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 (rdev->supply == NULL) { 989 err = -ENOMEM; 990 return err; 991 } 992 993 return 0; 994} 995 996/** 997 * set_consumer_device_supply - Bind a regulator to a symbolic supply 998 * @rdev: regulator source 999 * @consumer_dev: device the supply applies to 1000 * @consumer_dev_name: dev_name() string for device supply applies to 1001 * @supply: symbolic name for supply 1002 * 1003 * Allows platform initialisation code to map physical regulator 1004 * sources to symbolic names for supplies for use by devices. Devices 1005 * should use these symbolic names to request regulators, avoiding the 1006 * need to provide board-specific regulator names as platform data. 1007 * 1008 * Only one of consumer_dev and consumer_dev_name may be specified. 1009 */ 1010static int set_consumer_device_supply(struct regulator_dev *rdev, 1011 struct device *consumer_dev, const char *consumer_dev_name, 1012 const char *supply) 1013{ 1014 struct regulator_map *node; 1015 int has_dev; 1016 1017 if (consumer_dev && consumer_dev_name) 1018 return -EINVAL; 1019 1020 if (!consumer_dev_name && consumer_dev) 1021 consumer_dev_name = dev_name(consumer_dev); 1022 1023 if (supply == NULL) 1024 return -EINVAL; 1025 1026 if (consumer_dev_name != NULL) 1027 has_dev = 1; 1028 else 1029 has_dev = 0; 1030 1031 list_for_each_entry(node, ®ulator_map_list, list) { 1032 if (node->dev_name && consumer_dev_name) { 1033 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1034 continue; 1035 } else if (node->dev_name || consumer_dev_name) { 1036 continue; 1037 } 1038 1039 if (strcmp(node->supply, supply) != 0) 1040 continue; 1041 1042 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 1043 dev_name(&node->regulator->dev), 1044 node->regulator->desc->name, 1045 supply, 1046 dev_name(&rdev->dev), rdev_get_name(rdev)); 1047 return -EBUSY; 1048 } 1049 1050 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1051 if (node == NULL) 1052 return -ENOMEM; 1053 1054 node->regulator = rdev; 1055 node->supply = supply; 1056 1057 if (has_dev) { 1058 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1059 if (node->dev_name == NULL) { 1060 kfree(node); 1061 return -ENOMEM; 1062 } 1063 } 1064 1065 list_add(&node->list, ®ulator_map_list); 1066 return 0; 1067} 1068 1069static void unset_regulator_supplies(struct regulator_dev *rdev) 1070{ 1071 struct regulator_map *node, *n; 1072 1073 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1074 if (rdev == node->regulator) { 1075 list_del(&node->list); 1076 kfree(node->dev_name); 1077 kfree(node); 1078 } 1079 } 1080} 1081 1082#define REG_STR_SIZE 64 1083 1084static struct regulator *create_regulator(struct regulator_dev *rdev, 1085 struct device *dev, 1086 const char *supply_name) 1087{ 1088 struct regulator *regulator; 1089 char buf[REG_STR_SIZE]; 1090 int err, size; 1091 1092 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1093 if (regulator == NULL) 1094 return NULL; 1095 1096 mutex_lock(&rdev->mutex); 1097 regulator->rdev = rdev; 1098 list_add(®ulator->list, &rdev->consumer_list); 1099 1100 if (dev) { 1101 /* create a 'requested_microamps_name' sysfs entry */ 1102 size = scnprintf(buf, REG_STR_SIZE, 1103 "microamps_requested_%s-%s", 1104 dev_name(dev), supply_name); 1105 if (size >= REG_STR_SIZE) 1106 goto overflow_err; 1107 1108 regulator->dev = dev; 1109 sysfs_attr_init(®ulator->dev_attr.attr); 1110 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1111 if (regulator->dev_attr.attr.name == NULL) 1112 goto attr_name_err; 1113 1114 regulator->dev_attr.attr.mode = 0444; 1115 regulator->dev_attr.show = device_requested_uA_show; 1116 err = device_create_file(dev, ®ulator->dev_attr); 1117 if (err < 0) { 1118 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1119 goto attr_name_err; 1120 } 1121 1122 /* also add a link to the device sysfs entry */ 1123 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1124 dev->kobj.name, supply_name); 1125 if (size >= REG_STR_SIZE) 1126 goto attr_err; 1127 1128 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1129 if (regulator->supply_name == NULL) 1130 goto attr_err; 1131 1132 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1133 buf); 1134 if (err) { 1135 rdev_warn(rdev, "could not add device link %s err %d\n", 1136 dev->kobj.name, err); 1137 goto link_name_err; 1138 } 1139 } else { 1140 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1141 if (regulator->supply_name == NULL) 1142 goto attr_err; 1143 } 1144 1145#ifdef CONFIG_DEBUG_FS 1146 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1147 rdev->debugfs); 1148 if (IS_ERR_OR_NULL(regulator->debugfs)) { 1149 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1150 regulator->debugfs = NULL; 1151 } else { 1152 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1153 ®ulator->uA_load); 1154 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1155 ®ulator->min_uV); 1156 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1157 ®ulator->max_uV); 1158 } 1159#endif 1160 1161 mutex_unlock(&rdev->mutex); 1162 return regulator; 1163link_name_err: 1164 kfree(regulator->supply_name); 1165attr_err: 1166 device_remove_file(regulator->dev, ®ulator->dev_attr); 1167attr_name_err: 1168 kfree(regulator->dev_attr.attr.name); 1169overflow_err: 1170 list_del(®ulator->list); 1171 kfree(regulator); 1172 mutex_unlock(&rdev->mutex); 1173 return NULL; 1174} 1175 1176static int _regulator_get_enable_time(struct regulator_dev *rdev) 1177{ 1178 if (!rdev->desc->ops->enable_time) 1179 return 0; 1180 return rdev->desc->ops->enable_time(rdev); 1181} 1182 1183static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1184 const char *supply) 1185{ 1186 struct regulator_dev *r; 1187 struct device_node *node; 1188 1189 /* first do a dt based lookup */ 1190 if (dev && dev->of_node) { 1191 node = of_get_regulator(dev, supply); 1192 if (node) 1193 list_for_each_entry(r, ®ulator_list, list) 1194 if (r->dev.parent && 1195 node == r->dev.of_node) 1196 return r; 1197 } 1198 1199 /* if not found, try doing it non-dt way */ 1200 list_for_each_entry(r, ®ulator_list, list) 1201 if (strcmp(rdev_get_name(r), supply) == 0) 1202 return r; 1203 1204 return NULL; 1205} 1206 1207/* Internal regulator request function */ 1208static struct regulator *_regulator_get(struct device *dev, const char *id, 1209 int exclusive) 1210{ 1211 struct regulator_dev *rdev; 1212 struct regulator_map *map; 1213 struct regulator *regulator = ERR_PTR(-ENODEV); 1214 const char *devname = NULL; 1215 int ret; 1216 1217 if (id == NULL) { 1218 pr_err("get() with no identifier\n"); 1219 return regulator; 1220 } 1221 1222 if (dev) 1223 devname = dev_name(dev); 1224 1225 mutex_lock(®ulator_list_mutex); 1226 1227 rdev = regulator_dev_lookup(dev, id); 1228 if (rdev) 1229 goto found; 1230 1231 list_for_each_entry(map, ®ulator_map_list, list) { 1232 /* If the mapping has a device set up it must match */ 1233 if (map->dev_name && 1234 (!devname || strcmp(map->dev_name, devname))) 1235 continue; 1236 1237 if (strcmp(map->supply, id) == 0) { 1238 rdev = map->regulator; 1239 goto found; 1240 } 1241 } 1242 1243 if (board_wants_dummy_regulator) { 1244 rdev = dummy_regulator_rdev; 1245 goto found; 1246 } 1247 1248#ifdef CONFIG_REGULATOR_DUMMY 1249 if (!devname) 1250 devname = "deviceless"; 1251 1252 /* If the board didn't flag that it was fully constrained then 1253 * substitute in a dummy regulator so consumers can continue. 1254 */ 1255 if (!has_full_constraints) { 1256 pr_warn("%s supply %s not found, using dummy regulator\n", 1257 devname, id); 1258 rdev = dummy_regulator_rdev; 1259 goto found; 1260 } 1261#endif 1262 1263 mutex_unlock(®ulator_list_mutex); 1264 return regulator; 1265 1266found: 1267 if (rdev->exclusive) { 1268 regulator = ERR_PTR(-EPERM); 1269 goto out; 1270 } 1271 1272 if (exclusive && rdev->open_count) { 1273 regulator = ERR_PTR(-EBUSY); 1274 goto out; 1275 } 1276 1277 if (!try_module_get(rdev->owner)) 1278 goto out; 1279 1280 regulator = create_regulator(rdev, dev, id); 1281 if (regulator == NULL) { 1282 regulator = ERR_PTR(-ENOMEM); 1283 module_put(rdev->owner); 1284 goto out; 1285 } 1286 1287 rdev->open_count++; 1288 if (exclusive) { 1289 rdev->exclusive = 1; 1290 1291 ret = _regulator_is_enabled(rdev); 1292 if (ret > 0) 1293 rdev->use_count = 1; 1294 else 1295 rdev->use_count = 0; 1296 } 1297 1298out: 1299 mutex_unlock(®ulator_list_mutex); 1300 1301 return regulator; 1302} 1303 1304/** 1305 * regulator_get - lookup and obtain a reference to a regulator. 