Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
414c70cb LG |
20 | #include <linux/err.h> |
21 | #include <linux/mutex.h> | |
22 | #include <linux/suspend.h> | |
31aae2be | 23 | #include <linux/delay.h> |
414c70cb LG |
24 | #include <linux/regulator/consumer.h> |
25 | #include <linux/regulator/driver.h> | |
26 | #include <linux/regulator/machine.h> | |
27 | ||
34abbd68 MB |
28 | #include "dummy.h" |
29 | ||
414c70cb LG |
30 | #define REGULATOR_VERSION "0.5" |
31 | ||
32 | static DEFINE_MUTEX(regulator_list_mutex); | |
33 | static LIST_HEAD(regulator_list); | |
34 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 35 | static int has_full_constraints; |
414c70cb | 36 | |
8dc5390d | 37 | /* |
414c70cb LG |
38 | * struct regulator_map |
39 | * | |
40 | * Used to provide symbolic supply names to devices. | |
41 | */ | |
42 | struct regulator_map { | |
43 | struct list_head list; | |
40f9244f | 44 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 45 | const char *supply; |
a5766f11 | 46 | struct regulator_dev *regulator; |
414c70cb LG |
47 | }; |
48 | ||
414c70cb LG |
49 | /* |
50 | * struct regulator | |
51 | * | |
52 | * One for each consumer device. | |
53 | */ | |
54 | struct regulator { | |
55 | struct device *dev; | |
56 | struct list_head list; | |
57 | int uA_load; | |
58 | int min_uV; | |
59 | int max_uV; | |
414c70cb LG |
60 | char *supply_name; |
61 | struct device_attribute dev_attr; | |
62 | struct regulator_dev *rdev; | |
63 | }; | |
64 | ||
65 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
66 | static int _regulator_disable(struct regulator_dev *rdev); | |
67 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
68 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
69 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
70 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
71 | unsigned long event, void *data); | |
72 | ||
1083c393 MB |
73 | static const char *rdev_get_name(struct regulator_dev *rdev) |
74 | { | |
75 | if (rdev->constraints && rdev->constraints->name) | |
76 | return rdev->constraints->name; | |
77 | else if (rdev->desc->name) | |
78 | return rdev->desc->name; | |
79 | else | |
80 | return ""; | |
81 | } | |
82 | ||
414c70cb LG |
83 | /* gets the regulator for a given consumer device */ |
84 | static struct regulator *get_device_regulator(struct device *dev) | |
85 | { | |
86 | struct regulator *regulator = NULL; | |
87 | struct regulator_dev *rdev; | |
88 | ||
89 | mutex_lock(®ulator_list_mutex); | |
90 | list_for_each_entry(rdev, ®ulator_list, list) { | |
91 | mutex_lock(&rdev->mutex); | |
92 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
93 | if (regulator->dev == dev) { | |
94 | mutex_unlock(&rdev->mutex); | |
95 | mutex_unlock(®ulator_list_mutex); | |
96 | return regulator; | |
97 | } | |
98 | } | |
99 | mutex_unlock(&rdev->mutex); | |
100 | } | |
101 | mutex_unlock(®ulator_list_mutex); | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | /* Platform voltage constraint check */ | |
106 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
107 | int *min_uV, int *max_uV) | |
108 | { | |
109 | BUG_ON(*min_uV > *max_uV); | |
110 | ||
111 | if (!rdev->constraints) { | |
112 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 113 | rdev_get_name(rdev)); |
414c70cb LG |
114 | return -ENODEV; |
115 | } | |
116 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
117 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 118 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
119 | return -EPERM; |
120 | } | |
121 | ||
122 | if (*max_uV > rdev->constraints->max_uV) | |
123 | *max_uV = rdev->constraints->max_uV; | |
124 | if (*min_uV < rdev->constraints->min_uV) | |
125 | *min_uV = rdev->constraints->min_uV; | |
126 | ||
127 | if (*min_uV > *max_uV) | |
128 | return -EINVAL; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | /* current constraint check */ | |
134 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
135 | int *min_uA, int *max_uA) | |
136 | { | |
137 | BUG_ON(*min_uA > *max_uA); | |
138 | ||
139 | if (!rdev->constraints) { | |
140 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 141 | rdev_get_name(rdev)); |
414c70cb LG |
142 | return -ENODEV; |
143 | } | |
144 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
145 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 146 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
147 | return -EPERM; |
148 | } | |
149 | ||
150 | if (*max_uA > rdev->constraints->max_uA) | |
151 | *max_uA = rdev->constraints->max_uA; | |
152 | if (*min_uA < rdev->constraints->min_uA) | |
153 | *min_uA = rdev->constraints->min_uA; | |
154 | ||
155 | if (*min_uA > *max_uA) | |
156 | return -EINVAL; | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | /* operating mode constraint check */ | |
162 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
163 | { | |
e573520b DB |
164 | switch (mode) { |
165 | case REGULATOR_MODE_FAST: | |
166 | case REGULATOR_MODE_NORMAL: | |
167 | case REGULATOR_MODE_IDLE: | |
168 | case REGULATOR_MODE_STANDBY: | |
169 | break; | |
170 | default: | |
171 | return -EINVAL; | |
172 | } | |
173 | ||
414c70cb LG |
174 | if (!rdev->constraints) { |
175 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 176 | rdev_get_name(rdev)); |
414c70cb LG |
177 | return -ENODEV; |
178 | } | |
179 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
180 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 181 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
182 | return -EPERM; |
183 | } | |
184 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
185 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
1083c393 | 186 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
187 | return -EINVAL; |
188 | } | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* dynamic regulator mode switching constraint check */ | |
193 | static int regulator_check_drms(struct regulator_dev *rdev) | |
194 | { | |
195 | if (!rdev->constraints) { | |
196 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 197 | rdev_get_name(rdev)); |
414c70cb LG |
198 | return -ENODEV; |
199 | } | |
200 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
201 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 202 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
203 | return -EPERM; |
204 | } | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static ssize_t device_requested_uA_show(struct device *dev, | |
209 | struct device_attribute *attr, char *buf) | |
210 | { | |
211 | struct regulator *regulator; | |
212 | ||
213 | regulator = get_device_regulator(dev); | |
214 | if (regulator == NULL) | |
215 | return 0; | |
216 | ||
217 | return sprintf(buf, "%d\n", regulator->uA_load); | |
218 | } | |
219 | ||
220 | static ssize_t regulator_uV_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 | ssize_t ret; |
225 | ||
226 | mutex_lock(&rdev->mutex); | |
227 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
228 | mutex_unlock(&rdev->mutex); | |
229 | ||
230 | return ret; | |
231 | } | |
7ad68e2f | 232 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
233 | |
234 | static ssize_t regulator_uA_show(struct device *dev, | |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
a5766f11 | 237 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
238 | |
239 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
240 | } | |
7ad68e2f | 241 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 242 | |
bc558a60 MB |
243 | static ssize_t regulator_name_show(struct device *dev, |
244 | struct device_attribute *attr, char *buf) | |
245 | { | |
246 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 247 | |
1083c393 | 248 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
249 | } |
250 | ||
4fca9545 | 251 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 252 | { |
414c70cb LG |
253 | switch (mode) { |
254 | case REGULATOR_MODE_FAST: | |
255 | return sprintf(buf, "fast\n"); | |
256 | case REGULATOR_MODE_NORMAL: | |
257 | return sprintf(buf, "normal\n"); | |
258 | case REGULATOR_MODE_IDLE: | |
259 | return sprintf(buf, "idle\n"); | |
260 | case REGULATOR_MODE_STANDBY: | |
261 | return sprintf(buf, "standby\n"); | |
262 | } | |
263 | return sprintf(buf, "unknown\n"); | |
264 | } | |
265 | ||
4fca9545 DB |
266 | static ssize_t regulator_opmode_show(struct device *dev, |
267 | struct device_attribute *attr, char *buf) | |
414c70cb | 268 | { |
a5766f11 | 269 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 270 | |
4fca9545 DB |
271 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
272 | } | |
7ad68e2f | 273 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
274 | |
275 | static ssize_t regulator_print_state(char *buf, int state) | |
276 | { | |
414c70cb LG |
277 | if (state > 0) |
278 | return sprintf(buf, "enabled\n"); | |
279 | else if (state == 0) | |
280 | return sprintf(buf, "disabled\n"); | |
281 | else | |
282 | return sprintf(buf, "unknown\n"); | |
283 | } | |
284 | ||
4fca9545 DB |
285 | static ssize_t regulator_state_show(struct device *dev, |
286 | struct device_attribute *attr, char *buf) | |
287 | { | |
288 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
289 | ssize_t ret; |
290 | ||
291 | mutex_lock(&rdev->mutex); | |
292 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
293 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 294 | |
9332546f | 295 | return ret; |
4fca9545 | 296 | } |
7ad68e2f | 297 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 298 | |
853116a1 DB |
299 | static ssize_t regulator_status_show(struct device *dev, |
300 | struct device_attribute *attr, char *buf) | |
301 | { | |
302 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
303 | int status; | |
304 | char *label; | |
305 | ||
306 | status = rdev->desc->ops->get_status(rdev); | |
307 | if (status < 0) | |
308 | return status; | |
309 | ||
310 | switch (status) { | |
311 | case REGULATOR_STATUS_OFF: | |
312 | label = "off"; | |
313 | break; | |
314 | case REGULATOR_STATUS_ON: | |
315 | label = "on"; | |
316 | break; | |
317 | case REGULATOR_STATUS_ERROR: | |
318 | label = "error"; | |
319 | break; | |
320 | case REGULATOR_STATUS_FAST: | |
321 | label = "fast"; | |
322 | break; | |
323 | case REGULATOR_STATUS_NORMAL: | |
324 | label = "normal"; | |
325 | break; | |
326 | case REGULATOR_STATUS_IDLE: | |
327 | label = "idle"; | |
328 | break; | |
329 | case REGULATOR_STATUS_STANDBY: | |
330 | label = "standby"; | |
331 | break; | |
332 | default: | |
333 | return -ERANGE; | |
334 | } | |
335 | ||
336 | return sprintf(buf, "%s\n", label); | |
337 | } | |
338 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
339 | ||
414c70cb LG |
340 | static ssize_t regulator_min_uA_show(struct device *dev, |
341 | struct device_attribute *attr, char *buf) | |
342 | { | |
a5766f11 | 343 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
344 | |
345 | if (!rdev->constraints) | |
346 | return sprintf(buf, "constraint not defined\n"); | |
347 | ||
348 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
349 | } | |
7ad68e2f | 350 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
351 | |
352 | static ssize_t regulator_max_uA_show(struct device *dev, | |
353 | struct device_attribute *attr, char *buf) | |
354 | { | |
a5766f11 | 355 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
356 | |
357 | if (!rdev->constraints) | |
358 | return sprintf(buf, "constraint not defined\n"); | |
