core.c revision 4ddfebd3b0d5b65c69492408bb67fd1202104643
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static LIST_HEAD(regulator_ena_gpio_list); 55static bool has_full_constraints; 56static bool board_wants_dummy_regulator; 57 58static struct dentry *debugfs_root; 59 60/* 61 * struct regulator_map 62 * 63 * Used to provide symbolic supply names to devices. 64 */ 65struct regulator_map { 66 struct list_head list; 67 const char *dev_name; /* The dev_name() for the consumer */ 68 const char *supply; 69 struct regulator_dev *regulator; 70}; 71 72/* 73 * struct regulator_enable_gpio 74 * 75 * Management for shared enable GPIO pin 76 */ 77struct regulator_enable_gpio { 78 struct list_head list; 79 int gpio; 80 u32 enable_count; /* a number of enabled shared GPIO */ 81 u32 request_count; /* a number of requested shared GPIO */ 82 unsigned int ena_gpio_invert:1; 83}; 84 85/* 86 * struct regulator 87 * 88 * One for each consumer device. 89 */ 90struct regulator { 91 struct device *dev; 92 struct list_head list; 93 unsigned int always_on:1; 94 unsigned int bypass:1; 95 int uA_load; 96 int min_uV; 97 int max_uV; 98 char *supply_name; 99 struct device_attribute dev_attr; 100 struct regulator_dev *rdev; 101 struct dentry *debugfs; 102}; 103 104static int _regulator_is_enabled(struct regulator_dev *rdev); 105static int _regulator_disable(struct regulator_dev *rdev); 106static int _regulator_get_voltage(struct regulator_dev *rdev); 107static int _regulator_get_current_limit(struct regulator_dev *rdev); 108static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 109static void _notifier_call_chain(struct regulator_dev *rdev, 110 unsigned long event, void *data); 111static int _regulator_do_set_voltage(struct regulator_dev *rdev, 112 int min_uV, int max_uV); 113static struct regulator *create_regulator(struct regulator_dev *rdev, 114 struct device *dev, 115 const char *supply_name); 116 117static const char *rdev_get_name(struct regulator_dev *rdev) 118{ 119 if (rdev->constraints && rdev->constraints->name) 120 return rdev->constraints->name; 121 else if (rdev->desc->name) 122 return rdev->desc->name; 123 else 124 return ""; 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t name_show(struct device *dev, struct device_attribute *attr, 327 char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333static DEVICE_ATTR_RO(name); 334 335static ssize_t regulator_print_opmode(char *buf, int mode) 336{ 337 switch (mode) { 338 case REGULATOR_MODE_FAST: 339 return sprintf(buf, "fast\n"); 340 case REGULATOR_MODE_NORMAL: 341 return sprintf(buf, "normal\n"); 342 case REGULATOR_MODE_IDLE: 343 return sprintf(buf, "idle\n"); 344 case REGULATOR_MODE_STANDBY: 345 return sprintf(buf, "standby\n"); 346 } 347 return sprintf(buf, "unknown\n"); 348} 349 350static ssize_t regulator_opmode_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352{ 353 struct regulator_dev *rdev = dev_get_drvdata(dev); 354 355 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 356} 357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 358 359static ssize_t regulator_print_state(char *buf, int state) 360{ 361 if (state > 0) 362 return sprintf(buf, "enabled\n"); 363 else if (state == 0) 364 return sprintf(buf, "disabled\n"); 365 else 366 return sprintf(buf, "unknown\n"); 367} 368 369static ssize_t regulator_state_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct regulator_dev *rdev = dev_get_drvdata(dev); 373 ssize_t ret; 374 375 mutex_lock(&rdev->mutex); 376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 377 mutex_unlock(&rdev->mutex); 378 379 return ret; 380} 381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 382 383static ssize_t regulator_status_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 int status; 388 char *label; 389 390 status = rdev->desc->ops->get_status(rdev); 391 if (status < 0) 392 return status; 393 394 switch (status) { 395 case REGULATOR_STATUS_OFF: 396 label = "off"; 397 break; 398 case REGULATOR_STATUS_ON: 399 label = "on"; 400 break; 401 case REGULATOR_STATUS_ERROR: 402 label = "error"; 403 break; 404 case REGULATOR_STATUS_FAST: 405 label = "fast"; 406 break; 407 case REGULATOR_STATUS_NORMAL: 408 label = "normal"; 409 break; 410 case REGULATOR_STATUS_IDLE: 411 label = "idle"; 412 break; 413 case REGULATOR_STATUS_STANDBY: 414 label = "standby"; 415 break; 416 case REGULATOR_STATUS_BYPASS: 417 label = "bypass"; 418 break; 419 case REGULATOR_STATUS_UNDEFINED: 420 label = "undefined"; 421 break; 422 default: 423 return -ERANGE; 424 } 425 426 return sprintf(buf, "%s\n", label); 427} 428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 429 430static ssize_t regulator_min_uA_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432{ 433 struct regulator_dev *rdev = dev_get_drvdata(dev); 434 435 if (!rdev->constraints) 436 return sprintf(buf, "constraint not defined\n"); 437 438 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 439} 440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 441 442static ssize_t regulator_max_uA_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 if (!rdev->constraints) 448 return sprintf(buf, "constraint not defined\n"); 449 450 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 451} 452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 453 454static ssize_t regulator_min_uV_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 if (!rdev->constraints) 460 return sprintf(buf, "constraint not defined\n"); 461 462 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 463} 464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 465 466static ssize_t regulator_max_uV_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468{ 469 struct regulator_dev *rdev = dev_get_drvdata(dev); 470 471 if (!rdev->constraints) 472 return sprintf(buf, "constraint not defined\n"); 473 474 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 475} 476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 477 478static ssize_t regulator_total_uA_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 struct regulator *regulator; 483 int uA = 0; 484 485 mutex_lock(&rdev->mutex); 486 list_for_each_entry(regulator, &rdev->consumer_list, list) 487 uA += regulator->uA_load; 488 mutex_unlock(&rdev->mutex); 489 return sprintf(buf, "%d\n", uA); 490} 491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 492 493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 494 char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 return sprintf(buf, "%d\n", rdev->use_count); 498} 499static DEVICE_ATTR_RO(num_users); 500 501static ssize_t type_show(struct device *dev, struct device_attribute *attr, 502 char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514static DEVICE_ATTR_RO(type); 515 516static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 522} 523static DEVICE_ATTR(suspend_mem_microvolts, 0444, 524 regulator_suspend_mem_uV_show, NULL); 525 526static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 532} 533static DEVICE_ATTR(suspend_disk_microvolts, 0444, 534 regulator_suspend_disk_uV_show, NULL); 535 536static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 struct regulator_dev *rdev = dev_get_drvdata(dev); 540 541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 542} 543static DEVICE_ATTR(suspend_standby_microvolts, 0444, 544 regulator_suspend_standby_uV_show, NULL); 545 546static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 547 struct device_attribute *attr, char *buf) 548{ 549 struct regulator_dev *rdev = dev_get_drvdata(dev); 550 551 return regulator_print_opmode(buf, 552 rdev->constraints->state_mem.mode); 553} 554static DEVICE_ATTR(suspend_mem_mode, 0444, 555 regulator_suspend_mem_mode_show, NULL); 556 557static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 558 struct device_attribute *attr, char *buf) 559{ 560 struct regulator_dev *rdev = dev_get_drvdata(dev); 561 562 return regulator_print_opmode(buf, 563 rdev->constraints->state_disk.mode); 564} 565static DEVICE_ATTR(suspend_disk_mode, 0444, 566 regulator_suspend_disk_mode_show, NULL); 567 568static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 569 struct device_attribute *attr, char *buf) 570{ 571 struct regulator_dev *rdev = dev_get_drvdata(dev); 572 573 return regulator_print_opmode(buf, 574 rdev->constraints->state_standby.mode); 575} 576static DEVICE_ATTR(suspend_standby_mode, 0444, 577 regulator_suspend_standby_mode_show, NULL); 578 579static ssize_t regulator_suspend_mem_state_show(struct device *dev, 580 struct device_attribute *attr, char *buf) 581{ 582 struct regulator_dev *rdev = dev_get_drvdata(dev); 583 584 return regulator_print_state(buf, 585 rdev->constraints->state_mem.enabled); 586} 587static DEVICE_ATTR(suspend_mem_state, 0444, 588 regulator_suspend_mem_state_show, NULL); 589 590static ssize_t regulator_suspend_disk_state_show(struct device *dev, 591 struct device_attribute *attr, char *buf) 592{ 593 struct regulator_dev *rdev = dev_get_drvdata(dev); 594 595 return regulator_print_state(buf, 596 rdev->constraints->state_disk.enabled); 597} 598static DEVICE_ATTR(suspend_disk_state, 0444, 599 regulator_suspend_disk_state_show, NULL); 600 601static ssize_t regulator_suspend_standby_state_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603{ 604 struct regulator_dev *rdev = dev_get_drvdata(dev); 605 606 return regulator_print_state(buf, 607 rdev->constraints->state_standby.enabled); 608} 609static DEVICE_ATTR(suspend_standby_state, 0444, 610 regulator_suspend_standby_state_show, NULL); 611 612static ssize_t regulator_bypass_show(struct device *dev, 613 struct device_attribute *attr, char *buf) 614{ 615 struct regulator_dev *rdev = dev_get_drvdata(dev); 616 const char *report; 617 bool bypass; 618 int ret; 619 620 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 621 622 if (ret != 0) 623 report = "unknown"; 624 else if (bypass) 625 report = "enabled"; 626 else 627 report = "disabled"; 628 629 return sprintf(buf, "%s\n", report); 630} 631static DEVICE_ATTR(bypass, 0444, 632 regulator_bypass_show, NULL); 633 634/* 635 * These are the only attributes are present for all regulators. 636 * Other attributes are a function of regulator functionality. 637 */ 638static struct attribute *regulator_dev_attrs[] = { 639 &dev_attr_name.attr, 640 &dev_attr_num_users.attr, 641 &dev_attr_type.attr, 642 NULL, 643}; 644ATTRIBUTE_GROUPS(regulator_dev); 645 646static void regulator_dev_release(struct device *dev) 647{ 648 struct regulator_dev *rdev = dev_get_drvdata(dev); 649 kfree(rdev); 650} 651 652static struct class regulator_class = { 653 .name = "regulator", 654 .dev_release = regulator_dev_release, 655 .dev_groups = regulator_dev_groups, 656}; 657 658/* Calculate the new optimum regulator operating mode based on the new total 659 * consumer load. All locks held by caller */ 660static void drms_uA_update(struct regulator_dev *rdev) 661{ 662 struct regulator *sibling; 663 int current_uA = 0, output_uV, input_uV, err; 664 unsigned int mode; 665 666 err = regulator_check_drms(rdev); 667 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 668 (!rdev->desc->ops->get_voltage && 669 !rdev->desc->ops->get_voltage_sel) || 670 !rdev->desc->ops->set_mode) 671 return; 672 673 /* get output voltage */ 674 output_uV = _regulator_get_voltage(rdev); 675 if (output_uV <= 0) 676 return; 677 678 /* get input voltage */ 679 input_uV = 0; 680 if (rdev->supply) 681 input_uV = regulator_get_voltage(rdev->supply); 682 if (input_uV <= 0) 683 input_uV = rdev->constraints->input_uV; 684 if (input_uV <= 0) 685 return; 686 687 /* calc total requested load */ 688 list_for_each_entry(sibling, &rdev->consumer_list, list) 689 current_uA += sibling->uA_load; 690 691 /* now get the optimum mode for our new total regulator load */ 692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 693 output_uV, current_uA); 694 695 /* check the new mode is allowed */ 696 err = regulator_mode_constrain(rdev, &mode); 697 if (err == 0) 698 rdev->desc->ops->set_mode(rdev, mode); 699} 700 701static int suspend_set_state(struct regulator_dev *rdev, 702 struct regulator_state *rstate) 703{ 704 int ret = 0; 705 706 /* If we have no suspend mode configration don't set anything; 707 * only warn if the driver implements set_suspend_voltage or 708 * set_suspend_mode callback. 