core.c revision 1130e5b3ff4a7f3f54a48d46e9d0d81b47765bd8
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#define pr_fmt(fmt) "%s: " fmt, __func__ 17 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/debugfs.h> 21#include <linux/device.h> 22#include <linux/slab.h> 23#include <linux/err.h> 24#include <linux/mutex.h> 25#include <linux/suspend.h> 26#include <linux/delay.h> 27#include <linux/regulator/consumer.h> 28#include <linux/regulator/driver.h> 29#include <linux/regulator/machine.h> 30 31#define CREATE_TRACE_POINTS 32#include <trace/events/regulator.h> 33 34#include "dummy.h" 35 36#define rdev_err(rdev, fmt, ...) \ 37 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 38#define rdev_warn(rdev, fmt, ...) \ 39 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 40#define rdev_info(rdev, fmt, ...) \ 41 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_dbg(rdev, fmt, ...) \ 43 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44 45static DEFINE_MUTEX(regulator_list_mutex); 46static LIST_HEAD(regulator_list); 47static LIST_HEAD(regulator_map_list); 48static bool has_full_constraints; 49static bool board_wants_dummy_regulator; 50 51#ifdef CONFIG_DEBUG_FS 52static struct dentry *debugfs_root; 53#endif 54 55/* 56 * struct regulator_map 57 * 58 * Used to provide symbolic supply names to devices. 59 */ 60struct regulator_map { 61 struct list_head list; 62 const char *dev_name; /* The dev_name() for the consumer */ 63 const char *supply; 64 struct regulator_dev *regulator; 65}; 66 67/* 68 * struct regulator 69 * 70 * One for each consumer device. 71 */ 72struct regulator { 73 struct device *dev; 74 struct list_head list; 75 int uA_load; 76 int min_uV; 77 int max_uV; 78 char *supply_name; 79 struct device_attribute dev_attr; 80 struct regulator_dev *rdev; 81}; 82 83static int _regulator_is_enabled(struct regulator_dev *rdev); 84static int _regulator_disable(struct regulator_dev *rdev, 85 struct regulator_dev **supply_rdev_ptr); 86static int _regulator_get_voltage(struct regulator_dev *rdev); 87static int _regulator_get_current_limit(struct regulator_dev *rdev); 88static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 89static void _notifier_call_chain(struct regulator_dev *rdev, 90 unsigned long event, void *data); 91static int _regulator_do_set_voltage(struct regulator_dev *rdev, 92 int min_uV, int max_uV); 93 94static const char *rdev_get_name(struct regulator_dev *rdev) 95{ 96 if (rdev->constraints && rdev->constraints->name) 97 return rdev->constraints->name; 98 else if (rdev->desc->name) 99 return rdev->desc->name; 100 else 101 return ""; 102} 103 104/* gets the regulator for a given consumer device */ 105static struct regulator *get_device_regulator(struct device *dev) 106{ 107 struct regulator *regulator = NULL; 108 struct regulator_dev *rdev; 109 110 mutex_lock(®ulator_list_mutex); 111 list_for_each_entry(rdev, ®ulator_list, list) { 112 mutex_lock(&rdev->mutex); 113 list_for_each_entry(regulator, &rdev->consumer_list, list) { 114 if (regulator->dev == dev) { 115 mutex_unlock(&rdev->mutex); 116 mutex_unlock(®ulator_list_mutex); 117 return regulator; 118 } 119 } 120 mutex_unlock(&rdev->mutex); 121 } 122 mutex_unlock(®ulator_list_mutex); 123 return NULL; 124} 125 126/* Platform voltage constraint check */ 127static int regulator_check_voltage(struct regulator_dev *rdev, 128 int *min_uV, int *max_uV) 129{ 130 BUG_ON(*min_uV > *max_uV); 131 132 if (!rdev->constraints) { 133 rdev_err(rdev, "no constraints\n"); 134 return -ENODEV; 135 } 136 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 137 rdev_err(rdev, "operation not allowed\n"); 138 return -EPERM; 139 } 140 141 if (*max_uV > rdev->constraints->max_uV) 142 *max_uV = rdev->constraints->max_uV; 143 if (*min_uV < rdev->constraints->min_uV) 144 *min_uV = rdev->constraints->min_uV; 145 146 if (*min_uV > *max_uV) 147 return -EINVAL; 148 149 return 0; 150} 151 152/* Make sure we select a voltage that suits the needs of all 153 * regulator consumers 154 */ 155static int regulator_check_consumers(struct regulator_dev *rdev, 156 int *min_uV, int *max_uV) 157{ 158 struct regulator *regulator; 159 160 list_for_each_entry(regulator, &rdev->consumer_list, list) { 161 if (*max_uV > regulator->max_uV) 162 *max_uV = regulator->max_uV; 163 if (*min_uV < regulator->min_uV) 164 *min_uV = regulator->min_uV; 165 } 166 167 if (*min_uV > *max_uV) 168 return -EINVAL; 169 170 return 0; 171} 172 173/* current constraint check */ 174static int regulator_check_current_limit(struct regulator_dev *rdev, 175 int *min_uA, int *max_uA) 176{ 177 BUG_ON(*min_uA > *max_uA); 178 179 if (!rdev->constraints) { 180 rdev_err(rdev, "no constraints\n"); 181 return -ENODEV; 182 } 183 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 184 rdev_err(rdev, "operation not allowed\n"); 185 return -EPERM; 186 } 187 188 if (*max_uA > rdev->constraints->max_uA) 189 *max_uA = rdev->constraints->max_uA; 190 if (*min_uA < rdev->constraints->min_uA) 191 *min_uA = rdev->constraints->min_uA; 192 193 if (*min_uA > *max_uA) 194 return -EINVAL; 195 196 return 0; 197} 198 199/* operating mode constraint check */ 200static int regulator_check_mode(struct regulator_dev *rdev, int mode) 201{ 202 switch (mode) { 203 case REGULATOR_MODE_FAST: 204 case REGULATOR_MODE_NORMAL: 205 case REGULATOR_MODE_IDLE: 206 case REGULATOR_MODE_STANDBY: 207 break; 208 default: 209 return -EINVAL; 210 } 211 212 if (!rdev->constraints) { 213 rdev_err(rdev, "no constraints\n"); 214 return -ENODEV; 215 } 216 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 217 rdev_err(rdev, "operation not allowed\n"); 218 return -EPERM; 219 } 220 if (!(rdev->constraints->valid_modes_mask & mode)) { 221 rdev_err(rdev, "invalid mode %x\n", mode); 222 return -EINVAL; 223 } 224 return 0; 225} 226 227/* dynamic regulator mode switching constraint check */ 228static int regulator_check_drms(struct regulator_dev *rdev) 229{ 230 if (!rdev->constraints) { 231 rdev_err(rdev, "no constraints\n"); 232 return -ENODEV; 233 } 234 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 235 rdev_err(rdev, "operation not allowed\n"); 236 return -EPERM; 237 } 238 return 0; 239} 240 241static ssize_t device_requested_uA_show(struct device *dev, 242 struct device_attribute *attr, char *buf) 243{ 244 struct regulator *regulator; 245 246 regulator = get_device_regulator(dev); 247 if (regulator == NULL) 248 return 0; 249 250 return sprintf(buf, "%d\n", regulator->uA_load); 251} 252 253static ssize_t regulator_uV_show(struct device *dev, 254 struct device_attribute *attr, char *buf) 255{ 256 struct regulator_dev *rdev = dev_get_drvdata(dev); 257 ssize_t ret; 258 259 mutex_lock(&rdev->mutex); 260 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 261 mutex_unlock(&rdev->mutex); 262 263 return ret; 264} 265static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 266 267static ssize_t regulator_uA_show(struct device *dev, 268 struct device_attribute *attr, char *buf) 269{ 270 struct regulator_dev *rdev = dev_get_drvdata(dev); 271 272 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 273} 274static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 275 276static ssize_t regulator_name_show(struct device *dev, 277 struct device_attribute *attr, char *buf) 278{ 279 struct regulator_dev *rdev = dev_get_drvdata(dev); 280 281 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 282} 283 284static ssize_t regulator_print_opmode(char *buf, int mode) 285{ 286 switch (mode) { 287 case REGULATOR_MODE_FAST: 288 return sprintf(buf, "fast\n"); 289 case REGULATOR_MODE_NORMAL: 290 return sprintf(buf, "normal\n"); 291 case REGULATOR_MODE_IDLE: 292 return sprintf(buf, "idle\n"); 293 case REGULATOR_MODE_STANDBY: 294 return sprintf(buf, "standby\n"); 295 } 296 return sprintf(buf, "unknown\n"); 297} 