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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 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/suspend.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/regulator/driver.h> | |
24 | #include <linux/regulator/machine.h> | |
25 | ||
26 | #define REGULATOR_VERSION "0.5" | |
27 | ||
28 | static DEFINE_MUTEX(regulator_list_mutex); | |
29 | static LIST_HEAD(regulator_list); | |
30 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 31 | static int has_full_constraints; |
414c70cb | 32 | |
8dc5390d | 33 | /* |
414c70cb LG |
34 | * struct regulator_map |
35 | * | |
36 | * Used to provide symbolic supply names to devices. | |
37 | */ | |
38 | struct regulator_map { | |
39 | struct list_head list; | |
40 | struct device *dev; | |
41 | const char *supply; | |
a5766f11 | 42 | struct regulator_dev *regulator; |
414c70cb LG |
43 | }; |
44 | ||
414c70cb LG |
45 | /* |
46 | * struct regulator | |
47 | * | |
48 | * One for each consumer device. | |
49 | */ | |
50 | struct regulator { | |
51 | struct device *dev; | |
52 | struct list_head list; | |
53 | int uA_load; | |
54 | int min_uV; | |
55 | int max_uV; | |
414c70cb LG |
56 | char *supply_name; |
57 | struct device_attribute dev_attr; | |
58 | struct regulator_dev *rdev; | |
59 | }; | |
60 | ||
61 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
62 | static int _regulator_disable(struct regulator_dev *rdev); | |
63 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
64 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
65 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
66 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
67 | unsigned long event, void *data); | |
68 | ||
69 | /* gets the regulator for a given consumer device */ | |
70 | static struct regulator *get_device_regulator(struct device *dev) | |
71 | { | |
72 | struct regulator *regulator = NULL; | |
73 | struct regulator_dev *rdev; | |
74 | ||
75 | mutex_lock(®ulator_list_mutex); | |
76 | list_for_each_entry(rdev, ®ulator_list, list) { | |
77 | mutex_lock(&rdev->mutex); | |
78 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
79 | if (regulator->dev == dev) { | |
80 | mutex_unlock(&rdev->mutex); | |
81 | mutex_unlock(®ulator_list_mutex); | |
82 | return regulator; | |
83 | } | |
84 | } | |
85 | mutex_unlock(&rdev->mutex); | |
86 | } | |
87 | mutex_unlock(®ulator_list_mutex); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | /* Platform voltage constraint check */ | |
92 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
93 | int *min_uV, int *max_uV) | |
94 | { | |
95 | BUG_ON(*min_uV > *max_uV); | |
96 | ||
97 | if (!rdev->constraints) { | |
98 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
99 | rdev->desc->name); | |
100 | return -ENODEV; | |
101 | } | |
102 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
103 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
104 | __func__, rdev->desc->name); | |
105 | return -EPERM; | |
106 | } | |
107 | ||
108 | if (*max_uV > rdev->constraints->max_uV) | |
109 | *max_uV = rdev->constraints->max_uV; | |
110 | if (*min_uV < rdev->constraints->min_uV) | |
111 | *min_uV = rdev->constraints->min_uV; | |
112 | ||
113 | if (*min_uV > *max_uV) | |
114 | return -EINVAL; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | /* current constraint check */ | |
120 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
121 | int *min_uA, int *max_uA) | |
122 | { | |
123 | BUG_ON(*min_uA > *max_uA); | |
124 | ||
125 | if (!rdev->constraints) { | |
126 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
127 | rdev->desc->name); | |
128 | return -ENODEV; | |
129 | } | |
130 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
131 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
132 | __func__, rdev->desc->name); | |
133 | return -EPERM; | |
134 | } | |
135 | ||
136 | if (*max_uA > rdev->constraints->max_uA) | |
137 | *max_uA = rdev->constraints->max_uA; | |
138 | if (*min_uA < rdev->constraints->min_uA) | |
139 | *min_uA = rdev->constraints->min_uA; | |
140 | ||
141 | if (*min_uA > *max_uA) | |
142 | return -EINVAL; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | /* operating mode constraint check */ | |
148 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
149 | { | |
e573520b DB |
150 | switch (mode) { |
151 | case REGULATOR_MODE_FAST: | |
152 | case REGULATOR_MODE_NORMAL: | |
153 | case REGULATOR_MODE_IDLE: | |
154 | case REGULATOR_MODE_STANDBY: | |
155 | break; | |
156 | default: | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
414c70cb LG |
160 | if (!rdev->constraints) { |
161 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
162 | rdev->desc->name); | |
163 | return -ENODEV; | |
164 | } | |
165 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
166 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
167 | __func__, rdev->desc->name); | |
168 | return -EPERM; | |
169 | } | |
170 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
171 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
172 | __func__, mode, rdev->desc->name); | |
173 | return -EINVAL; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
178 | /* dynamic regulator mode switching constraint check */ | |
179 | static int regulator_check_drms(struct regulator_dev *rdev) | |
180 | { | |
181 | if (!rdev->constraints) { | |
182 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
183 | rdev->desc->name); | |
184 | return -ENODEV; | |
185 | } | |
186 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
187 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
188 | __func__, rdev->desc->name); | |
189 | return -EPERM; | |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static ssize_t device_requested_uA_show(struct device *dev, | |
195 | struct device_attribute *attr, char *buf) | |
196 | { | |
197 | struct regulator *regulator; | |
198 | ||
199 | regulator = get_device_regulator(dev); | |
200 | if (regulator == NULL) | |
201 | return 0; | |
202 | ||
203 | return sprintf(buf, "%d\n", regulator->uA_load); | |
204 | } | |
205 | ||
206 | static ssize_t regulator_uV_show(struct device *dev, | |
207 | struct device_attribute *attr, char *buf) | |
208 | { | |
a5766f11 | 209 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
210 | ssize_t ret; |
211 | ||
212 | mutex_lock(&rdev->mutex); | |
213 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
214 | mutex_unlock(&rdev->mutex); | |
215 | ||
216 | return ret; | |
217 | } | |
7ad68e2f | 218 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
219 | |
220 | static ssize_t regulator_uA_show(struct device *dev, | |
221 | struct device_attribute *attr, char *buf) | |
222 | { | |
a5766f11 | 223 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
224 | |
225 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
226 | } | |
7ad68e2f | 227 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 228 | |
bc558a60 MB |
229 | static ssize_t regulator_name_show(struct device *dev, |
230 | struct device_attribute *attr, char *buf) | |
231 | { | |
232 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
233 | const char *name; | |
234 | ||
235 | if (rdev->constraints->name) | |
236 | name = rdev->constraints->name; | |
237 | else if (rdev->desc->name) | |
238 | name = rdev->desc->name; | |
239 | else | |
240 | name = ""; | |
241 | ||
242 | return sprintf(buf, "%s\n", name); | |
243 | } | |
244 | ||
4fca9545 | 245 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 246 | { |
414c70cb LG |
247 | switch (mode) { |
248 | case REGULATOR_MODE_FAST: | |
249 | return sprintf(buf, "fast\n"); | |
250 | case REGULATOR_MODE_NORMAL: | |
251 | return sprintf(buf, "normal\n"); | |
252 | case REGULATOR_MODE_IDLE: | |
253 | return sprintf(buf, "idle\n"); | |
254 | case REGULATOR_MODE_STANDBY: | |
255 | return sprintf(buf, "standby\n"); | |
256 | } | |
257 | return sprintf(buf, "unknown\n"); | |
258 | } | |
259 | ||
4fca9545 DB |
260 | static ssize_t regulator_opmode_show(struct device *dev, |
261 | struct device_attribute *attr, char *buf) | |
414c70cb | 262 | { |
a5766f11 | 263 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 264 | |
4fca9545 DB |
265 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
266 | } | |
7ad68e2f | 267 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
268 | |
269 | static ssize_t regulator_print_state(char *buf, int state) | |
270 | { | |
414c70cb LG |
271 | if (state > 0) |
272 | return sprintf(buf, "enabled\n"); | |
273 | else if (state == 0) | |
274 | return sprintf(buf, "disabled\n"); | |
275 | else | |
276 | return sprintf(buf, "unknown\n"); | |
277 | } | |
278 | ||
4fca9545 DB |
279 | static ssize_t regulator_state_show(struct device *dev, |
280 | struct device_attribute *attr, char *buf) | |
281 | { | |
282 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
283 | ||
284 | return regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
285 | } | |
7ad68e2f | 286 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 287 | |
853116a1 DB |
288 | static ssize_t regulator_status_show(struct device *dev, |
289 | struct device_attribute *attr, char *buf) | |
290 | { | |
291 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
292 | int status; | |
293 | char *label; | |
294 | ||
295 | status = rdev->desc->ops->get_status(rdev); | |
296 | if (status < 0) | |
297 | return status; | |
298 | ||
299 | switch (status) { | |
300 | case REGULATOR_STATUS_OFF: | |
301 | label = "off"; | |
302 | break; | |
303 | case REGULATOR_STATUS_ON: | |
304 | label = "on"; | |
305 | break; | |
306 | case REGULATOR_STATUS_ERROR: | |
307 | label = "error"; | |
308 | break; | |
309 | case REGULATOR_STATUS_FAST: | |
310 | label = "fast"; | |
311 | break; | |
312 | case REGULATOR_STATUS_NORMAL: | |
313 | label = "normal"; | |
314 | break; | |
315 | case REGULATOR_STATUS_IDLE: | |
316 | label = "idle"; | |
317 | break; | |
318 | case REGULATOR_STATUS_STANDBY: | |
319 | label = "standby"; | |
320 | break; | |
321 | default: | |
322 | return -ERANGE; | |
323 | } | |
324 | ||
325 | return sprintf(buf, "%s\n", label); | |
