core.c revision 04eca28cde52cdf9eb91e127cc358ad79a8ec53b
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39#include "internal.h" 40 41#define rdev_crit(rdev, fmt, ...) \ 42 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_err(rdev, fmt, ...) \ 44 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_warn(rdev, fmt, ...) \ 46 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_info(rdev, fmt, ...) \ 48 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49#define rdev_dbg(rdev, fmt, ...) \ 50 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 51 52static DEFINE_MUTEX(regulator_list_mutex); 53static LIST_HEAD(regulator_list); 54static LIST_HEAD(regulator_map_list); 55static LIST_HEAD(regulator_ena_gpio_list); 56static LIST_HEAD(regulator_supply_alias_list); 57static bool has_full_constraints; 58 59static struct dentry *debugfs_root; 60 61/* 62 * struct regulator_map 63 * 64 * Used to provide symbolic supply names to devices. 65 */ 66struct regulator_map { 67 struct list_head list; 68 const char *dev_name; /* The dev_name() for the consumer */ 69 const char *supply; 70 struct regulator_dev *regulator; 71}; 72 73/* 74 * struct regulator_enable_gpio 75 * 76 * Management for shared enable GPIO pin 77 */ 78struct regulator_enable_gpio { 79 struct list_head list; 80 int gpio; 81 u32 enable_count; /* a number of enabled shared GPIO */ 82 u32 request_count; /* a number of requested shared GPIO */ 83 unsigned int ena_gpio_invert:1; 84}; 85 86/* 87 * struct regulator_supply_alias 88 * 89 * Used to map lookups for a supply onto an alternative device. 90 */ 91struct regulator_supply_alias { 92 struct list_head list; 93 struct device *src_dev; 94 const char *src_supply; 95 struct device *alias_dev; 96 const char *alias_supply; 97}; 98 99static int _regulator_is_enabled(struct regulator_dev *rdev); 100static int _regulator_disable(struct regulator_dev *rdev); 101static int _regulator_get_voltage(struct regulator_dev *rdev); 102static int _regulator_get_current_limit(struct regulator_dev *rdev); 103static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 104static void _notifier_call_chain(struct regulator_dev *rdev, 105 unsigned long event, void *data); 106static int _regulator_do_set_voltage(struct regulator_dev *rdev, 107 int min_uV, int max_uV); 108static struct regulator *create_regulator(struct regulator_dev *rdev, 109 struct device *dev, 110 const char *supply_name); 111 112static const char *rdev_get_name(struct regulator_dev *rdev) 113{ 114 if (rdev->constraints && rdev->constraints->name) 115 return rdev->constraints->name; 116 else if (rdev->desc->name) 117 return rdev->desc->name; 118 else 119 return ""; 120} 121 122static bool have_full_constraints(void) 123{ 124 return has_full_constraints || of_have_populated_dt(); 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t name_show(struct device *dev, struct device_attribute *attr, 327 char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333static DEVICE_ATTR_RO(name); 334 335static ssize_t regulator_print_opmode(char *buf, int mode) 336{ 337 switch (mode) { 338 case REGULATOR_MODE_FAST: 339 return sprintf(buf, "fast\n"); 340 case REGULATOR_MODE_NORMAL: 341 return sprintf(buf, "normal\n"); 342 case REGULATOR_MODE_IDLE: 343 return sprintf(buf, "idle\n"); 344 case REGULATOR_MODE_STANDBY: 345 return sprintf(buf, "standby\n"); 346 } 347 return sprintf(buf, "unknown\n"); 348} 349 350static ssize_t regulator_opmode_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352{ 353 struct regulator_dev *rdev = dev_get_drvdata(dev); 354 355 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 356} 357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 358 359static ssize_t regulator_print_state(char *buf, int state) 360{ 361 if (state > 0) 362 return sprintf(buf, "enabled\n"); 363 else if (state == 0) 364 return sprintf(buf, "disabled\n"); 365 else 366 return sprintf(buf, "unknown\n"); 367} 368 369static ssize_t regulator_state_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct regulator_dev *rdev = dev_get_drvdata(dev); 373 ssize_t ret; 374 375 mutex_lock(&rdev->mutex); 376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 377 mutex_unlock(&rdev->mutex); 378 379 return ret; 380} 381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 382 383static ssize_t regulator_status_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 int status; 388 char *label; 389 390 status = rdev->desc->ops->get_status(rdev); 391 if (status < 0) 392 return status; 393 394 switch (status) { 395 case REGULATOR_STATUS_OFF: 396 label = "off"; 397 break; 398 case REGULATOR_STATUS_ON: 399 label = "on"; 400 break; 401 case REGULATOR_STATUS_ERROR: 402 label = "error"; 403 break; 404 case REGULATOR_STATUS_FAST: 405 label = "fast"; 406 break; 407 case REGULATOR_STATUS_NORMAL: 408 label = "normal"; 409 break; 410 case REGULATOR_STATUS_IDLE: 411 label = "idle"; 412 break; 413 case REGULATOR_STATUS_STANDBY: 414 label = "standby"; 415 break; 416 case REGULATOR_STATUS_BYPASS: 417 label = "bypass"; 418 break; 419 case REGULATOR_STATUS_UNDEFINED: 420 label = "undefined"; 421 break; 422 default: 423 return -ERANGE; 424 } 425 426 return sprintf(buf, "%s\n", label); 427} 428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 429 430static ssize_t regulator_min_uA_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432{ 433 struct regulator_dev *rdev = dev_get_drvdata(dev); 434 435 if (!rdev->constraints) 436 return sprintf(buf, "constraint not defined\n"); 437 438 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 439} 440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 441 442static ssize_t regulator_max_uA_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 if (!rdev->constraints) 448 return sprintf(buf, "constraint not defined\n"); 449 450 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 451} 452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 453 454static ssize_t regulator_min_uV_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 if (!rdev->constraints) 460 return sprintf(buf, "constraint not defined\n"); 461 462 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 463} 464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 465 466static ssize_t regulator_max_uV_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468{ 469 struct regulator_dev *rdev = dev_get_drvdata(dev); 470 471 if (!rdev->constraints) 472 return sprintf(buf, "constraint not defined\n"); 473 474 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 475} 476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 477 478static ssize_t regulator_total_uA_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 struct regulator *regulator; 483 int uA = 0; 484 485 mutex_lock(&rdev->mutex); 486 list_for_each_entry(regulator, &rdev->consumer_list, list) 487 uA += regulator->uA_load; 488 mutex_unlock(&rdev->mutex); 489 return sprintf(buf, "%d\n", uA); 490} 491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 492 493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 494 char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 return sprintf(buf, "%d\n", rdev->use_count); 498} 499static DEVICE_ATTR_RO(num_users); 500 501static ssize_t type_show(struct device *dev, struct device_attribute *attr, 502 char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514static DEVICE_ATTR_RO(type); 515 516static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 522} 523static DEVICE_ATTR(suspend_mem_microvolts, 0444, 524 regulator_suspend_mem_uV_show, NULL); 525 526static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 532} 533static DEVICE_ATTR(suspend_disk_microvolts, 0444, 534 regulator_suspend_disk_uV_show, NULL); 535 536static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 struct regulator_dev *rdev = dev_get_drvdata(dev); 540 541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 542} 543static DEVICE_ATTR(suspend_standby_microvolts, 0444, 544 regulator_suspend_standby_uV_show, NULL); 545 546static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 547 struct device_attribute *attr, char *buf) 548{ 549 struct regulator_dev *rdev = dev_get_drvdata(dev); 550 551 return regulator_print_opmode(buf, 552 rdev->constraints->state_mem.mode); 553} 554static DEVICE_ATTR(suspend_mem_mode, 0444, 555 regulator_suspend_mem_mode_show, NULL); 556 557static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 558 struct device_attribute *attr, char *buf) 559{ 560 struct regulator_dev *rdev = dev_get_drvdata(dev); 561 562 return regulator_print_opmode(buf, 563 rdev->constraints->state_disk.mode); 564} 565static DEVICE_ATTR(suspend_disk_mode, 0444, 566 regulator_suspend_disk_mode_show, NULL); 567 568static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 569 struct device_attribute *attr, char *buf) 570{ 571 struct regulator_dev *rdev = dev_get_drvdata(dev); 572 573 return regulator_print_opmode(buf, 574 rdev->constraints->state_standby.mode); 575} 576static DEVICE_ATTR(suspend_standby_mode, 0444, 577 regulator_suspend_standby_mode_show, NULL); 578 579static ssize_t regulator_suspend_mem_state_show(struct device *dev, 580 struct device_attribute *attr, char *buf) 581{ 582 struct regulator_dev *rdev = dev_get_drvdata(dev); 583 584 return regulator_print_state(buf, 585 rdev->constraints->state_mem.enabled); 586} 587static DEVICE_ATTR(suspend_mem_state, 0444, 588 regulator_suspend_mem_state_show, NULL); 589 590static ssize_t regulator_suspend_disk_state_show(struct device *dev, 591 struct device_attribute *attr, char *buf) 592{ 593 struct regulator_dev *rdev = dev_get_drvdata(dev); 594 595 return regulator_print_state(buf, 596 rdev->constraints->state_disk.enabled); 597} 598static DEVICE_ATTR(suspend_disk_state, 0444, 599 regulator_suspend_disk_state_show, NULL); 600 601static ssize_t regulator_suspend_standby_state_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603{ 604 struct regulator_dev *rdev = dev_get_drvdata(dev); 605 606 return regulator_print_state(buf, 607 rdev->constraints->state_standby.enabled); 608} 609static DEVICE_ATTR(suspend_standby_state, 0444, 610 regulator_suspend_standby_state_show, NULL); 611 612static ssize_t regulator_bypass_show(struct device *dev, 613 struct device_attribute *attr, char *buf) 614{ 615 struct regulator_dev *rdev = dev_get_drvdata(dev); 616 const char *report; 617 bool bypass; 618 int ret; 619 620 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 621 622 if (ret != 0) 623 report = "unknown"; 624 else if (bypass) 625 report = "enabled"; 626 else 627 report = "disabled"; 628 629 return sprintf(buf, "%s\n", report); 630} 631static DEVICE_ATTR(bypass, 0444, 632 regulator_bypass_show, NULL); 633 634/* 635 * These are the only attributes are present for all regulators. 636 * Other attributes are a function of regulator functionality. 637 */ 638static struct attribute *regulator_dev_attrs[] = { 639 &dev_attr_name.attr, 640 &dev_attr_num_users.attr, 641 &dev_attr_type.attr, 642 NULL, 643}; 644ATTRIBUTE_GROUPS(regulator_dev); 645 646static void regulator_dev_release(struct device *dev) 647{ 648 struct regulator_dev *rdev = dev_get_drvdata(dev); 649 kfree(rdev); 650} 651 652static struct class regulator_class = { 653 .name = "regulator", 654 .dev_release = regulator_dev_release, 655 .dev_groups = regulator_dev_groups, 656}; 657 658/* Calculate the new optimum regulator operating mode based on the new total 659 * consumer load. All locks held by caller */ 660static void drms_uA_update(struct regulator_dev *rdev) 661{ 662 struct regulator *sibling; 663 int current_uA = 0, output_uV, input_uV, err; 664 unsigned int mode; 665 666 err = regulator_check_drms(rdev); 667 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 668 (!rdev->desc->ops->get_voltage && 669 !rdev->desc->ops->get_voltage_sel) || 670 !rdev->desc->ops->set_mode) 671 return; 672 673 /* get output voltage */ 674 output_uV = _regulator_get_voltage(rdev); 675 if (output_uV <= 0) 676 return; 677 678 /* get input voltage */ 679 input_uV = 0; 680 if (rdev->supply) 681 input_uV = regulator_get_voltage(rdev->supply); 682 if (input_uV <= 0) 683 input_uV = rdev->constraints->input_uV; 684 if (input_uV <= 0) 685 return; 686 687 /* calc total requested load */ 688 list_for_each_entry(sibling, &rdev->consumer_list, list) 689 current_uA += sibling->uA_load; 690 691 /* now get the optimum mode for our new total regulator load */ 692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 693 output_uV, current_uA); 694 695 /* check the new mode is allowed */ 696 err = regulator_mode_constrain(rdev, &mode); 697 if (err == 0) 698 rdev->desc->ops->set_mode(rdev, mode); 699} 700 701static int suspend_set_state(struct regulator_dev *rdev, 702 struct regulator_state *rstate) 703{ 704 int ret = 0; 705 706 /* If we have no suspend mode configration don't set anything; 707 * only warn if the driver implements set_suspend_voltage or 708 * set_suspend_mode callback. 