core.c revision 87b2841753e1694fc96fefb467f6aff9940b07af
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; 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 ret = _regulator_do_set_voltage(rdev, 848 rdev->constraints->min_uV, 849 rdev->constraints->max_uV); 850 if (ret < 0) { 851 rdev_err(rdev, "failed to apply %duV constraint\n", 852 rdev->constraints->min_uV); 853 return ret; 854 } 855 } 856 857 /* constrain machine-level voltage specs to fit 858 * the actual range supported by this regulator. 859 */ 860 if (ops->list_voltage && rdev->desc->n_voltages) { 861 int count = rdev->desc->n_voltages; 862 int i; 863 int min_uV = INT_MAX; 864 int max_uV = INT_MIN; 865 int cmin = constraints->min_uV; 866 int cmax = constraints->max_uV; 867 868 /* it's safe to autoconfigure fixed-voltage supplies 869 and the constraints are used by list_voltage. */ 870 if (count == 1 && !cmin) { 871 cmin = 1; 872 cmax = INT_MAX; 873 constraints->min_uV = cmin; 874 constraints->max_uV = cmax; 875 } 876 877 /* voltage constraints are optional */ 878 if ((cmin == 0) && (cmax == 0)) 879 return 0; 880 881 /* else require explicit machine-level constraints */ 882 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 883 rdev_err(rdev, "invalid voltage constraints\n"); 884 return -EINVAL; 885 } 886 887 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 888 for (i = 0; i < count; i++) { 889 int value; 890 891 value = ops->list_voltage(rdev, i); 892 if (value <= 0) 893 continue; 894 895 /* maybe adjust [min_uV..max_uV] */ 896 if (value >= cmin && value < min_uV) 897 min_uV = value; 898 if (value <= cmax && value > max_uV) 899 max_uV = value; 900 } 901 902 /* final: [min_uV..max_uV] valid iff constraints valid */ 903 if (max_uV < min_uV) { 904 rdev_err(rdev, 905 "unsupportable voltage constraints %u-%uuV\n", 906 min_uV, max_uV); 907 return -EINVAL; 908 } 909 910 /* use regulator's subset of machine constraints */ 911 if (constraints->min_uV < min_uV) { 912 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 913 constraints->min_uV, min_uV); 914 constraints->min_uV = min_uV; 915 } 916 if (constraints->max_uV > max_uV) { 917 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 918 constraints->max_uV, max_uV); 919 constraints->max_uV = max_uV; 920 } 921 } 922 923 return 0; 924} 925 926static int machine_constraints_current(struct regulator_dev *rdev, 927 struct regulation_constraints *constraints) 928{ 929 struct regulator_ops *ops = rdev->desc->ops; 930 int ret; 931 932 if (!constraints->min_uA && !constraints->max_uA) 933 return 0; 934 935 if (constraints->min_uA > constraints->max_uA) { 936 rdev_err(rdev, "Invalid current constraints\n"); 937 return -EINVAL; 938 } 939 940 if (!ops->set_current_limit || !ops->get_current_limit) { 941 rdev_warn(rdev, "Operation of current configuration missing\n"); 942 return 0; 943 } 944 945 /* Set regulator current in constraints range */ 946 ret = ops->set_current_limit(rdev, constraints->min_uA, 947 constraints->max_uA); 948 if (ret < 0) { 949 rdev_err(rdev, "Failed to set current constraint, %d\n", ret); 950 return ret; 951 } 952 953 return 0; 954} 955 956/** 957 * set_machine_constraints - sets regulator constraints 958 * @rdev: regulator source 959 * @constraints: constraints to apply 960 * 961 * Allows platform initialisation code to define and constrain 962 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 963 * Constraints *must* be set by platform code in order for some 964 * regulator operations to proceed i.e. set_voltage, set_current_limit, 965 * set_mode. 966 */ 967static int set_machine_constraints(struct regulator_dev *rdev, 968 const struct regulation_constraints *constraints) 969{ 970 int ret = 0; 971 struct regulator_ops *ops = rdev->desc->ops; 972 973 if (constraints) 974 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 975 GFP_KERNEL); 976 else 977 rdev->constraints = kzalloc(sizeof(*constraints), 978 GFP_KERNEL); 979 if (!rdev->constraints) 980 return -ENOMEM; 981 982 ret = machine_constraints_voltage(rdev, rdev->constraints); 983 if (ret != 0) 984 goto out; 985 986 ret = machine_constraints_current(rdev, rdev->constraints); 987 if (ret != 0) 988 goto out; 989 990 /* do we need to setup our suspend state */ 991 if (rdev->constraints->initial_state) { 992 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 993 if (ret < 0) { 994 rdev_err(rdev, "failed to set suspend state\n"); 995 goto out; 996 } 997 } 998 999 if (rdev->constraints->initial_mode) { 1000 if (!ops->set_mode) { 1001 rdev_err(rdev, "no set_mode operation\n"); 1002 ret = -EINVAL; 1003 goto out; 1004 } 1005 1006 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 1007 if (ret < 0) { 1008 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 1009 goto out; 1010 } 1011 } 1012 1013 /* If the constraints say the regulator should be on at this point 1014 * and we have control then make sure it is enabled. 1015 */ 1016 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 1017 ops->enable) { 1018 ret = ops->enable(rdev); 1019 if (ret < 0) { 1020 rdev_err(rdev, "failed to enable\n"); 1021 goto out; 1022 } 1023 } 1024 1025 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 1026 && ops->set_ramp_delay) { 1027 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 1028 if (ret < 0) { 1029 rdev_err(rdev, "failed to set ramp_delay\n"); 1030 goto out; 1031 } 1032 } 1033 1034 print_constraints(rdev); 1035 return 0; 1036out: 1037 kfree(rdev->constraints); 1038 rdev->constraints = NULL; 1039 return ret; 1040} 1041 1042/** 1043 * set_supply - set regulator supply regulator 1044 * @rdev: regulator name 1045 * @supply_rdev: supply regulator name 1046 * 1047 * Called by platform initialisation code to set the supply regulator for this 1048 * regulator. This ensures that a regulators supply will also be enabled by the 1049 * core if it's child is enabled. 1050 */ 1051static int set_supply(struct regulator_dev *rdev, 1052 struct regulator_dev *supply_rdev) 1053{ 1054 int err; 1055 1056 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1057 1058 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1059 if (rdev->supply == NULL) { 1060 err = -ENOMEM; 1061 return err; 1062 } 1063 supply_rdev->open_count++; 1064 1065 return 0; 1066} 1067 1068/** 1069 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1070 * @rdev: regulator source 1071 * @consumer_dev_name: dev_name() string for device supply applies to 1072 * @supply: symbolic name for supply 1073 * 1074 * Allows platform initialisation code to map physical regulator 1075 * sources to symbolic names for supplies for use by devices. Devices 1076 * should use these symbolic names to request regulators, avoiding the 1077 * need to provide board-specific regulator names as platform data. 1078 */ 1079static int set_consumer_device_supply(struct regulator_dev *rdev, 1080 const char *consumer_dev_name, 1081 const char *supply) 1082{ 1083 struct regulator_map *node; 1084 int has_dev; 1085 1086 if (supply == NULL) 1087 return -EINVAL; 1088 1089 if (consumer_dev_name != NULL) 1090 has_dev = 1; 1091 else 1092 has_dev = 0; 1093 1094 list_for_each_entry(node, ®ulator_map_list, list) { 1095 if (node->dev_name && consumer_dev_name) { 1096 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1097 continue; 1098 } else if (node->dev_name || consumer_dev_name) { 1099 continue; 1100 } 1101 1102 if (strcmp(node->supply, supply) != 0) 1103 continue; 1104 1105 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1106 consumer_dev_name, 1107 dev_name(&node->regulator->dev), 1108 node->regulator->desc->name, 1109 supply, 1110 dev_name(&rdev->dev), rdev_get_name(rdev)); 1111 return -EBUSY; 1112 } 1113 1114 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1115 if (node == NULL) 1116 return -ENOMEM; 1117 1118 node->regulator = rdev; 1119 node->supply = supply; 1120 1121 if (has_dev) { 1122 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1123 if (node->dev_name == NULL) { 1124 kfree(node); 1125 return -ENOMEM; 1126 } 1127 } 1128 1129 list_add(&node->list, ®ulator_map_list); 1130 return 0; 1131} 1132 1133static void unset_regulator_supplies(struct regulator_dev *rdev) 1134{ 1135 struct regulator_map *node, *n; 1136 1137 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1138 if (rdev == node->regulator) { 1139 list_del(&node->list); 1140 kfree(node->dev_name); 1141 kfree(node); 1142 } 1143 } 1144} 1145 1146#define REG_STR_SIZE 64 1147 1148static struct regulator *create_regulator(struct regulator_dev *rdev, 1149 struct device *dev, 1150 const char *supply_name) 1151{ 1152 struct regulator *regulator; 1153 char buf[REG_STR_SIZE]; 1154 int err, size; 1155 1156 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1157 if (regulator == NULL) 1158 return NULL; 1159 1160 mutex_lock(&rdev->mutex); 1161 regulator->rdev = rdev; 1162 list_add(®ulator->list, &rdev->consumer_list); 1163 1164 if (dev) { 1165 regulator->dev = dev; 1166 1167 /* Add a link to the device sysfs entry */ 1168 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1169 dev->kobj.name, supply_name); 1170 if (size >= REG_STR_SIZE) 1171 goto overflow_err; 1172 1173 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1174 if (regulator->supply_name == NULL) 1175 goto overflow_err; 1176 1177 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1178 buf); 1179 if (err) { 1180 rdev_warn(rdev, "could not add device link %s err %d\n", 1181 dev->kobj.name, err); 1182 /* non-fatal */ 1183 } 1184 } else { 1185 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1186 if (regulator->supply_name == NULL) 1187 goto overflow_err; 1188 } 1189 1190 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1191 rdev->debugfs); 1192 if (!regulator->debugfs) { 1193 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1194 } else { 1195 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1196 ®ulator->uA_load); 1197 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1198 ®ulator->min_uV); 1199 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1200 ®ulator->max_uV); 1201 } 1202 1203 /* 1204 * Check now if the regulator is an always on regulator - if 1205 * it is then we don't need to do nearly so much work for 1206 * enable/disable calls. 1207 */ 1208 if (!