; | |
1175 | ||
1176 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1177 | rdev = map->regulator; |
414c70cb | 1178 | goto found; |
a5766f11 | 1179 | } |
414c70cb | 1180 | } |
34abbd68 | 1181 | |
688fe99a MB |
1182 | if (board_wants_dummy_regulator) { |
1183 | rdev = dummy_regulator_rdev; | |
1184 | goto found; | |
1185 | } | |
1186 | ||
34abbd68 MB |
1187 | #ifdef CONFIG_REGULATOR_DUMMY |
1188 | if (!devname) | |
1189 | devname = "deviceless"; | |
1190 | ||
1191 | /* If the board didn't flag that it was fully constrained then | |
1192 | * substitute in a dummy regulator so consumers can continue. | |
1193 | */ | |
1194 | if (!has_full_constraints) { | |
5da84fd9 JP |
1195 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1196 | devname, id); | |
34abbd68 MB |
1197 | rdev = dummy_regulator_rdev; |
1198 | goto found; | |
1199 | } | |
1200 | #endif | |
1201 | ||
414c70cb LG |
1202 | mutex_unlock(®ulator_list_mutex); |
1203 | return regulator; | |
1204 | ||
1205 | found: | |
5ffbd136 MB |
1206 | if (rdev->exclusive) { |
1207 | regulator = ERR_PTR(-EPERM); | |
1208 | goto out; | |
1209 | } | |
1210 | ||
1211 | if (exclusive && rdev->open_count) { | |
1212 | regulator = ERR_PTR(-EBUSY); | |
1213 | goto out; | |
1214 | } | |
1215 | ||
a5766f11 LG |
1216 | if (!try_module_get(rdev->owner)) |
1217 | goto out; | |
1218 | ||
414c70cb LG |
1219 | regulator = create_regulator(rdev, dev, id); |
1220 | if (regulator == NULL) { | |
1221 | regulator = ERR_PTR(-ENOMEM); | |
1222 | module_put(rdev->owner); | |
1223 | } | |
1224 | ||
5ffbd136 MB |
1225 | rdev->open_count++; |
1226 | if (exclusive) { | |
1227 | rdev->exclusive = 1; | |
1228 | ||
1229 | ret = _regulator_is_enabled(rdev); | |
1230 | if (ret > 0) | |
1231 | rdev->use_count = 1; | |
1232 | else | |
1233 | rdev->use_count = 0; | |
1234 | } | |
1235 | ||
a5766f11 | 1236 | out: |
414c70cb | 1237 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1238 | |
414c70cb LG |
1239 | return regulator; |
1240 | } | |
5ffbd136 MB |
1241 | |
1242 | /** | |
1243 | * regulator_get - lookup and obtain a reference to a regulator. | |
1244 | * @dev: device for regulator "consumer" | |
1245 | * @id: Supply name or regulator ID. | |
1246 | * | |
1247 | * Returns a struct regulator corresponding to the regulator producer, | |
1248 | * or IS_ERR() condition containing errno. | |
1249 | * | |
1250 | * Use of supply names configured via regulator_set_device_supply() is | |
1251 | * strongly encouraged. It is recommended that the supply name used | |
1252 | * should match the name used for the supply and/or the relevant | |
1253 | * device pins in the datasheet. | |
1254 | */ | |
1255 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1256 | { | |
1257 | return _regulator_get(dev, id, 0); | |
1258 | } | |
414c70cb LG |
1259 | EXPORT_SYMBOL_GPL(regulator_get); |
1260 | ||
5ffbd136 MB |
1261 | /** |
1262 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1263 | * @dev: device for regulator "consumer" | |
1264 | * @id: Supply name or regulator ID. | |
1265 | * | |
1266 | * Returns a struct regulator corresponding to the regulator producer, | |
1267 | * or IS_ERR() condition containing errno. Other consumers will be | |
1268 | * unable to obtain this reference is held and the use count for the | |
1269 | * regulator will be initialised to reflect the current state of the | |
1270 | * regulator. | |
1271 | * | |
1272 | * This is intended for use by consumers which cannot tolerate shared | |
1273 | * use of the regulator such as those which need to force the | |
1274 | * regulator off for correct operation of the hardware they are | |
1275 | * controlling. | |
1276 | * | |
1277 | * Use of supply names configured via regulator_set_device_supply() is | |
1278 | * strongly encouraged. It is recommended that the supply name used | |
1279 | * should match the name used for the supply and/or the relevant | |
1280 | * device pins in the datasheet. | |
1281 | */ | |
1282 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1283 | { | |
1284 | return _regulator_get(dev, id, 1); | |
1285 | } | |
1286 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1287 | ||
414c70cb LG |
1288 | /** |
1289 | * regulator_put - "free" the regulator source | |
1290 | * @regulator: regulator source | |
1291 | * | |
1292 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1293 | * regulator source are balanced by regulator_disable calls prior to calling | |
1294 | * this function. | |
1295 | */ | |
1296 | void regulator_put(struct regulator *regulator) | |
1297 | { | |
1298 | struct regulator_dev *rdev; | |
1299 | ||
1300 | if (regulator == NULL || IS_ERR(regulator)) | |
1301 | return; | |
1302 | ||
414c70cb LG |
1303 | mutex_lock(®ulator_list_mutex); |
1304 | rdev = regulator->rdev; | |
1305 | ||
5de70519 MB |
1306 | #ifdef CONFIG_DEBUG_FS |
1307 | debugfs_remove_recursive(regulator->debugfs); | |
1308 | #endif | |
1309 | ||
414c70cb LG |
1310 | /* remove any sysfs entries */ |
1311 | if (regulator->dev) { | |
1312 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
414c70cb LG |
1313 | device_remove_file(regulator->dev, ®ulator->dev_attr); |
1314 | kfree(regulator->dev_attr.attr.name); | |
1315 | } | |
5de70519 | 1316 | kfree(regulator->supply_name); |
414c70cb LG |
1317 | list_del(®ulator->list); |
1318 | kfree(regulator); | |
1319 | ||
5ffbd136 MB |
1320 | rdev->open_count--; |
1321 | rdev->exclusive = 0; | |
1322 | ||
414c70cb LG |
1323 | module_put(rdev->owner); |
1324 | mutex_unlock(®ulator_list_mutex); | |
1325 | } | |
1326 | EXPORT_SYMBOL_GPL(regulator_put); | |
1327 | ||
9a2372fa MB |
1328 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1329 | { | |
1330 | if (!rdev->constraints) | |
1331 | return 0; | |
1332 | ||
1333 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1334 | return 1; | |
1335 | else | |
1336 | return 0; | |
1337 | } | |
1338 | ||
414c70cb LG |
1339 | /* locks held by regulator_enable() */ |
1340 | static int _regulator_enable(struct regulator_dev *rdev) | |
1341 | { | |
31aae2be | 1342 | int ret, delay; |
414c70cb | 1343 | |
414c70cb | 1344 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1345 | if (rdev->constraints && |
1346 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1347 | drms_uA_update(rdev); | |
414c70cb | 1348 | |
9a2372fa MB |
1349 | if (rdev->use_count == 0) { |
1350 | /* The regulator may on if it's not switchable or left on */ | |
1351 | ret = _regulator_is_enabled(rdev); | |
1352 | if (ret == -EINVAL || ret == 0) { | |
1353 | if (!_regulator_can_change_status(rdev)) | |
1354 | return -EPERM; | |
1355 | ||
31aae2be | 1356 | if (!rdev->desc->ops->enable) |
9a2372fa | 1357 | return -EINVAL; |
31aae2be MB |
1358 | |
1359 | /* Query before enabling in case configuration | |
25985edc | 1360 | * dependent. */ |
31aae2be MB |
1361 | ret = _regulator_get_enable_time(rdev); |
1362 | if (ret >= 0) { | |
1363 | delay = ret; | |
1364 | } else { | |
5da84fd9 | 1365 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1366 | ret); |
31aae2be | 1367 | delay = 0; |
9a2372fa | 1368 | } |
31aae2be | 1369 | |
02fa3ec0 MB |
1370 | trace_regulator_enable(rdev_get_name(rdev)); |
1371 | ||
31aae2be MB |
1372 | /* Allow the regulator to ramp; it would be useful |
1373 | * to extend this for bulk operations so that the | |
1374 | * regulators can ramp together. */ | |
1375 | ret = rdev->desc->ops->enable(rdev); | |
1376 | if (ret < 0) | |
1377 | return ret; | |
1378 | ||
02fa3ec0 MB |
1379 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1380 | ||
e36c1df8 | 1381 | if (delay >= 1000) { |
31aae2be | 1382 | mdelay(delay / 1000); |
e36c1df8 AL |
1383 | udelay(delay % 1000); |
1384 | } else if (delay) { | |
31aae2be | 1385 | udelay(delay); |
e36c1df8 | 1386 | } |
31aae2be | 1387 | |
02fa3ec0 MB |
1388 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1389 | ||
a7433cff | 1390 | } else if (ret < 0) { |
5da84fd9 | 1391 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1392 | return ret; |
1393 | } | |
a7433cff | 1394 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1395 | } |
1396 | ||
9a2372fa MB |
1397 | rdev->use_count++; |
1398 | ||