709 */ 710 if (!rstate->enabled && !rstate->disabled) { 711 if (rdev->desc->ops->set_suspend_voltage || 712 rdev->desc->ops->set_suspend_mode) 713 rdev_warn(rdev, "No configuration\n"); 714 return 0; 715 } 716 717 if (rstate->enabled && rstate->disabled) { 718 rdev_err(rdev, "invalid configuration\n"); 719 return -EINVAL; 720 } 721 722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 723 ret = rdev->desc->ops->set_suspend_enable(rdev); 724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 725 ret = rdev->desc->ops->set_suspend_disable(rdev); 726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 727 ret = 0; 728 729 if (ret < 0) { 730 rdev_err(rdev, "failed to enabled/disable\n"); 731 return ret; 732 } 733 734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 736 if (ret < 0) { 737 rdev_err(rdev, "failed to set voltage\n"); 738 return ret; 739 } 740 } 741 742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 744 if (ret < 0) { 745 rdev_err(rdev, "failed to set mode\n"); 746 return ret; 747 } 748 } 749 return ret; 750} 751 752/* locks held by caller */ 753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 754{ 755 if (!rdev->constraints) 756 return -EINVAL; 757 758 switch (state) { 759 case PM_SUSPEND_STANDBY: 760 return suspend_set_state(rdev, 761 &rdev->constraints->state_standby); 762 case PM_SUSPEND_MEM: 763 return suspend_set_state(rdev, 764 &rdev->constraints->state_mem); 765 case PM_SUSPEND_MAX: 766 return suspend_set_state(rdev, 767 &rdev->constraints->state_disk); 768 default: 769 return -EINVAL; 770 } 771} 772 773static void print_constraints(struct regulator_dev *rdev) 774{ 775 struct regulation_constraints *constraints = rdev->constraints; 776 char buf[80] = ""; 777 int count = 0; 778 int ret; 779 780 if (constraints->min_uV && constraints->max_uV) { 781 if (constraints->min_uV == constraints->max_uV) 782 count += sprintf(buf + count, "%d mV ", 783 constraints->min_uV / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mV ", 786 constraints->min_uV / 1000, 787 constraints->max_uV / 1000); 788 } 789 790 if (!constraints->min_uV || 791 constraints->min_uV != constraints->max_uV) { 792 ret = _regulator_get_voltage(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mV ", ret / 1000); 795 } 796 797 if (constraints->uV_offset) 798 count += sprintf(buf, "%dmV offset ", 799 constraints->uV_offset / 1000); 800 801 if (constraints->min_uA && constraints->max_uA) { 802 if (constraints->min_uA == constraints->max_uA) 803 count += sprintf(buf + count, "%d mA ", 804 constraints->min_uA / 1000); 805 else 806 count += sprintf(buf + count, "%d <--> %d mA ", 807 constraints->min_uA / 1000, 808 constraints->max_uA / 1000); 809 } 810 811 if (!constraints->min_uA || 812 constraints->min_uA != constraints->max_uA) { 813 ret = _regulator_get_current_limit(rdev); 814 if (ret > 0) 815 count += sprintf(buf + count, "at %d mA ", ret / 1000); 816 } 817 818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 819 count += sprintf(buf + count, "fast "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 821 count += sprintf(buf + count, "normal "); 822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 823 count += sprintf(buf + count, "idle "); 824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 825 count += sprintf(buf + count, "standby"); 826 827 if (!count) 828 sprintf(buf, "no parameters"); 829 830 rdev_info(rdev, "%s\n", buf); 831 832 if ((constraints->min_uV != constraints->max_uV) && 833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 834 rdev_warn(rdev, 835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 836} 837 838static int machine_constraints_voltage(struct regulator_dev *rdev, 839 struct regulation_constraints *constraints) 840{ 841 struct regulator_ops *ops = rdev->desc->ops; 842 int ret; 843 844 /* do we need to apply the constraint voltage */ 845 if (rdev->constraints->apply_uV && 846 rdev->constraints->min_uV == rdev->constraints->max_uV) { 847 ret = _regulator_do_set_voltage(rdev, 848 rdev->constraints->min_uV, 849 rdev->constraints->max_uV); 850 if (ret < 0) { 851 rdev_err(rdev, "failed to apply %duV constraint\n", 852 rdev->constraints->min_uV); 853 return ret; 854 } 855 } 856 857 /* constrain machine-level voltage specs to fit 858 * the actual range supported by this regulator. 859 */ 860 if (ops->list_voltage && rdev->desc->n_voltages) { 861 int count = rdev->desc->n_voltages; 862 int i; 863 int min_uV = INT_MAX; 864 int max_uV = INT_MIN; 865 int cmin = constraints->min_uV; 866 int cmax = constraints->max_uV; 867 868 /* it's safe to autoconfigure fixed-voltage supplies 869 and the constraints are used by list_voltage. */ 870 if (count == 1 && !cmin) { 871 cmin = 1; 872 cmax = INT_MAX; 873 constraints->min_uV = cmin; 874 constraints->max_uV = cmax; 875 } 876 877 /* voltage constraints are optional */ 878 if ((cmin == 0) && (cmax == 0)) 879 return 0; 880 881 /* else require explicit machine-level constraints */ 882 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 883 rdev_err(rdev, "invalid voltage constraints\n"); 884 return -EINVAL; 885 } 886 887 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 888 for (i = 0; i < count; i++) { 889 int value; 890 891 value = ops->list_voltage(rdev, i); 892 if (value <= 0) 893 continue; 894 895 /* maybe adjust [min_uV..max_uV] */ 896 if (value >= cmin && value < min_uV) 897 min_uV = value; 898 if (value <= cmax && value > max_uV) 899 max_uV = value; 900 } 901 902 /* final: [min_uV..max_uV] valid iff constraints valid */ 903 if (max_uV < min_uV) { 904 rdev_err(rdev, 905 "unsupportable voltage constraints %u-%uuV\n", 906 min_uV, max_uV); 907 return -EINVAL; 908 } 909 910 /* use regulator's subset of machine constraints */ 911 if (constraints->min_uV < min_uV) { 912 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 913 constraints->min_uV, min_uV); 914 constraints->min_uV = min_uV; 915 } 916 if (constraints->max_uV > max_uV) { 917 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 918 constraints->max_uV, max_uV); 919 constraints->max_uV = max_uV; 920 } 921 } 922 923 return 0; 924} 925 926/** 927 * set_machine_constraints - sets regulator constraints 928 * @rdev: regulator source 929 * @constraints: constraints to apply 930 * 931 * Allows platform initialisation code to define and constrain 932 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 933 * Constraints *must* be set by platform code in order for some 934 * regulator operations to proceed i.e. set_voltage, set_current_limit, 935 * set_mode. 936 */ 937static int set_machine_constraints(struct regulator_dev *rdev, 938 const struct regulation_constraints *constraints) 939{ 940 int ret = 0; 941 struct regulator_ops *ops = rdev->desc->ops; 942 943 if (constraints) 944 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 945 GFP_KERNEL); 946 else 947 rdev->constraints = kzalloc(sizeof(*constraints), 948 GFP_KERNEL); 949 if (!rdev->constraints) 950 return -ENOMEM; 951 952 ret = machine_constraints_voltage(rdev, rdev->constraints); 953 if (ret != 0) 954 goto out; 955 956 /* do we need to setup our suspend state */ 957 if (rdev->constraints->initial_state) { 958 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 959 if (ret < 0) { 960 rdev_err(rdev, "failed to set suspend state\n"); 961 goto out; 962 } 963 } 964 965 if (rdev->constraints->initial_mode) { 966 if (!ops->set_mode) { 967 rdev_err(rdev, "no set_mode operation\n"); 968 ret = -EINVAL; 969 goto out; 970 } 971 972 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 973 if (ret < 0) { 974 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 975 goto out; 976 } 977 } 978 979 /* If the constraints say the regulator should be on at this point 980 * and we have control then make sure it is enabled. 981 */ 982 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 983 ops->enable) { 984 ret = ops->enable(rdev); 985 if (ret < 0) { 986 rdev_err(rdev, "failed to enable\n"); 987 goto out; 988 } 989 } 990 991 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 992 && ops->set_ramp_delay) { 993 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 994 if (ret < 0) { 995 rdev_err(rdev, "failed to set ramp_delay\n"); 996 goto out; 997 } 998 } 999 1000 print_constraints(rdev); 1001 return 0; 1002out: 1003 kfree(rdev->constraints); 1004 rdev->constraints = NULL; 1005 return ret; 1006} 1007 1008/** 1009 * set_supply - set regulator supply regulator 1010 * @rdev: regulator name 1011 * @supply_rdev: supply regulator name 1012 * 1013 * Called by platform initialisation code to set the supply regulator for this 1014 * regulator. This ensures that a regulators supply will also be enabled by the 1015 * core if it's child is enabled. 1016 */ 1017static int set_supply(struct regulator_dev *rdev, 1018 struct regulator_dev *supply_rdev) 1019{ 1020 int err; 1021 1022 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1023 1024 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1025 if (rdev->supply == NULL) { 1026 err = -ENOMEM; 1027 return err; 1028 } 1029 supply_rdev->open_count++; 1030 1031 return 0; 1032} 1033 1034/** 1035 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1036 * @rdev: regulator source 1037 * @consumer_dev_name: dev_name() string for device supply applies to 1038 * @supply: symbolic name for supply 1039 * 1040 * Allows platform initialisation code to map physical regulator 1041 * sources to symbolic names for supplies for use by devices. Devices 1042 * should use these symbolic names to request regulators, avoiding the 1043 * need to provide board-specific regulator names as platform data. 1044 */ 1045static int set_consumer_device_supply(struct regulator_dev *rdev, 1046 const char *consumer_dev_name, 1047 const char *supply) 1048{ 1049 struct regulator_map *node; 1050 int has_dev; 1051 1052 if (supply == NULL) 1053 return -EINVAL; 1054 1055 if (consumer_dev_name != NULL) 1056 has_dev = 1; 1057 else 1058 has_dev = 0; 1059 1060 list_for_each_entry(node, ®ulator_map_list, list) { 1061 if (node->dev_name && consumer_dev_name) { 1062 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1063 continue; 1064 } else if (node->dev_name || consumer_dev_name) { 1065 continue; 1066 } 1067 1068 if (strcmp(node->supply, supply) != 0) 1069 continue; 1070 1071 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1072 consumer_dev_name, 1073 dev_name(&node->regulator->dev), 1074 node->regulator->desc->name, 1075 supply, 1076 dev_name(&rdev->dev), rdev_get_name(rdev)); 1077 return -EBUSY; 1078 } 1079 1080 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1081 if (node == NULL) 1082 return -ENOMEM; 1083 1084 node->regulator = rdev; 1085 node->supply = supply; 1086 1087 if (has_dev) { 1088 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1089 if (node->dev_name == NULL) { 1090 kfree(node); 1091 return -ENOMEM; 1092 } 1093 } 1094 1095 list_add(&node->list, ®ulator_map_list); 1096 return 0; 1097} 1098 1099static void unset_regulator_supplies(struct regulator_dev *rdev) 1100{ 1101 struct regulator_map *node, *n; 1102 1103 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1104 if (rdev == node->regulator) { 1105 list_del(&node->list); 1106 kfree(node->dev_name); 1107 kfree(node); 1108 } 1109 } 1110} 1111 1112#define REG_STR_SIZE 64 1113 1114static struct regulator *create_regulator(struct regulator_dev *rdev, 1115 struct device *dev, 1116 const char *supply_name) 1117{ 1118 struct regulator *regulator; 1119 char buf[REG_STR_SIZE]; 1120 int err, size; 1121 1122 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1123 if (regulator == NULL) 1124 return NULL; 1125 1126 mutex_lock(&rdev->mutex); 1127 regulator->rdev = rdev; 1128 list_add(®ulator->list, &rdev->consumer_list); 1129 1130 if (dev) { 1131 regulator->dev = dev; 1132 1133 /* Add a link to the device sysfs entry */ 1134 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1135 dev->kobj.name, supply_name); 1136 if (size >= REG_STR_SIZE) 1137 goto overflow_err; 1138 1139 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1140 if (regulator->supply_name == NULL) 1141 goto overflow_err; 1142 1143 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1144 buf); 1145 if (err) { 1146 rdev_warn(rdev, "could not add device link %s err %d\n", 1147 dev->kobj.name, err); 1148 /* non-fatal */ 1149 } 1150 } else { 1151 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1152 if (regulator->supply_name == NULL) 1153 goto overflow_err; 1154 } 1155 1156 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1157 rdev->debugfs); 1158 if (!regulator->debugfs) { 1159 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1160 } else { 1161 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1162 ®ulator->uA_load); 1163 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1164 ®ulator->min_uV); 1165 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1166 ®ulator->max_uV); 1167 } 1168 1169 /* 1170 * Check now if the regulator is an always on regulator - if 1171 * it is then we don't need to do nearly so much work for 1172 * enable/disable calls. 1173 */ 1174 if (!