1306 * @dev: device for regulator "consumer" 1307 * @id: Supply name or regulator ID. 1308 * 1309 * Returns a struct regulator corresponding to the regulator producer, 1310 * or IS_ERR() condition containing errno. 1311 * 1312 * Use of supply names configured via regulator_set_device_supply() is 1313 * strongly encouraged. It is recommended that the supply name used 1314 * should match the name used for the supply and/or the relevant 1315 * device pins in the datasheet. 1316 */ 1317struct regulator *regulator_get(struct device *dev, const char *id) 1318{ 1319 return _regulator_get(dev, id, 0); 1320} 1321EXPORT_SYMBOL_GPL(regulator_get); 1322 1323/** 1324 * regulator_get_exclusive - obtain exclusive access to a regulator. 1325 * @dev: device for regulator "consumer" 1326 * @id: Supply name or regulator ID. 1327 * 1328 * Returns a struct regulator corresponding to the regulator producer, 1329 * or IS_ERR() condition containing errno. Other consumers will be 1330 * unable to obtain this reference is held and the use count for the 1331 * regulator will be initialised to reflect the current state of the 1332 * regulator. 1333 * 1334 * This is intended for use by consumers which cannot tolerate shared 1335 * use of the regulator such as those which need to force the 1336 * regulator off for correct operation of the hardware they are 1337 * controlling. 1338 * 1339 * Use of supply names configured via regulator_set_device_supply() is 1340 * strongly encouraged. It is recommended that the supply name used 1341 * should match the name used for the supply and/or the relevant 1342 * device pins in the datasheet. 1343 */ 1344struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1345{ 1346 return _regulator_get(dev, id, 1); 1347} 1348EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1349 1350/** 1351 * regulator_put - "free" the regulator source 1352 * @regulator: regulator source 1353 * 1354 * Note: drivers must ensure that all regulator_enable calls made on this 1355 * regulator source are balanced by regulator_disable calls prior to calling 1356 * this function. 1357 */ 1358void regulator_put(struct regulator *regulator) 1359{ 1360 struct regulator_dev *rdev; 1361 1362 if (regulator == NULL || IS_ERR(regulator)) 1363 return; 1364 1365 mutex_lock(®ulator_list_mutex); 1366 rdev = regulator->rdev; 1367 1368#ifdef CONFIG_DEBUG_FS 1369 debugfs_remove_recursive(regulator->debugfs); 1370#endif 1371 1372 /* remove any sysfs entries */ 1373 if (regulator->dev) { 1374 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1375 device_remove_file(regulator->dev, ®ulator->dev_attr); 1376 kfree(regulator->dev_attr.attr.name); 1377 } 1378 kfree(regulator->supply_name); 1379 list_del(®ulator->list); 1380 kfree(regulator); 1381 1382 rdev->open_count--; 1383 rdev->exclusive = 0; 1384 1385 module_put(rdev->owner); 1386 mutex_unlock(®ulator_list_mutex); 1387} 1388EXPORT_SYMBOL_GPL(regulator_put); 1389 1390static int _regulator_can_change_status(struct regulator_dev *rdev) 1391{ 1392 if (!rdev->constraints) 1393 return 0; 1394 1395 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1396 return 1; 1397 else 1398 return 0; 1399} 1400 1401/* locks held by regulator_enable() */ 1402static int _regulator_enable(struct regulator_dev *rdev) 1403{ 1404 int ret, delay; 1405 1406 /* check voltage and requested load before enabling */ 1407 if (rdev->constraints && 1408 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1409 drms_uA_update(rdev); 1410 1411 if (rdev->use_count == 0) { 1412 /* The regulator may on if it's not switchable or left on */ 1413 ret = _regulator_is_enabled(rdev); 1414 if (ret == -EINVAL || ret == 0) { 1415 if (!_regulator_can_change_status(rdev)) 1416 return -EPERM; 1417 1418 if (!rdev->desc->ops->enable) 1419 return -EINVAL; 1420 1421 /* Query before enabling in case configuration 1422 * dependent. */ 1423 ret = _regulator_get_enable_time(rdev); 1424 if (ret >= 0) { 1425 delay = ret; 1426 } else { 1427 rdev_warn(rdev, "enable_time() failed: %d\n", 1428 ret); 1429 delay = 0; 1430 } 1431 1432 trace_regulator_enable(rdev_get_name(rdev)); 1433 1434 /* Allow the regulator to ramp; it would be useful 1435 * to extend this for bulk operations so that the 1436 * regulators can ramp together. */ 1437 ret = rdev->desc->ops->enable(rdev); 1438 if (ret < 0) 1439 return ret; 1440 1441 trace_regulator_enable_delay(rdev_get_name(rdev)); 1442 1443 if (delay >= 1000) { 1444 mdelay(delay / 1000); 1445 udelay(delay % 1000); 1446 } else if (delay) { 1447 udelay(delay); 1448 } 1449 1450 trace_regulator_enable_complete(rdev_get_name(rdev)); 1451 1452 } else if (ret < 0) { 1453 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1454 return ret; 1455 } 1456 /* Fallthrough on positive return values - already enabled */ 1457 } 1458 1459 rdev->use_count++; 1460 1461 return 0; 1462} 1463 1464/** 1465 * regulator_enable - enable regulator output 1466 * @regulator: regulator source 1467 * 1468 * Request that the regulator be enabled with the regulator output at 1469 * the predefined voltage or current value. Calls to regulator_enable() 1470 * must be balanced with calls to regulator_disable(). 1471 * 1472 * NOTE: the output value can be set by other drivers, boot loader or may be 1473 * hardwired in the regulator. 1474 */ 1475int regulator_enable(struct regulator *regulator) 1476{ 1477 struct regulator_dev *rdev = regulator->rdev; 1478 int ret = 0; 1479 1480 if (rdev->supply) { 1481 ret = regulator_enable(rdev->supply); 1482 if (ret != 0) 1483 return ret; 1484 } 1485 1486 mutex_lock(&rdev->mutex); 1487 ret = _regulator_enable(rdev); 1488 mutex_unlock(&rdev->mutex); 1489 1490 if (ret != 0 && rdev->supply) 1491 regulator_disable(rdev->supply); 1492 1493 return ret; 1494} 1495EXPORT_SYMBOL_GPL(regulator_enable); 1496 1497/* locks held by regulator_disable() */ 1498static int _regulator_disable(struct regulator_dev *rdev) 1499{ 1500 int ret = 0; 1501 1502 if (WARN(rdev->use_count <= 0, 1503 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1504 return -EIO; 1505 1506 /* are we the last user and permitted to disable ? */ 1507 if (rdev->use_count == 1 && 1508 (rdev->constraints && !rdev->constraints->always_on)) { 1509 1510 /* we are last user */ 1511 if (_regulator_can_change_status(rdev) && 1512 rdev->desc->ops->disable) { 1513 trace_regulator_disable(rdev_get_name(rdev)); 1514 1515 ret = rdev->desc->ops->disable(rdev); 1516 if (ret < 0) { 1517 rdev_err(rdev, "failed to disable\n"); 1518 return ret; 1519 } 1520 1521 trace_regulator_disable_complete(rdev_get_name(rdev)); 1522 1523 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1524 NULL); 1525 } 1526 1527 rdev->use_count = 0; 1528 } else if (rdev->use_count > 1) { 1529 1530 if (rdev->constraints && 1531 (rdev->constraints->valid_ops_mask & 1532 REGULATOR_CHANGE_DRMS)) 1533 drms_uA_update(rdev); 1534 1535 rdev->use_count--; 1536 } 1537 1538 return ret; 1539} 1540 1541/** 1542 * regulator_disable - disable regulator output 1543 * @regulator: regulator source 1544 * 1545 * Disable the regulator output voltage or current. Calls to 1546 * regulator_enable() must be balanced with calls to 1547 * regulator_disable(). 1548 * 1549 * NOTE: this will only disable the regulator output if no other consumer 1550 * devices have it enabled, the regulator device supports disabling and 1551 * machine constraints permit this operation. 