core.c revision 69c3f7239e29216fbf92a39c86b4e9cc63cd6d74
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 956static int _regulator_do_enable(struct regulator_dev *rdev); 957 958/** 959 * set_machine_constraints - sets regulator constraints 960 * @rdev: regulator source 961 * @constraints: constraints to apply 962 * 963 * Allows platform initialisation code to define and constrain 964 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 965 * Constraints *must* be set by platform code in order for some 966 * regulator operations to proceed i.e. set_voltage, set_current_limit, 967 * set_mode. 968 */ 969static int set_machine_constraints(struct regulator_dev *rdev, 970 const struct regulation_constraints *constraints) 971{ 972 int ret = 0; 973 struct regulator_ops *ops = rdev->desc->ops; 974 975 if (constraints) 976 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 977 GFP_KERNEL); 978 else 979 rdev->constraints = kzalloc(sizeof(*constraints), 980 GFP_KERNEL); 981 if (!rdev->constraints) 982 return -ENOMEM; 983 984 ret = machine_constraints_voltage(rdev, rdev->constraints); 985 if (ret != 0) 986 goto out; 987 988 ret = machine_constraints_current(rdev, rdev->constraints); 989 if (ret != 0) 990 goto out; 991 992 /* do we need to setup our suspend state */ 993 if (rdev->constraints->initial_state) { 994 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 995 if (ret < 0) { 996 rdev_err(rdev, "failed to set suspend state\n"); 997 goto out; 998 } 999 } 1000 1001 if (rdev->constraints->initial_mode) { 1002 if (!ops->set_mode) { 1003 rdev_err(rdev, "no set_mode operation\n"); 1004 ret = -EINVAL; 1005 goto out; 1006 } 1007 1008 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 1009 if (ret < 0) { 1010 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 1011 goto out; 1012 } 1013 } 1014 1015 /* If the constraints say the regulator should be on at this point 1016 * and we have control then make sure it is enabled. 1017 */ 1018 if (rdev->constraints->always_on || rdev->constraints->boot_on) { 1019 ret = _regulator_do_enable(rdev); 1020 if (ret < 0 && ret != -EINVAL) { 1021 rdev_err(rdev, "failed to enable\n"); 1022 goto out; 1023 } 1024 } 1025 1026 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 1027 && ops->set_ramp_delay) { 1028 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 1029 if (ret < 0) { 1030 rdev_err(rdev, "failed to set ramp_delay\n"); 1031 goto out; 1032 } 1033 } 1034 1035 print_constraints(rdev); 1036 return 0; 1037out: 1038 kfree(rdev->constraints); 1039 rdev->constraints = NULL; 1040 return ret; 1041} 1042 1043/** 1044 * set_supply - set regulator supply regulator 1045 * @rdev: regulator name 1046 * @supply_rdev: supply regulator name 1047 * 1048 * Called by platform initialisation code to set the supply regulator for this 1049 * regulator. This ensures that a regulators supply will also be enabled by the 1050 * core if it's child is enabled. 1051 */ 1052static int set_supply(struct regulator_dev *rdev, 1053 struct regulator_dev *supply_rdev) 1054{ 1055 int err; 1056 1057 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1058 1059 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1060 if (rdev->supply == NULL) { 1061 err = -ENOMEM; 1062 return err; 1063 } 1064 supply_rdev->open_count++; 1065 1066 return 0; 1067} 1068 1069/** 1070 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1071 * @rdev: regulator source 1072 * @consumer_dev_name: dev_name() string for device supply applies to 1073 * @supply: symbolic name for supply 1074 * 1075 * Allows platform initialisation code to map physical regulator 1076 * sources to symbolic names for supplies for use by devices. Devices 1077 * should use these symbolic names to request regulators, avoiding the 1078 * need to provide board-specific regulator names as platform data. 1079 */ 1080static int set_consumer_device_supply(struct regulator_dev *rdev, 1081 const char *consumer_dev_name, 1082 const char *supply) 1083{ 1084 struct regulator_map *node; 1085 int has_dev; 1086 1087 if (supply == NULL) 1088 return -EINVAL; 1089 1090 if (consumer_dev_name != NULL) 1091 has_dev = 1; 1092 else 1093 has_dev = 0; 1094 1095 list_for_each_entry(node, ®ulator_map_list, list) { 1096 if (node->dev_name && consumer_dev_name) { 1097 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1098 continue; 1099 } else if (node->dev_name || consumer_dev_name) { 1100 continue; 1101 } 1102 1103 if (strcmp(node->supply, supply) != 0) 1104 continue; 1105 1106 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1107 consumer_dev_name, 1108 dev_name(&node->regulator->dev), 1109 node->regulator->desc->name, 1110 supply, 1111 dev_name(&rdev->dev), rdev_get_name(rdev)); 1112 return -EBUSY; 1113 } 1114 1115 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1116 if (node == NULL) 1117 return -ENOMEM; 1118 1119 node->regulator = rdev; 1120 node->supply = supply; 1121 1122 if (has_dev) { 1123 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1124 if (node->dev_name == NULL) { 1125 kfree(node); 1126 return -ENOMEM; 1127 } 1128 } 1129 1130 list_add(&node->list, ®ulator_map_list); 1131 return 0; 1132} 1133 1134static void unset_regulator_supplies(struct regulator_dev *rdev) 1135{ 1136 struct regulator_map *node, *n; 1137 1138 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1139 if (rdev == node->regulator) { 1140 list_del(&node->list); 1141 kfree(node->dev_name); 1142 kfree(node); 1143 } 1144 } 1145} 1146 1147#define REG_STR_SIZE 64 1148 1149static struct regulator *create_regulator(struct regulator_dev *rdev, 1150 struct device *dev, 1151 const char *supply_name) 1152{ 1153 struct regulator *regulator; 1154 char buf[REG_STR_SIZE]; 1155 int err, size; 1156 1157 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1158 if (regulator == NULL) 1159 return NULL; 1160 1161 mutex_lock(&rdev->mutex); 1162 regulator->rdev = rdev; 1163 list_add(®ulator->list, &rdev->consumer_list); 1164 1165 if (dev) { 1166 regulator->dev = dev; 1167 1168 /* Add a link to the device sysfs entry */ 1169 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1170 dev->kobj.name, supply_name); 1171 if (size >= REG_STR_SIZE) 1172 goto overflow_err; 1173 1174 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1175 if (regulator->supply_name == NULL) 1176 goto overflow_err; 1177 1178 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1179 buf); 1180 if (err) { 1181 rdev_warn(rdev, "could not add device link %s err %d\n", 1182 dev->kobj.name, err); 1183 /* non-fatal */ 1184 } 1185 } else { 1186 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1187 if (regulator->supply_name == NULL) 1188 goto overflow_err; 1189 } 1190 1191 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1192 rdev->debugfs); 1193 if (!regulator->debugfs) { 1194 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1195 } else { 1196 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1197 ®ulator->uA_load); 1198 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1199 ®ulator->min_uV); 1200 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1201 ®ulator->max_uV); 1202 } 1203 1204 /* 1205 * Check now if the regulator is an always on regulator - if 1206 * it is then we don't need to do nearly so much work for 1207 * enable/disable calls. 1208 */ 1209 if (!_regulator_can_change_status(rdev) && 1210 _regulator_is_enabled(rdev)) 1211 regulator->always_on = true; 1212 1213 mutex_unlock(&rdev->mutex); 1214 return regulator; 1215overflow_err: 1216 list_del(®ulator->list); 1217 kfree(regulator); 1218 mutex_unlock(&rdev->mutex); 1219 return NULL; 1220} 1221 1222static int _regulator_get_enable_time(struct regulator_dev *rdev) 1223{ 1224 if (rdev->constraints && rdev->constraints->enable_time) 1225 return rdev->constraints->enable_time; 1226 if (!rdev->desc->ops->enable_time) 1227 return rdev->desc->enable_time; 1228 return rdev->desc->ops->enable_time(rdev); 1229} 1230 1231static struct regulator_supply_alias *regulator_find_supply_alias( 1232 struct device *dev, const char *supply) 1233{ 1234 struct regulator_supply_alias *map; 1235 1236 list_for_each_entry(map, ®ulator_supply_alias_list, list) 1237 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) 1238 return map; 1239 1240 return NULL; 1241} 1242 1243static void regulator_supply_alias(struct device **dev, const char **supply) 1244{ 1245 struct regulator_supply_alias *map; 1246 1247 map = regulator_find_supply_alias(*dev, *supply); 1248 if (map) { 1249 dev_dbg(*dev, "Mapping supply %s to %s,%s\n", 1250 *supply, map->alias_supply, 1251 dev_name(map->alias_dev)); 1252 *dev = map->alias_dev; 1253 *supply = map->alias_supply; 1254 } 1255} 1256 1257static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1258 const char *supply, 1259 int *ret) 1260{ 1261 struct regulator_dev *r; 1262 struct device_node *node; 1263 struct regulator_map *map; 1264 const char *devname = NULL; 1265 1266 regulator_supply_alias(&dev, &supply); 1267 1268 /* first do a dt based lookup */ 1269 if (dev && dev->of_node) { 1270 node = of_get_regulator(dev, supply); 1271 if (node) { 1272 list_for_each_entry(r, ®ulator_list, list) 1273 if (r->dev.parent && 1274 node == r->dev.of_node) 1275 return r; 1276 *ret = -EPROBE_DEFER; 1277 return NULL; 1278 } else { 1279 /* 1280 * If we couldn't even get the node then it's 1281 * not just that the device didn't register 1282 * yet, there's no node and we'll never 1283 * succeed. 1284 */ 1285 *ret = -ENODEV; 1286 } 1287 } 1288 1289 /* if not found, try doing it non-dt way */ 1290 if (dev) 1291 devname = dev_name(dev); 1292 1293 list_for_each_entry(r, ®ulator_list, list) 1294 if (strcmp(rdev_get_name(r), supply) == 0) 1295 return r; 1296 1297 list_for_each_entry(map, ®ulator_map_list, list) { 1298 /* If the mapping has a device set up it must match */ 1299 if (map->dev_name && 1300 (!devname || strcmp(map->dev_name, devname))) 1301 continue; 1302 1303 if (strcmp(map->supply, supply) == 0) 1304 return map->regulator; 1305 } 1306 1307 1308 return NULL; 1309} 1310 1311/* Internal regulator request function */ 1312static struct regulator *_regulator_get(struct device *dev, const char *id, 1313 bool exclusive, bool allow_dummy) 1314{ 1315 struct regulator_dev *rdev; 1316 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1317 const char *devname = NULL; 1318 int ret; 1319 1320 if (id == NULL) { 1321 pr_err("get() with no identifier\n"); 1322 return ERR_PTR(-EINVAL); 1323 } 1324 1325 if (dev) 1326 devname = dev_name(dev); 1327 1328 if (have_full_constraints()) 1329 ret = -ENODEV; 1330 else 1331 ret = -EPROBE_DEFER; 1332 1333 mutex_lock(®ulator_list_mutex); 1334 1335 rdev = regulator_dev_lookup(dev, id, &ret); 1336 if (rdev) 1337 goto found; 1338 1339 regulator = ERR_PTR(ret); 1340 1341 /* 1342 * If we have return value from dev_lookup fail, we do not expect to 1343 * succeed, so, quit with appropriate error value 1344 */ 1345 if (ret && ret != -ENODEV) 1346 goto out; 1347 1348 if (!devname) 1349 devname = "deviceless"; 1350 1351 /* 1352 * Assume that a regulator is physically present and enabled 1353 * even if it isn't hooked up and just provide a dummy. 