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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> |
778b28b4 | 27 | #include <linux/gpio/consumer.h> |
69511a45 | 28 | #include <linux/of.h> |
65b19ce6 | 29 | #include <linux/regmap.h> |
69511a45 | 30 | #include <linux/regulator/of_regulator.h> |
414c70cb LG |
31 | #include <linux/regulator/consumer.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
65602c32 | 34 | #include <linux/module.h> |
414c70cb | 35 | |
02fa3ec0 MB |
36 | #define CREATE_TRACE_POINTS |
37 | #include <trace/events/regulator.h> | |
38 | ||
34abbd68 | 39 | #include "dummy.h" |
0cdfcc0f | 40 | #include "internal.h" |
34abbd68 | 41 | |
7d51a0db MB |
42 | #define rdev_crit(rdev, fmt, ...) \ |
43 | pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
5da84fd9 JP |
44 | #define rdev_err(rdev, fmt, ...) \ |
45 | pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
46 | #define rdev_warn(rdev, fmt, ...) \ | |
47 | pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
48 | #define rdev_info(rdev, fmt, ...) \ | |
49 | pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
50 | #define rdev_dbg(rdev, fmt, ...) \ | |
51 | pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) | |
52 | ||
414c70cb LG |
53 | static DEFINE_MUTEX(regulator_list_mutex); |
54 | static LIST_HEAD(regulator_list); | |
55 | static LIST_HEAD(regulator_map_list); | |
f19b00da | 56 | static LIST_HEAD(regulator_ena_gpio_list); |
a06ccd9c | 57 | static LIST_HEAD(regulator_supply_alias_list); |
21cf891a | 58 | static bool has_full_constraints; |
414c70cb | 59 | |
1130e5b3 | 60 | static struct dentry *debugfs_root; |
1130e5b3 | 61 | |
8dc5390d | 62 | /* |
414c70cb LG |
63 | * struct regulator_map |
64 | * | |
65 | * Used to provide symbolic supply names to devices. | |
66 | */ | |
67 | struct regulator_map { | |
68 | struct list_head list; | |
40f9244f | 69 | const char *dev_name; /* The dev_name() for the consumer */ |
414c70cb | 70 | const char *supply; |
a5766f11 | 71 | struct regulator_dev *regulator; |
414c70cb LG |
72 | }; |
73 | ||
f19b00da KM |
74 | /* |
75 | * struct regulator_enable_gpio | |
76 | * | |
77 | * Management for shared enable GPIO pin | |
78 | */ | |
79 | struct regulator_enable_gpio { | |
80 | struct list_head list; | |
778b28b4 | 81 | struct gpio_desc *gpiod; |
f19b00da KM |
82 | u32 enable_count; /* a number of enabled shared GPIO */ |
83 | u32 request_count; /* a number of requested shared GPIO */ | |
84 | unsigned int ena_gpio_invert:1; | |
85 | }; | |
86 | ||
a06ccd9c CK |
87 | /* |
88 | * struct regulator_supply_alias | |
89 | * | |
90 | * Used to map lookups for a supply onto an alternative device. | |
91 | */ | |
92 | struct regulator_supply_alias { | |
93 | struct list_head list; | |
94 | struct device *src_dev; | |
95 | const char *src_supply; | |
96 | struct device *alias_dev; | |
97 | const char *alias_supply; | |
98 | }; | |
99 | ||
414c70cb | 100 | static int _regulator_is_enabled(struct regulator_dev *rdev); |
3801b86a | 101 | static int _regulator_disable(struct regulator_dev *rdev); |
414c70cb LG |
102 | static int _regulator_get_voltage(struct regulator_dev *rdev); |
103 | static int _regulator_get_current_limit(struct regulator_dev *rdev); | |
104 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev); | |
7179569a | 105 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb | 106 | unsigned long event, void *data); |
75790251 MB |
107 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
108 | int min_uV, int max_uV); | |
3801b86a MB |
109 | static struct regulator *create_regulator(struct regulator_dev *rdev, |
110 | struct device *dev, | |
111 | const char *supply_name); | |
36a1f1b6 | 112 | static void _regulator_put(struct regulator *regulator); |
414c70cb | 113 | |
609ca5f3 MB |
114 | static struct regulator_dev *dev_to_rdev(struct device *dev) |
115 | { | |
116 | return container_of(dev, struct regulator_dev, dev); | |
117 | } | |
414c70cb | 118 | |
1083c393 MB |
119 | static const char *rdev_get_name(struct regulator_dev *rdev) |
120 | { | |
121 | if (rdev->constraints && rdev->constraints->name) | |
122 | return rdev->constraints->name; | |
123 | else if (rdev->desc->name) | |
124 | return rdev->desc->name; | |
125 | else | |
126 | return ""; | |
127 | } | |
128 | ||
87b28417 MB |
129 | static bool have_full_constraints(void) |
130 | { | |
75bc9641 | 131 | return has_full_constraints || of_have_populated_dt(); |
87b28417 MB |
132 | } |
133 | ||
69511a45 RN |
134 | /** |
135 | * of_get_regulator - get a regulator device node based on supply name | |
136 | * @dev: Device pointer for the consumer (of regulator) device | |
137 | * @supply: regulator supply name | |
138 | * | |
139 | * Extract the regulator device node corresponding to the supply name. | |
167d41dc | 140 | * returns the device node corresponding to the regulator if found, else |
69511a45 RN |
141 | * returns NULL. |
142 | */ | |
143 | static struct device_node *of_get_regulator(struct device *dev, const char *supply) | |
144 | { | |
145 | struct device_node *regnode = NULL; | |
146 | char prop_name[32]; /* 32 is max size of property name */ | |
147 | ||
148 | dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); | |
149 | ||
150 | snprintf(prop_name, 32, "%s-supply", supply); | |
151 | regnode = of_parse_phandle(dev->of_node, prop_name, 0); | |
152 | ||
153 | if (!regnode) { | |
16fbcc3b | 154 | dev_dbg(dev, "Looking up %s property in node %s failed", |
69511a45 RN |
155 | prop_name, dev->of_node->full_name); |
156 | return NULL; | |
157 | } | |
158 | return regnode; | |
159 | } | |
160 | ||
6492bc1b MB |
161 | static int _regulator_can_change_status(struct regulator_dev *rdev) |
162 | { | |
163 | if (!rdev->constraints) | |
164 | return 0; | |
165 | ||
166 | if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) | |
167 | return 1; | |
168 | else | |
169 | return 0; | |
170 | } | |
171 | ||
414c70cb LG |
172 | /* Platform voltage constraint check */ |
173 | static int regulator_check_voltage(struct regulator_dev *rdev, | |
174 | int *min_uV, int *max_uV) | |
175 | { | |
176 | BUG_ON(*min_uV > *max_uV); | |
177 | ||
178 | if (!rdev->constraints) { | |
5da84fd9 | 179 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
180 | return -ENODEV; |
181 | } | |
182 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
5da84fd9 | 183 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
184 | return -EPERM; |
185 | } | |
186 | ||
187 | if (*max_uV > rdev->constraints->max_uV) | |
188 | *max_uV = rdev->constraints->max_uV; | |
189 | if (*min_uV < rdev->constraints->min_uV) | |
190 | *min_uV = rdev->constraints->min_uV; | |
191 | ||
89f425ed MB |
192 | if (*min_uV > *max_uV) { |
193 | rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", | |
54abd335 | 194 | *min_uV, *max_uV); |
414c70cb | 195 | return -EINVAL; |
89f425ed | 196 | } |
414c70cb LG |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
05fda3b1 TP |
201 | /* Make sure we select a voltage that suits the needs of all |
202 | * regulator consumers | |
203 | */ | |
204 | static int regulator_check_consumers(struct regulator_dev *rdev, | |
205 | int *min_uV, int *max_uV) | |
206 | { | |
207 | struct regulator *regulator; | |
208 | ||
209 | list_for_each_entry(regulator, &rdev->consumer_list, list) { | |
4aa922c0 MB |
210 | /* |
211 | * Assume consumers that didn't say anything are OK | |
212 | * with anything in the constraint range. | |
213 | */ | |
214 | if (!regulator->min_uV && !regulator->max_uV) | |
215 | continue; | |
216 | ||
05fda3b1 TP |
217 | if (*max_uV > regulator->max_uV) |
218 | *max_uV = regulator->max_uV; | |
219 | if (*min_uV < regulator->min_uV) | |
220 | *min_uV = regulator->min_uV; | |
221 | } | |
222 | ||
dd8004af | 223 | if (*min_uV > *max_uV) { |
9c7b4e8a RD |
224 | rdev_err(rdev, "Restricting voltage, %u-%uuV\n", |
225 | *min_uV, *max_uV); | |
05fda3b1 | 226 | return -EINVAL; |
dd8004af | 227 | } |
05fda3b1 TP |
228 | |
229 | return 0; | |
230 | } | |
231 | ||
414c70cb LG |
232 | /* current constraint check */ |
233 | static int regulator_check_current_limit(struct regulator_dev *rdev, | |
234 | int *min_uA, int *max_uA) | |
235 | { | |
236 | BUG_ON(*min_uA > *max_uA); | |
237 | ||
238 | if (!rdev->constraints) { | |
5da84fd9 | 239 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
240 | return -ENODEV; |
241 | } | |
242 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { | |
5da84fd9 | 243 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
244 | return -EPERM; |
245 | } | |
246 | ||
247 | if (*max_uA > rdev->constraints->max_uA) | |
248 | *max_uA = rdev->constraints->max_uA; | |
249 | if (*min_uA < rdev->constraints->min_uA) | |
250 | *min_uA = rdev->constraints->min_uA; | |
251 | ||
89f425ed MB |
252 | if (*min_uA > *max_uA) { |
253 | rdev_err(rdev, "unsupportable current range: %d-%duA\n", | |
54abd335 | 254 | *min_uA, *max_uA); |
414c70cb | 255 | return -EINVAL; |
89f425ed | 256 | } |
414c70cb LG |
257 | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* operating mode constraint check */ | |
2c608234 | 262 | static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) |
414c70cb | 263 | { |
2c608234 | 264 | switch (*mode) { |
e573520b DB |
265 | case REGULATOR_MODE_FAST: |
266 | case REGULATOR_MODE_NORMAL: | |
267 | case REGULATOR_MODE_IDLE: | |
268 | case REGULATOR_MODE_STANDBY: | |
269 | break; | |
270 | default: | |
89f425ed | 271 | rdev_err(rdev, "invalid mode %x specified\n", *mode); |
e573520b DB |
272 | return -EINVAL; |
273 | } | |
274 | ||
414c70cb | 275 | if (!rdev->constraints) { |
5da84fd9 | 276 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
277 | return -ENODEV; |
278 | } | |
279 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { | |
5da84fd9 | 280 | rdev_err(rdev, "operation not allowed\n"); |
414c70cb LG |
281 | return -EPERM; |
282 | } | |
2c608234 MB |
283 | |
284 | /* The modes are bitmasks, the most power hungry modes having | |
285 | * the lowest values. If the requested mode isn't supported | |
286 | * try higher modes. */ | |
287 | while (*mode) { | |
288 | if (rdev->constraints->valid_modes_mask & *mode) | |
289 | return 0; | |
290 | *mode /= 2; | |
414c70cb | 291 | } |
2c608234 MB |
292 | |
293 | return -EINVAL; | |
414c70cb LG |
294 | } |
295 | ||
296 | /* dynamic regulator mode switching constraint check */ | |
297 | static int regulator_check_drms(struct regulator_dev *rdev) | |
298 | { | |
299 | if (!rdev->constraints) { | |
5da84fd9 | 300 | rdev_err(rdev, "no constraints\n"); |
414c70cb LG |
301 | return -ENODEV; |
302 | } | |
303 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { | |
099982fa | 304 | rdev_dbg(rdev, "operation not allowed\n"); |
414c70cb LG |
305 | return -EPERM; |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
414c70cb LG |
310 | static ssize_t regulator_uV_show(struct device *dev, |
311 | struct device_attribute *attr, char *buf) | |
312 | { | |
a5766f11 | 313 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
314 | ssize_t ret; |
315 | ||
316 | mutex_lock(&rdev->mutex); | |
317 | ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); | |
318 | mutex_unlock(&rdev->mutex); | |
319 | ||
320 | return ret; | |
321 | } | |
7ad68e2f | 322 | static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); |
414c70cb LG |
323 | |
324 | static ssize_t regulator_uA_show(struct device *dev, | |
325 | struct device_attribute *attr, char *buf) | |
326 | { | |
a5766f11 | 327 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
328 | |
329 | return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); | |
330 | } | |
7ad68e2f | 331 | static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); |
414c70cb | 332 | |
587cea27 GKH |
333 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
334 | char *buf) | |
bc558a60 MB |
335 | { |
336 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
bc558a60 | 337 | |
1083c393 | 338 | return sprintf(buf, "%s\n", rdev_get_name(rdev)); |
bc558a60 | 339 | } |
587cea27 | 340 | static DEVICE_ATTR_RO(name); |
bc558a60 | 341 | |
4fca9545 | 342 | static ssize_t regulator_print_opmode(char *buf, int mode) |
414c70cb | 343 | { |
414c70cb LG |
344 | switch (mode) { |
345 | case REGULATOR_MODE_FAST: | |
346 | return sprintf(buf, "fast\n"); | |
347 | case REGULATOR_MODE_NORMAL: | |
348 | return sprintf(buf, "normal\n"); | |
349 | case REGULATOR_MODE_IDLE: | |
350 | return sprintf(buf, "idle\n"); | |
351 | case REGULATOR_MODE_STANDBY: | |
352 | return sprintf(buf, "standby\n"); | |
353 | } | |
354 | return sprintf(buf, "unknown\n"); | |
355 | } | |
356 | ||
4fca9545 DB |
357 | static ssize_t regulator_opmode_show(struct device *dev, |
358 | struct device_attribute *attr, char *buf) | |
414c70cb | 359 | { |
a5766f11 | 360 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 361 | |
4fca9545 DB |
362 | return regulator_print_opmode(buf, _regulator_get_mode(rdev)); |
363 | } | |
7ad68e2f | 364 | static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); |
4fca9545 DB |
365 | |
366 | static ssize_t regulator_print_state(char *buf, int state) | |
367 | { | |
414c70cb LG |
368 | if (state > 0) |
369 | return sprintf(buf, "enabled\n"); | |
370 | else if (state == 0) | |
371 | return sprintf(buf, "disabled\n"); | |
372 | else | |
373 | return sprintf(buf, "unknown\n"); | |
374 | } | |
375 | ||
4fca9545 DB |
376 | static ssize_t regulator_state_show(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
379 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
9332546f MB |
380 | ssize_t ret; |
381 | ||
382 | mutex_lock(&rdev->mutex); | |
383 | ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); | |
384 | mutex_unlock(&rdev->mutex); | |
4fca9545 | 385 | |
9332546f | 386 | return ret; |
4fca9545 | 387 | } |
7ad68e2f | 388 | static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); |
4fca9545 | 389 | |
853116a1 DB |
390 | static ssize_t regulator_status_show(struct device *dev, |
391 | struct device_attribute *attr, char *buf) | |
392 | { | |
393 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
394 | int status; | |
395 | char *label; | |
396 | ||
397 | status = rdev->desc->ops->get_status(rdev); | |
398 | if (status < 0) | |
399 | return status; | |
400 | ||
401 | switch (status) { | |
402 | case REGULATOR_STATUS_OFF: | |
403 | label = "off"; | |
404 | break; | |
405 | case REGULATOR_STATUS_ON: | |
406 | label = "on"; | |
407 | break; | |
408 | case REGULATOR_STATUS_ERROR: | |
409 | label = "error"; | |
410 | break; | |
411 | case REGULATOR_STATUS_FAST: | |
412 | label = "fast"; | |
413 | break; | |
414 | case REGULATOR_STATUS_NORMAL: | |
415 | label = "normal"; | |
416 | break; | |
417 | case REGULATOR_STATUS_IDLE: | |
418 | label = "idle"; | |
419 | break; | |
420 | case REGULATOR_STATUS_STANDBY: | |
421 | label = "standby"; | |
422 | break; | |
f59c8f9f MB |
423 | case REGULATOR_STATUS_BYPASS: |
424 | label = "bypass"; | |
425 | break; | |
1beaf762 KG |
426 | case REGULATOR_STATUS_UNDEFINED: |
427 | label = "undefined"; | |
428 | break; | |
853116a1 DB |
429 | default: |
430 | return -ERANGE; | |
431 | } | |
432 | ||
433 | return sprintf(buf, "%s\n", label); | |
434 | } | |
435 | static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); | |
436 | ||
414c70cb LG |
437 | static ssize_t regulator_min_uA_show(struct device *dev, |
438 | struct device_attribute *attr, char *buf) | |
439 | { | |
a5766f11 | 440 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
441 | |
442 | if (!rdev->constraints) | |
443 | return sprintf(buf, "constraint not defined\n"); | |
444 | ||
445 | return sprintf(buf, "%d\n", rdev->constraints->min_uA); | |
446 | } | |
7ad68e2f | 447 | static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); |
414c70cb LG |
448 | |
449 | static ssize_t regulator_max_uA_show(struct device *dev, | |
450 | struct device_attribute *attr, char *buf) | |
451 | { | |
a5766f11 | 452 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
453 | |
454 | if (!rdev->constraints) | |
455 | return sprintf(buf, "constraint not defined\n"); | |
456 | ||
457 | return sprintf(buf, "%d\n", rdev->constraints->max_uA); | |
458 | } | |
7ad68e2f | 459 | static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); |
414c70cb LG |
460 | |
461 | static ssize_t regulator_min_uV_show(struct device *dev, | |
462 | struct device_attribute *attr, char *buf) | |
463 | { | |
a5766f11 | 464 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
465 | |
466 | if (!rdev->constraints) | |
467 | return sprintf(buf, "constraint not defined\n"); | |
468 | ||
469 | return sprintf(buf, "%d\n", rdev->constraints->min_uV); | |
470 | } | |
7ad68e2f | 471 | static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); |
414c70cb LG |
472 | |
473 | static ssize_t regulator_max_uV_show(struct device *dev, | |
474 | struct device_attribute *attr, char *buf) | |
475 | { | |
a5766f11 | 476 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
477 | |
478 | if (!rdev->constraints) | |
479 | return sprintf(buf, "constraint not defined\n"); | |
480 | ||
481 | return sprintf(buf, "%d\n", rdev->constraints->max_uV); | |
482 | } | |
7ad68e2f | 483 | static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); |
414c70cb LG |
484 | |
485 | static ssize_t regulator_total_uA_show(struct device *dev, | |
486 | struct device_attribute *attr, char *buf) | |
487 | { | |
a5766f11 | 488 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
489 | struct regulator *regulator; |
490 | int uA = 0; | |
491 | ||
492 | mutex_lock(&rdev->mutex); | |
493 | list_for_each_entry(regulator, &rdev->consumer_list, list) | |
fa2984d4 | 494 | uA += regulator->uA_load; |
414c70cb LG |
495 | mutex_unlock(&rdev->mutex); |
496 | return sprintf(buf, "%d\n", uA); | |
497 | } | |
7ad68e2f | 498 | static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); |
414c70cb | 499 | |
587cea27 GKH |
500 | static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, |
501 | char *buf) | |
414c70cb | 502 | { |
a5766f11 | 503 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
504 | return sprintf(buf, "%d\n", rdev->use_count); |
505 | } | |
587cea27 | 506 | static DEVICE_ATTR_RO(num_users); |
414c70cb | 507 | |
587cea27 GKH |
508 | static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
509 | char *buf) | |
414c70cb | 510 | { |
a5766f11 | 511 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb LG |
512 | |
513 | switch (rdev->desc->type) { | |
514 | case REGULATOR_VOLTAGE: | |
515 | return sprintf(buf, "voltage\n"); | |
516 | case REGULATOR_CURRENT: | |
517 | return sprintf(buf, "current\n"); | |
518 | } | |
519 | return sprintf(buf, "unknown\n"); | |
520 | } | |
587cea27 | 521 | static DEVICE_ATTR_RO(type); |
414c70cb LG |
522 | |
523 | static ssize_t regulator_suspend_mem_uV_show(struct device *dev, | |
524 | struct device_attribute *attr, char *buf) | |
525 | { | |
a5766f11 | 526 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 527 | |
414c70cb LG |
528 | return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); |
529 | } | |
7ad68e2f DB |
530 | static DEVICE_ATTR(suspend_mem_microvolts, 0444, |
531 | regulator_suspend_mem_uV_show, NULL); | |
414c70cb LG |
532 | |
533 | static ssize_t regulator_suspend_disk_uV_show(struct device *dev, | |
534 | struct device_attribute *attr, char *buf) | |
535 | { | |
a5766f11 | 536 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 537 | |
414c70cb LG |
538 | return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); |
539 | } | |
7ad68e2f DB |
540 | static DEVICE_ATTR(suspend_disk_microvolts, 0444, |
541 | regulator_suspend_disk_uV_show, NULL); | |
414c70cb LG |
542 | |
543 | static ssize_t regulator_suspend_standby_uV_show(struct device *dev, | |
544 | struct device_attribute *attr, char *buf) | |
545 | { | |
a5766f11 | 546 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 547 | |
414c70cb LG |
548 | return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); |
549 | } | |
7ad68e2f DB |
550 | static DEVICE_ATTR(suspend_standby_microvolts, 0444, |
551 | regulator_suspend_standby_uV_show, NULL); | |
414c70cb | 552 | |
414c70cb LG |