709 */ 710 if (!rstate->enabled && !rstate->disabled) { 711 if (rdev->desc->ops->set_suspend_voltage || 712 rdev->desc->ops->set_suspend_mode) 713 rdev_warn(rdev, "No configuration\n"); 714 return 0; 715 } 716 717 if (rstate->enabled && rstate->disabled) { 718 rdev_err(rdev, "invalid configuration\n"); 719 return -EINVAL; 720 } 721 722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 723 ret = rdev->desc->ops->set_suspend_enable(rdev); 724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 725 ret = rdev->desc->ops->set_suspend_disable(rdev); 726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 727 ret = 0; 728 729 if (ret < 0) { 730 rdev_err(rdev, "failed to enabled/disable\n"); 731 return ret; 732 } 733 734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 736 if (ret < 0) { 737 rdev_err(rdev, "failed to set voltage\n"); 738 return ret; 739 } 740 } 741 742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 744 if (ret < 0) { 745 rdev_err(rdev, "failed to set mode\n"); 746 return ret; 747 } 748 } 749 return ret; 750} 751 752/* locks held by caller */ 753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 754{ 755 if (!rdev->constraints) 756 return -EINVAL; 757 758 switch (state) { 759 case PM_SUSPEND_STANDBY: 760 return suspend_set_state(rdev, 761 &rdev->constraints->state_standby); 762 case PM_SUSPEND_MEM: 763 return suspend_set_state(rdev, 764 &rdev->constraints->state_mem); 765 case PM_SUSPEND_MAX: 766 return suspend_set_state(rdev, 767 &rdev->constraints->state_disk); 768 default: 769 return -EINVAL; 770 } 771} 772 773static void print_constraints(struct regulator_dev *rdev) 774{ 775 struct regulation_constraints *constraints = rdev->constraints; 776 char buf[80] = ""; 777 int count = 0; 778 int ret; 779 780 if (constraints->min_uV && constraints->max_uV) { 781 if (constraints->min_uV == constraints->max_uV) 782 count += sprintf(buf + count, "%d mV ", 783 constraints->min_uV / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mV ", 786 constraints->min_uV / 1000, 787 constraints->max_uV / 1000); 788 } 789 790 if (!constraints->min_uV || 791 constraints->min_uV != constraints->max_uV) { 792 ret = _regulator_get_voltage(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mV ", ret / 1000); 795 } 796 797 if (constraints->uV_offset) 798 count += sprintf(buf, "%dmV offset ", 799 constraints->uV_offset / 1000); 800 801 if (constraints->min_uA && constraints->max_uA) { 802 if (constraints->min_uA == constraints->max_uA) 803 count += sprintf(buf + count, "%d mA ", 804 constraints->min_uA / 1000); 805 else 806 count += sprintf(buf + count, "%d <--> %d mA ", 807 constraints->min_uA / 1000, 808 constraints->max_uA / 1000); 809 } 810 811 if (!constraints->min_uA || 812 constraints->min_uA != constraints->max_uA) { 813 ret = _regulator_get_current_limit(rdev); 814 if (ret > 0) 815 count += sprintf(buf + count, "at %d mA ", ret / 1000); 816 } 817 818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 819 count += sprintf(buf + count, "fast "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 821 count += sprintf(buf + count, "normal "); 822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 823 count += sprintf(buf + count, "idle "); 824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 825 count += sprintf(buf + count, "standby"); 826 827 if (!count) 828 sprintf(buf, "no parameters"); 829 830 rdev_info(rdev, "%s\n", buf); 831 832 if ((constraints->min_uV != constraints->max_uV) && 833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 834 rdev_warn(rdev, 835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 836} 837 838static int machine_constraints_voltage(struct regulator_dev *rdev, 839 struct regulation_constraints *constraints) 840{ 841 struct regulator_ops *ops = rdev->desc->ops; 842 int ret; 843 844 /* do we need to apply the constraint voltage */ 845 if (rdev->constraints->apply_uV && 846 rdev->constraints->min_uV == rdev->constraints->max_uV) { 847 int current_uV = _regulator_get_voltage(rdev); 848 if (current_uV < 0) { 849 rdev_err(rdev, "failed to get the current voltage\n"); 850 return current_uV; 851 } 852 if (current_uV < rdev->constraints->min_uV || 853 current_uV > rdev->constraints->max_uV) { 854 ret = _regulator_do_set_voltage( 855 rdev, rdev->constraints->min_uV, 856 rdev->constraints->max_uV); 857 if (ret < 0) { 858 rdev_err(rdev, 859 "failed to apply %duV constraint\n", 860 rdev->constraints->min_uV); 861 return ret; 862 } 863 } 864 } 865 866 /* constrain machine-level voltage specs to fit 867 * the actual range supported by this regulator. 868 */ 869 if (ops->list_voltage && rdev->desc->n_voltages) { 870 int count = rdev->desc->n_voltages; 871 int i; 872 int min_uV = INT_MAX; 873 int max_uV = INT_MIN; 874 int cmin = constraints->min_uV; 875 int cmax = constraints->max_uV; 876 877 /* it's safe to autoconfigure fixed-voltage supplies 878 and the constraints are used by list_voltage. */ 879 if (count == 1 && !cmin) { 880 cmin = 1; 881 cmax = INT_MAX; 882 constraints->min_uV = cmin; 883 constraints->max_uV = cmax; 884 } 885 886 /* voltage constraints are optional */ 887 if ((cmin == 0) && (cmax == 0)) 888 return 0; 889 890 /* else require explicit machine-level constraints */ 891 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 892 rdev_err(rdev, "invalid voltage constraints\n"); 893 return -EINVAL; 894 } 895 896 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 897 for (i = 0; i < count; i++) { 898 int value; 899 900 value = ops->list_voltage(rdev, i); 901 if (value <= 0) 902 continue; 903 904 /* maybe adjust [min_uV..max_uV] */ 905 if (value >= cmin && value < min_uV) 906 min_uV = value; 907 if (value <= cmax && value > max_uV) 908 max_uV = value; 909 } 910 911 /* final: [min_uV..max_uV] valid iff constraints valid */ 912 if (max_uV < min_uV) { 913 rdev_err(rdev, 914 "unsupportable voltage constraints %u-%uuV\n", 915 min_uV, max_uV); 916 return -EINVAL; 917 } 918 919 /* use regulator's subset of machine constraints */ 920 if (constraints->min_uV < min_uV) { 921 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 922 constraints->min_uV, min_uV); 923 constraints->min_uV = min_uV; 924 } 925 if (constraints->max_uV > max_uV) { 926 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 927 constraints->max_uV, max_uV); 928 constraints->max_uV = max_uV; 929 } 930 } 931 932 return 0; 933} 934 935static int machine_constraints_current(struct regulator_dev *rdev, 936 struct regulation_constraints *constraints) 937{ 938 struct regulator_ops *ops = rdev->desc->ops; 939 int ret; 940 941 if (!constraints->min_uA && !constraints->max_uA) 942 return 0; 943 944 if (constraints->min_uA > constraints->max_uA) { 945 rdev_err(rdev, "Invalid current constraints\n"); 946 return -EINVAL; 947 } 948 949 if (!ops->set_current_limit || !ops->get_current_limit) { 950 rdev_warn(rdev, "Operation of current configuration missing\n"); 951 return 0; 952 } 953 954 /* Set regulator current in constraints range */ 955 ret = ops->set_current_limit(rdev, constraints->min_uA, 956 constraints->max_uA); 957 if (ret < 0) { 958 rdev_err(rdev, "Failed to set current constraint, %d\n", ret); 959 return ret; 960 } 961 962 return 0; 963} 964 965static int _regulator_do_enable(struct regulator_dev *rdev); 966 967/** 968 * set_machine_constraints - sets regulator constraints 969 * @rdev: regulator source 970 * @constraints: constraints to apply 971 * 972 * Allows platform initialisation code to define and constrain 973 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 974 * Constraints *must* be set by platform code in order for some 975 * regulator operations to proceed i.e. set_voltage, set_current_limit, 976 * set_mode. 977 */ 978static int set_machine_constraints(struct regulator_dev *rdev, 979 const struct regulation_constraints *constraints) 980{ 981 int ret = 0; 982 struct regulator_ops *ops = rdev->desc->ops; 983 984 if (constraints) 985 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 986 GFP_KERNEL); 987 else 988 rdev->constraints = kzalloc(sizeof(*constraints), 989 GFP_KERNEL); 990 if (!rdev->constraints) 991 return -ENOMEM; 992 993 ret = machine_constraints_voltage(rdev, rdev->constraints); 994 if (ret != 0) 995 goto out; 996 997 ret = machine_constraints_current(rdev, rdev->constraints); 998 if (ret != 0) 999 goto out; 1000 1001 /* do we need to setup our suspend state */ 1002 if (rdev->constraints->initial_state) { 1003 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 1004 if (ret < 0) { 1005 rdev_err(rdev, "failed to set suspend state\n"); 1006 goto out; 1007 } 1008 } 1009 1010 if (rdev->constraints->initial_mode) { 1011 if (!ops->set_mode) { 1012 rdev_err(rdev, "no set_mode operation\n"); 1013 ret = -EINVAL; 1014 goto out; 1015 } 1016 1017 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 1018 if (ret < 0) { 1019 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 1020 goto out; 1021 } 1022 } 1023 1024 /* If the constraints say the regulator should be on at this point 1025 * and we have control then make sure it is enabled. 1026 */ 1027 if (rdev->constraints->always_on || rdev->constraints->boot_on) { 1028 ret = _regulator_do_enable(rdev); 1029 if (ret < 0 && ret != -EINVAL) { 1030 rdev_err(rdev, "failed to enable\n"); 1031 goto out; 1032 } 1033 } 1034 1035 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 1036 && ops->set_ramp_delay) { 1037 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 1038 if (ret < 0) { 1039 rdev_err(rdev, "failed to set ramp_delay\n"); 1040 goto out; 1041 } 1042 } 1043 1044 print_constraints(rdev); 1045 return 0; 1046out: 1047 kfree(rdev->constraints); 1048 rdev->constraints = NULL; 1049 return ret; 1050} 1051 1052/** 1053 * set_supply - set regulator supply regulator 1054 * @rdev: regulator name 1055 * @supply_rdev: supply regulator name 1056 * 1057 * Called by platform initialisation code to set the supply regulator for this 1058 * regulator. This ensures that a regulators supply will also be enabled by the 1059 * core if it's child is enabled. 1060 */ 1061static int set_supply(struct regulator_dev *rdev, 1062 struct regulator_dev *supply_rdev) 1063{ 1064 int err; 1065 1066 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1067 1068 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1069 if (rdev->supply == NULL) { 1070 err = -ENOMEM; 1071 return err; 1072 } 1073 supply_rdev->open_count++; 1074 1075 return 0; 1076} 1077 1078/** 1079 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1080 * @rdev: regulator source 1081 * @consumer_dev_name: dev_name() string for device supply applies to 1082 * @supply: symbolic name for supply 1083 * 1084 * Allows platform initialisation code to map physical regulator 1085 * sources to symbolic names for supplies for use by devices. Devices 1086 * should use these symbolic names to request regulators, avoiding the 1087 * need to provide board-specific regulator names as platform data. 1088 */ 1089static int set_consumer_device_supply(struct regulator_dev *rdev, 1090 const char *consumer_dev_name, 1091 const char *supply) 1092{ 1093 struct regulator_map *node; 1094 int has_dev; 1095 1096 if (supply == NULL) 1097 return -EINVAL; 1098 1099 if (consumer_dev_name != NULL) 1100 has_dev = 1; 1101 else 1102 has_dev = 0; 1103 1104 list_for_each_entry(node, ®ulator_map_list, list) { 1105 if (node->dev_name && consumer_dev_name) { 1106 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1107 continue; 1108 } else if (node->dev_name || consumer_dev_name) { 1109 continue; 1110 } 1111 1112 if (strcmp(node->supply, supply) != 0) 1113 continue; 1114 1115 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1116 consumer_dev_name, 1117 dev_name(&node->regulator->dev), 1118 node->regulator->desc->name, 1119 supply, 1120 dev_name(&rdev->dev), rdev_get_name(rdev)); 1121 return -EBUSY; 1122 } 1123 1124 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1125 if (node == NULL) 1126 return -ENOMEM; 1127 1128 node->regulator = rdev; 1129 node->supply = supply; 1130 1131 if (has_dev) { 1132 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1133 if (node->dev_name == NULL) { 1134 kfree(node); 1135 return -ENOMEM; 1136 } 1137 } 1138 1139 list_add(&node->list, ®ulator_map_list); 1140 return 0; 1141} 1142 1143static void unset_regulator_supplies(struct regulator_dev *rdev) 1144{ 1145 struct regulator_map *node, *n; 1146 1147 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1148 if (rdev == node->regulator) { 1149 list_del(&node->list); 1150 kfree(node->dev_name); 1151 kfree(node); 1152 } 1153 } 1154} 1155 1156#define REG_STR_SIZE 64 1157 1158static struct regulator *create_regulator(struct regulator_dev *rdev, 1159 struct device *dev, 1160 const char *supply_name) 1161{ 1162 struct regulator *regulator; 1163 char buf[REG_STR_SIZE]; 1164 int err, size; 1165 1166 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1167 if (regulator == NULL) 1168 return NULL; 1169 1170 mutex_lock(&rdev->mutex); 1171 regulator->rdev = rdev; 1172 list_add(®ulator->list, &rdev->consumer_list); 1173 1174 if (dev) { 1175 regulator->dev = dev; 1176 1177 /* Add a link to the device sysfs entry */ 1178 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1179 dev->kobj.name, supply_name); 1180 if (size >= REG_STR_SIZE) 1181 goto overflow_err; 1182 1183 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1184 if (regulator->supply_name == NULL) 1185 goto overflow_err; 1186 1187 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1188 buf); 1189 if (err) { 1190 rdev_warn(rdev, "could not add device link %s err %d\n", 1191 dev->kobj.name, err); 1192 /* non-fatal */ 1193 } 1194 } else { 1195 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1196 if (regulator->supply_name == NULL) 1197 goto overflow_err; 1198 } 1199 1200 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1201 rdev->debugfs); 1202 if (!regulator->debugfs) { 1203 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1204 } else { 1205 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1206 ®ulator->uA_load); 1207 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1208 ®ulator->min_uV); 1209 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1210 ®ulator->max_uV); 1211 } 1212 1213 /* 1214 * Check now if the regulator is an always on regulator - if 1215 * it is then we don't need to do nearly so much work for 1216 * enable/disable calls. 