Commit | Line | Data |
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414c70cb LG |
1 | /* |
2 | * core.c -- Voltage/Current Regulator framework. | |
3 | * | |
4 | * Copyright 2007, 2008 Wolfson Microelectronics PLC. | |
a5766f11 | 5 | * Copyright 2008 SlimLogic Ltd. |
414c70cb | 6 | * |
a5766f11 | 7 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
414c70cb LG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/suspend.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/regulator/driver.h> | |
24 | #include <linux/regulator/machine.h> | |
25 | ||
26 | #define REGULATOR_VERSION "0.5" | |
27 | ||
28 | static DEFINE_MUTEX(regulator_list_mutex); | |
29 | static LIST_HEAD(regulator_list); | |
30 | static LIST_HEAD(regulator_map_list); | |
ca725561 | 31 | static int has_full_constraints; |
414c70cb | 32 | |
8dc5390d | 33 | /* |
414c70cb LG |
34 | * struct regulator_map |
35 | * | |
36 | * Used to provide symbolic supply names to devices. | |
37 | */ | |
38 | struct regulator_map { | |
39 | struct list_head list; | |
40f9244f | 40 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 41 | const char *supply; |
a5766f11 | 42 | struct regulator_dev *regulator; |
414c70cb LG |
43 | }; |
44 | ||
414c70cb LG |
45 | /* |
46 | * struct regulator | |
47 | * | |
48 | * One for each consumer device. | |
49 | */ | |
50 | struct regulator { | |
51 | struct device *dev; | |
52 | struct list_head list; | |
53 | int uA_load; | |
54 | int min_uV; | |
55 | int max_uV; | |
414c70cb LG |
56 | char *supply_name; |
57 | struct device_attribute dev_attr; | |
58 | struct regulator_dev *rdev; | |
59 | }; | |
60 | ||
61 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
62 | static int _regulator_disable(struct regulator_dev *rdev); | |
63 | static int _regulator_get_voltage(struct regulator_dev *rdev); | |
64 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
65 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
66 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
67 | unsigned long event, void *data); | |
68 | ||
1083c393 MB |
69 | static const char *rdev_get_name(struct regulator_dev *rdev) |
70 | { | |
71 | if (rdev->constraints && rdev->constraints->name) | |
72 | return rdev->constraints->name; | |
73 | else if (rdev->desc->name) | |
74 | return rdev->desc->name; | |
75 | else | |
76 | return ""; | |
77 | } | |
78 | ||
414c70cb LG |
79 | /* gets the regulator for a given consumer device */ |
80 | static struct regulator *get_device_regulator(struct device *dev) | |
81 | { | |
82 | struct regulator *regulator = NULL; | |
83 | struct regulator_dev *rdev; | |
84 | ||
85 | mutex_lock(®ulator_list_mutex); | |
86 | list_for_each_entry(rdev, ®ulator_list, list) { | |
87 | mutex_lock(&rdev->mutex); | |
88 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
89 | if (regulator->dev == dev) { | |
90 | mutex_unlock(&rdev->mutex); | |
91 | mutex_unlock(®ulator_list_mutex); | |
92 | return regulator; | |
93 | } | |
94 | } | |
95 | mutex_unlock(&rdev->mutex); | |
96 | } | |
97 | mutex_unlock(®ulator_list_mutex); | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | /* Platform voltage constraint check */ | |
102 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
103 | int *min_uV, int *max_uV) | |
104 | { | |
105 | BUG_ON(*min_uV > *max_uV); | |
106 | ||
107 | if (!rdev->constraints) { | |
108 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 109 | rdev_get_name(rdev)); |
414c70cb LG |
110 | return -ENODEV; |
111 | } | |
112 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
113 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 114 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
115 | return -EPERM; |
116 | } | |
117 | ||
118 | if (*max_uV > rdev->constraints->max_uV) | |
119 | *max_uV = rdev->constraints->max_uV; | |
120 | if (*min_uV < rdev->constraints->min_uV) | |
121 | *min_uV = rdev->constraints->min_uV; | |
122 | ||
123 | if (*min_uV > *max_uV) | |
124 | return -EINVAL; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | /* current constraint check */ | |
130 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
131 | int *min_uA, int *max_uA) | |
132 | { | |
133 | BUG_ON(*min_uA > *max_uA); | |
134 | ||
135 | if (!rdev->constraints) { | |
136 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 137 | rdev_get_name(rdev)); |
414c70cb LG |
138 | return -ENODEV; |
139 | } | |
140 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
141 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 142 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
143 | return -EPERM; |
144 | } | |
145 | ||
146 | if (*max_uA > rdev->constraints->max_uA) | |
147 | *max_uA = rdev->constraints->max_uA; | |
148 | if (*min_uA < rdev->constraints->min_uA) | |
149 | *min_uA = rdev->constraints->min_uA; | |
150 | ||
151 | if (*min_uA > *max_uA) | |
152 | return -EINVAL; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | /* operating mode constraint check */ | |
158 | static int regulator_check_mode(struct regulator_dev *rdev, int mode) | |
159 | { | |
e573520b DB |
160 | switch (mode) { |
161 | case REGULATOR_MODE_FAST: | |
162 | case REGULATOR_MODE_NORMAL: | |
163 | case REGULATOR_MODE_IDLE: | |
164 | case REGULATOR_MODE_STANDBY: | |
165 | break; | |
166 | default: | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
414c70cb LG |
170 | if (!rdev->constraints) { |
171 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 172 | rdev_get_name(rdev)); |
414c70cb LG |
173 | return -ENODEV; |
174 | } | |
175 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
176 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 177 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
178 | return -EPERM; |
179 | } | |
180 | if (!(rdev->constraints->valid_modes_mask & mode)) { | |
181 | printk(KERN_ERR "%s: invalid mode %x for %s\n", | |
1083c393 | 182 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
183 | return -EINVAL; |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /* dynamic regulator mode switching constraint check */ | |
189 | static int regulator_check_drms(struct regulator_dev *rdev) | |
190 | { | |
191 | if (!rdev->constraints) { | |
192 | printk(KERN_ERR "%s: no constraints for %s\n", __func__, | |
1083c393 | 193 | rdev_get_name(rdev)); |
414c70cb LG |
194 | return -ENODEV; |
195 | } | |
196 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
197 | printk(KERN_ERR "%s: operation not allowed for %s\n", | |
1083c393 | 198 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
199 | return -EPERM; |
200 | } | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static ssize_t device_requested_uA_show(struct device *dev, | |
205 | struct device_attribute *attr, char *buf) | |
206 | { | |
207 | struct regulator *regulator; | |
208 | ||
209 | regulator = get_device_regulator(dev); | |
210 | if (regulator == NULL) | |
211 | return 0; | |
212 | ||
213 | return sprintf(buf, "%d\n", regulator->uA_load); | |
214 | } | |
215 | ||
216 | static ssize_t regulator_uV_show(struct device *dev, | |
217 | struct device_attribute *attr, char *buf) | |
218 | { | |
a5766f11 | 219 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
220 | ssize_t ret; |
221 | ||
222 | mutex_lock(&rdev->mutex); | |
223 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
224 | mutex_unlock(&rdev->mutex); | |
225 | ||
226 | return ret; | |
227 | } | |
7ad68e2f | 228 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
229 | |
230 | static ssize_t regulator_uA_show(struct device *dev, | |
231 | struct device_attribute *attr, char *buf) | |
232 | { | |
a5766f11 | 233 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
234 | |
235 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
236 | } | |
7ad68e2f | 237 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 238 | |
bc558a60 MB |
239 | static ssize_t regulator_name_show(struct device *dev, |
240 | struct device_attribute *attr, char *buf) | |
241 | { | |
242 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 243 | |
1083c393 | 244 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 MB |
245 | } |
246 | ||
4fca9545 | 247 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 248 | { |
414c70cb LG |
249 | switch (mode) { |
250 | case REGULATOR_MODE_FAST: | |
251 | return sprintf(buf, "fast\n"); | |
252 | case REGULATOR_MODE_NORMAL: | |
253 | return sprintf(buf, "normal\n"); | |
254 | case REGULATOR_MODE_IDLE: | |
255 | return sprintf(buf, "idle\n"); | |
256 | case REGULATOR_MODE_STANDBY: | |
257 | return sprintf(buf, "standby\n"); | |
258 | } | |
259 | return sprintf(buf, "unknown\n"); | |
260 | } | |
261 | ||
4fca9545 DB |
262 | static ssize_t regulator_opmode_show(struct device *dev, |
263 | struct device_attribute *attr, char *buf) | |
414c70cb | 264 | { |
a5766f11 | 265 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 266 | |
4fca9545 DB |
267 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
268 | } | |
7ad68e2f | 269 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
270 | |
271 | static ssize_t regulator_print_state(char *buf, int state) | |
272 | { | |
414c70cb LG |
273 | if (state > 0) |
274 | return sprintf(buf, "enabled\n"); | |
275 | else if (state == 0) | |
276 | return sprintf(buf, "disabled\n"); | |
277 | else | |
278 | return sprintf(buf, "unknown\n"); | |
279 | } | |
280 | ||
4fca9545 DB |
281 | static ssize_t regulator_state_show(struct device *dev, |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
285 | ssize_t ret; |
286 | ||
287 | mutex_lock(&rdev->mutex); | |
288 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
289 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 290 | |
9332546f | 291 | return ret; |
4fca9545 | 292 | } |
7ad68e2f | 293 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 294 | |
853116a1 DB |
295 | static ssize_t regulator_status_show(struct device *dev, |
296 | struct device_attribute *attr, char *buf) | |
297 | { | |
298 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
299 | int status; | |
300 | char *label; | |
301 | ||
302 | status = rdev->desc->ops->get_status(rdev); | |
303 | if (status < 0) | |
304 | return status; | |
305 | ||
306 | switch (status) { | |
307 | case REGULATOR_STATUS_OFF: | |
308 | label = "off"; | |
309 | break; | |
310 | case REGULATOR_STATUS_ON: | |
311 | label = "on"; | |
312 | break; | |
313 | case REGULATOR_STATUS_ERROR: | |
314 | label = "error"; | |
315 | break; | |
316 | case REGULATOR_STATUS_FAST: | |
317 | label = "fast"; | |
318 | break; | |
319 | case REGULATOR_STATUS_NORMAL: | |
320 | label = "normal"; | |
321 | break; | |
322 | case REGULATOR_STATUS_IDLE: | |
323 | label = "idle"; | |
324 | break; | |
325 | case REGULATOR_STATUS_STANDBY: | |
326 | label = "standby"; | |
327 | break; | |
328 | default: | |
329 | return -ERANGE; | |
330 | } | |
331 | ||
332 | return sprintf(buf, "%s\n", label); | |
333 | } | |
334 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
335 | ||
414c70cb LG |
336 | static ssize_t regulator_min_uA_show(struct device *dev, |
337 | struct device_attribute *attr, char *buf) | |
338 | { | |
a5766f11 | 339 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
340 | |
341 | if (!rdev->constraints) | |
342 | return sprintf(buf, "constraint not defined\n"); | |
343 | ||
344 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
345 | } | |
7ad68e2f | 346 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
