core.c revision df36793115b4f68181877a1c89bac54feadd965d
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 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static bool has_full_constraints; 55static bool board_wants_dummy_regulator; 56 57static struct dentry *debugfs_root; 58 59/* 60 * struct regulator_map 61 * 62 * Used to provide symbolic supply names to devices. 63 */ 64struct regulator_map { 65 struct list_head list; 66 const char *dev_name; /* The dev_name() for the consumer */ 67 const char *supply; 68 struct regulator_dev *regulator; 69}; 70 71/* 72 * struct regulator 73 * 74 * One for each consumer device. 75 */ 76struct regulator { 77 struct device *dev; 78 struct list_head list; 79 unsigned int always_on:1; 80 unsigned int bypass:1; 81 int uA_load; 82 int min_uV; 83 int max_uV; 84 char *supply_name; 85 struct device_attribute dev_attr; 86 struct regulator_dev *rdev; 87 struct dentry *debugfs; 88}; 89 90static int _regulator_is_enabled(struct regulator_dev *rdev); 91static int _regulator_disable(struct regulator_dev *rdev); 92static int _regulator_get_voltage(struct regulator_dev *rdev); 93static int _regulator_get_current_limit(struct regulator_dev *rdev); 94static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 95static void _notifier_call_chain(struct regulator_dev *rdev, 96 unsigned long event, void *data); 97static int _regulator_do_set_voltage(struct regulator_dev *rdev, 98 int min_uV, int max_uV); 99static struct regulator *create_regulator(struct regulator_dev *rdev, 100 struct device *dev, 101 const char *supply_name); 102 103static const char *rdev_get_name(struct regulator_dev *rdev) 104{ 105 if (rdev->constraints && rdev->constraints->name) 106 return rdev->constraints->name; 107 else if (rdev->desc->name) 108 return rdev->desc->name; 109 else 110 return ""; 111} 112 113/** 114 * of_get_regulator - get a regulator device node based on supply name 115 * @dev: Device pointer for the consumer (of regulator) device 116 * @supply: regulator supply name 117 * 118 * Extract the regulator device node corresponding to the supply name. 119 * retruns the device node corresponding to the regulator if found, else 120 * returns NULL. 121 */ 122static struct device_node *of_get_regulator(struct device *dev, const char *supply) 123{ 124 struct device_node *regnode = NULL; 125 char prop_name[32]; /* 32 is max size of property name */ 126 127 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 128 129 snprintf(prop_name, 32, "%s-supply", supply); 130 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 131 132 if (!regnode) { 133 dev_dbg(dev, "Looking up %s property in node %s failed", 134 prop_name, dev->of_node->full_name); 135 return NULL; 136 } 137 return regnode; 138} 139 140static int _regulator_can_change_status(struct regulator_dev *rdev) 141{ 142 if (!rdev->constraints) 143 return 0; 144 145 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 146 return 1; 147 else 148 return 0; 149} 150 151/* Platform voltage constraint check */ 152static int regulator_check_voltage(struct regulator_dev *rdev, 153 int *min_uV, int *max_uV) 154{ 155 BUG_ON(*min_uV > *max_uV); 156 157 if (!rdev->constraints) { 158 rdev_err(rdev, "no constraints\n"); 159 return -ENODEV; 160 } 161 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 162 rdev_err(rdev, "operation not allowed\n"); 163 return -EPERM; 164 } 165 166 if (*max_uV > rdev->constraints->max_uV) 167 *max_uV = rdev->constraints->max_uV; 168 if (*min_uV < rdev->constraints->min_uV) 169 *min_uV = rdev->constraints->min_uV; 170 171 if (*min_uV > *max_uV) { 172 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 173 *min_uV, *max_uV); 174 return -EINVAL; 175 } 176 177 return 0; 178} 179 180/* Make sure we select a voltage that suits the needs of all 181 * regulator consumers 182 */ 183static int regulator_check_consumers(struct regulator_dev *rdev, 184 int *min_uV, int *max_uV) 185{ 186 struct regulator *regulator; 187 188 list_for_each_entry(regulator, &rdev->consumer_list, list) { 189 /* 190 * Assume consumers that didn't say anything are OK 191 * with anything in the constraint range. 192 */ 193 if (!regulator->min_uV && !regulator->max_uV) 194 continue; 195 196 if (*max_uV > regulator->max_uV) 197 *max_uV = regulator->max_uV; 198 if (*min_uV < regulator->min_uV) 199 *min_uV = regulator->min_uV; 200 } 201 202 if (*min_uV > *max_uV) 203 return -EINVAL; 204 205 return 0; 206} 207 208/* current constraint check */ 209static int regulator_check_current_limit(struct regulator_dev *rdev, 210 int *min_uA, int *max_uA) 211{ 212 BUG_ON(*min_uA > *max_uA); 213 214 if (!rdev->constraints) { 215 rdev_err(rdev, "no constraints\n"); 216 return -ENODEV; 217 } 218 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 219 rdev_err(rdev, "operation not allowed\n"); 220 return -EPERM; 221 } 222 223 if (*max_uA > rdev->constraints->max_uA) 224 *max_uA = rdev->constraints->max_uA; 225 if (*min_uA < rdev->constraints->min_uA) 226 *min_uA = rdev->constraints->min_uA; 227 228 if (*min_uA > *max_uA) { 229 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 230 *min_uA, *max_uA); 231 return -EINVAL; 232 } 233 234 return 0; 235} 236 237/* operating mode constraint check */ 238static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 239{ 240 switch (*mode) { 241 case REGULATOR_MODE_FAST: 242 case REGULATOR_MODE_NORMAL: 243 case REGULATOR_MODE_IDLE: 244 case REGULATOR_MODE_STANDBY: 245 break; 246 default: 247 rdev_err(rdev, "invalid mode %x specified\n", *mode); 248 return -EINVAL; 249 } 250 251 if (!rdev->constraints) { 252 rdev_err(rdev, "no constraints\n"); 253 return -ENODEV; 254 } 255 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 256 rdev_err(rdev, "operation not allowed\n"); 257 return -EPERM; 258 } 259 260 /* The modes are bitmasks, the most power hungry modes having 261 * the lowest values. If the requested mode isn't supported 262 * try higher modes. */ 263 while (*mode) { 264 if (rdev->constraints->valid_modes_mask & *mode) 265 return 0; 266 *mode /= 2; 267 } 268 269 return -EINVAL; 270} 271 272/* dynamic regulator mode switching constraint check */ 273static int regulator_check_drms(struct regulator_dev *rdev) 274{ 275 if (!rdev->constraints) { 276 rdev_err(rdev, "no constraints\n"); 277 return -ENODEV; 278 } 279 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 280 rdev_err(rdev, "operation not allowed\n"); 281 return -EPERM; 282 } 283 return 0; 284} 285 286static ssize_t regulator_uV_show(struct device *dev, 287 struct device_attribute *attr, char *buf) 288{ 289 struct regulator_dev *rdev = dev_get_drvdata(dev); 290 ssize_t ret; 291 292 mutex_lock(&rdev->mutex); 293 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 294 mutex_unlock(&rdev->mutex); 295 296 return ret; 297} 298static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 299 300static ssize_t regulator_uA_show(struct device *dev, 301 struct device_attribute *attr, char *buf) 302{ 303 struct regulator_dev *rdev = dev_get_drvdata(dev); 304 305 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 306} 307static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 308 309static ssize_t regulator_name_show(struct device *dev, 310 struct device_attribute *attr, char *buf) 311{ 312 struct regulator_dev *rdev = dev_get_drvdata(dev); 313 314 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 315} 316 317static ssize_t regulator_print_opmode(char *buf, int mode) 318{ 319 switch (mode) { 320 case REGULATOR_MODE_FAST: 321 return sprintf(buf, "fast\n"); 322 case REGULATOR_MODE_NORMAL: 323 return sprintf(buf, "normal\n"); 324 case REGULATOR_MODE_IDLE: 325 return sprintf(buf, "idle\n"); 326 case REGULATOR_MODE_STANDBY: 327 return sprintf(buf, "standby\n"); 328 } 329 return sprintf(buf, "unknown\n"); 330} 331 332static ssize_t regulator_opmode_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 337 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 338} 339static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 340 341static ssize_t regulator_print_state(char *buf, int state) 342{ 343 if (state > 0) 344 return sprintf(buf, "enabled\n"); 345 else if (state == 0) 346 return sprintf(buf, "disabled\n"); 347 else 348 return sprintf(buf, "unknown\n"); 349} 350 351static ssize_t regulator_state_show(struct device *dev, 352 struct device_attribute *attr, char *buf) 353{ 354 struct regulator_dev *rdev = dev_get_drvdata(dev); 355 ssize_t ret; 356 357 mutex_lock(&rdev->mutex); 358 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 359 mutex_unlock(&rdev->mutex); 360 361 return ret; 362} 363static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 364 365static ssize_t regulator_status_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367{ 368 struct regulator_dev *rdev = dev_get_drvdata(dev); 369 int status; 370 char *label; 371 372 status = rdev->desc->ops->get_status(rdev); 373 if (status < 0) 374 return status; 375 376 switch (status) { 377 case REGULATOR_STATUS_OFF: 378 label = "off"; 379 break; 380 case REGULATOR_STATUS_ON: 381 label = "on"; 382 break; 383 case REGULATOR_STATUS_ERROR: 384 label = "error"; 385 break; 386 case REGULATOR_STATUS_FAST: 387 label = "fast"; 388 break; 389 case REGULATOR_STATUS_NORMAL: 390 label = "normal"; 391 break; 392 case REGULATOR_STATUS_IDLE: 393 label = "idle"; 394 break; 395 case REGULATOR_STATUS_STANDBY: 396 label = "standby"; 397 break; 398 case REGULATOR_STATUS_BYPASS: 399 label = "bypass"; 400 break; 401 case REGULATOR_STATUS_UNDEFINED: 402 label = "undefined"; 403 break; 404 default: 405 return -ERANGE; 406 } 407 408 return sprintf(buf, "%s\n", label); 409} 410static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 411 412static ssize_t regulator_min_uA_show(struct device *dev, 413 struct device_attribute *attr, char *buf) 414{ 415 struct regulator_dev *rdev = dev_get_drvdata(dev); 416 417 if (!rdev->constraints) 418 return sprintf(buf, "constraint not defined\n"); 419 420 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 421} 422static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 423 424static ssize_t regulator_max_uA_show(struct device *dev, 425 struct device_attribute *attr, char *buf) 426{ 427 struct regulator_dev *rdev = dev_get_drvdata(dev); 428 429 if (!rdev->constraints) 430 return sprintf(buf, "constraint not defined\n"); 431 432 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 433} 434static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 435 436static ssize_t regulator_min_uV_show(struct device *dev, 437 struct device_attribute *attr, char *buf) 438{ 439 struct regulator_dev *rdev = dev_get_drvdata(dev); 440 441 if (!rdev->constraints) 442 return sprintf(buf, "constraint not defined\n"); 443 444 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 445} 446static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 447 448static ssize_t regulator_max_uV_show(struct device *dev, 449 struct device_attribute *attr, char *buf) 450{ 451 struct regulator_dev *rdev = dev_get_drvdata(dev); 452 453 if (!rdev->constraints) 454 return sprintf(buf, "constraint not defined\n"); 455 456 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 457} 458static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 459 460static ssize_t regulator_total_uA_show(struct device *dev, 461 struct device_attribute *attr, char *buf) 462{ 463 struct regulator_dev *rdev = dev_get_drvdata(dev); 464 struct regulator *regulator; 465 int uA = 0; 466 467 mutex_lock(&rdev->mutex); 468 list_for_each_entry(regulator, &rdev->consumer_list, list) 469 uA += regulator->uA_load; 470 mutex_unlock(&rdev->mutex); 471 return sprintf(buf, "%d\n", uA); 472} 473static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 474 475static ssize_t regulator_num_users_show(struct device *dev, 476 struct device_attribute *attr, char *buf) 477{ 478 struct regulator_dev *rdev = dev_get_drvdata(dev); 479 return sprintf(buf, "%d\n", rdev->use_count); 480} 481 482static ssize_t regulator_type_show(struct device *dev, 483 struct device_attribute *attr, char *buf) 484{ 485 struct regulator_dev *rdev = dev_get_drvdata(dev); 486 487 switch (rdev->desc->type) { 488 case REGULATOR_VOLTAGE: 489 return sprintf(buf, "voltage\n"); 490 case REGULATOR_CURRENT: 491 return sprintf(buf, "current\n"); 492 } 493 return sprintf(buf, "unknown\n"); 494} 495 496static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 497 struct device_attribute *attr, char *buf) 498{ 499 struct regulator_dev *rdev = dev_get_drvdata(dev); 500 501 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 502} 503static DEVICE_ATTR(suspend_mem_microvolts, 0444, 504 regulator_suspend_mem_uV_show, NULL); 505 506static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 507 struct device_attribute *attr, char *buf) 508{ 509 struct regulator_dev *rdev = dev_get_drvdata(dev); 510 511 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 512} 513static DEVICE_ATTR(suspend_disk_microvolts, 0444, 514 regulator_suspend_disk_uV_show, NULL); 515 516static ssize_t regulator_suspend_standby_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_standby.uV); 522} 523static DEVICE_ATTR(suspend_standby_microvolts, 0444, 524 regulator_suspend_standby_uV_show, NULL); 525 526static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return regulator_print_opmode(buf, 532 rdev->constraints->state_mem.mode); 533} 