core.c revision 0781719bd6614e60dd5fff1b5cd45dbce2f7dd2d
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39#include "internal.h" 40 41#define rdev_crit(rdev, fmt, ...) \ 42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_err(rdev, fmt, ...) \ 44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_warn(rdev, fmt, ...) \ 46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_info(rdev, fmt, ...) \ 48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49#define rdev_dbg(rdev, fmt, ...) \ 50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 51 52static DEFINE_MUTEX(regulator_list_mutex); 53static LIST_HEAD(regulator_list); 54static LIST_HEAD(regulator_map_list); 55static LIST_HEAD(regulator_ena_gpio_list); 56static LIST_HEAD(regulator_supply_alias_list); 57static bool has_full_constraints; 58 59static struct dentry *debugfs_root; 60 61/* 62 * struct regulator_map 63 * 64 * Used to provide symbolic supply names to devices. 65 */ 66struct regulator_map { 67 struct list_head list; 68 const char *dev_name; /* The dev_name() for the consumer */ 69 const char *supply; 70 struct regulator_dev *regulator; 71}; 72 73/* 74 * struct regulator_enable_gpio 75 * 76 * Management for shared enable GPIO pin 77 */ 78struct regulator_enable_gpio { 79 struct list_head list; 80 int gpio; 81 u32 enable_count; /* a number of enabled shared GPIO */ 82 u32 request_count; /* a number of requested shared GPIO */ 83 unsigned int ena_gpio_invert:1; 84}; 85 86/* 87 * struct regulator_supply_alias 88 * 89 * Used to map lookups for a supply onto an alternative device. 90 */ 91struct regulator_supply_alias { 92 struct list_head list; 93 struct device *src_dev; 94 const char *src_supply; 95 struct device *alias_dev; 96 const char *alias_supply; 97}; 98 99static int _regulator_is_enabled(struct regulator_dev *rdev); 100static int _regulator_disable(struct regulator_dev *rdev); 101static int _regulator_get_voltage(struct regulator_dev *rdev); 102static int _regulator_get_current_limit(struct regulator_dev *rdev); 103static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 104static void _notifier_call_chain(struct regulator_dev *rdev, 105 unsigned long event, void *data); 106static int _regulator_do_set_voltage(struct regulator_dev *rdev, 107 int min_uV, int max_uV); 108static struct regulator *create_regulator(struct regulator_dev *rdev, 109 struct device *dev, 110 const char *supply_name); 111 112static const char *rdev_get_name(struct regulator_dev *rdev) 113{ 114 if (rdev->constraints && rdev->constraints->name) 115 return rdev->constraints->name; 116 else if (rdev->desc->name) 117 return rdev->desc->name; 118 else 119 return ""; 120} 121 122static bool have_full_constraints(void) 123{ 124 return has_full_constraints || of_have_populated_dt(); 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t name_show(struct device *dev, struct device_attribute *attr, 327 char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333static DEVICE_ATTR_RO(name); 334 335static ssize_t regulator_print_opmode(char *buf, int mode) 336{ 337 switch (mode) { 338 case REGULATOR_MODE_FAST: 339 return sprintf(buf, "fast\n"); 340 case REGULATOR_MODE_NORMAL: 341 return sprintf(buf, "normal\n"); 342 case REGULATOR_MODE_IDLE: 343 return sprintf(buf, "idle\n"); 344 case REGULATOR_MODE_STANDBY: 345 return sprintf(buf, "standby\n"); 346 } 347 return sprintf(buf, "unknown\n"); 348} 349 350static ssize_t regulator_opmode_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352{ 353 struct regulator_dev *rdev = dev_get_drvdata(dev); 354 355 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 356} 357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 358 359static ssize_t regulator_print_state(char *buf, int state) 360{ 361 if (state > 0) 362 return sprintf(buf, "enabled\n"); 363 else if (state == 0) 364 return sprintf(buf, "disabled\n"); 365 else 366 return sprintf(buf, "unknown\n"); 367} 368 369static ssize_t regulator_state_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct regulator_dev *rdev = dev_get_drvdata(dev); 373 ssize_t ret; 374 375 mutex_lock(&rdev->mutex); 376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 377 mutex_unlock(&rdev->mutex); 378 379 return ret; 380} 381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 382 383static ssize_t regulator_status_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 int status; 388 char *label; 389 390 status = rdev->desc->ops->get_status(rdev); 391 if (status < 0) 392 return status; 393 394 switch (status) { 395 case REGULATOR_STATUS_OFF: 396 label = "off"; 397 break; 398 case REGULATOR_STATUS_ON: 399 label = "on"; 400 break; 401 case REGULATOR_STATUS_ERROR: 402 label = "error"; 403 break; 404 case REGULATOR_STATUS_FAST: 405 label = "fast"; 406 break; 407 case REGULATOR_STATUS_NORMAL: 408 label = "normal"; 409 break; 410 case REGULATOR_STATUS_IDLE: 411 label = "idle"; 412 break; 413 case REGULATOR_STATUS_STANDBY: 414 label = "standby"; 415 break; 416 case REGULATOR_STATUS_BYPASS: 417 label = "bypass"; 418 break; 419 case REGULATOR_STATUS_UNDEFINED: 420 label = "undefined"; 421 break; 422 default: 423 return -ERANGE; 424 } 425 426 return sprintf(buf, "%s\n", label); 427} 428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 429 430static ssize_t regulator_min_uA_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432{ 433 struct regulator_dev *rdev = dev_get_drvdata(dev); 434 435 if (!rdev->constraints) 436 return sprintf(buf, "constraint not defined\n"); 437 438 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 439} 440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 441 442static ssize_t regulator_max_uA_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 if (!rdev->constraints) 448 return sprintf(buf, "constraint not defined\n"); 449 450 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 451} 452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 453 454static ssize_t regulator_min_uV_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 if (!rdev->constraints) 460 return sprintf(buf, "constraint not defined\n"); 461 462 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 463} 464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 465 466static ssize_t regulator_max_uV_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468{ 469 struct regulator_dev *rdev = dev_get_drvdata(dev); 470 471 if (!rdev->constraints) 472 return sprintf(buf, "constraint not defined\n"); 473 474 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 475} 476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 477 478static ssize_t regulator_total_uA_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 struct regulator *regulator; 483 int uA = 0; 484 485 mutex_lock(&rdev->mutex); 486 list_for_each_entry(regulator, &rdev->consumer_list, list) 487 uA += regulator->uA_load; 488 mutex_unlock(&rdev->mutex); 489 return sprintf(buf, "%d\n", uA); 490} 491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 492 493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 494 char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 return sprintf(buf, "%d\n", rdev->use_count); 498} 499static DEVICE_ATTR_RO(num_users); 500 501static ssize_t type_show(struct device *dev, struct device_attribute *attr, 502 char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514static DEVICE_ATTR_RO(type); 515 516static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 522} 523static DEVICE_ATTR(suspend_mem_microvolts, 0444, 524 regulator_suspend_mem_uV_show, NULL); 525 526static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 532} 533static DEVICE_ATTR(suspend_disk_microvolts, 0444, 534 regulator_suspend_disk_uV_show, NULL); 535 536static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 struct regulator_dev *rdev = dev_get_drvdata(dev); 540 541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 542} 543static DEVICE_ATTR(suspend_standby_microvolts, 0444, 544 regulator_suspend_standby_uV_show, NULL); 545 546static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 547 struct device_attribute *attr, char *buf) 548{ 549 struct regulator_dev *rdev = dev_get_drvdata(dev); 550 551 return regulator_print_opmode(buf, 552 rdev->constraints->state_mem.mode); 553} 554static DEVICE_ATTR(suspend_mem_mode, 0444, 555 regulator_suspend_mem_mode_show, NULL); 556 557static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 558 struct device_attribute *attr, char *buf) 559{ 560 struct regulator_dev *rdev = dev_get_drvdata(dev); 561 562 return regulator_print_opmode(buf, 563 rdev->constraints->state_disk.mode); 564} 565static DEVICE_ATTR(suspend_disk_mode, 0444, 566 regulator_suspend_disk_mode_show, NULL); 567 568static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 569 struct device_attribute *attr, char *buf) 570{ 571 struct regulator_dev *rdev = dev_get_drvdata(dev); 572 573 return regulator_print_opmode(buf, 574 rdev->constraints->state_standby.mode); 575} 576static DEVICE_ATTR(suspend_standby_mode, 0444, 577 regulator_suspend_standby_mode_show, NULL); 578 579static ssize_t regulator_suspend_mem_state_show(struct device *dev, 580 struct device_attribute *attr, char *buf) 581{ 582 struct regulator_dev *rdev = dev_get_drvdata(dev); 583 584 return regulator_print_state(buf, 585 rdev->constraints->state_mem.enabled); 586} 587static DEVICE_ATTR(suspend_mem_state, 0444, 588 regulator_suspend_mem_state_show, NULL); 589 590static ssize_t regulator_suspend_disk_state_show(struct device *dev, 591 struct device_attribute *attr, char *buf) 592{ 593 struct regulator_dev *rdev = dev_get_drvdata(dev); 594 595 return regulator_print_state(buf, 596 rdev->constraints->state_disk.enabled); 597} 598static DEVICE_ATTR(suspend_disk_state, 0444, 599 regulator_suspend_disk_state_show, NULL); 600 601static ssize_t regulator_suspend_standby_state_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603{ 604 struct regulator_dev *rdev = dev_get_drvdata(dev); 605 606 return regulator_print_state(buf, 607 rdev->constraints->state_standby.enabled); 608} 609static DEVICE_ATTR(suspend_standby_state, 0444, 610 regulator_suspend_standby_state_show, NULL); 611 612static ssize_t regulator_bypass_show(struct device *dev, 613 struct device_attribute *attr, char *buf) 614{ 615 struct regulator_dev *rdev = dev_get_drvdata(dev); 616 const char *report; 617 bool bypass; 618 int ret; 619 620 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 621 622 if (ret != 0) 623 report = "unknown"; 624 else if (bypass) 625 report = "enabled"; 626 else 627 report = "disabled"; 628 629 return sprintf(buf, "%s\n", report); 630} 631static DEVICE_ATTR(bypass, 0444, 632 regulator_bypass_show, NULL); 633 634/* 635 * These are the only attributes are present for all regulators. 636 * Other attributes are a function of regulator functionality. 