core.c revision 63cee946148821bca42be10130b061c2d0f5af7e
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/slab.h> 20#include <linux/err.h> 21#include <linux/mutex.h> 22#include <linux/suspend.h> 23#include <linux/delay.h> 24#include <linux/regulator/consumer.h> 25#include <linux/regulator/driver.h> 26#include <linux/regulator/machine.h> 27 28#include "dummy.h" 29 30#define REGULATOR_VERSION "0.5" 31 32static DEFINE_MUTEX(regulator_list_mutex); 33static LIST_HEAD(regulator_list); 34static LIST_HEAD(regulator_map_list); 35static int has_full_constraints; 36static bool board_wants_dummy_regulator; 37 38/* 39 * struct regulator_map 40 * 41 * Used to provide symbolic supply names to devices. 42 */ 43struct regulator_map { 44 struct list_head list; 45 const char *dev_name; /* The dev_name() for the consumer */ 46 const char *supply; 47 struct regulator_dev *regulator; 48}; 49 50/* 51 * struct regulator 52 * 53 * One for each consumer device. 54 */ 55struct regulator { 56 struct device *dev; 57 struct list_head list; 58 int uA_load; 59 int min_uV; 60 int max_uV; 61 char *supply_name; 62 struct device_attribute dev_attr; 63 struct regulator_dev *rdev; 64}; 65 66static int _regulator_is_enabled(struct regulator_dev *rdev); 67static int _regulator_disable(struct regulator_dev *rdev, 68 struct regulator_dev **supply_rdev_ptr); 69static int _regulator_get_voltage(struct regulator_dev *rdev); 70static int _regulator_get_current_limit(struct regulator_dev *rdev); 71static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 72static void _notifier_call_chain(struct regulator_dev *rdev, 73 unsigned long event, void *data); 74 75static const char *rdev_get_name(struct regulator_dev *rdev) 76{ 77 if (rdev->constraints && rdev->constraints->name) 78 return rdev->constraints->name; 79 else if (rdev->desc->name) 80 return rdev->desc->name; 81 else 82 return ""; 83} 84 85/* gets the regulator for a given consumer device */ 86static struct regulator *get_device_regulator(struct device *dev) 87{ 88 struct regulator *regulator = NULL; 89 struct regulator_dev *rdev; 90 91 mutex_lock(®ulator_list_mutex); 92 list_for_each_entry(rdev, ®ulator_list, list) { 93 mutex_lock(&rdev->mutex); 94 list_for_each_entry(regulator, &rdev->consumer_list, list) { 95 if (regulator->dev == dev) { 96 mutex_unlock(&rdev->mutex); 97 mutex_unlock(®ulator_list_mutex); 98 return regulator; 99 } 100 } 101 mutex_unlock(&rdev->mutex); 102 } 103 mutex_unlock(®ulator_list_mutex); 104 return NULL; 105} 106 107/* Platform voltage constraint check */ 108static int regulator_check_voltage(struct regulator_dev *rdev, 109 int *min_uV, int *max_uV) 110{ 111 BUG_ON(*min_uV > *max_uV); 112 113 if (!rdev->constraints) { 114 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 115 rdev_get_name(rdev)); 116 return -ENODEV; 117 } 118 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 119 printk(KERN_ERR "%s: operation not allowed for %s\n", 120 __func__, rdev_get_name(rdev)); 121 return -EPERM; 122 } 123 124 if (*max_uV > rdev->constraints->max_uV) 125 *max_uV = rdev->constraints->max_uV; 126 if (*min_uV < rdev->constraints->min_uV) 127 *min_uV = rdev->constraints->min_uV; 128 129 if (*min_uV > *max_uV) 130 return -EINVAL; 131 132 return 0; 133} 134 135/* current constraint check */ 136static int regulator_check_current_limit(struct regulator_dev *rdev, 137 int *min_uA, int *max_uA) 138{ 139 BUG_ON(*min_uA > *max_uA); 140 141 if (!rdev->constraints) { 142 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 143 rdev_get_name(rdev)); 144 return -ENODEV; 145 } 146 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 147 printk(KERN_ERR "%s: operation not allowed for %s\n", 148 __func__, rdev_get_name(rdev)); 149 return -EPERM; 150 } 151 152 if (*max_uA > rdev->constraints->max_uA) 153 *max_uA = rdev->constraints->max_uA; 154 if (*min_uA < rdev->constraints->min_uA) 155 *min_uA = rdev->constraints->min_uA; 156 157 if (*min_uA > *max_uA) 158 return -EINVAL; 159 160 return 0; 161} 162 163/* operating mode constraint check */ 164static int regulator_check_mode(struct regulator_dev *rdev, int mode) 165{ 166 switch (mode) { 167 case REGULATOR_MODE_FAST: 168 case REGULATOR_MODE_NORMAL: 169 case REGULATOR_MODE_IDLE: 170 case REGULATOR_MODE_STANDBY: 171 break; 172 default: 173 return -EINVAL; 174 } 175 176 if (!rdev->constraints) { 177 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 178 rdev_get_name(rdev)); 179 return -ENODEV; 180 } 181 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 182 printk(KERN_ERR "%s: operation not allowed for %s\n", 183 __func__, rdev_get_name(rdev)); 184 return -EPERM; 185 } 186 if (!(rdev->constraints->valid_modes_mask & mode)) { 187 printk(KERN_ERR "%s: invalid mode %x for %s\n", 188 __func__, mode, rdev_get_name(rdev)); 189 return -EINVAL; 190 } 191 return 0; 192} 193 194/* dynamic regulator mode switching constraint check */ 195static int regulator_check_drms(struct regulator_dev *rdev) 196{ 197 if (!rdev->constraints) { 198 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 199 rdev_get_name(rdev)); 200 return -ENODEV; 201 } 202 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 203 printk(KERN_ERR "%s: operation not allowed for %s\n", 204 __func__, rdev_get_name(rdev)); 205 return -EPERM; 206 } 207 return 0; 208} 209 210static ssize_t device_requested_uA_show(struct device *dev, 211 struct device_attribute *attr, char *buf) 212{ 213 struct regulator *regulator; 214 215 regulator = get_device_regulator(dev); 216 if (regulator == NULL) 217 return 0; 218 219 return sprintf(buf, "%d\n", regulator->uA_load); 220} 221 222static ssize_t regulator_uV_show(struct device *dev, 223 struct device_attribute *attr, char *buf) 224{ 225 struct regulator_dev *rdev = dev_get_drvdata(dev); 226 ssize_t ret; 227 228 mutex_lock(&rdev->mutex); 229 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 230 mutex_unlock(&rdev->mutex); 231 232 return ret; 233} 234static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 235 236static ssize_t regulator_uA_show(struct device *dev, 237 struct device_attribute *attr, char *buf) 238{ 239 struct regulator_dev *rdev = dev_get_drvdata(dev); 240 241 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 242} 243static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 244 245static ssize_t regulator_name_show(struct device *dev, 246 struct device_attribute *attr, char *buf) 247{ 248 struct regulator_dev *rdev = dev_get_drvdata(dev); 249 250 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 251} 252 253static ssize_t regulator_print_opmode(char *buf, int mode) 254{ 255 switch (mode) { 256 case REGULATOR_MODE_FAST: 257 return sprintf(buf, "fast\n"); 258 case REGULATOR_MODE_NORMAL: 259 return sprintf(buf, "normal\n"); 260 case REGULATOR_MODE_IDLE: 261 return sprintf(buf, "idle\n"); 262 case REGULATOR_MODE_STANDBY: 263 return sprintf(buf, "standby\n"); 264 } 265 return sprintf(buf, "unknown\n"); 266} 267 268static ssize_t regulator_opmode_show(struct device *dev, 269 struct device_attribute *attr, char *buf) 270{ 271 struct regulator_dev *rdev = dev_get_drvdata(dev); 272 273 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 274} 275static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 276 277static ssize_t regulator_print_state(char *buf, int state) 278{ 279 if (state > 0) 280 return sprintf(buf, "enabled\n"); 281 else if (state == 0) 282 return sprintf(buf, "disabled\n"); 283 else 284 return sprintf(buf, "unknown\n"); 285} 286 287static ssize_t regulator_state_show(struct device *dev, 288 struct device_attribute *attr, char *buf) 289{ 290 struct regulator_dev *rdev = dev_get_drvdata(dev); 291 ssize_t ret; 292 293 mutex_lock(&rdev->mutex); 294 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 295 mutex_unlock(&rdev->mutex); 296 297 return ret; 298} 299static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 300 301static ssize_t regulator_status_show(struct device *dev, 302 struct device_attribute *attr, char *buf) 303{ 304 struct regulator_dev *rdev = dev_get_drvdata(dev); 305 int status; 306 char *label; 307 308 status = rdev->desc->ops->get_status(rdev); 309 if (status < 0) 310 return status; 311 312 switch (status) { 313 case REGULATOR_STATUS_OFF: 314 label = "off"; 315 break; 316 case REGULATOR_STATUS_ON: 317 label = "on"; 318 break; 319 case REGULATOR_STATUS_ERROR: 320 label = "error"; 321 break; 322 case REGULATOR_STATUS_FAST: 323 label = "fast"; 324 break; 325 case REGULATOR_STATUS_NORMAL: 326 label = "normal"; 327 break; 328 case REGULATOR_STATUS_IDLE: 329 label = "idle"; 330 break; 331 case REGULATOR_STATUS_STANDBY: 332 label = "standby"; 333 break; 334 default: 335 return -ERANGE; 336 } 337 338 return sprintf(buf, "%s\n", label); 339} 340static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 341 342static ssize_t regulator_min_uA_show(struct device *dev, 343 struct device_attribute *attr, char *buf) 344{ 345 struct regulator_dev *rdev = dev_get_drvdata(dev); 346 347 if (!rdev->constraints) 348 return sprintf(buf, "constraint not defined\n"); 349 350 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 351} 352static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 353 354static ssize_t regulator_max_uA_show(struct device *dev, 355 struct device_attribute *attr, char *buf) 356{ 357 struct regulator_dev *rdev = dev_get_drvdata(dev); 358 359 if (!rdev->constraints) 360 return sprintf(buf, "constraint not defined\n"); 361 362 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 363} 