core.c revision ccfcb1c3cf5616ebd9c61e6c834af3b87fe6b7f7
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_linear - List voltages with simple calculation 1864 * 1865 * @rdev: Regulator device 1866 * @selector: Selector to convert into a voltage 1867 * 1868 * Regulators with a simple linear mapping between voltages and 1869 * selectors can set min_uV and uV_step in the regulator descriptor 1870 * and then use this function as their list_voltage() operation, 1871 */ 1872int regulator_list_voltage_linear(struct regulator_dev *rdev, 1873 unsigned int selector) 1874{ 1875 if (selector >= rdev->desc->n_voltages) 1876 return -EINVAL; 1877 1878 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1879} 1880EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1881 1882/** 1883 * regulator_list_voltage - enumerate supported voltages 1884 * @regulator: regulator source 1885 * @selector: identify voltage to list 1886 * Context: can sleep 1887 * 1888 * Returns a voltage that can be passed to @regulator_set_voltage(), 1889 * zero if this selector code can't be used on this system, or a 1890 * negative errno. 1891 */ 1892int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1893{ 1894 struct regulator_dev *rdev = regulator->rdev; 1895 struct regulator_ops *ops = rdev->desc->ops; 1896 int ret; 1897 1898 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1899 return -EINVAL; 1900 1901 mutex_lock(&rdev->mutex); 1902 ret = ops->list_voltage(rdev, selector); 1903 mutex_unlock(&rdev->mutex); 1904 1905 if (ret > 0) { 1906 if (ret < rdev->constraints->min_uV) 1907 ret = 0; 1908 else if (ret > rdev->constraints->max_uV) 1909 ret = 0; 1910 } 1911 1912 return ret; 1913} 1914EXPORT_SYMBOL_GPL(regulator_list_voltage); 1915 1916/** 1917 * regulator_is_supported_voltage - check if a voltage range can be supported 1918 * 1919 * @regulator: Regulator to check. 1920 * @min_uV: Minimum required voltage in uV. 1921 * @max_uV: Maximum required voltage in uV. 1922 * 1923 * Returns a boolean or a negative error code. 1924 */ 1925int regulator_is_supported_voltage(struct regulator *regulator, 1926 int min_uV, int max_uV) 1927{ 1928 int i, voltages, ret; 1929 1930 ret = regulator_count_voltages(regulator); 1931 if (ret < 0) 1932 return ret; 1933 voltages = ret; 1934 1935 for (i = 0; i < voltages; i++) { 1936 ret = regulator_list_voltage(regulator, i); 1937 1938 if (ret >= min_uV && ret <= max_uV) 1939 return 1; 1940 } 1941 1942 return 0; 1943} 1944EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1945 1946/** 1947 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1948 * 1949 * @rdev: regulator to operate on 1950 * 1951 * Regulators that use regmap for their register I/O can set the 1952 * vsel_reg and vsel_mask fields in their descriptor and then use this 1953 * as their get_voltage_vsel operation, saving some code. 1954 */ 1955int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1956{ 1957 unsigned int val; 1958 int ret; 1959 1960 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1961 if (ret != 0) 1962 return ret; 1963 1964 val &= rdev->desc->vsel_mask; 1965 val >>= ffs(rdev->desc->vsel_mask) - 1; 1966 1967 return val; 1968} 1969EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1970 1971/** 1972 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1973 * 1974 * @rdev: regulator to operate on 1975 * @sel: Selector to set 1976 * 1977 * Regulators that use regmap for their register I/O can set the 1978 * vsel_reg and vsel_mask fields in their descriptor and then use this 1979 * as their set_voltage_vsel operation, saving some code. 1980 */ 1981int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 1982{ 1983 sel <<= ffs(rdev->desc->vsel_mask) - 1; 1984 1985 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 1986 rdev->desc->vsel_mask, sel); 1987} 1988EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 1989 1990/** 1991 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 1992 * 1993 * @rdev: Regulator to operate on 1994 * @min_uV: Lower bound for voltage 1995 * @max_uV: Upper bound for voltage 1996 * 1997 * Drivers implementing set_voltage_sel() and list_voltage() can use 1998 * this as their map_voltage() operation. It will find a suitable 1999 * voltage by calling list_voltage() until it gets something in bounds 2000 * for the requested voltages. 2001 */ 2002int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2003 int min_uV, int max_uV) 2004{ 2005 int best_val = INT_MAX; 2006 int selector = 0; 2007 int i, ret; 2008 2009 /* Find the smallest voltage that falls within the specified 2010 * range. 2011 */ 2012 for (i = 0; i < rdev->desc->n_voltages; i++) { 2013 ret = rdev->desc->ops->list_voltage(rdev, i); 2014 if (ret < 0) 2015 continue; 2016 2017 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2018 best_val = ret; 2019 selector = i; 2020 } 2021 } 2022 2023 if (best_val != INT_MAX) 2024 return selector; 2025 else 2026 return -EINVAL; 2027} 2028EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2029 2030/** 2031 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2032 * 2033 * @rdev: Regulator to operate on 2034 * @min_uV: Lower bound for voltage 2035 * @max_uV: Upper bound for voltage 2036 * 2037 * Drivers providing min_uV and uV_step in their regulator_desc can 2038 * use this as their map_voltage() operation. 2039 */ 2040int regulator_map_voltage_linear(struct regulator_dev *rdev, 2041 int min_uV, int max_uV) 2042{ 2043 int ret, voltage; 2044 2045 if (!rdev->desc->uV_step) { 2046 BUG_ON(!rdev->desc->uV_step); 2047 return -EINVAL; 2048 } 2049 2050 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2051 if (ret < 0) 2052 return ret; 2053 2054 /* Map back into a voltage to verify we're still in bounds */ 2055 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2056 if (voltage < min_uV || voltage > max_uV) 2057 return -EINVAL; 2058 2059 return ret; 2060} 2061EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2062 2063static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2064 int min_uV, int max_uV) 2065{ 2066 int ret; 2067 int delay = 0; 2068 int best_val; 2069 unsigned int selector; 2070 int old_selector = -1; 2071 2072 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2073 2074 min_uV += rdev->constraints->uV_offset; 2075 max_uV += rdev->constraints->uV_offset; 2076 2077 /* 2078 * If we can't obtain the old selector there is not enough 2079 * info to call set_voltage_time_sel(). 