347 | |
348 | static ssize_t regulator_max_uA_show(struct device *dev, | |
349 | struct device_attribute *attr, char *buf) | |
350 | { | |
a5766f11 | 351 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
352 | |
353 | if (!rdev->constraints) | |
354 | return sprintf(buf, "constraint not defined\n"); | |
355 | ||
356 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
357 | } | |
7ad68e2f | 358 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
359 | |
360 | static ssize_t regulator_min_uV_show(struct device *dev, | |
361 | struct device_attribute *attr, char *buf) | |
362 | { | |
a5766f11 | 363 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
364 | |
365 | if (!rdev->constraints) | |
366 | return sprintf(buf, "constraint not defined\n"); | |
367 | ||
368 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
369 | } | |
7ad68e2f | 370 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
371 | |
372 | static ssize_t regulator_max_uV_show(struct device *dev, | |
373 | struct device_attribute *attr, char *buf) | |
374 | { | |
a5766f11 | 375 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
376 | |
377 | if (!rdev->constraints) | |
378 | return sprintf(buf, "constraint not defined\n"); | |
379 | ||
380 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
381 | } | |
7ad68e2f | 382 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
383 | |
384 | static ssize_t regulator_total_uA_show(struct device *dev, | |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
a5766f11 | 387 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
388 | struct regulator *regulator; |
389 | int uA = 0; | |
390 | ||
391 | mutex_lock(&rdev->mutex); | |
392 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 393 | uA += regulator->uA_load; |
414c70cb LG |
394 | mutex_unlock(&rdev->mutex); |
395 | return sprintf(buf, "%d\n", uA); | |
396 | } | |
7ad68e2f | 397 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb LG |
398 | |
399 | static ssize_t regulator_num_users_show(struct device *dev, | |
400 | struct device_attribute *attr, char *buf) | |
401 | { | |
a5766f11 | 402 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
403 | return sprintf(buf, "%d\n", rdev->use_count); |
404 | } | |
405 | ||
406 | static ssize_t regulator_type_show(struct device *dev, | |
407 | struct device_attribute *attr, char *buf) | |
408 | { | |
a5766f11 | 409 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
410 | |
411 | switch (rdev->desc->type) { | |
412 | case REGULATOR_VOLTAGE: | |
413 | return sprintf(buf, "voltage\n"); | |
414 | case REGULATOR_CURRENT: | |
415 | return sprintf(buf, "current\n"); | |
416 | } | |
417 | return sprintf(buf, "unknown\n"); | |
418 | } | |
419 | ||
420 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
421 | struct device_attribute *attr, char *buf) | |
422 | { | |
a5766f11 | 423 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 424 | |
414c70cb LG |
425 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
426 | } | |
7ad68e2f DB |
427 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
428 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
429 | |
430 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
431 | struct device_attribute *attr, char *buf) | |
432 | { | |
a5766f11 | 433 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 434 | |
414c70cb LG |
435 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
436 | } | |
7ad68e2f DB |
437 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
438 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
439 | |
440 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
441 | struct device_attribute *attr, char *buf) | |
442 | { | |
a5766f11 | 443 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 444 | |
414c70cb LG |
445 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
446 | } | |
7ad68e2f DB |
447 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
448 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 449 | |
414c70cb LG |
450 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
a5766f11 | 453 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 454 | |
4fca9545 DB |
455 | return regulator_print_opmode(buf, |
456 | rdev->constraints->state_mem.mode); | |
414c70cb | 457 | } |
7ad68e2f DB |
458 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
459 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
460 | |
461 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
462 | struct device_attribute *attr, char *buf) | |
463 | { | |
a5766f11 | 464 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 465 | |
4fca9545 DB |
466 | return regulator_print_opmode(buf, |
467 | rdev->constraints->state_disk.mode); | |
414c70cb | 468 | } |
7ad68e2f DB |
469 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
470 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
471 | |
472 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
473 | struct device_attribute *attr, char *buf) | |
474 | { | |
a5766f11 | 475 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 476 | |
4fca9545 DB |
477 | return regulator_print_opmode(buf, |
478 | rdev->constraints->state_standby.mode); | |
414c70cb | 479 | } |
7ad68e2f DB |
480 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
481 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
482 | |
483 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
484 | struct device_attribute *attr, char *buf) | |
485 | { | |
a5766f11 | 486 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 487 | |
4fca9545 DB |
488 | return regulator_print_state(buf, |
489 | rdev->constraints->state_mem.enabled); | |
414c70cb | 490 | } |
7ad68e2f DB |
491 | static DEVICE_ATTR(suspend_mem_state, 0444, |
492 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
493 | |
494 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
495 | struct device_attribute *attr, char *buf) | |
496 | { | |
a5766f11 | 497 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 498 | |
4fca9545 DB |
499 | return regulator_print_state(buf, |
500 | rdev->constraints->state_disk.enabled); | |
414c70cb | 501 | } |
7ad68e2f DB |
502 | static DEVICE_ATTR(suspend_disk_state, 0444, |
503 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
504 | |
505 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
506 | struct device_attribute *attr, char *buf) | |
507 | { | |
a5766f11 | 508 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 509 | |
4fca9545 DB |
510 | return regulator_print_state(buf, |
511 | rdev->constraints->state_standby.enabled); | |
414c70cb | 512 | } |
7ad68e2f DB |
513 | static DEVICE_ATTR(suspend_standby_state, 0444, |
514 | regulator_suspend_standby_state_show, NULL); | |
515 | ||
bc558a60 | 516 | |
7ad68e2f DB |
517 | /* |
518 | * These are the only attributes are present for all regulators. | |
519 | * Other attributes are a function of regulator functionality. | |
520 | */ | |
414c70cb | 521 | static struct device_attribute regulator_dev_attrs[] = { |
bc558a60 | 522 | __ATTR(name, 0444, regulator_name_show, NULL), |
414c70cb LG |
523 | __ATTR(num_users, 0444, regulator_num_users_show, NULL), |
524 | __ATTR(type, 0444, regulator_type_show, NULL), | |
414c70cb LG |
525 | __ATTR_NULL, |
526 | }; | |
527 | ||
528 | static void regulator_dev_release(struct device *dev) | |
529 | { | |
a5766f11 | 530 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
531 | kfree(rdev); |
532 | } | |
533 | ||
534 | static struct class regulator_class = { | |
535 | .name = "regulator", | |
536 | .dev_release = regulator_dev_release, | |
537 | .dev_attrs = regulator_dev_attrs, | |
538 | }; | |
539 | ||
540 | /* Calculate the new optimum regulator operating mode based on the new total | |
541 | * consumer load. All locks held by caller */ | |
542 | static void drms_uA_update(struct regulator_dev *rdev) | |
543 | { | |
544 | struct regulator *sibling; | |
545 | int current_uA = 0, output_uV, input_uV, err; | |
546 | unsigned int mode; | |
547 | ||
548 | err = regulator_check_drms(rdev); | |
549 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
036de8ef DC |
550 | !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) |
551 | return; | |
414c70cb LG |
552 | |
553 | /* get output voltage */ | |
554 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
555 | if (output_uV <= 0) | |
556 | return; | |
557 | ||
558 | /* get input voltage */ | |
559 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
560 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
561 | else | |
562 | input_uV = rdev->constraints->input_uV; | |
563 | if (input_uV <= 0) | |
564 | return; | |
565 | ||
566 | /* calc total requested load */ | |
567 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 568 | current_uA += sibling->uA_load; |
414c70cb LG |
569 | |
570 | /* now get the optimum mode for our new total regulator load */ | |
571 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
572 | output_uV, current_uA); | |
573 | ||
574 | /* check the new mode is allowed */ | |
575 | err = regulator_check_mode(rdev, mode); | |
576 | if (err == 0) | |
577 | rdev->desc->ops->set_mode(rdev, mode); | |
578 | } | |
579 | ||
580 | static int suspend_set_state(struct regulator_dev *rdev, | |
581 | struct regulator_state *rstate) | |
582 | { | |
583 | int ret = 0; | |
638f85c5 MB |
584 | bool can_set_state; |
585 | ||
586 | can_set_state = rdev->desc->ops->set_suspend_enable && | |
587 | rdev->desc->ops->set_suspend_disable; | |
588 | ||
589 | /* If we have no suspend mode configration don't set anything; | |
590 | * only warn if the driver actually makes the suspend mode | |
591 | * configurable. | |
592 | */ | |
593 | if (!rstate->enabled && !rstate->disabled) { | |
594 | if (can_set_state) | |
595 | printk(KERN_WARNING "%s: No configuration for %s\n", | |
596 | __func__, rdev_get_name(rdev)); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | if (rstate->enabled && rstate->disabled) { | |
601 | printk(KERN_ERR "%s: invalid configuration for %s\n", | |
602 | __func__, rdev_get_name(rdev)); | |
603 | return -EINVAL; | |
604 | } | |
414c70cb | 605 | |
638f85c5 | 606 | if (!can_set_state) { |
a5766f11 LG |
607 | printk(KERN_ERR "%s: no way to set suspend state\n", |
608 | __func__); | |
414c70cb | 609 | return -EINVAL; |
a5766f11 | 610 | } |
414c70cb LG |
611 | |
612 | if (rstate->enabled) | |
613 | ret = rdev->desc->ops->set_suspend_enable(rdev); | |
614 | else | |
615 | ret = rdev->desc->ops->set_suspend_disable(rdev); | |
616 | if (ret < 0) { | |
617 | printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
622 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
623 | if (ret < 0) { | |
624 | printk(KERN_ERR "%s: failed to set voltage\n", | |
625 | __func__); | |
626 | return ret; | |
627 | } | |
628 | } | |
629 | ||
630 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
631 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
632 | if (ret < 0) { | |
633 | printk(KERN_ERR "%s: failed to set mode\n", __func__); | |
634 | return ret; | |
635 | } | |
636 | } | |
637 | return ret; | |
638 | } | |
639 | ||
640 | /* locks held by caller */ | |
641 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
642 | { | |
643 | if (!rdev->constraints) | |
644 | return -EINVAL; | |
645 | ||
646 | switch (state) { | |
647 | case PM_SUSPEND_STANDBY: | |
648 | return suspend_set_state(rdev, | |
649 | &rdev->constraints->state_standby); | |