534static DEVICE_ATTR(suspend_mem_mode, 0444, 535 regulator_suspend_mem_mode_show, NULL); 536 537static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 538 struct device_attribute *attr, char *buf) 539{ 540 struct regulator_dev *rdev = dev_get_drvdata(dev); 541 542 return regulator_print_opmode(buf, 543 rdev->constraints->state_disk.mode); 544} 545static DEVICE_ATTR(suspend_disk_mode, 0444, 546 regulator_suspend_disk_mode_show, NULL); 547 548static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 549 struct device_attribute *attr, char *buf) 550{ 551 struct regulator_dev *rdev = dev_get_drvdata(dev); 552 553 return regulator_print_opmode(buf, 554 rdev->constraints->state_standby.mode); 555} 556static DEVICE_ATTR(suspend_standby_mode, 0444, 557 regulator_suspend_standby_mode_show, NULL); 558 559static ssize_t regulator_suspend_mem_state_show(struct device *dev, 560 struct device_attribute *attr, char *buf) 561{ 562 struct regulator_dev *rdev = dev_get_drvdata(dev); 563 564 return regulator_print_state(buf, 565 rdev->constraints->state_mem.enabled); 566} 567static DEVICE_ATTR(suspend_mem_state, 0444, 568 regulator_suspend_mem_state_show, NULL); 569 570static ssize_t regulator_suspend_disk_state_show(struct device *dev, 571 struct device_attribute *attr, char *buf) 572{ 573 struct regulator_dev *rdev = dev_get_drvdata(dev); 574 575 return regulator_print_state(buf, 576 rdev->constraints->state_disk.enabled); 577} 578static DEVICE_ATTR(suspend_disk_state, 0444, 579 regulator_suspend_disk_state_show, NULL); 580 581static ssize_t regulator_suspend_standby_state_show(struct device *dev, 582 struct device_attribute *attr, char *buf) 583{ 584 struct regulator_dev *rdev = dev_get_drvdata(dev); 585 586 return regulator_print_state(buf, 587 rdev->constraints->state_standby.enabled); 588} 589static DEVICE_ATTR(suspend_standby_state, 0444, 590 regulator_suspend_standby_state_show, NULL); 591 592static ssize_t regulator_bypass_show(struct device *dev, 593 struct device_attribute *attr, char *buf) 594{ 595 struct regulator_dev *rdev = dev_get_drvdata(dev); 596 const char *report; 597 bool bypass; 598 int ret; 599 600 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 601 602 if (ret != 0) 603 report = "unknown"; 604 else if (bypass) 605 report = "enabled"; 606 else 607 report = "disabled"; 608 609 return sprintf(buf, "%s\n", report); 610} 611static DEVICE_ATTR(bypass, 0444, 612 regulator_bypass_show, NULL); 613 614/* 615 * These are the only attributes are present for all regulators. 616 * Other attributes are a function of regulator functionality. 617 */ 618static struct device_attribute regulator_dev_attrs[] = { 619 __ATTR(name, 0444, regulator_name_show, NULL), 620 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 621 __ATTR(type, 0444, regulator_type_show, NULL), 622 __ATTR_NULL, 623}; 624 625static void regulator_dev_release(struct device *dev) 626{ 627 struct regulator_dev *rdev = dev_get_drvdata(dev); 628 kfree(rdev); 629} 630 631static struct class regulator_class = { 632 .name = "regulator", 633 .dev_release = regulator_dev_release, 634 .dev_attrs = regulator_dev_attrs, 635}; 636 637/* Calculate the new optimum regulator operating mode based on the new total 638 * consumer load. All locks held by caller */ 639static void drms_uA_update(struct regulator_dev *rdev) 640{ 641 struct regulator *sibling; 642 int current_uA = 0, output_uV, input_uV, err; 643 unsigned int mode; 644 645 err = regulator_check_drms(rdev); 646 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 647 (!rdev->desc->ops->get_voltage && 648 !rdev->desc->ops->get_voltage_sel) || 649 !rdev->desc->ops->set_mode) 650 return; 651 652 /* get output voltage */ 653 output_uV = _regulator_get_voltage(rdev); 654 if (output_uV <= 0) 655 return; 656 657 /* get input voltage */ 658 input_uV = 0; 659 if (rdev->supply) 660 input_uV = regulator_get_voltage(rdev->supply); 661 if (input_uV <= 0) 662 input_uV = rdev->constraints->input_uV; 663 if (input_uV <= 0) 664 return; 665 666 /* calc total requested load */ 667 list_for_each_entry(sibling, &rdev->consumer_list, list) 668 current_uA += sibling->uA_load; 669 670 /* now get the optimum mode for our new total regulator load */ 671 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 672 output_uV, current_uA); 673 674 /* check the new mode is allowed */ 675 err = regulator_mode_constrain(rdev, &mode); 676 if (err == 0) 677 rdev->desc->ops->set_mode(rdev, mode); 678} 679 680static int suspend_set_state(struct regulator_dev *rdev, 681 struct regulator_state *rstate) 682{ 683 int ret = 0; 684 685 /* If we have no suspend mode configration don't set anything; 686 * only warn if the driver implements set_suspend_voltage or 687 * set_suspend_mode callback. 688 */ 689 if (!rstate->enabled && !rstate->disabled) { 690 if (rdev->desc->ops->set_suspend_voltage || 691 rdev->desc->ops->set_suspend_mode) 692 rdev_warn(rdev, "No configuration\n"); 693 return 0; 694 } 695 696 if (rstate->enabled && rstate->disabled) { 697 rdev_err(rdev, "invalid configuration\n"); 698 return -EINVAL; 699 } 700 701 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 702 ret = rdev->desc->ops->set_suspend_enable(rdev); 703 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 704 ret = rdev->desc->ops->set_suspend_disable(rdev); 705 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 706 ret = 0; 707 708 if (ret < 0) { 709 rdev_err(rdev, "failed to enabled/disable\n"); 710 return ret; 711 } 712 713 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 714 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 715 if (ret < 0) { 716 rdev_err(rdev, "failed to set voltage\n"); 717 return ret; 718 } 719 } 720 721 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 722 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 723 if (ret < 0) { 724 rdev_err(rdev, "failed to set mode\n"); 725 return ret; 726 } 727 } 728 return ret; 729} 730 731/* locks held by caller */ 732static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 733{ 734 if (!rdev->constraints) 735 return -EINVAL; 736 737 switch (state) { 738 case PM_SUSPEND_STANDBY: 739 return suspend_set_state(rdev, 740 &rdev->constraints->state_standby); 741 case PM_SUSPEND_MEM: 742 return suspend_set_state(rdev, 743 &rdev->constraints->state_mem); 744 case PM_SUSPEND_MAX: 745 return suspend_set_state(rdev, 746 &rdev->constraints->state_disk); 747 default: 748 return -EINVAL; 749 } 750} 751 752static void print_constraints(struct regulator_dev *rdev) 753{ 754 struct regulation_constraints *constraints = rdev->constraints; 755 char buf[80] = ""; 756 int count = 0; 757 int ret; 758 759 if (constraints->min_uV && constraints->max_uV) { 760 if (constraints->min_uV == constraints->max_uV) 761 count += sprintf(buf + count, "%d mV ", 762 constraints->min_uV / 1000); 763 else 764 count += sprintf(buf + count, "%d <--> %d mV ", 765 constraints->min_uV / 1000, 766 constraints->max_uV / 1000); 767 } 768 769 if (!constraints->min_uV || 770 constraints->min_uV != constraints->max_uV) { 771 ret = _regulator_get_voltage(rdev); 772 if (ret > 0) 773 count += sprintf(buf + count, "at %d mV ", ret / 1000); 774 } 775 776 if (constraints->uV_offset) 777 count += sprintf(buf, "%dmV offset ", 778 constraints->uV_offset / 1000); 779 780 if (constraints->min_uA && constraints->max_uA) { 781 if (constraints->min_uA == constraints->max_uA) 782 count += sprintf(buf + count, "%d mA ", 783 constraints->min_uA / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mA ", 786 constraints->min_uA / 1000, 787 constraints->max_uA / 1000); 788 } 789 790 if (!constraints->min_uA || 791 constraints->min_uA != constraints->max_uA) { 792 ret = _regulator_get_current_limit(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mA ", ret / 1000); 795 } 796 797 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 798 count += sprintf(buf + count, "fast "); 799 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 800 count += sprintf(buf + count, "normal "); 801 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 802 count += sprintf(buf + count, "idle "); 803 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 804 count += sprintf(buf + count, "standby"); 805 806 rdev_info(rdev, "%s\n", buf); 807 808 if ((constraints->min_uV != constraints->max_uV) && 809 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 810 rdev_warn(rdev, 811 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 812} 813 814static int machine_constraints_voltage(struct regulator_dev *rdev, 815 struct regulation_constraints *constraints) 816{ 817 struct regulator_ops *ops = rdev->desc->ops; 818 int ret; 819 820 /* do we need to apply the constraint voltage */ 821 if (rdev->constraints->apply_uV && 822 rdev->constraints->min_uV == rdev->constraints->max_uV) { 823 ret = _regulator_do_set_voltage(rdev, 824 rdev->constraints->min_uV, 825 rdev->constraints->max_uV); 826 if (ret < 0) { 827 rdev_err(rdev, "failed to apply %duV constraint\n", 828 rdev->constraints->min_uV); 829 return ret; 830 } 831 } 832 833 /* constrain machine-level voltage specs to fit 834 * the actual range supported by this regulator. 835 */ 836 if (ops->list_voltage && rdev->desc->n_voltages) { 837 int count = rdev->desc->n_voltages; 838 int i; 839 int min_uV = INT_MAX; 840 int max_uV = INT_MIN; 841 int cmin = constraints->min_uV; 842 int cmax = constraints->max_uV; 843 844 /* it's safe to autoconfigure fixed-voltage supplies 845 and the constraints are used by list_voltage. */ 846 if (count == 1 && !cmin) { 847 cmin = 1; 848 cmax = INT_MAX; 849 constraints->min_uV = cmin; 850 constraints->max_uV = cmax; 851 } 852 853 /* voltage constraints are optional */ 854 if ((cmin == 0) && (cmax == 0)) 855 return 0; 856 857 /* else require explicit machine-level constraints */ 858 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 859 rdev_err(rdev, "invalid voltage constraints\n"); 860 return -EINVAL; 861 } 862 863 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 864 for (i = 0; i < count; i++) { 865 int value; 866 867 value = ops->list_voltage(rdev, i); 868 if (value <= 0) 869 continue; 870 871 /* maybe adjust [min_uV..max_uV] */ 872 if (value >= cmin && value < min_uV) 873 min_uV = value; 874 if (value <= cmax && value > max_uV) 875 max_uV = value; 876 } 877 878 /* final: [min_uV..max_uV] valid iff constraints valid */ 879 if (max_uV < min_uV) { 880 rdev_err(rdev, "unsupportable voltage constraints\n"); 881 return -EINVAL; 882 } 883 884 /* use regulator's subset of machine constraints */ 885 if (constraints->min_uV < min_uV) { 886 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 887 constraints->min_uV, min_uV); 888 constraints->min_uV = min_uV; 889 } 890 if (constraints->max_uV > max_uV) { 891 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 892 constraints->max_uV, max_uV); 893 constraints->max_uV = max_uV; 894 } 895 } 896 897 return 0; 898} 899 900/** 901 * set_machine_constraints - sets regulator constraints 902 * @rdev: regulator source 903 * @constraints: constraints to apply 904 * 905 * Allows platform initialisation code to define and constrain 906 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 907 * Constraints *must* be set by platform code in order for some 908 * regulator operations to proceed i.e. set_voltage, set_current_limit, 909 * set_mode. 910 */ 911static int set_machine_constraints(struct regulator_dev *rdev, 912 const struct regulation_constraints *constraints) 913{ 914 int ret = 0; 915 struct regulator_ops *ops = rdev->desc->ops; 916 917 if (constraints) 918 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 919 GFP_KERNEL); 920 else 921 rdev->constraints = kzalloc(sizeof(*constraints), 922 GFP_KERNEL); 923 if (!rdev->constraints) 924 return -ENOMEM; 925 926 ret = machine_constraints_voltage(rdev, rdev->constraints); 927 if (ret != 0) 928 goto out; 929 930 /* do we need to setup our suspend state */ 931 if (rdev->constraints->initial_state) { 932 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 933 if (ret < 0) { 934 rdev_err(rdev, "failed to set suspend state\n"); 935 goto out; 936 } 937 } 938 939 if (rdev->constraints->initial_mode) { 940 if (!ops->set_mode) { 941 rdev_err(rdev, "no set_mode operation\n"); 942 ret = -EINVAL; 943 goto out; 944 } 945 946 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 947 if (ret < 0) { 948 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 949 goto out; 950 } 951 } 952 953 /* If the constraints say the regulator should be on at this point 954 * and we have control then make sure it is enabled. 955 */ 956 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 957 ops->enable) { 958 ret = ops->enable(rdev); 959 if (ret < 0) { 960 rdev_err(rdev, "failed to enable\n"); 961 goto out; 962 } 963 } 964 965 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 966 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 967 if (ret < 0) { 968 rdev_err(rdev, "failed to set ramp_delay\n"); 969 goto out; 970 } 971 } 972 973 print_constraints(rdev); 974 return 0; 975out: 976 kfree(rdev->constraints); 977 rdev->constraints = NULL; 978 return ret; 979} 980 981/** 982 * set_supply - set regulator supply regulator 983 * @rdev: regulator name 984 * @supply_rdev: supply regulator name 985 * 986 * Called by platform initialisation code to set the supply regulator for this 987 * regulator. This ensures that a regulators supply will also be enabled by the 988 * core if it's child is enabled. 