core.c revision 40f9244f4da8976eeb6d5ed6313c635ba238a9d3
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); 31static int has_full_constraints; 32 33/* 34 * struct regulator_map 35 * 36 * Used to provide symbolic supply names to devices. 37 */ 38struct regulator_map { 39 struct list_head list; 40 const char *dev_name; /* The dev_name() for the consumer */ 41 const char *supply; 42 struct regulator_dev *regulator; 43}; 44 45/* 46 * struct regulator 47 * 48 * One for each consumer device. 49 */ 50struct regulator { 51 struct device *dev; 52 struct list_head list; 53 int uA_load; 54 int min_uV; 55 int max_uV; 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 and the constraints are used by list_voltage. */ 708 if (count == 1 && !cmin) { 709 cmin = 1; 710 cmax = INT_MAX; 711 constraints->min_uV = cmin; 712 constraints->max_uV = cmax; 713 } 714 715 /* voltage constraints are optional */ 716 if ((cmin == 0) && (cmax == 0)) 717 goto out; 718 719 /* else require explicit machine-level constraints */ 720 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 721 pr_err("%s: %s '%s' voltage constraints\n", 722 __func__, "invalid", name); 723 ret = -EINVAL; 724 goto out; 725 } 726 727 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 728 for (i = 0; i < count; i++) { 729 int value; 730 731 value = ops->list_voltage(rdev, i); 732 if (value <= 0) 733 continue; 734 735 /* maybe adjust [min_uV..max_uV] */ 736 if (value >= cmin && value < min_uV) 737 min_uV = value; 738 if (value <= cmax && value > max_uV) 739 max_uV = value; 740 } 741 742 /* final: [min_uV..max_uV] valid iff constraints valid */ 743 if (max_uV < min_uV) { 744 pr_err("%s: %s '%s' voltage constraints\n", 745 __func__, "unsupportable", name); 746 ret = -EINVAL; 747 goto out; 748 } 749 750 /* use regulator's subset of machine constraints */ 751 if (constraints->min_uV < min_uV) { 752 pr_debug("%s: override '%s' %s, %d -> %d\n", 753 __func__, name, "min_uV", 754 constraints->min_uV, min_uV); 755 constraints->min_uV = min_uV; 756 } 757 if (constraints->max_uV > max_uV) { 758 pr_debug("%s: override '%s' %s, %d -> %d\n", 759 __func__, name, "max_uV", 760 constraints->max_uV, max_uV); 761 constraints->max_uV = max_uV; 762 } 763 } 764 765 rdev->constraints = constraints; 766 767 /* do we need to apply the constraint voltage */ 768 if (rdev->constraints->apply_uV && 769 rdev->constraints->min_uV == rdev->constraints->max_uV && 770 ops->set_voltage) { 771 ret = ops->set_voltage(rdev, 772 rdev->constraints->min_uV, rdev->constraints->max_uV); 773 if (ret < 0) { 774 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 775 __func__, 776 rdev->constraints->min_uV, name); 777 rdev->constraints = NULL; 778 goto out; 779 } 780 } 781 782 /* do we need to setup our suspend state */ 783 if (constraints->initial_state) { 784 ret = suspend_prepare(rdev, constraints->initial_state); 785 if (ret < 0) { 786 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 787 __func__, name); 788 rdev->constraints = NULL; 789 goto out; 790 } 791 } 792 793 if (constraints->initial_mode) { 794 if (!ops->set_mode) { 795 printk(KERN_ERR "%s: no set_mode operation for %s\n", 796 __func__, name); 797 ret = -EINVAL; 798 goto out; 799 } 800 801 ret = ops->set_mode(rdev, constraints->initial_mode); 802 if (ret < 0) { 803 printk(KERN_ERR 804 "%s: failed to set initial mode for %s: %d\n", 805 __func__, name, ret); 806 goto out; 807 } 808 } 809 810 /* If the constraints say the regulator should be on at this point 811 * and we have control then make sure it is enabled. 812 */ 813 if ((constraints->always_on || constraints->boot_on) && ops->enable) { 814 ret = ops->enable(rdev); 815 if (ret < 0) { 816 printk(KERN_ERR "%s: failed to enable %s\n", 817 __func__, name); 818 rdev->constraints = NULL; 819 goto out; 820 } 821 } 822 823 print_constraints(rdev); 824out: 825 return ret; 826} 827 828/** 829 * set_supply - set regulator supply regulator 830 * @rdev: regulator name 831 * @supply_rdev: supply regulator name 832 * 833 * Called by platform initialisation code to set the supply regulator for this 834 * regulator. This ensures that a regulators supply will also be enabled by the 835 * core if it's child is enabled. 836 */ 837static int set_supply(struct regulator_dev *rdev, 838 struct regulator_dev *supply_rdev) 839{ 840 int err; 841 842 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 843 "supply"); 844 if (err) { 845 printk(KERN_ERR 846 "%s: could not add device link %s err %d\n", 847 __func__, supply_rdev->dev.kobj.name, err); 848 goto out; 849 } 850 rdev->supply = supply_rdev; 851 list_add(&rdev->slist, &supply_rdev->supply_list); 852out: 853 return err; 854} 855 856/** 857 * set_consumer_device_supply: Bind a regulator to a symbolic supply 858 * @rdev: regulator source 859 * @consumer_dev: device the supply applies to 860 * @consumer_dev_name: dev_name() string for device supply applies to 861 * @supply: symbolic name for supply 862 * 863 * Allows platform initialisation code to map physical regulator 864 * sources to symbolic names for supplies for use by devices. Devices 865 * should use these symbolic names to request regulators, avoiding the 866 * need to provide board-specific regulator names as platform data. 867 * 868 * Only one of consumer_dev and consumer_dev_name may be specified. 