1354 */ 1355 if (have_full_constraints() && allow_dummy) { 1356 pr_warn("%s supply %s not found, using dummy regulator\n", 1357 devname, id); 1358 1359 rdev = dummy_regulator_rdev; 1360 goto found; 1361 /* Don't log an error when called from regulator_get_optional() */ 1362 } else if (!have_full_constraints() || exclusive) { 1363 dev_warn(dev, "dummy supplies not allowed\n"); 1364 } 1365 1366 mutex_unlock(®ulator_list_mutex); 1367 return regulator; 1368 1369found: 1370 if (rdev->exclusive) { 1371 regulator = ERR_PTR(-EPERM); 1372 goto out; 1373 } 1374 1375 if (exclusive && rdev->open_count) { 1376 regulator = ERR_PTR(-EBUSY); 1377 goto out; 1378 } 1379 1380 if (!try_module_get(rdev->owner)) 1381 goto out; 1382 1383 regulator = create_regulator(rdev, dev, id); 1384 if (regulator == NULL) { 1385 regulator = ERR_PTR(-ENOMEM); 1386 module_put(rdev->owner); 1387 goto out; 1388 } 1389 1390 rdev->open_count++; 1391 if (exclusive) { 1392 rdev->exclusive = 1; 1393 1394 ret = _regulator_is_enabled(rdev); 1395 if (ret > 0) 1396 rdev->use_count = 1; 1397 else 1398 rdev->use_count = 0; 1399 } 1400 1401out: 1402 mutex_unlock(®ulator_list_mutex); 1403 1404 return regulator; 1405} 1406 1407/** 1408 * regulator_get - lookup and obtain a reference to a regulator. 1409 * @dev: device for regulator "consumer" 1410 * @id: Supply name or regulator ID. 1411 * 1412 * Returns a struct regulator corresponding to the regulator producer, 1413 * or IS_ERR() condition containing errno. 1414 * 1415 * Use of supply names configured via regulator_set_device_supply() is 1416 * strongly encouraged. It is recommended that the supply name used 1417 * should match the name used for the supply and/or the relevant 1418 * device pins in the datasheet. 1419 */ 1420struct regulator *regulator_get(struct device *dev, const char *id) 1421{ 1422 return _regulator_get(dev, id, false, true); 1423} 1424EXPORT_SYMBOL_GPL(regulator_get); 1425 1426/** 1427 * regulator_get_exclusive - obtain exclusive access to a regulator. 1428 * @dev: device for regulator "consumer" 1429 * @id: Supply name or regulator ID. 1430 * 1431 * Returns a struct regulator corresponding to the regulator producer, 1432 * or IS_ERR() condition containing errno. Other consumers will be 1433 * unable to obtain this regulator while this reference is held and the 1434 * use count for the regulator will be initialised to reflect the current 1435 * state of the regulator. 1436 * 1437 * This is intended for use by consumers which cannot tolerate shared 1438 * use of the regulator such as those which need to force the 1439 * regulator off for correct operation of the hardware they are 1440 * controlling. 1441 * 1442 * Use of supply names configured via regulator_set_device_supply() is 1443 * strongly encouraged. It is recommended that the supply name used 1444 * should match the name used for the supply and/or the relevant 1445 * device pins in the datasheet. 1446 */ 1447struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1448{ 1449 return _regulator_get(dev, id, true, false); 1450} 1451EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1452 1453/** 1454 * regulator_get_optional - obtain optional access to a regulator. 1455 * @dev: device for regulator "consumer" 1456 * @id: Supply name or regulator ID. 1457 * 1458 * Returns a struct regulator corresponding to the regulator producer, 1459 * or IS_ERR() condition containing errno. 1460 * 1461 * This is intended for use by consumers for devices which can have 1462 * some supplies unconnected in normal use, such as some MMC devices. 1463 * It can allow the regulator core to provide stub supplies for other 1464 * supplies requested using normal regulator_get() calls without 1465 * disrupting the operation of drivers that can handle absent 1466 * supplies. 1467 * 1468 * Use of supply names configured via regulator_set_device_supply() is 1469 * strongly encouraged. It is recommended that the supply name used 1470 * should match the name used for the supply and/or the relevant 1471 * device pins in the datasheet. 1472 */ 1473struct regulator *regulator_get_optional(struct device *dev, const char *id) 1474{ 1475 return _regulator_get(dev, id, false, false); 1476} 1477EXPORT_SYMBOL_GPL(regulator_get_optional); 1478 1479/* Locks held by regulator_put() */ 1480static void _regulator_put(struct regulator *regulator) 1481{ 1482 struct regulator_dev *rdev; 1483 1484 if (regulator == NULL || IS_ERR(regulator)) 1485 return; 1486 1487 rdev = regulator->rdev; 1488 1489 debugfs_remove_recursive(regulator->debugfs); 1490 1491 /* remove any sysfs entries */ 1492 if (regulator->dev) 1493 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1494 kfree(regulator->supply_name); 1495 list_del(®ulator->list); 1496 kfree(regulator); 1497 1498 rdev->open_count--; 1499 rdev->exclusive = 0; 1500 1501 module_put(rdev->owner); 1502} 1503 1504/** 1505 * regulator_put - "free" the regulator source 1506 * @regulator: regulator source 1507 * 1508 * Note: drivers must ensure that all regulator_enable calls made on this 1509 * regulator source are balanced by regulator_disable calls prior to calling 1510 * this function. 1511 */ 1512void regulator_put(struct regulator *regulator) 1513{ 1514 mutex_lock(®ulator_list_mutex); 1515 _regulator_put(regulator); 1516 mutex_unlock(®ulator_list_mutex); 1517} 1518EXPORT_SYMBOL_GPL(regulator_put); 1519 1520/** 1521 * regulator_register_supply_alias - Provide device alias for supply lookup 1522 * 1523 * @dev: device that will be given as the regulator "consumer" 1524 * @id: Supply name or regulator ID 1525 * @alias_dev: device that should be used to lookup the supply 1526 * @alias_id: Supply name or regulator ID that should be used to lookup the 1527 * supply 1528 * 1529 * All lookups for id on dev will instead be conducted for alias_id on 1530 * alias_dev. 1531 */ 1532int regulator_register_supply_alias(struct device *dev, const char *id, 1533 struct device *alias_dev, 1534 const char *alias_id) 1535{ 1536 struct regulator_supply_alias *map; 1537 1538 map = regulator_find_supply_alias(dev, id); 1539 if (map) 1540 return -EEXIST; 1541 1542 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1543 if (!map) 1544 return -ENOMEM; 1545 1546 map->src_dev = dev; 1547 map->src_supply = id; 1548 map->alias_dev = alias_dev; 1549 map->alias_supply = alias_id; 1550 1551 list_add(&map->list, ®ulator_supply_alias_list); 1552 1553 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1554 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1555 1556 return 0; 1557} 1558EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1559 1560/** 1561 * regulator_unregister_supply_alias - Remove device alias 1562 * 1563 * @dev: device that will be given as the regulator "consumer" 1564 * @id: Supply name or regulator ID 1565 * 1566 * Remove a lookup alias if one exists for id on dev. 1567 */ 1568void regulator_unregister_supply_alias(struct device *dev, const char *id) 1569{ 1570 struct regulator_supply_alias *map; 1571 1572 map = regulator_find_supply_alias(dev, id); 1573 if (map) { 1574 list_del(&map->list); 1575 kfree(map); 1576 } 1577} 1578EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1579 1580/** 1581 * regulator_bulk_register_supply_alias - register multiple aliases 1582 * 1583 * @dev: device that will be given as the regulator "consumer" 1584 * @id: List of supply names or regulator IDs 1585 * @alias_dev: device that should be used to lookup the supply 1586 * @alias_id: List of supply names or regulator IDs that should be used to 1587 * lookup the supply 1588 * @num_id: Number of aliases to register 1589 * 1590 * @return 0 on success, an errno on failure. 1591 * 1592 * This helper function allows drivers to register several supply 1593 * aliases in one operation. If any of the aliases cannot be 1594 * registered any aliases that were registered will be removed 1595 * before returning to the caller. 1596 */ 1597int regulator_bulk_register_supply_alias(struct device *dev, 1598 const char *const *id, 1599 struct device *alias_dev, 1600 const char *const *alias_id, 1601 int num_id) 1602{ 1603 int i; 1604 int ret; 1605 1606 for (i = 0; i < num_id; ++i) { 1607 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1608 alias_id[i]); 1609 if (ret < 0) 1610 goto err; 1611 } 1612 1613 return 0; 1614 1615err: 1616 dev_err(dev, 1617 "Failed to create supply alias %s,%s -> %s,%s\n", 1618 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1619 1620 while (--i >= 0) 1621 regulator_unregister_supply_alias(dev, id[i]); 1622 1623 return ret; 1624} 1625EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1626 1627/** 1628 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1629 * 1630 * @dev: device that will be given as the regulator "consumer" 1631 * @id: List of supply names or regulator IDs 1632 * @num_id: Number of aliases to unregister 1633 * 1634 * This helper function allows drivers to unregister several supply 1635 * aliases in one operation. 