core.c revision 230a5a1c41464f7fe5b676c21280ae4effa222c8
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/of.h> 27#include <linux/regmap.h> 28#include <linux/regulator/of_regulator.h> 29#include <linux/regulator/consumer.h> 30#include <linux/regulator/driver.h> 31#include <linux/regulator/machine.h> 32#include <linux/module.h> 33 34#define CREATE_TRACE_POINTS 35#include <trace/events/regulator.h> 36 37#include "dummy.h" 38 39#define rdev_crit(rdev, fmt, ...) \ 40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_err(rdev, fmt, ...) \ 42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_warn(rdev, fmt, ...) \ 44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_info(rdev, fmt, ...) \ 46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_dbg(rdev, fmt, ...) \ 48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49 50static DEFINE_MUTEX(regulator_list_mutex); 51static LIST_HEAD(regulator_list); 52static LIST_HEAD(regulator_map_list); 53static bool has_full_constraints; 54static bool board_wants_dummy_regulator; 55 56static struct dentry *debugfs_root; 57 58/* 59 * struct regulator_map 60 * 61 * Used to provide symbolic supply names to devices. 62 */ 63struct regulator_map { 64 struct list_head list; 65 const char *dev_name; /* The dev_name() for the consumer */ 66 const char *supply; 67 struct regulator_dev *regulator; 68}; 69 70/* 71 * struct regulator 72 * 73 * One for each consumer device. 74 */ 75struct regulator { 76 struct device *dev; 77 struct list_head list; 78 unsigned int always_on:1; 79 int uA_load; 80 int min_uV; 81 int max_uV; 82 char *supply_name; 83 struct device_attribute dev_attr; 84 struct regulator_dev *rdev; 85 struct dentry *debugfs; 86}; 87 88static int _regulator_is_enabled(struct regulator_dev *rdev); 89static int _regulator_disable(struct regulator_dev *rdev); 90static int _regulator_get_voltage(struct regulator_dev *rdev); 91static int _regulator_get_current_limit(struct regulator_dev *rdev); 92static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 93static void _notifier_call_chain(struct regulator_dev *rdev, 94 unsigned long event, void *data); 95static int _regulator_do_set_voltage(struct regulator_dev *rdev, 96 int min_uV, int max_uV); 97static struct regulator *create_regulator(struct regulator_dev *rdev, 98 struct device *dev, 99 const char *supply_name); 100 101static const char *rdev_get_name(struct regulator_dev *rdev) 102{ 103 if (rdev->constraints && rdev->constraints->name) 104 return rdev->constraints->name; 105 else if (rdev->desc->name) 106 return rdev->desc->name; 107 else 108 return ""; 109} 110 111/* gets the regulator for a given consumer device */ 112static struct regulator *get_device_regulator(struct device *dev) 113{ 114 struct regulator *regulator = NULL; 115 struct regulator_dev *rdev; 116 117 mutex_lock(®ulator_list_mutex); 118 list_for_each_entry(rdev, ®ulator_list, list) { 119 mutex_lock(&rdev->mutex); 120 list_for_each_entry(regulator, &rdev->consumer_list, list) { 121 if (regulator->dev == dev) { 122 mutex_unlock(&rdev->mutex); 123 mutex_unlock(®ulator_list_mutex); 124 return regulator; 125 } 126 } 127 mutex_unlock(&rdev->mutex); 128 } 129 mutex_unlock(®ulator_list_mutex); 130 return NULL; 131} 132 133/** 134 * of_get_regulator - get a regulator device node based on supply name 135 * @dev: Device pointer for the consumer (of regulator) device 136 * @supply: regulator supply name 137 * 138 * Extract the regulator device node corresponding to the supply name. 139 * retruns the device node corresponding to the regulator if found, else 140 * returns NULL. 141 */ 142static struct device_node *of_get_regulator(struct device *dev, const char *supply) 143{ 144 struct device_node *regnode = NULL; 145 char prop_name[32]; /* 32 is max size of property name */ 146 147 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 148 149 snprintf(prop_name, 32, "%s-supply", supply); 150 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 151 152 if (!regnode) { 153 dev_dbg(dev, "Looking up %s property in node %s failed", 154 prop_name, dev->of_node->full_name); 155 return NULL; 156 } 157 return regnode; 158} 159 160static int _regulator_can_change_status(struct regulator_dev *rdev) 161{ 162 if (!rdev->constraints) 163 return 0; 164 165 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 166 return 1; 167 else 168 return 0; 169} 170 171/* Platform voltage constraint check */ 172static int regulator_check_voltage(struct regulator_dev *rdev, 173 int *min_uV, int *max_uV) 174{ 175 BUG_ON(*min_uV > *max_uV); 176 177 if (!rdev->constraints) { 178 rdev_err(rdev, "no constraints\n"); 179 return -ENODEV; 180 } 181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 182 rdev_err(rdev, "operation not allowed\n"); 183 return -EPERM; 184 } 185 186 if (*max_uV > rdev->constraints->max_uV) 187 *max_uV = rdev->constraints->max_uV; 188 if (*min_uV < rdev->constraints->min_uV) 189 *min_uV = rdev->constraints->min_uV; 190 191 if (*min_uV > *max_uV) { 192 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 193 *min_uV, *max_uV); 194 return -EINVAL; 195 } 196 197 return 0; 198} 199 200/* Make sure we select a voltage that suits the needs of all 201 * regulator consumers 202 */ 203static int regulator_check_consumers(struct regulator_dev *rdev, 204 int *min_uV, int *max_uV) 205{ 206 struct regulator *regulator; 207 208 list_for_each_entry(regulator, &rdev->consumer_list, list) { 209 /* 210 * Assume consumers that didn't say anything are OK 211 * with anything in the constraint range. 212 */ 213 if (!regulator->min_uV && !regulator->max_uV) 214 continue; 215 216 if (*max_uV > regulator->max_uV) 217 *max_uV = regulator->max_uV; 218 if (*min_uV < regulator->min_uV) 219 *min_uV = regulator->min_uV; 220 } 221 222 if (*min_uV > *max_uV) 223 return -EINVAL; 224 225 return 0; 226} 227 228/* current constraint check */ 229static int regulator_check_current_limit(struct regulator_dev *rdev, 230 int *min_uA, int *max_uA) 231{ 232 BUG_ON(*min_uA > *max_uA); 233 234 if (!rdev->constraints) { 235 rdev_err(rdev, "no constraints\n"); 236 return -ENODEV; 237 } 238 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 239 rdev_err(rdev, "operation not allowed\n"); 240 return -EPERM; 241 } 242 243 if (*max_uA > rdev->constraints->max_uA) 244 *max_uA = rdev->constraints->max_uA; 245 if (*min_uA < rdev->constraints->min_uA) 246 *min_uA = rdev->constraints->min_uA; 247 248 if (*min_uA > *max_uA) { 249 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 250 *min_uA, *max_uA); 251 return -EINVAL; 252 } 253 254 return 0; 255} 256 257/* operating mode constraint check */ 258static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 259{ 260 switch (*mode) { 261 case REGULATOR_MODE_FAST: 262 case REGULATOR_MODE_NORMAL: 263 case REGULATOR_MODE_IDLE: 264 case REGULATOR_MODE_STANDBY: 265 break; 266 default: 267 rdev_err(rdev, "invalid mode %x specified\n", *mode); 268 return -EINVAL; 269 } 270 271 if (!rdev->constraints) { 272 rdev_err(rdev, "no constraints\n"); 273 return -ENODEV; 274 } 275 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 276 rdev_err(rdev, "operation not allowed\n"); 277 return -EPERM; 278 } 279 280 /* The modes are bitmasks, the most power hungry modes having 281 * the lowest values. If the requested mode isn't supported 282 * try higher modes. */ 283 while (*mode) { 284 if (rdev->constraints->valid_modes_mask & *mode) 285 return 0; 286 *mode /= 2; 287 } 288 289 return -EINVAL; 290} 291 292/* dynamic regulator mode switching constraint check */ 293static int regulator_check_drms(struct regulator_dev *rdev) 294{ 295 if (!rdev->constraints) { 296 rdev_err(rdev, "no constraints\n"); 297 return -ENODEV; 298 } 299 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 300 rdev_err(rdev, "operation not allowed\n"); 301 return -EPERM; 302 } 303 return 0; 304} 305 306static ssize_t device_requested_uA_show(struct device *dev, 307 struct device_attribute *attr, char *buf) 308{ 309 struct regulator *regulator; 310 311 regulator = get_device_regulator(dev); 312 if (regulator == NULL) 313 return 0; 314 315 return sprintf(buf, "%d\n", regulator->uA_load); 316} 317 318static ssize_t regulator_uV_show(struct device *dev, 319 struct device_attribute *attr, char *buf) 320{ 321 struct regulator_dev *rdev = dev_get_drvdata(dev); 322 ssize_t ret; 323 324 mutex_lock(&rdev->mutex); 325 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 326 mutex_unlock(&rdev->mutex); 327 328 return ret; 329} 330static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 331 332static ssize_t regulator_uA_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 337 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 338} 339static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 340 341static ssize_t regulator_name_show(struct device *dev, 342 struct device_attribute *attr, char *buf) 343{ 344 struct regulator_dev *rdev = dev_get_drvdata(dev); 345 346 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 347} 348 349static ssize_t regulator_print_opmode(char *buf, int mode) 350{ 351 switch (mode) { 352 case REGULATOR_MODE_FAST: 353 return sprintf(buf, "fast\n"); 354 case REGULATOR_MODE_NORMAL: 355 return sprintf(buf, "normal\n"); 356 case REGULATOR_MODE_IDLE: 357 return sprintf(buf, "idle\n"); 358 case REGULATOR_MODE_STANDBY: 359 return sprintf(buf, "standby\n"); 360 } 361 return sprintf(buf, "unknown\n"); 362} 363 364static ssize_t regulator_opmode_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366{ 367 struct regulator_dev *rdev = dev_get_drvdata(dev); 368 369 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 370} 371static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 372 373static ssize_t regulator_print_state(char *buf, int state) 374{ 375 if (state > 0) 376 return sprintf(buf, "enabled\n"); 377 else if (state == 0) 378 return sprintf(buf, "disabled\n"); 379 else 380 return sprintf(buf, "unknown\n"); 381} 382 383static ssize_t regulator_state_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 ssize_t ret; 388 389 mutex_lock(&rdev->mutex); 390 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 391 mutex_unlock(&rdev->mutex); 392 393 return ret; 394} 395static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 396 397static ssize_t regulator_status_show(struct device *dev, 398 struct device_attribute *attr, char *buf) 399{ 400 struct regulator_dev *rdev = dev_get_drvdata(dev); 401 int status; 402 char *label; 403 404 status = rdev->desc->ops->get_status(rdev); 405 if (status < 0) 406 return status; 407 408 switch (status) { 409 case REGULATOR_STATUS_OFF: 410 label = "off"; 411 break; 412 case REGULATOR_STATUS_ON: 413 label = "on"; 414 break; 415 case REGULATOR_STATUS_ERROR: 416 label = "error"; 417 break; 418 case REGULATOR_STATUS_FAST: 419 label = "fast"; 420 break; 421 case REGULATOR_STATUS_NORMAL: 422 label = "normal"; 423 break; 424 case REGULATOR_STATUS_IDLE: 425 label = "idle"; 426 break; 427 case REGULATOR_STATUS_STANDBY: 428 label = "standby"; 429 break; 430 default: 431 return -ERANGE; 432 } 433 434 return sprintf(buf, "%s\n", label); 435} 436static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 437 438static ssize_t regulator_min_uA_show(struct device *dev, 439 struct device_attribute *attr, char *buf) 440{ 441 struct regulator_dev *rdev = dev_get_drvdata(dev); 442 443 if (!rdev->constraints) 444 return sprintf(buf, "constraint not defined\n"); 445 446 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 447} 448static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 449 450static ssize_t regulator_max_uA_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452{ 453 struct regulator_dev *rdev = dev_get_drvdata(dev); 454 455 if (!rdev->constraints) 456 return sprintf(buf, "constraint not defined\n"); 457 458 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 459} 460static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 461 462static ssize_t regulator_min_uV_show(struct device *dev, 463 struct device_attribute *attr, char *buf) 464{ 465 struct regulator_dev *rdev = dev_get_drvdata(dev); 466 467 if (!rdev->constraints) 468 return sprintf(buf, "constraint not defined\n"); 469 470 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 471} 472static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 473 474static ssize_t regulator_max_uV_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 479 if (!rdev->constraints) 480 return sprintf(buf, "constraint not defined\n"); 481 482 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 483} 484static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 485 486static ssize_t regulator_total_uA_show(struct device *dev, 487 struct device_attribute *attr, char *buf) 488{ 489 struct regulator_dev *rdev = dev_get_drvdata(dev); 490 struct regulator *regulator; 491 int uA = 0; 492 493 mutex_lock(&rdev->mutex); 494 list_for_each_entry(regulator, &rdev->consumer_list, list) 495 uA += regulator->uA_load; 496 mutex_unlock(&rdev->mutex); 497 return sprintf(buf, "%d\n", uA); 498} 499static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 500 501static ssize_t regulator_num_users_show(struct device *dev, 502 struct device_attribute *attr, char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 return sprintf(buf, "%d\n", rdev->use_count); 506} 507 508static ssize_t regulator_type_show(struct device *dev, 509 struct device_attribute *attr, char *buf) 510{ 511 struct regulator_dev *rdev = dev_get_drvdata(dev); 512 513 switch (rdev->desc->type) { 514 case REGULATOR_VOLTAGE: 515 return sprintf(buf, "voltage\n"); 516 case REGULATOR_CURRENT: 517 return sprintf(buf, "current\n"); 518 } 519 return sprintf(buf, "unknown\n"); 520} 521 522static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 523 struct device_attribute *attr, char *buf) 524{ 525 struct regulator_dev *rdev = dev_get_drvdata(dev); 526 527 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 528} 529static DEVICE_ATTR(suspend_mem_microvolts, 0444, 530 regulator_suspend_mem_uV_show, NULL); 531 532static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 533 struct device_attribute *attr, char *buf) 534{ 535 struct regulator_dev *rdev = dev_get_drvdata(dev); 536 537 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 538} 539static DEVICE_ATTR(suspend_disk_microvolts, 0444, 540 regulator_suspend_disk_uV_show, NULL); 541 542static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544{ 545 struct regulator_dev *rdev = dev_get_drvdata(dev); 546 547 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 548} 549static DEVICE_ATTR(suspend_standby_microvolts, 0444, 550 regulator_suspend_standby_uV_show, NULL); 551 552static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 553 struct device_attribute *attr, char *buf) 554{ 555 struct regulator_dev *rdev = dev_get_drvdata(dev); 556 557 return regulator_print_opmode(buf, 558 rdev->constraints->state_mem.mode); 559} 560static DEVICE_ATTR(suspend_mem_mode, 0444, 561 regulator_suspend_mem_mode_show, NULL); 562 563static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 564 struct device_attribute *attr, char *buf) 565{ 566 struct regulator_dev *rdev = dev_get_drvdata(dev); 567 568 return regulator_print_opmode(buf, 569 rdev->constraints->state_disk.mode); 570} 571static DEVICE_ATTR(suspend_disk_mode, 0444, 572 regulator_suspend_disk_mode_show, NULL); 573 574static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 575 struct device_attribute *attr, char *buf) 576{ 577 struct regulator_dev *rdev = dev_get_drvdata(dev); 578 579 return regulator_print_opmode(buf, 580 rdev->constraints->state_standby.mode); 581} 582static DEVICE_ATTR(suspend_standby_mode, 0444, 583 regulator_suspend_standby_mode_show, NULL); 584 585static ssize_t regulator_suspend_mem_state_show(struct device *dev, 586 struct device_attribute *attr, char *buf) 587{ 588 struct regulator_dev *rdev = dev_get_drvdata(dev); 589 590 return regulator_print_state(buf, 591 rdev->constraints->state_mem.enabled); 592} 593static DEVICE_ATTR(suspend_mem_state, 0444, 594 regulator_suspend_mem_state_show, NULL); 595 596static ssize_t regulator_suspend_disk_state_show(struct device *dev, 597 struct device_attribute *attr, char *buf) 598{ 599 struct regulator_dev *rdev = dev_get_drvdata(dev); 600 601 return regulator_print_state(buf, 602 rdev->constraints->state_disk.enabled); 603} 604static DEVICE_ATTR(suspend_disk_state, 0444, 605 regulator_suspend_disk_state_show, NULL); 606 607static ssize_t regulator_suspend_standby_state_show(struct device *dev, 608 struct device_attribute *attr, char *buf) 609{ 610 struct regulator_dev *rdev = dev_get_drvdata(dev); 611 612 return regulator_print_state(buf, 613 rdev->constraints->state_standby.enabled); 614} 615static DEVICE_ATTR(suspend_standby_state, 0444, 616 regulator_suspend_standby_state_show, NULL); 617 618 619/* 620 * These are the only attributes are present for all regulators. 621 * Other attributes are a function of regulator functionality. 622 */ 623static struct device_attribute regulator_dev_attrs[] = { 624 __ATTR(name, 0444, regulator_name_show, NULL), 625 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 626 __ATTR(type, 0444, regulator_type_show, NULL), 627 __ATTR_NULL, 628}; 629 630static void regulator_dev_release(struct device *dev) 631{ 632 struct regulator_dev *rdev = dev_get_drvdata(dev); 633 kfree(rdev); 634} 635 636static struct class regulator_class = { 637 .name = "regulator", 638 .dev_release = regulator_dev_release, 639 .dev_attrs = regulator_dev_attrs, 640}; 641 642/* Calculate the new optimum regulator operating mode based on the new total 643 * consumer load. All locks held by caller */ 644static void drms_uA_update(struct regulator_dev *rdev) 645{ 646 struct regulator *sibling; 647 int current_uA = 0, output_uV, input_uV, err; 648 unsigned int mode; 649 650 err = regulator_check_drms(rdev); 651 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 652 (!rdev->desc->ops->get_voltage && 653 !rdev->desc->ops->get_voltage_sel) || 654 !rdev->desc->ops->set_mode) 655 return; 656 657 /* get output voltage */ 658 output_uV = _regulator_get_voltage(rdev); 659 if (output_uV <= 0) 660 return; 661 662 /* get input voltage */ 663 input_uV = 0; 664 if (rdev->supply) 665 input_uV = regulator_get_voltage(rdev->supply); 666 if (input_uV <= 0) 667 input_uV = rdev->constraints->input_uV; 668 if (input_uV <= 0) 669 return; 670 671 /* calc total requested load */ 672 list_for_each_entry(sibling, &rdev->consumer_list, list) 673 current_uA += sibling->uA_load; 674 675 /* now get the optimum mode for our new total regulator load */ 676 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 677 output_uV, current_uA); 678 679 /* check the new mode is allowed */ 680 err = regulator_mode_constrain(rdev, &mode); 681 if (err == 0) 682 rdev->desc->ops->set_mode(rdev, mode); 683} 684 685static int suspend_set_state(struct regulator_dev *rdev, 686 struct regulator_state *rstate) 687{ 688 int ret = 0; 689 690 /* If we have no suspend mode configration don't set anything; 691 * only warn if the driver implements set_suspend_voltage or 692 * set_suspend_mode callback. 693 */ 694 if (!rstate->enabled && !rstate->disabled) { 695 if (rdev->desc->ops->set_suspend_voltage || 696 rdev->desc->ops->set_suspend_mode) 697 rdev_warn(rdev, "No configuration\n"); 698 return 0; 699 } 700 701 if (rstate->enabled && rstate->disabled) { 702 rdev_err(rdev, "invalid configuration\n"); 703 return -EINVAL; 704 } 705 706 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 707 ret = rdev->desc->ops->set_suspend_enable(rdev); 708 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 709 ret = rdev->desc->ops->set_suspend_disable(rdev); 710 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 711 ret = 0; 712 713 if (ret < 0) { 714 rdev_err(rdev, "failed to enabled/disable\n"); 715 return ret; 716 } 717 718 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 719 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 720 if (ret < 0) { 721 rdev_err(rdev, "failed to set voltage\n"); 722 return ret; 723 } 724 } 725 726 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 727 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 728 if (ret < 0) { 729 rdev_err(rdev, "failed to set mode\n"); 730 return ret; 731 } 732 } 733 return ret; 734} 735 736/* locks held by caller */ 737static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 738{ 739 if (!rdev->constraints) 740 return -EINVAL; 741 742 switch (state) { 743 case PM_SUSPEND_STANDBY: 744 return suspend_set_state(rdev, 745 &rdev->constraints->state_standby); 746 case PM_SUSPEND_MEM: 747 return suspend_set_state(rdev, 748 &rdev->constraints->state_mem); 749 case PM_SUSPEND_MAX: 750 return suspend_set_state(rdev, 751 &rdev->constraints->state_disk); 752 default: 753 return -EINVAL; 754 } 755} 756 757static void print_constraints(struct regulator_dev *rdev) 758{ 759 struct regulation_constraints *constraints = rdev->constraints; 760 char buf[80] = ""; 761 int count = 0; 762 int ret; 763 764 if (constraints->min_uV && constraints->max_uV) { 765 if (constraints->min_uV == constraints->max_uV) 766 count += sprintf(buf + count, "%d mV ", 767 constraints->min_uV / 1000); 768 else 769 count += sprintf(buf + count, "%d <--> %d mV ", 770 constraints->min_uV / 1000, 771 constraints->max_uV / 1000); 772 } 773 774 if (!constraints->min_uV || 775 constraints->min_uV != constraints->max_uV) { 776 ret = _regulator_get_voltage(rdev); 777 if (ret > 0) 778 count += sprintf(buf + count, "at %d mV ", ret / 1000); 779 } 780 781 if (constraints->uV_offset) 782 count += sprintf(buf, "%dmV offset ", 783 constraints->uV_offset / 1000); 784 785 if (constraints->min_uA && constraints->max_uA) { 786 if (constraints->min_uA == constraints->max_uA) 787 count += sprintf(buf + count, "%d mA ", 788 constraints->min_uA / 1000); 789 else 790 count += sprintf(buf + count, "%d <--> %d mA ", 791 constraints->min_uA / 1000, 792 constraints->max_uA / 1000); 793 } 794 795 if (!constraints->min_uA || 796 constraints->min_uA != constraints->max_uA) { 797 ret = _regulator_get_current_limit(rdev); 798 if (ret > 0) 799 count += sprintf(buf + count, "at %d mA ", ret / 1000); 800 } 801 802 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 803 count += sprintf(buf + count, "fast "); 804 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 805 count += sprintf(buf + count, "normal "); 806 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 807 count += sprintf(buf + count, "idle "); 808 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 809 count += sprintf(buf + count, "standby"); 810 811 rdev_info(rdev, "%s\n", buf); 812 813 if ((constraints->min_uV != constraints->max_uV) && 814 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 815 rdev_warn(rdev, 816 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 817} 818 819static int machine_constraints_voltage(struct regulator_dev *rdev, 820 struct regulation_constraints *constraints) 821{ 822 struct regulator_ops *ops = rdev->desc->ops; 823 int ret; 824 825 /* do we need to apply the constraint voltage */ 826 if (rdev->constraints->apply_uV && 827 rdev->constraints->min_uV == rdev->constraints->max_uV) { 828 ret = _regulator_do_set_voltage(rdev, 829 rdev->constraints->min_uV, 830 rdev->constraints->max_uV); 831 if (ret < 0) { 832 rdev_err(rdev, "failed to apply %duV constraint\n", 833 rdev->constraints->min_uV); 834 return ret; 835 } 836 } 837 838 /* constrain machine-level voltage specs to fit 839 * the actual range supported by this regulator. 840 */ 841 if (ops->list_voltage && rdev->desc->n_voltages) { 842 int count = rdev->desc->n_voltages; 843 int i; 844 int min_uV = INT_MAX; 845 int max_uV = INT_MIN; 846 int cmin = constraints->min_uV; 847 int cmax = constraints->max_uV; 848 849 /* it's safe to autoconfigure fixed-voltage supplies 850 and the constraints are used by list_voltage. */ 851 if (count == 1 && !cmin) { 852 cmin = 1; 853 cmax = INT_MAX; 854 constraints->min_uV = cmin; 855 constraints->max_uV = cmax; 856 } 857 858 /* voltage constraints are optional */ 859 if ((cmin == 0) && (cmax == 0)) 860 return 0; 861 862 /* else require explicit machine-level constraints */ 863 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 864 rdev_err(rdev, "invalid voltage constraints\n"); 865 return -EINVAL; 866 } 867 868 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 869 for (i = 0; i < count; i++) { 870 int value; 871 872 value = ops->list_voltage(rdev, i); 873 if (value <= 0) 874 continue; 875 876 /* maybe adjust [min_uV..max_uV] */ 877 if (value >= cmin && value < min_uV) 878 min_uV = value; 879 if (value <= cmax && value > max_uV) 880 max_uV = value; 881 } 882 883 /* final: [min_uV..max_uV] valid iff constraints valid */ 884 if (max_uV < min_uV) { 885 rdev_err(rdev, "unsupportable voltage constraints\n"); 886 return -EINVAL; 887 } 888 889 /* use regulator's subset of machine constraints */ 890 if (constraints->min_uV < min_uV) { 891 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 892 constraints->min_uV, min_uV); 893 constraints->min_uV = min_uV; 894 } 895 if (constraints->max_uV > max_uV) { 896 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 897 constraints->max_uV, max_uV); 898 constraints->max_uV = max_uV; 899 } 900 } 901 902 return 0; 903} 904 905/** 906 * set_machine_constraints - sets regulator constraints 907 * @rdev: regulator source 908 * @constraints: constraints to apply 909 * 910 * Allows platform initialisation code to define and constrain 911 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 912 * Constraints *must* be set by platform code in order for some 913 * regulator operations to proceed i.e. set_voltage, set_current_limit, 914 * set_mode. 915 */ 916static int set_machine_constraints(struct regulator_dev *rdev, 917 const struct regulation_constraints *constraints) 918{ 919 int ret = 0; 920 struct regulator_ops *ops = rdev->desc->ops; 921 922 if (constraints) 923 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 924 GFP_KERNEL); 925 else 926 rdev->constraints = kzalloc(sizeof(*constraints), 927 GFP_KERNEL); 928 if (!rdev->constraints) 929 return -ENOMEM; 930 931 ret = machine_constraints_voltage(rdev, rdev->constraints); 932 if (ret != 0) 933 goto out; 934 935 /* do we need to setup our suspend state */ 936 if (rdev->constraints->initial_state) { 937 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 938 if (ret < 0) { 939 rdev_err(rdev, "failed to set suspend state\n"); 940 goto out; 941 } 942 } 943 944 if (rdev->constraints->initial_mode) { 945 if (!ops->set_mode) { 946 rdev_err(rdev, "no set_mode operation\n"); 947 ret = -EINVAL; 948 goto out; 949 } 950 951 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 952 if (ret < 0) { 953 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 954 goto out; 955 } 956 } 957 958 /* If the constraints say the regulator should be on at this point 959 * and we have control then make sure it is enabled. 