core.c revision a06ccd9c3785fa5550917ae036944f4e080b5749
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39#include "internal.h" 40 41#define rdev_crit(rdev, fmt, ...) \ 42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_err(rdev, fmt, ...) \ 44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_warn(rdev, fmt, ...) \ 46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_info(rdev, fmt, ...) \ 48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49#define rdev_dbg(rdev, fmt, ...) \ 50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 51 52static DEFINE_MUTEX(regulator_list_mutex); 53static LIST_HEAD(regulator_list); 54static LIST_HEAD(regulator_map_list); 55static LIST_HEAD(regulator_ena_gpio_list); 56static LIST_HEAD(regulator_supply_alias_list); 57static bool has_full_constraints; 58static bool board_wants_dummy_regulator; 59 60static struct dentry *debugfs_root; 61 62/* 63 * struct regulator_map 64 * 65 * Used to provide symbolic supply names to devices. 66 */ 67struct regulator_map { 68 struct list_head list; 69 const char *dev_name; /* The dev_name() for the consumer */ 70 const char *supply; 71 struct regulator_dev *regulator; 72}; 73 74/* 75 * struct regulator_enable_gpio 76 * 77 * Management for shared enable GPIO pin 78 */ 79struct regulator_enable_gpio { 80 struct list_head list; 81 int gpio; 82 u32 enable_count; /* a number of enabled shared GPIO */ 83 u32 request_count; /* a number of requested shared GPIO */ 84 unsigned int ena_gpio_invert:1; 85}; 86 87/* 88 * struct regulator_supply_alias 89 * 90 * Used to map lookups for a supply onto an alternative device. 91 */ 92struct regulator_supply_alias { 93 struct list_head list; 94 struct device *src_dev; 95 const char *src_supply; 96 struct device *alias_dev; 97 const char *alias_supply; 98}; 99 100static int _regulator_is_enabled(struct regulator_dev *rdev); 101static int _regulator_disable(struct regulator_dev *rdev); 102static int _regulator_get_voltage(struct regulator_dev *rdev); 103static int _regulator_get_current_limit(struct regulator_dev *rdev); 104static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 105static void _notifier_call_chain(struct regulator_dev *rdev, 106 unsigned long event, void *data); 107static int _regulator_do_set_voltage(struct regulator_dev *rdev, 108 int min_uV, int max_uV); 109static struct regulator *create_regulator(struct regulator_dev *rdev, 110 struct device *dev, 111 const char *supply_name); 112 113static const char *rdev_get_name(struct regulator_dev *rdev) 114{ 115 if (rdev->constraints && rdev->constraints->name) 116 return rdev->constraints->name; 117 else if (rdev->desc->name) 118 return rdev->desc->name; 119 else 120 return ""; 121} 122 123/** 124 * of_get_regulator - get a regulator device node based on supply name 125 * @dev: Device pointer for the consumer (of regulator) device 126 * @supply: regulator supply name 127 * 128 * Extract the regulator device node corresponding to the supply name. 129 * returns the device node corresponding to the regulator if found, else 130 * returns NULL. 131 */ 132static struct device_node *of_get_regulator(struct device *dev, const char *supply) 133{ 134 struct device_node *regnode = NULL; 135 char prop_name[32]; /* 32 is max size of property name */ 136 137 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 138 139 snprintf(prop_name, 32, "%s-supply", supply); 140 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 141 142 if (!regnode) { 143 dev_dbg(dev, "Looking up %s property in node %s failed", 144 prop_name, dev->of_node->full_name); 145 return NULL; 146 } 147 return regnode; 148} 149 150static int _regulator_can_change_status(struct regulator_dev *rdev) 151{ 152 if (!rdev->constraints) 153 return 0; 154 155 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 156 return 1; 157 else 158 return 0; 159} 160 161/* Platform voltage constraint check */ 162static int regulator_check_voltage(struct regulator_dev *rdev, 163 int *min_uV, int *max_uV) 164{ 165 BUG_ON(*min_uV > *max_uV); 166 167 if (!rdev->constraints) { 168 rdev_err(rdev, "no constraints\n"); 169 return -ENODEV; 170 } 171 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 172 rdev_err(rdev, "operation not allowed\n"); 173 return -EPERM; 174 } 175 176 if (*max_uV > rdev->constraints->max_uV) 177 *max_uV = rdev->constraints->max_uV; 178 if (*min_uV < rdev->constraints->min_uV) 179 *min_uV = rdev->constraints->min_uV; 180 181 if (*min_uV > *max_uV) { 182 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 183 *min_uV, *max_uV); 184 return -EINVAL; 185 } 186 187 return 0; 188} 189 190/* Make sure we select a voltage that suits the needs of all 191 * regulator consumers 192 */ 193static int regulator_check_consumers(struct regulator_dev *rdev, 194 int *min_uV, int *max_uV) 195{ 196 struct regulator *regulator; 197 198 list_for_each_entry(regulator, &rdev->consumer_list, list) { 199 /* 200 * Assume consumers that didn't say anything are OK 201 * with anything in the constraint range. 202 */ 203 if (!regulator->min_uV && !regulator->max_uV) 204 continue; 205 206 if (*max_uV > regulator->max_uV) 207 *max_uV = regulator->max_uV; 208 if (*min_uV < regulator->min_uV) 209 *min_uV = regulator->min_uV; 210 } 211 212 if (*min_uV > *max_uV) { 213 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 214 *min_uV, *max_uV); 215 return -EINVAL; 216 } 217 218 return 0; 219} 220 221/* current constraint check */ 222static int regulator_check_current_limit(struct regulator_dev *rdev, 223 int *min_uA, int *max_uA) 224{ 225 BUG_ON(*min_uA > *max_uA); 226 227 if (!rdev->constraints) { 228 rdev_err(rdev, "no constraints\n"); 229 return -ENODEV; 230 } 231 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 232 rdev_err(rdev, "operation not allowed\n"); 233 return -EPERM; 234 } 235 236 if (*max_uA > rdev->constraints->max_uA) 237 *max_uA = rdev->constraints->max_uA; 238 if (*min_uA < rdev->constraints->min_uA) 239 *min_uA = rdev->constraints->min_uA; 240 241 if (*min_uA > *max_uA) { 242 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 243 *min_uA, *max_uA); 244 return -EINVAL; 245 } 246 247 return 0; 248} 249 250/* operating mode constraint check */ 251static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 252{ 253 switch (*mode) { 254 case REGULATOR_MODE_FAST: 255 case REGULATOR_MODE_NORMAL: 256 case REGULATOR_MODE_IDLE: 257 case REGULATOR_MODE_STANDBY: 258 break; 259 default: 260 rdev_err(rdev, "invalid mode %x specified\n", *mode); 261 return -EINVAL; 262 } 263 264 if (!rdev->constraints) { 265 rdev_err(rdev, "no constraints\n"); 266 return -ENODEV; 267 } 268 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 269 rdev_err(rdev, "operation not allowed\n"); 270 return -EPERM; 271 } 272 273 /* The modes are bitmasks, the most power hungry modes having 274 * the lowest values. If the requested mode isn't supported 275 * try higher modes. */ 276 while (*mode) { 277 if (rdev->constraints->valid_modes_mask & *mode) 278 return 0; 279 *mode /= 2; 280 } 281 282 return -EINVAL; 283} 284 285/* dynamic regulator mode switching constraint check */ 286static int regulator_check_drms(struct regulator_dev *rdev) 287{ 288 if (!rdev->constraints) { 289 rdev_err(rdev, "no constraints\n"); 290 return -ENODEV; 291 } 292 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 293 rdev_err(rdev, "operation not allowed\n"); 294 return -EPERM; 295 } 296 return 0; 297} 298 299static ssize_t regulator_uV_show(struct device *dev, 300 struct device_attribute *attr, char *buf) 301{ 302 struct regulator_dev *rdev = dev_get_drvdata(dev); 303 ssize_t ret; 304 305 mutex_lock(&rdev->mutex); 306 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 307 mutex_unlock(&rdev->mutex); 308 309 return ret; 310} 311static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 312 313static ssize_t regulator_uA_show(struct device *dev, 314 struct device_attribute *attr, char *buf) 315{ 316 struct regulator_dev *rdev = dev_get_drvdata(dev); 317 318 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 319} 320static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 321 322static ssize_t name_show(struct device *dev, struct device_attribute *attr, 323 char *buf) 324{ 325 struct regulator_dev *rdev = dev_get_drvdata(dev); 326 327 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 328} 329static DEVICE_ATTR_RO(name); 330 331static ssize_t regulator_print_opmode(char *buf, int mode) 332{ 333 switch (mode) { 334 case REGULATOR_MODE_FAST: 335 return sprintf(buf, "fast\n"); 336 case REGULATOR_MODE_NORMAL: 337 return sprintf(buf, "normal\n"); 338 case REGULATOR_MODE_IDLE: 339 return sprintf(buf, "idle\n"); 340 case REGULATOR_MODE_STANDBY: 341 return sprintf(buf, "standby\n"); 342 } 343 return sprintf(buf, "unknown\n"); 344} 345 346static ssize_t regulator_opmode_show(struct device *dev, 347 struct device_attribute *attr, char *buf) 348{ 349 struct regulator_dev *rdev = dev_get_drvdata(dev); 350 351 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 352} 353static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 354 355static ssize_t regulator_print_state(char *buf, int state) 356{ 357 if (state > 0) 358 return sprintf(buf, "enabled\n"); 359 else if (state == 0) 360 return sprintf(buf, "disabled\n"); 361 else 362 return sprintf(buf, "unknown\n"); 363} 364 365static ssize_t regulator_state_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367{ 368 struct regulator_dev *rdev = dev_get_drvdata(dev); 369 ssize_t ret; 370 371 mutex_lock(&rdev->mutex); 372 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 373 mutex_unlock(&rdev->mutex); 374 375 return ret; 376} 377static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 378 379static ssize_t regulator_status_show(struct device *dev, 380 struct device_attribute *attr, char *buf) 381{ 382 struct regulator_dev *rdev = dev_get_drvdata(dev); 383 int status; 384 char *label; 385 386 status = rdev->desc->ops->get_status(rdev); 387 if (status < 0) 388 return status; 389 390 switch (status) { 391 case REGULATOR_STATUS_OFF: 392 label = "off"; 393 break; 394 case REGULATOR_STATUS_ON: 395 label = "on"; 396 break; 397 case REGULATOR_STATUS_ERROR: 398 label = "error"; 399 break; 400 case REGULATOR_STATUS_FAST: 401 label = "fast"; 402 break; 403 case REGULATOR_STATUS_NORMAL: 404 label = "normal"; 405 break; 406 case REGULATOR_STATUS_IDLE: 407 label = "idle"; 408 break; 409 case REGULATOR_STATUS_STANDBY: 410 label = "standby"; 411 break; 412 case REGULATOR_STATUS_BYPASS: 413 label = "bypass"; 414 break; 415 case REGULATOR_STATUS_UNDEFINED: 416 label = "undefined"; 417 break; 418 default: 419 return -ERANGE; 420 } 421 422 return sprintf(buf, "%s\n", label); 423} 424static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 425 426static ssize_t regulator_min_uA_show(struct device *dev, 427 struct device_attribute *attr, char *buf) 428{ 429 struct regulator_dev *rdev = dev_get_drvdata(dev); 430 431 if (!rdev->constraints) 432 return sprintf(buf, "constraint not defined\n"); 433 434 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 435} 436static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 437 438static ssize_t regulator_max_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->max_uA); 447} 448static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 449 450static ssize_t regulator_min_uV_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->min_uV); 459} 460static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 461 462static ssize_t regulator_max_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->max_uV); 471} 472static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 473 474static ssize_t regulator_total_uA_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 struct regulator *regulator; 479 int uA = 0; 480 481 mutex_lock(&rdev->mutex); 482 list_for_each_entry(regulator, &rdev->consumer_list, list) 483 uA += regulator->uA_load; 484 mutex_unlock(&rdev->mutex); 485 return sprintf(buf, "%d\n", uA); 486} 487static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 488 489static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 490 char *buf) 491{ 492 struct regulator_dev *rdev = dev_get_drvdata(dev); 493 return sprintf(buf, "%d\n", rdev->use_count); 494} 495static DEVICE_ATTR_RO(num_users); 496 497static ssize_t type_show(struct device *dev, struct device_attribute *attr, 498 char *buf) 499{ 500 struct regulator_dev *rdev = dev_get_drvdata(dev); 501 502 switch (rdev->desc->type) { 503 case REGULATOR_VOLTAGE: 504 return sprintf(buf, "voltage\n"); 505 case REGULATOR_CURRENT: 506 return sprintf(buf, "current\n"); 507 } 508 return sprintf(buf, "unknown\n"); 509} 510static DEVICE_ATTR_RO(type); 511 512static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 513 struct device_attribute *attr, char *buf) 514{ 515 struct regulator_dev *rdev = dev_get_drvdata(dev); 516 517 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 518} 519static DEVICE_ATTR(suspend_mem_microvolts, 0444, 520 regulator_suspend_mem_uV_show, NULL); 521 522static ssize_t regulator_suspend_disk_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_disk.uV); 528} 529static DEVICE_ATTR(suspend_disk_microvolts, 0444, 530 regulator_suspend_disk_uV_show, NULL); 531 532static ssize_t regulator_suspend_standby_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_standby.uV); 538} 539static DEVICE_ATTR(suspend_standby_microvolts, 0444, 540 regulator_suspend_standby_uV_show, NULL); 