1636 */ 1637void regulator_bulk_unregister_supply_alias(struct device *dev, 1638 const char *const *id, 1639 int num_id) 1640{ 1641 int i; 1642 1643 for (i = 0; i < num_id; ++i) 1644 regulator_unregister_supply_alias(dev, id[i]); 1645} 1646EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1647 1648 1649/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1650static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1651 const struct regulator_config *config) 1652{ 1653 struct regulator_enable_gpio *pin; 1654 int ret; 1655 1656 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1657 if (pin->gpio == config->ena_gpio) { 1658 rdev_dbg(rdev, "GPIO %d is already used\n", 1659 config->ena_gpio); 1660 goto update_ena_gpio_to_rdev; 1661 } 1662 } 1663 1664 ret = gpio_request_one(config->ena_gpio, 1665 GPIOF_DIR_OUT | config->ena_gpio_flags, 1666 rdev_get_name(rdev)); 1667 if (ret) 1668 return ret; 1669 1670 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1671 if (pin == NULL) { 1672 gpio_free(config->ena_gpio); 1673 return -ENOMEM; 1674 } 1675 1676 pin->gpio = config->ena_gpio; 1677 pin->ena_gpio_invert = config->ena_gpio_invert; 1678 list_add(&pin->list, ®ulator_ena_gpio_list); 1679 1680update_ena_gpio_to_rdev: 1681 pin->request_count++; 1682 rdev->ena_pin = pin; 1683 return 0; 1684} 1685 1686static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1687{ 1688 struct regulator_enable_gpio *pin, *n; 1689 1690 if (!rdev->ena_pin) 1691 return; 1692 1693 /* Free the GPIO only in case of no use */ 1694 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1695 if (pin->gpio == rdev->ena_pin->gpio) { 1696 if (pin->request_count <= 1) { 1697 pin->request_count = 0; 1698 gpio_free(pin->gpio); 1699 list_del(&pin->list); 1700 kfree(pin); 1701 } else { 1702 pin->request_count--; 1703 } 1704 } 1705 } 1706} 1707 1708/** 1709 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1710 * @rdev: regulator_dev structure 1711 * @enable: enable GPIO at initial use? 1712 * 1713 * GPIO is enabled in case of initial use. (enable_count is 0) 1714 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1715 */ 1716static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1717{ 1718 struct regulator_enable_gpio *pin = rdev->ena_pin; 1719 1720 if (!pin) 1721 return -EINVAL; 1722 1723 if (enable) { 1724 /* Enable GPIO at initial use */ 1725 if (pin->enable_count == 0) 1726 gpio_set_value_cansleep(pin->gpio, 1727 !pin->ena_gpio_invert); 1728 1729 pin->enable_count++; 1730 } else { 1731 if (pin->enable_count > 1) { 1732 pin->enable_count--; 1733 return 0; 1734 } 1735 1736 /* Disable GPIO if not used */ 1737 if (pin->enable_count <= 1) { 1738 gpio_set_value_cansleep(pin->gpio, 1739 pin->ena_gpio_invert); 1740 pin->enable_count = 0; 1741 } 1742 } 1743 1744 return 0; 1745} 1746 1747static int _regulator_do_enable(struct regulator_dev *rdev) 1748{ 1749 int ret, delay; 1750 1751 /* Query before enabling in case configuration dependent. */ 1752 ret = _regulator_get_enable_time(rdev); 1753 if (ret >= 0) { 1754 delay = ret; 1755 } else { 1756 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1757 delay = 0; 1758 } 1759 1760 trace_regulator_enable(rdev_get_name(rdev)); 1761 1762 if (rdev->ena_pin) { 1763 ret = regulator_ena_gpio_ctrl(rdev, true); 1764 if (ret < 0) 1765 return ret; 1766 rdev->ena_gpio_state = 1; 1767 } else if (rdev->desc->ops->enable) { 1768 ret = rdev->desc->ops->enable(rdev); 1769 if (ret < 0) 1770 return ret; 1771 } else { 1772 return -EINVAL; 1773 } 1774 1775 /* Allow the regulator to ramp; it would be useful to extend 1776 * this for bulk operations so that the regulators can ramp 1777 * together. */ 1778 trace_regulator_enable_delay(rdev_get_name(rdev)); 1779 1780 /* 1781 * Delay for the requested amount of time as per the guidelines in: 1782 * 1783 * Documentation/timers/timers-howto.txt 1784 * 1785 * The assumption here is that regulators will never be enabled in 1786 * atomic context and therefore sleeping functions can be used. 1787 */ 1788 if (delay) { 1789 unsigned int ms = delay / 1000; 1790 unsigned int us = delay % 1000; 1791 1792 if (ms > 0) { 1793 /* 1794 * For small enough values, handle super-millisecond 1795 * delays in the usleep_range() call below. 1796 */ 1797 if (ms < 20) 1798 us += ms * 1000; 1799 else 1800 msleep(ms); 1801 } 1802 1803 /* 1804 * Give the scheduler some room to coalesce with any other 1805 * wakeup sources. For delays shorter than 10 us, don't even 1806 * bother setting up high-resolution timers and just busy- 1807 * loop. 1808 */ 1809 if (us >= 10) 1810 usleep_range(us, us + 100); 1811 else 1812 udelay(us); 1813 } 1814 1815 trace_regulator_enable_complete(rdev_get_name(rdev)); 1816 1817 return 0; 1818} 1819 1820/* locks held by regulator_enable() */ 1821static int _regulator_enable(struct regulator_dev *rdev) 1822{ 1823 int ret; 1824 1825 /* check voltage and requested load before enabling */ 1826 if (rdev->constraints && 1827 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1828 drms_uA_update(rdev); 1829 1830 if (rdev->use_count == 0) { 1831 /* The regulator may on if it's not switchable or left on */ 1832 ret = _regulator_is_enabled(rdev); 1833 if (ret == -EINVAL || ret == 0) { 1834 if (!_regulator_can_change_status(rdev)) 1835 return -EPERM; 1836 1837 ret = _regulator_do_enable(rdev); 1838 if (ret < 0) 1839 return ret; 1840 1841 } else if (ret < 0) { 1842 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1843 return ret; 1844 } 1845 /* Fallthrough on positive return values - already enabled */ 1846 } 1847 1848 rdev->use_count++; 1849 1850 return 0; 1851} 1852 1853/** 1854 * regulator_enable - enable regulator output 1855 * @regulator: regulator source 1856 * 1857 * Request that the regulator be enabled with the regulator output at 1858 * the predefined voltage or current value. Calls to regulator_enable() 1859 * must be balanced with calls to regulator_disable(). 1860 * 1861 * NOTE: the output value can be set by other drivers, boot loader or may be 1862 * hardwired in the regulator. 1863 */ 1864int regulator_enable(struct regulator *regulator) 1865{ 1866 struct regulator_dev *rdev = regulator->rdev; 1867 int ret = 0; 1868 1869 if (regulator->always_on) 1870 return 0; 1871 1872 if (rdev->supply) { 1873 ret = regulator_enable(rdev->supply); 1874 if (ret != 0) 1875 return ret; 1876 } 1877 1878 mutex_lock(&rdev->mutex); 1879 ret = _regulator_enable(rdev); 1880 mutex_unlock(&rdev->mutex); 1881 1882 if (ret != 0 && rdev->supply) 1883 regulator_disable(rdev->supply); 1884 1885 return ret; 1886} 1887EXPORT_SYMBOL_GPL(regulator_enable); 1888 1889static int _regulator_do_disable(struct regulator_dev *rdev) 1890{ 1891 int ret; 1892 1893 trace_regulator_disable(rdev_get_name(rdev)); 1894 1895 if (rdev->ena_pin) { 1896 ret = regulator_ena_gpio_ctrl(rdev, false); 1897 if (ret < 0) 1898 return ret; 1899 rdev->ena_gpio_state = 0; 1900 1901 } else if (rdev->desc->ops->disable) { 1902 ret = rdev->desc->ops->disable(rdev); 1903 if (ret != 0) 1904 return ret; 1905 } 1906 1907 trace_regulator_disable_complete(rdev_get_name(rdev)); 1908 1909 return 0; 1910} 1911 1912/* locks held by regulator_disable() */ 1913static int _regulator_disable(struct regulator_dev *rdev) 1914{ 1915 int ret = 0; 1916 1917 if (WARN(rdev->use_count <= 0, 1918 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1919 return -EIO; 1920 1921 /* are we the last user and permitted to disable ? */ 1922 if (rdev->use_count == 1 && 1923 (rdev->constraints && !rdev->constraints->always_on)) { 1924 1925 /* we are last user */ 1926 if (_regulator_can_change_status(rdev)) { 1927 ret = _regulator_do_disable(rdev); 1928 if (ret < 0) { 1929 rdev_err(rdev, "failed to disable\n"); 1930 return ret; 1931 } 1932 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1933 NULL); 1934 } 1935 1936 rdev->use_count = 0; 1937 } else if (rdev->use_count > 1) { 1938 1939 if (rdev->constraints && 1940 (rdev->constraints->valid_ops_mask & 1941 REGULATOR_CHANGE_DRMS)) 1942 drms_uA_update(rdev); 1943 1944 rdev->use_count--; 1945 } 1946 1947 return ret; 1948} 1949 1950/** 1951 * regulator_disable - disable regulator output 1952 * @regulator: regulator source 1953 * 1954 * Disable the regulator output voltage or current. Calls to 1955 * regulator_enable() must be balanced with calls to 1956 * regulator_disable(). 1957 * 1958 * NOTE: this will only disable the regulator output if no other consumer 1959 * devices have it enabled, the regulator device supports disabling and 1960 * machine constraints permit this operation. 1961 */ 1962int regulator_disable(struct regulator *regulator) 1963{ 1964 struct regulator_dev *rdev = regulator->rdev; 1965 int ret = 0; 1966 1967 if (regulator->always_on) 1968 return 0; 1969 1970 mutex_lock(&rdev->mutex); 1971 ret = _regulator_disable(rdev); 1972 mutex_unlock(&rdev->mutex); 1973 1974 if (ret == 0 && rdev->supply) 1975 regulator_disable(rdev->supply); 1976 1977 return ret; 1978} 1979EXPORT_SYMBOL_GPL(regulator_disable); 1980 1981/* locks held by regulator_force_disable() */ 1982static int _regulator_force_disable(struct regulator_dev *rdev) 1983{ 1984 int ret = 0; 1985 1986 ret = _regulator_do_disable(rdev); 1987 if (ret < 0) { 1988 rdev_err(rdev, "failed to force disable\n"); 1989 return ret; 1990 } 1991 1992 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1993 REGULATOR_EVENT_DISABLE, NULL); 1994 1995 return 0; 1996} 1997 1998/** 1999 * regulator_force_disable - force disable regulator output 2000 * @regulator: regulator source 2001 * 2002 * Forcibly disable the regulator output voltage or current. 2003 * NOTE: this *will* disable the regulator output even if other consumer 2004 * devices have it enabled. This should be used for situations when device 2005 * damage will likely occur if the regulator is not disabled (e.g. over temp). 2006 */ 2007int regulator_force_disable(struct regulator *regulator) 2008{ 2009 struct regulator_dev *rdev = regulator->rdev; 2010 int ret; 2011 2012 mutex_lock(&rdev->mutex); 2013 regulator->uA_load = 0; 2014 ret = _regulator_force_disable(regulator->rdev); 2015 mutex_unlock(&rdev->mutex); 2016 2017 if (rdev->supply) 2018 while (rdev->open_count--) 2019 regulator_disable(rdev->supply); 2020 2021 return ret; 2022} 2023EXPORT_SYMBOL_GPL(regulator_force_disable); 2024 2025static void regulator_disable_work(struct work_struct *work) 2026{ 2027 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 2028 disable_work.work); 2029 int count, i, ret; 2030 2031 mutex_lock(&rdev->mutex); 2032 2033 BUG_ON(!rdev->deferred_disables); 2034 2035 count = rdev->deferred_disables; 2036 rdev->deferred_disables = 0; 2037 2038 for (i = 0; i < count; i++) { 2039 ret = _regulator_disable(rdev); 2040 if (ret != 0) 2041 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 2042 } 2043 2044 mutex_unlock(&rdev->mutex); 2045 2046 if (rdev->supply) { 2047 for (i = 0; i < count; i++) { 2048 ret = regulator_disable(rdev->supply); 2049 if (ret != 0) { 2050 rdev_err(rdev, 2051 "Supply disable failed: %d\n", ret); 2052 } 2053 } 2054 } 2055} 2056 2057/** 2058 * regulator_disable_deferred - disable regulator output with delay 2059 * @regulator: regulator source 2060 * @ms: miliseconds until the regulator is disabled 2061 * 2062 * Execute regulator_disable() on the regulator after a delay. This 2063 * is intended for use with devices that require some time to quiesce. 2064 * 2065 * NOTE: this will only disable the regulator output if no other consumer 2066 * devices have it enabled, the regulator device supports disabling and 2067 * machine constraints permit this operation. 