core.c revision 9a8f5e07200dd80fe5979490c36b62f64f70825b
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#define pr_fmt(fmt) "%s: " fmt, __func__ 17 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/debugfs.h> 21#include <linux/device.h> 22#include <linux/slab.h> 23#include <linux/async.h> 24#include <linux/err.h> 25#include <linux/mutex.h> 26#include <linux/suspend.h> 27#include <linux/delay.h> 28#include <linux/of.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static bool has_full_constraints; 55static bool board_wants_dummy_regulator; 56 57#ifdef CONFIG_DEBUG_FS 58static struct dentry *debugfs_root; 59#endif 60 61/* 62 * struct regulator_map 63 * 64 * Used to provide symbolic supply names to devices. 65 */ 66struct regulator_map { 67 struct list_head list; 68 const char *dev_name; /* The dev_name() for the consumer */ 69 const char *supply; 70 struct regulator_dev *regulator; 71}; 72 73/* 74 * struct regulator 75 * 76 * One for each consumer device. 77 */ 78struct regulator { 79 struct device *dev; 80 struct list_head list; 81 int uA_load; 82 int min_uV; 83 int max_uV; 84 char *supply_name; 85 struct device_attribute dev_attr; 86 struct regulator_dev *rdev; 87#ifdef CONFIG_DEBUG_FS 88 struct dentry *debugfs; 89#endif 90}; 91 92static int _regulator_is_enabled(struct regulator_dev *rdev); 93static int _regulator_disable(struct regulator_dev *rdev); 94static int _regulator_get_voltage(struct regulator_dev *rdev); 95static int _regulator_get_current_limit(struct regulator_dev *rdev); 96static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 97static void _notifier_call_chain(struct regulator_dev *rdev, 98 unsigned long event, void *data); 99static int _regulator_do_set_voltage(struct regulator_dev *rdev, 100 int min_uV, int max_uV); 101static struct regulator *create_regulator(struct regulator_dev *rdev, 102 struct device *dev, 103 const char *supply_name); 104 105static const char *rdev_get_name(struct regulator_dev *rdev) 106{ 107 if (rdev->constraints && rdev->constraints->name) 108 return rdev->constraints->name; 109 else if (rdev->desc->name) 110 return rdev->desc->name; 111 else 112 return ""; 113} 114 115/* gets the regulator for a given consumer device */ 116static struct regulator *get_device_regulator(struct device *dev) 117{ 118 struct regulator *regulator = NULL; 119 struct regulator_dev *rdev; 120 121 mutex_lock(®ulator_list_mutex); 122 list_for_each_entry(rdev, ®ulator_list, list) { 123 mutex_lock(&rdev->mutex); 124 list_for_each_entry(regulator, &rdev->consumer_list, list) { 125 if (regulator->dev == dev) { 126 mutex_unlock(&rdev->mutex); 127 mutex_unlock(®ulator_list_mutex); 128 return regulator; 129 } 130 } 131 mutex_unlock(&rdev->mutex); 132 } 133 mutex_unlock(®ulator_list_mutex); 134 return NULL; 135} 136 137/** 138 * of_get_regulator - get a regulator device node based on supply name 139 * @dev: Device pointer for the consumer (of regulator) device 140 * @supply: regulator supply name 141 * 142 * Extract the regulator device node corresponding to the supply name. 143 * retruns the device node corresponding to the regulator if found, else 144 * returns NULL. 145 */ 146static struct device_node *of_get_regulator(struct device *dev, const char *supply) 147{ 148 struct device_node *regnode = NULL; 149 char prop_name[32]; /* 32 is max size of property name */ 150 151 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 152 153 snprintf(prop_name, 32, "%s-supply", supply); 154 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 155 156 if (!regnode) { 157 dev_warn(dev, "%s property in node %s references invalid phandle", 158 prop_name, dev->of_node->full_name); 159 return NULL; 160 } 161 return regnode; 162} 163 164/* Platform voltage constraint check */ 165static int regulator_check_voltage(struct regulator_dev *rdev, 166 int *min_uV, int *max_uV) 167{ 168 BUG_ON(*min_uV > *max_uV); 169 170 if (!rdev->constraints) { 171 rdev_err(rdev, "no constraints\n"); 172 return -ENODEV; 173 } 174 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 175 rdev_err(rdev, "operation not allowed\n"); 176 return -EPERM; 177 } 178 179 if (*max_uV > rdev->constraints->max_uV) 180 *max_uV = rdev->constraints->max_uV; 181 if (*min_uV < rdev->constraints->min_uV) 182 *min_uV = rdev->constraints->min_uV; 183 184 if (*min_uV > *max_uV) { 185 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 186 *min_uV, *max_uV); 187 return -EINVAL; 188 } 189 190 return 0; 191} 192 193/* Make sure we select a voltage that suits the needs of all 194 * regulator consumers 195 */ 196static int regulator_check_consumers(struct regulator_dev *rdev, 197 int *min_uV, int *max_uV) 198{ 199 struct regulator *regulator; 200 201 list_for_each_entry(regulator, &rdev->consumer_list, list) { 202 /* 203 * Assume consumers that didn't say anything are OK 204 * with anything in the constraint range. 205 */ 206 if (!regulator->min_uV && !regulator->max_uV) 207 continue; 208 209 if (*max_uV > regulator->max_uV) 210 *max_uV = regulator->max_uV; 211 if (*min_uV < regulator->min_uV) 212 *min_uV = regulator->min_uV; 213 } 214 215 if (*min_uV > *max_uV) 216 return -EINVAL; 217 218 return 0; 219} 220 221/* current constraint check */ 222static int regulator_check_current_limit(struct regulator_dev *rdev, 223 int *min_uA, int *max_uA) 224{ 225 BUG_ON(*min_uA > *max_uA); 226 227 if (!rdev->constraints) { 228 rdev_err(rdev, "no constraints\n"); 229 return -ENODEV; 230 } 231 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 232 rdev_err(rdev, "operation not allowed\n"); 233 return -EPERM; 234 } 235 236 if (*max_uA > rdev->constraints->max_uA) 237 *max_uA = rdev->constraints->max_uA; 238 if (*min_uA < rdev->constraints->min_uA) 239 *min_uA = rdev->constraints->min_uA; 240 241 if (*min_uA > *max_uA) { 242 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 243 *min_uA, *max_uA); 244 return -EINVAL; 245 } 246 247 return 0; 248} 249 250/* operating mode constraint check */ 251static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 252{ 253 switch (*mode) { 254 case REGULATOR_MODE_FAST: 255 case REGULATOR_MODE_NORMAL: 256 case REGULATOR_MODE_IDLE: 257 case REGULATOR_MODE_STANDBY: 258 break; 259 default: 260 rdev_err(rdev, "invalid mode %x specified\n", *mode); 261 return -EINVAL; 262 } 263 264 if (!rdev->constraints) { 265 rdev_err(rdev, "no constraints\n"); 266 return -ENODEV; 267 } 268 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 269 rdev_err(rdev, "operation not allowed\n"); 270 return -EPERM; 271 } 272 273 /* The modes are bitmasks, the most power hungry modes having 274 * the lowest values. If the requested mode isn't supported 275 * try higher modes. */ 276 while (*mode) { 277 if (rdev->constraints->valid_modes_mask & *mode) 278 return 0; 279 *mode /= 2; 280 } 281 282 return -EINVAL; 283} 284 285/* dynamic regulator mode switching constraint check */ 286static int regulator_check_drms(struct regulator_dev *rdev) 287{ 288 if (!rdev->constraints) { 289 rdev_err(rdev, "no constraints\n"); 290 return -ENODEV; 291 } 292 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 293 rdev_err(rdev, "operation not allowed\n"); 294 return -EPERM; 295 } 296 return 0; 297} 298 299static ssize_t device_requested_uA_show(struct device *dev, 300 struct device_attribute *attr, char *buf) 301{ 302 struct regulator *regulator; 303 304 regulator = get_device_regulator(dev); 305 if (regulator == NULL) 306 return 0; 307 308 return sprintf(buf, "%d\n", regulator->uA_load); 309} 310 311static ssize_t regulator_uV_show(struct device *dev, 312 struct device_attribute *attr, char *buf) 313{ 314 struct regulator_dev *rdev = dev_get_drvdata(dev); 315 ssize_t ret; 316 317 mutex_lock(&rdev->mutex); 318 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 319 mutex_unlock(&rdev->mutex); 320 321 return ret; 322} 323static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 324 325static ssize_t regulator_uA_show(struct device *dev, 326 struct device_attribute *attr, char *buf) 327{ 328 struct regulator_dev *rdev = dev_get_drvdata(dev); 329 330 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 331} 332static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 333 334static ssize_t regulator_name_show(struct device *dev, 335 struct device_attribute *attr, char *buf) 336{ 337 struct regulator_dev *rdev = dev_get_drvdata(dev); 338 339 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 340} 341 342static ssize_t regulator_print_opmode(char *buf, int mode) 343{ 344 switch (mode) { 345 case REGULATOR_MODE_FAST: 346 return sprintf(buf, "fast\n"); 347 case REGULATOR_MODE_NORMAL: 348 return sprintf(buf, "normal\n"); 349 case REGULATOR_MODE_IDLE: 350 return sprintf(buf, "idle\n"); 351 case REGULATOR_MODE_STANDBY: 352 return sprintf(buf, "standby\n"); 353 } 354 return sprintf(buf, "unknown\n"); 355} 356 357static ssize_t regulator_opmode_show(struct device *dev, 358 struct device_attribute *attr, char *buf) 359{ 360 struct regulator_dev *rdev = dev_get_drvdata(dev); 361 362 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 363} 364static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 365 366static ssize_t regulator_print_state(char *buf, int state) 367{ 368 if (state > 0) 369 return sprintf(buf, "enabled\n"); 370 else if (state == 0) 371 return sprintf(buf, "disabled\n"); 372 else 373 return sprintf(buf, "unknown\n"); 374} 375 376static ssize_t regulator_state_show(struct device *dev, 377 struct device_attribute *attr, char *buf) 378{ 379 struct regulator_dev *rdev = dev_get_drvdata(dev); 380 ssize_t ret; 381 382 mutex_lock(&rdev->mutex); 383 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 384 mutex_unlock(&rdev->mutex); 385 386 return ret; 387} 388static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 389 390static ssize_t regulator_status_show(struct device *dev, 391 struct device_attribute *attr, char *buf) 392{ 393 struct regulator_dev *rdev = dev_get_drvdata(dev); 394 int status; 395 char *label; 396 397 status = rdev->desc->ops->get_status(rdev); 398 if (status < 0) 399 return status; 400 401 switch (status) { 402 case REGULATOR_STATUS_OFF: 403 label = "off"; 404 break; 405 case REGULATOR_STATUS_ON: 406 label = "on"; 407 break; 408 case REGULATOR_STATUS_ERROR: 409 label = "error"; 410 break; 411 case REGULATOR_STATUS_FAST: 412 label = "fast"; 413 break; 414 case REGULATOR_STATUS_NORMAL: 415 label = "normal"; 416 break; 417 case REGULATOR_STATUS_IDLE: 418 label = "idle"; 419 break; 420 case REGULATOR_STATUS_STANDBY: 421 label = "standby"; 422 break; 423 default: 424 return -ERANGE; 425 } 426 427 return sprintf(buf, "%s\n", label); 428} 429static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 430 431static ssize_t regulator_min_uA_show(struct device *dev, 432 struct device_attribute *attr, char *buf) 433{ 434 struct regulator_dev *rdev = dev_get_drvdata(dev); 435 436 if (!rdev->constraints) 437 return sprintf(buf, "constraint not defined\n"); 438 439 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 440} 441static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 442 443static ssize_t regulator_max_uA_show(struct device *dev, 444 struct device_attribute *attr, char *buf) 445{ 446 struct regulator_dev *rdev = dev_get_drvdata(dev); 447 448 if (!rdev->constraints) 449 return sprintf(buf, "constraint not defined\n"); 450 451 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 452} 453static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 454 455static ssize_t regulator_min_uV_show(struct device *dev, 456 struct device_attribute *attr, char *buf) 457{ 458 struct regulator_dev *rdev = dev_get_drvdata(dev); 459 460 if (!rdev->constraints) 461 return sprintf(buf, "constraint not defined\n"); 462 463 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 464} 465static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 466 467static ssize_t regulator_max_uV_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 472 if (!rdev->constraints) 473 return sprintf(buf, "constraint not defined\n"); 474 475 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 476} 477static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 478 479static ssize_t regulator_total_uA_show(struct device *dev, 480 struct device_attribute *attr, char *buf) 481{ 482 struct regulator_dev *rdev = dev_get_drvdata(dev); 483 struct regulator *regulator; 484 int uA = 0; 485 486 mutex_lock(&rdev->mutex); 487 list_for_each_entry(regulator, &rdev->consumer_list, list) 488 uA += regulator->uA_load; 489 mutex_unlock(&rdev->mutex); 490 return sprintf(buf, "%d\n", uA); 491} 492static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 493 494static ssize_t regulator_num_users_show(struct device *dev, 495 struct device_attribute *attr, char *buf) 496{ 497 struct regulator_dev *rdev = dev_get_drvdata(dev); 498 return sprintf(buf, "%d\n", rdev->use_count); 499} 500 501static ssize_t regulator_type_show(struct device *dev, 502 struct device_attribute *attr, char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514 515static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 516 struct device_attribute *attr, char *buf) 517{ 518 struct regulator_dev *rdev = dev_get_drvdata(dev); 519 520 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 521} 522static DEVICE_ATTR(suspend_mem_microvolts, 0444, 523 regulator_suspend_mem_uV_show, NULL); 524 525static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 526 struct device_attribute *attr, char *buf) 527{ 528 struct regulator_dev *rdev = dev_get_drvdata(dev); 529 530 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 531} 532static DEVICE_ATTR(suspend_disk_microvolts, 0444, 533 regulator_suspend_disk_uV_show, NULL); 534 535static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 536 struct device_attribute *attr, char *buf) 537{ 538 struct regulator_dev *rdev = dev_get_drvdata(dev); 539 540 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 541} 542static DEVICE_ATTR(suspend_standby_microvolts, 0444, 543 regulator_suspend_standby_uV_show, NULL); 544 545static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 546 struct device_attribute *attr, char *buf) 547{ 548 struct regulator_dev *rdev = dev_get_drvdata(dev); 549 550 return regulator_print_opmode(buf, 551 rdev->constraints->state_mem.mode); 552} 553static DEVICE_ATTR(suspend_mem_mode, 0444, 554 regulator_suspend_mem_mode_show, NULL); 555 556static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 557 struct device_attribute *attr, char *buf) 558{ 559 struct regulator_dev *rdev = dev_get_drvdata(dev); 560 561 return regulator_print_opmode(buf, 562 rdev->constraints->state_disk.mode); 563} 564static DEVICE_ATTR(suspend_disk_mode, 0444, 565 regulator_suspend_disk_mode_show, NULL); 566 567static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 568 struct device_attribute *attr, char *buf) 569{ 570 struct regulator_dev *rdev = dev_get_drvdata(dev); 571 572 return regulator_print_opmode(buf, 573 rdev->constraints->state_standby.mode); 574} 575static DEVICE_ATTR(suspend_standby_mode, 0444, 576 regulator_suspend_standby_mode_show, NULL); 577 578static ssize_t regulator_suspend_mem_state_show(struct device *dev, 579 struct device_attribute *attr, char *buf) 580{ 581 struct regulator_dev *rdev = dev_get_drvdata(dev); 582 583 return regulator_print_state(buf, 584 rdev->constraints->state_mem.enabled); 585} 586static DEVICE_ATTR(suspend_mem_state, 0444, 587 regulator_suspend_mem_state_show, NULL); 588 589static ssize_t regulator_suspend_disk_state_show(struct device *dev, 590 struct device_attribute *attr, char *buf) 591{ 592 struct regulator_dev *rdev = dev_get_drvdata(dev); 593 594 return regulator_print_state(buf, 595 rdev->constraints->state_disk.enabled); 596} 597static DEVICE_ATTR(suspend_disk_state, 0444, 598 regulator_suspend_disk_state_show, NULL); 599 600static ssize_t regulator_suspend_standby_state_show(struct device *dev, 601 struct device_attribute *attr, char *buf) 602{ 603 struct regulator_dev *rdev = dev_get_drvdata(dev); 604 605 return regulator_print_state(buf, 606 rdev->constraints->state_standby.enabled); 607} 608static DEVICE_ATTR(suspend_standby_state, 0444, 609 regulator_suspend_standby_state_show, NULL); 610 611 612/* 613 * These are the only attributes are present for all regulators. 614 * Other attributes are a function of regulator functionality. 615 */ 616static struct device_attribute regulator_dev_attrs[] = { 617 __ATTR(name, 0444, regulator_name_show, NULL), 618 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 619 __ATTR(type, 0444, regulator_type_show, NULL), 620 __ATTR_NULL, 621}; 622 623static void regulator_dev_release(struct device *dev) 624{ 625 struct regulator_dev *rdev = dev_get_drvdata(dev); 626 kfree(rdev); 627} 628 629static struct class regulator_class = { 630 .name = "regulator", 631 .dev_release = regulator_dev_release, 632 .dev_attrs = regulator_dev_attrs, 633}; 634 635/* Calculate the new optimum regulator operating mode based on the new total 636 * consumer load. All locks held by caller */ 637static void drms_uA_update(struct regulator_dev *rdev) 638{ 639 struct regulator *sibling; 640 int current_uA = 0, output_uV, input_uV, err; 641 unsigned int mode; 642 643 err = regulator_check_drms(rdev); 644 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 645 (!rdev->desc->ops->get_voltage && 646 !rdev->desc->ops->get_voltage_sel) || 647 !rdev->desc->ops->set_mode) 648 return; 649 650 /* get output voltage */ 651 output_uV = _regulator_get_voltage(rdev); 652 if (output_uV <= 0) 653 return; 654 655 /* get input voltage */ 656 input_uV = 0; 657 if (rdev->supply) 658 input_uV = _regulator_get_voltage(rdev); 659 if (input_uV <= 0) 660 input_uV = rdev->constraints->input_uV; 661 if (input_uV <= 0) 662 return; 663 664 /* calc total requested load */ 665 list_for_each_entry(sibling, &rdev->consumer_list, list) 666 current_uA += sibling->uA_load; 667 668 /* now get the optimum mode for our new total regulator load */ 669 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 670 output_uV, current_uA); 671 672 /* check the new mode is allowed */ 673 err = regulator_mode_constrain(rdev, &mode); 674 if (err == 0) 675 rdev->desc->ops->set_mode(rdev, mode); 676} 677 678static int suspend_set_state(struct regulator_dev *rdev, 679 struct regulator_state *rstate) 680{ 681 int ret = 0; 682 bool can_set_state; 683 684 can_set_state = rdev->desc->ops->set_suspend_enable && 685 rdev->desc->ops->set_suspend_disable; 686 687 /* If we have no suspend mode configration don't set anything; 688 * only warn if the driver actually makes the suspend mode 689 * configurable. 690 */ 691 if (!rstate->enabled && !rstate->disabled) { 692 if (can_set_state) 693 rdev_warn(rdev, "No configuration\n"); 694 return 0; 695 } 696 697 if (rstate->enabled && rstate->disabled) { 698 rdev_err(rdev, "invalid configuration\n"); 699 return -EINVAL; 700 } 701 702 if (!can_set_state) { 703 rdev_err(rdev, "no way to set suspend state\n"); 704 return -EINVAL; 705 } 706 707 if (rstate->enabled) 708 ret = rdev->desc->ops->set_suspend_enable(rdev); 709 else 710 ret = rdev->desc->ops->set_suspend_disable(rdev); 711 if (ret < 0) { 712 rdev_err(rdev, "failed to enabled/disable\n"); 713 return ret; 714 } 715 716 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 717 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 718 if (ret < 0) { 719 rdev_err(rdev, "failed to set voltage\n"); 720 return ret; 721 } 722 } 723 724 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 725 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 726 if (ret < 0) { 727 rdev_err(rdev, "failed to set mode\n"); 728 return ret; 729 } 730 } 731 return ret; 732} 733 734/* locks held by caller */ 735static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 736{ 737 if (!rdev->constraints) 738 return -EINVAL; 739 740 switch (state) { 741 case PM_SUSPEND_STANDBY: 742 return suspend_set_state(rdev, 743 &rdev->constraints->state_standby); 744 case PM_SUSPEND_MEM: 745 return suspend_set_state(rdev, 746 &rdev->constraints->state_mem); 747 case PM_SUSPEND_MAX: 748 return suspend_set_state(rdev, 749 &rdev->constraints->state_disk); 750 default: 751 return -EINVAL; 752 } 753} 754 755static void print_constraints(struct regulator_dev *rdev) 756{ 757 struct regulation_constraints *constraints = rdev->constraints; 758 char buf[80] = ""; 759 int count = 0; 760 int ret; 761 762 if (constraints->min_uV && constraints->max_uV) { 763 if (constraints->min_uV == constraints->max_uV) 764 count += sprintf(buf + count, "%d mV ", 765 constraints->min_uV / 1000); 766 else 767 count += sprintf(buf + count, "%d <--> %d mV ", 768 constraints->min_uV / 1000, 769 constraints->max_uV / 1000); 770 } 771 772 if (!constraints->min_uV || 773 constraints->min_uV != constraints->max_uV) { 774 ret = _regulator_get_voltage(rdev); 775 if (ret > 0) 776 count += sprintf(buf + count, "at %d mV ", ret / 1000); 777 } 778 779 if (constraints->uV_offset) 780 count += sprintf(buf, "%dmV offset ", 781 constraints->uV_offset / 1000); 782 783 if (constraints->min_uA && constraints->max_uA) { 784 if (constraints->min_uA == constraints->max_uA) 785 count += sprintf(buf + count, "%d mA ", 786 constraints->min_uA / 1000); 787 else 788 count += sprintf(buf + count, "%d <--> %d mA ", 789 constraints->min_uA / 1000, 790 constraints->max_uA / 1000); 791 } 792 793 if (!constraints->min_uA || 794 constraints->min_uA != constraints->max_uA) { 795 ret = _regulator_get_current_limit(rdev); 796 if (ret > 0) 797 count += sprintf(buf + count, "at %d mA ", ret / 1000); 798 } 799 800 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 801 count += sprintf(buf + count, "fast "); 802 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 803 count += sprintf(buf + count, "normal "); 804 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 805 count += sprintf(buf + count, "idle "); 806 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 807 count += sprintf(buf + count, "standby"); 808 809 rdev_info(rdev, "%s\n", buf); 810} 811 812static int machine_constraints_voltage(struct regulator_dev *rdev, 813 struct regulation_constraints *constraints) 814{ 815 struct regulator_ops *ops = rdev->desc->ops; 816 int ret; 817 818 /* do we need to apply the constraint voltage */ 819 if (rdev->constraints->apply_uV && 820 rdev->constraints->min_uV == rdev->constraints->max_uV) { 821 ret = _regulator_do_set_voltage(rdev, 822 rdev->constraints->min_uV, 823 rdev->constraints->max_uV); 824 if (ret < 0) { 825 rdev_err(rdev, "failed to apply %duV constraint\n", 826 rdev->constraints->min_uV); 827 return ret; 828 } 829 } 830 831 /* constrain machine-level voltage specs to fit 832 * the actual range supported by this regulator. 