637 */ 638static struct attribute *regulator_dev_attrs[] = { 639 &dev_attr_name.attr, 640 &dev_attr_num_users.attr, 641 &dev_attr_type.attr, 642 NULL, 643}; 644ATTRIBUTE_GROUPS(regulator_dev); 645 646static void regulator_dev_release(struct device *dev) 647{ 648 struct regulator_dev *rdev = dev_get_drvdata(dev); 649 kfree(rdev); 650} 651 652static struct class regulator_class = { 653 .name = "regulator", 654 .dev_release = regulator_dev_release, 655 .dev_groups = regulator_dev_groups, 656}; 657 658/* Calculate the new optimum regulator operating mode based on the new total 659 * consumer load. All locks held by caller */ 660static void drms_uA_update(struct regulator_dev *rdev) 661{ 662 struct regulator *sibling; 663 int current_uA = 0, output_uV, input_uV, err; 664 unsigned int mode; 665 666 err = regulator_check_drms(rdev); 667 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 668 (!rdev->desc->ops->get_voltage && 669 !rdev->desc->ops->get_voltage_sel) || 670 !rdev->desc->ops->set_mode) 671 return; 672 673 /* get output voltage */ 674 output_uV = _regulator_get_voltage(rdev); 675 if (output_uV <= 0) 676 return; 677 678 /* get input voltage */ 679 input_uV = 0; 680 if (rdev->supply) 681 input_uV = regulator_get_voltage(rdev->supply); 682 if (input_uV <= 0) 683 input_uV = rdev->constraints->input_uV; 684 if (input_uV <= 0) 685 return; 686 687 /* calc total requested load */ 688 list_for_each_entry(sibling, &rdev->consumer_list, list) 689 current_uA += sibling->uA_load; 690 691 /* now get the optimum mode for our new total regulator load */ 692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 693 output_uV, current_uA); 694 695 /* check the new mode is allowed */ 696 err = regulator_mode_constrain(rdev, &mode); 697 if (err == 0) 698 rdev->desc->ops->set_mode(rdev, mode); 699} 700 701static int suspend_set_state(struct regulator_dev *rdev, 702 struct regulator_state *rstate) 703{ 704 int ret = 0; 705 706 /* If we have no suspend mode configration don't set anything; 707 * only warn if the driver implements set_suspend_voltage or 708 * set_suspend_mode callback. 709 */ 710 if (!rstate->enabled && !rstate->disabled) { 711 if (rdev->desc->ops->set_suspend_voltage || 712 rdev->desc->ops->set_suspend_mode) 713 rdev_warn(rdev, "No configuration\n"); 714 return 0; 715 } 716 717 if (rstate->enabled && rstate->disabled) { 718 rdev_err(rdev, "invalid configuration\n"); 719 return -EINVAL; 720 } 721 722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 723 ret = rdev->desc->ops->set_suspend_enable(rdev); 724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 725 ret = rdev->desc->ops->set_suspend_disable(rdev); 726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 727 ret = 0; 728 729 if (ret < 0) { 730 rdev_err(rdev, "failed to enabled/disable\n"); 731 return ret; 732 } 733 734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 736 if (ret < 0) { 737 rdev_err(rdev, "failed to set voltage\n"); 738 return ret; 739 } 740 } 741 742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 744 if (ret < 0) { 745 rdev_err(rdev, "failed to set mode\n"); 746 return ret; 747 } 748 } 749 return ret; 750} 751 752/* locks held by caller */ 753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 754{ 755 if (!rdev->constraints) 756 return -EINVAL; 757 758 switch (state) { 759 case PM_SUSPEND_STANDBY: 760 return suspend_set_state(rdev, 761 &rdev->constraints->state_standby); 762 case PM_SUSPEND_MEM: 763 return suspend_set_state(rdev, 764 &rdev->constraints->state_mem); 765 case PM_SUSPEND_MAX: 766 return suspend_set_state(rdev, 767 &rdev->constraints->state_disk); 768 default: 769 return -EINVAL; 770 } 771} 772 773static void print_constraints(struct regulator_dev *rdev) 774{ 775 struct regulation_constraints *constraints = rdev->constraints; 776 char buf[80] = ""; 777 int count = 0; 778 int ret; 779 780 if (constraints->min_uV && constraints->max_uV) { 781 if (constraints->min_uV == constraints->max_uV) 782 count += sprintf(buf + count, "%d mV ", 783 constraints->min_uV / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mV ", 786 constraints->min_uV / 1000, 787 constraints->max_uV / 1000); 788 } 789 790 if (!constraints->min_uV || 791 constraints->min_uV != constraints->max_uV) { 792 ret = _regulator_get_voltage(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mV ", ret / 1000); 795 } 796 797 if (constraints->uV_offset) 798 count += sprintf(buf, "%dmV offset ", 799 constraints->uV_offset / 1000); 800 801 if (constraints->min_uA && constraints->max_uA) { 802 if (constraints->min_uA == constraints->max_uA) 803 count += sprintf(buf + count, "%d mA ", 804 constraints->min_uA / 1000); 805 else 806 count += sprintf(buf + count, "%d <--> %d mA ", 807 constraints->min_uA / 1000, 808 constraints->max_uA / 1000); 809 } 810 811 if (!constraints->min_uA || 812 constraints->min_uA != constraints->max_uA) { 813 ret = _regulator_get_current_limit(rdev); 814 if (ret > 0) 815 count += sprintf(buf + count, "at %d mA ", ret / 1000); 816 } 817 818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 819 count += sprintf(buf + count, "fast "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 821 count += sprintf(buf + count, "normal "); 822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 823 count += sprintf(buf + count, "idle "); 824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 825 count += sprintf(buf + count, "standby"); 826 827 if (!count) 828 sprintf(buf, "no parameters"); 829 830 rdev_info(rdev, "%s\n", buf); 831 832 if ((constraints->min_uV != constraints->max_uV) && 833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 834 rdev_warn(rdev, 835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 836} 837 838static int machine_constraints_voltage(struct regulator_dev *rdev, 839 struct regulation_constraints *constraints) 840{ 841 struct regulator_ops *ops = rdev->desc->ops; 842 int ret; 843 844 /* do we need to apply the constraint voltage */ 845 if (rdev->constraints->apply_uV && 846 rdev->constraints->min_uV == rdev->constraints->max_uV) { 847 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 /* Don't log an error when called from regulator_get_optional() */ 1355 } else if (!have_full_constraints() || exclusive) { 1356 dev_err(dev, "dummy supplies not allowed\n"); 1357 } 1358 1359 mutex_unlock(®ulator_list_mutex); 1360 return regulator; 1361 1362found: 1363 if (rdev->exclusive) { 1364 regulator = ERR_PTR(-EPERM); 1365 goto out; 1366 } 1367 1368 if (exclusive && rdev->open_count) { 1369 regulator = ERR_PTR(-EBUSY); 1370 goto out; 1371 } 1372 1373 if (!try_module_get(rdev->owner)) 1374 goto out; 1375 1376 regulator = create_regulator(rdev, dev, id); 1377 if (regulator == NULL) { 1378 regulator = ERR_PTR(-ENOMEM); 1379 module_put(rdev->owner); 1380 goto out; 1381 } 1382 1383 rdev->open_count++; 1384 if (exclusive) { 1385 rdev->exclusive = 1; 1386 1387 ret = _regulator_is_enabled(rdev); 1388 if (ret > 0) 1389 rdev->use_count = 1; 1390 else 1391 rdev->use_count = 0; 1392 } 1393 1394out: 1395 mutex_unlock(®ulator_list_mutex); 1396 1397 return regulator; 1398} 1399 1400/** 1401 * regulator_get - lookup and obtain a reference to a regulator. 1402 * @dev: device for regulator "consumer" 1403 * @id: Supply name or regulator ID. 1404 * 1405 * Returns a struct regulator corresponding to the regulator producer, 1406 * or IS_ERR() condition containing errno. 1407 * 1408 * Use of supply names configured via regulator_set_device_supply() is 1409 * strongly encouraged. It is recommended that the supply name used 1410 * should match the name used for the supply and/or the relevant 1411 * device pins in the datasheet. 1412 */ 1413struct regulator *regulator_get(struct device *dev, const char *id) 1414{ 1415 return _regulator_get(dev, id, false, true); 1416} 1417EXPORT_SYMBOL_GPL(regulator_get); 1418 1419/** 1420 * regulator_get_exclusive - obtain exclusive access to a regulator. 1421 * @dev: device for regulator "consumer" 1422 * @id: Supply name or regulator ID. 1423 * 1424 * Returns a struct regulator corresponding to the regulator producer, 1425 * or IS_ERR() condition containing errno. Other consumers will be 1426 * unable to obtain this reference is held and the use count for the 1427 * regulator will be initialised to reflect the current state of the 1428 * regulator. 1429 * 1430 * This is intended for use by consumers which cannot tolerate shared 1431 * use of the regulator such as those which need to force the 1432 * regulator off for correct operation of the hardware they are 1433 * controlling. 1434 * 1435 * Use of supply names configured via regulator_set_device_supply() is 1436 * strongly encouraged. It is recommended that the supply name used 1437 * should match the name used for the supply and/or the relevant 1438 * device pins in the datasheet. 1439 */ 1440struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1441{ 1442 return _regulator_get(dev, id, true, false); 1443} 1444EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1445 1446/** 1447 * regulator_get_optional - obtain optional access to a regulator. 1448 * @dev: device for regulator "consumer" 1449 * @id: Supply name or regulator ID. 1450 * 1451 * Returns a struct regulator corresponding to the regulator producer, 1452 * or IS_ERR() condition containing errno. Other consumers will be 1453 * unable to obtain this reference is held and the use count for the 1454 * regulator will be initialised to reflect the current state of the 1455 * regulator. 1456 * 1457 * This is intended for use by consumers for devices which can have 1458 * some supplies unconnected in normal use, such as some MMC devices. 1459 * It can allow the regulator core to provide stub supplies for other 1460 * supplies requested using normal regulator_get() calls without 1461 * disrupting the operation of drivers that can handle absent 1462 * supplies. 1463 * 1464 * Use of supply names configured via regulator_set_device_supply() is 1465 * strongly encouraged. It is recommended that the supply name used 1466 * should match the name used for the supply and/or the relevant 1467 * device pins in the datasheet. 1468 */ 1469struct regulator *regulator_get_optional(struct device *dev, const char *id) 1470{ 1471 return _regulator_get(dev, id, false, false); 1472} 1473EXPORT_SYMBOL_GPL(regulator_get_optional); 1474 1475/* Locks held by regulator_put() */ 1476static void _regulator_put(struct regulator *regulator) 1477{ 1478 struct regulator_dev *rdev; 1479 1480 if (regulator == NULL || IS_ERR(regulator)) 1481 return; 1482 1483 rdev = regulator->rdev; 1484 1485 debugfs_remove_recursive(regulator->debugfs); 1486 1487 /* remove any sysfs entries */ 1488 if (regulator->dev) 1489 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1490 kfree(regulator->supply_name); 1491 list_del(®ulator->list); 1492 kfree(regulator); 1493 1494 rdev->open_count--; 1495 rdev->exclusive = 0; 1496 1497 module_put(rdev->owner); 1498} 1499 1500/** 1501 * regulator_put - "free" the regulator source 1502 * @regulator: regulator source 1503 * 1504 * Note: drivers must ensure that all regulator_enable calls made on this 1505 * regulator source are balanced by regulator_disable calls prior to calling 1506 * this function. 