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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; | |
40f9244f | 40 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 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 || | |
036de8ef DC |
543 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) |
544 | return; | |
414c70cb LG |
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 | ||
3e590918 MB |
706 | /* it's safe to autoconfigure fixed-voltage supplies |
707 | and the constraints are used by list_voltage. */ | |
4367cfdc | 708 | if (count == 1 && !cmin) { |
3e590918 | 709 | cmin = 1; |
4367cfdc | 710 | cmax = INT_MAX; |
3e590918 MB |
711 | constraints->min_uV = cmin; |
712 | constraints->max_uV = cmax; | |
4367cfdc DB |
713 | } |
714 | ||
3e2b9abd MB |
715 | /* voltage constraints are optional */ |
716 | if ((cmin == 0) && (cmax == 0)) | |
717 | goto out; | |
718 | ||
4367cfdc | 719 | /* else require explicit machine-level constraints */ |
3e2b9abd | 720 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
721 | pr_err("%s: %s '%s' voltage constraints\n", |
722 | __func__, "invalid", name); | |
723 | ret = -EINVAL; | |
724 | goto out; | |
725 | } | |
726 | ||
727 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
728 | for (i = 0; i < count; i++) { | |
729 | int value; | |
730 | ||
731 | value = ops->list_voltage(rdev, i); | |
732 | if (value <= 0) | |
733 | continue; | |
734 | ||
735 | /* maybe adjust [min_uV..max_uV] */ | |
736 | if (value >= cmin && value < min_uV) | |
737 | min_uV = value; | |
738 | if (value <= cmax && value > max_uV) | |
739 | max_uV = value; | |
740 | } | |
741 | ||
742 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
743 | if (max_uV < min_uV) { | |
744 | pr_err("%s: %s '%s' voltage constraints\n", | |
745 | __func__, "unsupportable", name); | |
746 | ret = -EINVAL; | |
747 | goto out; | |
748 | } | |
749 | ||
750 | /* use regulator's subset of machine constraints */ | |
751 | if (constraints->min_uV < min_uV) { | |
752 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
753 | __func__, name, "min_uV", | |
754 | constraints->min_uV, min_uV); | |
755 | constraints->min_uV = min_uV; | |
756 | } | |
757 | if (constraints->max_uV > max_uV) { | |
758 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
759 | __func__, name, "max_uV", | |
760 | constraints->max_uV, max_uV); | |
761 | constraints->max_uV = max_uV; | |
762 | } | |
763 | } | |
764 | ||
a5766f11 LG |
765 | rdev->constraints = constraints; |
766 | ||
767 | /* do we need to apply the constraint voltage */ | |
768 | if (rdev->constraints->apply_uV && | |
769 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
e5fda26c MB |
770 | ops->set_voltage) { |
771 | ret = ops->set_voltage(rdev, | |
a5766f11 LG |
772 | rdev->constraints->min_uV, rdev->constraints->max_uV); |
773 | if (ret < 0) { | |
e06f5b4f MB |
774 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", |
775 | __func__, | |
776 | rdev->constraints->min_uV, name); | |
a5766f11 LG |
777 | rdev->constraints = NULL; |
778 | goto out; | |
779 | } | |
780 | } | |
781 | ||
a5766f11 | 782 | /* do we need to setup our suspend state */ |
e06f5b4f | 783 | if (constraints->initial_state) { |
a5766f11 | 784 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
785 | if (ret < 0) { |
786 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
787 | __func__, name); | |
788 | rdev->constraints = NULL; | |
789 | goto out; | |
790 | } | |
791 | } | |
a5766f11 | 792 | |
a308466c MB |
793 | if (constraints->initial_mode) { |
794 | if (!ops->set_mode) { | |
795 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
796 | __func__, name); | |
797 | ret = -EINVAL; | |
798 | goto out; | |
799 | } | |
800 | ||
801 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
802 | if (ret < 0) { | |
803 | printk(KERN_ERR | |
804 | "%s: failed to set initial mode for %s: %d\n", | |
805 | __func__, name, ret); | |
806 | goto out; | |
807 | } | |
808 | } | |
809 | ||
cacf90f2 MB |
810 | /* If the constraints say the regulator should be on at this point |
811 | * and we have control then make sure it is enabled. | |
812 | */ | |
813 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
814 | ret = ops->enable(rdev); |
815 | if (ret < 0) { | |
816 | printk(KERN_ERR "%s: failed to enable %s\n", | |
817 | __func__, name); | |
818 | rdev->constraints = NULL; | |
819 | goto out; | |
820 | } | |
821 | } | |
822 | ||
a5766f11 LG |
823 | print_constraints(rdev); |
824 | out: | |
825 | return ret; | |
826 | } | |
827 | ||
828 | /** | |
829 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
830 | * @rdev: regulator name |
831 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
832 | * |
833 | * Called by platform initialisation code to set the supply regulator for this | |
834 | * regulator. This ensures that a regulators supply will also be enabled by the | |
835 | * core if it's child is enabled. | |
836 | */ | |
837 | static int set_supply(struct regulator_dev *rdev, | |
838 | struct regulator_dev *supply_rdev) | |
839 | { | |
840 | int err; | |
841 | ||
842 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
843 | "supply"); | |
844 | if (err) { | |
845 | printk(KERN_ERR | |
846 | "%s: could not add device link %s err %d\n", | |
847 | __func__, supply_rdev->dev.kobj.name, err); | |
848 | goto out; | |
849 | } | |
850 | rdev->supply = supply_rdev; | |
851 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
852 | out: | |
853 | return err; | |
854 | } | |
855 | ||
856 | /** | |
857 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
858 | * @rdev: regulator source |
859 | * @consumer_dev: device the supply applies to | |
40f9244f | 860 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 861 | * @supply: symbolic name for supply |
a5766f11 LG |
862 | * |
863 | * Allows platform initialisation code to map physical regulator | |
864 | * sources to symbolic names for supplies for use by devices. Devices | |
865 | * should use these symbolic names to request regulators, avoiding the | |
866 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
867 | * |
868 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
869 | */ |
870 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
871 | struct device *consumer_dev, const char *consumer_dev_name, |
872 | const char *supply) | |
a5766f11 LG |
873 | { |
874 | struct regulator_map *node; | |
9ed2099e | 875 | int has_dev; |
a5766f11 | 876 | |
40f9244f MB |
877 | if (consumer_dev && consumer_dev_name) |
878 | return -EINVAL; | |
879 | ||
880 | if (!consumer_dev_name && consumer_dev) | |
881 | consumer_dev_name = dev_name(consumer_dev); | |
882 | ||
a5766f11 LG |
883 | if (supply == NULL) |
884 | return -EINVAL; | |
885 | ||
9ed2099e MB |
886 | if (consumer_dev_name != NULL) |
887 | has_dev = 1; | |
888 | else | |
889 | has_dev = 0; | |
890 | ||
6001e13c | 891 | list_for_each_entry(node, ®ulator_map_list, list) { |
40f9244f | 892 | if (consumer_dev_name != node->dev_name) |
6001e13c DB |
893 | continue; |
894 | if (strcmp(node->supply, supply) != 0) | |
895 | continue; | |
896 | ||
897 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
898 | dev_name(&node->regulator->dev), | |
899 | node->regulator->desc->name, | |
900 | supply, | |
901 | dev_name(&rdev->dev), rdev->desc->name); | |
902 | return -EBUSY; | |
903 | } | |
904 | ||
9ed2099e | 905 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
906 | if (node == NULL) |
907 | return -ENOMEM; | |
908 | ||
909 | node->regulator = rdev; | |
a5766f11 LG |
910 | node->supply = supply; |
911 | ||
9ed2099e MB |
912 | if (has_dev) { |
913 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
914 | if (node->dev_name == NULL) { | |
915 | kfree(node); | |
916 | return -ENOMEM; | |
917 | } | |
40f9244f MB |
918 | } |
919 | ||