2080 */ 2081 if (rdev->desc->ops->set_voltage_time_sel && 2082 rdev->desc->ops->get_voltage_sel) { 2083 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2084 if (old_selector < 0) 2085 return old_selector; 2086 } 2087 2088 if (rdev->desc->ops->set_voltage) { 2089 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2090 &selector); 2091 } else if (rdev->desc->ops->set_voltage_sel) { 2092 if (rdev->desc->ops->map_voltage) 2093 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2094 max_uV); 2095 else 2096 ret = regulator_map_voltage_iterate(rdev, min_uV, 2097 max_uV); 2098 2099 if (ret >= 0) { 2100 selector = ret; 2101 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2102 } 2103 } else { 2104 ret = -EINVAL; 2105 } 2106 2107 if (rdev->desc->ops->list_voltage) 2108 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2109 else 2110 best_val = -1; 2111 2112 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2113 if (ret == 0 && old_selector >= 0 && 2114 rdev->desc->ops->set_voltage_time_sel) { 2115 2116 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2117 old_selector, selector); 2118 if (delay < 0) { 2119 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2120 delay); 2121 delay = 0; 2122 } 2123 } 2124 2125 /* Insert any necessary delays */ 2126 if (delay >= 1000) { 2127 mdelay(delay / 1000); 2128 udelay(delay % 1000); 2129 } else if (delay) { 2130 udelay(delay); 2131 } 2132 2133 if (ret == 0) 2134 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2135 NULL); 2136 2137 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2138 2139 return ret; 2140} 2141 2142/** 2143 * regulator_set_voltage - set regulator output voltage 2144 * @regulator: regulator source 2145 * @min_uV: Minimum required voltage in uV 2146 * @max_uV: Maximum acceptable voltage in uV 2147 * 2148 * Sets a voltage regulator to the desired output voltage. This can be set 2149 * during any regulator state. IOW, regulator can be disabled or enabled. 2150 * 2151 * If the regulator is enabled then the voltage will change to the new value 2152 * immediately otherwise if the regulator is disabled the regulator will 2153 * output at the new voltage when enabled. 2154 * 2155 * NOTE: If the regulator is shared between several devices then the lowest 2156 * request voltage that meets the system constraints will be used. 2157 * Regulator system constraints must be set for this regulator before 2158 * calling this function otherwise this call will fail. 2159 */ 2160int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2161{ 2162 struct regulator_dev *rdev = regulator->rdev; 2163 int ret = 0; 2164 2165 mutex_lock(&rdev->mutex); 2166 2167 /* If we're setting the same range as last time the change 2168 * should be a noop (some cpufreq implementations use the same 2169 * voltage for multiple frequencies, for example). 2170 */ 2171 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2172 goto out; 2173 2174 /* sanity check */ 2175 if (!rdev->desc->ops->set_voltage && 2176 !rdev->desc->ops->set_voltage_sel) { 2177 ret = -EINVAL; 2178 goto out; 2179 } 2180 2181 /* constraints check */ 2182 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2183 if (ret < 0) 2184 goto out; 2185 regulator->min_uV = min_uV; 2186 regulator->max_uV = max_uV; 2187 2188 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2189 if (ret < 0) 2190 goto out; 2191 2192 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2193 2194out: 2195 mutex_unlock(&rdev->mutex); 2196 return ret; 2197} 2198EXPORT_SYMBOL_GPL(regulator_set_voltage); 2199 2200/** 2201 * regulator_set_voltage_time - get raise/fall time 2202 * @regulator: regulator source 2203 * @old_uV: starting voltage in microvolts 2204 * @new_uV: target voltage in microvolts 2205 * 2206 * Provided with the starting and ending voltage, this function attempts to 2207 * calculate the time in microseconds required to rise or fall to this new 2208 * voltage. 2209 */ 2210int regulator_set_voltage_time(struct regulator *regulator, 2211 int old_uV, int new_uV) 2212{ 2213 struct regulator_dev *rdev = regulator->rdev; 2214 struct regulator_ops *ops = rdev->desc->ops; 2215 int old_sel = -1; 2216 int new_sel = -1; 2217 int voltage; 2218 int i; 2219 2220 /* Currently requires operations to do this */ 2221 if (!ops->list_voltage || !ops->set_voltage_time_sel 2222 || !rdev->desc->n_voltages) 2223 return -EINVAL; 2224 2225 for (i = 0; i < rdev->desc->n_voltages; i++) { 2226 /* We only look for exact voltage matches here */ 2227 voltage = regulator_list_voltage(regulator, i); 2228 if (voltage < 0) 2229 return -EINVAL; 2230 if (voltage == 0) 2231 continue; 2232 if (voltage == old_uV) 2233 old_sel = i; 2234 if (voltage == new_uV) 2235 new_sel = i; 2236 } 2237 2238 if (old_sel < 0 || new_sel < 0) 2239 return -EINVAL; 2240 2241 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2242} 2243EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2244 2245/** 2246 * regulator_sync_voltage - re-apply last regulator output voltage 2247 * @regulator: regulator source 2248 * 2249 * Re-apply the last configured voltage. This is intended to be used 2250 * where some external control source the consumer is cooperating with 2251 * has caused the configured voltage to change. 