core.c revision e6e740304aa2a49ef09497e6c0bb906ed7987f6b
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 1323static void devm_regulator_release(struct device *dev, void *res) 1324{ 1325 regulator_put(*(struct regulator **)res); 1326} 1327 1328/** 1329 * devm_regulator_get - Resource managed regulator_get() 1330 * @dev: device for regulator "consumer" 1331 * @id: Supply name or regulator ID. 1332 * 1333 * Managed regulator_get(). Regulators returned from this function are 1334 * automatically regulator_put() on driver detach. See regulator_get() for more 1335 * information. 1336 */ 1337struct regulator *devm_regulator_get(struct device *dev, const char *id) 1338{ 1339 struct regulator **ptr, *regulator; 1340 1341 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1342 if (!ptr) 1343 return ERR_PTR(-ENOMEM); 1344 1345 regulator = regulator_get(dev, id); 1346 if (!IS_ERR(regulator)) { 1347 *ptr = regulator; 1348 devres_add(dev, ptr); 1349 } else { 1350 devres_free(ptr); 1351 } 1352 1353 return regulator; 1354} 1355EXPORT_SYMBOL_GPL(devm_regulator_get); 1356 1357/** 1358 * regulator_get_exclusive - obtain exclusive access to a regulator. 1359 * @dev: device for regulator "consumer" 1360 * @id: Supply name or regulator ID. 1361 * 1362 * Returns a struct regulator corresponding to the regulator producer, 1363 * or IS_ERR() condition containing errno. Other consumers will be 1364 * unable to obtain this reference is held and the use count for the 1365 * regulator will be initialised to reflect the current state of the 1366 * regulator. 1367 * 1368 * This is intended for use by consumers which cannot tolerate shared 1369 * use of the regulator such as those which need to force the 1370 * regulator off for correct operation of the hardware they are 1371 * controlling. 1372 * 1373 * Use of supply names configured via regulator_set_device_supply() is 1374 * strongly encouraged. It is recommended that the supply name used 1375 * should match the name used for the supply and/or the relevant 1376 * device pins in the datasheet. 1377 */ 1378struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1379{ 1380 return _regulator_get(dev, id, 1); 1381} 1382EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1383 1384/** 1385 * regulator_put - "free" the regulator source 1386 * @regulator: regulator source 1387 * 1388 * Note: drivers must ensure that all regulator_enable calls made on this 1389 * regulator source are balanced by regulator_disable calls prior to calling 1390 * this function. 1391 */ 1392void regulator_put(struct regulator *regulator) 1393{ 1394 struct regulator_dev *rdev; 1395 1396 if (regulator == NULL || IS_ERR(regulator)) 1397 return; 1398 1399 mutex_lock(®ulator_list_mutex); 1400 rdev = regulator->rdev; 1401 1402#ifdef CONFIG_DEBUG_FS 1403 debugfs_remove_recursive(regulator->debugfs); 1404#endif 1405 1406 /* remove any sysfs entries */ 1407 if (regulator->dev) { 1408 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1409 device_remove_file(regulator->dev, ®ulator->dev_attr); 1410 kfree(regulator->dev_attr.attr.name); 1411 } 1412 kfree(regulator->supply_name); 1413 list_del(®ulator->list); 1414 kfree(regulator); 1415 1416 rdev->open_count--; 1417 rdev->exclusive = 0; 1418 1419 module_put(rdev->owner); 1420 mutex_unlock(®ulator_list_mutex); 1421} 1422EXPORT_SYMBOL_GPL(regulator_put); 1423 1424static int devm_regulator_match(struct device *dev, void *res, void *data) 1425{ 1426 struct regulator **r = res; 1427 if (!r || !*r) { 1428 WARN_ON(!r || !*r); 1429 return 0; 1430 } 1431 return *r == data; 1432} 1433 1434/** 1435 * devm_regulator_put - Resource managed regulator_put() 1436 * @regulator: regulator to free 1437 * 1438 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1439 * this function will not need to be called and the resource management 1440 * code will ensure that the resource is freed. 1441 */ 1442void devm_regulator_put(struct regulator *regulator) 1443{ 1444 int rc; 1445 1446 rc = devres_destroy(regulator->dev, devm_regulator_release, 1447 devm_regulator_match, regulator); 1448 WARN_ON(rc); 1449} 1450EXPORT_SYMBOL_GPL(devm_regulator_put); 1451 1452static int _regulator_can_change_status(struct regulator_dev *rdev) 1453{ 1454 if (!rdev->constraints) 1455 return 0; 1456 1457 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1458 return 1; 1459 else 1460 return 0; 1461} 1462 1463/* locks held by regulator_enable() */ 1464static int _regulator_enable(struct regulator_dev *rdev) 1465{ 1466 int ret, delay; 1467 1468 /* check voltage and requested load before enabling */ 1469 if (rdev->constraints && 1470 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1471 drms_uA_update(rdev); 1472 1473 if (rdev->use_count == 0) { 1474 /* The regulator may on if it's not switchable or left on */ 1475 ret = _regulator_is_enabled(rdev); 1476 if (ret == -EINVAL || ret == 0) { 1477 if (!_regulator_can_change_status(rdev)) 1478 return -EPERM; 1479 1480 if (!rdev->desc->ops->enable) 1481 return -EINVAL; 1482 1483 /* Query before enabling in case configuration 1484 * dependent. */ 1485 ret = _regulator_get_enable_time(rdev); 1486 if (ret >= 0) { 1487 delay = ret; 1488 } else { 1489 rdev_warn(rdev, "enable_time() failed: %d\n", 1490 ret); 1491 delay = 0; 1492 } 1493 1494 trace_regulator_enable(rdev_get_name(rdev)); 1495 1496 /* Allow the regulator to ramp; it would be useful 1497 * to extend this for bulk operations so that the 1498 * regulators can ramp together. */ 1499 ret = rdev->desc->ops->enable(rdev); 1500 if (ret < 0) 1501 return ret; 1502 1503 trace_regulator_enable_delay(rdev_get_name(rdev)); 1504 1505 if (delay >= 1000) { 1506 mdelay(delay / 1000); 1507 udelay(delay % 1000); 1508 } else if (delay) { 1509 udelay(delay); 1510 } 1511 1512 trace_regulator_enable_complete(rdev_get_name(rdev)); 1513 1514 } else if (ret < 0) { 1515 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1516 return ret; 1517 } 1518 /* Fallthrough on positive return values - already enabled */ 1519 } 1520 1521 rdev->use_count++; 1522 1523 return 0; 1524} 1525 1526/** 1527 * regulator_enable - enable regulator output 1528 * @regulator: regulator source 1529 * 1530 * Request that the regulator be enabled with the regulator output at 1531 * the predefined voltage or current value. Calls to regulator_enable() 1532 * must be balanced with calls to regulator_disable(). 1533 * 1534 * NOTE: the output value can be set by other drivers, boot loader or may be 1535 * hardwired in the regulator. 