core.c revision bcda432194fc7c4a2dbe9d7146f00b4b21e66c8c
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#define pr_fmt(fmt) "%s: " fmt, __func__ 17 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/debugfs.h> 21#include <linux/device.h> 22#include <linux/slab.h> 23#include <linux/async.h> 24#include <linux/err.h> 25#include <linux/mutex.h> 26#include <linux/suspend.h> 27#include <linux/delay.h> 28#include <linux/of.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 57#ifdef CONFIG_DEBUG_FS 58static struct dentry *debugfs_root; 59#endif 60 61/* 62 * struct regulator_map 63 * 64 * Used to provide symbolic supply names to devices. 65 */ 66struct regulator_map { 67 struct list_head list; 68 const char *dev_name; /* The dev_name() for the consumer */ 69 const char *supply; 70 struct regulator_dev *regulator; 71}; 72 73/* 74 * struct regulator 75 * 76 * One for each consumer device. 77 */ 78struct regulator { 79 struct device *dev; 80 struct list_head list; 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#ifdef CONFIG_DEBUG_FS 88 struct dentry *debugfs; 89#endif 90}; 91 92static int _regulator_is_enabled(struct regulator_dev *rdev); 93static int _regulator_disable(struct regulator_dev *rdev); 94static int _regulator_get_voltage(struct regulator_dev *rdev); 95static int _regulator_get_current_limit(struct regulator_dev *rdev); 96static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 97static void _notifier_call_chain(struct regulator_dev *rdev, 98 unsigned long event, void *data); 99static int _regulator_do_set_voltage(struct regulator_dev *rdev, 100 int min_uV, int max_uV); 101static struct regulator *create_regulator(struct regulator_dev *rdev, 102 struct device *dev, 103 const char *supply_name); 104 105static const char *rdev_get_name(struct regulator_dev *rdev) 106{ 107 if (rdev->constraints && rdev->constraints->name) 108 return rdev->constraints->name; 109 else if (rdev->desc->name) 110 return rdev->desc->name; 111 else 112 return ""; 113} 114 115/* gets the regulator for a given consumer device */ 116static struct regulator *get_device_regulator(struct device *dev) 117{ 118 struct regulator *regulator = NULL; 119 struct regulator_dev *rdev; 120 121 mutex_lock(®ulator_list_mutex); 122 list_for_each_entry(rdev, ®ulator_list, list) { 123 mutex_lock(&rdev->mutex); 124 list_for_each_entry(regulator, &rdev->consumer_list, list) { 125 if (regulator->dev == dev) { 126 mutex_unlock(&rdev->mutex); 127 mutex_unlock(®ulator_list_mutex); 128 return regulator; 129 } 130 } 131 mutex_unlock(&rdev->mutex); 132 } 133 mutex_unlock(®ulator_list_mutex); 134 return NULL; 135} 136 137/** 138 * of_get_regulator - get a regulator device node based on supply name 139 * @dev: Device pointer for the consumer (of regulator) device 140 * @supply: regulator supply name 141 * 142 * Extract the regulator device node corresponding to the supply name. 143 * retruns the device node corresponding to the regulator if found, else 144 * returns NULL. 145 */ 146static struct device_node *of_get_regulator(struct device *dev, const char *supply) 147{ 148 struct device_node *regnode = NULL; 149 char prop_name[32]; /* 32 is max size of property name */ 150 151 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 152 153 snprintf(prop_name, 32, "%s-supply", supply); 154 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 155 156 if (!regnode) { 157 dev_warn(dev, "%s property in node %s references invalid phandle", 158 prop_name, dev->of_node->full_name); 159 return NULL; 160 } 161 return regnode; 162} 163 164/* Platform voltage constraint check */ 165static int regulator_check_voltage(struct regulator_dev *rdev, 166 int *min_uV, int *max_uV) 167{ 168 BUG_ON(*min_uV > *max_uV); 169 170 if (!rdev->constraints) { 171 rdev_err(rdev, "no constraints\n"); 172 return -ENODEV; 173 } 174 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 175 rdev_err(rdev, "operation not allowed\n"); 176 return -EPERM; 177 } 178 179 if (*max_uV > rdev->constraints->max_uV) 180 *max_uV = rdev->constraints->max_uV; 181 if (*min_uV < rdev->constraints->min_uV) 182 *min_uV = rdev->constraints->min_uV; 183 184 if (*min_uV > *max_uV) { 185 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 186 *min_uV, *max_uV); 187 return -EINVAL; 188 } 189 190 return 0; 191} 192 193/* Make sure we select a voltage that suits the needs of all 194 * regulator consumers 195 */ 196static int regulator_check_consumers(struct regulator_dev *rdev, 197 int *min_uV, int *max_uV) 198{ 199 struct regulator *regulator; 200 201 list_for_each_entry(regulator, &rdev->consumer_list, list) { 202 /* 203 * Assume consumers that didn't say anything are OK 204 * with anything in the constraint range. 205 */ 206 if (!regulator->min_uV && !regulator->max_uV) 207 continue; 208 209 if (*max_uV > regulator->max_uV) 210 *max_uV = regulator->max_uV; 211 if (*min_uV < regulator->min_uV) 212 *min_uV = regulator->min_uV; 213 } 214 215 if (*min_uV > *max_uV) 216 return -EINVAL; 217 218 return 0; 219} 220 221/* current constraint check */ 222static int regulator_check_current_limit(struct regulator_dev *rdev, 223 int *min_uA, int *max_uA) 224{ 225 BUG_ON(*min_uA > *max_uA); 226 227 if (!rdev->constraints) { 228 rdev_err(rdev, "no constraints\n"); 229 return -ENODEV; 230 } 231 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 232 rdev_err(rdev, "operation not allowed\n"); 233 return -EPERM; 234 } 235 236 if (*max_uA > rdev->constraints->max_uA) 237 *max_uA = rdev->constraints->max_uA; 238 if (*min_uA < rdev->constraints->min_uA) 239 *min_uA = rdev->constraints->min_uA; 240 241 if (*min_uA > *max_uA) { 242 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 243 *min_uA, *max_uA); 244 return -EINVAL; 245 } 246 247 return 0; 248} 249 250/* operating mode constraint check */ 251static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 252{ 253 switch (*mode) { 254 case REGULATOR_MODE_FAST: 255 case REGULATOR_MODE_NORMAL: 256 case REGULATOR_MODE_IDLE: 257 case REGULATOR_MODE_STANDBY: 258 break; 259 default: 260 rdev_err(rdev, "invalid mode %x specified\n", *mode); 261 return -EINVAL; 262 } 263 264 if (!rdev->constraints) { 265 rdev_err(rdev, "no constraints\n"); 266 return -ENODEV; 267 } 268 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 269 rdev_err(rdev, "operation not allowed\n"); 270 return -EPERM; 271 } 272 273 /* The modes are bitmasks, the most power hungry modes having 274 * the lowest values. If the requested mode isn't supported 275 * try higher modes. */ 276 while (*mode) { 277 if (rdev->constraints->valid_modes_mask & *mode) 278 return 0; 279 *mode /= 2; 280 } 281 282 return -EINVAL; 283} 284 285/* dynamic regulator mode switching constraint check */ 286static int regulator_check_drms(struct regulator_dev *rdev) 287{ 288 if (!rdev->constraints) { 289 rdev_err(rdev, "no constraints\n"); 290 return -ENODEV; 291 } 292 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 293 rdev_err(rdev, "operation not allowed\n"); 294 return -EPERM; 295 } 296 return 0; 297} 298 299static ssize_t device_requested_uA_show(struct device *dev, 300 struct device_attribute *attr, char *buf) 301{ 302 struct regulator *regulator; 303 304 regulator = get_device_regulator(dev); 305 if (regulator == NULL) 306 return 0; 307 308 return sprintf(buf, "%d\n", regulator->uA_load); 309} 310 311static ssize_t regulator_uV_show(struct device *dev, 312 struct device_attribute *attr, char *buf) 313{ 314 struct regulator_dev *rdev = dev_get_drvdata(dev); 315 ssize_t ret; 316 317 mutex_lock(&rdev->mutex); 318 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 319 mutex_unlock(&rdev->mutex); 320 321 return ret; 322} 323static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 324 325static ssize_t regulator_uA_show(struct device *dev, 326 struct device_attribute *attr, char *buf) 327{ 328 struct regulator_dev *rdev = dev_get_drvdata(dev); 329 330 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 331} 332static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 333 334static ssize_t regulator_name_show(struct device *dev, 335 struct device_attribute *attr, char *buf) 336{ 337 struct regulator_dev *rdev = dev_get_drvdata(dev); 338 339 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 340} 341 342static ssize_t regulator_print_opmode(char *buf, int mode) 343{ 344 switch (mode) { 345 case REGULATOR_MODE_FAST: 346 return sprintf(buf, "fast\n"); 347 case REGULATOR_MODE_NORMAL: 348 return sprintf(buf, "normal\n"); 349 case REGULATOR_MODE_IDLE: 350 return sprintf(buf, "idle\n"); 351 case REGULATOR_MODE_STANDBY: 352 return sprintf(buf, "standby\n"); 353 } 354 return sprintf(buf, "unknown\n"); 355} 356 357static ssize_t regulator_opmode_show(struct device *dev, 358 struct device_attribute *attr, char *buf) 359{ 360 struct regulator_dev *rdev = dev_get_drvdata(dev); 361 362 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 363} 364static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 365 366static ssize_t regulator_print_state(char *buf, int state) 367{ 368 if (state > 0) 369 return sprintf(buf, "enabled\n"); 370 else if (state == 0) 371 return sprintf(buf, "disabled\n"); 372 else 373 return sprintf(buf, "unknown\n"); 374} 375 376static ssize_t regulator_state_show(struct device *dev, 377 struct device_attribute *attr, char *buf) 378{ 379 struct regulator_dev *rdev = dev_get_drvdata(dev); 380 ssize_t ret; 381 382 mutex_lock(&rdev->mutex); 383 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 384 mutex_unlock(&rdev->mutex); 385 386 return ret; 387} 388static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 389 390static ssize_t regulator_status_show(struct device *dev, 391 struct device_attribute *attr, char *buf) 392{ 393 struct regulator_dev *rdev = dev_get_drvdata(dev); 394 int status; 395 char *label; 396 397 status = rdev->desc->ops->get_status(rdev); 398 if (status < 0) 399 return status; 400 401 switch (status) { 402 case REGULATOR_STATUS_OFF: 403 label = "off"; 404 break; 405 case REGULATOR_STATUS_ON: 406 label = "on"; 407 break; 408 case REGULATOR_STATUS_ERROR: 409 label = "error"; 410 break; 411 case REGULATOR_STATUS_FAST: 412 label = "fast"; 413 break; 414 case REGULATOR_STATUS_NORMAL: 415 label = "normal"; 416 break; 417 case REGULATOR_STATUS_IDLE: 418 label = "idle"; 419 break; 420 case REGULATOR_STATUS_STANDBY: 421 label = "standby"; 422 break; 423 default: 424 return -ERANGE; 425 } 426 427 return sprintf(buf, "%s\n", label); 428} 429static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 430 431static ssize_t regulator_min_uA_show(struct device *dev, 432 struct device_attribute *attr, char *buf) 433{ 434 struct regulator_dev *rdev = dev_get_drvdata(dev); 435 436 if (!rdev->constraints) 437 return sprintf(buf, "constraint not defined\n"); 438 439 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 440} 441static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 442 443static ssize_t regulator_max_uA_show(struct device *dev, 444 struct device_attribute *attr, char *buf) 445{ 446 struct regulator_dev *rdev = dev_get_drvdata(dev); 447 448 if (!rdev->constraints) 