541 542static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544{ 545 struct regulator_dev *rdev = dev_get_drvdata(dev); 546 547 return regulator_print_opmode(buf, 548 rdev->constraints->state_mem.mode); 549} 550static DEVICE_ATTR(suspend_mem_mode, 0444, 551 regulator_suspend_mem_mode_show, NULL); 552 553static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 554 struct device_attribute *attr, char *buf) 555{ 556 struct regulator_dev *rdev = dev_get_drvdata(dev); 557 558 return regulator_print_opmode(buf, 559 rdev->constraints->state_disk.mode); 560} 561static DEVICE_ATTR(suspend_disk_mode, 0444, 562 regulator_suspend_disk_mode_show, NULL); 563 564static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 565 struct device_attribute *attr, char *buf) 566{ 567 struct regulator_dev *rdev = dev_get_drvdata(dev); 568 569 return regulator_print_opmode(buf, 570 rdev->constraints->state_standby.mode); 571} 572static DEVICE_ATTR(suspend_standby_mode, 0444, 573 regulator_suspend_standby_mode_show, NULL); 574 575static ssize_t regulator_suspend_mem_state_show(struct device *dev, 576 struct device_attribute *attr, char *buf) 577{ 578 struct regulator_dev *rdev = dev_get_drvdata(dev); 579 580 return regulator_print_state(buf, 581 rdev->constraints->state_mem.enabled); 582} 583static DEVICE_ATTR(suspend_mem_state, 0444, 584 regulator_suspend_mem_state_show, NULL); 585 586static ssize_t regulator_suspend_disk_state_show(struct device *dev, 587 struct device_attribute *attr, char *buf) 588{ 589 struct regulator_dev *rdev = dev_get_drvdata(dev); 590 591 return regulator_print_state(buf, 592 rdev->constraints->state_disk.enabled); 593} 594static DEVICE_ATTR(suspend_disk_state, 0444, 595 regulator_suspend_disk_state_show, NULL); 596 597static ssize_t regulator_suspend_standby_state_show(struct device *dev, 598 struct device_attribute *attr, char *buf) 599{ 600 struct regulator_dev *rdev = dev_get_drvdata(dev); 601 602 return regulator_print_state(buf, 603 rdev->constraints->state_standby.enabled); 604} 605static DEVICE_ATTR(suspend_standby_state, 0444, 606 regulator_suspend_standby_state_show, NULL); 607 608static ssize_t regulator_bypass_show(struct device *dev, 609 struct device_attribute *attr, char *buf) 610{ 611 struct regulator_dev *rdev = dev_get_drvdata(dev); 612 const char *report; 613 bool bypass; 614 int ret; 615 616 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 617 618 if (ret != 0) 619 report = "unknown"; 620 else if (bypass) 621 report = "enabled"; 622 else 623 report = "disabled"; 624 625 return sprintf(buf, "%s\n", report); 626} 627static DEVICE_ATTR(bypass, 0444, 628 regulator_bypass_show, NULL); 629 630/* 631 * These are the only attributes are present for all regulators. 632 * Other attributes are a function of regulator functionality. 633 */ 634static struct attribute *regulator_dev_attrs[] = { 635 &dev_attr_name.attr, 636 &dev_attr_num_users.attr, 637 &dev_attr_type.attr, 638 NULL, 639}; 640ATTRIBUTE_GROUPS(regulator_dev); 641 642static void regulator_dev_release(struct device *dev) 643{ 644 struct regulator_dev *rdev = dev_get_drvdata(dev); 645 kfree(rdev); 646} 647 648static struct class regulator_class = { 649 .name = "regulator", 650 .dev_release = regulator_dev_release, 651 .dev_groups = regulator_dev_groups, 652}; 653 654/* Calculate the new optimum regulator operating mode based on the new total 655 * consumer load. All locks held by caller */ 656static void drms_uA_update(struct regulator_dev *rdev) 657{ 658 struct regulator *sibling; 659 int current_uA = 0, output_uV, input_uV, err; 660 unsigned int mode; 661 662 err = regulator_check_drms(rdev); 663 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 664 (!rdev->desc->ops->get_voltage && 665 !rdev->desc->ops->get_voltage_sel) || 666 !rdev->desc->ops->set_mode) 667 return; 668 669 /* get output voltage */ 670 output_uV = _regulator_get_voltage(rdev); 671 if (output_uV <= 0) 672 return; 673 674 /* get input voltage */ 675 input_uV = 0; 676 if (rdev->supply) 677 input_uV = regulator_get_voltage(rdev->supply); 678 if (input_uV <= 0) 679 input_uV = rdev->constraints->input_uV; 680 if (input_uV <= 0) 681 return; 682 683 /* calc total requested load */ 684 list_for_each_entry(sibling, &rdev->consumer_list, list) 685 current_uA += sibling->uA_load; 686 687 /* now get the optimum mode for our new total regulator load */ 688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 689 output_uV, current_uA); 690 691 /* check the new mode is allowed */ 692 err = regulator_mode_constrain(rdev, &mode); 693 if (err == 0) 694 rdev->desc->ops->set_mode(rdev, mode); 695} 696 697static int suspend_set_state(struct regulator_dev *rdev, 698 struct regulator_state *rstate) 699{ 700 int ret = 0; 701 702 /* If we have no suspend mode configration don't set anything; 703 * only warn if the driver implements set_suspend_voltage or 704 * set_suspend_mode callback. 705 */ 706 if (!rstate->enabled && !rstate->disabled) { 707 if (rdev->desc->ops->set_suspend_voltage || 708 rdev->desc->ops->set_suspend_mode) 709 rdev_warn(rdev, "No configuration\n"); 710 return 0; 711 } 712 713 if (rstate->enabled && rstate->disabled) { 714 rdev_err(rdev, "invalid configuration\n"); 715 return -EINVAL; 716 } 717 718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 719 ret = rdev->desc->ops->set_suspend_enable(rdev); 720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 721 ret = rdev->desc->ops->set_suspend_disable(rdev); 722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 723 ret = 0; 724 725 if (ret < 0) { 726 rdev_err(rdev, "failed to enabled/disable\n"); 727 return ret; 728 } 729 730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 732 if (ret < 0) { 733 rdev_err(rdev, "failed to set voltage\n"); 734 return ret; 735 } 736 } 737 738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 740 if (ret < 0) { 741 rdev_err(rdev, "failed to set mode\n"); 742 return ret; 743 } 744 } 745 return ret; 746} 747 748/* locks held by caller */ 749static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 750{ 751 if (!rdev->constraints) 752 return -EINVAL; 753 754 switch (state) { 755 case PM_SUSPEND_STANDBY: 756 return suspend_set_state(rdev, 757 &rdev->constraints->state_standby); 758 case PM_SUSPEND_MEM: 759 return suspend_set_state(rdev, 760 &rdev->constraints->state_mem); 761 case PM_SUSPEND_MAX: 762 return suspend_set_state(rdev, 763 &rdev->constraints->state_disk); 764 default: 765 return -EINVAL; 766 } 767} 768 769static void print_constraints(struct regulator_dev *rdev) 770{ 771 struct regulation_constraints *constraints = rdev->constraints; 772 char buf[80] = ""; 773 int count = 0; 774 int ret; 775 776 if (constraints->min_uV && constraints->max_uV) { 777 if (constraints->min_uV == constraints->max_uV) 778 count += sprintf(buf + count, "%d mV ", 779 constraints->min_uV / 1000); 780 else 781 count += sprintf(buf + count, "%d <--> %d mV ", 782 constraints->min_uV / 1000, 783 constraints->max_uV / 1000); 784 } 785 786 if (!constraints->min_uV || 787 constraints->min_uV != constraints->max_uV) { 788 ret = _regulator_get_voltage(rdev); 789 if (ret > 0) 790 count += sprintf(buf + count, "at %d mV ", ret / 1000); 791 } 792 793 if (constraints->uV_offset) 794 count += sprintf(buf, "%dmV offset ", 795 constraints->uV_offset / 1000); 796 797 if (constraints->min_uA && constraints->max_uA) { 798 if (constraints->min_uA == constraints->max_uA) 799 count += sprintf(buf + count, "%d mA ", 800 constraints->min_uA / 1000); 801 else 802 count += sprintf(buf + count, "%d <--> %d mA ", 803 constraints->min_uA / 1000, 804 constraints->max_uA / 1000); 805 } 806 807 if (!constraints->min_uA || 808 constraints->min_uA != constraints->max_uA) { 809 ret = _regulator_get_current_limit(rdev); 810 if (ret > 0) 811 count += sprintf(buf + count, "at %d mA ", ret / 1000); 812 } 813 814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 815 count += sprintf(buf + count, "fast "); 816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 817 count += sprintf(buf + count, "normal "); 818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 819 count += sprintf(buf + count, "idle "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 821 count += sprintf(buf + count, "standby"); 822 823 if (!count) 824 sprintf(buf, "no parameters"); 825 826 rdev_info(rdev, "%s\n", buf); 827 828 if ((constraints->min_uV != constraints->max_uV) && 829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 830 rdev_warn(rdev, 831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 832} 833 834static int machine_constraints_voltage(struct regulator_dev *rdev, 835 struct regulation_constraints *constraints) 836{ 837 struct regulator_ops *ops = rdev->desc->ops; 838 int ret; 839 840 /* do we need to apply the constraint voltage */ 841 if (rdev->constraints->apply_uV && 842 rdev->constraints->min_uV == rdev->constraints->max_uV) { 843 ret = _regulator_do_set_voltage(rdev, 844 rdev->constraints->min_uV, 845 rdev->constraints->max_uV); 846 if (ret < 0) { 847 rdev_err(rdev, "failed to apply %duV constraint\n", 848 rdev->constraints->min_uV); 849 return ret; 850 } 851 } 852 853 /* constrain machine-level voltage specs to fit 854 * the actual range supported by this regulator. 855 */ 856 if (ops->list_voltage && rdev->desc->n_voltages) { 857 int count = rdev->desc->n_voltages; 858 int i; 859 int min_uV = INT_MAX; 860 int max_uV = INT_MIN; 861 int cmin = constraints->min_uV; 862 int cmax = constraints->max_uV; 863 864 /* it's safe to autoconfigure fixed-voltage supplies 865 and the constraints are used by list_voltage. */ 866 if (count == 1 && !cmin) { 867 cmin = 1; 868 cmax = INT_MAX; 869 constraints->min_uV = cmin; 870 constraints->max_uV = cmax; 871 } 872 873 /* voltage constraints are optional */ 874 if ((cmin == 0) && (cmax == 0)) 875 return 0; 876 877 /* else require explicit machine-level constraints */ 878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 879 rdev_err(rdev, "invalid voltage constraints\n"); 880 return -EINVAL; 881 } 882 883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 884 for (i = 0; i < count; i++) { 885 int value; 886 887 value = ops->list_voltage(rdev, i); 888 if (value <= 0) 889 continue; 890 891 /* maybe adjust [min_uV..max_uV] */ 892 if (value >= cmin && value < min_uV) 893 min_uV = value; 894 if (value <= cmax && value > max_uV) 895 max_uV = value; 896 } 897 898 /* final: [min_uV..max_uV] valid iff constraints valid */ 899 if (max_uV < min_uV) { 900 rdev_err(rdev, 901 "unsupportable voltage constraints %u-%uuV\n", 902 min_uV, max_uV); 903 return -EINVAL; 904 } 905 906 /* use regulator's subset of machine constraints */ 907 if (constraints->min_uV < min_uV) { 908 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 909 constraints->min_uV, min_uV); 910 constraints->min_uV = min_uV; 911 } 912 if (constraints->max_uV > max_uV) { 913 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 914 constraints->max_uV, max_uV); 915 constraints->max_uV = max_uV; 916 } 917 } 918 919 return 0; 920} 921 922/** 923 * set_machine_constraints - sets regulator constraints 924 * @rdev: regulator source 925 * @constraints: constraints to apply 926 * 927 * Allows platform initialisation code to define and constrain 928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 929 * Constraints *must* be set by platform code in order for some 930 * regulator operations to proceed i.e. set_voltage, set_current_limit, 931 * set_mode. 932 */ 933static int set_machine_constraints(struct regulator_dev *rdev, 934 const struct regulation_constraints *constraints) 935{ 936 int ret = 0; 937 struct regulator_ops *ops = rdev->desc->ops; 938 939 if (constraints) 940 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 941 GFP_KERNEL); 942 else 943 rdev->constraints = kzalloc(sizeof(*constraints), 944 GFP_KERNEL); 945 if (!rdev->constraints) 946 return -ENOMEM; 947 948 ret = machine_constraints_voltage(rdev, rdev->constraints); 949 if (ret != 0) 950 goto out; 951 952 /* do we need to setup our suspend state */ 953 if (rdev->constraints->initial_state) { 954 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 955 if (ret < 0) { 956 rdev_err(rdev, "failed to set suspend state\n"); 957 goto out; 958 } 959 } 960 961 if (rdev->constraints->initial_mode) { 962 if (!ops->set_mode) { 963 rdev_err(rdev, "no set_mode operation\n"); 964 ret = -EINVAL; 965 goto out; 966 } 967 968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 969 if (ret < 0) { 970 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 971 goto out; 972 } 973 } 974 975 /* If the constraints say the regulator should be on at this point 976 * and we have control then make sure it is enabled. 977 */ 978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 979 ops->enable) { 980 ret = ops->enable(rdev); 981 if (ret < 0) { 982 rdev_err(rdev, "failed to enable\n"); 983 goto out; 984 } 985 } 986 987 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 988 && ops->set_ramp_delay) { 989 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 990 if (ret < 0) { 991 rdev_err(rdev, "failed to set ramp_delay\n"); 992 goto out; 993 } 994 } 995 996 print_constraints(rdev); 997 return 0; 998out: 999 kfree(rdev->constraints); 1000 rdev->constraints = NULL; 1001 return ret; 1002} 1003 1004/** 1005 * set_supply - set regulator supply regulator 1006 * @rdev: regulator name 1007 * @supply_rdev: supply regulator name 1008 * 1009 * Called by platform initialisation code to set the supply regulator for this 1010 * regulator. This ensures that a regulators supply will also be enabled by the 1011 * core if it's child is enabled. 