core.c revision 500b4ac90d1103a7c302d5bb16c53f4ffc45d057
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; 36 37/* 38 * struct regulator_map 39 * 40 * Used to provide symbolic supply names to devices. 41 */ 42struct regulator_map { 43 struct list_head list; 44 const char *dev_name; /* The dev_name() for the consumer */ 45 const char *supply; 46 struct regulator_dev *regulator; 47}; 48 49/* 50 * struct regulator 51 * 52 * One for each consumer device. 53 */ 54struct regulator { 55 struct device *dev; 56 struct list_head list; 57 int uA_load; 58 int min_uV; 59 int max_uV; 60 char *supply_name; 61 struct device_attribute dev_attr; 62 struct regulator_dev *rdev; 63}; 64 65static int _regulator_is_enabled(struct regulator_dev *rdev); 66static int _regulator_disable(struct regulator_dev *rdev); 67static int _regulator_get_voltage(struct regulator_dev *rdev); 68static int _regulator_get_current_limit(struct regulator_dev *rdev); 69static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 70static void _notifier_call_chain(struct regulator_dev *rdev, 71 unsigned long event, void *data); 72 73static const char *rdev_get_name(struct regulator_dev *rdev) 74{ 75 if (rdev->constraints && rdev->constraints->name) 76 return rdev->constraints->name; 77 else if (rdev->desc->name) 78 return rdev->desc->name; 79 else 80 return ""; 81} 82 83/* gets the regulator for a given consumer device */ 84static struct regulator *get_device_regulator(struct device *dev) 85{ 86 struct regulator *regulator = NULL; 87 struct regulator_dev *rdev; 88 89 mutex_lock(®ulator_list_mutex); 90 list_for_each_entry(rdev, ®ulator_list, list) { 91 mutex_lock(&rdev->mutex); 92 list_for_each_entry(regulator, &rdev->consumer_list, list) { 93 if (regulator->dev == dev) { 94 mutex_unlock(&rdev->mutex); 95 mutex_unlock(®ulator_list_mutex); 96 return regulator; 97 } 98 } 99 mutex_unlock(&rdev->mutex); 100 } 101 mutex_unlock(®ulator_list_mutex); 102 return NULL; 103} 104 105/* Platform voltage constraint check */ 106static int regulator_check_voltage(struct regulator_dev *rdev, 107 int *min_uV, int *max_uV) 108{ 109 BUG_ON(*min_uV > *max_uV); 110 111 if (!rdev->constraints) { 112 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 113 rdev_get_name(rdev)); 114 return -ENODEV; 115 } 116 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 117 printk(KERN_ERR "%s: operation not allowed for %s\n", 118 __func__, rdev_get_name(rdev)); 119 return -EPERM; 120 } 121 122 if (*max_uV > rdev->constraints->max_uV) 123 *max_uV = rdev->constraints->max_uV; 124 if (*min_uV < rdev->constraints->min_uV) 125 *min_uV = rdev->constraints->min_uV; 126 127 if (*min_uV > *max_uV) 128 return -EINVAL; 129 130 return 0; 131} 132 133/* current constraint check */ 134static int regulator_check_current_limit(struct regulator_dev *rdev, 135 int *min_uA, int *max_uA) 136{ 137 BUG_ON(*min_uA > *max_uA); 138 139 if (!rdev->constraints) { 140 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 141 rdev_get_name(rdev)); 142 return -ENODEV; 143 } 144 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 145 printk(KERN_ERR "%s: operation not allowed for %s\n", 146 __func__, rdev_get_name(rdev)); 147 return -EPERM; 148 } 149 150 if (*max_uA > rdev->constraints->max_uA) 151 *max_uA = rdev->constraints->max_uA; 152 if (*min_uA < rdev->constraints->min_uA) 153 *min_uA = rdev->constraints->min_uA; 154 155 if (*min_uA > *max_uA) 156 return -EINVAL; 157 158 return 0; 159} 160 161/* operating mode constraint check */ 162static int regulator_check_mode(struct regulator_dev *rdev, int mode) 163{ 164 switch (mode) { 165 case REGULATOR_MODE_FAST: 166 case REGULATOR_MODE_NORMAL: 167 case REGULATOR_MODE_IDLE: 168 case REGULATOR_MODE_STANDBY: 169 break; 170 default: 171 return -EINVAL; 172 } 173 174 if (!rdev->constraints) { 175 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 176 rdev_get_name(rdev)); 177 return -ENODEV; 178 } 179 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 180 printk(KERN_ERR "%s: operation not allowed for %s\n", 181 __func__, rdev_get_name(rdev)); 182 return -EPERM; 183 } 184 if (!(rdev->constraints->valid_modes_mask & mode)) { 185 printk(KERN_ERR "%s: invalid mode %x for %s\n", 186 __func__, mode, rdev_get_name(rdev)); 187 return -EINVAL; 188 } 189 return 0; 190} 191 192/* dynamic regulator mode switching constraint check */ 193static int regulator_check_drms(struct regulator_dev *rdev) 194{ 195 if (!rdev->constraints) { 196 printk(KERN_ERR "%s: no constraints for %s\n", __func__, 197 rdev_get_name(rdev)); 198 return -ENODEV; 199 } 200 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 201 printk(KERN_ERR "%s: operation not allowed for %s\n", 202 __func__, rdev_get_name(rdev)); 203 return -EPERM; 204 } 205 return 0; 206} 207 208static ssize_t device_requested_uA_show(struct device *dev, 209 struct device_attribute *attr, char *buf) 210{ 211 struct regulator *regulator; 212 213 regulator = get_device_regulator(dev); 214 if (regulator == NULL) 215 return 0; 216 217 return sprintf(buf, "%d\n", regulator->uA_load); 218} 219 220static ssize_t regulator_uV_show(struct device *dev, 221 struct device_attribute *attr, char *buf) 222{ 223 struct regulator_dev *rdev = dev_get_drvdata(dev); 224 ssize_t ret; 225 226 mutex_lock(&rdev->mutex); 227 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 228 mutex_unlock(&rdev->mutex); 229 230 return ret; 231} 232static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 233 234static ssize_t regulator_uA_show(struct device *dev, 235 struct device_attribute *attr, char *buf) 236{ 237 struct regulator_dev *rdev = dev_get_drvdata(dev); 238 239 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 240} 241static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 242 243static ssize_t regulator_name_show(struct device *dev, 244 struct device_attribute *attr, char *buf) 245{ 246 struct regulator_dev *rdev = dev_get_drvdata(dev); 247 248 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 249} 250 251static ssize_t regulator_print_opmode(char *buf, int mode) 252{ 253 switch (mode) { 254 case REGULATOR_MODE_FAST: 255 return sprintf(buf, "fast\n"); 256 case REGULATOR_MODE_NORMAL: 257 return sprintf(buf, "normal\n"); 258 case REGULATOR_MODE_IDLE: 259 return sprintf(buf, "idle\n"); 260 case REGULATOR_MODE_STANDBY: 261 return sprintf(buf, "standby\n"); 262 } 263 return sprintf(buf, "unknown\n"); 264} 265 266static ssize_t regulator_opmode_show(struct device *dev, 267 struct device_attribute *attr, char *buf) 268{ 269 struct regulator_dev *rdev = dev_get_drvdata(dev); 270 271 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 272} 273static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 274 275static ssize_t regulator_print_state(char *buf, int state) 276{ 277 if (state > 0) 278 return sprintf(buf, "enabled\n"); 279 else if (state == 0) 280 return sprintf(buf, "disabled\n"); 281 else 282 return sprintf(buf, "unknown\n"); 283} 284 285static ssize_t regulator_state_show(struct device *dev, 286 struct device_attribute *attr, char *buf) 287{ 288 struct regulator_dev *rdev = dev_get_drvdata(dev); 289 ssize_t ret; 290 291 mutex_lock(&rdev->mutex); 292 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 293 mutex_unlock(&rdev->mutex); 294 295 return ret; 296} 297static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 298 299static ssize_t regulator_status_show(struct device *dev, 300 struct device_attribute *attr, char *buf) 301{ 302 struct regulator_dev *rdev = dev_get_drvdata(dev); 303 int status; 304 char *label; 305 306 status = rdev->desc->ops->get_status(rdev); 307 if (status < 0) 308 return status; 309 310 switch (status) { 311 case REGULATOR_STATUS_OFF: 312 label = "off"; 313 break; 314 case REGULATOR_STATUS_ON: 315 label = "on"; 316 break; 317 case REGULATOR_STATUS_ERROR: 318 label = "error"; 319 break; 320 case REGULATOR_STATUS_FAST: 321 label = "fast"; 322 break; 323 case REGULATOR_STATUS_NORMAL: 324 label = "normal"; 325 break; 326 case REGULATOR_STATUS_IDLE: 327 label = "idle"; 328 break; 329 case REGULATOR_STATUS_STANDBY: 330 label = "standby"; 331 break; 332 default: 333 return -ERANGE; 334 } 335 336 return sprintf(buf, "%s\n", label); 337} 338static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 339 340static ssize_t regulator_min_uA_show(struct device *dev, 341 struct device_attribute *attr, char *buf) 342{ 343 struct regulator_dev *rdev = dev_get_drvdata(dev); 344 345 if (!rdev->constraints) 346 return sprintf(buf, "constraint not defined\n"); 347 348 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 349} 350static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 351 352static ssize_t regulator_max_uA_show(struct device *dev, 353 struct device_attribute *attr, char *buf) 354{ 355 struct regulator_dev *rdev = dev_get_drvdata(dev); 356 357 if (!rdev->constraints) 358 return sprintf(buf, "constraint not defined\n"); 359 360 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 361} 362static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 363 364static ssize_t