1536 */ 1537int regulator_enable(struct regulator *regulator) 1538{ 1539 struct regulator_dev *rdev = regulator->rdev; 1540 int ret = 0; 1541 1542 if (rdev->supply) { 1543 ret = regulator_enable(rdev->supply); 1544 if (ret != 0) 1545 return ret; 1546 } 1547 1548 mutex_lock(&rdev->mutex); 1549 ret = _regulator_enable(rdev); 1550 mutex_unlock(&rdev->mutex); 1551 1552 if (ret != 0 && rdev->supply) 1553 regulator_disable(rdev->supply); 1554 1555 return ret; 1556} 1557EXPORT_SYMBOL_GPL(regulator_enable); 1558 1559/* locks held by regulator_disable() */ 1560static int _regulator_disable(struct regulator_dev *rdev) 1561{ 1562 int ret = 0; 1563 1564 if (WARN(rdev->use_count <= 0, 1565 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1566 return -EIO; 1567 1568 /* are we the last user and permitted to disable ? */ 1569 if (rdev->use_count == 1 && 1570 (rdev->constraints && !rdev->constraints->always_on)) { 1571 1572 /* we are last user */ 1573 if (_regulator_can_change_status(rdev) && 1574 rdev->desc->ops->disable) { 1575 trace_regulator_disable(rdev_get_name(rdev)); 1576 1577 ret = rdev->desc->ops->disable(rdev); 1578 if (ret < 0) { 1579 rdev_err(rdev, "failed to disable\n"); 1580 return ret; 1581 } 1582 1583 trace_regulator_disable_complete(rdev_get_name(rdev)); 1584 1585 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1586 NULL); 1587 } 1588 1589 rdev->use_count = 0; 1590 } else if (rdev->use_count > 1) { 1591 1592 if (rdev->constraints && 1593 (rdev->constraints->valid_ops_mask & 1594 REGULATOR_CHANGE_DRMS)) 1595 drms_uA_update(rdev); 1596 1597 rdev->use_count--; 1598 } 1599 1600 return ret; 1601} 1602 1603/** 1604 * regulator_disable - disable regulator output 1605 * @regulator: regulator source 1606 * 1607 * Disable the regulator output voltage or current. Calls to 1608 * regulator_enable() must be balanced with calls to 1609 * regulator_disable(). 1610 * 1611 * NOTE: this will only disable the regulator output if no other consumer 1612 * devices have it enabled, the regulator device supports disabling and 1613 * machine constraints permit this operation. 1614 */ 1615int regulator_disable(struct regulator *regulator) 1616{ 1617 struct regulator_dev *rdev = regulator->rdev; 1618 int ret = 0; 1619 1620 mutex_lock(&rdev->mutex); 1621 ret = _regulator_disable(rdev); 1622 mutex_unlock(&rdev->mutex); 1623 1624 if (ret == 0 && rdev->supply) 1625 regulator_disable(rdev->supply); 1626 1627 return ret; 1628} 1629EXPORT_SYMBOL_GPL(regulator_disable); 1630 1631/* locks held by regulator_force_disable() */ 1632static int _regulator_force_disable(struct regulator_dev *rdev) 1633{ 1634 int ret = 0; 1635 1636 /* force disable */ 1637 if (rdev->desc->ops->disable) { 1638 /* ah well, who wants to live forever... */ 1639 ret = rdev->desc->ops->disable(rdev); 1640 if (ret < 0) { 1641 rdev_err(rdev, "failed to force disable\n"); 1642 return ret; 1643 } 1644 /* notify other consumers that power has been forced off */ 1645 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1646 REGULATOR_EVENT_DISABLE, NULL); 1647 } 1648 1649 return ret; 1650} 1651 1652/** 1653 * regulator_force_disable - force disable regulator output 1654 * @regulator: regulator source 1655 * 1656 * Forcibly disable the regulator output voltage or current. 1657 * NOTE: this *will* disable the regulator output even if other consumer 1658 * devices have it enabled. This should be used for situations when device 1659 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1660 */ 1661int regulator_force_disable(struct regulator *regulator) 1662{ 1663 struct regulator_dev *rdev = regulator->rdev; 1664 int ret; 1665 1666 mutex_lock(&rdev->mutex); 1667 regulator->uA_load = 0; 1668 ret = _regulator_force_disable(regulator->rdev); 1669 mutex_unlock(&rdev->mutex); 1670 1671 if (rdev->supply) 1672 while (rdev->open_count--) 1673 regulator_disable(rdev->supply); 1674 1675 return ret; 1676} 1677EXPORT_SYMBOL_GPL(regulator_force_disable); 1678 1679static void regulator_disable_work(struct work_struct *work) 1680{ 1681 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1682 disable_work.work); 1683 int count, i, ret; 1684 1685 mutex_lock(&rdev->mutex); 1686 1687 BUG_ON(!rdev->deferred_disables); 1688 1689 count = rdev->deferred_disables; 1690 rdev->deferred_disables = 0; 1691 1692 for (i = 0; i < count; i++) { 1693 ret = _regulator_disable(rdev); 1694 if (ret != 0) 1695 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1696 } 1697 1698 mutex_unlock(&rdev->mutex); 1699 1700 if (rdev->supply) { 1701 for (i = 0; i < count; i++) { 1702 ret = regulator_disable(rdev->supply); 1703 if (ret != 0) { 1704 rdev_err(rdev, 1705 "Supply disable failed: %d\n", ret); 1706 } 1707 } 1708 } 1709} 1710 1711/** 1712 * regulator_disable_deferred - disable regulator output with delay 1713 * @regulator: regulator source 1714 * @ms: miliseconds until the regulator is disabled 1715 * 1716 * Execute regulator_disable() on the regulator after a delay. This 1717 * is intended for use with devices that require some time to quiesce. 1718 * 1719 * NOTE: this will only disable the regulator output if no other consumer 1720 * devices have it enabled, the regulator device supports disabling and 1721 * machine constraints permit this operation. 1722 */ 1723int regulator_disable_deferred(struct regulator *regulator, int ms) 1724{ 1725 struct regulator_dev *rdev = regulator->rdev; 1726 int ret; 1727 1728 mutex_lock(&rdev->mutex); 1729 rdev->deferred_disables++; 1730 mutex_unlock(&rdev->mutex); 1731 1732 ret = schedule_delayed_work(&rdev->disable_work, 1733 msecs_to_jiffies(ms)); 1734 if (ret < 0) 1735 return ret; 1736 else 1737 return 0; 1738} 1739EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1740 1741static int _regulator_is_enabled(struct regulator_dev *rdev) 1742{ 1743 /* If we don't know then assume that the regulator is always on */ 1744 if (!rdev->desc->ops->is_enabled) 1745 return 1; 1746 1747 return rdev->desc->ops->is_enabled(rdev); 1748} 1749 1750/** 1751 * regulator_is_enabled - is the regulator output enabled 1752 * @regulator: regulator source 1753 * 1754 * Returns positive if the regulator driver backing the source/client 1755 * has requested that the device be enabled, zero if it hasn't, else a 1756 * negative errno code. 1757 * 1758 * Note that the device backing this regulator handle can have multiple 1759 * users, so it might be enabled even if regulator_enable() was never 1760 * called for this particular source. 1761 */ 1762int regulator_is_enabled(struct regulator *regulator) 1763{ 1764 int ret; 1765 1766 mutex_lock(®ulator->rdev->mutex); 1767 ret = _regulator_is_enabled(regulator->rdev); 1768 mutex_unlock(®ulator->rdev->mutex); 1769 1770 return ret; 1771} 1772EXPORT_SYMBOL_GPL(regulator_is_enabled); 1773 1774/** 1775 * regulator_count_voltages - count regulator_list_voltage() selectors 1776 * @regulator: regulator source 1777 * 1778 * Returns number of selectors, or negative errno. Selectors are 1779 * numbered starting at zero, and typically correspond to bitfields 1780 * in hardware registers. 1781 */ 1782int regulator_count_voltages(struct regulator *regulator) 1783{ 1784 struct regulator_dev *rdev = regulator->rdev; 1785 1786 return rdev->desc->n_voltages ? : -EINVAL; 1787} 1788EXPORT_SYMBOL_GPL(regulator_count_voltages); 1789 1790/** 1791 * regulator_list_voltage - enumerate supported voltages 1792 * @regulator: regulator source 1793 * @selector: identify voltage to list 1794 * Context: can sleep 1795 * 1796 * Returns a voltage that can be passed to @regulator_set_voltage(), 1797 * zero if this selector code can't be used on this system, or a 1798 * negative errno. 