core.c revision e8eef82b2c652d031bee9dff9762325672f5a1e0
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/device.h> 21#include <linux/slab.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/regulator/consumer.h> 27#include <linux/regulator/driver.h> 28#include <linux/regulator/machine.h> 29 30#define CREATE_TRACE_POINTS 31#include <trace/events/regulator.h> 32 33#include "dummy.h" 34 35#define rdev_err(rdev, fmt, ...) \ 36 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 37#define rdev_warn(rdev, fmt, ...) \ 38 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 39#define rdev_info(rdev, fmt, ...) \ 40 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_dbg(rdev, fmt, ...) \ 42 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43 44static DEFINE_MUTEX(regulator_list_mutex); 45static LIST_HEAD(regulator_list); 46static LIST_HEAD(regulator_map_list); 47static int has_full_constraints; 48static bool board_wants_dummy_regulator; 49 50/* 51 * struct regulator_map 52 * 53 * Used to provide symbolic supply names to devices. 54 */ 55struct regulator_map { 56 struct list_head list; 57 const char *dev_name; /* The dev_name() for the consumer */ 58 const char *supply; 59 struct regulator_dev *regulator; 60}; 61 62/* 63 * struct regulator 64 * 65 * One for each consumer device. 66 */ 67struct regulator { 68 struct device *dev; 69 struct list_head list; 70 int uA_load; 71 int min_uV; 72 int max_uV; 73 char *supply_name; 74 struct device_attribute dev_attr; 75 struct regulator_dev *rdev; 76}; 77 78static int _regulator_is_enabled(struct regulator_dev *rdev); 79static int _regulator_disable(struct regulator_dev *rdev, 80 struct regulator_dev **supply_rdev_ptr); 81static int _regulator_get_voltage(struct regulator_dev *rdev); 82static int _regulator_get_current_limit(struct regulator_dev *rdev); 83static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 84static void _notifier_call_chain(struct regulator_dev *rdev, 85 unsigned long event, void *data); 86static int _regulator_do_set_voltage(struct regulator_dev *rdev, 87 int min_uV, int max_uV); 88 89static const char *rdev_get_name(struct regulator_dev *rdev) 90{ 91 if (rdev->constraints && rdev->constraints->name) 92 return rdev->constraints->name; 93 else if (rdev->desc->name) 94 return rdev->desc->name; 95 else 96 return ""; 97} 98 99/* gets the regulator for a given consumer device */ 100static struct regulator *get_device_regulator(struct device *dev) 101{ 102 struct regulator *regulator = NULL; 103 struct regulator_dev *rdev; 104 105 mutex_lock(®ulator_list_mutex); 106 list_for_each_entry(rdev, ®ulator_list, list) { 107 mutex_lock(&rdev->mutex); 108 list_for_each_entry(regulator, &rdev->consumer_list, list) { 109 if (regulator->dev == dev) { 110 mutex_unlock(&rdev->mutex); 111 mutex_unlock(®ulator_list_mutex); 112 return regulator; 113 } 114 } 115 mutex_unlock(&rdev->mutex); 116 } 117 mutex_unlock(®ulator_list_mutex); 118 return NULL; 119} 120 121/* Platform voltage constraint check */ 122static int regulator_check_voltage(struct regulator_dev *rdev, 123 int *min_uV, int *max_uV) 124{ 125 BUG_ON(*min_uV > *max_uV); 126 127 if (!rdev->constraints) { 128 rdev_err(rdev, "no constraints\n"); 129 return -ENODEV; 130 } 131 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 132 rdev_err(rdev, "operation not allowed\n"); 133 return -EPERM; 134 } 135 136 if (*max_uV > rdev->constraints->max_uV) 137 *max_uV = rdev->constraints->max_uV; 138 if (*min_uV < rdev->constraints->min_uV) 139 *min_uV = rdev->constraints->min_uV; 140 141 if (*min_uV > *max_uV) 142 return -EINVAL; 143 144 return 0; 145} 146 147/* Make sure we select a voltage that suits the needs of all 148 * regulator consumers 149 */ 150static int regulator_check_consumers(struct regulator_dev *rdev, 151 int *min_uV, int *max_uV) 152{ 153 struct regulator *regulator; 154 155 list_for_each_entry(regulator, &rdev->consumer_list, list) { 156 if (*max_uV > regulator->max_uV) 157 *max_uV = regulator->max_uV; 158 if (*min_uV < regulator->min_uV) 159 *min_uV = regulator->min_uV; 160 } 161 162 if (*min_uV > *max_uV) 163 return -EINVAL; 164 165 return 0; 166} 167 168/* current constraint check */ 169static int regulator_check_current_limit(struct regulator_dev *rdev, 170 int *min_uA, int *max_uA) 171{ 172 BUG_ON(*min_uA > *max_uA); 173 174 if (!rdev->constraints) { 175 rdev_err(rdev, "no constraints\n"); 176 return -ENODEV; 177 } 178 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 179 rdev_err(rdev, "operation not allowed\n"); 180 return -EPERM; 181 } 182 183 if (*max_uA > rdev->constraints->max_uA) 184 *max_uA = rdev->constraints->max_uA; 185 if (*min_uA < rdev->constraints->min_uA) 186 *min_uA = rdev->constraints->min_uA; 187 188 if (*min_uA > *max_uA) 189 return -EINVAL; 190 191 return 0; 192} 193 194/* operating mode constraint check */ 195static int regulator_check_mode(struct regulator_dev *rdev, int mode) 196{ 197 switch (mode) { 198 case REGULATOR_MODE_FAST: 199 case REGULATOR_MODE_NORMAL: 200 case REGULATOR_MODE_IDLE: 201 case REGULATOR_MODE_STANDBY: 202 break; 203 default: 204 return -EINVAL; 205 } 206 207 if (!rdev->constraints) { 208 rdev_err(rdev, "no constraints\n"); 209 return -ENODEV; 210 } 211 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 212 rdev_err(rdev, "operation not allowed\n"); 213 return -EPERM; 214 } 215 if (!(rdev->constraints->valid_modes_mask & mode)) { 216 rdev_err(rdev, "invalid mode %x\n", mode); 217 return -EINVAL; 218 } 219 return 0; 220} 221 222/* dynamic regulator mode switching constraint check */ 223static int regulator_check_drms(struct regulator_dev *rdev) 224{ 225 if (!rdev->constraints) { 226 rdev_err(rdev, "no constraints\n"); 227 return -ENODEV; 228 } 229 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 230 rdev_err(rdev, "operation not allowed\n"); 231 return -EPERM; 232 } 233 return 0; 234} 235 236static ssize_t device_requested_uA_show(struct device *dev, 237 struct device_attribute *attr, char *buf) 238{ 239 struct regulator *regulator; 240 241 regulator = get_device_regulator(dev); 242 if (regulator == NULL) 243 return 0; 244 245 return sprintf(buf, "%d\n", regulator->uA_load); 246} 247 248static ssize_t regulator_uV_show(struct device *dev, 249 struct device_attribute *attr, char *buf) 250{ 251 struct regulator_dev *rdev = dev_get_drvdata(dev); 252 ssize_t ret; 253 254 mutex_lock(&rdev->mutex); 255 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 256 mutex_unlock(&rdev->mutex); 257 258 return ret; 259} 260static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 261 262static ssize_t regulator_uA_show(struct device *dev, 263 struct device_attribute *attr, char *buf) 264{ 265 struct regulator_dev *rdev = dev_get_drvdata(dev); 266 267 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 268} 269static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 270 271static ssize_t regulator_name_show(struct device *dev, 272 struct device_attribute *attr, char *buf) 273{ 274 struct regulator_dev *rdev = dev_get_drvdata(dev); 275 276 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 277} 278 279static ssize_t regulator_print_opmode(char *buf, int mode) 280{ 281 switch (mode) { 282 case REGULATOR_MODE_FAST: 283 return sprintf(buf, "fast\n"); 284 case REGULATOR_MODE_NORMAL: 285 return sprintf(buf, "normal\n"); 286 case REGULATOR_MODE_IDLE: 287 return sprintf(buf, "idle\n"); 288 case REGULATOR_MODE_STANDBY: 289 return sprintf(buf, "standby\n"); 290 } 291 return sprintf(buf, "unknown\n"); 292} 293 294static ssize_t regulator_opmode_show(struct device *dev, 295 struct device_attribute *attr, char *buf) 296{ 297 struct regulator_dev *rdev = dev_get_drvdata(dev); 298 299 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 300} 301static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 302 303static ssize_t regulator_print_state(char *buf, int state) 304{ 305 if (state > 0) 306 return sprintf(buf, "enabled\n"); 307 else if (state == 0) 308 return sprintf(buf, "disabled\n"); 309 else 310 return sprintf(buf, "unknown\n"); 311} 312 313static ssize_t regulator_state_show(struct device *dev, 314 struct device_attribute *attr, char *buf) 315{ 316 struct regulator_dev *rdev = dev_get_drvdata(dev); 317 ssize_t ret; 318 319 mutex_lock(&rdev->mutex); 320 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 321 mutex_unlock(&rdev->mutex); 322 323 return ret; 324} 325static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 326 327static ssize_t regulator_status_show(struct device *dev, 328 struct device_attribute *attr, char *buf) 329{ 330 struct regulator_dev *rdev = dev_get_drvdata(dev); 331 int status; 332 char *label; 333 334 status = rdev->desc->ops->get_status(rdev); 335 if (status < 0) 336 return status; 337 338 switch (status) { 339 case REGULATOR_STATUS_OFF: 340 label = "off"; 341 break; 342 case REGULATOR_STATUS_ON: 343 label = "on"; 344 break; 345 case REGULATOR_STATUS_ERROR: 346 label = "error"; 347 break; 348 case REGULATOR_STATUS_FAST: 349 label = "fast"; 350 break; 351 case REGULATOR_STATUS_NORMAL: 352 label = "normal"; 353 break; 354 case REGULATOR_STATUS_IDLE: 355 label = "idle"; 356 break; 357 case REGULATOR_STATUS_STANDBY: 358 label = "standby"; 359 break; 360 default: 361 return -ERANGE; 362 } 363 364 return sprintf(buf, "%s\n", label); 365} 366static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 367 368static ssize_t regulator_min_uA_show(struct device *dev, 369 struct device_attribute *attr, char *buf) 370{ 371 struct regulator_dev *rdev = dev_get_drvdata(dev); 372 373 if (!rdev->constraints) 374 return sprintf(buf, "constraint not defined\n"); 375 376 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 377} 378static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 379 380static ssize_t