core.c revision 5bc78015998e14bf0362a01fc47e8b63053dbfd8
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_name: dev_name() string for device supply applies to 1000 * @supply: symbolic name for supply 1001 * 1002 * Allows platform initialisation code to map physical regulator 1003 * sources to symbolic names for supplies for use by devices. Devices 1004 * should use these symbolic names to request regulators, avoiding the 1005 * need to provide board-specific regulator names as platform data. 1006 */ 1007static int set_consumer_device_supply(struct regulator_dev *rdev, 1008 const char *consumer_dev_name, 1009 const char *supply) 1010{ 1011 struct regulator_map *node; 1012 int has_dev; 1013 1014 if (supply == NULL) 1015 return -EINVAL; 1016 1017 if (consumer_dev_name != NULL) 1018 has_dev = 1; 1019 else 1020 has_dev = 0; 1021 1022 list_for_each_entry(node, ®ulator_map_list, list) { 1023 if (node->dev_name && consumer_dev_name) { 1024 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1025 continue; 1026 } else if (node->dev_name || consumer_dev_name) { 1027 continue; 1028 } 1029 1030 if (strcmp(node->supply, supply) != 0) 1031 continue; 1032 1033 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1034 consumer_dev_name, 1035 dev_name(&node->regulator->dev), 1036 node->regulator->desc->name, 1037 supply, 1038 dev_name(&rdev->dev), rdev_get_name(rdev)); 1039 return -EBUSY; 1040 } 1041 1042 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1043 if (node == NULL) 1044 return -ENOMEM; 1045 1046 node->regulator = rdev; 1047 node->supply = supply; 1048 1049 if (has_dev) { 1050 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1051 if (node->dev_name == NULL) { 1052 kfree(node); 1053 return -ENOMEM; 1054 } 1055 } 1056 1057 list_add(&node->list, ®ulator_map_list); 1058 return 0; 1059} 1060 1061static void unset_regulator_supplies(struct regulator_dev *rdev) 1062{ 1063 struct regulator_map *node, *n; 1064 1065 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1066 if (rdev == node->regulator) { 1067 list_del(&node->list); 1068 kfree(node->dev_name); 1069 kfree(node); 1070 } 1071 } 1072} 1073 1074#define REG_STR_SIZE 64 1075 1076static struct regulator *create_regulator(struct regulator_dev *rdev, 1077 struct device *dev, 1078 const char *supply_name) 1079{ 1080 struct regulator *regulator; 1081 char buf[REG_STR_SIZE]; 1082 int err, size; 1083 1084 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1085 if (regulator == NULL) 1086 return NULL; 1087 1088 mutex_lock(&rdev->mutex); 1089 regulator->rdev = rdev; 1090 list_add(®ulator->list, &rdev->consumer_list); 1091 1092 if (dev) { 1093 /* create a 'requested_microamps_name' sysfs entry */ 1094 size = scnprintf(buf, REG_STR_SIZE, 1095 "microamps_requested_%s-%s", 1096 dev_name(dev), supply_name); 1097 if (size >= REG_STR_SIZE) 1098 goto overflow_err; 1099 1100 regulator->dev = dev; 1101 sysfs_attr_init(®ulator->dev_attr.attr); 1102 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1103 if (regulator->dev_attr.attr.name == NULL) 1104 goto attr_name_err; 1105 1106 regulator->dev_attr.attr.mode = 0444; 1107 regulator->dev_attr.show = device_requested_uA_show; 1108 err = device_create_file(dev, ®ulator->dev_attr); 1109 if (err < 0) { 1110 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1111 goto attr_name_err; 1112 } 1113 1114 /* also add a link to the device sysfs entry */ 1115 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1116 dev->kobj.name, supply_name); 1117 if (size >= REG_STR_SIZE) 1118 goto attr_err; 1119 1120 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1121 if (regulator->supply_name == NULL) 1122 goto attr_err; 1123 1124 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1125 buf); 1126 if (err) { 1127 rdev_warn(rdev, "could not add device link %s err %d\n", 1128 dev->kobj.name, err); 1129 goto link_name_err; 1130 } 1131 } else { 1132 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1133 if (regulator->supply_name == NULL) 1134 goto attr_err; 1135 } 1136 1137#ifdef CONFIG_DEBUG_FS 1138 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1139 rdev->debugfs); 1140 if (IS_ERR_OR_NULL(regulator->debugfs)) { 1141 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1142 regulator->debugfs = NULL; 1143 } else { 1144 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1145 ®ulator->uA_load); 1146 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1147 ®ulator->min_uV); 1148 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1149 ®ulator->max_uV); 1150 } 1151#endif 1152 1153 mutex_unlock(&rdev->mutex); 1154 return regulator; 1155link_name_err: 1156 kfree(regulator->supply_name); 1157attr_err: 1158 device_remove_file(regulator->dev, ®ulator->dev_attr); 1159attr_name_err: 1160 kfree(regulator->dev_attr.attr.name); 1161overflow_err: 1162 list_del(®ulator->list); 1163 kfree(regulator); 1164 mutex_unlock(&rdev->mutex); 1165 return NULL; 1166} 1167 1168static int _regulator_get_enable_time(struct regulator_dev *rdev) 1169{ 1170 if (!rdev->desc->ops->enable_time) 1171 return 0; 1172 return rdev->desc->ops->enable_time(rdev); 1173} 1174 1175static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1176 const char *supply) 1177{ 1178 struct regulator_dev *r; 1179 struct device_node *node; 1180 1181 /* first do a dt based lookup */ 1182 if (dev && dev->of_node) { 1183 node = of_get_regulator(dev, supply); 1184 if (node) 1185 list_for_each_entry(r, ®ulator_list, list) 1186 if (r->dev.parent && 1187 node == r->dev.of_node) 1188 return r; 1189 } 1190 1191 /* if not found, try doing it non-dt way */ 1192 list_for_each_entry(r, ®ulator_list, list) 1193 if (strcmp(rdev_get_name(r), supply) == 0) 1194 return r; 1195 1196 return NULL; 1197} 1198 1199/* Internal regulator request function */ 1200static struct regulator *_regulator_get(struct device *dev, const char *id, 1201 int exclusive) 1202{ 1203 struct regulator_dev *rdev; 1204 struct regulator_map *map; 1205 struct regulator *regulator = ERR_PTR(-ENODEV); 1206 const char *devname = NULL; 1207 int ret; 1208 1209 if (id == NULL) { 1210 pr_err("get() with no identifier\n"); 1211 return regulator; 1212 } 1213 1214 if (dev) 1215 devname = dev_name(dev); 1216 1217 mutex_lock(®ulator_list_mutex); 1218 1219 rdev = regulator_dev_lookup(dev, id); 1220 if (rdev) 1221 goto found; 1222 1223 list_for_each_entry(map, ®ulator_map_list, list) { 1224 /* If the mapping has a device set up it must match */ 1225 if (map->dev_name && 1226 (!devname || strcmp(map->dev_name, devname))) 1227 continue; 1228 1229 if (strcmp(map->supply, id) == 0) { 1230 rdev = map->regulator; 1231 goto found; 1232 } 1233 } 1234 1235 if (board_wants_dummy_regulator) { 1236 rdev = dummy_regulator_rdev; 1237 goto found; 1238 } 1239 1240#ifdef CONFIG_REGULATOR_DUMMY 1241 if (!devname) 1242 devname = "deviceless"; 1243 1244 /* If the board didn't flag that it was fully constrained then 1245 * substitute in a dummy regulator so consumers can continue. 1246 */ 1247 if (!has_full_constraints) { 1248 pr_warn("%s supply %s not found, using dummy regulator\n", 1249 devname, id); 1250 rdev = dummy_regulator_rdev; 1251 goto found; 1252 } 1253#endif 1254 1255 mutex_unlock(®ulator_list_mutex); 1256 return regulator; 1257 1258found: 1259 if (rdev->exclusive) { 1260 regulator = ERR_PTR(-EPERM); 1261 goto out; 1262 } 1263 1264 if (exclusive && rdev->open_count) { 1265 regulator = ERR_PTR(-EBUSY); 1266 goto out; 1267 } 1268 1269 if (!try_module_get(rdev->owner)) 1270 goto out; 1271 1272 regulator = create_regulator(rdev, dev, id); 1273 if (regulator == NULL) { 1274 regulator = ERR_PTR(-ENOMEM); 1275 module_put(rdev->owner); 1276 goto out; 1277 } 1278 1279 rdev->open_count++; 1280 if (exclusive) { 1281 rdev->exclusive = 1; 1282 1283 ret = _regulator_is_enabled(rdev); 1284 if (ret > 0) 1285 rdev->use_count = 1; 1286 else 1287 rdev->use_count = 0; 1288 } 1289 1290out: 1291 mutex_unlock(®ulator_list_mutex); 1292 1293 return regulator; 1294} 1295 1296/** 1297 * regulator_get - lookup and obtain a reference to a regulator. 