1799 */ 1800int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1801{ 1802 struct regulator_dev *rdev = regulator->rdev; 1803 struct regulator_ops *ops = rdev->desc->ops; 1804 int ret; 1805 1806 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1807 return -EINVAL; 1808 1809 mutex_lock(&rdev->mutex); 1810 ret = ops->list_voltage(rdev, selector); 1811 mutex_unlock(&rdev->mutex); 1812 1813 if (ret > 0) { 1814 if (ret < rdev->constraints->min_uV) 1815 ret = 0; 1816 else if (ret > rdev->constraints->max_uV) 1817 ret = 0; 1818 } 1819 1820 return ret; 1821} 1822EXPORT_SYMBOL_GPL(regulator_list_voltage); 1823 1824/** 1825 * regulator_is_supported_voltage - check if a voltage range can be supported 1826 * 1827 * @regulator: Regulator to check. 1828 * @min_uV: Minimum required voltage in uV. 1829 * @max_uV: Maximum required voltage in uV. 1830 * 1831 * Returns a boolean or a negative error code. 1832 */ 1833int regulator_is_supported_voltage(struct regulator *regulator, 1834 int min_uV, int max_uV) 1835{ 1836 int i, voltages, ret; 1837 1838 ret = regulator_count_voltages(regulator); 1839 if (ret < 0) 1840 return ret; 1841 voltages = ret; 1842 1843 for (i = 0; i < voltages; i++) { 1844 ret = regulator_list_voltage(regulator, i); 1845 1846 if (ret >= min_uV && ret <= max_uV) 1847 return 1; 1848 } 1849 1850 return 0; 1851} 1852EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1853 1854static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1855 int min_uV, int max_uV) 1856{ 1857 int ret; 1858 int delay = 0; 1859 unsigned int selector; 1860 1861 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1862 1863 min_uV += rdev->constraints->uV_offset; 1864 max_uV += rdev->constraints->uV_offset; 1865 1866 if (rdev->desc->ops->set_voltage) { 1867 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1868 &selector); 1869 1870 if (rdev->desc->ops->list_voltage) 1871 selector = rdev->desc->ops->list_voltage(rdev, 1872 selector); 1873 else 1874 selector = -1; 1875 } else if (rdev->desc->ops->set_voltage_sel) { 1876 int best_val = INT_MAX; 1877 int i; 1878 1879 selector = 0; 1880 1881 /* Find the smallest voltage that falls within the specified 1882 * range. 1883 */ 1884 for (i = 0; i < rdev->desc->n_voltages; i++) { 1885 ret = rdev->desc->ops->list_voltage(rdev, i); 1886 if (ret < 0) 1887 continue; 1888 1889 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1890 best_val = ret; 1891 selector = i; 1892 } 1893 } 1894 1895 /* 1896 * If we can't obtain the old selector there is not enough 1897 * info to call set_voltage_time_sel(). 1898 */ 1899 if (rdev->desc->ops->set_voltage_time_sel && 1900 rdev->desc->ops->get_voltage_sel) { 1901 unsigned int old_selector = 0; 1902 1903 ret = rdev->desc->ops->get_voltage_sel(rdev); 1904 if (ret < 0) 1905 return ret; 1906 old_selector = ret; 1907 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1908 old_selector, selector); 1909 } 1910 1911 if (best_val != INT_MAX) { 1912 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1913 selector = best_val; 1914 } else { 1915 ret = -EINVAL; 1916 } 1917 } else { 1918 ret = -EINVAL; 1919 } 1920 1921 /* Insert any necessary delays */ 1922 if (delay >= 1000) { 1923 mdelay(delay / 1000); 1924 udelay(delay % 1000); 1925 } else if (delay) { 1926 udelay(delay); 1927 } 1928 1929 if (ret == 0) 1930 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1931 NULL); 1932 1933 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1934 1935 return ret; 1936} 1937 1938/** 1939 * regulator_set_voltage - set regulator output voltage 1940 * @regulator: regulator source 1941 * @min_uV: Minimum required voltage in uV 1942 * @max_uV: Maximum acceptable voltage in uV 1943 * 1944 * Sets a voltage regulator to the desired output voltage. This can be set 1945 * during any regulator state. IOW, regulator can be disabled or enabled. 1946 * 1947 * If the regulator is enabled then the voltage will change to the new value 1948 * immediately otherwise if the regulator is disabled the regulator will 1949 * output at the new voltage when enabled. 1950 * 1951 * NOTE: If the regulator is shared between several devices then the lowest 1952 * request voltage that meets the system constraints will be used. 1953 * Regulator system constraints must be set for this regulator before 1954 * calling this function otherwise this call will fail. 1955 */ 1956int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1957{ 1958 struct regulator_dev *rdev = regulator->rdev; 1959 int ret = 0; 1960 1961 mutex_lock(&rdev->mutex); 1962 1963 /* If we're setting the same range as last time the change 1964 * should be a noop (some cpufreq implementations use the same 1965 * voltage for multiple frequencies, for example). 1966 */ 1967 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1968 goto out; 1969 1970 /* sanity check */ 1971 if (!rdev->desc->ops->set_voltage && 1972 !rdev->desc->ops->set_voltage_sel) { 1973 ret = -EINVAL; 1974 goto out; 1975 } 1976 1977 /* constraints check */ 1978 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1979 if (ret < 0) 1980 goto out; 1981 regulator->min_uV = min_uV; 1982 regulator->max_uV = max_uV; 1983 1984 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1985 if (ret < 0) 1986 goto out; 1987 1988 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1989 1990out: 1991 mutex_unlock(&rdev->mutex); 1992 return ret; 1993} 1994EXPORT_SYMBOL_GPL(regulator_set_voltage); 1995 1996/** 1997 * regulator_set_voltage_time - get raise/fall time 1998 * @regulator: regulator source 1999 * @old_uV: starting voltage in microvolts 2000 * @new_uV: target voltage in microvolts 2001 * 2002 * Provided with the starting and ending voltage, this function attempts to 2003 * calculate the time in microseconds required to rise or fall to this new 2004 * voltage. 2005 */ 2006int regulator_set_voltage_time(struct regulator *regulator, 2007 int old_uV, int new_uV) 2008{ 2009 struct regulator_dev *rdev = regulator->rdev; 2010 struct regulator_ops *ops = rdev->desc->ops; 2011 int old_sel = -1; 2012 int new_sel = -1; 2013 int voltage; 2014 int i; 2015 2016 /* Currently requires operations to do this */ 2017 if (!ops->list_voltage || !ops->set_voltage_time_sel 2018 || !rdev->desc->n_voltages) 2019 return -EINVAL; 2020 2021 for (i = 0; i < rdev->desc->n_voltages; i++) { 2022 /* We only look for exact voltage matches here */ 2023 voltage = regulator_list_voltage(regulator, i); 2024 if (voltage < 0) 2025 return -EINVAL; 2026 if (voltage == 0) 2027 continue; 2028 if (voltage == old_uV) 2029 old_sel = i; 2030 if (voltage == new_uV) 2031 new_sel = i; 2032 } 2033 2034 if (old_sel < 0 || new_sel < 0) 2035 return -EINVAL; 2036 2037 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2038} 2039EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2040 2041/** 2042 * regulator_sync_voltage - re-apply last regulator output voltage 2043 * @regulator: regulator source 2044 * 2045 * Re-apply the last configured voltage. This is intended to be used 2046 * where some external control source the consumer is cooperating with 2047 * has caused the configured voltage to change. 