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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> | |
1130e5b3 | 18 | #include <linux/debugfs.h> |
414c70cb | 19 | #include <linux/device.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
f21e0e81 | 21 | #include <linux/async.h> |
414c70cb LG |
22 | #include <linux/err.h> |
23 | #include <linux/mutex.h> | |
24 | #include <linux/suspend.h> | |
31aae2be | 25 | #include <linux/delay.h> |
65f73508 | 26 | #include <linux/gpio.h> |
69511a45 | 27 | #include <linux/of.h> |
65b19ce6 | 28 | #include <linux/regmap.h> |
69511a45 | 29 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
30 | #include <linux/regulator/consumer.h> |
31 | #include <linux/regulator/driver.h> | |
32 | #include <linux/regulator/machine.h> | |
65602c32 | 33 | #include <linux/module.h> |
414c70cb | 34 | |
02fa3ec0 MB |
35 | #define CREATE_TRACE_POINTS |
36 | #include <trace/events/regulator.h> | |
37 | ||
34abbd68 MB |
38 | #include "dummy.h" |
39 | ||
7d51a0db MB |
40 | #define rdev_crit(rdev, fmt, ...) \ |
41 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
42 | #define rdev_err(rdev, fmt, ...) \ |
43 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
44 | #define rdev_warn(rdev, fmt, ...) \ | |
45 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_info(rdev, fmt, ...) \ | |
47 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_dbg(rdev, fmt, ...) \ | |
49 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | ||
414c70cb LG |
51 | static DEFINE_MUTEX(regulator_list_mutex); |
52 | static LIST_HEAD(regulator_list); | |
53 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 54 | static LIST_HEAD(regulator_ena_gpio_list); |
21cf891a | 55 | static bool has_full_constraints; |
688fe99a | 56 | static bool board_wants_dummy_regulator; |
414c70cb | 57 | |
1130e5b3 | 58 | static struct dentry *debugfs_root; |
1130e5b3 | 59 | |
8dc5390d | 60 | /* |
414c70cb LG |
61 | * struct regulator_map |
62 | * | |
63 | * Used to provide symbolic supply names to devices. | |
64 | */ | |
65 | struct regulator_map { | |
66 | struct list_head list; | |
40f9244f | 67 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 68 | const char *supply; |
a5766f11 | 69 | struct regulator_dev *regulator; |
414c70cb LG |
70 | }; |
71 | ||
f19b00da KM |
72 | /* |
73 | * struct regulator_enable_gpio | |
74 | * | |
75 | * Management for shared enable GPIO pin | |
76 | */ | |
77 | struct regulator_enable_gpio { | |
78 | struct list_head list; | |
79 | int gpio; | |
80 | u32 enable_count; /* a number of enabled shared GPIO */ | |
81 | u32 request_count; /* a number of requested shared GPIO */ | |
82 | unsigned int ena_gpio_invert:1; | |
83 | }; | |
84 | ||
414c70cb LG |
85 | /* |
86 | * struct regulator | |
87 | * | |
88 | * One for each consumer device. | |
89 | */ | |
90 | struct regulator { | |
91 | struct device *dev; | |
92 | struct list_head list; | |
6492bc1b | 93 | unsigned int always_on:1; |
f59c8f9f | 94 | unsigned int bypass:1; |
414c70cb LG |
95 | int uA_load; |
96 | int min_uV; | |
97 | int max_uV; | |
414c70cb LG |
98 | char *supply_name; |
99 | struct device_attribute dev_attr; | |
100 | struct regulator_dev *rdev; | |
5de70519 | 101 | struct dentry *debugfs; |
414c70cb LG |
102 | }; |
103 | ||
104 | static int _regulator_is_enabled(struct regulator_dev *rdev); | |
3801b86a | 105 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
106 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
107 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
108 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
109 | static void _notifier_call_chain(struct regulator_dev *rdev, | |
110 | unsigned long event, void *data); | |
75790251 MB |
111 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
112 | int min_uV, int max_uV); | |
3801b86a MB |
113 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
114 | struct device *dev, | |
115 | const char *supply_name); | |
414c70cb | 116 | |
1083c393 MB |
117 | static const char *rdev_get_name(struct regulator_dev *rdev) |
118 | { | |
119 | if (rdev->constraints && rdev->constraints->name) | |
120 | return rdev->constraints->name; | |
121 | else if (rdev->desc->name) | |
122 | return rdev->desc->name; | |
123 | else | |
124 | return ""; | |
125 | } | |
126 | ||
69511a45 RN |
127 | /** |
128 | * of_get_regulator - get a regulator device node based on supply name | |
129 | * @dev: Device pointer for the consumer (of regulator) device | |
130 | * @supply: regulator supply name | |
131 | * | |
132 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 133 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
134 | * returns NULL. |
135 | */ | |
136 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
137 | { | |
138 | struct device_node *regnode = NULL; | |
139 | char prop_name[32]; /* 32 is max size of property name */ | |
140 | ||
141 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
142 | ||
143 | snprintf(prop_name, 32, "%s-supply", supply); | |
144 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
145 | ||
146 | if (!regnode) { | |
16fbcc3b | 147 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
148 | prop_name, dev->of_node->full_name); |
149 | return NULL; | |
150 | } | |
151 | return regnode; | |
152 | } | |
153 | ||
6492bc1b MB |
154 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
155 | { | |
156 | if (!rdev->constraints) | |
157 | return 0; | |
158 | ||
159 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
160 | return 1; | |
161 | else | |
162 | return 0; | |
163 | } | |
164 | ||
414c70cb LG |
165 | /* Platform voltage constraint check */ |
166 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
167 | int *min_uV, int *max_uV) | |
168 | { | |
169 | BUG_ON(*min_uV > *max_uV); | |
170 | ||
171 | if (!rdev->constraints) { | |
5da84fd9 | 172 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
173 | return -ENODEV; |
174 | } | |
175 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 176 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
177 | return -EPERM; |
178 | } | |
179 | ||
180 | if (*max_uV > rdev->constraints->max_uV) | |
181 | *max_uV = rdev->constraints->max_uV; | |
182 | if (*min_uV < rdev->constraints->min_uV) | |
183 | *min_uV = rdev->constraints->min_uV; | |
184 | ||
89f425ed MB |
185 | if (*min_uV > *max_uV) { |
186 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 187 | *min_uV, *max_uV); |
414c70cb | 188 | return -EINVAL; |
89f425ed | 189 | } |
414c70cb LG |
190 | |
191 | return 0; | |
192 | } | |
193 | ||
05fda3b1 TP |
194 | /* Make sure we select a voltage that suits the needs of all |
195 | * regulator consumers | |
196 | */ | |
197 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
198 | int *min_uV, int *max_uV) | |
199 | { | |
200 | struct regulator *regulator; | |
201 | ||
202 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
203 | /* |
204 | * Assume consumers that didn't say anything are OK | |
205 | * with anything in the constraint range. | |
206 | */ | |
207 | if (!regulator->min_uV && !regulator->max_uV) | |
208 | continue; | |
209 | ||
05fda3b1 TP |
210 | if (*max_uV > regulator->max_uV) |
211 | *max_uV = regulator->max_uV; | |
212 | if (*min_uV < regulator->min_uV) | |
213 | *min_uV = regulator->min_uV; | |
214 | } | |
215 | ||
dd8004af | 216 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
217 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
218 | *min_uV, *max_uV); | |
05fda3b1 | 219 | return -EINVAL; |
dd8004af | 220 | } |
05fda3b1 TP |
221 | |
222 | return 0; | |
223 | } | |
224 | ||
414c70cb LG |
225 | /* current constraint check */ |
226 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
227 | int *min_uA, int *max_uA) | |
228 | { | |
229 | BUG_ON(*min_uA > *max_uA); | |
230 | ||
231 | if (!rdev->constraints) { | |
5da84fd9 | 232 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
233 | return -ENODEV; |
234 | } | |
235 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 236 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
237 | return -EPERM; |
238 | } | |
239 | ||
240 | if (*max_uA > rdev->constraints->max_uA) | |
241 | *max_uA = rdev->constraints->max_uA; | |
242 | if (*min_uA < rdev->constraints->min_uA) | |
243 | *min_uA = rdev->constraints->min_uA; | |
244 | ||
89f425ed MB |
245 | if (*min_uA > *max_uA) { |
246 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 247 | *min_uA, *max_uA); |
414c70cb | 248 | return -EINVAL; |
89f425ed | 249 | } |
414c70cb LG |
250 | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* operating mode constraint check */ | |
2c608234 | 255 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 256 | { |
2c608234 | 257 | switch (*mode) { |
e573520b DB |
258 | case REGULATOR_MODE_FAST: |
259 | case REGULATOR_MODE_NORMAL: | |
260 | case REGULATOR_MODE_IDLE: | |
261 | case REGULATOR_MODE_STANDBY: | |
262 | break; | |
263 | default: | |
89f425ed | 264 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
265 | return -EINVAL; |
266 | } | |
267 | ||
414c70cb | 268 | if (!rdev->constraints) { |
5da84fd9 | 269 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
270 | return -ENODEV; |
271 | } | |
272 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 273 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
274 | return -EPERM; |
275 | } | |
2c608234 MB |
276 | |
277 | /* The modes are bitmasks, the most power hungry modes having | |
278 | * the lowest values. If the requested mode isn't supported | |
279 | * try higher modes. */ | |
280 | while (*mode) { | |
281 | if (rdev->constraints->valid_modes_mask & *mode) | |
282 | return 0; | |
283 | *mode /= 2; | |
414c70cb | 284 | } |
2c608234 MB |
285 | |
286 | return -EINVAL; | |
414c70cb LG |
287 | } |
288 | ||
289 | /* dynamic regulator mode switching constraint check */ | |
290 | static int regulator_check_drms(struct regulator_dev *rdev) | |
291 | { | |
292 | if (!rdev->constraints) { | |
5da84fd9 | 293 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
294 | return -ENODEV; |
295 | } | |
296 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
5da84fd9 | 297 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
298 | return -EPERM; |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
414c70cb LG |
303 | static ssize_t regulator_uV_show(struct device *dev, |
304 | struct device_attribute *attr, char *buf) | |
305 | { | |
a5766f11 | 306 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
307 | ssize_t ret; |
308 | ||
309 | mutex_lock(&rdev->mutex); | |
310 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
311 | mutex_unlock(&rdev->mutex); | |
312 | ||
313 | return ret; | |
314 | } | |
7ad68e2f | 315 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
316 | |
317 | static ssize_t regulator_uA_show(struct device *dev, | |
318 | struct device_attribute *attr, char *buf) | |
319 | { | |
a5766f11 | 320 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
321 | |
322 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
323 | } | |
7ad68e2f | 324 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 325 | |
587cea27 GKH |
326 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
327 | char *buf) | |
bc558a60 MB |
328 | { |
329 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 330 | |
1083c393 | 331 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 332 | } |
587cea27 | 333 | static DEVICE_ATTR_RO(name); |
bc558a60 | 334 | |
4fca9545 | 335 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 336 | { |
414c70cb LG |
337 | switch (mode) { |
338 | case REGULATOR_MODE_FAST: | |
339 | return sprintf(buf, "fast\n"); | |
340 | case REGULATOR_MODE_NORMAL: | |
341 | return sprintf(buf, "normal\n"); | |
342 | case REGULATOR_MODE_IDLE: | |
343 | return sprintf(buf, "idle\n"); | |
344 | case REGULATOR_MODE_STANDBY: | |
345 | return sprintf(buf, "standby\n"); | |
346 | } | |
347 | return sprintf(buf, "unknown\n"); | |
348 | } | |
349 | ||
4fca9545 DB |
350 | static ssize_t regulator_opmode_show(struct device *dev, |
351 | struct device_attribute *attr, char *buf) | |
414c70cb | 352 | { |
a5766f11 | 353 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 354 | |
4fca9545 DB |
355 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
356 | } | |
7ad68e2f | 357 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
358 | |
359 | static ssize_t regulator_print_state(char *buf, int state) | |
360 | { | |
414c70cb LG |
361 | if (state > 0) |
362 | return sprintf(buf, "enabled\n"); | |
363 | else if (state == 0) | |
364 | return sprintf(buf, "disabled\n"); | |
365 | else | |
366 | return sprintf(buf, "unknown\n"); | |
367 | } | |
368 | ||
4fca9545 DB |
369 | static ssize_t regulator_state_show(struct device *dev, |
370 | struct device_attribute *attr, char *buf) | |
371 | { | |
372 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
373 | ssize_t ret; |
374 | ||
375 | mutex_lock(&rdev->mutex); | |
376 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
377 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 378 | |
9332546f | 379 | return ret; |
4fca9545 | 380 | } |
7ad68e2f | 381 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 382 | |
853116a1 DB |
383 | static ssize_t regulator_status_show(struct device *dev, |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
387 | int status; | |
388 | char *label; | |
389 | ||
390 | status = rdev->desc->ops->get_status(rdev); | |
391 | if (status < 0) | |
392 | return status; | |
393 | ||
394 | switch (status) { | |
395 | case REGULATOR_STATUS_OFF: | |
396 | label = "off"; | |
397 | break; | |
398 | case REGULATOR_STATUS_ON: | |
399 | label = "on"; | |
400 | break; | |
401 | case REGULATOR_STATUS_ERROR: | |
402 | label = "error"; | |
403 | break; | |
404 | case REGULATOR_STATUS_FAST: | |
405 | label = "fast"; | |
406 | break; | |
407 | case REGULATOR_STATUS_NORMAL: | |
408 | label = "normal"; | |
409 | break; | |
410 | case REGULATOR_STATUS_IDLE: | |
411 | label = "idle"; | |
412 | break; | |
413 | case REGULATOR_STATUS_STANDBY: | |
414 | label = "standby"; | |
415 | break; | |
f59c8f9f MB |
416 | case REGULATOR_STATUS_BYPASS: |
417 | label = "bypass"; | |
418 | break; | |
1beaf762 KG |
419 | case REGULATOR_STATUS_UNDEFINED: |
420 | label = "undefined"; | |
421 | break; | |
853116a1 DB |
422 | default: |
423 | return -ERANGE; | |
424 | } | |
425 | ||
426 | return sprintf(buf, "%s\n", label); | |
427 | } | |
428 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
429 | ||
414c70cb LG |
430 | static ssize_t regulator_min_uA_show(struct device *dev, |
431 | struct device_attribute *attr, char *buf) | |
432 | { | |
a5766f11 | 433 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
434 | |
435 | if (!rdev->constraints) | |
436 | return sprintf(buf, "constraint not defined\n"); | |
437 | ||
438 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
439 | } | |
7ad68e2f | 440 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
441 | |
442 | static ssize_t regulator_max_uA_show(struct device *dev, | |
443 | struct device_attribute *attr, char *buf) | |
444 | { | |
a5766f11 | 445 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
446 | |
447 | if (!rdev->constraints) | |
448 | return sprintf(buf, "constraint not defined\n"); | |
449 | ||
450 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
451 | } | |
7ad68e2f | 452 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
453 | |
454 | static ssize_t regulator_min_uV_show(struct device *dev, | |
455 | struct device_attribute *attr, char *buf) | |
456 | { | |
a5766f11 | 457 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
458 | |
459 | if (!rdev->constraints) | |
460 | return sprintf(buf, "constraint not defined\n"); | |
461 | ||
462 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
463 | } | |
7ad68e2f | 464 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
465 | |
466 | static ssize_t regulator_max_uV_show(struct device *dev, | |
467 | struct device_attribute *attr, char *buf) | |
468 | { | |
a5766f11 | 469 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
470 | |
471 | if (!rdev->constraints) | |
472 | return sprintf(buf, "constraint not defined\n"); | |
473 | ||
474 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
475 | } | |
7ad68e2f | 476 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
477 | |
478 | static ssize_t regulator_total_uA_show(struct device *dev, | |
479 | struct device_attribute *attr, char *buf) | |
480 | { | |
a5766f11 | 481 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
482 | struct regulator *regulator; |
483 | int uA = 0; | |
484 | ||
485 | mutex_lock(&rdev->mutex); | |
486 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 487 | uA += regulator->uA_load; |
414c70cb LG |
488 | mutex_unlock(&rdev->mutex); |
489 | return sprintf(buf, "%d\n", uA); | |
490 | } | |
7ad68e2f | 491 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 492 | |
587cea27 GKH |
493 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
494 | char *buf) | |
414c70cb | 495 | { |
a5766f11 | 496 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
497 | return sprintf(buf, "%d\n", rdev->use_count); |
498 | } | |
587cea27 | 499 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 500 | |
587cea27 GKH |
501 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
502 | char *buf) | |
414c70cb | 503 | { |