364static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 365 366static ssize_t regulator_min_uV_show(struct device *dev, 367 struct device_attribute *attr, char *buf) 368{ 369 struct regulator_dev *rdev = dev_get_drvdata(dev); 370 371 if (!rdev->constraints) 372 return sprintf(buf, "constraint not defined\n"); 373 374 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 375} 376static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 377 378static ssize_t regulator_max_uV_show(struct device *dev, 379 struct device_attribute *attr, char *buf) 380{ 381 struct regulator_dev *rdev = dev_get_drvdata(dev); 382 383 if (!rdev->constraints) 384 return sprintf(buf, "constraint not defined\n"); 385 386 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 387} 388static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 389 390static ssize_t regulator_total_uA_show(struct device *dev, 391 struct device_attribute *attr, char *buf) 392{ 393 struct regulator_dev *rdev = dev_get_drvdata(dev); 394 struct regulator *regulator; 395 int uA = 0; 396 397 mutex_lock(&rdev->mutex); 398 list_for_each_entry(regulator, &rdev->consumer_list, list) 399 uA += regulator->uA_load; 400 mutex_unlock(&rdev->mutex); 401 return sprintf(buf, "%d\n", uA); 402} 403static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 404 405static ssize_t regulator_num_users_show(struct device *dev, 406 struct device_attribute *attr, char *buf) 407{ 408 struct regulator_dev *rdev = dev_get_drvdata(dev); 409 return sprintf(buf, "%d\n", rdev->use_count); 410} 411 412static ssize_t regulator_type_show(struct device *dev, 413 struct device_attribute *attr, char *buf) 414{ 415 struct regulator_dev *rdev = dev_get_drvdata(dev); 416 417 switch (rdev->desc->type) { 418 case REGULATOR_VOLTAGE: 419 return sprintf(buf, "voltage\n"); 420 case REGULATOR_CURRENT: 421 return sprintf(buf, "current\n"); 422 } 423 return sprintf(buf, "unknown\n"); 424} 425 426static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 427 struct device_attribute *attr, char *buf) 428{ 429 struct regulator_dev *rdev = dev_get_drvdata(dev); 430 431 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 432} 433static DEVICE_ATTR(suspend_mem_microvolts, 0444, 434 regulator_suspend_mem_uV_show, NULL); 435 436static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 437 struct device_attribute *attr, char *buf) 438{ 439 struct regulator_dev *rdev = dev_get_drvdata(dev); 440 441 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 442} 443static DEVICE_ATTR(suspend_disk_microvolts, 0444, 444 regulator_suspend_disk_uV_show, NULL); 445 446static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 447 struct device_attribute *attr, char *buf) 448{ 449 struct regulator_dev *rdev = dev_get_drvdata(dev); 450 451 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 452} 453static DEVICE_ATTR(suspend_standby_microvolts, 0444, 454 regulator_suspend_standby_uV_show, NULL); 455 456static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 457 struct device_attribute *attr, char *buf) 458{ 459 struct regulator_dev *rdev = dev_get_drvdata(dev); 460 461 return regulator_print_opmode(buf, 462 rdev->constraints->state_mem.mode); 463} 464static DEVICE_ATTR(suspend_mem_mode, 0444, 465 regulator_suspend_mem_mode_show, NULL); 466 467static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 472 return regulator_print_opmode(buf, 473 rdev->constraints->state_disk.mode); 474} 475static DEVICE_ATTR(suspend_disk_mode, 0444, 476 regulator_suspend_disk_mode_show, NULL); 477 478static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 483 return regulator_print_opmode(buf, 484 rdev->constraints->state_standby.mode); 485} 486static DEVICE_ATTR(suspend_standby_mode, 0444, 487 regulator_suspend_standby_mode_show, NULL); 488 489static ssize_t regulator_suspend_mem_state_show(struct device *dev, 490 struct device_attribute *attr, char *buf) 491{ 492 struct regulator_dev *rdev = dev_get_drvdata(dev); 493 494 return regulator_print_state(buf, 495 rdev->constraints->state_mem.enabled); 496} 497static DEVICE_ATTR(suspend_mem_state, 0444, 498 regulator_suspend_mem_state_show, NULL); 499 500static ssize_t regulator_suspend_disk_state_show(struct device *dev, 501 struct device_attribute *attr, char *buf) 502{ 503 struct regulator_dev *rdev = dev_get_drvdata(dev); 504 505 return regulator_print_state(buf, 506 rdev->constraints->state_disk.enabled); 507} 508static DEVICE_ATTR(suspend_disk_state, 0444, 509 regulator_suspend_disk_state_show, NULL); 510 511static ssize_t regulator_suspend_standby_state_show(struct device *dev, 512 struct device_attribute *attr, char *buf) 513{ 514 struct regulator_dev *rdev = dev_get_drvdata(dev); 515 516 return regulator_print_state(buf, 517 rdev->constraints->state_standby.enabled); 518} 519static DEVICE_ATTR(suspend_standby_state, 0444, 520 regulator_suspend_standby_state_show, NULL); 521 522 523/* 524 * These are the only attributes are present for all regulators. 525 * Other attributes are a function of regulator functionality. 526 */ 527static struct device_attribute regulator_dev_attrs[] = { 528 __ATTR(name, 0444, regulator_name_show, NULL), 529 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 530 __ATTR(type, 0444, regulator_type_show, NULL), 531 __ATTR_NULL, 532}; 533 534static void regulator_dev_release(struct device *dev) 535{ 536 struct regulator_dev *rdev = dev_get_drvdata(dev); 537 kfree(rdev); 538} 539 540static struct class regulator_class = { 541 .name = "regulator", 542 .dev_release = regulator_dev_release, 543 .dev_attrs = regulator_dev_attrs, 544}; 545 546/* Calculate the new optimum regulator operating mode based on the new total 547 * consumer load. All locks held by caller */ 548static void drms_uA_update(struct regulator_dev *rdev) 549{ 550 struct regulator *sibling; 551 int current_uA = 0, output_uV, input_uV, err; 552 unsigned int mode; 553 554 err = regulator_check_drms(rdev); 555 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 556 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 557 return; 558 559 /* get output voltage */ 560 output_uV = rdev->desc->ops->get_voltage(rdev); 561 if (output_uV <= 0) 562 return; 563 564 /* get input voltage */ 565 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 566 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 567 else 568 input_uV = rdev->constraints->input_uV; 569 if (input_uV <= 0) 570 return; 571 572 /* calc total requested load */ 573 list_for_each_entry(sibling, &rdev->consumer_list, list) 574 current_uA += sibling->uA_load; 575 576 /* now get the optimum mode for our new total regulator load */ 577 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 578 output_uV, current_uA); 579 580 /* check the new mode is allowed */ 581 err = regulator_check_mode(rdev, mode); 582 if (err == 0) 583 rdev->desc->ops->set_mode(rdev, mode); 584} 585 586static int suspend_set_state(struct regulator_dev *rdev, 587 struct regulator_state *rstate) 588{ 589 int ret = 0; 590 bool can_set_state; 591 592 can_set_state = rdev->desc->ops->set_suspend_enable && 593 rdev->desc->ops->set_suspend_disable; 594 595 /* If we have no suspend mode configration don't set anything; 596 * only warn if the driver actually makes the suspend mode 597 * configurable. 598 */ 599 if (!rstate->enabled && !rstate->disabled) { 600 if (can_set_state) 601 printk(KERN_WARNING "%s: No configuration for %s\n", 602 __func__, rdev_get_name(rdev)); 603 return 0; 604 } 605 606 if (rstate->enabled && rstate->disabled) { 607 printk(KERN_ERR "%s: invalid configuration for %s\n", 608 __func__, rdev_get_name(rdev)); 609 return -EINVAL; 610 } 611 612 if (!can_set_state) { 613 printk(KERN_ERR "%s: no way to set suspend state\n", 614 __func__); 615 return -EINVAL; 616 } 617 618 if (rstate->enabled) 619 ret = rdev->desc->ops->set_suspend_enable(rdev); 620 else 621 ret = rdev->desc->ops->set_suspend_disable(rdev); 622 if (ret < 0) { 623 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 624 return ret; 625 } 626 627 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 628 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 629 if (ret < 0) { 630 printk(KERN_ERR "%s: failed to set voltage\n", 631 __func__); 632 return ret; 633 } 634 } 635 636 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 637 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 638 if (ret < 0) { 639 printk(KERN_ERR "%s: failed to set mode\n", __func__); 640 return ret; 641 } 642 } 643 return ret; 644} 645 646/* locks held by caller */ 647static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 648{ 649 if (!rdev->constraints) 650 return -EINVAL; 651 652 switch (state) { 653 case PM_SUSPEND_STANDBY: 654 return suspend_set_state(rdev, 655 &rdev->constraints->state_standby); 656 case PM_SUSPEND_MEM: 657 return suspend_set_state(rdev, 658 &rdev->constraints->state_mem); 659 case PM_SUSPEND_MAX: 660 return suspend_set_state(rdev, 661 &rdev->constraints->state_disk); 662 default: 663 return -EINVAL; 664 } 665} 666 667static void print_constraints(struct regulator_dev *rdev) 668{ 669 struct regulation_constraints *constraints = rdev->constraints; 670 char buf[80] = ""; 671 int count = 0; 672 int ret; 673 674 if (constraints->min_uV && constraints->max_uV) { 675 if (constraints->min_uV == constraints->max_uV) 676 count += sprintf(buf + count, "%d mV ", 677 constraints->min_uV / 1000); 678 else 679 count += sprintf(buf + count, "%d <--> %d mV ", 680 constraints->min_uV / 1000, 681 constraints->max_uV / 1000); 682 } 683 684 if (!constraints->min_uV || 685 constraints->min_uV != constraints->max_uV) { 686 ret = _regulator_get_voltage(rdev); 687 if (ret > 0) 688 count += sprintf(buf + count, "at %d mV ", ret / 1000); 689 } 690 691 if (constraints->min_uA && constraints->max_uA) { 692 if (constraints->min_uA == constraints->max_uA) 693 count += sprintf(buf + count, "%d mA ", 694 constraints->min_uA / 1000); 695 else 696 count += sprintf(buf + count, "%d <--> %d mA ", 697 constraints->min_uA / 1000, 698 constraints->max_uA / 1000); 699 } 700 701 if (!constraints->min_uA || 702 constraints->min_uA != constraints->max_uA) { 703 ret = _regulator_get_current_limit(rdev); 704 if (ret > 0) 705 count += sprintf(buf + count, "at %d mA ", ret / 1000); 706 } 707 708 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 709 count += sprintf(buf + count, "fast "); 710 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 711 count += sprintf(buf + count, "normal "); 712 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 713 count += sprintf(buf + count, "idle "); 714 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 715 count += sprintf(buf + count, "standby"); 716 717 printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 718} 719 720static int machine_constraints_voltage(struct regulator_dev *rdev, 721 struct regulation_constraints *constraints) 722{ 723 struct regulator_ops *ops = rdev->desc->ops; 724 const char *name = rdev_get_name(rdev); 725 int ret; 726 727 /* do we need to apply the constraint voltage */ 728 if (rdev->constraints->apply_uV && 729 rdev->constraints->min_uV == rdev->constraints->max_uV && 730 ops->set_voltage) { 731 ret = ops->set_voltage(rdev, 732 rdev->constraints->min_uV, rdev->constraints->max_uV); 733 if (ret < 0) { 734 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 735 __func__, 736 rdev->constraints->min_uV, name); 737 rdev->constraints = NULL; 738 return ret; 739 } 740 } 741 742 /* constrain machine-level voltage specs to fit 743 * the actual range supported by this regulator. 744 */ 745 if (ops->list_voltage && rdev->desc->n_voltages) { 746 int count = rdev->desc->n_voltages; 747 int i; 748 int min_uV = INT_MAX; 749 int max_uV = INT_MIN; 750 int cmin = constraints->min_uV; 751 int cmax = constraints->max_uV; 752 753 /* it's safe to autoconfigure fixed-voltage supplies 754 and the constraints are used by list_voltage. */ 755 if (count == 1 && !cmin) { 756 cmin = 1; 757 cmax = INT_MAX; 758 constraints->min_uV = cmin; 759 constraints->max_uV = cmax; 760 } 761 762 /* voltage constraints are optional */ 763 if ((cmin == 0) && (cmax == 0)) 764 return 0; 765 766 /* else require explicit machine-level constraints */ 767 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 768 pr_err("%s: %s '%s' voltage constraints\n", 769 __func__, "invalid", name); 770 return -EINVAL; 771 } 772 773 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 774 for (i = 0; i < count; i++) { 775 int value; 776 777 value = ops->list_voltage(rdev, i); 778 if (value <= 0) 779 continue; 780 781 /* maybe adjust [min_uV..max_uV] */ 782 if (value >= cmin && value < min_uV) 783 min_uV = value; 784 if (value <= cmax && value > max_uV) 785 max_uV = value; 786 } 787 788 /* final: [min_uV..max_uV] valid iff constraints valid */ 789 if (max_uV < min_uV) { 790 pr_err("%s: %s '%s' voltage constraints\n", 791 __func__, "unsupportable", name); 792 return -EINVAL; 793 } 794 795 /* use regulator's subset of machine constraints */ 796 if (constraints->min_uV < min_uV) { 797 pr_debug("%s: override '%s' %s, %d -> %d\n", 798 __func__, name, "min_uV", 799 constraints->min_uV, min_uV); 800 constraints->min_uV = min_uV; 801 } 802 if (constraints->max_uV > max_uV) { 803 pr_debug("%s: override '%s' %s, %d -> %d\n", 804 __func__, name, "max_uV", 805 constraints->max_uV, max_uV); 806 constraints->max_uV = max_uV; 807 } 808 } 809 810 return 0; 811} 812 813/** 814 * set_machine_constraints - sets regulator constraints 815 * @rdev: regulator source 816 * @constraints: constraints to apply 817 * 818 * Allows platform initialisation code to define and constrain 819 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 820 * Constraints *must* be set by platform code in order for some 821 * regulator operations to proceed i.e. set_voltage, set_current_limit, 822 * set_mode. 823 */ 824static int set_machine_constraints(struct regulator_dev *rdev, 825 struct regulation_constraints *constraints) 826{ 827 int ret = 0; 828 const char *name; 829 struct regulator_ops *ops = rdev->desc->ops; 830 831 rdev->constraints = constraints; 832 833 name = rdev_get_name(rdev); 834 835 ret = machine_constraints_voltage(rdev, constraints); 836 if (ret != 0) 837 goto out; 838 839 /* do we need to setup our suspend state */ 840 if (constraints->initial_state) { 841 ret = suspend_prepare(rdev, constraints->initial_state); 842 if (ret < 0) { 843 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 844 __func__, name); 845 rdev->constraints = NULL; 846 goto out; 847 } 848 } 849 850 if (constraints->initial_mode) { 851 if (!ops->set_mode) { 852 printk(KERN_ERR "%s: no set_mode operation for %s\n", 853 __func__, name); 854 ret = -EINVAL; 855 goto out; 856 } 857 858 ret = ops->set_mode(rdev, constraints->initial_mode); 859 if (ret < 0) { 860 printk(KERN_ERR 861 "%s: failed to set initial mode for %s: %d\n", 862 __func__, name, ret); 863 goto out; 864 } 865 } 866 867 /* If the constraints say the regulator should be on at this point 868 * and we have control then make sure it is enabled. 869 */ 870 if ((constraints->always_on || constraints->boot_on) && ops->enable) { 871 ret = ops->enable(rdev); 872 if (ret < 0) { 873 printk(KERN_ERR "%s: failed to enable %s\n", 874 __func__, name); 875 rdev->constraints = NULL; 876 goto out; 877 } 878 } 879 880 print_constraints(rdev); 881out: 882 return ret; 883} 884 885/** 886 * set_supply - set regulator supply regulator 887 * @rdev: regulator name 888 * @supply_rdev: supply regulator name 889 * 890 * Called by platform initialisation code to set the supply regulator for this 891 * regulator. This ensures that a regulators supply will also be enabled by the 892 * core if it's child is enabled. 893 */ 894static int set_supply(struct regulator_dev *rdev, 895 struct regulator_dev *supply_rdev) 896{ 897 int err; 898 899 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 900 "supply"); 901 if (err) { 902 printk(KERN_ERR 903 "%s: could not add device link %s err %d\n", 904 __func__, supply_rdev->dev.kobj.name, err); 905 goto out; 906 } 907 rdev->supply = supply_rdev; 908 list_add(&rdev->slist, &supply_rdev->supply_list); 909out: 910 return err; 911} 912 913/** 914 * set_consumer_device_supply - Bind a regulator to a symbolic supply 915 * @rdev: regulator source 916 * @consumer_dev: device the supply applies to 917 * @consumer_dev_name: dev_name() string for device supply applies to 918 * @supply: symbolic name for supply 919 * 920 * Allows platform initialisation code to map physical regulator 921 * sources to symbolic names for supplies for use by devices. Devices 922 * should use these symbolic names to request regulators, avoiding the 923 * need to provide board-specific regulator names as platform data. 924 * 925 * Only one of consumer_dev and consumer_dev_name may be specified. 926 */ 927static int set_consumer_device_supply(struct regulator_dev *rdev, 928 struct device *consumer_dev, const char *consumer_dev_name, 929 const char *supply) 930{ 931 struct regulator_map *node; 932 int has_dev; 933 934 if (consumer_dev && consumer_dev_name) 935 return -EINVAL; 936 937 if (!consumer_dev_name && consumer_dev) 938 consumer_dev_name = dev_name(consumer_dev); 939 940 if (supply == NULL) 941 return -EINVAL; 942 943 if (consumer_dev_name != NULL) 944 has_dev = 1; 945 else 946 has_dev = 0; 947 948 list_for_each_entry(node, ®ulator_map_list, list) { 949 if (node->dev_name && consumer_dev_name) { 950 if (strcmp(node->dev_name, consumer_dev_name) != 0) 951 continue; 952 } else if (node->dev_name || consumer_dev_name) { 953 continue; 954 } 955 956 if (strcmp(node->supply, supply) != 0) 957 continue; 958 959 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 960 dev_name(&node->regulator->dev), 961 node->regulator->desc->name, 962 supply, 963 dev_name(&rdev->dev), rdev_get_name(rdev)); 964 return -EBUSY; 965 } 966 967 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 968 if (node == NULL) 969 return -ENOMEM; 970 971 node->regulator = rdev; 972 node->supply = supply; 973 974 if (has_dev) { 975 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 976 if (node->dev_name == NULL) { 977 kfree(node); 978 return -ENOMEM; 979 } 980 } 981 982 list_add(&node->list, ®ulator_map_list); 983 return 0; 984} 985 986static void unset_regulator_supplies(struct regulator_dev *rdev) 987{ 988 struct regulator_map *node, *n; 989 990 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 991 if (rdev == node->regulator) { 992 list_del(&node->list); 993 kfree(node->dev_name); 994 kfree(node); 995 } 996 } 997} 998 999#define REG_STR_SIZE 32 1000 1001static struct regulator *create_regulator(struct regulator_dev *rdev, 1002 struct device *dev, 1003 const char *supply_name) 1004{ 1005 struct regulator *regulator; 1006 char buf[REG_STR_SIZE]; 1007 int err, size; 1008 1009 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1010 if (regulator == NULL) 1011 return NULL; 1012 1013 mutex_lock(&rdev->mutex); 1014 regulator->rdev = rdev; 1015 list_add(®ulator->list, &rdev->consumer_list); 1016 1017 if (dev) { 1018 /* create a 'requested_microamps_name' sysfs