553 | static ssize_t regulator_suspend_mem_mode_show(struct device *dev, |
554 | struct device_attribute *attr, char *buf) | |
555 | { | |
a5766f11 | 556 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 557 | |
4fca9545 DB |
558 | return regulator_print_opmode(buf, |
559 | rdev->constraints->state_mem.mode); | |
414c70cb | 560 | } |
7ad68e2f DB |
561 | static DEVICE_ATTR(suspend_mem_mode, 0444, |
562 | regulator_suspend_mem_mode_show, NULL); | |
414c70cb LG |
563 | |
564 | static ssize_t regulator_suspend_disk_mode_show(struct device *dev, | |
565 | struct device_attribute *attr, char *buf) | |
566 | { | |
a5766f11 | 567 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 568 | |
4fca9545 DB |
569 | return regulator_print_opmode(buf, |
570 | rdev->constraints->state_disk.mode); | |
414c70cb | 571 | } |
7ad68e2f DB |
572 | static DEVICE_ATTR(suspend_disk_mode, 0444, |
573 | regulator_suspend_disk_mode_show, NULL); | |
414c70cb LG |
574 | |
575 | static ssize_t regulator_suspend_standby_mode_show(struct device *dev, | |
576 | struct device_attribute *attr, char *buf) | |
577 | { | |
a5766f11 | 578 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 579 | |
4fca9545 DB |
580 | return regulator_print_opmode(buf, |
581 | rdev->constraints->state_standby.mode); | |
414c70cb | 582 | } |
7ad68e2f DB |
583 | static DEVICE_ATTR(suspend_standby_mode, 0444, |
584 | regulator_suspend_standby_mode_show, NULL); | |
414c70cb LG |
585 | |
586 | static ssize_t regulator_suspend_mem_state_show(struct device *dev, | |
587 | struct device_attribute *attr, char *buf) | |
588 | { | |
a5766f11 | 589 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 590 | |
4fca9545 DB |
591 | return regulator_print_state(buf, |
592 | rdev->constraints->state_mem.enabled); | |
414c70cb | 593 | } |
7ad68e2f DB |
594 | static DEVICE_ATTR(suspend_mem_state, 0444, |
595 | regulator_suspend_mem_state_show, NULL); | |
414c70cb LG |
596 | |
597 | static ssize_t regulator_suspend_disk_state_show(struct device *dev, | |
598 | struct device_attribute *attr, char *buf) | |
599 | { | |
a5766f11 | 600 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 601 | |
4fca9545 DB |
602 | return regulator_print_state(buf, |
603 | rdev->constraints->state_disk.enabled); | |
414c70cb | 604 | } |
7ad68e2f DB |
605 | static DEVICE_ATTR(suspend_disk_state, 0444, |
606 | regulator_suspend_disk_state_show, NULL); | |
414c70cb LG |
607 | |
608 | static ssize_t regulator_suspend_standby_state_show(struct device *dev, | |
609 | struct device_attribute *attr, char *buf) | |
610 | { | |
a5766f11 | 611 | struct regulator_dev *rdev = dev_get_drvdata(dev); |
414c70cb | 612 | |
4fca9545 DB |
613 | return regulator_print_state(buf, |
614 | rdev->constraints->state_standby.enabled); | |
414c70cb | 615 | } |
7ad68e2f DB |
616 | static DEVICE_ATTR(suspend_standby_state, 0444, |
617 | regulator_suspend_standby_state_show, NULL); | |
618 | ||
f59c8f9f MB |
619 | static ssize_t regulator_bypass_show(struct device *dev, |
620 | struct device_attribute *attr, char *buf) | |
621 | { | |
622 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
623 | const char *report; | |
624 | bool bypass; | |
625 | int ret; | |
626 | ||
627 | ret = rdev->desc->ops->get_bypass(rdev, &bypass); | |
628 | ||
629 | if (ret != 0) | |
630 | report = "unknown"; | |
631 | else if (bypass) | |
632 | report = "enabled"; | |
633 | else | |
634 | report = "disabled"; | |
635 | ||
636 | return sprintf(buf, "%s\n", report); | |
637 | } | |
638 | static DEVICE_ATTR(bypass, 0444, | |
639 | regulator_bypass_show, NULL); | |
bc558a60 | 640 | |
414c70cb LG |
641 | /* Calculate the new optimum regulator operating mode based on the new total |
642 | * consumer load. All locks held by caller */ | |
8460ef38 | 643 | static int drms_uA_update(struct regulator_dev *rdev) |
414c70cb LG |
644 | { |
645 | struct regulator *sibling; | |
646 | int current_uA = 0, output_uV, input_uV, err; | |
647 | unsigned int mode; | |
648 | ||
70cfef26 KK |
649 | lockdep_assert_held_once(&rdev->mutex); |
650 | ||
8460ef38 BA |
651 | /* |
652 | * first check to see if we can set modes at all, otherwise just | |
653 | * tell the consumer everything is OK. | |
654 | */ | |
414c70cb | 655 | err = regulator_check_drms(rdev); |
8460ef38 BA |
656 | if (err < 0) |
657 | return 0; | |
658 | ||
8f4490e0 BA |
659 | if (!rdev->desc->ops->get_optimum_mode && |
660 | !rdev->desc->ops->set_load) | |
8460ef38 BA |
661 | return 0; |
662 | ||
8f4490e0 BA |
663 | if (!rdev->desc->ops->set_mode && |
664 | !rdev->desc->ops->set_load) | |
8460ef38 | 665 | return -EINVAL; |
414c70cb LG |
666 | |
667 | /* get output voltage */ | |
1bf5a1f8 | 668 | output_uV = _regulator_get_voltage(rdev); |
8460ef38 BA |
669 | if (output_uV <= 0) { |
670 | rdev_err(rdev, "invalid output voltage found\n"); | |
671 | return -EINVAL; | |
672 | } | |
414c70cb LG |
673 | |
674 | /* get input voltage */ | |
1bf5a1f8 MB |
675 | input_uV = 0; |
676 | if (rdev->supply) | |
3f24f5ad | 677 | input_uV = regulator_get_voltage(rdev->supply); |
1bf5a1f8 | 678 | if (input_uV <= 0) |
414c70cb | 679 | input_uV = rdev->constraints->input_uV; |
8460ef38 BA |
680 | if (input_uV <= 0) { |
681 | rdev_err(rdev, "invalid input voltage found\n"); | |
682 | return -EINVAL; | |
683 | } | |
414c70cb LG |
684 | |
685 | /* calc total requested load */ | |
686 | list_for_each_entry(sibling, &rdev->consumer_list, list) | |
fa2984d4 | 687 | current_uA += sibling->uA_load; |
414c70cb | 688 | |
22a10bca SB |
689 | current_uA += rdev->constraints->system_load; |
690 | ||
8f4490e0 BA |
691 | if (rdev->desc->ops->set_load) { |
692 | /* set the optimum mode for our new total regulator load */ | |
693 | err = rdev->desc->ops->set_load(rdev, current_uA); | |
694 | if (err < 0) | |
695 | rdev_err(rdev, "failed to set load %d\n", current_uA); | |
696 | } else { | |
697 | /* now get the optimum mode for our new total regulator load */ | |
698 | mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, | |
699 | output_uV, current_uA); | |
700 | ||
701 | /* check the new mode is allowed */ | |
702 | err = regulator_mode_constrain(rdev, &mode); | |
703 | if (err < 0) { | |
704 | rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", | |
705 | current_uA, input_uV, output_uV); | |
706 | return err; | |
707 | } | |
414c70cb | 708 | |
8f4490e0 BA |
709 | err = rdev->desc->ops->set_mode(rdev, mode); |
710 | if (err < 0) | |
711 | rdev_err(rdev, "failed to set optimum mode %x\n", mode); | |
8460ef38 BA |
712 | } |
713 | ||
8460ef38 | 714 | return err; |
414c70cb LG |
715 | } |
716 | ||
717 | static int suspend_set_state(struct regulator_dev *rdev, | |
718 | struct regulator_state *rstate) | |
719 | { | |
720 | int ret = 0; | |
638f85c5 MB |
721 | |
722 | /* If we have no suspend mode configration don't set anything; | |
8ac0e95d AL |
723 | * only warn if the driver implements set_suspend_voltage or |
724 | * set_suspend_mode callback. | |
638f85c5 MB |
725 | */ |
726 | if (!rstate->enabled && !rstate->disabled) { | |
8ac0e95d AL |
727 | if (rdev->desc->ops->set_suspend_voltage || |
728 | rdev->desc->ops->set_suspend_mode) | |
5da84fd9 | 729 | rdev_warn(rdev, "No configuration\n"); |
638f85c5 MB |
730 | return 0; |
731 | } | |
732 | ||
733 | if (rstate->enabled && rstate->disabled) { | |
5da84fd9 | 734 | rdev_err(rdev, "invalid configuration\n"); |
638f85c5 MB |
735 | return -EINVAL; |
736 | } | |
414c70cb | 737 | |
8ac0e95d | 738 | if (rstate->enabled && rdev->desc->ops->set_suspend_enable) |
414c70cb | 739 | ret = rdev->desc->ops->set_suspend_enable(rdev); |
8ac0e95d | 740 | else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) |
414c70cb | 741 | ret = rdev->desc->ops->set_suspend_disable(rdev); |
8ac0e95d AL |
742 | else /* OK if set_suspend_enable or set_suspend_disable is NULL */ |
743 | ret = 0; | |
744 | ||
414c70cb | 745 | if (ret < 0) { |
5da84fd9 | 746 | rdev_err(rdev, "failed to enabled/disable\n"); |
414c70cb LG |
747 | return ret; |
748 | } | |
749 | ||
750 | if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { | |
751 | ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); | |
752 | if (ret < 0) { | |
5da84fd9 | 753 | rdev_err(rdev, "failed to set voltage\n"); |
414c70cb LG |
754 | return ret; |
755 | } | |
756 | } | |
757 | ||
758 | if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { | |
759 | ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); | |
760 | if (ret < 0) { | |
5da84fd9 | 761 | rdev_err(rdev, "failed to set mode\n"); |
414c70cb LG |
762 | return ret; |
763 | } | |
764 | } | |
765 | return ret; | |
766 | } | |
767 | ||
768 | /* locks held by caller */ | |
769 | static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) | |
770 | { | |
70cfef26 KK |
771 | lockdep_assert_held_once(&rdev->mutex); |
772 | ||
414c70cb LG |
773 | if (!rdev->constraints) |
774 | return -EINVAL; | |
775 | ||
776 | switch (state) { | |
777 | case PM_SUSPEND_STANDBY: | |
778 | return suspend_set_state(rdev, | |
779 | &rdev->constraints->state_standby); | |
780 | case PM_SUSPEND_MEM: | |
781 | return suspend_set_state(rdev, | |
782 | &rdev->constraints->state_mem); | |
783 | case PM_SUSPEND_MAX: | |
784 | return suspend_set_state(rdev, | |
785 | &rdev->constraints->state_disk); | |
786 | default: | |
787 | return -EINVAL; | |
788 | } | |
789 | } | |
790 | ||
791 | static void print_constraints(struct regulator_dev *rdev) | |
792 | { | |
793 | struct regulation_constraints *constraints = rdev->constraints; | |
a7068e39 | 794 | char buf[160] = ""; |
5751a99f | 795 | size_t len = sizeof(buf) - 1; |
8f031b48 MB |
796 | int count = 0; |
797 | int ret; | |
414c70cb | 798 | |
8f031b48 | 799 | if (constraints->min_uV && constraints->max_uV) { |
414c70cb | 800 | if (constraints->min_uV == constraints->max_uV) |
5751a99f SW |
801 | count += scnprintf(buf + count, len - count, "%d mV ", |
802 | constraints->min_uV / 1000); | |
414c70cb | 803 | else |
5751a99f SW |
804 | count += scnprintf(buf + count, len - count, |
805 | "%d <--> %d mV ", | |
806 | constraints->min_uV / 1000, | |
807 | constraints->max_uV / 1000); | |
8f031b48 MB |
808 | } |
809 | ||
810 | if (!constraints->min_uV || | |
811 | constraints->min_uV != constraints->max_uV) { | |
812 | ret = _regulator_get_voltage(rdev); | |
813 | if (ret > 0) | |
5751a99f SW |
814 | count += scnprintf(buf + count, len - count, |
815 | "at %d mV ", ret / 1000); | |
8f031b48 MB |
816 | } |
817 | ||
bf5892a8 | 818 | if (constraints->uV_offset) |
5751a99f SW |
819 | count += scnprintf(buf + count, len - count, "%dmV offset ", |
820 | constraints->uV_offset / 1000); | |
bf5892a8 | 821 | |
8f031b48 | 822 | if (constraints->min_uA && constraints->max_uA) { |
414c70cb | 823 | if (constraints->min_uA == constraints->max_uA) |
5751a99f SW |
824 | count += scnprintf(buf + count, len - count, "%d mA ", |
825 | constraints->min_uA / 1000); | |
414c70cb | 826 | else |
5751a99f SW |
827 | count += scnprintf(buf + count, len - count, |
828 | "%d <--> %d mA ", | |
829 | constraints->min_uA / 1000, | |
830 | constraints->max_uA / 1000); | |
8f031b48 MB |
831 | } |
832 | ||
833 | if (!constraints->min_uA || | |
834 | constraints->min_uA != constraints->max_uA) { | |
835 | ret = _regulator_get_current_limit(rdev); | |
836 | if (ret > 0) | |
5751a99f SW |
837 | count += scnprintf(buf + count, len - count, |
838 | "at %d mA ", ret / 1000); | |
414c70cb | 839 | } |
8f031b48 | 840 | |
414c70cb | 841 | if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) |
5751a99f | 842 | count += scnprintf(buf + count, len - count, "fast "); |
414c70cb | 843 | if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) |
5751a99f | 844 | count += scnprintf(buf + count, len - count, "normal "); |
414c70cb | 845 | if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) |
5751a99f | 846 | count += scnprintf(buf + count, len - count, "idle "); |
414c70cb | 847 | if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) |
5751a99f | 848 | count += scnprintf(buf + count, len - count, "standby"); |
414c70cb | 849 | |
215b8b05 | 850 | if (!count) |
5751a99f | 851 | scnprintf(buf, len, "no parameters"); |
215b8b05 | 852 | |
194dbaef | 853 | rdev_dbg(rdev, "%s\n", buf); |
4a682922 MB |
854 | |
855 | if ((constraints->min_uV != constraints->max_uV) && | |
856 | !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) | |
857 | rdev_warn(rdev, | |
858 | "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); | |
414c70cb LG |
859 | } |
860 | ||
e79055d6 | 861 | static int machine_constraints_voltage(struct regulator_dev *rdev, |
1083c393 | 862 | struct regulation_constraints *constraints) |
a5766f11 | 863 | { |
272e2315 | 864 | const struct regulator_ops *ops = rdev->desc->ops; |
af5866c9 MB |
865 | int ret; |
866 | ||
867 | /* do we need to apply the constraint voltage */ | |
868 | if (rdev->constraints->apply_uV && | |
75790251 | 869 | rdev->constraints->min_uV == rdev->constraints->max_uV) { |
064d5cd1 AB |
870 | int current_uV = _regulator_get_voltage(rdev); |
871 | if (current_uV < 0) { | |
69d58839 NM |
872 | rdev_err(rdev, |
873 | "failed to get the current voltage(%d)\n", | |
874 | current_uV); | |
064d5cd1 AB |
875 | return current_uV; |
876 | } | |
877 | if (current_uV < rdev->constraints->min_uV || | |
878 | current_uV > rdev->constraints->max_uV) { | |
879 | ret = _regulator_do_set_voltage( | |
880 | rdev, rdev->constraints->min_uV, | |
881 | rdev->constraints->max_uV); | |
882 | if (ret < 0) { | |
883 | rdev_err(rdev, | |
69d58839 NM |
884 | "failed to apply %duV constraint(%d)\n", |
885 | rdev->constraints->min_uV, ret); | |
064d5cd1 AB |
886 | return ret; |
887 | } | |
75790251 | 888 | } |
af5866c9 | 889 | } |
e06f5b4f | 890 | |
4367cfdc DB |
891 | /* constrain machine-level voltage specs to fit |
892 | * the actual range supported by this regulator. | |
893 | */ | |
894 | if (ops->list_voltage && rdev->desc->n_voltages) { | |
895 | int count = rdev->desc->n_voltages; | |
896 | int i; | |
897 | int min_uV = INT_MAX; | |
898 | int max_uV = INT_MIN; | |
899 | int cmin = constraints->min_uV; | |
900 | int cmax = constraints->max_uV; | |
901 | ||
3e590918 MB |
902 | /* it's safe to autoconfigure fixed-voltage supplies |
903 | and the constraints are used by list_voltage. */ | |
4367cfdc | 904 | if (count == 1 && !cmin) { |
3e590918 | 905 | cmin = 1; |
4367cfdc | 906 | cmax = INT_MAX; |
3e590918 MB |
907 | constraints->min_uV = cmin; |
908 | constraints->max_uV = cmax; | |
4367cfdc DB |
909 | } |
910 | ||
3e2b9abd MB |
911 | /* voltage constraints are optional */ |
912 | if ((cmin == 0) && (cmax == 0)) | |
e79055d6 | 913 | return 0; |
3e2b9abd | 914 | |
4367cfdc | 915 | /* else require explicit machine-level constraints */ |
3e2b9abd | 916 | if (cmin <= 0 || cmax <= 0 || cmax < cmin) { |
5da84fd9 | 917 | rdev_err(rdev, "invalid voltage constraints\n"); |
e79055d6 | 918 | return -EINVAL; |
4367cfdc DB |
919 | } |
920 | ||
921 | /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ | |
922 | for (i = 0; i < count; i++) { | |
923 | int value; | |
924 | ||
925 | value = ops->list_voltage(rdev, i); | |
926 | if (value <= 0) | |
927 | continue; | |
928 | ||
929 | /* maybe adjust [min_uV..max_uV] */ | |
930 | if (value >= cmin && value < min_uV) | |
931 | min_uV = value; | |
932 | if (value <= cmax && value > max_uV) | |
933 | max_uV = value; | |
934 | } | |
935 | ||
936 | /* final: [min_uV..max_uV] valid iff constraints valid */ | |
937 | if (max_uV < min_uV) { | |
fff15bef MB |
938 | rdev_err(rdev, |
939 | "unsupportable voltage constraints %u-%uuV\n", | |
940 | min_uV, max_uV); | |
e79055d6 | 941 | return -EINVAL; |
4367cfdc DB |
942 | } |
943 | ||
944 | /* use regulator's subset of machine constraints */ | |
945 | if (constraints->min_uV < min_uV) { | |
5da84fd9 JP |
946 | rdev_dbg(rdev, "override min_uV, %d -> %d\n", |
947 | constraints->min_uV, min_uV); | |
4367cfdc DB |
948 | constraints->min_uV = min_uV; |
949 | } | |
950 | if (constraints->max_uV > max_uV) { | |
5da84fd9 JP |
951 | rdev_dbg(rdev, "override max_uV, %d -> %d\n", |
952 | constraints->max_uV, max_uV); | |
4367cfdc DB |
953 | constraints->max_uV = max_uV; |
954 | } | |
955 | } | |
956 | ||
e79055d6 MB |
957 | return 0; |
958 | } | |
959 | ||
f8c1700d LD |
960 | static int machine_constraints_current(struct regulator_dev *rdev, |
961 | struct regulation_constraints *constraints) | |
962 | { | |
272e2315 | 963 | const struct regulator_ops *ops = rdev->desc->ops; |
f8c1700d LD |
964 | int ret; |
965 | ||
966 | if (!constraints->min_uA && !constraints->max_uA) | |
967 | return 0; | |
968 | ||
969 | if (constraints->min_uA > constraints->max_uA) { | |
970 | rdev_err(rdev, "Invalid current constraints\n"); | |
971 | return -EINVAL; | |
972 | } | |
973 | ||
974 | if (!ops->set_current_limit || !ops->get_current_limit) { | |
975 | rdev_warn(rdev, "Operation of current configuration missing\n"); | |
976 | return 0; | |
977 | } | |
978 | ||
979 | /* Set regulator current in constraints range */ | |
980 | ret = ops->set_current_limit(rdev, constraints->min_uA, | |
981 | constraints->max_uA); | |
982 | if (ret < 0) { | |
983 | rdev_err(rdev, "Failed to set current constraint, %d\n", ret); | |
984 | return ret; | |
985 | } | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
30c21971 MP |
990 | static int _regulator_do_enable(struct regulator_dev *rdev); |
991 | ||
e79055d6 MB |
992 | /** |
993 | * set_machine_constraints - sets regulator constraints | |
994 | * @rdev: regulator source | |
995 | * @constraints: constraints to apply | |
996 | * | |
997 | * Allows platform initialisation code to define and constrain | |
998 | * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: | |
999 | * Constraints *must* be set by platform code in order for some | |
1000 | * regulator operations to proceed i.e. set_voltage, set_current_limit, | |
1001 | * set_mode. | |
1002 | */ | |
1003 | static int set_machine_constraints(struct regulator_dev *rdev, | |
f8c12fe3 | 1004 | const struct regulation_constraints *constraints) |
e79055d6 MB |
1005 | { |
1006 | int ret = 0; | |
272e2315 | 1007 | const struct regulator_ops *ops = rdev->desc->ops; |
e79055d6 | 1008 | |
9a8f5e07 MB |
1009 | if (constraints) |
1010 | rdev->constraints = kmemdup(constraints, sizeof(*constraints), | |
1011 | GFP_KERNEL); | |
1012 | else | |
1013 | rdev->constraints = kzalloc(sizeof(*constraints), | |
1014 | GFP_KERNEL); | |
f8c12fe3 MB |
1015 | if (!rdev->constraints) |
1016 | return -ENOMEM; | |
af5866c9 | 1017 | |
f8c12fe3 | 1018 | ret = machine_constraints_voltage(rdev, rdev->constraints); |
e79055d6 MB |
1019 | if (ret != 0) |
1020 | goto out; | |
1021 | ||
f8c1700d | 1022 | ret = machine_constraints_current(rdev, rdev->constraints); |
e79055d6 MB |
1023 | if (ret != 0) |
1024 | goto out; | |
1025 | ||
36e4f839 SB |
1026 | if (rdev->constraints->ilim_uA && ops->set_input_current_limit) { |
1027 | ret = ops->set_input_current_limit(rdev, | |
1028 | rdev->constraints->ilim_uA); | |
1029 | if (ret < 0) { | |
1030 | rdev_err(rdev, "failed to set input limit\n"); | |
1031 | goto out; | |
1032 | } | |
1033 | } | |
1034 | ||
a5766f11 | 1035 | /* do we need to setup our suspend state */ |
9a8f5e07 | 1036 | if (rdev->constraints->initial_state) { |
f8c12fe3 | 1037 | ret = suspend_prepare(rdev, rdev->constraints->initial_state); |
e06f5b4f | 1038 | if (ret < 0) { |
5da84fd9 | 1039 | rdev_err(rdev, "failed to set suspend state\n"); |
e06f5b4f MB |
1040 | goto out; |
1041 | } | |
1042 | } | |
a5766f11 | 1043 | |
9a8f5e07 | 1044 | if (rdev->constraints->initial_mode) { |
a308466c | 1045 | if (!ops->set_mode) { |
5da84fd9 | 1046 | rdev_err(rdev, "no set_mode operation\n"); |
a308466c MB |
1047 | ret = -EINVAL; |
1048 | goto out; | |
1049 | } | |
1050 | ||
f8c12fe3 | 1051 | ret = ops->set_mode(rdev, rdev->constraints->initial_mode); |
a308466c | 1052 | if (ret < 0) { |
5da84fd9 | 1053 | rdev_err(rdev, "failed to set initial mode: %d\n", ret); |
a308466c MB |
1054 | goto out; |
1055 | } | |
1056 | } | |
1057 | ||
cacf90f2 MB |
1058 | /* If the constraints say the regulator should be on at this point |