1298 * @dev: device for regulator "consumer" 1299 * @id: Supply name or regulator ID. 1300 * 1301 * Returns a struct regulator corresponding to the regulator producer, 1302 * or IS_ERR() condition containing errno. 1303 * 1304 * Use of supply names configured via regulator_set_device_supply() is 1305 * strongly encouraged. It is recommended that the supply name used 1306 * should match the name used for the supply and/or the relevant 1307 * device pins in the datasheet. 1308 */ 1309struct regulator *regulator_get(struct device *dev, const char *id) 1310{ 1311 return _regulator_get(dev, id, 0); 1312} 1313EXPORT_SYMBOL_GPL(regulator_get); 1314 1315/** 1316 * regulator_get_exclusive - obtain exclusive access to a regulator. 1317 * @dev: device for regulator "consumer" 1318 * @id: Supply name or regulator ID. 1319 * 1320 * Returns a struct regulator corresponding to the regulator producer, 1321 * or IS_ERR() condition containing errno. Other consumers will be 1322 * unable to obtain this reference is held and the use count for the 1323 * regulator will be initialised to reflect the current state of the 1324 * regulator. 1325 * 1326 * This is intended for use by consumers which cannot tolerate shared 1327 * use of the regulator such as those which need to force the 1328 * regulator off for correct operation of the hardware they are 1329 * controlling. 1330 * 1331 * Use of supply names configured via regulator_set_device_supply() is 1332 * strongly encouraged. It is recommended that the supply name used 1333 * should match the name used for the supply and/or the relevant 1334 * device pins in the datasheet. 1335 */ 1336struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1337{ 1338 return _regulator_get(dev, id, 1); 1339} 1340EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1341 1342/** 1343 * regulator_put - "free" the regulator source 1344 * @regulator: regulator source 1345 * 1346 * Note: drivers must ensure that all regulator_enable calls made on this 1347 * regulator source are balanced by regulator_disable calls prior to calling 1348 * this function. 1349 */ 1350void regulator_put(struct regulator *regulator) 1351{ 1352 struct regulator_dev *rdev; 1353 1354 if (regulator == NULL || IS_ERR(regulator)) 1355 return; 1356 1357 mutex_lock(®ulator_list_mutex); 1358 rdev = regulator->rdev; 1359 1360#ifdef CONFIG_DEBUG_FS 1361 debugfs_remove_recursive(regulator->debugfs); 1362#endif 1363 1364 /* remove any sysfs entries */ 1365 if (regulator->dev) { 1366 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1367 device_remove_file(regulator->dev, ®ulator->dev_attr); 1368 kfree(regulator->dev_attr.attr.name); 1369 } 1370 kfree(regulator->supply_name); 1371 list_del(®ulator->list); 1372 kfree(regulator); 1373 1374 rdev->open_count--; 1375 rdev->exclusive = 0; 1376 1377 module_put(rdev->owner); 1378 mutex_unlock(®ulator_list_mutex); 1379} 1380EXPORT_SYMBOL_GPL(regulator_put); 1381 1382static int _regulator_can_change_status(struct regulator_dev *rdev) 1383{ 1384 if (!rdev->constraints) 1385 return 0; 1386 1387 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1388 return 1; 1389 else 1390 return 0; 1391} 1392 1393/* locks held by regulator_enable() */ 1394static int _regulator_enable(struct regulator_dev *rdev) 1395{ 1396 int ret, delay; 1397 1398 /* check voltage and requested load before enabling */ 1399 if (rdev->constraints && 1400 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1401 drms_uA_update(rdev); 1402 1403 if (rdev->use_count == 0) { 1404 /* The regulator may on if it's not switchable or left on */ 1405 ret = _regulator_is_enabled(rdev); 1406 if (ret == -EINVAL || ret == 0) { 1407 if (!_regulator_can_change_status(rdev)) 1408 return -EPERM; 1409 1410 if (!rdev->desc->ops->enable) 1411 return -EINVAL; 1412 1413 /* Query before enabling in case configuration 1414 * dependent. */ 1415 ret = _regulator_get_enable_time(rdev); 1416 if (ret >= 0) { 1417 delay = ret; 1418 } else { 1419 rdev_warn(rdev, "enable_time() failed: %d\n", 1420 ret); 1421 delay = 0; 1422 } 1423 1424 trace_regulator_enable(rdev_get_name(rdev)); 1425 1426 /* Allow the regulator to ramp; it would be useful 1427 * to extend this for bulk operations so that the 1428 * regulators can ramp together. */ 1429 ret = rdev->desc->ops->enable(rdev); 1430 if (ret < 0) 1431 return ret; 1432 1433 trace_regulator_enable_delay(rdev_get_name(rdev)); 1434 1435 if (delay >= 1000) { 1436 mdelay(delay / 1000); 1437 udelay(delay % 1000); 1438 } else if (delay) { 1439 udelay(delay); 1440 } 1441 1442 trace_regulator_enable_complete(rdev_get_name(rdev)); 1443 1444 } else if (ret < 0) { 1445 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1446 return ret; 1447 } 1448 /* Fallthrough on positive return values - already enabled */ 1449 } 1450 1451 rdev->use_count++; 1452 1453 return 0; 1454} 1455 1456/** 1457 * regulator_enable - enable regulator output 1458 * @regulator: regulator source 1459 * 1460 * Request that the regulator be enabled with the regulator output at 1461 * the predefined voltage or current value. Calls to regulator_enable() 1462 * must be balanced with calls to regulator_disable(). 1463 * 1464 * NOTE: the output value can be set by other drivers, boot loader or may be 1465 * hardwired in the regulator. 1466 */ 1467int regulator_enable(struct regulator *regulator) 1468{ 1469 struct regulator_dev *rdev = regulator->rdev; 1470 int ret = 0; 1471 1472 if (rdev->supply) { 1473 ret = regulator_enable(rdev->supply); 1474 if (ret != 0) 1475 return ret; 1476 } 1477 1478 mutex_lock(&rdev->mutex); 1479 ret = _regulator_enable(rdev); 1480 mutex_unlock(&rdev->mutex); 1481 1482 if (ret != 0 && rdev->supply) 1483 regulator_disable(rdev->supply); 1484 1485 return ret; 1486} 1487EXPORT_SYMBOL_GPL(regulator_enable); 1488 1489/* locks held by regulator_disable() */ 1490static int _regulator_disable(struct regulator_dev *rdev) 1491{ 1492 int ret = 0; 1493 1494 if (WARN(rdev->use_count <= 0, 1495 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1496 return -EIO; 1497 1498 /* are we the last user and permitted to disable ? */ 1499 if (rdev->use_count == 1 && 1500 (rdev->constraints && !rdev->constraints->always_on)) { 1501 1502 /* we are last user */ 1503 if (_regulator_can_change_status(rdev) && 1504 rdev->desc->ops->disable) { 1505 trace_regulator_disable(rdev_get_name(rdev)); 1506 1507 ret = rdev->desc->ops->disable(rdev); 1508 if (ret < 0) { 1509 rdev_err(rdev, "failed to disable\n"); 1510 return ret; 1511 } 1512 1513 trace_regulator_disable_complete(rdev_get_name(rdev)); 1514 1515 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1516 NULL); 1517 } 1518 1519 rdev->use_count = 0; 1520 } else if (rdev->use_count > 1) { 1521 1522 if (rdev->constraints && 1523 (rdev->constraints->valid_ops_mask & 1524 REGULATOR_CHANGE_DRMS)) 1525 drms_uA_update(rdev); 1526 1527 rdev->use_count--; 1528 } 1529 1530 return ret; 1531} 1532 1533/** 1534 * regulator_disable - disable regulator output 1535 * @regulator: regulator source 1536 * 1537 * Disable the regulator output voltage or current. Calls to 1538 * regulator_enable() must be balanced with calls to 1539 * regulator_disable(). 1540 * 1541 * NOTE: this will only disable the regulator output if no other consumer 1542 * devices have it enabled, the regulator device supports disabling and 1543 * machine constraints permit this operation. 