regulator_max_uA_show(struct device *dev, 381 struct device_attribute *attr, char *buf) 382{ 383 struct regulator_dev *rdev = dev_get_drvdata(dev); 384 385 if (!rdev->constraints) 386 return sprintf(buf, "constraint not defined\n"); 387 388 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 389} 390static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 391 392static ssize_t regulator_min_uV_show(struct device *dev, 393 struct device_attribute *attr, char *buf) 394{ 395 struct regulator_dev *rdev = dev_get_drvdata(dev); 396 397 if (!rdev->constraints) 398 return sprintf(buf, "constraint not defined\n"); 399 400 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 401} 402static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 403 404static ssize_t regulator_max_uV_show(struct device *dev, 405 struct device_attribute *attr, char *buf) 406{ 407 struct regulator_dev *rdev = dev_get_drvdata(dev); 408 409 if (!rdev->constraints) 410 return sprintf(buf, "constraint not defined\n"); 411 412 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 413} 414static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 415 416static ssize_t regulator_total_uA_show(struct device *dev, 417 struct device_attribute *attr, char *buf) 418{ 419 struct regulator_dev *rdev = dev_get_drvdata(dev); 420 struct regulator *regulator; 421 int uA = 0; 422 423 mutex_lock(&rdev->mutex); 424 list_for_each_entry(regulator, &rdev->consumer_list, list) 425 uA += regulator->uA_load; 426 mutex_unlock(&rdev->mutex); 427 return sprintf(buf, "%d\n", uA); 428} 429static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 430 431static ssize_t regulator_num_users_show(struct device *dev, 432 struct device_attribute *attr, char *buf) 433{ 434 struct regulator_dev *rdev = dev_get_drvdata(dev); 435 return sprintf(buf, "%d\n", rdev->use_count); 436} 437 438static ssize_t regulator_type_show(struct device *dev, 439 struct device_attribute *attr, char *buf) 440{ 441 struct regulator_dev *rdev = dev_get_drvdata(dev); 442 443 switch (rdev->desc->type) { 444 case REGULATOR_VOLTAGE: 445 return sprintf(buf, "voltage\n"); 446 case REGULATOR_CURRENT: 447 return sprintf(buf, "current\n"); 448 } 449 return sprintf(buf, "unknown\n"); 450} 451 452static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 453 struct device_attribute *attr, char *buf) 454{ 455 struct regulator_dev *rdev = dev_get_drvdata(dev); 456 457 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 458} 459static DEVICE_ATTR(suspend_mem_microvolts, 0444, 460 regulator_suspend_mem_uV_show, NULL); 461 462static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 463 struct device_attribute *attr, char *buf) 464{ 465 struct regulator_dev *rdev = dev_get_drvdata(dev); 466 467 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 468} 469static DEVICE_ATTR(suspend_disk_microvolts, 0444, 470 regulator_suspend_disk_uV_show, NULL); 471 472static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 473 struct device_attribute *attr, char *buf) 474{ 475 struct regulator_dev *rdev = dev_get_drvdata(dev); 476 477 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 478} 479static DEVICE_ATTR(suspend_standby_microvolts, 0444, 480 regulator_suspend_standby_uV_show, NULL); 481 482static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 483 struct device_attribute *attr, char *buf) 484{ 485 struct regulator_dev *rdev = dev_get_drvdata(dev); 486 487 return regulator_print_opmode(buf, 488 rdev->constraints->state_mem.mode); 489} 490static DEVICE_ATTR(suspend_mem_mode, 0444, 491 regulator_suspend_mem_mode_show, NULL); 492 493static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 494 struct device_attribute *attr, char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 498 return regulator_print_opmode(buf, 499 rdev->constraints->state_disk.mode); 500} 501static DEVICE_ATTR(suspend_disk_mode, 0444, 502 regulator_suspend_disk_mode_show, NULL); 503 504static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 505 struct device_attribute *attr, char *buf) 506{ 507 struct regulator_dev *rdev = dev_get_drvdata(dev); 508 509 return regulator_print_opmode(buf, 510 rdev->constraints->state_standby.mode); 511} 512static DEVICE_ATTR(suspend_standby_mode, 0444, 513 regulator_suspend_standby_mode_show, NULL); 514 515static ssize_t regulator_suspend_mem_state_show(struct device *dev, 516 struct device_attribute *attr, char *buf) 517{ 518 struct regulator_dev *rdev = dev_get_drvdata(dev); 519 520 return regulator_print_state(buf, 521 rdev->constraints->state_mem.enabled); 522} 523static DEVICE_ATTR(suspend_mem_state, 0444, 524 regulator_suspend_mem_state_show, NULL); 525 526static ssize_t regulator_suspend_disk_state_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return regulator_print_state(buf, 532 rdev->constraints->state_disk.enabled); 533} 534static DEVICE_ATTR(suspend_disk_state, 0444, 535 regulator_suspend_disk_state_show, NULL); 536 537static ssize_t regulator_suspend_standby_state_show(struct device *dev, 538 struct device_attribute *attr, char *buf) 539{ 540 struct regulator_dev *rdev = dev_get_drvdata(dev); 541 542 return regulator_print_state(buf, 543 rdev->constraints->state_standby.enabled); 544} 545static DEVICE_ATTR(suspend_standby_state, 0444, 546 regulator_suspend_standby_state_show, NULL); 547 548 549/* 550 * These are the only attributes are present for all regulators. 551 * Other attributes are a function of regulator functionality. 552 */ 553static struct device_attribute regulator_dev_attrs[] = { 554 __ATTR(name, 0444, regulator_name_show, NULL), 555 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 556 __ATTR(type, 0444, regulator_type_show, NULL), 557 __ATTR_NULL, 558}; 559 560static void regulator_dev_release(struct device *dev) 561{ 562 struct regulator_dev *rdev = dev_get_drvdata(dev); 563 kfree(rdev); 564} 565 566static struct class regulator_class = { 567 .name = "regulator", 568 .dev_release = regulator_dev_release, 569 .dev_attrs = regulator_dev_attrs, 570}; 571 572/* Calculate the new optimum regulator operating mode based on the new total 573 * consumer load. All locks held by caller */ 574static void drms_uA_update(struct regulator_dev *rdev) 575{ 576 struct regulator *sibling; 577 int current_uA = 0, output_uV, input_uV, err; 578 unsigned int mode; 579 580 err = regulator_check_drms(rdev); 581 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 582 (!rdev->desc->ops->get_voltage && 583 !rdev->desc->ops->get_voltage_sel) || 584 !rdev->desc->ops->set_mode) 585 return; 586 587 /* get output voltage */ 588 output_uV = _regulator_get_voltage(rdev); 589 if (output_uV <= 0) 590 return; 591 592 /* get input voltage */ 593 input_uV = 0; 594 if (rdev->supply) 595 input_uV = _regulator_get_voltage(rdev); 596 if (input_uV <= 0) 597 input_uV = rdev->constraints->input_uV; 598 if (input_uV <= 0) 599 return; 600 601 /* calc total requested load */ 602 list_for_each_entry(sibling, &rdev->consumer_list, list) 603 current_uA += sibling->uA_load; 604 605 /* now get the optimum mode for our new total regulator load */ 606 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 607 output_uV, current_uA); 608 609 /* check the new mode is allowed */ 610 err = regulator_check_mode(rdev, mode); 611 if (err == 0) 612 rdev->desc->ops->set_mode(rdev, mode); 613} 614 615static int suspend_set_state(struct regulator_dev *rdev, 616 struct regulator_state *rstate) 617{ 618 int ret = 0; 619 bool can_set_state; 620 621 can_set_state = rdev->desc->ops->set_suspend_enable && 622 rdev->desc->ops->set_suspend_disable; 623 624 /* If we have no suspend mode configration don't set anything; 625 * only warn if the driver actually makes the suspend mode 626 * configurable. 627 */ 628 if (!rstate->enabled && !rstate->disabled) { 629 if (can_set_state) 630 rdev_warn(rdev, "No configuration\n"); 631 return 0; 632 } 633 634 if (rstate->enabled && rstate->disabled) { 635 rdev_err(rdev, "invalid configuration\n"); 636 return -EINVAL; 637 } 638 639 if (!can_set_state) { 640 rdev_err(rdev, "no way to set suspend state\n"); 641 return -EINVAL; 642 } 643 644 if (rstate->enabled) 645 ret = rdev->desc->ops->set_suspend_enable(rdev); 646 else 647 ret = rdev->desc->ops->set_suspend_disable(rdev); 648 if (ret < 0) { 649 rdev_err(rdev, "failed to enabled/disable\n"); 650 return ret; 651 } 652 653 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 654 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 655 if (ret < 0) { 656 rdev_err(rdev, "failed to set voltage\n"); 657 return ret; 658 } 659 } 660 661 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 662 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 663 if (ret < 0) { 664 rdev_err(rdev, "failed to set mode\n"); 665 return ret; 666 } 667 } 668 return ret; 669} 670 671/* locks held by caller */ 672static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 673{ 674 if (!rdev->constraints) 675 return -EINVAL; 676 677 switch (state) { 678 case PM_SUSPEND_STANDBY: 679 return suspend_set_state(rdev, 680 &rdev->constraints->state_standby); 681 case PM_SUSPEND_MEM: 682 return suspend_set_state(rdev, 683 &rdev->constraints->state_mem); 684 case PM_SUSPEND_MAX: 685 return suspend_set_state(rdev, 686 &rdev->constraints->state_disk); 687 default: 688 return -EINVAL; 689 } 690} 691 692static void print_constraints(struct regulator_dev *rdev) 693{ 694 struct regulation_constraints *constraints = rdev->constraints; 695 char buf[80] = ""; 696 int count = 0; 697 int ret; 698 699 if (constraints->min_uV && constraints->max_uV) { 700 if (constraints->min_uV == constraints->max_uV) 701 count += sprintf(buf + count, "%d mV ", 702 constraints->min_uV / 1000); 703 else 704 count += sprintf(buf + count, "%d <--> %d mV ", 705 constraints->min_uV / 1000, 706 