1552 */ 1553int regulator_disable(struct regulator *regulator) 1554{ 1555 struct regulator_dev *rdev = regulator->rdev; 1556 int ret = 0; 1557 1558 mutex_lock(&rdev->mutex); 1559 ret = _regulator_disable(rdev); 1560 mutex_unlock(&rdev->mutex); 1561 1562 if (ret == 0 && rdev->supply) 1563 regulator_disable(rdev->supply); 1564 1565 return ret; 1566} 1567EXPORT_SYMBOL_GPL(regulator_disable); 1568 1569/* locks held by regulator_force_disable() */ 1570static int _regulator_force_disable(struct regulator_dev *rdev) 1571{ 1572 int ret = 0; 1573 1574 /* force disable */ 1575 if (rdev->desc->ops->disable) { 1576 /* ah well, who wants to live forever... */ 1577 ret = rdev->desc->ops->disable(rdev); 1578 if (ret < 0) { 1579 rdev_err(rdev, "failed to force disable\n"); 1580 return ret; 1581 } 1582 /* notify other consumers that power has been forced off */ 1583 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1584 REGULATOR_EVENT_DISABLE, NULL); 1585 } 1586 1587 return ret; 1588} 1589 1590/** 1591 * regulator_force_disable - force disable regulator output 1592 * @regulator: regulator source 1593 * 1594 * Forcibly disable the regulator output voltage or current. 1595 * NOTE: this *will* disable the regulator output even if other consumer 1596 * devices have it enabled. This should be used for situations when device 1597 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1598 */ 1599int regulator_force_disable(struct regulator *regulator) 1600{ 1601 struct regulator_dev *rdev = regulator->rdev; 1602 int ret; 1603 1604 mutex_lock(&rdev->mutex); 1605 regulator->uA_load = 0; 1606 ret = _regulator_force_disable(regulator->rdev); 1607 mutex_unlock(&rdev->mutex); 1608 1609 if (rdev->supply) 1610 while (rdev->open_count--) 1611 regulator_disable(rdev->supply); 1612 1613 return ret; 1614} 1615EXPORT_SYMBOL_GPL(regulator_force_disable); 1616 1617static void regulator_disable_work(struct work_struct *work) 1618{ 1619 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1620 disable_work.work); 1621 int count, i, ret; 1622 1623 mutex_lock(&rdev->mutex); 1624 1625 BUG_ON(!rdev->deferred_disables); 1626 1627 count = rdev->deferred_disables; 1628 rdev->deferred_disables = 0; 1629 1630 for (i = 0; i < count; i++) { 1631 ret = _regulator_disable(rdev); 1632 if (ret != 0) 1633 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1634 } 1635 1636 mutex_unlock(&rdev->mutex); 1637 1638 if (rdev->supply) { 1639 for (i = 0; i < count; i++) { 1640 ret = regulator_disable(rdev->supply); 1641 if (ret != 0) { 1642 rdev_err(rdev, 1643 "Supply disable failed: %d\n", ret); 1644 } 1645 } 1646 } 1647} 1648 1649/** 1650 * regulator_disable_deferred - disable regulator output with delay 1651 * @regulator: regulator source 1652 * @ms: miliseconds until the regulator is disabled 1653 * 1654 * Execute regulator_disable() on the regulator after a delay. This 1655 * is intended for use with devices that require some time to quiesce. 1656 * 1657 * NOTE: this will only disable the regulator output if no other consumer 1658 * devices have it enabled, the regulator device supports disabling and 1659 * machine constraints permit this operation. 1660 */ 1661int regulator_disable_deferred(struct regulator *regulator, int ms) 1662{ 1663 struct regulator_dev *rdev = regulator->rdev; 1664 int ret; 1665 1666 mutex_lock(&rdev->mutex); 1667 rdev->deferred_disables++; 1668 mutex_unlock(&rdev->mutex); 1669 1670 ret = schedule_delayed_work(&rdev->disable_work, 1671 msecs_to_jiffies(ms)); 1672 if (ret < 0) 1673 return ret; 1674 else 1675 return 0; 1676} 1677EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1678 1679static int _regulator_is_enabled(struct regulator_dev *rdev) 1680{ 1681 /* If we don't know then assume that the regulator is always on */ 1682 if (!rdev->desc->ops->is_enabled) 1683 return 1; 1684 1685 return rdev->desc->ops->is_enabled(rdev); 1686} 1687 1688/** 1689 * regulator_is_enabled - is the regulator output enabled 1690 * @regulator: regulator source 1691 * 1692 * Returns positive if the regulator driver backing the source/client 1693 * has requested that the device be enabled, zero if it hasn't, else a 1694 * negative errno code. 1695 * 1696 * Note that the device backing this regulator handle can have multiple 1697 * users, so it might be enabled even if regulator_enable() was never 1698 * called for this particular source. 1699 */ 1700int regulator_is_enabled(struct regulator *regulator) 1701{ 1702 int ret; 1703 1704 mutex_lock(®ulator->rdev->mutex); 1705 ret = _regulator_is_enabled(regulator->rdev); 1706 mutex_unlock(®ulator->rdev->mutex); 1707 1708 return ret; 1709} 1710EXPORT_SYMBOL_GPL(regulator_is_enabled); 1711 1712/** 1713 * regulator_count_voltages - count regulator_list_voltage() selectors 1714 * @regulator: regulator source 1715 * 1716 * Returns number of selectors, or negative errno. Selectors are 1717 * numbered starting at zero, and typically correspond to bitfields 1718 * in hardware registers. 1719 */ 1720int regulator_count_voltages(struct regulator *regulator) 1721{ 1722 struct regulator_dev *rdev = regulator->rdev; 1723 1724 return rdev->desc->n_voltages ? : -EINVAL; 1725} 1726EXPORT_SYMBOL_GPL(regulator_count_voltages); 1727 1728/** 1729 * regulator_list_voltage - enumerate supported voltages 1730 * @regulator: regulator source 1731 * @selector: identify voltage to list 1732 * Context: can sleep 1733 * 1734 * Returns a voltage that can be passed to @regulator_set_voltage(), 1735 * zero if this selector code can't be used on this system, or a 1736 * negative errno. 1737 */ 1738int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1739{ 1740 struct regulator_dev *rdev = regulator->rdev; 1741 struct regulator_ops *ops = rdev->desc->ops; 1742 int ret; 1743 1744 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1745 return -EINVAL; 1746 1747 mutex_lock(&rdev->mutex); 1748 ret = ops->list_voltage(rdev, selector); 1749 mutex_unlock(&rdev->mutex); 1750 1751 if (ret > 0) { 1752 if (ret < rdev->constraints->min_uV) 1753 ret = 0; 1754 else if (ret > rdev->constraints->max_uV) 1755 ret = 0; 1756 } 1757 1758 return ret; 1759} 1760EXPORT_SYMBOL_GPL(regulator_list_voltage); 1761 1762/** 1763 * regulator_is_supported_voltage - check if a voltage range can be supported 1764 * 1765 * @regulator: Regulator to check. 1766 * @min_uV: Minimum required voltage in uV. 1767 * @max_uV: Maximum required voltage in uV. 1768 * 1769 * Returns a boolean or a negative error code. 1770 */ 1771int regulator_is_supported_voltage(struct regulator *regulator, 1772 int min_uV, int max_uV) 1773{ 1774 int i, voltages, ret; 1775 1776 ret = regulator_count_voltages(regulator); 1777 if (ret < 0) 1778 return ret; 1779 voltages = ret; 1780 1781 for (i = 0; i < voltages; i++) { 1782 ret = regulator_list_voltage(regulator, i); 1783 1784 if (ret >= min_uV && ret <= max_uV) 1785 return 1; 1786 } 1787 1788 return 0; 1789} 1790EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1791 1792static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1793 int min_uV, int max_uV) 1794{ 1795 int ret; 1796 int delay = 0; 1797 unsigned int selector; 1798 1799 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1800 1801 min_uV += rdev->constraints->uV_offset; 1802 max_uV += rdev->constraints->uV_offset; 1803 1804 if (rdev->desc->ops->set_voltage) { 1805 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1806 &selector); 1807 1808 if (rdev->desc->ops->list_voltage) 1809 selector = rdev->desc->ops->list_voltage(rdev, 1810 selector); 1811 else 1812 selector = -1; 1813 } else if (rdev->desc->ops->set_voltage_sel) { 1814 int best_val = INT_MAX; 1815 int i; 1816 1817 selector = 0; 1818 1819 /* Find the smallest voltage that falls within the specified 1820 * range. 1821 */ 1822 for (i = 0; i < rdev->desc->n_voltages; i++) { 1823 ret = rdev->desc->ops->list_voltage(rdev, i); 1824 if (ret < 0) 1825 continue; 1826 1827 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1828 best_val = ret; 1829 selector = i; 1830 } 1831 } 1832 1833 /* 1834 * If we can't obtain the old selector there is not enough 1835 * info to call set_voltage_time_sel(). 