Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
1d7372e1 | 16 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
c5e28ed7 | 17 | |
414c70cb LG |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
1130e5b3 | 20 | #include <linux/debugfs.h> |
414c70cb | 21 | #include <linux/device.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
f21e0e81 | 23 | #include <linux/async.h> |
414c70cb LG |
24 | #include <linux/err.h> |
25 | #include <linux/mutex.h> | |
26 | #include <linux/suspend.h> | |
31aae2be | 27 | #include <linux/delay.h> |
414c70cb LG |
28 | #include <linux/regulator/consumer.h> |
29 | #include <linux/regulator/driver.h> | |
30 | #include <linux/regulator/machine.h> | |
65602c32 | 31 | #include <linux/module.h> |
414c70cb | 32 | |
02fa3ec0 MB |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/regulator.h> | |
35 | ||
34abbd68 MB |
36 | #include "dummy.h" |
37 | ||
7d51a0db MB |
38 | #define rdev_crit(rdev, fmt, ...) \ |
39 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
40 | #define rdev_err(rdev, fmt, ...) \ |
41 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
42 | #define rdev_warn(rdev, fmt, ...) \ | |
43 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
44 | #define rdev_info(rdev, fmt, ...) \ | |
45 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_dbg(rdev, fmt, ...) \ | |
47 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | ||
414c70cb LG |
49 | static DEFINE_MUTEX(regulator_list_mutex); |
50 | static LIST_HEAD(regulator_list); | |
51 | static LIST_HEAD(regulator_map_list); | |
21cf891a | 52 | static bool has_full_constraints; |
688fe99a | 53 | static bool board_wants_dummy_regulator; |
414c70cb | 54 | |
1130e5b3 MB |
55 | #ifdef CONFIG_DEBUG_FS |
56 | static struct dentry *debugfs_root; | |
57 | #endif | |
58 | ||
8dc5390d | 59 | /* |
414c70cb LG |
60 | * struct regulator_map |
61 | * | |
62 | * Used to provide symbolic supply names to devices. | |
63 | */ | |
64 | struct regulator_map { | |
65 | struct list_head list; | |
40f9244f | 66 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 67 | const char *supply; |
a5766f11 | 68 | struct regulator_dev *regulator; |
414c70cb LG |
69 | }; |
70 | ||
414c70cb LG |
71 | /* |
72 | * struct regulator | |
73 | * | |
74 | * One for each consumer device. | |
75 | */ | |
76 | struct regulator { | |
77 | struct device *dev; | |
78 | struct list_head list; | |
79 | int uA_load; | |
80 | int min_uV; | |
81 | int max_uV; | |
414c70cb LG |
82 | char *supply_name; |
83 | struct device_attribute dev_attr; | |
84 | struct regulator_dev *rdev; | |
5de70519 MB |
85 | #ifdef CONFIG_DEBUG_FS |
86 | struct dentry *debugfs; | |
87 | #endif | |
414c70cb LG |
88 | }; |
89 | ||
90 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 91 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
92 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
93 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
94 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
95 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
96 | unsigned long event, void *data); | |
75790251 MB |
97 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
98 | int min_uV, int max_uV); | |
3801b86a MB |
99 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
100 | struct device *dev, | |
101 | const char *supply_name); | |
414c70cb | 102 | |
1083c393 MB |
103 | static const char *rdev_get_name(struct regulator_dev *rdev) |
104 | { | |
105 | if (rdev->constraints && rdev->constraints->name) | |
106 | return rdev->constraints->name; | |
107 | else if (rdev->desc->name) | |
108 | return rdev->desc->name; | |
109 | else | |
110 | return ""; | |
111 | } | |
112 | ||
414c70cb LG |
113 | /* gets the regulator for a given consumer device */ |
114 | static struct regulator *get_device_regulator(struct device *dev) | |
115 | { | |
116 | struct regulator *regulator = NULL; | |
117 | struct regulator_dev *rdev; | |
118 | ||
119 | mutex_lock(®ulator_list_mutex); | |
120 | list_for_each_entry(rdev, ®ulator_list, list) { | |
121 | mutex_lock(&rdev->mutex); | |
122 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
123 | if (regulator->dev == dev) { | |
124 | mutex_unlock(&rdev->mutex); | |
125 | mutex_unlock(®ulator_list_mutex); | |
126 | return regulator; | |
127 | } | |
128 | } | |
129 | mutex_unlock(&rdev->mutex); | |
130 | } | |
131 | mutex_unlock(®ulator_list_mutex); | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | /* Platform voltage constraint check */ | |
136 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
137 | int *min_uV, int *max_uV) | |
138 | { | |
139 | BUG_ON(*min_uV > *max_uV); | |
140 | ||
141 | if (!rdev->constraints) { | |
5da84fd9 | 142 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
143 | return -ENODEV; |
144 | } | |
145 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 146 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
147 | return -EPERM; |
148 | } | |
149 | ||
150 | if (*max_uV > rdev->constraints->max_uV) | |
151 | *max_uV = rdev->constraints->max_uV; | |
152 | if (*min_uV < rdev->constraints->min_uV) | |
153 | *min_uV = rdev->constraints->min_uV; | |
154 | ||
89f425ed MB |
155 | if (*min_uV > *max_uV) { |
156 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 157 | *min_uV, *max_uV); |
414c70cb | 158 | return -EINVAL; |
89f425ed | 159 | } |
414c70cb LG |
160 | |
161 | return 0; | |
162 | } | |
163 | ||
05fda3b1 TP |
164 | /* Make sure we select a voltage that suits the needs of all |
165 | * regulator consumers | |
166 | */ | |
167 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
168 | int *min_uV, int *max_uV) | |
169 | { | |
170 | struct regulator *regulator; | |
171 | ||
172 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
173 | /* |
174 | * Assume consumers that didn't say anything are OK | |
175 | * with anything in the constraint range. | |
176 | */ | |
177 | if (!regulator->min_uV && !regulator->max_uV) | |
178 | continue; | |
179 | ||
05fda3b1 TP |
180 | if (*max_uV > regulator->max_uV) |
181 | *max_uV = regulator->max_uV; | |
182 | if (*min_uV < regulator->min_uV) | |
183 | *min_uV = regulator->min_uV; | |
184 | } | |
185 | ||
186 | if (*min_uV > *max_uV) | |
187 | return -EINVAL; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
414c70cb LG |
192 | /* current constraint check */ |
193 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
194 | int *min_uA, int *max_uA) | |
195 | { | |
196 | BUG_ON(*min_uA > *max_uA); | |
197 | ||
198 | if (!rdev->constraints) { | |
5da84fd9 | 199 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
200 | return -ENODEV; |
201 | } | |
202 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 203 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
204 | return -EPERM; |
205 | } | |
206 | ||
207 | if (*max_uA > rdev->constraints->max_uA) | |
208 | *max_uA = rdev->constraints->max_uA; | |
209 | if (*min_uA < rdev->constraints->min_uA) | |
210 | *min_uA = rdev->constraints->min_uA; | |
211 | ||
89f425ed MB |
212 | if (*min_uA > *max_uA) { |
213 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 214 | *min_uA, *max_uA); |
414c70cb | 215 | return -EINVAL; |
89f425ed | 216 | } |
414c70cb LG |
217 | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /* operating mode constraint check */ | |
2c608234 | 222 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 223 | { |
2c608234 | 224 | switch (*mode) { |
e573520b DB |
225 | case REGULATOR_MODE_FAST: |
226 | case REGULATOR_MODE_NORMAL: | |
227 | case REGULATOR_MODE_IDLE: | |
228 | case REGULATOR_MODE_STANDBY: | |
229 | break; | |
230 | default: | |
89f425ed | 231 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
232 | return -EINVAL; |
233 | } | |
234 | ||
414c70cb | 235 | if (!rdev->constraints) { |
5da84fd9 | 236 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
237 | return -ENODEV; |
238 | } | |
239 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 240 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
241 | return -EPERM; |
242 | } | |
2c608234 MB |
243 | |
244 | /* The modes are bitmasks, the most power hungry modes having | |
245 | * the lowest values. If the requested mode isn't supported | |
246 | * try higher modes. */ | |
247 | while (*mode) { | |
248 | if (rdev->constraints->valid_modes_mask & *mode) | |
249 | return 0; | |
250 | *mode /= 2; | |
414c70cb | 251 | } |
2c608234 MB |
252 | |
253 | return -EINVAL; | |
414c70cb LG |
254 | } |
255 | ||
256 | /* dynamic regulator mode switching constraint check */ | |
257 | static int regulator_check_drms(struct regulator_dev *rdev) | |
258 | { | |
259 | if (!rdev->constraints) { | |
5da84fd9 | 260 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
261 | return -ENODEV; |
262 | } | |
263 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 264 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
265 | return -EPERM; |
266 | } | |
267 | return 0; | |
268 | } | |
269 | ||
270 | static ssize_t device_requested_uA_show(struct device *dev, | |
271 | struct device_attribute *attr, char *buf) | |
272 | { | |
273 | struct regulator *regulator; | |
274 | ||
275 | regulator = get_device_regulator(dev); | |
276 | if (regulator == NULL) | |
277 | return 0; | |
278 | ||
279 | return sprintf(buf, "%d\n", regulator->uA_load); | |
280 | } | |
281 | ||
282 | static ssize_t regulator_uV_show(struct device *dev, | |
283 | struct device_attribute *attr, char *buf) | |
284 | { | |
a5766f11 | 285 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
286 | ssize_t ret; |
287 | ||
288 | mutex_lock(&rdev->mutex); | |
289 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
290 | mutex_unlock(&rdev->mutex); | |
291 | ||
292 | return ret; | |
293 | } | |
7ad68e2f | 294 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
295 | |
296 | static ssize_t regulator_uA_show(struct device *dev, | |
297 | struct device_attribute *attr, char *buf) | |
298 | { | |
a5766f11 | 299 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
300 | |
301 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
302 | } | |
7ad68e2f | 303 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 304 | |
bc558a60 MB |
305 | static ssize_t regulator_name_show(struct device *dev, |
306 | struct device_attribute *attr, char *buf) | |
307 | { | |
308 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 309 | |
1083c393 | 310 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
311 | } |
312 | ||
4fca9545 | 313 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 314 | { |
414c70cb LG |
315 | switch (mode) { |
316 | case REGULATOR_MODE_FAST: | |
317 | return sprintf(buf, "fast\n"); | |
318 | case REGULATOR_MODE_NORMAL: | |
319 | return sprintf(buf, "normal\n"); | |
320 | case REGULATOR_MODE_IDLE: | |
321 | return sprintf(buf, "idle\n"); | |
322 | case REGULATOR_MODE_STANDBY: | |
323 | return sprintf(buf, "standby\n"); | |
324 | } | |
325 | return sprintf(buf, "unknown\n"); | |
326 | } | |
327 | ||
4fca9545 DB |
328 | static ssize_t regulator_opmode_show(struct device *dev, |
329 | struct device_attribute *attr, char *buf) | |
414c70cb | 330 | { |
a5766f11 | 331 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 332 | |
4fca9545 DB |
333 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
334 | } | |
7ad68e2f | 335 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
336 | |
337 | static ssize_t regulator_print_state(char *buf, int state) | |
338 | { | |
414c70cb LG |
339 | if (state > 0) |
340 | return sprintf(buf, "enabled\n"); | |
341 | else if (state == 0) | |
342 | return sprintf(buf, "disabled\n"); | |
343 | else | |
344 | return sprintf(buf, "unknown\n"); | |
345 | } | |
346 | ||
4fca9545 DB |
347 | static ssize_t regulator_state_show(struct device *dev, |
348 | struct device_attribute *attr, char *buf) | |
349 | { | |
350 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
351 | ssize_t ret; |
352 | ||
353 | mutex_lock(&rdev->mutex); | |
354 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
355 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 356 | |
9332546f | 357 | return ret; |
4fca9545 | 358 | } |
7ad68e2f | 359 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 360 | |
853116a1 DB |
361 | static ssize_t regulator_status_show(struct device *dev, |
362 | struct device_attribute *attr, char *buf) | |
363 | { | |
364 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
365 | int status; | |
366 | char *label; | |
367 | ||
368 | status = rdev->desc->ops->get_status(rdev); | |
369 | if (status < 0) | |
370 | return status; | |
371 | ||
372 | switch (status) { | |
373 | case REGULATOR_STATUS_OFF: | |
374 | label = "off"; | |
375 | break; | |
376 | case REGULATOR_STATUS_ON: | |
377 | label = "on"; | |
378 | break; | |
379 | case REGULATOR_STATUS_ERROR: | |
380 | label = "error"; | |
381 | break; | |
382 | case REGULATOR_STATUS_FAST: | |
383 | label = "fast"; | |
384 | break; | |
385 | case REGULATOR_STATUS_NORMAL: | |
386 | label = "normal"; | |
387 | break; | |
388 | case REGULATOR_STATUS_IDLE: | |
389 | label = "idle"; | |
390 | break; | |
391 | case REGULATOR_STATUS_STANDBY: | |
392 | label = "standby"; | |
393 | break; | |
394 | default: | |
395 | return -ERANGE; | |
396 | } | |
397 | ||
398 | return sprintf(buf, "%s\n", label); | |
399 | } | |
400 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
401 | ||
414c70cb LG |
402 | static ssize_t regulator_min_uA_show(struct device *dev, |
403 | struct device_attribute *attr, char *buf) | |
404 | { | |
a5766f11 | 405 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
406 | |
407 | if (!rdev->constraints) | |
408 | return sprintf(buf, "constraint not defined\n"); | |
409 | ||
410 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
411 | } | |
7ad68e2f | 412 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
413 | |
414 | static ssize_t regulator_max_uA_show(struct device *dev, | |