constraints->max_uV / 1000); 707 } 708 709 if (!constraints->min_uV || 710 constraints->min_uV != constraints->max_uV) { 711 ret = _regulator_get_voltage(rdev); 712 if (ret > 0) 713 count += sprintf(buf + count, "at %d mV ", ret / 1000); 714 } 715 716 if (constraints->min_uA && constraints->max_uA) { 717 if (constraints->min_uA == constraints->max_uA) 718 count += sprintf(buf + count, "%d mA ", 719 constraints->min_uA / 1000); 720 else 721 count += sprintf(buf + count, "%d <--> %d mA ", 722 constraints->min_uA / 1000, 723 constraints->max_uA / 1000); 724 } 725 726 if (!constraints->min_uA || 727 constraints->min_uA != constraints->max_uA) { 728 ret = _regulator_get_current_limit(rdev); 729 if (ret > 0) 730 count += sprintf(buf + count, "at %d mA ", ret / 1000); 731 } 732 733 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 734 count += sprintf(buf + count, "fast "); 735 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 736 count += sprintf(buf + count, "normal "); 737 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 738 count += sprintf(buf + count, "idle "); 739 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 740 count += sprintf(buf + count, "standby"); 741 742 rdev_info(rdev, "regulator: %s\n", buf); 743} 744 745static int machine_constraints_voltage(struct regulator_dev *rdev, 746 struct regulation_constraints *constraints) 747{ 748 struct regulator_ops *ops = rdev->desc->ops; 749 int ret; 750 751 /* do we need to apply the constraint voltage */ 752 if (rdev->constraints->apply_uV && 753 rdev->constraints->min_uV == rdev->constraints->max_uV) { 754 ret = _regulator_do_set_voltage(rdev, 755 rdev->constraints->min_uV, 756 rdev->constraints->max_uV); 757 if (ret < 0) { 758 rdev_err(rdev, "failed to apply %duV constraint\n", 759 rdev->constraints->min_uV); 760 rdev->constraints = NULL; 761 return ret; 762 } 763 } 764 765 /* constrain machine-level voltage specs to fit 766 * the actual range supported by this regulator. 767 */ 768 if (ops->list_voltage && rdev->desc->n_voltages) { 769 int count = rdev->desc->n_voltages; 770 int i; 771 int min_uV = INT_MAX; 772 int max_uV = INT_MIN; 773 int cmin = constraints->min_uV; 774 int cmax = constraints->max_uV; 775 776 /* it's safe to autoconfigure fixed-voltage supplies 777 and the constraints are used by list_voltage. */ 778 if (count == 1 && !cmin) { 779 cmin = 1; 780 cmax = INT_MAX; 781 constraints->min_uV = cmin; 782 constraints->max_uV = cmax; 783 } 784 785 /* voltage constraints are optional */ 786 if ((cmin == 0) && (cmax == 0)) 787 return 0; 788 789 /* else require explicit machine-level constraints */ 790 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 791 rdev_err(rdev, "invalid voltage constraints\n"); 792 return -EINVAL; 793 } 794 795 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 796 for (i = 0; i < count; i++) { 797 int value; 798 799 value = ops->list_voltage(rdev, i); 800 if (value <= 0) 801 continue; 802 803 /* maybe adjust [min_uV..max_uV] */ 804 if (value >= cmin && value < min_uV) 805 min_uV = value; 806 if (value <= cmax && value > max_uV) 807 max_uV = value; 808 } 809 810 /* final: [min_uV..max_uV] valid iff constraints valid */ 811 if (max_uV < min_uV) { 812 rdev_err(rdev, "unsupportable voltage constraints\n"); 813 return -EINVAL; 814 } 815 816 /* use regulator's subset of machine constraints */ 817 if (constraints->min_uV < min_uV) { 818 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 819 constraints->min_uV, min_uV); 820 constraints->min_uV = min_uV; 821 } 822 if (constraints->max_uV > max_uV) { 823 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 824 constraints->max_uV, max_uV); 825 constraints->max_uV = max_uV; 826 } 827 } 828 829 return 0; 830} 831 832/** 833 * set_machine_constraints - sets regulator constraints 834 * @rdev: regulator source 835 * @constraints: constraints to apply 836 * 837 * Allows platform initialisation code to define and constrain 838 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 839 * Constraints *must* be set by platform code in order for some 840 * regulator operations to proceed i.e. set_voltage, set_current_limit, 841 * set_mode. 842 */ 843static int set_machine_constraints(struct regulator_dev *rdev, 844 const struct regulation_constraints *constraints) 845{ 846 int ret = 0; 847 struct regulator_ops *ops = rdev->desc->ops; 848 849 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 850 GFP_KERNEL); 851 if (!rdev->constraints) 852 return -ENOMEM; 853 854 ret = machine_constraints_voltage(rdev, rdev->constraints); 855 if (ret != 0) 856 goto out; 857 858 /* do we need to setup our suspend state */ 859 if (constraints->initial_state) { 860 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 861 if (ret < 0) { 862 rdev_err(rdev, "failed to set suspend state\n"); 863 rdev->constraints = NULL; 864 goto out; 865 } 866 } 867 868 if (constraints->initial_mode) { 869 if (!ops->set_mode) { 870 rdev_err(rdev, "no set_mode operation\n"); 871 ret = -EINVAL; 872 goto out; 873 } 874 875 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 876 if (ret < 0) { 877 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 878 goto out; 879 } 880 } 881 882 /* If the constraints say the regulator should be on at this point 883 * and we have control then make sure it is enabled. 884 */ 885 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 886 ops->enable) { 887 ret = ops->enable(rdev); 888 if (ret < 0) { 889 rdev_err(rdev, "failed to enable\n"); 890 rdev->constraints = NULL; 891 goto out; 892 } 893 } 894 895 print_constraints(rdev); 896out: 897 return ret; 898} 899 900/** 901 * set_supply - set regulator supply regulator 902 * @rdev: regulator name 903 * @supply_rdev: supply regulator name 904 * 905 * Called by platform initialisation code to set the supply regulator for this 906 * regulator. This ensures that a regulators supply will also be enabled by the 907 * core if it's child is enabled. 908 */ 909static int set_supply(struct regulator_dev *rdev, 910 struct regulator_dev *supply_rdev) 911{ 912 int err; 913 914 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 915 "supply"); 916 if (err) { 917 rdev_err(rdev, "could not add device link %s err %d\n", 918 supply_rdev->dev.kobj.name, err); 919 goto out; 920 } 921 rdev->supply = supply_rdev; 922 list_add(&rdev->slist, &supply_rdev->supply_list); 923out: 924 return err; 925} 926 927/** 928 * set_consumer_device_supply - Bind a regulator to a symbolic supply 929 * @rdev: regulator source 930 * @consumer_dev: device the supply applies to 931 * @consumer_dev_name: dev_name() string for device supply applies to 932 * @supply: symbolic name for supply 933 * 934 * Allows platform initialisation code to map physical regulator 935 * sources to symbolic names for supplies for use by devices. Devices 936 * should use these symbolic names to request regulators, avoiding the 937 * need to provide board-specific regulator names as platform data. 938 * 939 * Only one of consumer_dev and consumer_dev_name may be specified. 940 */ 941static int set_consumer_device_supply(struct regulator_dev *rdev, 942 struct device *consumer_dev, const char *consumer_dev_name, 943 const char *supply) 944{ 945 struct regulator_map *node; 946 int has_dev; 947 948 if (consumer_dev && consumer_dev_name) 949 return -EINVAL; 950 951 if (!consumer_dev_name && consumer_dev) 952 consumer_dev_name = dev_name(consumer_dev); 953 954 if (supply == NULL) 955 return -EINVAL; 956 957 if (consumer_dev_name != NULL) 958 has_dev = 1; 959 else 960 has_dev = 0; 961 962 list_for_each_entry(node, ®ulator_map_list, list) { 963 if (node->dev_name && consumer_dev_name) { 964 if (strcmp(node->dev_name, consumer_dev_name) != 0) 965 continue; 966 } else if (node->dev_name || consumer_dev_name) { 967 continue; 968 } 969 970 if (strcmp(node->supply, supply) != 0) 971 continue; 972 973 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 974 dev_name(&node->regulator->dev), 975 node->regulator->desc->name, 976 supply, 977 dev_name(&rdev->dev), rdev_get_name(rdev)); 978 return -EBUSY; 979 } 980 981 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 982 if (node == NULL) 983 return -ENOMEM; 984 985 node->regulator = rdev; 986 node->supply = supply; 987 988 if (has_dev) { 989 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 990 if (node->dev_name == NULL) { 991 kfree(node); 992 return -ENOMEM; 993 } 994 } 995 996 list_add(&node->list, ®ulator_map_list); 997 return 0; 998} 999 1000static void unset_regulator_supplies(struct regulator_dev *rdev) 1001{ 1002 struct regulator_map *node, *n; 1003 1004 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1005 if (rdev == node->regulator) { 1006 list_del(&node->list); 1007 kfree(node->dev_name); 1008 kfree(node); 1009 } 1010 } 1011} 1012 1013#define REG_STR_SIZE 32 1014 1015static struct regulator *create_regulator(struct regulator_dev *rdev, 1016 struct device *dev, 1017 const char *supply_name) 1018{ 1019 struct regulator *regulator; 1020 char buf[REG_STR_SIZE]; 1021 int err, size; 1022 1023 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1024 if (regulator == NULL) 1025 return NULL; 1026 1027 mutex_lock(&rdev->mutex); 1028 regulator->rdev = rdev; 1029 list_add(®ulator->list, &rdev->consumer_list); 1030 1031 if (dev) { 1032 /* create a 'requested_microamps_name' sysfs entry */ 1033 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1034 supply_name); 1035 if (size >= REG_STR_SIZE) 1036 goto overflow_err; 1037 1038 regulator->dev = dev; 1039 sysfs_attr_init(®ulator->dev_attr.attr); 1040 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1041 if (regulator->dev_attr.attr.name == NULL) 1042 goto attr_name_err; 1043 1044 regulator->dev_attr.attr.mode = 0444; 1045 regulator->dev_attr.show = device_requested_uA_show; 1046 