833 */ 834 if (ops->list_voltage && rdev->desc->n_voltages) { 835 int count = rdev->desc->n_voltages; 836 int i; 837 int min_uV = INT_MAX; 838 int max_uV = INT_MIN; 839 int cmin = constraints->min_uV; 840 int cmax = constraints->max_uV; 841 842 /* it's safe to autoconfigure fixed-voltage supplies 843 and the constraints are used by list_voltage. */ 844 if (count == 1 && !cmin) { 845 cmin = 1; 846 cmax = INT_MAX; 847 constraints->min_uV = cmin; 848 constraints->max_uV = cmax; 849 } 850 851 /* voltage constraints are optional */ 852 if ((cmin == 0) && (cmax == 0)) 853 return 0; 854 855 /* else require explicit machine-level constraints */ 856 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 857 rdev_err(rdev, "invalid voltage constraints\n"); 858 return -EINVAL; 859 } 860 861 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 862 for (i = 0; i < count; i++) { 863 int value; 864 865 value = ops->list_voltage(rdev, i); 866 if (value <= 0) 867 continue; 868 869 /* maybe adjust [min_uV..max_uV] */ 870 if (value >= cmin && value < min_uV) 871 min_uV = value; 872 if (value <= cmax && value > max_uV) 873 max_uV = value; 874 } 875 876 /* final: [min_uV..max_uV] valid iff constraints valid */ 877 if (max_uV < min_uV) { 878 rdev_err(rdev, "unsupportable voltage constraints\n"); 879 return -EINVAL; 880 } 881 882 /* use regulator's subset of machine constraints */ 883 if (constraints->min_uV < min_uV) { 884 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 885 constraints->min_uV, min_uV); 886 constraints->min_uV = min_uV; 887 } 888 if (constraints->max_uV > max_uV) { 889 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 890 constraints->max_uV, max_uV); 891 constraints->max_uV = max_uV; 892 } 893 } 894 895 return 0; 896} 897 898/** 899 * set_machine_constraints - sets regulator constraints 900 * @rdev: regulator source 901 * @constraints: constraints to apply 902 * 903 * Allows platform initialisation code to define and constrain 904 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 905 * Constraints *must* be set by platform code in order for some 906 * regulator operations to proceed i.e. set_voltage, set_current_limit, 907 * set_mode. 908 */ 909static int set_machine_constraints(struct regulator_dev *rdev, 910 const struct regulation_constraints *constraints) 911{ 912 int ret = 0; 913 struct regulator_ops *ops = rdev->desc->ops; 914 915 if (constraints) 916 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 917 GFP_KERNEL); 918 else 919 rdev->constraints = kzalloc(sizeof(*constraints), 920 GFP_KERNEL); 921 if (!rdev->constraints) 922 return -ENOMEM; 923 924 ret = machine_constraints_voltage(rdev, rdev->constraints); 925 if (ret != 0) 926 goto out; 927 928 /* do we need to setup our suspend state */ 929 if (rdev->constraints->initial_state) { 930 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 931 if (ret < 0) { 932 rdev_err(rdev, "failed to set suspend state\n"); 933 goto out; 934 } 935 } 936 937 if (rdev->constraints->initial_mode) { 938 if (!ops->set_mode) { 939 rdev_err(rdev, "no set_mode operation\n"); 940 ret = -EINVAL; 941 goto out; 942 } 943 944 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 945 if (ret < 0) { 946 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 947 goto out; 948 } 949 } 950 951 /* If the constraints say the regulator should be on at this point 952 * and we have control then make sure it is enabled. 953 */ 954 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 955 ops->enable) { 956 ret = ops->enable(rdev); 957 if (ret < 0) { 958 rdev_err(rdev, "failed to enable\n"); 959 goto out; 960 } 961 } 962 963 print_constraints(rdev); 964 return 0; 965out: 966 kfree(rdev->constraints); 967 rdev->constraints = NULL; 968 return ret; 969} 970 971/** 972 * set_supply - set regulator supply regulator 973 * @rdev: regulator name 974 * @supply_rdev: supply regulator name 975 * 976 * Called by platform initialisation code to set the supply regulator for this 977 * regulator. This ensures that a regulators supply will also be enabled by the 978 * core if it's child is enabled. 979 */ 980static int set_supply(struct regulator_dev *rdev, 981 struct regulator_dev *supply_rdev) 982{ 983 int err; 984 985 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 986 987 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 988 if (IS_ERR(rdev->supply)) { 989 err = PTR_ERR(rdev->supply); 990 rdev->supply = NULL; 991 return err; 992 } 993 994 return 0; 995} 996 997/** 998 * set_consumer_device_supply - Bind a regulator to a symbolic supply 999 * @rdev: regulator source 1000 * @consumer_dev: device the supply applies to 1001 * @consumer_dev_name: dev_name() string for device supply applies to 1002 * @supply: symbolic name for supply 1003 * 1004 * Allows platform initialisation code to map physical regulator 1005 * sources to symbolic names for supplies for use by devices. Devices 1006 * should use these symbolic names to request regulators, avoiding the 1007 * need to provide board-specific regulator names as platform data. 1008 * 1009 * Only one of consumer_dev and consumer_dev_name may be specified. 1010 */ 1011static int set_consumer_device_supply(struct regulator_dev *rdev, 1012 struct device *consumer_dev, const char *consumer_dev_name, 1013 const char *supply) 1014{ 1015 struct regulator_map *node; 1016 int has_dev; 1017 1018 if (consumer_dev && consumer_dev_name) 1019 return -EINVAL; 1020 1021 if (!consumer_dev_name && consumer_dev) 1022 consumer_dev_name = dev_name(consumer_dev); 1023 1024 if (supply == NULL) 1025 return -EINVAL; 1026 1027 if (consumer_dev_name != NULL) 1028 has_dev = 1; 1029 else 1030 has_dev = 0; 1031 1032 list_for_each_entry(node, ®ulator_map_list, list) { 1033 if (node->dev_name && consumer_dev_name) { 1034 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1035 continue; 1036 } else if (node->dev_name || consumer_dev_name) { 1037 continue; 1038 } 1039 1040 if (strcmp(node->supply, supply) != 0) 1041 continue; 1042 1043 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 1044 dev_name(&node->regulator->dev), 1045 node->regulator->desc->name, 1046 supply, 1047 dev_name(&rdev->dev), rdev_get_name(rdev)); 1048 return -EBUSY; 1049 } 1050 1051 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1052 if (node == NULL) 1053 return -ENOMEM; 1054 1055 node->regulator = rdev; 1056 node->supply = supply; 1057 1058 if (has_dev) { 1059 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1060 if (node->dev_name == NULL) { 1061 kfree(node); 1062 return -ENOMEM; 1063 } 1064 } 1065 1066 list_add(&node->list, ®ulator_map_list); 1067 return 0; 1068} 1069 1070static void unset_regulator_supplies(struct regulator_dev *rdev) 1071{ 1072 struct regulator_map *node, *n; 1073 1074 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1075 if (rdev == node->regulator) { 1076 list_del(&node->list); 1077 kfree(node->dev_name); 1078 kfree(node); 1079 } 1080 } 1081} 1082 1083#define REG_STR_SIZE 64 1084 1085static struct regulator *create_regulator(struct regulator_dev *rdev, 1086 struct device *dev, 1087 const char *supply_name) 1088{ 1089 struct regulator *regulator; 1090 char buf[REG_STR_SIZE]; 1091 int err, size; 1092 1093 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1094 if (regulator == NULL) 1095 return NULL; 1096 1097 mutex_lock(&rdev->mutex); 1098 regulator->rdev = rdev; 1099 list_add(®ulator->list, &rdev->consumer_list); 1100 1101 if (dev) { 1102 /* create a 'requested_microamps_name' sysfs entry */ 1103 size = scnprintf(buf, REG_STR_SIZE, 1104 "microamps_requested_%s-%s", 1105 dev_name(dev), supply_name); 1106 if (size >= REG_STR_SIZE) 1107 goto overflow_err; 1108 1109 regulator->dev = dev; 1110 sysfs_attr_init(®ulator->dev_attr.attr); 1111 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1112 if (regulator->dev_attr.attr.name == NULL) 1113 goto attr_name_err; 1114 1115 regulator->dev_attr.attr.mode = 0444; 1116 regulator->dev_attr.show = device_requested_uA_show; 1117 err = device_create_file(dev, ®ulator->dev_attr); 1118 if (err < 0) { 1119 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1120 goto attr_name_err; 1121 } 1122 1123 /* also add a link to the device sysfs entry */ 1124 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1125 dev->kobj.name, supply_name); 1126 if (size >= REG_STR_SIZE) 1127 goto attr_err; 1128 1129 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1130 if (regulator->supply_name == NULL) 1131 goto attr_err; 1132 1133 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1134 buf); 1135 if (err) { 1136 rdev_warn(rdev, "could not add device link %s err %d\n", 1137 dev->kobj.name, err); 1138 goto link_name_err; 1139 } 1140 } else { 1141 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1142 if (regulator->supply_name == NULL) 1143 goto attr_err; 1144 } 1145 1146#ifdef CONFIG_DEBUG_FS 1147 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1148 rdev->debugfs); 1149 if (IS_ERR_OR_NULL(regulator->debugfs)) { 1150 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1151 regulator->debugfs = NULL; 1152 } else { 1153 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1154 ®ulator->uA_load); 1155 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1156 ®ulator->min_uV); 1157 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1158 ®ulator->max_uV); 1159 } 1160#endif 1161 1162 mutex_unlock(&rdev->mutex); 1163 return regulator; 1164link_name_err: 1165 kfree(regulator->supply_name); 1166attr_err: 1167 device_remove_file(regulator->dev, ®ulator->dev_attr); 1168attr_name_err: 1169 kfree(regulator->dev_attr.attr.name); 1170overflow_err: 1171 list_del(®ulator->list); 1172 kfree(regulator); 1173 mutex_unlock(&rdev->mutex); 1174 return NULL; 1175} 1176 1177static int _regulator_get_enable_time(struct regulator_dev *rdev) 1178{ 1179 if (!rdev->desc->ops->enable_time) 1180 return 0; 1181 return rdev->desc->ops->enable_time(rdev); 1182} 1183 1184static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1185 const char *supply) 1186{ 1187 struct regulator_dev *r; 1188 struct device_node *node; 1189 1190 /* first do a dt based lookup */ 1191 if (dev && dev->of_node) { 1192 node = of_get_regulator(dev, supply); 1193 if (node) 1194 list_for_each_entry(r, ®ulator_list, list) 1195 if (r->dev.parent && 1196 node == r->dev.of_node) 1197 return r; 1198 } 1199 1200 /* if not found, try doing it non-dt way */ 1201 list_for_each_entry(r, ®ulator_list, list) 1202 if (strcmp(rdev_get_name(r), supply) == 0) 1203 return r; 1204 1205 return NULL; 1206} 1207 1208/* Internal regulator request function */ 1209static struct regulator *_regulator_get(struct device *dev, const char *id, 1210 int exclusive) 1211{ 1212 struct regulator_dev *rdev; 1213 struct regulator_map *map; 1214 struct regulator *regulator = ERR_PTR(-ENODEV); 1215 const char *devname = NULL; 1216 int ret; 1217 1218 if (id == NULL) { 1219 pr_err("get() with no identifier\n"); 1220 return regulator; 1221 } 1222 1223 if (dev) 1224 devname = dev_name(dev); 1225 1226 mutex_lock(®ulator_list_mutex); 1227 1228 rdev = regulator_dev_lookup(dev, id); 1229 if (rdev) 1230 goto found; 1231 1232 list_for_each_entry(map, ®ulator_map_list, list) { 1233 /* If the mapping has a device set up it must match */ 1234 if (map->dev_name && 1235 (!devname || strcmp(map->dev_name, devname))) 1236 continue; 1237 1238 if (strcmp(map->supply, id) == 0) { 1239 rdev = map->regulator; 1240 goto found; 1241 } 1242 } 1243 1244 if (board_wants_dummy_regulator) { 1245 rdev = dummy_regulator_rdev; 1246 goto found; 1247 } 1248 1249#ifdef CONFIG_REGULATOR_DUMMY 1250 if (!devname) 1251 devname = "deviceless"; 1252 1253 /* If the board didn't flag that it was fully constrained then 1254 * substitute in a dummy regulator so consumers can continue. 