1012 */ 1013static int set_supply(struct regulator_dev *rdev, 1014 struct regulator_dev *supply_rdev) 1015{ 1016 int err; 1017 1018 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1019 1020 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1021 if (rdev->supply == NULL) { 1022 err = -ENOMEM; 1023 return err; 1024 } 1025 supply_rdev->open_count++; 1026 1027 return 0; 1028} 1029 1030/** 1031 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1032 * @rdev: regulator source 1033 * @consumer_dev_name: dev_name() string for device supply applies to 1034 * @supply: symbolic name for supply 1035 * 1036 * Allows platform initialisation code to map physical regulator 1037 * sources to symbolic names for supplies for use by devices. Devices 1038 * should use these symbolic names to request regulators, avoiding the 1039 * need to provide board-specific regulator names as platform data. 1040 */ 1041static int set_consumer_device_supply(struct regulator_dev *rdev, 1042 const char *consumer_dev_name, 1043 const char *supply) 1044{ 1045 struct regulator_map *node; 1046 int has_dev; 1047 1048 if (supply == NULL) 1049 return -EINVAL; 1050 1051 if (consumer_dev_name != NULL) 1052 has_dev = 1; 1053 else 1054 has_dev = 0; 1055 1056 list_for_each_entry(node, ®ulator_map_list, list) { 1057 if (node->dev_name && consumer_dev_name) { 1058 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1059 continue; 1060 } else if (node->dev_name || consumer_dev_name) { 1061 continue; 1062 } 1063 1064 if (strcmp(node->supply, supply) != 0) 1065 continue; 1066 1067 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1068 consumer_dev_name, 1069 dev_name(&node->regulator->dev), 1070 node->regulator->desc->name, 1071 supply, 1072 dev_name(&rdev->dev), rdev_get_name(rdev)); 1073 return -EBUSY; 1074 } 1075 1076 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1077 if (node == NULL) 1078 return -ENOMEM; 1079 1080 node->regulator = rdev; 1081 node->supply = supply; 1082 1083 if (has_dev) { 1084 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1085 if (node->dev_name == NULL) { 1086 kfree(node); 1087 return -ENOMEM; 1088 } 1089 } 1090 1091 list_add(&node->list, ®ulator_map_list); 1092 return 0; 1093} 1094 1095static void unset_regulator_supplies(struct regulator_dev *rdev) 1096{ 1097 struct regulator_map *node, *n; 1098 1099 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1100 if (rdev == node->regulator) { 1101 list_del(&node->list); 1102 kfree(node->dev_name); 1103 kfree(node); 1104 } 1105 } 1106} 1107 1108#define REG_STR_SIZE 64 1109 1110static struct regulator *create_regulator(struct regulator_dev *rdev, 1111 struct device *dev, 1112 const char *supply_name) 1113{ 1114 struct regulator *regulator; 1115 char buf[REG_STR_SIZE]; 1116 int err, size; 1117 1118 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1119 if (regulator == NULL) 1120 return NULL; 1121 1122 mutex_lock(&rdev->mutex); 1123 regulator->rdev = rdev; 1124 list_add(®ulator->list, &rdev->consumer_list); 1125 1126 if (dev) { 1127 regulator->dev = dev; 1128 1129 /* Add a link to the device sysfs entry */ 1130 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1131 dev->kobj.name, supply_name); 1132 if (size >= REG_STR_SIZE) 1133 goto overflow_err; 1134 1135 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1136 if (regulator->supply_name == NULL) 1137 goto overflow_err; 1138 1139 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1140 buf); 1141 if (err) { 1142 rdev_warn(rdev, "could not add device link %s err %d\n", 1143 dev->kobj.name, err); 1144 /* non-fatal */ 1145 } 1146 } else { 1147 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1148 if (regulator->supply_name == NULL) 1149 goto overflow_err; 1150 } 1151 1152 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1153 rdev->debugfs); 1154 if (!regulator->debugfs) { 1155 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1156 } else { 1157 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1158 ®ulator->uA_load); 1159 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1160 ®ulator->min_uV); 1161 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1162 ®ulator->max_uV); 1163 } 1164 1165 /* 1166 * Check now if the regulator is an always on regulator - if 1167 * it is then we don't need to do nearly so much work for 1168 * enable/disable calls. 1169 */ 1170 if (!_regulator_can_change_status(rdev) && 1171 _regulator_is_enabled(rdev)) 1172 regulator->always_on = true; 1173 1174 mutex_unlock(&rdev->mutex); 1175 return regulator; 1176overflow_err: 1177 list_del(®ulator->list); 1178 kfree(regulator); 1179 mutex_unlock(&rdev->mutex); 1180 return NULL; 1181} 1182 1183static int _regulator_get_enable_time(struct regulator_dev *rdev) 1184{ 1185 if (!rdev->desc->ops->enable_time) 1186 return rdev->desc->enable_time; 1187 return rdev->desc->ops->enable_time(rdev); 1188} 1189 1190static struct regulator_supply_alias *regulator_find_supply_alias( 1191 struct device *dev, const char *supply) 1192{ 1193 struct regulator_supply_alias *map; 1194 1195 list_for_each_entry(map, ®ulator_supply_alias_list, list) 1196 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) 1197 return map; 1198 1199 return NULL; 1200} 1201 1202static void regulator_supply_alias(struct device **dev, const char **supply) 1203{ 1204 struct regulator_supply_alias *map; 1205 1206 map = regulator_find_supply_alias(*dev, *supply); 1207 if (map) { 1208 dev_dbg(*dev, "Mapping supply %s to %s,%s\n", 1209 *supply, map->alias_supply, 1210 dev_name(map->alias_dev)); 1211 *dev = map->alias_dev; 1212 *supply = map->alias_supply; 1213 } 1214} 1215 1216static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1217 const char *supply, 1218 int *ret) 1219{ 1220 struct regulator_dev *r; 1221 struct device_node *node; 1222 struct regulator_map *map; 1223 const char *devname = NULL; 1224 1225 regulator_supply_alias(&dev, &supply); 1226 1227 /* first do a dt based lookup */ 1228 if (dev && dev->of_node) { 1229 node = of_get_regulator(dev, supply); 1230 if (node) { 1231 list_for_each_entry(r, ®ulator_list, list) 1232 if (r->dev.parent && 1233 node == r->dev.of_node) 1234 return r; 1235 } else { 1236 /* 1237 * If we couldn't even get the node then it's 1238 * not just that the device didn't register 1239 * yet, there's no node and we'll never 1240 * succeed. 1241 */ 1242 *ret = -ENODEV; 1243 } 1244 } 1245 1246 /* if not found, try doing it non-dt way */ 1247 if (dev) 1248 devname = dev_name(dev); 1249 1250 list_for_each_entry(r, ®ulator_list, list) 1251 if (strcmp(rdev_get_name(r), supply) == 0) 1252 return r; 1253 1254 list_for_each_entry(map, ®ulator_map_list, list) { 1255 /* If the mapping has a device set up it must match */ 1256 if (map->dev_name && 1257 (!devname || strcmp(map->dev_name, devname))) 1258 continue; 1259 1260 if (strcmp(map->supply, supply) == 0) 1261 return map->regulator; 1262 } 1263 1264 1265 return NULL; 1266} 1267 1268/* Internal regulator request function */ 1269static struct regulator *_regulator_get(struct device *dev, const char *id, 1270 bool exclusive) 1271{ 1272 struct regulator_dev *rdev; 1273 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1274 const char *devname = NULL; 1275 int ret = 0; 1276 1277 if (id == NULL) { 1278 pr_err("get() with no identifier\n"); 1279 return regulator; 1280 } 1281 1282 if (dev) 1283 devname = dev_name(dev); 1284 1285 mutex_lock(®ulator_list_mutex); 1286 1287 rdev = regulator_dev_lookup(dev, id, &ret); 1288 if (rdev) 1289 goto found; 1290 1291 /* 1292 * If we have return value from dev_lookup fail, we do not expect to 1293 * succeed, so, quit with appropriate error value 1294 */ 1295 if (ret) { 1296 regulator = ERR_PTR(ret); 1297 goto out; 1298 } 1299 1300 if (board_wants_dummy_regulator) { 1301 rdev = dummy_regulator_rdev; 1302 goto found; 1303 } 1304 1305#ifdef CONFIG_REGULATOR_DUMMY 1306 if (!devname) 1307 devname = "deviceless"; 1308 1309 /* If the board didn't flag that it was fully constrained then 1310 * substitute in a dummy regulator so consumers can continue. 1311 */ 1312 if (!has_full_constraints) { 1313 pr_warn("%s supply %s not found, using dummy regulator\n", 1314 devname, id); 1315 rdev = dummy_regulator_rdev; 1316 goto found; 1317 } 1318#endif 1319 1320 mutex_unlock(®ulator_list_mutex); 1321 return regulator; 1322 1323found: 1324 if (rdev->exclusive) { 1325 regulator = ERR_PTR(-EPERM); 1326 goto out; 1327 } 1328 1329 if (exclusive && rdev->open_count) { 1330 regulator = ERR_PTR(-EBUSY); 1331 goto out; 1332 } 1333 1334 if (!try_module_get(rdev->owner)) 1335 goto out; 1336 1337 regulator = create_regulator(rdev, dev, id); 1338 if (regulator == NULL) { 1339 regulator = ERR_PTR(-ENOMEM); 1340 module_put(rdev->owner); 1341 goto out; 1342 } 1343 1344 rdev->open_count++; 1345 if (exclusive) { 1346 rdev->exclusive = 1; 1347 1348 ret = _regulator_is_enabled(rdev); 1349 if (ret > 0) 1350 rdev->use_count = 1; 1351 else 1352 rdev->use_count = 0; 1353 } 1354 1355out: 1356 mutex_unlock(®ulator_list_mutex); 1357 1358 return regulator; 1359} 1360 1361/** 1362 * regulator_get - lookup and obtain a reference to a regulator. 1363 * @dev: device for regulator "consumer" 1364 * @id: Supply name or regulator ID. 1365 * 1366 * Returns a struct regulator corresponding to the regulator producer, 1367 * or IS_ERR() condition containing errno. 1368 * 1369 * Use of supply names configured via regulator_set_device_supply() is 1370 * strongly encouraged. It is recommended that the supply name used 1371 * should match the name used for the supply and/or the relevant 1372 * device pins in the datasheet. 1373 */ 1374struct regulator *regulator_get(struct device *dev, const char *id) 1375{ 1376 return _regulator_get(dev, id, false); 1377} 1378EXPORT_SYMBOL_GPL(regulator_get); 1379 1380/** 1381 * regulator_get_exclusive - obtain exclusive access to a regulator. 1382 * @dev: device for regulator "consumer" 1383 * @id: Supply name or regulator ID. 1384 * 1385 * Returns a struct regulator corresponding to the regulator producer, 1386 * or IS_ERR() condition containing errno. Other consumers will be 1387 * unable to obtain this reference is held and the use count for the 1388 * regulator will be initialised to reflect the current state of the 1389 * regulator. 1390 * 1391 * This is intended for use by consumers which cannot tolerate shared 1392 * use of the regulator such as those which need to force the 1393 * regulator off for correct operation of the hardware they are 1394 * controlling. 1395 * 1396 * Use of supply names configured via regulator_set_device_supply() is 1397 * strongly encouraged. It is recommended that the supply name used 1398 * should match the name used for the supply and/or the relevant 1399 * device pins in the datasheet. 1400 */ 1401struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1402{ 1403 return _regulator_get(dev, id, true); 1404} 1405EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1406 1407/** 1408 * regulator_get_optional - obtain optional access to a regulator. 1409 * @dev: device for regulator "consumer" 1410 * @id: Supply name or regulator ID. 1411 * 1412 * Returns a struct regulator corresponding to the regulator producer, 1413 * or IS_ERR() condition containing errno. Other consumers will be 1414 * unable to obtain this reference is held and the use count for the 1415 * regulator will be initialised to reflect the current state of the 1416 * regulator. 1417 * 1418 * This is intended for use by consumers for devices which can have 1419 * some supplies unconnected in normal use, such as some MMC devices. 1420 * It can allow the regulator core to provide stub supplies for other 1421 * supplies requested using normal regulator_get() calls without 1422 * disrupting the operation of drivers that can handle absent 1423 * supplies. 1424 * 1425 * Use of supply names configured via regulator_set_device_supply() is 1426 * strongly encouraged. It is recommended that the supply name used 1427 * should match the name used for the supply and/or the relevant 1428 * device pins in the datasheet. 1429 */ 1430struct regulator *regulator_get_optional(struct device *dev, const char *id) 1431{ 1432 return _regulator_get(dev, id, 0); 1433} 1434EXPORT_SYMBOL_GPL(regulator_get_optional); 1435 1436/* Locks held by regulator_put() */ 1437static void _regulator_put(struct regulator *regulator) 1438{ 1439 struct regulator_dev *rdev; 1440 1441 if (regulator == NULL || IS_ERR(regulator)) 1442 return; 1443 1444 rdev = regulator->rdev; 1445 1446 debugfs_remove_recursive(regulator->debugfs); 1447 1448 /* remove any sysfs entries */ 1449 if (regulator->dev) 1450 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1451 kfree(regulator->supply_name); 1452 list_del(®ulator->list); 1453 kfree(regulator); 1454 1455 rdev->open_count--; 1456 rdev->exclusive = 0; 1457 1458 module_put(rdev->owner); 1459} 1460 1461/** 1462 * regulator_put - "free" the regulator source 1463 * @regulator: regulator source 1464 * 1465 * Note: drivers must ensure that all regulator_enable calls made on this 1466 * regulator source are balanced by regulator_disable calls prior to calling 1467 * this function. 