_regulator_can_change_status(rdev) && 1175 _regulator_is_enabled(rdev)) 1176 regulator->always_on = true; 1177 1178 mutex_unlock(&rdev->mutex); 1179 return regulator; 1180overflow_err: 1181 list_del(®ulator->list); 1182 kfree(regulator); 1183 mutex_unlock(&rdev->mutex); 1184 return NULL; 1185} 1186 1187static int _regulator_get_enable_time(struct regulator_dev *rdev) 1188{ 1189 if (!rdev->desc->ops->enable_time) 1190 return rdev->desc->enable_time; 1191 return rdev->desc->ops->enable_time(rdev); 1192} 1193 1194static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1195 const char *supply, 1196 int *ret) 1197{ 1198 struct regulator_dev *r; 1199 struct device_node *node; 1200 struct regulator_map *map; 1201 const char *devname = NULL; 1202 1203 /* first do a dt based lookup */ 1204 if (dev && dev->of_node) { 1205 node = of_get_regulator(dev, supply); 1206 if (node) { 1207 list_for_each_entry(r, ®ulator_list, list) 1208 if (r->dev.parent && 1209 node == r->dev.of_node) 1210 return r; 1211 } else { 1212 /* 1213 * If we couldn't even get the node then it's 1214 * not just that the device didn't register 1215 * yet, there's no node and we'll never 1216 * succeed. 1217 */ 1218 *ret = -ENODEV; 1219 } 1220 } 1221 1222 /* if not found, try doing it non-dt way */ 1223 if (dev) 1224 devname = dev_name(dev); 1225 1226 list_for_each_entry(r, ®ulator_list, list) 1227 if (strcmp(rdev_get_name(r), supply) == 0) 1228 return r; 1229 1230 list_for_each_entry(map, ®ulator_map_list, list) { 1231 /* If the mapping has a device set up it must match */ 1232 if (map->dev_name && 1233 (!devname || strcmp(map->dev_name, devname))) 1234 continue; 1235 1236 if (strcmp(map->supply, supply) == 0) 1237 return map->regulator; 1238 } 1239 1240 1241 return NULL; 1242} 1243 1244/* Internal regulator request function */ 1245static struct regulator *_regulator_get(struct device *dev, const char *id, 1246 bool exclusive, bool allow_dummy) 1247{ 1248 struct regulator_dev *rdev; 1249 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1250 const char *devname = NULL; 1251 int ret = 0; 1252 1253 if (id == NULL) { 1254 pr_err("get() with no identifier\n"); 1255 return regulator; 1256 } 1257 1258 if (dev) 1259 devname = dev_name(dev); 1260 1261 mutex_lock(®ulator_list_mutex); 1262 1263 rdev = regulator_dev_lookup(dev, id, &ret); 1264 if (rdev) 1265 goto found; 1266 1267 /* 1268 * If we have return value from dev_lookup fail, we do not expect to 1269 * succeed, so, quit with appropriate error value 1270 */ 1271 if (ret && ret != -ENODEV) { 1272 regulator = ERR_PTR(ret); 1273 goto out; 1274 } 1275 1276 if (!devname) 1277 devname = "deviceless"; 1278 1279 /* 1280 * Assume that a regulator is physically present and enabled 1281 * even if it isn't hooked up and just provide a dummy. 1282 */ 1283 if (has_full_constraints && allow_dummy) { 1284 /* 1285 * Log the substitution if regulator configuration is 1286 * not complete to help development. 1287 */ 1288 if (!has_full_constraints) 1289 pr_warn("%s supply %s not found, using dummy regulator\n", 1290 devname, id); 1291 1292 rdev = dummy_regulator_rdev; 1293 goto found; 1294 } else { 1295 dev_err(dev, "dummy supplies not allowed\n"); 1296 } 1297 1298 mutex_unlock(®ulator_list_mutex); 1299 return regulator; 1300 1301found: 1302 if (rdev->exclusive) { 1303 regulator = ERR_PTR(-EPERM); 1304 goto out; 1305 } 1306 1307 if (exclusive && rdev->open_count) { 1308 regulator = ERR_PTR(-EBUSY); 1309 goto out; 1310 } 1311 1312 if (!try_module_get(rdev->owner)) 1313 goto out; 1314 1315 regulator = create_regulator(rdev, dev, id); 1316 if (regulator == NULL) { 1317 regulator = ERR_PTR(-ENOMEM); 1318 module_put(rdev->owner); 1319 goto out; 1320 } 1321 1322 rdev->open_count++; 1323 if (exclusive) { 1324 rdev->exclusive = 1; 1325 1326 ret = _regulator_is_enabled(rdev); 1327 if (ret > 0) 1328 rdev->use_count = 1; 1329 else 1330 rdev->use_count = 0; 1331 } 1332 1333out: 1334 mutex_unlock(®ulator_list_mutex); 1335 1336 return regulator; 1337} 1338 1339/** 1340 * regulator_get - lookup and obtain a reference to a regulator. 1341 * @dev: device for regulator "consumer" 1342 * @id: Supply name or regulator ID. 1343 * 1344 * Returns a struct regulator corresponding to the regulator producer, 1345 * or IS_ERR() condition containing errno. 1346 * 1347 * Use of supply names configured via regulator_set_device_supply() is 1348 * strongly encouraged. It is recommended that the supply name used 1349 * should match the name used for the supply and/or the relevant 1350 * device pins in the datasheet. 1351 */ 1352struct regulator *regulator_get(struct device *dev, const char *id) 1353{ 1354 return _regulator_get(dev, id, false, true); 1355} 1356EXPORT_SYMBOL_GPL(regulator_get); 1357 1358static void devm_regulator_release(struct device *dev, void *res) 1359{ 1360 regulator_put(*(struct regulator **)res); 1361} 1362 1363/** 1364 * devm_regulator_get - Resource managed regulator_get() 1365 * @dev: device for regulator "consumer" 1366 * @id: Supply name or regulator ID. 1367 * 1368 * Managed regulator_get(). Regulators returned from this function are 1369 * automatically regulator_put() on driver detach. See regulator_get() for more 1370 * information. 1371 */ 1372struct regulator *devm_regulator_get(struct device *dev, const char *id) 1373{ 1374 struct regulator **ptr, *regulator; 1375 1376 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1377 if (!ptr) 1378 return ERR_PTR(-ENOMEM); 1379 1380 regulator = regulator_get(dev, id); 1381 if (!IS_ERR(regulator)) { 1382 *ptr = regulator; 1383 devres_add(dev, ptr); 1384 } else { 1385 devres_free(ptr); 1386 } 1387 1388 return regulator; 1389} 1390EXPORT_SYMBOL_GPL(devm_regulator_get); 1391 1392/** 1393 * regulator_get_exclusive - obtain exclusive access to a regulator. 1394 * @dev: device for regulator "consumer" 1395 * @id: Supply name or regulator ID. 1396 * 1397 * Returns a struct regulator corresponding to the regulator producer, 1398 * or IS_ERR() condition containing errno. Other consumers will be 1399 * unable to obtain this reference is held and the use count for the 1400 * regulator will be initialised to reflect the current state of the 1401 * regulator. 1402 * 1403 * This is intended for use by consumers which cannot tolerate shared 1404 * use of the regulator such as those which need to force the 1405 * regulator off for correct operation of the hardware they are 1406 * controlling. 1407 * 1408 * Use of supply names configured via regulator_set_device_supply() is 1409 * strongly encouraged. It is recommended that the supply name used 1410 * should match the name used for the supply and/or the relevant 1411 * device pins in the datasheet. 1412 */ 1413struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1414{ 1415 return _regulator_get(dev, id, true, false); 1416} 1417EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1418 1419/** 1420 * regulator_get_optional - obtain optional access to a regulator. 1421 * @dev: device for regulator "consumer" 1422 * @id: Supply name or regulator ID. 1423 * 1424 * Returns a struct regulator corresponding to the regulator producer, 1425 * or IS_ERR() condition containing errno. Other consumers will be 1426 * unable to obtain this reference is held and the use count for the 1427 * regulator will be initialised to reflect the current state of the 1428 * regulator. 1429 * 1430 * This is intended for use by consumers for devices which can have 1431 * some supplies unconnected in normal use, such as some MMC devices. 1432 * It can allow the regulator core to provide stub supplies for other 1433 * supplies requested using normal regulator_get() calls without 1434 * disrupting the operation of drivers that can handle absent 1435 * supplies. 1436 * 1437 * Use of supply names configured via regulator_set_device_supply() is 1438 * strongly encouraged. It is recommended that the supply name used 1439 * should match the name used for the supply and/or the relevant 1440 * device pins in the datasheet. 1441 */ 1442struct regulator *regulator_get_optional(struct device *dev, const char *id) 1443{ 1444 return _regulator_get(dev, id, false, false); 1445} 1446EXPORT_SYMBOL_GPL(regulator_get_optional); 1447 1448/** 1449 * devm_regulator_get_optional - Resource managed regulator_get_optional() 1450 * @dev: device for regulator "consumer" 1451 * @id: Supply name or regulator ID. 1452 * 1453 * Managed regulator_get_optional(). Regulators returned from this 1454 * function are automatically regulator_put() on driver detach. See 1455 * regulator_get_optional() for more information. 1456 */ 1457struct regulator *devm_regulator_get_optional(struct device *dev, 1458 const char *id) 1459{ 1460 struct regulator **ptr, *regulator; 1461 1462 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1463 if (!ptr) 1464 return ERR_PTR(-ENOMEM); 1465 1466 regulator = regulator_get_optional(dev, id); 1467 if (!IS_ERR(regulator)) { 1468 *ptr = regulator; 1469 devres_add(dev, ptr); 1470 } else { 1471 devres_free(ptr); 1472 } 1473 1474 return regulator; 1475} 1476EXPORT_SYMBOL_GPL(devm_regulator_get_optional); 1477 1478/* Locks held by regulator_put() */ 1479static void _regulator_put(struct regulator *regulator) 1480{ 1481 struct regulator_dev *rdev; 1482 1483 if (regulator == NULL || IS_ERR(regulator)) 1484 return; 1485 1486 rdev = regulator->rdev; 1487 1488 debugfs_remove_recursive(regulator->debugfs); 1489 1490 /* remove any sysfs entries */ 1491 if (regulator->dev) 1492 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1493 kfree(regulator->supply_name); 1494 list_del(®ulator->list); 1495 kfree(regulator); 1496 1497 rdev->open_count--; 1498 rdev->exclusive = 0; 1499 1500 module_put(rdev->owner); 1501} 1502 1503/** 1504 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive() 1505 * @dev: device for regulator "consumer" 1506 * @id: Supply name or regulator ID. 1507 * 1508 * Managed regulator_get_exclusive(). Regulators returned from this function 1509 * are automatically regulator_put() on driver detach. See regulator_get() for 1510 * more information. 1511 */ 1512struct regulator *devm_regulator_get_exclusive(struct device *dev, 1513 const char *id) 1514{ 1515 struct regulator **ptr, *regulator; 1516 1517 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1518 if (!ptr) 1519 return ERR_PTR(-ENOMEM); 1520 1521 regulator = _regulator_get(dev, id, 1); 1522 if (!IS_ERR(regulator)) { 1523 *ptr = regulator; 1524 devres_add(dev, ptr); 1525 } else { 1526 devres_free(ptr); 1527 } 1528 1529 return regulator; 1530} 1531EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive); 1532 1533/** 1534 * regulator_put - "free" the regulator source 1535 * @regulator: regulator source 1536 * 1537 * Note: drivers must ensure that all regulator_enable calls made on this 1538 * regulator source are balanced by regulator_disable calls prior to calling 1539 * this function. 1540 */ 1541void regulator_put(struct regulator *regulator) 1542{ 1543 mutex_lock(®ulator_list_mutex); 1544 _regulator_put(regulator); 1545 mutex_unlock(®ulator_list_mutex); 1546} 1547EXPORT_SYMBOL_GPL(regulator_put); 1548 1549static int devm_regulator_match(struct device *dev, void *res, void *data) 1550{ 1551 struct regulator **r = res; 1552 if (!r || !*r) { 1553 WARN_ON(!r || !*r); 1554 return 0; 1555 } 1556 return *r == data; 1557} 1558 1559/** 1560 * devm_regulator_put - Resource managed regulator_put() 1561 * @regulator: regulator to free 1562 * 1563 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1564 * this function will not need to be called and the resource management 1565 * code will ensure that the resource is freed. 