298 299static ssize_t regulator_opmode_show(struct device *dev, 300 struct device_attribute *attr, char *buf) 301{ 302 struct regulator_dev *rdev = dev_get_drvdata(dev); 303 304 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 305} 306static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 307 308static ssize_t regulator_print_state(char *buf, int state) 309{ 310 if (state > 0) 311 return sprintf(buf, "enabled\n"); 312 else if (state == 0) 313 return sprintf(buf, "disabled\n"); 314 else 315 return sprintf(buf, "unknown\n"); 316} 317 318static ssize_t regulator_state_show(struct device *dev, 319 struct device_attribute *attr, char *buf) 320{ 321 struct regulator_dev *rdev = dev_get_drvdata(dev); 322 ssize_t ret; 323 324 mutex_lock(&rdev->mutex); 325 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 326 mutex_unlock(&rdev->mutex); 327 328 return ret; 329} 330static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 331 332static ssize_t regulator_status_show(struct device *dev, 333 struct device_attribute *attr, char *buf) 334{ 335 struct regulator_dev *rdev = dev_get_drvdata(dev); 336 int status; 337 char *label; 338 339 status = rdev->desc->ops->get_status(rdev); 340 if (status < 0) 341 return status; 342 343 switch (status) { 344 case REGULATOR_STATUS_OFF: 345 label = "off"; 346 break; 347 case REGULATOR_STATUS_ON: 348 label = "on"; 349 break; 350 case REGULATOR_STATUS_ERROR: 351 label = "error"; 352 break; 353 case REGULATOR_STATUS_FAST: 354 label = "fast"; 355 break; 356 case REGULATOR_STATUS_NORMAL: 357 label = "normal"; 358 break; 359 case REGULATOR_STATUS_IDLE: 360 label = "idle"; 361 break; 362 case REGULATOR_STATUS_STANDBY: 363 label = "standby"; 364 break; 365 default: 366 return -ERANGE; 367 } 368 369 return sprintf(buf, "%s\n", label); 370} 371static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 372 373static ssize_t regulator_min_uA_show(struct device *dev, 374 struct device_attribute *attr, char *buf) 375{ 376 struct regulator_dev *rdev = dev_get_drvdata(dev); 377 378 if (!rdev->constraints) 379 return sprintf(buf, "constraint not defined\n"); 380 381 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 382} 383static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 384 385static ssize_t regulator_max_uA_show(struct device *dev, 386 struct device_attribute *attr, char *buf) 387{ 388 struct regulator_dev *rdev = dev_get_drvdata(dev); 389 390 if (!rdev->constraints) 391 return sprintf(buf, "constraint not defined\n"); 392 393 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 394} 395static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 396 397static ssize_t regulator_min_uV_show(struct device *dev, 398 struct device_attribute *attr, char *buf) 399{ 400 struct regulator_dev *rdev = dev_get_drvdata(dev); 401 402 if (!rdev->constraints) 403 return sprintf(buf, "constraint not defined\n"); 404 405 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 406} 407static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 408 409static ssize_t regulator_max_uV_show(struct device *dev, 410 struct device_attribute *attr, char *buf) 411{ 412 struct regulator_dev *rdev = dev_get_drvdata(dev); 413 414 if (!rdev->constraints) 415 return sprintf(buf, "constraint not defined\n"); 416 417 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 418} 419static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 420 421static ssize_t regulator_total_uA_show(struct device *dev, 422 struct device_attribute *attr, char *buf) 423{ 424 struct regulator_dev *rdev = dev_get_drvdata(dev); 425 struct regulator *regulator; 426 int uA = 0; 427 428 mutex_lock(&rdev->mutex); 429 list_for_each_entry(regulator, &rdev->consumer_list, list) 430 uA += regulator->uA_load; 431 mutex_unlock(&rdev->mutex); 432 return sprintf(buf, "%d\n", uA); 433} 434static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 435 436static ssize_t regulator_num_users_show(struct device *dev, 437 struct device_attribute *attr, char *buf) 438{ 439 struct regulator_dev *rdev = dev_get_drvdata(dev); 440 return sprintf(buf, "%d\n", rdev->use_count); 441} 442 443static ssize_t regulator_type_show(struct device *dev, 444 struct device_attribute *attr, char *buf) 445{ 446 struct regulator_dev *rdev = dev_get_drvdata(dev); 447 448 switch (rdev->desc->type) { 449 case REGULATOR_VOLTAGE: 450 return sprintf(buf, "voltage\n"); 451 case REGULATOR_CURRENT: 452 return sprintf(buf, "current\n"); 453 } 454 return sprintf(buf, "unknown\n"); 455} 456 457static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 458 struct device_attribute *attr, char *buf) 459{ 460 struct regulator_dev *rdev = dev_get_drvdata(dev); 461 462 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 463} 464static DEVICE_ATTR(suspend_mem_microvolts, 0444, 465 regulator_suspend_mem_uV_show, NULL); 466 467static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 472 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 473} 474static DEVICE_ATTR(suspend_disk_microvolts, 0444, 475 regulator_suspend_disk_uV_show, NULL); 476 477static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 478 struct device_attribute *attr, char *buf) 479{ 480 struct regulator_dev *rdev = dev_get_drvdata(dev); 481 482 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 483} 484static DEVICE_ATTR(suspend_standby_microvolts, 0444, 485 regulator_suspend_standby_uV_show, NULL); 486 487static ssize_t regulator_suspend_mem_mode_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_opmode(buf, 493 rdev->constraints->state_mem.mode); 494} 495static DEVICE_ATTR(suspend_mem_mode, 0444, 496 regulator_suspend_mem_mode_show, NULL); 497 498static ssize_t regulator_suspend_disk_mode_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_opmode(buf, 504 rdev->constraints->state_disk.mode); 505} 506static DEVICE_ATTR(suspend_disk_mode, 0444, 507 regulator_suspend_disk_mode_show, NULL); 508 509static ssize_t regulator_suspend_standby_mode_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_opmode(buf, 515 rdev->constraints->state_standby.mode); 516} 517static DEVICE_ATTR(suspend_standby_mode, 0444, 518 regulator_suspend_standby_mode_show, NULL); 519 520static ssize_t regulator_suspend_mem_state_show(struct device *dev, 521 struct device_attribute *attr, char *buf) 522{ 523 struct regulator_dev *rdev = dev_get_drvdata(dev); 524 525 return regulator_print_state(buf, 526 rdev->constraints->state_mem.enabled); 527} 528static DEVICE_ATTR(suspend_mem_state, 0444, 529 regulator_suspend_mem_state_show, NULL); 530 531static ssize_t regulator_suspend_disk_state_show(struct device *dev, 532 struct device_attribute *attr, char *buf) 533{ 534 struct regulator_dev *rdev = dev_get_drvdata(dev); 535 536 return regulator_print_state(buf, 537 rdev->constraints->state_disk.enabled); 538} 539static DEVICE_ATTR(suspend_disk_state, 0444, 540 regulator_suspend_disk_state_show, NULL); 541 542static ssize_t regulator_suspend_standby_state_show(struct device *dev, 543 struct device_attribute *attr, char *buf) 544{ 545 struct regulator_dev *rdev = dev_get_drvdata(dev); 546 547 return regulator_print_state(buf, 548 rdev->constraints->state_standby.enabled); 549} 550static DEVICE_ATTR(suspend_standby_state, 0444, 551 regulator_suspend_standby_state_show, NULL); 552 553 554/* 555 * These are the only attributes are present for all regulators. 556 * Other attributes are a function of regulator functionality. 