449 return sprintf(buf, "constraint not defined\n"); 450 451 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 452} 453static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 454 455static ssize_t regulator_min_uV_show(struct device *dev, 456 struct device_attribute *attr, char *buf) 457{ 458 struct regulator_dev *rdev = dev_get_drvdata(dev); 459 460 if (!rdev->constraints) 461 return sprintf(buf, "constraint not defined\n"); 462 463 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 464} 465static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 466 467static ssize_t regulator_max_uV_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 472 if (!rdev->constraints) 473 return sprintf(buf, "constraint not defined\n"); 474 475 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 476} 477static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 478 479static ssize_t regulator_total_uA_show(struct device *dev, 480 struct device_attribute *attr, char *buf) 481{ 482 struct regulator_dev *rdev = dev_get_drvdata(dev); 483 struct regulator *regulator; 484 int uA = 0; 485 486 mutex_lock(&rdev->mutex); 487 list_for_each_entry(regulator, &rdev->consumer_list, list) 488 uA += regulator->uA_load; 489 mutex_unlock(&rdev->mutex); 490 return sprintf(buf, "%d\n", uA); 491} 492static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 493 494static ssize_t regulator_num_users_show(struct device *dev, 495 struct device_attribute *attr, char *buf) 496{ 497 struct regulator_dev *rdev = dev_get_drvdata(dev); 498 return sprintf(buf, "%d\n", rdev->use_count); 499} 500 501static ssize_t regulator_type_show(struct device *dev, 502 struct device_attribute *attr, char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514 515static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 516 struct device_attribute *attr, char *buf) 517{ 518 struct regulator_dev *rdev = dev_get_drvdata(dev); 519 520 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 521} 522static DEVICE_ATTR(suspend_mem_microvolts, 0444, 523 regulator_suspend_mem_uV_show, NULL); 524 525static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 526 struct device_attribute *attr, char *buf) 527{ 528 struct regulator_dev *rdev = dev_get_drvdata(dev); 529 530 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 531} 532static DEVICE_ATTR(suspend_disk_microvolts, 0444, 533 regulator_suspend_disk_uV_show, NULL); 534 535static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 536 struct device_attribute *attr, char *buf) 537{ 538 struct regulator_dev *rdev = dev_get_drvdata(dev); 539 540 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 541} 542static DEVICE_ATTR(suspend_standby_microvolts, 0444, 543 regulator_suspend_standby_uV_show, NULL); 544 545static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 546 struct device_attribute *attr, char *buf) 547{ 548 struct regulator_dev *rdev = dev_get_drvdata(dev); 549 550 return regulator_print_opmode(buf, 551 rdev->constraints->state_mem.mode); 552} 553static DEVICE_ATTR(suspend_mem_mode, 0444, 554 regulator_suspend_mem_mode_show, NULL); 555 556static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 557 struct device_attribute *attr, char *buf) 558{ 559 struct regulator_dev *rdev = dev_get_drvdata(dev); 560 561 return regulator_print_opmode(buf, 562 rdev->constraints->state_disk.mode); 563} 564static DEVICE_ATTR(suspend_disk_mode, 0444, 565 regulator_suspend_disk_mode_show, NULL); 566 567static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 568 struct device_attribute *attr, char *buf) 569{ 570 struct regulator_dev *rdev = dev_get_drvdata(dev); 571 572 return regulator_print_opmode(buf, 573 rdev->constraints->state_standby.mode); 574} 575static DEVICE_ATTR(suspend_standby_mode, 0444, 576 regulator_suspend_standby_mode_show, NULL); 577 578static ssize_t regulator_suspend_mem_state_show(struct device *dev, 579 struct device_attribute *attr, char *buf) 580{ 581 struct regulator_dev *rdev = dev_get_drvdata(dev); 582 583 return regulator_print_state(buf, 584 rdev->constraints->state_mem.enabled); 585} 586static DEVICE_ATTR(suspend_mem_state, 0444, 587 regulator_suspend_mem_state_show, NULL); 588 589static ssize_t regulator_suspend_disk_state_show(struct device *dev, 590 struct device_attribute *attr, char *buf) 591{ 592 struct regulator_dev *rdev = dev_get_drvdata(dev); 593 594 return regulator_print_state(buf, 595 rdev->constraints->state_disk.enabled); 596} 597static DEVICE_ATTR(suspend_disk_state, 0444, 598 regulator_suspend_disk_state_show, NULL); 599 600static ssize_t regulator_suspend_standby_state_show(struct device *dev, 601 struct device_attribute *attr, char *buf) 602{ 603 struct regulator_dev *rdev = dev_get_drvdata(dev); 604 605 return regulator_print_state(buf, 606 rdev->constraints->state_standby.enabled); 607} 608static DEVICE_ATTR(suspend_standby_state, 0444, 609 regulator_suspend_standby_state_show, NULL); 610 611 612/* 613 * These are the only attributes are present for all regulators. 614 * Other attributes are a function of regulator functionality. 615 */ 616static struct device_attribute regulator_dev_attrs[] = { 617 __ATTR(name, 0444, regulator_name_show, NULL), 618 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 619 __ATTR(type, 0444, regulator_type_show, NULL), 620 __ATTR_NULL, 621}; 622 623static void regulator_dev_release(struct device *dev) 624{ 625 struct regulator_dev *rdev = dev_get_drvdata(dev); 626 kfree(rdev); 627} 628 629static struct class regulator_class = { 630 .name = "regulator", 631 .dev_release = regulator_dev_release, 632 .dev_attrs = regulator_dev_attrs, 633}; 634 635/* Calculate the new optimum regulator operating mode based on the new total 636 * consumer load. All locks held by caller */ 637static void drms_uA_update(struct regulator_dev *rdev) 638{ 639 struct regulator *sibling; 640 int current_uA = 0, output_uV, input_uV, err; 641 unsigned int mode; 642 643 err = regulator_check_drms(rdev); 644 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 645 (!rdev->desc->ops->get_voltage && 646 !rdev->desc->ops->get_voltage_sel) || 647 !rdev->desc->ops->set_mode) 648 return; 649 650 /* get output voltage */ 651 output_uV = _regulator_get_voltage(rdev); 652 if (output_uV <= 0) 653 return; 654 655 /* get input voltage */ 656 input_uV = 0; 657 if (rdev->supply) 658 input_uV = _regulator_get_voltage(rdev); 659 if (input_uV <= 0) 660 input_uV = rdev->constraints->input_uV; 661 if (input_uV <= 0) 662 return; 663 664 /* calc total requested load */ 665 list_for_each_entry(sibling, &rdev->consumer_list, list) 666 current_uA += sibling->uA_load; 667 668 /* now get the optimum mode for our new total regulator load */ 669 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 670 output_uV, current_uA); 671 672 /* check the new mode is allowed */ 673 err = regulator_mode_constrain(rdev, &mode); 674 if (err == 0) 675 rdev->desc->ops->set_mode(rdev, mode); 676} 677 678static int suspend_set_state(struct regulator_dev *rdev, 679 struct regulator_state *rstate) 680{ 681 int ret = 0; 682 bool can_set_state; 683 684 can_set_state = rdev->desc->ops->set_suspend_enable && 685 rdev->desc->ops->set_suspend_disable; 686 687 /* If we have no suspend mode configration don't set anything; 688 * only warn if the driver actually makes the suspend mode 689 * configurable. 690 */ 691 if (!rstate->enabled && !rstate->disabled) { 692 if (can_set_state) 693 rdev_warn(rdev, "No configuration\n"); 694 return 0; 695 } 696 697 if (rstate->enabled && rstate->disabled) { 698 rdev_err(rdev, "invalid configuration\n"); 699 return -EINVAL; 700 } 701 702 if (!can_set_state) { 703 rdev_err(rdev, "no way to set suspend state\n"); 704 return -EINVAL; 705 } 706 707 if (rstate->enabled) 708 ret = rdev->desc->ops->set_suspend_enable(rdev); 709 else 710 ret = rdev->desc->ops->set_suspend_disable(rdev); 711 if (ret < 0) { 712 rdev_err(rdev, "failed to enabled/disable\n"); 713 return ret; 714 } 715 716 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 717 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 718 if (ret < 0) { 719 rdev_err(rdev, "failed to set voltage\n"); 720 return ret; 721 } 722 } 723 724 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 725 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 726 if (ret < 0) { 727 rdev_err(rdev, "failed to set mode\n"); 728 return ret; 729 } 730 } 731 return ret; 732} 733 734/* locks held by caller */ 735static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 736{ 737 if (!rdev->constraints) 738 return -EINVAL; 739 740 switch (state) { 741 case PM_SUSPEND_STANDBY: 742 return suspend_set_state(rdev, 743 &rdev->constraints->state_standby); 744 case PM_SUSPEND_MEM: 745 return suspend_set_state(rdev, 746 &rdev->constraints->state_mem); 747 case PM_SUSPEND_MAX: 748 return suspend_set_state(rdev, 749 &rdev->constraints->state_disk); 750 default: 751 return -EINVAL; 752 } 753} 754 755static void print_constraints(struct regulator_dev *rdev) 756{ 757 struct regulation_constraints *constraints = rdev->constraints; 758 char buf[80] = ""; 759 int count = 0; 760 int ret; 761 762 if (constraints->min_uV && constraints->max_uV) { 763 if (constraints->min_uV == constraints->max_uV) 764 count += sprintf(buf + count, "%d mV ", 765 constraints->min_uV / 1000); 766 else 767 count += sprintf(buf + count, "%d <--> %d mV ", 768 constraints->min_uV / 1000, 769 constraints->max_uV / 1000); 770 } 771 772 if (!constraints->min_uV || 773 constraints->min_uV != constraints->max_uV) { 774 ret = _regulator_get_voltage(rdev); 775 if (ret > 0) 776 count += sprintf(buf + count, "at %d mV ", ret / 1000); 777 } 778 779 if (constraints->uV_offset) 780 count += sprintf(buf, "%dmV offset ", 781 constraints->uV_offset / 1000); 782 783 if (constraints->min_uA && constraints->max_uA) { 784 if (constraints->min_uA == constraints->max_uA) 785 count += sprintf(buf + count, "%d mA ", 786 constraints->min_uA / 1000); 787 else 788 count += sprintf(buf + count, "%d <--> %d mA ", 789 constraints->min_uA / 1000, 790 constraints->max_uA / 1000); 791 } 792 793 if (!constraints->min_uA || 794 constraints->min_uA != constraints->max_uA) { 795 ret = _regulator_get_current_limit(rdev); 796 if (ret > 0) 797 count += sprintf(buf + count, "at %d mA ", ret / 1000); 798 } 799 800 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 801 count += sprintf(buf + count, "fast "); 802 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 803 count += sprintf(buf + count, "normal "); 804 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 805 count += sprintf(buf + count, "idle "); 806 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 807 count += sprintf(buf + count, "standby"); 808 809 rdev_info(rdev, "%s\n", buf); 810} 811 812static int machine_constraints_voltage(struct regulator_dev *rdev, 813 struct regulation_constraints *constraints) 814{ 815 struct regulator_ops *ops = rdev->desc->ops; 816 int ret; 817 818 /* do we need to apply the constraint voltage */ 819 if (rdev->constraints->apply_uV && 820 rdev->constraints->min_uV == rdev->constraints->max_uV) { 821 ret = _regulator_do_set_voltage(rdev, 822 rdev->constraints->min_uV, 823 rdev->constraints->max_uV); 824 if (ret < 0) { 825 rdev_err(rdev, "failed to apply %duV constraint\n", 826 rdev->constraints->min_uV); 827 return ret; 828 } 829 } 830 831 /* constrain machine-level voltage specs to fit 832 * the actual range supported by this regulator. 