1059 | * and we have control then make sure it is enabled. | |
1060 | */ | |
30c21971 MP |
1061 | if (rdev->constraints->always_on || rdev->constraints->boot_on) { |
1062 | ret = _regulator_do_enable(rdev); | |
1063 | if (ret < 0 && ret != -EINVAL) { | |
5da84fd9 | 1064 | rdev_err(rdev, "failed to enable\n"); |
e5fda26c MB |
1065 | goto out; |
1066 | } | |
1067 | } | |
1068 | ||
1653ccf4 YSB |
1069 | if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) |
1070 | && ops->set_ramp_delay) { | |
6f0b2c69 YSB |
1071 | ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); |
1072 | if (ret < 0) { | |
1073 | rdev_err(rdev, "failed to set ramp_delay\n"); | |
1074 | goto out; | |
1075 | } | |
1076 | } | |
1077 | ||
23c779b9 SB |
1078 | if (rdev->constraints->pull_down && ops->set_pull_down) { |
1079 | ret = ops->set_pull_down(rdev); | |
1080 | if (ret < 0) { | |
1081 | rdev_err(rdev, "failed to set pull down\n"); | |
1082 | goto out; | |
1083 | } | |
1084 | } | |
1085 | ||
57f66b78 SB |
1086 | if (rdev->constraints->soft_start && ops->set_soft_start) { |
1087 | ret = ops->set_soft_start(rdev); | |
1088 | if (ret < 0) { | |
1089 | rdev_err(rdev, "failed to set soft start\n"); | |
1090 | goto out; | |
1091 | } | |
1092 | } | |
1093 | ||
3a003bae SB |
1094 | if (rdev->constraints->over_current_protection |
1095 | && ops->set_over_current_protection) { | |
1096 | ret = ops->set_over_current_protection(rdev); | |
1097 | if (ret < 0) { | |
1098 | rdev_err(rdev, "failed to set over current protection\n"); | |
1099 | goto out; | |
1100 | } | |
1101 | } | |
1102 | ||
a5766f11 | 1103 | print_constraints(rdev); |
1a6958e7 | 1104 | return 0; |
a5766f11 | 1105 | out: |
1a6958e7 AL |
1106 | kfree(rdev->constraints); |
1107 | rdev->constraints = NULL; | |
a5766f11 LG |
1108 | return ret; |
1109 | } | |
1110 | ||
1111 | /** | |
1112 | * set_supply - set regulator supply regulator | |
69279fb9 MB |
1113 | * @rdev: regulator name |
1114 | * @supply_rdev: supply regulator name | |
a5766f11 LG |
1115 | * |
1116 | * Called by platform initialisation code to set the supply regulator for this | |
1117 | * regulator. This ensures that a regulators supply will also be enabled by the | |
1118 | * core if it's child is enabled. | |
1119 | */ | |
1120 | static int set_supply(struct regulator_dev *rdev, | |
3801b86a | 1121 | struct regulator_dev *supply_rdev) |
a5766f11 LG |
1122 | { |
1123 | int err; | |
1124 | ||
3801b86a MB |
1125 | rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); |
1126 | ||
e2c09ae7 JMC |
1127 | if (!try_module_get(supply_rdev->owner)) |
1128 | return -ENODEV; | |
1129 | ||
3801b86a | 1130 | rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); |
32c78de8 AL |
1131 | if (rdev->supply == NULL) { |
1132 | err = -ENOMEM; | |
3801b86a | 1133 | return err; |
a5766f11 | 1134 | } |
57ad526a | 1135 | supply_rdev->open_count++; |
3801b86a MB |
1136 | |
1137 | return 0; | |
a5766f11 LG |
1138 | } |
1139 | ||
1140 | /** | |
06c63f93 | 1141 | * set_consumer_device_supply - Bind a regulator to a symbolic supply |
69279fb9 | 1142 | * @rdev: regulator source |
40f9244f | 1143 | * @consumer_dev_name: dev_name() string for device supply applies to |
69279fb9 | 1144 | * @supply: symbolic name for supply |
a5766f11 LG |
1145 | * |
1146 | * Allows platform initialisation code to map physical regulator | |
1147 | * sources to symbolic names for supplies for use by devices. Devices | |
1148 | * should use these symbolic names to request regulators, avoiding the | |
1149 | * need to provide board-specific regulator names as platform data. | |
1150 | */ | |
1151 | static int set_consumer_device_supply(struct regulator_dev *rdev, | |
737f360d MB |
1152 | const char *consumer_dev_name, |
1153 | const char *supply) | |
a5766f11 LG |
1154 | { |
1155 | struct regulator_map *node; | |
9ed2099e | 1156 | int has_dev; |
a5766f11 LG |
1157 | |
1158 | if (supply == NULL) | |
1159 | return -EINVAL; | |
1160 | ||
9ed2099e MB |
1161 | if (consumer_dev_name != NULL) |
1162 | has_dev = 1; | |
1163 | else | |
1164 | has_dev = 0; | |
1165 | ||
6001e13c | 1166 | list_for_each_entry(node, ®ulator_map_list, list) { |
23b5cc2a JN |
1167 | if (node->dev_name && consumer_dev_name) { |
1168 | if (strcmp(node->dev_name, consumer_dev_name) != 0) | |
1169 | continue; | |
1170 | } else if (node->dev_name || consumer_dev_name) { | |
6001e13c | 1171 | continue; |
23b5cc2a JN |
1172 | } |
1173 | ||
6001e13c DB |
1174 | if (strcmp(node->supply, supply) != 0) |
1175 | continue; | |
1176 | ||
737f360d MB |
1177 | pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", |
1178 | consumer_dev_name, | |
1179 | dev_name(&node->regulator->dev), | |
1180 | node->regulator->desc->name, | |
1181 | supply, | |
1182 | dev_name(&rdev->dev), rdev_get_name(rdev)); | |
6001e13c DB |
1183 | return -EBUSY; |
1184 | } | |
1185 | ||
9ed2099e | 1186 | node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); |
a5766f11 LG |
1187 | if (node == NULL) |
1188 | return -ENOMEM; | |
1189 | ||
1190 | node->regulator = rdev; | |
a5766f11 LG |
1191 | node->supply = supply; |
1192 | ||
9ed2099e MB |
1193 | if (has_dev) { |
1194 | node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); | |
1195 | if (node->dev_name == NULL) { | |
1196 | kfree(node); | |
1197 | return -ENOMEM; | |
1198 | } | |
40f9244f MB |
1199 | } |
1200 | ||
a5766f11 LG |
1201 | list_add(&node->list, ®ulator_map_list); |
1202 | return 0; | |
1203 | } | |
1204 | ||
0f1d747b MR |
1205 | static void unset_regulator_supplies(struct regulator_dev *rdev) |
1206 | { | |
1207 | struct regulator_map *node, *n; | |
1208 | ||
1209 | list_for_each_entry_safe(node, n, ®ulator_map_list, list) { | |
1210 | if (rdev == node->regulator) { | |
1211 | list_del(&node->list); | |
40f9244f | 1212 | kfree(node->dev_name); |
0f1d747b | 1213 | kfree(node); |
0f1d747b MR |
1214 | } |
1215 | } | |
1216 | } | |
1217 | ||
f5726ae3 | 1218 | #define REG_STR_SIZE 64 |
414c70cb LG |
1219 | |
1220 | static struct regulator *create_regulator(struct regulator_dev *rdev, | |
1221 | struct device *dev, | |
1222 | const char *supply_name) | |
1223 | { | |
1224 | struct regulator *regulator; | |
1225 | char buf[REG_STR_SIZE]; | |
1226 | int err, size; | |
1227 | ||
1228 | regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); | |
1229 | if (regulator == NULL) | |
1230 | return NULL; | |
1231 | ||
1232 | mutex_lock(&rdev->mutex); | |
1233 | regulator->rdev = rdev; | |
1234 | list_add(®ulator->list, &rdev->consumer_list); | |
1235 | ||
1236 | if (dev) { | |
e2c98eaf SG |
1237 | regulator->dev = dev; |
1238 | ||
222cc7b1 | 1239 | /* Add a link to the device sysfs entry */ |
414c70cb LG |
1240 | size = scnprintf(buf, REG_STR_SIZE, "%s-%s", |
1241 | dev->kobj.name, supply_name); | |
1242 | if (size >= REG_STR_SIZE) | |
222cc7b1 | 1243 | goto overflow_err; |
414c70cb LG |
1244 | |
1245 | regulator->supply_name = kstrdup(buf, GFP_KERNEL); | |
1246 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1247 | goto overflow_err; |
414c70cb | 1248 | |
ff268b56 | 1249 | err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj, |
414c70cb LG |
1250 | buf); |
1251 | if (err) { | |
ff268b56 | 1252 | rdev_dbg(rdev, "could not add device link %s err %d\n", |
5da84fd9 | 1253 | dev->kobj.name, err); |
222cc7b1 | 1254 | /* non-fatal */ |
414c70cb | 1255 | } |
5de70519 MB |
1256 | } else { |
1257 | regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); | |
1258 | if (regulator->supply_name == NULL) | |
222cc7b1 | 1259 | goto overflow_err; |
5de70519 MB |
1260 | } |
1261 | ||
5de70519 MB |
1262 | regulator->debugfs = debugfs_create_dir(regulator->supply_name, |
1263 | rdev->debugfs); | |
24751434 | 1264 | if (!regulator->debugfs) { |
5de70519 | 1265 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
5de70519 MB |
1266 | } else { |
1267 | debugfs_create_u32("uA_load", 0444, regulator->debugfs, | |
1268 | ®ulator->uA_load); | |
1269 | debugfs_create_u32("min_uV", 0444, regulator->debugfs, | |
1270 | ®ulator->min_uV); | |
1271 | debugfs_create_u32("max_uV", 0444, regulator->debugfs, | |
1272 | ®ulator->max_uV); | |
414c70cb | 1273 | } |
5de70519 | 1274 | |
6492bc1b MB |
1275 | /* |
1276 | * Check now if the regulator is an always on regulator - if | |
1277 | * it is then we don't need to do nearly so much work for | |
1278 | * enable/disable calls. | |
1279 | */ | |
1280 | if (!_regulator_can_change_status(rdev) && | |
1281 | _regulator_is_enabled(rdev)) | |
1282 | regulator->always_on = true; | |
1283 | ||
414c70cb LG |
1284 | mutex_unlock(&rdev->mutex); |
1285 | return regulator; | |
414c70cb LG |
1286 | overflow_err: |
1287 | list_del(®ulator->list); | |
1288 | kfree(regulator); | |
1289 | mutex_unlock(&rdev->mutex); | |
1290 | return NULL; | |
1291 | } | |
1292 | ||
31aae2be MB |
1293 | static int _regulator_get_enable_time(struct regulator_dev *rdev) |
1294 | { | |
00c877c6 LD |
1295 | if (rdev->constraints && rdev->constraints->enable_time) |
1296 | return rdev->constraints->enable_time; | |
31aae2be | 1297 | if (!rdev->desc->ops->enable_time) |
79511ed3 | 1298 | return rdev->desc->enable_time; |
31aae2be MB |
1299 | return rdev->desc->ops->enable_time(rdev); |
1300 | } | |
1301 | ||
a06ccd9c CK |
1302 | static struct regulator_supply_alias *regulator_find_supply_alias( |
1303 | struct device *dev, const char *supply) | |
1304 | { | |
1305 | struct regulator_supply_alias *map; | |
1306 | ||
1307 | list_for_each_entry(map, ®ulator_supply_alias_list, list) | |
1308 | if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) | |
1309 | return map; | |
1310 | ||
1311 | return NULL; | |
1312 | } | |
1313 | ||
1314 | static void regulator_supply_alias(struct device **dev, const char **supply) | |
1315 | { | |
1316 | struct regulator_supply_alias *map; | |
1317 | ||
1318 | map = regulator_find_supply_alias(*dev, *supply); | |
1319 | if (map) { | |
1320 | dev_dbg(*dev, "Mapping supply %s to %s,%s\n", | |
1321 | *supply, map->alias_supply, | |
1322 | dev_name(map->alias_dev)); | |
1323 | *dev = map->alias_dev; | |
1324 | *supply = map->alias_supply; | |
1325 | } | |
1326 | } | |
1327 | ||
69511a45 | 1328 | static struct regulator_dev *regulator_dev_lookup(struct device *dev, |
6d191a5f MB |
1329 | const char *supply, |
1330 | int *ret) | |
69511a45 RN |
1331 | { |
1332 | struct regulator_dev *r; | |
1333 | struct device_node *node; | |
576ca436 MB |
1334 | struct regulator_map *map; |
1335 | const char *devname = NULL; | |
69511a45 | 1336 | |
a06ccd9c CK |
1337 | regulator_supply_alias(&dev, &supply); |
1338 | ||
69511a45 RN |
1339 | /* first do a dt based lookup */ |
1340 | if (dev && dev->of_node) { | |
1341 | node = of_get_regulator(dev, supply); | |
6d191a5f | 1342 | if (node) { |
69511a45 RN |
1343 | list_for_each_entry(r, ®ulator_list, list) |
1344 | if (r->dev.parent && | |
1345 | node == r->dev.of_node) | |
1346 | return r; | |
317b5684 MB |
1347 | *ret = -EPROBE_DEFER; |
1348 | return NULL; | |
6d191a5f MB |
1349 | } else { |
1350 | /* | |
1351 | * If we couldn't even get the node then it's | |
1352 | * not just that the device didn't register | |
1353 | * yet, there's no node and we'll never | |
1354 | * succeed. | |
1355 | */ | |
1356 | *ret = -ENODEV; | |
1357 | } | |
69511a45 RN |
1358 | } |
1359 | ||
1360 | /* if not found, try doing it non-dt way */ | |
576ca436 MB |
1361 | if (dev) |
1362 | devname = dev_name(dev); | |
1363 | ||
69511a45 RN |
1364 | list_for_each_entry(r, ®ulator_list, list) |
1365 | if (strcmp(rdev_get_name(r), supply) == 0) | |
1366 | return r; | |
1367 | ||
576ca436 MB |
1368 | list_for_each_entry(map, ®ulator_map_list, list) { |
1369 | /* If the mapping has a device set up it must match */ | |
1370 | if (map->dev_name && | |
1371 | (!devname || strcmp(map->dev_name, devname))) | |
1372 | continue; | |
1373 | ||
1374 | if (strcmp(map->supply, supply) == 0) | |
1375 | return map->regulator; | |
1376 | } | |
1377 | ||
1378 | ||
69511a45 RN |
1379 | return NULL; |
1380 | } | |
1381 | ||
6261b06d BA |
1382 | static int regulator_resolve_supply(struct regulator_dev *rdev) |
1383 | { | |
1384 | struct regulator_dev *r; | |
1385 | struct device *dev = rdev->dev.parent; | |
1386 | int ret; | |
1387 | ||
1388 | /* No supply to resovle? */ | |
1389 | if (!rdev->supply_name) | |
1390 | return 0; | |
1391 | ||
1392 | /* Supply already resolved? */ | |
1393 | if (rdev->supply) | |
1394 | return 0; | |
1395 | ||
1396 | r = regulator_dev_lookup(dev, rdev->supply_name, &ret); | |
1397 | if (ret == -ENODEV) { | |
1398 | /* | |
1399 | * No supply was specified for this regulator and | |
1400 | * there will never be one. | |
1401 | */ | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | if (!r) { | |
9f7e25ed MB |
1406 | if (have_full_constraints()) { |
1407 | r = dummy_regulator_rdev; | |
1408 | } else { | |
1409 | dev_err(dev, "Failed to resolve %s-supply for %s\n", | |
1410 | rdev->supply_name, rdev->desc->name); | |
1411 | return -EPROBE_DEFER; | |
1412 | } | |
6261b06d BA |
1413 | } |
1414 | ||
1415 | /* Recursively resolve the supply of the supply */ | |
1416 | ret = regulator_resolve_supply(r); | |
1417 | if (ret < 0) | |
1418 | return ret; | |
1419 | ||
1420 | ret = set_supply(rdev, r); | |
1421 | if (ret < 0) | |
1422 | return ret; | |
1423 | ||
1424 | /* Cascade always-on state to supply */ | |
1425 | if (_regulator_is_enabled(rdev)) { | |
1426 | ret = regulator_enable(rdev->supply); | |
36a1f1b6 JMC |
1427 | if (ret < 0) { |
1428 | if (rdev->supply) | |
1429 | _regulator_put(rdev->supply); | |
6261b06d | 1430 | return ret; |
36a1f1b6 | 1431 | } |
6261b06d BA |
1432 | } |
1433 | ||
1434 | return 0; | |
1435 | } | |
1436 | ||
5ffbd136 MB |
1437 | /* Internal regulator request function */ |
1438 | static struct regulator *_regulator_get(struct device *dev, const char *id, | |
4ddfebd3 | 1439 | bool exclusive, bool allow_dummy) |
414c70cb LG |
1440 | { |
1441 | struct regulator_dev *rdev; | |
04bf3011 | 1442 | struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); |
40f9244f | 1443 | const char *devname = NULL; |
317b5684 | 1444 | int ret; |
414c70cb LG |
1445 | |
1446 | if (id == NULL) { | |
5da84fd9 | 1447 | pr_err("get() with no identifier\n"); |
043c998f | 1448 | return ERR_PTR(-EINVAL); |
414c70cb LG |
1449 | } |
1450 | ||
40f9244f MB |
1451 | if (dev) |
1452 | devname = dev_name(dev); | |
1453 | ||
317b5684 MB |
1454 | if (have_full_constraints()) |
1455 | ret = -ENODEV; | |
1456 | else | |
1457 | ret = -EPROBE_DEFER; | |
1458 | ||
414c70cb LG |
1459 | mutex_lock(®ulator_list_mutex); |
1460 | ||
6d191a5f | 1461 | rdev = regulator_dev_lookup(dev, id, &ret); |
69511a45 RN |
1462 | if (rdev) |
1463 | goto found; | |
1464 | ||
ef60abbb MB |
1465 | regulator = ERR_PTR(ret); |
1466 | ||
1e4b545c NM |
1467 | /* |
1468 | * If we have return value from dev_lookup fail, we do not expect to | |
1469 | * succeed, so, quit with appropriate error value | |
1470 | */ | |
0d25d09d | 1471 | if (ret && ret != -ENODEV) |
1e4b545c | 1472 | goto out; |
1e4b545c | 1473 | |
34abbd68 MB |
1474 | if (!devname) |
1475 | devname = "deviceless"; | |
1476 | ||
4ddfebd3 MB |
1477 | /* |
1478 | * Assume that a regulator is physically present and enabled | |
1479 | * even if it isn't hooked up and just provide a dummy. | |
34abbd68 | 1480 | */ |
87b28417 | 1481 | if (have_full_constraints() && allow_dummy) { |
5da84fd9 JP |
1482 | pr_warn("%s supply %s not found, using dummy regulator\n", |
1483 | devname, id); | |
4ddfebd3 | 1484 | |
34abbd68 MB |
1485 | rdev = dummy_regulator_rdev; |
1486 | goto found; | |
0781719b HG |
1487 | /* Don't log an error when called from regulator_get_optional() */ |
1488 | } else if (!have_full_constraints() || exclusive) { | |
acc3d5ce | 1489 | dev_warn(dev, "dummy supplies not allowed\n"); |
34abbd68 | 1490 | } |
34abbd68 | 1491 | |
414c70cb LG |
1492 | mutex_unlock(®ulator_list_mutex); |
1493 | return regulator; | |
1494 | ||
1495 | found: | |
5ffbd136 MB |
1496 | if (rdev->exclusive) { |
1497 | regulator = ERR_PTR(-EPERM); | |
1498 | goto out; | |
1499 | } | |
1500 | ||
1501 | if (exclusive && rdev->open_count) { | |
1502 | regulator = ERR_PTR(-EBUSY); | |
1503 | goto out; | |
1504 | } | |
1505 | ||
6261b06d BA |
1506 | ret = regulator_resolve_supply(rdev); |
1507 | if (ret < 0) { | |
1508 | regulator = ERR_PTR(ret); | |
1509 | goto out; | |
1510 | } | |
1511 | ||
a5766f11 LG |
1512 | if (!try_module_get(rdev->owner)) |
1513 | goto out; | |
1514 | ||
414c70cb LG |
1515 | regulator = create_regulator(rdev, dev, id); |
1516 | if (regulator == NULL) { | |
1517 | regulator = ERR_PTR(-ENOMEM); | |
1518 | module_put(rdev->owner); | |
bcda4321 | 1519 | goto out; |
414c70cb LG |
1520 | } |
1521 | ||
5ffbd136 MB |
1522 | rdev->open_count++; |
1523 | if (exclusive) { | |
1524 | rdev->exclusive = 1; | |
1525 | ||
1526 | ret = _regulator_is_enabled(rdev); | |
1527 | if (ret > 0) | |
1528 | rdev->use_count = 1; | |
1529 | else | |
1530 | rdev->use_count = 0; | |
1531 | } | |
1532 | ||
a5766f11 | 1533 | out: |
414c70cb | 1534 | mutex_unlock(®ulator_list_mutex); |
5ffbd136 | 1535 | |
414c70cb LG |
1536 | return regulator; |
1537 | } | |
5ffbd136 MB |
1538 | |
1539 | /** | |
1540 | * regulator_get - lookup and obtain a reference to a regulator. | |
1541 | * @dev: device for regulator "consumer" | |
1542 | * @id: Supply name or regulator ID. | |
1543 | * | |
1544 | * Returns a struct regulator corresponding to the regulator producer, | |
1545 | * or IS_ERR() condition containing errno. | |
1546 | * | |
1547 | * Use of supply names configured via regulator_set_device_supply() is | |
1548 | * strongly encouraged. It is recommended that the supply name used | |
1549 | * should match the name used for the supply and/or the relevant | |
1550 | * device pins in the datasheet. | |
1551 | */ | |
1552 | struct regulator *regulator_get(struct device *dev, const char *id) | |
1553 | { | |
4ddfebd3 | 1554 | return _regulator_get(dev, id, false, true); |
5ffbd136 | 1555 | } |
414c70cb LG |
1556 | EXPORT_SYMBOL_GPL(regulator_get); |
1557 | ||
5ffbd136 MB |
1558 | /** |
1559 | * regulator_get_exclusive - obtain exclusive access to a regulator. | |
1560 | * @dev: device for regulator "consumer" | |
1561 | * @id: Supply name or regulator ID. | |
1562 | * | |
1563 | * Returns a struct regulator corresponding to the regulator producer, | |
1564 | * or IS_ERR() condition containing errno. Other consumers will be | |
69c3f723 SB |
1565 | * unable to obtain this regulator while this reference is held and the |
1566 | * use count for the regulator will be initialised to reflect the current | |
1567 | * state of the regulator. | |
5ffbd136 MB |
1568 | * |
1569 | * This is intended for use by consumers which cannot tolerate shared | |
1570 | * use of the regulator such as those which need to force the | |
1571 | * regulator off for correct operation of the hardware they are | |
1572 | * controlling. | |
1573 | * | |
1574 | * Use of supply names configured via regulator_set_device_supply() is | |
1575 | * strongly encouraged. It is recommended that the supply name used | |
1576 | * should match the name used for the supply and/or the relevant | |
1577 | * device pins in the datasheet. | |
1578 | */ | |
1579 | struct regulator *regulator_get_exclusive(struct device *dev, const char *id) | |
1580 | { | |
4ddfebd3 | 1581 | return _regulator_get(dev, id, true, false); |
5ffbd136 MB |
1582 | } |
1583 | EXPORT_SYMBOL_GPL(regulator_get_exclusive); | |
1584 | ||
de1dd9fd MB |
1585 | /** |
1586 | * regulator_get_optional - obtain optional access to a regulator. | |
1587 | * @dev: device for regulator "consumer" | |
1588 | * @id: Supply name or regulator ID. | |
1589 | * | |
1590 | * Returns a struct regulator corresponding to the regulator producer, | |
69c3f723 | 1591 | * or IS_ERR() condition containing errno. |
de1dd9fd MB |
1592 | * |
1593 | * This is intended for use by consumers for devices which can have | |
1594 | * some supplies unconnected in normal use, such as some MMC devices. | |
1595 | * It can allow the regulator core to provide stub supplies for other | |