1399 | return 0; | |
414c70cb LG |
1400 | } |
1401 | ||
1402 | /** | |
1403 | * regulator_enable - enable regulator output | |
1404 | * @regulator: regulator source | |
1405 | * | |
cf7bbcdf MB |
1406 | * Request that the regulator be enabled with the regulator output at |
1407 | * the predefined voltage or current value. Calls to regulator_enable() | |
1408 | * must be balanced with calls to regulator_disable(). | |
1409 | * | |
414c70cb | 1410 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1411 | * hardwired in the regulator. |
414c70cb LG |
1412 | */ |
1413 | int regulator_enable(struct regulator *regulator) | |
1414 | { | |
412aec61 DB |
1415 | struct regulator_dev *rdev = regulator->rdev; |
1416 | int ret = 0; | |
414c70cb | 1417 | |
3801b86a MB |
1418 | if (rdev->supply) { |
1419 | ret = regulator_enable(rdev->supply); | |
1420 | if (ret != 0) | |
1421 | return ret; | |
1422 | } | |
1423 | ||
412aec61 | 1424 | mutex_lock(&rdev->mutex); |
cd94b505 | 1425 | ret = _regulator_enable(rdev); |
412aec61 | 1426 | mutex_unlock(&rdev->mutex); |
3801b86a MB |
1427 | |
1428 | if (ret != 0) | |
1429 | regulator_disable(rdev->supply); | |
1430 | ||
414c70cb LG |
1431 | return ret; |
1432 | } | |
1433 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1434 | ||
1435 | /* locks held by regulator_disable() */ | |
3801b86a | 1436 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1437 | { |
1438 | int ret = 0; | |
1439 | ||
cd94b505 | 1440 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1441 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1442 | return -EIO; |
1443 | ||
414c70cb | 1444 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1445 | if (rdev->use_count == 1 && |
1446 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1447 | |
1448 | /* we are last user */ | |
9a2372fa MB |
1449 | if (_regulator_can_change_status(rdev) && |
1450 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1451 | trace_regulator_disable(rdev_get_name(rdev)); |
1452 | ||
414c70cb LG |
1453 | ret = rdev->desc->ops->disable(rdev); |
1454 | if (ret < 0) { | |
5da84fd9 | 1455 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1456 | return ret; |
1457 | } | |
84b68263 | 1458 | |
02fa3ec0 MB |
1459 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1460 | ||
84b68263 MB |
1461 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1462 | NULL); | |
414c70cb LG |
1463 | } |
1464 | ||
414c70cb LG |
1465 | rdev->use_count = 0; |
1466 | } else if (rdev->use_count > 1) { | |
1467 | ||
1468 | if (rdev->constraints && | |
1469 | (rdev->constraints->valid_ops_mask & | |
1470 | REGULATOR_CHANGE_DRMS)) | |
1471 | drms_uA_update(rdev); | |
1472 | ||
1473 | rdev->use_count--; | |
1474 | } | |
3801b86a | 1475 | |
414c70cb LG |
1476 | return ret; |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * regulator_disable - disable regulator output | |
1481 | * @regulator: regulator source | |
1482 | * | |
cf7bbcdf MB |
1483 | * Disable the regulator output voltage or current. Calls to |
1484 | * regulator_enable() must be balanced with calls to | |
1485 | * regulator_disable(). | |
69279fb9 | 1486 | * |
414c70cb | 1487 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1488 | * devices have it enabled, the regulator device supports disabling and |
1489 | * machine constraints permit this operation. | |
414c70cb LG |
1490 | */ |
1491 | int regulator_disable(struct regulator *regulator) | |
1492 | { | |
412aec61 DB |
1493 | struct regulator_dev *rdev = regulator->rdev; |
1494 | int ret = 0; | |
414c70cb | 1495 | |
412aec61 | 1496 | mutex_lock(&rdev->mutex); |
3801b86a | 1497 | ret = _regulator_disable(rdev); |
412aec61 | 1498 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1499 | |
3801b86a MB |
1500 | if (ret == 0 && rdev->supply) |
1501 | regulator_disable(rdev->supply); | |
8cbf811d | 1502 | |
414c70cb LG |
1503 | return ret; |
1504 | } | |
1505 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1506 | ||
1507 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1508 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1509 | { |
1510 | int ret = 0; | |
1511 | ||
1512 | /* force disable */ | |
1513 | if (rdev->desc->ops->disable) { | |
1514 | /* ah well, who wants to live forever... */ | |
1515 | ret = rdev->desc->ops->disable(rdev); | |
1516 | if (ret < 0) { | |
5da84fd9 | 1517 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1518 | return ret; |
1519 | } | |
1520 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1521 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1522 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1523 | } |
1524 | ||
414c70cb LG |
1525 | return ret; |
1526 | } | |
1527 | ||
1528 | /** | |
1529 | * regulator_force_disable - force disable regulator output | |
1530 | * @regulator: regulator source | |
1531 | * | |
1532 | * Forcibly disable the regulator output voltage or current. | |
1533 | * NOTE: this *will* disable the regulator output even if other consumer | |
1534 | * devices have it enabled. This should be used for situations when device | |
1535 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1536 | */ | |
1537 | int regulator_force_disable(struct regulator *regulator) | |
1538 | { | |
82d15839 | 1539 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1540 | int ret; |
1541 | ||
82d15839 | 1542 | mutex_lock(&rdev->mutex); |
414c70cb | 1543 | regulator->uA_load = 0; |
3801b86a | 1544 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1545 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1546 | |
3801b86a MB |
1547 | if (rdev->supply) |
1548 | while (rdev->open_count--) | |
1549 | regulator_disable(rdev->supply); | |
8cbf811d | 1550 | |
414c70cb LG |
1551 | return ret; |
1552 | } | |
1553 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1554 | ||
1555 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1556 | { | |
9a7f6a4c | 1557 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1558 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1559 | return 1; |
414c70cb | 1560 | |
9332546f | 1561 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1562 | } |
1563 | ||
1564 | /** | |
1565 | * regulator_is_enabled - is the regulator output enabled | |
1566 | * @regulator: regulator source | |
1567 | * | |
412aec61 DB |
1568 | * Returns positive if the regulator driver backing the source/client |
1569 | * has requested that the device be enabled, zero if it hasn't, else a | |
1570 | * negative errno code. | |
1571 | * | |
1572 | * Note that the device backing this regulator handle can have multiple | |
1573 | * users, so it might be enabled even if regulator_enable() was never | |
1574 | * called for this particular source. | |
414c70cb LG |
1575 | */ |
1576 | int regulator_is_enabled(struct regulator *regulator) | |
1577 | { | |
9332546f MB |
1578 | int ret; |
1579 | ||
1580 | mutex_lock(®ulator->rdev->mutex); | |
1581 | ret = _regulator_is_enabled(regulator->rdev); | |
1582 | mutex_unlock(®ulator->rdev->mutex); | |
1583 | ||
1584 | return ret; | |
414c70cb LG |
1585 | } |
1586 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1587 | ||
4367cfdc DB |
1588 | /** |
1589 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1590 | * @regulator: regulator source | |
1591 | * | |
1592 | * Returns number of selectors, or negative errno. Selectors are | |
1593 | * numbered starting at zero, and typically correspond to bitfields | |
1594 | * in hardware registers. | |
1595 | */ | |
1596 | int regulator_count_voltages(struct regulator *regulator) | |
1597 | { | |
1598 | struct regulator_dev *rdev = regulator->rdev; | |
1599 | ||
1600 | return rdev->desc->n_voltages ? : -EINVAL; | |
1601 | } | |
1602 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1603 | ||
1604 | /** | |
1605 | * regulator_list_voltage - enumerate supported voltages | |
1606 | * @regulator: regulator source | |
1607 | * @selector: identify voltage to list | |
1608 | * Context: can sleep | |
1609 | * | |
1610 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1611 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1612 | * negative errno. |
1613 | */ | |