1544 */ 1545int regulator_disable(struct regulator *regulator) 1546{ 1547 struct regulator_dev *rdev = regulator->rdev; 1548 int ret = 0; 1549 1550 mutex_lock(&rdev->mutex); 1551 ret = _regulator_disable(rdev); 1552 mutex_unlock(&rdev->mutex); 1553 1554 if (ret == 0 && rdev->supply) 1555 regulator_disable(rdev->supply); 1556 1557 return ret; 1558} 1559EXPORT_SYMBOL_GPL(regulator_disable); 1560 1561/* locks held by regulator_force_disable() */ 1562static int _regulator_force_disable(struct regulator_dev *rdev) 1563{ 1564 int ret = 0; 1565 1566 /* force disable */ 1567 if (rdev->desc->ops->disable) { 1568 /* ah well, who wants to live forever... */ 1569 ret = rdev->desc->ops->disable(rdev); 1570 if (ret < 0) { 1571 rdev_err(rdev, "failed to force disable\n"); 1572 return ret; 1573 } 1574 /* notify other consumers that power has been forced off */ 1575 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1576 REGULATOR_EVENT_DISABLE, NULL); 1577 } 1578 1579 return ret; 1580} 1581 1582/** 1583 * regulator_force_disable - force disable regulator output 1584 * @regulator: regulator source 1585 * 1586 * Forcibly disable the regulator output voltage or current. 1587 * NOTE: this *will* disable the regulator output even if other consumer 1588 * devices have it enabled. This should be used for situations when device 1589 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1590 */ 1591int regulator_force_disable(struct regulator *regulator) 1592{ 1593 struct regulator_dev *rdev = regulator->rdev; 1594 int ret; 1595 1596 mutex_lock(&rdev->mutex); 1597 regulator->uA_load = 0; 1598 ret = _regulator_force_disable(regulator->rdev); 1599 mutex_unlock(&rdev->mutex); 1600 1601 if (rdev->supply) 1602 while (rdev->open_count--) 1603 regulator_disable(rdev->supply); 1604 1605 return ret; 1606} 1607EXPORT_SYMBOL_GPL(regulator_force_disable); 1608 1609static void regulator_disable_work(struct work_struct *work) 1610{ 1611 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1612 disable_work.work); 1613 int count, i, ret; 1614 1615 mutex_lock(&rdev->mutex); 1616 1617 BUG_ON(!rdev->deferred_disables); 1618 1619 count = rdev->deferred_disables; 1620 rdev->deferred_disables = 0; 1621 1622 for (i = 0; i < count; i++) { 1623 ret = _regulator_disable(rdev); 1624 if (ret != 0) 1625 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1626 } 1627 1628 mutex_unlock(&rdev->mutex); 1629 1630 if (rdev->supply) { 1631 for (i = 0; i < count; i++) { 1632 ret = regulator_disable(rdev->supply); 1633 if (ret != 0) { 1634 rdev_err(rdev, 1635 "Supply disable failed: %d\n", ret); 1636 } 1637 } 1638 } 1639} 1640 1641/** 1642 * regulator_disable_deferred - disable regulator output with delay 1643 * @regulator: regulator source 1644 * @ms: miliseconds until the regulator is disabled 1645 * 1646 * Execute regulator_disable() on the regulator after a delay. This 1647 * is intended for use with devices that require some time to quiesce. 1648 * 1649 * NOTE: this will only disable the regulator output if no other consumer 1650 * devices have it enabled, the regulator device supports disabling and 1651 * machine constraints permit this operation. 1652 */ 1653int regulator_disable_deferred(struct regulator *regulator, int ms) 1654{ 1655 struct regulator_dev *rdev = regulator->rdev; 1656 int ret; 1657 1658 mutex_lock(&rdev->mutex); 1659 rdev->deferred_disables++; 1660 mutex_unlock(&rdev->mutex); 1661 1662 ret = schedule_delayed_work(&rdev->disable_work, 1663 msecs_to_jiffies(ms)); 1664 if (ret < 0) 1665 return ret; 1666 else 1667 return 0; 1668} 1669EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1670 1671static int _regulator_is_enabled(struct regulator_dev *rdev) 1672{ 1673 /* If we don't know then assume that the regulator is always on */ 1674 if (!rdev->desc->ops->is_enabled) 1675 return 1; 1676 1677 return rdev->desc->ops->is_enabled(rdev); 1678} 1679 1680/** 1681 * regulator_is_enabled - is the regulator output enabled 1682 * @regulator: regulator source 1683 * 1684 * Returns positive if the regulator driver backing the source/client 1685 * has requested that the device be enabled, zero if it hasn't, else a 1686 * negative errno code. 1687 * 1688 * Note that the device backing this regulator handle can have multiple 1689 * users, so it might be enabled even if regulator_enable() was never 1690 * called for this particular source. 1691 */ 1692int regulator_is_enabled(struct regulator *regulator) 1693{ 1694 int ret; 1695 1696 mutex_lock(®ulator->rdev->mutex); 1697 ret = _regulator_is_enabled(regulator->rdev); 1698 mutex_unlock(®ulator->rdev->mutex); 1699 1700 return ret; 1701} 1702EXPORT_SYMBOL_GPL(regulator_is_enabled); 1703 1704/** 1705 * regulator_count_voltages - count regulator_list_voltage() selectors 1706 * @regulator: regulator source 1707 * 1708 * Returns number of selectors, or negative errno. Selectors are 1709 * numbered starting at zero, and typically correspond to bitfields 1710 * in hardware registers. 1711 */ 1712int regulator_count_voltages(struct regulator *regulator) 1713{ 1714 struct regulator_dev *rdev = regulator->rdev; 1715 1716 return rdev->desc->n_voltages ? : -EINVAL; 1717} 1718EXPORT_SYMBOL_GPL(regulator_count_voltages); 1719 1720/** 1721 * regulator_list_voltage - enumerate supported voltages 1722 * @regulator: regulator source 1723 * @selector: identify voltage to list 1724 * Context: can sleep 1725 * 1726 * Returns a voltage that can be passed to @regulator_set_voltage(), 1727 * zero if this selector code can't be used on this system, or a 1728 * negative errno. 1729 */ 1730int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1731{ 1732 struct regulator_dev *rdev = regulator->rdev; 1733 struct regulator_ops *ops = rdev->desc->ops; 1734 int ret; 1735 1736 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1737 return -EINVAL; 1738 1739 mutex_lock(&rdev->mutex); 1740 ret = ops->list_voltage(rdev, selector); 1741 mutex_unlock(&rdev->mutex); 1742 1743 if (ret > 0) { 1744 if (ret < rdev->constraints->min_uV) 1745 ret = 0; 1746 else if (ret > rdev->constraints->max_uV) 1747 ret = 0; 1748 } 1749 1750 return ret; 1751} 1752EXPORT_SYMBOL_GPL(regulator_list_voltage); 1753 1754/** 1755 * regulator_is_supported_voltage - check if a voltage range can be supported 1756 * 1757 * @regulator: Regulator to check. 1758 * @min_uV: Minimum required voltage in uV. 1759 * @max_uV: Maximum required voltage in uV. 1760 * 1761 * Returns a boolean or a negative error code. 1762 */ 1763int regulator_is_supported_voltage(struct regulator *regulator, 1764 int min_uV, int max_uV) 1765{ 1766 int i, voltages, ret; 1767 1768 ret = regulator_count_voltages(regulator); 1769 if (ret < 0) 1770 return ret; 1771 voltages = ret; 1772 1773 for (i = 0; i < voltages; i++) { 1774 ret = regulator_list_voltage(regulator, i); 1775 1776 if (ret >= min_uV && ret <= max_uV) 1777 return 1; 1778 } 1779 1780 return 0; 1781} 1782EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1783 1784static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1785 int min_uV, int max_uV) 1786{ 1787 int ret; 1788 int delay = 0; 1789 unsigned int selector; 1790 1791 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1792 1793 min_uV += rdev->constraints->uV_offset; 1794 max_uV += rdev->constraints->uV_offset; 1795 1796 if (rdev->desc->ops->set_voltage) { 1797 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1798 &selector); 1799 1800 if (rdev->desc->ops->list_voltage) 1801 selector = rdev->desc->ops->list_voltage(rdev, 1802 selector); 1803 else 1804 selector = -1; 1805 } else if (rdev->desc->ops->set_voltage_sel) { 1806 int best_val = INT_MAX; 1807 int i; 1808 1809 selector = 0; 1810 1811 /* Find the smallest voltage that falls within the specified 1812 * range. 1813 */ 1814 for (i = 0; i < rdev->desc->n_voltages; i++) { 1815 ret = rdev->desc->ops->list_voltage(rdev, i); 1816 if (ret < 0) 1817 continue; 1818 1819 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1820 best_val = ret; 1821 selector = i; 1822 } 1823 } 1824 1825 /* 1826 * If we can't obtain the old selector there is not enough 1827 * info to call set_voltage_time_sel(). 