core.c revision e843fc4616485bbd8b5a115f5bd4f73808656373
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_destroy(regulator->dev, devm_regulator_release, 1463 devm_regulator_match, regulator); 1464 WARN_ON(rc); 1465} 1466EXPORT_SYMBOL_GPL(devm_regulator_put); 1467 1468/* locks held by regulator_enable() */ 1469static int _regulator_enable(struct regulator_dev *rdev) 1470{ 1471 int ret, delay; 1472 1473 /* check voltage and requested load before enabling */ 1474 if (rdev->constraints && 1475 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1476 drms_uA_update(rdev); 1477 1478 if (rdev->use_count == 0) { 1479 /* The regulator may on if it's not switchable or left on */ 1480 ret = _regulator_is_enabled(rdev); 1481 if (ret == -EINVAL || ret == 0) { 1482 if (!_regulator_can_change_status(rdev)) 1483 return -EPERM; 1484 1485 if (!rdev->desc->ops->enable) 1486 return -EINVAL; 1487 1488 /* Query before enabling in case configuration 1489 * dependent. */ 1490 ret = _regulator_get_enable_time(rdev); 1491 if (ret >= 0) { 1492 delay = ret; 1493 } else { 1494 rdev_warn(rdev, "enable_time() failed: %d\n", 1495 ret); 1496 delay = 0; 1497 } 1498 1499 trace_regulator_enable(rdev_get_name(rdev)); 1500 1501 /* Allow the regulator to ramp; it would be useful 1502 * to extend this for bulk operations so that the 1503 * regulators can ramp together. */ 1504 ret = rdev->desc->ops->enable(rdev); 1505 if (ret < 0) 1506 return ret; 1507 1508 trace_regulator_enable_delay(rdev_get_name(rdev)); 1509 1510 if (delay >= 1000) { 1511 mdelay(delay / 1000); 1512 udelay(delay % 1000); 1513 } else if (delay) { 1514 udelay(delay); 1515 } 1516 1517 trace_regulator_enable_complete(rdev_get_name(rdev)); 1518 1519 } else if (ret < 0) { 1520 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1521 return ret; 1522 } 1523 /* Fallthrough on positive return values - already enabled */ 1524 } 1525 1526 rdev->use_count++; 1527 1528 return 0; 1529} 1530 1531/** 1532 * regulator_enable - enable regulator output 1533 * @regulator: regulator source 1534 * 1535 * Request that the regulator be enabled with the regulator output at 1536 * the predefined voltage or current value. Calls to regulator_enable() 1537 * must be balanced with calls to regulator_disable(). 1538 * 1539 * NOTE: the output value can be set by other drivers, boot loader or may be 1540 * hardwired in the regulator. 1541 */ 1542int regulator_enable(struct regulator *regulator) 1543{ 1544 struct regulator_dev *rdev = regulator->rdev; 1545 int ret = 0; 1546 1547 if (regulator->always_on) 1548 return 0; 1549 1550 if (rdev->supply) { 1551 ret = regulator_enable(rdev->supply); 1552 if (ret != 0) 1553 return ret; 1554 } 1555 1556 mutex_lock(&rdev->mutex); 1557 ret = _regulator_enable(rdev); 1558 mutex_unlock(&rdev->mutex); 1559 1560 if (ret != 0 && rdev->supply) 1561 regulator_disable(rdev->supply); 1562 1563 return ret; 1564} 1565EXPORT_SYMBOL_GPL(regulator_enable); 1566 1567/* locks held by regulator_disable() */ 1568static int _regulator_disable(struct regulator_dev *rdev) 1569{ 1570 int ret = 0; 1571 1572 if (WARN(rdev->use_count <= 0, 1573 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1574 return -EIO; 1575 1576 /* are we the last user and permitted to disable ? */ 1577 if (rdev->use_count == 1 && 1578 (rdev->constraints && !rdev->constraints->always_on)) { 1579 1580 /* we are last user */ 1581 if (_regulator_can_change_status(rdev) && 1582 rdev->desc->ops->disable) { 1583 trace_regulator_disable(rdev_get_name(rdev)); 1584 1585 ret = rdev->desc->ops->disable(rdev); 1586 if (ret < 0) { 1587 rdev_err(rdev, "failed to disable\n"); 1588 return ret; 1589 } 1590 1591 trace_regulator_disable_complete(rdev_get_name(rdev)); 1592 1593 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1594 NULL); 1595 } 1596 1597 rdev->use_count = 0; 1598 } else if (rdev->use_count > 1) { 1599 1600 if (rdev->constraints && 1601 (rdev->constraints->valid_ops_mask & 1602 REGULATOR_CHANGE_DRMS)) 1603 drms_uA_update(rdev); 1604 1605 rdev->use_count--; 1606 } 1607 1608 return ret; 1609} 1610 1611/** 1612 * regulator_disable - disable regulator output 1613 * @regulator: regulator source 1614 * 1615 * Disable the regulator output voltage or current. Calls to 1616 * regulator_enable() must be balanced with calls to 1617 * regulator_disable(). 1618 * 1619 * NOTE: this will only disable the regulator output if no other consumer 1620 * devices have it enabled, the regulator device supports disabling and 1621 * machine constraints permit this operation. 1622 */ 1623int regulator_disable(struct regulator *regulator) 1624{ 1625 struct regulator_dev *rdev = regulator->rdev; 1626 int ret = 0; 1627 1628 if (regulator->always_on) 1629 return 0; 1630 1631 mutex_lock(&rdev->mutex); 1632 ret = _regulator_disable(rdev); 1633 mutex_unlock(&rdev->mutex); 1634 1635 if (ret == 0 && rdev->supply) 1636 regulator_disable(rdev->supply); 1637 1638 return ret; 1639} 1640EXPORT_SYMBOL_GPL(regulator_disable); 1641 1642/* locks held by regulator_force_disable() */ 1643static int _regulator_force_disable(struct regulator_dev *rdev) 1644{ 1645 int ret = 0; 1646 1647 /* force disable */ 1648 if (rdev->desc->ops->disable) { 1649 /* ah well, who wants to live forever... */ 1650 ret = rdev->desc->ops->disable(rdev); 1651 if (ret < 0) { 1652 rdev_err(rdev, "failed to force disable\n"); 1653 return ret; 1654 } 1655 /* notify other consumers that power has been forced off */ 1656 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1657 REGULATOR_EVENT_DISABLE, NULL); 1658 } 1659 1660 return ret; 1661} 1662 1663/** 1664 * regulator_force_disable - force disable regulator output 1665 * @regulator: regulator source 1666 * 1667 * Forcibly disable the regulator output voltage or current. 1668 * NOTE: this *will* disable the regulator output even if other consumer 1669 * devices have it enabled. This should be used for situations when device 1670 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1671 */ 1672int regulator_force_disable(struct regulator *regulator) 1673{ 1674 struct regulator_dev *rdev = regulator->rdev; 1675 int ret; 1676 1677 mutex_lock(&rdev->mutex); 1678 regulator->uA_load = 0; 1679 ret = _regulator_force_disable(regulator->rdev); 1680 mutex_unlock(&rdev->mutex); 1681 1682 if (rdev->supply) 1683 while (rdev->open_count--) 1684 regulator_disable(rdev->supply); 1685 1686 return ret; 1687} 1688EXPORT_SYMBOL_GPL(regulator_force_disable); 1689 1690static void regulator_disable_work(struct work_struct *work) 1691{ 1692 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1693 disable_work.work); 1694 int count, i, ret; 1695 1696 mutex_lock(&rdev->mutex); 1697 1698 BUG_ON(!rdev->deferred_disables); 1699 1700 count = rdev->deferred_disables; 1701 rdev->deferred_disables = 0; 1702 1703 for (i = 0; i < count; i++) { 1704 ret = _regulator_disable(rdev); 1705 if (ret != 0) 1706 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1707 } 1708 1709 mutex_unlock(&rdev->mutex); 1710 1711 if (rdev->supply) { 1712 for (i = 0; i < count; i++) { 1713 ret = regulator_disable(rdev->supply); 1714 if (ret != 0) { 1715 rdev_err(rdev, 1716 "Supply disable failed: %d\n", ret); 1717 } 1718 } 1719 } 1720} 1721 1722/** 1723 * regulator_disable_deferred - disable regulator output with delay 1724 * @regulator: regulator source 1725 * @ms: miliseconds until the regulator is disabled 1726 * 1727 * Execute regulator_disable() on the regulator after a delay. This 1728 * is intended for use with devices that require some time to quiesce. 