core.c revision 50f075963f127d713ff0c30359baefc0f89d9ae2
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#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/device.h> 19#include <linux/err.h> 20#include <linux/mutex.h> 21#include <linux/suspend.h> 22#include <linux/regulator/consumer.h> 23#include <linux/regulator/driver.h> 24#include <linux/regulator/machine.h> 25 26#define REGULATOR_VERSION "0.5" 27 28static DEFINE_MUTEX(regulator_list_mutex); 29static LIST_HEAD(regulator_list); 30static LIST_HEAD(regulator_map_list); 31 32/* 33 * struct regulator_map 34 * 35 * Used to provide symbolic supply names to devices. 36 */ 37struct regulator_map { 38 struct list_head list; 39 struct device *dev; 40 const char *supply; 41 struct regulator_dev *regulator; 42}; 43 44/* 45 * struct regulator 46 * 47 * One for each consumer device. 48 */ 49struct regulator { 50 struct device *dev; 51 struct list_head list; 52 int uA_load; 53 int min_uV; 54 int max_uV; 55 char *supply_name; 56 struct device_attribute dev_attr; 57 struct regulator_dev *rdev; 58}; 59 60static int _regulator_is_enabled(struct regulator_dev *rdev); 61static int _regulator_disable(struct regulator_dev *rdev); 62static int _regulator_get_voltage(struct regulator_dev *rdev); 63static int _regulator_get_current_limit(struct regulator_dev *rdev); 64static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 65static void _notifier_call_chain(struct regulator_dev *rdev, 66 unsigned long event, void *data); 67 68/* gets the regulator for a given consumer device */ 69static struct regulator *get_device_regulator(struct device *dev) 70{ 71 struct regulator *regulator = NULL; 72 struct regulator_dev *rdev; 73 74 mutex_lock(®ulator_list_mutex); 75 list_for_each_entry(rdev, ®ulator_list, list) { 76 mutex_lock(&rdev->mutex); 77 list_for_each_entry(regulator, &rdev->consumer_list, list) { 78 if (regulator->dev == dev) { 79 mutex_unlock(&rdev->mutex); 80 mutex_unlock(®ulator_list_mutex); 81 return regulator; 82 } 83 } 84 mutex_unlock(&rdev->mutex); 85 } 86 mutex_unlock(®ulator_list_mutex); 87 return NULL; 88} 89 90/* Platform voltage constraint check */ 91static int regulator_check_voltage(struct regulator_dev *rdev, 92 int *min_uV, int *max_uV) 93{ 94 BUG_ON(*min_uV > *max_uV); 95 96 if (!rdev->constraints) { 97 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 98 rdev->desc->name); 99 return -ENODEV; 100 } 101 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 102 printk(KERN_ERR "%s: operation not allowed for %s\n", 103 __func__, rdev->desc->name); 104 return -EPERM; 105 } 106 107 if (*max_uV > rdev->constraints->max_uV) 108 *max_uV = rdev->constraints->max_uV; 109 if (*min_uV < rdev->constraints->min_uV) 110 *min_uV = rdev->constraints->min_uV; 111 112 if (*min_uV > *max_uV) 113 return -EINVAL; 114 115 return 0; 116} 117 118/* current constraint check */ 119static int regulator_check_current_limit(struct regulator_dev *rdev, 120 int *min_uA, int *max_uA) 121{ 122 BUG_ON(*min_uA > *max_uA); 123 124 if (!rdev->constraints) { 125 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 126 rdev->desc->name); 127 return -ENODEV; 128 } 129 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 130 printk(KERN_ERR "%s: operation not allowed for %s\n", 131 __func__, rdev->desc->name); 132 return -EPERM; 133 } 134 135 if (*max_uA > rdev->constraints->max_uA) 136 *max_uA = rdev->constraints->max_uA; 137 if (*min_uA < rdev->constraints->min_uA) 138 *min_uA = rdev->constraints->min_uA; 139 140 if (*min_uA > *max_uA) 141 return -EINVAL; 142 143 return 0; 144} 145 146/* operating mode constraint check */ 147static int regulator_check_mode(struct regulator_dev *rdev, int mode) 148{ 149 switch (mode) { 150 case REGULATOR_MODE_FAST: 151 case REGULATOR_MODE_NORMAL: 152 case REGULATOR_MODE_IDLE: 153 case REGULATOR_MODE_STANDBY: 154 break; 155 default: 156 return -EINVAL; 157 } 158 159 if (!rdev->constraints) { 160 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 161 rdev->desc->name); 162 return -ENODEV; 163 } 164 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 165 printk(KERN_ERR "%s: operation not allowed for %s\n", 166 __func__, rdev->desc->name); 167 return -EPERM; 168 } 169 if (!(rdev->constraints->valid_modes_mask & mode)) { 170 printk(KERN_ERR "%s: invalid mode %x for %s\n", 171 __func__, mode, rdev->desc->name); 172 return -EINVAL; 173 } 174 return 0; 175} 176 177/* dynamic regulator mode switching constraint check */ 178static int regulator_check_drms(struct regulator_dev *rdev) 179{ 180 if (!rdev->constraints) { 181 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 182 rdev->desc->name); 183 return -ENODEV; 184 } 185 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 186 printk(KERN_ERR "%s: operation not allowed for %s\n", 187 __func__, rdev->desc->name); 188 return -EPERM; 189 } 190 return 0; 191} 192 193static ssize_t device_requested_uA_show(struct device *dev, 194 struct device_attribute *attr, char *buf) 195{ 196 struct regulator *regulator; 197 198 regulator = get_device_regulator(dev); 199 if (regulator == NULL) 200 return 0; 201 202 return sprintf(buf, "%d\n", regulator->uA_load); 203} 204 205static ssize_t regulator_uV_show(struct device *dev, 206 struct device_attribute *attr, char *buf) 207{ 208 struct regulator_dev *rdev = dev_get_drvdata(dev); 209 ssize_t ret; 210 211 mutex_lock(&rdev->mutex); 212 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 213 mutex_unlock(&rdev->mutex); 214 215 return ret; 216} 217static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 218 219static ssize_t regulator_uA_show(struct device *dev, 220 struct device_attribute *attr, char *buf) 221{ 222 struct regulator_dev *rdev = dev_get_drvdata(dev); 223 224 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 225} 226static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 227 228static ssize_t regulator_name_show(struct device *dev, 229 struct device_attribute *attr, char *buf) 230{ 231 struct regulator_dev *rdev = dev_get_drvdata(dev); 232 const char *name; 233 234 if (rdev->constraints->name) 235 name = rdev->constraints->name; 236 else if (rdev->desc->name) 237 name = rdev->desc->name; 238 else 239 name = ""; 240 241 return sprintf(buf, "%s\n", name); 242} 243 244static ssize_t regulator_print_opmode(char *buf, int mode) 245{ 246 switch (mode) { 247 case REGULATOR_MODE_FAST: 248 return sprintf(buf, "fast\n"); 249 case REGULATOR_MODE_NORMAL: 250 return sprintf(buf, "normal\n"); 251 case REGULATOR_MODE_IDLE: 252 return sprintf(buf, "idle\n"); 253 case REGULATOR_MODE_STANDBY: 254 return sprintf(buf, "standby\n"); 255 } 256 return sprintf(buf, "unknown\n"); 257} 258 259static ssize_t regulator_opmode_show(struct device *dev, 260 struct device_attribute *attr, char *buf) 261{ 262 struct regulator_dev *rdev = dev_get_drvdata(dev); 263 264 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 265} 266static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 267 268static ssize_t regulator_print_state(char *buf, int state) 269{ 270 if (state > 0) 271 return sprintf(buf, "enabled\n"); 272 else if (state == 0) 273 return sprintf(buf, "disabled\n"); 274 else 275 return sprintf(buf, "unknown\n"); 276} 277 278static ssize_t regulator_state_show(struct device *dev, 279 struct device_attribute *attr, char *buf) 280{ 281 struct regulator_dev *rdev = dev_get_drvdata(dev); 282 283 return regulator_print_state(buf, _regulator_is_enabled(rdev)); 284} 285static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 286 287static ssize_t regulator_status_show(struct device *dev, 288 struct device_attribute *attr, char *buf) 289{ 290 struct regulator_dev *rdev = dev_get_drvdata(dev); 291 int status; 292 char *label; 293 294 status = rdev->desc->ops->get_status(rdev); 295 if (status < 0) 296 return status; 297 298 switch (status) { 299 case REGULATOR_STATUS_OFF: 300 label = "off"; 301 break; 302 case REGULATOR_STATUS_ON: 303 label = "on"; 304 break; 305 case REGULATOR_STATUS_ERROR: 306 label = "error"; 