core.c revision 398715ab9414b3b7741c8239c254111f5016821c
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/of.h> 27#include <linux/regmap.h> 28#include <linux/regulator/of_regulator.h> 29#include <linux/regulator/consumer.h> 30#include <linux/regulator/driver.h> 31#include <linux/regulator/machine.h> 32#include <linux/module.h> 33 34#define CREATE_TRACE_POINTS 35#include <trace/events/regulator.h> 36 37#include "dummy.h" 38 39#define rdev_crit(rdev, fmt, ...) \ 40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_err(rdev, fmt, ...) \ 42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_warn(rdev, fmt, ...) \ 44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_info(rdev, fmt, ...) \ 46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_dbg(rdev, fmt, ...) \ 48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49 50static DEFINE_MUTEX(regulator_list_mutex); 51static LIST_HEAD(regulator_list); 52static LIST_HEAD(regulator_map_list); 53static bool has_full_constraints; 54static bool board_wants_dummy_regulator; 55 56static struct dentry *debugfs_root; 57 58/* 59 * struct regulator_map 60 * 61 * Used to provide symbolic supply names to devices. 62 */ 63struct regulator_map { 64 struct list_head list; 65 const char *dev_name; /* The dev_name() for the consumer */ 66 const char *supply; 67 struct regulator_dev *regulator; 68}; 69 70/* 71 * struct regulator 72 * 73 * One for each consumer device. 74 */ 75struct regulator { 76 struct device *dev; 77 struct list_head list; 78 unsigned int always_on:1; 79 int uA_load; 80 int min_uV; 81 int max_uV; 82 char *supply_name; 83 struct device_attribute dev_attr; 84 struct regulator_dev *rdev; 85 struct dentry *debugfs; 86}; 87 88static int _regulator_is_enabled(struct regulator_dev *rdev); 89static int _regulator_disable(struct regulator_dev *rdev); 90static int _regulator_get_voltage(struct regulator_dev *rdev); 91static int _regulator_get_current_limit(struct regulator_dev *rdev); 92static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 93static void _notifier_call_chain(struct regulator_dev *rdev, 94 unsigned long event, void *data); 95static int _regulator_do_set_voltage(struct regulator_dev *rdev, 96 int min_uV, int max_uV); 97static struct regulator *create_regulator(struct regulator_dev *rdev, 98 struct device *dev, 99 const char *supply_name); 100 101static const char *rdev_get_name(struct regulator_dev *rdev) 102{ 103 if (rdev->constraints && rdev->constraints->name) 104 return rdev->constraints->name; 105 else if (rdev->desc->name) 106 return rdev->desc->name; 107 else 108 return ""; 109} 110 111/* gets the regulator for a given consumer device */ 112static struct regulator *get_device_regulator(struct device *dev) 113{ 114 struct regulator *regulator = NULL; 115 struct regulator_dev *rdev; 116 117 mutex_lock(®ulator_list_mutex); 118 list_for_each_entry(rdev, ®ulator_list, list) { 119 mutex_lock(&rdev->mutex); 120 list_for_each_entry(regulator, &rdev->consumer_list, list) { 121 if (regulator->dev == dev) { 122 mutex_unlock(&rdev->mutex); 123 mutex_unlock(®ulator_list_mutex); 124 return regulator; 125 } 126 } 127 mutex_unlock(&rdev->mutex); 128 } 129 mutex_unlock(®ulator_list_mutex); 130 return NULL; 131} 132 133/** 134 * of_get_regulator - get a regulator device node based on supply name 135 * @dev: Device pointer for the consumer (of regulator) device 136 * @supply: regulator supply name 137 * 138 * Extract the regulator device node corresponding to the supply name. 139 * retruns the device node corresponding to the regulator if found, else 140 * returns NULL. 141 */ 142static struct device_node *of_get_regulator(struct device *dev, const char *supply) 143{ 144 struct device_node *regnode = NULL; 145 char prop_name[32]; /* 32 is max size of property name */ 146 147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 148 149 snprintf(prop_name, 32, "%s-supply", supply); 150 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 151 152 if (!regnode) { 153 dev_dbg(dev, "Looking up %s property in node %s failed", 154 prop_name, dev->of_node->full_name); 155 return NULL; 156 } 157 return regnode; 158} 159 160static int _regulator_can_change_status(struct regulator_dev *rdev) 161{ 162 if (!rdev->constraints) 163 return 0; 164 165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 166 return 1; 167 else 168 return 0; 169} 170 171/* Platform voltage constraint check */ 172static int regulator_check_voltage(struct regulator_dev *rdev, 173 int *min_uV, int *max_uV) 174{ 175 BUG_ON(*min_uV > *max_uV); 176 177 if (!rdev->constraints) { 178 rdev_err(rdev, "no constraints\n"); 179 return -ENODEV; 180 } 181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 182 rdev_err(rdev, "operation not allowed\n"); 183 return -EPERM; 184 } 185 186 if (*max_uV > rdev->constraints->max_uV) 187 *max_uV = rdev->constraints->max_uV; 188 if (*min_uV < rdev->constraints->min_uV) 189 *min_uV = rdev->constraints->min_uV; 190 191 if (*min_uV > *max_uV) { 192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 193 *min_uV, *max_uV); 194 return -EINVAL; 195 } 196 197 return 0; 198} 199 200/* Make sure we select a voltage that suits the needs of all 201 * regulator consumers 202 */ 203static int regulator_check_consumers(struct regulator_dev *rdev, 204 int *min_uV, int *max_uV) 205{ 206 struct regulator *regulator; 207 208 list_for_each_entry(regulator, &rdev->consumer_list, list) { 209 /* 210 * Assume consumers that didn't say anything are OK 211 * with anything in the constraint range. 212 */ 213 if (!regulator->min_uV && !regulator->max_uV) 214 continue; 215 216 if (*max_uV > regulator->max_uV) 217 *max_uV = regulator->max_uV; 218 if (*min_uV < regulator->min_uV) 219 *min_uV = regulator->min_uV; 220 } 221 222 if (*min_uV > *max_uV) 223 return -EINVAL; 224 225 return 0; 226} 227 228/* current constraint check */ 229static int regulator_check_current_limit(struct regulator_dev *rdev, 230 int *min_uA, int *max_uA) 231{ 232 BUG_ON(*min_uA > *max_uA); 233 234 if (!rdev->constraints) { 235 rdev_err(rdev, "no constraints\n"); 236 return -ENODEV; 237 } 238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 239 rdev_err(rdev, "operation not allowed\n"); 240 return -EPERM; 241 } 242 243 if (*max_uA > rdev->constraints->max_uA) 244 *max_uA = rdev->constraints->max_uA; 245 if (*min_uA < rdev->constraints->min_uA) 246 *min_uA = rdev->constraints->min_uA; 247 248 if (*min_uA > *max_uA) { 249 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 250 *min_uA, *max_uA); 251 return -EINVAL; 252 } 253 254 return 0; 255} 256 257/* operating mode constraint check */ 258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 259{ 260 switch (*mode) { 261 case REGULATOR_MODE_FAST: 262 case REGULATOR_MODE_NORMAL: 263 case REGULATOR_MODE_IDLE: 264 case REGULATOR_MODE_STANDBY: 265 break; 266 default: 267 rdev_err(rdev, "invalid mode %x specified\n", *mode); 268 return -EINVAL; 269 } 270 271 if (!rdev->constraints) { 272 rdev_err(rdev, "no constraints\n"); 273 return -ENODEV; 274 } 275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 276 rdev_err(rdev, "operation not allowed\n"); 277 return -EPERM; 278 } 279 280 /* The modes are bitmasks, the most power hungry modes having 281 * the lowest values. If the requested mode isn't supported 282 * try higher modes. */ 283 while (*mode) { 284 if (rdev->constraints->valid_modes_mask & *mode) 285 return 0; 286 *mode /= 2; 287 } 288 289 return -EINVAL; 290} 291 292/* dynamic regulator mode switching constraint check */ 293static int regulator_check_drms(struct regulator_dev *rdev) 294{ 295 if (!rdev->constraints) { 296 rdev_err(rdev, "no constraints\n"); 297 return -ENODEV; 298 } 299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 300 rdev_err(rdev, "operation not allowed\n"); 301 return -EPERM; 302 } 303 return 0; 304} 305 306static ssize_t device_requested_uA_show(struct device *dev, 307 struct device_attribute *attr, char *buf) 308{ 309 struct regulator *regulator; 310 311 regulator = get_device_regulator(dev); 312 if (regulator == NULL) 313 return 0; 314 315 return sprintf(buf, "%d\n", regulator->uA_load); 316} 317 318static ssize_t regulator_uV_show(struct device *dev, 319 struct device_attribute *attr, char *buf) 320{ 321 struct regulator_dev *rdev = dev_get_drvdata(dev); 322 ssize_t ret; 323 324 mutex_lock(&rdev->mutex); 325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 326 mutex_unlock(&rdev->mutex); 327 328 return ret; 329} 330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 331 332static ssize_t regulator_uA_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 338} 339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 340 341static ssize_t regulator_name_show(struct device *dev, 342 struct device_attribute *attr, char *buf) 343{ 344 struct regulator_dev *rdev = dev_get_drvdata(dev); 345 346 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 347} 348 349static ssize_t regulator_print_opmode(char *buf, int mode) 350{ 351 switch (mode) { 352 case REGULATOR_MODE_FAST: 353 return sprintf(buf, "fast\n"); 354 case REGULATOR_MODE_NORMAL: 355 return sprintf(buf, "normal\n"); 356 case REGULATOR_MODE_IDLE: 357 return sprintf(buf, "idle\n"); 358 case REGULATOR_MODE_STANDBY: 359 return sprintf(buf, "standby\n"); 360 } 361 return sprintf(buf, "unknown\n"); 362} 363 364static ssize_t regulator_opmode_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366{ 367 struct regulator_dev *rdev = dev_get_drvdata(dev); 368 369 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 370} 371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 372 373static ssize_t regulator_print_state(char *buf, int state) 374{ 375 if (state > 0) 376 return sprintf(buf, "enabled\n"); 377 else if (state == 0) 378 return sprintf(buf, "disabled\n"); 379 else 380 return sprintf(buf, "unknown\n"); 381} 382 383static ssize_t regulator_state_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 ssize_t ret; 388 389 mutex_lock(&rdev->mutex); 390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 391 mutex_unlock(&rdev->mutex); 392 393 return ret; 394} 395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 396 397static ssize_t regulator_status_show(struct device *dev, 398 struct device_attribute *attr, char *buf) 399{ 400 struct regulator_dev *rdev = dev_get_drvdata(dev); 401 int status; 402 char *label; 403 404 status = rdev->desc->ops->get_status(rdev); 405 if (status < 0) 406 return status; 407 408 switch (status) { 409 case REGULATOR_STATUS_OFF: 410 label = "off"; 411 break; 412 case REGULATOR_STATUS_ON: 413 label = "on"; 414 break; 415 case REGULATOR_STATUS_ERROR: 416 label = "error"; 417 break; 418 case REGULATOR_STATUS_FAST: 419 label = "fast"; 420 break; 421 case REGULATOR_STATUS_NORMAL: 422 label = "normal"; 423 break; 424 case REGULATOR_STATUS_IDLE: 425 label = "idle"; 426 break; 427 case REGULATOR_STATUS_STANDBY: 428 label = "standby"; 429 break; 430 default: 431 return -ERANGE; 432 } 433 434 return sprintf(buf, "%s\n", label); 435} 436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 437 438static ssize_t regulator_min_uA_show(struct device *dev, 439 struct device_attribute *attr, char *buf) 440{ 441 struct regulator_dev *rdev = dev_get_drvdata(dev); 442 443 if (!rdev->constraints) 444 return sprintf(buf, "constraint not defined\n"); 445 446 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 447} 448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 449 450static ssize_t regulator_max_uA_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452{ 453 struct regulator_dev *rdev = dev_get_drvdata(dev); 454 455 if (!rdev->constraints) 456 return sprintf(buf, "constraint not defined\n"); 457 458 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 459} 460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 461 462static ssize_t regulator_min_uV_show(struct device *dev, 463 struct device_attribute *attr, char *buf) 464{ 465 struct regulator_dev *rdev = dev_get_drvdata(dev); 466 467 if (!rdev->constraints) 468 return sprintf(buf, "constraint not defined\n"); 469 470 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 471} 472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 473 474static ssize_t regulator_max_uV_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 479 if (!rdev->constraints) 480 return sprintf(buf, "constraint not defined\n"); 481 482 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 483} 484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 485 486static ssize_t regulator_total_uA_show(struct device *dev, 487 struct device_attribute *attr, char *buf) 488{ 489 struct regulator_dev *rdev = dev_get_drvdata(dev); 490 struct regulator *regulator; 491 int uA = 0; 492 493 mutex_lock(&rdev->mutex); 494 list_for_each_entry(regulator, &rdev->consumer_list, list) 495 uA += regulator->uA_load; 496 mutex_unlock(&rdev->mutex); 497 return sprintf(buf, "%d\n", uA); 498} 