1729 * 1730 * NOTE: this will only disable the regulator output if no other consumer 1731 * devices have it enabled, the regulator device supports disabling and 1732 * machine constraints permit this operation. 1733 */ 1734int regulator_disable_deferred(struct regulator *regulator, int ms) 1735{ 1736 struct regulator_dev *rdev = regulator->rdev; 1737 int ret; 1738 1739 if (regulator->always_on) 1740 return 0; 1741 1742 mutex_lock(&rdev->mutex); 1743 rdev->deferred_disables++; 1744 mutex_unlock(&rdev->mutex); 1745 1746 ret = schedule_delayed_work(&rdev->disable_work, 1747 msecs_to_jiffies(ms)); 1748 if (ret < 0) 1749 return ret; 1750 else 1751 return 0; 1752} 1753EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1754 1755/** 1756 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1757 * 1758 * @rdev: regulator to operate on 1759 * 1760 * Regulators that use regmap for their register I/O can set the 1761 * enable_reg and enable_mask fields in their descriptor and then use 1762 * this as their is_enabled operation, saving some code. 1763 */ 1764int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1765{ 1766 unsigned int val; 1767 int ret; 1768 1769 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1770 if (ret != 0) 1771 return ret; 1772 1773 return (val & rdev->desc->enable_mask) != 0; 1774} 1775EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1776 1777/** 1778 * regulator_enable_regmap - standard enable() for regmap users 1779 * 1780 * @rdev: regulator to operate on 1781 * 1782 * Regulators that use regmap for their register I/O can set the 1783 * enable_reg and enable_mask fields in their descriptor and then use 1784 * this as their enable() operation, saving some code. 1785 */ 1786int regulator_enable_regmap(struct regulator_dev *rdev) 1787{ 1788 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1789 rdev->desc->enable_mask, 1790 rdev->desc->enable_mask); 1791} 1792EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1793 1794/** 1795 * regulator_disable_regmap - standard disable() for regmap users 1796 * 1797 * @rdev: regulator to operate on 1798 * 1799 * Regulators that use regmap for their register I/O can set the 1800 * enable_reg and enable_mask fields in their descriptor and then use 1801 * this as their disable() operation, saving some code. 1802 */ 1803int regulator_disable_regmap(struct regulator_dev *rdev) 1804{ 1805 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1806 rdev->desc->enable_mask, 0); 1807} 1808EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1809 1810static int _regulator_is_enabled(struct regulator_dev *rdev) 1811{ 1812 /* If we don't know then assume that the regulator is always on */ 1813 if (!rdev->desc->ops->is_enabled) 1814 return 1; 1815 1816 return rdev->desc->ops->is_enabled(rdev); 1817} 1818 1819/** 1820 * regulator_is_enabled - is the regulator output enabled 1821 * @regulator: regulator source 1822 * 1823 * Returns positive if the regulator driver backing the source/client 1824 * has requested that the device be enabled, zero if it hasn't, else a 1825 * negative errno code. 1826 * 1827 * Note that the device backing this regulator handle can have multiple 1828 * users, so it might be enabled even if regulator_enable() was never 1829 * called for this particular source. 1830 */ 1831int regulator_is_enabled(struct regulator *regulator) 1832{ 1833 int ret; 1834 1835 if (regulator->always_on) 1836 return 1; 1837 1838 mutex_lock(®ulator->rdev->mutex); 1839 ret = _regulator_is_enabled(regulator->rdev); 1840 mutex_unlock(®ulator->rdev->mutex); 1841 1842 return ret; 1843} 1844EXPORT_SYMBOL_GPL(regulator_is_enabled); 1845 1846/** 1847 * regulator_count_voltages - count regulator_list_voltage() selectors 1848 * @regulator: regulator source 1849 * 1850 * Returns number of selectors, or negative errno. Selectors are 1851 * numbered starting at zero, and typically correspond to bitfields 1852 * in hardware registers. 1853 */ 1854int regulator_count_voltages(struct regulator *regulator) 1855{ 1856 struct regulator_dev *rdev = regulator->rdev; 1857 1858 return rdev->desc->n_voltages ? : -EINVAL; 1859} 1860EXPORT_SYMBOL_GPL(regulator_count_voltages); 1861 1862/** 1863 * regulator_list_voltage - enumerate supported voltages 1864 * @regulator: regulator source 1865 * @selector: identify voltage to list 1866 * Context: can sleep 1867 * 1868 * Returns a voltage that can be passed to @regulator_set_voltage(), 1869 * zero if this selector code can't be used on this system, or a 1870 * negative errno. 1871 */ 1872int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1873{ 1874 struct regulator_dev *rdev = regulator->rdev; 1875 struct regulator_ops *ops = rdev->desc->ops; 1876 int ret; 1877 1878 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1879 return -EINVAL; 1880 1881 mutex_lock(&rdev->mutex); 1882 ret = ops->list_voltage(rdev, selector); 1883 mutex_unlock(&rdev->mutex); 1884 1885 if (ret > 0) { 1886 if (ret < rdev->constraints->min_uV) 1887 ret = 0; 1888 else if (ret > rdev->constraints->max_uV) 1889 ret = 0; 1890 } 1891 1892 return ret; 1893} 1894EXPORT_SYMBOL_GPL(regulator_list_voltage); 1895 1896/** 1897 * regulator_is_supported_voltage - check if a voltage range can be supported 1898 * 1899 * @regulator: Regulator to check. 1900 * @min_uV: Minimum required voltage in uV. 1901 * @max_uV: Maximum required voltage in uV. 1902 * 1903 * Returns a boolean or a negative error code. 1904 */ 1905int regulator_is_supported_voltage(struct regulator *regulator, 1906 int min_uV, int max_uV) 1907{ 1908 int i, voltages, ret; 1909 1910 ret = regulator_count_voltages(regulator); 1911 if (ret < 0) 1912 return ret; 1913 voltages = ret; 1914 1915 for (i = 0; i < voltages; i++) { 1916 ret = regulator_list_voltage(regulator, i); 1917 1918 if (ret >= min_uV && ret <= max_uV) 1919 return 1; 1920 } 1921 1922 return 0; 1923} 1924EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1925 1926/** 1927 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1928 * 1929 * @rdev: regulator to operate on 1930 * 1931 * Regulators that use regmap for their register I/O can set the 1932 * vsel_reg and vsel_mask fields in their descriptor and then use this 1933 * as their get_voltage_vsel operation, saving some code. 1934 */ 1935int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1936{ 1937 unsigned int val; 1938 int ret; 1939 1940 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1941 if (ret != 0) 1942 return ret; 1943 1944 val &= rdev->desc->vsel_mask; 1945 val >>= ffs(rdev->desc->vsel_mask) - 1; 1946 1947 return val; 1948} 1949EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1950 1951/** 1952 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1953 * 1954 * @rdev: regulator to operate on 1955 * @sel: Selector to set 1956 * 1957 * Regulators that use regmap for their register I/O can set the 1958 * vsel_reg and vsel_mask fields in their descriptor and then use this 1959 * as their set_voltage_vsel operation, saving some code. 1960 */ 1961int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 1962{ 1963 sel <<= ffs(rdev->desc->vsel_mask) - 1; 1964 1965 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 1966 rdev->desc->vsel_mask, sel); 1967} 1968EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 1969 1970/** 1971 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 1972 * 1973 * @rdev: Regulator to operate on 1974 * @min_uV: Lower bound for voltage 1975 * @max_uV: Upper bound for voltage 1976 * 1977 * Drivers implementing set_voltage_sel() and list_voltage() can use 1978 * this as their map_voltage() operation. It will find a suitable 1979 * voltage by calling list_voltage() until it gets something in bounds 1980 * for the requested voltages. 