1596 | * supplies requested using normal regulator_get() calls without | |
1597 | * disrupting the operation of drivers that can handle absent | |
1598 | * supplies. | |
1599 | * | |
1600 | * Use of supply names configured via regulator_set_device_supply() is | |
1601 | * strongly encouraged. It is recommended that the supply name used | |
1602 | * should match the name used for the supply and/or the relevant | |
1603 | * device pins in the datasheet. | |
1604 | */ | |
1605 | struct regulator *regulator_get_optional(struct device *dev, const char *id) | |
1606 | { | |
4ddfebd3 | 1607 | return _regulator_get(dev, id, false, false); |
de1dd9fd MB |
1608 | } |
1609 | EXPORT_SYMBOL_GPL(regulator_get_optional); | |
1610 | ||
83b0302d | 1611 | /* regulator_list_mutex lock held by regulator_put() */ |
23ff2f0f | 1612 | static void _regulator_put(struct regulator *regulator) |
414c70cb LG |
1613 | { |
1614 | struct regulator_dev *rdev; | |
1615 | ||
93576842 | 1616 | if (IS_ERR_OR_NULL(regulator)) |
414c70cb LG |
1617 | return; |
1618 | ||
70cfef26 KK |
1619 | lockdep_assert_held_once(®ulator_list_mutex); |
1620 | ||
414c70cb LG |
1621 | rdev = regulator->rdev; |
1622 | ||
5de70519 | 1623 | debugfs_remove_recursive(regulator->debugfs); |
5de70519 | 1624 | |
414c70cb | 1625 | /* remove any sysfs entries */ |
e2c98eaf | 1626 | if (regulator->dev) |
414c70cb | 1627 | sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); |
83b0302d | 1628 | mutex_lock(&rdev->mutex); |
414c70cb | 1629 | list_del(®ulator->list); |
414c70cb | 1630 | |
5ffbd136 MB |
1631 | rdev->open_count--; |
1632 | rdev->exclusive = 0; | |
83b0302d | 1633 | mutex_unlock(&rdev->mutex); |
5ffbd136 | 1634 | |
1768514e MB |
1635 | kfree(regulator->supply_name); |
1636 | kfree(regulator); | |
1637 | ||
414c70cb | 1638 | module_put(rdev->owner); |
23ff2f0f CK |
1639 | } |
1640 | ||
1641 | /** | |
1642 | * regulator_put - "free" the regulator source | |
1643 | * @regulator: regulator source | |
1644 | * | |
1645 | * Note: drivers must ensure that all regulator_enable calls made on this | |
1646 | * regulator source are balanced by regulator_disable calls prior to calling | |
1647 | * this function. | |
1648 | */ | |
1649 | void regulator_put(struct regulator *regulator) | |
1650 | { | |
1651 | mutex_lock(®ulator_list_mutex); | |
1652 | _regulator_put(regulator); | |
414c70cb LG |
1653 | mutex_unlock(®ulator_list_mutex); |
1654 | } | |
1655 | EXPORT_SYMBOL_GPL(regulator_put); | |
1656 | ||
a06ccd9c CK |
1657 | /** |
1658 | * regulator_register_supply_alias - Provide device alias for supply lookup | |
1659 | * | |
1660 | * @dev: device that will be given as the regulator "consumer" | |
1661 | * @id: Supply name or regulator ID | |
1662 | * @alias_dev: device that should be used to lookup the supply | |
1663 | * @alias_id: Supply name or regulator ID that should be used to lookup the | |
1664 | * supply | |
1665 | * | |
1666 | * All lookups for id on dev will instead be conducted for alias_id on | |
1667 | * alias_dev. | |
1668 | */ | |
1669 | int regulator_register_supply_alias(struct device *dev, const char *id, | |
1670 | struct device *alias_dev, | |
1671 | const char *alias_id) | |
1672 | { | |
1673 | struct regulator_supply_alias *map; | |
1674 | ||
1675 | map = regulator_find_supply_alias(dev, id); | |
1676 | if (map) | |
1677 | return -EEXIST; | |
1678 | ||
1679 | map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); | |
1680 | if (!map) | |
1681 | return -ENOMEM; | |
1682 | ||
1683 | map->src_dev = dev; | |
1684 | map->src_supply = id; | |
1685 | map->alias_dev = alias_dev; | |
1686 | map->alias_supply = alias_id; | |
1687 | ||
1688 | list_add(&map->list, ®ulator_supply_alias_list); | |
1689 | ||
1690 | pr_info("Adding alias for supply %s,%s -> %s,%s\n", | |
1691 | id, dev_name(dev), alias_id, dev_name(alias_dev)); | |
1692 | ||
1693 | return 0; | |
1694 | } | |
1695 | EXPORT_SYMBOL_GPL(regulator_register_supply_alias); | |
1696 | ||
1697 | /** | |
1698 | * regulator_unregister_supply_alias - Remove device alias | |
1699 | * | |
1700 | * @dev: device that will be given as the regulator "consumer" | |
1701 | * @id: Supply name or regulator ID | |
1702 | * | |
1703 | * Remove a lookup alias if one exists for id on dev. | |
1704 | */ | |
1705 | void regulator_unregister_supply_alias(struct device *dev, const char *id) | |
1706 | { | |
1707 | struct regulator_supply_alias *map; | |
1708 | ||
1709 | map = regulator_find_supply_alias(dev, id); | |
1710 | if (map) { | |
1711 | list_del(&map->list); | |
1712 | kfree(map); | |
1713 | } | |
1714 | } | |
1715 | EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); | |
1716 | ||
1717 | /** | |
1718 | * regulator_bulk_register_supply_alias - register multiple aliases | |
1719 | * | |
1720 | * @dev: device that will be given as the regulator "consumer" | |
1721 | * @id: List of supply names or regulator IDs | |
1722 | * @alias_dev: device that should be used to lookup the supply | |
1723 | * @alias_id: List of supply names or regulator IDs that should be used to | |
1724 | * lookup the supply | |
1725 | * @num_id: Number of aliases to register | |
1726 | * | |
1727 | * @return 0 on success, an errno on failure. | |
1728 | * | |
1729 | * This helper function allows drivers to register several supply | |
1730 | * aliases in one operation. If any of the aliases cannot be | |
1731 | * registered any aliases that were registered will be removed | |
1732 | * before returning to the caller. | |
1733 | */ | |
9f8c0fe9 LJ |
1734 | int regulator_bulk_register_supply_alias(struct device *dev, |
1735 | const char *const *id, | |
a06ccd9c | 1736 | struct device *alias_dev, |
9f8c0fe9 | 1737 | const char *const *alias_id, |
a06ccd9c CK |
1738 | int num_id) |
1739 | { | |
1740 | int i; | |
1741 | int ret; | |
1742 | ||
1743 | for (i = 0; i < num_id; ++i) { | |
1744 | ret = regulator_register_supply_alias(dev, id[i], alias_dev, | |
1745 | alias_id[i]); | |
1746 | if (ret < 0) | |
1747 | goto err; | |
1748 | } | |
1749 | ||
1750 | return 0; | |
1751 | ||
1752 | err: | |
1753 | dev_err(dev, | |
1754 | "Failed to create supply alias %s,%s -> %s,%s\n", | |
1755 | id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); | |
1756 | ||
1757 | while (--i >= 0) | |
1758 | regulator_unregister_supply_alias(dev, id[i]); | |
1759 | ||
1760 | return ret; | |
1761 | } | |
1762 | EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); | |
1763 | ||
1764 | /** | |
1765 | * regulator_bulk_unregister_supply_alias - unregister multiple aliases | |
1766 | * | |
1767 | * @dev: device that will be given as the regulator "consumer" | |
1768 | * @id: List of supply names or regulator IDs | |
1769 | * @num_id: Number of aliases to unregister | |
1770 | * | |
1771 | * This helper function allows drivers to unregister several supply | |
1772 | * aliases in one operation. | |
1773 | */ | |
1774 | void regulator_bulk_unregister_supply_alias(struct device *dev, | |
9f8c0fe9 | 1775 | const char *const *id, |
a06ccd9c CK |
1776 | int num_id) |
1777 | { | |
1778 | int i; | |
1779 | ||
1780 | for (i = 0; i < num_id; ++i) | |
1781 | regulator_unregister_supply_alias(dev, id[i]); | |
1782 | } | |
1783 | EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); | |
1784 | ||
1785 | ||
f19b00da KM |
1786 | /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ |
1787 | static int regulator_ena_gpio_request(struct regulator_dev *rdev, | |
1788 | const struct regulator_config *config) | |
1789 | { | |
1790 | struct regulator_enable_gpio *pin; | |
778b28b4 | 1791 | struct gpio_desc *gpiod; |
f19b00da KM |
1792 | int ret; |
1793 | ||
778b28b4 RK |
1794 | gpiod = gpio_to_desc(config->ena_gpio); |
1795 | ||
f19b00da | 1796 | list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { |
778b28b4 | 1797 | if (pin->gpiod == gpiod) { |
f19b00da KM |
1798 | rdev_dbg(rdev, "GPIO %d is already used\n", |
1799 | config->ena_gpio); | |
1800 | goto update_ena_gpio_to_rdev; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | ret = gpio_request_one(config->ena_gpio, | |
1805 | GPIOF_DIR_OUT | config->ena_gpio_flags, | |
1806 | rdev_get_name(rdev)); | |
1807 | if (ret) | |
1808 | return ret; | |
1809 | ||
1810 | pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); | |
1811 | if (pin == NULL) { | |
1812 | gpio_free(config->ena_gpio); | |
1813 | return -ENOMEM; | |
1814 | } | |
1815 | ||
778b28b4 | 1816 | pin->gpiod = gpiod; |
f19b00da KM |
1817 | pin->ena_gpio_invert = config->ena_gpio_invert; |
1818 | list_add(&pin->list, ®ulator_ena_gpio_list); | |
1819 | ||
1820 | update_ena_gpio_to_rdev: | |
1821 | pin->request_count++; | |
1822 | rdev->ena_pin = pin; | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | static void regulator_ena_gpio_free(struct regulator_dev *rdev) | |
1827 | { | |
1828 | struct regulator_enable_gpio *pin, *n; | |
1829 | ||
1830 | if (!rdev->ena_pin) | |
1831 | return; | |
1832 | ||
1833 | /* Free the GPIO only in case of no use */ | |
1834 | list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { | |
778b28b4 | 1835 | if (pin->gpiod == rdev->ena_pin->gpiod) { |
f19b00da KM |
1836 | if (pin->request_count <= 1) { |
1837 | pin->request_count = 0; | |
778b28b4 | 1838 | gpiod_put(pin->gpiod); |
f19b00da KM |
1839 | list_del(&pin->list); |
1840 | kfree(pin); | |
60a2362f SWK |
1841 | rdev->ena_pin = NULL; |
1842 | return; | |
f19b00da KM |
1843 | } else { |
1844 | pin->request_count--; | |
1845 | } | |
1846 | } | |
1847 | } | |
1848 | } | |
1849 | ||
967cfb18 | 1850 | /** |
31d6eebf RD |
1851 | * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control |
1852 | * @rdev: regulator_dev structure | |
1853 | * @enable: enable GPIO at initial use? | |
1854 | * | |
967cfb18 KM |
1855 | * GPIO is enabled in case of initial use. (enable_count is 0) |
1856 | * GPIO is disabled when it is not shared any more. (enable_count <= 1) | |
1857 | */ | |
1858 | static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) | |
1859 | { | |
1860 | struct regulator_enable_gpio *pin = rdev->ena_pin; | |
1861 | ||
1862 | if (!pin) | |
1863 | return -EINVAL; | |
1864 | ||
1865 | if (enable) { | |
1866 | /* Enable GPIO at initial use */ | |
1867 | if (pin->enable_count == 0) | |
778b28b4 RK |
1868 | gpiod_set_value_cansleep(pin->gpiod, |
1869 | !pin->ena_gpio_invert); | |
967cfb18 KM |
1870 | |
1871 | pin->enable_count++; | |
1872 | } else { | |
1873 | if (pin->enable_count > 1) { | |
1874 | pin->enable_count--; | |
1875 | return 0; | |
1876 | } | |
1877 | ||
1878 | /* Disable GPIO if not used */ | |
1879 | if (pin->enable_count <= 1) { | |
778b28b4 RK |
1880 | gpiod_set_value_cansleep(pin->gpiod, |
1881 | pin->ena_gpio_invert); | |
967cfb18 KM |
1882 | pin->enable_count = 0; |
1883 | } | |
1884 | } | |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | ||
79fd1141 GX |
1889 | /** |
1890 | * _regulator_enable_delay - a delay helper function | |
1891 | * @delay: time to delay in microseconds | |
1892 | * | |
1893 | * Delay for the requested amount of time as per the guidelines in: | |
1894 | * | |
1895 | * Documentation/timers/timers-howto.txt | |
1896 | * | |
1897 | * The assumption here is that regulators will never be enabled in | |
1898 | * atomic context and therefore sleeping functions can be used. | |
1899 | */ | |
1900 | static void _regulator_enable_delay(unsigned int delay) | |
1901 | { | |
1902 | unsigned int ms = delay / 1000; | |
1903 | unsigned int us = delay % 1000; | |
1904 | ||
1905 | if (ms > 0) { | |
1906 | /* | |
1907 | * For small enough values, handle super-millisecond | |
1908 | * delays in the usleep_range() call below. | |
1909 | */ | |
1910 | if (ms < 20) | |
1911 | us += ms * 1000; | |
1912 | else | |
1913 | msleep(ms); | |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * Give the scheduler some room to coalesce with any other | |
1918 | * wakeup sources. For delays shorter than 10 us, don't even | |
1919 | * bother setting up high-resolution timers and just busy- | |
1920 | * loop. | |
1921 | */ | |
1922 | if (us >= 10) | |
1923 | usleep_range(us, us + 100); | |
1924 | else | |
1925 | udelay(us); | |
1926 | } | |
1927 | ||
5c5659d0 MB |
1928 | static int _regulator_do_enable(struct regulator_dev *rdev) |
1929 | { | |
1930 | int ret, delay; | |
1931 | ||
1932 | /* Query before enabling in case configuration dependent. */ | |
1933 | ret = _regulator_get_enable_time(rdev); | |
1934 | if (ret >= 0) { | |
1935 | delay = ret; | |
1936 | } else { | |
1937 | rdev_warn(rdev, "enable_time() failed: %d\n", ret); | |
1938 | delay = 0; | |
1939 | } | |
1940 | ||
1941 | trace_regulator_enable(rdev_get_name(rdev)); | |
1942 | ||
871f5650 GX |
1943 | if (rdev->desc->off_on_delay) { |
1944 | /* if needed, keep a distance of off_on_delay from last time | |
1945 | * this regulator was disabled. | |
1946 | */ | |
1947 | unsigned long start_jiffy = jiffies; | |
1948 | unsigned long intended, max_delay, remaining; | |
1949 | ||
1950 | max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); | |
1951 | intended = rdev->last_off_jiffy + max_delay; | |
1952 | ||
1953 | if (time_before(start_jiffy, intended)) { | |
1954 | /* calc remaining jiffies to deal with one-time | |
1955 | * timer wrapping. | |
1956 | * in case of multiple timer wrapping, either it can be | |
1957 | * detected by out-of-range remaining, or it cannot be | |
1958 | * detected and we gets a panelty of | |
1959 | * _regulator_enable_delay(). | |
1960 | */ | |
1961 | remaining = intended - start_jiffy; | |
1962 | if (remaining <= max_delay) | |
1963 | _regulator_enable_delay( | |
1964 | jiffies_to_usecs(remaining)); | |
1965 | } | |
1966 | } | |
1967 | ||
967cfb18 | 1968 | if (rdev->ena_pin) { |
29d62ec5 DA |
1969 | if (!rdev->ena_gpio_state) { |
1970 | ret = regulator_ena_gpio_ctrl(rdev, true); | |
1971 | if (ret < 0) | |
1972 | return ret; | |
1973 | rdev->ena_gpio_state = 1; | |
1974 | } | |
65f73508 | 1975 | } else if (rdev->desc->ops->enable) { |
5c5659d0 MB |
1976 | ret = rdev->desc->ops->enable(rdev); |
1977 | if (ret < 0) | |
1978 | return ret; | |
1979 | } else { | |
1980 | return -EINVAL; | |
1981 | } | |
1982 | ||
1983 | /* Allow the regulator to ramp; it would be useful to extend | |
1984 | * this for bulk operations so that the regulators can ramp | |
1985 | * together. */ | |
1986 | trace_regulator_enable_delay(rdev_get_name(rdev)); | |
1987 | ||
79fd1141 | 1988 | _regulator_enable_delay(delay); |
5c5659d0 MB |
1989 | |
1990 | trace_regulator_enable_complete(rdev_get_name(rdev)); | |
1991 | ||
1992 | return 0; | |
1993 | } | |
1994 | ||
414c70cb LG |
1995 | /* locks held by regulator_enable() */ |
1996 | static int _regulator_enable(struct regulator_dev *rdev) | |
1997 | { | |
5c5659d0 | 1998 | int ret; |
414c70cb | 1999 | |
70cfef26 KK |
2000 | lockdep_assert_held_once(&rdev->mutex); |
2001 | ||
414c70cb | 2002 | /* check voltage and requested load before enabling */ |
9a2372fa MB |
2003 | if (rdev->constraints && |
2004 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) | |
2005 | drms_uA_update(rdev); | |
414c70cb | 2006 | |
9a2372fa MB |
2007 | if (rdev->use_count == 0) { |
2008 | /* The regulator may on if it's not switchable or left on */ | |
2009 | ret = _regulator_is_enabled(rdev); | |
2010 | if (ret == -EINVAL || ret == 0) { | |
2011 | if (!_regulator_can_change_status(rdev)) | |
2012 | return -EPERM; | |
2013 | ||
5c5659d0 | 2014 | ret = _regulator_do_enable(rdev); |
31aae2be MB |
2015 | if (ret < 0) |
2016 | return ret; | |
2017 | ||
a7433cff | 2018 | } else if (ret < 0) { |
5da84fd9 | 2019 | rdev_err(rdev, "is_enabled() failed: %d\n", ret); |
414c70cb LG |
2020 | return ret; |
2021 | } | |
a7433cff | 2022 | /* Fallthrough on positive return values - already enabled */ |
414c70cb LG |
2023 | } |
2024 | ||
9a2372fa MB |
2025 | rdev->use_count++; |
2026 | ||
2027 | return 0; | |
414c70cb LG |
2028 | } |
2029 | ||
2030 | /** | |
2031 | * regulator_enable - enable regulator output | |
2032 | * @regulator: regulator source | |
2033 | * | |
cf7bbcdf MB |
2034 | * Request that the regulator be enabled with the regulator output at |
2035 | * the predefined voltage or current value. Calls to regulator_enable() | |
2036 | * must be balanced with calls to regulator_disable(). | |
2037 | * | |
414c70cb | 2038 | * NOTE: the output value can be set by other drivers, boot loader or may be |
cf7bbcdf | 2039 | * hardwired in the regulator. |
414c70cb LG |
2040 | */ |
2041 | int regulator_enable(struct regulator *regulator) | |
2042 | { | |
412aec61 DB |
2043 | struct regulator_dev *rdev = regulator->rdev; |
2044 | int ret = 0; | |
414c70cb | 2045 | |
6492bc1b MB |
2046 | if (regulator->always_on) |
2047 | return 0; | |
2048 | ||
3801b86a MB |
2049 | if (rdev->supply) { |
2050 | ret = regulator_enable(rdev->supply); | |
2051 | if (ret != 0) | |
2052 | return ret; | |
2053 | } | |
2054 | ||
412aec61 | 2055 | mutex_lock(&rdev->mutex); |
cd94b505 | 2056 | ret = _regulator_enable(rdev); |
412aec61 | 2057 | mutex_unlock(&rdev->mutex); |
3801b86a | 2058 | |
d1685e4e | 2059 | if (ret != 0 && rdev->supply) |
3801b86a MB |
2060 | regulator_disable(rdev->supply); |
2061 | ||
414c70cb LG |
2062 | return ret; |
2063 | } | |
2064 | EXPORT_SYMBOL_GPL(regulator_enable); | |
2065 | ||
5c5659d0 MB |
2066 | static int _regulator_do_disable(struct regulator_dev *rdev) |
2067 | { | |
2068 | int ret; | |
2069 | ||
2070 | trace_regulator_disable(rdev_get_name(rdev)); | |
2071 | ||
967cfb18 | 2072 | if (rdev->ena_pin) { |
29d62ec5 DA |
2073 | if (rdev->ena_gpio_state) { |
2074 | ret = regulator_ena_gpio_ctrl(rdev, false); | |
2075 | if (ret < 0) | |
2076 | return ret; | |
2077 | rdev->ena_gpio_state = 0; | |
2078 | } | |
5c5659d0 MB |
2079 | |
2080 | } else if (rdev->desc->ops->disable) { | |
2081 | ret = rdev->desc->ops->disable(rdev); | |
2082 | if (ret != 0) | |
2083 | return ret; | |
2084 | } | |
2085 | ||
871f5650 GX |
2086 | /* cares about last_off_jiffy only if off_on_delay is required by |
2087 | * device. | |
2088 | */ | |
2089 | if (rdev->desc->off_on_delay) | |
2090 | rdev->last_off_jiffy = jiffies; | |
2091 | ||
5c5659d0 MB |
2092 | trace_regulator_disable_complete(rdev_get_name(rdev)); |
2093 | ||
5c5659d0 MB |
2094 | return 0; |
2095 | } | |
2096 | ||
414c70cb | 2097 | /* locks held by regulator_disable() */ |
3801b86a | 2098 | static int _regulator_disable(struct regulator_dev *rdev) |
414c70cb LG |
2099 | { |
2100 | int ret = 0; | |
2101 | ||
70cfef26 KK |
2102 | lockdep_assert_held_once(&rdev->mutex); |
2103 | ||
cd94b505 | 2104 | if (WARN(rdev->use_count <= 0, |
43e7ee33 | 2105 | "unbalanced disables for %s\n", rdev_get_name(rdev))) |
cd94b505 DB |
2106 | return -EIO; |
2107 | ||
414c70cb | 2108 | /* are we the last user and permitted to disable ? */ |
60ef66fc MB |
2109 | if (rdev->use_count == 1 && |
2110 | (rdev->constraints && !rdev->constraints->always_on)) { | |
414c70cb LG |
2111 | |
2112 | /* we are last user */ | |
5c5659d0 | 2113 | if (_regulator_can_change_status(rdev)) { |
a1c8a551 RF |
2114 | ret = _notifier_call_chain(rdev, |
2115 | REGULATOR_EVENT_PRE_DISABLE, | |
2116 | NULL); | |
2117 | if (ret & NOTIFY_STOP_MASK) | |
2118 | return -EINVAL; | |
2119 | ||
5c5659d0 | 2120 | ret = _regulator_do_disable(rdev); |
414c70cb | 2121 | if (ret < 0) { |
5da84fd9 | 2122 | rdev_err(rdev, "failed to disable\n"); |
a1c8a551 RF |
2123 | _notifier_call_chain(rdev, |
2124 | REGULATOR_EVENT_ABORT_DISABLE, | |
2125 | NULL); | |
414c70cb LG |
2126 | return ret; |
2127 | } | |
66fda75f MP |
2128 | _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, |
2129 | NULL); | |
414c70cb LG |
2130 | } |
2131 | ||
414c70cb LG |
2132 | rdev->use_count = 0; |
2133 | } else if (rdev->use_count > 1) { | |
2134 | ||
2135 | if (rdev->constraints && | |
2136 | (rdev->constraints->valid_ops_mask & | |
2137 | REGULATOR_CHANGE_DRMS)) | |
2138 | drms_uA_update(rdev); | |
2139 | ||
2140 | rdev->use_count--; | |
2141 | } | |
3801b86a | 2142 | |
414c70cb LG |
2143 | return ret; |
2144 | } | |
2145 | ||
2146 | /** | |
2147 | * regulator_disable - disable regulator output | |
2148 | * @regulator: regulator source | |
2149 | * | |
cf7bbcdf MB |
