core.c revision 737f360d5bef5e01c6cfa755dca0b449a154c1e0
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 * 1007 * Only one of consumer_dev and consumer_dev_name may be specified. 1008 */ 1009static int set_consumer_device_supply(struct regulator_dev *rdev, 1010 const char *consumer_dev_name, 1011 const char *supply) 1012{ 1013 struct regulator_map *node; 1014 int has_dev; 1015 1016 if (supply == NULL) 1017 return -EINVAL; 1018 1019 if (consumer_dev_name != NULL) 1020 has_dev = 1; 1021 else 1022 has_dev = 0; 1023 1024 list_for_each_entry(node, ®ulator_map_list, list) { 1025 if (node->dev_name && consumer_dev_name) { 1026 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1027 continue; 1028 } else if (node->dev_name || consumer_dev_name) { 1029 continue; 1030 } 1031 1032 if (strcmp(node->supply, supply) != 0) 1033 continue; 1034 1035 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1036 consumer_dev_name, 1037 dev_name(&node->regulator->dev), 1038 node->regulator->desc->name, 1039 supply, 1040 dev_name(&rdev->dev), rdev_get_name(rdev)); 1041 return -EBUSY; 1042 } 1043 1044 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1045 if (node == NULL) 1046 return -ENOMEM; 1047 1048 node->regulator = rdev; 1049 node->supply = supply; 1050 1051 if (has_dev) { 1052 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1053 if (node->dev_name == NULL) { 1054 kfree(node); 1055 return -ENOMEM; 1056 } 1057 } 1058 1059 list_add(&node->list, ®ulator_map_list); 1060 return 0; 1061} 1062 1063static void unset_regulator_supplies(struct regulator_dev *rdev) 1064{ 1065 struct regulator_map *node, *n; 1066 1067 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1068 if (rdev == node->regulator) { 1069 list_del(&node->list); 1070 kfree(node->dev_name); 1071 kfree(node); 1072 } 1073 } 1074} 1075 1076#define REG_STR_SIZE 64 1077 1078static struct regulator *create_regulator(struct regulator_dev *rdev, 1079 struct device *dev, 1080 const char *supply_name) 1081{ 1082 struct regulator *regulator; 1083 char buf[REG_STR_SIZE]; 1084 int err, size; 1085 1086 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1087 if (regulator == NULL) 1088 return NULL; 1089 1090 mutex_lock(&rdev->mutex); 1091 regulator->rdev = rdev; 1092 list_add(®ulator->list, &rdev->consumer_list); 1093 1094 if (dev) { 1095 /* create a 'requested_microamps_name' sysfs entry */ 1096 size = scnprintf(buf, REG_STR_SIZE, 1097 "microamps_requested_%s-%s", 1098 dev_name(dev), supply_name); 1099 if (size >= REG_STR_SIZE) 1100 goto overflow_err; 1101 1102 regulator->dev = dev; 1103 sysfs_attr_init(®ulator->dev_attr.attr); 1104 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1105 if (regulator->dev_attr.attr.name == NULL) 1106 goto attr_name_err; 1107 1108 regulator->dev_attr.attr.mode = 0444; 1109 regulator->dev_attr.show = device_requested_uA_show; 1110 err = device_create_file(dev, ®ulator->dev_attr); 1111 if (err < 0) { 1112 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1113 goto attr_name_err; 1114 } 1115 1116 /* also add a link to the device sysfs entry */ 1117 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1118 dev->kobj.name, supply_name); 1119 if (size >= REG_STR_SIZE) 1120 goto attr_err; 1121 1122 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1123 if (regulator->supply_name == NULL) 1124 goto attr_err; 1125 1126 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1127 buf); 1128 if (err) { 1129 rdev_warn(rdev, "could not add device link %s err %d\n", 1130 dev->kobj.name, err); 1131 goto link_name_err; 1132 } 1133 } else { 1134 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1135 if (regulator->supply_name == NULL) 1136 goto attr_err; 1137 } 1138 1139#ifdef CONFIG_DEBUG_FS 1140 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1141 rdev->debugfs); 1142 if (IS_ERR_OR_NULL(regulator->debugfs)) { 1143 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1144 regulator->debugfs = NULL; 1145 } else { 1146 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1147 ®ulator->uA_load); 1148 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1149 ®ulator->min_uV); 1150 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1151 ®ulator->max_uV); 1152 } 1153#endif 1154 1155 mutex_unlock(&rdev->mutex); 1156 return regulator; 1157link_name_err: 1158 kfree(regulator->supply_name); 1159attr_err: 1160 device_remove_file(regulator->dev, ®ulator->dev_attr); 1161attr_name_err: 1162 kfree(regulator->dev_attr.attr.name); 1163overflow_err: 1164 list_del(®ulator->list); 1165 kfree(regulator); 1166 mutex_unlock(&rdev->mutex); 1167 return NULL; 1168} 1169 1170static int _regulator_get_enable_time(struct regulator_dev *rdev) 1171{ 1172 if (!rdev->desc->ops->enable_time) 1173 return 0; 1174 return rdev->desc->ops->enable_time(rdev); 1175} 1176 1177static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1178 const char *supply) 1179{ 1180 struct regulator_dev *r; 1181 struct device_node *node; 1182 1183 /* first do a dt based lookup */ 1184 if (dev && dev->of_node) { 1185 node = of_get_regulator(dev, supply); 1186 if (node) 1187 list_for_each_entry(r, ®ulator_list, list) 1188 if (r->dev.parent && 1189 node == r->dev.of_node) 1190 return r; 1191 } 1192 1193 /* if not found, try doing it non-dt way */ 1194 list_for_each_entry(r, ®ulator_list, list) 1195 if (strcmp(rdev_get_name(r), supply) == 0) 1196 return r; 1197 1198 return NULL; 1199} 1200 1201/* Internal regulator request function */ 1202static struct regulator *_regulator_get(struct device *dev, const char *id, 1203 int exclusive) 1204{ 1205 struct regulator_dev *rdev; 1206 struct regulator_map *map; 1207 struct regulator *regulator = ERR_PTR(-ENODEV); 1208 const char *devname = NULL; 1209 int ret; 1210 1211 if (id == NULL) { 1212 pr_err("get() with no identifier\n"); 1213 return regulator; 1214 } 1215 1216 if (dev) 1217 devname = dev_name(dev); 1218 1219 mutex_lock(®ulator_list_mutex); 1220 1221 rdev = regulator_dev_lookup(dev, id); 1222 if (rdev) 1223 goto found; 1224 1225 list_for_each_entry(map, ®ulator_map_list, list) { 1226 /* If the mapping has a device set up it must match */ 1227 if (map->dev_name && 1228 (!devname || strcmp(map->dev_name, devname))) 1229 continue; 1230 1231 if (strcmp(map->supply, id) == 0) { 1232 rdev = map->regulator; 1233 goto found; 1234 } 1235 } 1236 1237 if (board_wants_dummy_regulator) { 1238 rdev = dummy_regulator_rdev; 1239 goto found; 1240 } 1241 1242#ifdef CONFIG_REGULATOR_DUMMY 1243 if (!devname) 1244 devname = "deviceless"; 1245 1246 /* If the board didn't flag that it was fully constrained then 1247 * substitute in a dummy regulator so consumers can continue. 1248 */ 1249 if (!has_full_constraints) { 1250 pr_warn("%s supply %s not found, using dummy regulator\n", 1251 devname, id); 1252 rdev = dummy_regulator_rdev; 1253 goto found; 1254 } 1255#endif 1256 1257 mutex_unlock(®ulator_list_mutex); 1258 return regulator; 1259 1260found: 1261 if (rdev->exclusive) { 1262 regulator = ERR_PTR(-EPERM); 1263 goto out; 1264 } 1265 1266 if (exclusive && rdev->open_count) { 1267 regulator = ERR_PTR(-EBUSY); 1268 goto out; 1269 } 1270 1271 if (!try_module_get(rdev->owner)) 1272 goto out; 1273 1274 regulator = create_regulator(rdev, dev, id); 1275 if (regulator == NULL) { 1276 regulator = ERR_PTR(-ENOMEM); 1277 module_put(rdev->owner); 1278 goto out; 1279 } 1280 1281 rdev->open_count++; 1282 if (exclusive) { 1283 rdev->exclusive = 1; 1284 1285 ret = _regulator_is_enabled(rdev); 1286 if (ret > 0) 1287 rdev->use_count = 1; 1288 else 1289 rdev->use_count = 0; 1290 } 1291 1292out: 1293 mutex_unlock(®ulator_list_mutex); 1294 1295 return regulator; 1296} 1297 1298/** 1299 * regulator_get - lookup and obtain a reference to a regulator. 1300 * @dev: device for regulator "consumer" 1301 * @id: Supply name or regulator ID. 1302 * 1303 * Returns a struct regulator corresponding to the regulator producer, 1304 * or IS_ERR() condition containing errno. 