1614 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1615 | { | |
1616 | struct regulator_dev *rdev = regulator->rdev; | |
1617 | struct regulator_ops *ops = rdev->desc->ops; | |
1618 | int ret; | |
1619 | ||
1620 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1621 | return -EINVAL; | |
1622 | ||
1623 | mutex_lock(&rdev->mutex); | |
1624 | ret = ops->list_voltage(rdev, selector); | |
1625 | mutex_unlock(&rdev->mutex); | |
1626 | ||
1627 | if (ret > 0) { | |
1628 | if (ret < rdev->constraints->min_uV) | |
1629 | ret = 0; | |
1630 | else if (ret > rdev->constraints->max_uV) | |
1631 | ret = 0; | |
1632 | } | |
1633 | ||
1634 | return ret; | |
1635 | } | |
1636 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1637 | ||
a7a1ad90 MB |
1638 | /** |
1639 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1640 | * | |
1641 | * @regulator: Regulator to check. | |
1642 | * @min_uV: Minimum required voltage in uV. | |
1643 | * @max_uV: Maximum required voltage in uV. | |
1644 | * | |
1645 | * Returns a boolean or a negative error code. | |
1646 | */ | |
1647 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1648 | int min_uV, int max_uV) | |
1649 | { | |
1650 | int i, voltages, ret; | |
1651 | ||
1652 | ret = regulator_count_voltages(regulator); | |
1653 | if (ret < 0) | |
1654 | return ret; | |
1655 | voltages = ret; | |
1656 | ||
1657 | for (i = 0; i < voltages; i++) { | |
1658 | ret = regulator_list_voltage(regulator, i); | |
1659 | ||
1660 | if (ret >= min_uV && ret <= max_uV) | |
1661 | return 1; | |
1662 | } | |
1663 | ||
1664 | return 0; | |
1665 | } | |
1666 | ||
75790251 MB |
1667 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
1668 | int min_uV, int max_uV) | |
1669 | { | |
1670 | int ret; | |
77af1b26 | 1671 | int delay = 0; |
75790251 MB |
1672 | unsigned int selector; |
1673 | ||
1674 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
1675 | ||
bf5892a8 MB |
1676 | min_uV += rdev->constraints->uV_offset; |
1677 | max_uV += rdev->constraints->uV_offset; | |
1678 | ||
75790251 MB |
1679 | if (rdev->desc->ops->set_voltage) { |
1680 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
1681 | &selector); | |
1682 | ||
1683 | if (rdev->desc->ops->list_voltage) | |
1684 | selector = rdev->desc->ops->list_voltage(rdev, | |
1685 | selector); | |
1686 | else | |
1687 | selector = -1; | |
e8eef82b MB |
1688 | } else if (rdev->desc->ops->set_voltage_sel) { |
1689 | int best_val = INT_MAX; | |
1690 | int i; | |
1691 | ||
1692 | selector = 0; | |
1693 | ||
1694 | /* Find the smallest voltage that falls within the specified | |
1695 | * range. | |
1696 | */ | |
1697 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1698 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
1699 | if (ret < 0) | |
1700 | continue; | |
1701 | ||
1702 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
1703 | best_val = ret; | |
1704 | selector = i; | |
1705 | } | |
1706 | } | |
1707 | ||
77af1b26 LW |
1708 | /* |
1709 | * If we can't obtain the old selector there is not enough | |
1710 | * info to call set_voltage_time_sel(). | |
1711 | */ | |
1712 | if (rdev->desc->ops->set_voltage_time_sel && | |
1713 | rdev->desc->ops->get_voltage_sel) { | |
1714 | unsigned int old_selector = 0; | |
1715 | ||
1716 | ret = rdev->desc->ops->get_voltage_sel(rdev); | |
1717 | if (ret < 0) | |
1718 | return ret; | |
1719 | old_selector = ret; | |
1720 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, | |
1721 | old_selector, selector); | |
1722 | } | |
1723 | ||
e8eef82b MB |
1724 | if (best_val != INT_MAX) { |
1725 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
1726 | selector = best_val; | |
1727 | } else { | |
1728 | ret = -EINVAL; | |
1729 | } | |
75790251 MB |
1730 | } else { |
1731 | ret = -EINVAL; | |
1732 | } | |
1733 | ||
77af1b26 LW |
1734 | /* Insert any necessary delays */ |
1735 | if (delay >= 1000) { | |
1736 | mdelay(delay / 1000); | |
1737 | udelay(delay % 1000); | |
1738 | } else if (delay) { | |
1739 | udelay(delay); | |
1740 | } | |
1741 | ||
ded06a52 MB |
1742 | if (ret == 0) |
1743 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
1744 | NULL); | |
1745 | ||
75790251 MB |
1746 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1747 | ||
1748 | return ret; | |
1749 | } | |
1750 | ||
414c70cb LG |
1751 | /** |
1752 | * regulator_set_voltage - set regulator output voltage | |
1753 | * @regulator: regulator source | |
1754 | * @min_uV: Minimum required voltage in uV | |
1755 | * @max_uV: Maximum acceptable voltage in uV | |
1756 | * | |
1757 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1758 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1759 | * | |
1760 | * If the regulator is enabled then the voltage will change to the new value | |
1761 | * immediately otherwise if the regulator is disabled the regulator will | |
1762 | * output at the new voltage when enabled. | |
1763 | * | |
1764 | * NOTE: If the regulator is shared between several devices then the lowest | |
1765 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1766 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1767 | * calling this function otherwise this call will fail. |
1768 | */ | |
1769 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1770 | { | |
1771 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 1772 | int ret = 0; |
414c70cb LG |
1773 | |
1774 | mutex_lock(&rdev->mutex); | |
1775 | ||
95a3c23a MB |
1776 | /* If we're setting the same range as last time the change |
1777 | * should be a noop (some cpufreq implementations use the same | |
1778 | * voltage for multiple frequencies, for example). | |
1779 | */ | |
1780 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
1781 | goto out; | |
1782 | ||
414c70cb | 1783 | /* sanity check */ |
e8eef82b MB |
1784 | if (!rdev->desc->ops->set_voltage && |
1785 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
1786 | ret = -EINVAL; |
1787 | goto out; | |
1788 | } | |
1789 | ||
1790 | /* constraints check */ | |
1791 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1792 | if (ret < 0) | |
1793 | goto out; | |
1794 | regulator->min_uV = min_uV; | |
1795 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1796 | |
05fda3b1 TP |
1797 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1798 | if (ret < 0) | |
1799 | goto out; | |
1800 | ||
75790251 | 1801 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 1802 | |
414c70cb LG |
1803 | out: |
1804 | mutex_unlock(&rdev->mutex); | |
1805 | return ret; | |
1806 | } | |
1807 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1808 | ||
88cd222b LW |
1809 | /** |
1810 | * regulator_set_voltage_time - get raise/fall time | |
1811 | * @regulator: regulator source | |
1812 | * @old_uV: starting voltage in microvolts | |
1813 | * @new_uV: target voltage in microvolts | |
1814 | * | |
1815 | * Provided with the starting and ending voltage, this function attempts to | |
1816 | * calculate the time in microseconds required to rise or fall to this new | |
1817 | * voltage. | |
1818 | */ | |
1819 | int regulator_set_voltage_time(struct regulator *regulator, | |
1820 | int old_uV, int new_uV) | |
1821 | { | |
1822 | struct regulator_dev *rdev = regulator->rdev; | |
1823 | struct regulator_ops *ops = rdev->desc->ops; | |
1824 | int old_sel = -1; | |
1825 | int new_sel = -1; | |
1826 | int voltage; | |
1827 | int i; | |
1828 | ||
1829 | /* Currently requires operations to do this */ | |
1830 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
1831 | || !rdev->desc->n_voltages) | |
1832 | return -EINVAL; | |
1833 | ||
1834 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1835 | /* We only look for exact voltage matches here */ | |
1836 | voltage = regulator_list_voltage(regulator, i); | |
1837 | if (voltage < 0) | |
1838 | return -EINVAL; | |
1839 | if (voltage == 0) | |
1840 | continue; | |
1841 | if (voltage == old_uV) | |
1842 | old_sel = i; | |
1843 | if (voltage == new_uV) | |
1844 | new_sel = i; | |
1845 | } | |
1846 | ||
1847 | if (old_sel < 0 || new_sel < 0) | |
1848 | return -EINVAL; | |
1849 | ||
1850 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
1851 | } | |