415 | struct device_attribute *attr, char *buf) | |
416 | { | |
a5766f11 | 417 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
418 | |
419 | if (!rdev->constraints) | |
420 | return sprintf(buf, "constraint not defined\n"); | |
421 | ||
422 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
423 | } | |
7ad68e2f | 424 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
425 | |
426 | static ssize_t regulator_min_uV_show(struct device *dev, | |
427 | struct device_attribute *attr, char *buf) | |
428 | { | |
a5766f11 | 429 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
430 | |
431 | if (!rdev->constraints) | |
432 | return sprintf(buf, "constraint not defined\n"); | |
433 | ||
434 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
435 | } | |
7ad68e2f | 436 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
437 | |
438 | static ssize_t regulator_max_uV_show(struct device *dev, | |
439 | struct device_attribute *attr, char *buf) | |
440 | { | |
a5766f11 | 441 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
442 | |
443 | if (!rdev->constraints) | |
444 | return sprintf(buf, "constraint not defined\n"); | |
445 | ||
446 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
447 | } | |
7ad68e2f | 448 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
449 | |
450 | static ssize_t regulator_total_uA_show(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
454 | struct regulator *regulator; |
455 | int uA = 0; | |
456 | ||
457 | mutex_lock(&rdev->mutex); | |
458 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 459 | uA += regulator->uA_load; |
414c70cb LG |
460 | mutex_unlock(&rdev->mutex); |
461 | return sprintf(buf, "%d\n", uA); | |
462 | } | |
7ad68e2f | 463 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
464 | |
465 | static ssize_t regulator_num_users_show(struct device *dev, | |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
a5766f11 | 468 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
469 | return sprintf(buf, "%d\n", rdev->use_count); |
470 | } | |
471 | ||
472 | static ssize_t regulator_type_show(struct device *dev, | |
473 | struct device_attribute *attr, char *buf) | |
474 | { | |
a5766f11 | 475 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
476 | |
477 | switch (rdev->desc->type) { | |
478 | case REGULATOR_VOLTAGE: | |
479 | return sprintf(buf, "voltage\n"); | |
480 | case REGULATOR_CURRENT: | |
481 | return sprintf(buf, "current\n"); | |
482 | } | |
483 | return sprintf(buf, "unknown\n"); | |
484 | } | |
485 | ||
486 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
487 | struct device_attribute *attr, char *buf) | |
488 | { | |
a5766f11 | 489 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 490 | |
414c70cb LG |
491 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
492 | } | |
7ad68e2f DB |
493 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
494 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
495 | |
496 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
497 | struct device_attribute *attr, char *buf) | |
498 | { | |
a5766f11 | 499 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 500 | |
414c70cb LG |
501 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
502 | } | |
7ad68e2f DB |
503 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
504 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
505 | |
506 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
507 | struct device_attribute *attr, char *buf) | |
508 | { | |
a5766f11 | 509 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 510 | |
414c70cb LG |
511 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
512 | } | |
7ad68e2f DB |
513 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
514 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 515 | |
414c70cb LG |
516 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
517 | struct device_attribute *attr, char *buf) | |
518 | { | |
a5766f11 | 519 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 520 | |
4fca9545 DB |
521 | return regulator_print_opmode(buf, |
522 | rdev->constraints->state_mem.mode); | |
414c70cb | 523 | } |
7ad68e2f DB |
524 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
525 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
526 | |
527 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
528 | struct device_attribute *attr, char *buf) | |
529 | { | |
a5766f11 | 530 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 531 | |
4fca9545 DB |
532 | return regulator_print_opmode(buf, |
533 | rdev->constraints->state_disk.mode); | |
414c70cb | 534 | } |
7ad68e2f DB |
535 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
536 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
537 | |
538 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
539 | struct device_attribute *attr, char *buf) | |
540 | { | |
a5766f11 | 541 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 542 | |
4fca9545 DB |
543 | return regulator_print_opmode(buf, |
544 | rdev->constraints->state_standby.mode); | |
414c70cb | 545 | } |
7ad68e2f DB |
546 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
547 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
548 | |
549 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
550 | struct device_attribute *attr, char *buf) | |
551 | { | |
a5766f11 | 552 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 553 | |
4fca9545 DB |
554 | return regulator_print_state(buf, |
555 | rdev->constraints->state_mem.enabled); | |
414c70cb | 556 | } |
7ad68e2f DB |
557 | static DEVICE_ATTR(suspend_mem_state, 0444, |
558 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
559 | |
560 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
561 | struct device_attribute *attr, char *buf) | |
562 | { | |
a5766f11 | 563 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 564 | |
4fca9545 DB |
565 | return regulator_print_state(buf, |
566 | rdev->constraints->state_disk.enabled); | |
414c70cb | 567 | } |
7ad68e2f DB |
568 | static DEVICE_ATTR(suspend_disk_state, 0444, |
569 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
570 | |
571 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
572 | struct device_attribute *attr, char *buf) | |
573 | { | |
a5766f11 | 574 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 575 | |
4fca9545 DB |
576 | return regulator_print_state(buf, |
577 | rdev->constraints->state_standby.enabled); | |
414c70cb | 578 | } |
7ad68e2f DB |
579 | static DEVICE_ATTR(suspend_standby_state, 0444, |
580 | regulator_suspend_standby_state_show, NULL); | |
581 | ||
bc558a60 | 582 | |
7ad68e2f DB |
583 | /* |
584 | * These are the only attributes are present for all regulators. | |
585 | * Other attributes are a function of regulator functionality. | |
586 | */ | |
414c70cb | 587 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 588 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
589 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
590 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
591 | __ATTR_NULL, |
592 | }; | |
593 | ||
594 | static void regulator_dev_release(struct device *dev) | |
595 | { | |
a5766f11 | 596 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
597 | kfree(rdev); |
598 | } | |
599 | ||
600 | static struct class regulator_class = { | |
601 | .name = "regulator", | |
602 | .dev_release = regulator_dev_release, | |
603 | .dev_attrs = regulator_dev_attrs, | |
604 | }; | |
605 | ||
606 | /* Calculate the new optimum regulator operating mode based on the new total | |
607 | * consumer load. All locks held by caller */ | |
608 | static void drms_uA_update(struct regulator_dev *rdev) | |
609 | { | |
610 | struct regulator *sibling; | |
611 | int current_uA = 0, output_uV, input_uV, err; | |
612 | unsigned int mode; | |
613 | ||
614 | err = regulator_check_drms(rdev); | |
615 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
616 | (!rdev->desc->ops->get_voltage && |
617 | !rdev->desc->ops->get_voltage_sel) || | |
618 | !rdev->desc->ops->set_mode) | |
036de8ef | 619 | return; |
414c70cb LG |
620 | |
621 | /* get output voltage */ | |
1bf5a1f8 | 622 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
623 | if (output_uV <= 0) |
624 | return; | |
625 | ||
626 | /* get input voltage */ | |
1bf5a1f8 MB |
627 | input_uV = 0; |
628 | if (rdev->supply) | |
629 | input_uV = _regulator_get_voltage(rdev); | |
630 | if (input_uV <= 0) | |
414c70cb LG |
631 | input_uV = rdev->constraints->input_uV; |
632 | if (input_uV <= 0) | |
633 | return; | |
634 | ||
635 | /* calc total requested load */ | |
636 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 637 | current_uA += sibling->uA_load; |
414c70cb LG |
638 | |
639 | /* now get the optimum mode for our new total regulator load */ | |
640 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
641 | output_uV, current_uA); | |
642 | ||
643 | /* check the new mode is allowed */ | |
2c608234 | 644 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
645 | if (err == 0) |
646 | rdev->desc->ops->set_mode(rdev, mode); | |
647 | } | |
648 | ||
649 | static int suspend_set_state(struct regulator_dev *rdev, | |
650 | struct regulator_state *rstate) | |
651 | { | |
652 | int ret = 0; | |
638f85c5 MB |
653 | bool can_set_state; |
654 | ||
655 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
656 | rdev->desc->ops->set_suspend_disable; | |
657 | ||
658 | /* If we have no suspend mode configration don't set anything; | |
659 | * only warn if the driver actually makes the suspend mode | |
660 | * configurable. | |
661 | */ | |
662 | if (!rstate->enabled && !rstate->disabled) { | |
663 | if (can_set_state) | |
5da84fd9 | 664 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
665 | return 0; |
666 | } | |
667 | ||
668 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 669 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
670 | return -EINVAL; |
671 | } | |
414c70cb | 672 | |
638f85c5 | 673 | if (!can_set_state) { |
5da84fd9 | 674 | rdev_err(rdev, "no way to set suspend state\n"); |
414c70cb | 675 | return -EINVAL; |
a5766f11 | 676 | } |
414c70cb LG |
677 | |
678 | if (rstate->enabled) | |
679 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
680 | else | |
681 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
682 | if (ret < 0) { | |
5da84fd9 | 683 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
684 | return ret; |
685 | } | |
686 | ||
687 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
688 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
689 | if (ret < 0) { | |
5da84fd9 | 690 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
691 | return ret; |
692 | } | |
693 | } | |
694 | ||
695 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
696 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
697 | if (ret < 0) { | |
5da84fd9 | 698 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
699 | return ret; |
700 | } | |
701 | } | |
702 | return ret; | |
703 | } | |
704 | ||
705 | /* locks held by caller */ | |
706 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
707 | { | |
708 | if (!rdev->constraints) | |
709 | return -EINVAL; | |
710 | ||
711 | switch (state) { | |
712 | case PM_SUSPEND_STANDBY: | |
713 | return suspend_set_state(rdev, | |
714 | &rdev->constraints->state_standby); | |
715 | case PM_SUSPEND_MEM: | |
716 | return suspend_set_state(rdev, | |
717 | &rdev->constraints->state_mem); | |
718 | case PM_SUSPEND_MAX: | |
719 | return suspend_set_state(rdev, | |
720 | &rdev->constraints->state_disk); | |
721 | default: | |
722 | return -EINVAL; | |
723 | } | |
724 | } | |
725 | ||
726 | static void print_constraints(struct regulator_dev *rdev) | |
727 | { | |
728 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 729 | char buf[80] = ""; |
8f031b48 MB |
730 | int count = 0; |
731 | int ret; | |
414c70cb | 732 | |
8f031b48 | 733 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 734 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
735 | count += sprintf(buf + count, "%d mV ", |
736 | constraints->min_uV / 1000); | |
414c70cb | 737 | else |
8f031b48 MB |
738 | count += sprintf(buf + count, "%d <--> %d mV ", |
739 | constraints->min_uV / 1000, | |
740 | constraints->max_uV / 1000); | |
741 | } | |
742 | ||
743 | if (!constraints->min_uV || | |
744 | constraints->min_uV != constraints->max_uV) { | |
745 | ret = _regulator_get_voltage(rdev); | |
746 | if (ret > 0) | |
747 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
748 | } | |
749 | ||
bf5892a8 MB |
750 | if (constraints->uV_offset) |
751 | count += sprintf(buf, "%dmV offset ", | |
752 | constraints->uV_offset / 1000); | |
753 | ||
8f031b48 | 754 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 755 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
756 | count += sprintf(buf + count, "%d mA ", |
757 | constraints->min_uA / 1000); | |
414c70cb | 758 | else |
8f031b48 MB |
759 | count += sprintf(buf + count, "%d <--> %d mA ", |
760 | constraints->min_uA / 1000, | |
761 | constraints->max_uA / 1000); | |
762 | } | |
763 | ||
764 | if (!constraints->min_uA || | |
765 | constraints->min_uA != constraints->max_uA) { | |
766 | ret = _regulator_get_current_limit(rdev); | |
767 | if (ret > 0) | |
e4a6376b | 768 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 769 | } |
8f031b48 | 770 | |
414c70cb LG |
771 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
772 | count += sprintf(buf + count, "fast "); | |
773 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
774 | count += sprintf(buf + count, "normal "); | |
775 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
776 | count += sprintf(buf + count, "idle "); | |
777 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
778 | count += sprintf(buf + count, "standby"); | |
779 | ||
13ce29f8 | 780 | rdev_info(rdev, "%s\n", buf); |