1836 */ 1837 if (rdev->desc->ops->set_voltage_time_sel && 1838 rdev->desc->ops->get_voltage_sel) { 1839 unsigned int old_selector = 0; 1840 1841 ret = rdev->desc->ops->get_voltage_sel(rdev); 1842 if (ret < 0) 1843 return ret; 1844 old_selector = ret; 1845 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1846 old_selector, selector); 1847 } 1848 1849 if (best_val != INT_MAX) { 1850 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1851 selector = best_val; 1852 } else { 1853 ret = -EINVAL; 1854 } 1855 } else { 1856 ret = -EINVAL; 1857 } 1858 1859 /* Insert any necessary delays */ 1860 if (delay >= 1000) { 1861 mdelay(delay / 1000); 1862 udelay(delay % 1000); 1863 } else if (delay) { 1864 udelay(delay); 1865 } 1866 1867 if (ret == 0) 1868 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1869 NULL); 1870 1871 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1872 1873 return ret; 1874} 1875 1876/** 1877 * regulator_set_voltage - set regulator output voltage 1878 * @regulator: regulator source 1879 * @min_uV: Minimum required voltage in uV 1880 * @max_uV: Maximum acceptable voltage in uV 1881 * 1882 * Sets a voltage regulator to the desired output voltage. This can be set 1883 * during any regulator state. IOW, regulator can be disabled or enabled. 1884 * 1885 * If the regulator is enabled then the voltage will change to the new value 1886 * immediately otherwise if the regulator is disabled the regulator will 1887 * output at the new voltage when enabled. 1888 * 1889 * NOTE: If the regulator is shared between several devices then the lowest 1890 * request voltage that meets the system constraints will be used. 1891 * Regulator system constraints must be set for this regulator before 1892 * calling this function otherwise this call will fail. 1893 */ 1894int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1895{ 1896 struct regulator_dev *rdev = regulator->rdev; 1897 int ret = 0; 1898 1899 mutex_lock(&rdev->mutex); 1900 1901 /* If we're setting the same range as last time the change 1902 * should be a noop (some cpufreq implementations use the same 1903 * voltage for multiple frequencies, for example). 1904 */ 1905 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1906 goto out; 1907 1908 /* sanity check */ 1909 if (!rdev->desc->ops->set_voltage && 1910 !rdev->desc->ops->set_voltage_sel) { 1911 ret = -EINVAL; 1912 goto out; 1913 } 1914 1915 /* constraints check */ 1916 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1917 if (ret < 0) 1918 goto out; 1919 regulator->min_uV = min_uV; 1920 regulator->max_uV = max_uV; 1921 1922 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1923 if (ret < 0) 1924 goto out; 1925 1926 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1927 1928out: 1929 mutex_unlock(&rdev->mutex); 1930 return ret; 1931} 1932EXPORT_SYMBOL_GPL(regulator_set_voltage); 1933 1934/** 1935 * regulator_set_voltage_time - get raise/fall time 1936 * @regulator: regulator source 1937 * @old_uV: starting voltage in microvolts 1938 * @new_uV: target voltage in microvolts 1939 * 1940 * Provided with the starting and ending voltage, this function attempts to 1941 * calculate the time in microseconds required to rise or fall to this new 1942 * voltage. 1943 */ 1944int regulator_set_voltage_time(struct regulator *regulator, 1945 int old_uV, int new_uV) 1946{ 1947 struct regulator_dev *rdev = regulator->rdev; 1948 struct regulator_ops *ops = rdev->desc->ops; 1949 int old_sel = -1; 1950 int new_sel = -1; 1951 int voltage; 1952 int i; 1953 1954 /* Currently requires operations to do this */ 1955 if (!ops->list_voltage || !ops->set_voltage_time_sel 1956 || !rdev->desc->n_voltages) 1957 return -EINVAL; 1958 1959 for (i = 0; i < rdev->desc->n_voltages; i++) { 1960 /* We only look for exact voltage matches here */ 1961 voltage = regulator_list_voltage(regulator, i); 1962 if (voltage < 0) 1963 return -EINVAL; 1964 if (voltage == 0) 1965 continue; 1966 if (voltage == old_uV) 1967 old_sel = i; 1968 if (voltage == new_uV) 1969 new_sel = i; 1970 } 1971 1972 if (old_sel < 0 || new_sel < 0) 1973 return -EINVAL; 1974 1975 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 1976} 1977EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 1978 1979/** 1980 * regulator_sync_voltage - re-apply last regulator output voltage 1981 * @regulator: regulator source 1982 * 1983 * Re-apply the last configured voltage. This is intended to be used 1984 * where some external control source the consumer is cooperating with 1985 * has caused the configured voltage to change. 1986 */ 1987int regulator_sync_voltage(struct regulator *regulator) 1988{ 1989 struct regulator_dev *rdev = regulator->rdev; 1990 int ret, min_uV, max_uV; 1991 1992 mutex_lock(&rdev->mutex); 1993 1994 if (!rdev->desc->ops->set_voltage && 1995 !rdev->desc->ops->set_voltage_sel) { 1996 ret = -EINVAL; 1997 goto out; 1998 } 1999 2000 /* This is only going to work if we've had a voltage configured. */ 2001 if (!regulator->min_uV && !regulator->max_uV) { 2002 ret = -EINVAL; 2003 goto out; 2004 } 2005 2006 min_uV = regulator->min_uV; 2007 max_uV = regulator->max_uV; 2008 2009 /* This should be a paranoia check... */ 2010 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2011 if (ret < 0) 2012 goto out; 2013 2014 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2015 if (ret < 0) 2016 goto out; 2017 2018 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2019 2020out: 2021 mutex_unlock(&rdev->mutex); 2022 return ret; 2023} 2024EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2025 2026static int _regulator_get_voltage(struct regulator_dev *rdev) 2027{ 2028 int sel, ret; 2029 2030 if (rdev->desc->ops->get_voltage_sel) { 2031 sel = rdev->desc->ops->get_voltage_sel(rdev); 2032 if (sel < 0) 2033 return sel; 2034 ret = rdev->desc->ops->list_voltage(rdev, sel); 2035 } else if (rdev->desc->ops->get_voltage) { 2036 ret = rdev->desc->ops->get_voltage(rdev); 2037 } else { 2038 return -EINVAL; 2039 } 2040 2041 if (ret < 0) 2042 return ret; 2043 return ret - rdev->constraints->uV_offset; 2044} 2045 2046/** 2047 * regulator_get_voltage - get regulator output voltage 2048 * @regulator: regulator source 2049 * 2050 * This returns the current regulator voltage in uV. 2051 * 2052 * NOTE: If the regulator is disabled it will return the voltage value. This 2053 * function should not be used to determine regulator state. 2054 */ 2055int regulator_get_voltage(struct regulator *regulator) 2056{ 2057 int ret; 2058 2059 mutex_lock(®ulator->rdev->mutex); 2060 2061 ret = _regulator_get_voltage(regulator->rdev); 2062 2063 mutex_unlock(®ulator->rdev->mutex); 2064 2065 return ret; 2066} 2067EXPORT_SYMBOL_GPL(regulator_get_voltage); 2068 2069/** 2070 * regulator_set_current_limit - set regulator output current limit 2071 * @regulator: regulator source 2072 * @min_uA: Minimuum supported current in uA 2073 * @max_uA: Maximum supported current in uA 2074 * 2075 * Sets current sink to the desired output current. This can be set during 2076 * any regulator state. IOW, regulator can be disabled or enabled. 2077 * 2078 * If the regulator is enabled then the current will change to the new value 2079 * immediately otherwise if the regulator is disabled the regulator will 2080 * output at the new current when enabled. 