1217 */ 1218 if (!_regulator_can_change_status(rdev) && 1219 _regulator_is_enabled(rdev)) 1220 regulator->always_on = true; 1221 1222 mutex_unlock(&rdev->mutex); 1223 return regulator; 1224overflow_err: 1225 list_del(®ulator->list); 1226 kfree(regulator); 1227 mutex_unlock(&rdev->mutex); 1228 return NULL; 1229} 1230 1231static int _regulator_get_enable_time(struct regulator_dev *rdev) 1232{ 1233 if (rdev->constraints && rdev->constraints->enable_time) 1234 return rdev->constraints->enable_time; 1235 if (!rdev->desc->ops->enable_time) 1236 return rdev->desc->enable_time; 1237 return rdev->desc->ops->enable_time(rdev); 1238} 1239 1240static struct regulator_supply_alias *regulator_find_supply_alias( 1241 struct device *dev, const char *supply) 1242{ 1243 struct regulator_supply_alias *map; 1244 1245 list_for_each_entry(map, ®ulator_supply_alias_list, list) 1246 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) 1247 return map; 1248 1249 return NULL; 1250} 1251 1252static void regulator_supply_alias(struct device **dev, const char **supply) 1253{ 1254 struct regulator_supply_alias *map; 1255 1256 map = regulator_find_supply_alias(*dev, *supply); 1257 if (map) { 1258 dev_dbg(*dev, "Mapping supply %s to %s,%s\n", 1259 *supply, map->alias_supply, 1260 dev_name(map->alias_dev)); 1261 *dev = map->alias_dev; 1262 *supply = map->alias_supply; 1263 } 1264} 1265 1266static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1267 const char *supply, 1268 int *ret) 1269{ 1270 struct regulator_dev *r; 1271 struct device_node *node; 1272 struct regulator_map *map; 1273 const char *devname = NULL; 1274 1275 regulator_supply_alias(&dev, &supply); 1276 1277 /* first do a dt based lookup */ 1278 if (dev && dev->of_node) { 1279 node = of_get_regulator(dev, supply); 1280 if (node) { 1281 list_for_each_entry(r, ®ulator_list, list) 1282 if (r->dev.parent && 1283 node == r->dev.of_node) 1284 return r; 1285 *ret = -EPROBE_DEFER; 1286 return NULL; 1287 } else { 1288 /* 1289 * If we couldn't even get the node then it's 1290 * not just that the device didn't register 1291 * yet, there's no node and we'll never 1292 * succeed. 1293 */ 1294 *ret = -ENODEV; 1295 } 1296 } 1297 1298 /* if not found, try doing it non-dt way */ 1299 if (dev) 1300 devname = dev_name(dev); 1301 1302 list_for_each_entry(r, ®ulator_list, list) 1303 if (strcmp(rdev_get_name(r), supply) == 0) 1304 return r; 1305 1306 list_for_each_entry(map, ®ulator_map_list, list) { 1307 /* If the mapping has a device set up it must match */ 1308 if (map->dev_name && 1309 (!devname || strcmp(map->dev_name, devname))) 1310 continue; 1311 1312 if (strcmp(map->supply, supply) == 0) 1313 return map->regulator; 1314 } 1315 1316 1317 return NULL; 1318} 1319 1320/* Internal regulator request function */ 1321static struct regulator *_regulator_get(struct device *dev, const char *id, 1322 bool exclusive, bool allow_dummy) 1323{ 1324 struct regulator_dev *rdev; 1325 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1326 const char *devname = NULL; 1327 int ret; 1328 1329 if (id == NULL) { 1330 pr_err("get() with no identifier\n"); 1331 return ERR_PTR(-EINVAL); 1332 } 1333 1334 if (dev) 1335 devname = dev_name(dev); 1336 1337 if (have_full_constraints()) 1338 ret = -ENODEV; 1339 else 1340 ret = -EPROBE_DEFER; 1341 1342 mutex_lock(®ulator_list_mutex); 1343 1344 rdev = regulator_dev_lookup(dev, id, &ret); 1345 if (rdev) 1346 goto found; 1347 1348 regulator = ERR_PTR(ret); 1349 1350 /* 1351 * If we have return value from dev_lookup fail, we do not expect to 1352 * succeed, so, quit with appropriate error value 1353 */ 1354 if (ret && ret != -ENODEV) 1355 goto out; 1356 1357 if (!devname) 1358 devname = "deviceless"; 1359 1360 /* 1361 * Assume that a regulator is physically present and enabled 1362 * even if it isn't hooked up and just provide a dummy. 1363 */ 1364 if (have_full_constraints() && allow_dummy) { 1365 pr_warn("%s supply %s not found, using dummy regulator\n", 1366 devname, id); 1367 1368 rdev = dummy_regulator_rdev; 1369 goto found; 1370 /* Don't log an error when called from regulator_get_optional() */ 1371 } else if (!have_full_constraints() || exclusive) { 1372 dev_warn(dev, "dummy supplies not allowed\n"); 1373 } 1374 1375 mutex_unlock(®ulator_list_mutex); 1376 return regulator; 1377 1378found: 1379 if (rdev->exclusive) { 1380 regulator = ERR_PTR(-EPERM); 1381 goto out; 1382 } 1383 1384 if (exclusive && rdev->open_count) { 1385 regulator = ERR_PTR(-EBUSY); 1386 goto out; 1387 } 1388 1389 if (!try_module_get(rdev->owner)) 1390 goto out; 1391 1392 regulator = create_regulator(rdev, dev, id); 1393 if (regulator == NULL) { 1394 regulator = ERR_PTR(-ENOMEM); 1395 module_put(rdev->owner); 1396 goto out; 1397 } 1398 1399 rdev->open_count++; 1400 if (exclusive) { 1401 rdev->exclusive = 1; 1402 1403 ret = _regulator_is_enabled(rdev); 1404 if (ret > 0) 1405 rdev->use_count = 1; 1406 else 1407 rdev->use_count = 0; 1408 } 1409 1410out: 1411 mutex_unlock(®ulator_list_mutex); 1412 1413 return regulator; 1414} 1415 1416/** 1417 * regulator_get - lookup and obtain a reference to a regulator. 1418 * @dev: device for regulator "consumer" 1419 * @id: Supply name or regulator ID. 1420 * 1421 * Returns a struct regulator corresponding to the regulator producer, 1422 * or IS_ERR() condition containing errno. 1423 * 1424 * Use of supply names configured via regulator_set_device_supply() is 1425 * strongly encouraged. It is recommended that the supply name used 1426 * should match the name used for the supply and/or the relevant 1427 * device pins in the datasheet. 1428 */ 1429struct regulator *regulator_get(struct device *dev, const char *id) 1430{ 1431 return _regulator_get(dev, id, false, true); 1432} 1433EXPORT_SYMBOL_GPL(regulator_get); 1434 1435/** 1436 * regulator_get_exclusive - obtain exclusive access to a regulator. 1437 * @dev: device for regulator "consumer" 1438 * @id: Supply name or regulator ID. 1439 * 1440 * Returns a struct regulator corresponding to the regulator producer, 1441 * or IS_ERR() condition containing errno. Other consumers will be 1442 * unable to obtain this regulator while this reference is held and the 1443 * use count for the regulator will be initialised to reflect the current 1444 * state of the regulator. 1445 * 1446 * This is intended for use by consumers which cannot tolerate shared 1447 * use of the regulator such as those which need to force the 1448 * regulator off for correct operation of the hardware they are 1449 * controlling. 1450 * 1451 * Use of supply names configured via regulator_set_device_supply() is 1452 * strongly encouraged. It is recommended that the supply name used 1453 * should match the name used for the supply and/or the relevant 1454 * device pins in the datasheet. 1455 */ 1456struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1457{ 1458 return _regulator_get(dev, id, true, false); 1459} 1460EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1461 1462/** 1463 * regulator_get_optional - obtain optional access to a regulator. 1464 * @dev: device for regulator "consumer" 1465 * @id: Supply name or regulator ID. 1466 * 1467 * Returns a struct regulator corresponding to the regulator producer, 1468 * or IS_ERR() condition containing errno. 1469 * 1470 * This is intended for use by consumers for devices which can have 1471 * some supplies unconnected in normal use, such as some MMC devices. 1472 * It can allow the regulator core to provide stub supplies for other 1473 * supplies requested using normal regulator_get() calls without 1474 * disrupting the operation of drivers that can handle absent 1475 * supplies. 1476 * 1477 * Use of supply names configured via regulator_set_device_supply() is 1478 * strongly encouraged. It is recommended that the supply name used 1479 * should match the name used for the supply and/or the relevant 1480 * device pins in the datasheet. 1481 */ 1482struct regulator *regulator_get_optional(struct device *dev, const char *id) 1483{ 1484 return _regulator_get(dev, id, false, false); 1485} 1486EXPORT_SYMBOL_GPL(regulator_get_optional); 1487 1488/* Locks held by regulator_put() */ 1489static void _regulator_put(struct regulator *regulator) 1490{ 1491 struct regulator_dev *rdev; 1492 1493 if (regulator == NULL || IS_ERR(regulator)) 1494 return; 1495 1496 rdev = regulator->rdev; 1497 1498 debugfs_remove_recursive(regulator->debugfs); 1499 1500 /* remove any sysfs entries */ 1501 if (regulator->dev) 1502 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1503 kfree(regulator->supply_name); 1504 list_del(®ulator->list); 1505 kfree(regulator); 1506 1507 rdev->open_count--; 1508 rdev->exclusive = 0; 1509 1510 module_put(rdev->owner); 1511} 1512 1513/** 1514 * regulator_put - "free" the regulator source 1515 * @regulator: regulator source 1516 * 1517 * Note: drivers must ensure that all regulator_enable calls made on this 1518 * regulator source are balanced by regulator_disable calls prior to calling 1519 * this function. 1520 */ 1521void regulator_put(struct regulator *regulator) 1522{ 1523 mutex_lock(®ulator_list_mutex); 1524 _regulator_put(regulator); 1525 mutex_unlock(®ulator_list_mutex); 1526} 1527EXPORT_SYMBOL_GPL(regulator_put); 1528 1529/** 1530 * regulator_register_supply_alias - Provide device alias for supply lookup 1531 * 1532 * @dev: device that will be given as the regulator "consumer" 1533 * @id: Supply name or regulator ID 1534 * @alias_dev: device that should be used to lookup the supply 1535 * @alias_id: Supply name or regulator ID that should be used to lookup the 1536 * supply 1537 * 1538 * All lookups for id on dev will instead be conducted for alias_id on 1539 * alias_dev. 1540 */ 1541int regulator_register_supply_alias(struct device *dev, const char *id, 1542 struct device *alias_dev, 1543 const char *alias_id) 1544{ 1545 struct regulator_supply_alias *map; 1546 1547 map = regulator_find_supply_alias(dev, id); 1548 if (map) 1549 return -EEXIST; 1550 1551 map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); 1552 if (!map) 1553 return -ENOMEM; 1554 1555 map->src_dev = dev; 1556 map->src_supply = id; 1557 map->alias_dev = alias_dev; 1558 map->alias_supply = alias_id; 1559 1560 list_add(&map->list, ®ulator_supply_alias_list); 1561 1562 pr_info("Adding alias for supply %s,%s -> %s,%s\n", 1563 id, dev_name(dev), alias_id, dev_name(alias_dev)); 1564 1565 return 0; 1566} 1567EXPORT_SYMBOL_GPL(regulator_register_supply_alias); 1568 1569/** 1570 * regulator_unregister_supply_alias - Remove device alias 1571 * 1572 * @dev: device that will be given as the regulator "consumer" 1573 * @id: Supply name or regulator ID 1574 * 1575 * Remove a lookup alias if one exists for id on dev. 1576 */ 1577void regulator_unregister_supply_alias(struct device *dev, const char *id) 1578{ 1579 struct regulator_supply_alias *map; 1580 1581 map = regulator_find_supply_alias(dev, id); 1582 if (map) { 1583 list_del(&map->list); 1584 kfree(map); 1585 } 1586} 1587EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); 1588 1589/** 1590 * regulator_bulk_register_supply_alias - register multiple aliases 1591 * 1592 * @dev: device that will be given as the regulator "consumer" 1593 * @id: List of supply names or regulator IDs 1594 * @alias_dev: device that should be used to lookup the supply 1595 * @alias_id: List of supply names or regulator IDs that should be used to 1596 * lookup the supply 1597 * @num_id: Number of aliases to register 1598 * 1599 * @return 0 on success, an errno on failure. 1600 * 1601 * This helper function allows drivers to register several supply 1602 * aliases in one operation. If any of the aliases cannot be 1603 * registered any aliases that were registered will be removed 1604 * before returning to the caller. 1605 */ 1606int regulator_bulk_register_supply_alias(struct device *dev, 1607 const char *const *id, 1608 struct device *alias_dev, 1609 const char *const *alias_id, 1610 int num_id) 1611{ 1612 int i; 1613 int ret; 1614 1615 for (i = 0; i < num_id; ++i) { 1616 ret = regulator_register_supply_alias(dev, id[i], alias_dev, 1617 alias_id[i]); 1618 if (ret < 0) 1619 goto err; 1620 } 1621 1622 return 0; 1623 1624err: 1625 dev_err(dev, 1626 "Failed to create supply alias %s,%s -> %s,%s\n", 1627 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); 1628 1629 while (--i >= 0) 1630 regulator_unregister_supply_alias(dev, id[i]); 1631 1632 return ret; 1633} 1634EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); 1635 1636/** 1637 * regulator_bulk_unregister_supply_alias - unregister multiple aliases 1638 * 1639 * @dev: device that will be given as the regulator "consumer" 1640 * @id: List of supply names or regulator IDs 1641 * @num_id: Number of aliases to unregister 1642 * 1643 * This helper function allows drivers to unregister several supply 1644 * aliases in one operation. 