307 break; 308 case REGULATOR_STATUS_FAST: 309 label = "fast"; 310 break; 311 case REGULATOR_STATUS_NORMAL: 312 label = "normal"; 313 break; 314 case REGULATOR_STATUS_IDLE: 315 label = "idle"; 316 break; 317 case REGULATOR_STATUS_STANDBY: 318 label = "standby"; 319 break; 320 default: 321 return -ERANGE; 322 } 323 324 return sprintf(buf, "%s\n", label); 325} 326static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 327 328static ssize_t regulator_min_uA_show(struct device *dev, 329 struct device_attribute *attr, char *buf) 330{ 331 struct regulator_dev *rdev = dev_get_drvdata(dev); 332 333 if (!rdev->constraints) 334 return sprintf(buf, "constraint not defined\n"); 335 336 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 337} 338static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 339 340static ssize_t regulator_max_uA_show(struct device *dev, 341 struct device_attribute *attr, char *buf) 342{ 343 struct regulator_dev *rdev = dev_get_drvdata(dev); 344 345 if (!rdev->constraints) 346 return sprintf(buf, "constraint not defined\n"); 347 348 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 349} 350static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 351 352static ssize_t regulator_min_uV_show(struct device *dev, 353 struct device_attribute *attr, char *buf) 354{ 355 struct regulator_dev *rdev = dev_get_drvdata(dev); 356 357 if (!rdev->constraints) 358 return sprintf(buf, "constraint not defined\n"); 359 360 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 361} 362static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 363 364static ssize_t regulator_max_uV_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366{ 367 struct regulator_dev *rdev = dev_get_drvdata(dev); 368 369 if (!rdev->constraints) 370 return sprintf(buf, "constraint not defined\n"); 371 372 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 373} 374static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 375 376static ssize_t regulator_total_uA_show(struct device *dev, 377 struct device_attribute *attr, char *buf) 378{ 379 struct regulator_dev *rdev = dev_get_drvdata(dev); 380 struct regulator *regulator; 381 int uA = 0; 382 383 mutex_lock(&rdev->mutex); 384 list_for_each_entry(regulator, &rdev->consumer_list, list) 385 uA += regulator->uA_load; 386 mutex_unlock(&rdev->mutex); 387 return sprintf(buf, "%d\n", uA); 388} 389static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 390 391static ssize_t regulator_num_users_show(struct device *dev, 392 struct device_attribute *attr, char *buf) 393{ 394 struct regulator_dev *rdev = dev_get_drvdata(dev); 395 return sprintf(buf, "%d\n", rdev->use_count); 396} 397 398static ssize_t regulator_type_show(struct device *dev, 399 struct device_attribute *attr, char *buf) 400{ 401 struct regulator_dev *rdev = dev_get_drvdata(dev); 402 403 switch (rdev->desc->type) { 404 case REGULATOR_VOLTAGE: 405 return sprintf(buf, "voltage\n"); 406 case REGULATOR_CURRENT: 407 return sprintf(buf, "current\n"); 408 } 409 return sprintf(buf, "unknown\n"); 410} 411 412static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 413 struct device_attribute *attr, char *buf) 414{ 415 struct regulator_dev *rdev = dev_get_drvdata(dev); 416 417 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 418} 419static DEVICE_ATTR(suspend_mem_microvolts, 0444, 420 regulator_suspend_mem_uV_show, NULL); 421 422static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 423 struct device_attribute *attr, char *buf) 424{ 425 struct regulator_dev *rdev = dev_get_drvdata(dev); 426 427 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 428} 429static DEVICE_ATTR(suspend_disk_microvolts, 0444, 430 regulator_suspend_disk_uV_show, NULL); 431 432static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 433 struct device_attribute *attr, char *buf) 434{ 435 struct regulator_dev *rdev = dev_get_drvdata(dev); 436 437 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 438} 439static DEVICE_ATTR(suspend_standby_microvolts, 0444, 440 regulator_suspend_standby_uV_show, NULL); 441 442static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 return regulator_print_opmode(buf, 448 rdev->constraints->state_mem.mode); 449} 450static DEVICE_ATTR(suspend_mem_mode, 0444, 451 regulator_suspend_mem_mode_show, NULL); 452 453static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 454 struct device_attribute *attr, char *buf) 455{ 456 struct regulator_dev *rdev = dev_get_drvdata(dev); 457 458 return regulator_print_opmode(buf, 459 rdev->constraints->state_disk.mode); 460} 461static DEVICE_ATTR(suspend_disk_mode, 0444, 462 regulator_suspend_disk_mode_show, NULL); 463 464static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 465 struct device_attribute *attr, char *buf) 466{ 467 struct regulator_dev *rdev = dev_get_drvdata(dev); 468 469 return regulator_print_opmode(buf, 470 rdev->constraints->state_standby.mode); 471} 472static DEVICE_ATTR(suspend_standby_mode, 0444, 473 regulator_suspend_standby_mode_show, NULL); 474 475static ssize_t regulator_suspend_mem_state_show(struct device *dev, 476 struct device_attribute *attr, char *buf) 477{ 478 struct regulator_dev *rdev = dev_get_drvdata(dev); 479 480 return regulator_print_state(buf, 481 rdev->constraints->state_mem.enabled); 482} 483static DEVICE_ATTR(suspend_mem_state, 0444, 484 regulator_suspend_mem_state_show, NULL); 485 486static ssize_t regulator_suspend_disk_state_show(struct device *dev, 487 struct device_attribute *attr, char *buf) 488{ 489 struct regulator_dev *rdev = dev_get_drvdata(dev); 490 491 return regulator_print_state(buf, 492 rdev->constraints->state_disk.enabled); 493} 494static DEVICE_ATTR(suspend_disk_state, 0444, 495 regulator_suspend_disk_state_show, NULL); 496 497static ssize_t regulator_suspend_standby_state_show(struct device *dev, 498 struct device_attribute *attr, char *buf) 499{ 500 struct regulator_dev *rdev = dev_get_drvdata(dev); 501 502 return regulator_print_state(buf, 503 rdev->constraints->state_standby.enabled); 504} 505static DEVICE_ATTR(suspend_standby_state, 0444, 506 regulator_suspend_standby_state_show, NULL); 507 508 509/* 510 * These are the only attributes are present for all regulators. 511 * Other attributes are a function of regulator functionality. 512 */ 513static struct device_attribute regulator_dev_attrs[] = { 514 __ATTR(name, 0444, regulator_name_show, NULL), 515 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 516 __ATTR(type, 0444, regulator_type_show, NULL), 517 __ATTR_NULL, 518}; 519 520static void regulator_dev_release(struct device *dev) 521{ 522 struct regulator_dev *rdev = dev_get_drvdata(dev); 523 kfree(rdev); 524} 525 526static struct class regulator_class = { 527 .name = "regulator", 528 .dev_release = regulator_dev_release, 529 .dev_attrs = regulator_dev_attrs, 530}; 531 532/* Calculate the new optimum regulator operating mode based on the new total 533 * consumer load. All locks held by caller */ 534static void drms_uA_update(struct regulator_dev *rdev) 535{ 536 struct regulator *sibling; 537 int current_uA = 0, output_uV, input_uV, err; 538 unsigned int mode; 539 540 err = regulator_check_drms(rdev); 541 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 542 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); 543 return; 544 545 /* get output voltage */ 546 output_uV = rdev->desc->ops->get_voltage(rdev); 547 if (output_uV <= 0) 548 return; 549 550 /* get input voltage */ 551 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 552 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 553 else 554 input_uV = rdev->constraints->input_uV; 555 if (input_uV <= 0) 556 return; 557 558 /* calc total requested load */ 559 list_for_each_entry(sibling, &rdev->consumer_list, list) 560 current_uA += sibling->uA_load; 561 562 /* now get the optimum mode for our new total regulator load */ 563 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 564 output_uV, current_uA); 565 566 /* check the new mode is allowed */ 