core.c revision 4367cfdc7c657ad8a797f51b9ffd3c64b31910e7
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 /* else require explicit machine-level constraints */ 713 else if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 714 pr_err("%s: %s '%s' voltage constraints\n", 715 __func__, "invalid", name); 716 ret = -EINVAL; 717 goto out; 718 } 719 720 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 721 for (i = 0; i < count; i++) { 722 int value; 723 724 value = ops->list_voltage(rdev, i); 725 if (value <= 0) 726 continue; 727 728 /* maybe adjust [min_uV..max_uV] */ 729 if (value >= cmin && value < min_uV) 730 min_uV = value; 731 if (value <= cmax && value > max_uV) 732 max_uV = value; 733 } 734 735 /* final: [min_uV..max_uV] valid iff constraints valid */ 736 if (max_uV < min_uV) { 737 pr_err("%s: %s '%s' voltage constraints\n", 738 __func__, "unsupportable", name); 739 ret = -EINVAL; 740 goto out; 741 } 742 743 /* use regulator's subset of machine constraints */ 744 if (constraints->min_uV < min_uV) { 745 pr_debug("%s: override '%s' %s, %d -> %d\n", 746 __func__, name, "min_uV", 747 constraints->min_uV, min_uV); 748 constraints->min_uV = min_uV; 749 } 750 if (constraints->max_uV > max_uV) { 751 pr_debug("%s: override '%s' %s, %d -> %d\n", 752 __func__, name, "max_uV", 753 constraints->max_uV, max_uV); 754 constraints->max_uV = max_uV; 755 } 756 } 757 758 rdev->constraints = constraints; 759 760 /* do we need to apply the constraint voltage */ 761 if (rdev->constraints->apply_uV && 762 rdev->constraints->min_uV == rdev->constraints->max_uV && 763 ops->set_voltage) { 764 ret = ops->set_voltage(rdev, 765 rdev->constraints->min_uV, rdev->constraints->max_uV); 766 if (ret < 0) { 767 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 768 __func__, 769 rdev->constraints->min_uV, name); 770 rdev->constraints = NULL; 771 goto out; 772 } 773 } 774 775 /* are we enabled at boot time by firmware / bootloader */ 776 if (rdev->constraints->boot_on) 777 rdev->use_count = 1; 778 779 /* do we need to setup our suspend state */ 780 if (constraints->initial_state) { 781 ret = suspend_prepare(rdev, constraints->initial_state); 782 if (ret < 0) { 783 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 784 __func__, name); 785 rdev->constraints = NULL; 786 goto out; 787 } 788 } 789 790 if (constraints->initial_mode) { 791 if (!ops->set_mode) { 792 printk(KERN_ERR "%s: no set_mode operation for %s\n", 793 __func__, name); 794 ret = -EINVAL; 795 goto out; 796 } 797 798 ret = ops->set_mode(rdev, constraints->initial_mode); 799 if (ret < 0) { 800 printk(KERN_ERR 801 "%s: failed to set initial mode for %s: %d\n", 802 __func__, name, ret); 803 goto out; 804 } 805 } 806 807 /* if always_on is set then turn the regulator on if it's not 808 * already on. */ 809 if (constraints->always_on && ops->enable && 810 ((ops->is_enabled && !ops->is_enabled(rdev)) || 811 (!ops->is_enabled && !constraints->boot_on))) { 812 ret = ops->enable(rdev); 813 if (ret < 0) { 814 printk(KERN_ERR "%s: failed to enable %s\n", 815 __func__, name); 816 rdev->constraints = NULL; 817 goto out; 818 } 819 } 820 821 print_constraints(rdev); 822out: 823 return ret; 824} 825 826/** 827 * set_supply - set regulator supply regulator 828 * @rdev: regulator name 829 * @supply_rdev: supply regulator name 830 * 831 * Called by platform initialisation code to set the supply regulator for this 832 * regulator. This ensures that a regulators supply will also be enabled by the 833 * core if it's child is enabled. 834 */ 835static int set_supply(struct regulator_dev *rdev, 836 struct regulator_dev *supply_rdev) 837{ 838 int err; 839 840 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 841 "supply"); 842 if (err) { 843 printk(KERN_ERR 844 "%s: could not add device link %s err %d\n", 845 __func__, supply_rdev->dev.kobj.name, err); 846 goto out; 847 } 848 rdev->supply = supply_rdev; 849 list_add(&rdev->slist, &supply_rdev->supply_list); 850out: 851 return err; 852} 853 854/** 855 * set_consumer_device_supply: Bind a regulator to a symbolic supply 856 * @rdev: regulator source 857 * @consumer_dev: device the supply applies to 858 * @supply: symbolic name for supply 859 * 860 * Allows platform initialisation code to map physical regulator 861 * sources to symbolic names for supplies for use by devices. Devices 862 * should use these symbolic names to request regulators, avoiding the 863 * need to provide board-specific regulator names as platform data. 864 */ 865static int set_consumer_device_supply(struct regulator_dev *rdev, 866 struct device *consumer_dev, const char *supply) 867{ 868 struct regulator_map *node; 869 870 if (supply == NULL) 871 return -EINVAL; 872 873 list_for_each_entry(node, ®ulator_map_list, list) { 874 if (consumer_dev != node->dev) 875 continue; 876 if (strcmp(node->supply, supply) != 0) 877 continue; 878 879 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 880 dev_name(&node->regulator->dev), 881 node->regulator->desc->name, 882 supply, 883 dev_name(&rdev->dev), rdev->desc->name); 884 return -EBUSY; 885 } 886 887 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); 888 if (node == NULL) 889 return -ENOMEM; 890 891 node->regulator = rdev; 892 node->dev = consumer_dev; 893 node->supply = supply; 894 895 list_add(&node->list, ®ulator_map_list); 896 return 0; 897} 898 899static void unset_consumer_device_supply(struct regulator_dev *rdev, 900 struct device *consumer_dev) 901{ 902 struct regulator_map *node, *n; 903 904 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 905 if (rdev == node->regulator && 906 consumer_dev == node->dev) { 907 list_del(&node->list); 908 kfree(node); 909 return; 910 } 911 } 912} 913 914static void unset_regulator_supplies(struct regulator_dev *rdev) 915{ 916 struct regulator_map *node, *n; 917 918 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 919 if (rdev == node->regulator) { 920 list_del(&node->list); 921 kfree(node); 922 return; 923 } 924 } 925} 926 927#define REG_STR_SIZE 32 928 929static struct regulator *create_regulator(struct regulator_dev *rdev, 930 struct device *dev, 931 const char *supply_name) 932{ 933 struct regulator *regulator; 934 char buf[REG_STR_SIZE]; 935 int err, size; 936 937 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 938 if (regulator == NULL) 939 return NULL; 940 941 mutex_lock(&rdev->mutex); 942 regulator->rdev = rdev; 943 list_add(®ulator->list, &rdev->consumer_list); 944 945 if (dev) { 946 /* create a 'requested_microamps_name' sysfs entry */ 947 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 948 supply_name); 949 if (size >= REG_STR_SIZE) 950 goto overflow_err; 951 952 regulator->dev = dev; 953 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 954 if (regulator->dev_attr.attr.name == NULL) 955 goto attr_name_err; 956 957 regulator->dev_attr.attr.owner = THIS_MODULE; 958 regulator->dev_attr.attr.mode = 0444; 959 regulator->dev_attr.show = device_requested_uA_show; 960 err = device_create_file(dev, ®ulator->dev_attr); 961 if (err < 0) { 962 printk(KERN_WARNING "%s: could not add regulator_dev" 963 " load sysfs\n", __func__); 964 goto attr_name_err; 965 } 966 967 /* also add a link to the device sysfs entry */ 968 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 969 dev->kobj.name, supply_name); 970 if (size >= REG_STR_SIZE) 971 goto attr_err; 972 973 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 974 if (regulator->supply_name == NULL) 975 goto attr_err; 976 977 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 978 buf); 979 if (err) { 980 printk(KERN_WARNING 981 "%s: could not add device link %s err %d\n", 982 __func__, dev->kobj.name, err); 983 device_remove_file(dev, ®ulator->dev_attr); 984 goto link_name_err; 985 } 986 } 987 mutex_unlock(&rdev->mutex); 988 return regulator; 989link_name_err: 990 kfree(regulator->supply_name); 991attr_err: 992 device_remove_file(regulator->dev, ®ulator->dev_attr); 993attr_name_err: 994 kfree(regulator->dev_attr.attr.name); 995overflow_err: 996 list_del(®ulator->list); 997 kfree(regulator); 998 mutex_unlock(&rdev->mutex); 999 return NULL; 1000} 1001 1002/** 1003 * regulator_get - lookup and obtain a reference to a regulator. 1004 * @dev: device for regulator "consumer" 1005 * @id: Supply name or regulator ID. 1006 * 1007 * Returns a struct regulator corresponding to the regulator producer, 1008 * or IS_ERR() condition containing errno. 1009 * 1010 * Use of supply names configured via regulator_set_device_supply() is 1011 * strongly encouraged. It is recommended that the supply name used 1012 * should match the name used for the supply and/or the relevant 1013 * device pins in the datasheet. 1014 */ 1015struct regulator *regulator_get(struct device *dev, const char *id) 1016{ 1017 struct regulator_dev *rdev; 1018 struct regulator_map *map; 1019 struct regulator *regulator = ERR_PTR(-ENODEV); 1020 1021 if (id == NULL) { 1022 printk(KERN_ERR "regulator: get() with no identifier\n"); 1023 return regulator; 1024 } 1025 1026 mutex_lock(®ulator_list_mutex); 1027 1028 list_for_each_entry(map, ®ulator_map_list, list) { 1029 if (dev == map->dev && 1030 strcmp(map->supply, id) == 0) { 1031 rdev = map->regulator; 1032 goto found; 1033 } 1034 } 1035 printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n", 1036 id); 1037 mutex_unlock(®ulator_list_mutex); 1038 return regulator; 1039 1040found: 1041 if (!try_module_get(rdev->owner)) 1042 goto out; 1043 1044 regulator = create_regulator(rdev, dev, id); 1045 if (regulator == NULL) { 1046 regulator = ERR_PTR(-ENOMEM); 1047 module_put(rdev->owner); 1048 } 1049 1050out: 1051 mutex_unlock(®ulator_list_mutex); 1052 return regulator; 1053} 1054EXPORT_SYMBOL_GPL(regulator_get); 1055 1056/** 1057 * regulator_put - "free" the regulator source 1058 * @regulator: regulator source 1059 * 1060 * Note: drivers must ensure that all regulator_enable calls made on this 1061 * regulator source are balanced by regulator_disable calls prior to calling 1062 * this function. 1063 */ 1064void regulator_put(struct regulator *regulator) 1065{ 1066 struct regulator_dev *rdev; 1067 1068 if (regulator == NULL || IS_ERR(regulator)) 1069 return; 1070 1071 mutex_lock(®ulator_list_mutex); 1072 rdev = regulator->rdev; 1073 1074 if (WARN(regulator->enabled, "Releasing supply %s while enabled\n", 1075 regulator->supply_name)) 1076 _regulator_disable(rdev); 1077 1078 /* remove any sysfs entries */ 1079 if (regulator->dev) { 1080 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1081 kfree(regulator->supply_name); 1082 device_remove_file(regulator->dev, ®ulator->dev_attr); 1083 kfree(regulator->dev_attr.attr.name); 1084 } 1085 list_del(®ulator->list); 1086 kfree(regulator); 1087 1088 module_put(rdev->owner); 1089 mutex_unlock(®ulator_list_mutex); 1090} 1091EXPORT_SYMBOL_GPL(regulator_put); 1092 1093/* locks held by regulator_enable() */ 1094static int _regulator_enable(struct regulator_dev *rdev) 1095{ 1096 int ret = -EINVAL; 1097 1098 if (!rdev->constraints) { 1099 printk(KERN_ERR "%s: %s has no constraints\n", 1100 __func__, rdev->desc->name); 1101 return ret; 1102 } 1103 1104 /* do