869 */ 870static int set_consumer_device_supply(struct regulator_dev *rdev, 871 struct device *consumer_dev, const char *consumer_dev_name, 872 const char *supply) 873{ 874 struct regulator_map *node; 875 876 if (consumer_dev && consumer_dev_name) 877 return -EINVAL; 878 879 if (!consumer_dev_name && consumer_dev) 880 consumer_dev_name = dev_name(consumer_dev); 881 882 if (supply == NULL) 883 return -EINVAL; 884 885 list_for_each_entry(node, ®ulator_map_list, list) { 886 if (consumer_dev_name != node->dev_name) 887 continue; 888 if (strcmp(node->supply, supply) != 0) 889 continue; 890 891 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 892 dev_name(&node->regulator->dev), 893 node->regulator->desc->name, 894 supply, 895 dev_name(&rdev->dev), rdev->desc->name); 896 return -EBUSY; 897 } 898 899 node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL); 900 if (node == NULL) 901 return -ENOMEM; 902 903 node->regulator = rdev; 904 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 905 node->supply = supply; 906 907 if (node->dev_name == NULL) { 908 kfree(node); 909 return -ENOMEM; 910 } 911 912 list_add(&node->list, ®ulator_map_list); 913 return 0; 914} 915 916static void unset_consumer_device_supply(struct regulator_dev *rdev, 917 const char *consumer_dev_name, struct device *consumer_dev) 918{ 919 struct regulator_map *node, *n; 920 921 if (consumer_dev && !consumer_dev_name) 922 consumer_dev_name = dev_name(consumer_dev); 923 924 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 925 if (rdev != node->regulator) 926 continue; 927 928 if (consumer_dev_name && node->dev_name && 929 strcmp(consumer_dev_name, node->dev_name)) 930 continue; 931 932 list_del(&node->list); 933 kfree(node->dev_name); 934 kfree(node); 935 return; 936 } 937} 938 939static void unset_regulator_supplies(struct regulator_dev *rdev) 940{ 941 struct regulator_map *node, *n; 942 943 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 944 if (rdev == node->regulator) { 945 list_del(&node->list); 946 kfree(node->dev_name); 947 kfree(node); 948 return; 949 } 950 } 951} 952 953#define REG_STR_SIZE 32 954 955static struct regulator *create_regulator(struct regulator_dev *rdev, 956 struct device *dev, 957 const char *supply_name) 958{ 959 struct regulator *regulator; 960 char buf[REG_STR_SIZE]; 961 int err, size; 962 963 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 964 if (regulator == NULL) 965 return NULL; 966 967 mutex_lock(&rdev->mutex); 968 regulator->rdev = rdev; 969 list_add(®ulator->list, &rdev->consumer_list); 970 971 if (dev) { 972 /* create a 'requested_microamps_name' sysfs entry */ 973 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 974 supply_name); 975 if (size >= REG_STR_SIZE) 976 goto overflow_err; 977 978 regulator->dev = dev; 979 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 980 if (regulator->dev_attr.attr.name == NULL) 981 goto attr_name_err; 982 983 regulator->dev_attr.attr.owner = THIS_MODULE; 984 regulator->dev_attr.attr.mode = 0444; 985 regulator->dev_attr.show = device_requested_uA_show; 986 err = device_create_file(dev, ®ulator->dev_attr); 987 if (err < 0) { 988 printk(KERN_WARNING "%s: could not add regulator_dev" 989 " load sysfs\n", __func__); 990 goto attr_name_err; 991 } 992 993 /* also add a link to the device sysfs entry */ 994 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 995 dev->kobj.name, supply_name); 996 if (size >= REG_STR_SIZE) 997 goto attr_err; 998 999 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1000 if (regulator->supply_name == NULL) 1001 goto attr_err; 1002 1003 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1004 buf); 1005 if (err) { 1006 printk(KERN_WARNING 1007 "%s: could not add device link %s err %d\n", 1008 __func__, dev->kobj.name, err); 1009 device_remove_file(dev, ®ulator->dev_attr); 1010 goto link_name_err; 1011 } 1012 } 1013 mutex_unlock(&rdev->mutex); 1014 return regulator; 1015link_name_err: 1016 kfree(regulator->supply_name); 1017attr_err: 1018 device_remove_file(regulator->dev, ®ulator->dev_attr); 1019attr_name_err: 1020 kfree(regulator->dev_attr.attr.name); 1021overflow_err: 1022 list_del(®ulator->list); 1023 kfree(regulator); 1024 mutex_unlock(&rdev->mutex); 1025 return NULL; 1026} 1027 1028/** 1029 * regulator_get - lookup and obtain a reference to a regulator. 1030 * @dev: device for regulator "consumer" 1031 * @id: Supply name or regulator ID. 1032 * 1033 * Returns a struct regulator corresponding to the regulator producer, 1034 * or IS_ERR() condition containing errno. 1035 * 1036 * Use of supply names configured via regulator_set_device_supply() is 1037 * strongly encouraged. It is recommended that the supply name used 1038 * should match the name used for the supply and/or the relevant 1039 * device pins in the datasheet. 1040 */ 1041struct regulator *regulator_get(struct device *dev, const char *id) 1042{ 1043 struct regulator_dev *rdev; 1044 struct regulator_map *map; 1045 struct regulator *regulator = ERR_PTR(-ENODEV); 1046 const char *devname = NULL; 1047 1048 if (id == NULL) { 1049 printk(KERN_ERR "regulator: get() with no identifier\n"); 1050 return regulator; 1051 } 1052 1053 if (dev) 1054 devname = dev_name(dev); 1055 1056 mutex_lock(®ulator_list_mutex); 1057 1058 list_for_each_entry(map, ®ulator_map_list, list) { 1059 /* If the mapping has a device set up it must match */ 1060 if (map->dev_name && 1061 (!devname || strcmp(map->dev_name, devname))) 1062 continue; 1063 1064 if (strcmp(map->supply, id) == 0) { 1065 rdev = map->regulator; 1066 goto found; 1067 } 1068 } 1069 mutex_unlock(®ulator_list_mutex); 1070 return regulator; 1071 1072found: 1073 if (!try_module_get(rdev->owner)) 1074 goto out; 1075 1076 regulator = create_regulator(rdev, dev, id); 1077 if (regulator == NULL) { 1078 regulator = ERR_PTR(-ENOMEM); 1079 module_put(rdev->owner); 1080 } 1081 1082out: 1083 mutex_unlock(®ulator_list_mutex); 1084 return regulator; 1085} 1086EXPORT_SYMBOL_GPL(regulator_get); 1087 1088/** 1089 * regulator_put - "free" the regulator source 1090 * @regulator: regulator source 1091 * 1092 * Note: drivers must ensure that all regulator_enable calls made on this 1093 * regulator source are balanced by regulator_disable calls prior to calling 1094 * this function. 