core.c revision 69d588392b057c0cedb1ba58d7973b77a65997ec
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; 58 59static struct dentry *debugfs_root; 60 61/* 62 * struct regulator_map 63 * 64 * Used to provide symbolic supply names to devices. 65 */ 66struct regulator_map { 67 struct list_head list; 68 const char *dev_name; /* The dev_name() for the consumer */ 69 const char *supply; 70 struct regulator_dev *regulator; 71}; 72 73/* 74 * struct regulator_enable_gpio 75 * 76 * Management for shared enable GPIO pin 77 */ 78struct regulator_enable_gpio { 79 struct list_head list; 80 int gpio; 81 u32 enable_count; /* a number of enabled shared GPIO */ 82 u32 request_count; /* a number of requested shared GPIO */ 83 unsigned int ena_gpio_invert:1; 84}; 85 86/* 87 * struct regulator_supply_alias 88 * 89 * Used to map lookups for a supply onto an alternative device. 90 */ 91struct regulator_supply_alias { 92 struct list_head list; 93 struct device *src_dev; 94 const char *src_supply; 95 struct device *alias_dev; 96 const char *alias_supply; 97}; 98 99static int _regulator_is_enabled(struct regulator_dev *rdev); 100static int _regulator_disable(struct regulator_dev *rdev); 101static int _regulator_get_voltage(struct regulator_dev *rdev); 102static int _regulator_get_current_limit(struct regulator_dev *rdev); 103static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 104static void _notifier_call_chain(struct regulator_dev *rdev, 105 unsigned long event, void *data); 106static int _regulator_do_set_voltage(struct regulator_dev *rdev, 107 int min_uV, int max_uV); 108static struct regulator *create_regulator(struct regulator_dev *rdev, 109 struct device *dev, 110 const char *supply_name); 111 112static const char *rdev_get_name(struct regulator_dev *rdev) 113{ 114 if (rdev->constraints && rdev->constraints->name) 115 return rdev->constraints->name; 116 else if (rdev->desc->name) 117 return rdev->desc->name; 118 else 119 return ""; 120} 121 122static bool have_full_constraints(void) 123{ 124 return has_full_constraints || of_have_populated_dt(); 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t name_show(struct device *dev, struct device_attribute *attr, 327 char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333static DEVICE_ATTR_RO(name); 334 335static ssize_t regulator_print_opmode(char *buf, int mode) 336{ 337 switch (mode) { 338 case REGULATOR_MODE_FAST: 339 return sprintf(buf, "fast\n"); 340 case REGULATOR_MODE_NORMAL: 341 return sprintf(buf, "normal\n"); 342 case REGULATOR_MODE_IDLE: 343 return sprintf(buf, "idle\n"); 344 case REGULATOR_MODE_STANDBY: 345 return sprintf(buf, "standby\n"); 346 } 347 return sprintf(buf, "unknown\n"); 348} 349 350static ssize_t regulator_opmode_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352{ 353 struct regulator_dev *rdev = dev_get_drvdata(dev); 354 355 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 356} 357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 358 359static ssize_t regulator_print_state(char *buf, int state) 360{ 361 if (state > 0) 362 return sprintf(buf, "enabled\n"); 363 else if (state == 0) 364 return sprintf(buf, "disabled\n"); 365 else 366 return sprintf(buf, "unknown\n"); 367} 368 369static ssize_t regulator_state_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct regulator_dev *rdev = dev_get_drvdata(dev); 373 ssize_t ret; 374 375 mutex_lock(&rdev->mutex); 376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 377 mutex_unlock(&rdev->mutex); 378 379 return ret; 380} 381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 382 383static ssize_t regulator_status_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 int status; 388 char *label; 389 390 status = rdev->desc->ops->get_status(rdev); 391 if (status < 0) 392 return status; 393 394 switch (status) { 395 case REGULATOR_STATUS_OFF: 396 label = "off"; 397 break; 398 case REGULATOR_STATUS_ON: 399 label = "on"; 400 break; 401 case REGULATOR_STATUS_ERROR: 402 label = "error"; 403 break; 404 case REGULATOR_STATUS_FAST: 405 label = "fast"; 406 break; 407 case REGULATOR_STATUS_NORMAL: 408 label = "normal"; 409 break; 410 case REGULATOR_STATUS_IDLE: 411 label = "idle"; 412 break; 413 case REGULATOR_STATUS_STANDBY: 414 label = "standby"; 415 break; 416 case REGULATOR_STATUS_BYPASS: 417 label = "bypass"; 418 break; 419 case REGULATOR_STATUS_UNDEFINED: 420 label = "undefined"; 421 break; 422 default: 423 return -ERANGE; 424 } 425 426 return sprintf(buf, "%s\n", label); 427} 428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 429 430static ssize_t regulator_min_uA_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432{ 433 struct regulator_dev *rdev = dev_get_drvdata(dev); 434 435 if (!rdev->constraints) 436 return sprintf(buf, "constraint not defined\n"); 437 438 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 439} 440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 441 442static ssize_t regulator_max_uA_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 if (!rdev->constraints) 448 return sprintf(buf, "constraint not defined\n"); 449 450 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 451} 452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 453 454static ssize_t regulator_min_uV_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 if (!rdev->constraints) 460 return sprintf(buf, "constraint not defined\n"); 461 462 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 463} 464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 465 466static ssize_t regulator_max_uV_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468{ 469 struct regulator_dev *rdev = dev_get_drvdata(dev); 470 471 if (!rdev->constraints) 472 return sprintf(buf, "constraint not defined\n"); 473 474 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 475} 476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 477 478static ssize_t regulator_total_uA_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 struct regulator *regulator; 483 int uA = 0; 484 485 mutex_lock(&rdev->mutex); 486 list_for_each_entry(regulator, &rdev->consumer_list, list) 487 uA += regulator->uA_load; 488 mutex_unlock(&rdev->mutex); 489 return sprintf(buf, "%d\n", uA); 490} 491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 492 493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 494 char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 return sprintf(buf, "%d\n", rdev->use_count); 498} 499static DEVICE_ATTR_RO(num_users); 500 501static ssize_t type_show(struct device *dev, struct device_attribute *attr, 502 char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514static DEVICE_ATTR_RO(type); 515 516static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 522} 523static DEVICE_ATTR(suspend_mem_microvolts, 0444, 524 regulator_suspend_mem_uV_show, NULL); 525 526static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 532} 533static DEVICE_ATTR(suspend_disk_microvolts, 0444, 534 regulator_suspend_disk_uV_show, NULL); 535 536static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 struct regulator_dev *rdev = dev_get_drvdata(dev); 540 541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 542} 543static DEVICE_ATTR(suspend_standby_microvolts, 0444, 544 regulator_suspend_standby_uV_show, NULL); 545 546static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 547 struct device_attribute *attr, char *buf) 548{ 549 struct regulator_dev *rdev = dev_get_drvdata(dev); 550 551 return regulator_print_opmode(buf, 552 rdev->constraints->state_mem.mode); 553} 554static DEVICE_ATTR(suspend_mem_mode, 0444, 555 regulator_suspend_mem_mode_show, NULL); 556 557static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 558 struct device_attribute *attr, char *buf) 559{ 560 struct regulator_dev *rdev = dev_get_drvdata(dev); 561 562 return regulator_print_opmode(buf, 563 rdev->constraints->state_disk.mode); 564} 565static DEVICE_ATTR(suspend_disk_mode, 0444, 566 regulator_suspend_disk_mode_show, NULL); 567 568static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 569 struct device_attribute *attr, char *buf) 570{ 571 struct regulator_dev *rdev = dev_get_drvdata(dev); 572 573 return regulator_print_opmode(buf, 574 rdev->constraints->state_standby.mode); 575} 576static DEVICE_ATTR(suspend_standby_mode, 0444, 577 regulator_suspend_standby_mode_show, NULL); 578 579static ssize_t regulator_suspend_mem_state_show(struct device *dev, 580 struct device_attribute *attr, char *buf) 581{ 582 struct regulator_dev *rdev = dev_get_drvdata(dev); 583 584 return regulator_print_state(buf, 585 rdev->constraints->state_mem.enabled); 586} 587static DEVICE_ATTR(suspend_mem_state, 0444, 588 regulator_suspend_mem_state_show, NULL); 589 590static ssize_t regulator_suspend_disk_state_show(struct device *dev, 591 struct device_attribute *attr, char *buf) 592{ 593 struct regulator_dev *rdev = dev_get_drvdata(dev); 594 595 return regulator_print_state(buf, 596 rdev->constraints->state_disk.enabled); 597} 598static DEVICE_ATTR(suspend_disk_state, 0444, 599 regulator_suspend_disk_state_show, NULL); 600 601static ssize_t regulator_suspend_standby_state_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603{ 604 struct regulator_dev *rdev = dev_get_drvdata(dev); 605 606 return regulator_print_state(buf, 607 rdev->constraints->state_standby.enabled); 608} 609static DEVICE_ATTR(suspend_standby_state, 0444, 610 regulator_suspend_standby_state_show, NULL); 611 612static ssize_t regulator_bypass_show(struct device *dev, 613 struct device_attribute *attr, char *buf) 614{ 615 struct regulator_dev *rdev = dev_get_drvdata(dev); 616 const char *report; 617 bool bypass; 618 int ret; 619 620 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 621 622 if (ret != 0) 623 report = "unknown"; 624 else if (bypass) 625 report = "enabled"; 626 else 627 report = "disabled"; 628 629 return sprintf(buf, "%s\n", report); 630} 631static DEVICE_ATTR(bypass, 0444, 632 regulator_bypass_show, NULL); 633 634/* 635 * These are the only attributes are present for all regulators. 636 * Other attributes are a function of regulator functionality. 637 */ 638static struct attribute *regulator_dev_attrs[] = { 639 &dev_attr_name.attr, 640 &dev_attr_num_users.attr, 641 &dev_attr_type.attr, 642 NULL, 643}; 644ATTRIBUTE_GROUPS(regulator_dev); 645 646static void regulator_dev_release(struct device *dev) 647{ 648 struct regulator_dev *rdev = dev_get_drvdata(dev); 649 kfree(rdev); 650} 651 652static struct class regulator_class = { 653 .name = "regulator", 654 .dev_release = regulator_dev_release, 655 .dev_groups = regulator_dev_groups, 656}; 657 658/* Calculate the new optimum regulator operating mode based on the new total 659 * consumer load. All locks held by caller */ 660static void drms_uA_update(struct regulator_dev *rdev) 661{ 662 struct regulator *sibling; 663 int current_uA = 0, output_uV, input_uV, err; 664 unsigned int mode; 665 666 err = regulator_check_drms(rdev); 667 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 668 (!rdev->desc->ops->get_voltage && 669 !rdev->desc->ops->get_voltage_sel) || 670 !rdev->desc->ops->set_mode) 671 return; 672 673 /* get output voltage */ 674 output_uV = _regulator_get_voltage(rdev); 675 if (output_uV <= 0) 676 return; 677 678 /* get input voltage */ 679 input_uV = 0; 680 if (rdev->supply) 681 input_uV = regulator_get_voltage(rdev->supply); 682 if (input_uV <= 0) 683 input_uV = rdev->constraints->input_uV; 684 if (input_uV <= 0) 685 return; 686 687 /* calc total requested load */ 688 list_for_each_entry(sibling, &rdev->consumer_list, list) 689 current_uA += sibling->uA_load; 690 691 /* now get the optimum mode for our new total regulator load */ 692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 693 output_uV, current_uA); 694 695 /* check the new mode is allowed */ 696 err = regulator_mode_constrain(rdev, &mode); 697 if (err == 0) 698 rdev->desc->ops->set_mode(rdev, mode); 699} 700 701static int suspend_set_state(struct regulator_dev *rdev, 702 struct regulator_state *rstate) 703{ 704 int ret = 0; 705 706 /* If we have no suspend mode configration don't set anything; 707 * only warn if the driver implements set_suspend_voltage or 708 * set_suspend_mode callback. 