359 | ||
360 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
361 | } | |
7ad68e2f | 362 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
363 | |
364 | static ssize_t regulator_min_uV_show(struct device *dev, | |
365 | struct device_attribute *attr, char *buf) | |
366 | { | |
a5766f11 | 367 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
368 | |
369 | if (!rdev->constraints) | |
370 | return sprintf(buf, "constraint not defined\n"); | |
371 | ||
372 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
373 | } | |
7ad68e2f | 374 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
375 | |
376 | static ssize_t regulator_max_uV_show(struct device *dev, | |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
a5766f11 | 379 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
380 | |
381 | if (!rdev->constraints) | |
382 | return sprintf(buf, "constraint not defined\n"); | |
383 | ||
384 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
385 | } | |
7ad68e2f | 386 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
387 | |
388 | static ssize_t regulator_total_uA_show(struct device *dev, | |
389 | struct device_attribute *attr, char *buf) | |
390 | { | |
a5766f11 | 391 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
392 | struct regulator *regulator; |
393 | int uA = 0; | |
394 | ||
395 | mutex_lock(&rdev->mutex); | |
396 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 397 | uA += regulator->uA_load; |
414c70cb LG |
398 | mutex_unlock(&rdev->mutex); |
399 | return sprintf(buf, "%d\n", uA); | |
400 | } | |
7ad68e2f | 401 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
402 | |
403 | static ssize_t regulator_num_users_show(struct device *dev, | |
404 | struct device_attribute *attr, char *buf) | |
405 | { | |
a5766f11 | 406 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
407 | return sprintf(buf, "%d\n", rdev->use_count); |
408 | } | |
409 | ||
410 | static ssize_t regulator_type_show(struct device *dev, | |
411 | struct device_attribute *attr, char *buf) | |
412 | { | |
a5766f11 | 413 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
414 | |
415 | switch (rdev->desc->type) { | |
416 | case REGULATOR_VOLTAGE: | |
417 | return sprintf(buf, "voltage\n"); | |
418 | case REGULATOR_CURRENT: | |
419 | return sprintf(buf, "current\n"); | |
420 | } | |
421 | return sprintf(buf, "unknown\n"); | |
422 | } | |
423 | ||
424 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
425 | struct device_attribute *attr, char *buf) | |
426 | { | |
a5766f11 | 427 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 428 | |
414c70cb LG |
429 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
430 | } | |
7ad68e2f DB |
431 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
432 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
433 | |
434 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
435 | struct device_attribute *attr, char *buf) | |
436 | { | |
a5766f11 | 437 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 438 | |
414c70cb LG |
439 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
440 | } | |
7ad68e2f DB |
441 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
442 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
443 | |
444 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
445 | struct device_attribute *attr, char *buf) | |
446 | { | |
a5766f11 | 447 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 448 | |
414c70cb LG |
449 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
450 | } | |
7ad68e2f DB |
451 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
452 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 453 | |
414c70cb LG |
454 | static ssize_t regulator_suspend_mem_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_mem.mode); | |
414c70cb | 461 | } |
7ad68e2f DB |
462 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
463 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
464 | |
465 | static ssize_t regulator_suspend_disk_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_disk.mode); | |
414c70cb | 472 | } |
7ad68e2f DB |
473 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
474 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
475 | |
476 | static ssize_t regulator_suspend_standby_mode_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_opmode(buf, |
482 | rdev->constraints->state_standby.mode); | |
414c70cb | 483 | } |
7ad68e2f DB |
484 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
485 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
486 | |
487 | static ssize_t regulator_suspend_mem_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_mem.enabled); | |
414c70cb | 494 | } |
7ad68e2f DB |
495 | static DEVICE_ATTR(suspend_mem_state, 0444, |
496 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
497 | |
498 | static ssize_t regulator_suspend_disk_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_disk.enabled); | |
414c70cb | 505 | } |
7ad68e2f DB |
506 | static DEVICE_ATTR(suspend_disk_state, 0444, |
507 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
508 | |
509 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
510 | struct device_attribute *attr, char *buf) | |
511 | { | |
a5766f11 | 512 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 513 | |
4fca9545 DB |
514 | return regulator_print_state(buf, |
515 | rdev->constraints->state_standby.enabled); | |
414c70cb | 516 | } |
7ad68e2f DB |
517 | static DEVICE_ATTR(suspend_standby_state, 0444, |
518 | regulator_suspend_standby_state_show, NULL); | |
519 | ||
bc558a60 | 520 | |
7ad68e2f DB |
521 | /* |
522 | * These are the only attributes are present for all regulators. | |
523 | * Other attributes are a function of regulator functionality. | |
524 | */ | |
414c70cb | 525 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 526 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
527 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
528 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
529 | __ATTR_NULL, |
530 | }; | |
531 | ||
532 | static void regulator_dev_release(struct device *dev) | |
533 | { | |
a5766f11 | 534 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
535 | kfree(rdev); |
536 | } | |
537 | ||
538 | static struct class regulator_class = { | |
539 | .name = "regulator", | |
540 | .dev_release = regulator_dev_release, | |
541 | .dev_attrs = regulator_dev_attrs, | |
542 | }; | |
543 | ||
544 | /* Calculate the new optimum regulator operating mode based on the new total | |
545 | * consumer load. All locks held by caller */ | |
546 | static void drms_uA_update(struct regulator_dev *rdev) | |
547 | { | |
548 | struct regulator *sibling; | |
549 | int current_uA = 0, output_uV, input_uV, err; | |
550 | unsigned int mode; | |
551 | ||
552 | err = regulator_check_drms(rdev); | |
553 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
036de8ef DC |
554 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) |
555 | return; | |
414c70cb LG |
556 | |
557 | /* get output voltage */ | |
558 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
559 | if (output_uV <= 0) | |
560 | return; | |
561 | ||
562 | /* get input voltage */ | |
563 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
564 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
565 | else | |
566 | input_uV = rdev->constraints->input_uV; | |
567 | if (input_uV <= 0) | |
568 | return; | |
569 | ||
570 | /* calc total requested load */ | |
571 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 572 | current_uA += sibling->uA_load; |
414c70cb LG |
573 | |
574 | /* now get the optimum mode for our new total regulator load */ | |
575 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
576 | output_uV, current_uA); | |
577 | ||
578 | /* check the new mode is allowed */ | |
579 | err = regulator_check_mode(rdev, mode); | |
580 | if (err == 0) | |
581 | rdev->desc->ops->set_mode(rdev, mode); | |
582 | } | |
583 | ||
584 | static int suspend_set_state(struct regulator_dev *rdev, | |
585 | struct regulator_state *rstate) | |
586 | { | |
587 | int ret = 0; | |
638f85c5 MB |
588 | bool can_set_state; |
589 | ||
590 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
591 | rdev->desc->ops->set_suspend_disable; | |
592 | ||
593 | /* If we have no suspend mode configration don't set anything; | |
594 | * only warn if the driver actually makes the suspend mode | |
595 | * configurable. | |
596 | */ | |
597 | if (!rstate->enabled && !rstate->disabled) { | |
598 | if (can_set_state) | |
599 | printk(KERN_WARNING "%s: No configuration for %s\n", | |
600 | __func__, rdev_get_name(rdev)); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | if (rstate->enabled && rstate->disabled) { | |
605 | printk(KERN_ERR "%s: invalid configuration for %s\n", | |
606 | __func__, rdev_get_name(rdev)); | |
607 | return -EINVAL; | |
608 | } | |
414c70cb | 609 | |
638f85c5 | 610 | if (!can_set_state) { |
a5766f11 LG |
611 | printk(KERN_ERR "%s: no way to set suspend state\n", |
612 | __func__); | |
414c70cb | 613 | return -EINVAL; |
a5766f11 | 614 | } |
414c70cb LG |
615 | |
616 | if (rstate->enabled) | |
617 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
618 | else | |
619 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
620 | if (ret < 0) { | |
621 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
622 | return ret; | |
623 | } | |
624 | ||
625 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
626 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
627 | if (ret < 0) { | |
628 | printk(KERN_ERR "%s: failed to set voltage\n", | |
629 | __func__); | |
630 | return ret; | |
631 | } | |
632 | } | |
633 | ||
634 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
635 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
636 | if (ret < 0) { | |
637 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
638 | return ret; | |
639 | } | |
640 | } | |
641 | return ret; | |
642 | } | |
643 | ||
644 | /* locks held by caller */ | |
645 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
646 | { | |
647 | if (!rdev->constraints) | |
648 | return -EINVAL; | |
649 | ||
650 | switch (state) { | |
651 | case PM_SUSPEND_STANDBY: | |
652 | return suspend_set_state(rdev, | |
653 | &rdev->constraints->state_standby); | |
654 | case PM_SUSPEND_MEM: | |
655 | return suspend_set_state(rdev, | |
656 | &rdev->constraints->state_mem); | |
657 | case PM_SUSPEND_MAX: | |
658 | return suspend_set_state(rdev, | |
659 | &rdev->constraints->state_disk); | |
660 | default: | |
661 | return -EINVAL; | |
662 | } | |
663 | } | |
664 | ||
665 | static void print_constraints(struct regulator_dev *rdev) | |
666 | { | |
667 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 668 | char buf[80] = ""; |
8f031b48 MB |
669 | int count = 0; |
670 | int ret; | |
414c70cb | 671 | |
8f031b48 | 672 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 673 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
674 | count += sprintf(buf + count, "%d mV ", |
675 | constraints->min_uV / 1000); | |
414c70cb | 676 | else |
8f031b48 MB |
677 | count += sprintf(buf + count, "%d <--> %d mV ", |
678 | constraints->min_uV / 1000, | |
679 | constraints->max_uV / 1000); | |
680 | } | |
681 | ||
682 | if (!constraints->min_uV || | |
683 | constraints->min_uV != constraints->max_uV) { | |
684 | ret = _regulator_get_voltage(rdev); | |
685 | if (ret > 0) | |