1095 */ 1096void regulator_put(struct regulator *regulator) 1097{ 1098 struct regulator_dev *rdev; 1099 1100 if (regulator == NULL || IS_ERR(regulator)) 1101 return; 1102 1103 mutex_lock(®ulator_list_mutex); 1104 rdev = regulator->rdev; 1105 1106 /* remove any sysfs entries */ 1107 if (regulator->dev) { 1108 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1109 kfree(regulator->supply_name); 1110 device_remove_file(regulator->dev, ®ulator->dev_attr); 1111 kfree(regulator->dev_attr.attr.name); 1112 } 1113 list_del(®ulator->list); 1114 kfree(regulator); 1115 1116 module_put(rdev->owner); 1117 mutex_unlock(®ulator_list_mutex); 1118} 1119EXPORT_SYMBOL_GPL(regulator_put); 1120 1121/* locks held by regulator_enable() */ 1122static int _regulator_enable(struct regulator_dev *rdev) 1123{ 1124 int ret = -EINVAL; 1125 1126 if (!rdev->constraints) { 1127 printk(KERN_ERR "%s: %s has no constraints\n", 1128 __func__, rdev->desc->name); 1129 return ret; 1130 } 1131 1132 /* do we need to enable the supply regulator first */ 1133 if (rdev->supply) { 1134 ret = _regulator_enable(rdev->supply); 1135 if (ret < 0) { 1136 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1137 __func__, rdev->desc->name, ret); 1138 return ret; 1139 } 1140 } 1141 1142 /* check voltage and requested load before enabling */ 1143 if (rdev->desc->ops->enable) { 1144 1145 if (rdev->constraints && 1146 (rdev->constraints->valid_ops_mask & 1147 REGULATOR_CHANGE_DRMS)) 1148 drms_uA_update(rdev); 1149 1150 ret = rdev->desc->ops->enable(rdev); 1151 if (ret < 0) { 1152 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1153 __func__, rdev->desc->name, ret); 1154 return ret; 1155 } 1156 rdev->use_count++; 1157 return ret; 1158 } 1159 1160 return ret; 1161} 1162 1163/** 1164 * regulator_enable - enable regulator output 1165 * @regulator: regulator source 1166 * 1167 * Request that the regulator be enabled with the regulator output at 1168 * the predefined voltage or current value. Calls to regulator_enable() 1169 * must be balanced with calls to regulator_disable(). 1170 * 1171 * NOTE: the output value can be set by other drivers, boot loader or may be 1172 * hardwired in the regulator. 1173 */ 1174int regulator_enable(struct regulator *regulator) 1175{ 1176 struct regulator_dev *rdev = regulator->rdev; 1177 int ret = 0; 1178 1179 mutex_lock(&rdev->mutex); 1180 ret = _regulator_enable(rdev); 1181 mutex_unlock(&rdev->mutex); 1182 return ret; 1183} 1184EXPORT_SYMBOL_GPL(regulator_enable); 1185 1186/* locks held by regulator_disable() */ 1187static int _regulator_disable(struct regulator_dev *rdev) 1188{ 1189 int ret = 0; 1190 1191 if (WARN(rdev->use_count <= 0, 1192 "unbalanced disables for %s\n", 1193 rdev->desc->name)) 1194 return -EIO; 1195 1196 /* are we the last user and permitted to disable ? */ 1197 if (rdev->use_count == 1 && !rdev->constraints->always_on) { 1198 1199 /* we are last user */ 1200 if (rdev->desc->ops->disable) { 1201 ret = rdev->desc->ops->disable(rdev); 1202 if (ret < 0) { 1203 printk(KERN_ERR "%s: failed to disable %s\n", 1204 __func__, rdev->desc->name); 1205 return ret; 1206 } 1207 } 1208 1209 /* decrease our supplies ref count and disable if required */ 1210 if (rdev->supply) 1211 _regulator_disable(rdev->supply); 1212 1213 rdev->use_count = 0; 1214 } else if (rdev->use_count > 1) { 1215 1216 if (rdev->constraints && 1217 (rdev->constraints->valid_ops_mask & 1218 REGULATOR_CHANGE_DRMS)) 1219 drms_uA_update(rdev); 1220 1221 rdev->use_count--; 1222 } 1223 return ret; 1224} 1225 1226/** 1227 * regulator_disable - disable regulator output 1228 * @regulator: regulator source 1229 * 1230 * Disable the regulator output voltage or current. Calls to 1231 * regulator_enable() must be balanced with calls to 1232 * regulator_disable(). 1233 * 1234 * NOTE: this will only disable the regulator output if no other consumer 1235 * devices have it enabled, the regulator device supports disabling and 1236 * machine constraints permit this operation. 1237 */ 1238int regulator_disable(struct regulator *regulator) 1239{ 1240 struct regulator_dev *rdev = regulator->rdev; 1241 int ret = 0; 1242 1243 mutex_lock(&rdev->mutex); 1244 ret = _regulator_disable(rdev); 1245 mutex_unlock(&rdev->mutex); 1246 return ret; 1247} 1248EXPORT_SYMBOL_GPL(regulator_disable); 1249 1250/* locks held by regulator_force_disable() */ 1251static int _regulator_force_disable(struct regulator_dev *rdev) 1252{ 1253 int ret = 0; 1254 1255 /* force disable */ 1256 if (rdev->desc->ops->disable) { 1257 /* ah well, who wants to live forever... */ 1258 ret = rdev->desc->ops->disable(rdev); 1259 if (ret < 0) { 1260 printk(KERN_ERR "%s: failed to force disable %s\n", 1261 __func__, rdev->desc->name); 1262 return ret; 1263 } 1264 /* notify other consumers that power has been forced off */ 1265 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE, 1266 NULL); 1267 } 1268 1269 /* decrease our supplies ref count and disable if required */ 1270 if (rdev->supply) 1271 _regulator_disable(rdev->supply); 1272 1273 rdev->use_count = 0; 1274 return ret; 1275} 1276 1277/** 1278 * regulator_force_disable - force disable regulator output 1279 * @regulator: regulator source 1280 * 1281 * Forcibly disable the regulator output voltage or current. 1282 * NOTE: this *will* disable the regulator output even if other consumer 1283 * devices have it enabled. This should be used for situations when device 1284 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1285 */ 1286int regulator_force_disable(struct regulator *regulator) 1287{ 1288 int ret; 1289 1290 mutex_lock(®ulator->rdev->mutex); 1291 regulator->uA_load = 0; 1292 ret = _regulator_force_disable(regulator->rdev); 1293 mutex_unlock(®ulator->rdev->mutex); 1294 return ret; 1295} 1296EXPORT_SYMBOL_GPL(regulator_force_disable); 1297 1298static int _regulator_is_enabled(struct regulator_dev *rdev) 1299{ 1300 int ret; 1301 1302 mutex_lock(&rdev->mutex); 1303 1304 /* sanity check */ 1305 if (!rdev->desc->ops->is_enabled) { 1306 ret = -EINVAL; 1307 goto out; 1308 } 1309 1310 ret = rdev->desc->ops->is_enabled(rdev); 1311out: 1312 mutex_unlock(&rdev->mutex); 1313 return ret; 1314} 1315 1316/** 1317 * regulator_is_enabled - is the regulator output enabled 1318 * @regulator: regulator source 1319 * 1320 * Returns positive if the regulator driver backing the source/client 1321 * has requested that the device be enabled, zero if it hasn't, else a 1322 * negative errno code. 1323 * 1324 * Note that the device backing this regulator handle can have multiple 1325 * users, so it might be enabled even if regulator_enable() was never 1326 * called for this particular source. 