960 */ 961 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 962 ops->enable) { 963 ret = ops->enable(rdev); 964 if (ret < 0) { 965 rdev_err(rdev, "failed to enable\n"); 966 goto out; 967 } 968 } 969 970 print_constraints(rdev); 971 return 0; 972out: 973 kfree(rdev->constraints); 974 rdev->constraints = NULL; 975 return ret; 976} 977 978/** 979 * set_supply - set regulator supply regulator 980 * @rdev: regulator name 981 * @supply_rdev: supply regulator name 982 * 983 * Called by platform initialisation code to set the supply regulator for this 984 * regulator. This ensures that a regulators supply will also be enabled by the 985 * core if it's child is enabled. 986 */ 987static int set_supply(struct regulator_dev *rdev, 988 struct regulator_dev *supply_rdev) 989{ 990 int err; 991 992 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 993 994 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 995 if (rdev->supply == NULL) { 996 err = -ENOMEM; 997 return err; 998 } 999 1000 return 0; 1001} 1002 1003/** 1004 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1005 * @rdev: regulator source 1006 * @consumer_dev_name: dev_name() string for device supply applies to 1007 * @supply: symbolic name for supply 1008 * 1009 * Allows platform initialisation code to map physical regulator 1010 * sources to symbolic names for supplies for use by devices. Devices 1011 * should use these symbolic names to request regulators, avoiding the 1012 * need to provide board-specific regulator names as platform data. 1013 */ 1014static int set_consumer_device_supply(struct regulator_dev *rdev, 1015 const char *consumer_dev_name, 1016 const char *supply) 1017{ 1018 struct regulator_map *node; 1019 int has_dev; 1020 1021 if (supply == NULL) 1022 return -EINVAL; 1023 1024 if (consumer_dev_name != NULL) 1025 has_dev = 1; 1026 else 1027 has_dev = 0; 1028 1029 list_for_each_entry(node, ®ulator_map_list, list) { 1030 if (node->dev_name && consumer_dev_name) { 1031 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1032 continue; 1033 } else if (node->dev_name || consumer_dev_name) { 1034 continue; 1035 } 1036 1037 if (strcmp(node->supply, supply) != 0) 1038 continue; 1039 1040 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1041 consumer_dev_name, 1042 dev_name(&node->regulator->dev), 1043 node->regulator->desc->name, 1044 supply, 1045 dev_name(&rdev->dev), rdev_get_name(rdev)); 1046 return -EBUSY; 1047 } 1048 1049 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1050 if (node == NULL) 1051 return -ENOMEM; 1052 1053 node->regulator = rdev; 1054 node->supply = supply; 1055 1056 if (has_dev) { 1057 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1058 if (node->dev_name == NULL) { 1059 kfree(node); 1060 return -ENOMEM; 1061 } 1062 } 1063 1064 list_add(&node->list, ®ulator_map_list); 1065 return 0; 1066} 1067 1068static void unset_regulator_supplies(struct regulator_dev *rdev) 1069{ 1070 struct regulator_map *node, *n; 1071 1072 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1073 if (rdev == node->regulator) { 1074 list_del(&node->list); 1075 kfree(node->dev_name); 1076 kfree(node); 1077 } 1078 } 1079} 1080 1081#define REG_STR_SIZE 64 1082 1083static struct regulator *create_regulator(struct regulator_dev *rdev, 1084 struct device *dev, 1085 const char *supply_name) 1086{ 1087 struct regulator *regulator; 1088 char buf[REG_STR_SIZE]; 1089 int err, size; 1090 1091 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1092 if (regulator == NULL) 1093 return NULL; 1094 1095 mutex_lock(&rdev->mutex); 1096 regulator->rdev = rdev; 1097 list_add(®ulator->list, &rdev->consumer_list); 1098 1099 if (dev) { 1100 /* create a 'requested_microamps_name' sysfs entry */ 1101 size = scnprintf(buf, REG_STR_SIZE, 1102 "microamps_requested_%s-%s", 1103 dev_name(dev), supply_name); 1104 if (size >= REG_STR_SIZE) 1105 goto overflow_err; 1106 1107 regulator->dev = dev; 1108 sysfs_attr_init(®ulator->dev_attr.attr); 1109 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1110 if (regulator->dev_attr.attr.name == NULL) 1111 goto attr_name_err; 1112 1113 regulator->dev_attr.attr.mode = 0444; 1114 regulator->dev_attr.show = device_requested_uA_show; 1115 err = device_create_file(dev, ®ulator->dev_attr); 1116 if (err < 0) { 1117 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1118 goto attr_name_err; 1119 } 1120 1121 /* also add a link to the device sysfs entry */ 1122 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1123 dev->kobj.name, supply_name); 1124 if (size >= REG_STR_SIZE) 1125 goto attr_err; 1126 1127 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1128 if (regulator->supply_name == NULL) 1129 goto attr_err; 1130 1131 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1132 buf); 1133 if (err) { 1134 rdev_warn(rdev, "could not add device link %s err %d\n", 1135 dev->kobj.name, err); 1136 goto link_name_err; 1137 } 1138 } else { 1139 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1140 if (regulator->supply_name == NULL) 1141 goto attr_err; 1142 } 1143 1144 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1145 rdev->debugfs); 1146 if (!regulator->debugfs) { 1147 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1148 } else { 1149 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1150 ®ulator->uA_load); 1151 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1152 ®ulator->min_uV); 1153 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1154 ®ulator->max_uV); 1155 } 1156 1157 /* 1158 * Check now if the regulator is an always on regulator - if 1159 * it is then we don't need to do nearly so much work for 1160 * enable/disable calls. 1161 */ 1162 if (!_regulator_can_change_status(rdev) && 1163 _regulator_is_enabled(rdev)) 1164 regulator->always_on = true; 1165 1166 mutex_unlock(&rdev->mutex); 1167 return regulator; 1168link_name_err: 1169 kfree(regulator->supply_name); 1170attr_err: 1171 device_remove_file(regulator->dev, ®ulator->dev_attr); 1172attr_name_err: 1173 kfree(regulator->dev_attr.attr.name); 1174overflow_err: 1175 list_del(®ulator->list); 1176 kfree(regulator); 1177 mutex_unlock(&rdev->mutex); 1178 return NULL; 1179} 1180 1181static int _regulator_get_enable_time(struct regulator_dev *rdev) 1182{ 1183 if (!rdev->desc->ops->enable_time) 1184 return 0; 1185 return rdev->desc->ops->enable_time(rdev); 1186} 1187 1188static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1189 const char *supply, 1190 int *ret) 1191{ 1192 struct regulator_dev *r; 1193 struct device_node *node; 1194 struct regulator_map *map; 1195 const char *devname = NULL; 1196 1197 /* first do a dt based lookup */ 1198 if (dev && dev->of_node) { 1199 node = of_get_regulator(dev, supply); 1200 if (node) { 1201 list_for_each_entry(r, ®ulator_list, list) 1202 if (r->dev.parent && 1203 node == r->dev.of_node) 1204 return r; 1205 } else { 1206 /* 1207 * If we couldn't even get the node then it's 1208 * not just that the device didn't register 1209 * yet, there's no node and we'll never 1210 * succeed. 1211 */ 1212 *ret = -ENODEV; 1213 } 1214 } 1215 1216 /* if not found, try doing it non-dt way */ 1217 if (dev) 1218 devname = dev_name(dev); 1219 1220 list_for_each_entry(r, ®ulator_list, list) 1221 if (strcmp(rdev_get_name(r), supply) == 0) 1222 return r; 1223 1224 list_for_each_entry(map, ®ulator_map_list, list) { 1225 /* If the mapping has a device set up it must match */ 1226 if (map->dev_name && 1227 (!devname || strcmp(map->dev_name, devname))) 1228 continue; 1229 1230 if (strcmp(map->supply, supply) == 0) 1231 return map->regulator; 1232 } 1233 1234 1235 return NULL; 1236} 1237 1238/* Internal regulator request function */ 1239static struct regulator *_regulator_get(struct device *dev, const char *id, 1240 int exclusive) 1241{ 1242 struct regulator_dev *rdev; 1243 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1244 const char *devname = NULL; 1245 int ret; 1246 1247 if (id == NULL) { 1248 pr_err("get() with no identifier\n"); 1249 return regulator; 1250 } 1251 1252 if (dev) 1253 devname = dev_name(dev); 1254 1255 mutex_lock(®ulator_list_mutex); 1256 1257 rdev = regulator_dev_lookup(dev, id, &ret); 1258 if (rdev) 1259 goto found; 1260 1261 if (board_wants_dummy_regulator) { 1262 rdev = dummy_regulator_rdev; 1263 goto found; 1264 } 1265 1266#ifdef CONFIG_REGULATOR_DUMMY 1267 if (!devname) 1268 devname = "deviceless"; 1269 1270 /* If the board didn't flag that it was fully constrained then 1271 * substitute in a dummy regulator so consumers can continue. 1272 */ 1273 if (!has_full_constraints) { 1274 pr_warn("%s supply %s not found, using dummy regulator\n", 1275 devname, id); 1276 rdev = dummy_regulator_rdev; 1277 goto found; 1278 } 1279#endif 1280 1281 mutex_unlock(®ulator_list_mutex); 1282 return regulator; 1283 1284found: 1285 if (rdev->exclusive) { 1286 regulator = ERR_PTR(-EPERM); 1287 goto out; 1288 } 1289 1290 if (exclusive && rdev->open_count) { 1291 regulator = ERR_PTR(-EBUSY); 1292 goto out; 1293 } 1294 1295 if (!try_module_get(rdev->owner)) 1296 goto out; 1297 1298 regulator = create_regulator(rdev, dev, id); 1299 if (regulator == NULL) { 1300 regulator = ERR_PTR(-ENOMEM); 1301 module_put(rdev->owner); 1302 goto out; 1303 } 1304 1305 rdev->open_count++; 1306 if (exclusive) { 1307 rdev->exclusive = 1; 1308 1309 ret = _regulator_is_enabled(rdev); 1310 if (ret > 0) 1311 rdev->use_count = 1; 1312 else 1313 rdev->use_count = 0; 1314 } 1315 1316out: 1317 mutex_unlock(®ulator_list_mutex); 1318 1319 return regulator; 1320} 1321 1322/** 1323 * regulator_get - lookup and obtain a reference to a regulator. 1324 * @dev: device for regulator "consumer" 1325 * @id: Supply name or regulator ID. 1326 * 1327 * Returns a struct regulator corresponding to the regulator producer, 1328 * or IS_ERR() condition containing errno. 1329 * 1330 * Use of supply names configured via regulator_set_device_supply() is 1331 * strongly encouraged. It is recommended that the supply name used 1332 * should match the name used for the supply and/or the relevant 1333 * device pins in the datasheet. 1334 */ 1335struct regulator *regulator_get(struct device *dev, const char *id) 1336{ 1337 return _regulator_get(dev, id, 0); 1338} 1339EXPORT_SYMBOL_GPL(regulator_get); 1340 1341static void devm_regulator_release(struct device *dev, void *res) 1342{ 1343 regulator_put(*(struct regulator **)res); 1344} 1345 1346/** 1347 * devm_regulator_get - Resource managed regulator_get() 1348 * @dev: device for regulator "consumer" 1349 * @id: Supply name or regulator ID. 1350 * 1351 * Managed regulator_get(). Regulators returned from this function are 1352 * automatically regulator_put() on driver detach. See regulator_get() for more 1353 * information. 1354 */ 1355struct regulator *devm_regulator_get(struct device *dev, const char *id) 1356{ 1357 struct regulator **ptr, *regulator; 1358 1359 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1360 if (!ptr) 1361 return ERR_PTR(-ENOMEM); 1362 1363 regulator = regulator_get(dev, id); 1364 if (!IS_ERR(regulator)) { 1365 *ptr = regulator; 1366 devres_add(dev, ptr); 1367 } else { 1368 devres_free(ptr); 1369 } 1370 1371 return regulator; 1372} 1373EXPORT_SYMBOL_GPL(devm_regulator_get); 1374 1375/** 1376 * regulator_get_exclusive - obtain exclusive access to a regulator. 