err = device_create_file(dev, ®ulator->dev_attr); 1047 if (err < 0) { 1048 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1049 goto attr_name_err; 1050 } 1051 1052 /* also add a link to the device sysfs entry */ 1053 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1054 dev->kobj.name, supply_name); 1055 if (size >= REG_STR_SIZE) 1056 goto attr_err; 1057 1058 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1059 if (regulator->supply_name == NULL) 1060 goto attr_err; 1061 1062 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1063 buf); 1064 if (err) { 1065 rdev_warn(rdev, "could not add device link %s err %d\n", 1066 dev->kobj.name, err); 1067 goto link_name_err; 1068 } 1069 } 1070 mutex_unlock(&rdev->mutex); 1071 return regulator; 1072link_name_err: 1073 kfree(regulator->supply_name); 1074attr_err: 1075 device_remove_file(regulator->dev, ®ulator->dev_attr); 1076attr_name_err: 1077 kfree(regulator->dev_attr.attr.name); 1078overflow_err: 1079 list_del(®ulator->list); 1080 kfree(regulator); 1081 mutex_unlock(&rdev->mutex); 1082 return NULL; 1083} 1084 1085static int _regulator_get_enable_time(struct regulator_dev *rdev) 1086{ 1087 if (!rdev->desc->ops->enable_time) 1088 return 0; 1089 return rdev->desc->ops->enable_time(rdev); 1090} 1091 1092/* Internal regulator request function */ 1093static struct regulator *_regulator_get(struct device *dev, const char *id, 1094 int exclusive) 1095{ 1096 struct regulator_dev *rdev; 1097 struct regulator_map *map; 1098 struct regulator *regulator = ERR_PTR(-ENODEV); 1099 const char *devname = NULL; 1100 int ret; 1101 1102 if (id == NULL) { 1103 pr_err("get() with no identifier\n"); 1104 return regulator; 1105 } 1106 1107 if (dev) 1108 devname = dev_name(dev); 1109 1110 mutex_lock(®ulator_list_mutex); 1111 1112 list_for_each_entry(map, ®ulator_map_list, list) { 1113 /* If the mapping has a device set up it must match */ 1114 if (map->dev_name && 1115 (!devname || strcmp(map->dev_name, devname))) 1116 continue; 1117 1118 if (strcmp(map->supply, id) == 0) { 1119 rdev = map->regulator; 1120 goto found; 1121 } 1122 } 1123 1124 if (board_wants_dummy_regulator) { 1125 rdev = dummy_regulator_rdev; 1126 goto found; 1127 } 1128 1129#ifdef CONFIG_REGULATOR_DUMMY 1130 if (!devname) 1131 devname = "deviceless"; 1132 1133 /* If the board didn't flag that it was fully constrained then 1134 * substitute in a dummy regulator so consumers can continue. 1135 */ 1136 if (!has_full_constraints) { 1137 pr_warn("%s supply %s not found, using dummy regulator\n", 1138 devname, id); 1139 rdev = dummy_regulator_rdev; 1140 goto found; 1141 } 1142#endif 1143 1144 mutex_unlock(®ulator_list_mutex); 1145 return regulator; 1146 1147found: 1148 if (rdev->exclusive) { 1149 regulator = ERR_PTR(-EPERM); 1150 goto out; 1151 } 1152 1153 if (exclusive && rdev->open_count) { 1154 regulator = ERR_PTR(-EBUSY); 1155 goto out; 1156 } 1157 1158 if (!try_module_get(rdev->owner)) 1159 goto out; 1160 1161 regulator = create_regulator(rdev, dev, id); 1162 if (regulator == NULL) { 1163 regulator = ERR_PTR(-ENOMEM); 1164 module_put(rdev->owner); 1165 } 1166 1167 rdev->open_count++; 1168 if (exclusive) { 1169 rdev->exclusive = 1; 1170 1171 ret = _regulator_is_enabled(rdev); 1172 if (ret > 0) 1173 rdev->use_count = 1; 1174 else 1175 rdev->use_count = 0; 1176 } 1177 1178out: 1179 mutex_unlock(®ulator_list_mutex); 1180 1181 return regulator; 1182} 1183 1184/** 1185 * regulator_get - lookup and obtain a reference to a regulator. 1186 * @dev: device for regulator "consumer" 1187 * @id: Supply name or regulator ID. 1188 * 1189 * Returns a struct regulator corresponding to the regulator producer, 1190 * or IS_ERR() condition containing errno. 1191 * 1192 * Use of supply names configured via regulator_set_device_supply() is 1193 * strongly encouraged. It is recommended that the supply name used 1194 * should match the name used for the supply and/or the relevant 1195 * device pins in the datasheet. 1196 */ 1197struct regulator *regulator_get(struct device *dev, const char *id) 1198{ 1199 return _regulator_get(dev, id, 0); 1200} 1201EXPORT_SYMBOL_GPL(regulator_get); 1202 1203/** 1204 * regulator_get_exclusive - obtain exclusive access to a regulator. 1205 * @dev: device for regulator "consumer" 1206 * @id: Supply name or regulator ID. 1207 * 1208 * Returns a struct regulator corresponding to the regulator producer, 1209 * or IS_ERR() condition containing errno. Other consumers will be 1210 * unable to obtain this reference is held and the use count for the 1211 * regulator will be initialised to reflect the current state of the 1212 * regulator. 1213 * 1214 * This is intended for use by consumers which cannot tolerate shared 1215 * use of the regulator such as those which need to force the 1216 * regulator off for correct operation of the hardware they are 1217 * controlling. 1218 * 1219 * Use of supply names configured via regulator_set_device_supply() is 1220 * strongly encouraged. It is recommended that the supply name used 1221 * should match the name used for the supply and/or the relevant 1222 * device pins in the datasheet. 1223 */ 1224struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1225{ 1226 return _regulator_get(dev, id, 1); 1227} 1228EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1229 1230/** 1231 * regulator_put - "free" the regulator source 1232 * @regulator: regulator source 1233 * 1234 * Note: drivers must ensure that all regulator_enable calls made on this 1235 * regulator source are balanced by regulator_disable calls prior to calling 1236 * this function. 1237 */ 1238void regulator_put(struct regulator *regulator) 1239{ 1240 struct regulator_dev *rdev; 1241 1242 if (regulator == NULL || IS_ERR(regulator)) 1243 return; 1244 1245 mutex_lock(®ulator_list_mutex); 1246 rdev = regulator->rdev; 1247 1248 /* remove any sysfs entries */ 1249 if (regulator->dev) { 1250 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1251 kfree(regulator->supply_name); 1252 device_remove_file(regulator->dev, ®ulator->dev_attr); 1253 kfree(regulator->dev_attr.attr.name); 1254 } 1255 list_del(®ulator->list); 1256 kfree(regulator); 1257 1258 rdev->open_count--; 1259 rdev->exclusive = 0; 1260 1261 module_put(rdev->owner); 1262 mutex_unlock(®ulator_list_mutex); 1263} 1264EXPORT_SYMBOL_GPL(regulator_put); 1265 1266static int _regulator_can_change_status(struct regulator_dev *rdev) 1267{ 1268 if (!rdev->constraints) 1269 return 0; 1270 1271 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1272 return 1; 1273 else 1274 return 0; 1275} 1276 1277/* locks held by regulator_enable() */ 1278static int _regulator_enable(struct regulator_dev *rdev) 1279{ 1280 int ret, delay; 1281 1282 if (rdev->use_count == 0) { 1283 /* do we need to enable the supply regulator first */ 1284 if (rdev->supply) { 1285 mutex_lock(&rdev->supply->mutex); 1286 ret = _regulator_enable(rdev->supply); 1287 mutex_unlock(&rdev->supply->mutex); 1288 if (ret < 0) { 1289 rdev_err(rdev, "failed to enable: %d\n", ret); 1290 return ret; 1291 } 1292 } 1293 } 1294 1295 /* check voltage and requested load before enabling */ 1296 if (rdev->constraints && 1297 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1298 drms_uA_update(rdev); 1299 1300 if (rdev->use_count == 0) { 1301 /* The regulator may on if it's not switchable or left on */ 1302 ret = _regulator_is_enabled(rdev); 1303 if (ret == -EINVAL || ret == 0) { 1304 if (!_regulator_can_change_status(rdev)) 1305 return -EPERM; 1306 1307 if (!rdev->desc->ops->enable) 1308 return -EINVAL; 1309 1310 /* Query before enabling in case configuration 1311 * dependant. */ 1312 ret = _regulator_get_enable_time(rdev); 1313 if (ret >= 0) { 1314 delay = ret; 1315 } else { 1316 rdev_warn(rdev, "enable_time() failed: %d\n", 1317 ret); 1318 delay = 0; 1319 } 1320 1321 trace_regulator_enable(rdev_get_name(rdev)); 1322 1323 /* Allow the regulator to ramp; it would be useful 1324 * to extend this for bulk operations so that the 1325 * regulators can ramp together. */ 1326 ret = rdev->desc->ops->enable(rdev); 1327 if (ret < 0) 1328 return ret; 1329 1330 trace_regulator_enable_delay(rdev_get_name(rdev)); 1331 1332 if (delay >= 1000) { 1333 mdelay(delay / 1000); 1334 udelay(delay % 1000); 1335 } else if (delay) { 1336 udelay(delay); 1337 } 1338 1339 trace_regulator_enable_complete(rdev_get_name(rdev)); 1340 1341 } else if (ret < 0) { 1342 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1343 return ret; 1344 } 1345 /* Fallthrough on positive return values - already enabled */ 1346 } 1347 1348 rdev->use_count++; 1349 1350 return 0; 1351} 1352 1353/** 1354 * regulator_enable - enable regulator output 1355 * @regulator: regulator source 1356 * 1357 * Request that the regulator be enabled with the regulator output at 1358 * the predefined voltage or current value. Calls to regulator_enable() 1359 * must be balanced with calls to regulator_disable(). 1360 * 1361 * NOTE: the output value can be set by other drivers, boot loader or may be 1362 * hardwired in the regulator. 