_regulator_can_change_status(rdev) && 1209 _regulator_is_enabled(rdev)) 1210 regulator->always_on = true; 1211 1212 mutex_unlock(&rdev->mutex); 1213 return regulator; 1214overflow_err: 1215 list_del(®ulator->list); 1216 kfree(regulator); 1217 mutex_unlock(&rdev->mutex); 1218 return NULL; 1219} 1220 1221static int _regulator_get_enable_time(struct regulator_dev *rdev) 1222{ 1223 if (rdev->constraints && rdev->constraints->enable_time) 1224 return rdev->constraints->enable_time; 1225 if (!rdev->desc->ops->enable_time) 1226 return rdev->desc->enable_time; 1227 return rdev->desc->ops->enable_time(rdev); 1228} 1229 1230static struct regulator_supply_alias *regulator_find_supply_alias( 1231 struct device *dev, const char *supply) 1232{ 1233 struct regulator_supply_alias *map; 1234 1235 list_for_each_entry(map, ®ulator_supply_alias_list, list) 1236 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) 1237 return map; 1238 1239 return NULL; 1240} 1241 1242static void regulator_supply_alias(struct device **dev, const char **supply) 1243{ 1244 struct regulator_supply_alias *map; 1245 1246 map = regulator_find_supply_alias(*dev, *supply); 1247 if (map) { 1248 dev_dbg(*dev, "Mapping supply %s to %s,%s\n", 1249 *supply, map->alias_supply, 1250 dev_name(map->alias_dev)); 1251 *dev = map->alias_dev; 1252 *supply = map->alias_supply; 1253 } 1254} 1255 1256static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1257 const char *supply, 1258 int *ret) 1259{ 1260 struct regulator_dev *r; 1261 struct device_node *node; 1262 struct regulator_map *map; 1263 const char *devname = NULL; 1264 1265 regulator_supply_alias(&dev, &supply); 1266 1267 /* first do a dt based lookup */ 1268 if (dev && dev->of_node) { 1269 node = of_get_regulator(dev, supply); 1270 if (node) { 1271 list_for_each_entry(r, ®ulator_list, list) 1272 if (r->dev.parent && 1273 node == r->dev.of_node) 1274 return r; 1275 } else { 1276 /* 1277 * If we couldn't even get the node then it's 1278 * not just that the device didn't register 1279 * yet, there's no node and we'll never 1280 * succeed. 1281 */ 1282 *ret = -ENODEV; 1283 } 1284 } 1285 1286 /* if not found, try doing it non-dt way */ 1287 if (dev) 1288 devname = dev_name(dev); 1289 1290 list_for_each_entry(r, ®ulator_list, list) 1291 if (strcmp(rdev_get_name(r), supply) == 0) 1292 return r; 1293 1294 list_for_each_entry(map, ®ulator_map_list, list) { 1295 /* If the mapping has a device set up it must match */ 1296 if (map->dev_name && 1297 (!devname || strcmp(map->dev_name, devname))) 1298 continue; 1299 1300 if (strcmp(map->supply, supply) == 0) 1301 return map->regulator; 1302 } 1303 1304 1305 return NULL; 1306} 1307 1308/* Internal regulator request function */ 1309static struct regulator *_regulator_get(struct device *dev, const char *id, 1310 bool exclusive, bool allow_dummy) 1311{ 1312 struct regulator_dev *rdev; 1313 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1314 const char *devname = NULL; 1315 int ret = -EPROBE_DEFER; 1316 1317 if (id == NULL) { 1318 pr_err("get() with no identifier\n"); 1319 return ERR_PTR(-EINVAL); 1320 } 1321 1322 if (dev) 1323 devname = dev_name(dev); 1324 1325 mutex_lock(®ulator_list_mutex); 1326 1327 rdev = regulator_dev_lookup(dev, id, &ret); 1328 if (rdev) 1329 goto found; 1330 1331 regulator = ERR_PTR(ret); 1332 1333 /* 1334 * If we have return value from dev_lookup fail, we do not expect to 1335 * succeed, so, quit with appropriate error value 1336 */ 1337 if (ret && ret != -ENODEV) { 1338 goto out; 1339 } 1340 1341 if (!devname) 1342 devname = "deviceless"; 1343 1344 /* 1345 * Assume that a regulator is physically present and enabled 1346 * even if it isn't hooked up and just provide a dummy. 1347 */ 1348 if (have_full_constraints() && allow_dummy) { 1349 pr_warn("%s supply %s not found, using dummy regulator\n", 1350 devname, id); 1351 1352 rdev = dummy_regulator_rdev; 1353 goto found; 1354 } else { 1355 dev_err(dev, "dummy supplies not allowed\n"); 1356 } 1357 1358 mutex_unlock(®ulator_list_mutex); 1359 return regulator; 1360 1361found: 1362 if (rdev->exclusive) { 1363 regulator = ERR_PTR(-EPERM); 1364 goto out; 1365 } 1366 1367 if (exclusive && rdev->open_count) { 1368 regulator = ERR_PTR(-EBUSY); 1369 goto out; 1370 } 1371 1372 if (!try_module_get(rdev->owner)) 1373 goto out; 1374 1375 regulator = create_regulator(rdev, dev, id); 1376 if (regulator == NULL) { 1377 regulator = ERR_PTR(-ENOMEM); 1378 module_put(rdev->owner); 1379 goto out; 1380 } 1381 1382 rdev->open_count++; 1383 if (exclusive) { 1384 rdev->exclusive = 1; 1385 1386 ret = _regulator_is_enabled(rdev); 1387 if (ret > 0) 1388 rdev->use_count = 1; 1389 else 1390 rdev->use_count = 0; 1391 } 1392 1393out: 1394 mutex_unlock(®ulator_list_mutex); 1395 1396 return regulator; 1397} 1398 1399/** 1400 * regulator_get - lookup and obtain a reference to a regulator. 1401 * @dev: device for regulator "consumer" 1402 * @id: Supply name or regulator ID. 1403 * 1404 * Returns a struct regulator corresponding to the regulator producer, 1405 * or IS_ERR() condition containing errno. 1406 * 1407 * Use of supply names configured via regulator_set_device_supply() is 1408 * strongly encouraged. It is recommended that the supply name used 1409 * should match the name used for the supply and/or the relevant 1410 * device pins in the datasheet. 1411 */ 1412struct regulator *regulator_get(struct device *dev, const char *id) 1413{ 1414 return _regulator_get(dev, id, false, true); 1415} 1416EXPORT_SYMBOL_GPL(regulator_get); 1417 1418/** 1419 * regulator_get_exclusive - obtain exclusive access 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. Other consumers will be 1425 * unable to obtain this reference is held and the use count for the 1426 * regulator will be initialised to reflect the current state of the 1427 * regulator. 1428 * 1429 * This is intended for use by consumers which cannot tolerate shared 1430 * use of the regulator such as those which need to force the 1431 * regulator off for correct operation of the hardware they are 1432 * controlling. 1433 * 1434 * Use of supply names configured via regulator_set_device_supply() is 1435 * strongly encouraged. It is recommended that the supply name used 1436 * should match the name used for the supply and/or the relevant 1437 * device pins in the datasheet. 1438 */ 1439struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1440{ 1441 return _regulator_get(dev, id, true, false); 1442} 1443EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1444 1445/** 1446 * regulator_get_optional - obtain optional access to a regulator. 1447 * @dev: device for regulator "consumer" 1448 * @id: Supply name or regulator ID. 1449 * 1450 * Returns a struct regulator corresponding to the regulator producer, 1451 * or IS_ERR() condition containing errno. Other consumers will be 1452 * unable to obtain this reference is held and the use count for the 1453 * regulator will be initialised to reflect the current state of the 1454 * regulator. 1455 * 1456 * This is intended for use by consumers for devices which can have 1457 * some supplies unconnected in normal use, such as some MMC devices. 1458 * It can allow the regulator core to provide stub supplies for other 1459 * supplies requested using normal regulator_get() calls without 1460 * disrupting the operation of drivers that can handle absent 1461 * supplies. 1462 * 1463 * Use of supply names configured via regulator_set_device_supply() is 1464 * strongly encouraged. It is recommended that the supply name used 1465 * should match the name used for the supply and/or the relevant 1466 * device pins in the datasheet. 1467 */ 1468struct regulator *regulator_get_optional(struct device *dev, const char *id) 1469{ 1470 return _regulator_get(dev, id, false, false); 1471} 1472EXPORT_SYMBOL_GPL(regulator_get_optional); 1473 1474/* Locks held by regulator_put() */ 1475static void _regulator_put(struct regulator *regulator) 1476{ 1477 struct regulator_dev *rdev; 1478 1479 if (regulator == NULL || IS_ERR(regulator)) 1480 return; 1481 1482 rdev = regulator->rdev; 1483 1484 debugfs_remove_recursive(regulator->debugfs); 1485 1486 /* remove any sysfs entries */ 1487 if (regulator->dev) 1488 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1489 kfree(regulator->supply_name); 1490 list_del(®ulator->list); 1491 kfree(regulator); 1492 1493 rdev->open_count--; 1494 rdev->exclusive = 0; 1495 1496 module_put(rdev->owner); 1497} 1498 1499/** 1500 * regulator_put - "free" the regulator source 1501 * @regulator: regulator source 1502 * 1503 * Note: drivers must ensure that all regulator_enable calls made on this 1504 * regulator source are balanced by regulator_disable calls prior to calling 1505 * this function. 1506 */ 1507void regulator_put(struct regulator *regulator) 1508{ 1509 mutex_lock(®ulator_list_mutex); 1510 _regulator_put(regulator); 1511 mutex_unlock(®ulator_list_mutex); 1512} 1513EXPORT_SYMBOL_GPL(regulator_put); 1514 1515/** 1516 * regulator_register_supply_alias - Provide device alias for supply lookup 1517 * 1518 * @dev: device that will be given as the regulator "consumer" 1519 * @id: Supply name or regulator ID 1520 * @alias_dev: device that should be used to lookup the supply 1521 * @alias_id: Supply name or regulator ID that should be used to lookup the 1522 * supply 1523 * 1524 * All lookups for id on dev will instead be conducted for alias_id on 1525 * alias_dev. 1526 */ 1527int regulator_register_supply_alias(struct device *dev, const char *id, 1528 struct device *alias_dev, 1529 const char *alias_id) 1530{ 1531 struct regulator_supply_alias *map; 1532 1533 map = regulator_find_supply_alias(dev, id); 1534 if (map) 1535 return -EEXIST; 1536 1537 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1538 if (!map) 1539 return -ENOMEM; 1540 1541 map->src_dev = dev; 1542 map->src_supply = id; 1543 map->alias_dev = alias_dev; 1544 map->alias_supply = alias_id; 1545 1546 list_add(&map->list, ®ulator_supply_alias_list); 1547 1548 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1549 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1550 1551 return 0; 1552} 1553EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1554 1555/** 1556 * regulator_unregister_supply_alias - Remove device alias 1557 * 1558 * @dev: device that will be given as the regulator "consumer" 1559 * @id: Supply name or regulator ID 1560 * 1561 * Remove a lookup alias if one exists for id on dev. 1562 */ 1563void regulator_unregister_supply_alias(struct device *dev, const char *id) 1564{ 1565 struct regulator_supply_alias *map; 1566 1567 map = regulator_find_supply_alias(dev, id); 1568 if (map) { 1569 list_del(&map->list); 1570 kfree(map); 1571 } 1572} 1573EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1574 1575/** 1576 * regulator_bulk_register_supply_alias - register multiple aliases 1577 * 1578 * @dev: device that will be given as the regulator "consumer" 1579 * @id: List of supply names or regulator IDs 1580 * @alias_dev: device that should be used to lookup the supply 1581 * @alias_id: List of supply names or regulator IDs that should be used to 1582 * lookup the supply 1583 * @num_id: Number of aliases to register 1584 * 1585 * @return 0 on success, an errno on failure. 1586 * 1587 * This helper function allows drivers to register several supply 1588 * aliases in one operation. If any of the aliases cannot be 1589 * registered any aliases that were registered will be removed 1590 * before returning to the caller. 