1566 */ 1567void devm_regulator_put(struct regulator *regulator) 1568{ 1569 int rc; 1570 1571 rc = devres_release(regulator->dev, devm_regulator_release, 1572 devm_regulator_match, regulator); 1573 if (rc != 0) 1574 WARN_ON(rc); 1575} 1576EXPORT_SYMBOL_GPL(devm_regulator_put); 1577 1578/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1579static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1580 const struct regulator_config *config) 1581{ 1582 struct regulator_enable_gpio *pin; 1583 int ret; 1584 1585 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1586 if (pin->gpio == config->ena_gpio) { 1587 rdev_dbg(rdev, "GPIO %d is already used\n", 1588 config->ena_gpio); 1589 goto update_ena_gpio_to_rdev; 1590 } 1591 } 1592 1593 ret = gpio_request_one(config->ena_gpio, 1594 GPIOF_DIR_OUT | config->ena_gpio_flags, 1595 rdev_get_name(rdev)); 1596 if (ret) 1597 return ret; 1598 1599 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1600 if (pin == NULL) { 1601 gpio_free(config->ena_gpio); 1602 return -ENOMEM; 1603 } 1604 1605 pin->gpio = config->ena_gpio; 1606 pin->ena_gpio_invert = config->ena_gpio_invert; 1607 list_add(&pin->list, ®ulator_ena_gpio_list); 1608 1609update_ena_gpio_to_rdev: 1610 pin->request_count++; 1611 rdev->ena_pin = pin; 1612 return 0; 1613} 1614 1615static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1616{ 1617 struct regulator_enable_gpio *pin, *n; 1618 1619 if (!rdev->ena_pin) 1620 return; 1621 1622 /* Free the GPIO only in case of no use */ 1623 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1624 if (pin->gpio == rdev->ena_pin->gpio) { 1625 if (pin->request_count <= 1) { 1626 pin->request_count = 0; 1627 gpio_free(pin->gpio); 1628 list_del(&pin->list); 1629 kfree(pin); 1630 } else { 1631 pin->request_count--; 1632 } 1633 } 1634 } 1635} 1636 1637/** 1638 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1639 * @rdev: regulator_dev structure 1640 * @enable: enable GPIO at initial use? 1641 * 1642 * GPIO is enabled in case of initial use. (enable_count is 0) 1643 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1644 */ 1645static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1646{ 1647 struct regulator_enable_gpio *pin = rdev->ena_pin; 1648 1649 if (!pin) 1650 return -EINVAL; 1651 1652 if (enable) { 1653 /* Enable GPIO at initial use */ 1654 if (pin->enable_count == 0) 1655 gpio_set_value_cansleep(pin->gpio, 1656 !pin->ena_gpio_invert); 1657 1658 pin->enable_count++; 1659 } else { 1660 if (pin->enable_count > 1) { 1661 pin->enable_count--; 1662 return 0; 1663 } 1664 1665 /* Disable GPIO if not used */ 1666 if (pin->enable_count <= 1) { 1667 gpio_set_value_cansleep(pin->gpio, 1668 pin->ena_gpio_invert); 1669 pin->enable_count = 0; 1670 } 1671 } 1672 1673 return 0; 1674} 1675 1676static int _regulator_do_enable(struct regulator_dev *rdev) 1677{ 1678 int ret, delay; 1679 1680 /* Query before enabling in case configuration dependent. */ 1681 ret = _regulator_get_enable_time(rdev); 1682 if (ret >= 0) { 1683 delay = ret; 1684 } else { 1685 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1686 delay = 0; 1687 } 1688 1689 trace_regulator_enable(rdev_get_name(rdev)); 1690 1691 if (rdev->ena_pin) { 1692 ret = regulator_ena_gpio_ctrl(rdev, true); 1693 if (ret < 0) 1694 return ret; 1695 rdev->ena_gpio_state = 1; 1696 } else if (rdev->desc->ops->enable) { 1697 ret = rdev->desc->ops->enable(rdev); 1698 if (ret < 0) 1699 return ret; 1700 } else { 1701 return -EINVAL; 1702 } 1703 1704 /* Allow the regulator to ramp; it would be useful to extend 1705 * this for bulk operations so that the regulators can ramp 1706 * together. */ 1707 trace_regulator_enable_delay(rdev_get_name(rdev)); 1708 1709 if (delay >= 1000) { 1710 mdelay(delay / 1000); 1711 udelay(delay % 1000); 1712 } else if (delay) { 1713 udelay(delay); 1714 } 1715 1716 trace_regulator_enable_complete(rdev_get_name(rdev)); 1717 1718 return 0; 1719} 1720 1721/* locks held by regulator_enable() */ 1722static int _regulator_enable(struct regulator_dev *rdev) 1723{ 1724 int ret; 1725 1726 /* check voltage and requested load before enabling */ 1727 if (rdev->constraints && 1728 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1729 drms_uA_update(rdev); 1730 1731 if (rdev->use_count == 0) { 1732 /* The regulator may on if it's not switchable or left on */ 1733 ret = _regulator_is_enabled(rdev); 1734 if (ret == -EINVAL || ret == 0) { 1735 if (!_regulator_can_change_status(rdev)) 1736 return -EPERM; 1737 1738 ret = _regulator_do_enable(rdev); 1739 if (ret < 0) 1740 return ret; 1741 1742 } else if (ret < 0) { 1743 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1744 return ret; 1745 } 1746 /* Fallthrough on positive return values - already enabled */ 1747 } 1748 1749 rdev->use_count++; 1750 1751 return 0; 1752} 1753 1754/** 1755 * regulator_enable - enable regulator output 1756 * @regulator: regulator source 1757 * 1758 * Request that the regulator be enabled with the regulator output at 1759 * the predefined voltage or current value. Calls to regulator_enable() 1760 * must be balanced with calls to regulator_disable(). 1761 * 1762 * NOTE: the output value can be set by other drivers, boot loader or may be 1763 * hardwired in the regulator. 1764 */ 1765int regulator_enable(struct regulator *regulator) 1766{ 1767 struct regulator_dev *rdev = regulator->rdev; 1768 int ret = 0; 1769 1770 if (regulator->always_on) 1771 return 0; 1772 1773 if (rdev->supply) { 1774 ret = regulator_enable(rdev->supply); 1775 if (ret != 0) 1776 return ret; 1777 } 1778 1779 mutex_lock(&rdev->mutex); 1780 ret = _regulator_enable(rdev); 1781 mutex_unlock(&rdev->mutex); 1782 1783 if (ret != 0 && rdev->supply) 1784 regulator_disable(rdev->supply); 1785 1786 return ret; 1787} 1788EXPORT_SYMBOL_GPL(regulator_enable); 1789 1790static int _regulator_do_disable(struct regulator_dev *rdev) 1791{ 1792 int ret; 1793 1794 trace_regulator_disable(rdev_get_name(rdev)); 1795 1796 if (rdev->ena_pin) { 1797 ret = regulator_ena_gpio_ctrl(rdev, false); 1798 if (ret < 0) 1799 return ret; 1800 rdev->ena_gpio_state = 0; 1801 1802 } else if (rdev->desc->ops->disable) { 1803 ret = rdev->desc->ops->disable(rdev); 1804 if (ret != 0) 1805 return ret; 1806 } 1807 1808 trace_regulator_disable_complete(rdev_get_name(rdev)); 1809 1810 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1811 NULL); 1812 return 0; 1813} 1814 1815/* locks held by regulator_disable() */ 1816static int _regulator_disable(struct regulator_dev *rdev) 1817{ 1818 int ret = 0; 1819 1820 if (WARN(rdev->use_count <= 0, 1821 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1822 return -EIO; 1823 1824 /* are we the last user and permitted to disable ? */ 1825 if (rdev->use_count == 1 && 1826 (rdev->constraints && !rdev->constraints->always_on)) { 1827 1828 /* we are last user */ 1829 if (_regulator_can_change_status(rdev)) { 1830 ret = _regulator_do_disable(rdev); 1831 if (ret < 0) { 1832 rdev_err(rdev, "failed to disable\n"); 1833 return ret; 1834 } 1835 } 1836 1837 rdev->use_count = 0; 1838 } else if (rdev->use_count > 1) { 1839 1840 if (rdev->constraints && 1841 (rdev->constraints->valid_ops_mask & 1842 REGULATOR_CHANGE_DRMS)) 1843 drms_uA_update(rdev); 1844 1845 rdev->use_count--; 1846 } 1847 1848 return ret; 1849} 1850 1851/** 1852 * regulator_disable - disable regulator output 1853 * @regulator: regulator source 1854 * 1855 * Disable the regulator output voltage or current. Calls to 1856 * regulator_enable() must be balanced with calls to 1857 * regulator_disable(). 1858 * 1859 * NOTE: this will only disable the regulator output if no other consumer 1860 * devices have it enabled, the regulator device supports disabling and 1861 * machine constraints permit this operation. 1862 */ 1863int regulator_disable(struct regulator *regulator) 1864{ 1865 struct regulator_dev *rdev = regulator->rdev; 1866 int ret = 0; 1867 1868 if (regulator->always_on) 1869 return 0; 1870 1871 mutex_lock(&rdev->mutex); 1872 ret = _regulator_disable(rdev); 1873 mutex_unlock(&rdev->mutex); 1874 1875 if (ret == 0 && rdev->supply) 1876 regulator_disable(rdev->supply); 1877 1878 return ret; 1879} 1880EXPORT_SYMBOL_GPL(regulator_disable); 1881 1882/* locks held by regulator_force_disable() */ 1883static int _regulator_force_disable(struct regulator_dev *rdev) 1884{ 1885 int ret = 0; 1886 1887 /* force disable */ 1888 if (rdev->desc->ops->disable) { 1889 /* ah well, who wants to live forever... */ 1890 ret = rdev->desc->ops->disable(rdev); 1891 if (ret < 0) { 1892 rdev_err(rdev, "failed to force disable\n"); 1893 return ret; 1894 } 1895 /* notify other consumers that power has been forced off */ 1896 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1897 REGULATOR_EVENT_DISABLE, NULL); 1898 } 1899 1900 return ret; 1901} 1902 1903/** 1904 * regulator_force_disable - force disable regulator output 1905 * @regulator: regulator source 1906 * 1907 * Forcibly disable the regulator output voltage or current. 1908 * NOTE: this *will* disable the regulator output even if other consumer 1909 * devices have it enabled. This should be used for situations when device 1910 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1911 */ 1912int regulator_force_disable(struct regulator *regulator) 1913{ 1914 struct regulator_dev *rdev = regulator->rdev; 1915 int ret; 1916 1917 mutex_lock(&rdev->mutex); 1918 regulator->uA_load = 0; 1919 ret = _regulator_force_disable(regulator->rdev); 1920 mutex_unlock(&rdev->mutex); 1921 1922 if (rdev->supply) 1923 while (rdev->open_count--) 1924 regulator_disable(rdev->supply); 1925 1926 return ret; 1927} 1928EXPORT_SYMBOL_GPL(regulator_force_disable); 1929 1930static void regulator_disable_work(struct work_struct *work) 1931{ 1932 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1933 disable_work.work); 1934 int count, i, ret; 1935 1936 mutex_lock(&rdev->mutex); 1937 1938 BUG_ON(!rdev->deferred_disables); 1939 1940 count = rdev->deferred_disables; 1941 rdev->deferred_disables = 0; 1942 1943 for (i = 0; i < count; i++) { 1944 ret = _regulator_disable(rdev); 1945 if (ret != 0) 1946 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1947 } 1948 1949 mutex_unlock(&rdev->mutex); 1950 1951 if (rdev->supply) { 1952 for (i = 0; i < count; i++) { 1953 ret = regulator_disable(rdev->supply); 1954 if (ret != 0) { 1955 rdev_err(rdev, 1956 "Supply disable failed: %d\n", ret); 1957 } 1958 } 1959 } 1960} 1961 1962/** 1963 * regulator_disable_deferred - disable regulator output with delay 1964 * @regulator: regulator source 1965 * @ms: miliseconds until the regulator is disabled 1966 * 1967 * Execute regulator_disable() on the regulator after a delay. This 1968 * is intended for use with devices that require some time to quiesce. 1969 * 1970 * NOTE: this will only disable the regulator output if no other consumer 1971 * devices have it enabled, the regulator device supports disabling and 1972 * machine constraints permit this operation. 1973 */ 1974int regulator_disable_deferred(struct regulator *regulator, int ms) 1975{ 1976 struct regulator_dev *rdev = regulator->rdev; 1977 int ret; 1978 1979 if (regulator->always_on) 1980 return 0; 1981 1982 if (!ms) 1983 return regulator_disable(regulator); 1984 1985 mutex_lock(&rdev->mutex); 1986 rdev->deferred_disables++; 1987 mutex_unlock(&rdev->mutex); 1988 1989 ret = queue_delayed_work(system_power_efficient_wq, 1990 &rdev->disable_work, 1991 msecs_to_jiffies(ms)); 1992 if (ret < 0) 1993 return ret; 1994 else 1995 return 0; 1996} 1997EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1998 1999static int _regulator_is_enabled(struct regulator_dev *rdev) 2000{ 2001 /* A GPIO control always takes precedence */ 2002 if (rdev->ena_pin) 2003 return rdev->ena_gpio_state; 2004 2005 /* If we don't know then assume that the regulator is always on */ 2006 if (!rdev->desc->ops->is_enabled) 2007 return 1; 2008 2009 return rdev->desc->ops->is_enabled(rdev); 2010} 2011 2012/** 2013 * regulator_is_enabled - is the regulator output enabled 2014 * @regulator: regulator source 2015 * 2016 * Returns positive if the regulator driver backing the source/client 2017 * has requested that the device be enabled, zero if it hasn't, else a 2018 * negative errno code. 2019 * 2020 * Note that the device backing this regulator handle can have multiple 2021 * users, so it might be enabled even if regulator_enable() was never 2022 * called for this particular source. 2023 */ 2024int regulator_is_enabled(struct regulator *regulator) 2025{ 2026 int ret; 2027 2028 if (regulator->always_on) 2029 return 1; 2030 2031 mutex_lock(®ulator->rdev->mutex); 2032 ret = _regulator_is_enabled(regulator->rdev); 2033 mutex_unlock(®ulator->rdev->mutex); 2034 2035 return ret; 2036} 2037EXPORT_SYMBOL_GPL(regulator_is_enabled); 2038 2039/** 2040 * regulator_can_change_voltage - check if regulator can change voltage 2041 * @regulator: regulator source 2042 * 2043 * Returns positive if the regulator driver backing the source/client 2044 * can change its voltage, false otherwise. Usefull for detecting fixed 2045 * or dummy regulators and disabling voltage change logic in the client 2046 * driver. 2047 */ 2048int regulator_can_change_voltage(struct regulator *regulator) 2049{ 2050 struct regulator_dev *rdev = regulator->rdev; 2051 2052 if (rdev->constraints && 2053 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2054 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2055 return 1; 2056 2057 if (rdev->desc->continuous_voltage_range && 2058 rdev->constraints->min_uV && rdev->constraints->max_uV && 2059 rdev->constraints->min_uV != rdev->constraints->max_uV) 2060 return 1; 2061 } 2062 2063 return 0; 2064} 2065EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2066 2067/** 2068 * regulator_count_voltages - count regulator_list_voltage() selectors 2069 * @regulator: regulator source 2070 * 2071 * Returns number of selectors, or negative errno. Selectors are 2072 * numbered starting at zero, and typically correspond to bitfields 2073 * in hardware registers. 