833 */ 834 if (ops->list_voltage && rdev->desc->n_voltages) { 835 int count = rdev->desc->n_voltages; 836 int i; 837 int min_uV = INT_MAX; 838 int max_uV = INT_MIN; 839 int cmin = constraints->min_uV; 840 int cmax = constraints->max_uV; 841 842 /* it's safe to autoconfigure fixed-voltage supplies 843 and the constraints are used by list_voltage. */ 844 if (count == 1 && !cmin) { 845 cmin = 1; 846 cmax = INT_MAX; 847 constraints->min_uV = cmin; 848 constraints->max_uV = cmax; 849 } 850 851 /* voltage constraints are optional */ 852 if ((cmin == 0) && (cmax == 0)) 853 return 0; 854 855 /* else require explicit machine-level constraints */ 856 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 857 rdev_err(rdev, "invalid voltage constraints\n"); 858 return -EINVAL; 859 } 860 861 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 862 for (i = 0; i < count; i++) { 863 int value; 864 865 value = ops->list_voltage(rdev, i); 866 if (value <= 0) 867 continue; 868 869 /* maybe adjust [min_uV..max_uV] */ 870 if (value >= cmin && value < min_uV) 871 min_uV = value; 872 if (value <= cmax && value > max_uV) 873 max_uV = value; 874 } 875 876 /* final: [min_uV..max_uV] valid iff constraints valid */ 877 if (max_uV < min_uV) { 878 rdev_err(rdev, "unsupportable voltage constraints\n"); 879 return -EINVAL; 880 } 881 882 /* use regulator's subset of machine constraints */ 883 if (constraints->min_uV < min_uV) { 884 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 885 constraints->min_uV, min_uV); 886 constraints->min_uV = min_uV; 887 } 888 if (constraints->max_uV > max_uV) { 889 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 890 constraints->max_uV, max_uV); 891 constraints->max_uV = max_uV; 892 } 893 } 894 895 return 0; 896} 897 898/** 899 * set_machine_constraints - sets regulator constraints 900 * @rdev: regulator source 901 * @constraints: constraints to apply 902 * 903 * Allows platform initialisation code to define and constrain 904 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 905 * Constraints *must* be set by platform code in order for some 906 * regulator operations to proceed i.e. set_voltage, set_current_limit, 907 * set_mode. 908 */ 909static int set_machine_constraints(struct regulator_dev *rdev, 910 const struct regulation_constraints *constraints) 911{ 912 int ret = 0; 913 struct regulator_ops *ops = rdev->desc->ops; 914 915 if (constraints) 916 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 917 GFP_KERNEL); 918 else 919 rdev->constraints = kzalloc(sizeof(*constraints), 920 GFP_KERNEL); 921 if (!rdev->constraints) 922 return -ENOMEM; 923 924 ret = machine_constraints_voltage(rdev, rdev->constraints); 925 if (ret != 0) 926 goto out; 927 928 /* do we need to setup our suspend state */ 929 if (rdev->constraints->initial_state) { 930 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 931 if (ret < 0) { 932 rdev_err(rdev, "failed to set suspend state\n"); 933 goto out; 934 } 935 } 936 937 if (rdev->constraints->initial_mode) { 938 if (!ops->set_mode) { 939 rdev_err(rdev, "no set_mode operation\n"); 940 ret = -EINVAL; 941 goto out; 942 } 943 944 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 945 if (ret < 0) { 946 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 947 goto out; 948 } 949 } 950 951 /* If the constraints say the regulator should be on at this point 952 * and we have control then make sure it is enabled. 953 */ 954 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 955 ops->enable) { 956 ret = ops->enable(rdev); 957 if (ret < 0) { 958 rdev_err(rdev, "failed to enable\n"); 959 goto out; 960 } 961 } 962 963 print_constraints(rdev); 964 return 0; 965out: 966 kfree(rdev->constraints); 967 rdev->constraints = NULL; 968 return ret; 969} 970 971/** 972 * set_supply - set regulator supply regulator 973 * @rdev: regulator name 974 * @supply_rdev: supply regulator name 975 * 976 * Called by platform initialisation code to set the supply regulator for this 977 * regulator. This ensures that a regulators supply will also be enabled by the 978 * core if it's child is enabled. 979 */ 980static int set_supply(struct regulator_dev *rdev, 981 struct regulator_dev *supply_rdev) 982{ 983 int err; 984 985 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 986 987 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 988 if (IS_ERR(rdev->supply)) { 989 err = PTR_ERR(rdev->supply); 990 rdev->supply = NULL; 991 return err; 992 } 993 994 return 0; 995} 996 997/** 998 * set_consumer_device_supply - Bind a regulator to a symbolic supply 999 * @rdev: regulator source 1000 * @consumer_dev: device the supply applies to 1001 * @consumer_dev_name: dev_name() string for device supply applies to 1002 * @supply: symbolic name for supply 1003 * 1004 * Allows platform initialisation code to map physical regulator 1005 * sources to symbolic names for supplies for use by devices. Devices 1006 * should use these symbolic names to request regulators, avoiding the 1007 * need to provide board-specific regulator names as platform data. 1008 * 1009 * Only one of consumer_dev and consumer_dev_name may be specified. 1010 */ 1011static int set_consumer_device_supply(struct regulator_dev *rdev, 1012 struct device *consumer_dev, const char *consumer_dev_name, 1013 const char *supply) 1014{ 1015 struct regulator_map *node; 1016 int has_dev; 1017 1018 if (consumer_dev && consumer_dev_name) 1019 return -EINVAL; 1020 1021 if (!consumer_dev_name && consumer_dev) 1022 consumer_dev_name = dev_name(consumer_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 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 1044 dev_name(&node->regulator->dev), 1045 node->regulator->desc->name, 1046 supply, 1047 dev_name(&rdev->dev), rdev_get_name(rdev)); 1048 return -EBUSY; 1049 } 1050 1051 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1052 if (node == NULL) 1053 return -ENOMEM; 1054 1055 node->regulator = rdev; 1056 node->supply = supply; 1057 1058 if (has_dev) { 1059 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1060 if (node->dev_name == NULL) { 1061 kfree(node); 1062 return -ENOMEM; 1063 } 1064 } 1065 1066 list_add(&node->list, ®ulator_map_list); 1067 return 0; 1068} 1069 1070static void unset_regulator_supplies(struct regulator_dev *rdev) 1071{ 1072 struct regulator_map *node, *n; 1073 1074 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1075 if (rdev == node->regulator) { 1076 list_del(&node->list); 1077 kfree(node->dev_name); 1078 kfree(node); 1079 } 1080 } 1081} 1082 1083#define REG_STR_SIZE 64 1084 1085static struct regulator *create_regulator(struct regulator_dev *rdev, 1086 struct device *dev, 1087 const char *supply_name) 1088{ 1089 struct regulator *regulator; 1090 char buf[REG_STR_SIZE]; 1091 int err, size; 1092 1093 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1094 if (regulator == NULL) 1095 return NULL; 1096 1097 mutex_lock(&rdev->mutex); 1098 regulator->rdev = rdev; 1099 list_add(®ulator->list, &rdev->consumer_list); 1100 1101 if (dev) { 1102 /* create a 'requested_microamps_name' sysfs entry */ 1103 size = scnprintf(buf, REG_STR_SIZE, 1104 "microamps_requested_%s-%s", 1105 dev_name(dev), supply_name); 1106 if (size >= REG_STR_SIZE) 1107 goto overflow_err; 1108 1109 regulator->dev = dev; 1110 sysfs_attr_init(®ulator->dev_attr.attr); 1111 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1112 if (regulator->dev_attr.attr.name == NULL) 1113 goto attr_name_err; 1114 1115 regulator->dev_attr.attr.mode = 0444; 1116 regulator->dev_attr.show = device_requested_uA_show; 1117 err = device_create_file(dev, ®ulator->dev_attr); 1118 if (err < 0) { 1119 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1120 goto attr_name_err; 1121 } 1122 1123 /* also add a link to the device sysfs entry */ 1124 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1125 dev->kobj.name, supply_name); 1126 if (size >= REG_STR_SIZE) 1127 goto attr_err; 1128 1129 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1130 if (regulator->supply_name == NULL) 1131 goto attr_err; 1132 1133 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1134 buf); 1135 if (err) { 1136 rdev_warn(rdev, "could not add device link %s err %d\n", 1137 dev->kobj.name, err); 1138 goto link_name_err; 1139 } 1140 } else { 1141 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1142 if (regulator->supply_name == NULL) 1143 goto attr_err; 1144 } 1145 1146#ifdef CONFIG_DEBUG_FS 1147 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1148 rdev->debugfs); 1149 if (IS_ERR_OR_NULL(regulator->debugfs)) { 1150 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1151 regulator->debugfs = NULL; 1152 } else { 1153 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1154 ®ulator->uA_load); 1155 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1156 ®ulator->min_uV); 1157 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1158 ®ulator->max_uV); 1159 } 1160#endif 1161 1162 mutex_unlock(&rdev->mutex); 1163 return regulator; 1164link_name_err: 1165 kfree(regulator->supply_name); 1166attr_err: 1167 device_remove_file(regulator->dev, ®ulator->dev_attr); 1168attr_name_err: 1169 kfree(regulator->dev_attr.attr.name); 1170overflow_err: 1171 list_del(®ulator->list); 1172 kfree(regulator); 1173 mutex_unlock(&rdev->mutex); 1174 return NULL; 1175} 1176 1177static int _regulator_get_enable_time(struct regulator_dev *rdev) 1178{ 1179 if (!rdev->desc->ops->enable_time) 1180 return 0; 1181 return rdev->desc->ops->enable_time(rdev); 1182} 1183 1184static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1185 const char *supply) 1186{ 1187 struct regulator_dev *r; 1188 struct device_node *node; 1189 1190 /* first do a dt based lookup */ 1191 if (dev && dev->of_node) { 1192 node = of_get_regulator(dev, supply); 1193 if (node) 1194 list_for_each_entry(r, ®ulator_list, list) 1195 if (r->dev.parent && 1196 node == r->dev.of_node) 1197 return r; 1198 } 1199 1200 /* if not found, try doing it non-dt way */ 1201 list_for_each_entry(r, ®ulator_list, list) 1202 if (strcmp(rdev_get_name(r), supply) == 0) 1203 return r; 1204 1205 return NULL; 1206} 1207 1208/* Internal regulator request function */ 1209static struct regulator *_regulator_get(struct device *dev, const char *id, 1210 int exclusive) 1211{ 1212 struct regulator_dev *rdev; 1213 struct regulator_map *map; 1214 struct regulator *regulator = ERR_PTR(-ENODEV); 1215 const char *devname = NULL; 1216 int ret; 1217 1218 if (id == NULL) { 1219 pr_err("get() with no identifier\n"); 1220 return regulator; 1221 } 1222 1223 if (dev) 1224 devname = dev_name(dev); 1225 1226 mutex_lock(®ulator_list_mutex); 1227 1228 rdev = regulator_dev_lookup(dev, id); 1229 if (rdev) 1230 goto found; 1231 1232 list_for_each_entry(map, ®ulator_map_list, list) { 1233 /* If the mapping has a device set up it must match */ 1234 if (map->dev_name && 1235 (!devname || strcmp(map->dev_name, devname))) 1236 continue; 1237 1238 if (strcmp(map->supply, id) == 0) { 1239 rdev = map->regulator; 1240 goto found; 1241 } 1242 } 1243 1244 if (board_wants_dummy_regulator) { 1245 rdev = dummy_regulator_rdev; 1246 goto found; 1247 } 1248 1249#ifdef CONFIG_REGULATOR_DUMMY 1250 if (!devname) 1251 devname = "deviceless"; 1252 1253 /* If the board didn't flag that it was fully constrained then 1254 * substitute in a dummy regulator so consumers can continue. 