2252 */ 2253int regulator_sync_voltage(struct regulator *regulator) 2254{ 2255 struct regulator_dev *rdev = regulator->rdev; 2256 int ret, min_uV, max_uV; 2257 2258 mutex_lock(&rdev->mutex); 2259 2260 if (!rdev->desc->ops->set_voltage && 2261 !rdev->desc->ops->set_voltage_sel) { 2262 ret = -EINVAL; 2263 goto out; 2264 } 2265 2266 /* This is only going to work if we've had a voltage configured. */ 2267 if (!regulator->min_uV && !regulator->max_uV) { 2268 ret = -EINVAL; 2269 goto out; 2270 } 2271 2272 min_uV = regulator->min_uV; 2273 max_uV = regulator->max_uV; 2274 2275 /* This should be a paranoia check... */ 2276 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2277 if (ret < 0) 2278 goto out; 2279 2280 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2281 if (ret < 0) 2282 goto out; 2283 2284 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2285 2286out: 2287 mutex_unlock(&rdev->mutex); 2288 return ret; 2289} 2290EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2291 2292static int _regulator_get_voltage(struct regulator_dev *rdev) 2293{ 2294 int sel, ret; 2295 2296 if (rdev->desc->ops->get_voltage_sel) { 2297 sel = rdev->desc->ops->get_voltage_sel(rdev); 2298 if (sel < 0) 2299 return sel; 2300 ret = rdev->desc->ops->list_voltage(rdev, sel); 2301 } else if (rdev->desc->ops->get_voltage) { 2302 ret = rdev->desc->ops->get_voltage(rdev); 2303 } else { 2304 return -EINVAL; 2305 } 2306 2307 if (ret < 0) 2308 return ret; 2309 return ret - rdev->constraints->uV_offset; 2310} 2311 2312/** 2313 * regulator_get_voltage - get regulator output voltage 2314 * @regulator: regulator source 2315 * 2316 * This returns the current regulator voltage in uV. 2317 * 2318 * NOTE: If the regulator is disabled it will return the voltage value. This 2319 * function should not be used to determine regulator state. 2320 */ 2321int regulator_get_voltage(struct regulator *regulator) 2322{ 2323 int ret; 2324 2325 mutex_lock(®ulator->rdev->mutex); 2326 2327 ret = _regulator_get_voltage(regulator->rdev); 2328 2329 mutex_unlock(®ulator->rdev->mutex); 2330 2331 return ret; 2332} 2333EXPORT_SYMBOL_GPL(regulator_get_voltage); 2334 2335/** 2336 * regulator_set_current_limit - set regulator output current limit 2337 * @regulator: regulator source 2338 * @min_uA: Minimuum supported current in uA 2339 * @max_uA: Maximum supported current in uA 2340 * 2341 * Sets current sink to the desired output current. This can be set during 2342 * any regulator state. IOW, regulator can be disabled or enabled. 2343 * 2344 * If the regulator is enabled then the current will change to the new value 2345 * immediately otherwise if the regulator is disabled the regulator will 2346 * output at the new current when enabled. 2347 * 2348 * NOTE: Regulator system constraints must be set for this regulator before 2349 * calling this function otherwise this call will fail. 2350 */ 2351int regulator_set_current_limit(struct regulator *regulator, 2352 int min_uA, int max_uA) 2353{ 2354 struct regulator_dev *rdev = regulator->rdev; 2355 int ret; 2356 2357 mutex_lock(&rdev->mutex); 2358 2359 /* sanity check */ 2360 if (!rdev->desc->ops->set_current_limit) { 2361 ret = -EINVAL; 2362 goto out; 2363 } 2364 2365 /* constraints check */ 2366 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2367 if (ret < 0) 2368 goto out; 2369 2370 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2371out: 2372 mutex_unlock(&rdev->mutex); 2373 return ret; 2374} 2375EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2376 2377static int _regulator_get_current_limit(struct regulator_dev *rdev) 2378{ 2379 int ret; 2380 2381 mutex_lock(&rdev->mutex); 2382 2383 /* sanity check */ 2384 if (!rdev->desc->ops->get_current_limit) { 2385 ret = -EINVAL; 2386 goto out; 2387 } 2388 2389 ret = rdev->desc->ops->get_current_limit(rdev); 2390out: 2391 mutex_unlock(&rdev->mutex); 2392 return ret; 2393} 2394 2395/** 2396 * regulator_get_current_limit - get regulator output current 2397 * @regulator: regulator source 2398 * 2399 * This returns the current supplied by the specified current sink in uA. 2400 * 2401 * NOTE: If the regulator is disabled it will return the current value. This 2402 * function should not be used to determine regulator state. 2403 */ 2404int regulator_get_current_limit(struct regulator *regulator) 2405{ 2406 return _regulator_get_current_limit(regulator->rdev); 2407} 2408EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2409 2410/** 2411 * regulator_set_mode - set regulator operating mode 2412 * @regulator: regulator source 2413 * @mode: operating mode - one of the REGULATOR_MODE constants 2414 * 2415 * Set regulator operating mode to increase regulator efficiency or improve 2416 * regulation performance. 2417 * 2418 * NOTE: Regulator system constraints must be set for this regulator before 2419 * calling this function otherwise this call will fail. 2420 */ 2421int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2422{ 2423 struct regulator_dev *rdev = regulator->rdev; 2424 int ret; 2425 int regulator_curr_mode; 2426 2427 mutex_lock(&rdev->mutex); 2428 2429 /* sanity check */ 2430 if (!rdev->desc->ops->set_mode) { 2431 ret = -EINVAL; 2432 goto out; 2433 } 2434 2435 /* return if the same mode is requested */ 2436 if (rdev->desc->ops->get_mode) { 2437 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2438 if (regulator_curr_mode == mode) { 2439 ret = 0; 2440 goto out; 2441 } 2442 } 2443 2444 /* constraints check */ 2445 ret = regulator_mode_constrain(rdev, &mode); 2446 if (ret < 0) 2447 goto out; 2448 2449 ret = rdev->desc->ops->set_mode(rdev, mode); 2450out: 2451 mutex_unlock(&rdev->mutex); 2452 return ret; 2453} 2454EXPORT_SYMBOL_GPL(regulator_set_mode); 2455 2456static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2457{ 2458 int ret; 2459 2460 mutex_lock(&rdev->mutex); 2461 2462 /* sanity check */ 2463 if (!rdev->desc->ops->get_mode) { 2464 ret = -EINVAL; 2465 goto out; 2466 } 2467 2468 ret = rdev->desc->ops->get_mode(rdev); 2469out: 2470 mutex_unlock(&rdev->mutex); 2471 return ret; 2472} 2473 2474/** 2475 * regulator_get_mode - get regulator operating mode 2476 * @regulator: regulator source 2477 * 2478 * Get the current regulator operating mode. 2479 */ 2480unsigned int regulator_get_mode(struct regulator *regulator) 2481{ 2482 return _regulator_get_mode(regulator->rdev); 2483} 2484EXPORT_SYMBOL_GPL(regulator_get_mode); 2485 2486/** 2487 * regulator_set_optimum_mode - set regulator optimum operating mode 2488 * @regulator: regulator source 2489 * @uA_load: load current 2490 * 2491 * Notifies the regulator core of a new device load. This is then used by 2492 * DRMS (if enabled by constraints) to set the most efficient regulator 2493 * operating mode for the new regulator loading. 