709 */ 710 if (!rstate->enabled && !rstate->disabled) { 711 if (rdev->desc->ops->set_suspend_voltage || 712 rdev->desc->ops->set_suspend_mode) 713 rdev_warn(rdev, "No configuration\n"); 714 return 0; 715 } 716 717 if (rstate->enabled && rstate->disabled) { 718 rdev_err(rdev, "invalid configuration\n"); 719 return -EINVAL; 720 } 721 722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 723 ret = rdev->desc->ops->set_suspend_enable(rdev); 724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 725 ret = rdev->desc->ops->set_suspend_disable(rdev); 726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 727 ret = 0; 728 729 if (ret < 0) { 730 rdev_err(rdev, "failed to enabled/disable\n"); 731 return ret; 732 } 733 734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 736 if (ret < 0) { 737 rdev_err(rdev, "failed to set voltage\n"); 738 return ret; 739 } 740 } 741 742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 744 if (ret < 0) { 745 rdev_err(rdev, "failed to set mode\n"); 746 return ret; 747 } 748 } 749 return ret; 750} 751 752/* locks held by caller */ 753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 754{ 755 if (!rdev->constraints) 756 return -EINVAL; 757 758 switch (state) { 759 case PM_SUSPEND_STANDBY: 760 return suspend_set_state(rdev, 761 &rdev->constraints->state_standby); 762 case PM_SUSPEND_MEM: 763 return suspend_set_state(rdev, 764 &rdev->constraints->state_mem); 765 case PM_SUSPEND_MAX: 766 return suspend_set_state(rdev, 767 &rdev->constraints->state_disk); 768 default: 769 return -EINVAL; 770 } 771} 772 773static void print_constraints(struct regulator_dev *rdev) 774{ 775 struct regulation_constraints *constraints = rdev->constraints; 776 char buf[80] = ""; 777 int count = 0; 778 int ret; 779 780 if (constraints->min_uV && constraints->max_uV) { 781 if (constraints->min_uV == constraints->max_uV) 782 count += sprintf(buf + count, "%d mV ", 783 constraints->min_uV / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mV ", 786 constraints->min_uV / 1000, 787 constraints->max_uV / 1000); 788 } 789 790 if (!constraints->min_uV || 791 constraints->min_uV != constraints->max_uV) { 792 ret = _regulator_get_voltage(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mV ", ret / 1000); 795 } 796 797 if (constraints->uV_offset) 798 count += sprintf(buf, "%dmV offset ", 799 constraints->uV_offset / 1000); 800 801 if (constraints->min_uA && constraints->max_uA) { 802 if (constraints->min_uA == constraints->max_uA) 803 count += sprintf(buf + count, "%d mA ", 804 constraints->min_uA / 1000); 805 else 806 count += sprintf(buf + count, "%d <--> %d mA ", 807 constraints->min_uA / 1000, 808 constraints->max_uA / 1000); 809 } 810 811 if (!constraints->min_uA || 812 constraints->min_uA != constraints->max_uA) { 813 ret = _regulator_get_current_limit(rdev); 814 if (ret > 0) 815 count += sprintf(buf + count, "at %d mA ", ret / 1000); 816 } 817 818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 819 count += sprintf(buf + count, "fast "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 821 count += sprintf(buf + count, "normal "); 822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 823 count += sprintf(buf + count, "idle "); 824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 825 count += sprintf(buf + count, "standby"); 826 827 if (!count) 828 sprintf(buf, "no parameters"); 829 830 rdev_info(rdev, "%s\n", buf); 831 832 if ((constraints->min_uV != constraints->max_uV) && 833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 834 rdev_warn(rdev, 835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 836} 837 838static int machine_constraints_voltage(struct regulator_dev *rdev, 839 struct regulation_constraints *constraints) 840{ 841 struct regulator_ops *ops = rdev->desc->ops; 842 int ret; 843 844 /* do we need to apply the constraint voltage */ 845 if (rdev->constraints->apply_uV && 846 rdev->constraints->min_uV == rdev->constraints->max_uV) { 847 int current_uV = _regulator_get_voltage(rdev); 848 if (current_uV < 0) { 849 rdev_err(rdev, 850 "failed to get the current voltage(%d)\n", 851 current_uV); 852 return current_uV; 853 } 854 if (current_uV < rdev->constraints->min_uV || 855 current_uV > rdev->constraints->max_uV) { 856 ret = _regulator_do_set_voltage( 857 rdev, rdev->constraints->min_uV, 858 rdev->constraints->max_uV); 859 if (ret < 0) { 860 rdev_err(rdev, 861 "failed to apply %duV constraint(%d)\n", 862 rdev->constraints->min_uV, ret); 863 return ret; 864 } 865 } 866 } 867 868 /* constrain machine-level voltage specs to fit 869 * the actual range supported by this regulator. 870 */ 871 if (ops->list_voltage && rdev->desc->n_voltages) { 872 int count = rdev->desc->n_voltages; 873 int i; 874 int min_uV = INT_MAX; 875 int max_uV = INT_MIN; 876 int cmin = constraints->min_uV; 877 int cmax = constraints->max_uV; 878 879 /* it's safe to autoconfigure fixed-voltage supplies 880 and the constraints are used by list_voltage. */ 881 if (count == 1 && !cmin) { 882 cmin = 1; 883 cmax = INT_MAX; 884 constraints->min_uV = cmin; 885 constraints->max_uV = cmax; 886 } 887 888 /* voltage constraints are optional */ 889 if ((cmin == 0) && (cmax == 0)) 890 return 0; 891 892 /* else require explicit machine-level constraints */ 893 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 894 rdev_err(rdev, "invalid voltage constraints\n"); 895 return -EINVAL; 896 } 897 898 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 899 for (i = 0; i < count; i++) { 900 int value; 901 902 value = ops->list_voltage(rdev, i); 903 if (value <= 0) 904 continue; 905 906 /* maybe adjust [min_uV..max_uV] */ 907 if (value >= cmin && value < min_uV) 908 min_uV = value; 909 if (value <= cmax && value > max_uV) 910 max_uV = value; 911 } 912 913 /* final: [min_uV..max_uV] valid iff constraints valid */ 914 if (max_uV < min_uV) { 915 rdev_err(rdev, 916 "unsupportable voltage constraints %u-%uuV\n", 917 min_uV, max_uV); 918 return -EINVAL; 919 } 920 921 /* use regulator's subset of machine constraints */ 922 if (constraints->min_uV < min_uV) { 923 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 924 constraints->min_uV, min_uV); 925 constraints->min_uV = min_uV; 926 } 927 if (constraints->max_uV > max_uV) { 928 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 929 constraints->max_uV, max_uV); 930 constraints->max_uV = max_uV; 931 } 932 } 933 934 return 0; 935} 936 937static int machine_constraints_current(struct regulator_dev *rdev, 938 struct regulation_constraints *constraints) 939{ 940 struct regulator_ops *ops = rdev->desc->ops; 941 int ret; 942 943 if (!constraints->min_uA && !constraints->max_uA) 944 return 0; 945 946 if (constraints->min_uA > constraints->max_uA) { 947 rdev_err(rdev, "Invalid current constraints\n"); 948 return -EINVAL; 949 } 950 951 if (!ops->set_current_limit || !ops->get_current_limit) { 952 rdev_warn(rdev, "Operation of current configuration missing\n"); 953 return 0; 954 } 955 956 /* Set regulator current in constraints range */ 957 ret = ops->set_current_limit(rdev, constraints->min_uA, 958 constraints->max_uA); 959 if (ret < 0) { 960 rdev_err(rdev, "Failed to set current constraint, %d\n", ret); 961 return ret; 962 } 963 964 return 0; 965} 966 967static int _regulator_do_enable(struct regulator_dev *rdev); 968 969/** 970 * set_machine_constraints - sets regulator constraints 971 * @rdev: regulator source 972 * @constraints: constraints to apply 973 * 974 * Allows platform initialisation code to define and constrain 975 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 976 * Constraints *must* be set by platform code in order for some 977 * regulator operations to proceed i.e. set_voltage, set_current_limit, 978 * set_mode. 979 */ 980static int set_machine_constraints(struct regulator_dev *rdev, 981 const struct regulation_constraints *constraints) 982{ 983 int ret = 0; 984 struct regulator_ops *ops = rdev->desc->ops; 985 986 if (constraints) 987 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 988 GFP_KERNEL); 989 else 990 rdev->constraints = kzalloc(sizeof(*constraints), 991 GFP_KERNEL); 992 if (!rdev->constraints) 993 return -ENOMEM; 994 995 ret = machine_constraints_voltage(rdev, rdev->constraints); 996 if (ret != 0) 997 goto out; 998 999 ret = machine_constraints_current(rdev, rdev->constraints); 1000 if (ret != 0) 1001 goto out; 1002 1003 /* do we need to setup our suspend state */ 1004 if (rdev->constraints->initial_state) { 1005 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 1006 if (ret < 0) { 1007 rdev_err(rdev, "failed to set suspend state\n"); 1008 goto out; 1009 } 1010 } 1011 1012 if (rdev->constraints->initial_mode) { 1013 if (!ops->set_mode) { 1014 rdev_err(rdev, "no set_mode operation\n"); 1015 ret = -EINVAL; 1016 goto out; 1017 } 1018 1019 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 1020 if (ret < 0) { 1021 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 1022 goto out; 1023 } 1024 } 1025 1026 /* If the constraints say the regulator should be on at this point 1027 * and we have control then make sure it is enabled. 1028 */ 1029 if (rdev->constraints->always_on || rdev->constraints->boot_on) { 1030 ret = _regulator_do_enable(rdev); 1031 if (ret < 0 && ret != -EINVAL) { 1032 rdev_err(rdev, "failed to enable\n"); 1033 goto out; 1034 } 1035 } 1036 1037 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 1038 && ops->set_ramp_delay) { 1039 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 1040 if (ret < 0) { 1041 rdev_err(rdev, "failed to set ramp_delay\n"); 1042 goto out; 1043 } 1044 } 1045 1046 print_constraints(rdev); 1047 return 0; 1048out: 1049 kfree(rdev->constraints); 1050 rdev->constraints = NULL; 1051 return ret; 1052} 1053 1054/** 1055 * set_supply - set regulator supply regulator 1056 * @rdev: regulator name 1057 * @supply_rdev: supply regulator name 1058 * 1059 * Called by platform initialisation code to set the supply regulator for this 1060 * regulator. This ensures that a regulators supply will also be enabled by the 1061 * core if it's child is enabled. 1062 */ 1063static int set_supply(struct regulator_dev *rdev, 1064 struct regulator_dev *supply_rdev) 1065{ 1066 int err; 1067 1068 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1069 1070 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1071 if (rdev->supply == NULL) { 1072 err = -ENOMEM; 1073 return err; 1074 } 1075 supply_rdev->open_count++; 1076 1077 return 0; 1078} 1079 1080/** 1081 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1082 * @rdev: regulator source 1083 * @consumer_dev_name: dev_name() string for device supply applies to 1084 * @supply: symbolic name for supply 1085 * 1086 * Allows platform initialisation code to map physical regulator 1087 * sources to symbolic names for supplies for use by devices. Devices 1088 * should use these symbolic names to request regulators, avoiding the 1089 * need to provide board-specific regulator names as platform data. 1090 */ 1091static int set_consumer_device_supply(struct regulator_dev *rdev, 1092 const char *consumer_dev_name, 1093 const char *supply) 1094{ 1095 struct regulator_map *node; 1096 int has_dev; 1097 1098 if (supply == NULL) 1099 return -EINVAL; 1100 1101 if (consumer_dev_name != NULL) 1102 has_dev = 1; 1103 else 1104 has_dev = 0; 1105 1106 list_for_each_entry(node, ®ulator_map_list, list) { 1107 if (node->dev_name && consumer_dev_name) { 1108 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1109 continue; 1110 } else if (node->dev_name || consumer_dev_name) { 1111 continue; 1112 } 1113 1114 if (strcmp(node->supply, supply) != 0) 1115 continue; 1116 1117 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1118 consumer_dev_name, 1119 dev_name(&node->regulator->dev), 1120 node->regulator->desc->name, 1121 supply, 1122 dev_name(&rdev->dev), rdev_get_name(rdev)); 1123 return -EBUSY; 1124 } 1125 1126 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1127 if (node == NULL) 1128 return -ENOMEM; 1129 1130 node->regulator = rdev; 1131 node->supply = supply; 1132 1133 if (has_dev) { 1134 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1135 if (node->dev_name == NULL) { 1136 kfree(node); 1137 return -ENOMEM; 1138 } 1139 } 1140 1141 list_add(&node->list, ®ulator_map_list); 1142 return 0; 1143} 1144 1145static void unset_regulator_supplies(struct regulator_dev *rdev) 1146{ 1147 struct regulator_map *node, *n; 1148 1149 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1150 if (rdev == node->regulator) { 1151 list_del(&node->list); 1152 kfree(node->dev_name); 1153 kfree(node); 1154 } 1155 } 1156} 1157 1158#define REG_STR_SIZE 64 1159 1160static struct regulator *create_regulator(struct regulator_dev *rdev, 1161 struct device *dev, 1162 const char *supply_name) 1163{ 1164 struct regulator *regulator; 1165 char buf[REG_STR_SIZE]; 1166 int err, size; 1167 1168 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1169 if (regulator == NULL) 1170 return NULL; 1171 1172 mutex_lock(&rdev->mutex); 1173 regulator->rdev = rdev; 1174 list_add(®ulator->list, &rdev->consumer_list); 1175 1176 if (dev) { 1177 regulator->dev = dev; 1178 1179 /* Add a link to the device sysfs entry */ 1180 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1181 dev->kobj.name, supply_name); 1182 if (size >= REG_STR_SIZE) 1183 goto overflow_err; 1184 1185 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1186 if (regulator->supply_name == NULL) 1187 goto overflow_err; 1188 1189 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1190 buf); 1191 if (err) { 1192 rdev_warn(rdev, "could not add device link %s err %d\n", 1193 dev->kobj.name, err); 1194 /* non-fatal */ 1195 } 1196 } else { 1197 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1198 if (regulator->supply_name == NULL) 1199 goto overflow_err; 1200 } 1201 1202 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1203 rdev->debugfs); 1204 if (!regulator->debugfs) { 1205 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1206 } else { 1207 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1208 ®ulator->uA_load); 1209 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1210 ®ulator->min_uV); 1211 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1212 ®ulator->max_uV); 1213 } 1214 1215 /* 1216 * Check now if the regulator is an always on regulator - if 1217 * it is then we don't need to do nearly so much work for 1218 * enable/disable calls. 