1255 */ 1256 if (!has_full_constraints) { 1257 pr_warn("%s supply %s not found, using dummy regulator\n", 1258 devname, id); 1259 rdev = dummy_regulator_rdev; 1260 goto found; 1261 } 1262#endif 1263 1264 mutex_unlock(®ulator_list_mutex); 1265 return regulator; 1266 1267found: 1268 if (rdev->exclusive) { 1269 regulator = ERR_PTR(-EPERM); 1270 goto out; 1271 } 1272 1273 if (exclusive && rdev->open_count) { 1274 regulator = ERR_PTR(-EBUSY); 1275 goto out; 1276 } 1277 1278 if (!try_module_get(rdev->owner)) 1279 goto out; 1280 1281 regulator = create_regulator(rdev, dev, id); 1282 if (regulator == NULL) { 1283 regulator = ERR_PTR(-ENOMEM); 1284 module_put(rdev->owner); 1285 goto out; 1286 } 1287 1288 rdev->open_count++; 1289 if (exclusive) { 1290 rdev->exclusive = 1; 1291 1292 ret = _regulator_is_enabled(rdev); 1293 if (ret > 0) 1294 rdev->use_count = 1; 1295 else 1296 rdev->use_count = 0; 1297 } 1298 1299out: 1300 mutex_unlock(®ulator_list_mutex); 1301 1302 return regulator; 1303} 1304 1305/** 1306 * regulator_get - lookup and obtain a reference to a regulator. 1307 * @dev: device for regulator "consumer" 1308 * @id: Supply name or regulator ID. 1309 * 1310 * Returns a struct regulator corresponding to the regulator producer, 1311 * or IS_ERR() condition containing errno. 1312 * 1313 * Use of supply names configured via regulator_set_device_supply() is 1314 * strongly encouraged. It is recommended that the supply name used 1315 * should match the name used for the supply and/or the relevant 1316 * device pins in the datasheet. 1317 */ 1318struct regulator *regulator_get(struct device *dev, const char *id) 1319{ 1320 return _regulator_get(dev, id, 0); 1321} 1322EXPORT_SYMBOL_GPL(regulator_get); 1323 1324/** 1325 * regulator_get_exclusive - obtain exclusive access to a regulator. 1326 * @dev: device for regulator "consumer" 1327 * @id: Supply name or regulator ID. 1328 * 1329 * Returns a struct regulator corresponding to the regulator producer, 1330 * or IS_ERR() condition containing errno. Other consumers will be 1331 * unable to obtain this reference is held and the use count for the 1332 * regulator will be initialised to reflect the current state of the 1333 * regulator. 1334 * 1335 * This is intended for use by consumers which cannot tolerate shared 1336 * use of the regulator such as those which need to force the 1337 * regulator off for correct operation of the hardware they are 1338 * controlling. 1339 * 1340 * Use of supply names configured via regulator_set_device_supply() is 1341 * strongly encouraged. It is recommended that the supply name used 1342 * should match the name used for the supply and/or the relevant 1343 * device pins in the datasheet. 1344 */ 1345struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1346{ 1347 return _regulator_get(dev, id, 1); 1348} 1349EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1350 1351/** 1352 * regulator_put - "free" the regulator source 1353 * @regulator: regulator source 1354 * 1355 * Note: drivers must ensure that all regulator_enable calls made on this 1356 * regulator source are balanced by regulator_disable calls prior to calling 1357 * this function. 1358 */ 1359void regulator_put(struct regulator *regulator) 1360{ 1361 struct regulator_dev *rdev; 1362 1363 if (regulator == NULL || IS_ERR(regulator)) 1364 return; 1365 1366 mutex_lock(®ulator_list_mutex); 1367 rdev = regulator->rdev; 1368 1369#ifdef CONFIG_DEBUG_FS 1370 debugfs_remove_recursive(regulator->debugfs); 1371#endif 1372 1373 /* remove any sysfs entries */ 1374 if (regulator->dev) { 1375 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1376 device_remove_file(regulator->dev, ®ulator->dev_attr); 1377 kfree(regulator->dev_attr.attr.name); 1378 } 1379 kfree(regulator->supply_name); 1380 list_del(®ulator->list); 1381 kfree(regulator); 1382 1383 rdev->open_count--; 1384 rdev->exclusive = 0; 1385 1386 module_put(rdev->owner); 1387 mutex_unlock(®ulator_list_mutex); 1388} 1389EXPORT_SYMBOL_GPL(regulator_put); 1390 1391static int _regulator_can_change_status(struct regulator_dev *rdev) 1392{ 1393 if (!rdev->constraints) 1394 return 0; 1395 1396 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1397 return 1; 1398 else 1399 return 0; 1400} 1401 1402/* locks held by regulator_enable() */ 1403static int _regulator_enable(struct regulator_dev *rdev) 1404{ 1405 int ret, delay; 1406 1407 /* check voltage and requested load before enabling */ 1408 if (rdev->constraints && 1409 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1410 drms_uA_update(rdev); 1411 1412 if (rdev->use_count == 0) { 1413 /* The regulator may on if it's not switchable or left on */ 1414 ret = _regulator_is_enabled(rdev); 1415 if (ret == -EINVAL || ret == 0) { 1416 if (!_regulator_can_change_status(rdev)) 1417 return -EPERM; 1418 1419 if (!rdev->desc->ops->enable) 1420 return -EINVAL; 1421 1422 /* Query before enabling in case configuration 1423 * dependent. */ 1424 ret = _regulator_get_enable_time(rdev); 1425 if (ret >= 0) { 1426 delay = ret; 1427 } else { 1428 rdev_warn(rdev, "enable_time() failed: %d\n", 1429 ret); 1430 delay = 0; 1431 } 1432 1433 trace_regulator_enable(rdev_get_name(rdev)); 1434 1435 /* Allow the regulator to ramp; it would be useful 1436 * to extend this for bulk operations so that the 1437 * regulators can ramp together. */ 1438 ret = rdev->desc->ops->enable(rdev); 1439 if (ret < 0) 1440 return ret; 1441 1442 trace_regulator_enable_delay(rdev_get_name(rdev)); 1443 1444 if (delay >= 1000) { 1445 mdelay(delay / 1000); 1446 udelay(delay % 1000); 1447 } else if (delay) { 1448 udelay(delay); 1449 } 1450 1451 trace_regulator_enable_complete(rdev_get_name(rdev)); 1452 1453 } else if (ret < 0) { 1454 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1455 return ret; 1456 } 1457 /* Fallthrough on positive return values - already enabled */ 1458 } 1459 1460 rdev->use_count++; 1461 1462 return 0; 1463} 1464 1465/** 1466 * regulator_enable - enable regulator output 1467 * @regulator: regulator source 1468 * 1469 * Request that the regulator be enabled with the regulator output at 1470 * the predefined voltage or current value. Calls to regulator_enable() 1471 * must be balanced with calls to regulator_disable(). 1472 * 1473 * NOTE: the output value can be set by other drivers, boot loader or may be 1474 * hardwired in the regulator. 1475 */ 1476int regulator_enable(struct regulator *regulator) 1477{ 1478 struct regulator_dev *rdev = regulator->rdev; 1479 int ret = 0; 1480 1481 if (rdev->supply) { 1482 ret = regulator_enable(rdev->supply); 1483 if (ret != 0) 1484 return ret; 1485 } 1486 1487 mutex_lock(&rdev->mutex); 1488 ret = _regulator_enable(rdev); 1489 mutex_unlock(&rdev->mutex); 1490 1491 if (ret != 0 && rdev->supply) 1492 regulator_disable(rdev->supply); 1493 1494 return ret; 1495} 1496EXPORT_SYMBOL_GPL(regulator_enable); 1497 1498/* locks held by regulator_disable() */ 1499static int _regulator_disable(struct regulator_dev *rdev) 1500{ 1501 int ret = 0; 1502 1503 if (WARN(rdev->use_count <= 0, 1504 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1505 return -EIO; 1506 1507 /* are we the last user and permitted to disable ? */ 1508 if (rdev->use_count == 1 && 1509 (rdev->constraints && !rdev->constraints->always_on)) { 1510 1511 /* we are last user */ 1512 if (_regulator_can_change_status(rdev) && 1513 rdev->desc->ops->disable) { 1514 trace_regulator_disable(rdev_get_name(rdev)); 1515 1516 ret = rdev->desc->ops->disable(rdev); 1517 if (ret < 0) { 1518 rdev_err(rdev, "failed to disable\n"); 1519 return ret; 1520 } 1521 1522 trace_regulator_disable_complete(rdev_get_name(rdev)); 1523 1524 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1525 NULL); 1526 } 1527 1528 rdev->use_count = 0; 1529 } else if (rdev->use_count > 1) { 1530 1531 if (rdev->constraints && 1532 (rdev->constraints->valid_ops_mask & 1533 REGULATOR_CHANGE_DRMS)) 1534 drms_uA_update(rdev); 1535 1536 rdev->use_count--; 1537 } 1538 1539 return ret; 1540} 1541 1542/** 1543 * regulator_disable - disable regulator output 1544 * @regulator: regulator source 1545 * 1546 * Disable the regulator output voltage or current. Calls to 1547 * regulator_enable() must be balanced with calls to 1548 * regulator_disable(). 1549 * 1550 * NOTE: this will only disable the regulator output if no other consumer 1551 * devices have it enabled, the regulator device supports disabling and 1552 * machine constraints permit this operation. 1553 */ 1554int regulator_disable(struct regulator *regulator) 1555{ 1556 struct regulator_dev *rdev = regulator->rdev; 1557 int ret = 0; 1558 1559 mutex_lock(&rdev->mutex); 1560 ret = _regulator_disable(rdev); 1561 mutex_unlock(&rdev->mutex); 1562 1563 if (ret == 0 && rdev->supply) 1564 regulator_disable(rdev->supply); 1565 1566 return ret; 1567} 1568EXPORT_SYMBOL_GPL(regulator_disable); 1569 1570/* locks held by regulator_force_disable() */ 1571static int _regulator_force_disable(struct regulator_dev *rdev) 1572{ 1573 int ret = 0; 1574 1575 /* force disable */ 1576 if (rdev->desc->ops->disable) { 1577 /* ah well, who wants to live forever... */ 1578 ret = rdev->desc->ops->disable(rdev); 1579 if (ret < 0) { 1580 rdev_err(rdev, "failed to force disable\n"); 1581 return ret; 1582 } 1583 /* notify other consumers that power has been forced off */ 1584 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1585 REGULATOR_EVENT_DISABLE, NULL); 1586 } 1587 1588 return ret; 1589} 1590 1591/** 1592 * regulator_force_disable - force disable regulator output 1593 * @regulator: regulator source 1594 * 1595 * Forcibly disable the regulator output voltage or current. 1596 * NOTE: this *will* disable the regulator output even if other consumer 1597 * devices have it enabled. This should be used for situations when device 1598 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1599 */ 1600int regulator_force_disable(struct regulator *regulator) 1601{ 1602 struct regulator_dev *rdev = regulator->rdev; 1603 int ret; 1604 1605 mutex_lock(&rdev->mutex); 1606 regulator->uA_load = 0; 1607 ret = _regulator_force_disable(regulator->rdev); 1608 mutex_unlock(&rdev->mutex); 1609 1610 if (rdev->supply) 1611 while (rdev->open_count--) 1612 regulator_disable(rdev->supply); 1613 1614 return ret; 1615} 1616EXPORT_SYMBOL_GPL(regulator_force_disable); 1617 1618static void regulator_disable_work(struct work_struct *work) 1619{ 1620 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1621 disable_work.work); 1622 int count, i, ret; 1623 1624 mutex_lock(&rdev->mutex); 1625 1626 BUG_ON(!rdev->deferred_disables); 1627 1628 count = rdev->deferred_disables; 1629 rdev->deferred_disables = 0; 1630 1631 for (i = 0; i < count; i++) { 1632 ret = _regulator_disable(rdev); 1633 if (ret != 0) 1634 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1635 } 1636 1637 mutex_unlock(&rdev->mutex); 1638 1639 if (rdev->supply) { 1640 for (i = 0; i < count; i++) { 1641 ret = regulator_disable(rdev->supply); 1642 if (ret != 0) { 1643 rdev_err(rdev, 1644 "Supply disable failed: %d\n", ret); 1645 } 1646 } 1647 } 1648} 1649 1650/** 1651 * regulator_disable_deferred - disable regulator output with delay 1652 * @regulator: regulator source 1653 * @ms: miliseconds until the regulator is disabled 1654 * 1655 * Execute regulator_disable() on the regulator after a delay. This 1656 * is intended for use with devices that require some time to quiesce. 