567 err = regulator_check_mode(rdev, mode); 568 if (err == 0) 569 rdev->desc->ops->set_mode(rdev, mode); 570} 571 572static int suspend_set_state(struct regulator_dev *rdev, 573 struct regulator_state *rstate) 574{ 575 int ret = 0; 576 577 /* enable & disable are mandatory for suspend control */ 578 if (!rdev->desc->ops->set_suspend_enable || 579 !rdev->desc->ops->set_suspend_disable) { 580 printk(KERN_ERR "%s: no way to set suspend state\n", 581 __func__); 582 return -EINVAL; 583 } 584 585 if (rstate->enabled) 586 ret = rdev->desc->ops->set_suspend_enable(rdev); 587 else 588 ret = rdev->desc->ops->set_suspend_disable(rdev); 589 if (ret < 0) { 590 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 591 return ret; 592 } 593 594 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 595 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 596 if (ret < 0) { 597 printk(KERN_ERR "%s: failed to set voltage\n", 598 __func__); 599 return ret; 600 } 601 } 602 603 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 604 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 605 if (ret < 0) { 606 printk(KERN_ERR "%s: failed to set mode\n", __func__); 607 return ret; 608 } 609 } 610 return ret; 611} 612 613/* locks held by caller */ 614static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 615{ 616 if (!rdev->constraints) 617 return -EINVAL; 618 619 switch (state) { 620 case PM_SUSPEND_STANDBY: 621 return suspend_set_state(rdev, 622 &rdev->constraints->state_standby); 623 case PM_SUSPEND_MEM: 624 return suspend_set_state(rdev, 625 &rdev->constraints->state_mem); 626 case PM_SUSPEND_MAX: 627 return suspend_set_state(rdev, 628 &rdev->constraints->state_disk); 629 default: 630 return -EINVAL; 631 } 632} 633 634static void print_constraints(struct regulator_dev *rdev) 635{ 636 struct regulation_constraints *constraints = rdev->constraints; 637 char buf[80]; 638 int count; 639 640 if (rdev->desc->type == REGULATOR_VOLTAGE) { 641 if (constraints->min_uV == constraints->max_uV) 642 count = sprintf(buf, "%d mV ", 643 constraints->min_uV / 1000); 644 else 645 count = sprintf(buf, "%d <--> %d mV ", 646 constraints->min_uV / 1000, 647 constraints->max_uV / 1000); 648 } else { 649 if (constraints->min_uA == constraints->max_uA) 650 count = sprintf(buf, "%d mA ", 651 constraints->min_uA / 1000); 652 else 653 count = sprintf(buf, "%d <--> %d mA ", 654 constraints->min_uA / 1000, 655 constraints->max_uA / 1000); 656 } 657 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 658 count += sprintf(buf + count, "fast "); 659 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 660 count += sprintf(buf + count, "normal "); 661 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 662 count += sprintf(buf + count, "idle "); 663 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 664 count += sprintf(buf + count, "standby"); 665 666 printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf); 667} 668 669/** 670 * set_machine_constraints - sets regulator constraints 671 * @rdev: regulator source 672 * @constraints: constraints to apply 673 * 674 * Allows platform initialisation code to define and constrain 675 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 676 * Constraints *must* be set by platform code in order for some 677 * regulator operations to proceed i.e. set_voltage, set_current_limit, 678 * set_mode. 679 */ 680static int set_machine_constraints(struct regulator_dev *rdev, 681 struct regulation_constraints *constraints) 682{ 683 int ret = 0; 684 const char *name; 685 struct regulator_ops *ops = rdev->desc->ops; 686 687 if (constraints->name) 688 name = constraints->name; 689 else if (rdev->desc->name) 690 name = rdev->desc->name; 691 else 692 name = "regulator"; 693 694 /* constrain machine-level voltage specs to fit 695 * the actual range supported by this regulator. 696 */ 697 if (ops->list_voltage && rdev->desc->n_voltages) { 698 int count = rdev->desc->n_voltages; 699 int i; 700 int min_uV = INT_MAX; 701 int max_uV = INT_MIN; 702 int cmin = constraints->min_uV; 703 int cmax = constraints->max_uV; 704 705 /* it's safe to autoconfigure fixed-voltage supplies */ 706 if (count == 1 && !cmin) { 707 cmin = INT_MIN; 708 cmax = INT_MAX; 709 } 710 711 /* voltage constraints are optional */ 712 if ((cmin == 0) && (cmax == 0)) 713 goto out; 714 715 /* else require explicit machine-level constraints */ 716 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 717 pr_err("%s: %s '%s' voltage constraints\n", 718 __func__, "invalid", name); 719 ret = -EINVAL; 720 goto out; 721 } 722 723 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 724 for (i = 0; i < count; i++) { 725 int value; 726 727 value = ops->list_voltage(rdev, i); 728 if (value <= 0) 729 continue; 730 731 /* maybe adjust [min_uV..max_uV] */ 732 if (value >= cmin && value < min_uV) 733 min_uV = value; 734 if (value <= cmax && value > max_uV) 735 max_uV = value; 736 } 737 738 /* final: [min_uV..max_uV] valid iff constraints valid */ 739 if (max_uV < min_uV) { 740 pr_err("%s: %s '%s' voltage constraints\n", 741 __func__, "unsupportable", name); 742 ret = -EINVAL; 743 goto out; 744 } 745 746 /* use regulator's subset of machine constraints */ 747 if (constraints->min_uV < min_uV) { 748 pr_debug("%s: override '%s' %s, %d -> %d\n", 749 __func__, name, "min_uV", 750 constraints->min_uV, min_uV); 751 constraints->min_uV = min_uV; 752 } 753 if (constraints->max_uV > max_uV) { 754 pr_debug("%s: override '%s' %s, %d -> %d\n", 755 __func__, name, "max_uV", 756 constraints->max_uV, max_uV); 757 constraints->max_uV = max_uV; 758 } 759 } 760 761 rdev->constraints = constraints; 762 763 /* do we need to apply the constraint voltage */ 764 if (rdev->constraints->apply_uV && 765 rdev->constraints->min_uV == rdev->constraints->max_uV && 766 ops->set_voltage) { 767 ret = ops->set_voltage(rdev, 768 rdev->constraints->min_uV, rdev->constraints->max_uV); 769 if (ret < 0) { 770 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 771 __func__, 772 rdev->constraints->min_uV, name); 773 rdev->constraints = NULL; 774 goto out; 775 } 776 } 777 778 /* do we need to setup our suspend state */ 779 if (constraints->initial_state) { 780 ret = suspend_prepare(rdev, constraints->initial_state); 781 if (ret < 0) { 782 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 783 __func__, name); 784 rdev->constraints = NULL; 785 goto out; 786 } 787 } 788 789 if (constraints->initial_mode) { 790 if (!ops->set_mode) { 791 printk(KERN_ERR "%s: no set_mode operation for %s\n", 792 __func__, name); 793 ret = -EINVAL; 794 goto out; 795 } 796 797 ret = ops->set_mode(rdev, constraints->initial_mode); 798 if (ret < 0) { 799 printk(KERN_ERR 800 "%s: failed to set initial mode for %s: %d\n", 801 __func__, name, ret); 802 goto out; 803 } 804 } 805 806 /* If the constraints say the regulator should be on at this point 807 * and we have control then make sure it is enabled. 808 */ 809 if ((constraints->always_on || constraints->boot_on) && ops->enable) { 810 ret = ops->enable(rdev); 811 if (ret < 0) { 812 printk(KERN_ERR "%s: failed to enable %s\n", 813 __func__, name); 814 rdev->constraints = NULL; 815 goto out; 816 } 817 } 818 819 print_constraints(rdev); 820out: 821 return ret; 822} 823 824/** 825 * set_supply - set regulator supply regulator 826 * @rdev: regulator name 827 * @supply_rdev: supply regulator name 828 * 829 * Called by platform initialisation code to set the supply regulator for this 830 * regulator. This ensures that a regulators supply will also be enabled by the 831 * core if it's child is enabled. 