regulator_min_uV_show(struct device *dev, 365 struct device_attribute *attr, char *buf) 366{ 367 struct regulator_dev *rdev = dev_get_drvdata(dev); 368 369 if (!rdev->constraints) 370 return sprintf(buf, "constraint not defined\n"); 371 372 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 373} 374static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 375 376static ssize_t regulator_max_uV_show(struct device *dev, 377 struct device_attribute *attr, char *buf) 378{ 379 struct regulator_dev *rdev = dev_get_drvdata(dev); 380 381 if (!rdev->constraints) 382 return sprintf(buf, "constraint not defined\n"); 383 384 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 385} 386static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 387 388static ssize_t regulator_total_uA_show(struct device *dev, 389 struct device_attribute *attr, char *buf) 390{ 391 struct regulator_dev *rdev = dev_get_drvdata(dev); 392 struct regulator *regulator; 393 int uA = 0; 394 395 mutex_lock(&rdev->mutex); 396 list_for_each_entry(regulator, &rdev->consumer_list, list) 397 uA += regulator->uA_load; 398 mutex_unlock(&rdev->mutex); 399 return sprintf(buf, "%d\n", uA); 400} 401static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 402 403static ssize_t regulator_num_users_show(struct device *dev, 404 struct device_attribute *attr, char *buf) 405{ 406 struct regulator_dev *rdev = dev_get_drvdata(dev); 407 return sprintf(buf, "%d\n", rdev->use_count); 408} 409 410static ssize_t regulator_type_show(struct device *dev, 411 struct device_attribute *attr, char *buf) 412{ 413 struct regulator_dev *rdev = dev_get_drvdata(dev); 414 415 switch (rdev->desc->type) { 416 case REGULATOR_VOLTAGE: 417 return sprintf(buf, "voltage\n"); 418 case REGULATOR_CURRENT: 419 return sprintf(buf, "current\n"); 420 } 421 return sprintf(buf, "unknown\n"); 422} 423 424static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 425 struct device_attribute *attr, char *buf) 426{ 427 struct regulator_dev *rdev = dev_get_drvdata(dev); 428 429 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 430} 431static DEVICE_ATTR(suspend_mem_microvolts, 0444, 432 regulator_suspend_mem_uV_show, NULL); 433 434static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 435 struct device_attribute *attr, char *buf) 436{ 437 struct regulator_dev *rdev = dev_get_drvdata(dev); 438 439 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 440} 441static DEVICE_ATTR(suspend_disk_microvolts, 0444, 442 regulator_suspend_disk_uV_show, NULL); 443 444static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 445 struct device_attribute *attr, char *buf) 446{ 447 struct regulator_dev *rdev = dev_get_drvdata(dev); 448 449 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 450} 451static DEVICE_ATTR(suspend_standby_microvolts, 0444, 452 regulator_suspend_standby_uV_show, NULL); 453 454static ssize_t regulator_suspend_mem_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_mem.mode); 461} 462static DEVICE_ATTR(suspend_mem_mode, 0444, 463 regulator_suspend_mem_mode_show, NULL); 464 465static ssize_t regulator_suspend_disk_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_disk.mode); 472} 473static DEVICE_ATTR(suspend_disk_mode, 0444, 474 regulator_suspend_disk_mode_show, NULL); 475 476static ssize_t regulator_suspend_standby_mode_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_opmode(buf, 482 rdev->constraints->state_standby.mode); 483} 484static DEVICE_ATTR(suspend_standby_mode, 0444, 485 regulator_suspend_standby_mode_show, NULL); 486 487static ssize_t regulator_suspend_mem_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_mem.enabled); 494} 495static DEVICE_ATTR(suspend_mem_state, 0444, 496 regulator_suspend_mem_state_show, NULL); 497 498static ssize_t regulator_suspend_disk_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_disk.enabled); 505} 506static DEVICE_ATTR(suspend_disk_state, 0444, 507 regulator_suspend_disk_state_show, NULL); 508 509static ssize_t regulator_suspend_standby_state_show(struct device *dev, 510 struct device_attribute *attr, char *buf) 511{ 512 struct regulator_dev *rdev = dev_get_drvdata(dev); 513 514 return regulator_print_state(buf, 515 rdev->constraints->state_standby.enabled); 516} 517static DEVICE_ATTR(suspend_standby_state, 0444, 518 regulator_suspend_standby_state_show, NULL); 519 520 521/* 522 * These are the only attributes are present for all regulators. 523 * Other attributes are a function of regulator functionality. 524 */ 525static struct device_attribute regulator_dev_attrs[] = { 526 __ATTR(name, 0444, regulator_name_show, NULL), 527 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 528 __ATTR(type, 0444, regulator_type_show, NULL), 529 __ATTR_NULL, 530}; 531 532static void regulator_dev_release(struct device *dev) 533{ 534 struct regulator_dev *rdev = dev_get_drvdata(dev); 535 kfree(rdev); 536} 537 538static struct class regulator_class = { 539 .name = "regulator", 540 .dev_release = regulator_dev_release, 541 .dev_attrs = regulator_dev_attrs, 542}; 543 544/* Calculate the new optimum regulator operating mode based on the new total 545 * consumer load. All locks held by caller */ 546static void drms_uA_update(struct regulator_dev *rdev) 547{ 548 struct regulator *sibling; 549 int current_uA = 0, output_uV, input_uV, err; 550 unsigned int mode; 551 552 err = regulator_check_drms(rdev); 553 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 554 !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 555 return; 556 557 /* get output voltage */ 558 output_uV = rdev->desc->ops->get_voltage(rdev); 559 if (output_uV <= 0) 560 return; 561 562 /* get input voltage */ 563 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 564 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 565 else 566 input_uV = rdev->constraints->input_uV; 567 if (input_uV <= 0) 568 return; 569 570 /* calc total requested load */ 571 list_for_each_entry(sibling, &rdev->consumer_list, list) 572 current_uA += sibling->uA_load; 573 574 /* now get the optimum mode for our new total regulator load */ 575 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 576 output_uV, current_uA); 577 578 /* check the new mode is allowed */ 579 err = regulator_check_mode(rdev, mode); 580 if (err == 0) 581 rdev->desc->ops->set_mode(rdev, mode); 582} 583 584static int suspend_set_state(struct regulator_dev *rdev, 585 struct regulator_state *rstate) 586{ 587 int ret = 0; 588 bool can_set_state; 589 590 can_set_state = rdev->desc->ops->set_suspend_enable && 591 rdev->desc->ops->set_suspend_disable; 592 593 /* If we have no suspend mode configration don't set anything; 594 * only warn if the driver actually makes the suspend mode 595 * configurable. 596 */ 597 if (!rstate->enabled && !rstate->disabled) { 598 if (can_set_state) 599 printk(KERN_WARNING "%s: No configuration for %s\n", 600 __func__, rdev_get_name(rdev)); 601 return 0; 602 } 603 604 if (rstate->enabled && rstate->disabled) { 605 printk(KERN_ERR "%s: invalid configuration for %s\n", 606 __func__, rdev_get_name(rdev)); 607 return -EINVAL; 608 } 609 610 if (!can_set_state) { 611 printk(KERN_ERR "%s: no way to set suspend state\n", 612 __func__); 613 return -EINVAL; 614 } 615 616 if (rstate->enabled) 617 ret = rdev->desc->ops->set_suspend_enable(rdev); 618 else 619 ret = rdev->desc->ops->set_suspend_disable(rdev); 620 if (ret < 0) { 621 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 622 return ret; 623 } 624 625 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 626 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 627 if (ret < 0) { 628 printk(KERN_ERR "%s: failed to set voltage\n", 629 __func__); 630 return ret; 631 } 632 } 633 634 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 635 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 636 if (ret < 0) { 637 printk(KERN_ERR "%s: failed to set mode\n", __func__); 638 return ret; 639 } 640 } 641 return ret; 642} 643 644/* locks held by caller */ 645static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 646{ 647 if (!rdev->constraints) 648 return -EINVAL; 649 650 switch (state) { 651 case PM_SUSPEND_STANDBY: 652 return suspend_set_state(rdev, 653 &rdev->constraints->state_standby); 654 case PM_SUSPEND_MEM: 655 return suspend_set_state(rdev, 656 &rdev->constraints->state_mem); 657 case PM_SUSPEND_MAX: 658 return suspend_set_state(rdev, 659 &rdev->constraints->state_disk); 660 default: 661 return -EINVAL; 662 } 663} 664 665static void print_constraints(struct regulator_dev *rdev) 666{ 667 struct regulation_constraints *constraints = rdev->constraints; 668 char buf[80] = ""; 669 int count = 0; 670 int ret; 671 672 if (constraints->min_uV && constraints->max_uV) { 673 if (constraints->min_uV == constraints->max_uV) 674 count += sprintf(buf + count, "%d mV ", 675 constraints->min_uV / 1000); 676 else 677 count += sprintf(buf + count, "%d <--> %d mV ", 678 constraints->min_uV / 1000, 679 constraints->max_uV / 1000); 680 } 681 682 if (!constraints->min_uV || 683 constraints->min_uV != constraints->max_uV) { 684 ret = _regulator_get_voltage(rdev); 685 if (ret > 0) 686 count += sprintf(buf + count, "at %d mV ", ret / 1000); 687 } 688 689 if (constraints->min_uA && constraints->max_uA) { 690 if (constraints->min_uA == constraints->max_uA) 691 count += sprintf(buf + count, "%d mA ", 692 constraints->min_uA / 1000); 693 else 694 count += sprintf(buf + count, "%d <--> %d mA ", 695 constraints->min_uA / 1000, 696 constraints->max_uA / 1000); 697 } 698 699 if (!constraints->min_uA || 700 constraints->min_uA != constraints->max_uA) { 701 ret = _regulator_get_current_limit(rdev); 702 if (ret > 0) 703 count += sprintf(buf + count, "at %d uA ", ret / 1000); 704 } 705 706 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 707 count += sprintf(buf + count, "fast "); 708 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 709 count += sprintf(buf + count, "normal "); 710 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 711 count += sprintf(buf + count, "idle "); 712 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 713 count += sprintf(buf + count, "standby"); 714 715 printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 716} 717 718static int machine_constraints_voltage(struct regulator_dev *rdev, 719 struct regulation_constraints *constraints) 720{ 721 struct regulator_ops *ops = rdev->desc->ops; 722 const char *name = rdev_get_name(rdev); 723 int ret; 724 725 /* do we need to apply the constraint voltage */ 726 if (rdev->constraints->apply_uV && 727 rdev->constraints->min_uV == rdev->constraints->max_uV && 728 ops->set_voltage) { 729 ret = ops->set_voltage(rdev, 730 rdev->constraints->min_uV, rdev->constraints->max_uV); 731 if (ret < 0) { 732 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 733 __func__, 734 rdev->constraints->min_uV, name); 735 rdev->constraints = NULL; 736 return ret; 737 } 738 } 739 740 /* constrain machine-level voltage specs to fit 741 * the actual range supported by this regulator. 742 */ 743 if (ops->list_voltage && rdev->desc->n_voltages) { 744 int count = rdev->desc->n_voltages; 745 int i; 746 int min_uV = INT_MAX; 747 int max_uV = INT_MIN; 748 int cmin = constraints->min_uV; 749 int cmax = constraints->max_uV; 750 751 /* it's safe to autoconfigure fixed-voltage supplies 752 and the constraints are used by list_voltage. */ 753 if (count == 1 && !cmin) { 754 cmin = 1; 755 cmax = INT_MAX; 756 constraints->min_uV = cmin; 757 constraints->max_uV = cmax; 758 } 759 760 /* voltage constraints are optional */ 761 if ((cmin == 0) && (cmax == 0)) 762 return 0; 763 764 /* else require explicit machine-level constraints */ 765 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 766 pr_err("%s: %s '%s' voltage constraints\n", 767 __func__, "invalid", name); 768 return -EINVAL; 769 } 770 771 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 772 for (i = 0; i < count; i++) { 773 int value; 774 775 value = ops->list_voltage(rdev, i); 776 if (value <= 0) 777 continue; 778 779 /* maybe adjust [min_uV..max_uV] */ 780 if (value >= cmin && value < min_uV) 781 min_uV = value; 782 if (value <= cmax && value > max_uV) 783 max_uV = value; 784 } 785 786 /* final: [min_uV..max_uV] valid iff constraints valid */ 787 if (max_uV < min_uV) { 788 pr_err("%s: %s '%s' voltage constraints\n", 789 __func__, "unsupportable", name); 790 return -EINVAL; 791 } 792 793 /* use regulator's subset of machine constraints */ 794 if (constraints->min_uV < min_uV) { 795 pr_debug("%s: override '%s' %s, %d -> %d\n", 796 __func__, name, "min_uV", 797 constraints->min_uV, min_uV); 798 constraints->min_uV = min_uV; 799 } 800 if (constraints->max_uV > max_uV) { 801 pr_debug("%s: override '%s' %s, %d -> %d\n", 802 __func__, name, "max_uV", 803 constraints->max_uV, max_uV); 804 constraints->max_uV = max_uV; 805 } 806 } 807 808 return 0; 809} 810 811/** 812 * set_machine_constraints - sets regulator constraints 813 * @rdev: regulator source 814 * @constraints: constraints to apply 815 * 816 * Allows platform initialisation code to define and constrain 817 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 818 * Constraints *must* be set by platform code in order for some 819 * regulator operations to proceed i.e. set_voltage, set_current_limit, 820 * set_mode. 821 */ 822static int set_machine_constraints(struct regulator_dev *rdev, 823 struct regulation_constraints *constraints) 824{ 825 int ret = 0; 826 const char *name; 827 struct regulator_ops *ops = rdev->desc->ops; 828 829 rdev->constraints = constraints; 830 831 name = rdev_get_name(rdev); 832 833 ret = machine_constraints_voltage(rdev, constraints); 834 if (ret != 0) 835 goto out; 836 837 /* do we need to setup our suspend state */ 838 if (constraints->initial_state) { 839 ret = suspend_prepare(rdev, constraints->initial_state); 840 if (ret < 0) { 841 printk(KERN_ERR "%s: failed to set suspend state for %s\n", 842 __func__, name); 843 rdev->constraints = NULL; 844 goto out; 845 } 846 } 847 848 if (constraints->initial_mode) { 849 if (!ops->set_mode) { 850 printk(KERN_ERR "%s: no set_mode operation for %s\n", 851 __func__, name); 852 ret = -EINVAL; 853 goto out; 854 } 855 856 ret = ops->set_mode(rdev, constraints->initial_mode); 857 if (ret < 0) { 858 printk(KERN_ERR 859 "%s: failed to set initial mode for %s: %d\n", 860 __func__, name, ret); 861 goto out; 862 } 863 } 864 865 /* If the constraints say the regulator should be on at this point 866 * and we have control then make sure it is enabled. 867 */ 868 if ((constraints->always_on || constraints->boot_on) && ops->enable) { 869 ret = ops->enable(rdev); 870 if (ret < 0) { 871 printk(KERN_ERR "%s: failed to enable %s\n", 872 __func__, name); 873 rdev->constraints = NULL; 874 goto out; 875 } 876 } 877 878 print_constraints(rdev); 879out: 880 return ret; 881} 882 883/** 884 * set_supply - set regulator supply regulator 885 * @rdev: regulator name 886 * @supply_rdev: supply regulator name 887 * 888 * Called by platform initialisation code to set the supply regulator for this 889 * regulator. This ensures that a regulators supply will also be enabled by the 890 * core if it's child is enabled. 891 */ 892static int set_supply(struct regulator_dev *rdev, 893 struct regulator_dev *supply_rdev) 894{ 895 int err; 896 897 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 898 "supply"); 899 if (err) { 900 printk(KERN_ERR 901 "%s: could not add device link %s err %d\n", 902 __func__, supply_rdev->dev.kobj.name, err); 903 goto out; 904 } 905 rdev->supply = supply_rdev; 906 list_add(&rdev->slist, &supply_rdev->supply_list); 907out: 908 return err; 909} 910 911/** 912 * set_consumer_device_supply: Bind a regulator to a symbolic supply 913 * @rdev: regulator source 914 * @consumer_dev: device the supply applies to 915 * @consumer_dev_name: dev_name() string for device supply applies to 916 * @supply: symbolic name for supply 917 * 918 * Allows platform initialisation code to map physical regulator 919 * sources to symbolic names for supplies for use by devices. Devices 920 * should use these symbolic names to request regulators, avoiding the 921 * need to provide board-specific regulator names as platform data. 922 * 923 * Only one of consumer_dev and consumer_dev_name may be specified. 924 */ 925static int set_consumer_device_supply(struct regulator_dev *rdev, 926 struct device *consumer_dev, const char *consumer_dev_name, 927 const char *supply) 928{ 929 struct regulator_map *node; 930 int has_dev; 931 932 if (consumer_dev && consumer_dev_name) 933 return -EINVAL; 934 935 if (!consumer_dev_name && consumer_dev) 936 consumer_dev_name = dev_name(consumer_dev); 937 938 if (supply == NULL) 939 return -EINVAL; 940 941 if (consumer_dev_name != NULL) 942 has_dev = 1; 943 else 944 has_dev = 0; 945 946 list_for_each_entry(node, ®ulator_map_list, list) { 947 if (node->dev_name && consumer_dev_name) { 948 if (strcmp(node->dev_name, consumer_dev_name) != 0) 949 continue; 950 } else if (node->dev_name || consumer_dev_name) { 951 continue; 952 } 953 954 if (strcmp(node->supply, supply) != 0) 955 continue; 956 957 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 958 dev_name(&node->regulator->dev), 959 node->regulator->desc->name, 960 supply, 961 dev_name(&rdev->dev), rdev_get_name(rdev)); 962 return -EBUSY; 963 } 964 965 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 966 if (node == NULL) 967 return -ENOMEM; 968 969 node->regulator = rdev; 970 node->supply = supply; 971 972 if (has_dev) { 973 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 974 if (node->dev_name == NULL) { 975 kfree(node); 976 return -ENOMEM; 977 } 978 } 979 980 list_add(&node->list, ®ulator_map_list); 981 return 0; 982} 983 984static void unset_regulator_supplies(struct regulator_dev *rdev) 985{ 986 struct regulator_map *node, *n; 987 988 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 989 if (rdev == node->regulator) { 990 list_del(&node->list); 991 kfree(node->dev_name); 992 kfree(node); 993 } 994 } 995} 996 997#define REG_STR_SIZE 32 998 999static struct regulator *create_regulator(struct regulator_dev *rdev, 1000 struct device *dev, 1001 const