2150 | * Disable the regulator output voltage or current. Calls to |
2151 | * regulator_enable() must be balanced with calls to | |
2152 | * regulator_disable(). | |
69279fb9 | 2153 | * |
414c70cb | 2154 | * NOTE: this will only disable the regulator output if no other consumer |
cf7bbcdf MB |
2155 | * devices have it enabled, the regulator device supports disabling and |
2156 | * machine constraints permit this operation. | |
414c70cb LG |
2157 | */ |
2158 | int regulator_disable(struct regulator *regulator) | |
2159 | { | |
412aec61 DB |
2160 | struct regulator_dev *rdev = regulator->rdev; |
2161 | int ret = 0; | |
414c70cb | 2162 | |
6492bc1b MB |
2163 | if (regulator->always_on) |
2164 | return 0; | |
2165 | ||
412aec61 | 2166 | mutex_lock(&rdev->mutex); |
3801b86a | 2167 | ret = _regulator_disable(rdev); |
412aec61 | 2168 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2169 | |
3801b86a MB |
2170 | if (ret == 0 && rdev->supply) |
2171 | regulator_disable(rdev->supply); | |
8cbf811d | 2172 | |
414c70cb LG |
2173 | return ret; |
2174 | } | |
2175 | EXPORT_SYMBOL_GPL(regulator_disable); | |
2176 | ||
2177 | /* locks held by regulator_force_disable() */ | |
3801b86a | 2178 | static int _regulator_force_disable(struct regulator_dev *rdev) |
414c70cb LG |
2179 | { |
2180 | int ret = 0; | |
2181 | ||
70cfef26 KK |
2182 | lockdep_assert_held_once(&rdev->mutex); |
2183 | ||
a1c8a551 RF |
2184 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2185 | REGULATOR_EVENT_PRE_DISABLE, NULL); | |
2186 | if (ret & NOTIFY_STOP_MASK) | |
2187 | return -EINVAL; | |
2188 | ||
66fda75f MP |
2189 | ret = _regulator_do_disable(rdev); |
2190 | if (ret < 0) { | |
2191 | rdev_err(rdev, "failed to force disable\n"); | |
a1c8a551 RF |
2192 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2193 | REGULATOR_EVENT_ABORT_DISABLE, NULL); | |
66fda75f | 2194 | return ret; |
414c70cb LG |
2195 | } |
2196 | ||
66fda75f MP |
2197 | _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | |
2198 | REGULATOR_EVENT_DISABLE, NULL); | |
2199 | ||
2200 | return 0; | |
414c70cb LG |
2201 | } |
2202 | ||
2203 | /** | |
2204 | * regulator_force_disable - force disable regulator output | |
2205 | * @regulator: regulator source | |
2206 | * | |
2207 | * Forcibly disable the regulator output voltage or current. | |
2208 | * NOTE: this *will* disable the regulator output even if other consumer | |
2209 | * devices have it enabled. This should be used for situations when device | |
2210 | * damage will likely occur if the regulator is not disabled (e.g. over temp). | |
2211 | */ | |
2212 | int regulator_force_disable(struct regulator *regulator) | |
2213 | { | |
82d15839 | 2214 | struct regulator_dev *rdev = regulator->rdev; |
414c70cb LG |
2215 | int ret; |
2216 | ||
82d15839 | 2217 | mutex_lock(&rdev->mutex); |
414c70cb | 2218 | regulator->uA_load = 0; |
3801b86a | 2219 | ret = _regulator_force_disable(regulator->rdev); |
82d15839 | 2220 | mutex_unlock(&rdev->mutex); |
8cbf811d | 2221 | |
3801b86a MB |
2222 | if (rdev->supply) |
2223 | while (rdev->open_count--) | |
2224 | regulator_disable(rdev->supply); | |
8cbf811d | 2225 | |
414c70cb LG |
2226 | return ret; |
2227 | } | |
2228 | EXPORT_SYMBOL_GPL(regulator_force_disable); | |
2229 | ||
da07ecd9 MB |
2230 | static void regulator_disable_work(struct work_struct *work) |
2231 | { | |
2232 | struct regulator_dev *rdev = container_of(work, struct regulator_dev, | |
2233 | disable_work.work); | |
2234 | int count, i, ret; | |
2235 | ||
2236 | mutex_lock(&rdev->mutex); | |
2237 | ||
2238 | BUG_ON(!rdev->deferred_disables); | |
2239 | ||
2240 | count = rdev->deferred_disables; | |
2241 | rdev->deferred_disables = 0; | |
2242 | ||
2243 | for (i = 0; i < count; i++) { | |
2244 | ret = _regulator_disable(rdev); | |
2245 | if (ret != 0) | |
2246 | rdev_err(rdev, "Deferred disable failed: %d\n", ret); | |
2247 | } | |
2248 | ||
2249 | mutex_unlock(&rdev->mutex); | |
2250 | ||
2251 | if (rdev->supply) { | |
2252 | for (i = 0; i < count; i++) { | |
2253 | ret = regulator_disable(rdev->supply); | |
2254 | if (ret != 0) { | |
2255 | rdev_err(rdev, | |
2256 | "Supply disable failed: %d\n", ret); | |
2257 | } | |
2258 | } | |
2259 | } | |
2260 | } | |
2261 | ||
2262 | /** | |
2263 | * regulator_disable_deferred - disable regulator output with delay | |
2264 | * @regulator: regulator source | |
2265 | * @ms: miliseconds until the regulator is disabled | |
2266 | * | |
2267 | * Execute regulator_disable() on the regulator after a delay. This | |
2268 | * is intended for use with devices that require some time to quiesce. | |
2269 | * | |
2270 | * NOTE: this will only disable the regulator output if no other consumer | |
2271 | * devices have it enabled, the regulator device supports disabling and | |
2272 | * machine constraints permit this operation. | |
2273 | */ | |
2274 | int regulator_disable_deferred(struct regulator *regulator, int ms) | |
2275 | { | |
2276 | struct regulator_dev *rdev = regulator->rdev; | |
aa59802d | 2277 | int ret; |
da07ecd9 | 2278 | |
6492bc1b MB |
2279 | if (regulator->always_on) |
2280 | return 0; | |
2281 | ||
2b5a24a0 MB |
2282 | if (!ms) |
2283 | return regulator_disable(regulator); | |
2284 | ||
da07ecd9 MB |
2285 | mutex_lock(&rdev->mutex); |
2286 | rdev->deferred_disables++; | |
2287 | mutex_unlock(&rdev->mutex); | |
2288 | ||
070260f0 MB |
2289 | ret = queue_delayed_work(system_power_efficient_wq, |
2290 | &rdev->disable_work, | |
2291 | msecs_to_jiffies(ms)); | |
aa59802d MB |
2292 | if (ret < 0) |
2293 | return ret; | |
2294 | else | |
2295 | return 0; | |
da07ecd9 MB |
2296 | } |
2297 | EXPORT_SYMBOL_GPL(regulator_disable_deferred); | |
2298 | ||
414c70cb LG |
2299 | static int _regulator_is_enabled(struct regulator_dev *rdev) |
2300 | { | |
65f73508 | 2301 | /* A GPIO control always takes precedence */ |
7b74d149 | 2302 | if (rdev->ena_pin) |
65f73508 MB |
2303 | return rdev->ena_gpio_state; |
2304 | ||
9a7f6a4c | 2305 | /* If we don't know then assume that the regulator is always on */ |
9332546f | 2306 | if (!rdev->desc->ops->is_enabled) |
9a7f6a4c | 2307 | return 1; |
414c70cb | 2308 | |
9332546f | 2309 | return rdev->desc->ops->is_enabled(rdev); |
414c70cb LG |
2310 | } |
2311 | ||
2312 | /** | |
2313 | * regulator_is_enabled - is the regulator output enabled | |
2314 | * @regulator: regulator source | |
2315 | * | |
412aec61 DB |
2316 | * Returns positive if the regulator driver backing the source/client |
2317 | * has requested that the device be enabled, zero if it hasn't, else a | |
2318 | * negative errno code. | |
2319 | * | |
2320 | * Note that the device backing this regulator handle can have multiple | |
2321 | * users, so it might be enabled even if regulator_enable() was never | |
2322 | * called for this particular source. | |
414c70cb LG |
2323 | */ |
2324 | int regulator_is_enabled(struct regulator *regulator) | |
2325 | { | |
9332546f MB |
2326 | int ret; |
2327 | ||
6492bc1b MB |
2328 | if (regulator->always_on) |
2329 | return 1; | |
2330 | ||
9332546f MB |
2331 | mutex_lock(®ulator->rdev->mutex); |
2332 | ret = _regulator_is_enabled(regulator->rdev); | |
2333 | mutex_unlock(®ulator->rdev->mutex); | |
2334 | ||
2335 | return ret; | |
414c70cb LG |
2336 | } |
2337 | EXPORT_SYMBOL_GPL(regulator_is_enabled); | |
2338 | ||
d1e7de30 MS |
2339 | /** |
2340 | * regulator_can_change_voltage - check if regulator can change voltage | |
2341 | * @regulator: regulator source | |
2342 | * | |
2343 | * Returns positive if the regulator driver backing the source/client | |
e227867f | 2344 | * can change its voltage, false otherwise. Useful for detecting fixed |
d1e7de30 MS |
2345 | * or dummy regulators and disabling voltage change logic in the client |
2346 | * driver. | |
2347 | */ | |
2348 | int regulator_can_change_voltage(struct regulator *regulator) | |
2349 | { | |
2350 | struct regulator_dev *rdev = regulator->rdev; | |
2351 | ||
2352 | if (rdev->constraints && | |
19280e40 AL |
2353 | (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { |
2354 | if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) | |
2355 | return 1; | |
2356 | ||
2357 | if (rdev->desc->continuous_voltage_range && | |
2358 | rdev->constraints->min_uV && rdev->constraints->max_uV && | |
2359 | rdev->constraints->min_uV != rdev->constraints->max_uV) | |
2360 | return 1; | |
2361 | } | |
d1e7de30 MS |
2362 | |
2363 | return 0; | |
2364 | } | |
2365 | EXPORT_SYMBOL_GPL(regulator_can_change_voltage); | |
2366 | ||
4367cfdc DB |
2367 | /** |
2368 | * regulator_count_voltages - count regulator_list_voltage() selectors | |
2369 | * @regulator: regulator source | |
2370 | * | |
2371 | * Returns number of selectors, or negative errno. Selectors are | |
2372 | * numbered starting at zero, and typically correspond to bitfields | |
2373 | * in hardware registers. | |
2374 | */ | |
2375 | int regulator_count_voltages(struct regulator *regulator) | |
2376 | { | |
2377 | struct regulator_dev *rdev = regulator->rdev; | |
2378 | ||
26988efe JMC |
2379 | if (rdev->desc->n_voltages) |
2380 | return rdev->desc->n_voltages; | |
2381 | ||
2382 | if (!rdev->supply) | |
2383 | return -EINVAL; | |
2384 | ||
2385 | return regulator_count_voltages(rdev->supply); | |
4367cfdc DB |
2386 | } |
2387 | EXPORT_SYMBOL_GPL(regulator_count_voltages); | |
2388 | ||
2389 | /** | |
2390 | * regulator_list_voltage - enumerate supported voltages | |
2391 | * @regulator: regulator source | |
2392 | * @selector: identify voltage to list | |
2393 | * Context: can sleep | |
2394 | * | |
2395 | * Returns a voltage that can be passed to @regulator_set_voltage(), | |
88393161 | 2396 | * zero if this selector code can't be used on this system, or a |
4367cfdc DB |
2397 | * negative errno. |
2398 | */ | |
2399 | int regulator_list_voltage(struct regulator *regulator, unsigned selector) | |
2400 | { | |
272e2315 GX |
2401 | struct regulator_dev *rdev = regulator->rdev; |
2402 | const struct regulator_ops *ops = rdev->desc->ops; | |
2403 | int ret; | |
4367cfdc | 2404 | |
f446043f GL |
2405 | if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) |
2406 | return rdev->desc->fixed_uV; | |
2407 | ||
26988efe JMC |
2408 | if (ops->list_voltage) { |
2409 | if (selector >= rdev->desc->n_voltages) | |
2410 | return -EINVAL; | |
2411 | mutex_lock(&rdev->mutex); | |
2412 | ret = ops->list_voltage(rdev, selector); | |
2413 | mutex_unlock(&rdev->mutex); | |
2414 | } else if (rdev->supply) { | |
2415 | ret = regulator_list_voltage(rdev->supply, selector); | |
2416 | } else { | |
4367cfdc | 2417 | return -EINVAL; |
26988efe | 2418 | } |
4367cfdc DB |
2419 | |
2420 | if (ret > 0) { | |
2421 | if (ret < rdev->constraints->min_uV) | |
2422 | ret = 0; | |
2423 | else if (ret > rdev->constraints->max_uV) | |
2424 | ret = 0; | |
2425 | } | |
2426 | ||
2427 | return ret; | |
2428 | } | |
2429 | EXPORT_SYMBOL_GPL(regulator_list_voltage); | |
2430 | ||
04eca28c TT |
2431 | /** |
2432 | * regulator_get_regmap - get the regulator's register map | |
2433 | * @regulator: regulator source | |
2434 | * | |
2435 | * Returns the register map for the given regulator, or an ERR_PTR value | |
2436 | * if the regulator doesn't use regmap. | |
2437 | */ | |
2438 | struct regmap *regulator_get_regmap(struct regulator *regulator) | |
2439 | { | |
2440 | struct regmap *map = regulator->rdev->regmap; | |
2441 | ||
2442 | return map ? map : ERR_PTR(-EOPNOTSUPP); | |
2443 | } | |
2444 | ||
2445 | /** | |
2446 | * regulator_get_hardware_vsel_register - get the HW voltage selector register | |
2447 | * @regulator: regulator source | |
2448 | * @vsel_reg: voltage selector register, output parameter | |
2449 | * @vsel_mask: mask for voltage selector bitfield, output parameter | |
2450 | * | |
2451 | * Returns the hardware register offset and bitmask used for setting the | |
2452 | * regulator voltage. This might be useful when configuring voltage-scaling | |
2453 | * hardware or firmware that can make I2C requests behind the kernel's back, | |
2454 | * for example. | |
2455 | * | |
2456 | * On success, the output parameters @vsel_reg and @vsel_mask are filled in | |
2457 | * and 0 is returned, otherwise a negative errno is returned. | |
2458 | */ | |
2459 | int regulator_get_hardware_vsel_register(struct regulator *regulator, | |
2460 | unsigned *vsel_reg, | |
2461 | unsigned *vsel_mask) | |
2462 | { | |
39f5460d GX |
2463 | struct regulator_dev *rdev = regulator->rdev; |
2464 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2465 | |
2466 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2467 | return -EOPNOTSUPP; | |
2468 | ||
2469 | *vsel_reg = rdev->desc->vsel_reg; | |
2470 | *vsel_mask = rdev->desc->vsel_mask; | |
2471 | ||
2472 | return 0; | |
2473 | } | |
2474 | EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); | |
2475 | ||
2476 | /** | |
2477 | * regulator_list_hardware_vsel - get the HW-specific register value for a selector | |
2478 | * @regulator: regulator source | |
2479 | * @selector: identify voltage to list | |
2480 | * | |
2481 | * Converts the selector to a hardware-specific voltage selector that can be | |
2482 | * directly written to the regulator registers. The address of the voltage | |
2483 | * register can be determined by calling @regulator_get_hardware_vsel_register. | |
2484 | * | |
2485 | * On error a negative errno is returned. | |
2486 | */ | |
2487 | int regulator_list_hardware_vsel(struct regulator *regulator, | |
2488 | unsigned selector) | |
2489 | { | |
39f5460d GX |
2490 | struct regulator_dev *rdev = regulator->rdev; |
2491 | const struct regulator_ops *ops = rdev->desc->ops; | |
04eca28c TT |
2492 | |
2493 | if (selector >= rdev->desc->n_voltages) | |
2494 | return -EINVAL; | |
2495 | if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) | |
2496 | return -EOPNOTSUPP; | |
2497 | ||
2498 | return selector; | |
2499 | } | |
2500 | EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); | |
2501 | ||
2a668a8b PW |
2502 | /** |
2503 | * regulator_get_linear_step - return the voltage step size between VSEL values | |
2504 | * @regulator: regulator source | |
2505 | * | |
2506 | * Returns the voltage step size between VSEL values for linear | |
2507 | * regulators, or return 0 if the regulator isn't a linear regulator. | |
2508 | */ | |
2509 | unsigned int regulator_get_linear_step(struct regulator *regulator) | |
2510 | { | |
2511 | struct regulator_dev *rdev = regulator->rdev; | |
2512 | ||
2513 | return rdev->desc->uV_step; | |
2514 | } | |
2515 | EXPORT_SYMBOL_GPL(regulator_get_linear_step); | |
2516 | ||
a7a1ad90 MB |
2517 | /** |
2518 | * regulator_is_supported_voltage - check if a voltage range can be supported | |
2519 | * | |
2520 | * @regulator: Regulator to check. | |
2521 | * @min_uV: Minimum required voltage in uV. | |
2522 | * @max_uV: Maximum required voltage in uV. | |
2523 | * | |
2524 | * Returns a boolean or a negative error code. | |
2525 | */ | |
2526 | int regulator_is_supported_voltage(struct regulator *regulator, | |
2527 | int min_uV, int max_uV) | |
2528 | { | |
c5f3939b | 2529 | struct regulator_dev *rdev = regulator->rdev; |
a7a1ad90 MB |
2530 | int i, voltages, ret; |
2531 | ||
c5f3939b MB |
2532 | /* If we can't change voltage check the current voltage */ |
2533 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2534 | ret = regulator_get_voltage(regulator); | |
2535 | if (ret >= 0) | |
0d25d09d | 2536 | return min_uV <= ret && ret <= max_uV; |
c5f3939b MB |
2537 | else |
2538 | return ret; | |
2539 | } | |
2540 | ||
bd7a2b60 PM |
2541 | /* Any voltage within constrains range is fine? */ |
2542 | if (rdev->desc->continuous_voltage_range) | |
2543 | return min_uV >= rdev->constraints->min_uV && | |
2544 | max_uV <= rdev->constraints->max_uV; | |
2545 | ||
a7a1ad90 MB |
2546 | ret = regulator_count_voltages(regulator); |
2547 | if (ret < 0) | |
2548 | return ret; | |
2549 | voltages = ret; | |
2550 | ||
2551 | for (i = 0; i < voltages; i++) { | |
2552 | ret = regulator_list_voltage(regulator, i); | |
2553 | ||
2554 | if (ret >= min_uV && ret <= max_uV) | |
2555 | return 1; | |
2556 | } | |
2557 | ||
2558 | return 0; | |
2559 | } | |
a398eaa2 | 2560 | EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); |
a7a1ad90 | 2561 | |
7179569a HS |
2562 | static int _regulator_call_set_voltage(struct regulator_dev *rdev, |
2563 | int min_uV, int max_uV, | |
2564 | unsigned *selector) | |
2565 | { | |
2566 | struct pre_voltage_change_data data; | |
2567 | int ret; | |
2568 | ||
2569 | data.old_uV = _regulator_get_voltage(rdev); | |
2570 | data.min_uV = min_uV; | |
2571 | data.max_uV = max_uV; | |
2572 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2573 | &data); | |
2574 | if (ret & NOTIFY_STOP_MASK) | |
2575 | return -EINVAL; | |
2576 | ||
2577 | ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); | |
2578 | if (ret >= 0) | |
2579 | return ret; | |
2580 | ||
2581 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2582 | (void *)data.old_uV); | |
2583 | ||
2584 | return ret; | |
2585 | } | |
2586 | ||
2587 | static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, | |
2588 | int uV, unsigned selector) | |
2589 | { | |
2590 | struct pre_voltage_change_data data; | |
2591 | int ret; | |
2592 | ||
2593 | data.old_uV = _regulator_get_voltage(rdev); | |
2594 | data.min_uV = uV; | |
2595 | data.max_uV = uV; | |
2596 | ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, | |
2597 | &data); | |
2598 | if (ret & NOTIFY_STOP_MASK) | |
2599 | return -EINVAL; | |
2600 | ||
2601 | ret = rdev->desc->ops->set_voltage_sel(rdev, selector); | |
2602 | if (ret >= 0) | |
2603 | return ret; | |
2604 | ||
2605 | _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, | |
2606 | (void *)data.old_uV); | |
2607 | ||
2608 | return ret; | |
2609 | } | |
2610 | ||
75790251 MB |
2611 | static int _regulator_do_set_voltage(struct regulator_dev *rdev, |
2612 | int min_uV, int max_uV) | |
2613 | { | |
2614 | int ret; | |
77af1b26 | 2615 | int delay = 0; |
e113d792 | 2616 | int best_val = 0; |
75790251 | 2617 | unsigned int selector; |
eba41a5e | 2618 | int old_selector = -1; |
75790251 MB |
2619 | |
2620 | trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); | |
2621 | ||
bf5892a8 MB |
2622 | min_uV += rdev->constraints->uV_offset; |
2623 | max_uV += rdev->constraints->uV_offset; | |
2624 | ||
eba41a5e AL |
2625 | /* |
2626 | * If we can't obtain the old selector there is not enough | |
2627 | * info to call set_voltage_time_sel(). | |
2628 | */ | |
8b7485ef AL |
2629 | if (_regulator_is_enabled(rdev) && |
2630 | rdev->desc->ops->set_voltage_time_sel && | |
eba41a5e AL |
2631 | rdev->desc->ops->get_voltage_sel) { |
2632 | old_selector = rdev->desc->ops->get_voltage_sel(rdev); | |
2633 | if (old_selector < 0) | |
2634 | return old_selector; | |
2635 | } | |
2636 | ||
75790251 | 2637 | if (rdev->desc->ops->set_voltage) { |
7179569a HS |
2638 | ret = _regulator_call_set_voltage(rdev, min_uV, max_uV, |
2639 | &selector); | |
e113d792 MB |
2640 | |
2641 | if (ret >= 0) { | |
2642 | if (rdev->desc->ops->list_voltage) | |
2643 | best_val = rdev->desc->ops->list_voltage(rdev, | |
2644 | selector); | |
2645 | else | |
2646 | best_val = _regulator_get_voltage(rdev); | |
2647 | } | |
2648 | ||
e8eef82b | 2649 | } else if (rdev->desc->ops->set_voltage_sel) { |
9152c36a | 2650 | if (rdev->desc->ops->map_voltage) { |
e843fc46 MB |
2651 | ret = rdev->desc->ops->map_voltage(rdev, min_uV, |
2652 | max_uV); | |
9152c36a AL |
2653 | } else { |
2654 | if (rdev->desc->ops->list_voltage == | |
2655 | regulator_list_voltage_linear) | |
2656 | ret = regulator_map_voltage_linear(rdev, | |
2657 | min_uV, max_uV); | |
36698627 AL |
2658 | else if (rdev->desc->ops->list_voltage == |
2659 | regulator_list_voltage_linear_range) | |
2660 | ret = regulator_map_voltage_linear_range(rdev, | |
2661 | min_uV, max_uV); | |
9152c36a AL |
2662 | else |
2663 | ret = regulator_map_voltage_iterate(rdev, | |
2664 | min_uV, max_uV); | |
2665 | } | |
e8eef82b | 2666 | |
e843fc46 | 2667 | if (ret >= 0) { |
e113d792 MB |
2668 | best_val = rdev->desc->ops->list_voltage(rdev, ret); |
