core.c revision 3e2b9abda554e9f6105996dca77cca9ef98de17a
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 int enabled; /* count of client enables */ 56 char *supply_name; 57 struct device_attribute dev_attr; 58 struct regulator_dev *rdev; 59}; 60 61static int _regulator_is_enabled(struct regulator_dev *rdev); 62static int _regulator_disable(struct regulator_dev *rdev); 63static int _regulator_get_voltage(struct regulator_dev *rdev); 64static int _regulator_get_current_limit(struct regulator_dev *rdev); 65static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 66static void _notifier_call_chain(struct regulator_dev *rdev, 67 unsigned long event, void *data); 68 69/* gets the regulator for a given consumer device */ 70static struct regulator *get_device_regulator(struct device *dev) 71{ 72 struct regulator *regulator = NULL; 73 struct regulator_dev *rdev; 74 75 mutex_lock(®ulator_list_mutex); 76 list_for_each_entry(rdev, ®ulator_list, list) { 77 mutex_lock(&rdev->mutex); 78 list_for_each_entry(regulator, &rdev->consumer_list, list) { 79 if (regulator->dev == dev) { 80 mutex_unlock(&rdev->mutex); 81 mutex_unlock(®ulator_list_mutex); 82 return regulator; 83 } 84 } 85 mutex_unlock(&rdev->mutex); 86 } 87 mutex_unlock(®ulator_list_mutex); 88 return NULL; 89} 90 91/* Platform voltage constraint check */ 92static int regulator_check_voltage(struct regulator_dev *rdev, 93 int *min_uV, int *max_uV) 94{ 95 BUG_ON(*min_uV > *max_uV); 96 97 if (!rdev->constraints) { 98 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 99 rdev->desc->name); 100 return -ENODEV; 101 } 102 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 103 printk(KERN_ERR "%s: operation not allowed for %s\n", 104 __func__, rdev->desc->name); 105 return -EPERM; 106 } 107 108 if (*max_uV > rdev->constraints->max_uV) 109 *max_uV = rdev->constraints->max_uV; 110 if (*min_uV < rdev->constraints->min_uV) 111 *min_uV = rdev->constraints->min_uV; 112 113 if (*min_uV > *max_uV) 114 return -EINVAL; 115 116 return 0; 117} 118 119/* current constraint check */ 120static int regulator_check_current_limit(struct regulator_dev *rdev, 121 int *min_uA, int *max_uA) 122{ 123 BUG_ON(*min_uA > *max_uA); 124 125 if (!rdev->constraints) { 126 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 127 rdev->desc->name); 128 return -ENODEV; 129 } 130 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 131 printk(KERN_ERR "%s: operation not allowed for %s\n", 132 __func__, rdev->desc->name); 133 return -EPERM; 134 } 135 136 if (*max_uA > rdev->constraints->max_uA) 137 *max_uA = rdev->constraints->max_uA; 138 if (*min_uA < rdev->constraints->min_uA) 139 *min_uA = rdev->constraints->min_uA; 140 141 if (*min_uA > *max_uA) 142 return -EINVAL; 143 144 return 0; 145} 146 147/* operating mode constraint check */ 148static int regulator_check_mode(struct regulator_dev *rdev, int mode) 149{ 150 switch (mode) { 151 case REGULATOR_MODE_FAST: 152 case REGULATOR_MODE_NORMAL: 153 case REGULATOR_MODE_IDLE: 154 case REGULATOR_MODE_STANDBY: 155 break; 156 default: 157 return -EINVAL; 158 } 159 160 if (!rdev->constraints) { 161 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 162 rdev->desc->name); 163 return -ENODEV; 164 } 165 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 166 printk(KERN_ERR "%s: operation not allowed for %s\n", 167 __func__, rdev->desc->name); 168 return -EPERM; 169 } 170 if (!(rdev->constraints->valid_modes_mask & mode)) { 171 printk(KERN_ERR "%s: invalid mode %x for %s\n", 172 __func__, mode, rdev->desc->name); 173 return -EINVAL; 174 } 175 return 0; 176} 177 178/* dynamic regulator mode switching constraint check */ 179static int regulator_check_drms(struct regulator_dev *rdev) 180{ 181 if (!rdev->constraints) { 182 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 183 rdev->desc->name); 184 return -ENODEV; 185 } 186 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 187 printk(KERN_ERR "%s: operation not allowed for %s\n", 188 __func__, rdev->desc->name); 189 return -EPERM; 190 } 191 return 0; 192} 193 194static ssize_t device_requested_uA_show(struct device *dev, 195 struct device_attribute *attr, char *buf) 196{ 197 struct regulator *regulator; 198 199 regulator = get_device_regulator(dev); 200 if (regulator == NULL) 201 return 0; 202 203 return sprintf(buf, "%d\n", regulator->uA_load); 204} 205 206static ssize_t regulator_uV_show(struct device *dev, 207 struct device_attribute *attr, char *buf) 208{ 209 struct regulator_dev *rdev = dev_get_drvdata(dev); 210 ssize_t ret; 211 212 mutex_lock(&rdev->mutex); 213 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 214 mutex_unlock(&rdev->mutex); 215 216 return ret; 217} 218static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 219 220static ssize_t regulator_uA_show(struct device *dev, 221 struct device_attribute *attr, char *buf) 222{ 223 struct regulator_dev *rdev = dev_get_drvdata(dev); 224 225 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 226} 227static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 228 229static ssize_t regulator_name_show(struct device *dev, 230 struct device_attribute *attr, char *buf) 231{ 232 struct regulator_dev *rdev = dev_get_drvdata(dev); 233 const char *name; 234 235 if (rdev->constraints->name) 236 name = rdev->constraints->name; 237 else if (rdev->desc->name) 238 name = rdev->desc->name; 239 else 240 name = ""; 241 242 return sprintf(buf, "%s\n", name); 243} 244 245static ssize_t regulator_print_opmode(char *buf, int mode) 246{ 247 switch (mode) { 248 case REGULATOR_MODE_FAST: 249 return sprintf(buf, "fast\n"); 250 case REGULATOR_MODE_NORMAL: 251 return sprintf(buf, "normal\n"); 252 case REGULATOR_MODE_IDLE: 253 return sprintf(buf, "idle\n"); 254 case REGULATOR_MODE_STANDBY: 255 return sprintf(buf, "standby\n"); 256 } 257 return sprintf(buf, "unknown\n"); 258} 259 260static ssize_t regulator_opmode_show(struct device *dev, 261 struct device_attribute *attr, char *buf) 262{ 263 struct regulator_dev *rdev = dev_get_drvdata(dev); 264 265 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 266} 267static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 268 269static ssize_t regulator_print_state(char *buf, int state) 270{ 271 if (state > 0) 272 return sprintf(buf, "enabled\n"); 273 else if (state == 0) 274 return sprintf(buf, "disabled\n"); 275 else 276 return sprintf(buf, "unknown\n"); 277} 278 279static ssize_t regulator_state_show(struct device *dev, 280 struct device_attribute *attr, char *buf) 281{ 282 struct regulator_dev *rdev = dev_get_drvdata(dev); 283 284 return regulator_print_state(buf, _regulator_is_enabled(rdev)); 285} 286static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 287 288static ssize_t regulator_status_show(struct device *dev, 289 struct device_attribute *attr, char *buf) 290{ 291 struct regulator_dev *rdev = dev_get_drvdata(dev); 292 int status; 293 char *label; 294 295 status = rdev->desc->ops->get_status(rdev); 296 if (status < 0) 297 return status; 298 299 switch (status) { 300 case REGULATOR_STATUS_OFF: 301 label = "off"; 302 break; 303 case REGULATOR_STATUS_ON: 304 label = "on"; 305 break; 306 case REGULATOR_STATUS_ERROR: 307 label = "error"; 308 break; 309 case REGULATOR_STATUS_FAST: 310 label = "fast"; 311 break; 312 case REGULATOR_STATUS_NORMAL: 313 label = "normal"; 314 break; 315 case REGULATOR_STATUS_IDLE: 316 label = "idle"; 317 break; 318 case REGULATOR_STATUS_STANDBY: 319 label = "standby"; 320 break; 321 default: 322 return -ERANGE; 323 } 324 325 return sprintf(buf, "%s\n", label); 326} 327static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 328 329static ssize_t regulator_min_uA_show(struct device *dev, 330 struct device_attribute *attr, char *buf) 331{ 332 struct regulator_dev *rdev = dev_get_drvdata(dev); 333 334 if (!rdev->constraints) 335 return sprintf(buf, "constraint not defined\n"); 336 337 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 338} 339static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 