2494 * 2495 * Consumer devices notify their supply regulator of the maximum power 2496 * they will require (can be taken from device datasheet in the power 2497 * consumption tables) when they change operational status and hence power 2498 * state. Examples of operational state changes that can affect power 2499 * consumption are :- 2500 * 2501 * o Device is opened / closed. 2502 * o Device I/O is about to begin or has just finished. 2503 * o Device is idling in between work. 2504 * 2505 * This information is also exported via sysfs to userspace. 2506 * 2507 * DRMS will sum the total requested load on the regulator and change 2508 * to the most efficient operating mode if platform constraints allow. 2509 * 2510 * Returns the new regulator mode or error. 2511 */ 2512int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2513{ 2514 struct regulator_dev *rdev = regulator->rdev; 2515 struct regulator *consumer; 2516 int ret, output_uV, input_uV, total_uA_load = 0; 2517 unsigned int mode; 2518 2519 mutex_lock(&rdev->mutex); 2520 2521 /* 2522 * first check to see if we can set modes at all, otherwise just 2523 * tell the consumer everything is OK. 2524 */ 2525 regulator->uA_load = uA_load; 2526 ret = regulator_check_drms(rdev); 2527 if (ret < 0) { 2528 ret = 0; 2529 goto out; 2530 } 2531 2532 if (!rdev->desc->ops->get_optimum_mode) 2533 goto out; 2534 2535 /* 2536 * we can actually do this so any errors are indicators of 2537 * potential real failure. 2538 */ 2539 ret = -EINVAL; 2540 2541 if (!rdev->desc->ops->set_mode) 2542 goto out; 2543 2544 /* get output voltage */ 2545 output_uV = _regulator_get_voltage(rdev); 2546 if (output_uV <= 0) { 2547 rdev_err(rdev, "invalid output voltage found\n"); 2548 goto out; 2549 } 2550 2551 /* get input voltage */ 2552 input_uV = 0; 2553 if (rdev->supply) 2554 input_uV = regulator_get_voltage(rdev->supply); 2555 if (input_uV <= 0) 2556 input_uV = rdev->constraints->input_uV; 2557 if (input_uV <= 0) { 2558 rdev_err(rdev, "invalid input voltage found\n"); 2559 goto out; 2560 } 2561 2562 /* calc total requested load for this regulator */ 2563 list_for_each_entry(consumer, &rdev->consumer_list, list) 2564 total_uA_load += consumer->uA_load; 2565 2566 mode = rdev->desc->ops->get_optimum_mode(rdev, 2567 input_uV, output_uV, 2568 total_uA_load); 2569 ret = regulator_mode_constrain(rdev, &mode); 2570 if (ret < 0) { 2571 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2572 total_uA_load, input_uV, output_uV); 2573 goto out; 2574 } 2575 2576 ret = rdev->desc->ops->set_mode(rdev, mode); 2577 if (ret < 0) { 2578 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2579 goto out; 2580 } 2581 ret = mode; 2582out: 2583 mutex_unlock(&rdev->mutex); 2584 return ret; 2585} 2586EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2587 2588/** 2589 * regulator_register_notifier - register regulator event notifier 2590 * @regulator: regulator source 2591 * @nb: notifier block 2592 * 2593 * Register notifier block to receive regulator events. 2594 */ 2595int regulator_register_notifier(struct regulator *regulator, 2596 struct notifier_block *nb) 2597{ 2598 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2599 nb); 2600} 2601EXPORT_SYMBOL_GPL(regulator_register_notifier); 2602 2603/** 2604 * regulator_unregister_notifier - unregister regulator event notifier 2605 * @regulator: regulator source 2606 * @nb: notifier block 2607 * 2608 * Unregister regulator event notifier block. 2609 */ 2610int regulator_unregister_notifier(struct regulator *regulator, 2611 struct notifier_block *nb) 2612{ 2613 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2614 nb); 2615} 2616EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2617 2618/* notify regulator consumers and downstream regulator consumers. 2619 * Note mutex must be held by caller. 2620 */ 2621static void _notifier_call_chain(struct regulator_dev *rdev, 2622 unsigned long event, void *data) 2623{ 2624 /* call rdev chain first */ 2625 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2626} 2627 2628/** 2629 * regulator_bulk_get - get multiple regulator consumers 2630 * 2631 * @dev: Device to supply 2632 * @num_consumers: Number of consumers to register 2633 * @consumers: Configuration of consumers; clients are stored here. 2634 * 2635 * @return 0 on success, an errno on failure. 2636 * 2637 * This helper function allows drivers to get several regulator 2638 * consumers in one operation. If any of the regulators cannot be 2639 * acquired then any regulators that were allocated will be freed 2640 * before returning to the caller. 2641 */ 2642int regulator_bulk_get(struct device *dev, int num_consumers, 2643 struct regulator_bulk_data *consumers) 2644{ 2645 int i; 2646 int ret; 2647 2648 for (i = 0; i < num_consumers; i++) 2649 consumers[i].consumer = NULL; 2650 2651 for (i = 0; i < num_consumers; i++) { 2652 consumers[i].consumer = regulator_get(dev, 2653 consumers[i].supply); 2654 if (IS_ERR(consumers[i].consumer)) { 2655 ret = PTR_ERR(consumers[i].consumer); 2656 dev_err(dev, "Failed to get supply '%s': %d\n", 2657 consumers[i].supply, ret); 2658 consumers[i].consumer = NULL; 2659 goto err; 2660 } 2661 } 2662 2663 return 0; 2664 2665err: 2666 while (--i >= 0) 2667 regulator_put(consumers[i].consumer); 2668 2669 return ret; 2670} 2671EXPORT_SYMBOL_GPL(regulator_bulk_get); 2672 2673/** 2674 * devm_regulator_bulk_get - managed get multiple regulator consumers 2675 * 2676 * @dev: Device to supply 2677 * @num_consumers: Number of consumers to register 2678 * @consumers: Configuration of consumers; clients are stored here. 2679 * 2680 * @return 0 on success, an errno on failure. 