326 | } | |
327 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
328 | ||
414c70cb LG |
329 | static ssize_t regulator_min_uA_show(struct device *dev, |
330 | struct device_attribute *attr, char *buf) | |
331 | { | |
a5766f11 | 332 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
333 | |
334 | if (!rdev->constraints) | |
335 | return sprintf(buf, "constraint not defined\n"); | |
336 | ||
337 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
338 | } | |
7ad68e2f | 339 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
340 | |
341 | static ssize_t regulator_max_uA_show(struct device *dev, | |
342 | struct device_attribute *attr, char *buf) | |
343 | { | |
a5766f11 | 344 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
345 | |
346 | if (!rdev->constraints) | |
347 | return sprintf(buf, "constraint not defined\n"); | |
348 | ||
349 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
350 | } | |
7ad68e2f | 351 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
352 | |
353 | static ssize_t regulator_min_uV_show(struct device *dev, | |
354 | struct device_attribute *attr, char *buf) | |
355 | { | |
a5766f11 | 356 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
357 | |
358 | if (!rdev->constraints) | |
359 | return sprintf(buf, "constraint not defined\n"); | |
360 | ||
361 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
362 | } | |
7ad68e2f | 363 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
364 | |
365 | static ssize_t regulator_max_uV_show(struct device *dev, | |
366 | struct device_attribute *attr, char *buf) | |
367 | { | |
a5766f11 | 368 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
369 | |
370 | if (!rdev->constraints) | |
371 | return sprintf(buf, "constraint not defined\n"); | |
372 | ||
373 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
374 | } | |
7ad68e2f | 375 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
376 | |
377 | static ssize_t regulator_total_uA_show(struct device *dev, | |
378 | struct device_attribute *attr, char *buf) | |
379 | { | |
a5766f11 | 380 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
381 | struct regulator *regulator; |
382 | int uA = 0; | |
383 | ||
384 | mutex_lock(&rdev->mutex); | |
385 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
386 | uA += regulator->uA_load; | |
387 | mutex_unlock(&rdev->mutex); | |
388 | return sprintf(buf, "%d\n", uA); | |
389 | } | |
7ad68e2f | 390 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
391 | |
392 | static ssize_t regulator_num_users_show(struct device *dev, | |
393 | struct device_attribute *attr, char *buf) | |
394 | { | |
a5766f11 | 395 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
396 | return sprintf(buf, "%d\n", rdev->use_count); |
397 | } | |
398 | ||
399 | static ssize_t regulator_type_show(struct device *dev, | |
400 | struct device_attribute *attr, char *buf) | |
401 | { | |
a5766f11 | 402 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
403 | |
404 | switch (rdev->desc->type) { | |
405 | case REGULATOR_VOLTAGE: | |
406 | return sprintf(buf, "voltage\n"); | |
407 | case REGULATOR_CURRENT: | |
408 | return sprintf(buf, "current\n"); | |
409 | } | |
410 | return sprintf(buf, "unknown\n"); | |
411 | } | |
412 | ||
413 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
414 | struct device_attribute *attr, char *buf) | |
415 | { | |
a5766f11 | 416 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 417 | |
414c70cb LG |
418 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
419 | } | |
7ad68e2f DB |
420 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
421 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
422 | |
423 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
424 | struct device_attribute *attr, char *buf) | |
425 | { | |
a5766f11 | 426 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 427 | |
414c70cb LG |
428 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
429 | } | |
7ad68e2f DB |
430 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
431 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
432 | |
433 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
434 | struct device_attribute *attr, char *buf) | |
435 | { | |
a5766f11 | 436 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 437 | |
414c70cb LG |
438 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
439 | } | |
7ad68e2f DB |
440 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
441 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 442 | |
414c70cb LG |
443 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
444 | struct device_attribute *attr, char *buf) | |
445 | { | |
a5766f11 | 446 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 447 | |
4fca9545 DB |
448 | return regulator_print_opmode(buf, |
449 | rdev->constraints->state_mem.mode); | |
414c70cb | 450 | } |
7ad68e2f DB |
451 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
452 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
453 | |
454 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
455 | struct device_attribute *attr, char *buf) | |
456 | { | |
a5766f11 | 457 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 458 | |
4fca9545 DB |
459 | return regulator_print_opmode(buf, |
460 | rdev->constraints->state_disk.mode); | |
414c70cb | 461 | } |
7ad68e2f DB |
462 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
463 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
464 | |
465 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
a5766f11 | 468 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 469 | |
4fca9545 DB |
470 | return regulator_print_opmode(buf, |
471 | rdev->constraints->state_standby.mode); | |
414c70cb | 472 | } |
7ad68e2f DB |
473 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
474 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
475 | |
476 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
477 | struct device_attribute *attr, char *buf) | |
478 | { | |
a5766f11 | 479 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 480 | |
4fca9545 DB |
481 | return regulator_print_state(buf, |
482 | rdev->constraints->state_mem.enabled); | |
414c70cb | 483 | } |
7ad68e2f DB |
484 | static DEVICE_ATTR(suspend_mem_state, 0444, |
485 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
486 | |
487 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
488 | struct device_attribute *attr, char *buf) | |
489 | { | |
a5766f11 | 490 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 491 | |
4fca9545 DB |
492 | return regulator_print_state(buf, |
493 | rdev->constraints->state_disk.enabled); | |
414c70cb | 494 | } |
7ad68e2f DB |
495 | static DEVICE_ATTR(suspend_disk_state, 0444, |
496 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
497 | |
498 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
499 | struct device_attribute *attr, char *buf) | |
500 | { | |
a5766f11 | 501 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 502 | |
4fca9545 DB |
503 | return regulator_print_state(buf, |
504 | rdev->constraints->state_standby.enabled); | |
414c70cb | 505 | } |
7ad68e2f DB |
506 | static DEVICE_ATTR(suspend_standby_state, 0444, |
507 | regulator_suspend_standby_state_show, NULL); | |
508 | ||
bc558a60 | 509 | |
7ad68e2f DB |
510 | /* |
511 | * These are the only attributes are present for all regulators. | |
512 | * Other attributes are a function of regulator functionality. | |
513 | */ | |
414c70cb | 514 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 515 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
516 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
517 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
518 | __ATTR_NULL, |
519 | }; | |
520 | ||
521 | static void regulator_dev_release(struct device *dev) | |
522 | { | |
a5766f11 | 523 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
524 | kfree(rdev); |
525 | } | |
526 | ||
527 | static struct class regulator_class = { | |
528 | .name = "regulator", | |
529 | .dev_release = regulator_dev_release, | |
530 | .dev_attrs = regulator_dev_attrs, | |
531 | }; | |
532 | ||
533 | /* Calculate the new optimum regulator operating mode based on the new total | |
534 | * consumer load. All locks held by caller */ | |
535 | static void drms_uA_update(struct regulator_dev *rdev) | |
536 | { | |
537 | struct regulator *sibling; | |
538 | int current_uA = 0, output_uV, input_uV, err; | |
539 | unsigned int mode; | |
540 | ||
541 | err = regulator_check_drms(rdev); | |
542 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
543 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); | |
544 | return; | |
545 | ||
546 | /* get output voltage */ | |
547 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
548 | if (output_uV <= 0) | |
549 | return; | |
550 | ||
551 | /* get input voltage */ | |
552 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
553 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
554 | else | |
555 | input_uV = rdev->constraints->input_uV; | |
556 | if (input_uV <= 0) | |
557 | return; | |
558 | ||
559 | /* calc total requested load */ | |
560 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
561 | current_uA += sibling->uA_load; | |
562 | ||
563 | /* now get the optimum mode for our new total regulator load */ | |
564 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
565 | output_uV, current_uA); | |
566 | ||
567 | /* check the new mode is allowed */ | |
568 | err = regulator_check_mode(rdev, mode); | |
569 | if (err == 0) | |
570 | rdev->desc->ops->set_mode(rdev, mode); | |
571 | } | |
572 | ||
573 | static int suspend_set_state(struct regulator_dev *rdev, | |
574 | struct regulator_state *rstate) | |
575 | { | |
576 | int ret = 0; | |
577 | ||
578 | /* enable & disable are mandatory for suspend control */ | |
579 | if (!rdev->desc->ops->set_suspend_enable || | |
a5766f11 LG |
580 | !rdev->desc->ops->set_suspend_disable) { |
581 | printk(KERN_ERR "%s: no way to set suspend state\n", | |
582 | __func__); | |
414c70cb | 583 | return -EINVAL; |
a5766f11 | 584 | } |