1305 * 1306 * Use of supply names configured via regulator_set_device_supply() is 1307 * strongly encouraged. It is recommended that the supply name used 1308 * should match the name used for the supply and/or the relevant 1309 * device pins in the datasheet. 1310 */ 1311struct regulator *regulator_get(struct device *dev, const char *id) 1312{ 1313 return _regulator_get(dev, id, 0); 1314} 1315EXPORT_SYMBOL_GPL(regulator_get); 1316 1317/** 1318 * regulator_get_exclusive - obtain exclusive access to a regulator. 1319 * @dev: device for regulator "consumer" 1320 * @id: Supply name or regulator ID. 1321 * 1322 * Returns a struct regulator corresponding to the regulator producer, 1323 * or IS_ERR() condition containing errno. Other consumers will be 1324 * unable to obtain this reference is held and the use count for the 1325 * regulator will be initialised to reflect the current state of the 1326 * regulator. 1327 * 1328 * This is intended for use by consumers which cannot tolerate shared 1329 * use of the regulator such as those which need to force the 1330 * regulator off for correct operation of the hardware they are 1331 * controlling. 1332 * 1333 * Use of supply names configured via regulator_set_device_supply() is 1334 * strongly encouraged. It is recommended that the supply name used 1335 * should match the name used for the supply and/or the relevant 1336 * device pins in the datasheet. 1337 */ 1338struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1339{ 1340 return _regulator_get(dev, id, 1); 1341} 1342EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1343 1344/** 1345 * regulator_put - "free" the regulator source 1346 * @regulator: regulator source 1347 * 1348 * Note: drivers must ensure that all regulator_enable calls made on this 1349 * regulator source are balanced by regulator_disable calls prior to calling 1350 * this function. 1351 */ 1352void regulator_put(struct regulator *regulator) 1353{ 1354 struct regulator_dev *rdev; 1355 1356 if (regulator == NULL || IS_ERR(regulator)) 1357 return; 1358 1359 mutex_lock(®ulator_list_mutex); 1360 rdev = regulator->rdev; 1361 1362#ifdef CONFIG_DEBUG_FS 1363 debugfs_remove_recursive(regulator->debugfs); 1364#endif 1365 1366 /* remove any sysfs entries */ 1367 if (regulator->dev) { 1368 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1369 device_remove_file(regulator->dev, ®ulator->dev_attr); 1370 kfree(regulator->dev_attr.attr.name); 1371 } 1372 kfree(regulator->supply_name); 1373 list_del(®ulator->list); 1374 kfree(regulator); 1375 1376 rdev->open_count--; 1377 rdev->exclusive = 0; 1378 1379 module_put(rdev->owner); 1380 mutex_unlock(®ulator_list_mutex); 1381} 1382EXPORT_SYMBOL_GPL(regulator_put); 1383 1384static int _regulator_can_change_status(struct regulator_dev *rdev) 1385{ 1386 if (!rdev->constraints) 1387 return 0; 1388 1389 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1390 return 1; 1391 else 1392 return 0; 1393} 1394 1395/* locks held by regulator_enable() */ 1396static int _regulator_enable(struct regulator_dev *rdev) 1397{ 1398 int ret, delay; 1399 1400 /* check voltage and requested load before enabling */ 1401 if (rdev->constraints && 1402 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1403 drms_uA_update(rdev); 1404 1405 if (rdev->use_count == 0) { 1406 /* The regulator may on if it's not switchable or left on */ 1407 ret = _regulator_is_enabled(rdev); 1408 if (ret == -EINVAL || ret == 0) { 1409 if (!_regulator_can_change_status(rdev)) 1410 return -EPERM; 1411 1412 if (!rdev->desc->ops->enable) 1413 return -EINVAL; 1414 1415 /* Query before enabling in case configuration 1416 * dependent. */ 1417 ret = _regulator_get_enable_time(rdev); 1418 if (ret >= 0) { 1419 delay = ret; 1420 } else { 1421 rdev_warn(rdev, "enable_time() failed: %d\n", 1422 ret); 1423 delay = 0; 1424 } 1425 1426 trace_regulator_enable(rdev_get_name(rdev)); 1427 1428 /* Allow the regulator to ramp; it would be useful 1429 * to extend this for bulk operations so that the 1430 * regulators can ramp together. */ 1431 ret = rdev->desc->ops->enable(rdev); 1432 if (ret < 0) 1433 return ret; 1434 1435 trace_regulator_enable_delay(rdev_get_name(rdev)); 1436 1437 if (delay >= 1000) { 1438 mdelay(delay / 1000); 1439 udelay(delay % 1000); 1440 } else if (delay) { 1441 udelay(delay); 1442 } 1443 1444 trace_regulator_enable_complete(rdev_get_name(rdev)); 1445 1446 } else if (ret < 0) { 1447 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1448 return ret; 1449 } 1450 /* Fallthrough on positive return values - already enabled */ 1451 } 1452 1453 rdev->use_count++; 1454 1455 return 0; 1456} 1457 1458/** 1459 * regulator_enable - enable regulator output 1460 * @regulator: regulator source 1461 * 1462 * Request that the regulator be enabled with the regulator output at 1463 * the predefined voltage or current value. Calls to regulator_enable() 1464 * must be balanced with calls to regulator_disable(). 1465 * 1466 * NOTE: the output value can be set by other drivers, boot loader or may be 1467 * hardwired in the regulator. 1468 */ 1469int regulator_enable(struct regulator *regulator) 1470{ 1471 struct regulator_dev *rdev = regulator->rdev; 1472 int ret = 0; 1473 1474 if (rdev->supply) { 1475 ret = regulator_enable(rdev->supply); 1476 if (ret != 0) 1477 return ret; 1478 } 1479 1480 mutex_lock(&rdev->mutex); 1481 ret = _regulator_enable(rdev); 1482 mutex_unlock(&rdev->mutex); 1483 1484 if (ret != 0 && rdev->supply) 1485 regulator_disable(rdev->supply); 1486 1487 return ret; 1488} 1489EXPORT_SYMBOL_GPL(regulator_enable); 1490 1491/* locks held by regulator_disable() */ 1492static int _regulator_disable(struct regulator_dev *rdev) 1493{ 1494 int ret = 0; 1495 1496 if (WARN(rdev->use_count <= 0, 1497 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1498 return -EIO; 1499 1500 /* are we the last user and permitted to disable ? */ 1501 if (rdev->use_count == 1 && 1502 (rdev->constraints && !rdev->constraints->always_on)) { 1503 1504 /* we are last user */ 1505 if (_regulator_can_change_status(rdev) && 1506 rdev->desc->ops->disable) { 1507 trace_regulator_disable(rdev_get_name(rdev)); 1508 1509 ret = rdev->desc->ops->disable(rdev); 1510 if (ret < 0) { 1511 rdev_err(rdev, "failed to disable\n"); 1512 return ret; 1513 } 1514 1515 trace_regulator_disable_complete(rdev_get_name(rdev)); 1516 1517 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1518 NULL); 1519 } 1520 1521 rdev->use_count = 0; 1522 } else if (rdev->use_count > 1) { 1523 1524 if (rdev->constraints && 1525 (rdev->constraints->valid_ops_mask & 1526 REGULATOR_CHANGE_DRMS)) 1527 drms_uA_update(rdev); 1528 1529 rdev->use_count--; 1530 } 1531 1532 return ret; 1533} 1534 1535/** 1536 * regulator_disable - disable regulator output 1537 * @regulator: regulator source 1538 * 1539 * Disable the regulator output voltage or current. Calls to 1540 * regulator_enable() must be balanced with calls to 1541 * regulator_disable(). 1542 * 1543 * NOTE: this will only disable the regulator output if no other consumer 1544 * devices have it enabled, the regulator device supports disabling and 1545 * machine constraints permit this operation. 1546 */ 1547int regulator_disable(struct regulator *regulator) 1548{ 1549 struct regulator_dev *rdev = regulator->rdev; 1550 int ret = 0; 1551 1552 mutex_lock(&rdev->mutex); 1553 ret = _regulator_disable(rdev); 1554 mutex_unlock(&rdev->mutex); 1555 1556 if (ret == 0 && rdev->supply) 1557 regulator_disable(rdev->supply); 1558 1559 return ret; 1560} 1561EXPORT_SYMBOL_GPL(regulator_disable); 1562 1563/* locks held by regulator_force_disable() */ 1564static int _regulator_force_disable(struct regulator_dev *rdev) 1565{ 1566 int ret = 0; 1567 1568 /* force disable */ 1569 if (rdev->desc->ops->disable) { 1570 /* ah well, who wants to live forever... */ 1571 ret = rdev->desc->ops->disable(rdev); 1572 if (ret < 0) { 1573 rdev_err(rdev, "failed to force disable\n"); 1574 return ret; 1575 } 1576 /* notify other consumers that power has been forced off */ 1577 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1578 REGULATOR_EVENT_DISABLE, NULL); 1579 } 1580 1581 return ret; 1582} 1583 1584/** 1585 * regulator_force_disable - force disable regulator output 1586 * @regulator: regulator source 1587 * 1588 * Forcibly disable the regulator output voltage or current. 