1255 */ 1256 if (!has_full_constraints) { 1257 pr_warn("%s supply %s not found, using dummy regulator\n", 1258 devname, id); 1259 rdev = dummy_regulator_rdev; 1260 goto found; 1261 } 1262#endif 1263 1264 mutex_unlock(®ulator_list_mutex); 1265 return regulator; 1266 1267found: 1268 if (rdev->exclusive) { 1269 regulator = ERR_PTR(-EPERM); 1270 goto out; 1271 } 1272 1273 if (exclusive && rdev->open_count) { 1274 regulator = ERR_PTR(-EBUSY); 1275 goto out; 1276 } 1277 1278 if (!try_module_get(rdev->owner)) 1279 goto out; 1280 1281 regulator = create_regulator(rdev, dev, id); 1282 if (regulator == NULL) { 1283 regulator = ERR_PTR(-ENOMEM); 1284 module_put(rdev->owner); 1285 } 1286 1287 rdev->open_count++; 1288 if (exclusive) { 1289 rdev->exclusive = 1; 1290 1291 ret = _regulator_is_enabled(rdev); 1292 if (ret > 0) 1293 rdev->use_count = 1; 1294 else 1295 rdev->use_count = 0; 1296 } 1297 1298out: 1299 mutex_unlock(®ulator_list_mutex); 1300 1301 return regulator; 1302} 1303 1304/** 1305 * regulator_get - lookup and obtain a reference to a regulator. 1306 * @dev: device for regulator "consumer" 1307 * @id: Supply name or regulator ID. 1308 * 1309 * Returns a struct regulator corresponding to the regulator producer, 1310 * or IS_ERR() condition containing errno. 1311 * 1312 * Use of supply names configured via regulator_set_device_supply() is 1313 * strongly encouraged. It is recommended that the supply name used 1314 * should match the name used for the supply and/or the relevant 1315 * device pins in the datasheet. 1316 */ 1317struct regulator *regulator_get(struct device *dev, const char *id) 1318{ 1319 return _regulator_get(dev, id, 0); 1320} 1321EXPORT_SYMBOL_GPL(regulator_get); 1322 1323/** 1324 * regulator_get_exclusive - obtain exclusive access to a regulator. 1325 * @dev: device for regulator "consumer" 1326 * @id: Supply name or regulator ID. 1327 * 1328 * Returns a struct regulator corresponding to the regulator producer, 1329 * or IS_ERR() condition containing errno. Other consumers will be 1330 * unable to obtain this reference is held and the use count for the 1331 * regulator will be initialised to reflect the current state of the 1332 * regulator. 1333 * 1334 * This is intended for use by consumers which cannot tolerate shared 1335 * use of the regulator such as those which need to force the 1336 * regulator off for correct operation of the hardware they are 1337 * controlling. 1338 * 1339 * Use of supply names configured via regulator_set_device_supply() is 1340 * strongly encouraged. It is recommended that the supply name used 1341 * should match the name used for the supply and/or the relevant 1342 * device pins in the datasheet. 1343 */ 1344struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1345{ 1346 return _regulator_get(dev, id, 1); 1347} 1348EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1349 1350/** 1351 * regulator_put - "free" the regulator source 1352 * @regulator: regulator source 1353 * 1354 * Note: drivers must ensure that all regulator_enable calls made on this 1355 * regulator source are balanced by regulator_disable calls prior to calling 1356 * this function. 1357 */ 1358void regulator_put(struct regulator *regulator) 1359{ 1360 struct regulator_dev *rdev; 1361 1362 if (regulator == NULL || IS_ERR(regulator)) 1363 return; 1364 1365 mutex_lock(®ulator_list_mutex); 1366 rdev = regulator->rdev; 1367 1368#ifdef CONFIG_DEBUG_FS 1369 debugfs_remove_recursive(regulator->debugfs); 1370#endif 1371 1372 /* remove any sysfs entries */ 1373 if (regulator->dev) { 1374 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1375 device_remove_file(regulator->dev, ®ulator->dev_attr); 1376 kfree(regulator->dev_attr.attr.name); 1377 } 1378 kfree(regulator->supply_name); 1379 list_del(®ulator->list); 1380 kfree(regulator); 1381 1382 rdev->open_count--; 1383 rdev->exclusive = 0; 1384 1385 module_put(rdev->owner); 1386 mutex_unlock(®ulator_list_mutex); 1387} 1388EXPORT_SYMBOL_GPL(regulator_put); 1389 1390static int _regulator_can_change_status(struct regulator_dev *rdev) 1391{ 1392 if (!rdev->constraints) 1393 return 0; 1394 1395 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1396 return 1; 1397 else 1398 return 0; 1399} 1400 1401/* locks held by regulator_enable() */ 1402static int _regulator_enable(struct regulator_dev *rdev) 1403{ 1404 int ret, delay; 1405 1406 /* check voltage and requested load before enabling */ 1407 if (rdev->constraints && 1408 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1409 drms_uA_update(rdev); 1410 1411 if (rdev->use_count == 0) { 1412 /* The regulator may on if it's not switchable or left on */ 1413 ret = _regulator_is_enabled(rdev); 1414 if (ret == -EINVAL || ret == 0) { 1415 if (!_regulator_can_change_status(rdev)) 1416 return -EPERM; 1417 1418 if (!rdev->desc->ops->enable) 1419 return -EINVAL; 1420 1421 /* Query before enabling in case configuration 1422 * dependent. */ 1423 ret = _regulator_get_enable_time(rdev); 1424 if (ret >= 0) { 1425 delay = ret; 1426 } else { 1427 rdev_warn(rdev, "enable_time() failed: %d\n", 1428 ret); 1429 delay = 0; 1430 } 1431 1432 trace_regulator_enable(rdev_get_name(rdev)); 1433 1434 /* Allow the regulator to ramp; it would be useful 1435 * to extend this for bulk operations so that the 1436 * regulators can ramp together. */ 1437 ret = rdev->desc->ops->enable(rdev); 1438 if (ret < 0) 1439 return ret; 1440 1441 trace_regulator_enable_delay(rdev_get_name(rdev)); 1442 1443 if (delay >= 1000) { 1444 mdelay(delay / 1000); 1445 udelay(delay % 1000); 1446 } else if (delay) { 1447 udelay(delay); 1448 } 1449 1450 trace_regulator_enable_complete(rdev_get_name(rdev)); 1451 1452 } else if (ret < 0) { 1453 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1454 return ret; 1455 } 1456 /* Fallthrough on positive return values - already enabled */ 1457 } 1458 1459 rdev->use_count++; 1460 1461 return 0; 1462} 1463 1464/** 1465 * regulator_enable - enable regulator output 1466 * @regulator: regulator source 1467 * 1468 * Request that the regulator be enabled with the regulator output at 1469 * the predefined voltage or current value. Calls to regulator_enable() 1470 * must be balanced with calls to regulator_disable(). 1471 * 1472 * NOTE: the output value can be set by other drivers, boot loader or may be 1473 * hardwired in the regulator. 1474 */ 1475int regulator_enable(struct regulator *regulator) 1476{ 1477 struct regulator_dev *rdev = regulator->rdev; 1478 int ret = 0; 1479 1480 if (rdev->supply) { 1481 ret = regulator_enable(rdev->supply); 1482 if (ret != 0) 1483 return ret; 1484 } 1485 1486 mutex_lock(&rdev->mutex); 1487 ret = _regulator_enable(rdev); 1488 mutex_unlock(&rdev->mutex); 1489 1490 if (ret != 0 && rdev->supply) 1491 regulator_disable(rdev->supply); 1492 1493 return ret; 1494} 1495EXPORT_SYMBOL_GPL(regulator_enable); 1496 1497/* locks held by regulator_disable() */ 1498static int _regulator_disable(struct regulator_dev *rdev) 1499{ 1500 int ret = 0; 1501 1502 if (WARN(rdev->use_count <= 0, 1503 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1504 return -EIO; 1505 1506 /* are we the last user and permitted to disable ? */ 1507 if (rdev->use_count == 1 && 1508 (rdev->constraints && !rdev->constraints->always_on)) { 1509 1510 /* we are last user */ 1511 if (_regulator_can_change_status(rdev) && 1512 rdev->desc->ops->disable) { 1513 trace_regulator_disable(rdev_get_name(rdev)); 1514 1515 ret = rdev->desc->ops->disable(rdev); 1516 if (ret < 0) { 1517 rdev_err(rdev, "failed to disable\n"); 1518 return ret; 1519 } 1520 1521 trace_regulator_disable_complete(rdev_get_name(rdev)); 1522 1523 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1524 NULL); 1525 } 1526 1527 rdev->use_count = 0; 1528 } else if (rdev->use_count > 1) { 1529 1530 if (rdev->constraints && 1531 (rdev->constraints->valid_ops_mask & 1532 REGULATOR_CHANGE_DRMS)) 1533 drms_uA_update(rdev); 1534 1535 rdev->use_count--; 1536 } 1537 1538 return ret; 1539} 1540 1541/** 1542 * regulator_disable - disable regulator output 1543 * @regulator: regulator source 1544 * 1545 * Disable the regulator output voltage or current. Calls to 1546 * regulator_enable() must be balanced with calls to 1547 * regulator_disable(). 1548 * 1549 * NOTE: this will only disable the regulator output if no other consumer 1550 * devices have it enabled, the regulator device supports disabling and 1551 * machine constraints permit this operation. 1552 */ 1553int regulator_disable(struct regulator *regulator) 1554{ 1555 struct regulator_dev *rdev = regulator->rdev; 1556 int ret = 0; 1557 1558 mutex_lock(&rdev->mutex); 1559 ret = _regulator_disable(rdev); 1560 mutex_unlock(&rdev->mutex); 1561 1562 if (ret == 0 && rdev->supply) 1563 regulator_disable(rdev->supply); 1564 1565 return ret; 1566} 1567EXPORT_SYMBOL_GPL(regulator_disable); 1568 1569/* locks held by regulator_force_disable() */ 1570static int _regulator_force_disable(struct regulator_dev *rdev) 1571{ 1572 int ret = 0; 1573 1574 /* force disable */ 1575 if (rdev->desc->ops->disable) { 1576 /* ah well, who wants to live forever... */ 1577 ret = rdev->desc->ops->disable(rdev); 1578 if (ret < 0) { 1579 rdev_err(rdev, "failed to force disable\n"); 1580 return ret; 1581 } 1582 /* notify other consumers that power has been forced off */ 1583 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1584 REGULATOR_EVENT_DISABLE, NULL); 1585 } 1586 1587 return ret; 1588} 1589 1590/** 1591 * regulator_force_disable - force disable regulator output 1592 * @regulator: regulator source 1593 * 1594 * Forcibly disable the regulator output voltage or current. 