core.c revision d1e7de3007c6e34c5e6d5e1b707b5aba4a1cd57f
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 unsigned int bypass:1; 81 int uA_load; 82 int min_uV; 83 int max_uV; 84 char *supply_name; 85 struct device_attribute dev_attr; 86 struct regulator_dev *rdev; 87 struct dentry *debugfs; 88}; 89 90static int _regulator_is_enabled(struct regulator_dev *rdev); 91static int _regulator_disable(struct regulator_dev *rdev); 92static int _regulator_get_voltage(struct regulator_dev *rdev); 93static int _regulator_get_current_limit(struct regulator_dev *rdev); 94static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 95static void _notifier_call_chain(struct regulator_dev *rdev, 96 unsigned long event, void *data); 97static int _regulator_do_set_voltage(struct regulator_dev *rdev, 98 int min_uV, int max_uV); 99static struct regulator *create_regulator(struct regulator_dev *rdev, 100 struct device *dev, 101 const char *supply_name); 102 103static const char *rdev_get_name(struct regulator_dev *rdev) 104{ 105 if (rdev->constraints && rdev->constraints->name) 106 return rdev->constraints->name; 107 else if (rdev->desc->name) 108 return rdev->desc->name; 109 else 110 return ""; 111} 112 113/** 114 * of_get_regulator - get a regulator device node based on supply name 115 * @dev: Device pointer for the consumer (of regulator) device 116 * @supply: regulator supply name 117 * 118 * Extract the regulator device node corresponding to the supply name. 119 * retruns the device node corresponding to the regulator if found, else 120 * returns NULL. 121 */ 122static struct device_node *of_get_regulator(struct device *dev, const char *supply) 123{ 124 struct device_node *regnode = NULL; 125 char prop_name[32]; /* 32 is max size of property name */ 126 127 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 128 129 snprintf(prop_name, 32, "%s-supply", supply); 130 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 131 132 if (!regnode) { 133 dev_dbg(dev, "Looking up %s property in node %s failed", 134 prop_name, dev->of_node->full_name); 135 return NULL; 136 } 137 return regnode; 138} 139 140static int _regulator_can_change_status(struct regulator_dev *rdev) 141{ 142 if (!rdev->constraints) 143 return 0; 144 145 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 146 return 1; 147 else 148 return 0; 149} 150 151/* Platform voltage constraint check */ 152static int regulator_check_voltage(struct regulator_dev *rdev, 153 int *min_uV, int *max_uV) 154{ 155 BUG_ON(*min_uV > *max_uV); 156 157 if (!rdev->constraints) { 158 rdev_err(rdev, "no constraints\n"); 159 return -ENODEV; 160 } 161 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 162 rdev_err(rdev, "operation not allowed\n"); 163 return -EPERM; 164 } 165 166 if (*max_uV > rdev->constraints->max_uV) 167 *max_uV = rdev->constraints->max_uV; 168 if (*min_uV < rdev->constraints->min_uV) 169 *min_uV = rdev->constraints->min_uV; 170 171 if (*min_uV > *max_uV) { 172 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 173 *min_uV, *max_uV); 174 return -EINVAL; 175 } 176 177 return 0; 178} 179 180/* Make sure we select a voltage that suits the needs of all 181 * regulator consumers 182 */ 183static int regulator_check_consumers(struct regulator_dev *rdev, 184 int *min_uV, int *max_uV) 185{ 186 struct regulator *regulator; 187 188 list_for_each_entry(regulator, &rdev->consumer_list, list) { 189 /* 190 * Assume consumers that didn't say anything are OK 191 * with anything in the constraint range. 192 */ 193 if (!regulator->min_uV && !regulator->max_uV) 194 continue; 195 196 if (*max_uV > regulator->max_uV) 197 *max_uV = regulator->max_uV; 198 if (*min_uV < regulator->min_uV) 199 *min_uV = regulator->min_uV; 200 } 201 202 if (*min_uV > *max_uV) 203 return -EINVAL; 204 205 return 0; 206} 207 208/* current constraint check */ 209static int regulator_check_current_limit(struct regulator_dev *rdev, 210 int *min_uA, int *max_uA) 211{ 212 BUG_ON(*min_uA > *max_uA); 213 214 if (!rdev->constraints) { 215 rdev_err(rdev, "no constraints\n"); 216 return -ENODEV; 217 } 218 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 219 rdev_err(rdev, "operation not allowed\n"); 220 return -EPERM; 221 } 222 223 if (*max_uA > rdev->constraints->max_uA) 224 *max_uA = rdev->constraints->max_uA; 225 if (*min_uA < rdev->constraints->min_uA) 226 *min_uA = rdev->constraints->min_uA; 227 228 if (*min_uA > *max_uA) { 229 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 230 *min_uA, *max_uA); 231 return -EINVAL; 232 } 233 234 return 0; 235} 236 237/* operating mode constraint check */ 238static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 239{ 240 switch (*mode) { 241 case REGULATOR_MODE_FAST: 242 case REGULATOR_MODE_NORMAL: 243 case REGULATOR_MODE_IDLE: 244 case REGULATOR_MODE_STANDBY: 245 break; 246 default: 247 rdev_err(rdev, "invalid mode %x specified\n", *mode); 248 return -EINVAL; 249 } 250 251 if (!rdev->constraints) { 252 rdev_err(rdev, "no constraints\n"); 253 return -ENODEV; 254 } 255 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 256 rdev_err(rdev, "operation not allowed\n"); 257 return -EPERM; 258 } 259 260 /* The modes are bitmasks, the most power hungry modes having 261 * the lowest values. If the requested mode isn't supported 262 * try higher modes. */ 263 while (*mode) { 264 if (rdev->constraints->valid_modes_mask & *mode) 265 return 0; 266 *mode /= 2; 267 } 268 269 return -EINVAL; 270} 271 272/* dynamic regulator mode switching constraint check */ 273static int regulator_check_drms(struct regulator_dev *rdev) 274{ 275 if (!rdev->constraints) { 276 rdev_err(rdev, "no constraints\n"); 277 return -ENODEV; 278 } 279 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 280 rdev_err(rdev, "operation not allowed\n"); 281 return -EPERM; 282 } 283 return 0; 284} 285 286static ssize_t regulator_uV_show(struct device *dev, 287 struct device_attribute *attr, char *buf) 288{ 289 struct regulator_dev *rdev = dev_get_drvdata(dev); 290 ssize_t ret; 291 292 mutex_lock(&rdev->mutex); 293 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 294 mutex_unlock(&rdev->mutex); 295 296 return ret; 297} 298static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 299 300static ssize_t regulator_uA_show(struct device *dev, 301 struct device_attribute *attr, char *buf) 302{ 303 struct regulator_dev *rdev = dev_get_drvdata(dev); 304 305 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 306} 307static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 308 309static ssize_t regulator_name_show(struct device *dev, 310 struct device_attribute *attr, char *buf) 311{ 312 struct regulator_dev *rdev = dev_get_drvdata(dev); 313 314 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 315} 316 317static ssize_t regulator_print_opmode(char *buf, int mode) 318{ 319 switch (mode) { 320 case REGULATOR_MODE_FAST: 321 return sprintf(buf, "fast\n"); 322 case REGULATOR_MODE_NORMAL: 323 return sprintf(buf, "normal\n"); 324 case REGULATOR_MODE_IDLE: 325 return sprintf(buf, "idle\n"); 326 case REGULATOR_MODE_STANDBY: 327 return sprintf(buf, "standby\n"); 328 } 329 return sprintf(buf, "unknown\n"); 330} 331 332static ssize_t regulator_opmode_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 337 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 338} 339static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 340 341static ssize_t regulator_print_state(char *buf, int state) 342{ 343 if (state > 0) 344 return sprintf(buf, "enabled\n"); 345 else if (state == 0) 346 return sprintf(buf, "disabled\n"); 347 else 348 return sprintf(buf, "unknown\n"); 349} 350 351static ssize_t regulator_state_show(struct device *dev, 352 struct device_attribute *attr, char *buf) 353{ 354 struct regulator_dev *rdev = dev_get_drvdata(dev); 355 ssize_t ret; 356 357 mutex_lock(&rdev->mutex); 358 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 359 mutex_unlock(&rdev->mutex); 360 361 return ret; 362} 363static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 364 365static ssize_t regulator_status_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367{ 368 struct regulator_dev *rdev = dev_get_drvdata(dev); 369 int status; 370 char *label; 371 372 status = rdev->desc->ops->get_status(rdev); 373 if (status < 0) 374 return status; 375 376 switch (status) { 377 case REGULATOR_STATUS_OFF: 378 label = "off"; 379 break; 380 case REGULATOR_STATUS_ON: 381 label = "on"; 382 break; 383 case REGULATOR_STATUS_ERROR: 384 label = "error"; 385 break; 386 case REGULATOR_STATUS_FAST: 387 label = "fast"; 388 break; 389 case REGULATOR_STATUS_NORMAL: 390 label = "normal"; 391 break; 392 case REGULATOR_STATUS_IDLE: 393 label = "idle"; 394 break; 395 case REGULATOR_STATUS_STANDBY: 396 label = "standby"; 397 break; 398 case REGULATOR_STATUS_BYPASS: 399 label = "bypass"; 400 break; 401 case REGULATOR_STATUS_UNDEFINED: 402 label = "undefined"; 403 break; 404 default: 405 return -ERANGE; 406 } 407 408 return sprintf(buf, "%s\n", label); 409} 410static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 411 412static ssize_t regulator_min_uA_show(struct device *dev, 413 struct device_attribute *attr, char *buf) 414{ 415 struct regulator_dev *rdev = dev_get_drvdata(dev); 416 417 if (!rdev->constraints) 418 return sprintf(buf, "constraint not defined\n"); 419 420 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 421} 422static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 423 424static ssize_t regulator_max_uA_show(struct device *dev, 425 struct device_attribute *attr, char *buf) 426{ 427 struct regulator_dev *rdev = dev_get_drvdata(dev); 428 429 if (!rdev->constraints) 430 return sprintf(buf, "constraint not defined\n"); 431 432 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 433} 434static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 435 436static ssize_t regulator_min_uV_show(struct device *dev, 437 struct device_attribute *attr, char *buf) 438{ 439 struct regulator_dev *rdev = dev_get_drvdata(dev); 440 441 if (!rdev->constraints) 442 return sprintf(buf, "constraint not defined\n"); 443 444 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 445} 446static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 447 448static ssize_t regulator_max_uV_show(struct device *dev, 449 struct device_attribute *attr, char *buf) 450{ 451 struct regulator_dev *rdev = dev_get_drvdata(dev); 452 453 if (!rdev->constraints) 454 return sprintf(buf, "constraint not defined\n"); 455 456 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 457} 458static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 459 460static ssize_t regulator_total_uA_show(struct device *dev, 461 struct device_attribute *attr, char *buf) 462{ 463 struct regulator_dev *rdev = dev_get_drvdata(dev); 464 struct regulator *regulator; 465 int uA = 0; 466 467 mutex_lock(&rdev->mutex); 468 list_for_each_entry(regulator, &rdev->consumer_list, list) 469 uA += regulator->uA_load; 470 mutex_unlock(&rdev->mutex); 471 return sprintf(buf, "%d\n", uA); 472} 473static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 474 475static ssize_t regulator_num_users_show(struct device *dev, 476 struct device_attribute *attr, char *buf) 477{ 478 struct regulator_dev *rdev = dev_get_drvdata(dev); 479 return sprintf(buf, "%d\n", rdev->use_count); 480} 481 482static ssize_t regulator_type_show(struct device *dev, 483 struct device_attribute *attr, char *buf) 484{ 485 struct regulator_dev *rdev = dev_get_drvdata(dev); 486 487 switch (rdev->desc->type) { 488 case REGULATOR_VOLTAGE: 489 return sprintf(buf, "voltage\n"); 490 case REGULATOR_CURRENT: 491 return sprintf(buf, "current\n"); 492 } 493 return sprintf(buf, "unknown\n"); 494} 495 496static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 497 struct device_attribute *attr, char *buf) 498{ 499 struct regulator_dev *rdev = dev_get_drvdata(dev); 500 501 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 502} 503static DEVICE_ATTR(suspend_mem_microvolts, 0444, 504 regulator_suspend_mem_uV_show, NULL); 505 506static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 507 struct device_attribute *attr, char *buf) 508{ 509 struct regulator_dev *rdev = dev_get_drvdata(dev); 510 511 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 512} 513static DEVICE_ATTR(suspend_disk_microvolts, 0444, 514 regulator_suspend_disk_uV_show, NULL); 515 516static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 522} 523static DEVICE_ATTR(suspend_standby_microvolts, 0444, 524 regulator_suspend_standby_uV_show, NULL); 525 526static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return regulator_print_opmode(buf, 532 rdev->constraints->state_mem.mode); 533} 534static DEVICE_ATTR(suspend_mem_mode, 0444, 535 regulator_suspend_mem_mode_show, NULL); 536 537static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 538 struct device_attribute *attr, char *buf) 539{ 540 struct regulator_dev *rdev = dev_get_drvdata(dev); 541 542 return regulator_print_opmode(buf, 543 rdev->constraints->state_disk.mode); 544} 545static DEVICE_ATTR(suspend_disk_mode, 0444, 546 regulator_suspend_disk_mode_show, NULL); 547 548static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 549 struct device_attribute *attr, char *buf) 550{ 551 struct regulator_dev *rdev = dev_get_drvdata(dev); 552 553 return regulator_print_opmode(buf, 554 rdev->constraints->state_standby.mode); 555} 556static DEVICE_ATTR(suspend_standby_mode, 0444, 557 regulator_suspend_standby_mode_show, NULL); 558 559static ssize_t regulator_suspend_mem_state_show(struct device *dev, 560 struct device_attribute *attr, char *buf) 561{ 562 struct regulator_dev *rdev = dev_get_drvdata(dev); 563 564 return regulator_print_state(buf, 565 rdev->constraints->state_mem.enabled); 566} 567static DEVICE_ATTR(suspend_mem_state, 0444, 568 regulator_suspend_mem_state_show, NULL); 569 570static ssize_t regulator_suspend_disk_state_show(struct device *dev, 571 struct device_attribute *attr, char *buf) 572{ 573 struct regulator_dev *rdev = dev_get_drvdata(dev); 574 575 return regulator_print_state(buf, 576 rdev->constraints->state_disk.enabled); 577} 578static DEVICE_ATTR(suspend_disk_state, 0444, 579 regulator_suspend_disk_state_show, NULL); 580 581static ssize_t regulator_suspend_standby_state_show(struct device *dev, 582 struct device_attribute *attr, char *buf) 583{ 584 struct regulator_dev *rdev = dev_get_drvdata(dev); 585 586 return regulator_print_state(buf, 587 rdev->constraints->state_standby.enabled); 588} 589static DEVICE_ATTR(suspend_standby_state, 0444, 590 regulator_suspend_standby_state_show, NULL); 591 592static ssize_t regulator_bypass_show(struct device *dev, 593 struct device_attribute *attr, char *buf) 594{ 595 struct regulator_dev *rdev = dev_get_drvdata(dev); 596 const char *report; 597 bool bypass; 598 int ret; 599 600 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 601 602 if (ret != 0) 603 report = "unknown"; 604 else if (bypass) 605 report = "enabled"; 606 else 607 report = "disabled"; 608 609 return sprintf(buf, "%s\n", report); 610} 611static DEVICE_ATTR(bypass, 0444, 612 regulator_bypass_show, NULL); 613 614/* 615 * These are the only attributes are present for all regulators. 