1327 */ 1328int regulator_is_enabled(struct regulator *regulator) 1329{ 1330 return _regulator_is_enabled(regulator->rdev); 1331} 1332EXPORT_SYMBOL_GPL(regulator_is_enabled); 1333 1334/** 1335 * regulator_count_voltages - count regulator_list_voltage() selectors 1336 * @regulator: regulator source 1337 * 1338 * Returns number of selectors, or negative errno. Selectors are 1339 * numbered starting at zero, and typically correspond to bitfields 1340 * in hardware registers. 1341 */ 1342int regulator_count_voltages(struct regulator *regulator) 1343{ 1344 struct regulator_dev *rdev = regulator->rdev; 1345 1346 return rdev->desc->n_voltages ? : -EINVAL; 1347} 1348EXPORT_SYMBOL_GPL(regulator_count_voltages); 1349 1350/** 1351 * regulator_list_voltage - enumerate supported voltages 1352 * @regulator: regulator source 1353 * @selector: identify voltage to list 1354 * Context: can sleep 1355 * 1356 * Returns a voltage that can be passed to @regulator_set_voltage(), 1357 * zero if this selector code can't be used on this sytem, or a 1358 * negative errno. 1359 */ 1360int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1361{ 1362 struct regulator_dev *rdev = regulator->rdev; 1363 struct regulator_ops *ops = rdev->desc->ops; 1364 int ret; 1365 1366 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1367 return -EINVAL; 1368 1369 mutex_lock(&rdev->mutex); 1370 ret = ops->list_voltage(rdev, selector); 1371 mutex_unlock(&rdev->mutex); 1372 1373 if (ret > 0) { 1374 if (ret < rdev->constraints->min_uV) 1375 ret = 0; 1376 else if (ret > rdev->constraints->max_uV) 1377 ret = 0; 1378 } 1379 1380 return ret; 1381} 1382EXPORT_SYMBOL_GPL(regulator_list_voltage); 1383 1384/** 1385 * regulator_set_voltage - set regulator output voltage 1386 * @regulator: regulator source 1387 * @min_uV: Minimum required voltage in uV 1388 * @max_uV: Maximum acceptable voltage in uV 1389 * 1390 * Sets a voltage regulator to the desired output voltage. This can be set 1391 * during any regulator state. IOW, regulator can be disabled or enabled. 1392 * 1393 * If the regulator is enabled then the voltage will change to the new value 1394 * immediately otherwise if the regulator is disabled the regulator will 1395 * output at the new voltage when enabled. 1396 * 1397 * NOTE: If the regulator is shared between several devices then the lowest 1398 * request voltage that meets the system constraints will be used. 1399 * Regulator system constraints must be set for this regulator before 1400 * calling this function otherwise this call will fail. 1401 */ 1402int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1403{ 1404 struct regulator_dev *rdev = regulator->rdev; 1405 int ret; 1406 1407 mutex_lock(&rdev->mutex); 1408 1409 /* sanity check */ 1410 if (!rdev->desc->ops->set_voltage) { 1411 ret = -EINVAL; 1412 goto out; 1413 } 1414 1415 /* constraints check */ 1416 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1417 if (ret < 0) 1418 goto out; 1419 regulator->min_uV = min_uV; 1420 regulator->max_uV = max_uV; 1421 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1422 1423out: 1424 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1425 mutex_unlock(&rdev->mutex); 1426 return ret; 1427} 1428EXPORT_SYMBOL_GPL(regulator_set_voltage); 1429 1430static int _regulator_get_voltage(struct regulator_dev *rdev) 1431{ 1432 /* sanity check */ 1433 if (rdev->desc->ops->get_voltage) 1434 return rdev->desc->ops->get_voltage(rdev); 1435 else 1436 return -EINVAL; 1437} 1438 1439/** 1440 * regulator_get_voltage - get regulator output voltage 1441 * @regulator: regulator source 1442 * 1443 * This returns the current regulator voltage in uV. 1444 * 1445 * NOTE: If the regulator is disabled it will return the voltage value. This 1446 * function should not be used to determine regulator state. 1447 */ 1448int regulator_get_voltage(struct regulator *regulator) 1449{ 1450 int ret; 1451 1452 mutex_lock(®ulator->rdev->mutex); 1453 1454 ret = _regulator_get_voltage(regulator->rdev); 1455 1456 mutex_unlock(®ulator->rdev->mutex); 1457 1458 return ret; 1459} 1460EXPORT_SYMBOL_GPL(regulator_get_voltage); 1461 1462/** 1463 * regulator_set_current_limit - set regulator output current limit 1464 * @regulator: regulator source 1465 * @min_uA: Minimuum supported current in uA 1466 * @max_uA: Maximum supported current in uA 1467 * 1468 * Sets current sink to the desired output current. This can be set during 1469 * any regulator state. IOW, regulator can be disabled or enabled. 1470 * 1471 * If the regulator is enabled then the current will change to the new value 1472 * immediately otherwise if the regulator is disabled the regulator will 1473 * output at the new current when enabled. 1474 * 1475 * NOTE: Regulator system constraints must be set for this regulator before 1476 * calling this function otherwise this call will fail. 1477 */ 1478int regulator_set_current_limit(struct regulator *regulator, 1479 int min_uA, int max_uA) 1480{ 1481 struct regulator_dev *rdev = regulator->rdev; 1482 int ret; 1483 1484 mutex_lock(&rdev->mutex); 1485 1486 /* sanity check */ 1487 if (!rdev->desc->ops->set_current_limit) { 1488 ret = -EINVAL; 1489 goto out; 1490 } 1491 1492 /* constraints check */ 1493 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1494 if (ret < 0) 1495 goto out; 1496 1497 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1498out: 1499 mutex_unlock(&rdev->mutex); 1500 return ret; 1501} 1502EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1503 1504static int _regulator_get_current_limit(struct regulator_dev *rdev) 1505{ 1506 int ret; 1507 1508 mutex_lock(&rdev->mutex); 1509 1510 /* sanity check */ 1511 if (!rdev->desc->ops->get_current_limit) { 1512 ret = -EINVAL; 1513 goto out; 1514 } 1515 1516 ret = rdev->desc->ops->get_current_limit(rdev); 1517out: 1518 mutex_unlock(&rdev->mutex); 1519 return ret; 1520} 1521 1522/** 1523 * regulator_get_current_limit - get regulator output current 1524 * @regulator: regulator source 1525 * 1526 * This returns the current supplied by the specified current sink in uA. 1527 * 1528 * NOTE: If the regulator is disabled it will return the current value. This 1529 * function should not be used to determine regulator state. 