2068 */ 2069int regulator_disable_deferred(struct regulator *regulator, int ms) 2070{ 2071 struct regulator_dev *rdev = regulator->rdev; 2072 int ret; 2073 2074 if (regulator->always_on) 2075 return 0; 2076 2077 if (!ms) 2078 return regulator_disable(regulator); 2079 2080 mutex_lock(&rdev->mutex); 2081 rdev->deferred_disables++; 2082 mutex_unlock(&rdev->mutex); 2083 2084 ret = queue_delayed_work(system_power_efficient_wq, 2085 &rdev->disable_work, 2086 msecs_to_jiffies(ms)); 2087 if (ret < 0) 2088 return ret; 2089 else 2090 return 0; 2091} 2092EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2093 2094static int _regulator_is_enabled(struct regulator_dev *rdev) 2095{ 2096 /* A GPIO control always takes precedence */ 2097 if (rdev->ena_pin) 2098 return rdev->ena_gpio_state; 2099 2100 /* If we don't know then assume that the regulator is always on */ 2101 if (!rdev->desc->ops->is_enabled) 2102 return 1; 2103 2104 return rdev->desc->ops->is_enabled(rdev); 2105} 2106 2107/** 2108 * regulator_is_enabled - is the regulator output enabled 2109 * @regulator: regulator source 2110 * 2111 * Returns positive if the regulator driver backing the source/client 2112 * has requested that the device be enabled, zero if it hasn't, else a 2113 * negative errno code. 2114 * 2115 * Note that the device backing this regulator handle can have multiple 2116 * users, so it might be enabled even if regulator_enable() was never 2117 * called for this particular source. 2118 */ 2119int regulator_is_enabled(struct regulator *regulator) 2120{ 2121 int ret; 2122 2123 if (regulator->always_on) 2124 return 1; 2125 2126 mutex_lock(®ulator->rdev->mutex); 2127 ret = _regulator_is_enabled(regulator->rdev); 2128 mutex_unlock(®ulator->rdev->mutex); 2129 2130 return ret; 2131} 2132EXPORT_SYMBOL_GPL(regulator_is_enabled); 2133 2134/** 2135 * regulator_can_change_voltage - check if regulator can change voltage 2136 * @regulator: regulator source 2137 * 2138 * Returns positive if the regulator driver backing the source/client 2139 * can change its voltage, false otherwise. Useful for detecting fixed 2140 * or dummy regulators and disabling voltage change logic in the client 2141 * driver. 2142 */ 2143int regulator_can_change_voltage(struct regulator *regulator) 2144{ 2145 struct regulator_dev *rdev = regulator->rdev; 2146 2147 if (rdev->constraints && 2148 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2149 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2150 return 1; 2151 2152 if (rdev->desc->continuous_voltage_range && 2153 rdev->constraints->min_uV && rdev->constraints->max_uV && 2154 rdev->constraints->min_uV != rdev->constraints->max_uV) 2155 return 1; 2156 } 2157 2158 return 0; 2159} 2160EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2161 2162/** 2163 * regulator_count_voltages - count regulator_list_voltage() selectors 2164 * @regulator: regulator source 2165 * 2166 * Returns number of selectors, or negative errno. Selectors are 2167 * numbered starting at zero, and typically correspond to bitfields 2168 * in hardware registers. 2169 */ 2170int regulator_count_voltages(struct regulator *regulator) 2171{ 2172 struct regulator_dev *rdev = regulator->rdev; 2173 2174 return rdev->desc->n_voltages ? : -EINVAL; 2175} 2176EXPORT_SYMBOL_GPL(regulator_count_voltages); 2177 2178/** 2179 * regulator_list_voltage - enumerate supported voltages 2180 * @regulator: regulator source 2181 * @selector: identify voltage to list 2182 * Context: can sleep 2183 * 2184 * Returns a voltage that can be passed to @regulator_set_voltage(), 2185 * zero if this selector code can't be used on this system, or a 2186 * negative errno. 2187 */ 2188int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2189{ 2190 struct regulator_dev *rdev = regulator->rdev; 2191 struct regulator_ops *ops = rdev->desc->ops; 2192 int ret; 2193 2194 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) 2195 return rdev->desc->fixed_uV; 2196 2197 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2198 return -EINVAL; 2199 2200 mutex_lock(&rdev->mutex); 2201 ret = ops->list_voltage(rdev, selector); 2202 mutex_unlock(&rdev->mutex); 2203 2204 if (ret > 0) { 2205 if (ret < rdev->constraints->min_uV) 2206 ret = 0; 2207 else if (ret > rdev->constraints->max_uV) 2208 ret = 0; 2209 } 2210 2211 return ret; 2212} 2213EXPORT_SYMBOL_GPL(regulator_list_voltage); 2214 2215/** 2216 * regulator_get_linear_step - return the voltage step size between VSEL values 2217 * @regulator: regulator source 2218 * 2219 * Returns the voltage step size between VSEL values for linear 2220 * regulators, or return 0 if the regulator isn't a linear regulator. 2221 */ 2222unsigned int regulator_get_linear_step(struct regulator *regulator) 2223{ 2224 struct regulator_dev *rdev = regulator->rdev; 2225 2226 return rdev->desc->uV_step; 2227} 2228EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2229 2230/** 2231 * regulator_is_supported_voltage - check if a voltage range can be supported 2232 * 2233 * @regulator: Regulator to check. 2234 * @min_uV: Minimum required voltage in uV. 2235 * @max_uV: Maximum required voltage in uV. 2236 * 2237 * Returns a boolean or a negative error code. 2238 */ 2239int regulator_is_supported_voltage(struct regulator *regulator, 2240 int min_uV, int max_uV) 2241{ 2242 struct regulator_dev *rdev = regulator->rdev; 2243 int i, voltages, ret; 2244 2245 /* If we can't change voltage check the current voltage */ 2246 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2247 ret = regulator_get_voltage(regulator); 2248 if (ret >= 0) 2249 return min_uV <= ret && ret <= max_uV; 2250 else 2251 return ret; 2252 } 2253 2254 /* Any voltage within constrains range is fine? */ 2255 if (rdev->desc->continuous_voltage_range) 2256 return min_uV >= rdev->constraints->min_uV && 2257 max_uV <= rdev->constraints->max_uV; 2258 2259 ret = regulator_count_voltages(regulator); 2260 if (ret < 0) 2261 return ret; 2262 voltages = ret; 2263 2264 for (i = 0; i < voltages; i++) { 2265 ret = regulator_list_voltage(regulator, i); 2266 2267 if (ret >= min_uV && ret <= max_uV) 2268 return 1; 2269 } 2270 2271 return 0; 2272} 2273EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2274 2275static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2276 int min_uV, int max_uV) 2277{ 2278 int ret; 2279 int delay = 0; 2280 int best_val = 0; 2281 unsigned int selector; 2282 int old_selector = -1; 2283 2284 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2285 2286 min_uV += rdev->constraints->uV_offset; 2287 max_uV += rdev->constraints->uV_offset; 2288 2289 /* 2290 * If we can't obtain the old selector there is not enough 2291 * info to call set_voltage_time_sel(). 2292 */ 2293 if (_regulator_is_enabled(rdev) && 2294 rdev->desc->ops->set_voltage_time_sel && 2295 rdev->desc->ops->get_voltage_sel) { 2296 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2297 if (old_selector < 0) 2298 return old_selector; 2299 } 2300 2301 if (rdev->desc->ops->set_voltage) { 2302 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2303 &selector); 2304 2305 if (ret >= 0) { 2306 if (rdev->desc->ops->list_voltage) 2307 best_val = rdev->desc->ops->list_voltage(rdev, 2308 selector); 2309 else 2310 best_val = _regulator_get_voltage(rdev); 2311 } 2312 2313 } else if (rdev->desc->ops->set_voltage_sel) { 2314 if (rdev->desc->ops->map_voltage) { 2315 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2316 max_uV); 2317 } else { 2318 if (rdev->desc->ops->list_voltage == 2319 regulator_list_voltage_linear) 2320 ret = regulator_map_voltage_linear(rdev, 2321 min_uV, max_uV); 2322 else if (rdev->desc->ops->list_voltage == 2323 regulator_list_voltage_linear_range) 2324 ret = regulator_map_voltage_linear_range(rdev, 2325 min_uV, max_uV); 2326 else 2327 ret = regulator_map_voltage_iterate(rdev, 2328 min_uV, max_uV); 2329 } 2330 2331 if (ret >= 0) { 2332 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2333 if (min_uV <= best_val && max_uV >= best_val) { 2334 selector = ret; 2335 if (old_selector == selector) 2336 ret = 0; 2337 else 2338 ret = rdev->desc->ops->set_voltage_sel( 2339 rdev, ret); 2340 } else { 2341 ret = -EINVAL; 2342 } 2343 } 2344 } else { 2345 ret = -EINVAL; 2346 } 2347 2348 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2349 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2350 && old_selector != selector) { 2351 2352 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2353 old_selector, selector); 2354 if (delay < 0) { 2355 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2356 delay); 2357 delay = 0; 2358 } 2359 2360 /* Insert any necessary delays */ 2361 if (delay >= 1000) { 2362 mdelay(delay / 1000); 2363 udelay(delay % 1000); 2364 } else if (delay) { 2365 udelay(delay); 2366 } 2367 } 2368 2369 if (ret == 0 && best_val >= 0) { 2370 unsigned long data = best_val; 2371 2372 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2373 (void *)data); 2374 } 2375 2376 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2377 2378 return ret; 2379} 2380 2381/** 2382 * regulator_set_voltage - set regulator output voltage 2383 * @regulator: regulator source 2384 * @min_uV: Minimum required voltage in uV 2385 * @max_uV: Maximum acceptable voltage in uV 2386 * 2387 * Sets a voltage regulator to the desired output voltage. This can be set 2388 * during any regulator state. IOW, regulator can be disabled or enabled. 2389 * 2390 * If the regulator is enabled then the voltage will change to the new value 2391 * immediately otherwise if the regulator is disabled the regulator will 2392 * output at the new voltage when enabled. 2393 * 2394 * NOTE: If the regulator is shared between several devices then the lowest 2395 * request voltage that meets the system constraints will be used. 2396 * Regulator system constraints must be set for this regulator before 2397 * calling this function otherwise this call will fail. 2398 */ 2399int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2400{ 2401 struct regulator_dev *rdev = regulator->rdev; 2402 int ret = 0; 2403 int old_min_uV, old_max_uV; 2404 int current_uV; 2405 2406 mutex_lock(&rdev->mutex); 2407 2408 /* If we're setting the same range as last time the change 2409 * should be a noop (some cpufreq implementations use the same 2410 * voltage for multiple frequencies, for example). 2411 */ 2412 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2413 goto out; 2414 2415 /* If we're trying to set a range that overlaps the current voltage, 2416 * return succesfully even though the regulator does not support 2417 * changing the voltage. 