1468 */ 1469void regulator_put(struct regulator *regulator) 1470{ 1471 mutex_lock(®ulator_list_mutex); 1472 _regulator_put(regulator); 1473 mutex_unlock(®ulator_list_mutex); 1474} 1475EXPORT_SYMBOL_GPL(regulator_put); 1476 1477/** 1478 * regulator_register_supply_alias - Provide device alias for supply lookup 1479 * 1480 * @dev: device that will be given as the regulator "consumer" 1481 * @id: Supply name or regulator ID 1482 * @alias_dev: device that should be used to lookup the supply 1483 * @alias_id: Supply name or regulator ID that should be used to lookup the 1484 * supply 1485 * 1486 * All lookups for id on dev will instead be conducted for alias_id on 1487 * alias_dev. 1488 */ 1489int regulator_register_supply_alias(struct device *dev, const char *id, 1490 struct device *alias_dev, 1491 const char *alias_id) 1492{ 1493 struct regulator_supply_alias *map; 1494 1495 map = regulator_find_supply_alias(dev, id); 1496 if (map) 1497 return -EEXIST; 1498 1499 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1500 if (!map) 1501 return -ENOMEM; 1502 1503 map->src_dev = dev; 1504 map->src_supply = id; 1505 map->alias_dev = alias_dev; 1506 map->alias_supply = alias_id; 1507 1508 list_add(&map->list, ®ulator_supply_alias_list); 1509 1510 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1511 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1512 1513 return 0; 1514} 1515EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1516 1517/** 1518 * regulator_unregister_supply_alias - Remove device alias 1519 * 1520 * @dev: device that will be given as the regulator "consumer" 1521 * @id: Supply name or regulator ID 1522 * 1523 * Remove a lookup alias if one exists for id on dev. 1524 */ 1525void regulator_unregister_supply_alias(struct device *dev, const char *id) 1526{ 1527 struct regulator_supply_alias *map; 1528 1529 map = regulator_find_supply_alias(dev, id); 1530 if (map) { 1531 list_del(&map->list); 1532 kfree(map); 1533 } 1534} 1535EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1536 1537/** 1538 * regulator_bulk_register_supply_alias - register multiple aliases 1539 * 1540 * @dev: device that will be given as the regulator "consumer" 1541 * @id: List of supply names or regulator IDs 1542 * @alias_dev: device that should be used to lookup the supply 1543 * @alias_id: List of supply names or regulator IDs that should be used to 1544 * lookup the supply 1545 * @num_id: Number of aliases to register 1546 * 1547 * @return 0 on success, an errno on failure. 1548 * 1549 * This helper function allows drivers to register several supply 1550 * aliases in one operation. If any of the aliases cannot be 1551 * registered any aliases that were registered will be removed 1552 * before returning to the caller. 1553 */ 1554int regulator_bulk_register_supply_alias(struct device *dev, const char **id, 1555 struct device *alias_dev, 1556 const char **alias_id, 1557 int num_id) 1558{ 1559 int i; 1560 int ret; 1561 1562 for (i = 0; i < num_id; ++i) { 1563 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1564 alias_id[i]); 1565 if (ret < 0) 1566 goto err; 1567 } 1568 1569 return 0; 1570 1571err: 1572 dev_err(dev, 1573 "Failed to create supply alias %s,%s -> %s,%s\n", 1574 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1575 1576 while (--i >= 0) 1577 regulator_unregister_supply_alias(dev, id[i]); 1578 1579 return ret; 1580} 1581EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1582 1583/** 1584 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1585 * 1586 * @dev: device that will be given as the regulator "consumer" 1587 * @id: List of supply names or regulator IDs 1588 * @num_id: Number of aliases to unregister 1589 * 1590 * This helper function allows drivers to unregister several supply 1591 * aliases in one operation. 1592 */ 1593void regulator_bulk_unregister_supply_alias(struct device *dev, 1594 const char **id, 1595 int num_id) 1596{ 1597 int i; 1598 1599 for (i = 0; i < num_id; ++i) 1600 regulator_unregister_supply_alias(dev, id[i]); 1601} 1602EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1603 1604 1605/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1606static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1607 const struct regulator_config *config) 1608{ 1609 struct regulator_enable_gpio *pin; 1610 int ret; 1611 1612 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1613 if (pin->gpio == config->ena_gpio) { 1614 rdev_dbg(rdev, "GPIO %d is already used\n", 1615 config->ena_gpio); 1616 goto update_ena_gpio_to_rdev; 1617 } 1618 } 1619 1620 ret = gpio_request_one(config->ena_gpio, 1621 GPIOF_DIR_OUT | config->ena_gpio_flags, 1622 rdev_get_name(rdev)); 1623 if (ret) 1624 return ret; 1625 1626 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1627 if (pin == NULL) { 1628 gpio_free(config->ena_gpio); 1629 return -ENOMEM; 1630 } 1631 1632 pin->gpio = config->ena_gpio; 1633 pin->ena_gpio_invert = config->ena_gpio_invert; 1634 list_add(&pin->list, ®ulator_ena_gpio_list); 1635 1636update_ena_gpio_to_rdev: 1637 pin->request_count++; 1638 rdev->ena_pin = pin; 1639 return 0; 1640} 1641 1642static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1643{ 1644 struct regulator_enable_gpio *pin, *n; 1645 1646 if (!rdev->ena_pin) 1647 return; 1648 1649 /* Free the GPIO only in case of no use */ 1650 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1651 if (pin->gpio == rdev->ena_pin->gpio) { 1652 if (pin->request_count <= 1) { 1653 pin->request_count = 0; 1654 gpio_free(pin->gpio); 1655 list_del(&pin->list); 1656 kfree(pin); 1657 } else { 1658 pin->request_count--; 1659 } 1660 } 1661 } 1662} 1663 1664/** 1665 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1666 * @rdev: regulator_dev structure 1667 * @enable: enable GPIO at initial use? 1668 * 1669 * GPIO is enabled in case of initial use. (enable_count is 0) 1670 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1671 */ 1672static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1673{ 1674 struct regulator_enable_gpio *pin = rdev->ena_pin; 1675 1676 if (!pin) 1677 return -EINVAL; 1678 1679 if (enable) { 1680 /* Enable GPIO at initial use */ 1681 if (pin->enable_count == 0) 1682 gpio_set_value_cansleep(pin->gpio, 1683 !pin->ena_gpio_invert); 1684 1685 pin->enable_count++; 1686 } else { 1687 if (pin->enable_count > 1) { 1688 pin->enable_count--; 1689 return 0; 1690 } 1691 1692 /* Disable GPIO if not used */ 1693 if (pin->enable_count <= 1) { 1694 gpio_set_value_cansleep(pin->gpio, 1695 pin->ena_gpio_invert); 1696 pin->enable_count = 0; 1697 } 1698 } 1699 1700 return 0; 1701} 1702 1703static int _regulator_do_enable(struct regulator_dev *rdev) 1704{ 1705 int ret, delay; 1706 1707 /* Query before enabling in case configuration dependent. */ 1708 ret = _regulator_get_enable_time(rdev); 1709 if (ret >= 0) { 1710 delay = ret; 1711 } else { 1712 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1713 delay = 0; 1714 } 1715 1716 trace_regulator_enable(rdev_get_name(rdev)); 1717 1718 if (rdev->ena_pin) { 1719 ret = regulator_ena_gpio_ctrl(rdev, true); 1720 if (ret < 0) 1721 return ret; 1722 rdev->ena_gpio_state = 1; 1723 } else if (rdev->desc->ops->enable) { 1724 ret = rdev->desc->ops->enable(rdev); 1725 if (ret < 0) 1726 return ret; 1727 } else { 1728 return -EINVAL; 1729 } 1730 1731 /* Allow the regulator to ramp; it would be useful to extend 1732 * this for bulk operations so that the regulators can ramp 1733 * together. */ 1734 trace_regulator_enable_delay(rdev_get_name(rdev)); 1735 1736 if (delay >= 1000) { 1737 mdelay(delay / 1000); 1738 udelay(delay % 1000); 1739 } else if (delay) { 1740 udelay(delay); 1741 } 1742 1743 trace_regulator_enable_complete(rdev_get_name(rdev)); 1744 1745 return 0; 1746} 1747 1748/* locks held by regulator_enable() */ 1749static int _regulator_enable(struct regulator_dev *rdev) 1750{ 1751 int ret; 1752 1753 /* check voltage and requested load before enabling */ 1754 if (rdev->constraints && 1755 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1756 drms_uA_update(rdev); 1757 1758 if (rdev->use_count == 0) { 1759 /* The regulator may on if it's not switchable or left on */ 1760 ret = _regulator_is_enabled(rdev); 1761 if (ret == -EINVAL || ret == 0) { 1762 if (!_regulator_can_change_status(rdev)) 1763 return -EPERM; 1764 1765 ret = _regulator_do_enable(rdev); 1766 if (ret < 0) 1767 return ret; 1768 1769 } else if (ret < 0) { 1770 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1771 return ret; 1772 } 1773 /* Fallthrough on positive return values - already enabled */ 1774 } 1775 1776 rdev->use_count++; 1777 1778 return 0; 1779} 1780 1781/** 1782 * regulator_enable - enable regulator output 1783 * @regulator: regulator source 1784 * 1785 * Request that the regulator be enabled with the regulator output at 1786 * the predefined voltage or current value. Calls to regulator_enable() 1787 * must be balanced with calls to regulator_disable(). 1788 * 1789 * NOTE: the output value can be set by other drivers, boot loader or may be 1790 * hardwired in the regulator. 1791 */ 1792int regulator_enable(struct regulator *regulator) 1793{ 1794 struct regulator_dev *rdev = regulator->rdev; 1795 int ret = 0; 1796 1797 if (regulator->always_on) 1798 return 0; 1799 1800 if (rdev->supply) { 1801 ret = regulator_enable(rdev->supply); 1802 if (ret != 0) 1803 return ret; 1804 } 1805 1806 mutex_lock(&rdev->mutex); 1807 ret = _regulator_enable(rdev); 1808 mutex_unlock(&rdev->mutex); 1809 1810 if (ret != 0 && rdev->supply) 1811 regulator_disable(rdev->supply); 1812 1813 return ret; 1814} 1815EXPORT_SYMBOL_GPL(regulator_enable); 1816 1817static int _regulator_do_disable(struct regulator_dev *rdev) 1818{ 1819 int ret; 1820 1821 trace_regulator_disable(rdev_get_name(rdev)); 1822 1823 if (rdev->ena_pin) { 1824 ret = regulator_ena_gpio_ctrl(rdev, false); 1825 if (ret < 0) 1826 return ret; 1827 rdev->ena_gpio_state = 0; 1828 1829 } else if (rdev->desc->ops->disable) { 1830 ret = rdev->desc->ops->disable(rdev); 1831 if (ret != 0) 1832 return ret; 1833 } 1834 1835 trace_regulator_disable_complete(rdev_get_name(rdev)); 1836 1837 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1838 NULL); 1839 return 0; 1840} 1841 1842/* locks held by regulator_disable() */ 1843static int _regulator_disable(struct regulator_dev *rdev) 1844{ 1845 int ret = 0; 1846 1847 if (WARN(rdev->use_count <= 0, 1848 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1849 return -EIO; 1850 1851 /* are we the last user and permitted to disable ? */ 1852 if (rdev->use_count == 1 && 1853 (rdev->constraints && !rdev->constraints->always_on)) { 1854 1855 /* we are last user */ 1856 if (_regulator_can_change_status(rdev)) { 1857 ret = _regulator_do_disable(rdev); 1858 if (ret < 0) { 1859 rdev_err(rdev, "failed to disable\n"); 1860 return ret; 1861 } 1862 } 1863 1864 rdev->use_count = 0; 1865 } else if (rdev->use_count > 1) { 1866 1867 if (rdev->constraints && 1868 (rdev->constraints->valid_ops_mask & 1869 REGULATOR_CHANGE_DRMS)) 1870 drms_uA_update(rdev); 1871 1872 rdev->use_count--; 1873 } 1874 1875 return ret; 1876} 1877 1878/** 1879 * regulator_disable - disable regulator output 1880 * @regulator: regulator source 1881 * 1882 * Disable the regulator output voltage or current. Calls to 1883 * regulator_enable() must be balanced with calls to 1884 * regulator_disable(). 1885 * 1886 * NOTE: this will only disable the regulator output if no other consumer 1887 * devices have it enabled, the regulator device supports disabling and 1888 * machine constraints permit this operation. 1889 */ 1890int regulator_disable(struct regulator *regulator) 1891{ 1892 struct regulator_dev *rdev = regulator->rdev; 1893 int ret = 0; 1894 1895 if (regulator->always_on) 1896 return 0; 1897 1898 mutex_lock(&rdev->mutex); 1899 ret = _regulator_disable(rdev); 1900 mutex_unlock(&rdev->mutex); 1901 1902 if (ret == 0 && rdev->supply) 1903 regulator_disable(rdev->supply); 1904 1905 return ret; 1906} 1907EXPORT_SYMBOL_GPL(regulator_disable); 1908 1909/* locks held by regulator_force_disable() */ 1910static int _regulator_force_disable(struct regulator_dev *rdev) 1911{ 1912 int ret = 0; 1913 1914 /* force disable */ 1915 if (rdev->desc->ops->disable) { 1916 /* ah well, who wants to live forever... */ 1917 ret = rdev->desc->ops->disable(rdev); 1918 if (ret < 0) { 1919 rdev_err(rdev, "failed to force disable\n"); 1920 return ret; 1921 } 1922 /* notify other consumers that power has been forced off */ 1923 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1924 REGULATOR_EVENT_DISABLE, NULL); 1925 } 1926 1927 return ret; 1928} 1929 1930/** 1931 * regulator_force_disable - force disable regulator output 1932 * @regulator: regulator source 1933 * 1934 * Forcibly disable the regulator output voltage or current. 