1589 * NOTE: this *will* disable the regulator output even if other consumer 1590 * devices have it enabled. This should be used for situations when device 1591 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1592 */ 1593int regulator_force_disable(struct regulator *regulator) 1594{ 1595 struct regulator_dev *rdev = regulator->rdev; 1596 int ret; 1597 1598 mutex_lock(&rdev->mutex); 1599 regulator->uA_load = 0; 1600 ret = _regulator_force_disable(regulator->rdev); 1601 mutex_unlock(&rdev->mutex); 1602 1603 if (rdev->supply) 1604 while (rdev->open_count--) 1605 regulator_disable(rdev->supply); 1606 1607 return ret; 1608} 1609EXPORT_SYMBOL_GPL(regulator_force_disable); 1610 1611static void regulator_disable_work(struct work_struct *work) 1612{ 1613 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1614 disable_work.work); 1615 int count, i, ret; 1616 1617 mutex_lock(&rdev->mutex); 1618 1619 BUG_ON(!rdev->deferred_disables); 1620 1621 count = rdev->deferred_disables; 1622 rdev->deferred_disables = 0; 1623 1624 for (i = 0; i < count; i++) { 1625 ret = _regulator_disable(rdev); 1626 if (ret != 0) 1627 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1628 } 1629 1630 mutex_unlock(&rdev->mutex); 1631 1632 if (rdev->supply) { 1633 for (i = 0; i < count; i++) { 1634 ret = regulator_disable(rdev->supply); 1635 if (ret != 0) { 1636 rdev_err(rdev, 1637 "Supply disable failed: %d\n", ret); 1638 } 1639 } 1640 } 1641} 1642 1643/** 1644 * regulator_disable_deferred - disable regulator output with delay 1645 * @regulator: regulator source 1646 * @ms: miliseconds until the regulator is disabled 1647 * 1648 * Execute regulator_disable() on the regulator after a delay. This 1649 * is intended for use with devices that require some time to quiesce. 1650 * 1651 * NOTE: this will only disable the regulator output if no other consumer 1652 * devices have it enabled, the regulator device supports disabling and 1653 * machine constraints permit this operation. 1654 */ 1655int regulator_disable_deferred(struct regulator *regulator, int ms) 1656{ 1657 struct regulator_dev *rdev = regulator->rdev; 1658 int ret; 1659 1660 mutex_lock(&rdev->mutex); 1661 rdev->deferred_disables++; 1662 mutex_unlock(&rdev->mutex); 1663 1664 ret = schedule_delayed_work(&rdev->disable_work, 1665 msecs_to_jiffies(ms)); 1666 if (ret < 0) 1667 return ret; 1668 else 1669 return 0; 1670} 1671EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1672 1673static int _regulator_is_enabled(struct regulator_dev *rdev) 1674{ 1675 /* If we don't know then assume that the regulator is always on */ 1676 if (!rdev->desc->ops->is_enabled) 1677 return 1; 1678 1679 return rdev->desc->ops->is_enabled(rdev); 1680} 1681 1682/** 1683 * regulator_is_enabled - is the regulator output enabled 1684 * @regulator: regulator source 1685 * 1686 * Returns positive if the regulator driver backing the source/client 1687 * has requested that the device be enabled, zero if it hasn't, else a 1688 * negative errno code. 1689 * 1690 * Note that the device backing this regulator handle can have multiple 1691 * users, so it might be enabled even if regulator_enable() was never 1692 * called for this particular source. 1693 */ 1694int regulator_is_enabled(struct regulator *regulator) 1695{ 1696 int ret; 1697 1698 mutex_lock(®ulator->rdev->mutex); 1699 ret = _regulator_is_enabled(regulator->rdev); 1700 mutex_unlock(®ulator->rdev->mutex); 1701 1702 return ret; 1703} 1704EXPORT_SYMBOL_GPL(regulator_is_enabled); 1705 1706/** 1707 * regulator_count_voltages - count regulator_list_voltage() selectors 1708 * @regulator: regulator source 1709 * 1710 * Returns number of selectors, or negative errno. Selectors are 1711 * numbered starting at zero, and typically correspond to bitfields 1712 * in hardware registers. 1713 */ 1714int regulator_count_voltages(struct regulator *regulator) 1715{ 1716 struct regulator_dev *rdev = regulator->rdev; 1717 1718 return rdev->desc->n_voltages ? : -EINVAL; 1719} 1720EXPORT_SYMBOL_GPL(regulator_count_voltages); 1721 1722/** 1723 * regulator_list_voltage - enumerate supported voltages 1724 * @regulator: regulator source 1725 * @selector: identify voltage to list 1726 * Context: can sleep 1727 * 1728 * Returns a voltage that can be passed to @regulator_set_voltage(), 1729 * zero if this selector code can't be used on this system, or a 1730 * negative errno. 1731 */ 1732int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1733{ 1734 struct regulator_dev *rdev = regulator->rdev; 1735 struct regulator_ops *ops = rdev->desc->ops; 1736 int ret; 1737 1738 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1739 return -EINVAL; 1740 1741 mutex_lock(&rdev->mutex); 1742 ret = ops->list_voltage(rdev, selector); 1743 mutex_unlock(&rdev->mutex); 1744 1745 if (ret > 0) { 1746 if (ret < rdev->constraints->min_uV) 1747 ret = 0; 1748 else if (ret > rdev->constraints->max_uV) 1749 ret = 0; 1750 } 1751 1752 return ret; 1753} 1754EXPORT_SYMBOL_GPL(regulator_list_voltage); 1755 1756/** 1757 * regulator_is_supported_voltage - check if a voltage range can be supported 1758 * 1759 * @regulator: Regulator to check. 1760 * @min_uV: Minimum required voltage in uV. 1761 * @max_uV: Maximum required voltage in uV. 1762 * 1763 * Returns a boolean or a negative error code. 1764 */ 1765int regulator_is_supported_voltage(struct regulator *regulator, 1766 int min_uV, int max_uV) 1767{ 1768 int i, voltages, ret; 1769 1770 ret = regulator_count_voltages(regulator); 1771 if (ret < 0) 1772 return ret; 1773 voltages = ret; 1774 1775 for (i = 0; i < voltages; i++) { 1776 ret = regulator_list_voltage(regulator, i); 1777 1778 if (ret >= min_uV && ret <= max_uV) 1779 return 1; 1780 } 1781 1782 return 0; 1783} 1784EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1785 1786static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1787 int min_uV, int max_uV) 1788{ 1789 int ret; 1790 int delay = 0; 1791 unsigned int selector; 1792 1793 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1794 1795 min_uV += rdev->constraints->uV_offset; 1796 max_uV += rdev->constraints->uV_offset; 1797 1798 if (rdev->desc->ops->set_voltage) { 1799 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1800 &selector); 1801 1802 if (rdev->desc->ops->list_voltage) 1803 selector = rdev->desc->ops->list_voltage(rdev, 1804 selector); 1805 else 1806 selector = -1; 1807 } else if (rdev->desc->ops->set_voltage_sel) { 1808 int best_val = INT_MAX; 1809 int i; 1810 1811 selector = 0; 1812 1813 /* Find the smallest voltage that falls within the specified 1814 * range. 1815 */ 1816 for (i = 0; i < rdev->desc->n_voltages; i++) { 1817 ret = rdev->desc->ops->list_voltage(rdev, i); 1818 if (ret < 0) 1819 continue; 1820 1821 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1822 best_val = ret; 1823 selector = i; 1824 } 1825 } 1826 1827 /* 1828 * If we can't obtain the old selector there is not enough 1829 * info to call set_voltage_time_sel(). 