1591 */ 1592int regulator_bulk_register_supply_alias(struct device *dev, const char **id, 1593 struct device *alias_dev, 1594 const char **alias_id, 1595 int num_id) 1596{ 1597 int i; 1598 int ret; 1599 1600 for (i = 0; i < num_id; ++i) { 1601 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1602 alias_id[i]); 1603 if (ret < 0) 1604 goto err; 1605 } 1606 1607 return 0; 1608 1609err: 1610 dev_err(dev, 1611 "Failed to create supply alias %s,%s -> %s,%s\n", 1612 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1613 1614 while (--i >= 0) 1615 regulator_unregister_supply_alias(dev, id[i]); 1616 1617 return ret; 1618} 1619EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1620 1621/** 1622 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1623 * 1624 * @dev: device that will be given as the regulator "consumer" 1625 * @id: List of supply names or regulator IDs 1626 * @num_id: Number of aliases to unregister 1627 * 1628 * This helper function allows drivers to unregister several supply 1629 * aliases in one operation. 1630 */ 1631void regulator_bulk_unregister_supply_alias(struct device *dev, 1632 const char **id, 1633 int num_id) 1634{ 1635 int i; 1636 1637 for (i = 0; i < num_id; ++i) 1638 regulator_unregister_supply_alias(dev, id[i]); 1639} 1640EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1641 1642 1643/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1644static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1645 const struct regulator_config *config) 1646{ 1647 struct regulator_enable_gpio *pin; 1648 int ret; 1649 1650 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1651 if (pin->gpio == config->ena_gpio) { 1652 rdev_dbg(rdev, "GPIO %d is already used\n", 1653 config->ena_gpio); 1654 goto update_ena_gpio_to_rdev; 1655 } 1656 } 1657 1658 ret = gpio_request_one(config->ena_gpio, 1659 GPIOF_DIR_OUT | config->ena_gpio_flags, 1660 rdev_get_name(rdev)); 1661 if (ret) 1662 return ret; 1663 1664 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1665 if (pin == NULL) { 1666 gpio_free(config->ena_gpio); 1667 return -ENOMEM; 1668 } 1669 1670 pin->gpio = config->ena_gpio; 1671 pin->ena_gpio_invert = config->ena_gpio_invert; 1672 list_add(&pin->list, ®ulator_ena_gpio_list); 1673 1674update_ena_gpio_to_rdev: 1675 pin->request_count++; 1676 rdev->ena_pin = pin; 1677 return 0; 1678} 1679 1680static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1681{ 1682 struct regulator_enable_gpio *pin, *n; 1683 1684 if (!rdev->ena_pin) 1685 return; 1686 1687 /* Free the GPIO only in case of no use */ 1688 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1689 if (pin->gpio == rdev->ena_pin->gpio) { 1690 if (pin->request_count <= 1) { 1691 pin->request_count = 0; 1692 gpio_free(pin->gpio); 1693 list_del(&pin->list); 1694 kfree(pin); 1695 } else { 1696 pin->request_count--; 1697 } 1698 } 1699 } 1700} 1701 1702/** 1703 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1704 * @rdev: regulator_dev structure 1705 * @enable: enable GPIO at initial use? 1706 * 1707 * GPIO is enabled in case of initial use. (enable_count is 0) 1708 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1709 */ 1710static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1711{ 1712 struct regulator_enable_gpio *pin = rdev->ena_pin; 1713 1714 if (!pin) 1715 return -EINVAL; 1716 1717 if (enable) { 1718 /* Enable GPIO at initial use */ 1719 if (pin->enable_count == 0) 1720 gpio_set_value_cansleep(pin->gpio, 1721 !pin->ena_gpio_invert); 1722 1723 pin->enable_count++; 1724 } else { 1725 if (pin->enable_count > 1) { 1726 pin->enable_count--; 1727 return 0; 1728 } 1729 1730 /* Disable GPIO if not used */ 1731 if (pin->enable_count <= 1) { 1732 gpio_set_value_cansleep(pin->gpio, 1733 pin->ena_gpio_invert); 1734 pin->enable_count = 0; 1735 } 1736 } 1737 1738 return 0; 1739} 1740 1741static int _regulator_do_enable(struct regulator_dev *rdev) 1742{ 1743 int ret, delay; 1744 1745 /* Query before enabling in case configuration dependent. */ 1746 ret = _regulator_get_enable_time(rdev); 1747 if (ret >= 0) { 1748 delay = ret; 1749 } else { 1750 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1751 delay = 0; 1752 } 1753 1754 trace_regulator_enable(rdev_get_name(rdev)); 1755 1756 if (rdev->ena_pin) { 1757 ret = regulator_ena_gpio_ctrl(rdev, true); 1758 if (ret < 0) 1759 return ret; 1760 rdev->ena_gpio_state = 1; 1761 } else if (rdev->desc->ops->enable) { 1762 ret = rdev->desc->ops->enable(rdev); 1763 if (ret < 0) 1764 return ret; 1765 } else { 1766 return -EINVAL; 1767 } 1768 1769 /* Allow the regulator to ramp; it would be useful to extend 1770 * this for bulk operations so that the regulators can ramp 1771 * together. */ 1772 trace_regulator_enable_delay(rdev_get_name(rdev)); 1773 1774 /* 1775 * Delay for the requested amount of time as per the guidelines in: 1776 * 1777 * Documentation/timers/timers-howto.txt 1778 * 1779 * The assumption here is that regulators will never be enabled in 1780 * atomic context and therefore sleeping functions can be used. 1781 */ 1782 if (delay) { 1783 unsigned int ms = delay / 1000; 1784 unsigned int us = delay % 1000; 1785 1786 if (ms > 0) { 1787 /* 1788 * For small enough values, handle super-millisecond 1789 * delays in the usleep_range() call below. 1790 */ 1791 if (ms < 20) 1792 us += ms * 1000; 1793 else 1794 msleep(ms); 1795 } 1796 1797 /* 1798 * Give the scheduler some room to coalesce with any other 1799 * wakeup sources. For delays shorter than 10 us, don't even 1800 * bother setting up high-resolution timers and just busy- 1801 * loop. 1802 */ 1803 if (us >= 10) 1804 usleep_range(us, us + 100); 1805 else 1806 udelay(us); 1807 } 1808 1809 trace_regulator_enable_complete(rdev_get_name(rdev)); 1810 1811 return 0; 1812} 1813 1814/* locks held by regulator_enable() */ 1815static int _regulator_enable(struct regulator_dev *rdev) 1816{ 1817 int ret; 1818 1819 /* check voltage and requested load before enabling */ 1820 if (rdev->constraints && 1821 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1822 drms_uA_update(rdev); 1823 1824 if (rdev->use_count == 0) { 1825 /* The regulator may on if it's not switchable or left on */ 1826 ret = _regulator_is_enabled(rdev); 1827 if (ret == -EINVAL || ret == 0) { 1828 if (!_regulator_can_change_status(rdev)) 1829 return -EPERM; 1830 1831 ret = _regulator_do_enable(rdev); 1832 if (ret < 0) 1833 return ret; 1834 1835 } else if (ret < 0) { 1836 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1837 return ret; 1838 } 1839 /* Fallthrough on positive return values - already enabled */ 1840 } 1841 1842 rdev->use_count++; 1843 1844 return 0; 1845} 1846 1847/** 1848 * regulator_enable - enable regulator output 1849 * @regulator: regulator source 1850 * 1851 * Request that the regulator be enabled with the regulator output at 1852 * the predefined voltage or current value. Calls to regulator_enable() 1853 * must be balanced with calls to regulator_disable(). 1854 * 1855 * NOTE: the output value can be set by other drivers, boot loader or may be 1856 * hardwired in the regulator. 1857 */ 1858int regulator_enable(struct regulator *regulator) 1859{ 1860 struct regulator_dev *rdev = regulator->rdev; 1861 int ret = 0; 1862 1863 if (regulator->always_on) 1864 return 0; 1865 1866 if (rdev->supply) { 1867 ret = regulator_enable(rdev->supply); 1868 if (ret != 0) 1869 return ret; 1870 } 1871 1872 mutex_lock(&rdev->mutex); 1873 ret = _regulator_enable(rdev); 1874 mutex_unlock(&rdev->mutex); 1875 1876 if (ret != 0 && rdev->supply) 1877 regulator_disable(rdev->supply); 1878 1879 return ret; 1880} 1881EXPORT_SYMBOL_GPL(regulator_enable); 1882 1883static int _regulator_do_disable(struct regulator_dev *rdev) 1884{ 1885 int ret; 1886 1887 trace_regulator_disable(rdev_get_name(rdev)); 1888 1889 if (rdev->ena_pin) { 1890 ret = regulator_ena_gpio_ctrl(rdev, false); 1891 if (ret < 0) 1892 return ret; 1893 rdev->ena_gpio_state = 0; 1894 1895 } else if (rdev->desc->ops->disable) { 1896 ret = rdev->desc->ops->disable(rdev); 1897 if (ret != 0) 1898 return ret; 1899 } 1900 1901 trace_regulator_disable_complete(rdev_get_name(rdev)); 1902 1903 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1904 NULL); 1905 return 0; 1906} 1907 1908/* locks held by regulator_disable() */ 1909static int _regulator_disable(struct regulator_dev *rdev) 1910{ 1911 int ret = 0; 1912 1913 if (WARN(rdev->use_count <= 0, 1914 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1915 return -EIO; 1916 1917 /* are we the last user and permitted to disable ? */ 1918 if (rdev->use_count == 1 && 1919 (rdev->constraints && !rdev->constraints->always_on)) { 1920 1921 /* we are last user */ 1922 if (_regulator_can_change_status(rdev)) { 1923 ret = _regulator_do_disable(rdev); 1924 if (ret < 0) { 1925 rdev_err(rdev, "failed to disable\n"); 1926 return ret; 1927 } 1928 } 1929 1930 rdev->use_count = 0; 1931 } else if (rdev->use_count > 1) { 1932 1933 if (rdev->constraints && 1934 (rdev->constraints->valid_ops_mask & 1935 REGULATOR_CHANGE_DRMS)) 1936 drms_uA_update(rdev); 1937 1938 rdev->use_count--; 1939 } 1940 1941 return ret; 1942} 1943 1944/** 1945 * regulator_disable - disable regulator output 1946 * @regulator: regulator source 1947 * 1948 * Disable the regulator output voltage or current. Calls to 1949 * regulator_enable() must be balanced with calls to 1950 * regulator_disable(). 1951 * 1952 * NOTE: this will only disable the regulator output if no other consumer 1953 * devices have it enabled, the regulator device supports disabling and 1954 * machine constraints permit this operation. 1955 */ 1956int regulator_disable(struct regulator *regulator) 1957{ 1958 struct regulator_dev *rdev = regulator->rdev; 1959 int ret = 0; 1960 1961 if (regulator->always_on) 1962 return 0; 1963 1964 mutex_lock(&rdev->mutex); 1965 ret = _regulator_disable(rdev); 1966 mutex_unlock(&rdev->mutex); 1967 1968 if (ret == 0 && rdev->supply) 1969 regulator_disable(rdev->supply); 1970 1971 return ret; 1972} 1973EXPORT_SYMBOL_GPL(regulator_disable); 1974 1975/* locks held by regulator_force_disable() */ 1976static int _regulator_force_disable(struct regulator_dev *rdev) 1977{ 1978 int ret = 0; 1979 1980 /* force disable */ 1981 if (rdev->desc->ops->disable) { 1982 /* ah well, who wants to live forever... */ 1983 ret = rdev->desc->ops->disable(rdev); 1984 if (ret < 0) { 1985 rdev_err(rdev, "failed to force disable\n"); 1986 return ret; 1987 } 1988 /* notify other consumers that power has been forced off */ 1989 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1990 REGULATOR_EVENT_DISABLE, NULL); 1991 } 1992 1993 return ret; 1994} 1995 1996/** 1997 * regulator_force_disable - force disable regulator output 1998 * @regulator: regulator source 1999 * 2000 * Forcibly disable the regulator output voltage or current. 