1507 */ 1508void regulator_put(struct regulator *regulator) 1509{ 1510 mutex_lock(®ulator_list_mutex); 1511 _regulator_put(regulator); 1512 mutex_unlock(®ulator_list_mutex); 1513} 1514EXPORT_SYMBOL_GPL(regulator_put); 1515 1516/** 1517 * regulator_register_supply_alias - Provide device alias for supply lookup 1518 * 1519 * @dev: device that will be given as the regulator "consumer" 1520 * @id: Supply name or regulator ID 1521 * @alias_dev: device that should be used to lookup the supply 1522 * @alias_id: Supply name or regulator ID that should be used to lookup the 1523 * supply 1524 * 1525 * All lookups for id on dev will instead be conducted for alias_id on 1526 * alias_dev. 1527 */ 1528int regulator_register_supply_alias(struct device *dev, const char *id, 1529 struct device *alias_dev, 1530 const char *alias_id) 1531{ 1532 struct regulator_supply_alias *map; 1533 1534 map = regulator_find_supply_alias(dev, id); 1535 if (map) 1536 return -EEXIST; 1537 1538 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1539 if (!map) 1540 return -ENOMEM; 1541 1542 map->src_dev = dev; 1543 map->src_supply = id; 1544 map->alias_dev = alias_dev; 1545 map->alias_supply = alias_id; 1546 1547 list_add(&map->list, ®ulator_supply_alias_list); 1548 1549 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1550 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1551 1552 return 0; 1553} 1554EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1555 1556/** 1557 * regulator_unregister_supply_alias - Remove device alias 1558 * 1559 * @dev: device that will be given as the regulator "consumer" 1560 * @id: Supply name or regulator ID 1561 * 1562 * Remove a lookup alias if one exists for id on dev. 1563 */ 1564void regulator_unregister_supply_alias(struct device *dev, const char *id) 1565{ 1566 struct regulator_supply_alias *map; 1567 1568 map = regulator_find_supply_alias(dev, id); 1569 if (map) { 1570 list_del(&map->list); 1571 kfree(map); 1572 } 1573} 1574EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1575 1576/** 1577 * regulator_bulk_register_supply_alias - register multiple aliases 1578 * 1579 * @dev: device that will be given as the regulator "consumer" 1580 * @id: List of supply names or regulator IDs 1581 * @alias_dev: device that should be used to lookup the supply 1582 * @alias_id: List of supply names or regulator IDs that should be used to 1583 * lookup the supply 1584 * @num_id: Number of aliases to register 1585 * 1586 * @return 0 on success, an errno on failure. 1587 * 1588 * This helper function allows drivers to register several supply 1589 * aliases in one operation. If any of the aliases cannot be 1590 * registered any aliases that were registered will be removed 1591 * before returning to the caller. 1592 */ 1593int regulator_bulk_register_supply_alias(struct device *dev, const char **id, 1594 struct device *alias_dev, 1595 const char **alias_id, 1596 int num_id) 1597{ 1598 int i; 1599 int ret; 1600 1601 for (i = 0; i < num_id; ++i) { 1602 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1603 alias_id[i]); 1604 if (ret < 0) 1605 goto err; 1606 } 1607 1608 return 0; 1609 1610err: 1611 dev_err(dev, 1612 "Failed to create supply alias %s,%s -> %s,%s\n", 1613 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1614 1615 while (--i >= 0) 1616 regulator_unregister_supply_alias(dev, id[i]); 1617 1618 return ret; 1619} 1620EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1621 1622/** 1623 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1624 * 1625 * @dev: device that will be given as the regulator "consumer" 1626 * @id: List of supply names or regulator IDs 1627 * @num_id: Number of aliases to unregister 1628 * 1629 * This helper function allows drivers to unregister several supply 1630 * aliases in one operation. 1631 */ 1632void regulator_bulk_unregister_supply_alias(struct device *dev, 1633 const char **id, 1634 int num_id) 1635{ 1636 int i; 1637 1638 for (i = 0; i < num_id; ++i) 1639 regulator_unregister_supply_alias(dev, id[i]); 1640} 1641EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1642 1643 1644/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1645static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1646 const struct regulator_config *config) 1647{ 1648 struct regulator_enable_gpio *pin; 1649 int ret; 1650 1651 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1652 if (pin->gpio == config->ena_gpio) { 1653 rdev_dbg(rdev, "GPIO %d is already used\n", 1654 config->ena_gpio); 1655 goto update_ena_gpio_to_rdev; 1656 } 1657 } 1658 1659 ret = gpio_request_one(config->ena_gpio, 1660 GPIOF_DIR_OUT | config->ena_gpio_flags, 1661 rdev_get_name(rdev)); 1662 if (ret) 1663 return ret; 1664 1665 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1666 if (pin == NULL) { 1667 gpio_free(config->ena_gpio); 1668 return -ENOMEM; 1669 } 1670 1671 pin->gpio = config->ena_gpio; 1672 pin->ena_gpio_invert = config->ena_gpio_invert; 1673 list_add(&pin->list, ®ulator_ena_gpio_list); 1674 1675update_ena_gpio_to_rdev: 1676 pin->request_count++; 1677 rdev->ena_pin = pin; 1678 return 0; 1679} 1680 1681static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1682{ 1683 struct regulator_enable_gpio *pin, *n; 1684 1685 if (!rdev->ena_pin) 1686 return; 1687 1688 /* Free the GPIO only in case of no use */ 1689 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1690 if (pin->gpio == rdev->ena_pin->gpio) { 1691 if (pin->request_count <= 1) { 1692 pin->request_count = 0; 1693 gpio_free(pin->gpio); 1694 list_del(&pin->list); 1695 kfree(pin); 1696 } else { 1697 pin->request_count--; 1698 } 1699 } 1700 } 1701} 1702 1703/** 1704 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1705 * @rdev: regulator_dev structure 1706 * @enable: enable GPIO at initial use? 1707 * 1708 * GPIO is enabled in case of initial use. (enable_count is 0) 1709 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1710 */ 1711static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1712{ 1713 struct regulator_enable_gpio *pin = rdev->ena_pin; 1714 1715 if (!pin) 1716 return -EINVAL; 1717 1718 if (enable) { 1719 /* Enable GPIO at initial use */ 1720 if (pin->enable_count == 0) 1721 gpio_set_value_cansleep(pin->gpio, 1722 !pin->ena_gpio_invert); 1723 1724 pin->enable_count++; 1725 } else { 1726 if (pin->enable_count > 1) { 1727 pin->enable_count--; 1728 return 0; 1729 } 1730 1731 /* Disable GPIO if not used */ 1732 if (pin->enable_count <= 1) { 1733 gpio_set_value_cansleep(pin->gpio, 1734 pin->ena_gpio_invert); 1735 pin->enable_count = 0; 1736 } 1737 } 1738 1739 return 0; 1740} 1741 1742static int _regulator_do_enable(struct regulator_dev *rdev) 1743{ 1744 int ret, delay; 1745 1746 /* Query before enabling in case configuration dependent. */ 1747 ret = _regulator_get_enable_time(rdev); 1748 if (ret >= 0) { 1749 delay = ret; 1750 } else { 1751 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1752 delay = 0; 1753 } 1754 1755 trace_regulator_enable(rdev_get_name(rdev)); 1756 1757 if (rdev->ena_pin) { 1758 ret = regulator_ena_gpio_ctrl(rdev, true); 1759 if (ret < 0) 1760 return ret; 1761 rdev->ena_gpio_state = 1; 1762 } else if (rdev->desc->ops->enable) { 1763 ret = rdev->desc->ops->enable(rdev); 1764 if (ret < 0) 1765 return ret; 1766 } else { 1767 return -EINVAL; 1768 } 1769 1770 /* Allow the regulator to ramp; it would be useful to extend 1771 * this for bulk operations so that the regulators can ramp 1772 * together. */ 1773 trace_regulator_enable_delay(rdev_get_name(rdev)); 1774 1775 /* 1776 * Delay for the requested amount of time as per the guidelines in: 1777 * 1778 * Documentation/timers/timers-howto.txt 1779 * 1780 * The assumption here is that regulators will never be enabled in 1781 * atomic context and therefore sleeping functions can be used. 1782 */ 1783 if (delay) { 1784 unsigned int ms = delay / 1000; 1785 unsigned int us = delay % 1000; 1786 1787 if (ms > 0) { 1788 /* 1789 * For small enough values, handle super-millisecond 1790 * delays in the usleep_range() call below. 1791 */ 1792 if (ms < 20) 1793 us += ms * 1000; 1794 else 1795 msleep(ms); 1796 } 1797 1798 /* 1799 * Give the scheduler some room to coalesce with any other 1800 * wakeup sources. For delays shorter than 10 us, don't even 1801 * bother setting up high-resolution timers and just busy- 1802 * loop. 1803 */ 1804 if (us >= 10) 1805 usleep_range(us, us + 100); 1806 else 1807 udelay(us); 1808 } 1809 1810 trace_regulator_enable_complete(rdev_get_name(rdev)); 1811 1812 return 0; 1813} 1814 1815/* locks held by regulator_enable() */ 1816static int _regulator_enable(struct regulator_dev *rdev) 1817{ 1818 int ret; 1819 1820 /* check voltage and requested load before enabling */ 1821 if (rdev->constraints && 1822 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1823 drms_uA_update(rdev); 1824 1825 if (rdev->use_count == 0) { 1826 /* The regulator may on if it's not switchable or left on */ 1827 ret = _regulator_is_enabled(rdev); 1828 if (ret == -EINVAL || ret == 0) { 1829 if (!_regulator_can_change_status(rdev)) 1830 return -EPERM; 1831 1832 ret = _regulator_do_enable(rdev); 1833 if (ret < 0) 1834 return ret; 1835 1836 } else if (ret < 0) { 1837 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1838 return ret; 1839 } 1840 /* Fallthrough on positive return values - already enabled */ 1841 } 1842 1843 rdev->use_count++; 1844 1845 return 0; 1846} 1847 1848/** 1849 * regulator_enable - enable regulator output 1850 * @regulator: regulator source 1851 * 1852 * Request that the regulator be enabled with the regulator output at 1853 * the predefined voltage or current value. Calls to regulator_enable() 1854 * must be balanced with calls to regulator_disable(). 1855 * 1856 * NOTE: the output value can be set by other drivers, boot loader or may be 1857 * hardwired in the regulator. 1858 */ 1859int regulator_enable(struct regulator *regulator) 1860{ 1861 struct regulator_dev *rdev = regulator->rdev; 1862 int ret = 0; 1863 1864 if (regulator->always_on) 1865 return 0; 1866 1867 if (rdev->supply) { 1868 ret = regulator_enable(rdev->supply); 1869 if (ret != 0) 1870 return ret; 1871 } 1872 1873 mutex_lock(&rdev->mutex); 1874 ret = _regulator_enable(rdev); 1875 mutex_unlock(&rdev->mutex); 1876 1877 if (ret != 0 && rdev->supply) 1878 regulator_disable(rdev->supply); 1879 1880 return ret; 1881} 1882EXPORT_SYMBOL_GPL(regulator_enable); 1883 1884static int _regulator_do_disable(struct regulator_dev *rdev) 1885{ 1886 int ret; 1887 1888 trace_regulator_disable(rdev_get_name(rdev)); 1889 1890 if (rdev->ena_pin) { 1891 ret = regulator_ena_gpio_ctrl(rdev, false); 1892 if (ret < 0) 1893 return ret; 1894 rdev->ena_gpio_state = 0; 1895 1896 } else if (rdev->desc->ops->disable) { 1897 ret = rdev->desc->ops->disable(rdev); 1898 if (ret != 0) 1899 return ret; 1900 } 1901 1902 trace_regulator_disable_complete(rdev_get_name(rdev)); 1903 1904 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1905 NULL); 1906 return 0; 1907} 1908 1909/* locks held by regulator_disable() */ 1910static int _regulator_disable(struct regulator_dev *rdev) 1911{ 1912 int ret = 0; 1913 1914 if (WARN(rdev->use_count <= 0, 1915 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1916 return -EIO; 1917 1918 /* are we the last user and permitted to disable ? */ 1919 if (rdev->use_count == 1 && 1920 (rdev->constraints && !rdev->constraints->always_on)) { 1921 1922 /* we are last user */ 1923 if (_regulator_can_change_status(rdev)) { 1924 ret = _regulator_do_disable(rdev); 1925 if (ret < 0) { 1926 rdev_err(rdev, "failed to disable\n"); 1927 return ret; 1928 } 1929 } 1930 1931 rdev->use_count = 0; 1932 } else if (rdev->use_count > 1) { 1933 1934 if (rdev->constraints && 1935 (rdev->constraints->valid_ops_mask & 1936 REGULATOR_CHANGE_DRMS)) 1937 drms_uA_update(rdev); 1938 1939 rdev->use_count--; 1940 } 1941 1942 return ret; 1943} 1944 1945/** 1946 * regulator_disable - disable regulator output 1947 * @regulator: regulator source 1948 * 1949 * Disable the regulator output voltage or current. Calls to 1950 * regulator_enable() must be balanced with calls to 1951 * regulator_disable(). 