1377 * @dev: device for regulator "consumer" 1378 * @id: Supply name or regulator ID. 1379 * 1380 * Returns a struct regulator corresponding to the regulator producer, 1381 * or IS_ERR() condition containing errno. Other consumers will be 1382 * unable to obtain this reference is held and the use count for the 1383 * regulator will be initialised to reflect the current state of the 1384 * regulator. 1385 * 1386 * This is intended for use by consumers which cannot tolerate shared 1387 * use of the regulator such as those which need to force the 1388 * regulator off for correct operation of the hardware they are 1389 * controlling. 1390 * 1391 * Use of supply names configured via regulator_set_device_supply() is 1392 * strongly encouraged. It is recommended that the supply name used 1393 * should match the name used for the supply and/or the relevant 1394 * device pins in the datasheet. 1395 */ 1396struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1397{ 1398 return _regulator_get(dev, id, 1); 1399} 1400EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1401 1402/** 1403 * regulator_put - "free" the regulator source 1404 * @regulator: regulator source 1405 * 1406 * Note: drivers must ensure that all regulator_enable calls made on this 1407 * regulator source are balanced by regulator_disable calls prior to calling 1408 * this function. 1409 */ 1410void regulator_put(struct regulator *regulator) 1411{ 1412 struct regulator_dev *rdev; 1413 1414 if (regulator == NULL || IS_ERR(regulator)) 1415 return; 1416 1417 mutex_lock(®ulator_list_mutex); 1418 rdev = regulator->rdev; 1419 1420 debugfs_remove_recursive(regulator->debugfs); 1421 1422 /* remove any sysfs entries */ 1423 if (regulator->dev) { 1424 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1425 device_remove_file(regulator->dev, ®ulator->dev_attr); 1426 kfree(regulator->dev_attr.attr.name); 1427 } 1428 kfree(regulator->supply_name); 1429 list_del(®ulator->list); 1430 kfree(regulator); 1431 1432 rdev->open_count--; 1433 rdev->exclusive = 0; 1434 1435 module_put(rdev->owner); 1436 mutex_unlock(®ulator_list_mutex); 1437} 1438EXPORT_SYMBOL_GPL(regulator_put); 1439 1440static int devm_regulator_match(struct device *dev, void *res, void *data) 1441{ 1442 struct regulator **r = res; 1443 if (!r || !*r) { 1444 WARN_ON(!r || !*r); 1445 return 0; 1446 } 1447 return *r == data; 1448} 1449 1450/** 1451 * devm_regulator_put - Resource managed regulator_put() 1452 * @regulator: regulator to free 1453 * 1454 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1455 * this function will not need to be called and the resource management 1456 * code will ensure that the resource is freed. 1457 */ 1458void devm_regulator_put(struct regulator *regulator) 1459{ 1460 int rc; 1461 1462 rc = devres_release(regulator->dev, devm_regulator_release, 1463 devm_regulator_match, regulator); 1464 if (rc != 0) 1465 WARN_ON(rc); 1466} 1467EXPORT_SYMBOL_GPL(devm_regulator_put); 1468 1469/* locks held by regulator_enable() */ 1470static int _regulator_enable(struct regulator_dev *rdev) 1471{ 1472 int ret, delay; 1473 1474 /* check voltage and requested load before enabling */ 1475 if (rdev->constraints && 1476 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1477 drms_uA_update(rdev); 1478 1479 if (rdev->use_count == 0) { 1480 /* The regulator may on if it's not switchable or left on */ 1481 ret = _regulator_is_enabled(rdev); 1482 if (ret == -EINVAL || ret == 0) { 1483 if (!_regulator_can_change_status(rdev)) 1484 return -EPERM; 1485 1486 if (!rdev->desc->ops->enable) 1487 return -EINVAL; 1488 1489 /* Query before enabling in case configuration 1490 * dependent. */ 1491 ret = _regulator_get_enable_time(rdev); 1492 if (ret >= 0) { 1493 delay = ret; 1494 } else { 1495 rdev_warn(rdev, "enable_time() failed: %d\n", 1496 ret); 1497 delay = 0; 1498 } 1499 1500 trace_regulator_enable(rdev_get_name(rdev)); 1501 1502 /* Allow the regulator to ramp; it would be useful 1503 * to extend this for bulk operations so that the 1504 * regulators can ramp together. */ 1505 ret = rdev->desc->ops->enable(rdev); 1506 if (ret < 0) 1507 return ret; 1508 1509 trace_regulator_enable_delay(rdev_get_name(rdev)); 1510 1511 if (delay >= 1000) { 1512 mdelay(delay / 1000); 1513 udelay(delay % 1000); 1514 } else if (delay) { 1515 udelay(delay); 1516 } 1517 1518 trace_regulator_enable_complete(rdev_get_name(rdev)); 1519 1520 } else if (ret < 0) { 1521 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1522 return ret; 1523 } 1524 /* Fallthrough on positive return values - already enabled */ 1525 } 1526 1527 rdev->use_count++; 1528 1529 return 0; 1530} 1531 1532/** 1533 * regulator_enable - enable regulator output 1534 * @regulator: regulator source 1535 * 1536 * Request that the regulator be enabled with the regulator output at 1537 * the predefined voltage or current value. Calls to regulator_enable() 1538 * must be balanced with calls to regulator_disable(). 1539 * 1540 * NOTE: the output value can be set by other drivers, boot loader or may be 1541 * hardwired in the regulator. 1542 */ 1543int regulator_enable(struct regulator *regulator) 1544{ 1545 struct regulator_dev *rdev = regulator->rdev; 1546 int ret = 0; 1547 1548 if (regulator->always_on) 1549 return 0; 1550 1551 if (rdev->supply) { 1552 ret = regulator_enable(rdev->supply); 1553 if (ret != 0) 1554 return ret; 1555 } 1556 1557 mutex_lock(&rdev->mutex); 1558 ret = _regulator_enable(rdev); 1559 mutex_unlock(&rdev->mutex); 1560 1561 if (ret != 0 && rdev->supply) 1562 regulator_disable(rdev->supply); 1563 1564 return ret; 1565} 1566EXPORT_SYMBOL_GPL(regulator_enable); 1567 1568/* locks held by regulator_disable() */ 1569static int _regulator_disable(struct regulator_dev *rdev) 1570{ 1571 int ret = 0; 1572 1573 if (WARN(rdev->use_count <= 0, 1574 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1575 return -EIO; 1576 1577 /* are we the last user and permitted to disable ? */ 1578 if (rdev->use_count == 1 && 1579 (rdev->constraints && !rdev->constraints->always_on)) { 1580 1581 /* we are last user */ 1582 if (_regulator_can_change_status(rdev) && 1583 rdev->desc->ops->disable) { 1584 trace_regulator_disable(rdev_get_name(rdev)); 1585 1586 ret = rdev->desc->ops->disable(rdev); 1587 if (ret < 0) { 1588 rdev_err(rdev, "failed to disable\n"); 1589 return ret; 1590 } 1591 1592 trace_regulator_disable_complete(rdev_get_name(rdev)); 1593 1594 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1595 NULL); 1596 } 1597 1598 rdev->use_count = 0; 1599 } else if (rdev->use_count > 1) { 1600 1601 if (rdev->constraints && 1602 (rdev->constraints->valid_ops_mask & 1603 REGULATOR_CHANGE_DRMS)) 1604 drms_uA_update(rdev); 1605 1606 rdev->use_count--; 1607 } 1608 1609 return ret; 1610} 1611 1612/** 1613 * regulator_disable - disable regulator output 1614 * @regulator: regulator source 1615 * 1616 * Disable the regulator output voltage or current. Calls to 1617 * regulator_enable() must be balanced with calls to 1618 * regulator_disable(). 1619 * 1620 * NOTE: this will only disable the regulator output if no other consumer 1621 * devices have it enabled, the regulator device supports disabling and 1622 * machine constraints permit this operation. 1623 */ 1624int regulator_disable(struct regulator *regulator) 1625{ 1626 struct regulator_dev *rdev = regulator->rdev; 1627 int ret = 0; 1628 1629 if (regulator->always_on) 1630 return 0; 1631 1632 mutex_lock(&rdev->mutex); 1633 ret = _regulator_disable(rdev); 1634 mutex_unlock(&rdev->mutex); 1635 1636 if (ret == 0 && rdev->supply) 1637 regulator_disable(rdev->supply); 1638 1639 return ret; 1640} 1641EXPORT_SYMBOL_GPL(regulator_disable); 1642 1643/* locks held by regulator_force_disable() */ 1644static int _regulator_force_disable(struct regulator_dev *rdev) 1645{ 1646 int ret = 0; 1647 1648 /* force disable */ 1649 if (rdev->desc->ops->disable) { 1650 /* ah well, who wants to live forever... */ 1651 ret = rdev->desc->ops->disable(rdev); 1652 if (ret < 0) { 1653 rdev_err(rdev, "failed to force disable\n"); 1654 return ret; 1655 } 1656 /* notify other consumers that power has been forced off */ 1657 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1658 REGULATOR_EVENT_DISABLE, NULL); 1659 } 1660 1661 return ret; 1662} 1663 1664/** 1665 * regulator_force_disable - force disable regulator output 1666 * @regulator: regulator source 1667 * 1668 * Forcibly disable the regulator output voltage or current. 1669 * NOTE: this *will* disable the regulator output even if other consumer 1670 * devices have it enabled. This should be used for situations when device 1671 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1672 */ 1673int regulator_force_disable(struct regulator *regulator) 1674{ 1675 struct regulator_dev *rdev = regulator->rdev; 1676 int ret; 1677 1678 mutex_lock(&rdev->mutex); 1679 regulator->uA_load = 0; 1680 ret = _regulator_force_disable(regulator->rdev); 1681 mutex_unlock(&rdev->mutex); 1682 1683 if (rdev->supply) 1684 while (rdev->open_count--) 1685 regulator_disable(rdev->supply); 1686 1687 return ret; 1688} 1689EXPORT_SYMBOL_GPL(regulator_force_disable); 1690 1691static void regulator_disable_work(struct work_struct *work) 1692{ 1693 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1694 disable_work.work); 1695 int count, i, ret; 1696 1697 mutex_lock(&rdev->mutex); 1698 1699 BUG_ON(!rdev->deferred_disables); 1700 1701 count = rdev->deferred_disables; 1702 rdev->deferred_disables = 0; 1703 1704 for (i = 0; i < count; i++) { 1705 ret = _regulator_disable(rdev); 1706 if (ret != 0) 1707 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1708 } 1709 1710 mutex_unlock(&rdev->mutex); 1711 1712 if (rdev->supply) { 1713 for (i = 0; i < count; i++) { 1714 ret = regulator_disable(rdev->supply); 1715 if (ret != 0) { 1716 rdev_err(rdev, 1717 "Supply disable failed: %d\n", ret); 1718 } 1719 } 1720 } 1721} 1722 1723/** 1724 * regulator_disable_deferred - disable regulator output with delay 1725 * @regulator: regulator source 1726 * @ms: miliseconds until the regulator is disabled 1727 * 1728 * Execute regulator_disable() on the regulator after a delay. This 1729 * is intended for use with devices that require some time to quiesce. 1730 * 1731 * NOTE: this will only disable the regulator output if no other consumer 1732 * devices have it enabled, the regulator device supports disabling and 1733 * machine constraints permit this operation. 1734 */ 1735int regulator_disable_deferred(struct regulator *regulator, int ms) 1736{ 1737 struct regulator_dev *rdev = regulator->rdev; 1738 int ret; 1739 1740 if (regulator->always_on) 1741 return 0; 1742 1743 mutex_lock(&rdev->mutex); 1744 rdev->deferred_disables++; 1745 mutex_unlock(&rdev->mutex); 1746 1747 ret = schedule_delayed_work(&rdev->disable_work, 1748 msecs_to_jiffies(ms)); 1749 if (ret < 0) 1750 return ret; 1751 else 1752 return 0; 1753} 1754EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1755 1756/** 1757 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1758 * 1759 * @rdev: regulator to operate on 1760 * 1761 * Regulators that use regmap for their register I/O can set the 1762 * enable_reg and enable_mask fields in their descriptor and then use 1763 * this as their is_enabled operation, saving some code. 1764 */ 1765int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1766{ 1767 unsigned int val; 1768 int ret; 1769 1770 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1771 if (ret != 0) 1772 return ret; 1773 1774 return (val & rdev->desc->enable_mask) != 0; 1775} 1776EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1777 1778/** 1779 * regulator_enable_regmap - standard enable() for regmap users 1780 * 1781 * @rdev: regulator to operate on 1782 * 1783 * Regulators that use regmap for their register I/O can set the 1784 * enable_reg and enable_mask fields in their descriptor and then use 1785 * this as their enable() operation, saving some code. 1786 */ 1787int regulator_enable_regmap(struct regulator_dev *rdev) 1788{ 1789 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1790 rdev->desc->enable_mask, 1791 rdev->desc->enable_mask); 1792} 1793EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1794 1795/** 1796 * regulator_disable_regmap - standard disable() for regmap users 1797 * 1798 * @rdev: regulator to operate on 1799 * 1800 * Regulators that use regmap for their register I/O can set the 1801 * enable_reg and enable_mask fields in their descriptor and then use 1802 * this as their disable() operation, saving some code. 1803 */ 1804int regulator_disable_regmap(struct regulator_dev *rdev) 1805{ 1806 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1807 rdev->desc->enable_mask, 0); 1808} 1809EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1810 1811static int _regulator_is_enabled(struct regulator_dev *rdev) 1812{ 1813 /* If we don't know then assume that the regulator is always on */ 1814 if (!rdev->desc->ops->is_enabled) 1815 return 1; 1816 1817 return rdev->desc->ops->is_enabled(rdev); 1818} 1819 1820/** 1821 * regulator_is_enabled - is the regulator output enabled 1822 * @regulator: regulator source 1823 * 1824 * Returns positive if the regulator driver backing the source/client 1825 * has requested that the device be enabled, zero if it hasn't, else a 1826 * negative errno code. 1827 * 1828 * Note that the device backing this regulator handle can have multiple 1829 * users, so it might be enabled even if regulator_enable() was never 1830 * called for this particular source. 