414c70cb LG |
585 | |
586 | if (rstate->enabled) | |
587 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
588 | else | |
589 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
590 | if (ret < 0) { | |
591 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
592 | return ret; | |
593 | } | |
594 | ||
595 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
596 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
597 | if (ret < 0) { | |
598 | printk(KERN_ERR "%s: failed to set voltage\n", | |
599 | __func__); | |
600 | return ret; | |
601 | } | |
602 | } | |
603 | ||
604 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
605 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
606 | if (ret < 0) { | |
607 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
608 | return ret; | |
609 | } | |
610 | } | |
611 | return ret; | |
612 | } | |
613 | ||
614 | /* locks held by caller */ | |
615 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
616 | { | |
617 | if (!rdev->constraints) | |
618 | return -EINVAL; | |
619 | ||
620 | switch (state) { | |
621 | case PM_SUSPEND_STANDBY: | |
622 | return suspend_set_state(rdev, | |
623 | &rdev->constraints->state_standby); | |
624 | case PM_SUSPEND_MEM: | |
625 | return suspend_set_state(rdev, | |
626 | &rdev->constraints->state_mem); | |
627 | case PM_SUSPEND_MAX: | |
628 | return suspend_set_state(rdev, | |
629 | &rdev->constraints->state_disk); | |
630 | default: | |
631 | return -EINVAL; | |
632 | } | |
633 | } | |
634 | ||
635 | static void print_constraints(struct regulator_dev *rdev) | |
636 | { | |
637 | struct regulation_constraints *constraints = rdev->constraints; | |
638 | char buf[80]; | |
639 | int count; | |
640 | ||
641 | if (rdev->desc->type == REGULATOR_VOLTAGE) { | |
642 | if (constraints->min_uV == constraints->max_uV) | |
643 | count = sprintf(buf, "%d mV ", | |
644 | constraints->min_uV / 1000); | |
645 | else | |
646 | count = sprintf(buf, "%d <--> %d mV ", | |
647 | constraints->min_uV / 1000, | |
648 | constraints->max_uV / 1000); | |
649 | } else { | |
650 | if (constraints->min_uA == constraints->max_uA) | |
651 | count = sprintf(buf, "%d mA ", | |
652 | constraints->min_uA / 1000); | |
653 | else | |
654 | count = sprintf(buf, "%d <--> %d mA ", | |
655 | constraints->min_uA / 1000, | |
656 | constraints->max_uA / 1000); | |
657 | } | |
658 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) | |
659 | count += sprintf(buf + count, "fast "); | |
660 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
661 | count += sprintf(buf + count, "normal "); | |
662 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
663 | count += sprintf(buf + count, "idle "); | |
664 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
665 | count += sprintf(buf + count, "standby"); | |
666 | ||
667 | printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf); | |
668 | } | |
669 | ||
a5766f11 LG |
670 | /** |
671 | * set_machine_constraints - sets regulator constraints | |
69279fb9 | 672 | * @rdev: regulator source |
c8e7e464 | 673 | * @constraints: constraints to apply |
a5766f11 LG |
674 | * |
675 | * Allows platform initialisation code to define and constrain | |
676 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
677 | * Constraints *must* be set by platform code in order for some | |
678 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
679 | * set_mode. | |
680 | */ | |
681 | static int set_machine_constraints(struct regulator_dev *rdev, | |
682 | struct regulation_constraints *constraints) | |
683 | { | |
684 | int ret = 0; | |
e06f5b4f | 685 | const char *name; |
e5fda26c | 686 | struct regulator_ops *ops = rdev->desc->ops; |
e06f5b4f MB |
687 | |
688 | if (constraints->name) | |
689 | name = constraints->name; | |
690 | else if (rdev->desc->name) | |
691 | name = rdev->desc->name; | |
692 | else | |
693 | name = "regulator"; | |
a5766f11 | 694 | |
4367cfdc DB |
695 | /* constrain machine-level voltage specs to fit |
696 | * the actual range supported by this regulator. | |
697 | */ | |
698 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
699 | int count = rdev->desc->n_voltages; | |
700 | int i; | |
701 | int min_uV = INT_MAX; | |
702 | int max_uV = INT_MIN; | |
703 | int cmin = constraints->min_uV; | |
704 | int cmax = constraints->max_uV; | |
705 | ||
706 | /* it's safe to autoconfigure fixed-voltage supplies */ | |
707 | if (count == 1 && !cmin) { | |
708 | cmin = INT_MIN; | |
709 | cmax = INT_MAX; | |
710 | } | |
711 | ||
3e2b9abd MB |
712 | /* voltage constraints are optional */ |
713 | if ((cmin == 0) && (cmax == 0)) | |
714 | goto out; | |
715 | ||
4367cfdc | 716 | /* else require explicit machine-level constraints */ |
3e2b9abd | 717 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
718 | pr_err("%s: %s '%s' voltage constraints\n", |
719 | __func__, "invalid", name); | |
720 | ret = -EINVAL; | |
721 | goto out; | |
722 | } | |
723 | ||
724 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
725 | for (i = 0; i < count; i++) { | |
726 | int value; | |
727 | ||
728 | value = ops->list_voltage(rdev, i); | |
729 | if (value <= 0) | |
730 | continue; | |
731 | ||
732 | /* maybe adjust [min_uV..max_uV] */ | |
733 | if (value >= cmin && value < min_uV) | |
734 | min_uV = value; | |
735 | if (value <= cmax && value > max_uV) | |
736 | max_uV = value; | |
737 | } | |
738 | ||
739 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
740 | if (max_uV < min_uV) { | |
741 | pr_err("%s: %s '%s' voltage constraints\n", | |
742 | __func__, "unsupportable", name); | |
743 | ret = -EINVAL; | |
744 | goto out; | |
745 | } | |
746 | ||
747 | /* use regulator's subset of machine constraints */ | |
748 | if (constraints->min_uV < min_uV) { | |
749 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
750 | __func__, name, "min_uV", | |
751 | constraints->min_uV, min_uV); | |
752 | constraints->min_uV = min_uV; | |
753 | } | |
754 | if (constraints->max_uV > max_uV) { | |
755 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
756 | __func__, name, "max_uV", | |
757 | constraints->max_uV, max_uV); | |
758 | constraints->max_uV = max_uV; | |
759 | } | |
760 | } | |
761 | ||
a5766f11 LG |
762 | rdev->constraints = constraints; |
763 | ||
764 | /* do we need to apply the constraint voltage */ | |
765 | if (rdev->constraints->apply_uV && | |
766 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
e5fda26c MB |
767 | ops->set_voltage) { |
768 | ret = ops->set_voltage(rdev, | |
a5766f11 LG |
769 | rdev->constraints->min_uV, rdev->constraints->max_uV); |
770 | if (ret < 0) { | |
e06f5b4f MB |
771 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", |
772 | __func__, | |
773 | rdev->constraints->min_uV, name); | |
a5766f11 LG |
774 | rdev->constraints = NULL; |
775 | goto out; | |
776 | } | |
777 | } | |
778 | ||
a5766f11 | 779 | /* do we need to setup our suspend state */ |
e06f5b4f | 780 | if (constraints->initial_state) { |
a5766f11 | 781 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
782 | if (ret < 0) { |
783 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
784 | __func__, name); | |
785 | rdev->constraints = NULL; | |
786 | goto out; | |
787 | } | |
788 | } | |
a5766f11 | 789 | |
a308466c MB |
790 | if (constraints->initial_mode) { |
791 | if (!ops->set_mode) { | |
792 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
793 | __func__, name); | |
794 | ret = -EINVAL; | |
795 | goto out; | |
796 | } | |
797 | ||
798 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
799 | if (ret < 0) { | |
800 | printk(KERN_ERR | |
801 | "%s: failed to set initial mode for %s: %d\n", | |
802 | __func__, name, ret); | |
803 | goto out; | |
804 | } | |
805 | } | |
806 | ||
cacf90f2 MB |
807 | /* If the constraints say the regulator should be on at this point |
808 | * and we have control then make sure it is enabled. | |
809 | */ | |
810 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
811 | ret = ops->enable(rdev); |
812 | if (ret < 0) { | |
813 | printk(KERN_ERR "%s: failed to enable %s\n", | |
814 | __func__, name); | |
815 | rdev->constraints = NULL; | |
816 | goto out; | |
817 | } | |
818 | } | |
819 | ||
a5766f11 LG |
820 | print_constraints(rdev); |
821 | out: | |
822 | return ret; | |
823 | } | |
824 | ||
825 | /** | |
826 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
827 | * @rdev: regulator name |
828 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
829 | * |
830 | * Called by platform initialisation code to set the supply regulator for this | |
831 | * regulator. This ensures that a regulators supply will also be enabled by the | |
832 | * core if it's child is enabled. | |
833 | */ | |
834 | static int set_supply(struct regulator_dev *rdev, | |
835 | struct regulator_dev *supply_rdev) | |
836 | { | |
837 | int err; | |
838 | ||
839 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
840 | "supply"); | |
841 | if (err) { | |
842 | printk(KERN_ERR | |
843 | "%s: could not add device link %s err %d\n", | |
844 | __func__, supply_rdev->dev.kobj.name, err); | |
845 | goto out; | |
846 | } | |
847 | rdev->supply = supply_rdev; | |
848 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
849 | out: | |
850 | return err; | |
851 | } | |
852 | ||
853 | /** | |
854 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
855 | * @rdev: regulator source |
856 | * @consumer_dev: device the supply applies to | |
857 | * @supply: symbolic name for supply | |
a5766f11 LG |
858 | * |
859 | * Allows platform initialisation code to map physical regulator | |
860 | * sources to symbolic names for supplies for use by devices. Devices | |
861 | * should use these symbolic names to request regulators, avoiding the | |
862 | * need to provide board-specific regulator names as platform data. | |
863 | */ | |
864 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
865 | struct device *consumer_dev, const char *supply) | |
866 | { | |
867 | struct regulator_map *node; | |
868 | ||
869 | if (supply == NULL) | |
870 | return -EINVAL; | |
871 | ||
6001e13c DB |
872 | list_for_each_entry(node, ®ulator_map_list, list) { |