2048 */ 2049int regulator_sync_voltage(struct regulator *regulator) 2050{ 2051 struct regulator_dev *rdev = regulator->rdev; 2052 int ret, min_uV, max_uV; 2053 2054 mutex_lock(&rdev->mutex); 2055 2056 if (!rdev->desc->ops->set_voltage && 2057 !rdev->desc->ops->set_voltage_sel) { 2058 ret = -EINVAL; 2059 goto out; 2060 } 2061 2062 /* This is only going to work if we've had a voltage configured. */ 2063 if (!regulator->min_uV && !regulator->max_uV) { 2064 ret = -EINVAL; 2065 goto out; 2066 } 2067 2068 min_uV = regulator->min_uV; 2069 max_uV = regulator->max_uV; 2070 2071 /* This should be a paranoia check... */ 2072 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2073 if (ret < 0) 2074 goto out; 2075 2076 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2077 if (ret < 0) 2078 goto out; 2079 2080 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2081 2082out: 2083 mutex_unlock(&rdev->mutex); 2084 return ret; 2085} 2086EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2087 2088static int _regulator_get_voltage(struct regulator_dev *rdev) 2089{ 2090 int sel, ret; 2091 2092 if (rdev->desc->ops->get_voltage_sel) { 2093 sel = rdev->desc->ops->get_voltage_sel(rdev); 2094 if (sel < 0) 2095 return sel; 2096 ret = rdev->desc->ops->list_voltage(rdev, sel); 2097 } else if (rdev->desc->ops->get_voltage) { 2098 ret = rdev->desc->ops->get_voltage(rdev); 2099 } else { 2100 return -EINVAL; 2101 } 2102 2103 if (ret < 0) 2104 return ret; 2105 return ret - rdev->constraints->uV_offset; 2106} 2107 2108/** 2109 * regulator_get_voltage - get regulator output voltage 2110 * @regulator: regulator source 2111 * 2112 * This returns the current regulator voltage in uV. 2113 * 2114 * NOTE: If the regulator is disabled it will return the voltage value. This 2115 * function should not be used to determine regulator state. 2116 */ 2117int regulator_get_voltage(struct regulator *regulator) 2118{ 2119 int ret; 2120 2121 mutex_lock(®ulator->rdev->mutex); 2122 2123 ret = _regulator_get_voltage(regulator->rdev); 2124 2125 mutex_unlock(®ulator->rdev->mutex); 2126 2127 return ret; 2128} 2129EXPORT_SYMBOL_GPL(regulator_get_voltage); 2130 2131/** 2132 * regulator_set_current_limit - set regulator output current limit 2133 * @regulator: regulator source 2134 * @min_uA: Minimuum supported current in uA 2135 * @max_uA: Maximum supported current in uA 2136 * 2137 * Sets current sink to the desired output current. This can be set during 2138 * any regulator state. IOW, regulator can be disabled or enabled. 2139 * 2140 * If the regulator is enabled then the current will change to the new value 2141 * immediately otherwise if the regulator is disabled the regulator will 2142 * output at the new current when enabled. 2143 * 2144 * NOTE: Regulator system constraints must be set for this regulator before 2145 * calling this function otherwise this call will fail. 2146 */ 2147int regulator_set_current_limit(struct regulator *regulator, 2148 int min_uA, int max_uA) 2149{ 2150 struct regulator_dev *rdev = regulator->rdev; 2151 int ret; 2152 2153 mutex_lock(&rdev->mutex); 2154 2155 /* sanity check */ 2156 if (!rdev->desc->ops->set_current_limit) { 2157 ret = -EINVAL; 2158 goto out; 2159 } 2160 2161 /* constraints check */ 2162 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2163 if (ret < 0) 2164 goto out; 2165 2166 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2167out: 2168 mutex_unlock(&rdev->mutex); 2169 return ret; 2170} 2171EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2172 2173static int _regulator_get_current_limit(struct regulator_dev *rdev) 2174{ 2175 int ret; 2176 2177 mutex_lock(&rdev->mutex); 2178 2179 /* sanity check */ 2180 if (!rdev->desc->ops->get_current_limit) { 2181 ret = -EINVAL; 2182 goto out; 2183 } 2184 2185 ret = rdev->desc->ops->get_current_limit(rdev); 2186out: 2187 mutex_unlock(&rdev->mutex); 2188 return ret; 2189} 2190 2191/** 2192 * regulator_get_current_limit - get regulator output current 2193 * @regulator: regulator source 2194 * 2195 * This returns the current supplied by the specified current sink in uA. 2196 * 2197 * NOTE: If the regulator is disabled it will return the current value. This 2198 * function should not be used to determine regulator state. 2199 */ 2200int regulator_get_current_limit(struct regulator *regulator) 2201{ 2202 return _regulator_get_current_limit(regulator->rdev); 2203} 2204EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2205 2206/** 2207 * regulator_set_mode - set regulator operating mode 2208 * @regulator: regulator source 2209 * @mode: operating mode - one of the REGULATOR_MODE constants 2210 * 2211 * Set regulator operating mode to increase regulator efficiency or improve 2212 * regulation performance. 2213 * 2214 * NOTE: Regulator system constraints must be set for this regulator before 2215 * calling this function otherwise this call will fail. 2216 */ 2217int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2218{ 2219 struct regulator_dev *rdev = regulator->rdev; 2220 int ret; 2221 int regulator_curr_mode; 2222 2223 mutex_lock(&rdev->mutex); 2224 2225 /* sanity check */ 2226 if (!rdev->desc->ops->set_mode) { 2227 ret = -EINVAL; 2228 goto out; 2229 } 2230 2231 /* return if the same mode is requested */ 2232 if (rdev->desc->ops->get_mode) { 2233 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2234 if (regulator_curr_mode == mode) { 2235 ret = 0; 2236 goto out; 2237 } 2238 } 2239 2240 /* constraints check */ 2241 ret = regulator_mode_constrain(rdev, &mode); 2242 if (ret < 0) 2243 goto out; 2244 2245 ret = rdev->desc->ops->set_mode(rdev, mode); 2246out: 2247 mutex_unlock(&rdev->mutex); 2248 return ret; 2249} 2250EXPORT_SYMBOL_GPL(regulator_set_mode); 2251 2252static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2253{ 2254 int ret; 2255 2256 mutex_lock(&rdev->mutex); 2257 2258 /* sanity check */ 2259 if (!rdev->desc->ops->get_mode) { 2260 ret = -EINVAL; 2261 goto out; 2262 } 2263 2264 ret = rdev->desc->ops->get_mode(rdev); 2265out: 2266 mutex_unlock(&rdev->mutex); 2267 return ret; 2268} 2269 2270/** 2271 * regulator_get_mode - get regulator operating mode 2272 * @regulator: regulator source 2273 * 2274 * Get the current regulator operating mode. 2275 */ 2276unsigned int regulator_get_mode(struct regulator *regulator) 2277{ 2278 return _regulator_get_mode(regulator->rdev); 2279} 2280EXPORT_SYMBOL_GPL(regulator_get_mode); 2281 2282/** 2283 * regulator_set_optimum_mode - set regulator optimum operating mode 2284 * @regulator: regulator source 2285 * @uA_load: load current 2286 * 2287 * Notifies the regulator core of a new device load. This is then used by 2288 * DRMS (if enabled by constraints) to set the most efficient regulator 2289 * operating mode for the new regulator loading. 2290 * 2291 * Consumer devices notify their supply regulator of the maximum power 2292 * they will require (can be taken from device datasheet in the power 2293 * consumption tables) when they change operational status and hence power 2294 * state. Examples of operational state changes that can affect power 2295 * consumption are :- 2296 * 2297 * o Device is opened / closed. 2298 * o Device I/O is about to begin or has just finished. 2299 * o Device is idling in between work. 2300 * 2301 * This information is also exported via sysfs to userspace. 2302 * 2303 * DRMS will sum the total requested load on the regulator and change 2304 * to the most efficient operating mode if platform constraints allow. 2305 * 2306 * Returns the new regulator mode or error. 