1830 */ 1831 if (rdev->desc->ops->set_voltage_time_sel && 1832 rdev->desc->ops->get_voltage_sel) { 1833 unsigned int old_selector = 0; 1834 1835 ret = rdev->desc->ops->get_voltage_sel(rdev); 1836 if (ret < 0) 1837 return ret; 1838 old_selector = ret; 1839 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 1840 old_selector, selector); 1841 } 1842 1843 if (best_val != INT_MAX) { 1844 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1845 selector = best_val; 1846 } else { 1847 ret = -EINVAL; 1848 } 1849 } else { 1850 ret = -EINVAL; 1851 } 1852 1853 /* Insert any necessary delays */ 1854 if (delay >= 1000) { 1855 mdelay(delay / 1000); 1856 udelay(delay % 1000); 1857 } else if (delay) { 1858 udelay(delay); 1859 } 1860 1861 if (ret == 0) 1862 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1863 NULL); 1864 1865 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1866 1867 return ret; 1868} 1869 1870/** 1871 * regulator_set_voltage - set regulator output voltage 1872 * @regulator: regulator source 1873 * @min_uV: Minimum required voltage in uV 1874 * @max_uV: Maximum acceptable voltage in uV 1875 * 1876 * Sets a voltage regulator to the desired output voltage. This can be set 1877 * during any regulator state. IOW, regulator can be disabled or enabled. 1878 * 1879 * If the regulator is enabled then the voltage will change to the new value 1880 * immediately otherwise if the regulator is disabled the regulator will 1881 * output at the new voltage when enabled. 1882 * 1883 * NOTE: If the regulator is shared between several devices then the lowest 1884 * request voltage that meets the system constraints will be used. 1885 * Regulator system constraints must be set for this regulator before 1886 * calling this function otherwise this call will fail. 1887 */ 1888int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1889{ 1890 struct regulator_dev *rdev = regulator->rdev; 1891 int ret = 0; 1892 1893 mutex_lock(&rdev->mutex); 1894 1895 /* If we're setting the same range as last time the change 1896 * should be a noop (some cpufreq implementations use the same 1897 * voltage for multiple frequencies, for example). 1898 */ 1899 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1900 goto out; 1901 1902 /* sanity check */ 1903 if (!rdev->desc->ops->set_voltage && 1904 !rdev->desc->ops->set_voltage_sel) { 1905 ret = -EINVAL; 1906 goto out; 1907 } 1908 1909 /* constraints check */ 1910 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1911 if (ret < 0) 1912 goto out; 1913 regulator->min_uV = min_uV; 1914 regulator->max_uV = max_uV; 1915 1916 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1917 if (ret < 0) 1918 goto out; 1919 1920 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1921 1922out: 1923 mutex_unlock(&rdev->mutex); 1924 return ret; 1925} 1926EXPORT_SYMBOL_GPL(regulator_set_voltage); 1927 1928/** 1929 * regulator_set_voltage_time - get raise/fall time 1930 * @regulator: regulator source 1931 * @old_uV: starting voltage in microvolts 1932 * @new_uV: target voltage in microvolts 1933 * 1934 * Provided with the starting and ending voltage, this function attempts to 1935 * calculate the time in microseconds required to rise or fall to this new 1936 * voltage. 1937 */ 1938int regulator_set_voltage_time(struct regulator *regulator, 1939 int old_uV, int new_uV) 1940{ 1941 struct regulator_dev *rdev = regulator->rdev; 1942 struct regulator_ops *ops = rdev->desc->ops; 1943 int old_sel = -1; 1944 int new_sel = -1; 1945 int voltage; 1946 int i; 1947 1948 /* Currently requires operations to do this */ 1949 if (!ops->list_voltage || !ops->set_voltage_time_sel 1950 || !rdev->desc->n_voltages) 1951 return -EINVAL; 1952 1953 for (i = 0; i < rdev->desc->n_voltages; i++) { 1954 /* We only look for exact voltage matches here */ 1955 voltage = regulator_list_voltage(regulator, i); 1956 if (voltage < 0) 1957 return -EINVAL; 1958 if (voltage == 0) 1959 continue; 1960 if (voltage == old_uV) 1961 old_sel = i; 1962 if (voltage == new_uV) 1963 new_sel = i; 1964 } 1965 1966 if (old_sel < 0 || new_sel < 0) 1967 return -EINVAL; 1968 1969 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 1970} 1971EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 1972 1973/** 1974 * regulator_sync_voltage - re-apply last regulator output voltage 1975 * @regulator: regulator source 1976 * 1977 * Re-apply the last configured voltage. This is intended to be used 1978 * where some external control source the consumer is cooperating with 1979 * has caused the configured voltage to change. 1980 */ 1981int regulator_sync_voltage(struct regulator *regulator) 1982{ 1983 struct regulator_dev *rdev = regulator->rdev; 1984 int ret, min_uV, max_uV; 1985 1986 mutex_lock(&rdev->mutex); 1987 1988 if (!rdev->desc->ops->set_voltage && 1989 !rdev->desc->ops->set_voltage_sel) { 1990 ret = -EINVAL; 1991 goto out; 1992 } 1993 1994 /* This is only going to work if we've had a voltage configured. */ 1995 if (!regulator->min_uV && !regulator->max_uV) { 1996 ret = -EINVAL; 1997 goto out; 1998 } 1999 2000 min_uV = regulator->min_uV; 2001 max_uV = regulator->max_uV; 2002 2003 /* This should be a paranoia check... */ 2004 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2005 if (ret < 0) 2006 goto out; 2007 2008 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2009 if (ret < 0) 2010 goto out; 2011 2012 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2013 2014out: 2015 mutex_unlock(&rdev->mutex); 2016 return ret; 2017} 2018EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2019 2020static int _regulator_get_voltage(struct regulator_dev *rdev) 2021{ 2022 int sel, ret; 2023 2024 if (rdev->desc->ops->get_voltage_sel) { 2025 sel = rdev->desc->ops->get_voltage_sel(rdev); 2026 if (sel < 0) 2027 return sel; 2028 ret = rdev->desc->ops->list_voltage(rdev, sel); 2029 } else if (rdev->desc->ops->get_voltage) { 2030 ret = rdev->desc->ops->get_voltage(rdev); 2031 } else { 2032 return -EINVAL; 2033 } 2034 2035 if (ret < 0) 2036 return ret; 2037 return ret - rdev->constraints->uV_offset; 2038} 2039 2040/** 2041 * regulator_get_voltage - get regulator output voltage 2042 * @regulator: regulator source 2043 * 2044 * This returns the current regulator voltage in uV. 2045 * 2046 * NOTE: If the regulator is disabled it will return the voltage value. This 2047 * function should not be used to determine regulator state. 2048 */ 2049int regulator_get_voltage(struct regulator *regulator) 2050{ 2051 int ret; 2052 2053 mutex_lock(®ulator->rdev->mutex); 2054 2055 ret = _regulator_get_voltage(regulator->rdev); 2056 2057 mutex_unlock(®ulator->rdev->mutex); 2058 2059 return ret; 2060} 2061EXPORT_SYMBOL_GPL(regulator_get_voltage); 2062 2063/** 2064 * regulator_set_current_limit - set regulator output current limit 2065 * @regulator: regulator source 2066 * @min_uA: Minimuum supported current in uA 2067 * @max_uA: Maximum supported current in uA 2068 * 2069 * Sets current sink to the desired output current. This can be set during 2070 * any regulator state. IOW, regulator can be disabled or enabled. 2071 * 2072 * If the regulator is enabled then the current will change to the new value 2073 * immediately otherwise if the regulator is disabled the regulator will 2074 * output at the new current when enabled. 2075 * 2076 * NOTE: Regulator system constraints must be set for this regulator before 2077 * calling this function otherwise this call will fail. 2078 */ 2079int regulator_set_current_limit(struct regulator *regulator, 2080 int min_uA, int max_uA) 2081{ 2082 struct regulator_dev *rdev = regulator->rdev; 2083 int ret; 2084 2085 mutex_lock(&rdev->mutex); 2086 2087 /* sanity check */ 2088 if (!rdev->desc->ops->set_current_limit) { 2089 ret = -EINVAL; 2090 goto out; 2091 } 2092 2093 /* constraints check */ 2094 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2095 if (ret < 0) 2096 goto out; 2097 2098 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2099out: 2100 mutex_unlock(&rdev->mutex); 2101 return ret; 2102} 2103EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2104 2105static int _regulator_get_current_limit(struct regulator_dev *rdev) 2106{ 2107 int ret; 2108 2109 mutex_lock(&rdev->mutex); 2110 2111 /* sanity check */ 2112 if (!rdev->desc->ops->get_current_limit) { 2113 ret = -EINVAL; 2114 goto out; 2115 } 2116 2117 ret = rdev->desc->ops->get_current_limit(rdev); 2118out: 2119 mutex_unlock(&rdev->mutex); 2120 return ret; 2121} 2122 2123/** 2124 * regulator_get_current_limit - get regulator output current 2125 * @regulator: regulator source 2126 * 2127 * This returns the current supplied by the specified current sink in uA. 2128 * 2129 * NOTE: If the regulator is disabled it will return the current value. This 2130 * function should not be used to determine regulator state. 