2001 * NOTE: this *will* disable the regulator output even if other consumer 2002 * devices have it enabled. This should be used for situations when device 2003 * damage will likely occur if the regulator is not disabled (e.g. over temp). 2004 */ 2005int regulator_force_disable(struct regulator *regulator) 2006{ 2007 struct regulator_dev *rdev = regulator->rdev; 2008 int ret; 2009 2010 mutex_lock(&rdev->mutex); 2011 regulator->uA_load = 0; 2012 ret = _regulator_force_disable(regulator->rdev); 2013 mutex_unlock(&rdev->mutex); 2014 2015 if (rdev->supply) 2016 while (rdev->open_count--) 2017 regulator_disable(rdev->supply); 2018 2019 return ret; 2020} 2021EXPORT_SYMBOL_GPL(regulator_force_disable); 2022 2023static void regulator_disable_work(struct work_struct *work) 2024{ 2025 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 2026 disable_work.work); 2027 int count, i, ret; 2028 2029 mutex_lock(&rdev->mutex); 2030 2031 BUG_ON(!rdev->deferred_disables); 2032 2033 count = rdev->deferred_disables; 2034 rdev->deferred_disables = 0; 2035 2036 for (i = 0; i < count; i++) { 2037 ret = _regulator_disable(rdev); 2038 if (ret != 0) 2039 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 2040 } 2041 2042 mutex_unlock(&rdev->mutex); 2043 2044 if (rdev->supply) { 2045 for (i = 0; i < count; i++) { 2046 ret = regulator_disable(rdev->supply); 2047 if (ret != 0) { 2048 rdev_err(rdev, 2049 "Supply disable failed: %d\n", ret); 2050 } 2051 } 2052 } 2053} 2054 2055/** 2056 * regulator_disable_deferred - disable regulator output with delay 2057 * @regulator: regulator source 2058 * @ms: miliseconds until the regulator is disabled 2059 * 2060 * Execute regulator_disable() on the regulator after a delay. This 2061 * is intended for use with devices that require some time to quiesce. 2062 * 2063 * NOTE: this will only disable the regulator output if no other consumer 2064 * devices have it enabled, the regulator device supports disabling and 2065 * machine constraints permit this operation. 2066 */ 2067int regulator_disable_deferred(struct regulator *regulator, int ms) 2068{ 2069 struct regulator_dev *rdev = regulator->rdev; 2070 int ret; 2071 2072 if (regulator->always_on) 2073 return 0; 2074 2075 if (!ms) 2076 return regulator_disable(regulator); 2077 2078 mutex_lock(&rdev->mutex); 2079 rdev->deferred_disables++; 2080 mutex_unlock(&rdev->mutex); 2081 2082 ret = queue_delayed_work(system_power_efficient_wq, 2083 &rdev->disable_work, 2084 msecs_to_jiffies(ms)); 2085 if (ret < 0) 2086 return ret; 2087 else 2088 return 0; 2089} 2090EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2091 2092static int _regulator_is_enabled(struct regulator_dev *rdev) 2093{ 2094 /* A GPIO control always takes precedence */ 2095 if (rdev->ena_pin) 2096 return rdev->ena_gpio_state; 2097 2098 /* If we don't know then assume that the regulator is always on */ 2099 if (!rdev->desc->ops->is_enabled) 2100 return 1; 2101 2102 return rdev->desc->ops->is_enabled(rdev); 2103} 2104 2105/** 2106 * regulator_is_enabled - is the regulator output enabled 2107 * @regulator: regulator source 2108 * 2109 * Returns positive if the regulator driver backing the source/client 2110 * has requested that the device be enabled, zero if it hasn't, else a 2111 * negative errno code. 2112 * 2113 * Note that the device backing this regulator handle can have multiple 2114 * users, so it might be enabled even if regulator_enable() was never 2115 * called for this particular source. 2116 */ 2117int regulator_is_enabled(struct regulator *regulator) 2118{ 2119 int ret; 2120 2121 if (regulator->always_on) 2122 return 1; 2123 2124 mutex_lock(®ulator->rdev->mutex); 2125 ret = _regulator_is_enabled(regulator->rdev); 2126 mutex_unlock(®ulator->rdev->mutex); 2127 2128 return ret; 2129} 2130EXPORT_SYMBOL_GPL(regulator_is_enabled); 2131 2132/** 2133 * regulator_can_change_voltage - check if regulator can change voltage 2134 * @regulator: regulator source 2135 * 2136 * Returns positive if the regulator driver backing the source/client 2137 * can change its voltage, false otherwise. Usefull for detecting fixed 2138 * or dummy regulators and disabling voltage change logic in the client 2139 * driver. 2140 */ 2141int regulator_can_change_voltage(struct regulator *regulator) 2142{ 2143 struct regulator_dev *rdev = regulator->rdev; 2144 2145 if (rdev->constraints && 2146 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2147 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2148 return 1; 2149 2150 if (rdev->desc->continuous_voltage_range && 2151 rdev->constraints->min_uV && rdev->constraints->max_uV && 2152 rdev->constraints->min_uV != rdev->constraints->max_uV) 2153 return 1; 2154 } 2155 2156 return 0; 2157} 2158EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2159 2160/** 2161 * regulator_count_voltages - count regulator_list_voltage() selectors 2162 * @regulator: regulator source 2163 * 2164 * Returns number of selectors, or negative errno. Selectors are 2165 * numbered starting at zero, and typically correspond to bitfields 2166 * in hardware registers. 2167 */ 2168int regulator_count_voltages(struct regulator *regulator) 2169{ 2170 struct regulator_dev *rdev = regulator->rdev; 2171 2172 return rdev->desc->n_voltages ? : -EINVAL; 2173} 2174EXPORT_SYMBOL_GPL(regulator_count_voltages); 2175 2176/** 2177 * regulator_list_voltage - enumerate supported voltages 2178 * @regulator: regulator source 2179 * @selector: identify voltage to list 2180 * Context: can sleep 2181 * 2182 * Returns a voltage that can be passed to @regulator_set_voltage(), 2183 * zero if this selector code can't be used on this system, or a 2184 * negative errno. 2185 */ 2186int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2187{ 2188 struct regulator_dev *rdev = regulator->rdev; 2189 struct regulator_ops *ops = rdev->desc->ops; 2190 int ret; 2191 2192 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2193 return -EINVAL; 2194 2195 mutex_lock(&rdev->mutex); 2196 ret = ops->list_voltage(rdev, selector); 2197 mutex_unlock(&rdev->mutex); 2198 2199 if (ret > 0) { 2200 if (ret < rdev->constraints->min_uV) 2201 ret = 0; 2202 else if (ret > rdev->constraints->max_uV) 2203 ret = 0; 2204 } 2205 2206 return ret; 2207} 2208EXPORT_SYMBOL_GPL(regulator_list_voltage); 2209 2210/** 2211 * regulator_get_linear_step - return the voltage step size between VSEL values 2212 * @regulator: regulator source 2213 * 2214 * Returns the voltage step size between VSEL values for linear 2215 * regulators, or return 0 if the regulator isn't a linear regulator. 2216 */ 2217unsigned int regulator_get_linear_step(struct regulator *regulator) 2218{ 2219 struct regulator_dev *rdev = regulator->rdev; 2220 2221 return rdev->desc->uV_step; 2222} 2223EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2224 2225/** 2226 * regulator_is_supported_voltage - check if a voltage range can be supported 2227 * 2228 * @regulator: Regulator to check. 2229 * @min_uV: Minimum required voltage in uV. 2230 * @max_uV: Maximum required voltage in uV. 2231 * 2232 * Returns a boolean or a negative error code. 2233 */ 2234int regulator_is_supported_voltage(struct regulator *regulator, 2235 int min_uV, int max_uV) 2236{ 2237 struct regulator_dev *rdev = regulator->rdev; 2238 int i, voltages, ret; 2239 2240 /* If we can't change voltage check the current voltage */ 2241 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2242 ret = regulator_get_voltage(regulator); 2243 if (ret >= 0) 2244 return (min_uV <= ret && ret <= max_uV); 2245 else 2246 return ret; 2247 } 2248 2249 /* Any voltage within constrains range is fine? */ 2250 if (rdev->desc->continuous_voltage_range) 2251 return min_uV >= rdev->constraints->min_uV && 2252 max_uV <= rdev->constraints->max_uV; 2253 2254 ret = regulator_count_voltages(regulator); 2255 if (ret < 0) 2256 return ret; 2257 voltages = ret; 2258 2259 for (i = 0; i < voltages; i++) { 2260 ret = regulator_list_voltage(regulator, i); 2261 2262 if (ret >= min_uV && ret <= max_uV) 2263 return 1; 2264 } 2265 2266 return 0; 2267} 2268EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2269 2270static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2271 int min_uV, int max_uV) 2272{ 2273 int ret; 2274 int delay = 0; 2275 int best_val = 0; 2276 unsigned int selector; 2277 int old_selector = -1; 2278 2279 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2280 2281 min_uV += rdev->constraints->uV_offset; 2282 max_uV += rdev->constraints->uV_offset; 2283 2284 /* 2285 * If we can't obtain the old selector there is not enough 2286 * info to call set_voltage_time_sel(). 2287 */ 2288 if (_regulator_is_enabled(rdev) && 2289 rdev->desc->ops->set_voltage_time_sel && 2290 rdev->desc->ops->get_voltage_sel) { 2291 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2292 if (old_selector < 0) 2293 return old_selector; 2294 } 2295 2296 if (rdev->desc->ops->set_voltage) { 2297 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2298 &selector); 2299 2300 if (ret >= 0) { 2301 if (rdev->desc->ops->list_voltage) 2302 best_val = rdev->desc->ops->list_voltage(rdev, 2303 selector); 2304 else 2305 best_val = _regulator_get_voltage(rdev); 2306 } 2307 2308 } else if (rdev->desc->ops->set_voltage_sel) { 2309 if (rdev->desc->ops->map_voltage) { 2310 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2311 max_uV); 2312 } else { 2313 if (rdev->desc->ops->list_voltage == 2314 regulator_list_voltage_linear) 2315 ret = regulator_map_voltage_linear(rdev, 2316 min_uV, max_uV); 2317 else 2318 ret = regulator_map_voltage_iterate(rdev, 2319 min_uV, max_uV); 2320 } 2321 2322 if (ret >= 0) { 2323 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2324 if (min_uV <= best_val && max_uV >= best_val) { 2325 selector = ret; 2326 if (old_selector == selector) 2327 ret = 0; 2328 else 2329 ret = rdev->desc->ops->set_voltage_sel( 2330 rdev, ret); 2331 } else { 2332 ret = -EINVAL; 2333 } 2334 } 2335 } else { 2336 ret = -EINVAL; 2337 } 2338 2339 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2340 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2341 && old_selector != selector) { 2342 2343 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2344 old_selector, selector); 2345 if (delay < 0) { 2346 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2347 delay); 2348 delay = 0; 2349 } 2350 2351 /* Insert any necessary delays */ 2352 if (delay >= 1000) { 2353 mdelay(delay / 1000); 2354 udelay(delay % 1000); 2355 } else if (delay) { 2356 udelay(delay); 2357 } 2358 } 2359 2360 if (ret == 0 && best_val >= 0) { 2361 unsigned long data = best_val; 2362 2363 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2364 (void *)data); 2365 } 2366 2367 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2368 2369 return ret; 2370} 2371 2372/** 2373 * regulator_set_voltage - set regulator output voltage 2374 * @regulator: regulator source 2375 * @min_uV: Minimum required voltage in uV 2376 * @max_uV: Maximum acceptable voltage in uV 2377 * 2378 * Sets a voltage regulator to the desired output voltage. This can be set 2379 * during any regulator state. IOW, regulator can be disabled or enabled. 