557 */ 558static struct device_attribute regulator_dev_attrs[] = { 559 __ATTR(name, 0444, regulator_name_show, NULL), 560 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 561 __ATTR(type, 0444, regulator_type_show, NULL), 562 __ATTR_NULL, 563}; 564 565static void regulator_dev_release(struct device *dev) 566{ 567 struct regulator_dev *rdev = dev_get_drvdata(dev); 568 kfree(rdev); 569} 570 571static struct class regulator_class = { 572 .name = "regulator", 573 .dev_release = regulator_dev_release, 574 .dev_attrs = regulator_dev_attrs, 575}; 576 577/* Calculate the new optimum regulator operating mode based on the new total 578 * consumer load. All locks held by caller */ 579static void drms_uA_update(struct regulator_dev *rdev) 580{ 581 struct regulator *sibling; 582 int current_uA = 0, output_uV, input_uV, err; 583 unsigned int mode; 584 585 err = regulator_check_drms(rdev); 586 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 587 (!rdev->desc->ops->get_voltage && 588 !rdev->desc->ops->get_voltage_sel) || 589 !rdev->desc->ops->set_mode) 590 return; 591 592 /* get output voltage */ 593 output_uV = _regulator_get_voltage(rdev); 594 if (output_uV <= 0) 595 return; 596 597 /* get input voltage */ 598 input_uV = 0; 599 if (rdev->supply) 600 input_uV = _regulator_get_voltage(rdev); 601 if (input_uV <= 0) 602 input_uV = rdev->constraints->input_uV; 603 if (input_uV <= 0) 604 return; 605 606 /* calc total requested load */ 607 list_for_each_entry(sibling, &rdev->consumer_list, list) 608 current_uA += sibling->uA_load; 609 610 /* now get the optimum mode for our new total regulator load */ 611 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 612 output_uV, current_uA); 613 614 /* check the new mode is allowed */ 615 err = regulator_check_mode(rdev, mode); 616 if (err == 0) 617 rdev->desc->ops->set_mode(rdev, mode); 618} 619 620static int suspend_set_state(struct regulator_dev *rdev, 621 struct regulator_state *rstate) 622{ 623 int ret = 0; 624 bool can_set_state; 625 626 can_set_state = rdev->desc->ops->set_suspend_enable && 627 rdev->desc->ops->set_suspend_disable; 628 629 /* If we have no suspend mode configration don't set anything; 630 * only warn if the driver actually makes the suspend mode 631 * configurable. 632 */ 633 if (!rstate->enabled && !rstate->disabled) { 634 if (can_set_state) 635 rdev_warn(rdev, "No configuration\n"); 636 return 0; 637 } 638 639 if (rstate->enabled && rstate->disabled) { 640 rdev_err(rdev, "invalid configuration\n"); 641 return -EINVAL; 642 } 643 644 if (!can_set_state) { 645 rdev_err(rdev, "no way to set suspend state\n"); 646 return -EINVAL; 647 } 648 649 if (rstate->enabled) 650 ret = rdev->desc->ops->set_suspend_enable(rdev); 651 else 652 ret = rdev->desc->ops->set_suspend_disable(rdev); 653 if (ret < 0) { 654 rdev_err(rdev, "failed to enabled/disable\n"); 655 return ret; 656 } 657 658 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 659 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 660 if (ret < 0) { 661 rdev_err(rdev, "failed to set voltage\n"); 662 return ret; 663 } 664 } 665 666 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 667 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 668 if (ret < 0) { 669 rdev_err(rdev, "failed to set mode\n"); 670 return ret; 671 } 672 } 673 return ret; 674} 675 676/* locks held by caller */ 677static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 678{ 679 if (!rdev->constraints) 680 return -EINVAL; 681 682 switch (state) { 683 case PM_SUSPEND_STANDBY: 684 return suspend_set_state(rdev, 685 &rdev->constraints->state_standby); 686 case PM_SUSPEND_MEM: 687 return suspend_set_state(rdev, 688 &rdev->constraints->state_mem); 689 case PM_SUSPEND_MAX: 690 return suspend_set_state(rdev, 691 &rdev->constraints->state_disk); 692 default: 693 return -EINVAL; 694 } 695} 696 697static void print_constraints(struct regulator_dev *rdev) 698{ 699 struct regulation_constraints *constraints = rdev->constraints; 700 char buf[80] = ""; 701 int count = 0; 702 int ret; 703 704 if (constraints->min_uV && constraints->max_uV) { 705 if (constraints->min_uV == constraints->max_uV) 706 count += sprintf(buf + count, "%d mV ", 707 constraints->min_uV / 1000); 708 else 709 count += sprintf(buf + count, "%d <--> %d mV ", 710 constraints->min_uV / 1000, 711 constraints->max_uV / 1000); 712 } 713 714 if (!constraints->min_uV || 715 constraints->min_uV != constraints->max_uV) { 716 ret = _regulator_get_voltage(rdev); 717 if (ret > 0) 718 count += sprintf(buf + count, "at %d mV ", ret / 1000); 719 } 720 721 if (constraints->min_uA && constraints->max_uA) { 722 if (constraints->min_uA == constraints->max_uA) 723 count += sprintf(buf + count, "%d mA ", 724 constraints->min_uA / 1000); 725 else 726 count += sprintf(buf + count, "%d <--> %d mA ", 727 constraints->min_uA / 1000, 728 constraints->max_uA / 1000); 729 } 730 731 if (!constraints->min_uA || 732 constraints->min_uA != constraints->max_uA) { 733 ret = _regulator_get_current_limit(rdev); 734 if (ret > 0) 735 count += sprintf(buf + count, "at %d mA ", ret / 1000); 736 } 737 738 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 739 count += sprintf(buf + count, "fast "); 740 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 741 count += sprintf(buf + count, "normal "); 742 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 743 count += sprintf(buf + count, "idle "); 744 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 745 count += sprintf(buf + count, "standby"); 746 747 rdev_info(rdev, "%s\n", buf); 748} 749 750static int machine_constraints_voltage(struct regulator_dev *rdev, 751 struct regulation_constraints *constraints) 752{ 753 struct regulator_ops *ops = rdev->desc->ops; 754 int ret; 755 756 /* do we need to apply the constraint voltage */ 757 if (rdev->constraints->apply_uV && 758 rdev->constraints->min_uV == rdev->constraints->max_uV) { 759 ret = _regulator_do_set_voltage(rdev, 760 rdev->constraints->min_uV, 761 rdev->constraints->max_uV); 762 if (ret < 0) { 763 rdev_err(rdev, "failed to apply %duV constraint\n", 764 rdev->constraints->min_uV); 765 rdev->constraints = NULL; 766 return ret; 767 } 768 } 769 770 /* constrain machine-level voltage specs to fit 771 * the actual range supported by this regulator. 772 */ 773 if (ops->list_voltage && rdev->desc->n_voltages) { 774 int count = rdev->desc->n_voltages; 775 int i; 776 int min_uV = INT_MAX; 777 int max_uV = INT_MIN; 778 int cmin = constraints->min_uV; 779 int cmax = constraints->max_uV; 780 781 /* it's safe to autoconfigure fixed-voltage supplies 782 and the constraints are used by list_voltage. */ 783 if (count == 1 && !cmin) { 784 cmin = 1; 785 cmax = INT_MAX; 786 constraints->min_uV = cmin; 787 constraints->max_uV = cmax; 788 } 789 790 /* voltage constraints are optional */ 791 if ((cmin == 0) && (cmax == 0)) 792 return 0; 793 794 /* else require explicit machine-level constraints */ 795 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 796 rdev_err(rdev, "invalid voltage constraints\n"); 797 return -EINVAL; 798 } 799 800 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 801 for (i = 0; i < count; i++) { 802 int value; 803 804 value = ops->list_voltage(rdev, i); 805 if (value <= 0) 806 continue; 807 808 /* maybe adjust [min_uV..max_uV] */ 809 if (value >= cmin && value < min_uV) 810 min_uV = value; 811 if (value <= cmax && value > max_uV) 812 max_uV = value; 813 } 814 815 /* final: [min_uV..max_uV] valid iff constraints valid */ 816 if (max_uV < min_uV) { 817 rdev_err(rdev, "unsupportable voltage constraints\n"); 818 return -EINVAL; 819 } 820 821 /* use regulator's subset of machine constraints */ 822 if (constraints->min_uV < min_uV) { 823 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 824 constraints->min_uV, min_uV); 825 constraints->min_uV = min_uV; 826 } 827 if (constraints->max_uV > max_uV) { 828 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 829 constraints->max_uV, max_uV); 830 constraints->max_uV = max_uV; 831 } 832 } 833 834 return 0; 835} 836 837/** 838 * set_machine_constraints - sets regulator constraints 839 * @rdev: regulator source 840 * @constraints: constraints to apply 841 * 842 * Allows platform initialisation code to define and constrain 843 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 844 * Constraints *must* be set by platform code in order for some 845 * regulator operations to proceed i.e. set_voltage, set_current_limit, 846 * set_mode. 847 */ 848static int set_machine_constraints(struct regulator_dev *rdev, 849 const struct regulation_constraints *constraints) 850{ 851 int ret = 0; 852 struct regulator_ops *ops = rdev->desc->ops; 853 854 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 855 GFP_KERNEL); 856 if (!rdev->constraints) 857 return -ENOMEM; 858 859 ret = machine_constraints_voltage(rdev, rdev->constraints); 860 if (ret != 0) 861 goto out; 862 863 /* do we need to setup our suspend state */ 864 if (constraints->initial_state) { 865 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 866 if (ret < 0) { 867 rdev_err(rdev, "failed to set suspend state\n"); 868 rdev->constraints = NULL; 869 goto out; 870 } 871 } 872 873 if (constraints->initial_mode) { 874 if (!ops->set_mode) { 875 rdev_err(rdev, "no set_mode operation\n"); 876 ret = -EINVAL; 877 goto out; 878 } 879 880 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 881 if (ret < 0) { 882 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 883 goto out; 884 } 885 } 886 887 /* If the constraints say the regulator should be on at this point 888 * and we have control then make sure it is enabled. 889 */ 890 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 891 ops->enable) { 892 ret = ops->enable(rdev); 893 if (ret < 0) { 894 rdev_err(rdev, "failed to enable\n"); 895 rdev->constraints = NULL; 896 goto out; 897 } 898 } 899 900 print_constraints(rdev); 901out: 902 return ret; 903} 904 905/** 906 * set_supply - set regulator supply regulator 907 * @rdev: regulator name 908 * @supply_rdev: supply regulator name 909 * 910 * Called by platform initialisation code to set the supply regulator for this 911 * regulator. This ensures that a regulators supply will also be enabled by the 912 * core if it's child is enabled. 913 */ 914static int set_supply(struct regulator_dev *rdev, 915 struct regulator_dev *supply_rdev) 916{ 917 int err; 918 919 err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 920 "supply"); 921 if (err) { 922 rdev_err(rdev, "could not add device link %s err %d\n", 923 supply_rdev->dev.kobj.name, err); 924 goto out; 925 } 926 rdev->supply = supply_rdev; 927 list_add(&rdev->slist, &supply_rdev->supply_list); 928out: 929 return err; 930} 931 932/** 933 * set_consumer_device_supply - Bind a regulator to a symbolic supply 934 * @rdev: regulator source 935 * @consumer_dev: device the supply applies to 936 * @consumer_dev_name: dev_name() string for device supply applies to 937 * @supply: symbolic name for supply 938 * 939 * Allows platform initialisation code to map physical regulator 940 * sources to symbolic names for supplies for use by devices. Devices 941 * should use these symbolic names to request regulators, avoiding the 942 * need to provide board-specific regulator names as platform data. 943 * 944 * Only one of consumer_dev and consumer_dev_name may be specified. 945 */ 946static int set_consumer_device_supply(struct regulator_dev *rdev, 947 struct device *consumer_dev, const char *consumer_dev_name, 948 const char *supply) 949{ 950 struct regulator_map *node; 951 int has_dev; 952 953 if (consumer_dev && consumer_dev_name) 954 return -EINVAL; 955 956 if (!consumer_dev_name && consumer_dev) 957 consumer_dev_name = dev_name(consumer_dev); 958 959 if (supply == NULL) 960 return -EINVAL; 961 962 if (consumer_dev_name != NULL) 963 has_dev = 1; 964 else 965 has_dev = 0; 966 967 list_for_each_entry(node, ®ulator_map_list, list) { 968 if (node->dev_name && consumer_dev_name) { 969 if (strcmp(node->dev_name, consumer_dev_name) != 0) 970 continue; 971 } else if (node->dev_name || consumer_dev_name) { 972 continue; 973 } 974 975 if (strcmp(node->supply, supply) != 0) 976 continue; 977 978 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 979 dev_name(&node->regulator->dev), 980 node->regulator->desc->name, 981 supply, 982 dev_name(&rdev->dev), rdev_get_name(rdev)); 983 return -EBUSY; 984 } 985 986 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 987 if (node == NULL) 988 return -ENOMEM; 989 990 node->regulator = rdev; 991 node->supply = supply; 992 993 if (has_dev) { 994 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 995 if (node->dev_name == NULL) { 996 kfree(node); 997 return -ENOMEM; 998 } 999 } 1000 1001 list_add(&node->list, ®ulator_map_list); 1002 return 0; 1003} 1004 1005static void unset_regulator_supplies(struct regulator_dev *rdev) 1006{ 1007 struct regulator_map *node, *n; 1008 1009 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1010 if (rdev == node->regulator) { 1011 list_del(&node->list); 1012 kfree(node->dev_name); 1013 kfree(node); 1014 } 1015 } 1016} 1017 1018#define REG_STR_SIZE 32 1019 1020static struct regulator *create_regulator(struct regulator_dev *rdev, 1021 struct device *dev, 1022 const char *supply_name) 1023{ 1024 struct regulator *regulator; 1025 char buf[REG_STR_SIZE]; 1026 int err, size; 1027 1028 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1029 if (regulator == NULL) 1030 return NULL; 1031 1032 mutex_lock(&rdev->mutex); 1033 regulator->rdev = rdev; 1034 list_add(®ulator->list, &rdev->consumer_list); 1035 1036 if (dev) { 1037 /* create a 'requested_microamps_name' sysfs entry */ 1038 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1039 supply_name); 1040 if (size >= REG_STR_SIZE) 1041 goto overflow_err; 1042 1043 regulator->dev = dev; 1044 sysfs_attr_init(®ulator->dev_attr.attr); 1045 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1046 if (regulator->dev_attr.attr.name == NULL) 1047 goto attr_name_err; 1048 1049 regulator->dev_attr.attr.mode = 0444; 1050 regulator->dev_attr.show = device_requested_uA_show; 1051 err = device_create_file(dev, ®ulator->dev_attr); 1052 if (err < 0) { 1053 rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1054 goto attr_name_err; 1055 } 1056 1057 /* also add a link to the device sysfs entry */ 1058 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1059 dev->kobj.name, supply_name); 1060 if (size >= REG_STR_SIZE) 1061 goto attr_err; 1062 1063 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1064 if (regulator->supply_name == NULL) 1065 goto attr_err; 1066 1067 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1068 buf); 1069 if (err) { 1070 rdev_warn(rdev, "could not add device link %s err %d\n", 1071 dev->kobj.name, err); 1072 goto link_name_err; 1073 } 1074 } 1075 mutex_unlock(&rdev->mutex); 1076 return regulator; 1077link_name_err: 1078 kfree(regulator->supply_name); 1079attr_err: 1080 device_remove_file(regulator->dev, ®ulator->dev_attr); 1081attr_name_err: 1082 kfree(regulator->dev_attr.attr.name); 1083overflow_err: 1084 list_del(®ulator->list); 1085 kfree(regulator); 1086 mutex_unlock(&rdev->mutex); 1087 return NULL; 1088} 1089 1090static int _regulator_get_enable_time(struct regulator_dev *rdev) 1091{ 1092 if (!rdev->desc->ops->enable_time) 1093 return 0; 1094 return rdev->desc->ops->enable_time(rdev); 1095} 1096 1097/* Internal regulator request function */ 1098static struct regulator *_regulator_get(struct device *dev, const char *id, 1099 int exclusive) 1100{ 1101 struct regulator_dev *rdev; 1102 struct regulator_map *map; 1103 struct regulator *regulator = ERR_PTR(-ENODEV); 1104 const char *devname = NULL; 1105 int ret; 1106 1107 if (id == NULL) { 1108 pr_err("get() with no identifier\n"); 1109 return regulator; 1110 } 1111 1112 if (dev) 1113 devname = dev_name(dev); 1114 1115 mutex_lock(®ulator_list_mutex); 1116 1117 list_for_each_entry(map, ®ulator_map_list, list) { 1118 /* If the mapping has a device set up it must match */ 1119 if (map->dev_name && 1120 (!devname || strcmp(map->dev_name, devname))) 1121 continue; 1122 1123 if (strcmp(map->supply, id) == 0) { 1124 rdev = map->regulator; 1125 goto found; 1126 } 1127 } 1128 1129 if (board_wants_dummy_regulator) { 1130 rdev = dummy_regulator_rdev; 1131 goto found; 1132 } 1133 1134#ifdef CONFIG_REGULATOR_DUMMY 1135 if (!devname) 1136 devname = "deviceless"; 1137 1138 /* If the board didn't flag that it was fully constrained then 1139 * substitute in a dummy regulator so consumers can continue. 