340 341static ssize_t regulator_max_uA_show(struct device *dev, 342 struct device_attribute *attr, char *buf) 343{ 344 struct regulator_dev *rdev = dev_get_drvdata(dev); 345 346 if (!rdev->constraints) 347 return sprintf(buf, "constraint not defined\n"); 348 349 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 350} 351static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 352 353static ssize_t regulator_min_uV_show(struct device *dev, 354 struct device_attribute *attr, char *buf) 355{ 356 struct regulator_dev *rdev = dev_get_drvdata(dev); 357 358 if (!rdev->constraints) 359 return sprintf(buf, "constraint not defined\n"); 360 361 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 362} 363static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 364 365static ssize_t regulator_max_uV_show(struct device *dev, 366 struct device_attribute *attr, char *buf) 367{ 368 struct regulator_dev *rdev = dev_get_drvdata(dev); 369 370 if (!rdev->constraints) 371 return sprintf(buf, "constraint not defined\n"); 372 373 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 374} 375static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 376 377static ssize_t regulator_total_uA_show(struct device *dev, 378 struct device_attribute *attr, char *buf) 379{ 380 struct regulator_dev *rdev = dev_get_drvdata(dev); 381 struct regulator *regulator; 382 int uA = 0; 383 384 mutex_lock(&rdev->mutex); 385 list_for_each_entry(regulator, &rdev->consumer_list, list) 386 uA += regulator->uA_load; 387 mutex_unlock(&rdev->mutex); 388 return sprintf(buf, "%d\n", uA); 389} 390static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 391 392static ssize_t regulator_num_users_show(struct device *dev, 393 struct device_attribute *attr, char *buf) 394{ 395 struct regulator_dev *rdev = dev_get_drvdata(dev); 396 return sprintf(buf, "%d\n", rdev->use_count); 397} 398 399static ssize_t regulator_type_show(struct device *dev, 400 struct device_attribute *attr, char *buf) 401{ 402 struct regulator_dev *rdev = dev_get_drvdata(dev); 403 404 switch (rdev->desc->type) { 405 case REGULATOR_VOLTAGE: 406 return sprintf(buf, "voltage\n"); 407 case REGULATOR_CURRENT: 408 return sprintf(buf, "current\n"); 409 } 410 return sprintf(buf, "unknown\n"); 411} 412 413static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 414 struct device_attribute *attr, char *buf) 415{ 416 struct regulator_dev *rdev = dev_get_drvdata(dev); 417 418 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 419} 420static DEVICE_ATTR(suspend_mem_microvolts, 0444, 421 regulator_suspend_mem_uV_show, NULL); 422 423static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 424 struct device_attribute *attr, char *buf) 425{ 426 struct regulator_dev *rdev = dev_get_drvdata(dev); 427 428 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 429} 430static DEVICE_ATTR(suspend_disk_microvolts, 0444, 431 regulator_suspend_disk_uV_show, NULL); 432 433static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 434 struct device_attribute *attr, char *buf) 435{ 436 struct regulator_dev *rdev = dev_get_drvdata(dev); 437 438 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 439} 440static DEVICE_ATTR(suspend_standby_microvolts, 0444, 441 regulator_suspend_standby_uV_show, NULL); 442 443static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 444 struct device_attribute *attr, char *buf) 445{ 446 struct regulator_dev *rdev = dev_get_drvdata(dev); 447 448 return regulator_print_opmode(buf, 449 rdev->constraints->state_mem.mode); 450} 451static DEVICE_ATTR(suspend_mem_mode, 0444, 452 regulator_suspend_mem_mode_show, NULL); 453 454static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 return regulator_print_opmode(buf, 460 rdev->constraints->state_disk.mode); 461} 462static DEVICE_ATTR(suspend_disk_mode, 0444, 463 regulator_suspend_disk_mode_show, NULL); 464 465static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467{ 468 struct regulator_dev *rdev = dev_get_drvdata(dev); 469 470 return regulator_print_opmode(buf, 471 rdev->constraints->state_standby.mode); 472} 473static DEVICE_ATTR(suspend_standby_mode, 0444, 474 regulator_suspend_standby_mode_show, NULL); 475 476static ssize_t regulator_suspend_mem_state_show(struct device *dev, 477 struct device_attribute *attr, char *buf) 478{ 479 struct regulator_dev *rdev = dev_get_drvdata(dev); 480 481 return regulator_print_state(buf, 482 rdev->constraints->state_mem.enabled); 483} 484static DEVICE_ATTR(suspend_mem_state, 0444, 485 regulator_suspend_mem_state_show, NULL); 486 487static ssize_t regulator_suspend_disk_state_show(struct device *dev, 488 struct device_attribute *attr, char *buf) 489{ 490 struct regulator_dev *rdev = dev_get_drvdata(dev); 491 492 return regulator_print_state(buf, 493 rdev->constraints->state_disk.enabled); 494} 495static DEVICE_ATTR(suspend_disk_state, 0444, 496 regulator_suspend_disk_state_show, NULL); 497 498static ssize_t regulator_suspend_standby_state_show(struct device *dev, 499 struct device_attribute *attr, char *buf) 500{ 501 struct regulator_dev *rdev = dev_get_drvdata(dev); 502 503 return regulator_print_state(buf, 504 rdev->constraints->state_standby.enabled); 505} 506static DEVICE_ATTR(suspend_standby_state, 0444, 507 regulator_suspend_standby_state_show, NULL); 508 509 510/* 511 * These are the only attributes are present for all regulators. 512 * Other attributes are a function of regulator functionality. 513 */ 514static struct device_attribute regulator_dev_attrs[] = { 515 __ATTR(name, 0444, regulator_name_show, NULL), 516 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 517 __ATTR(type, 0444, regulator_type_show, NULL), 518 __ATTR_NULL, 519}; 520 521static void regulator_dev_release(struct device *dev) 522{ 523 struct regulator_dev *rdev = dev_get_drvdata(dev); 524 kfree(rdev); 525} 526 527static struct class regulator_class = { 528 .name = "regulator", 529 .dev_release = regulator_dev_release, 530 .dev_attrs = regulator_dev_attrs, 531}; 532 533/* Calculate the new optimum regulator operating mode based on the new total 534 * consumer load. All locks held by caller */ 535static void drms_uA_update(struct regulator_dev *rdev) 536{ 537 struct regulator *sibling; 538 int current_uA = 0, output_uV, input_uV, err; 539 unsigned int mode; 540 541 err = regulator_check_drms(rdev); 542 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 543 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode); 544 return; 545 546 /* get output voltage */ 547 output_uV = rdev->desc->ops->get_voltage(rdev); 548 if (output_uV <= 0) 549 return; 550 551 /* get input voltage */ 552 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 553 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 554 else 555 input_uV = rdev->constraints->input_uV; 556 if (input_uV <= 0) 557 return; 558 559 /* calc total requested load */ 560 list_for_each_entry(sibling, &rdev->consumer_list, list) 561 current_uA += sibling->uA_load; 562 563 /* now get the optimum mode for our new total regulator load */ 564 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 565 output_uV, current_uA); 566 567 /* check the new mode is allowed */ 568 err = regulator_check_mode(rdev, mode); 569 if (err == 0) 570 rdev->desc->ops->set_mode(rdev, mode); 571} 572 573static int suspend_set_state(struct regulator_dev *rdev, 574 struct regulator_state *rstate) 575{ 576 int ret = 0; 577 578 /* enable & disable are mandatory for suspend control */ 579 if (!rdev->desc->ops->set_suspend_enable || 580 !rdev->desc->ops->set_suspend_disable) { 581 printk(KERN_ERR "%s: no way to set suspend state\n", 582 __func__); 583 return -EINVAL; 584 } 585 586 if (rstate->enabled) 587 ret = rdev->desc->ops->set_suspend_enable(rdev); 588 else 589 ret = rdev->desc->ops->set_suspend_disable(rdev); 590 if (ret < 0) { 591 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 592 return ret; 593 } 594 595 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 596 