414c70cb LG |
781 | } |
782 | ||
e79055d6 | 783 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 784 | struct regulation_constraints *constraints) |
a5766f11 | 785 | { |
e5fda26c | 786 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
787 | int ret; |
788 | ||
789 | /* do we need to apply the constraint voltage */ | |
790 | if (rdev->constraints->apply_uV && | |
75790251 MB |
791 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
792 | ret = _regulator_do_set_voltage(rdev, | |
793 | rdev->constraints->min_uV, | |
794 | rdev->constraints->max_uV); | |
795 | if (ret < 0) { | |
796 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
797 | rdev->constraints->min_uV); | |
75790251 MB |
798 | return ret; |
799 | } | |
af5866c9 | 800 | } |
e06f5b4f | 801 | |
4367cfdc DB |
802 | /* constrain machine-level voltage specs to fit |
803 | * the actual range supported by this regulator. | |
804 | */ | |
805 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
806 | int count = rdev->desc->n_voltages; | |
807 | int i; | |
808 | int min_uV = INT_MAX; | |
809 | int max_uV = INT_MIN; | |
810 | int cmin = constraints->min_uV; | |
811 | int cmax = constraints->max_uV; | |
812 | ||
3e590918 MB |
813 | /* it's safe to autoconfigure fixed-voltage supplies |
814 | and the constraints are used by list_voltage. */ | |
4367cfdc | 815 | if (count == 1 && !cmin) { |
3e590918 | 816 | cmin = 1; |
4367cfdc | 817 | cmax = INT_MAX; |
3e590918 MB |
818 | constraints->min_uV = cmin; |
819 | constraints->max_uV = cmax; | |
4367cfdc DB |
820 | } |
821 | ||
3e2b9abd MB |
822 | /* voltage constraints are optional */ |
823 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 824 | return 0; |
3e2b9abd | 825 | |
4367cfdc | 826 | /* else require explicit machine-level constraints */ |
3e2b9abd | 827 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 828 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 829 | return -EINVAL; |
4367cfdc DB |
830 | } |
831 | ||
832 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
833 | for (i = 0; i < count; i++) { | |
834 | int value; | |
835 | ||
836 | value = ops->list_voltage(rdev, i); | |
837 | if (value <= 0) | |
838 | continue; | |
839 | ||
840 | /* maybe adjust [min_uV..max_uV] */ | |
841 | if (value >= cmin && value < min_uV) | |
842 | min_uV = value; | |
843 | if (value <= cmax && value > max_uV) | |
844 | max_uV = value; | |
845 | } | |
846 | ||
847 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
848 | if (max_uV < min_uV) { | |
5da84fd9 | 849 | rdev_err(rdev, "unsupportable voltage constraints\n"); |
e79055d6 | 850 | return -EINVAL; |
4367cfdc DB |
851 | } |
852 | ||
853 | /* use regulator's subset of machine constraints */ | |
854 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
855 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
856 | constraints->min_uV, min_uV); | |
4367cfdc DB |
857 | constraints->min_uV = min_uV; |
858 | } | |
859 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
860 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
861 | constraints->max_uV, max_uV); | |
4367cfdc DB |
862 | constraints->max_uV = max_uV; |
863 | } | |
864 | } | |
865 | ||
e79055d6 MB |
866 | return 0; |
867 | } | |
868 | ||
869 | /** | |
870 | * set_machine_constraints - sets regulator constraints | |
871 | * @rdev: regulator source | |
872 | * @constraints: constraints to apply | |
873 | * | |
874 | * Allows platform initialisation code to define and constrain | |
875 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
876 | * Constraints *must* be set by platform code in order for some | |
877 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
878 | * set_mode. | |
879 | */ | |
880 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 881 | const struct regulation_constraints *constraints) |
e79055d6 MB |
882 | { |
883 | int ret = 0; | |
e79055d6 MB |
884 | struct regulator_ops *ops = rdev->desc->ops; |
885 | ||
f8c12fe3 MB |
886 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), |
887 | GFP_KERNEL); | |
888 | if (!rdev->constraints) | |
889 | return -ENOMEM; | |
af5866c9 | 890 | |
f8c12fe3 | 891 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
892 | if (ret != 0) |
893 | goto out; | |
894 | ||
a5766f11 | 895 | /* do we need to setup our suspend state */ |
e06f5b4f | 896 | if (constraints->initial_state) { |
f8c12fe3 | 897 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 898 | if (ret < 0) { |
5da84fd9 | 899 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
900 | goto out; |
901 | } | |
902 | } | |
a5766f11 | 903 | |
a308466c MB |
904 | if (constraints->initial_mode) { |
905 | if (!ops->set_mode) { | |
5da84fd9 | 906 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
907 | ret = -EINVAL; |
908 | goto out; | |
909 | } | |
910 | ||
f8c12fe3 | 911 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 912 | if (ret < 0) { |
5da84fd9 | 913 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
914 | goto out; |
915 | } | |
916 | } | |
917 | ||
cacf90f2 MB |
918 | /* If the constraints say the regulator should be on at this point |
919 | * and we have control then make sure it is enabled. | |
920 | */ | |
f8c12fe3 MB |
921 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
922 | ops->enable) { | |
e5fda26c MB |
923 | ret = ops->enable(rdev); |
924 | if (ret < 0) { | |
5da84fd9 | 925 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
926 | goto out; |
927 | } | |
928 | } | |
929 | ||
a5766f11 | 930 | print_constraints(rdev); |
1a6958e7 | 931 | return 0; |
a5766f11 | 932 | out: |
1a6958e7 AL |
933 | kfree(rdev->constraints); |
934 | rdev->constraints = NULL; | |
a5766f11 LG |
935 | return ret; |
936 | } | |
937 | ||
938 | /** | |
939 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
940 | * @rdev: regulator name |
941 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
942 | * |
943 | * Called by platform initialisation code to set the supply regulator for this | |
944 | * regulator. This ensures that a regulators supply will also be enabled by the | |
945 | * core if it's child is enabled. | |
946 | */ | |
947 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 948 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
949 | { |
950 | int err; | |
951 | ||
3801b86a MB |
952 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
953 | ||
954 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
955 | if (IS_ERR(rdev->supply)) { | |
956 | err = PTR_ERR(rdev->supply); | |
957 | rdev->supply = NULL; | |
958 | return err; | |
a5766f11 | 959 | } |
3801b86a MB |
960 | |
961 | return 0; | |
a5766f11 LG |
962 | } |
963 | ||
964 | /** | |
06c63f93 | 965 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 MB |
966 | * @rdev: regulator source |
967 | * @consumer_dev: device the supply applies to | |
40f9244f | 968 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 969 | * @supply: symbolic name for supply |
a5766f11 LG |
970 | * |
971 | * Allows platform initialisation code to map physical regulator | |
972 | * sources to symbolic names for supplies for use by devices. Devices | |
973 | * should use these symbolic names to request regulators, avoiding the | |
974 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
975 | * |
976 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
977 | */ |
978 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
979 | struct device *consumer_dev, const char *consumer_dev_name, |
980 | const char *supply) | |
a5766f11 LG |
981 | { |
982 | struct regulator_map *node; | |
9ed2099e | 983 | int has_dev; |
a5766f11 | 984 | |
40f9244f MB |
985 | if (consumer_dev && consumer_dev_name) |
986 | return -EINVAL; | |
987 | ||
988 | if (!consumer_dev_name && consumer_dev) | |
989 | consumer_dev_name = dev_name(consumer_dev); | |
990 | ||
a5766f11 LG |
991 | if (supply == NULL) |
992 | return -EINVAL; | |
993 | ||
9ed2099e MB |
994 | if (consumer_dev_name != NULL) |
995 | has_dev = 1; | |
996 | else | |
997 | has_dev = 0; | |
998 | ||
6001e13c | 999 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1000 | if (node->dev_name && consumer_dev_name) { |
1001 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1002 | continue; | |
1003 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1004 | continue; |
23b5cc2a JN |
1005 | } |
1006 | ||
6001e13c DB |
1007 | if (strcmp(node->supply, supply) != 0) |
1008 | continue; | |
1009 | ||
1010 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
5da84fd9 JP |
1011 | dev_name(&node->regulator->dev), |
1012 | node->regulator->desc->name, | |
1013 | supply, | |
1014 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1015 | return -EBUSY; |
1016 | } | |
1017 | ||
9ed2099e | 1018 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1019 | if (node == NULL) |
1020 | return -ENOMEM; | |
1021 | ||
1022 | node->regulator = rdev; | |
a5766f11 LG |
1023 | node->supply = supply; |
1024 | ||
9ed2099e MB |
1025 | if (has_dev) { |
1026 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1027 | if (node->dev_name == NULL) { | |
1028 | kfree(node); | |
1029 | return -ENOMEM; | |
1030 | } | |
40f9244f MB |
1031 | } |
1032 | ||
a5766f11 LG |
1033 | list_add(&node->list, ®ulator_map_list); |
1034 | return 0; | |
1035 | } | |
1036 | ||
0f1d747b MR |
1037 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1038 | { | |
1039 | struct regulator_map *node, *n; | |
1040 | ||
1041 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1042 | if (rdev == node->regulator) { | |
1043 | list_del(&node->list); | |
40f9244f | 1044 | kfree(node->dev_name); |
0f1d747b | 1045 | kfree(node); |
0f1d747b MR |
1046 | } |
1047 | } | |
1048 | } | |
1049 | ||
f5726ae3 | 1050 | #define REG_STR_SIZE 64 |
414c70cb LG |
1051 | |
1052 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1053 | struct device *dev, | |
1054 | const char *supply_name) | |
1055 | { | |
1056 | struct regulator *regulator; | |
1057 | char buf[REG_STR_SIZE]; | |
1058 | int err, size; | |
1059 | ||
1060 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1061 | if (regulator == NULL) | |
1062 | return NULL; | |
1063 | ||
1064 | mutex_lock(&rdev->mutex); | |
1065 | regulator->rdev = rdev; | |
1066 | list_add(®ulator->list, &rdev->consumer_list); | |
1067 | ||
1068 | if (dev) { | |
1069 | /* create a 'requested_microamps_name' sysfs entry */ | |
e0eaedef MB |
1070 | size = scnprintf(buf, REG_STR_SIZE, |
1071 | "microamps_requested_%s-%s", | |
1072 | dev_name(dev), supply_name); | |
414c70cb LG |
1073 | if (size >= REG_STR_SIZE) |
1074 | goto overflow_err; | |
1075 | ||
1076 | regulator->dev = dev; | |
4f26a2ab | 1077 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1078 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1079 | if (regulator->dev_attr.attr.name == NULL) | |
1080 | goto attr_name_err; | |
1081 | ||
414c70cb LG |
1082 | regulator->dev_attr.attr.mode = 0444; |
1083 | regulator->dev_attr.show = device_requested_uA_show; | |
1084 | err = device_create_file(dev, ®ulator->dev_attr); | |
1085 | if (err < 0) { | |
5da84fd9 | 1086 | rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); |
414c70cb LG |
1087 | goto attr_name_err; |
1088 | } | |
1089 | ||
1090 | /* also add a link to the device sysfs entry */ | |
1091 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1092 | dev->kobj.name, supply_name); | |
1093 | if (size >= REG_STR_SIZE) | |
1094 | goto attr_err; | |
1095 | ||
1096 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1097 | if (regulator->supply_name == NULL) | |
1098 | goto attr_err; | |
1099 | ||
1100 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1101 | buf); | |
1102 | if (err) { | |
5da84fd9 JP |
1103 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1104 | dev->kobj.name, err); | |
414c70cb LG |
1105 | goto link_name_err; |
1106 | } | |
5de70519 MB |
1107 | } else { |
1108 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1109 | if (regulator->supply_name == NULL) | |
1110 | goto attr_err; | |
1111 | } | |
1112 | ||
1113 | #ifdef CONFIG_DEBUG_FS | |
1114 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, | |
1115 | rdev->debugfs); | |
1116 | if (IS_ERR_OR_NULL(regulator->debugfs)) { | |
1117 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
1118 | regulator->debugfs = NULL; | |
1119 | } else { | |
1120 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1121 | ®ulator->uA_load); | |
1122 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1123 | ®ulator->min_uV); | |
1124 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1125 | ®ulator->max_uV); | |
414c70cb | 1126 | } |
5de70519 MB |
1127 | #endif |
1128 | ||
414c70cb LG |
1129 | mutex_unlock(&rdev->mutex); |
1130 | return regulator; | |
1131 | link_name_err: | |
1132 | kfree(regulator->supply_name); | |
1133 | attr_err: | |
1134 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1135 | attr_name_err: | |
1136 | kfree(regulator->dev_attr.attr.name); | |
1137 | overflow_err: | |
1138 | list_del(®ulator->list); | |
1139 | kfree(regulator); | |
1140 | mutex_unlock(&rdev->mutex); | |
1141 | return NULL; | |
1142 | } | |
1143 | ||
31aae2be MB |
1144 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1145 | { | |
1146 | if (!rdev->desc->ops->enable_time) | |
1147 | return 0; | |
1148 | return rdev->desc->ops->enable_time(rdev); | |
1149 | } | |
1150 | ||
5ffbd136 MB |
1151 | /* Internal regulator request function */ |
1152 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1153 | int exclusive) | |
414c70cb LG |
1154 | { |
1155 | struct regulator_dev *rdev; | |
1156 | struct regulator_map *map; | |
1157 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1158 | const char *devname = NULL; |
5ffbd136 | 1159 | int ret; |
414c70cb LG |
1160 | |
1161 | if (id == NULL) { | |
5da84fd9 | 1162 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1163 | return regulator; |
1164 | } | |