a5766f11 | 504 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
505 | |
506 | switch (rdev->desc->type) { | |
507 | case REGULATOR_VOLTAGE: | |
508 | return sprintf(buf, "voltage\n"); | |
509 | case REGULATOR_CURRENT: | |
510 | return sprintf(buf, "current\n"); | |
511 | } | |
512 | return sprintf(buf, "unknown\n"); | |
513 | } | |
587cea27 | 514 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
515 | |
516 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
517 | struct device_attribute *attr, char *buf) | |
518 | { | |
a5766f11 | 519 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 520 | |
414c70cb LG |
521 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
522 | } | |
7ad68e2f DB |
523 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
524 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
525 | |
526 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
527 | struct device_attribute *attr, char *buf) | |
528 | { | |
a5766f11 | 529 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 530 | |
414c70cb LG |
531 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
532 | } | |
7ad68e2f DB |
533 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
534 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
535 | |
536 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
537 | struct device_attribute *attr, char *buf) | |
538 | { | |
a5766f11 | 539 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 540 | |
414c70cb LG |
541 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
542 | } | |
7ad68e2f DB |
543 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
544 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 545 | |
414c70cb LG |
546 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
547 | struct device_attribute *attr, char *buf) | |
548 | { | |
a5766f11 | 549 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 550 | |
4fca9545 DB |
551 | return regulator_print_opmode(buf, |
552 | rdev->constraints->state_mem.mode); | |
414c70cb | 553 | } |
7ad68e2f DB |
554 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
555 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
556 | |
557 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
558 | struct device_attribute *attr, char *buf) | |
559 | { | |
a5766f11 | 560 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 561 | |
4fca9545 DB |
562 | return regulator_print_opmode(buf, |
563 | rdev->constraints->state_disk.mode); | |
414c70cb | 564 | } |
7ad68e2f DB |
565 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
566 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
567 | |
568 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
569 | struct device_attribute *attr, char *buf) | |
570 | { | |
a5766f11 | 571 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 572 | |
4fca9545 DB |
573 | return regulator_print_opmode(buf, |
574 | rdev->constraints->state_standby.mode); | |
414c70cb | 575 | } |
7ad68e2f DB |
576 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
577 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
578 | |
579 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
580 | struct device_attribute *attr, char *buf) | |
581 | { | |
a5766f11 | 582 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 583 | |
4fca9545 DB |
584 | return regulator_print_state(buf, |
585 | rdev->constraints->state_mem.enabled); | |
414c70cb | 586 | } |
7ad68e2f DB |
587 | static DEVICE_ATTR(suspend_mem_state, 0444, |
588 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
589 | |
590 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
a5766f11 | 593 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 594 | |
4fca9545 DB |
595 | return regulator_print_state(buf, |
596 | rdev->constraints->state_disk.enabled); | |
414c70cb | 597 | } |
7ad68e2f DB |
598 | static DEVICE_ATTR(suspend_disk_state, 0444, |
599 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
600 | |
601 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
602 | struct device_attribute *attr, char *buf) | |
603 | { | |
a5766f11 | 604 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 605 | |
4fca9545 DB |
606 | return regulator_print_state(buf, |
607 | rdev->constraints->state_standby.enabled); | |
414c70cb | 608 | } |
7ad68e2f DB |
609 | static DEVICE_ATTR(suspend_standby_state, 0444, |
610 | regulator_suspend_standby_state_show, NULL); | |
611 | ||
f59c8f9f MB |
612 | static ssize_t regulator_bypass_show(struct device *dev, |
613 | struct device_attribute *attr, char *buf) | |
614 | { | |
615 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
616 | const char *report; | |
617 | bool bypass; | |
618 | int ret; | |
619 | ||
620 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
621 | ||
622 | if (ret != 0) | |
623 | report = "unknown"; | |
624 | else if (bypass) | |
625 | report = "enabled"; | |
626 | else | |
627 | report = "disabled"; | |
628 | ||
629 | return sprintf(buf, "%s\n", report); | |
630 | } | |
631 | static DEVICE_ATTR(bypass, 0444, | |
632 | regulator_bypass_show, NULL); | |
bc558a60 | 633 | |
7ad68e2f DB |
634 | /* |
635 | * These are the only attributes are present for all regulators. | |
636 | * Other attributes are a function of regulator functionality. | |
637 | */ | |
587cea27 GKH |
638 | static struct attribute *regulator_dev_attrs[] = { |
639 | &dev_attr_name.attr, | |
640 | &dev_attr_num_users.attr, | |
641 | &dev_attr_type.attr, | |
642 | NULL, | |
414c70cb | 643 | }; |
587cea27 | 644 | ATTRIBUTE_GROUPS(regulator_dev); |
414c70cb LG |
645 | |
646 | static void regulator_dev_release(struct device *dev) | |
647 | { | |
a5766f11 | 648 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
649 | kfree(rdev); |
650 | } | |
651 | ||
652 | static struct class regulator_class = { | |
653 | .name = "regulator", | |
654 | .dev_release = regulator_dev_release, | |
587cea27 | 655 | .dev_groups = regulator_dev_groups, |
414c70cb LG |
656 | }; |
657 | ||
658 | /* Calculate the new optimum regulator operating mode based on the new total | |
659 | * consumer load. All locks held by caller */ | |
660 | static void drms_uA_update(struct regulator_dev *rdev) | |
661 | { | |
662 | struct regulator *sibling; | |
663 | int current_uA = 0, output_uV, input_uV, err; | |
664 | unsigned int mode; | |
665 | ||
666 | err = regulator_check_drms(rdev); | |
667 | if (err < 0 || !rdev->desc->ops->get_optimum_mode || | |
476c2d83 MB |
668 | (!rdev->desc->ops->get_voltage && |
669 | !rdev->desc->ops->get_voltage_sel) || | |
670 | !rdev->desc->ops->set_mode) | |
036de8ef | 671 | return; |
414c70cb LG |
672 | |
673 | /* get output voltage */ | |
1bf5a1f8 | 674 | output_uV = _regulator_get_voltage(rdev); |
414c70cb LG |
675 | if (output_uV <= 0) |
676 | return; | |
677 | ||
678 | /* get input voltage */ | |
1bf5a1f8 MB |
679 | input_uV = 0; |
680 | if (rdev->supply) | |
3f24f5ad | 681 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 682 | if (input_uV <= 0) |
414c70cb LG |
683 | input_uV = rdev->constraints->input_uV; |
684 | if (input_uV <= 0) | |
685 | return; | |
686 | ||
687 | /* calc total requested load */ | |
688 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 689 | current_uA += sibling->uA_load; |
414c70cb LG |
690 | |
691 | /* now get the optimum mode for our new total regulator load */ | |
692 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
693 | output_uV, current_uA); | |
694 | ||
695 | /* check the new mode is allowed */ | |
2c608234 | 696 | err = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
697 | if (err == 0) |
698 | rdev->desc->ops->set_mode(rdev, mode); | |
699 | } | |
700 | ||
701 | static int suspend_set_state(struct regulator_dev *rdev, | |
702 | struct regulator_state *rstate) | |
703 | { | |
704 | int ret = 0; | |
638f85c5 MB |
705 | |
706 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
707 | * only warn if the driver implements set_suspend_voltage or |
708 | * set_suspend_mode callback. | |
638f85c5 MB |
709 | */ |
710 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
711 | if (rdev->desc->ops->set_suspend_voltage || |
712 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 713 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
714 | return 0; |
715 | } | |
716 | ||
717 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 718 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
719 | return -EINVAL; |
720 | } | |
414c70cb | 721 | |
8ac0e95d | 722 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 723 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 724 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 725 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
726 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
727 | ret = 0; | |
728 | ||
414c70cb | 729 | if (ret < 0) { |
5da84fd9 | 730 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
731 | return ret; |
732 | } | |
733 | ||
734 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
735 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
736 | if (ret < 0) { | |
5da84fd9 | 737 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
738 | return ret; |
739 | } | |
740 | } | |
741 | ||
742 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
743 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
744 | if (ret < 0) { | |
5da84fd9 | 745 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
746 | return ret; |
747 | } | |
748 | } | |
749 | return ret; | |
750 | } | |
751 | ||
752 | /* locks held by caller */ | |
753 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
754 | { | |
755 | if (!rdev->constraints) | |
756 | return -EINVAL; | |
757 | ||
758 | switch (state) { | |
759 | case PM_SUSPEND_STANDBY: | |
760 | return suspend_set_state(rdev, | |
761 | &rdev->constraints->state_standby); | |
762 | case PM_SUSPEND_MEM: | |
763 | return suspend_set_state(rdev, | |
764 | &rdev->constraints->state_mem); | |
765 | case PM_SUSPEND_MAX: | |
766 | return suspend_set_state(rdev, | |
767 | &rdev->constraints->state_disk); | |
768 | default: | |
769 | return -EINVAL; | |
770 | } | |
771 | } | |
772 | ||
773 | static void print_constraints(struct regulator_dev *rdev) | |
774 | { | |
775 | struct regulation_constraints *constraints = rdev->constraints; | |
973e9a27 | 776 | char buf[80] = ""; |
8f031b48 MB |
777 | int count = 0; |
778 | int ret; | |
414c70cb | 779 | |
8f031b48 | 780 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 781 | if (constraints->min_uV == constraints->max_uV) |
8f031b48 MB |
782 | count += sprintf(buf + count, "%d mV ", |
783 | constraints->min_uV / 1000); | |
414c70cb | 784 | else |
8f031b48 MB |
785 | count += sprintf(buf + count, "%d <--> %d mV ", |
786 | constraints->min_uV / 1000, | |
787 | constraints->max_uV / 1000); | |
788 | } | |
789 | ||
790 | if (!constraints->min_uV || | |
791 | constraints->min_uV != constraints->max_uV) { | |
792 | ret = _regulator_get_voltage(rdev); | |
793 | if (ret > 0) | |
794 | count += sprintf(buf + count, "at %d mV ", ret / 1000); | |
795 | } | |
796 | ||
bf5892a8 MB |
797 | if (constraints->uV_offset) |
798 | count += sprintf(buf, "%dmV offset ", | |
799 | constraints->uV_offset / 1000); | |
800 | ||
8f031b48 | 801 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 802 | if (constraints->min_uA == constraints->max_uA) |
8f031b48 MB |
803 | count += sprintf(buf + count, "%d mA ", |
804 | constraints->min_uA / 1000); | |
414c70cb | 805 | else |
8f031b48 MB |
806 | count += sprintf(buf + count, "%d <--> %d mA ", |
807 | constraints->min_uA / 1000, | |
808 | constraints->max_uA / 1000); | |
809 | } | |
810 | ||
811 | if (!constraints->min_uA || | |
812 | constraints->min_uA != constraints->max_uA) { | |
813 | ret = _regulator_get_current_limit(rdev); | |
814 | if (ret > 0) | |
e4a6376b | 815 | count += sprintf(buf + count, "at %d mA ", ret / 1000); |
414c70cb | 816 | } |
8f031b48 | 817 | |
414c70cb LG |
818 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
819 | count += sprintf(buf + count, "fast "); | |
820 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) | |
821 | count += sprintf(buf + count, "normal "); | |
822 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) | |
823 | count += sprintf(buf + count, "idle "); | |
824 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) | |
825 | count += sprintf(buf + count, "standby"); | |
826 | ||
215b8b05 UKK |
827 | if (!count) |
828 | sprintf(buf, "no parameters"); | |
829 | ||
13ce29f8 | 830 | rdev_info(rdev, "%s\n", buf); |
4a682922 MB |
831 | |
832 | if ((constraints->min_uV != constraints->max_uV) && | |
833 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
834 | rdev_warn(rdev, | |
835 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
836 | } |
837 | ||
e79055d6 | 838 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 839 | struct regulation_constraints *constraints) |
a5766f11 | 840 | { |
e5fda26c | 841 | struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
842 | int ret; |
843 | ||
844 | /* do we need to apply the constraint voltage */ | |
845 | if (rdev->constraints->apply_uV && | |
75790251 MB |
846 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
847 | ret = _regulator_do_set_voltage(rdev, | |
848 | rdev->constraints->min_uV, | |
849 | rdev->constraints->max_uV); | |
850 | if (ret < 0) { | |
851 | rdev_err(rdev, "failed to apply %duV constraint\n", | |
852 | rdev->constraints->min_uV); | |
75790251 MB |
853 | return ret; |
854 | } | |
af5866c9 | 855 | } |
e06f5b4f | 856 | |
4367cfdc DB |
857 | /* constrain machine-level voltage specs to fit |
858 | * the actual range supported by this regulator. | |
859 | */ | |
860 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
861 | int count = rdev->desc->n_voltages; | |
862 | int i; | |
863 | int min_uV = INT_MAX; | |
864 | int max_uV = INT_MIN; | |
865 | int cmin = constraints->min_uV; | |
866 | int cmax = constraints->max_uV; | |
867 | ||
3e590918 MB |
868 | /* it's safe to autoconfigure fixed-voltage supplies |
869 | and the constraints are used by list_voltage. */ | |
4367cfdc | 870 | if (count == 1 && !cmin) { |
3e590918 | 871 | cmin = 1; |
4367cfdc | 872 | cmax = INT_MAX; |
3e590918 MB |
873 | constraints->min_uV = cmin; |
874 | constraints->max_uV = cmax; | |
4367cfdc DB |
875 | } |
876 | ||
3e2b9abd MB |
877 | /* voltage constraints are optional */ |
878 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 879 | return 0; |
3e2b9abd | 880 | |
4367cfdc | 881 | /* else require explicit machine-level constraints */ |
3e2b9abd | 882 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 883 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 884 | return -EINVAL; |
4367cfdc DB |
885 | } |
886 | ||
887 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
888 | for (i = 0; i < count; i++) { | |
889 | int value; | |
890 | ||
891 | value = ops->list_voltage(rdev, i); | |
892 | if (value <= 0) | |
893 | continue; | |
894 | ||
895 | /* maybe adjust [min_uV..max_uV] */ | |
896 | if (value >= cmin && value < min_uV) | |
897 | min_uV = value; | |
898 | if (value <= cmax && value > max_uV) | |
899 | max_uV = value; | |
900 | } | |
901 | ||
902 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
903 | if (max_uV < min_uV) { | |
fff15bef MB |
904 | rdev_err(rdev, |
905 | "unsupportable voltage constraints %u-%uuV\n", | |
906 | min_uV, max_uV); | |
e79055d6 | 907 | return -EINVAL; |
4367cfdc DB |
908 | } |
909 | ||
910 | /* use regulator's subset of machine constraints */ | |
911 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
912 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
913 | constraints->min_uV, min_uV); | |
4367cfdc DB |
914 | constraints->min_uV = min_uV; |
915 | } | |
916 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
917 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
918 | constraints->max_uV, max_uV); | |
4367cfdc DB |
919 | constraints->max_uV = max_uV; |
920 | } | |
921 | } | |
922 | ||
e79055d6 MB |
923 | return 0; |
924 | } | |
925 | ||
926 | /** | |
927 | * set_machine_constraints - sets regulator constraints | |
928 | * @rdev: regulator source | |
929 | * @constraints: constraints to apply | |
930 | * | |
931 | * Allows platform initialisation code to define and constrain | |
932 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
933 | * Constraints *must* be set by platform code in order for some | |
934 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
935 | * set_mode. | |
936 | */ | |
937 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 938 | const struct regulation_constraints *constraints) |
e79055d6 MB |
939 | { |
940 | int ret = 0; | |
e79055d6 MB |
941 | struct regulator_ops *ops = rdev->desc->ops; |
942 | ||
9a8f5e07 MB |
943 | if (constraints) |
944 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
945 | GFP_KERNEL); | |
946 | else | |
947 | rdev->constraints = kzalloc(sizeof(*constraints), | |
948 | GFP_KERNEL); | |
f8c12fe3 MB |
949 | if (!rdev->constraints) |
950 | return -ENOMEM; | |
af5866c9 | 951 | |
f8c12fe3 | 952 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
953 | if (ret != 0) |
954 | goto out; | |
955 | ||
a5766f11 | 956 | /* do we need to setup our suspend state */ |
9a8f5e07 | 957 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 958 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 959 | if (ret < 0) { |