a5766f11 LG |
920 | list_add(&node->list, ®ulator_map_list); |
921 | return 0; | |
922 | } | |
923 | ||
924 | static void unset_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f | 925 | const char *consumer_dev_name, struct device *consumer_dev) |
a5766f11 LG |
926 | { |
927 | struct regulator_map *node, *n; | |
928 | ||
40f9244f MB |
929 | if (consumer_dev && !consumer_dev_name) |
930 | consumer_dev_name = dev_name(consumer_dev); | |
931 | ||
a5766f11 | 932 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { |
40f9244f MB |
933 | if (rdev != node->regulator) |
934 | continue; | |
935 | ||
936 | if (consumer_dev_name && node->dev_name && | |
937 | strcmp(consumer_dev_name, node->dev_name)) | |
938 | continue; | |
939 | ||
940 | list_del(&node->list); | |
941 | kfree(node->dev_name); | |
942 | kfree(node); | |
943 | return; | |
a5766f11 LG |
944 | } |
945 | } | |
946 | ||
0f1d747b MR |
947 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
948 | { | |
949 | struct regulator_map *node, *n; | |
950 | ||
951 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
952 | if (rdev == node->regulator) { | |
953 | list_del(&node->list); | |
40f9244f | 954 | kfree(node->dev_name); |
0f1d747b MR |
955 | kfree(node); |
956 | return; | |
957 | } | |
958 | } | |
959 | } | |
960 | ||
414c70cb LG |
961 | #define REG_STR_SIZE 32 |
962 | ||
963 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
964 | struct device *dev, | |
965 | const char *supply_name) | |
966 | { | |
967 | struct regulator *regulator; | |
968 | char buf[REG_STR_SIZE]; | |
969 | int err, size; | |
970 | ||
971 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
972 | if (regulator == NULL) | |
973 | return NULL; | |
974 | ||
975 | mutex_lock(&rdev->mutex); | |
976 | regulator->rdev = rdev; | |
977 | list_add(®ulator->list, &rdev->consumer_list); | |
978 | ||
979 | if (dev) { | |
980 | /* create a 'requested_microamps_name' sysfs entry */ | |
981 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
982 | supply_name); | |
983 | if (size >= REG_STR_SIZE) | |
984 | goto overflow_err; | |
985 | ||
986 | regulator->dev = dev; | |
987 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); | |
988 | if (regulator->dev_attr.attr.name == NULL) | |
989 | goto attr_name_err; | |
990 | ||
991 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
992 | regulator->dev_attr.attr.mode = 0444; | |
993 | regulator->dev_attr.show = device_requested_uA_show; | |
994 | err = device_create_file(dev, ®ulator->dev_attr); | |
995 | if (err < 0) { | |
996 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
997 | " load sysfs\n", __func__); | |
998 | goto attr_name_err; | |
999 | } | |
1000 | ||
1001 | /* also add a link to the device sysfs entry */ | |
1002 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1003 | dev->kobj.name, supply_name); | |
1004 | if (size >= REG_STR_SIZE) | |
1005 | goto attr_err; | |
1006 | ||
1007 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1008 | if (regulator->supply_name == NULL) | |
1009 | goto attr_err; | |
1010 | ||
1011 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1012 | buf); | |
1013 | if (err) { | |
1014 | printk(KERN_WARNING | |
1015 | "%s: could not add device link %s err %d\n", | |
1016 | __func__, dev->kobj.name, err); | |
1017 | device_remove_file(dev, ®ulator->dev_attr); | |
1018 | goto link_name_err; | |
1019 | } | |
1020 | } | |
1021 | mutex_unlock(&rdev->mutex); | |
1022 | return regulator; | |
1023 | link_name_err: | |
1024 | kfree(regulator->supply_name); | |
1025 | attr_err: | |
1026 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1027 | attr_name_err: | |
1028 | kfree(regulator->dev_attr.attr.name); | |
1029 | overflow_err: | |
1030 | list_del(®ulator->list); | |
1031 | kfree(regulator); | |
1032 | mutex_unlock(&rdev->mutex); | |
1033 | return NULL; | |
1034 | } | |
1035 | ||
5ffbd136 MB |
1036 | /* Internal regulator request function */ |
1037 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1038 | int exclusive) | |
414c70cb LG |
1039 | { |
1040 | struct regulator_dev *rdev; | |
1041 | struct regulator_map *map; | |
1042 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1043 | const char *devname = NULL; |
5ffbd136 | 1044 | int ret; |
414c70cb LG |
1045 | |
1046 | if (id == NULL) { | |
1047 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1048 | return regulator; | |
1049 | } | |
1050 | ||
40f9244f MB |
1051 | if (dev) |
1052 | devname = dev_name(dev); | |
1053 | ||
414c70cb LG |
1054 | mutex_lock(®ulator_list_mutex); |
1055 | ||
1056 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1057 | /* If the mapping has a device set up it must match */ |
1058 | if (map->dev_name && | |
1059 | (!devname || strcmp(map->dev_name, devname))) | |
1060 | continue; | |
1061 | ||
1062 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1063 | rdev = map->regulator; |
414c70cb | 1064 | goto found; |
a5766f11 | 1065 | } |
414c70cb | 1066 | } |
414c70cb LG |
1067 | mutex_unlock(®ulator_list_mutex); |
1068 | return regulator; | |
1069 | ||
1070 | found: | |
5ffbd136 MB |
1071 | if (rdev->exclusive) { |
1072 | regulator = ERR_PTR(-EPERM); | |
1073 | goto out; | |
1074 | } | |
1075 | ||
1076 | if (exclusive && rdev->open_count) { | |
1077 | regulator = ERR_PTR(-EBUSY); | |
1078 | goto out; | |
1079 | } | |
1080 | ||
a5766f11 LG |
1081 | if (!try_module_get(rdev->owner)) |
1082 | goto out; | |
1083 | ||
414c70cb LG |
1084 | regulator = create_regulator(rdev, dev, id); |
1085 | if (regulator == NULL) { | |
1086 | regulator = ERR_PTR(-ENOMEM); | |
1087 | module_put(rdev->owner); | |
1088 | } | |
1089 | ||
5ffbd136 MB |
1090 | rdev->open_count++; |
1091 | if (exclusive) { | |
1092 | rdev->exclusive = 1; | |
1093 | ||
1094 | ret = _regulator_is_enabled(rdev); | |
1095 | if (ret > 0) | |
1096 | rdev->use_count = 1; | |
1097 | else | |
1098 | rdev->use_count = 0; | |
1099 | } | |
1100 | ||
a5766f11 | 1101 | out: |
414c70cb | 1102 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1103 | |
414c70cb LG |
1104 | return regulator; |
1105 | } | |
5ffbd136 MB |
1106 | |
1107 | /** | |
1108 | * regulator_get - lookup and obtain a reference to a regulator. | |
1109 | * @dev: device for regulator "consumer" | |
1110 | * @id: Supply name or regulator ID. | |
1111 | * | |
1112 | * Returns a struct regulator corresponding to the regulator producer, | |
1113 | * or IS_ERR() condition containing errno. | |
1114 | * | |
1115 | * Use of supply names configured via regulator_set_device_supply() is | |
1116 | * strongly encouraged. It is recommended that the supply name used | |
1117 | * should match the name used for the supply and/or the relevant | |
1118 | * device pins in the datasheet. | |
1119 | */ | |
1120 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1121 | { | |
1122 | return _regulator_get(dev, id, 0); | |
1123 | } | |
414c70cb LG |
1124 | EXPORT_SYMBOL_GPL(regulator_get); |
1125 | ||
5ffbd136 MB |
1126 | /** |
1127 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1128 | * @dev: device for regulator "consumer" | |
1129 | * @id: Supply name or regulator ID. | |
1130 | * | |
1131 | * Returns a struct regulator corresponding to the regulator producer, | |
1132 | * or IS_ERR() condition containing errno. Other consumers will be | |
1133 | * unable to obtain this reference is held and the use count for the | |
1134 | * regulator will be initialised to reflect the current state of the | |
1135 | * regulator. | |
1136 | * | |
1137 | * This is intended for use by consumers which cannot tolerate shared | |
1138 | * use of the regulator such as those which need to force the | |
1139 | * regulator off for correct operation of the hardware they are | |
1140 | * controlling. | |
1141 | * | |
1142 | * Use of supply names configured via regulator_set_device_supply() is | |