we need to enable the supply regulator first */ 1105 if (rdev->supply) { 1106 ret = _regulator_enable(rdev->supply); 1107 if (ret < 0) { 1108 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1109 __func__, rdev->desc->name, ret); 1110 return ret; 1111 } 1112 } 1113 1114 /* check voltage and requested load before enabling */ 1115 if (rdev->desc->ops->enable) { 1116 1117 if (rdev->constraints && 1118 (rdev->constraints->valid_ops_mask & 1119 REGULATOR_CHANGE_DRMS)) 1120 drms_uA_update(rdev); 1121 1122 ret = rdev->desc->ops->enable(rdev); 1123 if (ret < 0) { 1124 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1125 __func__, rdev->desc->name, ret); 1126 return ret; 1127 } 1128 rdev->use_count++; 1129 return ret; 1130 } 1131 1132 return ret; 1133} 1134 1135/** 1136 * regulator_enable - enable regulator output 1137 * @regulator: regulator source 1138 * 1139 * Request that the regulator be enabled with the regulator output at 1140 * the predefined voltage or current value. Calls to regulator_enable() 1141 * must be balanced with calls to regulator_disable(). 1142 * 1143 * NOTE: the output value can be set by other drivers, boot loader or may be 1144 * hardwired in the regulator. 1145 */ 1146int regulator_enable(struct regulator *regulator) 1147{ 1148 struct regulator_dev *rdev = regulator->rdev; 1149 int ret = 0; 1150 1151 mutex_lock(&rdev->mutex); 1152 if (regulator->enabled == 0) 1153 ret = _regulator_enable(rdev); 1154 else if (regulator->enabled < 0) 1155 ret = -EIO; 1156 if (ret == 0) 1157 regulator->enabled++; 1158 mutex_unlock(&rdev->mutex); 1159 return ret; 1160} 1161EXPORT_SYMBOL_GPL(regulator_enable); 1162 1163/* locks held by regulator_disable() */ 1164static int _regulator_disable(struct regulator_dev *rdev) 1165{ 1166 int ret = 0; 1167 1168 /* are we the last user and permitted to disable ? */ 1169 if (rdev->use_count == 1 && !rdev->constraints->always_on) { 1170 1171 /* we are last user */ 1172 if (rdev->desc->ops->disable) { 1173 ret = rdev->desc->ops->disable(rdev); 1174 if (ret < 0) { 1175 printk(KERN_ERR "%s: failed to disable %s\n", 1176 __func__, rdev->desc->name); 1177 return ret; 1178 } 1179 } 1180 1181 /* decrease our supplies ref count and disable if required */ 1182 if (rdev->supply) 1183 _regulator_disable(rdev->supply); 1184 1185 rdev->use_count = 0; 1186 } else if (rdev->use_count > 1) { 1187 1188 if (rdev->constraints && 1189 (rdev->constraints->valid_ops_mask & 1190 REGULATOR_CHANGE_DRMS)) 1191 drms_uA_update(rdev); 1192 1193 rdev->use_count--; 1194 } 1195 return ret; 1196} 1197 1198/** 1199 * regulator_disable - disable regulator output 1200 * @regulator: regulator source 1201 * 1202 * Disable the regulator output voltage or current. Calls to 1203 * regulator_enable() must be balanced with calls to 1204 * regulator_disable(). 1205 * 1206 * NOTE: this will only disable the regulator output if no other consumer 1207 * devices have it enabled, the regulator device supports disabling and 1208 * machine constraints permit this operation. 1209 */ 1210int regulator_disable(struct regulator *regulator) 1211{ 1212 struct regulator_dev *rdev = regulator->rdev; 1213 int ret = 0; 1214 1215 mutex_lock(&rdev->mutex); 1216 if (regulator->enabled == 1) { 1217 ret = _regulator_disable(rdev); 1218 if (ret == 0) 1219 regulator->uA_load = 0; 1220 } else if (WARN(regulator->enabled <= 0, 1221 "unbalanced disables for supply %s\n", 1222 regulator->supply_name)) 1223 ret = -EIO; 1224 if (ret == 0) 1225 regulator->enabled--; 1226 mutex_unlock(&rdev->mutex); 1227 return ret; 1228} 1229EXPORT_SYMBOL_GPL(regulator_disable); 1230 1231/* locks held by regulator_force_disable() */ 1232static int _regulator_force_disable(struct regulator_dev *rdev) 1233{ 1234 int ret = 0; 1235 1236 /* force disable */ 1237 if (rdev->desc->ops->disable) { 1238 /* ah well, who wants to live forever... */ 1239 ret = rdev->desc->ops->disable(rdev); 1240 if (ret < 0) { 1241 printk(KERN_ERR "%s: failed to force disable %s\n", 1242 __func__, rdev->desc->name); 1243 return ret; 1244 } 1245 /* notify other consumers that power has been forced off */ 1246 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, 1247 NULL); 1248 } 1249 1250 /* decrease our supplies ref count and disable if required */ 1251 if (rdev->supply) 1252 _regulator_disable(rdev->supply); 1253 1254 rdev->use_count = 0; 1255 return ret; 1256} 1257 1258/** 1259 * regulator_force_disable - force disable regulator output 1260 * @regulator: regulator source 1261 * 1262 * Forcibly disable the regulator output voltage or current. 1263 * NOTE: this *will* disable the regulator output even if other consumer 1264 * devices have it enabled. This should be used for situations when device 1265 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1266 */ 1267int regulator_force_disable(struct regulator *regulator) 1268{ 1269 int ret; 1270 1271 mutex_lock(®ulator->rdev->mutex); 1272 regulator->enabled = 0; 1273 regulator->uA_load = 0; 1274 ret = _regulator_force_disable(regulator->rdev); 1275 mutex_unlock(®ulator->rdev->mutex); 1276 return ret; 1277} 1278EXPORT_SYMBOL_GPL(regulator_force_disable); 1279 1280static int _regulator_is_enabled(struct regulator_dev *rdev) 1281{ 1282 int ret; 1283 1284 mutex_lock(&rdev->mutex); 1285 1286 /* sanity check */ 1287 if (!rdev->desc->ops->is_enabled) { 1288 ret = -EINVAL; 1289 goto out; 1290 } 1291 1292 ret = rdev->desc->ops->is_enabled(rdev); 1293out: 1294 mutex_unlock(&rdev->mutex); 1295 return ret; 1296} 1297 1298/** 1299 * regulator_is_enabled - is the regulator output enabled 1300 * @regulator: regulator source 1301 * 1302 * Returns positive if the regulator driver backing the source/client 1303 * has requested that the device be enabled, zero if it hasn't, else a 1304 * negative errno code. 1305 * 1306 * Note that the device backing this regulator handle can have multiple 1307 * users, so it might be enabled even if regulator_enable() was never 1308 * called for this particular source. 