1831 */ 1832int regulator_is_enabled(struct regulator *regulator) 1833{ 1834 int ret; 1835 1836 if (regulator->always_on) 1837 return 1; 1838 1839 mutex_lock(®ulator->rdev->mutex); 1840 ret = _regulator_is_enabled(regulator->rdev); 1841 mutex_unlock(®ulator->rdev->mutex); 1842 1843 return ret; 1844} 1845EXPORT_SYMBOL_GPL(regulator_is_enabled); 1846 1847/** 1848 * regulator_count_voltages - count regulator_list_voltage() selectors 1849 * @regulator: regulator source 1850 * 1851 * Returns number of selectors, or negative errno. Selectors are 1852 * numbered starting at zero, and typically correspond to bitfields 1853 * in hardware registers. 1854 */ 1855int regulator_count_voltages(struct regulator *regulator) 1856{ 1857 struct regulator_dev *rdev = regulator->rdev; 1858 1859 return rdev->desc->n_voltages ? : -EINVAL; 1860} 1861EXPORT_SYMBOL_GPL(regulator_count_voltages); 1862 1863/** 1864 * regulator_list_voltage_linear - List voltages with simple calculation 1865 * 1866 * @rdev: Regulator device 1867 * @selector: Selector to convert into a voltage 1868 * 1869 * Regulators with a simple linear mapping between voltages and 1870 * selectors can set min_uV and uV_step in the regulator descriptor 1871 * and then use this function as their list_voltage() operation, 1872 */ 1873int regulator_list_voltage_linear(struct regulator_dev *rdev, 1874 unsigned int selector) 1875{ 1876 if (selector >= rdev->desc->n_voltages) 1877 return -EINVAL; 1878 1879 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1880} 1881EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1882 1883/** 1884 * regulator_list_voltage_table - List voltages with table based mapping 1885 * 1886 * @rdev: Regulator device 1887 * @selector: Selector to convert into a voltage 1888 * 1889 * Regulators with table based mapping between voltages and 1890 * selectors can set volt_table in the regulator descriptor 1891 * and then use this function as their list_voltage() operation. 1892 */ 1893int regulator_list_voltage_table(struct regulator_dev *rdev, 1894 unsigned int selector) 1895{ 1896 if (!rdev->desc->volt_table) { 1897 BUG_ON(!rdev->desc->volt_table); 1898 return -EINVAL; 1899 } 1900 1901 if (selector >= rdev->desc->n_voltages) 1902 return -EINVAL; 1903 1904 return rdev->desc->volt_table[selector]; 1905} 1906EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1907 1908/** 1909 * regulator_list_voltage - enumerate supported voltages 1910 * @regulator: regulator source 1911 * @selector: identify voltage to list 1912 * Context: can sleep 1913 * 1914 * Returns a voltage that can be passed to @regulator_set_voltage(), 1915 * zero if this selector code can't be used on this system, or a 1916 * negative errno. 1917 */ 1918int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1919{ 1920 struct regulator_dev *rdev = regulator->rdev; 1921 struct regulator_ops *ops = rdev->desc->ops; 1922 int ret; 1923 1924 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1925 return -EINVAL; 1926 1927 mutex_lock(&rdev->mutex); 1928 ret = ops->list_voltage(rdev, selector); 1929 mutex_unlock(&rdev->mutex); 1930 1931 if (ret > 0) { 1932 if (ret < rdev->constraints->min_uV) 1933 ret = 0; 1934 else if (ret > rdev->constraints->max_uV) 1935 ret = 0; 1936 } 1937 1938 return ret; 1939} 1940EXPORT_SYMBOL_GPL(regulator_list_voltage); 1941 1942/** 1943 * regulator_is_supported_voltage - check if a voltage range can be supported 1944 * 1945 * @regulator: Regulator to check. 1946 * @min_uV: Minimum required voltage in uV. 1947 * @max_uV: Maximum required voltage in uV. 1948 * 1949 * Returns a boolean or a negative error code. 1950 */ 1951int regulator_is_supported_voltage(struct regulator *regulator, 1952 int min_uV, int max_uV) 1953{ 1954 int i, voltages, ret; 1955 1956 ret = regulator_count_voltages(regulator); 1957 if (ret < 0) 1958 return ret; 1959 voltages = ret; 1960 1961 for (i = 0; i < voltages; i++) { 1962 ret = regulator_list_voltage(regulator, i); 1963 1964 if (ret >= min_uV && ret <= max_uV) 1965 return 1; 1966 } 1967 1968 return 0; 1969} 1970EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1971 1972/** 1973 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1974 * 1975 * @rdev: regulator to operate on 1976 * 1977 * Regulators that use regmap for their register I/O can set the 1978 * vsel_reg and vsel_mask fields in their descriptor and then use this 1979 * as their get_voltage_vsel operation, saving some code. 1980 */ 1981int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1982{ 1983 unsigned int val; 1984 int ret; 1985 1986 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1987 if (ret != 0) 1988 return ret; 1989 1990 val &= rdev->desc->vsel_mask; 1991 val >>= ffs(rdev->desc->vsel_mask) - 1; 1992 1993 return val; 1994} 1995EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1996 1997/** 1998 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1999 * 2000 * @rdev: regulator to operate on 2001 * @sel: Selector to set 2002 * 2003 * Regulators that use regmap for their register I/O can set the 2004 * vsel_reg and vsel_mask fields in their descriptor and then use this 2005 * as their set_voltage_vsel operation, saving some code. 2006 */ 2007int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2008{ 2009 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2010 2011 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2012 rdev->desc->vsel_mask, sel); 2013} 2014EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2015 2016/** 2017 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2018 * 2019 * @rdev: Regulator to operate on 2020 * @min_uV: Lower bound for voltage 2021 * @max_uV: Upper bound for voltage 2022 * 2023 * Drivers implementing set_voltage_sel() and list_voltage() can use 2024 * this as their map_voltage() operation. It will find a suitable 2025 * voltage by calling list_voltage() until it gets something in bounds 2026 * for the requested voltages. 2027 */ 2028int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2029 int min_uV, int max_uV) 2030{ 2031 int best_val = INT_MAX; 2032 int selector = 0; 2033 int i, ret; 2034 2035 /* Find the smallest voltage that falls within the specified 2036 * range. 2037 */ 2038 for (i = 0; i < rdev->desc->n_voltages; i++) { 2039 ret = rdev->desc->ops->list_voltage(rdev, i); 2040 if (ret < 0) 2041 continue; 2042 2043 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2044 best_val = ret; 2045 selector = i; 2046 } 2047 } 2048 2049 if (best_val != INT_MAX) 2050 return selector; 2051 else 2052 return -EINVAL; 2053} 2054EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2055 2056/** 2057 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2058 * 2059 * @rdev: Regulator to operate on 2060 * @min_uV: Lower bound for voltage 2061 * @max_uV: Upper bound for voltage 2062 * 2063 * Drivers providing min_uV and uV_step in their regulator_desc can 2064 * use this as their map_voltage() operation. 2065 */ 2066int regulator_map_voltage_linear(struct regulator_dev *rdev, 2067 int min_uV, int max_uV) 2068{ 2069 int ret, voltage; 2070 2071 if (!rdev->desc->uV_step) { 2072 BUG_ON(!rdev->desc->uV_step); 2073 return -EINVAL; 2074 } 2075 2076 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2077 if (ret < 0) 2078 return ret; 2079 2080 /* Map back into a voltage to verify we're still in bounds */ 2081 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2082 if (voltage < min_uV || voltage > max_uV) 2083 return -EINVAL; 2084 2085 return ret; 2086} 2087EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2088 2089static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2090 int min_uV, int max_uV) 2091{ 2092 int ret; 2093 int delay = 0; 2094 int best_val; 2095 unsigned int selector; 2096 int old_selector = -1; 2097 2098 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2099 2100 min_uV += rdev->constraints->uV_offset; 2101 max_uV += rdev->constraints->uV_offset; 2102 2103 /* 2104 * If we can't obtain the old selector there is not enough 2105 * info to call set_voltage_time_sel(). 2106 */ 2107 if (_regulator_is_enabled(rdev) && 2108 rdev->desc->ops->set_voltage_time_sel && 2109 rdev->desc->ops->get_voltage_sel) { 2110 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2111 if (old_selector < 0) 2112 return old_selector; 2113 } 2114 2115 if (rdev->desc->ops->set_voltage) { 2116 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2117 &selector); 2118 } else if (rdev->desc->ops->set_voltage_sel) { 2119 if (rdev->desc->ops->map_voltage) { 2120 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2121 max_uV); 2122 } else { 2123 if (rdev->desc->ops->list_voltage == 2124 regulator_list_voltage_linear) 2125 ret = regulator_map_voltage_linear(rdev, 2126 min_uV, max_uV); 2127 else 2128 ret = regulator_map_voltage_iterate(rdev, 2129 min_uV, max_uV); 2130 } 2131 2132 if (ret >= 0) { 2133 selector = ret; 2134 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2135 } 2136 } else { 2137 ret = -EINVAL; 2138 } 2139 2140 if (rdev->desc->ops->list_voltage) 2141 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2142 else 2143 best_val = _regulator_get_voltage(rdev); 2144 2145 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2146 if (_regulator_is_enabled(rdev) && ret == 0 && old_selector >= 0 && 2147 rdev->desc->ops->set_voltage_time_sel) { 2148 2149 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2150 old_selector, selector); 2151 if (delay < 0) { 2152 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2153 delay); 2154 delay = 0; 2155 } 2156 2157 /* Insert any necessary delays */ 2158 if (delay >= 1000) { 2159 mdelay(delay / 1000); 2160 udelay(delay % 1000); 2161 } else if (delay) { 2162 udelay(delay); 2163 } 2164 } 2165 2166 if (ret == 0 && best_val >= 0) 2167 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2168 (void *)best_val); 2169 2170 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2171 2172 return ret; 2173} 2174 2175/** 2176 * regulator_set_voltage - set regulator output voltage 2177 * @regulator: regulator source 2178 * @min_uV: Minimum required voltage in uV 2179 * @max_uV: Maximum acceptable voltage in uV 2180 * 2181 * Sets a voltage regulator to the desired output voltage. This can be set 2182 * during any regulator state. IOW, regulator can be disabled or enabled. 2183 * 2184 * If the regulator is enabled then the voltage will change to the new value 2185 * immediately otherwise if the regulator is disabled the regulator will 2186 * output at the new voltage when enabled. 2187 * 2188 * NOTE: If the regulator is shared between several devices then the lowest 2189 * request voltage that meets the system constraints will be used. 2190 * Regulator system constraints must be set for this regulator before 2191 * calling this function otherwise this call will fail. 2192 */ 2193int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2194{ 2195 struct regulator_dev *rdev = regulator->rdev; 2196 int ret = 0; 2197 2198 mutex_lock(&rdev->mutex); 2199 2200 /* If we're setting the same range as last time the change 2201 * should be a noop (some cpufreq implementations use the same 2202 * voltage for multiple frequencies, for example). 2203 */ 2204 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2205 goto out; 2206 2207 /* sanity check */ 2208 if (!rdev->desc->ops->set_voltage && 2209 !rdev->desc->ops->set_voltage_sel) { 2210 ret = -EINVAL; 2211 goto out; 2212 } 2213 2214 /* constraints check */ 2215 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2216 if (ret < 0) 2217 goto out; 2218 regulator->min_uV = min_uV; 2219 regulator->max_uV = max_uV; 2220 2221 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2222 if (ret < 0) 2223 goto out; 2224 2225 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2226 2227out: 2228 mutex_unlock(&rdev->mutex); 2229 return ret; 2230} 2231EXPORT_SYMBOL_GPL(regulator_set_voltage); 2232 2233/** 2234 * regulator_set_voltage_time - get raise/fall time 2235 * @regulator: regulator source 2236 * @old_uV: starting voltage in microvolts 2237 * @new_uV: target voltage in microvolts 2238 * 2239 * Provided with the starting and ending voltage, this function attempts to 2240 * calculate the time in microseconds required to rise or fall to this new 2241 * voltage. 