2418 */ 2419 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2420 current_uV = _regulator_get_voltage(rdev); 2421 if (min_uV <= current_uV && current_uV <= max_uV) { 2422 regulator->min_uV = min_uV; 2423 regulator->max_uV = max_uV; 2424 goto out; 2425 } 2426 } 2427 2428 /* sanity check */ 2429 if (!rdev->desc->ops->set_voltage && 2430 !rdev->desc->ops->set_voltage_sel) { 2431 ret = -EINVAL; 2432 goto out; 2433 } 2434 2435 /* constraints check */ 2436 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2437 if (ret < 0) 2438 goto out; 2439 2440 /* restore original values in case of error */ 2441 old_min_uV = regulator->min_uV; 2442 old_max_uV = regulator->max_uV; 2443 regulator->min_uV = min_uV; 2444 regulator->max_uV = max_uV; 2445 2446 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2447 if (ret < 0) 2448 goto out2; 2449 2450 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2451 if (ret < 0) 2452 goto out2; 2453 2454out: 2455 mutex_unlock(&rdev->mutex); 2456 return ret; 2457out2: 2458 regulator->min_uV = old_min_uV; 2459 regulator->max_uV = old_max_uV; 2460 mutex_unlock(&rdev->mutex); 2461 return ret; 2462} 2463EXPORT_SYMBOL_GPL(regulator_set_voltage); 2464 2465/** 2466 * regulator_set_voltage_time - get raise/fall time 2467 * @regulator: regulator source 2468 * @old_uV: starting voltage in microvolts 2469 * @new_uV: target voltage in microvolts 2470 * 2471 * Provided with the starting and ending voltage, this function attempts to 2472 * calculate the time in microseconds required to rise or fall to this new 2473 * voltage. 2474 */ 2475int regulator_set_voltage_time(struct regulator *regulator, 2476 int old_uV, int new_uV) 2477{ 2478 struct regulator_dev *rdev = regulator->rdev; 2479 struct regulator_ops *ops = rdev->desc->ops; 2480 int old_sel = -1; 2481 int new_sel = -1; 2482 int voltage; 2483 int i; 2484 2485 /* Currently requires operations to do this */ 2486 if (!ops->list_voltage || !ops->set_voltage_time_sel 2487 || !rdev->desc->n_voltages) 2488 return -EINVAL; 2489 2490 for (i = 0; i < rdev->desc->n_voltages; i++) { 2491 /* We only look for exact voltage matches here */ 2492 voltage = regulator_list_voltage(regulator, i); 2493 if (voltage < 0) 2494 return -EINVAL; 2495 if (voltage == 0) 2496 continue; 2497 if (voltage == old_uV) 2498 old_sel = i; 2499 if (voltage == new_uV) 2500 new_sel = i; 2501 } 2502 2503 if (old_sel < 0 || new_sel < 0) 2504 return -EINVAL; 2505 2506 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2507} 2508EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2509 2510/** 2511 * regulator_set_voltage_time_sel - get raise/fall time 2512 * @rdev: regulator source device 2513 * @old_selector: selector for starting voltage 2514 * @new_selector: selector for target voltage 2515 * 2516 * Provided with the starting and target voltage selectors, this function 2517 * returns time in microseconds required to rise or fall to this new voltage 2518 * 2519 * Drivers providing ramp_delay in regulation_constraints can use this as their 2520 * set_voltage_time_sel() operation. 2521 */ 2522int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2523 unsigned int old_selector, 2524 unsigned int new_selector) 2525{ 2526 unsigned int ramp_delay = 0; 2527 int old_volt, new_volt; 2528 2529 if (rdev->constraints->ramp_delay) 2530 ramp_delay = rdev->constraints->ramp_delay; 2531 else if (rdev->desc->ramp_delay) 2532 ramp_delay = rdev->desc->ramp_delay; 2533 2534 if (ramp_delay == 0) { 2535 rdev_warn(rdev, "ramp_delay not set\n"); 2536 return 0; 2537 } 2538 2539 /* sanity check */ 2540 if (!rdev->desc->ops->list_voltage) 2541 return -EINVAL; 2542 2543 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2544 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2545 2546 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2547} 2548EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2549 2550/** 2551 * regulator_sync_voltage - re-apply last regulator output voltage 2552 * @regulator: regulator source 2553 * 2554 * Re-apply the last configured voltage. This is intended to be used 2555 * where some external control source the consumer is cooperating with 2556 * has caused the configured voltage to change. 2557 */ 2558int regulator_sync_voltage(struct regulator *regulator) 2559{ 2560 struct regulator_dev *rdev = regulator->rdev; 2561 int ret, min_uV, max_uV; 2562 2563 mutex_lock(&rdev->mutex); 2564 2565 if (!rdev->desc->ops->set_voltage && 2566 !rdev->desc->ops->set_voltage_sel) { 2567 ret = -EINVAL; 2568 goto out; 2569 } 2570 2571 /* This is only going to work if we've had a voltage configured. */ 2572 if (!regulator->min_uV && !regulator->max_uV) { 2573 ret = -EINVAL; 2574 goto out; 2575 } 2576 2577 min_uV = regulator->min_uV; 2578 max_uV = regulator->max_uV; 2579 2580 /* This should be a paranoia check... */ 2581 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2582 if (ret < 0) 2583 goto out; 2584 2585 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2586 if (ret < 0) 2587 goto out; 2588 2589 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2590 2591out: 2592 mutex_unlock(&rdev->mutex); 2593 return ret; 2594} 2595EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2596 2597static int _regulator_get_voltage(struct regulator_dev *rdev) 2598{ 2599 int sel, ret; 2600 2601 if (rdev->desc->ops->get_voltage_sel) { 2602 sel = rdev->desc->ops->get_voltage_sel(rdev); 2603 if (sel < 0) 2604 return sel; 2605 ret = rdev->desc->ops->list_voltage(rdev, sel); 2606 } else if (rdev->desc->ops->get_voltage) { 2607 ret = rdev->desc->ops->get_voltage(rdev); 2608 } else if (rdev->desc->ops->list_voltage) { 2609 ret = rdev->desc->ops->list_voltage(rdev, 0); 2610 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { 2611 ret = rdev->desc->fixed_uV; 2612 } else { 2613 return -EINVAL; 2614 } 2615 2616 if (ret < 0) 2617 return ret; 2618 return ret - rdev->constraints->uV_offset; 2619} 2620 2621/** 2622 * regulator_get_voltage - get regulator output voltage 2623 * @regulator: regulator source 2624 * 2625 * This returns the current regulator voltage in uV. 2626 * 2627 * NOTE: If the regulator is disabled it will return the voltage value. This 2628 * function should not be used to determine regulator state. 2629 */ 2630int regulator_get_voltage(struct regulator *regulator) 2631{ 2632 int ret; 2633 2634 mutex_lock(®ulator->rdev->mutex); 2635 2636 ret = _regulator_get_voltage(regulator->rdev); 2637 2638 mutex_unlock(®ulator->rdev->mutex); 2639 2640 return ret; 2641} 2642EXPORT_SYMBOL_GPL(regulator_get_voltage); 2643 2644/** 2645 * regulator_set_current_limit - set regulator output current limit 2646 * @regulator: regulator source 2647 * @min_uA: Minimum supported current in uA 2648 * @max_uA: Maximum supported current in uA 2649 * 2650 * Sets current sink to the desired output current. This can be set during 2651 * any regulator state. IOW, regulator can be disabled or enabled. 2652 * 2653 * If the regulator is enabled then the current will change to the new value 2654 * immediately otherwise if the regulator is disabled the regulator will 2655 * output at the new current when enabled. 2656 * 2657 * NOTE: Regulator system constraints must be set for this regulator before 2658 * calling this function otherwise this call will fail. 2659 */ 2660int regulator_set_current_limit(struct regulator *regulator, 2661 int min_uA, int max_uA) 2662{ 2663 struct regulator_dev *rdev = regulator->rdev; 2664 int ret; 2665 2666 mutex_lock(&rdev->mutex); 2667 2668 /* sanity check */ 2669 if (!rdev->desc->ops->set_current_limit) { 2670 ret = -EINVAL; 2671 goto out; 2672 } 2673 2674 /* constraints check */ 2675 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2676 if (ret < 0) 2677 goto out; 2678 2679 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2680out: 2681 mutex_unlock(&rdev->mutex); 2682 return ret; 2683} 2684EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2685 2686static int _regulator_get_current_limit(struct regulator_dev *rdev) 2687{ 2688 int ret; 2689 2690 mutex_lock(&rdev->mutex); 2691 2692 /* sanity check */ 2693 if (!rdev->desc->ops->get_current_limit) { 2694 ret = -EINVAL; 2695 goto out; 2696 } 2697 2698 ret = rdev->desc->ops->get_current_limit(rdev); 2699out: 2700 mutex_unlock(&rdev->mutex); 2701 return ret; 2702} 2703 2704/** 2705 * regulator_get_current_limit - get regulator output current 2706 * @regulator: regulator source 2707 * 2708 * This returns the current supplied by the specified current sink in uA. 2709 * 2710 * NOTE: If the regulator is disabled it will return the current value. This 2711 * function should not be used to determine regulator state. 2712 */ 2713int regulator_get_current_limit(struct regulator *regulator) 2714{ 2715 return _regulator_get_current_limit(regulator->rdev); 2716} 2717EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2718 2719/** 2720 * regulator_set_mode - set regulator operating mode 2721 * @regulator: regulator source 2722 * @mode: operating mode - one of the REGULATOR_MODE constants 2723 * 2724 * Set regulator operating mode to increase regulator efficiency or improve 2725 * regulation performance. 2726 * 2727 * NOTE: Regulator system constraints must be set for this regulator before 2728 * calling this function otherwise this call will fail. 2729 */ 2730int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2731{ 2732 struct regulator_dev *rdev = regulator->rdev; 2733 int ret; 2734 int regulator_curr_mode; 2735 2736 mutex_lock(&rdev->mutex); 2737 2738 /* sanity check */ 2739 if (!rdev->desc->ops->set_mode) { 2740 ret = -EINVAL; 2741 goto out; 2742 } 2743 2744 /* return if the same mode is requested */ 2745 if (rdev->desc->ops->get_mode) { 2746 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2747 if (regulator_curr_mode == mode) { 2748 ret = 0; 2749 goto out; 2750 } 2751 } 2752 2753 /* constraints check */ 2754 ret = regulator_mode_constrain(rdev, &mode); 2755 if (ret < 0) 2756 goto out; 2757 2758 ret = rdev->desc->ops->set_mode(rdev, mode); 2759out: 2760 mutex_unlock(&rdev->mutex); 2761 return ret; 2762} 2763EXPORT_SYMBOL_GPL(regulator_set_mode); 2764 2765static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2766{ 2767 int ret; 2768 2769 mutex_lock(&rdev->mutex); 2770 2771 /* sanity check */ 2772 if (!rdev->desc->ops->get_mode) { 2773 ret = -EINVAL; 2774 goto out; 2775 } 2776 2777 ret = rdev->desc->ops->get_mode(rdev); 2778out: 2779 mutex_unlock(&rdev->mutex); 2780 return ret; 2781} 2782 2783/** 2784 * regulator_get_mode - get regulator operating mode 2785 * @regulator: regulator source 2786 * 2787 * Get the current regulator operating mode. 2788 */ 2789unsigned int regulator_get_mode(struct regulator *regulator) 2790{ 2791 return _regulator_get_mode(regulator->rdev); 2792} 2793EXPORT_SYMBOL_GPL(regulator_get_mode); 2794 2795/** 2796 * regulator_set_optimum_mode - set regulator optimum operating mode 2797 * @regulator: regulator source 2798 * @uA_load: load current 2799 * 2800 * Notifies the regulator core of a new device load. This is then used by 2801 * DRMS (if enabled by constraints) to set the most efficient regulator 2802 * operating mode for the new regulator loading. 