832 */ 833static int set_supply(struct regulator_dev *rdev, 834 struct regulator_dev *supply_rdev) 835{ 836 int err; 837 838 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 839 "supply"); 840 if (err) { 841 printk(KERN_ERR 842 "%s: could not add device link %s err %d\n", 843 __func__, supply_rdev->dev.kobj.name, err); 844 goto out; 845 } 846 rdev->supply = supply_rdev; 847 list_add(&rdev->slist, &supply_rdev->supply_list); 848out: 849 return err; 850} 851 852/** 853 * set_consumer_device_supply: Bind a regulator to a symbolic supply 854 * @rdev: regulator source 855 * @consumer_dev: device the supply applies to 856 * @supply: symbolic name for supply 857 * 858 * Allows platform initialisation code to map physical regulator 859 * sources to symbolic names for supplies for use by devices. Devices 860 * should use these symbolic names to request regulators, avoiding the 861 * need to provide board-specific regulator names as platform data. 862 */ 863static int set_consumer_device_supply(struct regulator_dev *rdev, 864 struct device *consumer_dev, const char *supply) 865{ 866 struct regulator_map *node; 867 868 if (supply == NULL) 869 return -EINVAL; 870 871 list_for_each_entry(node, ®ulator_map_list, list) { 872 if (consumer_dev != node->dev) 873 continue; 874 if (strcmp(node->supply, supply) != 0) 875 continue; 876 877 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 878 dev_name(&node->regulator->dev), 879 node->regulator->desc->name, 880 supply, 881 dev_name(&rdev->dev), rdev->desc->name); 882 return -EBUSY; 883 } 884 885 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); 886 if (node == NULL) 887 return -ENOMEM; 888 889 node->regulator = rdev; 890 node->dev = consumer_dev; 891 node->supply = supply; 892 893 list_add(&node->list, ®ulator_map_list); 894 return 0; 895} 896 897static void unset_consumer_device_supply(struct regulator_dev *rdev, 898 struct device *consumer_dev) 899{ 900 struct regulator_map *node, *n; 901 902 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 903 if (rdev == node->regulator && 904 consumer_dev == node->dev) { 905 list_del(&node->list); 906 kfree(node); 907 return; 908 } 909 } 910} 911 912static void unset_regulator_supplies(struct regulator_dev *rdev) 913{ 914 struct regulator_map *node, *n; 915 916 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 917 if (rdev == node->regulator) { 918 list_del(&node->list); 919 kfree(node); 920 return; 921 } 922 } 923} 924 925#define REG_STR_SIZE 32 926 927static struct regulator *create_regulator(struct regulator_dev *rdev, 928 struct device *dev, 929 const char *supply_name) 930{ 931 struct regulator *regulator; 932 char buf[REG_STR_SIZE]; 933 int err, size; 934 935 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 936 if (regulator == NULL) 937 return NULL; 938 939 mutex_lock(&rdev->mutex); 940 regulator->rdev = rdev; 941 list_add(®ulator->list, &rdev->consumer_list); 942 943 if (dev) { 944 /* create a 'requested_microamps_name' sysfs entry */ 945 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 946 supply_name); 947 if (size >= REG_STR_SIZE) 948 goto overflow_err; 949 950 regulator->dev = dev; 951 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 952 if (regulator->dev_attr.attr.name == NULL) 953 goto attr_name_err; 954 955 regulator->dev_attr.attr.owner = THIS_MODULE; 956 regulator->dev_attr.attr.mode = 0444; 957 regulator->dev_attr.show = device_requested_uA_show; 958 err = device_create_file(dev, ®ulator->dev_attr); 959 if (err < 0) { 960 printk(KERN_WARNING "%s: could not add regulator_dev" 961 " load sysfs\n", __func__); 962 goto attr_name_err; 963 } 964 965 /* also add a link to the device sysfs entry */ 966 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 967 dev->kobj.name, supply_name); 968 if (size >= REG_STR_SIZE) 969 goto attr_err; 970 971 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 972 if (regulator->supply_name == NULL) 973 goto attr_err; 974 975 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 976 buf); 977 if (err) { 978 printk(KERN_WARNING 979 "%s: could not add device link %s err %d\n", 980 __func__, dev->kobj.name, err); 981 device_remove_file(dev, ®ulator->dev_attr); 982 goto link_name_err; 983 } 984 } 985 mutex_unlock(&rdev->mutex); 986 return regulator; 987link_name_err: 988 kfree(regulator->supply_name); 989attr_err: 990 device_remove_file(regulator->dev, ®ulator->dev_attr); 991attr_name_err: 992 kfree(regulator->dev_attr.attr.name); 993overflow_err: 994 list_del(®ulator->list); 995 kfree(regulator); 996 mutex_unlock(&rdev->mutex); 997 return NULL; 998} 999 1000/** 1001 * regulator_get - lookup and obtain a reference to a regulator. 1002 * @dev: device for regulator "consumer" 1003 * @id: Supply name or regulator ID. 1004 * 1005 * Returns a struct regulator corresponding to the regulator producer, 1006 * or IS_ERR() condition containing errno. 1007 * 1008 * Use of supply names configured via regulator_set_device_supply() is 1009 * strongly encouraged. It is recommended that the supply name used 1010 * should match the name used for the supply and/or the relevant 1011 * device pins in the datasheet. 1012 */ 1013struct regulator *regulator_get(struct device *dev, const char *id) 1014{ 1015 struct regulator_dev *rdev; 1016 struct regulator_map *map; 1017 struct regulator *regulator = ERR_PTR(-ENODEV); 1018 1019 if (id == NULL) { 1020 printk(KERN_ERR "regulator: get() with no identifier\n"); 1021 return regulator; 1022 } 1023 1024 mutex_lock(®ulator_list_mutex); 1025 1026 list_for_each_entry(map, ®ulator_map_list, list) { 1027 if (dev == map->dev && 1028 strcmp(map->supply, id) == 0) { 1029 rdev = map->regulator; 1030 goto found; 1031 } 1032 } 1033 mutex_unlock(®ulator_list_mutex); 1034 return regulator; 1035 1036found: 1037 if (!try_module_get(rdev->owner)) 1038 goto out; 1039 1040 regulator = create_regulator(rdev, dev, id); 1041 if (regulator == NULL) { 1042 regulator = ERR_PTR(-ENOMEM); 1043 module_put(rdev->owner); 1044 } 1045 1046out: 1047 mutex_unlock(®ulator_list_mutex); 1048 return regulator; 1049} 1050EXPORT_SYMBOL_GPL(regulator_get); 1051 1052/** 1053 * regulator_put - "free" the regulator source 1054 * @regulator: regulator source 1055 * 1056 * Note: drivers must ensure that all regulator_enable calls made on this 1057 * regulator source are balanced by regulator_disable calls prior to calling 1058 * this function. 1059 */ 1060void regulator_put(struct regulator *regulator) 1061{ 1062 struct regulator_dev *rdev; 1063 1064 if (regulator == NULL || IS_ERR(regulator)) 1065 return; 1066 1067 mutex_lock(®ulator_list_mutex); 1068 rdev = regulator->rdev; 1069 1070 /* remove any sysfs entries */ 1071 if (regulator->dev) { 1072 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1073 kfree(regulator->supply_name); 1074 device_remove_file(regulator->dev, ®ulator->dev_attr); 1075 kfree(regulator->dev_attr.attr.name); 1076 } 1077 list_del(®ulator->list); 1078 kfree(regulator); 1079 1080 module_put(rdev->owner); 1081 mutex_unlock(®ulator_list_mutex); 1082} 1083EXPORT_SYMBOL_GPL(regulator_put); 1084 1085/* locks held by regulator_enable() */ 1086static int _regulator_enable(struct regulator_dev *rdev) 1087{ 1088 int ret = -EINVAL; 1089 1090 if (!rdev->constraints) { 1091 printk(KERN_ERR "%s: %s has no constraints\n", 1092 __func__, rdev->desc->name); 1093 return ret; 1094 } 1095 1096 /* do we need to enable the supply regulator first */ 1097 if (rdev->supply) { 1098 ret = _regulator_enable(rdev->supply); 1099 if (ret < 0) { 1100 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1101 __func__, rdev->desc->name, ret); 1102 return ret; 1103 } 1104 } 1105 1106 /* check voltage and requested load before enabling */ 1107 if (rdev->desc->ops->enable) { 1108 1109 if (rdev->constraints && 1110 (rdev->constraints->valid_ops_mask & 1111 REGULATOR_CHANGE_DRMS)) 1112 drms_uA_update(rdev); 1113 1114 ret = rdev->desc->ops->enable(rdev); 1115 if (ret < 0) { 1116 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1117 __func__, rdev->desc->name, ret); 1118 return ret; 1119 } 1120 rdev->use_count++; 1121 return ret; 1122 } 1123 1124 return ret; 1125} 1126 1127/** 1128 * regulator_enable - enable regulator output 1129 * @regulator: regulator source 1130 * 1131 * Request that the regulator be enabled with the regulator output at 1132 * the predefined voltage or current value. Calls to regulator_enable() 1133 * must be balanced with calls to regulator_disable(). 