1935 * NOTE: this *will* disable the regulator output even if other consumer 1936 * devices have it enabled. This should be used for situations when device 1937 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1938 */ 1939int regulator_force_disable(struct regulator *regulator) 1940{ 1941 struct regulator_dev *rdev = regulator->rdev; 1942 int ret; 1943 1944 mutex_lock(&rdev->mutex); 1945 regulator->uA_load = 0; 1946 ret = _regulator_force_disable(regulator->rdev); 1947 mutex_unlock(&rdev->mutex); 1948 1949 if (rdev->supply) 1950 while (rdev->open_count--) 1951 regulator_disable(rdev->supply); 1952 1953 return ret; 1954} 1955EXPORT_SYMBOL_GPL(regulator_force_disable); 1956 1957static void regulator_disable_work(struct work_struct *work) 1958{ 1959 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1960 disable_work.work); 1961 int count, i, ret; 1962 1963 mutex_lock(&rdev->mutex); 1964 1965 BUG_ON(!rdev->deferred_disables); 1966 1967 count = rdev->deferred_disables; 1968 rdev->deferred_disables = 0; 1969 1970 for (i = 0; i < count; i++) { 1971 ret = _regulator_disable(rdev); 1972 if (ret != 0) 1973 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1974 } 1975 1976 mutex_unlock(&rdev->mutex); 1977 1978 if (rdev->supply) { 1979 for (i = 0; i < count; i++) { 1980 ret = regulator_disable(rdev->supply); 1981 if (ret != 0) { 1982 rdev_err(rdev, 1983 "Supply disable failed: %d\n", ret); 1984 } 1985 } 1986 } 1987} 1988 1989/** 1990 * regulator_disable_deferred - disable regulator output with delay 1991 * @regulator: regulator source 1992 * @ms: miliseconds until the regulator is disabled 1993 * 1994 * Execute regulator_disable() on the regulator after a delay. This 1995 * is intended for use with devices that require some time to quiesce. 1996 * 1997 * NOTE: this will only disable the regulator output if no other consumer 1998 * devices have it enabled, the regulator device supports disabling and 1999 * machine constraints permit this operation. 2000 */ 2001int regulator_disable_deferred(struct regulator *regulator, int ms) 2002{ 2003 struct regulator_dev *rdev = regulator->rdev; 2004 int ret; 2005 2006 if (regulator->always_on) 2007 return 0; 2008 2009 if (!ms) 2010 return regulator_disable(regulator); 2011 2012 mutex_lock(&rdev->mutex); 2013 rdev->deferred_disables++; 2014 mutex_unlock(&rdev->mutex); 2015 2016 ret = queue_delayed_work(system_power_efficient_wq, 2017 &rdev->disable_work, 2018 msecs_to_jiffies(ms)); 2019 if (ret < 0) 2020 return ret; 2021 else 2022 return 0; 2023} 2024EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2025 2026static int _regulator_is_enabled(struct regulator_dev *rdev) 2027{ 2028 /* A GPIO control always takes precedence */ 2029 if (rdev->ena_pin) 2030 return rdev->ena_gpio_state; 2031 2032 /* If we don't know then assume that the regulator is always on */ 2033 if (!rdev->desc->ops->is_enabled) 2034 return 1; 2035 2036 return rdev->desc->ops->is_enabled(rdev); 2037} 2038 2039/** 2040 * regulator_is_enabled - is the regulator output enabled 2041 * @regulator: regulator source 2042 * 2043 * Returns positive if the regulator driver backing the source/client 2044 * has requested that the device be enabled, zero if it hasn't, else a 2045 * negative errno code. 2046 * 2047 * Note that the device backing this regulator handle can have multiple 2048 * users, so it might be enabled even if regulator_enable() was never 2049 * called for this particular source. 2050 */ 2051int regulator_is_enabled(struct regulator *regulator) 2052{ 2053 int ret; 2054 2055 if (regulator->always_on) 2056 return 1; 2057 2058 mutex_lock(®ulator->rdev->mutex); 2059 ret = _regulator_is_enabled(regulator->rdev); 2060 mutex_unlock(®ulator->rdev->mutex); 2061 2062 return ret; 2063} 2064EXPORT_SYMBOL_GPL(regulator_is_enabled); 2065 2066/** 2067 * regulator_can_change_voltage - check if regulator can change voltage 2068 * @regulator: regulator source 2069 * 2070 * Returns positive if the regulator driver backing the source/client 2071 * can change its voltage, false otherwise. Usefull for detecting fixed 2072 * or dummy regulators and disabling voltage change logic in the client 2073 * driver. 2074 */ 2075int regulator_can_change_voltage(struct regulator *regulator) 2076{ 2077 struct regulator_dev *rdev = regulator->rdev; 2078 2079 if (rdev->constraints && 2080 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2081 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2082 return 1; 2083 2084 if (rdev->desc->continuous_voltage_range && 2085 rdev->constraints->min_uV && rdev->constraints->max_uV && 2086 rdev->constraints->min_uV != rdev->constraints->max_uV) 2087 return 1; 2088 } 2089 2090 return 0; 2091} 2092EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2093 2094/** 2095 * regulator_count_voltages - count regulator_list_voltage() selectors 2096 * @regulator: regulator source 2097 * 2098 * Returns number of selectors, or negative errno. Selectors are 2099 * numbered starting at zero, and typically correspond to bitfields 2100 * in hardware registers. 2101 */ 2102int regulator_count_voltages(struct regulator *regulator) 2103{ 2104 struct regulator_dev *rdev = regulator->rdev; 2105 2106 return rdev->desc->n_voltages ? : -EINVAL; 2107} 2108EXPORT_SYMBOL_GPL(regulator_count_voltages); 2109 2110/** 2111 * regulator_list_voltage - enumerate supported voltages 2112 * @regulator: regulator source 2113 * @selector: identify voltage to list 2114 * Context: can sleep 2115 * 2116 * Returns a voltage that can be passed to @regulator_set_voltage(), 2117 * zero if this selector code can't be used on this system, or a 2118 * negative errno. 2119 */ 2120int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2121{ 2122 struct regulator_dev *rdev = regulator->rdev; 2123 struct regulator_ops *ops = rdev->desc->ops; 2124 int ret; 2125 2126 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2127 return -EINVAL; 2128 2129 mutex_lock(&rdev->mutex); 2130 ret = ops->list_voltage(rdev, selector); 2131 mutex_unlock(&rdev->mutex); 2132 2133 if (ret > 0) { 2134 if (ret < rdev->constraints->min_uV) 2135 ret = 0; 2136 else if (ret > rdev->constraints->max_uV) 2137 ret = 0; 2138 } 2139 2140 return ret; 2141} 2142EXPORT_SYMBOL_GPL(regulator_list_voltage); 2143 2144/** 2145 * regulator_get_linear_step - return the voltage step size between VSEL values 2146 * @regulator: regulator source 2147 * 2148 * Returns the voltage step size between VSEL values for linear 2149 * regulators, or return 0 if the regulator isn't a linear regulator. 2150 */ 2151unsigned int regulator_get_linear_step(struct regulator *regulator) 2152{ 2153 struct regulator_dev *rdev = regulator->rdev; 2154 2155 return rdev->desc->uV_step; 2156} 2157EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2158 2159/** 2160 * regulator_is_supported_voltage - check if a voltage range can be supported 2161 * 2162 * @regulator: Regulator to check. 2163 * @min_uV: Minimum required voltage in uV. 2164 * @max_uV: Maximum required voltage in uV. 2165 * 2166 * Returns a boolean or a negative error code. 2167 */ 2168int regulator_is_supported_voltage(struct regulator *regulator, 2169 int min_uV, int max_uV) 2170{ 2171 struct regulator_dev *rdev = regulator->rdev; 2172 int i, voltages, ret; 2173 2174 /* If we can't change voltage check the current voltage */ 2175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2176 ret = regulator_get_voltage(regulator); 2177 if (ret >= 0) 2178 return (min_uV <= ret && ret <= max_uV); 2179 else 2180 return ret; 2181 } 2182 2183 /* Any voltage within constrains range is fine? */ 2184 if (rdev->desc->continuous_voltage_range) 2185 return min_uV >= rdev->constraints->min_uV && 2186 max_uV <= rdev->constraints->max_uV; 2187 2188 ret = regulator_count_voltages(regulator); 2189 if (ret < 0) 2190 return ret; 2191 voltages = ret; 2192 2193 for (i = 0; i < voltages; i++) { 2194 ret = regulator_list_voltage(regulator, i); 2195 2196 if (ret >= min_uV && ret <= max_uV) 2197 return 1; 2198 } 2199 2200 return 0; 2201} 2202EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2203 2204static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2205 int min_uV, int max_uV) 2206{ 2207 int ret; 2208 int delay = 0; 2209 int best_val = 0; 2210 unsigned int selector; 2211 int old_selector = -1; 2212 2213 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2214 2215 min_uV += rdev->constraints->uV_offset; 2216 max_uV += rdev->constraints->uV_offset; 2217 2218 /* 2219 * If we can't obtain the old selector there is not enough 2220 * info to call set_voltage_time_sel(). 2221 */ 2222 if (_regulator_is_enabled(rdev) && 2223 rdev->desc->ops->set_voltage_time_sel && 2224 rdev->desc->ops->get_voltage_sel) { 2225 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2226 if (old_selector < 0) 2227 return old_selector; 2228 } 2229 2230 if (rdev->desc->ops->set_voltage) { 2231 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2232 &selector); 2233 2234 if (ret >= 0) { 2235 if (rdev->desc->ops->list_voltage) 2236 best_val = rdev->desc->ops->list_voltage(rdev, 2237 selector); 2238 else 2239 best_val = _regulator_get_voltage(rdev); 2240 } 2241 2242 } else if (rdev->desc->ops->set_voltage_sel) { 2243 if (rdev->desc->ops->map_voltage) { 2244 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2245 max_uV); 2246 } else { 2247 if (rdev->desc->ops->list_voltage == 2248 regulator_list_voltage_linear) 2249 ret = regulator_map_voltage_linear(rdev, 2250 min_uV, max_uV); 2251 else 2252 ret = regulator_map_voltage_iterate(rdev, 2253 min_uV, max_uV); 2254 } 2255 2256 if (ret >= 0) { 2257 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2258 if (min_uV <= best_val && max_uV >= best_val) { 2259 selector = ret; 2260 if (old_selector == selector) 2261 ret = 0; 2262 else 2263 ret = rdev->desc->ops->set_voltage_sel( 2264 rdev, ret); 2265 } else { 2266 ret = -EINVAL; 2267 } 2268 } 2269 } else { 2270 ret = -EINVAL; 2271 } 2272 2273 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2274 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2275 && old_selector != selector) { 2276 2277 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2278 old_selector, selector); 2279 if (delay < 0) { 2280 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2281 delay); 2282 delay = 0; 2283 } 2284 2285 /* Insert any necessary delays */ 2286 if (delay >= 1000) { 2287 mdelay(delay / 1000); 2288 udelay(delay % 1000); 2289 } else if (delay) { 2290 udelay(delay); 2291 } 2292 } 2293 2294 if (ret == 0 && best_val >= 0) { 2295 unsigned long data = best_val; 2296 2297 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2298 (void *)data); 2299 } 2300 2301 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2302 2303 return ret; 2304} 2305 2306/** 2307 * regulator_set_voltage - set regulator output voltage 2308 * @regulator: regulator source 2309 * @min_uV: Minimum required voltage in uV 2310 * @max_uV: Maximum acceptable voltage in uV 2311 * 2312 * Sets a voltage regulator to the desired output voltage. This can be set 2313 * during any regulator state. IOW, regulator can be disabled or enabled. 2314 * 2315 * If the regulator is enabled then the voltage will change to the new value 2316 * immediately otherwise if the regulator is disabled the regulator will 2317 * output at the new voltage when enabled. 2318 * 2319 * NOTE: If the regulator is shared between several devices then the lowest 2320 * request voltage that meets the system constraints will be used. 2321 * Regulator system constraints must be set for this regulator before 2322 * calling this function otherwise this call will fail. 2323 */ 2324int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2325{ 2326 struct regulator_dev *rdev = regulator->rdev; 2327 int ret = 0; 2328 int old_min_uV, old_max_uV; 2329 2330 mutex_lock(&rdev->mutex); 2331 2332 /* If we're setting the same range as last time the change 2333 * should be a noop (some cpufreq implementations use the same 2334 * voltage for multiple frequencies, for example). 2335 */ 2336 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2337 goto out; 2338 2339 /* sanity check */ 2340 if (!rdev->desc->ops->set_voltage && 2341 !rdev->desc->ops->set_voltage_sel) { 2342 ret = -EINVAL; 2343 goto out; 2344 } 2345 2346 /* constraints check */ 2347 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2348 if (ret < 0) 2349 goto out; 2350 2351 /* restore original values in case of error */ 2352 old_min_uV = regulator->min_uV; 2353 old_max_uV = regulator->max_uV; 2354 regulator->min_uV = min_uV; 2355 regulator->max_uV = max_uV; 2356 2357 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2358 if (ret < 0) 2359 goto out2; 2360 2361 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2362 if (ret < 0) 2363 goto out2; 2364 2365out: 2366 mutex_unlock(&rdev->mutex); 2367 return ret; 2368out2: 2369 regulator->min_uV = old_min_uV; 2370 regulator->max_uV = old_max_uV; 2371 mutex_unlock(&rdev->mutex); 2372 return ret; 2373} 2374EXPORT_SYMBOL_GPL(regulator_set_voltage); 2375 2376/** 2377 * regulator_set_voltage_time - get raise/fall time 2378 * @regulator: regulator source 2379 * @old_uV: starting voltage in microvolts 2380 * @new_uV: target voltage in microvolts 2381 * 2382 * Provided with the starting and ending voltage, this function attempts to 2383 * calculate the time in microseconds required to rise or fall to this new 2384 * voltage. 2385 */ 2386int regulator_set_voltage_time(struct regulator *regulator, 2387 int old_uV, int new_uV) 2388{ 2389 struct regulator_dev *rdev = regulator->rdev; 2390 struct regulator_ops *ops = rdev->desc->ops; 2391 int old_sel = -1; 2392 int new_sel = -1; 2393 int voltage; 2394 int i; 2395 2396 /* Currently requires operations to do this */ 2397 if (!ops->list_voltage || !ops->set_voltage_time_sel 2398 || !rdev->desc->n_voltages) 2399 return -EINVAL; 2400 2401 for (i = 0; i < rdev->desc->n_voltages; i++) { 2402 /* We only look for exact voltage matches here */ 2403 voltage = regulator_list_voltage(regulator, i); 2404 if (voltage < 0) 2405 return -EINVAL; 2406 if (voltage == 0) 2407 continue; 2408 if (voltage == old_uV) 2409 old_sel = i; 2410 if (voltage == new_uV) 2411 new_sel = i; 2412 } 2413 2414 if (old_sel < 0 || new_sel < 0) 2415 return -EINVAL; 2416 2417 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2418} 2419EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2420 2421/** 2422 * regulator_set_voltage_time_sel - get raise/fall time 2423 * @rdev: regulator source device 2424 * @old_selector: selector for starting voltage 2425 * @new_selector: selector for target voltage 2426 * 2427 * Provided with the starting and target voltage selectors, this function 2428 * returns time in microseconds required to rise or fall to this new voltage 2429 * 2430 * Drivers providing ramp_delay in regulation_constraints can use this as their 2431 * set_voltage_time_sel() operation. 