1595 * NOTE: this *will* disable the regulator output even if other consumer 1596 * devices have it enabled. This should be used for situations when device 1597 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1598 */ 1599int regulator_force_disable(struct regulator *regulator) 1600{ 1601 struct regulator_dev *rdev = regulator->rdev; 1602 int ret; 1603 1604 mutex_lock(&rdev->mutex); 1605 regulator->uA_load = 0; 1606 ret = _regulator_force_disable(regulator->rdev); 1607 mutex_unlock(&rdev->mutex); 1608 1609 if (rdev->supply) 1610 while (rdev->open_count--) 1611 regulator_disable(rdev->supply); 1612 1613 return ret; 1614} 1615EXPORT_SYMBOL_GPL(regulator_force_disable); 1616 1617static void regulator_disable_work(struct work_struct *work) 1618{ 1619 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1620 disable_work.work); 1621 int count, i, ret; 1622 1623 mutex_lock(&rdev->mutex); 1624 1625 BUG_ON(!rdev->deferred_disables); 1626 1627 count = rdev->deferred_disables; 1628 rdev->deferred_disables = 0; 1629 1630 for (i = 0; i < count; i++) { 1631 ret = _regulator_disable(rdev); 1632 if (ret != 0) 1633 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1634 } 1635 1636 mutex_unlock(&rdev->mutex); 1637 1638 if (rdev->supply) { 1639 for (i = 0; i < count; i++) { 1640 ret = regulator_disable(rdev->supply); 1641 if (ret != 0) { 1642 rdev_err(rdev, 1643 "Supply disable failed: %d\n", ret); 1644 } 1645 } 1646 } 1647} 1648 1649/** 1650 * regulator_disable_deferred - disable regulator output with delay 1651 * @regulator: regulator source 1652 * @ms: miliseconds until the regulator is disabled 1653 * 1654 * Execute regulator_disable() on the regulator after a delay. This 1655 * is intended for use with devices that require some time to quiesce. 1656 * 1657 * NOTE: this will only disable the regulator output if no other consumer 1658 * devices have it enabled, the regulator device supports disabling and 1659 * machine constraints permit this operation. 1660 */ 1661int regulator_disable_deferred(struct regulator *regulator, int ms) 1662{ 1663 struct regulator_dev *rdev = regulator->rdev; 1664 int ret; 1665 1666 mutex_lock(&rdev->mutex); 1667 rdev->deferred_disables++; 1668 mutex_unlock(&rdev->mutex); 1669 1670 ret = schedule_delayed_work(&rdev->disable_work, 1671 msecs_to_jiffies(ms)); 1672 if (ret < 0) 1673 return ret; 1674 else 1675 return 0; 1676} 1677EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1678 1679static int _regulator_is_enabled(struct regulator_dev *rdev) 1680{ 1681 /* If we don't know then assume that the regulator is always on */ 1682 if (!rdev->desc->ops->is_enabled) 1683 return 1; 1684 1685 return rdev->desc->ops->is_enabled(rdev); 1686} 1687 1688/** 1689 * regulator_is_enabled - is the regulator output enabled 1690 * @regulator: regulator source 1691 * 1692 * Returns positive if the regulator driver backing the source/client 1693 * has requested that the device be enabled, zero if it hasn't, else a 1694 * negative errno code. 1695 * 1696 * Note that the device backing this regulator handle can have multiple 1697 * users, so it might be enabled even if regulator_enable() was never 1698 * called for this particular source. 1699 */ 1700int regulator_is_enabled(struct regulator *regulator) 1701{ 1702 int ret; 1703 1704 mutex_lock(®ulator->rdev->mutex); 1705 ret = _regulator_is_enabled(regulator->rdev); 1706 mutex_unlock(®ulator->rdev->mutex); 1707 1708 return ret; 1709} 1710EXPORT_SYMBOL_GPL(regulator_is_enabled); 1711 1712/** 1713 * regulator_count_voltages - count regulator_list_voltage() selectors 1714 * @regulator: regulator source 1715 * 1716 * Returns number of selectors, or negative errno. Selectors are 1717 * numbered starting at zero, and typically correspond to bitfields 1718 * in hardware registers. 1719 */ 1720int regulator_count_voltages(struct regulator *regulator) 1721{ 1722 struct regulator_dev *rdev = regulator->rdev; 1723 1724 return rdev->desc->n_voltages ? : -EINVAL; 1725} 1726EXPORT_SYMBOL_GPL(regulator_count_voltages); 1727 1728/** 1729 * regulator_list_voltage - enumerate supported voltages 1730 * @regulator: regulator source 1731 * @selector: identify voltage to list 1732 * Context: can sleep 1733 * 1734 * Returns a voltage that can be passed to @regulator_set_voltage(), 1735 * zero if this selector code can't be used on this system, or a 1736 * negative errno. 1737 */ 1738int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1739{ 1740 struct regulator_dev *rdev = regulator->rdev; 1741 struct regulator_ops *ops = rdev->desc->ops; 1742 int ret; 1743 1744 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1745 return -EINVAL; 1746 1747 mutex_lock(&rdev->mutex); 1748 ret = ops->list_voltage(rdev, selector); 1749 mutex_unlock(&rdev->mutex); 1750 1751 if (ret > 0) { 1752 if (ret < rdev->constraints->min_uV) 1753 ret = 0; 1754 else if (ret > rdev->constraints->max_uV) 1755 ret = 0; 1756 } 1757 1758 return ret; 1759} 1760EXPORT_SYMBOL_GPL(regulator_list_voltage); 1761 1762/** 1763 * regulator_is_supported_voltage - check if a voltage range can be supported 1764 * 1765 * @regulator: Regulator to check. 1766 * @min_uV: Minimum required voltage in uV. 1767 * @max_uV: Maximum required voltage in uV. 1768 * 1769 * Returns a boolean or a negative error code. 1770 */ 1771int regulator_is_supported_voltage(struct regulator *regulator, 1772 int min_uV, int max_uV) 1773{ 1774 int i, voltages, ret; 1775 1776 ret = regulator_count_voltages(regulator); 1777 if (ret < 0) 1778 return ret; 1779 voltages = ret; 1780 1781 for (i = 0; i < voltages; i++) { 1782 ret = regulator_list_voltage(regulator, i); 1783 1784 if (ret >= min_uV && ret <= max_uV) 1785 return 1; 1786 } 1787 1788 return 0; 1789} 1790 1791static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1792 int min_uV, int max_uV) 1793{ 1794 int ret; 1795 int delay = 0; 1796 unsigned int selector; 1797 1798 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1799 1800 min_uV += rdev->constraints->uV_offset; 1801 max_uV += rdev->constraints->uV_offset; 1802 1803 if (rdev->desc->ops->set_voltage) { 1804 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1805 &selector); 1806 1807 if (rdev->desc->ops->list_voltage) 1808 selector = rdev->desc->ops->list_voltage(rdev, 1809 selector); 1810 else 1811 selector = -1; 1812 } else if (rdev->desc->ops->set_voltage_sel) { 1813 int best_val = INT_MAX; 1814 int i; 1815 1816 selector = 0; 1817 1818 /* Find the smallest voltage that falls within the specified 1819 * range. 1820 */ 1821 for (i = 0; i < rdev->desc->n_voltages; i++) { 1822 ret = rdev->desc->ops->list_voltage(rdev, i); 1823 if (ret < 0) 1824 continue; 1825 1826 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1827 best_val = ret; 1828 selector = i; 1829 } 1830 } 1831 1832 /* 1833 * If we can't obtain the old selector there is not enough 1834 * info to call set_voltage_time_sel(). 1835 */ 1836 if (rdev->desc->ops->set_voltage_time_sel && 1837 rdev->desc->ops->get_voltage_sel) { 1838 unsigned int old_selector = 0; 1839 1840 ret = rdev->desc->ops->get_voltage_sel(rdev); 1841 if (ret < 0) 1842 return ret; 1843 old_selector = ret; 1844 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1845 old_selector, selector); 1846 } 1847 1848 if (best_val != INT_MAX) { 1849 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1850 selector = best_val; 1851 } else { 1852 ret = -EINVAL; 1853 } 1854 } else { 1855 ret = -EINVAL; 1856 } 1857 1858 /* Insert any necessary delays */ 1859 if (delay >= 1000) { 1860 mdelay(delay / 1000); 1861 udelay(delay % 1000); 1862 } else if (delay) { 1863 udelay(delay); 1864 } 1865 1866 if (ret == 0) 1867 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1868 NULL); 1869 1870 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1871 1872 return ret; 1873} 1874 1875/** 1876 * regulator_set_voltage - set regulator output voltage 1877 * @regulator: regulator source 1878 * @min_uV: Minimum required voltage in uV 1879 * @max_uV: Maximum acceptable voltage in uV 1880 * 1881 * Sets a voltage regulator to the desired output voltage. This can be set 1882 * during any regulator state. IOW, regulator can be disabled or enabled. 1883 * 1884 * If the regulator is enabled then the voltage will change to the new value 1885 * immediately otherwise if the regulator is disabled the regulator will 1886 * output at the new voltage when enabled. 1887 * 1888 * NOTE: If the regulator is shared between several devices then the lowest 1889 * request voltage that meets the system constraints will be used. 1890 * Regulator system constraints must be set for this regulator before 1891 * calling this function otherwise this call will fail. 1892 */ 1893int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1894{ 1895 struct regulator_dev *rdev = regulator->rdev; 1896 int ret = 0; 1897 1898 mutex_lock(&rdev->mutex); 1899 1900 /* If we're setting the same range as last time the change 1901 * should be a noop (some cpufreq implementations use the same 1902 * voltage for multiple frequencies, for example). 1903 */ 1904 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1905 goto out; 1906 1907 /* sanity check */ 1908 if (!rdev->desc->ops->set_voltage && 1909 !rdev->desc->ops->set_voltage_sel) { 1910 ret = -EINVAL; 1911 goto out; 1912 } 1913 1914 /* constraints check */ 1915 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1916 if (ret < 0) 1917 goto out; 1918 regulator->min_uV = min_uV; 1919 regulator->max_uV = max_uV; 1920 1921 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1922 if (ret < 0) 1923 goto out; 1924 1925 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1926 1927out: 1928 mutex_unlock(&rdev->mutex); 1929 return ret; 1930} 1931EXPORT_SYMBOL_GPL(regulator_set_voltage); 1932 1933/** 1934 * regulator_set_voltage_time - get raise/fall time 1935 * @regulator: regulator source 1936 * @old_uV: starting voltage in microvolts 1937 * @new_uV: target voltage in microvolts 1938 * 1939 * Provided with the starting and ending voltage, this function attempts to 1940 * calculate the time in microseconds required to rise or fall to this new 1941 * voltage. 1942 */ 1943int regulator_set_voltage_time(struct regulator *regulator, 1944 int old_uV, int new_uV) 1945{ 1946 struct regulator_dev *rdev = regulator->rdev; 1947 struct regulator_ops *ops = rdev->desc->ops; 1948 int old_sel = -1; 1949 int new_sel = -1; 1950 int voltage; 1951 int i; 1952 1953 /* Currently requires operations to do this */ 1954 if (!ops->list_voltage || !ops->set_voltage_time_sel 1955 || !rdev->desc->n_voltages) 1956 return -EINVAL; 1957 1958 for (i = 0; i < rdev->desc->n_voltages; i++) { 1959 /* We only look for exact voltage matches here */ 1960 voltage = regulator_list_voltage(regulator, i); 1961 if (voltage < 0) 1962 return -EINVAL; 1963 if (voltage == 0) 1964 continue; 1965 if (voltage == old_uV) 1966 old_sel = i; 1967 if (voltage == new_uV) 1968 new_sel = i; 1969 } 1970 1971 if (old_sel < 0 || new_sel < 0) 1972 return -EINVAL; 1973 1974 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 1975} 1976EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 1977 1978/** 1979 * regulator_sync_voltage - re-apply last regulator output voltage 1980 * @regulator: regulator source 1981 * 1982 * Re-apply the last configured voltage. This is intended to be used 1983 * where some external control source the consumer is cooperating with 1984 * has caused the configured voltage to change. 