entry */ 1019 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1020 supply_name); 1021 if (size >= REG_STR_SIZE) 1022 goto overflow_err; 1023 1024 regulator->dev = dev; 1025 sysfs_attr_init(®ulator->dev_attr.attr); 1026 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1027 if (regulator->dev_attr.attr.name == NULL) 1028 goto attr_name_err; 1029 1030 regulator->dev_attr.attr.mode = 0444; 1031 regulator->dev_attr.show = device_requested_uA_show; 1032 err = device_create_file(dev, ®ulator->dev_attr); 1033 if (err < 0) { 1034 printk(KERN_WARNING "%s: could not add regulator_dev" 1035 " load sysfs\n", __func__); 1036 goto attr_name_err; 1037 } 1038 1039 /* also add a link to the device sysfs entry */ 1040 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1041 dev->kobj.name, supply_name); 1042 if (size >= REG_STR_SIZE) 1043 goto attr_err; 1044 1045 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1046 if (regulator->supply_name == NULL) 1047 goto attr_err; 1048 1049 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1050 buf); 1051 if (err) { 1052 printk(KERN_WARNING 1053 "%s: could not add device link %s err %d\n", 1054 __func__, dev->kobj.name, err); 1055 goto link_name_err; 1056 } 1057 } 1058 mutex_unlock(&rdev->mutex); 1059 return regulator; 1060link_name_err: 1061 kfree(regulator->supply_name); 1062attr_err: 1063 device_remove_file(regulator->dev, ®ulator->dev_attr); 1064attr_name_err: 1065 kfree(regulator->dev_attr.attr.name); 1066overflow_err: 1067 list_del(®ulator->list); 1068 kfree(regulator); 1069 mutex_unlock(&rdev->mutex); 1070 return NULL; 1071} 1072 1073static int _regulator_get_enable_time(struct regulator_dev *rdev) 1074{ 1075 if (!rdev->desc->ops->enable_time) 1076 return 0; 1077 return rdev->desc->ops->enable_time(rdev); 1078} 1079 1080/* Internal regulator request function */ 1081static struct regulator *_regulator_get(struct device *dev, const char *id, 1082 int exclusive) 1083{ 1084 struct regulator_dev *rdev; 1085 struct regulator_map *map; 1086 struct regulator *regulator = ERR_PTR(-ENODEV); 1087 const char *devname = NULL; 1088 int ret; 1089 1090 if (id == NULL) { 1091 printk(KERN_ERR "regulator: get() with no identifier\n"); 1092 return regulator; 1093 } 1094 1095 if (dev) 1096 devname = dev_name(dev); 1097 1098 mutex_lock(®ulator_list_mutex); 1099 1100 list_for_each_entry(map, ®ulator_map_list, list) { 1101 /* If the mapping has a device set up it must match */ 1102 if (map->dev_name && 1103 (!devname || strcmp(map->dev_name, devname))) 1104 continue; 1105 1106 if (strcmp(map->supply, id) == 0) { 1107 rdev = map->regulator; 1108 goto found; 1109 } 1110 } 1111 1112 if (board_wants_dummy_regulator) { 1113 rdev = dummy_regulator_rdev; 1114 goto found; 1115 } 1116 1117#ifdef CONFIG_REGULATOR_DUMMY 1118 if (!devname) 1119 devname = "deviceless"; 1120 1121 /* If the board didn't flag that it was fully constrained then 1122 * substitute in a dummy regulator so consumers can continue. 1123 */ 1124 if (!has_full_constraints) { 1125 pr_warning("%s supply %s not found, using dummy regulator\n", 1126 devname, id); 1127 rdev = dummy_regulator_rdev; 1128 goto found; 1129 } 1130#endif 1131 1132 mutex_unlock(®ulator_list_mutex); 1133 return regulator; 1134 1135found: 1136 if (rdev->exclusive) { 1137 regulator = ERR_PTR(-EPERM); 1138 goto out; 1139 } 1140 1141 if (exclusive && rdev->open_count) { 1142 regulator = ERR_PTR(-EBUSY); 1143 goto out; 1144 } 1145 1146 if (!try_module_get(rdev->owner)) 1147 goto out; 1148 1149 regulator = create_regulator(rdev, dev, id); 1150 if (regulator == NULL) { 1151 regulator = ERR_PTR(-ENOMEM); 1152 module_put(rdev->owner); 1153 } 1154 1155 rdev->open_count++; 1156 if (exclusive) { 1157 rdev->exclusive = 1; 1158 1159 ret = _regulator_is_enabled(rdev); 1160 if (ret > 0) 1161 rdev->use_count = 1; 1162 else 1163 rdev->use_count = 0; 1164 } 1165 1166out: 1167 mutex_unlock(®ulator_list_mutex); 1168 1169 return regulator; 1170} 1171 1172/** 1173 * regulator_get - lookup and obtain a reference to a regulator. 1174 * @dev: device for regulator "consumer" 1175 * @id: Supply name or regulator ID. 1176 * 1177 * Returns a struct regulator corresponding to the regulator producer, 1178 * or IS_ERR() condition containing errno. 1179 * 1180 * Use of supply names configured via regulator_set_device_supply() is 1181 * strongly encouraged. It is recommended that the supply name used 1182 * should match the name used for the supply and/or the relevant 1183 * device pins in the datasheet. 1184 */ 1185struct regulator *regulator_get(struct device *dev, const char *id) 1186{ 1187 return _regulator_get(dev, id, 0); 1188} 1189EXPORT_SYMBOL_GPL(regulator_get); 1190 1191/** 1192 * regulator_get_exclusive - obtain exclusive access to a regulator. 1193 * @dev: device for regulator "consumer" 1194 * @id: Supply name or regulator ID. 1195 * 1196 * Returns a struct regulator corresponding to the regulator producer, 1197 * or IS_ERR() condition containing errno. Other consumers will be 1198 * unable to obtain this reference is held and the use count for the 1199 * regulator will be initialised to reflect the current state of the 1200 * regulator. 1201 * 1202 * This is intended for use by consumers which cannot tolerate shared 1203 * use of the regulator such as those which need to force the 1204 * regulator off for correct operation of the hardware they are 1205 * controlling. 1206 * 1207 * Use of supply names configured via regulator_set_device_supply() is 1208 * strongly encouraged. It is recommended that the supply name used 1209 * should match the name used for the supply and/or the relevant 1210 * device pins in the datasheet. 1211 */ 1212struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1213{ 1214 return _regulator_get(dev, id, 1); 1215} 1216EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1217 1218/** 1219 * regulator_put - "free" the regulator source 1220 * @regulator: regulator source 1221 * 1222 * Note: drivers must ensure that all regulator_enable calls made on this 1223 * regulator source are balanced by regulator_disable calls prior to calling 1224 * this function. 1225 */ 1226void regulator_put(struct regulator *regulator) 1227{ 1228 struct regulator_dev *rdev; 1229 1230 if (regulator == NULL || IS_ERR(regulator)) 1231 return; 1232 1233 mutex_lock(®ulator_list_mutex); 1234 rdev = regulator->rdev; 1235 1236 /* remove any sysfs entries */ 1237 if (regulator->dev) { 1238 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1239 kfree(regulator->supply_name); 1240 device_remove_file(regulator->dev, ®ulator->dev_attr); 1241 kfree(regulator->dev_attr.attr.name); 1242 } 1243 list_del(®ulator->list); 1244 kfree(regulator); 1245 1246 rdev->open_count--; 1247 rdev->exclusive = 0; 1248 1249 module_put(rdev->owner); 1250 mutex_unlock(®ulator_list_mutex); 1251} 1252EXPORT_SYMBOL_GPL(regulator_put); 1253 1254static int _regulator_can_change_status(struct regulator_dev *rdev) 1255{ 1256 if (!rdev->constraints) 1257 return 0; 1258 1259 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1260 return 1; 1261 else 1262 return 0; 1263} 1264 1265/* locks held by regulator_enable() */ 1266static int _regulator_enable(struct regulator_dev *rdev) 1267{ 1268 int ret, delay; 1269 1270 /* do we need to enable the supply regulator first */ 1271 if (rdev->supply) { 1272 mutex_lock(&rdev->supply->mutex); 1273 ret = _regulator_enable(rdev->supply); 1274 mutex_unlock(&rdev->supply->mutex); 1275 if (ret < 0) { 1276 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1277 __func__, rdev_get_name(rdev), ret); 1278 return ret; 1279 } 1280 } 1281 1282 /* check voltage and requested load before enabling */ 1283 if (rdev->constraints && 1284 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1285 drms_uA_update(rdev); 1286 1287 if (rdev->use_count == 0) { 1288 /* The regulator may on if it's not switchable or left on */ 1289 ret = _regulator_is_enabled(rdev); 1290 if (ret == -EINVAL || ret == 0) { 1291 if (!_regulator_can_change_status(rdev)) 1292 return -EPERM; 1293 1294 if (!rdev->desc->ops->enable) 1295 return -EINVAL; 1296 1297 /* Query before enabling in case configuration 1298 * dependant. */ 1299 ret = _regulator_get_enable_time(rdev); 1300 if (ret >= 0) { 1301 delay = ret; 1302 } else { 1303 printk(KERN_WARNING 1304 "%s: enable_time() failed for %s: %d\n", 1305 __func__, rdev_get_name(rdev), 1306 ret); 1307 delay = 0; 1308 } 1309 1310 /* Allow the regulator to ramp; it would be useful 1311 * to extend this for bulk operations so that the 1312 * regulators can ramp together. */ 1313 ret = rdev->desc->ops->enable(rdev); 1314 if (ret < 0) 1315 return ret; 1316 1317 if (delay >= 1000) { 1318 mdelay(delay / 1000); 1319 udelay(delay % 1000); 1320 } else if (delay) { 1321 udelay(delay); 1322 } 1323 1324 } else if (ret < 0) { 1325 printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 1326 __func__, rdev_get_name(rdev), ret); 1327 return ret; 1328 } 1329 /* Fallthrough on positive return values - already enabled */ 1330 } 1331 1332 rdev->use_count++; 1333 1334 return 0; 1335} 1336 1337/** 1338 * regulator_enable - enable regulator output 1339 * @regulator: regulator source 1340 * 1341 * Request that the regulator be enabled with the regulator output at 1342 * the predefined voltage or current value. Calls to regulator_enable() 1343 * must be balanced with calls to regulator_disable(). 1344 * 1345 * NOTE: the output value can be set by other drivers, boot loader or may be 1346 * hardwired in the regulator. 