1645 */ 1646void regulator_bulk_unregister_supply_alias(struct device *dev, 1647 const char *const *id, 1648 int num_id) 1649{ 1650 int i; 1651 1652 for (i = 0; i < num_id; ++i) 1653 regulator_unregister_supply_alias(dev, id[i]); 1654} 1655EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); 1656 1657 1658/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1659static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1660 const struct regulator_config *config) 1661{ 1662 struct regulator_enable_gpio *pin; 1663 int ret; 1664 1665 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1666 if (pin->gpio == config->ena_gpio) { 1667 rdev_dbg(rdev, "GPIO %d is already used\n", 1668 config->ena_gpio); 1669 goto update_ena_gpio_to_rdev; 1670 } 1671 } 1672 1673 ret = gpio_request_one(config->ena_gpio, 1674 GPIOF_DIR_OUT | config->ena_gpio_flags, 1675 rdev_get_name(rdev)); 1676 if (ret) 1677 return ret; 1678 1679 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1680 if (pin == NULL) { 1681 gpio_free(config->ena_gpio); 1682 return -ENOMEM; 1683 } 1684 1685 pin->gpio = config->ena_gpio; 1686 pin->ena_gpio_invert = config->ena_gpio_invert; 1687 list_add(&pin->list, ®ulator_ena_gpio_list); 1688 1689update_ena_gpio_to_rdev: 1690 pin->request_count++; 1691 rdev->ena_pin = pin; 1692 return 0; 1693} 1694 1695static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1696{ 1697 struct regulator_enable_gpio *pin, *n; 1698 1699 if (!rdev->ena_pin) 1700 return; 1701 1702 /* Free the GPIO only in case of no use */ 1703 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1704 if (pin->gpio == rdev->ena_pin->gpio) { 1705 if (pin->request_count <= 1) { 1706 pin->request_count = 0; 1707 gpio_free(pin->gpio); 1708 list_del(&pin->list); 1709 kfree(pin); 1710 } else { 1711 pin->request_count--; 1712 } 1713 } 1714 } 1715} 1716 1717/** 1718 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1719 * @rdev: regulator_dev structure 1720 * @enable: enable GPIO at initial use? 1721 * 1722 * GPIO is enabled in case of initial use. (enable_count is 0) 1723 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1724 */ 1725static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1726{ 1727 struct regulator_enable_gpio *pin = rdev->ena_pin; 1728 1729 if (!pin) 1730 return -EINVAL; 1731 1732 if (enable) { 1733 /* Enable GPIO at initial use */ 1734 if (pin->enable_count == 0) 1735 gpio_set_value_cansleep(pin->gpio, 1736 !pin->ena_gpio_invert); 1737 1738 pin->enable_count++; 1739 } else { 1740 if (pin->enable_count > 1) { 1741 pin->enable_count--; 1742 return 0; 1743 } 1744 1745 /* Disable GPIO if not used */ 1746 if (pin->enable_count <= 1) { 1747 gpio_set_value_cansleep(pin->gpio, 1748 pin->ena_gpio_invert); 1749 pin->enable_count = 0; 1750 } 1751 } 1752 1753 return 0; 1754} 1755 1756static int _regulator_do_enable(struct regulator_dev *rdev) 1757{ 1758 int ret, delay; 1759 1760 /* Query before enabling in case configuration dependent. */ 1761 ret = _regulator_get_enable_time(rdev); 1762 if (ret >= 0) { 1763 delay = ret; 1764 } else { 1765 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1766 delay = 0; 1767 } 1768 1769 trace_regulator_enable(rdev_get_name(rdev)); 1770 1771 if (rdev->ena_pin) { 1772 ret = regulator_ena_gpio_ctrl(rdev, true); 1773 if (ret < 0) 1774 return ret; 1775 rdev->ena_gpio_state = 1; 1776 } else if (rdev->desc->ops->enable) { 1777 ret = rdev->desc->ops->enable(rdev); 1778 if (ret < 0) 1779 return ret; 1780 } else { 1781 return -EINVAL; 1782 } 1783 1784 /* Allow the regulator to ramp; it would be useful to extend 1785 * this for bulk operations so that the regulators can ramp 1786 * together. */ 1787 trace_regulator_enable_delay(rdev_get_name(rdev)); 1788 1789 /* 1790 * Delay for the requested amount of time as per the guidelines in: 1791 * 1792 * Documentation/timers/timers-howto.txt 1793 * 1794 * The assumption here is that regulators will never be enabled in 1795 * atomic context and therefore sleeping functions can be used. 1796 */ 1797 if (delay) { 1798 unsigned int ms = delay / 1000; 1799 unsigned int us = delay % 1000; 1800 1801 if (ms > 0) { 1802 /* 1803 * For small enough values, handle super-millisecond 1804 * delays in the usleep_range() call below. 1805 */ 1806 if (ms < 20) 1807 us += ms * 1000; 1808 else 1809 msleep(ms); 1810 } 1811 1812 /* 1813 * Give the scheduler some room to coalesce with any other 1814 * wakeup sources. For delays shorter than 10 us, don't even 1815 * bother setting up high-resolution timers and just busy- 1816 * loop. 1817 */ 1818 if (us >= 10) 1819 usleep_range(us, us + 100); 1820 else 1821 udelay(us); 1822 } 1823 1824 trace_regulator_enable_complete(rdev_get_name(rdev)); 1825 1826 return 0; 1827} 1828 1829/* locks held by regulator_enable() */ 1830static int _regulator_enable(struct regulator_dev *rdev) 1831{ 1832 int ret; 1833 1834 /* check voltage and requested load before enabling */ 1835 if (rdev->constraints && 1836 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1837 drms_uA_update(rdev); 1838 1839 if (rdev->use_count == 0) { 1840 /* The regulator may on if it's not switchable or left on */ 1841 ret = _regulator_is_enabled(rdev); 1842 if (ret == -EINVAL || ret == 0) { 1843 if (!_regulator_can_change_status(rdev)) 1844 return -EPERM; 1845 1846 ret = _regulator_do_enable(rdev); 1847 if (ret < 0) 1848 return ret; 1849 1850 } else if (ret < 0) { 1851 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1852 return ret; 1853 } 1854 /* Fallthrough on positive return values - already enabled */ 1855 } 1856 1857 rdev->use_count++; 1858 1859 return 0; 1860} 1861 1862/** 1863 * regulator_enable - enable regulator output 1864 * @regulator: regulator source 1865 * 1866 * Request that the regulator be enabled with the regulator output at 1867 * the predefined voltage or current value. Calls to regulator_enable() 1868 * must be balanced with calls to regulator_disable(). 1869 * 1870 * NOTE: the output value can be set by other drivers, boot loader or may be 1871 * hardwired in the regulator. 1872 */ 1873int regulator_enable(struct regulator *regulator) 1874{ 1875 struct regulator_dev *rdev = regulator->rdev; 1876 int ret = 0; 1877 1878 if (regulator->always_on) 1879 return 0; 1880 1881 if (rdev->supply) { 1882 ret = regulator_enable(rdev->supply); 1883 if (ret != 0) 1884 return ret; 1885 } 1886 1887 mutex_lock(&rdev->mutex); 1888 ret = _regulator_enable(rdev); 1889 mutex_unlock(&rdev->mutex); 1890 1891 if (ret != 0 && rdev->supply) 1892 regulator_disable(rdev->supply); 1893 1894 return ret; 1895} 1896EXPORT_SYMBOL_GPL(regulator_enable); 1897 1898static int _regulator_do_disable(struct regulator_dev *rdev) 1899{ 1900 int ret; 1901 1902 trace_regulator_disable(rdev_get_name(rdev)); 1903 1904 if (rdev->ena_pin) { 1905 ret = regulator_ena_gpio_ctrl(rdev, false); 1906 if (ret < 0) 1907 return ret; 1908 rdev->ena_gpio_state = 0; 1909 1910 } else if (rdev->desc->ops->disable) { 1911 ret = rdev->desc->ops->disable(rdev); 1912 if (ret != 0) 1913 return ret; 1914 } 1915 1916 trace_regulator_disable_complete(rdev_get_name(rdev)); 1917 1918 return 0; 1919} 1920 1921/* locks held by regulator_disable() */ 1922static int _regulator_disable(struct regulator_dev *rdev) 1923{ 1924 int ret = 0; 1925 1926 if (WARN(rdev->use_count <= 0, 1927 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1928 return -EIO; 1929 1930 /* are we the last user and permitted to disable ? */ 1931 if (rdev->use_count == 1 && 1932 (rdev->constraints && !rdev->constraints->always_on)) { 1933 1934 /* we are last user */ 1935 if (_regulator_can_change_status(rdev)) { 1936 ret = _regulator_do_disable(rdev); 1937 if (ret < 0) { 1938 rdev_err(rdev, "failed to disable\n"); 1939 return ret; 1940 } 1941 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1942 NULL); 1943 } 1944 1945 rdev->use_count = 0; 1946 } else if (rdev->use_count > 1) { 1947 1948 if (rdev->constraints && 1949 (rdev->constraints->valid_ops_mask & 1950 REGULATOR_CHANGE_DRMS)) 1951 drms_uA_update(rdev); 1952 1953 rdev->use_count--; 1954 } 1955 1956 return ret; 1957} 1958 1959/** 1960 * regulator_disable - disable regulator output 1961 * @regulator: regulator source 1962 * 1963 * Disable the regulator output voltage or current. Calls to 1964 * regulator_enable() must be balanced with calls to 1965 * regulator_disable(). 1966 * 1967 * NOTE: this will only disable the regulator output if no other consumer 1968 * devices have it enabled, the regulator device supports disabling and 1969 * machine constraints permit this operation. 1970 */ 1971int regulator_disable(struct regulator *regulator) 1972{ 1973 struct regulator_dev *rdev = regulator->rdev; 1974 int ret = 0; 1975 1976 if (regulator->always_on) 1977 return 0; 1978 1979 mutex_lock(&rdev->mutex); 1980 ret = _regulator_disable(rdev); 1981 mutex_unlock(&rdev->mutex); 1982 1983 if (ret == 0 && rdev->supply) 1984 regulator_disable(rdev->supply); 1985 1986 return ret; 1987} 1988EXPORT_SYMBOL_GPL(regulator_disable); 1989 1990/* locks held by regulator_force_disable() */ 1991static int _regulator_force_disable(struct regulator_dev *rdev) 1992{ 1993 int ret = 0; 1994 1995 ret = _regulator_do_disable(rdev); 1996 if (ret < 0) { 1997 rdev_err(rdev, "failed to force disable\n"); 1998 return ret; 1999 } 2000 2001 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 2002 REGULATOR_EVENT_DISABLE, NULL); 2003 2004 return 0; 2005} 2006 2007/** 2008 * regulator_force_disable - force disable regulator output 2009 * @regulator: regulator source 2010 * 2011 * Forcibly disable the regulator output voltage or current. 2012 * NOTE: this *will* disable the regulator output even if other consumer 2013 * devices have it enabled. This should be used for situations when device 2014 * damage will likely occur if the regulator is not disabled (e.g. over temp). 2015 */ 2016int regulator_force_disable(struct regulator *regulator) 2017{ 2018 struct regulator_dev *rdev = regulator->rdev; 2019 int ret; 2020 2021 mutex_lock(&rdev->mutex); 2022 regulator->uA_load = 0; 2023 ret = _regulator_force_disable(regulator->rdev); 2024 mutex_unlock(&rdev->mutex); 2025 2026 if (rdev->supply) 2027 while (rdev->open_count--) 2028 regulator_disable(rdev->supply); 2029 2030 return ret; 2031} 2032EXPORT_SYMBOL_GPL(regulator_force_disable); 2033 2034static void regulator_disable_work(struct work_struct *work) 2035{ 2036 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 2037 disable_work.work); 2038 int count, i, ret; 2039 2040 mutex_lock(&rdev->mutex); 2041 2042 BUG_ON(!rdev->deferred_disables); 2043 2044 count = rdev->deferred_disables; 2045 rdev->deferred_disables = 0; 2046 2047 for (i = 0; i < count; i++) { 2048 ret = _regulator_disable(rdev); 2049 if (ret != 0) 2050 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 2051 } 2052 2053 mutex_unlock(&rdev->mutex); 2054 2055 if (rdev->supply) { 2056 for (i = 0; i < count; i++) { 2057 ret = regulator_disable(rdev->supply); 2058 if (ret != 0) { 2059 rdev_err(rdev, 2060 "Supply disable failed: %d\n", ret); 2061 } 2062 } 2063 } 2064} 2065 2066/** 2067 * regulator_disable_deferred - disable regulator output with delay 2068 * @regulator: regulator source 2069 * @ms: miliseconds until the regulator is disabled 2070 * 2071 * Execute regulator_disable() on the regulator after a delay. This 2072 * is intended for use with devices that require some time to quiesce. 2073 * 2074 * NOTE: this will only disable the regulator output if no other consumer 2075 * devices have it enabled, the regulator device supports disabling and 2076 * machine constraints permit this operation. 2077 */ 2078int regulator_disable_deferred(struct regulator *regulator, int ms) 2079{ 2080 struct regulator_dev *rdev = regulator->rdev; 2081 int ret; 2082 2083 if (regulator->always_on) 2084 return 0; 2085 2086 if (!ms) 2087 return regulator_disable(regulator); 2088 2089 mutex_lock(&rdev->mutex); 2090 rdev->deferred_disables++; 2091 mutex_unlock(&rdev->mutex); 2092 2093 ret = queue_delayed_work(system_power_efficient_wq, 2094 &rdev->disable_work, 2095 msecs_to_jiffies(ms)); 2096 if (ret < 0) 2097 return ret; 2098 else 2099 return 0; 2100} 2101EXPORT_SYMBOL_GPL(regulator_disable_deferred); 2102 2103static int _regulator_is_enabled(struct regulator_dev *rdev) 2104{ 2105 /* A GPIO control always takes precedence */ 2106 if (rdev->ena_pin) 2107 return rdev->ena_gpio_state; 2108 2109 /* If we don't know then assume that the regulator is always on */ 2110 if (!rdev->desc->ops->is_enabled) 2111 return 1; 2112 2113 return rdev->desc->ops->is_enabled(rdev); 2114} 2115 2116/** 2117 * regulator_is_enabled - is the regulator output enabled 2118 * @regulator: regulator source 2119 * 2120 * Returns positive if the regulator driver backing the source/client 2121 * has requested that the device be enabled, zero if it hasn't, else a 2122 * negative errno code. 2123 * 2124 * Note that the device backing this regulator handle can have multiple 2125 * users, so it might be enabled even if regulator_enable() was never 2126 * called for this particular source. 2127 */ 2128int regulator_is_enabled(struct regulator *regulator) 2129{ 2130 int ret; 2131 2132 if (regulator->always_on) 2133 return 1; 2134 2135 mutex_lock(®ulator->rdev->mutex); 2136 ret = _regulator_is_enabled(regulator->rdev); 2137 mutex_unlock(®ulator->rdev->mutex); 2138 2139 return ret; 2140} 2141EXPORT_SYMBOL_GPL(regulator_is_enabled); 2142 2143/** 2144 * regulator_can_change_voltage - check if regulator can change voltage 2145 * @regulator: regulator source 2146 * 2147 * Returns positive if the regulator driver backing the source/client 2148 * can change its voltage, false otherwise. Useful for detecting fixed 2149 * or dummy regulators and disabling voltage change logic in the client 2150 * driver. 