499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 500 501static ssize_t regulator_num_users_show(struct device *dev, 502 struct device_attribute *attr, char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 return sprintf(buf, "%d\n", rdev->use_count); 506} 507 508static ssize_t regulator_type_show(struct device *dev, 509 struct device_attribute *attr, char *buf) 510{ 511 struct regulator_dev *rdev = dev_get_drvdata(dev); 512 513 switch (rdev->desc->type) { 514 case REGULATOR_VOLTAGE: 515 return sprintf(buf, "voltage\n"); 516 case REGULATOR_CURRENT: 517 return sprintf(buf, "current\n"); 518 } 519 return sprintf(buf, "unknown\n"); 520} 521 522static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 523 struct device_attribute *attr, char *buf) 524{ 525 struct regulator_dev *rdev = dev_get_drvdata(dev); 526 527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 528} 529static DEVICE_ATTR(suspend_mem_microvolts, 0444, 530 regulator_suspend_mem_uV_show, NULL); 531 532static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 533 struct device_attribute *attr, char *buf) 534{ 535 struct regulator_dev *rdev = dev_get_drvdata(dev); 536 537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 538} 539static DEVICE_ATTR(suspend_disk_microvolts, 0444, 540 regulator_suspend_disk_uV_show, NULL); 541 542static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544{ 545 struct regulator_dev *rdev = dev_get_drvdata(dev); 546 547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 548} 549static DEVICE_ATTR(suspend_standby_microvolts, 0444, 550 regulator_suspend_standby_uV_show, NULL); 551 552static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 553 struct device_attribute *attr, char *buf) 554{ 555 struct regulator_dev *rdev = dev_get_drvdata(dev); 556 557 return regulator_print_opmode(buf, 558 rdev->constraints->state_mem.mode); 559} 560static DEVICE_ATTR(suspend_mem_mode, 0444, 561 regulator_suspend_mem_mode_show, NULL); 562 563static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 564 struct device_attribute *attr, char *buf) 565{ 566 struct regulator_dev *rdev = dev_get_drvdata(dev); 567 568 return regulator_print_opmode(buf, 569 rdev->constraints->state_disk.mode); 570} 571static DEVICE_ATTR(suspend_disk_mode, 0444, 572 regulator_suspend_disk_mode_show, NULL); 573 574static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 575 struct device_attribute *attr, char *buf) 576{ 577 struct regulator_dev *rdev = dev_get_drvdata(dev); 578 579 return regulator_print_opmode(buf, 580 rdev->constraints->state_standby.mode); 581} 582static DEVICE_ATTR(suspend_standby_mode, 0444, 583 regulator_suspend_standby_mode_show, NULL); 584 585static ssize_t regulator_suspend_mem_state_show(struct device *dev, 586 struct device_attribute *attr, char *buf) 587{ 588 struct regulator_dev *rdev = dev_get_drvdata(dev); 589 590 return regulator_print_state(buf, 591 rdev->constraints->state_mem.enabled); 592} 593static DEVICE_ATTR(suspend_mem_state, 0444, 594 regulator_suspend_mem_state_show, NULL); 595 596static ssize_t regulator_suspend_disk_state_show(struct device *dev, 597 struct device_attribute *attr, char *buf) 598{ 599 struct regulator_dev *rdev = dev_get_drvdata(dev); 600 601 return regulator_print_state(buf, 602 rdev->constraints->state_disk.enabled); 603} 604static DEVICE_ATTR(suspend_disk_state, 0444, 605 regulator_suspend_disk_state_show, NULL); 606 607static ssize_t regulator_suspend_standby_state_show(struct device *dev, 608 struct device_attribute *attr, char *buf) 609{ 610 struct regulator_dev *rdev = dev_get_drvdata(dev); 611 612 return regulator_print_state(buf, 613 rdev->constraints->state_standby.enabled); 614} 615static DEVICE_ATTR(suspend_standby_state, 0444, 616 regulator_suspend_standby_state_show, NULL); 617 618 619/* 620 * These are the only attributes are present for all regulators. 621 * Other attributes are a function of regulator functionality. 622 */ 623static struct device_attribute regulator_dev_attrs[] = { 624 __ATTR(name, 0444, regulator_name_show, NULL), 625 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 626 __ATTR(type, 0444, regulator_type_show, NULL), 627 __ATTR_NULL, 628}; 629 630static void regulator_dev_release(struct device *dev) 631{ 632 struct regulator_dev *rdev = dev_get_drvdata(dev); 633 kfree(rdev); 634} 635 636static struct class regulator_class = { 637 .name = "regulator", 638 .dev_release = regulator_dev_release, 639 .dev_attrs = regulator_dev_attrs, 640}; 641 642/* Calculate the new optimum regulator operating mode based on the new total 643 * consumer load. All locks held by caller */ 644static void drms_uA_update(struct regulator_dev *rdev) 645{ 646 struct regulator *sibling; 647 int current_uA = 0, output_uV, input_uV, err; 648 unsigned int mode; 649 650 err = regulator_check_drms(rdev); 651 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 652 (!rdev->desc->ops->get_voltage && 653 !rdev->desc->ops->get_voltage_sel) || 654 !rdev->desc->ops->set_mode) 655 return; 656 657 /* get output voltage */ 658 output_uV = _regulator_get_voltage(rdev); 659 if (output_uV <= 0) 660 return; 661 662 /* get input voltage */ 663 input_uV = 0; 664 if (rdev->supply) 665 input_uV = regulator_get_voltage(rdev->supply); 666 if (input_uV <= 0) 667 input_uV = rdev->constraints->input_uV; 668 if (input_uV <= 0) 669 return; 670 671 /* calc total requested load */ 672 list_for_each_entry(sibling, &rdev->consumer_list, list) 673 current_uA += sibling->uA_load; 674 675 /* now get the optimum mode for our new total regulator load */ 676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 677 output_uV, current_uA); 678 679 /* check the new mode is allowed */ 680 err = regulator_mode_constrain(rdev, &mode); 681 if (err == 0) 682 rdev->desc->ops->set_mode(rdev, mode); 683} 684 685static int suspend_set_state(struct regulator_dev *rdev, 686 struct regulator_state *rstate) 687{ 688 int ret = 0; 689 690 /* If we have no suspend mode configration don't set anything; 691 * only warn if the driver implements set_suspend_voltage or 692 * set_suspend_mode callback. 693 */ 694 if (!rstate->enabled && !rstate->disabled) { 695 if (rdev->desc->ops->set_suspend_voltage || 696 rdev->desc->ops->set_suspend_mode) 697 rdev_warn(rdev, "No configuration\n"); 698 return 0; 699 } 700 701 if (rstate->enabled && rstate->disabled) { 702 rdev_err(rdev, "invalid configuration\n"); 703 return -EINVAL; 704 } 705 706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 707 ret = rdev->desc->ops->set_suspend_enable(rdev); 708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 709 ret = rdev->desc->ops->set_suspend_disable(rdev); 710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 711 ret = 0; 712 713 if (ret < 0) { 714 rdev_err(rdev, "failed to enabled/disable\n"); 715 return ret; 716 } 717 718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 720 if (ret < 0) { 721 rdev_err(rdev, "failed to set voltage\n"); 722 return ret; 723 } 724 } 725 726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 728 if (ret < 0) { 729 rdev_err(rdev, "failed to set mode\n"); 730 return ret; 731 } 732 } 733 return ret; 734} 735 736/* locks held by caller */ 737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 738{ 739 if (!rdev->constraints) 740 return -EINVAL; 741 742 switch (state) { 743 case PM_SUSPEND_STANDBY: 744 return suspend_set_state(rdev, 745 &rdev->constraints->state_standby); 746 case PM_SUSPEND_MEM: 747 return suspend_set_state(rdev, 748 &rdev->constraints->state_mem); 749 case PM_SUSPEND_MAX: 750 return suspend_set_state(rdev, 751 &rdev->constraints->state_disk); 752 default: 753 return -EINVAL; 754 } 755} 756 757static void print_constraints(struct regulator_dev *rdev) 758{ 759 struct regulation_constraints *constraints = rdev->constraints; 760 char buf[80] = ""; 761 int count = 0; 762 int ret; 763 764 if (constraints->min_uV && constraints->max_uV) { 765 if (constraints->min_uV == constraints->max_uV) 766 count += sprintf(buf + count, "%d mV ", 767 constraints->min_uV / 1000); 768 else 769 count += sprintf(buf + count, "%d <--> %d mV ", 770 constraints->min_uV / 1000, 771 constraints->max_uV / 1000); 772 } 773 774 if (!constraints->min_uV || 775 constraints->min_uV != constraints->max_uV) { 776 ret = _regulator_get_voltage(rdev); 777 if (ret > 0) 778 count += sprintf(buf + count, "at %d mV ", ret / 1000); 779 } 780 781 if (constraints->uV_offset) 782 count += sprintf(buf, "%dmV offset ", 783 constraints->uV_offset / 1000); 784 785 if (constraints->min_uA && constraints->max_uA) { 786 if (constraints->min_uA == constraints->max_uA) 787 count += sprintf(buf + count, "%d mA ", 788 constraints->min_uA / 1000); 789 else 790 count += sprintf(buf + count, "%d <--> %d mA ", 791 constraints->min_uA / 1000, 792 constraints->max_uA / 1000); 793 } 794 795 if (!constraints->min_uA || 796 constraints->min_uA != constraints->max_uA) { 797 ret = _regulator_get_current_limit(rdev); 798 if (ret > 0) 799 count += sprintf(buf + count, "at %d mA ", ret / 1000); 800 } 801 802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 803 count += sprintf(buf + count, "fast "); 804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 805 count += sprintf(buf + count, "normal "); 806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 807 count += sprintf(buf + count, "idle "); 808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 809 count += sprintf(buf + count, "standby"); 810 811 rdev_info(rdev, "%s\n", buf); 812 813 if ((constraints->min_uV != constraints->max_uV) && 814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 815 rdev_warn(rdev, 816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 817} 818 819static int machine_constraints_voltage(struct regulator_dev *rdev, 820 struct regulation_constraints *constraints) 821{ 822 struct regulator_ops *ops = rdev->desc->ops; 823 int ret; 824 825 /* do we need to apply the constraint voltage */ 826 if (rdev->constraints->apply_uV && 827 rdev->constraints->min_uV == rdev->constraints->max_uV) { 828 ret = _regulator_do_set_voltage(rdev, 829 rdev->constraints->min_uV, 830 rdev->constraints->max_uV); 831 if (ret < 0) { 832 rdev_err(rdev, "failed to apply %duV constraint\n", 833 rdev->constraints->min_uV); 834 return ret; 835 } 836 } 837 838 /* constrain machine-level voltage specs to fit 839 * the actual range supported by this regulator. 840 */ 841 if (ops->list_voltage && rdev->desc->n_voltages) { 842 int count = rdev->desc->n_voltages; 843 int i; 844 int min_uV = INT_MAX; 845 int max_uV = INT_MIN; 846 int cmin = constraints->min_uV; 847 int cmax = constraints->max_uV; 848 849 /* it's safe to autoconfigure fixed-voltage supplies 850 and the constraints are used by list_voltage. */ 851 if (count == 1 && !cmin) { 852 cmin = 1; 853 cmax = INT_MAX; 854 constraints->min_uV = cmin; 855 constraints->max_uV = cmax; 856 } 857 858 /* voltage constraints are optional */ 859 if ((cmin == 0) && (cmax == 0)) 860 return 0; 861 862 /* else require explicit machine-level constraints */ 863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 864 rdev_err(rdev, "invalid voltage constraints\n"); 865 return -EINVAL; 866 } 867 868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 869 for (i = 0; i < count; i++) { 870 int value; 871 872 value = ops->list_voltage(rdev, i); 873 if (value <= 0) 874 continue; 875 876 /* maybe adjust [min_uV..max_uV] */ 877 if (value >= cmin && value < min_uV) 878 min_uV = value; 879 if (value <= cmax && value > max_uV) 880 max_uV = value; 881 } 882 883 /* final: [min_uV..max_uV] valid iff constraints valid */ 884 if (max_uV < min_uV) { 885 rdev_err(rdev, "unsupportable voltage constraints\n"); 886 return -EINVAL; 887 } 888 889 /* use regulator's subset of machine constraints */ 890 if (constraints->min_uV < min_uV) { 891 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 892 constraints->min_uV, min_uV); 893 constraints->min_uV = min_uV; 894 } 895 if (constraints->max_uV > max_uV) { 896 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 897 constraints->max_uV, max_uV); 898 constraints->max_uV = max_uV; 899 } 900 } 901 902 return 0; 903} 904 905/** 906 * set_machine_constraints - sets regulator constraints 907 * @rdev: regulator source 908 * @constraints: constraints to apply 909 * 910 * Allows platform initialisation code to define and constrain 911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 912 * Constraints *must* be set by platform code in order for some 913 * regulator operations to proceed i.e. set_voltage, set_current_limit, 914 * set_mode. 915 */ 916static int set_machine_constraints(struct regulator_dev *rdev, 917 const struct regulation_constraints *constraints) 918{ 919 int ret = 0; 920 struct regulator_ops *ops = rdev->desc->ops; 921 922 if (constraints) 923 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 924 GFP_KERNEL); 925 else 926 rdev->constraints = kzalloc(sizeof(*constraints), 927 GFP_KERNEL); 928 if (!rdev->constraints) 929 return -ENOMEM; 930 931 ret = machine_constraints_voltage(rdev, rdev->constraints); 932 if (ret != 0) 933 goto out; 934 935 /* do we need to setup our suspend state */ 936 if (rdev->constraints->initial_state) { 937 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 938 if (ret < 0) { 939 rdev_err(rdev, "failed to set suspend state\n"); 940 goto out; 941 } 942 } 943 944 if (rdev->constraints->initial_mode) { 945 if (!ops->set_mode) { 946 rdev_err(rdev, "no set_mode operation\n"); 947 ret = -EINVAL; 948 goto out; 949 } 950 951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 952 if (ret < 0) { 953 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 954 goto out; 955 } 956 } 957 958 /* If the constraints say the regulator should be on at this point 959 * and we have control then make sure it is enabled. 