1981 */ 1982int regulator_map_voltage_iterate(struct regulator_dev *rdev, 1983 int min_uV, int max_uV) 1984{ 1985 int best_val = INT_MAX; 1986 int selector = 0; 1987 int i, ret; 1988 1989 /* Find the smallest voltage that falls within the specified 1990 * range. 1991 */ 1992 for (i = 0; i < rdev->desc->n_voltages; i++) { 1993 ret = rdev->desc->ops->list_voltage(rdev, i); 1994 if (ret < 0) 1995 continue; 1996 1997 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1998 best_val = ret; 1999 selector = i; 2000 } 2001 } 2002 2003 if (best_val != INT_MAX) 2004 return selector; 2005 else 2006 return -EINVAL; 2007} 2008EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2009 2010static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2011 int min_uV, int max_uV) 2012{ 2013 int ret; 2014 int delay = 0; 2015 int best_val; 2016 unsigned int selector; 2017 int old_selector = -1; 2018 2019 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2020 2021 min_uV += rdev->constraints->uV_offset; 2022 max_uV += rdev->constraints->uV_offset; 2023 2024 /* 2025 * If we can't obtain the old selector there is not enough 2026 * info to call set_voltage_time_sel(). 2027 */ 2028 if (rdev->desc->ops->set_voltage_time_sel && 2029 rdev->desc->ops->get_voltage_sel) { 2030 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2031 if (old_selector < 0) 2032 return old_selector; 2033 } 2034 2035 if (rdev->desc->ops->set_voltage) { 2036 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2037 &selector); 2038 } else if (rdev->desc->ops->set_voltage_sel) { 2039 if (rdev->desc->ops->map_voltage) 2040 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2041 max_uV); 2042 else 2043 ret = regulator_map_voltage_iterate(rdev, min_uV, 2044 max_uV); 2045 2046 if (ret >= 0) { 2047 selector = ret; 2048 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2049 } 2050 } else { 2051 ret = -EINVAL; 2052 } 2053 2054 if (rdev->desc->ops->list_voltage) 2055 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2056 else 2057 best_val = -1; 2058 2059 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2060 if (ret == 0 && old_selector >= 0 && 2061 rdev->desc->ops->set_voltage_time_sel) { 2062 2063 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2064 old_selector, selector); 2065 if (delay < 0) { 2066 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2067 delay); 2068 delay = 0; 2069 } 2070 } 2071 2072 /* Insert any necessary delays */ 2073 if (delay >= 1000) { 2074 mdelay(delay / 1000); 2075 udelay(delay % 1000); 2076 } else if (delay) { 2077 udelay(delay); 2078 } 2079 2080 if (ret == 0) 2081 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2082 NULL); 2083 2084 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2085 2086 return ret; 2087} 2088 2089/** 2090 * regulator_set_voltage - set regulator output voltage 2091 * @regulator: regulator source 2092 * @min_uV: Minimum required voltage in uV 2093 * @max_uV: Maximum acceptable voltage in uV 2094 * 2095 * Sets a voltage regulator to the desired output voltage. This can be set 2096 * during any regulator state. IOW, regulator can be disabled or enabled. 2097 * 2098 * If the regulator is enabled then the voltage will change to the new value 2099 * immediately otherwise if the regulator is disabled the regulator will 2100 * output at the new voltage when enabled. 2101 * 2102 * NOTE: If the regulator is shared between several devices then the lowest 2103 * request voltage that meets the system constraints will be used. 2104 * Regulator system constraints must be set for this regulator before 2105 * calling this function otherwise this call will fail. 2106 */ 2107int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2108{ 2109 struct regulator_dev *rdev = regulator->rdev; 2110 int ret = 0; 2111 2112 mutex_lock(&rdev->mutex); 2113 2114 /* If we're setting the same range as last time the change 2115 * should be a noop (some cpufreq implementations use the same 2116 * voltage for multiple frequencies, for example). 2117 */ 2118 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2119 goto out; 2120 2121 /* sanity check */ 2122 if (!rdev->desc->ops->set_voltage && 2123 !rdev->desc->ops->set_voltage_sel) { 2124 ret = -EINVAL; 2125 goto out; 2126 } 2127 2128 /* constraints check */ 2129 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2130 if (ret < 0) 2131 goto out; 2132 regulator->min_uV = min_uV; 2133 regulator->max_uV = max_uV; 2134 2135 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2136 if (ret < 0) 2137 goto out; 2138 2139 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2140 2141out: 2142 mutex_unlock(&rdev->mutex); 2143 return ret; 2144} 2145EXPORT_SYMBOL_GPL(regulator_set_voltage); 2146 2147/** 2148 * regulator_set_voltage_time - get raise/fall time 2149 * @regulator: regulator source 2150 * @old_uV: starting voltage in microvolts 2151 * @new_uV: target voltage in microvolts 2152 * 2153 * Provided with the starting and ending voltage, this function attempts to 2154 * calculate the time in microseconds required to rise or fall to this new 2155 * voltage. 2156 */ 2157int regulator_set_voltage_time(struct regulator *regulator, 2158 int old_uV, int new_uV) 2159{ 2160 struct regulator_dev *rdev = regulator->rdev; 2161 struct regulator_ops *ops = rdev->desc->ops; 2162 int old_sel = -1; 2163 int new_sel = -1; 2164 int voltage; 2165 int i; 2166 2167 /* Currently requires operations to do this */ 2168 if (!ops->list_voltage || !ops->set_voltage_time_sel 2169 || !rdev->desc->n_voltages) 2170 return -EINVAL; 2171 2172 for (i = 0; i < rdev->desc->n_voltages; i++) { 2173 /* We only look for exact voltage matches here */ 2174 voltage = regulator_list_voltage(regulator, i); 2175 if (voltage < 0) 2176 return -EINVAL; 2177 if (voltage == 0) 2178 continue; 2179 if (voltage == old_uV) 2180 old_sel = i; 2181 if (voltage == new_uV) 2182 new_sel = i; 2183 } 2184 2185 if (old_sel < 0 || new_sel < 0) 2186 return -EINVAL; 2187 2188 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2189} 2190EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2191 2192/** 2193 * regulator_sync_voltage - re-apply last regulator output voltage 2194 * @regulator: regulator source 2195 * 2196 * Re-apply the last configured voltage. This is intended to be used 2197 * where some external control source the consumer is cooperating with 2198 * has caused the configured voltage to change. 