1140 */ 1141 if (!has_full_constraints) { 1142 pr_warn("%s supply %s not found, using dummy regulator\n", 1143 devname, id); 1144 rdev = dummy_regulator_rdev; 1145 goto found; 1146 } 1147#endif 1148 1149 mutex_unlock(®ulator_list_mutex); 1150 return regulator; 1151 1152found: 1153 if (rdev->exclusive) { 1154 regulator = ERR_PTR(-EPERM); 1155 goto out; 1156 } 1157 1158 if (exclusive && rdev->open_count) { 1159 regulator = ERR_PTR(-EBUSY); 1160 goto out; 1161 } 1162 1163 if (!try_module_get(rdev->owner)) 1164 goto out; 1165 1166 regulator = create_regulator(rdev, dev, id); 1167 if (regulator == NULL) { 1168 regulator = ERR_PTR(-ENOMEM); 1169 module_put(rdev->owner); 1170 } 1171 1172 rdev->open_count++; 1173 if (exclusive) { 1174 rdev->exclusive = 1; 1175 1176 ret = _regulator_is_enabled(rdev); 1177 if (ret > 0) 1178 rdev->use_count = 1; 1179 else 1180 rdev->use_count = 0; 1181 } 1182 1183out: 1184 mutex_unlock(®ulator_list_mutex); 1185 1186 return regulator; 1187} 1188 1189/** 1190 * regulator_get - lookup and obtain a reference to a regulator. 1191 * @dev: device for regulator "consumer" 1192 * @id: Supply name or regulator ID. 1193 * 1194 * Returns a struct regulator corresponding to the regulator producer, 1195 * or IS_ERR() condition containing errno. 1196 * 1197 * Use of supply names configured via regulator_set_device_supply() is 1198 * strongly encouraged. It is recommended that the supply name used 1199 * should match the name used for the supply and/or the relevant 1200 * device pins in the datasheet. 1201 */ 1202struct regulator *regulator_get(struct device *dev, const char *id) 1203{ 1204 return _regulator_get(dev, id, 0); 1205} 1206EXPORT_SYMBOL_GPL(regulator_get); 1207 1208/** 1209 * regulator_get_exclusive - obtain exclusive access to a regulator. 1210 * @dev: device for regulator "consumer" 1211 * @id: Supply name or regulator ID. 1212 * 1213 * Returns a struct regulator corresponding to the regulator producer, 1214 * or IS_ERR() condition containing errno. Other consumers will be 1215 * unable to obtain this reference is held and the use count for the 1216 * regulator will be initialised to reflect the current state of the 1217 * regulator. 1218 * 1219 * This is intended for use by consumers which cannot tolerate shared 1220 * use of the regulator such as those which need to force the 1221 * regulator off for correct operation of the hardware they are 1222 * controlling. 1223 * 1224 * Use of supply names configured via regulator_set_device_supply() is 1225 * strongly encouraged. It is recommended that the supply name used 1226 * should match the name used for the supply and/or the relevant 1227 * device pins in the datasheet. 1228 */ 1229struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1230{ 1231 return _regulator_get(dev, id, 1); 1232} 1233EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1234 1235/** 1236 * regulator_put - "free" the regulator source 1237 * @regulator: regulator source 1238 * 1239 * Note: drivers must ensure that all regulator_enable calls made on this 1240 * regulator source are balanced by regulator_disable calls prior to calling 1241 * this function. 1242 */ 1243void regulator_put(struct regulator *regulator) 1244{ 1245 struct regulator_dev *rdev; 1246 1247 if (regulator == NULL || IS_ERR(regulator)) 1248 return; 1249 1250 mutex_lock(®ulator_list_mutex); 1251 rdev = regulator->rdev; 1252 1253 /* remove any sysfs entries */ 1254 if (regulator->dev) { 1255 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1256 kfree(regulator->supply_name); 1257 device_remove_file(regulator->dev, ®ulator->dev_attr); 1258 kfree(regulator->dev_attr.attr.name); 1259 } 1260 list_del(®ulator->list); 1261 kfree(regulator); 1262 1263 rdev->open_count--; 1264 rdev->exclusive = 0; 1265 1266 module_put(rdev->owner); 1267 mutex_unlock(®ulator_list_mutex); 1268} 1269EXPORT_SYMBOL_GPL(regulator_put); 1270 1271static int _regulator_can_change_status(struct regulator_dev *rdev) 1272{ 1273 if (!rdev->constraints) 1274 return 0; 1275 1276 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 1277 return 1; 1278 else 1279 return 0; 1280} 1281 1282/* locks held by regulator_enable() */ 1283static int _regulator_enable(struct regulator_dev *rdev) 1284{ 1285 int ret, delay; 1286 1287 if (rdev->use_count == 0) { 1288 /* do we need to enable the supply regulator first */ 1289 if (rdev->supply) { 1290 mutex_lock(&rdev->supply->mutex); 1291 ret = _regulator_enable(rdev->supply); 1292 mutex_unlock(&rdev->supply->mutex); 1293 if (ret < 0) { 1294 rdev_err(rdev, "failed to enable: %d\n", ret); 1295 return ret; 1296 } 1297 } 1298 } 1299 1300 /* check voltage and requested load before enabling */ 1301 if (rdev->constraints && 1302 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1303 drms_uA_update(rdev); 1304 1305 if (rdev->use_count == 0) { 1306 /* The regulator may on if it's not switchable or left on */ 1307 ret = _regulator_is_enabled(rdev); 1308 if (ret == -EINVAL || ret == 0) { 1309 if (!_regulator_can_change_status(rdev)) 1310 return -EPERM; 1311 1312 if (!rdev->desc->ops->enable) 1313 return -EINVAL; 1314 1315 /* Query before enabling in case configuration 1316 * dependant. */ 1317 ret = _regulator_get_enable_time(rdev); 1318 if (ret >= 0) { 1319 delay = ret; 1320 } else { 1321 rdev_warn(rdev, "enable_time() failed: %d\n", 1322 ret); 1323 delay = 0; 1324 } 1325 1326 trace_regulator_enable(rdev_get_name(rdev)); 1327 1328 /* Allow the regulator to ramp; it would be useful 1329 * to extend this for bulk operations so that the 1330 * regulators can ramp together. */ 1331 ret = rdev->desc->ops->enable(rdev); 1332 if (ret < 0) 1333 return ret; 1334 1335 trace_regulator_enable_delay(rdev_get_name(rdev)); 1336 1337 if (delay >= 1000) { 1338 mdelay(delay / 1000); 1339 udelay(delay % 1000); 1340 } else if (delay) { 1341 udelay(delay); 1342 } 1343 1344 trace_regulator_enable_complete(rdev_get_name(rdev)); 1345 1346 } else if (ret < 0) { 1347 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1348 return ret; 1349 } 1350 /* Fallthrough on positive return values - already enabled */ 1351 } 1352 1353 rdev->use_count++; 1354 1355 return 0; 1356} 1357 1358/** 1359 * regulator_enable - enable regulator output 1360 * @regulator: regulator source 1361 * 1362 * Request that the regulator be enabled with the regulator output at 1363 * the predefined voltage or current value. Calls to regulator_enable() 1364 * must be balanced with calls to regulator_disable(). 1365 * 1366 * NOTE: the output value can be set by other drivers, boot loader or may be 1367 * hardwired in the regulator. 