1134 * 1135 * NOTE: the output value can be set by other drivers, boot loader or may be 1136 * hardwired in the regulator. 1137 */ 1138int regulator_enable(struct regulator *regulator) 1139{ 1140 struct regulator_dev *rdev = regulator->rdev; 1141 int ret = 0; 1142 1143 mutex_lock(&rdev->mutex); 1144 ret = _regulator_enable(rdev); 1145 mutex_unlock(&rdev->mutex); 1146 return ret; 1147} 1148EXPORT_SYMBOL_GPL(regulator_enable); 1149 1150/* locks held by regulator_disable() */ 1151static int _regulator_disable(struct regulator_dev *rdev) 1152{ 1153 int ret = 0; 1154 1155 if (WARN(rdev->use_count <= 0, 1156 "unbalanced disables for %s\n", 1157 rdev->desc->name)) 1158 return -EIO; 1159 1160 /* are we the last user and permitted to disable ? */ 1161 if (rdev->use_count == 1 && !rdev->constraints->always_on) { 1162 1163 /* we are last user */ 1164 if (rdev->desc->ops->disable) { 1165 ret = rdev->desc->ops->disable(rdev); 1166 if (ret < 0) { 1167 printk(KERN_ERR "%s: failed to disable %s\n", 1168 __func__, rdev->desc->name); 1169 return ret; 1170 } 1171 } 1172 1173 /* decrease our supplies ref count and disable if required */ 1174 if (rdev->supply) 1175 _regulator_disable(rdev->supply); 1176 1177 rdev->use_count = 0; 1178 } else if (rdev->use_count > 1) { 1179 1180 if (rdev->constraints && 1181 (rdev->constraints->valid_ops_mask & 1182 REGULATOR_CHANGE_DRMS)) 1183 drms_uA_update(rdev); 1184 1185 rdev->use_count--; 1186 } 1187 return ret; 1188} 1189 1190/** 1191 * regulator_disable - disable regulator output 1192 * @regulator: regulator source 1193 * 1194 * Disable the regulator output voltage or current. Calls to 1195 * regulator_enable() must be balanced with calls to 1196 * regulator_disable(). 1197 * 1198 * NOTE: this will only disable the regulator output if no other consumer 1199 * devices have it enabled, the regulator device supports disabling and 1200 * machine constraints permit this operation. 1201 */ 1202int regulator_disable(struct regulator *regulator) 1203{ 1204 struct regulator_dev *rdev = regulator->rdev; 1205 int ret = 0; 1206 1207 mutex_lock(&rdev->mutex); 1208 ret = _regulator_disable(rdev); 1209 mutex_unlock(&rdev->mutex); 1210 return ret; 1211} 1212EXPORT_SYMBOL_GPL(regulator_disable); 1213 1214/* locks held by regulator_force_disable() */ 1215static int _regulator_force_disable(struct regulator_dev *rdev) 1216{ 1217 int ret = 0; 1218 1219 /* force disable */ 1220 if (rdev->desc->ops->disable) { 1221 /* ah well, who wants to live forever... */ 1222 ret = rdev->desc->ops->disable(rdev); 1223 if (ret < 0) { 1224 printk(KERN_ERR "%s: failed to force disable %s\n", 1225 __func__, rdev->desc->name); 1226 return ret; 1227 } 1228 /* notify other consumers that power has been forced off */ 1229 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, 1230 NULL); 1231 } 1232 1233 /* decrease our supplies ref count and disable if required */ 1234 if (rdev->supply) 1235 _regulator_disable(rdev->supply); 1236 1237 rdev->use_count = 0; 1238 return ret; 1239} 1240 1241/** 1242 * regulator_force_disable - force disable regulator output 1243 * @regulator: regulator source 1244 * 1245 * Forcibly disable the regulator output voltage or current. 1246 * NOTE: this *will* disable the regulator output even if other consumer 1247 * devices have it enabled. This should be used for situations when device 1248 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1249 */ 1250int regulator_force_disable(struct regulator *regulator) 1251{ 1252 int ret; 1253 1254 mutex_lock(®ulator->rdev->mutex); 1255 regulator->uA_load = 0; 1256 ret = _regulator_force_disable(regulator->rdev); 1257 mutex_unlock(®ulator->rdev->mutex); 1258 return ret; 1259} 1260EXPORT_SYMBOL_GPL(regulator_force_disable); 1261 1262static int _regulator_is_enabled(struct regulator_dev *rdev) 1263{ 1264 int ret; 1265 1266 mutex_lock(&rdev->mutex); 1267 1268 /* sanity check */ 1269 if (!rdev->desc->ops->is_enabled) { 1270 ret = -EINVAL; 1271 goto out; 1272 } 1273 1274 ret = rdev->desc->ops->is_enabled(rdev); 1275out: 1276 mutex_unlock(&rdev->mutex); 1277 return ret; 1278} 1279 1280/** 1281 * regulator_is_enabled - is the regulator output enabled 1282 * @regulator: regulator source 1283 * 1284 * Returns positive if the regulator driver backing the source/client 1285 * has requested that the device be enabled, zero if it hasn't, else a 1286 * negative errno code. 1287 * 1288 * Note that the device backing this regulator handle can have multiple 1289 * users, so it might be enabled even if regulator_enable() was never 1290 * called for this particular source. 1291 */ 1292int regulator_is_enabled(struct regulator *regulator) 1293{ 1294 return _regulator_is_enabled(regulator->rdev); 1295} 1296EXPORT_SYMBOL_GPL(regulator_is_enabled); 1297 1298/** 1299 * regulator_count_voltages - count regulator_list_voltage() selectors 1300 * @regulator: regulator source 1301 * 1302 * Returns number of selectors, or negative errno. Selectors are 1303 * numbered starting at zero, and typically correspond to bitfields 1304 * in hardware registers. 1305 */ 1306int regulator_count_voltages(struct regulator *regulator) 1307{ 1308 struct regulator_dev *rdev = regulator->rdev; 1309 1310 return rdev->desc->n_voltages ? : -EINVAL; 1311} 1312EXPORT_SYMBOL_GPL(regulator_count_voltages); 1313 1314/** 1315 * regulator_list_voltage - enumerate supported voltages 1316 * @regulator: regulator source 1317 * @selector: identify voltage to list 1318 * Context: can sleep 1319 * 1320 * Returns a voltage that can be passed to @regulator_set_voltage(), 1321 * zero if this selector code can't be used on this sytem, or a 1322 * negative errno. 1323 */ 1324int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1325{ 1326 struct regulator_dev *rdev = regulator->rdev; 1327 struct regulator_ops *ops = rdev->desc->ops; 1328 int ret; 1329 1330 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1331 return -EINVAL; 1332 1333 mutex_lock(&rdev->mutex); 1334 ret = ops->list_voltage(rdev, selector); 1335 mutex_unlock(&rdev->mutex); 1336 1337 if (ret > 0) { 1338 if (ret < rdev->constraints->min_uV) 1339 ret = 0; 1340 else if (ret > rdev->constraints->max_uV) 1341 ret = 0; 1342 } 1343 1344 return ret; 1345} 1346EXPORT_SYMBOL_GPL(regulator_list_voltage); 1347 1348/** 1349 * regulator_set_voltage - set regulator output voltage 1350 * @regulator: regulator source 1351 * @min_uV: Minimum required voltage in uV 1352 * @max_uV: Maximum acceptable voltage in uV 1353 * 1354 * Sets a voltage regulator to the desired output voltage. This can be set 1355 * during any regulator state. IOW, regulator can be disabled or enabled. 1356 * 1357 * If the regulator is enabled then the voltage will change to the new value 1358 * immediately otherwise if the regulator is disabled the regulator will 1359 * output at the new voltage when enabled. 1360 * 1361 * NOTE: If the regulator is shared between several devices then the lowest 1362 * request voltage that meets the system constraints will be used. 1363 * Regulator system constraints must be set for this regulator before 1364 * calling this function otherwise this call will fail. 1365 */ 1366int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1367{ 1368 struct regulator_dev *rdev = regulator->rdev; 1369 int ret; 1370 1371 mutex_lock(&rdev->mutex); 1372 1373 /* sanity check */ 1374 if (!rdev->desc->ops->set_voltage) { 1375 ret = -EINVAL; 1376 goto out; 1377 } 1378 1379 /* constraints check */ 1380 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1381 if (ret < 0) 1382 goto out; 1383 regulator->min_uV = min_uV; 1384 regulator->max_uV = max_uV; 1385 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1386 1387out: 1388 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1389 mutex_unlock(&rdev->mutex); 1390 return ret; 1391} 1392EXPORT_SYMBOL_GPL(regulator_set_voltage); 1393 1394static int _regulator_get_voltage(struct regulator_dev *rdev) 1395{ 1396 /* sanity check */ 1397 if (rdev->desc->ops->get_voltage) 1398 return rdev->desc->ops->get_voltage(rdev); 1399 else 1400 return -EINVAL; 1401} 1402 1403/** 1404 * regulator_get_voltage - get regulator output voltage 1405 * @regulator: regulator source 1406 * 1407 * This returns the current regulator voltage in uV. 1408 * 1409 * NOTE: If the regulator is disabled it will return the voltage value. This 1410 * function should not be used to determine regulator state. 