1309 */ 1310int regulator_is_enabled(struct regulator *regulator) 1311{ 1312 return _regulator_is_enabled(regulator->rdev); 1313} 1314EXPORT_SYMBOL_GPL(regulator_is_enabled); 1315 1316/** 1317 * regulator_count_voltages - count regulator_list_voltage() selectors 1318 * @regulator: regulator source 1319 * 1320 * Returns number of selectors, or negative errno. Selectors are 1321 * numbered starting at zero, and typically correspond to bitfields 1322 * in hardware registers. 1323 */ 1324int regulator_count_voltages(struct regulator *regulator) 1325{ 1326 struct regulator_dev *rdev = regulator->rdev; 1327 1328 return rdev->desc->n_voltages ? : -EINVAL; 1329} 1330EXPORT_SYMBOL_GPL(regulator_count_voltages); 1331 1332/** 1333 * regulator_list_voltage - enumerate supported voltages 1334 * @regulator: regulator source 1335 * @selector: identify voltage to list 1336 * Context: can sleep 1337 * 1338 * Returns a voltage that can be passed to @regulator_set_voltage(), 1339 * zero if this selector code can't be used on this sytem, or a 1340 * negative errno. 1341 */ 1342int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1343{ 1344 struct regulator_dev *rdev = regulator->rdev; 1345 struct regulator_ops *ops = rdev->desc->ops; 1346 int ret; 1347 1348 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1349 return -EINVAL; 1350 1351 mutex_lock(&rdev->mutex); 1352 ret = ops->list_voltage(rdev, selector); 1353 mutex_unlock(&rdev->mutex); 1354 1355 if (ret > 0) { 1356 if (ret < rdev->constraints->min_uV) 1357 ret = 0; 1358 else if (ret > rdev->constraints->max_uV) 1359 ret = 0; 1360 } 1361 1362 return ret; 1363} 1364EXPORT_SYMBOL_GPL(regulator_list_voltage); 1365 1366/** 1367 * regulator_set_voltage - set regulator output voltage 1368 * @regulator: regulator source 1369 * @min_uV: Minimum required voltage in uV 1370 * @max_uV: Maximum acceptable voltage in uV 1371 * 1372 * Sets a voltage regulator to the desired output voltage. This can be set 1373 * during any regulator state. IOW, regulator can be disabled or enabled. 1374 * 1375 * If the regulator is enabled then the voltage will change to the new value 1376 * immediately otherwise if the regulator is disabled the regulator will 1377 * output at the new voltage when enabled. 1378 * 1379 * NOTE: If the regulator is shared between several devices then the lowest 1380 * request voltage that meets the system constraints will be used. 1381 * Regulator system constraints must be set for this regulator before 1382 * calling this function otherwise this call will fail. 1383 */ 1384int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1385{ 1386 struct regulator_dev *rdev = regulator->rdev; 1387 int ret; 1388 1389 mutex_lock(&rdev->mutex); 1390 1391 /* sanity check */ 1392 if (!rdev->desc->ops->set_voltage) { 1393 ret = -EINVAL; 1394 goto out; 1395 } 1396 1397 /* constraints check */ 1398 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1399 if (ret < 0) 1400 goto out; 1401 regulator->min_uV = min_uV; 1402 regulator->max_uV = max_uV; 1403 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1404 1405out: 1406 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1407 mutex_unlock(&rdev->mutex); 1408 return ret; 1409} 1410EXPORT_SYMBOL_GPL(regulator_set_voltage); 1411 1412static int _regulator_get_voltage(struct regulator_dev *rdev) 1413{ 1414 /* sanity check */ 1415 if (rdev->desc->ops->get_voltage) 1416 return rdev->desc->ops->get_voltage(rdev); 1417 else 1418 return -EINVAL; 1419} 1420 1421/** 1422 * regulator_get_voltage - get regulator output voltage 1423 * @regulator: regulator source 1424 * 1425 * This returns the current regulator voltage in uV. 1426 * 1427 * NOTE: If the regulator is disabled it will return the voltage value. This 1428 * function should not be used to determine regulator state. 1429 */ 1430int regulator_get_voltage(struct regulator *regulator) 1431{ 1432 int ret; 1433 1434 mutex_lock(®ulator->rdev->mutex); 1435 1436 ret = _regulator_get_voltage(regulator->rdev); 1437 1438 mutex_unlock(®ulator->rdev->mutex); 1439 1440 return ret; 1441} 1442EXPORT_SYMBOL_GPL(regulator_get_voltage); 1443 1444/** 1445 * regulator_set_current_limit - set regulator output current limit 1446 * @regulator: regulator source 1447 * @min_uA: Minimuum supported current in uA 1448 * @max_uA: Maximum supported current in uA 1449 * 1450 * Sets current sink to the desired output current. This can be set during 1451 * any regulator state. IOW, regulator can be disabled or enabled. 1452 * 1453 * If the regulator is enabled then the current will change to the new value 1454 * immediately otherwise if the regulator is disabled the regulator will 1455 * output at the new current when enabled. 