core.c revision 65f735082de35aa4d44e8d0afe862798d0e09e29
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static bool has_full_constraints; 55static bool board_wants_dummy_regulator; 56 57static struct dentry *debugfs_root; 58 59/* 60 * struct regulator_map 61 * 62 * Used to provide symbolic supply names to devices. 63 */ 64struct regulator_map { 65 struct list_head list; 66 const char *dev_name; /* The dev_name() for the consumer */ 67 const char *supply; 68 struct regulator_dev *regulator; 69}; 70 71/* 72 * struct regulator 73 * 74 * One for each consumer device. 75 */ 76struct regulator { 77 struct device *dev; 78 struct list_head list; 79 unsigned int always_on:1; 80 int uA_load; 81 int min_uV; 82 int max_uV; 83 char *supply_name; 84 struct device_attribute dev_attr; 85 struct regulator_dev *rdev; 86 struct dentry *debugfs; 87}; 88 89static int _regulator_is_enabled(struct regulator_dev *rdev); 90static int _regulator_disable(struct regulator_dev *rdev); 91static int _regulator_get_voltage(struct regulator_dev *rdev); 92static int _regulator_get_current_limit(struct regulator_dev *rdev); 93static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 94static void _notifier_call_chain(struct regulator_dev *rdev, 95 unsigned long event, void *data); 96static int _regulator_do_set_voltage(struct regulator_dev *rdev, 97 int min_uV, int max_uV); 98static struct regulator *create_regulator(struct regulator_dev *rdev, 99 struct device *dev, 100 const char *supply_name); 101 102static const char *rdev_get_name(struct regulator_dev *rdev) 103{ 104 if (rdev->constraints && rdev->constraints->name) 105 return rdev->constraints->name; 106 else if (rdev->desc->name) 107 return rdev->desc->name; 108 else 109 return ""; 110} 111 112/* gets the regulator for a given consumer device */ 113static struct regulator *get_device_regulator(struct device *dev) 114{ 115 struct regulator *regulator = NULL; 116 struct regulator_dev *rdev; 117 118 mutex_lock(®ulator_list_mutex); 119 list_for_each_entry(rdev, ®ulator_list, list) { 120 mutex_lock(&rdev->mutex); 121 list_for_each_entry(regulator, &rdev->consumer_list, list) { 122 if (regulator->dev == dev) { 123 mutex_unlock(&rdev->mutex); 124 mutex_unlock(®ulator_list_mutex); 125 return regulator; 126 } 127 } 128 mutex_unlock(&rdev->mutex); 129 } 130 mutex_unlock(®ulator_list_mutex); 131 return NULL; 132} 133 134/** 135 * of_get_regulator - get a regulator device node based on supply name 136 * @dev: Device pointer for the consumer (of regulator) device 137 * @supply: regulator supply name 138 * 139 * Extract the regulator device node corresponding to the supply name. 140 * retruns the device node corresponding to the regulator if found, else 141 * returns NULL. 142 */ 143static struct device_node *of_get_regulator(struct device *dev, const char *supply) 144{ 145 struct device_node *regnode = NULL; 146 char prop_name[32]; /* 32 is max size of property name */ 147 148 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 149 150 snprintf(prop_name, 32, "%s-supply", supply); 151 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 152 153 if (!regnode) { 154 dev_dbg(dev, "Looking up %s property in node %s failed", 155 prop_name, dev->of_node->full_name); 156 return NULL; 157 } 158 return regnode; 159} 160 161static int _regulator_can_change_status(struct regulator_dev *rdev) 162{ 163 if (!rdev->constraints) 164 return 0; 165 166 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 167 return 1; 168 else 169 return 0; 170} 171 172/* Platform voltage constraint check */ 173static int regulator_check_voltage(struct regulator_dev *rdev, 174 int *min_uV, int *max_uV) 175{ 176 BUG_ON(*min_uV > *max_uV); 177 178 if (!rdev->constraints) { 179 rdev_err(rdev, "no constraints\n"); 180 return -ENODEV; 181 } 182 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 183 rdev_err(rdev, "operation not allowed\n"); 184 return -EPERM; 185 } 186 187 if (*max_uV > rdev->constraints->max_uV) 188 *max_uV = rdev->constraints->max_uV; 189 if (*min_uV < rdev->constraints->min_uV) 190 *min_uV = rdev->constraints->min_uV; 191 192 if (*min_uV > *max_uV) { 193 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 194 *min_uV, *max_uV); 195 return -EINVAL; 196 } 197 198 return 0; 199} 200 201/* Make sure we select a voltage that suits the needs of all 202 * regulator consumers 203 */ 204static int regulator_check_consumers(struct regulator_dev *rdev, 205 int *min_uV, int *max_uV) 206{ 207 struct regulator *regulator; 208 209 list_for_each_entry(regulator, &rdev->consumer_list, list) { 210 /* 211 * Assume consumers that didn't say anything are OK 212 * with anything in the constraint range. 213 */ 214 if (!regulator->min_uV && !regulator->max_uV) 215 continue; 216 217 if (*max_uV > regulator->max_uV) 218 *max_uV = regulator->max_uV; 219 if (*min_uV < regulator->min_uV) 220 *min_uV = regulator->min_uV; 221 } 222 223 if (*min_uV > *max_uV) 224 return -EINVAL; 225 226 return 0; 227} 228 229/* current constraint check */ 230static int regulator_check_current_limit(struct regulator_dev *rdev, 231 int *min_uA, int *max_uA) 232{ 233 BUG_ON(*min_uA > *max_uA); 234 235 if (!rdev->constraints) { 236 rdev_err(rdev, "no constraints\n"); 237 return -ENODEV; 238 } 239 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 240 rdev_err(rdev, "operation not allowed\n"); 241 return -EPERM; 242 } 243 244 if (*max_uA > rdev->constraints->max_uA) 245 *max_uA = rdev->constraints->max_uA; 246 if (*min_uA < rdev->constraints->min_uA) 247 *min_uA = rdev->constraints->min_uA; 248 249 if (*min_uA > *max_uA) { 250 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 251 *min_uA, *max_uA); 252 return -EINVAL; 253 } 254 255 return 0; 256} 257 258/* operating mode constraint check */ 259static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 260{ 261 switch (*mode) { 262 case REGULATOR_MODE_FAST: 263 case REGULATOR_MODE_NORMAL: 264 case REGULATOR_MODE_IDLE: 265 case REGULATOR_MODE_STANDBY: 266 break; 267 default: 268 rdev_err(rdev, "invalid mode %x specified\n", *mode); 269 return -EINVAL; 270 } 271 272 if (!rdev->constraints) { 273 rdev_err(rdev, "no constraints\n"); 274 return -ENODEV; 275 } 276 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 277 rdev_err(rdev, "operation not allowed\n"); 278 return -EPERM; 279 } 280 281 /* The modes are bitmasks, the most power hungry modes having 282 * the lowest values. If the requested mode isn't supported 283 * try higher modes. */ 284 while (*mode) { 285 if (rdev->constraints->valid_modes_mask & *mode) 286 return 0; 287 *mode /= 2; 288 } 289 290 return -EINVAL; 291} 292 293/* dynamic regulator mode switching constraint check */ 294static int regulator_check_drms(struct regulator_dev *rdev) 295{ 296 if (!rdev->constraints) { 297 rdev_err(rdev, "no constraints\n"); 298 return -ENODEV; 299 } 300 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 301 rdev_err(rdev, "operation not allowed\n"); 302 return -EPERM; 303 } 304 return 0; 305} 306 307static ssize_t device_requested_uA_show(struct device *dev, 308 struct device_attribute *attr, char *buf) 309{ 310 struct regulator *regulator; 311 312 regulator = get_device_regulator(dev); 313 if (regulator == NULL) 314 return 0; 315 316 return sprintf(buf, "%d\n", regulator->uA_load); 317} 318 319static ssize_t regulator_uV_show(struct device *dev, 320 struct device_attribute *attr, char *buf) 321{ 322 struct regulator_dev *rdev = dev_get_drvdata(dev); 323 ssize_t ret; 324 325 mutex_lock(&rdev->mutex); 326 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 327 mutex_unlock(&rdev->mutex); 328 329 return ret; 330} 331static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 332 333static ssize_t regulator_uA_show(struct device *dev, 334 struct device_attribute *attr, char *buf) 335{ 336 struct regulator_dev *rdev = dev_get_drvdata(dev); 337 338 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 339} 340static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 341 342static ssize_t regulator_name_show(struct device *dev, 343 struct device_attribute *attr, char *buf) 344{ 345 struct regulator_dev *rdev = dev_get_drvdata(dev); 346 347 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 348} 349 350static ssize_t regulator_print_opmode(char *buf, int mode) 351{ 352 switch (mode) { 353 case REGULATOR_MODE_FAST: 354 return sprintf(buf, "fast\n"); 355 case REGULATOR_MODE_NORMAL: 356 return sprintf(buf, "normal\n"); 357 case REGULATOR_MODE_IDLE: 358 return sprintf(buf, "idle\n"); 359 case REGULATOR_MODE_STANDBY: 360 return sprintf(buf, "standby\n"); 361 } 362 return sprintf(buf, "unknown\n"); 363} 364 365static ssize_t regulator_opmode_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367{ 368 struct regulator_dev *rdev = dev_get_drvdata(dev); 369 370 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 371} 372static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 373 374static ssize_t regulator_print_state(char *buf, int state) 375{ 376 if (state > 0) 377 return sprintf(buf, "enabled\n"); 378 else if (state == 0) 379 return sprintf(buf, "disabled\n"); 380 else 381 return sprintf(buf, "unknown\n"); 382} 383 384static ssize_t regulator_state_show(struct device *dev, 385 struct device_attribute *attr, char *buf) 386{ 387 struct regulator_dev *rdev = dev_get_drvdata(dev); 388 ssize_t ret; 389 390 mutex_lock(&rdev->mutex); 391 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 392 mutex_unlock(&rdev->mutex); 393 394 return ret; 395} 396static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 397 398static ssize_t regulator_status_show(struct device *dev, 399 struct device_attribute *attr, char *buf) 400{ 401 struct regulator_dev *rdev = dev_get_drvdata(dev); 402 int status; 403 char *label; 404 405 status = rdev->desc->ops->get_status(rdev); 406 if (status < 0) 407 return status; 408 409 switch (status) { 410 case REGULATOR_STATUS_OFF: 411 label = "off"; 412 break; 413 case REGULATOR_STATUS_ON: 414 label = "on"; 415 break; 416 case REGULATOR_STATUS_ERROR: 417 label = "error"; 418 break; 419 case REGULATOR_STATUS_FAST: 420 label = "fast"; 421 break; 422 case REGULATOR_STATUS_NORMAL: 423 label = "normal"; 424 break; 425 case REGULATOR_STATUS_IDLE: 426 label = "idle"; 427 break; 428 case REGULATOR_STATUS_STANDBY: 429 label = "standby"; 430 break; 431 default: 432 return -ERANGE; 433 } 434 435 return sprintf(buf, "%s\n", label); 436} 437static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 438 439static ssize_t regulator_min_uA_show(struct device *dev, 440 struct device_attribute *attr, char *buf) 441{ 442 struct regulator_dev *rdev = dev_get_drvdata(dev); 443 444 if (!rdev->constraints) 445 return sprintf(buf, "constraint not defined\n"); 446 447 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 448} 449static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 450 451static ssize_t regulator_max_uA_show(struct device *dev, 452 struct device_attribute *attr, char *buf) 453{ 454 struct regulator_dev *rdev = dev_get_drvdata(dev); 455 456 if (!rdev->constraints) 457 return sprintf(buf, "constraint not defined\n"); 458 459 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 460} 461static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 462 463static ssize_t regulator_min_uV_show(struct device *dev, 464 struct device_attribute *attr, char *buf) 465{ 466 struct regulator_dev *rdev = dev_get_drvdata(dev); 467 468 if (!rdev->constraints) 469 return sprintf(buf, "constraint not defined\n"); 470 471 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 472} 473static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 474 475static ssize_t regulator_max_uV_show(struct device *dev, 476 struct device_attribute *attr, char *buf) 477{ 478 struct regulator_dev *rdev = dev_get_drvdata(dev); 479 480 if (!rdev->constraints) 481 return sprintf(buf, "constraint not defined\n"); 482 483 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 484} 485static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 486 487static ssize_t regulator_total_uA_show(struct device *dev, 488 struct device_attribute *attr, char *buf) 489{ 490 struct regulator_dev *rdev = dev_get_drvdata(dev); 491 struct regulator *regulator; 492 int uA = 0; 493 494 mutex_lock(&rdev->mutex); 495 list_for_each_entry(regulator, &rdev->consumer_list, list) 496 uA += regulator->uA_load; 497 mutex_unlock(&rdev->mutex); 498 return sprintf(buf, "%d\n", uA); 499} 500static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 501 502static ssize_t regulator_num_users_show(struct device *dev, 503 struct device_attribute *attr, char *buf) 504{ 505 struct regulator_dev *rdev = dev_get_drvdata(dev); 506 return sprintf(buf, "%d\n", rdev->use_count); 507} 508 509static ssize_t regulator_type_show(struct device *dev, 510 struct device_attribute *attr, char *buf) 511{ 512 struct regulator_dev *rdev = dev_get_drvdata(dev); 513 514 switch (rdev->desc->type) { 515 case REGULATOR_VOLTAGE: 516 return sprintf(buf, "voltage\n"); 517 case REGULATOR_CURRENT: 518 return sprintf(buf, "current\n"); 519 } 520 return sprintf(buf, "unknown\n"); 521} 522 523static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 524 struct device_attribute *attr, char *buf) 525{ 526 struct regulator_dev *rdev = dev_get_drvdata(dev); 527 528 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 529} 530static DEVICE_ATTR(suspend_mem_microvolts, 0444, 531 regulator_suspend_mem_uV_show, NULL); 532 533static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 534 struct device_attribute *attr, char *buf) 535{ 536 struct regulator_dev *rdev = dev_get_drvdata(dev); 537 538 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 539} 540static DEVICE_ATTR(suspend_disk_microvolts, 0444, 541 regulator_suspend_disk_uV_show, NULL); 542 543static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545{ 546 struct regulator_dev *rdev = dev_get_drvdata(dev); 547 548 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 549} 550static DEVICE_ATTR(suspend_standby_microvolts, 0444, 551 regulator_suspend_standby_uV_show, NULL); 552 553static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 554 struct device_attribute *attr, char *buf) 555{ 556 struct regulator_dev *rdev = dev_get_drvdata(dev); 557 558 return regulator_print_opmode(buf, 559 rdev->constraints->state_mem.mode); 560} 561static DEVICE_ATTR(suspend_mem_mode, 0444, 562 regulator_suspend_mem_mode_show, NULL); 563 564static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 565 struct device_attribute *attr, char *buf) 566{ 567 struct regulator_dev *rdev = dev_get_drvdata(dev); 568 569 return regulator_print_opmode(buf, 570 rdev->constraints->state_disk.mode); 571} 572static DEVICE_ATTR(suspend_disk_mode, 0444, 573 regulator_suspend_disk_mode_show, NULL); 574 575static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 576 struct device_attribute *attr, char *buf) 577{ 578 struct regulator_dev *rdev = dev_get_drvdata(dev); 579 580 return regulator_print_opmode(buf, 581 rdev->constraints->state_standby.mode); 582} 583static DEVICE_ATTR(suspend_standby_mode, 0444, 584 regulator_suspend_standby_mode_show, NULL); 585 586static ssize_t regulator_suspend_mem_state_show(struct device *dev, 587 struct device_attribute *attr, char *buf) 588{ 589 struct regulator_dev *rdev = dev_get_drvdata(dev); 590 591 return regulator_print_state(buf, 592 rdev->constraints->state_mem.enabled); 593} 594static DEVICE_ATTR(suspend_mem_state, 0444, 595 regulator_suspend_mem_state_show, NULL); 596 597static ssize_t regulator_suspend_disk_state_show(struct device *dev, 598 struct device_attribute *attr, char *buf) 599{ 600 struct regulator_dev *rdev = dev_get_drvdata(dev); 601 602 return regulator_print_state(buf, 603 rdev->constraints->state_disk.enabled); 604} 605static DEVICE_ATTR(suspend_disk_state, 0444, 606 regulator_suspend_disk_state_show, NULL); 607 608static ssize_t regulator_suspend_standby_state_show(struct device *dev, 609 struct device_attribute *attr, char *buf) 610{ 611 struct regulator_dev *rdev = dev_get_drvdata(dev); 612 613 return regulator_print_state(buf, 614 rdev->constraints->state_standby.enabled); 615} 616static DEVICE_ATTR(suspend_standby_state, 0444, 617 regulator_suspend_standby_state_show, NULL); 618 619 620/* 621 * These are the only attributes are present for all regulators. 622 * Other attributes are a function of regulator functionality. 623 */ 624static struct device_attribute regulator_dev_attrs[] = { 625 __ATTR(name, 0444, regulator_name_show, NULL), 626 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 627 __ATTR(type, 0444, regulator_type_show, NULL), 628 __ATTR_NULL, 629}; 630 631static void regulator_dev_release(struct device *dev) 632{ 633 struct regulator_dev *rdev = dev_get_drvdata(dev); 634 kfree(rdev); 635} 636 637static struct class regulator_class = { 638 .name = "regulator", 639 .dev_release = regulator_dev_release, 640 .dev_attrs = regulator_dev_attrs, 641}; 642 643/* Calculate the new optimum regulator operating mode based on the new total 644 * consumer load. All locks held by caller */ 645static void drms_uA_update(struct regulator_dev *rdev) 646{ 647 struct regulator *sibling; 648 int current_uA = 0, output_uV, input_uV, err; 649 unsigned int mode; 650 651 err = regulator_check_drms(rdev); 652 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 653 (!rdev->desc->ops->get_voltage && 654 !rdev->desc->ops->get_voltage_sel) || 655 !rdev->desc->ops->set_mode) 656 return; 657 658 /* get output voltage */ 659 output_uV = _regulator_get_voltage(rdev); 660 if (output_uV <= 0) 661 return; 662 663 /* get input voltage */ 664 input_uV = 0; 665 if (rdev->supply) 666 input_uV = regulator_get_voltage(rdev->supply); 667 if (input_uV <= 0) 668 input_uV = rdev->constraints->input_uV; 669 if (input_uV <= 0) 670 return; 671 672 /* calc total requested load */ 673 list_for_each_entry(sibling, &rdev->consumer_list, list) 674 current_uA += sibling->uA_load; 675 676 /* now get the optimum mode for our new total regulator load */ 677 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 678 output_uV, current_uA); 679 680 /* check the new mode is allowed */ 681 err = regulator_mode_constrain(rdev, &mode); 682 if (err == 0) 683 rdev->desc->ops->set_mode(rdev, mode); 684} 685 686static int suspend_set_state(struct regulator_dev *rdev, 687 struct regulator_state *rstate) 688{ 689 int ret = 0; 690 691 /* If we have no suspend mode configration don't set anything; 692 * only warn if the driver implements set_suspend_voltage or 693 * set_suspend_mode callback. 694 */ 695 if (!rstate->enabled && !rstate->disabled) { 696 if (rdev->desc->ops->set_suspend_voltage || 697 rdev->desc->ops->set_suspend_mode) 698 rdev_warn(rdev, "No configuration\n"); 699 return 0; 700 } 701 702 if (rstate->enabled && rstate->disabled) { 703 rdev_err(rdev, "invalid configuration\n"); 704 return -EINVAL; 705 } 706 707 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 708 ret = rdev->desc->ops->set_suspend_enable(rdev); 709 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 710 ret = rdev->desc->ops->set_suspend_disable(rdev); 711 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 712 ret = 0; 713 714 if (ret < 0) { 715 rdev_err(rdev, "failed to enabled/disable\n"); 716 return ret; 717 } 718 719 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 720 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 721 if (ret < 0) { 722 rdev_err(rdev, "failed to set voltage\n"); 723 return ret; 724 } 725 } 726 727 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 728 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 729 if (ret < 0) { 730 rdev_err(rdev, "failed to set mode\n"); 731 return ret; 732 } 733 } 734 return ret; 735} 736 737/* locks held by caller */ 738static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 739{ 740 if (!rdev->constraints) 741 return -EINVAL; 742 743 switch (state) { 744 case PM_SUSPEND_STANDBY: 745 return suspend_set_state(rdev, 746 &rdev->constraints->state_standby); 747 case PM_SUSPEND_MEM: 748 return suspend_set_state(rdev, 749 &rdev->constraints->state_mem); 750 case PM_SUSPEND_MAX: 751 return suspend_set_state(rdev, 752 &rdev->constraints->state_disk); 753 default: 754 return -EINVAL; 755 } 756} 757 758static void print_constraints(struct regulator_dev *rdev) 759{ 760 struct regulation_constraints *constraints = rdev->constraints; 761 char buf[80] = ""; 762 int count = 0; 763 int ret; 764 765 if (constraints->min_uV && constraints->max_uV) { 766 if (constraints->min_uV == constraints->max_uV) 767 count += sprintf(buf + count, "%d mV ", 768 constraints->min_uV / 1000); 769 else 770 count += sprintf(buf + count, "%d <--> %d mV ", 771 constraints->min_uV / 1000, 772 constraints->max_uV / 1000); 773 } 774 775 if (!constraints->min_uV || 776 constraints->min_uV != constraints->max_uV) { 777 ret = _regulator_get_voltage(rdev); 778 if (ret > 0) 779 count += sprintf(buf + count, "at %d mV ", ret / 1000); 780 } 781 782 if (constraints->uV_offset) 783 count += sprintf(buf, "%dmV offset ", 784 constraints->uV_offset / 1000); 785 786 if (constraints->min_uA && constraints->max_uA) { 787 if (constraints->min_uA == constraints->max_uA) 788 count += sprintf(buf + count, "%d mA ", 789 constraints->min_uA / 1000); 790 else 791 count += sprintf(buf + count, "%d <--> %d mA ", 792 constraints->min_uA / 1000, 793 constraints->max_uA / 1000); 794 } 795 796 if (!constraints->min_uA || 797 constraints->min_uA != constraints->max_uA) { 798 ret = _regulator_get_current_limit(rdev); 799 if (ret > 0) 800 count += sprintf(buf + count, "at %d mA ", ret / 1000); 801 } 802 803 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 804 count += sprintf(buf + count, "fast "); 805 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 806 count += sprintf(buf + count, "normal "); 807 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 808 count += sprintf(buf + count, "idle "); 809 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 810 count += sprintf(buf + count, "standby"); 811 812 rdev_info(rdev, "%s\n", buf); 813 814 if ((constraints->min_uV != constraints->max_uV) && 815 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 816 rdev_warn(rdev, 817 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 818} 819 820static int machine_constraints_voltage(struct regulator_dev *rdev, 821 struct regulation_constraints *constraints) 822{ 823 struct regulator_ops *ops = rdev->desc->ops; 824 int ret; 825 826 /* do we need to apply the constraint voltage */ 827 if (rdev->constraints->apply_uV && 828 rdev->constraints->min_uV == rdev->constraints->max_uV) { 829 ret = _regulator_do_set_voltage(rdev, 830 rdev->constraints->min_uV, 831 rdev->constraints->max_uV); 832 if (ret < 0) { 833 rdev_err(rdev, "failed to apply %duV constraint\n", 834 rdev->constraints->min_uV); 835 return ret; 836 } 837 } 838 839 /* constrain machine-level voltage specs to fit 840 * the actual range supported by this regulator. 841 */ 842 if (ops->list_voltage && rdev->desc->n_voltages) { 843 int count = rdev->desc->n_voltages; 844 int i; 845 int min_uV = INT_MAX; 846 int max_uV = INT_MIN; 847 int cmin = constraints->min_uV; 848 int cmax = constraints->max_uV; 849 850 /* it's safe to autoconfigure fixed-voltage supplies 851 and the constraints are used by list_voltage. */ 852 if (count == 1 && !cmin) { 853 cmin = 1; 854 cmax = INT_MAX; 855 constraints->min_uV = cmin; 856 constraints->max_uV = cmax; 857 } 858 859 /* voltage constraints are optional */ 860 if ((cmin == 0) && (cmax == 0)) 861 return 0; 862 863 /* else require explicit machine-level constraints */ 864 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 865 rdev_err(rdev, "invalid voltage constraints\n"); 866 return -EINVAL; 867 } 868 869 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 870 for (i = 0; i < count; i++) { 871 int value; 872 873 value = ops->list_voltage(rdev, i); 874 if (value <= 0) 875 continue; 876 877 /* maybe adjust [min_uV..max_uV] */ 878 if (value >= cmin && value < min_uV) 879 min_uV = value; 880 if (value <= cmax && value > max_uV) 881 max_uV = value; 882 } 883 884 /* final: [min_uV..max_uV] valid iff constraints valid */ 885 if (max_uV < min_uV) { 886 rdev_err(rdev, "unsupportable voltage constraints\n"); 887 return -EINVAL; 888 } 889 890 /* use regulator's subset of machine constraints */ 891 if (constraints->min_uV < min_uV) { 892 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 893 constraints->min_uV, min_uV); 894 constraints->min_uV = min_uV; 895 } 896 if (constraints->max_uV > max_uV) { 897 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 898 constraints->max_uV, max_uV); 899 constraints->max_uV = max_uV; 900 } 901 } 902 903 return 0; 904} 905 906/** 907 * set_machine_constraints - sets regulator constraints 908 * @rdev: regulator source 909 * @constraints: constraints to apply 910 * 911 * Allows platform initialisation code to define and constrain 912 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 913 * Constraints *must* be set by platform code in order for some 914 * regulator operations to proceed i.e. set_voltage, set_current_limit, 915 * set_mode. 916 */ 917static int set_machine_constraints(struct regulator_dev *rdev, 918 const struct regulation_constraints *constraints) 919{ 920 int ret = 0; 921 struct regulator_ops *ops = rdev->desc->ops; 922 923 if (constraints) 924 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 925 GFP_KERNEL); 926 else 927 rdev->constraints = kzalloc(sizeof(*constraints), 928 GFP_KERNEL); 929 if (!rdev->constraints) 930 return -ENOMEM; 931 932 ret = machine_constraints_voltage(rdev, rdev->constraints); 933 if (ret != 0) 934 goto out; 935 936 /* do we need to setup our suspend state */ 937 if (rdev->constraints->initial_state) { 938 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 939 if (ret < 0) { 940 rdev_err(rdev, "failed to set suspend state\n"); 941 goto out; 942 } 943 } 944 945 if (rdev->constraints->initial_mode) { 946 if (!ops->set_mode) { 947 rdev_err(rdev, "no set_mode operation\n"); 948 ret = -EINVAL; 949 goto out; 950 } 951 952 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 953 if (ret < 0) { 954 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 955 goto out; 956 } 957 } 958 959 /* If the constraints say the regulator should be on at this point 960 * and we have control then make sure it is enabled. 