960 */ 961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 962 ops->enable) { 963 ret = ops->enable(rdev); 964 if (ret < 0) { 965 rdev_err(rdev, "failed to enable\n"); 966 goto out; 967 } 968 } 969 970 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 971 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 972 if (ret < 0) { 973 rdev_err(rdev, "failed to set ramp_delay\n"); 974 goto out; 975 } 976 } 977 978 print_constraints(rdev); 979 return 0; 980out: 981 kfree(rdev->constraints); 982 rdev->constraints = NULL; 983 return ret; 984} 985 986/** 987 * set_supply - set regulator supply regulator 988 * @rdev: regulator name 989 * @supply_rdev: supply regulator name 990 * 991 * Called by platform initialisation code to set the supply regulator for this 992 * regulator. This ensures that a regulators supply will also be enabled by the 993 * core if it's child is enabled. 994 */ 995static int set_supply(struct regulator_dev *rdev, 996 struct regulator_dev *supply_rdev) 997{ 998 int err; 999 1000 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1001 1002 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1003 if (rdev->supply == NULL) { 1004 err = -ENOMEM; 1005 return err; 1006 } 1007 1008 return 0; 1009} 1010 1011/** 1012 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1013 * @rdev: regulator source 1014 * @consumer_dev_name: dev_name() string for device supply applies to 1015 * @supply: symbolic name for supply 1016 * 1017 * Allows platform initialisation code to map physical regulator 1018 * sources to symbolic names for supplies for use by devices. Devices 1019 * should use these symbolic names to request regulators, avoiding the 1020 * need to provide board-specific regulator names as platform data. 1021 */ 1022static int set_consumer_device_supply(struct regulator_dev *rdev, 1023 const char *consumer_dev_name, 1024 const char *supply) 1025{ 1026 struct regulator_map *node; 1027 int has_dev; 1028 1029 if (supply == NULL) 1030 return -EINVAL; 1031 1032 if (consumer_dev_name != NULL) 1033 has_dev = 1; 1034 else 1035 has_dev = 0; 1036 1037 list_for_each_entry(node, ®ulator_map_list, list) { 1038 if (node->dev_name && consumer_dev_name) { 1039 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1040 continue; 1041 } else if (node->dev_name || consumer_dev_name) { 1042 continue; 1043 } 1044 1045 if (strcmp(node->supply, supply) != 0) 1046 continue; 1047 1048 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1049 consumer_dev_name, 1050 dev_name(&node->regulator->dev), 1051 node->regulator->desc->name, 1052 supply, 1053 dev_name(&rdev->dev), rdev_get_name(rdev)); 1054 return -EBUSY; 1055 } 1056 1057 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1058 if (node == NULL) 1059 return -ENOMEM; 1060 1061 node->regulator = rdev; 1062 node->supply = supply; 1063 1064 if (has_dev) { 1065 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1066 if (node->dev_name == NULL) { 1067 kfree(node); 1068 return -ENOMEM; 1069 } 1070 } 1071 1072 list_add(&node->list, ®ulator_map_list); 1073 return 0; 1074} 1075 1076static void unset_regulator_supplies(struct regulator_dev *rdev) 1077{ 1078 struct regulator_map *node, *n; 1079 1080 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1081 if (rdev == node->regulator) { 1082 list_del(&node->list); 1083 kfree(node->dev_name); 1084 kfree(node); 1085 } 1086 } 1087} 1088 1089#define REG_STR_SIZE 64 1090 1091static struct regulator *create_regulator(struct regulator_dev *rdev, 1092 struct device *dev, 1093 const char *supply_name) 1094{ 1095 struct regulator *regulator; 1096 char buf[REG_STR_SIZE]; 1097 int err, size; 1098 1099 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1100 if (regulator == NULL) 1101 return NULL; 1102 1103 mutex_lock(&rdev->mutex); 1104 regulator->rdev = rdev; 1105 list_add(®ulator->list, &rdev->consumer_list); 1106 1107 if (dev) { 1108 /* create a 'requested_microamps_name' sysfs entry */ 1109 size = scnprintf(buf, REG_STR_SIZE, 1110 "microamps_requested_%s-%s", 1111 dev_name(dev), supply_name); 1112 if (size >= REG_STR_SIZE) 1113 goto overflow_err; 1114 1115 regulator->dev = dev; 1116 sysfs_attr_init(®ulator->dev_attr.attr); 1117 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1118 if (regulator->dev_attr.attr.name == NULL) 1119 goto attr_name_err; 1120 1121 regulator->dev_attr.attr.mode = 0444; 1122 regulator->dev_attr.show = device_requested_uA_show; 1123 err = device_create_file(dev, ®ulator->dev_attr); 1124 if (err < 0) { 1125 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1126 goto attr_name_err; 1127 } 1128 1129 /* also add a link to the device sysfs entry */ 1130 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1131 dev->kobj.name, supply_name); 1132 if (size >= REG_STR_SIZE) 1133 goto attr_err; 1134 1135 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1136 if (regulator->supply_name == NULL) 1137 goto attr_err; 1138 1139 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1140 buf); 1141 if (err) { 1142 rdev_warn(rdev, "could not add device link %s err %d\n", 1143 dev->kobj.name, err); 1144 goto link_name_err; 1145 } 1146 } else { 1147 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1148 if (regulator->supply_name == NULL) 1149 goto attr_err; 1150 } 1151 1152 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1153 rdev->debugfs); 1154 if (!regulator->debugfs) { 1155 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1156 } else { 1157 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1158 ®ulator->uA_load); 1159 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1160 ®ulator->min_uV); 1161 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1162 ®ulator->max_uV); 1163 } 1164 1165 /* 1166 * Check now if the regulator is an always on regulator - if 1167 * it is then we don't need to do nearly so much work for 1168 * enable/disable calls. 1169 */ 1170 if (!_regulator_can_change_status(rdev) && 1171 _regulator_is_enabled(rdev)) 1172 regulator->always_on = true; 1173 1174 mutex_unlock(&rdev->mutex); 1175 return regulator; 1176link_name_err: 1177 kfree(regulator->supply_name); 1178attr_err: 1179 device_remove_file(regulator->dev, ®ulator->dev_attr); 1180attr_name_err: 1181 kfree(regulator->dev_attr.attr.name); 1182overflow_err: 1183 list_del(®ulator->list); 1184 kfree(regulator); 1185 mutex_unlock(&rdev->mutex); 1186 return NULL; 1187} 1188 1189static int _regulator_get_enable_time(struct regulator_dev *rdev) 1190{ 1191 if (!rdev->desc->ops->enable_time) 1192 return 0; 1193 return rdev->desc->ops->enable_time(rdev); 1194} 1195 1196static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1197 const char *supply, 1198 int *ret) 1199{ 1200 struct regulator_dev *r; 1201 struct device_node *node; 1202 struct regulator_map *map; 1203 const char *devname = NULL; 1204 1205 /* first do a dt based lookup */ 1206 if (dev && dev->of_node) { 1207 node = of_get_regulator(dev, supply); 1208 if (node) { 1209 list_for_each_entry(r, ®ulator_list, list) 1210 if (r->dev.parent && 1211 node == r->dev.of_node) 1212 return r; 1213 } else { 1214 /* 1215 * If we couldn't even get the node then it's 1216 * not just that the device didn't register 1217 * yet, there's no node and we'll never 1218 * succeed. 1219 */ 1220 *ret = -ENODEV; 1221 } 1222 } 1223 1224 /* if not found, try doing it non-dt way */ 1225 if (dev) 1226 devname = dev_name(dev); 1227 1228 list_for_each_entry(r, ®ulator_list, list) 1229 if (strcmp(rdev_get_name(r), supply) == 0) 1230 return r; 1231 1232 list_for_each_entry(map, ®ulator_map_list, list) { 1233 /* If the mapping has a device set up it must match */ 1234 if (map->dev_name && 1235 (!devname || strcmp(map->dev_name, devname))) 1236 continue; 1237 1238 if (strcmp(map->supply, supply) == 0) 1239 return map->regulator; 1240 } 1241 1242 1243 return NULL; 1244} 1245 1246/* Internal regulator request function */ 1247static struct regulator *_regulator_get(struct device *dev, const char *id, 1248 int exclusive) 1249{ 1250 struct regulator_dev *rdev; 1251 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1252 const char *devname = NULL; 1253 int ret; 1254 1255 if (id == NULL) { 1256 pr_err("get() with no identifier\n"); 1257 return regulator; 1258 } 1259 1260 if (dev) 1261 devname = dev_name(dev); 1262 1263 mutex_lock(®ulator_list_mutex); 1264 1265 rdev = regulator_dev_lookup(dev, id, &ret); 1266 if (rdev) 1267 goto found; 1268 1269 if (board_wants_dummy_regulator) { 1270 rdev = dummy_regulator_rdev; 1271 goto found; 1272 } 1273 1274#ifdef CONFIG_REGULATOR_DUMMY 1275 if (!devname) 1276 devname = "deviceless"; 1277 1278 /* If the board didn't flag that it was fully constrained then 1279 * substitute in a dummy regulator so consumers can continue. 1280 */ 1281 if (!has_full_constraints) { 1282 pr_warn("%s supply %s not found, using dummy regulator\n", 1283 devname, id); 1284 rdev = dummy_regulator_rdev; 1285 goto found; 1286 } 1287#endif 1288 1289 mutex_unlock(®ulator_list_mutex); 1290 return regulator; 1291 1292found: 1293 if (rdev->exclusive) { 1294 regulator = ERR_PTR(-EPERM); 1295 goto out; 1296 } 1297 1298 if (exclusive && rdev->open_count) { 1299 regulator = ERR_PTR(-EBUSY); 1300 goto out; 1301 } 1302 1303 if (!try_module_get(rdev->owner)) 1304 goto out; 1305 1306 regulator = create_regulator(rdev, dev, id); 1307 if (regulator == NULL) { 1308 regulator = ERR_PTR(-ENOMEM); 1309 module_put(rdev->owner); 1310 goto out; 1311 } 1312 1313 rdev->open_count++; 1314 if (exclusive) { 1315 rdev->exclusive = 1; 1316 1317 ret = _regulator_is_enabled(rdev); 1318 if (ret > 0) 1319 rdev->use_count = 1; 1320 else 1321 rdev->use_count = 0; 1322 } 1323 1324out: 1325 mutex_unlock(®ulator_list_mutex); 1326 1327 return regulator; 1328} 1329 1330/** 1331 * regulator_get - lookup and obtain a reference to a regulator. 1332 * @dev: device for regulator "consumer" 1333 * @id: Supply name or regulator ID. 1334 * 1335 * Returns a struct regulator corresponding to the regulator producer, 1336 * or IS_ERR() condition containing errno. 1337 * 1338 * Use of supply names configured via regulator_set_device_supply() is 1339 * strongly encouraged. It is recommended that the supply name used 1340 * should match the name used for the supply and/or the relevant 1341 * device pins in the datasheet. 1342 */ 1343struct regulator *regulator_get(struct device *dev, const char *id) 1344{ 1345 return _regulator_get(dev, id, 0); 1346} 1347EXPORT_SYMBOL_GPL(regulator_get); 1348 1349static void devm_regulator_release(struct device *dev, void *res) 1350{ 1351 regulator_put(*(struct regulator **)res); 1352} 1353 1354/** 1355 * devm_regulator_get - Resource managed regulator_get() 1356 * @dev: device for regulator "consumer" 1357 * @id: Supply name or regulator ID. 1358 * 1359 * Managed regulator_get(). Regulators returned from this function are 1360 * automatically regulator_put() on driver detach. See regulator_get() for more 1361 * information. 1362 */ 1363struct regulator *devm_regulator_get(struct device *dev, const char *id) 1364{ 1365 struct regulator **ptr, *regulator; 1366 1367 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1368 if (!ptr) 1369 return ERR_PTR(-ENOMEM); 1370 1371 regulator = regulator_get(dev, id); 1372 if (!IS_ERR(regulator)) { 1373 *ptr = regulator; 1374 devres_add(dev, ptr); 1375 } else { 1376 devres_free(ptr); 1377 } 1378 1379 return regulator; 1380} 1381EXPORT_SYMBOL_GPL(devm_regulator_get); 1382 1383/** 1384 * regulator_get_exclusive - obtain exclusive access to a regulator. 1385 * @dev: device for regulator "consumer" 1386 * @id: Supply name or regulator ID. 1387 * 1388 * Returns a struct regulator corresponding to the regulator producer, 1389 * or IS_ERR() condition containing errno. Other consumers will be 1390 * unable to obtain this reference is held and the use count for the 1391 * regulator will be initialised to reflect the current state of the 1392 * regulator. 1393 * 1394 * This is intended for use by consumers which cannot tolerate shared 1395 * use of the regulator such as those which need to force the 1396 * regulator off for correct operation of the hardware they are 1397 * controlling. 