2242 */ 2243int regulator_set_voltage_time(struct regulator *regulator, 2244 int old_uV, int new_uV) 2245{ 2246 struct regulator_dev *rdev = regulator->rdev; 2247 struct regulator_ops *ops = rdev->desc->ops; 2248 int old_sel = -1; 2249 int new_sel = -1; 2250 int voltage; 2251 int i; 2252 2253 /* Currently requires operations to do this */ 2254 if (!ops->list_voltage || !ops->set_voltage_time_sel 2255 || !rdev->desc->n_voltages) 2256 return -EINVAL; 2257 2258 for (i = 0; i < rdev->desc->n_voltages; i++) { 2259 /* We only look for exact voltage matches here */ 2260 voltage = regulator_list_voltage(regulator, i); 2261 if (voltage < 0) 2262 return -EINVAL; 2263 if (voltage == 0) 2264 continue; 2265 if (voltage == old_uV) 2266 old_sel = i; 2267 if (voltage == new_uV) 2268 new_sel = i; 2269 } 2270 2271 if (old_sel < 0 || new_sel < 0) 2272 return -EINVAL; 2273 2274 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2275} 2276EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2277 2278/** 2279 * regulator_sync_voltage - re-apply last regulator output voltage 2280 * @regulator: regulator source 2281 * 2282 * Re-apply the last configured voltage. This is intended to be used 2283 * where some external control source the consumer is cooperating with 2284 * has caused the configured voltage to change. 2285 */ 2286int regulator_sync_voltage(struct regulator *regulator) 2287{ 2288 struct regulator_dev *rdev = regulator->rdev; 2289 int ret, min_uV, max_uV; 2290 2291 mutex_lock(&rdev->mutex); 2292 2293 if (!rdev->desc->ops->set_voltage && 2294 !rdev->desc->ops->set_voltage_sel) { 2295 ret = -EINVAL; 2296 goto out; 2297 } 2298 2299 /* This is only going to work if we've had a voltage configured. */ 2300 if (!regulator->min_uV && !regulator->max_uV) { 2301 ret = -EINVAL; 2302 goto out; 2303 } 2304 2305 min_uV = regulator->min_uV; 2306 max_uV = regulator->max_uV; 2307 2308 /* This should be a paranoia check... */ 2309 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2310 if (ret < 0) 2311 goto out; 2312 2313 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2314 if (ret < 0) 2315 goto out; 2316 2317 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2318 2319out: 2320 mutex_unlock(&rdev->mutex); 2321 return ret; 2322} 2323EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2324 2325static int _regulator_get_voltage(struct regulator_dev *rdev) 2326{ 2327 int sel, ret; 2328 2329 if (rdev->desc->ops->get_voltage_sel) { 2330 sel = rdev->desc->ops->get_voltage_sel(rdev); 2331 if (sel < 0) 2332 return sel; 2333 ret = rdev->desc->ops->list_voltage(rdev, sel); 2334 } else if (rdev->desc->ops->get_voltage) { 2335 ret = rdev->desc->ops->get_voltage(rdev); 2336 } else { 2337 return -EINVAL; 2338 } 2339 2340 if (ret < 0) 2341 return ret; 2342 return ret - rdev->constraints->uV_offset; 2343} 2344 2345/** 2346 * regulator_get_voltage - get regulator output voltage 2347 * @regulator: regulator source 2348 * 2349 * This returns the current regulator voltage in uV. 2350 * 2351 * NOTE: If the regulator is disabled it will return the voltage value. This 2352 * function should not be used to determine regulator state. 2353 */ 2354int regulator_get_voltage(struct regulator *regulator) 2355{ 2356 int ret; 2357 2358 mutex_lock(®ulator->rdev->mutex); 2359 2360 ret = _regulator_get_voltage(regulator->rdev); 2361 2362 mutex_unlock(®ulator->rdev->mutex); 2363 2364 return ret; 2365} 2366EXPORT_SYMBOL_GPL(regulator_get_voltage); 2367 2368/** 2369 * regulator_set_current_limit - set regulator output current limit 2370 * @regulator: regulator source 2371 * @min_uA: Minimuum supported current in uA 2372 * @max_uA: Maximum supported current in uA 2373 * 2374 * Sets current sink to the desired output current. This can be set during 2375 * any regulator state. IOW, regulator can be disabled or enabled. 2376 * 2377 * If the regulator is enabled then the current will change to the new value 2378 * immediately otherwise if the regulator is disabled the regulator will 2379 * output at the new current when enabled. 2380 * 2381 * NOTE: Regulator system constraints must be set for this regulator before 2382 * calling this function otherwise this call will fail. 2383 */ 2384int regulator_set_current_limit(struct regulator *regulator, 2385 int min_uA, int max_uA) 2386{ 2387 struct regulator_dev *rdev = regulator->rdev; 2388 int ret; 2389 2390 mutex_lock(&rdev->mutex); 2391 2392 /* sanity check */ 2393 if (!rdev->desc->ops->set_current_limit) { 2394 ret = -EINVAL; 2395 goto out; 2396 } 2397 2398 /* constraints check */ 2399 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2400 if (ret < 0) 2401 goto out; 2402 2403 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2404out: 2405 mutex_unlock(&rdev->mutex); 2406 return ret; 2407} 2408EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2409 2410static int _regulator_get_current_limit(struct regulator_dev *rdev) 2411{ 2412 int ret; 2413 2414 mutex_lock(&rdev->mutex); 2415 2416 /* sanity check */ 2417 if (!rdev->desc->ops->get_current_limit) { 2418 ret = -EINVAL; 2419 goto out; 2420 } 2421 2422 ret = rdev->desc->ops->get_current_limit(rdev); 2423out: 2424 mutex_unlock(&rdev->mutex); 2425 return ret; 2426} 2427 2428/** 2429 * regulator_get_current_limit - get regulator output current 2430 * @regulator: regulator source 2431 * 2432 * This returns the current supplied by the specified current sink in uA. 2433 * 2434 * NOTE: If the regulator is disabled it will return the current value. This 2435 * function should not be used to determine regulator state. 2436 */ 2437int regulator_get_current_limit(struct regulator *regulator) 2438{ 2439 return _regulator_get_current_limit(regulator->rdev); 2440} 2441EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2442 2443/** 2444 * regulator_set_mode - set regulator operating mode 2445 * @regulator: regulator source 2446 * @mode: operating mode - one of the REGULATOR_MODE constants 2447 * 2448 * Set regulator operating mode to increase regulator efficiency or improve 2449 * regulation performance. 2450 * 2451 * NOTE: Regulator system constraints must be set for this regulator before 2452 * calling this function otherwise this call will fail. 2453 */ 2454int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2455{ 2456 struct regulator_dev *rdev = regulator->rdev; 2457 int ret; 2458 int regulator_curr_mode; 2459 2460 mutex_lock(&rdev->mutex); 2461 2462 /* sanity check */ 2463 if (!rdev->desc->ops->set_mode) { 2464 ret = -EINVAL; 2465 goto out; 2466 } 2467 2468 /* return if the same mode is requested */ 2469 if (rdev->desc->ops->get_mode) { 2470 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2471 if (regulator_curr_mode == mode) { 2472 ret = 0; 2473 goto out; 2474 } 2475 } 2476 2477 /* constraints check */ 2478 ret = regulator_mode_constrain(rdev, &mode); 2479 if (ret < 0) 2480 goto out; 2481 2482 ret = rdev->desc->ops->set_mode(rdev, mode); 2483out: 2484 mutex_unlock(&rdev->mutex); 2485 return ret; 2486} 2487EXPORT_SYMBOL_GPL(regulator_set_mode); 2488 2489static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2490{ 2491 int ret; 2492 2493 mutex_lock(&rdev->mutex); 2494 2495 /* sanity check */ 2496 if (!rdev->desc->ops->get_mode) { 2497 ret = -EINVAL; 2498 goto out; 2499 } 2500 2501 ret = rdev->desc->ops->get_mode(rdev); 2502out: 2503 mutex_unlock(&rdev->mutex); 2504 return ret; 2505} 2506 2507/** 2508 * regulator_get_mode - get regulator operating mode 2509 * @regulator: regulator source 2510 * 2511 * Get the current regulator operating mode. 2512 */ 2513unsigned int regulator_get_mode(struct regulator *regulator) 2514{ 2515 return _regulator_get_mode(regulator->rdev); 2516} 2517EXPORT_SYMBOL_GPL(regulator_get_mode); 2518 2519/** 2520 * regulator_set_optimum_mode - set regulator optimum operating mode 2521 * @regulator: regulator source 2522 * @uA_load: load current 2523 * 2524 * Notifies the regulator core of a new device load. This is then used by 2525 * DRMS (if enabled by constraints) to set the most efficient regulator 2526 * operating mode for the new regulator loading. 2527 * 2528 * Consumer devices notify their supply regulator of the maximum power 2529 * they will require (can be taken from device datasheet in the power 2530 * consumption tables) when they change operational status and hence power 2531 * state. Examples of operational state changes that can affect power 2532 * consumption are :- 2533 * 2534 * o Device is opened / closed. 2535 * o Device I/O is about to begin or has just finished. 2536 * o Device is idling in between work. 2537 * 2538 * This information is also exported via sysfs to userspace. 2539 * 2540 * DRMS will sum the total requested load on the regulator and change 2541 * to the most efficient operating mode if platform constraints allow. 2542 * 2543 * Returns the new regulator mode or error. 2544 */ 2545int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2546{ 2547 struct regulator_dev *rdev = regulator->rdev; 2548 struct regulator *consumer; 2549 int ret, output_uV, input_uV, total_uA_load = 0; 2550 unsigned int mode; 2551 2552 mutex_lock(&rdev->mutex); 2553 2554 /* 2555 * first check to see if we can set modes at all, otherwise just 2556 * tell the consumer everything is OK. 2557 */ 2558 regulator->uA_load = uA_load; 2559 ret = regulator_check_drms(rdev); 2560 if (ret < 0) { 2561 ret = 0; 2562 goto out; 2563 } 2564 2565 if (!rdev->desc->ops->get_optimum_mode) 2566 goto out; 2567 2568 /* 2569 * we can actually do this so any errors are indicators of 2570 * potential real failure. 2571 */ 2572 ret = -EINVAL; 2573 2574 if (!rdev->desc->ops->set_mode) 2575 goto out; 2576 2577 /* get output voltage */ 2578 output_uV = _regulator_get_voltage(rdev); 2579 if (output_uV <= 0) { 2580 rdev_err(rdev, "invalid output voltage found\n"); 2581 goto out; 2582 } 2583 2584 /* get input voltage */ 2585 input_uV = 0; 2586 if (rdev->supply) 2587 input_uV = regulator_get_voltage(rdev->supply); 2588 if (input_uV <= 0) 2589 input_uV = rdev->constraints->input_uV; 2590 if (input_uV <= 0) { 2591 rdev_err(rdev, "invalid input voltage found\n"); 2592 goto out; 2593 } 2594 2595 /* calc total requested load for this regulator */ 2596 list_for_each_entry(consumer, &rdev->consumer_list, list) 2597 total_uA_load += consumer->uA_load; 2598 2599 mode = rdev->desc->ops->get_optimum_mode(rdev, 2600 input_uV, output_uV, 2601 total_uA_load); 2602 ret = regulator_mode_constrain(rdev, &mode); 2603 if (ret < 0) { 2604 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2605 total_uA_load, input_uV, output_uV); 2606 goto out; 2607 } 2608 2609 ret = rdev->desc->ops->set_mode(rdev, mode); 2610 if (ret < 0) { 2611 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2612 goto out; 2613 } 2614 ret = mode; 2615out: 2616 mutex_unlock(&rdev->mutex); 2617 return ret; 2618} 2619EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2620 2621/** 2622 * regulator_register_notifier - register regulator event notifier 2623 * @regulator: regulator source 2624 * @nb: notifier block 2625 * 2626 * Register notifier block to receive regulator events. 2627 */ 2628int regulator_register_notifier(struct regulator *regulator, 2629 struct notifier_block *nb) 2630{ 2631 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2632 nb); 2633} 2634EXPORT_SYMBOL_GPL(regulator_register_notifier); 2635 2636/** 2637 * regulator_unregister_notifier - unregister regulator event notifier 2638 * @regulator: regulator source 2639 * @nb: notifier block 2640 * 2641 * Unregister regulator event notifier block. 2642 */ 2643int regulator_unregister_notifier(struct regulator *regulator, 2644 struct notifier_block *nb) 2645{ 2646 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2647 nb); 2648} 2649EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2650 2651/* notify regulator consumers and downstream regulator consumers. 2652 * Note mutex must be held by caller. 2653 */ 2654static void _notifier_call_chain(struct regulator_dev *rdev, 2655 unsigned long event, void *data) 2656{ 2657 /* call rdev chain first */ 2658 blocking_notifier_call_chain(&rdev->notifier, event, data); 2659} 2660 2661/** 2662 * regulator_bulk_get - get multiple regulator consumers 2663 * 2664 * @dev: Device to supply 2665 * @num_consumers: Number of consumers to register 2666 * @consumers: Configuration of consumers; clients are stored here. 2667 * 2668 * @return 0 on success, an errno on failure. 