2307 */ 2308int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2309{ 2310 struct regulator_dev *rdev = regulator->rdev; 2311 struct regulator *consumer; 2312 int ret, output_uV, input_uV, total_uA_load = 0; 2313 unsigned int mode; 2314 2315 mutex_lock(&rdev->mutex); 2316 2317 /* 2318 * first check to see if we can set modes at all, otherwise just 2319 * tell the consumer everything is OK. 2320 */ 2321 regulator->uA_load = uA_load; 2322 ret = regulator_check_drms(rdev); 2323 if (ret < 0) { 2324 ret = 0; 2325 goto out; 2326 } 2327 2328 if (!rdev->desc->ops->get_optimum_mode) 2329 goto out; 2330 2331 /* 2332 * we can actually do this so any errors are indicators of 2333 * potential real failure. 2334 */ 2335 ret = -EINVAL; 2336 2337 /* get output voltage */ 2338 output_uV = _regulator_get_voltage(rdev); 2339 if (output_uV <= 0) { 2340 rdev_err(rdev, "invalid output voltage found\n"); 2341 goto out; 2342 } 2343 2344 /* get input voltage */ 2345 input_uV = 0; 2346 if (rdev->supply) 2347 input_uV = regulator_get_voltage(rdev->supply); 2348 if (input_uV <= 0) 2349 input_uV = rdev->constraints->input_uV; 2350 if (input_uV <= 0) { 2351 rdev_err(rdev, "invalid input voltage found\n"); 2352 goto out; 2353 } 2354 2355 /* calc total requested load for this regulator */ 2356 list_for_each_entry(consumer, &rdev->consumer_list, list) 2357 total_uA_load += consumer->uA_load; 2358 2359 mode = rdev->desc->ops->get_optimum_mode(rdev, 2360 input_uV, output_uV, 2361 total_uA_load); 2362 ret = regulator_mode_constrain(rdev, &mode); 2363 if (ret < 0) { 2364 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2365 total_uA_load, input_uV, output_uV); 2366 goto out; 2367 } 2368 2369 ret = rdev->desc->ops->set_mode(rdev, mode); 2370 if (ret < 0) { 2371 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2372 goto out; 2373 } 2374 ret = mode; 2375out: 2376 mutex_unlock(&rdev->mutex); 2377 return ret; 2378} 2379EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2380 2381/** 2382 * regulator_register_notifier - register regulator event notifier 2383 * @regulator: regulator source 2384 * @nb: notifier block 2385 * 2386 * Register notifier block to receive regulator events. 2387 */ 2388int regulator_register_notifier(struct regulator *regulator, 2389 struct notifier_block *nb) 2390{ 2391 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2392 nb); 2393} 2394EXPORT_SYMBOL_GPL(regulator_register_notifier); 2395 2396/** 2397 * regulator_unregister_notifier - unregister regulator event notifier 2398 * @regulator: regulator source 2399 * @nb: notifier block 2400 * 2401 * Unregister regulator event notifier block. 2402 */ 2403int regulator_unregister_notifier(struct regulator *regulator, 2404 struct notifier_block *nb) 2405{ 2406 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2407 nb); 2408} 2409EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2410 2411/* notify regulator consumers and downstream regulator consumers. 2412 * Note mutex must be held by caller. 2413 */ 2414static void _notifier_call_chain(struct regulator_dev *rdev, 2415 unsigned long event, void *data) 2416{ 2417 /* call rdev chain first */ 2418 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2419} 2420 2421/** 2422 * regulator_bulk_get - get multiple regulator consumers 2423 * 2424 * @dev: Device to supply 2425 * @num_consumers: Number of consumers to register 2426 * @consumers: Configuration of consumers; clients are stored here. 2427 * 2428 * @return 0 on success, an errno on failure. 2429 * 2430 * This helper function allows drivers to get several regulator 2431 * consumers in one operation. If any of the regulators cannot be 2432 * acquired then any regulators that were allocated will be freed 2433 * before returning to the caller. 2434 */ 2435int regulator_bulk_get(struct device *dev, int num_consumers, 2436 struct regulator_bulk_data *consumers) 2437{ 2438 int i; 2439 int ret; 2440 2441 for (i = 0; i < num_consumers; i++) 2442 consumers[i].consumer = NULL; 2443 2444 for (i = 0; i < num_consumers; i++) { 2445 consumers[i].consumer = regulator_get(dev, 2446 consumers[i].supply); 2447 if (IS_ERR(consumers[i].consumer)) { 2448 ret = PTR_ERR(consumers[i].consumer); 2449 dev_err(dev, "Failed to get supply '%s': %d\n", 2450 consumers[i].supply, ret); 2451 consumers[i].consumer = NULL; 2452 goto err; 2453 } 2454 } 2455 2456 return 0; 2457 2458err: 2459 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2460 regulator_put(consumers[i].consumer); 2461 2462 return ret; 2463} 2464EXPORT_SYMBOL_GPL(regulator_bulk_get); 2465 2466/** 2467 * devm_regulator_bulk_get - managed get multiple regulator consumers 2468 * 2469 * @dev: Device to supply 2470 * @num_consumers: Number of consumers to register 2471 * @consumers: Configuration of consumers; clients are stored here. 2472 * 2473 * @return 0 on success, an errno on failure. 2474 * 2475 * This helper function allows drivers to get several regulator 2476 * consumers in one operation with management, the regulators will 2477 * automatically be freed when the device is unbound. If any of the 2478 * regulators cannot be acquired then any regulators that were 2479 * allocated will be freed before returning to the caller. 2480 */ 2481int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2482 struct regulator_bulk_data *consumers) 2483{ 2484 int i; 2485 int ret; 2486 2487 for (i = 0; i < num_consumers; i++) 2488 consumers[i].consumer = NULL; 2489 2490 for (i = 0; i < num_consumers; i++) { 2491 consumers[i].consumer = devm_regulator_get(dev, 2492 consumers[i].supply); 2493 if (IS_ERR(consumers[i].consumer)) { 2494 ret = PTR_ERR(consumers[i].consumer); 2495 dev_err(dev, "Failed to get supply '%s': %d\n", 2496 consumers[i].supply, ret); 2497 consumers[i].consumer = NULL; 2498 goto err; 2499 } 2500 } 2501 2502 return 0; 2503 2504err: 2505 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2506 devm_regulator_put(consumers[i].consumer); 2507 2508 return ret; 2509} 2510EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2511 2512static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2513{ 2514 struct regulator_bulk_data *bulk = data; 2515 2516 bulk->ret = regulator_enable(bulk->consumer); 2517} 2518 2519/** 2520 * regulator_bulk_enable - enable multiple regulator consumers 2521 * 2522 * @num_consumers: Number of consumers 2523 * @consumers: Consumer data; clients are stored here. 2524 * @return 0 on success, an errno on failure 2525 * 2526 * This convenience API allows consumers to enable multiple regulator 2527 * clients in a single API call. If any consumers cannot be enabled 2528 * then any others that were enabled will be disabled again prior to 2529 * return. 2530 */ 2531int regulator_bulk_enable(int num_consumers, 2532 struct regulator_bulk_data *consumers) 2533{ 2534 LIST_HEAD(async_domain); 2535 int i; 2536 int ret = 0; 2537 2538 for (i = 0; i < num_consumers; i++) 2539 async_schedule_domain(regulator_bulk_enable_async, 2540 &consumers[i], &async_domain); 2541 2542 async_synchronize_full_domain(&async_domain); 2543 2544 /* If any consumer failed we need to unwind any that succeeded */ 2545 for (i = 0; i < num_consumers; i++) { 2546 if (consumers[i].ret != 0) { 2547 ret = consumers[i].ret; 2548 goto err; 2549 } 2550 } 2551 2552 return 0; 2553 2554err: 2555 for (i = 0; i < num_consumers; i++) 2556 if (consumers[i].ret == 0) 2557 regulator_disable(consumers[i].consumer); 2558 else 2559 pr_err("Failed to enable %s: %d\n", 2560 consumers[i].supply, consumers[i].ret); 2561 2562 return ret; 2563} 2564EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2565 2566/** 2567 * regulator_bulk_disable - disable multiple regulator consumers 2568 * 2569 * @num_consumers: Number of consumers 2570 * @consumers: Consumer data; clients are stored here. 2571 * @return 0 on success, an errno on failure 2572 * 2573 * This convenience API allows consumers to disable multiple regulator 2574 * clients in a single API call. If any consumers cannot be enabled 2575 * then any others that were disabled will be disabled again prior to 2576 * return. 