2131 */ 2132int regulator_get_current_limit(struct regulator *regulator) 2133{ 2134 return _regulator_get_current_limit(regulator->rdev); 2135} 2136EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2137 2138/** 2139 * regulator_set_mode - set regulator operating mode 2140 * @regulator: regulator source 2141 * @mode: operating mode - one of the REGULATOR_MODE constants 2142 * 2143 * Set regulator operating mode to increase regulator efficiency or improve 2144 * regulation performance. 2145 * 2146 * NOTE: Regulator system constraints must be set for this regulator before 2147 * calling this function otherwise this call will fail. 2148 */ 2149int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2150{ 2151 struct regulator_dev *rdev = regulator->rdev; 2152 int ret; 2153 int regulator_curr_mode; 2154 2155 mutex_lock(&rdev->mutex); 2156 2157 /* sanity check */ 2158 if (!rdev->desc->ops->set_mode) { 2159 ret = -EINVAL; 2160 goto out; 2161 } 2162 2163 /* return if the same mode is requested */ 2164 if (rdev->desc->ops->get_mode) { 2165 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2166 if (regulator_curr_mode == mode) { 2167 ret = 0; 2168 goto out; 2169 } 2170 } 2171 2172 /* constraints check */ 2173 ret = regulator_mode_constrain(rdev, &mode); 2174 if (ret < 0) 2175 goto out; 2176 2177 ret = rdev->desc->ops->set_mode(rdev, mode); 2178out: 2179 mutex_unlock(&rdev->mutex); 2180 return ret; 2181} 2182EXPORT_SYMBOL_GPL(regulator_set_mode); 2183 2184static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2185{ 2186 int ret; 2187 2188 mutex_lock(&rdev->mutex); 2189 2190 /* sanity check */ 2191 if (!rdev->desc->ops->get_mode) { 2192 ret = -EINVAL; 2193 goto out; 2194 } 2195 2196 ret = rdev->desc->ops->get_mode(rdev); 2197out: 2198 mutex_unlock(&rdev->mutex); 2199 return ret; 2200} 2201 2202/** 2203 * regulator_get_mode - get regulator operating mode 2204 * @regulator: regulator source 2205 * 2206 * Get the current regulator operating mode. 2207 */ 2208unsigned int regulator_get_mode(struct regulator *regulator) 2209{ 2210 return _regulator_get_mode(regulator->rdev); 2211} 2212EXPORT_SYMBOL_GPL(regulator_get_mode); 2213 2214/** 2215 * regulator_set_optimum_mode - set regulator optimum operating mode 2216 * @regulator: regulator source 2217 * @uA_load: load current 2218 * 2219 * Notifies the regulator core of a new device load. This is then used by 2220 * DRMS (if enabled by constraints) to set the most efficient regulator 2221 * operating mode for the new regulator loading. 2222 * 2223 * Consumer devices notify their supply regulator of the maximum power 2224 * they will require (can be taken from device datasheet in the power 2225 * consumption tables) when they change operational status and hence power 2226 * state. Examples of operational state changes that can affect power 2227 * consumption are :- 2228 * 2229 * o Device is opened / closed. 2230 * o Device I/O is about to begin or has just finished. 2231 * o Device is idling in between work. 2232 * 2233 * This information is also exported via sysfs to userspace. 2234 * 2235 * DRMS will sum the total requested load on the regulator and change 2236 * to the most efficient operating mode if platform constraints allow. 2237 * 2238 * Returns the new regulator mode or error. 2239 */ 2240int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2241{ 2242 struct regulator_dev *rdev = regulator->rdev; 2243 struct regulator *consumer; 2244 int ret, output_uV, input_uV, total_uA_load = 0; 2245 unsigned int mode; 2246 2247 mutex_lock(&rdev->mutex); 2248 2249 /* 2250 * first check to see if we can set modes at all, otherwise just 2251 * tell the consumer everything is OK. 2252 */ 2253 regulator->uA_load = uA_load; 2254 ret = regulator_check_drms(rdev); 2255 if (ret < 0) { 2256 ret = 0; 2257 goto out; 2258 } 2259 2260 if (!rdev->desc->ops->get_optimum_mode) 2261 goto out; 2262 2263 /* 2264 * we can actually do this so any errors are indicators of 2265 * potential real failure. 2266 */ 2267 ret = -EINVAL; 2268 2269 /* get output voltage */ 2270 output_uV = _regulator_get_voltage(rdev); 2271 if (output_uV <= 0) { 2272 rdev_err(rdev, "invalid output voltage found\n"); 2273 goto out; 2274 } 2275 2276 /* get input voltage */ 2277 input_uV = 0; 2278 if (rdev->supply) 2279 input_uV = regulator_get_voltage(rdev->supply); 2280 if (input_uV <= 0) 2281 input_uV = rdev->constraints->input_uV; 2282 if (input_uV <= 0) { 2283 rdev_err(rdev, "invalid input voltage found\n"); 2284 goto out; 2285 } 2286 2287 /* calc total requested load for this regulator */ 2288 list_for_each_entry(consumer, &rdev->consumer_list, list) 2289 total_uA_load += consumer->uA_load; 2290 2291 mode = rdev->desc->ops->get_optimum_mode(rdev, 2292 input_uV, output_uV, 2293 total_uA_load); 2294 ret = regulator_mode_constrain(rdev, &mode); 2295 if (ret < 0) { 2296 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2297 total_uA_load, input_uV, output_uV); 2298 goto out; 2299 } 2300 2301 ret = rdev->desc->ops->set_mode(rdev, mode); 2302 if (ret < 0) { 2303 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2304 goto out; 2305 } 2306 ret = mode; 2307out: 2308 mutex_unlock(&rdev->mutex); 2309 return ret; 2310} 2311EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2312 2313/** 2314 * regulator_register_notifier - register regulator event notifier 2315 * @regulator: regulator source 2316 * @nb: notifier block 2317 * 2318 * Register notifier block to receive regulator events. 2319 */ 2320int regulator_register_notifier(struct regulator *regulator, 2321 struct notifier_block *nb) 2322{ 2323 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2324 nb); 2325} 2326EXPORT_SYMBOL_GPL(regulator_register_notifier); 2327 2328/** 2329 * regulator_unregister_notifier - unregister regulator event notifier 2330 * @regulator: regulator source 2331 * @nb: notifier block 2332 * 2333 * Unregister regulator event notifier block. 2334 */ 2335int regulator_unregister_notifier(struct regulator *regulator, 2336 struct notifier_block *nb) 2337{ 2338 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2339 nb); 2340} 2341EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2342 2343/* notify regulator consumers and downstream regulator consumers. 2344 * Note mutex must be held by caller. 2345 */ 2346static void _notifier_call_chain(struct regulator_dev *rdev, 2347 unsigned long event, void *data) 2348{ 2349 /* call rdev chain first */ 2350 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2351} 2352 2353/** 2354 * regulator_bulk_get - get multiple regulator consumers 2355 * 2356 * @dev: Device to supply 2357 * @num_consumers: Number of consumers to register 2358 * @consumers: Configuration of consumers; clients are stored here. 2359 * 2360 * @return 0 on success, an errno on failure. 2361 * 2362 * This helper function allows drivers to get several regulator 2363 * consumers in one operation. If any of the regulators cannot be 2364 * acquired then any regulators that were allocated will be freed 2365 * before returning to the caller. 