1398 * 1399 * Use of supply names configured via regulator_set_device_supply() is 1400 * strongly encouraged. It is recommended that the supply name used 1401 * should match the name used for the supply and/or the relevant 1402 * device pins in the datasheet. 1403 */ 1404struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1405{ 1406 return _regulator_get(dev, id, 1); 1407} 1408EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1409 1410/** 1411 * regulator_put - "free" the regulator source 1412 * @regulator: regulator source 1413 * 1414 * Note: drivers must ensure that all regulator_enable calls made on this 1415 * regulator source are balanced by regulator_disable calls prior to calling 1416 * this function. 1417 */ 1418void regulator_put(struct regulator *regulator) 1419{ 1420 struct regulator_dev *rdev; 1421 1422 if (regulator == NULL || IS_ERR(regulator)) 1423 return; 1424 1425 mutex_lock(®ulator_list_mutex); 1426 rdev = regulator->rdev; 1427 1428 debugfs_remove_recursive(regulator->debugfs); 1429 1430 /* remove any sysfs entries */ 1431 if (regulator->dev) { 1432 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1433 device_remove_file(regulator->dev, ®ulator->dev_attr); 1434 kfree(regulator->dev_attr.attr.name); 1435 } 1436 kfree(regulator->supply_name); 1437 list_del(®ulator->list); 1438 kfree(regulator); 1439 1440 rdev->open_count--; 1441 rdev->exclusive = 0; 1442 1443 module_put(rdev->owner); 1444 mutex_unlock(®ulator_list_mutex); 1445} 1446EXPORT_SYMBOL_GPL(regulator_put); 1447 1448static int devm_regulator_match(struct device *dev, void *res, void *data) 1449{ 1450 struct regulator **r = res; 1451 if (!r || !*r) { 1452 WARN_ON(!r || !*r); 1453 return 0; 1454 } 1455 return *r == data; 1456} 1457 1458/** 1459 * devm_regulator_put - Resource managed regulator_put() 1460 * @regulator: regulator to free 1461 * 1462 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1463 * this function will not need to be called and the resource management 1464 * code will ensure that the resource is freed. 1465 */ 1466void devm_regulator_put(struct regulator *regulator) 1467{ 1468 int rc; 1469 1470 rc = devres_release(regulator->dev, devm_regulator_release, 1471 devm_regulator_match, regulator); 1472 if (rc == 0) 1473 regulator_put(regulator); 1474 else 1475 WARN_ON(rc); 1476} 1477EXPORT_SYMBOL_GPL(devm_regulator_put); 1478 1479/* locks held by regulator_enable() */ 1480static int _regulator_enable(struct regulator_dev *rdev) 1481{ 1482 int ret, delay; 1483 1484 /* check voltage and requested load before enabling */ 1485 if (rdev->constraints && 1486 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1487 drms_uA_update(rdev); 1488 1489 if (rdev->use_count == 0) { 1490 /* The regulator may on if it's not switchable or left on */ 1491 ret = _regulator_is_enabled(rdev); 1492 if (ret == -EINVAL || ret == 0) { 1493 if (!_regulator_can_change_status(rdev)) 1494 return -EPERM; 1495 1496 if (!rdev->desc->ops->enable) 1497 return -EINVAL; 1498 1499 /* Query before enabling in case configuration 1500 * dependent. */ 1501 ret = _regulator_get_enable_time(rdev); 1502 if (ret >= 0) { 1503 delay = ret; 1504 } else { 1505 rdev_warn(rdev, "enable_time() failed: %d\n", 1506 ret); 1507 delay = 0; 1508 } 1509 1510 trace_regulator_enable(rdev_get_name(rdev)); 1511 1512 /* Allow the regulator to ramp; it would be useful 1513 * to extend this for bulk operations so that the 1514 * regulators can ramp together. */ 1515 ret = rdev->desc->ops->enable(rdev); 1516 if (ret < 0) 1517 return ret; 1518 1519 trace_regulator_enable_delay(rdev_get_name(rdev)); 1520 1521 if (delay >= 1000) { 1522 mdelay(delay / 1000); 1523 udelay(delay % 1000); 1524 } else if (delay) { 1525 udelay(delay); 1526 } 1527 1528 trace_regulator_enable_complete(rdev_get_name(rdev)); 1529 1530 } else if (ret < 0) { 1531 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1532 return ret; 1533 } 1534 /* Fallthrough on positive return values - already enabled */ 1535 } 1536 1537 rdev->use_count++; 1538 1539 return 0; 1540} 1541 1542/** 1543 * regulator_enable - enable regulator output 1544 * @regulator: regulator source 1545 * 1546 * Request that the regulator be enabled with the regulator output at 1547 * the predefined voltage or current value. Calls to regulator_enable() 1548 * must be balanced with calls to regulator_disable(). 1549 * 1550 * NOTE: the output value can be set by other drivers, boot loader or may be 1551 * hardwired in the regulator. 1552 */ 1553int regulator_enable(struct regulator *regulator) 1554{ 1555 struct regulator_dev *rdev = regulator->rdev; 1556 int ret = 0; 1557 1558 if (regulator->always_on) 1559 return 0; 1560 1561 if (rdev->supply) { 1562 ret = regulator_enable(rdev->supply); 1563 if (ret != 0) 1564 return ret; 1565 } 1566 1567 mutex_lock(&rdev->mutex); 1568 ret = _regulator_enable(rdev); 1569 mutex_unlock(&rdev->mutex); 1570 1571 if (ret != 0 && rdev->supply) 1572 regulator_disable(rdev->supply); 1573 1574 return ret; 1575} 1576EXPORT_SYMBOL_GPL(regulator_enable); 1577 1578/* locks held by regulator_disable() */ 1579static int _regulator_disable(struct regulator_dev *rdev) 1580{ 1581 int ret = 0; 1582 1583 if (WARN(rdev->use_count <= 0, 1584 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1585 return -EIO; 1586 1587 /* are we the last user and permitted to disable ? */ 1588 if (rdev->use_count == 1 && 1589 (rdev->constraints && !rdev->constraints->always_on)) { 1590 1591 /* we are last user */ 1592 if (_regulator_can_change_status(rdev) && 1593 rdev->desc->ops->disable) { 1594 trace_regulator_disable(rdev_get_name(rdev)); 1595 1596 ret = rdev->desc->ops->disable(rdev); 1597 if (ret < 0) { 1598 rdev_err(rdev, "failed to disable\n"); 1599 return ret; 1600 } 1601 1602 trace_regulator_disable_complete(rdev_get_name(rdev)); 1603 1604 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1605 NULL); 1606 } 1607 1608 rdev->use_count = 0; 1609 } else if (rdev->use_count > 1) { 1610 1611 if (rdev->constraints && 1612 (rdev->constraints->valid_ops_mask & 1613 REGULATOR_CHANGE_DRMS)) 1614 drms_uA_update(rdev); 1615 1616 rdev->use_count--; 1617 } 1618 1619 return ret; 1620} 1621 1622/** 1623 * regulator_disable - disable regulator output 1624 * @regulator: regulator source 1625 * 1626 * Disable the regulator output voltage or current. Calls to 1627 * regulator_enable() must be balanced with calls to 1628 * regulator_disable(). 1629 * 1630 * NOTE: this will only disable the regulator output if no other consumer 1631 * devices have it enabled, the regulator device supports disabling and 1632 * machine constraints permit this operation. 1633 */ 1634int regulator_disable(struct regulator *regulator) 1635{ 1636 struct regulator_dev *rdev = regulator->rdev; 1637 int ret = 0; 1638 1639 if (regulator->always_on) 1640 return 0; 1641 1642 mutex_lock(&rdev->mutex); 1643 ret = _regulator_disable(rdev); 1644 mutex_unlock(&rdev->mutex); 1645 1646 if (ret == 0 && rdev->supply) 1647 regulator_disable(rdev->supply); 1648 1649 return ret; 1650} 1651EXPORT_SYMBOL_GPL(regulator_disable); 1652 1653/* locks held by regulator_force_disable() */ 1654static int _regulator_force_disable(struct regulator_dev *rdev) 1655{ 1656 int ret = 0; 1657 1658 /* force disable */ 1659 if (rdev->desc->ops->disable) { 1660 /* ah well, who wants to live forever... */ 1661 ret = rdev->desc->ops->disable(rdev); 1662 if (ret < 0) { 1663 rdev_err(rdev, "failed to force disable\n"); 1664 return ret; 1665 } 1666 /* notify other consumers that power has been forced off */ 1667 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1668 REGULATOR_EVENT_DISABLE, NULL); 1669 } 1670 1671 return ret; 1672} 1673 1674/** 1675 * regulator_force_disable - force disable regulator output 1676 * @regulator: regulator source 1677 * 1678 * Forcibly disable the regulator output voltage or current. 1679 * NOTE: this *will* disable the regulator output even if other consumer 1680 * devices have it enabled. This should be used for situations when device 1681 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1682 */ 1683int regulator_force_disable(struct regulator *regulator) 1684{ 1685 struct regulator_dev *rdev = regulator->rdev; 1686 int ret; 1687 1688 mutex_lock(&rdev->mutex); 1689 regulator->uA_load = 0; 1690 ret = _regulator_force_disable(regulator->rdev); 1691 mutex_unlock(&rdev->mutex); 1692 1693 if (rdev->supply) 1694 while (rdev->open_count--) 1695 regulator_disable(rdev->supply); 1696 1697 return ret; 1698} 1699EXPORT_SYMBOL_GPL(regulator_force_disable); 1700 1701static void regulator_disable_work(struct work_struct *work) 1702{ 1703 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1704 disable_work.work); 1705 int count, i, ret; 1706 1707 mutex_lock(&rdev->mutex); 1708 1709 BUG_ON(!rdev->deferred_disables); 1710 1711 count = rdev->deferred_disables; 1712 rdev->deferred_disables = 0; 1713 1714 for (i = 0; i < count; i++) { 1715 ret = _regulator_disable(rdev); 1716 if (ret != 0) 1717 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1718 } 1719 1720 mutex_unlock(&rdev->mutex); 1721 1722 if (rdev->supply) { 1723 for (i = 0; i < count; i++) { 1724 ret = regulator_disable(rdev->supply); 1725 if (ret != 0) { 1726 rdev_err(rdev, 1727 "Supply disable failed: %d\n", ret); 1728 } 1729 } 1730 } 1731} 1732 1733/** 1734 * regulator_disable_deferred - disable regulator output with delay 1735 * @regulator: regulator source 1736 * @ms: miliseconds until the regulator is disabled 1737 * 1738 * Execute regulator_disable() on the regulator after a delay. This 1739 * is intended for use with devices that require some time to quiesce. 1740 * 1741 * NOTE: this will only disable the regulator output if no other consumer 1742 * devices have it enabled, the regulator device supports disabling and 1743 * machine constraints permit this operation. 1744 */ 1745int regulator_disable_deferred(struct regulator *regulator, int ms) 1746{ 1747 struct regulator_dev *rdev = regulator->rdev; 1748 int ret; 1749 1750 if (regulator->always_on) 1751 return 0; 1752 1753 mutex_lock(&rdev->mutex); 1754 rdev->deferred_disables++; 1755 mutex_unlock(&rdev->mutex); 1756 1757 ret = schedule_delayed_work(&rdev->disable_work, 1758 msecs_to_jiffies(ms)); 1759 if (ret < 0) 1760 return ret; 1761 else 1762 return 0; 1763} 1764EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1765 1766/** 1767 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1768 * 1769 * @rdev: regulator to operate on 1770 * 1771 * Regulators that use regmap for their register I/O can set the 1772 * enable_reg and enable_mask fields in their descriptor and then use 1773 * this as their is_enabled operation, saving some code. 1774 */ 1775int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1776{ 1777 unsigned int val; 1778 int ret; 1779 1780 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1781 if (ret != 0) 1782 return ret; 1783 1784 return (val & rdev->desc->enable_mask) != 0; 1785} 1786EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1787 1788/** 1789 * regulator_enable_regmap - standard enable() for regmap users 1790 * 1791 * @rdev: regulator to operate on 1792 * 1793 * Regulators that use regmap for their register I/O can set the 1794 * enable_reg and enable_mask fields in their descriptor and then use 1795 * this as their enable() operation, saving some code. 1796 */ 1797int regulator_enable_regmap(struct regulator_dev *rdev) 1798{ 1799 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1800 rdev->desc->enable_mask, 1801 rdev->desc->enable_mask); 1802} 1803EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1804 1805/** 1806 * regulator_disable_regmap - standard disable() for regmap users 1807 * 1808 * @rdev: regulator to operate on 1809 * 1810 * Regulators that use regmap for their register I/O can set the 1811 * enable_reg and enable_mask fields in their descriptor and then use 1812 * this as their disable() operation, saving some code. 1813 */ 1814int regulator_disable_regmap(struct regulator_dev *rdev) 1815{ 1816 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1817 rdev->desc->enable_mask, 0); 1818} 1819EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1820 1821static int _regulator_is_enabled(struct regulator_dev *rdev) 1822{ 1823 /* If we don't know then assume that the regulator is always on */ 1824 if (!rdev->desc->ops->is_enabled) 1825 return 1; 1826 1827 return rdev->desc->ops->is_enabled(rdev); 1828} 1829 1830/** 1831 * regulator_is_enabled - is the regulator output enabled 1832 * @regulator: regulator source 1833 * 1834 * Returns positive if the regulator driver backing the source/client 1835 * has requested that the device be enabled, zero if it hasn't, else a 1836 * negative errno code. 1837 * 1838 * Note that the device backing this regulator handle can have multiple 1839 * users, so it might be enabled even if regulator_enable() was never 1840 * called for this particular source. 