1852 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
1853 | ||
606a2562 MB |
1854 | /** |
1855 | * regulator_sync_voltage - re-apply last regulator output voltage | |
1856 | * @regulator: regulator source | |
1857 | * | |
1858 | * Re-apply the last configured voltage. This is intended to be used | |
1859 | * where some external control source the consumer is cooperating with | |
1860 | * has caused the configured voltage to change. | |
1861 | */ | |
1862 | int regulator_sync_voltage(struct regulator *regulator) | |
1863 | { | |
1864 | struct regulator_dev *rdev = regulator->rdev; | |
1865 | int ret, min_uV, max_uV; | |
1866 | ||
1867 | mutex_lock(&rdev->mutex); | |
1868 | ||
1869 | if (!rdev->desc->ops->set_voltage && | |
1870 | !rdev->desc->ops->set_voltage_sel) { | |
1871 | ret = -EINVAL; | |
1872 | goto out; | |
1873 | } | |
1874 | ||
1875 | /* This is only going to work if we've had a voltage configured. */ | |
1876 | if (!regulator->min_uV && !regulator->max_uV) { | |
1877 | ret = -EINVAL; | |
1878 | goto out; | |
1879 | } | |
1880 | ||
1881 | min_uV = regulator->min_uV; | |
1882 | max_uV = regulator->max_uV; | |
1883 | ||
1884 | /* This should be a paranoia check... */ | |
1885 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1886 | if (ret < 0) | |
1887 | goto out; | |
1888 | ||
1889 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
1890 | if (ret < 0) | |
1891 | goto out; | |
1892 | ||
1893 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
1894 | ||
1895 | out: | |
1896 | mutex_unlock(&rdev->mutex); | |
1897 | return ret; | |
1898 | } | |
1899 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
1900 | ||
414c70cb LG |
1901 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
1902 | { | |
bf5892a8 | 1903 | int sel, ret; |
476c2d83 MB |
1904 | |
1905 | if (rdev->desc->ops->get_voltage_sel) { | |
1906 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
1907 | if (sel < 0) | |
1908 | return sel; | |
bf5892a8 | 1909 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 1910 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 1911 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 1912 | } else { |
414c70cb | 1913 | return -EINVAL; |
cb220d16 | 1914 | } |
bf5892a8 | 1915 | |
cb220d16 AL |
1916 | if (ret < 0) |
1917 | return ret; | |
bf5892a8 | 1918 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
1919 | } |
1920 | ||
1921 | /** | |
1922 | * regulator_get_voltage - get regulator output voltage | |
1923 | * @regulator: regulator source | |
1924 | * | |
1925 | * This returns the current regulator voltage in uV. | |
1926 | * | |
1927 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1928 | * function should not be used to determine regulator state. | |
1929 | */ | |
1930 | int regulator_get_voltage(struct regulator *regulator) | |
1931 | { | |
1932 | int ret; | |
1933 | ||
1934 | mutex_lock(®ulator->rdev->mutex); | |
1935 | ||
1936 | ret = _regulator_get_voltage(regulator->rdev); | |
1937 | ||
1938 | mutex_unlock(®ulator->rdev->mutex); | |
1939 | ||
1940 | return ret; | |
1941 | } | |
1942 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1943 | ||
1944 | /** | |
1945 | * regulator_set_current_limit - set regulator output current limit | |
1946 | * @regulator: regulator source | |
1947 | * @min_uA: Minimuum supported current in uA | |
1948 | * @max_uA: Maximum supported current in uA | |
1949 | * | |
1950 | * Sets current sink to the desired output current. This can be set during | |
1951 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1952 | * | |
1953 | * If the regulator is enabled then the current will change to the new value | |
1954 | * immediately otherwise if the regulator is disabled the regulator will | |
1955 | * output at the new current when enabled. | |
1956 | * | |
1957 | * NOTE: Regulator system constraints must be set for this regulator before | |
1958 | * calling this function otherwise this call will fail. | |
1959 | */ | |
1960 | int regulator_set_current_limit(struct regulator *regulator, | |
1961 | int min_uA, int max_uA) | |
1962 | { | |
1963 | struct regulator_dev *rdev = regulator->rdev; | |
1964 | int ret; | |
1965 | ||
1966 | mutex_lock(&rdev->mutex); | |
1967 | ||
1968 | /* sanity check */ | |
1969 | if (!rdev->desc->ops->set_current_limit) { | |
1970 | ret = -EINVAL; | |
1971 | goto out; | |
1972 | } | |
1973 | ||
1974 | /* constraints check */ | |
1975 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1976 | if (ret < 0) | |
1977 | goto out; | |
1978 | ||
1979 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1980 | out: | |
1981 | mutex_unlock(&rdev->mutex); | |
1982 | return ret; | |
1983 | } | |
1984 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1985 | ||
1986 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1987 | { | |
1988 | int ret; | |
1989 | ||
1990 | mutex_lock(&rdev->mutex); | |
1991 | ||
1992 | /* sanity check */ | |
1993 | if (!rdev->desc->ops->get_current_limit) { | |
1994 | ret = -EINVAL; | |
1995 | goto out; | |
1996 | } | |
1997 | ||
1998 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1999 | out: | |
2000 | mutex_unlock(&rdev->mutex); | |
2001 | return ret; | |
2002 | } | |
2003 | ||
2004 | /** | |
2005 | * regulator_get_current_limit - get regulator output current | |
2006 | * @regulator: regulator source | |
2007 | * | |
2008 | * This returns the current supplied by the specified current sink in uA. | |
2009 | * | |
2010 | * NOTE: If the regulator is disabled it will return the current value. This | |
2011 | * function should not be used to determine regulator state. | |
2012 | */ | |
2013 | int regulator_get_current_limit(struct regulator *regulator) | |
2014 | { | |
2015 | return _regulator_get_current_limit(regulator->rdev); | |
2016 | } | |
2017 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2018 | ||
2019 | /** | |
2020 | * regulator_set_mode - set regulator operating mode | |
2021 | * @regulator: regulator source | |
2022 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2023 | * | |
2024 | * Set regulator operating mode to increase regulator efficiency or improve | |
2025 | * regulation performance. | |
2026 | * | |
2027 | * NOTE: Regulator system constraints must be set for this regulator before | |
2028 | * calling this function otherwise this call will fail. | |
2029 | */ | |
2030 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2031 | { | |
2032 | struct regulator_dev *rdev = regulator->rdev; | |
2033 | int ret; | |
500b4ac9 | 2034 | int regulator_curr_mode; |
414c70cb LG |
2035 | |
2036 | mutex_lock(&rdev->mutex); | |
2037 | ||
2038 | /* sanity check */ | |
2039 | if (!rdev->desc->ops->set_mode) { | |
2040 | ret = -EINVAL; | |
2041 | goto out; | |
2042 | } | |
2043 | ||
500b4ac9 SI |
2044 | /* return if the same mode is requested */ |
2045 | if (rdev->desc->ops->get_mode) { | |
2046 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2047 | if (regulator_curr_mode == mode) { | |
2048 | ret = 0; | |
2049 | goto out; | |
2050 | } | |
2051 | } | |
2052 | ||
414c70cb | 2053 | /* constraints check */ |
22c51b47 | 2054 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2055 | if (ret < 0) |
2056 | goto out; | |
2057 | ||
2058 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2059 | out: | |
2060 | mutex_unlock(&rdev->mutex); | |
2061 | return ret; | |
2062 | } | |
2063 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2064 | ||
2065 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2066 | { | |
2067 | int ret; | |
2068 | ||
2069 | mutex_lock(&rdev->mutex); | |
2070 | ||
2071 | /* sanity check */ | |
2072 | if (!rdev->desc->ops->get_mode) { | |
2073 | ret = -EINVAL; | |
2074 | goto out; | |
2075 | } | |
2076 | ||
2077 | ret = rdev->desc->ops->get_mode(rdev); | |
2078 | out: | |
2079 | mutex_unlock(&rdev->mutex); | |
2080 | return ret; | |
2081 | } | |
2082 | ||
2083 | /** | |
2084 | * regulator_get_mode - get regulator operating mode | |
2085 | * @regulator: regulator source | |
2086 | * | |
2087 | * Get the current regulator operating mode. | |
2088 | */ | |
2089 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2090 | { | |
2091 | return _regulator_get_mode(regulator->rdev); | |