989 */ 990static int set_supply(struct regulator_dev *rdev, 991 struct regulator_dev *supply_rdev) 992{ 993 int err; 994 995 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 996 997 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 998 if (rdev->supply == NULL) { 999 err = -ENOMEM; 1000 return err; 1001 } 1002 1003 return 0; 1004} 1005 1006/** 1007 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1008 * @rdev: regulator source 1009 * @consumer_dev_name: dev_name() string for device supply applies to 1010 * @supply: symbolic name for supply 1011 * 1012 * Allows platform initialisation code to map physical regulator 1013 * sources to symbolic names for supplies for use by devices. Devices 1014 * should use these symbolic names to request regulators, avoiding the 1015 * need to provide board-specific regulator names as platform data. 1016 */ 1017static int set_consumer_device_supply(struct regulator_dev *rdev, 1018 const char *consumer_dev_name, 1019 const char *supply) 1020{ 1021 struct regulator_map *node; 1022 int has_dev; 1023 1024 if (supply == NULL) 1025 return -EINVAL; 1026 1027 if (consumer_dev_name != NULL) 1028 has_dev = 1; 1029 else 1030 has_dev = 0; 1031 1032 list_for_each_entry(node, ®ulator_map_list, list) { 1033 if (node->dev_name && consumer_dev_name) { 1034 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1035 continue; 1036 } else if (node->dev_name || consumer_dev_name) { 1037 continue; 1038 } 1039 1040 if (strcmp(node->supply, supply) != 0) 1041 continue; 1042 1043 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1044 consumer_dev_name, 1045 dev_name(&node->regulator->dev), 1046 node->regulator->desc->name, 1047 supply, 1048 dev_name(&rdev->dev), rdev_get_name(rdev)); 1049 return -EBUSY; 1050 } 1051 1052 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1053 if (node == NULL) 1054 return -ENOMEM; 1055 1056 node->regulator = rdev; 1057 node->supply = supply; 1058 1059 if (has_dev) { 1060 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1061 if (node->dev_name == NULL) { 1062 kfree(node); 1063 return -ENOMEM; 1064 } 1065 } 1066 1067 list_add(&node->list, ®ulator_map_list); 1068 return 0; 1069} 1070 1071static void unset_regulator_supplies(struct regulator_dev *rdev) 1072{ 1073 struct regulator_map *node, *n; 1074 1075 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1076 if (rdev == node->regulator) { 1077 list_del(&node->list); 1078 kfree(node->dev_name); 1079 kfree(node); 1080 } 1081 } 1082} 1083 1084#define REG_STR_SIZE 64 1085 1086static struct regulator *create_regulator(struct regulator_dev *rdev, 1087 struct device *dev, 1088 const char *supply_name) 1089{ 1090 struct regulator *regulator; 1091 char buf[REG_STR_SIZE]; 1092 int err, size; 1093 1094 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1095 if (regulator == NULL) 1096 return NULL; 1097 1098 mutex_lock(&rdev->mutex); 1099 regulator->rdev = rdev; 1100 list_add(®ulator->list, &rdev->consumer_list); 1101 1102 if (dev) { 1103 regulator->dev = dev; 1104 1105 /* Add a link to the device sysfs entry */ 1106 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1107 dev->kobj.name, supply_name); 1108 if (size >= REG_STR_SIZE) 1109 goto overflow_err; 1110 1111 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1112 if (regulator->supply_name == NULL) 1113 goto overflow_err; 1114 1115 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1116 buf); 1117 if (err) { 1118 rdev_warn(rdev, "could not add device link %s err %d\n", 1119 dev->kobj.name, err); 1120 /* non-fatal */ 1121 } 1122 } else { 1123 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1124 if (regulator->supply_name == NULL) 1125 goto overflow_err; 1126 } 1127 1128 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1129 rdev->debugfs); 1130 if (!regulator->debugfs) { 1131 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1132 } else { 1133 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1134 ®ulator->uA_load); 1135 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1136 ®ulator->min_uV); 1137 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1138 ®ulator->max_uV); 1139 } 1140 1141 /* 1142 * Check now if the regulator is an always on regulator - if 1143 * it is then we don't need to do nearly so much work for 1144 * enable/disable calls. 1145 */ 1146 if (!_regulator_can_change_status(rdev) && 1147 _regulator_is_enabled(rdev)) 1148 regulator->always_on = true; 1149 1150 mutex_unlock(&rdev->mutex); 1151 return regulator; 1152overflow_err: 1153 list_del(®ulator->list); 1154 kfree(regulator); 1155 mutex_unlock(&rdev->mutex); 1156 return NULL; 1157} 1158 1159static int _regulator_get_enable_time(struct regulator_dev *rdev) 1160{ 1161 if (!rdev->desc->ops->enable_time) 1162 return rdev->desc->enable_time; 1163 return rdev->desc->ops->enable_time(rdev); 1164} 1165 1166static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1167 const char *supply, 1168 int *ret) 1169{ 1170 struct regulator_dev *r; 1171 struct device_node *node; 1172 struct regulator_map *map; 1173 const char *devname = NULL; 1174 1175 /* first do a dt based lookup */ 1176 if (dev && dev->of_node) { 1177 node = of_get_regulator(dev, supply); 1178 if (node) { 1179 list_for_each_entry(r, ®ulator_list, list) 1180 if (r->dev.parent && 1181 node == r->dev.of_node) 1182 return r; 1183 } else { 1184 /* 1185 * If we couldn't even get the node then it's 1186 * not just that the device didn't register 1187 * yet, there's no node and we'll never 1188 * succeed. 1189 */ 1190 *ret = -ENODEV; 1191 } 1192 } 1193 1194 /* if not found, try doing it non-dt way */ 1195 if (dev) 1196 devname = dev_name(dev); 1197 1198 list_for_each_entry(r, ®ulator_list, list) 1199 if (strcmp(rdev_get_name(r), supply) == 0) 1200 return r; 1201 1202 list_for_each_entry(map, ®ulator_map_list, list) { 1203 /* If the mapping has a device set up it must match */ 1204 if (map->dev_name && 1205 (!devname || strcmp(map->dev_name, devname))) 1206 continue; 1207 1208 if (strcmp(map->supply, supply) == 0) 1209 return map->regulator; 1210 } 1211 1212 1213 return NULL; 1214} 1215 1216/* Internal regulator request function */ 1217static struct regulator *_regulator_get(struct device *dev, const char *id, 1218 int exclusive) 1219{ 1220 struct regulator_dev *rdev; 1221 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1222 const char *devname = NULL; 1223 int ret; 1224 1225 if (id == NULL) { 1226 pr_err("get() with no identifier\n"); 1227 return regulator; 1228 } 1229 1230 if (dev) 1231 devname = dev_name(dev); 1232 1233 mutex_lock(®ulator_list_mutex); 1234 1235 rdev = regulator_dev_lookup(dev, id, &ret); 1236 if (rdev) 1237 goto found; 1238 1239 if (board_wants_dummy_regulator) { 1240 rdev = dummy_regulator_rdev; 1241 goto found; 1242 } 1243 1244#ifdef CONFIG_REGULATOR_DUMMY 1245 if (!devname) 1246 devname = "deviceless"; 1247 1248 /* If the board didn't flag that it was fully constrained then 1249 * substitute in a dummy regulator so consumers can continue. 1250 */ 1251 if (!has_full_constraints) { 1252 pr_warn("%s supply %s not found, using dummy regulator\n", 1253 devname, id); 1254 rdev = dummy_regulator_rdev; 1255 goto found; 1256 } 1257#endif 1258 1259 mutex_unlock(®ulator_list_mutex); 1260 return regulator; 1261 1262found: 1263 if (rdev->exclusive) { 1264 regulator = ERR_PTR(-EPERM); 1265 goto out; 1266 } 1267 1268 if (exclusive && rdev->open_count) { 1269 regulator = ERR_PTR(-EBUSY); 1270 goto out; 1271 } 1272 1273 if (!try_module_get(rdev->owner)) 1274 goto out; 1275 1276 regulator = create_regulator(rdev, dev, id); 1277 if (regulator == NULL) { 1278 regulator = ERR_PTR(-ENOMEM); 1279 module_put(rdev->owner); 1280 goto out; 1281 } 1282 1283 rdev->open_count++; 1284 if (exclusive) { 1285 rdev->exclusive = 1; 1286 1287 ret = _regulator_is_enabled(rdev); 1288 if (ret > 0) 1289 rdev->use_count = 1; 1290 else 1291 rdev->use_count = 0; 1292 } 1293 1294out: 1295 mutex_unlock(®ulator_list_mutex); 1296 1297 return regulator; 1298} 1299 1300/** 1301 * regulator_get - lookup and obtain a reference to a regulator. 1302 * @dev: device for regulator "consumer" 1303 * @id: Supply name or regulator ID. 1304 * 1305 * Returns a struct regulator corresponding to the regulator producer, 1306 * or IS_ERR() condition containing errno. 1307 * 1308 * Use of supply names configured via regulator_set_device_supply() is 1309 * strongly encouraged. It is recommended that the supply name used 1310 * should match the name used for the supply and/or the relevant 1311 * device pins in the datasheet. 1312 */ 1313struct regulator *regulator_get(struct device *dev, const char *id) 1314{ 1315 return _regulator_get(dev, id, 0); 1316} 1317EXPORT_SYMBOL_GPL(regulator_get); 1318 1319static void devm_regulator_release(struct device *dev, void *res) 1320{ 1321 regulator_put(*(struct regulator **)res); 1322} 1323 1324/** 1325 * devm_regulator_get - Resource managed regulator_get() 1326 * @dev: device for regulator "consumer" 1327 * @id: Supply name or regulator ID. 1328 * 1329 * Managed regulator_get(). Regulators returned from this function are 1330 * automatically regulator_put() on driver detach. See regulator_get() for more 1331 * information. 1332 */ 1333struct regulator *devm_regulator_get(struct device *dev, const char *id) 1334{ 1335 struct regulator **ptr, *regulator; 1336 1337 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1338 if (!ptr) 1339 return ERR_PTR(-ENOMEM); 1340 1341 regulator = regulator_get(dev, id); 1342 if (!IS_ERR(regulator)) { 1343 *ptr = regulator; 1344 devres_add(dev, ptr); 1345 } else { 1346 devres_free(ptr); 1347 } 1348 1349 return regulator; 1350} 1351EXPORT_SYMBOL_GPL(devm_regulator_get); 1352 1353/** 1354 * regulator_get_exclusive - obtain exclusive access to a regulator. 1355 * @dev: device for regulator "consumer" 1356 * @id: Supply name or regulator ID. 1357 * 1358 * Returns a struct regulator corresponding to the regulator producer, 1359 * or IS_ERR() condition containing errno. Other consumers will be 1360 * unable to obtain this reference is held and the use count for the 1361 * regulator will be initialised to reflect the current state of the 1362 * regulator. 1363 * 1364 * This is intended for use by consumers which cannot tolerate shared 1365 * use of the regulator such as those which need to force the 1366 * regulator off for correct operation of the hardware they are 1367 * controlling. 1368 * 1369 * Use of supply names configured via regulator_set_device_supply() is 1370 * strongly encouraged. It is recommended that the supply name used 1371 * should match the name used for the supply and/or the relevant 1372 * device pins in the datasheet. 1373 */ 1374struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1375{ 1376 return _regulator_get(dev, id, 1); 1377} 1378EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1379 1380/** 1381 * regulator_put - "free" the regulator source 1382 * @regulator: regulator source 1383 * 1384 * Note: drivers must ensure that all regulator_enable calls made on this 1385 * regulator source are balanced by regulator_disable calls prior to calling 1386 * this function. 1387 */ 1388void regulator_put(struct regulator *regulator) 1389{ 1390 struct regulator_dev *rdev; 1391 1392 if (regulator == NULL || IS_ERR(regulator)) 1393 return; 1394 1395 mutex_lock(®ulator_list_mutex); 1396 rdev = regulator->rdev; 1397 1398 debugfs_remove_recursive(regulator->debugfs); 1399 1400 /* remove any sysfs entries */ 1401 if (regulator->dev) 1402 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1403 kfree(regulator->supply_name); 1404 list_del(®ulator->list); 1405 kfree(regulator); 1406 1407 rdev->open_count--; 1408 rdev->exclusive = 0; 1409 1410 module_put(rdev->owner); 1411 mutex_unlock(®ulator_list_mutex); 1412} 1413EXPORT_SYMBOL_GPL(regulator_put); 1414 1415static int devm_regulator_match(struct device *dev, void *res, void *data) 1416{ 1417 struct regulator **r = res; 1418 if (!r || !*r) { 1419 WARN_ON(!r || !*r); 1420 return 0; 1421 } 1422 return *r == data; 1423} 1424 1425/** 1426 * devm_regulator_put - Resource managed regulator_put() 1427 * @regulator: regulator to free 1428 * 1429 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1430 * this function will not need to be called and the resource management 1431 * code will ensure that the resource is freed. 