650 | case PM_SUSPEND_MEM: | |
651 | return suspend_set_state(rdev, | |
652 | &rdev->constraints->state_mem); | |
653 | case PM_SUSPEND_MAX: | |
654 | return suspend_set_state(rdev, | |
655 | &rdev->constraints->state_disk); | |
656 | default: | |
657 | return -EINVAL; | |
658 | } | |
659 | } | |
660 | ||
661 | static void print_constraints(struct regulator_dev *rdev) | |
662 | { | |
663 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 664 | char buf[80] = ""; |
8f031b48 MB |
665 | int count = 0; |
666 | int ret; | |
414c70cb | 667 | |
8f031b48 | 668 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 669 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
670 | count += sprintf(buf + count, "%d mV ", |
671 | constraints->min_uV / 1000); | |
414c70cb | 672 | else |
8f031b48 MB |
673 | count += sprintf(buf + count, "%d <--> %d mV ", |
674 | constraints->min_uV / 1000, | |
675 | constraints->max_uV / 1000); | |
676 | } | |
677 | ||
678 | if (!constraints->min_uV || | |
679 | constraints->min_uV != constraints->max_uV) { | |
680 | ret = _regulator_get_voltage(rdev); | |
681 | if (ret > 0) | |
682 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
683 | } | |
684 | ||
685 | if (constraints->min_uA && constraints->max_uA) { | |
414c70cb | 686 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
687 | count += sprintf(buf + count, "%d mA ", |
688 | constraints->min_uA / 1000); | |
414c70cb | 689 | else |
8f031b48 MB |
690 | count += sprintf(buf + count, "%d <--> %d mA ", |
691 | constraints->min_uA / 1000, | |
692 | constraints->max_uA / 1000); | |
693 | } | |
694 | ||
695 | if (!constraints->min_uA || | |
696 | constraints->min_uA != constraints->max_uA) { | |
697 | ret = _regulator_get_current_limit(rdev); | |
698 | if (ret > 0) | |
699 | count += sprintf(buf + count, "at %d uA ", ret / 1000); | |
414c70cb | 700 | } |
8f031b48 | 701 | |
414c70cb LG |
702 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
703 | count += sprintf(buf + count, "fast "); | |
704 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
705 | count += sprintf(buf + count, "normal "); | |
706 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
707 | count += sprintf(buf + count, "idle "); | |
708 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
709 | count += sprintf(buf + count, "standby"); | |
710 | ||
1083c393 | 711 | printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); |
414c70cb LG |
712 | } |
713 | ||
e79055d6 | 714 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 715 | struct regulation_constraints *constraints) |
a5766f11 | 716 | { |
e5fda26c | 717 | struct regulator_ops *ops = rdev->desc->ops; |
1083c393 | 718 | const char *name = rdev_get_name(rdev); |
af5866c9 MB |
719 | int ret; |
720 | ||
721 | /* do we need to apply the constraint voltage */ | |
722 | if (rdev->constraints->apply_uV && | |
723 | rdev->constraints->min_uV == rdev->constraints->max_uV && | |
724 | ops->set_voltage) { | |
725 | ret = ops->set_voltage(rdev, | |
726 | rdev->constraints->min_uV, rdev->constraints->max_uV); | |
727 | if (ret < 0) { | |
728 | printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", | |
729 | __func__, | |
730 | rdev->constraints->min_uV, name); | |
731 | rdev->constraints = NULL; | |
732 | return ret; | |
733 | } | |
734 | } | |
e06f5b4f | 735 | |
4367cfdc DB |
736 | /* constrain machine-level voltage specs to fit |
737 | * the actual range supported by this regulator. | |
738 | */ | |
739 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
740 | int count = rdev->desc->n_voltages; | |
741 | int i; | |
742 | int min_uV = INT_MAX; | |
743 | int max_uV = INT_MIN; | |
744 | int cmin = constraints->min_uV; | |
745 | int cmax = constraints->max_uV; | |
746 | ||
3e590918 MB |
747 | /* it's safe to autoconfigure fixed-voltage supplies |
748 | and the constraints are used by list_voltage. */ | |
4367cfdc | 749 | if (count == 1 && !cmin) { |
3e590918 | 750 | cmin = 1; |
4367cfdc | 751 | cmax = INT_MAX; |
3e590918 MB |
752 | constraints->min_uV = cmin; |
753 | constraints->max_uV = cmax; | |
4367cfdc DB |
754 | } |
755 | ||
3e2b9abd MB |
756 | /* voltage constraints are optional */ |
757 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 758 | return 0; |
3e2b9abd | 759 | |
4367cfdc | 760 | /* else require explicit machine-level constraints */ |
3e2b9abd | 761 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
4367cfdc DB |
762 | pr_err("%s: %s '%s' voltage constraints\n", |
763 | __func__, "invalid", name); | |
e79055d6 | 764 | return -EINVAL; |
4367cfdc DB |
765 | } |
766 | ||
767 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
768 | for (i = 0; i < count; i++) { | |
769 | int value; | |
770 | ||
771 | value = ops->list_voltage(rdev, i); | |
772 | if (value <= 0) | |
773 | continue; | |
774 | ||
775 | /* maybe adjust [min_uV..max_uV] */ | |
776 | if (value >= cmin && value < min_uV) | |
777 | min_uV = value; | |
778 | if (value <= cmax && value > max_uV) | |
779 | max_uV = value; | |
780 | } | |
781 | ||
782 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
783 | if (max_uV < min_uV) { | |
784 | pr_err("%s: %s '%s' voltage constraints\n", | |
785 | __func__, "unsupportable", name); | |
e79055d6 | 786 | return -EINVAL; |
4367cfdc DB |
787 | } |
788 | ||
789 | /* use regulator's subset of machine constraints */ | |
790 | if (constraints->min_uV < min_uV) { | |
791 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
792 | __func__, name, "min_uV", | |
793 | constraints->min_uV, min_uV); | |
794 | constraints->min_uV = min_uV; | |
795 | } | |
796 | if (constraints->max_uV > max_uV) { | |
797 | pr_debug("%s: override '%s' %s, %d -> %d\n", | |
798 | __func__, name, "max_uV", | |
799 | constraints->max_uV, max_uV); | |
800 | constraints->max_uV = max_uV; | |
801 | } | |
802 | } | |
803 | ||
e79055d6 MB |
804 | return 0; |
805 | } | |
806 | ||
807 | /** | |
808 | * set_machine_constraints - sets regulator constraints | |
809 | * @rdev: regulator source | |
810 | * @constraints: constraints to apply | |
811 | * | |
812 | * Allows platform initialisation code to define and constrain | |
813 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
814 | * Constraints *must* be set by platform code in order for some | |
815 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
816 | * set_mode. | |
817 | */ | |
818 | static int set_machine_constraints(struct regulator_dev *rdev, | |
819 | struct regulation_constraints *constraints) | |
820 | { | |
821 | int ret = 0; | |
822 | const char *name; | |
823 | struct regulator_ops *ops = rdev->desc->ops; | |
824 | ||
af5866c9 MB |
825 | rdev->constraints = constraints; |
826 | ||
1083c393 MB |
827 | name = rdev_get_name(rdev); |
828 | ||
829 | ret = machine_constraints_voltage(rdev, constraints); | |
e79055d6 MB |
830 | if (ret != 0) |
831 | goto out; | |
832 | ||
a5766f11 | 833 | /* do we need to setup our suspend state */ |
e06f5b4f | 834 | if (constraints->initial_state) { |
a5766f11 | 835 | ret = suspend_prepare(rdev, constraints->initial_state); |
e06f5b4f MB |
836 | if (ret < 0) { |
837 | printk(KERN_ERR "%s: failed to set suspend state for %s\n", | |
838 | __func__, name); | |
839 | rdev->constraints = NULL; | |
840 | goto out; | |
841 | } | |
842 | } | |
a5766f11 | 843 | |
a308466c MB |
844 | if (constraints->initial_mode) { |
845 | if (!ops->set_mode) { | |
846 | printk(KERN_ERR "%s: no set_mode operation for %s\n", | |
847 | __func__, name); | |
848 | ret = -EINVAL; | |
849 | goto out; | |
850 | } | |
851 | ||
852 | ret = ops->set_mode(rdev, constraints->initial_mode); | |
853 | if (ret < 0) { | |
854 | printk(KERN_ERR | |
855 | "%s: failed to set initial mode for %s: %d\n", | |
856 | __func__, name, ret); | |
857 | goto out; | |
858 | } | |
859 | } | |
860 | ||
cacf90f2 MB |
861 | /* If the constraints say the regulator should be on at this point |
862 | * and we have control then make sure it is enabled. | |
863 | */ | |
864 | if ((constraints->always_on || constraints->boot_on) && ops->enable) { | |
e5fda26c MB |
865 | ret = ops->enable(rdev); |
866 | if (ret < 0) { | |
867 | printk(KERN_ERR "%s: failed to enable %s\n", | |
868 | __func__, name); | |
869 | rdev->constraints = NULL; | |
870 | goto out; | |
871 | } | |
872 | } | |
873 | ||
a5766f11 LG |
874 | print_constraints(rdev); |
875 | out: | |
876 | return ret; | |
877 | } | |
878 | ||
879 | /** | |
880 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
881 | * @rdev: regulator name |
882 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
883 | * |
884 | * Called by platform initialisation code to set the supply regulator for this | |
885 | * regulator. This ensures that a regulators supply will also be enabled by the | |
886 | * core if it's child is enabled. | |
887 | */ | |
888 | static int set_supply(struct regulator_dev *rdev, | |
889 | struct regulator_dev *supply_rdev) | |
890 | { | |
891 | int err; | |
892 | ||
893 | err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, | |
894 | "supply"); | |
895 | if (err) { | |
896 | printk(KERN_ERR | |
897 | "%s: could not add device link %s err %d\n", | |
898 | __func__, supply_rdev->dev.kobj.name, err); | |
899 | goto out; | |
900 | } | |
901 | rdev->supply = supply_rdev; | |
902 | list_add(&rdev->slist, &supply_rdev->supply_list); | |
903 | out: | |
904 | return err; | |
905 | } | |
906 | ||
907 | /** | |
908 | * set_consumer_device_supply: Bind a regulator to a symbolic supply | |
69279fb9 MB |
909 | * @rdev: regulator source |
910 | * @consumer_dev: device the supply applies to | |
40f9244f | 911 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 912 | * @supply: symbolic name for supply |
a5766f11 LG |
913 | * |
914 | * Allows platform initialisation code to map physical regulator | |
915 | * sources to symbolic names for supplies for use by devices. Devices | |
916 | * should use these symbolic names to request regulators, avoiding the | |
917 | * need to provide board-specific regulator names as platform data. | |
40f9244f MB |
918 | * |
919 | * Only one of consumer_dev and consumer_dev_name may be specified. | |
a5766f11 LG |
920 | */ |
921 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f MB |
922 | struct device *consumer_dev, const char *consumer_dev_name, |
923 | const char *supply) | |
a5766f11 LG |
924 | { |
925 | struct regulator_map *node; | |
9ed2099e | 926 | int has_dev; |
a5766f11 | 927 | |
40f9244f MB |
928 | if (consumer_dev && consumer_dev_name) |
929 | return -EINVAL; | |
930 | ||
931 | if (!consumer_dev_name && consumer_dev) | |
932 | consumer_dev_name = dev_name(consumer_dev); | |
933 | ||
a5766f11 LG |
934 | if (supply == NULL) |
935 | return -EINVAL; | |
936 | ||
9ed2099e MB |
937 | if (consumer_dev_name != NULL) |
938 | has_dev = 1; | |
939 | else | |
940 | has_dev = 0; | |
941 | ||
6001e13c | 942 | list_for_each_entry(node, ®ulator_map_list, list) { |
40f9244f | 943 | if (consumer_dev_name != node->dev_name) |
6001e13c DB |
944 | continue; |
945 | if (strcmp(node->supply, supply) != 0) | |
946 | continue; | |
947 | ||
948 | dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", | |
949 | dev_name(&node->regulator->dev), | |
950 | node->regulator->desc->name, | |
951 | supply, | |
1083c393 | 952 | dev_name(&rdev->dev), rdev_get_name(rdev)); |
6001e13c DB |
953 | return -EBUSY; |
954 | } | |
955 | ||