2092 | } | |
2093 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2094 | ||
2095 | /** | |
2096 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2097 | * @regulator: regulator source | |
2098 | * @uA_load: load current | |
2099 | * | |
2100 | * Notifies the regulator core of a new device load. This is then used by | |
2101 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2102 | * operating mode for the new regulator loading. | |
2103 | * | |
2104 | * Consumer devices notify their supply regulator of the maximum power | |
2105 | * they will require (can be taken from device datasheet in the power | |
2106 | * consumption tables) when they change operational status and hence power | |
2107 | * state. Examples of operational state changes that can affect power | |
2108 | * consumption are :- | |
2109 | * | |
2110 | * o Device is opened / closed. | |
2111 | * o Device I/O is about to begin or has just finished. | |
2112 | * o Device is idling in between work. | |
2113 | * | |
2114 | * This information is also exported via sysfs to userspace. | |
2115 | * | |
2116 | * DRMS will sum the total requested load on the regulator and change | |
2117 | * to the most efficient operating mode if platform constraints allow. | |
2118 | * | |
2119 | * Returns the new regulator mode or error. | |
2120 | */ | |
2121 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2122 | { | |
2123 | struct regulator_dev *rdev = regulator->rdev; | |
2124 | struct regulator *consumer; | |
2125 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2126 | unsigned int mode; | |
2127 | ||
2128 | mutex_lock(&rdev->mutex); | |
2129 | ||
a4b41483 MB |
2130 | /* |
2131 | * first check to see if we can set modes at all, otherwise just | |
2132 | * tell the consumer everything is OK. | |
2133 | */ | |
414c70cb LG |
2134 | regulator->uA_load = uA_load; |
2135 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2136 | if (ret < 0) { |
2137 | ret = 0; | |
414c70cb | 2138 | goto out; |
a4b41483 | 2139 | } |
414c70cb | 2140 | |
414c70cb LG |
2141 | if (!rdev->desc->ops->get_optimum_mode) |
2142 | goto out; | |
2143 | ||
a4b41483 MB |
2144 | /* |
2145 | * we can actually do this so any errors are indicators of | |
2146 | * potential real failure. | |
2147 | */ | |
2148 | ret = -EINVAL; | |
2149 | ||
414c70cb | 2150 | /* get output voltage */ |
1bf5a1f8 | 2151 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2152 | if (output_uV <= 0) { |
5da84fd9 | 2153 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2154 | goto out; |
2155 | } | |
2156 | ||
2157 | /* get input voltage */ | |
1bf5a1f8 MB |
2158 | input_uV = 0; |
2159 | if (rdev->supply) | |
3801b86a | 2160 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 2161 | if (input_uV <= 0) |
414c70cb LG |
2162 | input_uV = rdev->constraints->input_uV; |
2163 | if (input_uV <= 0) { | |
5da84fd9 | 2164 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2165 | goto out; |
2166 | } | |
2167 | ||
2168 | /* calc total requested load for this regulator */ | |
2169 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2170 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2171 | |
2172 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2173 | input_uV, output_uV, | |
2174 | total_uA_load); | |
2c608234 | 2175 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2176 | if (ret < 0) { |
5da84fd9 JP |
2177 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2178 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2179 | goto out; |
2180 | } | |
2181 | ||
2182 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2183 | if (ret < 0) { |
5da84fd9 | 2184 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2185 | goto out; |
2186 | } | |
2187 | ret = mode; | |
2188 | out: | |
2189 | mutex_unlock(&rdev->mutex); | |
2190 | return ret; | |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2193 | ||
2194 | /** | |
2195 | * regulator_register_notifier - register regulator event notifier | |
2196 | * @regulator: regulator source | |
69279fb9 | 2197 | * @nb: notifier block |
414c70cb LG |
2198 | * |
2199 | * Register notifier block to receive regulator events. | |
2200 | */ | |
2201 | int regulator_register_notifier(struct regulator *regulator, | |
2202 | struct notifier_block *nb) | |
2203 | { | |
2204 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2205 | nb); | |
2206 | } | |
2207 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2208 | ||
2209 | /** | |
2210 | * regulator_unregister_notifier - unregister regulator event notifier | |
2211 | * @regulator: regulator source | |
69279fb9 | 2212 | * @nb: notifier block |
414c70cb LG |
2213 | * |
2214 | * Unregister regulator event notifier block. | |
2215 | */ | |
2216 | int regulator_unregister_notifier(struct regulator *regulator, | |
2217 | struct notifier_block *nb) | |
2218 | { | |
2219 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2220 | nb); | |
2221 | } | |
2222 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2223 | ||
b136fb44 JC |
2224 | /* notify regulator consumers and downstream regulator consumers. |
2225 | * Note mutex must be held by caller. | |
2226 | */ | |
414c70cb LG |
2227 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2228 | unsigned long event, void *data) | |
2229 | { | |
414c70cb | 2230 | /* call rdev chain first */ |
414c70cb | 2231 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2232 | } |
2233 | ||
2234 | /** | |
2235 | * regulator_bulk_get - get multiple regulator consumers | |
2236 | * | |
2237 | * @dev: Device to supply | |
2238 | * @num_consumers: Number of consumers to register | |
2239 | * @consumers: Configuration of consumers; clients are stored here. | |
2240 | * | |
2241 | * @return 0 on success, an errno on failure. | |
2242 | * | |
2243 | * This helper function allows drivers to get several regulator | |
2244 | * consumers in one operation. If any of the regulators cannot be | |
2245 | * acquired then any regulators that were allocated will be freed | |
2246 | * before returning to the caller. | |
2247 | */ | |
2248 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2249 | struct regulator_bulk_data *consumers) | |
2250 | { | |
2251 | int i; | |
2252 | int ret; | |
2253 | ||
2254 | for (i = 0; i < num_consumers; i++) | |
2255 | consumers[i].consumer = NULL; | |
2256 | ||
2257 | for (i = 0; i < num_consumers; i++) { | |
2258 | consumers[i].consumer = regulator_get(dev, | |
2259 | consumers[i].supply); | |
2260 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2261 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2262 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2263 | consumers[i].supply, ret); | |
414c70cb LG |
2264 | consumers[i].consumer = NULL; |
2265 | goto err; | |
2266 | } | |
2267 | } | |
2268 | ||
2269 | return 0; | |
2270 | ||
2271 | err: | |
2272 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2273 | regulator_put(consumers[i].consumer); | |
2274 | ||
2275 | return ret; | |
2276 | } | |
2277 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2278 | ||
f21e0e81 MB |
2279 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2280 | { | |
2281 | struct regulator_bulk_data *bulk = data; | |
2282 | ||
2283 | bulk->ret = regulator_enable(bulk->consumer); | |
2284 | } | |
2285 | ||
414c70cb LG |
2286 | /** |
2287 | * regulator_bulk_enable - enable multiple regulator consumers | |
2288 | * | |
2289 | * @num_consumers: Number of consumers | |
2290 | * @consumers: Consumer data; clients are stored here. | |
2291 | * @return 0 on success, an errno on failure | |
2292 | * | |
2293 | * This convenience API allows consumers to enable multiple regulator | |
2294 | * clients in a single API call. If any consumers cannot be enabled | |
2295 | * then any others that were enabled will be disabled again prior to | |
2296 | * return. | |
2297 | */ | |
2298 | int regulator_bulk_enable(int num_consumers, | |
2299 | struct regulator_bulk_data *consumers) | |
2300 | { | |
f21e0e81 | 2301 | LIST_HEAD(async_domain); |
414c70cb | 2302 | int i; |
f21e0e81 | 2303 | int ret = 0; |
414c70cb | 2304 | |
f21e0e81 MB |