1530 */ 1531int regulator_get_current_limit(struct regulator *regulator) 1532{ 1533 return _regulator_get_current_limit(regulator->rdev); 1534} 1535EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1536 1537/** 1538 * regulator_set_mode - set regulator operating mode 1539 * @regulator: regulator source 1540 * @mode: operating mode - one of the REGULATOR_MODE constants 1541 * 1542 * Set regulator operating mode to increase regulator efficiency or improve 1543 * regulation performance. 1544 * 1545 * NOTE: Regulator system constraints must be set for this regulator before 1546 * calling this function otherwise this call will fail. 1547 */ 1548int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1549{ 1550 struct regulator_dev *rdev = regulator->rdev; 1551 int ret; 1552 1553 mutex_lock(&rdev->mutex); 1554 1555 /* sanity check */ 1556 if (!rdev->desc->ops->set_mode) { 1557 ret = -EINVAL; 1558 goto out; 1559 } 1560 1561 /* constraints check */ 1562 ret = regulator_check_mode(rdev, mode); 1563 if (ret < 0) 1564 goto out; 1565 1566 ret = rdev->desc->ops->set_mode(rdev, mode); 1567out: 1568 mutex_unlock(&rdev->mutex); 1569 return ret; 1570} 1571EXPORT_SYMBOL_GPL(regulator_set_mode); 1572 1573static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1574{ 1575 int ret; 1576 1577 mutex_lock(&rdev->mutex); 1578 1579 /* sanity check */ 1580 if (!rdev->desc->ops->get_mode) { 1581 ret = -EINVAL; 1582 goto out; 1583 } 1584 1585 ret = rdev->desc->ops->get_mode(rdev); 1586out: 1587 mutex_unlock(&rdev->mutex); 1588 return ret; 1589} 1590 1591/** 1592 * regulator_get_mode - get regulator operating mode 1593 * @regulator: regulator source 1594 * 1595 * Get the current regulator operating mode. 1596 */ 1597unsigned int regulator_get_mode(struct regulator *regulator) 1598{ 1599 return _regulator_get_mode(regulator->rdev); 1600} 1601EXPORT_SYMBOL_GPL(regulator_get_mode); 1602 1603/** 1604 * regulator_set_optimum_mode - set regulator optimum operating mode 1605 * @regulator: regulator source 1606 * @uA_load: load current 1607 * 1608 * Notifies the regulator core of a new device load. This is then used by 1609 * DRMS (if enabled by constraints) to set the most efficient regulator 1610 * operating mode for the new regulator loading. 1611 * 1612 * Consumer devices notify their supply regulator of the maximum power 1613 * they will require (can be taken from device datasheet in the power 1614 * consumption tables) when they change operational status and hence power 1615 * state. Examples of operational state changes that can affect power 1616 * consumption are :- 1617 * 1618 * o Device is opened / closed. 1619 * o Device I/O is about to begin or has just finished. 1620 * o Device is idling in between work. 1621 * 1622 * This information is also exported via sysfs to userspace. 1623 * 1624 * DRMS will sum the total requested load on the regulator and change 1625 * to the most efficient operating mode if platform constraints allow. 1626 * 1627 * Returns the new regulator mode or error. 1628 */ 1629int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1630{ 1631 struct regulator_dev *rdev = regulator->rdev; 1632 struct regulator *consumer; 1633 int ret, output_uV, input_uV, total_uA_load = 0; 1634 unsigned int mode; 1635 1636 mutex_lock(&rdev->mutex); 1637 1638 regulator->uA_load = uA_load; 1639 ret = regulator_check_drms(rdev); 1640 if (ret < 0) 1641 goto out; 1642 ret = -EINVAL; 1643 1644 /* sanity check */ 1645 if (!rdev->desc->ops->get_optimum_mode) 1646 goto out; 1647 1648 /* get output voltage */ 1649 output_uV = rdev->desc->ops->get_voltage(rdev); 1650 if (output_uV <= 0) { 1651 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1652 __func__, rdev->desc->name); 1653 goto out; 1654 } 1655 1656 /* get input voltage */ 1657 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1658 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1659 else 1660 input_uV = rdev->constraints->input_uV; 1661 if (input_uV <= 0) { 1662 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1663 __func__, rdev->desc->name); 1664 goto out; 1665 } 1666 1667 /* calc total requested load for this regulator */ 1668 list_for_each_entry(consumer, &rdev->consumer_list, list) 1669 total_uA_load += consumer->uA_load; 1670 1671 mode = rdev->desc->ops->get_optimum_mode(rdev, 1672 input_uV, output_uV, 1673 total_uA_load); 1674 ret = regulator_check_mode(rdev, mode); 1675 if (ret < 0) { 1676 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1677 " %d uA %d -> %d uV\n", __func__, rdev->desc->name, 1678 total_uA_load, input_uV, output_uV); 1679 goto out; 1680 } 1681 1682 ret = rdev->desc->ops->set_mode(rdev, mode); 1683 if (ret < 0) { 1684 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1685 __func__, mode, rdev->desc->name); 1686 goto out; 1687 } 1688 ret = mode; 1689out: 1690 mutex_unlock(&rdev->mutex); 1691 return ret; 1692} 1693EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1694 1695/** 1696 * regulator_register_notifier - register regulator event notifier 1697 * @regulator: regulator source 1698 * @nb: notifier block 1699 * 1700 * Register notifier block to receive regulator events. 1701 */ 1702int regulator_register_notifier(struct regulator *regulator, 1703 struct notifier_block *nb) 1704{ 1705 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1706 nb); 1707} 1708EXPORT_SYMBOL_GPL(regulator_register_notifier); 1709 1710/** 1711 * regulator_unregister_notifier - unregister regulator event notifier 1712 * @regulator: regulator source 1713 * @nb: notifier block 1714 * 1715 * Unregister regulator event notifier block. 1716 */ 1717int regulator_unregister_notifier(struct regulator *regulator, 1718 struct notifier_block *nb) 1719{ 1720 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1721 nb); 1722} 1723EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1724 1725/* notify regulator consumers and downstream regulator consumers. 1726 * Note mutex must be held by caller. 