1165 | ||
40f9244f MB |
1166 | if (dev) |
1167 | devname = dev_name(dev); | |
1168 | ||
414c70cb LG |
1169 | mutex_lock(®ulator_list_mutex); |
1170 | ||
1171 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1172 | /* If the mapping has a device set up it must match */ |
1173 | if (map->dev_name && | |
1174 | (!devname || strcmp(map->dev_name, devname))) | |
1175 | continue; | |
1176 | ||
1177 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1178 | rdev = map->regulator; |
414c70cb | 1179 | goto found; |
a5766f11 | 1180 | } |
414c70cb | 1181 | } |
34abbd68 | 1182 | |
688fe99a MB |
1183 | if (board_wants_dummy_regulator) { |
1184 | rdev = dummy_regulator_rdev; | |
1185 | goto found; | |
1186 | } | |
1187 | ||
34abbd68 MB |
1188 | #ifdef CONFIG_REGULATOR_DUMMY |
1189 | if (!devname) | |
1190 | devname = "deviceless"; | |
1191 | ||
1192 | /* If the board didn't flag that it was fully constrained then | |
1193 | * substitute in a dummy regulator so consumers can continue. | |
1194 | */ | |
1195 | if (!has_full_constraints) { | |
5da84fd9 JP |
1196 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1197 | devname, id); | |
34abbd68 MB |
1198 | rdev = dummy_regulator_rdev; |
1199 | goto found; | |
1200 | } | |
1201 | #endif | |
1202 | ||
414c70cb LG |
1203 | mutex_unlock(®ulator_list_mutex); |
1204 | return regulator; | |
1205 | ||
1206 | found: | |
5ffbd136 MB |
1207 | if (rdev->exclusive) { |
1208 | regulator = ERR_PTR(-EPERM); | |
1209 | goto out; | |
1210 | } | |
1211 | ||
1212 | if (exclusive && rdev->open_count) { | |
1213 | regulator = ERR_PTR(-EBUSY); | |
1214 | goto out; | |
1215 | } | |
1216 | ||
a5766f11 LG |
1217 | if (!try_module_get(rdev->owner)) |
1218 | goto out; | |
1219 | ||
414c70cb LG |
1220 | regulator = create_regulator(rdev, dev, id); |
1221 | if (regulator == NULL) { | |
1222 | regulator = ERR_PTR(-ENOMEM); | |
1223 | module_put(rdev->owner); | |
1224 | } | |
1225 | ||
5ffbd136 MB |
1226 | rdev->open_count++; |
1227 | if (exclusive) { | |
1228 | rdev->exclusive = 1; | |
1229 | ||
1230 | ret = _regulator_is_enabled(rdev); | |
1231 | if (ret > 0) | |
1232 | rdev->use_count = 1; | |
1233 | else | |
1234 | rdev->use_count = 0; | |
1235 | } | |
1236 | ||
a5766f11 | 1237 | out: |
414c70cb | 1238 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1239 | |
414c70cb LG |
1240 | return regulator; |
1241 | } | |
5ffbd136 MB |
1242 | |
1243 | /** | |
1244 | * regulator_get - lookup and obtain a reference to a regulator. | |
1245 | * @dev: device for regulator "consumer" | |
1246 | * @id: Supply name or regulator ID. | |
1247 | * | |
1248 | * Returns a struct regulator corresponding to the regulator producer, | |
1249 | * or IS_ERR() condition containing errno. | |
1250 | * | |
1251 | * Use of supply names configured via regulator_set_device_supply() is | |
1252 | * strongly encouraged. It is recommended that the supply name used | |
1253 | * should match the name used for the supply and/or the relevant | |
1254 | * device pins in the datasheet. | |
1255 | */ | |
1256 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1257 | { | |
1258 | return _regulator_get(dev, id, 0); | |
1259 | } | |
414c70cb LG |
1260 | EXPORT_SYMBOL_GPL(regulator_get); |
1261 | ||
5ffbd136 MB |
1262 | /** |
1263 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1264 | * @dev: device for regulator "consumer" | |
1265 | * @id: Supply name or regulator ID. | |
1266 | * | |
1267 | * Returns a struct regulator corresponding to the regulator producer, | |
1268 | * or IS_ERR() condition containing errno. Other consumers will be | |
1269 | * unable to obtain this reference is held and the use count for the | |
1270 | * regulator will be initialised to reflect the current state of the | |
1271 | * regulator. | |
1272 | * | |
1273 | * This is intended for use by consumers which cannot tolerate shared | |
1274 | * use of the regulator such as those which need to force the | |
1275 | * regulator off for correct operation of the hardware they are | |
1276 | * controlling. | |
1277 | * | |
1278 | * Use of supply names configured via regulator_set_device_supply() is | |
1279 | * strongly encouraged. It is recommended that the supply name used | |
1280 | * should match the name used for the supply and/or the relevant | |
1281 | * device pins in the datasheet. | |
1282 | */ | |
1283 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1284 | { | |
1285 | return _regulator_get(dev, id, 1); | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1288 | ||
414c70cb LG |
1289 | /** |
1290 | * regulator_put - "free" the regulator source | |
1291 | * @regulator: regulator source | |
1292 | * | |
1293 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1294 | * regulator source are balanced by regulator_disable calls prior to calling | |
1295 | * this function. | |
1296 | */ | |
1297 | void regulator_put(struct regulator *regulator) | |
1298 | { | |
1299 | struct regulator_dev *rdev; | |
1300 | ||
1301 | if (regulator == NULL || IS_ERR(regulator)) | |
1302 | return; | |
1303 | ||
414c70cb LG |
1304 | mutex_lock(®ulator_list_mutex); |
1305 | rdev = regulator->rdev; | |
1306 | ||
5de70519 MB |
1307 | #ifdef CONFIG_DEBUG_FS |
1308 | debugfs_remove_recursive(regulator->debugfs); | |
1309 | #endif | |
1310 | ||
414c70cb LG |
1311 | /* remove any sysfs entries */ |
1312 | if (regulator->dev) { | |
1313 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
414c70cb LG |
1314 | device_remove_file(regulator->dev, ®ulator->dev_attr); |
1315 | kfree(regulator->dev_attr.attr.name); | |
1316 | } | |
5de70519 | 1317 | kfree(regulator->supply_name); |
414c70cb LG |
1318 | list_del(®ulator->list); |
1319 | kfree(regulator); | |
1320 | ||
5ffbd136 MB |
1321 | rdev->open_count--; |
1322 | rdev->exclusive = 0; | |
1323 | ||
414c70cb LG |
1324 | module_put(rdev->owner); |
1325 | mutex_unlock(®ulator_list_mutex); | |
1326 | } | |
1327 | EXPORT_SYMBOL_GPL(regulator_put); | |
1328 | ||
9a2372fa MB |
1329 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1330 | { | |
1331 | if (!rdev->constraints) | |
1332 | return 0; | |
1333 | ||
1334 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1335 | return 1; | |
1336 | else | |
1337 | return 0; | |
1338 | } | |
1339 | ||
414c70cb LG |
1340 | /* locks held by regulator_enable() */ |
1341 | static int _regulator_enable(struct regulator_dev *rdev) | |
1342 | { | |
31aae2be | 1343 | int ret, delay; |
414c70cb | 1344 | |
414c70cb | 1345 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1346 | if (rdev->constraints && |
1347 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1348 | drms_uA_update(rdev); | |
414c70cb | 1349 | |
9a2372fa MB |
1350 | if (rdev->use_count == 0) { |
1351 | /* The regulator may on if it's not switchable or left on */ | |
1352 | ret = _regulator_is_enabled(rdev); | |
1353 | if (ret == -EINVAL || ret == 0) { | |
1354 | if (!_regulator_can_change_status(rdev)) | |
1355 | return -EPERM; | |
1356 | ||
31aae2be | 1357 | if (!rdev->desc->ops->enable) |
9a2372fa | 1358 | return -EINVAL; |
31aae2be MB |
1359 | |
1360 | /* Query before enabling in case configuration | |
25985edc | 1361 | * dependent. */ |
31aae2be MB |
1362 | ret = _regulator_get_enable_time(rdev); |
1363 | if (ret >= 0) { | |
1364 | delay = ret; | |
1365 | } else { | |
5da84fd9 | 1366 | rdev_warn(rdev, "enable_time() failed: %d\n", |
1d7372e1 | 1367 | ret); |
31aae2be | 1368 | delay = 0; |
9a2372fa | 1369 | } |
31aae2be | 1370 | |
02fa3ec0 MB |
1371 | trace_regulator_enable(rdev_get_name(rdev)); |
1372 | ||
31aae2be MB |
1373 | /* Allow the regulator to ramp; it would be useful |
1374 | * to extend this for bulk operations so that the | |
1375 | * regulators can ramp together. */ | |
1376 | ret = rdev->desc->ops->enable(rdev); | |
1377 | if (ret < 0) | |
1378 | return ret; | |
1379 | ||
02fa3ec0 MB |
1380 | trace_regulator_enable_delay(rdev_get_name(rdev)); |
1381 | ||
e36c1df8 | 1382 | if (delay >= 1000) { |
31aae2be | 1383 | mdelay(delay / 1000); |
e36c1df8 AL |
1384 | udelay(delay % 1000); |
1385 | } else if (delay) { | |
31aae2be | 1386 | udelay(delay); |
e36c1df8 | 1387 | } |
31aae2be | 1388 | |
02fa3ec0 MB |
1389 | trace_regulator_enable_complete(rdev_get_name(rdev)); |
1390 | ||
a7433cff | 1391 | } else if (ret < 0) { |
5da84fd9 | 1392 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1393 | return ret; |
1394 | } | |
a7433cff | 1395 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1396 | } |
1397 | ||
9a2372fa MB |
1398 | rdev->use_count++; |
1399 | ||
1400 | return 0; | |
414c70cb LG |
1401 | } |
1402 | ||
1403 | /** | |
1404 | * regulator_enable - enable regulator output | |
1405 | * @regulator: regulator source | |
1406 | * | |
cf7bbcdf MB |
1407 | * Request that the regulator be enabled with the regulator output at |
1408 | * the predefined voltage or current value. Calls to regulator_enable() | |
1409 | * must be balanced with calls to regulator_disable(). | |
1410 | * | |
414c70cb | 1411 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1412 | * hardwired in the regulator. |
414c70cb LG |
1413 | */ |
1414 | int regulator_enable(struct regulator *regulator) | |
1415 | { | |
412aec61 DB |
1416 | struct regulator_dev *rdev = regulator->rdev; |
1417 | int ret = 0; | |
414c70cb | 1418 | |
3801b86a MB |
1419 | if (rdev->supply) { |
1420 | ret = regulator_enable(rdev->supply); | |
1421 | if (ret != 0) | |
1422 | return ret; | |
1423 | } | |
1424 | ||
412aec61 | 1425 | mutex_lock(&rdev->mutex); |
cd94b505 | 1426 | ret = _regulator_enable(rdev); |
412aec61 | 1427 | mutex_unlock(&rdev->mutex); |
3801b86a | 1428 | |
d1685e4e | 1429 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1430 | regulator_disable(rdev->supply); |
1431 | ||
414c70cb LG |
1432 | return ret; |
1433 | } | |
1434 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1435 | ||
1436 | /* locks held by regulator_disable() */ | |
3801b86a | 1437 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1438 | { |
1439 | int ret = 0; | |
1440 | ||
cd94b505 | 1441 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1442 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1443 | return -EIO; |
1444 | ||
414c70cb | 1445 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1446 | if (rdev->use_count == 1 && |
1447 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1448 | |
1449 | /* we are last user */ | |
9a2372fa MB |
1450 | if (_regulator_can_change_status(rdev) && |
1451 | rdev->desc->ops->disable) { | |
02fa3ec0 MB |
1452 | trace_regulator_disable(rdev_get_name(rdev)); |
1453 | ||
414c70cb LG |
1454 | ret = rdev->desc->ops->disable(rdev); |
1455 | if (ret < 0) { | |
5da84fd9 | 1456 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1457 | return ret; |
1458 | } | |
84b68263 | 1459 | |
02fa3ec0 MB |
1460 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
1461 | ||
84b68263 MB |
1462 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
1463 | NULL); | |
414c70cb LG |
1464 | } |
1465 | ||
414c70cb LG |
1466 | rdev->use_count = 0; |
1467 | } else if (rdev->use_count > 1) { | |
1468 | ||
1469 | if (rdev->constraints && | |
1470 | (rdev->constraints->valid_ops_mask & | |
1471 | REGULATOR_CHANGE_DRMS)) | |
1472 | drms_uA_update(rdev); | |
1473 | ||
1474 | rdev->use_count--; | |
1475 | } | |
3801b86a | 1476 | |
414c70cb LG |
1477 | return ret; |
1478 | } | |
1479 | ||
1480 | /** | |
1481 | * regulator_disable - disable regulator output | |
1482 | * @regulator: regulator source | |
1483 | * | |
cf7bbcdf MB |
1484 | * Disable the regulator output voltage or current. Calls to |
1485 | * regulator_enable() must be balanced with calls to | |
1486 | * regulator_disable(). | |
69279fb9 | 1487 | * |
414c70cb | 1488 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1489 | * devices have it enabled, the regulator device supports disabling and |
1490 | * machine constraints permit this operation. | |
414c70cb LG |
1491 | */ |
1492 | int regulator_disable(struct regulator *regulator) | |
1493 | { | |
412aec61 DB |
1494 | struct regulator_dev *rdev = regulator->rdev; |
1495 | int ret = 0; | |
414c70cb | 1496 | |
412aec61 | 1497 | mutex_lock(&rdev->mutex); |
3801b86a | 1498 | ret = _regulator_disable(rdev); |
412aec61 | 1499 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1500 | |
3801b86a MB |
1501 | if (ret == 0 && rdev->supply) |
1502 | regulator_disable(rdev->supply); | |
8cbf811d | 1503 | |
414c70cb LG |
1504 | return ret; |
1505 | } | |
1506 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1507 | ||
1508 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1509 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1510 | { |
1511 | int ret = 0; | |
1512 | ||
1513 | /* force disable */ | |
1514 | if (rdev->desc->ops->disable) { | |
1515 | /* ah well, who wants to live forever... */ | |
1516 | ret = rdev->desc->ops->disable(rdev); | |
1517 | if (ret < 0) { | |
5da84fd9 | 1518 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1519 | return ret; |
1520 | } | |
1521 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1522 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1523 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1524 | } |
1525 | ||
414c70cb LG |
1526 | return ret; |
1527 | } | |
1528 | ||
1529 | /** | |
1530 | * regulator_force_disable - force disable regulator output | |
1531 | * @regulator: regulator source | |
1532 | * | |
1533 | * Forcibly disable the regulator output voltage or current. | |
1534 | * NOTE: this *will* disable the regulator output even if other consumer | |
1535 | * devices have it enabled. This should be used for situations when device | |
1536 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1537 | */ | |
1538 | int regulator_force_disable(struct regulator *regulator) | |
1539 | { | |
82d15839 | 1540 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1541 | int ret; |