1952 * 1953 * NOTE: this will only disable the regulator output if no other consumer 1954 * devices have it enabled, the regulator device supports disabling and 1955 * machine constraints permit this operation. 1956 */ 1957int regulator_disable(struct regulator *regulator) 1958{ 1959 struct regulator_dev *rdev = regulator->rdev; 1960 int ret = 0; 1961 1962 if (regulator->always_on) 1963 return 0; 1964 1965 mutex_lock(&rdev->mutex); 1966 ret = _regulator_disable(rdev); 1967 mutex_unlock(&rdev->mutex); 1968 1969 if (ret == 0 && rdev->supply) 1970 regulator_disable(rdev->supply); 1971 1972 return ret; 1973} 1974EXPORT_SYMBOL_GPL(regulator_disable); 1975 1976/* locks held by regulator_force_disable() */ 1977static int _regulator_force_disable(struct regulator_dev *rdev) 1978{ 1979 int ret = 0; 1980 1981 /* force disable */ 1982 if (rdev->desc->ops->disable) { 1983 /* ah well, who wants to live forever... */ 1984 ret = rdev->desc->ops->disable(rdev); 1985 if (ret < 0) { 1986 rdev_err(rdev, "failed to force disable\n"); 1987 return ret; 1988 } 1989 /* notify other consumers that power has been forced off */ 1990 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1991 REGULATOR_EVENT_DISABLE, NULL); 1992 } 1993 1994 return ret; 1995} 1996 1997/** 1998 * regulator_force_disable - force disable regulator output 1999 * @regulator: regulator source 2000 * 2001 * Forcibly disable the regulator output voltage or current. 2002 * NOTE: this *will* disable the regulator output even if other consumer 2003 * devices have it enabled. This should be used for situations when device 2004 * damage will likely occur if the regulator is not disabled (e.g. over temp). 2005 */ 2006int regulator_force_disable(struct regulator *regulator) 2007{ 2008 struct regulator_dev *rdev = regulator->rdev; 2009 int ret; 2010 2011 mutex_lock(&rdev->mutex); 2012 regulator->uA_load = 0; 2013 ret = _regulator_force_disable(regulator->rdev); 2014 mutex_unlock(&rdev->mutex); 2015 2016 if (rdev->supply) 2017 while (rdev->open_count--) 2018 regulator_disable(rdev->supply); 2019 2020 return ret; 2021} 2022EXPORT_SYMBOL_GPL(regulator_force_disable); 2023 2024static void regulator_disable_work(struct work_struct *work) 2025{ 2026 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 2027 disable_work.work); 2028 int count, i, ret; 2029 2030 mutex_lock(&rdev->mutex); 2031 2032 BUG_ON(!rdev->deferred_disables); 2033 2034 count = rdev->deferred_disables; 2035 rdev->deferred_disables = 0; 2036 2037 for (i = 0; i < count; i++) { 2038 ret = _regulator_disable(rdev); 2039 if (ret != 0) 2040 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 2041 } 2042 2043 mutex_unlock(&rdev->mutex); 2044 2045 if (rdev->supply) { 2046 for (i = 0; i < count; i++) { 2047 ret = regulator_disable(rdev->supply); 2048 if (ret != 0) { 2049 rdev_err(rdev, 2050 "Supply disable failed: %d\n", ret); 2051 } 2052 } 2053 } 2054} 2055 2056/** 2057 * regulator_disable_deferred - disable regulator output with delay 2058 * @regulator: regulator source 2059 * @ms: miliseconds until the regulator is disabled 2060 * 2061 * Execute regulator_disable() on the regulator after a delay. This 2062 * is intended for use with devices that require some time to quiesce. 2063 * 2064 * NOTE: this will only disable the regulator output if no other consumer 2065 * devices have it enabled, the regulator device supports disabling and 2066 * machine constraints permit this operation. 2067 */ 2068int regulator_disable_deferred(struct regulator *regulator, int ms) 2069{ 2070 struct regulator_dev *rdev = regulator->rdev; 2071 int ret; 2072 2073 if (regulator->always_on) 2074 return 0; 2075 2076 if (!ms) 2077 return regulator_disable(regulator); 2078 2079 mutex_lock(&rdev->mutex); 2080 rdev->deferred_disables++; 2081 mutex_unlock(&rdev->mutex); 2082 2083 ret = queue_delayed_work(system_power_efficient_wq, 2084 &rdev->disable_work, 2085 msecs_to_jiffies(ms)); 2086 if (ret < 0) 2087 return ret; 2088 else 2089 return 0; 2090} 2091EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2092 2093static int _regulator_is_enabled(struct regulator_dev *rdev) 2094{ 2095 /* A GPIO control always takes precedence */ 2096 if (rdev->ena_pin) 2097 return rdev->ena_gpio_state; 2098 2099 /* If we don't know then assume that the regulator is always on */ 2100 if (!rdev->desc->ops->is_enabled) 2101 return 1; 2102 2103 return rdev->desc->ops->is_enabled(rdev); 2104} 2105 2106/** 2107 * regulator_is_enabled - is the regulator output enabled 2108 * @regulator: regulator source 2109 * 2110 * Returns positive if the regulator driver backing the source/client 2111 * has requested that the device be enabled, zero if it hasn't, else a 2112 * negative errno code. 2113 * 2114 * Note that the device backing this regulator handle can have multiple 2115 * users, so it might be enabled even if regulator_enable() was never 2116 * called for this particular source. 2117 */ 2118int regulator_is_enabled(struct regulator *regulator) 2119{ 2120 int ret; 2121 2122 if (regulator->always_on) 2123 return 1; 2124 2125 mutex_lock(®ulator->rdev->mutex); 2126 ret = _regulator_is_enabled(regulator->rdev); 2127 mutex_unlock(®ulator->rdev->mutex); 2128 2129 return ret; 2130} 2131EXPORT_SYMBOL_GPL(regulator_is_enabled); 2132 2133/** 2134 * regulator_can_change_voltage - check if regulator can change voltage 2135 * @regulator: regulator source 2136 * 2137 * Returns positive if the regulator driver backing the source/client 2138 * can change its voltage, false otherwise. Usefull for detecting fixed 2139 * or dummy regulators and disabling voltage change logic in the client 2140 * driver. 2141 */ 2142int regulator_can_change_voltage(struct regulator *regulator) 2143{ 2144 struct regulator_dev *rdev = regulator->rdev; 2145 2146 if (rdev->constraints && 2147 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2148 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2149 return 1; 2150 2151 if (rdev->desc->continuous_voltage_range && 2152 rdev->constraints->min_uV && rdev->constraints->max_uV && 2153 rdev->constraints->min_uV != rdev->constraints->max_uV) 2154 return 1; 2155 } 2156 2157 return 0; 2158} 2159EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2160 2161/** 2162 * regulator_count_voltages - count regulator_list_voltage() selectors 2163 * @regulator: regulator source 2164 * 2165 * Returns number of selectors, or negative errno. Selectors are 2166 * numbered starting at zero, and typically correspond to bitfields 2167 * in hardware registers. 2168 */ 2169int regulator_count_voltages(struct regulator *regulator) 2170{ 2171 struct regulator_dev *rdev = regulator->rdev; 2172 2173 return rdev->desc->n_voltages ? : -EINVAL; 2174} 2175EXPORT_SYMBOL_GPL(regulator_count_voltages); 2176 2177/** 2178 * regulator_list_voltage - enumerate supported voltages 2179 * @regulator: regulator source 2180 * @selector: identify voltage to list 2181 * Context: can sleep 2182 * 2183 * Returns a voltage that can be passed to @regulator_set_voltage(), 2184 * zero if this selector code can't be used on this system, or a 2185 * negative errno. 2186 */ 2187int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2188{ 2189 struct regulator_dev *rdev = regulator->rdev; 2190 struct regulator_ops *ops = rdev->desc->ops; 2191 int ret; 2192 2193 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) 2194 return rdev->desc->fixed_uV; 2195 2196 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2197 return -EINVAL; 2198 2199 mutex_lock(&rdev->mutex); 2200 ret = ops->list_voltage(rdev, selector); 2201 mutex_unlock(&rdev->mutex); 2202 2203 if (ret > 0) { 2204 if (ret < rdev->constraints->min_uV) 2205 ret = 0; 2206 else if (ret > rdev->constraints->max_uV) 2207 ret = 0; 2208 } 2209 2210 return ret; 2211} 2212EXPORT_SYMBOL_GPL(regulator_list_voltage); 2213 2214/** 2215 * regulator_get_linear_step - return the voltage step size between VSEL values 2216 * @regulator: regulator source 2217 * 2218 * Returns the voltage step size between VSEL values for linear 2219 * regulators, or return 0 if the regulator isn't a linear regulator. 2220 */ 2221unsigned int regulator_get_linear_step(struct regulator *regulator) 2222{ 2223 struct regulator_dev *rdev = regulator->rdev; 2224 2225 return rdev->desc->uV_step; 2226} 2227EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2228 2229/** 2230 * regulator_is_supported_voltage - check if a voltage range can be supported 2231 * 2232 * @regulator: Regulator to check. 2233 * @min_uV: Minimum required voltage in uV. 2234 * @max_uV: Maximum required voltage in uV. 2235 * 2236 * Returns a boolean or a negative error code. 2237 */ 2238int regulator_is_supported_voltage(struct regulator *regulator, 2239 int min_uV, int max_uV) 2240{ 2241 struct regulator_dev *rdev = regulator->rdev; 2242 int i, voltages, ret; 2243 2244 /* If we can't change voltage check the current voltage */ 2245 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2246 ret = regulator_get_voltage(regulator); 2247 if (ret >= 0) 2248 return (min_uV <= ret && ret <= max_uV); 2249 else 2250 return ret; 2251 } 2252 2253 /* Any voltage within constrains range is fine? */ 2254 if (rdev->desc->continuous_voltage_range) 2255 return min_uV >= rdev->constraints->min_uV && 2256 max_uV <= rdev->constraints->max_uV; 2257 2258 ret = regulator_count_voltages(regulator); 2259 if (ret < 0) 2260 return ret; 2261 voltages = ret; 2262 2263 for (i = 0; i < voltages; i++) { 2264 ret = regulator_list_voltage(regulator, i); 2265 2266 if (ret >= min_uV && ret <= max_uV) 2267 return 1; 2268 } 2269 2270 return 0; 2271} 2272EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2273 2274static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2275 int min_uV, int max_uV) 2276{ 2277 int ret; 2278 int delay = 0; 2279 int best_val = 0; 2280 unsigned int selector; 2281 int old_selector = -1; 2282 2283 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2284 2285 min_uV += rdev->constraints->uV_offset; 2286 max_uV += rdev->constraints->uV_offset; 2287 2288 /* 2289 * If we can't obtain the old selector there is not enough 2290 * info to call set_voltage_time_sel(). 