5da84fd9 | 960 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
961 | goto out; |
962 | } | |
963 | } | |
a5766f11 | 964 | |
9a8f5e07 | 965 | if (rdev->constraints->initial_mode) { |
a308466c | 966 | if (!ops->set_mode) { |
5da84fd9 | 967 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
968 | ret = -EINVAL; |
969 | goto out; | |
970 | } | |
971 | ||
f8c12fe3 | 972 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 973 | if (ret < 0) { |
5da84fd9 | 974 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
975 | goto out; |
976 | } | |
977 | } | |
978 | ||
cacf90f2 MB |
979 | /* If the constraints say the regulator should be on at this point |
980 | * and we have control then make sure it is enabled. | |
981 | */ | |
f8c12fe3 MB |
982 | if ((rdev->constraints->always_on || rdev->constraints->boot_on) && |
983 | ops->enable) { | |
e5fda26c MB |
984 | ret = ops->enable(rdev); |
985 | if (ret < 0) { | |
5da84fd9 | 986 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
987 | goto out; |
988 | } | |
989 | } | |
990 | ||
1653ccf4 YSB |
991 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
992 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
993 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
994 | if (ret < 0) { | |
995 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
996 | goto out; | |
997 | } | |
998 | } | |
999 | ||
a5766f11 | 1000 | print_constraints(rdev); |
1a6958e7 | 1001 | return 0; |
a5766f11 | 1002 | out: |
1a6958e7 AL |
1003 | kfree(rdev->constraints); |
1004 | rdev->constraints = NULL; | |
a5766f11 LG |
1005 | return ret; |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1010 | * @rdev: regulator name |
1011 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1012 | * |
1013 | * Called by platform initialisation code to set the supply regulator for this | |
1014 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1015 | * core if it's child is enabled. | |
1016 | */ | |
1017 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1018 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1019 | { |
1020 | int err; | |
1021 | ||
3801b86a MB |
1022 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1023 | ||
1024 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); | |
32c78de8 AL |
1025 | if (rdev->supply == NULL) { |
1026 | err = -ENOMEM; | |
3801b86a | 1027 | return err; |
a5766f11 | 1028 | } |
57ad526a | 1029 | supply_rdev->open_count++; |
3801b86a MB |
1030 | |
1031 | return 0; | |
a5766f11 LG |
1032 | } |
1033 | ||
1034 | /** | |
06c63f93 | 1035 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1036 | * @rdev: regulator source |
40f9244f | 1037 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1038 | * @supply: symbolic name for supply |
a5766f11 LG |
1039 | * |
1040 | * Allows platform initialisation code to map physical regulator | |
1041 | * sources to symbolic names for supplies for use by devices. Devices | |
1042 | * should use these symbolic names to request regulators, avoiding the | |
1043 | * need to provide board-specific regulator names as platform data. | |
1044 | */ | |
1045 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1046 | const char *consumer_dev_name, |
1047 | const char *supply) | |
a5766f11 LG |
1048 | { |
1049 | struct regulator_map *node; | |
9ed2099e | 1050 | int has_dev; |
a5766f11 LG |
1051 | |
1052 | if (supply == NULL) | |
1053 | return -EINVAL; | |
1054 | ||
9ed2099e MB |
1055 | if (consumer_dev_name != NULL) |
1056 | has_dev = 1; | |
1057 | else | |
1058 | has_dev = 0; | |
1059 | ||
6001e13c | 1060 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1061 | if (node->dev_name && consumer_dev_name) { |
1062 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1063 | continue; | |
1064 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1065 | continue; |
23b5cc2a JN |
1066 | } |
1067 | ||
6001e13c DB |
1068 | if (strcmp(node->supply, supply) != 0) |
1069 | continue; | |
1070 | ||
737f360d MB |
1071 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1072 | consumer_dev_name, | |
1073 | dev_name(&node->regulator->dev), | |
1074 | node->regulator->desc->name, | |
1075 | supply, | |
1076 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1077 | return -EBUSY; |
1078 | } | |
1079 | ||
9ed2099e | 1080 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1081 | if (node == NULL) |
1082 | return -ENOMEM; | |
1083 | ||
1084 | node->regulator = rdev; | |
a5766f11 LG |
1085 | node->supply = supply; |
1086 | ||
9ed2099e MB |
1087 | if (has_dev) { |
1088 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1089 | if (node->dev_name == NULL) { | |
1090 | kfree(node); | |
1091 | return -ENOMEM; | |
1092 | } | |
40f9244f MB |
1093 | } |
1094 | ||
a5766f11 LG |
1095 | list_add(&node->list, ®ulator_map_list); |
1096 | return 0; | |
1097 | } | |
1098 | ||
0f1d747b MR |
1099 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1100 | { | |
1101 | struct regulator_map *node, *n; | |
1102 | ||
1103 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1104 | if (rdev == node->regulator) { | |
1105 | list_del(&node->list); | |
40f9244f | 1106 | kfree(node->dev_name); |
0f1d747b | 1107 | kfree(node); |
0f1d747b MR |
1108 | } |
1109 | } | |
1110 | } | |
1111 | ||
f5726ae3 | 1112 | #define REG_STR_SIZE 64 |
414c70cb LG |
1113 | |
1114 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1115 | struct device *dev, | |
1116 | const char *supply_name) | |
1117 | { | |
1118 | struct regulator *regulator; | |
1119 | char buf[REG_STR_SIZE]; | |
1120 | int err, size; | |
1121 | ||
1122 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1123 | if (regulator == NULL) | |
1124 | return NULL; | |
1125 | ||
1126 | mutex_lock(&rdev->mutex); | |
1127 | regulator->rdev = rdev; | |
1128 | list_add(®ulator->list, &rdev->consumer_list); | |
1129 | ||
1130 | if (dev) { | |
e2c98eaf SG |
1131 | regulator->dev = dev; |
1132 | ||
222cc7b1 | 1133 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1134 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1135 | dev->kobj.name, supply_name); | |
1136 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1137 | goto overflow_err; |
414c70cb LG |
1138 | |
1139 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1140 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1141 | goto overflow_err; |
414c70cb LG |
1142 | |
1143 | err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, | |
1144 | buf); | |
1145 | if (err) { | |
5da84fd9 JP |
1146 | rdev_warn(rdev, "could not add device link %s err %d\n", |
1147 | dev->kobj.name, err); | |
222cc7b1 | 1148 | /* non-fatal */ |
414c70cb | 1149 | } |
5de70519 MB |
1150 | } else { |
1151 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1152 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1153 | goto overflow_err; |
5de70519 MB |
1154 | } |
1155 | ||
5de70519 MB |
1156 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1157 | rdev->debugfs); | |
24751434 | 1158 | if (!regulator->debugfs) { |
5de70519 | 1159 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1160 | } else { |
1161 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1162 | ®ulator->uA_load); | |
1163 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1164 | ®ulator->min_uV); | |
1165 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1166 | ®ulator->max_uV); | |
414c70cb | 1167 | } |
5de70519 | 1168 | |
6492bc1b MB |
1169 | /* |
1170 | * Check now if the regulator is an always on regulator - if | |
1171 | * it is then we don't need to do nearly so much work for | |
1172 | * enable/disable calls. | |
1173 | */ | |
1174 | if (!_regulator_can_change_status(rdev) && | |
1175 | _regulator_is_enabled(rdev)) | |
1176 | regulator->always_on = true; | |
1177 | ||
414c70cb LG |
1178 | mutex_unlock(&rdev->mutex); |
1179 | return regulator; | |
414c70cb LG |
1180 | overflow_err: |
1181 | list_del(®ulator->list); | |
1182 | kfree(regulator); | |
1183 | mutex_unlock(&rdev->mutex); | |
1184 | return NULL; | |
1185 | } | |
1186 | ||
31aae2be MB |
1187 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1188 | { | |
1189 | if (!rdev->desc->ops->enable_time) | |
79511ed3 | 1190 | return rdev->desc->enable_time; |
31aae2be MB |
1191 | return rdev->desc->ops->enable_time(rdev); |
1192 | } | |
1193 | ||
69511a45 | 1194 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1195 | const char *supply, |
1196 | int *ret) | |
69511a45 RN |
1197 | { |
1198 | struct regulator_dev *r; | |
1199 | struct device_node *node; | |
576ca436 MB |
1200 | struct regulator_map *map; |
1201 | const char *devname = NULL; | |
69511a45 RN |
1202 | |
1203 | /* first do a dt based lookup */ | |
1204 | if (dev && dev->of_node) { | |
1205 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1206 | if (node) { |
69511a45 RN |
1207 | list_for_each_entry(r, ®ulator_list, list) |
1208 | if (r->dev.parent && | |
1209 | node == r->dev.of_node) | |
1210 | return r; | |
6d191a5f MB |
1211 | } else { |
1212 | /* | |
1213 | * If we couldn't even get the node then it's | |
1214 | * not just that the device didn't register | |
1215 | * yet, there's no node and we'll never | |
1216 | * succeed. | |
1217 | */ | |
1218 | *ret = -ENODEV; | |
1219 | } | |
69511a45 RN |
1220 | } |
1221 | ||
1222 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1223 | if (dev) |
1224 | devname = dev_name(dev); | |
1225 | ||
69511a45 RN |
1226 | list_for_each_entry(r, ®ulator_list, list) |
1227 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1228 | return r; | |
1229 | ||
576ca436 MB |
1230 | list_for_each_entry(map, ®ulator_map_list, list) { |
1231 | /* If the mapping has a device set up it must match */ | |
1232 | if (map->dev_name && | |
1233 | (!devname || strcmp(map->dev_name, devname))) | |
1234 | continue; | |
1235 | ||
1236 | if (strcmp(map->supply, supply) == 0) | |
1237 | return map->regulator; | |
1238 | } | |
1239 | ||
1240 | ||
69511a45 RN |
1241 | return NULL; |
1242 | } | |
1243 | ||
5ffbd136 MB |
1244 | /* Internal regulator request function */ |
1245 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
84fcf447 | 1246 | bool exclusive) |
414c70cb LG |
1247 | { |
1248 | struct regulator_dev *rdev; | |
04bf3011 | 1249 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1250 | const char *devname = NULL; |
1e4b545c | 1251 | int ret = 0; |
414c70cb LG |
1252 | |
1253 | if (id == NULL) { | |
5da84fd9 | 1254 | pr_err("get() with no identifier\n"); |
414c70cb LG |
1255 | return regulator; |
1256 | } | |
1257 | ||
40f9244f MB |
1258 | if (dev) |
1259 | devname = dev_name(dev); | |
1260 | ||
414c70cb LG |
1261 | mutex_lock(®ulator_list_mutex); |
1262 | ||
6d191a5f | 1263 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1264 | if (rdev) |
1265 | goto found; | |
1266 | ||
1e4b545c NM |
1267 | /* |
1268 | * If we have return value from dev_lookup fail, we do not expect to | |
1269 | * succeed, so, quit with appropriate error value | |
1270 | */ | |
1271 | if (ret) { | |
1272 | regulator = ERR_PTR(ret); | |
1273 | goto out; | |
1274 | } | |
1275 | ||
688fe99a MB |
1276 | if (board_wants_dummy_regulator) { |
1277 | rdev = dummy_regulator_rdev; | |
1278 | goto found; | |
1279 | } | |
1280 | ||
34abbd68 MB |
1281 | #ifdef CONFIG_REGULATOR_DUMMY |
1282 | if (!devname) | |
1283 | devname = "deviceless"; | |
1284 | ||
1285 | /* If the board didn't flag that it was fully constrained then | |
1286 | * substitute in a dummy regulator so consumers can continue. | |
1287 | */ | |
1288 | if (!has_full_constraints) { | |
5da84fd9 JP |
1289 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1290 | devname, id); | |
34abbd68 MB |
1291 | rdev = dummy_regulator_rdev; |
1292 | goto found; | |
1293 | } | |
1294 | #endif | |
1295 | ||
414c70cb LG |
1296 | mutex_unlock(®ulator_list_mutex); |
1297 | return regulator; | |
1298 | ||
1299 | found: | |
5ffbd136 MB |
1300 | if (rdev->exclusive) { |
1301 | regulator = ERR_PTR(-EPERM); | |
1302 | goto out; | |
1303 | } | |
1304 | ||
1305 | if (exclusive && rdev->open_count) { | |
1306 | regulator = ERR_PTR(-EBUSY); | |
1307 | goto out; | |
1308 | } | |
1309 | ||
a5766f11 LG |
1310 | if (!try_module_get(rdev->owner)) |
1311 | goto out; | |
1312 | ||
414c70cb LG |
1313 | regulator = create_regulator(rdev, dev, id); |
1314 | if (regulator == NULL) { | |
1315 | regulator = ERR_PTR(-ENOMEM); | |
1316 | module_put(rdev->owner); | |
bcda4321 | 1317 | goto out; |
414c70cb LG |
1318 | } |
1319 | ||
5ffbd136 MB |
1320 | rdev->open_count++; |
1321 | if (exclusive) { | |
1322 | rdev->exclusive = 1; | |
1323 | ||
1324 | ret = _regulator_is_enabled(rdev); | |
1325 | if (ret > 0) | |
1326 | rdev->use_count = 1; | |
1327 | else | |
1328 | rdev->use_count = 0; | |
1329 | } | |
1330 | ||
a5766f11 | 1331 | out: |
414c70cb | 1332 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1333 | |
414c70cb LG |
1334 | return regulator; |
1335 | } | |
5ffbd136 MB |
1336 | |
1337 | /** | |
1338 | * regulator_get - lookup and obtain a reference to a regulator. | |
1339 | * @dev: device for regulator "consumer" | |
1340 | * @id: Supply name or regulator ID. | |
1341 | * | |
1342 | * Returns a struct regulator corresponding to the regulator producer, | |
1343 | * or IS_ERR() condition containing errno. | |
1344 | * | |
1345 | * Use of supply names configured via regulator_set_device_supply() is | |
1346 | * strongly encouraged. It is recommended that the supply name used | |
1347 | * should match the name used for the supply and/or the relevant | |
1348 | * device pins in the datasheet. | |
1349 | */ | |
1350 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1351 | { | |
84fcf447 | 1352 | return _regulator_get(dev, id, false); |
5ffbd136 | 1353 | } |
414c70cb LG |
1354 | EXPORT_SYMBOL_GPL(regulator_get); |
1355 | ||
070b9079 SB |
1356 | static void devm_regulator_release(struct device *dev, void *res) |
1357 | { | |
1358 | regulator_put(*(struct regulator **)res); | |
1359 | } | |
1360 | ||
1361 | /** | |
1362 | * devm_regulator_get - Resource managed regulator_get() | |
1363 | * @dev: device for regulator "consumer" | |
1364 | * @id: Supply name or regulator ID. | |
1365 | * | |
1366 | * Managed regulator_get(). Regulators returned from this function are | |
1367 | * automatically regulator_put() on driver detach. See regulator_get() for more | |
1368 | * information. | |
1369 | */ | |
1370 | struct regulator *devm_regulator_get(struct device *dev, const char *id) | |
1371 | { | |
1372 | struct regulator **ptr, *regulator; | |
1373 | ||
1374 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1375 | if (!ptr) | |
1376 | return ERR_PTR(-ENOMEM); | |
1377 | ||
1378 | regulator = regulator_get(dev, id); | |
1379 | if (!IS_ERR(regulator)) { | |
1380 | *ptr = regulator; | |
1381 | devres_add(dev, ptr); | |
1382 | } else { | |
1383 | devres_free(ptr); | |
1384 | } | |
1385 | ||
1386 | return regulator; | |
1387 | } | |
1388 | EXPORT_SYMBOL_GPL(devm_regulator_get); | |
1389 | ||
5ffbd136 MB |
1390 | /** |
1391 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1392 | * @dev: device for regulator "consumer" | |
1393 | * @id: Supply name or regulator ID. | |
1394 | * | |
1395 | * Returns a struct regulator corresponding to the regulator producer, | |
1396 | * or IS_ERR() condition containing errno. Other consumers will be | |
1397 | * unable to obtain this reference is held and the use count for the | |
1398 | * regulator will be initialised to reflect the current state of the | |
1399 | * regulator. | |
1400 | * | |
1401 | * This is intended for use by consumers which cannot tolerate shared | |
1402 | * use of the regulator such as those which need to force the | |
1403 | * regulator off for correct operation of the hardware they are | |
1404 | * controlling. | |
1405 | * | |
1406 | * Use of supply names configured via regulator_set_device_supply() is | |
1407 | * strongly encouraged. It is recommended that the supply name used | |
1408 | * should match the name used for the supply and/or the relevant | |
1409 | * device pins in the datasheet. | |
1410 | */ | |
1411 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1412 | { | |
84fcf447 | 1413 | return _regulator_get(dev, id, true); |
5ffbd136 MB |
1414 | } |
1415 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1416 | ||
de1dd9fd MB |
1417 | /** |
1418 | * regulator_get_optional - obtain optional access to a regulator. | |
1419 | * @dev: device for regulator "consumer" | |
1420 | * @id: Supply name or regulator ID. | |
1421 | * | |
1422 | * Returns a struct regulator corresponding to the regulator producer, | |
1423 | * or IS_ERR() condition containing errno. Other consumers will be | |
1424 | * unable to obtain this reference is held and the use count for the | |
1425 | * regulator will be initialised to reflect the current state of the | |
1426 | * regulator. | |
1427 | * | |
1428 | * This is intended for use by consumers for devices which can have | |
1429 | * some supplies unconnected in normal use, such as some MMC devices. | |
1430 | * It can allow the regulator core to provide stub supplies for other | |
1431 | * supplies requested using normal regulator_get() calls without | |
1432 | * disrupting the operation of drivers that can handle absent | |
1433 | * supplies. | |
1434 | * | |
1435 | * Use of supply names configured via regulator_set_device_supply() is | |