2074 */ 2075int regulator_count_voltages(struct regulator *regulator) 2076{ 2077 struct regulator_dev *rdev = regulator->rdev; 2078 2079 return rdev->desc->n_voltages ? : -EINVAL; 2080} 2081EXPORT_SYMBOL_GPL(regulator_count_voltages); 2082 2083/** 2084 * regulator_list_voltage - enumerate supported voltages 2085 * @regulator: regulator source 2086 * @selector: identify voltage to list 2087 * Context: can sleep 2088 * 2089 * Returns a voltage that can be passed to @regulator_set_voltage(), 2090 * zero if this selector code can't be used on this system, or a 2091 * negative errno. 2092 */ 2093int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2094{ 2095 struct regulator_dev *rdev = regulator->rdev; 2096 struct regulator_ops *ops = rdev->desc->ops; 2097 int ret; 2098 2099 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2100 return -EINVAL; 2101 2102 mutex_lock(&rdev->mutex); 2103 ret = ops->list_voltage(rdev, selector); 2104 mutex_unlock(&rdev->mutex); 2105 2106 if (ret > 0) { 2107 if (ret < rdev->constraints->min_uV) 2108 ret = 0; 2109 else if (ret > rdev->constraints->max_uV) 2110 ret = 0; 2111 } 2112 2113 return ret; 2114} 2115EXPORT_SYMBOL_GPL(regulator_list_voltage); 2116 2117/** 2118 * regulator_get_linear_step - return the voltage step size between VSEL values 2119 * @regulator: regulator source 2120 * 2121 * Returns the voltage step size between VSEL values for linear 2122 * regulators, or return 0 if the regulator isn't a linear regulator. 2123 */ 2124unsigned int regulator_get_linear_step(struct regulator *regulator) 2125{ 2126 struct regulator_dev *rdev = regulator->rdev; 2127 2128 return rdev->desc->uV_step; 2129} 2130EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2131 2132/** 2133 * regulator_is_supported_voltage - check if a voltage range can be supported 2134 * 2135 * @regulator: Regulator to check. 2136 * @min_uV: Minimum required voltage in uV. 2137 * @max_uV: Maximum required voltage in uV. 2138 * 2139 * Returns a boolean or a negative error code. 2140 */ 2141int regulator_is_supported_voltage(struct regulator *regulator, 2142 int min_uV, int max_uV) 2143{ 2144 struct regulator_dev *rdev = regulator->rdev; 2145 int i, voltages, ret; 2146 2147 /* If we can't change voltage check the current voltage */ 2148 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2149 ret = regulator_get_voltage(regulator); 2150 if (ret >= 0) 2151 return (min_uV <= ret && ret <= max_uV); 2152 else 2153 return ret; 2154 } 2155 2156 /* Any voltage within constrains range is fine? */ 2157 if (rdev->desc->continuous_voltage_range) 2158 return min_uV >= rdev->constraints->min_uV && 2159 max_uV <= rdev->constraints->max_uV; 2160 2161 ret = regulator_count_voltages(regulator); 2162 if (ret < 0) 2163 return ret; 2164 voltages = ret; 2165 2166 for (i = 0; i < voltages; i++) { 2167 ret = regulator_list_voltage(regulator, i); 2168 2169 if (ret >= min_uV && ret <= max_uV) 2170 return 1; 2171 } 2172 2173 return 0; 2174} 2175EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2176 2177static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2178 int min_uV, int max_uV) 2179{ 2180 int ret; 2181 int delay = 0; 2182 int best_val = 0; 2183 unsigned int selector; 2184 int old_selector = -1; 2185 2186 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2187 2188 min_uV += rdev->constraints->uV_offset; 2189 max_uV += rdev->constraints->uV_offset; 2190 2191 /* 2192 * If we can't obtain the old selector there is not enough 2193 * info to call set_voltage_time_sel(). 2194 */ 2195 if (_regulator_is_enabled(rdev) && 2196 rdev->desc->ops->set_voltage_time_sel && 2197 rdev->desc->ops->get_voltage_sel) { 2198 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2199 if (old_selector < 0) 2200 return old_selector; 2201 } 2202 2203 if (rdev->desc->ops->set_voltage) { 2204 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2205 &selector); 2206 2207 if (ret >= 0) { 2208 if (rdev->desc->ops->list_voltage) 2209 best_val = rdev->desc->ops->list_voltage(rdev, 2210 selector); 2211 else 2212 best_val = _regulator_get_voltage(rdev); 2213 } 2214 2215 } else if (rdev->desc->ops->set_voltage_sel) { 2216 if (rdev->desc->ops->map_voltage) { 2217 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2218 max_uV); 2219 } else { 2220 if (rdev->desc->ops->list_voltage == 2221 regulator_list_voltage_linear) 2222 ret = regulator_map_voltage_linear(rdev, 2223 min_uV, max_uV); 2224 else 2225 ret = regulator_map_voltage_iterate(rdev, 2226 min_uV, max_uV); 2227 } 2228 2229 if (ret >= 0) { 2230 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2231 if (min_uV <= best_val && max_uV >= best_val) { 2232 selector = ret; 2233 if (old_selector == selector) 2234 ret = 0; 2235 else 2236 ret = rdev->desc->ops->set_voltage_sel( 2237 rdev, ret); 2238 } else { 2239 ret = -EINVAL; 2240 } 2241 } 2242 } else { 2243 ret = -EINVAL; 2244 } 2245 2246 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2247 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2248 && old_selector != selector) { 2249 2250 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2251 old_selector, selector); 2252 if (delay < 0) { 2253 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2254 delay); 2255 delay = 0; 2256 } 2257 2258 /* Insert any necessary delays */ 2259 if (delay >= 1000) { 2260 mdelay(delay / 1000); 2261 udelay(delay % 1000); 2262 } else if (delay) { 2263 udelay(delay); 2264 } 2265 } 2266 2267 if (ret == 0 && best_val >= 0) { 2268 unsigned long data = best_val; 2269 2270 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2271 (void *)data); 2272 } 2273 2274 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2275 2276 return ret; 2277} 2278 2279/** 2280 * regulator_set_voltage - set regulator output voltage 2281 * @regulator: regulator source 2282 * @min_uV: Minimum required voltage in uV 2283 * @max_uV: Maximum acceptable voltage in uV 2284 * 2285 * Sets a voltage regulator to the desired output voltage. This can be set 2286 * during any regulator state. IOW, regulator can be disabled or enabled. 2287 * 2288 * If the regulator is enabled then the voltage will change to the new value 2289 * immediately otherwise if the regulator is disabled the regulator will 2290 * output at the new voltage when enabled. 2291 * 2292 * NOTE: If the regulator is shared between several devices then the lowest 2293 * request voltage that meets the system constraints will be used. 2294 * Regulator system constraints must be set for this regulator before 2295 * calling this function otherwise this call will fail. 2296 */ 2297int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2298{ 2299 struct regulator_dev *rdev = regulator->rdev; 2300 int ret = 0; 2301 int old_min_uV, old_max_uV; 2302 2303 mutex_lock(&rdev->mutex); 2304 2305 /* If we're setting the same range as last time the change 2306 * should be a noop (some cpufreq implementations use the same 2307 * voltage for multiple frequencies, for example). 2308 */ 2309 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2310 goto out; 2311 2312 /* sanity check */ 2313 if (!rdev->desc->ops->set_voltage && 2314 !rdev->desc->ops->set_voltage_sel) { 2315 ret = -EINVAL; 2316 goto out; 2317 } 2318 2319 /* constraints check */ 2320 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2321 if (ret < 0) 2322 goto out; 2323 2324 /* restore original values in case of error */ 2325 old_min_uV = regulator->min_uV; 2326 old_max_uV = regulator->max_uV; 2327 regulator->min_uV = min_uV; 2328 regulator->max_uV = max_uV; 2329 2330 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2331 if (ret < 0) 2332 goto out2; 2333 2334 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2335 if (ret < 0) 2336 goto out2; 2337 2338out: 2339 mutex_unlock(&rdev->mutex); 2340 return ret; 2341out2: 2342 regulator->min_uV = old_min_uV; 2343 regulator->max_uV = old_max_uV; 2344 mutex_unlock(&rdev->mutex); 2345 return ret; 2346} 2347EXPORT_SYMBOL_GPL(regulator_set_voltage); 2348 2349/** 2350 * regulator_set_voltage_time - get raise/fall time 2351 * @regulator: regulator source 2352 * @old_uV: starting voltage in microvolts 2353 * @new_uV: target voltage in microvolts 2354 * 2355 * Provided with the starting and ending voltage, this function attempts to 2356 * calculate the time in microseconds required to rise or fall to this new 2357 * voltage. 2358 */ 2359int regulator_set_voltage_time(struct regulator *regulator, 2360 int old_uV, int new_uV) 2361{ 2362 struct regulator_dev *rdev = regulator->rdev; 2363 struct regulator_ops *ops = rdev->desc->ops; 2364 int old_sel = -1; 2365 int new_sel = -1; 2366 int voltage; 2367 int i; 2368 2369 /* Currently requires operations to do this */ 2370 if (!ops->list_voltage || !ops->set_voltage_time_sel 2371 || !rdev->desc->n_voltages) 2372 return -EINVAL; 2373 2374 for (i = 0; i < rdev->desc->n_voltages; i++) { 2375 /* We only look for exact voltage matches here */ 2376 voltage = regulator_list_voltage(regulator, i); 2377 if (voltage < 0) 2378 return -EINVAL; 2379 if (voltage == 0) 2380 continue; 2381 if (voltage == old_uV) 2382 old_sel = i; 2383 if (voltage == new_uV) 2384 new_sel = i; 2385 } 2386 2387 if (old_sel < 0 || new_sel < 0) 2388 return -EINVAL; 2389 2390 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2391} 2392EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2393 2394/** 2395 * regulator_set_voltage_time_sel - get raise/fall time 2396 * @rdev: regulator source device 2397 * @old_selector: selector for starting voltage 2398 * @new_selector: selector for target voltage 2399 * 2400 * Provided with the starting and target voltage selectors, this function 2401 * returns time in microseconds required to rise or fall to this new voltage 2402 * 2403 * Drivers providing ramp_delay in regulation_constraints can use this as their 2404 * set_voltage_time_sel() operation. 2405 */ 2406int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2407 unsigned int old_selector, 2408 unsigned int new_selector) 2409{ 2410 unsigned int ramp_delay = 0; 2411 int old_volt, new_volt; 2412 2413 if (rdev->constraints->ramp_delay) 2414 ramp_delay = rdev->constraints->ramp_delay; 2415 else if (rdev->desc->ramp_delay) 2416 ramp_delay = rdev->desc->ramp_delay; 2417 2418 if (ramp_delay == 0) { 2419 rdev_warn(rdev, "ramp_delay not set\n"); 2420 return 0; 2421 } 2422 2423 /* sanity check */ 2424 if (!rdev->desc->ops->list_voltage) 2425 return -EINVAL; 2426 2427 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2428 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2429 2430 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2431} 2432EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2433 2434/** 2435 * regulator_sync_voltage - re-apply last regulator output voltage 2436 * @regulator: regulator source 2437 * 2438 * Re-apply the last configured voltage. This is intended to be used 2439 * where some external control source the consumer is cooperating with 2440 * has caused the configured voltage to change. 2441 */ 2442int regulator_sync_voltage(struct regulator *regulator) 2443{ 2444 struct regulator_dev *rdev = regulator->rdev; 2445 int ret, min_uV, max_uV; 2446 2447 mutex_lock(&rdev->mutex); 2448 2449 if (!rdev->desc->ops->set_voltage && 2450 !rdev->desc->ops->set_voltage_sel) { 2451 ret = -EINVAL; 2452 goto out; 2453 } 2454 2455 /* This is only going to work if we've had a voltage configured. */ 2456 if (!regulator->min_uV && !regulator->max_uV) { 2457 ret = -EINVAL; 2458 goto out; 2459 } 2460 2461 min_uV = regulator->min_uV; 2462 max_uV = regulator->max_uV; 2463 2464 /* This should be a paranoia check... */ 2465 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2466 if (ret < 0) 2467 goto out; 2468 2469 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2470 if (ret < 0) 2471 goto out; 2472 2473 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2474 2475out: 2476 mutex_unlock(&rdev->mutex); 2477 return ret; 2478} 2479EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2480 2481static int _regulator_get_voltage(struct regulator_dev *rdev) 2482{ 2483 int sel, ret; 2484 2485 if (rdev->desc->ops->get_voltage_sel) { 2486 sel = rdev->desc->ops->get_voltage_sel(rdev); 2487 if (sel < 0) 2488 return sel; 2489 ret = rdev->desc->ops->list_voltage(rdev, sel); 2490 } else if (rdev->desc->ops->get_voltage) { 2491 ret = rdev->desc->ops->get_voltage(rdev); 2492 } else if (rdev->desc->ops->list_voltage) { 2493 ret = rdev->desc->ops->list_voltage(rdev, 0); 2494 } else { 2495 return -EINVAL; 2496 } 2497 2498 if (ret < 0) 2499 return ret; 2500 return ret - rdev->constraints->uV_offset; 2501} 2502 2503/** 2504 * regulator_get_voltage - get regulator output voltage 2505 * @regulator: regulator source 2506 * 2507 * This returns the current regulator voltage in uV. 2508 * 2509 * NOTE: If the regulator is disabled it will return the voltage value. This 2510 * function should not be used to determine regulator state. 