686 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
687 | } | |
688 | ||
689 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 690 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
691 | count += sprintf(buf + count, "%d mA ", |
692 | constraints->min_uA / 1000); | |
414c70cb | 693 | else |
8f031b48 MB |
694 | count += sprintf(buf + count, "%d <--> %d mA ", |
695 | constraints->min_uA / 1000, | |
696 | constraints->max_uA / 1000); | |
697 | } | |
698 | ||
699 | if (!constraints->min_uA || | |
700 | constraints->min_uA != constraints->max_uA) { | |
701 | ret = _regulator_get_current_limit(rdev); | |
702 | if (ret > 0) | |
703 | count += sprintf(buf + count, "at %d uA ", ret / 1000); | |
414c70cb | 704 | } |
8f031b48 | 705 | |
414c70cb LG |
706 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
707 | count += sprintf(buf + count, "fast "); | |
708 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
709 | count += sprintf(buf + count, "normal "); | |
710 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
711 | count += sprintf(buf + count, "idle "); | |
712 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
713 | count += sprintf(buf + count, "standby"); | |
714 | ||
1083c393 | 715 | printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); |
414c70cb LG |
716 | } |
717 | ||
e79055d6 | 718 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 719 | struct regulation_constraints *constraints) |
a5766f11 | 720 | { |
e5fda26c | 721 | struct regulator_ops *ops = rdev->desc->ops; |
1083c393 | 722 | const char *name = rdev_get_name(rdev); |
af5866c9 MB |
723 | int ret; |
724 | ||
725 | /* do we need to apply the constraint voltage */ | |
726 | if (rdev->constraints->apply_uV && | |
727 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
728 | ops->set_voltage) { | |
729 | ret = ops->set_voltage(rdev, | |
730 | rdev->constraints->min_uV, rdev->constraints->max_uV); | |
731 | if (ret < 0) { | |
732 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", | |
733 | __func__, | |
734 | rdev->constraints->min_uV, name); | |
735 | rdev->constraints = NULL; | |
736 | return ret; | |
737 | } | |
738 | } | |
e06f5b4f | 739 | |
4367cfdc DB |
740 | /* constrain machine-level voltage specs to fit |
741 | * the actual range supported by this regulator. | |
742 | */ | |
743 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
744 | int count = rdev->desc->n_voltages; | |
745 | int i; | |
746 | int min_uV = INT_MAX; | |
747 | int max_uV = INT_MIN; | |
748 | int cmin = constraints->min_uV; | |
749 | int cmax = constraints->max_uV; | |
750 | ||
3e590918 MB |
751 | /* it's safe to autoconfigure fixed-voltage supplies |
752 | and the constraints are used by list_voltage. */ | |
4367cfdc | 753 | if (count == 1 && !cmin) { |
3e590918 | 754 | cmin = 1; |
4367cfdc | 755 | cmax = INT_MAX; |
3e590918 MB |
756 | constraints->min_uV = cmin; |
757 | constraints->max_uV = cmax; | |
4367cfdc DB |
758 | } |
759 | ||
3e2b9abd MB |
760 | /* voltage constraints are optional */ |
761 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 762 | return 0; |
3e2b9abd | 763 | |
4367cfdc | 764 | /* else require explicit machine-level constraints */ |
3e2b9abd | 765 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
766 | pr_err("%s: %s '%s' voltage constraints\n", |
767 | __func__, "invalid", name); | |
e79055d6 | 768 | return -EINVAL; |
4367cfdc DB |
769 | } |
770 | ||
771 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
772 | for (i = 0; i < count; i++) { | |
773 | int value; | |
774 | ||
775 | value = ops->list_voltage(rdev, i); | |
776 | if (value <= 0) | |
777 | continue; | |
778 | ||
779 | /* maybe adjust [min_uV..max_uV] */ | |
780 | if (value >= cmin && value < min_uV) | |
781 | min_uV = value; | |
782 | if (value <= cmax && value > max_uV) | |
783 | max_uV = value; | |
784 | } | |
785 | ||
786 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
787 | if (max_uV < min_uV) { | |
788 | pr_err("%s: %s '%s' voltage constraints\n", | |
789 | __func__, "unsupportable", name); | |
e79055d6 | 790 | return -EINVAL; |
4367cfdc DB |
791 | } |
792 | ||
793 | /* use regulator's subset of machine constraints */ | |
794 | if (constraints->min_uV < min_uV) { | |
795 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
796 | __func__, name, "min_uV", | |
797 | constraints->min_uV, min_uV); | |
798 | constraints->min_uV = min_uV; | |
799 | } | |
800 | if (constraints->max_uV > max_uV) { | |
801 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
802 | __func__, name, "max_uV", | |
803 | constraints->max_uV, max_uV); | |
804 | constraints->max_uV = max_uV; | |
805 | } | |
806 | } | |
807 | ||
e79055d6 MB |
808 | return 0; |
809 | } | |
810 | ||
811 | /** | |
812 | * set_machine_constraints - sets regulator constraints | |
813 | * @rdev: regulator source | |
814 | * @constraints: constraints to apply | |
815 | * | |
816 | * Allows platform initialisation code to define and constrain | |
817 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
818 | * Constraints *must* be set by platform code in order for some | |
819 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
820 | * set_mode. | |
821 | */ | |
822 | static int set_machine_constraints(struct regulator_dev *rdev, | |
823 | struct regulation_constraints *constraints) | |
824 | { | |
825 | int ret = 0; | |
826 | const char *name; | |
827 | struct regulator_ops *ops = rdev->desc->ops; | |
828 | ||
af5866c9 MB |
829 | rdev->constraints = constraints; |
830 | ||
1083c393 MB |
831 | name = rdev_get_name(rdev); |
832 | ||
833 | ret = machine_constraints_voltage(rdev, constraints); | |
e79055d6 MB |
834 | if (ret != 0) |
835 | goto out; | |
836 | ||
a5766f11 | 837 | /* do we need to setup our suspend state */ |
e06f5b4f | 838 | if (constraints->initial_state) { |
a5766f11 | 839 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
840 | if (ret < 0) { |
841 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
842 | __func__, name); | |
843 | rdev->constraints = NULL; | |
844 | goto out; | |
845 | } | |
846 | } | |
a5766f11 | 847 | |
a308466c MB |
848 | if (constraints->initial_mode) { |
849 | if (!ops->set_mode) { | |
850 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
851 | __func__, name); | |
852 | ret = -EINVAL; | |
853 | goto out; | |
854 | } | |
855 | ||
856 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
857 | if (ret < 0) { | |
858 | printk(KERN_ERR | |
859 | "%s: failed to set initial mode for %s: %d\n", | |
860 | __func__, name, ret); | |
861 | goto out; | |
862 | } | |
863 | } | |
864 | ||
cacf90f2 MB |
865 | /* If the constraints say the regulator should be on at this point |
866 | * and we have control then make sure it is enabled. | |
867 | */ | |
868 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
869 | ret = ops->enable(rdev); |
870 | if (ret < 0) { | |
871 | printk(KERN_ERR "%s: failed to enable %s\n", | |
872 | __func__, name); | |
873 | rdev->constraints = NULL; | |
874 | goto out; | |
875 | } | |
876 | } | |
877 | ||
a5766f11 LG |
878 | print_constraints(rdev); |
879 | out: | |
880 | return ret; | |
881 | } | |
882 | ||
883 | /** | |
884 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
885 | * @rdev: regulator name |
886 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
887 | * |
888 | * Called by platform initialisation code to set the supply regulator for this | |
889 | * regulator. This ensures that a regulators supply will also be enabled by the | |
890 | * core if it's child is enabled. | |
891 | */ | |
892 | static int set_supply(struct regulator_dev *rdev, | |
893 | struct regulator_dev *supply_rdev) | |
894 | { | |
895 | int err; | |
896 | ||
897 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
898 | "supply"); | |
899 | if (err) { | |
900 | printk(KERN_ERR | |
901 | "%s: could not add device link %s err %d\n", | |
902 | __func__, supply_rdev->dev.kobj.name, err); | |
903 | goto out; | |
904 | } | |
905 | rdev->supply = supply_rdev; | |
906 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
907 | out: | |
908 | return err; | |
909 | } | |
910 | ||
911 | /** | |
912 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
913 | * @rdev: regulator source |
914 | * @consumer_dev: device the supply applies to | |
40f9244f | 915 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 916 | * @supply: symbolic name for supply |
a5766f11 LG |
917 | * |
918 | * Allows platform initialisation code to map physical regulator | |
919 | * sources to symbolic names for supplies for use by devices. Devices | |
920 | * should use these symbolic names to request regulators, avoiding the | |
921 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
922 | * |
923 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
924 | */ |
925 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
926 | struct device *consumer_dev, const char *consumer_dev_name, |
927 | const char *supply) | |
a5766f11 LG |
928 | { |
929 | struct regulator_map *node; | |
9ed2099e | 930 | int has_dev; |
a5766f11 | 931 | |
40f9244f MB |
932 | if (consumer_dev && consumer_dev_name) |
933 | return -EINVAL; | |
934 | ||
935 | if (!consumer_dev_name && consumer_dev) | |
936 | consumer_dev_name = dev_name(consumer_dev); | |
937 | ||
a5766f11 LG |
938 | if (supply == NULL) |
939 | return -EINVAL; | |
940 | ||
9ed2099e MB |
941 | if (consumer_dev_name != NULL) |
942 | has_dev = 1; | |
943 | else | |
944 | has_dev = 0; | |
945 | ||
6001e13c | 946 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
947 | if (node->dev_name && consumer_dev_name) { |
948 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
949 | continue; | |
950 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 951 | continue; |
23b5cc2a JN |
952 | } |
953 | ||
6001e13c DB |
954 | if (strcmp(node->supply, supply) != 0) |
955 | continue; | |
956 | ||
957 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
958 | dev_name(&node->regulator->dev), | |
959 | node->regulator->desc->name, | |
960 | supply, | |
1083c393 | 961 | dev_name(&rdev->dev), rdev_get_name(rdev)); |
6001e13c DB |
962 | return -EBUSY; |
963 | } | |
964 | ||
9ed2099e | 965 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
966 | if (node == NULL) |
967 | return -ENOMEM; | |
968 | ||
969 | node->regulator = rdev; | |
a5766f11 LG |
970 | node->supply = supply; |
971 | ||
9ed2099e MB |
972 | if (has_dev) { |
973 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
974 | if (node->dev_name == NULL) { | |
975 | kfree(node); | |
976 | return -ENOMEM; | |
977 | } | |
40f9244f MB |
978 | } |
979 | ||
a5766f11 LG |
980 | list_add(&node->list, ®ulator_map_list); |
981 | return 0; | |
982 | } | |
983 | ||
0f1d747b MR |
984 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
985 | { | |
986 | struct regulator_map *node, *n; | |
987 | ||
988 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
989 | if (rdev == node->regulator) { | |
990 | list_del(&node->list); | |
40f9244f | 991 | kfree(node->dev_name); |
0f1d747b | 992 | kfree(node); |
0f1d747b MR |
993 | } |
994 | } | |
995 | } | |
996 | ||
414c70cb LG |
997 | #define REG_STR_SIZE 32 |
998 | ||
999 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1000 | struct device *dev, | |
1001 | const char *supply_name) | |
1002 | { | |
1003 | struct regulator *regulator; | |
1004 | char buf[REG_STR_SIZE]; | |
1005 | int err, size; | |
1006 | ||