2199 */ 2200int regulator_sync_voltage(struct regulator *regulator) 2201{ 2202 struct regulator_dev *rdev = regulator->rdev; 2203 int ret, min_uV, max_uV; 2204 2205 mutex_lock(&rdev->mutex); 2206 2207 if (!rdev->desc->ops->set_voltage && 2208 !rdev->desc->ops->set_voltage_sel) { 2209 ret = -EINVAL; 2210 goto out; 2211 } 2212 2213 /* This is only going to work if we've had a voltage configured. */ 2214 if (!regulator->min_uV && !regulator->max_uV) { 2215 ret = -EINVAL; 2216 goto out; 2217 } 2218 2219 min_uV = regulator->min_uV; 2220 max_uV = regulator->max_uV; 2221 2222 /* This should be a paranoia check... */ 2223 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2224 if (ret < 0) 2225 goto out; 2226 2227 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2228 if (ret < 0) 2229 goto out; 2230 2231 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2232 2233out: 2234 mutex_unlock(&rdev->mutex); 2235 return ret; 2236} 2237EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2238 2239static int _regulator_get_voltage(struct regulator_dev *rdev) 2240{ 2241 int sel, ret; 2242 2243 if (rdev->desc->ops->get_voltage_sel) { 2244 sel = rdev->desc->ops->get_voltage_sel(rdev); 2245 if (sel < 0) 2246 return sel; 2247 ret = rdev->desc->ops->list_voltage(rdev, sel); 2248 } else if (rdev->desc->ops->get_voltage) { 2249 ret = rdev->desc->ops->get_voltage(rdev); 2250 } else { 2251 return -EINVAL; 2252 } 2253 2254 if (ret < 0) 2255 return ret; 2256 return ret - rdev->constraints->uV_offset; 2257} 2258 2259/** 2260 * regulator_get_voltage - get regulator output voltage 2261 * @regulator: regulator source 2262 * 2263 * This returns the current regulator voltage in uV. 2264 * 2265 * NOTE: If the regulator is disabled it will return the voltage value. This 2266 * function should not be used to determine regulator state. 2267 */ 2268int regulator_get_voltage(struct regulator *regulator) 2269{ 2270 int ret; 2271 2272 mutex_lock(®ulator->rdev->mutex); 2273 2274 ret = _regulator_get_voltage(regulator->rdev); 2275 2276 mutex_unlock(®ulator->rdev->mutex); 2277 2278 return ret; 2279} 2280EXPORT_SYMBOL_GPL(regulator_get_voltage); 2281 2282/** 2283 * regulator_set_current_limit - set regulator output current limit 2284 * @regulator: regulator source 2285 * @min_uA: Minimuum supported current in uA 2286 * @max_uA: Maximum supported current in uA 2287 * 2288 * Sets current sink to the desired output current. This can be set during 2289 * any regulator state. IOW, regulator can be disabled or enabled. 2290 * 2291 * If the regulator is enabled then the current will change to the new value 2292 * immediately otherwise if the regulator is disabled the regulator will 2293 * output at the new current when enabled. 2294 * 2295 * NOTE: Regulator system constraints must be set for this regulator before 2296 * calling this function otherwise this call will fail. 2297 */ 2298int regulator_set_current_limit(struct regulator *regulator, 2299 int min_uA, int max_uA) 2300{ 2301 struct regulator_dev *rdev = regulator->rdev; 2302 int ret; 2303 2304 mutex_lock(&rdev->mutex); 2305 2306 /* sanity check */ 2307 if (!rdev->desc->ops->set_current_limit) { 2308 ret = -EINVAL; 2309 goto out; 2310 } 2311 2312 /* constraints check */ 2313 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2314 if (ret < 0) 2315 goto out; 2316 2317 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2318out: 2319 mutex_unlock(&rdev->mutex); 2320 return ret; 2321} 2322EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2323 2324static int _regulator_get_current_limit(struct regulator_dev *rdev) 2325{ 2326 int ret; 2327 2328 mutex_lock(&rdev->mutex); 2329 2330 /* sanity check */ 2331 if (!rdev->desc->ops->get_current_limit) { 2332 ret = -EINVAL; 2333 goto out; 2334 } 2335 2336 ret = rdev->desc->ops->get_current_limit(rdev); 2337out: 2338 mutex_unlock(&rdev->mutex); 2339 return ret; 2340} 2341 2342/** 2343 * regulator_get_current_limit - get regulator output current 2344 * @regulator: regulator source 2345 * 2346 * This returns the current supplied by the specified current sink in uA. 2347 * 2348 * NOTE: If the regulator is disabled it will return the current value. This 2349 * function should not be used to determine regulator state. 2350 */ 2351int regulator_get_current_limit(struct regulator *regulator) 2352{ 2353 return _regulator_get_current_limit(regulator->rdev); 2354} 2355EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2356 2357/** 2358 * regulator_set_mode - set regulator operating mode 2359 * @regulator: regulator source 2360 * @mode: operating mode - one of the REGULATOR_MODE constants 2361 * 2362 * Set regulator operating mode to increase regulator efficiency or improve 2363 * regulation performance. 2364 * 2365 * NOTE: Regulator system constraints must be set for this regulator before 2366 * calling this function otherwise this call will fail. 2367 */ 2368int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2369{ 2370 struct regulator_dev *rdev = regulator->rdev; 2371 int ret; 2372 int regulator_curr_mode; 2373 2374 mutex_lock(&rdev->mutex); 2375 2376 /* sanity check */ 2377 if (!rdev->desc->ops->set_mode) { 2378 ret = -EINVAL; 2379 goto out; 2380 } 2381 2382 /* return if the same mode is requested */ 2383 if (rdev->desc->ops->get_mode) { 2384 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2385 if (regulator_curr_mode == mode) { 2386 ret = 0; 2387 goto out; 2388 } 2389 } 2390 2391 /* constraints check */ 2392 ret = regulator_mode_constrain(rdev, &mode); 2393 if (ret < 0) 2394 goto out; 2395 2396 ret = rdev->desc->ops->set_mode(rdev, mode); 2397out: 2398 mutex_unlock(&rdev->mutex); 2399 return ret; 2400} 2401EXPORT_SYMBOL_GPL(regulator_set_mode); 2402 2403static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2404{ 2405 int ret; 2406 2407 mutex_lock(&rdev->mutex); 2408 2409 /* sanity check */ 2410 if (!rdev->desc->ops->get_mode) { 2411 ret = -EINVAL; 2412 goto out; 2413 } 2414 2415 ret = rdev->desc->ops->get_mode(rdev); 2416out: 2417 mutex_unlock(&rdev->mutex); 2418 return ret; 2419} 2420 2421/** 2422 * regulator_get_mode - get regulator operating mode 2423 * @regulator: regulator source 2424 * 2425 * Get the current regulator operating mode. 2426 */ 2427unsigned int regulator_get_mode(struct regulator *regulator) 2428{ 2429 return _regulator_get_mode(regulator->rdev); 2430} 2431EXPORT_SYMBOL_GPL(regulator_get_mode); 2432 2433/** 2434 * regulator_set_optimum_mode - set regulator optimum operating mode 2435 * @regulator: regulator source 2436 * @uA_load: load current 2437 * 2438 * Notifies the regulator core of a new device load. This is then used by 2439 * DRMS (if enabled by constraints) to set the most efficient regulator 2440 * operating mode for the new regulator loading. 2441 * 2442 * Consumer devices notify their supply regulator of the maximum power 2443 * they will require (can be taken from device datasheet in the power 2444 * consumption tables) when they change operational status and hence power 2445 * state. Examples of operational state changes that can affect power 2446 * consumption are :- 2447 * 2448 * o Device is opened / closed. 2449 * o Device I/O is about to begin or has just finished. 2450 * o Device is idling in between work. 2451 * 2452 * This information is also exported via sysfs to userspace. 2453 * 2454 * DRMS will sum the total requested load on the regulator and change 2455 * to the most efficient operating mode if platform constraints allow. 