char *supply_name) 1002{ 1003 struct regulator *regulator; 1004 char buf[REG_STR_SIZE]; 1005 int err, size; 1006 1007 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1008 if (regulator == NULL) 1009 return NULL; 1010 1011 mutex_lock(&rdev->mutex); 1012 regulator->rdev = rdev; 1013 list_add(®ulator->list, &rdev->consumer_list); 1014 1015 if (dev) { 1016 /* create a 'requested_microamps_name' sysfs entry */ 1017 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1018 supply_name); 1019 if (size >= REG_STR_SIZE) 1020 goto overflow_err; 1021 1022 regulator->dev = dev; 1023 sysfs_attr_init(®ulator->dev_attr.attr); 1024 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1025 if (regulator->dev_attr.attr.name == NULL) 1026 goto attr_name_err; 1027 1028 regulator->dev_attr.attr.owner = THIS_MODULE; 1029 regulator->dev_attr.attr.mode = 0444; 1030 regulator->dev_attr.show = device_requested_uA_show; 1031 err = device_create_file(dev, ®ulator->dev_attr); 1032 if (err < 0) { 1033 printk(KERN_WARNING "%s: could not add regulator_dev" 1034 " load sysfs\n", __func__); 1035 goto attr_name_err; 1036 } 1037 1038 /* also add a link to the device sysfs entry */ 1039 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1040 dev->kobj.name, supply_name); 1041 if (size >= REG_STR_SIZE) 1042 goto attr_err; 1043 1044 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1045 if (regulator->supply_name == NULL) 1046 goto attr_err; 1047 1048 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1049 buf); 1050 if (err) { 1051 printk(KERN_WARNING 1052 "%s: could not add device link %s err %d\n", 1053 __func__, dev->kobj.name, err); 1054 device_remove_file(dev, ®ulator->dev_attr); 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#ifdef CONFIG_REGULATOR_DUMMY 1113 if (!devname) 1114 devname = "deviceless"; 1115 1116 /* If the board didn't flag that it was fully constrained then 1117 * substitute in a dummy regulator so consumers can continue. 1118 */ 1119 if (!has_full_constraints) { 1120 pr_warning("%s supply %s not found, using dummy regulator\n", 1121 devname, id); 1122 rdev = dummy_regulator_rdev; 1123 goto found; 1124 } 1125#endif 1126 1127 mutex_unlock(®ulator_list_mutex); 1128 return regulator; 1129 1130found: 1131 if (rdev->exclusive) { 1132 regulator = ERR_PTR(-EPERM); 1133 goto out; 1134 } 1135 1136 if (exclusive && rdev->open_count) { 1137 regulator = ERR_PTR(-EBUSY); 1138 goto out; 1139 } 1140 1141 if (!try_module_get(rdev->owner)) 1142 goto out; 1143 1144 regulator = create_regulator(rdev, dev, id); 1145 if (regulator == NULL) { 1146 regulator = ERR_PTR(-ENOMEM); 1147 module_put(rdev->owner); 1148 } 1149 1150 rdev->open_count++; 1151 if (exclusive) { 1152 rdev->exclusive = 1; 1153 1154 ret = _regulator_is_enabled(rdev); 1155 if (ret > 0) 1156 rdev->use_count = 1; 1157 else 1158 rdev->use_count = 0; 1159 } 1160 1161out: 1162 mutex_unlock(®ulator_list_mutex); 1163 1164 return regulator; 1165} 1166 1167/** 1168 * regulator_get - lookup and obtain a reference to a regulator. 1169 * @dev: device for regulator "consumer" 1170 * @id: Supply name or regulator ID. 1171 * 1172 * Returns a struct regulator corresponding to the regulator producer, 1173 * or IS_ERR() condition containing errno. 1174 * 1175 * Use of supply names configured via regulator_set_device_supply() is 1176 * strongly encouraged. It is recommended that the supply name used 1177 * should match the name used for the supply and/or the relevant 1178 * device pins in the datasheet. 1179 */ 1180struct regulator *regulator_get(struct device *dev, const char *id) 1181{ 1182 return _regulator_get(dev, id, 0); 1183} 1184EXPORT_SYMBOL_GPL(regulator_get); 1185 1186/** 1187 * regulator_get_exclusive - obtain exclusive access to a regulator. 1188 * @dev: device for regulator "consumer" 1189 * @id: Supply name or regulator ID. 1190 * 1191 * Returns a struct regulator corresponding to the regulator producer, 1192 * or IS_ERR() condition containing errno. Other consumers will be 1193 * unable to obtain this reference is held and the use count for the 1194 * regulator will be initialised to reflect the current state of the 1195 * regulator. 1196 * 1197 * This is intended for use by consumers which cannot tolerate shared 1198 * use of the regulator such as those which need to force the 1199 * regulator off for correct operation of the hardware they are 1200 * controlling. 1201 * 1202 * Use of supply names configured via regulator_set_device_supply() is 1203 * strongly encouraged. It is recommended that the supply name used 1204 * should match the name used for the supply and/or the relevant 1205 * device pins in the datasheet. 1206 */ 1207struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1208{ 1209 return _regulator_get(dev, id, 1); 1210} 1211EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1212 1213/** 1214 * regulator_put - "free" the regulator source 1215 * @regulator: regulator source 1216 * 1217 * Note: drivers must ensure that all regulator_enable calls made on this 1218 * regulator source are balanced by regulator_disable calls prior to calling 1219 * this function. 1220 */ 1221void regulator_put(struct regulator *regulator) 1222{ 1223 struct regulator_dev *rdev; 1224 1225 if (regulator == NULL || IS_ERR(regulator)) 1226 return; 1227 1228 mutex_lock(®ulator_list_mutex); 1229 rdev = regulator->rdev; 1230 1231 /* remove any sysfs entries */ 1232 if (regulator->dev) { 1233 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1234 kfree(regulator->supply_name); 1235 device_remove_file(regulator->dev, ®ulator->dev_attr); 1236 kfree(regulator->dev_attr.attr.name); 1237 } 1238 list_del(®ulator->list); 1239 kfree(regulator); 1240 1241 rdev->open_count--; 1242 rdev->exclusive = 0; 1243 1244 module_put(rdev->owner); 1245 mutex_unlock(®ulator_list_mutex); 1246} 1247EXPORT_SYMBOL_GPL(regulator_put); 1248 1249static int _regulator_can_change_status(struct regulator_dev *rdev) 1250{ 1251 if (!rdev->constraints) 1252 return 0; 1253 1254 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1255 return 1; 1256 else 1257 return 0; 1258} 1259 1260/* locks held by regulator_enable() */ 1261static int _regulator_enable(struct regulator_dev *rdev) 1262{ 1263 int ret, delay; 1264 1265 /* do we need to enable the supply regulator first */ 1266 if (rdev->supply) { 1267 ret = _regulator_enable(rdev->supply); 1268 if (ret < 0) { 1269 printk(KERN_ERR "%s: failed to enable %s: %d\n", 1270 __func__, rdev_get_name(rdev), ret); 1271 return ret; 1272 } 1273 } 1274 1275 /* check voltage and requested load before enabling */ 1276 if (rdev->constraints && 1277 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1278 drms_uA_update(rdev); 1279 1280 if (rdev->use_count == 0) { 1281 /* The regulator may on if it's not switchable or left on */ 1282 ret = _regulator_is_enabled(rdev); 1283 if (ret == -EINVAL || ret == 0) { 1284 if (!_regulator_can_change_status(rdev)) 1285 return -EPERM; 1286 1287 if (!rdev->desc->ops->enable) 1288 return -EINVAL; 1289 1290 /* Query before enabling in case configuration 1291 * dependant. */ 1292 ret = _regulator_get_enable_time(rdev); 1293 if (ret >= 0) { 1294 delay = ret; 1295 } else { 1296 printk(KERN_WARNING 1297 "%s: enable_time() failed for %s: %d\n", 1298 __func__, rdev_get_name(rdev), 1299 ret); 1300 delay = 0; 1301 } 1302 1303 /* Allow the regulator to ramp; it would be useful 1304 * to extend this for bulk operations so that the 1305 * regulators can ramp together. */ 1306 ret = rdev->desc->ops->enable(rdev); 1307 if (ret < 0) 1308 return ret; 1309 1310 if (delay >= 1000) 1311 mdelay(delay / 1000); 1312 else if (delay) 1313 udelay(delay); 1314 1315 } else if (ret < 0) { 1316 printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 1317 __func__, rdev_get_name(rdev), ret); 1318 return ret; 1319 } 1320 /* Fallthrough on positive return values - already enabled */ 1321 } 1322 1323 rdev->use_count++; 1324 1325 return 0; 1326} 1327 1328/** 1329 * regulator_enable - enable regulator output 1330 * @regulator: regulator source 1331 * 1332 * Request that the regulator be enabled with the regulator output at 1333 * the predefined voltage or current value. Calls to regulator_enable() 1334 * must be balanced with calls to regulator_disable(). 1335 * 1336 * NOTE: the output value can be set by other drivers, boot loader or may be 1337 * hardwired in the regulator. 