1363 */ 1364int regulator_enable(struct regulator *regulator) 1365{ 1366 struct regulator_dev *rdev = regulator->rdev; 1367 int ret = 0; 1368 1369 mutex_lock(&rdev->mutex); 1370 ret = _regulator_enable(rdev); 1371 mutex_unlock(&rdev->mutex); 1372 return ret; 1373} 1374EXPORT_SYMBOL_GPL(regulator_enable); 1375 1376/* locks held by regulator_disable() */ 1377static int _regulator_disable(struct regulator_dev *rdev, 1378 struct regulator_dev **supply_rdev_ptr) 1379{ 1380 int ret = 0; 1381 *supply_rdev_ptr = NULL; 1382 1383 if (WARN(rdev->use_count <= 0, 1384 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1385 return -EIO; 1386 1387 /* are we the last user and permitted to disable ? */ 1388 if (rdev->use_count == 1 && 1389 (rdev->constraints && !rdev->constraints->always_on)) { 1390 1391 /* we are last user */ 1392 if (_regulator_can_change_status(rdev) && 1393 rdev->desc->ops->disable) { 1394 trace_regulator_disable(rdev_get_name(rdev)); 1395 1396 ret = rdev->desc->ops->disable(rdev); 1397 if (ret < 0) { 1398 rdev_err(rdev, "failed to disable\n"); 1399 return ret; 1400 } 1401 1402 trace_regulator_disable_complete(rdev_get_name(rdev)); 1403 1404 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1405 NULL); 1406 } 1407 1408 /* decrease our supplies ref count and disable if required */ 1409 *supply_rdev_ptr = rdev->supply; 1410 1411 rdev->use_count = 0; 1412 } else if (rdev->use_count > 1) { 1413 1414 if (rdev->constraints && 1415 (rdev->constraints->valid_ops_mask & 1416 REGULATOR_CHANGE_DRMS)) 1417 drms_uA_update(rdev); 1418 1419 rdev->use_count--; 1420 } 1421 return ret; 1422} 1423 1424/** 1425 * regulator_disable - disable regulator output 1426 * @regulator: regulator source 1427 * 1428 * Disable the regulator output voltage or current. Calls to 1429 * regulator_enable() must be balanced with calls to 1430 * regulator_disable(). 1431 * 1432 * NOTE: this will only disable the regulator output if no other consumer 1433 * devices have it enabled, the regulator device supports disabling and 1434 * machine constraints permit this operation. 1435 */ 1436int regulator_disable(struct regulator *regulator) 1437{ 1438 struct regulator_dev *rdev = regulator->rdev; 1439 struct regulator_dev *supply_rdev = NULL; 1440 int ret = 0; 1441 1442 mutex_lock(&rdev->mutex); 1443 ret = _regulator_disable(rdev, &supply_rdev); 1444 mutex_unlock(&rdev->mutex); 1445 1446 /* decrease our supplies ref count and disable if required */ 1447 while (supply_rdev != NULL) { 1448 rdev = supply_rdev; 1449 1450 mutex_lock(&rdev->mutex); 1451 _regulator_disable(rdev, &supply_rdev); 1452 mutex_unlock(&rdev->mutex); 1453 } 1454 1455 return ret; 1456} 1457EXPORT_SYMBOL_GPL(regulator_disable); 1458 1459/* locks held by regulator_force_disable() */ 1460static int _regulator_force_disable(struct regulator_dev *rdev, 1461 struct regulator_dev **supply_rdev_ptr) 1462{ 1463 int ret = 0; 1464 1465 /* force disable */ 1466 if (rdev->desc->ops->disable) { 1467 /* ah well, who wants to live forever... */ 1468 ret = rdev->desc->ops->disable(rdev); 1469 if (ret < 0) { 1470 rdev_err(rdev, "failed to force disable\n"); 1471 return ret; 1472 } 1473 /* notify other consumers that power has been forced off */ 1474 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1475 REGULATOR_EVENT_DISABLE, NULL); 1476 } 1477 1478 /* decrease our supplies ref count and disable if required */ 1479 *supply_rdev_ptr = rdev->supply; 1480 1481 rdev->use_count = 0; 1482 return ret; 1483} 1484 1485/** 1486 * regulator_force_disable - force disable regulator output 1487 * @regulator: regulator source 1488 * 1489 * Forcibly disable the regulator output voltage or current. 1490 * NOTE: this *will* disable the regulator output even if other consumer 1491 * devices have it enabled. This should be used for situations when device 1492 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1493 */ 1494int regulator_force_disable(struct regulator *regulator) 1495{ 1496 struct regulator_dev *supply_rdev = NULL; 1497 int ret; 1498 1499 mutex_lock(®ulator->rdev->mutex); 1500 regulator->uA_load = 0; 1501 ret = _regulator_force_disable(regulator->rdev, &supply_rdev); 1502 mutex_unlock(®ulator->rdev->mutex); 1503 1504 if (supply_rdev) 1505 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); 1506 1507 return ret; 1508} 1509EXPORT_SYMBOL_GPL(regulator_force_disable); 1510 1511static int _regulator_is_enabled(struct regulator_dev *rdev) 1512{ 1513 /* If we don't know then assume that the regulator is always on */ 1514 if (!rdev->desc->ops->is_enabled) 1515 return 1; 1516 1517 return rdev->desc->ops->is_enabled(rdev); 1518} 1519 1520/** 1521 * regulator_is_enabled - is the regulator output enabled 1522 * @regulator: regulator source 1523 * 1524 * Returns positive if the regulator driver backing the source/client 1525 * has requested that the device be enabled, zero if it hasn't, else a 1526 * negative errno code. 1527 * 1528 * Note that the device backing this regulator handle can have multiple 1529 * users, so it might be enabled even if regulator_enable() was never 1530 * called for this particular source. 1531 */ 1532int regulator_is_enabled(struct regulator *regulator) 1533{ 1534 int ret; 1535 1536 mutex_lock(®ulator->rdev->mutex); 1537 ret = _regulator_is_enabled(regulator->rdev); 1538 mutex_unlock(®ulator->rdev->mutex); 1539 1540 return ret; 1541} 1542EXPORT_SYMBOL_GPL(regulator_is_enabled); 1543 1544/** 1545 * regulator_count_voltages - count regulator_list_voltage() selectors 1546 * @regulator: regulator source 1547 * 1548 * Returns number of selectors, or negative errno. Selectors are 1549 * numbered starting at zero, and typically correspond to bitfields 1550 * in hardware registers. 1551 */ 1552int regulator_count_voltages(struct regulator *regulator) 1553{ 1554 struct regulator_dev *rdev = regulator->rdev; 1555 1556 return rdev->desc->n_voltages ? : -EINVAL; 1557} 1558EXPORT_SYMBOL_GPL(regulator_count_voltages); 1559 1560/** 1561 * regulator_list_voltage - enumerate supported voltages 1562 * @regulator: regulator source 1563 * @selector: identify voltage to list 1564 * Context: can sleep 1565 * 1566 * Returns a voltage that can be passed to @regulator_set_voltage(), 1567 * zero if this selector code can't be used on this system, or a 1568 * negative errno. 1569 */ 1570int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1571{ 1572 struct regulator_dev *rdev = regulator->rdev; 1573 struct regulator_ops *ops = rdev->desc->ops; 1574 int ret; 1575 1576 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1577 return -EINVAL; 1578 1579 mutex_lock(&rdev->mutex); 1580 ret = ops->list_voltage(rdev, selector); 1581 mutex_unlock(&rdev->mutex); 1582 1583 if (ret > 0) { 1584 if (ret < rdev->constraints->min_uV) 1585 ret = 0; 1586 else if (ret > rdev->constraints->max_uV) 1587 ret = 0; 1588 } 1589 1590 return ret; 1591} 1592EXPORT_SYMBOL_GPL(regulator_list_voltage); 1593 1594/** 1595 * regulator_is_supported_voltage - check if a voltage range can be supported 1596 * 1597 * @regulator: Regulator to check. 1598 * @min_uV: Minimum required voltage in uV. 1599 * @max_uV: Maximum required voltage in uV. 1600 * 1601 * Returns a boolean or a negative error code. 1602 */ 1603int regulator_is_supported_voltage(struct regulator *regulator, 1604 int min_uV, int max_uV) 1605{ 1606 int i, voltages, ret; 1607 1608 ret = regulator_count_voltages(regulator); 1609 if (ret < 0) 1610 return ret; 1611 voltages = ret; 1612 1613 for (i = 0; i < voltages; i++) { 1614 ret = regulator_list_voltage(regulator, i); 1615 1616 if (ret >= min_uV && ret <= max_uV) 1617 return 1; 1618 } 1619 1620 return 0; 1621} 1622 1623static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1624 int min_uV, int max_uV) 1625{ 1626 int ret; 1627 unsigned int selector; 1628 1629 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1630 1631 if (rdev->desc->ops->set_voltage) { 1632 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1633 &selector); 1634 1635 if (rdev->desc->ops->list_voltage) 1636 selector = rdev->desc->ops->list_voltage(rdev, 1637 selector); 1638 else 1639 selector = -1; 1640 } else if (rdev->desc->ops->set_voltage_sel) { 1641 int best_val = INT_MAX; 1642 int i; 1643 1644 selector = 0; 1645 1646 /* Find the smallest voltage that falls within the specified 1647 * range. 1648 */ 1649 for (i = 0; i < rdev->desc->n_voltages; i++) { 1650 ret = rdev->desc->ops->list_voltage(rdev, i); 1651 if (ret < 0) 1652 continue; 1653 1654 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1655 best_val = ret; 1656 selector = i; 1657 } 1658 } 1659 1660 if (best_val != INT_MAX) { 1661 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1662 selector = best_val; 1663 } else { 1664 ret = -EINVAL; 1665 } 1666 } else { 1667 ret = -EINVAL; 1668 } 1669 1670 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1671 1672 return ret; 1673} 1674 1675/** 1676 * regulator_set_voltage - set regulator output voltage 1677 * @regulator: regulator source 1678 * @min_uV: Minimum required voltage in uV 1679 * @max_uV: Maximum acceptable voltage in uV 1680 * 1681 * Sets a voltage regulator to the desired output voltage. This can be set 1682 * during any regulator state. IOW, regulator can be disabled or enabled. 1683 * 1684 * If the regulator is enabled then the voltage will change to the new value 1685 * immediately otherwise if the regulator is disabled the regulator will 1686 * output at the new voltage when enabled. 1687 * 1688 * NOTE: If the regulator is shared between several devices then the lowest 1689 * request voltage that meets the system constraints will be used. 1690 * Regulator system constraints must be set for this regulator before 1691 * calling this function otherwise this call will fail. 1692 */ 1693int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1694{ 1695 struct regulator_dev *rdev = regulator->rdev; 1696 int ret; 1697 1698 mutex_lock(&rdev->mutex); 1699 1700 /* sanity check */ 1701 if (!rdev->desc->ops->set_voltage && 1702 !rdev->desc->ops->set_voltage_sel) { 1703 ret = -EINVAL; 1704 goto out; 1705 } 1706 1707 /* constraints check */ 1708 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1709 if (ret < 0) 1710 goto out; 1711 regulator->min_uV = min_uV; 1712 regulator->max_uV = max_uV; 1713 1714 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1715 if (ret < 0) 1716 goto out; 1717 1718 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1719 1720out: 1721 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1722 mutex_unlock(&rdev->mutex); 1723 return ret; 1724} 1725EXPORT_SYMBOL_GPL(regulator_set_voltage); 1726 1727static int _regulator_get_voltage(struct regulator_dev *rdev) 1728{ 1729 int sel; 1730 1731 if (rdev->desc->ops->get_voltage_sel) { 1732 sel = rdev->desc->ops->get_voltage_sel(rdev); 1733 if (sel < 0) 1734 return sel; 1735 return rdev->desc->ops->list_voltage(rdev, sel); 1736 } 1737 if (rdev->desc->ops->get_voltage) 1738 return rdev->desc->ops->get_voltage(rdev); 1739 else 1740 return -EINVAL; 1741} 1742 1743/** 1744 * regulator_get_voltage - get regulator output voltage 1745 * @regulator: regulator source 1746 * 1747 * This returns the current regulator voltage in uV. 1748 * 1749 * NOTE: If the regulator is disabled it will return the voltage value. This 1750 * function should not be used to determine regulator state. 