2291 */ 2292 if (_regulator_is_enabled(rdev) && 2293 rdev->desc->ops->set_voltage_time_sel && 2294 rdev->desc->ops->get_voltage_sel) { 2295 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2296 if (old_selector < 0) 2297 return old_selector; 2298 } 2299 2300 if (rdev->desc->ops->set_voltage) { 2301 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2302 &selector); 2303 2304 if (ret >= 0) { 2305 if (rdev->desc->ops->list_voltage) 2306 best_val = rdev->desc->ops->list_voltage(rdev, 2307 selector); 2308 else 2309 best_val = _regulator_get_voltage(rdev); 2310 } 2311 2312 } else if (rdev->desc->ops->set_voltage_sel) { 2313 if (rdev->desc->ops->map_voltage) { 2314 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2315 max_uV); 2316 } else { 2317 if (rdev->desc->ops->list_voltage == 2318 regulator_list_voltage_linear) 2319 ret = regulator_map_voltage_linear(rdev, 2320 min_uV, max_uV); 2321 else 2322 ret = regulator_map_voltage_iterate(rdev, 2323 min_uV, max_uV); 2324 } 2325 2326 if (ret >= 0) { 2327 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2328 if (min_uV <= best_val && max_uV >= best_val) { 2329 selector = ret; 2330 if (old_selector == selector) 2331 ret = 0; 2332 else 2333 ret = rdev->desc->ops->set_voltage_sel( 2334 rdev, ret); 2335 } else { 2336 ret = -EINVAL; 2337 } 2338 } 2339 } else { 2340 ret = -EINVAL; 2341 } 2342 2343 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2344 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2345 && old_selector != selector) { 2346 2347 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2348 old_selector, selector); 2349 if (delay < 0) { 2350 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2351 delay); 2352 delay = 0; 2353 } 2354 2355 /* Insert any necessary delays */ 2356 if (delay >= 1000) { 2357 mdelay(delay / 1000); 2358 udelay(delay % 1000); 2359 } else if (delay) { 2360 udelay(delay); 2361 } 2362 } 2363 2364 if (ret == 0 && best_val >= 0) { 2365 unsigned long data = best_val; 2366 2367 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2368 (void *)data); 2369 } 2370 2371 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2372 2373 return ret; 2374} 2375 2376/** 2377 * regulator_set_voltage - set regulator output voltage 2378 * @regulator: regulator source 2379 * @min_uV: Minimum required voltage in uV 2380 * @max_uV: Maximum acceptable voltage in uV 2381 * 2382 * Sets a voltage regulator to the desired output voltage. This can be set 2383 * during any regulator state. IOW, regulator can be disabled or enabled. 2384 * 2385 * If the regulator is enabled then the voltage will change to the new value 2386 * immediately otherwise if the regulator is disabled the regulator will 2387 * output at the new voltage when enabled. 2388 * 2389 * NOTE: If the regulator is shared between several devices then the lowest 2390 * request voltage that meets the system constraints will be used. 2391 * Regulator system constraints must be set for this regulator before 2392 * calling this function otherwise this call will fail. 2393 */ 2394int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2395{ 2396 struct regulator_dev *rdev = regulator->rdev; 2397 int ret = 0; 2398 int old_min_uV, old_max_uV; 2399 2400 mutex_lock(&rdev->mutex); 2401 2402 /* If we're setting the same range as last time the change 2403 * should be a noop (some cpufreq implementations use the same 2404 * voltage for multiple frequencies, for example). 2405 */ 2406 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2407 goto out; 2408 2409 /* sanity check */ 2410 if (!rdev->desc->ops->set_voltage && 2411 !rdev->desc->ops->set_voltage_sel) { 2412 ret = -EINVAL; 2413 goto out; 2414 } 2415 2416 /* constraints check */ 2417 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2418 if (ret < 0) 2419 goto out; 2420 2421 /* restore original values in case of error */ 2422 old_min_uV = regulator->min_uV; 2423 old_max_uV = regulator->max_uV; 2424 regulator->min_uV = min_uV; 2425 regulator->max_uV = max_uV; 2426 2427 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2428 if (ret < 0) 2429 goto out2; 2430 2431 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2432 if (ret < 0) 2433 goto out2; 2434 2435out: 2436 mutex_unlock(&rdev->mutex); 2437 return ret; 2438out2: 2439 regulator->min_uV = old_min_uV; 2440 regulator->max_uV = old_max_uV; 2441 mutex_unlock(&rdev->mutex); 2442 return ret; 2443} 2444EXPORT_SYMBOL_GPL(regulator_set_voltage); 2445 2446/** 2447 * regulator_set_voltage_time - get raise/fall time 2448 * @regulator: regulator source 2449 * @old_uV: starting voltage in microvolts 2450 * @new_uV: target voltage in microvolts 2451 * 2452 * Provided with the starting and ending voltage, this function attempts to 2453 * calculate the time in microseconds required to rise or fall to this new 2454 * voltage. 2455 */ 2456int regulator_set_voltage_time(struct regulator *regulator, 2457 int old_uV, int new_uV) 2458{ 2459 struct regulator_dev *rdev = regulator->rdev; 2460 struct regulator_ops *ops = rdev->desc->ops; 2461 int old_sel = -1; 2462 int new_sel = -1; 2463 int voltage; 2464 int i; 2465 2466 /* Currently requires operations to do this */ 2467 if (!ops->list_voltage || !ops->set_voltage_time_sel 2468 || !rdev->desc->n_voltages) 2469 return -EINVAL; 2470 2471 for (i = 0; i < rdev->desc->n_voltages; i++) { 2472 /* We only look for exact voltage matches here */ 2473 voltage = regulator_list_voltage(regulator, i); 2474 if (voltage < 0) 2475 return -EINVAL; 2476 if (voltage == 0) 2477 continue; 2478 if (voltage == old_uV) 2479 old_sel = i; 2480 if (voltage == new_uV) 2481 new_sel = i; 2482 } 2483 2484 if (old_sel < 0 || new_sel < 0) 2485 return -EINVAL; 2486 2487 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2488} 2489EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2490 2491/** 2492 * regulator_set_voltage_time_sel - get raise/fall time 2493 * @rdev: regulator source device 2494 * @old_selector: selector for starting voltage 2495 * @new_selector: selector for target voltage 2496 * 2497 * Provided with the starting and target voltage selectors, this function 2498 * returns time in microseconds required to rise or fall to this new voltage 2499 * 2500 * Drivers providing ramp_delay in regulation_constraints can use this as their 2501 * set_voltage_time_sel() operation. 2502 */ 2503int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2504 unsigned int old_selector, 2505 unsigned int new_selector) 2506{ 2507 unsigned int ramp_delay = 0; 2508 int old_volt, new_volt; 2509 2510 if (rdev->constraints->ramp_delay) 2511 ramp_delay = rdev->constraints->ramp_delay; 2512 else if (rdev->desc->ramp_delay) 2513 ramp_delay = rdev->desc->ramp_delay; 2514 2515 if (ramp_delay == 0) { 2516 rdev_warn(rdev, "ramp_delay not set\n"); 2517 return 0; 2518 } 2519 2520 /* sanity check */ 2521 if (!rdev->desc->ops->list_voltage) 2522 return -EINVAL; 2523 2524 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2525 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2526 2527 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2528} 2529EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2530 2531/** 2532 * regulator_sync_voltage - re-apply last regulator output voltage 2533 * @regulator: regulator source 2534 * 2535 * Re-apply the last configured voltage. This is intended to be used 2536 * where some external control source the consumer is cooperating with 2537 * has caused the configured voltage to change. 2538 */ 2539int regulator_sync_voltage(struct regulator *regulator) 2540{ 2541 struct regulator_dev *rdev = regulator->rdev; 2542 int ret, min_uV, max_uV; 2543 2544 mutex_lock(&rdev->mutex); 2545 2546 if (!rdev->desc->ops->set_voltage && 2547 !rdev->desc->ops->set_voltage_sel) { 2548 ret = -EINVAL; 2549 goto out; 2550 } 2551 2552 /* This is only going to work if we've had a voltage configured. */ 2553 if (!regulator->min_uV && !regulator->max_uV) { 2554 ret = -EINVAL; 2555 goto out; 2556 } 2557 2558 min_uV = regulator->min_uV; 2559 max_uV = regulator->max_uV; 2560 2561 /* This should be a paranoia check... */ 2562 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2563 if (ret < 0) 2564 goto out; 2565 2566 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2567 if (ret < 0) 2568 goto out; 2569 2570 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2571 2572out: 2573 mutex_unlock(&rdev->mutex); 2574 return ret; 2575} 2576EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2577 2578static int _regulator_get_voltage(struct regulator_dev *rdev) 2579{ 2580 int sel, ret; 2581 2582 if (rdev->desc->ops->get_voltage_sel) { 2583 sel = rdev->desc->ops->get_voltage_sel(rdev); 2584 if (sel < 0) 2585 return sel; 2586 ret = rdev->desc->ops->list_voltage(rdev, sel); 2587 } else if (rdev->desc->ops->get_voltage) { 2588 ret = rdev->desc->ops->get_voltage(rdev); 2589 } else if (rdev->desc->ops->list_voltage) { 2590 ret = rdev->desc->ops->list_voltage(rdev, 0); 2591 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { 2592 ret = rdev->desc->fixed_uV; 2593 } else { 2594 return -EINVAL; 2595 } 2596 2597 if (ret < 0) 2598 return ret; 2599 return ret - rdev->constraints->uV_offset; 2600} 2601 2602/** 2603 * regulator_get_voltage - get regulator output voltage 2604 * @regulator: regulator source 2605 * 2606 * This returns the current regulator voltage in uV. 2607 * 2608 * NOTE: If the regulator is disabled it will return the voltage value. This 2609 * function should not be used to determine regulator state. 2610 */ 2611int regulator_get_voltage(struct regulator *regulator) 2612{ 2613 int ret; 2614 2615 mutex_lock(®ulator->rdev->mutex); 2616 2617 ret = _regulator_get_voltage(regulator->rdev); 2618 2619 mutex_unlock(®ulator->rdev->mutex); 2620 2621 return ret; 2622} 2623EXPORT_SYMBOL_GPL(regulator_get_voltage); 2624 2625/** 2626 * regulator_set_current_limit - set regulator output current limit 2627 * @regulator: regulator source 2628 * @min_uA: Minimum supported current in uA 2629 * @max_uA: Maximum supported current in uA 2630 * 2631 * Sets current sink to the desired output current. This can be set during 2632 * any regulator state. IOW, regulator can be disabled or enabled. 2633 * 2634 * If the regulator is enabled then the current will change to the new value 2635 * immediately otherwise if the regulator is disabled the regulator will 2636 * output at the new current when enabled. 2637 * 2638 * NOTE: Regulator system constraints must be set for this regulator before 2639 * calling this function otherwise this call will fail. 2640 */ 2641int regulator_set_current_limit(struct regulator *regulator, 2642 int min_uA, int max_uA) 2643{ 2644 struct regulator_dev *rdev = regulator->rdev; 2645 int ret; 2646 2647 mutex_lock(&rdev->mutex); 2648 2649 /* sanity check */ 2650 if (!rdev->desc->ops->set_current_limit) { 2651 ret = -EINVAL; 2652 goto out; 2653 } 2654 2655 /* constraints check */ 2656 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2657 if (ret < 0) 2658 goto out; 2659 2660 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2661out: 2662 mutex_unlock(&rdev->mutex); 2663 return ret; 2664} 2665EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2666 2667static int _regulator_get_current_limit(struct regulator_dev *rdev) 2668{ 2669 int ret; 2670 2671 mutex_lock(&rdev->mutex); 2672 2673 /* sanity check */ 2674 if (!rdev->desc->ops->get_current_limit) { 2675 ret = -EINVAL; 2676 goto out; 2677 } 2678 2679 ret = rdev->desc->ops->get_current_limit(rdev); 2680out: 2681 mutex_unlock(&rdev->mutex); 2682 return ret; 2683} 2684 2685/** 2686 * regulator_get_current_limit - get regulator output current 2687 * @regulator: regulator source 2688 * 2689 * This returns the current supplied by the specified current sink in uA. 2690 * 2691 * NOTE: If the regulator is disabled it will return the current value. This 2692 * function should not be used to determine regulator state. 