1338 */ 1339int regulator_enable(struct regulator *regulator) 1340{ 1341 struct regulator_dev *rdev = regulator->rdev; 1342 int ret = 0; 1343 1344 mutex_lock(&rdev->mutex); 1345 ret = _regulator_enable(rdev); 1346 mutex_unlock(&rdev->mutex); 1347 return ret; 1348} 1349EXPORT_SYMBOL_GPL(regulator_enable); 1350 1351/* locks held by regulator_disable() */ 1352static int _regulator_disable(struct regulator_dev *rdev) 1353{ 1354 int ret = 0; 1355 1356 if (WARN(rdev->use_count <= 0, 1357 "unbalanced disables for %s\n", 1358 rdev_get_name(rdev))) 1359 return -EIO; 1360 1361 /* are we the last user and permitted to disable ? */ 1362 if (rdev->use_count == 1 && 1363 (rdev->constraints && !rdev->constraints->always_on)) { 1364 1365 /* we are last user */ 1366 if (_regulator_can_change_status(rdev) && 1367 rdev->desc->ops->disable) { 1368 ret = rdev->desc->ops->disable(rdev); 1369 if (ret < 0) { 1370 printk(KERN_ERR "%s: failed to disable %s\n", 1371 __func__, rdev_get_name(rdev)); 1372 return ret; 1373 } 1374 1375 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1376 NULL); 1377 } 1378 1379 /* decrease our supplies ref count and disable if required */ 1380 if (rdev->supply) 1381 _regulator_disable(rdev->supply); 1382 1383 rdev->use_count = 0; 1384 } else if (rdev->use_count > 1) { 1385 1386 if (rdev->constraints && 1387 (rdev->constraints->valid_ops_mask & 1388 REGULATOR_CHANGE_DRMS)) 1389 drms_uA_update(rdev); 1390 1391 rdev->use_count--; 1392 } 1393 return ret; 1394} 1395 1396/** 1397 * regulator_disable - disable regulator output 1398 * @regulator: regulator source 1399 * 1400 * Disable the regulator output voltage or current. Calls to 1401 * regulator_enable() must be balanced with calls to 1402 * regulator_disable(). 1403 * 1404 * NOTE: this will only disable the regulator output if no other consumer 1405 * devices have it enabled, the regulator device supports disabling and 1406 * machine constraints permit this operation. 1407 */ 1408int regulator_disable(struct regulator *regulator) 1409{ 1410 struct regulator_dev *rdev = regulator->rdev; 1411 int ret = 0; 1412 1413 mutex_lock(&rdev->mutex); 1414 ret = _regulator_disable(rdev); 1415 mutex_unlock(&rdev->mutex); 1416 return ret; 1417} 1418EXPORT_SYMBOL_GPL(regulator_disable); 1419 1420/* locks held by regulator_force_disable() */ 1421static int _regulator_force_disable(struct regulator_dev *rdev) 1422{ 1423 int ret = 0; 1424 1425 /* force disable */ 1426 if (rdev->desc->ops->disable) { 1427 /* ah well, who wants to live forever... */ 1428 ret = rdev->desc->ops->disable(rdev); 1429 if (ret < 0) { 1430 printk(KERN_ERR "%s: failed to force disable %s\n", 1431 __func__, rdev_get_name(rdev)); 1432 return ret; 1433 } 1434 /* notify other consumers that power has been forced off */ 1435 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1436 REGULATOR_EVENT_DISABLE, NULL); 1437 } 1438 1439 /* decrease our supplies ref count and disable if required */ 1440 if (rdev->supply) 1441 _regulator_disable(rdev->supply); 1442 1443 rdev->use_count = 0; 1444 return ret; 1445} 1446 1447/** 1448 * regulator_force_disable - force disable regulator output 1449 * @regulator: regulator source 1450 * 1451 * Forcibly disable the regulator output voltage or current. 1452 * NOTE: this *will* disable the regulator output even if other consumer 1453 * devices have it enabled. This should be used for situations when device 1454 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1455 */ 1456int regulator_force_disable(struct regulator *regulator) 1457{ 1458 int ret; 1459 1460 mutex_lock(®ulator->rdev->mutex); 1461 regulator->uA_load = 0; 1462 ret = _regulator_force_disable(regulator->rdev); 1463 mutex_unlock(®ulator->rdev->mutex); 1464 return ret; 1465} 1466EXPORT_SYMBOL_GPL(regulator_force_disable); 1467 1468static int _regulator_is_enabled(struct regulator_dev *rdev) 1469{ 1470 /* If we don't know then assume that the regulator is always on */ 1471 if (!rdev->desc->ops->is_enabled) 1472 return 1; 1473 1474 return rdev->desc->ops->is_enabled(rdev); 1475} 1476 1477/** 1478 * regulator_is_enabled - is the regulator output enabled 1479 * @regulator: regulator source 1480 * 1481 * Returns positive if the regulator driver backing the source/client 1482 * has requested that the device be enabled, zero if it hasn't, else a 1483 * negative errno code. 1484 * 1485 * Note that the device backing this regulator handle can have multiple 1486 * users, so it might be enabled even if regulator_enable() was never 1487 * called for this particular source. 1488 */ 1489int regulator_is_enabled(struct regulator *regulator) 1490{ 1491 int ret; 1492 1493 mutex_lock(®ulator->rdev->mutex); 1494 ret = _regulator_is_enabled(regulator->rdev); 1495 mutex_unlock(®ulator->rdev->mutex); 1496 1497 return ret; 1498} 1499EXPORT_SYMBOL_GPL(regulator_is_enabled); 1500 1501/** 1502 * regulator_count_voltages - count regulator_list_voltage() selectors 1503 * @regulator: regulator source 1504 * 1505 * Returns number of selectors, or negative errno. Selectors are 1506 * numbered starting at zero, and typically correspond to bitfields 1507 * in hardware registers. 1508 */ 1509int regulator_count_voltages(struct regulator *regulator) 1510{ 1511 struct regulator_dev *rdev = regulator->rdev; 1512 1513 return rdev->desc->n_voltages ? : -EINVAL; 1514} 1515EXPORT_SYMBOL_GPL(regulator_count_voltages); 1516 1517/** 1518 * regulator_list_voltage - enumerate supported voltages 1519 * @regulator: regulator source 1520 * @selector: identify voltage to list 1521 * Context: can sleep 1522 * 1523 * Returns a voltage that can be passed to @regulator_set_voltage(), 1524 * zero if this selector code can't be used on this system, or a 1525 * negative errno. 1526 */ 1527int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1528{ 1529 struct regulator_dev *rdev = regulator->rdev; 1530 struct regulator_ops *ops = rdev->desc->ops; 1531 int ret; 1532 1533 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1534 return -EINVAL; 1535 1536 mutex_lock(&rdev->mutex); 1537 ret = ops->list_voltage(rdev, selector); 1538 mutex_unlock(&rdev->mutex); 1539 1540 if (ret > 0) { 1541 if (ret < rdev->constraints->min_uV) 1542 ret = 0; 1543 else if (ret > rdev->constraints->max_uV) 1544 ret = 0; 1545 } 1546 1547 return ret; 1548} 1549EXPORT_SYMBOL_GPL(regulator_list_voltage); 1550 1551/** 1552 * regulator_is_supported_voltage - check if a voltage range can be supported 1553 * 1554 * @regulator: Regulator to check. 1555 * @min_uV: Minimum required voltage in uV. 1556 * @max_uV: Maximum required voltage in uV. 1557 * 1558 * Returns a boolean or a negative error code. 1559 */ 1560int regulator_is_supported_voltage(struct regulator *regulator, 1561 int min_uV, int max_uV) 1562{ 1563 int i, voltages, ret; 1564 1565 ret = regulator_count_voltages(regulator); 1566 if (ret < 0) 1567 return ret; 1568 voltages = ret; 1569 1570 for (i = 0; i < voltages; i++) { 1571 ret = regulator_list_voltage(regulator, i); 1572 1573 if (ret >= min_uV && ret <= max_uV) 1574 return 1; 1575 } 1576 1577 return 0; 1578} 1579 1580/** 1581 * regulator_set_voltage - set regulator output voltage 1582 * @regulator: regulator source 1583 * @min_uV: Minimum required voltage in uV 1584 * @max_uV: Maximum acceptable voltage in uV 1585 * 1586 * Sets a voltage regulator to the desired output voltage. This can be set 1587 * during any regulator state. IOW, regulator can be disabled or enabled. 1588 * 1589 * If the regulator is enabled then the voltage will change to the new value 1590 * immediately otherwise if the regulator is disabled the regulator will 1591 * output at the new voltage when enabled. 1592 * 1593 * NOTE: If the regulator is shared between several devices then the lowest 1594 * request voltage that meets the system constraints will be used. 1595 * Regulator system constraints must be set for this regulator before 1596 * calling this function otherwise this call will fail. 1597 */ 1598int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1599{ 1600 struct regulator_dev *rdev = regulator->rdev; 1601 int ret; 1602 1603 mutex_lock(&rdev->mutex); 1604 1605 /* sanity check */ 1606 if (!rdev->desc->ops->set_voltage) { 1607 ret = -EINVAL; 1608 goto out; 1609 } 1610 1611 /* constraints check */ 1612 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1613 if (ret < 0) 1614 goto out; 1615 regulator->min_uV = min_uV; 1616 regulator->max_uV = max_uV; 1617 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1618 1619out: 1620 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1621 mutex_unlock(&rdev->mutex); 1622 return ret; 1623} 1624EXPORT_SYMBOL_GPL(regulator_set_voltage); 1625 1626static int _regulator_get_voltage(struct regulator_dev *rdev) 1627{ 1628 /* sanity check */ 1629 if (rdev->desc->ops->get_voltage) 1630 return rdev->desc->ops->get_voltage(rdev); 1631 else 1632 return -EINVAL; 1633} 1634 1635/** 1636 * regulator_get_voltage - get regulator output voltage 1637 * @regulator: regulator source 1638 * 1639 * This returns the current regulator voltage in uV. 1640 * 1641 * NOTE: If the regulator is disabled it will return the voltage value. This 1642 * function should not be used to determine regulator state. 1643 */ 1644int regulator_get_voltage(struct regulator *regulator) 1645{ 1646 int ret; 1647 1648 mutex_lock(®ulator->rdev->mutex); 1649 1650 ret = _regulator_get_voltage(regulator->rdev); 1651 1652 mutex_unlock(®ulator->rdev->mutex); 1653 1654 return ret; 1655} 1656EXPORT_SYMBOL_GPL(regulator_get_voltage); 1657 1658/** 1659 * regulator_set_current_limit - set regulator output current limit 1660 * @regulator: regulator source 1661 * @min_uA: Minimuum supported current in uA 1662 * @max_uA: Maximum supported current in uA 1663 * 1664 * Sets current sink to the desired output current. This can be set during 1665 * any regulator state. IOW, regulator can be disabled or enabled. 