1841 */ 1842int regulator_is_enabled(struct regulator *regulator) 1843{ 1844 int ret; 1845 1846 if (regulator->always_on) 1847 return 1; 1848 1849 mutex_lock(®ulator->rdev->mutex); 1850 ret = _regulator_is_enabled(regulator->rdev); 1851 mutex_unlock(®ulator->rdev->mutex); 1852 1853 return ret; 1854} 1855EXPORT_SYMBOL_GPL(regulator_is_enabled); 1856 1857/** 1858 * regulator_count_voltages - count regulator_list_voltage() selectors 1859 * @regulator: regulator source 1860 * 1861 * Returns number of selectors, or negative errno. Selectors are 1862 * numbered starting at zero, and typically correspond to bitfields 1863 * in hardware registers. 1864 */ 1865int regulator_count_voltages(struct regulator *regulator) 1866{ 1867 struct regulator_dev *rdev = regulator->rdev; 1868 1869 return rdev->desc->n_voltages ? : -EINVAL; 1870} 1871EXPORT_SYMBOL_GPL(regulator_count_voltages); 1872 1873/** 1874 * regulator_list_voltage_linear - List voltages with simple calculation 1875 * 1876 * @rdev: Regulator device 1877 * @selector: Selector to convert into a voltage 1878 * 1879 * Regulators with a simple linear mapping between voltages and 1880 * selectors can set min_uV and uV_step in the regulator descriptor 1881 * and then use this function as their list_voltage() operation, 1882 */ 1883int regulator_list_voltage_linear(struct regulator_dev *rdev, 1884 unsigned int selector) 1885{ 1886 if (selector >= rdev->desc->n_voltages) 1887 return -EINVAL; 1888 1889 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1890} 1891EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1892 1893/** 1894 * regulator_list_voltage_table - List voltages with table based mapping 1895 * 1896 * @rdev: Regulator device 1897 * @selector: Selector to convert into a voltage 1898 * 1899 * Regulators with table based mapping between voltages and 1900 * selectors can set volt_table in the regulator descriptor 1901 * and then use this function as their list_voltage() operation. 1902 */ 1903int regulator_list_voltage_table(struct regulator_dev *rdev, 1904 unsigned int selector) 1905{ 1906 if (!rdev->desc->volt_table) { 1907 BUG_ON(!rdev->desc->volt_table); 1908 return -EINVAL; 1909 } 1910 1911 if (selector >= rdev->desc->n_voltages) 1912 return -EINVAL; 1913 1914 return rdev->desc->volt_table[selector]; 1915} 1916EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1917 1918/** 1919 * regulator_list_voltage - enumerate supported voltages 1920 * @regulator: regulator source 1921 * @selector: identify voltage to list 1922 * Context: can sleep 1923 * 1924 * Returns a voltage that can be passed to @regulator_set_voltage(), 1925 * zero if this selector code can't be used on this system, or a 1926 * negative errno. 1927 */ 1928int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1929{ 1930 struct regulator_dev *rdev = regulator->rdev; 1931 struct regulator_ops *ops = rdev->desc->ops; 1932 int ret; 1933 1934 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1935 return -EINVAL; 1936 1937 mutex_lock(&rdev->mutex); 1938 ret = ops->list_voltage(rdev, selector); 1939 mutex_unlock(&rdev->mutex); 1940 1941 if (ret > 0) { 1942 if (ret < rdev->constraints->min_uV) 1943 ret = 0; 1944 else if (ret > rdev->constraints->max_uV) 1945 ret = 0; 1946 } 1947 1948 return ret; 1949} 1950EXPORT_SYMBOL_GPL(regulator_list_voltage); 1951 1952/** 1953 * regulator_is_supported_voltage - check if a voltage range can be supported 1954 * 1955 * @regulator: Regulator to check. 1956 * @min_uV: Minimum required voltage in uV. 1957 * @max_uV: Maximum required voltage in uV. 1958 * 1959 * Returns a boolean or a negative error code. 1960 */ 1961int regulator_is_supported_voltage(struct regulator *regulator, 1962 int min_uV, int max_uV) 1963{ 1964 int i, voltages, ret; 1965 1966 ret = regulator_count_voltages(regulator); 1967 if (ret < 0) 1968 return ret; 1969 voltages = ret; 1970 1971 for (i = 0; i < voltages; i++) { 1972 ret = regulator_list_voltage(regulator, i); 1973 1974 if (ret >= min_uV && ret <= max_uV) 1975 return 1; 1976 } 1977 1978 return 0; 1979} 1980EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1981 1982/** 1983 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1984 * 1985 * @rdev: regulator to operate on 1986 * 1987 * Regulators that use regmap for their register I/O can set the 1988 * vsel_reg and vsel_mask fields in their descriptor and then use this 1989 * as their get_voltage_vsel operation, saving some code. 1990 */ 1991int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1992{ 1993 unsigned int val; 1994 int ret; 1995 1996 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1997 if (ret != 0) 1998 return ret; 1999 2000 val &= rdev->desc->vsel_mask; 2001 val >>= ffs(rdev->desc->vsel_mask) - 1; 2002 2003 return val; 2004} 2005EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2006 2007/** 2008 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2009 * 2010 * @rdev: regulator to operate on 2011 * @sel: Selector to set 2012 * 2013 * Regulators that use regmap for their register I/O can set the 2014 * vsel_reg and vsel_mask fields in their descriptor and then use this 2015 * as their set_voltage_vsel operation, saving some code. 2016 */ 2017int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2018{ 2019 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2020 2021 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2022 rdev->desc->vsel_mask, sel); 2023} 2024EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2025 2026/** 2027 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2028 * 2029 * @rdev: Regulator to operate on 2030 * @min_uV: Lower bound for voltage 2031 * @max_uV: Upper bound for voltage 2032 * 2033 * Drivers implementing set_voltage_sel() and list_voltage() can use 2034 * this as their map_voltage() operation. It will find a suitable 2035 * voltage by calling list_voltage() until it gets something in bounds 2036 * for the requested voltages. 2037 */ 2038int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2039 int min_uV, int max_uV) 2040{ 2041 int best_val = INT_MAX; 2042 int selector = 0; 2043 int i, ret; 2044 2045 /* Find the smallest voltage that falls within the specified 2046 * range. 2047 */ 2048 for (i = 0; i < rdev->desc->n_voltages; i++) { 2049 ret = rdev->desc->ops->list_voltage(rdev, i); 2050 if (ret < 0) 2051 continue; 2052 2053 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2054 best_val = ret; 2055 selector = i; 2056 } 2057 } 2058 2059 if (best_val != INT_MAX) 2060 return selector; 2061 else 2062 return -EINVAL; 2063} 2064EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2065 2066/** 2067 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2068 * 2069 * @rdev: Regulator to operate on 2070 * @min_uV: Lower bound for voltage 2071 * @max_uV: Upper bound for voltage 2072 * 2073 * Drivers providing min_uV and uV_step in their regulator_desc can 2074 * use this as their map_voltage() operation. 2075 */ 2076int regulator_map_voltage_linear(struct regulator_dev *rdev, 2077 int min_uV, int max_uV) 2078{ 2079 int ret, voltage; 2080 2081 /* Allow uV_step to be 0 for fixed voltage */ 2082 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2083 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2084 return 0; 2085 else 2086 return -EINVAL; 2087 } 2088 2089 if (!rdev->desc->uV_step) { 2090 BUG_ON(!rdev->desc->uV_step); 2091 return -EINVAL; 2092 } 2093 2094 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2095 if (ret < 0) 2096 return ret; 2097 2098 /* Map back into a voltage to verify we're still in bounds */ 2099 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2100 if (voltage < min_uV || voltage > max_uV) 2101 return -EINVAL; 2102 2103 return ret; 2104} 2105EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2106 2107static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2108 int min_uV, int max_uV) 2109{ 2110 int ret; 2111 int delay = 0; 2112 int best_val; 2113 unsigned int selector; 2114 int old_selector = -1; 2115 2116 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2117 2118 min_uV += rdev->constraints->uV_offset; 2119 max_uV += rdev->constraints->uV_offset; 2120 2121 /* 2122 * If we can't obtain the old selector there is not enough 2123 * info to call set_voltage_time_sel(). 2124 */ 2125 if (_regulator_is_enabled(rdev) && 2126 rdev->desc->ops->set_voltage_time_sel && 2127 rdev->desc->ops->get_voltage_sel) { 2128 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2129 if (old_selector < 0) 2130 return old_selector; 2131 } 2132 2133 if (rdev->desc->ops->set_voltage) { 2134 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2135 &selector); 2136 } else if (rdev->desc->ops->set_voltage_sel) { 2137 if (rdev->desc->ops->map_voltage) 2138 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2139 max_uV); 2140 else 2141 ret = regulator_map_voltage_iterate(rdev, min_uV, 2142 max_uV); 2143 2144 if (ret >= 0) { 2145 selector = ret; 2146 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2147 } 2148 } else { 2149 ret = -EINVAL; 2150 } 2151 2152 if (rdev->desc->ops->list_voltage) 2153 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2154 else 2155 best_val = -1; 2156 2157 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2158 if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 && 2159 rdev->desc->ops->set_voltage_time_sel) { 2160 2161 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2162 old_selector, selector); 2163 if (delay < 0) { 2164 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2165 delay); 2166 delay = 0; 2167 } 2168 } 2169 2170 /* Insert any necessary delays */ 2171 if (delay >= 1000) { 2172 mdelay(delay / 1000); 2173 udelay(delay % 1000); 2174 } else if (delay) { 2175 udelay(delay); 2176 } 2177 2178 if (ret == 0) 2179 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2180 NULL); 2181 2182 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2183 2184 return ret; 2185} 2186 2187/** 2188 * regulator_set_voltage - set regulator output voltage 2189 * @regulator: regulator source 2190 * @min_uV: Minimum required voltage in uV 2191 * @max_uV: Maximum acceptable voltage in uV 2192 * 2193 * Sets a voltage regulator to the desired output voltage. This can be set 2194 * during any regulator state. IOW, regulator can be disabled or enabled. 2195 * 2196 * If the regulator is enabled then the voltage will change to the new value 2197 * immediately otherwise if the regulator is disabled the regulator will 2198 * output at the new voltage when enabled. 2199 * 2200 * NOTE: If the regulator is shared between several devices then the lowest 2201 * request voltage that meets the system constraints will be used. 2202 * Regulator system constraints must be set for this regulator before 2203 * calling this function otherwise this call will fail. 2204 */ 2205int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2206{ 2207 struct regulator_dev *rdev = regulator->rdev; 2208 int ret = 0; 2209 2210 mutex_lock(&rdev->mutex); 2211 2212 /* If we're setting the same range as last time the change 2213 * should be a noop (some cpufreq implementations use the same 2214 * voltage for multiple frequencies, for example). 2215 */ 2216 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2217 goto out; 2218 2219 /* sanity check */ 2220 if (!rdev->desc->ops->set_voltage && 2221 !rdev->desc->ops->set_voltage_sel) { 2222 ret = -EINVAL; 2223 goto out; 2224 } 2225 2226 /* constraints check */ 2227 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2228 if (ret < 0) 2229 goto out; 2230 regulator->min_uV = min_uV; 2231 regulator->max_uV = max_uV; 2232 2233 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2234 if (ret < 0) 2235 goto out; 2236 2237 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2238 2239out: 2240 mutex_unlock(&rdev->mutex); 2241 return ret; 2242} 2243EXPORT_SYMBOL_GPL(regulator_set_voltage); 2244 2245/** 2246 * regulator_set_voltage_time - get raise/fall time 2247 * @regulator: regulator source 2248 * @old_uV: starting voltage in microvolts 2249 * @new_uV: target voltage in microvolts 2250 * 2251 * Provided with the starting and ending voltage, this function attempts to 2252 * calculate the time in microseconds required to rise or fall to this new 2253 * voltage. 