961 */ 962 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 963 ops->enable) { 964 ret = ops->enable(rdev); 965 if (ret < 0) { 966 rdev_err(rdev, "failed to enable\n"); 967 goto out; 968 } 969 } 970 971 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 972 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 973 if (ret < 0) { 974 rdev_err(rdev, "failed to set ramp_delay\n"); 975 goto out; 976 } 977 } 978 979 print_constraints(rdev); 980 return 0; 981out: 982 kfree(rdev->constraints); 983 rdev->constraints = NULL; 984 return ret; 985} 986 987/** 988 * set_supply - set regulator supply regulator 989 * @rdev: regulator name 990 * @supply_rdev: supply regulator name 991 * 992 * Called by platform initialisation code to set the supply regulator for this 993 * regulator. This ensures that a regulators supply will also be enabled by the 994 * core if it's child is enabled. 995 */ 996static int set_supply(struct regulator_dev *rdev, 997 struct regulator_dev *supply_rdev) 998{ 999 int err; 1000 1001 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1002 1003 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1004 if (rdev->supply == NULL) { 1005 err = -ENOMEM; 1006 return err; 1007 } 1008 1009 return 0; 1010} 1011 1012/** 1013 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1014 * @rdev: regulator source 1015 * @consumer_dev_name: dev_name() string for device supply applies to 1016 * @supply: symbolic name for supply 1017 * 1018 * Allows platform initialisation code to map physical regulator 1019 * sources to symbolic names for supplies for use by devices. Devices 1020 * should use these symbolic names to request regulators, avoiding the 1021 * need to provide board-specific regulator names as platform data. 1022 */ 1023static int set_consumer_device_supply(struct regulator_dev *rdev, 1024 const char *consumer_dev_name, 1025 const char *supply) 1026{ 1027 struct regulator_map *node; 1028 int has_dev; 1029 1030 if (supply == NULL) 1031 return -EINVAL; 1032 1033 if (consumer_dev_name != NULL) 1034 has_dev = 1; 1035 else 1036 has_dev = 0; 1037 1038 list_for_each_entry(node, ®ulator_map_list, list) { 1039 if (node->dev_name && consumer_dev_name) { 1040 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1041 continue; 1042 } else if (node->dev_name || consumer_dev_name) { 1043 continue; 1044 } 1045 1046 if (strcmp(node->supply, supply) != 0) 1047 continue; 1048 1049 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1050 consumer_dev_name, 1051 dev_name(&node->regulator->dev), 1052 node->regulator->desc->name, 1053 supply, 1054 dev_name(&rdev->dev), rdev_get_name(rdev)); 1055 return -EBUSY; 1056 } 1057 1058 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1059 if (node == NULL) 1060 return -ENOMEM; 1061 1062 node->regulator = rdev; 1063 node->supply = supply; 1064 1065 if (has_dev) { 1066 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1067 if (node->dev_name == NULL) { 1068 kfree(node); 1069 return -ENOMEM; 1070 } 1071 } 1072 1073 list_add(&node->list, ®ulator_map_list); 1074 return 0; 1075} 1076 1077static void unset_regulator_supplies(struct regulator_dev *rdev) 1078{ 1079 struct regulator_map *node, *n; 1080 1081 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1082 if (rdev == node->regulator) { 1083 list_del(&node->list); 1084 kfree(node->dev_name); 1085 kfree(node); 1086 } 1087 } 1088} 1089 1090#define REG_STR_SIZE 64 1091 1092static struct regulator *create_regulator(struct regulator_dev *rdev, 1093 struct device *dev, 1094 const char *supply_name) 1095{ 1096 struct regulator *regulator; 1097 char buf[REG_STR_SIZE]; 1098 int err, size; 1099 1100 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1101 if (regulator == NULL) 1102 return NULL; 1103 1104 mutex_lock(&rdev->mutex); 1105 regulator->rdev = rdev; 1106 list_add(®ulator->list, &rdev->consumer_list); 1107 1108 if (dev) { 1109 /* create a 'requested_microamps_name' sysfs entry */ 1110 size = scnprintf(buf, REG_STR_SIZE, 1111 "microamps_requested_%s-%s", 1112 dev_name(dev), supply_name); 1113 if (size >= REG_STR_SIZE) 1114 goto overflow_err; 1115 1116 regulator->dev = dev; 1117 sysfs_attr_init(®ulator->dev_attr.attr); 1118 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1119 if (regulator->dev_attr.attr.name == NULL) 1120 goto attr_name_err; 1121 1122 regulator->dev_attr.attr.mode = 0444; 1123 regulator->dev_attr.show = device_requested_uA_show; 1124 err = device_create_file(dev, ®ulator->dev_attr); 1125 if (err < 0) { 1126 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1127 goto attr_name_err; 1128 } 1129 1130 /* also add a link to the device sysfs entry */ 1131 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1132 dev->kobj.name, supply_name); 1133 if (size >= REG_STR_SIZE) 1134 goto attr_err; 1135 1136 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1137 if (regulator->supply_name == NULL) 1138 goto attr_err; 1139 1140 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1141 buf); 1142 if (err) { 1143 rdev_warn(rdev, "could not add device link %s err %d\n", 1144 dev->kobj.name, err); 1145 goto link_name_err; 1146 } 1147 } else { 1148 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1149 if (regulator->supply_name == NULL) 1150 goto attr_err; 1151 } 1152 1153 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1154 rdev->debugfs); 1155 if (!regulator->debugfs) { 1156 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1157 } else { 1158 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1159 ®ulator->uA_load); 1160 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1161 ®ulator->min_uV); 1162 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1163 ®ulator->max_uV); 1164 } 1165 1166 /* 1167 * Check now if the regulator is an always on regulator - if 1168 * it is then we don't need to do nearly so much work for 1169 * enable/disable calls. 1170 */ 1171 if (!_regulator_can_change_status(rdev) && 1172 _regulator_is_enabled(rdev)) 1173 regulator->always_on = true; 1174 1175 mutex_unlock(&rdev->mutex); 1176 return regulator; 1177link_name_err: 1178 kfree(regulator->supply_name); 1179attr_err: 1180 device_remove_file(regulator->dev, ®ulator->dev_attr); 1181attr_name_err: 1182 kfree(regulator->dev_attr.attr.name); 1183overflow_err: 1184 list_del(®ulator->list); 1185 kfree(regulator); 1186 mutex_unlock(&rdev->mutex); 1187 return NULL; 1188} 1189 1190static int _regulator_get_enable_time(struct regulator_dev *rdev) 1191{ 1192 if (!rdev->desc->ops->enable_time) 1193 return rdev->desc->enable_time; 1194 return rdev->desc->ops->enable_time(rdev); 1195} 1196 1197static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1198 const char *supply, 1199 int *ret) 1200{ 1201 struct regulator_dev *r; 1202 struct device_node *node; 1203 struct regulator_map *map; 1204 const char *devname = NULL; 1205 1206 /* first do a dt based lookup */ 1207 if (dev && dev->of_node) { 1208 node = of_get_regulator(dev, supply); 1209 if (node) { 1210 list_for_each_entry(r, ®ulator_list, list) 1211 if (r->dev.parent && 1212 node == r->dev.of_node) 1213 return r; 1214 } else { 1215 /* 1216 * If we couldn't even get the node then it's 1217 * not just that the device didn't register 1218 * yet, there's no node and we'll never 1219 * succeed. 1220 */ 1221 *ret = -ENODEV; 1222 } 1223 } 1224 1225 /* if not found, try doing it non-dt way */ 1226 if (dev) 1227 devname = dev_name(dev); 1228 1229 list_for_each_entry(r, ®ulator_list, list) 1230 if (strcmp(rdev_get_name(r), supply) == 0) 1231 return r; 1232 1233 list_for_each_entry(map, ®ulator_map_list, list) { 1234 /* If the mapping has a device set up it must match */ 1235 if (map->dev_name && 1236 (!devname || strcmp(map->dev_name, devname))) 1237 continue; 1238 1239 if (strcmp(map->supply, supply) == 0) 1240 return map->regulator; 1241 } 1242 1243 1244 return NULL; 1245} 1246 1247/* Internal regulator request function */ 1248static struct regulator *_regulator_get(struct device *dev, const char *id, 1249 int exclusive) 1250{ 1251 struct regulator_dev *rdev; 1252 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1253 const char *devname = NULL; 1254 int ret; 1255 1256 if (id == NULL) { 1257 pr_err("get() with no identifier\n"); 1258 return regulator; 1259 } 1260 1261 if (dev) 1262 devname = dev_name(dev); 1263 1264 mutex_lock(®ulator_list_mutex); 1265 1266 rdev = regulator_dev_lookup(dev, id, &ret); 1267 if (rdev) 1268 goto found; 1269 1270 if (board_wants_dummy_regulator) { 1271 rdev = dummy_regulator_rdev; 1272 goto found; 1273 } 1274 1275#ifdef CONFIG_REGULATOR_DUMMY 1276 if (!devname) 1277 devname = "deviceless"; 1278 1279 /* If the board didn't flag that it was fully constrained then 1280 * substitute in a dummy regulator so consumers can continue. 1281 */ 1282 if (!has_full_constraints) { 1283 pr_warn("%s supply %s not found, using dummy regulator\n", 1284 devname, id); 1285 rdev = dummy_regulator_rdev; 1286 goto found; 1287 } 1288#endif 1289 1290 mutex_unlock(®ulator_list_mutex); 1291 return regulator; 1292 1293found: 1294 if (rdev->exclusive) { 1295 regulator = ERR_PTR(-EPERM); 1296 goto out; 1297 } 1298 1299 if (exclusive && rdev->open_count) { 1300 regulator = ERR_PTR(-EBUSY); 1301 goto out; 1302 } 1303 1304 if (!try_module_get(rdev->owner)) 1305 goto out; 1306 1307 regulator = create_regulator(rdev, dev, id); 1308 if (regulator == NULL) { 1309 regulator = ERR_PTR(-ENOMEM); 1310 module_put(rdev->owner); 1311 goto out; 1312 } 1313 1314 rdev->open_count++; 1315 if (exclusive) { 1316 rdev->exclusive = 1; 1317 1318 ret = _regulator_is_enabled(rdev); 1319 if (ret > 0) 1320 rdev->use_count = 1; 1321 else 1322 rdev->use_count = 0; 1323 } 1324 1325out: 1326 mutex_unlock(®ulator_list_mutex); 1327 1328 return regulator; 1329} 1330 1331/** 1332 * regulator_get - lookup and obtain a reference to a regulator. 1333 * @dev: device for regulator "consumer" 1334 * @id: Supply name or regulator ID. 1335 * 1336 * Returns a struct regulator corresponding to the regulator producer, 1337 * or IS_ERR() condition containing errno. 1338 * 1339 * Use of supply names configured via regulator_set_device_supply() is 1340 * strongly encouraged. It is recommended that the supply name used 1341 * should match the name used for the supply and/or the relevant 1342 * device pins in the datasheet. 1343 */ 1344struct regulator *regulator_get(struct device *dev, const char *id) 1345{ 1346 return _regulator_get(dev, id, 0); 1347} 1348EXPORT_SYMBOL_GPL(regulator_get); 1349 1350static void devm_regulator_release(struct device *dev, void *res) 1351{ 1352 regulator_put(*(struct regulator **)res); 1353} 1354 1355/** 1356 * devm_regulator_get - Resource managed regulator_get() 1357 * @dev: device for regulator "consumer" 1358 * @id: Supply name or regulator ID. 1359 * 1360 * Managed regulator_get(). Regulators returned from this function are 1361 * automatically regulator_put() on driver detach. See regulator_get() for more 1362 * information. 1363 */ 1364struct regulator *devm_regulator_get(struct device *dev, const char *id) 1365{ 1366 struct regulator **ptr, *regulator; 1367 1368 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1369 if (!ptr) 1370 return ERR_PTR(-ENOMEM); 1371 1372 regulator = regulator_get(dev, id); 1373 if (!IS_ERR(regulator)) { 1374 *ptr = regulator; 1375 devres_add(dev, ptr); 1376 } else { 1377 devres_free(ptr); 1378 } 1379 1380 return regulator; 1381} 1382EXPORT_SYMBOL_GPL(devm_regulator_get); 1383 1384/** 1385 * regulator_get_exclusive - obtain exclusive access to a regulator. 1386 * @dev: device for regulator "consumer" 1387 * @id: Supply name or regulator ID. 1388 * 1389 * Returns a struct regulator corresponding to the regulator producer, 1390 * or IS_ERR() condition containing errno. Other consumers will be 1391 * unable to obtain this reference is held and the use count for the 1392 * regulator will be initialised to reflect the current state of the 1393 * regulator. 1394 * 1395 * This is intended for use by consumers which cannot tolerate shared 1396 * use of the regulator such as those which need to force the 1397 * regulator off for correct operation of the hardware they are 1398 * controlling. 1399 * 1400 * Use of supply names configured via regulator_set_device_supply() is 1401 * strongly encouraged. It is recommended that the supply name used 1402 * should match the name used for the supply and/or the relevant 1403 * device pins in the datasheet. 1404 */ 1405struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1406{ 1407 return _regulator_get(dev, id, 1); 1408} 1409EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1410 1411/** 1412 * regulator_put - "free" the regulator source 1413 * @regulator: regulator source 1414 * 1415 * Note: drivers must ensure that all regulator_enable calls made on this 1416 * regulator source are balanced by regulator_disable calls prior to calling 1417 * this function. 