2456 * 2457 * Returns the new regulator mode or error. 2458 */ 2459int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2460{ 2461 struct regulator_dev *rdev = regulator->rdev; 2462 struct regulator *consumer; 2463 int ret, output_uV, input_uV, total_uA_load = 0; 2464 unsigned int mode; 2465 2466 mutex_lock(&rdev->mutex); 2467 2468 /* 2469 * first check to see if we can set modes at all, otherwise just 2470 * tell the consumer everything is OK. 2471 */ 2472 regulator->uA_load = uA_load; 2473 ret = regulator_check_drms(rdev); 2474 if (ret < 0) { 2475 ret = 0; 2476 goto out; 2477 } 2478 2479 if (!rdev->desc->ops->get_optimum_mode) 2480 goto out; 2481 2482 /* 2483 * we can actually do this so any errors are indicators of 2484 * potential real failure. 2485 */ 2486 ret = -EINVAL; 2487 2488 if (!rdev->desc->ops->set_mode) 2489 goto out; 2490 2491 /* get output voltage */ 2492 output_uV = _regulator_get_voltage(rdev); 2493 if (output_uV <= 0) { 2494 rdev_err(rdev, "invalid output voltage found\n"); 2495 goto out; 2496 } 2497 2498 /* get input voltage */ 2499 input_uV = 0; 2500 if (rdev->supply) 2501 input_uV = regulator_get_voltage(rdev->supply); 2502 if (input_uV <= 0) 2503 input_uV = rdev->constraints->input_uV; 2504 if (input_uV <= 0) { 2505 rdev_err(rdev, "invalid input voltage found\n"); 2506 goto out; 2507 } 2508 2509 /* calc total requested load for this regulator */ 2510 list_for_each_entry(consumer, &rdev->consumer_list, list) 2511 total_uA_load += consumer->uA_load; 2512 2513 mode = rdev->desc->ops->get_optimum_mode(rdev, 2514 input_uV, output_uV, 2515 total_uA_load); 2516 ret = regulator_mode_constrain(rdev, &mode); 2517 if (ret < 0) { 2518 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2519 total_uA_load, input_uV, output_uV); 2520 goto out; 2521 } 2522 2523 ret = rdev->desc->ops->set_mode(rdev, mode); 2524 if (ret < 0) { 2525 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2526 goto out; 2527 } 2528 ret = mode; 2529out: 2530 mutex_unlock(&rdev->mutex); 2531 return ret; 2532} 2533EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2534 2535/** 2536 * regulator_register_notifier - register regulator event notifier 2537 * @regulator: regulator source 2538 * @nb: notifier block 2539 * 2540 * Register notifier block to receive regulator events. 2541 */ 2542int regulator_register_notifier(struct regulator *regulator, 2543 struct notifier_block *nb) 2544{ 2545 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2546 nb); 2547} 2548EXPORT_SYMBOL_GPL(regulator_register_notifier); 2549 2550/** 2551 * regulator_unregister_notifier - unregister regulator event notifier 2552 * @regulator: regulator source 2553 * @nb: notifier block 2554 * 2555 * Unregister regulator event notifier block. 2556 */ 2557int regulator_unregister_notifier(struct regulator *regulator, 2558 struct notifier_block *nb) 2559{ 2560 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2561 nb); 2562} 2563EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2564 2565/* notify regulator consumers and downstream regulator consumers. 2566 * Note mutex must be held by caller. 2567 */ 2568static void _notifier_call_chain(struct regulator_dev *rdev, 2569 unsigned long event, void *data) 2570{ 2571 /* call rdev chain first */ 2572 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2573} 2574 2575/** 2576 * regulator_bulk_get - get multiple regulator consumers 2577 * 2578 * @dev: Device to supply 2579 * @num_consumers: Number of consumers to register 2580 * @consumers: Configuration of consumers; clients are stored here. 2581 * 2582 * @return 0 on success, an errno on failure. 2583 * 2584 * This helper function allows drivers to get several regulator 2585 * consumers in one operation. If any of the regulators cannot be 2586 * acquired then any regulators that were allocated will be freed 2587 * before returning to the caller. 2588 */ 2589int regulator_bulk_get(struct device *dev, int num_consumers, 2590 struct regulator_bulk_data *consumers) 2591{ 2592 int i; 2593 int ret; 2594 2595 for (i = 0; i < num_consumers; i++) 2596 consumers[i].consumer = NULL; 2597 2598 for (i = 0; i < num_consumers; i++) { 2599 consumers[i].consumer = regulator_get(dev, 2600 consumers[i].supply); 2601 if (IS_ERR(consumers[i].consumer)) { 2602 ret = PTR_ERR(consumers[i].consumer); 2603 dev_err(dev, "Failed to get supply '%s': %d\n", 2604 consumers[i].supply, ret); 2605 consumers[i].consumer = NULL; 2606 goto err; 2607 } 2608 } 2609 2610 return 0; 2611 2612err: 2613 while (--i >= 0) 2614 regulator_put(consumers[i].consumer); 2615 2616 return ret; 2617} 2618EXPORT_SYMBOL_GPL(regulator_bulk_get); 2619 2620/** 2621 * devm_regulator_bulk_get - managed get multiple regulator consumers 2622 * 2623 * @dev: Device to supply 2624 * @num_consumers: Number of consumers to register 2625 * @consumers: Configuration of consumers; clients are stored here. 2626 * 2627 * @return 0 on success, an errno on failure. 2628 * 2629 * This helper function allows drivers to get several regulator 2630 * consumers in one operation with management, the regulators will 2631 * automatically be freed when the device is unbound. If any of the 2632 * regulators cannot be acquired then any regulators that were 2633 * allocated will be freed before returning to the caller. 2634 */ 2635int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2636 struct regulator_bulk_data *consumers) 2637{ 2638 int i; 2639 int ret; 2640 2641 for (i = 0; i < num_consumers; i++) 2642 consumers[i].consumer = NULL; 2643 2644 for (i = 0; i < num_consumers; i++) { 2645 consumers[i].consumer = devm_regulator_get(dev, 2646 consumers[i].supply); 2647 if (IS_ERR(consumers[i].consumer)) { 2648 ret = PTR_ERR(consumers[i].consumer); 2649 dev_err(dev, "Failed to get supply '%s': %d\n", 2650 consumers[i].supply, ret); 2651 consumers[i].consumer = NULL; 2652 goto err; 2653 } 2654 } 2655 2656 return 0; 2657 2658err: 2659 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2660 devm_regulator_put(consumers[i].consumer); 2661 2662 return ret; 2663} 2664EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2665 2666static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2667{ 2668 struct regulator_bulk_data *bulk = data; 2669 2670 bulk->ret = regulator_enable(bulk->consumer); 2671} 2672 2673/** 2674 * regulator_bulk_enable - enable multiple regulator consumers 2675 * 2676 * @num_consumers: Number of consumers 2677 * @consumers: Consumer data; clients are stored here. 2678 * @return 0 on success, an errno on failure 2679 * 2680 * This convenience API allows consumers to enable multiple regulator 2681 * clients in a single API call. If any consumers cannot be enabled 2682 * then any others that were enabled will be disabled again prior to 2683 * return. 