1456 * 1457 * NOTE: Regulator system constraints must be set for this regulator before 1458 * calling this function otherwise this call will fail. 1459 */ 1460int regulator_set_current_limit(struct regulator *regulator, 1461 int min_uA, int max_uA) 1462{ 1463 struct regulator_dev *rdev = regulator->rdev; 1464 int ret; 1465 1466 mutex_lock(&rdev->mutex); 1467 1468 /* sanity check */ 1469 if (!rdev->desc->ops->set_current_limit) { 1470 ret = -EINVAL; 1471 goto out; 1472 } 1473 1474 /* constraints check */ 1475 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1476 if (ret < 0) 1477 goto out; 1478 1479 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1480out: 1481 mutex_unlock(&rdev->mutex); 1482 return ret; 1483} 1484EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1485 1486static int _regulator_get_current_limit(struct regulator_dev *rdev) 1487{ 1488 int ret; 1489 1490 mutex_lock(&rdev->mutex); 1491 1492 /* sanity check */ 1493 if (!rdev->desc->ops->get_current_limit) { 1494 ret = -EINVAL; 1495 goto out; 1496 } 1497 1498 ret = rdev->desc->ops->get_current_limit(rdev); 1499out: 1500 mutex_unlock(&rdev->mutex); 1501 return ret; 1502} 1503 1504/** 1505 * regulator_get_current_limit - get regulator output current 1506 * @regulator: regulator source 1507 * 1508 * This returns the current supplied by the specified current sink in uA. 1509 * 1510 * NOTE: If the regulator is disabled it will return the current value. This 1511 * function should not be used to determine regulator state. 1512 */ 1513int regulator_get_current_limit(struct regulator *regulator) 1514{ 1515 return _regulator_get_current_limit(regulator->rdev); 1516} 1517EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1518 1519/** 1520 * regulator_set_mode - set regulator operating mode 1521 * @regulator: regulator source 1522 * @mode: operating mode - one of the REGULATOR_MODE constants 1523 * 1524 * Set regulator operating mode to increase regulator efficiency or improve 1525 * regulation performance. 1526 * 1527 * NOTE: Regulator system constraints must be set for this regulator before 1528 * calling this function otherwise this call will fail. 1529 */ 1530int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1531{ 1532 struct regulator_dev *rdev = regulator->rdev; 1533 int ret; 1534 1535 mutex_lock(&rdev->mutex); 1536 1537 /* sanity check */ 1538 if (!rdev->desc->ops->set_mode) { 1539 ret = -EINVAL; 1540 goto out; 1541 } 1542 1543 /* constraints check */ 1544 ret = regulator_check_mode(rdev, mode); 1545 if (ret < 0) 1546 goto out; 1547 1548 ret = rdev->desc->ops->set_mode(rdev, mode); 1549out: 1550 mutex_unlock(&rdev->mutex); 1551 return ret; 1552} 1553EXPORT_SYMBOL_GPL(regulator_set_mode); 1554 1555static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1556{ 1557 int ret; 1558 1559 mutex_lock(&rdev->mutex); 1560 1561 /* sanity check */ 1562 if (!rdev->desc->ops->get_mode) { 1563 ret = -EINVAL; 1564 goto out; 1565 } 1566 1567 ret = rdev->desc->ops->get_mode(rdev); 1568out: 1569 mutex_unlock(&rdev->mutex); 1570 return ret; 1571} 1572 1573/** 1574 * regulator_get_mode - get regulator operating mode 1575 * @regulator: regulator source 1576 * 1577 * Get the current regulator operating mode. 1578 */ 1579unsigned int regulator_get_mode(struct regulator *regulator) 1580{ 1581 return _regulator_get_mode(regulator->rdev); 1582} 1583EXPORT_SYMBOL_GPL(regulator_get_mode); 1584 1585/** 1586 * regulator_set_optimum_mode - set regulator optimum operating mode 1587 * @regulator: regulator source 1588 * @uA_load: load current 1589 * 1590 * Notifies the regulator core of a new device load. This is then used by 1591 * DRMS (if enabled by constraints) to set the most efficient regulator 1592 * operating mode for the new regulator loading. 1593 * 1594 * Consumer devices notify their supply regulator of the maximum power 1595 * they will require (can be taken from device datasheet in the power 1596 * consumption tables) when they change operational status and hence power 1597 * state. Examples of operational state changes that can affect power 1598 * consumption are :- 1599 * 1600 * o Device is opened / closed. 1601 * o Device I/O is about to begin or has just finished. 1602 * o Device is idling in between work. 1603 * 1604 * This information is also exported via sysfs to userspace. 1605 * 1606 * DRMS will sum the total requested load on the regulator and change 1607 * to the most efficient operating mode if platform constraints allow. 1608 * 1609 * Returns the new regulator mode or error. 1610 */ 1611int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1612{ 1613 struct regulator_dev *rdev = regulator->rdev; 1614 struct regulator *consumer; 1615 int ret, output_uV, input_uV, total_uA_load = 0; 1616 unsigned int mode; 1617 1618 mutex_lock(&rdev->mutex); 1619 1620 regulator->uA_load = uA_load; 1621 ret = regulator_check_drms(rdev); 1622 if (ret < 0) 1623 goto out; 1624 ret = -EINVAL; 1625 1626 /* sanity check */ 1627 if (!rdev->desc->ops->get_optimum_mode) 1628 goto out; 1629 1630 /* get output voltage */ 1631 output_uV = rdev->desc->ops->get_voltage(rdev); 1632 if (output_uV <= 0) { 1633 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1634 __func__, rdev->desc->name); 1635 goto out; 1636 } 1637 1638 /* get input voltage */ 1639 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1640 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1641 else 1642 input_uV = rdev->constraints->input_uV; 1643 if (input_uV <= 0) { 1644 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1645 __func__, rdev->desc->name); 1646 goto out; 1647 } 1648 1649 /* calc total requested load for this regulator */ 1650 list_for_each_entry(consumer, &rdev->consumer_list, list) 1651 total_uA_load += consumer->uA_load; 1652 1653 mode = rdev->desc->ops->get_optimum_mode(rdev, 1654 input_uV, output_uV, 1655 total_uA_load); 1656 ret = regulator_check_mode(rdev, mode); 1657 if (ret < 0) { 1658 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1659 " %d uA %d -> %d uV\n", __func__, rdev->desc->name, 1660 total_uA_load, input_uV, output_uV); 1661 goto out; 1662 } 1663 1664 ret = rdev->desc->ops->set_mode(rdev, mode); 1665 if (ret < 0) { 1666 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1667 __func__, mode, rdev->desc->name); 1668 goto out; 1669 } 1670 ret = mode; 1671out: 1672 mutex_unlock(&rdev->mutex); 1673 return ret; 1674} 1675EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1676 1677/** 1678 * regulator_register_notifier - register regulator event notifier 1679 * @regulator: regulator source 1680 * @nb: notifier block 1681 * 1682 * Register notifier block to receive regulator events. 