1828 */ 1829 if (rdev->desc->ops->set_voltage_time_sel && 1830 rdev->desc->ops->get_voltage_sel) { 1831 unsigned int old_selector = 0; 1832 1833 ret = rdev->desc->ops->get_voltage_sel(rdev); 1834 if (ret < 0) 1835 return ret; 1836 old_selector = ret; 1837 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1838 old_selector, selector); 1839 } 1840 1841 if (best_val != INT_MAX) { 1842 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1843 selector = best_val; 1844 } else { 1845 ret = -EINVAL; 1846 } 1847 } else { 1848 ret = -EINVAL; 1849 } 1850 1851 /* Insert any necessary delays */ 1852 if (delay >= 1000) { 1853 mdelay(delay / 1000); 1854 udelay(delay % 1000); 1855 } else if (delay) { 1856 udelay(delay); 1857 } 1858 1859 if (ret == 0) 1860 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1861 NULL); 1862 1863 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1864 1865 return ret; 1866} 1867 1868/** 1869 * regulator_set_voltage - set regulator output voltage 1870 * @regulator: regulator source 1871 * @min_uV: Minimum required voltage in uV 1872 * @max_uV: Maximum acceptable voltage in uV 1873 * 1874 * Sets a voltage regulator to the desired output voltage. This can be set 1875 * during any regulator state. IOW, regulator can be disabled or enabled. 1876 * 1877 * If the regulator is enabled then the voltage will change to the new value 1878 * immediately otherwise if the regulator is disabled the regulator will 1879 * output at the new voltage when enabled. 1880 * 1881 * NOTE: If the regulator is shared between several devices then the lowest 1882 * request voltage that meets the system constraints will be used. 1883 * Regulator system constraints must be set for this regulator before 1884 * calling this function otherwise this call will fail. 1885 */ 1886int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1887{ 1888 struct regulator_dev *rdev = regulator->rdev; 1889 int ret = 0; 1890 1891 mutex_lock(&rdev->mutex); 1892 1893 /* If we're setting the same range as last time the change 1894 * should be a noop (some cpufreq implementations use the same 1895 * voltage for multiple frequencies, for example). 1896 */ 1897 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1898 goto out; 1899 1900 /* sanity check */ 1901 if (!rdev->desc->ops->set_voltage && 1902 !rdev->desc->ops->set_voltage_sel) { 1903 ret = -EINVAL; 1904 goto out; 1905 } 1906 1907 /* constraints check */ 1908 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1909 if (ret < 0) 1910 goto out; 1911 regulator->min_uV = min_uV; 1912 regulator->max_uV = max_uV; 1913 1914 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1915 if (ret < 0) 1916 goto out; 1917 1918 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1919 1920out: 1921 mutex_unlock(&rdev->mutex); 1922 return ret; 1923} 1924EXPORT_SYMBOL_GPL(regulator_set_voltage); 1925 1926/** 1927 * regulator_set_voltage_time - get raise/fall time 1928 * @regulator: regulator source 1929 * @old_uV: starting voltage in microvolts 1930 * @new_uV: target voltage in microvolts 1931 * 1932 * Provided with the starting and ending voltage, this function attempts to 1933 * calculate the time in microseconds required to rise or fall to this new 1934 * voltage. 1935 */ 1936int regulator_set_voltage_time(struct regulator *regulator, 1937 int old_uV, int new_uV) 1938{ 1939 struct regulator_dev *rdev = regulator->rdev; 1940 struct regulator_ops *ops = rdev->desc->ops; 1941 int old_sel = -1; 1942 int new_sel = -1; 1943 int voltage; 1944 int i; 1945 1946 /* Currently requires operations to do this */ 1947 if (!ops->list_voltage || !ops->set_voltage_time_sel 1948 || !rdev->desc->n_voltages) 1949 return -EINVAL; 1950 1951 for (i = 0; i < rdev->desc->n_voltages; i++) { 1952 /* We only look for exact voltage matches here */ 1953 voltage = regulator_list_voltage(regulator, i); 1954 if (voltage < 0) 1955 return -EINVAL; 1956 if (voltage == 0) 1957 continue; 1958 if (voltage == old_uV) 1959 old_sel = i; 1960 if (voltage == new_uV) 1961 new_sel = i; 1962 } 1963 1964 if (old_sel < 0 || new_sel < 0) 1965 return -EINVAL; 1966 1967 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 1968} 1969EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 1970 1971/** 1972 * regulator_sync_voltage - re-apply last regulator output voltage 1973 * @regulator: regulator source 1974 * 1975 * Re-apply the last configured voltage. This is intended to be used 1976 * where some external control source the consumer is cooperating with 1977 * has caused the configured voltage to change. 1978 */ 1979int regulator_sync_voltage(struct regulator *regulator) 1980{ 1981 struct regulator_dev *rdev = regulator->rdev; 1982 int ret, min_uV, max_uV; 1983 1984 mutex_lock(&rdev->mutex); 1985 1986 if (!rdev->desc->ops->set_voltage && 1987 !rdev->desc->ops->set_voltage_sel) { 1988 ret = -EINVAL; 1989 goto out; 1990 } 1991 1992 /* This is only going to work if we've had a voltage configured. */ 1993 if (!regulator->min_uV && !regulator->max_uV) { 1994 ret = -EINVAL; 1995 goto out; 1996 } 1997 1998 min_uV = regulator->min_uV; 1999 max_uV = regulator->max_uV; 2000 2001 /* This should be a paranoia check... */ 2002 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2003 if (ret < 0) 2004 goto out; 2005 2006 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2007 if (ret < 0) 2008 goto out; 2009 2010 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2011 2012out: 2013 mutex_unlock(&rdev->mutex); 2014 return ret; 2015} 2016EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2017 2018static int _regulator_get_voltage(struct regulator_dev *rdev) 2019{ 2020 int sel, ret; 2021 2022 if (rdev->desc->ops->get_voltage_sel) { 2023 sel = rdev->desc->ops->get_voltage_sel(rdev); 2024 if (sel < 0) 2025 return sel; 2026 ret = rdev->desc->ops->list_voltage(rdev, sel); 2027 } else if (rdev->desc->ops->get_voltage) { 2028 ret = rdev->desc->ops->get_voltage(rdev); 2029 } else { 2030 return -EINVAL; 2031 } 2032 2033 if (ret < 0) 2034 return ret; 2035 return ret - rdev->constraints->uV_offset; 2036} 2037 2038/** 2039 * regulator_get_voltage - get regulator output voltage 2040 * @regulator: regulator source 2041 * 2042 * This returns the current regulator voltage in uV. 2043 * 2044 * NOTE: If the regulator is disabled it will return the voltage value. This 2045 * function should not be used to determine regulator state. 2046 */ 2047int regulator_get_voltage(struct regulator *regulator) 2048{ 2049 int ret; 2050 2051 mutex_lock(®ulator->rdev->mutex); 2052 2053 ret = _regulator_get_voltage(regulator->rdev); 2054 2055 mutex_unlock(®ulator->rdev->mutex); 2056 2057 return ret; 2058} 2059EXPORT_SYMBOL_GPL(regulator_get_voltage); 2060 2061/** 2062 * regulator_set_current_limit - set regulator output current limit 2063 * @regulator: regulator source 2064 * @min_uA: Minimuum supported current in uA 2065 * @max_uA: Maximum supported current in uA 2066 * 2067 * Sets current sink to the desired output current. This can be set during 2068 * any regulator state. IOW, regulator can be disabled or enabled. 2069 * 2070 * If the regulator is enabled then the current will change to the new value 2071 * immediately otherwise if the regulator is disabled the regulator will 2072 * output at the new current when enabled. 2073 * 2074 * NOTE: Regulator system constraints must be set for this regulator before 2075 * calling this function otherwise this call will fail. 2076 */ 2077int regulator_set_current_limit(struct regulator *regulator, 2078 int min_uA, int max_uA) 2079{ 2080 struct regulator_dev *rdev = regulator->rdev; 2081 int ret; 2082 2083 mutex_lock(&rdev->mutex); 2084 2085 /* sanity check */ 2086 if (!rdev->desc->ops->set_current_limit) { 2087 ret = -EINVAL; 2088 goto out; 2089 } 2090 2091 /* constraints check */ 2092 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2093 if (ret < 0) 2094 goto out; 2095 2096 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2097out: 2098 mutex_unlock(&rdev->mutex); 2099 return ret; 2100} 2101EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2102 2103static int _regulator_get_current_limit(struct regulator_dev *rdev) 2104{ 2105 int ret; 2106 2107 mutex_lock(&rdev->mutex); 2108 2109 /* sanity check */ 2110 if (!rdev->desc->ops->get_current_limit) { 2111 ret = -EINVAL; 2112 goto out; 2113 } 2114 2115 ret = rdev->desc->ops->get_current_limit(rdev); 2116out: 2117 mutex_unlock(&rdev->mutex); 2118 return ret; 2119} 2120 2121/** 2122 * regulator_get_current_limit - get regulator output current 2123 * @regulator: regulator source 2124 * 2125 * This returns the current supplied by the specified current sink in uA. 2126 * 2127 * NOTE: If the regulator is disabled it will return the current value. This 2128 * function should not be used to determine regulator state. 