1432 */ 1433void devm_regulator_put(struct regulator *regulator) 1434{ 1435 int rc; 1436 1437 rc = devres_release(regulator->dev, devm_regulator_release, 1438 devm_regulator_match, regulator); 1439 if (rc != 0) 1440 WARN_ON(rc); 1441} 1442EXPORT_SYMBOL_GPL(devm_regulator_put); 1443 1444static int _regulator_do_enable(struct regulator_dev *rdev) 1445{ 1446 int ret, delay; 1447 1448 /* Query before enabling in case configuration dependent. */ 1449 ret = _regulator_get_enable_time(rdev); 1450 if (ret >= 0) { 1451 delay = ret; 1452 } else { 1453 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1454 delay = 0; 1455 } 1456 1457 trace_regulator_enable(rdev_get_name(rdev)); 1458 1459 if (rdev->ena_gpio) { 1460 gpio_set_value_cansleep(rdev->ena_gpio, 1461 !rdev->ena_gpio_invert); 1462 rdev->ena_gpio_state = 1; 1463 } else if (rdev->desc->ops->enable) { 1464 ret = rdev->desc->ops->enable(rdev); 1465 if (ret < 0) 1466 return ret; 1467 } else { 1468 return -EINVAL; 1469 } 1470 1471 /* Allow the regulator to ramp; it would be useful to extend 1472 * this for bulk operations so that the regulators can ramp 1473 * together. */ 1474 trace_regulator_enable_delay(rdev_get_name(rdev)); 1475 1476 if (delay >= 1000) { 1477 mdelay(delay / 1000); 1478 udelay(delay % 1000); 1479 } else if (delay) { 1480 udelay(delay); 1481 } 1482 1483 trace_regulator_enable_complete(rdev_get_name(rdev)); 1484 1485 return 0; 1486} 1487 1488/* locks held by regulator_enable() */ 1489static int _regulator_enable(struct regulator_dev *rdev) 1490{ 1491 int ret; 1492 1493 /* check voltage and requested load before enabling */ 1494 if (rdev->constraints && 1495 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1496 drms_uA_update(rdev); 1497 1498 if (rdev->use_count == 0) { 1499 /* The regulator may on if it's not switchable or left on */ 1500 ret = _regulator_is_enabled(rdev); 1501 if (ret == -EINVAL || ret == 0) { 1502 if (!_regulator_can_change_status(rdev)) 1503 return -EPERM; 1504 1505 ret = _regulator_do_enable(rdev); 1506 if (ret < 0) 1507 return ret; 1508 1509 } else if (ret < 0) { 1510 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1511 return ret; 1512 } 1513 /* Fallthrough on positive return values - already enabled */ 1514 } 1515 1516 rdev->use_count++; 1517 1518 return 0; 1519} 1520 1521/** 1522 * regulator_enable - enable regulator output 1523 * @regulator: regulator source 1524 * 1525 * Request that the regulator be enabled with the regulator output at 1526 * the predefined voltage or current value. Calls to regulator_enable() 1527 * must be balanced with calls to regulator_disable(). 1528 * 1529 * NOTE: the output value can be set by other drivers, boot loader or may be 1530 * hardwired in the regulator. 1531 */ 1532int regulator_enable(struct regulator *regulator) 1533{ 1534 struct regulator_dev *rdev = regulator->rdev; 1535 int ret = 0; 1536 1537 if (regulator->always_on) 1538 return 0; 1539 1540 if (rdev->supply) { 1541 ret = regulator_enable(rdev->supply); 1542 if (ret != 0) 1543 return ret; 1544 } 1545 1546 mutex_lock(&rdev->mutex); 1547 ret = _regulator_enable(rdev); 1548 mutex_unlock(&rdev->mutex); 1549 1550 if (ret != 0 && rdev->supply) 1551 regulator_disable(rdev->supply); 1552 1553 return ret; 1554} 1555EXPORT_SYMBOL_GPL(regulator_enable); 1556 1557static int _regulator_do_disable(struct regulator_dev *rdev) 1558{ 1559 int ret; 1560 1561 trace_regulator_disable(rdev_get_name(rdev)); 1562 1563 if (rdev->ena_gpio) { 1564 gpio_set_value_cansleep(rdev->ena_gpio, 1565 rdev->ena_gpio_invert); 1566 rdev->ena_gpio_state = 0; 1567 1568 } else if (rdev->desc->ops->disable) { 1569 ret = rdev->desc->ops->disable(rdev); 1570 if (ret != 0) 1571 return ret; 1572 } 1573 1574 trace_regulator_disable_complete(rdev_get_name(rdev)); 1575 1576 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1577 NULL); 1578 return 0; 1579} 1580 1581/* locks held by regulator_disable() */ 1582static int _regulator_disable(struct regulator_dev *rdev) 1583{ 1584 int ret = 0; 1585 1586 if (WARN(rdev->use_count <= 0, 1587 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1588 return -EIO; 1589 1590 /* are we the last user and permitted to disable ? */ 1591 if (rdev->use_count == 1 && 1592 (rdev->constraints && !rdev->constraints->always_on)) { 1593 1594 /* we are last user */ 1595 if (_regulator_can_change_status(rdev)) { 1596 ret = _regulator_do_disable(rdev); 1597 if (ret < 0) { 1598 rdev_err(rdev, "failed to disable\n"); 1599 return ret; 1600 } 1601 } 1602 1603 rdev->use_count = 0; 1604 } else if (rdev->use_count > 1) { 1605 1606 if (rdev->constraints && 1607 (rdev->constraints->valid_ops_mask & 1608 REGULATOR_CHANGE_DRMS)) 1609 drms_uA_update(rdev); 1610 1611 rdev->use_count--; 1612 } 1613 1614 return ret; 1615} 1616 1617/** 1618 * regulator_disable - disable regulator output 1619 * @regulator: regulator source 1620 * 1621 * Disable the regulator output voltage or current. Calls to 1622 * regulator_enable() must be balanced with calls to 1623 * regulator_disable(). 1624 * 1625 * NOTE: this will only disable the regulator output if no other consumer 1626 * devices have it enabled, the regulator device supports disabling and 1627 * machine constraints permit this operation. 1628 */ 1629int regulator_disable(struct regulator *regulator) 1630{ 1631 struct regulator_dev *rdev = regulator->rdev; 1632 int ret = 0; 1633 1634 if (regulator->always_on) 1635 return 0; 1636 1637 mutex_lock(&rdev->mutex); 1638 ret = _regulator_disable(rdev); 1639 mutex_unlock(&rdev->mutex); 1640 1641 if (ret == 0 && rdev->supply) 1642 regulator_disable(rdev->supply); 1643 1644 return ret; 1645} 1646EXPORT_SYMBOL_GPL(regulator_disable); 1647 1648/* locks held by regulator_force_disable() */ 1649static int _regulator_force_disable(struct regulator_dev *rdev) 1650{ 1651 int ret = 0; 1652 1653 /* force disable */ 1654 if (rdev->desc->ops->disable) { 1655 /* ah well, who wants to live forever... */ 1656 ret = rdev->desc->ops->disable(rdev); 1657 if (ret < 0) { 1658 rdev_err(rdev, "failed to force disable\n"); 1659 return ret; 1660 } 1661 /* notify other consumers that power has been forced off */ 1662 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1663 REGULATOR_EVENT_DISABLE, NULL); 1664 } 1665 1666 return ret; 1667} 1668 1669/** 1670 * regulator_force_disable - force disable regulator output 1671 * @regulator: regulator source 1672 * 1673 * Forcibly disable the regulator output voltage or current. 1674 * NOTE: this *will* disable the regulator output even if other consumer 1675 * devices have it enabled. This should be used for situations when device 1676 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1677 */ 1678int regulator_force_disable(struct regulator *regulator) 1679{ 1680 struct regulator_dev *rdev = regulator->rdev; 1681 int ret; 1682 1683 mutex_lock(&rdev->mutex); 1684 regulator->uA_load = 0; 1685 ret = _regulator_force_disable(regulator->rdev); 1686 mutex_unlock(&rdev->mutex); 1687 1688 if (rdev->supply) 1689 while (rdev->open_count--) 1690 regulator_disable(rdev->supply); 1691 1692 return ret; 1693} 1694EXPORT_SYMBOL_GPL(regulator_force_disable); 1695 1696static void regulator_disable_work(struct work_struct *work) 1697{ 1698 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1699 disable_work.work); 1700 int count, i, ret; 1701 1702 mutex_lock(&rdev->mutex); 1703 1704 BUG_ON(!rdev->deferred_disables); 1705 1706 count = rdev->deferred_disables; 1707 rdev->deferred_disables = 0; 1708 1709 for (i = 0; i < count; i++) { 1710 ret = _regulator_disable(rdev); 1711 if (ret != 0) 1712 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1713 } 1714 1715 mutex_unlock(&rdev->mutex); 1716 1717 if (rdev->supply) { 1718 for (i = 0; i < count; i++) { 1719 ret = regulator_disable(rdev->supply); 1720 if (ret != 0) { 1721 rdev_err(rdev, 1722 "Supply disable failed: %d\n", ret); 1723 } 1724 } 1725 } 1726} 1727 1728/** 1729 * regulator_disable_deferred - disable regulator output with delay 1730 * @regulator: regulator source 1731 * @ms: miliseconds until the regulator is disabled 1732 * 1733 * Execute regulator_disable() on the regulator after a delay. This 1734 * is intended for use with devices that require some time to quiesce. 1735 * 1736 * NOTE: this will only disable the regulator output if no other consumer 1737 * devices have it enabled, the regulator device supports disabling and 1738 * machine constraints permit this operation. 1739 */ 1740int regulator_disable_deferred(struct regulator *regulator, int ms) 1741{ 1742 struct regulator_dev *rdev = regulator->rdev; 1743 int ret; 1744 1745 if (regulator->always_on) 1746 return 0; 1747 1748 mutex_lock(&rdev->mutex); 1749 rdev->deferred_disables++; 1750 mutex_unlock(&rdev->mutex); 1751 1752 ret = schedule_delayed_work(&rdev->disable_work, 1753 msecs_to_jiffies(ms)); 1754 if (ret < 0) 1755 return ret; 1756 else 1757 return 0; 1758} 1759EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1760 1761/** 1762 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1763 * 1764 * @rdev: regulator to operate on 1765 * 1766 * Regulators that use regmap for their register I/O can set the 1767 * enable_reg and enable_mask fields in their descriptor and then use 1768 * this as their is_enabled operation, saving some code. 1769 */ 1770int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1771{ 1772 unsigned int val; 1773 int ret; 1774 1775 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1776 if (ret != 0) 1777 return ret; 1778 1779 return (val & rdev->desc->enable_mask) != 0; 1780} 1781EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1782 1783/** 1784 * regulator_enable_regmap - standard enable() for regmap users 1785 * 1786 * @rdev: regulator to operate on 1787 * 1788 * Regulators that use regmap for their register I/O can set the 1789 * enable_reg and enable_mask fields in their descriptor and then use 1790 * this as their enable() operation, saving some code. 1791 */ 1792int regulator_enable_regmap(struct regulator_dev *rdev) 1793{ 1794 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1795 rdev->desc->enable_mask, 1796 rdev->desc->enable_mask); 1797} 1798EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1799 1800/** 1801 * regulator_disable_regmap - standard disable() for regmap users 1802 * 1803 * @rdev: regulator to operate on 1804 * 1805 * Regulators that use regmap for their register I/O can set the 1806 * enable_reg and enable_mask fields in their descriptor and then use 1807 * this as their disable() operation, saving some code. 1808 */ 1809int regulator_disable_regmap(struct regulator_dev *rdev) 1810{ 1811 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1812 rdev->desc->enable_mask, 0); 1813} 1814EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1815 1816static int _regulator_is_enabled(struct regulator_dev *rdev) 1817{ 1818 /* A GPIO control always takes precedence */ 1819 if (rdev->ena_gpio) 1820 return rdev->ena_gpio_state; 1821 1822 /* If we don't know then assume that the regulator is always on */ 1823 if (!rdev->desc->ops->is_enabled) 1824 return 1; 1825 1826 return rdev->desc->ops->is_enabled(rdev); 1827} 1828 1829/** 1830 * regulator_is_enabled - is the regulator output enabled 1831 * @regulator: regulator source 1832 * 1833 * Returns positive if the regulator driver backing the source/client 1834 * has requested that the device be enabled, zero if it hasn't, else a 1835 * negative errno code. 1836 * 1837 * Note that the device backing this regulator handle can have multiple 1838 * users, so it might be enabled even if regulator_enable() was never 1839 * called for this particular source. 1840 */ 1841int regulator_is_enabled(struct regulator *regulator) 1842{ 1843 int ret; 1844 1845 if (regulator->always_on) 1846 return 1; 1847 1848 mutex_lock(®ulator->rdev->mutex); 1849 ret = _regulator_is_enabled(regulator->rdev); 1850 mutex_unlock(®ulator->rdev->mutex); 1851 1852 return ret; 1853} 1854EXPORT_SYMBOL_GPL(regulator_is_enabled); 1855 1856/** 1857 * regulator_count_voltages - count regulator_list_voltage() selectors 1858 * @regulator: regulator source 1859 * 1860 * Returns number of selectors, or negative errno. Selectors are 1861 * numbered starting at zero, and typically correspond to bitfields 1862 * in hardware registers. 1863 */ 1864int regulator_count_voltages(struct regulator *regulator) 1865{ 1866 struct regulator_dev *rdev = regulator->rdev; 1867 1868 return rdev->desc->n_voltages ? : -EINVAL; 1869} 1870EXPORT_SYMBOL_GPL(regulator_count_voltages); 1871 1872/** 1873 * regulator_list_voltage_linear - List voltages with simple calculation 1874 * 1875 * @rdev: Regulator device 1876 * @selector: Selector to convert into a voltage 1877 * 1878 * Regulators with a simple linear mapping between voltages and 1879 * selectors can set min_uV and uV_step in the regulator descriptor 1880 * and then use this function as their list_voltage() operation, 1881 */ 1882int regulator_list_voltage_linear(struct regulator_dev *rdev, 1883 unsigned int selector) 1884{ 1885 if (selector >= rdev->desc->n_voltages) 1886 return -EINVAL; 1887 1888 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1889} 1890EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1891 1892/** 1893 * regulator_list_voltage_table - List voltages with table based mapping 1894 * 1895 * @rdev: Regulator device 1896 * @selector: Selector to convert into a voltage 1897 * 1898 * Regulators with table based mapping between voltages and 1899 * selectors can set volt_table in the regulator descriptor 1900 * and then use this function as their list_voltage() operation. 1901 */ 1902int regulator_list_voltage_table(struct regulator_dev *rdev, 1903 unsigned int selector) 1904{ 1905 if (!rdev->desc->volt_table) { 1906 BUG_ON(!rdev->desc->volt_table); 1907 return -EINVAL; 1908 } 1909 1910 if (selector >= rdev->desc->n_voltages) 1911 return -EINVAL; 1912 1913 return rdev->desc->volt_table[selector]; 1914} 1915EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1916 1917/** 1918 * regulator_list_voltage - enumerate supported voltages 1919 * @regulator: regulator source 1920 * @selector: identify voltage to list 1921 * Context: can sleep 1922 * 1923 * Returns a voltage that can be passed to @regulator_set_voltage(), 1924 * zero if this selector code can't be used on this system, or a 1925 * negative errno. 