1418 */ 1419void regulator_put(struct regulator *regulator) 1420{ 1421 struct regulator_dev *rdev; 1422 1423 if (regulator == NULL || IS_ERR(regulator)) 1424 return; 1425 1426 mutex_lock(®ulator_list_mutex); 1427 rdev = regulator->rdev; 1428 1429 debugfs_remove_recursive(regulator->debugfs); 1430 1431 /* remove any sysfs entries */ 1432 if (regulator->dev) { 1433 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1434 device_remove_file(regulator->dev, ®ulator->dev_attr); 1435 kfree(regulator->dev_attr.attr.name); 1436 } 1437 kfree(regulator->supply_name); 1438 list_del(®ulator->list); 1439 kfree(regulator); 1440 1441 rdev->open_count--; 1442 rdev->exclusive = 0; 1443 1444 module_put(rdev->owner); 1445 mutex_unlock(®ulator_list_mutex); 1446} 1447EXPORT_SYMBOL_GPL(regulator_put); 1448 1449static int devm_regulator_match(struct device *dev, void *res, void *data) 1450{ 1451 struct regulator **r = res; 1452 if (!r || !*r) { 1453 WARN_ON(!r || !*r); 1454 return 0; 1455 } 1456 return *r == data; 1457} 1458 1459/** 1460 * devm_regulator_put - Resource managed regulator_put() 1461 * @regulator: regulator to free 1462 * 1463 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1464 * this function will not need to be called and the resource management 1465 * code will ensure that the resource is freed. 1466 */ 1467void devm_regulator_put(struct regulator *regulator) 1468{ 1469 int rc; 1470 1471 rc = devres_release(regulator->dev, devm_regulator_release, 1472 devm_regulator_match, regulator); 1473 if (rc == 0) 1474 regulator_put(regulator); 1475 else 1476 WARN_ON(rc); 1477} 1478EXPORT_SYMBOL_GPL(devm_regulator_put); 1479 1480static int _regulator_do_enable(struct regulator_dev *rdev) 1481{ 1482 int ret, delay; 1483 1484 /* Query before enabling in case configuration dependent. */ 1485 ret = _regulator_get_enable_time(rdev); 1486 if (ret >= 0) { 1487 delay = ret; 1488 } else { 1489 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1490 delay = 0; 1491 } 1492 1493 trace_regulator_enable(rdev_get_name(rdev)); 1494 1495 if (rdev->ena_gpio) { 1496 gpio_set_value_cansleep(rdev->ena_gpio, 1497 !rdev->ena_gpio_invert); 1498 rdev->ena_gpio_state = 1; 1499 } else if (rdev->desc->ops->enable) { 1500 ret = rdev->desc->ops->enable(rdev); 1501 if (ret < 0) 1502 return ret; 1503 } else { 1504 return -EINVAL; 1505 } 1506 1507 /* Allow the regulator to ramp; it would be useful to extend 1508 * this for bulk operations so that the regulators can ramp 1509 * together. */ 1510 trace_regulator_enable_delay(rdev_get_name(rdev)); 1511 1512 if (delay >= 1000) { 1513 mdelay(delay / 1000); 1514 udelay(delay % 1000); 1515 } else if (delay) { 1516 udelay(delay); 1517 } 1518 1519 trace_regulator_enable_complete(rdev_get_name(rdev)); 1520 1521 return 0; 1522} 1523 1524/* locks held by regulator_enable() */ 1525static int _regulator_enable(struct regulator_dev *rdev) 1526{ 1527 int ret; 1528 1529 /* check voltage and requested load before enabling */ 1530 if (rdev->constraints && 1531 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1532 drms_uA_update(rdev); 1533 1534 if (rdev->use_count == 0) { 1535 /* The regulator may on if it's not switchable or left on */ 1536 ret = _regulator_is_enabled(rdev); 1537 if (ret == -EINVAL || ret == 0) { 1538 if (!_regulator_can_change_status(rdev)) 1539 return -EPERM; 1540 1541 ret = _regulator_do_enable(rdev); 1542 if (ret < 0) 1543 return ret; 1544 1545 } else if (ret < 0) { 1546 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1547 return ret; 1548 } 1549 /* Fallthrough on positive return values - already enabled */ 1550 } 1551 1552 rdev->use_count++; 1553 1554 return 0; 1555} 1556 1557/** 1558 * regulator_enable - enable regulator output 1559 * @regulator: regulator source 1560 * 1561 * Request that the regulator be enabled with the regulator output at 1562 * the predefined voltage or current value. Calls to regulator_enable() 1563 * must be balanced with calls to regulator_disable(). 1564 * 1565 * NOTE: the output value can be set by other drivers, boot loader or may be 1566 * hardwired in the regulator. 1567 */ 1568int regulator_enable(struct regulator *regulator) 1569{ 1570 struct regulator_dev *rdev = regulator->rdev; 1571 int ret = 0; 1572 1573 if (regulator->always_on) 1574 return 0; 1575 1576 if (rdev->supply) { 1577 ret = regulator_enable(rdev->supply); 1578 if (ret != 0) 1579 return ret; 1580 } 1581 1582 mutex_lock(&rdev->mutex); 1583 ret = _regulator_enable(rdev); 1584 mutex_unlock(&rdev->mutex); 1585 1586 if (ret != 0 && rdev->supply) 1587 regulator_disable(rdev->supply); 1588 1589 return ret; 1590} 1591EXPORT_SYMBOL_GPL(regulator_enable); 1592 1593static int _regulator_do_disable(struct regulator_dev *rdev) 1594{ 1595 int ret; 1596 1597 trace_regulator_disable(rdev_get_name(rdev)); 1598 1599 if (rdev->ena_gpio) { 1600 gpio_set_value_cansleep(rdev->ena_gpio, 1601 rdev->ena_gpio_invert); 1602 rdev->ena_gpio_state = 0; 1603 1604 } else if (rdev->desc->ops->disable) { 1605 ret = rdev->desc->ops->disable(rdev); 1606 if (ret != 0) 1607 return ret; 1608 } 1609 1610 trace_regulator_disable_complete(rdev_get_name(rdev)); 1611 1612 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1613 NULL); 1614 return 0; 1615} 1616 1617/* locks held by regulator_disable() */ 1618static int _regulator_disable(struct regulator_dev *rdev) 1619{ 1620 int ret = 0; 1621 1622 if (WARN(rdev->use_count <= 0, 1623 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1624 return -EIO; 1625 1626 /* are we the last user and permitted to disable ? */ 1627 if (rdev->use_count == 1 && 1628 (rdev->constraints && !rdev->constraints->always_on)) { 1629 1630 /* we are last user */ 1631 if (_regulator_can_change_status(rdev)) { 1632 ret = _regulator_do_disable(rdev); 1633 if (ret < 0) { 1634 rdev_err(rdev, "failed to disable\n"); 1635 return ret; 1636 } 1637 } 1638 1639 rdev->use_count = 0; 1640 } else if (rdev->use_count > 1) { 1641 1642 if (rdev->constraints && 1643 (rdev->constraints->valid_ops_mask & 1644 REGULATOR_CHANGE_DRMS)) 1645 drms_uA_update(rdev); 1646 1647 rdev->use_count--; 1648 } 1649 1650 return ret; 1651} 1652 1653/** 1654 * regulator_disable - disable regulator output 1655 * @regulator: regulator source 1656 * 1657 * Disable the regulator output voltage or current. Calls to 1658 * regulator_enable() must be balanced with calls to 1659 * regulator_disable(). 1660 * 1661 * NOTE: this will only disable the regulator output if no other consumer 1662 * devices have it enabled, the regulator device supports disabling and 1663 * machine constraints permit this operation. 1664 */ 1665int regulator_disable(struct regulator *regulator) 1666{ 1667 struct regulator_dev *rdev = regulator->rdev; 1668 int ret = 0; 1669 1670 if (regulator->always_on) 1671 return 0; 1672 1673 mutex_lock(&rdev->mutex); 1674 ret = _regulator_disable(rdev); 1675 mutex_unlock(&rdev->mutex); 1676 1677 if (ret == 0 && rdev->supply) 1678 regulator_disable(rdev->supply); 1679 1680 return ret; 1681} 1682EXPORT_SYMBOL_GPL(regulator_disable); 1683 1684/* locks held by regulator_force_disable() */ 1685static int _regulator_force_disable(struct regulator_dev *rdev) 1686{ 1687 int ret = 0; 1688 1689 /* force disable */ 1690 if (rdev->desc->ops->disable) { 1691 /* ah well, who wants to live forever... */ 1692 ret = rdev->desc->ops->disable(rdev); 1693 if (ret < 0) { 1694 rdev_err(rdev, "failed to force disable\n"); 1695 return ret; 1696 } 1697 /* notify other consumers that power has been forced off */ 1698 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1699 REGULATOR_EVENT_DISABLE, NULL); 1700 } 1701 1702 return ret; 1703} 1704 1705/** 1706 * regulator_force_disable - force disable regulator output 1707 * @regulator: regulator source 1708 * 1709 * Forcibly disable the regulator output voltage or current. 1710 * NOTE: this *will* disable the regulator output even if other consumer 1711 * devices have it enabled. This should be used for situations when device 1712 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1713 */ 1714int regulator_force_disable(struct regulator *regulator) 1715{ 1716 struct regulator_dev *rdev = regulator->rdev; 1717 int ret; 1718 1719 mutex_lock(&rdev->mutex); 1720 regulator->uA_load = 0; 1721 ret = _regulator_force_disable(regulator->rdev); 1722 mutex_unlock(&rdev->mutex); 1723 1724 if (rdev->supply) 1725 while (rdev->open_count--) 1726 regulator_disable(rdev->supply); 1727 1728 return ret; 1729} 1730EXPORT_SYMBOL_GPL(regulator_force_disable); 1731 1732static void regulator_disable_work(struct work_struct *work) 1733{ 1734 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1735 disable_work.work); 1736 int count, i, ret; 1737 1738 mutex_lock(&rdev->mutex); 1739 1740 BUG_ON(!rdev->deferred_disables); 1741 1742 count = rdev->deferred_disables; 1743 rdev->deferred_disables = 0; 1744 1745 for (i = 0; i < count; i++) { 1746 ret = _regulator_disable(rdev); 1747 if (ret != 0) 1748 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1749 } 1750 1751 mutex_unlock(&rdev->mutex); 1752 1753 if (rdev->supply) { 1754 for (i = 0; i < count; i++) { 1755 ret = regulator_disable(rdev->supply); 1756 if (ret != 0) { 1757 rdev_err(rdev, 1758 "Supply disable failed: %d\n", ret); 1759 } 1760 } 1761 } 1762} 1763 1764/** 1765 * regulator_disable_deferred - disable regulator output with delay 1766 * @regulator: regulator source 1767 * @ms: miliseconds until the regulator is disabled 1768 * 1769 * Execute regulator_disable() on the regulator after a delay. This 1770 * is intended for use with devices that require some time to quiesce. 1771 * 1772 * NOTE: this will only disable the regulator output if no other consumer 1773 * devices have it enabled, the regulator device supports disabling and 1774 * machine constraints permit this operation. 1775 */ 1776int regulator_disable_deferred(struct regulator *regulator, int ms) 1777{ 1778 struct regulator_dev *rdev = regulator->rdev; 1779 int ret; 1780 1781 if (regulator->always_on) 1782 return 0; 1783 1784 mutex_lock(&rdev->mutex); 1785 rdev->deferred_disables++; 1786 mutex_unlock(&rdev->mutex); 1787 1788 ret = schedule_delayed_work(&rdev->disable_work, 1789 msecs_to_jiffies(ms)); 1790 if (ret < 0) 1791 return ret; 1792 else 1793 return 0; 1794} 1795EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1796 1797/** 1798 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1799 * 1800 * @rdev: regulator to operate on 1801 * 1802 * Regulators that use regmap for their register I/O can set the 1803 * enable_reg and enable_mask fields in their descriptor and then use 1804 * this as their is_enabled operation, saving some code. 1805 */ 1806int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1807{ 1808 unsigned int val; 1809 int ret; 1810 1811 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1812 if (ret != 0) 1813 return ret; 1814 1815 return (val & rdev->desc->enable_mask) != 0; 1816} 1817EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1818 1819/** 1820 * regulator_enable_regmap - standard enable() for regmap users 1821 * 1822 * @rdev: regulator to operate on 1823 * 1824 * Regulators that use regmap for their register I/O can set the 1825 * enable_reg and enable_mask fields in their descriptor and then use 1826 * this as their enable() operation, saving some code. 1827 */ 1828int regulator_enable_regmap(struct regulator_dev *rdev) 1829{ 1830 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1831 rdev->desc->enable_mask, 1832 rdev->desc->enable_mask); 1833} 1834EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1835 1836/** 1837 * regulator_disable_regmap - standard disable() for regmap users 1838 * 1839 * @rdev: regulator to operate on 1840 * 1841 * Regulators that use regmap for their register I/O can set the 1842 * enable_reg and enable_mask fields in their descriptor and then use 1843 * this as their disable() operation, saving some code. 1844 */ 1845int regulator_disable_regmap(struct regulator_dev *rdev) 1846{ 1847 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1848 rdev->desc->enable_mask, 0); 1849} 1850EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1851 1852static int _regulator_is_enabled(struct regulator_dev *rdev) 1853{ 1854 /* A GPIO control always takes precedence */ 1855 if (rdev->ena_gpio) 1856 return rdev->ena_gpio_state; 1857 1858 /* If we don't know then assume that the regulator is always on */ 1859 if (!rdev->desc->ops->is_enabled) 1860 return 1; 1861 1862 return rdev->desc->ops->is_enabled(rdev); 1863} 1864 1865/** 1866 * regulator_is_enabled - is the regulator output enabled 1867 * @regulator: regulator source 1868 * 1869 * Returns positive if the regulator driver backing the source/client 1870 * has requested that the device be enabled, zero if it hasn't, else a 1871 * negative errno code. 1872 * 1873 * Note that the device backing this regulator handle can have multiple 1874 * users, so it might be enabled even if regulator_enable() was never 1875 * called for this particular source. 