2681 * 2682 * This helper function allows drivers to get several regulator 2683 * consumers in one operation with management, the regulators will 2684 * automatically be freed when the device is unbound. If any of the 2685 * regulators cannot be acquired then any regulators that were 2686 * allocated will be freed before returning to the caller. 2687 */ 2688int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2689 struct regulator_bulk_data *consumers) 2690{ 2691 int i; 2692 int ret; 2693 2694 for (i = 0; i < num_consumers; i++) 2695 consumers[i].consumer = NULL; 2696 2697 for (i = 0; i < num_consumers; i++) { 2698 consumers[i].consumer = devm_regulator_get(dev, 2699 consumers[i].supply); 2700 if (IS_ERR(consumers[i].consumer)) { 2701 ret = PTR_ERR(consumers[i].consumer); 2702 dev_err(dev, "Failed to get supply '%s': %d\n", 2703 consumers[i].supply, ret); 2704 consumers[i].consumer = NULL; 2705 goto err; 2706 } 2707 } 2708 2709 return 0; 2710 2711err: 2712 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2713 devm_regulator_put(consumers[i].consumer); 2714 2715 return ret; 2716} 2717EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2718 2719static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2720{ 2721 struct regulator_bulk_data *bulk = data; 2722 2723 bulk->ret = regulator_enable(bulk->consumer); 2724} 2725 2726/** 2727 * regulator_bulk_enable - enable multiple regulator consumers 2728 * 2729 * @num_consumers: Number of consumers 2730 * @consumers: Consumer data; clients are stored here. 2731 * @return 0 on success, an errno on failure 2732 * 2733 * This convenience API allows consumers to enable multiple regulator 2734 * clients in a single API call. If any consumers cannot be enabled 2735 * then any others that were enabled will be disabled again prior to 2736 * return. 2737 */ 2738int regulator_bulk_enable(int num_consumers, 2739 struct regulator_bulk_data *consumers) 2740{ 2741 LIST_HEAD(async_domain); 2742 int i; 2743 int ret = 0; 2744 2745 for (i = 0; i < num_consumers; i++) { 2746 if (consumers[i].consumer->always_on) 2747 consumers[i].ret = 0; 2748 else 2749 async_schedule_domain(regulator_bulk_enable_async, 2750 &consumers[i], &async_domain); 2751 } 2752 2753 async_synchronize_full_domain(&async_domain); 2754 2755 /* If any consumer failed we need to unwind any that succeeded */ 2756 for (i = 0; i < num_consumers; i++) { 2757 if (consumers[i].ret != 0) { 2758 ret = consumers[i].ret; 2759 goto err; 2760 } 2761 } 2762 2763 return 0; 2764 2765err: 2766 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2767 while (--i >= 0) 2768 regulator_disable(consumers[i].consumer); 2769 2770 return ret; 2771} 2772EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2773 2774/** 2775 * regulator_bulk_disable - disable multiple regulator consumers 2776 * 2777 * @num_consumers: Number of consumers 2778 * @consumers: Consumer data; clients are stored here. 2779 * @return 0 on success, an errno on failure 2780 * 2781 * This convenience API allows consumers to disable multiple regulator 2782 * clients in a single API call. If any consumers cannot be disabled 2783 * then any others that were disabled will be enabled again prior to 2784 * return. 2785 */ 2786int regulator_bulk_disable(int num_consumers, 2787 struct regulator_bulk_data *consumers) 2788{ 2789 int i; 2790 int ret, r; 2791 2792 for (i = num_consumers - 1; i >= 0; --i) { 2793 ret = regulator_disable(consumers[i].consumer); 2794 if (ret != 0) 2795 goto err; 2796 } 2797 2798 return 0; 2799 2800err: 2801 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2802 for (++i; i < num_consumers; ++i) { 2803 r = regulator_enable(consumers[i].consumer); 2804 if (r != 0) 2805 pr_err("Failed to reename %s: %d\n", 2806 consumers[i].supply, r); 2807 } 2808 2809 return ret; 2810} 2811EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2812 2813/** 2814 * regulator_bulk_force_disable - force disable multiple regulator consumers 2815 * 2816 * @num_consumers: Number of consumers 2817 * @consumers: Consumer data; clients are stored here. 2818 * @return 0 on success, an errno on failure 2819 * 2820 * This convenience API allows consumers to forcibly disable multiple regulator 2821 * clients in a single API call. 2822 * NOTE: This should be used for situations when device damage will 2823 * likely occur if the regulators are not disabled (e.g. over temp). 2824 * Although regulator_force_disable function call for some consumers can 2825 * return error numbers, the function is called for all consumers. 2826 */ 2827int regulator_bulk_force_disable(int num_consumers, 2828 struct regulator_bulk_data *consumers) 2829{ 2830 int i; 2831 int ret; 2832 2833 for (i = 0; i < num_consumers; i++) 2834 consumers[i].ret = 2835 regulator_force_disable(consumers[i].consumer); 2836 2837 for (i = 0; i < num_consumers; i++) { 2838 if (consumers[i].ret != 0) { 2839 ret = consumers[i].ret; 2840 goto out; 2841 } 2842 } 2843 2844 return 0; 2845out: 2846 return ret; 2847} 2848EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2849 2850/** 2851 * regulator_bulk_free - free multiple regulator consumers 2852 * 2853 * @num_consumers: Number of consumers 2854 * @consumers: Consumer data; clients are stored here. 2855 * 2856 * This convenience API allows consumers to free multiple regulator 2857 * clients in a single API call. 2858 */ 2859void regulator_bulk_free(int num_consumers, 2860 struct regulator_bulk_data *consumers) 2861{ 2862 int i; 2863 2864 for (i = 0; i < num_consumers; i++) { 2865 regulator_put(consumers[i].consumer); 2866 consumers[i].consumer = NULL; 2867 } 2868} 2869EXPORT_SYMBOL_GPL(regulator_bulk_free); 2870 2871/** 2872 * regulator_notifier_call_chain - call regulator event notifier 2873 * @rdev: regulator source 2874 * @event: notifier block 2875 * @data: callback-specific data. 2876 * 2877 * Called by regulator drivers to notify clients a regulator event has 2878 * occurred. We also notify regulator clients downstream. 2879 * Note lock must be held by caller. 