2380 * 2381 * If the regulator is enabled then the voltage will change to the new value 2382 * immediately otherwise if the regulator is disabled the regulator will 2383 * output at the new voltage when enabled. 2384 * 2385 * NOTE: If the regulator is shared between several devices then the lowest 2386 * request voltage that meets the system constraints will be used. 2387 * Regulator system constraints must be set for this regulator before 2388 * calling this function otherwise this call will fail. 2389 */ 2390int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2391{ 2392 struct regulator_dev *rdev = regulator->rdev; 2393 int ret = 0; 2394 int old_min_uV, old_max_uV; 2395 2396 mutex_lock(&rdev->mutex); 2397 2398 /* If we're setting the same range as last time the change 2399 * should be a noop (some cpufreq implementations use the same 2400 * voltage for multiple frequencies, for example). 2401 */ 2402 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2403 goto out; 2404 2405 /* sanity check */ 2406 if (!rdev->desc->ops->set_voltage && 2407 !rdev->desc->ops->set_voltage_sel) { 2408 ret = -EINVAL; 2409 goto out; 2410 } 2411 2412 /* constraints check */ 2413 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2414 if (ret < 0) 2415 goto out; 2416 2417 /* restore original values in case of error */ 2418 old_min_uV = regulator->min_uV; 2419 old_max_uV = regulator->max_uV; 2420 regulator->min_uV = min_uV; 2421 regulator->max_uV = max_uV; 2422 2423 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2424 if (ret < 0) 2425 goto out2; 2426 2427 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2428 if (ret < 0) 2429 goto out2; 2430 2431out: 2432 mutex_unlock(&rdev->mutex); 2433 return ret; 2434out2: 2435 regulator->min_uV = old_min_uV; 2436 regulator->max_uV = old_max_uV; 2437 mutex_unlock(&rdev->mutex); 2438 return ret; 2439} 2440EXPORT_SYMBOL_GPL(regulator_set_voltage); 2441 2442/** 2443 * regulator_set_voltage_time - get raise/fall time 2444 * @regulator: regulator source 2445 * @old_uV: starting voltage in microvolts 2446 * @new_uV: target voltage in microvolts 2447 * 2448 * Provided with the starting and ending voltage, this function attempts to 2449 * calculate the time in microseconds required to rise or fall to this new 2450 * voltage. 2451 */ 2452int regulator_set_voltage_time(struct regulator *regulator, 2453 int old_uV, int new_uV) 2454{ 2455 struct regulator_dev *rdev = regulator->rdev; 2456 struct regulator_ops *ops = rdev->desc->ops; 2457 int old_sel = -1; 2458 int new_sel = -1; 2459 int voltage; 2460 int i; 2461 2462 /* Currently requires operations to do this */ 2463 if (!ops->list_voltage || !ops->set_voltage_time_sel 2464 || !rdev->desc->n_voltages) 2465 return -EINVAL; 2466 2467 for (i = 0; i < rdev->desc->n_voltages; i++) { 2468 /* We only look for exact voltage matches here */ 2469 voltage = regulator_list_voltage(regulator, i); 2470 if (voltage < 0) 2471 return -EINVAL; 2472 if (voltage == 0) 2473 continue; 2474 if (voltage == old_uV) 2475 old_sel = i; 2476 if (voltage == new_uV) 2477 new_sel = i; 2478 } 2479 2480 if (old_sel < 0 || new_sel < 0) 2481 return -EINVAL; 2482 2483 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2484} 2485EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2486 2487/** 2488 * regulator_set_voltage_time_sel - get raise/fall time 2489 * @rdev: regulator source device 2490 * @old_selector: selector for starting voltage 2491 * @new_selector: selector for target voltage 2492 * 2493 * Provided with the starting and target voltage selectors, this function 2494 * returns time in microseconds required to rise or fall to this new voltage 2495 * 2496 * Drivers providing ramp_delay in regulation_constraints can use this as their 2497 * set_voltage_time_sel() operation. 2498 */ 2499int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2500 unsigned int old_selector, 2501 unsigned int new_selector) 2502{ 2503 unsigned int ramp_delay = 0; 2504 int old_volt, new_volt; 2505 2506 if (rdev->constraints->ramp_delay) 2507 ramp_delay = rdev->constraints->ramp_delay; 2508 else if (rdev->desc->ramp_delay) 2509 ramp_delay = rdev->desc->ramp_delay; 2510 2511 if (ramp_delay == 0) { 2512 rdev_warn(rdev, "ramp_delay not set\n"); 2513 return 0; 2514 } 2515 2516 /* sanity check */ 2517 if (!rdev->desc->ops->list_voltage) 2518 return -EINVAL; 2519 2520 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2521 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2522 2523 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2524} 2525EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2526 2527/** 2528 * regulator_sync_voltage - re-apply last regulator output voltage 2529 * @regulator: regulator source 2530 * 2531 * Re-apply the last configured voltage. This is intended to be used 2532 * where some external control source the consumer is cooperating with 2533 * has caused the configured voltage to change. 2534 */ 2535int regulator_sync_voltage(struct regulator *regulator) 2536{ 2537 struct regulator_dev *rdev = regulator->rdev; 2538 int ret, min_uV, max_uV; 2539 2540 mutex_lock(&rdev->mutex); 2541 2542 if (!rdev->desc->ops->set_voltage && 2543 !rdev->desc->ops->set_voltage_sel) { 2544 ret = -EINVAL; 2545 goto out; 2546 } 2547 2548 /* This is only going to work if we've had a voltage configured. */ 2549 if (!regulator->min_uV && !regulator->max_uV) { 2550 ret = -EINVAL; 2551 goto out; 2552 } 2553 2554 min_uV = regulator->min_uV; 2555 max_uV = regulator->max_uV; 2556 2557 /* This should be a paranoia check... */ 2558 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2559 if (ret < 0) 2560 goto out; 2561 2562 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2563 if (ret < 0) 2564 goto out; 2565 2566 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2567 2568out: 2569 mutex_unlock(&rdev->mutex); 2570 return ret; 2571} 2572EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2573 2574static int _regulator_get_voltage(struct regulator_dev *rdev) 2575{ 2576 int sel, ret; 2577 2578 if (rdev->desc->ops->get_voltage_sel) { 2579 sel = rdev->desc->ops->get_voltage_sel(rdev); 2580 if (sel < 0) 2581 return sel; 2582 ret = rdev->desc->ops->list_voltage(rdev, sel); 2583 } else if (rdev->desc->ops->get_voltage) { 2584 ret = rdev->desc->ops->get_voltage(rdev); 2585 } else if (rdev->desc->ops->list_voltage) { 2586 ret = rdev->desc->ops->list_voltage(rdev, 0); 2587 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { 2588 ret = rdev->desc->fixed_uV; 2589 } else { 2590 return -EINVAL; 2591 } 2592 2593 if (ret < 0) 2594 return ret; 2595 return ret - rdev->constraints->uV_offset; 2596} 2597 2598/** 2599 * regulator_get_voltage - get regulator output voltage 2600 * @regulator: regulator source 2601 * 2602 * This returns the current regulator voltage in uV. 2603 * 2604 * NOTE: If the regulator is disabled it will return the voltage value. This 2605 * function should not be used to determine regulator state. 2606 */ 2607int regulator_get_voltage(struct regulator *regulator) 2608{ 2609 int ret; 2610 2611 mutex_lock(®ulator->rdev->mutex); 2612 2613 ret = _regulator_get_voltage(regulator->rdev); 2614 2615 mutex_unlock(®ulator->rdev->mutex); 2616 2617 return ret; 2618} 2619EXPORT_SYMBOL_GPL(regulator_get_voltage); 2620 2621/** 2622 * regulator_set_current_limit - set regulator output current limit 2623 * @regulator: regulator source 2624 * @min_uA: Minimum supported current in uA 2625 * @max_uA: Maximum supported current in uA 2626 * 2627 * Sets current sink to the desired output current. This can be set during 2628 * any regulator state. IOW, regulator can be disabled or enabled. 2629 * 2630 * If the regulator is enabled then the current will change to the new value 2631 * immediately otherwise if the regulator is disabled the regulator will 2632 * output at the new current when enabled. 2633 * 2634 * NOTE: Regulator system constraints must be set for this regulator before 2635 * calling this function otherwise this call will fail. 2636 */ 2637int regulator_set_current_limit(struct regulator *regulator, 2638 int min_uA, int max_uA) 2639{ 2640 struct regulator_dev *rdev = regulator->rdev; 2641 int ret; 2642 2643 mutex_lock(&rdev->mutex); 2644 2645 /* sanity check */ 2646 if (!rdev->desc->ops->set_current_limit) { 2647 ret = -EINVAL; 2648 goto out; 2649 } 2650 2651 /* constraints check */ 2652 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2653 if (ret < 0) 2654 goto out; 2655 2656 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2657out: 2658 mutex_unlock(&rdev->mutex); 2659 return ret; 2660} 2661EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2662 2663static int _regulator_get_current_limit(struct regulator_dev *rdev) 2664{ 2665 int ret; 2666 2667 mutex_lock(&rdev->mutex); 2668 2669 /* sanity check */ 2670 if (!rdev->desc->ops->get_current_limit) { 2671 ret = -EINVAL; 2672 goto out; 2673 } 2674 2675 ret = rdev->desc->ops->get_current_limit(rdev); 2676out: 2677 mutex_unlock(&rdev->mutex); 2678 return ret; 2679} 2680 2681/** 2682 * regulator_get_current_limit - get regulator output current 2683 * @regulator: regulator source 2684 * 2685 * This returns the current supplied by the specified current sink in uA. 2686 * 2687 * NOTE: If the regulator is disabled it will return the current value. This 2688 * function should not be used to determine regulator state. 2689 */ 2690int regulator_get_current_limit(struct regulator *regulator) 2691{ 2692 return _regulator_get_current_limit(regulator->rdev); 2693} 2694EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2695 2696/** 2697 * regulator_set_mode - set regulator operating mode 2698 * @regulator: regulator source 2699 * @mode: operating mode - one of the REGULATOR_MODE constants 2700 * 2701 * Set regulator operating mode to increase regulator efficiency or improve 2702 * regulation performance. 