616 * Other attributes are a function of regulator functionality. 617 */ 618static struct device_attribute regulator_dev_attrs[] = { 619 __ATTR(name, 0444, regulator_name_show, NULL), 620 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 621 __ATTR(type, 0444, regulator_type_show, NULL), 622 __ATTR_NULL, 623}; 624 625static void regulator_dev_release(struct device *dev) 626{ 627 struct regulator_dev *rdev = dev_get_drvdata(dev); 628 kfree(rdev); 629} 630 631static struct class regulator_class = { 632 .name = "regulator", 633 .dev_release = regulator_dev_release, 634 .dev_attrs = regulator_dev_attrs, 635}; 636 637/* Calculate the new optimum regulator operating mode based on the new total 638 * consumer load. All locks held by caller */ 639static void drms_uA_update(struct regulator_dev *rdev) 640{ 641 struct regulator *sibling; 642 int current_uA = 0, output_uV, input_uV, err; 643 unsigned int mode; 644 645 err = regulator_check_drms(rdev); 646 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 647 (!rdev->desc->ops->get_voltage && 648 !rdev->desc->ops->get_voltage_sel) || 649 !rdev->desc->ops->set_mode) 650 return; 651 652 /* get output voltage */ 653 output_uV = _regulator_get_voltage(rdev); 654 if (output_uV <= 0) 655 return; 656 657 /* get input voltage */ 658 input_uV = 0; 659 if (rdev->supply) 660 input_uV = regulator_get_voltage(rdev->supply); 661 if (input_uV <= 0) 662 input_uV = rdev->constraints->input_uV; 663 if (input_uV <= 0) 664 return; 665 666 /* calc total requested load */ 667 list_for_each_entry(sibling, &rdev->consumer_list, list) 668 current_uA += sibling->uA_load; 669 670 /* now get the optimum mode for our new total regulator load */ 671 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 672 output_uV, current_uA); 673 674 /* check the new mode is allowed */ 675 err = regulator_mode_constrain(rdev, &mode); 676 if (err == 0) 677 rdev->desc->ops->set_mode(rdev, mode); 678} 679 680static int suspend_set_state(struct regulator_dev *rdev, 681 struct regulator_state *rstate) 682{ 683 int ret = 0; 684 685 /* If we have no suspend mode configration don't set anything; 686 * only warn if the driver implements set_suspend_voltage or 687 * set_suspend_mode callback. 688 */ 689 if (!rstate->enabled && !rstate->disabled) { 690 if (rdev->desc->ops->set_suspend_voltage || 691 rdev->desc->ops->set_suspend_mode) 692 rdev_warn(rdev, "No configuration\n"); 693 return 0; 694 } 695 696 if (rstate->enabled && rstate->disabled) { 697 rdev_err(rdev, "invalid configuration\n"); 698 return -EINVAL; 699 } 700 701 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 702 ret = rdev->desc->ops->set_suspend_enable(rdev); 703 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 704 ret = rdev->desc->ops->set_suspend_disable(rdev); 705 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 706 ret = 0; 707 708 if (ret < 0) { 709 rdev_err(rdev, "failed to enabled/disable\n"); 710 return ret; 711 } 712 713 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 714 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 715 if (ret < 0) { 716 rdev_err(rdev, "failed to set voltage\n"); 717 return ret; 718 } 719 } 720 721 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 722 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 723 if (ret < 0) { 724 rdev_err(rdev, "failed to set mode\n"); 725 return ret; 726 } 727 } 728 return ret; 729} 730 731/* locks held by caller */ 732static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 733{ 734 if (!rdev->constraints) 735 return -EINVAL; 736 737 switch (state) { 738 case PM_SUSPEND_STANDBY: 739 return suspend_set_state(rdev, 740 &rdev->constraints->state_standby); 741 case PM_SUSPEND_MEM: 742 return suspend_set_state(rdev, 743 &rdev->constraints->state_mem); 744 case PM_SUSPEND_MAX: 745 return suspend_set_state(rdev, 746 &rdev->constraints->state_disk); 747 default: 748 return -EINVAL; 749 } 750} 751 752static void print_constraints(struct regulator_dev *rdev) 753{ 754 struct regulation_constraints *constraints = rdev->constraints; 755 char buf[80] = ""; 756 int count = 0; 757 int ret; 758 759 if (constraints->min_uV && constraints->max_uV) { 760 if (constraints->min_uV == constraints->max_uV) 761 count += sprintf(buf + count, "%d mV ", 762 constraints->min_uV / 1000); 763 else 764 count += sprintf(buf + count, "%d <--> %d mV ", 765 constraints->min_uV / 1000, 766 constraints->max_uV / 1000); 767 } 768 769 if (!constraints->min_uV || 770 constraints->min_uV != constraints->max_uV) { 771 ret = _regulator_get_voltage(rdev); 772 if (ret > 0) 773 count += sprintf(buf + count, "at %d mV ", ret / 1000); 774 } 775 776 if (constraints->uV_offset) 777 count += sprintf(buf, "%dmV offset ", 778 constraints->uV_offset / 1000); 779 780 if (constraints->min_uA && constraints->max_uA) { 781 if (constraints->min_uA == constraints->max_uA) 782 count += sprintf(buf + count, "%d mA ", 783 constraints->min_uA / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mA ", 786 constraints->min_uA / 1000, 787 constraints->max_uA / 1000); 788 } 789 790 if (!constraints->min_uA || 791 constraints->min_uA != constraints->max_uA) { 792 ret = _regulator_get_current_limit(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mA ", ret / 1000); 795 } 796 797 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 798 count += sprintf(buf + count, "fast "); 799 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 800 count += sprintf(buf + count, "normal "); 801 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 802 count += sprintf(buf + count, "idle "); 803 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 804 count += sprintf(buf + count, "standby"); 805 806 if (!count) 807 sprintf(buf, "no parameters"); 808 809 rdev_info(rdev, "%s\n", buf); 810 811 if ((constraints->min_uV != constraints->max_uV) && 812 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 813 rdev_warn(rdev, 814 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 815} 816 817static int machine_constraints_voltage(struct regulator_dev *rdev, 818 struct regulation_constraints *constraints) 819{ 820 struct regulator_ops *ops = rdev->desc->ops; 821 int ret; 822 823 /* do we need to apply the constraint voltage */ 824 if (rdev->constraints->apply_uV && 825 rdev->constraints->min_uV == rdev->constraints->max_uV) { 826 ret = _regulator_do_set_voltage(rdev, 827 rdev->constraints->min_uV, 828 rdev->constraints->max_uV); 829 if (ret < 0) { 830 rdev_err(rdev, "failed to apply %duV constraint\n", 831 rdev->constraints->min_uV); 832 return ret; 833 } 834 } 835 836 /* constrain machine-level voltage specs to fit 837 * the actual range supported by this regulator. 838 */ 839 if (ops->list_voltage && rdev->desc->n_voltages) { 840 int count = rdev->desc->n_voltages; 841 int i; 842 int min_uV = INT_MAX; 843 int max_uV = INT_MIN; 844 int cmin = constraints->min_uV; 845 int cmax = constraints->max_uV; 846 847 /* it's safe to autoconfigure fixed-voltage supplies 848 and the constraints are used by list_voltage. */ 849 if (count == 1 && !cmin) { 850 cmin = 1; 851 cmax = INT_MAX; 852 constraints->min_uV = cmin; 853 constraints->max_uV = cmax; 854 } 855 856 /* voltage constraints are optional */ 857 if ((cmin == 0) && (cmax == 0)) 858 return 0; 859 860 /* else require explicit machine-level constraints */ 861 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 862 rdev_err(rdev, "invalid voltage constraints\n"); 863 return -EINVAL; 864 } 865 866 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 867 for (i = 0; i < count; i++) { 868 int value; 869 870 value = ops->list_voltage(rdev, i); 871 if (value <= 0) 872 continue; 873 874 /* maybe adjust [min_uV..max_uV] */ 875 if (value >= cmin && value < min_uV) 876 min_uV = value; 877 if (value <= cmax && value > max_uV) 878 max_uV = value; 879 } 880 881 /* final: [min_uV..max_uV] valid iff constraints valid */ 882 if (max_uV < min_uV) { 883 rdev_err(rdev, "unsupportable voltage constraints\n"); 884 return -EINVAL; 885 } 886 887 /* use regulator's subset of machine constraints */ 888 if (constraints->min_uV < min_uV) { 889 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 890 constraints->min_uV, min_uV); 891 constraints->min_uV = min_uV; 892 } 893 if (constraints->max_uV > max_uV) { 894 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 895 constraints->max_uV, max_uV); 896 constraints->max_uV = max_uV; 897 } 898 } 899 900 return 0; 901} 902 903/** 904 * set_machine_constraints - sets regulator constraints 905 * @rdev: regulator source 906 * @constraints: constraints to apply 907 * 908 * Allows platform initialisation code to define and constrain 909 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 910 * Constraints *must* be set by platform code in order for some 911 * regulator operations to proceed i.e. set_voltage, set_current_limit, 912 * set_mode. 913 */ 914static int set_machine_constraints(struct regulator_dev *rdev, 915 const struct regulation_constraints *constraints) 916{ 917 int ret = 0; 918 struct regulator_ops *ops = rdev->desc->ops; 919 920 if (constraints) 921 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 922 GFP_KERNEL); 923 else 924 rdev->constraints = kzalloc(sizeof(*constraints), 925 GFP_KERNEL); 926 if (!rdev->constraints) 927 return -ENOMEM; 928 929 ret = machine_constraints_voltage(rdev, rdev->constraints); 930 if (ret != 0) 931 goto out; 932 933 /* do we need to setup our suspend state */ 934 if (rdev->constraints->initial_state) { 935 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 936 if (ret < 0) { 937 rdev_err(rdev, "failed to set suspend state\n"); 938 goto out; 939 } 940 } 941 942 if (rdev->constraints->initial_mode) { 943 if (!ops->set_mode) { 944 rdev_err(rdev, "no set_mode operation\n"); 945 ret = -EINVAL; 946 goto out; 947 } 948 949 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 950 if (ret < 0) { 951 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 952 goto out; 953 } 954 } 955 956 /* If the constraints say the regulator should be on at this point 957 * and we have control then make sure it is enabled. 958 */ 959 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 960 ops->enable) { 961 ret = ops->enable(rdev); 962 if (ret < 0) { 963 rdev_err(rdev, "failed to enable\n"); 964 goto out; 965 } 966 } 967 968 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 969 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 970 if (ret < 0) { 971 rdev_err(rdev, "failed to set ramp_delay\n"); 972 goto out; 973 } 974 } 975 976 print_constraints(rdev); 977 return 0; 978out: 979 kfree(rdev->constraints); 980 rdev->constraints = NULL; 981 return ret; 982} 983 984/** 985 * set_supply - set regulator supply regulator 986 * @rdev: regulator name 987 * @supply_rdev: supply regulator name 988 * 989 * Called by platform initialisation code to set the supply regulator for this 990 * regulator. This ensures that a regulators supply will also be enabled by the 991 * core if it's child is enabled. 