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 597 if (ret < 0) { 598 printk(KERN_ERR "%s: failed to set voltage\n", 599 __func__); 600 return ret; 601 } 602 } 603 604 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 605 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 606 if (ret < 0) { 607 printk(KERN_ERR "%s: failed to set mode\n", __func__); 608 return ret; 609 } 610 } 611 return ret; 612} 613 614/* locks held by caller */ 615static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 616{ 617 if (!rdev->constraints) 618 return -EINVAL; 619 620 switch (state) { 621 case PM_SUSPEND_STANDBY: 622 return suspend_set_state(rdev, 623 &rdev->constraints->state_standby); 624 case PM_SUSPEND_MEM: 625 return suspend_set_state(rdev, 626 &rdev->constraints->state_mem); 627 case PM_SUSPEND_MAX: 628 return suspend_set_state(rdev, 629 &rdev->constraints->state_disk); 630 default: 631 return -EINVAL; 632 } 633} 634 635static void print_constraints(struct regulator_dev *rdev) 636{ 637 struct regulation_constraints *constraints = rdev->constraints; 638 char buf[80]; 639 int count; 640 641 if (rdev->desc->type == REGULATOR_VOLTAGE) { 642 if (constraints->min_uV == constraints->max_uV) 643 count = sprintf(buf, "%d mV ", 644 constraints->min_uV / 1000); 645 else 646 count = sprintf(buf, "%d <--> %d mV ", 647 constraints->min_uV / 1000, 648 constraints->max_uV / 1000); 649 } else { 650 if (constraints->min_uA == constraints->max_uA) 651 count = sprintf(buf, "%d mA ", 652 constraints->min_uA / 1000); 653 else 654 count = sprintf(buf, "%d <--> %d mA ", 655 constraints->min_uA / 1000, 656 constraints->max_uA / 1000); 657 } 658 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 659 count += sprintf(buf + count, "fast "); 660 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 661 count += sprintf(buf + count, "normal "); 662 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 663 count += sprintf(buf + count, "idle "); 664 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 665 count += sprintf(buf + count, "standby"); 666 667 printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf); 668} 669 670/** 671 * set_machine_constraints - sets regulator constraints 672 * @rdev: regulator source 673 * @constraints: constraints to apply 674 * 675 * Allows platform initialisation code to define and constrain 676 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 677 * Constraints *must* be set by platform code in order for some 678 * regulator operations to proceed i.e. set_voltage, set_current_limit, 679 * set_mode. 680 */ 681static int set_machine_constraints(struct regulator_dev *rdev, 682 struct regulation_constraints *constraints) 683{ 684 int ret = 0; 685 const char *name; 686 struct regulator_ops *ops = rdev->desc->ops; 687 688 if (constraints->name) 689 name = constraints->name; 690 else if (rdev->desc->name) 691 name = rdev->desc->name; 692 else 693 name = "regulator"; 694 695 /* constrain machine-level voltage specs to fit 696 * the actual range supported by this regulator. 697 */ 698 if (ops->list_voltage && rdev->desc->n_voltages) { 699 int count = rdev->desc->n_voltages; 700 int i; 701 int min_uV = INT_MAX; 702 int max_uV = INT_MIN; 703 int cmin = constraints->min_uV; 704 int cmax = constraints->max_uV; 705 706 /* it's safe to autoconfigure fixed-voltage supplies */ 707 if (count == 1 && !cmin) { 708 cmin = INT_MIN; 709 cmax = INT_MAX; 710 } 711 712 /* voltage constraints are optional */ 713 if ((cmin == 0) && (cmax == 0)) 714 goto out; 715 716 /* else require explicit machine-level constraints */ 717 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 718 pr_err("%s: %s '%s' voltage constraints\n", 719 __func__, "invalid", name); 720 ret = -EINVAL; 721 goto out; 722 } 723 724 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 725 for (i = 0; i < count; i++) { 726 int value; 727 728 value = ops->list_voltage(rdev, i); 729 if (value <= 0) 730 continue; 731 732 /* maybe adjust [min_uV..max_uV] */ 733 if (value >= cmin && value < min_uV) 734 min_uV = value; 735 if (value <= cmax && value > max_uV) 736 max_uV = value; 737 } 738 739 /* final: [min_uV..max_uV] valid iff constraints valid */ 740 if (max_uV < min_uV) { 741 pr_err("%s: %s '%s' voltage constraints\n", 742 __func__, "unsupportable", name); 743 ret = -EINVAL; 744 goto out; 745 } 746 747 /* use regulator's subset of machine constraints */ 748 if (constraints->min_uV < min_uV) { 749 pr_debug("%s: override '%s' %s, %d -> %d\n", 750 __func__, name, "min_uV", 751 constraints->min_uV, min_uV); 752 constraints->min_uV = min_uV; 753 } 754 if (constraints->max_uV > max_uV) { 755 pr_debug("%s: override '%s' %s, %d -> %d\n", 756 __func__, name, "max_uV", 757 constraints->max_uV, max_uV); 758 constraints->max_uV = max_uV; 759 } 760 } 761 762 rdev->constraints = constraints; 763 764 /* do we need to apply the constraint voltage */ 765 if (rdev->constraints->apply_uV && 766 rdev->constraints->min_uV == rdev->constraints->max_uV && 767 ops->set_voltage) { 768 ret = ops->set_voltage(rdev, 769 rdev->constraints->min_uV, rdev->constraints->max_uV); 770 if (ret < 0) { 771 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 772 __func__, 773 rdev->constraints->min_uV, name); 774 rdev->constraints = NULL; 775 goto out; 776 } 777 } 778 779 /* are we enabled at boot time by firmware / bootloader */ 780 if (rdev->constraints->boot_on) 781 rdev->use_count = 1; 782 783 /* do we need to setup our suspend state */ 784 if (constraints->initial_state) { 785 ret = suspend_prepare(rdev, constraints->initial_state); 786 if (ret < 0) { 787 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 788 __func__, name); 789 rdev->constraints = NULL; 790 goto out; 791 } 792 } 793 794 if (constraints->initial_mode) { 795 if (!ops->set_mode) { 796 printk(KERN_ERR "%s: no set_mode operation for %s\n", 797 __func__, name); 798 ret = -EINVAL; 799 goto out; 800 } 801 802 ret = ops->set_mode(rdev, constraints->initial_mode); 803 if (ret < 0) { 804 printk(KERN_ERR 805 "%s: failed to set initial mode for %s: %d\n", 806 __func__, name, ret); 807 goto out; 808 } 809 } 810 811 /* if always_on is set then turn the regulator on if it's not 812 * already on. */ 813 if (constraints->always_on && ops->enable && 814 ((ops->is_enabled && !ops->is_enabled(rdev)) || 815 (!ops->is_enabled && !constraints->boot_on))) { 816 ret = ops->enable(rdev); 817 if (ret < 0) { 818 printk(KERN_ERR "%s: failed to enable %s\n", 819 __func__, name); 820 rdev->constraints = NULL; 821 goto out; 822 } 823 } 824 825 print_constraints(rdev); 826out: 827 return ret; 828} 829 830/** 831 * set_supply - set regulator supply regulator 832 * @rdev: regulator name 833 * @supply_rdev: supply regulator name 834 * 835 * Called by platform initialisation code to set the supply regulator for this 836 * regulator. This ensures that a regulators supply will also be enabled by the 837 * core if it's child is enabled. 