2305 | for (i = 0; i < num_consumers; i++) |
2306 | async_schedule_domain(regulator_bulk_enable_async, | |
2307 | &consumers[i], &async_domain); | |
2308 | ||
2309 | async_synchronize_full_domain(&async_domain); | |
2310 | ||
2311 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2312 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2313 | if (consumers[i].ret != 0) { |
2314 | ret = consumers[i].ret; | |
414c70cb | 2315 | goto err; |
f21e0e81 | 2316 | } |
414c70cb LG |
2317 | } |
2318 | ||
2319 | return 0; | |
2320 | ||
2321 | err: | |
f21e0e81 MB |
2322 | for (i = 0; i < num_consumers; i++) |
2323 | if (consumers[i].ret == 0) | |
2324 | regulator_disable(consumers[i].consumer); | |
2325 | else | |
2326 | pr_err("Failed to enable %s: %d\n", | |
2327 | consumers[i].supply, consumers[i].ret); | |
414c70cb LG |
2328 | |
2329 | return ret; | |
2330 | } | |
2331 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2332 | ||
2333 | /** | |
2334 | * regulator_bulk_disable - disable multiple regulator consumers | |
2335 | * | |
2336 | * @num_consumers: Number of consumers | |
2337 | * @consumers: Consumer data; clients are stored here. | |
2338 | * @return 0 on success, an errno on failure | |
2339 | * | |
2340 | * This convenience API allows consumers to disable multiple regulator | |
2341 | * clients in a single API call. If any consumers cannot be enabled | |
2342 | * then any others that were disabled will be disabled again prior to | |
2343 | * return. | |
2344 | */ | |
2345 | int regulator_bulk_disable(int num_consumers, | |
2346 | struct regulator_bulk_data *consumers) | |
2347 | { | |
2348 | int i; | |
2349 | int ret; | |
2350 | ||
2351 | for (i = 0; i < num_consumers; i++) { | |
2352 | ret = regulator_disable(consumers[i].consumer); | |
2353 | if (ret != 0) | |
2354 | goto err; | |
2355 | } | |
2356 | ||
2357 | return 0; | |
2358 | ||
2359 | err: | |
5da84fd9 | 2360 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2361 | for (--i; i >= 0; --i) |
414c70cb LG |
2362 | regulator_enable(consumers[i].consumer); |
2363 | ||
2364 | return ret; | |
2365 | } | |
2366 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2367 | ||
2368 | /** | |
2369 | * regulator_bulk_free - free multiple regulator consumers | |
2370 | * | |
2371 | * @num_consumers: Number of consumers | |
2372 | * @consumers: Consumer data; clients are stored here. | |
2373 | * | |
2374 | * This convenience API allows consumers to free multiple regulator | |
2375 | * clients in a single API call. | |
2376 | */ | |
2377 | void regulator_bulk_free(int num_consumers, | |
2378 | struct regulator_bulk_data *consumers) | |
2379 | { | |
2380 | int i; | |
2381 | ||
2382 | for (i = 0; i < num_consumers; i++) { | |
2383 | regulator_put(consumers[i].consumer); | |
2384 | consumers[i].consumer = NULL; | |
2385 | } | |
2386 | } | |
2387 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2388 | ||
2389 | /** | |
2390 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2391 | * @rdev: regulator source |
414c70cb | 2392 | * @event: notifier block |
69279fb9 | 2393 | * @data: callback-specific data. |
414c70cb LG |
2394 | * |
2395 | * Called by regulator drivers to notify clients a regulator event has | |
2396 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2397 | * Note lock must be held by caller. |
414c70cb LG |
2398 | */ |
2399 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2400 | unsigned long event, void *data) | |
2401 | { | |
2402 | _notifier_call_chain(rdev, event, data); | |
2403 | return NOTIFY_DONE; | |
2404 | ||
2405 | } | |
2406 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2407 | ||
be721979 MB |
2408 | /** |
2409 | * regulator_mode_to_status - convert a regulator mode into a status | |
2410 | * | |
2411 | * @mode: Mode to convert | |
2412 | * | |
2413 | * Convert a regulator mode into a status. | |
2414 | */ | |
2415 | int regulator_mode_to_status(unsigned int mode) | |
2416 | { | |
2417 | switch (mode) { | |
2418 | case REGULATOR_MODE_FAST: | |
2419 | return REGULATOR_STATUS_FAST; | |
2420 | case REGULATOR_MODE_NORMAL: | |
2421 | return REGULATOR_STATUS_NORMAL; | |
2422 | case REGULATOR_MODE_IDLE: | |
2423 | return REGULATOR_STATUS_IDLE; | |
2424 | case REGULATOR_STATUS_STANDBY: | |
2425 | return REGULATOR_STATUS_STANDBY; | |
2426 | default: | |
2427 | return 0; | |
2428 | } | |
2429 | } | |
2430 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2431 | ||
7ad68e2f DB |
2432 | /* |
2433 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2434 | * create attributes that can be meaningfully displayed. | |
2435 | */ | |
2436 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2437 | { | |
2438 | struct device *dev = &rdev->dev; | |
2439 | struct regulator_ops *ops = rdev->desc->ops; | |
2440 | int status = 0; | |
2441 | ||
2442 | /* some attributes need specific methods to be displayed */ | |
476c2d83 | 2443 | if (ops->get_voltage || ops->get_voltage_sel) { |
7ad68e2f DB |
2444 | status = device_create_file(dev, &dev_attr_microvolts); |
2445 | if (status < 0) | |
2446 | return status; | |
2447 | } | |
2448 | if (ops->get_current_limit) { | |
2449 | status = device_create_file(dev, &dev_attr_microamps); | |
2450 | if (status < 0) | |
2451 | return status; | |
2452 | } | |
2453 | if (ops->get_mode) { | |
2454 | status = device_create_file(dev, &dev_attr_opmode); | |
2455 | if (status < 0) | |
2456 | return status; | |
2457 | } | |
2458 | if (ops->is_enabled) { | |
2459 | status = device_create_file(dev, &dev_attr_state); | |
2460 | if (status < 0) | |
2461 | return status; | |
2462 | } | |
853116a1 DB |
2463 | if (ops->get_status) { |
2464 | status = device_create_file(dev, &dev_attr_status); | |
2465 | if (status < 0) | |
2466 | return status; | |
2467 | } | |
7ad68e2f DB |
2468 | |
2469 | /* some attributes are type-specific */ | |
2470 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2471 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2472 | if (status < 0) | |
2473 | return status; | |
2474 | } | |
2475 | ||
2476 | /* all the other attributes exist to support constraints; | |
2477 | * don't show them if there are no constraints, or if the | |
2478 | * relevant supporting methods are missing. | |
2479 | */ | |
2480 | if (!rdev->constraints) | |
2481 | return status; | |
2482 | ||
2483 | /* constraints need specific supporting methods */ | |
e8eef82b | 2484 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2485 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2486 | if (status < 0) | |
2487 | return status; | |
2488 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2489 | if (status < 0) | |
2490 | return status; | |
2491 | } | |
2492 | if (ops->set_current_limit) { | |
2493 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2494 | if (status < 0) | |
2495 | return status; | |
2496 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2497 | if (status < 0) | |
2498 | return status; | |
2499 | } | |
2500 | ||
2501 | /* suspend mode constraints need multiple supporting methods */ | |
2502 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2503 | return status; | |
2504 | ||
2505 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2506 | if (status < 0) | |
2507 | return status; | |
2508 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2509 | if (status < 0) | |
2510 | return status; | |
2511 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2512 | if (status < 0) | |
2513 | return status; | |
2514 | ||
2515 | if (ops->set_suspend_voltage) { | |
2516 | status = device_create_file(dev, | |
2517 | &dev_attr_suspend_standby_microvolts); | |
2518 | if (status < 0) | |
2519 | return status; | |
2520 | status = device_create_file(dev, | |
2521 | &dev_attr_suspend_mem_microvolts); | |
2522 | if (status < 0) | |
2523 | return status; | |
2524 | status = device_create_file(dev, | |
2525 | &dev_attr_suspend_disk_microvolts); | |
2526 | if (status < 0) | |
2527 | return status; | |
2528 | } | |
2529 | ||
2530 | if (ops->set_suspend_mode) { | |
2531 | status = device_create_file(dev, | |
2532 | &dev_attr_suspend_standby_mode); | |
2533 | if (status < 0) | |
2534 | return status; | |