992 */ 993static int set_supply(struct regulator_dev *rdev, 994 struct regulator_dev *supply_rdev) 995{ 996 int err; 997 998 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 999 1000 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1001 if (rdev->supply == NULL) { 1002 err = -ENOMEM; 1003 return err; 1004 } 1005 supply_rdev->open_count++; 1006 1007 return 0; 1008} 1009 1010/** 1011 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1012 * @rdev: regulator source 1013 * @consumer_dev_name: dev_name() string for device supply applies to 1014 * @supply: symbolic name for supply 1015 * 1016 * Allows platform initialisation code to map physical regulator 1017 * sources to symbolic names for supplies for use by devices. Devices 1018 * should use these symbolic names to request regulators, avoiding the 1019 * need to provide board-specific regulator names as platform data. 1020 */ 1021static int set_consumer_device_supply(struct regulator_dev *rdev, 1022 const char *consumer_dev_name, 1023 const char *supply) 1024{ 1025 struct regulator_map *node; 1026 int has_dev; 1027 1028 if (supply == NULL) 1029 return -EINVAL; 1030 1031 if (consumer_dev_name != NULL) 1032 has_dev = 1; 1033 else 1034 has_dev = 0; 1035 1036 list_for_each_entry(node, ®ulator_map_list, list) { 1037 if (node->dev_name && consumer_dev_name) { 1038 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1039 continue; 1040 } else if (node->dev_name || consumer_dev_name) { 1041 continue; 1042 } 1043 1044 if (strcmp(node->supply, supply) != 0) 1045 continue; 1046 1047 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1048 consumer_dev_name, 1049 dev_name(&node->regulator->dev), 1050 node->regulator->desc->name, 1051 supply, 1052 dev_name(&rdev->dev), rdev_get_name(rdev)); 1053 return -EBUSY; 1054 } 1055 1056 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1057 if (node == NULL) 1058 return -ENOMEM; 1059 1060 node->regulator = rdev; 1061 node->supply = supply; 1062 1063 if (has_dev) { 1064 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1065 if (node->dev_name == NULL) { 1066 kfree(node); 1067 return -ENOMEM; 1068 } 1069 } 1070 1071 list_add(&node->list, ®ulator_map_list); 1072 return 0; 1073} 1074 1075static void unset_regulator_supplies(struct regulator_dev *rdev) 1076{ 1077 struct regulator_map *node, *n; 1078 1079 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1080 if (rdev == node->regulator) { 1081 list_del(&node->list); 1082 kfree(node->dev_name); 1083 kfree(node); 1084 } 1085 } 1086} 1087 1088#define REG_STR_SIZE 64 1089 1090static struct regulator *create_regulator(struct regulator_dev *rdev, 1091 struct device *dev, 1092 const char *supply_name) 1093{ 1094 struct regulator *regulator; 1095 char buf[REG_STR_SIZE]; 1096 int err, size; 1097 1098 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1099 if (regulator == NULL) 1100 return NULL; 1101 1102 mutex_lock(&rdev->mutex); 1103 regulator->rdev = rdev; 1104 list_add(®ulator->list, &rdev->consumer_list); 1105 1106 if (dev) { 1107 regulator->dev = dev; 1108 1109 /* Add a link to the device sysfs entry */ 1110 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1111 dev->kobj.name, supply_name); 1112 if (size >= REG_STR_SIZE) 1113 goto overflow_err; 1114 1115 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1116 if (regulator->supply_name == NULL) 1117 goto overflow_err; 1118 1119 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1120 buf); 1121 if (err) { 1122 rdev_warn(rdev, "could not add device link %s err %d\n", 1123 dev->kobj.name, err); 1124 /* non-fatal */ 1125 } 1126 } else { 1127 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1128 if (regulator->supply_name == NULL) 1129 goto overflow_err; 1130 } 1131 1132 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1133 rdev->debugfs); 1134 if (!regulator->debugfs) { 1135 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1136 } else { 1137 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1138 ®ulator->uA_load); 1139 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1140 ®ulator->min_uV); 1141 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1142 ®ulator->max_uV); 1143 } 1144 1145 /* 1146 * Check now if the regulator is an always on regulator - if 1147 * it is then we don't need to do nearly so much work for 1148 * enable/disable calls. 1149 */ 1150 if (!_regulator_can_change_status(rdev) && 1151 _regulator_is_enabled(rdev)) 1152 regulator->always_on = true; 1153 1154 mutex_unlock(&rdev->mutex); 1155 return regulator; 1156overflow_err: 1157 list_del(®ulator->list); 1158 kfree(regulator); 1159 mutex_unlock(&rdev->mutex); 1160 return NULL; 1161} 1162 1163static int _regulator_get_enable_time(struct regulator_dev *rdev) 1164{ 1165 if (!rdev->desc->ops->enable_time) 1166 return rdev->desc->enable_time; 1167 return rdev->desc->ops->enable_time(rdev); 1168} 1169 1170static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1171 const char *supply, 1172 int *ret) 1173{ 1174 struct regulator_dev *r; 1175 struct device_node *node; 1176 struct regulator_map *map; 1177 const char *devname = NULL; 1178 1179 /* first do a dt based lookup */ 1180 if (dev && dev->of_node) { 1181 node = of_get_regulator(dev, supply); 1182 if (node) { 1183 list_for_each_entry(r, ®ulator_list, list) 1184 if (r->dev.parent && 1185 node == r->dev.of_node) 1186 return r; 1187 } else { 1188 /* 1189 * If we couldn't even get the node then it's 1190 * not just that the device didn't register 1191 * yet, there's no node and we'll never 1192 * succeed. 1193 */ 1194 *ret = -ENODEV; 1195 } 1196 } 1197 1198 /* if not found, try doing it non-dt way */ 1199 if (dev) 1200 devname = dev_name(dev); 1201 1202 list_for_each_entry(r, ®ulator_list, list) 1203 if (strcmp(rdev_get_name(r), supply) == 0) 1204 return r; 1205 1206 list_for_each_entry(map, ®ulator_map_list, list) { 1207 /* If the mapping has a device set up it must match */ 1208 if (map->dev_name && 1209 (!devname || strcmp(map->dev_name, devname))) 1210 continue; 1211 1212 if (strcmp(map->supply, supply) == 0) 1213 return map->regulator; 1214 } 1215 1216 1217 return NULL; 1218} 1219 1220/* Internal regulator request function */ 1221static struct regulator *_regulator_get(struct device *dev, const char *id, 1222 int exclusive) 1223{ 1224 struct regulator_dev *rdev; 1225 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1226 const char *devname = NULL; 1227 int ret; 1228 1229 if (id == NULL) { 1230 pr_err("get() with no identifier\n"); 1231 return regulator; 1232 } 1233 1234 if (dev) 1235 devname = dev_name(dev); 1236 1237 mutex_lock(®ulator_list_mutex); 1238 1239 rdev = regulator_dev_lookup(dev, id, &ret); 1240 if (rdev) 1241 goto found; 1242 1243 if (board_wants_dummy_regulator) { 1244 rdev = dummy_regulator_rdev; 1245 goto found; 1246 } 1247 1248#ifdef CONFIG_REGULATOR_DUMMY 1249 if (!devname) 1250 devname = "deviceless"; 1251 1252 /* If the board didn't flag that it was fully constrained then 1253 * substitute in a dummy regulator so consumers can continue. 1254 */ 1255 if (!has_full_constraints) { 1256 pr_warn("%s supply %s not found, using dummy regulator\n", 1257 devname, id); 1258 rdev = dummy_regulator_rdev; 1259 goto found; 1260 } 1261#endif 1262 1263 mutex_unlock(®ulator_list_mutex); 1264 return regulator; 1265 1266found: 1267 if (rdev->exclusive) { 1268 regulator = ERR_PTR(-EPERM); 1269 goto out; 1270 } 1271 1272 if (exclusive && rdev->open_count) { 1273 regulator = ERR_PTR(-EBUSY); 1274 goto out; 1275 } 1276 1277 if (!try_module_get(rdev->owner)) 1278 goto out; 1279 1280 regulator = create_regulator(rdev, dev, id); 1281 if (regulator == NULL) { 1282 regulator = ERR_PTR(-ENOMEM); 1283 module_put(rdev->owner); 1284 goto out; 1285 } 1286 1287 rdev->open_count++; 1288 if (exclusive) { 1289 rdev->exclusive = 1; 1290 1291 ret = _regulator_is_enabled(rdev); 1292 if (ret > 0) 1293 rdev->use_count = 1; 1294 else 1295 rdev->use_count = 0; 1296 } 1297 1298out: 1299 mutex_unlock(®ulator_list_mutex); 1300 1301 return regulator; 1302} 1303 1304/** 1305 * regulator_get - lookup and obtain a reference to a regulator. 1306 * @dev: device for regulator "consumer" 1307 * @id: Supply name or regulator ID. 1308 * 1309 * Returns a struct regulator corresponding to the regulator producer, 1310 * or IS_ERR() condition containing errno. 1311 * 1312 * Use of supply names configured via regulator_set_device_supply() is 1313 * strongly encouraged. It is recommended that the supply name used 1314 * should match the name used for the supply and/or the relevant 1315 * device pins in the datasheet. 1316 */ 1317struct regulator *regulator_get(struct device *dev, const char *id) 1318{ 1319 return _regulator_get(dev, id, 0); 1320} 1321EXPORT_SYMBOL_GPL(regulator_get); 1322 1323static void devm_regulator_release(struct device *dev, void *res) 1324{ 1325 regulator_put(*(struct regulator **)res); 1326} 1327 1328/** 1329 * devm_regulator_get - Resource managed regulator_get() 1330 * @dev: device for regulator "consumer" 1331 * @id: Supply name or regulator ID. 1332 * 1333 * Managed regulator_get(). Regulators returned from this function are 1334 * automatically regulator_put() on driver detach. See regulator_get() for more 1335 * information. 1336 */ 1337struct regulator *devm_regulator_get(struct device *dev, const char *id) 1338{ 1339 struct regulator **ptr, *regulator; 1340 1341 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1342 if (!ptr) 1343 return ERR_PTR(-ENOMEM); 1344 1345 regulator = regulator_get(dev, id); 1346 if (!IS_ERR(regulator)) { 1347 *ptr = regulator; 1348 devres_add(dev, ptr); 1349 } else { 1350 devres_free(ptr); 1351 } 1352 1353 return regulator; 1354} 1355EXPORT_SYMBOL_GPL(devm_regulator_get); 1356 1357/** 1358 * regulator_get_exclusive - obtain exclusive access to a regulator. 1359 * @dev: device for regulator "consumer" 1360 * @id: Supply name or regulator ID. 1361 * 1362 * Returns a struct regulator corresponding to the regulator producer, 1363 * or IS_ERR() condition containing errno. Other consumers will be 1364 * unable to obtain this reference is held and the use count for the 1365 * regulator will be initialised to reflect the current state of the 1366 * regulator. 1367 * 1368 * This is intended for use by consumers which cannot tolerate shared 1369 * use of the regulator such as those which need to force the 1370 * regulator off for correct operation of the hardware they are 1371 * controlling. 1372 * 1373 * Use of supply names configured via regulator_set_device_supply() is 1374 * strongly encouraged. It is recommended that the supply name used 1375 * should match the name used for the supply and/or the relevant 1376 * device pins in the datasheet. 1377 */ 1378struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1379{ 1380 return _regulator_get(dev, id, 1); 1381} 1382EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1383 1384/* Locks held by regulator_put() */ 1385static void _regulator_put(struct regulator *regulator) 1386{ 1387 struct regulator_dev *rdev; 1388 1389 if (regulator == NULL || IS_ERR(regulator)) 1390 return; 1391 1392 rdev = regulator->rdev; 1393 1394 debugfs_remove_recursive(regulator->debugfs); 1395 1396 /* remove any sysfs entries */ 1397 if (regulator->dev) 1398 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1399 kfree(regulator->supply_name); 1400 list_del(®ulator->list); 1401 kfree(regulator); 1402 1403 rdev->open_count--; 1404 rdev->exclusive = 0; 1405 1406 module_put(rdev->owner); 1407} 1408 1409/** 1410 * regulator_put - "free" the regulator source 1411 * @regulator: regulator source 1412 * 1413 * Note: drivers must ensure that all regulator_enable calls made on this 1414 * regulator source are balanced by regulator_disable calls prior to calling 1415 * this function. 1416 */ 1417void regulator_put(struct regulator *regulator) 1418{ 1419 mutex_lock(®ulator_list_mutex); 1420 _regulator_put(regulator); 1421 mutex_unlock(®ulator_list_mutex); 1422} 1423EXPORT_SYMBOL_GPL(regulator_put); 1424 1425static int devm_regulator_match(struct device *dev, void *res, void *data) 1426{ 1427 struct regulator **r = res; 1428 if (!r || !*r) { 1429 WARN_ON(!r || !*r); 1430 return 0; 1431 } 1432 return *r == data; 1433} 1434 1435/** 1436 * devm_regulator_put - Resource managed regulator_put() 1437 * @regulator: regulator to free 1438 * 1439 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1440 * this function will not need to be called and the resource management 1441 * code will ensure that the resource is freed. 1442 */ 1443void devm_regulator_put(struct regulator *regulator) 1444{ 1445 int rc; 1446 1447 rc = devres_release(regulator->dev, devm_regulator_release, 1448 devm_regulator_match, regulator); 1449 if (rc != 0) 1450 WARN_ON(rc); 1451} 1452EXPORT_SYMBOL_GPL(devm_regulator_put); 1453 1454static int _regulator_do_enable(struct regulator_dev *rdev) 1455{ 1456 int ret, delay; 1457 1458 /* Query before enabling in case configuration dependent. */ 1459 ret = _regulator_get_enable_time(rdev); 1460 if (ret >= 0) { 1461 delay = ret; 1462 } else { 1463 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1464 delay = 0; 1465 } 1466 1467 trace_regulator_enable(rdev_get_name(rdev)); 1468 1469 if (rdev->ena_gpio) { 1470 gpio_set_value_cansleep(rdev->ena_gpio, 1471 !rdev->ena_gpio_invert); 1472 rdev->ena_gpio_state = 1; 1473 } else if (rdev->desc->ops->enable) { 1474 ret = rdev->desc->ops->enable(rdev); 1475 if (ret < 0) 1476 return ret; 1477 } else { 1478 return -EINVAL; 1479 } 1480 1481 /* Allow the regulator to ramp; it would be useful to extend 1482 * this for bulk operations so that the regulators can ramp 1483 * together. */ 1484 trace_regulator_enable_delay(rdev_get_name(rdev)); 1485 1486 if (delay >= 1000) { 1487 mdelay(delay / 1000); 1488 udelay(delay % 1000); 1489 } else if (delay) { 1490 udelay(delay); 1491 } 1492 1493 trace_regulator_enable_complete(rdev_get_name(rdev)); 1494 1495 return 0; 1496} 1497 1498/* locks held by regulator_enable() */ 1499static int _regulator_enable(struct regulator_dev *rdev) 1500{ 1501 int ret; 1502 1503 /* check voltage and requested load before enabling */ 1504 if (rdev->constraints && 1505 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1506 drms_uA_update(rdev); 1507 1508 if (rdev->use_count == 0) { 1509 /* The regulator may on if it's not switchable or left on */ 1510 ret = _regulator_is_enabled(rdev); 1511 if (ret == -EINVAL || ret == 0) { 1512 if (!