2693 */ 2694int regulator_get_current_limit(struct regulator *regulator) 2695{ 2696 return _regulator_get_current_limit(regulator->rdev); 2697} 2698EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2699 2700/** 2701 * regulator_set_mode - set regulator operating mode 2702 * @regulator: regulator source 2703 * @mode: operating mode - one of the REGULATOR_MODE constants 2704 * 2705 * Set regulator operating mode to increase regulator efficiency or improve 2706 * regulation performance. 2707 * 2708 * NOTE: Regulator system constraints must be set for this regulator before 2709 * calling this function otherwise this call will fail. 2710 */ 2711int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2712{ 2713 struct regulator_dev *rdev = regulator->rdev; 2714 int ret; 2715 int regulator_curr_mode; 2716 2717 mutex_lock(&rdev->mutex); 2718 2719 /* sanity check */ 2720 if (!rdev->desc->ops->set_mode) { 2721 ret = -EINVAL; 2722 goto out; 2723 } 2724 2725 /* return if the same mode is requested */ 2726 if (rdev->desc->ops->get_mode) { 2727 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2728 if (regulator_curr_mode == mode) { 2729 ret = 0; 2730 goto out; 2731 } 2732 } 2733 2734 /* constraints check */ 2735 ret = regulator_mode_constrain(rdev, &mode); 2736 if (ret < 0) 2737 goto out; 2738 2739 ret = rdev->desc->ops->set_mode(rdev, mode); 2740out: 2741 mutex_unlock(&rdev->mutex); 2742 return ret; 2743} 2744EXPORT_SYMBOL_GPL(regulator_set_mode); 2745 2746static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2747{ 2748 int ret; 2749 2750 mutex_lock(&rdev->mutex); 2751 2752 /* sanity check */ 2753 if (!rdev->desc->ops->get_mode) { 2754 ret = -EINVAL; 2755 goto out; 2756 } 2757 2758 ret = rdev->desc->ops->get_mode(rdev); 2759out: 2760 mutex_unlock(&rdev->mutex); 2761 return ret; 2762} 2763 2764/** 2765 * regulator_get_mode - get regulator operating mode 2766 * @regulator: regulator source 2767 * 2768 * Get the current regulator operating mode. 2769 */ 2770unsigned int regulator_get_mode(struct regulator *regulator) 2771{ 2772 return _regulator_get_mode(regulator->rdev); 2773} 2774EXPORT_SYMBOL_GPL(regulator_get_mode); 2775 2776/** 2777 * regulator_set_optimum_mode - set regulator optimum operating mode 2778 * @regulator: regulator source 2779 * @uA_load: load current 2780 * 2781 * Notifies the regulator core of a new device load. This is then used by 2782 * DRMS (if enabled by constraints) to set the most efficient regulator 2783 * operating mode for the new regulator loading. 2784 * 2785 * Consumer devices notify their supply regulator of the maximum power 2786 * they will require (can be taken from device datasheet in the power 2787 * consumption tables) when they change operational status and hence power 2788 * state. Examples of operational state changes that can affect power 2789 * consumption are :- 2790 * 2791 * o Device is opened / closed. 2792 * o Device I/O is about to begin or has just finished. 2793 * o Device is idling in between work. 2794 * 2795 * This information is also exported via sysfs to userspace. 2796 * 2797 * DRMS will sum the total requested load on the regulator and change 2798 * to the most efficient operating mode if platform constraints allow. 2799 * 2800 * Returns the new regulator mode or error. 2801 */ 2802int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2803{ 2804 struct regulator_dev *rdev = regulator->rdev; 2805 struct regulator *consumer; 2806 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2807 unsigned int mode; 2808 2809 if (rdev->supply) 2810 input_uV = regulator_get_voltage(rdev->supply); 2811 2812 mutex_lock(&rdev->mutex); 2813 2814 /* 2815 * first check to see if we can set modes at all, otherwise just 2816 * tell the consumer everything is OK. 2817 */ 2818 regulator->uA_load = uA_load; 2819 ret = regulator_check_drms(rdev); 2820 if (ret < 0) { 2821 ret = 0; 2822 goto out; 2823 } 2824 2825 if (!rdev->desc->ops->get_optimum_mode) 2826 goto out; 2827 2828 /* 2829 * we can actually do this so any errors are indicators of 2830 * potential real failure. 2831 */ 2832 ret = -EINVAL; 2833 2834 if (!rdev->desc->ops->set_mode) 2835 goto out; 2836 2837 /* get output voltage */ 2838 output_uV = _regulator_get_voltage(rdev); 2839 if (output_uV <= 0) { 2840 rdev_err(rdev, "invalid output voltage found\n"); 2841 goto out; 2842 } 2843 2844 /* No supply? Use constraint voltage */ 2845 if (input_uV <= 0) 2846 input_uV = rdev->constraints->input_uV; 2847 if (input_uV <= 0) { 2848 rdev_err(rdev, "invalid input voltage found\n"); 2849 goto out; 2850 } 2851 2852 /* calc total requested load for this regulator */ 2853 list_for_each_entry(consumer, &rdev->consumer_list, list) 2854 total_uA_load += consumer->uA_load; 2855 2856 mode = rdev->desc->ops->get_optimum_mode(rdev, 2857 input_uV, output_uV, 2858 total_uA_load); 2859 ret = regulator_mode_constrain(rdev, &mode); 2860 if (ret < 0) { 2861 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2862 total_uA_load, input_uV, output_uV); 2863 goto out; 2864 } 2865 2866 ret = rdev->desc->ops->set_mode(rdev, mode); 2867 if (ret < 0) { 2868 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2869 goto out; 2870 } 2871 ret = mode; 2872out: 2873 mutex_unlock(&rdev->mutex); 2874 return ret; 2875} 2876EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2877 2878/** 2879 * regulator_allow_bypass - allow the regulator to go into bypass mode 2880 * 2881 * @regulator: Regulator to configure 2882 * @enable: enable or disable bypass mode 2883 * 2884 * Allow the regulator to go into bypass mode if all other consumers 2885 * for the regulator also enable bypass mode and the machine 2886 * constraints allow this. Bypass mode means that the regulator is 2887 * simply passing the input directly to the output with no regulation. 2888 */ 2889int regulator_allow_bypass(struct regulator *regulator, bool enable) 2890{ 2891 struct regulator_dev *rdev = regulator->rdev; 2892 int ret = 0; 2893 2894 if (!rdev->desc->ops->set_bypass) 2895 return 0; 2896 2897 if (rdev->constraints && 2898 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2899 return 0; 2900 2901 mutex_lock(&rdev->mutex); 2902 2903 if (enable && !regulator->bypass) { 2904 rdev->bypass_count++; 2905 2906 if (rdev->bypass_count == rdev->open_count) { 2907 ret = rdev->desc->ops->set_bypass(rdev, enable); 2908 if (ret != 0) 2909 rdev->bypass_count--; 2910 } 2911 2912 } else if (!enable && regulator->bypass) { 2913 rdev->bypass_count--; 2914 2915 if (rdev->bypass_count != rdev->open_count) { 2916 ret = rdev->desc->ops->set_bypass(rdev, enable); 2917 if (ret != 0) 2918 rdev->bypass_count++; 2919 } 2920 } 2921 2922 if (ret == 0) 2923 regulator->bypass = enable; 2924 2925 mutex_unlock(&rdev->mutex); 2926 2927 return ret; 2928} 2929EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2930 2931/** 2932 * regulator_register_notifier - register regulator event notifier 2933 * @regulator: regulator source 2934 * @nb: notifier block 2935 * 2936 * Register notifier block to receive regulator events. 2937 */ 2938int regulator_register_notifier(struct regulator *regulator, 2939 struct notifier_block *nb) 2940{ 2941 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2942 nb); 2943} 2944EXPORT_SYMBOL_GPL(regulator_register_notifier); 2945 2946/** 2947 * regulator_unregister_notifier - unregister regulator event notifier 2948 * @regulator: regulator source 2949 * @nb: notifier block 2950 * 2951 * Unregister regulator event notifier block. 2952 */ 2953int regulator_unregister_notifier(struct regulator *regulator, 2954 struct notifier_block *nb) 2955{ 2956 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2957 nb); 2958} 2959EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2960 2961/* notify regulator consumers and downstream regulator consumers. 2962 * Note mutex must be held by caller. 2963 */ 2964static void _notifier_call_chain(struct regulator_dev *rdev, 2965 unsigned long event, void *data) 2966{ 2967 /* call rdev chain first */ 2968 blocking_notifier_call_chain(&rdev->notifier, event, data); 2969} 2970 2971/** 2972 * regulator_bulk_get - get multiple regulator consumers 2973 * 2974 * @dev: Device to supply 2975 * @num_consumers: Number of consumers to register 2976 * @consumers: Configuration of consumers; clients are stored here. 2977 * 2978 * @return 0 on success, an errno on failure. 2979 * 2980 * This helper function allows drivers to get several regulator 2981 * consumers in one operation. If any of the regulators cannot be 2982 * acquired then any regulators that were allocated will be freed 2983 * before returning to the caller. 2984 */ 2985int regulator_bulk_get(struct device *dev, int num_consumers, 2986 struct regulator_bulk_data *consumers) 2987{ 2988 int i; 2989 int ret; 2990 2991 for (i = 0; i < num_consumers; i++) 2992 consumers[i].consumer = NULL; 2993 2994 for (i = 0; i < num_consumers; i++) { 2995 consumers[i].consumer = regulator_get(dev, 2996 consumers[i].supply); 2997 if (IS_ERR(consumers[i].consumer)) { 2998 ret = PTR_ERR(consumers[i].consumer); 2999 dev_err(dev, "Failed to get supply '%s': %d\n", 3000 consumers[i].supply, ret); 3001 consumers[i].consumer = NULL; 3002 goto err; 3003 } 3004 } 3005 3006 return 0; 3007 3008err: 3009 while (--i >= 0) 3010 regulator_put(consumers[i].consumer); 3011 3012 return ret; 3013} 3014EXPORT_SYMBOL_GPL(regulator_bulk_get); 3015 3016static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3017{ 3018 struct regulator_bulk_data *bulk = data; 3019 3020 bulk->ret = regulator_enable(bulk->consumer); 3021} 3022 3023/** 3024 * regulator_bulk_enable - enable multiple regulator consumers 3025 * 3026 * @num_consumers: Number of consumers 3027 * @consumers: Consumer data; clients are stored here. 3028 * @return 0 on success, an errno on failure 3029 * 3030 * This convenience API allows consumers to enable multiple regulator 3031 * clients in a single API call. If any consumers cannot be enabled 3032 * then any others that were enabled will be disabled again prior to 3033 * return. 3034 */ 3035int regulator_bulk_enable(int num_consumers, 3036 struct regulator_bulk_data *consumers) 3037{ 3038 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3039 int i; 3040 int ret = 0; 3041 3042 for (i = 0; i < num_consumers; i++) { 3043 if (consumers[i].consumer->always_on) 3044 consumers[i].ret = 0; 3045 else 3046 async_schedule_domain(regulator_bulk_enable_async, 3047 &consumers[i], &async_domain); 3048 } 3049 3050 async_synchronize_full_domain(&async_domain); 3051 3052 /* If any consumer failed we need to unwind any that succeeded */ 3053 for (i = 0; i < num_consumers; i++) { 3054 if (consumers[i].ret != 0) { 3055 ret = consumers[i].ret; 3056 goto err; 3057 } 3058 } 3059 3060 return 0; 3061 3062err: 3063 for (i = 0; i < num_consumers; i++) { 3064 if (consumers[i].ret < 0) 3065 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3066 consumers[i].ret); 3067 else 3068 regulator_disable(consumers[i].consumer); 3069 } 3070 3071 return ret; 3072} 3073EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3074 3075/** 3076 * regulator_bulk_disable - disable multiple regulator consumers 3077 * 3078 * @num_consumers: Number of consumers 3079 * @consumers: Consumer data; clients are stored here. 3080 * @return 0 on success, an errno on failure 3081 * 3082 * This convenience API allows consumers to disable multiple regulator 3083 * clients in a single API call. If any consumers cannot be disabled 3084 * then any others that were disabled will be enabled again prior to 3085 * return. 