1347 */ 1348int regulator_enable(struct regulator *regulator) 1349{ 1350 struct regulator_dev *rdev = regulator->rdev; 1351 int ret = 0; 1352 1353 mutex_lock(&rdev->mutex); 1354 ret = _regulator_enable(rdev); 1355 mutex_unlock(&rdev->mutex); 1356 return ret; 1357} 1358EXPORT_SYMBOL_GPL(regulator_enable); 1359 1360/* locks held by regulator_disable() */ 1361static int _regulator_disable(struct regulator_dev *rdev, 1362 struct regulator_dev **supply_rdev_ptr) 1363{ 1364 int ret = 0; 1365 *supply_rdev_ptr = NULL; 1366 1367 if (WARN(rdev->use_count <= 0, 1368 "unbalanced disables for %s\n", 1369 rdev_get_name(rdev))) 1370 return -EIO; 1371 1372 /* are we the last user and permitted to disable ? */ 1373 if (rdev->use_count == 1 && 1374 (rdev->constraints && !rdev->constraints->always_on)) { 1375 1376 /* we are last user */ 1377 if (_regulator_can_change_status(rdev) && 1378 rdev->desc->ops->disable) { 1379 ret = rdev->desc->ops->disable(rdev); 1380 if (ret < 0) { 1381 printk(KERN_ERR "%s: failed to disable %s\n", 1382 __func__, rdev_get_name(rdev)); 1383 return ret; 1384 } 1385 1386 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1387 NULL); 1388 } 1389 1390 /* decrease our supplies ref count and disable if required */ 1391 *supply_rdev_ptr = rdev->supply; 1392 1393 rdev->use_count = 0; 1394 } else if (rdev->use_count > 1) { 1395 1396 if (rdev->constraints && 1397 (rdev->constraints->valid_ops_mask & 1398 REGULATOR_CHANGE_DRMS)) 1399 drms_uA_update(rdev); 1400 1401 rdev->use_count--; 1402 } 1403 return ret; 1404} 1405 1406/** 1407 * regulator_disable - disable regulator output 1408 * @regulator: regulator source 1409 * 1410 * Disable the regulator output voltage or current. Calls to 1411 * regulator_enable() must be balanced with calls to 1412 * regulator_disable(). 1413 * 1414 * NOTE: this will only disable the regulator output if no other consumer 1415 * devices have it enabled, the regulator device supports disabling and 1416 * machine constraints permit this operation. 1417 */ 1418int regulator_disable(struct regulator *regulator) 1419{ 1420 struct regulator_dev *rdev = regulator->rdev; 1421 struct regulator_dev *supply_rdev = NULL; 1422 int ret = 0; 1423 1424 mutex_lock(&rdev->mutex); 1425 ret = _regulator_disable(rdev, &supply_rdev); 1426 mutex_unlock(&rdev->mutex); 1427 1428 /* decrease our supplies ref count and disable if required */ 1429 while (supply_rdev != NULL) { 1430 rdev = supply_rdev; 1431 1432 mutex_lock(&rdev->mutex); 1433 _regulator_disable(rdev, &supply_rdev); 1434 mutex_unlock(&rdev->mutex); 1435 } 1436 1437 return ret; 1438} 1439EXPORT_SYMBOL_GPL(regulator_disable); 1440 1441/* locks held by regulator_force_disable() */ 1442static int _regulator_force_disable(struct regulator_dev *rdev, 1443 struct regulator_dev **supply_rdev_ptr) 1444{ 1445 int ret = 0; 1446 1447 /* force disable */ 1448 if (rdev->desc->ops->disable) { 1449 /* ah well, who wants to live forever... */ 1450 ret = rdev->desc->ops->disable(rdev); 1451 if (ret < 0) { 1452 printk(KERN_ERR "%s: failed to force disable %s\n", 1453 __func__, rdev_get_name(rdev)); 1454 return ret; 1455 } 1456 /* notify other consumers that power has been forced off */ 1457 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1458 REGULATOR_EVENT_DISABLE, NULL); 1459 } 1460 1461 /* decrease our supplies ref count and disable if required */ 1462 *supply_rdev_ptr = rdev->supply; 1463 1464 rdev->use_count = 0; 1465 return ret; 1466} 1467 1468/** 1469 * regulator_force_disable - force disable regulator output 1470 * @regulator: regulator source 1471 * 1472 * Forcibly disable the regulator output voltage or current. 1473 * NOTE: this *will* disable the regulator output even if other consumer 1474 * devices have it enabled. This should be used for situations when device 1475 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1476 */ 1477int regulator_force_disable(struct regulator *regulator) 1478{ 1479 struct regulator_dev *supply_rdev = NULL; 1480 int ret; 1481 1482 mutex_lock(®ulator->rdev->mutex); 1483 regulator->uA_load = 0; 1484 ret = _regulator_force_disable(regulator->rdev, &supply_rdev); 1485 mutex_unlock(®ulator->rdev->mutex); 1486 1487 if (supply_rdev) 1488 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); 1489 1490 return ret; 1491} 1492EXPORT_SYMBOL_GPL(regulator_force_disable); 1493 1494static int _regulator_is_enabled(struct regulator_dev *rdev) 1495{ 1496 /* If we don't know then assume that the regulator is always on */ 1497 if (!rdev->desc->ops->is_enabled) 1498 return 1; 1499 1500 return rdev->desc->ops->is_enabled(rdev); 1501} 1502 1503/** 1504 * regulator_is_enabled - is the regulator output enabled 1505 * @regulator: regulator source 1506 * 1507 * Returns positive if the regulator driver backing the source/client 1508 * has requested that the device be enabled, zero if it hasn't, else a 1509 * negative errno code. 1510 * 1511 * Note that the device backing this regulator handle can have multiple 1512 * users, so it might be enabled even if regulator_enable() was never 1513 * called for this particular source. 1514 */ 1515int regulator_is_enabled(struct regulator *regulator) 1516{ 1517 int ret; 1518 1519 mutex_lock(®ulator->rdev->mutex); 1520 ret = _regulator_is_enabled(regulator->rdev); 1521 mutex_unlock(®ulator->rdev->mutex); 1522 1523 return ret; 1524} 1525EXPORT_SYMBOL_GPL(regulator_is_enabled); 1526 1527/** 1528 * regulator_count_voltages - count regulator_list_voltage() selectors 1529 * @regulator: regulator source 1530 * 1531 * Returns number of selectors, or negative errno. Selectors are 1532 * numbered starting at zero, and typically correspond to bitfields 1533 * in hardware registers. 1534 */ 1535int regulator_count_voltages(struct regulator *regulator) 1536{ 1537 struct regulator_dev *rdev = regulator->rdev; 1538 1539 return rdev->desc->n_voltages ? : -EINVAL; 1540} 1541EXPORT_SYMBOL_GPL(regulator_count_voltages); 1542 1543/** 1544 * regulator_list_voltage - enumerate supported voltages 1545 * @regulator: regulator source 1546 * @selector: identify voltage to list 1547 * Context: can sleep 1548 * 1549 * Returns a voltage that can be passed to @regulator_set_voltage(), 1550 * zero if this selector code can't be used on this system, or a 1551 * negative errno. 1552 */ 1553int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1554{ 1555 struct regulator_dev *rdev = regulator->rdev; 1556 struct regulator_ops *ops = rdev->desc->ops; 1557 int ret; 1558 1559 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1560 return -EINVAL; 1561 1562 mutex_lock(&rdev->mutex); 1563 ret = ops->list_voltage(rdev, selector); 1564 mutex_unlock(&rdev->mutex); 1565 1566 if (ret > 0) { 1567 if (ret < rdev->constraints->min_uV) 1568 ret = 0; 1569 else if (ret > rdev->constraints->max_uV) 1570 ret = 0; 1571 } 1572 1573 return ret; 1574} 1575EXPORT_SYMBOL_GPL(regulator_list_voltage); 1576 1577/** 1578 * regulator_is_supported_voltage - check if a voltage range can be supported 1579 * 1580 * @regulator: Regulator to check. 1581 * @min_uV: Minimum required voltage in uV. 1582 * @max_uV: Maximum required voltage in uV. 1583 * 1584 * Returns a boolean or a negative error code. 1585 */ 1586int regulator_is_supported_voltage(struct regulator *regulator, 1587 int min_uV, int max_uV) 1588{ 1589 int i, voltages, ret; 1590 1591 ret = regulator_count_voltages(regulator); 1592 if (ret < 0) 1593 return ret; 1594 voltages = ret; 1595 1596 for (i = 0; i < voltages; i++) { 1597 ret = regulator_list_voltage(regulator, i); 1598 1599 if (ret >= min_uV && ret <= max_uV) 1600 return 1; 1601 } 1602 1603 return 0; 1604} 1605 1606/** 1607 * regulator_set_voltage - set regulator output voltage 1608 * @regulator: regulator source 1609 * @min_uV: Minimum required voltage in uV 1610 * @max_uV: Maximum acceptable voltage in uV 1611 * 1612 * Sets a voltage regulator to the desired output voltage. This can be set 1613 * during any regulator state. IOW, regulator can be disabled or enabled. 1614 * 1615 * If the regulator is enabled then the voltage will change to the new value 1616 * immediately otherwise if the regulator is disabled the regulator will 1617 * output at the new voltage when enabled. 1618 * 1619 * NOTE: If the regulator is shared between several devices then the lowest 1620 * request voltage that meets the system constraints will be used. 1621 * Regulator system constraints must be set for this regulator before 1622 * calling this function otherwise this call will fail. 1623 */ 1624int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1625{ 1626 struct regulator_dev *rdev = regulator->rdev; 1627 int ret; 1628 1629 mutex_lock(&rdev->mutex); 1630 1631 /* sanity check */ 1632 if (!rdev->desc->ops->set_voltage) { 1633 ret = -EINVAL; 1634 goto out; 1635 } 1636 1637 /* constraints check */ 1638 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1639 if (ret < 0) 1640 goto out; 1641 regulator->min_uV = min_uV; 1642 regulator->max_uV = max_uV; 1643 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1644 1645out: 1646 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1647 mutex_unlock(&rdev->mutex); 1648 return ret; 1649} 1650EXPORT_SYMBOL_GPL(regulator_set_voltage); 1651 1652static int _regulator_get_voltage(struct regulator_dev *rdev) 1653{ 1654 /* sanity check */ 1655 if (rdev->desc->ops->get_voltage) 1656 return rdev->desc->ops->get_voltage(rdev); 1657 else 1658 return -EINVAL; 1659} 1660 1661/** 1662 * regulator_get_voltage - get regulator output voltage 1663 * @regulator: regulator source 1664 * 1665 * This returns the current regulator voltage in uV. 1666 * 1667 * NOTE: If the regulator is disabled it will return the voltage value. This 1668 * function should not be used to determine regulator state. 