_regulator_can_change_status(rdev)) 1513 return -EPERM; 1514 1515 ret = _regulator_do_enable(rdev); 1516 if (ret < 0) 1517 return ret; 1518 1519 } else if (ret < 0) { 1520 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1521 return ret; 1522 } 1523 /* Fallthrough on positive return values - already enabled */ 1524 } 1525 1526 rdev->use_count++; 1527 1528 return 0; 1529} 1530 1531/** 1532 * regulator_enable - enable regulator output 1533 * @regulator: regulator source 1534 * 1535 * Request that the regulator be enabled with the regulator output at 1536 * the predefined voltage or current value. Calls to regulator_enable() 1537 * must be balanced with calls to regulator_disable(). 1538 * 1539 * NOTE: the output value can be set by other drivers, boot loader or may be 1540 * hardwired in the regulator. 1541 */ 1542int regulator_enable(struct regulator *regulator) 1543{ 1544 struct regulator_dev *rdev = regulator->rdev; 1545 int ret = 0; 1546 1547 if (regulator->always_on) 1548 return 0; 1549 1550 if (rdev->supply) { 1551 ret = regulator_enable(rdev->supply); 1552 if (ret != 0) 1553 return ret; 1554 } 1555 1556 mutex_lock(&rdev->mutex); 1557 ret = _regulator_enable(rdev); 1558 mutex_unlock(&rdev->mutex); 1559 1560 if (ret != 0 && rdev->supply) 1561 regulator_disable(rdev->supply); 1562 1563 return ret; 1564} 1565EXPORT_SYMBOL_GPL(regulator_enable); 1566 1567static int _regulator_do_disable(struct regulator_dev *rdev) 1568{ 1569 int ret; 1570 1571 trace_regulator_disable(rdev_get_name(rdev)); 1572 1573 if (rdev->ena_gpio) { 1574 gpio_set_value_cansleep(rdev->ena_gpio, 1575 rdev->ena_gpio_invert); 1576 rdev->ena_gpio_state = 0; 1577 1578 } else if (rdev->desc->ops->disable) { 1579 ret = rdev->desc->ops->disable(rdev); 1580 if (ret != 0) 1581 return ret; 1582 } 1583 1584 trace_regulator_disable_complete(rdev_get_name(rdev)); 1585 1586 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1587 NULL); 1588 return 0; 1589} 1590 1591/* locks held by regulator_disable() */ 1592static int _regulator_disable(struct regulator_dev *rdev) 1593{ 1594 int ret = 0; 1595 1596 if (WARN(rdev->use_count <= 0, 1597 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1598 return -EIO; 1599 1600 /* are we the last user and permitted to disable ? */ 1601 if (rdev->use_count == 1 && 1602 (rdev->constraints && !rdev->constraints->always_on)) { 1603 1604 /* we are last user */ 1605 if (_regulator_can_change_status(rdev)) { 1606 ret = _regulator_do_disable(rdev); 1607 if (ret < 0) { 1608 rdev_err(rdev, "failed to disable\n"); 1609 return ret; 1610 } 1611 } 1612 1613 rdev->use_count = 0; 1614 } else if (rdev->use_count > 1) { 1615 1616 if (rdev->constraints && 1617 (rdev->constraints->valid_ops_mask & 1618 REGULATOR_CHANGE_DRMS)) 1619 drms_uA_update(rdev); 1620 1621 rdev->use_count--; 1622 } 1623 1624 return ret; 1625} 1626 1627/** 1628 * regulator_disable - disable regulator output 1629 * @regulator: regulator source 1630 * 1631 * Disable the regulator output voltage or current. Calls to 1632 * regulator_enable() must be balanced with calls to 1633 * regulator_disable(). 1634 * 1635 * NOTE: this will only disable the regulator output if no other consumer 1636 * devices have it enabled, the regulator device supports disabling and 1637 * machine constraints permit this operation. 1638 */ 1639int regulator_disable(struct regulator *regulator) 1640{ 1641 struct regulator_dev *rdev = regulator->rdev; 1642 int ret = 0; 1643 1644 if (regulator->always_on) 1645 return 0; 1646 1647 mutex_lock(&rdev->mutex); 1648 ret = _regulator_disable(rdev); 1649 mutex_unlock(&rdev->mutex); 1650 1651 if (ret == 0 && rdev->supply) 1652 regulator_disable(rdev->supply); 1653 1654 return ret; 1655} 1656EXPORT_SYMBOL_GPL(regulator_disable); 1657 1658/* locks held by regulator_force_disable() */ 1659static int _regulator_force_disable(struct regulator_dev *rdev) 1660{ 1661 int ret = 0; 1662 1663 /* force disable */ 1664 if (rdev->desc->ops->disable) { 1665 /* ah well, who wants to live forever... */ 1666 ret = rdev->desc->ops->disable(rdev); 1667 if (ret < 0) { 1668 rdev_err(rdev, "failed to force disable\n"); 1669 return ret; 1670 } 1671 /* notify other consumers that power has been forced off */ 1672 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1673 REGULATOR_EVENT_DISABLE, NULL); 1674 } 1675 1676 return ret; 1677} 1678 1679/** 1680 * regulator_force_disable - force disable regulator output 1681 * @regulator: regulator source 1682 * 1683 * Forcibly disable the regulator output voltage or current. 1684 * NOTE: this *will* disable the regulator output even if other consumer 1685 * devices have it enabled. This should be used for situations when device 1686 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1687 */ 1688int regulator_force_disable(struct regulator *regulator) 1689{ 1690 struct regulator_dev *rdev = regulator->rdev; 1691 int ret; 1692 1693 mutex_lock(&rdev->mutex); 1694 regulator->uA_load = 0; 1695 ret = _regulator_force_disable(regulator->rdev); 1696 mutex_unlock(&rdev->mutex); 1697 1698 if (rdev->supply) 1699 while (rdev->open_count--) 1700 regulator_disable(rdev->supply); 1701 1702 return ret; 1703} 1704EXPORT_SYMBOL_GPL(regulator_force_disable); 1705 1706static void regulator_disable_work(struct work_struct *work) 1707{ 1708 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1709 disable_work.work); 1710 int count, i, ret; 1711 1712 mutex_lock(&rdev->mutex); 1713 1714 BUG_ON(!rdev->deferred_disables); 1715 1716 count = rdev->deferred_disables; 1717 rdev->deferred_disables = 0; 1718 1719 for (i = 0; i < count; i++) { 1720 ret = _regulator_disable(rdev); 1721 if (ret != 0) 1722 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1723 } 1724 1725 mutex_unlock(&rdev->mutex); 1726 1727 if (rdev->supply) { 1728 for (i = 0; i < count; i++) { 1729 ret = regulator_disable(rdev->supply); 1730 if (ret != 0) { 1731 rdev_err(rdev, 1732 "Supply disable failed: %d\n", ret); 1733 } 1734 } 1735 } 1736} 1737 1738/** 1739 * regulator_disable_deferred - disable regulator output with delay 1740 * @regulator: regulator source 1741 * @ms: miliseconds until the regulator is disabled 1742 * 1743 * Execute regulator_disable() on the regulator after a delay. This 1744 * is intended for use with devices that require some time to quiesce. 1745 * 1746 * NOTE: this will only disable the regulator output if no other consumer 1747 * devices have it enabled, the regulator device supports disabling and 1748 * machine constraints permit this operation. 1749 */ 1750int regulator_disable_deferred(struct regulator *regulator, int ms) 1751{ 1752 struct regulator_dev *rdev = regulator->rdev; 1753 int ret; 1754 1755 if (regulator->always_on) 1756 return 0; 1757 1758 if (!ms) 1759 return regulator_disable(regulator); 1760 1761 mutex_lock(&rdev->mutex); 1762 rdev->deferred_disables++; 1763 mutex_unlock(&rdev->mutex); 1764 1765 ret = schedule_delayed_work(&rdev->disable_work, 1766 msecs_to_jiffies(ms)); 1767 if (ret < 0) 1768 return ret; 1769 else 1770 return 0; 1771} 1772EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1773 1774/** 1775 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1776 * 1777 * @rdev: regulator to operate on 1778 * 1779 * Regulators that use regmap for their register I/O can set the 1780 * enable_reg and enable_mask fields in their descriptor and then use 1781 * this as their is_enabled operation, saving some code. 1782 */ 1783int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1784{ 1785 unsigned int val; 1786 int ret; 1787 1788 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1789 if (ret != 0) 1790 return ret; 1791 1792 return (val & rdev->desc->enable_mask) != 0; 1793} 1794EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1795 1796/** 1797 * regulator_enable_regmap - standard enable() for regmap users 1798 * 1799 * @rdev: regulator to operate on 1800 * 1801 * Regulators that use regmap for their register I/O can set the 1802 * enable_reg and enable_mask fields in their descriptor and then use 1803 * this as their enable() operation, saving some code. 1804 */ 1805int regulator_enable_regmap(struct regulator_dev *rdev) 1806{ 1807 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1808 rdev->desc->enable_mask, 1809 rdev->desc->enable_mask); 1810} 1811EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1812 1813/** 1814 * regulator_disable_regmap - standard disable() for regmap users 1815 * 1816 * @rdev: regulator to operate on 1817 * 1818 * Regulators that use regmap for their register I/O can set the 1819 * enable_reg and enable_mask fields in their descriptor and then use 1820 * this as their disable() operation, saving some code. 1821 */ 1822int regulator_disable_regmap(struct regulator_dev *rdev) 1823{ 1824 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1825 rdev->desc->enable_mask, 0); 1826} 1827EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1828 1829static int _regulator_is_enabled(struct regulator_dev *rdev) 1830{ 1831 /* A GPIO control always takes precedence */ 1832 if (rdev->ena_gpio) 1833 return rdev->ena_gpio_state; 1834 1835 /* If we don't know then assume that the regulator is always on */ 1836 if (!rdev->desc->ops->is_enabled) 1837 return 1; 1838 1839 return rdev->desc->ops->is_enabled(rdev); 1840} 1841 1842/** 1843 * regulator_is_enabled - is the regulator output enabled 1844 * @regulator: regulator source 1845 * 1846 * Returns positive if the regulator driver backing the source/client 1847 * has requested that the device be enabled, zero if it hasn't, else a 1848 * negative errno code. 1849 * 1850 * Note that the device backing this regulator handle can have multiple 1851 * users, so it might be enabled even if regulator_enable() was never 1852 * called for this particular source. 1853 */ 1854int regulator_is_enabled(struct regulator *regulator) 1855{ 1856 int ret; 1857 1858 if (regulator->always_on) 1859 return 1; 1860 1861 mutex_lock(®ulator->rdev->mutex); 1862 ret = _regulator_is_enabled(regulator->rdev); 1863 mutex_unlock(®ulator->rdev->mutex); 1864 1865 return ret; 1866} 1867EXPORT_SYMBOL_GPL(regulator_is_enabled); 1868 1869/** 1870 * regulator_can_change_voltage - check if regulator can change voltage 1871 * @regulator: regulator source 1872 * 1873 * Returns positive if the regulator driver backing the source/client 1874 * can change its voltage, false otherwise. Usefull for detecting fixed 1875 * or dummy regulators and disabling voltage change logic in the client 1876 * driver. 1877 */ 1878int regulator_can_change_voltage(struct regulator *regulator) 1879{ 1880 struct regulator_dev *rdev = regulator->rdev; 1881 1882 if (rdev->constraints && 1883 rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE && 1884 rdev->desc->n_voltages > 1) 1885 return 1; 1886 1887 return 0; 1888} 1889EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 1890 1891/** 1892 * regulator_count_voltages - count regulator_list_voltage() selectors 1893 * @regulator: regulator source 1894 * 1895 * Returns number of selectors, or negative errno. Selectors are 1896 * numbered starting at zero, and typically correspond to bitfields 1897 * in hardware registers. 1898 */ 1899int regulator_count_voltages(struct regulator *regulator) 1900{ 1901 struct regulator_dev *rdev = regulator->rdev; 1902 1903 return rdev->desc->n_voltages ? : -EINVAL; 1904} 1905EXPORT_SYMBOL_GPL(regulator_count_voltages); 1906 1907/** 1908 * regulator_list_voltage_linear - List voltages with simple calculation 1909 * 1910 * @rdev: Regulator device 1911 * @selector: Selector to convert into a voltage 1912 * 1913 * Regulators with a simple linear mapping between voltages and 1914 * selectors can set min_uV and uV_step in the regulator descriptor 1915 * and then use this function as their list_voltage() operation, 1916 */ 1917int regulator_list_voltage_linear(struct regulator_dev *rdev, 1918 unsigned int selector) 1919{ 1920 if (selector >= rdev->desc->n_voltages) 1921 return -EINVAL; 1922 1923 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1924} 1925EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1926 1927/** 1928 * regulator_list_voltage_table - List voltages with table based mapping 1929 * 1930 * @rdev: Regulator device 1931 * @selector: Selector to convert into a voltage 1932 * 1933 * Regulators with table based mapping between voltages and 1934 * selectors can set volt_table in the regulator descriptor 1935 * and then use this function as their list_voltage() operation. 1936 */ 1937int regulator_list_voltage_table(struct regulator_dev *rdev, 1938 unsigned int selector) 1939{ 1940 if (!rdev->desc->volt_table) { 1941 BUG_ON(!rdev->desc->volt_table); 1942 return -EINVAL; 1943 } 1944 1945 if (selector >= rdev->desc->n_voltages) 1946 return -EINVAL; 1947 1948 return rdev->desc->volt_table[selector]; 1949} 1950EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1951 1952/** 1953 * regulator_list_voltage - enumerate supported voltages 1954 * @regulator: regulator source 1955 * @selector: identify voltage to list 1956 * Context: can sleep 1957 * 1958 * Returns a voltage that can be passed to @regulator_set_voltage(), 1959 * zero if this selector code can't be used on this system, or a 1960 * negative errno. 