2511 */ 2512int regulator_get_voltage(struct regulator *regulator) 2513{ 2514 int ret; 2515 2516 mutex_lock(®ulator->rdev->mutex); 2517 2518 ret = _regulator_get_voltage(regulator->rdev); 2519 2520 mutex_unlock(®ulator->rdev->mutex); 2521 2522 return ret; 2523} 2524EXPORT_SYMBOL_GPL(regulator_get_voltage); 2525 2526/** 2527 * regulator_set_current_limit - set regulator output current limit 2528 * @regulator: regulator source 2529 * @min_uA: Minimum supported current in uA 2530 * @max_uA: Maximum supported current in uA 2531 * 2532 * Sets current sink to the desired output current. This can be set during 2533 * any regulator state. IOW, regulator can be disabled or enabled. 2534 * 2535 * If the regulator is enabled then the current will change to the new value 2536 * immediately otherwise if the regulator is disabled the regulator will 2537 * output at the new current when enabled. 2538 * 2539 * NOTE: Regulator system constraints must be set for this regulator before 2540 * calling this function otherwise this call will fail. 2541 */ 2542int regulator_set_current_limit(struct regulator *regulator, 2543 int min_uA, int max_uA) 2544{ 2545 struct regulator_dev *rdev = regulator->rdev; 2546 int ret; 2547 2548 mutex_lock(&rdev->mutex); 2549 2550 /* sanity check */ 2551 if (!rdev->desc->ops->set_current_limit) { 2552 ret = -EINVAL; 2553 goto out; 2554 } 2555 2556 /* constraints check */ 2557 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2558 if (ret < 0) 2559 goto out; 2560 2561 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2562out: 2563 mutex_unlock(&rdev->mutex); 2564 return ret; 2565} 2566EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2567 2568static int _regulator_get_current_limit(struct regulator_dev *rdev) 2569{ 2570 int ret; 2571 2572 mutex_lock(&rdev->mutex); 2573 2574 /* sanity check */ 2575 if (!rdev->desc->ops->get_current_limit) { 2576 ret = -EINVAL; 2577 goto out; 2578 } 2579 2580 ret = rdev->desc->ops->get_current_limit(rdev); 2581out: 2582 mutex_unlock(&rdev->mutex); 2583 return ret; 2584} 2585 2586/** 2587 * regulator_get_current_limit - get regulator output current 2588 * @regulator: regulator source 2589 * 2590 * This returns the current supplied by the specified current sink in uA. 2591 * 2592 * NOTE: If the regulator is disabled it will return the current value. This 2593 * function should not be used to determine regulator state. 2594 */ 2595int regulator_get_current_limit(struct regulator *regulator) 2596{ 2597 return _regulator_get_current_limit(regulator->rdev); 2598} 2599EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2600 2601/** 2602 * regulator_set_mode - set regulator operating mode 2603 * @regulator: regulator source 2604 * @mode: operating mode - one of the REGULATOR_MODE constants 2605 * 2606 * Set regulator operating mode to increase regulator efficiency or improve 2607 * regulation performance. 2608 * 2609 * NOTE: Regulator system constraints must be set for this regulator before 2610 * calling this function otherwise this call will fail. 2611 */ 2612int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2613{ 2614 struct regulator_dev *rdev = regulator->rdev; 2615 int ret; 2616 int regulator_curr_mode; 2617 2618 mutex_lock(&rdev->mutex); 2619 2620 /* sanity check */ 2621 if (!rdev->desc->ops->set_mode) { 2622 ret = -EINVAL; 2623 goto out; 2624 } 2625 2626 /* return if the same mode is requested */ 2627 if (rdev->desc->ops->get_mode) { 2628 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2629 if (regulator_curr_mode == mode) { 2630 ret = 0; 2631 goto out; 2632 } 2633 } 2634 2635 /* constraints check */ 2636 ret = regulator_mode_constrain(rdev, &mode); 2637 if (ret < 0) 2638 goto out; 2639 2640 ret = rdev->desc->ops->set_mode(rdev, mode); 2641out: 2642 mutex_unlock(&rdev->mutex); 2643 return ret; 2644} 2645EXPORT_SYMBOL_GPL(regulator_set_mode); 2646 2647static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2648{ 2649 int ret; 2650 2651 mutex_lock(&rdev->mutex); 2652 2653 /* sanity check */ 2654 if (!rdev->desc->ops->get_mode) { 2655 ret = -EINVAL; 2656 goto out; 2657 } 2658 2659 ret = rdev->desc->ops->get_mode(rdev); 2660out: 2661 mutex_unlock(&rdev->mutex); 2662 return ret; 2663} 2664 2665/** 2666 * regulator_get_mode - get regulator operating mode 2667 * @regulator: regulator source 2668 * 2669 * Get the current regulator operating mode. 2670 */ 2671unsigned int regulator_get_mode(struct regulator *regulator) 2672{ 2673 return _regulator_get_mode(regulator->rdev); 2674} 2675EXPORT_SYMBOL_GPL(regulator_get_mode); 2676 2677/** 2678 * regulator_set_optimum_mode - set regulator optimum operating mode 2679 * @regulator: regulator source 2680 * @uA_load: load current 2681 * 2682 * Notifies the regulator core of a new device load. This is then used by 2683 * DRMS (if enabled by constraints) to set the most efficient regulator 2684 * operating mode for the new regulator loading. 2685 * 2686 * Consumer devices notify their supply regulator of the maximum power 2687 * they will require (can be taken from device datasheet in the power 2688 * consumption tables) when they change operational status and hence power 2689 * state. Examples of operational state changes that can affect power 2690 * consumption are :- 2691 * 2692 * o Device is opened / closed. 2693 * o Device I/O is about to begin or has just finished. 2694 * o Device is idling in between work. 2695 * 2696 * This information is also exported via sysfs to userspace. 2697 * 2698 * DRMS will sum the total requested load on the regulator and change 2699 * to the most efficient operating mode if platform constraints allow. 2700 * 2701 * Returns the new regulator mode or error. 2702 */ 2703int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2704{ 2705 struct regulator_dev *rdev = regulator->rdev; 2706 struct regulator *consumer; 2707 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2708 unsigned int mode; 2709 2710 if (rdev->supply) 2711 input_uV = regulator_get_voltage(rdev->supply); 2712 2713 mutex_lock(&rdev->mutex); 2714 2715 /* 2716 * first check to see if we can set modes at all, otherwise just 2717 * tell the consumer everything is OK. 2718 */ 2719 regulator->uA_load = uA_load; 2720 ret = regulator_check_drms(rdev); 2721 if (ret < 0) { 2722 ret = 0; 2723 goto out; 2724 } 2725 2726 if (!rdev->desc->ops->get_optimum_mode) 2727 goto out; 2728 2729 /* 2730 * we can actually do this so any errors are indicators of 2731 * potential real failure. 2732 */ 2733 ret = -EINVAL; 2734 2735 if (!rdev->desc->ops->set_mode) 2736 goto out; 2737 2738 /* get output voltage */ 2739 output_uV = _regulator_get_voltage(rdev); 2740 if (output_uV <= 0) { 2741 rdev_err(rdev, "invalid output voltage found\n"); 2742 goto out; 2743 } 2744 2745 /* No supply? Use constraint voltage */ 2746 if (input_uV <= 0) 2747 input_uV = rdev->constraints->input_uV; 2748 if (input_uV <= 0) { 2749 rdev_err(rdev, "invalid input voltage found\n"); 2750 goto out; 2751 } 2752 2753 /* calc total requested load for this regulator */ 2754 list_for_each_entry(consumer, &rdev->consumer_list, list) 2755 total_uA_load += consumer->uA_load; 2756 2757 mode = rdev->desc->ops->get_optimum_mode(rdev, 2758 input_uV, output_uV, 2759 total_uA_load); 2760 ret = regulator_mode_constrain(rdev, &mode); 2761 if (ret < 0) { 2762 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2763 total_uA_load, input_uV, output_uV); 2764 goto out; 2765 } 2766 2767 ret = rdev->desc->ops->set_mode(rdev, mode); 2768 if (ret < 0) { 2769 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2770 goto out; 2771 } 2772 ret = mode; 2773out: 2774 mutex_unlock(&rdev->mutex); 2775 return ret; 2776} 2777EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2778 2779/** 2780 * regulator_allow_bypass - allow the regulator to go into bypass mode 2781 * 2782 * @regulator: Regulator to configure 2783 * @enable: enable or disable bypass mode 2784 * 2785 * Allow the regulator to go into bypass mode if all other consumers 2786 * for the regulator also enable bypass mode and the machine 2787 * constraints allow this. Bypass mode means that the regulator is 2788 * simply passing the input directly to the output with no regulation. 2789 */ 2790int regulator_allow_bypass(struct regulator *regulator, bool enable) 2791{ 2792 struct regulator_dev *rdev = regulator->rdev; 2793 int ret = 0; 2794 2795 if (!rdev->desc->ops->set_bypass) 2796 return 0; 2797 2798 if (rdev->constraints && 2799 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2800 return 0; 2801 2802 mutex_lock(&rdev->mutex); 2803 2804 if (enable && !regulator->bypass) { 2805 rdev->bypass_count++; 2806 2807 if (rdev->bypass_count == rdev->open_count) { 2808 ret = rdev->desc->ops->set_bypass(rdev, enable); 2809 if (ret != 0) 2810 rdev->bypass_count--; 2811 } 2812 2813 } else if (!enable && regulator->bypass) { 2814 rdev->bypass_count--; 2815 2816 if (rdev->bypass_count != rdev->open_count) { 2817 ret = rdev->desc->ops->set_bypass(rdev, enable); 2818 if (ret != 0) 2819 rdev->bypass_count++; 2820 } 2821 } 2822 2823 if (ret == 0) 2824 regulator->bypass = enable; 2825 2826 mutex_unlock(&rdev->mutex); 2827 2828 return ret; 2829} 2830EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2831 2832/** 2833 * regulator_register_notifier - register regulator event notifier 2834 * @regulator: regulator source 2835 * @nb: notifier block 2836 * 2837 * Register notifier block to receive regulator events. 2838 */ 2839int regulator_register_notifier(struct regulator *regulator, 2840 struct notifier_block *nb) 2841{ 2842 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2843 nb); 2844} 2845EXPORT_SYMBOL_GPL(regulator_register_notifier); 2846 2847/** 2848 * regulator_unregister_notifier - unregister regulator event notifier 2849 * @regulator: regulator source 2850 * @nb: notifier block 2851 * 2852 * Unregister regulator event notifier block. 2853 */ 2854int regulator_unregister_notifier(struct regulator *regulator, 2855 struct notifier_block *nb) 2856{ 2857 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2858 nb); 2859} 2860EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2861 2862/* notify regulator consumers and downstream regulator consumers. 2863 * Note mutex must be held by caller. 2864 */ 2865static void _notifier_call_chain(struct regulator_dev *rdev, 2866 unsigned long event, void *data) 2867{ 2868 /* call rdev chain first */ 2869 blocking_notifier_call_chain(&rdev->notifier, event, data); 2870} 2871 2872/** 2873 * regulator_bulk_get - get multiple regulator consumers 2874 * 2875 * @dev: Device to supply 2876 * @num_consumers: Number of consumers to register 2877 * @consumers: Configuration of consumers; clients are stored here. 2878 * 2879 * @return 0 on success, an errno on failure. 2880 * 2881 * This helper function allows drivers to get several regulator 2882 * consumers in one operation. If any of the regulators cannot be 2883 * acquired then any regulators that were allocated will be freed 2884 * before returning to the caller. 2885 */ 2886int regulator_bulk_get(struct device *dev, int num_consumers, 2887 struct regulator_bulk_data *consumers) 2888{ 2889 int i; 2890 int ret; 2891 2892 for (i = 0; i < num_consumers; i++) 2893 consumers[i].consumer = NULL; 2894 2895 for (i = 0; i < num_consumers; i++) { 2896 consumers[i].consumer = regulator_get(dev, 2897 consumers[i].supply); 2898 if (IS_ERR(consumers[i].consumer)) { 2899 ret = PTR_ERR(consumers[i].consumer); 2900 dev_err(dev, "Failed to get supply '%s': %d\n", 2901 consumers[i].supply, ret); 2902 consumers[i].consumer = NULL; 2903 goto err; 2904 } 2905 } 2906 2907 return 0; 2908 2909err: 2910 while (--i >= 0) 2911 regulator_put(consumers[i].consumer); 2912 2913 return ret; 2914} 2915EXPORT_SYMBOL_GPL(regulator_bulk_get); 2916 2917/** 2918 * devm_regulator_bulk_get - managed get multiple regulator consumers 2919 * 2920 * @dev: Device to supply 2921 * @num_consumers: Number of consumers to register 2922 * @consumers: Configuration of consumers; clients are stored here. 2923 * 2924 * @return 0 on success, an errno on failure. 2925 * 2926 * This helper function allows drivers to get several regulator 2927 * consumers in one operation with management, the regulators will 2928 * automatically be freed when the device is unbound. If any of the 2929 * regulators cannot be acquired then any regulators that were 2930 * allocated will be freed before returning to the caller. 