1143 | * strongly encouraged. It is recommended that the supply name used | |
1144 | * should match the name used for the supply and/or the relevant | |
1145 | * device pins in the datasheet. | |
1146 | */ | |
1147 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1148 | { | |
1149 | return _regulator_get(dev, id, 1); | |
1150 | } | |
1151 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1152 | ||
414c70cb LG |
1153 | /** |
1154 | * regulator_put - "free" the regulator source | |
1155 | * @regulator: regulator source | |
1156 | * | |
1157 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1158 | * regulator source are balanced by regulator_disable calls prior to calling | |
1159 | * this function. | |
1160 | */ | |
1161 | void regulator_put(struct regulator *regulator) | |
1162 | { | |
1163 | struct regulator_dev *rdev; | |
1164 | ||
1165 | if (regulator == NULL || IS_ERR(regulator)) | |
1166 | return; | |
1167 | ||
414c70cb LG |
1168 | mutex_lock(®ulator_list_mutex); |
1169 | rdev = regulator->rdev; | |
1170 | ||
1171 | /* remove any sysfs entries */ | |
1172 | if (regulator->dev) { | |
1173 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1174 | kfree(regulator->supply_name); | |
1175 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1176 | kfree(regulator->dev_attr.attr.name); | |
1177 | } | |
1178 | list_del(®ulator->list); | |
1179 | kfree(regulator); | |
1180 | ||
5ffbd136 MB |
1181 | rdev->open_count--; |
1182 | rdev->exclusive = 0; | |
1183 | ||
414c70cb LG |
1184 | module_put(rdev->owner); |
1185 | mutex_unlock(®ulator_list_mutex); | |
1186 | } | |
1187 | EXPORT_SYMBOL_GPL(regulator_put); | |
1188 | ||
1189 | /* locks held by regulator_enable() */ | |
1190 | static int _regulator_enable(struct regulator_dev *rdev) | |
1191 | { | |
1192 | int ret = -EINVAL; | |
1193 | ||
1194 | if (!rdev->constraints) { | |
1195 | printk(KERN_ERR "%s: %s has no constraints\n", | |
1196 | __func__, rdev->desc->name); | |
1197 | return ret; | |
1198 | } | |
1199 | ||
1200 | /* do we need to enable the supply regulator first */ | |
1201 | if (rdev->supply) { | |
1202 | ret = _regulator_enable(rdev->supply); | |
1203 | if (ret < 0) { | |
1204 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1205 | __func__, rdev->desc->name, ret); | |
1206 | return ret; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | /* check voltage and requested load before enabling */ | |
1211 | if (rdev->desc->ops->enable) { | |
1212 | ||
1213 | if (rdev->constraints && | |
1214 | (rdev->constraints->valid_ops_mask & | |
1215 | REGULATOR_CHANGE_DRMS)) | |
1216 | drms_uA_update(rdev); | |
1217 | ||
1218 | ret = rdev->desc->ops->enable(rdev); | |
1219 | if (ret < 0) { | |
1220 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1221 | __func__, rdev->desc->name, ret); | |
1222 | return ret; | |
1223 | } | |
1224 | rdev->use_count++; | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | return ret; | |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * regulator_enable - enable regulator output | |
1233 | * @regulator: regulator source | |
1234 | * | |
cf7bbcdf MB |
1235 | * Request that the regulator be enabled with the regulator output at |
1236 | * the predefined voltage or current value. Calls to regulator_enable() | |
1237 | * must be balanced with calls to regulator_disable(). | |
1238 | * | |
414c70cb | 1239 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1240 | * hardwired in the regulator. |
414c70cb LG |
1241 | */ |
1242 | int regulator_enable(struct regulator *regulator) | |
1243 | { | |
412aec61 DB |
1244 | struct regulator_dev *rdev = regulator->rdev; |
1245 | int ret = 0; | |
414c70cb | 1246 | |
412aec61 | 1247 | mutex_lock(&rdev->mutex); |
cd94b505 | 1248 | ret = _regulator_enable(rdev); |
412aec61 | 1249 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1250 | return ret; |
1251 | } | |
1252 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1253 | ||
1254 | /* locks held by regulator_disable() */ | |
1255 | static int _regulator_disable(struct regulator_dev *rdev) | |
1256 | { | |
1257 | int ret = 0; | |
1258 | ||
cd94b505 DB |
1259 | if (WARN(rdev->use_count <= 0, |
1260 | "unbalanced disables for %s\n", | |
1261 | rdev->desc->name)) | |
1262 | return -EIO; | |
1263 | ||
414c70cb LG |
1264 | /* are we the last user and permitted to disable ? */ |
1265 | if (rdev->use_count == 1 && !rdev->constraints->always_on) { | |
1266 | ||
1267 | /* we are last user */ | |
1268 | if (rdev->desc->ops->disable) { | |
1269 | ret = rdev->desc->ops->disable(rdev); | |
1270 | if (ret < 0) { | |
1271 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1272 | __func__, rdev->desc->name); | |
1273 | return ret; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* decrease our supplies ref count and disable if required */ | |
1278 | if (rdev->supply) | |
1279 | _regulator_disable(rdev->supply); | |
1280 | ||
1281 | rdev->use_count = 0; | |
1282 | } else if (rdev->use_count > 1) { | |
1283 | ||
1284 | if (rdev->constraints && | |
1285 | (rdev->constraints->valid_ops_mask & | |
1286 | REGULATOR_CHANGE_DRMS)) | |
1287 | drms_uA_update(rdev); | |
1288 | ||
1289 | rdev->use_count--; | |
1290 | } | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | /** | |
1295 | * regulator_disable - disable regulator output | |
1296 | * @regulator: regulator source | |
1297 | * | |
cf7bbcdf MB |
1298 | * Disable the regulator output voltage or current. Calls to |
1299 | * regulator_enable() must be balanced with calls to | |
1300 | * regulator_disable(). | |
69279fb9 | 1301 | * |
414c70cb | 1302 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1303 | * devices have it enabled, the regulator device supports disabling and |
1304 | * machine constraints permit this operation. | |
414c70cb LG |
1305 | */ |
1306 | int regulator_disable(struct regulator *regulator) | |
1307 | { | |
412aec61 DB |
1308 | struct regulator_dev *rdev = regulator->rdev; |
1309 | int ret = 0; | |
414c70cb | 1310 | |
412aec61 | 1311 | mutex_lock(&rdev->mutex); |
cd94b505 | 1312 | ret = _regulator_disable(rdev); |
412aec61 | 1313 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1314 | return ret; |
1315 | } | |
1316 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1317 | ||
1318 | /* locks held by regulator_force_disable() */ | |
1319 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1320 | { | |
1321 | int ret = 0; | |
1322 | ||
1323 | /* force disable */ | |
1324 | if (rdev->desc->ops->disable) { | |
1325 | /* ah well, who wants to live forever... */ | |
1326 | ret = rdev->desc->ops->disable(rdev); | |
1327 | if (ret < 0) { | |
1328 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1329 | __func__, rdev->desc->name); | |
1330 | return ret; | |
1331 | } | |
1332 | /* notify other consumers that power has been forced off */ | |
1333 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, | |
1334 | NULL); | |
1335 | } | |
1336 | ||
1337 | /* decrease our supplies ref count and disable if required */ | |
1338 | if (rdev->supply) | |
1339 | _regulator_disable(rdev->supply); | |
1340 | ||
1341 | rdev->use_count = 0; | |
1342 | return ret; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * regulator_force_disable - force disable regulator output | |
1347 | * @regulator: regulator source | |
1348 | * | |
1349 | * Forcibly disable the regulator output voltage or current. | |
1350 | * NOTE: this *will* disable the regulator output even if other consumer | |
1351 | * devices have it enabled. This should be used for situations when device | |
1352 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1353 | */ | |
1354 | int regulator_force_disable(struct regulator *regulator) | |
1355 | { | |
1356 | int ret; | |
1357 | ||
1358 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1359 | regulator->uA_load = 0; |