1368 */ 1369int regulator_enable(struct regulator *regulator) 1370{ 1371 struct regulator_dev *rdev = regulator->rdev; 1372 int ret = 0; 1373 1374 mutex_lock(&rdev->mutex); 1375 ret = _regulator_enable(rdev); 1376 mutex_unlock(&rdev->mutex); 1377 return ret; 1378} 1379EXPORT_SYMBOL_GPL(regulator_enable); 1380 1381/* locks held by regulator_disable() */ 1382static int _regulator_disable(struct regulator_dev *rdev, 1383 struct regulator_dev **supply_rdev_ptr) 1384{ 1385 int ret = 0; 1386 *supply_rdev_ptr = NULL; 1387 1388 if (WARN(rdev->use_count <= 0, 1389 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1390 return -EIO; 1391 1392 /* are we the last user and permitted to disable ? */ 1393 if (rdev->use_count == 1 && 1394 (rdev->constraints && !rdev->constraints->always_on)) { 1395 1396 /* we are last user */ 1397 if (_regulator_can_change_status(rdev) && 1398 rdev->desc->ops->disable) { 1399 trace_regulator_disable(rdev_get_name(rdev)); 1400 1401 ret = rdev->desc->ops->disable(rdev); 1402 if (ret < 0) { 1403 rdev_err(rdev, "failed to disable\n"); 1404 return ret; 1405 } 1406 1407 trace_regulator_disable_complete(rdev_get_name(rdev)); 1408 1409 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1410 NULL); 1411 } 1412 1413 /* decrease our supplies ref count and disable if required */ 1414 *supply_rdev_ptr = rdev->supply; 1415 1416 rdev->use_count = 0; 1417 } else if (rdev->use_count > 1) { 1418 1419 if (rdev->constraints && 1420 (rdev->constraints->valid_ops_mask & 1421 REGULATOR_CHANGE_DRMS)) 1422 drms_uA_update(rdev); 1423 1424 rdev->use_count--; 1425 } 1426 return ret; 1427} 1428 1429/** 1430 * regulator_disable - disable regulator output 1431 * @regulator: regulator source 1432 * 1433 * Disable the regulator output voltage or current. Calls to 1434 * regulator_enable() must be balanced with calls to 1435 * regulator_disable(). 1436 * 1437 * NOTE: this will only disable the regulator output if no other consumer 1438 * devices have it enabled, the regulator device supports disabling and 1439 * machine constraints permit this operation. 1440 */ 1441int regulator_disable(struct regulator *regulator) 1442{ 1443 struct regulator_dev *rdev = regulator->rdev; 1444 struct regulator_dev *supply_rdev = NULL; 1445 int ret = 0; 1446 1447 mutex_lock(&rdev->mutex); 1448 ret = _regulator_disable(rdev, &supply_rdev); 1449 mutex_unlock(&rdev->mutex); 1450 1451 /* decrease our supplies ref count and disable if required */ 1452 while (supply_rdev != NULL) { 1453 rdev = supply_rdev; 1454 1455 mutex_lock(&rdev->mutex); 1456 _regulator_disable(rdev, &supply_rdev); 1457 mutex_unlock(&rdev->mutex); 1458 } 1459 1460 return ret; 1461} 1462EXPORT_SYMBOL_GPL(regulator_disable); 1463 1464/* locks held by regulator_force_disable() */ 1465static int _regulator_force_disable(struct regulator_dev *rdev, 1466 struct regulator_dev **supply_rdev_ptr) 1467{ 1468 int ret = 0; 1469 1470 /* force disable */ 1471 if (rdev->desc->ops->disable) { 1472 /* ah well, who wants to live forever... */ 1473 ret = rdev->desc->ops->disable(rdev); 1474 if (ret < 0) { 1475 rdev_err(rdev, "failed to force disable\n"); 1476 return ret; 1477 } 1478 /* notify other consumers that power has been forced off */ 1479 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1480 REGULATOR_EVENT_DISABLE, NULL); 1481 } 1482 1483 /* decrease our supplies ref count and disable if required */ 1484 *supply_rdev_ptr = rdev->supply; 1485 1486 rdev->use_count = 0; 1487 return ret; 1488} 1489 1490/** 1491 * regulator_force_disable - force disable regulator output 1492 * @regulator: regulator source 1493 * 1494 * Forcibly disable the regulator output voltage or current. 1495 * NOTE: this *will* disable the regulator output even if other consumer 1496 * devices have it enabled. This should be used for situations when device 1497 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1498 */ 1499int regulator_force_disable(struct regulator *regulator) 1500{ 1501 struct regulator_dev *supply_rdev = NULL; 1502 int ret; 1503 1504 mutex_lock(®ulator->rdev->mutex); 1505 regulator->uA_load = 0; 1506 ret = _regulator_force_disable(regulator->rdev, &supply_rdev); 1507 mutex_unlock(®ulator->rdev->mutex); 1508 1509 if (supply_rdev) 1510 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); 1511 1512 return ret; 1513} 1514EXPORT_SYMBOL_GPL(regulator_force_disable); 1515 1516static int _regulator_is_enabled(struct regulator_dev *rdev) 1517{ 1518 /* If we don't know then assume that the regulator is always on */ 1519 if (!rdev->desc->ops->is_enabled) 1520 return 1; 1521 1522 return rdev->desc->ops->is_enabled(rdev); 1523} 1524 1525/** 1526 * regulator_is_enabled - is the regulator output enabled 1527 * @regulator: regulator source 1528 * 1529 * Returns positive if the regulator driver backing the source/client 1530 * has requested that the device be enabled, zero if it hasn't, else a 1531 * negative errno code. 1532 * 1533 * Note that the device backing this regulator handle can have multiple 1534 * users, so it might be enabled even if regulator_enable() was never 1535 * called for this particular source. 1536 */ 1537int regulator_is_enabled(struct regulator *regulator) 1538{ 1539 int ret; 1540 1541 mutex_lock(®ulator->rdev->mutex); 1542 ret = _regulator_is_enabled(regulator->rdev); 1543 mutex_unlock(®ulator->rdev->mutex); 1544 1545 return ret; 1546} 1547EXPORT_SYMBOL_GPL(regulator_is_enabled); 1548 1549/** 1550 * regulator_count_voltages - count regulator_list_voltage() selectors 1551 * @regulator: regulator source 1552 * 1553 * Returns number of selectors, or negative errno. Selectors are 1554 * numbered starting at zero, and typically correspond to bitfields 1555 * in hardware registers. 1556 */ 1557int regulator_count_voltages(struct regulator *regulator) 1558{ 1559 struct regulator_dev *rdev = regulator->rdev; 1560 1561 return rdev->desc->n_voltages ? : -EINVAL; 1562} 1563EXPORT_SYMBOL_GPL(regulator_count_voltages); 1564 1565/** 1566 * regulator_list_voltage - enumerate supported voltages 1567 * @regulator: regulator source 1568 * @selector: identify voltage to list 1569 * Context: can sleep 1570 * 1571 * Returns a voltage that can be passed to @regulator_set_voltage(), 1572 * zero if this selector code can't be used on this system, or a 1573 * negative errno. 1574 */ 1575int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1576{ 1577 struct regulator_dev *rdev = regulator->rdev; 1578 struct regulator_ops *ops = rdev->desc->ops; 1579 int ret; 1580 1581 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1582 return -EINVAL; 1583 1584 mutex_lock(&rdev->mutex); 1585 ret = ops->list_voltage(rdev, selector); 1586 mutex_unlock(&rdev->mutex); 1587 1588 if (ret > 0) { 1589 if (ret < rdev->constraints->min_uV) 1590 ret = 0; 1591 else if (ret > rdev->constraints->max_uV) 1592 ret = 0; 1593 } 1594 1595 return ret; 1596} 1597EXPORT_SYMBOL_GPL(regulator_list_voltage); 1598 1599/** 1600 * regulator_is_supported_voltage - check if a voltage range can be supported 1601 * 1602 * @regulator: Regulator to check. 1603 * @min_uV: Minimum required voltage in uV. 1604 * @max_uV: Maximum required voltage in uV. 1605 * 1606 * Returns a boolean or a negative error code. 1607 */ 1608int regulator_is_supported_voltage(struct regulator *regulator, 1609 int min_uV, int max_uV) 1610{ 1611 int i, voltages, ret; 1612 1613 ret = regulator_count_voltages(regulator); 1614 if (ret < 0) 1615 return ret; 1616 voltages = ret; 1617 1618 for (i = 0; i < voltages; i++) { 1619 ret = regulator_list_voltage(regulator, i); 1620 1621 if (ret >= min_uV && ret <= max_uV) 1622 return 1; 1623 } 1624 1625 return 0; 1626} 1627 1628static int _regulator_do_set_voltage(struct regulator_dev *rdev, 1629 int min_uV, int max_uV) 1630{ 1631 int ret; 1632 unsigned int selector; 1633 1634 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 1635 1636 if (rdev->desc->ops->set_voltage) { 1637 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 1638 &selector); 1639 1640 if (rdev->desc->ops->list_voltage) 1641 selector = rdev->desc->ops->list_voltage(rdev, 1642 selector); 1643 else 1644 selector = -1; 1645 } else if (rdev->desc->ops->set_voltage_sel) { 1646 int best_val = INT_MAX; 1647 int i; 1648 1649 selector = 0; 1650 1651 /* Find the smallest voltage that falls within the specified 1652 * range. 