1669 */ 1670int regulator_get_voltage(struct regulator *regulator) 1671{ 1672 int ret; 1673 1674 mutex_lock(®ulator->rdev->mutex); 1675 1676 ret = _regulator_get_voltage(regulator->rdev); 1677 1678 mutex_unlock(®ulator->rdev->mutex); 1679 1680 return ret; 1681} 1682EXPORT_SYMBOL_GPL(regulator_get_voltage); 1683 1684/** 1685 * regulator_set_current_limit - set regulator output current limit 1686 * @regulator: regulator source 1687 * @min_uA: Minimuum supported current in uA 1688 * @max_uA: Maximum supported current in uA 1689 * 1690 * Sets current sink to the desired output current. This can be set during 1691 * any regulator state. IOW, regulator can be disabled or enabled. 1692 * 1693 * If the regulator is enabled then the current will change to the new value 1694 * immediately otherwise if the regulator is disabled the regulator will 1695 * output at the new current when enabled. 1696 * 1697 * NOTE: Regulator system constraints must be set for this regulator before 1698 * calling this function otherwise this call will fail. 1699 */ 1700int regulator_set_current_limit(struct regulator *regulator, 1701 int min_uA, int max_uA) 1702{ 1703 struct regulator_dev *rdev = regulator->rdev; 1704 int ret; 1705 1706 mutex_lock(&rdev->mutex); 1707 1708 /* sanity check */ 1709 if (!rdev->desc->ops->set_current_limit) { 1710 ret = -EINVAL; 1711 goto out; 1712 } 1713 1714 /* constraints check */ 1715 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1716 if (ret < 0) 1717 goto out; 1718 1719 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1720out: 1721 mutex_unlock(&rdev->mutex); 1722 return ret; 1723} 1724EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1725 1726static int _regulator_get_current_limit(struct regulator_dev *rdev) 1727{ 1728 int ret; 1729 1730 mutex_lock(&rdev->mutex); 1731 1732 /* sanity check */ 1733 if (!rdev->desc->ops->get_current_limit) { 1734 ret = -EINVAL; 1735 goto out; 1736 } 1737 1738 ret = rdev->desc->ops->get_current_limit(rdev); 1739out: 1740 mutex_unlock(&rdev->mutex); 1741 return ret; 1742} 1743 1744/** 1745 * regulator_get_current_limit - get regulator output current 1746 * @regulator: regulator source 1747 * 1748 * This returns the current supplied by the specified current sink in uA. 1749 * 1750 * NOTE: If the regulator is disabled it will return the current value. This 1751 * function should not be used to determine regulator state. 1752 */ 1753int regulator_get_current_limit(struct regulator *regulator) 1754{ 1755 return _regulator_get_current_limit(regulator->rdev); 1756} 1757EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1758 1759/** 1760 * regulator_set_mode - set regulator operating mode 1761 * @regulator: regulator source 1762 * @mode: operating mode - one of the REGULATOR_MODE constants 1763 * 1764 * Set regulator operating mode to increase regulator efficiency or improve 1765 * regulation performance. 1766 * 1767 * NOTE: Regulator system constraints must be set for this regulator before 1768 * calling this function otherwise this call will fail. 1769 */ 1770int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1771{ 1772 struct regulator_dev *rdev = regulator->rdev; 1773 int ret; 1774 int regulator_curr_mode; 1775 1776 mutex_lock(&rdev->mutex); 1777 1778 /* sanity check */ 1779 if (!rdev->desc->ops->set_mode) { 1780 ret = -EINVAL; 1781 goto out; 1782 } 1783 1784 /* return if the same mode is requested */ 1785 if (rdev->desc->ops->get_mode) { 1786 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1787 if (regulator_curr_mode == mode) { 1788 ret = 0; 1789 goto out; 1790 } 1791 } 1792 1793 /* constraints check */ 1794 ret = regulator_check_mode(rdev, mode); 1795 if (ret < 0) 1796 goto out; 1797 1798 ret = rdev->desc->ops->set_mode(rdev, mode); 1799out: 1800 mutex_unlock(&rdev->mutex); 1801 return ret; 1802} 1803EXPORT_SYMBOL_GPL(regulator_set_mode); 1804 1805static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1806{ 1807 int ret; 1808 1809 mutex_lock(&rdev->mutex); 1810 1811 /* sanity check */ 1812 if (!rdev->desc->ops->get_mode) { 1813 ret = -EINVAL; 1814 goto out; 1815 } 1816 1817 ret = rdev->desc->ops->get_mode(rdev); 1818out: 1819 mutex_unlock(&rdev->mutex); 1820 return ret; 1821} 1822 1823/** 1824 * regulator_get_mode - get regulator operating mode 1825 * @regulator: regulator source 1826 * 1827 * Get the current regulator operating mode. 1828 */ 1829unsigned int regulator_get_mode(struct regulator *regulator) 1830{ 1831 return _regulator_get_mode(regulator->rdev); 1832} 1833EXPORT_SYMBOL_GPL(regulator_get_mode); 1834 1835/** 1836 * regulator_set_optimum_mode - set regulator optimum operating mode 1837 * @regulator: regulator source 1838 * @uA_load: load current 1839 * 1840 * Notifies the regulator core of a new device load. This is then used by 1841 * DRMS (if enabled by constraints) to set the most efficient regulator 1842 * operating mode for the new regulator loading. 1843 * 1844 * Consumer devices notify their supply regulator of the maximum power 1845 * they will require (can be taken from device datasheet in the power 1846 * consumption tables) when they change operational status and hence power 1847 * state. Examples of operational state changes that can affect power 1848 * consumption are :- 1849 * 1850 * o Device is opened / closed. 1851 * o Device I/O is about to begin or has just finished. 1852 * o Device is idling in between work. 1853 * 1854 * This information is also exported via sysfs to userspace. 1855 * 1856 * DRMS will sum the total requested load on the regulator and change 1857 * to the most efficient operating mode if platform constraints allow. 1858 * 1859 * Returns the new regulator mode or error. 1860 */ 1861int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1862{ 1863 struct regulator_dev *rdev = regulator->rdev; 1864 struct regulator *consumer; 1865 int ret, output_uV, input_uV, total_uA_load = 0; 1866 unsigned int mode; 1867 1868 mutex_lock(&rdev->mutex); 1869 1870 regulator->uA_load = uA_load; 1871 ret = regulator_check_drms(rdev); 1872 if (ret < 0) 1873 goto out; 1874 ret = -EINVAL; 1875 1876 /* sanity check */ 1877 if (!rdev->desc->ops->get_optimum_mode) 1878 goto out; 1879 1880 /* get output voltage */ 1881 output_uV = rdev->desc->ops->get_voltage(rdev); 1882 if (output_uV <= 0) { 1883 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1884 __func__, rdev_get_name(rdev)); 1885 goto out; 1886 } 1887 1888 /* get input voltage */ 1889 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1890 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1891 else 1892 input_uV = rdev->constraints->input_uV; 1893 if (input_uV <= 0) { 1894 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1895 __func__, rdev_get_name(rdev)); 1896 goto out; 1897 } 1898 1899 /* calc total requested load for this regulator */ 1900 list_for_each_entry(consumer, &rdev->consumer_list, list) 1901 total_uA_load += consumer->uA_load; 1902 1903 mode = rdev->desc->ops->get_optimum_mode(rdev, 1904 input_uV, output_uV, 1905 total_uA_load); 1906 ret = regulator_check_mode(rdev, mode); 1907 if (ret < 0) { 1908 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1909 " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1910 total_uA_load, input_uV, output_uV); 1911 goto out; 1912 } 1913 1914 ret = rdev->desc->ops->set_mode(rdev, mode); 1915 if (ret < 0) { 1916 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1917 __func__, mode, rdev_get_name(rdev)); 1918 goto out; 1919 } 1920 ret = mode; 1921out: 1922 mutex_unlock(&rdev->mutex); 1923 return ret; 1924} 1925EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1926 1927/** 1928 * regulator_register_notifier - register regulator event notifier 1929 * @regulator: regulator source 1930 * @nb: notifier block 1931 * 1932 * Register notifier block to receive regulator events. 1933 */ 1934int regulator_register_notifier(struct regulator *regulator, 1935 struct notifier_block *nb) 1936{ 1937 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1938 nb); 1939} 1940EXPORT_SYMBOL_GPL(regulator_register_notifier); 1941 1942/** 1943 * regulator_unregister_notifier - unregister regulator event notifier 1944 * @regulator: regulator source 1945 * @nb: notifier block 1946 * 1947 * Unregister regulator event notifier block. 1948 */ 1949int regulator_unregister_notifier(struct regulator *regulator, 1950 struct notifier_block *nb) 1951{ 1952 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1953 nb); 1954} 1955EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1956 1957/* notify regulator consumers and downstream regulator consumers. 1958 * Note mutex must be held by caller. 1959 */ 1960static void _notifier_call_chain(struct regulator_dev *rdev, 1961 unsigned long event, void *data) 1962{ 1963 struct regulator_dev *_rdev; 1964 1965 /* call rdev chain first */ 1966 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1967 1968 /* now notify regulator we supply */ 1969 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1970 mutex_lock(&_rdev->mutex); 1971 _notifier_call_chain(_rdev, event, data); 1972 mutex_unlock(&_rdev->mutex); 1973 } 1974} 1975 1976/** 1977 * regulator_bulk_get - get multiple regulator consumers 1978 * 1979 * @dev: Device to supply 1980 * @num_consumers: Number of consumers to register 1981 * @consumers: Configuration of consumers; clients are stored here. 1982 * 1983 * @return 0 on success, an errno on failure. 