2151 */ 2152int regulator_can_change_voltage(struct regulator *regulator) 2153{ 2154 struct regulator_dev *rdev = regulator->rdev; 2155 2156 if (rdev->constraints && 2157 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2158 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2159 return 1; 2160 2161 if (rdev->desc->continuous_voltage_range && 2162 rdev->constraints->min_uV && rdev->constraints->max_uV && 2163 rdev->constraints->min_uV != rdev->constraints->max_uV) 2164 return 1; 2165 } 2166 2167 return 0; 2168} 2169EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2170 2171/** 2172 * regulator_count_voltages - count regulator_list_voltage() selectors 2173 * @regulator: regulator source 2174 * 2175 * Returns number of selectors, or negative errno. Selectors are 2176 * numbered starting at zero, and typically correspond to bitfields 2177 * in hardware registers. 2178 */ 2179int regulator_count_voltages(struct regulator *regulator) 2180{ 2181 struct regulator_dev *rdev = regulator->rdev; 2182 2183 return rdev->desc->n_voltages ? : -EINVAL; 2184} 2185EXPORT_SYMBOL_GPL(regulator_count_voltages); 2186 2187/** 2188 * regulator_list_voltage - enumerate supported voltages 2189 * @regulator: regulator source 2190 * @selector: identify voltage to list 2191 * Context: can sleep 2192 * 2193 * Returns a voltage that can be passed to @regulator_set_voltage(), 2194 * zero if this selector code can't be used on this system, or a 2195 * negative errno. 2196 */ 2197int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2198{ 2199 struct regulator_dev *rdev = regulator->rdev; 2200 struct regulator_ops *ops = rdev->desc->ops; 2201 int ret; 2202 2203 if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) 2204 return rdev->desc->fixed_uV; 2205 2206 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2207 return -EINVAL; 2208 2209 mutex_lock(&rdev->mutex); 2210 ret = ops->list_voltage(rdev, selector); 2211 mutex_unlock(&rdev->mutex); 2212 2213 if (ret > 0) { 2214 if (ret < rdev->constraints->min_uV) 2215 ret = 0; 2216 else if (ret > rdev->constraints->max_uV) 2217 ret = 0; 2218 } 2219 2220 return ret; 2221} 2222EXPORT_SYMBOL_GPL(regulator_list_voltage); 2223 2224/** 2225 * regulator_get_regmap - get the regulator's register map 2226 * @regulator: regulator source 2227 * 2228 * Returns the register map for the given regulator, or an ERR_PTR value 2229 * if the regulator doesn't use regmap. 2230 */ 2231struct regmap *regulator_get_regmap(struct regulator *regulator) 2232{ 2233 struct regmap *map = regulator->rdev->regmap; 2234 2235 return map ? map : ERR_PTR(-EOPNOTSUPP); 2236} 2237 2238/** 2239 * regulator_get_hardware_vsel_register - get the HW voltage selector register 2240 * @regulator: regulator source 2241 * @vsel_reg: voltage selector register, output parameter 2242 * @vsel_mask: mask for voltage selector bitfield, output parameter 2243 * 2244 * Returns the hardware register offset and bitmask used for setting the 2245 * regulator voltage. This might be useful when configuring voltage-scaling 2246 * hardware or firmware that can make I2C requests behind the kernel's back, 2247 * for example. 2248 * 2249 * On success, the output parameters @vsel_reg and @vsel_mask are filled in 2250 * and 0 is returned, otherwise a negative errno is returned. 2251 */ 2252int regulator_get_hardware_vsel_register(struct regulator *regulator, 2253 unsigned *vsel_reg, 2254 unsigned *vsel_mask) 2255{ 2256 struct regulator_dev *rdev = regulator->rdev; 2257 struct regulator_ops *ops = rdev->desc->ops; 2258 2259 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) 2260 return -EOPNOTSUPP; 2261 2262 *vsel_reg = rdev->desc->vsel_reg; 2263 *vsel_mask = rdev->desc->vsel_mask; 2264 2265 return 0; 2266} 2267EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); 2268 2269/** 2270 * regulator_list_hardware_vsel - get the HW-specific register value for a selector 2271 * @regulator: regulator source 2272 * @selector: identify voltage to list 2273 * 2274 * Converts the selector to a hardware-specific voltage selector that can be 2275 * directly written to the regulator registers. The address of the voltage 2276 * register can be determined by calling @regulator_get_hardware_vsel_register. 2277 * 2278 * On error a negative errno is returned. 2279 */ 2280int regulator_list_hardware_vsel(struct regulator *regulator, 2281 unsigned selector) 2282{ 2283 struct regulator_dev *rdev = regulator->rdev; 2284 struct regulator_ops *ops = rdev->desc->ops; 2285 2286 if (selector >= rdev->desc->n_voltages) 2287 return -EINVAL; 2288 if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) 2289 return -EOPNOTSUPP; 2290 2291 return selector; 2292} 2293EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); 2294 2295/** 2296 * regulator_get_linear_step - return the voltage step size between VSEL values 2297 * @regulator: regulator source 2298 * 2299 * Returns the voltage step size between VSEL values for linear 2300 * regulators, or return 0 if the regulator isn't a linear regulator. 2301 */ 2302unsigned int regulator_get_linear_step(struct regulator *regulator) 2303{ 2304 struct regulator_dev *rdev = regulator->rdev; 2305 2306 return rdev->desc->uV_step; 2307} 2308EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2309 2310/** 2311 * regulator_is_supported_voltage - check if a voltage range can be supported 2312 * 2313 * @regulator: Regulator to check. 2314 * @min_uV: Minimum required voltage in uV. 2315 * @max_uV: Maximum required voltage in uV. 2316 * 2317 * Returns a boolean or a negative error code. 2318 */ 2319int regulator_is_supported_voltage(struct regulator *regulator, 2320 int min_uV, int max_uV) 2321{ 2322 struct regulator_dev *rdev = regulator->rdev; 2323 int i, voltages, ret; 2324 2325 /* If we can't change voltage check the current voltage */ 2326 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2327 ret = regulator_get_voltage(regulator); 2328 if (ret >= 0) 2329 return min_uV <= ret && ret <= max_uV; 2330 else 2331 return ret; 2332 } 2333 2334 /* Any voltage within constrains range is fine? */ 2335 if (rdev->desc->continuous_voltage_range) 2336 return min_uV >= rdev->constraints->min_uV && 2337 max_uV <= rdev->constraints->max_uV; 2338 2339 ret = regulator_count_voltages(regulator); 2340 if (ret < 0) 2341 return ret; 2342 voltages = ret; 2343 2344 for (i = 0; i < voltages; i++) { 2345 ret = regulator_list_voltage(regulator, i); 2346 2347 if (ret >= min_uV && ret <= max_uV) 2348 return 1; 2349 } 2350 2351 return 0; 2352} 2353EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2354 2355static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2356 int min_uV, int max_uV) 2357{ 2358 int ret; 2359 int delay = 0; 2360 int best_val = 0; 2361 unsigned int selector; 2362 int old_selector = -1; 2363 2364 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2365 2366 min_uV += rdev->constraints->uV_offset; 2367 max_uV += rdev->constraints->uV_offset; 2368 2369 /* 2370 * If we can't obtain the old selector there is not enough 2371 * info to call set_voltage_time_sel(). 2372 */ 2373 if (_regulator_is_enabled(rdev) && 2374 rdev->desc->ops->set_voltage_time_sel && 2375 rdev->desc->ops->get_voltage_sel) { 2376 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2377 if (old_selector < 0) 2378 return old_selector; 2379 } 2380 2381 if (rdev->desc->ops->set_voltage) { 2382 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2383 &selector); 2384 2385 if (ret >= 0) { 2386 if (rdev->desc->ops->list_voltage) 2387 best_val = rdev->desc->ops->list_voltage(rdev, 2388 selector); 2389 else 2390 best_val = _regulator_get_voltage(rdev); 2391 } 2392 2393 } else if (rdev->desc->ops->set_voltage_sel) { 2394 if (rdev->desc->ops->map_voltage) { 2395 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2396 max_uV); 2397 } else { 2398 if (rdev->desc->ops->list_voltage == 2399 regulator_list_voltage_linear) 2400 ret = regulator_map_voltage_linear(rdev, 2401 min_uV, max_uV); 2402 else if (rdev->desc->ops->list_voltage == 2403 regulator_list_voltage_linear_range) 2404 ret = regulator_map_voltage_linear_range(rdev, 2405 min_uV, max_uV); 2406 else 2407 ret = regulator_map_voltage_iterate(rdev, 2408 min_uV, max_uV); 2409 } 2410 2411 if (ret >= 0) { 2412 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2413 if (min_uV <= best_val && max_uV >= best_val) { 2414 selector = ret; 2415 if (old_selector == selector) 2416 ret = 0; 2417 else 2418 ret = rdev->desc->ops->set_voltage_sel( 2419 rdev, ret); 2420 } else { 2421 ret = -EINVAL; 2422 } 2423 } 2424 } else { 2425 ret = -EINVAL; 2426 } 2427 2428 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2429 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2430 && old_selector != selector) { 2431 2432 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2433 old_selector, selector); 2434 if (delay < 0) { 2435 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2436 delay); 2437 delay = 0; 2438 } 2439 2440 /* Insert any necessary delays */ 2441 if (delay >= 1000) { 2442 mdelay(delay / 1000); 2443 udelay(delay % 1000); 2444 } else if (delay) { 2445 udelay(delay); 2446 } 2447 } 2448 2449 if (ret == 0 && best_val >= 0) { 2450 unsigned long data = best_val; 2451 2452 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2453 (void *)data); 2454 } 2455 2456 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2457 2458 return ret; 2459} 2460 2461/** 2462 * regulator_set_voltage - set regulator output voltage 2463 * @regulator: regulator source 2464 * @min_uV: Minimum required voltage in uV 2465 * @max_uV: Maximum acceptable voltage in uV 2466 * 2467 * Sets a voltage regulator to the desired output voltage. This can be set 2468 * during any regulator state. IOW, regulator can be disabled or enabled. 2469 * 2470 * If the regulator is enabled then the voltage will change to the new value 2471 * immediately otherwise if the regulator is disabled the regulator will 2472 * output at the new voltage when enabled. 2473 * 2474 * NOTE: If the regulator is shared between several devices then the lowest 2475 * request voltage that meets the system constraints will be used. 2476 * Regulator system constraints must be set for this regulator before 2477 * calling this function otherwise this call will fail. 2478 */ 2479int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2480{ 2481 struct regulator_dev *rdev = regulator->rdev; 2482 int ret = 0; 2483 int old_min_uV, old_max_uV; 2484 int current_uV; 2485 2486 mutex_lock(&rdev->mutex); 2487 2488 /* If we're setting the same range as last time the change 2489 * should be a noop (some cpufreq implementations use the same 2490 * voltage for multiple frequencies, for example). 2491 */ 2492 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2493 goto out; 2494 2495 /* If we're trying to set a range that overlaps the current voltage, 2496 * return succesfully even though the regulator does not support 2497 * changing the voltage. 2498 */ 2499 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2500 current_uV = _regulator_get_voltage(rdev); 2501 if (min_uV <= current_uV && current_uV <= max_uV) { 2502 regulator->min_uV = min_uV; 2503 regulator->max_uV = max_uV; 2504 goto out; 2505 } 2506 } 2507 2508 /* sanity check */ 2509 if (!rdev->desc->ops->set_voltage && 2510 !rdev->desc->ops->set_voltage_sel) { 2511 ret = -EINVAL; 2512 goto out; 2513 } 2514 2515 /* constraints check */ 2516 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2517 if (ret < 0) 2518 goto out; 2519 2520 /* restore original values in case of error */ 2521 old_min_uV = regulator->min_uV; 2522 old_max_uV = regulator->max_uV; 2523 regulator->min_uV = min_uV; 2524 regulator->max_uV = max_uV; 2525 2526 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2527 if (ret < 0) 2528 goto out2; 2529 2530 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2531 if (ret < 0) 2532 goto out2; 2533 2534out: 2535 mutex_unlock(&rdev->mutex); 2536 return ret; 2537out2: 2538 regulator->min_uV = old_min_uV; 2539 regulator->max_uV = old_max_uV; 2540 mutex_unlock(&rdev->mutex); 2541 return ret; 2542} 2543EXPORT_SYMBOL_GPL(regulator_set_voltage); 2544 2545/** 2546 * regulator_set_voltage_time - get raise/fall time 2547 * @regulator: regulator source 2548 * @old_uV: starting voltage in microvolts 2549 * @new_uV: target voltage in microvolts 2550 * 2551 * Provided with the starting and ending voltage, this function attempts to 2552 * calculate the time in microseconds required to rise or fall to this new 2553 * voltage. 