1876 */ 1877int regulator_is_enabled(struct regulator *regulator) 1878{ 1879 int ret; 1880 1881 if (regulator->always_on) 1882 return 1; 1883 1884 mutex_lock(®ulator->rdev->mutex); 1885 ret = _regulator_is_enabled(regulator->rdev); 1886 mutex_unlock(®ulator->rdev->mutex); 1887 1888 return ret; 1889} 1890EXPORT_SYMBOL_GPL(regulator_is_enabled); 1891 1892/** 1893 * regulator_count_voltages - count regulator_list_voltage() selectors 1894 * @regulator: regulator source 1895 * 1896 * Returns number of selectors, or negative errno. Selectors are 1897 * numbered starting at zero, and typically correspond to bitfields 1898 * in hardware registers. 1899 */ 1900int regulator_count_voltages(struct regulator *regulator) 1901{ 1902 struct regulator_dev *rdev = regulator->rdev; 1903 1904 return rdev->desc->n_voltages ? : -EINVAL; 1905} 1906EXPORT_SYMBOL_GPL(regulator_count_voltages); 1907 1908/** 1909 * regulator_list_voltage_linear - List voltages with simple calculation 1910 * 1911 * @rdev: Regulator device 1912 * @selector: Selector to convert into a voltage 1913 * 1914 * Regulators with a simple linear mapping between voltages and 1915 * selectors can set min_uV and uV_step in the regulator descriptor 1916 * and then use this function as their list_voltage() operation, 1917 */ 1918int regulator_list_voltage_linear(struct regulator_dev *rdev, 1919 unsigned int selector) 1920{ 1921 if (selector >= rdev->desc->n_voltages) 1922 return -EINVAL; 1923 1924 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1925} 1926EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1927 1928/** 1929 * regulator_list_voltage_table - List voltages with table based mapping 1930 * 1931 * @rdev: Regulator device 1932 * @selector: Selector to convert into a voltage 1933 * 1934 * Regulators with table based mapping between voltages and 1935 * selectors can set volt_table in the regulator descriptor 1936 * and then use this function as their list_voltage() operation. 1937 */ 1938int regulator_list_voltage_table(struct regulator_dev *rdev, 1939 unsigned int selector) 1940{ 1941 if (!rdev->desc->volt_table) { 1942 BUG_ON(!rdev->desc->volt_table); 1943 return -EINVAL; 1944 } 1945 1946 if (selector >= rdev->desc->n_voltages) 1947 return -EINVAL; 1948 1949 return rdev->desc->volt_table[selector]; 1950} 1951EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1952 1953/** 1954 * regulator_list_voltage - enumerate supported voltages 1955 * @regulator: regulator source 1956 * @selector: identify voltage to list 1957 * Context: can sleep 1958 * 1959 * Returns a voltage that can be passed to @regulator_set_voltage(), 1960 * zero if this selector code can't be used on this system, or a 1961 * negative errno. 1962 */ 1963int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1964{ 1965 struct regulator_dev *rdev = regulator->rdev; 1966 struct regulator_ops *ops = rdev->desc->ops; 1967 int ret; 1968 1969 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1970 return -EINVAL; 1971 1972 mutex_lock(&rdev->mutex); 1973 ret = ops->list_voltage(rdev, selector); 1974 mutex_unlock(&rdev->mutex); 1975 1976 if (ret > 0) { 1977 if (ret < rdev->constraints->min_uV) 1978 ret = 0; 1979 else if (ret > rdev->constraints->max_uV) 1980 ret = 0; 1981 } 1982 1983 return ret; 1984} 1985EXPORT_SYMBOL_GPL(regulator_list_voltage); 1986 1987/** 1988 * regulator_is_supported_voltage - check if a voltage range can be supported 1989 * 1990 * @regulator: Regulator to check. 1991 * @min_uV: Minimum required voltage in uV. 1992 * @max_uV: Maximum required voltage in uV. 1993 * 1994 * Returns a boolean or a negative error code. 1995 */ 1996int regulator_is_supported_voltage(struct regulator *regulator, 1997 int min_uV, int max_uV) 1998{ 1999 int i, voltages, ret; 2000 2001 ret = regulator_count_voltages(regulator); 2002 if (ret < 0) 2003 return ret; 2004 voltages = ret; 2005 2006 for (i = 0; i < voltages; i++) { 2007 ret = regulator_list_voltage(regulator, i); 2008 2009 if (ret >= min_uV && ret <= max_uV) 2010 return 1; 2011 } 2012 2013 return 0; 2014} 2015EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2016 2017/** 2018 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2019 * 2020 * @rdev: regulator to operate on 2021 * 2022 * Regulators that use regmap for their register I/O can set the 2023 * vsel_reg and vsel_mask fields in their descriptor and then use this 2024 * as their get_voltage_vsel operation, saving some code. 2025 */ 2026int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2027{ 2028 unsigned int val; 2029 int ret; 2030 2031 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2032 if (ret != 0) 2033 return ret; 2034 2035 val &= rdev->desc->vsel_mask; 2036 val >>= ffs(rdev->desc->vsel_mask) - 1; 2037 2038 return val; 2039} 2040EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2041 2042/** 2043 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2044 * 2045 * @rdev: regulator to operate on 2046 * @sel: Selector to set 2047 * 2048 * Regulators that use regmap for their register I/O can set the 2049 * vsel_reg and vsel_mask fields in their descriptor and then use this 2050 * as their set_voltage_vsel operation, saving some code. 2051 */ 2052int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2053{ 2054 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2055 2056 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2057 rdev->desc->vsel_mask, sel); 2058} 2059EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2060 2061/** 2062 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2063 * 2064 * @rdev: Regulator to operate on 2065 * @min_uV: Lower bound for voltage 2066 * @max_uV: Upper bound for voltage 2067 * 2068 * Drivers implementing set_voltage_sel() and list_voltage() can use 2069 * this as their map_voltage() operation. It will find a suitable 2070 * voltage by calling list_voltage() until it gets something in bounds 2071 * for the requested voltages. 2072 */ 2073int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2074 int min_uV, int max_uV) 2075{ 2076 int best_val = INT_MAX; 2077 int selector = 0; 2078 int i, ret; 2079 2080 /* Find the smallest voltage that falls within the specified 2081 * range. 2082 */ 2083 for (i = 0; i < rdev->desc->n_voltages; i++) { 2084 ret = rdev->desc->ops->list_voltage(rdev, i); 2085 if (ret < 0) 2086 continue; 2087 2088 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2089 best_val = ret; 2090 selector = i; 2091 } 2092 } 2093 2094 if (best_val != INT_MAX) 2095 return selector; 2096 else 2097 return -EINVAL; 2098} 2099EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2100 2101/** 2102 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2103 * 2104 * @rdev: Regulator to operate on 2105 * @min_uV: Lower bound for voltage 2106 * @max_uV: Upper bound for voltage 2107 * 2108 * Drivers providing min_uV and uV_step in their regulator_desc can 2109 * use this as their map_voltage() operation. 2110 */ 2111int regulator_map_voltage_linear(struct regulator_dev *rdev, 2112 int min_uV, int max_uV) 2113{ 2114 int ret, voltage; 2115 2116 /* Allow uV_step to be 0 for fixed voltage */ 2117 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2118 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2119 return 0; 2120 else 2121 return -EINVAL; 2122 } 2123 2124 if (!rdev->desc->uV_step) { 2125 BUG_ON(!rdev->desc->uV_step); 2126 return -EINVAL; 2127 } 2128 2129 if (min_uV < rdev->desc->min_uV) 2130 min_uV = rdev->desc->min_uV; 2131 2132 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2133 if (ret < 0) 2134 return ret; 2135 2136 /* Map back into a voltage to verify we're still in bounds */ 2137 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2138 if (voltage < min_uV || voltage > max_uV) 2139 return -EINVAL; 2140 2141 return ret; 2142} 2143EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2144 2145static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2146 int min_uV, int max_uV) 2147{ 2148 int ret; 2149 int delay = 0; 2150 int best_val; 2151 unsigned int selector; 2152 int old_selector = -1; 2153 2154 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2155 2156 min_uV += rdev->constraints->uV_offset; 2157 max_uV += rdev->constraints->uV_offset; 2158 2159 /* 2160 * If we can't obtain the old selector there is not enough 2161 * info to call set_voltage_time_sel(). 2162 */ 2163 if (_regulator_is_enabled(rdev) && 2164 rdev->desc->ops->set_voltage_time_sel && 2165 rdev->desc->ops->get_voltage_sel) { 2166 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2167 if (old_selector < 0) 2168 return old_selector; 2169 } 2170 2171 if (rdev->desc->ops->set_voltage) { 2172 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2173 &selector); 2174 } else if (rdev->desc->ops->set_voltage_sel) { 2175 if (rdev->desc->ops->map_voltage) 2176 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2177 max_uV); 2178 else 2179 ret = regulator_map_voltage_iterate(rdev, min_uV, 2180 max_uV); 2181 2182 if (ret >= 0) { 2183 selector = ret; 2184 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2185 } 2186 } else { 2187 ret = -EINVAL; 2188 } 2189 2190 if (rdev->desc->ops->list_voltage) 2191 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2192 else 2193 best_val = -1; 2194 2195 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2196 if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 && 2197 rdev->desc->ops->set_voltage_time_sel) { 2198 2199 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2200 old_selector, selector); 2201 if (delay < 0) { 2202 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2203 delay); 2204 delay = 0; 2205 } 2206 } 2207 2208 /* Insert any necessary delays */ 2209 if (delay >= 1000) { 2210 mdelay(delay / 1000); 2211 udelay(delay % 1000); 2212 } else if (delay) { 2213 udelay(delay); 2214 } 2215 2216 if (ret == 0) 2217 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2218 NULL); 2219 2220 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2221 2222 return ret; 2223} 2224 2225/** 2226 * regulator_set_voltage - set regulator output voltage 2227 * @regulator: regulator source 2228 * @min_uV: Minimum required voltage in uV 2229 * @max_uV: Maximum acceptable voltage in uV 2230 * 2231 * Sets a voltage regulator to the desired output voltage. This can be set 2232 * during any regulator state. IOW, regulator can be disabled or enabled. 2233 * 2234 * If the regulator is enabled then the voltage will change to the new value 2235 * immediately otherwise if the regulator is disabled the regulator will 2236 * output at the new voltage when enabled. 2237 * 2238 * NOTE: If the regulator is shared between several devices then the lowest 2239 * request voltage that meets the system constraints will be used. 2240 * Regulator system constraints must be set for this regulator before 2241 * calling this function otherwise this call will fail. 2242 */ 2243int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2244{ 2245 struct regulator_dev *rdev = regulator->rdev; 2246 int ret = 0; 2247 2248 mutex_lock(&rdev->mutex); 2249 2250 /* If we're setting the same range as last time the change 2251 * should be a noop (some cpufreq implementations use the same 2252 * voltage for multiple frequencies, for example). 2253 */ 2254 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2255 goto out; 2256 2257 /* sanity check */ 2258 if (!rdev->desc->ops->set_voltage && 2259 !rdev->desc->ops->set_voltage_sel) { 2260 ret = -EINVAL; 2261 goto out; 2262 } 2263 2264 /* constraints check */ 2265 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2266 if (ret < 0) 2267 goto out; 2268 regulator->min_uV = min_uV; 2269 regulator->max_uV = max_uV; 2270 2271 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2272 if (ret < 0) 2273 goto out; 2274 2275 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2276 2277out: 2278 mutex_unlock(&rdev->mutex); 2279 return ret; 2280} 2281EXPORT_SYMBOL_GPL(regulator_set_voltage); 2282 2283/** 2284 * regulator_set_voltage_time - get raise/fall time 2285 * @regulator: regulator source 2286 * @old_uV: starting voltage in microvolts 2287 * @new_uV: target voltage in microvolts 2288 * 2289 * Provided with the starting and ending voltage, this function attempts to 2290 * calculate the time in microseconds required to rise or fall to this new 2291 * voltage. 