1683 */ 1684int regulator_register_notifier(struct regulator *regulator, 1685 struct notifier_block *nb) 1686{ 1687 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1688 nb); 1689} 1690EXPORT_SYMBOL_GPL(regulator_register_notifier); 1691 1692/** 1693 * regulator_unregister_notifier - unregister regulator event notifier 1694 * @regulator: regulator source 1695 * @nb: notifier block 1696 * 1697 * Unregister regulator event notifier block. 1698 */ 1699int regulator_unregister_notifier(struct regulator *regulator, 1700 struct notifier_block *nb) 1701{ 1702 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1703 nb); 1704} 1705EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1706 1707/* notify regulator consumers and downstream regulator consumers. 1708 * Note mutex must be held by caller. 1709 */ 1710static void _notifier_call_chain(struct regulator_dev *rdev, 1711 unsigned long event, void *data) 1712{ 1713 struct regulator_dev *_rdev; 1714 1715 /* call rdev chain first */ 1716 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1717 1718 /* now notify regulator we supply */ 1719 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1720 mutex_lock(&_rdev->mutex); 1721 _notifier_call_chain(_rdev, event, data); 1722 mutex_unlock(&_rdev->mutex); 1723 } 1724} 1725 1726/** 1727 * regulator_bulk_get - get multiple regulator consumers 1728 * 1729 * @dev: Device to supply 1730 * @num_consumers: Number of consumers to register 1731 * @consumers: Configuration of consumers; clients are stored here. 1732 * 1733 * @return 0 on success, an errno on failure. 1734 * 1735 * This helper function allows drivers to get several regulator 1736 * consumers in one operation. If any of the regulators cannot be 1737 * acquired then any regulators that were allocated will be freed 1738 * before returning to the caller. 1739 */ 1740int regulator_bulk_get(struct device *dev, int num_consumers, 1741 struct regulator_bulk_data *consumers) 1742{ 1743 int i; 1744 int ret; 1745 1746 for (i = 0; i < num_consumers; i++) 1747 consumers[i].consumer = NULL; 1748 1749 for (i = 0; i < num_consumers; i++) { 1750 consumers[i].consumer = regulator_get(dev, 1751 consumers[i].supply); 1752 if (IS_ERR(consumers[i].consumer)) { 1753 dev_err(dev, "Failed to get supply '%s'\n", 1754 consumers[i].supply); 1755 ret = PTR_ERR(consumers[i].consumer); 1756 consumers[i].consumer = NULL; 1757 goto err; 1758 } 1759 } 1760 1761 return 0; 1762 1763err: 1764 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1765 regulator_put(consumers[i].consumer); 1766 1767 return ret; 1768} 1769EXPORT_SYMBOL_GPL(regulator_bulk_get); 1770 1771/** 1772 * regulator_bulk_enable - enable multiple regulator consumers 1773 * 1774 * @num_consumers: Number of consumers 1775 * @consumers: Consumer data; clients are stored here. 1776 * @return 0 on success, an errno on failure 1777 * 1778 * This convenience API allows consumers to enable multiple regulator 1779 * clients in a single API call. If any consumers cannot be enabled 1780 * then any others that were enabled will be disabled again prior to 1781 * return. 1782 */ 1783int regulator_bulk_enable(int num_consumers, 1784 struct regulator_bulk_data *consumers) 1785{ 1786 int i; 1787 int ret; 1788 1789 for (i = 0; i < num_consumers; i++) { 1790 ret = regulator_enable(consumers[i].consumer); 1791 if (ret != 0) 1792 goto err; 1793 } 1794 1795 return 0; 1796 1797err: 1798 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); 1799 for (i = 0; i < num_consumers; i++) 1800 regulator_disable(consumers[i].consumer); 1801 1802 return ret; 1803} 1804EXPORT_SYMBOL_GPL(regulator_bulk_enable); 1805 1806/** 1807 * regulator_bulk_disable - disable multiple regulator consumers 1808 * 1809 * @num_consumers: Number of consumers 1810 * @consumers: Consumer data; clients are stored here. 1811 * @return 0 on success, an errno on failure 1812 * 1813 * This convenience API allows consumers to disable multiple regulator 1814 * clients in a single API call. If any consumers cannot be enabled 1815 * then any others that were disabled will be disabled again prior to 1816 * return. 1817 */ 1818int regulator_bulk_disable(int num_consumers, 1819 struct regulator_bulk_data *consumers) 1820{ 1821 int i; 1822 int ret; 1823 1824 for (i = 0; i < num_consumers; i++) { 1825 ret = regulator_disable(consumers[i].consumer); 1826 if (ret != 0) 1827 goto err; 1828 } 1829 1830 return 0; 1831 1832err: 1833 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); 1834 for (i = 0; i < num_consumers; i++) 1835 regulator_enable(consumers[i].consumer); 1836 1837 return ret; 1838} 1839EXPORT_SYMBOL_GPL(regulator_bulk_disable); 1840 1841/** 1842 * regulator_bulk_free - free multiple regulator consumers 1843 * 1844 * @num_consumers: Number of consumers 1845 * @consumers: Consumer data; clients are stored here. 1846 * 1847 * This convenience API allows consumers to free multiple regulator 1848 * clients in a single API call. 1849 */ 1850void regulator_bulk_free(int num_consumers, 1851 struct regulator_bulk_data *consumers) 1852{ 1853 int i; 1854 1855 for (i = 0; i < num_consumers; i++) { 1856 regulator_put(consumers[i].consumer); 1857 consumers[i].consumer = NULL; 1858 } 1859} 1860EXPORT_SYMBOL_GPL(regulator_bulk_free); 1861 1862/** 1863 * regulator_notifier_call_chain - call regulator event notifier 1864 * @rdev: regulator source 1865 * @event: notifier block 1866 * @data: callback-specific data. 1867 * 1868 * Called by regulator drivers to notify clients a regulator event has 1869 * occurred. We also notify regulator clients downstream. 