838 */ 839static int set_supply(struct regulator_dev *rdev, 840 struct regulator_dev *supply_rdev) 841{ 842 int err; 843 844 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 845 "supply"); 846 if (err) { 847 printk(KERN_ERR 848 "%s: could not add device link %s err %d\n", 849 __func__, supply_rdev->dev.kobj.name, err); 850 goto out; 851 } 852 rdev->supply = supply_rdev; 853 list_add(&rdev->slist, &supply_rdev->supply_list); 854out: 855 return err; 856} 857 858/** 859 * set_consumer_device_supply: Bind a regulator to a symbolic supply 860 * @rdev: regulator source 861 * @consumer_dev: device the supply applies to 862 * @supply: symbolic name for supply 863 * 864 * Allows platform initialisation code to map physical regulator 865 * sources to symbolic names for supplies for use by devices. Devices 866 * should use these symbolic names to request regulators, avoiding the 867 * need to provide board-specific regulator names as platform data. 868 */ 869static int set_consumer_device_supply(struct regulator_dev *rdev, 870 struct device *consumer_dev, const char *supply) 871{ 872 struct regulator_map *node; 873 874 if (supply == NULL) 875 return -EINVAL; 876 877 list_for_each_entry(node, ®ulator_map_list, list) { 878 if (consumer_dev != node->dev) 879 continue; 880 if (strcmp(node->supply, supply) != 0) 881 continue; 882 883 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 884 dev_name(&node->regulator->dev), 885 node->regulator->desc->name, 886 supply, 887 dev_name(&rdev->dev), rdev->desc->name); 888 return -EBUSY; 889 } 890 891 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); 892 if (node == NULL) 893 return -ENOMEM; 894 895 node->regulator = rdev; 896 node->dev = consumer_dev; 897 node->supply = supply; 898 899 list_add(&node->list, ®ulator_map_list); 900 return 0; 901} 902 903static void unset_consumer_device_supply(struct regulator_dev *rdev, 904 struct device *consumer_dev) 905{ 906 struct regulator_map *node, *n; 907 908 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 909 if (rdev == node->regulator && 910 consumer_dev == node->dev) { 911 list_del(&node->list); 912 kfree(node); 913 return; 914 } 915 } 916} 917 918static void unset_regulator_supplies(struct regulator_dev *rdev) 919{ 920 struct regulator_map *node, *n; 921 922 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 923 if (rdev == node->regulator) { 924 list_del(&node->list); 925 kfree(node); 926 return; 927 } 928 } 929} 930 931#define REG_STR_SIZE 32 932 933static struct regulator *create_regulator(struct regulator_dev *rdev, 934 struct device *dev, 935 const char *supply_name) 936{ 937 struct regulator *regulator; 938 char buf[REG_STR_SIZE]; 939 int err, size; 940 941 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 942 if (regulator == NULL) 943 return NULL; 944 945 mutex_lock(&rdev->mutex); 946 regulator->rdev = rdev; 947 list_add(®ulator->list, &rdev->consumer_list); 948 949 if (dev) { 950 /* create a 'requested_microamps_name' sysfs entry */ 951 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 952 supply_name); 953 if (size >= REG_STR_SIZE) 954 goto overflow_err; 955 956 regulator->dev = dev; 957 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 958 if (regulator->dev_attr.attr.name == NULL) 959 goto attr_name_err; 960 961 regulator->dev_attr.attr.owner = THIS_MODULE; 962 regulator->dev_attr.attr.mode = 0444; 963 regulator->dev_attr.show = device_requested_uA_show; 964 err = device_create_file(dev, ®ulator->dev_attr); 965 if (err < 0) { 966 printk(KERN_WARNING "%s: could not add regulator_dev" 967 " load sysfs\n", __func__); 968 goto attr_name_err; 969 } 970 971 /* also add a link to the device sysfs entry */ 972 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 973 dev->kobj.name, supply_name); 974 if (size >= REG_STR_SIZE) 975 goto attr_err; 976 977 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 978 if (regulator->supply_name == NULL) 979 goto attr_err; 980 981 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 982 buf); 983 if (err) { 984 printk(KERN_WARNING 985 "%s: could not add device link %s err %d\n", 986 __func__, dev->kobj.name, err); 987 device_remove_file(dev, ®ulator->dev_attr); 988 goto link_name_err; 989 } 990 } 991 mutex_unlock(&rdev->mutex); 992 return regulator; 993link_name_err: 994 kfree(regulator->supply_name); 995attr_err: 996 device_remove_file(regulator->dev, ®ulator->dev_attr); 997attr_name_err: 998 kfree(regulator->dev_attr.attr.name); 999overflow_err: 1000 list_del(®ulator->list); 1001 kfree(regulator); 1002 mutex_unlock(&rdev->mutex); 1003 return NULL; 1004} 1005 1006/** 1007 * regulator_get - lookup and obtain a reference to a regulator. 1008 * @dev: device for regulator "consumer" 1009 * @id: Supply name or regulator ID. 1010 * 1011 * Returns a struct regulator corresponding to the regulator producer, 1012 * or IS_ERR() condition containing errno. 1013 * 1014 * Use of supply names configured via regulator_set_device_supply() is 1015 * strongly encouraged. It is recommended that the supply name used 1016 * should match the name used for the supply and/or the relevant 1017 * device pins in the datasheet. 1018 */ 1019struct regulator *regulator_get(struct device *dev, const char *id) 1020{ 1021 struct regulator_dev *rdev; 1022 struct regulator_map *map; 1023 struct regulator *regulator = ERR_PTR(-ENODEV); 1024 1025 if (id == NULL) { 1026 printk(KERN_ERR "regulator: get() with no identifier\n"); 1027 return regulator; 1028 } 1029 1030 mutex_lock(®ulator_list_mutex); 1031 1032 list_for_each_entry(map, ®ulator_map_list, list) { 1033 if (dev == map->dev && 1034 strcmp(map->supply, id) == 0) { 1035 rdev = map->regulator; 1036 goto found; 1037 } 1038 } 1039 printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", 1040 id); 1041 mutex_unlock(®ulator_list_mutex); 1042 return regulator; 1043 1044found: 1045 if (!try_module_get(rdev->owner)) 1046 goto out; 1047 1048 regulator = create_regulator(rdev, dev, id); 1049 if (regulator == NULL) { 1050 regulator = ERR_PTR(-ENOMEM); 1051 module_put(rdev->owner); 1052 } 1053 1054out: 1055 mutex_unlock(®ulator_list_mutex); 1056 return regulator; 1057} 1058EXPORT_SYMBOL_GPL(regulator_get); 1059 1060/** 1061 * regulator_put - "free" the regulator source 1062 * @regulator: regulator source 1063 * 1064 * Note: drivers must ensure that all regulator_enable calls made on this 1065 * regulator source are balanced by regulator_disable calls prior to calling 1066 * this function. 1067 */ 1068void regulator_put(struct regulator *regulator) 1069{ 1070 struct regulator_dev *rdev; 1071 1072 if (regulator == NULL || IS_ERR(regulator)) 1073 return; 1074 1075 mutex_lock(®ulator_list_mutex); 1076 rdev = regulator->rdev; 1077 1078 if (WARN(regulator->enabled, "Releasing supply %s while enabled\n", 1079 regulator->supply_name)) 1080 _regulator_disable(rdev); 1081 1082 /* remove any sysfs entries */ 1083 if (regulator->dev) { 1084 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1085 kfree(regulator->supply_name); 1086 device_remove_file(regulator->dev, ®ulator->dev_attr); 1087 kfree(regulator->dev_attr.attr.name); 1088 } 1089 list_del(®ulator->list); 1090 kfree(regulator); 1091 1092 module_put(rdev->owner); 1093 mutex_unlock(®ulator_list_mutex); 1094} 1095EXPORT_SYMBOL_GPL(regulator_put); 1096 1097/* locks held by regulator_enable() */ 1098static int _regulator_enable(struct regulator_dev *rdev) 1099{ 1100 int ret = -EINVAL; 1101 1102 if (!rdev->constraints) { 1103 printk(KERN_ERR "%s: %s has no constraints\n", 1104 __func__, rdev->desc->name); 1105 return ret; 1106 } 1107 1108 /* do we need to enable the supply regulator first */ 1109 if (rdev->supply) { 1110 ret = _regulator_enable(rdev->supply); 1111 if (ret < 0) { 1112 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1113 __func__, rdev->desc->name, ret); 1114 return ret; 1115 } 1116 } 1117 1118 /* check voltage and requested load before enabling */ 1119 if (rdev->desc->ops->enable) { 1120 1121 if (rdev->constraints && 1122 (rdev->constraints->valid_ops_mask & 1123 REGULATOR_CHANGE_DRMS)) 1124 drms_uA_update(rdev); 1125 1126 ret = rdev->desc->ops->enable(rdev); 1127 if (ret < 0) { 1128 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1129 __func__, rdev->desc->name, ret); 1130 return ret; 1131 } 1132 rdev->use_count++; 1133 return ret; 1134 } 1135 1136 return ret; 1137} 1138 1139/** 1140 * regulator_enable - enable regulator output 1141 * @regulator: regulator source 1142 * 1143 * Request that the regulator be enabled with the regulator output at 1144 * the predefined voltage or current value. Calls to regulator_enable() 1145 * must be balanced with calls to regulator_disable(). 1146 * 1147 * NOTE: the output value can be set by other drivers, boot loader or may be 1148 * hardwired in the regulator. 