1751 */ 1752int regulator_get_voltage(struct regulator *regulator) 1753{ 1754 int ret; 1755 1756 mutex_lock(®ulator->rdev->mutex); 1757 1758 ret = _regulator_get_voltage(regulator->rdev); 1759 1760 mutex_unlock(®ulator->rdev->mutex); 1761 1762 return ret; 1763} 1764EXPORT_SYMBOL_GPL(regulator_get_voltage); 1765 1766/** 1767 * regulator_set_current_limit - set regulator output current limit 1768 * @regulator: regulator source 1769 * @min_uA: Minimuum supported current in uA 1770 * @max_uA: Maximum supported current in uA 1771 * 1772 * Sets current sink to the desired output current. This can be set during 1773 * any regulator state. IOW, regulator can be disabled or enabled. 1774 * 1775 * If the regulator is enabled then the current will change to the new value 1776 * immediately otherwise if the regulator is disabled the regulator will 1777 * output at the new current when enabled. 1778 * 1779 * NOTE: Regulator system constraints must be set for this regulator before 1780 * calling this function otherwise this call will fail. 1781 */ 1782int regulator_set_current_limit(struct regulator *regulator, 1783 int min_uA, int max_uA) 1784{ 1785 struct regulator_dev *rdev = regulator->rdev; 1786 int ret; 1787 1788 mutex_lock(&rdev->mutex); 1789 1790 /* sanity check */ 1791 if (!rdev->desc->ops->set_current_limit) { 1792 ret = -EINVAL; 1793 goto out; 1794 } 1795 1796 /* constraints check */ 1797 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1798 if (ret < 0) 1799 goto out; 1800 1801 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1802out: 1803 mutex_unlock(&rdev->mutex); 1804 return ret; 1805} 1806EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1807 1808static int _regulator_get_current_limit(struct regulator_dev *rdev) 1809{ 1810 int ret; 1811 1812 mutex_lock(&rdev->mutex); 1813 1814 /* sanity check */ 1815 if (!rdev->desc->ops->get_current_limit) { 1816 ret = -EINVAL; 1817 goto out; 1818 } 1819 1820 ret = rdev->desc->ops->get_current_limit(rdev); 1821out: 1822 mutex_unlock(&rdev->mutex); 1823 return ret; 1824} 1825 1826/** 1827 * regulator_get_current_limit - get regulator output current 1828 * @regulator: regulator source 1829 * 1830 * This returns the current supplied by the specified current sink in uA. 1831 * 1832 * NOTE: If the regulator is disabled it will return the current value. This 1833 * function should not be used to determine regulator state. 1834 */ 1835int regulator_get_current_limit(struct regulator *regulator) 1836{ 1837 return _regulator_get_current_limit(regulator->rdev); 1838} 1839EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1840 1841/** 1842 * regulator_set_mode - set regulator operating mode 1843 * @regulator: regulator source 1844 * @mode: operating mode - one of the REGULATOR_MODE constants 1845 * 1846 * Set regulator operating mode to increase regulator efficiency or improve 1847 * regulation performance. 1848 * 1849 * NOTE: Regulator system constraints must be set for this regulator before 1850 * calling this function otherwise this call will fail. 1851 */ 1852int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1853{ 1854 struct regulator_dev *rdev = regulator->rdev; 1855 int ret; 1856 int regulator_curr_mode; 1857 1858 mutex_lock(&rdev->mutex); 1859 1860 /* sanity check */ 1861 if (!rdev->desc->ops->set_mode) { 1862 ret = -EINVAL; 1863 goto out; 1864 } 1865 1866 /* return if the same mode is requested */ 1867 if (rdev->desc->ops->get_mode) { 1868 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1869 if (regulator_curr_mode == mode) { 1870 ret = 0; 1871 goto out; 1872 } 1873 } 1874 1875 /* constraints check */ 1876 ret = regulator_check_mode(rdev, mode); 1877 if (ret < 0) 1878 goto out; 1879 1880 ret = rdev->desc->ops->set_mode(rdev, mode); 1881out: 1882 mutex_unlock(&rdev->mutex); 1883 return ret; 1884} 1885EXPORT_SYMBOL_GPL(regulator_set_mode); 1886 1887static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1888{ 1889 int ret; 1890 1891 mutex_lock(&rdev->mutex); 1892 1893 /* sanity check */ 1894 if (!rdev->desc->ops->get_mode) { 1895 ret = -EINVAL; 1896 goto out; 1897 } 1898 1899 ret = rdev->desc->ops->get_mode(rdev); 1900out: 1901 mutex_unlock(&rdev->mutex); 1902 return ret; 1903} 1904 1905/** 1906 * regulator_get_mode - get regulator operating mode 1907 * @regulator: regulator source 1908 * 1909 * Get the current regulator operating mode. 1910 */ 1911unsigned int regulator_get_mode(struct regulator *regulator) 1912{ 1913 return _regulator_get_mode(regulator->rdev); 1914} 1915EXPORT_SYMBOL_GPL(regulator_get_mode); 1916 1917/** 1918 * regulator_set_optimum_mode - set regulator optimum operating mode 1919 * @regulator: regulator source 1920 * @uA_load: load current 1921 * 1922 * Notifies the regulator core of a new device load. This is then used by 1923 * DRMS (if enabled by constraints) to set the most efficient regulator 1924 * operating mode for the new regulator loading. 1925 * 1926 * Consumer devices notify their supply regulator of the maximum power 1927 * they will require (can be taken from device datasheet in the power 1928 * consumption tables) when they change operational status and hence power 1929 * state. Examples of operational state changes that can affect power 1930 * consumption are :- 1931 * 1932 * o Device is opened / closed. 1933 * o Device I/O is about to begin or has just finished. 1934 * o Device is idling in between work. 1935 * 1936 * This information is also exported via sysfs to userspace. 1937 * 1938 * DRMS will sum the total requested load on the regulator and change 1939 * to the most efficient operating mode if platform constraints allow. 1940 * 1941 * Returns the new regulator mode or error. 1942 */ 1943int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1944{ 1945 struct regulator_dev *rdev = regulator->rdev; 1946 struct regulator *consumer; 1947 int ret, output_uV, input_uV, total_uA_load = 0; 1948 unsigned int mode; 1949 1950 mutex_lock(&rdev->mutex); 1951 1952 regulator->uA_load = uA_load; 1953 ret = regulator_check_drms(rdev); 1954 if (ret < 0) 1955 goto out; 1956 ret = -EINVAL; 1957 1958 /* sanity check */ 1959 if (!rdev->desc->ops->get_optimum_mode) 1960 goto out; 1961 1962 /* get output voltage */ 1963 output_uV = _regulator_get_voltage(rdev); 1964 if (output_uV <= 0) { 1965 rdev_err(rdev, "invalid output voltage found\n"); 1966 goto out; 1967 } 1968 1969 /* get input voltage */ 1970 input_uV = 0; 1971 if (rdev->supply) 1972 input_uV = _regulator_get_voltage(rdev->supply); 1973 if (input_uV <= 0) 1974 input_uV = rdev->constraints->input_uV; 1975 if (input_uV <= 0) { 1976 rdev_err(rdev, "invalid input voltage found\n"); 1977 goto out; 1978 } 1979 1980 /* calc total requested load for this regulator */ 1981 list_for_each_entry(consumer, &rdev->consumer_list, list) 1982 total_uA_load += consumer->uA_load; 1983 1984 mode = rdev->desc->ops->get_optimum_mode(rdev, 1985 input_uV, output_uV, 1986 total_uA_load); 1987 ret = regulator_check_mode(rdev, mode); 1988 if (ret < 0) { 1989 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 1990 total_uA_load, input_uV, output_uV); 1991 goto out; 1992 } 1993 1994 ret = rdev->desc->ops->set_mode(rdev, mode); 1995 if (ret < 0) { 1996 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 1997 goto out; 1998 } 1999 ret = mode; 2000out: 2001 mutex_unlock(&rdev->mutex); 2002 return ret; 2003} 2004EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2005 2006/** 2007 * regulator_register_notifier - register regulator event notifier 2008 * @regulator: regulator source 2009 * @nb: notifier block 2010 * 2011 * Register notifier block to receive regulator events. 2012 */ 2013int regulator_register_notifier(struct regulator *regulator, 2014 struct notifier_block *nb) 2015{ 2016 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2017 nb); 2018} 2019EXPORT_SYMBOL_GPL(regulator_register_notifier); 2020 2021/** 2022 * regulator_unregister_notifier - unregister regulator event notifier 2023 * @regulator: regulator source 2024 * @nb: notifier block 2025 * 2026 * Unregister regulator event notifier block. 2027 */ 2028int regulator_unregister_notifier(struct regulator *regulator, 2029 struct notifier_block *nb) 2030{ 2031 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2032 nb); 2033} 2034EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2035 2036/* notify regulator consumers and downstream regulator consumers. 2037 * Note mutex must be held by caller. 2038 */ 2039static void _notifier_call_chain(struct regulator_dev *rdev, 2040 unsigned long event, void *data) 2041{ 2042 struct regulator_dev *_rdev; 2043 2044 /* call rdev chain first */ 2045 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2046 2047 /* now notify regulator we supply */ 2048 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 2049 mutex_lock(&_rdev->mutex); 2050 _notifier_call_chain(_rdev, event, data); 2051 mutex_unlock(&_rdev->mutex); 2052 } 2053} 2054 2055/** 2056 * regulator_bulk_get - get multiple regulator consumers 2057 * 2058 * @dev: Device to supply 2059 * @num_consumers: Number of consumers to register 2060 * @consumers: Configuration of consumers; clients are stored here. 2061 * 2062 * @return 0 on success, an errno on failure. 