2432 */ 2433int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2434 unsigned int old_selector, 2435 unsigned int new_selector) 2436{ 2437 unsigned int ramp_delay = 0; 2438 int old_volt, new_volt; 2439 2440 if (rdev->constraints->ramp_delay) 2441 ramp_delay = rdev->constraints->ramp_delay; 2442 else if (rdev->desc->ramp_delay) 2443 ramp_delay = rdev->desc->ramp_delay; 2444 2445 if (ramp_delay == 0) { 2446 rdev_warn(rdev, "ramp_delay not set\n"); 2447 return 0; 2448 } 2449 2450 /* sanity check */ 2451 if (!rdev->desc->ops->list_voltage) 2452 return -EINVAL; 2453 2454 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2455 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2456 2457 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2458} 2459EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2460 2461/** 2462 * regulator_sync_voltage - re-apply last regulator output voltage 2463 * @regulator: regulator source 2464 * 2465 * Re-apply the last configured voltage. This is intended to be used 2466 * where some external control source the consumer is cooperating with 2467 * has caused the configured voltage to change. 2468 */ 2469int regulator_sync_voltage(struct regulator *regulator) 2470{ 2471 struct regulator_dev *rdev = regulator->rdev; 2472 int ret, min_uV, max_uV; 2473 2474 mutex_lock(&rdev->mutex); 2475 2476 if (!rdev->desc->ops->set_voltage && 2477 !rdev->desc->ops->set_voltage_sel) { 2478 ret = -EINVAL; 2479 goto out; 2480 } 2481 2482 /* This is only going to work if we've had a voltage configured. */ 2483 if (!regulator->min_uV && !regulator->max_uV) { 2484 ret = -EINVAL; 2485 goto out; 2486 } 2487 2488 min_uV = regulator->min_uV; 2489 max_uV = regulator->max_uV; 2490 2491 /* This should be a paranoia check... */ 2492 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2493 if (ret < 0) 2494 goto out; 2495 2496 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2497 if (ret < 0) 2498 goto out; 2499 2500 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2501 2502out: 2503 mutex_unlock(&rdev->mutex); 2504 return ret; 2505} 2506EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2507 2508static int _regulator_get_voltage(struct regulator_dev *rdev) 2509{ 2510 int sel, ret; 2511 2512 if (rdev->desc->ops->get_voltage_sel) { 2513 sel = rdev->desc->ops->get_voltage_sel(rdev); 2514 if (sel < 0) 2515 return sel; 2516 ret = rdev->desc->ops->list_voltage(rdev, sel); 2517 } else if (rdev->desc->ops->get_voltage) { 2518 ret = rdev->desc->ops->get_voltage(rdev); 2519 } else if (rdev->desc->ops->list_voltage) { 2520 ret = rdev->desc->ops->list_voltage(rdev, 0); 2521 } else { 2522 return -EINVAL; 2523 } 2524 2525 if (ret < 0) 2526 return ret; 2527 return ret - rdev->constraints->uV_offset; 2528} 2529 2530/** 2531 * regulator_get_voltage - get regulator output voltage 2532 * @regulator: regulator source 2533 * 2534 * This returns the current regulator voltage in uV. 2535 * 2536 * NOTE: If the regulator is disabled it will return the voltage value. This 2537 * function should not be used to determine regulator state. 2538 */ 2539int regulator_get_voltage(struct regulator *regulator) 2540{ 2541 int ret; 2542 2543 mutex_lock(®ulator->rdev->mutex); 2544 2545 ret = _regulator_get_voltage(regulator->rdev); 2546 2547 mutex_unlock(®ulator->rdev->mutex); 2548 2549 return ret; 2550} 2551EXPORT_SYMBOL_GPL(regulator_get_voltage); 2552 2553/** 2554 * regulator_set_current_limit - set regulator output current limit 2555 * @regulator: regulator source 2556 * @min_uA: Minimum supported current in uA 2557 * @max_uA: Maximum supported current in uA 2558 * 2559 * Sets current sink to the desired output current. This can be set during 2560 * any regulator state. IOW, regulator can be disabled or enabled. 2561 * 2562 * If the regulator is enabled then the current will change to the new value 2563 * immediately otherwise if the regulator is disabled the regulator will 2564 * output at the new current when enabled. 2565 * 2566 * NOTE: Regulator system constraints must be set for this regulator before 2567 * calling this function otherwise this call will fail. 2568 */ 2569int regulator_set_current_limit(struct regulator *regulator, 2570 int min_uA, int max_uA) 2571{ 2572 struct regulator_dev *rdev = regulator->rdev; 2573 int ret; 2574 2575 mutex_lock(&rdev->mutex); 2576 2577 /* sanity check */ 2578 if (!rdev->desc->ops->set_current_limit) { 2579 ret = -EINVAL; 2580 goto out; 2581 } 2582 2583 /* constraints check */ 2584 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2585 if (ret < 0) 2586 goto out; 2587 2588 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2589out: 2590 mutex_unlock(&rdev->mutex); 2591 return ret; 2592} 2593EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2594 2595static int _regulator_get_current_limit(struct regulator_dev *rdev) 2596{ 2597 int ret; 2598 2599 mutex_lock(&rdev->mutex); 2600 2601 /* sanity check */ 2602 if (!rdev->desc->ops->get_current_limit) { 2603 ret = -EINVAL; 2604 goto out; 2605 } 2606 2607 ret = rdev->desc->ops->get_current_limit(rdev); 2608out: 2609 mutex_unlock(&rdev->mutex); 2610 return ret; 2611} 2612 2613/** 2614 * regulator_get_current_limit - get regulator output current 2615 * @regulator: regulator source 2616 * 2617 * This returns the current supplied by the specified current sink in uA. 2618 * 2619 * NOTE: If the regulator is disabled it will return the current value. This 2620 * function should not be used to determine regulator state. 2621 */ 2622int regulator_get_current_limit(struct regulator *regulator) 2623{ 2624 return _regulator_get_current_limit(regulator->rdev); 2625} 2626EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2627 2628/** 2629 * regulator_set_mode - set regulator operating mode 2630 * @regulator: regulator source 2631 * @mode: operating mode - one of the REGULATOR_MODE constants 2632 * 2633 * Set regulator operating mode to increase regulator efficiency or improve 2634 * regulation performance. 2635 * 2636 * NOTE: Regulator system constraints must be set for this regulator before 2637 * calling this function otherwise this call will fail. 2638 */ 2639int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2640{ 2641 struct regulator_dev *rdev = regulator->rdev; 2642 int ret; 2643 int regulator_curr_mode; 2644 2645 mutex_lock(&rdev->mutex); 2646 2647 /* sanity check */ 2648 if (!rdev->desc->ops->set_mode) { 2649 ret = -EINVAL; 2650 goto out; 2651 } 2652 2653 /* return if the same mode is requested */ 2654 if (rdev->desc->ops->get_mode) { 2655 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2656 if (regulator_curr_mode == mode) { 2657 ret = 0; 2658 goto out; 2659 } 2660 } 2661 2662 /* constraints check */ 2663 ret = regulator_mode_constrain(rdev, &mode); 2664 if (ret < 0) 2665 goto out; 2666 2667 ret = rdev->desc->ops->set_mode(rdev, mode); 2668out: 2669 mutex_unlock(&rdev->mutex); 2670 return ret; 2671} 2672EXPORT_SYMBOL_GPL(regulator_set_mode); 2673 2674static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2675{ 2676 int ret; 2677 2678 mutex_lock(&rdev->mutex); 2679 2680 /* sanity check */ 2681 if (!rdev->desc->ops->get_mode) { 2682 ret = -EINVAL; 2683 goto out; 2684 } 2685 2686 ret = rdev->desc->ops->get_mode(rdev); 2687out: 2688 mutex_unlock(&rdev->mutex); 2689 return ret; 2690} 2691 2692/** 2693 * regulator_get_mode - get regulator operating mode 2694 * @regulator: regulator source 2695 * 2696 * Get the current regulator operating mode. 2697 */ 2698unsigned int regulator_get_mode(struct regulator *regulator) 2699{ 2700 return _regulator_get_mode(regulator->rdev); 2701} 2702EXPORT_SYMBOL_GPL(regulator_get_mode); 2703 2704/** 2705 * regulator_set_optimum_mode - set regulator optimum operating mode 2706 * @regulator: regulator source 2707 * @uA_load: load current 2708 * 2709 * Notifies the regulator core of a new device load. This is then used by 2710 * DRMS (if enabled by constraints) to set the most efficient regulator 2711 * operating mode for the new regulator loading. 2712 * 2713 * Consumer devices notify their supply regulator of the maximum power 2714 * they will require (can be taken from device datasheet in the power 2715 * consumption tables) when they change operational status and hence power 2716 * state. Examples of operational state changes that can affect power 2717 * consumption are :- 2718 * 2719 * o Device is opened / closed. 2720 * o Device I/O is about to begin or has just finished. 2721 * o Device is idling in between work. 2722 * 2723 * This information is also exported via sysfs to userspace. 2724 * 2725 * DRMS will sum the total requested load on the regulator and change 2726 * to the most efficient operating mode if platform constraints allow. 2727 * 2728 * Returns the new regulator mode or error. 2729 */ 2730int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2731{ 2732 struct regulator_dev *rdev = regulator->rdev; 2733 struct regulator *consumer; 2734 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2735 unsigned int mode; 2736 2737 if (rdev->supply) 2738 input_uV = regulator_get_voltage(rdev->supply); 2739 2740 mutex_lock(&rdev->mutex); 2741 2742 /* 2743 * first check to see if we can set modes at all, otherwise just 2744 * tell the consumer everything is OK. 2745 */ 2746 regulator->uA_load = uA_load; 2747 ret = regulator_check_drms(rdev); 2748 if (ret < 0) { 2749 ret = 0; 2750 goto out; 2751 } 2752 2753 if (!rdev->desc->ops->get_optimum_mode) 2754 goto out; 2755 2756 /* 2757 * we can actually do this so any errors are indicators of 2758 * potential real failure. 2759 */ 2760 ret = -EINVAL; 2761 2762 if (!rdev->desc->ops->set_mode) 2763 goto out; 2764 2765 /* get output voltage */ 2766 output_uV = _regulator_get_voltage(rdev); 2767 if (output_uV <= 0) { 2768 rdev_err(rdev, "invalid output voltage found\n"); 2769 goto out; 2770 } 2771 2772 /* No supply? Use constraint voltage */ 2773 if (input_uV <= 0) 2774 input_uV = rdev->constraints->input_uV; 2775 if (input_uV <= 0) { 2776 rdev_err(rdev, "invalid input voltage found\n"); 2777 goto out; 2778 } 2779 2780 /* calc total requested load for this regulator */ 2781 list_for_each_entry(consumer, &rdev->consumer_list, list) 2782 total_uA_load += consumer->uA_load; 2783 2784 mode = rdev->desc->ops->get_optimum_mode(rdev, 2785 input_uV, output_uV, 2786 total_uA_load); 2787 ret = regulator_mode_constrain(rdev, &mode); 2788 if (ret < 0) { 2789 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2790 total_uA_load, input_uV, output_uV); 2791 goto out; 2792 } 2793 2794 ret = rdev->desc->ops->set_mode(rdev, mode); 2795 if (ret < 0) { 2796 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2797 goto out; 2798 } 2799 ret = mode; 2800out: 2801 mutex_unlock(&rdev->mutex); 2802 return ret; 2803} 2804EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2805 2806/** 2807 * regulator_allow_bypass - allow the regulator to go into bypass mode 2808 * 2809 * @regulator: Regulator to configure 2810 * @enable: enable or disable bypass mode 2811 * 2812 * Allow the regulator to go into bypass mode if all other consumers 2813 * for the regulator also enable bypass mode and the machine 2814 * constraints allow this. Bypass mode means that the regulator is 2815 * simply passing the input directly to the output with no regulation. 2816 */ 2817int regulator_allow_bypass(struct regulator *regulator, bool enable) 2818{ 2819 struct regulator_dev *rdev = regulator->rdev; 2820 int ret = 0; 2821 2822 if (!rdev->desc->ops->set_bypass) 2823 return 0; 2824 2825 if (rdev->constraints && 2826 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2827 return 0; 2828 2829 mutex_lock(&rdev->mutex); 2830 2831 if (enable && !regulator->bypass) { 2832 rdev->bypass_count++; 2833 2834 if (rdev->bypass_count == rdev->open_count) { 2835 ret = rdev->desc->ops->set_bypass(rdev, enable); 2836 if (ret != 0) 2837 rdev->bypass_count--; 2838 } 2839 2840 } else if (!enable && regulator->bypass) { 2841 rdev->bypass_count--; 2842 2843 if (rdev->bypass_count != rdev->open_count) { 2844 ret = rdev->desc->ops->set_bypass(rdev, enable); 2845 if (ret != 0) 2846 rdev->bypass_count++; 2847 } 2848 } 2849 2850 if (ret == 0) 2851 regulator->bypass = enable; 2852 2853 mutex_unlock(&rdev->mutex); 2854 2855 return ret; 2856} 2857EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2858 2859/** 2860 * regulator_register_notifier - register regulator event notifier 2861 * @regulator: regulator source 2862 * @nb: notifier block 2863 * 2864 * Register notifier block to receive regulator events. 