1436 | * strongly encouraged. It is recommended that the supply name used | |
1437 | * should match the name used for the supply and/or the relevant | |
1438 | * device pins in the datasheet. | |
1439 | */ | |
1440 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1441 | { | |
1442 | return _regulator_get(dev, id, 0); | |
1443 | } | |
1444 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1445 | ||
1446 | /** | |
1447 | * devm_regulator_get_optional - Resource managed regulator_get_optional() | |
1448 | * @dev: device for regulator "consumer" | |
1449 | * @id: Supply name or regulator ID. | |
1450 | * | |
1451 | * Managed regulator_get_optional(). Regulators returned from this | |
1452 | * function are automatically regulator_put() on driver detach. See | |
1453 | * regulator_get_optional() for more information. | |
1454 | */ | |
1455 | struct regulator *devm_regulator_get_optional(struct device *dev, | |
1456 | const char *id) | |
1457 | { | |
1458 | struct regulator **ptr, *regulator; | |
1459 | ||
1460 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1461 | if (!ptr) | |
1462 | return ERR_PTR(-ENOMEM); | |
1463 | ||
1464 | regulator = regulator_get_optional(dev, id); | |
1465 | if (!IS_ERR(regulator)) { | |
1466 | *ptr = regulator; | |
1467 | devres_add(dev, ptr); | |
1468 | } else { | |
1469 | devres_free(ptr); | |
1470 | } | |
1471 | ||
1472 | return regulator; | |
1473 | } | |
1474 | EXPORT_SYMBOL_GPL(devm_regulator_get_optional); | |
1475 | ||
23ff2f0f CK |
1476 | /* Locks held by regulator_put() */ |
1477 | static void _regulator_put(struct regulator *regulator) | |
414c70cb LG |
1478 | { |
1479 | struct regulator_dev *rdev; | |
1480 | ||
1481 | if (regulator == NULL || IS_ERR(regulator)) | |
1482 | return; | |
1483 | ||
414c70cb LG |
1484 | rdev = regulator->rdev; |
1485 | ||
5de70519 | 1486 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1487 | |
414c70cb | 1488 | /* remove any sysfs entries */ |
e2c98eaf | 1489 | if (regulator->dev) |
414c70cb | 1490 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
5de70519 | 1491 | kfree(regulator->supply_name); |
414c70cb LG |
1492 | list_del(®ulator->list); |
1493 | kfree(regulator); | |
1494 | ||
5ffbd136 MB |
1495 | rdev->open_count--; |
1496 | rdev->exclusive = 0; | |
1497 | ||
414c70cb | 1498 | module_put(rdev->owner); |
23ff2f0f CK |
1499 | } |
1500 | ||
9efdd276 MK |
1501 | /** |
1502 | * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive() | |
1503 | * @dev: device for regulator "consumer" | |
1504 | * @id: Supply name or regulator ID. | |
1505 | * | |
1506 | * Managed regulator_get_exclusive(). Regulators returned from this function | |
1507 | * are automatically regulator_put() on driver detach. See regulator_get() for | |
1508 | * more information. | |
1509 | */ | |
1510 | struct regulator *devm_regulator_get_exclusive(struct device *dev, | |
1511 | const char *id) | |
1512 | { | |
1513 | struct regulator **ptr, *regulator; | |
1514 | ||
1515 | ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); | |
1516 | if (!ptr) | |
1517 | return ERR_PTR(-ENOMEM); | |
1518 | ||
1519 | regulator = _regulator_get(dev, id, 1); | |
1520 | if (!IS_ERR(regulator)) { | |
1521 | *ptr = regulator; | |
1522 | devres_add(dev, ptr); | |
1523 | } else { | |
1524 | devres_free(ptr); | |
1525 | } | |
1526 | ||
1527 | return regulator; | |
1528 | } | |
1529 | EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive); | |
1530 | ||
23ff2f0f CK |
1531 | /** |
1532 | * regulator_put - "free" the regulator source | |
1533 | * @regulator: regulator source | |
1534 | * | |
1535 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1536 | * regulator source are balanced by regulator_disable calls prior to calling | |
1537 | * this function. | |
1538 | */ | |
1539 | void regulator_put(struct regulator *regulator) | |
1540 | { | |
1541 | mutex_lock(®ulator_list_mutex); | |
1542 | _regulator_put(regulator); | |
414c70cb LG |
1543 | mutex_unlock(®ulator_list_mutex); |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(regulator_put); | |
1546 | ||
d5ad34f7 MB |
1547 | static int devm_regulator_match(struct device *dev, void *res, void *data) |
1548 | { | |
1549 | struct regulator **r = res; | |
1550 | if (!r || !*r) { | |
1551 | WARN_ON(!r || !*r); | |
1552 | return 0; | |
1553 | } | |
1554 | return *r == data; | |
1555 | } | |
1556 | ||
1557 | /** | |
1558 | * devm_regulator_put - Resource managed regulator_put() | |
1559 | * @regulator: regulator to free | |
1560 | * | |
1561 | * Deallocate a regulator allocated with devm_regulator_get(). Normally | |
1562 | * this function will not need to be called and the resource management | |
1563 | * code will ensure that the resource is freed. | |
1564 | */ | |
1565 | void devm_regulator_put(struct regulator *regulator) | |
1566 | { | |
1567 | int rc; | |
1568 | ||
361ff501 | 1569 | rc = devres_release(regulator->dev, devm_regulator_release, |
d5ad34f7 | 1570 | devm_regulator_match, regulator); |
230a5a1c | 1571 | if (rc != 0) |
968c2c17 | 1572 | WARN_ON(rc); |
d5ad34f7 MB |
1573 | } |
1574 | EXPORT_SYMBOL_GPL(devm_regulator_put); | |
1575 | ||
f19b00da KM |
1576 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1577 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1578 | const struct regulator_config *config) | |
1579 | { | |
1580 | struct regulator_enable_gpio *pin; | |
1581 | int ret; | |
1582 | ||
1583 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { | |
1584 | if (pin->gpio == config->ena_gpio) { | |
1585 | rdev_dbg(rdev, "GPIO %d is already used\n", | |
1586 | config->ena_gpio); | |
1587 | goto update_ena_gpio_to_rdev; | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | ret = gpio_request_one(config->ena_gpio, | |
1592 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1593 | rdev_get_name(rdev)); | |
1594 | if (ret) | |
1595 | return ret; | |
1596 | ||
1597 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1598 | if (pin == NULL) { | |
1599 | gpio_free(config->ena_gpio); | |
1600 | return -ENOMEM; | |
1601 | } | |
1602 | ||
1603 | pin->gpio = config->ena_gpio; | |
1604 | pin->ena_gpio_invert = config->ena_gpio_invert; | |
1605 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1606 | ||
1607 | update_ena_gpio_to_rdev: | |
1608 | pin->request_count++; | |
1609 | rdev->ena_pin = pin; | |
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1614 | { | |
1615 | struct regulator_enable_gpio *pin, *n; | |
1616 | ||
1617 | if (!rdev->ena_pin) | |
1618 | return; | |
1619 | ||
1620 | /* Free the GPIO only in case of no use */ | |
1621 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
1622 | if (pin->gpio == rdev->ena_pin->gpio) { | |
1623 | if (pin->request_count <= 1) { | |
1624 | pin->request_count = 0; | |
1625 | gpio_free(pin->gpio); | |
1626 | list_del(&pin->list); | |
1627 | kfree(pin); | |
1628 | } else { | |
1629 | pin->request_count--; | |
1630 | } | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | ||
967cfb18 | 1635 | /** |
31d6eebf RD |
1636 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1637 | * @rdev: regulator_dev structure | |
1638 | * @enable: enable GPIO at initial use? | |
1639 | * | |
967cfb18 KM |
1640 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1641 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1642 | */ | |
1643 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1644 | { | |
1645 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1646 | ||
1647 | if (!pin) | |
1648 | return -EINVAL; | |
1649 | ||
1650 | if (enable) { | |
1651 | /* Enable GPIO at initial use */ | |
1652 | if (pin->enable_count == 0) | |
1653 | gpio_set_value_cansleep(pin->gpio, | |
1654 | !pin->ena_gpio_invert); | |
1655 | ||
1656 | pin->enable_count++; | |
1657 | } else { | |
1658 | if (pin->enable_count > 1) { | |
1659 | pin->enable_count--; | |
1660 | return 0; | |
1661 | } | |
1662 | ||
1663 | /* Disable GPIO if not used */ | |
1664 | if (pin->enable_count <= 1) { | |
1665 | gpio_set_value_cansleep(pin->gpio, | |
1666 | pin->ena_gpio_invert); | |
1667 | pin->enable_count = 0; | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | return 0; | |
1672 | } | |
1673 | ||
5c5659d0 MB |
1674 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1675 | { | |
1676 | int ret, delay; | |
1677 | ||
1678 | /* Query before enabling in case configuration dependent. */ | |
1679 | ret = _regulator_get_enable_time(rdev); | |
1680 | if (ret >= 0) { | |
1681 | delay = ret; | |
1682 | } else { | |
1683 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1684 | delay = 0; | |
1685 | } | |
1686 | ||
1687 | trace_regulator_enable(rdev_get_name(rdev)); | |
1688 | ||
967cfb18 KM |
1689 | if (rdev->ena_pin) { |
1690 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1691 | if (ret < 0) | |
1692 | return ret; | |
65f73508 MB |
1693 | rdev->ena_gpio_state = 1; |
1694 | } else if (rdev->desc->ops->enable) { | |
5c5659d0 MB |
1695 | ret = rdev->desc->ops->enable(rdev); |
1696 | if (ret < 0) | |
1697 | return ret; | |
1698 | } else { | |
1699 | return -EINVAL; | |
1700 | } | |
1701 | ||
1702 | /* Allow the regulator to ramp; it would be useful to extend | |
1703 | * this for bulk operations so that the regulators can ramp | |
1704 | * together. */ | |
1705 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1706 | ||
1707 | if (delay >= 1000) { | |
1708 | mdelay(delay / 1000); | |
1709 | udelay(delay % 1000); | |
1710 | } else if (delay) { | |
1711 | udelay(delay); | |
1712 | } | |
1713 | ||
1714 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
414c70cb LG |
1719 | /* locks held by regulator_enable() */ |
1720 | static int _regulator_enable(struct regulator_dev *rdev) | |
1721 | { | |
5c5659d0 | 1722 | int ret; |
414c70cb | 1723 | |
414c70cb | 1724 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
1725 | if (rdev->constraints && |
1726 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
1727 | drms_uA_update(rdev); | |
414c70cb | 1728 | |
9a2372fa MB |
1729 | if (rdev->use_count == 0) { |
1730 | /* The regulator may on if it's not switchable or left on */ | |
1731 | ret = _regulator_is_enabled(rdev); | |
1732 | if (ret == -EINVAL || ret == 0) { | |
1733 | if (!_regulator_can_change_status(rdev)) | |
1734 | return -EPERM; | |
1735 | ||
5c5659d0 | 1736 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
1737 | if (ret < 0) |
1738 | return ret; | |
1739 | ||
a7433cff | 1740 | } else if (ret < 0) { |
5da84fd9 | 1741 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
1742 | return ret; |
1743 | } | |
a7433cff | 1744 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
1745 | } |
1746 | ||
9a2372fa MB |
1747 | rdev->use_count++; |
1748 | ||
1749 | return 0; | |
414c70cb LG |
1750 | } |
1751 | ||
1752 | /** | |
1753 | * regulator_enable - enable regulator output | |
1754 | * @regulator: regulator source | |
1755 | * | |
cf7bbcdf MB |
1756 | * Request that the regulator be enabled with the regulator output at |
1757 | * the predefined voltage or current value. Calls to regulator_enable() | |
1758 | * must be balanced with calls to regulator_disable(). | |
1759 | * | |
414c70cb | 1760 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 1761 | * hardwired in the regulator. |
414c70cb LG |
1762 | */ |
1763 | int regulator_enable(struct regulator *regulator) | |
1764 | { | |
412aec61 DB |
1765 | struct regulator_dev *rdev = regulator->rdev; |
1766 | int ret = 0; | |
414c70cb | 1767 | |
6492bc1b MB |
1768 | if (regulator->always_on) |
1769 | return 0; | |
1770 | ||
3801b86a MB |
1771 | if (rdev->supply) { |
1772 | ret = regulator_enable(rdev->supply); | |
1773 | if (ret != 0) | |
1774 | return ret; | |
1775 | } | |
1776 | ||
412aec61 | 1777 | mutex_lock(&rdev->mutex); |
cd94b505 | 1778 | ret = _regulator_enable(rdev); |
412aec61 | 1779 | mutex_unlock(&rdev->mutex); |
3801b86a | 1780 | |
d1685e4e | 1781 | if (ret != 0 && rdev->supply) |
3801b86a MB |
1782 | regulator_disable(rdev->supply); |
1783 | ||
414c70cb LG |
1784 | return ret; |
1785 | } | |
1786 | EXPORT_SYMBOL_GPL(regulator_enable); | |
1787 | ||
5c5659d0 MB |
1788 | static int _regulator_do_disable(struct regulator_dev *rdev) |
1789 | { | |
1790 | int ret; | |
1791 | ||
1792 | trace_regulator_disable(rdev_get_name(rdev)); | |
1793 | ||
967cfb18 KM |
1794 | if (rdev->ena_pin) { |
1795 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
1796 | if (ret < 0) | |
1797 | return ret; | |
5c5659d0 MB |
1798 | rdev->ena_gpio_state = 0; |
1799 | ||
1800 | } else if (rdev->desc->ops->disable) { | |
1801 | ret = rdev->desc->ops->disable(rdev); | |
1802 | if (ret != 0) | |
1803 | return ret; | |
1804 | } | |
1805 | ||
1806 | trace_regulator_disable_complete(rdev_get_name(rdev)); | |
1807 | ||
1808 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, | |
1809 | NULL); | |
1810 | return 0; | |
1811 | } | |
1812 | ||
414c70cb | 1813 | /* locks held by regulator_disable() */ |
3801b86a | 1814 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
1815 | { |
1816 | int ret = 0; | |
1817 | ||
cd94b505 | 1818 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 1819 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
1820 | return -EIO; |
1821 | ||
414c70cb | 1822 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
1823 | if (rdev->use_count == 1 && |
1824 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
1825 | |
1826 | /* we are last user */ | |
5c5659d0 MB |
1827 | if (_regulator_can_change_status(rdev)) { |
1828 | ret = _regulator_do_disable(rdev); | |
414c70cb | 1829 | if (ret < 0) { |
5da84fd9 | 1830 | rdev_err(rdev, "failed to disable\n"); |
414c70cb LG |
1831 | return ret; |
1832 | } | |
1833 | } | |
1834 | ||
414c70cb LG |
1835 | rdev->use_count = 0; |
1836 | } else if (rdev->use_count > 1) { | |
1837 | ||
1838 | if (rdev->constraints && | |
1839 | (rdev->constraints->valid_ops_mask & | |
1840 | REGULATOR_CHANGE_DRMS)) | |
1841 | drms_uA_update(rdev); | |
1842 | ||
1843 | rdev->use_count--; | |
1844 | } | |
3801b86a | 1845 | |
414c70cb LG |
1846 | return ret; |
1847 | } | |
1848 | ||
1849 | /** | |
1850 | * regulator_disable - disable regulator output | |
1851 | * @regulator: regulator source | |
1852 | * | |
cf7bbcdf MB |
1853 | * Disable the regulator output voltage or current. Calls to |
1854 | * regulator_enable() must be balanced with calls to | |
1855 | * regulator_disable(). | |
69279fb9 | 1856 | * |
414c70cb | 1857 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
1858 | * devices have it enabled, the regulator device supports disabling and |
1859 | * machine constraints permit this operation. | |
414c70cb LG |
1860 | */ |
1861 | int regulator_disable(struct regulator *regulator) | |
1862 | { | |
412aec61 DB |
1863 | struct regulator_dev *rdev = regulator->rdev; |
1864 | int ret = 0; | |
414c70cb | 1865 | |
6492bc1b MB |
1866 | if (regulator->always_on) |
1867 | return 0; | |
1868 | ||
412aec61 | 1869 | mutex_lock(&rdev->mutex); |
3801b86a | 1870 | ret = _regulator_disable(rdev); |
412aec61 | 1871 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1872 | |
3801b86a MB |
1873 | if (ret == 0 && rdev->supply) |
1874 | regulator_disable(rdev->supply); | |
8cbf811d | 1875 | |
414c70cb LG |
1876 | return ret; |
1877 | } | |
1878 | EXPORT_SYMBOL_GPL(regulator_disable); | |
1879 | ||
1880 | /* locks held by regulator_force_disable() */ | |
3801b86a | 1881 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
1882 | { |
1883 | int ret = 0; | |
1884 | ||
1885 | /* force disable */ | |
1886 | if (rdev->desc->ops->disable) { | |
1887 | /* ah well, who wants to live forever... */ | |
1888 | ret = rdev->desc->ops->disable(rdev); | |
1889 | if (ret < 0) { | |
5da84fd9 | 1890 | rdev_err(rdev, "failed to force disable\n"); |
414c70cb LG |
1891 | return ret; |
1892 | } | |
1893 | /* notify other consumers that power has been forced off */ | |
84b68263 MB |
1894 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
1895 | REGULATOR_EVENT_DISABLE, NULL); | |
414c70cb LG |
1896 | } |
1897 | ||
414c70cb LG |
1898 | return ret; |
1899 | } | |
1900 | ||
1901 | /** | |
1902 | * regulator_force_disable - force disable regulator output | |
1903 | * @regulator: regulator source | |
1904 | * | |
1905 | * Forcibly disable the regulator output voltage or current. | |
1906 | * NOTE: this *will* disable the regulator output even if other consumer | |
1907 | * devices have it enabled. This should be used for situations when device | |
1908 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
1909 | */ | |
1910 | int regulator_force_disable(struct regulator *regulator) | |
1911 | { | |
82d15839 | 1912 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
1913 | int ret; |
1914 | ||
82d15839 | 1915 | mutex_lock(&rdev->mutex); |
414c70cb | 1916 | regulator->uA_load = 0; |
3801b86a | 1917 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 1918 | mutex_unlock(&rdev->mutex); |
8cbf811d | 1919 | |
3801b86a MB |
1920 | if (rdev->supply) |
1921 | while (rdev->open_count--) | |
1922 | regulator_disable(rdev->supply); | |
8cbf811d | 1923 | |
414c70cb LG |
1924 | return ret; |
1925 | } | |
1926 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
1927 | ||
da07ecd9 MB |
1928 | static void regulator_disable_work(struct work_struct *work) |
1929 | { | |
1930 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