1926 */ 1927int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1928{ 1929 struct regulator_dev *rdev = regulator->rdev; 1930 struct regulator_ops *ops = rdev->desc->ops; 1931 int ret; 1932 1933 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1934 return -EINVAL; 1935 1936 mutex_lock(&rdev->mutex); 1937 ret = ops->list_voltage(rdev, selector); 1938 mutex_unlock(&rdev->mutex); 1939 1940 if (ret > 0) { 1941 if (ret < rdev->constraints->min_uV) 1942 ret = 0; 1943 else if (ret > rdev->constraints->max_uV) 1944 ret = 0; 1945 } 1946 1947 return ret; 1948} 1949EXPORT_SYMBOL_GPL(regulator_list_voltage); 1950 1951/** 1952 * regulator_is_supported_voltage - check if a voltage range can be supported 1953 * 1954 * @regulator: Regulator to check. 1955 * @min_uV: Minimum required voltage in uV. 1956 * @max_uV: Maximum required voltage in uV. 1957 * 1958 * Returns a boolean or a negative error code. 1959 */ 1960int regulator_is_supported_voltage(struct regulator *regulator, 1961 int min_uV, int max_uV) 1962{ 1963 struct regulator_dev *rdev = regulator->rdev; 1964 int i, voltages, ret; 1965 1966 /* If we can't change voltage check the current voltage */ 1967 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1968 ret = regulator_get_voltage(regulator); 1969 if (ret >= 0) 1970 return (min_uV >= ret && ret <= max_uV); 1971 else 1972 return ret; 1973 } 1974 1975 ret = regulator_count_voltages(regulator); 1976 if (ret < 0) 1977 return ret; 1978 voltages = ret; 1979 1980 for (i = 0; i < voltages; i++) { 1981 ret = regulator_list_voltage(regulator, i); 1982 1983 if (ret >= min_uV && ret <= max_uV) 1984 return 1; 1985 } 1986 1987 return 0; 1988} 1989EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1990 1991/** 1992 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1993 * 1994 * @rdev: regulator to operate on 1995 * 1996 * Regulators that use regmap for their register I/O can set the 1997 * vsel_reg and vsel_mask fields in their descriptor and then use this 1998 * as their get_voltage_vsel operation, saving some code. 1999 */ 2000int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2001{ 2002 unsigned int val; 2003 int ret; 2004 2005 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2006 if (ret != 0) 2007 return ret; 2008 2009 val &= rdev->desc->vsel_mask; 2010 val >>= ffs(rdev->desc->vsel_mask) - 1; 2011 2012 return val; 2013} 2014EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2015 2016/** 2017 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2018 * 2019 * @rdev: regulator to operate on 2020 * @sel: Selector to set 2021 * 2022 * Regulators that use regmap for their register I/O can set the 2023 * vsel_reg and vsel_mask fields in their descriptor and then use this 2024 * as their set_voltage_vsel operation, saving some code. 2025 */ 2026int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2027{ 2028 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2029 2030 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2031 rdev->desc->vsel_mask, sel); 2032} 2033EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2034 2035/** 2036 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2037 * 2038 * @rdev: Regulator to operate on 2039 * @min_uV: Lower bound for voltage 2040 * @max_uV: Upper bound for voltage 2041 * 2042 * Drivers implementing set_voltage_sel() and list_voltage() can use 2043 * this as their map_voltage() operation. It will find a suitable 2044 * voltage by calling list_voltage() until it gets something in bounds 2045 * for the requested voltages. 2046 */ 2047int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2048 int min_uV, int max_uV) 2049{ 2050 int best_val = INT_MAX; 2051 int selector = 0; 2052 int i, ret; 2053 2054 /* Find the smallest voltage that falls within the specified 2055 * range. 2056 */ 2057 for (i = 0; i < rdev->desc->n_voltages; i++) { 2058 ret = rdev->desc->ops->list_voltage(rdev, i); 2059 if (ret < 0) 2060 continue; 2061 2062 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2063 best_val = ret; 2064 selector = i; 2065 } 2066 } 2067 2068 if (best_val != INT_MAX) 2069 return selector; 2070 else 2071 return -EINVAL; 2072} 2073EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2074 2075/** 2076 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2077 * 2078 * @rdev: Regulator to operate on 2079 * @min_uV: Lower bound for voltage 2080 * @max_uV: Upper bound for voltage 2081 * 2082 * Drivers providing min_uV and uV_step in their regulator_desc can 2083 * use this as their map_voltage() operation. 2084 */ 2085int regulator_map_voltage_linear(struct regulator_dev *rdev, 2086 int min_uV, int max_uV) 2087{ 2088 int ret, voltage; 2089 2090 /* Allow uV_step to be 0 for fixed voltage */ 2091 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2092 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2093 return 0; 2094 else 2095 return -EINVAL; 2096 } 2097 2098 if (!rdev->desc->uV_step) { 2099 BUG_ON(!rdev->desc->uV_step); 2100 return -EINVAL; 2101 } 2102 2103 if (min_uV < rdev->desc->min_uV) 2104 min_uV = rdev->desc->min_uV; 2105 2106 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2107 if (ret < 0) 2108 return ret; 2109 2110 /* Map back into a voltage to verify we're still in bounds */ 2111 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2112 if (voltage < min_uV || voltage > max_uV) 2113 return -EINVAL; 2114 2115 return ret; 2116} 2117EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2118 2119static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2120 int min_uV, int max_uV) 2121{ 2122 int ret; 2123 int delay = 0; 2124 int best_val = 0; 2125 unsigned int selector; 2126 int old_selector = -1; 2127 2128 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2129 2130 min_uV += rdev->constraints->uV_offset; 2131 max_uV += rdev->constraints->uV_offset; 2132 2133 /* 2134 * If we can't obtain the old selector there is not enough 2135 * info to call set_voltage_time_sel(). 2136 */ 2137 if (_regulator_is_enabled(rdev) && 2138 rdev->desc->ops->set_voltage_time_sel && 2139 rdev->desc->ops->get_voltage_sel) { 2140 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2141 if (old_selector < 0) 2142 return old_selector; 2143 } 2144 2145 if (rdev->desc->ops->set_voltage) { 2146 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2147 &selector); 2148 2149 if (ret >= 0) { 2150 if (rdev->desc->ops->list_voltage) 2151 best_val = rdev->desc->ops->list_voltage(rdev, 2152 selector); 2153 else 2154 best_val = _regulator_get_voltage(rdev); 2155 } 2156 2157 } else if (rdev->desc->ops->set_voltage_sel) { 2158 if (rdev->desc->ops->map_voltage) { 2159 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2160 max_uV); 2161 } else { 2162 if (rdev->desc->ops->list_voltage == 2163 regulator_list_voltage_linear) 2164 ret = regulator_map_voltage_linear(rdev, 2165 min_uV, max_uV); 2166 else 2167 ret = regulator_map_voltage_iterate(rdev, 2168 min_uV, max_uV); 2169 } 2170 2171 if (ret >= 0) { 2172 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2173 if (min_uV <= best_val && max_uV >= best_val) { 2174 selector = ret; 2175 ret = rdev->desc->ops->set_voltage_sel(rdev, 2176 ret); 2177 } else { 2178 ret = -EINVAL; 2179 } 2180 } 2181 } else { 2182 ret = -EINVAL; 2183 } 2184 2185 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2186 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2187 rdev->desc->ops->set_voltage_time_sel) { 2188 2189 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2190 old_selector, selector); 2191 if (delay < 0) { 2192 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2193 delay); 2194 delay = 0; 2195 } 2196 2197 /* Insert any necessary delays */ 2198 if (delay >= 1000) { 2199 mdelay(delay / 1000); 2200 udelay(delay % 1000); 2201 } else if (delay) { 2202 udelay(delay); 2203 } 2204 } 2205 2206 if (ret == 0 && best_val >= 0) 2207 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2208 (void *)best_val); 2209 2210 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2211 2212 return ret; 2213} 2214 2215/** 2216 * regulator_set_voltage - set regulator output voltage 2217 * @regulator: regulator source 2218 * @min_uV: Minimum required voltage in uV 2219 * @max_uV: Maximum acceptable voltage in uV 2220 * 2221 * Sets a voltage regulator to the desired output voltage. This can be set 2222 * during any regulator state. IOW, regulator can be disabled or enabled. 2223 * 2224 * If the regulator is enabled then the voltage will change to the new value 2225 * immediately otherwise if the regulator is disabled the regulator will 2226 * output at the new voltage when enabled. 2227 * 2228 * NOTE: If the regulator is shared between several devices then the lowest 2229 * request voltage that meets the system constraints will be used. 2230 * Regulator system constraints must be set for this regulator before 2231 * calling this function otherwise this call will fail. 2232 */ 2233int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2234{ 2235 struct regulator_dev *rdev = regulator->rdev; 2236 int ret = 0; 2237 2238 mutex_lock(&rdev->mutex); 2239 2240 /* If we're setting the same range as last time the change 2241 * should be a noop (some cpufreq implementations use the same 2242 * voltage for multiple frequencies, for example). 2243 */ 2244 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2245 goto out; 2246 2247 /* sanity check */ 2248 if (!rdev->desc->ops->set_voltage && 2249 !rdev->desc->ops->set_voltage_sel) { 2250 ret = -EINVAL; 2251 goto out; 2252 } 2253 2254 /* constraints check */ 2255 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2256 if (ret < 0) 2257 goto out; 2258 regulator->min_uV = min_uV; 2259 regulator->max_uV = max_uV; 2260 2261 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2262 if (ret < 0) 2263 goto out; 2264 2265 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2266 2267out: 2268 mutex_unlock(&rdev->mutex); 2269 return ret; 2270} 2271EXPORT_SYMBOL_GPL(regulator_set_voltage); 2272 2273/** 2274 * regulator_set_voltage_time - get raise/fall time 2275 * @regulator: regulator source 2276 * @old_uV: starting voltage in microvolts 2277 * @new_uV: target voltage in microvolts 2278 * 2279 * Provided with the starting and ending voltage, this function attempts to 2280 * calculate the time in microseconds required to rise or fall to this new 2281 * voltage. 2282 */ 2283int regulator_set_voltage_time(struct regulator *regulator, 2284 int old_uV, int new_uV) 2285{ 2286 struct regulator_dev *rdev = regulator->rdev; 2287 struct regulator_ops *ops = rdev->desc->ops; 2288 int old_sel = -1; 2289 int new_sel = -1; 2290 int voltage; 2291 int i; 2292 2293 /* Currently requires operations to do this */ 2294 if (!ops->list_voltage || !ops->set_voltage_time_sel 2295 || !rdev->desc->n_voltages) 2296 return -EINVAL; 2297 2298 for (i = 0; i < rdev->desc->n_voltages; i++) { 2299 /* We only look for exact voltage matches here */ 2300 voltage = regulator_list_voltage(regulator, i); 2301 if (voltage < 0) 2302 return -EINVAL; 2303 if (voltage == 0) 2304 continue; 2305 if (voltage == old_uV) 2306 old_sel = i; 2307 if (voltage == new_uV) 2308 new_sel = i; 2309 } 2310 2311 if (old_sel < 0 || new_sel < 0) 2312 return -EINVAL; 2313 2314 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2315} 2316EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2317 2318/** 2319 *regulator_set_voltage_time_sel - get raise/fall time 2320 * @regulator: regulator source 2321 * @old_selector: selector for starting voltage 2322 * @new_selector: selector for target voltage 2323 * 2324 * Provided with the starting and target voltage selectors, this function 2325 * returns time in microseconds required to rise or fall to this new voltage 2326 * 2327 * Drivers providing ramp_delay in regulation_constraints can use this as their 2328 * set_voltage_time_sel() operation. 2329 */ 2330int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2331 unsigned int old_selector, 2332 unsigned int new_selector) 2333{ 2334 unsigned int ramp_delay = 0; 2335 int old_volt, new_volt; 2336 2337 if (rdev->constraints->ramp_delay) 2338 ramp_delay = rdev->constraints->ramp_delay; 2339 else if (rdev->desc->ramp_delay) 2340 ramp_delay = rdev->desc->ramp_delay; 2341 2342 if (ramp_delay == 0) { 2343 rdev_warn(rdev, "ramp_delay not set\n"); 2344 return 0; 2345 } 2346 2347 /* sanity check */ 2348 if (!rdev->desc->ops->list_voltage) 2349 return -EINVAL; 2350 2351 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2352 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2353 2354 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2355} 2356EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2357 2358/** 2359 * regulator_sync_voltage - re-apply last regulator output voltage 2360 * @regulator: regulator source 2361 * 2362 * Re-apply the last configured voltage. This is intended to be used 2363 * where some external control source the consumer is cooperating with 2364 * has caused the configured voltage to change. 