1360 | ret = _regulator_force_disable(regulator->rdev); | |
1361 | mutex_unlock(®ulator->rdev->mutex); | |
1362 | return ret; | |
1363 | } | |
1364 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1365 | ||
1366 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1367 | { | |
1368 | int ret; | |
1369 | ||
1370 | mutex_lock(&rdev->mutex); | |
1371 | ||
1372 | /* sanity check */ | |
1373 | if (!rdev->desc->ops->is_enabled) { | |
1374 | ret = -EINVAL; | |
1375 | goto out; | |
1376 | } | |
1377 | ||
1378 | ret = rdev->desc->ops->is_enabled(rdev); | |
1379 | out: | |
1380 | mutex_unlock(&rdev->mutex); | |
1381 | return ret; | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * regulator_is_enabled - is the regulator output enabled | |
1386 | * @regulator: regulator source | |
1387 | * | |
412aec61 DB |
1388 | * Returns positive if the regulator driver backing the source/client |
1389 | * has requested that the device be enabled, zero if it hasn't, else a | |
1390 | * negative errno code. | |
1391 | * | |
1392 | * Note that the device backing this regulator handle can have multiple | |
1393 | * users, so it might be enabled even if regulator_enable() was never | |
1394 | * called for this particular source. | |
414c70cb LG |
1395 | */ |
1396 | int regulator_is_enabled(struct regulator *regulator) | |
1397 | { | |
1398 | return _regulator_is_enabled(regulator->rdev); | |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1401 | ||
4367cfdc DB |
1402 | /** |
1403 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1404 | * @regulator: regulator source | |
1405 | * | |
1406 | * Returns number of selectors, or negative errno. Selectors are | |
1407 | * numbered starting at zero, and typically correspond to bitfields | |
1408 | * in hardware registers. | |
1409 | */ | |
1410 | int regulator_count_voltages(struct regulator *regulator) | |
1411 | { | |
1412 | struct regulator_dev *rdev = regulator->rdev; | |
1413 | ||
1414 | return rdev->desc->n_voltages ? : -EINVAL; | |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1417 | ||
1418 | /** | |
1419 | * regulator_list_voltage - enumerate supported voltages | |
1420 | * @regulator: regulator source | |
1421 | * @selector: identify voltage to list | |
1422 | * Context: can sleep | |
1423 | * | |
1424 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
1425 | * zero if this selector code can't be used on this sytem, or a | |
1426 | * negative errno. | |
1427 | */ | |
1428 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1429 | { | |
1430 | struct regulator_dev *rdev = regulator->rdev; | |
1431 | struct regulator_ops *ops = rdev->desc->ops; | |
1432 | int ret; | |
1433 | ||
1434 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1435 | return -EINVAL; | |
1436 | ||
1437 | mutex_lock(&rdev->mutex); | |
1438 | ret = ops->list_voltage(rdev, selector); | |
1439 | mutex_unlock(&rdev->mutex); | |
1440 | ||
1441 | if (ret > 0) { | |
1442 | if (ret < rdev->constraints->min_uV) | |
1443 | ret = 0; | |
1444 | else if (ret > rdev->constraints->max_uV) | |
1445 | ret = 0; | |
1446 | } | |
1447 | ||
1448 | return ret; | |
1449 | } | |
1450 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1451 | ||
a7a1ad90 MB |
1452 | /** |
1453 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1454 | * | |
1455 | * @regulator: Regulator to check. | |
1456 | * @min_uV: Minimum required voltage in uV. | |
1457 | * @max_uV: Maximum required voltage in uV. | |
1458 | * | |
1459 | * Returns a boolean or a negative error code. | |
1460 | */ | |
1461 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1462 | int min_uV, int max_uV) | |
1463 | { | |
1464 | int i, voltages, ret; | |
1465 | ||
1466 | ret = regulator_count_voltages(regulator); | |
1467 | if (ret < 0) | |
1468 | return ret; | |
1469 | voltages = ret; | |
1470 | ||
1471 | for (i = 0; i < voltages; i++) { | |
1472 | ret = regulator_list_voltage(regulator, i); | |
1473 | ||
1474 | if (ret >= min_uV && ret <= max_uV) | |
1475 | return 1; | |
1476 | } | |
1477 | ||
1478 | return 0; | |
1479 | } | |
1480 | ||
414c70cb LG |
1481 | /** |
1482 | * regulator_set_voltage - set regulator output voltage | |
1483 | * @regulator: regulator source | |
1484 | * @min_uV: Minimum required voltage in uV | |
1485 | * @max_uV: Maximum acceptable voltage in uV | |
1486 | * | |
1487 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1488 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1489 | * | |
1490 | * If the regulator is enabled then the voltage will change to the new value | |
1491 | * immediately otherwise if the regulator is disabled the regulator will | |
1492 | * output at the new voltage when enabled. | |
1493 | * | |
1494 | * NOTE: If the regulator is shared between several devices then the lowest | |
1495 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1496 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1497 | * calling this function otherwise this call will fail. |
1498 | */ | |
1499 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1500 | { | |
1501 | struct regulator_dev *rdev = regulator->rdev; | |
1502 | int ret; | |
1503 | ||
1504 | mutex_lock(&rdev->mutex); | |
1505 | ||
1506 | /* sanity check */ | |
1507 | if (!rdev->desc->ops->set_voltage) { | |
1508 | ret = -EINVAL; | |
1509 | goto out; | |
1510 | } | |
1511 | ||
1512 | /* constraints check */ | |
1513 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1514 | if (ret < 0) | |
1515 | goto out; | |
1516 | regulator->min_uV = min_uV; | |
1517 | regulator->max_uV = max_uV; | |
1518 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1519 | ||
1520 | out: | |
b136fb44 | 1521 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1522 | mutex_unlock(&rdev->mutex); |
1523 | return ret; | |
1524 | } | |
1525 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1526 | ||
1527 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1528 | { | |
1529 | /* sanity check */ | |
1530 | if (rdev->desc->ops->get_voltage) | |
1531 | return rdev->desc->ops->get_voltage(rdev); | |
1532 | else | |
1533 | return -EINVAL; | |
1534 | } | |
1535 | ||
1536 | /** | |
1537 | * regulator_get_voltage - get regulator output voltage | |
1538 | * @regulator: regulator source | |
1539 | * | |
1540 | * This returns the current regulator voltage in uV. | |
1541 | * | |
1542 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1543 | * function should not be used to determine regulator state. | |
1544 | */ | |
1545 | int regulator_get_voltage(struct regulator *regulator) | |
1546 | { | |
1547 | int ret; | |
1548 | ||
1549 | mutex_lock(®ulator->rdev->mutex); | |
1550 | ||
1551 | ret = _regulator_get_voltage(regulator->rdev); | |
1552 | ||
1553 | mutex_unlock(®ulator->rdev->mutex); | |
1554 | ||
1555 | return ret; | |
1556 | } | |
1557 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1558 | ||
1559 | /** | |
1560 | * regulator_set_current_limit - set regulator output current limit | |
1561 | * @regulator: regulator source | |
1562 | * @min_uA: Minimuum supported current in uA | |
1563 | * @max_uA: Maximum supported current in uA | |
1564 | * | |
1565 | * Sets current sink to the desired output current. This can be set during | |
1566 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1567 | * | |
1568 | * If the regulator is enabled then the current will change to the new value | |
1569 | * immediately otherwise if the regulator is disabled the regulator will | |
1570 | * output at the new current when enabled. | |
1571 | * | |
1572 | * NOTE: Regulator system constraints must be set for this regulator before | |
1573 | * calling this function otherwise this call will fail. | |
1574 | */ | |
1575 | int regulator_set_current_limit(struct regulator *regulator, | |
1576 | int min_uA, int max_uA) | |
1577 | { | |