2535 | status = device_create_file(dev, | |
2536 | &dev_attr_suspend_mem_mode); | |
2537 | if (status < 0) | |
2538 | return status; | |
2539 | status = device_create_file(dev, | |
2540 | &dev_attr_suspend_disk_mode); | |
2541 | if (status < 0) | |
2542 | return status; | |
2543 | } | |
2544 | ||
2545 | return status; | |
2546 | } | |
2547 | ||
1130e5b3 MB |
2548 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
2549 | { | |
2550 | #ifdef CONFIG_DEBUG_FS | |
2551 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); | |
2552 | if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { | |
2553 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
2554 | rdev->debugfs = NULL; | |
2555 | return; | |
2556 | } | |
2557 | ||
2558 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
2559 | &rdev->use_count); | |
2560 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
2561 | &rdev->open_count); | |
2562 | #endif | |
2563 | } | |
2564 | ||
414c70cb LG |
2565 | /** |
2566 | * regulator_register - register regulator | |
69279fb9 MB |
2567 | * @regulator_desc: regulator to register |
2568 | * @dev: struct device for the regulator | |
0527100f | 2569 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2570 | * @driver_data: private regulator data |
414c70cb LG |
2571 | * |
2572 | * Called by regulator drivers to register a regulator. | |
2573 | * Returns 0 on success. | |
2574 | */ | |
2575 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2576 | struct device *dev, const struct regulator_init_data *init_data, |
0527100f | 2577 | void *driver_data) |
414c70cb LG |
2578 | { |
2579 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2580 | struct regulator_dev *rdev; | |
a5766f11 | 2581 | int ret, i; |
414c70cb LG |
2582 | |
2583 | if (regulator_desc == NULL) | |
2584 | return ERR_PTR(-EINVAL); | |
2585 | ||
2586 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2587 | return ERR_PTR(-EINVAL); | |
2588 | ||
cd78dfc6 DL |
2589 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2590 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2591 | return ERR_PTR(-EINVAL); |
2592 | ||
46fabe1e MB |
2593 | if (!init_data) |
2594 | return ERR_PTR(-EINVAL); | |
2595 | ||
476c2d83 MB |
2596 | /* Only one of each should be implemented */ |
2597 | WARN_ON(regulator_desc->ops->get_voltage && | |
2598 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
2599 | WARN_ON(regulator_desc->ops->set_voltage && |
2600 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
2601 | |
2602 | /* If we're using selectors we must implement list_voltage. */ | |
2603 | if (regulator_desc->ops->get_voltage_sel && | |
2604 | !regulator_desc->ops->list_voltage) { | |
2605 | return ERR_PTR(-EINVAL); | |
2606 | } | |
e8eef82b MB |
2607 | if (regulator_desc->ops->set_voltage_sel && |
2608 | !regulator_desc->ops->list_voltage) { | |
2609 | return ERR_PTR(-EINVAL); | |
2610 | } | |
476c2d83 | 2611 | |
414c70cb LG |
2612 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2613 | if (rdev == NULL) | |
2614 | return ERR_PTR(-ENOMEM); | |
2615 | ||
2616 | mutex_lock(®ulator_list_mutex); | |
2617 | ||
2618 | mutex_init(&rdev->mutex); | |
a5766f11 | 2619 | rdev->reg_data = driver_data; |
414c70cb LG |
2620 | rdev->owner = regulator_desc->owner; |
2621 | rdev->desc = regulator_desc; | |
2622 | INIT_LIST_HEAD(&rdev->consumer_list); | |
414c70cb | 2623 | INIT_LIST_HEAD(&rdev->list); |
414c70cb LG |
2624 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
2625 | ||
a5766f11 LG |
2626 | /* preform any regulator specific init */ |
2627 | if (init_data->regulator_init) { | |
2628 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2629 | if (ret < 0) |
2630 | goto clean; | |
a5766f11 LG |
2631 | } |
2632 | ||
a5766f11 | 2633 | /* register with sysfs */ |
414c70cb | 2634 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2635 | rdev->dev.parent = dev; |
812460a9 KS |
2636 | dev_set_name(&rdev->dev, "regulator.%d", |
2637 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2638 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2639 | if (ret != 0) { |
2640 | put_device(&rdev->dev); | |
4fca9545 | 2641 | goto clean; |
ad7725cb | 2642 | } |
a5766f11 LG |
2643 | |
2644 | dev_set_drvdata(&rdev->dev, rdev); | |
2645 | ||
74f544c1 MR |
2646 | /* set regulator constraints */ |
2647 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2648 | if (ret < 0) | |
2649 | goto scrub; | |
2650 | ||
7ad68e2f DB |
2651 | /* add attributes supported by this regulator */ |
2652 | ret = add_regulator_attributes(rdev); | |
2653 | if (ret < 0) | |
2654 | goto scrub; | |
2655 | ||
0178f3e2 MB |
2656 | if (init_data->supply_regulator) { |
2657 | struct regulator_dev *r; | |
2658 | int found = 0; | |
2659 | ||
2660 | list_for_each_entry(r, ®ulator_list, list) { | |
2661 | if (strcmp(rdev_get_name(r), | |
2662 | init_data->supply_regulator) == 0) { | |
2663 | found = 1; | |
2664 | break; | |
2665 | } | |
2666 | } | |
2667 | ||
2668 | if (!found) { | |
2669 | dev_err(dev, "Failed to find supply %s\n", | |
2670 | init_data->supply_regulator); | |
7727da22 | 2671 | ret = -ENODEV; |
0178f3e2 MB |
2672 | goto scrub; |
2673 | } | |
2674 | ||
2675 | ret = set_supply(rdev, r); | |
2676 | if (ret < 0) | |
2677 | goto scrub; | |
2678 | } | |
2679 | ||
a5766f11 LG |
2680 | /* add consumers devices */ |
2681 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2682 | ret = set_consumer_device_supply(rdev, | |
2683 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2684 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2685 | init_data->consumer_supplies[i].supply); |
23c2f041 MB |
2686 | if (ret < 0) { |
2687 | dev_err(dev, "Failed to set supply %s\n", | |
2688 | init_data->consumer_supplies[i].supply); | |
d4033b54 | 2689 | goto unset_supplies; |
23c2f041 | 2690 | } |
414c70cb | 2691 | } |
a5766f11 LG |
2692 | |
2693 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
2694 | |
2695 | rdev_init_debugfs(rdev); | |
a5766f11 | 2696 | out: |
414c70cb LG |
2697 | mutex_unlock(®ulator_list_mutex); |
2698 | return rdev; | |
4fca9545 | 2699 | |
d4033b54 JN |
2700 | unset_supplies: |
2701 | unset_regulator_supplies(rdev); | |
2702 | ||
4fca9545 | 2703 | scrub: |
1a6958e7 | 2704 | kfree(rdev->constraints); |
4fca9545 | 2705 | device_unregister(&rdev->dev); |
53032daf PW |
2706 | /* device core frees rdev */ |
2707 | rdev = ERR_PTR(ret); | |
2708 | goto out; | |
2709 | ||
4fca9545 DB |
2710 | clean: |
2711 | kfree(rdev); | |
2712 | rdev = ERR_PTR(ret); | |
2713 | goto out; | |
414c70cb LG |
2714 | } |
2715 | EXPORT_SYMBOL_GPL(regulator_register); | |
2716 | ||
2717 | /** | |
2718 | * regulator_unregister - unregister regulator | |
69279fb9 | 2719 | * @rdev: regulator to unregister |
414c70cb LG |
2720 | * |
2721 | * Called by regulator drivers to unregister a regulator. | |
2722 | */ | |
2723 | void regulator_unregister(struct regulator_dev *rdev) | |
2724 | { | |
2725 | if (rdev == NULL) | |
2726 | return; | |
2727 | ||
2728 | mutex_lock(®ulator_list_mutex); | |
1130e5b3 MB |
2729 | #ifdef CONFIG_DEBUG_FS |
2730 | debugfs_remove_recursive(rdev->debugfs); | |
2731 | #endif | |
6bf87d17 | 2732 | WARN_ON(rdev->open_count); |
0f1d747b | 2733 | unset_regulator_supplies(rdev); |
414c70cb LG |
2734 | list_del(&rdev->list); |
2735 | if (rdev->supply) | |
3801b86a | 2736 | regulator_put(rdev->supply); |
414c70cb | 2737 | device_unregister(&rdev->dev); |
f8c12fe3 | 2738 | kfree(rdev->constraints); |
414c70cb LG |
2739 | mutex_unlock(®ulator_list_mutex); |
2740 | } | |
2741 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2742 | ||
414c70cb | 2743 | /** |
cf7bbcdf | 2744 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2745 | * @state: system suspend state |
2746 | * | |
2747 | * Configure each regulator with it's suspend operating parameters for state. | |
2748 | * This will usually be called by machine suspend code prior to supending. | |
2749 | */ | |
2750 | int regulator_suspend_prepare(suspend_state_t state) | |
2751 | { | |
2752 | struct regulator_dev *rdev; | |
2753 | int ret = 0; | |
2754 | ||
2755 | /* ON is handled by regulator active state */ | |