2366 */ 2367int regulator_bulk_get(struct device *dev, int num_consumers, 2368 struct regulator_bulk_data *consumers) 2369{ 2370 int i; 2371 int ret; 2372 2373 for (i = 0; i < num_consumers; i++) 2374 consumers[i].consumer = NULL; 2375 2376 for (i = 0; i < num_consumers; i++) { 2377 consumers[i].consumer = regulator_get(dev, 2378 consumers[i].supply); 2379 if (IS_ERR(consumers[i].consumer)) { 2380 ret = PTR_ERR(consumers[i].consumer); 2381 dev_err(dev, "Failed to get supply '%s': %d\n", 2382 consumers[i].supply, ret); 2383 consumers[i].consumer = NULL; 2384 goto err; 2385 } 2386 } 2387 2388 return 0; 2389 2390err: 2391 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2392 regulator_put(consumers[i].consumer); 2393 2394 return ret; 2395} 2396EXPORT_SYMBOL_GPL(regulator_bulk_get); 2397 2398static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2399{ 2400 struct regulator_bulk_data *bulk = data; 2401 2402 bulk->ret = regulator_enable(bulk->consumer); 2403} 2404 2405/** 2406 * regulator_bulk_enable - enable multiple regulator consumers 2407 * 2408 * @num_consumers: Number of consumers 2409 * @consumers: Consumer data; clients are stored here. 2410 * @return 0 on success, an errno on failure 2411 * 2412 * This convenience API allows consumers to enable multiple regulator 2413 * clients in a single API call. If any consumers cannot be enabled 2414 * then any others that were enabled will be disabled again prior to 2415 * return. 2416 */ 2417int regulator_bulk_enable(int num_consumers, 2418 struct regulator_bulk_data *consumers) 2419{ 2420 LIST_HEAD(async_domain); 2421 int i; 2422 int ret = 0; 2423 2424 for (i = 0; i < num_consumers; i++) 2425 async_schedule_domain(regulator_bulk_enable_async, 2426 &consumers[i], &async_domain); 2427 2428 async_synchronize_full_domain(&async_domain); 2429 2430 /* If any consumer failed we need to unwind any that succeeded */ 2431 for (i = 0; i < num_consumers; i++) { 2432 if (consumers[i].ret != 0) { 2433 ret = consumers[i].ret; 2434 goto err; 2435 } 2436 } 2437 2438 return 0; 2439 2440err: 2441 for (i = 0; i < num_consumers; i++) 2442 if (consumers[i].ret == 0) 2443 regulator_disable(consumers[i].consumer); 2444 else 2445 pr_err("Failed to enable %s: %d\n", 2446 consumers[i].supply, consumers[i].ret); 2447 2448 return ret; 2449} 2450EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2451 2452/** 2453 * regulator_bulk_disable - disable multiple regulator consumers 2454 * 2455 * @num_consumers: Number of consumers 2456 * @consumers: Consumer data; clients are stored here. 2457 * @return 0 on success, an errno on failure 2458 * 2459 * This convenience API allows consumers to disable multiple regulator 2460 * clients in a single API call. If any consumers cannot be enabled 2461 * then any others that were disabled will be disabled again prior to 2462 * return. 2463 */ 2464int regulator_bulk_disable(int num_consumers, 2465 struct regulator_bulk_data *consumers) 2466{ 2467 int i; 2468 int ret; 2469 2470 for (i = 0; i < num_consumers; i++) { 2471 ret = regulator_disable(consumers[i].consumer); 2472 if (ret != 0) 2473 goto err; 2474 } 2475 2476 return 0; 2477 2478err: 2479 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2480 for (--i; i >= 0; --i) 2481 regulator_enable(consumers[i].consumer); 2482 2483 return ret; 2484} 2485EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2486 2487/** 2488 * regulator_bulk_force_disable - force disable multiple regulator consumers 2489 * 2490 * @num_consumers: Number of consumers 2491 * @consumers: Consumer data; clients are stored here. 2492 * @return 0 on success, an errno on failure 2493 * 2494 * This convenience API allows consumers to forcibly disable multiple regulator 2495 * clients in a single API call. 2496 * NOTE: This should be used for situations when device damage will 2497 * likely occur if the regulators are not disabled (e.g. over temp). 2498 * Although regulator_force_disable function call for some consumers can 2499 * return error numbers, the function is called for all consumers. 2500 */ 2501int regulator_bulk_force_disable(int num_consumers, 2502 struct regulator_bulk_data *consumers) 2503{ 2504 int i; 2505 int ret; 2506 2507 for (i = 0; i < num_consumers; i++) 2508 consumers[i].ret = 2509 regulator_force_disable(consumers[i].consumer); 2510 2511 for (i = 0; i < num_consumers; i++) { 2512 if (consumers[i].ret != 0) { 2513 ret = consumers[i].ret; 2514 goto out; 2515 } 2516 } 2517 2518 return 0; 2519out: 2520 return ret; 2521} 2522EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2523 2524/** 2525 * regulator_bulk_free - free multiple regulator consumers 2526 * 2527 * @num_consumers: Number of consumers 2528 * @consumers: Consumer data; clients are stored here. 2529 * 2530 * This convenience API allows consumers to free multiple regulator 2531 * clients in a single API call. 2532 */ 2533void regulator_bulk_free(int num_consumers, 2534 struct regulator_bulk_data *consumers) 2535{ 2536 int i; 2537 2538 for (i = 0; i < num_consumers; i++) { 2539 regulator_put(consumers[i].consumer); 2540 consumers[i].consumer = NULL; 2541 } 2542} 2543EXPORT_SYMBOL_GPL(regulator_bulk_free); 2544 2545/** 2546 * regulator_notifier_call_chain - call regulator event notifier 2547 * @rdev: regulator source 2548 * @event: notifier block 2549 * @data: callback-specific data. 2550 * 2551 * Called by regulator drivers to notify clients a regulator event has 2552 * occurred. We also notify regulator clients downstream. 2553 * Note lock must be held by caller. 2554 */ 2555int regulator_notifier_call_chain(struct regulator_dev *rdev, 2556 unsigned long event, void *data) 2557{ 2558 _notifier_call_chain(rdev, event, data); 2559 return NOTIFY_DONE; 2560 2561} 2562EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2563 2564/** 2565 * regulator_mode_to_status - convert a regulator mode into a status 2566 * 2567 * @mode: Mode to convert 2568 * 2569 * Convert a regulator mode into a status. 2570 */ 2571int regulator_mode_to_status(unsigned int mode) 2572{ 2573 switch (mode) { 2574 case REGULATOR_MODE_FAST: 2575 return REGULATOR_STATUS_FAST; 2576 case REGULATOR_MODE_NORMAL: 2577 return REGULATOR_STATUS_NORMAL; 2578 case REGULATOR_MODE_IDLE: 2579 return REGULATOR_STATUS_IDLE; 2580 case REGULATOR_STATUS_STANDBY: 2581 return REGULATOR_STATUS_STANDBY; 2582 default: 2583 return 0; 2584 } 2585} 2586EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2587 2588/* 2589 * To avoid cluttering sysfs (and memory) with useless state, only 2590 * create attributes that can be meaningfully displayed. 2591 */ 2592static int add_regulator_attributes(struct regulator_dev *rdev) 2593{ 2594 struct device *dev = &rdev->dev; 2595 struct regulator_ops *ops = rdev->desc->ops; 2596 int status = 0; 2597 2598 /* some attributes need specific methods to be displayed */ 2599 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2600 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2601 status = device_create_file(dev, &dev_attr_microvolts); 2602 if (status < 0) 2603 return status; 2604 } 2605 if (ops->get_current_limit) { 2606 status = device_create_file(dev, &dev_attr_microamps); 2607 if (status < 0) 2608 return status; 2609 } 2610 if (ops->get_mode) { 2611 status = device_create_file(dev, &dev_attr_opmode); 2612 if (status < 0) 2613 return status; 2614 } 2615 if (ops->is_enabled) { 2616 status = device_create_file(dev, &dev_attr_state); 2617 if (status < 0) 2618 return status; 2619 } 2620 if (ops->get_status) { 2621 status = device_create_file(dev, &dev_attr_status); 2622 if (status < 0) 2623 return status; 2624 } 2625 2626 /* some attributes are type-specific */ 2627 if (rdev->desc->type == REGULATOR_CURRENT) { 2628 status = device_create_file(dev, &dev_attr_requested_microamps); 2629 if (status < 0) 2630 return status; 2631 } 2632 2633 /* all the other attributes exist to support constraints; 2634 * don't show them if there are no constraints, or if the 2635 * relevant supporting methods are missing. 