9ed2099e | 956 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
957 | if (node == NULL) |
958 | return -ENOMEM; | |
959 | ||
960 | node->regulator = rdev; | |
a5766f11 LG |
961 | node->supply = supply; |
962 | ||
9ed2099e MB |
963 | if (has_dev) { |
964 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
965 | if (node->dev_name == NULL) { | |
966 | kfree(node); | |
967 | return -ENOMEM; | |
968 | } | |
40f9244f MB |
969 | } |
970 | ||
a5766f11 LG |
971 | list_add(&node->list, ®ulator_map_list); |
972 | return 0; | |
973 | } | |
974 | ||
975 | static void unset_consumer_device_supply(struct regulator_dev *rdev, | |
40f9244f | 976 | const char *consumer_dev_name, struct device *consumer_dev) |
a5766f11 LG |
977 | { |
978 | struct regulator_map *node, *n; | |
979 | ||
40f9244f MB |
980 | if (consumer_dev && !consumer_dev_name) |
981 | consumer_dev_name = dev_name(consumer_dev); | |
982 | ||
a5766f11 | 983 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { |
40f9244f MB |
984 | if (rdev != node->regulator) |
985 | continue; | |
986 | ||
987 | if (consumer_dev_name && node->dev_name && | |
988 | strcmp(consumer_dev_name, node->dev_name)) | |
989 | continue; | |
990 | ||
991 | list_del(&node->list); | |
992 | kfree(node->dev_name); | |
993 | kfree(node); | |
994 | return; | |
a5766f11 LG |
995 | } |
996 | } | |
997 | ||
0f1d747b MR |
998 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
999 | { | |
1000 | struct regulator_map *node, *n; | |
1001 | ||
1002 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1003 | if (rdev == node->regulator) { | |
1004 | list_del(&node->list); | |
40f9244f | 1005 | kfree(node->dev_name); |
0f1d747b MR |
1006 | kfree(node); |
1007 | return; | |
1008 | } | |
1009 | } | |
1010 | } | |
1011 | ||
414c70cb LG |
1012 | #define REG_STR_SIZE 32 |
1013 | ||
1014 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1015 | struct device *dev, | |
1016 | const char *supply_name) | |
1017 | { | |
1018 | struct regulator *regulator; | |
1019 | char buf[REG_STR_SIZE]; | |
1020 | int err, size; | |
1021 | ||
1022 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1023 | if (regulator == NULL) | |
1024 | return NULL; | |
1025 | ||
1026 | mutex_lock(&rdev->mutex); | |
1027 | regulator->rdev = rdev; | |
1028 | list_add(®ulator->list, &rdev->consumer_list); | |
1029 | ||
1030 | if (dev) { | |
1031 | /* create a 'requested_microamps_name' sysfs entry */ | |
1032 | size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", | |
1033 | supply_name); | |
1034 | if (size >= REG_STR_SIZE) | |
1035 | goto overflow_err; | |
1036 | ||
1037 | regulator->dev = dev; | |
1038 | regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); | |
1039 | if (regulator->dev_attr.attr.name == NULL) | |
1040 | goto attr_name_err; | |
1041 | ||
1042 | regulator->dev_attr.attr.owner = THIS_MODULE; | |
1043 | regulator->dev_attr.attr.mode = 0444; | |
1044 | regulator->dev_attr.show = device_requested_uA_show; | |
1045 | err = device_create_file(dev, ®ulator->dev_attr); | |
1046 | if (err < 0) { | |
1047 | printk(KERN_WARNING "%s: could not add regulator_dev" | |
1048 | " load sysfs\n", __func__); | |
1049 | goto attr_name_err; | |
1050 | } | |
1051 | ||
1052 | /* also add a link to the device sysfs entry */ | |
1053 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", | |
1054 | dev->kobj.name, supply_name); | |
1055 | if (size >= REG_STR_SIZE) | |
1056 | goto attr_err; | |
1057 | ||
1058 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1059 | if (regulator->supply_name == NULL) | |
1060 | goto attr_err; | |
1061 | ||
1062 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1063 | buf); | |
1064 | if (err) { | |
1065 | printk(KERN_WARNING | |
1066 | "%s: could not add device link %s err %d\n", | |
1067 | __func__, dev->kobj.name, err); | |
1068 | device_remove_file(dev, ®ulator->dev_attr); | |
1069 | goto link_name_err; | |
1070 | } | |
1071 | } | |
1072 | mutex_unlock(&rdev->mutex); | |
1073 | return regulator; | |
1074 | link_name_err: | |
1075 | kfree(regulator->supply_name); | |
1076 | attr_err: | |
1077 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1078 | attr_name_err: | |
1079 | kfree(regulator->dev_attr.attr.name); | |
1080 | overflow_err: | |
1081 | list_del(®ulator->list); | |
1082 | kfree(regulator); | |
1083 | mutex_unlock(&rdev->mutex); | |
1084 | return NULL; | |
1085 | } | |
1086 | ||
5ffbd136 MB |
1087 | /* Internal regulator request function */ |
1088 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
1089 | int exclusive) | |
414c70cb LG |
1090 | { |
1091 | struct regulator_dev *rdev; | |
1092 | struct regulator_map *map; | |
1093 | struct regulator *regulator = ERR_PTR(-ENODEV); | |
40f9244f | 1094 | const char *devname = NULL; |
5ffbd136 | 1095 | int ret; |
414c70cb LG |
1096 | |
1097 | if (id == NULL) { | |
1098 | printk(KERN_ERR "regulator: get() with no identifier\n"); | |
1099 | return regulator; | |
1100 | } | |
1101 | ||
40f9244f MB |
1102 | if (dev) |
1103 | devname = dev_name(dev); | |
1104 | ||
414c70cb LG |
1105 | mutex_lock(®ulator_list_mutex); |
1106 | ||
1107 | list_for_each_entry(map, ®ulator_map_list, list) { | |
40f9244f MB |
1108 | /* If the mapping has a device set up it must match */ |
1109 | if (map->dev_name && | |
1110 | (!devname || strcmp(map->dev_name, devname))) | |
1111 | continue; | |
1112 | ||
1113 | if (strcmp(map->supply, id) == 0) { | |
a5766f11 | 1114 | rdev = map->regulator; |
414c70cb | 1115 | goto found; |
a5766f11 | 1116 | } |
414c70cb | 1117 | } |
414c70cb LG |
1118 | mutex_unlock(®ulator_list_mutex); |
1119 | return regulator; | |
1120 | ||
1121 | found: | |
5ffbd136 MB |
1122 | if (rdev->exclusive) { |
1123 | regulator = ERR_PTR(-EPERM); | |
1124 | goto out; | |
1125 | } | |
1126 | ||
1127 | if (exclusive && rdev->open_count) { | |
1128 | regulator = ERR_PTR(-EBUSY); | |
1129 | goto out; | |
1130 | } | |
1131 | ||
a5766f11 LG |
1132 | if (!try_module_get(rdev->owner)) |
1133 | goto out; | |
1134 | ||
414c70cb LG |
1135 | regulator = create_regulator(rdev, dev, id); |
1136 | if (regulator == NULL) { | |
1137 | regulator = ERR_PTR(-ENOMEM); | |
1138 | module_put(rdev->owner); | |
1139 | } | |
1140 | ||
5ffbd136 MB |
1141 | rdev->open_count++; |
1142 | if (exclusive) { | |
1143 | rdev->exclusive = 1; | |
1144 | ||
1145 | ret = _regulator_is_enabled(rdev); | |
1146 | if (ret > 0) | |
1147 | rdev->use_count = 1; | |
1148 | else | |
1149 | rdev->use_count = 0; | |
1150 | } | |
1151 | ||
a5766f11 | 1152 | out: |
414c70cb | 1153 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1154 | |
414c70cb LG |
1155 | return regulator; |
1156 | } | |
5ffbd136 MB |
1157 | |
1158 | /** | |
1159 | * regulator_get - lookup and obtain a reference to a regulator. | |
1160 | * @dev: device for regulator "consumer" | |
1161 | * @id: Supply name or regulator ID. | |
1162 | * | |
1163 | * Returns a struct regulator corresponding to the regulator producer, | |
1164 | * or IS_ERR() condition containing errno. | |
1165 | * | |
1166 | * Use of supply names configured via regulator_set_device_supply() is | |
1167 | * strongly encouraged. It is recommended that the supply name used | |
1168 | * should match the name used for the supply and/or the relevant | |
1169 | * device pins in the datasheet. | |
1170 | */ | |
1171 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1172 | { | |
1173 | return _regulator_get(dev, id, 0); | |
1174 | } | |
414c70cb LG |
1175 | EXPORT_SYMBOL_GPL(regulator_get); |
1176 | ||
5ffbd136 MB |
1177 | /** |
1178 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1179 | * @dev: device for regulator "consumer" | |
1180 | * @id: Supply name or regulator ID. | |
1181 | * | |
1182 | * Returns a struct regulator corresponding to the regulator producer, | |
1183 | * or IS_ERR() condition containing errno. Other consumers will be | |
1184 | * unable to obtain this reference is held and the use count for the | |
1185 | * regulator will be initialised to reflect the current state of the | |
1186 | * regulator. | |
1187 | * | |
1188 | * This is intended for use by consumers which cannot tolerate shared | |
1189 | * use of the regulator such as those which need to force the | |
1190 | * regulator off for correct operation of the hardware they are | |
1191 | * controlling. | |
1192 | * | |
1193 | * Use of supply names configured via regulator_set_device_supply() is | |
1194 | * strongly encouraged. It is recommended that the supply name used | |
1195 | * should match the name used for the supply and/or the relevant | |
1196 | * device pins in the datasheet. | |
1197 | */ | |
1198 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1199 | { | |
1200 | return _regulator_get(dev, id, 1); | |
1201 | } | |
1202 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1203 | ||
414c70cb LG |
1204 | /** |
1205 | * regulator_put - "free" the regulator source | |
1206 | * @regulator: regulator source | |
1207 | * | |
1208 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1209 | * regulator source are balanced by regulator_disable calls prior to calling | |
1210 | * this function. | |
1211 | */ | |
1212 | void regulator_put(struct regulator *regulator) | |
1213 | { | |
1214 | struct regulator_dev *rdev; | |
1215 | ||
1216 | if (regulator == NULL || IS_ERR(regulator)) | |
1217 | return; | |
1218 | ||
414c70cb LG |
1219 | mutex_lock(®ulator_list_mutex); |
1220 | rdev = regulator->rdev; | |
1221 | ||
1222 | /* remove any sysfs entries */ | |
1223 | if (regulator->dev) { | |
1224 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); | |
1225 | kfree(regulator->supply_name); | |
1226 | device_remove_file(regulator->dev, ®ulator->dev_attr); | |
1227 | kfree(regulator->dev_attr.attr.name); | |
1228 | } | |
1229 | list_del(®ulator->list); | |
1230 | kfree(regulator); | |
1231 | ||
5ffbd136 MB |
1232 | rdev->open_count--; |
1233 | rdev->exclusive = 0; | |
1234 | ||
414c70cb LG |
1235 | module_put(rdev->owner); |
1236 | mutex_unlock(®ulator_list_mutex); | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(regulator_put); | |
1239 | ||
9a2372fa MB |
1240 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
1241 | { | |
1242 | if (!rdev->constraints) | |
1243 | return 0; | |
1244 | ||
1245 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
1246 | return 1; | |
1247 | else | |
1248 | return 0; | |
1249 | } | |
1250 | ||
414c70cb LG |
1251 | /* locks held by regulator_enable() */ |
1252 | static int _regulator_enable(struct regulator_dev *rdev) | |
1253 | { | |
9a2372fa | 1254 | int ret; |
414c70cb LG |
1255 | |
1256 | /* do we need to enable the supply regulator first */ | |
1257 | if (rdev->supply) { | |
1258 | ret = _regulator_enable(rdev->supply); | |
1259 | if (ret < 0) { | |
1260 | printk(KERN_ERR "%s: failed to enable %s: %d\n", | |
1083c393 | 1261 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1262 | return ret; |
1263 | } | |
1264 | } | |
1265 | ||
1266 | /* check voltage and requested load before enabling */ | |
9a2372fa MB |
1267 | if (rdev->constraints && |
1268 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1269 | drms_uA_update(rdev); | |
414c70cb | 1270 | |
9a2372fa MB |
1271 | if (rdev->use_count == 0) { |
1272 | /* The regulator may on if it's not switchable or left on */ | |
1273 | ret = _regulator_is_enabled(rdev); | |
1274 | if (ret == -EINVAL || ret == 0) { | |