1219 */ 1220 if (!_regulator_can_change_status(rdev) && 1221 _regulator_is_enabled(rdev)) 1222 regulator->always_on = true; 1223 1224 mutex_unlock(&rdev->mutex); 1225 return regulator; 1226overflow_err: 1227 list_del(®ulator->list); 1228 kfree(regulator); 1229 mutex_unlock(&rdev->mutex); 1230 return NULL; 1231} 1232 1233static int _regulator_get_enable_time(struct regulator_dev *rdev) 1234{ 1235 if (rdev->constraints && rdev->constraints->enable_time) 1236 return rdev->constraints->enable_time; 1237 if (!rdev->desc->ops->enable_time) 1238 return rdev->desc->enable_time; 1239 return rdev->desc->ops->enable_time(rdev); 1240} 1241 1242static struct regulator_supply_alias *regulator_find_supply_alias( 1243 struct device *dev, const char *supply) 1244{ 1245 struct regulator_supply_alias *map; 1246 1247 list_for_each_entry(map, ®ulator_supply_alias_list, list) 1248 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) 1249 return map; 1250 1251 return NULL; 1252} 1253 1254static void regulator_supply_alias(struct device **dev, const char **supply) 1255{ 1256 struct regulator_supply_alias *map; 1257 1258 map = regulator_find_supply_alias(*dev, *supply); 1259 if (map) { 1260 dev_dbg(*dev, "Mapping supply %s to %s,%s\n", 1261 *supply, map->alias_supply, 1262 dev_name(map->alias_dev)); 1263 *dev = map->alias_dev; 1264 *supply = map->alias_supply; 1265 } 1266} 1267 1268static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1269 const char *supply, 1270 int *ret) 1271{ 1272 struct regulator_dev *r; 1273 struct device_node *node; 1274 struct regulator_map *map; 1275 const char *devname = NULL; 1276 1277 regulator_supply_alias(&dev, &supply); 1278 1279 /* first do a dt based lookup */ 1280 if (dev && dev->of_node) { 1281 node = of_get_regulator(dev, supply); 1282 if (node) { 1283 list_for_each_entry(r, ®ulator_list, list) 1284 if (r->dev.parent && 1285 node == r->dev.of_node) 1286 return r; 1287 *ret = -EPROBE_DEFER; 1288 return NULL; 1289 } else { 1290 /* 1291 * If we couldn't even get the node then it's 1292 * not just that the device didn't register 1293 * yet, there's no node and we'll never 1294 * succeed. 1295 */ 1296 *ret = -ENODEV; 1297 } 1298 } 1299 1300 /* if not found, try doing it non-dt way */ 1301 if (dev) 1302 devname = dev_name(dev); 1303 1304 list_for_each_entry(r, ®ulator_list, list) 1305 if (strcmp(rdev_get_name(r), supply) == 0) 1306 return r; 1307 1308 list_for_each_entry(map, ®ulator_map_list, list) { 1309 /* If the mapping has a device set up it must match */ 1310 if (map->dev_name && 1311 (!devname || strcmp(map->dev_name, devname))) 1312 continue; 1313 1314 if (strcmp(map->supply, supply) == 0) 1315 return map->regulator; 1316 } 1317 1318 1319 return NULL; 1320} 1321 1322/* Internal regulator request function */ 1323static struct regulator *_regulator_get(struct device *dev, const char *id, 1324 bool exclusive, bool allow_dummy) 1325{ 1326 struct regulator_dev *rdev; 1327 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1328 const char *devname = NULL; 1329 int ret; 1330 1331 if (id == NULL) { 1332 pr_err("get() with no identifier\n"); 1333 return ERR_PTR(-EINVAL); 1334 } 1335 1336 if (dev) 1337 devname = dev_name(dev); 1338 1339 if (have_full_constraints()) 1340 ret = -ENODEV; 1341 else 1342 ret = -EPROBE_DEFER; 1343 1344 mutex_lock(®ulator_list_mutex); 1345 1346 rdev = regulator_dev_lookup(dev, id, &ret); 1347 if (rdev) 1348 goto found; 1349 1350 regulator = ERR_PTR(ret); 1351 1352 /* 1353 * If we have return value from dev_lookup fail, we do not expect to 1354 * succeed, so, quit with appropriate error value 1355 */ 1356 if (ret && ret != -ENODEV) 1357 goto out; 1358 1359 if (!devname) 1360 devname = "deviceless"; 1361 1362 /* 1363 * Assume that a regulator is physically present and enabled 1364 * even if it isn't hooked up and just provide a dummy. 1365 */ 1366 if (have_full_constraints() && allow_dummy) { 1367 pr_warn("%s supply %s not found, using dummy regulator\n", 1368 devname, id); 1369 1370 rdev = dummy_regulator_rdev; 1371 goto found; 1372 /* Don't log an error when called from regulator_get_optional() */ 1373 } else if (!have_full_constraints() || exclusive) { 1374 dev_warn(dev, "dummy supplies not allowed\n"); 1375 } 1376 1377 mutex_unlock(®ulator_list_mutex); 1378 return regulator; 1379 1380found: 1381 if (rdev->exclusive) { 1382 regulator = ERR_PTR(-EPERM); 1383 goto out; 1384 } 1385 1386 if (exclusive && rdev->open_count) { 1387 regulator = ERR_PTR(-EBUSY); 1388 goto out; 1389 } 1390 1391 if (!try_module_get(rdev->owner)) 1392 goto out; 1393 1394 regulator = create_regulator(rdev, dev, id); 1395 if (regulator == NULL) { 1396 regulator = ERR_PTR(-ENOMEM); 1397 module_put(rdev->owner); 1398 goto out; 1399 } 1400 1401 rdev->open_count++; 1402 if (exclusive) { 1403 rdev->exclusive = 1; 1404 1405 ret = _regulator_is_enabled(rdev); 1406 if (ret > 0) 1407 rdev->use_count = 1; 1408 else 1409 rdev->use_count = 0; 1410 } 1411 1412out: 1413 mutex_unlock(®ulator_list_mutex); 1414 1415 return regulator; 1416} 1417 1418/** 1419 * regulator_get - lookup and obtain a reference to a regulator. 1420 * @dev: device for regulator "consumer" 1421 * @id: Supply name or regulator ID. 1422 * 1423 * Returns a struct regulator corresponding to the regulator producer, 1424 * or IS_ERR() condition containing errno. 1425 * 1426 * Use of supply names configured via regulator_set_device_supply() is 1427 * strongly encouraged. It is recommended that the supply name used 1428 * should match the name used for the supply and/or the relevant 1429 * device pins in the datasheet. 1430 */ 1431struct regulator *regulator_get(struct device *dev, const char *id) 1432{ 1433 return _regulator_get(dev, id, false, true); 1434} 1435EXPORT_SYMBOL_GPL(regulator_get); 1436 1437/** 1438 * regulator_get_exclusive - obtain exclusive access to a regulator. 1439 * @dev: device for regulator "consumer" 1440 * @id: Supply name or regulator ID. 1441 * 1442 * Returns a struct regulator corresponding to the regulator producer, 1443 * or IS_ERR() condition containing errno. Other consumers will be 1444 * unable to obtain this regulator while this reference is held and the 1445 * use count for the regulator will be initialised to reflect the current 1446 * state of the regulator. 1447 * 1448 * This is intended for use by consumers which cannot tolerate shared 1449 * use of the regulator such as those which need to force the 1450 * regulator off for correct operation of the hardware they are 1451 * controlling. 1452 * 1453 * Use of supply names configured via regulator_set_device_supply() is 1454 * strongly encouraged. It is recommended that the supply name used 1455 * should match the name used for the supply and/or the relevant 1456 * device pins in the datasheet. 1457 */ 1458struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1459{ 1460 return _regulator_get(dev, id, true, false); 1461} 1462EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1463 1464/** 1465 * regulator_get_optional - obtain optional access to a regulator. 1466 * @dev: device for regulator "consumer" 1467 * @id: Supply name or regulator ID. 1468 * 1469 * Returns a struct regulator corresponding to the regulator producer, 1470 * or IS_ERR() condition containing errno. 1471 * 1472 * This is intended for use by consumers for devices which can have 1473 * some supplies unconnected in normal use, such as some MMC devices. 1474 * It can allow the regulator core to provide stub supplies for other 1475 * supplies requested using normal regulator_get() calls without 1476 * disrupting the operation of drivers that can handle absent 1477 * supplies. 1478 * 1479 * Use of supply names configured via regulator_set_device_supply() is 1480 * strongly encouraged. It is recommended that the supply name used 1481 * should match the name used for the supply and/or the relevant 1482 * device pins in the datasheet. 1483 */ 1484struct regulator *regulator_get_optional(struct device *dev, const char *id) 1485{ 1486 return _regulator_get(dev, id, false, false); 1487} 1488EXPORT_SYMBOL_GPL(regulator_get_optional); 1489 1490/* Locks held by regulator_put() */ 1491static void _regulator_put(struct regulator *regulator) 1492{ 1493 struct regulator_dev *rdev; 1494 1495 if (regulator == NULL || IS_ERR(regulator)) 1496 return; 1497 1498 rdev = regulator->rdev; 1499 1500 debugfs_remove_recursive(regulator->debugfs); 1501 1502 /* remove any sysfs entries */ 1503 if (regulator->dev) 1504 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1505 kfree(regulator->supply_name); 1506 list_del(®ulator->list); 1507 kfree(regulator); 1508 1509 rdev->open_count--; 1510 rdev->exclusive = 0; 1511 1512 module_put(rdev->owner); 1513} 1514 1515/** 1516 * regulator_put - "free" the regulator source 1517 * @regulator: regulator source 1518 * 1519 * Note: drivers must ensure that all regulator_enable calls made on this 1520 * regulator source are balanced by regulator_disable calls prior to calling 1521 * this function. 1522 */ 1523void regulator_put(struct regulator *regulator) 1524{ 1525 mutex_lock(®ulator_list_mutex); 1526 _regulator_put(regulator); 1527 mutex_unlock(®ulator_list_mutex); 1528} 1529EXPORT_SYMBOL_GPL(regulator_put); 1530 1531/** 1532 * regulator_register_supply_alias - Provide device alias for supply lookup 1533 * 1534 * @dev: device that will be given as the regulator "consumer" 1535 * @id: Supply name or regulator ID 1536 * @alias_dev: device that should be used to lookup the supply 1537 * @alias_id: Supply name or regulator ID that should be used to lookup the 1538 * supply 1539 * 1540 * All lookups for id on dev will instead be conducted for alias_id on 1541 * alias_dev. 1542 */ 1543int regulator_register_supply_alias(struct device *dev, const char *id, 1544 struct device *alias_dev, 1545 const char *alias_id) 1546{ 1547 struct regulator_supply_alias *map; 1548 1549 map = regulator_find_supply_alias(dev, id); 1550 if (map) 1551 return -EEXIST; 1552 1553 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1554 if (!map) 1555 return -ENOMEM; 1556 1557 map->src_dev = dev; 1558 map->src_supply = id; 1559 map->alias_dev = alias_dev; 1560 map->alias_supply = alias_id; 1561 1562 list_add(&map->list, ®ulator_supply_alias_list); 1563 1564 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1565 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1566 1567 return 0; 1568} 1569EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1570 1571/** 1572 * regulator_unregister_supply_alias - Remove device alias 1573 * 1574 * @dev: device that will be given as the regulator "consumer" 1575 * @id: Supply name or regulator ID 1576 * 1577 * Remove a lookup alias if one exists for id on dev. 1578 */ 1579void regulator_unregister_supply_alias(struct device *dev, const char *id) 1580{ 1581 struct regulator_supply_alias *map; 1582 1583 map = regulator_find_supply_alias(dev, id); 1584 if (map) { 1585 list_del(&map->list); 1586 kfree(map); 1587 } 1588} 1589EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1590 1591/** 1592 * regulator_bulk_register_supply_alias - register multiple aliases 1593 * 1594 * @dev: device that will be given as the regulator "consumer" 1595 * @id: List of supply names or regulator IDs 1596 * @alias_dev: device that should be used to lookup the supply 1597 * @alias_id: List of supply names or regulator IDs that should be used to 1598 * lookup the supply 1599 * @num_id: Number of aliases to register 1600 * 1601 * @return 0 on success, an errno on failure. 1602 * 1603 * This helper function allows drivers to register several supply 1604 * aliases in one operation. If any of the aliases cannot be 1605 * registered any aliases that were registered will be removed 1606 * before returning to the caller. 1607 */ 1608int regulator_bulk_register_supply_alias(struct device *dev, 1609 const char *const *id, 1610 struct device *alias_dev, 1611 const char *const *alias_id, 1612 int num_id) 1613{ 1614 int i; 1615 int ret; 1616 1617 for (i = 0; i < num_id; ++i) { 1618 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1619 alias_id[i]); 1620 if (ret < 0) 1621 goto err; 1622 } 1623 1624 return 0; 1625 1626err: 1627 dev_err(dev, 1628 "Failed to create supply alias %s,%s -> %s,%s\n", 1629 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1630 1631 while (--i >= 0) 1632 regulator_unregister_supply_alias(dev, id[i]); 1633 1634 return ret; 1635} 1636EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1637 1638/** 1639 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1640 * 1641 * @dev: device that will be given as the regulator "consumer" 1642 * @id: List of supply names or regulator IDs 1643 * @num_id: Number of aliases to unregister 1644 * 1645 * This helper function allows drivers to unregister several supply 1646 * aliases in one operation. 