1657 * 1658 * NOTE: this will only disable the regulator output if no other consumer 1659 * devices have it enabled, the regulator device supports disabling and 1660 * machine constraints permit this operation. 1661 */ 1662int regulator_disable_deferred(struct regulator *regulator, int ms) 1663{ 1664 struct regulator_dev *rdev = regulator->rdev; 1665 int ret; 1666 1667 mutex_lock(&rdev->mutex); 1668 rdev->deferred_disables++; 1669 mutex_unlock(&rdev->mutex); 1670 1671 ret = schedule_delayed_work(&rdev->disable_work, 1672 msecs_to_jiffies(ms)); 1673 if (ret < 0) 1674 return ret; 1675 else 1676 return 0; 1677} 1678EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1679 1680static int _regulator_is_enabled(struct regulator_dev *rdev) 1681{ 1682 /* If we don't know then assume that the regulator is always on */ 1683 if (!rdev->desc->ops->is_enabled) 1684 return 1; 1685 1686 return rdev->desc->ops->is_enabled(rdev); 1687} 1688 1689/** 1690 * regulator_is_enabled - is the regulator output enabled 1691 * @regulator: regulator source 1692 * 1693 * Returns positive if the regulator driver backing the source/client 1694 * has requested that the device be enabled, zero if it hasn't, else a 1695 * negative errno code. 1696 * 1697 * Note that the device backing this regulator handle can have multiple 1698 * users, so it might be enabled even if regulator_enable() was never 1699 * called for this particular source. 1700 */ 1701int regulator_is_enabled(struct regulator *regulator) 1702{ 1703 int ret; 1704 1705 mutex_lock(®ulator->rdev->mutex); 1706 ret = _regulator_is_enabled(regulator->rdev); 1707 mutex_unlock(®ulator->rdev->mutex); 1708 1709 return ret; 1710} 1711EXPORT_SYMBOL_GPL(regulator_is_enabled); 1712 1713/** 1714 * regulator_count_voltages - count regulator_list_voltage() selectors 1715 * @regulator: regulator source 1716 * 1717 * Returns number of selectors, or negative errno. Selectors are 1718 * numbered starting at zero, and typically correspond to bitfields 1719 * in hardware registers. 1720 */ 1721int regulator_count_voltages(struct regulator *regulator) 1722{ 1723 struct regulator_dev *rdev = regulator->rdev; 1724 1725 return rdev->desc->n_voltages ? : -EINVAL; 1726} 1727EXPORT_SYMBOL_GPL(regulator_count_voltages); 1728 1729/** 1730 * regulator_list_voltage - enumerate supported voltages 1731 * @regulator: regulator source 1732 * @selector: identify voltage to list 1733 * Context: can sleep 1734 * 1735 * Returns a voltage that can be passed to @regulator_set_voltage(), 1736 * zero if this selector code can't be used on this system, or a 1737 * negative errno. 1738 */ 1739int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1740{ 1741 struct regulator_dev *rdev = regulator->rdev; 1742 struct regulator_ops *ops = rdev->desc->ops; 1743 int ret; 1744 1745 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1746 return -EINVAL; 1747 1748 mutex_lock(&rdev->mutex); 1749 ret = ops->list_voltage(rdev, selector); 1750 mutex_unlock(&rdev->mutex); 1751 1752 if (ret > 0) { 1753 if (ret < rdev->constraints->min_uV) 1754 ret = 0; 1755 else if (ret > rdev->constraints->max_uV) 1756 ret = 0; 1757 } 1758 1759 return ret; 1760} 1761EXPORT_SYMBOL_GPL(regulator_list_voltage); 1762 1763/** 1764 * regulator_is_supported_voltage - check if a voltage range can be supported 1765 * 1766 * @regulator: Regulator to check. 1767 * @min_uV: Minimum required voltage in uV. 1768 * @max_uV: Maximum required voltage in uV. 1769 * 1770 * Returns a boolean or a negative error code. 1771 */ 1772int regulator_is_supported_voltage(struct regulator *regulator, 1773 int min_uV, int max_uV) 1774{ 1775 int i, voltages, ret; 1776 1777 ret = regulator_count_voltages(regulator); 1778 if (ret < 0) 1779 return ret; 1780 voltages = ret; 1781 1782 for (i = 0; i < voltages; i++) { 1783 ret = regulator_list_voltage(regulator, i); 1784 1785 if (ret >= min_uV && ret <= max_uV) 1786 return 1; 1787 } 1788 1789 return 0; 1790} 1791EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1792 1793static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1794 int min_uV, int max_uV) 1795{ 1796 int ret; 1797 int delay = 0; 1798 unsigned int selector; 1799 1800 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1801 1802 min_uV += rdev->constraints->uV_offset; 1803 max_uV += rdev->constraints->uV_offset; 1804 1805 if (rdev->desc->ops->set_voltage) { 1806 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1807 &selector); 1808 1809 if (rdev->desc->ops->list_voltage) 1810 selector = rdev->desc->ops->list_voltage(rdev, 1811 selector); 1812 else 1813 selector = -1; 1814 } else if (rdev->desc->ops->set_voltage_sel) { 1815 int best_val = INT_MAX; 1816 int i; 1817 1818 selector = 0; 1819 1820 /* Find the smallest voltage that falls within the specified 1821 * range. 1822 */ 1823 for (i = 0; i < rdev->desc->n_voltages; i++) { 1824 ret = rdev->desc->ops->list_voltage(rdev, i); 1825 if (ret < 0) 1826 continue; 1827 1828 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1829 best_val = ret; 1830 selector = i; 1831 } 1832 } 1833 1834 /* 1835 * If we can't obtain the old selector there is not enough 1836 * info to call set_voltage_time_sel(). 1837 */ 1838 if (rdev->desc->ops->set_voltage_time_sel && 1839 rdev->desc->ops->get_voltage_sel) { 1840 unsigned int old_selector = 0; 1841 1842 ret = rdev->desc->ops->get_voltage_sel(rdev); 1843 if (ret < 0) 1844 return ret; 1845 old_selector = ret; 1846 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1847 old_selector, selector); 1848 } 1849 1850 if (best_val != INT_MAX) { 1851 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1852 selector = best_val; 1853 } else { 1854 ret = -EINVAL; 1855 } 1856 } else { 1857 ret = -EINVAL; 1858 } 1859 1860 /* Insert any necessary delays */ 1861 if (delay >= 1000) { 1862 mdelay(delay / 1000); 1863 udelay(delay % 1000); 1864 } else if (delay) { 1865 udelay(delay); 1866 } 1867 1868 if (ret == 0) 1869 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1870 NULL); 1871 1872 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1873 1874 return ret; 1875} 1876 1877/** 1878 * regulator_set_voltage - set regulator output voltage 1879 * @regulator: regulator source 1880 * @min_uV: Minimum required voltage in uV 1881 * @max_uV: Maximum acceptable voltage in uV 1882 * 1883 * Sets a voltage regulator to the desired output voltage. This can be set 1884 * during any regulator state. IOW, regulator can be disabled or enabled. 1885 * 1886 * If the regulator is enabled then the voltage will change to the new value 1887 * immediately otherwise if the regulator is disabled the regulator will 1888 * output at the new voltage when enabled. 1889 * 1890 * NOTE: If the regulator is shared between several devices then the lowest 1891 * request voltage that meets the system constraints will be used. 1892 * Regulator system constraints must be set for this regulator before 1893 * calling this function otherwise this call will fail. 1894 */ 1895int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1896{ 1897 struct regulator_dev *rdev = regulator->rdev; 1898 int ret = 0; 1899 1900 mutex_lock(&rdev->mutex); 1901 1902 /* If we're setting the same range as last time the change 1903 * should be a noop (some cpufreq implementations use the same 1904 * voltage for multiple frequencies, for example). 1905 */ 1906 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1907 goto out; 1908 1909 /* sanity check */ 1910 if (!rdev->desc->ops->set_voltage && 1911 !rdev->desc->ops->set_voltage_sel) { 1912 ret = -EINVAL; 1913 goto out; 1914 } 1915 1916 /* constraints check */ 1917 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1918 if (ret < 0) 1919 goto out; 1920 regulator->min_uV = min_uV; 1921 regulator->max_uV = max_uV; 1922 1923 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1924 if (ret < 0) 1925 goto out; 1926 1927 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1928 1929out: 1930 mutex_unlock(&rdev->mutex); 1931 return ret; 1932} 1933EXPORT_SYMBOL_GPL(regulator_set_voltage); 1934 1935/** 1936 * regulator_set_voltage_time - get raise/fall time 1937 * @regulator: regulator source 1938 * @old_uV: starting voltage in microvolts 1939 * @new_uV: target voltage in microvolts 1940 * 1941 * Provided with the starting and ending voltage, this function attempts to 1942 * calculate the time in microseconds required to rise or fall to this new 1943 * voltage. 1944 */ 1945int regulator_set_voltage_time(struct regulator *regulator, 1946 int old_uV, int new_uV) 1947{ 1948 struct regulator_dev *rdev = regulator->rdev; 1949 struct regulator_ops *ops = rdev->desc->ops; 1950 int old_sel = -1; 1951 int new_sel = -1; 1952 int voltage; 1953 int i; 1954 1955 /* Currently requires operations to do this */ 1956 if (!ops->list_voltage || !ops->set_voltage_time_sel 1957 || !rdev->desc->n_voltages) 1958 return -EINVAL; 1959 1960 for (i = 0; i < rdev->desc->n_voltages; i++) { 1961 /* We only look for exact voltage matches here */ 1962 voltage = regulator_list_voltage(regulator, i); 1963 if (voltage < 0) 1964 return -EINVAL; 1965 if (voltage == 0) 1966 continue; 1967 if (voltage == old_uV) 1968 old_sel = i; 1969 if (voltage == new_uV) 1970 new_sel = i; 1971 } 1972 1973 if (old_sel < 0 || new_sel < 0) 1974 return -EINVAL; 1975 1976 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 1977} 1978EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 1979 1980/** 1981 * regulator_sync_voltage - re-apply last regulator output voltage 1982 * @regulator: regulator source 1983 * 1984 * Re-apply the last configured voltage. This is intended to be used 1985 * where some external control source the consumer is cooperating with 1986 * has caused the configured voltage to change. 