1275 | if (!_regulator_can_change_status(rdev)) | |
1276 | return -EPERM; | |
1277 | ||
1278 | if (rdev->desc->ops->enable) { | |
1279 | ret = rdev->desc->ops->enable(rdev); | |
1280 | if (ret < 0) | |
1281 | return ret; | |
1282 | } else { | |
1283 | return -EINVAL; | |
1284 | } | |
a7433cff | 1285 | } else if (ret < 0) { |
9a2372fa | 1286 | printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", |
1083c393 | 1287 | __func__, rdev_get_name(rdev), ret); |
414c70cb LG |
1288 | return ret; |
1289 | } | |
a7433cff | 1290 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1291 | } |
1292 | ||
9a2372fa MB |
1293 | rdev->use_count++; |
1294 | ||
1295 | return 0; | |
414c70cb LG |
1296 | } |
1297 | ||
1298 | /** | |
1299 | * regulator_enable - enable regulator output | |
1300 | * @regulator: regulator source | |
1301 | * | |
cf7bbcdf MB |
1302 | * Request that the regulator be enabled with the regulator output at |
1303 | * the predefined voltage or current value. Calls to regulator_enable() | |
1304 | * must be balanced with calls to regulator_disable(). | |
1305 | * | |
414c70cb | 1306 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1307 | * hardwired in the regulator. |
414c70cb LG |
1308 | */ |
1309 | int regulator_enable(struct regulator *regulator) | |
1310 | { | |
412aec61 DB |
1311 | struct regulator_dev *rdev = regulator->rdev; |
1312 | int ret = 0; | |
414c70cb | 1313 | |
412aec61 | 1314 | mutex_lock(&rdev->mutex); |
cd94b505 | 1315 | ret = _regulator_enable(rdev); |
412aec61 | 1316 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1317 | return ret; |
1318 | } | |
1319 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1320 | ||
1321 | /* locks held by regulator_disable() */ | |
1322 | static int _regulator_disable(struct regulator_dev *rdev) | |
1323 | { | |
1324 | int ret = 0; | |
1325 | ||
cd94b505 DB |
1326 | if (WARN(rdev->use_count <= 0, |
1327 | "unbalanced disables for %s\n", | |
1083c393 | 1328 | rdev_get_name(rdev))) |
cd94b505 DB |
1329 | return -EIO; |
1330 | ||
414c70cb | 1331 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1332 | if (rdev->use_count == 1 && |
1333 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1334 | |
1335 | /* we are last user */ | |
9a2372fa MB |
1336 | if (_regulator_can_change_status(rdev) && |
1337 | rdev->desc->ops->disable) { | |
414c70cb LG |
1338 | ret = rdev->desc->ops->disable(rdev); |
1339 | if (ret < 0) { | |
1340 | printk(KERN_ERR "%s: failed to disable %s\n", | |
1083c393 | 1341 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1342 | return ret; |
1343 | } | |
1344 | } | |
1345 | ||
1346 | /* decrease our supplies ref count and disable if required */ | |
1347 | if (rdev->supply) | |
1348 | _regulator_disable(rdev->supply); | |
1349 | ||
1350 | rdev->use_count = 0; | |
1351 | } else if (rdev->use_count > 1) { | |
1352 | ||
1353 | if (rdev->constraints && | |
1354 | (rdev->constraints->valid_ops_mask & | |
1355 | REGULATOR_CHANGE_DRMS)) | |
1356 | drms_uA_update(rdev); | |
1357 | ||
1358 | rdev->use_count--; | |
1359 | } | |
1360 | return ret; | |
1361 | } | |
1362 | ||
1363 | /** | |
1364 | * regulator_disable - disable regulator output | |
1365 | * @regulator: regulator source | |
1366 | * | |
cf7bbcdf MB |
1367 | * Disable the regulator output voltage or current. Calls to |
1368 | * regulator_enable() must be balanced with calls to | |
1369 | * regulator_disable(). | |
69279fb9 | 1370 | * |
414c70cb | 1371 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1372 | * devices have it enabled, the regulator device supports disabling and |
1373 | * machine constraints permit this operation. | |
414c70cb LG |
1374 | */ |
1375 | int regulator_disable(struct regulator *regulator) | |
1376 | { | |
412aec61 DB |
1377 | struct regulator_dev *rdev = regulator->rdev; |
1378 | int ret = 0; | |
414c70cb | 1379 | |
412aec61 | 1380 | mutex_lock(&rdev->mutex); |
cd94b505 | 1381 | ret = _regulator_disable(rdev); |
412aec61 | 1382 | mutex_unlock(&rdev->mutex); |
414c70cb LG |
1383 | return ret; |
1384 | } | |
1385 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1386 | ||
1387 | /* locks held by regulator_force_disable() */ | |
1388 | static int _regulator_force_disable(struct regulator_dev *rdev) | |
1389 | { | |
1390 | int ret = 0; | |
1391 | ||
1392 | /* force disable */ | |
1393 | if (rdev->desc->ops->disable) { | |
1394 | /* ah well, who wants to live forever... */ | |
1395 | ret = rdev->desc->ops->disable(rdev); | |
1396 | if (ret < 0) { | |
1397 | printk(KERN_ERR "%s: failed to force disable %s\n", | |
1083c393 | 1398 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1399 | return ret; |
1400 | } | |
1401 | /* notify other consumers that power has been forced off */ | |
1402 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, | |
1403 | NULL); | |
1404 | } | |
1405 | ||
1406 | /* decrease our supplies ref count and disable if required */ | |
1407 | if (rdev->supply) | |
1408 | _regulator_disable(rdev->supply); | |
1409 | ||
1410 | rdev->use_count = 0; | |
1411 | return ret; | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * regulator_force_disable - force disable regulator output | |
1416 | * @regulator: regulator source | |
1417 | * | |
1418 | * Forcibly disable the regulator output voltage or current. | |
1419 | * NOTE: this *will* disable the regulator output even if other consumer | |
1420 | * devices have it enabled. This should be used for situations when device | |
1421 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1422 | */ | |
1423 | int regulator_force_disable(struct regulator *regulator) | |
1424 | { | |
1425 | int ret; | |
1426 | ||
1427 | mutex_lock(®ulator->rdev->mutex); | |
414c70cb LG |
1428 | regulator->uA_load = 0; |
1429 | ret = _regulator_force_disable(regulator->rdev); | |
1430 | mutex_unlock(®ulator->rdev->mutex); | |
1431 | return ret; | |
1432 | } | |
1433 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1434 | ||
1435 | static int _regulator_is_enabled(struct regulator_dev *rdev) | |
1436 | { | |
414c70cb | 1437 | /* sanity check */ |
9332546f MB |
1438 | if (!rdev->desc->ops->is_enabled) |
1439 | return -EINVAL; | |
414c70cb | 1440 | |
9332546f | 1441 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
1442 | } |
1443 | ||
1444 | /** | |
1445 | * regulator_is_enabled - is the regulator output enabled | |
1446 | * @regulator: regulator source | |
1447 | * | |
412aec61 DB |
1448 | * Returns positive if the regulator driver backing the source/client |
1449 | * has requested that the device be enabled, zero if it hasn't, else a | |
1450 | * negative errno code. | |
1451 | * | |
1452 | * Note that the device backing this regulator handle can have multiple | |
1453 | * users, so it might be enabled even if regulator_enable() was never | |
1454 | * called for this particular source. | |
414c70cb LG |
1455 | */ |
1456 | int regulator_is_enabled(struct regulator *regulator) | |
1457 | { | |
9332546f MB |
1458 | int ret; |
1459 | ||
1460 | mutex_lock(®ulator->rdev->mutex); | |
1461 | ret = _regulator_is_enabled(regulator->rdev); | |
1462 | mutex_unlock(®ulator->rdev->mutex); | |
1463 | ||
1464 | return ret; | |
414c70cb LG |
1465 | } |
1466 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
1467 | ||
4367cfdc DB |
1468 | /** |
1469 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
1470 | * @regulator: regulator source | |
1471 | * | |
1472 | * Returns number of selectors, or negative errno. Selectors are | |
1473 | * numbered starting at zero, and typically correspond to bitfields | |
1474 | * in hardware registers. | |
1475 | */ | |
1476 | int regulator_count_voltages(struct regulator *regulator) | |
1477 | { | |
1478 | struct regulator_dev *rdev = regulator->rdev; | |
1479 | ||
1480 | return rdev->desc->n_voltages ? : -EINVAL; | |
1481 | } | |
1482 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
1483 | ||
1484 | /** | |
1485 | * regulator_list_voltage - enumerate supported voltages | |
1486 | * @regulator: regulator source | |
1487 | * @selector: identify voltage to list | |
1488 | * Context: can sleep | |
1489 | * | |
1490 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
1491 | * zero if this selector code can't be used on this sytem, or a | |
1492 | * negative errno. | |
1493 | */ | |
1494 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
1495 | { | |
1496 | struct regulator_dev *rdev = regulator->rdev; | |
1497 | struct regulator_ops *ops = rdev->desc->ops; | |
1498 | int ret; | |
1499 | ||
1500 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
1501 | return -EINVAL; | |
1502 | ||
1503 | mutex_lock(&rdev->mutex); | |
1504 | ret = ops->list_voltage(rdev, selector); | |
1505 | mutex_unlock(&rdev->mutex); | |
1506 | ||
1507 | if (ret > 0) { | |
1508 | if (ret < rdev->constraints->min_uV) | |
1509 | ret = 0; | |
1510 | else if (ret > rdev->constraints->max_uV) | |
1511 | ret = 0; | |
1512 | } | |
1513 | ||
1514 | return ret; | |
1515 | } | |
1516 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
1517 | ||
a7a1ad90 MB |
1518 | /** |
1519 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
1520 | * | |
1521 | * @regulator: Regulator to check. | |
1522 | * @min_uV: Minimum required voltage in uV. | |
1523 | * @max_uV: Maximum required voltage in uV. | |
1524 | * | |
1525 | * Returns a boolean or a negative error code. | |
1526 | */ | |
1527 | int regulator_is_supported_voltage(struct regulator *regulator, | |
1528 | int min_uV, int max_uV) | |
1529 | { | |
1530 | int i, voltages, ret; | |
1531 | ||
1532 | ret = regulator_count_voltages(regulator); | |
1533 | if (ret < 0) | |
1534 | return ret; | |
1535 | voltages = ret; | |
1536 | ||
1537 | for (i = 0; i < voltages; i++) { | |
1538 | ret = regulator_list_voltage(regulator, i); | |
1539 | ||
1540 | if (ret >= min_uV && ret <= max_uV) | |
1541 | return 1; | |
1542 | } | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | ||
414c70cb LG |
1547 | /** |
1548 | * regulator_set_voltage - set regulator output voltage | |
1549 | * @regulator: regulator source | |
1550 | * @min_uV: Minimum required voltage in uV | |
1551 | * @max_uV: Maximum acceptable voltage in uV | |
1552 | * | |
1553 | * Sets a voltage regulator to the desired output voltage. This can be set | |
1554 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
1555 | * | |
1556 | * If the regulator is enabled then the voltage will change to the new value | |
1557 | * immediately otherwise if the regulator is disabled the regulator will | |
1558 | * output at the new voltage when enabled. | |
1559 | * | |
1560 | * NOTE: If the regulator is shared between several devices then the lowest | |
1561 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 1562 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
1563 | * calling this function otherwise this call will fail. |
1564 | */ | |
1565 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
1566 | { | |
1567 | struct regulator_dev *rdev = regulator->rdev; | |
1568 | int ret; | |
1569 | ||
1570 | mutex_lock(&rdev->mutex); | |
1571 | ||
1572 | /* sanity check */ | |
1573 | if (!rdev->desc->ops->set_voltage) { | |
1574 | ret = -EINVAL; | |
1575 | goto out; | |
1576 | } | |
1577 | ||
1578 | /* constraints check */ | |
1579 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
1580 | if (ret < 0) | |
1581 | goto out; | |
1582 | regulator->min_uV = min_uV; | |
1583 | regulator->max_uV = max_uV; | |