1578 | struct regulator_dev *rdev = regulator->rdev; | |
1579 | int ret; | |
1580 | ||
1581 | mutex_lock(&rdev->mutex); | |
1582 | ||
1583 | /* sanity check */ | |
1584 | if (!rdev->desc->ops->set_current_limit) { | |
1585 | ret = -EINVAL; | |
1586 | goto out; | |
1587 | } | |
1588 | ||
1589 | /* constraints check */ | |
1590 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1591 | if (ret < 0) | |
1592 | goto out; | |
1593 | ||
1594 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1595 | out: | |
1596 | mutex_unlock(&rdev->mutex); | |
1597 | return ret; | |
1598 | } | |
1599 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1600 | ||
1601 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1602 | { | |
1603 | int ret; | |
1604 | ||
1605 | mutex_lock(&rdev->mutex); | |
1606 | ||
1607 | /* sanity check */ | |
1608 | if (!rdev->desc->ops->get_current_limit) { | |
1609 | ret = -EINVAL; | |
1610 | goto out; | |
1611 | } | |
1612 | ||
1613 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1614 | out: | |
1615 | mutex_unlock(&rdev->mutex); | |
1616 | return ret; | |
1617 | } | |
1618 | ||
1619 | /** | |
1620 | * regulator_get_current_limit - get regulator output current | |
1621 | * @regulator: regulator source | |
1622 | * | |
1623 | * This returns the current supplied by the specified current sink in uA. | |
1624 | * | |
1625 | * NOTE: If the regulator is disabled it will return the current value. This | |
1626 | * function should not be used to determine regulator state. | |
1627 | */ | |
1628 | int regulator_get_current_limit(struct regulator *regulator) | |
1629 | { | |
1630 | return _regulator_get_current_limit(regulator->rdev); | |
1631 | } | |
1632 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1633 | ||
1634 | /** | |
1635 | * regulator_set_mode - set regulator operating mode | |
1636 | * @regulator: regulator source | |
1637 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1638 | * | |
1639 | * Set regulator operating mode to increase regulator efficiency or improve | |
1640 | * regulation performance. | |
1641 | * | |
1642 | * NOTE: Regulator system constraints must be set for this regulator before | |
1643 | * calling this function otherwise this call will fail. | |
1644 | */ | |
1645 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1646 | { | |
1647 | struct regulator_dev *rdev = regulator->rdev; | |
1648 | int ret; | |
1649 | ||
1650 | mutex_lock(&rdev->mutex); | |
1651 | ||
1652 | /* sanity check */ | |
1653 | if (!rdev->desc->ops->set_mode) { | |
1654 | ret = -EINVAL; | |
1655 | goto out; | |
1656 | } | |
1657 | ||
1658 | /* constraints check */ | |
1659 | ret = regulator_check_mode(rdev, mode); | |
1660 | if (ret < 0) | |
1661 | goto out; | |
1662 | ||
1663 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1664 | out: | |
1665 | mutex_unlock(&rdev->mutex); | |
1666 | return ret; | |
1667 | } | |
1668 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1669 | ||
1670 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1671 | { | |
1672 | int ret; | |
1673 | ||
1674 | mutex_lock(&rdev->mutex); | |
1675 | ||
1676 | /* sanity check */ | |
1677 | if (!rdev->desc->ops->get_mode) { | |
1678 | ret = -EINVAL; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | ret = rdev->desc->ops->get_mode(rdev); | |
1683 | out: | |
1684 | mutex_unlock(&rdev->mutex); | |
1685 | return ret; | |
1686 | } | |
1687 | ||
1688 | /** | |
1689 | * regulator_get_mode - get regulator operating mode | |
1690 | * @regulator: regulator source | |
1691 | * | |
1692 | * Get the current regulator operating mode. | |
1693 | */ | |
1694 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1695 | { | |
1696 | return _regulator_get_mode(regulator->rdev); | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1699 | ||
1700 | /** | |
1701 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1702 | * @regulator: regulator source | |
1703 | * @uA_load: load current | |
1704 | * | |
1705 | * Notifies the regulator core of a new device load. This is then used by | |
1706 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1707 | * operating mode for the new regulator loading. | |
1708 | * | |
1709 | * Consumer devices notify their supply regulator of the maximum power | |
1710 | * they will require (can be taken from device datasheet in the power | |
1711 | * consumption tables) when they change operational status and hence power | |
1712 | * state. Examples of operational state changes that can affect power | |
1713 | * consumption are :- | |
1714 | * | |
1715 | * o Device is opened / closed. | |
1716 | * o Device I/O is about to begin or has just finished. | |
1717 | * o Device is idling in between work. | |
1718 | * | |
1719 | * This information is also exported via sysfs to userspace. | |
1720 | * | |
1721 | * DRMS will sum the total requested load on the regulator and change | |
1722 | * to the most efficient operating mode if platform constraints allow. | |
1723 | * | |
1724 | * Returns the new regulator mode or error. | |
1725 | */ | |
1726 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1727 | { | |
1728 | struct regulator_dev *rdev = regulator->rdev; | |
1729 | struct regulator *consumer; | |
1730 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1731 | unsigned int mode; | |
1732 | ||
1733 | mutex_lock(&rdev->mutex); | |
1734 | ||
1735 | regulator->uA_load = uA_load; | |
1736 | ret = regulator_check_drms(rdev); | |
1737 | if (ret < 0) | |
1738 | goto out; | |
1739 | ret = -EINVAL; | |
1740 | ||
1741 | /* sanity check */ | |
1742 | if (!rdev->desc->ops->get_optimum_mode) | |
1743 | goto out; | |
1744 | ||
1745 | /* get output voltage */ | |
1746 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1747 | if (output_uV <= 0) { | |
1748 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1749 | __func__, rdev->desc->name); | |
1750 | goto out; | |
1751 | } | |
1752 | ||
1753 | /* get input voltage */ | |
1754 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1755 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1756 | else | |
1757 | input_uV = rdev->constraints->input_uV; | |
1758 | if (input_uV <= 0) { | |
1759 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1760 | __func__, rdev->desc->name); | |
1761 | goto out; | |
1762 | } | |
1763 | ||
1764 | /* calc total requested load for this regulator */ | |
1765 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
1766 | total_uA_load += consumer->uA_load; | |
1767 | ||
1768 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1769 | input_uV, output_uV, | |
1770 | total_uA_load); | |
e573520b DB |
1771 | ret = regulator_check_mode(rdev, mode); |
1772 | if (ret < 0) { | |
414c70cb LG |
1773 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1774 | " %d uA %d -> %d uV\n", __func__, rdev->desc->name, | |
1775 | total_uA_load, input_uV, output_uV); | |
1776 | goto out; | |
1777 | } | |
1778 | ||
1779 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1780 | if (ret < 0) { |
414c70cb LG |
1781 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1782 | __func__, mode, rdev->desc->name); | |
1783 | goto out; | |
1784 | } | |
1785 | ret = mode; | |
1786 | out: | |
1787 | mutex_unlock(&rdev->mutex); | |
1788 | return ret; | |
1789 | } | |
1790 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1791 | ||
1792 | /** | |
1793 | * regulator_register_notifier - register regulator event notifier | |
1794 | * @regulator: regulator source | |
69279fb9 | 1795 | * @nb: notifier block |
414c70cb LG |
1796 | * |
1797 | * Register notifier block to receive regulator events. | |
1798 | */ | |
1799 | int regulator_register_notifier(struct regulator *regulator, | |
1800 | struct notifier_block *nb) | |
1801 | { | |
1802 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1803 | nb); | |