1985 */ 1986int regulator_sync_voltage(struct regulator *regulator) 1987{ 1988 struct regulator_dev *rdev = regulator->rdev; 1989 int ret, min_uV, max_uV; 1990 1991 mutex_lock(&rdev->mutex); 1992 1993 if (!rdev->desc->ops->set_voltage && 1994 !rdev->desc->ops->set_voltage_sel) { 1995 ret = -EINVAL; 1996 goto out; 1997 } 1998 1999 /* This is only going to work if we've had a voltage configured. */ 2000 if (!regulator->min_uV && !regulator->max_uV) { 2001 ret = -EINVAL; 2002 goto out; 2003 } 2004 2005 min_uV = regulator->min_uV; 2006 max_uV = regulator->max_uV; 2007 2008 /* This should be a paranoia check... */ 2009 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2010 if (ret < 0) 2011 goto out; 2012 2013 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2014 if (ret < 0) 2015 goto out; 2016 2017 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2018 2019out: 2020 mutex_unlock(&rdev->mutex); 2021 return ret; 2022} 2023EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2024 2025static int _regulator_get_voltage(struct regulator_dev *rdev) 2026{ 2027 int sel, ret; 2028 2029 if (rdev->desc->ops->get_voltage_sel) { 2030 sel = rdev->desc->ops->get_voltage_sel(rdev); 2031 if (sel < 0) 2032 return sel; 2033 ret = rdev->desc->ops->list_voltage(rdev, sel); 2034 } else if (rdev->desc->ops->get_voltage) { 2035 ret = rdev->desc->ops->get_voltage(rdev); 2036 } else { 2037 return -EINVAL; 2038 } 2039 2040 if (ret < 0) 2041 return ret; 2042 return ret - rdev->constraints->uV_offset; 2043} 2044 2045/** 2046 * regulator_get_voltage - get regulator output voltage 2047 * @regulator: regulator source 2048 * 2049 * This returns the current regulator voltage in uV. 2050 * 2051 * NOTE: If the regulator is disabled it will return the voltage value. This 2052 * function should not be used to determine regulator state. 2053 */ 2054int regulator_get_voltage(struct regulator *regulator) 2055{ 2056 int ret; 2057 2058 mutex_lock(®ulator->rdev->mutex); 2059 2060 ret = _regulator_get_voltage(regulator->rdev); 2061 2062 mutex_unlock(®ulator->rdev->mutex); 2063 2064 return ret; 2065} 2066EXPORT_SYMBOL_GPL(regulator_get_voltage); 2067 2068/** 2069 * regulator_set_current_limit - set regulator output current limit 2070 * @regulator: regulator source 2071 * @min_uA: Minimuum supported current in uA 2072 * @max_uA: Maximum supported current in uA 2073 * 2074 * Sets current sink to the desired output current. This can be set during 2075 * any regulator state. IOW, regulator can be disabled or enabled. 2076 * 2077 * If the regulator is enabled then the current will change to the new value 2078 * immediately otherwise if the regulator is disabled the regulator will 2079 * output at the new current when enabled. 2080 * 2081 * NOTE: Regulator system constraints must be set for this regulator before 2082 * calling this function otherwise this call will fail. 2083 */ 2084int regulator_set_current_limit(struct regulator *regulator, 2085 int min_uA, int max_uA) 2086{ 2087 struct regulator_dev *rdev = regulator->rdev; 2088 int ret; 2089 2090 mutex_lock(&rdev->mutex); 2091 2092 /* sanity check */ 2093 if (!rdev->desc->ops->set_current_limit) { 2094 ret = -EINVAL; 2095 goto out; 2096 } 2097 2098 /* constraints check */ 2099 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2100 if (ret < 0) 2101 goto out; 2102 2103 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2104out: 2105 mutex_unlock(&rdev->mutex); 2106 return ret; 2107} 2108EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2109 2110static int _regulator_get_current_limit(struct regulator_dev *rdev) 2111{ 2112 int ret; 2113 2114 mutex_lock(&rdev->mutex); 2115 2116 /* sanity check */ 2117 if (!rdev->desc->ops->get_current_limit) { 2118 ret = -EINVAL; 2119 goto out; 2120 } 2121 2122 ret = rdev->desc->ops->get_current_limit(rdev); 2123out: 2124 mutex_unlock(&rdev->mutex); 2125 return ret; 2126} 2127 2128/** 2129 * regulator_get_current_limit - get regulator output current 2130 * @regulator: regulator source 2131 * 2132 * This returns the current supplied by the specified current sink in uA. 2133 * 2134 * NOTE: If the regulator is disabled it will return the current value. This 2135 * function should not be used to determine regulator state. 2136 */ 2137int regulator_get_current_limit(struct regulator *regulator) 2138{ 2139 return _regulator_get_current_limit(regulator->rdev); 2140} 2141EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2142 2143/** 2144 * regulator_set_mode - set regulator operating mode 2145 * @regulator: regulator source 2146 * @mode: operating mode - one of the REGULATOR_MODE constants 2147 * 2148 * Set regulator operating mode to increase regulator efficiency or improve 2149 * regulation performance. 2150 * 2151 * NOTE: Regulator system constraints must be set for this regulator before 2152 * calling this function otherwise this call will fail. 2153 */ 2154int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2155{ 2156 struct regulator_dev *rdev = regulator->rdev; 2157 int ret; 2158 int regulator_curr_mode; 2159 2160 mutex_lock(&rdev->mutex); 2161 2162 /* sanity check */ 2163 if (!rdev->desc->ops->set_mode) { 2164 ret = -EINVAL; 2165 goto out; 2166 } 2167 2168 /* return if the same mode is requested */ 2169 if (rdev->desc->ops->get_mode) { 2170 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2171 if (regulator_curr_mode == mode) { 2172 ret = 0; 2173 goto out; 2174 } 2175 } 2176 2177 /* constraints check */ 2178 ret = regulator_mode_constrain(rdev, &mode); 2179 if (ret < 0) 2180 goto out; 2181 2182 ret = rdev->desc->ops->set_mode(rdev, mode); 2183out: 2184 mutex_unlock(&rdev->mutex); 2185 return ret; 2186} 2187EXPORT_SYMBOL_GPL(regulator_set_mode); 2188 2189static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2190{ 2191 int ret; 2192 2193 mutex_lock(&rdev->mutex); 2194 2195 /* sanity check */ 2196 if (!rdev->desc->ops->get_mode) { 2197 ret = -EINVAL; 2198 goto out; 2199 } 2200 2201 ret = rdev->desc->ops->get_mode(rdev); 2202out: 2203 mutex_unlock(&rdev->mutex); 2204 return ret; 2205} 2206 2207/** 2208 * regulator_get_mode - get regulator operating mode 2209 * @regulator: regulator source 2210 * 2211 * Get the current regulator operating mode. 2212 */ 2213unsigned int regulator_get_mode(struct regulator *regulator) 2214{ 2215 return _regulator_get_mode(regulator->rdev); 2216} 2217EXPORT_SYMBOL_GPL(regulator_get_mode); 2218 2219/** 2220 * regulator_set_optimum_mode - set regulator optimum operating mode 2221 * @regulator: regulator source 2222 * @uA_load: load current 2223 * 2224 * Notifies the regulator core of a new device load. This is then used by 2225 * DRMS (if enabled by constraints) to set the most efficient regulator 2226 * operating mode for the new regulator loading. 2227 * 2228 * Consumer devices notify their supply regulator of the maximum power 2229 * they will require (can be taken from device datasheet in the power 2230 * consumption tables) when they change operational status and hence power 2231 * state. Examples of operational state changes that can affect power 2232 * consumption are :- 2233 * 2234 * o Device is opened / closed. 2235 * o Device I/O is about to begin or has just finished. 2236 * o Device is idling in between work. 2237 * 2238 * This information is also exported via sysfs to userspace. 2239 * 2240 * DRMS will sum the total requested load on the regulator and change 2241 * to the most efficient operating mode if platform constraints allow. 2242 * 2243 * Returns the new regulator mode or error. 2244 */ 2245int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2246{ 2247 struct regulator_dev *rdev = regulator->rdev; 2248 struct regulator *consumer; 2249 int ret, output_uV, input_uV, total_uA_load = 0; 2250 unsigned int mode; 2251 2252 mutex_lock(&rdev->mutex); 2253 2254 /* 2255 * first check to see if we can set modes at all, otherwise just 2256 * tell the consumer everything is OK. 2257 */ 2258 regulator->uA_load = uA_load; 2259 ret = regulator_check_drms(rdev); 2260 if (ret < 0) { 2261 ret = 0; 2262 goto out; 2263 } 2264 2265 if (!rdev->desc->ops->get_optimum_mode) 2266 goto out; 2267 2268 /* 2269 * we can actually do this so any errors are indicators of 2270 * potential real failure. 2271 */ 2272 ret = -EINVAL; 2273 2274 /* get output voltage */ 2275 output_uV = _regulator_get_voltage(rdev); 2276 if (output_uV <= 0) { 2277 rdev_err(rdev, "invalid output voltage found\n"); 2278 goto out; 2279 } 2280 2281 /* get input voltage */ 2282 input_uV = 0; 2283 if (rdev->supply) 2284 input_uV = regulator_get_voltage(rdev->supply); 2285 if (input_uV <= 0) 2286 input_uV = rdev->constraints->input_uV; 2287 if (input_uV <= 0) { 2288 rdev_err(rdev, "invalid input voltage found\n"); 2289 goto out; 2290 } 2291 2292 /* calc total requested load for this regulator */ 2293 list_for_each_entry(consumer, &rdev->consumer_list, list) 2294 total_uA_load += consumer->uA_load; 2295 2296 mode = rdev->desc->ops->get_optimum_mode(rdev, 2297 input_uV, output_uV, 2298 total_uA_load); 2299 ret = regulator_mode_constrain(rdev, &mode); 2300 if (ret < 0) { 2301 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2302 total_uA_load, input_uV, output_uV); 2303 goto out; 2304 } 2305 2306 ret = rdev->desc->ops->set_mode(rdev, mode); 2307 if (ret < 0) { 2308 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2309 goto out; 2310 } 2311 ret = mode; 2312out: 2313 mutex_unlock(&rdev->mutex); 2314 return ret; 2315} 2316EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2317 2318/** 2319 * regulator_register_notifier - register regulator event notifier 2320 * @regulator: regulator source 2321 * @nb: notifier block 2322 * 2323 * Register notifier block to receive regulator events. 2324 */ 2325int regulator_register_notifier(struct regulator *regulator, 2326 struct notifier_block *nb) 2327{ 2328 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2329 nb); 2330} 2331EXPORT_SYMBOL_GPL(regulator_register_notifier); 2332 2333/** 2334 * regulator_unregister_notifier - unregister regulator event notifier 2335 * @regulator: regulator source 2336 * @nb: notifier block 2337 * 2338 * Unregister regulator event notifier block. 2339 */ 2340int regulator_unregister_notifier(struct regulator *regulator, 2341 struct notifier_block *nb) 2342{ 2343 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2344 nb); 2345} 2346EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2347 2348/* notify regulator consumers and downstream regulator consumers. 2349 * Note mutex must be held by caller. 2350 */ 2351static void _notifier_call_chain(struct regulator_dev *rdev, 2352 unsigned long event, void *data) 2353{ 2354 /* call rdev chain first */ 2355 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2356} 2357 2358/** 2359 * regulator_bulk_get - get multiple regulator consumers 2360 * 2361 * @dev: Device to supply 2362 * @num_consumers: Number of consumers to register 2363 * @consumers: Configuration of consumers; clients are stored here. 2364 * 2365 * @return 0 on success, an errno on failure. 2366 * 2367 * This helper function allows drivers to get several regulator 2368 * consumers in one operation. If any of the regulators cannot be 2369 * acquired then any regulators that were allocated will be freed 2370 * before returning to the caller. 