2554 */ 2555int regulator_set_voltage_time(struct regulator *regulator, 2556 int old_uV, int new_uV) 2557{ 2558 struct regulator_dev *rdev = regulator->rdev; 2559 struct regulator_ops *ops = rdev->desc->ops; 2560 int old_sel = -1; 2561 int new_sel = -1; 2562 int voltage; 2563 int i; 2564 2565 /* Currently requires operations to do this */ 2566 if (!ops->list_voltage || !ops->set_voltage_time_sel 2567 || !rdev->desc->n_voltages) 2568 return -EINVAL; 2569 2570 for (i = 0; i < rdev->desc->n_voltages; i++) { 2571 /* We only look for exact voltage matches here */ 2572 voltage = regulator_list_voltage(regulator, i); 2573 if (voltage < 0) 2574 return -EINVAL; 2575 if (voltage == 0) 2576 continue; 2577 if (voltage == old_uV) 2578 old_sel = i; 2579 if (voltage == new_uV) 2580 new_sel = i; 2581 } 2582 2583 if (old_sel < 0 || new_sel < 0) 2584 return -EINVAL; 2585 2586 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2587} 2588EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2589 2590/** 2591 * regulator_set_voltage_time_sel - get raise/fall time 2592 * @rdev: regulator source device 2593 * @old_selector: selector for starting voltage 2594 * @new_selector: selector for target voltage 2595 * 2596 * Provided with the starting and target voltage selectors, this function 2597 * returns time in microseconds required to rise or fall to this new voltage 2598 * 2599 * Drivers providing ramp_delay in regulation_constraints can use this as their 2600 * set_voltage_time_sel() operation. 2601 */ 2602int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2603 unsigned int old_selector, 2604 unsigned int new_selector) 2605{ 2606 unsigned int ramp_delay = 0; 2607 int old_volt, new_volt; 2608 2609 if (rdev->constraints->ramp_delay) 2610 ramp_delay = rdev->constraints->ramp_delay; 2611 else if (rdev->desc->ramp_delay) 2612 ramp_delay = rdev->desc->ramp_delay; 2613 2614 if (ramp_delay == 0) { 2615 rdev_warn(rdev, "ramp_delay not set\n"); 2616 return 0; 2617 } 2618 2619 /* sanity check */ 2620 if (!rdev->desc->ops->list_voltage) 2621 return -EINVAL; 2622 2623 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2624 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2625 2626 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2627} 2628EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2629 2630/** 2631 * regulator_sync_voltage - re-apply last regulator output voltage 2632 * @regulator: regulator source 2633 * 2634 * Re-apply the last configured voltage. This is intended to be used 2635 * where some external control source the consumer is cooperating with 2636 * has caused the configured voltage to change. 2637 */ 2638int regulator_sync_voltage(struct regulator *regulator) 2639{ 2640 struct regulator_dev *rdev = regulator->rdev; 2641 int ret, min_uV, max_uV; 2642 2643 mutex_lock(&rdev->mutex); 2644 2645 if (!rdev->desc->ops->set_voltage && 2646 !rdev->desc->ops->set_voltage_sel) { 2647 ret = -EINVAL; 2648 goto out; 2649 } 2650 2651 /* This is only going to work if we've had a voltage configured. */ 2652 if (!regulator->min_uV && !regulator->max_uV) { 2653 ret = -EINVAL; 2654 goto out; 2655 } 2656 2657 min_uV = regulator->min_uV; 2658 max_uV = regulator->max_uV; 2659 2660 /* This should be a paranoia check... */ 2661 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2662 if (ret < 0) 2663 goto out; 2664 2665 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2666 if (ret < 0) 2667 goto out; 2668 2669 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2670 2671out: 2672 mutex_unlock(&rdev->mutex); 2673 return ret; 2674} 2675EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2676 2677static int _regulator_get_voltage(struct regulator_dev *rdev) 2678{ 2679 int sel, ret; 2680 2681 if (rdev->desc->ops->get_voltage_sel) { 2682 sel = rdev->desc->ops->get_voltage_sel(rdev); 2683 if (sel < 0) 2684 return sel; 2685 ret = rdev->desc->ops->list_voltage(rdev, sel); 2686 } else if (rdev->desc->ops->get_voltage) { 2687 ret = rdev->desc->ops->get_voltage(rdev); 2688 } else if (rdev->desc->ops->list_voltage) { 2689 ret = rdev->desc->ops->list_voltage(rdev, 0); 2690 } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { 2691 ret = rdev->desc->fixed_uV; 2692 } else { 2693 return -EINVAL; 2694 } 2695 2696 if (ret < 0) 2697 return ret; 2698 return ret - rdev->constraints->uV_offset; 2699} 2700 2701/** 2702 * regulator_get_voltage - get regulator output voltage 2703 * @regulator: regulator source 2704 * 2705 * This returns the current regulator voltage in uV. 2706 * 2707 * NOTE: If the regulator is disabled it will return the voltage value. This 2708 * function should not be used to determine regulator state. 2709 */ 2710int regulator_get_voltage(struct regulator *regulator) 2711{ 2712 int ret; 2713 2714 mutex_lock(®ulator->rdev->mutex); 2715 2716 ret = _regulator_get_voltage(regulator->rdev); 2717 2718 mutex_unlock(®ulator->rdev->mutex); 2719 2720 return ret; 2721} 2722EXPORT_SYMBOL_GPL(regulator_get_voltage); 2723 2724/** 2725 * regulator_set_current_limit - set regulator output current limit 2726 * @regulator: regulator source 2727 * @min_uA: Minimum supported current in uA 2728 * @max_uA: Maximum supported current in uA 2729 * 2730 * Sets current sink to the desired output current. This can be set during 2731 * any regulator state. IOW, regulator can be disabled or enabled. 2732 * 2733 * If the regulator is enabled then the current will change to the new value 2734 * immediately otherwise if the regulator is disabled the regulator will 2735 * output at the new current when enabled. 2736 * 2737 * NOTE: Regulator system constraints must be set for this regulator before 2738 * calling this function otherwise this call will fail. 2739 */ 2740int regulator_set_current_limit(struct regulator *regulator, 2741 int min_uA, int max_uA) 2742{ 2743 struct regulator_dev *rdev = regulator->rdev; 2744 int ret; 2745 2746 mutex_lock(&rdev->mutex); 2747 2748 /* sanity check */ 2749 if (!rdev->desc->ops->set_current_limit) { 2750 ret = -EINVAL; 2751 goto out; 2752 } 2753 2754 /* constraints check */ 2755 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2756 if (ret < 0) 2757 goto out; 2758 2759 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2760out: 2761 mutex_unlock(&rdev->mutex); 2762 return ret; 2763} 2764EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2765 2766static int _regulator_get_current_limit(struct regulator_dev *rdev) 2767{ 2768 int ret; 2769 2770 mutex_lock(&rdev->mutex); 2771 2772 /* sanity check */ 2773 if (!rdev->desc->ops->get_current_limit) { 2774 ret = -EINVAL; 2775 goto out; 2776 } 2777 2778 ret = rdev->desc->ops->get_current_limit(rdev); 2779out: 2780 mutex_unlock(&rdev->mutex); 2781 return ret; 2782} 2783 2784/** 2785 * regulator_get_current_limit - get regulator output current 2786 * @regulator: regulator source 2787 * 2788 * This returns the current supplied by the specified current sink in uA. 2789 * 2790 * NOTE: If the regulator is disabled it will return the current value. This 2791 * function should not be used to determine regulator state. 2792 */ 2793int regulator_get_current_limit(struct regulator *regulator) 2794{ 2795 return _regulator_get_current_limit(regulator->rdev); 2796} 2797EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2798 2799/** 2800 * regulator_set_mode - set regulator operating mode 2801 * @regulator: regulator source 2802 * @mode: operating mode - one of the REGULATOR_MODE constants 2803 * 2804 * Set regulator operating mode to increase regulator efficiency or improve 2805 * regulation performance. 2806 * 2807 * NOTE: Regulator system constraints must be set for this regulator before 2808 * calling this function otherwise this call will fail. 2809 */ 2810int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2811{ 2812 struct regulator_dev *rdev = regulator->rdev; 2813 int ret; 2814 int regulator_curr_mode; 2815 2816 mutex_lock(&rdev->mutex); 2817 2818 /* sanity check */ 2819 if (!rdev->desc->ops->set_mode) { 2820 ret = -EINVAL; 2821 goto out; 2822 } 2823 2824 /* return if the same mode is requested */ 2825 if (rdev->desc->ops->get_mode) { 2826 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2827 if (regulator_curr_mode == mode) { 2828 ret = 0; 2829 goto out; 2830 } 2831 } 2832 2833 /* constraints check */ 2834 ret = regulator_mode_constrain(rdev, &mode); 2835 if (ret < 0) 2836 goto out; 2837 2838 ret = rdev->desc->ops->set_mode(rdev, mode); 2839out: 2840 mutex_unlock(&rdev->mutex); 2841 return ret; 2842} 2843EXPORT_SYMBOL_GPL(regulator_set_mode); 2844 2845static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2846{ 2847 int ret; 2848 2849 mutex_lock(&rdev->mutex); 2850 2851 /* sanity check */ 2852 if (!rdev->desc->ops->get_mode) { 2853 ret = -EINVAL; 2854 goto out; 2855 } 2856 2857 ret = rdev->desc->ops->get_mode(rdev); 2858out: 2859 mutex_unlock(&rdev->mutex); 2860 return ret; 2861} 2862 2863/** 2864 * regulator_get_mode - get regulator operating mode 2865 * @regulator: regulator source 2866 * 2867 * Get the current regulator operating mode. 2868 */ 2869unsigned int regulator_get_mode(struct regulator *regulator) 2870{ 2871 return _regulator_get_mode(regulator->rdev); 2872} 2873EXPORT_SYMBOL_GPL(regulator_get_mode); 2874 2875/** 2876 * regulator_set_optimum_mode - set regulator optimum operating mode 2877 * @regulator: regulator source 2878 * @uA_load: load current 2879 * 2880 * Notifies the regulator core of a new device load. This is then used by 2881 * DRMS (if enabled by constraints) to set the most efficient regulator 2882 * operating mode for the new regulator loading. 2883 * 2884 * Consumer devices notify their supply regulator of the maximum power 2885 * they will require (can be taken from device datasheet in the power 2886 * consumption tables) when they change operational status and hence power 2887 * state. Examples of operational state changes that can affect power 2888 * consumption are :- 2889 * 2890 * o Device is opened / closed. 2891 * o Device I/O is about to begin or has just finished. 2892 * o Device is idling in between work. 2893 * 2894 * This information is also exported via sysfs to userspace. 2895 * 2896 * DRMS will sum the total requested load on the regulator and change 2897 * to the most efficient operating mode if platform constraints allow. 2898 * 2899 * Returns the new regulator mode or error. 2900 */ 2901int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2902{ 2903 struct regulator_dev *rdev = regulator->rdev; 2904 struct regulator *consumer; 2905 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2906 unsigned int mode; 2907 2908 if (rdev->supply) 2909 input_uV = regulator_get_voltage(rdev->supply); 2910 2911 mutex_lock(&rdev->mutex); 2912 2913 /* 2914 * first check to see if we can set modes at all, otherwise just 2915 * tell the consumer everything is OK. 2916 */ 2917 regulator->uA_load = uA_load; 2918 ret = regulator_check_drms(rdev); 2919 if (ret < 0) { 2920 ret = 0; 2921 goto out; 2922 } 2923 2924 if (!rdev->desc->ops->get_optimum_mode) 2925 goto out; 2926 2927 /* 2928 * we can actually do this so any errors are indicators of 2929 * potential real failure. 2930 */ 2931 ret = -EINVAL; 2932 2933 if (!rdev->desc->ops->set_mode) 2934 goto out; 2935 2936 /* get output voltage */ 2937 output_uV = _regulator_get_voltage(rdev); 2938 if (output_uV <= 0) { 2939 rdev_err(rdev, "invalid output voltage found\n"); 2940 goto out; 2941 } 2942 2943 /* No supply? Use constraint voltage */ 2944 if (input_uV <= 0) 2945 input_uV = rdev->constraints->input_uV; 2946 if (input_uV <= 0) { 2947 rdev_err(rdev, "invalid input voltage found\n"); 2948 goto out; 2949 } 2950 2951 /* calc total requested load for this regulator */ 2952 list_for_each_entry(consumer, &rdev->consumer_list, list) 2953 total_uA_load += consumer->uA_load; 2954 2955 mode = rdev->desc->ops->get_optimum_mode(rdev, 2956 input_uV, output_uV, 2957 total_uA_load); 2958 ret = regulator_mode_constrain(rdev, &mode); 2959 if (ret < 0) { 2960 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2961 total_uA_load, input_uV, output_uV); 2962 goto out; 2963 } 2964 2965 ret = rdev->desc->ops->set_mode(rdev, mode); 2966 if (ret < 0) { 2967 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2968 goto out; 2969 } 2970 ret = mode; 2971out: 2972 mutex_unlock(&rdev->mutex); 2973 return ret; 2974} 2975EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2976 2977/** 2978 * regulator_allow_bypass - allow the regulator to go into bypass mode 2979 * 2980 * @regulator: Regulator to configure 2981 * @enable: enable or disable bypass mode 2982 * 2983 * Allow the regulator to go into bypass mode if all other consumers 2984 * for the regulator also enable bypass mode and the machine 2985 * constraints allow this. Bypass mode means that the regulator is 2986 * simply passing the input directly to the output with no regulation. 2987 */ 2988int regulator_allow_bypass(struct regulator *regulator, bool enable) 2989{ 2990 struct regulator_dev *rdev = regulator->rdev; 2991 int ret = 0; 2992 2993 if (!rdev->desc->ops->set_bypass) 2994 return 0; 2995 2996 if (rdev->constraints && 2997 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2998 return 0; 2999 3000 mutex_lock(&rdev->mutex); 3001 3002 if (enable && !regulator->bypass) { 3003 rdev->bypass_count++; 3004 3005 if (rdev->bypass_count == rdev->open_count) { 3006 ret = rdev->desc->ops->set_bypass(rdev, enable); 3007 if (ret != 0) 3008 rdev->bypass_count--; 3009 } 3010 3011 } else if (!enable && regulator->bypass) { 3012 rdev->bypass_count--; 3013 3014 if (rdev->bypass_count != rdev->open_count) { 3015 ret = rdev->desc->ops->set_bypass(rdev, enable); 3016 if (ret != 0) 3017 rdev->bypass_count++; 3018 } 3019 } 3020 3021 if (ret == 0) 3022 regulator->bypass = enable; 3023 3024 mutex_unlock(&rdev->mutex); 3025 3026 return ret; 3027} 3028EXPORT_SYMBOL_GPL(regulator_allow_bypass); 3029 3030/** 3031 * regulator_register_notifier - register regulator event notifier 3032 * @regulator: regulator source 3033 * @nb: notifier block 3034 * 3035 * Register notifier block to receive regulator events. 