2577 */ 2578int regulator_bulk_disable(int num_consumers, 2579 struct regulator_bulk_data *consumers) 2580{ 2581 int i; 2582 int ret; 2583 2584 for (i = 0; i < num_consumers; i++) { 2585 ret = regulator_disable(consumers[i].consumer); 2586 if (ret != 0) 2587 goto err; 2588 } 2589 2590 return 0; 2591 2592err: 2593 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2594 for (--i; i >= 0; --i) 2595 regulator_enable(consumers[i].consumer); 2596 2597 return ret; 2598} 2599EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2600 2601/** 2602 * regulator_bulk_force_disable - force disable multiple regulator consumers 2603 * 2604 * @num_consumers: Number of consumers 2605 * @consumers: Consumer data; clients are stored here. 2606 * @return 0 on success, an errno on failure 2607 * 2608 * This convenience API allows consumers to forcibly disable multiple regulator 2609 * clients in a single API call. 2610 * NOTE: This should be used for situations when device damage will 2611 * likely occur if the regulators are not disabled (e.g. over temp). 2612 * Although regulator_force_disable function call for some consumers can 2613 * return error numbers, the function is called for all consumers. 2614 */ 2615int regulator_bulk_force_disable(int num_consumers, 2616 struct regulator_bulk_data *consumers) 2617{ 2618 int i; 2619 int ret; 2620 2621 for (i = 0; i < num_consumers; i++) 2622 consumers[i].ret = 2623 regulator_force_disable(consumers[i].consumer); 2624 2625 for (i = 0; i < num_consumers; i++) { 2626 if (consumers[i].ret != 0) { 2627 ret = consumers[i].ret; 2628 goto out; 2629 } 2630 } 2631 2632 return 0; 2633out: 2634 return ret; 2635} 2636EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2637 2638/** 2639 * regulator_bulk_free - free multiple regulator consumers 2640 * 2641 * @num_consumers: Number of consumers 2642 * @consumers: Consumer data; clients are stored here. 2643 * 2644 * This convenience API allows consumers to free multiple regulator 2645 * clients in a single API call. 2646 */ 2647void regulator_bulk_free(int num_consumers, 2648 struct regulator_bulk_data *consumers) 2649{ 2650 int i; 2651 2652 for (i = 0; i < num_consumers; i++) { 2653 regulator_put(consumers[i].consumer); 2654 consumers[i].consumer = NULL; 2655 } 2656} 2657EXPORT_SYMBOL_GPL(regulator_bulk_free); 2658 2659/** 2660 * regulator_notifier_call_chain - call regulator event notifier 2661 * @rdev: regulator source 2662 * @event: notifier block 2663 * @data: callback-specific data. 2664 * 2665 * Called by regulator drivers to notify clients a regulator event has 2666 * occurred. We also notify regulator clients downstream. 2667 * Note lock must be held by caller. 2668 */ 2669int regulator_notifier_call_chain(struct regulator_dev *rdev, 2670 unsigned long event, void *data) 2671{ 2672 _notifier_call_chain(rdev, event, data); 2673 return NOTIFY_DONE; 2674 2675} 2676EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2677 2678/** 2679 * regulator_mode_to_status - convert a regulator mode into a status 2680 * 2681 * @mode: Mode to convert 2682 * 2683 * Convert a regulator mode into a status. 2684 */ 2685int regulator_mode_to_status(unsigned int mode) 2686{ 2687 switch (mode) { 2688 case REGULATOR_MODE_FAST: 2689 return REGULATOR_STATUS_FAST; 2690 case REGULATOR_MODE_NORMAL: 2691 return REGULATOR_STATUS_NORMAL; 2692 case REGULATOR_MODE_IDLE: 2693 return REGULATOR_STATUS_IDLE; 2694 case REGULATOR_STATUS_STANDBY: 2695 return REGULATOR_STATUS_STANDBY; 2696 default: 2697 return 0; 2698 } 2699} 2700EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2701 2702/* 2703 * To avoid cluttering sysfs (and memory) with useless state, only 2704 * create attributes that can be meaningfully displayed. 2705 */ 2706static int add_regulator_attributes(struct regulator_dev *rdev) 2707{ 2708 struct device *dev = &rdev->dev; 2709 struct regulator_ops *ops = rdev->desc->ops; 2710 int status = 0; 2711 2712 /* some attributes need specific methods to be displayed */ 2713 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2714 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2715 status = device_create_file(dev, &dev_attr_microvolts); 2716 if (status < 0) 2717 return status; 2718 } 2719 if (ops->get_current_limit) { 2720 status = device_create_file(dev, &dev_attr_microamps); 2721 if (status < 0) 2722 return status; 2723 } 2724 if (ops->get_mode) { 2725 status = device_create_file(dev, &dev_attr_opmode); 2726 if (status < 0) 2727 return status; 2728 } 2729 if (ops->is_enabled) { 2730 status = device_create_file(dev, &dev_attr_state); 2731 if (status < 0) 2732 return status; 2733 } 2734 if (ops->get_status) { 2735 status = device_create_file(dev, &dev_attr_status); 2736 if (status < 0) 2737 return status; 2738 } 2739 2740 /* some attributes are type-specific */ 2741 if (rdev->desc->type == REGULATOR_CURRENT) { 2742 status = device_create_file(dev, &dev_attr_requested_microamps); 2743 if (status < 0) 2744 return status; 2745 } 2746 2747 /* all the other attributes exist to support constraints; 2748 * don't show them if there are no constraints, or if the 2749 * relevant supporting methods are missing. 2750 */ 2751 if (!rdev->constraints) 2752 return status; 2753 2754 /* constraints need specific supporting methods */ 2755 if (ops->set_voltage || ops->set_voltage_sel) { 2756 status = device_create_file(dev, &dev_attr_min_microvolts); 2757 if (status < 0) 2758 return status; 2759 status = device_create_file(dev, &dev_attr_max_microvolts); 2760 if (status < 0) 2761 return status; 2762 } 2763 if (ops->set_current_limit) { 2764 status = device_create_file(dev, &dev_attr_min_microamps); 2765 if (status < 0) 2766 return status; 2767 status = device_create_file(dev, &dev_attr_max_microamps); 2768 if (status < 0) 2769 return status; 2770 } 2771 2772 /* suspend mode constraints need multiple supporting methods */ 2773 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2774 return status; 2775 2776 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2777 if (status < 0) 2778 return status; 2779 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2780 if (status < 0) 2781 return status; 2782 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2783 if (status < 0) 2784 return status; 2785 2786 if (ops->set_suspend_voltage) { 2787 status = device_create_file(dev, 2788 &dev_attr_suspend_standby_microvolts); 2789 if (status < 0) 2790 return status; 2791 status = device_create_file(dev, 2792 &dev_attr_suspend_mem_microvolts); 2793 if (status < 0) 2794 return status; 2795 status = device_create_file(dev, 2796 &dev_attr_suspend_disk_microvolts); 2797 if (status < 0) 2798 return status; 2799 } 2800 2801 if (ops->set_suspend_mode) { 2802 status = device_create_file(dev, 2803 &dev_attr_suspend_standby_mode); 2804 if (status < 0) 2805 return status; 2806 status = device_create_file(dev, 2807 &dev_attr_suspend_mem_mode); 2808 if (status < 0) 2809 return status; 2810 status = device_create_file(dev, 2811 &dev_attr_suspend_disk_mode); 2812 if (status < 0) 2813 return status; 2814 } 2815 2816 return status; 2817} 2818 2819static void rdev_init_debugfs(struct regulator_dev *rdev) 2820{ 2821#ifdef CONFIG_DEBUG_FS 2822 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2823 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2824 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2825 rdev->debugfs = NULL; 2826 return; 2827 } 2828 2829 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2830 &rdev->use_count); 2831 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2832 &rdev->open_count); 2833#endif 2834} 2835 2836/** 2837 * regulator_register - register regulator 2838 * @regulator_desc: regulator to register 2839 * @dev: struct device for the regulator 2840 * @init_data: platform provided init data, passed through by driver 2841 * @driver_data: private regulator data 2842 * 2843 * Called by regulator drivers to register a regulator. 2844 * Returns 0 on success. 2845 */ 2846struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2847 struct device *dev, const struct regulator_init_data *init_data, 2848 void *driver_data, struct device_node *of_node) 2849{ 2850 const struct regulation_constraints *constraints = NULL; 2851 static atomic_t regulator_no = ATOMIC_INIT(0); 2852 struct regulator_dev *rdev; 2853 int ret, i; 2854 const char *supply = NULL; 2855 2856 if (regulator_desc == NULL) 2857 return ERR_PTR(-EINVAL); 2858 2859 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2860 return ERR_PTR(-EINVAL); 2861 2862 if (regulator_desc->type != REGULATOR_VOLTAGE && 2863 regulator_desc->type != REGULATOR_CURRENT) 2864 return ERR_PTR(-EINVAL); 2865 2866 /* Only one of each should be implemented */ 2867 WARN_ON(regulator_desc->ops->get_voltage && 2868 regulator_desc->ops->get_voltage_sel); 2869 WARN_ON(regulator_desc->ops->set_voltage && 2870 regulator_desc->ops->set_voltage_sel); 2871 2872 /* If we're using selectors we must implement list_voltage. */ 2873 if (regulator_desc->ops->get_voltage_sel && 2874 !regulator_desc->ops->list_voltage) { 2875 return ERR_PTR(-EINVAL); 2876 } 2877 if (regulator_desc->ops->set_voltage_sel && 2878 !regulator_desc->ops->list_voltage) { 2879 return ERR_PTR(-EINVAL); 2880 } 2881 2882 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2883 if (rdev == NULL) 2884 return ERR_PTR(-ENOMEM); 2885 2886 mutex_lock(®ulator_list_mutex); 2887 2888 mutex_init(&rdev->mutex); 2889 rdev->reg_data = driver_data; 2890 rdev->owner = regulator_desc->owner; 2891 rdev->desc = regulator_desc; 2892 INIT_LIST_HEAD(&rdev->consumer_list); 2893 INIT_LIST_HEAD(&rdev->list); 2894 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2895 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2896 2897 /* preform any regulator specific init */ 2898 if (init_data && init_data->regulator_init) { 2899 ret = init_data->regulator_init(rdev->reg_data); 2900 if (ret < 0) 2901 goto clean; 2902 } 2903 2904 /* register with sysfs */ 2905 rdev->dev.class = ®ulator_class; 2906 rdev->dev.of_node = of_node; 2907 rdev->dev.parent = dev; 2908 dev_set_name(&rdev->dev, "regulator.%d", 2909 atomic_inc_return(®ulator_no) - 1); 2910 ret = device_register(&rdev->dev); 2911 if (ret != 0) { 2912 put_device(&rdev->dev); 2913 goto clean; 2914 } 2915 2916 dev_set_drvdata(&rdev->dev, rdev); 2917 2918 /* set regulator constraints */ 2919 if (init_data) 2920 constraints = &init_data->constraints; 2921 2922 ret = set_machine_constraints(rdev, constraints); 2923 if (ret < 0) 2924 goto scrub; 2925 2926 /* add attributes supported by this regulator */ 2927 ret = add_regulator_attributes(rdev); 2928 if (ret < 0) 2929 goto scrub; 2930 2931 if (init_data && init_data->supply_regulator) 2932 supply = init_data->supply_regulator; 2933 else if (regulator_desc->supply_name) 2934 supply = regulator_desc->supply_name; 2935 2936 if (supply) { 2937 struct regulator_dev *r; 2938 2939 r = regulator_dev_lookup(dev, supply); 2940 2941 if (!r) { 2942 dev_err(dev, "Failed to find supply %s\n", supply); 2943 ret = -ENODEV; 2944 goto scrub; 2945 } 2946 2947 ret = set_supply(rdev, r); 2948 if (ret < 0) 2949 goto scrub; 2950 2951 /* Enable supply if rail is enabled */ 2952 if (rdev->desc->ops->is_enabled && 2953 rdev->desc->ops->is_enabled(rdev)) { 2954 ret = regulator_enable(rdev->supply); 2955 if (ret < 0) 2956 goto scrub; 2957 } 2958 } 2959 2960 /* add consumers devices */ 2961 if (init_data) { 2962 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2963 ret = set_consumer_device_supply(rdev, 2964 init_data->consumer_supplies[i].dev, 2965 init_data->consumer_supplies[i].dev_name, 2966 init_data->consumer_supplies[i].supply); 2967 if (ret < 0) { 2968 dev_err(dev, "Failed to set supply %s\n", 2969 init_data->consumer_supplies[i].supply); 2970 goto unset_supplies; 2971 } 2972 } 2973 } 2974 2975 list_add(&rdev->list, ®ulator_list); 2976 2977 rdev_init_debugfs(rdev); 2978out: 2979 mutex_unlock(®ulator_list_mutex); 2980 return rdev; 2981 2982unset_supplies: 2983 unset_regulator_supplies(rdev); 2984 2985scrub: 2986 kfree(rdev->constraints); 2987 device_unregister(&rdev->dev); 2988 /* device core frees rdev */ 2989 rdev = ERR_PTR(ret); 2990 goto out; 2991 2992clean: 2993 kfree(rdev); 2994 rdev = ERR_PTR(ret); 2995 goto out; 2996} 2997EXPORT_SYMBOL_GPL(regulator_register); 2998 2999/** 3000 * regulator_unregister - unregister regulator 3001 * @rdev: regulator to unregister 3002 * 3003 * Called by regulator drivers to unregister a regulator. 3004 */ 3005void regulator_unregister(struct regulator_dev *rdev) 3006{ 3007 if (rdev == NULL) 3008 return; 3009 3010 mutex_lock(®ulator_list_mutex); 3011#ifdef CONFIG_DEBUG_FS 3012 debugfs_remove_recursive(rdev->debugfs); 3013#endif 3014 flush_work_sync(&rdev->disable_work.work); 3015 WARN_ON(rdev->open_count); 3016 unset_regulator_supplies(rdev); 3017 list_del(&rdev->list); 3018 if (rdev->supply) 3019 regulator_put(rdev->supply); 3020 kfree(rdev->constraints); 3021 device_unregister(&rdev->dev); 3022 mutex_unlock(®ulator_list_mutex); 3023} 3024EXPORT_SYMBOL_GPL(regulator_unregister); 3025 3026/** 3027 * regulator_suspend_prepare - prepare regulators for system wide suspend 3028 * @state: system suspend state 3029 * 3030 * Configure each regulator with it's suspend operating parameters for state. 3031 * This will usually be called by machine suspend code prior to supending. 3032 */ 3033int regulator_suspend_prepare(suspend_state_t state) 3034{ 3035 struct regulator_dev *rdev; 3036 int ret = 0; 3037 3038 /* ON is handled by regulator active state */ 3039 if (state == PM_SUSPEND_ON) 3040 return -EINVAL; 3041 3042 mutex_lock(®ulator_list_mutex); 3043 list_for_each_entry(rdev, ®ulator_list, list) { 3044 3045 mutex_lock(&rdev->mutex); 3046 ret = suspend_prepare(rdev, state); 3047 mutex_unlock(&rdev->mutex); 3048 3049 if (ret < 0) { 3050 rdev_err(rdev, "failed to prepare\n"); 3051 goto out; 3052 } 3053 } 3054out: 3055 mutex_unlock(®ulator_list_mutex); 3056 return ret; 3057} 3058EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3059 3060/** 3061 * regulator_suspend_finish - resume regulators from system wide suspend 3062 * 3063 * Turn on regulators that might be turned off by regulator_suspend_prepare 3064 * and that should be turned on according to the regulators properties. 