873 | if (consumer_dev != node->dev) | |
874 | continue; | |
875 | if (strcmp(node->supply, supply) != 0) | |
876 | continue; | |
877 | ||
878 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
879 | dev_name(&node->regulator->dev), | |
880 | node->regulator->desc->name, | |
881 | supply, | |
882 | dev_name(&rdev->dev), rdev->desc->name); | |
883 | return -EBUSY; | |
884 | } | |
885 | ||
a5766f11 LG |
886 | node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); |
887 | if (node == NULL) | |
888 | return -ENOMEM; | |
889 | ||
890 | node->regulator = rdev; | |
891 | node->dev = consumer_dev; | |
892 | node->supply = supply; | |
893 | ||
894 | list_add(&node->list, ®ulator_map_list); | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static void unset_consumer_device_supply(struct regulator_dev *rdev, | |
899 | struct device *consumer_dev) | |
900 | { | |
901 | struct regulator_map *node, *n; | |
902 | ||
903 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
904 | if (rdev == node->regulator && | |
905 | consumer_dev == node->dev) { | |
906 | list_del(&node->list); | |
907 | kfree(node); | |
908 | return; | |
909 | } | |
910 | } | |
911 | } | |
912 | ||
0f1d747b MR |
913 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
914 | { | |
915 | struct regulator_map *node, *n; | |
916 | ||
917 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
918 | if (rdev == node->regulator) { | |
919 | list_del(&node->list); | |
920 | kfree(node); | |
921 | return; | |
922 | } | |
923 | } | |
924 | } | |
925 | ||
414c70cb LG |
926 | #define REG_STR_SIZE 32 |
927 | ||
928 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
929 | struct device *dev, | |
930 | const char *supply_name) | |
931 | { | |
932 | struct regulator *regulator; | |
933 | char buf[REG_STR_SIZE]; | |
934 | int err, size; | |
935 | ||
936 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
937 | if (regulator == NULL) | |
938 | return NULL; | |
939 | ||
940 | mutex_lock(&rdev->mutex); | |
941 | regulator->rdev = rdev; | |
942 | list_add(®ulator->list, &rdev->consumer_list); | |
943 | ||
944 | if (dev) { | |
945 | /* create a 'requested_microamps_name' sysfs entry */ | |
946 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
947 | supply_name); | |
948 | if (size >= REG_STR_SIZE) | |
949 | goto overflow_err; | |
950 | ||
951 | regulator->dev = dev; | |
952 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); | |
953 | if (regulator->dev_attr.attr.name == NULL) | |
954 | goto attr_name_err; | |
955 | ||
956 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
957 | regulator->dev_attr.attr.mode = 0444; | |
958 | regulator->dev_attr.show = device_requested_uA_show; | |
959 | err = device_create_file(dev, ®ulator->dev_attr); | |
960 | if (err < 0) { | |
961 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
962 | " load sysfs\n", __func__); | |
963 | goto attr_name_err; | |
964 | } | |
965 | ||
966 | /* also add a link to the device sysfs entry */ | |
967 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
968 | dev->kobj.name, supply_name); | |
969 | if (size >= REG_STR_SIZE) | |
970 | goto attr_err; | |
971 | ||
972 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
973 | if (regulator->supply_name == NULL) | |
974 | goto attr_err; | |
975 | ||
976 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
977 | buf); | |
978 | if (err) { | |
979 | printk(KERN_WARNING | |
980 | "%s: could not add device link %s err %d\n", | |
981 | __func__, dev->kobj.name, err); | |
982 | device_remove_file(dev, ®ulator->dev_attr); | |
983 | goto link_name_err; | |
984 | } | |
985 | } | |
986 | mutex_unlock(&rdev->mutex); | |
987 | return regulator; | |
988 | link_name_err: | |
989 | kfree(regulator->supply_name); | |
990 | attr_err: | |
991 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
992 | attr_name_err: | |
993 | kfree(regulator->dev_attr.attr.name); | |
994 | overflow_err: | |
995 | list_del(®ulator->list); | |
996 | kfree(regulator); | |
997 | mutex_unlock(&rdev->mutex); | |
998 | return NULL; | |
999 | } | |
1000 | ||
1001 | /** | |
1002 | * regulator_get - lookup and obtain a reference to a regulator. | |
1003 | * @dev: device for regulator "consumer" | |
1004 | * @id: Supply name or regulator ID. | |
1005 | * | |
1006 | * Returns a struct regulator corresponding to the regulator producer, | |
fe203ddf MB |
1007 | * or IS_ERR() condition containing errno. |
1008 | * | |
1009 | * Use of supply names configured via regulator_set_device_supply() is | |
1010 | * strongly encouraged. It is recommended that the supply name used | |
1011 | * should match the name used for the supply and/or the relevant | |
1012 | * device pins in the datasheet. | |
414c70cb LG |
1013 | */ |
1014 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1015 | { | |
1016 | struct regulator_dev *rdev; | |
1017 | struct regulator_map *map; | |
1018 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
414c70cb LG |
1019 | |
1020 | if (id == NULL) { | |
1021 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1022 | return regulator; | |
1023 | } | |
1024 | ||
1025 | mutex_lock(®ulator_list_mutex); | |
1026 | ||
1027 | list_for_each_entry(map, ®ulator_map_list, list) { | |
1028 | if (dev == map->dev && | |
1029 | strcmp(map->supply, id) == 0) { | |
a5766f11 | 1030 | rdev = map->regulator; |
414c70cb | 1031 | goto found; |
a5766f11 | 1032 | } |
414c70cb | 1033 | } |
414c70cb LG |
1034 | mutex_unlock(®ulator_list_mutex); |
1035 | return regulator; | |
1036 | ||
1037 | found: | |
a5766f11 LG |
1038 | if (!try_module_get(rdev->owner)) |
1039 | goto out; | |
1040 | ||
414c70cb LG |
1041 | regulator = create_regulator(rdev, dev, id); |
1042 | if (regulator == NULL) { | |
1043 | regulator = ERR_PTR(-ENOMEM); | |
1044 | module_put(rdev->owner); | |
1045 | } | |
1046 | ||
a5766f11 | 1047 | out: |
414c70cb LG |
1048 | mutex_unlock(®ulator_list_mutex); |
1049 | return regulator; | |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(regulator_get); | |
1052 | ||
1053 | /** | |
1054 | * regulator_put - "free" the regulator source | |
1055 | * @regulator: regulator source | |
1056 | * | |
1057 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1058 | * regulator source are balanced by regulator_disable calls prior to calling | |
1059 | * this function. | |
1060 | */ | |
1061 | void regulator_put(struct regulator *regulator) | |
1062 | { | |
1063 | struct regulator_dev *rdev; | |
1064 | ||
1065 | if (regulator == NULL || IS_ERR(regulator)) | |
1066 | return; | |
1067 | ||
414c70cb LG |
1068 | mutex_lock(®ulator_list_mutex); |
1069 | rdev = regulator->rdev; | |
1070 | ||
1071 | /* remove any sysfs entries */ | |
1072 | if (regulator->dev) { | |
1073 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1074 | kfree(regulator->supply_name); | |
1075 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1076 | kfree(regulator->dev_attr.attr.name); | |
1077 | } | |
1078 | list_del(®ulator->list); | |
1079 | kfree(regulator); | |
1080 | ||
1081 | module_put(rdev->owner); | |
1082 | mutex_unlock(®ulator_list_mutex); | |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(regulator_put); | |
1085 | ||
1086 | /* locks held by regulator_enable() */ | |
1087 | static int _regulator_enable(struct regulator_dev *rdev) | |
1088 | { | |
1089 | int ret = -EINVAL; | |
1090 | ||
1091 | if (!rdev->constraints) { | |
1092 | printk(KERN_ERR "%s: %s has no constraints\n", | |
1093 | __func__, rdev->desc->name); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | /* do we need to enable the supply regulator first */ | |
1098 | if (rdev->supply) { | |
1099 | ret = _regulator_enable(rdev->supply); | |
1100 | if (ret < 0) { | |
1101 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1102 | __func__, rdev->desc->name, ret); | |
1103 | return ret; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* check voltage and requested load before enabling */ | |
1108 | if (rdev->desc->ops->enable) { | |
1109 | ||
1110 | if (rdev->constraints && | |
1111 | (rdev->constraints->valid_ops_mask & | |
1112 | REGULATOR_CHANGE_DRMS)) | |
1113 | drms_uA_update(rdev); | |
1114 | ||
1115 | ret = rdev->desc->ops->enable(rdev); | |
1116 | if (ret < 0) { | |
1117 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1118 | __func__, rdev->desc->name, ret); | |
1119 | return ret; | |
1120 | } | |
1121 | rdev->use_count++; | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | return ret; | |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * regulator_enable - enable regulator output | |
1130 | * @regulator: regulator source | |
1131 | * | |
cf7bbcdf MB |
1132 | * Request that the regulator be enabled with the regulator output at |
1133 | * the predefined voltage or current value. Calls to regulator_enable() | |
1134 | * must be balanced with calls to regulator_disable(). | |
1135 | * | |
414c70cb | 1136 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1137 | * hardwired in the regulator. |
414c70cb LG |
1138 | */ |
1139 | int regulator_enable(struct regulator *regulator) | |
1140 | { | |
412aec61 DB |
1141 | struct regulator_dev *rdev = regulator->rdev; |
1142 | int ret = 0; | |
414c70cb | 1143 | |
412aec61 | 1144 | mutex_lock(&rdev->mutex); |
cd94b505 | 1145 | ret = _regulator_enable(rdev); |
412aec61 | 1146 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1147 | return ret; |
1148 | } | |
1149 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1150 | ||
1151 | /* locks held by regulator_disable() */ | |
1152 | static int _regulator_disable(struct regulator_dev *rdev) | |
1153 | { | |
1154 | int ret = 0; | |
1155 | ||
cd94b505 DB |
1156 | if (WARN(rdev->use_count <= 0, |
1157 | "unbalanced disables for %s\n", | |
1158 | rdev->desc->name)) | |
1159 | return -EIO; | |
1160 | ||
414c70cb LG |
1161 | /* are we the last user and permitted to disable ? */ |
1162 | if (rdev->use_count == 1 && !rdev->constraints->always_on) { | |
1163 | ||
1164 | /* we are last user */ | |
1165 | if (rdev->desc->ops->disable) { | |
1166 | ret = rdev->desc->ops->disable(rdev); | |