1584 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); | |
1585 | ||
1586 | out: | |
b136fb44 | 1587 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); |
414c70cb LG |
1588 | mutex_unlock(&rdev->mutex); |
1589 | return ret; | |
1590 | } | |
1591 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
1592 | ||
1593 | static int _regulator_get_voltage(struct regulator_dev *rdev) | |
1594 | { | |
1595 | /* sanity check */ | |
1596 | if (rdev->desc->ops->get_voltage) | |
1597 | return rdev->desc->ops->get_voltage(rdev); | |
1598 | else | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | ||
1602 | /** | |
1603 | * regulator_get_voltage - get regulator output voltage | |
1604 | * @regulator: regulator source | |
1605 | * | |
1606 | * This returns the current regulator voltage in uV. | |
1607 | * | |
1608 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
1609 | * function should not be used to determine regulator state. | |
1610 | */ | |
1611 | int regulator_get_voltage(struct regulator *regulator) | |
1612 | { | |
1613 | int ret; | |
1614 | ||
1615 | mutex_lock(®ulator->rdev->mutex); | |
1616 | ||
1617 | ret = _regulator_get_voltage(regulator->rdev); | |
1618 | ||
1619 | mutex_unlock(®ulator->rdev->mutex); | |
1620 | ||
1621 | return ret; | |
1622 | } | |
1623 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
1624 | ||
1625 | /** | |
1626 | * regulator_set_current_limit - set regulator output current limit | |
1627 | * @regulator: regulator source | |
1628 | * @min_uA: Minimuum supported current in uA | |
1629 | * @max_uA: Maximum supported current in uA | |
1630 | * | |
1631 | * Sets current sink to the desired output current. This can be set during | |
1632 | * any regulator state. IOW, regulator can be disabled or enabled. | |
1633 | * | |
1634 | * If the regulator is enabled then the current will change to the new value | |
1635 | * immediately otherwise if the regulator is disabled the regulator will | |
1636 | * output at the new current when enabled. | |
1637 | * | |
1638 | * NOTE: Regulator system constraints must be set for this regulator before | |
1639 | * calling this function otherwise this call will fail. | |
1640 | */ | |
1641 | int regulator_set_current_limit(struct regulator *regulator, | |
1642 | int min_uA, int max_uA) | |
1643 | { | |
1644 | struct regulator_dev *rdev = regulator->rdev; | |
1645 | int ret; | |
1646 | ||
1647 | mutex_lock(&rdev->mutex); | |
1648 | ||
1649 | /* sanity check */ | |
1650 | if (!rdev->desc->ops->set_current_limit) { | |
1651 | ret = -EINVAL; | |
1652 | goto out; | |
1653 | } | |
1654 | ||
1655 | /* constraints check */ | |
1656 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
1657 | if (ret < 0) | |
1658 | goto out; | |
1659 | ||
1660 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
1661 | out: | |
1662 | mutex_unlock(&rdev->mutex); | |
1663 | return ret; | |
1664 | } | |
1665 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
1666 | ||
1667 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
1668 | { | |
1669 | int ret; | |
1670 | ||
1671 | mutex_lock(&rdev->mutex); | |
1672 | ||
1673 | /* sanity check */ | |
1674 | if (!rdev->desc->ops->get_current_limit) { | |
1675 | ret = -EINVAL; | |
1676 | goto out; | |
1677 | } | |
1678 | ||
1679 | ret = rdev->desc->ops->get_current_limit(rdev); | |
1680 | out: | |
1681 | mutex_unlock(&rdev->mutex); | |
1682 | return ret; | |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * regulator_get_current_limit - get regulator output current | |
1687 | * @regulator: regulator source | |
1688 | * | |
1689 | * This returns the current supplied by the specified current sink in uA. | |
1690 | * | |
1691 | * NOTE: If the regulator is disabled it will return the current value. This | |
1692 | * function should not be used to determine regulator state. | |
1693 | */ | |
1694 | int regulator_get_current_limit(struct regulator *regulator) | |
1695 | { | |
1696 | return _regulator_get_current_limit(regulator->rdev); | |
1697 | } | |
1698 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
1699 | ||
1700 | /** | |
1701 | * regulator_set_mode - set regulator operating mode | |
1702 | * @regulator: regulator source | |
1703 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
1704 | * | |
1705 | * Set regulator operating mode to increase regulator efficiency or improve | |
1706 | * regulation performance. | |
1707 | * | |
1708 | * NOTE: Regulator system constraints must be set for this regulator before | |
1709 | * calling this function otherwise this call will fail. | |
1710 | */ | |
1711 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
1712 | { | |
1713 | struct regulator_dev *rdev = regulator->rdev; | |
1714 | int ret; | |
1715 | ||
1716 | mutex_lock(&rdev->mutex); | |
1717 | ||
1718 | /* sanity check */ | |
1719 | if (!rdev->desc->ops->set_mode) { | |
1720 | ret = -EINVAL; | |
1721 | goto out; | |
1722 | } | |
1723 | ||
1724 | /* constraints check */ | |
1725 | ret = regulator_check_mode(rdev, mode); | |
1726 | if (ret < 0) | |
1727 | goto out; | |
1728 | ||
1729 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
1730 | out: | |
1731 | mutex_unlock(&rdev->mutex); | |
1732 | return ret; | |
1733 | } | |
1734 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
1735 | ||
1736 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
1737 | { | |
1738 | int ret; | |
1739 | ||
1740 | mutex_lock(&rdev->mutex); | |
1741 | ||
1742 | /* sanity check */ | |
1743 | if (!rdev->desc->ops->get_mode) { | |
1744 | ret = -EINVAL; | |
1745 | goto out; | |
1746 | } | |
1747 | ||
1748 | ret = rdev->desc->ops->get_mode(rdev); | |
1749 | out: | |
1750 | mutex_unlock(&rdev->mutex); | |
1751 | return ret; | |
1752 | } | |
1753 | ||
1754 | /** | |
1755 | * regulator_get_mode - get regulator operating mode | |
1756 | * @regulator: regulator source | |
1757 | * | |
1758 | * Get the current regulator operating mode. | |
1759 | */ | |
1760 | unsigned int regulator_get_mode(struct regulator *regulator) | |
1761 | { | |
1762 | return _regulator_get_mode(regulator->rdev); | |
1763 | } | |
1764 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
1765 | ||
1766 | /** | |
1767 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
1768 | * @regulator: regulator source | |
1769 | * @uA_load: load current | |
1770 | * | |
1771 | * Notifies the regulator core of a new device load. This is then used by | |
1772 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
1773 | * operating mode for the new regulator loading. | |
1774 | * | |
1775 | * Consumer devices notify their supply regulator of the maximum power | |
1776 | * they will require (can be taken from device datasheet in the power | |
1777 | * consumption tables) when they change operational status and hence power | |
1778 | * state. Examples of operational state changes that can affect power | |
1779 | * consumption are :- | |
1780 | * | |
1781 | * o Device is opened / closed. | |
1782 | * o Device I/O is about to begin or has just finished. | |
1783 | * o Device is idling in between work. | |
1784 | * | |
1785 | * This information is also exported via sysfs to userspace. | |
1786 | * | |
1787 | * DRMS will sum the total requested load on the regulator and change | |
1788 | * to the most efficient operating mode if platform constraints allow. | |
1789 | * | |
1790 | * Returns the new regulator mode or error. | |
1791 | */ | |
1792 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
1793 | { | |
1794 | struct regulator_dev *rdev = regulator->rdev; | |
1795 | struct regulator *consumer; | |
1796 | int ret, output_uV, input_uV, total_uA_load = 0; | |
1797 | unsigned int mode; | |
1798 | ||
1799 | mutex_lock(&rdev->mutex); | |
1800 | ||
1801 | regulator->uA_load = uA_load; | |
1802 | ret = regulator_check_drms(rdev); | |
1803 | if (ret < 0) | |
1804 | goto out; | |
1805 | ret = -EINVAL; | |
1806 | ||
1807 | /* sanity check */ | |
1808 | if (!rdev->desc->ops->get_optimum_mode) | |
1809 | goto out; | |
1810 | ||
1811 | /* get output voltage */ | |
1812 | output_uV = rdev->desc->ops->get_voltage(rdev); | |
1813 | if (output_uV <= 0) { | |
1814 | printk(KERN_ERR "%s: invalid output voltage found for %s\n", | |
1083c393 | 1815 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1816 | goto out; |
1817 | } | |
1818 | ||
1819 | /* get input voltage */ | |
1820 | if (rdev->supply && rdev->supply->desc->ops->get_voltage) | |
1821 | input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); | |
1822 | else | |
1823 | input_uV = rdev->constraints->input_uV; | |
1824 | if (input_uV <= 0) { | |
1825 | printk(KERN_ERR "%s: invalid input voltage found for %s\n", | |
1083c393 | 1826 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
1827 | goto out; |
1828 | } | |
1829 | ||
1830 | /* calc total requested load for this regulator */ | |
1831 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 1832 | total_uA_load += consumer->uA_load; |
414c70cb LG |
1833 | |
1834 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
1835 | input_uV, output_uV, | |
1836 | total_uA_load); | |
e573520b DB |
1837 | ret = regulator_check_mode(rdev, mode); |
1838 | if (ret < 0) { | |
414c70cb | 1839 | printk(KERN_ERR "%s: failed to get optimum mode for %s @" |
1083c393 | 1840 | " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), |
414c70cb LG |
1841 | total_uA_load, input_uV, output_uV); |
1842 | goto out; | |
1843 | } | |
1844 | ||
1845 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 1846 | if (ret < 0) { |
414c70cb | 1847 | printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", |
1083c393 | 1848 | __func__, mode, rdev_get_name(rdev)); |
414c70cb LG |
1849 | goto out; |
1850 | } | |
1851 | ret = mode; | |
1852 | out: | |
1853 | mutex_unlock(&rdev->mutex); | |
1854 | return ret; | |
1855 | } | |
1856 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
1857 | ||
1858 | /** | |
1859 | * regulator_register_notifier - register regulator event notifier | |
1860 | * @regulator: regulator source | |
69279fb9 | 1861 | * @nb: notifier block |
414c70cb LG |
1862 | * |
1863 | * Register notifier block to receive regulator events. | |
1864 | */ | |
1865 | int regulator_register_notifier(struct regulator *regulator, | |
1866 | struct notifier_block *nb) | |
1867 | { | |
1868 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
1869 | nb); | |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
1872 | ||
1873 | /** | |
1874 | * regulator_unregister_notifier - unregister regulator event notifier | |
1875 | * @regulator: regulator source | |
69279fb9 | 1876 | * @nb: notifier block |
414c70cb LG |
1877 | * |
1878 | * Unregister regulator event notifier block. | |
1879 | */ | |
1880 | int regulator_unregister_notifier(struct regulator *regulator, | |
1881 | struct notifier_block *nb) | |
1882 | { | |
1883 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
1884 | nb); | |
1885 | } | |
1886 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
1887 | ||
b136fb44 JC |
1888 | /* notify regulator consumers and downstream regulator consumers. |
1889 | * Note mutex must be held by caller. | |
1890 | */ | |
414c70cb LG |
1891 | static void _notifier_call_chain(struct regulator_dev *rdev, |
1892 | unsigned long event, void *data) | |
1893 | { | |
1894 | struct regulator_dev *_rdev; | |
1895 | ||
1896 | /* call rdev chain first */ | |