1411 */ 1412int regulator_get_voltage(struct regulator *regulator) 1413{ 1414 int ret; 1415 1416 mutex_lock(®ulator->rdev->mutex); 1417 1418 ret = _regulator_get_voltage(regulator->rdev); 1419 1420 mutex_unlock(®ulator->rdev->mutex); 1421 1422 return ret; 1423} 1424EXPORT_SYMBOL_GPL(regulator_get_voltage); 1425 1426/** 1427 * regulator_set_current_limit - set regulator output current limit 1428 * @regulator: regulator source 1429 * @min_uA: Minimuum supported current in uA 1430 * @max_uA: Maximum supported current in uA 1431 * 1432 * Sets current sink to the desired output current. This can be set during 1433 * any regulator state. IOW, regulator can be disabled or enabled. 1434 * 1435 * If the regulator is enabled then the current will change to the new value 1436 * immediately otherwise if the regulator is disabled the regulator will 1437 * output at the new current when enabled. 1438 * 1439 * NOTE: Regulator system constraints must be set for this regulator before 1440 * calling this function otherwise this call will fail. 1441 */ 1442int regulator_set_current_limit(struct regulator *regulator, 1443 int min_uA, int max_uA) 1444{ 1445 struct regulator_dev *rdev = regulator->rdev; 1446 int ret; 1447 1448 mutex_lock(&rdev->mutex); 1449 1450 /* sanity check */ 1451 if (!rdev->desc->ops->set_current_limit) { 1452 ret = -EINVAL; 1453 goto out; 1454 } 1455 1456 /* constraints check */ 1457 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1458 if (ret < 0) 1459 goto out; 1460 1461 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1462out: 1463 mutex_unlock(&rdev->mutex); 1464 return ret; 1465} 1466EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1467 1468static int _regulator_get_current_limit(struct regulator_dev *rdev) 1469{ 1470 int ret; 1471 1472 mutex_lock(&rdev->mutex); 1473 1474 /* sanity check */ 1475 if (!rdev->desc->ops->get_current_limit) { 1476 ret = -EINVAL; 1477 goto out; 1478 } 1479 1480 ret = rdev->desc->ops->get_current_limit(rdev); 1481out: 1482 mutex_unlock(&rdev->mutex); 1483 return ret; 1484} 1485 1486/** 1487 * regulator_get_current_limit - get regulator output current 1488 * @regulator: regulator source 1489 * 1490 * This returns the current supplied by the specified current sink in uA. 1491 * 1492 * NOTE: If the regulator is disabled it will return the current value. This 1493 * function should not be used to determine regulator state. 1494 */ 1495int regulator_get_current_limit(struct regulator *regulator) 1496{ 1497 return _regulator_get_current_limit(regulator->rdev); 1498} 1499EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1500 1501/** 1502 * regulator_set_mode - set regulator operating mode 1503 * @regulator: regulator source 1504 * @mode: operating mode - one of the REGULATOR_MODE constants 1505 * 1506 * Set regulator operating mode to increase regulator efficiency or improve 1507 * regulation performance. 1508 * 1509 * NOTE: Regulator system constraints must be set for this regulator before 1510 * calling this function otherwise this call will fail. 1511 */ 1512int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1513{ 1514 struct regulator_dev *rdev = regulator->rdev; 1515 int ret; 1516 1517 mutex_lock(&rdev->mutex); 1518 1519 /* sanity check */ 1520 if (!rdev->desc->ops->set_mode) { 1521 ret = -EINVAL; 1522 goto out; 1523 } 1524 1525 /* constraints check */ 1526 ret = regulator_check_mode(rdev, mode); 1527 if (ret < 0) 1528 goto out; 1529 1530 ret = rdev->desc->ops->set_mode(rdev, mode); 1531out: 1532 mutex_unlock(&rdev->mutex); 1533 return ret; 1534} 1535EXPORT_SYMBOL_GPL(regulator_set_mode); 1536 1537static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1538{ 1539 int ret; 1540 1541 mutex_lock(&rdev->mutex); 1542 1543 /* sanity check */ 1544 if (!rdev->desc->ops->get_mode) { 1545 ret = -EINVAL; 1546 goto out; 1547 } 1548 1549 ret = rdev->desc->ops->get_mode(rdev); 1550out: 1551 mutex_unlock(&rdev->mutex); 1552 return ret; 1553} 1554 1555/** 1556 * regulator_get_mode - get regulator operating mode 1557 * @regulator: regulator source 1558 * 1559 * Get the current regulator operating mode. 1560 */ 1561unsigned int regulator_get_mode(struct regulator *regulator) 1562{ 1563 return _regulator_get_mode(regulator->rdev); 1564} 1565EXPORT_SYMBOL_GPL(regulator_get_mode); 1566 1567/** 1568 * regulator_set_optimum_mode - set regulator optimum operating mode 1569 * @regulator: regulator source 1570 * @uA_load: load current 1571 * 1572 * Notifies the regulator core of a new device load. This is then used by 1573 * DRMS (if enabled by constraints) to set the most efficient regulator 1574 * operating mode for the new regulator loading. 1575 * 1576 * Consumer devices notify their supply regulator of the maximum power 1577 * they will require (can be taken from device datasheet in the power 1578 * consumption tables) when they change operational status and hence power 1579 * state. Examples of operational state changes that can affect power 1580 * consumption are :- 1581 * 1582 * o Device is opened / closed. 1583 * o Device I/O is about to begin or has just finished. 1584 * o Device is idling in between work. 1585 * 1586 * This information is also exported via sysfs to userspace. 1587 * 1588 * DRMS will sum the total requested load on the regulator and change 1589 * to the most efficient operating mode if platform constraints allow. 1590 * 1591 * Returns the new regulator mode or error. 1592 */ 1593int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1594{ 1595 struct regulator_dev *rdev = regulator->rdev; 1596 struct regulator *consumer; 1597 int ret, output_uV, input_uV, total_uA_load = 0; 1598 unsigned int mode; 1599 1600 mutex_lock(&rdev->mutex); 1601 1602 regulator->uA_load = uA_load; 1603 ret = regulator_check_drms(rdev); 1604 if (ret < 0) 1605 goto out; 1606 ret = -EINVAL; 1607 1608 /* sanity check */ 1609 if (!rdev->desc->ops->get_optimum_mode) 1610 goto out; 1611 1612 /* get output voltage */ 1613 output_uV = rdev->desc->ops->get_voltage(rdev); 1614 if (output_uV <= 0) { 1615 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1616 __func__, rdev->desc->name); 1617 goto out; 1618 } 1619 1620 /* get input voltage */ 1621 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1622 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1623 else 1624 input_uV = rdev->constraints->input_uV; 1625 if (input_uV <= 0) { 1626 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1627 __func__, rdev->desc->name); 1628 goto out; 1629 } 1630 1631 /* calc total requested load for this regulator */ 1632 list_for_each_entry(consumer, &rdev->consumer_list, list) 1633 total_uA_load += consumer->uA_load; 1634 1635 mode = rdev->desc->ops->get_optimum_mode(rdev, 1636 input_uV, output_uV, 1637 total_uA_load); 1638 ret = regulator_check_mode(rdev, mode); 1639 if (ret < 0) { 1640 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1641 " %d uA %d -> %d uV\n", __func__, rdev->desc->name, 1642 total_uA_load, input_uV, output_uV); 1643 goto out; 1644 } 1645 1646 ret = rdev->desc->ops->set_mode(rdev, mode); 1647 if (ret < 0) { 1648 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1649 __func__, mode, rdev->desc->name); 1650 goto out; 1651 } 1652 ret = mode; 1653out: 1654 mutex_unlock(&rdev->mutex); 1655 return ret; 1656} 1657EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1658 1659/** 1660 * regulator_register_notifier - register regulator event notifier 1661 * @regulator: regulator source 1662 * @nb: notifier block 1663 * 1664 * Register notifier block to receive regulator events. 