2081 * 2082 * NOTE: Regulator system constraints must be set for this regulator before 2083 * calling this function otherwise this call will fail. 2084 */ 2085int regulator_set_current_limit(struct regulator *regulator, 2086 int min_uA, int max_uA) 2087{ 2088 struct regulator_dev *rdev = regulator->rdev; 2089 int ret; 2090 2091 mutex_lock(&rdev->mutex); 2092 2093 /* sanity check */ 2094 if (!rdev->desc->ops->set_current_limit) { 2095 ret = -EINVAL; 2096 goto out; 2097 } 2098 2099 /* constraints check */ 2100 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2101 if (ret < 0) 2102 goto out; 2103 2104 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2105out: 2106 mutex_unlock(&rdev->mutex); 2107 return ret; 2108} 2109EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2110 2111static int _regulator_get_current_limit(struct regulator_dev *rdev) 2112{ 2113 int ret; 2114 2115 mutex_lock(&rdev->mutex); 2116 2117 /* sanity check */ 2118 if (!rdev->desc->ops->get_current_limit) { 2119 ret = -EINVAL; 2120 goto out; 2121 } 2122 2123 ret = rdev->desc->ops->get_current_limit(rdev); 2124out: 2125 mutex_unlock(&rdev->mutex); 2126 return ret; 2127} 2128 2129/** 2130 * regulator_get_current_limit - get regulator output current 2131 * @regulator: regulator source 2132 * 2133 * This returns the current supplied by the specified current sink in uA. 2134 * 2135 * NOTE: If the regulator is disabled it will return the current value. This 2136 * function should not be used to determine regulator state. 2137 */ 2138int regulator_get_current_limit(struct regulator *regulator) 2139{ 2140 return _regulator_get_current_limit(regulator->rdev); 2141} 2142EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2143 2144/** 2145 * regulator_set_mode - set regulator operating mode 2146 * @regulator: regulator source 2147 * @mode: operating mode - one of the REGULATOR_MODE constants 2148 * 2149 * Set regulator operating mode to increase regulator efficiency or improve 2150 * regulation performance. 2151 * 2152 * NOTE: Regulator system constraints must be set for this regulator before 2153 * calling this function otherwise this call will fail. 2154 */ 2155int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2156{ 2157 struct regulator_dev *rdev = regulator->rdev; 2158 int ret; 2159 int regulator_curr_mode; 2160 2161 mutex_lock(&rdev->mutex); 2162 2163 /* sanity check */ 2164 if (!rdev->desc->ops->set_mode) { 2165 ret = -EINVAL; 2166 goto out; 2167 } 2168 2169 /* return if the same mode is requested */ 2170 if (rdev->desc->ops->get_mode) { 2171 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2172 if (regulator_curr_mode == mode) { 2173 ret = 0; 2174 goto out; 2175 } 2176 } 2177 2178 /* constraints check */ 2179 ret = regulator_mode_constrain(rdev, &mode); 2180 if (ret < 0) 2181 goto out; 2182 2183 ret = rdev->desc->ops->set_mode(rdev, mode); 2184out: 2185 mutex_unlock(&rdev->mutex); 2186 return ret; 2187} 2188EXPORT_SYMBOL_GPL(regulator_set_mode); 2189 2190static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2191{ 2192 int ret; 2193 2194 mutex_lock(&rdev->mutex); 2195 2196 /* sanity check */ 2197 if (!rdev->desc->ops->get_mode) { 2198 ret = -EINVAL; 2199 goto out; 2200 } 2201 2202 ret = rdev->desc->ops->get_mode(rdev); 2203out: 2204 mutex_unlock(&rdev->mutex); 2205 return ret; 2206} 2207 2208/** 2209 * regulator_get_mode - get regulator operating mode 2210 * @regulator: regulator source 2211 * 2212 * Get the current regulator operating mode. 2213 */ 2214unsigned int regulator_get_mode(struct regulator *regulator) 2215{ 2216 return _regulator_get_mode(regulator->rdev); 2217} 2218EXPORT_SYMBOL_GPL(regulator_get_mode); 2219 2220/** 2221 * regulator_set_optimum_mode - set regulator optimum operating mode 2222 * @regulator: regulator source 2223 * @uA_load: load current 2224 * 2225 * Notifies the regulator core of a new device load. This is then used by 2226 * DRMS (if enabled by constraints) to set the most efficient regulator 2227 * operating mode for the new regulator loading. 2228 * 2229 * Consumer devices notify their supply regulator of the maximum power 2230 * they will require (can be taken from device datasheet in the power 2231 * consumption tables) when they change operational status and hence power 2232 * state. Examples of operational state changes that can affect power 2233 * consumption are :- 2234 * 2235 * o Device is opened / closed. 2236 * o Device I/O is about to begin or has just finished. 2237 * o Device is idling in between work. 2238 * 2239 * This information is also exported via sysfs to userspace. 2240 * 2241 * DRMS will sum the total requested load on the regulator and change 2242 * to the most efficient operating mode if platform constraints allow. 2243 * 2244 * Returns the new regulator mode or error. 2245 */ 2246int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2247{ 2248 struct regulator_dev *rdev = regulator->rdev; 2249 struct regulator *consumer; 2250 int ret, output_uV, input_uV, total_uA_load = 0; 2251 unsigned int mode; 2252 2253 mutex_lock(&rdev->mutex); 2254 2255 /* 2256 * first check to see if we can set modes at all, otherwise just 2257 * tell the consumer everything is OK. 2258 */ 2259 regulator->uA_load = uA_load; 2260 ret = regulator_check_drms(rdev); 2261 if (ret < 0) { 2262 ret = 0; 2263 goto out; 2264 } 2265 2266 if (!rdev->desc->ops->get_optimum_mode) 2267 goto out; 2268 2269 /* 2270 * we can actually do this so any errors are indicators of 2271 * potential real failure. 2272 */ 2273 ret = -EINVAL; 2274 2275 /* get output voltage */ 2276 output_uV = _regulator_get_voltage(rdev); 2277 if (output_uV <= 0) { 2278 rdev_err(rdev, "invalid output voltage found\n"); 2279 goto out; 2280 } 2281 2282 /* get input voltage */ 2283 input_uV = 0; 2284 if (rdev->supply) 2285 input_uV = regulator_get_voltage(rdev->supply); 2286 if (input_uV <= 0) 2287 input_uV = rdev->constraints->input_uV; 2288 if (input_uV <= 0) { 2289 rdev_err(rdev, "invalid input voltage found\n"); 2290 goto out; 2291 } 2292 2293 /* calc total requested load for this regulator */ 2294 list_for_each_entry(consumer, &rdev->consumer_list, list) 2295 total_uA_load += consumer->uA_load; 2296 2297 mode = rdev->desc->ops->get_optimum_mode(rdev, 2298 input_uV, output_uV, 2299 total_uA_load); 2300 ret = regulator_mode_constrain(rdev, &mode); 2301 if (ret < 0) { 2302 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2303 total_uA_load, input_uV, output_uV); 2304 goto out; 2305 } 2306 2307 ret = rdev->desc->ops->set_mode(rdev, mode); 2308 if (ret < 0) { 2309 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2310 goto out; 2311 } 2312 ret = mode; 2313out: 2314 mutex_unlock(&rdev->mutex); 2315 return ret; 2316} 2317EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2318 2319/** 2320 * regulator_register_notifier - register regulator event notifier 2321 * @regulator: regulator source 2322 * @nb: notifier block 2323 * 2324 * Register notifier block to receive regulator events. 2325 */ 2326int regulator_register_notifier(struct regulator *regulator, 2327 struct notifier_block *nb) 2328{ 2329 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2330 nb); 2331} 2332EXPORT_SYMBOL_GPL(regulator_register_notifier); 2333 2334/** 2335 * regulator_unregister_notifier - unregister regulator event notifier 2336 * @regulator: regulator source 2337 * @nb: notifier block 2338 * 2339 * Unregister regulator event notifier block. 2340 */ 2341int regulator_unregister_notifier(struct regulator *regulator, 2342 struct notifier_block *nb) 2343{ 2344 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2345 nb); 2346} 2347EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2348 2349/* notify regulator consumers and downstream regulator consumers. 2350 * Note mutex must be held by caller. 2351 */ 2352static void _notifier_call_chain(struct regulator_dev *rdev, 2353 unsigned long event, void *data) 2354{ 2355 /* call rdev chain first */ 2356 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2357} 2358 2359/** 2360 * regulator_bulk_get - get multiple regulator consumers 2361 * 2362 * @dev: Device to supply 2363 * @num_consumers: Number of consumers to register 2364 * @consumers: Configuration of consumers; clients are stored here. 2365 * 2366 * @return 0 on success, an errno on failure. 2367 * 2368 * This helper function allows drivers to get several regulator 2369 * consumers in one operation. If any of the regulators cannot be 2370 * acquired then any regulators that were allocated will be freed 2371 * before returning to the caller. 