2880 */ 2881int regulator_notifier_call_chain(struct regulator_dev *rdev, 2882 unsigned long event, void *data) 2883{ 2884 _notifier_call_chain(rdev, event, data); 2885 return NOTIFY_DONE; 2886 2887} 2888EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2889 2890/** 2891 * regulator_mode_to_status - convert a regulator mode into a status 2892 * 2893 * @mode: Mode to convert 2894 * 2895 * Convert a regulator mode into a status. 2896 */ 2897int regulator_mode_to_status(unsigned int mode) 2898{ 2899 switch (mode) { 2900 case REGULATOR_MODE_FAST: 2901 return REGULATOR_STATUS_FAST; 2902 case REGULATOR_MODE_NORMAL: 2903 return REGULATOR_STATUS_NORMAL; 2904 case REGULATOR_MODE_IDLE: 2905 return REGULATOR_STATUS_IDLE; 2906 case REGULATOR_STATUS_STANDBY: 2907 return REGULATOR_STATUS_STANDBY; 2908 default: 2909 return 0; 2910 } 2911} 2912EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2913 2914/* 2915 * To avoid cluttering sysfs (and memory) with useless state, only 2916 * create attributes that can be meaningfully displayed. 2917 */ 2918static int add_regulator_attributes(struct regulator_dev *rdev) 2919{ 2920 struct device *dev = &rdev->dev; 2921 struct regulator_ops *ops = rdev->desc->ops; 2922 int status = 0; 2923 2924 /* some attributes need specific methods to be displayed */ 2925 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2926 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2927 status = device_create_file(dev, &dev_attr_microvolts); 2928 if (status < 0) 2929 return status; 2930 } 2931 if (ops->get_current_limit) { 2932 status = device_create_file(dev, &dev_attr_microamps); 2933 if (status < 0) 2934 return status; 2935 } 2936 if (ops->get_mode) { 2937 status = device_create_file(dev, &dev_attr_opmode); 2938 if (status < 0) 2939 return status; 2940 } 2941 if (ops->is_enabled) { 2942 status = device_create_file(dev, &dev_attr_state); 2943 if (status < 0) 2944 return status; 2945 } 2946 if (ops->get_status) { 2947 status = device_create_file(dev, &dev_attr_status); 2948 if (status < 0) 2949 return status; 2950 } 2951 2952 /* some attributes are type-specific */ 2953 if (rdev->desc->type == REGULATOR_CURRENT) { 2954 status = device_create_file(dev, &dev_attr_requested_microamps); 2955 if (status < 0) 2956 return status; 2957 } 2958 2959 /* all the other attributes exist to support constraints; 2960 * don't show them if there are no constraints, or if the 2961 * relevant supporting methods are missing. 2962 */ 2963 if (!rdev->constraints) 2964 return status; 2965 2966 /* constraints need specific supporting methods */ 2967 if (ops->set_voltage || ops->set_voltage_sel) { 2968 status = device_create_file(dev, &dev_attr_min_microvolts); 2969 if (status < 0) 2970 return status; 2971 status = device_create_file(dev, &dev_attr_max_microvolts); 2972 if (status < 0) 2973 return status; 2974 } 2975 if (ops->set_current_limit) { 2976 status = device_create_file(dev, &dev_attr_min_microamps); 2977 if (status < 0) 2978 return status; 2979 status = device_create_file(dev, &dev_attr_max_microamps); 2980 if (status < 0) 2981 return status; 2982 } 2983 2984 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2985 if (status < 0) 2986 return status; 2987 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2988 if (status < 0) 2989 return status; 2990 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2991 if (status < 0) 2992 return status; 2993 2994 if (ops->set_suspend_voltage) { 2995 status = device_create_file(dev, 2996 &dev_attr_suspend_standby_microvolts); 2997 if (status < 0) 2998 return status; 2999 status = device_create_file(dev, 3000 &dev_attr_suspend_mem_microvolts); 3001 if (status < 0) 3002 return status; 3003 status = device_create_file(dev, 3004 &dev_attr_suspend_disk_microvolts); 3005 if (status < 0) 3006 return status; 3007 } 3008 3009 if (ops->set_suspend_mode) { 3010 status = device_create_file(dev, 3011 &dev_attr_suspend_standby_mode); 3012 if (status < 0) 3013 return status; 3014 status = device_create_file(dev, 3015 &dev_attr_suspend_mem_mode); 3016 if (status < 0) 3017 return status; 3018 status = device_create_file(dev, 3019 &dev_attr_suspend_disk_mode); 3020 if (status < 0) 3021 return status; 3022 } 3023 3024 return status; 3025} 3026 3027static void rdev_init_debugfs(struct regulator_dev *rdev) 3028{ 3029 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3030 if (!rdev->debugfs) { 3031 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3032 return; 3033 } 3034 3035 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3036 &rdev->use_count); 3037 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3038 &rdev->open_count); 3039} 3040 3041/** 3042 * regulator_register - register regulator 3043 * @regulator_desc: regulator to register 3044 * @config: runtime configuration for regulator 3045 * 3046 * Called by regulator drivers to register a regulator. 3047 * Returns 0 on success. 3048 */ 3049struct regulator_dev * 3050regulator_register(const struct regulator_desc *regulator_desc, 3051 const struct regulator_config *config) 3052{ 3053 const struct regulation_constraints *constraints = NULL; 3054 const struct regulator_init_data *init_data; 3055 static atomic_t regulator_no = ATOMIC_INIT(0); 3056 struct regulator_dev *rdev; 3057 struct device *dev; 3058 int ret, i; 3059 const char *supply = NULL; 3060 3061 if (regulator_desc == NULL || config == NULL) 3062 return ERR_PTR(-EINVAL); 3063 3064 dev = config->dev; 3065 WARN_ON(!dev); 3066 3067 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3068 return ERR_PTR(-EINVAL); 3069 3070 if (regulator_desc->type != REGULATOR_VOLTAGE && 3071 regulator_desc->type != REGULATOR_CURRENT) 3072 return ERR_PTR(-EINVAL); 3073 3074 /* Only one of each should be implemented */ 3075 WARN_ON(regulator_desc->ops->get_voltage && 3076 regulator_desc->ops->get_voltage_sel); 3077 WARN_ON(regulator_desc->ops->set_voltage && 3078 regulator_desc->ops->set_voltage_sel); 3079 3080 /* If we're using selectors we must implement list_voltage. */ 3081 if (regulator_desc->ops->get_voltage_sel && 3082 !regulator_desc->ops->list_voltage) { 3083 return ERR_PTR(-EINVAL); 3084 } 3085 if (regulator_desc->ops->set_voltage_sel && 3086 !regulator_desc->ops->list_voltage) { 3087 return ERR_PTR(-EINVAL); 3088 } 3089 3090 init_data = config->init_data; 3091 3092 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3093 if (rdev == NULL) 3094 return ERR_PTR(-ENOMEM); 3095 3096 mutex_lock(®ulator_list_mutex); 3097 3098 mutex_init(&rdev->mutex); 3099 rdev->reg_data = config->driver_data; 3100 rdev->owner = regulator_desc->owner; 3101 rdev->desc = regulator_desc; 3102 rdev->regmap = config->regmap; 3103 INIT_LIST_HEAD(&rdev->consumer_list); 3104 INIT_LIST_HEAD(&rdev->list); 3105 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3106 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3107 3108 /* preform any regulator specific init */ 3109 if (init_data && init_data->regulator_init) { 3110 ret = init_data->regulator_init(rdev->reg_data); 3111 if (ret < 0) 3112 goto clean; 3113 } 3114 3115 /* register with sysfs */ 3116 rdev->dev.class = ®ulator_class; 3117 rdev->dev.of_node = config->of_node; 3118 rdev->dev.parent = dev; 3119 dev_set_name(&rdev->dev, "regulator.%d", 3120 atomic_inc_return(®ulator_no) - 1); 3121 ret = device_register(&rdev->dev); 3122 if (ret != 0) { 3123 put_device(&rdev->dev); 3124 goto clean; 3125 } 3126 3127 dev_set_drvdata(&rdev->dev, rdev); 3128 3129 /* set regulator constraints */ 3130 if (init_data) 3131 constraints = &init_data->constraints; 3132 3133 ret = set_machine_constraints(rdev, constraints); 3134 if (ret < 0) 3135 goto scrub; 3136 3137 /* add attributes supported by this regulator */ 3138 ret = add_regulator_attributes(rdev); 3139 if (ret < 0) 3140 goto scrub; 3141 3142 if (init_data && init_data->supply_regulator) 3143 supply = init_data->supply_regulator; 3144 else if (regulator_desc->supply_name) 3145 supply = regulator_desc->supply_name; 3146 3147 if (supply) { 3148 struct regulator_dev *r; 3149 3150 r = regulator_dev_lookup(dev, supply, &ret); 3151 3152 if (!r) { 3153 dev_err(dev, "Failed to find supply %s\n", supply); 3154 ret = -EPROBE_DEFER; 3155 goto scrub; 3156 } 3157 3158 ret = set_supply(rdev, r); 3159 if (ret < 0) 3160 goto scrub; 3161 3162 /* Enable supply if rail is enabled */ 3163 if (rdev->desc->ops->is_enabled && 3164 rdev->desc->ops->is_enabled(rdev)) { 3165 ret = regulator_enable(rdev->supply); 3166 if (ret < 0) 3167 goto scrub; 3168 } 3169 } 3170 3171 /* add consumers devices */ 3172 if (init_data) { 3173 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3174 ret = set_consumer_device_supply(rdev, 3175 init_data->consumer_supplies[i].dev_name, 3176 init_data->consumer_supplies[i].supply); 3177 if (ret < 0) { 3178 dev_err(dev, "Failed to set supply %s\n", 3179 init_data->consumer_supplies[i].supply); 3180 goto unset_supplies; 3181 } 3182 } 3183 } 3184 3185 list_add(&rdev->list, ®ulator_list); 3186 3187 rdev_init_debugfs(rdev); 3188out: 3189 mutex_unlock(®ulator_list_mutex); 3190 return rdev; 3191 3192unset_supplies: 3193 unset_regulator_supplies(rdev); 3194 3195scrub: 3196 kfree(rdev->constraints); 3197 device_unregister(&rdev->dev); 3198 /* device core frees rdev */ 3199 rdev = ERR_PTR(ret); 3200 goto out; 3201 3202clean: 3203 kfree(rdev); 3204 rdev = ERR_PTR(ret); 3205 goto out; 3206} 3207EXPORT_SYMBOL_GPL(regulator_register); 3208 3209/** 3210 * regulator_unregister - unregister regulator 3211 * @rdev: regulator to unregister 3212 * 3213 * Called by regulator drivers to unregister a regulator. 3214 */ 3215void regulator_unregister(struct regulator_dev *rdev) 3216{ 3217 if (rdev == NULL) 3218 return; 3219 3220 if (rdev->supply) 3221 regulator_put(rdev->supply); 3222 mutex_lock(®ulator_list_mutex); 3223 debugfs_remove_recursive(rdev->debugfs); 3224 flush_work_sync(&rdev->disable_work.work); 3225 WARN_ON(rdev->open_count); 3226 unset_regulator_supplies(rdev); 3227 list_del(&rdev->list); 3228 kfree(rdev->constraints); 3229 device_unregister(&rdev->dev); 3230 mutex_unlock(®ulator_list_mutex); 3231} 3232EXPORT_SYMBOL_GPL(regulator_unregister); 3233 3234/** 3235 * regulator_suspend_prepare - prepare regulators for system wide suspend 3236 * @state: system suspend state 3237 * 3238 * Configure each regulator with it's suspend operating parameters for state. 3239 * This will usually be called by machine suspend code prior to supending. 3240 */ 3241int regulator_suspend_prepare(suspend_state_t state) 3242{ 3243 struct regulator_dev *rdev; 3244 int ret = 0; 3245 3246 /* ON is handled by regulator active state */ 3247 if (state == PM_SUSPEND_ON) 3248 return -EINVAL; 3249 3250 mutex_lock(®ulator_list_mutex); 3251 list_for_each_entry(rdev, ®ulator_list, list) { 3252 3253 mutex_lock(&rdev->mutex); 3254 ret = suspend_prepare(rdev, state); 3255 mutex_unlock(&rdev->mutex); 3256 3257 if (ret < 0) { 3258 rdev_err(rdev, "failed to prepare\n"); 3259 goto out; 3260 } 3261 } 3262out: 3263 mutex_unlock(®ulator_list_mutex); 3264 return ret; 3265} 3266EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3267 3268/** 3269 * regulator_suspend_finish - resume regulators from system wide suspend 3270 * 3271 * Turn on regulators that might be turned off by regulator_suspend_prepare 3272 * and that should be turned on according to the regulators properties. 3273 */ 3274int regulator_suspend_finish(void) 3275{ 3276 struct regulator_dev *rdev; 3277 int ret = 0, error; 3278 3279 mutex_lock(®ulator_list_mutex); 3280 list_for_each_entry(rdev, ®ulator_list, list) { 3281 struct regulator_ops *ops = rdev->desc->ops; 3282 3283 mutex_lock(&rdev->mutex); 3284 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3285 ops->enable) { 3286 error = ops->enable(rdev); 3287 if (error) 3288 ret = error; 3289 } else { 3290 if (!has_full_constraints) 3291 goto unlock; 3292 if (!ops->disable) 3293 goto unlock; 3294 if (ops->is_enabled && !ops->is_enabled(rdev)) 3295 goto unlock; 3296 3297 error = ops->disable(rdev); 3298 if (error) 3299 ret = error; 3300 } 3301unlock: 3302 mutex_unlock(&rdev->mutex); 3303 } 3304 mutex_unlock(®ulator_list_mutex); 3305 return ret; 3306} 3307EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3308 3309/** 3310 * regulator_has_full_constraints - the system has fully specified constraints 3311 * 3312 * Calling this function will cause the regulator API to disable all 3313 * regulators which have a zero use count and don't have an always_on 3314 * constraint in a late_initcall. 