1666 * 1667 * If the regulator is enabled then the current will change to the new value 1668 * immediately otherwise if the regulator is disabled the regulator will 1669 * output at the new current when enabled. 1670 * 1671 * NOTE: Regulator system constraints must be set for this regulator before 1672 * calling this function otherwise this call will fail. 1673 */ 1674int regulator_set_current_limit(struct regulator *regulator, 1675 int min_uA, int max_uA) 1676{ 1677 struct regulator_dev *rdev = regulator->rdev; 1678 int ret; 1679 1680 mutex_lock(&rdev->mutex); 1681 1682 /* sanity check */ 1683 if (!rdev->desc->ops->set_current_limit) { 1684 ret = -EINVAL; 1685 goto out; 1686 } 1687 1688 /* constraints check */ 1689 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1690 if (ret < 0) 1691 goto out; 1692 1693 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1694out: 1695 mutex_unlock(&rdev->mutex); 1696 return ret; 1697} 1698EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1699 1700static int _regulator_get_current_limit(struct regulator_dev *rdev) 1701{ 1702 int ret; 1703 1704 mutex_lock(&rdev->mutex); 1705 1706 /* sanity check */ 1707 if (!rdev->desc->ops->get_current_limit) { 1708 ret = -EINVAL; 1709 goto out; 1710 } 1711 1712 ret = rdev->desc->ops->get_current_limit(rdev); 1713out: 1714 mutex_unlock(&rdev->mutex); 1715 return ret; 1716} 1717 1718/** 1719 * regulator_get_current_limit - get regulator output current 1720 * @regulator: regulator source 1721 * 1722 * This returns the current supplied by the specified current sink in uA. 1723 * 1724 * NOTE: If the regulator is disabled it will return the current value. This 1725 * function should not be used to determine regulator state. 1726 */ 1727int regulator_get_current_limit(struct regulator *regulator) 1728{ 1729 return _regulator_get_current_limit(regulator->rdev); 1730} 1731EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1732 1733/** 1734 * regulator_set_mode - set regulator operating mode 1735 * @regulator: regulator source 1736 * @mode: operating mode - one of the REGULATOR_MODE constants 1737 * 1738 * Set regulator operating mode to increase regulator efficiency or improve 1739 * regulation performance. 1740 * 1741 * NOTE: Regulator system constraints must be set for this regulator before 1742 * calling this function otherwise this call will fail. 1743 */ 1744int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1745{ 1746 struct regulator_dev *rdev = regulator->rdev; 1747 int ret; 1748 int regulator_curr_mode; 1749 1750 mutex_lock(&rdev->mutex); 1751 1752 /* sanity check */ 1753 if (!rdev->desc->ops->set_mode) { 1754 ret = -EINVAL; 1755 goto out; 1756 } 1757 1758 /* return if the same mode is requested */ 1759 if (rdev->desc->ops->get_mode) { 1760 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1761 if (regulator_curr_mode == mode) { 1762 ret = 0; 1763 goto out; 1764 } 1765 } 1766 1767 /* constraints check */ 1768 ret = regulator_check_mode(rdev, mode); 1769 if (ret < 0) 1770 goto out; 1771 1772 ret = rdev->desc->ops->set_mode(rdev, mode); 1773out: 1774 mutex_unlock(&rdev->mutex); 1775 return ret; 1776} 1777EXPORT_SYMBOL_GPL(regulator_set_mode); 1778 1779static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1780{ 1781 int ret; 1782 1783 mutex_lock(&rdev->mutex); 1784 1785 /* sanity check */ 1786 if (!rdev->desc->ops->get_mode) { 1787 ret = -EINVAL; 1788 goto out; 1789 } 1790 1791 ret = rdev->desc->ops->get_mode(rdev); 1792out: 1793 mutex_unlock(&rdev->mutex); 1794 return ret; 1795} 1796 1797/** 1798 * regulator_get_mode - get regulator operating mode 1799 * @regulator: regulator source 1800 * 1801 * Get the current regulator operating mode. 1802 */ 1803unsigned int regulator_get_mode(struct regulator *regulator) 1804{ 1805 return _regulator_get_mode(regulator->rdev); 1806} 1807EXPORT_SYMBOL_GPL(regulator_get_mode); 1808 1809/** 1810 * regulator_set_optimum_mode - set regulator optimum operating mode 1811 * @regulator: regulator source 1812 * @uA_load: load current 1813 * 1814 * Notifies the regulator core of a new device load. This is then used by 1815 * DRMS (if enabled by constraints) to set the most efficient regulator 1816 * operating mode for the new regulator loading. 1817 * 1818 * Consumer devices notify their supply regulator of the maximum power 1819 * they will require (can be taken from device datasheet in the power 1820 * consumption tables) when they change operational status and hence power 1821 * state. Examples of operational state changes that can affect power 1822 * consumption are :- 1823 * 1824 * o Device is opened / closed. 1825 * o Device I/O is about to begin or has just finished. 1826 * o Device is idling in between work. 1827 * 1828 * This information is also exported via sysfs to userspace. 1829 * 1830 * DRMS will sum the total requested load on the regulator and change 1831 * to the most efficient operating mode if platform constraints allow. 1832 * 1833 * Returns the new regulator mode or error. 1834 */ 1835int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1836{ 1837 struct regulator_dev *rdev = regulator->rdev; 1838 struct regulator *consumer; 1839 int ret, output_uV, input_uV, total_uA_load = 0; 1840 unsigned int mode; 1841 1842 mutex_lock(&rdev->mutex); 1843 1844 regulator->uA_load = uA_load; 1845 ret = regulator_check_drms(rdev); 1846 if (ret < 0) 1847 goto out; 1848 ret = -EINVAL; 1849 1850 /* sanity check */ 1851 if (!rdev->desc->ops->get_optimum_mode) 1852 goto out; 1853 1854 /* get output voltage */ 1855 output_uV = rdev->desc->ops->get_voltage(rdev); 1856 if (output_uV <= 0) { 1857 printk(KERN_ERR "%s: invalid output voltage found for %s\n", 1858 __func__, rdev_get_name(rdev)); 1859 goto out; 1860 } 1861 1862 /* get input voltage */ 1863 if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1864 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1865 else 1866 input_uV = rdev->constraints->input_uV; 1867 if (input_uV <= 0) { 1868 printk(KERN_ERR "%s: invalid input voltage found for %s\n", 1869 __func__, rdev_get_name(rdev)); 1870 goto out; 1871 } 1872 1873 /* calc total requested load for this regulator */ 1874 list_for_each_entry(consumer, &rdev->consumer_list, list) 1875 total_uA_load += consumer->uA_load; 1876 1877 mode = rdev->desc->ops->get_optimum_mode(rdev, 1878 input_uV, output_uV, 1879 total_uA_load); 1880 ret = regulator_check_mode(rdev, mode); 1881 if (ret < 0) { 1882 printk(KERN_ERR "%s: failed to get optimum mode for %s @" 1883 " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1884 total_uA_load, input_uV, output_uV); 1885 goto out; 1886 } 1887 1888 ret = rdev->desc->ops->set_mode(rdev, mode); 1889 if (ret < 0) { 1890 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 1891 __func__, mode, rdev_get_name(rdev)); 1892 goto out; 1893 } 1894 ret = mode; 1895out: 1896 mutex_unlock(&rdev->mutex); 1897 return ret; 1898} 1899EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1900 1901/** 1902 * regulator_register_notifier - register regulator event notifier 1903 * @regulator: regulator source 1904 * @nb: notifier block 1905 * 1906 * Register notifier block to receive regulator events. 1907 */ 1908int regulator_register_notifier(struct regulator *regulator, 1909 struct notifier_block *nb) 1910{ 1911 return blocking_notifier_chain_register(®ulator->rdev->notifier, 1912 nb); 1913} 1914EXPORT_SYMBOL_GPL(regulator_register_notifier); 1915 1916/** 1917 * regulator_unregister_notifier - unregister regulator event notifier 1918 * @regulator: regulator source 1919 * @nb: notifier block 1920 * 1921 * Unregister regulator event notifier block. 1922 */ 1923int regulator_unregister_notifier(struct regulator *regulator, 1924 struct notifier_block *nb) 1925{ 1926 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1927 nb); 1928} 1929EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1930 1931/* notify regulator consumers and downstream regulator consumers. 1932 * Note mutex must be held by caller. 1933 */ 1934static void _notifier_call_chain(struct regulator_dev *rdev, 1935 unsigned long event, void *data) 1936{ 1937 struct regulator_dev *_rdev; 1938 1939 /* call rdev chain first */ 1940 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1941 1942 /* now notify regulator we supply */ 1943 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1944 mutex_lock(&_rdev->mutex); 1945 _notifier_call_chain(_rdev, event, data); 1946 mutex_unlock(&_rdev->mutex); 1947 } 1948} 1949 1950/** 1951 * regulator_bulk_get - get multiple regulator consumers 1952 * 1953 * @dev: Device to supply 1954 * @num_consumers: Number of consumers to register 1955 * @consumers: Configuration of consumers; clients are stored here. 1956 * 1957 * @return 0 on success, an errno on failure. 1958 * 1959 * This helper function allows drivers to get several regulator 1960 * consumers in one operation. If any of the regulators cannot be 1961 * acquired then any regulators that were allocated will be freed 1962 * before returning to the caller. 