2684 */ 2685int regulator_bulk_enable(int num_consumers, 2686 struct regulator_bulk_data *consumers) 2687{ 2688 LIST_HEAD(async_domain); 2689 int i; 2690 int ret = 0; 2691 2692 for (i = 0; i < num_consumers; i++) { 2693 if (consumers[i].consumer->always_on) 2694 consumers[i].ret = 0; 2695 else 2696 async_schedule_domain(regulator_bulk_enable_async, 2697 &consumers[i], &async_domain); 2698 } 2699 2700 async_synchronize_full_domain(&async_domain); 2701 2702 /* If any consumer failed we need to unwind any that succeeded */ 2703 for (i = 0; i < num_consumers; i++) { 2704 if (consumers[i].ret != 0) { 2705 ret = consumers[i].ret; 2706 goto err; 2707 } 2708 } 2709 2710 return 0; 2711 2712err: 2713 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2714 while (--i >= 0) 2715 regulator_disable(consumers[i].consumer); 2716 2717 return ret; 2718} 2719EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2720 2721/** 2722 * regulator_bulk_disable - disable multiple regulator consumers 2723 * 2724 * @num_consumers: Number of consumers 2725 * @consumers: Consumer data; clients are stored here. 2726 * @return 0 on success, an errno on failure 2727 * 2728 * This convenience API allows consumers to disable multiple regulator 2729 * clients in a single API call. If any consumers cannot be disabled 2730 * then any others that were disabled will be enabled again prior to 2731 * return. 2732 */ 2733int regulator_bulk_disable(int num_consumers, 2734 struct regulator_bulk_data *consumers) 2735{ 2736 int i; 2737 int ret, r; 2738 2739 for (i = num_consumers - 1; i >= 0; --i) { 2740 ret = regulator_disable(consumers[i].consumer); 2741 if (ret != 0) 2742 goto err; 2743 } 2744 2745 return 0; 2746 2747err: 2748 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2749 for (++i; i < num_consumers; ++i) { 2750 r = regulator_enable(consumers[i].consumer); 2751 if (r != 0) 2752 pr_err("Failed to reename %s: %d\n", 2753 consumers[i].supply, r); 2754 } 2755 2756 return ret; 2757} 2758EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2759 2760/** 2761 * regulator_bulk_force_disable - force disable multiple regulator consumers 2762 * 2763 * @num_consumers: Number of consumers 2764 * @consumers: Consumer data; clients are stored here. 2765 * @return 0 on success, an errno on failure 2766 * 2767 * This convenience API allows consumers to forcibly disable multiple regulator 2768 * clients in a single API call. 2769 * NOTE: This should be used for situations when device damage will 2770 * likely occur if the regulators are not disabled (e.g. over temp). 2771 * Although regulator_force_disable function call for some consumers can 2772 * return error numbers, the function is called for all consumers. 2773 */ 2774int regulator_bulk_force_disable(int num_consumers, 2775 struct regulator_bulk_data *consumers) 2776{ 2777 int i; 2778 int ret; 2779 2780 for (i = 0; i < num_consumers; i++) 2781 consumers[i].ret = 2782 regulator_force_disable(consumers[i].consumer); 2783 2784 for (i = 0; i < num_consumers; i++) { 2785 if (consumers[i].ret != 0) { 2786 ret = consumers[i].ret; 2787 goto out; 2788 } 2789 } 2790 2791 return 0; 2792out: 2793 return ret; 2794} 2795EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2796 2797/** 2798 * regulator_bulk_free - free multiple regulator consumers 2799 * 2800 * @num_consumers: Number of consumers 2801 * @consumers: Consumer data; clients are stored here. 2802 * 2803 * This convenience API allows consumers to free multiple regulator 2804 * clients in a single API call. 2805 */ 2806void regulator_bulk_free(int num_consumers, 2807 struct regulator_bulk_data *consumers) 2808{ 2809 int i; 2810 2811 for (i = 0; i < num_consumers; i++) { 2812 regulator_put(consumers[i].consumer); 2813 consumers[i].consumer = NULL; 2814 } 2815} 2816EXPORT_SYMBOL_GPL(regulator_bulk_free); 2817 2818/** 2819 * regulator_notifier_call_chain - call regulator event notifier 2820 * @rdev: regulator source 2821 * @event: notifier block 2822 * @data: callback-specific data. 2823 * 2824 * Called by regulator drivers to notify clients a regulator event has 2825 * occurred. We also notify regulator clients downstream. 2826 * Note lock must be held by caller. 2827 */ 2828int regulator_notifier_call_chain(struct regulator_dev *rdev, 2829 unsigned long event, void *data) 2830{ 2831 _notifier_call_chain(rdev, event, data); 2832 return NOTIFY_DONE; 2833 2834} 2835EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2836 2837/** 2838 * regulator_mode_to_status - convert a regulator mode into a status 2839 * 2840 * @mode: Mode to convert 2841 * 2842 * Convert a regulator mode into a status. 2843 */ 2844int regulator_mode_to_status(unsigned int mode) 2845{ 2846 switch (mode) { 2847 case REGULATOR_MODE_FAST: 2848 return REGULATOR_STATUS_FAST; 2849 case REGULATOR_MODE_NORMAL: 2850 return REGULATOR_STATUS_NORMAL; 2851 case REGULATOR_MODE_IDLE: 2852 return REGULATOR_STATUS_IDLE; 2853 case REGULATOR_STATUS_STANDBY: 2854 return REGULATOR_STATUS_STANDBY; 2855 default: 2856 return 0; 2857 } 2858} 2859EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2860 2861/* 2862 * To avoid cluttering sysfs (and memory) with useless state, only 2863 * create attributes that can be meaningfully displayed. 2864 */ 2865static int add_regulator_attributes(struct regulator_dev *rdev) 2866{ 2867 struct device *dev = &rdev->dev; 2868 struct regulator_ops *ops = rdev->desc->ops; 2869 int status = 0; 2870 2871 /* some attributes need specific methods to be displayed */ 2872 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2873 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2874 status = device_create_file(dev, &dev_attr_microvolts); 2875 if (status < 0) 2876 return status; 2877 } 2878 if (ops->get_current_limit) { 2879 status = device_create_file(dev, &dev_attr_microamps); 2880 if (status < 0) 2881 return status; 2882 } 2883 if (ops->get_mode) { 2884 status = device_create_file(dev, &dev_attr_opmode); 2885 if (status < 0) 2886 return status; 2887 } 2888 if (ops->is_enabled) { 2889 status = device_create_file(dev, &dev_attr_state); 2890 if (status < 0) 2891 return status; 2892 } 2893 if (ops->get_status) { 2894 status = device_create_file(dev, &dev_attr_status); 2895 if (status < 0) 2896 return status; 2897 } 2898 2899 /* some attributes are type-specific */ 2900 if (rdev->desc->type == REGULATOR_CURRENT) { 2901 status = device_create_file(dev, &dev_attr_requested_microamps); 2902 if (status < 0) 2903 return status; 2904 } 2905 2906 /* all the other attributes exist to support constraints; 2907 * don't show them if there are no constraints, or if the 2908 * relevant supporting methods are missing. 