1804 | } | |
1805 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1806 | ||
1807 | /** | |
1808 | * regulator_unregister_notifier - unregister regulator event notifier | |
1809 | * @regulator: regulator source | |
69279fb9 | 1810 | * @nb: notifier block |
414c70cb LG |
1811 | * |
1812 | * Unregister regulator event notifier block. | |
1813 | */ | |
1814 | int regulator_unregister_notifier(struct regulator *regulator, | |
1815 | struct notifier_block *nb) | |
1816 | { | |
1817 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1818 | nb); | |
1819 | } | |
1820 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1821 | ||
b136fb44 JC |
1822 | /* notify regulator consumers and downstream regulator consumers. |
1823 | * Note mutex must be held by caller. | |
1824 | */ | |
414c70cb LG |
1825 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1826 | unsigned long event, void *data) | |
1827 | { | |
1828 | struct regulator_dev *_rdev; | |
1829 | ||
1830 | /* call rdev chain first */ | |
414c70cb | 1831 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1832 | |
1833 | /* now notify regulator we supply */ | |
b136fb44 JC |
1834 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
1835 | mutex_lock(&_rdev->mutex); | |
1836 | _notifier_call_chain(_rdev, event, data); | |
1837 | mutex_unlock(&_rdev->mutex); | |
1838 | } | |
414c70cb LG |
1839 | } |
1840 | ||
1841 | /** | |
1842 | * regulator_bulk_get - get multiple regulator consumers | |
1843 | * | |
1844 | * @dev: Device to supply | |
1845 | * @num_consumers: Number of consumers to register | |
1846 | * @consumers: Configuration of consumers; clients are stored here. | |
1847 | * | |
1848 | * @return 0 on success, an errno on failure. | |
1849 | * | |
1850 | * This helper function allows drivers to get several regulator | |
1851 | * consumers in one operation. If any of the regulators cannot be | |
1852 | * acquired then any regulators that were allocated will be freed | |
1853 | * before returning to the caller. | |
1854 | */ | |
1855 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1856 | struct regulator_bulk_data *consumers) | |
1857 | { | |
1858 | int i; | |
1859 | int ret; | |
1860 | ||
1861 | for (i = 0; i < num_consumers; i++) | |
1862 | consumers[i].consumer = NULL; | |
1863 | ||
1864 | for (i = 0; i < num_consumers; i++) { | |
1865 | consumers[i].consumer = regulator_get(dev, | |
1866 | consumers[i].supply); | |
1867 | if (IS_ERR(consumers[i].consumer)) { | |
1868 | dev_err(dev, "Failed to get supply '%s'\n", | |
1869 | consumers[i].supply); | |
1870 | ret = PTR_ERR(consumers[i].consumer); | |
1871 | consumers[i].consumer = NULL; | |
1872 | goto err; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | return 0; | |
1877 | ||
1878 | err: | |
1879 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1880 | regulator_put(consumers[i].consumer); | |
1881 | ||
1882 | return ret; | |
1883 | } | |
1884 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1885 | ||
1886 | /** | |
1887 | * regulator_bulk_enable - enable multiple regulator consumers | |
1888 | * | |
1889 | * @num_consumers: Number of consumers | |
1890 | * @consumers: Consumer data; clients are stored here. | |
1891 | * @return 0 on success, an errno on failure | |
1892 | * | |
1893 | * This convenience API allows consumers to enable multiple regulator | |
1894 | * clients in a single API call. If any consumers cannot be enabled | |
1895 | * then any others that were enabled will be disabled again prior to | |
1896 | * return. | |
1897 | */ | |
1898 | int regulator_bulk_enable(int num_consumers, | |
1899 | struct regulator_bulk_data *consumers) | |
1900 | { | |
1901 | int i; | |
1902 | int ret; | |
1903 | ||
1904 | for (i = 0; i < num_consumers; i++) { | |
1905 | ret = regulator_enable(consumers[i].consumer); | |
1906 | if (ret != 0) | |
1907 | goto err; | |
1908 | } | |
1909 | ||
1910 | return 0; | |
1911 | ||
1912 | err: | |
1913 | printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); | |
1914 | for (i = 0; i < num_consumers; i++) | |
1915 | regulator_disable(consumers[i].consumer); | |
1916 | ||
1917 | return ret; | |
1918 | } | |
1919 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
1920 | ||
1921 | /** | |
1922 | * regulator_bulk_disable - disable multiple regulator consumers | |
1923 | * | |
1924 | * @num_consumers: Number of consumers | |
1925 | * @consumers: Consumer data; clients are stored here. | |
1926 | * @return 0 on success, an errno on failure | |
1927 | * | |
1928 | * This convenience API allows consumers to disable multiple regulator | |
1929 | * clients in a single API call. If any consumers cannot be enabled | |
1930 | * then any others that were disabled will be disabled again prior to | |
1931 | * return. | |
1932 | */ | |
1933 | int regulator_bulk_disable(int num_consumers, | |
1934 | struct regulator_bulk_data *consumers) | |
1935 | { | |
1936 | int i; | |
1937 | int ret; | |
1938 | ||
1939 | for (i = 0; i < num_consumers; i++) { | |
1940 | ret = regulator_disable(consumers[i].consumer); | |
1941 | if (ret != 0) | |
1942 | goto err; | |
1943 | } | |
1944 | ||
1945 | return 0; | |
1946 | ||
1947 | err: | |
1948 | printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); | |
1949 | for (i = 0; i < num_consumers; i++) | |
1950 | regulator_enable(consumers[i].consumer); | |
1951 | ||
1952 | return ret; | |
1953 | } | |
1954 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
1955 | ||
1956 | /** | |
1957 | * regulator_bulk_free - free multiple regulator consumers | |
1958 | * | |
1959 | * @num_consumers: Number of consumers | |
1960 | * @consumers: Consumer data; clients are stored here. | |
1961 | * | |
1962 | * This convenience API allows consumers to free multiple regulator | |
1963 | * clients in a single API call. | |
1964 | */ | |
1965 | void regulator_bulk_free(int num_consumers, | |
1966 | struct regulator_bulk_data *consumers) | |
1967 | { | |
1968 | int i; | |
1969 | ||
1970 | for (i = 0; i < num_consumers; i++) { | |
1971 | regulator_put(consumers[i].consumer); | |
1972 | consumers[i].consumer = NULL; | |
1973 | } | |
1974 | } | |
1975 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
1976 | ||
1977 | /** | |
1978 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 1979 | * @rdev: regulator source |
414c70cb | 1980 | * @event: notifier block |
69279fb9 | 1981 | * @data: callback-specific data. |
414c70cb LG |
1982 | * |
1983 | * Called by regulator drivers to notify clients a regulator event has | |
1984 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 1985 | * Note lock must be held by caller. |
414c70cb LG |
1986 | */ |
1987 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
1988 | unsigned long event, void *data) | |
1989 | { | |
1990 | _notifier_call_chain(rdev, event, data); | |
1991 | return NOTIFY_DONE; | |
1992 | ||
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
1995 | ||
be721979 MB |
1996 | /** |
1997 | * regulator_mode_to_status - convert a regulator mode into a status | |
1998 | * | |
1999 | * @mode: Mode to convert | |
2000 | * | |
2001 | * Convert a regulator mode into a status. | |
2002 | */ | |
2003 | int regulator_mode_to_status(unsigned int mode) | |
2004 | { | |
2005 | switch (mode) { | |
2006 | case REGULATOR_MODE_FAST: | |
2007 | return REGULATOR_STATUS_FAST; | |
2008 | case REGULATOR_MODE_NORMAL: | |
2009 | return REGULATOR_STATUS_NORMAL; | |
2010 | case REGULATOR_MODE_IDLE: | |
2011 | return REGULATOR_STATUS_IDLE; | |
2012 | case REGULATOR_STATUS_STANDBY: | |
2013 | return REGULATOR_STATUS_STANDBY; | |
2014 | default: | |
2015 | return 0; | |
2016 | } | |
2017 | } | |
2018 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2019 | ||
7ad68e2f DB |
2020 | /* |
2021 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2022 | * create attributes that can be meaningfully displayed. | |