2636 */ 2637 if (!rdev->constraints) 2638 return status; 2639 2640 /* constraints need specific supporting methods */ 2641 if (ops->set_voltage || ops->set_voltage_sel) { 2642 status = device_create_file(dev, &dev_attr_min_microvolts); 2643 if (status < 0) 2644 return status; 2645 status = device_create_file(dev, &dev_attr_max_microvolts); 2646 if (status < 0) 2647 return status; 2648 } 2649 if (ops->set_current_limit) { 2650 status = device_create_file(dev, &dev_attr_min_microamps); 2651 if (status < 0) 2652 return status; 2653 status = device_create_file(dev, &dev_attr_max_microamps); 2654 if (status < 0) 2655 return status; 2656 } 2657 2658 /* suspend mode constraints need multiple supporting methods */ 2659 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2660 return status; 2661 2662 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2663 if (status < 0) 2664 return status; 2665 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2666 if (status < 0) 2667 return status; 2668 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2669 if (status < 0) 2670 return status; 2671 2672 if (ops->set_suspend_voltage) { 2673 status = device_create_file(dev, 2674 &dev_attr_suspend_standby_microvolts); 2675 if (status < 0) 2676 return status; 2677 status = device_create_file(dev, 2678 &dev_attr_suspend_mem_microvolts); 2679 if (status < 0) 2680 return status; 2681 status = device_create_file(dev, 2682 &dev_attr_suspend_disk_microvolts); 2683 if (status < 0) 2684 return status; 2685 } 2686 2687 if (ops->set_suspend_mode) { 2688 status = device_create_file(dev, 2689 &dev_attr_suspend_standby_mode); 2690 if (status < 0) 2691 return status; 2692 status = device_create_file(dev, 2693 &dev_attr_suspend_mem_mode); 2694 if (status < 0) 2695 return status; 2696 status = device_create_file(dev, 2697 &dev_attr_suspend_disk_mode); 2698 if (status < 0) 2699 return status; 2700 } 2701 2702 return status; 2703} 2704 2705static void rdev_init_debugfs(struct regulator_dev *rdev) 2706{ 2707#ifdef CONFIG_DEBUG_FS 2708 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2709 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2710 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2711 rdev->debugfs = NULL; 2712 return; 2713 } 2714 2715 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2716 &rdev->use_count); 2717 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2718 &rdev->open_count); 2719#endif 2720} 2721 2722/** 2723 * regulator_register - register regulator 2724 * @regulator_desc: regulator to register 2725 * @dev: struct device for the regulator 2726 * @init_data: platform provided init data, passed through by driver 2727 * @driver_data: private regulator data 2728 * @of_node: OpenFirmware node to parse for device tree bindings (may be 2729 * NULL). 2730 * 2731 * Called by regulator drivers to register a regulator. 2732 * Returns 0 on success. 2733 */ 2734struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2735 struct device *dev, const struct regulator_init_data *init_data, 2736 void *driver_data, struct device_node *of_node) 2737{ 2738 const struct regulation_constraints *constraints = NULL; 2739 static atomic_t regulator_no = ATOMIC_INIT(0); 2740 struct regulator_dev *rdev; 2741 int ret, i; 2742 const char *supply = NULL; 2743 2744 if (regulator_desc == NULL) 2745 return ERR_PTR(-EINVAL); 2746 2747 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2748 return ERR_PTR(-EINVAL); 2749 2750 if (regulator_desc->type != REGULATOR_VOLTAGE && 2751 regulator_desc->type != REGULATOR_CURRENT) 2752 return ERR_PTR(-EINVAL); 2753 2754 /* Only one of each should be implemented */ 2755 WARN_ON(regulator_desc->ops->get_voltage && 2756 regulator_desc->ops->get_voltage_sel); 2757 WARN_ON(regulator_desc->ops->set_voltage && 2758 regulator_desc->ops->set_voltage_sel); 2759 2760 /* If we're using selectors we must implement list_voltage. */ 2761 if (regulator_desc->ops->get_voltage_sel && 2762 !regulator_desc->ops->list_voltage) { 2763 return ERR_PTR(-EINVAL); 2764 } 2765 if (regulator_desc->ops->set_voltage_sel && 2766 !regulator_desc->ops->list_voltage) { 2767 return ERR_PTR(-EINVAL); 2768 } 2769 2770 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2771 if (rdev == NULL) 2772 return ERR_PTR(-ENOMEM); 2773 2774 mutex_lock(®ulator_list_mutex); 2775 2776 mutex_init(&rdev->mutex); 2777 rdev->reg_data = driver_data; 2778 rdev->owner = regulator_desc->owner; 2779 rdev->desc = regulator_desc; 2780 INIT_LIST_HEAD(&rdev->consumer_list); 2781 INIT_LIST_HEAD(&rdev->list); 2782 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2783 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2784 2785 /* preform any regulator specific init */ 2786 if (init_data && init_data->regulator_init) { 2787 ret = init_data->regulator_init(rdev->reg_data); 2788 if (ret < 0) 2789 goto clean; 2790 } 2791 2792 /* register with sysfs */ 2793 rdev->dev.class = ®ulator_class; 2794 rdev->dev.of_node = of_node; 2795 rdev->dev.parent = dev; 2796 dev_set_name(&rdev->dev, "regulator.%d", 2797 atomic_inc_return(®ulator_no) - 1); 2798 ret = device_register(&rdev->dev); 2799 if (ret != 0) { 2800 put_device(&rdev->dev); 2801 goto clean; 2802 } 2803 2804 dev_set_drvdata(&rdev->dev, rdev); 2805 2806 /* set regulator constraints */ 2807 if (init_data) 2808 constraints = &init_data->constraints; 2809 2810 ret = set_machine_constraints(rdev, constraints); 2811 if (ret < 0) 2812 goto scrub; 2813 2814 /* add attributes supported by this regulator */ 2815 ret = add_regulator_attributes(rdev); 2816 if (ret < 0) 2817 goto scrub; 2818 2819 if (init_data && init_data->supply_regulator) 2820 supply = init_data->supply_regulator; 2821 else if (regulator_desc->supply_name) 2822 supply = regulator_desc->supply_name; 2823 2824 if (supply) { 2825 struct regulator_dev *r; 2826 2827 r = regulator_dev_lookup(dev, supply); 2828 2829 if (!r) { 2830 dev_err(dev, "Failed to find supply %s\n", supply); 2831 ret = -ENODEV; 2832 goto scrub; 2833 } 2834 2835 ret = set_supply(rdev, r); 2836 if (ret < 0) 2837 goto scrub; 2838 2839 /* Enable supply if rail is enabled */ 2840 if (rdev->desc->ops->is_enabled && 2841 rdev->desc->ops->is_enabled(rdev)) { 2842 ret = regulator_enable(rdev->supply); 2843 if (ret < 0) 2844 goto scrub; 2845 } 2846 } 2847 2848 /* add consumers devices */ 2849 if (init_data) { 2850 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2851 ret = set_consumer_device_supply(rdev, 2852 init_data->consumer_supplies[i].dev_name, 2853 init_data->consumer_supplies[i].supply); 2854 if (ret < 0) { 2855 dev_err(dev, "Failed to set supply %s\n", 2856 init_data->consumer_supplies[i].supply); 2857 goto unset_supplies; 2858 } 2859 } 2860 } 2861 2862 list_add(&rdev->list, ®ulator_list); 2863 2864 rdev_init_debugfs(rdev); 2865out: 2866 mutex_unlock(®ulator_list_mutex); 2867 return rdev; 2868 2869unset_supplies: 2870 unset_regulator_supplies(rdev); 2871 2872scrub: 2873 kfree(rdev->constraints); 2874 device_unregister(&rdev->dev); 2875 /* device core frees rdev */ 2876 rdev = ERR_PTR(ret); 2877 goto out; 2878 2879clean: 2880 kfree(rdev); 2881 rdev = ERR_PTR(ret); 2882 goto out; 2883} 2884EXPORT_SYMBOL_GPL(regulator_register); 2885 2886/** 2887 * regulator_unregister - unregister regulator 2888 * @rdev: regulator to unregister 2889 * 2890 * Called by regulator drivers to unregister a regulator. 2891 */ 2892void regulator_unregister(struct regulator_dev *rdev) 2893{ 2894 if (rdev == NULL) 2895 return; 2896 2897 mutex_lock(®ulator_list_mutex); 2898#ifdef CONFIG_DEBUG_FS 2899 debugfs_remove_recursive(rdev->debugfs); 2900#endif 2901 flush_work_sync(&rdev->disable_work.work); 2902 WARN_ON(rdev->open_count); 2903 unset_regulator_supplies(rdev); 2904 list_del(&rdev->list); 2905 if (rdev->supply) 2906 regulator_put(rdev->supply); 2907 kfree(rdev->constraints); 2908 device_unregister(&rdev->dev); 2909 mutex_unlock(®ulator_list_mutex); 2910} 2911EXPORT_SYMBOL_GPL(regulator_unregister); 2912 2913/** 2914 * regulator_suspend_prepare - prepare regulators for system wide suspend 2915 * @state: system suspend state 2916 * 2917 * Configure each regulator with it's suspend operating parameters for state. 