1727 */ 1728static void _notifier_call_chain(struct regulator_dev *rdev, 1729 unsigned long event, void *data) 1730{ 1731 struct regulator_dev *_rdev; 1732 1733 /* call rdev chain first */ 1734 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1735 1736 /* now notify regulator we supply */ 1737 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1738 mutex_lock(&_rdev->mutex); 1739 _notifier_call_chain(_rdev, event, data); 1740 mutex_unlock(&_rdev->mutex); 1741 } 1742} 1743 1744/** 1745 * regulator_bulk_get - get multiple regulator consumers 1746 * 1747 * @dev: Device to supply 1748 * @num_consumers: Number of consumers to register 1749 * @consumers: Configuration of consumers; clients are stored here. 1750 * 1751 * @return 0 on success, an errno on failure. 1752 * 1753 * This helper function allows drivers to get several regulator 1754 * consumers in one operation. If any of the regulators cannot be 1755 * acquired then any regulators that were allocated will be freed 1756 * before returning to the caller. 1757 */ 1758int regulator_bulk_get(struct device *dev, int num_consumers, 1759 struct regulator_bulk_data *consumers) 1760{ 1761 int i; 1762 int ret; 1763 1764 for (i = 0; i < num_consumers; i++) 1765 consumers[i].consumer = NULL; 1766 1767 for (i = 0; i < num_consumers; i++) { 1768 consumers[i].consumer = regulator_get(dev, 1769 consumers[i].supply); 1770 if (IS_ERR(consumers[i].consumer)) { 1771 dev_err(dev, "Failed to get supply '%s'\n", 1772 consumers[i].supply); 1773 ret = PTR_ERR(consumers[i].consumer); 1774 consumers[i].consumer = NULL; 1775 goto err; 1776 } 1777 } 1778 1779 return 0; 1780 1781err: 1782 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1783 regulator_put(consumers[i].consumer); 1784 1785 return ret; 1786} 1787EXPORT_SYMBOL_GPL(regulator_bulk_get); 1788 1789/** 1790 * regulator_bulk_enable - enable multiple regulator consumers 1791 * 1792 * @num_consumers: Number of consumers 1793 * @consumers: Consumer data; clients are stored here. 1794 * @return 0 on success, an errno on failure 1795 * 1796 * This convenience API allows consumers to enable multiple regulator 1797 * clients in a single API call. If any consumers cannot be enabled 1798 * then any others that were enabled will be disabled again prior to 1799 * return. 1800 */ 1801int regulator_bulk_enable(int num_consumers, 1802 struct regulator_bulk_data *consumers) 1803{ 1804 int i; 1805 int ret; 1806 1807 for (i = 0; i < num_consumers; i++) { 1808 ret = regulator_enable(consumers[i].consumer); 1809 if (ret != 0) 1810 goto err; 1811 } 1812 1813 return 0; 1814 1815err: 1816 printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply); 1817 for (i = 0; i < num_consumers; i++) 1818 regulator_disable(consumers[i].consumer); 1819 1820 return ret; 1821} 1822EXPORT_SYMBOL_GPL(regulator_bulk_enable); 1823 1824/** 1825 * regulator_bulk_disable - disable multiple regulator consumers 1826 * 1827 * @num_consumers: Number of consumers 1828 * @consumers: Consumer data; clients are stored here. 1829 * @return 0 on success, an errno on failure 1830 * 1831 * This convenience API allows consumers to disable multiple regulator 1832 * clients in a single API call. If any consumers cannot be enabled 1833 * then any others that were disabled will be disabled again prior to 1834 * return. 1835 */ 1836int regulator_bulk_disable(int num_consumers, 1837 struct regulator_bulk_data *consumers) 1838{ 1839 int i; 1840 int ret; 1841 1842 for (i = 0; i < num_consumers; i++) { 1843 ret = regulator_disable(consumers[i].consumer); 1844 if (ret != 0) 1845 goto err; 1846 } 1847 1848 return 0; 1849 1850err: 1851 printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply); 1852 for (i = 0; i < num_consumers; i++) 1853 regulator_enable(consumers[i].consumer); 1854 1855 return ret; 1856} 1857EXPORT_SYMBOL_GPL(regulator_bulk_disable); 1858 1859/** 1860 * regulator_bulk_free - free multiple regulator consumers 1861 * 1862 * @num_consumers: Number of consumers 1863 * @consumers: Consumer data; clients are stored here. 1864 * 1865 * This convenience API allows consumers to free multiple regulator 1866 * clients in a single API call. 1867 */ 1868void regulator_bulk_free(int num_consumers, 1869 struct regulator_bulk_data *consumers) 1870{ 1871 int i; 1872 1873 for (i = 0; i < num_consumers; i++) { 1874 regulator_put(consumers[i].consumer); 1875 consumers[i].consumer = NULL; 1876 } 1877} 1878EXPORT_SYMBOL_GPL(regulator_bulk_free); 1879 1880/** 1881 * regulator_notifier_call_chain - call regulator event notifier 1882 * @rdev: regulator source 1883 * @event: notifier block 1884 * @data: callback-specific data. 1885 * 1886 * Called by regulator drivers to notify clients a regulator event has 1887 * occurred. We also notify regulator clients downstream. 1888 * Note lock must be held by caller. 1889 */ 1890int regulator_notifier_call_chain(struct regulator_dev *rdev, 1891 unsigned long event, void *data) 1892{ 1893 _notifier_call_chain(rdev, event, data); 1894 return NOTIFY_DONE; 1895 1896} 1897EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 1898 1899/** 1900 * regulator_mode_to_status - convert a regulator mode into a status 1901 * 1902 * @mode: Mode to convert 1903 * 1904 * Convert a regulator mode into a status. 1905 */ 1906int regulator_mode_to_status(unsigned int mode) 1907{ 1908 switch (mode) { 1909 case REGULATOR_MODE_FAST: 1910 return REGULATOR_STATUS_FAST; 1911 case REGULATOR_MODE_NORMAL: 1912 return REGULATOR_STATUS_NORMAL; 1913 case REGULATOR_MODE_IDLE: 1914 return REGULATOR_STATUS_IDLE; 1915 case REGULATOR_STATUS_STANDBY: 1916 return REGULATOR_STATUS_STANDBY; 1917 default: 1918 return 0; 1919 } 1920} 1921EXPORT_SYMBOL_GPL(regulator_mode_to_status); 1922 1923/* 1924 * To avoid cluttering sysfs (and memory) with useless state, only 1925 * create attributes that can be meaningfully displayed. 