2669 | if (min_uV <= best_val && max_uV >= best_val) { | |
2670 | selector = ret; | |
c66a566a AL |
2671 | if (old_selector == selector) |
2672 | ret = 0; | |
2673 | else | |
7179569a HS |
2674 | ret = _regulator_call_set_voltage_sel( |
2675 | rdev, best_val, selector); | |
e113d792 MB |
2676 | } else { |
2677 | ret = -EINVAL; | |
2678 | } | |
e8eef82b | 2679 | } |
75790251 MB |
2680 | } else { |
2681 | ret = -EINVAL; | |
2682 | } | |
e8eef82b | 2683 | |
eba41a5e | 2684 | /* Call set_voltage_time_sel if successfully obtained old_selector */ |
5b175952 YSB |
2685 | if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 |
2686 | && old_selector != selector) { | |
77af1b26 | 2687 | |
eba41a5e AL |
2688 | delay = rdev->desc->ops->set_voltage_time_sel(rdev, |
2689 | old_selector, selector); | |
2690 | if (delay < 0) { | |
2691 | rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", | |
2692 | delay); | |
2693 | delay = 0; | |
e8eef82b | 2694 | } |
75790251 | 2695 | |
8b96de31 PR |
2696 | /* Insert any necessary delays */ |
2697 | if (delay >= 1000) { | |
2698 | mdelay(delay / 1000); | |
2699 | udelay(delay % 1000); | |
2700 | } else if (delay) { | |
2701 | udelay(delay); | |
2702 | } | |
77af1b26 LW |
2703 | } |
2704 | ||
2f6c797f AL |
2705 | if (ret == 0 && best_val >= 0) { |
2706 | unsigned long data = best_val; | |
2707 | ||
ded06a52 | 2708 | _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, |
2f6c797f AL |
2709 | (void *)data); |
2710 | } | |
ded06a52 | 2711 | |
eba41a5e | 2712 | trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); |
75790251 MB |
2713 | |
2714 | return ret; | |
2715 | } | |
2716 | ||
414c70cb LG |
2717 | /** |
2718 | * regulator_set_voltage - set regulator output voltage | |
2719 | * @regulator: regulator source | |
2720 | * @min_uV: Minimum required voltage in uV | |
2721 | * @max_uV: Maximum acceptable voltage in uV | |
2722 | * | |
2723 | * Sets a voltage regulator to the desired output voltage. This can be set | |
2724 | * during any regulator state. IOW, regulator can be disabled or enabled. | |
2725 | * | |
2726 | * If the regulator is enabled then the voltage will change to the new value | |
2727 | * immediately otherwise if the regulator is disabled the regulator will | |
2728 | * output at the new voltage when enabled. | |
2729 | * | |
2730 | * NOTE: If the regulator is shared between several devices then the lowest | |
2731 | * request voltage that meets the system constraints will be used. | |
69279fb9 | 2732 | * Regulator system constraints must be set for this regulator before |
414c70cb LG |
2733 | * calling this function otherwise this call will fail. |
2734 | */ | |
2735 | int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) | |
2736 | { | |
2737 | struct regulator_dev *rdev = regulator->rdev; | |
95a3c23a | 2738 | int ret = 0; |
92d7a558 | 2739 | int old_min_uV, old_max_uV; |
c00dc359 | 2740 | int current_uV; |
414c70cb LG |
2741 | |
2742 | mutex_lock(&rdev->mutex); | |
2743 | ||
95a3c23a MB |
2744 | /* If we're setting the same range as last time the change |
2745 | * should be a noop (some cpufreq implementations use the same | |
2746 | * voltage for multiple frequencies, for example). | |
2747 | */ | |
2748 | if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) | |
2749 | goto out; | |
2750 | ||
c00dc359 | 2751 | /* If we're trying to set a range that overlaps the current voltage, |
d3fb9800 | 2752 | * return successfully even though the regulator does not support |
c00dc359 BA |
2753 | * changing the voltage. |
2754 | */ | |
2755 | if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { | |
2756 | current_uV = _regulator_get_voltage(rdev); | |
2757 | if (min_uV <= current_uV && current_uV <= max_uV) { | |
2758 | regulator->min_uV = min_uV; | |
2759 | regulator->max_uV = max_uV; | |
2760 | goto out; | |
2761 | } | |
2762 | } | |
2763 | ||
414c70cb | 2764 | /* sanity check */ |
e8eef82b MB |
2765 | if (!rdev->desc->ops->set_voltage && |
2766 | !rdev->desc->ops->set_voltage_sel) { | |
414c70cb LG |
2767 | ret = -EINVAL; |
2768 | goto out; | |
2769 | } | |
2770 | ||
2771 | /* constraints check */ | |
2772 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2773 | if (ret < 0) | |
2774 | goto out; | |
0d25d09d | 2775 | |
92d7a558 PP |
2776 | /* restore original values in case of error */ |
2777 | old_min_uV = regulator->min_uV; | |
2778 | old_max_uV = regulator->max_uV; | |
414c70cb LG |
2779 | regulator->min_uV = min_uV; |
2780 | regulator->max_uV = max_uV; | |
3a93f2a9 | 2781 | |
05fda3b1 TP |
2782 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); |
2783 | if (ret < 0) | |
92d7a558 | 2784 | goto out2; |
05fda3b1 | 2785 | |
75790251 | 2786 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); |
92d7a558 PP |
2787 | if (ret < 0) |
2788 | goto out2; | |
0d25d09d | 2789 | |
414c70cb LG |
2790 | out: |
2791 | mutex_unlock(&rdev->mutex); | |
2792 | return ret; | |
92d7a558 PP |
2793 | out2: |
2794 | regulator->min_uV = old_min_uV; | |
2795 | regulator->max_uV = old_max_uV; | |
2796 | mutex_unlock(&rdev->mutex); | |
414c70cb LG |
2797 | return ret; |
2798 | } | |
2799 | EXPORT_SYMBOL_GPL(regulator_set_voltage); | |
2800 | ||
88cd222b LW |
2801 | /** |
2802 | * regulator_set_voltage_time - get raise/fall time | |
2803 | * @regulator: regulator source | |
2804 | * @old_uV: starting voltage in microvolts | |
2805 | * @new_uV: target voltage in microvolts | |
2806 | * | |
2807 | * Provided with the starting and ending voltage, this function attempts to | |
2808 | * calculate the time in microseconds required to rise or fall to this new | |
2809 | * voltage. | |
2810 | */ | |
2811 | int regulator_set_voltage_time(struct regulator *regulator, | |
2812 | int old_uV, int new_uV) | |
2813 | { | |
272e2315 GX |
2814 | struct regulator_dev *rdev = regulator->rdev; |
2815 | const struct regulator_ops *ops = rdev->desc->ops; | |
88cd222b LW |
2816 | int old_sel = -1; |
2817 | int new_sel = -1; | |
2818 | int voltage; | |
2819 | int i; | |
2820 | ||
2821 | /* Currently requires operations to do this */ | |
2822 | if (!ops->list_voltage || !ops->set_voltage_time_sel | |
2823 | || !rdev->desc->n_voltages) | |
2824 | return -EINVAL; | |
2825 | ||
2826 | for (i = 0; i < rdev->desc->n_voltages; i++) { | |
2827 | /* We only look for exact voltage matches here */ | |
2828 | voltage = regulator_list_voltage(regulator, i); | |
2829 | if (voltage < 0) | |
2830 | return -EINVAL; | |
2831 | if (voltage == 0) | |
2832 | continue; | |
2833 | if (voltage == old_uV) | |
2834 | old_sel = i; | |
2835 | if (voltage == new_uV) | |
2836 | new_sel = i; | |
2837 | } | |
2838 | ||
2839 | if (old_sel < 0 || new_sel < 0) | |
2840 | return -EINVAL; | |
2841 | ||
2842 | return ops->set_voltage_time_sel(rdev, old_sel, new_sel); | |
2843 | } | |
2844 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time); | |
2845 | ||
98a175b6 | 2846 | /** |
296c6566 RD |
2847 | * regulator_set_voltage_time_sel - get raise/fall time |
2848 | * @rdev: regulator source device | |
98a175b6 YSB |
2849 | * @old_selector: selector for starting voltage |
2850 | * @new_selector: selector for target voltage | |
2851 | * | |
2852 | * Provided with the starting and target voltage selectors, this function | |
2853 | * returns time in microseconds required to rise or fall to this new voltage | |
2854 | * | |
f11d08c3 | 2855 | * Drivers providing ramp_delay in regulation_constraints can use this as their |
398715ab | 2856 | * set_voltage_time_sel() operation. |
98a175b6 YSB |
2857 | */ |
2858 | int regulator_set_voltage_time_sel(struct regulator_dev *rdev, | |
2859 | unsigned int old_selector, | |
2860 | unsigned int new_selector) | |
2861 | { | |
398715ab | 2862 | unsigned int ramp_delay = 0; |
f11d08c3 | 2863 | int old_volt, new_volt; |
398715ab AL |
2864 | |
2865 | if (rdev->constraints->ramp_delay) | |
2866 | ramp_delay = rdev->constraints->ramp_delay; | |
2867 | else if (rdev->desc->ramp_delay) | |
2868 | ramp_delay = rdev->desc->ramp_delay; | |
2869 | ||
2870 | if (ramp_delay == 0) { | |
6f0b2c69 | 2871 | rdev_warn(rdev, "ramp_delay not set\n"); |
398715ab | 2872 | return 0; |
6f0b2c69 | 2873 | } |
398715ab | 2874 | |
f11d08c3 AL |
2875 | /* sanity check */ |
2876 | if (!rdev->desc->ops->list_voltage) | |
2877 | return -EINVAL; | |
398715ab | 2878 | |
f11d08c3 AL |
2879 | old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); |
2880 | new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); | |
2881 | ||
2882 | return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); | |
98a175b6 | 2883 | } |
b19dbf71 | 2884 | EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); |
98a175b6 | 2885 | |
606a2562 MB |
2886 | /** |
2887 | * regulator_sync_voltage - re-apply last regulator output voltage | |
2888 | * @regulator: regulator source | |
2889 | * | |
2890 | * Re-apply the last configured voltage. This is intended to be used | |
2891 | * where some external control source the consumer is cooperating with | |
2892 | * has caused the configured voltage to change. | |
2893 | */ | |
2894 | int regulator_sync_voltage(struct regulator *regulator) | |
2895 | { | |
2896 | struct regulator_dev *rdev = regulator->rdev; | |
2897 | int ret, min_uV, max_uV; | |
2898 | ||
2899 | mutex_lock(&rdev->mutex); | |
2900 | ||
2901 | if (!rdev->desc->ops->set_voltage && | |
2902 | !rdev->desc->ops->set_voltage_sel) { | |
2903 | ret = -EINVAL; | |
2904 | goto out; | |
2905 | } | |
2906 | ||
2907 | /* This is only going to work if we've had a voltage configured. */ | |
2908 | if (!regulator->min_uV && !regulator->max_uV) { | |
2909 | ret = -EINVAL; | |
2910 | goto out; | |
2911 | } | |
2912 | ||
2913 | min_uV = regulator->min_uV; | |
2914 | max_uV = regulator->max_uV; | |
2915 | ||
2916 | /* This should be a paranoia check... */ | |
2917 | ret = regulator_check_voltage(rdev, &min_uV, &max_uV); | |
2918 | if (ret < 0) | |
2919 | goto out; | |
2920 | ||
2921 | ret = regulator_check_consumers(rdev, &min_uV, &max_uV); | |
2922 | if (ret < 0) | |
2923 | goto out; | |
2924 | ||
2925 | ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); | |
2926 | ||
2927 | out: | |
2928 | mutex_unlock(&rdev->mutex); | |
2929 | return ret; | |
2930 | } | |
2931 | EXPORT_SYMBOL_GPL(regulator_sync_voltage); | |
2932 | ||
414c70cb LG |
2933 | static int _regulator_get_voltage(struct regulator_dev *rdev) |
2934 | { | |
bf5892a8 | 2935 | int sel, ret; |
476c2d83 MB |
2936 | |
2937 | if (rdev->desc->ops->get_voltage_sel) { | |
2938 | sel = rdev->desc->ops->get_voltage_sel(rdev); | |
2939 | if (sel < 0) | |
2940 | return sel; | |
bf5892a8 | 2941 | ret = rdev->desc->ops->list_voltage(rdev, sel); |
cb220d16 | 2942 | } else if (rdev->desc->ops->get_voltage) { |
bf5892a8 | 2943 | ret = rdev->desc->ops->get_voltage(rdev); |
f7df20ec MB |
2944 | } else if (rdev->desc->ops->list_voltage) { |
2945 | ret = rdev->desc->ops->list_voltage(rdev, 0); | |
5a523605 LD |
2946 | } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { |
2947 | ret = rdev->desc->fixed_uV; | |
e303996e JMC |
2948 | } else if (rdev->supply) { |
2949 | ret = regulator_get_voltage(rdev->supply); | |
cb220d16 | 2950 | } else { |
414c70cb | 2951 | return -EINVAL; |
cb220d16 | 2952 | } |
bf5892a8 | 2953 | |
cb220d16 AL |
2954 | if (ret < 0) |
2955 | return ret; | |
bf5892a8 | 2956 | return ret - rdev->constraints->uV_offset; |
414c70cb LG |
2957 | } |
2958 | ||
2959 | /** | |
2960 | * regulator_get_voltage - get regulator output voltage | |
2961 | * @regulator: regulator source | |
2962 | * | |
2963 | * This returns the current regulator voltage in uV. | |
2964 | * | |
2965 | * NOTE: If the regulator is disabled it will return the voltage value. This | |
2966 | * function should not be used to determine regulator state. | |
2967 | */ | |
2968 | int regulator_get_voltage(struct regulator *regulator) | |
2969 | { | |
2970 | int ret; | |
2971 | ||
2972 | mutex_lock(®ulator->rdev->mutex); | |
2973 | ||
2974 | ret = _regulator_get_voltage(regulator->rdev); | |
2975 | ||
2976 | mutex_unlock(®ulator->rdev->mutex); | |
2977 | ||
2978 | return ret; | |
2979 | } | |
2980 | EXPORT_SYMBOL_GPL(regulator_get_voltage); | |
2981 | ||
2982 | /** | |
2983 | * regulator_set_current_limit - set regulator output current limit | |
2984 | * @regulator: regulator source | |
ce0d10f8 | 2985 | * @min_uA: Minimum supported current in uA |
414c70cb LG |
2986 | * @max_uA: Maximum supported current in uA |
2987 | * | |
2988 | * Sets current sink to the desired output current. This can be set during | |
2989 | * any regulator state. IOW, regulator can be disabled or enabled. | |
2990 | * | |
2991 | * If the regulator is enabled then the current will change to the new value | |
2992 | * immediately otherwise if the regulator is disabled the regulator will | |
2993 | * output at the new current when enabled. | |
2994 | * | |
2995 | * NOTE: Regulator system constraints must be set for this regulator before | |
2996 | * calling this function otherwise this call will fail. | |
2997 | */ | |
2998 | int regulator_set_current_limit(struct regulator *regulator, | |
2999 | int min_uA, int max_uA) | |
3000 | { | |
3001 | struct regulator_dev *rdev = regulator->rdev; | |
3002 | int ret; | |
3003 | ||
3004 | mutex_lock(&rdev->mutex); | |
3005 | ||
3006 | /* sanity check */ | |
3007 | if (!rdev->desc->ops->set_current_limit) { | |
3008 | ret = -EINVAL; | |
3009 | goto out; | |
3010 | } | |
3011 | ||
3012 | /* constraints check */ | |
3013 | ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); | |
3014 | if (ret < 0) | |
3015 | goto out; | |
3016 | ||
3017 | ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); | |
3018 | out: | |
3019 | mutex_unlock(&rdev->mutex); | |
3020 | return ret; | |
3021 | } | |
3022 | EXPORT_SYMBOL_GPL(regulator_set_current_limit); | |
3023 | ||
3024 | static int _regulator_get_current_limit(struct regulator_dev *rdev) | |
3025 | { | |
3026 | int ret; | |
3027 | ||
3028 | mutex_lock(&rdev->mutex); | |
3029 | ||
3030 | /* sanity check */ | |
3031 | if (!rdev->desc->ops->get_current_limit) { | |
3032 | ret = -EINVAL; | |
3033 | goto out; | |
3034 | } | |
3035 | ||
3036 | ret = rdev->desc->ops->get_current_limit(rdev); | |
3037 | out: | |
3038 | mutex_unlock(&rdev->mutex); | |
3039 | return ret; | |
3040 | } | |
3041 | ||
3042 | /** | |
3043 | * regulator_get_current_limit - get regulator output current | |
3044 | * @regulator: regulator source | |
3045 | * | |
3046 | * This returns the current supplied by the specified current sink in uA. | |
3047 | * | |
3048 | * NOTE: If the regulator is disabled it will return the current value. This | |
3049 | * function should not be used to determine regulator state. | |
3050 | */ | |
3051 | int regulator_get_current_limit(struct regulator *regulator) | |
3052 | { | |
3053 | return _regulator_get_current_limit(regulator->rdev); | |
3054 | } | |
3055 | EXPORT_SYMBOL_GPL(regulator_get_current_limit); | |
3056 | ||
3057 | /** | |
3058 | * regulator_set_mode - set regulator operating mode | |
3059 | * @regulator: regulator source | |
3060 | * @mode: operating mode - one of the REGULATOR_MODE constants | |
3061 | * | |
3062 | * Set regulator operating mode to increase regulator efficiency or improve | |
3063 | * regulation performance. | |
3064 | * | |
3065 | * NOTE: Regulator system constraints must be set for this regulator before | |
3066 | * calling this function otherwise this call will fail. | |
3067 | */ | |
3068 | int regulator_set_mode(struct regulator *regulator, unsigned int mode) | |
3069 | { | |
3070 | struct regulator_dev *rdev = regulator->rdev; | |
3071 | int ret; | |
500b4ac9 | 3072 | int regulator_curr_mode; |
414c70cb LG |
3073 | |
3074 | mutex_lock(&rdev->mutex); | |
3075 | ||
3076 | /* sanity check */ | |
3077 | if (!rdev->desc->ops->set_mode) { | |
3078 | ret = -EINVAL; | |
3079 | goto out; | |
3080 | } | |
3081 | ||
500b4ac9 SI |
3082 | /* return if the same mode is requested */ |
3083 | if (rdev->desc->ops->get_mode) { | |
3084 | regulator_curr_mode = rdev->desc->ops->get_mode(rdev); | |
3085 | if (regulator_curr_mode == mode) { | |
3086 | ret = 0; | |
3087 | goto out; | |
3088 | } | |
3089 | } | |
3090 | ||
414c70cb | 3091 | /* constraints check */ |
22c51b47 | 3092 | ret = regulator_mode_constrain(rdev, &mode); |
414c70cb LG |
3093 | if (ret < 0) |
3094 | goto out; | |
3095 | ||
3096 | ret = rdev->desc->ops->set_mode(rdev, mode); | |
3097 | out: | |
3098 | mutex_unlock(&rdev->mutex); | |
3099 | return ret; | |
3100 | } | |
3101 | EXPORT_SYMBOL_GPL(regulator_set_mode); | |
3102 | ||
3103 | static unsigned int _regulator_get_mode(struct regulator_dev *rdev) | |
3104 | { | |
3105 | int ret; | |
3106 | ||
3107 | mutex_lock(&rdev->mutex); | |
3108 | ||
3109 | /* sanity check */ | |
3110 | if (!rdev->desc->ops->get_mode) { | |
3111 | ret = -EINVAL; | |
3112 | goto out; | |
3113 | } | |
3114 | ||
3115 | ret = rdev->desc->ops->get_mode(rdev); | |
3116 | out: | |
3117 | mutex_unlock(&rdev->mutex); | |
3118 | return ret; | |
3119 | } | |
3120 | ||
3121 | /** | |
3122 | * regulator_get_mode - get regulator operating mode | |
3123 | * @regulator: regulator source | |
3124 | * | |
3125 | * Get the current regulator operating mode. | |
3126 | */ | |
3127 | unsigned int regulator_get_mode(struct regulator *regulator) | |
3128 | { | |
3129 | return _regulator_get_mode(regulator->rdev); | |
3130 | } | |
3131 | EXPORT_SYMBOL_GPL(regulator_get_mode); | |
3132 | ||
3133 | /** | |
e39ce48f | 3134 | * regulator_set_load - set regulator load |
414c70cb LG |
3135 | * @regulator: regulator source |
3136 | * @uA_load: load current | |
3137 | * | |
3138 | * Notifies the regulator core of a new device load. This is then used by | |
3139 | * DRMS (if enabled by constraints) to set the most efficient regulator | |
3140 | * operating mode for the new regulator loading. | |
3141 | * | |
3142 | * Consumer devices notify their supply regulator of the maximum power | |
3143 | * they will require (can be taken from device datasheet in the power | |
3144 | * consumption tables) when they change operational status and hence power | |
3145 | * state. Examples of operational state changes that can affect power | |
3146 | * consumption are :- | |
3147 | * | |
3148 | * o Device is opened / closed. | |
3149 | * o Device I/O is about to begin or has just finished. | |
3150 | * o Device is idling in between work. | |
3151 | * | |
3152 | * This information is also exported via sysfs to userspace. | |
3153 | * | |
3154 | * DRMS will sum the total requested load on the regulator and change | |
3155 | * to the most efficient operating mode if platform constraints allow. | |
3156 | * | |
e39ce48f | 3157 | * On error a negative errno is returned. |
414c70cb | 3158 | */ |
e39ce48f | 3159 | int regulator_set_load(struct regulator *regulator, int uA_load) |
414c70cb LG |
3160 | { |
3161 | struct regulator_dev *rdev = regulator->rdev; | |
8460ef38 | 3162 | int ret; |
d92d95b6 | 3163 | |
414c70cb | 3164 | mutex_lock(&rdev->mutex); |
414c70cb | 3165 | regulator->uA_load = uA_load; |
8460ef38 | 3166 | ret = drms_uA_update(rdev); |
414c70cb | 3167 | mutex_unlock(&rdev->mutex); |
8460ef38 | 3168 | |
414c70cb LG |
3169 | return ret; |
3170 | } | |
e39ce48f | 3171 | EXPORT_SYMBOL_GPL(regulator_set_load); |
414c70cb | 3172 | |
f59c8f9f MB |
3173 | /** |
3174 | * regulator_allow_bypass - allow the regulator to go into bypass mode | |
3175 | * | |
3176 | * @regulator: Regulator to configure | |
9345dfb8 | 3177 | * @enable: enable or disable bypass mode |
f59c8f9f MB |
3178 | * |
3179 | * Allow the regulator to go into bypass mode if all other consumers | |
3180 | * for the regulator also enable bypass mode and the machine | |
3181 | * constraints allow this. Bypass mode means that the regulator is | |
3182 | * simply passing the input directly to the output with no regulation. | |
3183 | */ | |
3184 | int regulator_allow_bypass(struct regulator *regulator, bool enable) | |
3185 | { | |
3186 | struct regulator_dev *rdev = regulator->rdev; | |
3187 | int ret = 0; | |
3188 | ||
3189 | if (!rdev->desc->ops->set_bypass) | |