2703 * 2704 * NOTE: Regulator system constraints must be set for this regulator before 2705 * calling this function otherwise this call will fail. 2706 */ 2707int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2708{ 2709 struct regulator_dev *rdev = regulator->rdev; 2710 int ret; 2711 int regulator_curr_mode; 2712 2713 mutex_lock(&rdev->mutex); 2714 2715 /* sanity check */ 2716 if (!rdev->desc->ops->set_mode) { 2717 ret = -EINVAL; 2718 goto out; 2719 } 2720 2721 /* return if the same mode is requested */ 2722 if (rdev->desc->ops->get_mode) { 2723 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2724 if (regulator_curr_mode == mode) { 2725 ret = 0; 2726 goto out; 2727 } 2728 } 2729 2730 /* constraints check */ 2731 ret = regulator_mode_constrain(rdev, &mode); 2732 if (ret < 0) 2733 goto out; 2734 2735 ret = rdev->desc->ops->set_mode(rdev, mode); 2736out: 2737 mutex_unlock(&rdev->mutex); 2738 return ret; 2739} 2740EXPORT_SYMBOL_GPL(regulator_set_mode); 2741 2742static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2743{ 2744 int ret; 2745 2746 mutex_lock(&rdev->mutex); 2747 2748 /* sanity check */ 2749 if (!rdev->desc->ops->get_mode) { 2750 ret = -EINVAL; 2751 goto out; 2752 } 2753 2754 ret = rdev->desc->ops->get_mode(rdev); 2755out: 2756 mutex_unlock(&rdev->mutex); 2757 return ret; 2758} 2759 2760/** 2761 * regulator_get_mode - get regulator operating mode 2762 * @regulator: regulator source 2763 * 2764 * Get the current regulator operating mode. 2765 */ 2766unsigned int regulator_get_mode(struct regulator *regulator) 2767{ 2768 return _regulator_get_mode(regulator->rdev); 2769} 2770EXPORT_SYMBOL_GPL(regulator_get_mode); 2771 2772/** 2773 * regulator_set_optimum_mode - set regulator optimum operating mode 2774 * @regulator: regulator source 2775 * @uA_load: load current 2776 * 2777 * Notifies the regulator core of a new device load. This is then used by 2778 * DRMS (if enabled by constraints) to set the most efficient regulator 2779 * operating mode for the new regulator loading. 2780 * 2781 * Consumer devices notify their supply regulator of the maximum power 2782 * they will require (can be taken from device datasheet in the power 2783 * consumption tables) when they change operational status and hence power 2784 * state. Examples of operational state changes that can affect power 2785 * consumption are :- 2786 * 2787 * o Device is opened / closed. 2788 * o Device I/O is about to begin or has just finished. 2789 * o Device is idling in between work. 2790 * 2791 * This information is also exported via sysfs to userspace. 2792 * 2793 * DRMS will sum the total requested load on the regulator and change 2794 * to the most efficient operating mode if platform constraints allow. 2795 * 2796 * Returns the new regulator mode or error. 2797 */ 2798int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2799{ 2800 struct regulator_dev *rdev = regulator->rdev; 2801 struct regulator *consumer; 2802 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2803 unsigned int mode; 2804 2805 if (rdev->supply) 2806 input_uV = regulator_get_voltage(rdev->supply); 2807 2808 mutex_lock(&rdev->mutex); 2809 2810 /* 2811 * first check to see if we can set modes at all, otherwise just 2812 * tell the consumer everything is OK. 2813 */ 2814 regulator->uA_load = uA_load; 2815 ret = regulator_check_drms(rdev); 2816 if (ret < 0) { 2817 ret = 0; 2818 goto out; 2819 } 2820 2821 if (!rdev->desc->ops->get_optimum_mode) 2822 goto out; 2823 2824 /* 2825 * we can actually do this so any errors are indicators of 2826 * potential real failure. 2827 */ 2828 ret = -EINVAL; 2829 2830 if (!rdev->desc->ops->set_mode) 2831 goto out; 2832 2833 /* get output voltage */ 2834 output_uV = _regulator_get_voltage(rdev); 2835 if (output_uV <= 0) { 2836 rdev_err(rdev, "invalid output voltage found\n"); 2837 goto out; 2838 } 2839 2840 /* No supply? Use constraint voltage */ 2841 if (input_uV <= 0) 2842 input_uV = rdev->constraints->input_uV; 2843 if (input_uV <= 0) { 2844 rdev_err(rdev, "invalid input voltage found\n"); 2845 goto out; 2846 } 2847 2848 /* calc total requested load for this regulator */ 2849 list_for_each_entry(consumer, &rdev->consumer_list, list) 2850 total_uA_load += consumer->uA_load; 2851 2852 mode = rdev->desc->ops->get_optimum_mode(rdev, 2853 input_uV, output_uV, 2854 total_uA_load); 2855 ret = regulator_mode_constrain(rdev, &mode); 2856 if (ret < 0) { 2857 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2858 total_uA_load, input_uV, output_uV); 2859 goto out; 2860 } 2861 2862 ret = rdev->desc->ops->set_mode(rdev, mode); 2863 if (ret < 0) { 2864 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2865 goto out; 2866 } 2867 ret = mode; 2868out: 2869 mutex_unlock(&rdev->mutex); 2870 return ret; 2871} 2872EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2873 2874/** 2875 * regulator_allow_bypass - allow the regulator to go into bypass mode 2876 * 2877 * @regulator: Regulator to configure 2878 * @enable: enable or disable bypass mode 2879 * 2880 * Allow the regulator to go into bypass mode if all other consumers 2881 * for the regulator also enable bypass mode and the machine 2882 * constraints allow this. Bypass mode means that the regulator is 2883 * simply passing the input directly to the output with no regulation. 2884 */ 2885int regulator_allow_bypass(struct regulator *regulator, bool enable) 2886{ 2887 struct regulator_dev *rdev = regulator->rdev; 2888 int ret = 0; 2889 2890 if (!rdev->desc->ops->set_bypass) 2891 return 0; 2892 2893 if (rdev->constraints && 2894 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2895 return 0; 2896 2897 mutex_lock(&rdev->mutex); 2898 2899 if (enable && !regulator->bypass) { 2900 rdev->bypass_count++; 2901 2902 if (rdev->bypass_count == rdev->open_count) { 2903 ret = rdev->desc->ops->set_bypass(rdev, enable); 2904 if (ret != 0) 2905 rdev->bypass_count--; 2906 } 2907 2908 } else if (!enable && regulator->bypass) { 2909 rdev->bypass_count--; 2910 2911 if (rdev->bypass_count != rdev->open_count) { 2912 ret = rdev->desc->ops->set_bypass(rdev, enable); 2913 if (ret != 0) 2914 rdev->bypass_count++; 2915 } 2916 } 2917 2918 if (ret == 0) 2919 regulator->bypass = enable; 2920 2921 mutex_unlock(&rdev->mutex); 2922 2923 return ret; 2924} 2925EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2926 2927/** 2928 * regulator_register_notifier - register regulator event notifier 2929 * @regulator: regulator source 2930 * @nb: notifier block 2931 * 2932 * Register notifier block to receive regulator events. 2933 */ 2934int regulator_register_notifier(struct regulator *regulator, 2935 struct notifier_block *nb) 2936{ 2937 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2938 nb); 2939} 2940EXPORT_SYMBOL_GPL(regulator_register_notifier); 2941 2942/** 2943 * regulator_unregister_notifier - unregister regulator event notifier 2944 * @regulator: regulator source 2945 * @nb: notifier block 2946 * 2947 * Unregister regulator event notifier block. 2948 */ 2949int regulator_unregister_notifier(struct regulator *regulator, 2950 struct notifier_block *nb) 2951{ 2952 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2953 nb); 2954} 2955EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2956 2957/* notify regulator consumers and downstream regulator consumers. 2958 * Note mutex must be held by caller. 2959 */ 2960static void _notifier_call_chain(struct regulator_dev *rdev, 2961 unsigned long event, void *data) 2962{ 2963 /* call rdev chain first */ 2964 blocking_notifier_call_chain(&rdev->notifier, event, data); 2965} 2966 2967/** 2968 * regulator_bulk_get - get multiple regulator consumers 2969 * 2970 * @dev: Device to supply 2971 * @num_consumers: Number of consumers to register 2972 * @consumers: Configuration of consumers; clients are stored here. 2973 * 2974 * @return 0 on success, an errno on failure. 2975 * 2976 * This helper function allows drivers to get several regulator 2977 * consumers in one operation. If any of the regulators cannot be 2978 * acquired then any regulators that were allocated will be freed 2979 * before returning to the caller. 2980 */ 2981int regulator_bulk_get(struct device *dev, int num_consumers, 2982 struct regulator_bulk_data *consumers) 2983{ 2984 int i; 2985 int ret; 2986 2987 for (i = 0; i < num_consumers; i++) 2988 consumers[i].consumer = NULL; 2989 2990 for (i = 0; i < num_consumers; i++) { 2991 consumers[i].consumer = regulator_get(dev, 2992 consumers[i].supply); 2993 if (IS_ERR(consumers[i].consumer)) { 2994 ret = PTR_ERR(consumers[i].consumer); 2995 dev_err(dev, "Failed to get supply '%s': %d\n", 2996 consumers[i].supply, ret); 2997 consumers[i].consumer = NULL; 2998 goto err; 2999 } 3000 } 3001 3002 return 0; 3003 3004err: 3005 while (--i >= 0) 3006 regulator_put(consumers[i].consumer); 3007 3008 return ret; 3009} 3010EXPORT_SYMBOL_GPL(regulator_bulk_get); 3011 3012static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3013{ 3014 struct regulator_bulk_data *bulk = data; 3015 3016 bulk->ret = regulator_enable(bulk->consumer); 3017} 3018 3019/** 3020 * regulator_bulk_enable - enable multiple regulator consumers 3021 * 3022 * @num_consumers: Number of consumers 3023 * @consumers: Consumer data; clients are stored here. 3024 * @return 0 on success, an errno on failure 3025 * 3026 * This convenience API allows consumers to enable multiple regulator 3027 * clients in a single API call. If any consumers cannot be enabled 3028 * then any others that were enabled will be disabled again prior to 3029 * return. 3030 */ 3031int regulator_bulk_enable(int num_consumers, 3032 struct regulator_bulk_data *consumers) 3033{ 3034 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3035 int i; 3036 int ret = 0; 3037 3038 for (i = 0; i < num_consumers; i++) { 3039 if (consumers[i].consumer->always_on) 3040 consumers[i].ret = 0; 3041 else 3042 async_schedule_domain(regulator_bulk_enable_async, 3043 &consumers[i], &async_domain); 3044 } 3045 3046 async_synchronize_full_domain(&async_domain); 3047 3048 /* If any consumer failed we need to unwind any that succeeded */ 3049 for (i = 0; i < num_consumers; i++) { 3050 if (consumers[i].ret != 0) { 3051 ret = consumers[i].ret; 3052 goto err; 3053 } 3054 } 3055 3056 return 0; 3057 3058err: 3059 for (i = 0; i < num_consumers; i++) { 3060 if (consumers[i].ret < 0) 3061 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3062 consumers[i].ret); 3063 else 3064 regulator_disable(consumers[i].consumer); 3065 } 3066 3067 return ret; 3068} 3069EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3070 3071/** 3072 * regulator_bulk_disable - disable multiple regulator consumers 3073 * 3074 * @num_consumers: Number of consumers 3075 * @consumers: Consumer data; clients are stored here. 3076 * @return 0 on success, an errno on failure 3077 * 3078 * This convenience API allows consumers to disable multiple regulator 3079 * clients in a single API call. If any consumers cannot be disabled 3080 * then any others that were disabled will be enabled again prior to 3081 * return. 