1007 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1008 | if (regulator == NULL) | |
1009 | return NULL; | |
1010 | ||
1011 | mutex_lock(&rdev->mutex); | |
1012 | regulator->rdev = rdev; | |
1013 | list_add(®ulator->list, &rdev->consumer_list); | |
1014 | ||
1015 | if (dev) { | |
1016 | /* create a 'requested_microamps_name' sysfs entry */ | |
1017 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1018 | supply_name); | |
1019 | if (size >= REG_STR_SIZE) | |
1020 | goto overflow_err; | |
1021 | ||
1022 | regulator->dev = dev; | |
4f26a2ab | 1023 | sysfs_attr_init(®ulator->dev_attr.attr); |
414c70cb LG |
1024 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); |
1025 | if (regulator->dev_attr.attr.name == NULL) | |
1026 | goto attr_name_err; | |
1027 | ||
414c70cb LG |
1028 | regulator->dev_attr.attr.mode = 0444; |
1029 | regulator->dev_attr.show = device_requested_uA_show; | |
1030 | err = device_create_file(dev, ®ulator->dev_attr); | |
1031 | if (err < 0) { | |
1032 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
1033 | " load sysfs\n", __func__); | |
1034 | goto attr_name_err; | |
1035 | } | |
1036 | ||
1037 | /* also add a link to the device sysfs entry */ | |
1038 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1039 | dev->kobj.name, supply_name); | |
1040 | if (size >= REG_STR_SIZE) | |
1041 | goto attr_err; | |
1042 | ||
1043 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1044 | if (regulator->supply_name == NULL) | |
1045 | goto attr_err; | |
1046 | ||
1047 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1048 | buf); | |
1049 | if (err) { | |
1050 | printk(KERN_WARNING | |
1051 | "%s: could not add device link %s err %d\n", | |
1052 | __func__, dev->kobj.name, err); | |
1053 | device_remove_file(dev, ®ulator->dev_attr); | |
1054 | goto link_name_err; | |
1055 | } | |
1056 | } | |
1057 | mutex_unlock(&rdev->mutex); | |
1058 | return regulator; | |
1059 | link_name_err: | |
1060 | kfree(regulator->supply_name); | |
1061 | attr_err: | |
1062 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1063 | attr_name_err: | |
1064 | kfree(regulator->dev_attr.attr.name); | |
1065 | overflow_err: | |
1066 | list_del(®ulator->list); | |
1067 | kfree(regulator); | |
1068 | mutex_unlock(&rdev->mutex); | |
1069 | return NULL; | |
1070 | } | |
1071 | ||
31aae2be MB |
1072 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1073 | { | |
1074 | if (!rdev->desc->ops->enable_time) | |
1075 | return 0; | |
1076 | return rdev->desc->ops->enable_time(rdev); | |
1077 | } | |
1078 | ||
5ffbd136 MB |
1079 | /* Internal regulator request function */ |
1080 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1081 | int exclusive) | |
414c70cb LG |
1082 | { |
1083 | struct regulator_dev *rdev; | |
1084 | struct regulator_map *map; | |
1085 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1086 | const char *devname = NULL; |
5ffbd136 | 1087 | int ret; |
414c70cb LG |
1088 | |
1089 | if (id == NULL) { | |
1090 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1091 | return regulator; | |
1092 | } | |
1093 | ||
40f9244f MB |
1094 | if (dev) |
1095 | devname = dev_name(dev); | |
1096 | ||
414c70cb LG |
1097 | mutex_lock(®ulator_list_mutex); |
1098 | ||
1099 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1100 | /* If the mapping has a device set up it must match */ |
1101 | if (map->dev_name && | |
1102 | (!devname || strcmp(map->dev_name, devname))) | |
1103 | continue; | |
1104 | ||
1105 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1106 | rdev = map->regulator; |
414c70cb | 1107 | goto found; |
a5766f11 | 1108 | } |
414c70cb | 1109 | } |
34abbd68 MB |
1110 | |
1111 | #ifdef CONFIG_REGULATOR_DUMMY | |
1112 | if (!devname) | |
1113 | devname = "deviceless"; | |
1114 | ||
1115 | /* If the board didn't flag that it was fully constrained then | |
1116 | * substitute in a dummy regulator so consumers can continue. | |
1117 | */ | |
1118 | if (!has_full_constraints) { | |
1119 | pr_warning("%s supply %s not found, using dummy regulator\n", | |
1120 | devname, id); | |
1121 | rdev = dummy_regulator_rdev; | |
1122 | goto found; | |
1123 | } | |
1124 | #endif | |
1125 | ||
414c70cb LG |
1126 | mutex_unlock(®ulator_list_mutex); |
1127 | return regulator; | |
1128 | ||
1129 | found: | |
5ffbd136 MB |
1130 | if (rdev->exclusive) { |
1131 | regulator = ERR_PTR(-EPERM); | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | if (exclusive && rdev->open_count) { | |
1136 | regulator = ERR_PTR(-EBUSY); | |
1137 | goto out; | |
1138 | } | |
1139 | ||
a5766f11 LG |
1140 | if (!try_module_get(rdev->owner)) |
1141 | goto out; | |
1142 | ||
414c70cb LG |
1143 | regulator = create_regulator(rdev, dev, id); |
1144 | if (regulator == NULL) { | |
1145 | regulator = ERR_PTR(-ENOMEM); | |
1146 | module_put(rdev->owner); | |
1147 | } | |
1148 | ||
5ffbd136 MB |
1149 | rdev->open_count++; |
1150 | if (exclusive) { | |
1151 | rdev->exclusive = 1; | |
1152 | ||
1153 | ret = _regulator_is_enabled(rdev); | |
1154 | if (ret > 0) | |
1155 | rdev->use_count = 1; | |
1156 | else | |
1157 | rdev->use_count = 0; | |
1158 | } | |
1159 | ||
a5766f11 | 1160 | out: |
414c70cb | 1161 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1162 | |
414c70cb LG |
1163 | return regulator; |
1164 | } | |
5ffbd136 MB |
1165 | |
1166 | /** | |
1167 | * regulator_get - lookup and obtain a reference to a regulator. | |
1168 | * @dev: device for regulator "consumer" | |
1169 | * @id: Supply name or regulator ID. | |
1170 | * | |
1171 | * Returns a struct regulator corresponding to the regulator producer, | |
1172 | * or IS_ERR() condition containing errno. | |
1173 | * | |
1174 | * Use of supply names configured via regulator_set_device_supply() is | |
1175 | * strongly encouraged. It is recommended that the supply name used | |
1176 | * should match the name used for the supply and/or the relevant | |
1177 | * device pins in the datasheet. | |
1178 | */ | |
1179 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1180 | { | |
1181 | return _regulator_get(dev, id, 0); | |
1182 | } | |
414c70cb LG |
1183 | EXPORT_SYMBOL_GPL(regulator_get); |
1184 | ||
5ffbd136 MB |
1185 | /** |
1186 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1187 | * @dev: device for regulator "consumer" | |
1188 | * @id: Supply name or regulator ID. | |
1189 | * | |
1190 | * Returns a struct regulator corresponding to the regulator producer, | |
1191 | * or IS_ERR() condition containing errno. Other consumers will be | |
1192 | * unable to obtain this reference is held and the use count for the | |
1193 | * regulator will be initialised to reflect the current state of the | |
1194 | * regulator. | |
1195 | * | |
1196 | * This is intended for use by consumers which cannot tolerate shared | |
1197 | * use of the regulator such as those which need to force the | |
1198 | * regulator off for correct operation of the hardware they are | |
1199 | * controlling. | |
1200 | * | |
1201 | * Use of supply names configured via regulator_set_device_supply() is | |
1202 | * strongly encouraged. It is recommended that the supply name used | |
1203 | * should match the name used for the supply and/or the relevant | |
1204 | * device pins in the datasheet. | |
1205 | */ | |
1206 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1207 | { | |
1208 | return _regulator_get(dev, id, 1); | |
1209 | } | |
1210 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1211 | ||
414c70cb LG |
1212 | /** |
1213 | * regulator_put - "free" the regulator source | |
1214 | * @regulator: regulator source | |
1215 | * | |
1216 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1217 | * regulator source are balanced by regulator_disable calls prior to calling | |
1218 | * this function. | |
1219 | */ | |
1220 | void regulator_put(struct regulator *regulator) | |
1221 | { | |
1222 | struct regulator_dev *rdev; | |
1223 | ||
1224 | if (regulator == NULL || IS_ERR(regulator)) | |
1225 | return; | |
1226 | ||
414c70cb LG |
1227 | mutex_lock(®ulator_list_mutex); |
1228 | rdev = regulator->rdev; | |
1229 | ||
1230 | /* remove any sysfs entries */ | |
1231 | if (regulator->dev) { | |
1232 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1233 | kfree(regulator->supply_name); | |
1234 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1235 | kfree(regulator->dev_attr.attr.name); | |
1236 | } | |
1237 | list_del(®ulator->list); | |
1238 | kfree(regulator); | |
1239 | ||
5ffbd136 MB |
1240 | rdev->open_count--; |
1241 | rdev->exclusive = 0; | |
1242 | ||
414c70cb LG |
1243 | module_put(rdev->owner); |
1244 | mutex_unlock(®ulator_list_mutex); | |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(regulator_put); | |
1247 | ||
9a2372fa MB |
1248 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1249 | { | |
1250 | if (!rdev->constraints) | |
1251 | return 0; | |
1252 | ||
1253 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1254 | return 1; | |
1255 | else | |
1256 | return 0; | |
1257 | } | |
1258 | ||
414c70cb LG |
1259 | /* locks held by regulator_enable() */ |
1260 | static int _regulator_enable(struct regulator_dev *rdev) | |
1261 | { | |
31aae2be | 1262 | int ret, delay; |
414c70cb LG |
1263 | |
1264 | /* do we need to enable the supply regulator first */ | |
1265 | if (rdev->supply) { | |
1266 | ret = _regulator_enable(rdev->supply); | |
1267 | if (ret < 0) { | |
1268 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1083c393 | 1269 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1270 | return ret; |
1271 | } | |
1272 | } | |
1273 | ||
1274 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1275 | if (rdev->constraints && |
1276 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1277 | drms_uA_update(rdev); | |
414c70cb | 1278 | |
9a2372fa MB |
1279 | if (rdev->use_count == 0) { |
1280 | /* The regulator may on if it's not switchable or left on */ | |
1281 | ret = _regulator_is_enabled(rdev); | |
1282 | if (ret == -EINVAL || ret == 0) { | |
1283 | if (!_regulator_can_change_status(rdev)) | |
1284 | return -EPERM; | |
1285 | ||
31aae2be | 1286 | if (!rdev->desc->ops->enable) |
9a2372fa | 1287 | return -EINVAL; |
31aae2be MB |
1288 | |
1289 | /* Query before enabling in case configuration | |
1290 | * dependant. */ | |
1291 | ret = _regulator_get_enable_time(rdev); | |
1292 | if (ret >= 0) { | |
1293 | delay = ret; | |
1294 | } else { | |
1295 | printk(KERN_WARNING | |
1296 | "%s: enable_time() failed for %s: %d\n", | |
1297 | __func__, rdev_get_name(rdev), | |
1298 | ret); | |
1299 | delay = 0; | |
9a2372fa | 1300 | } |
31aae2be MB |
1301 | |
1302 | /* Allow the regulator to ramp; it would be useful | |
1303 | * to extend this for bulk operations so that the | |
1304 | * regulators can ramp together. */ | |
1305 | ret = rdev->desc->ops->enable(rdev); | |
1306 | if (ret < 0) | |
1307 | return ret; | |
1308 | ||
1309 | if (delay >= 1000) | |
1310 | mdelay(delay / 1000); | |
1311 | else if (delay) | |
1312 | udelay(delay); | |
1313 | ||
a7433cff | 1314 | } else if (ret < 0) { |
9a2372fa | 1315 | printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", |
1083c393 | 1316 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1317 | return ret; |
1318 | } | |
a7433cff | 1319 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1320 | } |
1321 | ||
9a2372fa MB |
1322 | rdev->use_count++; |
1323 | ||
1324 | return 0; | |
414c70cb LG |
1325 | } |
1326 | ||
1327 | /** | |