3190 | return 0; | |
3191 | ||
3192 | if (rdev->constraints && | |
3193 | !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) | |
3194 | return 0; | |
3195 | ||
3196 | mutex_lock(&rdev->mutex); | |
3197 | ||
3198 | if (enable && !regulator->bypass) { | |
3199 | rdev->bypass_count++; | |
3200 | ||
3201 | if (rdev->bypass_count == rdev->open_count) { | |
3202 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3203 | if (ret != 0) | |
3204 | rdev->bypass_count--; | |
3205 | } | |
3206 | ||
3207 | } else if (!enable && regulator->bypass) { | |
3208 | rdev->bypass_count--; | |
3209 | ||
3210 | if (rdev->bypass_count != rdev->open_count) { | |
3211 | ret = rdev->desc->ops->set_bypass(rdev, enable); | |
3212 | if (ret != 0) | |
3213 | rdev->bypass_count++; | |
3214 | } | |
3215 | } | |
3216 | ||
3217 | if (ret == 0) | |
3218 | regulator->bypass = enable; | |
3219 | ||
3220 | mutex_unlock(&rdev->mutex); | |
3221 | ||
3222 | return ret; | |
3223 | } | |
3224 | EXPORT_SYMBOL_GPL(regulator_allow_bypass); | |
3225 | ||
414c70cb LG |
3226 | /** |
3227 | * regulator_register_notifier - register regulator event notifier | |
3228 | * @regulator: regulator source | |
69279fb9 | 3229 | * @nb: notifier block |
414c70cb LG |
3230 | * |
3231 | * Register notifier block to receive regulator events. | |
3232 | */ | |
3233 | int regulator_register_notifier(struct regulator *regulator, | |
3234 | struct notifier_block *nb) | |
3235 | { | |
3236 | return blocking_notifier_chain_register(®ulator->rdev->notifier, | |
3237 | nb); | |
3238 | } | |
3239 | EXPORT_SYMBOL_GPL(regulator_register_notifier); | |
3240 | ||
3241 | /** | |
3242 | * regulator_unregister_notifier - unregister regulator event notifier | |
3243 | * @regulator: regulator source | |
69279fb9 | 3244 | * @nb: notifier block |
414c70cb LG |
3245 | * |
3246 | * Unregister regulator event notifier block. | |
3247 | */ | |
3248 | int regulator_unregister_notifier(struct regulator *regulator, | |
3249 | struct notifier_block *nb) | |
3250 | { | |
3251 | return blocking_notifier_chain_unregister(®ulator->rdev->notifier, | |
3252 | nb); | |
3253 | } | |
3254 | EXPORT_SYMBOL_GPL(regulator_unregister_notifier); | |
3255 | ||
b136fb44 JC |
3256 | /* notify regulator consumers and downstream regulator consumers. |
3257 | * Note mutex must be held by caller. | |
3258 | */ | |
7179569a | 3259 | static int _notifier_call_chain(struct regulator_dev *rdev, |
414c70cb LG |
3260 | unsigned long event, void *data) |
3261 | { | |
414c70cb | 3262 | /* call rdev chain first */ |
7179569a | 3263 | return blocking_notifier_call_chain(&rdev->notifier, event, data); |
414c70cb LG |
3264 | } |
3265 | ||
3266 | /** | |
3267 | * regulator_bulk_get - get multiple regulator consumers | |
3268 | * | |
3269 | * @dev: Device to supply | |
3270 | * @num_consumers: Number of consumers to register | |
3271 | * @consumers: Configuration of consumers; clients are stored here. | |
3272 | * | |
3273 | * @return 0 on success, an errno on failure. | |
3274 | * | |
3275 | * This helper function allows drivers to get several regulator | |
3276 | * consumers in one operation. If any of the regulators cannot be | |
3277 | * acquired then any regulators that were allocated will be freed | |
3278 | * before returning to the caller. | |
3279 | */ | |
3280 | int regulator_bulk_get(struct device *dev, int num_consumers, | |
3281 | struct regulator_bulk_data *consumers) | |
3282 | { | |
3283 | int i; | |
3284 | int ret; | |
3285 | ||
3286 | for (i = 0; i < num_consumers; i++) | |
3287 | consumers[i].consumer = NULL; | |
3288 | ||
3289 | for (i = 0; i < num_consumers; i++) { | |
3290 | consumers[i].consumer = regulator_get(dev, | |
3291 | consumers[i].supply); | |
3292 | if (IS_ERR(consumers[i].consumer)) { | |
414c70cb | 3293 | ret = PTR_ERR(consumers[i].consumer); |
5b307627 MB |
3294 | dev_err(dev, "Failed to get supply '%s': %d\n", |
3295 | consumers[i].supply, ret); | |
414c70cb LG |
3296 | consumers[i].consumer = NULL; |
3297 | goto err; | |
3298 | } | |
3299 | } | |
3300 | ||
3301 | return 0; | |
3302 | ||
3303 | err: | |
b29c7690 | 3304 | while (--i >= 0) |
414c70cb LG |
3305 | regulator_put(consumers[i].consumer); |
3306 | ||
3307 | return ret; | |
3308 | } | |
3309 | EXPORT_SYMBOL_GPL(regulator_bulk_get); | |
3310 | ||
f21e0e81 MB |
3311 | static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) |
3312 | { | |
3313 | struct regulator_bulk_data *bulk = data; | |
3314 | ||
3315 | bulk->ret = regulator_enable(bulk->consumer); | |
3316 | } | |
3317 | ||
414c70cb LG |
3318 | /** |
3319 | * regulator_bulk_enable - enable multiple regulator consumers | |
3320 | * | |
3321 | * @num_consumers: Number of consumers | |
3322 | * @consumers: Consumer data; clients are stored here. | |
3323 | * @return 0 on success, an errno on failure | |
3324 | * | |
3325 | * This convenience API allows consumers to enable multiple regulator | |
3326 | * clients in a single API call. If any consumers cannot be enabled | |
3327 | * then any others that were enabled will be disabled again prior to | |
3328 | * return. | |
3329 | */ | |
3330 | int regulator_bulk_enable(int num_consumers, | |
3331 | struct regulator_bulk_data *consumers) | |
3332 | { | |
2955b47d | 3333 | ASYNC_DOMAIN_EXCLUSIVE(async_domain); |
414c70cb | 3334 | int i; |
f21e0e81 | 3335 | int ret = 0; |
414c70cb | 3336 | |
6492bc1b MB |
3337 | for (i = 0; i < num_consumers; i++) { |
3338 | if (consumers[i].consumer->always_on) | |
3339 | consumers[i].ret = 0; | |
3340 | else | |
3341 | async_schedule_domain(regulator_bulk_enable_async, | |
3342 | &consumers[i], &async_domain); | |
3343 | } | |
f21e0e81 MB |
3344 | |
3345 | async_synchronize_full_domain(&async_domain); | |
3346 | ||
3347 | /* If any consumer failed we need to unwind any that succeeded */ | |
414c70cb | 3348 | for (i = 0; i < num_consumers; i++) { |
f21e0e81 MB |
3349 | if (consumers[i].ret != 0) { |
3350 | ret = consumers[i].ret; | |
414c70cb | 3351 | goto err; |
f21e0e81 | 3352 | } |
414c70cb LG |
3353 | } |
3354 | ||
3355 | return 0; | |
3356 | ||
3357 | err: | |
fbe31057 AH |
3358 | for (i = 0; i < num_consumers; i++) { |
3359 | if (consumers[i].ret < 0) | |
3360 | pr_err("Failed to enable %s: %d\n", consumers[i].supply, | |
3361 | consumers[i].ret); | |
3362 | else | |
3363 | regulator_disable(consumers[i].consumer); | |
3364 | } | |
414c70cb LG |
3365 | |
3366 | return ret; | |
3367 | } | |
3368 | EXPORT_SYMBOL_GPL(regulator_bulk_enable); | |
3369 | ||
3370 | /** | |
3371 | * regulator_bulk_disable - disable multiple regulator consumers | |
3372 | * | |
3373 | * @num_consumers: Number of consumers | |
3374 | * @consumers: Consumer data; clients are stored here. | |
3375 | * @return 0 on success, an errno on failure | |
3376 | * | |
3377 | * This convenience API allows consumers to disable multiple regulator | |
49e22632 SN |
3378 | * clients in a single API call. If any consumers cannot be disabled |
3379 | * then any others that were disabled will be enabled again prior to | |
414c70cb LG |
3380 | * return. |
3381 | */ | |
3382 | int regulator_bulk_disable(int num_consumers, | |
3383 | struct regulator_bulk_data *consumers) | |
3384 | { | |
3385 | int i; | |
01e86f49 | 3386 | int ret, r; |
414c70cb | 3387 | |
49e22632 | 3388 | for (i = num_consumers - 1; i >= 0; --i) { |
414c70cb LG |
3389 | ret = regulator_disable(consumers[i].consumer); |
3390 | if (ret != 0) | |
3391 | goto err; | |
3392 | } | |
3393 | ||
3394 | return 0; | |
3395 | ||
3396 | err: | |
5da84fd9 | 3397 | pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); |
01e86f49 MB |
3398 | for (++i; i < num_consumers; ++i) { |
3399 | r = regulator_enable(consumers[i].consumer); | |
3400 | if (r != 0) | |
3401 | pr_err("Failed to reename %s: %d\n", | |
3402 | consumers[i].supply, r); | |
3403 | } | |
414c70cb LG |
3404 | |
3405 | return ret; | |
3406 | } | |
3407 | EXPORT_SYMBOL_GPL(regulator_bulk_disable); | |
3408 | ||
e1de2f42 DK |
3409 | /** |
3410 | * regulator_bulk_force_disable - force disable multiple regulator consumers | |
3411 | * | |
3412 | * @num_consumers: Number of consumers | |
3413 | * @consumers: Consumer data; clients are stored here. | |
3414 | * @return 0 on success, an errno on failure | |
3415 | * | |
3416 | * This convenience API allows consumers to forcibly disable multiple regulator | |
3417 | * clients in a single API call. | |
3418 | * NOTE: This should be used for situations when device damage will | |
3419 | * likely occur if the regulators are not disabled (e.g. over temp). | |
3420 | * Although regulator_force_disable function call for some consumers can | |
3421 | * return error numbers, the function is called for all consumers. | |
3422 | */ | |
3423 | int regulator_bulk_force_disable(int num_consumers, | |
3424 | struct regulator_bulk_data *consumers) | |
3425 | { | |
3426 | int i; | |
3427 | int ret; | |
3428 | ||
3429 | for (i = 0; i < num_consumers; i++) | |
3430 | consumers[i].ret = | |
3431 | regulator_force_disable(consumers[i].consumer); | |
3432 | ||
3433 | for (i = 0; i < num_consumers; i++) { | |
3434 | if (consumers[i].ret != 0) { | |
3435 | ret = consumers[i].ret; | |
3436 | goto out; | |
3437 | } | |
3438 | } | |
3439 | ||
3440 | return 0; | |
3441 | out: | |
3442 | return ret; | |
3443 | } | |
3444 | EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); | |
3445 | ||
414c70cb LG |
3446 | /** |
3447 | * regulator_bulk_free - free multiple regulator consumers | |
3448 | * | |
3449 | * @num_consumers: Number of consumers | |
3450 | * @consumers: Consumer data; clients are stored here. | |
3451 | * | |
3452 | * This convenience API allows consumers to free multiple regulator | |
3453 | * clients in a single API call. | |
3454 | */ | |
3455 | void regulator_bulk_free(int num_consumers, | |
3456 | struct regulator_bulk_data *consumers) | |
3457 | { | |
3458 | int i; | |
3459 | ||
3460 | for (i = 0; i < num_consumers; i++) { | |
3461 | regulator_put(consumers[i].consumer); | |
3462 | consumers[i].consumer = NULL; | |
3463 | } | |
3464 | } | |
3465 | EXPORT_SYMBOL_GPL(regulator_bulk_free); | |
3466 | ||
3467 | /** | |
3468 | * regulator_notifier_call_chain - call regulator event notifier | |
69279fb9 | 3469 | * @rdev: regulator source |
414c70cb | 3470 | * @event: notifier block |
69279fb9 | 3471 | * @data: callback-specific data. |
414c70cb LG |
3472 | * |
3473 | * Called by regulator drivers to notify clients a regulator event has | |
3474 | * occurred. We also notify regulator clients downstream. | |
b136fb44 | 3475 | * Note lock must be held by caller. |
414c70cb LG |
3476 | */ |
3477 | int regulator_notifier_call_chain(struct regulator_dev *rdev, | |
3478 | unsigned long event, void *data) | |
3479 | { | |
70cfef26 KK |
3480 | lockdep_assert_held_once(&rdev->mutex); |
3481 | ||
414c70cb LG |
3482 | _notifier_call_chain(rdev, event, data); |
3483 | return NOTIFY_DONE; | |
3484 | ||
3485 | } | |
3486 | EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); | |
3487 | ||
be721979 MB |
3488 | /** |
3489 | * regulator_mode_to_status - convert a regulator mode into a status | |
3490 | * | |
3491 | * @mode: Mode to convert | |
3492 | * | |
3493 | * Convert a regulator mode into a status. | |
3494 | */ | |
3495 | int regulator_mode_to_status(unsigned int mode) | |
3496 | { | |
3497 | switch (mode) { | |
3498 | case REGULATOR_MODE_FAST: | |
3499 | return REGULATOR_STATUS_FAST; | |
3500 | case REGULATOR_MODE_NORMAL: | |
3501 | return REGULATOR_STATUS_NORMAL; | |
3502 | case REGULATOR_MODE_IDLE: | |
3503 | return REGULATOR_STATUS_IDLE; | |
03ffcf3d | 3504 | case REGULATOR_MODE_STANDBY: |
be721979 MB |
3505 | return REGULATOR_STATUS_STANDBY; |
3506 | default: | |
1beaf762 | 3507 | return REGULATOR_STATUS_UNDEFINED; |
be721979 MB |
3508 | } |
3509 | } | |
3510 | EXPORT_SYMBOL_GPL(regulator_mode_to_status); | |
3511 | ||
39f802d6 TI |
3512 | static struct attribute *regulator_dev_attrs[] = { |
3513 | &dev_attr_name.attr, | |
3514 | &dev_attr_num_users.attr, | |
3515 | &dev_attr_type.attr, | |
3516 | &dev_attr_microvolts.attr, | |
3517 | &dev_attr_microamps.attr, | |
3518 | &dev_attr_opmode.attr, | |
3519 | &dev_attr_state.attr, | |
3520 | &dev_attr_status.attr, | |
3521 | &dev_attr_bypass.attr, | |
3522 | &dev_attr_requested_microamps.attr, | |
3523 | &dev_attr_min_microvolts.attr, | |
3524 | &dev_attr_max_microvolts.attr, | |
3525 | &dev_attr_min_microamps.attr, | |
3526 | &dev_attr_max_microamps.attr, | |
3527 | &dev_attr_suspend_standby_state.attr, | |
3528 | &dev_attr_suspend_mem_state.attr, | |
3529 | &dev_attr_suspend_disk_state.attr, | |
3530 | &dev_attr_suspend_standby_microvolts.attr, | |
3531 | &dev_attr_suspend_mem_microvolts.attr, | |
3532 | &dev_attr_suspend_disk_microvolts.attr, | |
3533 | &dev_attr_suspend_standby_mode.attr, | |
3534 | &dev_attr_suspend_mem_mode.attr, | |
3535 | &dev_attr_suspend_disk_mode.attr, | |
3536 | NULL | |
3537 | }; | |
3538 | ||
7ad68e2f DB |
3539 | /* |
3540 | * To avoid cluttering sysfs (and memory) with useless state, only | |
3541 | * create attributes that can be meaningfully displayed. | |
3542 | */ | |
39f802d6 TI |
3543 | static umode_t regulator_attr_is_visible(struct kobject *kobj, |
3544 | struct attribute *attr, int idx) | |
7ad68e2f | 3545 | { |
39f802d6 TI |
3546 | struct device *dev = kobj_to_dev(kobj); |
3547 | struct regulator_dev *rdev = container_of(dev, struct regulator_dev, dev); | |
272e2315 | 3548 | const struct regulator_ops *ops = rdev->desc->ops; |
39f802d6 TI |
3549 | umode_t mode = attr->mode; |
3550 | ||
3551 | /* these three are always present */ | |
3552 | if (attr == &dev_attr_name.attr || | |
3553 | attr == &dev_attr_num_users.attr || | |
3554 | attr == &dev_attr_type.attr) | |
3555 | return mode; | |
7ad68e2f DB |
3556 | |
3557 | /* some attributes need specific methods to be displayed */ | |
39f802d6 TI |
3558 | if (attr == &dev_attr_microvolts.attr) { |
3559 | if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || | |
3560 | (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || | |
3561 | (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || | |
3562 | (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)) | |
3563 | return mode; | |
3564 | return 0; | |
f59c8f9f | 3565 | } |
7ad68e2f | 3566 | |
39f802d6 TI |
3567 | if (attr == &dev_attr_microamps.attr) |
3568 | return ops->get_current_limit ? mode : 0; | |
3569 | ||
3570 | if (attr == &dev_attr_opmode.attr) | |
3571 | return ops->get_mode ? mode : 0; | |
3572 | ||
3573 | if (attr == &dev_attr_state.attr) | |
3574 | return (rdev->ena_pin || ops->is_enabled) ? mode : 0; | |
3575 | ||
3576 | if (attr == &dev_attr_status.attr) | |
3577 | return ops->get_status ? mode : 0; | |
3578 | ||
3579 | if (attr == &dev_attr_bypass.attr) | |
3580 | return ops->get_bypass ? mode : 0; | |
3581 | ||
7ad68e2f | 3582 | /* some attributes are type-specific */ |
39f802d6 TI |
3583 | if (attr == &dev_attr_requested_microamps.attr) |
3584 | return rdev->desc->type == REGULATOR_CURRENT ? mode : 0; | |
7ad68e2f | 3585 | |
7ad68e2f | 3586 | /* constraints need specific supporting methods */ |
39f802d6 TI |
3587 | if (attr == &dev_attr_min_microvolts.attr || |
3588 | attr == &dev_attr_max_microvolts.attr) | |
3589 | return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0; | |
3590 | ||
3591 | if (attr == &dev_attr_min_microamps.attr || | |
3592 | attr == &dev_attr_max_microamps.attr) | |
3593 | return ops->set_current_limit ? mode : 0; | |
3594 | ||
3595 | if (attr == &dev_attr_suspend_standby_state.attr || | |
3596 | attr == &dev_attr_suspend_mem_state.attr || | |
3597 | attr == &dev_attr_suspend_disk_state.attr) | |
3598 | return mode; | |
3599 | ||
3600 | if (attr == &dev_attr_suspend_standby_microvolts.attr || | |
3601 | attr == &dev_attr_suspend_mem_microvolts.attr || | |
3602 | attr == &dev_attr_suspend_disk_microvolts.attr) | |
3603 | return ops->set_suspend_voltage ? mode : 0; | |
3604 | ||
3605 | if (attr == &dev_attr_suspend_standby_mode.attr || | |
3606 | attr == &dev_attr_suspend_mem_mode.attr || | |
3607 | attr == &dev_attr_suspend_disk_mode.attr) | |
3608 | return ops->set_suspend_mode ? mode : 0; | |
3609 | ||
3610 | return mode; | |
3611 | } | |
3612 | ||
3613 | static const struct attribute_group regulator_dev_group = { | |
3614 | .attrs = regulator_dev_attrs, | |
3615 | .is_visible = regulator_attr_is_visible, | |
3616 | }; | |
3617 | ||
3618 | static const struct attribute_group *regulator_dev_groups[] = { | |
3619 | ®ulator_dev_group, | |
3620 | NULL | |
3621 | }; | |
7ad68e2f | 3622 | |
39f802d6 TI |
3623 | static void regulator_dev_release(struct device *dev) |
3624 | { | |
3625 | struct regulator_dev *rdev = dev_get_drvdata(dev); | |
29f5f486 MB |
3626 | |
3627 | kfree(rdev->constraints); | |
3628 | of_node_put(rdev->dev.of_node); | |
39f802d6 | 3629 | kfree(rdev); |
7ad68e2f DB |
3630 | } |
3631 | ||
39f802d6 TI |
3632 | static struct class regulator_class = { |
3633 | .name = "regulator", | |
3634 | .dev_release = regulator_dev_release, | |
3635 | .dev_groups = regulator_dev_groups, | |
3636 | }; | |
3637 | ||
1130e5b3 MB |
3638 | static void rdev_init_debugfs(struct regulator_dev *rdev) |
3639 | { | |
a9eaa813 GR |
3640 | struct device *parent = rdev->dev.parent; |
3641 | const char *rname = rdev_get_name(rdev); | |
3642 | char name[NAME_MAX]; | |
3643 | ||
3644 | /* Avoid duplicate debugfs directory names */ | |
3645 | if (parent && rname == rdev->desc->name) { | |
3646 | snprintf(name, sizeof(name), "%s-%s", dev_name(parent), | |
3647 | rname); | |
3648 | rname = name; | |
3649 | } | |
3650 | ||
3651 | rdev->debugfs = debugfs_create_dir(rname, debugfs_root); | |
24751434 | 3652 | if (!rdev->debugfs) { |
1130e5b3 | 3653 | rdev_warn(rdev, "Failed to create debugfs directory\n"); |
1130e5b3 MB |
3654 | return; |
3655 | } | |
3656 | ||
3657 | debugfs_create_u32("use_count", 0444, rdev->debugfs, | |
3658 | &rdev->use_count); | |
3659 | debugfs_create_u32("open_count", 0444, rdev->debugfs, | |
3660 | &rdev->open_count); | |
f59c8f9f MB |
3661 | debugfs_create_u32("bypass_count", 0444, rdev->debugfs, |
3662 | &rdev->bypass_count); | |
1130e5b3 MB |
3663 | } |
3664 | ||
414c70cb LG |
3665 | /** |
3666 | * regulator_register - register regulator | |
69279fb9 | 3667 | * @regulator_desc: regulator to register |
f47531b1 | 3668 | * @cfg: runtime configuration for regulator |
414c70cb LG |
3669 | * |
3670 | * Called by regulator drivers to register a regulator. | |
0384618a AL |
3671 | * Returns a valid pointer to struct regulator_dev on success |
3672 | * or an ERR_PTR() on error. | |
414c70cb | 3673 | */ |
65f26846 MB |
3674 | struct regulator_dev * |
3675 | regulator_register(const struct regulator_desc *regulator_desc, | |
1b3de223 | 3676 | const struct regulator_config *cfg) |
414c70cb | 3677 | { |
9a8f5e07 | 3678 | const struct regulation_constraints *constraints = NULL; |
c172708d | 3679 | const struct regulator_init_data *init_data; |
1b3de223 | 3680 | struct regulator_config *config = NULL; |
72dca06f | 3681 | static atomic_t regulator_no = ATOMIC_INIT(-1); |
414c70cb | 3682 | struct regulator_dev *rdev; |
32c8fad4 | 3683 | struct device *dev; |
a5766f11 | 3684 | int ret, i; |
414c70cb | 3685 | |
1b3de223 | 3686 | if (regulator_desc == NULL || cfg == NULL) |
414c70cb LG |
3687 | return ERR_PTR(-EINVAL); |
3688 | ||
1b3de223 | 3689 | dev = cfg->dev; |
dcf70112 | 3690 | WARN_ON(!dev); |
32c8fad4 | 3691 | |
414c70cb LG |
3692 | if (regulator_desc->name == NULL || regulator_desc->ops == NULL) |
3693 | return ERR_PTR(-EINVAL); | |
3694 | ||
cd78dfc6 DL |
3695 | if (regulator_desc->type != REGULATOR_VOLTAGE && |
3696 | regulator_desc->type != REGULATOR_CURRENT) | |
414c70cb LG |
3697 | return ERR_PTR(-EINVAL); |
3698 | ||
476c2d83 MB |
3699 | /* Only one of each should be implemented */ |
3700 | WARN_ON(regulator_desc->ops->get_voltage && | |
3701 | regulator_desc->ops->get_voltage_sel); | |
e8eef82b MB |
3702 | WARN_ON(regulator_desc->ops->set_voltage && |
3703 | regulator_desc->ops->set_voltage_sel); | |
476c2d83 MB |
3704 | |