3082 */ 3083int regulator_bulk_disable(int num_consumers, 3084 struct regulator_bulk_data *consumers) 3085{ 3086 int i; 3087 int ret, r; 3088 3089 for (i = num_consumers - 1; i >= 0; --i) { 3090 ret = regulator_disable(consumers[i].consumer); 3091 if (ret != 0) 3092 goto err; 3093 } 3094 3095 return 0; 3096 3097err: 3098 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3099 for (++i; i < num_consumers; ++i) { 3100 r = regulator_enable(consumers[i].consumer); 3101 if (r != 0) 3102 pr_err("Failed to reename %s: %d\n", 3103 consumers[i].supply, r); 3104 } 3105 3106 return ret; 3107} 3108EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3109 3110/** 3111 * regulator_bulk_force_disable - force disable multiple regulator consumers 3112 * 3113 * @num_consumers: Number of consumers 3114 * @consumers: Consumer data; clients are stored here. 3115 * @return 0 on success, an errno on failure 3116 * 3117 * This convenience API allows consumers to forcibly disable multiple regulator 3118 * clients in a single API call. 3119 * NOTE: This should be used for situations when device damage will 3120 * likely occur if the regulators are not disabled (e.g. over temp). 3121 * Although regulator_force_disable function call for some consumers can 3122 * return error numbers, the function is called for all consumers. 3123 */ 3124int regulator_bulk_force_disable(int num_consumers, 3125 struct regulator_bulk_data *consumers) 3126{ 3127 int i; 3128 int ret; 3129 3130 for (i = 0; i < num_consumers; i++) 3131 consumers[i].ret = 3132 regulator_force_disable(consumers[i].consumer); 3133 3134 for (i = 0; i < num_consumers; i++) { 3135 if (consumers[i].ret != 0) { 3136 ret = consumers[i].ret; 3137 goto out; 3138 } 3139 } 3140 3141 return 0; 3142out: 3143 return ret; 3144} 3145EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3146 3147/** 3148 * regulator_bulk_free - free multiple regulator consumers 3149 * 3150 * @num_consumers: Number of consumers 3151 * @consumers: Consumer data; clients are stored here. 3152 * 3153 * This convenience API allows consumers to free multiple regulator 3154 * clients in a single API call. 3155 */ 3156void regulator_bulk_free(int num_consumers, 3157 struct regulator_bulk_data *consumers) 3158{ 3159 int i; 3160 3161 for (i = 0; i < num_consumers; i++) { 3162 regulator_put(consumers[i].consumer); 3163 consumers[i].consumer = NULL; 3164 } 3165} 3166EXPORT_SYMBOL_GPL(regulator_bulk_free); 3167 3168/** 3169 * regulator_notifier_call_chain - call regulator event notifier 3170 * @rdev: regulator source 3171 * @event: notifier block 3172 * @data: callback-specific data. 3173 * 3174 * Called by regulator drivers to notify clients a regulator event has 3175 * occurred. We also notify regulator clients downstream. 3176 * Note lock must be held by caller. 3177 */ 3178int regulator_notifier_call_chain(struct regulator_dev *rdev, 3179 unsigned long event, void *data) 3180{ 3181 _notifier_call_chain(rdev, event, data); 3182 return NOTIFY_DONE; 3183 3184} 3185EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3186 3187/** 3188 * regulator_mode_to_status - convert a regulator mode into a status 3189 * 3190 * @mode: Mode to convert 3191 * 3192 * Convert a regulator mode into a status. 3193 */ 3194int regulator_mode_to_status(unsigned int mode) 3195{ 3196 switch (mode) { 3197 case REGULATOR_MODE_FAST: 3198 return REGULATOR_STATUS_FAST; 3199 case REGULATOR_MODE_NORMAL: 3200 return REGULATOR_STATUS_NORMAL; 3201 case REGULATOR_MODE_IDLE: 3202 return REGULATOR_STATUS_IDLE; 3203 case REGULATOR_MODE_STANDBY: 3204 return REGULATOR_STATUS_STANDBY; 3205 default: 3206 return REGULATOR_STATUS_UNDEFINED; 3207 } 3208} 3209EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3210 3211/* 3212 * To avoid cluttering sysfs (and memory) with useless state, only 3213 * create attributes that can be meaningfully displayed. 3214 */ 3215static int add_regulator_attributes(struct regulator_dev *rdev) 3216{ 3217 struct device *dev = &rdev->dev; 3218 struct regulator_ops *ops = rdev->desc->ops; 3219 int status = 0; 3220 3221 /* some attributes need specific methods to be displayed */ 3222 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3223 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3224 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || 3225 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { 3226 status = device_create_file(dev, &dev_attr_microvolts); 3227 if (status < 0) 3228 return status; 3229 } 3230 if (ops->get_current_limit) { 3231 status = device_create_file(dev, &dev_attr_microamps); 3232 if (status < 0) 3233 return status; 3234 } 3235 if (ops->get_mode) { 3236 status = device_create_file(dev, &dev_attr_opmode); 3237 if (status < 0) 3238 return status; 3239 } 3240 if (rdev->ena_pin || ops->is_enabled) { 3241 status = device_create_file(dev, &dev_attr_state); 3242 if (status < 0) 3243 return status; 3244 } 3245 if (ops->get_status) { 3246 status = device_create_file(dev, &dev_attr_status); 3247 if (status < 0) 3248 return status; 3249 } 3250 if (ops->get_bypass) { 3251 status = device_create_file(dev, &dev_attr_bypass); 3252 if (status < 0) 3253 return status; 3254 } 3255 3256 /* some attributes are type-specific */ 3257 if (rdev->desc->type == REGULATOR_CURRENT) { 3258 status = device_create_file(dev, &dev_attr_requested_microamps); 3259 if (status < 0) 3260 return status; 3261 } 3262 3263 /* all the other attributes exist to support constraints; 3264 * don't show them if there are no constraints, or if the 3265 * relevant supporting methods are missing. 3266 */ 3267 if (!rdev->constraints) 3268 return status; 3269 3270 /* constraints need specific supporting methods */ 3271 if (ops->set_voltage || ops->set_voltage_sel) { 3272 status = device_create_file(dev, &dev_attr_min_microvolts); 3273 if (status < 0) 3274 return status; 3275 status = device_create_file(dev, &dev_attr_max_microvolts); 3276 if (status < 0) 3277 return status; 3278 } 3279 if (ops->set_current_limit) { 3280 status = device_create_file(dev, &dev_attr_min_microamps); 3281 if (status < 0) 3282 return status; 3283 status = device_create_file(dev, &dev_attr_max_microamps); 3284 if (status < 0) 3285 return status; 3286 } 3287 3288 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3289 if (status < 0) 3290 return status; 3291 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3292 if (status < 0) 3293 return status; 3294 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3295 if (status < 0) 3296 return status; 3297 3298 if (ops->set_suspend_voltage) { 3299 status = device_create_file(dev, 3300 &dev_attr_suspend_standby_microvolts); 3301 if (status < 0) 3302 return status; 3303 status = device_create_file(dev, 3304 &dev_attr_suspend_mem_microvolts); 3305 if (status < 0) 3306 return status; 3307 status = device_create_file(dev, 3308 &dev_attr_suspend_disk_microvolts); 3309 if (status < 0) 3310 return status; 3311 } 3312 3313 if (ops->set_suspend_mode) { 3314 status = device_create_file(dev, 3315 &dev_attr_suspend_standby_mode); 3316 if (status < 0) 3317 return status; 3318 status = device_create_file(dev, 3319 &dev_attr_suspend_mem_mode); 3320 if (status < 0) 3321 return status; 3322 status = device_create_file(dev, 3323 &dev_attr_suspend_disk_mode); 3324 if (status < 0) 3325 return status; 3326 } 3327 3328 return status; 3329} 3330 3331static void rdev_init_debugfs(struct regulator_dev *rdev) 3332{ 3333 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3334 if (!rdev->debugfs) { 3335 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3336 return; 3337 } 3338 3339 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3340 &rdev->use_count); 3341 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3342 &rdev->open_count); 3343 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3344 &rdev->bypass_count); 3345} 3346 3347/** 3348 * regulator_register - register regulator 3349 * @regulator_desc: regulator to register 3350 * @config: runtime configuration for regulator 3351 * 3352 * Called by regulator drivers to register a regulator. 3353 * Returns a valid pointer to struct regulator_dev on success 3354 * or an ERR_PTR() on error. 3355 */ 3356struct regulator_dev * 3357regulator_register(const struct regulator_desc *regulator_desc, 3358 const struct regulator_config *config) 3359{ 3360 const struct regulation_constraints *constraints = NULL; 3361 const struct regulator_init_data *init_data; 3362 static atomic_t regulator_no = ATOMIC_INIT(0); 3363 struct regulator_dev *rdev; 3364 struct device *dev; 3365 int ret, i; 3366 const char *supply = NULL; 3367 3368 if (regulator_desc == NULL || config == NULL) 3369 return ERR_PTR(-EINVAL); 3370 3371 dev = config->dev; 3372 WARN_ON(!dev); 3373 3374 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3375 return ERR_PTR(-EINVAL); 3376 3377 if (regulator_desc->type != REGULATOR_VOLTAGE && 3378 regulator_desc->type != REGULATOR_CURRENT) 3379 return ERR_PTR(-EINVAL); 3380 3381 /* Only one of each should be implemented */ 3382 WARN_ON(regulator_desc->ops->get_voltage && 3383 regulator_desc->ops->get_voltage_sel); 3384 WARN_ON(regulator_desc->ops->set_voltage && 3385 regulator_desc->ops->set_voltage_sel); 3386 3387 /* If we're using selectors we must implement list_voltage. */ 3388 if (regulator_desc->ops->get_voltage_sel && 3389 !regulator_desc->ops->list_voltage) { 3390 return ERR_PTR(-EINVAL); 3391 } 3392 if (regulator_desc->ops->set_voltage_sel && 3393 !regulator_desc->ops->list_voltage) { 3394 return ERR_PTR(-EINVAL); 3395 } 3396 3397 init_data = config->init_data; 3398 3399 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3400 if (rdev == NULL) 3401 return ERR_PTR(-ENOMEM); 3402 3403 mutex_lock(®ulator_list_mutex); 3404 3405 mutex_init(&rdev->mutex); 3406 rdev->reg_data = config->driver_data; 3407 rdev->owner = regulator_desc->owner; 3408 rdev->desc = regulator_desc; 3409 if (config->regmap) 3410 rdev->regmap = config->regmap; 3411 else if (dev_get_regmap(dev, NULL)) 3412 rdev->regmap = dev_get_regmap(dev, NULL); 3413 else if (dev->parent) 3414 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3415 INIT_LIST_HEAD(&rdev->consumer_list); 3416 INIT_LIST_HEAD(&rdev->list); 3417 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3418 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3419 3420 /* preform any regulator specific init */ 3421 if (init_data && init_data->regulator_init) { 3422 ret = init_data->regulator_init(rdev->reg_data); 3423 if (ret < 0) 3424 goto clean; 3425 } 3426 3427 /* register with sysfs */ 3428 rdev->dev.class = ®ulator_class; 3429 rdev->dev.of_node = config->of_node; 3430 rdev->dev.parent = dev; 3431 dev_set_name(&rdev->dev, "regulator.