1167 | if (ret < 0) { | |
1168 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1169 | __func__, rdev->desc->name); | |
1170 | return ret; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | /* decrease our supplies ref count and disable if required */ | |
1175 | if (rdev->supply) | |
1176 | _regulator_disable(rdev->supply); | |
1177 | ||
1178 | rdev->use_count = 0; | |
1179 | } else if (rdev->use_count > 1) { | |
1180 | ||
1181 | if (rdev->constraints && | |
1182 | (rdev->constraints->valid_ops_mask & | |
1183 | REGULATOR_CHANGE_DRMS)) | |
1184 | drms_uA_update(rdev); | |
1185 | ||
1186 | rdev->use_count--; | |
1187 | } | |
1188 | return ret; | |
1189 | } | |
1190 | ||
1191 | /** | |
1192 | * regulator_disable - disable regulator output | |
1193 | * @regulator: regulator source | |
1194 | * | |
cf7bbcdf MB |
1195 | * Disable the regulator output voltage or current. Calls to |
1196 | * regulator_enable() must be balanced with calls to | |
1197 | * regulator_disable(). | |
69279fb9 | 1198 | * |
414c70cb | 1199 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1200 | * devices have it enabled, the regulator device supports disabling and |
1201 | * machine constraints permit this operation. | |
414c70cb LG |
1202 | */ |
1203 | int regulator_disable(struct regulator *regulator) | |
1204 | { | |
412aec61 DB |
1205 | struct regulator_dev *rdev = regulator->rdev; |
1206 | int ret = 0; | |
414c70cb | 1207 | |
412aec61 | 1208 | mutex_lock(&rdev->mutex); |
cd94b505 | 1209 | ret = _regulator_disable(rdev); |
412aec61 | 1210 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1211 | return ret; |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1214 | ||
1215 | /* locks held by regulator_force_disable() */ | |
1216 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1217 | { | |
1218 | int ret = 0; | |
1219 | ||
1220 | /* force disable */ | |
1221 | if (rdev->desc->ops->disable) { | |
1222 | /* ah well, who wants to live forever... */ | |
1223 | ret = rdev->desc->ops->disable(rdev); | |
1224 | if (ret < 0) { | |
1225 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1226 | __func__, rdev->desc->name); | |
1227 | return ret; | |
1228 | } | |
1229 | /* notify other consumers that power has been forced off */ | |
1230 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, | |
1231 | NULL); | |
1232 | } | |
1233 | ||
1234 | /* decrease our supplies ref count and disable if required */ | |
1235 | if (rdev->supply) | |
1236 | _regulator_disable(rdev->supply); | |
1237 | ||
1238 | rdev->use_count = 0; | |
1239 | return ret; | |
1240 | } | |
1241 | ||
1242 | /** | |
1243 | * regulator_force_disable - force disable regulator output | |
1244 | * @regulator: regulator source | |
1245 | * | |
1246 | * Forcibly disable the regulator output voltage or current. | |
1247 | * NOTE: this *will* disable the regulator output even if other consumer | |
1248 | * devices have it enabled. This should be used for situations when device | |
1249 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1250 | */ | |
1251 | int regulator_force_disable(struct regulator *regulator) | |
1252 | { | |
1253 | int ret; | |
1254 | ||
1255 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1256 | regulator->uA_load = 0; |
1257 | ret = _regulator_force_disable(regulator->rdev); | |
1258 | mutex_unlock(®ulator->rdev->mutex); | |
1259 | return ret; | |
1260 | } | |
1261 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1262 | ||
1263 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1264 | { | |
1265 | int ret; | |
1266 | ||
1267 | mutex_lock(&rdev->mutex); | |
1268 | ||
1269 | /* sanity check */ | |
1270 | if (!rdev->desc->ops->is_enabled) { | |
1271 | ret = -EINVAL; | |
1272 | goto out; | |
1273 | } | |
1274 | ||
1275 | ret = rdev->desc->ops->is_enabled(rdev); | |
1276 | out: | |
1277 | mutex_unlock(&rdev->mutex); | |
1278 | return ret; | |
1279 | } | |
1280 | ||
1281 | /** | |
1282 | * regulator_is_enabled - is the regulator output enabled | |
1283 | * @regulator: regulator source | |
1284 | * | |
412aec61 DB |
1285 | * Returns positive if the regulator driver backing the source/client |
1286 | * has requested that the device be enabled, zero if it hasn't, else a | |
1287 | * negative errno code. | |
1288 | * | |
1289 | * Note that the device backing this regulator handle can have multiple | |
1290 | * users, so it might be enabled even if regulator_enable() was never | |
1291 | * called for this particular source. | |
414c70cb LG |
1292 | */ |
1293 | int regulator_is_enabled(struct regulator *regulator) | |
1294 | { | |
1295 | return _regulator_is_enabled(regulator->rdev); | |
1296 | } | |
1297 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1298 | ||
4367cfdc DB |
1299 | /** |
1300 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1301 | * @regulator: regulator source | |
1302 | * | |
1303 | * Returns number of selectors, or negative errno. Selectors are | |
1304 | * numbered starting at zero, and typically correspond to bitfields | |
1305 | * in hardware registers. | |
1306 | */ | |
1307 | int regulator_count_voltages(struct regulator *regulator) | |
1308 | { | |
1309 | struct regulator_dev *rdev = regulator->rdev; | |
1310 | ||
1311 | return rdev->desc->n_voltages ? : -EINVAL; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1314 | ||
1315 | /** | |
1316 | * regulator_list_voltage - enumerate supported voltages | |
1317 | * @regulator: regulator source | |
1318 | * @selector: identify voltage to list | |
1319 | * Context: can sleep | |
1320 | * | |
1321 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
1322 | * zero if this selector code can't be used on this sytem, or a | |
1323 | * negative errno. | |
1324 | */ | |
1325 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1326 | { | |
1327 | struct regulator_dev *rdev = regulator->rdev; | |
1328 | struct regulator_ops *ops = rdev->desc->ops; | |
1329 | int ret; | |
1330 | ||
1331 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1332 | return -EINVAL; | |
1333 | ||
1334 | mutex_lock(&rdev->mutex); | |
1335 | ret = ops->list_voltage(rdev, selector); | |
1336 | mutex_unlock(&rdev->mutex); | |
1337 | ||
1338 | if (ret > 0) { | |
1339 | if (ret < rdev->constraints->min_uV) | |
1340 | ret = 0; | |
1341 | else if (ret > rdev->constraints->max_uV) | |
1342 | ret = 0; | |
1343 | } | |
1344 | ||
1345 | return ret; | |
1346 | } | |
1347 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1348 | ||
414c70cb LG |
1349 | /** |
1350 | * regulator_set_voltage - set regulator output voltage | |
1351 | * @regulator: regulator source | |
1352 | * @min_uV: Minimum required voltage in uV | |
1353 | * @max_uV: Maximum acceptable voltage in uV | |
1354 | * | |
1355 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1356 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1357 | * | |
1358 | * If the regulator is enabled then the voltage will change to the new value | |
1359 | * immediately otherwise if the regulator is disabled the regulator will | |
1360 | * output at the new voltage when enabled. | |
1361 | * | |
1362 | * NOTE: If the regulator is shared between several devices then the lowest | |
1363 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1364 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1365 | * calling this function otherwise this call will fail. |
1366 | */ | |
1367 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1368 | { | |
1369 | struct regulator_dev *rdev = regulator->rdev; | |
1370 | int ret; | |
1371 | ||
1372 | mutex_lock(&rdev->mutex); | |
1373 | ||
1374 | /* sanity check */ | |
1375 | if (!rdev->desc->ops->set_voltage) { | |
1376 | ret = -EINVAL; | |
1377 | goto out; | |
1378 | } | |
1379 | ||
1380 | /* constraints check */ | |
1381 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1382 | if (ret < 0) | |
1383 | goto out; | |
1384 | regulator->min_uV = min_uV; | |
1385 | regulator->max_uV = max_uV; | |
1386 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1387 | ||
1388 | out: | |
b136fb44 | 1389 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1390 | mutex_unlock(&rdev->mutex); |
1391 | return ret; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1394 | ||
1395 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1396 | { | |
1397 | /* sanity check */ | |
1398 | if (rdev->desc->ops->get_voltage) | |
1399 | return rdev->desc->ops->get_voltage(rdev); | |
1400 | else | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | ||
1404 | /** | |
1405 | * regulator_get_voltage - get regulator output voltage | |
1406 | * @regulator: regulator source | |
1407 | * | |
1408 | * This returns the current regulator voltage in uV. | |
1409 | * | |
1410 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1411 | * function should not be used to determine regulator state. | |
1412 | */ | |
1413 | int regulator_get_voltage(struct regulator *regulator) | |
1414 | { | |
1415 | int ret; | |
1416 | ||
1417 | mutex_lock(®ulator->rdev->mutex); | |
1418 | ||
1419 | ret = _regulator_get_voltage(regulator->rdev); | |
1420 | ||
1421 | mutex_unlock(®ulator->rdev->mutex); | |
1422 | ||
1423 | return ret; | |
1424 | } | |
1425 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1426 | ||
1427 | /** | |
1428 | * regulator_set_current_limit - set regulator output current limit | |
1429 | * @regulator: regulator source | |
1430 | * @min_uA: Minimuum supported current in uA | |
1431 | * @max_uA: Maximum supported current in uA | |
1432 | * | |
1433 | * Sets current sink to the desired output current. This can be set during | |
1434 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1435 | * | |
1436 | * If the regulator is enabled then the current will change to the new value | |
1437 | * immediately otherwise if the regulator is disabled the regulator will | |
1438 | * output at the new current when enabled. | |
1439 | * | |
1440 | * NOTE: Regulator system constraints must be set for this regulator before | |
1441 | * calling this function otherwise this call will fail. | |
1442 | */ | |