2365 */ 2366int regulator_sync_voltage(struct regulator *regulator) 2367{ 2368 struct regulator_dev *rdev = regulator->rdev; 2369 int ret, min_uV, max_uV; 2370 2371 mutex_lock(&rdev->mutex); 2372 2373 if (!rdev->desc->ops->set_voltage && 2374 !rdev->desc->ops->set_voltage_sel) { 2375 ret = -EINVAL; 2376 goto out; 2377 } 2378 2379 /* This is only going to work if we've had a voltage configured. */ 2380 if (!regulator->min_uV && !regulator->max_uV) { 2381 ret = -EINVAL; 2382 goto out; 2383 } 2384 2385 min_uV = regulator->min_uV; 2386 max_uV = regulator->max_uV; 2387 2388 /* This should be a paranoia check... */ 2389 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2390 if (ret < 0) 2391 goto out; 2392 2393 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2394 if (ret < 0) 2395 goto out; 2396 2397 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2398 2399out: 2400 mutex_unlock(&rdev->mutex); 2401 return ret; 2402} 2403EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2404 2405static int _regulator_get_voltage(struct regulator_dev *rdev) 2406{ 2407 int sel, ret; 2408 2409 if (rdev->desc->ops->get_voltage_sel) { 2410 sel = rdev->desc->ops->get_voltage_sel(rdev); 2411 if (sel < 0) 2412 return sel; 2413 ret = rdev->desc->ops->list_voltage(rdev, sel); 2414 } else if (rdev->desc->ops->get_voltage) { 2415 ret = rdev->desc->ops->get_voltage(rdev); 2416 } else { 2417 return -EINVAL; 2418 } 2419 2420 if (ret < 0) 2421 return ret; 2422 return ret - rdev->constraints->uV_offset; 2423} 2424 2425/** 2426 * regulator_get_voltage - get regulator output voltage 2427 * @regulator: regulator source 2428 * 2429 * This returns the current regulator voltage in uV. 2430 * 2431 * NOTE: If the regulator is disabled it will return the voltage value. This 2432 * function should not be used to determine regulator state. 2433 */ 2434int regulator_get_voltage(struct regulator *regulator) 2435{ 2436 int ret; 2437 2438 mutex_lock(®ulator->rdev->mutex); 2439 2440 ret = _regulator_get_voltage(regulator->rdev); 2441 2442 mutex_unlock(®ulator->rdev->mutex); 2443 2444 return ret; 2445} 2446EXPORT_SYMBOL_GPL(regulator_get_voltage); 2447 2448/** 2449 * regulator_set_current_limit - set regulator output current limit 2450 * @regulator: regulator source 2451 * @min_uA: Minimuum supported current in uA 2452 * @max_uA: Maximum supported current in uA 2453 * 2454 * Sets current sink to the desired output current. This can be set during 2455 * any regulator state. IOW, regulator can be disabled or enabled. 2456 * 2457 * If the regulator is enabled then the current will change to the new value 2458 * immediately otherwise if the regulator is disabled the regulator will 2459 * output at the new current when enabled. 2460 * 2461 * NOTE: Regulator system constraints must be set for this regulator before 2462 * calling this function otherwise this call will fail. 2463 */ 2464int regulator_set_current_limit(struct regulator *regulator, 2465 int min_uA, int max_uA) 2466{ 2467 struct regulator_dev *rdev = regulator->rdev; 2468 int ret; 2469 2470 mutex_lock(&rdev->mutex); 2471 2472 /* sanity check */ 2473 if (!rdev->desc->ops->set_current_limit) { 2474 ret = -EINVAL; 2475 goto out; 2476 } 2477 2478 /* constraints check */ 2479 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2480 if (ret < 0) 2481 goto out; 2482 2483 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2484out: 2485 mutex_unlock(&rdev->mutex); 2486 return ret; 2487} 2488EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2489 2490static int _regulator_get_current_limit(struct regulator_dev *rdev) 2491{ 2492 int ret; 2493 2494 mutex_lock(&rdev->mutex); 2495 2496 /* sanity check */ 2497 if (!rdev->desc->ops->get_current_limit) { 2498 ret = -EINVAL; 2499 goto out; 2500 } 2501 2502 ret = rdev->desc->ops->get_current_limit(rdev); 2503out: 2504 mutex_unlock(&rdev->mutex); 2505 return ret; 2506} 2507 2508/** 2509 * regulator_get_current_limit - get regulator output current 2510 * @regulator: regulator source 2511 * 2512 * This returns the current supplied by the specified current sink in uA. 2513 * 2514 * NOTE: If the regulator is disabled it will return the current value. This 2515 * function should not be used to determine regulator state. 2516 */ 2517int regulator_get_current_limit(struct regulator *regulator) 2518{ 2519 return _regulator_get_current_limit(regulator->rdev); 2520} 2521EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2522 2523/** 2524 * regulator_set_mode - set regulator operating mode 2525 * @regulator: regulator source 2526 * @mode: operating mode - one of the REGULATOR_MODE constants 2527 * 2528 * Set regulator operating mode to increase regulator efficiency or improve 2529 * regulation performance. 2530 * 2531 * NOTE: Regulator system constraints must be set for this regulator before 2532 * calling this function otherwise this call will fail. 2533 */ 2534int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2535{ 2536 struct regulator_dev *rdev = regulator->rdev; 2537 int ret; 2538 int regulator_curr_mode; 2539 2540 mutex_lock(&rdev->mutex); 2541 2542 /* sanity check */ 2543 if (!rdev->desc->ops->set_mode) { 2544 ret = -EINVAL; 2545 goto out; 2546 } 2547 2548 /* return if the same mode is requested */ 2549 if (rdev->desc->ops->get_mode) { 2550 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2551 if (regulator_curr_mode == mode) { 2552 ret = 0; 2553 goto out; 2554 } 2555 } 2556 2557 /* constraints check */ 2558 ret = regulator_mode_constrain(rdev, &mode); 2559 if (ret < 0) 2560 goto out; 2561 2562 ret = rdev->desc->ops->set_mode(rdev, mode); 2563out: 2564 mutex_unlock(&rdev->mutex); 2565 return ret; 2566} 2567EXPORT_SYMBOL_GPL(regulator_set_mode); 2568 2569static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2570{ 2571 int ret; 2572 2573 mutex_lock(&rdev->mutex); 2574 2575 /* sanity check */ 2576 if (!rdev->desc->ops->get_mode) { 2577 ret = -EINVAL; 2578 goto out; 2579 } 2580 2581 ret = rdev->desc->ops->get_mode(rdev); 2582out: 2583 mutex_unlock(&rdev->mutex); 2584 return ret; 2585} 2586 2587/** 2588 * regulator_get_mode - get regulator operating mode 2589 * @regulator: regulator source 2590 * 2591 * Get the current regulator operating mode. 2592 */ 2593unsigned int regulator_get_mode(struct regulator *regulator) 2594{ 2595 return _regulator_get_mode(regulator->rdev); 2596} 2597EXPORT_SYMBOL_GPL(regulator_get_mode); 2598 2599/** 2600 * regulator_set_optimum_mode - set regulator optimum operating mode 2601 * @regulator: regulator source 2602 * @uA_load: load current 2603 * 2604 * Notifies the regulator core of a new device load. This is then used by 2605 * DRMS (if enabled by constraints) to set the most efficient regulator 2606 * operating mode for the new regulator loading. 2607 * 2608 * Consumer devices notify their supply regulator of the maximum power 2609 * they will require (can be taken from device datasheet in the power 2610 * consumption tables) when they change operational status and hence power 2611 * state. Examples of operational state changes that can affect power 2612 * consumption are :- 2613 * 2614 * o Device is opened / closed. 2615 * o Device I/O is about to begin or has just finished. 2616 * o Device is idling in between work. 2617 * 2618 * This information is also exported via sysfs to userspace. 2619 * 2620 * DRMS will sum the total requested load on the regulator and change 2621 * to the most efficient operating mode if platform constraints allow. 2622 * 2623 * Returns the new regulator mode or error. 2624 */ 2625int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2626{ 2627 struct regulator_dev *rdev = regulator->rdev; 2628 struct regulator *consumer; 2629 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2630 unsigned int mode; 2631 2632 if (rdev->supply) 2633 input_uV = regulator_get_voltage(rdev->supply); 2634 2635 mutex_lock(&rdev->mutex); 2636 2637 /* 2638 * first check to see if we can set modes at all, otherwise just 2639 * tell the consumer everything is OK. 2640 */ 2641 regulator->uA_load = uA_load; 2642 ret = regulator_check_drms(rdev); 2643 if (ret < 0) { 2644 ret = 0; 2645 goto out; 2646 } 2647 2648 if (!rdev->desc->ops->get_optimum_mode) 2649 goto out; 2650 2651 /* 2652 * we can actually do this so any errors are indicators of 2653 * potential real failure. 2654 */ 2655 ret = -EINVAL; 2656 2657 if (!rdev->desc->ops->set_mode) 2658 goto out; 2659 2660 /* get output voltage */ 2661 output_uV = _regulator_get_voltage(rdev); 2662 if (output_uV <= 0) { 2663 rdev_err(rdev, "invalid output voltage found\n"); 2664 goto out; 2665 } 2666 2667 /* No supply? Use constraint voltage */ 2668 if (input_uV <= 0) 2669 input_uV = rdev->constraints->input_uV; 2670 if (input_uV <= 0) { 2671 rdev_err(rdev, "invalid input voltage found\n"); 2672 goto out; 2673 } 2674 2675 /* calc total requested load for this regulator */ 2676 list_for_each_entry(consumer, &rdev->consumer_list, list) 2677 total_uA_load += consumer->uA_load; 2678 2679 mode = rdev->desc->ops->get_optimum_mode(rdev, 2680 input_uV, output_uV, 2681 total_uA_load); 2682 ret = regulator_mode_constrain(rdev, &mode); 2683 if (ret < 0) { 2684 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2685 total_uA_load, input_uV, output_uV); 2686 goto out; 2687 } 2688 2689 ret = rdev->desc->ops->set_mode(rdev, mode); 2690 if (ret < 0) { 2691 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2692 goto out; 2693 } 2694 ret = mode; 2695out: 2696 mutex_unlock(&rdev->mutex); 2697 return ret; 2698} 2699EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2700 2701/** 2702 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2703 * 2704 * @rdev: device to operate on. 2705 * @enable: state to set. 2706 */ 2707int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2708{ 2709 unsigned int val; 2710 2711 if (enable) 2712 val = rdev->desc->bypass_mask; 2713 else 2714 val = 0; 2715 2716 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2717 rdev->desc->bypass_mask, val); 2718} 2719EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2720 2721/** 2722 * regulator_get_bypass_regmap - Default get_bypass() using regmap 2723 * 2724 * @rdev: device to operate on. 2725 * @enable: current state. 2726 */ 2727int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 2728{ 2729 unsigned int val; 2730 int ret; 2731 2732 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 2733 if (ret != 0) 2734 return ret; 2735 2736 *enable = val & rdev->desc->bypass_mask; 2737 2738 return 0; 2739} 2740EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 2741 2742/** 2743 * regulator_allow_bypass - allow the regulator to go into bypass mode 2744 * 2745 * @regulator: Regulator to configure 2746 * @allow: enable or disable bypass mode 2747 * 2748 * Allow the regulator to go into bypass mode if all other consumers 2749 * for the regulator also enable bypass mode and the machine 2750 * constraints allow this. Bypass mode means that the regulator is 2751 * simply passing the input directly to the output with no regulation. 2752 */ 2753int regulator_allow_bypass(struct regulator *regulator, bool enable) 2754{ 2755 struct regulator_dev *rdev = regulator->rdev; 2756 int ret = 0; 2757 2758 if (!rdev->desc->ops->set_bypass) 2759 return 0; 2760 2761 if (rdev->constraints && 2762 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2763 return 0; 2764 2765 mutex_lock(&rdev->mutex); 2766 2767 if (enable && !regulator->bypass) { 2768 rdev->bypass_count++; 2769 2770 if (rdev->bypass_count == rdev->open_count) { 2771 ret = rdev->desc->ops->set_bypass(rdev, enable); 2772 if (ret != 0) 2773 rdev->bypass_count--; 2774 } 2775 2776 } else if (!enable && regulator->bypass) { 2777 rdev->bypass_count--; 2778 2779 if (rdev->bypass_count != rdev->open_count) { 2780 ret = rdev->desc->ops->set_bypass(rdev, enable); 2781 if (ret != 0) 2782 rdev->bypass_count++; 2783 } 2784 } 2785 2786 if (ret == 0) 2787 regulator->bypass = enable; 2788 2789 mutex_unlock(&rdev->mutex); 2790 2791 return ret; 2792} 2793EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2794 2795/** 2796 * regulator_register_notifier - register regulator event notifier 2797 * @regulator: regulator source 2798 * @nb: notifier block 2799 * 2800 * Register notifier block to receive regulator events. 2801 */ 2802int regulator_register_notifier(struct regulator *regulator, 2803 struct notifier_block *nb) 2804{ 2805 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2806 nb); 2807} 2808EXPORT_SYMBOL_GPL(regulator_register_notifier); 2809 2810/** 2811 * regulator_unregister_notifier - unregister regulator event notifier 2812 * @regulator: regulator source 2813 * @nb: notifier block 2814 * 2815 * Unregister regulator event notifier block. 2816 */ 2817int regulator_unregister_notifier(struct regulator *regulator, 2818 struct notifier_block *nb) 2819{ 2820 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2821 nb); 2822} 2823EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2824 2825/* notify regulator consumers and downstream regulator consumers. 2826 * Note mutex must be held by caller. 2827 */ 2828static void _notifier_call_chain(struct regulator_dev *rdev, 2829 unsigned long event, void *data) 2830{ 2831 /* call rdev chain first */ 2832 blocking_notifier_call_chain(&rdev->notifier, event, data); 2833} 2834 2835/** 2836 * regulator_bulk_get - get multiple regulator consumers 2837 * 2838 * @dev: Device to supply 2839 * @num_consumers: Number of consumers to register 2840 * @consumers: Configuration of consumers; clients are stored here. 2841 * 2842 * @return 0 on success, an errno on failure. 