1963 */ 1964int regulator_bulk_get(struct device *dev, int num_consumers, 1965 struct regulator_bulk_data *consumers) 1966{ 1967 int i; 1968 int ret; 1969 1970 for (i = 0; i < num_consumers; i++) 1971 consumers[i].consumer = NULL; 1972 1973 for (i = 0; i < num_consumers; i++) { 1974 consumers[i].consumer = regulator_get(dev, 1975 consumers[i].supply); 1976 if (IS_ERR(consumers[i].consumer)) { 1977 ret = PTR_ERR(consumers[i].consumer); 1978 dev_err(dev, "Failed to get supply '%s': %d\n", 1979 consumers[i].supply, ret); 1980 consumers[i].consumer = NULL; 1981 goto err; 1982 } 1983 } 1984 1985 return 0; 1986 1987err: 1988 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1989 regulator_put(consumers[i].consumer); 1990 1991 return ret; 1992} 1993EXPORT_SYMBOL_GPL(regulator_bulk_get); 1994 1995/** 1996 * regulator_bulk_enable - enable multiple regulator consumers 1997 * 1998 * @num_consumers: Number of consumers 1999 * @consumers: Consumer data; clients are stored here. 2000 * @return 0 on success, an errno on failure 2001 * 2002 * This convenience API allows consumers to enable multiple regulator 2003 * clients in a single API call. If any consumers cannot be enabled 2004 * then any others that were enabled will be disabled again prior to 2005 * return. 2006 */ 2007int regulator_bulk_enable(int num_consumers, 2008 struct regulator_bulk_data *consumers) 2009{ 2010 int i; 2011 int ret; 2012 2013 for (i = 0; i < num_consumers; i++) { 2014 ret = regulator_enable(consumers[i].consumer); 2015 if (ret != 0) 2016 goto err; 2017 } 2018 2019 return 0; 2020 2021err: 2022 printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2023 for (--i; i >= 0; --i) 2024 regulator_disable(consumers[i].consumer); 2025 2026 return ret; 2027} 2028EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2029 2030/** 2031 * regulator_bulk_disable - disable multiple regulator consumers 2032 * 2033 * @num_consumers: Number of consumers 2034 * @consumers: Consumer data; clients are stored here. 2035 * @return 0 on success, an errno on failure 2036 * 2037 * This convenience API allows consumers to disable multiple regulator 2038 * clients in a single API call. If any consumers cannot be enabled 2039 * then any others that were disabled will be disabled again prior to 2040 * return. 2041 */ 2042int regulator_bulk_disable(int num_consumers, 2043 struct regulator_bulk_data *consumers) 2044{ 2045 int i; 2046 int ret; 2047 2048 for (i = 0; i < num_consumers; i++) { 2049 ret = regulator_disable(consumers[i].consumer); 2050 if (ret != 0) 2051 goto err; 2052 } 2053 2054 return 0; 2055 2056err: 2057 printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 2058 ret); 2059 for (--i; i >= 0; --i) 2060 regulator_enable(consumers[i].consumer); 2061 2062 return ret; 2063} 2064EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2065 2066/** 2067 * regulator_bulk_free - free multiple regulator consumers 2068 * 2069 * @num_consumers: Number of consumers 2070 * @consumers: Consumer data; clients are stored here. 2071 * 2072 * This convenience API allows consumers to free multiple regulator 2073 * clients in a single API call. 2074 */ 2075void regulator_bulk_free(int num_consumers, 2076 struct regulator_bulk_data *consumers) 2077{ 2078 int i; 2079 2080 for (i = 0; i < num_consumers; i++) { 2081 regulator_put(consumers[i].consumer); 2082 consumers[i].consumer = NULL; 2083 } 2084} 2085EXPORT_SYMBOL_GPL(regulator_bulk_free); 2086 2087/** 2088 * regulator_notifier_call_chain - call regulator event notifier 2089 * @rdev: regulator source 2090 * @event: notifier block 2091 * @data: callback-specific data. 2092 * 2093 * Called by regulator drivers to notify clients a regulator event has 2094 * occurred. We also notify regulator clients downstream. 2095 * Note lock must be held by caller. 2096 */ 2097int regulator_notifier_call_chain(struct regulator_dev *rdev, 2098 unsigned long event, void *data) 2099{ 2100 _notifier_call_chain(rdev, event, data); 2101 return NOTIFY_DONE; 2102 2103} 2104EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2105 2106/** 2107 * regulator_mode_to_status - convert a regulator mode into a status 2108 * 2109 * @mode: Mode to convert 2110 * 2111 * Convert a regulator mode into a status. 2112 */ 2113int regulator_mode_to_status(unsigned int mode) 2114{ 2115 switch (mode) { 2116 case REGULATOR_MODE_FAST: 2117 return REGULATOR_STATUS_FAST; 2118 case REGULATOR_MODE_NORMAL: 2119 return REGULATOR_STATUS_NORMAL; 2120 case REGULATOR_MODE_IDLE: 2121 return REGULATOR_STATUS_IDLE; 2122 case REGULATOR_STATUS_STANDBY: 2123 return REGULATOR_STATUS_STANDBY; 2124 default: 2125 return 0; 2126 } 2127} 2128EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2129 2130/* 2131 * To avoid cluttering sysfs (and memory) with useless state, only 2132 * create attributes that can be meaningfully displayed. 2133 */ 2134static int add_regulator_attributes(struct regulator_dev *rdev) 2135{ 2136 struct device *dev = &rdev->dev; 2137 struct regulator_ops *ops = rdev->desc->ops; 2138 int status = 0; 2139 2140 /* some attributes need specific methods to be displayed */ 2141 if (ops->get_voltage) { 2142 status = device_create_file(dev, &dev_attr_microvolts); 2143 if (status < 0) 2144 return status; 2145 } 2146 if (ops->get_current_limit) { 2147 status = device_create_file(dev, &dev_attr_microamps); 2148 if (status < 0) 2149 return status; 2150 } 2151 if (ops->get_mode) { 2152 status = device_create_file(dev, &dev_attr_opmode); 2153 if (status < 0) 2154 return status; 2155 } 2156 if (ops->is_enabled) { 2157 status = device_create_file(dev, &dev_attr_state); 2158 if (status < 0) 2159 return status; 2160 } 2161 if (ops->get_status) { 2162 status = device_create_file(dev, &dev_attr_status); 2163 if (status < 0) 2164 return status; 2165 } 2166 2167 /* some attributes are type-specific */ 2168 if (rdev->desc->type == REGULATOR_CURRENT) { 2169 status = device_create_file(dev, &dev_attr_requested_microamps); 2170 if (status < 0) 2171 return status; 2172 } 2173 2174 /* all the other attributes exist to support constraints; 2175 * don't show them if there are no constraints, or if the 2176 * relevant supporting methods are missing. 2177 */ 2178 if (!rdev->constraints) 2179 return status; 2180 2181 /* constraints need specific supporting methods */ 2182 if (ops->set_voltage) { 2183 status = device_create_file(dev, &dev_attr_min_microvolts); 2184 if (status < 0) 2185 return status; 2186 status = device_create_file(dev, &dev_attr_max_microvolts); 2187 if (status < 0) 2188 return status; 2189 } 2190 if (ops->set_current_limit) { 2191 status = device_create_file(dev, &dev_attr_min_microamps); 2192 if (status < 0) 2193 return status; 2194 status = device_create_file(dev, &dev_attr_max_microamps); 2195 if (status < 0) 2196 return status; 2197 } 2198 2199 /* suspend mode constraints need multiple supporting methods */ 2200 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2201 return status; 2202 2203 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2204 if (status < 0) 2205 return status; 2206 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2207 if (status < 0) 2208 return status; 2209 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2210 if (status < 0) 2211 return status; 2212 2213 if (ops->set_suspend_voltage) { 2214 status = device_create_file(dev, 2215 &dev_attr_suspend_standby_microvolts); 2216 if (status < 0) 2217 return status; 2218 status = device_create_file(dev, 2219 &dev_attr_suspend_mem_microvolts); 2220 if (status < 0) 2221 return status; 2222 status = device_create_file(dev, 2223 &dev_attr_suspend_disk_microvolts); 2224 if (status < 0) 2225 return status; 2226 } 2227 2228 if (ops->set_suspend_mode) { 2229 status = device_create_file(dev, 2230 &dev_attr_suspend_standby_mode); 2231 if (status < 0) 2232 return status; 2233 status = device_create_file(dev, 2234 &dev_attr_suspend_mem_mode); 2235 if (status < 0) 2236 return status; 2237 status = device_create_file(dev, 2238 &dev_attr_suspend_disk_mode); 2239 if (status < 0) 2240 return status; 2241 } 2242 2243 return status; 2244} 2245 2246/** 2247 * regulator_register - register regulator 2248 * @regulator_desc: regulator to register 2249 * @dev: struct device for the regulator 2250 * @init_data: platform provided init data, passed through by driver 2251 * @driver_data: private regulator data 2252 * 2253 * Called by regulator drivers to register a regulator. 2254 * Returns 0 on success. 