1443 | int regulator_set_current_limit(struct regulator *regulator, | |
1444 | int min_uA, int max_uA) | |
1445 | { | |
1446 | struct regulator_dev *rdev = regulator->rdev; | |
1447 | int ret; | |
1448 | ||
1449 | mutex_lock(&rdev->mutex); | |
1450 | ||
1451 | /* sanity check */ | |
1452 | if (!rdev->desc->ops->set_current_limit) { | |
1453 | ret = -EINVAL; | |
1454 | goto out; | |
1455 | } | |
1456 | ||
1457 | /* constraints check */ | |
1458 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1459 | if (ret < 0) | |
1460 | goto out; | |
1461 | ||
1462 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1463 | out: | |
1464 | mutex_unlock(&rdev->mutex); | |
1465 | return ret; | |
1466 | } | |
1467 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1468 | ||
1469 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1470 | { | |
1471 | int ret; | |
1472 | ||
1473 | mutex_lock(&rdev->mutex); | |
1474 | ||
1475 | /* sanity check */ | |
1476 | if (!rdev->desc->ops->get_current_limit) { | |
1477 | ret = -EINVAL; | |
1478 | goto out; | |
1479 | } | |
1480 | ||
1481 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1482 | out: | |
1483 | mutex_unlock(&rdev->mutex); | |
1484 | return ret; | |
1485 | } | |
1486 | ||
1487 | /** | |
1488 | * regulator_get_current_limit - get regulator output current | |
1489 | * @regulator: regulator source | |
1490 | * | |
1491 | * This returns the current supplied by the specified current sink in uA. | |
1492 | * | |
1493 | * NOTE: If the regulator is disabled it will return the current value. This | |
1494 | * function should not be used to determine regulator state. | |
1495 | */ | |
1496 | int regulator_get_current_limit(struct regulator *regulator) | |
1497 | { | |
1498 | return _regulator_get_current_limit(regulator->rdev); | |
1499 | } | |
1500 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1501 | ||
1502 | /** | |
1503 | * regulator_set_mode - set regulator operating mode | |
1504 | * @regulator: regulator source | |
1505 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1506 | * | |
1507 | * Set regulator operating mode to increase regulator efficiency or improve | |
1508 | * regulation performance. | |
1509 | * | |
1510 | * NOTE: Regulator system constraints must be set for this regulator before | |
1511 | * calling this function otherwise this call will fail. | |
1512 | */ | |
1513 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1514 | { | |
1515 | struct regulator_dev *rdev = regulator->rdev; | |
1516 | int ret; | |
1517 | ||
1518 | mutex_lock(&rdev->mutex); | |
1519 | ||
1520 | /* sanity check */ | |
1521 | if (!rdev->desc->ops->set_mode) { | |
1522 | ret = -EINVAL; | |
1523 | goto out; | |
1524 | } | |
1525 | ||
1526 | /* constraints check */ | |
1527 | ret = regulator_check_mode(rdev, mode); | |
1528 | if (ret < 0) | |
1529 | goto out; | |
1530 | ||
1531 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1532 | out: | |
1533 | mutex_unlock(&rdev->mutex); | |
1534 | return ret; | |
1535 | } | |
1536 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1537 | ||
1538 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1539 | { | |
1540 | int ret; | |
1541 | ||
1542 | mutex_lock(&rdev->mutex); | |
1543 | ||
1544 | /* sanity check */ | |
1545 | if (!rdev->desc->ops->get_mode) { | |
1546 | ret = -EINVAL; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
1550 | ret = rdev->desc->ops->get_mode(rdev); | |
1551 | out: | |
1552 | mutex_unlock(&rdev->mutex); | |
1553 | return ret; | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * regulator_get_mode - get regulator operating mode | |
1558 | * @regulator: regulator source | |
1559 | * | |
1560 | * Get the current regulator operating mode. | |
1561 | */ | |
1562 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1563 | { | |
1564 | return _regulator_get_mode(regulator->rdev); | |
1565 | } | |
1566 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1567 | ||
1568 | /** | |
1569 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1570 | * @regulator: regulator source | |
1571 | * @uA_load: load current | |
1572 | * | |
1573 | * Notifies the regulator core of a new device load. This is then used by | |
1574 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1575 | * operating mode for the new regulator loading. | |
1576 | * | |
1577 | * Consumer devices notify their supply regulator of the maximum power | |
1578 | * they will require (can be taken from device datasheet in the power | |
1579 | * consumption tables) when they change operational status and hence power | |
1580 | * state. Examples of operational state changes that can affect power | |
1581 | * consumption are :- | |
1582 | * | |
1583 | * o Device is opened / closed. | |
1584 | * o Device I/O is about to begin or has just finished. | |
1585 | * o Device is idling in between work. | |
1586 | * | |
1587 | * This information is also exported via sysfs to userspace. | |
1588 | * | |
1589 | * DRMS will sum the total requested load on the regulator and change | |
1590 | * to the most efficient operating mode if platform constraints allow. | |
1591 | * | |
1592 | * Returns the new regulator mode or error. | |
1593 | */ | |
1594 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1595 | { | |
1596 | struct regulator_dev *rdev = regulator->rdev; | |
1597 | struct regulator *consumer; | |
1598 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1599 | unsigned int mode; | |
1600 | ||
1601 | mutex_lock(&rdev->mutex); | |
1602 | ||
1603 | regulator->uA_load = uA_load; | |
1604 | ret = regulator_check_drms(rdev); | |
1605 | if (ret < 0) | |
1606 | goto out; | |
1607 | ret = -EINVAL; | |
1608 | ||
1609 | /* sanity check */ | |
1610 | if (!rdev->desc->ops->get_optimum_mode) | |
1611 | goto out; | |
1612 | ||
1613 | /* get output voltage */ | |
1614 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1615 | if (output_uV <= 0) { | |
1616 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1617 | __func__, rdev->desc->name); | |
1618 | goto out; | |
1619 | } | |
1620 | ||
1621 | /* get input voltage */ | |
1622 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1623 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1624 | else | |
1625 | input_uV = rdev->constraints->input_uV; | |
1626 | if (input_uV <= 0) { | |
1627 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1628 | __func__, rdev->desc->name); | |
1629 | goto out; | |
1630 | } | |
1631 | ||
1632 | /* calc total requested load for this regulator */ | |
1633 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
1634 | total_uA_load += consumer->uA_load; | |
1635 | ||
1636 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1637 | input_uV, output_uV, | |
1638 | total_uA_load); | |
e573520b DB |
1639 | ret = regulator_check_mode(rdev, mode); |
1640 | if (ret < 0) { | |
414c70cb LG |
1641 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1642 | " %d uA %d -> %d uV\n", __func__, rdev->desc->name, | |
1643 | total_uA_load, input_uV, output_uV); | |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1648 | if (ret < 0) { |
414c70cb LG |
1649 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1650 | __func__, mode, rdev->desc->name); | |
1651 | goto out; | |
1652 | } | |
1653 | ret = mode; | |
1654 | out: | |
1655 | mutex_unlock(&rdev->mutex); | |
1656 | return ret; | |
1657 | } | |
1658 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1659 | ||
1660 | /** | |
1661 | * regulator_register_notifier - register regulator event notifier | |
1662 | * @regulator: regulator source | |
69279fb9 | 1663 | * @nb: notifier block |
414c70cb LG |
1664 | * |
1665 | * Register notifier block to receive regulator events. | |
1666 | */ | |
1667 | int regulator_register_notifier(struct regulator *regulator, | |
1668 | struct notifier_block *nb) | |
1669 | { | |
1670 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1671 | nb); | |
1672 | } | |
1673 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1674 | ||
1675 | /** | |
1676 | * regulator_unregister_notifier - unregister regulator event notifier | |
1677 | * @regulator: regulator source | |
69279fb9 | 1678 | * @nb: notifier block |
414c70cb LG |
1679 | * |
1680 | * Unregister regulator event notifier block. | |
1681 | */ | |
1682 | int regulator_unregister_notifier(struct regulator *regulator, | |
1683 | struct notifier_block *nb) | |
1684 | { | |
1685 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1686 | nb); | |
1687 | } | |
1688 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1689 | ||
b136fb44 JC |
1690 | /* notify regulator consumers and downstream regulator consumers. |
1691 | * Note mutex must be held by caller. | |
1692 | */ | |
414c70cb LG |
1693 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1694 | unsigned long event, void *data) | |
1695 | { | |
1696 | struct regulator_dev *_rdev; | |
1697 | ||
1698 | /* call rdev chain first */ | |
414c70cb | 1699 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1700 | |
1701 | /* now notify regulator we supply */ | |
b136fb44 JC |
1702 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
1703 | mutex_lock(&_rdev->mutex); | |
1704 | _notifier_call_chain(_rdev, event, data); | |
1705 | mutex_unlock(&_rdev->mutex); | |
1706 | } | |
414c70cb LG |
1707 | } |
1708 | ||
1709 | /** | |
1710 | * regulator_bulk_get - get multiple regulator consumers | |
1711 | * | |
1712 | * @dev: Device to supply | |
1713 | * @num_consumers: Number of consumers to register | |
1714 | * @consumers: Configuration of consumers; clients are stored here. | |
1715 | * | |
1716 | * @return 0 on success, an errno on failure. | |
1717 | * | |
1718 | * This helper function allows drivers to get several regulator | |
1719 | * consumers in one operation. If any of the regulators cannot be | |
1720 | * acquired then any regulators that were allocated will be freed | |
1721 | * before returning to the caller. | |
1722 | */ | |
1723 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1724 | struct regulator_bulk_data *consumers) | |
1725 | { | |
1726 | int i; | |
1727 | int ret; | |
1728 | ||