3705 | /* If we're using selectors we must implement list_voltage. */ | |
3706 | if (regulator_desc->ops->get_voltage_sel && | |
3707 | !regulator_desc->ops->list_voltage) { | |
3708 | return ERR_PTR(-EINVAL); | |
3709 | } | |
e8eef82b MB |
3710 | if (regulator_desc->ops->set_voltage_sel && |
3711 | !regulator_desc->ops->list_voltage) { | |
3712 | return ERR_PTR(-EINVAL); | |
3713 | } | |
476c2d83 | 3714 | |
414c70cb LG |
3715 | rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); |
3716 | if (rdev == NULL) | |
3717 | return ERR_PTR(-ENOMEM); | |
3718 | ||
1b3de223 KK |
3719 | /* |
3720 | * Duplicate the config so the driver could override it after | |
3721 | * parsing init data. | |
3722 | */ | |
3723 | config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); | |
3724 | if (config == NULL) { | |
3725 | kfree(rdev); | |
3726 | return ERR_PTR(-ENOMEM); | |
3727 | } | |
3728 | ||
bfa21a0d | 3729 | init_data = regulator_of_get_init_data(dev, regulator_desc, config, |
a0c7b164 MB |
3730 | &rdev->dev.of_node); |
3731 | if (!init_data) { | |
3732 | init_data = config->init_data; | |
3733 | rdev->dev.of_node = of_node_get(config->of_node); | |
3734 | } | |
3735 | ||
414c70cb LG |
3736 | mutex_lock(®ulator_list_mutex); |
3737 | ||
3738 | mutex_init(&rdev->mutex); | |
c172708d | 3739 | rdev->reg_data = config->driver_data; |
414c70cb LG |
3740 | rdev->owner = regulator_desc->owner; |
3741 | rdev->desc = regulator_desc; | |
3a4b0a07 MB |
3742 | if (config->regmap) |
3743 | rdev->regmap = config->regmap; | |
52b84dac | 3744 | else if (dev_get_regmap(dev, NULL)) |
3a4b0a07 | 3745 | rdev->regmap = dev_get_regmap(dev, NULL); |
52b84dac AC |
3746 | else if (dev->parent) |
3747 | rdev->regmap = dev_get_regmap(dev->parent, NULL); | |
414c70cb | 3748 | INIT_LIST_HEAD(&rdev->consumer_list); |
414c70cb | 3749 | INIT_LIST_HEAD(&rdev->list); |
414c70cb | 3750 | BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); |
da07ecd9 | 3751 | INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); |
414c70cb | 3752 | |
a5766f11 | 3753 | /* preform any regulator specific init */ |
9a8f5e07 | 3754 | if (init_data && init_data->regulator_init) { |
a5766f11 | 3755 | ret = init_data->regulator_init(rdev->reg_data); |
4fca9545 DB |
3756 | if (ret < 0) |
3757 | goto clean; | |
a5766f11 LG |
3758 | } |
3759 | ||
a5766f11 | 3760 | /* register with sysfs */ |
414c70cb | 3761 | rdev->dev.class = ®ulator_class; |
a5766f11 | 3762 | rdev->dev.parent = dev; |
72dca06f | 3763 | dev_set_name(&rdev->dev, "regulator.%lu", |
39138818 | 3764 | (unsigned long) atomic_inc_return(®ulator_no)); |
a5766f11 | 3765 | ret = device_register(&rdev->dev); |
ad7725cb VK |
3766 | if (ret != 0) { |
3767 | put_device(&rdev->dev); | |
4fca9545 | 3768 | goto clean; |
ad7725cb | 3769 | } |
a5766f11 LG |
3770 | |
3771 | dev_set_drvdata(&rdev->dev, rdev); | |
3772 | ||
76f439df MP |
3773 | if ((config->ena_gpio || config->ena_gpio_initialized) && |
3774 | gpio_is_valid(config->ena_gpio)) { | |
f19b00da | 3775 | ret = regulator_ena_gpio_request(rdev, config); |
65f73508 MB |
3776 | if (ret != 0) { |
3777 | rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", | |
3778 | config->ena_gpio, ret); | |
b2da55d9 | 3779 | goto wash; |
65f73508 | 3780 | } |
65f73508 MB |
3781 | } |
3782 | ||
74f544c1 | 3783 | /* set regulator constraints */ |
9a8f5e07 MB |
3784 | if (init_data) |
3785 | constraints = &init_data->constraints; | |
3786 | ||
3787 | ret = set_machine_constraints(rdev, constraints); | |
74f544c1 MR |
3788 | if (ret < 0) |
3789 | goto scrub; | |
3790 | ||
9a8f5e07 | 3791 | if (init_data && init_data->supply_regulator) |
6261b06d | 3792 | rdev->supply_name = init_data->supply_regulator; |
69511a45 | 3793 | else if (regulator_desc->supply_name) |
6261b06d | 3794 | rdev->supply_name = regulator_desc->supply_name; |
0178f3e2 | 3795 | |
a5766f11 | 3796 | /* add consumers devices */ |
9a8f5e07 MB |
3797 | if (init_data) { |
3798 | for (i = 0; i < init_data->num_consumer_supplies; i++) { | |
3799 | ret = set_consumer_device_supply(rdev, | |
9a8f5e07 | 3800 | init_data->consumer_supplies[i].dev_name, |
23c2f041 | 3801 | init_data->consumer_supplies[i].supply); |
9a8f5e07 MB |
3802 | if (ret < 0) { |
3803 | dev_err(dev, "Failed to set supply %s\n", | |
3804 | init_data->consumer_supplies[i].supply); | |
3805 | goto unset_supplies; | |
3806 | } | |
23c2f041 | 3807 | } |
414c70cb | 3808 | } |
a5766f11 LG |
3809 | |
3810 | list_add(&rdev->list, ®ulator_list); | |
1130e5b3 MB |
3811 | |
3812 | rdev_init_debugfs(rdev); | |
a5766f11 | 3813 | out: |
414c70cb | 3814 | mutex_unlock(®ulator_list_mutex); |
1b3de223 | 3815 | kfree(config); |
414c70cb | 3816 | return rdev; |
4fca9545 | 3817 | |
d4033b54 JN |
3818 | unset_supplies: |
3819 | unset_regulator_supplies(rdev); | |
3820 | ||
4fca9545 | 3821 | scrub: |
f19b00da | 3822 | regulator_ena_gpio_free(rdev); |
1a6958e7 | 3823 | kfree(rdev->constraints); |
b2da55d9 | 3824 | wash: |
4fca9545 | 3825 | device_unregister(&rdev->dev); |
53032daf PW |
3826 | /* device core frees rdev */ |
3827 | rdev = ERR_PTR(ret); | |
3828 | goto out; | |
3829 | ||
4fca9545 DB |
3830 | clean: |
3831 | kfree(rdev); | |
3832 | rdev = ERR_PTR(ret); | |
3833 | goto out; | |
414c70cb LG |
3834 | } |
3835 | EXPORT_SYMBOL_GPL(regulator_register); | |
3836 | ||
3837 | /** | |
3838 | * regulator_unregister - unregister regulator | |
69279fb9 | 3839 | * @rdev: regulator to unregister |
414c70cb LG |
3840 | * |
3841 | * Called by regulator drivers to unregister a regulator. | |
3842 | */ | |
3843 | void regulator_unregister(struct regulator_dev *rdev) | |
3844 | { | |
3845 | if (rdev == NULL) | |
3846 | return; | |
3847 | ||
891636ea MB |
3848 | if (rdev->supply) { |
3849 | while (rdev->use_count--) | |
3850 | regulator_disable(rdev->supply); | |
e032b376 | 3851 | regulator_put(rdev->supply); |
891636ea | 3852 | } |
414c70cb | 3853 | mutex_lock(®ulator_list_mutex); |
1130e5b3 | 3854 | debugfs_remove_recursive(rdev->debugfs); |
43829731 | 3855 | flush_work(&rdev->disable_work.work); |
6bf87d17 | 3856 | WARN_ON(rdev->open_count); |
0f1d747b | 3857 | unset_regulator_supplies(rdev); |
414c70cb | 3858 | list_del(&rdev->list); |
7cd71c3b | 3859 | mutex_unlock(®ulator_list_mutex); |
f19b00da | 3860 | regulator_ena_gpio_free(rdev); |
58fb5cf5 | 3861 | device_unregister(&rdev->dev); |
414c70cb LG |
3862 | } |
3863 | EXPORT_SYMBOL_GPL(regulator_unregister); | |
3864 | ||
414c70cb | 3865 | /** |
cf7bbcdf | 3866 | * regulator_suspend_prepare - prepare regulators for system wide suspend |
414c70cb LG |
3867 | * @state: system suspend state |
3868 | * | |
3869 | * Configure each regulator with it's suspend operating parameters for state. | |
3870 | * This will usually be called by machine suspend code prior to supending. | |
3871 | */ | |
3872 | int regulator_suspend_prepare(suspend_state_t state) | |
3873 | { | |
3874 | struct regulator_dev *rdev; | |
3875 | int ret = 0; | |
3876 | ||
3877 | /* ON is handled by regulator active state */ | |
3878 | if (state == PM_SUSPEND_ON) | |
3879 | return -EINVAL; | |
3880 | ||
3881 | mutex_lock(®ulator_list_mutex); | |
3882 | list_for_each_entry(rdev, ®ulator_list, list) { | |
3883 | ||
3884 | mutex_lock(&rdev->mutex); | |
3885 | ret = suspend_prepare(rdev, state); | |
3886 | mutex_unlock(&rdev->mutex); | |
3887 | ||
3888 | if (ret < 0) { | |
5da84fd9 | 3889 | rdev_err(rdev, "failed to prepare\n"); |
414c70cb LG |
3890 | goto out; |
3891 | } | |
3892 | } | |
3893 | out: | |
3894 | mutex_unlock(®ulator_list_mutex); | |
3895 | return ret; | |
3896 | } | |
3897 | EXPORT_SYMBOL_GPL(regulator_suspend_prepare); | |
3898 | ||
7a32b589 MH |
3899 | /** |
3900 | * regulator_suspend_finish - resume regulators from system wide suspend | |
3901 | * | |
3902 | * Turn on regulators that might be turned off by regulator_suspend_prepare | |
3903 | * and that should be turned on according to the regulators properties. | |
3904 | */ | |
3905 | int regulator_suspend_finish(void) | |
3906 | { | |
3907 | struct regulator_dev *rdev; | |
3908 | int ret = 0, error; | |
3909 | ||
3910 | mutex_lock(®ulator_list_mutex); | |
3911 | list_for_each_entry(rdev, ®ulator_list, list) { | |
7a32b589 | 3912 | mutex_lock(&rdev->mutex); |
30c21971 | 3913 | if (rdev->use_count > 0 || rdev->constraints->always_on) { |
0548bf4f JMC |
3914 | if (!_regulator_is_enabled(rdev)) { |
3915 | error = _regulator_do_enable(rdev); | |
3916 | if (error) | |
3917 | ret = error; | |
3918 | } | |
7a32b589 | 3919 | } else { |
87b28417 | 3920 | if (!have_full_constraints()) |
7a32b589 | 3921 | goto unlock; |
b1a86831 | 3922 | if (!_regulator_is_enabled(rdev)) |
7a32b589 MH |
3923 | goto unlock; |
3924 | ||
66fda75f | 3925 | error = _regulator_do_disable(rdev); |
7a32b589 MH |
3926 | if (error) |
3927 | ret = error; | |
3928 | } | |
3929 | unlock: | |
3930 | mutex_unlock(&rdev->mutex); | |
3931 | } | |
3932 | mutex_unlock(®ulator_list_mutex); | |
3933 | return ret; | |
3934 | } | |
3935 | EXPORT_SYMBOL_GPL(regulator_suspend_finish); | |
3936 | ||
ca725561 MB |
3937 | /** |
3938 | * regulator_has_full_constraints - the system has fully specified constraints | |
3939 | * | |
3940 | * Calling this function will cause the regulator API to disable all | |
3941 | * regulators which have a zero use count and don't have an always_on | |
3942 | * constraint in a late_initcall. | |
3943 | * | |
3944 | * The intention is that this will become the default behaviour in a | |
3945 | * future kernel release so users are encouraged to use this facility | |
3946 | * now. | |
3947 | */ | |
3948 | void regulator_has_full_constraints(void) | |
3949 | { | |
3950 | has_full_constraints = 1; | |
3951 | } | |
3952 | EXPORT_SYMBOL_GPL(regulator_has_full_constraints); | |
3953 | ||
414c70cb LG |
3954 | /** |
3955 | * rdev_get_drvdata - get rdev regulator driver data | |
69279fb9 | 3956 | * @rdev: regulator |
414c70cb LG |
3957 | * |
3958 | * Get rdev regulator driver private data. This call can be used in the | |
3959 | * regulator driver context. | |
3960 | */ | |
3961 | void *rdev_get_drvdata(struct regulator_dev *rdev) | |
3962 | { | |
3963 | return rdev->reg_data; | |
3964 | } | |
3965 | EXPORT_SYMBOL_GPL(rdev_get_drvdata); | |
3966 | ||
3967 | /** | |
3968 | * regulator_get_drvdata - get regulator driver data | |
3969 | * @regulator: regulator | |
3970 | * | |
3971 | * Get regulator driver private data. This call can be used in the consumer | |
3972 | * driver context when non API regulator specific functions need to be called. | |
3973 | */ | |
3974 | void *regulator_get_drvdata(struct regulator *regulator) | |
3975 | { | |
3976 | return regulator->rdev->reg_data; | |
3977 | } | |
3978 | EXPORT_SYMBOL_GPL(regulator_get_drvdata); | |
3979 | ||
3980 | /** | |
3981 | * regulator_set_drvdata - set regulator driver data | |
3982 | * @regulator: regulator | |
3983 | * @data: data | |
3984 | */ | |
3985 | void regulator_set_drvdata(struct regulator *regulator, void *data) | |
3986 | { | |
3987 | regulator->rdev->reg_data = data; | |
3988 | } | |
3989 | EXPORT_SYMBOL_GPL(regulator_set_drvdata); | |
3990 | ||
3991 | /** | |
3992 | * regulator_get_id - get regulator ID | |
69279fb9 | 3993 | * @rdev: regulator |
414c70cb LG |
3994 | */ |
3995 | int rdev_get_id(struct regulator_dev *rdev) | |
3996 | { | |
3997 | return rdev->desc->id; | |
3998 | } | |
3999 | EXPORT_SYMBOL_GPL(rdev_get_id); | |
4000 | ||
a5766f11 LG |
4001 | struct device *rdev_get_dev(struct regulator_dev *rdev) |
4002 | { | |
4003 | return &rdev->dev; | |
4004 | } | |
4005 | EXPORT_SYMBOL_GPL(rdev_get_dev); | |
4006 | ||
4007 | void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) | |
4008 | { | |
4009 | return reg_init_data->driver_data; | |
4010 | } | |
4011 | EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); | |
4012 | ||
ba55a974 MB |
4013 | #ifdef CONFIG_DEBUG_FS |
4014 | static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, | |
4015 | size_t count, loff_t *ppos) | |
4016 | { | |
4017 | char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
4018 | ssize_t len, ret = 0; | |
4019 | struct regulator_map *map; | |
4020 | ||
4021 | if (!buf) | |
4022 | return -ENOMEM; | |
4023 | ||
4024 | list_for_each_entry(map, ®ulator_map_list, list) { | |
4025 | len = snprintf(buf + ret, PAGE_SIZE - ret, | |
4026 | "%s -> %s.%s\n", | |
4027 | rdev_get_name(map->regulator), map->dev_name, | |
4028 | map->supply); | |
4029 | if (len >= 0) | |
4030 | ret += len; | |
4031 | if (ret > PAGE_SIZE) { | |
4032 | ret = PAGE_SIZE; | |
4033 | break; | |
4034 | } | |
4035 | } | |
4036 | ||
4037 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); | |
4038 | ||
4039 | kfree(buf); | |
4040 | ||
4041 | return ret; | |
4042 | } | |
24751434 | 4043 | #endif |
ba55a974 MB |
4044 | |
4045 | static const struct file_operations supply_map_fops = { | |
24751434 | 4046 | #ifdef CONFIG_DEBUG_FS |
ba55a974 MB |
4047 | .read = supply_map_read_file, |
4048 | .llseek = default_llseek, | |
ba55a974 | 4049 | #endif |
24751434 | 4050 | }; |
ba55a974 | 4051 | |
7c225ec9 HS |
4052 | #ifdef CONFIG_DEBUG_FS |
4053 | static void regulator_summary_show_subtree(struct seq_file *s, | |
4054 | struct regulator_dev *rdev, | |
4055 | int level) | |
4056 | { | |
4057 | struct list_head *list = s->private; | |
4058 | struct regulator_dev *child; | |
4059 | struct regulation_constraints *c; | |
4060 | struct regulator *consumer; | |
4061 | ||
4062 | if (!rdev) | |
4063 | return; | |
4064 | ||
7c225ec9 HS |
4065 | seq_printf(s, "%*s%-*s %3d %4d %6d ", |
4066 | level * 3 + 1, "", | |
4067 | 30 - level * 3, rdev_get_name(rdev), | |
4068 | rdev->use_count, rdev->open_count, rdev->bypass_count); | |
4069 | ||
23296099 HS |
4070 | seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000); |
4071 | seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000); | |
7c225ec9 HS |
4072 | |
4073 | c = rdev->constraints; | |
4074 | if (c) { | |
4075 | switch (rdev->desc->type) { | |
4076 | case REGULATOR_VOLTAGE: | |
4077 | seq_printf(s, "%5dmV %5dmV ", | |
4078 | c->min_uV / 1000, c->max_uV / 1000); | |
4079 | break; | |
4080 | case REGULATOR_CURRENT: | |
4081 | seq_printf(s, "%5dmA %5dmA ", | |
4082 | c->min_uA / 1000, c->max_uA / 1000); | |
4083 | break; | |
4084 | } | |
4085 | } | |
4086 | ||
4087 | seq_puts(s, "\n"); | |
4088 | ||
4089 | list_for_each_entry(consumer, &rdev->consumer_list, list) { | |
4090 | if (consumer->dev->class == ®ulator_class) | |
4091 | continue; | |
4092 | ||
4093 | seq_printf(s, "%*s%-*s ", | |
4094 | (level + 1) * 3 + 1, "", | |
4095 | 30 - (level + 1) * 3, dev_name(consumer->dev)); | |
4096 | ||
4097 | switch (rdev->desc->type) { | |
4098 | case REGULATOR_VOLTAGE: | |
23296099 | 4099 | seq_printf(s, "%37dmV %5dmV", |
7c225ec9 HS |
4100 | consumer->min_uV / 1000, |
4101 | consumer->max_uV / 1000); | |
4102 | break; | |
4103 | case REGULATOR_CURRENT: | |
7c225ec9 HS |
4104 | break; |
4105 | } | |
4106 | ||
4107 | seq_puts(s, "\n"); | |
4108 | } | |
4109 | ||
7c225ec9 HS |
4110 | list_for_each_entry(child, list, list) { |
4111 | /* handle only non-root regulators supplied by current rdev */ | |
4112 | if (!child->supply || child->supply->rdev != rdev) | |
4113 | continue; | |
4114 | ||
4115 | regulator_summary_show_subtree(s, child, level + 1); | |
4116 | } | |
4117 | } | |
4118 | ||
4119 | static int regulator_summary_show(struct seq_file *s, void *data) | |
4120 | { | |
4121 | struct list_head *list = s->private; | |
4122 | struct regulator_dev *rdev; | |
4123 | ||
23296099 HS |
4124 | seq_puts(s, " regulator use open bypass voltage current min max\n"); |
4125 | seq_puts(s, "-------------------------------------------------------------------------------\n"); | |
7c225ec9 HS |
4126 | |
4127 | mutex_lock(®ulator_list_mutex); | |
4128 | ||
4129 | list_for_each_entry(rdev, list, list) { | |
4130 | if (rdev->supply) | |
4131 | continue; | |
4132 | ||
4133 | regulator_summary_show_subtree(s, rdev, 0); | |
4134 | } | |
4135 | ||
4136 | mutex_unlock(®ulator_list_mutex); | |
4137 | ||
4138 | return 0; | |
4139 | } | |
4140 | ||
4141 | static int regulator_summary_open(struct inode *inode, struct file *file) | |
4142 | { | |
4143 | return single_open(file, regulator_summary_show, inode->i_private); | |
4144 | } | |
4145 | #endif | |
4146 | ||
4147 | static const struct file_operations regulator_summary_fops = { | |
4148 | #ifdef CONFIG_DEBUG_FS | |
4149 | .open = regulator_summary_open, | |
4150 | .read = seq_read, | |
4151 | .llseek = seq_lseek, | |
4152 | .release = single_release, | |
4153 | #endif | |
4154 | }; | |
4155 | ||
414c70cb LG |
4156 | static int __init regulator_init(void) |
4157 | { | |
34abbd68 MB |
4158 | int ret; |
4159 | ||
34abbd68 MB |
4160 | ret = class_register(®ulator_class); |
4161 | ||
1130e5b3 | 4162 | debugfs_root = debugfs_create_dir("regulator", NULL); |
24751434 | 4163 | if (!debugfs_root) |
1130e5b3 | 4164 | pr_warn("regulator: Failed to create debugfs directory\n"); |
ba55a974 | 4165 | |
f4d562c6 MB |
4166 | debugfs_create_file("supply_map", 0444, debugfs_root, NULL, |
4167 | &supply_map_fops); | |
1130e5b3 | 4168 | |
7c225ec9 HS |
4169 | debugfs_create_file("regulator_summary", 0444, debugfs_root, |
4170 | ®ulator_list, ®ulator_summary_fops); | |
4171 | ||
34abbd68 MB |
4172 | regulator_dummy_init(); |
4173 | ||
4174 | return ret; | |
414c70cb LG |
4175 | } |
4176 | ||
4177 | /* init early to allow our consumers to complete system booting */ | |
4178 | core_initcall(regulator_init); | |
ca725561 | 4179 | |
609ca5f3 | 4180 | static int __init regulator_late_cleanup(struct device *dev, void *data) |
ca725561 | 4181 | { |
609ca5f3 MB |
4182 | struct regulator_dev *rdev = dev_to_rdev(dev); |
4183 | const struct regulator_ops *ops = rdev->desc->ops; | |
4184 | struct regulation_constraints *c = rdev->constraints; | |
ca725561 | 4185 | int enabled, ret; |
ca725561 | 4186 | |
609ca5f3 MB |
4187 | if (c && c->always_on) |
4188 | return 0; | |
4189 | ||
4190 | if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) | |
4191 | return 0; | |
4192 | ||
4193 | mutex_lock(&rdev->mutex); | |
4194 | ||
4195 | if (rdev->use_count) | |
4196 | goto unlock; | |
4197 | ||
4198 | /* If we can't read the status assume it's on. */ | |
4199 | if (ops->is_enabled) | |
4200 | enabled = ops->is_enabled(rdev); | |
4201 | else | |
4202 | enabled = 1; | |
4203 | ||
4204 | if (!enabled) | |
4205 | goto unlock; | |
4206 | ||
4207 | if (have_full_constraints()) { | |
4208 | /* We log since this may kill the system if it goes | |
4209 | * wrong. */ | |
4210 | rdev_info(rdev, "disabling\n"); | |
4211 | ret = _regulator_do_disable(rdev); | |
4212 | if (ret != 0) | |
4213 | rdev_err(rdev, "couldn't disable: %d\n", ret); | |
4214 | } else { | |
4215 | /* The intention is that in future we will | |
4216 | * assume that full constraints are provided | |
4217 | * so warn even if we aren't going to do | |
4218 | * anything here. | |
4219 | */ | |
4220 | rdev_warn(rdev, "incomplete constraints, leaving on\n"); | |
4221 | } | |
4222 | ||
4223 | unlock: | |
4224 | mutex_unlock(&rdev->mutex); | |
4225 | ||
4226 | return 0; | |
4227 | } | |
4228 | ||
4229 | static int __init regulator_init_complete(void) | |
4230 | { | |
86f5fcfc MB |
4231 | /* |
4232 | * Since DT doesn't provide an idiomatic mechanism for | |
4233 | * enabling full constraints and since it's much more natural | |
4234 | * with DT to provide them just assume that a DT enabled | |
4235 | * system has full constraints. | |
4236 | */ | |
4237 | if (of_have_populated_dt()) | |
4238 | has_full_constraints = true; | |
4239 | ||
ca725561 | 4240 | /* If we have a full configuration then disable any regulators |
e9535834 MB |
4241 | * we have permission to change the status for and which are |
4242 | * not in use or always_on. This is effectively the default | |
4243 | * for DT and ACPI as they have full constraints. | |
ca725561 | 4244 | */ |
609ca5f3 MB |
4245 | class_for_each_device(®ulator_class, NULL, NULL, |
4246 | regulator_late_cleanup); | |
ca725561 MB |
4247 | |
4248 | return 0; | |
4249 | } | |
fd482a3e | 4250 | late_initcall_sync(regulator_init_complete); |