2803 * 2804 * Consumer devices notify their supply regulator of the maximum power 2805 * they will require (can be taken from device datasheet in the power 2806 * consumption tables) when they change operational status and hence power 2807 * state. Examples of operational state changes that can affect power 2808 * consumption are :- 2809 * 2810 * o Device is opened / closed. 2811 * o Device I/O is about to begin or has just finished. 2812 * o Device is idling in between work. 2813 * 2814 * This information is also exported via sysfs to userspace. 2815 * 2816 * DRMS will sum the total requested load on the regulator and change 2817 * to the most efficient operating mode if platform constraints allow. 2818 * 2819 * Returns the new regulator mode or error. 2820 */ 2821int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2822{ 2823 struct regulator_dev *rdev = regulator->rdev; 2824 struct regulator *consumer; 2825 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2826 unsigned int mode; 2827 2828 if (rdev->supply) 2829 input_uV = regulator_get_voltage(rdev->supply); 2830 2831 mutex_lock(&rdev->mutex); 2832 2833 /* 2834 * first check to see if we can set modes at all, otherwise just 2835 * tell the consumer everything is OK. 2836 */ 2837 regulator->uA_load = uA_load; 2838 ret = regulator_check_drms(rdev); 2839 if (ret < 0) { 2840 ret = 0; 2841 goto out; 2842 } 2843 2844 if (!rdev->desc->ops->get_optimum_mode) 2845 goto out; 2846 2847 /* 2848 * we can actually do this so any errors are indicators of 2849 * potential real failure. 2850 */ 2851 ret = -EINVAL; 2852 2853 if (!rdev->desc->ops->set_mode) 2854 goto out; 2855 2856 /* get output voltage */ 2857 output_uV = _regulator_get_voltage(rdev); 2858 if (output_uV <= 0) { 2859 rdev_err(rdev, "invalid output voltage found\n"); 2860 goto out; 2861 } 2862 2863 /* No supply? Use constraint voltage */ 2864 if (input_uV <= 0) 2865 input_uV = rdev->constraints->input_uV; 2866 if (input_uV <= 0) { 2867 rdev_err(rdev, "invalid input voltage found\n"); 2868 goto out; 2869 } 2870 2871 /* calc total requested load for this regulator */ 2872 list_for_each_entry(consumer, &rdev->consumer_list, list) 2873 total_uA_load += consumer->uA_load; 2874 2875 mode = rdev->desc->ops->get_optimum_mode(rdev, 2876 input_uV, output_uV, 2877 total_uA_load); 2878 ret = regulator_mode_constrain(rdev, &mode); 2879 if (ret < 0) { 2880 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2881 total_uA_load, input_uV, output_uV); 2882 goto out; 2883 } 2884 2885 ret = rdev->desc->ops->set_mode(rdev, mode); 2886 if (ret < 0) { 2887 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2888 goto out; 2889 } 2890 ret = mode; 2891out: 2892 mutex_unlock(&rdev->mutex); 2893 return ret; 2894} 2895EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2896 2897/** 2898 * regulator_allow_bypass - allow the regulator to go into bypass mode 2899 * 2900 * @regulator: Regulator to configure 2901 * @enable: enable or disable bypass mode 2902 * 2903 * Allow the regulator to go into bypass mode if all other consumers 2904 * for the regulator also enable bypass mode and the machine 2905 * constraints allow this. Bypass mode means that the regulator is 2906 * simply passing the input directly to the output with no regulation. 2907 */ 2908int regulator_allow_bypass(struct regulator *regulator, bool enable) 2909{ 2910 struct regulator_dev *rdev = regulator->rdev; 2911 int ret = 0; 2912 2913 if (!rdev->desc->ops->set_bypass) 2914 return 0; 2915 2916 if (rdev->constraints && 2917 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2918 return 0; 2919 2920 mutex_lock(&rdev->mutex); 2921 2922 if (enable && !regulator->bypass) { 2923 rdev->bypass_count++; 2924 2925 if (rdev->bypass_count == rdev->open_count) { 2926 ret = rdev->desc->ops->set_bypass(rdev, enable); 2927 if (ret != 0) 2928 rdev->bypass_count--; 2929 } 2930 2931 } else if (!enable && regulator->bypass) { 2932 rdev->bypass_count--; 2933 2934 if (rdev->bypass_count != rdev->open_count) { 2935 ret = rdev->desc->ops->set_bypass(rdev, enable); 2936 if (ret != 0) 2937 rdev->bypass_count++; 2938 } 2939 } 2940 2941 if (ret == 0) 2942 regulator->bypass = enable; 2943 2944 mutex_unlock(&rdev->mutex); 2945 2946 return ret; 2947} 2948EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2949 2950/** 2951 * regulator_register_notifier - register regulator event notifier 2952 * @regulator: regulator source 2953 * @nb: notifier block 2954 * 2955 * Register notifier block to receive regulator events. 2956 */ 2957int regulator_register_notifier(struct regulator *regulator, 2958 struct notifier_block *nb) 2959{ 2960 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2961 nb); 2962} 2963EXPORT_SYMBOL_GPL(regulator_register_notifier); 2964 2965/** 2966 * regulator_unregister_notifier - unregister regulator event notifier 2967 * @regulator: regulator source 2968 * @nb: notifier block 2969 * 2970 * Unregister regulator event notifier block. 2971 */ 2972int regulator_unregister_notifier(struct regulator *regulator, 2973 struct notifier_block *nb) 2974{ 2975 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2976 nb); 2977} 2978EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2979 2980/* notify regulator consumers and downstream regulator consumers. 2981 * Note mutex must be held by caller. 2982 */ 2983static void _notifier_call_chain(struct regulator_dev *rdev, 2984 unsigned long event, void *data) 2985{ 2986 /* call rdev chain first */ 2987 blocking_notifier_call_chain(&rdev->notifier, event, data); 2988} 2989 2990/** 2991 * regulator_bulk_get - get multiple regulator consumers 2992 * 2993 * @dev: Device to supply 2994 * @num_consumers: Number of consumers to register 2995 * @consumers: Configuration of consumers; clients are stored here. 2996 * 2997 * @return 0 on success, an errno on failure. 2998 * 2999 * This helper function allows drivers to get several regulator 3000 * consumers in one operation. If any of the regulators cannot be 3001 * acquired then any regulators that were allocated will be freed 3002 * before returning to the caller. 3003 */ 3004int regulator_bulk_get(struct device *dev, int num_consumers, 3005 struct regulator_bulk_data *consumers) 3006{ 3007 int i; 3008 int ret; 3009 3010 for (i = 0; i < num_consumers; i++) 3011 consumers[i].consumer = NULL; 3012 3013 for (i = 0; i < num_consumers; i++) { 3014 consumers[i].consumer = regulator_get(dev, 3015 consumers[i].supply); 3016 if (IS_ERR(consumers[i].consumer)) { 3017 ret = PTR_ERR(consumers[i].consumer); 3018 dev_err(dev, "Failed to get supply '%s': %d\n", 3019 consumers[i].supply, ret); 3020 consumers[i].consumer = NULL; 3021 goto err; 3022 } 3023 } 3024 3025 return 0; 3026 3027err: 3028 while (--i >= 0) 3029 regulator_put(consumers[i].consumer); 3030 3031 return ret; 3032} 3033EXPORT_SYMBOL_GPL(regulator_bulk_get); 3034 3035static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3036{ 3037 struct regulator_bulk_data *bulk = data; 3038 3039 bulk->ret = regulator_enable(bulk->consumer); 3040} 3041 3042/** 3043 * regulator_bulk_enable - enable multiple regulator consumers 3044 * 3045 * @num_consumers: Number of consumers 3046 * @consumers: Consumer data; clients are stored here. 3047 * @return 0 on success, an errno on failure 3048 * 3049 * This convenience API allows consumers to enable multiple regulator 3050 * clients in a single API call. If any consumers cannot be enabled 3051 * then any others that were enabled will be disabled again prior to 3052 * return. 3053 */ 3054int regulator_bulk_enable(int num_consumers, 3055 struct regulator_bulk_data *consumers) 3056{ 3057 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3058 int i; 3059 int ret = 0; 3060 3061 for (i = 0; i < num_consumers; i++) { 3062 if (consumers[i].consumer->always_on) 3063 consumers[i].ret = 0; 3064 else 3065 async_schedule_domain(regulator_bulk_enable_async, 3066 &consumers[i], &async_domain); 3067 } 3068 3069 async_synchronize_full_domain(&async_domain); 3070 3071 /* If any consumer failed we need to unwind any that succeeded */ 3072 for (i = 0; i < num_consumers; i++) { 3073 if (consumers[i].ret != 0) { 3074 ret = consumers[i].ret; 3075 goto err; 3076 } 3077 } 3078 3079 return 0; 3080 3081err: 3082 for (i = 0; i < num_consumers; i++) { 3083 if (consumers[i].ret < 0) 3084 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3085 consumers[i].ret); 3086 else 3087 regulator_disable(consumers[i].consumer); 3088 } 3089 3090 return ret; 3091} 3092EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3093 3094/** 3095 * regulator_bulk_disable - disable multiple regulator consumers 3096 * 3097 * @num_consumers: Number of consumers 3098 * @consumers: Consumer data; clients are stored here. 3099 * @return 0 on success, an errno on failure 3100 * 3101 * This convenience API allows consumers to disable multiple regulator 3102 * clients in a single API call. If any consumers cannot be disabled 3103 * then any others that were disabled will be enabled again prior to 3104 * return. 3105 */ 3106int regulator_bulk_disable(int num_consumers, 3107 struct regulator_bulk_data *consumers) 3108{ 3109 int i; 3110 int ret, r; 3111 3112 for (i = num_consumers - 1; i >= 0; --i) { 3113 ret = regulator_disable(consumers[i].consumer); 3114 if (ret != 0) 3115 goto err; 3116 } 3117 3118 return 0; 3119 3120err: 3121 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3122 for (++i; i < num_consumers; ++i) { 3123 r = regulator_enable(consumers[i].consumer); 3124 if (r != 0) 3125 pr_err("Failed to reename %s: %d\n", 3126 consumers[i].supply, r); 3127 } 3128 3129 return ret; 3130} 3131EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3132 3133/** 3134 * regulator_bulk_force_disable - force disable multiple regulator consumers 3135 * 3136 * @num_consumers: Number of consumers 3137 * @consumers: Consumer data; clients are stored here. 3138 * @return 0 on success, an errno on failure 3139 * 3140 * This convenience API allows consumers to forcibly disable multiple regulator 3141 * clients in a single API call. 3142 * NOTE: This should be used for situations when device damage will 3143 * likely occur if the regulators are not disabled (e.g. over temp). 