2129 */ 2130int regulator_get_current_limit(struct regulator *regulator) 2131{ 2132 return _regulator_get_current_limit(regulator->rdev); 2133} 2134EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2135 2136/** 2137 * regulator_set_mode - set regulator operating mode 2138 * @regulator: regulator source 2139 * @mode: operating mode - one of the REGULATOR_MODE constants 2140 * 2141 * Set regulator operating mode to increase regulator efficiency or improve 2142 * regulation performance. 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_mode(struct regulator *regulator, unsigned int mode) 2148{ 2149 struct regulator_dev *rdev = regulator->rdev; 2150 int ret; 2151 int regulator_curr_mode; 2152 2153 mutex_lock(&rdev->mutex); 2154 2155 /* sanity check */ 2156 if (!rdev->desc->ops->set_mode) { 2157 ret = -EINVAL; 2158 goto out; 2159 } 2160 2161 /* return if the same mode is requested */ 2162 if (rdev->desc->ops->get_mode) { 2163 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2164 if (regulator_curr_mode == mode) { 2165 ret = 0; 2166 goto out; 2167 } 2168 } 2169 2170 /* constraints check */ 2171 ret = regulator_mode_constrain(rdev, &mode); 2172 if (ret < 0) 2173 goto out; 2174 2175 ret = rdev->desc->ops->set_mode(rdev, mode); 2176out: 2177 mutex_unlock(&rdev->mutex); 2178 return ret; 2179} 2180EXPORT_SYMBOL_GPL(regulator_set_mode); 2181 2182static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2183{ 2184 int ret; 2185 2186 mutex_lock(&rdev->mutex); 2187 2188 /* sanity check */ 2189 if (!rdev->desc->ops->get_mode) { 2190 ret = -EINVAL; 2191 goto out; 2192 } 2193 2194 ret = rdev->desc->ops->get_mode(rdev); 2195out: 2196 mutex_unlock(&rdev->mutex); 2197 return ret; 2198} 2199 2200/** 2201 * regulator_get_mode - get regulator operating mode 2202 * @regulator: regulator source 2203 * 2204 * Get the current regulator operating mode. 2205 */ 2206unsigned int regulator_get_mode(struct regulator *regulator) 2207{ 2208 return _regulator_get_mode(regulator->rdev); 2209} 2210EXPORT_SYMBOL_GPL(regulator_get_mode); 2211 2212/** 2213 * regulator_set_optimum_mode - set regulator optimum operating mode 2214 * @regulator: regulator source 2215 * @uA_load: load current 2216 * 2217 * Notifies the regulator core of a new device load. This is then used by 2218 * DRMS (if enabled by constraints) to set the most efficient regulator 2219 * operating mode for the new regulator loading. 2220 * 2221 * Consumer devices notify their supply regulator of the maximum power 2222 * they will require (can be taken from device datasheet in the power 2223 * consumption tables) when they change operational status and hence power 2224 * state. Examples of operational state changes that can affect power 2225 * consumption are :- 2226 * 2227 * o Device is opened / closed. 2228 * o Device I/O is about to begin or has just finished. 2229 * o Device is idling in between work. 2230 * 2231 * This information is also exported via sysfs to userspace. 2232 * 2233 * DRMS will sum the total requested load on the regulator and change 2234 * to the most efficient operating mode if platform constraints allow. 2235 * 2236 * Returns the new regulator mode or error. 2237 */ 2238int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2239{ 2240 struct regulator_dev *rdev = regulator->rdev; 2241 struct regulator *consumer; 2242 int ret, output_uV, input_uV, total_uA_load = 0; 2243 unsigned int mode; 2244 2245 mutex_lock(&rdev->mutex); 2246 2247 /* 2248 * first check to see if we can set modes at all, otherwise just 2249 * tell the consumer everything is OK. 2250 */ 2251 regulator->uA_load = uA_load; 2252 ret = regulator_check_drms(rdev); 2253 if (ret < 0) { 2254 ret = 0; 2255 goto out; 2256 } 2257 2258 if (!rdev->desc->ops->get_optimum_mode) 2259 goto out; 2260 2261 /* 2262 * we can actually do this so any errors are indicators of 2263 * potential real failure. 2264 */ 2265 ret = -EINVAL; 2266 2267 /* get output voltage */ 2268 output_uV = _regulator_get_voltage(rdev); 2269 if (output_uV <= 0) { 2270 rdev_err(rdev, "invalid output voltage found\n"); 2271 goto out; 2272 } 2273 2274 /* get input voltage */ 2275 input_uV = 0; 2276 if (rdev->supply) 2277 input_uV = regulator_get_voltage(rdev->supply); 2278 if (input_uV <= 0) 2279 input_uV = rdev->constraints->input_uV; 2280 if (input_uV <= 0) { 2281 rdev_err(rdev, "invalid input voltage found\n"); 2282 goto out; 2283 } 2284 2285 /* calc total requested load for this regulator */ 2286 list_for_each_entry(consumer, &rdev->consumer_list, list) 2287 total_uA_load += consumer->uA_load; 2288 2289 mode = rdev->desc->ops->get_optimum_mode(rdev, 2290 input_uV, output_uV, 2291 total_uA_load); 2292 ret = regulator_mode_constrain(rdev, &mode); 2293 if (ret < 0) { 2294 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2295 total_uA_load, input_uV, output_uV); 2296 goto out; 2297 } 2298 2299 ret = rdev->desc->ops->set_mode(rdev, mode); 2300 if (ret < 0) { 2301 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2302 goto out; 2303 } 2304 ret = mode; 2305out: 2306 mutex_unlock(&rdev->mutex); 2307 return ret; 2308} 2309EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2310 2311/** 2312 * regulator_register_notifier - register regulator event notifier 2313 * @regulator: regulator source 2314 * @nb: notifier block 2315 * 2316 * Register notifier block to receive regulator events. 2317 */ 2318int regulator_register_notifier(struct regulator *regulator, 2319 struct notifier_block *nb) 2320{ 2321 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2322 nb); 2323} 2324EXPORT_SYMBOL_GPL(regulator_register_notifier); 2325 2326/** 2327 * regulator_unregister_notifier - unregister regulator event notifier 2328 * @regulator: regulator source 2329 * @nb: notifier block 2330 * 2331 * Unregister regulator event notifier block. 2332 */ 2333int regulator_unregister_notifier(struct regulator *regulator, 2334 struct notifier_block *nb) 2335{ 2336 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2337 nb); 2338} 2339EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2340 2341/* notify regulator consumers and downstream regulator consumers. 2342 * Note mutex must be held by caller. 2343 */ 2344static void _notifier_call_chain(struct regulator_dev *rdev, 2345 unsigned long event, void *data) 2346{ 2347 /* call rdev chain first */ 2348 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2349} 2350 2351/** 2352 * regulator_bulk_get - get multiple regulator consumers 2353 * 2354 * @dev: Device to supply 2355 * @num_consumers: Number of consumers to register 2356 * @consumers: Configuration of consumers; clients are stored here. 2357 * 2358 * @return 0 on success, an errno on failure. 2359 * 2360 * This helper function allows drivers to get several regulator 2361 * consumers in one operation. If any of the regulators cannot be 2362 * acquired then any regulators that were allocated will be freed 2363 * before returning to the caller. 