1328 | * regulator_enable - enable regulator output | |
1329 | * @regulator: regulator source | |
1330 | * | |
cf7bbcdf MB |
1331 | * Request that the regulator be enabled with the regulator output at |
1332 | * the predefined voltage or current value. Calls to regulator_enable() | |
1333 | * must be balanced with calls to regulator_disable(). | |
1334 | * | |
414c70cb | 1335 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1336 | * hardwired in the regulator. |
414c70cb LG |
1337 | */ |
1338 | int regulator_enable(struct regulator *regulator) | |
1339 | { | |
412aec61 DB |
1340 | struct regulator_dev *rdev = regulator->rdev; |
1341 | int ret = 0; | |
414c70cb | 1342 | |
412aec61 | 1343 | mutex_lock(&rdev->mutex); |
cd94b505 | 1344 | ret = _regulator_enable(rdev); |
412aec61 | 1345 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1346 | return ret; |
1347 | } | |
1348 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1349 | ||
1350 | /* locks held by regulator_disable() */ | |
1351 | static int _regulator_disable(struct regulator_dev *rdev) | |
1352 | { | |
1353 | int ret = 0; | |
1354 | ||
cd94b505 DB |
1355 | if (WARN(rdev->use_count <= 0, |
1356 | "unbalanced disables for %s\n", | |
1083c393 | 1357 | rdev_get_name(rdev))) |
cd94b505 DB |
1358 | return -EIO; |
1359 | ||
414c70cb | 1360 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1361 | if (rdev->use_count == 1 && |
1362 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1363 | |
1364 | /* we are last user */ | |
9a2372fa MB |
1365 | if (_regulator_can_change_status(rdev) && |
1366 | rdev->desc->ops->disable) { | |
414c70cb LG |
1367 | ret = rdev->desc->ops->disable(rdev); |
1368 | if (ret < 0) { | |
1369 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1083c393 | 1370 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1371 | return ret; |
1372 | } | |
84b68263 MB |
1373 | |
1374 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1375 | NULL); | |
414c70cb LG |
1376 | } |
1377 | ||
1378 | /* decrease our supplies ref count and disable if required */ | |
1379 | if (rdev->supply) | |
1380 | _regulator_disable(rdev->supply); | |
1381 | ||
1382 | rdev->use_count = 0; | |
1383 | } else if (rdev->use_count > 1) { | |
1384 | ||
1385 | if (rdev->constraints && | |
1386 | (rdev->constraints->valid_ops_mask & | |
1387 | REGULATOR_CHANGE_DRMS)) | |
1388 | drms_uA_update(rdev); | |
1389 | ||
1390 | rdev->use_count--; | |
1391 | } | |
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * regulator_disable - disable regulator output | |
1397 | * @regulator: regulator source | |
1398 | * | |
cf7bbcdf MB |
1399 | * Disable the regulator output voltage or current. Calls to |
1400 | * regulator_enable() must be balanced with calls to | |
1401 | * regulator_disable(). | |
69279fb9 | 1402 | * |
414c70cb | 1403 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1404 | * devices have it enabled, the regulator device supports disabling and |
1405 | * machine constraints permit this operation. | |
414c70cb LG |
1406 | */ |
1407 | int regulator_disable(struct regulator *regulator) | |
1408 | { | |
412aec61 DB |
1409 | struct regulator_dev *rdev = regulator->rdev; |
1410 | int ret = 0; | |
414c70cb | 1411 | |
412aec61 | 1412 | mutex_lock(&rdev->mutex); |
cd94b505 | 1413 | ret = _regulator_disable(rdev); |
412aec61 | 1414 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1415 | return ret; |
1416 | } | |
1417 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1418 | ||
1419 | /* locks held by regulator_force_disable() */ | |
1420 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1421 | { | |
1422 | int ret = 0; | |
1423 | ||
1424 | /* force disable */ | |
1425 | if (rdev->desc->ops->disable) { | |
1426 | /* ah well, who wants to live forever... */ | |
1427 | ret = rdev->desc->ops->disable(rdev); | |
1428 | if (ret < 0) { | |
1429 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1083c393 | 1430 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1431 | return ret; |
1432 | } | |
1433 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1434 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1435 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1436 | } |
1437 | ||
1438 | /* decrease our supplies ref count and disable if required */ | |
1439 | if (rdev->supply) | |
1440 | _regulator_disable(rdev->supply); | |
1441 | ||
1442 | rdev->use_count = 0; | |
1443 | return ret; | |
1444 | } | |
1445 | ||
1446 | /** | |
1447 | * regulator_force_disable - force disable regulator output | |
1448 | * @regulator: regulator source | |
1449 | * | |
1450 | * Forcibly disable the regulator output voltage or current. | |
1451 | * NOTE: this *will* disable the regulator output even if other consumer | |
1452 | * devices have it enabled. This should be used for situations when device | |
1453 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1454 | */ | |
1455 | int regulator_force_disable(struct regulator *regulator) | |
1456 | { | |
1457 | int ret; | |
1458 | ||
1459 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1460 | regulator->uA_load = 0; |
1461 | ret = _regulator_force_disable(regulator->rdev); | |
1462 | mutex_unlock(®ulator->rdev->mutex); | |
1463 | return ret; | |
1464 | } | |
1465 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1466 | ||
1467 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1468 | { | |
9a7f6a4c | 1469 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 1470 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 1471 | return 1; |
414c70cb | 1472 | |
9332546f | 1473 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1474 | } |
1475 | ||
1476 | /** | |
1477 | * regulator_is_enabled - is the regulator output enabled | |
1478 | * @regulator: regulator source | |
1479 | * | |
412aec61 DB |
1480 | * Returns positive if the regulator driver backing the source/client |
1481 | * has requested that the device be enabled, zero if it hasn't, else a | |
1482 | * negative errno code. | |
1483 | * | |
1484 | * Note that the device backing this regulator handle can have multiple | |
1485 | * users, so it might be enabled even if regulator_enable() was never | |
1486 | * called for this particular source. | |
414c70cb LG |
1487 | */ |
1488 | int regulator_is_enabled(struct regulator *regulator) | |
1489 | { | |
9332546f MB |
1490 | int ret; |
1491 | ||
1492 | mutex_lock(®ulator->rdev->mutex); | |
1493 | ret = _regulator_is_enabled(regulator->rdev); | |
1494 | mutex_unlock(®ulator->rdev->mutex); | |
1495 | ||
1496 | return ret; | |
414c70cb LG |
1497 | } |
1498 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1499 | ||
4367cfdc DB |
1500 | /** |
1501 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1502 | * @regulator: regulator source | |
1503 | * | |
1504 | * Returns number of selectors, or negative errno. Selectors are | |
1505 | * numbered starting at zero, and typically correspond to bitfields | |
1506 | * in hardware registers. | |
1507 | */ | |
1508 | int regulator_count_voltages(struct regulator *regulator) | |
1509 | { | |
1510 | struct regulator_dev *rdev = regulator->rdev; | |
1511 | ||
1512 | return rdev->desc->n_voltages ? : -EINVAL; | |
1513 | } | |
1514 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1515 | ||
1516 | /** | |
1517 | * regulator_list_voltage - enumerate supported voltages | |
1518 | * @regulator: regulator source | |
1519 | * @selector: identify voltage to list | |
1520 | * Context: can sleep | |
1521 | * | |
1522 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 1523 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
1524 | * negative errno. |
1525 | */ | |
1526 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1527 | { | |
1528 | struct regulator_dev *rdev = regulator->rdev; | |
1529 | struct regulator_ops *ops = rdev->desc->ops; | |
1530 | int ret; | |
1531 | ||
1532 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1533 | return -EINVAL; | |
1534 | ||
1535 | mutex_lock(&rdev->mutex); | |
1536 | ret = ops->list_voltage(rdev, selector); | |
1537 | mutex_unlock(&rdev->mutex); | |
1538 | ||
1539 | if (ret > 0) { | |
1540 | if (ret < rdev->constraints->min_uV) | |
1541 | ret = 0; | |
1542 | else if (ret > rdev->constraints->max_uV) | |
1543 | ret = 0; | |
1544 | } | |
1545 | ||
1546 | return ret; | |
1547 | } | |
1548 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1549 | ||
a7a1ad90 MB |
1550 | /** |
1551 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1552 | * | |
1553 | * @regulator: Regulator to check. | |
1554 | * @min_uV: Minimum required voltage in uV. | |
1555 | * @max_uV: Maximum required voltage in uV. | |
1556 | * | |
1557 | * Returns a boolean or a negative error code. | |
1558 | */ | |
1559 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1560 | int min_uV, int max_uV) | |
1561 | { | |
1562 | int i, voltages, ret; | |
1563 | ||
1564 | ret = regulator_count_voltages(regulator); | |
1565 | if (ret < 0) | |
1566 | return ret; | |
1567 | voltages = ret; | |
1568 | ||
1569 | for (i = 0; i < voltages; i++) { | |
1570 | ret = regulator_list_voltage(regulator, i); | |
1571 | ||
1572 | if (ret >= min_uV && ret <= max_uV) | |
1573 | return 1; | |
1574 | } | |
1575 | ||
1576 | return 0; | |
1577 | } | |
1578 | ||
414c70cb LG |
1579 | /** |
1580 | * regulator_set_voltage - set regulator output voltage | |
1581 | * @regulator: regulator source | |
1582 | * @min_uV: Minimum required voltage in uV | |
1583 | * @max_uV: Maximum acceptable voltage in uV | |
1584 | * | |
1585 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1586 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1587 | * | |
1588 | * If the regulator is enabled then the voltage will change to the new value | |
1589 | * immediately otherwise if the regulator is disabled the regulator will | |
1590 | * output at the new voltage when enabled. | |
1591 | * | |
1592 | * NOTE: If the regulator is shared between several devices then the lowest | |
1593 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1594 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1595 | * calling this function otherwise this call will fail. |
1596 | */ | |
1597 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1598 | { | |
1599 | struct regulator_dev *rdev = regulator->rdev; | |
1600 | int ret; | |
1601 | ||
1602 | mutex_lock(&rdev->mutex); | |
1603 | ||
1604 | /* sanity check */ | |
1605 | if (!rdev->desc->ops->set_voltage) { | |
1606 | ret = -EINVAL; | |
1607 | goto out; | |
1608 | } | |
1609 | ||
1610 | /* constraints check */ | |
1611 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1612 | if (ret < 0) | |
1613 | goto out; | |
1614 | regulator->min_uV = min_uV; | |
1615 | regulator->max_uV = max_uV; | |
1616 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1617 | ||
1618 | out: | |
b136fb44 | 1619 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1620 | mutex_unlock(&rdev->mutex); |
1621 | return ret; | |
1622 | } | |
1623 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1624 | ||
1625 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1626 | { | |
1627 | /* sanity check */ | |
1628 | if (rdev->desc->ops->get_voltage) | |
1629 | return rdev->desc->ops->get_voltage(rdev); | |
1630 | else | |
1631 | return -EINVAL; | |
1632 | } | |
1633 | ||
1634 | /** | |
1635 | * regulator_get_voltage - get regulator output voltage | |
1636 | * @regulator: regulator source | |
1637 | * | |