2023 | */ | |
2024 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2025 | { | |
2026 | struct device *dev = &rdev->dev; | |
2027 | struct regulator_ops *ops = rdev->desc->ops; | |
2028 | int status = 0; | |
2029 | ||
2030 | /* some attributes need specific methods to be displayed */ | |
2031 | if (ops->get_voltage) { | |
2032 | status = device_create_file(dev, &dev_attr_microvolts); | |
2033 | if (status < 0) | |
2034 | return status; | |
2035 | } | |
2036 | if (ops->get_current_limit) { | |
2037 | status = device_create_file(dev, &dev_attr_microamps); | |
2038 | if (status < 0) | |
2039 | return status; | |
2040 | } | |
2041 | if (ops->get_mode) { | |
2042 | status = device_create_file(dev, &dev_attr_opmode); | |
2043 | if (status < 0) | |
2044 | return status; | |
2045 | } | |
2046 | if (ops->is_enabled) { | |
2047 | status = device_create_file(dev, &dev_attr_state); | |
2048 | if (status < 0) | |
2049 | return status; | |
2050 | } | |
853116a1 DB |
2051 | if (ops->get_status) { |
2052 | status = device_create_file(dev, &dev_attr_status); | |
2053 | if (status < 0) | |
2054 | return status; | |
2055 | } | |
7ad68e2f DB |
2056 | |
2057 | /* some attributes are type-specific */ | |
2058 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2059 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2060 | if (status < 0) | |
2061 | return status; | |
2062 | } | |
2063 | ||
2064 | /* all the other attributes exist to support constraints; | |
2065 | * don't show them if there are no constraints, or if the | |
2066 | * relevant supporting methods are missing. | |
2067 | */ | |
2068 | if (!rdev->constraints) | |
2069 | return status; | |
2070 | ||
2071 | /* constraints need specific supporting methods */ | |
2072 | if (ops->set_voltage) { | |
2073 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2074 | if (status < 0) | |
2075 | return status; | |
2076 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2077 | if (status < 0) | |
2078 | return status; | |
2079 | } | |
2080 | if (ops->set_current_limit) { | |
2081 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2082 | if (status < 0) | |
2083 | return status; | |
2084 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2085 | if (status < 0) | |
2086 | return status; | |
2087 | } | |
2088 | ||
2089 | /* suspend mode constraints need multiple supporting methods */ | |
2090 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2091 | return status; | |
2092 | ||
2093 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2094 | if (status < 0) | |
2095 | return status; | |
2096 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2097 | if (status < 0) | |
2098 | return status; | |
2099 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2100 | if (status < 0) | |
2101 | return status; | |
2102 | ||
2103 | if (ops->set_suspend_voltage) { | |
2104 | status = device_create_file(dev, | |
2105 | &dev_attr_suspend_standby_microvolts); | |
2106 | if (status < 0) | |
2107 | return status; | |
2108 | status = device_create_file(dev, | |
2109 | &dev_attr_suspend_mem_microvolts); | |
2110 | if (status < 0) | |
2111 | return status; | |
2112 | status = device_create_file(dev, | |
2113 | &dev_attr_suspend_disk_microvolts); | |
2114 | if (status < 0) | |
2115 | return status; | |
2116 | } | |
2117 | ||
2118 | if (ops->set_suspend_mode) { | |
2119 | status = device_create_file(dev, | |
2120 | &dev_attr_suspend_standby_mode); | |
2121 | if (status < 0) | |
2122 | return status; | |
2123 | status = device_create_file(dev, | |
2124 | &dev_attr_suspend_mem_mode); | |
2125 | if (status < 0) | |
2126 | return status; | |
2127 | status = device_create_file(dev, | |
2128 | &dev_attr_suspend_disk_mode); | |
2129 | if (status < 0) | |
2130 | return status; | |
2131 | } | |
2132 | ||
2133 | return status; | |
2134 | } | |
2135 | ||
414c70cb LG |
2136 | /** |
2137 | * regulator_register - register regulator | |
69279fb9 MB |
2138 | * @regulator_desc: regulator to register |
2139 | * @dev: struct device for the regulator | |
0527100f | 2140 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2141 | * @driver_data: private regulator data |
414c70cb LG |
2142 | * |
2143 | * Called by regulator drivers to register a regulator. | |
2144 | * Returns 0 on success. | |
2145 | */ | |
2146 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
2147 | struct device *dev, struct regulator_init_data *init_data, |
2148 | void *driver_data) | |
414c70cb LG |
2149 | { |
2150 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2151 | struct regulator_dev *rdev; | |
a5766f11 | 2152 | int ret, i; |
414c70cb LG |
2153 | |
2154 | if (regulator_desc == NULL) | |
2155 | return ERR_PTR(-EINVAL); | |
2156 | ||
2157 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2158 | return ERR_PTR(-EINVAL); | |
2159 | ||
cd78dfc6 DL |
2160 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2161 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2162 | return ERR_PTR(-EINVAL); |
2163 | ||
46fabe1e MB |
2164 | if (!init_data) |
2165 | return ERR_PTR(-EINVAL); | |
2166 | ||
414c70cb LG |
2167 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2168 | if (rdev == NULL) | |
2169 | return ERR_PTR(-ENOMEM); | |
2170 | ||
2171 | mutex_lock(®ulator_list_mutex); | |
2172 | ||
2173 | mutex_init(&rdev->mutex); | |
a5766f11 | 2174 | rdev->reg_data = driver_data; |
414c70cb LG |
2175 | rdev->owner = regulator_desc->owner; |
2176 | rdev->desc = regulator_desc; | |
2177 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2178 | INIT_LIST_HEAD(&rdev->supply_list); | |
2179 | INIT_LIST_HEAD(&rdev->list); | |
2180 | INIT_LIST_HEAD(&rdev->slist); | |
2181 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2182 | ||
a5766f11 LG |
2183 | /* preform any regulator specific init */ |
2184 | if (init_data->regulator_init) { | |
2185 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2186 | if (ret < 0) |
2187 | goto clean; | |
a5766f11 LG |
2188 | } |
2189 | ||
a5766f11 | 2190 | /* register with sysfs */ |
414c70cb | 2191 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2192 | rdev->dev.parent = dev; |
812460a9 KS |
2193 | dev_set_name(&rdev->dev, "regulator.%d", |
2194 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2195 | ret = device_register(&rdev->dev); |
4fca9545 DB |
2196 | if (ret != 0) |
2197 | goto clean; | |
a5766f11 LG |
2198 | |
2199 | dev_set_drvdata(&rdev->dev, rdev); | |
2200 | ||
74f544c1 MR |
2201 | /* set regulator constraints */ |
2202 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2203 | if (ret < 0) | |
2204 | goto scrub; | |
2205 | ||
7ad68e2f DB |
2206 | /* add attributes supported by this regulator */ |
2207 | ret = add_regulator_attributes(rdev); | |
2208 | if (ret < 0) | |
2209 | goto scrub; | |
2210 | ||
a5766f11 LG |
2211 | /* set supply regulator if it exists */ |
2212 | if (init_data->supply_regulator_dev) { | |
2213 | ret = set_supply(rdev, | |
2214 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2215 | if (ret < 0) |
2216 | goto scrub; | |
a5766f11 LG |
2217 | } |
2218 | ||
2219 | /* add consumers devices */ | |
2220 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2221 | ret = set_consumer_device_supply(rdev, | |
2222 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2223 | init_data->consumer_supplies[i].dev_name, |
a5766f11 LG |
2224 | init_data->consumer_supplies[i].supply); |
2225 | if (ret < 0) { | |
2226 | for (--i; i >= 0; i--) | |
2227 | unset_consumer_device_supply(rdev, | |
40f9244f MB |
2228 | init_data->consumer_supplies[i].dev_name, |
2229 | init_data->consumer_supplies[i].dev); | |
4fca9545 | 2230 | goto scrub; |
a5766f11 | 2231 | } |
414c70cb | 2232 | } |
a5766f11 LG |
2233 | |
2234 | list_add(&rdev->list, ®ulator_list); | |
2235 | out: | |
414c70cb LG |