1961 */ 1962int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1963{ 1964 struct regulator_dev *rdev = regulator->rdev; 1965 struct regulator_ops *ops = rdev->desc->ops; 1966 int ret; 1967 1968 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1969 return -EINVAL; 1970 1971 mutex_lock(&rdev->mutex); 1972 ret = ops->list_voltage(rdev, selector); 1973 mutex_unlock(&rdev->mutex); 1974 1975 if (ret > 0) { 1976 if (ret < rdev->constraints->min_uV) 1977 ret = 0; 1978 else if (ret > rdev->constraints->max_uV) 1979 ret = 0; 1980 } 1981 1982 return ret; 1983} 1984EXPORT_SYMBOL_GPL(regulator_list_voltage); 1985 1986/** 1987 * regulator_is_supported_voltage - check if a voltage range can be supported 1988 * 1989 * @regulator: Regulator to check. 1990 * @min_uV: Minimum required voltage in uV. 1991 * @max_uV: Maximum required voltage in uV. 1992 * 1993 * Returns a boolean or a negative error code. 1994 */ 1995int regulator_is_supported_voltage(struct regulator *regulator, 1996 int min_uV, int max_uV) 1997{ 1998 struct regulator_dev *rdev = regulator->rdev; 1999 int i, voltages, ret; 2000 2001 /* If we can't change voltage check the current voltage */ 2002 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2003 ret = regulator_get_voltage(regulator); 2004 if (ret >= 0) 2005 return (min_uV <= ret && ret <= max_uV); 2006 else 2007 return ret; 2008 } 2009 2010 ret = regulator_count_voltages(regulator); 2011 if (ret < 0) 2012 return ret; 2013 voltages = ret; 2014 2015 for (i = 0; i < voltages; i++) { 2016 ret = regulator_list_voltage(regulator, i); 2017 2018 if (ret >= min_uV && ret <= max_uV) 2019 return 1; 2020 } 2021 2022 return 0; 2023} 2024EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2025 2026/** 2027 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2028 * 2029 * @rdev: regulator to operate on 2030 * 2031 * Regulators that use regmap for their register I/O can set the 2032 * vsel_reg and vsel_mask fields in their descriptor and then use this 2033 * as their get_voltage_vsel operation, saving some code. 2034 */ 2035int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2036{ 2037 unsigned int val; 2038 int ret; 2039 2040 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2041 if (ret != 0) 2042 return ret; 2043 2044 val &= rdev->desc->vsel_mask; 2045 val >>= ffs(rdev->desc->vsel_mask) - 1; 2046 2047 return val; 2048} 2049EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2050 2051/** 2052 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2053 * 2054 * @rdev: regulator to operate on 2055 * @sel: Selector to set 2056 * 2057 * Regulators that use regmap for their register I/O can set the 2058 * vsel_reg and vsel_mask fields in their descriptor and then use this 2059 * as their set_voltage_vsel operation, saving some code. 2060 */ 2061int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2062{ 2063 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2064 2065 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2066 rdev->desc->vsel_mask, sel); 2067} 2068EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2069 2070/** 2071 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2072 * 2073 * @rdev: Regulator to operate on 2074 * @min_uV: Lower bound for voltage 2075 * @max_uV: Upper bound for voltage 2076 * 2077 * Drivers implementing set_voltage_sel() and list_voltage() can use 2078 * this as their map_voltage() operation. It will find a suitable 2079 * voltage by calling list_voltage() until it gets something in bounds 2080 * for the requested voltages. 2081 */ 2082int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2083 int min_uV, int max_uV) 2084{ 2085 int best_val = INT_MAX; 2086 int selector = 0; 2087 int i, ret; 2088 2089 /* Find the smallest voltage that falls within the specified 2090 * range. 2091 */ 2092 for (i = 0; i < rdev->desc->n_voltages; i++) { 2093 ret = rdev->desc->ops->list_voltage(rdev, i); 2094 if (ret < 0) 2095 continue; 2096 2097 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2098 best_val = ret; 2099 selector = i; 2100 } 2101 } 2102 2103 if (best_val != INT_MAX) 2104 return selector; 2105 else 2106 return -EINVAL; 2107} 2108EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2109 2110/** 2111 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2112 * 2113 * @rdev: Regulator to operate on 2114 * @min_uV: Lower bound for voltage 2115 * @max_uV: Upper bound for voltage 2116 * 2117 * Drivers providing min_uV and uV_step in their regulator_desc can 2118 * use this as their map_voltage() operation. 2119 */ 2120int regulator_map_voltage_linear(struct regulator_dev *rdev, 2121 int min_uV, int max_uV) 2122{ 2123 int ret, voltage; 2124 2125 /* Allow uV_step to be 0 for fixed voltage */ 2126 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2127 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2128 return 0; 2129 else 2130 return -EINVAL; 2131 } 2132 2133 if (!rdev->desc->uV_step) { 2134 BUG_ON(!rdev->desc->uV_step); 2135 return -EINVAL; 2136 } 2137 2138 if (min_uV < rdev->desc->min_uV) 2139 min_uV = rdev->desc->min_uV; 2140 2141 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2142 if (ret < 0) 2143 return ret; 2144 2145 /* Map back into a voltage to verify we're still in bounds */ 2146 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2147 if (voltage < min_uV || voltage > max_uV) 2148 return -EINVAL; 2149 2150 return ret; 2151} 2152EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2153 2154static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2155 int min_uV, int max_uV) 2156{ 2157 int ret; 2158 int delay = 0; 2159 int best_val = 0; 2160 unsigned int selector; 2161 int old_selector = -1; 2162 2163 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2164 2165 min_uV += rdev->constraints->uV_offset; 2166 max_uV += rdev->constraints->uV_offset; 2167 2168 /* 2169 * If we can't obtain the old selector there is not enough 2170 * info to call set_voltage_time_sel(). 2171 */ 2172 if (_regulator_is_enabled(rdev) && 2173 rdev->desc->ops->set_voltage_time_sel && 2174 rdev->desc->ops->get_voltage_sel) { 2175 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2176 if (old_selector < 0) 2177 return old_selector; 2178 } 2179 2180 if (rdev->desc->ops->set_voltage) { 2181 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2182 &selector); 2183 2184 if (ret >= 0) { 2185 if (rdev->desc->ops->list_voltage) 2186 best_val = rdev->desc->ops->list_voltage(rdev, 2187 selector); 2188 else 2189 best_val = _regulator_get_voltage(rdev); 2190 } 2191 2192 } else if (rdev->desc->ops->set_voltage_sel) { 2193 if (rdev->desc->ops->map_voltage) { 2194 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2195 max_uV); 2196 } else { 2197 if (rdev->desc->ops->list_voltage == 2198 regulator_list_voltage_linear) 2199 ret = regulator_map_voltage_linear(rdev, 2200 min_uV, max_uV); 2201 else 2202 ret = regulator_map_voltage_iterate(rdev, 2203 min_uV, max_uV); 2204 } 2205 2206 if (ret >= 0) { 2207 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2208 if (min_uV <= best_val && max_uV >= best_val) { 2209 selector = ret; 2210 ret = rdev->desc->ops->set_voltage_sel(rdev, 2211 ret); 2212 } else { 2213 ret = -EINVAL; 2214 } 2215 } 2216 } else { 2217 ret = -EINVAL; 2218 } 2219 2220 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2221 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2222 rdev->desc->ops->set_voltage_time_sel) { 2223 2224 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2225 old_selector, selector); 2226 if (delay < 0) { 2227 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2228 delay); 2229 delay = 0; 2230 } 2231 2232 /* Insert any necessary delays */ 2233 if (delay >= 1000) { 2234 mdelay(delay / 1000); 2235 udelay(delay % 1000); 2236 } else if (delay) { 2237 udelay(delay); 2238 } 2239 } 2240 2241 if (ret == 0 && best_val >= 0) { 2242 unsigned long data = best_val; 2243 2244 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2245 (void *)data); 2246 } 2247 2248 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2249 2250 return ret; 2251} 2252 2253/** 2254 * regulator_set_voltage - set regulator output voltage 2255 * @regulator: regulator source 2256 * @min_uV: Minimum required voltage in uV 2257 * @max_uV: Maximum acceptable voltage in uV 2258 * 2259 * Sets a voltage regulator to the desired output voltage. This can be set 2260 * during any regulator state. IOW, regulator can be disabled or enabled. 2261 * 2262 * If the regulator is enabled then the voltage will change to the new value 2263 * immediately otherwise if the regulator is disabled the regulator will 2264 * output at the new voltage when enabled. 2265 * 2266 * NOTE: If the regulator is shared between several devices then the lowest 2267 * request voltage that meets the system constraints will be used. 2268 * Regulator system constraints must be set for this regulator before 2269 * calling this function otherwise this call will fail. 2270 */ 2271int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2272{ 2273 struct regulator_dev *rdev = regulator->rdev; 2274 int ret = 0; 2275 2276 mutex_lock(&rdev->mutex); 2277 2278 /* If we're setting the same range as last time the change 2279 * should be a noop (some cpufreq implementations use the same 2280 * voltage for multiple frequencies, for example). 2281 */ 2282 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2283 goto out; 2284 2285 /* sanity check */ 2286 if (!rdev->desc->ops->set_voltage && 2287 !rdev->desc->ops->set_voltage_sel) { 2288 ret = -EINVAL; 2289 goto out; 2290 } 2291 2292 /* constraints check */ 2293 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2294 if (ret < 0) 2295 goto out; 2296 regulator->min_uV = min_uV; 2297 regulator->max_uV = max_uV; 2298 2299 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2300 if (ret < 0) 2301 goto out; 2302 2303 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2304 2305out: 2306 mutex_unlock(&rdev->mutex); 2307 return ret; 2308} 2309EXPORT_SYMBOL_GPL(regulator_set_voltage); 2310 2311/** 2312 * regulator_set_voltage_time - get raise/fall time 2313 * @regulator: regulator source 2314 * @old_uV: starting voltage in microvolts 2315 * @new_uV: target voltage in microvolts 2316 * 2317 * Provided with the starting and ending voltage, this function attempts to 2318 * calculate the time in microseconds required to rise or fall to this new 2319 * voltage. 2320 */ 2321int regulator_set_voltage_time(struct regulator *regulator, 2322 int old_uV, int new_uV) 2323{ 2324 struct regulator_dev *rdev = regulator->rdev; 2325 struct regulator_ops *ops = rdev->desc->ops; 2326 int old_sel = -1; 2327 int new_sel = -1; 2328 int voltage; 2329 int i; 2330 2331 /* Currently requires operations to do this */ 2332 if (!ops->list_voltage || !ops->set_voltage_time_sel 2333 || !rdev->desc->n_voltages) 2334 return -EINVAL; 2335 2336 for (i = 0; i < rdev->desc->n_voltages; i++) { 2337 /* We only look for exact voltage matches here */ 2338 voltage = regulator_list_voltage(regulator, i); 2339 if (voltage < 0) 2340 return -EINVAL; 2341 if (voltage == 0) 2342 continue; 2343 if (voltage == old_uV) 2344 old_sel = i; 2345 if (voltage == new_uV) 2346 new_sel = i; 2347 } 2348 2349 if (old_sel < 0 || new_sel < 0) 2350 return -EINVAL; 2351 2352 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2353} 2354EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2355 2356/** 2357 * regulator_set_voltage_time_sel - get raise/fall time 2358 * @rdev: regulator source device 2359 * @old_selector: selector for starting voltage 2360 * @new_selector: selector for target voltage 2361 * 2362 * Provided with the starting and target voltage selectors, this function 2363 * returns time in microseconds required to rise or fall to this new voltage 2364 * 2365 * Drivers providing ramp_delay in regulation_constraints can use this as their 2366 * set_voltage_time_sel() operation. 2367 */ 2368int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2369 unsigned int old_selector, 2370 unsigned int new_selector) 2371{ 2372 unsigned int ramp_delay = 0; 2373 int old_volt, new_volt; 2374 2375 if (rdev->constraints->ramp_delay) 2376 ramp_delay = rdev->constraints->ramp_delay; 2377 else if (rdev->desc->ramp_delay) 2378 ramp_delay = rdev->desc->ramp_delay; 2379 2380 if (ramp_delay == 0) { 2381 rdev_warn(rdev, "ramp_delay not set\n"); 2382 return 0; 2383 } 2384 2385 /* sanity check */ 2386 if (!rdev->desc->ops->list_voltage) 2387 return -EINVAL; 2388 2389 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2390 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2391 2392 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2393} 2394EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2395 2396/** 2397 * regulator_sync_voltage - re-apply last regulator output voltage 2398 * @regulator: regulator source 2399 * 2400 * Re-apply the last configured voltage. This is intended to be used 2401 * where some external control source the consumer is cooperating with 2402 * has caused the configured voltage to change. 