1870 * Note lock must be held by caller. 1871 */ 1872int regulator_notifier_call_chain(struct regulator_dev *rdev, 1873 unsigned long event, void *data) 1874{ 1875 _notifier_call_chain(rdev, event, data); 1876 return NOTIFY_DONE; 1877 1878} 1879EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 1880 1881/* 1882 * To avoid cluttering sysfs (and memory) with useless state, only 1883 * create attributes that can be meaningfully displayed. 1884 */ 1885static int add_regulator_attributes(struct regulator_dev *rdev) 1886{ 1887 struct device *dev = &rdev->dev; 1888 struct regulator_ops *ops = rdev->desc->ops; 1889 int status = 0; 1890 1891 /* some attributes need specific methods to be displayed */ 1892 if (ops->get_voltage) { 1893 status = device_create_file(dev, &dev_attr_microvolts); 1894 if (status < 0) 1895 return status; 1896 } 1897 if (ops->get_current_limit) { 1898 status = device_create_file(dev, &dev_attr_microamps); 1899 if (status < 0) 1900 return status; 1901 } 1902 if (ops->get_mode) { 1903 status = device_create_file(dev, &dev_attr_opmode); 1904 if (status < 0) 1905 return status; 1906 } 1907 if (ops->is_enabled) { 1908 status = device_create_file(dev, &dev_attr_state); 1909 if (status < 0) 1910 return status; 1911 } 1912 if (ops->get_status) { 1913 status = device_create_file(dev, &dev_attr_status); 1914 if (status < 0) 1915 return status; 1916 } 1917 1918 /* some attributes are type-specific */ 1919 if (rdev->desc->type == REGULATOR_CURRENT) { 1920 status = device_create_file(dev, &dev_attr_requested_microamps); 1921 if (status < 0) 1922 return status; 1923 } 1924 1925 /* all the other attributes exist to support constraints; 1926 * don't show them if there are no constraints, or if the 1927 * relevant supporting methods are missing. 1928 */ 1929 if (!rdev->constraints) 1930 return status; 1931 1932 /* constraints need specific supporting methods */ 1933 if (ops->set_voltage) { 1934 status = device_create_file(dev, &dev_attr_min_microvolts); 1935 if (status < 0) 1936 return status; 1937 status = device_create_file(dev, &dev_attr_max_microvolts); 1938 if (status < 0) 1939 return status; 1940 } 1941 if (ops->set_current_limit) { 1942 status = device_create_file(dev, &dev_attr_min_microamps); 1943 if (status < 0) 1944 return status; 1945 status = device_create_file(dev, &dev_attr_max_microamps); 1946 if (status < 0) 1947 return status; 1948 } 1949 1950 /* suspend mode constraints need multiple supporting methods */ 1951 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 1952 return status; 1953 1954 status = device_create_file(dev, &dev_attr_suspend_standby_state); 1955 if (status < 0) 1956 return status; 1957 status = device_create_file(dev, &dev_attr_suspend_mem_state); 1958 if (status < 0) 1959 return status; 1960 status = device_create_file(dev, &dev_attr_suspend_disk_state); 1961 if (status < 0) 1962 return status; 1963 1964 if (ops->set_suspend_voltage) { 1965 status = device_create_file(dev, 1966 &dev_attr_suspend_standby_microvolts); 1967 if (status < 0) 1968 return status; 1969 status = device_create_file(dev, 1970 &dev_attr_suspend_mem_microvolts); 1971 if (status < 0) 1972 return status; 1973 status = device_create_file(dev, 1974 &dev_attr_suspend_disk_microvolts); 1975 if (status < 0) 1976 return status; 1977 } 1978 1979 if (ops->set_suspend_mode) { 1980 status = device_create_file(dev, 1981 &dev_attr_suspend_standby_mode); 1982 if (status < 0) 1983 return status; 1984 status = device_create_file(dev, 1985 &dev_attr_suspend_mem_mode); 1986 if (status < 0) 1987 return status; 1988 status = device_create_file(dev, 1989 &dev_attr_suspend_disk_mode); 1990 if (status < 0) 1991 return status; 1992 } 1993 1994 return status; 1995} 1996 1997/** 1998 * regulator_register - register regulator 1999 * @regulator_desc: regulator to register 2000 * @dev: struct device for the regulator 2001 * @init_data: platform provided init data, passed through by driver 2002 * @driver_data: private regulator data 2003 * 2004 * Called by regulator drivers to register a regulator. 2005 * Returns 0 on success. 2006 */ 2007struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2008 struct device *dev, struct regulator_init_data *init_data, 2009 void *driver_data) 2010{ 2011 static atomic_t regulator_no = ATOMIC_INIT(0); 2012 struct regulator_dev *rdev; 2013 int ret, i; 2014 2015 if (regulator_desc == NULL) 2016 return ERR_PTR(-EINVAL); 2017 2018 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2019 return ERR_PTR(-EINVAL); 2020 2021 if (!regulator_desc->type == REGULATOR_VOLTAGE && 2022 !regulator_desc->type == REGULATOR_CURRENT) 2023 return ERR_PTR(-EINVAL); 2024 2025 if (!init_data) 2026 return ERR_PTR(-EINVAL); 2027 2028 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2029 if (rdev == NULL) 2030 return ERR_PTR(-ENOMEM); 2031 2032 mutex_lock(®ulator_list_mutex); 2033 2034 mutex_init(&rdev->mutex); 2035 rdev->reg_data = driver_data; 2036 rdev->owner = regulator_desc->owner; 2037 rdev->desc = regulator_desc; 2038 INIT_LIST_HEAD(&rdev->consumer_list); 2039 INIT_LIST_HEAD(&rdev->supply_list); 2040 INIT_LIST_HEAD(&rdev->list); 2041 INIT_LIST_HEAD(&rdev->slist); 2042 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2043 2044 /* preform any regulator specific init */ 2045 if (init_data->regulator_init) { 2046 ret = init_data->regulator_init(rdev->reg_data); 2047 if (ret < 0) 2048 goto clean; 2049 } 2050 2051 /* register with sysfs */ 2052 rdev->dev.class = ®ulator_class; 2053 rdev->dev.parent = dev; 2054 dev_set_name(&rdev->dev, "regulator.