1653 */ 1654 for (i = 0; i < rdev->desc->n_voltages; i++) { 1655 ret = rdev->desc->ops->list_voltage(rdev, i); 1656 if (ret < 0) 1657 continue; 1658 1659 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1660 best_val = ret; 1661 selector = i; 1662 } 1663 } 1664 1665 if (best_val != INT_MAX) { 1666 ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1667 selector = best_val; 1668 } else { 1669 ret = -EINVAL; 1670 } 1671 } else { 1672 ret = -EINVAL; 1673 } 1674 1675 if (ret == 0) 1676 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1677 NULL); 1678 1679 trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 1680 1681 return ret; 1682} 1683 1684/** 1685 * regulator_set_voltage - set regulator output voltage 1686 * @regulator: regulator source 1687 * @min_uV: Minimum required voltage in uV 1688 * @max_uV: Maximum acceptable voltage in uV 1689 * 1690 * Sets a voltage regulator to the desired output voltage. This can be set 1691 * during any regulator state. IOW, regulator can be disabled or enabled. 1692 * 1693 * If the regulator is enabled then the voltage will change to the new value 1694 * immediately otherwise if the regulator is disabled the regulator will 1695 * output at the new voltage when enabled. 1696 * 1697 * NOTE: If the regulator is shared between several devices then the lowest 1698 * request voltage that meets the system constraints will be used. 1699 * Regulator system constraints must be set for this regulator before 1700 * calling this function otherwise this call will fail. 1701 */ 1702int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1703{ 1704 struct regulator_dev *rdev = regulator->rdev; 1705 int ret = 0; 1706 1707 mutex_lock(&rdev->mutex); 1708 1709 /* If we're setting the same range as last time the change 1710 * should be a noop (some cpufreq implementations use the same 1711 * voltage for multiple frequencies, for example). 1712 */ 1713 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 1714 goto out; 1715 1716 /* sanity check */ 1717 if (!rdev->desc->ops->set_voltage && 1718 !rdev->desc->ops->set_voltage_sel) { 1719 ret = -EINVAL; 1720 goto out; 1721 } 1722 1723 /* constraints check */ 1724 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1725 if (ret < 0) 1726 goto out; 1727 regulator->min_uV = min_uV; 1728 regulator->max_uV = max_uV; 1729 1730 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1731 if (ret < 0) 1732 goto out; 1733 1734 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1735 1736out: 1737 mutex_unlock(&rdev->mutex); 1738 return ret; 1739} 1740EXPORT_SYMBOL_GPL(regulator_set_voltage); 1741 1742/** 1743 * regulator_sync_voltage - re-apply last regulator output voltage 1744 * @regulator: regulator source 1745 * 1746 * Re-apply the last configured voltage. This is intended to be used 1747 * where some external control source the consumer is cooperating with 1748 * has caused the configured voltage to change. 1749 */ 1750int regulator_sync_voltage(struct regulator *regulator) 1751{ 1752 struct regulator_dev *rdev = regulator->rdev; 1753 int ret, min_uV, max_uV; 1754 1755 mutex_lock(&rdev->mutex); 1756 1757 if (!rdev->desc->ops->set_voltage && 1758 !rdev->desc->ops->set_voltage_sel) { 1759 ret = -EINVAL; 1760 goto out; 1761 } 1762 1763 /* This is only going to work if we've had a voltage configured. */ 1764 if (!regulator->min_uV && !regulator->max_uV) { 1765 ret = -EINVAL; 1766 goto out; 1767 } 1768 1769 min_uV = regulator->min_uV; 1770 max_uV = regulator->max_uV; 1771 1772 /* This should be a paranoia check... */ 1773 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1774 if (ret < 0) 1775 goto out; 1776 1777 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1778 if (ret < 0) 1779 goto out; 1780 1781 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1782 1783out: 1784 mutex_unlock(&rdev->mutex); 1785 return ret; 1786} 1787EXPORT_SYMBOL_GPL(regulator_sync_voltage); 1788 1789static int _regulator_get_voltage(struct regulator_dev *rdev) 1790{ 1791 int sel; 1792 1793 if (rdev->desc->ops->get_voltage_sel) { 1794 sel = rdev->desc->ops->get_voltage_sel(rdev); 1795 if (sel < 0) 1796 return sel; 1797 return rdev->desc->ops->list_voltage(rdev, sel); 1798 } 1799 if (rdev->desc->ops->get_voltage) 1800 return rdev->desc->ops->get_voltage(rdev); 1801 else 1802 return -EINVAL; 1803} 1804 1805/** 1806 * regulator_get_voltage - get regulator output voltage 1807 * @regulator: regulator source 1808 * 1809 * This returns the current regulator voltage in uV. 1810 * 1811 * NOTE: If the regulator is disabled it will return the voltage value. This 1812 * function should not be used to determine regulator state. 1813 */ 1814int regulator_get_voltage(struct regulator *regulator) 1815{ 1816 int ret; 1817 1818 mutex_lock(®ulator->rdev->mutex); 1819 1820 ret = _regulator_get_voltage(regulator->rdev); 1821 1822 mutex_unlock(®ulator->rdev->mutex); 1823 1824 return ret; 1825} 1826EXPORT_SYMBOL_GPL(regulator_get_voltage); 1827 1828/** 1829 * regulator_set_current_limit - set regulator output current limit 1830 * @regulator: regulator source 1831 * @min_uA: Minimuum supported current in uA 1832 * @max_uA: Maximum supported current in uA 1833 * 1834 * Sets current sink to the desired output current. This can be set during 1835 * any regulator state. IOW, regulator can be disabled or enabled. 1836 * 1837 * If the regulator is enabled then the current will change to the new value 1838 * immediately otherwise if the regulator is disabled the regulator will 1839 * output at the new current when enabled. 1840 * 1841 * NOTE: Regulator system constraints must be set for this regulator before 1842 * calling this function otherwise this call will fail. 1843 */ 1844int regulator_set_current_limit(struct regulator *regulator, 1845 int min_uA, int max_uA) 1846{ 1847 struct regulator_dev *rdev = regulator->rdev; 1848 int ret; 1849 1850 mutex_lock(&rdev->mutex); 1851 1852 /* sanity check */ 1853 if (!rdev->desc->ops->set_current_limit) { 1854 ret = -EINVAL; 1855 goto out; 1856 } 1857 1858 /* constraints check */ 1859 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1860 if (ret < 0) 1861 goto out; 1862 1863 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1864out: 1865 mutex_unlock(&rdev->mutex); 1866 return ret; 1867} 1868EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1869 1870static int _regulator_get_current_limit(struct regulator_dev *rdev) 1871{ 1872 int ret; 1873 1874 mutex_lock(&rdev->mutex); 1875 1876 /* sanity check */ 1877 if (!rdev->desc->ops->get_current_limit) { 1878 ret = -EINVAL; 1879 goto out; 1880 } 1881 1882 ret = rdev->desc->ops->get_current_limit(rdev); 1883out: 1884 mutex_unlock(&rdev->mutex); 1885 return ret; 1886} 1887 1888/** 1889 * regulator_get_current_limit - get regulator output current 1890 * @regulator: regulator source 1891 * 1892 * This returns the current supplied by the specified current sink in uA. 1893 * 1894 * NOTE: If the regulator is disabled it will return the current value. This 1895 * function should not be used to determine regulator state. 1896 */ 1897int regulator_get_current_limit(struct regulator *regulator) 1898{ 1899 return _regulator_get_current_limit(regulator->rdev); 1900} 1901EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1902 1903/** 1904 * regulator_set_mode - set regulator operating mode 1905 * @regulator: regulator source 1906 * @mode: operating mode - one of the REGULATOR_MODE constants 1907 * 1908 * Set regulator operating mode to increase regulator efficiency or improve 1909 * regulation performance. 