2292 */ 2293int regulator_set_voltage_time(struct regulator *regulator, 2294 int old_uV, int new_uV) 2295{ 2296 struct regulator_dev *rdev = regulator->rdev; 2297 struct regulator_ops *ops = rdev->desc->ops; 2298 int old_sel = -1; 2299 int new_sel = -1; 2300 int voltage; 2301 int i; 2302 2303 /* Currently requires operations to do this */ 2304 if (!ops->list_voltage || !ops->set_voltage_time_sel 2305 || !rdev->desc->n_voltages) 2306 return -EINVAL; 2307 2308 for (i = 0; i < rdev->desc->n_voltages; i++) { 2309 /* We only look for exact voltage matches here */ 2310 voltage = regulator_list_voltage(regulator, i); 2311 if (voltage < 0) 2312 return -EINVAL; 2313 if (voltage == 0) 2314 continue; 2315 if (voltage == old_uV) 2316 old_sel = i; 2317 if (voltage == new_uV) 2318 new_sel = i; 2319 } 2320 2321 if (old_sel < 0 || new_sel < 0) 2322 return -EINVAL; 2323 2324 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2325} 2326EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2327 2328/** 2329 *regulator_set_voltage_time_sel - get raise/fall time 2330 * @regulator: regulator source 2331 * @old_selector: selector for starting voltage 2332 * @new_selector: selector for target voltage 2333 * 2334 * Provided with the starting and target voltage selectors, this function 2335 * returns time in microseconds required to rise or fall to this new voltage 2336 * 2337 * Drivers providing ramp_delay in regulation_constraints can use this as their 2338 * set_voltage_time_sel() operation. 2339 */ 2340int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2341 unsigned int old_selector, 2342 unsigned int new_selector) 2343{ 2344 unsigned int ramp_delay = 0; 2345 int old_volt, new_volt; 2346 2347 if (rdev->constraints->ramp_delay) 2348 ramp_delay = rdev->constraints->ramp_delay; 2349 else if (rdev->desc->ramp_delay) 2350 ramp_delay = rdev->desc->ramp_delay; 2351 2352 if (ramp_delay == 0) { 2353 rdev_warn(rdev, "ramp_delay not set\n"); 2354 return 0; 2355 } 2356 2357 /* sanity check */ 2358 if (!rdev->desc->ops->list_voltage) 2359 return -EINVAL; 2360 2361 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2362 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2363 2364 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2365} 2366EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2367 2368/** 2369 * regulator_sync_voltage - re-apply last regulator output voltage 2370 * @regulator: regulator source 2371 * 2372 * Re-apply the last configured voltage. This is intended to be used 2373 * where some external control source the consumer is cooperating with 2374 * has caused the configured voltage to change. 2375 */ 2376int regulator_sync_voltage(struct regulator *regulator) 2377{ 2378 struct regulator_dev *rdev = regulator->rdev; 2379 int ret, min_uV, max_uV; 2380 2381 mutex_lock(&rdev->mutex); 2382 2383 if (!rdev->desc->ops->set_voltage && 2384 !rdev->desc->ops->set_voltage_sel) { 2385 ret = -EINVAL; 2386 goto out; 2387 } 2388 2389 /* This is only going to work if we've had a voltage configured. */ 2390 if (!regulator->min_uV && !regulator->max_uV) { 2391 ret = -EINVAL; 2392 goto out; 2393 } 2394 2395 min_uV = regulator->min_uV; 2396 max_uV = regulator->max_uV; 2397 2398 /* This should be a paranoia check... */ 2399 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2400 if (ret < 0) 2401 goto out; 2402 2403 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2404 if (ret < 0) 2405 goto out; 2406 2407 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2408 2409out: 2410 mutex_unlock(&rdev->mutex); 2411 return ret; 2412} 2413EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2414 2415static int _regulator_get_voltage(struct regulator_dev *rdev) 2416{ 2417 int sel, ret; 2418 2419 if (rdev->desc->ops->get_voltage_sel) { 2420 sel = rdev->desc->ops->get_voltage_sel(rdev); 2421 if (sel < 0) 2422 return sel; 2423 ret = rdev->desc->ops->list_voltage(rdev, sel); 2424 } else if (rdev->desc->ops->get_voltage) { 2425 ret = rdev->desc->ops->get_voltage(rdev); 2426 } else { 2427 return -EINVAL; 2428 } 2429 2430 if (ret < 0) 2431 return ret; 2432 return ret - rdev->constraints->uV_offset; 2433} 2434 2435/** 2436 * regulator_get_voltage - get regulator output voltage 2437 * @regulator: regulator source 2438 * 2439 * This returns the current regulator voltage in uV. 2440 * 2441 * NOTE: If the regulator is disabled it will return the voltage value. This 2442 * function should not be used to determine regulator state. 2443 */ 2444int regulator_get_voltage(struct regulator *regulator) 2445{ 2446 int ret; 2447 2448 mutex_lock(®ulator->rdev->mutex); 2449 2450 ret = _regulator_get_voltage(regulator->rdev); 2451 2452 mutex_unlock(®ulator->rdev->mutex); 2453 2454 return ret; 2455} 2456EXPORT_SYMBOL_GPL(regulator_get_voltage); 2457 2458/** 2459 * regulator_set_current_limit - set regulator output current limit 2460 * @regulator: regulator source 2461 * @min_uA: Minimuum supported current in uA 2462 * @max_uA: Maximum supported current in uA 2463 * 2464 * Sets current sink to the desired output current. This can be set during 2465 * any regulator state. IOW, regulator can be disabled or enabled. 2466 * 2467 * If the regulator is enabled then the current will change to the new value 2468 * immediately otherwise if the regulator is disabled the regulator will 2469 * output at the new current when enabled. 2470 * 2471 * NOTE: Regulator system constraints must be set for this regulator before 2472 * calling this function otherwise this call will fail. 2473 */ 2474int regulator_set_current_limit(struct regulator *regulator, 2475 int min_uA, int max_uA) 2476{ 2477 struct regulator_dev *rdev = regulator->rdev; 2478 int ret; 2479 2480 mutex_lock(&rdev->mutex); 2481 2482 /* sanity check */ 2483 if (!rdev->desc->ops->set_current_limit) { 2484 ret = -EINVAL; 2485 goto out; 2486 } 2487 2488 /* constraints check */ 2489 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2490 if (ret < 0) 2491 goto out; 2492 2493 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2494out: 2495 mutex_unlock(&rdev->mutex); 2496 return ret; 2497} 2498EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2499 2500static int _regulator_get_current_limit(struct regulator_dev *rdev) 2501{ 2502 int ret; 2503 2504 mutex_lock(&rdev->mutex); 2505 2506 /* sanity check */ 2507 if (!rdev->desc->ops->get_current_limit) { 2508 ret = -EINVAL; 2509 goto out; 2510 } 2511 2512 ret = rdev->desc->ops->get_current_limit(rdev); 2513out: 2514 mutex_unlock(&rdev->mutex); 2515 return ret; 2516} 2517 2518/** 2519 * regulator_get_current_limit - get regulator output current 2520 * @regulator: regulator source 2521 * 2522 * This returns the current supplied by the specified current sink in uA. 2523 * 2524 * NOTE: If the regulator is disabled it will return the current value. This 2525 * function should not be used to determine regulator state. 2526 */ 2527int regulator_get_current_limit(struct regulator *regulator) 2528{ 2529 return _regulator_get_current_limit(regulator->rdev); 2530} 2531EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2532 2533/** 2534 * regulator_set_mode - set regulator operating mode 2535 * @regulator: regulator source 2536 * @mode: operating mode - one of the REGULATOR_MODE constants 2537 * 2538 * Set regulator operating mode to increase regulator efficiency or improve 2539 * regulation performance. 2540 * 2541 * NOTE: Regulator system constraints must be set for this regulator before 2542 * calling this function otherwise this call will fail. 2543 */ 2544int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2545{ 2546 struct regulator_dev *rdev = regulator->rdev; 2547 int ret; 2548 int regulator_curr_mode; 2549 2550 mutex_lock(&rdev->mutex); 2551 2552 /* sanity check */ 2553 if (!rdev->desc->ops->set_mode) { 2554 ret = -EINVAL; 2555 goto out; 2556 } 2557 2558 /* return if the same mode is requested */ 2559 if (rdev->desc->ops->get_mode) { 2560 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2561 if (regulator_curr_mode == mode) { 2562 ret = 0; 2563 goto out; 2564 } 2565 } 2566 2567 /* constraints check */ 2568 ret = regulator_mode_constrain(rdev, &mode); 2569 if (ret < 0) 2570 goto out; 2571 2572 ret = rdev->desc->ops->set_mode(rdev, mode); 2573out: 2574 mutex_unlock(&rdev->mutex); 2575 return ret; 2576} 2577EXPORT_SYMBOL_GPL(regulator_set_mode); 2578 2579static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2580{ 2581 int ret; 2582 2583 mutex_lock(&rdev->mutex); 2584 2585 /* sanity check */ 2586 if (!rdev->desc->ops->get_mode) { 2587 ret = -EINVAL; 2588 goto out; 2589 } 2590 2591 ret = rdev->desc->ops->get_mode(rdev); 2592out: 2593 mutex_unlock(&rdev->mutex); 2594 return ret; 2595} 2596 2597/** 2598 * regulator_get_mode - get regulator operating mode 2599 * @regulator: regulator source 2600 * 2601 * Get the current regulator operating mode. 2602 */ 2603unsigned int regulator_get_mode(struct regulator *regulator) 2604{ 2605 return _regulator_get_mode(regulator->rdev); 2606} 2607EXPORT_SYMBOL_GPL(regulator_get_mode); 2608 2609/** 2610 * regulator_set_optimum_mode - set regulator optimum operating mode 2611 * @regulator: regulator source 2612 * @uA_load: load current 2613 * 2614 * Notifies the regulator core of a new device load. This is then used by 2615 * DRMS (if enabled by constraints) to set the most efficient regulator 2616 * operating mode for the new regulator loading. 2617 * 2618 * Consumer devices notify their supply regulator of the maximum power 2619 * they will require (can be taken from device datasheet in the power 2620 * consumption tables) when they change operational status and hence power 2621 * state. Examples of operational state changes that can affect power 2622 * consumption are :- 2623 * 2624 * o Device is opened / closed. 2625 * o Device I/O is about to begin or has just finished. 2626 * o Device is idling in between work. 2627 * 2628 * This information is also exported via sysfs to userspace. 2629 * 2630 * DRMS will sum the total requested load on the regulator and change 2631 * to the most efficient operating mode if platform constraints allow. 2632 * 2633 * Returns the new regulator mode or error. 2634 */ 2635int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2636{ 2637 struct regulator_dev *rdev = regulator->rdev; 2638 struct regulator *consumer; 2639 int ret, output_uV, input_uV, total_uA_load = 0; 2640 unsigned int mode; 2641 2642 mutex_lock(&rdev->mutex); 2643 2644 /* 2645 * first check to see if we can set modes at all, otherwise just 2646 * tell the consumer everything is OK. 2647 */ 2648 regulator->uA_load = uA_load; 2649 ret = regulator_check_drms(rdev); 2650 if (ret < 0) { 2651 ret = 0; 2652 goto out; 2653 } 2654 2655 if (!rdev->desc->ops->get_optimum_mode) 2656 goto out; 2657 2658 /* 2659 * we can actually do this so any errors are indicators of 2660 * potential real failure. 2661 */ 2662 ret = -EINVAL; 2663 2664 if (!rdev->desc->ops->set_mode) 2665 goto out; 2666 2667 /* get output voltage */ 2668 output_uV = _regulator_get_voltage(rdev); 2669 if (output_uV <= 0) { 2670 rdev_err(rdev, "invalid output voltage found\n"); 2671 goto out; 2672 } 2673 2674 /* get input voltage */ 2675 input_uV = 0; 2676 if (rdev->supply) 2677 input_uV = regulator_get_voltage(rdev->supply); 2678 if (input_uV <= 0) 2679 input_uV = rdev->constraints->input_uV; 2680 if (input_uV <= 0) { 2681 rdev_err(rdev, "invalid input voltage found\n"); 2682 goto out; 2683 } 2684 2685 /* calc total requested load for this regulator */ 2686 list_for_each_entry(consumer, &rdev->consumer_list, list) 2687 total_uA_load += consumer->uA_load; 2688 2689 mode = rdev->desc->ops->get_optimum_mode(rdev, 2690 input_uV, output_uV, 2691 total_uA_load); 2692 ret = regulator_mode_constrain(rdev, &mode); 2693 if (ret < 0) { 2694 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2695 total_uA_load, input_uV, output_uV); 2696 goto out; 2697 } 2698 2699 ret = rdev->desc->ops->set_mode(rdev, mode); 2700 if (ret < 0) { 2701 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2702 goto out; 2703 } 2704 ret = mode; 2705out: 2706 mutex_unlock(&rdev->mutex); 2707 return ret; 2708} 2709EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2710 2711/** 2712 * regulator_register_notifier - register regulator event notifier 2713 * @regulator: regulator source 2714 * @nb: notifier block 2715 * 2716 * Register notifier block to receive regulator events. 2717 */ 2718int regulator_register_notifier(struct regulator *regulator, 2719 struct notifier_block *nb) 2720{ 2721 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2722 nb); 2723} 2724EXPORT_SYMBOL_GPL(regulator_register_notifier); 2725 2726/** 2727 * regulator_unregister_notifier - unregister regulator event notifier 2728 * @regulator: regulator source 2729 * @nb: notifier block 2730 * 2731 * Unregister regulator event notifier block. 2732 */ 2733int regulator_unregister_notifier(struct regulator *regulator, 2734 struct notifier_block *nb) 2735{ 2736 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2737 nb); 2738} 2739EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2740 2741/* notify regulator consumers and downstream regulator consumers. 2742 * Note mutex must be held by caller. 2743 */ 2744static void _notifier_call_chain(struct regulator_dev *rdev, 2745 unsigned long event, void *data) 2746{ 2747 /* call rdev chain first */ 2748 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2749} 2750 2751/** 2752 * regulator_bulk_get - get multiple regulator consumers 2753 * 2754 * @dev: Device to supply 2755 * @num_consumers: Number of consumers to register 2756 * @consumers: Configuration of consumers; clients are stored here. 2757 * 2758 * @return 0 on success, an errno on failure. 