1647 */ 1648void regulator_bulk_unregister_supply_alias(struct device *dev, 1649 const char *const *id, 1650 int num_id) 1651{ 1652 int i; 1653 1654 for (i = 0; i < num_id; ++i) 1655 regulator_unregister_supply_alias(dev, id[i]); 1656} 1657EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1658 1659 1660/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1661static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1662 const struct regulator_config *config) 1663{ 1664 struct regulator_enable_gpio *pin; 1665 int ret; 1666 1667 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1668 if (pin->gpio == config->ena_gpio) { 1669 rdev_dbg(rdev, "GPIO %d is already used\n", 1670 config->ena_gpio); 1671 goto update_ena_gpio_to_rdev; 1672 } 1673 } 1674 1675 ret = gpio_request_one(config->ena_gpio, 1676 GPIOF_DIR_OUT | config->ena_gpio_flags, 1677 rdev_get_name(rdev)); 1678 if (ret) 1679 return ret; 1680 1681 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1682 if (pin == NULL) { 1683 gpio_free(config->ena_gpio); 1684 return -ENOMEM; 1685 } 1686 1687 pin->gpio = config->ena_gpio; 1688 pin->ena_gpio_invert = config->ena_gpio_invert; 1689 list_add(&pin->list, ®ulator_ena_gpio_list); 1690 1691update_ena_gpio_to_rdev: 1692 pin->request_count++; 1693 rdev->ena_pin = pin; 1694 return 0; 1695} 1696 1697static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1698{ 1699 struct regulator_enable_gpio *pin, *n; 1700 1701 if (!rdev->ena_pin) 1702 return; 1703 1704 /* Free the GPIO only in case of no use */ 1705 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1706 if (pin->gpio == rdev->ena_pin->gpio) { 1707 if (pin->request_count <= 1) { 1708 pin->request_count = 0; 1709 gpio_free(pin->gpio); 1710 list_del(&pin->list); 1711 kfree(pin); 1712 } else { 1713 pin->request_count--; 1714 } 1715 } 1716 } 1717} 1718 1719/** 1720 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1721 * @rdev: regulator_dev structure 1722 * @enable: enable GPIO at initial use? 1723 * 1724 * GPIO is enabled in case of initial use. (enable_count is 0) 1725 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1726 */ 1727static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1728{ 1729 struct regulator_enable_gpio *pin = rdev->ena_pin; 1730 1731 if (!pin) 1732 return -EINVAL; 1733 1734 if (enable) { 1735 /* Enable GPIO at initial use */ 1736 if (pin->enable_count == 0) 1737 gpio_set_value_cansleep(pin->gpio, 1738 !pin->ena_gpio_invert); 1739 1740 pin->enable_count++; 1741 } else { 1742 if (pin->enable_count > 1) { 1743 pin->enable_count--; 1744 return 0; 1745 } 1746 1747 /* Disable GPIO if not used */ 1748 if (pin->enable_count <= 1) { 1749 gpio_set_value_cansleep(pin->gpio, 1750 pin->ena_gpio_invert); 1751 pin->enable_count = 0; 1752 } 1753 } 1754 1755 return 0; 1756} 1757 1758static int _regulator_do_enable(struct regulator_dev *rdev) 1759{ 1760 int ret, delay; 1761 1762 /* Query before enabling in case configuration dependent. */ 1763 ret = _regulator_get_enable_time(rdev); 1764 if (ret >= 0) { 1765 delay = ret; 1766 } else { 1767 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1768 delay = 0; 1769 } 1770 1771 trace_regulator_enable(rdev_get_name(rdev)); 1772 1773 if (rdev->ena_pin) { 1774 ret = regulator_ena_gpio_ctrl(rdev, true); 1775 if (ret < 0) 1776 return ret; 1777 rdev->ena_gpio_state = 1; 1778 } else if (rdev->desc->ops->enable) { 1779 ret = rdev->desc->ops->enable(rdev); 1780 if (ret < 0) 1781 return ret; 1782 } else { 1783 return -EINVAL; 1784 } 1785 1786 /* Allow the regulator to ramp; it would be useful to extend 1787 * this for bulk operations so that the regulators can ramp 1788 * together. */ 1789 trace_regulator_enable_delay(rdev_get_name(rdev)); 1790 1791 /* 1792 * Delay for the requested amount of time as per the guidelines in: 1793 * 1794 * Documentation/timers/timers-howto.txt 1795 * 1796 * The assumption here is that regulators will never be enabled in 1797 * atomic context and therefore sleeping functions can be used. 1798 */ 1799 if (delay) { 1800 unsigned int ms = delay / 1000; 1801 unsigned int us = delay % 1000; 1802 1803 if (ms > 0) { 1804 /* 1805 * For small enough values, handle super-millisecond 1806 * delays in the usleep_range() call below. 1807 */ 1808 if (ms < 20) 1809 us += ms * 1000; 1810 else 1811 msleep(ms); 1812 } 1813 1814 /* 1815 * Give the scheduler some room to coalesce with any other 1816 * wakeup sources. For delays shorter than 10 us, don't even 1817 * bother setting up high-resolution timers and just busy- 1818 * loop. 1819 */ 1820 if (us >= 10) 1821 usleep_range(us, us + 100); 1822 else 1823 udelay(us); 1824 } 1825 1826 trace_regulator_enable_complete(rdev_get_name(rdev)); 1827 1828 return 0; 1829} 1830 1831/* locks held by regulator_enable() */ 1832static int _regulator_enable(struct regulator_dev *rdev) 1833{ 1834 int ret; 1835 1836 /* check voltage and requested load before enabling */ 1837 if (rdev->constraints && 1838 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1839 drms_uA_update(rdev); 1840 1841 if (rdev->use_count == 0) { 1842 /* The regulator may on if it's not switchable or left on */ 1843 ret = _regulator_is_enabled(rdev); 1844 if (ret == -EINVAL || ret == 0) { 1845 if (!_regulator_can_change_status(rdev)) 1846 return -EPERM; 1847 1848 ret = _regulator_do_enable(rdev); 1849 if (ret < 0) 1850 return ret; 1851 1852 } else if (ret < 0) { 1853 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1854 return ret; 1855 } 1856 /* Fallthrough on positive return values - already enabled */ 1857 } 1858 1859 rdev->use_count++; 1860 1861 return 0; 1862} 1863 1864/** 1865 * regulator_enable - enable regulator output 1866 * @regulator: regulator source 1867 * 1868 * Request that the regulator be enabled with the regulator output at 1869 * the predefined voltage or current value. Calls to regulator_enable() 1870 * must be balanced with calls to regulator_disable(). 1871 * 1872 * NOTE: the output value can be set by other drivers, boot loader or may be 1873 * hardwired in the regulator. 1874 */ 1875int regulator_enable(struct regulator *regulator) 1876{ 1877 struct regulator_dev *rdev = regulator->rdev; 1878 int ret = 0; 1879 1880 if (regulator->always_on) 1881 return 0; 1882 1883 if (rdev->supply) { 1884 ret = regulator_enable(rdev->supply); 1885 if (ret != 0) 1886 return ret; 1887 } 1888 1889 mutex_lock(&rdev->mutex); 1890 ret = _regulator_enable(rdev); 1891 mutex_unlock(&rdev->mutex); 1892 1893 if (ret != 0 && rdev->supply) 1894 regulator_disable(rdev->supply); 1895 1896 return ret; 1897} 1898EXPORT_SYMBOL_GPL(regulator_enable); 1899 1900static int _regulator_do_disable(struct regulator_dev *rdev) 1901{ 1902 int ret; 1903 1904 trace_regulator_disable(rdev_get_name(rdev)); 1905 1906 if (rdev->ena_pin) { 1907 ret = regulator_ena_gpio_ctrl(rdev, false); 1908 if (ret < 0) 1909 return ret; 1910 rdev->ena_gpio_state = 0; 1911 1912 } else if (rdev->desc->ops->disable) { 1913 ret = rdev->desc->ops->disable(rdev); 1914 if (ret != 0) 1915 return ret; 1916 } 1917 1918 trace_regulator_disable_complete(rdev_get_name(rdev)); 1919 1920 return 0; 1921} 1922 1923/* locks held by regulator_disable() */ 1924static int _regulator_disable(struct regulator_dev *rdev) 1925{ 1926 int ret = 0; 1927 1928 if (WARN(rdev->use_count <= 0, 1929 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1930 return -EIO; 1931 1932 /* are we the last user and permitted to disable ? */ 1933 if (rdev->use_count == 1 && 1934 (rdev->constraints && !rdev->constraints->always_on)) { 1935 1936 /* we are last user */ 1937 if (_regulator_can_change_status(rdev)) { 1938 ret = _regulator_do_disable(rdev); 1939 if (ret < 0) { 1940 rdev_err(rdev, "failed to disable\n"); 1941 return ret; 1942 } 1943 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1944 NULL); 1945 } 1946 1947 rdev->use_count = 0; 1948 } else if (rdev->use_count > 1) { 1949 1950 if (rdev->constraints && 1951 (rdev->constraints->valid_ops_mask & 1952 REGULATOR_CHANGE_DRMS)) 1953 drms_uA_update(rdev); 1954 1955 rdev->use_count--; 1956 } 1957 1958 return ret; 1959} 1960 1961/** 1962 * regulator_disable - disable regulator output 1963 * @regulator: regulator source 1964 * 1965 * Disable the regulator output voltage or current. Calls to 1966 * regulator_enable() must be balanced with calls to 1967 * regulator_disable(). 1968 * 1969 * NOTE: this will only disable the regulator output if no other consumer 1970 * devices have it enabled, the regulator device supports disabling and 1971 * machine constraints permit this operation. 1972 */ 1973int regulator_disable(struct regulator *regulator) 1974{ 1975 struct regulator_dev *rdev = regulator->rdev; 1976 int ret = 0; 1977 1978 if (regulator->always_on) 1979 return 0; 1980 1981 mutex_lock(&rdev->mutex); 1982 ret = _regulator_disable(rdev); 1983 mutex_unlock(&rdev->mutex); 1984 1985 if (ret == 0 && rdev->supply) 1986 regulator_disable(rdev->supply); 1987 1988 return ret; 1989} 1990EXPORT_SYMBOL_GPL(regulator_disable); 1991 1992/* locks held by regulator_force_disable() */ 1993static int _regulator_force_disable(struct regulator_dev *rdev) 1994{ 1995 int ret = 0; 1996 1997 ret = _regulator_do_disable(rdev); 1998 if (ret < 0) { 1999 rdev_err(rdev, "failed to force disable\n"); 2000 return ret; 2001 } 2002 2003 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 2004 REGULATOR_EVENT_DISABLE, NULL); 2005 2006 return 0; 2007} 2008 2009/** 2010 * regulator_force_disable - force disable regulator output 2011 * @regulator: regulator source 2012 * 2013 * Forcibly disable the regulator output voltage or current. 2014 * NOTE: this *will* disable the regulator output even if other consumer 2015 * devices have it enabled. This should be used for situations when device 2016 * damage will likely occur if the regulator is not disabled (e.g. over temp). 2017 */ 2018int regulator_force_disable(struct regulator *regulator) 2019{ 2020 struct regulator_dev *rdev = regulator->rdev; 2021 int ret; 2022 2023 mutex_lock(&rdev->mutex); 2024 regulator->uA_load = 0; 2025 ret = _regulator_force_disable(regulator->rdev); 2026 mutex_unlock(&rdev->mutex); 2027 2028 if (rdev->supply) 2029 while (rdev->open_count--) 2030 regulator_disable(rdev->supply); 2031 2032 return ret; 2033} 2034EXPORT_SYMBOL_GPL(regulator_force_disable); 2035 2036static void regulator_disable_work(struct work_struct *work) 2037{ 2038 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 2039 disable_work.work); 2040 int count, i, ret; 2041 2042 mutex_lock(&rdev->mutex); 2043 2044 BUG_ON(!rdev->deferred_disables); 2045 2046 count = rdev->deferred_disables; 2047 rdev->deferred_disables = 0; 2048 2049 for (i = 0; i < count; i++) { 2050 ret = _regulator_disable(rdev); 2051 if (ret != 0) 2052 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 2053 } 2054 2055 mutex_unlock(&rdev->mutex); 2056 2057 if (rdev->supply) { 2058 for (i = 0; i < count; i++) { 2059 ret = regulator_disable(rdev->supply); 2060 if (ret != 0) { 2061 rdev_err(rdev, 2062 "Supply disable failed: %d\n", ret); 2063 } 2064 } 2065 } 2066} 2067 2068/** 2069 * regulator_disable_deferred - disable regulator output with delay 2070 * @regulator: regulator source 2071 * @ms: miliseconds until the regulator is disabled 2072 * 2073 * Execute regulator_disable() on the regulator after a delay. This 2074 * is intended for use with devices that require some time to quiesce. 2075 * 2076 * NOTE: this will only disable the regulator output if no other consumer 2077 * devices have it enabled, the regulator device supports disabling and 2078 * machine constraints permit this operation. 2079 */ 2080int regulator_disable_deferred(struct regulator *regulator, int ms) 2081{ 2082 struct regulator_dev *rdev = regulator->rdev; 2083 int ret; 2084 2085 if (regulator->always_on) 2086 return 0; 2087 2088 if (!ms) 2089 return regulator_disable(regulator); 2090 2091 mutex_lock(&rdev->mutex); 2092 rdev->deferred_disables++; 2093 mutex_unlock(&rdev->mutex); 2094 2095 ret = queue_delayed_work(system_power_efficient_wq, 2096 &rdev->disable_work, 2097 msecs_to_jiffies(ms)); 2098 if (ret < 0) 2099 return ret; 2100 else 2101 return 0; 2102} 2103EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2104 2105static int _regulator_is_enabled(struct regulator_dev *rdev) 2106{ 2107 /* A GPIO control always takes precedence */ 2108 if (rdev->ena_pin) 2109 return rdev->ena_gpio_state; 2110 2111 /* If we don't know then assume that the regulator is always on */ 2112 if (!rdev->desc->ops->is_enabled) 2113 return 1; 2114 2115 return rdev->desc->ops->is_enabled(rdev); 2116} 2117 2118/** 2119 * regulator_is_enabled - is the regulator output enabled 2120 * @regulator: regulator source 2121 * 2122 * Returns positive if the regulator driver backing the source/client 2123 * has requested that the device be enabled, zero if it hasn't, else a 2124 * negative errno code. 2125 * 2126 * Note that the device backing this regulator handle can have multiple 2127 * users, so it might be enabled even if regulator_enable() was never 2128 * called for this particular source. 