414c70cb | 1897 | blocking_notifier_call_chain(&rdev->notifier, event, NULL); |
414c70cb LG |
1898 | |
1899 | /* now notify regulator we supply */ | |
b136fb44 | 1900 | list_for_each_entry(_rdev, &rdev->supply_list, slist) { |
fa2984d4 SR |
1901 | mutex_lock(&_rdev->mutex); |
1902 | _notifier_call_chain(_rdev, event, data); | |
1903 | mutex_unlock(&_rdev->mutex); | |
b136fb44 | 1904 | } |
414c70cb LG |
1905 | } |
1906 | ||
1907 | /** | |
1908 | * regulator_bulk_get - get multiple regulator consumers | |
1909 | * | |
1910 | * @dev: Device to supply | |
1911 | * @num_consumers: Number of consumers to register | |
1912 | * @consumers: Configuration of consumers; clients are stored here. | |
1913 | * | |
1914 | * @return 0 on success, an errno on failure. | |
1915 | * | |
1916 | * This helper function allows drivers to get several regulator | |
1917 | * consumers in one operation. If any of the regulators cannot be | |
1918 | * acquired then any regulators that were allocated will be freed | |
1919 | * before returning to the caller. | |
1920 | */ | |
1921 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
1922 | struct regulator_bulk_data *consumers) | |
1923 | { | |
1924 | int i; | |
1925 | int ret; | |
1926 | ||
1927 | for (i = 0; i < num_consumers; i++) | |
1928 | consumers[i].consumer = NULL; | |
1929 | ||
1930 | for (i = 0; i < num_consumers; i++) { | |
1931 | consumers[i].consumer = regulator_get(dev, | |
1932 | consumers[i].supply); | |
1933 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 1934 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
1935 | dev_err(dev, "Failed to get supply '%s': %d\n", |
1936 | consumers[i].supply, ret); | |
414c70cb LG |
1937 | consumers[i].consumer = NULL; |
1938 | goto err; | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | return 0; | |
1943 | ||
1944 | err: | |
1945 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
1946 | regulator_put(consumers[i].consumer); | |
1947 | ||
1948 | return ret; | |
1949 | } | |
1950 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
1951 | ||
1952 | /** | |
1953 | * regulator_bulk_enable - enable multiple regulator consumers | |
1954 | * | |
1955 | * @num_consumers: Number of consumers | |
1956 | * @consumers: Consumer data; clients are stored here. | |
1957 | * @return 0 on success, an errno on failure | |
1958 | * | |
1959 | * This convenience API allows consumers to enable multiple regulator | |
1960 | * clients in a single API call. If any consumers cannot be enabled | |
1961 | * then any others that were enabled will be disabled again prior to | |
1962 | * return. | |
1963 | */ | |
1964 | int regulator_bulk_enable(int num_consumers, | |
1965 | struct regulator_bulk_data *consumers) | |
1966 | { | |
1967 | int i; | |
1968 | int ret; | |
1969 | ||
1970 | for (i = 0; i < num_consumers; i++) { | |
1971 | ret = regulator_enable(consumers[i].consumer); | |
1972 | if (ret != 0) | |
1973 | goto err; | |
1974 | } | |
1975 | ||
1976 | return 0; | |
1977 | ||
1978 | err: | |
5b307627 | 1979 | printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); |
eb143ac1 | 1980 | for (--i; i >= 0; --i) |
414c70cb LG |
1981 | regulator_disable(consumers[i].consumer); |
1982 | ||
1983 | return ret; | |
1984 | } | |
1985 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
1986 | ||
1987 | /** | |
1988 | * regulator_bulk_disable - disable multiple regulator consumers | |
1989 | * | |
1990 | * @num_consumers: Number of consumers | |
1991 | * @consumers: Consumer data; clients are stored here. | |
1992 | * @return 0 on success, an errno on failure | |
1993 | * | |
1994 | * This convenience API allows consumers to disable multiple regulator | |
1995 | * clients in a single API call. If any consumers cannot be enabled | |
1996 | * then any others that were disabled will be disabled again prior to | |
1997 | * return. | |
1998 | */ | |
1999 | int regulator_bulk_disable(int num_consumers, | |
2000 | struct regulator_bulk_data *consumers) | |
2001 | { | |
2002 | int i; | |
2003 | int ret; | |
2004 | ||
2005 | for (i = 0; i < num_consumers; i++) { | |
2006 | ret = regulator_disable(consumers[i].consumer); | |
2007 | if (ret != 0) | |
2008 | goto err; | |
2009 | } | |
2010 | ||
2011 | return 0; | |
2012 | ||
2013 | err: | |
5b307627 MB |
2014 | printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, |
2015 | ret); | |
eb143ac1 | 2016 | for (--i; i >= 0; --i) |
414c70cb LG |
2017 | regulator_enable(consumers[i].consumer); |
2018 | ||
2019 | return ret; | |
2020 | } | |
2021 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
2022 | ||
2023 | /** | |
2024 | * regulator_bulk_free - free multiple regulator consumers | |
2025 | * | |
2026 | * @num_consumers: Number of consumers | |
2027 | * @consumers: Consumer data; clients are stored here. | |
2028 | * | |
2029 | * This convenience API allows consumers to free multiple regulator | |
2030 | * clients in a single API call. | |
2031 | */ | |
2032 | void regulator_bulk_free(int num_consumers, | |
2033 | struct regulator_bulk_data *consumers) | |
2034 | { | |
2035 | int i; | |
2036 | ||
2037 | for (i = 0; i < num_consumers; i++) { | |
2038 | regulator_put(consumers[i].consumer); | |
2039 | consumers[i].consumer = NULL; | |
2040 | } | |
2041 | } | |
2042 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
2043 | ||
2044 | /** | |
2045 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 2046 | * @rdev: regulator source |
414c70cb | 2047 | * @event: notifier block |
69279fb9 | 2048 | * @data: callback-specific data. |
414c70cb LG |
2049 | * |
2050 | * Called by regulator drivers to notify clients a regulator event has | |
2051 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 2052 | * Note lock must be held by caller. |
414c70cb LG |
2053 | */ |
2054 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
2055 | unsigned long event, void *data) | |
2056 | { | |
2057 | _notifier_call_chain(rdev, event, data); | |
2058 | return NOTIFY_DONE; | |
2059 | ||
2060 | } | |
2061 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
2062 | ||
be721979 MB |
2063 | /** |
2064 | * regulator_mode_to_status - convert a regulator mode into a status | |
2065 | * | |
2066 | * @mode: Mode to convert | |
2067 | * | |
2068 | * Convert a regulator mode into a status. | |
2069 | */ | |
2070 | int regulator_mode_to_status(unsigned int mode) | |
2071 | { | |
2072 | switch (mode) { | |
2073 | case REGULATOR_MODE_FAST: | |
2074 | return REGULATOR_STATUS_FAST; | |
2075 | case REGULATOR_MODE_NORMAL: | |
2076 | return REGULATOR_STATUS_NORMAL; | |
2077 | case REGULATOR_MODE_IDLE: | |
2078 | return REGULATOR_STATUS_IDLE; | |
2079 | case REGULATOR_STATUS_STANDBY: | |
2080 | return REGULATOR_STATUS_STANDBY; | |
2081 | default: | |
2082 | return 0; | |
2083 | } | |
2084 | } | |
2085 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
2086 | ||
7ad68e2f DB |
2087 | /* |
2088 | * To avoid cluttering sysfs (and memory) with useless state, only | |
2089 | * create attributes that can be meaningfully displayed. | |
2090 | */ | |
2091 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
2092 | { | |
2093 | struct device *dev = &rdev->dev; | |
2094 | struct regulator_ops *ops = rdev->desc->ops; | |
2095 | int status = 0; | |
2096 | ||
2097 | /* some attributes need specific methods to be displayed */ | |
2098 | if (ops->get_voltage) { | |
2099 | status = device_create_file(dev, &dev_attr_microvolts); | |
2100 | if (status < 0) | |
2101 | return status; | |
2102 | } | |
2103 | if (ops->get_current_limit) { | |
2104 | status = device_create_file(dev, &dev_attr_microamps); | |
2105 | if (status < 0) | |
2106 | return status; | |
2107 | } | |
2108 | if (ops->get_mode) { | |
2109 | status = device_create_file(dev, &dev_attr_opmode); | |
2110 | if (status < 0) | |
2111 | return status; | |
2112 | } | |
2113 | if (ops->is_enabled) { | |
2114 | status = device_create_file(dev, &dev_attr_state); | |
2115 | if (status < 0) | |
2116 | return status; | |
2117 | } | |
853116a1 DB |
2118 | if (ops->get_status) { |
2119 | status = device_create_file(dev, &dev_attr_status); | |
2120 | if (status < 0) | |
2121 | return status; | |
2122 | } | |
7ad68e2f DB |
2123 | |
2124 | /* some attributes are type-specific */ | |
2125 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
2126 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
2127 | if (status < 0) | |
2128 | return status; | |
2129 | } | |
2130 | ||
2131 | /* all the other attributes exist to support constraints; | |
2132 | * don't show them if there are no constraints, or if the | |
2133 | * relevant supporting methods are missing. | |
2134 | */ | |
2135 | if (!rdev->constraints) | |
2136 | return status; | |
2137 | ||
2138 | /* constraints need specific supporting methods */ | |
2139 | if (ops->set_voltage) { | |
2140 | status = device_create_file(dev, &dev_attr_min_microvolts); | |
2141 | if (status < 0) | |
2142 | return status; | |
2143 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
2144 | if (status < 0) | |
2145 | return status; | |
2146 | } | |
2147 | if (ops->set_current_limit) { | |
2148 | status = device_create_file(dev, &dev_attr_min_microamps); | |
2149 | if (status < 0) | |
2150 | return status; | |
2151 | status = device_create_file(dev, &dev_attr_max_microamps); | |
2152 | if (status < 0) | |
2153 | return status; | |
2154 | } | |
2155 | ||
2156 | /* suspend mode constraints need multiple supporting methods */ | |
2157 | if (!(ops->set_suspend_enable && ops->set_suspend_disable)) | |
2158 | return status; | |
2159 | ||
2160 | status = device_create_file(dev, &dev_attr_suspend_standby_state); | |
2161 | if (status < 0) | |
2162 | return status; | |
2163 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
2164 | if (status < 0) | |
2165 | return status; | |
2166 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
2167 | if (status < 0) | |
2168 | return status; | |
2169 | ||
2170 | if (ops->set_suspend_voltage) { | |
2171 | status = device_create_file(dev, | |
2172 | &dev_attr_suspend_standby_microvolts); | |
2173 | if (status < 0) | |
2174 | return status; | |
2175 | status = device_create_file(dev, | |
2176 | &dev_attr_suspend_mem_microvolts); | |
2177 | if (status < 0) | |
2178 | return status; | |
2179 | status = device_create_file(dev, | |
2180 | &dev_attr_suspend_disk_microvolts); | |
2181 | if (status < 0) | |
2182 | return status; | |
2183 | } | |
2184 | ||
2185 | if (ops->set_suspend_mode) { | |
2186 | status = device_create_file(dev, | |
2187 | &dev_attr_suspend_standby_mode); | |
2188 | if (status < 0) | |
2189 | return status; | |
2190 | status = device_create_file(dev, | |
2191 | &dev_attr_suspend_mem_mode); | |
2192 | if (status < 0) | |
2193 | return status; | |
2194 | status = device_create_file(dev, | |
2195 | &dev_attr_suspend_disk_mode); | |
2196 | if (status < 0) | |
2197 | return status; | |
2198 | } | |
2199 | ||
2200 | return status; | |
2201 | } | |
2202 | ||
414c70cb LG |
2203 | /** |
2204 | * regulator_register - register regulator | |
69279fb9 MB |
2205 | * @regulator_desc: regulator to register |
2206 | * @dev: struct device for the regulator | |
0527100f | 2207 | * @init_data: platform provided init data, passed through by driver |
69279fb9 | 2208 | * @driver_data: private regulator data |
414c70cb LG |
2209 | * |
2210 | * Called by regulator drivers to register a regulator. | |