2254 */ 2255int regulator_set_voltage_time(struct regulator *regulator, 2256 int old_uV, int new_uV) 2257{ 2258 struct regulator_dev *rdev = regulator->rdev; 2259 struct regulator_ops *ops = rdev->desc->ops; 2260 int old_sel = -1; 2261 int new_sel = -1; 2262 int voltage; 2263 int i; 2264 2265 /* Currently requires operations to do this */ 2266 if (!ops->list_voltage || !ops->set_voltage_time_sel 2267 || !rdev->desc->n_voltages) 2268 return -EINVAL; 2269 2270 for (i = 0; i < rdev->desc->n_voltages; i++) { 2271 /* We only look for exact voltage matches here */ 2272 voltage = regulator_list_voltage(regulator, i); 2273 if (voltage < 0) 2274 return -EINVAL; 2275 if (voltage == 0) 2276 continue; 2277 if (voltage == old_uV) 2278 old_sel = i; 2279 if (voltage == new_uV) 2280 new_sel = i; 2281 } 2282 2283 if (old_sel < 0 || new_sel < 0) 2284 return -EINVAL; 2285 2286 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2287} 2288EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2289 2290/** 2291 *regulator_set_voltage_time_sel - get raise/fall time 2292 * @regulator: regulator source 2293 * @old_selector: selector for starting voltage 2294 * @new_selector: selector for target voltage 2295 * 2296 * Provided with the starting and target voltage selectors, this function 2297 * returns time in microseconds required to rise or fall to this new voltage 2298 * 2299 * Drivers providing uV_step or volt_table in their regulator_desc and 2300 * ramp_delay in regulation_constraints can use this as their 2301 * set_voltage_time_sel() operation. 2302 */ 2303int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2304 unsigned int old_selector, 2305 unsigned int new_selector) 2306{ 2307 unsigned int ramp_delay = 0; 2308 2309 if (rdev->constraints->ramp_delay) 2310 ramp_delay = rdev->constraints->ramp_delay; 2311 else if (rdev->desc->ramp_delay) 2312 ramp_delay = rdev->desc->ramp_delay; 2313 2314 if (ramp_delay == 0) { 2315 rdev_warn(rdev, "ramp_delay not set\n"); 2316 return 0; 2317 } 2318 2319 if (rdev->desc->uV_step) { 2320 return DIV_ROUND_UP(rdev->desc->uV_step * 2321 abs(new_selector - old_selector), 2322 ramp_delay * 1000); 2323 } else if (rdev->desc->volt_table) { 2324 return DIV_ROUND_UP(abs(rdev->desc->volt_table[new_selector] - 2325 rdev->desc->volt_table[old_selector]), 2326 ramp_delay * 1000); 2327 } else { 2328 rdev_warn(rdev, "Unsupported voltage mapping settings\n"); 2329 } 2330 2331 return 0; 2332} 2333 2334/** 2335 * regulator_sync_voltage - re-apply last regulator output voltage 2336 * @regulator: regulator source 2337 * 2338 * Re-apply the last configured voltage. This is intended to be used 2339 * where some external control source the consumer is cooperating with 2340 * has caused the configured voltage to change. 2341 */ 2342int regulator_sync_voltage(struct regulator *regulator) 2343{ 2344 struct regulator_dev *rdev = regulator->rdev; 2345 int ret, min_uV, max_uV; 2346 2347 mutex_lock(&rdev->mutex); 2348 2349 if (!rdev->desc->ops->set_voltage && 2350 !rdev->desc->ops->set_voltage_sel) { 2351 ret = -EINVAL; 2352 goto out; 2353 } 2354 2355 /* This is only going to work if we've had a voltage configured. */ 2356 if (!regulator->min_uV && !regulator->max_uV) { 2357 ret = -EINVAL; 2358 goto out; 2359 } 2360 2361 min_uV = regulator->min_uV; 2362 max_uV = regulator->max_uV; 2363 2364 /* This should be a paranoia check... */ 2365 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2366 if (ret < 0) 2367 goto out; 2368 2369 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2370 if (ret < 0) 2371 goto out; 2372 2373 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2374 2375out: 2376 mutex_unlock(&rdev->mutex); 2377 return ret; 2378} 2379EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2380 2381static int _regulator_get_voltage(struct regulator_dev *rdev) 2382{ 2383 int sel, ret; 2384 2385 if (rdev->desc->ops->get_voltage_sel) { 2386 sel = rdev->desc->ops->get_voltage_sel(rdev); 2387 if (sel < 0) 2388 return sel; 2389 ret = rdev->desc->ops->list_voltage(rdev, sel); 2390 } else if (rdev->desc->ops->get_voltage) { 2391 ret = rdev->desc->ops->get_voltage(rdev); 2392 } else { 2393 return -EINVAL; 2394 } 2395 2396 if (ret < 0) 2397 return ret; 2398 return ret - rdev->constraints->uV_offset; 2399} 2400 2401/** 2402 * regulator_get_voltage - get regulator output voltage 2403 * @regulator: regulator source 2404 * 2405 * This returns the current regulator voltage in uV. 2406 * 2407 * NOTE: If the regulator is disabled it will return the voltage value. This 2408 * function should not be used to determine regulator state. 2409 */ 2410int regulator_get_voltage(struct regulator *regulator) 2411{ 2412 int ret; 2413 2414 mutex_lock(®ulator->rdev->mutex); 2415 2416 ret = _regulator_get_voltage(regulator->rdev); 2417 2418 mutex_unlock(®ulator->rdev->mutex); 2419 2420 return ret; 2421} 2422EXPORT_SYMBOL_GPL(regulator_get_voltage); 2423 2424/** 2425 * regulator_set_current_limit - set regulator output current limit 2426 * @regulator: regulator source 2427 * @min_uA: Minimuum supported current in uA 2428 * @max_uA: Maximum supported current in uA 2429 * 2430 * Sets current sink to the desired output current. This can be set during 2431 * any regulator state. IOW, regulator can be disabled or enabled. 2432 * 2433 * If the regulator is enabled then the current will change to the new value 2434 * immediately otherwise if the regulator is disabled the regulator will 2435 * output at the new current when enabled. 2436 * 2437 * NOTE: Regulator system constraints must be set for this regulator before 2438 * calling this function otherwise this call will fail. 2439 */ 2440int regulator_set_current_limit(struct regulator *regulator, 2441 int min_uA, int max_uA) 2442{ 2443 struct regulator_dev *rdev = regulator->rdev; 2444 int ret; 2445 2446 mutex_lock(&rdev->mutex); 2447 2448 /* sanity check */ 2449 if (!rdev->desc->ops->set_current_limit) { 2450 ret = -EINVAL; 2451 goto out; 2452 } 2453 2454 /* constraints check */ 2455 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2456 if (ret < 0) 2457 goto out; 2458 2459 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2460out: 2461 mutex_unlock(&rdev->mutex); 2462 return ret; 2463} 2464EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2465 2466static int _regulator_get_current_limit(struct regulator_dev *rdev) 2467{ 2468 int ret; 2469 2470 mutex_lock(&rdev->mutex); 2471 2472 /* sanity check */ 2473 if (!rdev->desc->ops->get_current_limit) { 2474 ret = -EINVAL; 2475 goto out; 2476 } 2477 2478 ret = rdev->desc->ops->get_current_limit(rdev); 2479out: 2480 mutex_unlock(&rdev->mutex); 2481 return ret; 2482} 2483 2484/** 2485 * regulator_get_current_limit - get regulator output current 2486 * @regulator: regulator source 2487 * 2488 * This returns the current supplied by the specified current sink in uA. 2489 * 2490 * NOTE: If the regulator is disabled it will return the current value. This 2491 * function should not be used to determine regulator state. 2492 */ 2493int regulator_get_current_limit(struct regulator *regulator) 2494{ 2495 return _regulator_get_current_limit(regulator->rdev); 2496} 2497EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2498 2499/** 2500 * regulator_set_mode - set regulator operating mode 2501 * @regulator: regulator source 2502 * @mode: operating mode - one of the REGULATOR_MODE constants 2503 * 2504 * Set regulator operating mode to increase regulator efficiency or improve 2505 * regulation performance. 2506 * 2507 * NOTE: Regulator system constraints must be set for this regulator before 2508 * calling this function otherwise this call will fail. 2509 */ 2510int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2511{ 2512 struct regulator_dev *rdev = regulator->rdev; 2513 int ret; 2514 int regulator_curr_mode; 2515 2516 mutex_lock(&rdev->mutex); 2517 2518 /* sanity check */ 2519 if (!rdev->desc->ops->set_mode) { 2520 ret = -EINVAL; 2521 goto out; 2522 } 2523 2524 /* return if the same mode is requested */ 2525 if (rdev->desc->ops->get_mode) { 2526 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2527 if (regulator_curr_mode == mode) { 2528 ret = 0; 2529 goto out; 2530 } 2531 } 2532 2533 /* constraints check */ 2534 ret = regulator_mode_constrain(rdev, &mode); 2535 if (ret < 0) 2536 goto out; 2537 2538 ret = rdev->desc->ops->set_mode(rdev, mode); 2539out: 2540 mutex_unlock(&rdev->mutex); 2541 return ret; 2542} 2543EXPORT_SYMBOL_GPL(regulator_set_mode); 2544 2545static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2546{ 2547 int ret; 2548 2549 mutex_lock(&rdev->mutex); 2550 2551 /* sanity check */ 2552 if (!rdev->desc->ops->get_mode) { 2553 ret = -EINVAL; 2554 goto out; 2555 } 2556 2557 ret = rdev->desc->ops->get_mode(rdev); 2558out: 2559 mutex_unlock(&rdev->mutex); 2560 return ret; 2561} 2562 2563/** 2564 * regulator_get_mode - get regulator operating mode 2565 * @regulator: regulator source 2566 * 2567 * Get the current regulator operating mode. 2568 */ 2569unsigned int regulator_get_mode(struct regulator *regulator) 2570{ 2571 return _regulator_get_mode(regulator->rdev); 2572} 2573EXPORT_SYMBOL_GPL(regulator_get_mode); 2574 2575/** 2576 * regulator_set_optimum_mode - set regulator optimum operating mode 2577 * @regulator: regulator source 2578 * @uA_load: load current 2579 * 2580 * Notifies the regulator core of a new device load. This is then used by 2581 * DRMS (if enabled by constraints) to set the most efficient regulator 2582 * operating mode for the new regulator loading. 2583 * 2584 * Consumer devices notify their supply regulator of the maximum power 2585 * they will require (can be taken from device datasheet in the power 2586 * consumption tables) when they change operational status and hence power 2587 * state. Examples of operational state changes that can affect power 2588 * consumption are :- 2589 * 2590 * o Device is opened / closed. 2591 * o Device I/O is about to begin or has just finished. 2592 * o Device is idling in between work. 2593 * 2594 * This information is also exported via sysfs to userspace. 2595 * 2596 * DRMS will sum the total requested load on the regulator and change 2597 * to the most efficient operating mode if platform constraints allow. 2598 * 2599 * Returns the new regulator mode or error. 2600 */ 2601int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2602{ 2603 struct regulator_dev *rdev = regulator->rdev; 2604 struct regulator *consumer; 2605 int ret, output_uV, input_uV, total_uA_load = 0; 2606 unsigned int mode; 2607 2608 mutex_lock(&rdev->mutex); 2609 2610 /* 2611 * first check to see if we can set modes at all, otherwise just 2612 * tell the consumer everything is OK. 2613 */ 2614 regulator->uA_load = uA_load; 2615 ret = regulator_check_drms(rdev); 2616 if (ret < 0) { 2617 ret = 0; 2618 goto out; 2619 } 2620 2621 if (!rdev->desc->ops->get_optimum_mode) 2622 goto out; 2623 2624 /* 2625 * we can actually do this so any errors are indicators of 2626 * potential real failure. 2627 */ 2628 ret = -EINVAL; 2629 2630 if (!rdev->desc->ops->set_mode) 2631 goto out; 2632 2633 /* get output voltage */ 2634 output_uV = _regulator_get_voltage(rdev); 2635 if (output_uV <= 0) { 2636 rdev_err(rdev, "invalid output voltage found\n"); 2637 goto out; 2638 } 2639 2640 /* get input voltage */ 2641 input_uV = 0; 2642 if (rdev->supply) 2643 input_uV = regulator_get_voltage(rdev->supply); 2644 if (input_uV <= 0) 2645 input_uV = rdev->constraints->input_uV; 2646 if (input_uV <= 0) { 2647 rdev_err(rdev, "invalid input voltage found\n"); 2648 goto out; 2649 } 2650 2651 /* calc total requested load for this regulator */ 2652 list_for_each_entry(consumer, &rdev->consumer_list, list) 2653 total_uA_load += consumer->uA_load; 2654 2655 mode = rdev->desc->ops->get_optimum_mode(rdev, 2656 input_uV, output_uV, 2657 total_uA_load); 2658 ret = regulator_mode_constrain(rdev, &mode); 2659 if (ret < 0) { 2660 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2661 total_uA_load, input_uV, output_uV); 2662 goto out; 2663 } 2664 2665 ret = rdev->desc->ops->set_mode(rdev, mode); 2666 if (ret < 0) { 2667 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2668 goto out; 2669 } 2670 ret = mode; 2671out: 2672 mutex_unlock(&rdev->mutex); 2673 return ret; 2674} 2675EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2676 2677/** 2678 * regulator_register_notifier - register regulator event notifier 2679 * @regulator: regulator source 2680 * @nb: notifier block 2681 * 2682 * Register notifier block to receive regulator events. 2683 */ 2684int regulator_register_notifier(struct regulator *regulator, 2685 struct notifier_block *nb) 2686{ 2687 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2688 nb); 2689} 2690EXPORT_SYMBOL_GPL(regulator_register_notifier); 2691 2692/** 2693 * regulator_unregister_notifier - unregister regulator event notifier 2694 * @regulator: regulator source 2695 * @nb: notifier block 2696 * 2697 * Unregister regulator event notifier block. 2698 */ 2699int regulator_unregister_notifier(struct regulator *regulator, 2700 struct notifier_block *nb) 2701{ 2702 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2703 nb); 2704} 2705EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2706 2707/* notify regulator consumers and downstream regulator consumers. 2708 * Note mutex must be held by caller. 