1729 | for (i = 0; i < num_consumers; i++) | |
1730 | consumers[i].consumer = NULL; | |
1731 | ||
1732 | for (i = 0; i < num_consumers; i++) { | |
1733 | consumers[i].consumer = regulator_get(dev, | |
1734 | consumers[i].supply); | |
1735 | if (IS_ERR(consumers[i].consumer)) { | |
1736 | dev_err(dev, "Failed to get supply '%s'\n", | |
1737 | consumers[i].supply); | |
1738 | ret = PTR_ERR(consumers[i].consumer); | |
1739 | consumers[i].consumer = NULL; | |
1740 | goto err; | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | return 0; | |
1745 | ||
1746 | err: | |
1747 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1748 | regulator_put(consumers[i].consumer); | |
1749 | ||
1750 | return ret; | |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1753 | ||
1754 | /** | |
1755 | * regulator_bulk_enable - enable multiple regulator consumers | |
1756 | * | |
1757 | * @num_consumers: Number of consumers | |
1758 | * @consumers: Consumer data; clients are stored here. | |
1759 | * @return 0 on success, an errno on failure | |
1760 | * | |
1761 | * This convenience API allows consumers to enable multiple regulator | |
1762 | * clients in a single API call. If any consumers cannot be enabled | |
1763 | * then any others that were enabled will be disabled again prior to | |
1764 | * return. | |
1765 | */ | |
1766 | int regulator_bulk_enable(int num_consumers, | |
1767 | struct regulator_bulk_data *consumers) | |
1768 | { | |
1769 | int i; | |
1770 | int ret; | |
1771 | ||
1772 | for (i = 0; i < num_consumers; i++) { | |
1773 | ret = regulator_enable(consumers[i].consumer); | |
1774 | if (ret != 0) | |
1775 | goto err; | |
1776 | } | |
1777 | ||
1778 | return 0; | |
1779 | ||
1780 | err: | |
1781 | printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); | |
1782 | for (i = 0; i < num_consumers; i++) | |
1783 | regulator_disable(consumers[i].consumer); | |
1784 | ||
1785 | return ret; | |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
1788 | ||
1789 | /** | |
1790 | * regulator_bulk_disable - disable multiple regulator consumers | |
1791 | * | |
1792 | * @num_consumers: Number of consumers | |
1793 | * @consumers: Consumer data; clients are stored here. | |
1794 | * @return 0 on success, an errno on failure | |
1795 | * | |
1796 | * This convenience API allows consumers to disable multiple regulator | |
1797 | * clients in a single API call. If any consumers cannot be enabled | |
1798 | * then any others that were disabled will be disabled again prior to | |
1799 | * return. | |
1800 | */ | |
1801 | int regulator_bulk_disable(int num_consumers, | |
1802 | struct regulator_bulk_data *consumers) | |
1803 | { | |
1804 | int i; | |
1805 | int ret; | |
1806 | ||
1807 | for (i = 0; i < num_consumers; i++) { | |
1808 | ret = regulator_disable(consumers[i].consumer); | |
1809 | if (ret != 0) | |
1810 | goto err; | |
1811 | } | |
1812 | ||
1813 | return 0; | |
1814 | ||
1815 | err: | |
1816 | printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); | |
1817 | for (i = 0; i < num_consumers; i++) | |
1818 | regulator_enable(consumers[i].consumer); | |
1819 | ||
1820 | return ret; | |
1821 | } | |
1822 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
1823 | ||
1824 | /** | |
1825 | * regulator_bulk_free - free multiple regulator consumers | |
1826 | * | |
1827 | * @num_consumers: Number of consumers | |
1828 | * @consumers: Consumer data; clients are stored here. | |
1829 | * | |
1830 | * This convenience API allows consumers to free multiple regulator | |
1831 | * clients in a single API call. | |
1832 | */ | |
1833 | void regulator_bulk_free(int num_consumers, | |
1834 | struct regulator_bulk_data *consumers) | |
1835 | { | |
1836 | int i; | |
1837 | ||
1838 | for (i = 0; i < num_consumers; i++) { | |
1839 | regulator_put(consumers[i].consumer); | |
1840 | consumers[i].consumer = NULL; | |
1841 | } | |
1842 | } | |
1843 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
1844 | ||
1845 | /** | |
1846 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 1847 | * @rdev: regulator source |
414c70cb | 1848 | * @event: notifier block |
69279fb9 | 1849 | * @data: callback-specific data. |
414c70cb LG |
1850 | * |
1851 | * Called by regulator drivers to notify clients a regulator event has | |
1852 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 1853 | * Note lock must be held by caller. |
414c70cb LG |
1854 | */ |
1855 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
1856 | unsigned long event, void *data) | |
1857 | { | |
1858 | _notifier_call_chain(rdev, event, data); | |
1859 | return NOTIFY_DONE; | |
1860 | ||
1861 | } | |
1862 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
1863 | ||
7ad68e2f DB |
1864 | /* |
1865 | * To avoid cluttering sysfs (and memory) with useless state, only | |
1866 | * create attributes that can be meaningfully displayed. | |
1867 | */ | |
1868 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
1869 | { | |
1870 | struct device *dev = &rdev->dev; | |
1871 | struct regulator_ops *ops = rdev->desc->ops; | |
1872 | int status = 0; | |
1873 | ||
1874 | /* some attributes need specific methods to be displayed */ | |
1875 | if (ops->get_voltage) { | |
1876 | status = device_create_file(dev, &dev_attr_microvolts); | |
1877 | if (status < 0) | |
1878 | return status; | |
1879 | } | |
1880 | if (ops->get_current_limit) { | |
1881 | status = device_create_file(dev, &dev_attr_microamps); | |
1882 | if (status < 0) | |
1883 | return status; | |
1884 | } | |
1885 | if (ops->get_mode) { | |
1886 | status = device_create_file(dev, &dev_attr_opmode); | |
1887 | if (status < 0) | |
1888 | return status; | |
1889 | } | |
1890 | if (ops->is_enabled) { | |
1891 | status = device_create_file(dev, &dev_attr_state); | |
1892 | if (status < 0) | |
1893 | return status; | |
1894 | } | |
853116a1 DB |
1895 | if (ops->get_status) { |
1896 | status = device_create_file(dev, &dev_attr_status); | |
1897 | if (status < 0) | |
1898 | return status; | |
1899 | } | |
7ad68e2f DB |
1900 | |
1901 | /* some attributes are type-specific */ | |
1902 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
1903 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
1904 | if (status < 0) | |
1905 | return status; | |
1906 | } | |
1907 | ||
1908 | /* all the other attributes exist to support constraints; | |
1909 | * don't show them if there are no constraints, or if the | |
1910 | * relevant supporting methods are missing. | |
1911 | */ | |
1912 | if (!rdev->constraints) | |
1913 | return status; | |
1914 | ||
1915 | /* constraints need specific supporting methods */ | |
1916 | if (ops->set_voltage) { | |
1917 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
1918 | if (status < 0) | |
1919 | return status; | |
1920 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
1921 | if (status < 0) | |
1922 | return status; | |
1923 | } | |
1924 | if (ops->set_current_limit) { | |
1925 | status = device_create_file(dev, &dev_attr_min_microamps); | |
1926 | if (status < 0) | |
1927 | return status; | |
1928 | status = device_create_file(dev, &dev_attr_max_microamps); | |
1929 | if (status < 0) | |
1930 | return status; | |
1931 | } | |
1932 | ||
1933 | /* suspend mode constraints need multiple supporting methods */ | |
1934 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
1935 | return status; | |
1936 | ||
1937 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
1938 | if (status < 0) | |
1939 | return status; | |
1940 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
1941 | if (status < 0) | |
1942 | return status; | |
1943 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
1944 | if (status < 0) | |
1945 | return status; | |
1946 | ||
1947 | if (ops->set_suspend_voltage) { | |
1948 | status = device_create_file(dev, | |
1949 | &dev_attr_suspend_standby_microvolts); | |
1950 | if (status < 0) | |
1951 | return status; | |
1952 | status = device_create_file(dev, | |
1953 | &dev_attr_suspend_mem_microvolts); | |
1954 | if (status < 0) | |
1955 | return status; | |
1956 | status = device_create_file(dev, | |
1957 | &dev_attr_suspend_disk_microvolts); | |
1958 | if (status < 0) | |
1959 | return status; | |
1960 | } | |
1961 | ||
1962 | if (ops->set_suspend_mode) { | |
1963 | status = device_create_file(dev, | |
1964 | &dev_attr_suspend_standby_mode); | |
1965 | if (status < 0) | |
1966 | return status; | |
1967 | status = device_create_file(dev, | |
1968 | &dev_attr_suspend_mem_mode); | |
1969 | if (status < 0) | |
1970 | return status; | |
1971 | status = device_create_file(dev, | |
1972 | &dev_attr_suspend_disk_mode); | |
1973 | if (status < 0) | |
1974 | return status; | |
1975 | } | |
1976 | ||
1977 | return status; | |
1978 | } | |
1979 | ||
414c70cb LG |
1980 | /** |
1981 | * regulator_register - register regulator | |
69279fb9 MB |
1982 | * @regulator_desc: regulator to register |
1983 | * @dev: struct device for the regulator | |
0527100f | 1984 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 1985 | * @driver_data: private regulator data |
414c70cb LG |
1986 | * |
1987 | * Called by regulator drivers to register a regulator. | |
1988 | * Returns 0 on success. | |
1989 | */ | |
1990 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
1991 | struct device *dev, struct regulator_init_data *init_data, |
1992 | void *driver_data) | |
414c70cb LG |
1993 | { |
1994 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
1995 | struct regulator_dev *rdev; | |
a5766f11 | 1996 | int ret, i; |
414c70cb LG |
1997 | |
1998 | if (regulator_desc == NULL) | |
1999 | return ERR_PTR(-EINVAL); | |
2000 | ||
2001 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2002 | return ERR_PTR(-EINVAL); | |
2003 | ||
2004 | if (!regulator_desc->type == REGULATOR_VOLTAGE && | |
2005 | !regulator_desc->type == REGULATOR_CURRENT) | |
2006 | return ERR_PTR(-EINVAL); | |
2007 | ||
46fabe1e MB |
2008 | if (!init_data) |
2009 | return ERR_PTR(-EINVAL); | |
2010 | ||
414c70cb LG |
2011 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2012 | if (rdev == NULL) | |
2013 | return ERR_PTR(-ENOMEM); | |