2063 * 2064 * This helper function allows drivers to get several regulator 2065 * consumers in one operation. If any of the regulators cannot be 2066 * acquired then any regulators that were allocated will be freed 2067 * before returning to the caller. 2068 */ 2069int regulator_bulk_get(struct device *dev, int num_consumers, 2070 struct regulator_bulk_data *consumers) 2071{ 2072 int i; 2073 int ret; 2074 2075 for (i = 0; i < num_consumers; i++) 2076 consumers[i].consumer = NULL; 2077 2078 for (i = 0; i < num_consumers; i++) { 2079 consumers[i].consumer = regulator_get(dev, 2080 consumers[i].supply); 2081 if (IS_ERR(consumers[i].consumer)) { 2082 ret = PTR_ERR(consumers[i].consumer); 2083 dev_err(dev, "Failed to get supply '%s': %d\n", 2084 consumers[i].supply, ret); 2085 consumers[i].consumer = NULL; 2086 goto err; 2087 } 2088 } 2089 2090 return 0; 2091 2092err: 2093 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2094 regulator_put(consumers[i].consumer); 2095 2096 return ret; 2097} 2098EXPORT_SYMBOL_GPL(regulator_bulk_get); 2099 2100/** 2101 * regulator_bulk_enable - enable multiple regulator consumers 2102 * 2103 * @num_consumers: Number of consumers 2104 * @consumers: Consumer data; clients are stored here. 2105 * @return 0 on success, an errno on failure 2106 * 2107 * This convenience API allows consumers to enable multiple regulator 2108 * clients in a single API call. If any consumers cannot be enabled 2109 * then any others that were enabled will be disabled again prior to 2110 * return. 2111 */ 2112int regulator_bulk_enable(int num_consumers, 2113 struct regulator_bulk_data *consumers) 2114{ 2115 int i; 2116 int ret; 2117 2118 for (i = 0; i < num_consumers; i++) { 2119 ret = regulator_enable(consumers[i].consumer); 2120 if (ret != 0) 2121 goto err; 2122 } 2123 2124 return 0; 2125 2126err: 2127 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2128 for (--i; i >= 0; --i) 2129 regulator_disable(consumers[i].consumer); 2130 2131 return ret; 2132} 2133EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2134 2135/** 2136 * regulator_bulk_disable - disable multiple regulator consumers 2137 * 2138 * @num_consumers: Number of consumers 2139 * @consumers: Consumer data; clients are stored here. 2140 * @return 0 on success, an errno on failure 2141 * 2142 * This convenience API allows consumers to disable multiple regulator 2143 * clients in a single API call. If any consumers cannot be enabled 2144 * then any others that were disabled will be disabled again prior to 2145 * return. 2146 */ 2147int regulator_bulk_disable(int num_consumers, 2148 struct regulator_bulk_data *consumers) 2149{ 2150 int i; 2151 int ret; 2152 2153 for (i = 0; i < num_consumers; i++) { 2154 ret = regulator_disable(consumers[i].consumer); 2155 if (ret != 0) 2156 goto err; 2157 } 2158 2159 return 0; 2160 2161err: 2162 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2163 for (--i; i >= 0; --i) 2164 regulator_enable(consumers[i].consumer); 2165 2166 return ret; 2167} 2168EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2169 2170/** 2171 * regulator_bulk_free - free multiple regulator consumers 2172 * 2173 * @num_consumers: Number of consumers 2174 * @consumers: Consumer data; clients are stored here. 2175 * 2176 * This convenience API allows consumers to free multiple regulator 2177 * clients in a single API call. 2178 */ 2179void regulator_bulk_free(int num_consumers, 2180 struct regulator_bulk_data *consumers) 2181{ 2182 int i; 2183 2184 for (i = 0; i < num_consumers; i++) { 2185 regulator_put(consumers[i].consumer); 2186 consumers[i].consumer = NULL; 2187 } 2188} 2189EXPORT_SYMBOL_GPL(regulator_bulk_free); 2190 2191/** 2192 * regulator_notifier_call_chain - call regulator event notifier 2193 * @rdev: regulator source 2194 * @event: notifier block 2195 * @data: callback-specific data. 2196 * 2197 * Called by regulator drivers to notify clients a regulator event has 2198 * occurred. We also notify regulator clients downstream. 2199 * Note lock must be held by caller. 2200 */ 2201int regulator_notifier_call_chain(struct regulator_dev *rdev, 2202 unsigned long event, void *data) 2203{ 2204 _notifier_call_chain(rdev, event, data); 2205 return NOTIFY_DONE; 2206 2207} 2208EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2209 2210/** 2211 * regulator_mode_to_status - convert a regulator mode into a status 2212 * 2213 * @mode: Mode to convert 2214 * 2215 * Convert a regulator mode into a status. 2216 */ 2217int regulator_mode_to_status(unsigned int mode) 2218{ 2219 switch (mode) { 2220 case REGULATOR_MODE_FAST: 2221 return REGULATOR_STATUS_FAST; 2222 case REGULATOR_MODE_NORMAL: 2223 return REGULATOR_STATUS_NORMAL; 2224 case REGULATOR_MODE_IDLE: 2225 return REGULATOR_STATUS_IDLE; 2226 case REGULATOR_STATUS_STANDBY: 2227 return REGULATOR_STATUS_STANDBY; 2228 default: 2229 return 0; 2230 } 2231} 2232EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2233 2234/* 2235 * To avoid cluttering sysfs (and memory) with useless state, only 2236 * create attributes that can be meaningfully displayed. 2237 */ 2238static int add_regulator_attributes(struct regulator_dev *rdev) 2239{ 2240 struct device *dev = &rdev->dev; 2241 struct regulator_ops *ops = rdev->desc->ops; 2242 int status = 0; 2243 2244 /* some attributes need specific methods to be displayed */ 2245 if (ops->get_voltage || ops->get_voltage_sel) { 2246 status = device_create_file(dev, &dev_attr_microvolts); 2247 if (status < 0) 2248 return status; 2249 } 2250 if (ops->get_current_limit) { 2251 status = device_create_file(dev, &dev_attr_microamps); 2252 if (status < 0) 2253 return status; 2254 } 2255 if (ops->get_mode) { 2256 status = device_create_file(dev, &dev_attr_opmode); 2257 if (status < 0) 2258 return status; 2259 } 2260 if (ops->is_enabled) { 2261 status = device_create_file(dev, &dev_attr_state); 2262 if (status < 0) 2263 return status; 2264 } 2265 if (ops->get_status) { 2266 status = device_create_file(dev, &dev_attr_status); 2267 if (status < 0) 2268 return status; 2269 } 2270 2271 /* some attributes are type-specific */ 2272 if (rdev->desc->type == REGULATOR_CURRENT) { 2273 status = device_create_file(dev, &dev_attr_requested_microamps); 2274 if (status < 0) 2275 return status; 2276 } 2277 2278 /* all the other attributes exist to support constraints; 2279 * don't show them if there are no constraints, or if the 2280 * relevant supporting methods are missing. 2281 */ 2282 if (!rdev->constraints) 2283 return status; 2284 2285 /* constraints need specific supporting methods */ 2286 if (ops->set_voltage || ops->set_voltage_sel) { 2287 status = device_create_file(dev, &dev_attr_min_microvolts); 2288 if (status < 0) 2289 return status; 2290 status = device_create_file(dev, &dev_attr_max_microvolts); 2291 if (status < 0) 2292 return status; 2293 } 2294 if (ops->set_current_limit) { 2295 status = device_create_file(dev, &dev_attr_min_microamps); 2296 if (status < 0) 2297 return status; 2298 status = device_create_file(dev, &dev_attr_max_microamps); 2299 if (status < 0) 2300 return status; 2301 } 2302 2303 /* suspend mode constraints need multiple supporting methods */ 2304 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2305 return status; 2306 2307 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2308 if (status < 0) 2309 return status; 2310 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2311 if (status < 0) 2312 return status; 2313 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2314 if (status < 0) 2315 return status; 2316 2317 if (ops->set_suspend_voltage) { 2318 status = device_create_file(dev, 2319 &dev_attr_suspend_standby_microvolts); 2320 if (status < 0) 2321 return status; 2322 status = device_create_file(dev, 2323 &dev_attr_suspend_mem_microvolts); 2324 if (status < 0) 2325 return status; 2326 status = device_create_file(dev, 2327 &dev_attr_suspend_disk_microvolts); 2328 if (status < 0) 2329 return status; 2330 } 2331 2332 if (ops->set_suspend_mode) { 2333 status = device_create_file(dev, 2334 &dev_attr_suspend_standby_mode); 2335 if (status < 0) 2336 return status; 2337 status = device_create_file(dev, 2338 &dev_attr_suspend_mem_mode); 2339 if (status < 0) 2340 return status; 2341 status = device_create_file(dev, 2342 &dev_attr_suspend_disk_mode); 2343 if (status < 0) 2344 return status; 2345 } 2346 2347 return status; 2348} 2349 2350/** 2351 * regulator_register - register regulator 2352 * @regulator_desc: regulator to register 2353 * @dev: struct device for the regulator 2354 * @init_data: platform provided init data, passed through by driver 2355 * @driver_data: private regulator data 2356 * 2357 * Called by regulator drivers to register a regulator. 2358 * Returns 0 on success. 