1149 */ 1150int regulator_enable(struct regulator *regulator) 1151{ 1152 struct regulator_dev *rdev = regulator->rdev; 1153 int ret = 0; 1154 1155 mutex_lock(&rdev->mutex); 1156 if (regulator->enabled == 0) 1157 ret = _regulator_enable(rdev); 1158 else if (regulator->enabled < 0) 1159 ret = -EIO; 1160 if (ret == 0) 1161 regulator->enabled++; 1162 mutex_unlock(&rdev->mutex); 1163 return ret; 1164} 1165EXPORT_SYMBOL_GPL(regulator_enable); 1166 1167/* locks held by regulator_disable() */ 1168static int _regulator_disable(struct regulator_dev *rdev) 1169{ 1170 int ret = 0; 1171 1172 /* are we the last user and permitted to disable ? */ 1173 if (rdev->use_count == 1 && !rdev->constraints->always_on) { 1174 1175 /* we are last user */ 1176 if (rdev->desc->ops->disable) { 1177 ret = rdev->desc->ops->disable(rdev); 1178 if (ret < 0) { 1179 printk(KERN_ERR "%s: failed to disable %s\n", 1180 __func__, rdev->desc->name); 1181 return ret; 1182 } 1183 } 1184 1185 /* decrease our supplies ref count and disable if required */ 1186 if (rdev->supply) 1187 _regulator_disable(rdev->supply); 1188 1189 rdev->use_count = 0; 1190 } else if (rdev->use_count > 1) { 1191 1192 if (rdev->constraints && 1193 (rdev->constraints->valid_ops_mask & 1194 REGULATOR_CHANGE_DRMS)) 1195 drms_uA_update(rdev); 1196 1197 rdev->use_count--; 1198 } 1199 return ret; 1200} 1201 1202/** 1203 * regulator_disable - disable regulator output 1204 * @regulator: regulator source 1205 * 1206 * Disable the regulator output voltage or current. Calls to 1207 * regulator_enable() must be balanced with calls to 1208 * regulator_disable(). 1209 * 1210 * NOTE: this will only disable the regulator output if no other consumer 1211 * devices have it enabled, the regulator device supports disabling and 1212 * machine constraints permit this operation. 1213 */ 1214int regulator_disable(struct regulator *regulator) 1215{ 1216 struct regulator_dev *rdev = regulator->rdev; 1217 int ret = 0; 1218 1219 mutex_lock(&rdev->mutex); 1220 if (regulator->enabled == 1) { 1221 ret = _regulator_disable(rdev); 1222 if (ret == 0) 1223 regulator->uA_load = 0; 1224 } else if (WARN(regulator->enabled <= 0, 1225 "unbalanced disables for supply %s\n", 1226 regulator->supply_name)) 1227 ret = -EIO; 1228 if (ret == 0) 1229 regulator->enabled--; 1230 mutex_unlock(&rdev->mutex); 1231 return ret; 1232} 1233EXPORT_SYMBOL_GPL(regulator_disable); 1234 1235/* locks held by regulator_force_disable() */ 1236static int _regulator_force_disable(struct regulator_dev *rdev) 1237{ 1238 int ret = 0; 1239 1240 /* force disable */ 1241 if (rdev->desc->ops->disable) { 1242 /* ah well, who wants to live forever... */ 1243 ret = rdev->desc->ops->disable(rdev); 1244 if (ret < 0) { 1245 printk(KERN_ERR "%s: failed to force disable %s\n", 1246 __func__, rdev->desc->name); 1247 return ret; 1248 } 1249 /* notify other consumers that power has been forced off */ 1250 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, 1251 NULL); 1252 } 1253 1254 /* decrease our supplies ref count and disable if required */ 1255 if (rdev->supply) 1256 _regulator_disable(rdev->supply); 1257 1258 rdev->use_count = 0; 1259 return ret; 1260} 1261 1262/** 1263 * regulator_force_disable - force disable regulator output 1264 * @regulator: regulator source 1265 * 1266 * Forcibly disable the regulator output voltage or current. 1267 * NOTE: this *will* disable the regulator output even if other consumer 1268 * devices have it enabled. This should be used for situations when device 1269 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1270 */ 1271int regulator_force_disable(struct regulator *regulator) 1272{ 1273 int ret; 1274 1275 mutex_lock(®ulator->rdev->mutex); 1276 regulator->enabled = 0; 1277 regulator->uA_load = 0; 1278 ret = _regulator_force_disable(regulator->rdev); 1279 mutex_unlock(®ulator->rdev->mutex); 1280 return ret; 1281} 1282EXPORT_SYMBOL_GPL(regulator_force_disable); 1283 1284static int _regulator_is_enabled(struct regulator_dev *rdev) 1285{ 1286 int ret; 1287 1288 mutex_lock(&rdev->mutex); 1289 1290 /* sanity check */ 1291 if (!rdev->desc->ops->is_enabled) { 1292 ret = -EINVAL; 1293 goto out; 1294 } 1295 1296 ret = rdev->desc->ops->is_enabled(rdev); 1297out: 1298 mutex_unlock(&rdev->mutex); 1299 return ret; 1300} 1301 1302/** 1303 * regulator_is_enabled - is the regulator output enabled 1304 * @regulator: regulator source 1305 * 1306 * Returns positive if the regulator driver backing the source/client 1307 * has requested that the device be enabled, zero if it hasn't, else a 1308 * negative errno code. 1309 * 1310 * Note that the device backing this regulator handle can have multiple 1311 * users, so it might be enabled even if regulator_enable() was never 1312 * called for this particular source. 1313 */ 1314int regulator_is_enabled(struct regulator *regulator) 1315{ 1316 return _regulator_is_enabled(regulator->rdev); 1317} 1318EXPORT_SYMBOL_GPL(regulator_is_enabled); 1319 1320/** 1321 * regulator_count_voltages - count regulator_list_voltage() selectors 1322 * @regulator: regulator source 1323 * 1324 * Returns number of selectors, or negative errno. Selectors are 1325 * numbered starting at zero, and typically correspond to bitfields 1326 * in hardware registers. 1327 */ 1328int regulator_count_voltages(struct regulator *regulator) 1329{ 1330 struct regulator_dev *rdev = regulator->rdev; 1331 1332 return rdev->desc->n_voltages ? : -EINVAL; 1333} 1334EXPORT_SYMBOL_GPL(regulator_count_voltages); 1335 1336/** 1337 * regulator_list_voltage - enumerate supported voltages 1338 * @regulator: regulator source 1339 * @selector: identify voltage to list 1340 * Context: can sleep 1341 * 1342 * Returns a voltage that can be passed to @regulator_set_voltage(), 1343 * zero if this selector code can't be used on this sytem, or a 1344 * negative errno. 1345 */ 1346int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1347{ 1348 struct regulator_dev *rdev = regulator->rdev; 1349 struct regulator_ops *ops = rdev->desc->ops; 1350 int ret; 1351 1352 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1353 return -EINVAL; 1354 1355 mutex_lock(&rdev->mutex); 1356 ret = ops->list_voltage(rdev, selector); 1357 mutex_unlock(&rdev->mutex); 1358 1359 if (ret > 0) { 1360 if (ret < rdev->constraints->min_uV) 1361 ret = 0; 1362 else if (ret > rdev->constraints->max_uV) 1363 ret = 0; 1364 } 1365 1366 return ret; 1367} 1368EXPORT_SYMBOL_GPL(regulator_list_voltage); 1369 1370/** 1371 * regulator_set_voltage - set regulator output voltage 1372 * @regulator: regulator source 1373 * @min_uV: Minimum required voltage in uV 1374 * @max_uV: Maximum acceptable voltage in uV 1375 * 1376 * Sets a voltage regulator to the desired output voltage. This can be set 1377 * during any regulator state. IOW, regulator can be disabled or enabled. 1378 * 1379 * If the regulator is enabled then the voltage will change to the new value 1380 * immediately otherwise if the regulator is disabled the regulator will 1381 * output at the new voltage when enabled. 1382 * 1383 * NOTE: If the regulator is shared between several devices then the lowest 1384 * request voltage that meets the system constraints will be used. 1385 * Regulator system constraints must be set for this regulator before 1386 * calling this function otherwise this call will fail. 1387 */ 1388int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1389{ 1390 struct regulator_dev *rdev = regulator->rdev; 1391 int ret; 1392 1393 mutex_lock(&rdev->mutex); 1394 1395 /* sanity check */ 1396 if (!rdev->desc->ops->set_voltage) { 1397 ret = -EINVAL; 1398 goto out; 1399 } 1400 1401 /* constraints check */ 1402 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1403 if (ret < 0) 1404 goto out; 1405 regulator->min_uV = min_uV; 1406 regulator->max_uV = max_uV; 1407 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1408 1409out: 1410 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1411 mutex_unlock(&rdev->mutex); 1412 return ret; 1413} 1414EXPORT_SYMBOL_GPL(regulator_set_voltage); 1415 1416static int _regulator_get_voltage(struct regulator_dev *rdev) 1417{ 1418 /* sanity check */ 1419 if (rdev->desc->ops->get_voltage) 1420 return rdev->desc->ops->get_voltage(rdev); 1421 else 1422 return -EINVAL; 1423} 1424 1425/** 1426 * regulator_get_voltage - get regulator output voltage 1427 * @regulator: regulator source 1428 * 1429 * This returns the current regulator voltage in uV. 1430 * 1431 * NOTE: If the regulator is disabled it will return the voltage value. This 1432 * function should not be used to determine regulator state. 