1984 * 1985 * This helper function allows drivers to get several regulator 1986 * consumers in one operation. If any of the regulators cannot be 1987 * acquired then any regulators that were allocated will be freed 1988 * before returning to the caller. 1989 */ 1990int regulator_bulk_get(struct device *dev, int num_consumers, 1991 struct regulator_bulk_data *consumers) 1992{ 1993 int i; 1994 int ret; 1995 1996 for (i = 0; i < num_consumers; i++) 1997 consumers[i].consumer = NULL; 1998 1999 for (i = 0; i < num_consumers; i++) { 2000 consumers[i].consumer = regulator_get(dev, 2001 consumers[i].supply); 2002 if (IS_ERR(consumers[i].consumer)) { 2003 ret = PTR_ERR(consumers[i].consumer); 2004 dev_err(dev, "Failed to get supply '%s': %d\n", 2005 consumers[i].supply, ret); 2006 consumers[i].consumer = NULL; 2007 goto err; 2008 } 2009 } 2010 2011 return 0; 2012 2013err: 2014 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2015 regulator_put(consumers[i].consumer); 2016 2017 return ret; 2018} 2019EXPORT_SYMBOL_GPL(regulator_bulk_get); 2020 2021/** 2022 * regulator_bulk_enable - enable multiple regulator consumers 2023 * 2024 * @num_consumers: Number of consumers 2025 * @consumers: Consumer data; clients are stored here. 2026 * @return 0 on success, an errno on failure 2027 * 2028 * This convenience API allows consumers to enable multiple regulator 2029 * clients in a single API call. If any consumers cannot be enabled 2030 * then any others that were enabled will be disabled again prior to 2031 * return. 2032 */ 2033int regulator_bulk_enable(int num_consumers, 2034 struct regulator_bulk_data *consumers) 2035{ 2036 int i; 2037 int ret; 2038 2039 for (i = 0; i < num_consumers; i++) { 2040 ret = regulator_enable(consumers[i].consumer); 2041 if (ret != 0) 2042 goto err; 2043 } 2044 2045 return 0; 2046 2047err: 2048 printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2049 for (--i; i >= 0; --i) 2050 regulator_disable(consumers[i].consumer); 2051 2052 return ret; 2053} 2054EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2055 2056/** 2057 * regulator_bulk_disable - disable multiple regulator consumers 2058 * 2059 * @num_consumers: Number of consumers 2060 * @consumers: Consumer data; clients are stored here. 2061 * @return 0 on success, an errno on failure 2062 * 2063 * This convenience API allows consumers to disable multiple regulator 2064 * clients in a single API call. If any consumers cannot be enabled 2065 * then any others that were disabled will be disabled again prior to 2066 * return. 2067 */ 2068int regulator_bulk_disable(int num_consumers, 2069 struct regulator_bulk_data *consumers) 2070{ 2071 int i; 2072 int ret; 2073 2074 for (i = 0; i < num_consumers; i++) { 2075 ret = regulator_disable(consumers[i].consumer); 2076 if (ret != 0) 2077 goto err; 2078 } 2079 2080 return 0; 2081 2082err: 2083 printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 2084 ret); 2085 for (--i; i >= 0; --i) 2086 regulator_enable(consumers[i].consumer); 2087 2088 return ret; 2089} 2090EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2091 2092/** 2093 * regulator_bulk_free - free multiple regulator consumers 2094 * 2095 * @num_consumers: Number of consumers 2096 * @consumers: Consumer data; clients are stored here. 2097 * 2098 * This convenience API allows consumers to free multiple regulator 2099 * clients in a single API call. 2100 */ 2101void regulator_bulk_free(int num_consumers, 2102 struct regulator_bulk_data *consumers) 2103{ 2104 int i; 2105 2106 for (i = 0; i < num_consumers; i++) { 2107 regulator_put(consumers[i].consumer); 2108 consumers[i].consumer = NULL; 2109 } 2110} 2111EXPORT_SYMBOL_GPL(regulator_bulk_free); 2112 2113/** 2114 * regulator_notifier_call_chain - call regulator event notifier 2115 * @rdev: regulator source 2116 * @event: notifier block 2117 * @data: callback-specific data. 2118 * 2119 * Called by regulator drivers to notify clients a regulator event has 2120 * occurred. We also notify regulator clients downstream. 2121 * Note lock must be held by caller. 2122 */ 2123int regulator_notifier_call_chain(struct regulator_dev *rdev, 2124 unsigned long event, void *data) 2125{ 2126 _notifier_call_chain(rdev, event, data); 2127 return NOTIFY_DONE; 2128 2129} 2130EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2131 2132/** 2133 * regulator_mode_to_status - convert a regulator mode into a status 2134 * 2135 * @mode: Mode to convert 2136 * 2137 * Convert a regulator mode into a status. 2138 */ 2139int regulator_mode_to_status(unsigned int mode) 2140{ 2141 switch (mode) { 2142 case REGULATOR_MODE_FAST: 2143 return REGULATOR_STATUS_FAST; 2144 case REGULATOR_MODE_NORMAL: 2145 return REGULATOR_STATUS_NORMAL; 2146 case REGULATOR_MODE_IDLE: 2147 return REGULATOR_STATUS_IDLE; 2148 case REGULATOR_STATUS_STANDBY: 2149 return REGULATOR_STATUS_STANDBY; 2150 default: 2151 return 0; 2152 } 2153} 2154EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2155 2156/* 2157 * To avoid cluttering sysfs (and memory) with useless state, only 2158 * create attributes that can be meaningfully displayed. 2159 */ 2160static int add_regulator_attributes(struct regulator_dev *rdev) 2161{ 2162 struct device *dev = &rdev->dev; 2163 struct regulator_ops *ops = rdev->desc->ops; 2164 int status = 0; 2165 2166 /* some attributes need specific methods to be displayed */ 2167 if (ops->get_voltage) { 2168 status = device_create_file(dev, &dev_attr_microvolts); 2169 if (status < 0) 2170 return status; 2171 } 2172 if (ops->get_current_limit) { 2173 status = device_create_file(dev, &dev_attr_microamps); 2174 if (status < 0) 2175 return status; 2176 } 2177 if (ops->get_mode) { 2178 status = device_create_file(dev, &dev_attr_opmode); 2179 if (status < 0) 2180 return status; 2181 } 2182 if (ops->is_enabled) { 2183 status = device_create_file(dev, &dev_attr_state); 2184 if (status < 0) 2185 return status; 2186 } 2187 if (ops->get_status) { 2188 status = device_create_file(dev, &dev_attr_status); 2189 if (status < 0) 2190 return status; 2191 } 2192 2193 /* some attributes are type-specific */ 2194 if (rdev->desc->type == REGULATOR_CURRENT) { 2195 status = device_create_file(dev, &dev_attr_requested_microamps); 2196 if (status < 0) 2197 return status; 2198 } 2199 2200 /* all the other attributes exist to support constraints; 2201 * don't show them if there are no constraints, or if the 2202 * relevant supporting methods are missing. 2203 */ 2204 if (!rdev->constraints) 2205 return status; 2206 2207 /* constraints need specific supporting methods */ 2208 if (ops->set_voltage) { 2209 status = device_create_file(dev, &dev_attr_min_microvolts); 2210 if (status < 0) 2211 return status; 2212 status = device_create_file(dev, &dev_attr_max_microvolts); 2213 if (status < 0) 2214 return status; 2215 } 2216 if (ops->set_current_limit) { 2217 status = device_create_file(dev, &dev_attr_min_microamps); 2218 if (status < 0) 2219 return status; 2220 status = device_create_file(dev, &dev_attr_max_microamps); 2221 if (status < 0) 2222 return status; 2223 } 2224 2225 /* suspend mode constraints need multiple supporting methods */ 2226 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2227 return status; 2228 2229 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2230 if (status < 0) 2231 return status; 2232 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2233 if (status < 0) 2234 return status; 2235 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2236 if (status < 0) 2237 return status; 2238 2239 if (ops->set_suspend_voltage) { 2240 status = device_create_file(dev, 2241 &dev_attr_suspend_standby_microvolts); 2242 if (status < 0) 2243 return status; 2244 status = device_create_file(dev, 2245 &dev_attr_suspend_mem_microvolts); 2246 if (status < 0) 2247 return status; 2248 status = device_create_file(dev, 2249 &dev_attr_suspend_disk_microvolts); 2250 if (status < 0) 2251 return status; 2252 } 2253 2254 if (ops->set_suspend_mode) { 2255 status = device_create_file(dev, 2256 &dev_attr_suspend_standby_mode); 2257 if (status < 0) 2258 return status; 2259 status = device_create_file(dev, 2260 &dev_attr_suspend_mem_mode); 2261 if (status < 0) 2262 return status; 2263 status = device_create_file(dev, 2264 &dev_attr_suspend_disk_mode); 2265 if (status < 0) 2266 return status; 2267 } 2268 2269 return status; 2270} 2271 2272/** 2273 * regulator_register - register regulator 2274 * @regulator_desc: regulator to register 2275 * @dev: struct device for the regulator 2276 * @init_data: platform provided init data, passed through by driver 2277 * @driver_data: private regulator data 2278 * 2279 * Called by regulator drivers to register a regulator. 2280 * Returns 0 on success. 