2709 */ 2710static void _notifier_call_chain(struct regulator_dev *rdev, 2711 unsigned long event, void *data) 2712{ 2713 /* call rdev chain first */ 2714 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2715} 2716 2717/** 2718 * regulator_bulk_get - get multiple regulator consumers 2719 * 2720 * @dev: Device to supply 2721 * @num_consumers: Number of consumers to register 2722 * @consumers: Configuration of consumers; clients are stored here. 2723 * 2724 * @return 0 on success, an errno on failure. 2725 * 2726 * This helper function allows drivers to get several regulator 2727 * consumers in one operation. If any of the regulators cannot be 2728 * acquired then any regulators that were allocated will be freed 2729 * before returning to the caller. 2730 */ 2731int regulator_bulk_get(struct device *dev, int num_consumers, 2732 struct regulator_bulk_data *consumers) 2733{ 2734 int i; 2735 int ret; 2736 2737 for (i = 0; i < num_consumers; i++) 2738 consumers[i].consumer = NULL; 2739 2740 for (i = 0; i < num_consumers; i++) { 2741 consumers[i].consumer = regulator_get(dev, 2742 consumers[i].supply); 2743 if (IS_ERR(consumers[i].consumer)) { 2744 ret = PTR_ERR(consumers[i].consumer); 2745 dev_err(dev, "Failed to get supply '%s': %d\n", 2746 consumers[i].supply, ret); 2747 consumers[i].consumer = NULL; 2748 goto err; 2749 } 2750 } 2751 2752 return 0; 2753 2754err: 2755 while (--i >= 0) 2756 regulator_put(consumers[i].consumer); 2757 2758 return ret; 2759} 2760EXPORT_SYMBOL_GPL(regulator_bulk_get); 2761 2762/** 2763 * devm_regulator_bulk_get - managed get multiple regulator consumers 2764 * 2765 * @dev: Device to supply 2766 * @num_consumers: Number of consumers to register 2767 * @consumers: Configuration of consumers; clients are stored here. 2768 * 2769 * @return 0 on success, an errno on failure. 2770 * 2771 * This helper function allows drivers to get several regulator 2772 * consumers in one operation with management, the regulators will 2773 * automatically be freed when the device is unbound. If any of the 2774 * regulators cannot be acquired then any regulators that were 2775 * allocated will be freed before returning to the caller. 2776 */ 2777int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2778 struct regulator_bulk_data *consumers) 2779{ 2780 int i; 2781 int ret; 2782 2783 for (i = 0; i < num_consumers; i++) 2784 consumers[i].consumer = NULL; 2785 2786 for (i = 0; i < num_consumers; i++) { 2787 consumers[i].consumer = devm_regulator_get(dev, 2788 consumers[i].supply); 2789 if (IS_ERR(consumers[i].consumer)) { 2790 ret = PTR_ERR(consumers[i].consumer); 2791 dev_err(dev, "Failed to get supply '%s': %d\n", 2792 consumers[i].supply, ret); 2793 consumers[i].consumer = NULL; 2794 goto err; 2795 } 2796 } 2797 2798 return 0; 2799 2800err: 2801 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2802 devm_regulator_put(consumers[i].consumer); 2803 2804 return ret; 2805} 2806EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2807 2808static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2809{ 2810 struct regulator_bulk_data *bulk = data; 2811 2812 bulk->ret = regulator_enable(bulk->consumer); 2813} 2814 2815/** 2816 * regulator_bulk_enable - enable multiple regulator consumers 2817 * 2818 * @num_consumers: Number of consumers 2819 * @consumers: Consumer data; clients are stored here. 2820 * @return 0 on success, an errno on failure 2821 * 2822 * This convenience API allows consumers to enable multiple regulator 2823 * clients in a single API call. If any consumers cannot be enabled 2824 * then any others that were enabled will be disabled again prior to 2825 * return. 2826 */ 2827int regulator_bulk_enable(int num_consumers, 2828 struct regulator_bulk_data *consumers) 2829{ 2830 LIST_HEAD(async_domain); 2831 int i; 2832 int ret = 0; 2833 2834 for (i = 0; i < num_consumers; i++) { 2835 if (consumers[i].consumer->always_on) 2836 consumers[i].ret = 0; 2837 else 2838 async_schedule_domain(regulator_bulk_enable_async, 2839 &consumers[i], &async_domain); 2840 } 2841 2842 async_synchronize_full_domain(&async_domain); 2843 2844 /* If any consumer failed we need to unwind any that succeeded */ 2845 for (i = 0; i < num_consumers; i++) { 2846 if (consumers[i].ret != 0) { 2847 ret = consumers[i].ret; 2848 goto err; 2849 } 2850 } 2851 2852 return 0; 2853 2854err: 2855 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2856 while (--i >= 0) 2857 regulator_disable(consumers[i].consumer); 2858 2859 return ret; 2860} 2861EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2862 2863/** 2864 * regulator_bulk_disable - disable multiple regulator consumers 2865 * 2866 * @num_consumers: Number of consumers 2867 * @consumers: Consumer data; clients are stored here. 2868 * @return 0 on success, an errno on failure 2869 * 2870 * This convenience API allows consumers to disable multiple regulator 2871 * clients in a single API call. If any consumers cannot be disabled 2872 * then any others that were disabled will be enabled again prior to 2873 * return. 2874 */ 2875int regulator_bulk_disable(int num_consumers, 2876 struct regulator_bulk_data *consumers) 2877{ 2878 int i; 2879 int ret, r; 2880 2881 for (i = num_consumers - 1; i >= 0; --i) { 2882 ret = regulator_disable(consumers[i].consumer); 2883 if (ret != 0) 2884 goto err; 2885 } 2886 2887 return 0; 2888 2889err: 2890 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2891 for (++i; i < num_consumers; ++i) { 2892 r = regulator_enable(consumers[i].consumer); 2893 if (r != 0) 2894 pr_err("Failed to reename %s: %d\n", 2895 consumers[i].supply, r); 2896 } 2897 2898 return ret; 2899} 2900EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2901 2902/** 2903 * regulator_bulk_force_disable - force disable multiple regulator consumers 2904 * 2905 * @num_consumers: Number of consumers 2906 * @consumers: Consumer data; clients are stored here. 2907 * @return 0 on success, an errno on failure 2908 * 2909 * This convenience API allows consumers to forcibly disable multiple regulator 2910 * clients in a single API call. 2911 * NOTE: This should be used for situations when device damage will 2912 * likely occur if the regulators are not disabled (e.g. over temp). 2913 * Although regulator_force_disable function call for some consumers can 2914 * return error numbers, the function is called for all consumers. 2915 */ 2916int regulator_bulk_force_disable(int num_consumers, 2917 struct regulator_bulk_data *consumers) 2918{ 2919 int i; 2920 int ret; 2921 2922 for (i = 0; i < num_consumers; i++) 2923 consumers[i].ret = 2924 regulator_force_disable(consumers[i].consumer); 2925 2926 for (i = 0; i < num_consumers; i++) { 2927 if (consumers[i].ret != 0) { 2928 ret = consumers[i].ret; 2929 goto out; 2930 } 2931 } 2932 2933 return 0; 2934out: 2935 return ret; 2936} 2937EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2938 2939/** 2940 * regulator_bulk_free - free multiple regulator consumers 2941 * 2942 * @num_consumers: Number of consumers 2943 * @consumers: Consumer data; clients are stored here. 2944 * 2945 * This convenience API allows consumers to free multiple regulator 2946 * clients in a single API call. 2947 */ 2948void regulator_bulk_free(int num_consumers, 2949 struct regulator_bulk_data *consumers) 2950{ 2951 int i; 2952 2953 for (i = 0; i < num_consumers; i++) { 2954 regulator_put(consumers[i].consumer); 2955 consumers[i].consumer = NULL; 2956 } 2957} 2958EXPORT_SYMBOL_GPL(regulator_bulk_free); 2959 2960/** 2961 * regulator_notifier_call_chain - call regulator event notifier 2962 * @rdev: regulator source 2963 * @event: notifier block 2964 * @data: callback-specific data. 2965 * 2966 * Called by regulator drivers to notify clients a regulator event has 2967 * occurred. We also notify regulator clients downstream. 2968 * Note lock must be held by caller. 2969 */ 2970int regulator_notifier_call_chain(struct regulator_dev *rdev, 2971 unsigned long event, void *data) 2972{ 2973 _notifier_call_chain(rdev, event, data); 2974 return NOTIFY_DONE; 2975 2976} 2977EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2978 2979/** 2980 * regulator_mode_to_status - convert a regulator mode into a status 2981 * 2982 * @mode: Mode to convert 2983 * 2984 * Convert a regulator mode into a status. 2985 */ 2986int regulator_mode_to_status(unsigned int mode) 2987{ 2988 switch (mode) { 2989 case REGULATOR_MODE_FAST: 2990 return REGULATOR_STATUS_FAST; 2991 case REGULATOR_MODE_NORMAL: 2992 return REGULATOR_STATUS_NORMAL; 2993 case REGULATOR_MODE_IDLE: 2994 return REGULATOR_STATUS_IDLE; 2995 case REGULATOR_STATUS_STANDBY: 2996 return REGULATOR_STATUS_STANDBY; 2997 default: 2998 return 0; 2999 } 3000} 3001EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3002 3003/* 3004 * To avoid cluttering sysfs (and memory) with useless state, only 3005 * create attributes that can be meaningfully displayed. 3006 */ 3007static int add_regulator_attributes(struct regulator_dev *rdev) 3008{ 3009 struct device *dev = &rdev->dev; 3010 struct regulator_ops *ops = rdev->desc->ops; 3011 int status = 0; 3012 3013 /* some attributes need specific methods to be displayed */ 3014 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3015 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 3016 status = device_create_file(dev, &dev_attr_microvolts); 3017 if (status < 0) 3018 return status; 3019 } 3020 if (ops->get_current_limit) { 3021 status = device_create_file(dev, &dev_attr_microamps); 3022 if (status < 0) 3023 return status; 3024 } 3025 if (ops->get_mode) { 3026 status = device_create_file(dev, &dev_attr_opmode); 3027 if (status < 0) 3028 return status; 3029 } 3030 if (ops->is_enabled) { 3031 status = device_create_file(dev, &dev_attr_state); 3032 if (status < 0) 3033 return status; 3034 } 3035 if (ops->get_status) { 3036 status = device_create_file(dev, &dev_attr_status); 3037 if (status < 0) 3038 return status; 3039 } 3040 3041 /* some attributes are type-specific */ 3042 if (rdev->desc->type == REGULATOR_CURRENT) { 3043 status = device_create_file(dev, &dev_attr_requested_microamps); 3044 if (status < 0) 3045 return status; 3046 } 3047 3048 /* all the other attributes exist to support constraints; 3049 * don't show them if there are no constraints, or if the 3050 * relevant supporting methods are missing. 3051 */ 3052 if (!rdev->constraints) 3053 return status; 3054 3055 /* constraints need specific supporting methods */ 3056 if (ops->set_voltage || ops->set_voltage_sel) { 3057 status = device_create_file(dev, &dev_attr_min_microvolts); 3058 if (status < 0) 3059 return status; 3060 status = device_create_file(dev, &dev_attr_max_microvolts); 3061 if (status < 0) 3062 return status; 3063 } 3064 if (ops->set_current_limit) { 3065 status = device_create_file(dev, &dev_attr_min_microamps); 3066 if (status < 0) 3067 return status; 3068 status = device_create_file(dev, &dev_attr_max_microamps); 3069 if (status < 0) 3070 return status; 3071 } 3072 3073 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3074 if (status < 0) 3075 return status; 3076 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3077 if (status < 0) 3078 return status; 3079 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3080 if (status < 0) 3081 return status; 3082 3083 if (ops->set_suspend_voltage) { 3084 status = device_create_file(dev, 3085 &dev_attr_suspend_standby_microvolts); 3086 if (status < 0) 3087 return status; 3088 status = device_create_file(dev, 3089 &dev_attr_suspend_mem_microvolts); 3090 if (status < 0) 3091 return status; 3092 status = device_create_file(dev, 3093 &dev_attr_suspend_disk_microvolts); 3094 if (status < 0) 3095 return status; 3096 } 3097 3098 if (ops->set_suspend_mode) { 3099 status = device_create_file(dev, 3100 &dev_attr_suspend_standby_mode); 3101 if (status < 0) 3102 return status; 3103 status = device_create_file(dev, 3104 &dev_attr_suspend_mem_mode); 3105 if (status < 0) 3106 return status; 3107 status = device_create_file(dev, 3108 &dev_attr_suspend_disk_mode); 3109 if (status < 0) 3110 return status; 3111 } 3112 3113 return status; 3114} 3115 3116static void rdev_init_debugfs(struct regulator_dev *rdev) 3117{ 3118 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3119 if (!rdev->debugfs) { 3120 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3121 return; 3122 } 3123 3124 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3125 &rdev->use_count); 3126 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3127 &rdev->open_count); 3128} 3129 3130/** 3131 * regulator_register - register regulator 3132 * @regulator_desc: regulator to register 3133 * @config: runtime configuration for regulator 3134 * 3135 * Called by regulator drivers to register a regulator. 3136 * Returns 0 on success. 