1665 */ 1666int regulator_register_notifier(struct regulator *regulator, 1667 struct notifier_block *nb) 1668{ 1669 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1670 nb); 1671} 1672EXPORT_SYMBOL_GPL(regulator_register_notifier); 1673 1674/** 1675 * regulator_unregister_notifier - unregister regulator event notifier 1676 * @regulator: regulator source 1677 * @nb: notifier block 1678 * 1679 * Unregister regulator event notifier block. 1680 */ 1681int regulator_unregister_notifier(struct regulator *regulator, 1682 struct notifier_block *nb) 1683{ 1684 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1685 nb); 1686} 1687EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1688 1689/* notify regulator consumers and downstream regulator consumers. 1690 * Note mutex must be held by caller. 1691 */ 1692static void _notifier_call_chain(struct regulator_dev *rdev, 1693 unsigned long event, void *data) 1694{ 1695 struct regulator_dev *_rdev; 1696 1697 /* call rdev chain first */ 1698 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1699 1700 /* now notify regulator we supply */ 1701 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1702 mutex_lock(&_rdev->mutex); 1703 _notifier_call_chain(_rdev, event, data); 1704 mutex_unlock(&_rdev->mutex); 1705 } 1706} 1707 1708/** 1709 * regulator_bulk_get - get multiple regulator consumers 1710 * 1711 * @dev: Device to supply 1712 * @num_consumers: Number of consumers to register 1713 * @consumers: Configuration of consumers; clients are stored here. 1714 * 1715 * @return 0 on success, an errno on failure. 1716 * 1717 * This helper function allows drivers to get several regulator 1718 * consumers in one operation. If any of the regulators cannot be 1719 * acquired then any regulators that were allocated will be freed 1720 * before returning to the caller. 1721 */ 1722int regulator_bulk_get(struct device *dev, int num_consumers, 1723 struct regulator_bulk_data *consumers) 1724{ 1725 int i; 1726 int ret; 1727 1728 for (i = 0; i < num_consumers; i++) 1729 consumers[i].consumer = NULL; 1730 1731 for (i = 0; i < num_consumers; i++) { 1732 consumers[i].consumer = regulator_get(dev, 1733 consumers[i].supply); 1734 if (IS_ERR(consumers[i].consumer)) { 1735 dev_err(dev, "Failed to get supply '%s'\n", 1736 consumers[i].supply); 1737 ret = PTR_ERR(consumers[i].consumer); 1738 consumers[i].consumer = NULL; 1739 goto err; 1740 } 1741 } 1742 1743 return 0; 1744 1745err: 1746 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1747 regulator_put(consumers[i].consumer); 1748 1749 return ret; 1750} 1751EXPORT_SYMBOL_GPL(regulator_bulk_get); 1752 1753/** 1754 * regulator_bulk_enable - enable multiple regulator consumers 1755 * 1756 * @num_consumers: Number of consumers 1757 * @consumers: Consumer data; clients are stored here. 1758 * @return 0 on success, an errno on failure 1759 * 1760 * This convenience API allows consumers to enable multiple regulator 1761 * clients in a single API call. If any consumers cannot be enabled 1762 * then any others that were enabled will be disabled again prior to 1763 * return. 1764 */ 1765int regulator_bulk_enable(int num_consumers, 1766 struct regulator_bulk_data *consumers) 1767{ 1768 int i; 1769 int ret; 1770 1771 for (i = 0; i < num_consumers; i++) { 1772 ret = regulator_enable(consumers[i].consumer); 1773 if (ret != 0) 1774 goto err; 1775 } 1776 1777 return 0; 1778 1779err: 1780 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); 1781 for (i = 0; i < num_consumers; i++) 1782 regulator_disable(consumers[i].consumer); 1783 1784 return ret; 1785} 1786EXPORT_SYMBOL_GPL(regulator_bulk_enable); 1787 1788/** 1789 * regulator_bulk_disable - disable multiple regulator consumers 1790 * 1791 * @num_consumers: Number of consumers 1792 * @consumers: Consumer data; clients are stored here. 1793 * @return 0 on success, an errno on failure 1794 * 1795 * This convenience API allows consumers to disable multiple regulator 1796 * clients in a single API call. If any consumers cannot be enabled 1797 * then any others that were disabled will be disabled again prior to 1798 * return. 1799 */ 1800int regulator_bulk_disable(int num_consumers, 1801 struct regulator_bulk_data *consumers) 1802{ 1803 int i; 1804 int ret; 1805 1806 for (i = 0; i < num_consumers; i++) { 1807 ret = regulator_disable(consumers[i].consumer); 1808 if (ret != 0) 1809 goto err; 1810 } 1811 1812 return 0; 1813 1814err: 1815 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); 1816 for (i = 0; i < num_consumers; i++) 1817 regulator_enable(consumers[i].consumer); 1818 1819 return ret; 1820} 1821EXPORT_SYMBOL_GPL(regulator_bulk_disable); 1822 1823/** 1824 * regulator_bulk_free - free multiple regulator consumers 1825 * 1826 * @num_consumers: Number of consumers 1827 * @consumers: Consumer data; clients are stored here. 1828 * 1829 * This convenience API allows consumers to free multiple regulator 1830 * clients in a single API call. 1831 */ 1832void regulator_bulk_free(int num_consumers, 1833 struct regulator_bulk_data *consumers) 1834{ 1835 int i; 1836 1837 for (i = 0; i < num_consumers; i++) { 1838 regulator_put(consumers[i].consumer); 1839 consumers[i].consumer = NULL; 1840 } 1841} 1842EXPORT_SYMBOL_GPL(regulator_bulk_free); 1843 1844/** 1845 * regulator_notifier_call_chain - call regulator event notifier 1846 * @rdev: regulator source 1847 * @event: notifier block 1848 * @data: callback-specific data. 1849 * 1850 * Called by regulator drivers to notify clients a regulator event has 1851 * occurred. We also notify regulator clients downstream. 1852 * Note lock must be held by caller. 1853 */ 1854int regulator_notifier_call_chain(struct regulator_dev *rdev, 1855 unsigned long event, void *data) 1856{ 1857 _notifier_call_chain(rdev, event, data); 1858 return NOTIFY_DONE; 1859 1860} 1861EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 1862 1863/* 1864 * To avoid cluttering sysfs (and memory) with useless state, only 1865 * create attributes that can be meaningfully displayed. 1866 */ 1867static int add_regulator_attributes(struct regulator_dev *rdev) 1868{ 1869 struct device *dev = &rdev->dev; 1870 struct regulator_ops *ops = rdev->desc->ops; 1871 int status = 0; 1872 1873 /* some attributes need specific methods to be displayed */ 1874 if (ops->get_voltage) { 1875 status = device_create_file(dev, &dev_attr_microvolts); 1876 if (status < 0) 1877 return status; 1878 } 1879 if (ops->get_current_limit) { 1880 status = device_create_file(dev, &dev_attr_microamps); 1881 if (status < 0) 1882 return status; 1883 } 1884 if (ops->get_mode) { 1885 status = device_create_file(dev, &dev_attr_opmode); 1886 if (status < 0) 1887 return status; 1888 } 1889 if (ops->is_enabled) { 1890 status = device_create_file(dev, &dev_attr_state); 1891 if (status < 0) 1892 return status; 1893 } 1894 if (ops->get_status) { 1895 status = device_create_file(dev, &dev_attr_status); 1896 if (status < 0) 1897 return status; 1898 } 1899 1900 /* some attributes are type-specific */ 1901 if (rdev->desc->type == REGULATOR_CURRENT) { 1902 status = device_create_file(dev, &dev_attr_requested_microamps); 1903 if (status < 0) 1904 return status; 1905 } 1906 1907 /* all the other attributes exist to support constraints; 1908 * don't show them if there are no constraints, or if the 1909 * relevant supporting methods are missing. 