3036 */ 3037int regulator_register_notifier(struct regulator *regulator, 3038 struct notifier_block *nb) 3039{ 3040 return blocking_notifier_chain_register(®ulator->rdev->notifier, 3041 nb); 3042} 3043EXPORT_SYMBOL_GPL(regulator_register_notifier); 3044 3045/** 3046 * regulator_unregister_notifier - unregister regulator event notifier 3047 * @regulator: regulator source 3048 * @nb: notifier block 3049 * 3050 * Unregister regulator event notifier block. 3051 */ 3052int regulator_unregister_notifier(struct regulator *regulator, 3053 struct notifier_block *nb) 3054{ 3055 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 3056 nb); 3057} 3058EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 3059 3060/* notify regulator consumers and downstream regulator consumers. 3061 * Note mutex must be held by caller. 3062 */ 3063static void _notifier_call_chain(struct regulator_dev *rdev, 3064 unsigned long event, void *data) 3065{ 3066 /* call rdev chain first */ 3067 blocking_notifier_call_chain(&rdev->notifier, event, data); 3068} 3069 3070/** 3071 * regulator_bulk_get - get multiple regulator consumers 3072 * 3073 * @dev: Device to supply 3074 * @num_consumers: Number of consumers to register 3075 * @consumers: Configuration of consumers; clients are stored here. 3076 * 3077 * @return 0 on success, an errno on failure. 3078 * 3079 * This helper function allows drivers to get several regulator 3080 * consumers in one operation. If any of the regulators cannot be 3081 * acquired then any regulators that were allocated will be freed 3082 * before returning to the caller. 3083 */ 3084int regulator_bulk_get(struct device *dev, int num_consumers, 3085 struct regulator_bulk_data *consumers) 3086{ 3087 int i; 3088 int ret; 3089 3090 for (i = 0; i < num_consumers; i++) 3091 consumers[i].consumer = NULL; 3092 3093 for (i = 0; i < num_consumers; i++) { 3094 consumers[i].consumer = regulator_get(dev, 3095 consumers[i].supply); 3096 if (IS_ERR(consumers[i].consumer)) { 3097 ret = PTR_ERR(consumers[i].consumer); 3098 dev_err(dev, "Failed to get supply '%s': %d\n", 3099 consumers[i].supply, ret); 3100 consumers[i].consumer = NULL; 3101 goto err; 3102 } 3103 } 3104 3105 return 0; 3106 3107err: 3108 while (--i >= 0) 3109 regulator_put(consumers[i].consumer); 3110 3111 return ret; 3112} 3113EXPORT_SYMBOL_GPL(regulator_bulk_get); 3114 3115static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3116{ 3117 struct regulator_bulk_data *bulk = data; 3118 3119 bulk->ret = regulator_enable(bulk->consumer); 3120} 3121 3122/** 3123 * regulator_bulk_enable - enable multiple regulator consumers 3124 * 3125 * @num_consumers: Number of consumers 3126 * @consumers: Consumer data; clients are stored here. 3127 * @return 0 on success, an errno on failure 3128 * 3129 * This convenience API allows consumers to enable multiple regulator 3130 * clients in a single API call. If any consumers cannot be enabled 3131 * then any others that were enabled will be disabled again prior to 3132 * return. 3133 */ 3134int regulator_bulk_enable(int num_consumers, 3135 struct regulator_bulk_data *consumers) 3136{ 3137 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3138 int i; 3139 int ret = 0; 3140 3141 for (i = 0; i < num_consumers; i++) { 3142 if (consumers[i].consumer->always_on) 3143 consumers[i].ret = 0; 3144 else 3145 async_schedule_domain(regulator_bulk_enable_async, 3146 &consumers[i], &async_domain); 3147 } 3148 3149 async_synchronize_full_domain(&async_domain); 3150 3151 /* If any consumer failed we need to unwind any that succeeded */ 3152 for (i = 0; i < num_consumers; i++) { 3153 if (consumers[i].ret != 0) { 3154 ret = consumers[i].ret; 3155 goto err; 3156 } 3157 } 3158 3159 return 0; 3160 3161err: 3162 for (i = 0; i < num_consumers; i++) { 3163 if (consumers[i].ret < 0) 3164 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3165 consumers[i].ret); 3166 else 3167 regulator_disable(consumers[i].consumer); 3168 } 3169 3170 return ret; 3171} 3172EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3173 3174/** 3175 * regulator_bulk_disable - disable multiple regulator consumers 3176 * 3177 * @num_consumers: Number of consumers 3178 * @consumers: Consumer data; clients are stored here. 3179 * @return 0 on success, an errno on failure 3180 * 3181 * This convenience API allows consumers to disable multiple regulator 3182 * clients in a single API call. If any consumers cannot be disabled 3183 * then any others that were disabled will be enabled again prior to 3184 * return. 3185 */ 3186int regulator_bulk_disable(int num_consumers, 3187 struct regulator_bulk_data *consumers) 3188{ 3189 int i; 3190 int ret, r; 3191 3192 for (i = num_consumers - 1; i >= 0; --i) { 3193 ret = regulator_disable(consumers[i].consumer); 3194 if (ret != 0) 3195 goto err; 3196 } 3197 3198 return 0; 3199 3200err: 3201 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3202 for (++i; i < num_consumers; ++i) { 3203 r = regulator_enable(consumers[i].consumer); 3204 if (r != 0) 3205 pr_err("Failed to reename %s: %d\n", 3206 consumers[i].supply, r); 3207 } 3208 3209 return ret; 3210} 3211EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3212 3213/** 3214 * regulator_bulk_force_disable - force disable multiple regulator consumers 3215 * 3216 * @num_consumers: Number of consumers 3217 * @consumers: Consumer data; clients are stored here. 3218 * @return 0 on success, an errno on failure 3219 * 3220 * This convenience API allows consumers to forcibly disable multiple regulator 3221 * clients in a single API call. 3222 * NOTE: This should be used for situations when device damage will 3223 * likely occur if the regulators are not disabled (e.g. over temp). 3224 * Although regulator_force_disable function call for some consumers can 3225 * return error numbers, the function is called for all consumers. 3226 */ 3227int regulator_bulk_force_disable(int num_consumers, 3228 struct regulator_bulk_data *consumers) 3229{ 3230 int i; 3231 int ret; 3232 3233 for (i = 0; i < num_consumers; i++) 3234 consumers[i].ret = 3235 regulator_force_disable(consumers[i].consumer); 3236 3237 for (i = 0; i < num_consumers; i++) { 3238 if (consumers[i].ret != 0) { 3239 ret = consumers[i].ret; 3240 goto out; 3241 } 3242 } 3243 3244 return 0; 3245out: 3246 return ret; 3247} 3248EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3249 3250/** 3251 * regulator_bulk_free - free multiple regulator consumers 3252 * 3253 * @num_consumers: Number of consumers 3254 * @consumers: Consumer data; clients are stored here. 3255 * 3256 * This convenience API allows consumers to free multiple regulator 3257 * clients in a single API call. 3258 */ 3259void regulator_bulk_free(int num_consumers, 3260 struct regulator_bulk_data *consumers) 3261{ 3262 int i; 3263 3264 for (i = 0; i < num_consumers; i++) { 3265 regulator_put(consumers[i].consumer); 3266 consumers[i].consumer = NULL; 3267 } 3268} 3269EXPORT_SYMBOL_GPL(regulator_bulk_free); 3270 3271/** 3272 * regulator_notifier_call_chain - call regulator event notifier 3273 * @rdev: regulator source 3274 * @event: notifier block 3275 * @data: callback-specific data. 3276 * 3277 * Called by regulator drivers to notify clients a regulator event has 3278 * occurred. We also notify regulator clients downstream. 3279 * Note lock must be held by caller. 3280 */ 3281int regulator_notifier_call_chain(struct regulator_dev *rdev, 3282 unsigned long event, void *data) 3283{ 3284 _notifier_call_chain(rdev, event, data); 3285 return NOTIFY_DONE; 3286 3287} 3288EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3289 3290/** 3291 * regulator_mode_to_status - convert a regulator mode into a status 3292 * 3293 * @mode: Mode to convert 3294 * 3295 * Convert a regulator mode into a status. 3296 */ 3297int regulator_mode_to_status(unsigned int mode) 3298{ 3299 switch (mode) { 3300 case REGULATOR_MODE_FAST: 3301 return REGULATOR_STATUS_FAST; 3302 case REGULATOR_MODE_NORMAL: 3303 return REGULATOR_STATUS_NORMAL; 3304 case REGULATOR_MODE_IDLE: 3305 return REGULATOR_STATUS_IDLE; 3306 case REGULATOR_MODE_STANDBY: 3307 return REGULATOR_STATUS_STANDBY; 3308 default: 3309 return REGULATOR_STATUS_UNDEFINED; 3310 } 3311} 3312EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3313 3314/* 3315 * To avoid cluttering sysfs (and memory) with useless state, only 3316 * create attributes that can be meaningfully displayed. 3317 */ 3318static int add_regulator_attributes(struct regulator_dev *rdev) 3319{ 3320 struct device *dev = &rdev->dev; 3321 struct regulator_ops *ops = rdev->desc->ops; 3322 int status = 0; 3323 3324 /* some attributes need specific methods to be displayed */ 3325 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3326 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3327 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) || 3328 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) { 3329 status = device_create_file(dev, &dev_attr_microvolts); 3330 if (status < 0) 3331 return status; 3332 } 3333 if (ops->get_current_limit) { 3334 status = device_create_file(dev, &dev_attr_microamps); 3335 if (status < 0) 3336 return status; 3337 } 3338 if (ops->get_mode) { 3339 status = device_create_file(dev, &dev_attr_opmode); 3340 if (status < 0) 3341 return status; 3342 } 3343 if (rdev->ena_pin || ops->is_enabled) { 3344 status = device_create_file(dev, &dev_attr_state); 3345 if (status < 0) 3346 return status; 3347 } 3348 if (ops->get_status) { 3349 status = device_create_file(dev, &dev_attr_status); 3350 if (status < 0) 3351 return status; 3352 } 3353 if (ops->get_bypass) { 3354 status = device_create_file(dev, &dev_attr_bypass); 3355 if (status < 0) 3356 return status; 3357 } 3358 3359 /* some attributes are type-specific */ 3360 if (rdev->desc->type == REGULATOR_CURRENT) { 3361 status = device_create_file(dev, &dev_attr_requested_microamps); 3362 if (status < 0) 3363 return status; 3364 } 3365 3366 /* all the other attributes exist to support constraints; 3367 * don't show them if there are no constraints, or if the 3368 * relevant supporting methods are missing. 3369 */ 3370 if (!rdev->constraints) 3371 return status; 3372 3373 /* constraints need specific supporting methods */ 3374 if (ops->set_voltage || ops->set_voltage_sel) { 3375 status = device_create_file(dev, &dev_attr_min_microvolts); 3376 if (status < 0) 3377 return status; 3378 status = device_create_file(dev, &dev_attr_max_microvolts); 3379 if (status < 0) 3380 return status; 3381 } 3382 if (ops->set_current_limit) { 3383 status = device_create_file(dev, &dev_attr_min_microamps); 3384 if (status < 0) 3385 return status; 3386 status = device_create_file(dev, &dev_attr_max_microamps); 3387 if (status < 0) 3388 return status; 3389 } 3390 3391 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3392 if (status < 0) 3393 return status; 3394 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3395 if (status < 0) 3396 return status; 3397 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3398 if (status < 0) 3399 return status; 3400 3401 if (ops->set_suspend_voltage) { 3402 status = device_create_file(dev, 3403 &dev_attr_suspend_standby_microvolts); 3404 if (status < 0) 3405 return status; 3406 status = device_create_file(dev, 3407 &dev_attr_suspend_mem_microvolts); 3408 if (status < 0) 3409 return status; 3410 status = device_create_file(dev, 3411 &dev_attr_suspend_disk_microvolts); 3412 if (status < 0) 3413 return status; 3414 } 3415 3416 if (ops->set_suspend_mode) { 3417 status = device_create_file(dev, 3418 &dev_attr_suspend_standby_mode); 3419 if (status < 0) 3420 return status; 3421 status = device_create_file(dev, 3422 &dev_attr_suspend_mem_mode); 3423 if (status < 0) 3424 return status; 3425 status = device_create_file(dev, 3426 &dev_attr_suspend_disk_mode); 3427 if (status < 0) 3428 return status; 3429 } 3430 3431 return status; 3432} 3433 3434static void rdev_init_debugfs(struct regulator_dev *rdev) 3435{ 3436 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3437 if (!rdev->debugfs) { 3438 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3439 return; 3440 } 3441 3442 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3443 &rdev->use_count); 3444 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3445 &rdev->open_count); 3446 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3447 &rdev->bypass_count); 3448} 3449 3450/** 3451 * regulator_register - register regulator 3452 * @regulator_desc: regulator to register 3453 * @config: runtime configuration for regulator 3454 * 3455 * Called by regulator drivers to register a regulator. 3456 * Returns a valid pointer to struct regulator_dev on success 3457 * or an ERR_PTR() on error. 