2759 * 2760 * This helper function allows drivers to get several regulator 2761 * consumers in one operation. If any of the regulators cannot be 2762 * acquired then any regulators that were allocated will be freed 2763 * before returning to the caller. 2764 */ 2765int regulator_bulk_get(struct device *dev, int num_consumers, 2766 struct regulator_bulk_data *consumers) 2767{ 2768 int i; 2769 int ret; 2770 2771 for (i = 0; i < num_consumers; i++) 2772 consumers[i].consumer = NULL; 2773 2774 for (i = 0; i < num_consumers; i++) { 2775 consumers[i].consumer = regulator_get(dev, 2776 consumers[i].supply); 2777 if (IS_ERR(consumers[i].consumer)) { 2778 ret = PTR_ERR(consumers[i].consumer); 2779 dev_err(dev, "Failed to get supply '%s': %d\n", 2780 consumers[i].supply, ret); 2781 consumers[i].consumer = NULL; 2782 goto err; 2783 } 2784 } 2785 2786 return 0; 2787 2788err: 2789 while (--i >= 0) 2790 regulator_put(consumers[i].consumer); 2791 2792 return ret; 2793} 2794EXPORT_SYMBOL_GPL(regulator_bulk_get); 2795 2796/** 2797 * devm_regulator_bulk_get - managed get multiple regulator consumers 2798 * 2799 * @dev: Device to supply 2800 * @num_consumers: Number of consumers to register 2801 * @consumers: Configuration of consumers; clients are stored here. 2802 * 2803 * @return 0 on success, an errno on failure. 2804 * 2805 * This helper function allows drivers to get several regulator 2806 * consumers in one operation with management, the regulators will 2807 * automatically be freed when the device is unbound. If any of the 2808 * regulators cannot be acquired then any regulators that were 2809 * allocated will be freed before returning to the caller. 2810 */ 2811int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2812 struct regulator_bulk_data *consumers) 2813{ 2814 int i; 2815 int ret; 2816 2817 for (i = 0; i < num_consumers; i++) 2818 consumers[i].consumer = NULL; 2819 2820 for (i = 0; i < num_consumers; i++) { 2821 consumers[i].consumer = devm_regulator_get(dev, 2822 consumers[i].supply); 2823 if (IS_ERR(consumers[i].consumer)) { 2824 ret = PTR_ERR(consumers[i].consumer); 2825 dev_err(dev, "Failed to get supply '%s': %d\n", 2826 consumers[i].supply, ret); 2827 consumers[i].consumer = NULL; 2828 goto err; 2829 } 2830 } 2831 2832 return 0; 2833 2834err: 2835 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2836 devm_regulator_put(consumers[i].consumer); 2837 2838 return ret; 2839} 2840EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2841 2842static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2843{ 2844 struct regulator_bulk_data *bulk = data; 2845 2846 bulk->ret = regulator_enable(bulk->consumer); 2847} 2848 2849/** 2850 * regulator_bulk_enable - enable multiple regulator consumers 2851 * 2852 * @num_consumers: Number of consumers 2853 * @consumers: Consumer data; clients are stored here. 2854 * @return 0 on success, an errno on failure 2855 * 2856 * This convenience API allows consumers to enable multiple regulator 2857 * clients in a single API call. If any consumers cannot be enabled 2858 * then any others that were enabled will be disabled again prior to 2859 * return. 2860 */ 2861int regulator_bulk_enable(int num_consumers, 2862 struct regulator_bulk_data *consumers) 2863{ 2864 LIST_HEAD(async_domain); 2865 int i; 2866 int ret = 0; 2867 2868 for (i = 0; i < num_consumers; i++) { 2869 if (consumers[i].consumer->always_on) 2870 consumers[i].ret = 0; 2871 else 2872 async_schedule_domain(regulator_bulk_enable_async, 2873 &consumers[i], &async_domain); 2874 } 2875 2876 async_synchronize_full_domain(&async_domain); 2877 2878 /* If any consumer failed we need to unwind any that succeeded */ 2879 for (i = 0; i < num_consumers; i++) { 2880 if (consumers[i].ret != 0) { 2881 ret = consumers[i].ret; 2882 goto err; 2883 } 2884 } 2885 2886 return 0; 2887 2888err: 2889 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2890 while (--i >= 0) 2891 regulator_disable(consumers[i].consumer); 2892 2893 return ret; 2894} 2895EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2896 2897/** 2898 * regulator_bulk_disable - disable multiple regulator consumers 2899 * 2900 * @num_consumers: Number of consumers 2901 * @consumers: Consumer data; clients are stored here. 2902 * @return 0 on success, an errno on failure 2903 * 2904 * This convenience API allows consumers to disable multiple regulator 2905 * clients in a single API call. If any consumers cannot be disabled 2906 * then any others that were disabled will be enabled again prior to 2907 * return. 2908 */ 2909int regulator_bulk_disable(int num_consumers, 2910 struct regulator_bulk_data *consumers) 2911{ 2912 int i; 2913 int ret, r; 2914 2915 for (i = num_consumers - 1; i >= 0; --i) { 2916 ret = regulator_disable(consumers[i].consumer); 2917 if (ret != 0) 2918 goto err; 2919 } 2920 2921 return 0; 2922 2923err: 2924 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2925 for (++i; i < num_consumers; ++i) { 2926 r = regulator_enable(consumers[i].consumer); 2927 if (r != 0) 2928 pr_err("Failed to reename %s: %d\n", 2929 consumers[i].supply, r); 2930 } 2931 2932 return ret; 2933} 2934EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2935 2936/** 2937 * regulator_bulk_force_disable - force disable multiple regulator consumers 2938 * 2939 * @num_consumers: Number of consumers 2940 * @consumers: Consumer data; clients are stored here. 2941 * @return 0 on success, an errno on failure 2942 * 2943 * This convenience API allows consumers to forcibly disable multiple regulator 2944 * clients in a single API call. 2945 * NOTE: This should be used for situations when device damage will 2946 * likely occur if the regulators are not disabled (e.g. over temp). 2947 * Although regulator_force_disable function call for some consumers can 2948 * return error numbers, the function is called for all consumers. 2949 */ 2950int regulator_bulk_force_disable(int num_consumers, 2951 struct regulator_bulk_data *consumers) 2952{ 2953 int i; 2954 int ret; 2955 2956 for (i = 0; i < num_consumers; i++) 2957 consumers[i].ret = 2958 regulator_force_disable(consumers[i].consumer); 2959 2960 for (i = 0; i < num_consumers; i++) { 2961 if (consumers[i].ret != 0) { 2962 ret = consumers[i].ret; 2963 goto out; 2964 } 2965 } 2966 2967 return 0; 2968out: 2969 return ret; 2970} 2971EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2972 2973/** 2974 * regulator_bulk_free - free multiple regulator consumers 2975 * 2976 * @num_consumers: Number of consumers 2977 * @consumers: Consumer data; clients are stored here. 2978 * 2979 * This convenience API allows consumers to free multiple regulator 2980 * clients in a single API call. 2981 */ 2982void regulator_bulk_free(int num_consumers, 2983 struct regulator_bulk_data *consumers) 2984{ 2985 int i; 2986 2987 for (i = 0; i < num_consumers; i++) { 2988 regulator_put(consumers[i].consumer); 2989 consumers[i].consumer = NULL; 2990 } 2991} 2992EXPORT_SYMBOL_GPL(regulator_bulk_free); 2993 2994/** 2995 * regulator_notifier_call_chain - call regulator event notifier 2996 * @rdev: regulator source 2997 * @event: notifier block 2998 * @data: callback-specific data. 2999 * 3000 * Called by regulator drivers to notify clients a regulator event has 3001 * occurred. We also notify regulator clients downstream. 3002 * Note lock must be held by caller. 3003 */ 3004int regulator_notifier_call_chain(struct regulator_dev *rdev, 3005 unsigned long event, void *data) 3006{ 3007 _notifier_call_chain(rdev, event, data); 3008 return NOTIFY_DONE; 3009 3010} 3011EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3012 3013/** 3014 * regulator_mode_to_status - convert a regulator mode into a status 3015 * 3016 * @mode: Mode to convert 3017 * 3018 * Convert a regulator mode into a status. 3019 */ 3020int regulator_mode_to_status(unsigned int mode) 3021{ 3022 switch (mode) { 3023 case REGULATOR_MODE_FAST: 3024 return REGULATOR_STATUS_FAST; 3025 case REGULATOR_MODE_NORMAL: 3026 return REGULATOR_STATUS_NORMAL; 3027 case REGULATOR_MODE_IDLE: 3028 return REGULATOR_STATUS_IDLE; 3029 case REGULATOR_STATUS_STANDBY: 3030 return REGULATOR_STATUS_STANDBY; 3031 default: 3032 return 0; 3033 } 3034} 3035EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3036 3037/* 3038 * To avoid cluttering sysfs (and memory) with useless state, only 3039 * create attributes that can be meaningfully displayed. 3040 */ 3041static int add_regulator_attributes(struct regulator_dev *rdev) 3042{ 3043 struct device *dev = &rdev->dev; 3044 struct regulator_ops *ops = rdev->desc->ops; 3045 int status = 0; 3046 3047 /* some attributes need specific methods to be displayed */ 3048 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3049 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 3050 status = device_create_file(dev, &dev_attr_microvolts); 3051 if (status < 0) 3052 return status; 3053 } 3054 if (ops->get_current_limit) { 3055 status = device_create_file(dev, &dev_attr_microamps); 3056 if (status < 0) 3057 return status; 3058 } 3059 if (ops->get_mode) { 3060 status = device_create_file(dev, &dev_attr_opmode); 3061 if (status < 0) 3062 return status; 3063 } 3064 if (ops->is_enabled) { 3065 status = device_create_file(dev, &dev_attr_state); 3066 if (status < 0) 3067 return status; 3068 } 3069 if (ops->get_status) { 3070 status = device_create_file(dev, &dev_attr_status); 3071 if (status < 0) 3072 return status; 3073 } 3074 3075 /* some attributes are type-specific */ 3076 if (rdev->desc->type == REGULATOR_CURRENT) { 3077 status = device_create_file(dev, &dev_attr_requested_microamps); 3078 if (status < 0) 3079 return status; 3080 } 3081 3082 /* all the other attributes exist to support constraints; 3083 * don't show them if there are no constraints, or if the 3084 * relevant supporting methods are missing. 3085 */ 3086 if (!rdev->constraints) 3087 return status; 3088 3089 /* constraints need specific supporting methods */ 3090 if (ops->set_voltage || ops->set_voltage_sel) { 3091 status = device_create_file(dev, &dev_attr_min_microvolts); 3092 if (status < 0) 3093 return status; 3094 status = device_create_file(dev, &dev_attr_max_microvolts); 3095 if (status < 0) 3096 return status; 3097 } 3098 if (ops->set_current_limit) { 3099 status = device_create_file(dev, &dev_attr_min_microamps); 3100 if (status < 0) 3101 return status; 3102 status = device_create_file(dev, &dev_attr_max_microamps); 3103 if (status < 0) 3104 return status; 3105 } 3106 3107 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3108 if (status < 0) 3109 return status; 3110 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3111 if (status < 0) 3112 return status; 3113 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3114 if (status < 0) 3115 return status; 3116 3117 if (ops->set_suspend_voltage) { 3118 status = device_create_file(dev, 3119 &dev_attr_suspend_standby_microvolts); 3120 if (status < 0) 3121 return status; 3122 status = device_create_file(dev, 3123 &dev_attr_suspend_mem_microvolts); 3124 if (status < 0) 3125 return status; 3126 status = device_create_file(dev, 3127 &dev_attr_suspend_disk_microvolts); 3128 if (status < 0) 3129 return status; 3130 } 3131 3132 if (ops->set_suspend_mode) { 3133 status = device_create_file(dev, 3134 &dev_attr_suspend_standby_mode); 3135 if (status < 0) 3136 return status; 3137 status = device_create_file(dev, 3138 &dev_attr_suspend_mem_mode); 3139 if (status < 0) 3140 return status; 3141 status = device_create_file(dev, 3142 &dev_attr_suspend_disk_mode); 3143 if (status < 0) 3144 return status; 3145 } 3146 3147 return status; 3148} 3149 3150static void rdev_init_debugfs(struct regulator_dev *rdev) 3151{ 3152 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3153 if (!rdev->debugfs) { 3154 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3155 return; 3156 } 3157 3158 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3159 &rdev->use_count); 3160 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3161 &rdev->open_count); 3162} 3163 3164/** 3165 * regulator_register - register regulator 3166 * @regulator_desc: regulator to register 3167 * @config: runtime configuration for regulator 3168 * 3169 * Called by regulator drivers to register a regulator. 3170 * Returns 0 on success. 