1542 | ||
82d15839 | 1543 | mutex_lock(&rdev->mutex); |
414c70cb | 1544 | regulator->uA_load = 0; |
3801b86a | 1545 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1546 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1547 | |
3801b86a MB |
1548 | if (rdev->supply) |
1549 | while (rdev->open_count--) | |
1550 | regulator_disable(rdev->supply); | |
8cbf811d | 1551 | |
414c70cb LG |
1552 | return ret; |
1553 | } | |
1554 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1555 | ||
da07ecd9 MB |
1556 | static void regulator_disable_work(struct work_struct *work) |
1557 | { | |
1558 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1559 | disable_work.work); | |
1560 | int count, i, ret; | |
1561 | ||
1562 | mutex_lock(&rdev->mutex); | |
1563 | ||
1564 | BUG_ON(!rdev->deferred_disables); | |
1565 | ||
1566 | count = rdev->deferred_disables; | |
1567 | rdev->deferred_disables = 0; | |
1568 | ||
1569 | for (i = 0; i < count; i++) { | |
1570 | ret = _regulator_disable(rdev); | |
1571 | if (ret != 0) | |
1572 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1573 | } | |
1574 | ||
1575 | mutex_unlock(&rdev->mutex); | |
1576 | ||
1577 | if (rdev->supply) { | |
1578 | for (i = 0; i < count; i++) { | |
1579 | ret = regulator_disable(rdev->supply); | |
1580 | if (ret != 0) { | |
1581 | rdev_err(rdev, | |
1582 | "Supply disable failed: %d\n", ret); | |
1583 | } | |
1584 | } | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | /** | |
1589 | * regulator_disable_deferred - disable regulator output with delay | |
1590 | * @regulator: regulator source | |
1591 | * @ms: miliseconds until the regulator is disabled | |
1592 | * | |
1593 | * Execute regulator_disable() on the regulator after a delay. This | |
1594 | * is intended for use with devices that require some time to quiesce. | |
1595 | * | |
1596 | * NOTE: this will only disable the regulator output if no other consumer | |
1597 | * devices have it enabled, the regulator device supports disabling and | |
1598 | * machine constraints permit this operation. | |
1599 | */ | |
1600 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1601 | { | |
1602 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1603 | int ret; |
da07ecd9 MB |
1604 | |
1605 | mutex_lock(&rdev->mutex); | |
1606 | rdev->deferred_disables++; | |
1607 | mutex_unlock(&rdev->mutex); | |
1608 | ||
aa59802d MB |
1609 | ret = schedule_delayed_work(&rdev->disable_work, |
1610 | msecs_to_jiffies(ms)); | |
1611 | if (ret < 0) | |
1612 | return ret; | |
1613 | else | |
1614 | return 0; | |
da07ecd9 MB |
1615 | } |
1616 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1617 | ||
414c70cb LG |
1618 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1619 | { | |
9a7f6a4c | 1620 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1621 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1622 | return 1; |
414c70cb | 1623 | |
9332546f | 1624 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1625 | } |
1626 | ||
1627 | /** | |
1628 | * regulator_is_enabled - is the regulator output enabled | |
1629 | * @regulator: regulator source | |
1630 | * | |
412aec61 DB |
1631 | * Returns positive if the regulator driver backing the source/client |
1632 | * has requested that the device be enabled, zero if it hasn't, else a | |
1633 | * negative errno code. | |
1634 | * | |
1635 | * Note that the device backing this regulator handle can have multiple | |
1636 | * users, so it might be enabled even if regulator_enable() was never | |
1637 | * called for this particular source. | |
414c70cb LG |
1638 | */ |
1639 | int regulator_is_enabled(struct regulator *regulator) | |
1640 | { | |
9332546f MB |
1641 | int ret; |
1642 | ||
1643 | mutex_lock(®ulator->rdev->mutex); | |
1644 | ret = _regulator_is_enabled(regulator->rdev); | |
1645 | mutex_unlock(®ulator->rdev->mutex); | |
1646 | ||
1647 | return ret; | |
414c70cb LG |
1648 | } |
1649 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1650 | ||
4367cfdc DB |
1651 | /** |
1652 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1653 | * @regulator: regulator source | |
1654 | * | |
1655 | * Returns number of selectors, or negative errno. Selectors are | |
1656 | * numbered starting at zero, and typically correspond to bitfields | |
1657 | * in hardware registers. | |
1658 | */ | |
1659 | int regulator_count_voltages(struct regulator *regulator) | |
1660 | { | |
1661 | struct regulator_dev *rdev = regulator->rdev; | |
1662 | ||
1663 | return rdev->desc->n_voltages ? : -EINVAL; | |
1664 | } | |
1665 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1666 | ||
1667 | /** | |
1668 | * regulator_list_voltage - enumerate supported voltages | |
1669 | * @regulator: regulator source | |
1670 | * @selector: identify voltage to list | |
1671 | * Context: can sleep | |
1672 | * | |
1673 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1674 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1675 | * negative errno. |
1676 | */ | |
1677 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1678 | { | |
1679 | struct regulator_dev *rdev = regulator->rdev; | |
1680 | struct regulator_ops *ops = rdev->desc->ops; | |
1681 | int ret; | |
1682 | ||
1683 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1684 | return -EINVAL; | |
1685 | ||
1686 | mutex_lock(&rdev->mutex); | |
1687 | ret = ops->list_voltage(rdev, selector); | |
1688 | mutex_unlock(&rdev->mutex); | |
1689 | ||
1690 | if (ret > 0) { | |
1691 | if (ret < rdev->constraints->min_uV) | |
1692 | ret = 0; | |
1693 | else if (ret > rdev->constraints->max_uV) | |
1694 | ret = 0; | |
1695 | } | |
1696 | ||
1697 | return ret; | |
1698 | } | |
1699 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1700 | ||
a7a1ad90 MB |
1701 | /** |
1702 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1703 | * | |
1704 | * @regulator: Regulator to check. | |
1705 | * @min_uV: Minimum required voltage in uV. | |
1706 | * @max_uV: Maximum required voltage in uV. | |
1707 | * | |
1708 | * Returns a boolean or a negative error code. | |
1709 | */ | |
1710 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1711 | int min_uV, int max_uV) | |
1712 | { | |
1713 | int i, voltages, ret; | |
1714 | ||
1715 | ret = regulator_count_voltages(regulator); | |
1716 | if (ret < 0) | |
1717 | return ret; | |
1718 | voltages = ret; | |
1719 | ||
1720 | for (i = 0; i < voltages; i++) { | |
1721 | ret = regulator_list_voltage(regulator, i); | |
1722 | ||
1723 | if (ret >= min_uV && ret <= max_uV) | |
1724 | return 1; | |
1725 | } | |
1726 | ||
1727 | return 0; | |
1728 | } | |
1729 | ||
75790251 MB |
1730 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
1731 | int min_uV, int max_uV) | |
1732 | { | |
1733 | int ret; | |
77af1b26 | 1734 | int delay = 0; |
75790251 MB |
1735 | unsigned int selector; |
1736 | ||
1737 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
1738 | ||
bf5892a8 MB |
1739 | min_uV += rdev->constraints->uV_offset; |
1740 | max_uV += rdev->constraints->uV_offset; | |
1741 | ||
75790251 MB |
1742 | if (rdev->desc->ops->set_voltage) { |
1743 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
1744 | &selector); | |
1745 | ||
1746 | if (rdev->desc->ops->list_voltage) | |
1747 | selector = rdev->desc->ops->list_voltage(rdev, | |
1748 | selector); | |
1749 | else | |
1750 | selector = -1; | |
e8eef82b MB |
1751 | } else if (rdev->desc->ops->set_voltage_sel) { |
1752 | int best_val = INT_MAX; | |
1753 | int i; | |
1754 | ||
1755 | selector = 0; | |
1756 | ||
1757 | /* Find the smallest voltage that falls within the specified | |
1758 | * range. | |
1759 | */ | |
1760 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1761 | ret = rdev->desc->ops->list_voltage(rdev, i); | |
1762 | if (ret < 0) | |
1763 | continue; | |
1764 | ||
1765 | if (ret < best_val && ret >= min_uV && ret <= max_uV) { | |
1766 | best_val = ret; | |
1767 | selector = i; | |
1768 | } | |
1769 | } | |
1770 | ||
77af1b26 LW |
1771 | /* |
1772 | * If we can't obtain the old selector there is not enough | |
1773 | * info to call set_voltage_time_sel(). | |
1774 | */ | |
1775 | if (rdev->desc->ops->set_voltage_time_sel && | |
1776 | rdev->desc->ops->get_voltage_sel) { | |
1777 | unsigned int old_selector = 0; | |
1778 | ||
1779 | ret = rdev->desc->ops->get_voltage_sel(rdev); | |
1780 | if (ret < 0) | |
1781 | return ret; | |
1782 | old_selector = ret; | |
1783 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, | |
1784 | old_selector, selector); | |
1785 | } | |
1786 | ||
e8eef82b MB |
1787 | if (best_val != INT_MAX) { |
1788 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
1789 | selector = best_val; | |
1790 | } else { | |
1791 | ret = -EINVAL; | |
1792 | } | |
75790251 MB |
1793 | } else { |
1794 | ret = -EINVAL; | |
1795 | } | |
1796 | ||
77af1b26 LW |
1797 | /* Insert any necessary delays */ |
1798 | if (delay >= 1000) { | |
1799 | mdelay(delay / 1000); | |
1800 | udelay(delay % 1000); | |
1801 | } else if (delay) { | |
1802 | udelay(delay); | |
1803 | } | |
1804 | ||
ded06a52 MB |
1805 | if (ret == 0) |
1806 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, | |
1807 | NULL); | |
1808 | ||
75790251 MB |
1809 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); |
1810 | ||
1811 | return ret; | |
1812 | } | |
1813 | ||
414c70cb LG |
1814 | /** |
1815 | * regulator_set_voltage - set regulator output voltage | |
1816 | * @regulator: regulator source | |
1817 | * @min_uV: Minimum required voltage in uV | |
1818 | * @max_uV: Maximum acceptable voltage in uV | |
1819 | * | |
1820 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1821 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1822 | * | |
1823 | * If the regulator is enabled then the voltage will change to the new value | |
1824 | * immediately otherwise if the regulator is disabled the regulator will | |
1825 | * output at the new voltage when enabled. | |
1826 | * | |
1827 | * NOTE: If the regulator is shared between several devices then the lowest | |
1828 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1829 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1830 | * calling this function otherwise this call will fail. |
1831 | */ | |
1832 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1833 | { | |
1834 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 1835 | int ret = 0; |
414c70cb LG |
1836 | |
1837 | mutex_lock(&rdev->mutex); | |
1838 | ||
95a3c23a MB |
1839 | /* If we're setting the same range as last time the change |
1840 | * should be a noop (some cpufreq implementations use the same | |
1841 | * voltage for multiple frequencies, for example). | |
1842 | */ | |
1843 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
1844 | goto out; | |
1845 | ||
414c70cb | 1846 | /* sanity check */ |
e8eef82b MB |
1847 | if (!rdev->desc->ops->set_voltage && |
1848 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
1849 | ret = -EINVAL; |
1850 | goto out; | |
1851 | } | |
1852 | ||
1853 | /* constraints check */ | |
1854 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1855 | if (ret < 0) | |
1856 | goto out; | |
1857 | regulator->min_uV = min_uV; | |
1858 | regulator->max_uV = max_uV; | |
3a93f2a9 | 1859 | |
05fda3b1 TP |
1860 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
1861 | if (ret < 0) | |
1862 | goto out; | |
1863 | ||
75790251 | 1864 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
02fa3ec0 | 1865 | |
414c70cb LG |
1866 | out: |
1867 | mutex_unlock(&rdev->mutex); | |
1868 | return ret; | |
1869 | } | |
1870 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1871 | ||
88cd222b LW |
1872 | /** |
1873 | * regulator_set_voltage_time - get raise/fall time | |
1874 | * @regulator: regulator source | |
1875 | * @old_uV: starting voltage in microvolts | |
1876 | * @new_uV: target voltage in microvolts | |
1877 | * | |
1878 | * Provided with the starting and ending voltage, this function attempts to | |
1879 | * calculate the time in microseconds required to rise or fall to this new | |
1880 | * voltage. | |
1881 | */ | |
1882 | int regulator_set_voltage_time(struct regulator *regulator, | |
1883 | int old_uV, int new_uV) | |
1884 | { | |
1885 | struct regulator_dev *rdev = regulator->rdev; | |
1886 | struct regulator_ops *ops = rdev->desc->ops; | |
1887 | int old_sel = -1; | |
1888 | int new_sel = -1; | |
1889 | int voltage; | |
1890 | int i; | |
1891 | ||
1892 | /* Currently requires operations to do this */ | |
1893 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
1894 | || !rdev->desc->n_voltages) | |
1895 | return -EINVAL; | |
1896 | ||
1897 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
1898 | /* We only look for exact voltage matches here */ | |
1899 | voltage = regulator_list_voltage(regulator, i); | |
1900 | if (voltage < 0) | |
1901 | return -EINVAL; | |
1902 | if (voltage == 0) | |
1903 | continue; | |
1904 | if (voltage == old_uV) | |
1905 | old_sel = i; | |
1906 | if (voltage == new_uV) | |
1907 | new_sel = i; | |
1908 | } | |
1909 | ||
1910 | if (old_sel < 0 || new_sel < 0) | |
1911 | return -EINVAL; | |
1912 | ||
1913 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
1914 | } | |
1915 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
1916 | ||
606a2562 MB |
1917 | /** |
1918 | * regulator_sync_voltage - re-apply last regulator output voltage | |
1919 | * @regulator: regulator source | |
1920 | * | |
1921 | * Re-apply the last configured voltage. This is intended to be used | |
1922 | * where some external control source the consumer is cooperating with | |
1923 | * has caused the configured voltage to change. | |
1924 | */ | |
1925 | int regulator_sync_voltage(struct regulator *regulator) | |
1926 | { | |
1927 | struct regulator_dev *rdev = regulator->rdev; | |
1928 | int ret, min_uV, max_uV; | |
1929 | ||
1930 | mutex_lock(&rdev->mutex); | |