3144 * Although regulator_force_disable function call for some consumers can 3145 * return error numbers, the function is called for all consumers. 3146 */ 3147int regulator_bulk_force_disable(int num_consumers, 3148 struct regulator_bulk_data *consumers) 3149{ 3150 int i; 3151 int ret; 3152 3153 for (i = 0; i < num_consumers; i++) 3154 consumers[i].ret = 3155 regulator_force_disable(consumers[i].consumer); 3156 3157 for (i = 0; i < num_consumers; i++) { 3158 if (consumers[i].ret != 0) { 3159 ret = consumers[i].ret; 3160 goto out; 3161 } 3162 } 3163 3164 return 0; 3165out: 3166 return ret; 3167} 3168EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3169 3170/** 3171 * regulator_bulk_free - free multiple regulator consumers 3172 * 3173 * @num_consumers: Number of consumers 3174 * @consumers: Consumer data; clients are stored here. 3175 * 3176 * This convenience API allows consumers to free multiple regulator 3177 * clients in a single API call. 3178 */ 3179void regulator_bulk_free(int num_consumers, 3180 struct regulator_bulk_data *consumers) 3181{ 3182 int i; 3183 3184 for (i = 0; i < num_consumers; i++) { 3185 regulator_put(consumers[i].consumer); 3186 consumers[i].consumer = NULL; 3187 } 3188} 3189EXPORT_SYMBOL_GPL(regulator_bulk_free); 3190 3191/** 3192 * regulator_notifier_call_chain - call regulator event notifier 3193 * @rdev: regulator source 3194 * @event: notifier block 3195 * @data: callback-specific data. 3196 * 3197 * Called by regulator drivers to notify clients a regulator event has 3198 * occurred. We also notify regulator clients downstream. 3199 * Note lock must be held by caller. 3200 */ 3201int regulator_notifier_call_chain(struct regulator_dev *rdev, 3202 unsigned long event, void *data) 3203{ 3204 _notifier_call_chain(rdev, event, data); 3205 return NOTIFY_DONE; 3206 3207} 3208EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3209 3210/** 3211 * regulator_mode_to_status - convert a regulator mode into a status 3212 * 3213 * @mode: Mode to convert 3214 * 3215 * Convert a regulator mode into a status. 3216 */ 3217int regulator_mode_to_status(unsigned int mode) 3218{ 3219 switch (mode) { 3220 case REGULATOR_MODE_FAST: 3221 return REGULATOR_STATUS_FAST; 3222 case REGULATOR_MODE_NORMAL: 3223 return REGULATOR_STATUS_NORMAL; 3224 case REGULATOR_MODE_IDLE: 3225 return REGULATOR_STATUS_IDLE; 3226 case REGULATOR_MODE_STANDBY: 3227 return REGULATOR_STATUS_STANDBY; 3228 default: 3229 return REGULATOR_STATUS_UNDEFINED; 3230 } 3231} 3232EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3233 3234/* 3235 * To avoid cluttering sysfs (and memory) with useless state, only 3236 * create attributes that can be meaningfully displayed. 3237 */ 3238static int add_regulator_attributes(struct regulator_dev *rdev) 3239{ 3240 struct device *dev = &rdev->dev; 3241 struct regulator_ops *ops = rdev->desc->ops; 3242 int status = 0; 3243 3244 /* some attributes need specific methods to be displayed */ 3245 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3246 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3247 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || 3248 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { 3249 status = device_create_file(dev, &dev_attr_microvolts); 3250 if (status < 0) 3251 return status; 3252 } 3253 if (ops->get_current_limit) { 3254 status = device_create_file(dev, &dev_attr_microamps); 3255 if (status < 0) 3256 return status; 3257 } 3258 if (ops->get_mode) { 3259 status = device_create_file(dev, &dev_attr_opmode); 3260 if (status < 0) 3261 return status; 3262 } 3263 if (rdev->ena_pin || ops->is_enabled) { 3264 status = device_create_file(dev, &dev_attr_state); 3265 if (status < 0) 3266 return status; 3267 } 3268 if (ops->get_status) { 3269 status = device_create_file(dev, &dev_attr_status); 3270 if (status < 0) 3271 return status; 3272 } 3273 if (ops->get_bypass) { 3274 status = device_create_file(dev, &dev_attr_bypass); 3275 if (status < 0) 3276 return status; 3277 } 3278 3279 /* some attributes are type-specific */ 3280 if (rdev->desc->type == REGULATOR_CURRENT) { 3281 status = device_create_file(dev, &dev_attr_requested_microamps); 3282 if (status < 0) 3283 return status; 3284 } 3285 3286 /* all the other attributes exist to support constraints; 3287 * don't show them if there are no constraints, or if the 3288 * relevant supporting methods are missing. 3289 */ 3290 if (!rdev->constraints) 3291 return status; 3292 3293 /* constraints need specific supporting methods */ 3294 if (ops->set_voltage || ops->set_voltage_sel) { 3295 status = device_create_file(dev, &dev_attr_min_microvolts); 3296 if (status < 0) 3297 return status; 3298 status = device_create_file(dev, &dev_attr_max_microvolts); 3299 if (status < 0) 3300 return status; 3301 } 3302 if (ops->set_current_limit) { 3303 status = device_create_file(dev, &dev_attr_min_microamps); 3304 if (status < 0) 3305 return status; 3306 status = device_create_file(dev, &dev_attr_max_microamps); 3307 if (status < 0) 3308 return status; 3309 } 3310 3311 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3312 if (status < 0) 3313 return status; 3314 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3315 if (status < 0) 3316 return status; 3317 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3318 if (status < 0) 3319 return status; 3320 3321 if (ops->set_suspend_voltage) { 3322 status = device_create_file(dev, 3323 &dev_attr_suspend_standby_microvolts); 3324 if (status < 0) 3325 return status; 3326 status = device_create_file(dev, 3327 &dev_attr_suspend_mem_microvolts); 3328 if (status < 0) 3329 return status; 3330 status = device_create_file(dev, 3331 &dev_attr_suspend_disk_microvolts); 3332 if (status < 0) 3333 return status; 3334 } 3335 3336 if (ops->set_suspend_mode) { 3337 status = device_create_file(dev, 3338 &dev_attr_suspend_standby_mode); 3339 if (status < 0) 3340 return status; 3341 status = device_create_file(dev, 3342 &dev_attr_suspend_mem_mode); 3343 if (status < 0) 3344 return status; 3345 status = device_create_file(dev, 3346 &dev_attr_suspend_disk_mode); 3347 if (status < 0) 3348 return status; 3349 } 3350 3351 return status; 3352} 3353 3354static void rdev_init_debugfs(struct regulator_dev *rdev) 3355{ 3356 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3357 if (!rdev->debugfs) { 3358 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3359 return; 3360 } 3361 3362 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3363 &rdev->use_count); 3364 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3365 &rdev->open_count); 3366 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3367 &rdev->bypass_count); 3368} 3369 3370/** 3371 * regulator_register - register regulator 3372 * @regulator_desc: regulator to register 3373 * @config: runtime configuration for regulator 3374 * 3375 * Called by regulator drivers to register a regulator. 3376 * Returns a valid pointer to struct regulator_dev on success 3377 * or an ERR_PTR() on error. 3378 */ 3379struct regulator_dev * 3380regulator_register(const struct regulator_desc *regulator_desc, 3381 const struct regulator_config *config) 3382{ 3383 const struct regulation_constraints *constraints = NULL; 3384 const struct regulator_init_data *init_data; 3385 static atomic_t regulator_no = ATOMIC_INIT(0); 3386 struct regulator_dev *rdev; 3387 struct device *dev; 3388 int ret, i; 3389 const char *supply = NULL; 3390 3391 if (regulator_desc == NULL || config == NULL) 3392 return ERR_PTR(-EINVAL); 3393 3394 dev = config->dev; 3395 WARN_ON(!dev); 3396 3397 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3398 return ERR_PTR(-EINVAL); 3399 3400 if (regulator_desc->type != REGULATOR_VOLTAGE && 3401 regulator_desc->type != REGULATOR_CURRENT) 3402 return ERR_PTR(-EINVAL); 3403 3404 /* Only one of each should be implemented */ 3405 WARN_ON(regulator_desc->ops->get_voltage && 3406 regulator_desc->ops->get_voltage_sel); 3407 WARN_ON(regulator_desc->ops->set_voltage && 3408 regulator_desc->ops->set_voltage_sel); 3409 3410 /* If we're using selectors we must implement list_voltage. */ 3411 if (regulator_desc->ops->get_voltage_sel && 3412 !regulator_desc->ops->list_voltage) { 3413 return ERR_PTR(-EINVAL); 3414 } 3415 if (regulator_desc->ops->set_voltage_sel && 3416 !regulator_desc->ops->list_voltage) { 3417 return ERR_PTR(-EINVAL); 3418 } 3419 3420 init_data = config->init_data; 3421 3422 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3423 if (rdev == NULL) 3424 return ERR_PTR(-ENOMEM); 3425 3426 mutex_lock(®ulator_list_mutex); 3427 3428 mutex_init(&rdev->mutex); 3429 rdev->reg_data = config->driver_data; 3430 rdev->owner = regulator_desc->owner; 3431 rdev->desc = regulator_desc; 3432 if (config->regmap) 3433 rdev->regmap = config->regmap; 3434 else if (dev_get_regmap(dev, NULL)) 3435 rdev->regmap = dev_get_regmap(dev, NULL); 3436 else if (dev->parent) 3437 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3438 INIT_LIST_HEAD(&rdev->consumer_list); 3439 INIT_LIST_HEAD(&rdev->list); 3440 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3441 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3442 3443 /* preform any regulator specific init */ 3444 if (init_data && init_data->regulator_init) { 3445 ret = init_data->regulator_init(rdev->reg_data); 3446 if (ret < 0) 3447 goto clean; 3448 } 3449 3450 /* register with sysfs */ 3451 rdev->dev.class = ®ulator_class; 3452 rdev->dev.of_node = config->of_node; 3453 rdev->dev.parent = dev; 3454 dev_set_name(&rdev->dev, "regulator.