2909 */ 2910 if (!rdev->constraints) 2911 return status; 2912 2913 /* constraints need specific supporting methods */ 2914 if (ops->set_voltage || ops->set_voltage_sel) { 2915 status = device_create_file(dev, &dev_attr_min_microvolts); 2916 if (status < 0) 2917 return status; 2918 status = device_create_file(dev, &dev_attr_max_microvolts); 2919 if (status < 0) 2920 return status; 2921 } 2922 if (ops->set_current_limit) { 2923 status = device_create_file(dev, &dev_attr_min_microamps); 2924 if (status < 0) 2925 return status; 2926 status = device_create_file(dev, &dev_attr_max_microamps); 2927 if (status < 0) 2928 return status; 2929 } 2930 2931 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2932 if (status < 0) 2933 return status; 2934 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2935 if (status < 0) 2936 return status; 2937 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2938 if (status < 0) 2939 return status; 2940 2941 if (ops->set_suspend_voltage) { 2942 status = device_create_file(dev, 2943 &dev_attr_suspend_standby_microvolts); 2944 if (status < 0) 2945 return status; 2946 status = device_create_file(dev, 2947 &dev_attr_suspend_mem_microvolts); 2948 if (status < 0) 2949 return status; 2950 status = device_create_file(dev, 2951 &dev_attr_suspend_disk_microvolts); 2952 if (status < 0) 2953 return status; 2954 } 2955 2956 if (ops->set_suspend_mode) { 2957 status = device_create_file(dev, 2958 &dev_attr_suspend_standby_mode); 2959 if (status < 0) 2960 return status; 2961 status = device_create_file(dev, 2962 &dev_attr_suspend_mem_mode); 2963 if (status < 0) 2964 return status; 2965 status = device_create_file(dev, 2966 &dev_attr_suspend_disk_mode); 2967 if (status < 0) 2968 return status; 2969 } 2970 2971 return status; 2972} 2973 2974static void rdev_init_debugfs(struct regulator_dev *rdev) 2975{ 2976 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2977 if (!rdev->debugfs) { 2978 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2979 return; 2980 } 2981 2982 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2983 &rdev->use_count); 2984 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2985 &rdev->open_count); 2986} 2987 2988/** 2989 * regulator_register - register regulator 2990 * @regulator_desc: regulator to register 2991 * @config: runtime configuration for regulator 2992 * 2993 * Called by regulator drivers to register a regulator. 2994 * Returns 0 on success. 2995 */ 2996struct regulator_dev * 2997regulator_register(const struct regulator_desc *regulator_desc, 2998 const struct regulator_config *config) 2999{ 3000 const struct regulation_constraints *constraints = NULL; 3001 const struct regulator_init_data *init_data; 3002 static atomic_t regulator_no = ATOMIC_INIT(0); 3003 struct regulator_dev *rdev; 3004 struct device *dev; 3005 int ret, i; 3006 const char *supply = NULL; 3007 3008 if (regulator_desc == NULL || config == NULL) 3009 return ERR_PTR(-EINVAL); 3010 3011 dev = config->dev; 3012 WARN_ON(!dev); 3013 3014 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3015 return ERR_PTR(-EINVAL); 3016 3017 if (regulator_desc->type != REGULATOR_VOLTAGE && 3018 regulator_desc->type != REGULATOR_CURRENT) 3019 return ERR_PTR(-EINVAL); 3020 3021 /* Only one of each should be implemented */ 3022 WARN_ON(regulator_desc->ops->get_voltage && 3023 regulator_desc->ops->get_voltage_sel); 3024 WARN_ON(regulator_desc->ops->set_voltage && 3025 regulator_desc->ops->set_voltage_sel); 3026 3027 /* If we're using selectors we must implement list_voltage. */ 3028 if (regulator_desc->ops->get_voltage_sel && 3029 !regulator_desc->ops->list_voltage) { 3030 return ERR_PTR(-EINVAL); 3031 } 3032 if (regulator_desc->ops->set_voltage_sel && 3033 !regulator_desc->ops->list_voltage) { 3034 return ERR_PTR(-EINVAL); 3035 } 3036 3037 init_data = config->init_data; 3038 3039 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3040 if (rdev == NULL) 3041 return ERR_PTR(-ENOMEM); 3042 3043 mutex_lock(®ulator_list_mutex); 3044 3045 mutex_init(&rdev->mutex); 3046 rdev->reg_data = config->driver_data; 3047 rdev->owner = regulator_desc->owner; 3048 rdev->desc = regulator_desc; 3049 rdev->regmap = config->regmap; 3050 INIT_LIST_HEAD(&rdev->consumer_list); 3051 INIT_LIST_HEAD(&rdev->list); 3052 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3053 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3054 3055 /* preform any regulator specific init */ 3056 if (init_data && init_data->regulator_init) { 3057 ret = init_data->regulator_init(rdev->reg_data); 3058 if (ret < 0) 3059 goto clean; 3060 } 3061 3062 /* register with sysfs */ 3063 rdev->dev.class = ®ulator_class; 3064 rdev->dev.of_node = config->of_node; 3065 rdev->dev.parent = dev; 3066 dev_set_name(&rdev->dev, "regulator.%d", 3067 atomic_inc_return(®ulator_no) - 1); 3068 ret = device_register(&rdev->dev); 3069 if (ret != 0) { 3070 put_device(&rdev->dev); 3071 goto clean; 3072 } 3073 3074 dev_set_drvdata(&rdev->dev, rdev); 3075 3076 /* set regulator constraints */ 3077 if (init_data) 3078 constraints = &init_data->constraints; 3079 3080 ret = set_machine_constraints(rdev, constraints); 3081 if (ret < 0) 3082 goto scrub; 3083 3084 /* add attributes supported by this regulator */ 3085 ret = add_regulator_attributes(rdev); 3086 if (ret < 0) 3087 goto scrub; 3088 3089 if (init_data && init_data->supply_regulator) 3090 supply = init_data->supply_regulator; 3091 else if (regulator_desc->supply_name) 3092 supply = regulator_desc->supply_name; 3093 3094 if (supply) { 3095 struct regulator_dev *r; 3096 3097 r = regulator_dev_lookup(dev, supply, &ret); 3098 3099 if (!r) { 3100 dev_err(dev, "Failed to find supply %s\n", supply); 3101 ret = -EPROBE_DEFER; 3102 goto scrub; 3103 } 3104 3105 ret = set_supply(rdev, r); 3106 if (ret < 0) 3107 goto scrub; 3108 3109 /* Enable supply if rail is enabled */ 3110 if (rdev->desc->ops->is_enabled && 3111 rdev->desc->ops->is_enabled(rdev)) { 3112 ret = regulator_enable(rdev->supply); 3113 if (ret < 0) 3114 goto scrub; 3115 } 3116 } 3117 3118 /* add consumers devices */ 3119 if (init_data) { 3120 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3121 ret = set_consumer_device_supply(rdev, 3122 init_data->consumer_supplies[i].dev_name, 3123 init_data->consumer_supplies[i].supply); 3124 if (ret < 0) { 3125 dev_err(dev, "Failed to set supply %s\n", 3126 init_data->consumer_supplies[i].supply); 3127 goto unset_supplies; 3128 } 3129 } 3130 } 3131 3132 list_add(&rdev->list, ®ulator_list); 3133 3134 rdev_init_debugfs(rdev); 3135out: 3136 mutex_unlock(®ulator_list_mutex); 3137 return rdev; 3138 3139unset_supplies: 3140 unset_regulator_supplies(rdev); 3141 3142scrub: 3143 kfree(rdev->constraints); 3144 device_unregister(&rdev->dev); 3145 /* device core frees rdev */ 3146 rdev = ERR_PTR(ret); 3147 goto out; 3148 3149clean: 3150 kfree(rdev); 3151 rdev = ERR_PTR(ret); 3152 goto out; 3153} 3154EXPORT_SYMBOL_GPL(regulator_register); 3155 3156/** 3157 * regulator_unregister - unregister regulator 3158 * @rdev: regulator to unregister 3159 * 3160 * Called by regulator drivers to unregister a regulator. 3161 */ 3162void regulator_unregister(struct regulator_dev *rdev) 3163{ 3164 if (rdev == NULL) 3165 return; 3166 3167 if (rdev->supply) 3168 regulator_put(rdev->supply); 3169 mutex_lock(®ulator_list_mutex); 3170 debugfs_remove_recursive(rdev->debugfs); 3171 flush_work_sync(&rdev->disable_work.work); 3172 WARN_ON(rdev->open_count); 3173 unset_regulator_supplies(rdev); 3174 list_del(&rdev->list); 3175 kfree(rdev->constraints); 3176 device_unregister(&rdev->dev); 3177 mutex_unlock(®ulator_list_mutex); 3178} 3179EXPORT_SYMBOL_GPL(regulator_unregister); 3180 3181/** 3182 * regulator_suspend_prepare - prepare regulators for system wide suspend 3183 * @state: system suspend state 3184 * 3185 * Configure each regulator with it's suspend operating parameters for state. 3186 * This will usually be called by machine suspend code prior to supending. 