2865 */ 2866int regulator_register_notifier(struct regulator *regulator, 2867 struct notifier_block *nb) 2868{ 2869 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2870 nb); 2871} 2872EXPORT_SYMBOL_GPL(regulator_register_notifier); 2873 2874/** 2875 * regulator_unregister_notifier - unregister regulator event notifier 2876 * @regulator: regulator source 2877 * @nb: notifier block 2878 * 2879 * Unregister regulator event notifier block. 2880 */ 2881int regulator_unregister_notifier(struct regulator *regulator, 2882 struct notifier_block *nb) 2883{ 2884 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2885 nb); 2886} 2887EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2888 2889/* notify regulator consumers and downstream regulator consumers. 2890 * Note mutex must be held by caller. 2891 */ 2892static void _notifier_call_chain(struct regulator_dev *rdev, 2893 unsigned long event, void *data) 2894{ 2895 /* call rdev chain first */ 2896 blocking_notifier_call_chain(&rdev->notifier, event, data); 2897} 2898 2899/** 2900 * regulator_bulk_get - get multiple regulator consumers 2901 * 2902 * @dev: Device to supply 2903 * @num_consumers: Number of consumers to register 2904 * @consumers: Configuration of consumers; clients are stored here. 2905 * 2906 * @return 0 on success, an errno on failure. 2907 * 2908 * This helper function allows drivers to get several regulator 2909 * consumers in one operation. If any of the regulators cannot be 2910 * acquired then any regulators that were allocated will be freed 2911 * before returning to the caller. 2912 */ 2913int regulator_bulk_get(struct device *dev, int num_consumers, 2914 struct regulator_bulk_data *consumers) 2915{ 2916 int i; 2917 int ret; 2918 2919 for (i = 0; i < num_consumers; i++) 2920 consumers[i].consumer = NULL; 2921 2922 for (i = 0; i < num_consumers; i++) { 2923 consumers[i].consumer = regulator_get(dev, 2924 consumers[i].supply); 2925 if (IS_ERR(consumers[i].consumer)) { 2926 ret = PTR_ERR(consumers[i].consumer); 2927 dev_err(dev, "Failed to get supply '%s': %d\n", 2928 consumers[i].supply, ret); 2929 consumers[i].consumer = NULL; 2930 goto err; 2931 } 2932 } 2933 2934 return 0; 2935 2936err: 2937 while (--i >= 0) 2938 regulator_put(consumers[i].consumer); 2939 2940 return ret; 2941} 2942EXPORT_SYMBOL_GPL(regulator_bulk_get); 2943 2944static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2945{ 2946 struct regulator_bulk_data *bulk = data; 2947 2948 bulk->ret = regulator_enable(bulk->consumer); 2949} 2950 2951/** 2952 * regulator_bulk_enable - enable multiple regulator consumers 2953 * 2954 * @num_consumers: Number of consumers 2955 * @consumers: Consumer data; clients are stored here. 2956 * @return 0 on success, an errno on failure 2957 * 2958 * This convenience API allows consumers to enable multiple regulator 2959 * clients in a single API call. If any consumers cannot be enabled 2960 * then any others that were enabled will be disabled again prior to 2961 * return. 2962 */ 2963int regulator_bulk_enable(int num_consumers, 2964 struct regulator_bulk_data *consumers) 2965{ 2966 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2967 int i; 2968 int ret = 0; 2969 2970 for (i = 0; i < num_consumers; i++) { 2971 if (consumers[i].consumer->always_on) 2972 consumers[i].ret = 0; 2973 else 2974 async_schedule_domain(regulator_bulk_enable_async, 2975 &consumers[i], &async_domain); 2976 } 2977 2978 async_synchronize_full_domain(&async_domain); 2979 2980 /* If any consumer failed we need to unwind any that succeeded */ 2981 for (i = 0; i < num_consumers; i++) { 2982 if (consumers[i].ret != 0) { 2983 ret = consumers[i].ret; 2984 goto err; 2985 } 2986 } 2987 2988 return 0; 2989 2990err: 2991 for (i = 0; i < num_consumers; i++) { 2992 if (consumers[i].ret < 0) 2993 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 2994 consumers[i].ret); 2995 else 2996 regulator_disable(consumers[i].consumer); 2997 } 2998 2999 return ret; 3000} 3001EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3002 3003/** 3004 * regulator_bulk_disable - disable multiple regulator consumers 3005 * 3006 * @num_consumers: Number of consumers 3007 * @consumers: Consumer data; clients are stored here. 3008 * @return 0 on success, an errno on failure 3009 * 3010 * This convenience API allows consumers to disable multiple regulator 3011 * clients in a single API call. If any consumers cannot be disabled 3012 * then any others that were disabled will be enabled again prior to 3013 * return. 3014 */ 3015int regulator_bulk_disable(int num_consumers, 3016 struct regulator_bulk_data *consumers) 3017{ 3018 int i; 3019 int ret, r; 3020 3021 for (i = num_consumers - 1; i >= 0; --i) { 3022 ret = regulator_disable(consumers[i].consumer); 3023 if (ret != 0) 3024 goto err; 3025 } 3026 3027 return 0; 3028 3029err: 3030 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3031 for (++i; i < num_consumers; ++i) { 3032 r = regulator_enable(consumers[i].consumer); 3033 if (r != 0) 3034 pr_err("Failed to reename %s: %d\n", 3035 consumers[i].supply, r); 3036 } 3037 3038 return ret; 3039} 3040EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3041 3042/** 3043 * regulator_bulk_force_disable - force disable multiple regulator consumers 3044 * 3045 * @num_consumers: Number of consumers 3046 * @consumers: Consumer data; clients are stored here. 3047 * @return 0 on success, an errno on failure 3048 * 3049 * This convenience API allows consumers to forcibly disable multiple regulator 3050 * clients in a single API call. 3051 * NOTE: This should be used for situations when device damage will 3052 * likely occur if the regulators are not disabled (e.g. over temp). 3053 * Although regulator_force_disable function call for some consumers can 3054 * return error numbers, the function is called for all consumers. 3055 */ 3056int regulator_bulk_force_disable(int num_consumers, 3057 struct regulator_bulk_data *consumers) 3058{ 3059 int i; 3060 int ret; 3061 3062 for (i = 0; i < num_consumers; i++) 3063 consumers[i].ret = 3064 regulator_force_disable(consumers[i].consumer); 3065 3066 for (i = 0; i < num_consumers; i++) { 3067 if (consumers[i].ret != 0) { 3068 ret = consumers[i].ret; 3069 goto out; 3070 } 3071 } 3072 3073 return 0; 3074out: 3075 return ret; 3076} 3077EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3078 3079/** 3080 * regulator_bulk_free - free multiple regulator consumers 3081 * 3082 * @num_consumers: Number of consumers 3083 * @consumers: Consumer data; clients are stored here. 3084 * 3085 * This convenience API allows consumers to free multiple regulator 3086 * clients in a single API call. 3087 */ 3088void regulator_bulk_free(int num_consumers, 3089 struct regulator_bulk_data *consumers) 3090{ 3091 int i; 3092 3093 for (i = 0; i < num_consumers; i++) { 3094 regulator_put(consumers[i].consumer); 3095 consumers[i].consumer = NULL; 3096 } 3097} 3098EXPORT_SYMBOL_GPL(regulator_bulk_free); 3099 3100/** 3101 * regulator_notifier_call_chain - call regulator event notifier 3102 * @rdev: regulator source 3103 * @event: notifier block 3104 * @data: callback-specific data. 3105 * 3106 * Called by regulator drivers to notify clients a regulator event has 3107 * occurred. We also notify regulator clients downstream. 3108 * Note lock must be held by caller. 3109 */ 3110int regulator_notifier_call_chain(struct regulator_dev *rdev, 3111 unsigned long event, void *data) 3112{ 3113 _notifier_call_chain(rdev, event, data); 3114 return NOTIFY_DONE; 3115 3116} 3117EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3118 3119/** 3120 * regulator_mode_to_status - convert a regulator mode into a status 3121 * 3122 * @mode: Mode to convert 3123 * 3124 * Convert a regulator mode into a status. 3125 */ 3126int regulator_mode_to_status(unsigned int mode) 3127{ 3128 switch (mode) { 3129 case REGULATOR_MODE_FAST: 3130 return REGULATOR_STATUS_FAST; 3131 case REGULATOR_MODE_NORMAL: 3132 return REGULATOR_STATUS_NORMAL; 3133 case REGULATOR_MODE_IDLE: 3134 return REGULATOR_STATUS_IDLE; 3135 case REGULATOR_MODE_STANDBY: 3136 return REGULATOR_STATUS_STANDBY; 3137 default: 3138 return REGULATOR_STATUS_UNDEFINED; 3139 } 3140} 3141EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3142 3143/* 3144 * To avoid cluttering sysfs (and memory) with useless state, only 3145 * create attributes that can be meaningfully displayed. 3146 */ 3147static int add_regulator_attributes(struct regulator_dev *rdev) 3148{ 3149 struct device *dev = &rdev->dev; 3150 struct regulator_ops *ops = rdev->desc->ops; 3151 int status = 0; 3152 3153 /* some attributes need specific methods to be displayed */ 3154 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3155 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3156 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3157 status = device_create_file(dev, &dev_attr_microvolts); 3158 if (status < 0) 3159 return status; 3160 } 3161 if (ops->get_current_limit) { 3162 status = device_create_file(dev, &dev_attr_microamps); 3163 if (status < 0) 3164 return status; 3165 } 3166 if (ops->get_mode) { 3167 status = device_create_file(dev, &dev_attr_opmode); 3168 if (status < 0) 3169 return status; 3170 } 3171 if (rdev->ena_pin || ops->is_enabled) { 3172 status = device_create_file(dev, &dev_attr_state); 3173 if (status < 0) 3174 return status; 3175 } 3176 if (ops->get_status) { 3177 status = device_create_file(dev, &dev_attr_status); 3178 if (status < 0) 3179 return status; 3180 } 3181 if (ops->get_bypass) { 3182 status = device_create_file(dev, &dev_attr_bypass); 3183 if (status < 0) 3184 return status; 3185 } 3186 3187 /* some attributes are type-specific */ 3188 if (rdev->desc->type == REGULATOR_CURRENT) { 3189 status = device_create_file(dev, &dev_attr_requested_microamps); 3190 if (status < 0) 3191 return status; 3192 } 3193 3194 /* all the other attributes exist to support constraints; 3195 * don't show them if there are no constraints, or if the 3196 * relevant supporting methods are missing. 3197 */ 3198 if (!rdev->constraints) 3199 return status; 3200 3201 /* constraints need specific supporting methods */ 3202 if (ops->set_voltage || ops->set_voltage_sel) { 3203 status = device_create_file(dev, &dev_attr_min_microvolts); 3204 if (status < 0) 3205 return status; 3206 status = device_create_file(dev, &dev_attr_max_microvolts); 3207 if (status < 0) 3208 return status; 3209 } 3210 if (ops->set_current_limit) { 3211 status = device_create_file(dev, &dev_attr_min_microamps); 3212 if (status < 0) 3213 return status; 3214 status = device_create_file(dev, &dev_attr_max_microamps); 3215 if (status < 0) 3216 return status; 3217 } 3218 3219 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3220 if (status < 0) 3221 return status; 3222 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3223 if (status < 0) 3224 return status; 3225 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3226 if (status < 0) 3227 return status; 3228 3229 if (ops->set_suspend_voltage) { 3230 status = device_create_file(dev, 3231 &dev_attr_suspend_standby_microvolts); 3232 if (status < 0) 3233 return status; 3234 status = device_create_file(dev, 3235 &dev_attr_suspend_mem_microvolts); 3236 if (status < 0) 3237 return status; 3238 status = device_create_file(dev, 3239 &dev_attr_suspend_disk_microvolts); 3240 if (status < 0) 3241 return status; 3242 } 3243 3244 if (ops->set_suspend_mode) { 3245 status = device_create_file(dev, 3246 &dev_attr_suspend_standby_mode); 3247 if (status < 0) 3248 return status; 3249 status = device_create_file(dev, 3250 &dev_attr_suspend_mem_mode); 3251 if (status < 0) 3252 return status; 3253 status = device_create_file(dev, 3254 &dev_attr_suspend_disk_mode); 3255 if (status < 0) 3256 return status; 3257 } 3258 3259 return status; 3260} 3261 3262static void rdev_init_debugfs(struct regulator_dev *rdev) 3263{ 3264 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3265 if (!rdev->debugfs) { 3266 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3267 return; 3268 } 3269 3270 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3271 &rdev->use_count); 3272 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3273 &rdev->open_count); 3274 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3275 &rdev->bypass_count); 3276} 3277 3278/** 3279 * regulator_register - register regulator 3280 * @regulator_desc: regulator to register 3281 * @config: runtime configuration for regulator 3282 * 3283 * Called by regulator drivers to register a regulator. 3284 * Returns a valid pointer to struct regulator_dev on success 3285 * or an ERR_PTR() on error. 