2371 */ 2372int regulator_bulk_get(struct device *dev, int num_consumers, 2373 struct regulator_bulk_data *consumers) 2374{ 2375 int i; 2376 int ret; 2377 2378 for (i = 0; i < num_consumers; i++) 2379 consumers[i].consumer = NULL; 2380 2381 for (i = 0; i < num_consumers; i++) { 2382 consumers[i].consumer = regulator_get(dev, 2383 consumers[i].supply); 2384 if (IS_ERR(consumers[i].consumer)) { 2385 ret = PTR_ERR(consumers[i].consumer); 2386 dev_err(dev, "Failed to get supply '%s': %d\n", 2387 consumers[i].supply, ret); 2388 consumers[i].consumer = NULL; 2389 goto err; 2390 } 2391 } 2392 2393 return 0; 2394 2395err: 2396 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2397 regulator_put(consumers[i].consumer); 2398 2399 return ret; 2400} 2401EXPORT_SYMBOL_GPL(regulator_bulk_get); 2402 2403static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2404{ 2405 struct regulator_bulk_data *bulk = data; 2406 2407 bulk->ret = regulator_enable(bulk->consumer); 2408} 2409 2410/** 2411 * regulator_bulk_enable - enable multiple regulator consumers 2412 * 2413 * @num_consumers: Number of consumers 2414 * @consumers: Consumer data; clients are stored here. 2415 * @return 0 on success, an errno on failure 2416 * 2417 * This convenience API allows consumers to enable multiple regulator 2418 * clients in a single API call. If any consumers cannot be enabled 2419 * then any others that were enabled will be disabled again prior to 2420 * return. 2421 */ 2422int regulator_bulk_enable(int num_consumers, 2423 struct regulator_bulk_data *consumers) 2424{ 2425 LIST_HEAD(async_domain); 2426 int i; 2427 int ret = 0; 2428 2429 for (i = 0; i < num_consumers; i++) 2430 async_schedule_domain(regulator_bulk_enable_async, 2431 &consumers[i], &async_domain); 2432 2433 async_synchronize_full_domain(&async_domain); 2434 2435 /* If any consumer failed we need to unwind any that succeeded */ 2436 for (i = 0; i < num_consumers; i++) { 2437 if (consumers[i].ret != 0) { 2438 ret = consumers[i].ret; 2439 goto err; 2440 } 2441 } 2442 2443 return 0; 2444 2445err: 2446 for (i = 0; i < num_consumers; i++) 2447 if (consumers[i].ret == 0) 2448 regulator_disable(consumers[i].consumer); 2449 else 2450 pr_err("Failed to enable %s: %d\n", 2451 consumers[i].supply, consumers[i].ret); 2452 2453 return ret; 2454} 2455EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2456 2457/** 2458 * regulator_bulk_disable - disable multiple regulator consumers 2459 * 2460 * @num_consumers: Number of consumers 2461 * @consumers: Consumer data; clients are stored here. 2462 * @return 0 on success, an errno on failure 2463 * 2464 * This convenience API allows consumers to disable multiple regulator 2465 * clients in a single API call. If any consumers cannot be enabled 2466 * then any others that were disabled will be disabled again prior to 2467 * return. 2468 */ 2469int regulator_bulk_disable(int num_consumers, 2470 struct regulator_bulk_data *consumers) 2471{ 2472 int i; 2473 int ret; 2474 2475 for (i = 0; i < num_consumers; i++) { 2476 ret = regulator_disable(consumers[i].consumer); 2477 if (ret != 0) 2478 goto err; 2479 } 2480 2481 return 0; 2482 2483err: 2484 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2485 for (--i; i >= 0; --i) 2486 regulator_enable(consumers[i].consumer); 2487 2488 return ret; 2489} 2490EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2491 2492/** 2493 * regulator_bulk_free - free multiple regulator consumers 2494 * 2495 * @num_consumers: Number of consumers 2496 * @consumers: Consumer data; clients are stored here. 2497 * 2498 * This convenience API allows consumers to free multiple regulator 2499 * clients in a single API call. 2500 */ 2501void regulator_bulk_free(int num_consumers, 2502 struct regulator_bulk_data *consumers) 2503{ 2504 int i; 2505 2506 for (i = 0; i < num_consumers; i++) { 2507 regulator_put(consumers[i].consumer); 2508 consumers[i].consumer = NULL; 2509 } 2510} 2511EXPORT_SYMBOL_GPL(regulator_bulk_free); 2512 2513/** 2514 * regulator_notifier_call_chain - call regulator event notifier 2515 * @rdev: regulator source 2516 * @event: notifier block 2517 * @data: callback-specific data. 2518 * 2519 * Called by regulator drivers to notify clients a regulator event has 2520 * occurred. We also notify regulator clients downstream. 2521 * Note lock must be held by caller. 2522 */ 2523int regulator_notifier_call_chain(struct regulator_dev *rdev, 2524 unsigned long event, void *data) 2525{ 2526 _notifier_call_chain(rdev, event, data); 2527 return NOTIFY_DONE; 2528 2529} 2530EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2531 2532/** 2533 * regulator_mode_to_status - convert a regulator mode into a status 2534 * 2535 * @mode: Mode to convert 2536 * 2537 * Convert a regulator mode into a status. 2538 */ 2539int regulator_mode_to_status(unsigned int mode) 2540{ 2541 switch (mode) { 2542 case REGULATOR_MODE_FAST: 2543 return REGULATOR_STATUS_FAST; 2544 case REGULATOR_MODE_NORMAL: 2545 return REGULATOR_STATUS_NORMAL; 2546 case REGULATOR_MODE_IDLE: 2547 return REGULATOR_STATUS_IDLE; 2548 case REGULATOR_STATUS_STANDBY: 2549 return REGULATOR_STATUS_STANDBY; 2550 default: 2551 return 0; 2552 } 2553} 2554EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2555 2556/* 2557 * To avoid cluttering sysfs (and memory) with useless state, only 2558 * create attributes that can be meaningfully displayed. 2559 */ 2560static int add_regulator_attributes(struct regulator_dev *rdev) 2561{ 2562 struct device *dev = &rdev->dev; 2563 struct regulator_ops *ops = rdev->desc->ops; 2564 int status = 0; 2565 2566 /* some attributes need specific methods to be displayed */ 2567 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2568 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2569 status = device_create_file(dev, &dev_attr_microvolts); 2570 if (status < 0) 2571 return status; 2572 } 2573 if (ops->get_current_limit) { 2574 status = device_create_file(dev, &dev_attr_microamps); 2575 if (status < 0) 2576 return status; 2577 } 2578 if (ops->get_mode) { 2579 status = device_create_file(dev, &dev_attr_opmode); 2580 if (status < 0) 2581 return status; 2582 } 2583 if (ops->is_enabled) { 2584 status = device_create_file(dev, &dev_attr_state); 2585 if (status < 0) 2586 return status; 2587 } 2588 if (ops->get_status) { 2589 status = device_create_file(dev, &dev_attr_status); 2590 if (status < 0) 2591 return status; 2592 } 2593 2594 /* some attributes are type-specific */ 2595 if (rdev->desc->type == REGULATOR_CURRENT) { 2596 status = device_create_file(dev, &dev_attr_requested_microamps); 2597 if (status < 0) 2598 return status; 2599 } 2600 2601 /* all the other attributes exist to support constraints; 2602 * don't show them if there are no constraints, or if the 2603 * relevant supporting methods are missing. 2604 */ 2605 if (!rdev->constraints) 2606 return status; 2607 2608 /* constraints need specific supporting methods */ 2609 if (ops->set_voltage || ops->set_voltage_sel) { 2610 status = device_create_file(dev, &dev_attr_min_microvolts); 2611 if (status < 0) 2612 return status; 2613 status = device_create_file(dev, &dev_attr_max_microvolts); 2614 if (status < 0) 2615 return status; 2616 } 2617 if (ops->set_current_limit) { 2618 status = device_create_file(dev, &dev_attr_min_microamps); 2619 if (status < 0) 2620 return status; 2621 status = device_create_file(dev, &dev_attr_max_microamps); 2622 if (status < 0) 2623 return status; 2624 } 2625 2626 /* suspend mode constraints need multiple supporting methods */ 2627 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2628 return status; 2629 2630 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2631 if (status < 0) 2632 return status; 2633 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2634 if (status < 0) 2635 return status; 2636 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2637 if (status < 0) 2638 return status; 2639 2640 if (ops->set_suspend_voltage) { 2641 status = device_create_file(dev, 2642 &dev_attr_suspend_standby_microvolts); 2643 if (status < 0) 2644 return status; 2645 status = device_create_file(dev, 2646 &dev_attr_suspend_mem_microvolts); 2647 if (status < 0) 2648 return status; 2649 status = device_create_file(dev, 2650 &dev_attr_suspend_disk_microvolts); 2651 if (status < 0) 2652 return status; 2653 } 2654 2655 if (ops->set_suspend_mode) { 2656 status = device_create_file(dev, 2657 &dev_attr_suspend_standby_mode); 2658 if (status < 0) 2659 return status; 2660 status = device_create_file(dev, 2661 &dev_attr_suspend_mem_mode); 2662 if (status < 0) 2663 return status; 2664 status = device_create_file(dev, 2665 &dev_attr_suspend_disk_mode); 2666 if (status < 0) 2667 return status; 2668 } 2669 2670 return status; 2671} 2672 2673static void rdev_init_debugfs(struct regulator_dev *rdev) 2674{ 2675#ifdef CONFIG_DEBUG_FS 2676 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2677 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2678 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2679 rdev->debugfs = NULL; 2680 return; 2681 } 2682 2683 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2684 &rdev->use_count); 2685 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2686 &rdev->open_count); 2687#endif 2688} 2689 2690/** 2691 * regulator_register - register regulator 2692 * @regulator_desc: regulator to register 2693 * @dev: struct device for the regulator 2694 * @init_data: platform provided init data, passed through by driver 2695 * @driver_data: private regulator data 2696 * 2697 * Called by regulator drivers to register a regulator. 2698 * Returns 0 on success. 2699 */ 2700struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2701 struct device *dev, const struct regulator_init_data *init_data, 2702 void *driver_data, struct device_node *of_node) 2703{ 2704 const struct regulation_constraints *constraints = NULL; 2705 static atomic_t regulator_no = ATOMIC_INIT(0); 2706 struct regulator_dev *rdev; 2707 int ret, i; 2708 const char *supply = NULL; 2709 2710 if (regulator_desc == NULL) 2711 return ERR_PTR(-EINVAL); 2712 2713 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2714 return ERR_PTR(-EINVAL); 2715 2716 if (regulator_desc->type != REGULATOR_VOLTAGE && 2717 regulator_desc->type != REGULATOR_CURRENT) 2718 return ERR_PTR(-EINVAL); 2719 2720 /* Only one of each should be implemented */ 2721 WARN_ON(regulator_desc->ops->get_voltage && 2722 regulator_desc->ops->get_voltage_sel); 2723 WARN_ON(regulator_desc->ops->set_voltage && 2724 regulator_desc->ops->set_voltage_sel); 2725 2726 /* If we're using selectors we must implement list_voltage. */ 2727 if (regulator_desc->ops->get_voltage_sel && 2728 !regulator_desc->ops->list_voltage) { 2729 return ERR_PTR(-EINVAL); 2730 } 2731 if (regulator_desc->ops->set_voltage_sel && 2732 !regulator_desc->ops->list_voltage) { 2733 return ERR_PTR(-EINVAL); 2734 } 2735 2736 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2737 if (rdev == NULL) 2738 return ERR_PTR(-ENOMEM); 2739 2740 mutex_lock(®ulator_list_mutex); 2741 2742 mutex_init(&rdev->mutex); 2743 rdev->reg_data = driver_data; 2744 rdev->owner = regulator_desc->owner; 2745 rdev->desc = regulator_desc; 2746 INIT_LIST_HEAD(&rdev->consumer_list); 2747 INIT_LIST_HEAD(&rdev->list); 2748 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2749 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2750 2751 /* preform any regulator specific init */ 2752 if (init_data && init_data->regulator_init) { 2753 ret = init_data->regulator_init(rdev->reg_data); 2754 if (ret < 0) 2755 goto clean; 2756 } 2757 2758 /* register with sysfs */ 2759 rdev->dev.class = ®ulator_class; 2760 rdev->dev.of_node = of_node; 2761 rdev->dev.parent = dev; 2762 dev_set_name(&rdev->dev, "regulator.