3187 */ 3188int regulator_suspend_prepare(suspend_state_t state) 3189{ 3190 struct regulator_dev *rdev; 3191 int ret = 0; 3192 3193 /* ON is handled by regulator active state */ 3194 if (state == PM_SUSPEND_ON) 3195 return -EINVAL; 3196 3197 mutex_lock(®ulator_list_mutex); 3198 list_for_each_entry(rdev, ®ulator_list, list) { 3199 3200 mutex_lock(&rdev->mutex); 3201 ret = suspend_prepare(rdev, state); 3202 mutex_unlock(&rdev->mutex); 3203 3204 if (ret < 0) { 3205 rdev_err(rdev, "failed to prepare\n"); 3206 goto out; 3207 } 3208 } 3209out: 3210 mutex_unlock(®ulator_list_mutex); 3211 return ret; 3212} 3213EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3214 3215/** 3216 * regulator_suspend_finish - resume regulators from system wide suspend 3217 * 3218 * Turn on regulators that might be turned off by regulator_suspend_prepare 3219 * and that should be turned on according to the regulators properties. 3220 */ 3221int regulator_suspend_finish(void) 3222{ 3223 struct regulator_dev *rdev; 3224 int ret = 0, error; 3225 3226 mutex_lock(®ulator_list_mutex); 3227 list_for_each_entry(rdev, ®ulator_list, list) { 3228 struct regulator_ops *ops = rdev->desc->ops; 3229 3230 mutex_lock(&rdev->mutex); 3231 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3232 ops->enable) { 3233 error = ops->enable(rdev); 3234 if (error) 3235 ret = error; 3236 } else { 3237 if (!has_full_constraints) 3238 goto unlock; 3239 if (!ops->disable) 3240 goto unlock; 3241 if (ops->is_enabled && !ops->is_enabled(rdev)) 3242 goto unlock; 3243 3244 error = ops->disable(rdev); 3245 if (error) 3246 ret = error; 3247 } 3248unlock: 3249 mutex_unlock(&rdev->mutex); 3250 } 3251 mutex_unlock(®ulator_list_mutex); 3252 return ret; 3253} 3254EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3255 3256/** 3257 * regulator_has_full_constraints - the system has fully specified constraints 3258 * 3259 * Calling this function will cause the regulator API to disable all 3260 * regulators which have a zero use count and don't have an always_on 3261 * constraint in a late_initcall. 3262 * 3263 * The intention is that this will become the default behaviour in a 3264 * future kernel release so users are encouraged to use this facility 3265 * now. 3266 */ 3267void regulator_has_full_constraints(void) 3268{ 3269 has_full_constraints = 1; 3270} 3271EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3272 3273/** 3274 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3275 * 3276 * Calling this function will cause the regulator API to provide a 3277 * dummy regulator to consumers if no physical regulator is found, 3278 * allowing most consumers to proceed as though a regulator were 3279 * configured. This allows systems such as those with software 3280 * controllable regulators for the CPU core only to be brought up more 3281 * readily. 3282 */ 3283void regulator_use_dummy_regulator(void) 3284{ 3285 board_wants_dummy_regulator = true; 3286} 3287EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3288 3289/** 3290 * rdev_get_drvdata - get rdev regulator driver data 3291 * @rdev: regulator 3292 * 3293 * Get rdev regulator driver private data. This call can be used in the 3294 * regulator driver context. 3295 */ 3296void *rdev_get_drvdata(struct regulator_dev *rdev) 3297{ 3298 return rdev->reg_data; 3299} 3300EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3301 3302/** 3303 * regulator_get_drvdata - get regulator driver data 3304 * @regulator: regulator 3305 * 3306 * Get regulator driver private data. This call can be used in the consumer 3307 * driver context when non API regulator specific functions need to be called. 3308 */ 3309void *regulator_get_drvdata(struct regulator *regulator) 3310{ 3311 return regulator->rdev->reg_data; 3312} 3313EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3314 3315/** 3316 * regulator_set_drvdata - set regulator driver data 3317 * @regulator: regulator 3318 * @data: data 3319 */ 3320void regulator_set_drvdata(struct regulator *regulator, void *data) 3321{ 3322 regulator->rdev->reg_data = data; 3323} 3324EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3325 3326/** 3327 * regulator_get_id - get regulator ID 3328 * @rdev: regulator 3329 */ 3330int rdev_get_id(struct regulator_dev *rdev) 3331{ 3332 return rdev->desc->id; 3333} 3334EXPORT_SYMBOL_GPL(rdev_get_id); 3335 3336struct device *rdev_get_dev(struct regulator_dev *rdev) 3337{ 3338 return &rdev->dev; 3339} 3340EXPORT_SYMBOL_GPL(rdev_get_dev); 3341 3342void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3343{ 3344 return reg_init_data->driver_data; 3345} 3346EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3347 3348#ifdef CONFIG_DEBUG_FS 3349static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3350 size_t count, loff_t *ppos) 3351{ 3352 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3353 ssize_t len, ret = 0; 3354 struct regulator_map *map; 3355 3356 if (!buf) 3357 return -ENOMEM; 3358 3359 list_for_each_entry(map, ®ulator_map_list, list) { 3360 len = snprintf(buf + ret, PAGE_SIZE - ret, 3361 "%s -> %s.%s\n", 3362 rdev_get_name(map->regulator), map->dev_name, 3363 map->supply); 3364 if (len >= 0) 3365 ret += len; 3366 if (ret > PAGE_SIZE) { 3367 ret = PAGE_SIZE; 3368 break; 3369 } 3370 } 3371 3372 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3373 3374 kfree(buf); 3375 3376 return ret; 3377} 3378#endif 3379 3380static const struct file_operations supply_map_fops = { 3381#ifdef CONFIG_DEBUG_FS 3382 .read = supply_map_read_file, 3383 .llseek = default_llseek, 3384#endif 3385}; 3386 3387static int __init regulator_init(void) 3388{ 3389 int ret; 3390 3391 ret = class_register(®ulator_class); 3392 3393 debugfs_root = debugfs_create_dir("regulator", NULL); 3394 if (!debugfs_root) 3395 pr_warn("regulator: Failed to create debugfs directory\n"); 3396 3397 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3398 &supply_map_fops); 3399 3400 regulator_dummy_init(); 3401 3402 return ret; 3403} 3404 3405/* init early to allow our consumers to complete system booting */ 3406core_initcall(regulator_init); 3407 3408static int __init regulator_init_complete(void) 3409{ 3410 struct regulator_dev *rdev; 3411 struct regulator_ops *ops; 3412 struct regulation_constraints *c; 3413 int enabled, ret; 3414 3415 mutex_lock(®ulator_list_mutex); 3416 3417 /* If we have a full configuration then disable any regulators 3418 * which are not in use or always_on. This will become the 3419 * default behaviour in the future. 3420 */ 3421 list_for_each_entry(rdev, ®ulator_list, list) { 3422 ops = rdev->desc->ops; 3423 c = rdev->constraints; 3424 3425 if (!ops->disable || (c && c->always_on)) 3426 continue; 3427 3428 mutex_lock(&rdev->mutex); 3429 3430 if (rdev->use_count) 3431 goto unlock; 3432 3433 /* If we can't read the status assume it's on. */ 3434 if (ops->is_enabled) 3435 enabled = ops->is_enabled(rdev); 3436 else 3437 enabled = 1; 3438 3439 if (!enabled) 3440 goto unlock; 3441 3442 if (has_full_constraints) { 3443 /* We log since this may kill the system if it 3444 * goes wrong. */ 3445 rdev_info(rdev, "disabling\n"); 3446 ret = ops->disable(rdev); 3447 if (ret != 0) { 3448 rdev_err(rdev, "couldn't disable: %d\n", ret); 3449 } 3450 } else { 3451 /* The intention is that in future we will 3452 * assume that full constraints are provided 3453 * so warn even if we aren't going to do 3454 * anything here. 3455 */ 3456 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3457 } 3458 3459unlock: 3460 mutex_unlock(&rdev->mutex); 3461 } 3462 3463 mutex_unlock(®ulator_list_mutex); 3464 3465 return 0; 3466} 3467late_initcall(regulator_init_complete); 3468