2843 * 2844 * This helper function allows drivers to get several regulator 2845 * consumers in one operation. If any of the regulators cannot be 2846 * acquired then any regulators that were allocated will be freed 2847 * before returning to the caller. 2848 */ 2849int regulator_bulk_get(struct device *dev, int num_consumers, 2850 struct regulator_bulk_data *consumers) 2851{ 2852 int i; 2853 int ret; 2854 2855 for (i = 0; i < num_consumers; i++) 2856 consumers[i].consumer = NULL; 2857 2858 for (i = 0; i < num_consumers; i++) { 2859 consumers[i].consumer = regulator_get(dev, 2860 consumers[i].supply); 2861 if (IS_ERR(consumers[i].consumer)) { 2862 ret = PTR_ERR(consumers[i].consumer); 2863 dev_err(dev, "Failed to get supply '%s': %d\n", 2864 consumers[i].supply, ret); 2865 consumers[i].consumer = NULL; 2866 goto err; 2867 } 2868 } 2869 2870 return 0; 2871 2872err: 2873 while (--i >= 0) 2874 regulator_put(consumers[i].consumer); 2875 2876 return ret; 2877} 2878EXPORT_SYMBOL_GPL(regulator_bulk_get); 2879 2880/** 2881 * devm_regulator_bulk_get - managed get multiple regulator consumers 2882 * 2883 * @dev: Device to supply 2884 * @num_consumers: Number of consumers to register 2885 * @consumers: Configuration of consumers; clients are stored here. 2886 * 2887 * @return 0 on success, an errno on failure. 2888 * 2889 * This helper function allows drivers to get several regulator 2890 * consumers in one operation with management, the regulators will 2891 * automatically be freed when the device is unbound. If any of the 2892 * regulators cannot be acquired then any regulators that were 2893 * allocated will be freed before returning to the caller. 2894 */ 2895int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2896 struct regulator_bulk_data *consumers) 2897{ 2898 int i; 2899 int ret; 2900 2901 for (i = 0; i < num_consumers; i++) 2902 consumers[i].consumer = NULL; 2903 2904 for (i = 0; i < num_consumers; i++) { 2905 consumers[i].consumer = devm_regulator_get(dev, 2906 consumers[i].supply); 2907 if (IS_ERR(consumers[i].consumer)) { 2908 ret = PTR_ERR(consumers[i].consumer); 2909 dev_err(dev, "Failed to get supply '%s': %d\n", 2910 consumers[i].supply, ret); 2911 consumers[i].consumer = NULL; 2912 goto err; 2913 } 2914 } 2915 2916 return 0; 2917 2918err: 2919 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2920 devm_regulator_put(consumers[i].consumer); 2921 2922 return ret; 2923} 2924EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2925 2926static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2927{ 2928 struct regulator_bulk_data *bulk = data; 2929 2930 bulk->ret = regulator_enable(bulk->consumer); 2931} 2932 2933/** 2934 * regulator_bulk_enable - enable multiple regulator consumers 2935 * 2936 * @num_consumers: Number of consumers 2937 * @consumers: Consumer data; clients are stored here. 2938 * @return 0 on success, an errno on failure 2939 * 2940 * This convenience API allows consumers to enable multiple regulator 2941 * clients in a single API call. If any consumers cannot be enabled 2942 * then any others that were enabled will be disabled again prior to 2943 * return. 2944 */ 2945int regulator_bulk_enable(int num_consumers, 2946 struct regulator_bulk_data *consumers) 2947{ 2948 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2949 int i; 2950 int ret = 0; 2951 2952 for (i = 0; i < num_consumers; i++) { 2953 if (consumers[i].consumer->always_on) 2954 consumers[i].ret = 0; 2955 else 2956 async_schedule_domain(regulator_bulk_enable_async, 2957 &consumers[i], &async_domain); 2958 } 2959 2960 async_synchronize_full_domain(&async_domain); 2961 2962 /* If any consumer failed we need to unwind any that succeeded */ 2963 for (i = 0; i < num_consumers; i++) { 2964 if (consumers[i].ret != 0) { 2965 ret = consumers[i].ret; 2966 goto err; 2967 } 2968 } 2969 2970 return 0; 2971 2972err: 2973 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2974 while (--i >= 0) 2975 regulator_disable(consumers[i].consumer); 2976 2977 return ret; 2978} 2979EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2980 2981/** 2982 * regulator_bulk_disable - disable multiple regulator consumers 2983 * 2984 * @num_consumers: Number of consumers 2985 * @consumers: Consumer data; clients are stored here. 2986 * @return 0 on success, an errno on failure 2987 * 2988 * This convenience API allows consumers to disable multiple regulator 2989 * clients in a single API call. If any consumers cannot be disabled 2990 * then any others that were disabled will be enabled again prior to 2991 * return. 2992 */ 2993int regulator_bulk_disable(int num_consumers, 2994 struct regulator_bulk_data *consumers) 2995{ 2996 int i; 2997 int ret, r; 2998 2999 for (i = num_consumers - 1; i >= 0; --i) { 3000 ret = regulator_disable(consumers[i].consumer); 3001 if (ret != 0) 3002 goto err; 3003 } 3004 3005 return 0; 3006 3007err: 3008 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3009 for (++i; i < num_consumers; ++i) { 3010 r = regulator_enable(consumers[i].consumer); 3011 if (r != 0) 3012 pr_err("Failed to reename %s: %d\n", 3013 consumers[i].supply, r); 3014 } 3015 3016 return ret; 3017} 3018EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3019 3020/** 3021 * regulator_bulk_force_disable - force disable multiple regulator consumers 3022 * 3023 * @num_consumers: Number of consumers 3024 * @consumers: Consumer data; clients are stored here. 3025 * @return 0 on success, an errno on failure 3026 * 3027 * This convenience API allows consumers to forcibly disable multiple regulator 3028 * clients in a single API call. 3029 * NOTE: This should be used for situations when device damage will 3030 * likely occur if the regulators are not disabled (e.g. over temp). 3031 * Although regulator_force_disable function call for some consumers can 3032 * return error numbers, the function is called for all consumers. 3033 */ 3034int regulator_bulk_force_disable(int num_consumers, 3035 struct regulator_bulk_data *consumers) 3036{ 3037 int i; 3038 int ret; 3039 3040 for (i = 0; i < num_consumers; i++) 3041 consumers[i].ret = 3042 regulator_force_disable(consumers[i].consumer); 3043 3044 for (i = 0; i < num_consumers; i++) { 3045 if (consumers[i].ret != 0) { 3046 ret = consumers[i].ret; 3047 goto out; 3048 } 3049 } 3050 3051 return 0; 3052out: 3053 return ret; 3054} 3055EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3056 3057/** 3058 * regulator_bulk_free - free multiple regulator consumers 3059 * 3060 * @num_consumers: Number of consumers 3061 * @consumers: Consumer data; clients are stored here. 3062 * 3063 * This convenience API allows consumers to free multiple regulator 3064 * clients in a single API call. 3065 */ 3066void regulator_bulk_free(int num_consumers, 3067 struct regulator_bulk_data *consumers) 3068{ 3069 int i; 3070 3071 for (i = 0; i < num_consumers; i++) { 3072 regulator_put(consumers[i].consumer); 3073 consumers[i].consumer = NULL; 3074 } 3075} 3076EXPORT_SYMBOL_GPL(regulator_bulk_free); 3077 3078/** 3079 * regulator_notifier_call_chain - call regulator event notifier 3080 * @rdev: regulator source 3081 * @event: notifier block 3082 * @data: callback-specific data. 3083 * 3084 * Called by regulator drivers to notify clients a regulator event has 3085 * occurred. We also notify regulator clients downstream. 3086 * Note lock must be held by caller. 3087 */ 3088int regulator_notifier_call_chain(struct regulator_dev *rdev, 3089 unsigned long event, void *data) 3090{ 3091 _notifier_call_chain(rdev, event, data); 3092 return NOTIFY_DONE; 3093 3094} 3095EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3096 3097/** 3098 * regulator_mode_to_status - convert a regulator mode into a status 3099 * 3100 * @mode: Mode to convert 3101 * 3102 * Convert a regulator mode into a status. 3103 */ 3104int regulator_mode_to_status(unsigned int mode) 3105{ 3106 switch (mode) { 3107 case REGULATOR_MODE_FAST: 3108 return REGULATOR_STATUS_FAST; 3109 case REGULATOR_MODE_NORMAL: 3110 return REGULATOR_STATUS_NORMAL; 3111 case REGULATOR_MODE_IDLE: 3112 return REGULATOR_STATUS_IDLE; 3113 case REGULATOR_MODE_STANDBY: 3114 return REGULATOR_STATUS_STANDBY; 3115 default: 3116 return REGULATOR_STATUS_UNDEFINED; 3117 } 3118} 3119EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3120 3121/* 3122 * To avoid cluttering sysfs (and memory) with useless state, only 3123 * create attributes that can be meaningfully displayed. 3124 */ 3125static int add_regulator_attributes(struct regulator_dev *rdev) 3126{ 3127 struct device *dev = &rdev->dev; 3128 struct regulator_ops *ops = rdev->desc->ops; 3129 int status = 0; 3130 3131 /* some attributes need specific methods to be displayed */ 3132 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3133 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 3134 status = device_create_file(dev, &dev_attr_microvolts); 3135 if (status < 0) 3136 return status; 3137 } 3138 if (ops->get_current_limit) { 3139 status = device_create_file(dev, &dev_attr_microamps); 3140 if (status < 0) 3141 return status; 3142 } 3143 if (ops->get_mode) { 3144 status = device_create_file(dev, &dev_attr_opmode); 3145 if (status < 0) 3146 return status; 3147 } 3148 if (ops->is_enabled) { 3149 status = device_create_file(dev, &dev_attr_state); 3150 if (status < 0) 3151 return status; 3152 } 3153 if (ops->get_status) { 3154 status = device_create_file(dev, &dev_attr_status); 3155 if (status < 0) 3156 return status; 3157 } 3158 if (ops->get_bypass) { 3159 status = device_create_file(dev, &dev_attr_bypass); 3160 if (status < 0) 3161 return status; 3162 } 3163 3164 /* some attributes are type-specific */ 3165 if (rdev->desc->type == REGULATOR_CURRENT) { 3166 status = device_create_file(dev, &dev_attr_requested_microamps); 3167 if (status < 0) 3168 return status; 3169 } 3170 3171 /* all the other attributes exist to support constraints; 3172 * don't show them if there are no constraints, or if the 3173 * relevant supporting methods are missing. 3174 */ 3175 if (!rdev->constraints) 3176 return status; 3177 3178 /* constraints need specific supporting methods */ 3179 if (ops->set_voltage || ops->set_voltage_sel) { 3180 status = device_create_file(dev, &dev_attr_min_microvolts); 3181 if (status < 0) 3182 return status; 3183 status = device_create_file(dev, &dev_attr_max_microvolts); 3184 if (status < 0) 3185 return status; 3186 } 3187 if (ops->set_current_limit) { 3188 status = device_create_file(dev, &dev_attr_min_microamps); 3189 if (status < 0) 3190 return status; 3191 status = device_create_file(dev, &dev_attr_max_microamps); 3192 if (status < 0) 3193 return status; 3194 } 3195 3196 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3197 if (status < 0) 3198 return status; 3199 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3200 if (status < 0) 3201 return status; 3202 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3203 if (status < 0) 3204 return status; 3205 3206 if (ops->set_suspend_voltage) { 3207 status = device_create_file(dev, 3208 &dev_attr_suspend_standby_microvolts); 3209 if (status < 0) 3210 return status; 3211 status = device_create_file(dev, 3212 &dev_attr_suspend_mem_microvolts); 3213 if (status < 0) 3214 return status; 3215 status = device_create_file(dev, 3216 &dev_attr_suspend_disk_microvolts); 3217 if (status < 0) 3218 return status; 3219 } 3220 3221 if (ops->set_suspend_mode) { 3222 status = device_create_file(dev, 3223 &dev_attr_suspend_standby_mode); 3224 if (status < 0) 3225 return status; 3226 status = device_create_file(dev, 3227 &dev_attr_suspend_mem_mode); 3228 if (status < 0) 3229 return status; 3230 status = device_create_file(dev, 3231 &dev_attr_suspend_disk_mode); 3232 if (status < 0) 3233 return status; 3234 } 3235 3236 return status; 3237} 3238 3239static void rdev_init_debugfs(struct regulator_dev *rdev) 3240{ 3241 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3242 if (!rdev->debugfs) { 3243 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3244 return; 3245 } 3246 3247 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3248 &rdev->use_count); 3249 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3250 &rdev->open_count); 3251 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3252 &rdev->bypass_count); 3253} 3254 3255/** 3256 * regulator_register - register regulator 3257 * @regulator_desc: regulator to register 3258 * @config: runtime configuration for regulator 3259 * 3260 * Called by regulator drivers to register a regulator. 3261 * Returns 0 on success. 