2364 */ 2365int regulator_bulk_get(struct device *dev, int num_consumers, 2366 struct regulator_bulk_data *consumers) 2367{ 2368 int i; 2369 int ret; 2370 2371 for (i = 0; i < num_consumers; i++) 2372 consumers[i].consumer = NULL; 2373 2374 for (i = 0; i < num_consumers; i++) { 2375 consumers[i].consumer = regulator_get(dev, 2376 consumers[i].supply); 2377 if (IS_ERR(consumers[i].consumer)) { 2378 ret = PTR_ERR(consumers[i].consumer); 2379 dev_err(dev, "Failed to get supply '%s': %d\n", 2380 consumers[i].supply, ret); 2381 consumers[i].consumer = NULL; 2382 goto err; 2383 } 2384 } 2385 2386 return 0; 2387 2388err: 2389 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2390 regulator_put(consumers[i].consumer); 2391 2392 return ret; 2393} 2394EXPORT_SYMBOL_GPL(regulator_bulk_get); 2395 2396static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2397{ 2398 struct regulator_bulk_data *bulk = data; 2399 2400 bulk->ret = regulator_enable(bulk->consumer); 2401} 2402 2403/** 2404 * regulator_bulk_enable - enable multiple regulator consumers 2405 * 2406 * @num_consumers: Number of consumers 2407 * @consumers: Consumer data; clients are stored here. 2408 * @return 0 on success, an errno on failure 2409 * 2410 * This convenience API allows consumers to enable multiple regulator 2411 * clients in a single API call. If any consumers cannot be enabled 2412 * then any others that were enabled will be disabled again prior to 2413 * return. 2414 */ 2415int regulator_bulk_enable(int num_consumers, 2416 struct regulator_bulk_data *consumers) 2417{ 2418 LIST_HEAD(async_domain); 2419 int i; 2420 int ret = 0; 2421 2422 for (i = 0; i < num_consumers; i++) 2423 async_schedule_domain(regulator_bulk_enable_async, 2424 &consumers[i], &async_domain); 2425 2426 async_synchronize_full_domain(&async_domain); 2427 2428 /* If any consumer failed we need to unwind any that succeeded */ 2429 for (i = 0; i < num_consumers; i++) { 2430 if (consumers[i].ret != 0) { 2431 ret = consumers[i].ret; 2432 goto err; 2433 } 2434 } 2435 2436 return 0; 2437 2438err: 2439 for (i = 0; i < num_consumers; i++) 2440 if (consumers[i].ret == 0) 2441 regulator_disable(consumers[i].consumer); 2442 else 2443 pr_err("Failed to enable %s: %d\n", 2444 consumers[i].supply, consumers[i].ret); 2445 2446 return ret; 2447} 2448EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2449 2450/** 2451 * regulator_bulk_disable - disable multiple regulator consumers 2452 * 2453 * @num_consumers: Number of consumers 2454 * @consumers: Consumer data; clients are stored here. 2455 * @return 0 on success, an errno on failure 2456 * 2457 * This convenience API allows consumers to disable multiple regulator 2458 * clients in a single API call. If any consumers cannot be enabled 2459 * then any others that were disabled will be disabled again prior to 2460 * return. 2461 */ 2462int regulator_bulk_disable(int num_consumers, 2463 struct regulator_bulk_data *consumers) 2464{ 2465 int i; 2466 int ret; 2467 2468 for (i = 0; i < num_consumers; i++) { 2469 ret = regulator_disable(consumers[i].consumer); 2470 if (ret != 0) 2471 goto err; 2472 } 2473 2474 return 0; 2475 2476err: 2477 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2478 for (--i; i >= 0; --i) 2479 regulator_enable(consumers[i].consumer); 2480 2481 return ret; 2482} 2483EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2484 2485/** 2486 * regulator_bulk_force_disable - force disable multiple regulator consumers 2487 * 2488 * @num_consumers: Number of consumers 2489 * @consumers: Consumer data; clients are stored here. 2490 * @return 0 on success, an errno on failure 2491 * 2492 * This convenience API allows consumers to forcibly disable multiple regulator 2493 * clients in a single API call. 2494 * NOTE: This should be used for situations when device damage will 2495 * likely occur if the regulators are not disabled (e.g. over temp). 2496 * Although regulator_force_disable function call for some consumers can 2497 * return error numbers, the function is called for all consumers. 2498 */ 2499int regulator_bulk_force_disable(int num_consumers, 2500 struct regulator_bulk_data *consumers) 2501{ 2502 int i; 2503 int ret; 2504 2505 for (i = 0; i < num_consumers; i++) 2506 consumers[i].ret = 2507 regulator_force_disable(consumers[i].consumer); 2508 2509 for (i = 0; i < num_consumers; i++) { 2510 if (consumers[i].ret != 0) { 2511 ret = consumers[i].ret; 2512 goto out; 2513 } 2514 } 2515 2516 return 0; 2517out: 2518 return ret; 2519} 2520EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2521 2522/** 2523 * regulator_bulk_free - free multiple regulator consumers 2524 * 2525 * @num_consumers: Number of consumers 2526 * @consumers: Consumer data; clients are stored here. 2527 * 2528 * This convenience API allows consumers to free multiple regulator 2529 * clients in a single API call. 2530 */ 2531void regulator_bulk_free(int num_consumers, 2532 struct regulator_bulk_data *consumers) 2533{ 2534 int i; 2535 2536 for (i = 0; i < num_consumers; i++) { 2537 regulator_put(consumers[i].consumer); 2538 consumers[i].consumer = NULL; 2539 } 2540} 2541EXPORT_SYMBOL_GPL(regulator_bulk_free); 2542 2543/** 2544 * regulator_notifier_call_chain - call regulator event notifier 2545 * @rdev: regulator source 2546 * @event: notifier block 2547 * @data: callback-specific data. 2548 * 2549 * Called by regulator drivers to notify clients a regulator event has 2550 * occurred. We also notify regulator clients downstream. 2551 * Note lock must be held by caller. 2552 */ 2553int regulator_notifier_call_chain(struct regulator_dev *rdev, 2554 unsigned long event, void *data) 2555{ 2556 _notifier_call_chain(rdev, event, data); 2557 return NOTIFY_DONE; 2558 2559} 2560EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2561 2562/** 2563 * regulator_mode_to_status - convert a regulator mode into a status 2564 * 2565 * @mode: Mode to convert 2566 * 2567 * Convert a regulator mode into a status. 2568 */ 2569int regulator_mode_to_status(unsigned int mode) 2570{ 2571 switch (mode) { 2572 case REGULATOR_MODE_FAST: 2573 return REGULATOR_STATUS_FAST; 2574 case REGULATOR_MODE_NORMAL: 2575 return REGULATOR_STATUS_NORMAL; 2576 case REGULATOR_MODE_IDLE: 2577 return REGULATOR_STATUS_IDLE; 2578 case REGULATOR_STATUS_STANDBY: 2579 return REGULATOR_STATUS_STANDBY; 2580 default: 2581 return 0; 2582 } 2583} 2584EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2585 2586/* 2587 * To avoid cluttering sysfs (and memory) with useless state, only 2588 * create attributes that can be meaningfully displayed. 2589 */ 2590static int add_regulator_attributes(struct regulator_dev *rdev) 2591{ 2592 struct device *dev = &rdev->dev; 2593 struct regulator_ops *ops = rdev->desc->ops; 2594 int status = 0; 2595 2596 /* some attributes need specific methods to be displayed */ 2597 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2598 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2599 status = device_create_file(dev, &dev_attr_microvolts); 2600 if (status < 0) 2601 return status; 2602 } 2603 if (ops->get_current_limit) { 2604 status = device_create_file(dev, &dev_attr_microamps); 2605 if (status < 0) 2606 return status; 2607 } 2608 if (ops->get_mode) { 2609 status = device_create_file(dev, &dev_attr_opmode); 2610 if (status < 0) 2611 return status; 2612 } 2613 if (ops->is_enabled) { 2614 status = device_create_file(dev, &dev_attr_state); 2615 if (status < 0) 2616 return status; 2617 } 2618 if (ops->get_status) { 2619 status = device_create_file(dev, &dev_attr_status); 2620 if (status < 0) 2621 return status; 2622 } 2623 2624 /* some attributes are type-specific */ 2625 if (rdev->desc->type == REGULATOR_CURRENT) { 2626 status = device_create_file(dev, &dev_attr_requested_microamps); 2627 if (status < 0) 2628 return status; 2629 } 2630 2631 /* all the other attributes exist to support constraints; 2632 * don't show them if there are no constraints, or if the 2633 * relevant supporting methods are missing. 