1926 */ 1927static int add_regulator_attributes(struct regulator_dev *rdev) 1928{ 1929 struct device *dev = &rdev->dev; 1930 struct regulator_ops *ops = rdev->desc->ops; 1931 int status = 0; 1932 1933 /* some attributes need specific methods to be displayed */ 1934 if (ops->get_voltage) { 1935 status = device_create_file(dev, &dev_attr_microvolts); 1936 if (status < 0) 1937 return status; 1938 } 1939 if (ops->get_current_limit) { 1940 status = device_create_file(dev, &dev_attr_microamps); 1941 if (status < 0) 1942 return status; 1943 } 1944 if (ops->get_mode) { 1945 status = device_create_file(dev, &dev_attr_opmode); 1946 if (status < 0) 1947 return status; 1948 } 1949 if (ops->is_enabled) { 1950 status = device_create_file(dev, &dev_attr_state); 1951 if (status < 0) 1952 return status; 1953 } 1954 if (ops->get_status) { 1955 status = device_create_file(dev, &dev_attr_status); 1956 if (status < 0) 1957 return status; 1958 } 1959 1960 /* some attributes are type-specific */ 1961 if (rdev->desc->type == REGULATOR_CURRENT) { 1962 status = device_create_file(dev, &dev_attr_requested_microamps); 1963 if (status < 0) 1964 return status; 1965 } 1966 1967 /* all the other attributes exist to support constraints; 1968 * don't show them if there are no constraints, or if the 1969 * relevant supporting methods are missing. 1970 */ 1971 if (!rdev->constraints) 1972 return status; 1973 1974 /* constraints need specific supporting methods */ 1975 if (ops->set_voltage) { 1976 status = device_create_file(dev, &dev_attr_min_microvolts); 1977 if (status < 0) 1978 return status; 1979 status = device_create_file(dev, &dev_attr_max_microvolts); 1980 if (status < 0) 1981 return status; 1982 } 1983 if (ops->set_current_limit) { 1984 status = device_create_file(dev, &dev_attr_min_microamps); 1985 if (status < 0) 1986 return status; 1987 status = device_create_file(dev, &dev_attr_max_microamps); 1988 if (status < 0) 1989 return status; 1990 } 1991 1992 /* suspend mode constraints need multiple supporting methods */ 1993 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 1994 return status; 1995 1996 status = device_create_file(dev, &dev_attr_suspend_standby_state); 1997 if (status < 0) 1998 return status; 1999 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2000 if (status < 0) 2001 return status; 2002 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2003 if (status < 0) 2004 return status; 2005 2006 if (ops->set_suspend_voltage) { 2007 status = device_create_file(dev, 2008 &dev_attr_suspend_standby_microvolts); 2009 if (status < 0) 2010 return status; 2011 status = device_create_file(dev, 2012 &dev_attr_suspend_mem_microvolts); 2013 if (status < 0) 2014 return status; 2015 status = device_create_file(dev, 2016 &dev_attr_suspend_disk_microvolts); 2017 if (status < 0) 2018 return status; 2019 } 2020 2021 if (ops->set_suspend_mode) { 2022 status = device_create_file(dev, 2023 &dev_attr_suspend_standby_mode); 2024 if (status < 0) 2025 return status; 2026 status = device_create_file(dev, 2027 &dev_attr_suspend_mem_mode); 2028 if (status < 0) 2029 return status; 2030 status = device_create_file(dev, 2031 &dev_attr_suspend_disk_mode); 2032 if (status < 0) 2033 return status; 2034 } 2035 2036 return status; 2037} 2038 2039/** 2040 * regulator_register - register regulator 2041 * @regulator_desc: regulator to register 2042 * @dev: struct device for the regulator 2043 * @init_data: platform provided init data, passed through by driver 2044 * @driver_data: private regulator data 2045 * 2046 * Called by regulator drivers to register a regulator. 2047 * Returns 0 on success. 2048 */ 2049struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2050 struct device *dev, struct regulator_init_data *init_data, 2051 void *driver_data) 2052{ 2053 static atomic_t regulator_no = ATOMIC_INIT(0); 2054 struct regulator_dev *rdev; 2055 int ret, i; 2056 2057 if (regulator_desc == NULL) 2058 return ERR_PTR(-EINVAL); 2059 2060 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2061 return ERR_PTR(-EINVAL); 2062 2063 if (regulator_desc->type != REGULATOR_VOLTAGE && 2064 regulator_desc->type != REGULATOR_CURRENT) 2065 return ERR_PTR(-EINVAL); 2066 2067 if (!init_data) 2068 return ERR_PTR(-EINVAL); 2069 2070 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2071 if (rdev == NULL) 2072 return ERR_PTR(-ENOMEM); 2073 2074 mutex_lock(®ulator_list_mutex); 2075 2076 mutex_init(&rdev->mutex); 2077 rdev->reg_data = driver_data; 2078 rdev->owner = regulator_desc->owner; 2079 rdev->desc = regulator_desc; 2080 INIT_LIST_HEAD(&rdev->consumer_list); 2081 INIT_LIST_HEAD(&rdev->supply_list); 2082 INIT_LIST_HEAD(&rdev->list); 2083 INIT_LIST_HEAD(&rdev->slist); 2084 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2085 2086 /* preform any regulator specific init */ 2087 if (init_data->regulator_init) { 2088 ret = init_data->regulator_init(rdev->reg_data); 2089 if (ret < 0) 2090 goto clean; 2091 } 2092 2093 /* register with sysfs */ 2094 rdev->dev.class = ®ulator_class; 2095 rdev->dev.parent = dev; 2096 dev_set_name(&rdev->dev, "regulator.%d", 2097 atomic_inc_return(®ulator_no) - 1); 2098 ret = device_register(&rdev->dev); 2099 if (ret != 0) 2100 goto clean; 2101 2102 dev_set_drvdata(&rdev->dev, rdev); 2103 2104 /* set regulator constraints */ 2105 ret = set_machine_constraints(rdev, &init_data->constraints); 2106 if (ret < 0) 2107 goto scrub; 2108 2109 /* add attributes supported by this regulator */ 2110 ret = add_regulator_attributes(rdev); 2111 if (ret < 0) 2112 goto scrub; 2113 2114 /* set supply regulator if it exists */ 2115 if (init_data->supply_regulator_dev) { 2116 ret = set_supply(rdev, 2117 dev_get_drvdata(init_data->supply_regulator_dev)); 2118 if (ret < 0) 2119 goto scrub; 2120 } 2121 2122 /* add consumers devices */ 2123 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2124 ret = set_consumer_device_supply(rdev, 2125 init_data->consumer_supplies[i].dev, 2126 init_data->consumer_supplies[i].dev_name, 2127 init_data->consumer_supplies[i].supply); 2128 if (ret < 0) { 2129 for (--i; i >= 0; i--) 2130 unset_consumer_device_supply(rdev, 2131 init_data->consumer_supplies[i].dev_name, 2132 init_data->consumer_supplies[i].dev); 2133 goto scrub; 2134 } 2135 } 2136 2137 list_add(&rdev->list, ®ulator_list); 2138out: 2139 mutex_unlock(®ulator_list_mutex); 2140 return rdev; 2141 2142scrub: 2143 device_unregister(&rdev->dev); 2144 /* device core frees rdev */ 2145 rdev = ERR_PTR(ret); 2146 goto out; 2147 2148clean: 2149 kfree(rdev); 2150 rdev = ERR_PTR(ret); 2151 goto out; 2152} 2153EXPORT_SYMBOL_GPL(regulator_register); 2154 2155/** 2156 * regulator_unregister - unregister regulator 2157 * @rdev: regulator to unregister 2158 * 2159 * Called by regulator drivers to unregister a regulator. 