3171 */ 3172struct regulator_dev * 3173regulator_register(const struct regulator_desc *regulator_desc, 3174 const struct regulator_config *config) 3175{ 3176 const struct regulation_constraints *constraints = NULL; 3177 const struct regulator_init_data *init_data; 3178 static atomic_t regulator_no = ATOMIC_INIT(0); 3179 struct regulator_dev *rdev; 3180 struct device *dev; 3181 int ret, i; 3182 const char *supply = NULL; 3183 3184 if (regulator_desc == NULL || config == NULL) 3185 return ERR_PTR(-EINVAL); 3186 3187 dev = config->dev; 3188 WARN_ON(!dev); 3189 3190 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3191 return ERR_PTR(-EINVAL); 3192 3193 if (regulator_desc->type != REGULATOR_VOLTAGE && 3194 regulator_desc->type != REGULATOR_CURRENT) 3195 return ERR_PTR(-EINVAL); 3196 3197 /* Only one of each should be implemented */ 3198 WARN_ON(regulator_desc->ops->get_voltage && 3199 regulator_desc->ops->get_voltage_sel); 3200 WARN_ON(regulator_desc->ops->set_voltage && 3201 regulator_desc->ops->set_voltage_sel); 3202 3203 /* If we're using selectors we must implement list_voltage. */ 3204 if (regulator_desc->ops->get_voltage_sel && 3205 !regulator_desc->ops->list_voltage) { 3206 return ERR_PTR(-EINVAL); 3207 } 3208 if (regulator_desc->ops->set_voltage_sel && 3209 !regulator_desc->ops->list_voltage) { 3210 return ERR_PTR(-EINVAL); 3211 } 3212 3213 init_data = config->init_data; 3214 3215 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3216 if (rdev == NULL) 3217 return ERR_PTR(-ENOMEM); 3218 3219 mutex_lock(®ulator_list_mutex); 3220 3221 mutex_init(&rdev->mutex); 3222 rdev->reg_data = config->driver_data; 3223 rdev->owner = regulator_desc->owner; 3224 rdev->desc = regulator_desc; 3225 if (config->regmap) 3226 rdev->regmap = config->regmap; 3227 else 3228 rdev->regmap = dev_get_regmap(dev, NULL); 3229 INIT_LIST_HEAD(&rdev->consumer_list); 3230 INIT_LIST_HEAD(&rdev->list); 3231 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3232 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3233 3234 /* preform any regulator specific init */ 3235 if (init_data && init_data->regulator_init) { 3236 ret = init_data->regulator_init(rdev->reg_data); 3237 if (ret < 0) 3238 goto clean; 3239 } 3240 3241 /* register with sysfs */ 3242 rdev->dev.class = ®ulator_class; 3243 rdev->dev.of_node = config->of_node; 3244 rdev->dev.parent = dev; 3245 dev_set_name(&rdev->dev, "regulator.%d", 3246 atomic_inc_return(®ulator_no) - 1); 3247 ret = device_register(&rdev->dev); 3248 if (ret != 0) { 3249 put_device(&rdev->dev); 3250 goto clean; 3251 } 3252 3253 dev_set_drvdata(&rdev->dev, rdev); 3254 3255 if (config->ena_gpio) { 3256 ret = gpio_request_one(config->ena_gpio, 3257 GPIOF_DIR_OUT | config->ena_gpio_flags, 3258 rdev_get_name(rdev)); 3259 if (ret != 0) { 3260 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3261 config->ena_gpio, ret); 3262 goto clean; 3263 } 3264 3265 rdev->ena_gpio = config->ena_gpio; 3266 rdev->ena_gpio_invert = config->ena_gpio_invert; 3267 3268 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3269 rdev->ena_gpio_state = 1; 3270 3271 if (rdev->ena_gpio_invert) 3272 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3273 } 3274 3275 /* set regulator constraints */ 3276 if (init_data) 3277 constraints = &init_data->constraints; 3278 3279 ret = set_machine_constraints(rdev, constraints); 3280 if (ret < 0) 3281 goto scrub; 3282 3283 /* add attributes supported by this regulator */ 3284 ret = add_regulator_attributes(rdev); 3285 if (ret < 0) 3286 goto scrub; 3287 3288 if (init_data && init_data->supply_regulator) 3289 supply = init_data->supply_regulator; 3290 else if (regulator_desc->supply_name) 3291 supply = regulator_desc->supply_name; 3292 3293 if (supply) { 3294 struct regulator_dev *r; 3295 3296 r = regulator_dev_lookup(dev, supply, &ret); 3297 3298 if (!r) { 3299 dev_err(dev, "Failed to find supply %s\n", supply); 3300 ret = -EPROBE_DEFER; 3301 goto scrub; 3302 } 3303 3304 ret = set_supply(rdev, r); 3305 if (ret < 0) 3306 goto scrub; 3307 3308 /* Enable supply if rail is enabled */ 3309 if (_regulator_is_enabled(rdev)) { 3310 ret = regulator_enable(rdev->supply); 3311 if (ret < 0) 3312 goto scrub; 3313 } 3314 } 3315 3316 /* add consumers devices */ 3317 if (init_data) { 3318 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3319 ret = set_consumer_device_supply(rdev, 3320 init_data->consumer_supplies[i].dev_name, 3321 init_data->consumer_supplies[i].supply); 3322 if (ret < 0) { 3323 dev_err(dev, "Failed to set supply %s\n", 3324 init_data->consumer_supplies[i].supply); 3325 goto unset_supplies; 3326 } 3327 } 3328 } 3329 3330 list_add(&rdev->list, ®ulator_list); 3331 3332 rdev_init_debugfs(rdev); 3333out: 3334 mutex_unlock(®ulator_list_mutex); 3335 return rdev; 3336 3337unset_supplies: 3338 unset_regulator_supplies(rdev); 3339 3340scrub: 3341 if (rdev->supply) 3342 regulator_put(rdev->supply); 3343 if (rdev->ena_gpio) 3344 gpio_free(rdev->ena_gpio); 3345 kfree(rdev->constraints); 3346 device_unregister(&rdev->dev); 3347 /* device core frees rdev */ 3348 rdev = ERR_PTR(ret); 3349 goto out; 3350 3351clean: 3352 kfree(rdev); 3353 rdev = ERR_PTR(ret); 3354 goto out; 3355} 3356EXPORT_SYMBOL_GPL(regulator_register); 3357 3358/** 3359 * regulator_unregister - unregister regulator 3360 * @rdev: regulator to unregister 3361 * 3362 * Called by regulator drivers to unregister a regulator. 3363 */ 3364void regulator_unregister(struct regulator_dev *rdev) 3365{ 3366 if (rdev == NULL) 3367 return; 3368 3369 if (rdev->supply) 3370 regulator_put(rdev->supply); 3371 mutex_lock(®ulator_list_mutex); 3372 debugfs_remove_recursive(rdev->debugfs); 3373 flush_work_sync(&rdev->disable_work.work); 3374 WARN_ON(rdev->open_count); 3375 unset_regulator_supplies(rdev); 3376 list_del(&rdev->list); 3377 kfree(rdev->constraints); 3378 if (rdev->ena_gpio) 3379 gpio_free(rdev->ena_gpio); 3380 device_unregister(&rdev->dev); 3381 mutex_unlock(®ulator_list_mutex); 3382} 3383EXPORT_SYMBOL_GPL(regulator_unregister); 3384 3385/** 3386 * regulator_suspend_prepare - prepare regulators for system wide suspend 3387 * @state: system suspend state 3388 * 3389 * Configure each regulator with it's suspend operating parameters for state. 3390 * This will usually be called by machine suspend code prior to supending. 3391 */ 3392int regulator_suspend_prepare(suspend_state_t state) 3393{ 3394 struct regulator_dev *rdev; 3395 int ret = 0; 3396 3397 /* ON is handled by regulator active state */ 3398 if (state == PM_SUSPEND_ON) 3399 return -EINVAL; 3400 3401 mutex_lock(®ulator_list_mutex); 3402 list_for_each_entry(rdev, ®ulator_list, list) { 3403 3404 mutex_lock(&rdev->mutex); 3405 ret = suspend_prepare(rdev, state); 3406 mutex_unlock(&rdev->mutex); 3407 3408 if (ret < 0) { 3409 rdev_err(rdev, "failed to prepare\n"); 3410 goto out; 3411 } 3412 } 3413out: 3414 mutex_unlock(®ulator_list_mutex); 3415 return ret; 3416} 3417EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3418 3419/** 3420 * regulator_suspend_finish - resume regulators from system wide suspend 3421 * 3422 * Turn on regulators that might be turned off by regulator_suspend_prepare 3423 * and that should be turned on according to the regulators properties. 3424 */ 3425int regulator_suspend_finish(void) 3426{ 3427 struct regulator_dev *rdev; 3428 int ret = 0, error; 3429 3430 mutex_lock(®ulator_list_mutex); 3431 list_for_each_entry(rdev, ®ulator_list, list) { 3432 struct regulator_ops *ops = rdev->desc->ops; 3433 3434 mutex_lock(&rdev->mutex); 3435 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3436 ops->enable) { 3437 error = ops->enable(rdev); 3438 if (error) 3439 ret = error; 3440 } else { 3441 if (!has_full_constraints) 3442 goto unlock; 3443 if (!ops->disable) 3444 goto unlock; 3445 if (!_regulator_is_enabled(rdev)) 3446 goto unlock; 3447 3448 error = ops->disable(rdev); 3449 if (error) 3450 ret = error; 3451 } 3452unlock: 3453 mutex_unlock(&rdev->mutex); 3454 } 3455 mutex_unlock(®ulator_list_mutex); 3456 return ret; 3457} 3458EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3459 3460/** 3461 * regulator_has_full_constraints - the system has fully specified constraints 3462 * 3463 * Calling this function will cause the regulator API to disable all 3464 * regulators which have a zero use count and don't have an always_on 3465 * constraint in a late_initcall. 3466 * 3467 * The intention is that this will become the default behaviour in a 3468 * future kernel release so users are encouraged to use this facility 3469 * now. 3470 */ 3471void regulator_has_full_constraints(void) 3472{ 3473 has_full_constraints = 1; 3474} 3475EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3476 3477/** 3478 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3479 * 3480 * Calling this function will cause the regulator API to provide a 3481 * dummy regulator to consumers if no physical regulator is found, 3482 * allowing most consumers to proceed as though a regulator were 3483 * configured. This allows systems such as those with software 3484 * controllable regulators for the CPU core only to be brought up more 3485 * readily. 3486 */ 3487void regulator_use_dummy_regulator(void) 3488{ 3489 board_wants_dummy_regulator = true; 3490} 3491EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3492 3493/** 3494 * rdev_get_drvdata - get rdev regulator driver data 3495 * @rdev: regulator 3496 * 3497 * Get rdev regulator driver private data. This call can be used in the 3498 * regulator driver context. 3499 */ 3500void *rdev_get_drvdata(struct regulator_dev *rdev) 3501{ 3502 return rdev->reg_data; 3503} 3504EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3505 3506/** 3507 * regulator_get_drvdata - get regulator driver data 3508 * @regulator: regulator 3509 * 3510 * Get regulator driver private data. This call can be used in the consumer 3511 * driver context when non API regulator specific functions need to be called. 3512 */ 3513void *regulator_get_drvdata(struct regulator *regulator) 3514{ 3515 return regulator->rdev->reg_data; 3516} 3517EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3518 3519/** 3520 * regulator_set_drvdata - set regulator driver data 3521 * @regulator: regulator 3522 * @data: data 3523 */ 3524void regulator_set_drvdata(struct regulator *regulator, void *data) 3525{ 3526 regulator->rdev->reg_data = data; 3527} 3528EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3529 3530/** 3531 * regulator_get_id - get regulator ID 3532 * @rdev: regulator 3533 */ 3534int rdev_get_id(struct regulator_dev *rdev) 3535{ 3536 return rdev->desc->id; 3537} 3538EXPORT_SYMBOL_GPL(rdev_get_id); 3539 3540struct device *rdev_get_dev(struct regulator_dev *rdev) 3541{ 3542 return &rdev->dev; 3543} 3544EXPORT_SYMBOL_GPL(rdev_get_dev); 3545 3546void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3547{ 3548 return reg_init_data->driver_data; 3549} 3550EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3551 3552#ifdef CONFIG_DEBUG_FS 3553static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3554 size_t count, loff_t *ppos) 3555{ 3556 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3557 ssize_t len, ret = 0; 3558 struct regulator_map *map; 3559 3560 if (!buf) 3561 return -ENOMEM; 3562 3563 list_for_each_entry(map, ®ulator_map_list, list) { 3564 len = snprintf(buf + ret, PAGE_SIZE - ret, 3565 "%s -> %s.%s\n", 3566 rdev_get_name(map->regulator), map->dev_name, 3567 map->supply); 3568 if (len >= 0) 3569 ret += len; 3570 if (ret > PAGE_SIZE) { 3571 ret = PAGE_SIZE; 3572 break; 3573 } 3574 } 3575 3576 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3577 3578 kfree(buf); 3579 3580 return ret; 3581} 3582#endif 3583 3584static const struct file_operations supply_map_fops = { 3585#ifdef CONFIG_DEBUG_FS 3586 .read = supply_map_read_file, 3587 .llseek = default_llseek, 3588#endif 3589}; 3590 3591static int __init regulator_init(void) 3592{ 3593 int ret; 3594 3595 ret = class_register(®ulator_class); 3596 3597 debugfs_root = debugfs_create_dir("regulator", NULL); 3598 if (!debugfs_root) 3599 pr_warn("regulator: Failed to create debugfs directory\n"); 3600 3601 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3602 &supply_map_fops); 3603 3604 regulator_dummy_init(); 3605 3606 return ret; 3607} 3608 3609/* init early to allow our consumers to complete system booting */ 3610core_initcall(regulator_init); 3611 3612static int __init regulator_init_complete(void) 3613{ 3614 struct regulator_dev *rdev; 3615 struct regulator_ops *ops; 3616 struct regulation_constraints *c; 3617 int enabled, ret; 3618 3619 mutex_lock(®ulator_list_mutex); 3620 3621 /* If we have a full configuration then disable any regulators 3622 * which are not in use or always_on. This will become the 3623 * default behaviour in the future. 3624 */ 3625 list_for_each_entry(rdev, ®ulator_list, list) { 3626 ops = rdev->desc->ops; 3627 c = rdev->constraints; 3628 3629 if (!ops->disable || (c && c->always_on)) 3630 continue; 3631 3632 mutex_lock(&rdev->mutex); 3633 3634 if (rdev->use_count) 3635 goto unlock; 3636 3637 /* If we can't read the status assume it's on. */ 3638 if (ops->is_enabled) 3639 enabled = ops->is_enabled(rdev); 3640 else 3641 enabled = 1; 3642 3643 if (!enabled) 3644 goto unlock; 3645 3646 if (has_full_constraints) { 3647 /* We log since this may kill the system if it 3648 * goes wrong. */ 3649 rdev_info(rdev, "disabling\n"); 3650 ret = ops->disable(rdev); 3651 if (ret != 0) { 3652 rdev_err(rdev, "couldn't disable: %d\n", ret); 3653 } 3654 } else { 3655 /* The intention is that in future we will 3656 * assume that full constraints are provided 3657 * so warn even if we aren't going to do 3658 * anything here. 3659 */ 3660 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3661 } 3662 3663unlock: 3664 mutex_unlock(&rdev->mutex); 3665 } 3666 3667 mutex_unlock(®ulator_list_mutex); 3668 3669 return 0; 3670} 3671late_initcall(regulator_init_complete); 3672