1638 | * This returns the current regulator voltage in uV. | |
1639 | * | |
1640 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1641 | * function should not be used to determine regulator state. | |
1642 | */ | |
1643 | int regulator_get_voltage(struct regulator *regulator) | |
1644 | { | |
1645 | int ret; | |
1646 | ||
1647 | mutex_lock(®ulator->rdev->mutex); | |
1648 | ||
1649 | ret = _regulator_get_voltage(regulator->rdev); | |
1650 | ||
1651 | mutex_unlock(®ulator->rdev->mutex); | |
1652 | ||
1653 | return ret; | |
1654 | } | |
1655 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1656 | ||
1657 | /** | |
1658 | * regulator_set_current_limit - set regulator output current limit | |
1659 | * @regulator: regulator source | |
1660 | * @min_uA: Minimuum supported current in uA | |
1661 | * @max_uA: Maximum supported current in uA | |
1662 | * | |
1663 | * Sets current sink to the desired output current. This can be set during | |
1664 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1665 | * | |
1666 | * If the regulator is enabled then the current will change to the new value | |
1667 | * immediately otherwise if the regulator is disabled the regulator will | |
1668 | * output at the new current when enabled. | |
1669 | * | |
1670 | * NOTE: Regulator system constraints must be set for this regulator before | |
1671 | * calling this function otherwise this call will fail. | |
1672 | */ | |
1673 | int regulator_set_current_limit(struct regulator *regulator, | |
1674 | int min_uA, int max_uA) | |
1675 | { | |
1676 | struct regulator_dev *rdev = regulator->rdev; | |
1677 | int ret; | |
1678 | ||
1679 | mutex_lock(&rdev->mutex); | |
1680 | ||
1681 | /* sanity check */ | |
1682 | if (!rdev->desc->ops->set_current_limit) { | |
1683 | ret = -EINVAL; | |
1684 | goto out; | |
1685 | } | |
1686 | ||
1687 | /* constraints check */ | |
1688 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1689 | if (ret < 0) | |
1690 | goto out; | |
1691 | ||
1692 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1693 | out: | |
1694 | mutex_unlock(&rdev->mutex); | |
1695 | return ret; | |
1696 | } | |
1697 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1698 | ||
1699 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1700 | { | |
1701 | int ret; | |
1702 | ||
1703 | mutex_lock(&rdev->mutex); | |
1704 | ||
1705 | /* sanity check */ | |
1706 | if (!rdev->desc->ops->get_current_limit) { | |
1707 | ret = -EINVAL; | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1712 | out: | |
1713 | mutex_unlock(&rdev->mutex); | |
1714 | return ret; | |
1715 | } | |
1716 | ||
1717 | /** | |
1718 | * regulator_get_current_limit - get regulator output current | |
1719 | * @regulator: regulator source | |
1720 | * | |
1721 | * This returns the current supplied by the specified current sink in uA. | |
1722 | * | |
1723 | * NOTE: If the regulator is disabled it will return the current value. This | |
1724 | * function should not be used to determine regulator state. | |
1725 | */ | |
1726 | int regulator_get_current_limit(struct regulator *regulator) | |
1727 | { | |
1728 | return _regulator_get_current_limit(regulator->rdev); | |
1729 | } | |
1730 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1731 | ||
1732 | /** | |
1733 | * regulator_set_mode - set regulator operating mode | |
1734 | * @regulator: regulator source | |
1735 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1736 | * | |
1737 | * Set regulator operating mode to increase regulator efficiency or improve | |
1738 | * regulation performance. | |
1739 | * | |
1740 | * NOTE: Regulator system constraints must be set for this regulator before | |
1741 | * calling this function otherwise this call will fail. | |
1742 | */ | |
1743 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1744 | { | |
1745 | struct regulator_dev *rdev = regulator->rdev; | |
1746 | int ret; | |
500b4ac9 | 1747 | int regulator_curr_mode; |
414c70cb LG |
1748 | |
1749 | mutex_lock(&rdev->mutex); | |
1750 | ||
1751 | /* sanity check */ | |
1752 | if (!rdev->desc->ops->set_mode) { | |
1753 | ret = -EINVAL; | |
1754 | goto out; | |
1755 | } | |
1756 | ||
500b4ac9 SI |
1757 | /* return if the same mode is requested */ |
1758 | if (rdev->desc->ops->get_mode) { | |
1759 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
1760 | if (regulator_curr_mode == mode) { | |
1761 | ret = 0; | |
1762 | goto out; | |
1763 | } | |
1764 | } | |
1765 | ||
414c70cb LG |
1766 | /* constraints check */ |
1767 | ret = regulator_check_mode(rdev, mode); | |
1768 | if (ret < 0) | |
1769 | goto out; | |
1770 | ||
1771 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1772 | out: | |
1773 | mutex_unlock(&rdev->mutex); | |
1774 | return ret; | |
1775 | } | |
1776 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1777 | ||
1778 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1779 | { | |
1780 | int ret; | |
1781 | ||
1782 | mutex_lock(&rdev->mutex); | |
1783 | ||
1784 | /* sanity check */ | |
1785 | if (!rdev->desc->ops->get_mode) { | |
1786 | ret = -EINVAL; | |
1787 | goto out; | |
1788 | } | |
1789 | ||
1790 | ret = rdev->desc->ops->get_mode(rdev); | |
1791 | out: | |
1792 | mutex_unlock(&rdev->mutex); | |
1793 | return ret; | |
1794 | } | |
1795 | ||
1796 | /** | |
1797 | * regulator_get_mode - get regulator operating mode | |
1798 | * @regulator: regulator source | |
1799 | * | |
1800 | * Get the current regulator operating mode. | |
1801 | */ | |
1802 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1803 | { | |
1804 | return _regulator_get_mode(regulator->rdev); | |
1805 | } | |
1806 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1807 | ||
1808 | /** | |
1809 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1810 | * @regulator: regulator source | |
1811 | * @uA_load: load current | |
1812 | * | |
1813 | * Notifies the regulator core of a new device load. This is then used by | |
1814 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1815 | * operating mode for the new regulator loading. | |
1816 | * | |
1817 | * Consumer devices notify their supply regulator of the maximum power | |
1818 | * they will require (can be taken from device datasheet in the power | |
1819 | * consumption tables) when they change operational status and hence power | |
1820 | * state. Examples of operational state changes that can affect power | |
1821 | * consumption are :- | |
1822 | * | |
1823 | * o Device is opened / closed. | |
1824 | * o Device I/O is about to begin or has just finished. | |
1825 | * o Device is idling in between work. | |
1826 | * | |
1827 | * This information is also exported via sysfs to userspace. | |
1828 | * | |
1829 | * DRMS will sum the total requested load on the regulator and change | |
1830 | * to the most efficient operating mode if platform constraints allow. | |
1831 | * | |
1832 | * Returns the new regulator mode or error. | |
1833 | */ | |
1834 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1835 | { | |
1836 | struct regulator_dev *rdev = regulator->rdev; | |
1837 | struct regulator *consumer; | |
1838 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1839 | unsigned int mode; | |
1840 | ||
1841 | mutex_lock(&rdev->mutex); | |
1842 | ||
1843 | regulator->uA_load = uA_load; | |
1844 | ret = regulator_check_drms(rdev); | |
1845 | if (ret < 0) | |
1846 | goto out; | |
1847 | ret = -EINVAL; | |
1848 | ||
1849 | /* sanity check */ | |
1850 | if (!rdev->desc->ops->get_optimum_mode) | |
1851 | goto out; | |
1852 | ||
1853 | /* get output voltage */ | |
1854 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1855 | if (output_uV <= 0) { | |
1856 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1083c393 | 1857 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1858 | goto out; |
1859 | } | |
1860 | ||
1861 | /* get input voltage */ | |
1862 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1863 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1864 | else | |
1865 | input_uV = rdev->constraints->input_uV; | |
1866 | if (input_uV <= 0) { | |
1867 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1083c393 | 1868 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1869 | goto out; |
1870 | } | |
1871 | ||
1872 | /* calc total requested load for this regulator */ | |
1873 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 1874 | total_uA_load += consumer->uA_load; |
414c70cb LG |
1875 | |
1876 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1877 | input_uV, output_uV, | |
1878 | total_uA_load); | |
e573520b DB |
1879 | ret = regulator_check_mode(rdev, mode); |
1880 | if (ret < 0) { | |
414c70cb | 1881 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1083c393 | 1882 | " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), |
414c70cb LG |
1883 | total_uA_load, input_uV, output_uV); |
1884 | goto out; | |
1885 | } | |
1886 | ||
1887 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1888 | if (ret < 0) { |
414c70cb | 1889 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1083c393 | 1890 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
1891 | goto out; |
1892 | } | |
1893 | ret = mode; | |
1894 | out: | |
1895 | mutex_unlock(&rdev->mutex); | |
1896 | return ret; | |
1897 | } | |
1898 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1899 | ||
1900 | /** | |
1901 | * regulator_register_notifier - register regulator event notifier | |
1902 | * @regulator: regulator source | |
69279fb9 | 1903 | * @nb: notifier block |
414c70cb LG |
1904 | * |
1905 | * Register notifier block to receive regulator events. | |
1906 | */ | |
1907 | int regulator_register_notifier(struct regulator *regulator, | |
1908 | struct notifier_block *nb) | |
1909 | { | |
1910 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1911 | nb); | |
1912 | } | |
1913 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1914 | ||
1915 | /** | |
1916 | * regulator_unregister_notifier - unregister regulator event notifier | |
1917 | * @regulator: regulator source | |
69279fb9 | 1918 | * @nb: notifier block |
414c70cb LG |
1919 | * |
1920 | * Unregister regulator event notifier block. | |
1921 | */ | |
1922 | int regulator_unregister_notifier(struct regulator *regulator, | |
1923 | struct notifier_block *nb) | |
1924 | { | |
1925 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1926 | nb); | |
1927 | } | |
1928 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1929 | ||
b136fb44 JC |
1930 | /* notify regulator consumers and downstream regulator consumers. |
1931 | * Note mutex must be held by caller. | |
1932 | */ | |
414c70cb LG |
1933 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1934 | unsigned long event, void *data) | |
1935 | { | |
1936 | struct regulator_dev *_rdev; | |
1937 | ||
1938 | /* call rdev chain first */ | |
414c70cb | 1939 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1940 | |
1941 | /* now notify regulator we supply */ | |
b136fb44 | 1942 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
1943 | mutex_lock(&_rdev->mutex); |
1944 | _notifier_call_chain(_rdev, event, data); | |
1945 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 1946 | } |
414c70cb LG |
1947 | } |
1948 | ||
1949 | /** | |
1950 | * regulator_bulk_get - get multiple regulator consumers | |
1951 | * | |
1952 | * @dev: Device to supply | |
1953 | * @num_consumers: Number of consumers to register | |
1954 | * @consumers: Configuration of consumers; clients are stored here. | |