3065 */ 3066int regulator_suspend_finish(void) 3067{ 3068 struct regulator_dev *rdev; 3069 int ret = 0, error; 3070 3071 mutex_lock(®ulator_list_mutex); 3072 list_for_each_entry(rdev, ®ulator_list, list) { 3073 struct regulator_ops *ops = rdev->desc->ops; 3074 3075 mutex_lock(&rdev->mutex); 3076 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3077 ops->enable) { 3078 error = ops->enable(rdev); 3079 if (error) 3080 ret = error; 3081 } else { 3082 if (!has_full_constraints) 3083 goto unlock; 3084 if (!ops->disable) 3085 goto unlock; 3086 if (ops->is_enabled && !ops->is_enabled(rdev)) 3087 goto unlock; 3088 3089 error = ops->disable(rdev); 3090 if (error) 3091 ret = error; 3092 } 3093unlock: 3094 mutex_unlock(&rdev->mutex); 3095 } 3096 mutex_unlock(®ulator_list_mutex); 3097 return ret; 3098} 3099EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3100 3101/** 3102 * regulator_has_full_constraints - the system has fully specified constraints 3103 * 3104 * Calling this function will cause the regulator API to disable all 3105 * regulators which have a zero use count and don't have an always_on 3106 * constraint in a late_initcall. 3107 * 3108 * The intention is that this will become the default behaviour in a 3109 * future kernel release so users are encouraged to use this facility 3110 * now. 3111 */ 3112void regulator_has_full_constraints(void) 3113{ 3114 has_full_constraints = 1; 3115} 3116EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3117 3118/** 3119 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3120 * 3121 * Calling this function will cause the regulator API to provide a 3122 * dummy regulator to consumers if no physical regulator is found, 3123 * allowing most consumers to proceed as though a regulator were 3124 * configured. This allows systems such as those with software 3125 * controllable regulators for the CPU core only to be brought up more 3126 * readily. 3127 */ 3128void regulator_use_dummy_regulator(void) 3129{ 3130 board_wants_dummy_regulator = true; 3131} 3132EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3133 3134/** 3135 * rdev_get_drvdata - get rdev regulator driver data 3136 * @rdev: regulator 3137 * 3138 * Get rdev regulator driver private data. This call can be used in the 3139 * regulator driver context. 3140 */ 3141void *rdev_get_drvdata(struct regulator_dev *rdev) 3142{ 3143 return rdev->reg_data; 3144} 3145EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3146 3147/** 3148 * regulator_get_drvdata - get regulator driver data 3149 * @regulator: regulator 3150 * 3151 * Get regulator driver private data. This call can be used in the consumer 3152 * driver context when non API regulator specific functions need to be called. 3153 */ 3154void *regulator_get_drvdata(struct regulator *regulator) 3155{ 3156 return regulator->rdev->reg_data; 3157} 3158EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3159 3160/** 3161 * regulator_set_drvdata - set regulator driver data 3162 * @regulator: regulator 3163 * @data: data 3164 */ 3165void regulator_set_drvdata(struct regulator *regulator, void *data) 3166{ 3167 regulator->rdev->reg_data = data; 3168} 3169EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3170 3171/** 3172 * regulator_get_id - get regulator ID 3173 * @rdev: regulator 3174 */ 3175int rdev_get_id(struct regulator_dev *rdev) 3176{ 3177 return rdev->desc->id; 3178} 3179EXPORT_SYMBOL_GPL(rdev_get_id); 3180 3181struct device *rdev_get_dev(struct regulator_dev *rdev) 3182{ 3183 return &rdev->dev; 3184} 3185EXPORT_SYMBOL_GPL(rdev_get_dev); 3186 3187void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3188{ 3189 return reg_init_data->driver_data; 3190} 3191EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3192 3193#ifdef CONFIG_DEBUG_FS 3194static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3195 size_t count, loff_t *ppos) 3196{ 3197 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3198 ssize_t len, ret = 0; 3199 struct regulator_map *map; 3200 3201 if (!buf) 3202 return -ENOMEM; 3203 3204 list_for_each_entry(map, ®ulator_map_list, list) { 3205 len = snprintf(buf + ret, PAGE_SIZE - ret, 3206 "%s -> %s.%s\n", 3207 rdev_get_name(map->regulator), map->dev_name, 3208 map->supply); 3209 if (len >= 0) 3210 ret += len; 3211 if (ret > PAGE_SIZE) { 3212 ret = PAGE_SIZE; 3213 break; 3214 } 3215 } 3216 3217 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3218 3219 kfree(buf); 3220 3221 return ret; 3222} 3223 3224static const struct file_operations supply_map_fops = { 3225 .read = supply_map_read_file, 3226 .llseek = default_llseek, 3227}; 3228#endif 3229 3230static int __init regulator_init(void) 3231{ 3232 int ret; 3233 3234 ret = class_register(®ulator_class); 3235 3236#ifdef CONFIG_DEBUG_FS 3237 debugfs_root = debugfs_create_dir("regulator", NULL); 3238 if (IS_ERR(debugfs_root) || !debugfs_root) { 3239 pr_warn("regulator: Failed to create debugfs directory\n"); 3240 debugfs_root = NULL; 3241 } 3242 3243 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3244 NULL, &supply_map_fops))) 3245 pr_warn("regulator: Failed to create supplies debugfs\n"); 3246#endif 3247 3248 regulator_dummy_init(); 3249 3250 return ret; 3251} 3252 3253/* init early to allow our consumers to complete system booting */ 3254core_initcall(regulator_init); 3255 3256static int __init regulator_init_complete(void) 3257{ 3258 struct regulator_dev *rdev; 3259 struct regulator_ops *ops; 3260 struct regulation_constraints *c; 3261 int enabled, ret; 3262 3263 mutex_lock(®ulator_list_mutex); 3264 3265 /* If we have a full configuration then disable any regulators 3266 * which are not in use or always_on. This will become the 3267 * default behaviour in the future. 3268 */ 3269 list_for_each_entry(rdev, ®ulator_list, list) { 3270 ops = rdev->desc->ops; 3271 c = rdev->constraints; 3272 3273 if (!ops->disable || (c && c->always_on)) 3274 continue; 3275 3276 mutex_lock(&rdev->mutex); 3277 3278 if (rdev->use_count) 3279 goto unlock; 3280 3281 /* If we can't read the status assume it's on. */ 3282 if (ops->is_enabled) 3283 enabled = ops->is_enabled(rdev); 3284 else 3285 enabled = 1; 3286 3287 if (!enabled) 3288 goto unlock; 3289 3290 if (has_full_constraints) { 3291 /* We log since this may kill the system if it 3292 * goes wrong. */ 3293 rdev_info(rdev, "disabling\n"); 3294 ret = ops->disable(rdev); 3295 if (ret != 0) { 3296 rdev_err(rdev, "couldn't disable: %d\n", ret); 3297 } 3298 } else { 3299 /* The intention is that in future we will 3300 * assume that full constraints are provided 3301 * so warn even if we aren't going to do 3302 * anything here. 3303 */ 3304 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3305 } 3306 3307unlock: 3308 mutex_unlock(&rdev->mutex); 3309 } 3310 3311 mutex_unlock(®ulator_list_mutex); 3312 3313 return 0; 3314} 3315late_initcall(regulator_init_complete); 3316