1987 */ 1988int regulator_sync_voltage(struct regulator *regulator) 1989{ 1990 struct regulator_dev *rdev = regulator->rdev; 1991 int ret, min_uV, max_uV; 1992 1993 mutex_lock(&rdev->mutex); 1994 1995 if (!rdev->desc->ops->set_voltage && 1996 !rdev->desc->ops->set_voltage_sel) { 1997 ret = -EINVAL; 1998 goto out; 1999 } 2000 2001 /* This is only going to work if we've had a voltage configured. */ 2002 if (!regulator->min_uV && !regulator->max_uV) { 2003 ret = -EINVAL; 2004 goto out; 2005 } 2006 2007 min_uV = regulator->min_uV; 2008 max_uV = regulator->max_uV; 2009 2010 /* This should be a paranoia check... */ 2011 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2012 if (ret < 0) 2013 goto out; 2014 2015 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2016 if (ret < 0) 2017 goto out; 2018 2019 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2020 2021out: 2022 mutex_unlock(&rdev->mutex); 2023 return ret; 2024} 2025EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2026 2027static int _regulator_get_voltage(struct regulator_dev *rdev) 2028{ 2029 int sel, ret; 2030 2031 if (rdev->desc->ops->get_voltage_sel) { 2032 sel = rdev->desc->ops->get_voltage_sel(rdev); 2033 if (sel < 0) 2034 return sel; 2035 ret = rdev->desc->ops->list_voltage(rdev, sel); 2036 } else if (rdev->desc->ops->get_voltage) { 2037 ret = rdev->desc->ops->get_voltage(rdev); 2038 } else { 2039 return -EINVAL; 2040 } 2041 2042 if (ret < 0) 2043 return ret; 2044 return ret - rdev->constraints->uV_offset; 2045} 2046 2047/** 2048 * regulator_get_voltage - get regulator output voltage 2049 * @regulator: regulator source 2050 * 2051 * This returns the current regulator voltage in uV. 2052 * 2053 * NOTE: If the regulator is disabled it will return the voltage value. This 2054 * function should not be used to determine regulator state. 2055 */ 2056int regulator_get_voltage(struct regulator *regulator) 2057{ 2058 int ret; 2059 2060 mutex_lock(®ulator->rdev->mutex); 2061 2062 ret = _regulator_get_voltage(regulator->rdev); 2063 2064 mutex_unlock(®ulator->rdev->mutex); 2065 2066 return ret; 2067} 2068EXPORT_SYMBOL_GPL(regulator_get_voltage); 2069 2070/** 2071 * regulator_set_current_limit - set regulator output current limit 2072 * @regulator: regulator source 2073 * @min_uA: Minimuum supported current in uA 2074 * @max_uA: Maximum supported current in uA 2075 * 2076 * Sets current sink to the desired output current. This can be set during 2077 * any regulator state. IOW, regulator can be disabled or enabled. 2078 * 2079 * If the regulator is enabled then the current will change to the new value 2080 * immediately otherwise if the regulator is disabled the regulator will 2081 * output at the new current when enabled. 2082 * 2083 * NOTE: Regulator system constraints must be set for this regulator before 2084 * calling this function otherwise this call will fail. 2085 */ 2086int regulator_set_current_limit(struct regulator *regulator, 2087 int min_uA, int max_uA) 2088{ 2089 struct regulator_dev *rdev = regulator->rdev; 2090 int ret; 2091 2092 mutex_lock(&rdev->mutex); 2093 2094 /* sanity check */ 2095 if (!rdev->desc->ops->set_current_limit) { 2096 ret = -EINVAL; 2097 goto out; 2098 } 2099 2100 /* constraints check */ 2101 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2102 if (ret < 0) 2103 goto out; 2104 2105 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2106out: 2107 mutex_unlock(&rdev->mutex); 2108 return ret; 2109} 2110EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2111 2112static int _regulator_get_current_limit(struct regulator_dev *rdev) 2113{ 2114 int ret; 2115 2116 mutex_lock(&rdev->mutex); 2117 2118 /* sanity check */ 2119 if (!rdev->desc->ops->get_current_limit) { 2120 ret = -EINVAL; 2121 goto out; 2122 } 2123 2124 ret = rdev->desc->ops->get_current_limit(rdev); 2125out: 2126 mutex_unlock(&rdev->mutex); 2127 return ret; 2128} 2129 2130/** 2131 * regulator_get_current_limit - get regulator output current 2132 * @regulator: regulator source 2133 * 2134 * This returns the current supplied by the specified current sink in uA. 2135 * 2136 * NOTE: If the regulator is disabled it will return the current value. This 2137 * function should not be used to determine regulator state. 2138 */ 2139int regulator_get_current_limit(struct regulator *regulator) 2140{ 2141 return _regulator_get_current_limit(regulator->rdev); 2142} 2143EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2144 2145/** 2146 * regulator_set_mode - set regulator operating mode 2147 * @regulator: regulator source 2148 * @mode: operating mode - one of the REGULATOR_MODE constants 2149 * 2150 * Set regulator operating mode to increase regulator efficiency or improve 2151 * regulation performance. 2152 * 2153 * NOTE: Regulator system constraints must be set for this regulator before 2154 * calling this function otherwise this call will fail. 2155 */ 2156int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2157{ 2158 struct regulator_dev *rdev = regulator->rdev; 2159 int ret; 2160 int regulator_curr_mode; 2161 2162 mutex_lock(&rdev->mutex); 2163 2164 /* sanity check */ 2165 if (!rdev->desc->ops->set_mode) { 2166 ret = -EINVAL; 2167 goto out; 2168 } 2169 2170 /* return if the same mode is requested */ 2171 if (rdev->desc->ops->get_mode) { 2172 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2173 if (regulator_curr_mode == mode) { 2174 ret = 0; 2175 goto out; 2176 } 2177 } 2178 2179 /* constraints check */ 2180 ret = regulator_mode_constrain(rdev, &mode); 2181 if (ret < 0) 2182 goto out; 2183 2184 ret = rdev->desc->ops->set_mode(rdev, mode); 2185out: 2186 mutex_unlock(&rdev->mutex); 2187 return ret; 2188} 2189EXPORT_SYMBOL_GPL(regulator_set_mode); 2190 2191static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2192{ 2193 int ret; 2194 2195 mutex_lock(&rdev->mutex); 2196 2197 /* sanity check */ 2198 if (!rdev->desc->ops->get_mode) { 2199 ret = -EINVAL; 2200 goto out; 2201 } 2202 2203 ret = rdev->desc->ops->get_mode(rdev); 2204out: 2205 mutex_unlock(&rdev->mutex); 2206 return ret; 2207} 2208 2209/** 2210 * regulator_get_mode - get regulator operating mode 2211 * @regulator: regulator source 2212 * 2213 * Get the current regulator operating mode. 2214 */ 2215unsigned int regulator_get_mode(struct regulator *regulator) 2216{ 2217 return _regulator_get_mode(regulator->rdev); 2218} 2219EXPORT_SYMBOL_GPL(regulator_get_mode); 2220 2221/** 2222 * regulator_set_optimum_mode - set regulator optimum operating mode 2223 * @regulator: regulator source 2224 * @uA_load: load current 2225 * 2226 * Notifies the regulator core of a new device load. This is then used by 2227 * DRMS (if enabled by constraints) to set the most efficient regulator 2228 * operating mode for the new regulator loading. 2229 * 2230 * Consumer devices notify their supply regulator of the maximum power 2231 * they will require (can be taken from device datasheet in the power 2232 * consumption tables) when they change operational status and hence power 2233 * state. Examples of operational state changes that can affect power 2234 * consumption are :- 2235 * 2236 * o Device is opened / closed. 2237 * o Device I/O is about to begin or has just finished. 2238 * o Device is idling in between work. 2239 * 2240 * This information is also exported via sysfs to userspace. 2241 * 2242 * DRMS will sum the total requested load on the regulator and change 2243 * to the most efficient operating mode if platform constraints allow. 2244 * 2245 * Returns the new regulator mode or error. 2246 */ 2247int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2248{ 2249 struct regulator_dev *rdev = regulator->rdev; 2250 struct regulator *consumer; 2251 int ret, output_uV, input_uV, total_uA_load = 0; 2252 unsigned int mode; 2253 2254 mutex_lock(&rdev->mutex); 2255 2256 /* 2257 * first check to see if we can set modes at all, otherwise just 2258 * tell the consumer everything is OK. 2259 */ 2260 regulator->uA_load = uA_load; 2261 ret = regulator_check_drms(rdev); 2262 if (ret < 0) { 2263 ret = 0; 2264 goto out; 2265 } 2266 2267 if (!rdev->desc->ops->get_optimum_mode) 2268 goto out; 2269 2270 /* 2271 * we can actually do this so any errors are indicators of 2272 * potential real failure. 2273 */ 2274 ret = -EINVAL; 2275 2276 /* get output voltage */ 2277 output_uV = _regulator_get_voltage(rdev); 2278 if (output_uV <= 0) { 2279 rdev_err(rdev, "invalid output voltage found\n"); 2280 goto out; 2281 } 2282 2283 /* get input voltage */ 2284 input_uV = 0; 2285 if (rdev->supply) 2286 input_uV = regulator_get_voltage(rdev->supply); 2287 if (input_uV <= 0) 2288 input_uV = rdev->constraints->input_uV; 2289 if (input_uV <= 0) { 2290 rdev_err(rdev, "invalid input voltage found\n"); 2291 goto out; 2292 } 2293 2294 /* calc total requested load for this regulator */ 2295 list_for_each_entry(consumer, &rdev->consumer_list, list) 2296 total_uA_load += consumer->uA_load; 2297 2298 mode = rdev->desc->ops->get_optimum_mode(rdev, 2299 input_uV, output_uV, 2300 total_uA_load); 2301 ret = regulator_mode_constrain(rdev, &mode); 2302 if (ret < 0) { 2303 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2304 total_uA_load, input_uV, output_uV); 2305 goto out; 2306 } 2307 2308 ret = rdev->desc->ops->set_mode(rdev, mode); 2309 if (ret < 0) { 2310 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2311 goto out; 2312 } 2313 ret = mode; 2314out: 2315 mutex_unlock(&rdev->mutex); 2316 return ret; 2317} 2318EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2319 2320/** 2321 * regulator_register_notifier - register regulator event notifier 2322 * @regulator: regulator source 2323 * @nb: notifier block 2324 * 2325 * Register notifier block to receive regulator events. 2326 */ 2327int regulator_register_notifier(struct regulator *regulator, 2328 struct notifier_block *nb) 2329{ 2330 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2331 nb); 2332} 2333EXPORT_SYMBOL_GPL(regulator_register_notifier); 2334 2335/** 2336 * regulator_unregister_notifier - unregister regulator event notifier 2337 * @regulator: regulator source 2338 * @nb: notifier block 2339 * 2340 * Unregister regulator event notifier block. 2341 */ 2342int regulator_unregister_notifier(struct regulator *regulator, 2343 struct notifier_block *nb) 2344{ 2345 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2346 nb); 2347} 2348EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2349 2350/* notify regulator consumers and downstream regulator consumers. 2351 * Note mutex must be held by caller. 2352 */ 2353static void _notifier_call_chain(struct regulator_dev *rdev, 2354 unsigned long event, void *data) 2355{ 2356 /* call rdev chain first */ 2357 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2358} 2359 2360/** 2361 * regulator_bulk_get - get multiple regulator consumers 2362 * 2363 * @dev: Device to supply 2364 * @num_consumers: Number of consumers to register 2365 * @consumers: Configuration of consumers; clients are stored here. 2366 * 2367 * @return 0 on success, an errno on failure. 2368 * 2369 * This helper function allows drivers to get several regulator 2370 * consumers in one operation. If any of the regulators cannot be 2371 * acquired then any regulators that were allocated will be freed 2372 * before returning to the caller. 