3286 */ 3287struct regulator_dev * 3288regulator_register(const struct regulator_desc *regulator_desc, 3289 const struct regulator_config *config) 3290{ 3291 const struct regulation_constraints *constraints = NULL; 3292 const struct regulator_init_data *init_data; 3293 static atomic_t regulator_no = ATOMIC_INIT(0); 3294 struct regulator_dev *rdev; 3295 struct device *dev; 3296 int ret, i; 3297 const char *supply = NULL; 3298 3299 if (regulator_desc == NULL || config == NULL) 3300 return ERR_PTR(-EINVAL); 3301 3302 dev = config->dev; 3303 WARN_ON(!dev); 3304 3305 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3306 return ERR_PTR(-EINVAL); 3307 3308 if (regulator_desc->type != REGULATOR_VOLTAGE && 3309 regulator_desc->type != REGULATOR_CURRENT) 3310 return ERR_PTR(-EINVAL); 3311 3312 /* Only one of each should be implemented */ 3313 WARN_ON(regulator_desc->ops->get_voltage && 3314 regulator_desc->ops->get_voltage_sel); 3315 WARN_ON(regulator_desc->ops->set_voltage && 3316 regulator_desc->ops->set_voltage_sel); 3317 3318 /* If we're using selectors we must implement list_voltage. */ 3319 if (regulator_desc->ops->get_voltage_sel && 3320 !regulator_desc->ops->list_voltage) { 3321 return ERR_PTR(-EINVAL); 3322 } 3323 if (regulator_desc->ops->set_voltage_sel && 3324 !regulator_desc->ops->list_voltage) { 3325 return ERR_PTR(-EINVAL); 3326 } 3327 3328 init_data = config->init_data; 3329 3330 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3331 if (rdev == NULL) 3332 return ERR_PTR(-ENOMEM); 3333 3334 mutex_lock(®ulator_list_mutex); 3335 3336 mutex_init(&rdev->mutex); 3337 rdev->reg_data = config->driver_data; 3338 rdev->owner = regulator_desc->owner; 3339 rdev->desc = regulator_desc; 3340 if (config->regmap) 3341 rdev->regmap = config->regmap; 3342 else if (dev_get_regmap(dev, NULL)) 3343 rdev->regmap = dev_get_regmap(dev, NULL); 3344 else if (dev->parent) 3345 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3346 INIT_LIST_HEAD(&rdev->consumer_list); 3347 INIT_LIST_HEAD(&rdev->list); 3348 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3349 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3350 3351 /* preform any regulator specific init */ 3352 if (init_data && init_data->regulator_init) { 3353 ret = init_data->regulator_init(rdev->reg_data); 3354 if (ret < 0) 3355 goto clean; 3356 } 3357 3358 /* register with sysfs */ 3359 rdev->dev.class = ®ulator_class; 3360 rdev->dev.of_node = config->of_node; 3361 rdev->dev.parent = dev; 3362 dev_set_name(&rdev->dev, "regulator.%d", 3363 atomic_inc_return(®ulator_no) - 1); 3364 ret = device_register(&rdev->dev); 3365 if (ret != 0) { 3366 put_device(&rdev->dev); 3367 goto clean; 3368 } 3369 3370 dev_set_drvdata(&rdev->dev, rdev); 3371 3372 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3373 ret = regulator_ena_gpio_request(rdev, config); 3374 if (ret != 0) { 3375 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3376 config->ena_gpio, ret); 3377 goto wash; 3378 } 3379 3380 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3381 rdev->ena_gpio_state = 1; 3382 3383 if (config->ena_gpio_invert) 3384 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3385 } 3386 3387 /* set regulator constraints */ 3388 if (init_data) 3389 constraints = &init_data->constraints; 3390 3391 ret = set_machine_constraints(rdev, constraints); 3392 if (ret < 0) 3393 goto scrub; 3394 3395 /* add attributes supported by this regulator */ 3396 ret = add_regulator_attributes(rdev); 3397 if (ret < 0) 3398 goto scrub; 3399 3400 if (init_data && init_data->supply_regulator) 3401 supply = init_data->supply_regulator; 3402 else if (regulator_desc->supply_name) 3403 supply = regulator_desc->supply_name; 3404 3405 if (supply) { 3406 struct regulator_dev *r; 3407 3408 r = regulator_dev_lookup(dev, supply, &ret); 3409 3410 if (ret == -ENODEV) { 3411 /* 3412 * No supply was specified for this regulator and 3413 * there will never be one. 3414 */ 3415 ret = 0; 3416 goto add_dev; 3417 } else if (!r) { 3418 dev_err(dev, "Failed to find supply %s\n", supply); 3419 ret = -EPROBE_DEFER; 3420 goto scrub; 3421 } 3422 3423 ret = set_supply(rdev, r); 3424 if (ret < 0) 3425 goto scrub; 3426 3427 /* Enable supply if rail is enabled */ 3428 if (_regulator_is_enabled(rdev)) { 3429 ret = regulator_enable(rdev->supply); 3430 if (ret < 0) 3431 goto scrub; 3432 } 3433 } 3434 3435add_dev: 3436 /* add consumers devices */ 3437 if (init_data) { 3438 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3439 ret = set_consumer_device_supply(rdev, 3440 init_data->consumer_supplies[i].dev_name, 3441 init_data->consumer_supplies[i].supply); 3442 if (ret < 0) { 3443 dev_err(dev, "Failed to set supply %s\n", 3444 init_data->consumer_supplies[i].supply); 3445 goto unset_supplies; 3446 } 3447 } 3448 } 3449 3450 list_add(&rdev->list, ®ulator_list); 3451 3452 rdev_init_debugfs(rdev); 3453out: 3454 mutex_unlock(®ulator_list_mutex); 3455 return rdev; 3456 3457unset_supplies: 3458 unset_regulator_supplies(rdev); 3459 3460scrub: 3461 if (rdev->supply) 3462 _regulator_put(rdev->supply); 3463 regulator_ena_gpio_free(rdev); 3464 kfree(rdev->constraints); 3465wash: 3466 device_unregister(&rdev->dev); 3467 /* device core frees rdev */ 3468 rdev = ERR_PTR(ret); 3469 goto out; 3470 3471clean: 3472 kfree(rdev); 3473 rdev = ERR_PTR(ret); 3474 goto out; 3475} 3476EXPORT_SYMBOL_GPL(regulator_register); 3477 3478/** 3479 * regulator_unregister - unregister regulator 3480 * @rdev: regulator to unregister 3481 * 3482 * Called by regulator drivers to unregister a regulator. 3483 */ 3484void regulator_unregister(struct regulator_dev *rdev) 3485{ 3486 if (rdev == NULL) 3487 return; 3488 3489 if (rdev->supply) { 3490 while (rdev->use_count--) 3491 regulator_disable(rdev->supply); 3492 regulator_put(rdev->supply); 3493 } 3494 mutex_lock(®ulator_list_mutex); 3495 debugfs_remove_recursive(rdev->debugfs); 3496 flush_work(&rdev->disable_work.work); 3497 WARN_ON(rdev->open_count); 3498 unset_regulator_supplies(rdev); 3499 list_del(&rdev->list); 3500 kfree(rdev->constraints); 3501 regulator_ena_gpio_free(rdev); 3502 device_unregister(&rdev->dev); 3503 mutex_unlock(®ulator_list_mutex); 3504} 3505EXPORT_SYMBOL_GPL(regulator_unregister); 3506 3507/** 3508 * regulator_suspend_prepare - prepare regulators for system wide suspend 3509 * @state: system suspend state 3510 * 3511 * Configure each regulator with it's suspend operating parameters for state. 3512 * This will usually be called by machine suspend code prior to supending. 3513 */ 3514int regulator_suspend_prepare(suspend_state_t state) 3515{ 3516 struct regulator_dev *rdev; 3517 int ret = 0; 3518 3519 /* ON is handled by regulator active state */ 3520 if (state == PM_SUSPEND_ON) 3521 return -EINVAL; 3522 3523 mutex_lock(®ulator_list_mutex); 3524 list_for_each_entry(rdev, ®ulator_list, list) { 3525 3526 mutex_lock(&rdev->mutex); 3527 ret = suspend_prepare(rdev, state); 3528 mutex_unlock(&rdev->mutex); 3529 3530 if (ret < 0) { 3531 rdev_err(rdev, "failed to prepare\n"); 3532 goto out; 3533 } 3534 } 3535out: 3536 mutex_unlock(®ulator_list_mutex); 3537 return ret; 3538} 3539EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3540 3541/** 3542 * regulator_suspend_finish - resume regulators from system wide suspend 3543 * 3544 * Turn on regulators that might be turned off by regulator_suspend_prepare 3545 * and that should be turned on according to the regulators properties. 3546 */ 3547int regulator_suspend_finish(void) 3548{ 3549 struct regulator_dev *rdev; 3550 int ret = 0, error; 3551 3552 mutex_lock(®ulator_list_mutex); 3553 list_for_each_entry(rdev, ®ulator_list, list) { 3554 struct regulator_ops *ops = rdev->desc->ops; 3555 3556 mutex_lock(&rdev->mutex); 3557 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3558 ops->enable) { 3559 error = ops->enable(rdev); 3560 if (error) 3561 ret = error; 3562 } else { 3563 if (!has_full_constraints) 3564 goto unlock; 3565 if (!ops->disable) 3566 goto unlock; 3567 if (!_regulator_is_enabled(rdev)) 3568 goto unlock; 3569 3570 error = ops->disable(rdev); 3571 if (error) 3572 ret = error; 3573 } 3574unlock: 3575 mutex_unlock(&rdev->mutex); 3576 } 3577 mutex_unlock(®ulator_list_mutex); 3578 return ret; 3579} 3580EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3581 3582/** 3583 * regulator_has_full_constraints - the system has fully specified constraints 3584 * 3585 * Calling this function will cause the regulator API to disable all 3586 * regulators which have a zero use count and don't have an always_on 3587 * constraint in a late_initcall. 3588 * 3589 * The intention is that this will become the default behaviour in a 3590 * future kernel release so users are encouraged to use this facility 3591 * now. 3592 */ 3593void regulator_has_full_constraints(void) 3594{ 3595 has_full_constraints = 1; 3596} 3597EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3598 3599/** 3600 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3601 * 3602 * Calling this function will cause the regulator API to provide a 3603 * dummy regulator to consumers if no physical regulator is found, 3604 * allowing most consumers to proceed as though a regulator were 3605 * configured. This allows systems such as those with software 3606 * controllable regulators for the CPU core only to be brought up more 3607 * readily. 3608 */ 3609void regulator_use_dummy_regulator(void) 3610{ 3611 board_wants_dummy_regulator = true; 3612} 3613EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3614 3615/** 3616 * rdev_get_drvdata - get rdev regulator driver data 3617 * @rdev: regulator 3618 * 3619 * Get rdev regulator driver private data. This call can be used in the 3620 * regulator driver context. 3621 */ 3622void *rdev_get_drvdata(struct regulator_dev *rdev) 3623{ 3624 return rdev->reg_data; 3625} 3626EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3627 3628/** 3629 * regulator_get_drvdata - get regulator driver data 3630 * @regulator: regulator 3631 * 3632 * Get regulator driver private data. This call can be used in the consumer 3633 * driver context when non API regulator specific functions need to be called. 3634 */ 3635void *regulator_get_drvdata(struct regulator *regulator) 3636{ 3637 return regulator->rdev->reg_data; 3638} 3639EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3640 3641/** 3642 * regulator_set_drvdata - set regulator driver data 3643 * @regulator: regulator 3644 * @data: data 3645 */ 3646void regulator_set_drvdata(struct regulator *regulator, void *data) 3647{ 3648 regulator->rdev->reg_data = data; 3649} 3650EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3651 3652/** 3653 * regulator_get_id - get regulator ID 3654 * @rdev: regulator 3655 */ 3656int rdev_get_id(struct regulator_dev *rdev) 3657{ 3658 return rdev->desc->id; 3659} 3660EXPORT_SYMBOL_GPL(rdev_get_id); 3661 3662struct device *rdev_get_dev(struct regulator_dev *rdev) 3663{ 3664 return &rdev->dev; 3665} 3666EXPORT_SYMBOL_GPL(rdev_get_dev); 3667 3668void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3669{ 3670 return reg_init_data->driver_data; 3671} 3672EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3673 3674#ifdef CONFIG_DEBUG_FS 3675static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3676 size_t count, loff_t *ppos) 3677{ 3678 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3679 ssize_t len, ret = 0; 3680 struct regulator_map *map; 3681 3682 if (!buf) 3683 return -ENOMEM; 3684 3685 list_for_each_entry(map, ®ulator_map_list, list) { 3686 len = snprintf(buf + ret, PAGE_SIZE - ret, 3687 "%s -> %s.%s\n", 3688 rdev_get_name(map->regulator), map->dev_name, 3689 map->supply); 3690 if (len >= 0) 3691 ret += len; 3692 if (ret > PAGE_SIZE) { 3693 ret = PAGE_SIZE; 3694 break; 3695 } 3696 } 3697 3698 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3699 3700 kfree(buf); 3701 3702 return ret; 3703} 3704#endif 3705 3706static const struct file_operations supply_map_fops = { 3707#ifdef CONFIG_DEBUG_FS 3708 .read = supply_map_read_file, 3709 .llseek = default_llseek, 3710#endif 3711}; 3712 3713static int __init regulator_init(void) 3714{ 3715 int ret; 3716 3717 ret = class_register(®ulator_class); 3718 3719 debugfs_root = debugfs_create_dir("regulator", NULL); 3720 if (!debugfs_root) 3721 pr_warn("regulator: Failed to create debugfs directory\n"); 3722 3723 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3724 &supply_map_fops); 3725 3726 regulator_dummy_init(); 3727 3728 return ret; 3729} 3730 3731/* init early to allow our consumers to complete system booting */ 3732core_initcall(regulator_init); 3733 3734static int __init regulator_init_complete(void) 3735{ 3736 struct regulator_dev *rdev; 3737 struct regulator_ops *ops; 3738 struct regulation_constraints *c; 3739 int enabled, ret; 3740 3741 /* 3742 * Since DT doesn't provide an idiomatic mechanism for 3743 * enabling full constraints and since it's much more natural 3744 * with DT to provide them just assume that a DT enabled 3745 * system has full constraints. 3746 */ 3747 if (of_have_populated_dt()) 3748 has_full_constraints = true; 3749 3750 mutex_lock(®ulator_list_mutex); 3751 3752 /* If we have a full configuration then disable any regulators 3753 * which are not in use or always_on. This will become the 3754 * default behaviour in the future. 3755 */ 3756 list_for_each_entry(rdev, ®ulator_list, list) { 3757 ops = rdev->desc->ops; 3758 c = rdev->constraints; 3759 3760 if (!ops->disable || (c && c->always_on)) 3761 continue; 3762 3763 mutex_lock(&rdev->mutex); 3764 3765 if (rdev->use_count) 3766 goto unlock; 3767 3768 /* If we can't read the status assume it's on. */ 3769 if (ops->is_enabled) 3770 enabled = ops->is_enabled(rdev); 3771 else 3772 enabled = 1; 3773 3774 if (!enabled) 3775 goto unlock; 3776 3777 if (has_full_constraints) { 3778 /* We log since this may kill the system if it 3779 * goes wrong. */ 3780 rdev_info(rdev, "disabling\n"); 3781 ret = ops->disable(rdev); 3782 if (ret != 0) { 3783 rdev_err(rdev, "couldn't disable: %d\n", ret); 3784 } 3785 } else { 3786 /* The intention is that in future we will 3787 * assume that full constraints are provided 3788 * so warn even if we aren't going to do 3789 * anything here. 3790 */ 3791 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3792 } 3793 3794unlock: 3795 mutex_unlock(&rdev->mutex); 3796 } 3797 3798 mutex_unlock(®ulator_list_mutex); 3799 3800 return 0; 3801} 3802late_initcall(regulator_init_complete); 3803