2281 */ 2282struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2283 struct device *dev, struct regulator_init_data *init_data, 2284 void *driver_data) 2285{ 2286 static atomic_t regulator_no = ATOMIC_INIT(0); 2287 struct regulator_dev *rdev; 2288 int ret, i; 2289 2290 if (regulator_desc == NULL) 2291 return ERR_PTR(-EINVAL); 2292 2293 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2294 return ERR_PTR(-EINVAL); 2295 2296 if (regulator_desc->type != REGULATOR_VOLTAGE && 2297 regulator_desc->type != REGULATOR_CURRENT) 2298 return ERR_PTR(-EINVAL); 2299 2300 if (!init_data) 2301 return ERR_PTR(-EINVAL); 2302 2303 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2304 if (rdev == NULL) 2305 return ERR_PTR(-ENOMEM); 2306 2307 mutex_lock(®ulator_list_mutex); 2308 2309 mutex_init(&rdev->mutex); 2310 rdev->reg_data = driver_data; 2311 rdev->owner = regulator_desc->owner; 2312 rdev->desc = regulator_desc; 2313 INIT_LIST_HEAD(&rdev->consumer_list); 2314 INIT_LIST_HEAD(&rdev->supply_list); 2315 INIT_LIST_HEAD(&rdev->list); 2316 INIT_LIST_HEAD(&rdev->slist); 2317 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2318 2319 /* preform any regulator specific init */ 2320 if (init_data->regulator_init) { 2321 ret = init_data->regulator_init(rdev->reg_data); 2322 if (ret < 0) 2323 goto clean; 2324 } 2325 2326 /* register with sysfs */ 2327 rdev->dev.class = ®ulator_class; 2328 rdev->dev.parent = dev; 2329 dev_set_name(&rdev->dev, "regulator.%d", 2330 atomic_inc_return(®ulator_no) - 1); 2331 ret = device_register(&rdev->dev); 2332 if (ret != 0) { 2333 put_device(&rdev->dev); 2334 goto clean; 2335 } 2336 2337 dev_set_drvdata(&rdev->dev, rdev); 2338 2339 /* set regulator constraints */ 2340 ret = set_machine_constraints(rdev, &init_data->constraints); 2341 if (ret < 0) 2342 goto scrub; 2343 2344 /* add attributes supported by this regulator */ 2345 ret = add_regulator_attributes(rdev); 2346 if (ret < 0) 2347 goto scrub; 2348 2349 /* set supply regulator if it exists */ 2350 if (init_data->supply_regulator && init_data->supply_regulator_dev) { 2351 dev_err(dev, 2352 "Supply regulator specified by both name and dev\n"); 2353 ret = -EINVAL; 2354 goto scrub; 2355 } 2356 2357 if (init_data->supply_regulator) { 2358 struct regulator_dev *r; 2359 int found = 0; 2360 2361 list_for_each_entry(r, ®ulator_list, list) { 2362 if (strcmp(rdev_get_name(r), 2363 init_data->supply_regulator) == 0) { 2364 found = 1; 2365 break; 2366 } 2367 } 2368 2369 if (!found) { 2370 dev_err(dev, "Failed to find supply %s\n", 2371 init_data->supply_regulator); 2372 ret = -ENODEV; 2373 goto scrub; 2374 } 2375 2376 ret = set_supply(rdev, r); 2377 if (ret < 0) 2378 goto scrub; 2379 } 2380 2381 if (init_data->supply_regulator_dev) { 2382 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2383 ret = set_supply(rdev, 2384 dev_get_drvdata(init_data->supply_regulator_dev)); 2385 if (ret < 0) 2386 goto scrub; 2387 } 2388 2389 /* add consumers devices */ 2390 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2391 ret = set_consumer_device_supply(rdev, 2392 init_data->consumer_supplies[i].dev, 2393 init_data->consumer_supplies[i].dev_name, 2394 init_data->consumer_supplies[i].supply); 2395 if (ret < 0) 2396 goto unset_supplies; 2397 } 2398 2399 list_add(&rdev->list, ®ulator_list); 2400out: 2401 mutex_unlock(®ulator_list_mutex); 2402 return rdev; 2403 2404unset_supplies: 2405 unset_regulator_supplies(rdev); 2406 2407scrub: 2408 device_unregister(&rdev->dev); 2409 /* device core frees rdev */ 2410 rdev = ERR_PTR(ret); 2411 goto out; 2412 2413clean: 2414 kfree(rdev); 2415 rdev = ERR_PTR(ret); 2416 goto out; 2417} 2418EXPORT_SYMBOL_GPL(regulator_register); 2419 2420/** 2421 * regulator_unregister - unregister regulator 2422 * @rdev: regulator to unregister 2423 * 2424 * Called by regulator drivers to unregister a regulator. 2425 */ 2426void regulator_unregister(struct regulator_dev *rdev) 2427{ 2428 if (rdev == NULL) 2429 return; 2430 2431 mutex_lock(®ulator_list_mutex); 2432 WARN_ON(rdev->open_count); 2433 unset_regulator_supplies(rdev); 2434 list_del(&rdev->list); 2435 if (rdev->supply) 2436 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2437 device_unregister(&rdev->dev); 2438 mutex_unlock(®ulator_list_mutex); 2439} 2440EXPORT_SYMBOL_GPL(regulator_unregister); 2441 2442/** 2443 * regulator_suspend_prepare - prepare regulators for system wide suspend 2444 * @state: system suspend state 2445 * 2446 * Configure each regulator with it's suspend operating parameters for state. 2447 * This will usually be called by machine suspend code prior to supending. 2448 */ 2449int regulator_suspend_prepare(suspend_state_t state) 2450{ 2451 struct regulator_dev *rdev; 2452 int ret = 0; 2453 2454 /* ON is handled by regulator active state */ 2455 if (state == PM_SUSPEND_ON) 2456 return -EINVAL; 2457 2458 mutex_lock(®ulator_list_mutex); 2459 list_for_each_entry(rdev, ®ulator_list, list) { 2460 2461 mutex_lock(&rdev->mutex); 2462 ret = suspend_prepare(rdev, state); 2463 mutex_unlock(&rdev->mutex); 2464 2465 if (ret < 0) { 2466 printk(KERN_ERR "%s: failed to prepare %s\n", 2467 __func__, rdev_get_name(rdev)); 2468 goto out; 2469 } 2470 } 2471out: 2472 mutex_unlock(®ulator_list_mutex); 2473 return ret; 2474} 2475EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2476 2477/** 2478 * regulator_has_full_constraints - the system has fully specified constraints 2479 * 2480 * Calling this function will cause the regulator API to disable all 2481 * regulators which have a zero use count and don't have an always_on 2482 * constraint in a late_initcall. 2483 * 2484 * The intention is that this will become the default behaviour in a 2485 * future kernel release so users are encouraged to use this facility 2486 * now. 2487 */ 2488void regulator_has_full_constraints(void) 2489{ 2490 has_full_constraints = 1; 2491} 2492EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2493 2494/** 2495 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2496 * 2497 * Calling this function will cause the regulator API to provide a 2498 * dummy regulator to consumers if no physical regulator is found, 2499 * allowing most consumers to proceed as though a regulator were 2500 * configured. This allows systems such as those with software 2501 * controllable regulators for the CPU core only to be brought up more 2502 * readily. 2503 */ 2504void regulator_use_dummy_regulator(void) 2505{ 2506 board_wants_dummy_regulator = true; 2507} 2508EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2509 2510/** 2511 * rdev_get_drvdata - get rdev regulator driver data 2512 * @rdev: regulator 2513 * 2514 * Get rdev regulator driver private data. This call can be used in the 2515 * regulator driver context. 2516 */ 2517void *rdev_get_drvdata(struct regulator_dev *rdev) 2518{ 2519 return rdev->reg_data; 2520} 2521EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2522 2523/** 2524 * regulator_get_drvdata - get regulator driver data 2525 * @regulator: regulator 2526 * 2527 * Get regulator driver private data. This call can be used in the consumer 2528 * driver context when non API regulator specific functions need to be called. 2529 */ 2530void *regulator_get_drvdata(struct regulator *regulator) 2531{ 2532 return regulator->rdev->reg_data; 2533} 2534EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2535 2536/** 2537 * regulator_set_drvdata - set regulator driver data 2538 * @regulator: regulator 2539 * @data: data 2540 */ 2541void regulator_set_drvdata(struct regulator *regulator, void *data) 2542{ 2543 regulator->rdev->reg_data = data; 2544} 2545EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2546 2547/** 2548 * regulator_get_id - get regulator ID 2549 * @rdev: regulator 2550 */ 2551int rdev_get_id(struct regulator_dev *rdev) 2552{ 2553 return rdev->desc->id; 2554} 2555EXPORT_SYMBOL_GPL(rdev_get_id); 2556 2557struct device *rdev_get_dev(struct regulator_dev *rdev) 2558{ 2559 return &rdev->dev; 2560} 2561EXPORT_SYMBOL_GPL(rdev_get_dev); 2562 2563void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2564{ 2565 return reg_init_data->driver_data; 2566} 2567EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2568 2569static int __init regulator_init(void) 2570{ 2571 int ret; 2572 2573 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2574 2575 ret = class_register(®ulator_class); 2576 2577 regulator_dummy_init(); 2578 2579 return ret; 2580} 2581 2582/* init early to allow our consumers to complete system booting */ 2583core_initcall(regulator_init); 2584 2585static int __init regulator_init_complete(void) 2586{ 2587 struct regulator_dev *rdev; 2588 struct regulator_ops *ops; 2589 struct regulation_constraints *c; 2590 int enabled, ret; 2591 const char *name; 2592 2593 mutex_lock(®ulator_list_mutex); 2594 2595 /* If we have a full configuration then disable any regulators 2596 * which are not in use or always_on. This will become the 2597 * default behaviour in the future. 2598 */ 2599 list_for_each_entry(rdev, ®ulator_list, list) { 2600 ops = rdev->desc->ops; 2601 c = rdev->constraints; 2602 2603 name = rdev_get_name(rdev); 2604 2605 if (!ops->disable || (c && c->always_on)) 2606 continue; 2607 2608 mutex_lock(&rdev->mutex); 2609 2610 if (rdev->use_count) 2611 goto unlock; 2612 2613 /* If we can't read the status assume it's on. */ 2614 if (ops->is_enabled) 2615 enabled = ops->is_enabled(rdev); 2616 else 2617 enabled = 1; 2618 2619 if (!enabled) 2620 goto unlock; 2621 2622 if (has_full_constraints) { 2623 /* We log since this may kill the system if it 2624 * goes wrong. */ 2625 printk(KERN_INFO "%s: disabling %s\n", 2626 __func__, name); 2627 ret = ops->disable(rdev); 2628 if (ret != 0) { 2629 printk(KERN_ERR 2630 "%s: couldn't disable %s: %d\n", 2631 __func__, name, ret); 2632 } 2633 } else { 2634 /* The intention is that in future we will 2635 * assume that full constraints are provided 2636 * so warn even if we aren't going to do 2637 * anything here. 2638 */ 2639 printk(KERN_WARNING 2640 "%s: incomplete constraints, leaving %s on\n", 2641 __func__, name); 2642 } 2643 2644unlock: 2645 mutex_unlock(&rdev->mutex); 2646 } 2647 2648 mutex_unlock(®ulator_list_mutex); 2649 2650 return 0; 2651} 2652late_initcall(regulator_init_complete); 2653