1931 | disable_work.work); | |
1932 | int count, i, ret; | |
1933 | ||
1934 | mutex_lock(&rdev->mutex); | |
1935 | ||
1936 | BUG_ON(!rdev->deferred_disables); | |
1937 | ||
1938 | count = rdev->deferred_disables; | |
1939 | rdev->deferred_disables = 0; | |
1940 | ||
1941 | for (i = 0; i < count; i++) { | |
1942 | ret = _regulator_disable(rdev); | |
1943 | if (ret != 0) | |
1944 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
1945 | } | |
1946 | ||
1947 | mutex_unlock(&rdev->mutex); | |
1948 | ||
1949 | if (rdev->supply) { | |
1950 | for (i = 0; i < count; i++) { | |
1951 | ret = regulator_disable(rdev->supply); | |
1952 | if (ret != 0) { | |
1953 | rdev_err(rdev, | |
1954 | "Supply disable failed: %d\n", ret); | |
1955 | } | |
1956 | } | |
1957 | } | |
1958 | } | |
1959 | ||
1960 | /** | |
1961 | * regulator_disable_deferred - disable regulator output with delay | |
1962 | * @regulator: regulator source | |
1963 | * @ms: miliseconds until the regulator is disabled | |
1964 | * | |
1965 | * Execute regulator_disable() on the regulator after a delay. This | |
1966 | * is intended for use with devices that require some time to quiesce. | |
1967 | * | |
1968 | * NOTE: this will only disable the regulator output if no other consumer | |
1969 | * devices have it enabled, the regulator device supports disabling and | |
1970 | * machine constraints permit this operation. | |
1971 | */ | |
1972 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
1973 | { | |
1974 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 1975 | int ret; |
da07ecd9 | 1976 | |
6492bc1b MB |
1977 | if (regulator->always_on) |
1978 | return 0; | |
1979 | ||
2b5a24a0 MB |
1980 | if (!ms) |
1981 | return regulator_disable(regulator); | |
1982 | ||
da07ecd9 MB |
1983 | mutex_lock(&rdev->mutex); |
1984 | rdev->deferred_disables++; | |
1985 | mutex_unlock(&rdev->mutex); | |
1986 | ||
070260f0 MB |
1987 | ret = queue_delayed_work(system_power_efficient_wq, |
1988 | &rdev->disable_work, | |
1989 | msecs_to_jiffies(ms)); | |
aa59802d MB |
1990 | if (ret < 0) |
1991 | return ret; | |
1992 | else | |
1993 | return 0; | |
da07ecd9 MB |
1994 | } |
1995 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
1996 | ||
414c70cb LG |
1997 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
1998 | { | |
65f73508 | 1999 | /* A GPIO control always takes precedence */ |
7b74d149 | 2000 | if (rdev->ena_pin) |
65f73508 MB |
2001 | return rdev->ena_gpio_state; |
2002 | ||
9a7f6a4c | 2003 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2004 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2005 | return 1; |
414c70cb | 2006 | |
9332546f | 2007 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2008 | } |
2009 | ||
2010 | /** | |
2011 | * regulator_is_enabled - is the regulator output enabled | |
2012 | * @regulator: regulator source | |
2013 | * | |
412aec61 DB |
2014 | * Returns positive if the regulator driver backing the source/client |
2015 | * has requested that the device be enabled, zero if it hasn't, else a | |
2016 | * negative errno code. | |
2017 | * | |
2018 | * Note that the device backing this regulator handle can have multiple | |
2019 | * users, so it might be enabled even if regulator_enable() was never | |
2020 | * called for this particular source. | |
414c70cb LG |
2021 | */ |
2022 | int regulator_is_enabled(struct regulator *regulator) | |
2023 | { | |
9332546f MB |
2024 | int ret; |
2025 | ||
6492bc1b MB |
2026 | if (regulator->always_on) |
2027 | return 1; | |
2028 | ||
9332546f MB |
2029 | mutex_lock(®ulator->rdev->mutex); |
2030 | ret = _regulator_is_enabled(regulator->rdev); | |
2031 | mutex_unlock(®ulator->rdev->mutex); | |
2032 | ||
2033 | return ret; | |
414c70cb LG |
2034 | } |
2035 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2036 | ||
d1e7de30 MS |
2037 | /** |
2038 | * regulator_can_change_voltage - check if regulator can change voltage | |
2039 | * @regulator: regulator source | |
2040 | * | |
2041 | * Returns positive if the regulator driver backing the source/client | |
2042 | * can change its voltage, false otherwise. Usefull for detecting fixed | |
2043 | * or dummy regulators and disabling voltage change logic in the client | |
2044 | * driver. | |
2045 | */ | |
2046 | int regulator_can_change_voltage(struct regulator *regulator) | |
2047 | { | |
2048 | struct regulator_dev *rdev = regulator->rdev; | |
2049 | ||
2050 | if (rdev->constraints && | |
19280e40 AL |
2051 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2052 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2053 | return 1; | |
2054 | ||
2055 | if (rdev->desc->continuous_voltage_range && | |
2056 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2057 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2058 | return 1; | |
2059 | } | |
d1e7de30 MS |
2060 | |
2061 | return 0; | |
2062 | } | |
2063 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2064 | ||
4367cfdc DB |
2065 | /** |
2066 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2067 | * @regulator: regulator source | |
2068 | * | |
2069 | * Returns number of selectors, or negative errno. Selectors are | |
2070 | * numbered starting at zero, and typically correspond to bitfields | |
2071 | * in hardware registers. | |
2072 | */ | |
2073 | int regulator_count_voltages(struct regulator *regulator) | |
2074 | { | |
2075 | struct regulator_dev *rdev = regulator->rdev; | |
2076 | ||
2077 | return rdev->desc->n_voltages ? : -EINVAL; | |
2078 | } | |
2079 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2080 | ||
2081 | /** | |
2082 | * regulator_list_voltage - enumerate supported voltages | |
2083 | * @regulator: regulator source | |
2084 | * @selector: identify voltage to list | |
2085 | * Context: can sleep | |
2086 | * | |
2087 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2088 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2089 | * negative errno. |
2090 | */ | |
2091 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2092 | { | |
2093 | struct regulator_dev *rdev = regulator->rdev; | |
2094 | struct regulator_ops *ops = rdev->desc->ops; | |
2095 | int ret; | |
2096 | ||
2097 | if (!ops->list_voltage || selector >= rdev->desc->n_voltages) | |
2098 | return -EINVAL; | |
2099 | ||
2100 | mutex_lock(&rdev->mutex); | |
2101 | ret = ops->list_voltage(rdev, selector); | |
2102 | mutex_unlock(&rdev->mutex); | |
2103 | ||
2104 | if (ret > 0) { | |
2105 | if (ret < rdev->constraints->min_uV) | |
2106 | ret = 0; | |
2107 | else if (ret > rdev->constraints->max_uV) | |
2108 | ret = 0; | |
2109 | } | |
2110 | ||
2111 | return ret; | |
2112 | } | |
2113 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2114 | ||
2a668a8b PW |
2115 | /** |
2116 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2117 | * @regulator: regulator source | |
2118 | * | |
2119 | * Returns the voltage step size between VSEL values for linear | |
2120 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2121 | */ | |
2122 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2123 | { | |
2124 | struct regulator_dev *rdev = regulator->rdev; | |
2125 | ||
2126 | return rdev->desc->uV_step; | |
2127 | } | |
2128 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2129 | ||
a7a1ad90 MB |
2130 | /** |
2131 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2132 | * | |
2133 | * @regulator: Regulator to check. | |
2134 | * @min_uV: Minimum required voltage in uV. | |
2135 | * @max_uV: Maximum required voltage in uV. | |
2136 | * | |
2137 | * Returns a boolean or a negative error code. | |
2138 | */ | |
2139 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2140 | int min_uV, int max_uV) | |
2141 | { | |
c5f3939b | 2142 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2143 | int i, voltages, ret; |
2144 | ||
c5f3939b MB |
2145 | /* If we can't change voltage check the current voltage */ |
2146 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2147 | ret = regulator_get_voltage(regulator); | |
2148 | if (ret >= 0) | |
f0f98b19 | 2149 | return (min_uV <= ret && ret <= max_uV); |
c5f3939b MB |
2150 | else |
2151 | return ret; | |
2152 | } | |
2153 | ||
bd7a2b60 PM |
2154 | /* Any voltage within constrains range is fine? */ |
2155 | if (rdev->desc->continuous_voltage_range) | |
2156 | return min_uV >= rdev->constraints->min_uV && | |
2157 | max_uV <= rdev->constraints->max_uV; | |
2158 | ||
a7a1ad90 MB |
2159 | ret = regulator_count_voltages(regulator); |
2160 | if (ret < 0) | |
2161 | return ret; | |
2162 | voltages = ret; | |
2163 | ||
2164 | for (i = 0; i < voltages; i++) { | |
2165 | ret = regulator_list_voltage(regulator, i); | |
2166 | ||
2167 | if (ret >= min_uV && ret <= max_uV) | |
2168 | return 1; | |
2169 | } | |
2170 | ||
2171 | return 0; | |
2172 | } | |
a398eaa2 | 2173 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2174 | |
75790251 MB |
2175 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2176 | int min_uV, int max_uV) | |
2177 | { | |
2178 | int ret; | |
77af1b26 | 2179 | int delay = 0; |
e113d792 | 2180 | int best_val = 0; |
75790251 | 2181 | unsigned int selector; |
eba41a5e | 2182 | int old_selector = -1; |
75790251 MB |
2183 | |
2184 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2185 | ||
bf5892a8 MB |
2186 | min_uV += rdev->constraints->uV_offset; |
2187 | max_uV += rdev->constraints->uV_offset; | |
2188 | ||
eba41a5e AL |
2189 | /* |
2190 | * If we can't obtain the old selector there is not enough | |
2191 | * info to call set_voltage_time_sel(). | |
2192 | */ | |
8b7485ef AL |
2193 | if (_regulator_is_enabled(rdev) && |
2194 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2195 | rdev->desc->ops->get_voltage_sel) { |
2196 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2197 | if (old_selector < 0) | |
2198 | return old_selector; | |
2199 | } | |
2200 | ||
75790251 MB |
2201 | if (rdev->desc->ops->set_voltage) { |
2202 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, | |
2203 | &selector); | |
e113d792 MB |
2204 | |
2205 | if (ret >= 0) { | |
2206 | if (rdev->desc->ops->list_voltage) | |
2207 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2208 | selector); | |
2209 | else | |
2210 | best_val = _regulator_get_voltage(rdev); | |
2211 | } | |
2212 | ||
e8eef82b | 2213 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2214 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2215 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2216 | max_uV); | |
9152c36a AL |
2217 | } else { |
2218 | if (rdev->desc->ops->list_voltage == | |
2219 | regulator_list_voltage_linear) | |
2220 | ret = regulator_map_voltage_linear(rdev, | |
2221 | min_uV, max_uV); | |
2222 | else | |
2223 | ret = regulator_map_voltage_iterate(rdev, | |
2224 | min_uV, max_uV); | |
2225 | } | |
e8eef82b | 2226 | |
e843fc46 | 2227 | if (ret >= 0) { |
e113d792 MB |
2228 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2229 | if (min_uV <= best_val && max_uV >= best_val) { | |
2230 | selector = ret; | |
c66a566a AL |
2231 | if (old_selector == selector) |
2232 | ret = 0; | |
2233 | else | |
2234 | ret = rdev->desc->ops->set_voltage_sel( | |
2235 | rdev, ret); | |
e113d792 MB |
2236 | } else { |
2237 | ret = -EINVAL; | |
2238 | } | |
e8eef82b | 2239 | } |
75790251 MB |
2240 | } else { |
2241 | ret = -EINVAL; | |
2242 | } | |
e8eef82b | 2243 | |
eba41a5e | 2244 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2245 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2246 | && old_selector != selector) { | |
77af1b26 | 2247 | |
eba41a5e AL |
2248 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2249 | old_selector, selector); | |
2250 | if (delay < 0) { | |
2251 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2252 | delay); | |
2253 | delay = 0; | |
e8eef82b | 2254 | } |
75790251 | 2255 | |
8b96de31 PR |
2256 | /* Insert any necessary delays */ |
2257 | if (delay >= 1000) { | |
2258 | mdelay(delay / 1000); | |
2259 | udelay(delay % 1000); | |
2260 | } else if (delay) { | |
2261 | udelay(delay); | |
2262 | } | |
77af1b26 LW |
2263 | } |
2264 | ||
2f6c797f AL |
2265 | if (ret == 0 && best_val >= 0) { |
2266 | unsigned long data = best_val; | |
2267 | ||
ded06a52 | 2268 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2269 | (void *)data); |
2270 | } | |
ded06a52 | 2271 | |
eba41a5e | 2272 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2273 | |
2274 | return ret; | |
2275 | } | |
2276 | ||
414c70cb LG |
2277 | /** |
2278 | * regulator_set_voltage - set regulator output voltage | |
2279 | * @regulator: regulator source | |
2280 | * @min_uV: Minimum required voltage in uV | |
2281 | * @max_uV: Maximum acceptable voltage in uV | |
2282 | * | |
2283 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2284 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2285 | * | |
2286 | * If the regulator is enabled then the voltage will change to the new value | |
2287 | * immediately otherwise if the regulator is disabled the regulator will | |
2288 | * output at the new voltage when enabled. | |
2289 | * | |
2290 | * NOTE: If the regulator is shared between several devices then the lowest | |
2291 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2292 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2293 | * calling this function otherwise this call will fail. |
2294 | */ | |
2295 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2296 | { | |
2297 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2298 | int ret = 0; |
92d7a558 | 2299 | int old_min_uV, old_max_uV; |
414c70cb LG |
2300 | |
2301 | mutex_lock(&rdev->mutex); | |
2302 | ||
95a3c23a MB |
2303 | /* If we're setting the same range as last time the change |
2304 | * should be a noop (some cpufreq implementations use the same | |
2305 | * voltage for multiple frequencies, for example). | |
2306 | */ | |
2307 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2308 | goto out; | |
2309 | ||
414c70cb | 2310 | /* sanity check */ |
e8eef82b MB |
2311 | if (!rdev->desc->ops->set_voltage && |
2312 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2313 | ret = -EINVAL; |
2314 | goto out; | |
2315 | } | |
2316 | ||
2317 | /* constraints check */ | |
2318 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2319 | if (ret < 0) | |
2320 | goto out; | |
92d7a558 PP |
2321 | |
2322 | /* restore original values in case of error */ | |
2323 | old_min_uV = regulator->min_uV; | |
2324 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2325 | regulator->min_uV = min_uV; |
2326 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2327 | |
05fda3b1 TP |
2328 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2329 | if (ret < 0) | |
92d7a558 | 2330 | goto out2; |
05fda3b1 | 2331 | |
75790251 | 2332 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2333 | if (ret < 0) |
2334 | goto out2; | |
2335 | ||
414c70cb LG |
2336 | out: |
2337 | mutex_unlock(&rdev->mutex); | |
2338 | return ret; | |
92d7a558 PP |
2339 | out2: |
2340 | regulator->min_uV = old_min_uV; | |
2341 | regulator->max_uV = old_max_uV; | |
2342 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2343 | return ret; |
2344 | } | |
2345 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2346 | ||
88cd222b LW |
2347 | /** |
2348 | * regulator_set_voltage_time - get raise/fall time | |
2349 | * @regulator: regulator source | |
2350 | * @old_uV: starting voltage in microvolts | |
2351 | * @new_uV: target voltage in microvolts | |
2352 | * | |
2353 | * Provided with the starting and ending voltage, this function attempts to | |
2354 | * calculate the time in microseconds required to rise or fall to this new | |
2355 | * voltage. | |
2356 | */ | |
2357 | int regulator_set_voltage_time(struct regulator *regulator, | |
2358 | int old_uV, int new_uV) | |
2359 | { | |
2360 | struct regulator_dev *rdev = regulator->rdev; | |
2361 | struct regulator_ops *ops = rdev->desc->ops; | |
2362 | int old_sel = -1; | |
2363 | int new_sel = -1; | |
2364 | int voltage; | |
2365 | int i; | |
2366 | ||
2367 | /* Currently requires operations to do this */ | |
2368 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2369 | || !rdev->desc->n_voltages) | |
2370 | return -EINVAL; | |
2371 | ||
2372 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2373 | /* We only look for exact voltage matches here */ | |
2374 | voltage = regulator_list_voltage(regulator, i); | |
2375 | if (voltage < 0) | |
2376 | return -EINVAL; | |
2377 | if (voltage == 0) | |
2378 | continue; | |
2379 | if (voltage == old_uV) | |
2380 | old_sel = i; | |
2381 | if (voltage == new_uV) | |
2382 | new_sel = i; | |
2383 | } | |
2384 | ||
2385 | if (old_sel < 0 || new_sel < 0) | |
2386 | return -EINVAL; | |
2387 | ||
2388 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2389 | } | |
2390 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2391 | ||
98a175b6 | 2392 | /** |
296c6566 RD |
2393 | * regulator_set_voltage_time_sel - get raise/fall time |
2394 | * @rdev: regulator source device | |
98a175b6 YSB |
2395 | * @old_selector: selector for starting voltage |
2396 | * @new_selector: selector for target voltage | |
2397 | * | |
2398 | * Provided with the starting and target voltage selectors, this function | |
2399 | * returns time in microseconds required to rise or fall to this new voltage | |
2400 | * | |