2918 * This will usually be called by machine suspend code prior to supending. 2919 */ 2920int regulator_suspend_prepare(suspend_state_t state) 2921{ 2922 struct regulator_dev *rdev; 2923 int ret = 0; 2924 2925 /* ON is handled by regulator active state */ 2926 if (state == PM_SUSPEND_ON) 2927 return -EINVAL; 2928 2929 mutex_lock(®ulator_list_mutex); 2930 list_for_each_entry(rdev, ®ulator_list, list) { 2931 2932 mutex_lock(&rdev->mutex); 2933 ret = suspend_prepare(rdev, state); 2934 mutex_unlock(&rdev->mutex); 2935 2936 if (ret < 0) { 2937 rdev_err(rdev, "failed to prepare\n"); 2938 goto out; 2939 } 2940 } 2941out: 2942 mutex_unlock(®ulator_list_mutex); 2943 return ret; 2944} 2945EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2946 2947/** 2948 * regulator_suspend_finish - resume regulators from system wide suspend 2949 * 2950 * Turn on regulators that might be turned off by regulator_suspend_prepare 2951 * and that should be turned on according to the regulators properties. 2952 */ 2953int regulator_suspend_finish(void) 2954{ 2955 struct regulator_dev *rdev; 2956 int ret = 0, error; 2957 2958 mutex_lock(®ulator_list_mutex); 2959 list_for_each_entry(rdev, ®ulator_list, list) { 2960 struct regulator_ops *ops = rdev->desc->ops; 2961 2962 mutex_lock(&rdev->mutex); 2963 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 2964 ops->enable) { 2965 error = ops->enable(rdev); 2966 if (error) 2967 ret = error; 2968 } else { 2969 if (!has_full_constraints) 2970 goto unlock; 2971 if (!ops->disable) 2972 goto unlock; 2973 if (ops->is_enabled && !ops->is_enabled(rdev)) 2974 goto unlock; 2975 2976 error = ops->disable(rdev); 2977 if (error) 2978 ret = error; 2979 } 2980unlock: 2981 mutex_unlock(&rdev->mutex); 2982 } 2983 mutex_unlock(®ulator_list_mutex); 2984 return ret; 2985} 2986EXPORT_SYMBOL_GPL(regulator_suspend_finish); 2987 2988/** 2989 * regulator_has_full_constraints - the system has fully specified constraints 2990 * 2991 * Calling this function will cause the regulator API to disable all 2992 * regulators which have a zero use count and don't have an always_on 2993 * constraint in a late_initcall. 2994 * 2995 * The intention is that this will become the default behaviour in a 2996 * future kernel release so users are encouraged to use this facility 2997 * now. 2998 */ 2999void regulator_has_full_constraints(void) 3000{ 3001 has_full_constraints = 1; 3002} 3003EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3004 3005/** 3006 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3007 * 3008 * Calling this function will cause the regulator API to provide a 3009 * dummy regulator to consumers if no physical regulator is found, 3010 * allowing most consumers to proceed as though a regulator were 3011 * configured. This allows systems such as those with software 3012 * controllable regulators for the CPU core only to be brought up more 3013 * readily. 3014 */ 3015void regulator_use_dummy_regulator(void) 3016{ 3017 board_wants_dummy_regulator = true; 3018} 3019EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3020 3021/** 3022 * rdev_get_drvdata - get rdev regulator driver data 3023 * @rdev: regulator 3024 * 3025 * Get rdev regulator driver private data. This call can be used in the 3026 * regulator driver context. 3027 */ 3028void *rdev_get_drvdata(struct regulator_dev *rdev) 3029{ 3030 return rdev->reg_data; 3031} 3032EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3033 3034/** 3035 * regulator_get_drvdata - get regulator driver data 3036 * @regulator: regulator 3037 * 3038 * Get regulator driver private data. This call can be used in the consumer 3039 * driver context when non API regulator specific functions need to be called. 3040 */ 3041void *regulator_get_drvdata(struct regulator *regulator) 3042{ 3043 return regulator->rdev->reg_data; 3044} 3045EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3046 3047/** 3048 * regulator_set_drvdata - set regulator driver data 3049 * @regulator: regulator 3050 * @data: data 3051 */ 3052void regulator_set_drvdata(struct regulator *regulator, void *data) 3053{ 3054 regulator->rdev->reg_data = data; 3055} 3056EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3057 3058/** 3059 * regulator_get_id - get regulator ID 3060 * @rdev: regulator 3061 */ 3062int rdev_get_id(struct regulator_dev *rdev) 3063{ 3064 return rdev->desc->id; 3065} 3066EXPORT_SYMBOL_GPL(rdev_get_id); 3067 3068struct device *rdev_get_dev(struct regulator_dev *rdev) 3069{ 3070 return &rdev->dev; 3071} 3072EXPORT_SYMBOL_GPL(rdev_get_dev); 3073 3074void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3075{ 3076 return reg_init_data->driver_data; 3077} 3078EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3079 3080#ifdef CONFIG_DEBUG_FS 3081static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3082 size_t count, loff_t *ppos) 3083{ 3084 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3085 ssize_t len, ret = 0; 3086 struct regulator_map *map; 3087 3088 if (!buf) 3089 return -ENOMEM; 3090 3091 list_for_each_entry(map, ®ulator_map_list, list) { 3092 len = snprintf(buf + ret, PAGE_SIZE - ret, 3093 "%s -> %s.%s\n", 3094 rdev_get_name(map->regulator), map->dev_name, 3095 map->supply); 3096 if (len >= 0) 3097 ret += len; 3098 if (ret > PAGE_SIZE) { 3099 ret = PAGE_SIZE; 3100 break; 3101 } 3102 } 3103 3104 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3105 3106 kfree(buf); 3107 3108 return ret; 3109} 3110 3111static const struct file_operations supply_map_fops = { 3112 .read = supply_map_read_file, 3113 .llseek = default_llseek, 3114}; 3115#endif 3116 3117static int __init regulator_init(void) 3118{ 3119 int ret; 3120 3121 ret = class_register(®ulator_class); 3122 3123#ifdef CONFIG_DEBUG_FS 3124 debugfs_root = debugfs_create_dir("regulator", NULL); 3125 if (IS_ERR(debugfs_root) || !debugfs_root) { 3126 pr_warn("regulator: Failed to create debugfs directory\n"); 3127 debugfs_root = NULL; 3128 } 3129 3130 if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3131 NULL, &supply_map_fops))) 3132 pr_warn("regulator: Failed to create supplies debugfs\n"); 3133#endif 3134 3135 regulator_dummy_init(); 3136 3137 return ret; 3138} 3139 3140/* init early to allow our consumers to complete system booting */ 3141core_initcall(regulator_init); 3142 3143static int __init regulator_init_complete(void) 3144{ 3145 struct regulator_dev *rdev; 3146 struct regulator_ops *ops; 3147 struct regulation_constraints *c; 3148 int enabled, ret; 3149 3150 mutex_lock(®ulator_list_mutex); 3151 3152 /* If we have a full configuration then disable any regulators 3153 * which are not in use or always_on. This will become the 3154 * default behaviour in the future. 3155 */ 3156 list_for_each_entry(rdev, ®ulator_list, list) { 3157 ops = rdev->desc->ops; 3158 c = rdev->constraints; 3159 3160 if (!ops->disable || (c && c->always_on)) 3161 continue; 3162 3163 mutex_lock(&rdev->mutex); 3164 3165 if (rdev->use_count) 3166 goto unlock; 3167 3168 /* If we can't read the status assume it's on. */ 3169 if (ops->is_enabled) 3170 enabled = ops->is_enabled(rdev); 3171 else 3172 enabled = 1; 3173 3174 if (!enabled) 3175 goto unlock; 3176 3177 if (has_full_constraints) { 3178 /* We log since this may kill the system if it 3179 * goes wrong. */ 3180 rdev_info(rdev, "disabling\n"); 3181 ret = ops->disable(rdev); 3182 if (ret != 0) { 3183 rdev_err(rdev, "couldn't disable: %d\n", ret); 3184 } 3185 } else { 3186 /* The intention is that in future we will 3187 * assume that full constraints are provided 3188 * so warn even if we aren't going to do 3189 * anything here. 3190 */ 3191 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3192 } 3193 3194unlock: 3195 mutex_unlock(&rdev->mutex); 3196 } 3197 3198 mutex_unlock(®ulator_list_mutex); 3199 3200 return 0; 3201} 3202late_initcall(regulator_init_complete); 3203