1931 | ||
1932 | if (!rdev->desc->ops->set_voltage && | |
1933 | !rdev->desc->ops->set_voltage_sel) { | |
1934 | ret = -EINVAL; | |
1935 | goto out; | |
1936 | } | |
1937 | ||
1938 | /* This is only going to work if we've had a voltage configured. */ | |
1939 | if (!regulator->min_uV && !regulator->max_uV) { | |
1940 | ret = -EINVAL; | |
1941 | goto out; | |
1942 | } | |
1943 | ||
1944 | min_uV = regulator->min_uV; | |
1945 | max_uV = regulator->max_uV; | |
1946 | ||
1947 | /* This should be a paranoia check... */ | |
1948 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1949 | if (ret < 0) | |
1950 | goto out; | |
1951 | ||
1952 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
1953 | if (ret < 0) | |
1954 | goto out; | |
1955 | ||
1956 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
1957 | ||
1958 | out: | |
1959 | mutex_unlock(&rdev->mutex); | |
1960 | return ret; | |
1961 | } | |
1962 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
1963 | ||
414c70cb LG |
1964 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
1965 | { | |
bf5892a8 | 1966 | int sel, ret; |
476c2d83 MB |
1967 | |
1968 | if (rdev->desc->ops->get_voltage_sel) { | |
1969 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
1970 | if (sel < 0) | |
1971 | return sel; | |
bf5892a8 | 1972 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 1973 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 1974 | ret = rdev->desc->ops->get_voltage(rdev); |
cb220d16 | 1975 | } else { |
414c70cb | 1976 | return -EINVAL; |
cb220d16 | 1977 | } |
bf5892a8 | 1978 | |
cb220d16 AL |
1979 | if (ret < 0) |
1980 | return ret; | |
bf5892a8 | 1981 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
1982 | } |
1983 | ||
1984 | /** | |
1985 | * regulator_get_voltage - get regulator output voltage | |
1986 | * @regulator: regulator source | |
1987 | * | |
1988 | * This returns the current regulator voltage in uV. | |
1989 | * | |
1990 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1991 | * function should not be used to determine regulator state. | |
1992 | */ | |
1993 | int regulator_get_voltage(struct regulator *regulator) | |
1994 | { | |
1995 | int ret; | |
1996 | ||
1997 | mutex_lock(®ulator->rdev->mutex); | |
1998 | ||
1999 | ret = _regulator_get_voltage(regulator->rdev); | |
2000 | ||
2001 | mutex_unlock(®ulator->rdev->mutex); | |
2002 | ||
2003 | return ret; | |
2004 | } | |
2005 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2006 | ||
2007 | /** | |
2008 | * regulator_set_current_limit - set regulator output current limit | |
2009 | * @regulator: regulator source | |
2010 | * @min_uA: Minimuum supported current in uA | |
2011 | * @max_uA: Maximum supported current in uA | |
2012 | * | |
2013 | * Sets current sink to the desired output current. This can be set during | |
2014 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2015 | * | |
2016 | * If the regulator is enabled then the current will change to the new value | |
2017 | * immediately otherwise if the regulator is disabled the regulator will | |
2018 | * output at the new current when enabled. | |
2019 | * | |
2020 | * NOTE: Regulator system constraints must be set for this regulator before | |
2021 | * calling this function otherwise this call will fail. | |
2022 | */ | |
2023 | int regulator_set_current_limit(struct regulator *regulator, | |
2024 | int min_uA, int max_uA) | |
2025 | { | |
2026 | struct regulator_dev *rdev = regulator->rdev; | |
2027 | int ret; | |
2028 | ||
2029 | mutex_lock(&rdev->mutex); | |
2030 | ||
2031 | /* sanity check */ | |
2032 | if (!rdev->desc->ops->set_current_limit) { | |
2033 | ret = -EINVAL; | |
2034 | goto out; | |
2035 | } | |
2036 | ||
2037 | /* constraints check */ | |
2038 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2039 | if (ret < 0) | |
2040 | goto out; | |
2041 | ||
2042 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2043 | out: | |
2044 | mutex_unlock(&rdev->mutex); | |
2045 | return ret; | |
2046 | } | |
2047 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2048 | ||
2049 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2050 | { | |
2051 | int ret; | |
2052 | ||
2053 | mutex_lock(&rdev->mutex); | |
2054 | ||
2055 | /* sanity check */ | |
2056 | if (!rdev->desc->ops->get_current_limit) { | |
2057 | ret = -EINVAL; | |
2058 | goto out; | |
2059 | } | |
2060 | ||
2061 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2062 | out: | |
2063 | mutex_unlock(&rdev->mutex); | |
2064 | return ret; | |
2065 | } | |
2066 | ||
2067 | /** | |
2068 | * regulator_get_current_limit - get regulator output current | |
2069 | * @regulator: regulator source | |
2070 | * | |
2071 | * This returns the current supplied by the specified current sink in uA. | |
2072 | * | |
2073 | * NOTE: If the regulator is disabled it will return the current value. This | |
2074 | * function should not be used to determine regulator state. | |
2075 | */ | |
2076 | int regulator_get_current_limit(struct regulator *regulator) | |
2077 | { | |
2078 | return _regulator_get_current_limit(regulator->rdev); | |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2081 | ||
2082 | /** | |
2083 | * regulator_set_mode - set regulator operating mode | |
2084 | * @regulator: regulator source | |
2085 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2086 | * | |
2087 | * Set regulator operating mode to increase regulator efficiency or improve | |
2088 | * regulation performance. | |
2089 | * | |
2090 | * NOTE: Regulator system constraints must be set for this regulator before | |
2091 | * calling this function otherwise this call will fail. | |
2092 | */ | |
2093 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2094 | { | |
2095 | struct regulator_dev *rdev = regulator->rdev; | |
2096 | int ret; | |
500b4ac9 | 2097 | int regulator_curr_mode; |
414c70cb LG |
2098 | |
2099 | mutex_lock(&rdev->mutex); | |
2100 | ||
2101 | /* sanity check */ | |
2102 | if (!rdev->desc->ops->set_mode) { | |
2103 | ret = -EINVAL; | |
2104 | goto out; | |
2105 | } | |
2106 | ||
500b4ac9 SI |
2107 | /* return if the same mode is requested */ |
2108 | if (rdev->desc->ops->get_mode) { | |
2109 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2110 | if (regulator_curr_mode == mode) { | |
2111 | ret = 0; | |
2112 | goto out; | |
2113 | } | |
2114 | } | |
2115 | ||
414c70cb | 2116 | /* constraints check */ |
22c51b47 | 2117 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2118 | if (ret < 0) |
2119 | goto out; | |
2120 | ||
2121 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2122 | out: | |
2123 | mutex_unlock(&rdev->mutex); | |
2124 | return ret; | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2127 | ||
2128 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2129 | { | |
2130 | int ret; | |
2131 | ||
2132 | mutex_lock(&rdev->mutex); | |
2133 | ||
2134 | /* sanity check */ | |
2135 | if (!rdev->desc->ops->get_mode) { | |
2136 | ret = -EINVAL; | |
2137 | goto out; | |
2138 | } | |
2139 | ||
2140 | ret = rdev->desc->ops->get_mode(rdev); | |
2141 | out: | |
2142 | mutex_unlock(&rdev->mutex); | |
2143 | return ret; | |
2144 | } | |
2145 | ||
2146 | /** | |
2147 | * regulator_get_mode - get regulator operating mode | |
2148 | * @regulator: regulator source | |
2149 | * | |
2150 | * Get the current regulator operating mode. | |
2151 | */ | |
2152 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2153 | { | |
2154 | return _regulator_get_mode(regulator->rdev); | |
2155 | } | |
2156 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2157 | ||
2158 | /** | |
2159 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2160 | * @regulator: regulator source | |
2161 | * @uA_load: load current | |
2162 | * | |
2163 | * Notifies the regulator core of a new device load. This is then used by | |
2164 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2165 | * operating mode for the new regulator loading. | |
2166 | * | |
2167 | * Consumer devices notify their supply regulator of the maximum power | |
2168 | * they will require (can be taken from device datasheet in the power | |
2169 | * consumption tables) when they change operational status and hence power | |
2170 | * state. Examples of operational state changes that can affect power | |
2171 | * consumption are :- | |
2172 | * | |
2173 | * o Device is opened / closed. | |
2174 | * o Device I/O is about to begin or has just finished. | |
2175 | * o Device is idling in between work. | |
2176 | * | |
2177 | * This information is also exported via sysfs to userspace. | |
2178 | * | |
2179 | * DRMS will sum the total requested load on the regulator and change | |
2180 | * to the most efficient operating mode if platform constraints allow. | |
2181 | * | |
2182 | * Returns the new regulator mode or error. | |
2183 | */ | |
2184 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2185 | { | |
2186 | struct regulator_dev *rdev = regulator->rdev; | |
2187 | struct regulator *consumer; | |
2188 | int ret, output_uV, input_uV, total_uA_load = 0; | |
2189 | unsigned int mode; | |
2190 | ||
2191 | mutex_lock(&rdev->mutex); | |
2192 | ||
a4b41483 MB |
2193 | /* |
2194 | * first check to see if we can set modes at all, otherwise just | |
2195 | * tell the consumer everything is OK. | |
2196 | */ | |
414c70cb LG |
2197 | regulator->uA_load = uA_load; |
2198 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2199 | if (ret < 0) { |
2200 | ret = 0; | |
414c70cb | 2201 | goto out; |
a4b41483 | 2202 | } |
414c70cb | 2203 | |
414c70cb LG |
2204 | if (!rdev->desc->ops->get_optimum_mode) |
2205 | goto out; | |
2206 | ||
a4b41483 MB |
2207 | /* |
2208 | * we can actually do this so any errors are indicators of | |
2209 | * potential real failure. | |
2210 | */ | |
2211 | ret = -EINVAL; | |
2212 | ||
414c70cb | 2213 | /* get output voltage */ |
1bf5a1f8 | 2214 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2215 | if (output_uV <= 0) { |
5da84fd9 | 2216 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2217 | goto out; |
2218 | } | |
2219 | ||
2220 | /* get input voltage */ | |
1bf5a1f8 MB |
2221 | input_uV = 0; |
2222 | if (rdev->supply) | |
3801b86a | 2223 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 2224 | if (input_uV <= 0) |
414c70cb LG |
2225 | input_uV = rdev->constraints->input_uV; |
2226 | if (input_uV <= 0) { | |
5da84fd9 | 2227 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2228 | goto out; |
2229 | } | |
2230 | ||
2231 | /* calc total requested load for this regulator */ | |
2232 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2233 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2234 | |
2235 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2236 | input_uV, output_uV, | |
2237 | total_uA_load); | |
2c608234 | 2238 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2239 | if (ret < 0) { |
5da84fd9 JP |
2240 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2241 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2242 | goto out; |
2243 | } | |
2244 | ||
2245 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2246 | if (ret < 0) { |
5da84fd9 | 2247 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2248 | goto out; |
2249 | } | |
2250 | ret = mode; | |
2251 | out: | |
2252 | mutex_unlock(&rdev->mutex); | |
2253 | return ret; | |
2254 | } | |
2255 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2256 | ||
2257 | /** | |
2258 | * regulator_register_notifier - register regulator event notifier | |
2259 | * @regulator: regulator source | |
69279fb9 | 2260 | * @nb: notifier block |
414c70cb LG |
2261 | * |
2262 | * Register notifier block to receive regulator events. | |
2263 | */ | |
2264 | int regulator_register_notifier(struct regulator *regulator, | |
2265 | struct notifier_block *nb) | |
2266 | { | |
2267 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2268 | nb); | |
2269 | } | |
2270 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2271 | ||
2272 | /** | |
2273 | * regulator_unregister_notifier - unregister regulator event notifier | |
2274 | * @regulator: regulator source | |
69279fb9 | 2275 | * @nb: notifier block |
414c70cb LG |
2276 | * |
2277 | * Unregister regulator event notifier block. | |
2278 | */ | |
2279 | int regulator_unregister_notifier(struct regulator *regulator, | |
2280 | struct notifier_block *nb) | |
2281 | { | |
2282 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2283 | nb); | |
2284 | } | |
2285 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2286 | ||
b136fb44 JC |
2287 | /* notify regulator consumers and downstream regulator consumers. |
2288 | * Note mutex must be held by caller. | |
2289 | */ | |
414c70cb LG |
2290 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2291 | unsigned long event, void *data) | |
2292 | { | |
414c70cb | 2293 | /* call rdev chain first */ |
414c70cb | 2294 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
2295 | } |
2296 | ||
2297 | /** | |
2298 | * regulator_bulk_get - get multiple regulator consumers | |
2299 | * | |
2300 | * @dev: Device to supply | |
2301 | * @num_consumers: Number of consumers to register | |
2302 | * @consumers: Configuration of consumers; clients are stored here. | |
2303 | * | |
2304 | * @return 0 on success, an errno on failure. | |
2305 | * | |
2306 | * This helper function allows drivers to get several regulator | |
2307 | * consumers in one operation. If any of the regulators cannot be | |
2308 | * acquired then any regulators that were allocated will be freed | |
2309 | * before returning to the caller. | |
2310 | */ | |
2311 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2312 | struct regulator_bulk_data *consumers) | |
2313 | { | |
2314 | int i; | |
2315 | int ret; | |
2316 | ||
2317 | for (i = 0; i < num_consumers; i++) | |
2318 | consumers[i].consumer = NULL; | |
2319 | ||