f11d08c3 | 2401 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2402 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2403 | */ |
2404 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2405 | unsigned int old_selector, | |
2406 | unsigned int new_selector) | |
2407 | { | |
398715ab | 2408 | unsigned int ramp_delay = 0; |
f11d08c3 | 2409 | int old_volt, new_volt; |
398715ab AL |
2410 | |
2411 | if (rdev->constraints->ramp_delay) | |
2412 | ramp_delay = rdev->constraints->ramp_delay; | |
2413 | else if (rdev->desc->ramp_delay) | |
2414 | ramp_delay = rdev->desc->ramp_delay; | |
2415 | ||
2416 | if (ramp_delay == 0) { | |
6f0b2c69 | 2417 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2418 | return 0; |
6f0b2c69 | 2419 | } |
398715ab | 2420 | |
f11d08c3 AL |
2421 | /* sanity check */ |
2422 | if (!rdev->desc->ops->list_voltage) | |
2423 | return -EINVAL; | |
398715ab | 2424 | |
f11d08c3 AL |
2425 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2426 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2427 | ||
2428 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2429 | } |
b19dbf71 | 2430 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2431 | |
606a2562 MB |
2432 | /** |
2433 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2434 | * @regulator: regulator source | |
2435 | * | |
2436 | * Re-apply the last configured voltage. This is intended to be used | |
2437 | * where some external control source the consumer is cooperating with | |
2438 | * has caused the configured voltage to change. | |
2439 | */ | |
2440 | int regulator_sync_voltage(struct regulator *regulator) | |
2441 | { | |
2442 | struct regulator_dev *rdev = regulator->rdev; | |
2443 | int ret, min_uV, max_uV; | |
2444 | ||
2445 | mutex_lock(&rdev->mutex); | |
2446 | ||
2447 | if (!rdev->desc->ops->set_voltage && | |
2448 | !rdev->desc->ops->set_voltage_sel) { | |
2449 | ret = -EINVAL; | |
2450 | goto out; | |
2451 | } | |
2452 | ||
2453 | /* This is only going to work if we've had a voltage configured. */ | |
2454 | if (!regulator->min_uV && !regulator->max_uV) { | |
2455 | ret = -EINVAL; | |
2456 | goto out; | |
2457 | } | |
2458 | ||
2459 | min_uV = regulator->min_uV; | |
2460 | max_uV = regulator->max_uV; | |
2461 | ||
2462 | /* This should be a paranoia check... */ | |
2463 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2464 | if (ret < 0) | |
2465 | goto out; | |
2466 | ||
2467 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2468 | if (ret < 0) | |
2469 | goto out; | |
2470 | ||
2471 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2472 | ||
2473 | out: | |
2474 | mutex_unlock(&rdev->mutex); | |
2475 | return ret; | |
2476 | } | |
2477 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2478 | ||
414c70cb LG |
2479 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2480 | { | |
bf5892a8 | 2481 | int sel, ret; |
476c2d83 MB |
2482 | |
2483 | if (rdev->desc->ops->get_voltage_sel) { | |
2484 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2485 | if (sel < 0) | |
2486 | return sel; | |
bf5892a8 | 2487 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2488 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2489 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2490 | } else if (rdev->desc->ops->list_voltage) { |
2491 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
cb220d16 | 2492 | } else { |
414c70cb | 2493 | return -EINVAL; |
cb220d16 | 2494 | } |
bf5892a8 | 2495 | |
cb220d16 AL |
2496 | if (ret < 0) |
2497 | return ret; | |
bf5892a8 | 2498 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2499 | } |
2500 | ||
2501 | /** | |
2502 | * regulator_get_voltage - get regulator output voltage | |
2503 | * @regulator: regulator source | |
2504 | * | |
2505 | * This returns the current regulator voltage in uV. | |
2506 | * | |
2507 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2508 | * function should not be used to determine regulator state. | |
2509 | */ | |
2510 | int regulator_get_voltage(struct regulator *regulator) | |
2511 | { | |
2512 | int ret; | |
2513 | ||
2514 | mutex_lock(®ulator->rdev->mutex); | |
2515 | ||
2516 | ret = _regulator_get_voltage(regulator->rdev); | |
2517 | ||
2518 | mutex_unlock(®ulator->rdev->mutex); | |
2519 | ||
2520 | return ret; | |
2521 | } | |
2522 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2523 | ||
2524 | /** | |
2525 | * regulator_set_current_limit - set regulator output current limit | |
2526 | * @regulator: regulator source | |
ce0d10f8 | 2527 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2528 | * @max_uA: Maximum supported current in uA |
2529 | * | |
2530 | * Sets current sink to the desired output current. This can be set during | |
2531 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2532 | * | |
2533 | * If the regulator is enabled then the current will change to the new value | |
2534 | * immediately otherwise if the regulator is disabled the regulator will | |
2535 | * output at the new current when enabled. | |
2536 | * | |
2537 | * NOTE: Regulator system constraints must be set for this regulator before | |
2538 | * calling this function otherwise this call will fail. | |
2539 | */ | |
2540 | int regulator_set_current_limit(struct regulator *regulator, | |
2541 | int min_uA, int max_uA) | |
2542 | { | |
2543 | struct regulator_dev *rdev = regulator->rdev; | |
2544 | int ret; | |
2545 | ||
2546 | mutex_lock(&rdev->mutex); | |
2547 | ||
2548 | /* sanity check */ | |
2549 | if (!rdev->desc->ops->set_current_limit) { | |
2550 | ret = -EINVAL; | |
2551 | goto out; | |
2552 | } | |
2553 | ||
2554 | /* constraints check */ | |
2555 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
2556 | if (ret < 0) | |
2557 | goto out; | |
2558 | ||
2559 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
2560 | out: | |
2561 | mutex_unlock(&rdev->mutex); | |
2562 | return ret; | |
2563 | } | |
2564 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
2565 | ||
2566 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
2567 | { | |
2568 | int ret; | |
2569 | ||
2570 | mutex_lock(&rdev->mutex); | |
2571 | ||
2572 | /* sanity check */ | |
2573 | if (!rdev->desc->ops->get_current_limit) { | |
2574 | ret = -EINVAL; | |
2575 | goto out; | |
2576 | } | |
2577 | ||
2578 | ret = rdev->desc->ops->get_current_limit(rdev); | |
2579 | out: | |
2580 | mutex_unlock(&rdev->mutex); | |
2581 | return ret; | |
2582 | } | |
2583 | ||
2584 | /** | |
2585 | * regulator_get_current_limit - get regulator output current | |
2586 | * @regulator: regulator source | |
2587 | * | |
2588 | * This returns the current supplied by the specified current sink in uA. | |
2589 | * | |
2590 | * NOTE: If the regulator is disabled it will return the current value. This | |
2591 | * function should not be used to determine regulator state. | |
2592 | */ | |
2593 | int regulator_get_current_limit(struct regulator *regulator) | |
2594 | { | |
2595 | return _regulator_get_current_limit(regulator->rdev); | |
2596 | } | |
2597 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
2598 | ||
2599 | /** | |
2600 | * regulator_set_mode - set regulator operating mode | |
2601 | * @regulator: regulator source | |
2602 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
2603 | * | |
2604 | * Set regulator operating mode to increase regulator efficiency or improve | |
2605 | * regulation performance. | |
2606 | * | |
2607 | * NOTE: Regulator system constraints must be set for this regulator before | |
2608 | * calling this function otherwise this call will fail. | |
2609 | */ | |
2610 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
2611 | { | |
2612 | struct regulator_dev *rdev = regulator->rdev; | |
2613 | int ret; | |
500b4ac9 | 2614 | int regulator_curr_mode; |
414c70cb LG |
2615 | |
2616 | mutex_lock(&rdev->mutex); | |
2617 | ||
2618 | /* sanity check */ | |
2619 | if (!rdev->desc->ops->set_mode) { | |
2620 | ret = -EINVAL; | |
2621 | goto out; | |
2622 | } | |
2623 | ||
500b4ac9 SI |
2624 | /* return if the same mode is requested */ |
2625 | if (rdev->desc->ops->get_mode) { | |
2626 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
2627 | if (regulator_curr_mode == mode) { | |
2628 | ret = 0; | |
2629 | goto out; | |
2630 | } | |
2631 | } | |
2632 | ||
414c70cb | 2633 | /* constraints check */ |
22c51b47 | 2634 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
2635 | if (ret < 0) |
2636 | goto out; | |
2637 | ||
2638 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
2639 | out: | |
2640 | mutex_unlock(&rdev->mutex); | |
2641 | return ret; | |
2642 | } | |
2643 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
2644 | ||
2645 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
2646 | { | |
2647 | int ret; | |
2648 | ||
2649 | mutex_lock(&rdev->mutex); | |
2650 | ||
2651 | /* sanity check */ | |
2652 | if (!rdev->desc->ops->get_mode) { | |
2653 | ret = -EINVAL; | |
2654 | goto out; | |
2655 | } | |
2656 | ||
2657 | ret = rdev->desc->ops->get_mode(rdev); | |
2658 | out: | |
2659 | mutex_unlock(&rdev->mutex); | |
2660 | return ret; | |
2661 | } | |
2662 | ||
2663 | /** | |
2664 | * regulator_get_mode - get regulator operating mode | |
2665 | * @regulator: regulator source | |
2666 | * | |
2667 | * Get the current regulator operating mode. | |
2668 | */ | |
2669 | unsigned int regulator_get_mode(struct regulator *regulator) | |
2670 | { | |
2671 | return _regulator_get_mode(regulator->rdev); | |
2672 | } | |
2673 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
2674 | ||
2675 | /** | |
2676 | * regulator_set_optimum_mode - set regulator optimum operating mode | |
2677 | * @regulator: regulator source | |
2678 | * @uA_load: load current | |
2679 | * | |
2680 | * Notifies the regulator core of a new device load. This is then used by | |
2681 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
2682 | * operating mode for the new regulator loading. | |
2683 | * | |
2684 | * Consumer devices notify their supply regulator of the maximum power | |
2685 | * they will require (can be taken from device datasheet in the power | |
2686 | * consumption tables) when they change operational status and hence power | |
2687 | * state. Examples of operational state changes that can affect power | |
2688 | * consumption are :- | |
2689 | * | |
2690 | * o Device is opened / closed. | |
2691 | * o Device I/O is about to begin or has just finished. | |
2692 | * o Device is idling in between work. | |
2693 | * | |
2694 | * This information is also exported via sysfs to userspace. | |
2695 | * | |
2696 | * DRMS will sum the total requested load on the regulator and change | |
2697 | * to the most efficient operating mode if platform constraints allow. | |
2698 | * | |
2699 | * Returns the new regulator mode or error. | |
2700 | */ | |
2701 | int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) | |
2702 | { | |
2703 | struct regulator_dev *rdev = regulator->rdev; | |
2704 | struct regulator *consumer; | |
d92d95b6 | 2705 | int ret, output_uV, input_uV = 0, total_uA_load = 0; |
414c70cb LG |
2706 | unsigned int mode; |
2707 | ||
d92d95b6 SB |
2708 | if (rdev->supply) |
2709 | input_uV = regulator_get_voltage(rdev->supply); | |
2710 | ||
414c70cb LG |
2711 | mutex_lock(&rdev->mutex); |
2712 | ||
a4b41483 MB |
2713 | /* |
2714 | * first check to see if we can set modes at all, otherwise just | |
2715 | * tell the consumer everything is OK. | |
2716 | */ | |
414c70cb LG |
2717 | regulator->uA_load = uA_load; |
2718 | ret = regulator_check_drms(rdev); | |
a4b41483 MB |
2719 | if (ret < 0) { |
2720 | ret = 0; | |
414c70cb | 2721 | goto out; |
a4b41483 | 2722 | } |
414c70cb | 2723 | |
414c70cb LG |
2724 | if (!rdev->desc->ops->get_optimum_mode) |
2725 | goto out; | |
2726 | ||
a4b41483 MB |
2727 | /* |
2728 | * we can actually do this so any errors are indicators of | |
2729 | * potential real failure. | |
2730 | */ | |
2731 | ret = -EINVAL; | |
2732 | ||
854ccbae AL |
2733 | if (!rdev->desc->ops->set_mode) |
2734 | goto out; | |
2735 | ||
414c70cb | 2736 | /* get output voltage */ |
1bf5a1f8 | 2737 | output_uV = _regulator_get_voltage(rdev); |
414c70cb | 2738 | if (output_uV <= 0) { |
5da84fd9 | 2739 | rdev_err(rdev, "invalid output voltage found\n"); |
414c70cb LG |
2740 | goto out; |
2741 | } | |
2742 | ||
d92d95b6 | 2743 | /* No supply? Use constraint voltage */ |
1bf5a1f8 | 2744 | if (input_uV <= 0) |
414c70cb LG |
2745 | input_uV = rdev->constraints->input_uV; |
2746 | if (input_uV <= 0) { | |
5da84fd9 | 2747 | rdev_err(rdev, "invalid input voltage found\n"); |
414c70cb LG |
2748 | goto out; |
2749 | } | |
2750 | ||
2751 | /* calc total requested load for this regulator */ | |
2752 | list_for_each_entry(consumer, &rdev->consumer_list, list) | |
fa2984d4 | 2753 | total_uA_load += consumer->uA_load; |
414c70cb LG |
2754 | |
2755 | mode = rdev->desc->ops->get_optimum_mode(rdev, | |
2756 | input_uV, output_uV, | |
2757 | total_uA_load); | |
2c608234 | 2758 | ret = regulator_mode_constrain(rdev, &mode); |
e573520b | 2759 | if (ret < 0) { |
5da84fd9 JP |
2760 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", |
2761 | total_uA_load, input_uV, output_uV); | |
414c70cb LG |
2762 | goto out; |
2763 | } | |
2764 | ||
2765 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
e573520b | 2766 | if (ret < 0) { |
5da84fd9 | 2767 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); |
414c70cb LG |
2768 | goto out; |
2769 | } | |
2770 | ret = mode; | |
2771 | out: | |
2772 | mutex_unlock(&rdev->mutex); | |
2773 | return ret; | |
2774 | } | |
2775 | EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); | |
2776 | ||
f59c8f9f MB |
2777 | /** |
2778 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
2779 | * | |
2780 | * @regulator: Regulator to configure | |
9345dfb8 | 2781 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
2782 | * |
2783 | * Allow the regulator to go into bypass mode if all other consumers | |
2784 | * for the regulator also enable bypass mode and the machine | |
2785 | * constraints allow this. Bypass mode means that the regulator is | |
2786 | * simply passing the input directly to the output with no regulation. | |
2787 | */ | |
2788 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
2789 | { | |
2790 | struct regulator_dev *rdev = regulator->rdev; | |
2791 | int ret = 0; | |
2792 | ||
2793 | if (!rdev->desc->ops->set_bypass) | |
2794 | return 0; | |
2795 | ||
2796 | if (rdev->constraints && | |
2797 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
2798 | return 0; | |
2799 | ||
2800 | mutex_lock(&rdev->mutex); | |
2801 | ||
2802 | if (enable && !regulator->bypass) { | |
2803 | rdev->bypass_count++; | |
2804 | ||
2805 | if (rdev->bypass_count == rdev->open_count) { | |
2806 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2807 | if (ret != 0) | |
2808 | rdev->bypass_count--; | |
2809 | } | |
2810 | ||
2811 | } else if (!enable && regulator->bypass) { | |
2812 | rdev->bypass_count--; | |
2813 | ||
2814 | if (rdev->bypass_count != rdev->open_count) { | |
2815 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
2816 | if (ret != 0) | |
2817 | rdev->bypass_count++; | |
2818 | } | |
2819 | } | |
2820 | ||
2821 | if (ret == 0) | |
2822 | regulator->bypass = enable; | |
2823 | ||
2824 | mutex_unlock(&rdev->mutex); | |
2825 | ||
2826 | return ret; | |
2827 | } | |
2828 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
2829 | ||
414c70cb LG |
2830 | /** |
2831 | * regulator_register_notifier - register regulator event notifier | |
2832 | * @regulator: regulator source | |
69279fb9 | 2833 | * @nb: notifier block |
414c70cb LG |
2834 | * |
2835 | * Register notifier block to receive regulator events. | |
2836 | */ | |
2837 | int regulator_register_notifier(struct regulator *regulator, | |
2838 | struct notifier_block *nb) | |
2839 | { | |
2840 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
2841 | nb); | |
2842 | } | |
2843 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
2844 | ||
2845 | /** | |
2846 | * regulator_unregister_notifier - unregister regulator event notifier | |
2847 | * @regulator: regulator source | |
69279fb9 | 2848 | * @nb: notifier block |
414c70cb LG |
2849 | * |
2850 | * Unregister regulator event notifier block. | |
2851 | */ | |
2852 | int regulator_unregister_notifier(struct regulator *regulator, | |
2853 | struct notifier_block *nb) | |
2854 | { | |
2855 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
2856 | nb); | |
2857 | } | |
2858 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
2859 | ||
b136fb44 JC |
2860 | /* notify regulator consumers and downstream regulator consumers. |
2861 | * Note mutex must be held by caller. | |
2862 | */ | |
414c70cb LG |
2863 | static void _notifier_call_chain(struct regulator_dev *rdev, |
2864 | unsigned long event, void *data) | |
2865 | { | |
414c70cb | 2866 | /* call rdev chain first */ |
d8493d21 | 2867 | blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
2868 | } |
2869 | ||
2870 | /** | |
2871 | * regulator_bulk_get - get multiple regulator consumers | |
2872 | * | |
2873 | * @dev: Device to supply | |
2874 | * @num_consumers: Number of consumers to register | |
2875 | * @consumers: Configuration of consumers; clients are stored here. | |
2876 | * | |
2877 | * @return 0 on success, an errno on failure. | |
2878 | * | |