1433 */ 1434int regulator_get_voltage(struct regulator *regulator) 1435{ 1436 int ret; 1437 1438 mutex_lock(®ulator->rdev->mutex); 1439 1440 ret = _regulator_get_voltage(regulator->rdev); 1441 1442 mutex_unlock(®ulator->rdev->mutex); 1443 1444 return ret; 1445} 1446EXPORT_SYMBOL_GPL(regulator_get_voltage); 1447 1448/** 1449 * regulator_set_current_limit - set regulator output current limit 1450 * @regulator: regulator source 1451 * @min_uA: Minimuum supported current in uA 1452 * @max_uA: Maximum supported current in uA 1453 * 1454 * Sets current sink to the desired output current. This can be set during 1455 * any regulator state. IOW, regulator can be disabled or enabled. 1456 * 1457 * If the regulator is enabled then the current will change to the new value 1458 * immediately otherwise if the regulator is disabled the regulator will 1459 * output at the new current when enabled. 1460 * 1461 * NOTE: Regulator system constraints must be set for this regulator before 1462 * calling this function otherwise this call will fail. 1463 */ 1464int regulator_set_current_limit(struct regulator *regulator, 1465 int min_uA, int max_uA) 1466{ 1467 struct regulator_dev *rdev = regulator->rdev; 1468 int ret; 1469 1470 mutex_lock(&rdev->mutex); 1471 1472 /* sanity check */ 1473 if (!rdev->desc->ops->set_current_limit) { 1474 ret = -EINVAL; 1475 goto out; 1476 } 1477 1478 /* constraints check */ 1479 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1480 if (ret < 0) 1481 goto out; 1482 1483 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1484out: 1485 mutex_unlock(&rdev->mutex); 1486 return ret; 1487} 1488EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1489 1490static int _regulator_get_current_limit(struct regulator_dev *rdev) 1491{ 1492 int ret; 1493 1494 mutex_lock(&rdev->mutex); 1495 1496 /* sanity check */ 1497 if (!rdev->desc->ops->get_current_limit) { 1498 ret = -EINVAL; 1499 goto out; 1500 } 1501 1502 ret = rdev->desc->ops->get_current_limit(rdev); 1503out: 1504 mutex_unlock(&rdev->mutex); 1505 return ret; 1506} 1507 1508/** 1509 * regulator_get_current_limit - get regulator output current 1510 * @regulator: regulator source 1511 * 1512 * This returns the current supplied by the specified current sink in uA. 1513 * 1514 * NOTE: If the regulator is disabled it will return the current value. This 1515 * function should not be used to determine regulator state. 1516 */ 1517int regulator_get_current_limit(struct regulator *regulator) 1518{ 1519 return _regulator_get_current_limit(regulator->rdev); 1520} 1521EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1522 1523/** 1524 * regulator_set_mode - set regulator operating mode 1525 * @regulator: regulator source 1526 * @mode: operating mode - one of the REGULATOR_MODE constants 1527 * 1528 * Set regulator operating mode to increase regulator efficiency or improve 1529 * regulation performance. 1530 * 1531 * NOTE: Regulator system constraints must be set for this regulator before 1532 * calling this function otherwise this call will fail. 1533 */ 1534int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1535{ 1536 struct regulator_dev *rdev = regulator->rdev; 1537 int ret; 1538 1539 mutex_lock(&rdev->mutex); 1540 1541 /* sanity check */ 1542 if (!rdev->desc->ops->set_mode) { 1543 ret = -EINVAL; 1544 goto out; 1545 } 1546 1547 /* constraints check */ 1548 ret = regulator_check_mode(rdev, mode); 1549 if (ret < 0) 1550 goto out; 1551 1552 ret = rdev->desc->ops->set_mode(rdev, mode); 1553out: 1554 mutex_unlock(&rdev->mutex); 1555 return ret; 1556} 1557EXPORT_SYMBOL_GPL(regulator_set_mode); 1558 1559static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1560{ 1561 int ret; 1562 1563 mutex_lock(&rdev->mutex); 1564 1565 /* sanity check */ 1566 if (!rdev->desc->ops->get_mode) { 1567 ret = -EINVAL; 1568 goto out; 1569 } 1570 1571 ret = rdev->desc->ops->get_mode(rdev); 1572out: 1573 mutex_unlock(&rdev->mutex); 1574 return ret; 1575} 1576 1577/** 1578 * regulator_get_mode - get regulator operating mode 1579 * @regulator: regulator source 1580 * 1581 * Get the current regulator operating mode. 1582 */ 1583unsigned int regulator_get_mode(struct regulator *regulator) 1584{ 1585 return _regulator_get_mode(regulator->rdev); 1586} 1587EXPORT_SYMBOL_GPL(regulator_get_mode); 1588 1589/** 1590 * regulator_set_optimum_mode - set regulator optimum operating mode 1591 * @regulator: regulator source 1592 * @uA_load: load current 1593 * 1594 * Notifies the regulator core of a new device load. This is then used by 1595 * DRMS (if enabled by constraints) to set the most efficient regulator 1596 * operating mode for the new regulator loading. 1597 * 1598 * Consumer devices notify their supply regulator of the maximum power 1599 * they will require (can be taken from device datasheet in the power 1600 * consumption tables) when they change operational status and hence power 1601 * state. Examples of operational state changes that can affect power 1602 * consumption are :- 1603 * 1604 * o Device is opened / closed. 1605 * o Device I/O is about to begin or has just finished. 1606 * o Device is idling in between work. 1607 * 1608 * This information is also exported via sysfs to userspace. 1609 * 1610 * DRMS will sum the total requested load on the regulator and change 1611 * to the most efficient operating mode if platform constraints allow. 1612 * 1613 * Returns the new regulator mode or error. 1614 */ 1615int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1616{ 1617 struct regulator_dev *rdev = regulator->rdev; 1618 struct regulator *consumer; 1619 int ret, output_uV, input_uV, total_uA_load = 0; 1620 unsigned int mode; 1621 1622 mutex_lock(&rdev->mutex); 1623 1624 regulator->uA_load = uA_load; 1625 ret = regulator_check_drms(rdev); 1626 if (ret < 0) 1627 goto out; 1628 ret = -EINVAL; 1629 1630 /* sanity check */ 1631 if (!rdev->desc->ops->get_optimum_mode) 1632 goto out; 1633 1634 /* get output voltage */ 1635 output_uV = rdev->desc->ops->get_voltage(rdev); 1636 if (output_uV <= 0) { 1637 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1638 __func__, rdev->desc->name); 1639 goto out; 1640 } 1641 1642 /* get input voltage */ 1643 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1644 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1645 else 1646 input_uV = rdev->constraints->input_uV; 1647 if (input_uV <= 0) { 1648 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1649 __func__, rdev->desc->name); 1650 goto out; 1651 } 1652 1653 /* calc total requested load for this regulator */ 1654 list_for_each_entry(consumer, &rdev->consumer_list, list) 1655 total_uA_load += consumer->uA_load; 1656 1657 mode = rdev->desc->ops->get_optimum_mode(rdev, 1658 input_uV, output_uV, 1659 total_uA_load); 1660 ret = regulator_check_mode(rdev, mode); 1661 if (ret < 0) { 1662 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1663 " %d uA %d -> %d uV\n", __func__, rdev->desc->name, 1664 total_uA_load, input_uV, output_uV); 1665 goto out; 1666 } 1667 1668 ret = rdev->desc->ops->set_mode(rdev, mode); 1669 if (ret < 0) { 1670 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1671 __func__, mode, rdev->desc->name); 1672 goto out; 1673 } 1674 ret = mode; 1675out: 1676 mutex_unlock(&rdev->mutex); 1677 return ret; 1678} 1679EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1680 1681/** 1682 * regulator_register_notifier - register regulator event notifier 1683 * @regulator: regulator source 1684 * @nb: notifier block 1685 * 1686 * Register notifier block to receive regulator events. 