2634 */ 2635 if (!rdev->constraints) 2636 return status; 2637 2638 /* constraints need specific supporting methods */ 2639 if (ops->set_voltage || ops->set_voltage_sel) { 2640 status = device_create_file(dev, &dev_attr_min_microvolts); 2641 if (status < 0) 2642 return status; 2643 status = device_create_file(dev, &dev_attr_max_microvolts); 2644 if (status < 0) 2645 return status; 2646 } 2647 if (ops->set_current_limit) { 2648 status = device_create_file(dev, &dev_attr_min_microamps); 2649 if (status < 0) 2650 return status; 2651 status = device_create_file(dev, &dev_attr_max_microamps); 2652 if (status < 0) 2653 return status; 2654 } 2655 2656 /* suspend mode constraints need multiple supporting methods */ 2657 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2658 return status; 2659 2660 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2661 if (status < 0) 2662 return status; 2663 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2664 if (status < 0) 2665 return status; 2666 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2667 if (status < 0) 2668 return status; 2669 2670 if (ops->set_suspend_voltage) { 2671 status = device_create_file(dev, 2672 &dev_attr_suspend_standby_microvolts); 2673 if (status < 0) 2674 return status; 2675 status = device_create_file(dev, 2676 &dev_attr_suspend_mem_microvolts); 2677 if (status < 0) 2678 return status; 2679 status = device_create_file(dev, 2680 &dev_attr_suspend_disk_microvolts); 2681 if (status < 0) 2682 return status; 2683 } 2684 2685 if (ops->set_suspend_mode) { 2686 status = device_create_file(dev, 2687 &dev_attr_suspend_standby_mode); 2688 if (status < 0) 2689 return status; 2690 status = device_create_file(dev, 2691 &dev_attr_suspend_mem_mode); 2692 if (status < 0) 2693 return status; 2694 status = device_create_file(dev, 2695 &dev_attr_suspend_disk_mode); 2696 if (status < 0) 2697 return status; 2698 } 2699 2700 return status; 2701} 2702 2703static void rdev_init_debugfs(struct regulator_dev *rdev) 2704{ 2705#ifdef CONFIG_DEBUG_FS 2706 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2707 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2708 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2709 rdev->debugfs = NULL; 2710 return; 2711 } 2712 2713 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2714 &rdev->use_count); 2715 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2716 &rdev->open_count); 2717#endif 2718} 2719 2720/** 2721 * regulator_register - register regulator 2722 * @regulator_desc: regulator to register 2723 * @dev: struct device for the regulator 2724 * @init_data: platform provided init data, passed through by driver 2725 * @driver_data: private regulator data 2726 * @of_node: OpenFirmware node to parse for device tree bindings (may be 2727 * NULL). 2728 * 2729 * Called by regulator drivers to register a regulator. 2730 * Returns 0 on success. 2731 */ 2732struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2733 struct device *dev, const struct regulator_init_data *init_data, 2734 void *driver_data, struct device_node *of_node) 2735{ 2736 const struct regulation_constraints *constraints = NULL; 2737 static atomic_t regulator_no = ATOMIC_INIT(0); 2738 struct regulator_dev *rdev; 2739 int ret, i; 2740 const char *supply = NULL; 2741 2742 if (regulator_desc == NULL) 2743 return ERR_PTR(-EINVAL); 2744 2745 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2746 return ERR_PTR(-EINVAL); 2747 2748 if (regulator_desc->type != REGULATOR_VOLTAGE && 2749 regulator_desc->type != REGULATOR_CURRENT) 2750 return ERR_PTR(-EINVAL); 2751 2752 /* Only one of each should be implemented */ 2753 WARN_ON(regulator_desc->ops->get_voltage && 2754 regulator_desc->ops->get_voltage_sel); 2755 WARN_ON(regulator_desc->ops->set_voltage && 2756 regulator_desc->ops->set_voltage_sel); 2757 2758 /* If we're using selectors we must implement list_voltage. */ 2759 if (regulator_desc->ops->get_voltage_sel && 2760 !regulator_desc->ops->list_voltage) { 2761 return ERR_PTR(-EINVAL); 2762 } 2763 if (regulator_desc->ops->set_voltage_sel && 2764 !regulator_desc->ops->list_voltage) { 2765 return ERR_PTR(-EINVAL); 2766 } 2767 2768 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2769 if (rdev == NULL) 2770 return ERR_PTR(-ENOMEM); 2771 2772 mutex_lock(®ulator_list_mutex); 2773 2774 mutex_init(&rdev->mutex); 2775 rdev->reg_data = driver_data; 2776 rdev->owner = regulator_desc->owner; 2777 rdev->desc = regulator_desc; 2778 INIT_LIST_HEAD(&rdev->consumer_list); 2779 INIT_LIST_HEAD(&rdev->list); 2780 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2781 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2782 2783 /* preform any regulator specific init */ 2784 if (init_data && init_data->regulator_init) { 2785 ret = init_data->regulator_init(rdev->reg_data); 2786 if (ret < 0) 2787 goto clean; 2788 } 2789 2790 /* register with sysfs */ 2791 rdev->dev.class = ®ulator_class; 2792 rdev->dev.of_node = of_node; 2793 rdev->dev.parent = dev; 2794 dev_set_name(&rdev->dev, "regulator.%d", 2795 atomic_inc_return(®ulator_no) - 1); 2796 ret = device_register(&rdev->dev); 2797 if (ret != 0) { 2798 put_device(&rdev->dev); 2799 goto clean; 2800 } 2801 2802 dev_set_drvdata(&rdev->dev, rdev); 2803 2804 /* set regulator constraints */ 2805 if (init_data) 2806 constraints = &init_data->constraints; 2807 2808 ret = set_machine_constraints(rdev, constraints); 2809 if (ret < 0) 2810 goto scrub; 2811 2812 /* add attributes supported by this regulator */ 2813 ret = add_regulator_attributes(rdev); 2814 if (ret < 0) 2815 goto scrub; 2816 2817 if (init_data && init_data->supply_regulator) 2818 supply = init_data->supply_regulator; 2819 else if (regulator_desc->supply_name) 2820 supply = regulator_desc->supply_name; 2821 2822 if (supply) { 2823 struct regulator_dev *r; 2824 2825 r = regulator_dev_lookup(dev, supply); 2826 2827 if (!r) { 2828 dev_err(dev, "Failed to find supply %s\n", supply); 2829 ret = -ENODEV; 2830 goto scrub; 2831 } 2832 2833 ret = set_supply(rdev, r); 2834 if (ret < 0) 2835 goto scrub; 2836 2837 /* Enable supply if rail is enabled */ 2838 if (rdev->desc->ops->is_enabled && 2839 rdev->desc->ops->is_enabled(rdev)) { 2840 ret = regulator_enable(rdev->supply); 2841 if (ret < 0) 2842 goto scrub; 2843 } 2844 } 2845 2846 /* add consumers devices */ 2847 if (init_data) { 2848 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2849 ret = set_consumer_device_supply(rdev, 2850 init_data->consumer_supplies[i].dev_name, 2851 init_data->consumer_supplies[i].supply); 2852 if (ret < 0) { 2853 dev_err(dev, "Failed to set supply %s\n", 2854 init_data->consumer_supplies[i].supply); 2855 goto unset_supplies; 2856 } 2857 } 2858 } 2859 2860 list_add(&rdev->list, ®ulator_list); 2861 2862 rdev_init_debugfs(rdev); 2863out: 2864 mutex_unlock(®ulator_list_mutex); 2865 return rdev; 2866 2867unset_supplies: 2868 unset_regulator_supplies(rdev); 2869 2870scrub: 2871 kfree(rdev->constraints); 2872 device_unregister(&rdev->dev); 2873 /* device core frees rdev */ 2874 rdev = ERR_PTR(ret); 2875 goto out; 2876 2877clean: 2878 kfree(rdev); 2879 rdev = ERR_PTR(ret); 2880 goto out; 2881} 2882EXPORT_SYMBOL_GPL(regulator_register); 2883 2884/** 2885 * regulator_unregister - unregister regulator 2886 * @rdev: regulator to unregister 2887 * 2888 * Called by regulator drivers to unregister a regulator. 2889 */ 2890void regulator_unregister(struct regulator_dev *rdev) 2891{ 2892 if (rdev == NULL) 2893 return; 2894 2895 mutex_lock(®ulator_list_mutex); 2896#ifdef CONFIG_DEBUG_FS 2897 debugfs_remove_recursive(rdev->debugfs); 2898#endif 2899 flush_work_sync(&rdev->disable_work.work); 2900 WARN_ON(rdev->open_count); 2901 unset_regulator_supplies(rdev); 2902 list_del(&rdev->list); 2903 if (rdev->supply) 2904 regulator_put(rdev->supply); 2905 kfree(rdev->constraints); 2906 device_unregister(&rdev->dev); 2907 mutex_unlock(®ulator_list_mutex); 2908} 2909EXPORT_SYMBOL_GPL(regulator_unregister); 2910 2911/** 2912 * regulator_suspend_prepare - prepare regulators for system wide suspend 2913 * @state: system suspend state 2914 * 2915 * Configure each regulator with it's suspend operating parameters for state. 