3086 */ 3087int regulator_bulk_disable(int num_consumers, 3088 struct regulator_bulk_data *consumers) 3089{ 3090 int i; 3091 int ret, r; 3092 3093 for (i = num_consumers - 1; i >= 0; --i) { 3094 ret = regulator_disable(consumers[i].consumer); 3095 if (ret != 0) 3096 goto err; 3097 } 3098 3099 return 0; 3100 3101err: 3102 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3103 for (++i; i < num_consumers; ++i) { 3104 r = regulator_enable(consumers[i].consumer); 3105 if (r != 0) 3106 pr_err("Failed to reename %s: %d\n", 3107 consumers[i].supply, r); 3108 } 3109 3110 return ret; 3111} 3112EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3113 3114/** 3115 * regulator_bulk_force_disable - force disable multiple regulator consumers 3116 * 3117 * @num_consumers: Number of consumers 3118 * @consumers: Consumer data; clients are stored here. 3119 * @return 0 on success, an errno on failure 3120 * 3121 * This convenience API allows consumers to forcibly disable multiple regulator 3122 * clients in a single API call. 3123 * NOTE: This should be used for situations when device damage will 3124 * likely occur if the regulators are not disabled (e.g. over temp). 3125 * Although regulator_force_disable function call for some consumers can 3126 * return error numbers, the function is called for all consumers. 3127 */ 3128int regulator_bulk_force_disable(int num_consumers, 3129 struct regulator_bulk_data *consumers) 3130{ 3131 int i; 3132 int ret; 3133 3134 for (i = 0; i < num_consumers; i++) 3135 consumers[i].ret = 3136 regulator_force_disable(consumers[i].consumer); 3137 3138 for (i = 0; i < num_consumers; i++) { 3139 if (consumers[i].ret != 0) { 3140 ret = consumers[i].ret; 3141 goto out; 3142 } 3143 } 3144 3145 return 0; 3146out: 3147 return ret; 3148} 3149EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3150 3151/** 3152 * regulator_bulk_free - free multiple regulator consumers 3153 * 3154 * @num_consumers: Number of consumers 3155 * @consumers: Consumer data; clients are stored here. 3156 * 3157 * This convenience API allows consumers to free multiple regulator 3158 * clients in a single API call. 3159 */ 3160void regulator_bulk_free(int num_consumers, 3161 struct regulator_bulk_data *consumers) 3162{ 3163 int i; 3164 3165 for (i = 0; i < num_consumers; i++) { 3166 regulator_put(consumers[i].consumer); 3167 consumers[i].consumer = NULL; 3168 } 3169} 3170EXPORT_SYMBOL_GPL(regulator_bulk_free); 3171 3172/** 3173 * regulator_notifier_call_chain - call regulator event notifier 3174 * @rdev: regulator source 3175 * @event: notifier block 3176 * @data: callback-specific data. 3177 * 3178 * Called by regulator drivers to notify clients a regulator event has 3179 * occurred. We also notify regulator clients downstream. 3180 * Note lock must be held by caller. 3181 */ 3182int regulator_notifier_call_chain(struct regulator_dev *rdev, 3183 unsigned long event, void *data) 3184{ 3185 _notifier_call_chain(rdev, event, data); 3186 return NOTIFY_DONE; 3187 3188} 3189EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3190 3191/** 3192 * regulator_mode_to_status - convert a regulator mode into a status 3193 * 3194 * @mode: Mode to convert 3195 * 3196 * Convert a regulator mode into a status. 3197 */ 3198int regulator_mode_to_status(unsigned int mode) 3199{ 3200 switch (mode) { 3201 case REGULATOR_MODE_FAST: 3202 return REGULATOR_STATUS_FAST; 3203 case REGULATOR_MODE_NORMAL: 3204 return REGULATOR_STATUS_NORMAL; 3205 case REGULATOR_MODE_IDLE: 3206 return REGULATOR_STATUS_IDLE; 3207 case REGULATOR_MODE_STANDBY: 3208 return REGULATOR_STATUS_STANDBY; 3209 default: 3210 return REGULATOR_STATUS_UNDEFINED; 3211 } 3212} 3213EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3214 3215/* 3216 * To avoid cluttering sysfs (and memory) with useless state, only 3217 * create attributes that can be meaningfully displayed. 3218 */ 3219static int add_regulator_attributes(struct regulator_dev *rdev) 3220{ 3221 struct device *dev = &rdev->dev; 3222 struct regulator_ops *ops = rdev->desc->ops; 3223 int status = 0; 3224 3225 /* some attributes need specific methods to be displayed */ 3226 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3227 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3228 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || 3229 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { 3230 status = device_create_file(dev, &dev_attr_microvolts); 3231 if (status < 0) 3232 return status; 3233 } 3234 if (ops->get_current_limit) { 3235 status = device_create_file(dev, &dev_attr_microamps); 3236 if (status < 0) 3237 return status; 3238 } 3239 if (ops->get_mode) { 3240 status = device_create_file(dev, &dev_attr_opmode); 3241 if (status < 0) 3242 return status; 3243 } 3244 if (rdev->ena_pin || ops->is_enabled) { 3245 status = device_create_file(dev, &dev_attr_state); 3246 if (status < 0) 3247 return status; 3248 } 3249 if (ops->get_status) { 3250 status = device_create_file(dev, &dev_attr_status); 3251 if (status < 0) 3252 return status; 3253 } 3254 if (ops->get_bypass) { 3255 status = device_create_file(dev, &dev_attr_bypass); 3256 if (status < 0) 3257 return status; 3258 } 3259 3260 /* some attributes are type-specific */ 3261 if (rdev->desc->type == REGULATOR_CURRENT) { 3262 status = device_create_file(dev, &dev_attr_requested_microamps); 3263 if (status < 0) 3264 return status; 3265 } 3266 3267 /* all the other attributes exist to support constraints; 3268 * don't show them if there are no constraints, or if the 3269 * relevant supporting methods are missing. 3270 */ 3271 if (!rdev->constraints) 3272 return status; 3273 3274 /* constraints need specific supporting methods */ 3275 if (ops->set_voltage || ops->set_voltage_sel) { 3276 status = device_create_file(dev, &dev_attr_min_microvolts); 3277 if (status < 0) 3278 return status; 3279 status = device_create_file(dev, &dev_attr_max_microvolts); 3280 if (status < 0) 3281 return status; 3282 } 3283 if (ops->set_current_limit) { 3284 status = device_create_file(dev, &dev_attr_min_microamps); 3285 if (status < 0) 3286 return status; 3287 status = device_create_file(dev, &dev_attr_max_microamps); 3288 if (status < 0) 3289 return status; 3290 } 3291 3292 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3293 if (status < 0) 3294 return status; 3295 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3296 if (status < 0) 3297 return status; 3298 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3299 if (status < 0) 3300 return status; 3301 3302 if (ops->set_suspend_voltage) { 3303 status = device_create_file(dev, 3304 &dev_attr_suspend_standby_microvolts); 3305 if (status < 0) 3306 return status; 3307 status = device_create_file(dev, 3308 &dev_attr_suspend_mem_microvolts); 3309 if (status < 0) 3310 return status; 3311 status = device_create_file(dev, 3312 &dev_attr_suspend_disk_microvolts); 3313 if (status < 0) 3314 return status; 3315 } 3316 3317 if (ops->set_suspend_mode) { 3318 status = device_create_file(dev, 3319 &dev_attr_suspend_standby_mode); 3320 if (status < 0) 3321 return status; 3322 status = device_create_file(dev, 3323 &dev_attr_suspend_mem_mode); 3324 if (status < 0) 3325 return status; 3326 status = device_create_file(dev, 3327 &dev_attr_suspend_disk_mode); 3328 if (status < 0) 3329 return status; 3330 } 3331 3332 return status; 3333} 3334 3335static void rdev_init_debugfs(struct regulator_dev *rdev) 3336{ 3337 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3338 if (!rdev->debugfs) { 3339 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3340 return; 3341 } 3342 3343 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3344 &rdev->use_count); 3345 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3346 &rdev->open_count); 3347 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3348 &rdev->bypass_count); 3349} 3350 3351/** 3352 * regulator_register - register regulator 3353 * @regulator_desc: regulator to register 3354 * @config: runtime configuration for regulator 3355 * 3356 * Called by regulator drivers to register a regulator. 3357 * Returns a valid pointer to struct regulator_dev on success 3358 * or an ERR_PTR() on error. 3359 */ 3360struct regulator_dev * 3361regulator_register(const struct regulator_desc *regulator_desc, 3362 const struct regulator_config *config) 3363{ 3364 const struct regulation_constraints *constraints = NULL; 3365 const struct regulator_init_data *init_data; 3366 static atomic_t regulator_no = ATOMIC_INIT(0); 3367 struct regulator_dev *rdev; 3368 struct device *dev; 3369 int ret, i; 3370 const char *supply = NULL; 3371 3372 if (regulator_desc == NULL || config == NULL) 3373 return ERR_PTR(-EINVAL); 3374 3375 dev = config->dev; 3376 WARN_ON(!dev); 3377 3378 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3379 return ERR_PTR(-EINVAL); 3380 3381 if (regulator_desc->type != REGULATOR_VOLTAGE && 3382 regulator_desc->type != REGULATOR_CURRENT) 3383 return ERR_PTR(-EINVAL); 3384 3385 /* Only one of each should be implemented */ 3386 WARN_ON(regulator_desc->ops->get_voltage && 3387 regulator_desc->ops->get_voltage_sel); 3388 WARN_ON(regulator_desc->ops->set_voltage && 3389 regulator_desc->ops->set_voltage_sel); 3390 3391 /* If we're using selectors we must implement list_voltage. */ 3392 if (regulator_desc->ops->get_voltage_sel && 3393 !regulator_desc->ops->list_voltage) { 3394 return ERR_PTR(-EINVAL); 3395 } 3396 if (regulator_desc->ops->set_voltage_sel && 3397 !regulator_desc->ops->list_voltage) { 3398 return ERR_PTR(-EINVAL); 3399 } 3400 3401 init_data = config->init_data; 3402 3403 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3404 if (rdev == NULL) 3405 return ERR_PTR(-ENOMEM); 3406 3407 mutex_lock(®ulator_list_mutex); 3408 3409 mutex_init(&rdev->mutex); 3410 rdev->reg_data = config->driver_data; 3411 rdev->owner = regulator_desc->owner; 3412 rdev->desc = regulator_desc; 3413 if (config->regmap) 3414 rdev->regmap = config->regmap; 3415 else if (dev_get_regmap(dev, NULL)) 3416 rdev->regmap = dev_get_regmap(dev, NULL); 3417 else if (dev->parent) 3418 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3419 INIT_LIST_HEAD(&rdev->consumer_list); 3420 INIT_LIST_HEAD(&rdev->list); 3421 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3422 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3423 3424 /* preform any regulator specific init */ 3425 if (init_data && init_data->regulator_init) { 3426 ret = init_data->regulator_init(rdev->reg_data); 3427 if (ret < 0) 3428 goto clean; 3429 } 3430 3431 /* register with sysfs */ 3432 rdev->dev.class = ®ulator_class; 3433 rdev->dev.of_node = config->of_node; 3434 rdev->dev.parent = dev; 3435 dev_set_name(&rdev->dev, "regulator.