2403 */ 2404int regulator_sync_voltage(struct regulator *regulator) 2405{ 2406 struct regulator_dev *rdev = regulator->rdev; 2407 int ret, min_uV, max_uV; 2408 2409 mutex_lock(&rdev->mutex); 2410 2411 if (!rdev->desc->ops->set_voltage && 2412 !rdev->desc->ops->set_voltage_sel) { 2413 ret = -EINVAL; 2414 goto out; 2415 } 2416 2417 /* This is only going to work if we've had a voltage configured. */ 2418 if (!regulator->min_uV && !regulator->max_uV) { 2419 ret = -EINVAL; 2420 goto out; 2421 } 2422 2423 min_uV = regulator->min_uV; 2424 max_uV = regulator->max_uV; 2425 2426 /* This should be a paranoia check... */ 2427 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2428 if (ret < 0) 2429 goto out; 2430 2431 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2432 if (ret < 0) 2433 goto out; 2434 2435 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2436 2437out: 2438 mutex_unlock(&rdev->mutex); 2439 return ret; 2440} 2441EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2442 2443static int _regulator_get_voltage(struct regulator_dev *rdev) 2444{ 2445 int sel, ret; 2446 2447 if (rdev->desc->ops->get_voltage_sel) { 2448 sel = rdev->desc->ops->get_voltage_sel(rdev); 2449 if (sel < 0) 2450 return sel; 2451 ret = rdev->desc->ops->list_voltage(rdev, sel); 2452 } else if (rdev->desc->ops->get_voltage) { 2453 ret = rdev->desc->ops->get_voltage(rdev); 2454 } else if (rdev->desc->ops->list_voltage) { 2455 ret = rdev->desc->ops->list_voltage(rdev, 0); 2456 } else { 2457 return -EINVAL; 2458 } 2459 2460 if (ret < 0) 2461 return ret; 2462 return ret - rdev->constraints->uV_offset; 2463} 2464 2465/** 2466 * regulator_get_voltage - get regulator output voltage 2467 * @regulator: regulator source 2468 * 2469 * This returns the current regulator voltage in uV. 2470 * 2471 * NOTE: If the regulator is disabled it will return the voltage value. This 2472 * function should not be used to determine regulator state. 2473 */ 2474int regulator_get_voltage(struct regulator *regulator) 2475{ 2476 int ret; 2477 2478 mutex_lock(®ulator->rdev->mutex); 2479 2480 ret = _regulator_get_voltage(regulator->rdev); 2481 2482 mutex_unlock(®ulator->rdev->mutex); 2483 2484 return ret; 2485} 2486EXPORT_SYMBOL_GPL(regulator_get_voltage); 2487 2488/** 2489 * regulator_set_current_limit - set regulator output current limit 2490 * @regulator: regulator source 2491 * @min_uA: Minimuum supported current in uA 2492 * @max_uA: Maximum supported current in uA 2493 * 2494 * Sets current sink to the desired output current. This can be set during 2495 * any regulator state. IOW, regulator can be disabled or enabled. 2496 * 2497 * If the regulator is enabled then the current will change to the new value 2498 * immediately otherwise if the regulator is disabled the regulator will 2499 * output at the new current when enabled. 2500 * 2501 * NOTE: Regulator system constraints must be set for this regulator before 2502 * calling this function otherwise this call will fail. 2503 */ 2504int regulator_set_current_limit(struct regulator *regulator, 2505 int min_uA, int max_uA) 2506{ 2507 struct regulator_dev *rdev = regulator->rdev; 2508 int ret; 2509 2510 mutex_lock(&rdev->mutex); 2511 2512 /* sanity check */ 2513 if (!rdev->desc->ops->set_current_limit) { 2514 ret = -EINVAL; 2515 goto out; 2516 } 2517 2518 /* constraints check */ 2519 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2520 if (ret < 0) 2521 goto out; 2522 2523 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2524out: 2525 mutex_unlock(&rdev->mutex); 2526 return ret; 2527} 2528EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2529 2530static int _regulator_get_current_limit(struct regulator_dev *rdev) 2531{ 2532 int ret; 2533 2534 mutex_lock(&rdev->mutex); 2535 2536 /* sanity check */ 2537 if (!rdev->desc->ops->get_current_limit) { 2538 ret = -EINVAL; 2539 goto out; 2540 } 2541 2542 ret = rdev->desc->ops->get_current_limit(rdev); 2543out: 2544 mutex_unlock(&rdev->mutex); 2545 return ret; 2546} 2547 2548/** 2549 * regulator_get_current_limit - get regulator output current 2550 * @regulator: regulator source 2551 * 2552 * This returns the current supplied by the specified current sink in uA. 2553 * 2554 * NOTE: If the regulator is disabled it will return the current value. This 2555 * function should not be used to determine regulator state. 2556 */ 2557int regulator_get_current_limit(struct regulator *regulator) 2558{ 2559 return _regulator_get_current_limit(regulator->rdev); 2560} 2561EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2562 2563/** 2564 * regulator_set_mode - set regulator operating mode 2565 * @regulator: regulator source 2566 * @mode: operating mode - one of the REGULATOR_MODE constants 2567 * 2568 * Set regulator operating mode to increase regulator efficiency or improve 2569 * regulation performance. 2570 * 2571 * NOTE: Regulator system constraints must be set for this regulator before 2572 * calling this function otherwise this call will fail. 2573 */ 2574int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2575{ 2576 struct regulator_dev *rdev = regulator->rdev; 2577 int ret; 2578 int regulator_curr_mode; 2579 2580 mutex_lock(&rdev->mutex); 2581 2582 /* sanity check */ 2583 if (!rdev->desc->ops->set_mode) { 2584 ret = -EINVAL; 2585 goto out; 2586 } 2587 2588 /* return if the same mode is requested */ 2589 if (rdev->desc->ops->get_mode) { 2590 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2591 if (regulator_curr_mode == mode) { 2592 ret = 0; 2593 goto out; 2594 } 2595 } 2596 2597 /* constraints check */ 2598 ret = regulator_mode_constrain(rdev, &mode); 2599 if (ret < 0) 2600 goto out; 2601 2602 ret = rdev->desc->ops->set_mode(rdev, mode); 2603out: 2604 mutex_unlock(&rdev->mutex); 2605 return ret; 2606} 2607EXPORT_SYMBOL_GPL(regulator_set_mode); 2608 2609static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2610{ 2611 int ret; 2612 2613 mutex_lock(&rdev->mutex); 2614 2615 /* sanity check */ 2616 if (!rdev->desc->ops->get_mode) { 2617 ret = -EINVAL; 2618 goto out; 2619 } 2620 2621 ret = rdev->desc->ops->get_mode(rdev); 2622out: 2623 mutex_unlock(&rdev->mutex); 2624 return ret; 2625} 2626 2627/** 2628 * regulator_get_mode - get regulator operating mode 2629 * @regulator: regulator source 2630 * 2631 * Get the current regulator operating mode. 2632 */ 2633unsigned int regulator_get_mode(struct regulator *regulator) 2634{ 2635 return _regulator_get_mode(regulator->rdev); 2636} 2637EXPORT_SYMBOL_GPL(regulator_get_mode); 2638 2639/** 2640 * regulator_set_optimum_mode - set regulator optimum operating mode 2641 * @regulator: regulator source 2642 * @uA_load: load current 2643 * 2644 * Notifies the regulator core of a new device load. This is then used by 2645 * DRMS (if enabled by constraints) to set the most efficient regulator 2646 * operating mode for the new regulator loading. 2647 * 2648 * Consumer devices notify their supply regulator of the maximum power 2649 * they will require (can be taken from device datasheet in the power 2650 * consumption tables) when they change operational status and hence power 2651 * state. Examples of operational state changes that can affect power 2652 * consumption are :- 2653 * 2654 * o Device is opened / closed. 2655 * o Device I/O is about to begin or has just finished. 2656 * o Device is idling in between work. 2657 * 2658 * This information is also exported via sysfs to userspace. 2659 * 2660 * DRMS will sum the total requested load on the regulator and change 2661 * to the most efficient operating mode if platform constraints allow. 2662 * 2663 * Returns the new regulator mode or error. 2664 */ 2665int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2666{ 2667 struct regulator_dev *rdev = regulator->rdev; 2668 struct regulator *consumer; 2669 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2670 unsigned int mode; 2671 2672 if (rdev->supply) 2673 input_uV = regulator_get_voltage(rdev->supply); 2674 2675 mutex_lock(&rdev->mutex); 2676 2677 /* 2678 * first check to see if we can set modes at all, otherwise just 2679 * tell the consumer everything is OK. 2680 */ 2681 regulator->uA_load = uA_load; 2682 ret = regulator_check_drms(rdev); 2683 if (ret < 0) { 2684 ret = 0; 2685 goto out; 2686 } 2687 2688 if (!rdev->desc->ops->get_optimum_mode) 2689 goto out; 2690 2691 /* 2692 * we can actually do this so any errors are indicators of 2693 * potential real failure. 2694 */ 2695 ret = -EINVAL; 2696 2697 if (!rdev->desc->ops->set_mode) 2698 goto out; 2699 2700 /* get output voltage */ 2701 output_uV = _regulator_get_voltage(rdev); 2702 if (output_uV <= 0) { 2703 rdev_err(rdev, "invalid output voltage found\n"); 2704 goto out; 2705 } 2706 2707 /* No supply? Use constraint voltage */ 2708 if (input_uV <= 0) 2709 input_uV = rdev->constraints->input_uV; 2710 if (input_uV <= 0) { 2711 rdev_err(rdev, "invalid input voltage found\n"); 2712 goto out; 2713 } 2714 2715 /* calc total requested load for this regulator */ 2716 list_for_each_entry(consumer, &rdev->consumer_list, list) 2717 total_uA_load += consumer->uA_load; 2718 2719 mode = rdev->desc->ops->get_optimum_mode(rdev, 2720 input_uV, output_uV, 2721 total_uA_load); 2722 ret = regulator_mode_constrain(rdev, &mode); 2723 if (ret < 0) { 2724 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2725 total_uA_load, input_uV, output_uV); 2726 goto out; 2727 } 2728 2729 ret = rdev->desc->ops->set_mode(rdev, mode); 2730 if (ret < 0) { 2731 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2732 goto out; 2733 } 2734 ret = mode; 2735out: 2736 mutex_unlock(&rdev->mutex); 2737 return ret; 2738} 2739EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2740 2741/** 2742 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2743 * 2744 * @rdev: device to operate on. 2745 * @enable: state to set. 2746 */ 2747int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2748{ 2749 unsigned int val; 2750 2751 if (enable) 2752 val = rdev->desc->bypass_mask; 2753 else 2754 val = 0; 2755 2756 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2757 rdev->desc->bypass_mask, val); 2758} 2759EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2760 2761/** 2762 * regulator_get_bypass_regmap - Default get_bypass() using regmap 2763 * 2764 * @rdev: device to operate on. 2765 * @enable: current state. 2766 */ 2767int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 2768{ 2769 unsigned int val; 2770 int ret; 2771 2772 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 2773 if (ret != 0) 2774 return ret; 2775 2776 *enable = val & rdev->desc->bypass_mask; 2777 2778 return 0; 2779} 2780EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 2781 2782/** 2783 * regulator_allow_bypass - allow the regulator to go into bypass mode 2784 * 2785 * @regulator: Regulator to configure 2786 * @allow: enable or disable bypass mode 2787 * 2788 * Allow the regulator to go into bypass mode if all other consumers 2789 * for the regulator also enable bypass mode and the machine 2790 * constraints allow this. Bypass mode means that the regulator is 2791 * simply passing the input directly to the output with no regulation. 2792 */ 2793int regulator_allow_bypass(struct regulator *regulator, bool enable) 2794{ 2795 struct regulator_dev *rdev = regulator->rdev; 2796 int ret = 0; 2797 2798 if (!rdev->desc->ops->set_bypass) 2799 return 0; 2800 2801 if (rdev->constraints && 2802 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2803 return 0; 2804 2805 mutex_lock(&rdev->mutex); 2806 2807 if (enable && !regulator->bypass) { 2808 rdev->bypass_count++; 2809 2810 if (rdev->bypass_count == rdev->open_count) { 2811 ret = rdev->desc->ops->set_bypass(rdev, enable); 2812 if (ret != 0) 2813 rdev->bypass_count--; 2814 } 2815 2816 } else if (!enable && regulator->bypass) { 2817 rdev->bypass_count--; 2818 2819 if (rdev->bypass_count != rdev->open_count) { 2820 ret = rdev->desc->ops->set_bypass(rdev, enable); 2821 if (ret != 0) 2822 rdev->bypass_count++; 2823 } 2824 } 2825 2826 if (ret == 0) 2827 regulator->bypass = enable; 2828 2829 mutex_unlock(&rdev->mutex); 2830 2831 return ret; 2832} 2833EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2834 2835/** 2836 * regulator_register_notifier - register regulator event notifier 2837 * @regulator: regulator source 2838 * @nb: notifier block 2839 * 2840 * Register notifier block to receive regulator events. 2841 */ 2842int regulator_register_notifier(struct regulator *regulator, 2843 struct notifier_block *nb) 2844{ 2845 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2846 nb); 2847} 2848EXPORT_SYMBOL_GPL(regulator_register_notifier); 2849 2850/** 2851 * regulator_unregister_notifier - unregister regulator event notifier 2852 * @regulator: regulator source 2853 * @nb: notifier block 2854 * 2855 * Unregister regulator event notifier block. 2856 */ 2857int regulator_unregister_notifier(struct regulator *regulator, 2858 struct notifier_block *nb) 2859{ 2860 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2861 nb); 2862} 2863EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2864 2865/* notify regulator consumers and downstream regulator consumers. 2866 * Note mutex must be held by caller. 2867 */ 2868static void _notifier_call_chain(struct regulator_dev *rdev, 2869 unsigned long event, void *data) 2870{ 2871 /* call rdev chain first */ 2872 blocking_notifier_call_chain(&rdev->notifier, event, data); 2873} 2874 2875/** 2876 * regulator_bulk_get - get multiple regulator consumers 2877 * 2878 * @dev: Device to supply 2879 * @num_consumers: Number of consumers to register 2880 * @consumers: Configuration of consumers; clients are stored here. 2881 * 2882 * @return 0 on success, an errno on failure. 