1910 */ 1911 if (!rdev->constraints) 1912 return status; 1913 1914 /* constraints need specific supporting methods */ 1915 if (ops->set_voltage) { 1916 status = device_create_file(dev, &dev_attr_min_microvolts); 1917 if (status < 0) 1918 return status; 1919 status = device_create_file(dev, &dev_attr_max_microvolts); 1920 if (status < 0) 1921 return status; 1922 } 1923 if (ops->set_current_limit) { 1924 status = device_create_file(dev, &dev_attr_min_microamps); 1925 if (status < 0) 1926 return status; 1927 status = device_create_file(dev, &dev_attr_max_microamps); 1928 if (status < 0) 1929 return status; 1930 } 1931 1932 /* suspend mode constraints need multiple supporting methods */ 1933 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 1934 return status; 1935 1936 status = device_create_file(dev, &dev_attr_suspend_standby_state); 1937 if (status < 0) 1938 return status; 1939 status = device_create_file(dev, &dev_attr_suspend_mem_state); 1940 if (status < 0) 1941 return status; 1942 status = device_create_file(dev, &dev_attr_suspend_disk_state); 1943 if (status < 0) 1944 return status; 1945 1946 if (ops->set_suspend_voltage) { 1947 status = device_create_file(dev, 1948 &dev_attr_suspend_standby_microvolts); 1949 if (status < 0) 1950 return status; 1951 status = device_create_file(dev, 1952 &dev_attr_suspend_mem_microvolts); 1953 if (status < 0) 1954 return status; 1955 status = device_create_file(dev, 1956 &dev_attr_suspend_disk_microvolts); 1957 if (status < 0) 1958 return status; 1959 } 1960 1961 if (ops->set_suspend_mode) { 1962 status = device_create_file(dev, 1963 &dev_attr_suspend_standby_mode); 1964 if (status < 0) 1965 return status; 1966 status = device_create_file(dev, 1967 &dev_attr_suspend_mem_mode); 1968 if (status < 0) 1969 return status; 1970 status = device_create_file(dev, 1971 &dev_attr_suspend_disk_mode); 1972 if (status < 0) 1973 return status; 1974 } 1975 1976 return status; 1977} 1978 1979/** 1980 * regulator_register - register regulator 1981 * @regulator_desc: regulator to register 1982 * @dev: struct device for the regulator 1983 * @init_data: platform provided init data, passed through by driver 1984 * @driver_data: private regulator data 1985 * 1986 * Called by regulator drivers to register a regulator. 1987 * Returns 0 on success. 1988 */ 1989struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 1990 struct device *dev, struct regulator_init_data *init_data, 1991 void *driver_data) 1992{ 1993 static atomic_t regulator_no = ATOMIC_INIT(0); 1994 struct regulator_dev *rdev; 1995 int ret, i; 1996 1997 if (regulator_desc == NULL) 1998 return ERR_PTR(-EINVAL); 1999 2000 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2001 return ERR_PTR(-EINVAL); 2002 2003 if (!regulator_desc->type == REGULATOR_VOLTAGE && 2004 !regulator_desc->type == REGULATOR_CURRENT) 2005 return ERR_PTR(-EINVAL); 2006 2007 if (!init_data) 2008 return ERR_PTR(-EINVAL); 2009 2010 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2011 if (rdev == NULL) 2012 return ERR_PTR(-ENOMEM); 2013 2014 mutex_lock(®ulator_list_mutex); 2015 2016 mutex_init(&rdev->mutex); 2017 rdev->reg_data = driver_data; 2018 rdev->owner = regulator_desc->owner; 2019 rdev->desc = regulator_desc; 2020 INIT_LIST_HEAD(&rdev->consumer_list); 2021 INIT_LIST_HEAD(&rdev->supply_list); 2022 INIT_LIST_HEAD(&rdev->list); 2023 INIT_LIST_HEAD(&rdev->slist); 2024 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2025 2026 /* preform any regulator specific init */ 2027 if (init_data->regulator_init) { 2028 ret = init_data->regulator_init(rdev->reg_data); 2029 if (ret < 0) 2030 goto clean; 2031 } 2032 2033 /* register with sysfs */ 2034 rdev->dev.class = ®ulator_class; 2035 rdev->dev.parent = dev; 2036 dev_set_name(&rdev->dev, "regulator.%d", 2037 atomic_inc_return(®ulator_no) - 1); 2038 ret = device_register(&rdev->dev); 2039 if (ret != 0) 2040 goto clean; 2041 2042 dev_set_drvdata(&rdev->dev, rdev); 2043 2044 /* set regulator constraints */ 2045 ret = set_machine_constraints(rdev, &init_data->constraints); 2046 if (ret < 0) 2047 goto scrub; 2048 2049 /* add attributes supported by this regulator */ 2050 ret = add_regulator_attributes(rdev); 2051 if (ret < 0) 2052 goto scrub; 2053 2054 /* set supply regulator if it exists */ 2055 if (init_data->supply_regulator_dev) { 2056 ret = set_supply(rdev, 2057 dev_get_drvdata(init_data->supply_regulator_dev)); 2058 if (ret < 0) 2059 goto scrub; 2060 } 2061 2062 /* add consumers devices */ 2063 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2064 ret = set_consumer_device_supply(rdev, 2065 init_data->consumer_supplies[i].dev, 2066 init_data->consumer_supplies[i].supply); 2067 if (ret < 0) { 2068 for (--i; i >= 0; i--) 2069 unset_consumer_device_supply(rdev, 2070 init_data->consumer_supplies[i].dev); 2071 goto scrub; 2072 } 2073 } 2074 2075 list_add(&rdev->list, ®ulator_list); 2076out: 2077 mutex_unlock(®ulator_list_mutex); 2078 return rdev; 2079 2080scrub: 2081 device_unregister(&rdev->dev); 2082clean: 2083 kfree(rdev); 2084 rdev = ERR_PTR(ret); 2085 goto out; 2086} 2087EXPORT_SYMBOL_GPL(regulator_register); 2088 2089/** 2090 * regulator_unregister - unregister regulator 2091 * @rdev: regulator to unregister 2092 * 2093 * Called by regulator drivers to unregister a regulator. 2094 */ 2095void regulator_unregister(struct regulator_dev *rdev) 2096{ 2097 if (rdev == NULL) 2098 return; 2099 2100 mutex_lock(®ulator_list_mutex); 2101 unset_regulator_supplies(rdev); 2102 list_del(&rdev->list); 2103 if (rdev->supply) 2104 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2105 device_unregister(&rdev->dev); 2106 mutex_unlock(®ulator_list_mutex); 2107} 2108EXPORT_SYMBOL_GPL(regulator_unregister); 2109 2110/** 2111 * regulator_suspend_prepare - prepare regulators for system wide suspend 2112 * @state: system suspend state 2113 * 2114 * Configure each regulator with it's suspend operating parameters for state. 2115 * This will usually be called by machine suspend code prior to supending. 2116 */ 2117int regulator_suspend_prepare(suspend_state_t state) 2118{ 2119 struct regulator_dev *rdev; 2120 int ret = 0; 2121 2122 /* ON is handled by regulator active state */ 2123 if (state == PM_SUSPEND_ON) 2124 return -EINVAL; 2125 2126 mutex_lock(®ulator_list_mutex); 2127 list_for_each_entry(rdev, ®ulator_list, list) { 2128 2129 mutex_lock(&rdev->mutex); 2130 ret = suspend_prepare(rdev, state); 2131 mutex_unlock(&rdev->mutex); 2132 2133 if (ret < 0) { 2134 printk(KERN_ERR "%s: failed to prepare %s\n", 2135 __func__, rdev->desc->name); 2136 goto out; 2137 } 2138 } 2139out: 2140 mutex_unlock(®ulator_list_mutex); 2141 return ret; 2142} 2143EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2144 2145/** 2146 * rdev_get_drvdata - get rdev regulator driver data 2147 * @rdev: regulator 2148 * 2149 * Get rdev regulator driver private data. This call can be used in the 2150 * regulator driver context. 2151 */ 2152void *rdev_get_drvdata(struct regulator_dev *rdev) 2153{ 2154 return rdev->reg_data; 2155} 2156EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2157 2158/** 2159 * regulator_get_drvdata - get regulator driver data 2160 * @regulator: regulator 2161 * 2162 * Get regulator driver private data. This call can be used in the consumer 2163 * driver context when non API regulator specific functions need to be called. 2164 */ 2165void *regulator_get_drvdata(struct regulator *regulator) 2166{ 2167 return regulator->rdev->reg_data; 2168} 2169EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2170 2171/** 2172 * regulator_set_drvdata - set regulator driver data 2173 * @regulator: regulator 2174 * @data: data 2175 */ 2176void regulator_set_drvdata(struct regulator *regulator, void *data) 2177{ 2178 regulator->rdev->reg_data = data; 2179} 2180EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2181 2182/** 2183 * regulator_get_id - get regulator ID 2184 * @rdev: regulator 2185 */ 2186int rdev_get_id(struct regulator_dev *rdev) 2187{ 2188 return rdev->desc->id; 2189} 2190EXPORT_SYMBOL_GPL(rdev_get_id); 2191 2192struct device *rdev_get_dev(struct regulator_dev *rdev) 2193{ 2194 return &rdev->dev; 2195} 2196EXPORT_SYMBOL_GPL(rdev_get_dev); 2197 2198void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2199{ 2200 return reg_init_data->driver_data; 2201} 2202EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2203 2204static int __init regulator_init(void) 2205{ 2206 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2207 return class_register(®ulator_class); 2208} 2209 2210/* init early to allow our consumers to complete system booting */ 2211core_initcall(regulator_init); 2212