1955 | * | |
1956 | * @return 0 on success, an errno on failure. | |
1957 | * | |
1958 | * This helper function allows drivers to get several regulator | |
1959 | * consumers in one operation. If any of the regulators cannot be | |
1960 | * acquired then any regulators that were allocated will be freed | |
1961 | * before returning to the caller. | |
1962 | */ | |
1963 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1964 | struct regulator_bulk_data *consumers) | |
1965 | { | |
1966 | int i; | |
1967 | int ret; | |
1968 | ||
1969 | for (i = 0; i < num_consumers; i++) | |
1970 | consumers[i].consumer = NULL; | |
1971 | ||
1972 | for (i = 0; i < num_consumers; i++) { | |
1973 | consumers[i].consumer = regulator_get(dev, | |
1974 | consumers[i].supply); | |
1975 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 1976 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
1977 | dev_err(dev, "Failed to get supply '%s': %d\n", |
1978 | consumers[i].supply, ret); | |
414c70cb LG |
1979 | consumers[i].consumer = NULL; |
1980 | goto err; | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | return 0; | |
1985 | ||
1986 | err: | |
1987 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1988 | regulator_put(consumers[i].consumer); | |
1989 | ||
1990 | return ret; | |
1991 | } | |
1992 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1993 | ||
1994 | /** | |
1995 | * regulator_bulk_enable - enable multiple regulator consumers | |
1996 | * | |
1997 | * @num_consumers: Number of consumers | |
1998 | * @consumers: Consumer data; clients are stored here. | |
1999 | * @return 0 on success, an errno on failure | |
2000 | * | |
2001 | * This convenience API allows consumers to enable multiple regulator | |
2002 | * clients in a single API call. If any consumers cannot be enabled | |
2003 | * then any others that were enabled will be disabled again prior to | |
2004 | * return. | |
2005 | */ | |
2006 | int regulator_bulk_enable(int num_consumers, | |
2007 | struct regulator_bulk_data *consumers) | |
2008 | { | |
2009 | int i; | |
2010 | int ret; | |
2011 | ||
2012 | for (i = 0; i < num_consumers; i++) { | |
2013 | ret = regulator_enable(consumers[i].consumer); | |
2014 | if (ret != 0) | |
2015 | goto err; | |
2016 | } | |
2017 | ||
2018 | return 0; | |
2019 | ||
2020 | err: | |
5b307627 | 2021 | printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 2022 | for (--i; i >= 0; --i) |
414c70cb LG |
2023 | regulator_disable(consumers[i].consumer); |
2024 | ||
2025 | return ret; | |
2026 | } | |
2027 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
2028 | ||
2029 | /** | |
2030 | * regulator_bulk_disable - disable multiple regulator consumers | |
2031 | * | |
2032 | * @num_consumers: Number of consumers | |
2033 | * @consumers: Consumer data; clients are stored here. | |
2034 | * @return 0 on success, an errno on failure | |
2035 | * | |
2036 | * This convenience API allows consumers to disable multiple regulator | |
2037 | * clients in a single API call. If any consumers cannot be enabled | |
2038 | * then any others that were disabled will be disabled again prior to | |
2039 | * return. | |
2040 | */ | |
2041 | int regulator_bulk_disable(int num_consumers, | |
2042 | struct regulator_bulk_data *consumers) | |
2043 | { | |
2044 | int i; | |
2045 | int ret; | |
2046 | ||
2047 | for (i = 0; i < num_consumers; i++) { | |
2048 | ret = regulator_disable(consumers[i].consumer); | |
2049 | if (ret != 0) | |
2050 | goto err; | |
2051 | } | |
2052 | ||
2053 | return 0; | |
2054 | ||
2055 | err: | |
5b307627 MB |
2056 | printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, |
2057 | ret); | |
eb143ac1 | 2058 | for (--i; i >= 0; --i) |
414c70cb LG |
2059 | regulator_enable(consumers[i].consumer); |
2060 | ||
2061 | return ret; | |
2062 | } | |
2063 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2064 | ||
2065 | /** | |
2066 | * regulator_bulk_free - free multiple regulator consumers | |
2067 | * | |
2068 | * @num_consumers: Number of consumers | |
2069 | * @consumers: Consumer data; clients are stored here. | |
2070 | * | |
2071 | * This convenience API allows consumers to free multiple regulator | |
2072 | * clients in a single API call. | |
2073 | */ | |
2074 | void regulator_bulk_free(int num_consumers, | |
2075 | struct regulator_bulk_data *consumers) | |
2076 | { | |
2077 | int i; | |
2078 | ||
2079 | for (i = 0; i < num_consumers; i++) { | |
2080 | regulator_put(consumers[i].consumer); | |
2081 | consumers[i].consumer = NULL; | |
2082 | } | |
2083 | } | |
2084 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2085 | ||
2086 | /** | |
2087 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2088 | * @rdev: regulator source |
414c70cb | 2089 | * @event: notifier block |
69279fb9 | 2090 | * @data: callback-specific data. |
414c70cb LG |
2091 | * |
2092 | * Called by regulator drivers to notify clients a regulator event has | |
2093 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2094 | * Note lock must be held by caller. |
414c70cb LG |
2095 | */ |
2096 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2097 | unsigned long event, void *data) | |
2098 | { | |
2099 | _notifier_call_chain(rdev, event, data); | |
2100 | return NOTIFY_DONE; | |
2101 | ||
2102 | } | |
2103 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2104 | ||
be721979 MB |
2105 | /** |
2106 | * regulator_mode_to_status - convert a regulator mode into a status | |
2107 | * | |
2108 | * @mode: Mode to convert | |
2109 | * | |
2110 | * Convert a regulator mode into a status. | |
2111 | */ | |
2112 | int regulator_mode_to_status(unsigned int mode) | |
2113 | { | |
2114 | switch (mode) { | |
2115 | case REGULATOR_MODE_FAST: | |
2116 | return REGULATOR_STATUS_FAST; | |
2117 | case REGULATOR_MODE_NORMAL: | |
2118 | return REGULATOR_STATUS_NORMAL; | |
2119 | case REGULATOR_MODE_IDLE: | |
2120 | return REGULATOR_STATUS_IDLE; | |
2121 | case REGULATOR_STATUS_STANDBY: | |
2122 | return REGULATOR_STATUS_STANDBY; | |
2123 | default: | |
2124 | return 0; | |
2125 | } | |
2126 | } | |
2127 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2128 | ||
7ad68e2f DB |
2129 | /* |
2130 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2131 | * create attributes that can be meaningfully displayed. | |
2132 | */ | |
2133 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2134 | { | |
2135 | struct device *dev = &rdev->dev; | |
2136 | struct regulator_ops *ops = rdev->desc->ops; | |
2137 | int status = 0; | |
2138 | ||
2139 | /* some attributes need specific methods to be displayed */ | |
2140 | if (ops->get_voltage) { | |
2141 | status = device_create_file(dev, &dev_attr_microvolts); | |
2142 | if (status < 0) | |
2143 | return status; | |
2144 | } | |
2145 | if (ops->get_current_limit) { | |
2146 | status = device_create_file(dev, &dev_attr_microamps); | |
2147 | if (status < 0) | |
2148 | return status; | |
2149 | } | |
2150 | if (ops->get_mode) { | |
2151 | status = device_create_file(dev, &dev_attr_opmode); | |
2152 | if (status < 0) | |
2153 | return status; | |
2154 | } | |
2155 | if (ops->is_enabled) { | |
2156 | status = device_create_file(dev, &dev_attr_state); | |
2157 | if (status < 0) | |
2158 | return status; | |
2159 | } | |
853116a1 DB |
2160 | if (ops->get_status) { |
2161 | status = device_create_file(dev, &dev_attr_status); | |
2162 | if (status < 0) | |
2163 | return status; | |
2164 | } | |
7ad68e2f DB |
2165 | |
2166 | /* some attributes are type-specific */ | |
2167 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2168 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2169 | if (status < 0) | |
2170 | return status; | |
2171 | } | |
2172 | ||
2173 | /* all the other attributes exist to support constraints; | |
2174 | * don't show them if there are no constraints, or if the | |
2175 | * relevant supporting methods are missing. | |
2176 | */ | |
2177 | if (!rdev->constraints) | |
2178 | return status; | |
2179 | ||
2180 | /* constraints need specific supporting methods */ | |
2181 | if (ops->set_voltage) { | |
2182 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2183 | if (status < 0) | |
2184 | return status; | |
2185 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2186 | if (status < 0) | |
2187 | return status; | |
2188 | } | |
2189 | if (ops->set_current_limit) { | |
2190 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2191 | if (status < 0) | |
2192 | return status; | |
2193 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2194 | if (status < 0) | |
2195 | return status; | |
2196 | } | |
2197 | ||
2198 | /* suspend mode constraints need multiple supporting methods */ | |
2199 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2200 | return status; | |
2201 | ||
2202 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2203 | if (status < 0) | |
2204 | return status; | |
2205 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2206 | if (status < 0) | |
2207 | return status; | |
2208 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2209 | if (status < 0) | |
2210 | return status; | |
2211 | ||
2212 | if (ops->set_suspend_voltage) { | |
2213 | status = device_create_file(dev, | |
2214 | &dev_attr_suspend_standby_microvolts); | |
2215 | if (status < 0) | |
2216 | return status; | |
2217 | status = device_create_file(dev, | |
2218 | &dev_attr_suspend_mem_microvolts); | |
2219 | if (status < 0) | |
2220 | return status; | |
2221 | status = device_create_file(dev, | |
2222 | &dev_attr_suspend_disk_microvolts); | |
2223 | if (status < 0) | |
2224 | return status; | |
2225 | } | |
2226 | ||
2227 | if (ops->set_suspend_mode) { | |
2228 | status = device_create_file(dev, | |
2229 | &dev_attr_suspend_standby_mode); | |
2230 | if (status < 0) | |
2231 | return status; | |
2232 | status = device_create_file(dev, | |
2233 | &dev_attr_suspend_mem_mode); | |
2234 | if (status < 0) | |
2235 | return status; | |
2236 | status = device_create_file(dev, | |
2237 | &dev_attr_suspend_disk_mode); | |
2238 | if (status < 0) | |
2239 | return status; | |
2240 | } | |
2241 | ||
2242 | return status; | |
2243 | } | |
2244 | ||
414c70cb LG |
2245 | /** |
2246 | * regulator_register - register regulator | |
69279fb9 MB |
2247 | * @regulator_desc: regulator to register |
2248 | * @dev: struct device for the regulator | |
0527100f | 2249 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2250 | * @driver_data: private regulator data |
414c70cb LG |
2251 | * |
2252 | * Called by regulator drivers to register a regulator. | |
2253 | * Returns 0 on success. | |
2254 | */ | |
2255 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
2256 | struct device *dev, struct regulator_init_data *init_data, |
2257 | void *driver_data) | |
414c70cb LG |
2258 | { |
2259 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2260 | struct regulator_dev *rdev; | |
a5766f11 | 2261 | int ret, i; |
414c70cb LG |
2262 | |
2263 | if (regulator_desc == NULL) | |
2264 | return ERR_PTR(-EINVAL); | |
2265 | ||
2266 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2267 | return ERR_PTR(-EINVAL); | |
2268 | ||
cd78dfc6 DL |
2269 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2270 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2271 | return ERR_PTR(-EINVAL); |
2272 | ||
46fabe1e MB |
2273 | if (!init_data) |
2274 | return ERR_PTR(-EINVAL); | |
2275 | ||
414c70cb LG |