2372 */ 2373int regulator_bulk_get(struct device *dev, int num_consumers, 2374 struct regulator_bulk_data *consumers) 2375{ 2376 int i; 2377 int ret; 2378 2379 for (i = 0; i < num_consumers; i++) 2380 consumers[i].consumer = NULL; 2381 2382 for (i = 0; i < num_consumers; i++) { 2383 consumers[i].consumer = regulator_get(dev, 2384 consumers[i].supply); 2385 if (IS_ERR(consumers[i].consumer)) { 2386 ret = PTR_ERR(consumers[i].consumer); 2387 dev_err(dev, "Failed to get supply '%s': %d\n", 2388 consumers[i].supply, ret); 2389 consumers[i].consumer = NULL; 2390 goto err; 2391 } 2392 } 2393 2394 return 0; 2395 2396err: 2397 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2398 regulator_put(consumers[i].consumer); 2399 2400 return ret; 2401} 2402EXPORT_SYMBOL_GPL(regulator_bulk_get); 2403 2404static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2405{ 2406 struct regulator_bulk_data *bulk = data; 2407 2408 bulk->ret = regulator_enable(bulk->consumer); 2409} 2410 2411/** 2412 * regulator_bulk_enable - enable multiple regulator consumers 2413 * 2414 * @num_consumers: Number of consumers 2415 * @consumers: Consumer data; clients are stored here. 2416 * @return 0 on success, an errno on failure 2417 * 2418 * This convenience API allows consumers to enable multiple regulator 2419 * clients in a single API call. If any consumers cannot be enabled 2420 * then any others that were enabled will be disabled again prior to 2421 * return. 2422 */ 2423int regulator_bulk_enable(int num_consumers, 2424 struct regulator_bulk_data *consumers) 2425{ 2426 LIST_HEAD(async_domain); 2427 int i; 2428 int ret = 0; 2429 2430 for (i = 0; i < num_consumers; i++) 2431 async_schedule_domain(regulator_bulk_enable_async, 2432 &consumers[i], &async_domain); 2433 2434 async_synchronize_full_domain(&async_domain); 2435 2436 /* If any consumer failed we need to unwind any that succeeded */ 2437 for (i = 0; i < num_consumers; i++) { 2438 if (consumers[i].ret != 0) { 2439 ret = consumers[i].ret; 2440 goto err; 2441 } 2442 } 2443 2444 return 0; 2445 2446err: 2447 for (i = 0; i < num_consumers; i++) 2448 if (consumers[i].ret == 0) 2449 regulator_disable(consumers[i].consumer); 2450 else 2451 pr_err("Failed to enable %s: %d\n", 2452 consumers[i].supply, consumers[i].ret); 2453 2454 return ret; 2455} 2456EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2457 2458/** 2459 * regulator_bulk_disable - disable multiple regulator consumers 2460 * 2461 * @num_consumers: Number of consumers 2462 * @consumers: Consumer data; clients are stored here. 2463 * @return 0 on success, an errno on failure 2464 * 2465 * This convenience API allows consumers to disable multiple regulator 2466 * clients in a single API call. If any consumers cannot be enabled 2467 * then any others that were disabled will be disabled again prior to 2468 * return. 2469 */ 2470int regulator_bulk_disable(int num_consumers, 2471 struct regulator_bulk_data *consumers) 2472{ 2473 int i; 2474 int ret; 2475 2476 for (i = 0; i < num_consumers; i++) { 2477 ret = regulator_disable(consumers[i].consumer); 2478 if (ret != 0) 2479 goto err; 2480 } 2481 2482 return 0; 2483 2484err: 2485 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2486 for (--i; i >= 0; --i) 2487 regulator_enable(consumers[i].consumer); 2488 2489 return ret; 2490} 2491EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2492 2493/** 2494 * regulator_bulk_force_disable - force disable multiple regulator consumers 2495 * 2496 * @num_consumers: Number of consumers 2497 * @consumers: Consumer data; clients are stored here. 2498 * @return 0 on success, an errno on failure 2499 * 2500 * This convenience API allows consumers to forcibly disable multiple regulator 2501 * clients in a single API call. 2502 * NOTE: This should be used for situations when device damage will 2503 * likely occur if the regulators are not disabled (e.g. over temp). 2504 * Although regulator_force_disable function call for some consumers can 2505 * return error numbers, the function is called for all consumers. 2506 */ 2507int regulator_bulk_force_disable(int num_consumers, 2508 struct regulator_bulk_data *consumers) 2509{ 2510 int i; 2511 int ret; 2512 2513 for (i = 0; i < num_consumers; i++) 2514 consumers[i].ret = 2515 regulator_force_disable(consumers[i].consumer); 2516 2517 for (i = 0; i < num_consumers; i++) { 2518 if (consumers[i].ret != 0) { 2519 ret = consumers[i].ret; 2520 goto out; 2521 } 2522 } 2523 2524 return 0; 2525out: 2526 return ret; 2527} 2528EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2529 2530/** 2531 * regulator_bulk_free - free multiple regulator consumers 2532 * 2533 * @num_consumers: Number of consumers 2534 * @consumers: Consumer data; clients are stored here. 2535 * 2536 * This convenience API allows consumers to free multiple regulator 2537 * clients in a single API call. 2538 */ 2539void regulator_bulk_free(int num_consumers, 2540 struct regulator_bulk_data *consumers) 2541{ 2542 int i; 2543 2544 for (i = 0; i < num_consumers; i++) { 2545 regulator_put(consumers[i].consumer); 2546 consumers[i].consumer = NULL; 2547 } 2548} 2549EXPORT_SYMBOL_GPL(regulator_bulk_free); 2550 2551/** 2552 * regulator_notifier_call_chain - call regulator event notifier 2553 * @rdev: regulator source 2554 * @event: notifier block 2555 * @data: callback-specific data. 2556 * 2557 * Called by regulator drivers to notify clients a regulator event has 2558 * occurred. We also notify regulator clients downstream. 2559 * Note lock must be held by caller. 2560 */ 2561int regulator_notifier_call_chain(struct regulator_dev *rdev, 2562 unsigned long event, void *data) 2563{ 2564 _notifier_call_chain(rdev, event, data); 2565 return NOTIFY_DONE; 2566 2567} 2568EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2569 2570/** 2571 * regulator_mode_to_status - convert a regulator mode into a status 2572 * 2573 * @mode: Mode to convert 2574 * 2575 * Convert a regulator mode into a status. 2576 */ 2577int regulator_mode_to_status(unsigned int mode) 2578{ 2579 switch (mode) { 2580 case REGULATOR_MODE_FAST: 2581 return REGULATOR_STATUS_FAST; 2582 case REGULATOR_MODE_NORMAL: 2583 return REGULATOR_STATUS_NORMAL; 2584 case REGULATOR_MODE_IDLE: 2585 return REGULATOR_STATUS_IDLE; 2586 case REGULATOR_STATUS_STANDBY: 2587 return REGULATOR_STATUS_STANDBY; 2588 default: 2589 return 0; 2590 } 2591} 2592EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2593 2594/* 2595 * To avoid cluttering sysfs (and memory) with useless state, only 2596 * create attributes that can be meaningfully displayed. 2597 */ 2598static int add_regulator_attributes(struct regulator_dev *rdev) 2599{ 2600 struct device *dev = &rdev->dev; 2601 struct regulator_ops *ops = rdev->desc->ops; 2602 int status = 0; 2603 2604 /* some attributes need specific methods to be displayed */ 2605 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2606 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2607 status = device_create_file(dev, &dev_attr_microvolts); 2608 if (status < 0) 2609 return status; 2610 } 2611 if (ops->get_current_limit) { 2612 status = device_create_file(dev, &dev_attr_microamps); 2613 if (status < 0) 2614 return status; 2615 } 2616 if (ops->get_mode) { 2617 status = device_create_file(dev, &dev_attr_opmode); 2618 if (status < 0) 2619 return status; 2620 } 2621 if (ops->is_enabled) { 2622 status = device_create_file(dev, &dev_attr_state); 2623 if (status < 0) 2624 return status; 2625 } 2626 if (ops->get_status) { 2627 status = device_create_file(dev, &dev_attr_status); 2628 if (status < 0) 2629 return status; 2630 } 2631 2632 /* some attributes are type-specific */ 2633 if (rdev->desc->type == REGULATOR_CURRENT) { 2634 status = device_create_file(dev, &dev_attr_requested_microamps); 2635 if (status < 0) 2636 return status; 2637 } 2638 2639 /* all the other attributes exist to support constraints; 2640 * don't show them if there are no constraints, or if the 2641 * relevant supporting methods are missing. 