2879 | * This helper function allows drivers to get several regulator | |
2880 | * consumers in one operation. If any of the regulators cannot be | |
2881 | * acquired then any regulators that were allocated will be freed | |
2882 | * before returning to the caller. | |
2883 | */ | |
2884 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
2885 | struct regulator_bulk_data *consumers) | |
2886 | { | |
2887 | int i; | |
2888 | int ret; | |
2889 | ||
2890 | for (i = 0; i < num_consumers; i++) | |
2891 | consumers[i].consumer = NULL; | |
2892 | ||
2893 | for (i = 0; i < num_consumers; i++) { | |
2894 | consumers[i].consumer = regulator_get(dev, | |
2895 | consumers[i].supply); | |
2896 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 2897 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
2898 | dev_err(dev, "Failed to get supply '%s': %d\n", |
2899 | consumers[i].supply, ret); | |
414c70cb LG |
2900 | consumers[i].consumer = NULL; |
2901 | goto err; | |
2902 | } | |
2903 | } | |
2904 | ||
2905 | return 0; | |
2906 | ||
2907 | err: | |
b29c7690 | 2908 | while (--i >= 0) |
414c70cb LG |
2909 | regulator_put(consumers[i].consumer); |
2910 | ||
2911 | return ret; | |
2912 | } | |
2913 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
2914 | ||
e6e74030 MB |
2915 | /** |
2916 | * devm_regulator_bulk_get - managed get multiple regulator consumers | |
2917 | * | |
2918 | * @dev: Device to supply | |
2919 | * @num_consumers: Number of consumers to register | |
2920 | * @consumers: Configuration of consumers; clients are stored here. | |
2921 | * | |
2922 | * @return 0 on success, an errno on failure. | |
2923 | * | |
2924 | * This helper function allows drivers to get several regulator | |
2925 | * consumers in one operation with management, the regulators will | |
2926 | * automatically be freed when the device is unbound. If any of the | |
2927 | * regulators cannot be acquired then any regulators that were | |
2928 | * allocated will be freed before returning to the caller. | |
2929 | */ | |
2930 | int devm_regulator_bulk_get(struct device *dev, int num_consumers, | |
2931 | struct regulator_bulk_data *consumers) | |
2932 | { | |
2933 | int i; | |
2934 | int ret; | |
2935 | ||
2936 | for (i = 0; i < num_consumers; i++) | |
2937 | consumers[i].consumer = NULL; | |
2938 | ||
2939 | for (i = 0; i < num_consumers; i++) { | |
2940 | consumers[i].consumer = devm_regulator_get(dev, | |
2941 | consumers[i].supply); | |
2942 | if (IS_ERR(consumers[i].consumer)) { | |
2943 | ret = PTR_ERR(consumers[i].consumer); | |
2944 | dev_err(dev, "Failed to get supply '%s': %d\n", | |
2945 | consumers[i].supply, ret); | |
2946 | consumers[i].consumer = NULL; | |
2947 | goto err; | |
2948 | } | |
2949 | } | |
2950 | ||
2951 | return 0; | |
2952 | ||
2953 | err: | |
2954 | for (i = 0; i < num_consumers && consumers[i].consumer; i++) | |
2955 | devm_regulator_put(consumers[i].consumer); | |
2956 | ||
2957 | return ret; | |
2958 | } | |
2959 | EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); | |
2960 | ||
f21e0e81 MB |
2961 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
2962 | { | |
2963 | struct regulator_bulk_data *bulk = data; | |
2964 | ||
2965 | bulk->ret = regulator_enable(bulk->consumer); | |
2966 | } | |
2967 | ||
414c70cb LG |
2968 | /** |
2969 | * regulator_bulk_enable - enable multiple regulator consumers | |
2970 | * | |
2971 | * @num_consumers: Number of consumers | |
2972 | * @consumers: Consumer data; clients are stored here. | |
2973 | * @return 0 on success, an errno on failure | |
2974 | * | |
2975 | * This convenience API allows consumers to enable multiple regulator | |
2976 | * clients in a single API call. If any consumers cannot be enabled | |
2977 | * then any others that were enabled will be disabled again prior to | |
2978 | * return. | |
2979 | */ | |
2980 | int regulator_bulk_enable(int num_consumers, | |
2981 | struct regulator_bulk_data *consumers) | |
2982 | { | |
2955b47d | 2983 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 2984 | int i; |
f21e0e81 | 2985 | int ret = 0; |
414c70cb | 2986 | |
6492bc1b MB |
2987 | for (i = 0; i < num_consumers; i++) { |
2988 | if (consumers[i].consumer->always_on) | |
2989 | consumers[i].ret = 0; | |
2990 | else | |
2991 | async_schedule_domain(regulator_bulk_enable_async, | |
2992 | &consumers[i], &async_domain); | |
2993 | } | |
f21e0e81 MB |
2994 | |
2995 | async_synchronize_full_domain(&async_domain); | |
2996 | ||
2997 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 2998 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
2999 | if (consumers[i].ret != 0) { |
3000 | ret = consumers[i].ret; | |
414c70cb | 3001 | goto err; |
f21e0e81 | 3002 | } |
414c70cb LG |
3003 | } |
3004 | ||
3005 | return 0; | |
3006 | ||
3007 | err: | |
fbe31057 AH |
3008 | for (i = 0; i < num_consumers; i++) { |
3009 | if (consumers[i].ret < 0) | |
3010 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3011 | consumers[i].ret); | |
3012 | else | |
3013 | regulator_disable(consumers[i].consumer); | |
3014 | } | |
414c70cb LG |
3015 | |
3016 | return ret; | |
3017 | } | |
3018 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3019 | ||
3020 | /** | |
3021 | * regulator_bulk_disable - disable multiple regulator consumers | |
3022 | * | |
3023 | * @num_consumers: Number of consumers | |
3024 | * @consumers: Consumer data; clients are stored here. | |
3025 | * @return 0 on success, an errno on failure | |
3026 | * | |
3027 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3028 | * clients in a single API call. If any consumers cannot be disabled |
3029 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3030 | * return. |
3031 | */ | |
3032 | int regulator_bulk_disable(int num_consumers, | |
3033 | struct regulator_bulk_data *consumers) | |
3034 | { | |
3035 | int i; | |
01e86f49 | 3036 | int ret, r; |
414c70cb | 3037 | |
49e22632 | 3038 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3039 | ret = regulator_disable(consumers[i].consumer); |
3040 | if (ret != 0) | |
3041 | goto err; | |
3042 | } | |
3043 | ||
3044 | return 0; | |
3045 | ||
3046 | err: | |
5da84fd9 | 3047 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3048 | for (++i; i < num_consumers; ++i) { |
3049 | r = regulator_enable(consumers[i].consumer); | |
3050 | if (r != 0) | |
3051 | pr_err("Failed to reename %s: %d\n", | |
3052 | consumers[i].supply, r); | |
3053 | } | |
414c70cb LG |
3054 | |
3055 | return ret; | |
3056 | } | |
3057 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3058 | ||
e1de2f42 DK |
3059 | /** |
3060 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3061 | * | |
3062 | * @num_consumers: Number of consumers | |
3063 | * @consumers: Consumer data; clients are stored here. | |
3064 | * @return 0 on success, an errno on failure | |
3065 | * | |
3066 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3067 | * clients in a single API call. | |
3068 | * NOTE: This should be used for situations when device damage will | |
3069 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3070 | * Although regulator_force_disable function call for some consumers can | |
3071 | * return error numbers, the function is called for all consumers. | |
3072 | */ | |
3073 | int regulator_bulk_force_disable(int num_consumers, | |
3074 | struct regulator_bulk_data *consumers) | |
3075 | { | |
3076 | int i; | |
3077 | int ret; | |
3078 | ||
3079 | for (i = 0; i < num_consumers; i++) | |
3080 | consumers[i].ret = | |
3081 | regulator_force_disable(consumers[i].consumer); | |
3082 | ||
3083 | for (i = 0; i < num_consumers; i++) { | |
3084 | if (consumers[i].ret != 0) { | |
3085 | ret = consumers[i].ret; | |
3086 | goto out; | |
3087 | } | |
3088 | } | |
3089 | ||
3090 | return 0; | |
3091 | out: | |
3092 | return ret; | |
3093 | } | |
3094 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3095 | ||
414c70cb LG |
3096 | /** |
3097 | * regulator_bulk_free - free multiple regulator consumers | |
3098 | * | |
3099 | * @num_consumers: Number of consumers | |
3100 | * @consumers: Consumer data; clients are stored here. | |
3101 | * | |
3102 | * This convenience API allows consumers to free multiple regulator | |
3103 | * clients in a single API call. | |
3104 | */ | |
3105 | void regulator_bulk_free(int num_consumers, | |
3106 | struct regulator_bulk_data *consumers) | |
3107 | { | |
3108 | int i; | |
3109 | ||
3110 | for (i = 0; i < num_consumers; i++) { | |
3111 | regulator_put(consumers[i].consumer); | |
3112 | consumers[i].consumer = NULL; | |
3113 | } | |
3114 | } | |
3115 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3116 | ||
3117 | /** | |
3118 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3119 | * @rdev: regulator source |
414c70cb | 3120 | * @event: notifier block |
69279fb9 | 3121 | * @data: callback-specific data. |
414c70cb LG |
3122 | * |
3123 | * Called by regulator drivers to notify clients a regulator event has | |
3124 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3125 | * Note lock must be held by caller. |
414c70cb LG |
3126 | */ |
3127 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3128 | unsigned long event, void *data) | |
3129 | { | |
3130 | _notifier_call_chain(rdev, event, data); | |
3131 | return NOTIFY_DONE; | |
3132 | ||
3133 | } | |
3134 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3135 | ||
be721979 MB |
3136 | /** |
3137 | * regulator_mode_to_status - convert a regulator mode into a status | |
3138 | * | |
3139 | * @mode: Mode to convert | |
3140 | * | |
3141 | * Convert a regulator mode into a status. | |
3142 | */ | |
3143 | int regulator_mode_to_status(unsigned int mode) | |
3144 | { | |
3145 | switch (mode) { | |
3146 | case REGULATOR_MODE_FAST: | |
3147 | return REGULATOR_STATUS_FAST; | |
3148 | case REGULATOR_MODE_NORMAL: | |
3149 | return REGULATOR_STATUS_NORMAL; | |
3150 | case REGULATOR_MODE_IDLE: | |
3151 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3152 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3153 | return REGULATOR_STATUS_STANDBY; |
3154 | default: | |
1beaf762 | 3155 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3156 | } |
3157 | } | |
3158 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3159 | ||
7ad68e2f DB |
3160 | /* |
3161 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3162 | * create attributes that can be meaningfully displayed. | |
3163 | */ | |
3164 | static int add_regulator_attributes(struct regulator_dev *rdev) | |
3165 | { | |
3166 | struct device *dev = &rdev->dev; | |
3167 | struct regulator_ops *ops = rdev->desc->ops; | |
3168 | int status = 0; | |
3169 | ||
3170 | /* some attributes need specific methods to be displayed */ | |
4c78899b | 3171 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || |
f2889e65 MB |
3172 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || |
3173 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { | |
7ad68e2f DB |
3174 | status = device_create_file(dev, &dev_attr_microvolts); |
3175 | if (status < 0) | |
3176 | return status; | |
3177 | } | |
3178 | if (ops->get_current_limit) { | |
3179 | status = device_create_file(dev, &dev_attr_microamps); | |
3180 | if (status < 0) | |
3181 | return status; | |
3182 | } | |
3183 | if (ops->get_mode) { | |
3184 | status = device_create_file(dev, &dev_attr_opmode); | |
3185 | if (status < 0) | |
3186 | return status; | |
3187 | } | |
7b74d149 | 3188 | if (rdev->ena_pin || ops->is_enabled) { |
7ad68e2f DB |
3189 | status = device_create_file(dev, &dev_attr_state); |
3190 | if (status < 0) | |
3191 | return status; | |
3192 | } | |
853116a1 DB |
3193 | if (ops->get_status) { |
3194 | status = device_create_file(dev, &dev_attr_status); | |
3195 | if (status < 0) | |
3196 | return status; | |
3197 | } | |
f59c8f9f MB |
3198 | if (ops->get_bypass) { |
3199 | status = device_create_file(dev, &dev_attr_bypass); | |
3200 | if (status < 0) | |
3201 | return status; | |
3202 | } | |
7ad68e2f DB |
3203 | |
3204 | /* some attributes are type-specific */ | |
3205 | if (rdev->desc->type == REGULATOR_CURRENT) { | |
3206 | status = device_create_file(dev, &dev_attr_requested_microamps); | |
3207 | if (status < 0) | |
3208 | return status; | |
3209 | } | |
3210 | ||
3211 | /* all the other attributes exist to support constraints; | |
3212 | * don't show them if there are no constraints, or if the | |
3213 | * relevant supporting methods are missing. | |
3214 | */ | |
3215 | if (!rdev->constraints) | |
3216 | return status; | |
3217 | ||
3218 | /* constraints need specific supporting methods */ | |
e8eef82b | 3219 | if (ops->set_voltage || ops->set_voltage_sel) { |
7ad68e2f DB |
3220 | status = device_create_file(dev, &dev_attr_min_microvolts); |
3221 | if (status < 0) | |
3222 | return status; | |
3223 | status = device_create_file(dev, &dev_attr_max_microvolts); | |
3224 | if (status < 0) | |
3225 | return status; | |
3226 | } | |
3227 | if (ops->set_current_limit) { | |
3228 | status = device_create_file(dev, &dev_attr_min_microamps); | |
3229 | if (status < 0) | |
3230 | return status; | |
3231 | status = device_create_file(dev, &dev_attr_max_microamps); | |
3232 | if (status < 0) | |
3233 | return status; | |
3234 | } | |
3235 | ||
7ad68e2f DB |
3236 | status = device_create_file(dev, &dev_attr_suspend_standby_state); |
3237 | if (status < 0) | |
3238 | return status; | |
3239 | status = device_create_file(dev, &dev_attr_suspend_mem_state); | |
3240 | if (status < 0) | |
3241 | return status; | |
3242 | status = device_create_file(dev, &dev_attr_suspend_disk_state); | |
3243 | if (status < 0) | |
3244 | return status; | |
3245 | ||
3246 | if (ops->set_suspend_voltage) { | |
3247 | status = device_create_file(dev, | |
3248 | &dev_attr_suspend_standby_microvolts); | |
3249 | if (status < 0) | |
3250 | return status; | |
3251 | status = device_create_file(dev, | |
3252 | &dev_attr_suspend_mem_microvolts); | |
3253 | if (status < 0) | |
3254 | return status; | |
3255 | status = device_create_file(dev, | |
3256 | &dev_attr_suspend_disk_microvolts); | |
3257 | if (status < 0) | |
3258 | return status; | |
3259 | } | |
3260 | ||
3261 | if (ops->set_suspend_mode) { | |
3262 | status = device_create_file(dev, | |
3263 | &dev_attr_suspend_standby_mode); | |
3264 | if (status < 0) | |
3265 | return status; | |
3266 | status = device_create_file(dev, | |
3267 | &dev_attr_suspend_mem_mode); | |
3268 | if (status < 0) | |
3269 | return status; | |
3270 | status = device_create_file(dev, | |
3271 | &dev_attr_suspend_disk_mode); | |
3272 | if (status < 0) | |
3273 | return status; | |
3274 | } | |
3275 | ||
3276 | return status; | |
3277 | } | |
3278 | ||
1130e5b3 MB |
3279 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3280 | { | |
1130e5b3 | 3281 | rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); |
24751434 | 3282 | if (!rdev->debugfs) { |
1130e5b3 | 3283 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3284 | return; |
3285 | } | |
3286 | ||
3287 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3288 | &rdev->use_count); | |
3289 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3290 | &rdev->open_count); | |
f59c8f9f MB |
3291 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3292 | &rdev->bypass_count); | |
1130e5b3 MB |
3293 | } |
3294 | ||
414c70cb LG |
3295 | /** |
3296 | * regulator_register - register regulator | |
69279fb9 | 3297 | * @regulator_desc: regulator to register |
c172708d | 3298 | * @config: runtime configuration for regulator |
414c70cb LG |
3299 | * |
3300 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3301 | * Returns a valid pointer to struct regulator_dev on success |
3302 | * or an ERR_PTR() on error. | |
414c70cb | 3303 | */ |
65f26846 MB |
3304 | struct regulator_dev * |
3305 | regulator_register(const struct regulator_desc *regulator_desc, | |
c172708d | 3306 | const struct regulator_config *config) |
414c70cb | 3307 | { |
9a8f5e07 | 3308 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3309 | const struct regulator_init_data *init_data; |
414c70cb LG |
3310 | static atomic_t regulator_no = ATOMIC_INIT(0); |
3311 | struct regulator_dev *rdev; | |
32c8fad4 | 3312 | struct device *dev; |
a5766f11 | 3313 | int ret, i; |
69511a45 | 3314 | const char *supply = NULL; |
414c70cb | 3315 | |
c172708d | 3316 | if (regulator_desc == NULL || config == NULL) |
414c70cb LG |
3317 | return ERR_PTR(-EINVAL); |
3318 | ||
32c8fad4 | 3319 | dev = config->dev; |
dcf70112 | 3320 | WARN_ON(!dev); |
32c8fad4 | 3321 | |
414c70cb LG |
3322 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3323 | return ERR_PTR(-EINVAL); | |
3324 | ||
cd78dfc6 DL |
3325 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3326 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3327 | return ERR_PTR(-EINVAL); |
3328 | ||
476c2d83 MB |
3329 | /* Only one of each should be implemented */ |
3330 | WARN_ON(regulator_desc->ops->get_voltage && | |
3331 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3332 | WARN_ON(regulator_desc->ops->set_voltage && |
3333 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3334 | |
3335 | /* If we're using selectors we must implement list_voltage. */ | |
3336 | if (regulator_desc->ops->get_voltage_sel && | |
3337 | !regulator_desc->ops->list_voltage) { | |
3338 | return ERR_PTR(-EINVAL); | |
3339 | } | |