2160 */ 2161void regulator_unregister(struct regulator_dev *rdev) 2162{ 2163 if (rdev == NULL) 2164 return; 2165 2166 mutex_lock(®ulator_list_mutex); 2167 unset_regulator_supplies(rdev); 2168 list_del(&rdev->list); 2169 if (rdev->supply) 2170 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2171 device_unregister(&rdev->dev); 2172 mutex_unlock(®ulator_list_mutex); 2173} 2174EXPORT_SYMBOL_GPL(regulator_unregister); 2175 2176/** 2177 * regulator_suspend_prepare - prepare regulators for system wide suspend 2178 * @state: system suspend state 2179 * 2180 * Configure each regulator with it's suspend operating parameters for state. 2181 * This will usually be called by machine suspend code prior to supending. 2182 */ 2183int regulator_suspend_prepare(suspend_state_t state) 2184{ 2185 struct regulator_dev *rdev; 2186 int ret = 0; 2187 2188 /* ON is handled by regulator active state */ 2189 if (state == PM_SUSPEND_ON) 2190 return -EINVAL; 2191 2192 mutex_lock(®ulator_list_mutex); 2193 list_for_each_entry(rdev, ®ulator_list, list) { 2194 2195 mutex_lock(&rdev->mutex); 2196 ret = suspend_prepare(rdev, state); 2197 mutex_unlock(&rdev->mutex); 2198 2199 if (ret < 0) { 2200 printk(KERN_ERR "%s: failed to prepare %s\n", 2201 __func__, rdev->desc->name); 2202 goto out; 2203 } 2204 } 2205out: 2206 mutex_unlock(®ulator_list_mutex); 2207 return ret; 2208} 2209EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2210 2211/** 2212 * regulator_has_full_constraints - the system has fully specified constraints 2213 * 2214 * Calling this function will cause the regulator API to disable all 2215 * regulators which have a zero use count and don't have an always_on 2216 * constraint in a late_initcall. 2217 * 2218 * The intention is that this will become the default behaviour in a 2219 * future kernel release so users are encouraged to use this facility 2220 * now. 2221 */ 2222void regulator_has_full_constraints(void) 2223{ 2224 has_full_constraints = 1; 2225} 2226EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2227 2228/** 2229 * rdev_get_drvdata - get rdev regulator driver data 2230 * @rdev: regulator 2231 * 2232 * Get rdev regulator driver private data. This call can be used in the 2233 * regulator driver context. 2234 */ 2235void *rdev_get_drvdata(struct regulator_dev *rdev) 2236{ 2237 return rdev->reg_data; 2238} 2239EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2240 2241/** 2242 * regulator_get_drvdata - get regulator driver data 2243 * @regulator: regulator 2244 * 2245 * Get regulator driver private data. This call can be used in the consumer 2246 * driver context when non API regulator specific functions need to be called. 2247 */ 2248void *regulator_get_drvdata(struct regulator *regulator) 2249{ 2250 return regulator->rdev->reg_data; 2251} 2252EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2253 2254/** 2255 * regulator_set_drvdata - set regulator driver data 2256 * @regulator: regulator 2257 * @data: data 2258 */ 2259void regulator_set_drvdata(struct regulator *regulator, void *data) 2260{ 2261 regulator->rdev->reg_data = data; 2262} 2263EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2264 2265/** 2266 * regulator_get_id - get regulator ID 2267 * @rdev: regulator 2268 */ 2269int rdev_get_id(struct regulator_dev *rdev) 2270{ 2271 return rdev->desc->id; 2272} 2273EXPORT_SYMBOL_GPL(rdev_get_id); 2274 2275struct device *rdev_get_dev(struct regulator_dev *rdev) 2276{ 2277 return &rdev->dev; 2278} 2279EXPORT_SYMBOL_GPL(rdev_get_dev); 2280 2281void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2282{ 2283 return reg_init_data->driver_data; 2284} 2285EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2286 2287static int __init regulator_init(void) 2288{ 2289 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2290 return class_register(®ulator_class); 2291} 2292 2293/* init early to allow our consumers to complete system booting */ 2294core_initcall(regulator_init); 2295 2296static int __init regulator_init_complete(void) 2297{ 2298 struct regulator_dev *rdev; 2299 struct regulator_ops *ops; 2300 struct regulation_constraints *c; 2301 int enabled, ret; 2302 const char *name; 2303 2304 mutex_lock(®ulator_list_mutex); 2305 2306 /* If we have a full configuration then disable any regulators 2307 * which are not in use or always_on. This will become the 2308 * default behaviour in the future. 2309 */ 2310 list_for_each_entry(rdev, ®ulator_list, list) { 2311 ops = rdev->desc->ops; 2312 c = rdev->constraints; 2313 2314 if (c->name) 2315 name = c->name; 2316 else if (rdev->desc->name) 2317 name = rdev->desc->name; 2318 else 2319 name = "regulator"; 2320 2321 if (!ops->disable || c->always_on) 2322 continue; 2323 2324 mutex_lock(&rdev->mutex); 2325 2326 if (rdev->use_count) 2327 goto unlock; 2328 2329 /* If we can't read the status assume it's on. */ 2330 if (ops->is_enabled) 2331 enabled = ops->is_enabled(rdev); 2332 else 2333 enabled = 1; 2334 2335 if (!enabled) 2336 goto unlock; 2337 2338 if (has_full_constraints) { 2339 /* We log since this may kill the system if it 2340 * goes wrong. */ 2341 printk(KERN_INFO "%s: disabling %s\n", 2342 __func__, name); 2343 ret = ops->disable(rdev); 2344 if (ret != 0) { 2345 printk(KERN_ERR 2346 "%s: couldn't disable %s: %d\n", 2347 __func__, name, ret); 2348 } 2349 } else { 2350 /* The intention is that in future we will 2351 * assume that full constraints are provided 2352 * so warn even if we aren't going to do 2353 * anything here. 2354 */ 2355 printk(KERN_WARNING 2356 "%s: incomplete constraints, leaving %s on\n", 2357 __func__, name); 2358 } 2359 2360unlock: 2361 mutex_unlock(&rdev->mutex); 2362 } 2363 2364 mutex_unlock(®ulator_list_mutex); 2365 2366 return 0; 2367} 2368late_initcall(regulator_init_complete); 2369