2129 */ 2130int regulator_is_enabled(struct regulator *regulator) 2131{ 2132 int ret; 2133 2134 if (regulator->always_on) 2135 return 1; 2136 2137 mutex_lock(®ulator->rdev->mutex); 2138 ret = _regulator_is_enabled(regulator->rdev); 2139 mutex_unlock(®ulator->rdev->mutex); 2140 2141 return ret; 2142} 2143EXPORT_SYMBOL_GPL(regulator_is_enabled); 2144 2145/** 2146 * regulator_can_change_voltage - check if regulator can change voltage 2147 * @regulator: regulator source 2148 * 2149 * Returns positive if the regulator driver backing the source/client 2150 * can change its voltage, false otherwise. Useful for detecting fixed 2151 * or dummy regulators and disabling voltage change logic in the client 2152 * driver. 2153 */ 2154int regulator_can_change_voltage(struct regulator *regulator) 2155{ 2156 struct regulator_dev *rdev = regulator->rdev; 2157 2158 if (rdev->constraints && 2159 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2160 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2161 return 1; 2162 2163 if (rdev->desc->continuous_voltage_range && 2164 rdev->constraints->min_uV && rdev->constraints->max_uV && 2165 rdev->constraints->min_uV != rdev->constraints->max_uV) 2166 return 1; 2167 } 2168 2169 return 0; 2170} 2171EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2172 2173/** 2174 * regulator_count_voltages - count regulator_list_voltage() selectors 2175 * @regulator: regulator source 2176 * 2177 * Returns number of selectors, or negative errno. Selectors are 2178 * numbered starting at zero, and typically correspond to bitfields 2179 * in hardware registers. 2180 */ 2181int regulator_count_voltages(struct regulator *regulator) 2182{ 2183 struct regulator_dev *rdev = regulator->rdev; 2184 2185 return rdev->desc->n_voltages ? : -EINVAL; 2186} 2187EXPORT_SYMBOL_GPL(regulator_count_voltages); 2188 2189/** 2190 * regulator_list_voltage - enumerate supported voltages 2191 * @regulator: regulator source 2192 * @selector: identify voltage to list 2193 * Context: can sleep 2194 * 2195 * Returns a voltage that can be passed to @regulator_set_voltage(), 2196 * zero if this selector code can't be used on this system, or a 2197 * negative errno. 2198 */ 2199int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2200{ 2201 struct regulator_dev *rdev = regulator->rdev; 2202 struct regulator_ops *ops = rdev->desc->ops; 2203 int ret; 2204 2205 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) 2206 return rdev->desc->fixed_uV; 2207 2208 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2209 return -EINVAL; 2210 2211 mutex_lock(&rdev->mutex); 2212 ret = ops->list_voltage(rdev, selector); 2213 mutex_unlock(&rdev->mutex); 2214 2215 if (ret > 0) { 2216 if (ret < rdev->constraints->min_uV) 2217 ret = 0; 2218 else if (ret > rdev->constraints->max_uV) 2219 ret = 0; 2220 } 2221 2222 return ret; 2223} 2224EXPORT_SYMBOL_GPL(regulator_list_voltage); 2225 2226/** 2227 * regulator_get_linear_step - return the voltage step size between VSEL values 2228 * @regulator: regulator source 2229 * 2230 * Returns the voltage step size between VSEL values for linear 2231 * regulators, or return 0 if the regulator isn't a linear regulator. 2232 */ 2233unsigned int regulator_get_linear_step(struct regulator *regulator) 2234{ 2235 struct regulator_dev *rdev = regulator->rdev; 2236 2237 return rdev->desc->uV_step; 2238} 2239EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2240 2241/** 2242 * regulator_is_supported_voltage - check if a voltage range can be supported 2243 * 2244 * @regulator: Regulator to check. 2245 * @min_uV: Minimum required voltage in uV. 2246 * @max_uV: Maximum required voltage in uV. 2247 * 2248 * Returns a boolean or a negative error code. 2249 */ 2250int regulator_is_supported_voltage(struct regulator *regulator, 2251 int min_uV, int max_uV) 2252{ 2253 struct regulator_dev *rdev = regulator->rdev; 2254 int i, voltages, ret; 2255 2256 /* If we can't change voltage check the current voltage */ 2257 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2258 ret = regulator_get_voltage(regulator); 2259 if (ret >= 0) 2260 return min_uV <= ret && ret <= max_uV; 2261 else 2262 return ret; 2263 } 2264 2265 /* Any voltage within constrains range is fine? */ 2266 if (rdev->desc->continuous_voltage_range) 2267 return min_uV >= rdev->constraints->min_uV && 2268 max_uV <= rdev->constraints->max_uV; 2269 2270 ret = regulator_count_voltages(regulator); 2271 if (ret < 0) 2272 return ret; 2273 voltages = ret; 2274 2275 for (i = 0; i < voltages; i++) { 2276 ret = regulator_list_voltage(regulator, i); 2277 2278 if (ret >= min_uV && ret <= max_uV) 2279 return 1; 2280 } 2281 2282 return 0; 2283} 2284EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2285 2286static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2287 int min_uV, int max_uV) 2288{ 2289 int ret; 2290 int delay = 0; 2291 int best_val = 0; 2292 unsigned int selector; 2293 int old_selector = -1; 2294 2295 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2296 2297 min_uV += rdev->constraints->uV_offset; 2298 max_uV += rdev->constraints->uV_offset; 2299 2300 /* 2301 * If we can't obtain the old selector there is not enough 2302 * info to call set_voltage_time_sel(). 2303 */ 2304 if (_regulator_is_enabled(rdev) && 2305 rdev->desc->ops->set_voltage_time_sel && 2306 rdev->desc->ops->get_voltage_sel) { 2307 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2308 if (old_selector < 0) 2309 return old_selector; 2310 } 2311 2312 if (rdev->desc->ops->set_voltage) { 2313 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2314 &selector); 2315 2316 if (ret >= 0) { 2317 if (rdev->desc->ops->list_voltage) 2318 best_val = rdev->desc->ops->list_voltage(rdev, 2319 selector); 2320 else 2321 best_val = _regulator_get_voltage(rdev); 2322 } 2323 2324 } else if (rdev->desc->ops->set_voltage_sel) { 2325 if (rdev->desc->ops->map_voltage) { 2326 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2327 max_uV); 2328 } else { 2329 if (rdev->desc->ops->list_voltage == 2330 regulator_list_voltage_linear) 2331 ret = regulator_map_voltage_linear(rdev, 2332 min_uV, max_uV); 2333 else if (rdev->desc->ops->list_voltage == 2334 regulator_list_voltage_linear_range) 2335 ret = regulator_map_voltage_linear_range(rdev, 2336 min_uV, max_uV); 2337 else 2338 ret = regulator_map_voltage_iterate(rdev, 2339 min_uV, max_uV); 2340 } 2341 2342 if (ret >= 0) { 2343 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2344 if (min_uV <= best_val && max_uV >= best_val) { 2345 selector = ret; 2346 if (old_selector == selector) 2347 ret = 0; 2348 else 2349 ret = rdev->desc->ops->set_voltage_sel( 2350 rdev, ret); 2351 } else { 2352 ret = -EINVAL; 2353 } 2354 } 2355 } else { 2356 ret = -EINVAL; 2357 } 2358 2359 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2360 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2361 && old_selector != selector) { 2362 2363 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2364 old_selector, selector); 2365 if (delay < 0) { 2366 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2367 delay); 2368 delay = 0; 2369 } 2370 2371 /* Insert any necessary delays */ 2372 if (delay >= 1000) { 2373 mdelay(delay / 1000); 2374 udelay(delay % 1000); 2375 } else if (delay) { 2376 udelay(delay); 2377 } 2378 } 2379 2380 if (ret == 0 && best_val >= 0) { 2381 unsigned long data = best_val; 2382 2383 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2384 (void *)data); 2385 } 2386 2387 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2388 2389 return ret; 2390} 2391 2392/** 2393 * regulator_set_voltage - set regulator output voltage 2394 * @regulator: regulator source 2395 * @min_uV: Minimum required voltage in uV 2396 * @max_uV: Maximum acceptable voltage in uV 2397 * 2398 * Sets a voltage regulator to the desired output voltage. This can be set 2399 * during any regulator state. IOW, regulator can be disabled or enabled. 2400 * 2401 * If the regulator is enabled then the voltage will change to the new value 2402 * immediately otherwise if the regulator is disabled the regulator will 2403 * output at the new voltage when enabled. 2404 * 2405 * NOTE: If the regulator is shared between several devices then the lowest 2406 * request voltage that meets the system constraints will be used. 2407 * Regulator system constraints must be set for this regulator before 2408 * calling this function otherwise this call will fail. 2409 */ 2410int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2411{ 2412 struct regulator_dev *rdev = regulator->rdev; 2413 int ret = 0; 2414 int old_min_uV, old_max_uV; 2415 int current_uV; 2416 2417 mutex_lock(&rdev->mutex); 2418 2419 /* If we're setting the same range as last time the change 2420 * should be a noop (some cpufreq implementations use the same 2421 * voltage for multiple frequencies, for example). 2422 */ 2423 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2424 goto out; 2425 2426 /* If we're trying to set a range that overlaps the current voltage, 2427 * return succesfully even though the regulator does not support 2428 * changing the voltage. 2429 */ 2430 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2431 current_uV = _regulator_get_voltage(rdev); 2432 if (min_uV <= current_uV && current_uV <= max_uV) { 2433 regulator->min_uV = min_uV; 2434 regulator->max_uV = max_uV; 2435 goto out; 2436 } 2437 } 2438 2439 /* sanity check */ 2440 if (!rdev->desc->ops->set_voltage && 2441 !rdev->desc->ops->set_voltage_sel) { 2442 ret = -EINVAL; 2443 goto out; 2444 } 2445 2446 /* constraints check */ 2447 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2448 if (ret < 0) 2449 goto out; 2450 2451 /* restore original values in case of error */ 2452 old_min_uV = regulator->min_uV; 2453 old_max_uV = regulator->max_uV; 2454 regulator->min_uV = min_uV; 2455 regulator->max_uV = max_uV; 2456 2457 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2458 if (ret < 0) 2459 goto out2; 2460 2461 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2462 if (ret < 0) 2463 goto out2; 2464 2465out: 2466 mutex_unlock(&rdev->mutex); 2467 return ret; 2468out2: 2469 regulator->min_uV = old_min_uV; 2470 regulator->max_uV = old_max_uV; 2471 mutex_unlock(&rdev->mutex); 2472 return ret; 2473} 2474EXPORT_SYMBOL_GPL(regulator_set_voltage); 2475 2476/** 2477 * regulator_set_voltage_time - get raise/fall time 2478 * @regulator: regulator source 2479 * @old_uV: starting voltage in microvolts 2480 * @new_uV: target voltage in microvolts 2481 * 2482 * Provided with the starting and ending voltage, this function attempts to 2483 * calculate the time in microseconds required to rise or fall to this new 2484 * voltage. 2485 */ 2486int regulator_set_voltage_time(struct regulator *regulator, 2487 int old_uV, int new_uV) 2488{ 2489 struct regulator_dev *rdev = regulator->rdev; 2490 struct regulator_ops *ops = rdev->desc->ops; 2491 int old_sel = -1; 2492 int new_sel = -1; 2493 int voltage; 2494 int i; 2495 2496 /* Currently requires operations to do this */ 2497 if (!ops->list_voltage || !ops->set_voltage_time_sel 2498 || !rdev->desc->n_voltages) 2499 return -EINVAL; 2500 2501 for (i = 0; i < rdev->desc->n_voltages; i++) { 2502 /* We only look for exact voltage matches here */ 2503 voltage = regulator_list_voltage(regulator, i); 2504 if (voltage < 0) 2505 return -EINVAL; 2506 if (voltage == 0) 2507 continue; 2508 if (voltage == old_uV) 2509 old_sel = i; 2510 if (voltage == new_uV) 2511 new_sel = i; 2512 } 2513 2514 if (old_sel < 0 || new_sel < 0) 2515 return -EINVAL; 2516 2517 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2518} 2519EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2520 2521/** 2522 * regulator_set_voltage_time_sel - get raise/fall time 2523 * @rdev: regulator source device 2524 * @old_selector: selector for starting voltage 2525 * @new_selector: selector for target voltage 2526 * 2527 * Provided with the starting and target voltage selectors, this function 2528 * returns time in microseconds required to rise or fall to this new voltage 2529 * 2530 * Drivers providing ramp_delay in regulation_constraints can use this as their 2531 * set_voltage_time_sel() operation. 