%d", 3455 atomic_inc_return(®ulator_no) - 1); 3456 ret = device_register(&rdev->dev); 3457 if (ret != 0) { 3458 put_device(&rdev->dev); 3459 goto clean; 3460 } 3461 3462 dev_set_drvdata(&rdev->dev, rdev); 3463 3464 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3465 ret = regulator_ena_gpio_request(rdev, config); 3466 if (ret != 0) { 3467 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3468 config->ena_gpio, ret); 3469 goto wash; 3470 } 3471 3472 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3473 rdev->ena_gpio_state = 1; 3474 3475 if (config->ena_gpio_invert) 3476 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3477 } 3478 3479 /* set regulator constraints */ 3480 if (init_data) 3481 constraints = &init_data->constraints; 3482 3483 ret = set_machine_constraints(rdev, constraints); 3484 if (ret < 0) 3485 goto scrub; 3486 3487 /* add attributes supported by this regulator */ 3488 ret = add_regulator_attributes(rdev); 3489 if (ret < 0) 3490 goto scrub; 3491 3492 if (init_data && init_data->supply_regulator) 3493 supply = init_data->supply_regulator; 3494 else if (regulator_desc->supply_name) 3495 supply = regulator_desc->supply_name; 3496 3497 if (supply) { 3498 struct regulator_dev *r; 3499 3500 r = regulator_dev_lookup(dev, supply, &ret); 3501 3502 if (ret == -ENODEV) { 3503 /* 3504 * No supply was specified for this regulator and 3505 * there will never be one. 3506 */ 3507 ret = 0; 3508 goto add_dev; 3509 } else if (!r) { 3510 dev_err(dev, "Failed to find supply %s\n", supply); 3511 ret = -EPROBE_DEFER; 3512 goto scrub; 3513 } 3514 3515 ret = set_supply(rdev, r); 3516 if (ret < 0) 3517 goto scrub; 3518 3519 /* Enable supply if rail is enabled */ 3520 if (_regulator_is_enabled(rdev)) { 3521 ret = regulator_enable(rdev->supply); 3522 if (ret < 0) 3523 goto scrub; 3524 } 3525 } 3526 3527add_dev: 3528 /* add consumers devices */ 3529 if (init_data) { 3530 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3531 ret = set_consumer_device_supply(rdev, 3532 init_data->consumer_supplies[i].dev_name, 3533 init_data->consumer_supplies[i].supply); 3534 if (ret < 0) { 3535 dev_err(dev, "Failed to set supply %s\n", 3536 init_data->consumer_supplies[i].supply); 3537 goto unset_supplies; 3538 } 3539 } 3540 } 3541 3542 list_add(&rdev->list, ®ulator_list); 3543 3544 rdev_init_debugfs(rdev); 3545out: 3546 mutex_unlock(®ulator_list_mutex); 3547 return rdev; 3548 3549unset_supplies: 3550 unset_regulator_supplies(rdev); 3551 3552scrub: 3553 if (rdev->supply) 3554 _regulator_put(rdev->supply); 3555 regulator_ena_gpio_free(rdev); 3556 kfree(rdev->constraints); 3557wash: 3558 device_unregister(&rdev->dev); 3559 /* device core frees rdev */ 3560 rdev = ERR_PTR(ret); 3561 goto out; 3562 3563clean: 3564 kfree(rdev); 3565 rdev = ERR_PTR(ret); 3566 goto out; 3567} 3568EXPORT_SYMBOL_GPL(regulator_register); 3569 3570/** 3571 * regulator_unregister - unregister regulator 3572 * @rdev: regulator to unregister 3573 * 3574 * Called by regulator drivers to unregister a regulator. 3575 */ 3576void regulator_unregister(struct regulator_dev *rdev) 3577{ 3578 if (rdev == NULL) 3579 return; 3580 3581 if (rdev->supply) { 3582 while (rdev->use_count--) 3583 regulator_disable(rdev->supply); 3584 regulator_put(rdev->supply); 3585 } 3586 mutex_lock(®ulator_list_mutex); 3587 debugfs_remove_recursive(rdev->debugfs); 3588 flush_work(&rdev->disable_work.work); 3589 WARN_ON(rdev->open_count); 3590 unset_regulator_supplies(rdev); 3591 list_del(&rdev->list); 3592 kfree(rdev->constraints); 3593 regulator_ena_gpio_free(rdev); 3594 device_unregister(&rdev->dev); 3595 mutex_unlock(®ulator_list_mutex); 3596} 3597EXPORT_SYMBOL_GPL(regulator_unregister); 3598 3599/** 3600 * regulator_suspend_prepare - prepare regulators for system wide suspend 3601 * @state: system suspend state 3602 * 3603 * Configure each regulator with it's suspend operating parameters for state. 3604 * This will usually be called by machine suspend code prior to supending. 3605 */ 3606int regulator_suspend_prepare(suspend_state_t state) 3607{ 3608 struct regulator_dev *rdev; 3609 int ret = 0; 3610 3611 /* ON is handled by regulator active state */ 3612 if (state == PM_SUSPEND_ON) 3613 return -EINVAL; 3614 3615 mutex_lock(®ulator_list_mutex); 3616 list_for_each_entry(rdev, ®ulator_list, list) { 3617 3618 mutex_lock(&rdev->mutex); 3619 ret = suspend_prepare(rdev, state); 3620 mutex_unlock(&rdev->mutex); 3621 3622 if (ret < 0) { 3623 rdev_err(rdev, "failed to prepare\n"); 3624 goto out; 3625 } 3626 } 3627out: 3628 mutex_unlock(®ulator_list_mutex); 3629 return ret; 3630} 3631EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3632 3633/** 3634 * regulator_suspend_finish - resume regulators from system wide suspend 3635 * 3636 * Turn on regulators that might be turned off by regulator_suspend_prepare 3637 * and that should be turned on according to the regulators properties. 3638 */ 3639int regulator_suspend_finish(void) 3640{ 3641 struct regulator_dev *rdev; 3642 int ret = 0, error; 3643 3644 mutex_lock(®ulator_list_mutex); 3645 list_for_each_entry(rdev, ®ulator_list, list) { 3646 mutex_lock(&rdev->mutex); 3647 if (rdev->use_count > 0 || rdev->constraints->always_on) { 3648 error = _regulator_do_enable(rdev); 3649 if (error) 3650 ret = error; 3651 } else { 3652 if (!have_full_constraints()) 3653 goto unlock; 3654 if (!_regulator_is_enabled(rdev)) 3655 goto unlock; 3656 3657 error = _regulator_do_disable(rdev); 3658 if (error) 3659 ret = error; 3660 } 3661unlock: 3662 mutex_unlock(&rdev->mutex); 3663 } 3664 mutex_unlock(®ulator_list_mutex); 3665 return ret; 3666} 3667EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3668 3669/** 3670 * regulator_has_full_constraints - the system has fully specified constraints 3671 * 3672 * Calling this function will cause the regulator API to disable all 3673 * regulators which have a zero use count and don't have an always_on 3674 * constraint in a late_initcall. 3675 * 3676 * The intention is that this will become the default behaviour in a 3677 * future kernel release so users are encouraged to use this facility 3678 * now. 3679 */ 3680void regulator_has_full_constraints(void) 3681{ 3682 has_full_constraints = 1; 3683} 3684EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3685 3686/** 3687 * rdev_get_drvdata - get rdev regulator driver data 3688 * @rdev: regulator 3689 * 3690 * Get rdev regulator driver private data. This call can be used in the 3691 * regulator driver context. 3692 */ 3693void *rdev_get_drvdata(struct regulator_dev *rdev) 3694{ 3695 return rdev->reg_data; 3696} 3697EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3698 3699/** 3700 * regulator_get_drvdata - get regulator driver data 3701 * @regulator: regulator 3702 * 3703 * Get regulator driver private data. This call can be used in the consumer 3704 * driver context when non API regulator specific functions need to be called. 3705 */ 3706void *regulator_get_drvdata(struct regulator *regulator) 3707{ 3708 return regulator->rdev->reg_data; 3709} 3710EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3711 3712/** 3713 * regulator_set_drvdata - set regulator driver data 3714 * @regulator: regulator 3715 * @data: data 3716 */ 3717void regulator_set_drvdata(struct regulator *regulator, void *data) 3718{ 3719 regulator->rdev->reg_data = data; 3720} 3721EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3722 3723/** 3724 * regulator_get_id - get regulator ID 3725 * @rdev: regulator 3726 */ 3727int rdev_get_id(struct regulator_dev *rdev) 3728{ 3729 return rdev->desc->id; 3730} 3731EXPORT_SYMBOL_GPL(rdev_get_id); 3732 3733struct device *rdev_get_dev(struct regulator_dev *rdev) 3734{ 3735 return &rdev->dev; 3736} 3737EXPORT_SYMBOL_GPL(rdev_get_dev); 3738 3739void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3740{ 3741 return reg_init_data->driver_data; 3742} 3743EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3744 3745#ifdef CONFIG_DEBUG_FS 3746static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3747 size_t count, loff_t *ppos) 3748{ 3749 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3750 ssize_t len, ret = 0; 3751 struct regulator_map *map; 3752 3753 if (!buf) 3754 return -ENOMEM; 3755 3756 list_for_each_entry(map, ®ulator_map_list, list) { 3757 len = snprintf(buf + ret, PAGE_SIZE - ret, 3758 "%s -> %s.%s\n", 3759 rdev_get_name(map->regulator), map->dev_name, 3760 map->supply); 3761 if (len >= 0) 3762 ret += len; 3763 if (ret > PAGE_SIZE) { 3764 ret = PAGE_SIZE; 3765 break; 3766 } 3767 } 3768 3769 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3770 3771 kfree(buf); 3772 3773 return ret; 3774} 3775#endif 3776 3777static const struct file_operations supply_map_fops = { 3778#ifdef CONFIG_DEBUG_FS 3779 .read = supply_map_read_file, 3780 .llseek = default_llseek, 3781#endif 3782}; 3783 3784static int __init regulator_init(void) 3785{ 3786 int ret; 3787 3788 ret = class_register(®ulator_class); 3789 3790 debugfs_root = debugfs_create_dir("regulator", NULL); 3791 if (!debugfs_root) 3792 pr_warn("regulator: Failed to create debugfs directory\n"); 3793 3794 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3795 &supply_map_fops); 3796 3797 regulator_dummy_init(); 3798 3799 return ret; 3800} 3801 3802/* init early to allow our consumers to complete system booting */ 3803core_initcall(regulator_init); 3804 3805static int __init regulator_init_complete(void) 3806{ 3807 struct regulator_dev *rdev; 3808 struct regulator_ops *ops; 3809 struct regulation_constraints *c; 3810 int enabled, ret; 3811 3812 /* 3813 * Since DT doesn't provide an idiomatic mechanism for 3814 * enabling full constraints and since it's much more natural 3815 * with DT to provide them just assume that a DT enabled 3816 * system has full constraints. 3817 */ 3818 if (of_have_populated_dt()) 3819 has_full_constraints = true; 3820 3821 mutex_lock(®ulator_list_mutex); 3822 3823 /* If we have a full configuration then disable any regulators 3824 * which are not in use or always_on. This will become the 3825 * default behaviour in the future. 3826 */ 3827 list_for_each_entry(rdev, ®ulator_list, list) { 3828 ops = rdev->desc->ops; 3829 c = rdev->constraints; 3830 3831 if (c && c->always_on) 3832 continue; 3833 3834 mutex_lock(&rdev->mutex); 3835 3836 if (rdev->use_count) 3837 goto unlock; 3838 3839 /* If we can't read the status assume it's on. */ 3840 if (ops->is_enabled) 3841 enabled = ops->is_enabled(rdev); 3842 else 3843 enabled = 1; 3844 3845 if (!enabled) 3846 goto unlock; 3847 3848 if (have_full_constraints()) { 3849 /* We log since this may kill the system if it 3850 * goes wrong. */ 3851 rdev_info(rdev, "disabling\n"); 3852 ret = _regulator_do_disable(rdev); 3853 if (ret != 0) 3854 rdev_err(rdev, "couldn't disable: %d\n", ret); 3855 } else { 3856 /* The intention is that in future we will 3857 * assume that full constraints are provided 3858 * so warn even if we aren't going to do 3859 * anything here. 3860 */ 3861 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3862 } 3863 3864unlock: 3865 mutex_unlock(&rdev->mutex); 3866 } 3867 3868 mutex_unlock(®ulator_list_mutex); 3869 3870 return 0; 3871} 3872late_initcall(regulator_init_complete); 3873