2236 | mutex_unlock(®ulator_list_mutex); |
2237 | return rdev; | |
4fca9545 DB |
2238 | |
2239 | scrub: | |
2240 | device_unregister(&rdev->dev); | |
53032daf PW |
2241 | /* device core frees rdev */ |
2242 | rdev = ERR_PTR(ret); | |
2243 | goto out; | |
2244 | ||
4fca9545 DB |
2245 | clean: |
2246 | kfree(rdev); | |
2247 | rdev = ERR_PTR(ret); | |
2248 | goto out; | |
414c70cb LG |
2249 | } |
2250 | EXPORT_SYMBOL_GPL(regulator_register); | |
2251 | ||
2252 | /** | |
2253 | * regulator_unregister - unregister regulator | |
69279fb9 | 2254 | * @rdev: regulator to unregister |
414c70cb LG |
2255 | * |
2256 | * Called by regulator drivers to unregister a regulator. | |
2257 | */ | |
2258 | void regulator_unregister(struct regulator_dev *rdev) | |
2259 | { | |
2260 | if (rdev == NULL) | |
2261 | return; | |
2262 | ||
2263 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2264 | WARN_ON(rdev->open_count); |
0f1d747b | 2265 | unset_regulator_supplies(rdev); |
414c70cb LG |
2266 | list_del(&rdev->list); |
2267 | if (rdev->supply) | |
2268 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2269 | device_unregister(&rdev->dev); | |
2270 | mutex_unlock(®ulator_list_mutex); | |
2271 | } | |
2272 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2273 | ||
414c70cb | 2274 | /** |
cf7bbcdf | 2275 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2276 | * @state: system suspend state |
2277 | * | |
2278 | * Configure each regulator with it's suspend operating parameters for state. | |
2279 | * This will usually be called by machine suspend code prior to supending. | |
2280 | */ | |
2281 | int regulator_suspend_prepare(suspend_state_t state) | |
2282 | { | |
2283 | struct regulator_dev *rdev; | |
2284 | int ret = 0; | |
2285 | ||
2286 | /* ON is handled by regulator active state */ | |
2287 | if (state == PM_SUSPEND_ON) | |
2288 | return -EINVAL; | |
2289 | ||
2290 | mutex_lock(®ulator_list_mutex); | |
2291 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2292 | ||
2293 | mutex_lock(&rdev->mutex); | |
2294 | ret = suspend_prepare(rdev, state); | |
2295 | mutex_unlock(&rdev->mutex); | |
2296 | ||
2297 | if (ret < 0) { | |
2298 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
2299 | __func__, rdev->desc->name); | |
2300 | goto out; | |
2301 | } | |
2302 | } | |
2303 | out: | |
2304 | mutex_unlock(®ulator_list_mutex); | |
2305 | return ret; | |
2306 | } | |
2307 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2308 | ||
ca725561 MB |
2309 | /** |
2310 | * regulator_has_full_constraints - the system has fully specified constraints | |
2311 | * | |
2312 | * Calling this function will cause the regulator API to disable all | |
2313 | * regulators which have a zero use count and don't have an always_on | |
2314 | * constraint in a late_initcall. | |
2315 | * | |
2316 | * The intention is that this will become the default behaviour in a | |
2317 | * future kernel release so users are encouraged to use this facility | |
2318 | * now. | |
2319 | */ | |
2320 | void regulator_has_full_constraints(void) | |
2321 | { | |
2322 | has_full_constraints = 1; | |
2323 | } | |
2324 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2325 | ||
414c70cb LG |
2326 | /** |
2327 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2328 | * @rdev: regulator |
414c70cb LG |
2329 | * |
2330 | * Get rdev regulator driver private data. This call can be used in the | |
2331 | * regulator driver context. | |
2332 | */ | |
2333 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2334 | { | |
2335 | return rdev->reg_data; | |
2336 | } | |
2337 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2338 | ||
2339 | /** | |
2340 | * regulator_get_drvdata - get regulator driver data | |
2341 | * @regulator: regulator | |
2342 | * | |
2343 | * Get regulator driver private data. This call can be used in the consumer | |
2344 | * driver context when non API regulator specific functions need to be called. | |
2345 | */ | |
2346 | void *regulator_get_drvdata(struct regulator *regulator) | |
2347 | { | |
2348 | return regulator->rdev->reg_data; | |
2349 | } | |
2350 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2351 | ||
2352 | /** | |
2353 | * regulator_set_drvdata - set regulator driver data | |
2354 | * @regulator: regulator | |
2355 | * @data: data | |
2356 | */ | |
2357 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2358 | { | |
2359 | regulator->rdev->reg_data = data; | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2362 | ||
2363 | /** | |
2364 | * regulator_get_id - get regulator ID | |
69279fb9 | 2365 | * @rdev: regulator |
414c70cb LG |
2366 | */ |
2367 | int rdev_get_id(struct regulator_dev *rdev) | |
2368 | { | |
2369 | return rdev->desc->id; | |
2370 | } | |
2371 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2372 | ||
a5766f11 LG |
2373 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2374 | { | |
2375 | return &rdev->dev; | |
2376 | } | |
2377 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2378 | ||
2379 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2380 | { | |
2381 | return reg_init_data->driver_data; | |
2382 | } | |
2383 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2384 | ||
414c70cb LG |
2385 | static int __init regulator_init(void) |
2386 | { | |
2387 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); | |
2388 | return class_register(®ulator_class); | |
2389 | } | |
2390 | ||
2391 | /* init early to allow our consumers to complete system booting */ | |
2392 | core_initcall(regulator_init); | |
ca725561 MB |
2393 | |
2394 | static int __init regulator_init_complete(void) | |
2395 | { | |
2396 | struct regulator_dev *rdev; | |
2397 | struct regulator_ops *ops; | |
2398 | struct regulation_constraints *c; | |
2399 | int enabled, ret; | |
2400 | const char *name; | |
2401 | ||
2402 | mutex_lock(®ulator_list_mutex); | |
2403 | ||
2404 | /* If we have a full configuration then disable any regulators | |
2405 | * which are not in use or always_on. This will become the | |
2406 | * default behaviour in the future. | |
2407 | */ | |
2408 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2409 | ops = rdev->desc->ops; | |
2410 | c = rdev->constraints; | |
2411 | ||
2412 | if (c->name) | |
2413 | name = c->name; | |
2414 | else if (rdev->desc->name) | |
2415 | name = rdev->desc->name; | |
2416 | else | |
2417 | name = "regulator"; | |
2418 | ||
2419 | if (!ops->disable || c->always_on) | |
2420 | continue; | |
2421 | ||
2422 | mutex_lock(&rdev->mutex); | |
2423 | ||
2424 | if (rdev->use_count) | |
2425 | goto unlock; | |
2426 | ||
2427 | /* If we can't read the status assume it's on. */ | |
2428 | if (ops->is_enabled) | |
2429 | enabled = ops->is_enabled(rdev); | |
2430 | else | |
2431 | enabled = 1; | |
2432 | ||
2433 | if (!enabled) | |
2434 | goto unlock; | |
2435 | ||
2436 | if (has_full_constraints) { | |
2437 | /* We log since this may kill the system if it | |
2438 | * goes wrong. */ | |
2439 | printk(KERN_INFO "%s: disabling %s\n", | |
2440 | __func__, name); | |
2441 | ret = ops->disable(rdev); | |
2442 | if (ret != 0) { | |
2443 | printk(KERN_ERR | |
2444 | "%s: couldn't disable %s: %d\n", | |
2445 | __func__, name, ret); | |
2446 | } | |
2447 | } else { | |
2448 | /* The intention is that in future we will | |
2449 | * assume that full constraints are provided | |
2450 | * so warn even if we aren't going to do | |
2451 | * anything here. | |
2452 | */ | |
2453 | printk(KERN_WARNING | |
2454 | "%s: incomplete constraints, leaving %s on\n", | |
2455 | __func__, name); | |
2456 | } | |
2457 | ||
2458 | unlock: | |
2459 | mutex_unlock(&rdev->mutex); | |
2460 | } | |
2461 | ||
2462 | mutex_unlock(®ulator_list_mutex); | |
2463 | ||
2464 | return 0; | |
2465 | } | |
2466 | late_initcall(regulator_init_complete); |