2532 */ 2533int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2534 unsigned int old_selector, 2535 unsigned int new_selector) 2536{ 2537 unsigned int ramp_delay = 0; 2538 int old_volt, new_volt; 2539 2540 if (rdev->constraints->ramp_delay) 2541 ramp_delay = rdev->constraints->ramp_delay; 2542 else if (rdev->desc->ramp_delay) 2543 ramp_delay = rdev->desc->ramp_delay; 2544 2545 if (ramp_delay == 0) { 2546 rdev_warn(rdev, "ramp_delay not set\n"); 2547 return 0; 2548 } 2549 2550 /* sanity check */ 2551 if (!rdev->desc->ops->list_voltage) 2552 return -EINVAL; 2553 2554 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2555 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2556 2557 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2558} 2559EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2560 2561/** 2562 * regulator_sync_voltage - re-apply last regulator output voltage 2563 * @regulator: regulator source 2564 * 2565 * Re-apply the last configured voltage. This is intended to be used 2566 * where some external control source the consumer is cooperating with 2567 * has caused the configured voltage to change. 2568 */ 2569int regulator_sync_voltage(struct regulator *regulator) 2570{ 2571 struct regulator_dev *rdev = regulator->rdev; 2572 int ret, min_uV, max_uV; 2573 2574 mutex_lock(&rdev->mutex); 2575 2576 if (!rdev->desc->ops->set_voltage && 2577 !rdev->desc->ops->set_voltage_sel) { 2578 ret = -EINVAL; 2579 goto out; 2580 } 2581 2582 /* This is only going to work if we've had a voltage configured. */ 2583 if (!regulator->min_uV && !regulator->max_uV) { 2584 ret = -EINVAL; 2585 goto out; 2586 } 2587 2588 min_uV = regulator->min_uV; 2589 max_uV = regulator->max_uV; 2590 2591 /* This should be a paranoia check... */ 2592 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2593 if (ret < 0) 2594 goto out; 2595 2596 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2597 if (ret < 0) 2598 goto out; 2599 2600 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2601 2602out: 2603 mutex_unlock(&rdev->mutex); 2604 return ret; 2605} 2606EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2607 2608static int _regulator_get_voltage(struct regulator_dev *rdev) 2609{ 2610 int sel, ret; 2611 2612 if (rdev->desc->ops->get_voltage_sel) { 2613 sel = rdev->desc->ops->get_voltage_sel(rdev); 2614 if (sel < 0) 2615 return sel; 2616 ret = rdev->desc->ops->list_voltage(rdev, sel); 2617 } else if (rdev->desc->ops->get_voltage) { 2618 ret = rdev->desc->ops->get_voltage(rdev); 2619 } else if (rdev->desc->ops->list_voltage) { 2620 ret = rdev->desc->ops->list_voltage(rdev, 0); 2621 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { 2622 ret = rdev->desc->fixed_uV; 2623 } else { 2624 return -EINVAL; 2625 } 2626 2627 if (ret < 0) 2628 return ret; 2629 return ret - rdev->constraints->uV_offset; 2630} 2631 2632/** 2633 * regulator_get_voltage - get regulator output voltage 2634 * @regulator: regulator source 2635 * 2636 * This returns the current regulator voltage in uV. 2637 * 2638 * NOTE: If the regulator is disabled it will return the voltage value. This 2639 * function should not be used to determine regulator state. 2640 */ 2641int regulator_get_voltage(struct regulator *regulator) 2642{ 2643 int ret; 2644 2645 mutex_lock(®ulator->rdev->mutex); 2646 2647 ret = _regulator_get_voltage(regulator->rdev); 2648 2649 mutex_unlock(®ulator->rdev->mutex); 2650 2651 return ret; 2652} 2653EXPORT_SYMBOL_GPL(regulator_get_voltage); 2654 2655/** 2656 * regulator_set_current_limit - set regulator output current limit 2657 * @regulator: regulator source 2658 * @min_uA: Minimum supported current in uA 2659 * @max_uA: Maximum supported current in uA 2660 * 2661 * Sets current sink to the desired output current. This can be set during 2662 * any regulator state. IOW, regulator can be disabled or enabled. 2663 * 2664 * If the regulator is enabled then the current will change to the new value 2665 * immediately otherwise if the regulator is disabled the regulator will 2666 * output at the new current when enabled. 2667 * 2668 * NOTE: Regulator system constraints must be set for this regulator before 2669 * calling this function otherwise this call will fail. 2670 */ 2671int regulator_set_current_limit(struct regulator *regulator, 2672 int min_uA, int max_uA) 2673{ 2674 struct regulator_dev *rdev = regulator->rdev; 2675 int ret; 2676 2677 mutex_lock(&rdev->mutex); 2678 2679 /* sanity check */ 2680 if (!rdev->desc->ops->set_current_limit) { 2681 ret = -EINVAL; 2682 goto out; 2683 } 2684 2685 /* constraints check */ 2686 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2687 if (ret < 0) 2688 goto out; 2689 2690 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2691out: 2692 mutex_unlock(&rdev->mutex); 2693 return ret; 2694} 2695EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2696 2697static int _regulator_get_current_limit(struct regulator_dev *rdev) 2698{ 2699 int ret; 2700 2701 mutex_lock(&rdev->mutex); 2702 2703 /* sanity check */ 2704 if (!rdev->desc->ops->get_current_limit) { 2705 ret = -EINVAL; 2706 goto out; 2707 } 2708 2709 ret = rdev->desc->ops->get_current_limit(rdev); 2710out: 2711 mutex_unlock(&rdev->mutex); 2712 return ret; 2713} 2714 2715/** 2716 * regulator_get_current_limit - get regulator output current 2717 * @regulator: regulator source 2718 * 2719 * This returns the current supplied by the specified current sink in uA. 2720 * 2721 * NOTE: If the regulator is disabled it will return the current value. This 2722 * function should not be used to determine regulator state. 2723 */ 2724int regulator_get_current_limit(struct regulator *regulator) 2725{ 2726 return _regulator_get_current_limit(regulator->rdev); 2727} 2728EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2729 2730/** 2731 * regulator_set_mode - set regulator operating mode 2732 * @regulator: regulator source 2733 * @mode: operating mode - one of the REGULATOR_MODE constants 2734 * 2735 * Set regulator operating mode to increase regulator efficiency or improve 2736 * regulation performance. 2737 * 2738 * NOTE: Regulator system constraints must be set for this regulator before 2739 * calling this function otherwise this call will fail. 2740 */ 2741int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2742{ 2743 struct regulator_dev *rdev = regulator->rdev; 2744 int ret; 2745 int regulator_curr_mode; 2746 2747 mutex_lock(&rdev->mutex); 2748 2749 /* sanity check */ 2750 if (!rdev->desc->ops->set_mode) { 2751 ret = -EINVAL; 2752 goto out; 2753 } 2754 2755 /* return if the same mode is requested */ 2756 if (rdev->desc->ops->get_mode) { 2757 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2758 if (regulator_curr_mode == mode) { 2759 ret = 0; 2760 goto out; 2761 } 2762 } 2763 2764 /* constraints check */ 2765 ret = regulator_mode_constrain(rdev, &mode); 2766 if (ret < 0) 2767 goto out; 2768 2769 ret = rdev->desc->ops->set_mode(rdev, mode); 2770out: 2771 mutex_unlock(&rdev->mutex); 2772 return ret; 2773} 2774EXPORT_SYMBOL_GPL(regulator_set_mode); 2775 2776static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2777{ 2778 int ret; 2779 2780 mutex_lock(&rdev->mutex); 2781 2782 /* sanity check */ 2783 if (!rdev->desc->ops->get_mode) { 2784 ret = -EINVAL; 2785 goto out; 2786 } 2787 2788 ret = rdev->desc->ops->get_mode(rdev); 2789out: 2790 mutex_unlock(&rdev->mutex); 2791 return ret; 2792} 2793 2794/** 2795 * regulator_get_mode - get regulator operating mode 2796 * @regulator: regulator source 2797 * 2798 * Get the current regulator operating mode. 2799 */ 2800unsigned int regulator_get_mode(struct regulator *regulator) 2801{ 2802 return _regulator_get_mode(regulator->rdev); 2803} 2804EXPORT_SYMBOL_GPL(regulator_get_mode); 2805 2806/** 2807 * regulator_set_optimum_mode - set regulator optimum operating mode 2808 * @regulator: regulator source 2809 * @uA_load: load current 2810 * 2811 * Notifies the regulator core of a new device load. This is then used by 2812 * DRMS (if enabled by constraints) to set the most efficient regulator 2813 * operating mode for the new regulator loading. 2814 * 2815 * Consumer devices notify their supply regulator of the maximum power 2816 * they will require (can be taken from device datasheet in the power 2817 * consumption tables) when they change operational status and hence power 2818 * state. Examples of operational state changes that can affect power 2819 * consumption are :- 2820 * 2821 * o Device is opened / closed. 2822 * o Device I/O is about to begin or has just finished. 2823 * o Device is idling in between work. 2824 * 2825 * This information is also exported via sysfs to userspace. 2826 * 2827 * DRMS will sum the total requested load on the regulator and change 2828 * to the most efficient operating mode if platform constraints allow. 2829 * 2830 * Returns the new regulator mode or error. 2831 */ 2832int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2833{ 2834 struct regulator_dev *rdev = regulator->rdev; 2835 struct regulator *consumer; 2836 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2837 unsigned int mode; 2838 2839 if (rdev->supply) 2840 input_uV = regulator_get_voltage(rdev->supply); 2841 2842 mutex_lock(&rdev->mutex); 2843 2844 /* 2845 * first check to see if we can set modes at all, otherwise just 2846 * tell the consumer everything is OK. 2847 */ 2848 regulator->uA_load = uA_load; 2849 ret = regulator_check_drms(rdev); 2850 if (ret < 0) { 2851 ret = 0; 2852 goto out; 2853 } 2854 2855 if (!rdev->desc->ops->get_optimum_mode) 2856 goto out; 2857 2858 /* 2859 * we can actually do this so any errors are indicators of 2860 * potential real failure. 2861 */ 2862 ret = -EINVAL; 2863 2864 if (!rdev->desc->ops->set_mode) 2865 goto out; 2866 2867 /* get output voltage */ 2868 output_uV = _regulator_get_voltage(rdev); 2869 if (output_uV <= 0) { 2870 rdev_err(rdev, "invalid output voltage found\n"); 2871 goto out; 2872 } 2873 2874 /* No supply? Use constraint voltage */ 2875 if (input_uV <= 0) 2876 input_uV = rdev->constraints->input_uV; 2877 if (input_uV <= 0) { 2878 rdev_err(rdev, "invalid input voltage found\n"); 2879 goto out; 2880 } 2881 2882 /* calc total requested load for this regulator */ 2883 list_for_each_entry(consumer, &rdev->consumer_list, list) 2884 total_uA_load += consumer->uA_load; 2885 2886 mode = rdev->desc->ops->get_optimum_mode(rdev, 2887 input_uV, output_uV, 2888 total_uA_load); 2889 ret = regulator_mode_constrain(rdev, &mode); 2890 if (ret < 0) { 2891 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2892 total_uA_load, input_uV, output_uV); 2893 goto out; 2894 } 2895 2896 ret = rdev->desc->ops->set_mode(rdev, mode); 2897 if (ret < 0) { 2898 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2899 goto out; 2900 } 2901 ret = mode; 2902out: 2903 mutex_unlock(&rdev->mutex); 2904 return ret; 2905} 2906EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2907 2908/** 2909 * regulator_allow_bypass - allow the regulator to go into bypass mode 2910 * 2911 * @regulator: Regulator to configure 2912 * @enable: enable or disable bypass mode 2913 * 2914 * Allow the regulator to go into bypass mode if all other consumers 2915 * for the regulator also enable bypass mode and the machine 2916 * constraints allow this. Bypass mode means that the regulator is 2917 * simply passing the input directly to the output with no regulation. 2918 */ 2919int regulator_allow_bypass(struct regulator *regulator, bool enable) 2920{ 2921 struct regulator_dev *rdev = regulator->rdev; 2922 int ret = 0; 2923 2924 if (!rdev->desc->ops->set_bypass) 2925 return 0; 2926 2927 if (rdev->constraints && 2928 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2929 return 0; 2930 2931 mutex_lock(&rdev->mutex); 2932 2933 if (enable && !regulator->bypass) { 2934 rdev->bypass_count++; 2935 2936 if (rdev->bypass_count == rdev->open_count) { 2937 ret = rdev->desc->ops->set_bypass(rdev, enable); 2938 if (ret != 0) 2939 rdev->bypass_count--; 2940 } 2941 2942 } else if (!enable && regulator->bypass) { 2943 rdev->bypass_count--; 2944 2945 if (rdev->bypass_count != rdev->open_count) { 2946 ret = rdev->desc->ops->set_bypass(rdev, enable); 2947 if (ret != 0) 2948 rdev->bypass_count++; 2949 } 2950 } 2951 2952 if (ret == 0) 2953 regulator->bypass = enable; 2954 2955 mutex_unlock(&rdev->mutex); 2956 2957 return ret; 2958} 2959EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2960 2961/** 2962 * regulator_register_notifier - register regulator event notifier 2963 * @regulator: regulator source 2964 * @nb: notifier block 2965 * 2966 * Register notifier block to receive regulator events. 2967 */ 2968int regulator_register_notifier(struct regulator *regulator, 2969 struct notifier_block *nb) 2970{ 2971 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2972 nb); 2973} 2974EXPORT_SYMBOL_GPL(regulator_register_notifier); 2975 2976/** 2977 * regulator_unregister_notifier - unregister regulator event notifier 2978 * @regulator: regulator source 2979 * @nb: notifier block 2980 * 2981 * Unregister regulator event notifier block. 2982 */ 2983int regulator_unregister_notifier(struct regulator *regulator, 2984 struct notifier_block *nb) 2985{ 2986 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2987 nb); 2988} 2989EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2990 2991/* notify regulator consumers and downstream regulator consumers. 