1687 */ 1688int regulator_register_notifier(struct regulator *regulator, 1689 struct notifier_block *nb) 1690{ 1691 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1692 nb); 1693} 1694EXPORT_SYMBOL_GPL(regulator_register_notifier); 1695 1696/** 1697 * regulator_unregister_notifier - unregister regulator event notifier 1698 * @regulator: regulator source 1699 * @nb: notifier block 1700 * 1701 * Unregister regulator event notifier block. 1702 */ 1703int regulator_unregister_notifier(struct regulator *regulator, 1704 struct notifier_block *nb) 1705{ 1706 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1707 nb); 1708} 1709EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1710 1711/* notify regulator consumers and downstream regulator consumers. 1712 * Note mutex must be held by caller. 1713 */ 1714static void _notifier_call_chain(struct regulator_dev *rdev, 1715 unsigned long event, void *data) 1716{ 1717 struct regulator_dev *_rdev; 1718 1719 /* call rdev chain first */ 1720 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1721 1722 /* now notify regulator we supply */ 1723 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1724 mutex_lock(&_rdev->mutex); 1725 _notifier_call_chain(_rdev, event, data); 1726 mutex_unlock(&_rdev->mutex); 1727 } 1728} 1729 1730/** 1731 * regulator_bulk_get - get multiple regulator consumers 1732 * 1733 * @dev: Device to supply 1734 * @num_consumers: Number of consumers to register 1735 * @consumers: Configuration of consumers; clients are stored here. 1736 * 1737 * @return 0 on success, an errno on failure. 1738 * 1739 * This helper function allows drivers to get several regulator 1740 * consumers in one operation. If any of the regulators cannot be 1741 * acquired then any regulators that were allocated will be freed 1742 * before returning to the caller. 1743 */ 1744int regulator_bulk_get(struct device *dev, int num_consumers, 1745 struct regulator_bulk_data *consumers) 1746{ 1747 int i; 1748 int ret; 1749 1750 for (i = 0; i < num_consumers; i++) 1751 consumers[i].consumer = NULL; 1752 1753 for (i = 0; i < num_consumers; i++) { 1754 consumers[i].consumer = regulator_get(dev, 1755 consumers[i].supply); 1756 if (IS_ERR(consumers[i].consumer)) { 1757 dev_err(dev, "Failed to get supply '%s'\n", 1758 consumers[i].supply); 1759 ret = PTR_ERR(consumers[i].consumer); 1760 consumers[i].consumer = NULL; 1761 goto err; 1762 } 1763 } 1764 1765 return 0; 1766 1767err: 1768 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1769 regulator_put(consumers[i].consumer); 1770 1771 return ret; 1772} 1773EXPORT_SYMBOL_GPL(regulator_bulk_get); 1774 1775/** 1776 * regulator_bulk_enable - enable multiple regulator consumers 1777 * 1778 * @num_consumers: Number of consumers 1779 * @consumers: Consumer data; clients are stored here. 1780 * @return 0 on success, an errno on failure 1781 * 1782 * This convenience API allows consumers to enable multiple regulator 1783 * clients in a single API call. If any consumers cannot be enabled 1784 * then any others that were enabled will be disabled again prior to 1785 * return. 1786 */ 1787int regulator_bulk_enable(int num_consumers, 1788 struct regulator_bulk_data *consumers) 1789{ 1790 int i; 1791 int ret; 1792 1793 for (i = 0; i < num_consumers; i++) { 1794 ret = regulator_enable(consumers[i].consumer); 1795 if (ret != 0) 1796 goto err; 1797 } 1798 1799 return 0; 1800 1801err: 1802 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); 1803 for (i = 0; i < num_consumers; i++) 1804 regulator_disable(consumers[i].consumer); 1805 1806 return ret; 1807} 1808EXPORT_SYMBOL_GPL(regulator_bulk_enable); 1809 1810/** 1811 * regulator_bulk_disable - disable multiple regulator consumers 1812 * 1813 * @num_consumers: Number of consumers 1814 * @consumers: Consumer data; clients are stored here. 1815 * @return 0 on success, an errno on failure 1816 * 1817 * This convenience API allows consumers to disable multiple regulator 1818 * clients in a single API call. If any consumers cannot be enabled 1819 * then any others that were disabled will be disabled again prior to 1820 * return. 1821 */ 1822int regulator_bulk_disable(int num_consumers, 1823 struct regulator_bulk_data *consumers) 1824{ 1825 int i; 1826 int ret; 1827 1828 for (i = 0; i < num_consumers; i++) { 1829 ret = regulator_disable(consumers[i].consumer); 1830 if (ret != 0) 1831 goto err; 1832 } 1833 1834 return 0; 1835 1836err: 1837 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); 1838 for (i = 0; i < num_consumers; i++) 1839 regulator_enable(consumers[i].consumer); 1840 1841 return ret; 1842} 1843EXPORT_SYMBOL_GPL(regulator_bulk_disable); 1844 1845/** 1846 * regulator_bulk_free - free multiple regulator consumers 1847 * 1848 * @num_consumers: Number of consumers 1849 * @consumers: Consumer data; clients are stored here. 1850 * 1851 * This convenience API allows consumers to free multiple regulator 1852 * clients in a single API call. 1853 */ 1854void regulator_bulk_free(int num_consumers, 1855 struct regulator_bulk_data *consumers) 1856{ 1857 int i; 1858 1859 for (i = 0; i < num_consumers; i++) { 1860 regulator_put(consumers[i].consumer); 1861 consumers[i].consumer = NULL; 1862 } 1863} 1864EXPORT_SYMBOL_GPL(regulator_bulk_free); 1865 1866/** 1867 * regulator_notifier_call_chain - call regulator event notifier 1868 * @rdev: regulator source 1869 * @event: notifier block 1870 * @data: callback-specific data. 1871 * 1872 * Called by regulator drivers to notify clients a regulator event has 1873 * occurred. We also notify regulator clients downstream. 1874 * Note lock must be held by caller. 1875 */ 1876int regulator_notifier_call_chain(struct regulator_dev *rdev, 1877 unsigned long event, void *data) 1878{ 1879 _notifier_call_chain(rdev, event, data); 1880 return NOTIFY_DONE; 1881 1882} 1883EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 1884 1885/* 1886 * To avoid cluttering sysfs (and memory) with useless state, only 1887 * create attributes that can be meaningfully displayed. 1888 */ 1889static int add_regulator_attributes(struct regulator_dev *rdev) 1890{ 1891 struct device *dev = &rdev->dev; 1892 struct regulator_ops *ops = rdev->desc->ops; 1893 int status = 0; 1894 1895 /* some attributes need specific methods to be displayed */ 1896 if (ops->get_voltage) { 1897 status = device_create_file(dev, &dev_attr_microvolts); 1898 if (status < 0) 1899 return status; 1900 } 1901 if (ops->get_current_limit) { 1902 status = device_create_file(dev, &dev_attr_microamps); 1903 if (status < 0) 1904 return status; 1905 } 1906 if (ops->get_mode) { 1907 status = device_create_file(dev, &dev_attr_opmode); 1908 if (status < 0) 1909 return status; 1910 } 1911 if (ops->is_enabled) { 1912 status = device_create_file(dev, &dev_attr_state); 1913 if (status < 0) 1914 return status; 1915 } 1916 if (ops->get_status) { 1917 status = device_create_file(dev, &dev_attr_status); 1918 if (status < 0) 1919 return status; 1920 } 1921 1922 /* some attributes are type-specific */ 1923 if (rdev->desc->type == REGULATOR_CURRENT) { 1924 status = device_create_file(dev, &dev_attr_requested_microamps); 1925 if (status < 0) 1926 return status; 1927 } 1928 1929 /* all the other attributes exist to support constraints; 1930 * don't show them if there are no constraints, or if the 1931 * relevant supporting methods are missing. 