2255 */ 2256struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2257 struct device *dev, struct regulator_init_data *init_data, 2258 void *driver_data) 2259{ 2260 static atomic_t regulator_no = ATOMIC_INIT(0); 2261 struct regulator_dev *rdev; 2262 int ret, i; 2263 2264 if (regulator_desc == NULL) 2265 return ERR_PTR(-EINVAL); 2266 2267 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2268 return ERR_PTR(-EINVAL); 2269 2270 if (regulator_desc->type != REGULATOR_VOLTAGE && 2271 regulator_desc->type != REGULATOR_CURRENT) 2272 return ERR_PTR(-EINVAL); 2273 2274 if (!init_data) 2275 return ERR_PTR(-EINVAL); 2276 2277 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2278 if (rdev == NULL) 2279 return ERR_PTR(-ENOMEM); 2280 2281 mutex_lock(®ulator_list_mutex); 2282 2283 mutex_init(&rdev->mutex); 2284 rdev->reg_data = driver_data; 2285 rdev->owner = regulator_desc->owner; 2286 rdev->desc = regulator_desc; 2287 INIT_LIST_HEAD(&rdev->consumer_list); 2288 INIT_LIST_HEAD(&rdev->supply_list); 2289 INIT_LIST_HEAD(&rdev->list); 2290 INIT_LIST_HEAD(&rdev->slist); 2291 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2292 2293 /* preform any regulator specific init */ 2294 if (init_data->regulator_init) { 2295 ret = init_data->regulator_init(rdev->reg_data); 2296 if (ret < 0) 2297 goto clean; 2298 } 2299 2300 /* register with sysfs */ 2301 rdev->dev.class = ®ulator_class; 2302 rdev->dev.parent = dev; 2303 dev_set_name(&rdev->dev, "regulator.%d", 2304 atomic_inc_return(®ulator_no) - 1); 2305 ret = device_register(&rdev->dev); 2306 if (ret != 0) 2307 goto clean; 2308 2309 dev_set_drvdata(&rdev->dev, rdev); 2310 2311 /* set regulator constraints */ 2312 ret = set_machine_constraints(rdev, &init_data->constraints); 2313 if (ret < 0) 2314 goto scrub; 2315 2316 /* add attributes supported by this regulator */ 2317 ret = add_regulator_attributes(rdev); 2318 if (ret < 0) 2319 goto scrub; 2320 2321 /* set supply regulator if it exists */ 2322 if (init_data->supply_regulator && init_data->supply_regulator_dev) { 2323 dev_err(dev, 2324 "Supply regulator specified by both name and dev\n"); 2325 goto scrub; 2326 } 2327 2328 if (init_data->supply_regulator) { 2329 struct regulator_dev *r; 2330 int found = 0; 2331 2332 list_for_each_entry(r, ®ulator_list, list) { 2333 if (strcmp(rdev_get_name(r), 2334 init_data->supply_regulator) == 0) { 2335 found = 1; 2336 break; 2337 } 2338 } 2339 2340 if (!found) { 2341 dev_err(dev, "Failed to find supply %s\n", 2342 init_data->supply_regulator); 2343 goto scrub; 2344 } 2345 2346 ret = set_supply(rdev, r); 2347 if (ret < 0) 2348 goto scrub; 2349 } 2350 2351 if (init_data->supply_regulator_dev) { 2352 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2353 ret = set_supply(rdev, 2354 dev_get_drvdata(init_data->supply_regulator_dev)); 2355 if (ret < 0) 2356 goto scrub; 2357 } 2358 2359 /* add consumers devices */ 2360 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2361 ret = set_consumer_device_supply(rdev, 2362 init_data->consumer_supplies[i].dev, 2363 init_data->consumer_supplies[i].dev_name, 2364 init_data->consumer_supplies[i].supply); 2365 if (ret < 0) 2366 goto unset_supplies; 2367 } 2368 2369 list_add(&rdev->list, ®ulator_list); 2370out: 2371 mutex_unlock(®ulator_list_mutex); 2372 return rdev; 2373 2374unset_supplies: 2375 unset_regulator_supplies(rdev); 2376 2377scrub: 2378 device_unregister(&rdev->dev); 2379 /* device core frees rdev */ 2380 rdev = ERR_PTR(ret); 2381 goto out; 2382 2383clean: 2384 kfree(rdev); 2385 rdev = ERR_PTR(ret); 2386 goto out; 2387} 2388EXPORT_SYMBOL_GPL(regulator_register); 2389 2390/** 2391 * regulator_unregister - unregister regulator 2392 * @rdev: regulator to unregister 2393 * 2394 * Called by regulator drivers to unregister a regulator. 2395 */ 2396void regulator_unregister(struct regulator_dev *rdev) 2397{ 2398 if (rdev == NULL) 2399 return; 2400 2401 mutex_lock(®ulator_list_mutex); 2402 WARN_ON(rdev->open_count); 2403 unset_regulator_supplies(rdev); 2404 list_del(&rdev->list); 2405 if (rdev->supply) 2406 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2407 device_unregister(&rdev->dev); 2408 mutex_unlock(®ulator_list_mutex); 2409} 2410EXPORT_SYMBOL_GPL(regulator_unregister); 2411 2412/** 2413 * regulator_suspend_prepare - prepare regulators for system wide suspend 2414 * @state: system suspend state 2415 * 2416 * Configure each regulator with it's suspend operating parameters for state. 2417 * This will usually be called by machine suspend code prior to supending. 2418 */ 2419int regulator_suspend_prepare(suspend_state_t state) 2420{ 2421 struct regulator_dev *rdev; 2422 int ret = 0; 2423 2424 /* ON is handled by regulator active state */ 2425 if (state == PM_SUSPEND_ON) 2426 return -EINVAL; 2427 2428 mutex_lock(®ulator_list_mutex); 2429 list_for_each_entry(rdev, ®ulator_list, list) { 2430 2431 mutex_lock(&rdev->mutex); 2432 ret = suspend_prepare(rdev, state); 2433 mutex_unlock(&rdev->mutex); 2434 2435 if (ret < 0) { 2436 printk(KERN_ERR "%s: failed to prepare %s\n", 2437 __func__, rdev_get_name(rdev)); 2438 goto out; 2439 } 2440 } 2441out: 2442 mutex_unlock(®ulator_list_mutex); 2443 return ret; 2444} 2445EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2446 2447/** 2448 * regulator_has_full_constraints - the system has fully specified constraints 2449 * 2450 * Calling this function will cause the regulator API to disable all 2451 * regulators which have a zero use count and don't have an always_on 2452 * constraint in a late_initcall. 2453 * 2454 * The intention is that this will become the default behaviour in a 2455 * future kernel release so users are encouraged to use this facility 2456 * now. 2457 */ 2458void regulator_has_full_constraints(void) 2459{ 2460 has_full_constraints = 1; 2461} 2462EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2463 2464/** 2465 * rdev_get_drvdata - get rdev regulator driver data 2466 * @rdev: regulator 2467 * 2468 * Get rdev regulator driver private data. This call can be used in the 2469 * regulator driver context. 2470 */ 2471void *rdev_get_drvdata(struct regulator_dev *rdev) 2472{ 2473 return rdev->reg_data; 2474} 2475EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2476 2477/** 2478 * regulator_get_drvdata - get regulator driver data 2479 * @regulator: regulator 2480 * 2481 * Get regulator driver private data. This call can be used in the consumer 2482 * driver context when non API regulator specific functions need to be called. 2483 */ 2484void *regulator_get_drvdata(struct regulator *regulator) 2485{ 2486 return regulator->rdev->reg_data; 2487} 2488EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2489 2490/** 2491 * regulator_set_drvdata - set regulator driver data 2492 * @regulator: regulator 2493 * @data: data 2494 */ 2495void regulator_set_drvdata(struct regulator *regulator, void *data) 2496{ 2497 regulator->rdev->reg_data = data; 2498} 2499EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2500 2501/** 2502 * regulator_get_id - get regulator ID 2503 * @rdev: regulator 2504 */ 2505int rdev_get_id(struct regulator_dev *rdev) 2506{ 2507 return rdev->desc->id; 2508} 2509EXPORT_SYMBOL_GPL(rdev_get_id); 2510 2511struct device *rdev_get_dev(struct regulator_dev *rdev) 2512{ 2513 return &rdev->dev; 2514} 2515EXPORT_SYMBOL_GPL(rdev_get_dev); 2516 2517void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2518{ 2519 return reg_init_data->driver_data; 2520} 2521EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2522 2523static int __init regulator_init(void) 2524{ 2525 int ret; 2526 2527 printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 2528 2529 ret = class_register(®ulator_class); 2530 2531 regulator_dummy_init(); 2532 2533 return ret; 2534} 2535 2536/* init early to allow our consumers to complete system booting */ 2537core_initcall(regulator_init); 2538 2539static int __init regulator_init_complete(void) 2540{ 2541 struct regulator_dev *rdev; 2542 struct regulator_ops *ops; 2543 struct regulation_constraints *c; 2544 int enabled, ret; 2545 const char *name; 2546 2547 mutex_lock(®ulator_list_mutex); 2548 2549 /* If we have a full configuration then disable any regulators 2550 * which are not in use or always_on. This will become the 2551 * default behaviour in the future. 2552 */ 2553 list_for_each_entry(rdev, ®ulator_list, list) { 2554 ops = rdev->desc->ops; 2555 c = rdev->constraints; 2556 2557 name = rdev_get_name(rdev); 2558 2559 if (!ops->disable || (c && c->always_on)) 2560 continue; 2561 2562 mutex_lock(&rdev->mutex); 2563 2564 if (rdev->use_count) 2565 goto unlock; 2566 2567 /* If we can't read the status assume it's on. */ 2568 if (ops->is_enabled) 2569 enabled = ops->is_enabled(rdev); 2570 else 2571 enabled = 1; 2572 2573 if (!enabled) 2574 goto unlock; 2575 2576 if (has_full_constraints) { 2577 /* We log since this may kill the system if it 2578 * goes wrong. */ 2579 printk(KERN_INFO "%s: disabling %s\n", 2580 __func__, name); 2581 ret = ops->disable(rdev); 2582 if (ret != 0) { 2583 printk(KERN_ERR 2584 "%s: couldn't disable %s: %d\n", 2585 __func__, name, ret); 2586 } 2587 } else { 2588 /* The intention is that in future we will 2589 * assume that full constraints are provided 2590 * so warn even if we aren't going to do 2591 * anything here. 2592 */ 2593 printk(KERN_WARNING 2594 "%s: incomplete constraints, leaving %s on\n", 2595 __func__, name); 2596 } 2597 2598unlock: 2599 mutex_unlock(&rdev->mutex); 2600 } 2601 2602 mutex_unlock(®ulator_list_mutex); 2603 2604 return 0; 2605} 2606late_initcall(regulator_init_complete); 2607