3262 */ 3263struct regulator_dev * 3264regulator_register(const struct regulator_desc *regulator_desc, 3265 const struct regulator_config *config) 3266{ 3267 const struct regulation_constraints *constraints = NULL; 3268 const struct regulator_init_data *init_data; 3269 static atomic_t regulator_no = ATOMIC_INIT(0); 3270 struct regulator_dev *rdev; 3271 struct device *dev; 3272 int ret, i; 3273 const char *supply = NULL; 3274 3275 if (regulator_desc == NULL || config == NULL) 3276 return ERR_PTR(-EINVAL); 3277 3278 dev = config->dev; 3279 WARN_ON(!dev); 3280 3281 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3282 return ERR_PTR(-EINVAL); 3283 3284 if (regulator_desc->type != REGULATOR_VOLTAGE && 3285 regulator_desc->type != REGULATOR_CURRENT) 3286 return ERR_PTR(-EINVAL); 3287 3288 /* Only one of each should be implemented */ 3289 WARN_ON(regulator_desc->ops->get_voltage && 3290 regulator_desc->ops->get_voltage_sel); 3291 WARN_ON(regulator_desc->ops->set_voltage && 3292 regulator_desc->ops->set_voltage_sel); 3293 3294 /* If we're using selectors we must implement list_voltage. */ 3295 if (regulator_desc->ops->get_voltage_sel && 3296 !regulator_desc->ops->list_voltage) { 3297 return ERR_PTR(-EINVAL); 3298 } 3299 if (regulator_desc->ops->set_voltage_sel && 3300 !regulator_desc->ops->list_voltage) { 3301 return ERR_PTR(-EINVAL); 3302 } 3303 3304 init_data = config->init_data; 3305 3306 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3307 if (rdev == NULL) 3308 return ERR_PTR(-ENOMEM); 3309 3310 mutex_lock(®ulator_list_mutex); 3311 3312 mutex_init(&rdev->mutex); 3313 rdev->reg_data = config->driver_data; 3314 rdev->owner = regulator_desc->owner; 3315 rdev->desc = regulator_desc; 3316 if (config->regmap) 3317 rdev->regmap = config->regmap; 3318 else 3319 rdev->regmap = dev_get_regmap(dev, NULL); 3320 INIT_LIST_HEAD(&rdev->consumer_list); 3321 INIT_LIST_HEAD(&rdev->list); 3322 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3323 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3324 3325 /* preform any regulator specific init */ 3326 if (init_data && init_data->regulator_init) { 3327 ret = init_data->regulator_init(rdev->reg_data); 3328 if (ret < 0) 3329 goto clean; 3330 } 3331 3332 /* register with sysfs */ 3333 rdev->dev.class = ®ulator_class; 3334 rdev->dev.of_node = config->of_node; 3335 rdev->dev.parent = dev; 3336 dev_set_name(&rdev->dev, "regulator.%d", 3337 atomic_inc_return(®ulator_no) - 1); 3338 ret = device_register(&rdev->dev); 3339 if (ret != 0) { 3340 put_device(&rdev->dev); 3341 goto clean; 3342 } 3343 3344 dev_set_drvdata(&rdev->dev, rdev); 3345 3346 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3347 ret = gpio_request_one(config->ena_gpio, 3348 GPIOF_DIR_OUT | config->ena_gpio_flags, 3349 rdev_get_name(rdev)); 3350 if (ret != 0) { 3351 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3352 config->ena_gpio, ret); 3353 goto clean; 3354 } 3355 3356 rdev->ena_gpio = config->ena_gpio; 3357 rdev->ena_gpio_invert = config->ena_gpio_invert; 3358 3359 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3360 rdev->ena_gpio_state = 1; 3361 3362 if (rdev->ena_gpio_invert) 3363 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3364 } 3365 3366 /* set regulator constraints */ 3367 if (init_data) 3368 constraints = &init_data->constraints; 3369 3370 ret = set_machine_constraints(rdev, constraints); 3371 if (ret < 0) 3372 goto scrub; 3373 3374 /* add attributes supported by this regulator */ 3375 ret = add_regulator_attributes(rdev); 3376 if (ret < 0) 3377 goto scrub; 3378 3379 if (init_data && init_data->supply_regulator) 3380 supply = init_data->supply_regulator; 3381 else if (regulator_desc->supply_name) 3382 supply = regulator_desc->supply_name; 3383 3384 if (supply) { 3385 struct regulator_dev *r; 3386 3387 r = regulator_dev_lookup(dev, supply, &ret); 3388 3389 if (!r) { 3390 dev_err(dev, "Failed to find supply %s\n", supply); 3391 ret = -EPROBE_DEFER; 3392 goto scrub; 3393 } 3394 3395 ret = set_supply(rdev, r); 3396 if (ret < 0) 3397 goto scrub; 3398 3399 /* Enable supply if rail is enabled */ 3400 if (_regulator_is_enabled(rdev)) { 3401 ret = regulator_enable(rdev->supply); 3402 if (ret < 0) 3403 goto scrub; 3404 } 3405 } 3406 3407 /* add consumers devices */ 3408 if (init_data) { 3409 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3410 ret = set_consumer_device_supply(rdev, 3411 init_data->consumer_supplies[i].dev_name, 3412 init_data->consumer_supplies[i].supply); 3413 if (ret < 0) { 3414 dev_err(dev, "Failed to set supply %s\n", 3415 init_data->consumer_supplies[i].supply); 3416 goto unset_supplies; 3417 } 3418 } 3419 } 3420 3421 list_add(&rdev->list, ®ulator_list); 3422 3423 rdev_init_debugfs(rdev); 3424out: 3425 mutex_unlock(®ulator_list_mutex); 3426 return rdev; 3427 3428unset_supplies: 3429 unset_regulator_supplies(rdev); 3430 3431scrub: 3432 if (rdev->supply) 3433 regulator_put(rdev->supply); 3434 if (rdev->ena_gpio) 3435 gpio_free(rdev->ena_gpio); 3436 kfree(rdev->constraints); 3437 device_unregister(&rdev->dev); 3438 /* device core frees rdev */ 3439 rdev = ERR_PTR(ret); 3440 goto out; 3441 3442clean: 3443 kfree(rdev); 3444 rdev = ERR_PTR(ret); 3445 goto out; 3446} 3447EXPORT_SYMBOL_GPL(regulator_register); 3448 3449/** 3450 * regulator_unregister - unregister regulator 3451 * @rdev: regulator to unregister 3452 * 3453 * Called by regulator drivers to unregister a regulator. 3454 */ 3455void regulator_unregister(struct regulator_dev *rdev) 3456{ 3457 if (rdev == NULL) 3458 return; 3459 3460 if (rdev->supply) 3461 regulator_put(rdev->supply); 3462 mutex_lock(®ulator_list_mutex); 3463 debugfs_remove_recursive(rdev->debugfs); 3464 flush_work_sync(&rdev->disable_work.work); 3465 WARN_ON(rdev->open_count); 3466 unset_regulator_supplies(rdev); 3467 list_del(&rdev->list); 3468 kfree(rdev->constraints); 3469 if (rdev->ena_gpio) 3470 gpio_free(rdev->ena_gpio); 3471 device_unregister(&rdev->dev); 3472 mutex_unlock(®ulator_list_mutex); 3473} 3474EXPORT_SYMBOL_GPL(regulator_unregister); 3475 3476/** 3477 * regulator_suspend_prepare - prepare regulators for system wide suspend 3478 * @state: system suspend state 3479 * 3480 * Configure each regulator with it's suspend operating parameters for state. 3481 * This will usually be called by machine suspend code prior to supending. 3482 */ 3483int regulator_suspend_prepare(suspend_state_t state) 3484{ 3485 struct regulator_dev *rdev; 3486 int ret = 0; 3487 3488 /* ON is handled by regulator active state */ 3489 if (state == PM_SUSPEND_ON) 3490 return -EINVAL; 3491 3492 mutex_lock(®ulator_list_mutex); 3493 list_for_each_entry(rdev, ®ulator_list, list) { 3494 3495 mutex_lock(&rdev->mutex); 3496 ret = suspend_prepare(rdev, state); 3497 mutex_unlock(&rdev->mutex); 3498 3499 if (ret < 0) { 3500 rdev_err(rdev, "failed to prepare\n"); 3501 goto out; 3502 } 3503 } 3504out: 3505 mutex_unlock(®ulator_list_mutex); 3506 return ret; 3507} 3508EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3509 3510/** 3511 * regulator_suspend_finish - resume regulators from system wide suspend 3512 * 3513 * Turn on regulators that might be turned off by regulator_suspend_prepare 3514 * and that should be turned on according to the regulators properties. 3515 */ 3516int regulator_suspend_finish(void) 3517{ 3518 struct regulator_dev *rdev; 3519 int ret = 0, error; 3520 3521 mutex_lock(®ulator_list_mutex); 3522 list_for_each_entry(rdev, ®ulator_list, list) { 3523 struct regulator_ops *ops = rdev->desc->ops; 3524 3525 mutex_lock(&rdev->mutex); 3526 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3527 ops->enable) { 3528 error = ops->enable(rdev); 3529 if (error) 3530 ret = error; 3531 } else { 3532 if (!has_full_constraints) 3533 goto unlock; 3534 if (!ops->disable) 3535 goto unlock; 3536 if (!_regulator_is_enabled(rdev)) 3537 goto unlock; 3538 3539 error = ops->disable(rdev); 3540 if (error) 3541 ret = error; 3542 } 3543unlock: 3544 mutex_unlock(&rdev->mutex); 3545 } 3546 mutex_unlock(®ulator_list_mutex); 3547 return ret; 3548} 3549EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3550 3551/** 3552 * regulator_has_full_constraints - the system has fully specified constraints 3553 * 3554 * Calling this function will cause the regulator API to disable all 3555 * regulators which have a zero use count and don't have an always_on 3556 * constraint in a late_initcall. 3557 * 3558 * The intention is that this will become the default behaviour in a 3559 * future kernel release so users are encouraged to use this facility 3560 * now. 3561 */ 3562void regulator_has_full_constraints(void) 3563{ 3564 has_full_constraints = 1; 3565} 3566EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3567 3568/** 3569 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3570 * 3571 * Calling this function will cause the regulator API to provide a 3572 * dummy regulator to consumers if no physical regulator is found, 3573 * allowing most consumers to proceed as though a regulator were 3574 * configured. This allows systems such as those with software 3575 * controllable regulators for the CPU core only to be brought up more 3576 * readily. 3577 */ 3578void regulator_use_dummy_regulator(void) 3579{ 3580 board_wants_dummy_regulator = true; 3581} 3582EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3583 3584/** 3585 * rdev_get_drvdata - get rdev regulator driver data 3586 * @rdev: regulator 3587 * 3588 * Get rdev regulator driver private data. This call can be used in the 3589 * regulator driver context. 3590 */ 3591void *rdev_get_drvdata(struct regulator_dev *rdev) 3592{ 3593 return rdev->reg_data; 3594} 3595EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3596 3597/** 3598 * regulator_get_drvdata - get regulator driver data 3599 * @regulator: regulator 3600 * 3601 * Get regulator driver private data. This call can be used in the consumer 3602 * driver context when non API regulator specific functions need to be called. 3603 */ 3604void *regulator_get_drvdata(struct regulator *regulator) 3605{ 3606 return regulator->rdev->reg_data; 3607} 3608EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3609 3610/** 3611 * regulator_set_drvdata - set regulator driver data 3612 * @regulator: regulator 3613 * @data: data 3614 */ 3615void regulator_set_drvdata(struct regulator *regulator, void *data) 3616{ 3617 regulator->rdev->reg_data = data; 3618} 3619EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3620 3621/** 3622 * regulator_get_id - get regulator ID 3623 * @rdev: regulator 3624 */ 3625int rdev_get_id(struct regulator_dev *rdev) 3626{ 3627 return rdev->desc->id; 3628} 3629EXPORT_SYMBOL_GPL(rdev_get_id); 3630 3631struct device *rdev_get_dev(struct regulator_dev *rdev) 3632{ 3633 return &rdev->dev; 3634} 3635EXPORT_SYMBOL_GPL(rdev_get_dev); 3636 3637void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3638{ 3639 return reg_init_data->driver_data; 3640} 3641EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3642 3643#ifdef CONFIG_DEBUG_FS 3644static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3645 size_t count, loff_t *ppos) 3646{ 3647 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3648 ssize_t len, ret = 0; 3649 struct regulator_map *map; 3650 3651 if (!buf) 3652 return -ENOMEM; 3653 3654 list_for_each_entry(map, ®ulator_map_list, list) { 3655 len = snprintf(buf + ret, PAGE_SIZE - ret, 3656 "%s -> %s.%s\n", 3657 rdev_get_name(map->regulator), map->dev_name, 3658 map->supply); 3659 if (len >= 0) 3660 ret += len; 3661 if (ret > PAGE_SIZE) { 3662 ret = PAGE_SIZE; 3663 break; 3664 } 3665 } 3666 3667 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3668 3669 kfree(buf); 3670 3671 return ret; 3672} 3673#endif 3674 3675static const struct file_operations supply_map_fops = { 3676#ifdef CONFIG_DEBUG_FS 3677 .read = supply_map_read_file, 3678 .llseek = default_llseek, 3679#endif 3680}; 3681 3682static int __init regulator_init(void) 3683{ 3684 int ret; 3685 3686 ret = class_register(®ulator_class); 3687 3688 debugfs_root = debugfs_create_dir("regulator", NULL); 3689 if (!debugfs_root) 3690 pr_warn("regulator: Failed to create debugfs directory\n"); 3691 3692 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3693 &supply_map_fops); 3694 3695 regulator_dummy_init(); 3696 3697 return ret; 3698} 3699 3700/* init early to allow our consumers to complete system booting */ 3701core_initcall(regulator_init); 3702 3703static int __init regulator_init_complete(void) 3704{ 3705 struct regulator_dev *rdev; 3706 struct regulator_ops *ops; 3707 struct regulation_constraints *c; 3708 int enabled, ret; 3709 3710 /* 3711 * Since DT doesn't provide an idiomatic mechanism for 3712 * enabling full constraints and since it's much more natural 3713 * with DT to provide them just assume that a DT enabled 3714 * system has full constraints. 3715 */ 3716 if (of_have_populated_dt()) 3717 has_full_constraints = true; 3718 3719 mutex_lock(®ulator_list_mutex); 3720 3721 /* If we have a full configuration then disable any regulators 3722 * which are not in use or always_on. This will become the 3723 * default behaviour in the future. 3724 */ 3725 list_for_each_entry(rdev, ®ulator_list, list) { 3726 ops = rdev->desc->ops; 3727 c = rdev->constraints; 3728 3729 if (!ops->disable || (c && c->always_on)) 3730 continue; 3731 3732 mutex_lock(&rdev->mutex); 3733 3734 if (rdev->use_count) 3735 goto unlock; 3736 3737 /* If we can't read the status assume it's on. */ 3738 if (ops->is_enabled) 3739 enabled = ops->is_enabled(rdev); 3740 else 3741 enabled = 1; 3742 3743 if (!enabled) 3744 goto unlock; 3745 3746 if (has_full_constraints) { 3747 /* We log since this may kill the system if it 3748 * goes wrong. */ 3749 rdev_info(rdev, "disabling\n"); 3750 ret = ops->disable(rdev); 3751 if (ret != 0) { 3752 rdev_err(rdev, "couldn't disable: %d\n", ret); 3753 } 3754 } else { 3755 /* The intention is that in future we will 3756 * assume that full constraints are provided 3757 * so warn even if we aren't going to do 3758 * anything here. 3759 */ 3760 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3761 } 3762 3763unlock: 3764 mutex_unlock(&rdev->mutex); 3765 } 3766 3767 mutex_unlock(®ulator_list_mutex); 3768 3769 return 0; 3770} 3771late_initcall(regulator_init_complete); 3772