2992 * Note mutex must be held by caller. 2993 */ 2994static void _notifier_call_chain(struct regulator_dev *rdev, 2995 unsigned long event, void *data) 2996{ 2997 /* call rdev chain first */ 2998 blocking_notifier_call_chain(&rdev->notifier, event, data); 2999} 3000 3001/** 3002 * regulator_bulk_get - get multiple regulator consumers 3003 * 3004 * @dev: Device to supply 3005 * @num_consumers: Number of consumers to register 3006 * @consumers: Configuration of consumers; clients are stored here. 3007 * 3008 * @return 0 on success, an errno on failure. 3009 * 3010 * This helper function allows drivers to get several regulator 3011 * consumers in one operation. If any of the regulators cannot be 3012 * acquired then any regulators that were allocated will be freed 3013 * before returning to the caller. 3014 */ 3015int regulator_bulk_get(struct device *dev, int num_consumers, 3016 struct regulator_bulk_data *consumers) 3017{ 3018 int i; 3019 int ret; 3020 3021 for (i = 0; i < num_consumers; i++) 3022 consumers[i].consumer = NULL; 3023 3024 for (i = 0; i < num_consumers; i++) { 3025 consumers[i].consumer = regulator_get(dev, 3026 consumers[i].supply); 3027 if (IS_ERR(consumers[i].consumer)) { 3028 ret = PTR_ERR(consumers[i].consumer); 3029 dev_err(dev, "Failed to get supply '%s': %d\n", 3030 consumers[i].supply, ret); 3031 consumers[i].consumer = NULL; 3032 goto err; 3033 } 3034 } 3035 3036 return 0; 3037 3038err: 3039 while (--i >= 0) 3040 regulator_put(consumers[i].consumer); 3041 3042 return ret; 3043} 3044EXPORT_SYMBOL_GPL(regulator_bulk_get); 3045 3046static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3047{ 3048 struct regulator_bulk_data *bulk = data; 3049 3050 bulk->ret = regulator_enable(bulk->consumer); 3051} 3052 3053/** 3054 * regulator_bulk_enable - enable multiple regulator consumers 3055 * 3056 * @num_consumers: Number of consumers 3057 * @consumers: Consumer data; clients are stored here. 3058 * @return 0 on success, an errno on failure 3059 * 3060 * This convenience API allows consumers to enable multiple regulator 3061 * clients in a single API call. If any consumers cannot be enabled 3062 * then any others that were enabled will be disabled again prior to 3063 * return. 3064 */ 3065int regulator_bulk_enable(int num_consumers, 3066 struct regulator_bulk_data *consumers) 3067{ 3068 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3069 int i; 3070 int ret = 0; 3071 3072 for (i = 0; i < num_consumers; i++) { 3073 if (consumers[i].consumer->always_on) 3074 consumers[i].ret = 0; 3075 else 3076 async_schedule_domain(regulator_bulk_enable_async, 3077 &consumers[i], &async_domain); 3078 } 3079 3080 async_synchronize_full_domain(&async_domain); 3081 3082 /* If any consumer failed we need to unwind any that succeeded */ 3083 for (i = 0; i < num_consumers; i++) { 3084 if (consumers[i].ret != 0) { 3085 ret = consumers[i].ret; 3086 goto err; 3087 } 3088 } 3089 3090 return 0; 3091 3092err: 3093 for (i = 0; i < num_consumers; i++) { 3094 if (consumers[i].ret < 0) 3095 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3096 consumers[i].ret); 3097 else 3098 regulator_disable(consumers[i].consumer); 3099 } 3100 3101 return ret; 3102} 3103EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3104 3105/** 3106 * regulator_bulk_disable - disable multiple regulator consumers 3107 * 3108 * @num_consumers: Number of consumers 3109 * @consumers: Consumer data; clients are stored here. 3110 * @return 0 on success, an errno on failure 3111 * 3112 * This convenience API allows consumers to disable multiple regulator 3113 * clients in a single API call. If any consumers cannot be disabled 3114 * then any others that were disabled will be enabled again prior to 3115 * return. 3116 */ 3117int regulator_bulk_disable(int num_consumers, 3118 struct regulator_bulk_data *consumers) 3119{ 3120 int i; 3121 int ret, r; 3122 3123 for (i = num_consumers - 1; i >= 0; --i) { 3124 ret = regulator_disable(consumers[i].consumer); 3125 if (ret != 0) 3126 goto err; 3127 } 3128 3129 return 0; 3130 3131err: 3132 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3133 for (++i; i < num_consumers; ++i) { 3134 r = regulator_enable(consumers[i].consumer); 3135 if (r != 0) 3136 pr_err("Failed to reename %s: %d\n", 3137 consumers[i].supply, r); 3138 } 3139 3140 return ret; 3141} 3142EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3143 3144/** 3145 * regulator_bulk_force_disable - force disable multiple regulator consumers 3146 * 3147 * @num_consumers: Number of consumers 3148 * @consumers: Consumer data; clients are stored here. 3149 * @return 0 on success, an errno on failure 3150 * 3151 * This convenience API allows consumers to forcibly disable multiple regulator 3152 * clients in a single API call. 3153 * NOTE: This should be used for situations when device damage will 3154 * likely occur if the regulators are not disabled (e.g. over temp). 3155 * Although regulator_force_disable function call for some consumers can 3156 * return error numbers, the function is called for all consumers. 3157 */ 3158int regulator_bulk_force_disable(int num_consumers, 3159 struct regulator_bulk_data *consumers) 3160{ 3161 int i; 3162 int ret; 3163 3164 for (i = 0; i < num_consumers; i++) 3165 consumers[i].ret = 3166 regulator_force_disable(consumers[i].consumer); 3167 3168 for (i = 0; i < num_consumers; i++) { 3169 if (consumers[i].ret != 0) { 3170 ret = consumers[i].ret; 3171 goto out; 3172 } 3173 } 3174 3175 return 0; 3176out: 3177 return ret; 3178} 3179EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3180 3181/** 3182 * regulator_bulk_free - free multiple regulator consumers 3183 * 3184 * @num_consumers: Number of consumers 3185 * @consumers: Consumer data; clients are stored here. 3186 * 3187 * This convenience API allows consumers to free multiple regulator 3188 * clients in a single API call. 3189 */ 3190void regulator_bulk_free(int num_consumers, 3191 struct regulator_bulk_data *consumers) 3192{ 3193 int i; 3194 3195 for (i = 0; i < num_consumers; i++) { 3196 regulator_put(consumers[i].consumer); 3197 consumers[i].consumer = NULL; 3198 } 3199} 3200EXPORT_SYMBOL_GPL(regulator_bulk_free); 3201 3202/** 3203 * regulator_notifier_call_chain - call regulator event notifier 3204 * @rdev: regulator source 3205 * @event: notifier block 3206 * @data: callback-specific data. 3207 * 3208 * Called by regulator drivers to notify clients a regulator event has 3209 * occurred. We also notify regulator clients downstream. 3210 * Note lock must be held by caller. 3211 */ 3212int regulator_notifier_call_chain(struct regulator_dev *rdev, 3213 unsigned long event, void *data) 3214{ 3215 _notifier_call_chain(rdev, event, data); 3216 return NOTIFY_DONE; 3217 3218} 3219EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3220 3221/** 3222 * regulator_mode_to_status - convert a regulator mode into a status 3223 * 3224 * @mode: Mode to convert 3225 * 3226 * Convert a regulator mode into a status. 3227 */ 3228int regulator_mode_to_status(unsigned int mode) 3229{ 3230 switch (mode) { 3231 case REGULATOR_MODE_FAST: 3232 return REGULATOR_STATUS_FAST; 3233 case REGULATOR_MODE_NORMAL: 3234 return REGULATOR_STATUS_NORMAL; 3235 case REGULATOR_MODE_IDLE: 3236 return REGULATOR_STATUS_IDLE; 3237 case REGULATOR_MODE_STANDBY: 3238 return REGULATOR_STATUS_STANDBY; 3239 default: 3240 return REGULATOR_STATUS_UNDEFINED; 3241 } 3242} 3243EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3244 3245/* 3246 * To avoid cluttering sysfs (and memory) with useless state, only 3247 * create attributes that can be meaningfully displayed. 3248 */ 3249static int add_regulator_attributes(struct regulator_dev *rdev) 3250{ 3251 struct device *dev = &rdev->dev; 3252 struct regulator_ops *ops = rdev->desc->ops; 3253 int status = 0; 3254 3255 /* some attributes need specific methods to be displayed */ 3256 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3257 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3258 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || 3259 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { 3260 status = device_create_file(dev, &dev_attr_microvolts); 3261 if (status < 0) 3262 return status; 3263 } 3264 if (ops->get_current_limit) { 3265 status = device_create_file(dev, &dev_attr_microamps); 3266 if (status < 0) 3267 return status; 3268 } 3269 if (ops->get_mode) { 3270 status = device_create_file(dev, &dev_attr_opmode); 3271 if (status < 0) 3272 return status; 3273 } 3274 if (rdev->ena_pin || ops->is_enabled) { 3275 status = device_create_file(dev, &dev_attr_state); 3276 if (status < 0) 3277 return status; 3278 } 3279 if (ops->get_status) { 3280 status = device_create_file(dev, &dev_attr_status); 3281 if (status < 0) 3282 return status; 3283 } 3284 if (ops->get_bypass) { 3285 status = device_create_file(dev, &dev_attr_bypass); 3286 if (status < 0) 3287 return status; 3288 } 3289 3290 /* some attributes are type-specific */ 3291 if (rdev->desc->type == REGULATOR_CURRENT) { 3292 status = device_create_file(dev, &dev_attr_requested_microamps); 3293 if (status < 0) 3294 return status; 3295 } 3296 3297 /* all the other attributes exist to support constraints; 3298 * don't show them if there are no constraints, or if the 3299 * relevant supporting methods are missing. 3300 */ 3301 if (!rdev->constraints) 3302 return status; 3303 3304 /* constraints need specific supporting methods */ 3305 if (ops->set_voltage || ops->set_voltage_sel) { 3306 status = device_create_file(dev, &dev_attr_min_microvolts); 3307 if (status < 0) 3308 return status; 3309 status = device_create_file(dev, &dev_attr_max_microvolts); 3310 if (status < 0) 3311 return status; 3312 } 3313 if (ops->set_current_limit) { 3314 status = device_create_file(dev, &dev_attr_min_microamps); 3315 if (status < 0) 3316 return status; 3317 status = device_create_file(dev, &dev_attr_max_microamps); 3318 if (status < 0) 3319 return status; 3320 } 3321 3322 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3323 if (status < 0) 3324 return status; 3325 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3326 if (status < 0) 3327 return status; 3328 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3329 if (status < 0) 3330 return status; 3331 3332 if (ops->set_suspend_voltage) { 3333 status = device_create_file(dev, 3334 &dev_attr_suspend_standby_microvolts); 3335 if (status < 0) 3336 return status; 3337 status = device_create_file(dev, 3338 &dev_attr_suspend_mem_microvolts); 3339 if (status < 0) 3340 return status; 3341 status = device_create_file(dev, 3342 &dev_attr_suspend_disk_microvolts); 3343 if (status < 0) 3344 return status; 3345 } 3346 3347 if (ops->set_suspend_mode) { 3348 status = device_create_file(dev, 3349 &dev_attr_suspend_standby_mode); 3350 if (status < 0) 3351 return status; 3352 status = device_create_file(dev, 3353 &dev_attr_suspend_mem_mode); 3354 if (status < 0) 3355 return status; 3356 status = device_create_file(dev, 3357 &dev_attr_suspend_disk_mode); 3358 if (status < 0) 3359 return status; 3360 } 3361 3362 return status; 3363} 3364 3365static void rdev_init_debugfs(struct regulator_dev *rdev) 3366{ 3367 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3368 if (!rdev->debugfs) { 3369 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3370 return; 3371 } 3372 3373 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3374 &rdev->use_count); 3375 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3376 &rdev->open_count); 3377 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3378 &rdev->bypass_count); 3379} 3380 3381/** 3382 * regulator_register - register regulator 3383 * @regulator_desc: regulator to register 3384 * @config: runtime configuration for regulator 3385 * 3386 * Called by regulator drivers to register a regulator. 3387 * Returns a valid pointer to struct regulator_dev on success 3388 * or an ERR_PTR() on error. 