2931 */ 2932int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2933 struct regulator_bulk_data *consumers) 2934{ 2935 int i; 2936 int ret; 2937 2938 for (i = 0; i < num_consumers; i++) 2939 consumers[i].consumer = NULL; 2940 2941 for (i = 0; i < num_consumers; i++) { 2942 consumers[i].consumer = devm_regulator_get(dev, 2943 consumers[i].supply); 2944 if (IS_ERR(consumers[i].consumer)) { 2945 ret = PTR_ERR(consumers[i].consumer); 2946 dev_err(dev, "Failed to get supply '%s': %d\n", 2947 consumers[i].supply, ret); 2948 consumers[i].consumer = NULL; 2949 goto err; 2950 } 2951 } 2952 2953 return 0; 2954 2955err: 2956 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2957 devm_regulator_put(consumers[i].consumer); 2958 2959 return ret; 2960} 2961EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2962 2963static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2964{ 2965 struct regulator_bulk_data *bulk = data; 2966 2967 bulk->ret = regulator_enable(bulk->consumer); 2968} 2969 2970/** 2971 * regulator_bulk_enable - enable multiple regulator consumers 2972 * 2973 * @num_consumers: Number of consumers 2974 * @consumers: Consumer data; clients are stored here. 2975 * @return 0 on success, an errno on failure 2976 * 2977 * This convenience API allows consumers to enable multiple regulator 2978 * clients in a single API call. If any consumers cannot be enabled 2979 * then any others that were enabled will be disabled again prior to 2980 * return. 2981 */ 2982int regulator_bulk_enable(int num_consumers, 2983 struct regulator_bulk_data *consumers) 2984{ 2985 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2986 int i; 2987 int ret = 0; 2988 2989 for (i = 0; i < num_consumers; i++) { 2990 if (consumers[i].consumer->always_on) 2991 consumers[i].ret = 0; 2992 else 2993 async_schedule_domain(regulator_bulk_enable_async, 2994 &consumers[i], &async_domain); 2995 } 2996 2997 async_synchronize_full_domain(&async_domain); 2998 2999 /* If any consumer failed we need to unwind any that succeeded */ 3000 for (i = 0; i < num_consumers; i++) { 3001 if (consumers[i].ret != 0) { 3002 ret = consumers[i].ret; 3003 goto err; 3004 } 3005 } 3006 3007 return 0; 3008 3009err: 3010 for (i = 0; i < num_consumers; i++) { 3011 if (consumers[i].ret < 0) 3012 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3013 consumers[i].ret); 3014 else 3015 regulator_disable(consumers[i].consumer); 3016 } 3017 3018 return ret; 3019} 3020EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3021 3022/** 3023 * regulator_bulk_disable - disable multiple regulator consumers 3024 * 3025 * @num_consumers: Number of consumers 3026 * @consumers: Consumer data; clients are stored here. 3027 * @return 0 on success, an errno on failure 3028 * 3029 * This convenience API allows consumers to disable multiple regulator 3030 * clients in a single API call. If any consumers cannot be disabled 3031 * then any others that were disabled will be enabled again prior to 3032 * return. 3033 */ 3034int regulator_bulk_disable(int num_consumers, 3035 struct regulator_bulk_data *consumers) 3036{ 3037 int i; 3038 int ret, r; 3039 3040 for (i = num_consumers - 1; i >= 0; --i) { 3041 ret = regulator_disable(consumers[i].consumer); 3042 if (ret != 0) 3043 goto err; 3044 } 3045 3046 return 0; 3047 3048err: 3049 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3050 for (++i; i < num_consumers; ++i) { 3051 r = regulator_enable(consumers[i].consumer); 3052 if (r != 0) 3053 pr_err("Failed to reename %s: %d\n", 3054 consumers[i].supply, r); 3055 } 3056 3057 return ret; 3058} 3059EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3060 3061/** 3062 * regulator_bulk_force_disable - force disable multiple regulator consumers 3063 * 3064 * @num_consumers: Number of consumers 3065 * @consumers: Consumer data; clients are stored here. 3066 * @return 0 on success, an errno on failure 3067 * 3068 * This convenience API allows consumers to forcibly disable multiple regulator 3069 * clients in a single API call. 3070 * NOTE: This should be used for situations when device damage will 3071 * likely occur if the regulators are not disabled (e.g. over temp). 3072 * Although regulator_force_disable function call for some consumers can 3073 * return error numbers, the function is called for all consumers. 3074 */ 3075int regulator_bulk_force_disable(int num_consumers, 3076 struct regulator_bulk_data *consumers) 3077{ 3078 int i; 3079 int ret; 3080 3081 for (i = 0; i < num_consumers; i++) 3082 consumers[i].ret = 3083 regulator_force_disable(consumers[i].consumer); 3084 3085 for (i = 0; i < num_consumers; i++) { 3086 if (consumers[i].ret != 0) { 3087 ret = consumers[i].ret; 3088 goto out; 3089 } 3090 } 3091 3092 return 0; 3093out: 3094 return ret; 3095} 3096EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3097 3098/** 3099 * regulator_bulk_free - free multiple regulator consumers 3100 * 3101 * @num_consumers: Number of consumers 3102 * @consumers: Consumer data; clients are stored here. 3103 * 3104 * This convenience API allows consumers to free multiple regulator 3105 * clients in a single API call. 3106 */ 3107void regulator_bulk_free(int num_consumers, 3108 struct regulator_bulk_data *consumers) 3109{ 3110 int i; 3111 3112 for (i = 0; i < num_consumers; i++) { 3113 regulator_put(consumers[i].consumer); 3114 consumers[i].consumer = NULL; 3115 } 3116} 3117EXPORT_SYMBOL_GPL(regulator_bulk_free); 3118 3119/** 3120 * regulator_notifier_call_chain - call regulator event notifier 3121 * @rdev: regulator source 3122 * @event: notifier block 3123 * @data: callback-specific data. 3124 * 3125 * Called by regulator drivers to notify clients a regulator event has 3126 * occurred. We also notify regulator clients downstream. 3127 * Note lock must be held by caller. 3128 */ 3129int regulator_notifier_call_chain(struct regulator_dev *rdev, 3130 unsigned long event, void *data) 3131{ 3132 _notifier_call_chain(rdev, event, data); 3133 return NOTIFY_DONE; 3134 3135} 3136EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3137 3138/** 3139 * regulator_mode_to_status - convert a regulator mode into a status 3140 * 3141 * @mode: Mode to convert 3142 * 3143 * Convert a regulator mode into a status. 3144 */ 3145int regulator_mode_to_status(unsigned int mode) 3146{ 3147 switch (mode) { 3148 case REGULATOR_MODE_FAST: 3149 return REGULATOR_STATUS_FAST; 3150 case REGULATOR_MODE_NORMAL: 3151 return REGULATOR_STATUS_NORMAL; 3152 case REGULATOR_MODE_IDLE: 3153 return REGULATOR_STATUS_IDLE; 3154 case REGULATOR_MODE_STANDBY: 3155 return REGULATOR_STATUS_STANDBY; 3156 default: 3157 return REGULATOR_STATUS_UNDEFINED; 3158 } 3159} 3160EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3161 3162/* 3163 * To avoid cluttering sysfs (and memory) with useless state, only 3164 * create attributes that can be meaningfully displayed. 3165 */ 3166static int add_regulator_attributes(struct regulator_dev *rdev) 3167{ 3168 struct device *dev = &rdev->dev; 3169 struct regulator_ops *ops = rdev->desc->ops; 3170 int status = 0; 3171 3172 /* some attributes need specific methods to be displayed */ 3173 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3174 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3175 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3176 status = device_create_file(dev, &dev_attr_microvolts); 3177 if (status < 0) 3178 return status; 3179 } 3180 if (ops->get_current_limit) { 3181 status = device_create_file(dev, &dev_attr_microamps); 3182 if (status < 0) 3183 return status; 3184 } 3185 if (ops->get_mode) { 3186 status = device_create_file(dev, &dev_attr_opmode); 3187 if (status < 0) 3188 return status; 3189 } 3190 if (rdev->ena_pin || ops->is_enabled) { 3191 status = device_create_file(dev, &dev_attr_state); 3192 if (status < 0) 3193 return status; 3194 } 3195 if (ops->get_status) { 3196 status = device_create_file(dev, &dev_attr_status); 3197 if (status < 0) 3198 return status; 3199 } 3200 if (ops->get_bypass) { 3201 status = device_create_file(dev, &dev_attr_bypass); 3202 if (status < 0) 3203 return status; 3204 } 3205 3206 /* some attributes are type-specific */ 3207 if (rdev->desc->type == REGULATOR_CURRENT) { 3208 status = device_create_file(dev, &dev_attr_requested_microamps); 3209 if (status < 0) 3210 return status; 3211 } 3212 3213 /* all the other attributes exist to support constraints; 3214 * don't show them if there are no constraints, or if the 3215 * relevant supporting methods are missing. 3216 */ 3217 if (!rdev->constraints) 3218 return status; 3219 3220 /* constraints need specific supporting methods */ 3221 if (ops->set_voltage || ops->set_voltage_sel) { 3222 status = device_create_file(dev, &dev_attr_min_microvolts); 3223 if (status < 0) 3224 return status; 3225 status = device_create_file(dev, &dev_attr_max_microvolts); 3226 if (status < 0) 3227 return status; 3228 } 3229 if (ops->set_current_limit) { 3230 status = device_create_file(dev, &dev_attr_min_microamps); 3231 if (status < 0) 3232 return status; 3233 status = device_create_file(dev, &dev_attr_max_microamps); 3234 if (status < 0) 3235 return status; 3236 } 3237 3238 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3239 if (status < 0) 3240 return status; 3241 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3242 if (status < 0) 3243 return status; 3244 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3245 if (status < 0) 3246 return status; 3247 3248 if (ops->set_suspend_voltage) { 3249 status = device_create_file(dev, 3250 &dev_attr_suspend_standby_microvolts); 3251 if (status < 0) 3252 return status; 3253 status = device_create_file(dev, 3254 &dev_attr_suspend_mem_microvolts); 3255 if (status < 0) 3256 return status; 3257 status = device_create_file(dev, 3258 &dev_attr_suspend_disk_microvolts); 3259 if (status < 0) 3260 return status; 3261 } 3262 3263 if (ops->set_suspend_mode) { 3264 status = device_create_file(dev, 3265 &dev_attr_suspend_standby_mode); 3266 if (status < 0) 3267 return status; 3268 status = device_create_file(dev, 3269 &dev_attr_suspend_mem_mode); 3270 if (status < 0) 3271 return status; 3272 status = device_create_file(dev, 3273 &dev_attr_suspend_disk_mode); 3274 if (status < 0) 3275 return status; 3276 } 3277 3278 return status; 3279} 3280 3281static void rdev_init_debugfs(struct regulator_dev *rdev) 3282{ 3283 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3284 if (!rdev->debugfs) { 3285 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3286 return; 3287 } 3288 3289 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3290 &rdev->use_count); 3291 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3292 &rdev->open_count); 3293 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3294 &rdev->bypass_count); 3295} 3296 3297/** 3298 * regulator_register - register regulator 3299 * @regulator_desc: regulator to register 3300 * @config: runtime configuration for regulator 3301 * 3302 * Called by regulator drivers to register a regulator. 3303 * Returns a valid pointer to struct regulator_dev on success 3304 * or an ERR_PTR() on error. 3305 */ 3306struct regulator_dev * 3307regulator_register(const struct regulator_desc *regulator_desc, 3308 const struct regulator_config *config) 3309{ 3310 const struct regulation_constraints *constraints = NULL; 3311 const struct regulator_init_data *init_data; 3312 static atomic_t regulator_no = ATOMIC_INIT(0); 3313 struct regulator_dev *rdev; 3314 struct device *dev; 3315 int ret, i; 3316 const char *supply = NULL; 3317 3318 if (regulator_desc == NULL || config == NULL) 3319 return ERR_PTR(-EINVAL); 3320 3321 dev = config->dev; 3322 WARN_ON(!dev); 3323 3324 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3325 return ERR_PTR(-EINVAL); 3326 3327 if (regulator_desc->type != REGULATOR_VOLTAGE && 3328 regulator_desc->type != REGULATOR_CURRENT) 3329 return ERR_PTR(-EINVAL); 3330 3331 /* Only one of each should be implemented */ 3332 WARN_ON(regulator_desc->ops->get_voltage && 3333 regulator_desc->ops->get_voltage_sel); 3334 WARN_ON(regulator_desc->ops->set_voltage && 3335 regulator_desc->ops->set_voltage_sel); 3336 3337 /* If we're using selectors we must implement list_voltage. */ 3338 if (regulator_desc->ops->get_voltage_sel && 3339 !regulator_desc->ops->list_voltage) { 3340 return ERR_PTR(-EINVAL); 3341 } 3342 if (regulator_desc->ops->set_voltage_sel && 3343 !regulator_desc->ops->list_voltage) { 3344 return ERR_PTR(-EINVAL); 3345 } 3346 3347 init_data = config->init_data; 3348 3349 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3350 if (rdev == NULL) 3351 return ERR_PTR(-ENOMEM); 3352 3353 mutex_lock(®ulator_list_mutex); 3354 3355 mutex_init(&rdev->mutex); 3356 rdev->reg_data = config->driver_data; 3357 rdev->owner = regulator_desc->owner; 3358 rdev->desc = regulator_desc; 3359 if (config->regmap) 3360 rdev->regmap = config->regmap; 3361 else if (dev_get_regmap(dev, NULL)) 3362 rdev->regmap = dev_get_regmap(dev, NULL); 3363 else if (dev->parent) 3364 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3365 INIT_LIST_HEAD(&rdev->consumer_list); 3366 INIT_LIST_HEAD(&rdev->list); 3367 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3368 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3369 3370 /* preform any regulator specific init */ 3371 if (init_data && init_data->regulator_init) { 3372 ret = init_data->regulator_init(rdev->reg_data); 3373 if (ret < 0) 3374 goto clean; 3375 } 3376 3377 /* register with sysfs */ 3378 rdev->dev.class = ®ulator_class; 3379 rdev->dev.of_node = config->of_node; 3380 rdev->dev.parent = dev; 3381 dev_set_name(&rdev->dev, "regulator.