2642 */ 2643 if (!rdev->constraints) 2644 return status; 2645 2646 /* constraints need specific supporting methods */ 2647 if (ops->set_voltage || ops->set_voltage_sel) { 2648 status = device_create_file(dev, &dev_attr_min_microvolts); 2649 if (status < 0) 2650 return status; 2651 status = device_create_file(dev, &dev_attr_max_microvolts); 2652 if (status < 0) 2653 return status; 2654 } 2655 if (ops->set_current_limit) { 2656 status = device_create_file(dev, &dev_attr_min_microamps); 2657 if (status < 0) 2658 return status; 2659 status = device_create_file(dev, &dev_attr_max_microamps); 2660 if (status < 0) 2661 return status; 2662 } 2663 2664 /* suspend mode constraints need multiple supporting methods */ 2665 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2666 return status; 2667 2668 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2669 if (status < 0) 2670 return status; 2671 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2672 if (status < 0) 2673 return status; 2674 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2675 if (status < 0) 2676 return status; 2677 2678 if (ops->set_suspend_voltage) { 2679 status = device_create_file(dev, 2680 &dev_attr_suspend_standby_microvolts); 2681 if (status < 0) 2682 return status; 2683 status = device_create_file(dev, 2684 &dev_attr_suspend_mem_microvolts); 2685 if (status < 0) 2686 return status; 2687 status = device_create_file(dev, 2688 &dev_attr_suspend_disk_microvolts); 2689 if (status < 0) 2690 return status; 2691 } 2692 2693 if (ops->set_suspend_mode) { 2694 status = device_create_file(dev, 2695 &dev_attr_suspend_standby_mode); 2696 if (status < 0) 2697 return status; 2698 status = device_create_file(dev, 2699 &dev_attr_suspend_mem_mode); 2700 if (status < 0) 2701 return status; 2702 status = device_create_file(dev, 2703 &dev_attr_suspend_disk_mode); 2704 if (status < 0) 2705 return status; 2706 } 2707 2708 return status; 2709} 2710 2711static void rdev_init_debugfs(struct regulator_dev *rdev) 2712{ 2713#ifdef CONFIG_DEBUG_FS 2714 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2715 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2716 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2717 rdev->debugfs = NULL; 2718 return; 2719 } 2720 2721 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2722 &rdev->use_count); 2723 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2724 &rdev->open_count); 2725#endif 2726} 2727 2728/** 2729 * regulator_register - register regulator 2730 * @regulator_desc: regulator to register 2731 * @dev: struct device for the regulator 2732 * @init_data: platform provided init data, passed through by driver 2733 * @driver_data: private regulator data 2734 * @of_node: OpenFirmware node to parse for device tree bindings (may be 2735 * NULL). 2736 * 2737 * Called by regulator drivers to register a regulator. 2738 * Returns 0 on success. 2739 */ 2740struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2741 struct device *dev, const struct regulator_init_data *init_data, 2742 void *driver_data, struct device_node *of_node) 2743{ 2744 const struct regulation_constraints *constraints = NULL; 2745 static atomic_t regulator_no = ATOMIC_INIT(0); 2746 struct regulator_dev *rdev; 2747 int ret, i; 2748 const char *supply = NULL; 2749 2750 if (regulator_desc == NULL) 2751 return ERR_PTR(-EINVAL); 2752 2753 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2754 return ERR_PTR(-EINVAL); 2755 2756 if (regulator_desc->type != REGULATOR_VOLTAGE && 2757 regulator_desc->type != REGULATOR_CURRENT) 2758 return ERR_PTR(-EINVAL); 2759 2760 /* Only one of each should be implemented */ 2761 WARN_ON(regulator_desc->ops->get_voltage && 2762 regulator_desc->ops->get_voltage_sel); 2763 WARN_ON(regulator_desc->ops->set_voltage && 2764 regulator_desc->ops->set_voltage_sel); 2765 2766 /* If we're using selectors we must implement list_voltage. */ 2767 if (regulator_desc->ops->get_voltage_sel && 2768 !regulator_desc->ops->list_voltage) { 2769 return ERR_PTR(-EINVAL); 2770 } 2771 if (regulator_desc->ops->set_voltage_sel && 2772 !regulator_desc->ops->list_voltage) { 2773 return ERR_PTR(-EINVAL); 2774 } 2775 2776 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2777 if (rdev == NULL) 2778 return ERR_PTR(-ENOMEM); 2779 2780 mutex_lock(®ulator_list_mutex); 2781 2782 mutex_init(&rdev->mutex); 2783 rdev->reg_data = driver_data; 2784 rdev->owner = regulator_desc->owner; 2785 rdev->desc = regulator_desc; 2786 INIT_LIST_HEAD(&rdev->consumer_list); 2787 INIT_LIST_HEAD(&rdev->list); 2788 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2789 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2790 2791 /* preform any regulator specific init */ 2792 if (init_data && init_data->regulator_init) { 2793 ret = init_data->regulator_init(rdev->reg_data); 2794 if (ret < 0) 2795 goto clean; 2796 } 2797 2798 /* register with sysfs */ 2799 rdev->dev.class = ®ulator_class; 2800 rdev->dev.of_node = of_node; 2801 rdev->dev.parent = dev; 2802 dev_set_name(&rdev->dev, "regulator.%d", 2803 atomic_inc_return(®ulator_no) - 1); 2804 ret = device_register(&rdev->dev); 2805 if (ret != 0) { 2806 put_device(&rdev->dev); 2807 goto clean; 2808 } 2809 2810 dev_set_drvdata(&rdev->dev, rdev); 2811 2812 /* set regulator constraints */ 2813 if (init_data) 2814 constraints = &init_data->constraints; 2815 2816 ret = set_machine_constraints(rdev, constraints); 2817 if (ret < 0) 2818 goto scrub; 2819 2820 /* add attributes supported by this regulator */ 2821 ret = add_regulator_attributes(rdev); 2822 if (ret < 0) 2823 goto scrub; 2824 2825 if (init_data && init_data->supply_regulator) 2826 supply = init_data->supply_regulator; 2827 else if (regulator_desc->supply_name) 2828 supply = regulator_desc->supply_name; 2829 2830 if (supply) { 2831 struct regulator_dev *r; 2832 2833 r = regulator_dev_lookup(dev, supply); 2834 2835 if (!r) { 2836 dev_err(dev, "Failed to find supply %s\n", supply); 2837 ret = -ENODEV; 2838 goto scrub; 2839 } 2840 2841 ret = set_supply(rdev, r); 2842 if (ret < 0) 2843 goto scrub; 2844 2845 /* Enable supply if rail is enabled */ 2846 if (rdev->desc->ops->is_enabled && 2847 rdev->desc->ops->is_enabled(rdev)) { 2848 ret = regulator_enable(rdev->supply); 2849 if (ret < 0) 2850 goto scrub; 2851 } 2852 } 2853 2854 /* add consumers devices */ 2855 if (init_data) { 2856 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2857 ret = set_consumer_device_supply(rdev, 2858 init_data->consumer_supplies[i].dev, 2859 init_data->consumer_supplies[i].dev_name, 2860 init_data->consumer_supplies[i].supply); 2861 if (ret < 0) { 2862 dev_err(dev, "Failed to set supply %s\n", 2863 init_data->consumer_supplies[i].supply); 2864 goto unset_supplies; 2865 } 2866 } 2867 } 2868 2869 list_add(&rdev->list, ®ulator_list); 2870 2871 rdev_init_debugfs(rdev); 2872out: 2873 mutex_unlock(®ulator_list_mutex); 2874 return rdev; 2875 2876unset_supplies: 2877 unset_regulator_supplies(rdev); 2878 2879scrub: 2880 kfree(rdev->constraints); 2881 device_unregister(&rdev->dev); 2882 /* device core frees rdev */ 2883 rdev = ERR_PTR(ret); 2884 goto out; 2885 2886clean: 2887 kfree(rdev); 2888 rdev = ERR_PTR(ret); 2889 goto out; 2890} 2891EXPORT_SYMBOL_GPL(regulator_register); 2892 2893/** 2894 * regulator_unregister - unregister regulator 2895 * @rdev: regulator to unregister 2896 * 2897 * Called by regulator drivers to unregister a regulator. 2898 */ 2899void regulator_unregister(struct regulator_dev *rdev) 2900{ 2901 if (rdev == NULL) 2902 return; 2903 2904 mutex_lock(®ulator_list_mutex); 2905#ifdef CONFIG_DEBUG_FS 2906 debugfs_remove_recursive(rdev->debugfs); 2907#endif 2908 flush_work_sync(&rdev->disable_work.work); 2909 WARN_ON(rdev->open_count); 2910 unset_regulator_supplies(rdev); 2911 list_del(&rdev->list); 2912 if (rdev->supply) 2913 regulator_put(rdev->supply); 2914 kfree(rdev->constraints); 2915 device_unregister(&rdev->dev); 2916 mutex_unlock(®ulator_list_mutex); 2917} 2918EXPORT_SYMBOL_GPL(regulator_unregister); 2919 2920/** 2921 * regulator_suspend_prepare - prepare regulators for system wide suspend 2922 * @state: system suspend state 2923 * 2924 * Configure each regulator with it's suspend operating parameters for state. 