3137 */ 3138struct regulator_dev * 3139regulator_register(const struct regulator_desc *regulator_desc, 3140 const struct regulator_config *config) 3141{ 3142 const struct regulation_constraints *constraints = NULL; 3143 const struct regulator_init_data *init_data; 3144 static atomic_t regulator_no = ATOMIC_INIT(0); 3145 struct regulator_dev *rdev; 3146 struct device *dev; 3147 int ret, i; 3148 const char *supply = NULL; 3149 3150 if (regulator_desc == NULL || config == NULL) 3151 return ERR_PTR(-EINVAL); 3152 3153 dev = config->dev; 3154 WARN_ON(!dev); 3155 3156 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3157 return ERR_PTR(-EINVAL); 3158 3159 if (regulator_desc->type != REGULATOR_VOLTAGE && 3160 regulator_desc->type != REGULATOR_CURRENT) 3161 return ERR_PTR(-EINVAL); 3162 3163 /* Only one of each should be implemented */ 3164 WARN_ON(regulator_desc->ops->get_voltage && 3165 regulator_desc->ops->get_voltage_sel); 3166 WARN_ON(regulator_desc->ops->set_voltage && 3167 regulator_desc->ops->set_voltage_sel); 3168 3169 /* If we're using selectors we must implement list_voltage. */ 3170 if (regulator_desc->ops->get_voltage_sel && 3171 !regulator_desc->ops->list_voltage) { 3172 return ERR_PTR(-EINVAL); 3173 } 3174 if (regulator_desc->ops->set_voltage_sel && 3175 !regulator_desc->ops->list_voltage) { 3176 return ERR_PTR(-EINVAL); 3177 } 3178 3179 init_data = config->init_data; 3180 3181 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3182 if (rdev == NULL) 3183 return ERR_PTR(-ENOMEM); 3184 3185 mutex_lock(®ulator_list_mutex); 3186 3187 mutex_init(&rdev->mutex); 3188 rdev->reg_data = config->driver_data; 3189 rdev->owner = regulator_desc->owner; 3190 rdev->desc = regulator_desc; 3191 if (config->regmap) 3192 rdev->regmap = config->regmap; 3193 else 3194 rdev->regmap = dev_get_regmap(dev, NULL); 3195 INIT_LIST_HEAD(&rdev->consumer_list); 3196 INIT_LIST_HEAD(&rdev->list); 3197 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3198 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3199 3200 /* preform any regulator specific init */ 3201 if (init_data && init_data->regulator_init) { 3202 ret = init_data->regulator_init(rdev->reg_data); 3203 if (ret < 0) 3204 goto clean; 3205 } 3206 3207 /* register with sysfs */ 3208 rdev->dev.class = ®ulator_class; 3209 rdev->dev.of_node = config->of_node; 3210 rdev->dev.parent = dev; 3211 dev_set_name(&rdev->dev, "regulator.%d", 3212 atomic_inc_return(®ulator_no) - 1); 3213 ret = device_register(&rdev->dev); 3214 if (ret != 0) { 3215 put_device(&rdev->dev); 3216 goto clean; 3217 } 3218 3219 dev_set_drvdata(&rdev->dev, rdev); 3220 3221 /* set regulator constraints */ 3222 if (init_data) 3223 constraints = &init_data->constraints; 3224 3225 ret = set_machine_constraints(rdev, constraints); 3226 if (ret < 0) 3227 goto scrub; 3228 3229 /* add attributes supported by this regulator */ 3230 ret = add_regulator_attributes(rdev); 3231 if (ret < 0) 3232 goto scrub; 3233 3234 if (init_data && init_data->supply_regulator) 3235 supply = init_data->supply_regulator; 3236 else if (regulator_desc->supply_name) 3237 supply = regulator_desc->supply_name; 3238 3239 if (supply) { 3240 struct regulator_dev *r; 3241 3242 r = regulator_dev_lookup(dev, supply, &ret); 3243 3244 if (!r) { 3245 dev_err(dev, "Failed to find supply %s\n", supply); 3246 ret = -EPROBE_DEFER; 3247 goto scrub; 3248 } 3249 3250 ret = set_supply(rdev, r); 3251 if (ret < 0) 3252 goto scrub; 3253 3254 /* Enable supply if rail is enabled */ 3255 if (_regulator_is_enabled(rdev)) { 3256 ret = regulator_enable(rdev->supply); 3257 if (ret < 0) 3258 goto scrub; 3259 } 3260 } 3261 3262 /* add consumers devices */ 3263 if (init_data) { 3264 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3265 ret = set_consumer_device_supply(rdev, 3266 init_data->consumer_supplies[i].dev_name, 3267 init_data->consumer_supplies[i].supply); 3268 if (ret < 0) { 3269 dev_err(dev, "Failed to set supply %s\n", 3270 init_data->consumer_supplies[i].supply); 3271 goto unset_supplies; 3272 } 3273 } 3274 } 3275 3276 list_add(&rdev->list, ®ulator_list); 3277 3278 rdev_init_debugfs(rdev); 3279out: 3280 mutex_unlock(®ulator_list_mutex); 3281 return rdev; 3282 3283unset_supplies: 3284 unset_regulator_supplies(rdev); 3285 3286scrub: 3287 if (rdev->supply) 3288 regulator_put(rdev->supply); 3289 kfree(rdev->constraints); 3290 device_unregister(&rdev->dev); 3291 /* device core frees rdev */ 3292 rdev = ERR_PTR(ret); 3293 goto out; 3294 3295clean: 3296 kfree(rdev); 3297 rdev = ERR_PTR(ret); 3298 goto out; 3299} 3300EXPORT_SYMBOL_GPL(regulator_register); 3301 3302/** 3303 * regulator_unregister - unregister regulator 3304 * @rdev: regulator to unregister 3305 * 3306 * Called by regulator drivers to unregister a regulator. 3307 */ 3308void regulator_unregister(struct regulator_dev *rdev) 3309{ 3310 if (rdev == NULL) 3311 return; 3312 3313 if (rdev->supply) 3314 regulator_put(rdev->supply); 3315 mutex_lock(®ulator_list_mutex); 3316 debugfs_remove_recursive(rdev->debugfs); 3317 flush_work_sync(&rdev->disable_work.work); 3318 WARN_ON(rdev->open_count); 3319 unset_regulator_supplies(rdev); 3320 list_del(&rdev->list); 3321 kfree(rdev->constraints); 3322 device_unregister(&rdev->dev); 3323 mutex_unlock(®ulator_list_mutex); 3324} 3325EXPORT_SYMBOL_GPL(regulator_unregister); 3326 3327/** 3328 * regulator_suspend_prepare - prepare regulators for system wide suspend 3329 * @state: system suspend state 3330 * 3331 * Configure each regulator with it's suspend operating parameters for state. 3332 * This will usually be called by machine suspend code prior to supending. 3333 */ 3334int regulator_suspend_prepare(suspend_state_t state) 3335{ 3336 struct regulator_dev *rdev; 3337 int ret = 0; 3338 3339 /* ON is handled by regulator active state */ 3340 if (state == PM_SUSPEND_ON) 3341 return -EINVAL; 3342 3343 mutex_lock(®ulator_list_mutex); 3344 list_for_each_entry(rdev, ®ulator_list, list) { 3345 3346 mutex_lock(&rdev->mutex); 3347 ret = suspend_prepare(rdev, state); 3348 mutex_unlock(&rdev->mutex); 3349 3350 if (ret < 0) { 3351 rdev_err(rdev, "failed to prepare\n"); 3352 goto out; 3353 } 3354 } 3355out: 3356 mutex_unlock(®ulator_list_mutex); 3357 return ret; 3358} 3359EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3360 3361/** 3362 * regulator_suspend_finish - resume regulators from system wide suspend 3363 * 3364 * Turn on regulators that might be turned off by regulator_suspend_prepare 3365 * and that should be turned on according to the regulators properties. 3366 */ 3367int regulator_suspend_finish(void) 3368{ 3369 struct regulator_dev *rdev; 3370 int ret = 0, error; 3371 3372 mutex_lock(®ulator_list_mutex); 3373 list_for_each_entry(rdev, ®ulator_list, list) { 3374 struct regulator_ops *ops = rdev->desc->ops; 3375 3376 mutex_lock(&rdev->mutex); 3377 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3378 ops->enable) { 3379 error = ops->enable(rdev); 3380 if (error) 3381 ret = error; 3382 } else { 3383 if (!has_full_constraints) 3384 goto unlock; 3385 if (!ops->disable) 3386 goto unlock; 3387 if (!_regulator_is_enabled(rdev)) 3388 goto unlock; 3389 3390 error = ops->disable(rdev); 3391 if (error) 3392 ret = error; 3393 } 3394unlock: 3395 mutex_unlock(&rdev->mutex); 3396 } 3397 mutex_unlock(®ulator_list_mutex); 3398 return ret; 3399} 3400EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3401 3402/** 3403 * regulator_has_full_constraints - the system has fully specified constraints 3404 * 3405 * Calling this function will cause the regulator API to disable all 3406 * regulators which have a zero use count and don't have an always_on 3407 * constraint in a late_initcall. 3408 * 3409 * The intention is that this will become the default behaviour in a 3410 * future kernel release so users are encouraged to use this facility 3411 * now. 3412 */ 3413void regulator_has_full_constraints(void) 3414{ 3415 has_full_constraints = 1; 3416} 3417EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3418 3419/** 3420 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3421 * 3422 * Calling this function will cause the regulator API to provide a 3423 * dummy regulator to consumers if no physical regulator is found, 3424 * allowing most consumers to proceed as though a regulator were 3425 * configured. This allows systems such as those with software 3426 * controllable regulators for the CPU core only to be brought up more 3427 * readily. 3428 */ 3429void regulator_use_dummy_regulator(void) 3430{ 3431 board_wants_dummy_regulator = true; 3432} 3433EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3434 3435/** 3436 * rdev_get_drvdata - get rdev regulator driver data 3437 * @rdev: regulator 3438 * 3439 * Get rdev regulator driver private data. This call can be used in the 3440 * regulator driver context. 3441 */ 3442void *rdev_get_drvdata(struct regulator_dev *rdev) 3443{ 3444 return rdev->reg_data; 3445} 3446EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3447 3448/** 3449 * regulator_get_drvdata - get regulator driver data 3450 * @regulator: regulator 3451 * 3452 * Get regulator driver private data. This call can be used in the consumer 3453 * driver context when non API regulator specific functions need to be called. 3454 */ 3455void *regulator_get_drvdata(struct regulator *regulator) 3456{ 3457 return regulator->rdev->reg_data; 3458} 3459EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3460 3461/** 3462 * regulator_set_drvdata - set regulator driver data 3463 * @regulator: regulator 3464 * @data: data 3465 */ 3466void regulator_set_drvdata(struct regulator *regulator, void *data) 3467{ 3468 regulator->rdev->reg_data = data; 3469} 3470EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3471 3472/** 3473 * regulator_get_id - get regulator ID 3474 * @rdev: regulator 3475 */ 3476int rdev_get_id(struct regulator_dev *rdev) 3477{ 3478 return rdev->desc->id; 3479} 3480EXPORT_SYMBOL_GPL(rdev_get_id); 3481 3482struct device *rdev_get_dev(struct regulator_dev *rdev) 3483{ 3484 return &rdev->dev; 3485} 3486EXPORT_SYMBOL_GPL(rdev_get_dev); 3487 3488void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3489{ 3490 return reg_init_data->driver_data; 3491} 3492EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3493 3494#ifdef CONFIG_DEBUG_FS 3495static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3496 size_t count, loff_t *ppos) 3497{ 3498 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3499 ssize_t len, ret = 0; 3500 struct regulator_map *map; 3501 3502 if (!buf) 3503 return -ENOMEM; 3504 3505 list_for_each_entry(map, ®ulator_map_list, list) { 3506 len = snprintf(buf + ret, PAGE_SIZE - ret, 3507 "%s -> %s.%s\n", 3508 rdev_get_name(map->regulator), map->dev_name, 3509 map->supply); 3510 if (len >= 0) 3511 ret += len; 3512 if (ret > PAGE_SIZE) { 3513 ret = PAGE_SIZE; 3514 break; 3515 } 3516 } 3517 3518 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3519 3520 kfree(buf); 3521 3522 return ret; 3523} 3524#endif 3525 3526static const struct file_operations supply_map_fops = { 3527#ifdef CONFIG_DEBUG_FS 3528 .read = supply_map_read_file, 3529 .llseek = default_llseek, 3530#endif 3531}; 3532 3533static int __init regulator_init(void) 3534{ 3535 int ret; 3536 3537 ret = class_register(®ulator_class); 3538 3539 debugfs_root = debugfs_create_dir("regulator", NULL); 3540 if (!debugfs_root) 3541 pr_warn("regulator: Failed to create debugfs directory\n"); 3542 3543 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3544 &supply_map_fops); 3545 3546 regulator_dummy_init(); 3547 3548 return ret; 3549} 3550 3551/* init early to allow our consumers to complete system booting */ 3552core_initcall(regulator_init); 3553 3554static int __init regulator_init_complete(void) 3555{ 3556 struct regulator_dev *rdev; 3557 struct regulator_ops *ops; 3558 struct regulation_constraints *c; 3559 int enabled, ret; 3560 3561 mutex_lock(®ulator_list_mutex); 3562 3563 /* If we have a full configuration then disable any regulators 3564 * which are not in use or always_on. This will become the 3565 * default behaviour in the future. 3566 */ 3567 list_for_each_entry(rdev, ®ulator_list, list) { 3568 ops = rdev->desc->ops; 3569 c = rdev->constraints; 3570 3571 if (!ops->disable || (c && c->always_on)) 3572 continue; 3573 3574 mutex_lock(&rdev->mutex); 3575 3576 if (rdev->use_count) 3577 goto unlock; 3578 3579 /* If we can't read the status assume it's on. */ 3580 if (ops->is_enabled) 3581 enabled = ops->is_enabled(rdev); 3582 else 3583 enabled = 1; 3584 3585 if (!enabled) 3586 goto unlock; 3587 3588 if (has_full_constraints) { 3589 /* We log since this may kill the system if it 3590 * goes wrong. */ 3591 rdev_info(rdev, "disabling\n"); 3592 ret = ops->disable(rdev); 3593 if (ret != 0) { 3594 rdev_err(rdev, "couldn't disable: %d\n", ret); 3595 } 3596 } else { 3597 /* The intention is that in future we will 3598 * assume that full constraints are provided 3599 * so warn even if we aren't going to do 3600 * anything here. 3601 */ 3602 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3603 } 3604 3605unlock: 3606 mutex_unlock(&rdev->mutex); 3607 } 3608 3609 mutex_unlock(®ulator_list_mutex); 3610 3611 return 0; 3612} 3613late_initcall(regulator_init_complete); 3614