3389 */ 3390struct regulator_dev * 3391regulator_register(const struct regulator_desc *regulator_desc, 3392 const struct regulator_config *config) 3393{ 3394 const struct regulation_constraints *constraints = NULL; 3395 const struct regulator_init_data *init_data; 3396 static atomic_t regulator_no = ATOMIC_INIT(0); 3397 struct regulator_dev *rdev; 3398 struct device *dev; 3399 int ret, i; 3400 const char *supply = NULL; 3401 3402 if (regulator_desc == NULL || config == NULL) 3403 return ERR_PTR(-EINVAL); 3404 3405 dev = config->dev; 3406 WARN_ON(!dev); 3407 3408 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3409 return ERR_PTR(-EINVAL); 3410 3411 if (regulator_desc->type != REGULATOR_VOLTAGE && 3412 regulator_desc->type != REGULATOR_CURRENT) 3413 return ERR_PTR(-EINVAL); 3414 3415 /* Only one of each should be implemented */ 3416 WARN_ON(regulator_desc->ops->get_voltage && 3417 regulator_desc->ops->get_voltage_sel); 3418 WARN_ON(regulator_desc->ops->set_voltage && 3419 regulator_desc->ops->set_voltage_sel); 3420 3421 /* If we're using selectors we must implement list_voltage. */ 3422 if (regulator_desc->ops->get_voltage_sel && 3423 !regulator_desc->ops->list_voltage) { 3424 return ERR_PTR(-EINVAL); 3425 } 3426 if (regulator_desc->ops->set_voltage_sel && 3427 !regulator_desc->ops->list_voltage) { 3428 return ERR_PTR(-EINVAL); 3429 } 3430 3431 init_data = config->init_data; 3432 3433 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3434 if (rdev == NULL) 3435 return ERR_PTR(-ENOMEM); 3436 3437 mutex_lock(®ulator_list_mutex); 3438 3439 mutex_init(&rdev->mutex); 3440 rdev->reg_data = config->driver_data; 3441 rdev->owner = regulator_desc->owner; 3442 rdev->desc = regulator_desc; 3443 if (config->regmap) 3444 rdev->regmap = config->regmap; 3445 else if (dev_get_regmap(dev, NULL)) 3446 rdev->regmap = dev_get_regmap(dev, NULL); 3447 else if (dev->parent) 3448 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3449 INIT_LIST_HEAD(&rdev->consumer_list); 3450 INIT_LIST_HEAD(&rdev->list); 3451 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3452 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3453 3454 /* preform any regulator specific init */ 3455 if (init_data && init_data->regulator_init) { 3456 ret = init_data->regulator_init(rdev->reg_data); 3457 if (ret < 0) 3458 goto clean; 3459 } 3460 3461 /* register with sysfs */ 3462 rdev->dev.class = ®ulator_class; 3463 rdev->dev.of_node = of_node_get(config->of_node); 3464 rdev->dev.parent = dev; 3465 dev_set_name(&rdev->dev, "regulator.%d", 3466 atomic_inc_return(®ulator_no) - 1); 3467 ret = device_register(&rdev->dev); 3468 if (ret != 0) { 3469 put_device(&rdev->dev); 3470 goto clean; 3471 } 3472 3473 dev_set_drvdata(&rdev->dev, rdev); 3474 3475 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3476 ret = regulator_ena_gpio_request(rdev, config); 3477 if (ret != 0) { 3478 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3479 config->ena_gpio, ret); 3480 goto wash; 3481 } 3482 3483 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3484 rdev->ena_gpio_state = 1; 3485 3486 if (config->ena_gpio_invert) 3487 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3488 } 3489 3490 /* set regulator constraints */ 3491 if (init_data) 3492 constraints = &init_data->constraints; 3493 3494 ret = set_machine_constraints(rdev, constraints); 3495 if (ret < 0) 3496 goto scrub; 3497 3498 /* add attributes supported by this regulator */ 3499 ret = add_regulator_attributes(rdev); 3500 if (ret < 0) 3501 goto scrub; 3502 3503 if (init_data && init_data->supply_regulator) 3504 supply = init_data->supply_regulator; 3505 else if (regulator_desc->supply_name) 3506 supply = regulator_desc->supply_name; 3507 3508 if (supply) { 3509 struct regulator_dev *r; 3510 3511 r = regulator_dev_lookup(dev, supply, &ret); 3512 3513 if (ret == -ENODEV) { 3514 /* 3515 * No supply was specified for this regulator and 3516 * there will never be one. 3517 */ 3518 ret = 0; 3519 goto add_dev; 3520 } else if (!r) { 3521 dev_err(dev, "Failed to find supply %s\n", supply); 3522 ret = -EPROBE_DEFER; 3523 goto scrub; 3524 } 3525 3526 ret = set_supply(rdev, r); 3527 if (ret < 0) 3528 goto scrub; 3529 3530 /* Enable supply if rail is enabled */ 3531 if (_regulator_is_enabled(rdev)) { 3532 ret = regulator_enable(rdev->supply); 3533 if (ret < 0) 3534 goto scrub; 3535 } 3536 } 3537 3538add_dev: 3539 /* add consumers devices */ 3540 if (init_data) { 3541 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3542 ret = set_consumer_device_supply(rdev, 3543 init_data->consumer_supplies[i].dev_name, 3544 init_data->consumer_supplies[i].supply); 3545 if (ret < 0) { 3546 dev_err(dev, "Failed to set supply %s\n", 3547 init_data->consumer_supplies[i].supply); 3548 goto unset_supplies; 3549 } 3550 } 3551 } 3552 3553 list_add(&rdev->list, ®ulator_list); 3554 3555 rdev_init_debugfs(rdev); 3556out: 3557 mutex_unlock(®ulator_list_mutex); 3558 return rdev; 3559 3560unset_supplies: 3561 unset_regulator_supplies(rdev); 3562 3563scrub: 3564 if (rdev->supply) 3565 _regulator_put(rdev->supply); 3566 regulator_ena_gpio_free(rdev); 3567 kfree(rdev->constraints); 3568wash: 3569 device_unregister(&rdev->dev); 3570 /* device core frees rdev */ 3571 rdev = ERR_PTR(ret); 3572 goto out; 3573 3574clean: 3575 kfree(rdev); 3576 rdev = ERR_PTR(ret); 3577 goto out; 3578} 3579EXPORT_SYMBOL_GPL(regulator_register); 3580 3581/** 3582 * regulator_unregister - unregister regulator 3583 * @rdev: regulator to unregister 3584 * 3585 * Called by regulator drivers to unregister a regulator. 3586 */ 3587void regulator_unregister(struct regulator_dev *rdev) 3588{ 3589 if (rdev == NULL) 3590 return; 3591 3592 if (rdev->supply) { 3593 while (rdev->use_count--) 3594 regulator_disable(rdev->supply); 3595 regulator_put(rdev->supply); 3596 } 3597 mutex_lock(®ulator_list_mutex); 3598 debugfs_remove_recursive(rdev->debugfs); 3599 flush_work(&rdev->disable_work.work); 3600 WARN_ON(rdev->open_count); 3601 unset_regulator_supplies(rdev); 3602 list_del(&rdev->list); 3603 kfree(rdev->constraints); 3604 regulator_ena_gpio_free(rdev); 3605 of_node_put(rdev->dev.of_node); 3606 device_unregister(&rdev->dev); 3607 mutex_unlock(®ulator_list_mutex); 3608} 3609EXPORT_SYMBOL_GPL(regulator_unregister); 3610 3611/** 3612 * regulator_suspend_prepare - prepare regulators for system wide suspend 3613 * @state: system suspend state 3614 * 3615 * Configure each regulator with it's suspend operating parameters for state. 3616 * This will usually be called by machine suspend code prior to supending. 3617 */ 3618int regulator_suspend_prepare(suspend_state_t state) 3619{ 3620 struct regulator_dev *rdev; 3621 int ret = 0; 3622 3623 /* ON is handled by regulator active state */ 3624 if (state == PM_SUSPEND_ON) 3625 return -EINVAL; 3626 3627 mutex_lock(®ulator_list_mutex); 3628 list_for_each_entry(rdev, ®ulator_list, list) { 3629 3630 mutex_lock(&rdev->mutex); 3631 ret = suspend_prepare(rdev, state); 3632 mutex_unlock(&rdev->mutex); 3633 3634 if (ret < 0) { 3635 rdev_err(rdev, "failed to prepare\n"); 3636 goto out; 3637 } 3638 } 3639out: 3640 mutex_unlock(®ulator_list_mutex); 3641 return ret; 3642} 3643EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3644 3645/** 3646 * regulator_suspend_finish - resume regulators from system wide suspend 3647 * 3648 * Turn on regulators that might be turned off by regulator_suspend_prepare 3649 * and that should be turned on according to the regulators properties. 3650 */ 3651int regulator_suspend_finish(void) 3652{ 3653 struct regulator_dev *rdev; 3654 int ret = 0, error; 3655 3656 mutex_lock(®ulator_list_mutex); 3657 list_for_each_entry(rdev, ®ulator_list, list) { 3658 mutex_lock(&rdev->mutex); 3659 if (rdev->use_count > 0 || rdev->constraints->always_on) { 3660 error = _regulator_do_enable(rdev); 3661 if (error) 3662 ret = error; 3663 } else { 3664 if (!have_full_constraints()) 3665 goto unlock; 3666 if (!_regulator_is_enabled(rdev)) 3667 goto unlock; 3668 3669 error = _regulator_do_disable(rdev); 3670 if (error) 3671 ret = error; 3672 } 3673unlock: 3674 mutex_unlock(&rdev->mutex); 3675 } 3676 mutex_unlock(®ulator_list_mutex); 3677 return ret; 3678} 3679EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3680 3681/** 3682 * regulator_has_full_constraints - the system has fully specified constraints 3683 * 3684 * Calling this function will cause the regulator API to disable all 3685 * regulators which have a zero use count and don't have an always_on 3686 * constraint in a late_initcall. 3687 * 3688 * The intention is that this will become the default behaviour in a 3689 * future kernel release so users are encouraged to use this facility 3690 * now. 3691 */ 3692void regulator_has_full_constraints(void) 3693{ 3694 has_full_constraints = 1; 3695} 3696EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3697 3698/** 3699 * rdev_get_drvdata - get rdev regulator driver data 3700 * @rdev: regulator 3701 * 3702 * Get rdev regulator driver private data. This call can be used in the 3703 * regulator driver context. 3704 */ 3705void *rdev_get_drvdata(struct regulator_dev *rdev) 3706{ 3707 return rdev->reg_data; 3708} 3709EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3710 3711/** 3712 * regulator_get_drvdata - get regulator driver data 3713 * @regulator: regulator 3714 * 3715 * Get regulator driver private data. This call can be used in the consumer 3716 * driver context when non API regulator specific functions need to be called. 3717 */ 3718void *regulator_get_drvdata(struct regulator *regulator) 3719{ 3720 return regulator->rdev->reg_data; 3721} 3722EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3723 3724/** 3725 * regulator_set_drvdata - set regulator driver data 3726 * @regulator: regulator 3727 * @data: data 3728 */ 3729void regulator_set_drvdata(struct regulator *regulator, void *data) 3730{ 3731 regulator->rdev->reg_data = data; 3732} 3733EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3734 3735/** 3736 * regulator_get_id - get regulator ID 3737 * @rdev: regulator 3738 */ 3739int rdev_get_id(struct regulator_dev *rdev) 3740{ 3741 return rdev->desc->id; 3742} 3743EXPORT_SYMBOL_GPL(rdev_get_id); 3744 3745struct device *rdev_get_dev(struct regulator_dev *rdev) 3746{ 3747 return &rdev->dev; 3748} 3749EXPORT_SYMBOL_GPL(rdev_get_dev); 3750 3751void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3752{ 3753 return reg_init_data->driver_data; 3754} 3755EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3756 3757#ifdef CONFIG_DEBUG_FS 3758static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3759 size_t count, loff_t *ppos) 3760{ 3761 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3762 ssize_t len, ret = 0; 3763 struct regulator_map *map; 3764 3765 if (!buf) 3766 return -ENOMEM; 3767 3768 list_for_each_entry(map, ®ulator_map_list, list) { 3769 len = snprintf(buf + ret, PAGE_SIZE - ret, 3770 "%s -> %s.%s\n", 3771 rdev_get_name(map->regulator), map->dev_name, 3772 map->supply); 3773 if (len >= 0) 3774 ret += len; 3775 if (ret > PAGE_SIZE) { 3776 ret = PAGE_SIZE; 3777 break; 3778 } 3779 } 3780 3781 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3782 3783 kfree(buf); 3784 3785 return ret; 3786} 3787#endif 3788 3789static const struct file_operations supply_map_fops = { 3790#ifdef CONFIG_DEBUG_FS 3791 .read = supply_map_read_file, 3792 .llseek = default_llseek, 3793#endif 3794}; 3795 3796static int __init regulator_init(void) 3797{ 3798 int ret; 3799 3800 ret = class_register(®ulator_class); 3801 3802 debugfs_root = debugfs_create_dir("regulator", NULL); 3803 if (!debugfs_root) 3804 pr_warn("regulator: Failed to create debugfs directory\n"); 3805 3806 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3807 &supply_map_fops); 3808 3809 regulator_dummy_init(); 3810 3811 return ret; 3812} 3813 3814/* init early to allow our consumers to complete system booting */ 3815core_initcall(regulator_init); 3816 3817static int __init regulator_init_complete(void) 3818{ 3819 struct regulator_dev *rdev; 3820 struct regulator_ops *ops; 3821 struct regulation_constraints *c; 3822 int enabled, ret; 3823 3824 /* 3825 * Since DT doesn't provide an idiomatic mechanism for 3826 * enabling full constraints and since it's much more natural 3827 * with DT to provide them just assume that a DT enabled 3828 * system has full constraints. 3829 */ 3830 if (of_have_populated_dt()) 3831 has_full_constraints = true; 3832 3833 mutex_lock(®ulator_list_mutex); 3834 3835 /* If we have a full configuration then disable any regulators 3836 * we have permission to change the status for and which are 3837 * not in use or always_on. This is effectively the default 3838 * for DT and ACPI as they have full constraints. 3839 */ 3840 list_for_each_entry(rdev, ®ulator_list, list) { 3841 ops = rdev->desc->ops; 3842 c = rdev->constraints; 3843 3844 if (c && c->always_on) 3845 continue; 3846 3847 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) 3848 continue; 3849 3850 mutex_lock(&rdev->mutex); 3851 3852 if (rdev->use_count) 3853 goto unlock; 3854 3855 /* If we can't read the status assume it's on. */ 3856 if (ops->is_enabled) 3857 enabled = ops->is_enabled(rdev); 3858 else 3859 enabled = 1; 3860 3861 if (!enabled) 3862 goto unlock; 3863 3864 if (have_full_constraints()) { 3865 /* We log since this may kill the system if it 3866 * goes wrong. */ 3867 rdev_info(rdev, "disabling\n"); 3868 ret = _regulator_do_disable(rdev); 3869 if (ret != 0) 3870 rdev_err(rdev, "couldn't disable: %d\n", ret); 3871 } else { 3872 /* The intention is that in future we will 3873 * assume that full constraints are provided 3874 * so warn even if we aren't going to do 3875 * anything here. 3876 */ 3877 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3878 } 3879 3880unlock: 3881 mutex_unlock(&rdev->mutex); 3882 } 3883 3884 mutex_unlock(®ulator_list_mutex); 3885 3886 return 0; 3887} 3888late_initcall_sync(regulator_init_complete); 3889