2669 * 2670 * This helper function allows drivers to get several regulator 2671 * consumers in one operation. If any of the regulators cannot be 2672 * acquired then any regulators that were allocated will be freed 2673 * before returning to the caller. 2674 */ 2675int regulator_bulk_get(struct device *dev, int num_consumers, 2676 struct regulator_bulk_data *consumers) 2677{ 2678 int i; 2679 int ret; 2680 2681 for (i = 0; i < num_consumers; i++) 2682 consumers[i].consumer = NULL; 2683 2684 for (i = 0; i < num_consumers; i++) { 2685 consumers[i].consumer = regulator_get(dev, 2686 consumers[i].supply); 2687 if (IS_ERR(consumers[i].consumer)) { 2688 ret = PTR_ERR(consumers[i].consumer); 2689 dev_err(dev, "Failed to get supply '%s': %d\n", 2690 consumers[i].supply, ret); 2691 consumers[i].consumer = NULL; 2692 goto err; 2693 } 2694 } 2695 2696 return 0; 2697 2698err: 2699 while (--i >= 0) 2700 regulator_put(consumers[i].consumer); 2701 2702 return ret; 2703} 2704EXPORT_SYMBOL_GPL(regulator_bulk_get); 2705 2706/** 2707 * devm_regulator_bulk_get - managed get multiple regulator consumers 2708 * 2709 * @dev: Device to supply 2710 * @num_consumers: Number of consumers to register 2711 * @consumers: Configuration of consumers; clients are stored here. 2712 * 2713 * @return 0 on success, an errno on failure. 2714 * 2715 * This helper function allows drivers to get several regulator 2716 * consumers in one operation with management, the regulators will 2717 * automatically be freed when the device is unbound. If any of the 2718 * regulators cannot be acquired then any regulators that were 2719 * allocated will be freed before returning to the caller. 2720 */ 2721int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2722 struct regulator_bulk_data *consumers) 2723{ 2724 int i; 2725 int ret; 2726 2727 for (i = 0; i < num_consumers; i++) 2728 consumers[i].consumer = NULL; 2729 2730 for (i = 0; i < num_consumers; i++) { 2731 consumers[i].consumer = devm_regulator_get(dev, 2732 consumers[i].supply); 2733 if (IS_ERR(consumers[i].consumer)) { 2734 ret = PTR_ERR(consumers[i].consumer); 2735 dev_err(dev, "Failed to get supply '%s': %d\n", 2736 consumers[i].supply, ret); 2737 consumers[i].consumer = NULL; 2738 goto err; 2739 } 2740 } 2741 2742 return 0; 2743 2744err: 2745 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2746 devm_regulator_put(consumers[i].consumer); 2747 2748 return ret; 2749} 2750EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2751 2752static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2753{ 2754 struct regulator_bulk_data *bulk = data; 2755 2756 bulk->ret = regulator_enable(bulk->consumer); 2757} 2758 2759/** 2760 * regulator_bulk_enable - enable multiple regulator consumers 2761 * 2762 * @num_consumers: Number of consumers 2763 * @consumers: Consumer data; clients are stored here. 2764 * @return 0 on success, an errno on failure 2765 * 2766 * This convenience API allows consumers to enable multiple regulator 2767 * clients in a single API call. If any consumers cannot be enabled 2768 * then any others that were enabled will be disabled again prior to 2769 * return. 2770 */ 2771int regulator_bulk_enable(int num_consumers, 2772 struct regulator_bulk_data *consumers) 2773{ 2774 LIST_HEAD(async_domain); 2775 int i; 2776 int ret = 0; 2777 2778 for (i = 0; i < num_consumers; i++) { 2779 if (consumers[i].consumer->always_on) 2780 consumers[i].ret = 0; 2781 else 2782 async_schedule_domain(regulator_bulk_enable_async, 2783 &consumers[i], &async_domain); 2784 } 2785 2786 async_synchronize_full_domain(&async_domain); 2787 2788 /* If any consumer failed we need to unwind any that succeeded */ 2789 for (i = 0; i < num_consumers; i++) { 2790 if (consumers[i].ret != 0) { 2791 ret = consumers[i].ret; 2792 goto err; 2793 } 2794 } 2795 2796 return 0; 2797 2798err: 2799 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2800 while (--i >= 0) 2801 regulator_disable(consumers[i].consumer); 2802 2803 return ret; 2804} 2805EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2806 2807/** 2808 * regulator_bulk_disable - disable multiple regulator consumers 2809 * 2810 * @num_consumers: Number of consumers 2811 * @consumers: Consumer data; clients are stored here. 2812 * @return 0 on success, an errno on failure 2813 * 2814 * This convenience API allows consumers to disable multiple regulator 2815 * clients in a single API call. If any consumers cannot be disabled 2816 * then any others that were disabled will be enabled again prior to 2817 * return. 2818 */ 2819int regulator_bulk_disable(int num_consumers, 2820 struct regulator_bulk_data *consumers) 2821{ 2822 int i; 2823 int ret, r; 2824 2825 for (i = num_consumers - 1; i >= 0; --i) { 2826 ret = regulator_disable(consumers[i].consumer); 2827 if (ret != 0) 2828 goto err; 2829 } 2830 2831 return 0; 2832 2833err: 2834 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2835 for (++i; i < num_consumers; ++i) { 2836 r = regulator_enable(consumers[i].consumer); 2837 if (r != 0) 2838 pr_err("Failed to reename %s: %d\n", 2839 consumers[i].supply, r); 2840 } 2841 2842 return ret; 2843} 2844EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2845 2846/** 2847 * regulator_bulk_force_disable - force disable multiple regulator consumers 2848 * 2849 * @num_consumers: Number of consumers 2850 * @consumers: Consumer data; clients are stored here. 2851 * @return 0 on success, an errno on failure 2852 * 2853 * This convenience API allows consumers to forcibly disable multiple regulator 2854 * clients in a single API call. 2855 * NOTE: This should be used for situations when device damage will 2856 * likely occur if the regulators are not disabled (e.g. over temp). 2857 * Although regulator_force_disable function call for some consumers can 2858 * return error numbers, the function is called for all consumers. 2859 */ 2860int regulator_bulk_force_disable(int num_consumers, 2861 struct regulator_bulk_data *consumers) 2862{ 2863 int i; 2864 int ret; 2865 2866 for (i = 0; i < num_consumers; i++) 2867 consumers[i].ret = 2868 regulator_force_disable(consumers[i].consumer); 2869 2870 for (i = 0; i < num_consumers; i++) { 2871 if (consumers[i].ret != 0) { 2872 ret = consumers[i].ret; 2873 goto out; 2874 } 2875 } 2876 2877 return 0; 2878out: 2879 return ret; 2880} 2881EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2882 2883/** 2884 * regulator_bulk_free - free multiple regulator consumers 2885 * 2886 * @num_consumers: Number of consumers 2887 * @consumers: Consumer data; clients are stored here. 2888 * 2889 * This convenience API allows consumers to free multiple regulator 2890 * clients in a single API call. 2891 */ 2892void regulator_bulk_free(int num_consumers, 2893 struct regulator_bulk_data *consumers) 2894{ 2895 int i; 2896 2897 for (i = 0; i < num_consumers; i++) { 2898 regulator_put(consumers[i].consumer); 2899 consumers[i].consumer = NULL; 2900 } 2901} 2902EXPORT_SYMBOL_GPL(regulator_bulk_free); 2903 2904/** 2905 * regulator_notifier_call_chain - call regulator event notifier 2906 * @rdev: regulator source 2907 * @event: notifier block 2908 * @data: callback-specific data. 2909 * 2910 * Called by regulator drivers to notify clients a regulator event has 2911 * occurred. We also notify regulator clients downstream. 2912 * Note lock must be held by caller. 2913 */ 2914int regulator_notifier_call_chain(struct regulator_dev *rdev, 2915 unsigned long event, void *data) 2916{ 2917 _notifier_call_chain(rdev, event, data); 2918 return NOTIFY_DONE; 2919 2920} 2921EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2922 2923/** 2924 * regulator_mode_to_status - convert a regulator mode into a status 2925 * 2926 * @mode: Mode to convert 2927 * 2928 * Convert a regulator mode into a status. 2929 */ 2930int regulator_mode_to_status(unsigned int mode) 2931{ 2932 switch (mode) { 2933 case REGULATOR_MODE_FAST: 2934 return REGULATOR_STATUS_FAST; 2935 case REGULATOR_MODE_NORMAL: 2936 return REGULATOR_STATUS_NORMAL; 2937 case REGULATOR_MODE_IDLE: 2938 return REGULATOR_STATUS_IDLE; 2939 case REGULATOR_STATUS_STANDBY: 2940 return REGULATOR_STATUS_STANDBY; 2941 default: 2942 return 0; 2943 } 2944} 2945EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2946 2947/* 2948 * To avoid cluttering sysfs (and memory) with useless state, only 2949 * create attributes that can be meaningfully displayed. 2950 */ 2951static int add_regulator_attributes(struct regulator_dev *rdev) 2952{ 2953 struct device *dev = &rdev->dev; 2954 struct regulator_ops *ops = rdev->desc->ops; 2955 int status = 0; 2956 2957 /* some attributes need specific methods to be displayed */ 2958 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2959 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2960 status = device_create_file(dev, &dev_attr_microvolts); 2961 if (status < 0) 2962 return status; 2963 } 2964 if (ops->get_current_limit) { 2965 status = device_create_file(dev, &dev_attr_microamps); 2966 if (status < 0) 2967 return status; 2968 } 2969 if (ops->get_mode) { 2970 status = device_create_file(dev, &dev_attr_opmode); 2971 if (status < 0) 2972 return status; 2973 } 2974 if (ops->is_enabled) { 2975 status = device_create_file(dev, &dev_attr_state); 2976 if (status < 0) 2977 return status; 2978 } 2979 if (ops->get_status) { 2980 status = device_create_file(dev, &dev_attr_status); 2981 if (status < 0) 2982 return status; 2983 } 2984 2985 /* some attributes are type-specific */ 2986 if (rdev->desc->type == REGULATOR_CURRENT) { 2987 status = device_create_file(dev, &dev_attr_requested_microamps); 2988 if (status < 0) 2989 return status; 2990 } 2991 2992 /* all the other attributes exist to support constraints; 2993 * don't show them if there are no constraints, or if the 2994 * relevant supporting methods are missing. 2995 */ 2996 if (!rdev->constraints) 2997 return status; 2998 2999 /* constraints need specific supporting methods */ 3000 if (ops->set_voltage || ops->set_voltage_sel) { 3001 status = device_create_file(dev, &dev_attr_min_microvolts); 3002 if (status < 0) 3003 return status; 3004 status = device_create_file(dev, &dev_attr_max_microvolts); 3005 if (status < 0) 3006 return status; 3007 } 3008 if (ops->set_current_limit) { 3009 status = device_create_file(dev, &dev_attr_min_microamps); 3010 if (status < 0) 3011 return status; 3012 status = device_create_file(dev, &dev_attr_max_microamps); 3013 if (status < 0) 3014 return status; 3015 } 3016 3017 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3018 if (status < 0) 3019 return status; 3020 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3021 if (status < 0) 3022 return status; 3023 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3024 if (status < 0) 3025 return status; 3026 3027 if (ops->set_suspend_voltage) { 3028 status = device_create_file(dev, 3029 &dev_attr_suspend_standby_microvolts); 3030 if (status < 0) 3031 return status; 3032 status = device_create_file(dev, 3033 &dev_attr_suspend_mem_microvolts); 3034 if (status < 0) 3035 return status; 3036 status = device_create_file(dev, 3037 &dev_attr_suspend_disk_microvolts); 3038 if (status < 0) 3039 return status; 3040 } 3041 3042 if (ops->set_suspend_mode) { 3043 status = device_create_file(dev, 3044 &dev_attr_suspend_standby_mode); 3045 if (status < 0) 3046 return status; 3047 status = device_create_file(dev, 3048 &dev_attr_suspend_mem_mode); 3049 if (status < 0) 3050 return status; 3051 status = device_create_file(dev, 3052 &dev_attr_suspend_disk_mode); 3053 if (status < 0) 3054 return status; 3055 } 3056 3057 return status; 3058} 3059 3060static void rdev_init_debugfs(struct regulator_dev *rdev) 3061{ 3062 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3063 if (!rdev->debugfs) { 3064 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3065 return; 3066 } 3067 3068 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3069 &rdev->use_count); 3070 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3071 &rdev->open_count); 3072} 3073 3074/** 3075 * regulator_register - register regulator 3076 * @regulator_desc: regulator to register 3077 * @config: runtime configuration for regulator 3078 * 3079 * Called by regulator drivers to register a regulator. 3080 * Returns 0 on success. 