%d", 3382 atomic_inc_return(®ulator_no) - 1); 3383 ret = device_register(&rdev->dev); 3384 if (ret != 0) { 3385 put_device(&rdev->dev); 3386 goto clean; 3387 } 3388 3389 dev_set_drvdata(&rdev->dev, rdev); 3390 3391 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3392 ret = regulator_ena_gpio_request(rdev, config); 3393 if (ret != 0) { 3394 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3395 config->ena_gpio, ret); 3396 goto wash; 3397 } 3398 3399 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3400 rdev->ena_gpio_state = 1; 3401 3402 if (config->ena_gpio_invert) 3403 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3404 } 3405 3406 /* set regulator constraints */ 3407 if (init_data) 3408 constraints = &init_data->constraints; 3409 3410 ret = set_machine_constraints(rdev, constraints); 3411 if (ret < 0) 3412 goto scrub; 3413 3414 /* add attributes supported by this regulator */ 3415 ret = add_regulator_attributes(rdev); 3416 if (ret < 0) 3417 goto scrub; 3418 3419 if (init_data && init_data->supply_regulator) 3420 supply = init_data->supply_regulator; 3421 else if (regulator_desc->supply_name) 3422 supply = regulator_desc->supply_name; 3423 3424 if (supply) { 3425 struct regulator_dev *r; 3426 3427 r = regulator_dev_lookup(dev, supply, &ret); 3428 3429 if (ret == -ENODEV) { 3430 /* 3431 * No supply was specified for this regulator and 3432 * there will never be one. 3433 */ 3434 ret = 0; 3435 goto add_dev; 3436 } else if (!r) { 3437 dev_err(dev, "Failed to find supply %s\n", supply); 3438 ret = -EPROBE_DEFER; 3439 goto scrub; 3440 } 3441 3442 ret = set_supply(rdev, r); 3443 if (ret < 0) 3444 goto scrub; 3445 3446 /* Enable supply if rail is enabled */ 3447 if (_regulator_is_enabled(rdev)) { 3448 ret = regulator_enable(rdev->supply); 3449 if (ret < 0) 3450 goto scrub; 3451 } 3452 } 3453 3454add_dev: 3455 /* add consumers devices */ 3456 if (init_data) { 3457 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3458 ret = set_consumer_device_supply(rdev, 3459 init_data->consumer_supplies[i].dev_name, 3460 init_data->consumer_supplies[i].supply); 3461 if (ret < 0) { 3462 dev_err(dev, "Failed to set supply %s\n", 3463 init_data->consumer_supplies[i].supply); 3464 goto unset_supplies; 3465 } 3466 } 3467 } 3468 3469 list_add(&rdev->list, ®ulator_list); 3470 3471 rdev_init_debugfs(rdev); 3472out: 3473 mutex_unlock(®ulator_list_mutex); 3474 return rdev; 3475 3476unset_supplies: 3477 unset_regulator_supplies(rdev); 3478 3479scrub: 3480 if (rdev->supply) 3481 _regulator_put(rdev->supply); 3482 regulator_ena_gpio_free(rdev); 3483 kfree(rdev->constraints); 3484wash: 3485 device_unregister(&rdev->dev); 3486 /* device core frees rdev */ 3487 rdev = ERR_PTR(ret); 3488 goto out; 3489 3490clean: 3491 kfree(rdev); 3492 rdev = ERR_PTR(ret); 3493 goto out; 3494} 3495EXPORT_SYMBOL_GPL(regulator_register); 3496 3497/** 3498 * regulator_unregister - unregister regulator 3499 * @rdev: regulator to unregister 3500 * 3501 * Called by regulator drivers to unregister a regulator. 3502 */ 3503void regulator_unregister(struct regulator_dev *rdev) 3504{ 3505 if (rdev == NULL) 3506 return; 3507 3508 if (rdev->supply) { 3509 while (rdev->use_count--) 3510 regulator_disable(rdev->supply); 3511 regulator_put(rdev->supply); 3512 } 3513 mutex_lock(®ulator_list_mutex); 3514 debugfs_remove_recursive(rdev->debugfs); 3515 flush_work(&rdev->disable_work.work); 3516 WARN_ON(rdev->open_count); 3517 unset_regulator_supplies(rdev); 3518 list_del(&rdev->list); 3519 kfree(rdev->constraints); 3520 regulator_ena_gpio_free(rdev); 3521 device_unregister(&rdev->dev); 3522 mutex_unlock(®ulator_list_mutex); 3523} 3524EXPORT_SYMBOL_GPL(regulator_unregister); 3525 3526/** 3527 * regulator_suspend_prepare - prepare regulators for system wide suspend 3528 * @state: system suspend state 3529 * 3530 * Configure each regulator with it's suspend operating parameters for state. 3531 * This will usually be called by machine suspend code prior to supending. 3532 */ 3533int regulator_suspend_prepare(suspend_state_t state) 3534{ 3535 struct regulator_dev *rdev; 3536 int ret = 0; 3537 3538 /* ON is handled by regulator active state */ 3539 if (state == PM_SUSPEND_ON) 3540 return -EINVAL; 3541 3542 mutex_lock(®ulator_list_mutex); 3543 list_for_each_entry(rdev, ®ulator_list, list) { 3544 3545 mutex_lock(&rdev->mutex); 3546 ret = suspend_prepare(rdev, state); 3547 mutex_unlock(&rdev->mutex); 3548 3549 if (ret < 0) { 3550 rdev_err(rdev, "failed to prepare\n"); 3551 goto out; 3552 } 3553 } 3554out: 3555 mutex_unlock(®ulator_list_mutex); 3556 return ret; 3557} 3558EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3559 3560/** 3561 * regulator_suspend_finish - resume regulators from system wide suspend 3562 * 3563 * Turn on regulators that might be turned off by regulator_suspend_prepare 3564 * and that should be turned on according to the regulators properties. 3565 */ 3566int regulator_suspend_finish(void) 3567{ 3568 struct regulator_dev *rdev; 3569 int ret = 0, error; 3570 3571 mutex_lock(®ulator_list_mutex); 3572 list_for_each_entry(rdev, ®ulator_list, list) { 3573 struct regulator_ops *ops = rdev->desc->ops; 3574 3575 mutex_lock(&rdev->mutex); 3576 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3577 ops->enable) { 3578 error = ops->enable(rdev); 3579 if (error) 3580 ret = error; 3581 } else { 3582 if (!has_full_constraints) 3583 goto unlock; 3584 if (!ops->disable) 3585 goto unlock; 3586 if (!_regulator_is_enabled(rdev)) 3587 goto unlock; 3588 3589 error = ops->disable(rdev); 3590 if (error) 3591 ret = error; 3592 } 3593unlock: 3594 mutex_unlock(&rdev->mutex); 3595 } 3596 mutex_unlock(®ulator_list_mutex); 3597 return ret; 3598} 3599EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3600 3601/** 3602 * regulator_has_full_constraints - the system has fully specified constraints 3603 * 3604 * Calling this function will cause the regulator API to disable all 3605 * regulators which have a zero use count and don't have an always_on 3606 * constraint in a late_initcall. 3607 * 3608 * The intention is that this will become the default behaviour in a 3609 * future kernel release so users are encouraged to use this facility 3610 * now. 3611 */ 3612void regulator_has_full_constraints(void) 3613{ 3614 has_full_constraints = 1; 3615} 3616EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3617 3618/** 3619 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3620 * 3621 * Calling this function will cause the regulator API to provide a 3622 * dummy regulator to consumers if no physical regulator is found, 3623 * allowing most consumers to proceed as though a regulator were 3624 * configured. This allows systems such as those with software 3625 * controllable regulators for the CPU core only to be brought up more 3626 * readily. 3627 */ 3628void regulator_use_dummy_regulator(void) 3629{ 3630 board_wants_dummy_regulator = true; 3631} 3632EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3633 3634/** 3635 * rdev_get_drvdata - get rdev regulator driver data 3636 * @rdev: regulator 3637 * 3638 * Get rdev regulator driver private data. This call can be used in the 3639 * regulator driver context. 3640 */ 3641void *rdev_get_drvdata(struct regulator_dev *rdev) 3642{ 3643 return rdev->reg_data; 3644} 3645EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3646 3647/** 3648 * regulator_get_drvdata - get regulator driver data 3649 * @regulator: regulator 3650 * 3651 * Get regulator driver private data. This call can be used in the consumer 3652 * driver context when non API regulator specific functions need to be called. 3653 */ 3654void *regulator_get_drvdata(struct regulator *regulator) 3655{ 3656 return regulator->rdev->reg_data; 3657} 3658EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3659 3660/** 3661 * regulator_set_drvdata - set regulator driver data 3662 * @regulator: regulator 3663 * @data: data 3664 */ 3665void regulator_set_drvdata(struct regulator *regulator, void *data) 3666{ 3667 regulator->rdev->reg_data = data; 3668} 3669EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3670 3671/** 3672 * regulator_get_id - get regulator ID 3673 * @rdev: regulator 3674 */ 3675int rdev_get_id(struct regulator_dev *rdev) 3676{ 3677 return rdev->desc->id; 3678} 3679EXPORT_SYMBOL_GPL(rdev_get_id); 3680 3681struct device *rdev_get_dev(struct regulator_dev *rdev) 3682{ 3683 return &rdev->dev; 3684} 3685EXPORT_SYMBOL_GPL(rdev_get_dev); 3686 3687void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3688{ 3689 return reg_init_data->driver_data; 3690} 3691EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3692 3693#ifdef CONFIG_DEBUG_FS 3694static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3695 size_t count, loff_t *ppos) 3696{ 3697 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3698 ssize_t len, ret = 0; 3699 struct regulator_map *map; 3700 3701 if (!buf) 3702 return -ENOMEM; 3703 3704 list_for_each_entry(map, ®ulator_map_list, list) { 3705 len = snprintf(buf + ret, PAGE_SIZE - ret, 3706 "%s -> %s.%s\n", 3707 rdev_get_name(map->regulator), map->dev_name, 3708 map->supply); 3709 if (len >= 0) 3710 ret += len; 3711 if (ret > PAGE_SIZE) { 3712 ret = PAGE_SIZE; 3713 break; 3714 } 3715 } 3716 3717 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3718 3719 kfree(buf); 3720 3721 return ret; 3722} 3723#endif 3724 3725static const struct file_operations supply_map_fops = { 3726#ifdef CONFIG_DEBUG_FS 3727 .read = supply_map_read_file, 3728 .llseek = default_llseek, 3729#endif 3730}; 3731 3732static int __init regulator_init(void) 3733{ 3734 int ret; 3735 3736 ret = class_register(®ulator_class); 3737 3738 debugfs_root = debugfs_create_dir("regulator", NULL); 3739 if (!debugfs_root) 3740 pr_warn("regulator: Failed to create debugfs directory\n"); 3741 3742 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3743 &supply_map_fops); 3744 3745 regulator_dummy_init(); 3746 3747 return ret; 3748} 3749 3750/* init early to allow our consumers to complete system booting */ 3751core_initcall(regulator_init); 3752 3753static int __init regulator_init_complete(void) 3754{ 3755 struct regulator_dev *rdev; 3756 struct regulator_ops *ops; 3757 struct regulation_constraints *c; 3758 int enabled, ret; 3759 3760 /* 3761 * Since DT doesn't provide an idiomatic mechanism for 3762 * enabling full constraints and since it's much more natural 3763 * with DT to provide them just assume that a DT enabled 3764 * system has full constraints. 3765 */ 3766 if (of_have_populated_dt()) 3767 has_full_constraints = true; 3768 3769 mutex_lock(®ulator_list_mutex); 3770 3771 /* If we have a full configuration then disable any regulators 3772 * which are not in use or always_on. This will become the 3773 * default behaviour in the future. 3774 */ 3775 list_for_each_entry(rdev, ®ulator_list, list) { 3776 ops = rdev->desc->ops; 3777 c = rdev->constraints; 3778 3779 if (!ops->disable || (c && c->always_on)) 3780 continue; 3781 3782 mutex_lock(&rdev->mutex); 3783 3784 if (rdev->use_count) 3785 goto unlock; 3786 3787 /* If we can't read the status assume it's on. */ 3788 if (ops->is_enabled) 3789 enabled = ops->is_enabled(rdev); 3790 else 3791 enabled = 1; 3792 3793 if (!enabled) 3794 goto unlock; 3795 3796 if (has_full_constraints) { 3797 /* We log since this may kill the system if it 3798 * goes wrong. */ 3799 rdev_info(rdev, "disabling\n"); 3800 ret = ops->disable(rdev); 3801 if (ret != 0) { 3802 rdev_err(rdev, "couldn't disable: %d\n", ret); 3803 } 3804 } else { 3805 /* The intention is that in future we will 3806 * assume that full constraints are provided 3807 * so warn even if we aren't going to do 3808 * anything here. 3809 */ 3810 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3811 } 3812 3813unlock: 3814 mutex_unlock(&rdev->mutex); 3815 } 3816 3817 mutex_unlock(®ulator_list_mutex); 3818 3819 return 0; 3820} 3821late_initcall(regulator_init_complete); 3822