2883 * 2884 * This helper function allows drivers to get several regulator 2885 * consumers in one operation. If any of the regulators cannot be 2886 * acquired then any regulators that were allocated will be freed 2887 * before returning to the caller. 2888 */ 2889int regulator_bulk_get(struct device *dev, int num_consumers, 2890 struct regulator_bulk_data *consumers) 2891{ 2892 int i; 2893 int ret; 2894 2895 for (i = 0; i < num_consumers; i++) 2896 consumers[i].consumer = NULL; 2897 2898 for (i = 0; i < num_consumers; i++) { 2899 consumers[i].consumer = regulator_get(dev, 2900 consumers[i].supply); 2901 if (IS_ERR(consumers[i].consumer)) { 2902 ret = PTR_ERR(consumers[i].consumer); 2903 dev_err(dev, "Failed to get supply '%s': %d\n", 2904 consumers[i].supply, ret); 2905 consumers[i].consumer = NULL; 2906 goto err; 2907 } 2908 } 2909 2910 return 0; 2911 2912err: 2913 while (--i >= 0) 2914 regulator_put(consumers[i].consumer); 2915 2916 return ret; 2917} 2918EXPORT_SYMBOL_GPL(regulator_bulk_get); 2919 2920/** 2921 * devm_regulator_bulk_get - managed get multiple regulator consumers 2922 * 2923 * @dev: Device to supply 2924 * @num_consumers: Number of consumers to register 2925 * @consumers: Configuration of consumers; clients are stored here. 2926 * 2927 * @return 0 on success, an errno on failure. 2928 * 2929 * This helper function allows drivers to get several regulator 2930 * consumers in one operation with management, the regulators will 2931 * automatically be freed when the device is unbound. If any of the 2932 * regulators cannot be acquired then any regulators that were 2933 * allocated will be freed before returning to the caller. 2934 */ 2935int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2936 struct regulator_bulk_data *consumers) 2937{ 2938 int i; 2939 int ret; 2940 2941 for (i = 0; i < num_consumers; i++) 2942 consumers[i].consumer = NULL; 2943 2944 for (i = 0; i < num_consumers; i++) { 2945 consumers[i].consumer = devm_regulator_get(dev, 2946 consumers[i].supply); 2947 if (IS_ERR(consumers[i].consumer)) { 2948 ret = PTR_ERR(consumers[i].consumer); 2949 dev_err(dev, "Failed to get supply '%s': %d\n", 2950 consumers[i].supply, ret); 2951 consumers[i].consumer = NULL; 2952 goto err; 2953 } 2954 } 2955 2956 return 0; 2957 2958err: 2959 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2960 devm_regulator_put(consumers[i].consumer); 2961 2962 return ret; 2963} 2964EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2965 2966static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2967{ 2968 struct regulator_bulk_data *bulk = data; 2969 2970 bulk->ret = regulator_enable(bulk->consumer); 2971} 2972 2973/** 2974 * regulator_bulk_enable - enable multiple regulator consumers 2975 * 2976 * @num_consumers: Number of consumers 2977 * @consumers: Consumer data; clients are stored here. 2978 * @return 0 on success, an errno on failure 2979 * 2980 * This convenience API allows consumers to enable multiple regulator 2981 * clients in a single API call. If any consumers cannot be enabled 2982 * then any others that were enabled will be disabled again prior to 2983 * return. 2984 */ 2985int regulator_bulk_enable(int num_consumers, 2986 struct regulator_bulk_data *consumers) 2987{ 2988 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2989 int i; 2990 int ret = 0; 2991 2992 for (i = 0; i < num_consumers; i++) { 2993 if (consumers[i].consumer->always_on) 2994 consumers[i].ret = 0; 2995 else 2996 async_schedule_domain(regulator_bulk_enable_async, 2997 &consumers[i], &async_domain); 2998 } 2999 3000 async_synchronize_full_domain(&async_domain); 3001 3002 /* If any consumer failed we need to unwind any that succeeded */ 3003 for (i = 0; i < num_consumers; i++) { 3004 if (consumers[i].ret != 0) { 3005 ret = consumers[i].ret; 3006 goto err; 3007 } 3008 } 3009 3010 return 0; 3011 3012err: 3013 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 3014 while (--i >= 0) 3015 regulator_disable(consumers[i].consumer); 3016 3017 return ret; 3018} 3019EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3020 3021/** 3022 * regulator_bulk_disable - disable multiple regulator consumers 3023 * 3024 * @num_consumers: Number of consumers 3025 * @consumers: Consumer data; clients are stored here. 3026 * @return 0 on success, an errno on failure 3027 * 3028 * This convenience API allows consumers to disable multiple regulator 3029 * clients in a single API call. If any consumers cannot be disabled 3030 * then any others that were disabled will be enabled again prior to 3031 * return. 3032 */ 3033int regulator_bulk_disable(int num_consumers, 3034 struct regulator_bulk_data *consumers) 3035{ 3036 int i; 3037 int ret, r; 3038 3039 for (i = num_consumers - 1; i >= 0; --i) { 3040 ret = regulator_disable(consumers[i].consumer); 3041 if (ret != 0) 3042 goto err; 3043 } 3044 3045 return 0; 3046 3047err: 3048 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3049 for (++i; i < num_consumers; ++i) { 3050 r = regulator_enable(consumers[i].consumer); 3051 if (r != 0) 3052 pr_err("Failed to reename %s: %d\n", 3053 consumers[i].supply, r); 3054 } 3055 3056 return ret; 3057} 3058EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3059 3060/** 3061 * regulator_bulk_force_disable - force disable multiple regulator consumers 3062 * 3063 * @num_consumers: Number of consumers 3064 * @consumers: Consumer data; clients are stored here. 3065 * @return 0 on success, an errno on failure 3066 * 3067 * This convenience API allows consumers to forcibly disable multiple regulator 3068 * clients in a single API call. 3069 * NOTE: This should be used for situations when device damage will 3070 * likely occur if the regulators are not disabled (e.g. over temp). 3071 * Although regulator_force_disable function call for some consumers can 3072 * return error numbers, the function is called for all consumers. 3073 */ 3074int regulator_bulk_force_disable(int num_consumers, 3075 struct regulator_bulk_data *consumers) 3076{ 3077 int i; 3078 int ret; 3079 3080 for (i = 0; i < num_consumers; i++) 3081 consumers[i].ret = 3082 regulator_force_disable(consumers[i].consumer); 3083 3084 for (i = 0; i < num_consumers; i++) { 3085 if (consumers[i].ret != 0) { 3086 ret = consumers[i].ret; 3087 goto out; 3088 } 3089 } 3090 3091 return 0; 3092out: 3093 return ret; 3094} 3095EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3096 3097/** 3098 * regulator_bulk_free - free multiple regulator consumers 3099 * 3100 * @num_consumers: Number of consumers 3101 * @consumers: Consumer data; clients are stored here. 3102 * 3103 * This convenience API allows consumers to free multiple regulator 3104 * clients in a single API call. 3105 */ 3106void regulator_bulk_free(int num_consumers, 3107 struct regulator_bulk_data *consumers) 3108{ 3109 int i; 3110 3111 for (i = 0; i < num_consumers; i++) { 3112 regulator_put(consumers[i].consumer); 3113 consumers[i].consumer = NULL; 3114 } 3115} 3116EXPORT_SYMBOL_GPL(regulator_bulk_free); 3117 3118/** 3119 * regulator_notifier_call_chain - call regulator event notifier 3120 * @rdev: regulator source 3121 * @event: notifier block 3122 * @data: callback-specific data. 3123 * 3124 * Called by regulator drivers to notify clients a regulator event has 3125 * occurred. We also notify regulator clients downstream. 3126 * Note lock must be held by caller. 3127 */ 3128int regulator_notifier_call_chain(struct regulator_dev *rdev, 3129 unsigned long event, void *data) 3130{ 3131 _notifier_call_chain(rdev, event, data); 3132 return NOTIFY_DONE; 3133 3134} 3135EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3136 3137/** 3138 * regulator_mode_to_status - convert a regulator mode into a status 3139 * 3140 * @mode: Mode to convert 3141 * 3142 * Convert a regulator mode into a status. 3143 */ 3144int regulator_mode_to_status(unsigned int mode) 3145{ 3146 switch (mode) { 3147 case REGULATOR_MODE_FAST: 3148 return REGULATOR_STATUS_FAST; 3149 case REGULATOR_MODE_NORMAL: 3150 return REGULATOR_STATUS_NORMAL; 3151 case REGULATOR_MODE_IDLE: 3152 return REGULATOR_STATUS_IDLE; 3153 case REGULATOR_MODE_STANDBY: 3154 return REGULATOR_STATUS_STANDBY; 3155 default: 3156 return REGULATOR_STATUS_UNDEFINED; 3157 } 3158} 3159EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3160 3161/* 3162 * To avoid cluttering sysfs (and memory) with useless state, only 3163 * create attributes that can be meaningfully displayed. 3164 */ 3165static int add_regulator_attributes(struct regulator_dev *rdev) 3166{ 3167 struct device *dev = &rdev->dev; 3168 struct regulator_ops *ops = rdev->desc->ops; 3169 int status = 0; 3170 3171 /* some attributes need specific methods to be displayed */ 3172 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3173 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3174 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3175 status = device_create_file(dev, &dev_attr_microvolts); 3176 if (status < 0) 3177 return status; 3178 } 3179 if (ops->get_current_limit) { 3180 status = device_create_file(dev, &dev_attr_microamps); 3181 if (status < 0) 3182 return status; 3183 } 3184 if (ops->get_mode) { 3185 status = device_create_file(dev, &dev_attr_opmode); 3186 if (status < 0) 3187 return status; 3188 } 3189 if (ops->is_enabled) { 3190 status = device_create_file(dev, &dev_attr_state); 3191 if (status < 0) 3192 return status; 3193 } 3194 if (ops->get_status) { 3195 status = device_create_file(dev, &dev_attr_status); 3196 if (status < 0) 3197 return status; 3198 } 3199 if (ops->get_bypass) { 3200 status = device_create_file(dev, &dev_attr_bypass); 3201 if (status < 0) 3202 return status; 3203 } 3204 3205 /* some attributes are type-specific */ 3206 if (rdev->desc->type == REGULATOR_CURRENT) { 3207 status = device_create_file(dev, &dev_attr_requested_microamps); 3208 if (status < 0) 3209 return status; 3210 } 3211 3212 /* all the other attributes exist to support constraints; 3213 * don't show them if there are no constraints, or if the 3214 * relevant supporting methods are missing. 3215 */ 3216 if (!rdev->constraints) 3217 return status; 3218 3219 /* constraints need specific supporting methods */ 3220 if (ops->set_voltage || ops->set_voltage_sel) { 3221 status = device_create_file(dev, &dev_attr_min_microvolts); 3222 if (status < 0) 3223 return status; 3224 status = device_create_file(dev, &dev_attr_max_microvolts); 3225 if (status < 0) 3226 return status; 3227 } 3228 if (ops->set_current_limit) { 3229 status = device_create_file(dev, &dev_attr_min_microamps); 3230 if (status < 0) 3231 return status; 3232 status = device_create_file(dev, &dev_attr_max_microamps); 3233 if (status < 0) 3234 return status; 3235 } 3236 3237 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3238 if (status < 0) 3239 return status; 3240 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3241 if (status < 0) 3242 return status; 3243 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3244 if (status < 0) 3245 return status; 3246 3247 if (ops->set_suspend_voltage) { 3248 status = device_create_file(dev, 3249 &dev_attr_suspend_standby_microvolts); 3250 if (status < 0) 3251 return status; 3252 status = device_create_file(dev, 3253 &dev_attr_suspend_mem_microvolts); 3254 if (status < 0) 3255 return status; 3256 status = device_create_file(dev, 3257 &dev_attr_suspend_disk_microvolts); 3258 if (status < 0) 3259 return status; 3260 } 3261 3262 if (ops->set_suspend_mode) { 3263 status = device_create_file(dev, 3264 &dev_attr_suspend_standby_mode); 3265 if (status < 0) 3266 return status; 3267 status = device_create_file(dev, 3268 &dev_attr_suspend_mem_mode); 3269 if (status < 0) 3270 return status; 3271 status = device_create_file(dev, 3272 &dev_attr_suspend_disk_mode); 3273 if (status < 0) 3274 return status; 3275 } 3276 3277 return status; 3278} 3279 3280static void rdev_init_debugfs(struct regulator_dev *rdev) 3281{ 3282 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3283 if (!rdev->debugfs) { 3284 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3285 return; 3286 } 3287 3288 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3289 &rdev->use_count); 3290 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3291 &rdev->open_count); 3292 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3293 &rdev->bypass_count); 3294} 3295 3296/** 3297 * regulator_register - register regulator 3298 * @regulator_desc: regulator to register 3299 * @config: runtime configuration for regulator 3300 * 3301 * Called by regulator drivers to register a regulator. 3302 * Returns 0 on success. 