2320 | for (i = 0; i < num_consumers; i++) { | |
2321 | consumers[i].consumer = regulator_get(dev, | |
2322 | consumers[i].supply); | |
2323 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2324 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2325 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2326 | consumers[i].supply, ret); | |
414c70cb LG |
2327 | consumers[i].consumer = NULL; |
2328 | goto err; | |
2329 | } | |
2330 | } | |
2331 | ||
2332 | return 0; | |
2333 | ||
2334 | err: | |
2335 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2336 | regulator_put(consumers[i].consumer); | |
2337 | ||
2338 | return ret; | |
2339 | } | |
2340 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2341 | ||
f21e0e81 MB |
2342 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2343 | { | |
2344 | struct regulator_bulk_data *bulk = data; | |
2345 | ||
2346 | bulk->ret = regulator_enable(bulk->consumer); | |
2347 | } | |
2348 | ||
414c70cb LG |
2349 | /** |
2350 | * regulator_bulk_enable - enable multiple regulator consumers | |
2351 | * | |
2352 | * @num_consumers: Number of consumers | |
2353 | * @consumers: Consumer data; clients are stored here. | |
2354 | * @return 0 on success, an errno on failure | |
2355 | * | |
2356 | * This convenience API allows consumers to enable multiple regulator | |
2357 | * clients in a single API call. If any consumers cannot be enabled | |
2358 | * then any others that were enabled will be disabled again prior to | |
2359 | * return. | |
2360 | */ | |
2361 | int regulator_bulk_enable(int num_consumers, | |
2362 | struct regulator_bulk_data *consumers) | |
2363 | { | |
f21e0e81 | 2364 | LIST_HEAD(async_domain); |
414c70cb | 2365 | int i; |
f21e0e81 | 2366 | int ret = 0; |
414c70cb | 2367 | |
f21e0e81 MB |
2368 | for (i = 0; i < num_consumers; i++) |
2369 | async_schedule_domain(regulator_bulk_enable_async, | |
2370 | &consumers[i], &async_domain); | |
2371 | ||
2372 | async_synchronize_full_domain(&async_domain); | |
2373 | ||
2374 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2375 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2376 | if (consumers[i].ret != 0) { |
2377 | ret = consumers[i].ret; | |
414c70cb | 2378 | goto err; |
f21e0e81 | 2379 | } |
414c70cb LG |
2380 | } |
2381 | ||
2382 | return 0; | |
2383 | ||
2384 | err: | |
f21e0e81 MB |
2385 | for (i = 0; i < num_consumers; i++) |
2386 | if (consumers[i].ret == 0) | |
2387 | regulator_disable(consumers[i].consumer); | |
2388 | else | |
2389 | pr_err("Failed to enable %s: %d\n", | |
2390 | consumers[i].supply, consumers[i].ret); | |
414c70cb LG |
2391 | |
2392 | return ret; | |
2393 | } | |
2394 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2395 | ||
2396 | /** | |
2397 | * regulator_bulk_disable - disable multiple regulator consumers | |
2398 | * | |
2399 | * @num_consumers: Number of consumers | |
2400 | * @consumers: Consumer data; clients are stored here. | |
2401 | * @return 0 on success, an errno on failure | |
2402 | * | |
2403 | * This convenience API allows consumers to disable multiple regulator | |
2404 | * clients in a single API call. If any consumers cannot be enabled | |
2405 | * then any others that were disabled will be disabled again prior to | |
2406 | * return. | |
2407 | */ | |
2408 | int regulator_bulk_disable(int num_consumers, | |
2409 | struct regulator_bulk_data *consumers) | |
2410 | { | |
2411 | int i; | |
2412 | int ret; | |
2413 | ||
2414 | for (i = 0; i < num_consumers; i++) { | |
2415 | ret = regulator_disable(consumers[i].consumer); | |
2416 | if (ret != 0) | |
2417 | goto err; | |
2418 | } | |
2419 | ||
2420 | return 0; | |
2421 | ||
2422 | err: | |
5da84fd9 | 2423 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2424 | for (--i; i >= 0; --i) |
414c70cb LG |
2425 | regulator_enable(consumers[i].consumer); |
2426 | ||
2427 | return ret; | |
2428 | } | |
2429 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2430 | ||
2431 | /** | |
2432 | * regulator_bulk_free - free multiple regulator consumers | |
2433 | * | |
2434 | * @num_consumers: Number of consumers | |
2435 | * @consumers: Consumer data; clients are stored here. | |
2436 | * | |
2437 | * This convenience API allows consumers to free multiple regulator | |
2438 | * clients in a single API call. | |
2439 | */ | |
2440 | void regulator_bulk_free(int num_consumers, | |
2441 | struct regulator_bulk_data *consumers) | |
2442 | { | |
2443 | int i; | |
2444 | ||
2445 | for (i = 0; i < num_consumers; i++) { | |
2446 | regulator_put(consumers[i].consumer); | |
2447 | consumers[i].consumer = NULL; | |
2448 | } | |
2449 | } | |
2450 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2451 | ||
2452 | /** | |
2453 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2454 | * @rdev: regulator source |
414c70cb | 2455 | * @event: notifier block |
69279fb9 | 2456 | * @data: callback-specific data. |
414c70cb LG |
2457 | * |
2458 | * Called by regulator drivers to notify clients a regulator event has | |
2459 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2460 | * Note lock must be held by caller. |
414c70cb LG |
2461 | */ |
2462 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2463 | unsigned long event, void *data) | |
2464 | { | |
2465 | _notifier_call_chain(rdev, event, data); | |
2466 | return NOTIFY_DONE; | |
2467 | ||
2468 | } | |
2469 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2470 | ||
be721979 MB |
2471 | /** |
2472 | * regulator_mode_to_status - convert a regulator mode into a status | |
2473 | * | |
2474 | * @mode: Mode to convert | |
2475 | * | |
2476 | * Convert a regulator mode into a status. | |
2477 | */ | |
2478 | int regulator_mode_to_status(unsigned int mode) | |
2479 | { | |
2480 | switch (mode) { | |
2481 | case REGULATOR_MODE_FAST: | |
2482 | return REGULATOR_STATUS_FAST; | |
2483 | case REGULATOR_MODE_NORMAL: | |
2484 | return REGULATOR_STATUS_NORMAL; | |
2485 | case REGULATOR_MODE_IDLE: | |
2486 | return REGULATOR_STATUS_IDLE; | |
2487 | case REGULATOR_STATUS_STANDBY: | |
2488 | return REGULATOR_STATUS_STANDBY; | |
2489 | default: | |
2490 | return 0; | |
2491 | } | |
2492 | } | |
2493 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2494 | ||
7ad68e2f DB |
2495 | /* |
2496 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2497 | * create attributes that can be meaningfully displayed. | |
2498 | */ | |
2499 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2500 | { | |
2501 | struct device *dev = &rdev->dev; | |
2502 | struct regulator_ops *ops = rdev->desc->ops; | |
2503 | int status = 0; | |
2504 | ||
2505 | /* some attributes need specific methods to be displayed */ | |
476c2d83 | 2506 | if (ops->get_voltage || ops->get_voltage_sel) { |
7ad68e2f DB |
2507 | status = device_create_file(dev, &dev_attr_microvolts); |
2508 | if (status < 0) | |
2509 | return status; | |
2510 | } | |
2511 | if (ops->get_current_limit) { | |
2512 | status = device_create_file(dev, &dev_attr_microamps); | |
2513 | if (status < 0) | |
2514 | return status; | |
2515 | } | |
2516 | if (ops->get_mode) { | |
2517 | status = device_create_file(dev, &dev_attr_opmode); | |
2518 | if (status < 0) | |
2519 | return status; | |
2520 | } | |
2521 | if (ops->is_enabled) { | |
2522 | status = device_create_file(dev, &dev_attr_state); | |
2523 | if (status < 0) | |
2524 | return status; | |
2525 | } | |
853116a1 DB |
2526 | if (ops->get_status) { |
2527 | status = device_create_file(dev, &dev_attr_status); | |
2528 | if (status < 0) | |
2529 | return status; | |
2530 | } | |
7ad68e2f DB |
2531 | |
2532 | /* some attributes are type-specific */ | |
2533 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2534 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2535 | if (status < 0) | |
2536 | return status; | |
2537 | } | |
2538 | ||
2539 | /* all the other attributes exist to support constraints; | |
2540 | * don't show them if there are no constraints, or if the | |
2541 | * relevant supporting methods are missing. | |
2542 | */ | |
2543 | if (!rdev->constraints) | |
2544 | return status; | |
2545 | ||
2546 | /* constraints need specific supporting methods */ | |
e8eef82b | 2547 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
2548 | status = device_create_file(dev, &dev_attr_min_microvolts); |
2549 | if (status < 0) | |
2550 | return status; | |
2551 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2552 | if (status < 0) | |
2553 | return status; | |
2554 | } | |
2555 | if (ops->set_current_limit) { | |
2556 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2557 | if (status < 0) | |
2558 | return status; | |
2559 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2560 | if (status < 0) | |
2561 | return status; | |
2562 | } | |
2563 | ||
2564 | /* suspend mode constraints need multiple supporting methods */ | |
2565 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2566 | return status; | |
2567 | ||
2568 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2569 | if (status < 0) | |
2570 | return status; | |
2571 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2572 | if (status < 0) | |
2573 | return status; | |
2574 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2575 | if (status < 0) | |
2576 | return status; | |
2577 | ||
2578 | if (ops->set_suspend_voltage) { | |
2579 | status = device_create_file(dev, | |
2580 | &dev_attr_suspend_standby_microvolts); | |
2581 | if (status < 0) | |
2582 | return status; | |
2583 | status = device_create_file(dev, | |
2584 | &dev_attr_suspend_mem_microvolts); | |
2585 | if (status < 0) | |
2586 | return status; | |
2587 | status = device_create_file(dev, | |
2588 | &dev_attr_suspend_disk_microvolts); | |
2589 | if (status < 0) | |
2590 | return status; | |
2591 | } | |
2592 | ||
2593 | if (ops->set_suspend_mode) { | |
2594 | status = device_create_file(dev, | |
2595 | &dev_attr_suspend_standby_mode); | |
2596 | if (status < 0) | |
2597 | return status; | |
2598 | status = device_create_file(dev, | |
2599 | &dev_attr_suspend_mem_mode); | |
2600 | if (status < 0) | |
2601 | return status; | |
2602 | status = device_create_file(dev, | |
2603 | &dev_attr_suspend_disk_mode); | |
2604 | if (status < 0) | |
2605 | return status; | |
2606 | } | |
2607 | ||
2608 | return status; | |
2609 | } | |
2610 | ||
1130e5b3 MB |
2611 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
2612 | { | |
2613 | #ifdef CONFIG_DEBUG_FS | |
2614 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); | |
2615 | if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { | |
2616 | rdev_warn(rdev, "Failed to create debugfs directory\n"); | |
2617 | rdev->debugfs = NULL; | |
2618 | return; | |
2619 | } | |
2620 | ||
2621 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
2622 | &rdev->use_count); | |
2623 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
2624 | &rdev->open_count); | |
2625 | #endif | |
2626 | } | |
2627 | ||
414c70cb LG |
2628 | /** |
2629 | * regulator_register - register regulator | |
69279fb9 MB |
2630 | * @regulator_desc: regulator to register |
2631 | * @dev: struct device for the regulator | |
0527100f | 2632 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2633 | * @driver_data: private regulator data |
414c70cb LG |
2634 | * |
2635 | * Called by regulator drivers to register a regulator. | |
2636 | * Returns 0 on success. | |
2637 | */ | |
2638 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
f8c12fe3 | 2639 | struct device *dev, const struct regulator_init_data *init_data, |
0527100f | 2640 | void *driver_data) |
414c70cb LG |
2641 | { |
2642 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2643 | struct regulator_dev *rdev; | |
a5766f11 | 2644 | int ret, i; |
414c70cb LG |
2645 | |
2646 | if (regulator_desc == NULL) | |
2647 | return ERR_PTR(-EINVAL); | |
2648 | ||
2649 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2650 | return ERR_PTR(-EINVAL); | |
2651 | ||
cd78dfc6 DL |
2652 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2653 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2654 | return ERR_PTR(-EINVAL); |
2655 | ||
46fabe1e MB |
2656 | if (!init_data) |
2657 | return ERR_PTR(-EINVAL); | |
2658 | ||
476c2d83 MB |
2659 | /* Only one of each should be implemented */ |
2660 | WARN_ON(regulator_desc->ops->get_voltage && | |
2661 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
2662 | WARN_ON(regulator_desc->ops->set_voltage && |
2663 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
2664 | |
2665 | /* If we're using selectors we must implement list_voltage. */ | |
2666 | if (regulator_desc->ops->get_voltage_sel && | |
2667 | !regulator_desc->ops->list_voltage) { | |
2668 | return ERR_PTR(-EINVAL); | |
2669 | } | |
e8eef82b MB |
2670 | if (regulator_desc->ops->set_voltage_sel && |
2671 | !regulator_desc->ops->list_voltage) { | |
2672 | return ERR_PTR(-EINVAL); | |
2673 | } | |
476c2d83 | 2674 | |
414c70cb LG |
2675 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2676 | if (rdev == NULL) | |
2677 | return ERR_PTR(-ENOMEM); | |
2678 | ||
2679 | mutex_lock(®ulator_list_mutex); | |
2680 | ||
2681 | mutex_init(&rdev->mutex); | |
a5766f11 | 2682 | rdev->reg_data = driver_data; |
414c70cb LG |
2683 | rdev->owner = regulator_desc->owner; |
2684 | rdev->desc = regulator_desc; | |
2685 | INIT_LIST_HEAD(&rdev->consumer_list); | |
414c70cb | 2686 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 2687 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 2688 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 2689 | |
a5766f11 LG |
2690 | /* preform any regulator specific init */ |
2691 | if (init_data->regulator_init) { | |
2692 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2693 | if (ret < 0) |
2694 | goto clean; | |
a5766f11 LG |
2695 | } |
2696 | ||
a5766f11 | 2697 | /* register with sysfs */ |