2373 */ 2374int regulator_bulk_get(struct device *dev, int num_consumers, 2375 struct regulator_bulk_data *consumers) 2376{ 2377 int i; 2378 int ret; 2379 2380 for (i = 0; i < num_consumers; i++) 2381 consumers[i].consumer = NULL; 2382 2383 for (i = 0; i < num_consumers; i++) { 2384 consumers[i].consumer = regulator_get(dev, 2385 consumers[i].supply); 2386 if (IS_ERR(consumers[i].consumer)) { 2387 ret = PTR_ERR(consumers[i].consumer); 2388 dev_err(dev, "Failed to get supply '%s': %d\n", 2389 consumers[i].supply, ret); 2390 consumers[i].consumer = NULL; 2391 goto err; 2392 } 2393 } 2394 2395 return 0; 2396 2397err: 2398 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2399 regulator_put(consumers[i].consumer); 2400 2401 return ret; 2402} 2403EXPORT_SYMBOL_GPL(regulator_bulk_get); 2404 2405static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2406{ 2407 struct regulator_bulk_data *bulk = data; 2408 2409 bulk->ret = regulator_enable(bulk->consumer); 2410} 2411 2412/** 2413 * regulator_bulk_enable - enable multiple regulator consumers 2414 * 2415 * @num_consumers: Number of consumers 2416 * @consumers: Consumer data; clients are stored here. 2417 * @return 0 on success, an errno on failure 2418 * 2419 * This convenience API allows consumers to enable multiple regulator 2420 * clients in a single API call. If any consumers cannot be enabled 2421 * then any others that were enabled will be disabled again prior to 2422 * return. 2423 */ 2424int regulator_bulk_enable(int num_consumers, 2425 struct regulator_bulk_data *consumers) 2426{ 2427 LIST_HEAD(async_domain); 2428 int i; 2429 int ret = 0; 2430 2431 for (i = 0; i < num_consumers; i++) 2432 async_schedule_domain(regulator_bulk_enable_async, 2433 &consumers[i], &async_domain); 2434 2435 async_synchronize_full_domain(&async_domain); 2436 2437 /* If any consumer failed we need to unwind any that succeeded */ 2438 for (i = 0; i < num_consumers; i++) { 2439 if (consumers[i].ret != 0) { 2440 ret = consumers[i].ret; 2441 goto err; 2442 } 2443 } 2444 2445 return 0; 2446 2447err: 2448 for (i = 0; i < num_consumers; i++) 2449 if (consumers[i].ret == 0) 2450 regulator_disable(consumers[i].consumer); 2451 else 2452 pr_err("Failed to enable %s: %d\n", 2453 consumers[i].supply, consumers[i].ret); 2454 2455 return ret; 2456} 2457EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2458 2459/** 2460 * regulator_bulk_disable - disable multiple regulator consumers 2461 * 2462 * @num_consumers: Number of consumers 2463 * @consumers: Consumer data; clients are stored here. 2464 * @return 0 on success, an errno on failure 2465 * 2466 * This convenience API allows consumers to disable multiple regulator 2467 * clients in a single API call. If any consumers cannot be enabled 2468 * then any others that were disabled will be disabled again prior to 2469 * return. 2470 */ 2471int regulator_bulk_disable(int num_consumers, 2472 struct regulator_bulk_data *consumers) 2473{ 2474 int i; 2475 int ret; 2476 2477 for (i = 0; i < num_consumers; i++) { 2478 ret = regulator_disable(consumers[i].consumer); 2479 if (ret != 0) 2480 goto err; 2481 } 2482 2483 return 0; 2484 2485err: 2486 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2487 for (--i; i >= 0; --i) 2488 regulator_enable(consumers[i].consumer); 2489 2490 return ret; 2491} 2492EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2493 2494/** 2495 * regulator_bulk_free - free multiple regulator consumers 2496 * 2497 * @num_consumers: Number of consumers 2498 * @consumers: Consumer data; clients are stored here. 2499 * 2500 * This convenience API allows consumers to free multiple regulator 2501 * clients in a single API call. 2502 */ 2503void regulator_bulk_free(int num_consumers, 2504 struct regulator_bulk_data *consumers) 2505{ 2506 int i; 2507 2508 for (i = 0; i < num_consumers; i++) { 2509 regulator_put(consumers[i].consumer); 2510 consumers[i].consumer = NULL; 2511 } 2512} 2513EXPORT_SYMBOL_GPL(regulator_bulk_free); 2514 2515/** 2516 * regulator_notifier_call_chain - call regulator event notifier 2517 * @rdev: regulator source 2518 * @event: notifier block 2519 * @data: callback-specific data. 2520 * 2521 * Called by regulator drivers to notify clients a regulator event has 2522 * occurred. We also notify regulator clients downstream. 2523 * Note lock must be held by caller. 2524 */ 2525int regulator_notifier_call_chain(struct regulator_dev *rdev, 2526 unsigned long event, void *data) 2527{ 2528 _notifier_call_chain(rdev, event, data); 2529 return NOTIFY_DONE; 2530 2531} 2532EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2533 2534/** 2535 * regulator_mode_to_status - convert a regulator mode into a status 2536 * 2537 * @mode: Mode to convert 2538 * 2539 * Convert a regulator mode into a status. 2540 */ 2541int regulator_mode_to_status(unsigned int mode) 2542{ 2543 switch (mode) { 2544 case REGULATOR_MODE_FAST: 2545 return REGULATOR_STATUS_FAST; 2546 case REGULATOR_MODE_NORMAL: 2547 return REGULATOR_STATUS_NORMAL; 2548 case REGULATOR_MODE_IDLE: 2549 return REGULATOR_STATUS_IDLE; 2550 case REGULATOR_STATUS_STANDBY: 2551 return REGULATOR_STATUS_STANDBY; 2552 default: 2553 return 0; 2554 } 2555} 2556EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2557 2558/* 2559 * To avoid cluttering sysfs (and memory) with useless state, only 2560 * create attributes that can be meaningfully displayed. 2561 */ 2562static int add_regulator_attributes(struct regulator_dev *rdev) 2563{ 2564 struct device *dev = &rdev->dev; 2565 struct regulator_ops *ops = rdev->desc->ops; 2566 int status = 0; 2567 2568 /* some attributes need specific methods to be displayed */ 2569 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2570 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2571 status = device_create_file(dev, &dev_attr_microvolts); 2572 if (status < 0) 2573 return status; 2574 } 2575 if (ops->get_current_limit) { 2576 status = device_create_file(dev, &dev_attr_microamps); 2577 if (status < 0) 2578 return status; 2579 } 2580 if (ops->get_mode) { 2581 status = device_create_file(dev, &dev_attr_opmode); 2582 if (status < 0) 2583 return status; 2584 } 2585 if (ops->is_enabled) { 2586 status = device_create_file(dev, &dev_attr_state); 2587 if (status < 0) 2588 return status; 2589 } 2590 if (ops->get_status) { 2591 status = device_create_file(dev, &dev_attr_status); 2592 if (status < 0) 2593 return status; 2594 } 2595 2596 /* some attributes are type-specific */ 2597 if (rdev->desc->type == REGULATOR_CURRENT) { 2598 status = device_create_file(dev, &dev_attr_requested_microamps); 2599 if (status < 0) 2600 return status; 2601 } 2602 2603 /* all the other attributes exist to support constraints; 2604 * don't show them if there are no constraints, or if the 2605 * relevant supporting methods are missing. 2606 */ 2607 if (!rdev->constraints) 2608 return status; 2609 2610 /* constraints need specific supporting methods */ 2611 if (ops->set_voltage || ops->set_voltage_sel) { 2612 status = device_create_file(dev, &dev_attr_min_microvolts); 2613 if (status < 0) 2614 return status; 2615 status = device_create_file(dev, &dev_attr_max_microvolts); 2616 if (status < 0) 2617 return status; 2618 } 2619 if (ops->set_current_limit) { 2620 status = device_create_file(dev, &dev_attr_min_microamps); 2621 if (status < 0) 2622 return status; 2623 status = device_create_file(dev, &dev_attr_max_microamps); 2624 if (status < 0) 2625 return status; 2626 } 2627 2628 /* suspend mode constraints need multiple supporting methods */ 2629 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2630 return status; 2631 2632 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2633 if (status < 0) 2634 return status; 2635 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2636 if (status < 0) 2637 return status; 2638 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2639 if (status < 0) 2640 return status; 2641 2642 if (ops->set_suspend_voltage) { 2643 status = device_create_file(dev, 2644 &dev_attr_suspend_standby_microvolts); 2645 if (status < 0) 2646 return status; 2647 status = device_create_file(dev, 2648 &dev_attr_suspend_mem_microvolts); 2649 if (status < 0) 2650 return status; 2651 status = device_create_file(dev, 2652 &dev_attr_suspend_disk_microvolts); 2653 if (status < 0) 2654 return status; 2655 } 2656 2657 if (ops->set_suspend_mode) { 2658 status = device_create_file(dev, 2659 &dev_attr_suspend_standby_mode); 2660 if (status < 0) 2661 return status; 2662 status = device_create_file(dev, 2663 &dev_attr_suspend_mem_mode); 2664 if (status < 0) 2665 return status; 2666 status = device_create_file(dev, 2667 &dev_attr_suspend_disk_mode); 2668 if (status < 0) 2669 return status; 2670 } 2671 2672 return status; 2673} 2674 2675static void rdev_init_debugfs(struct regulator_dev *rdev) 2676{ 2677#ifdef CONFIG_DEBUG_FS 2678 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2679 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2680 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2681 rdev->debugfs = NULL; 2682 return; 2683 } 2684 2685 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2686 &rdev->use_count); 2687 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2688 &rdev->open_count); 2689#endif 2690} 2691 2692/** 2693 * regulator_register - register regulator 2694 * @regulator_desc: regulator to register 2695 * @dev: struct device for the regulator 2696 * @init_data: platform provided init data, passed through by driver 2697 * @driver_data: private regulator data 2698 * 2699 * Called by regulator drivers to register a regulator. 2700 * Returns 0 on success. 2701 */ 2702struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2703 struct device *dev, const struct regulator_init_data *init_data, 2704 void *driver_data, struct device_node *of_node) 2705{ 2706 const struct regulation_constraints *constraints = NULL; 2707 static atomic_t regulator_no = ATOMIC_INIT(0); 2708 struct regulator_dev *rdev; 2709 int ret, i; 2710 const char *supply = NULL; 2711 2712 if (regulator_desc == NULL) 2713 return ERR_PTR(-EINVAL); 2714 2715 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2716 return ERR_PTR(-EINVAL); 2717 2718 if (regulator_desc->type != REGULATOR_VOLTAGE && 2719 regulator_desc->type != REGULATOR_CURRENT) 2720 return ERR_PTR(-EINVAL); 2721 2722 /* Only one of each should be implemented */ 2723 WARN_ON(regulator_desc->ops->get_voltage && 2724 regulator_desc->ops->get_voltage_sel); 2725 WARN_ON(regulator_desc->ops->set_voltage && 2726 regulator_desc->ops->set_voltage_sel); 2727 2728 /* If we're using selectors we must implement list_voltage. */ 2729 if (regulator_desc->ops->get_voltage_sel && 2730 !regulator_desc->ops->list_voltage) { 2731 return ERR_PTR(-EINVAL); 2732 } 2733 if (regulator_desc->ops->set_voltage_sel && 2734 !regulator_desc->ops->list_voltage) { 2735 return ERR_PTR(-EINVAL); 2736 } 2737 2738 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2739 if (rdev == NULL) 2740 return ERR_PTR(-ENOMEM); 2741 2742 mutex_lock(®ulator_list_mutex); 2743 2744 mutex_init(&rdev->mutex); 2745 rdev->reg_data = driver_data; 2746 rdev->owner = regulator_desc->owner; 2747 rdev->desc = regulator_desc; 2748 INIT_LIST_HEAD(&rdev->consumer_list); 2749 INIT_LIST_HEAD(&rdev->list); 2750 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2751 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2752 2753 /* preform any regulator specific init */ 2754 if (init_data && init_data->regulator_init) { 2755 ret = init_data->regulator_init(rdev->reg_data); 2756 if (ret < 0) 2757 goto clean; 2758 } 2759 2760 /* register with sysfs */ 2761 rdev->dev.class = ®ulator_class; 2762 rdev->dev.of_node = of_node; 2763 rdev->dev.parent = dev; 2764 dev_set_name(&rdev->dev, "regulator.