%d", 2055 atomic_inc_return(®ulator_no) - 1); 2056 ret = device_register(&rdev->dev); 2057 if (ret != 0) 2058 goto clean; 2059 2060 dev_set_drvdata(&rdev->dev, rdev); 2061 2062 /* set regulator constraints */ 2063 ret = set_machine_constraints(rdev, &init_data->constraints); 2064 if (ret < 0) 2065 goto scrub; 2066 2067 /* add attributes supported by this regulator */ 2068 ret = add_regulator_attributes(rdev); 2069 if (ret < 0) 2070 goto scrub; 2071 2072 /* set supply regulator if it exists */ 2073 if (init_data->supply_regulator_dev) { 2074 ret = set_supply(rdev, 2075 dev_get_drvdata(init_data->supply_regulator_dev)); 2076 if (ret < 0) 2077 goto scrub; 2078 } 2079 2080 /* add consumers devices */ 2081 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2082 ret = set_consumer_device_supply(rdev, 2083 init_data->consumer_supplies[i].dev, 2084 init_data->consumer_supplies[i].supply); 2085 if (ret < 0) { 2086 for (--i; i >= 0; i--) 2087 unset_consumer_device_supply(rdev, 2088 init_data->consumer_supplies[i].dev); 2089 goto scrub; 2090 } 2091 } 2092 2093 list_add(&rdev->list, ®ulator_list); 2094out: 2095 mutex_unlock(®ulator_list_mutex); 2096 return rdev; 2097 2098scrub: 2099 device_unregister(&rdev->dev); 2100clean: 2101 kfree(rdev); 2102 rdev = ERR_PTR(ret); 2103 goto out; 2104} 2105EXPORT_SYMBOL_GPL(regulator_register); 2106 2107/** 2108 * regulator_unregister - unregister regulator 2109 * @rdev: regulator to unregister 2110 * 2111 * Called by regulator drivers to unregister a regulator. 2112 */ 2113void regulator_unregister(struct regulator_dev *rdev) 2114{ 2115 if (rdev == NULL) 2116 return; 2117 2118 mutex_lock(®ulator_list_mutex); 2119 unset_regulator_supplies(rdev); 2120 list_del(&rdev->list); 2121 if (rdev->supply) 2122 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2123 device_unregister(&rdev->dev); 2124 mutex_unlock(®ulator_list_mutex); 2125} 2126EXPORT_SYMBOL_GPL(regulator_unregister); 2127 2128/** 2129 * regulator_suspend_prepare - prepare regulators for system wide suspend 2130 * @state: system suspend state 2131 * 2132 * Configure each regulator with it's suspend operating parameters for state. 2133 * This will usually be called by machine suspend code prior to supending. 2134 */ 2135int regulator_suspend_prepare(suspend_state_t state) 2136{ 2137 struct regulator_dev *rdev; 2138 int ret = 0; 2139 2140 /* ON is handled by regulator active state */ 2141 if (state == PM_SUSPEND_ON) 2142 return -EINVAL; 2143 2144 mutex_lock(®ulator_list_mutex); 2145 list_for_each_entry(rdev, ®ulator_list, list) { 2146 2147 mutex_lock(&rdev->mutex); 2148 ret = suspend_prepare(rdev, state); 2149 mutex_unlock(&rdev->mutex); 2150 2151 if (ret < 0) { 2152 printk(KERN_ERR "%s: failed to prepare %s\n", 2153 __func__, rdev->desc->name); 2154 goto out; 2155 } 2156 } 2157out: 2158 mutex_unlock(®ulator_list_mutex); 2159 return ret; 2160} 2161EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2162 2163/** 2164 * rdev_get_drvdata - get rdev regulator driver data 2165 * @rdev: regulator 2166 * 2167 * Get rdev regulator driver private data. This call can be used in the 2168 * regulator driver context. 2169 */ 2170void *rdev_get_drvdata(struct regulator_dev *rdev) 2171{ 2172 return rdev->reg_data; 2173} 2174EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2175 2176/** 2177 * regulator_get_drvdata - get regulator driver data 2178 * @regulator: regulator 2179 * 2180 * Get regulator driver private data. This call can be used in the consumer 2181 * driver context when non API regulator specific functions need to be called. 2182 */ 2183void *regulator_get_drvdata(struct regulator *regulator) 2184{ 2185 return regulator->rdev->reg_data; 2186} 2187EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2188 2189/** 2190 * regulator_set_drvdata - set regulator driver data 2191 * @regulator: regulator 2192 * @data: data 2193 */ 2194void regulator_set_drvdata(struct regulator *regulator, void *data) 2195{ 2196 regulator->rdev->reg_data = data; 2197} 2198EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2199 2200/** 2201 * regulator_get_id - get regulator ID 2202 * @rdev: regulator 2203 */ 2204int rdev_get_id(struct regulator_dev *rdev) 2205{ 2206 return rdev->desc->id; 2207} 2208EXPORT_SYMBOL_GPL(rdev_get_id); 2209 2210struct device *rdev_get_dev(struct regulator_dev *rdev) 2211{ 2212 return &rdev->dev; 2213} 2214EXPORT_SYMBOL_GPL(rdev_get_dev); 2215 2216void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2217{ 2218 return reg_init_data->driver_data; 2219} 2220EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2221 2222static int __init regulator_init(void) 2223{ 2224 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2225 return class_register(®ulator_class); 2226} 2227 2228/* init early to allow our consumers to complete system booting */ 2229core_initcall(regulator_init); 2230