%d", 3432 atomic_inc_return(®ulator_no) - 1); 3433 ret = device_register(&rdev->dev); 3434 if (ret != 0) { 3435 put_device(&rdev->dev); 3436 goto clean; 3437 } 3438 3439 dev_set_drvdata(&rdev->dev, rdev); 3440 3441 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3442 ret = regulator_ena_gpio_request(rdev, config); 3443 if (ret != 0) { 3444 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3445 config->ena_gpio, ret); 3446 goto wash; 3447 } 3448 3449 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3450 rdev->ena_gpio_state = 1; 3451 3452 if (config->ena_gpio_invert) 3453 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3454 } 3455 3456 /* set regulator constraints */ 3457 if (init_data) 3458 constraints = &init_data->constraints; 3459 3460 ret = set_machine_constraints(rdev, constraints); 3461 if (ret < 0) 3462 goto scrub; 3463 3464 /* add attributes supported by this regulator */ 3465 ret = add_regulator_attributes(rdev); 3466 if (ret < 0) 3467 goto scrub; 3468 3469 if (init_data && init_data->supply_regulator) 3470 supply = init_data->supply_regulator; 3471 else if (regulator_desc->supply_name) 3472 supply = regulator_desc->supply_name; 3473 3474 if (supply) { 3475 struct regulator_dev *r; 3476 3477 r = regulator_dev_lookup(dev, supply, &ret); 3478 3479 if (ret == -ENODEV) { 3480 /* 3481 * No supply was specified for this regulator and 3482 * there will never be one. 3483 */ 3484 ret = 0; 3485 goto add_dev; 3486 } else if (!r) { 3487 dev_err(dev, "Failed to find supply %s\n", supply); 3488 ret = -EPROBE_DEFER; 3489 goto scrub; 3490 } 3491 3492 ret = set_supply(rdev, r); 3493 if (ret < 0) 3494 goto scrub; 3495 3496 /* Enable supply if rail is enabled */ 3497 if (_regulator_is_enabled(rdev)) { 3498 ret = regulator_enable(rdev->supply); 3499 if (ret < 0) 3500 goto scrub; 3501 } 3502 } 3503 3504add_dev: 3505 /* add consumers devices */ 3506 if (init_data) { 3507 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3508 ret = set_consumer_device_supply(rdev, 3509 init_data->consumer_supplies[i].dev_name, 3510 init_data->consumer_supplies[i].supply); 3511 if (ret < 0) { 3512 dev_err(dev, "Failed to set supply %s\n", 3513 init_data->consumer_supplies[i].supply); 3514 goto unset_supplies; 3515 } 3516 } 3517 } 3518 3519 list_add(&rdev->list, ®ulator_list); 3520 3521 rdev_init_debugfs(rdev); 3522out: 3523 mutex_unlock(®ulator_list_mutex); 3524 return rdev; 3525 3526unset_supplies: 3527 unset_regulator_supplies(rdev); 3528 3529scrub: 3530 if (rdev->supply) 3531 _regulator_put(rdev->supply); 3532 regulator_ena_gpio_free(rdev); 3533 kfree(rdev->constraints); 3534wash: 3535 device_unregister(&rdev->dev); 3536 /* device core frees rdev */ 3537 rdev = ERR_PTR(ret); 3538 goto out; 3539 3540clean: 3541 kfree(rdev); 3542 rdev = ERR_PTR(ret); 3543 goto out; 3544} 3545EXPORT_SYMBOL_GPL(regulator_register); 3546 3547/** 3548 * regulator_unregister - unregister regulator 3549 * @rdev: regulator to unregister 3550 * 3551 * Called by regulator drivers to unregister a regulator. 3552 */ 3553void regulator_unregister(struct regulator_dev *rdev) 3554{ 3555 if (rdev == NULL) 3556 return; 3557 3558 if (rdev->supply) { 3559 while (rdev->use_count--) 3560 regulator_disable(rdev->supply); 3561 regulator_put(rdev->supply); 3562 } 3563 mutex_lock(®ulator_list_mutex); 3564 debugfs_remove_recursive(rdev->debugfs); 3565 flush_work(&rdev->disable_work.work); 3566 WARN_ON(rdev->open_count); 3567 unset_regulator_supplies(rdev); 3568 list_del(&rdev->list); 3569 kfree(rdev->constraints); 3570 regulator_ena_gpio_free(rdev); 3571 device_unregister(&rdev->dev); 3572 mutex_unlock(®ulator_list_mutex); 3573} 3574EXPORT_SYMBOL_GPL(regulator_unregister); 3575 3576/** 3577 * regulator_suspend_prepare - prepare regulators for system wide suspend 3578 * @state: system suspend state 3579 * 3580 * Configure each regulator with it's suspend operating parameters for state. 3581 * This will usually be called by machine suspend code prior to supending. 3582 */ 3583int regulator_suspend_prepare(suspend_state_t state) 3584{ 3585 struct regulator_dev *rdev; 3586 int ret = 0; 3587 3588 /* ON is handled by regulator active state */ 3589 if (state == PM_SUSPEND_ON) 3590 return -EINVAL; 3591 3592 mutex_lock(®ulator_list_mutex); 3593 list_for_each_entry(rdev, ®ulator_list, list) { 3594 3595 mutex_lock(&rdev->mutex); 3596 ret = suspend_prepare(rdev, state); 3597 mutex_unlock(&rdev->mutex); 3598 3599 if (ret < 0) { 3600 rdev_err(rdev, "failed to prepare\n"); 3601 goto out; 3602 } 3603 } 3604out: 3605 mutex_unlock(®ulator_list_mutex); 3606 return ret; 3607} 3608EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3609 3610/** 3611 * regulator_suspend_finish - resume regulators from system wide suspend 3612 * 3613 * Turn on regulators that might be turned off by regulator_suspend_prepare 3614 * and that should be turned on according to the regulators properties. 3615 */ 3616int regulator_suspend_finish(void) 3617{ 3618 struct regulator_dev *rdev; 3619 int ret = 0, error; 3620 3621 mutex_lock(®ulator_list_mutex); 3622 list_for_each_entry(rdev, ®ulator_list, list) { 3623 struct regulator_ops *ops = rdev->desc->ops; 3624 3625 mutex_lock(&rdev->mutex); 3626 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3627 ops->enable) { 3628 error = ops->enable(rdev); 3629 if (error) 3630 ret = error; 3631 } else { 3632 if (!have_full_constraints()) 3633 goto unlock; 3634 if (!ops->disable) 3635 goto unlock; 3636 if (!_regulator_is_enabled(rdev)) 3637 goto unlock; 3638 3639 error = ops->disable(rdev); 3640 if (error) 3641 ret = error; 3642 } 3643unlock: 3644 mutex_unlock(&rdev->mutex); 3645 } 3646 mutex_unlock(®ulator_list_mutex); 3647 return ret; 3648} 3649EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3650 3651/** 3652 * regulator_has_full_constraints - the system has fully specified constraints 3653 * 3654 * Calling this function will cause the regulator API to disable all 3655 * regulators which have a zero use count and don't have an always_on 3656 * constraint in a late_initcall. 3657 * 3658 * The intention is that this will become the default behaviour in a 3659 * future kernel release so users are encouraged to use this facility 3660 * now. 3661 */ 3662void regulator_has_full_constraints(void) 3663{ 3664 has_full_constraints = 1; 3665} 3666EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3667 3668/** 3669 * rdev_get_drvdata - get rdev regulator driver data 3670 * @rdev: regulator 3671 * 3672 * Get rdev regulator driver private data. This call can be used in the 3673 * regulator driver context. 3674 */ 3675void *rdev_get_drvdata(struct regulator_dev *rdev) 3676{ 3677 return rdev->reg_data; 3678} 3679EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3680 3681/** 3682 * regulator_get_drvdata - get regulator driver data 3683 * @regulator: regulator 3684 * 3685 * Get regulator driver private data. This call can be used in the consumer 3686 * driver context when non API regulator specific functions need to be called. 3687 */ 3688void *regulator_get_drvdata(struct regulator *regulator) 3689{ 3690 return regulator->rdev->reg_data; 3691} 3692EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3693 3694/** 3695 * regulator_set_drvdata - set regulator driver data 3696 * @regulator: regulator 3697 * @data: data 3698 */ 3699void regulator_set_drvdata(struct regulator *regulator, void *data) 3700{ 3701 regulator->rdev->reg_data = data; 3702} 3703EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3704 3705/** 3706 * regulator_get_id - get regulator ID 3707 * @rdev: regulator 3708 */ 3709int rdev_get_id(struct regulator_dev *rdev) 3710{ 3711 return rdev->desc->id; 3712} 3713EXPORT_SYMBOL_GPL(rdev_get_id); 3714 3715struct device *rdev_get_dev(struct regulator_dev *rdev) 3716{ 3717 return &rdev->dev; 3718} 3719EXPORT_SYMBOL_GPL(rdev_get_dev); 3720 3721void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3722{ 3723 return reg_init_data->driver_data; 3724} 3725EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3726 3727#ifdef CONFIG_DEBUG_FS 3728static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3729 size_t count, loff_t *ppos) 3730{ 3731 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3732 ssize_t len, ret = 0; 3733 struct regulator_map *map; 3734 3735 if (!buf) 3736 return -ENOMEM; 3737 3738 list_for_each_entry(map, ®ulator_map_list, list) { 3739 len = snprintf(buf + ret, PAGE_SIZE - ret, 3740 "%s -> %s.%s\n", 3741 rdev_get_name(map->regulator), map->dev_name, 3742 map->supply); 3743 if (len >= 0) 3744 ret += len; 3745 if (ret > PAGE_SIZE) { 3746 ret = PAGE_SIZE; 3747 break; 3748 } 3749 } 3750 3751 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3752 3753 kfree(buf); 3754 3755 return ret; 3756} 3757#endif 3758 3759static const struct file_operations supply_map_fops = { 3760#ifdef CONFIG_DEBUG_FS 3761 .read = supply_map_read_file, 3762 .llseek = default_llseek, 3763#endif 3764}; 3765 3766static int __init regulator_init(void) 3767{ 3768 int ret; 3769 3770 ret = class_register(®ulator_class); 3771 3772 debugfs_root = debugfs_create_dir("regulator", NULL); 3773 if (!debugfs_root) 3774 pr_warn("regulator: Failed to create debugfs directory\n"); 3775 3776 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3777 &supply_map_fops); 3778 3779 regulator_dummy_init(); 3780 3781 return ret; 3782} 3783 3784/* init early to allow our consumers to complete system booting */ 3785core_initcall(regulator_init); 3786 3787static int __init regulator_init_complete(void) 3788{ 3789 struct regulator_dev *rdev; 3790 struct regulator_ops *ops; 3791 struct regulation_constraints *c; 3792 int enabled, ret; 3793 3794 /* 3795 * Since DT doesn't provide an idiomatic mechanism for 3796 * enabling full constraints and since it's much more natural 3797 * with DT to provide them just assume that a DT enabled 3798 * system has full constraints. 3799 */ 3800 if (of_have_populated_dt()) 3801 has_full_constraints = true; 3802 3803 mutex_lock(®ulator_list_mutex); 3804 3805 /* If we have a full configuration then disable any regulators 3806 * which are not in use or always_on. This will become the 3807 * default behaviour in the future. 3808 */ 3809 list_for_each_entry(rdev, ®ulator_list, list) { 3810 ops = rdev->desc->ops; 3811 c = rdev->constraints; 3812 3813 if (!ops->disable || (c && c->always_on)) 3814 continue; 3815 3816 mutex_lock(&rdev->mutex); 3817 3818 if (rdev->use_count) 3819 goto unlock; 3820 3821 /* If we can't read the status assume it's on. */ 3822 if (ops->is_enabled) 3823 enabled = ops->is_enabled(rdev); 3824 else 3825 enabled = 1; 3826 3827 if (!enabled) 3828 goto unlock; 3829 3830 if (have_full_constraints()) { 3831 /* We log since this may kill the system if it 3832 * goes wrong. */ 3833 rdev_info(rdev, "disabling\n"); 3834 ret = ops->disable(rdev); 3835 if (ret != 0) { 3836 rdev_err(rdev, "couldn't disable: %d\n", ret); 3837 } 3838 } else { 3839 /* The intention is that in future we will 3840 * assume that full constraints are provided 3841 * so warn even if we aren't going to do 3842 * anything here. 3843 */ 3844 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3845 } 3846 3847unlock: 3848 mutex_unlock(&rdev->mutex); 3849 } 3850 3851 mutex_unlock(®ulator_list_mutex); 3852 3853 return 0; 3854} 3855late_initcall(regulator_init_complete); 3856