%d", 2765 atomic_inc_return(®ulator_no) - 1); 2766 ret = device_register(&rdev->dev); 2767 if (ret != 0) { 2768 put_device(&rdev->dev); 2769 goto clean; 2770 } 2771 2772 dev_set_drvdata(&rdev->dev, rdev); 2773 2774 /* set regulator constraints */ 2775 if (init_data) 2776 constraints = &init_data->constraints; 2777 2778 ret = set_machine_constraints(rdev, constraints); 2779 if (ret < 0) 2780 goto scrub; 2781 2782 /* add attributes supported by this regulator */ 2783 ret = add_regulator_attributes(rdev); 2784 if (ret < 0) 2785 goto scrub; 2786 2787 if (init_data && init_data->supply_regulator) 2788 supply = init_data->supply_regulator; 2789 else if (regulator_desc->supply_name) 2790 supply = regulator_desc->supply_name; 2791 2792 if (supply) { 2793 struct regulator_dev *r; 2794 2795 r = regulator_dev_lookup(dev, supply); 2796 2797 if (!r) { 2798 dev_err(dev, "Failed to find supply %s\n", supply); 2799 ret = -ENODEV; 2800 goto scrub; 2801 } 2802 2803 ret = set_supply(rdev, r); 2804 if (ret < 0) 2805 goto scrub; 2806 } 2807 2808 /* add consumers devices */ 2809 if (init_data) { 2810 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2811 ret = set_consumer_device_supply(rdev, 2812 init_data->consumer_supplies[i].dev, 2813 init_data->consumer_supplies[i].dev_name, 2814 init_data->consumer_supplies[i].supply); 2815 if (ret < 0) { 2816 dev_err(dev, "Failed to set supply %s\n", 2817 init_data->consumer_supplies[i].supply); 2818 goto unset_supplies; 2819 } 2820 } 2821 } 2822 2823 list_add(&rdev->list, ®ulator_list); 2824 2825 rdev_init_debugfs(rdev); 2826out: 2827 mutex_unlock(®ulator_list_mutex); 2828 return rdev; 2829 2830unset_supplies: 2831 unset_regulator_supplies(rdev); 2832 2833scrub: 2834 kfree(rdev->constraints); 2835 device_unregister(&rdev->dev); 2836 /* device core frees rdev */ 2837 rdev = ERR_PTR(ret); 2838 goto out; 2839 2840clean: 2841 kfree(rdev); 2842 rdev = ERR_PTR(ret); 2843 goto out; 2844} 2845EXPORT_SYMBOL_GPL(regulator_register); 2846 2847/** 2848 * regulator_unregister - unregister regulator 2849 * @rdev: regulator to unregister 2850 * 2851 * Called by regulator drivers to unregister a regulator. 2852 */ 2853void regulator_unregister(struct regulator_dev *rdev) 2854{ 2855 if (rdev == NULL) 2856 return; 2857 2858 mutex_lock(®ulator_list_mutex); 2859#ifdef CONFIG_DEBUG_FS 2860 debugfs_remove_recursive(rdev->debugfs); 2861#endif 2862 flush_work_sync(&rdev->disable_work.work); 2863 WARN_ON(rdev->open_count); 2864 unset_regulator_supplies(rdev); 2865 list_del(&rdev->list); 2866 if (rdev->supply) 2867 regulator_put(rdev->supply); 2868 kfree(rdev->constraints); 2869 device_unregister(&rdev->dev); 2870 mutex_unlock(®ulator_list_mutex); 2871} 2872EXPORT_SYMBOL_GPL(regulator_unregister); 2873 2874/** 2875 * regulator_suspend_prepare - prepare regulators for system wide suspend 2876 * @state: system suspend state 2877 * 2878 * Configure each regulator with it's suspend operating parameters for state. 2879 * This will usually be called by machine suspend code prior to supending. 2880 */ 2881int regulator_suspend_prepare(suspend_state_t state) 2882{ 2883 struct regulator_dev *rdev; 2884 int ret = 0; 2885 2886 /* ON is handled by regulator active state */ 2887 if (state == PM_SUSPEND_ON) 2888 return -EINVAL; 2889 2890 mutex_lock(®ulator_list_mutex); 2891 list_for_each_entry(rdev, ®ulator_list, list) { 2892 2893 mutex_lock(&rdev->mutex); 2894 ret = suspend_prepare(rdev, state); 2895 mutex_unlock(&rdev->mutex); 2896 2897 if (ret < 0) { 2898 rdev_err(rdev, "failed to prepare\n"); 2899 goto out; 2900 } 2901 } 2902out: 2903 mutex_unlock(®ulator_list_mutex); 2904 return ret; 2905} 2906EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2907 2908/** 2909 * regulator_suspend_finish - resume regulators from system wide suspend 2910 * 2911 * Turn on regulators that might be turned off by regulator_suspend_prepare 2912 * and that should be turned on according to the regulators properties. 2913 */ 2914int regulator_suspend_finish(void) 2915{ 2916 struct regulator_dev *rdev; 2917 int ret = 0, error; 2918 2919 mutex_lock(®ulator_list_mutex); 2920 list_for_each_entry(rdev, ®ulator_list, list) { 2921 struct regulator_ops *ops = rdev->desc->ops; 2922 2923 mutex_lock(&rdev->mutex); 2924 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 2925 ops->enable) { 2926 error = ops->enable(rdev); 2927 if (error) 2928 ret = error; 2929 } else { 2930 if (!has_full_constraints) 2931 goto unlock; 2932 if (!ops->disable) 2933 goto unlock; 2934 if (ops->is_enabled && !ops->is_enabled(rdev)) 2935 goto unlock; 2936 2937 error = ops->disable(rdev); 2938 if (error) 2939 ret = error; 2940 } 2941unlock: 2942 mutex_unlock(&rdev->mutex); 2943 } 2944 mutex_unlock(®ulator_list_mutex); 2945 return ret; 2946} 2947EXPORT_SYMBOL_GPL(regulator_suspend_finish); 2948 2949/** 2950 * regulator_has_full_constraints - the system has fully specified constraints 2951 * 2952 * Calling this function will cause the regulator API to disable all 2953 * regulators which have a zero use count and don't have an always_on 2954 * constraint in a late_initcall. 2955 * 2956 * The intention is that this will become the default behaviour in a 2957 * future kernel release so users are encouraged to use this facility 2958 * now. 2959 */ 2960void regulator_has_full_constraints(void) 2961{ 2962 has_full_constraints = 1; 2963} 2964EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2965 2966/** 2967 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2968 * 2969 * Calling this function will cause the regulator API to provide a 2970 * dummy regulator to consumers if no physical regulator is found, 2971 * allowing most consumers to proceed as though a regulator were 2972 * configured. This allows systems such as those with software 2973 * controllable regulators for the CPU core only to be brought up more 2974 * readily. 2975 */ 2976void regulator_use_dummy_regulator(void) 2977{ 2978 board_wants_dummy_regulator = true; 2979} 2980EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2981 2982/** 2983 * rdev_get_drvdata - get rdev regulator driver data 2984 * @rdev: regulator 2985 * 2986 * Get rdev regulator driver private data. This call can be used in the 2987 * regulator driver context. 2988 */ 2989void *rdev_get_drvdata(struct regulator_dev *rdev) 2990{ 2991 return rdev->reg_data; 2992} 2993EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2994 2995/** 2996 * regulator_get_drvdata - get regulator driver data 2997 * @regulator: regulator 2998 * 2999 * Get regulator driver private data. This call can be used in the consumer 3000 * driver context when non API regulator specific functions need to be called. 3001 */ 3002void *regulator_get_drvdata(struct regulator *regulator) 3003{ 3004 return regulator->rdev->reg_data; 3005} 3006EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3007 3008/** 3009 * regulator_set_drvdata - set regulator driver data 3010 * @regulator: regulator 3011 * @data: data 3012 */ 3013void regulator_set_drvdata(struct regulator *regulator, void *data) 3014{ 3015 regulator->rdev->reg_data = data; 3016} 3017EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3018 3019/** 3020 * regulator_get_id - get regulator ID 3021 * @rdev: regulator 3022 */ 3023int rdev_get_id(struct regulator_dev *rdev) 3024{ 3025 return rdev->desc->id; 3026} 3027EXPORT_SYMBOL_GPL(rdev_get_id); 3028 3029struct device *rdev_get_dev(struct regulator_dev *rdev) 3030{ 3031 return &rdev->dev; 3032} 3033EXPORT_SYMBOL_GPL(rdev_get_dev); 3034 3035void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3036{ 3037 return reg_init_data->driver_data; 3038} 3039EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3040 3041#ifdef CONFIG_DEBUG_FS 3042static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3043 size_t count, loff_t *ppos) 3044{ 3045 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3046 ssize_t len, ret = 0; 3047 struct regulator_map *map; 3048 3049 if (!buf) 3050 return -ENOMEM; 3051 3052 list_for_each_entry(map, ®ulator_map_list, list) { 3053 len = snprintf(buf + ret, PAGE_SIZE - ret, 3054 "%s -> %s.%s\n", 3055 rdev_get_name(map->regulator), map->dev_name, 3056 map->supply); 3057 if (len >= 0) 3058 ret += len; 3059 if (ret > PAGE_SIZE) { 3060 ret = PAGE_SIZE; 3061 break; 3062 } 3063 } 3064 3065 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3066 3067 kfree(buf); 3068 3069 return ret; 3070} 3071 3072static const struct file_operations supply_map_fops = { 3073 .read = supply_map_read_file, 3074 .llseek = default_llseek, 3075}; 3076#endif 3077 3078static int __init regulator_init(void) 3079{ 3080 int ret; 3081 3082 ret = class_register(®ulator_class); 3083 3084#ifdef CONFIG_DEBUG_FS 3085 debugfs_root = debugfs_create_dir("regulator", NULL); 3086 if (IS_ERR(debugfs_root) || !debugfs_root) { 3087 pr_warn("regulator: Failed to create debugfs directory\n"); 3088 debugfs_root = NULL; 3089 } 3090 3091 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3092 NULL, &supply_map_fops))) 3093 pr_warn("regulator: Failed to create supplies debugfs\n"); 3094#endif 3095 3096 regulator_dummy_init(); 3097 3098 return ret; 3099} 3100 3101/* init early to allow our consumers to complete system booting */ 3102core_initcall(regulator_init); 3103 3104static int __init regulator_init_complete(void) 3105{ 3106 struct regulator_dev *rdev; 3107 struct regulator_ops *ops; 3108 struct regulation_constraints *c; 3109 int enabled, ret; 3110 3111 mutex_lock(®ulator_list_mutex); 3112 3113 /* If we have a full configuration then disable any regulators 3114 * which are not in use or always_on. This will become the 3115 * default behaviour in the future. 3116 */ 3117 list_for_each_entry(rdev, ®ulator_list, list) { 3118 ops = rdev->desc->ops; 3119 c = rdev->constraints; 3120 3121 if (!ops->disable || (c && c->always_on)) 3122 continue; 3123 3124 mutex_lock(&rdev->mutex); 3125 3126 if (rdev->use_count) 3127 goto unlock; 3128 3129 /* If we can't read the status assume it's on. */ 3130 if (ops->is_enabled) 3131 enabled = ops->is_enabled(rdev); 3132 else 3133 enabled = 1; 3134 3135 if (!enabled) 3136 goto unlock; 3137 3138 if (has_full_constraints) { 3139 /* We log since this may kill the system if it 3140 * goes wrong. */ 3141 rdev_info(rdev, "disabling\n"); 3142 ret = ops->disable(rdev); 3143 if (ret != 0) { 3144 rdev_err(rdev, "couldn't disable: %d\n", ret); 3145 } 3146 } else { 3147 /* The intention is that in future we will 3148 * assume that full constraints are provided 3149 * so warn even if we aren't going to do 3150 * anything here. 3151 */ 3152 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3153 } 3154 3155unlock: 3156 mutex_unlock(&rdev->mutex); 3157 } 3158 3159 mutex_unlock(®ulator_list_mutex); 3160 3161 return 0; 3162} 3163late_initcall(regulator_init_complete); 3164