2916 * This will usually be called by machine suspend code prior to supending. 2917 */ 2918int regulator_suspend_prepare(suspend_state_t state) 2919{ 2920 struct regulator_dev *rdev; 2921 int ret = 0; 2922 2923 /* ON is handled by regulator active state */ 2924 if (state == PM_SUSPEND_ON) 2925 return -EINVAL; 2926 2927 mutex_lock(®ulator_list_mutex); 2928 list_for_each_entry(rdev, ®ulator_list, list) { 2929 2930 mutex_lock(&rdev->mutex); 2931 ret = suspend_prepare(rdev, state); 2932 mutex_unlock(&rdev->mutex); 2933 2934 if (ret < 0) { 2935 rdev_err(rdev, "failed to prepare\n"); 2936 goto out; 2937 } 2938 } 2939out: 2940 mutex_unlock(®ulator_list_mutex); 2941 return ret; 2942} 2943EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2944 2945/** 2946 * regulator_suspend_finish - resume regulators from system wide suspend 2947 * 2948 * Turn on regulators that might be turned off by regulator_suspend_prepare 2949 * and that should be turned on according to the regulators properties. 2950 */ 2951int regulator_suspend_finish(void) 2952{ 2953 struct regulator_dev *rdev; 2954 int ret = 0, error; 2955 2956 mutex_lock(®ulator_list_mutex); 2957 list_for_each_entry(rdev, ®ulator_list, list) { 2958 struct regulator_ops *ops = rdev->desc->ops; 2959 2960 mutex_lock(&rdev->mutex); 2961 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 2962 ops->enable) { 2963 error = ops->enable(rdev); 2964 if (error) 2965 ret = error; 2966 } else { 2967 if (!has_full_constraints) 2968 goto unlock; 2969 if (!ops->disable) 2970 goto unlock; 2971 if (ops->is_enabled && !ops->is_enabled(rdev)) 2972 goto unlock; 2973 2974 error = ops->disable(rdev); 2975 if (error) 2976 ret = error; 2977 } 2978unlock: 2979 mutex_unlock(&rdev->mutex); 2980 } 2981 mutex_unlock(®ulator_list_mutex); 2982 return ret; 2983} 2984EXPORT_SYMBOL_GPL(regulator_suspend_finish); 2985 2986/** 2987 * regulator_has_full_constraints - the system has fully specified constraints 2988 * 2989 * Calling this function will cause the regulator API to disable all 2990 * regulators which have a zero use count and don't have an always_on 2991 * constraint in a late_initcall. 2992 * 2993 * The intention is that this will become the default behaviour in a 2994 * future kernel release so users are encouraged to use this facility 2995 * now. 2996 */ 2997void regulator_has_full_constraints(void) 2998{ 2999 has_full_constraints = 1; 3000} 3001EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3002 3003/** 3004 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3005 * 3006 * Calling this function will cause the regulator API to provide a 3007 * dummy regulator to consumers if no physical regulator is found, 3008 * allowing most consumers to proceed as though a regulator were 3009 * configured. This allows systems such as those with software 3010 * controllable regulators for the CPU core only to be brought up more 3011 * readily. 3012 */ 3013void regulator_use_dummy_regulator(void) 3014{ 3015 board_wants_dummy_regulator = true; 3016} 3017EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3018 3019/** 3020 * rdev_get_drvdata - get rdev regulator driver data 3021 * @rdev: regulator 3022 * 3023 * Get rdev regulator driver private data. This call can be used in the 3024 * regulator driver context. 3025 */ 3026void *rdev_get_drvdata(struct regulator_dev *rdev) 3027{ 3028 return rdev->reg_data; 3029} 3030EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3031 3032/** 3033 * regulator_get_drvdata - get regulator driver data 3034 * @regulator: regulator 3035 * 3036 * Get regulator driver private data. This call can be used in the consumer 3037 * driver context when non API regulator specific functions need to be called. 3038 */ 3039void *regulator_get_drvdata(struct regulator *regulator) 3040{ 3041 return regulator->rdev->reg_data; 3042} 3043EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3044 3045/** 3046 * regulator_set_drvdata - set regulator driver data 3047 * @regulator: regulator 3048 * @data: data 3049 */ 3050void regulator_set_drvdata(struct regulator *regulator, void *data) 3051{ 3052 regulator->rdev->reg_data = data; 3053} 3054EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3055 3056/** 3057 * regulator_get_id - get regulator ID 3058 * @rdev: regulator 3059 */ 3060int rdev_get_id(struct regulator_dev *rdev) 3061{ 3062 return rdev->desc->id; 3063} 3064EXPORT_SYMBOL_GPL(rdev_get_id); 3065 3066struct device *rdev_get_dev(struct regulator_dev *rdev) 3067{ 3068 return &rdev->dev; 3069} 3070EXPORT_SYMBOL_GPL(rdev_get_dev); 3071 3072void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3073{ 3074 return reg_init_data->driver_data; 3075} 3076EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3077 3078#ifdef CONFIG_DEBUG_FS 3079static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3080 size_t count, loff_t *ppos) 3081{ 3082 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3083 ssize_t len, ret = 0; 3084 struct regulator_map *map; 3085 3086 if (!buf) 3087 return -ENOMEM; 3088 3089 list_for_each_entry(map, ®ulator_map_list, list) { 3090 len = snprintf(buf + ret, PAGE_SIZE - ret, 3091 "%s -> %s.%s\n", 3092 rdev_get_name(map->regulator), map->dev_name, 3093 map->supply); 3094 if (len >= 0) 3095 ret += len; 3096 if (ret > PAGE_SIZE) { 3097 ret = PAGE_SIZE; 3098 break; 3099 } 3100 } 3101 3102 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3103 3104 kfree(buf); 3105 3106 return ret; 3107} 3108 3109static const struct file_operations supply_map_fops = { 3110 .read = supply_map_read_file, 3111 .llseek = default_llseek, 3112}; 3113#endif 3114 3115static int __init regulator_init(void) 3116{ 3117 int ret; 3118 3119 ret = class_register(®ulator_class); 3120 3121#ifdef CONFIG_DEBUG_FS 3122 debugfs_root = debugfs_create_dir("regulator", NULL); 3123 if (IS_ERR(debugfs_root) || !debugfs_root) { 3124 pr_warn("regulator: Failed to create debugfs directory\n"); 3125 debugfs_root = NULL; 3126 } 3127 3128 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3129 NULL, &supply_map_fops))) 3130 pr_warn("regulator: Failed to create supplies debugfs\n"); 3131#endif 3132 3133 regulator_dummy_init(); 3134 3135 return ret; 3136} 3137 3138/* init early to allow our consumers to complete system booting */ 3139core_initcall(regulator_init); 3140 3141static int __init regulator_init_complete(void) 3142{ 3143 struct regulator_dev *rdev; 3144 struct regulator_ops *ops; 3145 struct regulation_constraints *c; 3146 int enabled, ret; 3147 3148 mutex_lock(®ulator_list_mutex); 3149 3150 /* If we have a full configuration then disable any regulators 3151 * which are not in use or always_on. This will become the 3152 * default behaviour in the future. 3153 */ 3154 list_for_each_entry(rdev, ®ulator_list, list) { 3155 ops = rdev->desc->ops; 3156 c = rdev->constraints; 3157 3158 if (!ops->disable || (c && c->always_on)) 3159 continue; 3160 3161 mutex_lock(&rdev->mutex); 3162 3163 if (rdev->use_count) 3164 goto unlock; 3165 3166 /* If we can't read the status assume it's on. */ 3167 if (ops->is_enabled) 3168 enabled = ops->is_enabled(rdev); 3169 else 3170 enabled = 1; 3171 3172 if (!enabled) 3173 goto unlock; 3174 3175 if (has_full_constraints) { 3176 /* We log since this may kill the system if it 3177 * goes wrong. */ 3178 rdev_info(rdev, "disabling\n"); 3179 ret = ops->disable(rdev); 3180 if (ret != 0) { 3181 rdev_err(rdev, "couldn't disable: %d\n", ret); 3182 } 3183 } else { 3184 /* The intention is that in future we will 3185 * assume that full constraints are provided 3186 * so warn even if we aren't going to do 3187 * anything here. 3188 */ 3189 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3190 } 3191 3192unlock: 3193 mutex_unlock(&rdev->mutex); 3194 } 3195 3196 mutex_unlock(®ulator_list_mutex); 3197 3198 return 0; 3199} 3200late_initcall(regulator_init_complete); 3201