3315 * 3316 * The intention is that this will become the default behaviour in a 3317 * future kernel release so users are encouraged to use this facility 3318 * now. 3319 */ 3320void regulator_has_full_constraints(void) 3321{ 3322 has_full_constraints = 1; 3323} 3324EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3325 3326/** 3327 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3328 * 3329 * Calling this function will cause the regulator API to provide a 3330 * dummy regulator to consumers if no physical regulator is found, 3331 * allowing most consumers to proceed as though a regulator were 3332 * configured. This allows systems such as those with software 3333 * controllable regulators for the CPU core only to be brought up more 3334 * readily. 3335 */ 3336void regulator_use_dummy_regulator(void) 3337{ 3338 board_wants_dummy_regulator = true; 3339} 3340EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3341 3342/** 3343 * rdev_get_drvdata - get rdev regulator driver data 3344 * @rdev: regulator 3345 * 3346 * Get rdev regulator driver private data. This call can be used in the 3347 * regulator driver context. 3348 */ 3349void *rdev_get_drvdata(struct regulator_dev *rdev) 3350{ 3351 return rdev->reg_data; 3352} 3353EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3354 3355/** 3356 * regulator_get_drvdata - get regulator driver data 3357 * @regulator: regulator 3358 * 3359 * Get regulator driver private data. This call can be used in the consumer 3360 * driver context when non API regulator specific functions need to be called. 3361 */ 3362void *regulator_get_drvdata(struct regulator *regulator) 3363{ 3364 return regulator->rdev->reg_data; 3365} 3366EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3367 3368/** 3369 * regulator_set_drvdata - set regulator driver data 3370 * @regulator: regulator 3371 * @data: data 3372 */ 3373void regulator_set_drvdata(struct regulator *regulator, void *data) 3374{ 3375 regulator->rdev->reg_data = data; 3376} 3377EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3378 3379/** 3380 * regulator_get_id - get regulator ID 3381 * @rdev: regulator 3382 */ 3383int rdev_get_id(struct regulator_dev *rdev) 3384{ 3385 return rdev->desc->id; 3386} 3387EXPORT_SYMBOL_GPL(rdev_get_id); 3388 3389struct device *rdev_get_dev(struct regulator_dev *rdev) 3390{ 3391 return &rdev->dev; 3392} 3393EXPORT_SYMBOL_GPL(rdev_get_dev); 3394 3395void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3396{ 3397 return reg_init_data->driver_data; 3398} 3399EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3400 3401#ifdef CONFIG_DEBUG_FS 3402static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3403 size_t count, loff_t *ppos) 3404{ 3405 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3406 ssize_t len, ret = 0; 3407 struct regulator_map *map; 3408 3409 if (!buf) 3410 return -ENOMEM; 3411 3412 list_for_each_entry(map, ®ulator_map_list, list) { 3413 len = snprintf(buf + ret, PAGE_SIZE - ret, 3414 "%s -> %s.%s\n", 3415 rdev_get_name(map->regulator), map->dev_name, 3416 map->supply); 3417 if (len >= 0) 3418 ret += len; 3419 if (ret > PAGE_SIZE) { 3420 ret = PAGE_SIZE; 3421 break; 3422 } 3423 } 3424 3425 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3426 3427 kfree(buf); 3428 3429 return ret; 3430} 3431#endif 3432 3433static const struct file_operations supply_map_fops = { 3434#ifdef CONFIG_DEBUG_FS 3435 .read = supply_map_read_file, 3436 .llseek = default_llseek, 3437#endif 3438}; 3439 3440static int __init regulator_init(void) 3441{ 3442 int ret; 3443 3444 ret = class_register(®ulator_class); 3445 3446 debugfs_root = debugfs_create_dir("regulator", NULL); 3447 if (!debugfs_root) 3448 pr_warn("regulator: Failed to create debugfs directory\n"); 3449 3450 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3451 &supply_map_fops); 3452 3453 regulator_dummy_init(); 3454 3455 return ret; 3456} 3457 3458/* init early to allow our consumers to complete system booting */ 3459core_initcall(regulator_init); 3460 3461static int __init regulator_init_complete(void) 3462{ 3463 struct regulator_dev *rdev; 3464 struct regulator_ops *ops; 3465 struct regulation_constraints *c; 3466 int enabled, ret; 3467 3468 mutex_lock(®ulator_list_mutex); 3469 3470 /* If we have a full configuration then disable any regulators 3471 * which are not in use or always_on. This will become the 3472 * default behaviour in the future. 3473 */ 3474 list_for_each_entry(rdev, ®ulator_list, list) { 3475 ops = rdev->desc->ops; 3476 c = rdev->constraints; 3477 3478 if (!ops->disable || (c && c->always_on)) 3479 continue; 3480 3481 mutex_lock(&rdev->mutex); 3482 3483 if (rdev->use_count) 3484 goto unlock; 3485 3486 /* If we can't read the status assume it's on. */ 3487 if (ops->is_enabled) 3488 enabled = ops->is_enabled(rdev); 3489 else 3490 enabled = 1; 3491 3492 if (!enabled) 3493 goto unlock; 3494 3495 if (has_full_constraints) { 3496 /* We log since this may kill the system if it 3497 * goes wrong. */ 3498 rdev_info(rdev, "disabling\n"); 3499 ret = ops->disable(rdev); 3500 if (ret != 0) { 3501 rdev_err(rdev, "couldn't disable: %d\n", ret); 3502 } 3503 } else { 3504 /* The intention is that in future we will 3505 * assume that full constraints are provided 3506 * so warn even if we aren't going to do 3507 * anything here. 3508 */ 3509 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3510 } 3511 3512unlock: 3513 mutex_unlock(&rdev->mutex); 3514 } 3515 3516 mutex_unlock(®ulator_list_mutex); 3517 3518 return 0; 3519} 3520late_initcall(regulator_init_complete); 3521