3081 */ 3082struct regulator_dev * 3083regulator_register(const struct regulator_desc *regulator_desc, 3084 const struct regulator_config *config) 3085{ 3086 const struct regulation_constraints *constraints = NULL; 3087 const struct regulator_init_data *init_data; 3088 static atomic_t regulator_no = ATOMIC_INIT(0); 3089 struct regulator_dev *rdev; 3090 struct device *dev; 3091 int ret, i; 3092 const char *supply = NULL; 3093 3094 if (regulator_desc == NULL || config == NULL) 3095 return ERR_PTR(-EINVAL); 3096 3097 dev = config->dev; 3098 WARN_ON(!dev); 3099 3100 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3101 return ERR_PTR(-EINVAL); 3102 3103 if (regulator_desc->type != REGULATOR_VOLTAGE && 3104 regulator_desc->type != REGULATOR_CURRENT) 3105 return ERR_PTR(-EINVAL); 3106 3107 /* Only one of each should be implemented */ 3108 WARN_ON(regulator_desc->ops->get_voltage && 3109 regulator_desc->ops->get_voltage_sel); 3110 WARN_ON(regulator_desc->ops->set_voltage && 3111 regulator_desc->ops->set_voltage_sel); 3112 3113 /* If we're using selectors we must implement list_voltage. */ 3114 if (regulator_desc->ops->get_voltage_sel && 3115 !regulator_desc->ops->list_voltage) { 3116 return ERR_PTR(-EINVAL); 3117 } 3118 if (regulator_desc->ops->set_voltage_sel && 3119 !regulator_desc->ops->list_voltage) { 3120 return ERR_PTR(-EINVAL); 3121 } 3122 3123 init_data = config->init_data; 3124 3125 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3126 if (rdev == NULL) 3127 return ERR_PTR(-ENOMEM); 3128 3129 mutex_lock(®ulator_list_mutex); 3130 3131 mutex_init(&rdev->mutex); 3132 rdev->reg_data = config->driver_data; 3133 rdev->owner = regulator_desc->owner; 3134 rdev->desc = regulator_desc; 3135 if (config->regmap) 3136 rdev->regmap = config->regmap; 3137 else 3138 rdev->regmap = dev_get_regmap(dev, NULL); 3139 INIT_LIST_HEAD(&rdev->consumer_list); 3140 INIT_LIST_HEAD(&rdev->list); 3141 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3142 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3143 3144 /* preform any regulator specific init */ 3145 if (init_data && init_data->regulator_init) { 3146 ret = init_data->regulator_init(rdev->reg_data); 3147 if (ret < 0) 3148 goto clean; 3149 } 3150 3151 /* register with sysfs */ 3152 rdev->dev.class = ®ulator_class; 3153 rdev->dev.of_node = config->of_node; 3154 rdev->dev.parent = dev; 3155 dev_set_name(&rdev->dev, "regulator.%d", 3156 atomic_inc_return(®ulator_no) - 1); 3157 ret = device_register(&rdev->dev); 3158 if (ret != 0) { 3159 put_device(&rdev->dev); 3160 goto clean; 3161 } 3162 3163 dev_set_drvdata(&rdev->dev, rdev); 3164 3165 /* set regulator constraints */ 3166 if (init_data) 3167 constraints = &init_data->constraints; 3168 3169 ret = set_machine_constraints(rdev, constraints); 3170 if (ret < 0) 3171 goto scrub; 3172 3173 /* add attributes supported by this regulator */ 3174 ret = add_regulator_attributes(rdev); 3175 if (ret < 0) 3176 goto scrub; 3177 3178 if (init_data && init_data->supply_regulator) 3179 supply = init_data->supply_regulator; 3180 else if (regulator_desc->supply_name) 3181 supply = regulator_desc->supply_name; 3182 3183 if (supply) { 3184 struct regulator_dev *r; 3185 3186 r = regulator_dev_lookup(dev, supply, &ret); 3187 3188 if (!r) { 3189 dev_err(dev, "Failed to find supply %s\n", supply); 3190 ret = -EPROBE_DEFER; 3191 goto scrub; 3192 } 3193 3194 ret = set_supply(rdev, r); 3195 if (ret < 0) 3196 goto scrub; 3197 3198 /* Enable supply if rail is enabled */ 3199 if (_regulator_is_enabled(rdev)) { 3200 ret = regulator_enable(rdev->supply); 3201 if (ret < 0) 3202 goto scrub; 3203 } 3204 } 3205 3206 /* add consumers devices */ 3207 if (init_data) { 3208 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3209 ret = set_consumer_device_supply(rdev, 3210 init_data->consumer_supplies[i].dev_name, 3211 init_data->consumer_supplies[i].supply); 3212 if (ret < 0) { 3213 dev_err(dev, "Failed to set supply %s\n", 3214 init_data->consumer_supplies[i].supply); 3215 goto unset_supplies; 3216 } 3217 } 3218 } 3219 3220 list_add(&rdev->list, ®ulator_list); 3221 3222 rdev_init_debugfs(rdev); 3223out: 3224 mutex_unlock(®ulator_list_mutex); 3225 return rdev; 3226 3227unset_supplies: 3228 unset_regulator_supplies(rdev); 3229 3230scrub: 3231 if (rdev->supply) 3232 regulator_put(rdev->supply); 3233 kfree(rdev->constraints); 3234 device_unregister(&rdev->dev); 3235 /* device core frees rdev */ 3236 rdev = ERR_PTR(ret); 3237 goto out; 3238 3239clean: 3240 kfree(rdev); 3241 rdev = ERR_PTR(ret); 3242 goto out; 3243} 3244EXPORT_SYMBOL_GPL(regulator_register); 3245 3246/** 3247 * regulator_unregister - unregister regulator 3248 * @rdev: regulator to unregister 3249 * 3250 * Called by regulator drivers to unregister a regulator. 3251 */ 3252void regulator_unregister(struct regulator_dev *rdev) 3253{ 3254 if (rdev == NULL) 3255 return; 3256 3257 if (rdev->supply) 3258 regulator_put(rdev->supply); 3259 mutex_lock(®ulator_list_mutex); 3260 debugfs_remove_recursive(rdev->debugfs); 3261 flush_work_sync(&rdev->disable_work.work); 3262 WARN_ON(rdev->open_count); 3263 unset_regulator_supplies(rdev); 3264 list_del(&rdev->list); 3265 kfree(rdev->constraints); 3266 device_unregister(&rdev->dev); 3267 mutex_unlock(®ulator_list_mutex); 3268} 3269EXPORT_SYMBOL_GPL(regulator_unregister); 3270 3271/** 3272 * regulator_suspend_prepare - prepare regulators for system wide suspend 3273 * @state: system suspend state 3274 * 3275 * Configure each regulator with it's suspend operating parameters for state. 3276 * This will usually be called by machine suspend code prior to supending. 3277 */ 3278int regulator_suspend_prepare(suspend_state_t state) 3279{ 3280 struct regulator_dev *rdev; 3281 int ret = 0; 3282 3283 /* ON is handled by regulator active state */ 3284 if (state == PM_SUSPEND_ON) 3285 return -EINVAL; 3286 3287 mutex_lock(®ulator_list_mutex); 3288 list_for_each_entry(rdev, ®ulator_list, list) { 3289 3290 mutex_lock(&rdev->mutex); 3291 ret = suspend_prepare(rdev, state); 3292 mutex_unlock(&rdev->mutex); 3293 3294 if (ret < 0) { 3295 rdev_err(rdev, "failed to prepare\n"); 3296 goto out; 3297 } 3298 } 3299out: 3300 mutex_unlock(®ulator_list_mutex); 3301 return ret; 3302} 3303EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3304 3305/** 3306 * regulator_suspend_finish - resume regulators from system wide suspend 3307 * 3308 * Turn on regulators that might be turned off by regulator_suspend_prepare 3309 * and that should be turned on according to the regulators properties. 3310 */ 3311int regulator_suspend_finish(void) 3312{ 3313 struct regulator_dev *rdev; 3314 int ret = 0, error; 3315 3316 mutex_lock(®ulator_list_mutex); 3317 list_for_each_entry(rdev, ®ulator_list, list) { 3318 struct regulator_ops *ops = rdev->desc->ops; 3319 3320 mutex_lock(&rdev->mutex); 3321 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3322 ops->enable) { 3323 error = ops->enable(rdev); 3324 if (error) 3325 ret = error; 3326 } else { 3327 if (!has_full_constraints) 3328 goto unlock; 3329 if (!ops->disable) 3330 goto unlock; 3331 if (!_regulator_is_enabled(rdev)) 3332 goto unlock; 3333 3334 error = ops->disable(rdev); 3335 if (error) 3336 ret = error; 3337 } 3338unlock: 3339 mutex_unlock(&rdev->mutex); 3340 } 3341 mutex_unlock(®ulator_list_mutex); 3342 return ret; 3343} 3344EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3345 3346/** 3347 * regulator_has_full_constraints - the system has fully specified constraints 3348 * 3349 * Calling this function will cause the regulator API to disable all 3350 * regulators which have a zero use count and don't have an always_on 3351 * constraint in a late_initcall. 3352 * 3353 * The intention is that this will become the default behaviour in a 3354 * future kernel release so users are encouraged to use this facility 3355 * now. 3356 */ 3357void regulator_has_full_constraints(void) 3358{ 3359 has_full_constraints = 1; 3360} 3361EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3362 3363/** 3364 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3365 * 3366 * Calling this function will cause the regulator API to provide a 3367 * dummy regulator to consumers if no physical regulator is found, 3368 * allowing most consumers to proceed as though a regulator were 3369 * configured. This allows systems such as those with software 3370 * controllable regulators for the CPU core only to be brought up more 3371 * readily. 3372 */ 3373void regulator_use_dummy_regulator(void) 3374{ 3375 board_wants_dummy_regulator = true; 3376} 3377EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3378 3379/** 3380 * rdev_get_drvdata - get rdev regulator driver data 3381 * @rdev: regulator 3382 * 3383 * Get rdev regulator driver private data. This call can be used in the 3384 * regulator driver context. 3385 */ 3386void *rdev_get_drvdata(struct regulator_dev *rdev) 3387{ 3388 return rdev->reg_data; 3389} 3390EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3391 3392/** 3393 * regulator_get_drvdata - get regulator driver data 3394 * @regulator: regulator 3395 * 3396 * Get regulator driver private data. This call can be used in the consumer 3397 * driver context when non API regulator specific functions need to be called. 3398 */ 3399void *regulator_get_drvdata(struct regulator *regulator) 3400{ 3401 return regulator->rdev->reg_data; 3402} 3403EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3404 3405/** 3406 * regulator_set_drvdata - set regulator driver data 3407 * @regulator: regulator 3408 * @data: data 3409 */ 3410void regulator_set_drvdata(struct regulator *regulator, void *data) 3411{ 3412 regulator->rdev->reg_data = data; 3413} 3414EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3415 3416/** 3417 * regulator_get_id - get regulator ID 3418 * @rdev: regulator 3419 */ 3420int rdev_get_id(struct regulator_dev *rdev) 3421{ 3422 return rdev->desc->id; 3423} 3424EXPORT_SYMBOL_GPL(rdev_get_id); 3425 3426struct device *rdev_get_dev(struct regulator_dev *rdev) 3427{ 3428 return &rdev->dev; 3429} 3430EXPORT_SYMBOL_GPL(rdev_get_dev); 3431 3432void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3433{ 3434 return reg_init_data->driver_data; 3435} 3436EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3437 3438#ifdef CONFIG_DEBUG_FS 3439static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3440 size_t count, loff_t *ppos) 3441{ 3442 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3443 ssize_t len, ret = 0; 3444 struct regulator_map *map; 3445 3446 if (!buf) 3447 return -ENOMEM; 3448 3449 list_for_each_entry(map, ®ulator_map_list, list) { 3450 len = snprintf(buf + ret, PAGE_SIZE - ret, 3451 "%s -> %s.%s\n", 3452 rdev_get_name(map->regulator), map->dev_name, 3453 map->supply); 3454 if (len >= 0) 3455 ret += len; 3456 if (ret > PAGE_SIZE) { 3457 ret = PAGE_SIZE; 3458 break; 3459 } 3460 } 3461 3462 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3463 3464 kfree(buf); 3465 3466 return ret; 3467} 3468#endif 3469 3470static const struct file_operations supply_map_fops = { 3471#ifdef CONFIG_DEBUG_FS 3472 .read = supply_map_read_file, 3473 .llseek = default_llseek, 3474#endif 3475}; 3476 3477static int __init regulator_init(void) 3478{ 3479 int ret; 3480 3481 ret = class_register(®ulator_class); 3482 3483 debugfs_root = debugfs_create_dir("regulator", NULL); 3484 if (!debugfs_root) 3485 pr_warn("regulator: Failed to create debugfs directory\n"); 3486 3487 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3488 &supply_map_fops); 3489 3490 regulator_dummy_init(); 3491 3492 return ret; 3493} 3494 3495/* init early to allow our consumers to complete system booting */ 3496core_initcall(regulator_init); 3497 3498static int __init regulator_init_complete(void) 3499{ 3500 struct regulator_dev *rdev; 3501 struct regulator_ops *ops; 3502 struct regulation_constraints *c; 3503 int enabled, ret; 3504 3505 mutex_lock(®ulator_list_mutex); 3506 3507 /* If we have a full configuration then disable any regulators 3508 * which are not in use or always_on. This will become the 3509 * default behaviour in the future. 3510 */ 3511 list_for_each_entry(rdev, ®ulator_list, list) { 3512 ops = rdev->desc->ops; 3513 c = rdev->constraints; 3514 3515 if (!ops->disable || (c && c->always_on)) 3516 continue; 3517 3518 mutex_lock(&rdev->mutex); 3519 3520 if (rdev->use_count) 3521 goto unlock; 3522 3523 /* If we can't read the status assume it's on. */ 3524 if (ops->is_enabled) 3525 enabled = ops->is_enabled(rdev); 3526 else 3527 enabled = 1; 3528 3529 if (!enabled) 3530 goto unlock; 3531 3532 if (has_full_constraints) { 3533 /* We log since this may kill the system if it 3534 * goes wrong. */ 3535 rdev_info(rdev, "disabling\n"); 3536 ret = ops->disable(rdev); 3537 if (ret != 0) { 3538 rdev_err(rdev, "couldn't disable: %d\n", ret); 3539 } 3540 } else { 3541 /* The intention is that in future we will 3542 * assume that full constraints are provided 3543 * so warn even if we aren't going to do 3544 * anything here. 3545 */ 3546 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3547 } 3548 3549unlock: 3550 mutex_unlock(&rdev->mutex); 3551 } 3552 3553 mutex_unlock(®ulator_list_mutex); 3554 3555 return 0; 3556} 3557late_initcall(regulator_init_complete); 3558