414c70cb | 2698 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2699 | rdev->dev.parent = dev; |
812460a9 KS |
2700 | dev_set_name(&rdev->dev, "regulator.%d", |
2701 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2702 | ret = device_register(&rdev->dev); |
ad7725cb VK |
2703 | if (ret != 0) { |
2704 | put_device(&rdev->dev); | |
4fca9545 | 2705 | goto clean; |
ad7725cb | 2706 | } |
a5766f11 LG |
2707 | |
2708 | dev_set_drvdata(&rdev->dev, rdev); | |
2709 | ||
74f544c1 MR |
2710 | /* set regulator constraints */ |
2711 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2712 | if (ret < 0) | |
2713 | goto scrub; | |
2714 | ||
7ad68e2f DB |
2715 | /* add attributes supported by this regulator */ |
2716 | ret = add_regulator_attributes(rdev); | |
2717 | if (ret < 0) | |
2718 | goto scrub; | |
2719 | ||
0178f3e2 MB |
2720 | if (init_data->supply_regulator) { |
2721 | struct regulator_dev *r; | |
2722 | int found = 0; | |
2723 | ||
2724 | list_for_each_entry(r, ®ulator_list, list) { | |
2725 | if (strcmp(rdev_get_name(r), | |
2726 | init_data->supply_regulator) == 0) { | |
2727 | found = 1; | |
2728 | break; | |
2729 | } | |
2730 | } | |
2731 | ||
2732 | if (!found) { | |
2733 | dev_err(dev, "Failed to find supply %s\n", | |
2734 | init_data->supply_regulator); | |
7727da22 | 2735 | ret = -ENODEV; |
0178f3e2 MB |
2736 | goto scrub; |
2737 | } | |
2738 | ||
2739 | ret = set_supply(rdev, r); | |
2740 | if (ret < 0) | |
2741 | goto scrub; | |
2742 | } | |
2743 | ||
a5766f11 LG |
2744 | /* add consumers devices */ |
2745 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2746 | ret = set_consumer_device_supply(rdev, | |
2747 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2748 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2749 | init_data->consumer_supplies[i].supply); |
23c2f041 MB |
2750 | if (ret < 0) { |
2751 | dev_err(dev, "Failed to set supply %s\n", | |
2752 | init_data->consumer_supplies[i].supply); | |
d4033b54 | 2753 | goto unset_supplies; |
23c2f041 | 2754 | } |
414c70cb | 2755 | } |
a5766f11 LG |
2756 | |
2757 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
2758 | |
2759 | rdev_init_debugfs(rdev); | |
a5766f11 | 2760 | out: |
414c70cb LG |
2761 | mutex_unlock(®ulator_list_mutex); |
2762 | return rdev; | |
4fca9545 | 2763 | |
d4033b54 JN |
2764 | unset_supplies: |
2765 | unset_regulator_supplies(rdev); | |
2766 | ||
4fca9545 | 2767 | scrub: |
1a6958e7 | 2768 | kfree(rdev->constraints); |
4fca9545 | 2769 | device_unregister(&rdev->dev); |
53032daf PW |
2770 | /* device core frees rdev */ |
2771 | rdev = ERR_PTR(ret); | |
2772 | goto out; | |
2773 | ||
4fca9545 DB |
2774 | clean: |
2775 | kfree(rdev); | |
2776 | rdev = ERR_PTR(ret); | |
2777 | goto out; | |
414c70cb LG |
2778 | } |
2779 | EXPORT_SYMBOL_GPL(regulator_register); | |
2780 | ||
2781 | /** | |
2782 | * regulator_unregister - unregister regulator | |
69279fb9 | 2783 | * @rdev: regulator to unregister |
414c70cb LG |
2784 | * |
2785 | * Called by regulator drivers to unregister a regulator. | |
2786 | */ | |
2787 | void regulator_unregister(struct regulator_dev *rdev) | |
2788 | { | |
2789 | if (rdev == NULL) | |
2790 | return; | |
2791 | ||
2792 | mutex_lock(®ulator_list_mutex); | |
1130e5b3 MB |
2793 | #ifdef CONFIG_DEBUG_FS |
2794 | debugfs_remove_recursive(rdev->debugfs); | |
2795 | #endif | |
da07ecd9 | 2796 | flush_work_sync(&rdev->disable_work.work); |
6bf87d17 | 2797 | WARN_ON(rdev->open_count); |
0f1d747b | 2798 | unset_regulator_supplies(rdev); |
414c70cb LG |
2799 | list_del(&rdev->list); |
2800 | if (rdev->supply) | |
3801b86a | 2801 | regulator_put(rdev->supply); |
414c70cb | 2802 | device_unregister(&rdev->dev); |
f8c12fe3 | 2803 | kfree(rdev->constraints); |
414c70cb LG |
2804 | mutex_unlock(®ulator_list_mutex); |
2805 | } | |
2806 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2807 | ||
414c70cb | 2808 | /** |
cf7bbcdf | 2809 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2810 | * @state: system suspend state |
2811 | * | |
2812 | * Configure each regulator with it's suspend operating parameters for state. | |
2813 | * This will usually be called by machine suspend code prior to supending. | |
2814 | */ | |
2815 | int regulator_suspend_prepare(suspend_state_t state) | |
2816 | { | |
2817 | struct regulator_dev *rdev; | |
2818 | int ret = 0; | |
2819 | ||
2820 | /* ON is handled by regulator active state */ | |
2821 | if (state == PM_SUSPEND_ON) | |
2822 | return -EINVAL; | |
2823 | ||
2824 | mutex_lock(®ulator_list_mutex); | |
2825 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2826 | ||
2827 | mutex_lock(&rdev->mutex); | |
2828 | ret = suspend_prepare(rdev, state); | |
2829 | mutex_unlock(&rdev->mutex); | |
2830 | ||
2831 | if (ret < 0) { | |
5da84fd9 | 2832 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
2833 | goto out; |
2834 | } | |
2835 | } | |
2836 | out: | |
2837 | mutex_unlock(®ulator_list_mutex); | |
2838 | return ret; | |
2839 | } | |
2840 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2841 | ||
7a32b589 MH |
2842 | /** |
2843 | * regulator_suspend_finish - resume regulators from system wide suspend | |
2844 | * | |
2845 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
2846 | * and that should be turned on according to the regulators properties. | |
2847 | */ | |
2848 | int regulator_suspend_finish(void) | |
2849 | { | |
2850 | struct regulator_dev *rdev; | |
2851 | int ret = 0, error; | |
2852 | ||
2853 | mutex_lock(®ulator_list_mutex); | |
2854 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2855 | struct regulator_ops *ops = rdev->desc->ops; | |
2856 | ||
2857 | mutex_lock(&rdev->mutex); | |
2858 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
2859 | ops->enable) { | |
2860 | error = ops->enable(rdev); | |
2861 | if (error) | |
2862 | ret = error; | |
2863 | } else { | |
2864 | if (!has_full_constraints) | |
2865 | goto unlock; | |
2866 | if (!ops->disable) | |
2867 | goto unlock; | |
2868 | if (ops->is_enabled && !ops->is_enabled(rdev)) | |
2869 | goto unlock; | |
2870 | ||
2871 | error = ops->disable(rdev); | |
2872 | if (error) | |
2873 | ret = error; | |
2874 | } | |
2875 | unlock: | |
2876 | mutex_unlock(&rdev->mutex); | |
2877 | } | |
2878 | mutex_unlock(®ulator_list_mutex); | |
2879 | return ret; | |
2880 | } | |
2881 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
2882 | ||
ca725561 MB |
2883 | /** |
2884 | * regulator_has_full_constraints - the system has fully specified constraints | |
2885 | * | |
2886 | * Calling this function will cause the regulator API to disable all | |
2887 | * regulators which have a zero use count and don't have an always_on | |
2888 | * constraint in a late_initcall. | |
2889 | * | |
2890 | * The intention is that this will become the default behaviour in a | |
2891 | * future kernel release so users are encouraged to use this facility | |
2892 | * now. | |
2893 | */ | |
2894 | void regulator_has_full_constraints(void) | |
2895 | { | |
2896 | has_full_constraints = 1; | |
2897 | } | |
2898 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2899 | ||
688fe99a MB |
2900 | /** |
2901 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
2902 | * | |
2903 | * Calling this function will cause the regulator API to provide a | |
2904 | * dummy regulator to consumers if no physical regulator is found, | |
2905 | * allowing most consumers to proceed as though a regulator were | |
2906 | * configured. This allows systems such as those with software | |
2907 | * controllable regulators for the CPU core only to be brought up more | |
2908 | * readily. | |
2909 | */ | |
2910 | void regulator_use_dummy_regulator(void) | |
2911 | { | |
2912 | board_wants_dummy_regulator = true; | |
2913 | } | |
2914 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
2915 | ||
414c70cb LG |
2916 | /** |
2917 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2918 | * @rdev: regulator |
414c70cb LG |
2919 | * |
2920 | * Get rdev regulator driver private data. This call can be used in the | |
2921 | * regulator driver context. | |
2922 | */ | |
2923 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2924 | { | |
2925 | return rdev->reg_data; | |
2926 | } | |
2927 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2928 | ||
2929 | /** | |
2930 | * regulator_get_drvdata - get regulator driver data | |
2931 | * @regulator: regulator | |
2932 | * | |
2933 | * Get regulator driver private data. This call can be used in the consumer | |
2934 | * driver context when non API regulator specific functions need to be called. | |
2935 | */ | |
2936 | void *regulator_get_drvdata(struct regulator *regulator) | |
2937 | { | |
2938 | return regulator->rdev->reg_data; | |
2939 | } | |
2940 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2941 | ||
2942 | /** | |
2943 | * regulator_set_drvdata - set regulator driver data | |
2944 | * @regulator: regulator | |
2945 | * @data: data | |
2946 | */ | |
2947 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2948 | { | |
2949 | regulator->rdev->reg_data = data; | |
2950 | } | |
2951 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2952 | ||
2953 | /** | |
2954 | * regulator_get_id - get regulator ID | |
69279fb9 | 2955 | * @rdev: regulator |
414c70cb LG |
2956 | */ |
2957 | int rdev_get_id(struct regulator_dev *rdev) | |
2958 | { | |
2959 | return rdev->desc->id; | |
2960 | } | |
2961 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2962 | ||
a5766f11 LG |
2963 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2964 | { | |
2965 | return &rdev->dev; | |
2966 | } | |
2967 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2968 | ||
2969 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2970 | { | |
2971 | return reg_init_data->driver_data; | |
2972 | } | |
2973 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2974 | ||
ba55a974 MB |
2975 | #ifdef CONFIG_DEBUG_FS |
2976 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
2977 | size_t count, loff_t *ppos) | |
2978 | { | |
2979 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
2980 | ssize_t len, ret = 0; | |
2981 | struct regulator_map *map; | |
2982 | ||
2983 | if (!buf) | |
2984 | return -ENOMEM; | |
2985 | ||
2986 | list_for_each_entry(map, ®ulator_map_list, list) { | |
2987 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
2988 | "%s -> %s.%s\n", | |
2989 | rdev_get_name(map->regulator), map->dev_name, | |
2990 | map->supply); | |
2991 | if (len >= 0) | |
2992 | ret += len; | |
2993 | if (ret > PAGE_SIZE) { | |
2994 | ret = PAGE_SIZE; | |
2995 | break; | |
2996 | } | |
2997 | } | |
2998 | ||
2999 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3000 | ||
3001 | kfree(buf); | |
3002 | ||
3003 | return ret; | |
3004 | } | |
3005 | ||
3006 | static const struct file_operations supply_map_fops = { | |
3007 | .read = supply_map_read_file, | |
3008 | .llseek = default_llseek, | |
3009 | }; | |
3010 | #endif | |
3011 | ||
414c70cb LG |
3012 | static int __init regulator_init(void) |
3013 | { | |
34abbd68 MB |
3014 | int ret; |
3015 | ||
34abbd68 MB |
3016 | ret = class_register(®ulator_class); |
3017 | ||
1130e5b3 MB |
3018 | #ifdef CONFIG_DEBUG_FS |
3019 | debugfs_root = debugfs_create_dir("regulator", NULL); | |
3020 | if (IS_ERR(debugfs_root) || !debugfs_root) { | |
3021 | pr_warn("regulator: Failed to create debugfs directory\n"); | |
3022 | debugfs_root = NULL; | |
3023 | } | |
ba55a974 MB |
3024 | |
3025 | if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, | |
3026 | NULL, &supply_map_fops))) | |
3027 | pr_warn("regulator: Failed to create supplies debugfs\n"); | |
1130e5b3 MB |
3028 | #endif |
3029 | ||
34abbd68 MB |
3030 | regulator_dummy_init(); |
3031 | ||
3032 | return ret; | |
414c70cb LG |
3033 | } |
3034 | ||
3035 | /* init early to allow our consumers to complete system booting */ | |
3036 | core_initcall(regulator_init); | |
ca725561 MB |
3037 | |
3038 | static int __init regulator_init_complete(void) | |
3039 | { | |
3040 | struct regulator_dev *rdev; | |
3041 | struct regulator_ops *ops; | |
3042 | struct regulation_constraints *c; | |
3043 | int enabled, ret; | |
ca725561 MB |
3044 | |
3045 | mutex_lock(®ulator_list_mutex); | |
3046 | ||
3047 | /* If we have a full configuration then disable any regulators | |
3048 | * which are not in use or always_on. This will become the | |
3049 | * default behaviour in the future. | |
3050 | */ | |
3051 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3052 | ops = rdev->desc->ops; | |
3053 | c = rdev->constraints; | |
3054 | ||
f25e0b4f | 3055 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3056 | continue; |
3057 | ||
3058 | mutex_lock(&rdev->mutex); | |
3059 | ||
3060 | if (rdev->use_count) | |
3061 | goto unlock; | |
3062 | ||
3063 | /* If we can't read the status assume it's on. */ | |
3064 | if (ops->is_enabled) | |
3065 | enabled = ops->is_enabled(rdev); | |
3066 | else | |
3067 | enabled = 1; | |
3068 | ||
3069 | if (!enabled) | |
3070 | goto unlock; | |
3071 | ||
3072 | if (has_full_constraints) { | |
3073 | /* We log since this may kill the system if it | |
3074 | * goes wrong. */ | |
5da84fd9 | 3075 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3076 | ret = ops->disable(rdev); |
3077 | if (ret != 0) { | |
5da84fd9 | 3078 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3079 | } |
3080 | } else { | |
3081 | /* The intention is that in future we will | |
3082 | * assume that full constraints are provided | |
3083 | * so warn even if we aren't going to do | |
3084 | * anything here. | |
3085 | */ | |
5da84fd9 | 3086 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3087 | } |
3088 | ||
3089 | unlock: | |
3090 | mutex_unlock(&rdev->mutex); | |
3091 | } | |
3092 | ||
3093 | mutex_unlock(®ulator_list_mutex); | |
3094 | ||
3095 | return 0; | |
3096 | } | |
3097 | late_initcall(regulator_init_complete); |