2014 | ||
2015 | mutex_lock(®ulator_list_mutex); | |
2016 | ||
2017 | mutex_init(&rdev->mutex); | |
a5766f11 | 2018 | rdev->reg_data = driver_data; |
414c70cb LG |
2019 | rdev->owner = regulator_desc->owner; |
2020 | rdev->desc = regulator_desc; | |
2021 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2022 | INIT_LIST_HEAD(&rdev->supply_list); | |
2023 | INIT_LIST_HEAD(&rdev->list); | |
2024 | INIT_LIST_HEAD(&rdev->slist); | |
2025 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2026 | ||
a5766f11 LG |
2027 | /* preform any regulator specific init */ |
2028 | if (init_data->regulator_init) { | |
2029 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2030 | if (ret < 0) |
2031 | goto clean; | |
a5766f11 LG |
2032 | } |
2033 | ||
a5766f11 | 2034 | /* register with sysfs */ |
414c70cb | 2035 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2036 | rdev->dev.parent = dev; |
812460a9 KS |
2037 | dev_set_name(&rdev->dev, "regulator.%d", |
2038 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2039 | ret = device_register(&rdev->dev); |
4fca9545 DB |
2040 | if (ret != 0) |
2041 | goto clean; | |
a5766f11 LG |
2042 | |
2043 | dev_set_drvdata(&rdev->dev, rdev); | |
2044 | ||
74f544c1 MR |
2045 | /* set regulator constraints */ |
2046 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2047 | if (ret < 0) | |
2048 | goto scrub; | |
2049 | ||
7ad68e2f DB |
2050 | /* add attributes supported by this regulator */ |
2051 | ret = add_regulator_attributes(rdev); | |
2052 | if (ret < 0) | |
2053 | goto scrub; | |
2054 | ||
a5766f11 LG |
2055 | /* set supply regulator if it exists */ |
2056 | if (init_data->supply_regulator_dev) { | |
2057 | ret = set_supply(rdev, | |
2058 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2059 | if (ret < 0) |
2060 | goto scrub; | |
a5766f11 LG |
2061 | } |
2062 | ||
2063 | /* add consumers devices */ | |
2064 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2065 | ret = set_consumer_device_supply(rdev, | |
2066 | init_data->consumer_supplies[i].dev, | |
2067 | init_data->consumer_supplies[i].supply); | |
2068 | if (ret < 0) { | |
2069 | for (--i; i >= 0; i--) | |
2070 | unset_consumer_device_supply(rdev, | |
2071 | init_data->consumer_supplies[i].dev); | |
4fca9545 | 2072 | goto scrub; |
a5766f11 | 2073 | } |
414c70cb | 2074 | } |
a5766f11 LG |
2075 | |
2076 | list_add(&rdev->list, ®ulator_list); | |
2077 | out: | |
414c70cb LG |
2078 | mutex_unlock(®ulator_list_mutex); |
2079 | return rdev; | |
4fca9545 DB |
2080 | |
2081 | scrub: | |
2082 | device_unregister(&rdev->dev); | |
2083 | clean: | |
2084 | kfree(rdev); | |
2085 | rdev = ERR_PTR(ret); | |
2086 | goto out; | |
414c70cb LG |
2087 | } |
2088 | EXPORT_SYMBOL_GPL(regulator_register); | |
2089 | ||
2090 | /** | |
2091 | * regulator_unregister - unregister regulator | |
69279fb9 | 2092 | * @rdev: regulator to unregister |
414c70cb LG |
2093 | * |
2094 | * Called by regulator drivers to unregister a regulator. | |
2095 | */ | |
2096 | void regulator_unregister(struct regulator_dev *rdev) | |
2097 | { | |
2098 | if (rdev == NULL) | |
2099 | return; | |
2100 | ||
2101 | mutex_lock(®ulator_list_mutex); | |
0f1d747b | 2102 | unset_regulator_supplies(rdev); |
414c70cb LG |
2103 | list_del(&rdev->list); |
2104 | if (rdev->supply) | |
2105 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2106 | device_unregister(&rdev->dev); | |
2107 | mutex_unlock(®ulator_list_mutex); | |
2108 | } | |
2109 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2110 | ||
414c70cb | 2111 | /** |
cf7bbcdf | 2112 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2113 | * @state: system suspend state |
2114 | * | |
2115 | * Configure each regulator with it's suspend operating parameters for state. | |
2116 | * This will usually be called by machine suspend code prior to supending. | |
2117 | */ | |
2118 | int regulator_suspend_prepare(suspend_state_t state) | |
2119 | { | |
2120 | struct regulator_dev *rdev; | |
2121 | int ret = 0; | |
2122 | ||
2123 | /* ON is handled by regulator active state */ | |
2124 | if (state == PM_SUSPEND_ON) | |
2125 | return -EINVAL; | |
2126 | ||
2127 | mutex_lock(®ulator_list_mutex); | |
2128 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2129 | ||
2130 | mutex_lock(&rdev->mutex); | |
2131 | ret = suspend_prepare(rdev, state); | |
2132 | mutex_unlock(&rdev->mutex); | |
2133 | ||
2134 | if (ret < 0) { | |
2135 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
2136 | __func__, rdev->desc->name); | |
2137 | goto out; | |
2138 | } | |
2139 | } | |
2140 | out: | |
2141 | mutex_unlock(®ulator_list_mutex); | |
2142 | return ret; | |
2143 | } | |
2144 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2145 | ||
ca725561 MB |
2146 | /** |
2147 | * regulator_has_full_constraints - the system has fully specified constraints | |
2148 | * | |
2149 | * Calling this function will cause the regulator API to disable all | |
2150 | * regulators which have a zero use count and don't have an always_on | |
2151 | * constraint in a late_initcall. | |
2152 | * | |
2153 | * The intention is that this will become the default behaviour in a | |
2154 | * future kernel release so users are encouraged to use this facility | |
2155 | * now. | |
2156 | */ | |
2157 | void regulator_has_full_constraints(void) | |
2158 | { | |
2159 | has_full_constraints = 1; | |
2160 | } | |
2161 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2162 | ||
414c70cb LG |
2163 | /** |
2164 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2165 | * @rdev: regulator |
414c70cb LG |
2166 | * |
2167 | * Get rdev regulator driver private data. This call can be used in the | |
2168 | * regulator driver context. | |
2169 | */ | |
2170 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2171 | { | |
2172 | return rdev->reg_data; | |
2173 | } | |
2174 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2175 | ||
2176 | /** | |
2177 | * regulator_get_drvdata - get regulator driver data | |
2178 | * @regulator: regulator | |
2179 | * | |
2180 | * Get regulator driver private data. This call can be used in the consumer | |
2181 | * driver context when non API regulator specific functions need to be called. | |
2182 | */ | |
2183 | void *regulator_get_drvdata(struct regulator *regulator) | |
2184 | { | |
2185 | return regulator->rdev->reg_data; | |
2186 | } | |
2187 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2188 | ||
2189 | /** | |
2190 | * regulator_set_drvdata - set regulator driver data | |
2191 | * @regulator: regulator | |
2192 | * @data: data | |
2193 | */ | |
2194 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2195 | { | |
2196 | regulator->rdev->reg_data = data; | |
2197 | } | |
2198 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2199 | ||
2200 | /** | |
2201 | * regulator_get_id - get regulator ID | |
69279fb9 | 2202 | * @rdev: regulator |
414c70cb LG |
2203 | */ |
2204 | int rdev_get_id(struct regulator_dev *rdev) | |
2205 | { | |
2206 | return rdev->desc->id; | |
2207 | } | |
2208 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2209 | ||
a5766f11 LG |
2210 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2211 | { | |
2212 | return &rdev->dev; | |
2213 | } | |
2214 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2215 | ||
2216 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2217 | { | |
2218 | return reg_init_data->driver_data; | |
2219 | } | |
2220 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2221 | ||
414c70cb LG |
2222 | static int __init regulator_init(void) |
2223 | { | |
2224 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); | |
2225 | return class_register(®ulator_class); | |
2226 | } | |
2227 | ||
2228 | /* init early to allow our consumers to complete system booting */ | |
2229 | core_initcall(regulator_init); | |
ca725561 MB |
2230 | |
2231 | static int __init regulator_init_complete(void) | |
2232 | { | |
2233 | struct regulator_dev *rdev; | |
2234 | struct regulator_ops *ops; | |
2235 | struct regulation_constraints *c; | |
2236 | int enabled, ret; | |
2237 | const char *name; | |
2238 | ||
2239 | mutex_lock(®ulator_list_mutex); | |
2240 | ||
2241 | /* If we have a full configuration then disable any regulators | |
2242 | * which are not in use or always_on. This will become the | |
2243 | * default behaviour in the future. | |
2244 | */ | |
2245 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2246 | ops = rdev->desc->ops; | |
2247 | c = rdev->constraints; | |
2248 | ||
2249 | if (c->name) | |
2250 | name = c->name; | |
2251 | else if (rdev->desc->name) | |
2252 | name = rdev->desc->name; | |
2253 | else | |
2254 | name = "regulator"; | |
2255 | ||
2256 | if (!ops->disable || c->always_on) | |
2257 | continue; | |
2258 | ||
2259 | mutex_lock(&rdev->mutex); | |
2260 | ||
2261 | if (rdev->use_count) | |
2262 | goto unlock; | |
2263 | ||
2264 | /* If we can't read the status assume it's on. */ | |
2265 | if (ops->is_enabled) | |
2266 | enabled = ops->is_enabled(rdev); | |
2267 | else | |
2268 | enabled = 1; | |
2269 | ||
2270 | if (!enabled) | |
2271 | goto unlock; | |
2272 | ||
2273 | if (has_full_constraints) { | |
2274 | /* We log since this may kill the system if it | |
2275 | * goes wrong. */ | |
2276 | printk(KERN_INFO "%s: disabling %s\n", | |
2277 | __func__, name); | |
2278 | ret = ops->disable(rdev); | |
2279 | if (ret != 0) { | |
2280 | printk(KERN_ERR | |
2281 | "%s: couldn't disable %s: %d\n", | |
2282 | __func__, name, ret); | |
2283 | } | |
2284 | } else { | |
2285 | /* The intention is that in future we will | |
2286 | * assume that full constraints are provided | |
2287 | * so warn even if we aren't going to do | |
2288 | * anything here. | |
2289 | */ | |
2290 | printk(KERN_WARNING | |
2291 | "%s: incomplete constraints, leaving %s on\n", | |
2292 | __func__, name); | |
2293 | } | |
2294 | ||
2295 | unlock: | |
2296 | mutex_unlock(&rdev->mutex); | |
2297 | } | |
2298 | ||
2299 | mutex_unlock(®ulator_list_mutex); | |
2300 | ||
2301 | return 0; | |
2302 | } | |
2303 | late_initcall(regulator_init_complete); |