2925 * This will usually be called by machine suspend code prior to supending. 2926 */ 2927int regulator_suspend_prepare(suspend_state_t state) 2928{ 2929 struct regulator_dev *rdev; 2930 int ret = 0; 2931 2932 /* ON is handled by regulator active state */ 2933 if (state == PM_SUSPEND_ON) 2934 return -EINVAL; 2935 2936 mutex_lock(®ulator_list_mutex); 2937 list_for_each_entry(rdev, ®ulator_list, list) { 2938 2939 mutex_lock(&rdev->mutex); 2940 ret = suspend_prepare(rdev, state); 2941 mutex_unlock(&rdev->mutex); 2942 2943 if (ret < 0) { 2944 rdev_err(rdev, "failed to prepare\n"); 2945 goto out; 2946 } 2947 } 2948out: 2949 mutex_unlock(®ulator_list_mutex); 2950 return ret; 2951} 2952EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2953 2954/** 2955 * regulator_suspend_finish - resume regulators from system wide suspend 2956 * 2957 * Turn on regulators that might be turned off by regulator_suspend_prepare 2958 * and that should be turned on according to the regulators properties. 2959 */ 2960int regulator_suspend_finish(void) 2961{ 2962 struct regulator_dev *rdev; 2963 int ret = 0, error; 2964 2965 mutex_lock(®ulator_list_mutex); 2966 list_for_each_entry(rdev, ®ulator_list, list) { 2967 struct regulator_ops *ops = rdev->desc->ops; 2968 2969 mutex_lock(&rdev->mutex); 2970 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 2971 ops->enable) { 2972 error = ops->enable(rdev); 2973 if (error) 2974 ret = error; 2975 } else { 2976 if (!has_full_constraints) 2977 goto unlock; 2978 if (!ops->disable) 2979 goto unlock; 2980 if (ops->is_enabled && !ops->is_enabled(rdev)) 2981 goto unlock; 2982 2983 error = ops->disable(rdev); 2984 if (error) 2985 ret = error; 2986 } 2987unlock: 2988 mutex_unlock(&rdev->mutex); 2989 } 2990 mutex_unlock(®ulator_list_mutex); 2991 return ret; 2992} 2993EXPORT_SYMBOL_GPL(regulator_suspend_finish); 2994 2995/** 2996 * regulator_has_full_constraints - the system has fully specified constraints 2997 * 2998 * Calling this function will cause the regulator API to disable all 2999 * regulators which have a zero use count and don't have an always_on 3000 * constraint in a late_initcall. 3001 * 3002 * The intention is that this will become the default behaviour in a 3003 * future kernel release so users are encouraged to use this facility 3004 * now. 3005 */ 3006void regulator_has_full_constraints(void) 3007{ 3008 has_full_constraints = 1; 3009} 3010EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3011 3012/** 3013 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3014 * 3015 * Calling this function will cause the regulator API to provide a 3016 * dummy regulator to consumers if no physical regulator is found, 3017 * allowing most consumers to proceed as though a regulator were 3018 * configured. This allows systems such as those with software 3019 * controllable regulators for the CPU core only to be brought up more 3020 * readily. 3021 */ 3022void regulator_use_dummy_regulator(void) 3023{ 3024 board_wants_dummy_regulator = true; 3025} 3026EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3027 3028/** 3029 * rdev_get_drvdata - get rdev regulator driver data 3030 * @rdev: regulator 3031 * 3032 * Get rdev regulator driver private data. This call can be used in the 3033 * regulator driver context. 3034 */ 3035void *rdev_get_drvdata(struct regulator_dev *rdev) 3036{ 3037 return rdev->reg_data; 3038} 3039EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3040 3041/** 3042 * regulator_get_drvdata - get regulator driver data 3043 * @regulator: regulator 3044 * 3045 * Get regulator driver private data. This call can be used in the consumer 3046 * driver context when non API regulator specific functions need to be called. 3047 */ 3048void *regulator_get_drvdata(struct regulator *regulator) 3049{ 3050 return regulator->rdev->reg_data; 3051} 3052EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3053 3054/** 3055 * regulator_set_drvdata - set regulator driver data 3056 * @regulator: regulator 3057 * @data: data 3058 */ 3059void regulator_set_drvdata(struct regulator *regulator, void *data) 3060{ 3061 regulator->rdev->reg_data = data; 3062} 3063EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3064 3065/** 3066 * regulator_get_id - get regulator ID 3067 * @rdev: regulator 3068 */ 3069int rdev_get_id(struct regulator_dev *rdev) 3070{ 3071 return rdev->desc->id; 3072} 3073EXPORT_SYMBOL_GPL(rdev_get_id); 3074 3075struct device *rdev_get_dev(struct regulator_dev *rdev) 3076{ 3077 return &rdev->dev; 3078} 3079EXPORT_SYMBOL_GPL(rdev_get_dev); 3080 3081void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3082{ 3083 return reg_init_data->driver_data; 3084} 3085EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3086 3087#ifdef CONFIG_DEBUG_FS 3088static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3089 size_t count, loff_t *ppos) 3090{ 3091 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3092 ssize_t len, ret = 0; 3093 struct regulator_map *map; 3094 3095 if (!buf) 3096 return -ENOMEM; 3097 3098 list_for_each_entry(map, ®ulator_map_list, list) { 3099 len = snprintf(buf + ret, PAGE_SIZE - ret, 3100 "%s -> %s.%s\n", 3101 rdev_get_name(map->regulator), map->dev_name, 3102 map->supply); 3103 if (len >= 0) 3104 ret += len; 3105 if (ret > PAGE_SIZE) { 3106 ret = PAGE_SIZE; 3107 break; 3108 } 3109 } 3110 3111 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3112 3113 kfree(buf); 3114 3115 return ret; 3116} 3117 3118static const struct file_operations supply_map_fops = { 3119 .read = supply_map_read_file, 3120 .llseek = default_llseek, 3121}; 3122#endif 3123 3124static int __init regulator_init(void) 3125{ 3126 int ret; 3127 3128 ret = class_register(®ulator_class); 3129 3130#ifdef CONFIG_DEBUG_FS 3131 debugfs_root = debugfs_create_dir("regulator", NULL); 3132 if (IS_ERR(debugfs_root) || !debugfs_root) { 3133 pr_warn("regulator: Failed to create debugfs directory\n"); 3134 debugfs_root = NULL; 3135 } 3136 3137 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3138 NULL, &supply_map_fops))) 3139 pr_warn("regulator: Failed to create supplies debugfs\n"); 3140#endif 3141 3142 regulator_dummy_init(); 3143 3144 return ret; 3145} 3146 3147/* init early to allow our consumers to complete system booting */ 3148core_initcall(regulator_init); 3149 3150static int __init regulator_init_complete(void) 3151{ 3152 struct regulator_dev *rdev; 3153 struct regulator_ops *ops; 3154 struct regulation_constraints *c; 3155 int enabled, ret; 3156 3157 mutex_lock(®ulator_list_mutex); 3158 3159 /* If we have a full configuration then disable any regulators 3160 * which are not in use or always_on. This will become the 3161 * default behaviour in the future. 3162 */ 3163 list_for_each_entry(rdev, ®ulator_list, list) { 3164 ops = rdev->desc->ops; 3165 c = rdev->constraints; 3166 3167 if (!ops->disable || (c && c->always_on)) 3168 continue; 3169 3170 mutex_lock(&rdev->mutex); 3171 3172 if (rdev->use_count) 3173 goto unlock; 3174 3175 /* If we can't read the status assume it's on. */ 3176 if (ops->is_enabled) 3177 enabled = ops->is_enabled(rdev); 3178 else 3179 enabled = 1; 3180 3181 if (!enabled) 3182 goto unlock; 3183 3184 if (has_full_constraints) { 3185 /* We log since this may kill the system if it 3186 * goes wrong. */ 3187 rdev_info(rdev, "disabling\n"); 3188 ret = ops->disable(rdev); 3189 if (ret != 0) { 3190 rdev_err(rdev, "couldn't disable: %d\n", ret); 3191 } 3192 } else { 3193 /* The intention is that in future we will 3194 * assume that full constraints are provided 3195 * so warn even if we aren't going to do 3196 * anything here. 3197 */ 3198 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3199 } 3200 3201unlock: 3202 mutex_unlock(&rdev->mutex); 3203 } 3204 3205 mutex_unlock(®ulator_list_mutex); 3206 3207 return 0; 3208} 3209late_initcall(regulator_init_complete); 3210