%d", 3436 atomic_inc_return(®ulator_no) - 1); 3437 ret = device_register(&rdev->dev); 3438 if (ret != 0) { 3439 put_device(&rdev->dev); 3440 goto clean; 3441 } 3442 3443 dev_set_drvdata(&rdev->dev, rdev); 3444 3445 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3446 ret = regulator_ena_gpio_request(rdev, config); 3447 if (ret != 0) { 3448 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3449 config->ena_gpio, ret); 3450 goto wash; 3451 } 3452 3453 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3454 rdev->ena_gpio_state = 1; 3455 3456 if (config->ena_gpio_invert) 3457 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3458 } 3459 3460 /* set regulator constraints */ 3461 if (init_data) 3462 constraints = &init_data->constraints; 3463 3464 ret = set_machine_constraints(rdev, constraints); 3465 if (ret < 0) 3466 goto scrub; 3467 3468 /* add attributes supported by this regulator */ 3469 ret = add_regulator_attributes(rdev); 3470 if (ret < 0) 3471 goto scrub; 3472 3473 if (init_data && init_data->supply_regulator) 3474 supply = init_data->supply_regulator; 3475 else if (regulator_desc->supply_name) 3476 supply = regulator_desc->supply_name; 3477 3478 if (supply) { 3479 struct regulator_dev *r; 3480 3481 r = regulator_dev_lookup(dev, supply, &ret); 3482 3483 if (ret == -ENODEV) { 3484 /* 3485 * No supply was specified for this regulator and 3486 * there will never be one. 3487 */ 3488 ret = 0; 3489 goto add_dev; 3490 } else if (!r) { 3491 dev_err(dev, "Failed to find supply %s\n", supply); 3492 ret = -EPROBE_DEFER; 3493 goto scrub; 3494 } 3495 3496 ret = set_supply(rdev, r); 3497 if (ret < 0) 3498 goto scrub; 3499 3500 /* Enable supply if rail is enabled */ 3501 if (_regulator_is_enabled(rdev)) { 3502 ret = regulator_enable(rdev->supply); 3503 if (ret < 0) 3504 goto scrub; 3505 } 3506 } 3507 3508add_dev: 3509 /* add consumers devices */ 3510 if (init_data) { 3511 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3512 ret = set_consumer_device_supply(rdev, 3513 init_data->consumer_supplies[i].dev_name, 3514 init_data->consumer_supplies[i].supply); 3515 if (ret < 0) { 3516 dev_err(dev, "Failed to set supply %s\n", 3517 init_data->consumer_supplies[i].supply); 3518 goto unset_supplies; 3519 } 3520 } 3521 } 3522 3523 list_add(&rdev->list, ®ulator_list); 3524 3525 rdev_init_debugfs(rdev); 3526out: 3527 mutex_unlock(®ulator_list_mutex); 3528 return rdev; 3529 3530unset_supplies: 3531 unset_regulator_supplies(rdev); 3532 3533scrub: 3534 if (rdev->supply) 3535 _regulator_put(rdev->supply); 3536 regulator_ena_gpio_free(rdev); 3537 kfree(rdev->constraints); 3538wash: 3539 device_unregister(&rdev->dev); 3540 /* device core frees rdev */ 3541 rdev = ERR_PTR(ret); 3542 goto out; 3543 3544clean: 3545 kfree(rdev); 3546 rdev = ERR_PTR(ret); 3547 goto out; 3548} 3549EXPORT_SYMBOL_GPL(regulator_register); 3550 3551/** 3552 * regulator_unregister - unregister regulator 3553 * @rdev: regulator to unregister 3554 * 3555 * Called by regulator drivers to unregister a regulator. 3556 */ 3557void regulator_unregister(struct regulator_dev *rdev) 3558{ 3559 if (rdev == NULL) 3560 return; 3561 3562 if (rdev->supply) { 3563 while (rdev->use_count--) 3564 regulator_disable(rdev->supply); 3565 regulator_put(rdev->supply); 3566 } 3567 mutex_lock(®ulator_list_mutex); 3568 debugfs_remove_recursive(rdev->debugfs); 3569 flush_work(&rdev->disable_work.work); 3570 WARN_ON(rdev->open_count); 3571 unset_regulator_supplies(rdev); 3572 list_del(&rdev->list); 3573 kfree(rdev->constraints); 3574 regulator_ena_gpio_free(rdev); 3575 device_unregister(&rdev->dev); 3576 mutex_unlock(®ulator_list_mutex); 3577} 3578EXPORT_SYMBOL_GPL(regulator_unregister); 3579 3580/** 3581 * regulator_suspend_prepare - prepare regulators for system wide suspend 3582 * @state: system suspend state 3583 * 3584 * Configure each regulator with it's suspend operating parameters for state. 3585 * This will usually be called by machine suspend code prior to supending. 3586 */ 3587int regulator_suspend_prepare(suspend_state_t state) 3588{ 3589 struct regulator_dev *rdev; 3590 int ret = 0; 3591 3592 /* ON is handled by regulator active state */ 3593 if (state == PM_SUSPEND_ON) 3594 return -EINVAL; 3595 3596 mutex_lock(®ulator_list_mutex); 3597 list_for_each_entry(rdev, ®ulator_list, list) { 3598 3599 mutex_lock(&rdev->mutex); 3600 ret = suspend_prepare(rdev, state); 3601 mutex_unlock(&rdev->mutex); 3602 3603 if (ret < 0) { 3604 rdev_err(rdev, "failed to prepare\n"); 3605 goto out; 3606 } 3607 } 3608out: 3609 mutex_unlock(®ulator_list_mutex); 3610 return ret; 3611} 3612EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3613 3614/** 3615 * regulator_suspend_finish - resume regulators from system wide suspend 3616 * 3617 * Turn on regulators that might be turned off by regulator_suspend_prepare 3618 * and that should be turned on according to the regulators properties. 3619 */ 3620int regulator_suspend_finish(void) 3621{ 3622 struct regulator_dev *rdev; 3623 int ret = 0, error; 3624 3625 mutex_lock(®ulator_list_mutex); 3626 list_for_each_entry(rdev, ®ulator_list, list) { 3627 struct regulator_ops *ops = rdev->desc->ops; 3628 3629 mutex_lock(&rdev->mutex); 3630 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3631 ops->enable) { 3632 error = ops->enable(rdev); 3633 if (error) 3634 ret = error; 3635 } else { 3636 if (!have_full_constraints()) 3637 goto unlock; 3638 if (!ops->disable) 3639 goto unlock; 3640 if (!_regulator_is_enabled(rdev)) 3641 goto unlock; 3642 3643 error = ops->disable(rdev); 3644 if (error) 3645 ret = error; 3646 } 3647unlock: 3648 mutex_unlock(&rdev->mutex); 3649 } 3650 mutex_unlock(®ulator_list_mutex); 3651 return ret; 3652} 3653EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3654 3655/** 3656 * regulator_has_full_constraints - the system has fully specified constraints 3657 * 3658 * Calling this function will cause the regulator API to disable all 3659 * regulators which have a zero use count and don't have an always_on 3660 * constraint in a late_initcall. 3661 * 3662 * The intention is that this will become the default behaviour in a 3663 * future kernel release so users are encouraged to use this facility 3664 * now. 3665 */ 3666void regulator_has_full_constraints(void) 3667{ 3668 has_full_constraints = 1; 3669} 3670EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3671 3672/** 3673 * rdev_get_drvdata - get rdev regulator driver data 3674 * @rdev: regulator 3675 * 3676 * Get rdev regulator driver private data. This call can be used in the 3677 * regulator driver context. 3678 */ 3679void *rdev_get_drvdata(struct regulator_dev *rdev) 3680{ 3681 return rdev->reg_data; 3682} 3683EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3684 3685/** 3686 * regulator_get_drvdata - get regulator driver data 3687 * @regulator: regulator 3688 * 3689 * Get regulator driver private data. This call can be used in the consumer 3690 * driver context when non API regulator specific functions need to be called. 3691 */ 3692void *regulator_get_drvdata(struct regulator *regulator) 3693{ 3694 return regulator->rdev->reg_data; 3695} 3696EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3697 3698/** 3699 * regulator_set_drvdata - set regulator driver data 3700 * @regulator: regulator 3701 * @data: data 3702 */ 3703void regulator_set_drvdata(struct regulator *regulator, void *data) 3704{ 3705 regulator->rdev->reg_data = data; 3706} 3707EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3708 3709/** 3710 * regulator_get_id - get regulator ID 3711 * @rdev: regulator 3712 */ 3713int rdev_get_id(struct regulator_dev *rdev) 3714{ 3715 return rdev->desc->id; 3716} 3717EXPORT_SYMBOL_GPL(rdev_get_id); 3718 3719struct device *rdev_get_dev(struct regulator_dev *rdev) 3720{ 3721 return &rdev->dev; 3722} 3723EXPORT_SYMBOL_GPL(rdev_get_dev); 3724 3725void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3726{ 3727 return reg_init_data->driver_data; 3728} 3729EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3730 3731#ifdef CONFIG_DEBUG_FS 3732static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3733 size_t count, loff_t *ppos) 3734{ 3735 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3736 ssize_t len, ret = 0; 3737 struct regulator_map *map; 3738 3739 if (!buf) 3740 return -ENOMEM; 3741 3742 list_for_each_entry(map, ®ulator_map_list, list) { 3743 len = snprintf(buf + ret, PAGE_SIZE - ret, 3744 "%s -> %s.%s\n", 3745 rdev_get_name(map->regulator), map->dev_name, 3746 map->supply); 3747 if (len >= 0) 3748 ret += len; 3749 if (ret > PAGE_SIZE) { 3750 ret = PAGE_SIZE; 3751 break; 3752 } 3753 } 3754 3755 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3756 3757 kfree(buf); 3758 3759 return ret; 3760} 3761#endif 3762 3763static const struct file_operations supply_map_fops = { 3764#ifdef CONFIG_DEBUG_FS 3765 .read = supply_map_read_file, 3766 .llseek = default_llseek, 3767#endif 3768}; 3769 3770static int __init regulator_init(void) 3771{ 3772 int ret; 3773 3774 ret = class_register(®ulator_class); 3775 3776 debugfs_root = debugfs_create_dir("regulator", NULL); 3777 if (!debugfs_root) 3778 pr_warn("regulator: Failed to create debugfs directory\n"); 3779 3780 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3781 &supply_map_fops); 3782 3783 regulator_dummy_init(); 3784 3785 return ret; 3786} 3787 3788/* init early to allow our consumers to complete system booting */ 3789core_initcall(regulator_init); 3790 3791static int __init regulator_init_complete(void) 3792{ 3793 struct regulator_dev *rdev; 3794 struct regulator_ops *ops; 3795 struct regulation_constraints *c; 3796 int enabled, ret; 3797 3798 /* 3799 * Since DT doesn't provide an idiomatic mechanism for 3800 * enabling full constraints and since it's much more natural 3801 * with DT to provide them just assume that a DT enabled 3802 * system has full constraints. 3803 */ 3804 if (of_have_populated_dt()) 3805 has_full_constraints = true; 3806 3807 mutex_lock(®ulator_list_mutex); 3808 3809 /* If we have a full configuration then disable any regulators 3810 * which are not in use or always_on. This will become the 3811 * default behaviour in the future. 3812 */ 3813 list_for_each_entry(rdev, ®ulator_list, list) { 3814 ops = rdev->desc->ops; 3815 c = rdev->constraints; 3816 3817 if (!ops->disable || (c && c->always_on)) 3818 continue; 3819 3820 mutex_lock(&rdev->mutex); 3821 3822 if (rdev->use_count) 3823 goto unlock; 3824 3825 /* If we can't read the status assume it's on. */ 3826 if (ops->is_enabled) 3827 enabled = ops->is_enabled(rdev); 3828 else 3829 enabled = 1; 3830 3831 if (!enabled) 3832 goto unlock; 3833 3834 if (have_full_constraints()) { 3835 /* We log since this may kill the system if it 3836 * goes wrong. */ 3837 rdev_info(rdev, "disabling\n"); 3838 ret = ops->disable(rdev); 3839 if (ret != 0) { 3840 rdev_err(rdev, "couldn't disable: %d\n", ret); 3841 } 3842 } else { 3843 /* The intention is that in future we will 3844 * assume that full constraints are provided 3845 * so warn even if we aren't going to do 3846 * anything here. 3847 */ 3848 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3849 } 3850 3851unlock: 3852 mutex_unlock(&rdev->mutex); 3853 } 3854 3855 mutex_unlock(®ulator_list_mutex); 3856 3857 return 0; 3858} 3859late_initcall(regulator_init_complete); 3860