3303 */ 3304struct regulator_dev * 3305regulator_register(const struct regulator_desc *regulator_desc, 3306 const struct regulator_config *config) 3307{ 3308 const struct regulation_constraints *constraints = NULL; 3309 const struct regulator_init_data *init_data; 3310 static atomic_t regulator_no = ATOMIC_INIT(0); 3311 struct regulator_dev *rdev; 3312 struct device *dev; 3313 int ret, i; 3314 const char *supply = NULL; 3315 3316 if (regulator_desc == NULL || config == NULL) 3317 return ERR_PTR(-EINVAL); 3318 3319 dev = config->dev; 3320 WARN_ON(!dev); 3321 3322 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3323 return ERR_PTR(-EINVAL); 3324 3325 if (regulator_desc->type != REGULATOR_VOLTAGE && 3326 regulator_desc->type != REGULATOR_CURRENT) 3327 return ERR_PTR(-EINVAL); 3328 3329 /* Only one of each should be implemented */ 3330 WARN_ON(regulator_desc->ops->get_voltage && 3331 regulator_desc->ops->get_voltage_sel); 3332 WARN_ON(regulator_desc->ops->set_voltage && 3333 regulator_desc->ops->set_voltage_sel); 3334 3335 /* If we're using selectors we must implement list_voltage. */ 3336 if (regulator_desc->ops->get_voltage_sel && 3337 !regulator_desc->ops->list_voltage) { 3338 return ERR_PTR(-EINVAL); 3339 } 3340 if (regulator_desc->ops->set_voltage_sel && 3341 !regulator_desc->ops->list_voltage) { 3342 return ERR_PTR(-EINVAL); 3343 } 3344 3345 init_data = config->init_data; 3346 3347 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3348 if (rdev == NULL) 3349 return ERR_PTR(-ENOMEM); 3350 3351 mutex_lock(®ulator_list_mutex); 3352 3353 mutex_init(&rdev->mutex); 3354 rdev->reg_data = config->driver_data; 3355 rdev->owner = regulator_desc->owner; 3356 rdev->desc = regulator_desc; 3357 if (config->regmap) 3358 rdev->regmap = config->regmap; 3359 else if (dev_get_regmap(dev, NULL)) 3360 rdev->regmap = dev_get_regmap(dev, NULL); 3361 else if (dev->parent) 3362 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3363 INIT_LIST_HEAD(&rdev->consumer_list); 3364 INIT_LIST_HEAD(&rdev->list); 3365 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3366 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3367 3368 /* preform any regulator specific init */ 3369 if (init_data && init_data->regulator_init) { 3370 ret = init_data->regulator_init(rdev->reg_data); 3371 if (ret < 0) 3372 goto clean; 3373 } 3374 3375 /* register with sysfs */ 3376 rdev->dev.class = ®ulator_class; 3377 rdev->dev.of_node = config->of_node; 3378 rdev->dev.parent = dev; 3379 dev_set_name(&rdev->dev, "regulator.%d", 3380 atomic_inc_return(®ulator_no) - 1); 3381 ret = device_register(&rdev->dev); 3382 if (ret != 0) { 3383 put_device(&rdev->dev); 3384 goto clean; 3385 } 3386 3387 dev_set_drvdata(&rdev->dev, rdev); 3388 3389 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3390 ret = gpio_request_one(config->ena_gpio, 3391 GPIOF_DIR_OUT | config->ena_gpio_flags, 3392 rdev_get_name(rdev)); 3393 if (ret != 0) { 3394 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3395 config->ena_gpio, ret); 3396 goto wash; 3397 } 3398 3399 rdev->ena_gpio = config->ena_gpio; 3400 rdev->ena_gpio_invert = config->ena_gpio_invert; 3401 3402 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3403 rdev->ena_gpio_state = 1; 3404 3405 if (rdev->ena_gpio_invert) 3406 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3407 } 3408 3409 /* set regulator constraints */ 3410 if (init_data) 3411 constraints = &init_data->constraints; 3412 3413 ret = set_machine_constraints(rdev, constraints); 3414 if (ret < 0) 3415 goto scrub; 3416 3417 /* add attributes supported by this regulator */ 3418 ret = add_regulator_attributes(rdev); 3419 if (ret < 0) 3420 goto scrub; 3421 3422 if (init_data && init_data->supply_regulator) 3423 supply = init_data->supply_regulator; 3424 else if (regulator_desc->supply_name) 3425 supply = regulator_desc->supply_name; 3426 3427 if (supply) { 3428 struct regulator_dev *r; 3429 3430 r = regulator_dev_lookup(dev, supply, &ret); 3431 3432 if (!r) { 3433 dev_err(dev, "Failed to find supply %s\n", supply); 3434 ret = -EPROBE_DEFER; 3435 goto scrub; 3436 } 3437 3438 ret = set_supply(rdev, r); 3439 if (ret < 0) 3440 goto scrub; 3441 3442 /* Enable supply if rail is enabled */ 3443 if (_regulator_is_enabled(rdev)) { 3444 ret = regulator_enable(rdev->supply); 3445 if (ret < 0) 3446 goto scrub; 3447 } 3448 } 3449 3450 /* add consumers devices */ 3451 if (init_data) { 3452 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3453 ret = set_consumer_device_supply(rdev, 3454 init_data->consumer_supplies[i].dev_name, 3455 init_data->consumer_supplies[i].supply); 3456 if (ret < 0) { 3457 dev_err(dev, "Failed to set supply %s\n", 3458 init_data->consumer_supplies[i].supply); 3459 goto unset_supplies; 3460 } 3461 } 3462 } 3463 3464 list_add(&rdev->list, ®ulator_list); 3465 3466 rdev_init_debugfs(rdev); 3467out: 3468 mutex_unlock(®ulator_list_mutex); 3469 return rdev; 3470 3471unset_supplies: 3472 unset_regulator_supplies(rdev); 3473 3474scrub: 3475 if (rdev->supply) 3476 _regulator_put(rdev->supply); 3477 if (rdev->ena_gpio) 3478 gpio_free(rdev->ena_gpio); 3479 kfree(rdev->constraints); 3480wash: 3481 device_unregister(&rdev->dev); 3482 /* device core frees rdev */ 3483 rdev = ERR_PTR(ret); 3484 goto out; 3485 3486clean: 3487 kfree(rdev); 3488 rdev = ERR_PTR(ret); 3489 goto out; 3490} 3491EXPORT_SYMBOL_GPL(regulator_register); 3492 3493/** 3494 * regulator_unregister - unregister regulator 3495 * @rdev: regulator to unregister 3496 * 3497 * Called by regulator drivers to unregister a regulator. 3498 */ 3499void regulator_unregister(struct regulator_dev *rdev) 3500{ 3501 if (rdev == NULL) 3502 return; 3503 3504 if (rdev->supply) 3505 regulator_put(rdev->supply); 3506 mutex_lock(®ulator_list_mutex); 3507 debugfs_remove_recursive(rdev->debugfs); 3508 flush_work(&rdev->disable_work.work); 3509 WARN_ON(rdev->open_count); 3510 unset_regulator_supplies(rdev); 3511 list_del(&rdev->list); 3512 kfree(rdev->constraints); 3513 if (rdev->ena_gpio) 3514 gpio_free(rdev->ena_gpio); 3515 device_unregister(&rdev->dev); 3516 mutex_unlock(®ulator_list_mutex); 3517} 3518EXPORT_SYMBOL_GPL(regulator_unregister); 3519 3520/** 3521 * regulator_suspend_prepare - prepare regulators for system wide suspend 3522 * @state: system suspend state 3523 * 3524 * Configure each regulator with it's suspend operating parameters for state. 3525 * This will usually be called by machine suspend code prior to supending. 3526 */ 3527int regulator_suspend_prepare(suspend_state_t state) 3528{ 3529 struct regulator_dev *rdev; 3530 int ret = 0; 3531 3532 /* ON is handled by regulator active state */ 3533 if (state == PM_SUSPEND_ON) 3534 return -EINVAL; 3535 3536 mutex_lock(®ulator_list_mutex); 3537 list_for_each_entry(rdev, ®ulator_list, list) { 3538 3539 mutex_lock(&rdev->mutex); 3540 ret = suspend_prepare(rdev, state); 3541 mutex_unlock(&rdev->mutex); 3542 3543 if (ret < 0) { 3544 rdev_err(rdev, "failed to prepare\n"); 3545 goto out; 3546 } 3547 } 3548out: 3549 mutex_unlock(®ulator_list_mutex); 3550 return ret; 3551} 3552EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3553 3554/** 3555 * regulator_suspend_finish - resume regulators from system wide suspend 3556 * 3557 * Turn on regulators that might be turned off by regulator_suspend_prepare 3558 * and that should be turned on according to the regulators properties. 3559 */ 3560int regulator_suspend_finish(void) 3561{ 3562 struct regulator_dev *rdev; 3563 int ret = 0, error; 3564 3565 mutex_lock(®ulator_list_mutex); 3566 list_for_each_entry(rdev, ®ulator_list, list) { 3567 struct regulator_ops *ops = rdev->desc->ops; 3568 3569 mutex_lock(&rdev->mutex); 3570 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3571 ops->enable) { 3572 error = ops->enable(rdev); 3573 if (error) 3574 ret = error; 3575 } else { 3576 if (!has_full_constraints) 3577 goto unlock; 3578 if (!ops->disable) 3579 goto unlock; 3580 if (!_regulator_is_enabled(rdev)) 3581 goto unlock; 3582 3583 error = ops->disable(rdev); 3584 if (error) 3585 ret = error; 3586 } 3587unlock: 3588 mutex_unlock(&rdev->mutex); 3589 } 3590 mutex_unlock(®ulator_list_mutex); 3591 return ret; 3592} 3593EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3594 3595/** 3596 * regulator_has_full_constraints - the system has fully specified constraints 3597 * 3598 * Calling this function will cause the regulator API to disable all 3599 * regulators which have a zero use count and don't have an always_on 3600 * constraint in a late_initcall. 3601 * 3602 * The intention is that this will become the default behaviour in a 3603 * future kernel release so users are encouraged to use this facility 3604 * now. 3605 */ 3606void regulator_has_full_constraints(void) 3607{ 3608 has_full_constraints = 1; 3609} 3610EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3611 3612/** 3613 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3614 * 3615 * Calling this function will cause the regulator API to provide a 3616 * dummy regulator to consumers if no physical regulator is found, 3617 * allowing most consumers to proceed as though a regulator were 3618 * configured. This allows systems such as those with software 3619 * controllable regulators for the CPU core only to be brought up more 3620 * readily. 3621 */ 3622void regulator_use_dummy_regulator(void) 3623{ 3624 board_wants_dummy_regulator = true; 3625} 3626EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3627 3628/** 3629 * rdev_get_drvdata - get rdev regulator driver data 3630 * @rdev: regulator 3631 * 3632 * Get rdev regulator driver private data. This call can be used in the 3633 * regulator driver context. 3634 */ 3635void *rdev_get_drvdata(struct regulator_dev *rdev) 3636{ 3637 return rdev->reg_data; 3638} 3639EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3640 3641/** 3642 * regulator_get_drvdata - get regulator driver data 3643 * @regulator: regulator 3644 * 3645 * Get regulator driver private data. This call can be used in the consumer 3646 * driver context when non API regulator specific functions need to be called. 3647 */ 3648void *regulator_get_drvdata(struct regulator *regulator) 3649{ 3650 return regulator->rdev->reg_data; 3651} 3652EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3653 3654/** 3655 * regulator_set_drvdata - set regulator driver data 3656 * @regulator: regulator 3657 * @data: data 3658 */ 3659void regulator_set_drvdata(struct regulator *regulator, void *data) 3660{ 3661 regulator->rdev->reg_data = data; 3662} 3663EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3664 3665/** 3666 * regulator_get_id - get regulator ID 3667 * @rdev: regulator 3668 */ 3669int rdev_get_id(struct regulator_dev *rdev) 3670{ 3671 return rdev->desc->id; 3672} 3673EXPORT_SYMBOL_GPL(rdev_get_id); 3674 3675struct device *rdev_get_dev(struct regulator_dev *rdev) 3676{ 3677 return &rdev->dev; 3678} 3679EXPORT_SYMBOL_GPL(rdev_get_dev); 3680 3681void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3682{ 3683 return reg_init_data->driver_data; 3684} 3685EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3686 3687#ifdef CONFIG_DEBUG_FS 3688static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3689 size_t count, loff_t *ppos) 3690{ 3691 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3692 ssize_t len, ret = 0; 3693 struct regulator_map *map; 3694 3695 if (!buf) 3696 return -ENOMEM; 3697 3698 list_for_each_entry(map, ®ulator_map_list, list) { 3699 len = snprintf(buf + ret, PAGE_SIZE - ret, 3700 "%s -> %s.%s\n", 3701 rdev_get_name(map->regulator), map->dev_name, 3702 map->supply); 3703 if (len >= 0) 3704 ret += len; 3705 if (ret > PAGE_SIZE) { 3706 ret = PAGE_SIZE; 3707 break; 3708 } 3709 } 3710 3711 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3712 3713 kfree(buf); 3714 3715 return ret; 3716} 3717#endif 3718 3719static const struct file_operations supply_map_fops = { 3720#ifdef CONFIG_DEBUG_FS 3721 .read = supply_map_read_file, 3722 .llseek = default_llseek, 3723#endif 3724}; 3725 3726static int __init regulator_init(void) 3727{ 3728 int ret; 3729 3730 ret = class_register(®ulator_class); 3731 3732 debugfs_root = debugfs_create_dir("regulator", NULL); 3733 if (!debugfs_root) 3734 pr_warn("regulator: Failed to create debugfs directory\n"); 3735 3736 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3737 &supply_map_fops); 3738 3739 regulator_dummy_init(); 3740 3741 return ret; 3742} 3743 3744/* init early to allow our consumers to complete system booting */ 3745core_initcall(regulator_init); 3746 3747static int __init regulator_init_complete(void) 3748{ 3749 struct regulator_dev *rdev; 3750 struct regulator_ops *ops; 3751 struct regulation_constraints *c; 3752 int enabled, ret; 3753 3754 /* 3755 * Since DT doesn't provide an idiomatic mechanism for 3756 * enabling full constraints and since it's much more natural 3757 * with DT to provide them just assume that a DT enabled 3758 * system has full constraints. 3759 */ 3760 if (of_have_populated_dt()) 3761 has_full_constraints = true; 3762 3763 mutex_lock(®ulator_list_mutex); 3764 3765 /* If we have a full configuration then disable any regulators 3766 * which are not in use or always_on. This will become the 3767 * default behaviour in the future. 3768 */ 3769 list_for_each_entry(rdev, ®ulator_list, list) { 3770 ops = rdev->desc->ops; 3771 c = rdev->constraints; 3772 3773 if (!ops->disable || (c && c->always_on)) 3774 continue; 3775 3776 mutex_lock(&rdev->mutex); 3777 3778 if (rdev->use_count) 3779 goto unlock; 3780 3781 /* If we can't read the status assume it's on. */ 3782 if (ops->is_enabled) 3783 enabled = ops->is_enabled(rdev); 3784 else 3785 enabled = 1; 3786 3787 if (!enabled) 3788 goto unlock; 3789 3790 if (has_full_constraints) { 3791 /* We log since this may kill the system if it 3792 * goes wrong. */ 3793 rdev_info(rdev, "disabling\n"); 3794 ret = ops->disable(rdev); 3795 if (ret != 0) { 3796 rdev_err(rdev, "couldn't disable: %d\n", ret); 3797 } 3798 } else { 3799 /* The intention is that in future we will 3800 * assume that full constraints are provided 3801 * so warn even if we aren't going to do 3802 * anything here. 3803 */ 3804 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3805 } 3806 3807unlock: 3808 mutex_unlock(&rdev->mutex); 3809 } 3810 3811 mutex_unlock(®ulator_list_mutex); 3812 3813 return 0; 3814} 3815late_initcall(regulator_init_complete); 3816