%d", 2763 atomic_inc_return(®ulator_no) - 1); 2764 ret = device_register(&rdev->dev); 2765 if (ret != 0) { 2766 put_device(&rdev->dev); 2767 goto clean; 2768 } 2769 2770 dev_set_drvdata(&rdev->dev, rdev); 2771 2772 /* set regulator constraints */ 2773 if (init_data) 2774 constraints = &init_data->constraints; 2775 2776 ret = set_machine_constraints(rdev, constraints); 2777 if (ret < 0) 2778 goto scrub; 2779 2780 /* add attributes supported by this regulator */ 2781 ret = add_regulator_attributes(rdev); 2782 if (ret < 0) 2783 goto scrub; 2784 2785 if (init_data && init_data->supply_regulator) 2786 supply = init_data->supply_regulator; 2787 else if (regulator_desc->supply_name) 2788 supply = regulator_desc->supply_name; 2789 2790 if (supply) { 2791 struct regulator_dev *r; 2792 2793 r = regulator_dev_lookup(dev, supply); 2794 2795 if (!r) { 2796 dev_err(dev, "Failed to find supply %s\n", supply); 2797 ret = -ENODEV; 2798 goto scrub; 2799 } 2800 2801 ret = set_supply(rdev, r); 2802 if (ret < 0) 2803 goto scrub; 2804 } 2805 2806 /* add consumers devices */ 2807 if (init_data) { 2808 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2809 ret = set_consumer_device_supply(rdev, 2810 init_data->consumer_supplies[i].dev, 2811 init_data->consumer_supplies[i].dev_name, 2812 init_data->consumer_supplies[i].supply); 2813 if (ret < 0) { 2814 dev_err(dev, "Failed to set supply %s\n", 2815 init_data->consumer_supplies[i].supply); 2816 goto unset_supplies; 2817 } 2818 } 2819 } 2820 2821 list_add(&rdev->list, ®ulator_list); 2822 2823 rdev_init_debugfs(rdev); 2824out: 2825 mutex_unlock(®ulator_list_mutex); 2826 return rdev; 2827 2828unset_supplies: 2829 unset_regulator_supplies(rdev); 2830 2831scrub: 2832 kfree(rdev->constraints); 2833 device_unregister(&rdev->dev); 2834 /* device core frees rdev */ 2835 rdev = ERR_PTR(ret); 2836 goto out; 2837 2838clean: 2839 kfree(rdev); 2840 rdev = ERR_PTR(ret); 2841 goto out; 2842} 2843EXPORT_SYMBOL_GPL(regulator_register); 2844 2845/** 2846 * regulator_unregister - unregister regulator 2847 * @rdev: regulator to unregister 2848 * 2849 * Called by regulator drivers to unregister a regulator. 2850 */ 2851void regulator_unregister(struct regulator_dev *rdev) 2852{ 2853 if (rdev == NULL) 2854 return; 2855 2856 mutex_lock(®ulator_list_mutex); 2857#ifdef CONFIG_DEBUG_FS 2858 debugfs_remove_recursive(rdev->debugfs); 2859#endif 2860 flush_work_sync(&rdev->disable_work.work); 2861 WARN_ON(rdev->open_count); 2862 unset_regulator_supplies(rdev); 2863 list_del(&rdev->list); 2864 if (rdev->supply) 2865 regulator_put(rdev->supply); 2866 kfree(rdev->constraints); 2867 device_unregister(&rdev->dev); 2868 mutex_unlock(®ulator_list_mutex); 2869} 2870EXPORT_SYMBOL_GPL(regulator_unregister); 2871 2872/** 2873 * regulator_suspend_prepare - prepare regulators for system wide suspend 2874 * @state: system suspend state 2875 * 2876 * Configure each regulator with it's suspend operating parameters for state. 2877 * This will usually be called by machine suspend code prior to supending. 2878 */ 2879int regulator_suspend_prepare(suspend_state_t state) 2880{ 2881 struct regulator_dev *rdev; 2882 int ret = 0; 2883 2884 /* ON is handled by regulator active state */ 2885 if (state == PM_SUSPEND_ON) 2886 return -EINVAL; 2887 2888 mutex_lock(®ulator_list_mutex); 2889 list_for_each_entry(rdev, ®ulator_list, list) { 2890 2891 mutex_lock(&rdev->mutex); 2892 ret = suspend_prepare(rdev, state); 2893 mutex_unlock(&rdev->mutex); 2894 2895 if (ret < 0) { 2896 rdev_err(rdev, "failed to prepare\n"); 2897 goto out; 2898 } 2899 } 2900out: 2901 mutex_unlock(®ulator_list_mutex); 2902 return ret; 2903} 2904EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2905 2906/** 2907 * regulator_suspend_finish - resume regulators from system wide suspend 2908 * 2909 * Turn on regulators that might be turned off by regulator_suspend_prepare 2910 * and that should be turned on according to the regulators properties. 2911 */ 2912int regulator_suspend_finish(void) 2913{ 2914 struct regulator_dev *rdev; 2915 int ret = 0, error; 2916 2917 mutex_lock(®ulator_list_mutex); 2918 list_for_each_entry(rdev, ®ulator_list, list) { 2919 struct regulator_ops *ops = rdev->desc->ops; 2920 2921 mutex_lock(&rdev->mutex); 2922 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 2923 ops->enable) { 2924 error = ops->enable(rdev); 2925 if (error) 2926 ret = error; 2927 } else { 2928 if (!has_full_constraints) 2929 goto unlock; 2930 if (!ops->disable) 2931 goto unlock; 2932 if (ops->is_enabled && !ops->is_enabled(rdev)) 2933 goto unlock; 2934 2935 error = ops->disable(rdev); 2936 if (error) 2937 ret = error; 2938 } 2939unlock: 2940 mutex_unlock(&rdev->mutex); 2941 } 2942 mutex_unlock(®ulator_list_mutex); 2943 return ret; 2944} 2945EXPORT_SYMBOL_GPL(regulator_suspend_finish); 2946 2947/** 2948 * regulator_has_full_constraints - the system has fully specified constraints 2949 * 2950 * Calling this function will cause the regulator API to disable all 2951 * regulators which have a zero use count and don't have an always_on 2952 * constraint in a late_initcall. 2953 * 2954 * The intention is that this will become the default behaviour in a 2955 * future kernel release so users are encouraged to use this facility 2956 * now. 2957 */ 2958void regulator_has_full_constraints(void) 2959{ 2960 has_full_constraints = 1; 2961} 2962EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2963 2964/** 2965 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2966 * 2967 * Calling this function will cause the regulator API to provide a 2968 * dummy regulator to consumers if no physical regulator is found, 2969 * allowing most consumers to proceed as though a regulator were 2970 * configured. This allows systems such as those with software 2971 * controllable regulators for the CPU core only to be brought up more 2972 * readily. 2973 */ 2974void regulator_use_dummy_regulator(void) 2975{ 2976 board_wants_dummy_regulator = true; 2977} 2978EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2979 2980/** 2981 * rdev_get_drvdata - get rdev regulator driver data 2982 * @rdev: regulator 2983 * 2984 * Get rdev regulator driver private data. This call can be used in the 2985 * regulator driver context. 2986 */ 2987void *rdev_get_drvdata(struct regulator_dev *rdev) 2988{ 2989 return rdev->reg_data; 2990} 2991EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2992 2993/** 2994 * regulator_get_drvdata - get regulator driver data 2995 * @regulator: regulator 2996 * 2997 * Get regulator driver private data. This call can be used in the consumer 2998 * driver context when non API regulator specific functions need to be called. 2999 */ 3000void *regulator_get_drvdata(struct regulator *regulator) 3001{ 3002 return regulator->rdev->reg_data; 3003} 3004EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3005 3006/** 3007 * regulator_set_drvdata - set regulator driver data 3008 * @regulator: regulator 3009 * @data: data 3010 */ 3011void regulator_set_drvdata(struct regulator *regulator, void *data) 3012{ 3013 regulator->rdev->reg_data = data; 3014} 3015EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3016 3017/** 3018 * regulator_get_id - get regulator ID 3019 * @rdev: regulator 3020 */ 3021int rdev_get_id(struct regulator_dev *rdev) 3022{ 3023 return rdev->desc->id; 3024} 3025EXPORT_SYMBOL_GPL(rdev_get_id); 3026 3027struct device *rdev_get_dev(struct regulator_dev *rdev) 3028{ 3029 return &rdev->dev; 3030} 3031EXPORT_SYMBOL_GPL(rdev_get_dev); 3032 3033void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3034{ 3035 return reg_init_data->driver_data; 3036} 3037EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3038 3039#ifdef CONFIG_DEBUG_FS 3040static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3041 size_t count, loff_t *ppos) 3042{ 3043 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3044 ssize_t len, ret = 0; 3045 struct regulator_map *map; 3046 3047 if (!buf) 3048 return -ENOMEM; 3049 3050 list_for_each_entry(map, ®ulator_map_list, list) { 3051 len = snprintf(buf + ret, PAGE_SIZE - ret, 3052 "%s -> %s.%s\n", 3053 rdev_get_name(map->regulator), map->dev_name, 3054 map->supply); 3055 if (len >= 0) 3056 ret += len; 3057 if (ret > PAGE_SIZE) { 3058 ret = PAGE_SIZE; 3059 break; 3060 } 3061 } 3062 3063 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3064 3065 kfree(buf); 3066 3067 return ret; 3068} 3069 3070static const struct file_operations supply_map_fops = { 3071 .read = supply_map_read_file, 3072 .llseek = default_llseek, 3073}; 3074#endif 3075 3076static int __init regulator_init(void) 3077{ 3078 int ret; 3079 3080 ret = class_register(®ulator_class); 3081 3082#ifdef CONFIG_DEBUG_FS 3083 debugfs_root = debugfs_create_dir("regulator", NULL); 3084 if (IS_ERR(debugfs_root) || !debugfs_root) { 3085 pr_warn("regulator: Failed to create debugfs directory\n"); 3086 debugfs_root = NULL; 3087 } 3088 3089 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3090 NULL, &supply_map_fops))) 3091 pr_warn("regulator: Failed to create supplies debugfs\n"); 3092#endif 3093 3094 regulator_dummy_init(); 3095 3096 return ret; 3097} 3098 3099/* init early to allow our consumers to complete system booting */ 3100core_initcall(regulator_init); 3101 3102static int __init regulator_init_complete(void) 3103{ 3104 struct regulator_dev *rdev; 3105 struct regulator_ops *ops; 3106 struct regulation_constraints *c; 3107 int enabled, ret; 3108 3109 mutex_lock(®ulator_list_mutex); 3110 3111 /* If we have a full configuration then disable any regulators 3112 * which are not in use or always_on. This will become the 3113 * default behaviour in the future. 3114 */ 3115 list_for_each_entry(rdev, ®ulator_list, list) { 3116 ops = rdev->desc->ops; 3117 c = rdev->constraints; 3118 3119 if (!ops->disable || (c && c->always_on)) 3120 continue; 3121 3122 mutex_lock(&rdev->mutex); 3123 3124 if (rdev->use_count) 3125 goto unlock; 3126 3127 /* If we can't read the status assume it's on. */ 3128 if (ops->is_enabled) 3129 enabled = ops->is_enabled(rdev); 3130 else 3131 enabled = 1; 3132 3133 if (!enabled) 3134 goto unlock; 3135 3136 if (has_full_constraints) { 3137 /* We log since this may kill the system if it 3138 * goes wrong. */ 3139 rdev_info(rdev, "disabling\n"); 3140 ret = ops->disable(rdev); 3141 if (ret != 0) { 3142 rdev_err(rdev, "couldn't disable: %d\n", ret); 3143 } 3144 } else { 3145 /* The intention is that in future we will 3146 * assume that full constraints are provided 3147 * so warn even if we aren't going to do 3148 * anything here. 3149 */ 3150 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3151 } 3152 3153unlock: 3154 mutex_unlock(&rdev->mutex); 3155 } 3156 3157 mutex_unlock(®ulator_list_mutex); 3158 3159 return 0; 3160} 3161late_initcall(regulator_init_complete); 3162