2359 */ 2360struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2361 struct device *dev, const struct regulator_init_data *init_data, 2362 void *driver_data) 2363{ 2364 static atomic_t regulator_no = ATOMIC_INIT(0); 2365 struct regulator_dev *rdev; 2366 int ret, i; 2367 2368 if (regulator_desc == NULL) 2369 return ERR_PTR(-EINVAL); 2370 2371 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2372 return ERR_PTR(-EINVAL); 2373 2374 if (regulator_desc->type != REGULATOR_VOLTAGE && 2375 regulator_desc->type != REGULATOR_CURRENT) 2376 return ERR_PTR(-EINVAL); 2377 2378 if (!init_data) 2379 return ERR_PTR(-EINVAL); 2380 2381 /* Only one of each should be implemented */ 2382 WARN_ON(regulator_desc->ops->get_voltage && 2383 regulator_desc->ops->get_voltage_sel); 2384 WARN_ON(regulator_desc->ops->set_voltage && 2385 regulator_desc->ops->set_voltage_sel); 2386 2387 /* If we're using selectors we must implement list_voltage. */ 2388 if (regulator_desc->ops->get_voltage_sel && 2389 !regulator_desc->ops->list_voltage) { 2390 return ERR_PTR(-EINVAL); 2391 } 2392 if (regulator_desc->ops->set_voltage_sel && 2393 !regulator_desc->ops->list_voltage) { 2394 return ERR_PTR(-EINVAL); 2395 } 2396 2397 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2398 if (rdev == NULL) 2399 return ERR_PTR(-ENOMEM); 2400 2401 mutex_lock(®ulator_list_mutex); 2402 2403 mutex_init(&rdev->mutex); 2404 rdev->reg_data = driver_data; 2405 rdev->owner = regulator_desc->owner; 2406 rdev->desc = regulator_desc; 2407 INIT_LIST_HEAD(&rdev->consumer_list); 2408 INIT_LIST_HEAD(&rdev->supply_list); 2409 INIT_LIST_HEAD(&rdev->list); 2410 INIT_LIST_HEAD(&rdev->slist); 2411 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2412 2413 /* preform any regulator specific init */ 2414 if (init_data->regulator_init) { 2415 ret = init_data->regulator_init(rdev->reg_data); 2416 if (ret < 0) 2417 goto clean; 2418 } 2419 2420 /* register with sysfs */ 2421 rdev->dev.class = ®ulator_class; 2422 rdev->dev.parent = dev; 2423 dev_set_name(&rdev->dev, "regulator.%d", 2424 atomic_inc_return(®ulator_no) - 1); 2425 ret = device_register(&rdev->dev); 2426 if (ret != 0) { 2427 put_device(&rdev->dev); 2428 goto clean; 2429 } 2430 2431 dev_set_drvdata(&rdev->dev, rdev); 2432 2433 /* set regulator constraints */ 2434 ret = set_machine_constraints(rdev, &init_data->constraints); 2435 if (ret < 0) 2436 goto scrub; 2437 2438 /* add attributes supported by this regulator */ 2439 ret = add_regulator_attributes(rdev); 2440 if (ret < 0) 2441 goto scrub; 2442 2443 /* set supply regulator if it exists */ 2444 if (init_data->supply_regulator && init_data->supply_regulator_dev) { 2445 dev_err(dev, 2446 "Supply regulator specified by both name and dev\n"); 2447 ret = -EINVAL; 2448 goto scrub; 2449 } 2450 2451 if (init_data->supply_regulator) { 2452 struct regulator_dev *r; 2453 int found = 0; 2454 2455 list_for_each_entry(r, ®ulator_list, list) { 2456 if (strcmp(rdev_get_name(r), 2457 init_data->supply_regulator) == 0) { 2458 found = 1; 2459 break; 2460 } 2461 } 2462 2463 if (!found) { 2464 dev_err(dev, "Failed to find supply %s\n", 2465 init_data->supply_regulator); 2466 ret = -ENODEV; 2467 goto scrub; 2468 } 2469 2470 ret = set_supply(rdev, r); 2471 if (ret < 0) 2472 goto scrub; 2473 } 2474 2475 if (init_data->supply_regulator_dev) { 2476 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2477 ret = set_supply(rdev, 2478 dev_get_drvdata(init_data->supply_regulator_dev)); 2479 if (ret < 0) 2480 goto scrub; 2481 } 2482 2483 /* add consumers devices */ 2484 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2485 ret = set_consumer_device_supply(rdev, 2486 init_data->consumer_supplies[i].dev, 2487 init_data->consumer_supplies[i].dev_name, 2488 init_data->consumer_supplies[i].supply); 2489 if (ret < 0) 2490 goto unset_supplies; 2491 } 2492 2493 list_add(&rdev->list, ®ulator_list); 2494out: 2495 mutex_unlock(®ulator_list_mutex); 2496 return rdev; 2497 2498unset_supplies: 2499 unset_regulator_supplies(rdev); 2500 2501scrub: 2502 device_unregister(&rdev->dev); 2503 /* device core frees rdev */ 2504 rdev = ERR_PTR(ret); 2505 goto out; 2506 2507clean: 2508 kfree(rdev); 2509 rdev = ERR_PTR(ret); 2510 goto out; 2511} 2512EXPORT_SYMBOL_GPL(regulator_register); 2513 2514/** 2515 * regulator_unregister - unregister regulator 2516 * @rdev: regulator to unregister 2517 * 2518 * Called by regulator drivers to unregister a regulator. 2519 */ 2520void regulator_unregister(struct regulator_dev *rdev) 2521{ 2522 if (rdev == NULL) 2523 return; 2524 2525 mutex_lock(®ulator_list_mutex); 2526 WARN_ON(rdev->open_count); 2527 unset_regulator_supplies(rdev); 2528 list_del(&rdev->list); 2529 if (rdev->supply) 2530 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2531 device_unregister(&rdev->dev); 2532 kfree(rdev->constraints); 2533 mutex_unlock(®ulator_list_mutex); 2534} 2535EXPORT_SYMBOL_GPL(regulator_unregister); 2536 2537/** 2538 * regulator_suspend_prepare - prepare regulators for system wide suspend 2539 * @state: system suspend state 2540 * 2541 * Configure each regulator with it's suspend operating parameters for state. 2542 * This will usually be called by machine suspend code prior to supending. 2543 */ 2544int regulator_suspend_prepare(suspend_state_t state) 2545{ 2546 struct regulator_dev *rdev; 2547 int ret = 0; 2548 2549 /* ON is handled by regulator active state */ 2550 if (state == PM_SUSPEND_ON) 2551 return -EINVAL; 2552 2553 mutex_lock(®ulator_list_mutex); 2554 list_for_each_entry(rdev, ®ulator_list, list) { 2555 2556 mutex_lock(&rdev->mutex); 2557 ret = suspend_prepare(rdev, state); 2558 mutex_unlock(&rdev->mutex); 2559 2560 if (ret < 0) { 2561 rdev_err(rdev, "failed to prepare\n"); 2562 goto out; 2563 } 2564 } 2565out: 2566 mutex_unlock(®ulator_list_mutex); 2567 return ret; 2568} 2569EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2570 2571/** 2572 * regulator_has_full_constraints - the system has fully specified constraints 2573 * 2574 * Calling this function will cause the regulator API to disable all 2575 * regulators which have a zero use count and don't have an always_on 2576 * constraint in a late_initcall. 2577 * 2578 * The intention is that this will become the default behaviour in a 2579 * future kernel release so users are encouraged to use this facility 2580 * now. 2581 */ 2582void regulator_has_full_constraints(void) 2583{ 2584 has_full_constraints = 1; 2585} 2586EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2587 2588/** 2589 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2590 * 2591 * Calling this function will cause the regulator API to provide a 2592 * dummy regulator to consumers if no physical regulator is found, 2593 * allowing most consumers to proceed as though a regulator were 2594 * configured. This allows systems such as those with software 2595 * controllable regulators for the CPU core only to be brought up more 2596 * readily. 2597 */ 2598void regulator_use_dummy_regulator(void) 2599{ 2600 board_wants_dummy_regulator = true; 2601} 2602EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2603 2604/** 2605 * rdev_get_drvdata - get rdev regulator driver data 2606 * @rdev: regulator 2607 * 2608 * Get rdev regulator driver private data. This call can be used in the 2609 * regulator driver context. 2610 */ 2611void *rdev_get_drvdata(struct regulator_dev *rdev) 2612{ 2613 return rdev->reg_data; 2614} 2615EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2616 2617/** 2618 * regulator_get_drvdata - get regulator driver data 2619 * @regulator: regulator 2620 * 2621 * Get regulator driver private data. This call can be used in the consumer 2622 * driver context when non API regulator specific functions need to be called. 2623 */ 2624void *regulator_get_drvdata(struct regulator *regulator) 2625{ 2626 return regulator->rdev->reg_data; 2627} 2628EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2629 2630/** 2631 * regulator_set_drvdata - set regulator driver data 2632 * @regulator: regulator 2633 * @data: data 2634 */ 2635void regulator_set_drvdata(struct regulator *regulator, void *data) 2636{ 2637 regulator->rdev->reg_data = data; 2638} 2639EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2640 2641/** 2642 * regulator_get_id - get regulator ID 2643 * @rdev: regulator 2644 */ 2645int rdev_get_id(struct regulator_dev *rdev) 2646{ 2647 return rdev->desc->id; 2648} 2649EXPORT_SYMBOL_GPL(rdev_get_id); 2650 2651struct device *rdev_get_dev(struct regulator_dev *rdev) 2652{ 2653 return &rdev->dev; 2654} 2655EXPORT_SYMBOL_GPL(rdev_get_dev); 2656 2657void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2658{ 2659 return reg_init_data->driver_data; 2660} 2661EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2662 2663static int __init regulator_init(void) 2664{ 2665 int ret; 2666 2667 ret = class_register(®ulator_class); 2668 2669 regulator_dummy_init(); 2670 2671 return ret; 2672} 2673 2674/* init early to allow our consumers to complete system booting */ 2675core_initcall(regulator_init); 2676 2677static int __init regulator_init_complete(void) 2678{ 2679 struct regulator_dev *rdev; 2680 struct regulator_ops *ops; 2681 struct regulation_constraints *c; 2682 int enabled, ret; 2683 2684 mutex_lock(®ulator_list_mutex); 2685 2686 /* If we have a full configuration then disable any regulators 2687 * which are not in use or always_on. This will become the 2688 * default behaviour in the future. 2689 */ 2690 list_for_each_entry(rdev, ®ulator_list, list) { 2691 ops = rdev->desc->ops; 2692 c = rdev->constraints; 2693 2694 if (!ops->disable || (c && c->always_on)) 2695 continue; 2696 2697 mutex_lock(&rdev->mutex); 2698 2699 if (rdev->use_count) 2700 goto unlock; 2701 2702 /* If we can't read the status assume it's on. */ 2703 if (ops->is_enabled) 2704 enabled = ops->is_enabled(rdev); 2705 else 2706 enabled = 1; 2707 2708 if (!enabled) 2709 goto unlock; 2710 2711 if (has_full_constraints) { 2712 /* We log since this may kill the system if it 2713 * goes wrong. */ 2714 rdev_info(rdev, "disabling\n"); 2715 ret = ops->disable(rdev); 2716 if (ret != 0) { 2717 rdev_err(rdev, "couldn't disable: %d\n", ret); 2718 } 2719 } else { 2720 /* The intention is that in future we will 2721 * assume that full constraints are provided 2722 * so warn even if we aren't going to do 2723 * anything here. 2724 */ 2725 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 2726 } 2727 2728unlock: 2729 mutex_unlock(&rdev->mutex); 2730 } 2731 2732 mutex_unlock(®ulator_list_mutex); 2733 2734 return 0; 2735} 2736late_initcall(regulator_init_complete); 2737