2276 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2277 | if (rdev == NULL) | |
2278 | return ERR_PTR(-ENOMEM); | |
2279 | ||
2280 | mutex_lock(®ulator_list_mutex); | |
2281 | ||
2282 | mutex_init(&rdev->mutex); | |
a5766f11 | 2283 | rdev->reg_data = driver_data; |
414c70cb LG |
2284 | rdev->owner = regulator_desc->owner; |
2285 | rdev->desc = regulator_desc; | |
2286 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2287 | INIT_LIST_HEAD(&rdev->supply_list); | |
2288 | INIT_LIST_HEAD(&rdev->list); | |
2289 | INIT_LIST_HEAD(&rdev->slist); | |
2290 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2291 | ||
a5766f11 LG |
2292 | /* preform any regulator specific init */ |
2293 | if (init_data->regulator_init) { | |
2294 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2295 | if (ret < 0) |
2296 | goto clean; | |
a5766f11 LG |
2297 | } |
2298 | ||
a5766f11 | 2299 | /* register with sysfs */ |
414c70cb | 2300 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2301 | rdev->dev.parent = dev; |
812460a9 KS |
2302 | dev_set_name(&rdev->dev, "regulator.%d", |
2303 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2304 | ret = device_register(&rdev->dev); |
4fca9545 DB |
2305 | if (ret != 0) |
2306 | goto clean; | |
a5766f11 LG |
2307 | |
2308 | dev_set_drvdata(&rdev->dev, rdev); | |
2309 | ||
74f544c1 MR |
2310 | /* set regulator constraints */ |
2311 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2312 | if (ret < 0) | |
2313 | goto scrub; | |
2314 | ||
7ad68e2f DB |
2315 | /* add attributes supported by this regulator */ |
2316 | ret = add_regulator_attributes(rdev); | |
2317 | if (ret < 0) | |
2318 | goto scrub; | |
2319 | ||
a5766f11 | 2320 | /* set supply regulator if it exists */ |
0178f3e2 MB |
2321 | if (init_data->supply_regulator && init_data->supply_regulator_dev) { |
2322 | dev_err(dev, | |
2323 | "Supply regulator specified by both name and dev\n"); | |
2324 | goto scrub; | |
2325 | } | |
2326 | ||
2327 | if (init_data->supply_regulator) { | |
2328 | struct regulator_dev *r; | |
2329 | int found = 0; | |
2330 | ||
2331 | list_for_each_entry(r, ®ulator_list, list) { | |
2332 | if (strcmp(rdev_get_name(r), | |
2333 | init_data->supply_regulator) == 0) { | |
2334 | found = 1; | |
2335 | break; | |
2336 | } | |
2337 | } | |
2338 | ||
2339 | if (!found) { | |
2340 | dev_err(dev, "Failed to find supply %s\n", | |
2341 | init_data->supply_regulator); | |
2342 | goto scrub; | |
2343 | } | |
2344 | ||
2345 | ret = set_supply(rdev, r); | |
2346 | if (ret < 0) | |
2347 | goto scrub; | |
2348 | } | |
2349 | ||
a5766f11 | 2350 | if (init_data->supply_regulator_dev) { |
0178f3e2 | 2351 | dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); |
a5766f11 LG |
2352 | ret = set_supply(rdev, |
2353 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2354 | if (ret < 0) |
2355 | goto scrub; | |
a5766f11 LG |
2356 | } |
2357 | ||
2358 | /* add consumers devices */ | |
2359 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2360 | ret = set_consumer_device_supply(rdev, | |
2361 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2362 | init_data->consumer_supplies[i].dev_name, |
a5766f11 | 2363 | init_data->consumer_supplies[i].supply); |
d4033b54 JN |
2364 | if (ret < 0) |
2365 | goto unset_supplies; | |
414c70cb | 2366 | } |
a5766f11 LG |
2367 | |
2368 | list_add(&rdev->list, ®ulator_list); | |
2369 | out: | |
414c70cb LG |
2370 | mutex_unlock(®ulator_list_mutex); |
2371 | return rdev; | |
4fca9545 | 2372 | |
d4033b54 JN |
2373 | unset_supplies: |
2374 | unset_regulator_supplies(rdev); | |
2375 | ||
4fca9545 DB |
2376 | scrub: |
2377 | device_unregister(&rdev->dev); | |
53032daf PW |
2378 | /* device core frees rdev */ |
2379 | rdev = ERR_PTR(ret); | |
2380 | goto out; | |
2381 | ||
4fca9545 DB |
2382 | clean: |
2383 | kfree(rdev); | |
2384 | rdev = ERR_PTR(ret); | |
2385 | goto out; | |
414c70cb LG |
2386 | } |
2387 | EXPORT_SYMBOL_GPL(regulator_register); | |
2388 | ||
2389 | /** | |
2390 | * regulator_unregister - unregister regulator | |
69279fb9 | 2391 | * @rdev: regulator to unregister |
414c70cb LG |
2392 | * |
2393 | * Called by regulator drivers to unregister a regulator. | |
2394 | */ | |
2395 | void regulator_unregister(struct regulator_dev *rdev) | |
2396 | { | |
2397 | if (rdev == NULL) | |
2398 | return; | |
2399 | ||
2400 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2401 | WARN_ON(rdev->open_count); |
0f1d747b | 2402 | unset_regulator_supplies(rdev); |
414c70cb LG |
2403 | list_del(&rdev->list); |
2404 | if (rdev->supply) | |
2405 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2406 | device_unregister(&rdev->dev); | |
2407 | mutex_unlock(®ulator_list_mutex); | |
2408 | } | |
2409 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2410 | ||
414c70cb | 2411 | /** |
cf7bbcdf | 2412 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2413 | * @state: system suspend state |
2414 | * | |
2415 | * Configure each regulator with it's suspend operating parameters for state. | |
2416 | * This will usually be called by machine suspend code prior to supending. | |
2417 | */ | |
2418 | int regulator_suspend_prepare(suspend_state_t state) | |
2419 | { | |
2420 | struct regulator_dev *rdev; | |
2421 | int ret = 0; | |
2422 | ||
2423 | /* ON is handled by regulator active state */ | |
2424 | if (state == PM_SUSPEND_ON) | |
2425 | return -EINVAL; | |
2426 | ||
2427 | mutex_lock(®ulator_list_mutex); | |
2428 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2429 | ||
2430 | mutex_lock(&rdev->mutex); | |
2431 | ret = suspend_prepare(rdev, state); | |
2432 | mutex_unlock(&rdev->mutex); | |
2433 | ||
2434 | if (ret < 0) { | |
2435 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1083c393 | 2436 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
2437 | goto out; |
2438 | } | |
2439 | } | |
2440 | out: | |
2441 | mutex_unlock(®ulator_list_mutex); | |
2442 | return ret; | |
2443 | } | |
2444 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2445 | ||
ca725561 MB |
2446 | /** |
2447 | * regulator_has_full_constraints - the system has fully specified constraints | |
2448 | * | |
2449 | * Calling this function will cause the regulator API to disable all | |
2450 | * regulators which have a zero use count and don't have an always_on | |
2451 | * constraint in a late_initcall. | |
2452 | * | |
2453 | * The intention is that this will become the default behaviour in a | |
2454 | * future kernel release so users are encouraged to use this facility | |
2455 | * now. | |
2456 | */ | |
2457 | void regulator_has_full_constraints(void) | |
2458 | { | |
2459 | has_full_constraints = 1; | |
2460 | } | |
2461 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2462 | ||
414c70cb LG |
2463 | /** |
2464 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2465 | * @rdev: regulator |
414c70cb LG |
2466 | * |
2467 | * Get rdev regulator driver private data. This call can be used in the | |
2468 | * regulator driver context. | |
2469 | */ | |
2470 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2471 | { | |
2472 | return rdev->reg_data; | |
2473 | } | |
2474 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2475 | ||
2476 | /** | |
2477 | * regulator_get_drvdata - get regulator driver data | |
2478 | * @regulator: regulator | |
2479 | * | |
2480 | * Get regulator driver private data. This call can be used in the consumer | |
2481 | * driver context when non API regulator specific functions need to be called. | |
2482 | */ | |
2483 | void *regulator_get_drvdata(struct regulator *regulator) | |
2484 | { | |
2485 | return regulator->rdev->reg_data; | |
2486 | } | |
2487 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2488 | ||
2489 | /** | |
2490 | * regulator_set_drvdata - set regulator driver data | |
2491 | * @regulator: regulator | |
2492 | * @data: data | |
2493 | */ | |
2494 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2495 | { | |
2496 | regulator->rdev->reg_data = data; | |
2497 | } | |
2498 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2499 | ||
2500 | /** | |
2501 | * regulator_get_id - get regulator ID | |
69279fb9 | 2502 | * @rdev: regulator |
414c70cb LG |
2503 | */ |
2504 | int rdev_get_id(struct regulator_dev *rdev) | |
2505 | { | |
2506 | return rdev->desc->id; | |
2507 | } | |
2508 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2509 | ||
a5766f11 LG |
2510 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2511 | { | |
2512 | return &rdev->dev; | |
2513 | } | |
2514 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2515 | ||
2516 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2517 | { | |
2518 | return reg_init_data->driver_data; | |
2519 | } | |
2520 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2521 | ||
414c70cb LG |
2522 | static int __init regulator_init(void) |
2523 | { | |
34abbd68 MB |
2524 | int ret; |
2525 | ||
414c70cb | 2526 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); |
34abbd68 MB |
2527 | |
2528 | ret = class_register(®ulator_class); | |
2529 | ||
2530 | regulator_dummy_init(); | |
2531 | ||
2532 | return ret; | |
414c70cb LG |
2533 | } |
2534 | ||
2535 | /* init early to allow our consumers to complete system booting */ | |
2536 | core_initcall(regulator_init); | |
ca725561 MB |
2537 | |
2538 | static int __init regulator_init_complete(void) | |
2539 | { | |
2540 | struct regulator_dev *rdev; | |
2541 | struct regulator_ops *ops; | |
2542 | struct regulation_constraints *c; | |
2543 | int enabled, ret; | |
2544 | const char *name; | |
2545 | ||
2546 | mutex_lock(®ulator_list_mutex); | |
2547 | ||
2548 | /* If we have a full configuration then disable any regulators | |
2549 | * which are not in use or always_on. This will become the | |
2550 | * default behaviour in the future. | |
2551 | */ | |
2552 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2553 | ops = rdev->desc->ops; | |
2554 | c = rdev->constraints; | |
2555 | ||
1083c393 | 2556 | name = rdev_get_name(rdev); |
ca725561 | 2557 | |
f25e0b4f | 2558 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2559 | continue; |
2560 | ||
2561 | mutex_lock(&rdev->mutex); | |
2562 | ||
2563 | if (rdev->use_count) | |
2564 | goto unlock; | |
2565 | ||
2566 | /* If we can't read the status assume it's on. */ | |
2567 | if (ops->is_enabled) | |
2568 | enabled = ops->is_enabled(rdev); | |
2569 | else | |
2570 | enabled = 1; | |
2571 | ||
2572 | if (!enabled) | |
2573 | goto unlock; | |
2574 | ||
2575 | if (has_full_constraints) { | |
2576 | /* We log since this may kill the system if it | |
2577 | * goes wrong. */ | |
2578 | printk(KERN_INFO "%s: disabling %s\n", | |
2579 | __func__, name); | |
2580 | ret = ops->disable(rdev); | |
2581 | if (ret != 0) { | |
2582 | printk(KERN_ERR | |
2583 | "%s: couldn't disable %s: %d\n", | |
2584 | __func__, name, ret); | |
2585 | } | |
2586 | } else { | |
2587 | /* The intention is that in future we will | |
2588 | * assume that full constraints are provided | |
2589 | * so warn even if we aren't going to do | |
2590 | * anything here. | |
2591 | */ | |
2592 | printk(KERN_WARNING | |
2593 | "%s: incomplete constraints, leaving %s on\n", | |
2594 | __func__, name); | |
2595 | } | |
2596 | ||
2597 | unlock: | |
2598 | mutex_unlock(&rdev->mutex); | |
2599 | } | |
2600 | ||
2601 | mutex_unlock(®ulator_list_mutex); | |
2602 | ||
2603 | return 0; | |
2604 | } | |
2605 | late_initcall(regulator_init_complete); |