e8eef82b MB |
3340 | if (regulator_desc->ops->set_voltage_sel && |
3341 | !regulator_desc->ops->list_voltage) { | |
3342 | return ERR_PTR(-EINVAL); | |
3343 | } | |
476c2d83 | 3344 | |
c172708d MB |
3345 | init_data = config->init_data; |
3346 | ||
414c70cb LG |
3347 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3348 | if (rdev == NULL) | |
3349 | return ERR_PTR(-ENOMEM); | |
3350 | ||
3351 | mutex_lock(®ulator_list_mutex); | |
3352 | ||
3353 | mutex_init(&rdev->mutex); | |
c172708d | 3354 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3355 | rdev->owner = regulator_desc->owner; |
3356 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3357 | if (config->regmap) |
3358 | rdev->regmap = config->regmap; | |
52b84dac | 3359 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3360 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3361 | else if (dev->parent) |
3362 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3363 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3364 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3365 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3366 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3367 | |
a5766f11 | 3368 | /* preform any regulator specific init */ |
9a8f5e07 | 3369 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3370 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3371 | if (ret < 0) |
3372 | goto clean; | |
a5766f11 LG |
3373 | } |
3374 | ||
a5766f11 | 3375 | /* register with sysfs */ |
414c70cb | 3376 | rdev->dev.class = ®ulator_class; |
c172708d | 3377 | rdev->dev.of_node = config->of_node; |
a5766f11 | 3378 | rdev->dev.parent = dev; |
812460a9 KS |
3379 | dev_set_name(&rdev->dev, "regulator.%d", |
3380 | atomic_inc_return(®ulator_no) - 1); | |
a5766f11 | 3381 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3382 | if (ret != 0) { |
3383 | put_device(&rdev->dev); | |
4fca9545 | 3384 | goto clean; |
ad7725cb | 3385 | } |
a5766f11 LG |
3386 | |
3387 | dev_set_drvdata(&rdev->dev, rdev); | |
3388 | ||
b2a1ef47 | 3389 | if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { |
f19b00da | 3390 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3391 | if (ret != 0) { |
3392 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3393 | config->ena_gpio, ret); | |
b2da55d9 | 3394 | goto wash; |
65f73508 MB |
3395 | } |
3396 | ||
65f73508 MB |
3397 | if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) |
3398 | rdev->ena_gpio_state = 1; | |
3399 | ||
7b74d149 | 3400 | if (config->ena_gpio_invert) |
65f73508 MB |
3401 | rdev->ena_gpio_state = !rdev->ena_gpio_state; |
3402 | } | |
3403 | ||
74f544c1 | 3404 | /* set regulator constraints */ |
9a8f5e07 MB |
3405 | if (init_data) |
3406 | constraints = &init_data->constraints; | |
3407 | ||
3408 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3409 | if (ret < 0) |
3410 | goto scrub; | |
3411 | ||
7ad68e2f DB |
3412 | /* add attributes supported by this regulator */ |
3413 | ret = add_regulator_attributes(rdev); | |
3414 | if (ret < 0) | |
3415 | goto scrub; | |
3416 | ||
9a8f5e07 | 3417 | if (init_data && init_data->supply_regulator) |
69511a45 RN |
3418 | supply = init_data->supply_regulator; |
3419 | else if (regulator_desc->supply_name) | |
3420 | supply = regulator_desc->supply_name; | |
3421 | ||
3422 | if (supply) { | |
0178f3e2 | 3423 | struct regulator_dev *r; |
0178f3e2 | 3424 | |
6d191a5f | 3425 | r = regulator_dev_lookup(dev, supply, &ret); |
0178f3e2 | 3426 | |
0f7b87f0 AB |
3427 | if (ret == -ENODEV) { |
3428 | /* | |
3429 | * No supply was specified for this regulator and | |
3430 | * there will never be one. | |
3431 | */ | |
3432 | ret = 0; | |
3433 | goto add_dev; | |
3434 | } else if (!r) { | |
69511a45 | 3435 | dev_err(dev, "Failed to find supply %s\n", supply); |
04bf3011 | 3436 | ret = -EPROBE_DEFER; |
0178f3e2 MB |
3437 | goto scrub; |
3438 | } | |
3439 | ||
3440 | ret = set_supply(rdev, r); | |
3441 | if (ret < 0) | |
3442 | goto scrub; | |
b2296bd4 LD |
3443 | |
3444 | /* Enable supply if rail is enabled */ | |
b1a86831 | 3445 | if (_regulator_is_enabled(rdev)) { |
b2296bd4 LD |
3446 | ret = regulator_enable(rdev->supply); |
3447 | if (ret < 0) | |
3448 | goto scrub; | |
3449 | } | |
0178f3e2 MB |
3450 | } |
3451 | ||
0f7b87f0 | 3452 | add_dev: |
a5766f11 | 3453 | /* add consumers devices */ |
9a8f5e07 MB |
3454 | if (init_data) { |
3455 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3456 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3457 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3458 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3459 | if (ret < 0) { |
3460 | dev_err(dev, "Failed to set supply %s\n", | |
3461 | init_data->consumer_supplies[i].supply); | |
3462 | goto unset_supplies; | |
3463 | } | |
23c2f041 | 3464 | } |
414c70cb | 3465 | } |
a5766f11 LG |
3466 | |
3467 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3468 | |
3469 | rdev_init_debugfs(rdev); | |
a5766f11 | 3470 | out: |
414c70cb LG |
3471 | mutex_unlock(®ulator_list_mutex); |
3472 | return rdev; | |
4fca9545 | 3473 | |
d4033b54 JN |
3474 | unset_supplies: |
3475 | unset_regulator_supplies(rdev); | |
3476 | ||
4fca9545 | 3477 | scrub: |
e81dba85 | 3478 | if (rdev->supply) |
23ff2f0f | 3479 | _regulator_put(rdev->supply); |
f19b00da | 3480 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3481 | kfree(rdev->constraints); |
b2da55d9 | 3482 | wash: |
4fca9545 | 3483 | device_unregister(&rdev->dev); |
53032daf PW |
3484 | /* device core frees rdev */ |
3485 | rdev = ERR_PTR(ret); | |
3486 | goto out; | |
3487 | ||
4fca9545 DB |
3488 | clean: |
3489 | kfree(rdev); | |
3490 | rdev = ERR_PTR(ret); | |
3491 | goto out; | |
414c70cb LG |
3492 | } |
3493 | EXPORT_SYMBOL_GPL(regulator_register); | |
3494 | ||
3495 | /** | |
3496 | * regulator_unregister - unregister regulator | |
69279fb9 | 3497 | * @rdev: regulator to unregister |
414c70cb LG |
3498 | * |
3499 | * Called by regulator drivers to unregister a regulator. | |
3500 | */ | |
3501 | void regulator_unregister(struct regulator_dev *rdev) | |
3502 | { | |
3503 | if (rdev == NULL) | |
3504 | return; | |
3505 | ||
891636ea MB |
3506 | if (rdev->supply) { |
3507 | while (rdev->use_count--) | |
3508 | regulator_disable(rdev->supply); | |
e032b376 | 3509 | regulator_put(rdev->supply); |
891636ea | 3510 | } |
414c70cb | 3511 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3512 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3513 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3514 | WARN_ON(rdev->open_count); |
0f1d747b | 3515 | unset_regulator_supplies(rdev); |
414c70cb | 3516 | list_del(&rdev->list); |
f8c12fe3 | 3517 | kfree(rdev->constraints); |
f19b00da | 3518 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 3519 | device_unregister(&rdev->dev); |
414c70cb LG |
3520 | mutex_unlock(®ulator_list_mutex); |
3521 | } | |
3522 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3523 | ||
414c70cb | 3524 | /** |
cf7bbcdf | 3525 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3526 | * @state: system suspend state |
3527 | * | |
3528 | * Configure each regulator with it's suspend operating parameters for state. | |
3529 | * This will usually be called by machine suspend code prior to supending. | |
3530 | */ | |
3531 | int regulator_suspend_prepare(suspend_state_t state) | |
3532 | { | |
3533 | struct regulator_dev *rdev; | |
3534 | int ret = 0; | |
3535 | ||
3536 | /* ON is handled by regulator active state */ | |
3537 | if (state == PM_SUSPEND_ON) | |
3538 | return -EINVAL; | |
3539 | ||
3540 | mutex_lock(®ulator_list_mutex); | |
3541 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3542 | ||
3543 | mutex_lock(&rdev->mutex); | |
3544 | ret = suspend_prepare(rdev, state); | |
3545 | mutex_unlock(&rdev->mutex); | |
3546 | ||
3547 | if (ret < 0) { | |
5da84fd9 | 3548 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3549 | goto out; |
3550 | } | |
3551 | } | |
3552 | out: | |
3553 | mutex_unlock(®ulator_list_mutex); | |
3554 | return ret; | |
3555 | } | |
3556 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3557 | ||
7a32b589 MH |
3558 | /** |
3559 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3560 | * | |
3561 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3562 | * and that should be turned on according to the regulators properties. | |
3563 | */ | |
3564 | int regulator_suspend_finish(void) | |
3565 | { | |
3566 | struct regulator_dev *rdev; | |
3567 | int ret = 0, error; | |
3568 | ||
3569 | mutex_lock(®ulator_list_mutex); | |
3570 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3571 | struct regulator_ops *ops = rdev->desc->ops; | |
3572 | ||
3573 | mutex_lock(&rdev->mutex); | |
3574 | if ((rdev->use_count > 0 || rdev->constraints->always_on) && | |
3575 | ops->enable) { | |
3576 | error = ops->enable(rdev); | |
3577 | if (error) | |
3578 | ret = error; | |
3579 | } else { | |
3580 | if (!has_full_constraints) | |
3581 | goto unlock; | |
3582 | if (!ops->disable) | |
3583 | goto unlock; | |
b1a86831 | 3584 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3585 | goto unlock; |
3586 | ||
3587 | error = ops->disable(rdev); | |
3588 | if (error) | |
3589 | ret = error; | |
3590 | } | |
3591 | unlock: | |
3592 | mutex_unlock(&rdev->mutex); | |
3593 | } | |
3594 | mutex_unlock(®ulator_list_mutex); | |
3595 | return ret; | |
3596 | } | |
3597 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3598 | ||
ca725561 MB |
3599 | /** |
3600 | * regulator_has_full_constraints - the system has fully specified constraints | |
3601 | * | |
3602 | * Calling this function will cause the regulator API to disable all | |
3603 | * regulators which have a zero use count and don't have an always_on | |
3604 | * constraint in a late_initcall. | |
3605 | * | |
3606 | * The intention is that this will become the default behaviour in a | |
3607 | * future kernel release so users are encouraged to use this facility | |
3608 | * now. | |
3609 | */ | |
3610 | void regulator_has_full_constraints(void) | |
3611 | { | |
3612 | has_full_constraints = 1; | |
3613 | } | |
3614 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3615 | ||
688fe99a MB |
3616 | /** |
3617 | * regulator_use_dummy_regulator - Provide a dummy regulator when none is found | |
3618 | * | |
3619 | * Calling this function will cause the regulator API to provide a | |
3620 | * dummy regulator to consumers if no physical regulator is found, | |
3621 | * allowing most consumers to proceed as though a regulator were | |
3622 | * configured. This allows systems such as those with software | |
3623 | * controllable regulators for the CPU core only to be brought up more | |
3624 | * readily. | |
3625 | */ | |
3626 | void regulator_use_dummy_regulator(void) | |
3627 | { | |
3628 | board_wants_dummy_regulator = true; | |
3629 | } | |
3630 | EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); | |
3631 | ||
414c70cb LG |
3632 | /** |
3633 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3634 | * @rdev: regulator |
414c70cb LG |
3635 | * |
3636 | * Get rdev regulator driver private data. This call can be used in the | |
3637 | * regulator driver context. | |
3638 | */ | |
3639 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3640 | { | |
3641 | return rdev->reg_data; | |
3642 | } | |
3643 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3644 | ||
3645 | /** | |
3646 | * regulator_get_drvdata - get regulator driver data | |
3647 | * @regulator: regulator | |
3648 | * | |
3649 | * Get regulator driver private data. This call can be used in the consumer | |
3650 | * driver context when non API regulator specific functions need to be called. | |
3651 | */ | |
3652 | void *regulator_get_drvdata(struct regulator *regulator) | |
3653 | { | |
3654 | return regulator->rdev->reg_data; | |
3655 | } | |
3656 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3657 | ||
3658 | /** | |
3659 | * regulator_set_drvdata - set regulator driver data | |
3660 | * @regulator: regulator | |
3661 | * @data: data | |
3662 | */ | |
3663 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3664 | { | |
3665 | regulator->rdev->reg_data = data; | |
3666 | } | |
3667 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3668 | ||
3669 | /** | |
3670 | * regulator_get_id - get regulator ID | |
69279fb9 | 3671 | * @rdev: regulator |
414c70cb LG |
3672 | */ |
3673 | int rdev_get_id(struct regulator_dev *rdev) | |
3674 | { | |
3675 | return rdev->desc->id; | |
3676 | } | |
3677 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
3678 | ||
a5766f11 LG |
3679 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
3680 | { | |
3681 | return &rdev->dev; | |
3682 | } | |
3683 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
3684 | ||
3685 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
3686 | { | |
3687 | return reg_init_data->driver_data; | |
3688 | } | |
3689 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
3690 | ||
ba55a974 MB |
3691 | #ifdef CONFIG_DEBUG_FS |
3692 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
3693 | size_t count, loff_t *ppos) | |
3694 | { | |
3695 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3696 | ssize_t len, ret = 0; | |
3697 | struct regulator_map *map; | |
3698 | ||
3699 | if (!buf) | |
3700 | return -ENOMEM; | |
3701 | ||
3702 | list_for_each_entry(map, ®ulator_map_list, list) { | |
3703 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
3704 | "%s -> %s.%s\n", | |
3705 | rdev_get_name(map->regulator), map->dev_name, | |
3706 | map->supply); | |
3707 | if (len >= 0) | |
3708 | ret += len; | |
3709 | if (ret > PAGE_SIZE) { | |
3710 | ret = PAGE_SIZE; | |
3711 | break; | |
3712 | } | |
3713 | } | |
3714 | ||
3715 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
3716 | ||
3717 | kfree(buf); | |
3718 | ||
3719 | return ret; | |
3720 | } | |
24751434 | 3721 | #endif |
ba55a974 MB |
3722 | |
3723 | static const struct file_operations supply_map_fops = { | |
24751434 | 3724 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
3725 | .read = supply_map_read_file, |
3726 | .llseek = default_llseek, | |
ba55a974 | 3727 | #endif |
24751434 | 3728 | }; |
ba55a974 | 3729 | |
414c70cb LG |
3730 | static int __init regulator_init(void) |
3731 | { | |
34abbd68 MB |
3732 | int ret; |
3733 | ||
34abbd68 MB |
3734 | ret = class_register(®ulator_class); |
3735 | ||
1130e5b3 | 3736 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 3737 | if (!debugfs_root) |
1130e5b3 | 3738 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 3739 | |
f4d562c6 MB |
3740 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
3741 | &supply_map_fops); | |
1130e5b3 | 3742 | |
34abbd68 MB |
3743 | regulator_dummy_init(); |
3744 | ||
3745 | return ret; | |
414c70cb LG |
3746 | } |
3747 | ||
3748 | /* init early to allow our consumers to complete system booting */ | |
3749 | core_initcall(regulator_init); | |
ca725561 MB |
3750 | |
3751 | static int __init regulator_init_complete(void) | |
3752 | { | |
3753 | struct regulator_dev *rdev; | |
3754 | struct regulator_ops *ops; | |
3755 | struct regulation_constraints *c; | |
3756 | int enabled, ret; | |
ca725561 | 3757 | |
86f5fcfc MB |
3758 | /* |
3759 | * Since DT doesn't provide an idiomatic mechanism for | |
3760 | * enabling full constraints and since it's much more natural | |
3761 | * with DT to provide them just assume that a DT enabled | |
3762 | * system has full constraints. | |
3763 | */ | |
3764 | if (of_have_populated_dt()) | |
3765 | has_full_constraints = true; | |
3766 | ||
ca725561 MB |
3767 | mutex_lock(®ulator_list_mutex); |
3768 | ||
3769 | /* If we have a full configuration then disable any regulators | |
3770 | * which are not in use or always_on. This will become the | |
3771 | * default behaviour in the future. | |
3772 | */ | |
3773 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3774 | ops = rdev->desc->ops; | |
3775 | c = rdev->constraints; | |
3776 | ||
f25e0b4f | 3777 | if (!ops->disable || (c && c->always_on)) |
ca725561 MB |
3778 | continue; |
3779 | ||
3780 | mutex_lock(&rdev->mutex); | |
3781 | ||
3782 | if (rdev->use_count) | |
3783 | goto unlock; | |
3784 | ||
3785 | /* If we can't read the status assume it's on. */ | |
3786 | if (ops->is_enabled) | |
3787 | enabled = ops->is_enabled(rdev); | |
3788 | else | |
3789 | enabled = 1; | |
3790 | ||
3791 | if (!enabled) | |
3792 | goto unlock; | |
3793 | ||
3794 | if (has_full_constraints) { | |
3795 | /* We log since this may kill the system if it | |
3796 | * goes wrong. */ | |
5da84fd9 | 3797 | rdev_info(rdev, "disabling\n"); |
ca725561 MB |
3798 | ret = ops->disable(rdev); |
3799 | if (ret != 0) { | |
5da84fd9 | 3800 | rdev_err(rdev, "couldn't disable: %d\n", ret); |
ca725561 MB |
3801 | } |
3802 | } else { | |
3803 | /* The intention is that in future we will | |
3804 | * assume that full constraints are provided | |
3805 | * so warn even if we aren't going to do | |
3806 | * anything here. | |
3807 | */ | |
5da84fd9 | 3808 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); |
ca725561 MB |
3809 | } |
3810 | ||
3811 | unlock: | |
3812 | mutex_unlock(&rdev->mutex); | |
3813 | } | |
3814 | ||
3815 | mutex_unlock(®ulator_list_mutex); | |
3816 | ||
3817 | return 0; | |
3818 | } | |
3819 | late_initcall(regulator_init_complete); |