2756 | if (state == PM_SUSPEND_ON) | |
2757 | return -EINVAL; | |
2758 | ||
2759 | mutex_lock(®ulator_list_mutex); | |
2760 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2761 | ||
2762 | mutex_lock(&rdev->mutex); | |
2763 | ret = suspend_prepare(rdev, state); | |
2764 | mutex_unlock(&rdev->mutex); | |
2765 | ||
2766 | if (ret < 0) { | |
5da84fd9 | 2767 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2768 | goto out; |
2769 | } | |
2770 | } | |
2771 | out: | |
2772 | mutex_unlock(®ulator_list_mutex); | |
2773 | return ret; | |
2774 | } | |
2775 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2776 | ||
7a32b589 MH |
2777 | /** |
2778 | * regulator_suspend_finish - resume regulators from system wide suspend | |
2779 | * | |
2780 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
2781 | * and that should be turned on according to the regulators properties. | |
2782 | */ | |
2783 | int regulator_suspend_finish(void) | |
2784 | { | |
2785 | struct regulator_dev *rdev; | |
2786 | int ret = 0, error; | |
2787 | ||
2788 | mutex_lock(®ulator_list_mutex); | |
2789 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2790 | struct regulator_ops *ops = rdev->desc->ops; | |
2791 | ||
2792 | mutex_lock(&rdev->mutex); | |
2793 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
2794 | ops->enable) { | |
2795 | error = ops->enable(rdev); | |
2796 | if (error) | |
2797 | ret = error; | |
2798 | } else { | |
2799 | if (!has_full_constraints) | |
2800 | goto unlock; | |
2801 | if (!ops->disable) | |
2802 | goto unlock; | |
2803 | if (ops->is_enabled && !ops->is_enabled(rdev)) | |
2804 | goto unlock; | |
2805 | ||
2806 | error = ops->disable(rdev); | |
2807 | if (error) | |
2808 | ret = error; | |
2809 | } | |
2810 | unlock: | |
2811 | mutex_unlock(&rdev->mutex); | |
2812 | } | |
2813 | mutex_unlock(®ulator_list_mutex); | |
2814 | return ret; | |
2815 | } | |
2816 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
2817 | ||
ca725561 MB |
2818 | /** |
2819 | * regulator_has_full_constraints - the system has fully specified constraints | |
2820 | * | |
2821 | * Calling this function will cause the regulator API to disable all | |
2822 | * regulators which have a zero use count and don't have an always_on | |
2823 | * constraint in a late_initcall. | |
2824 | * | |
2825 | * The intention is that this will become the default behaviour in a | |
2826 | * future kernel release so users are encouraged to use this facility | |
2827 | * now. | |
2828 | */ | |
2829 | void regulator_has_full_constraints(void) | |
2830 | { | |
2831 | has_full_constraints = 1; | |
2832 | } | |
2833 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2834 | ||
688fe99a MB |
2835 | /** |
2836 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2837 | * | |
2838 | * Calling this function will cause the regulator API to provide a | |
2839 | * dummy regulator to consumers if no physical regulator is found, | |
2840 | * allowing most consumers to proceed as though a regulator were | |
2841 | * configured. This allows systems such as those with software | |
2842 | * controllable regulators for the CPU core only to be brought up more | |
2843 | * readily. | |
2844 | */ | |
2845 | void regulator_use_dummy_regulator(void) | |
2846 | { | |
2847 | board_wants_dummy_regulator = true; | |
2848 | } | |
2849 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2850 | ||
414c70cb LG |
2851 | /** |
2852 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2853 | * @rdev: regulator |
414c70cb LG |
2854 | * |
2855 | * Get rdev regulator driver private data. This call can be used in the | |
2856 | * regulator driver context. | |
2857 | */ | |
2858 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2859 | { | |
2860 | return rdev->reg_data; | |
2861 | } | |
2862 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2863 | ||
2864 | /** | |
2865 | * regulator_get_drvdata - get regulator driver data | |
2866 | * @regulator: regulator | |
2867 | * | |
2868 | * Get regulator driver private data. This call can be used in the consumer | |
2869 | * driver context when non API regulator specific functions need to be called. | |
2870 | */ | |
2871 | void *regulator_get_drvdata(struct regulator *regulator) | |
2872 | { | |
2873 | return regulator->rdev->reg_data; | |
2874 | } | |
2875 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2876 | ||
2877 | /** | |
2878 | * regulator_set_drvdata - set regulator driver data | |
2879 | * @regulator: regulator | |
2880 | * @data: data | |
2881 | */ | |
2882 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2883 | { | |
2884 | regulator->rdev->reg_data = data; | |
2885 | } | |
2886 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2887 | ||
2888 | /** | |
2889 | * regulator_get_id - get regulator ID | |
69279fb9 | 2890 | * @rdev: regulator |
414c70cb LG |
2891 | */ |
2892 | int rdev_get_id(struct regulator_dev *rdev) | |
2893 | { | |
2894 | return rdev->desc->id; | |
2895 | } | |
2896 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2897 | ||
a5766f11 LG |
2898 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2899 | { | |
2900 | return &rdev->dev; | |
2901 | } | |
2902 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2903 | ||
2904 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2905 | { | |
2906 | return reg_init_data->driver_data; | |
2907 | } | |
2908 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2909 | ||
414c70cb LG |
2910 | static int __init regulator_init(void) |
2911 | { | |
34abbd68 MB |
2912 | int ret; |
2913 | ||
34abbd68 MB |
2914 | ret = class_register(®ulator_class); |
2915 | ||
1130e5b3 MB |
2916 | #ifdef CONFIG_DEBUG_FS |
2917 | debugfs_root = debugfs_create_dir("regulator", NULL); | |
2918 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
2919 | pr_warn("regulator: Failed to create debugfs directory\n"); | |
2920 | debugfs_root = NULL; | |
2921 | } | |
2922 | #endif | |
2923 | ||
34abbd68 MB |
2924 | regulator_dummy_init(); |
2925 | ||
2926 | return ret; | |
414c70cb LG |
2927 | } |
2928 | ||
2929 | /* init early to allow our consumers to complete system booting */ | |
2930 | core_initcall(regulator_init); | |
ca725561 MB |
2931 | |
2932 | static int __init regulator_init_complete(void) | |
2933 | { | |
2934 | struct regulator_dev *rdev; | |
2935 | struct regulator_ops *ops; | |
2936 | struct regulation_constraints *c; | |
2937 | int enabled, ret; | |
ca725561 MB |
2938 | |
2939 | mutex_lock(®ulator_list_mutex); | |
2940 | ||
2941 | /* If we have a full configuration then disable any regulators | |
2942 | * which are not in use or always_on. This will become the | |
2943 | * default behaviour in the future. | |
2944 | */ | |
2945 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2946 | ops = rdev->desc->ops; | |
2947 | c = rdev->constraints; | |
2948 | ||
f25e0b4f | 2949 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2950 | continue; |
2951 | ||
2952 | mutex_lock(&rdev->mutex); | |
2953 | ||
2954 | if (rdev->use_count) | |
2955 | goto unlock; | |
2956 | ||
2957 | /* If we can't read the status assume it's on. */ | |
2958 | if (ops->is_enabled) | |
2959 | enabled = ops->is_enabled(rdev); | |
2960 | else | |
2961 | enabled = 1; | |
2962 | ||
2963 | if (!enabled) | |
2964 | goto unlock; | |
2965 | ||
2966 | if (has_full_constraints) { | |
2967 | /* We log since this may kill the system if it | |
2968 | * goes wrong. */ | |
5da84fd9 | 2969 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
2970 | ret = ops->disable(rdev); |
2971 | if (ret != 0) { | |
5da84fd9 | 2972 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
2973 | } |
2974 | } else { | |
2975 | /* The intention is that in future we will | |
2976 | * assume that full constraints are provided | |
2977 | * so warn even if we aren't going to do | |
2978 | * anything here. | |
2979 | */ | |
5da84fd9 | 2980 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
2981 | } |
2982 | ||
2983 | unlock: | |
2984 | mutex_unlock(&rdev->mutex); | |
2985 | } | |
2986 | ||
2987 | mutex_unlock(®ulator_list_mutex); | |
2988 | ||
2989 | return 0; | |
2990 | } | |
2991 | late_initcall(regulator_init_complete); |