2211 | * Returns 0 on success. | |
2212 | */ | |
2213 | struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, | |
0527100f MB |
2214 | struct device *dev, struct regulator_init_data *init_data, |
2215 | void *driver_data) | |
414c70cb LG |
2216 | { |
2217 | static atomic_t regulator_no = ATOMIC_INIT(0); | |
2218 | struct regulator_dev *rdev; | |
a5766f11 | 2219 | int ret, i; |
414c70cb LG |
2220 | |
2221 | if (regulator_desc == NULL) | |
2222 | return ERR_PTR(-EINVAL); | |
2223 | ||
2224 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) | |
2225 | return ERR_PTR(-EINVAL); | |
2226 | ||
cd78dfc6 DL |
2227 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
2228 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
2229 | return ERR_PTR(-EINVAL); |
2230 | ||
46fabe1e MB |
2231 | if (!init_data) |
2232 | return ERR_PTR(-EINVAL); | |
2233 | ||
414c70cb LG |
2234 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
2235 | if (rdev == NULL) | |
2236 | return ERR_PTR(-ENOMEM); | |
2237 | ||
2238 | mutex_lock(®ulator_list_mutex); | |
2239 | ||
2240 | mutex_init(&rdev->mutex); | |
a5766f11 | 2241 | rdev->reg_data = driver_data; |
414c70cb LG |
2242 | rdev->owner = regulator_desc->owner; |
2243 | rdev->desc = regulator_desc; | |
2244 | INIT_LIST_HEAD(&rdev->consumer_list); | |
2245 | INIT_LIST_HEAD(&rdev->supply_list); | |
2246 | INIT_LIST_HEAD(&rdev->list); | |
2247 | INIT_LIST_HEAD(&rdev->slist); | |
2248 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); | |
2249 | ||
a5766f11 LG |
2250 | /* preform any regulator specific init */ |
2251 | if (init_data->regulator_init) { | |
2252 | ret = init_data->regulator_init(rdev->reg_data); | |
4fca9545 DB |
2253 | if (ret < 0) |
2254 | goto clean; | |
a5766f11 LG |
2255 | } |
2256 | ||
a5766f11 | 2257 | /* register with sysfs */ |
414c70cb | 2258 | rdev->dev.class = ®ulator_class; |
a5766f11 | 2259 | rdev->dev.parent = dev; |
812460a9 KS |
2260 | dev_set_name(&rdev->dev, "regulator.%d", |
2261 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 2262 | ret = device_register(&rdev->dev); |
4fca9545 DB |
2263 | if (ret != 0) |
2264 | goto clean; | |
a5766f11 LG |
2265 | |
2266 | dev_set_drvdata(&rdev->dev, rdev); | |
2267 | ||
74f544c1 MR |
2268 | /* set regulator constraints */ |
2269 | ret = set_machine_constraints(rdev, &init_data->constraints); | |
2270 | if (ret < 0) | |
2271 | goto scrub; | |
2272 | ||
7ad68e2f DB |
2273 | /* add attributes supported by this regulator */ |
2274 | ret = add_regulator_attributes(rdev); | |
2275 | if (ret < 0) | |
2276 | goto scrub; | |
2277 | ||
a5766f11 LG |
2278 | /* set supply regulator if it exists */ |
2279 | if (init_data->supply_regulator_dev) { | |
2280 | ret = set_supply(rdev, | |
2281 | dev_get_drvdata(init_data->supply_regulator_dev)); | |
4fca9545 DB |
2282 | if (ret < 0) |
2283 | goto scrub; | |
a5766f11 LG |
2284 | } |
2285 | ||
2286 | /* add consumers devices */ | |
2287 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
2288 | ret = set_consumer_device_supply(rdev, | |
2289 | init_data->consumer_supplies[i].dev, | |
40f9244f | 2290 | init_data->consumer_supplies[i].dev_name, |
a5766f11 LG |
2291 | init_data->consumer_supplies[i].supply); |
2292 | if (ret < 0) { | |
2293 | for (--i; i >= 0; i--) | |
2294 | unset_consumer_device_supply(rdev, | |
40f9244f MB |
2295 | init_data->consumer_supplies[i].dev_name, |
2296 | init_data->consumer_supplies[i].dev); | |
4fca9545 | 2297 | goto scrub; |
a5766f11 | 2298 | } |
414c70cb | 2299 | } |
a5766f11 LG |
2300 | |
2301 | list_add(&rdev->list, ®ulator_list); | |
2302 | out: | |
414c70cb LG |
2303 | mutex_unlock(®ulator_list_mutex); |
2304 | return rdev; | |
4fca9545 DB |
2305 | |
2306 | scrub: | |
2307 | device_unregister(&rdev->dev); | |
53032daf PW |
2308 | /* device core frees rdev */ |
2309 | rdev = ERR_PTR(ret); | |
2310 | goto out; | |
2311 | ||
4fca9545 DB |
2312 | clean: |
2313 | kfree(rdev); | |
2314 | rdev = ERR_PTR(ret); | |
2315 | goto out; | |
414c70cb LG |
2316 | } |
2317 | EXPORT_SYMBOL_GPL(regulator_register); | |
2318 | ||
2319 | /** | |
2320 | * regulator_unregister - unregister regulator | |
69279fb9 | 2321 | * @rdev: regulator to unregister |
414c70cb LG |
2322 | * |
2323 | * Called by regulator drivers to unregister a regulator. | |
2324 | */ | |
2325 | void regulator_unregister(struct regulator_dev *rdev) | |
2326 | { | |
2327 | if (rdev == NULL) | |
2328 | return; | |
2329 | ||
2330 | mutex_lock(®ulator_list_mutex); | |
6bf87d17 | 2331 | WARN_ON(rdev->open_count); |
0f1d747b | 2332 | unset_regulator_supplies(rdev); |
414c70cb LG |
2333 | list_del(&rdev->list); |
2334 | if (rdev->supply) | |
2335 | sysfs_remove_link(&rdev->dev.kobj, "supply"); | |
2336 | device_unregister(&rdev->dev); | |
2337 | mutex_unlock(®ulator_list_mutex); | |
2338 | } | |
2339 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
2340 | ||
414c70cb | 2341 | /** |
cf7bbcdf | 2342 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
2343 | * @state: system suspend state |
2344 | * | |
2345 | * Configure each regulator with it's suspend operating parameters for state. | |
2346 | * This will usually be called by machine suspend code prior to supending. | |
2347 | */ | |
2348 | int regulator_suspend_prepare(suspend_state_t state) | |
2349 | { | |
2350 | struct regulator_dev *rdev; | |
2351 | int ret = 0; | |
2352 | ||
2353 | /* ON is handled by regulator active state */ | |
2354 | if (state == PM_SUSPEND_ON) | |
2355 | return -EINVAL; | |
2356 | ||
2357 | mutex_lock(®ulator_list_mutex); | |
2358 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2359 | ||
2360 | mutex_lock(&rdev->mutex); | |
2361 | ret = suspend_prepare(rdev, state); | |
2362 | mutex_unlock(&rdev->mutex); | |
2363 | ||
2364 | if (ret < 0) { | |
2365 | printk(KERN_ERR "%s: failed to prepare %s\n", | |
1083c393 | 2366 | __func__, rdev_get_name(rdev)); |
414c70cb LG |
2367 | goto out; |
2368 | } | |
2369 | } | |
2370 | out: | |
2371 | mutex_unlock(®ulator_list_mutex); | |
2372 | return ret; | |
2373 | } | |
2374 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
2375 | ||
ca725561 MB |
2376 | /** |
2377 | * regulator_has_full_constraints - the system has fully specified constraints | |
2378 | * | |
2379 | * Calling this function will cause the regulator API to disable all | |
2380 | * regulators which have a zero use count and don't have an always_on | |
2381 | * constraint in a late_initcall. | |
2382 | * | |
2383 | * The intention is that this will become the default behaviour in a | |
2384 | * future kernel release so users are encouraged to use this facility | |
2385 | * now. | |
2386 | */ | |
2387 | void regulator_has_full_constraints(void) | |
2388 | { | |
2389 | has_full_constraints = 1; | |
2390 | } | |
2391 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
2392 | ||
414c70cb LG |
2393 | /** |
2394 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 2395 | * @rdev: regulator |
414c70cb LG |
2396 | * |
2397 | * Get rdev regulator driver private data. This call can be used in the | |
2398 | * regulator driver context. | |
2399 | */ | |
2400 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
2401 | { | |
2402 | return rdev->reg_data; | |
2403 | } | |
2404 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
2405 | ||
2406 | /** | |
2407 | * regulator_get_drvdata - get regulator driver data | |
2408 | * @regulator: regulator | |
2409 | * | |
2410 | * Get regulator driver private data. This call can be used in the consumer | |
2411 | * driver context when non API regulator specific functions need to be called. | |
2412 | */ | |
2413 | void *regulator_get_drvdata(struct regulator *regulator) | |
2414 | { | |
2415 | return regulator->rdev->reg_data; | |
2416 | } | |
2417 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
2418 | ||
2419 | /** | |
2420 | * regulator_set_drvdata - set regulator driver data | |
2421 | * @regulator: regulator | |
2422 | * @data: data | |
2423 | */ | |
2424 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
2425 | { | |
2426 | regulator->rdev->reg_data = data; | |
2427 | } | |
2428 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
2429 | ||
2430 | /** | |
2431 | * regulator_get_id - get regulator ID | |
69279fb9 | 2432 | * @rdev: regulator |
414c70cb LG |
2433 | */ |
2434 | int rdev_get_id(struct regulator_dev *rdev) | |
2435 | { | |
2436 | return rdev->desc->id; | |
2437 | } | |
2438 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
2439 | ||
a5766f11 LG |
2440 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
2441 | { | |
2442 | return &rdev->dev; | |
2443 | } | |
2444 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
2445 | ||
2446 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
2447 | { | |
2448 | return reg_init_data->driver_data; | |
2449 | } | |
2450 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
2451 | ||
414c70cb LG |
2452 | static int __init regulator_init(void) |
2453 | { | |
2454 | printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); | |
2455 | return class_register(®ulator_class); | |
2456 | } | |
2457 | ||
2458 | /* init early to allow our consumers to complete system booting */ | |
2459 | core_initcall(regulator_init); | |
ca725561 MB |
2460 | |
2461 | static int __init regulator_init_complete(void) | |
2462 | { | |
2463 | struct regulator_dev *rdev; | |
2464 | struct regulator_ops *ops; | |
2465 | struct regulation_constraints *c; | |
2466 | int enabled, ret; | |
2467 | const char *name; | |
2468 | ||
2469 | mutex_lock(®ulator_list_mutex); | |
2470 | ||
2471 | /* If we have a full configuration then disable any regulators | |
2472 | * which are not in use or always_on. This will become the | |
2473 | * default behaviour in the future. | |
2474 | */ | |
2475 | list_for_each_entry(rdev, ®ulator_list, list) { | |
2476 | ops = rdev->desc->ops; | |
2477 | c = rdev->constraints; | |
2478 | ||
1083c393 | 2479 | name = rdev_get_name(rdev); |
ca725561 | 2480 | |
f25e0b4f | 2481 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
2482 | continue; |
2483 | ||
2484 | mutex_lock(&rdev->mutex); | |
2485 | ||
2486 | if (rdev->use_count) | |
2487 | goto unlock; | |
2488 | ||
2489 | /* If we can't read the status assume it's on. */ | |
2490 | if (ops->is_enabled) | |
2491 | enabled = ops->is_enabled(rdev); | |
2492 | else | |
2493 | enabled = 1; | |
2494 | ||
2495 | if (!enabled) | |
2496 | goto unlock; | |
2497 | ||
2498 | if (has_full_constraints) { | |
2499 | /* We log since this may kill the system if it | |
2500 | * goes wrong. */ | |
2501 | printk(KERN_INFO "%s: disabling %s\n", | |
2502 | __func__, name); | |
2503 | ret = ops->disable(rdev); | |
2504 | if (ret != 0) { | |
2505 | printk(KERN_ERR | |
2506 | "%s: couldn't disable %s: %d\n", | |
2507 | __func__, name, ret); | |
2508 | } | |
2509 | } else { | |
2510 | /* The intention is that in future we will | |
2511 | * assume that full constraints are provided | |
2512 | * so warn even if we aren't going to do | |
2513 | * anything here. | |
2514 | */ | |
2515 | printk(KERN_WARNING | |
2516 | "%s: incomplete constraints, leaving %s on\n", | |
2517 | __func__, name); | |
2518 | } | |
2519 | ||
2520 | unlock: | |
2521 | mutex_unlock(&rdev->mutex); | |
2522 | } | |
2523 | ||
2524 | mutex_unlock(®ulator_list_mutex); | |
2525 | ||
2526 | return 0; | |
2527 | } | |
2528 | late_initcall(regulator_init_complete); |