3458 */ 3459struct regulator_dev * 3460regulator_register(const struct regulator_desc *regulator_desc, 3461 const struct regulator_config *config) 3462{ 3463 const struct regulation_constraints *constraints = NULL; 3464 const struct regulator_init_data *init_data; 3465 static atomic_t regulator_no = ATOMIC_INIT(0); 3466 struct regulator_dev *rdev; 3467 struct device *dev; 3468 int ret, i; 3469 const char *supply = NULL; 3470 3471 if (regulator_desc == NULL || config == NULL) 3472 return ERR_PTR(-EINVAL); 3473 3474 dev = config->dev; 3475 WARN_ON(!dev); 3476 3477 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3478 return ERR_PTR(-EINVAL); 3479 3480 if (regulator_desc->type != REGULATOR_VOLTAGE && 3481 regulator_desc->type != REGULATOR_CURRENT) 3482 return ERR_PTR(-EINVAL); 3483 3484 /* Only one of each should be implemented */ 3485 WARN_ON(regulator_desc->ops->get_voltage && 3486 regulator_desc->ops->get_voltage_sel); 3487 WARN_ON(regulator_desc->ops->set_voltage && 3488 regulator_desc->ops->set_voltage_sel); 3489 3490 /* If we're using selectors we must implement list_voltage. */ 3491 if (regulator_desc->ops->get_voltage_sel && 3492 !regulator_desc->ops->list_voltage) { 3493 return ERR_PTR(-EINVAL); 3494 } 3495 if (regulator_desc->ops->set_voltage_sel && 3496 !regulator_desc->ops->list_voltage) { 3497 return ERR_PTR(-EINVAL); 3498 } 3499 3500 init_data = config->init_data; 3501 3502 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3503 if (rdev == NULL) 3504 return ERR_PTR(-ENOMEM); 3505 3506 mutex_lock(®ulator_list_mutex); 3507 3508 mutex_init(&rdev->mutex); 3509 rdev->reg_data = config->driver_data; 3510 rdev->owner = regulator_desc->owner; 3511 rdev->desc = regulator_desc; 3512 if (config->regmap) 3513 rdev->regmap = config->regmap; 3514 else if (dev_get_regmap(dev, NULL)) 3515 rdev->regmap = dev_get_regmap(dev, NULL); 3516 else if (dev->parent) 3517 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3518 INIT_LIST_HEAD(&rdev->consumer_list); 3519 INIT_LIST_HEAD(&rdev->list); 3520 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3521 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3522 3523 /* preform any regulator specific init */ 3524 if (init_data && init_data->regulator_init) { 3525 ret = init_data->regulator_init(rdev->reg_data); 3526 if (ret < 0) 3527 goto clean; 3528 } 3529 3530 /* register with sysfs */ 3531 rdev->dev.class = ®ulator_class; 3532 rdev->dev.of_node = of_node_get(config->of_node); 3533 rdev->dev.parent = dev; 3534 dev_set_name(&rdev->dev, "regulator.%d", 3535 atomic_inc_return(®ulator_no) - 1); 3536 ret = device_register(&rdev->dev); 3537 if (ret != 0) { 3538 put_device(&rdev->dev); 3539 goto clean; 3540 } 3541 3542 dev_set_drvdata(&rdev->dev, rdev); 3543 3544 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3545 ret = regulator_ena_gpio_request(rdev, config); 3546 if (ret != 0) { 3547 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3548 config->ena_gpio, ret); 3549 goto wash; 3550 } 3551 3552 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3553 rdev->ena_gpio_state = 1; 3554 3555 if (config->ena_gpio_invert) 3556 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3557 } 3558 3559 /* set regulator constraints */ 3560 if (init_data) 3561 constraints = &init_data->constraints; 3562 3563 ret = set_machine_constraints(rdev, constraints); 3564 if (ret < 0) 3565 goto scrub; 3566 3567 /* add attributes supported by this regulator */ 3568 ret = add_regulator_attributes(rdev); 3569 if (ret < 0) 3570 goto scrub; 3571 3572 if (init_data && init_data->supply_regulator) 3573 supply = init_data->supply_regulator; 3574 else if (regulator_desc->supply_name) 3575 supply = regulator_desc->supply_name; 3576 3577 if (supply) { 3578 struct regulator_dev *r; 3579 3580 r = regulator_dev_lookup(dev, supply, &ret); 3581 3582 if (ret == -ENODEV) { 3583 /* 3584 * No supply was specified for this regulator and 3585 * there will never be one. 3586 */ 3587 ret = 0; 3588 goto add_dev; 3589 } else if (!r) { 3590 dev_err(dev, "Failed to find supply %s\n", supply); 3591 ret = -EPROBE_DEFER; 3592 goto scrub; 3593 } 3594 3595 ret = set_supply(rdev, r); 3596 if (ret < 0) 3597 goto scrub; 3598 3599 /* Enable supply if rail is enabled */ 3600 if (_regulator_is_enabled(rdev)) { 3601 ret = regulator_enable(rdev->supply); 3602 if (ret < 0) 3603 goto scrub; 3604 } 3605 } 3606 3607add_dev: 3608 /* add consumers devices */ 3609 if (init_data) { 3610 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3611 ret = set_consumer_device_supply(rdev, 3612 init_data->consumer_supplies[i].dev_name, 3613 init_data->consumer_supplies[i].supply); 3614 if (ret < 0) { 3615 dev_err(dev, "Failed to set supply %s\n", 3616 init_data->consumer_supplies[i].supply); 3617 goto unset_supplies; 3618 } 3619 } 3620 } 3621 3622 list_add(&rdev->list, ®ulator_list); 3623 3624 rdev_init_debugfs(rdev); 3625out: 3626 mutex_unlock(®ulator_list_mutex); 3627 return rdev; 3628 3629unset_supplies: 3630 unset_regulator_supplies(rdev); 3631 3632scrub: 3633 if (rdev->supply) 3634 _regulator_put(rdev->supply); 3635 regulator_ena_gpio_free(rdev); 3636 kfree(rdev->constraints); 3637wash: 3638 device_unregister(&rdev->dev); 3639 /* device core frees rdev */ 3640 rdev = ERR_PTR(ret); 3641 goto out; 3642 3643clean: 3644 kfree(rdev); 3645 rdev = ERR_PTR(ret); 3646 goto out; 3647} 3648EXPORT_SYMBOL_GPL(regulator_register); 3649 3650/** 3651 * regulator_unregister - unregister regulator 3652 * @rdev: regulator to unregister 3653 * 3654 * Called by regulator drivers to unregister a regulator. 3655 */ 3656void regulator_unregister(struct regulator_dev *rdev) 3657{ 3658 if (rdev == NULL) 3659 return; 3660 3661 if (rdev->supply) { 3662 while (rdev->use_count--) 3663 regulator_disable(rdev->supply); 3664 regulator_put(rdev->supply); 3665 } 3666 mutex_lock(®ulator_list_mutex); 3667 debugfs_remove_recursive(rdev->debugfs); 3668 flush_work(&rdev->disable_work.work); 3669 WARN_ON(rdev->open_count); 3670 unset_regulator_supplies(rdev); 3671 list_del(&rdev->list); 3672 kfree(rdev->constraints); 3673 regulator_ena_gpio_free(rdev); 3674 of_node_put(rdev->dev.of_node); 3675 device_unregister(&rdev->dev); 3676 mutex_unlock(®ulator_list_mutex); 3677} 3678EXPORT_SYMBOL_GPL(regulator_unregister); 3679 3680/** 3681 * regulator_suspend_prepare - prepare regulators for system wide suspend 3682 * @state: system suspend state 3683 * 3684 * Configure each regulator with it's suspend operating parameters for state. 3685 * This will usually be called by machine suspend code prior to supending. 3686 */ 3687int regulator_suspend_prepare(suspend_state_t state) 3688{ 3689 struct regulator_dev *rdev; 3690 int ret = 0; 3691 3692 /* ON is handled by regulator active state */ 3693 if (state == PM_SUSPEND_ON) 3694 return -EINVAL; 3695 3696 mutex_lock(®ulator_list_mutex); 3697 list_for_each_entry(rdev, ®ulator_list, list) { 3698 3699 mutex_lock(&rdev->mutex); 3700 ret = suspend_prepare(rdev, state); 3701 mutex_unlock(&rdev->mutex); 3702 3703 if (ret < 0) { 3704 rdev_err(rdev, "failed to prepare\n"); 3705 goto out; 3706 } 3707 } 3708out: 3709 mutex_unlock(®ulator_list_mutex); 3710 return ret; 3711} 3712EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3713 3714/** 3715 * regulator_suspend_finish - resume regulators from system wide suspend 3716 * 3717 * Turn on regulators that might be turned off by regulator_suspend_prepare 3718 * and that should be turned on according to the regulators properties. 3719 */ 3720int regulator_suspend_finish(void) 3721{ 3722 struct regulator_dev *rdev; 3723 int ret = 0, error; 3724 3725 mutex_lock(®ulator_list_mutex); 3726 list_for_each_entry(rdev, ®ulator_list, list) { 3727 mutex_lock(&rdev->mutex); 3728 if (rdev->use_count > 0 || rdev->constraints->always_on) { 3729 error = _regulator_do_enable(rdev); 3730 if (error) 3731 ret = error; 3732 } else { 3733 if (!have_full_constraints()) 3734 goto unlock; 3735 if (!_regulator_is_enabled(rdev)) 3736 goto unlock; 3737 3738 error = _regulator_do_disable(rdev); 3739 if (error) 3740 ret = error; 3741 } 3742unlock: 3743 mutex_unlock(&rdev->mutex); 3744 } 3745 mutex_unlock(®ulator_list_mutex); 3746 return ret; 3747} 3748EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3749 3750/** 3751 * regulator_has_full_constraints - the system has fully specified constraints 3752 * 3753 * Calling this function will cause the regulator API to disable all 3754 * regulators which have a zero use count and don't have an always_on 3755 * constraint in a late_initcall. 3756 * 3757 * The intention is that this will become the default behaviour in a 3758 * future kernel release so users are encouraged to use this facility 3759 * now. 3760 */ 3761void regulator_has_full_constraints(void) 3762{ 3763 has_full_constraints = 1; 3764} 3765EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3766 3767/** 3768 * rdev_get_drvdata - get rdev regulator driver data 3769 * @rdev: regulator 3770 * 3771 * Get rdev regulator driver private data. This call can be used in the 3772 * regulator driver context. 3773 */ 3774void *rdev_get_drvdata(struct regulator_dev *rdev) 3775{ 3776 return rdev->reg_data; 3777} 3778EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3779 3780/** 3781 * regulator_get_drvdata - get regulator driver data 3782 * @regulator: regulator 3783 * 3784 * Get regulator driver private data. This call can be used in the consumer 3785 * driver context when non API regulator specific functions need to be called. 3786 */ 3787void *regulator_get_drvdata(struct regulator *regulator) 3788{ 3789 return regulator->rdev->reg_data; 3790} 3791EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3792 3793/** 3794 * regulator_set_drvdata - set regulator driver data 3795 * @regulator: regulator 3796 * @data: data 3797 */ 3798void regulator_set_drvdata(struct regulator *regulator, void *data) 3799{ 3800 regulator->rdev->reg_data = data; 3801} 3802EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3803 3804/** 3805 * regulator_get_id - get regulator ID 3806 * @rdev: regulator 3807 */ 3808int rdev_get_id(struct regulator_dev *rdev) 3809{ 3810 return rdev->desc->id; 3811} 3812EXPORT_SYMBOL_GPL(rdev_get_id); 3813 3814struct device *rdev_get_dev(struct regulator_dev *rdev) 3815{ 3816 return &rdev->dev; 3817} 3818EXPORT_SYMBOL_GPL(rdev_get_dev); 3819 3820void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3821{ 3822 return reg_init_data->driver_data; 3823} 3824EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3825 3826#ifdef CONFIG_DEBUG_FS 3827static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3828 size_t count, loff_t *ppos) 3829{ 3830 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3831 ssize_t len, ret = 0; 3832 struct regulator_map *map; 3833 3834 if (!buf) 3835 return -ENOMEM; 3836 3837 list_for_each_entry(map, ®ulator_map_list, list) { 3838 len = snprintf(buf + ret, PAGE_SIZE - ret, 3839 "%s -> %s.%s\n", 3840 rdev_get_name(map->regulator), map->dev_name, 3841 map->supply); 3842 if (len >= 0) 3843 ret += len; 3844 if (ret > PAGE_SIZE) { 3845 ret = PAGE_SIZE; 3846 break; 3847 } 3848 } 3849 3850 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3851 3852 kfree(buf); 3853 3854 return ret; 3855} 3856#endif 3857 3858static const struct file_operations supply_map_fops = { 3859#ifdef CONFIG_DEBUG_FS 3860 .read = supply_map_read_file, 3861 .llseek = default_llseek, 3862#endif 3863}; 3864 3865static int __init regulator_init(void) 3866{ 3867 int ret; 3868 3869 ret = class_register(®ulator_class); 3870 3871 debugfs_root = debugfs_create_dir("regulator", NULL); 3872 if (!debugfs_root) 3873 pr_warn("regulator: Failed to create debugfs directory\n"); 3874 3875 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3876 &supply_map_fops); 3877 3878 regulator_dummy_init(); 3879 3880 return ret; 3881} 3882 3883/* init early to allow our consumers to complete system booting */ 3884core_initcall(regulator_init); 3885 3886static int __init regulator_init_complete(void) 3887{ 3888 struct regulator_dev *rdev; 3889 struct regulator_ops *ops; 3890 struct regulation_constraints *c; 3891 int enabled, ret; 3892 3893 /* 3894 * Since DT doesn't provide an idiomatic mechanism for 3895 * enabling full constraints and since it's much more natural 3896 * with DT to provide them just assume that a DT enabled 3897 * system has full constraints. 3898 */ 3899 if (of_have_populated_dt()) 3900 has_full_constraints = true; 3901 3902 mutex_lock(®ulator_list_mutex); 3903 3904 /* If we have a full configuration then disable any regulators 3905 * we have permission to change the status for and which are 3906 * not in use or always_on. This is effectively the default 3907 * for DT and ACPI as they have full constraints. 3908 */ 3909 list_for_each_entry(rdev, ®ulator_list, list) { 3910 ops = rdev->desc->ops; 3911 c = rdev->constraints; 3912 3913 if (c && c->always_on) 3914 continue; 3915 3916 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS)) 3917 continue; 3918 3919 mutex_lock(&rdev->mutex); 3920 3921 if (rdev->use_count) 3922 goto unlock; 3923 3924 /* If we can't read the status assume it's on. */ 3925 if (ops->is_enabled) 3926 enabled = ops->is_enabled(rdev); 3927 else 3928 enabled = 1; 3929 3930 if (!enabled) 3931 goto unlock; 3932 3933 if (have_full_constraints()) { 3934 /* We log since this may kill the system if it 3935 * goes wrong. */ 3936 rdev_info(rdev, "disabling\n"); 3937 ret = _regulator_do_disable(rdev); 3938 if (ret != 0) 3939 rdev_err(rdev, "couldn't disable: %d\n", ret); 3940 } else { 3941 /* The intention is that in future we will 3942 * assume that full constraints are provided 3943 * so warn even if we aren't going to do 3944 * anything here. 3945 */ 3946 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3947 } 3948 3949unlock: 3950 mutex_unlock(&rdev->mutex); 3951 } 3952 3953 mutex_unlock(®ulator_list_mutex); 3954 3955 return 0; 3956} 3957late_initcall_sync(regulator_init_complete); 3958