1932 */ 1933 if (!rdev->constraints) 1934 return status; 1935 1936 /* constraints need specific supporting methods */ 1937 if (ops->set_voltage) { 1938 status = device_create_file(dev, &dev_attr_min_microvolts); 1939 if (status < 0) 1940 return status; 1941 status = device_create_file(dev, &dev_attr_max_microvolts); 1942 if (status < 0) 1943 return status; 1944 } 1945 if (ops->set_current_limit) { 1946 status = device_create_file(dev, &dev_attr_min_microamps); 1947 if (status < 0) 1948 return status; 1949 status = device_create_file(dev, &dev_attr_max_microamps); 1950 if (status < 0) 1951 return status; 1952 } 1953 1954 /* suspend mode constraints need multiple supporting methods */ 1955 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 1956 return status; 1957 1958 status = device_create_file(dev, &dev_attr_suspend_standby_state); 1959 if (status < 0) 1960 return status; 1961 status = device_create_file(dev, &dev_attr_suspend_mem_state); 1962 if (status < 0) 1963 return status; 1964 status = device_create_file(dev, &dev_attr_suspend_disk_state); 1965 if (status < 0) 1966 return status; 1967 1968 if (ops->set_suspend_voltage) { 1969 status = device_create_file(dev, 1970 &dev_attr_suspend_standby_microvolts); 1971 if (status < 0) 1972 return status; 1973 status = device_create_file(dev, 1974 &dev_attr_suspend_mem_microvolts); 1975 if (status < 0) 1976 return status; 1977 status = device_create_file(dev, 1978 &dev_attr_suspend_disk_microvolts); 1979 if (status < 0) 1980 return status; 1981 } 1982 1983 if (ops->set_suspend_mode) { 1984 status = device_create_file(dev, 1985 &dev_attr_suspend_standby_mode); 1986 if (status < 0) 1987 return status; 1988 status = device_create_file(dev, 1989 &dev_attr_suspend_mem_mode); 1990 if (status < 0) 1991 return status; 1992 status = device_create_file(dev, 1993 &dev_attr_suspend_disk_mode); 1994 if (status < 0) 1995 return status; 1996 } 1997 1998 return status; 1999} 2000 2001/** 2002 * regulator_register - register regulator 2003 * @regulator_desc: regulator to register 2004 * @dev: struct device for the regulator 2005 * @init_data: platform provided init data, passed through by driver 2006 * @driver_data: private regulator data 2007 * 2008 * Called by regulator drivers to register a regulator. 2009 * Returns 0 on success. 2010 */ 2011struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2012 struct device *dev, struct regulator_init_data *init_data, 2013 void *driver_data) 2014{ 2015 static atomic_t regulator_no = ATOMIC_INIT(0); 2016 struct regulator_dev *rdev; 2017 int ret, i; 2018 2019 if (regulator_desc == NULL) 2020 return ERR_PTR(-EINVAL); 2021 2022 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2023 return ERR_PTR(-EINVAL); 2024 2025 if (!regulator_desc->type == REGULATOR_VOLTAGE && 2026 !regulator_desc->type == REGULATOR_CURRENT) 2027 return ERR_PTR(-EINVAL); 2028 2029 if (!init_data) 2030 return ERR_PTR(-EINVAL); 2031 2032 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2033 if (rdev == NULL) 2034 return ERR_PTR(-ENOMEM); 2035 2036 mutex_lock(®ulator_list_mutex); 2037 2038 mutex_init(&rdev->mutex); 2039 rdev->reg_data = driver_data; 2040 rdev->owner = regulator_desc->owner; 2041 rdev->desc = regulator_desc; 2042 INIT_LIST_HEAD(&rdev->consumer_list); 2043 INIT_LIST_HEAD(&rdev->supply_list); 2044 INIT_LIST_HEAD(&rdev->list); 2045 INIT_LIST_HEAD(&rdev->slist); 2046 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2047 2048 /* preform any regulator specific init */ 2049 if (init_data->regulator_init) { 2050 ret = init_data->regulator_init(rdev->reg_data); 2051 if (ret < 0) 2052 goto clean; 2053 } 2054 2055 /* register with sysfs */ 2056 rdev->dev.class = ®ulator_class; 2057 rdev->dev.parent = dev; 2058 dev_set_name(&rdev->dev, "regulator.%d", 2059 atomic_inc_return(®ulator_no) - 1); 2060 ret = device_register(&rdev->dev); 2061 if (ret != 0) 2062 goto clean; 2063 2064 dev_set_drvdata(&rdev->dev, rdev); 2065 2066 /* set regulator constraints */ 2067 ret = set_machine_constraints(rdev, &init_data->constraints); 2068 if (ret < 0) 2069 goto scrub; 2070 2071 /* add attributes supported by this regulator */ 2072 ret = add_regulator_attributes(rdev); 2073 if (ret < 0) 2074 goto scrub; 2075 2076 /* set supply regulator if it exists */ 2077 if (init_data->supply_regulator_dev) { 2078 ret = set_supply(rdev, 2079 dev_get_drvdata(init_data->supply_regulator_dev)); 2080 if (ret < 0) 2081 goto scrub; 2082 } 2083 2084 /* add consumers devices */ 2085 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2086 ret = set_consumer_device_supply(rdev, 2087 init_data->consumer_supplies[i].dev, 2088 init_data->consumer_supplies[i].supply); 2089 if (ret < 0) { 2090 for (--i; i >= 0; i--) 2091 unset_consumer_device_supply(rdev, 2092 init_data->consumer_supplies[i].dev); 2093 goto scrub; 2094 } 2095 } 2096 2097 list_add(&rdev->list, ®ulator_list); 2098out: 2099 mutex_unlock(®ulator_list_mutex); 2100 return rdev; 2101 2102scrub: 2103 device_unregister(&rdev->dev); 2104clean: 2105 kfree(rdev); 2106 rdev = ERR_PTR(ret); 2107 goto out; 2108} 2109EXPORT_SYMBOL_GPL(regulator_register); 2110 2111/** 2112 * regulator_unregister - unregister regulator 2113 * @rdev: regulator to unregister 2114 * 2115 * Called by regulator drivers to unregister a regulator. 2116 */ 2117void regulator_unregister(struct regulator_dev *rdev) 2118{ 2119 if (rdev == NULL) 2120 return; 2121 2122 mutex_lock(®ulator_list_mutex); 2123 unset_regulator_supplies(rdev); 2124 list_del(&rdev->list); 2125 if (rdev->supply) 2126 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2127 device_unregister(&rdev->dev); 2128 mutex_unlock(®ulator_list_mutex); 2129} 2130EXPORT_SYMBOL_GPL(regulator_unregister); 2131 2132/** 2133 * regulator_suspend_prepare - prepare regulators for system wide suspend 2134 * @state: system suspend state 2135 * 2136 * Configure each regulator with it's suspend operating parameters for state. 2137 * This will usually be called by machine suspend code prior to supending. 2138 */ 2139int regulator_suspend_prepare(suspend_state_t state) 2140{ 2141 struct regulator_dev *rdev; 2142 int ret = 0; 2143 2144 /* ON is handled by regulator active state */ 2145 if (state == PM_SUSPEND_ON) 2146 return -EINVAL; 2147 2148 mutex_lock(®ulator_list_mutex); 2149 list_for_each_entry(rdev, ®ulator_list, list) { 2150 2151 mutex_lock(&rdev->mutex); 2152 ret = suspend_prepare(rdev, state); 2153 mutex_unlock(&rdev->mutex); 2154 2155 if (ret < 0) { 2156 printk(KERN_ERR "%s: failed to prepare %s\n", 2157 __func__, rdev->desc->name); 2158 goto out; 2159 } 2160 } 2161out: 2162 mutex_unlock(®ulator_list_mutex); 2163 return ret; 2164} 2165EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2166 2167/** 2168 * rdev_get_drvdata - get rdev regulator driver data 2169 * @rdev: regulator 2170 * 2171 * Get rdev regulator driver private data. This call can be used in the 2172 * regulator driver context. 2173 */ 2174void *rdev_get_drvdata(struct regulator_dev *rdev) 2175{ 2176 return rdev->reg_data; 2177} 2178EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2179 2180/** 2181 * regulator_get_drvdata - get regulator driver data 2182 * @regulator: regulator 2183 * 2184 * Get regulator driver private data. This call can be used in the consumer 2185 * driver context when non API regulator specific functions need to be called. 2186 */ 2187void *regulator_get_drvdata(struct regulator *regulator) 2188{ 2189 return regulator->rdev->reg_data; 2190} 2191EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2192 2193/** 2194 * regulator_set_drvdata - set regulator driver data 2195 * @regulator: regulator 2196 * @data: data 2197 */ 2198void regulator_set_drvdata(struct regulator *regulator, void *data) 2199{ 2200 regulator->rdev->reg_data = data; 2201} 2202EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2203 2204/** 2205 * regulator_get_id - get regulator ID 2206 * @rdev: regulator 2207 */ 2208int rdev_get_id(struct regulator_dev *rdev) 2209{ 2210 return rdev->desc->id; 2211} 2212EXPORT_SYMBOL_GPL(rdev_get_id); 2213 2214struct device *rdev_get_dev(struct regulator_dev *rdev) 2215{ 2216 return &rdev->dev; 2217} 2218EXPORT_SYMBOL_GPL(rdev_get_dev); 2219 2220void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2221{ 2222 return reg_init_data->driver_data; 2223} 2224EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2225 2226static int __init regulator_init(void) 2227{ 2228 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2229 return class_register(®ulator_class); 2230} 2231 2232/* init early to allow our consumers to complete system booting */ 2233core_initcall(regulator_init); 2234