1910 * 1911 * NOTE: Regulator system constraints must be set for this regulator before 1912 * calling this function otherwise this call will fail. 1913 */ 1914int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1915{ 1916 struct regulator_dev *rdev = regulator->rdev; 1917 int ret; 1918 int regulator_curr_mode; 1919 1920 mutex_lock(&rdev->mutex); 1921 1922 /* sanity check */ 1923 if (!rdev->desc->ops->set_mode) { 1924 ret = -EINVAL; 1925 goto out; 1926 } 1927 1928 /* return if the same mode is requested */ 1929 if (rdev->desc->ops->get_mode) { 1930 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1931 if (regulator_curr_mode == mode) { 1932 ret = 0; 1933 goto out; 1934 } 1935 } 1936 1937 /* constraints check */ 1938 ret = regulator_check_mode(rdev, mode); 1939 if (ret < 0) 1940 goto out; 1941 1942 ret = rdev->desc->ops->set_mode(rdev, mode); 1943out: 1944 mutex_unlock(&rdev->mutex); 1945 return ret; 1946} 1947EXPORT_SYMBOL_GPL(regulator_set_mode); 1948 1949static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1950{ 1951 int ret; 1952 1953 mutex_lock(&rdev->mutex); 1954 1955 /* sanity check */ 1956 if (!rdev->desc->ops->get_mode) { 1957 ret = -EINVAL; 1958 goto out; 1959 } 1960 1961 ret = rdev->desc->ops->get_mode(rdev); 1962out: 1963 mutex_unlock(&rdev->mutex); 1964 return ret; 1965} 1966 1967/** 1968 * regulator_get_mode - get regulator operating mode 1969 * @regulator: regulator source 1970 * 1971 * Get the current regulator operating mode. 1972 */ 1973unsigned int regulator_get_mode(struct regulator *regulator) 1974{ 1975 return _regulator_get_mode(regulator->rdev); 1976} 1977EXPORT_SYMBOL_GPL(regulator_get_mode); 1978 1979/** 1980 * regulator_set_optimum_mode - set regulator optimum operating mode 1981 * @regulator: regulator source 1982 * @uA_load: load current 1983 * 1984 * Notifies the regulator core of a new device load. This is then used by 1985 * DRMS (if enabled by constraints) to set the most efficient regulator 1986 * operating mode for the new regulator loading. 1987 * 1988 * Consumer devices notify their supply regulator of the maximum power 1989 * they will require (can be taken from device datasheet in the power 1990 * consumption tables) when they change operational status and hence power 1991 * state. Examples of operational state changes that can affect power 1992 * consumption are :- 1993 * 1994 * o Device is opened / closed. 1995 * o Device I/O is about to begin or has just finished. 1996 * o Device is idling in between work. 1997 * 1998 * This information is also exported via sysfs to userspace. 1999 * 2000 * DRMS will sum the total requested load on the regulator and change 2001 * to the most efficient operating mode if platform constraints allow. 2002 * 2003 * Returns the new regulator mode or error. 2004 */ 2005int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2006{ 2007 struct regulator_dev *rdev = regulator->rdev; 2008 struct regulator *consumer; 2009 int ret, output_uV, input_uV, total_uA_load = 0; 2010 unsigned int mode; 2011 2012 mutex_lock(&rdev->mutex); 2013 2014 regulator->uA_load = uA_load; 2015 ret = regulator_check_drms(rdev); 2016 if (ret < 0) 2017 goto out; 2018 ret = -EINVAL; 2019 2020 /* sanity check */ 2021 if (!rdev->desc->ops->get_optimum_mode) 2022 goto out; 2023 2024 /* get output voltage */ 2025 output_uV = _regulator_get_voltage(rdev); 2026 if (output_uV <= 0) { 2027 rdev_err(rdev, "invalid output voltage found\n"); 2028 goto out; 2029 } 2030 2031 /* get input voltage */ 2032 input_uV = 0; 2033 if (rdev->supply) 2034 input_uV = _regulator_get_voltage(rdev->supply); 2035 if (input_uV <= 0) 2036 input_uV = rdev->constraints->input_uV; 2037 if (input_uV <= 0) { 2038 rdev_err(rdev, "invalid input voltage found\n"); 2039 goto out; 2040 } 2041 2042 /* calc total requested load for this regulator */ 2043 list_for_each_entry(consumer, &rdev->consumer_list, list) 2044 total_uA_load += consumer->uA_load; 2045 2046 mode = rdev->desc->ops->get_optimum_mode(rdev, 2047 input_uV, output_uV, 2048 total_uA_load); 2049 ret = regulator_check_mode(rdev, mode); 2050 if (ret < 0) { 2051 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2052 total_uA_load, input_uV, output_uV); 2053 goto out; 2054 } 2055 2056 ret = rdev->desc->ops->set_mode(rdev, mode); 2057 if (ret < 0) { 2058 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2059 goto out; 2060 } 2061 ret = mode; 2062out: 2063 mutex_unlock(&rdev->mutex); 2064 return ret; 2065} 2066EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2067 2068/** 2069 * regulator_register_notifier - register regulator event notifier 2070 * @regulator: regulator source 2071 * @nb: notifier block 2072 * 2073 * Register notifier block to receive regulator events. 2074 */ 2075int regulator_register_notifier(struct regulator *regulator, 2076 struct notifier_block *nb) 2077{ 2078 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2079 nb); 2080} 2081EXPORT_SYMBOL_GPL(regulator_register_notifier); 2082 2083/** 2084 * regulator_unregister_notifier - unregister regulator event notifier 2085 * @regulator: regulator source 2086 * @nb: notifier block 2087 * 2088 * Unregister regulator event notifier block. 2089 */ 2090int regulator_unregister_notifier(struct regulator *regulator, 2091 struct notifier_block *nb) 2092{ 2093 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2094 nb); 2095} 2096EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2097 2098/* notify regulator consumers and downstream regulator consumers. 2099 * Note mutex must be held by caller. 2100 */ 2101static void _notifier_call_chain(struct regulator_dev *rdev, 2102 unsigned long event, void *data) 2103{ 2104 struct regulator_dev *_rdev; 2105 2106 /* call rdev chain first */ 2107 blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2108 2109 /* now notify regulator we supply */ 2110 list_for_each_entry(_rdev, &rdev->supply_list, slist) { 2111 mutex_lock(&_rdev->mutex); 2112 _notifier_call_chain(_rdev, event, data); 2113 mutex_unlock(&_rdev->mutex); 2114 } 2115} 2116 2117/** 2118 * regulator_bulk_get - get multiple regulator consumers 2119 * 2120 * @dev: Device to supply 2121 * @num_consumers: Number of consumers to register 2122 * @consumers: Configuration of consumers; clients are stored here. 2123 * 2124 * @return 0 on success, an errno on failure. 2125 * 2126 * This helper function allows drivers to get several regulator 2127 * consumers in one operation. If any of the regulators cannot be 2128 * acquired then any regulators that were allocated will be freed 2129 * before returning to the caller. 2130 */ 2131int regulator_bulk_get(struct device *dev, int num_consumers, 2132 struct regulator_bulk_data *consumers) 2133{ 2134 int i; 2135 int ret; 2136 2137 for (i = 0; i < num_consumers; i++) 2138 consumers[i].consumer = NULL; 2139 2140 for (i = 0; i < num_consumers; i++) { 2141 consumers[i].consumer = regulator_get(dev, 2142 consumers[i].supply); 2143 if (IS_ERR(consumers[i].consumer)) { 2144 ret = PTR_ERR(consumers[i].consumer); 2145 dev_err(dev, "Failed to get supply '%s': %d\n", 2146 consumers[i].supply, ret); 2147 consumers[i].consumer = NULL; 2148 goto err; 2149 } 2150 } 2151 2152 return 0; 2153 2154err: 2155 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2156 regulator_put(consumers[i].consumer); 2157 2158 return ret; 2159} 2160EXPORT_SYMBOL_GPL(regulator_bulk_get); 2161 2162/** 2163 * regulator_bulk_enable - enable multiple regulator consumers 2164 * 2165 * @num_consumers: Number of consumers 2166 * @consumers: Consumer data; clients are stored here. 2167 * @return 0 on success, an errno on failure 2168 * 2169 * This convenience API allows consumers to enable multiple regulator 2170 * clients in a single API call. If any consumers cannot be enabled 2171 * then any others that were enabled will be disabled again prior to 2172 * return. 2173 */ 2174int regulator_bulk_enable(int num_consumers, 2175 struct regulator_bulk_data *consumers) 2176{ 2177 int i; 2178 int ret; 2179 2180 for (i = 0; i < num_consumers; i++) { 2181 ret = regulator_enable(consumers[i].consumer); 2182 if (ret != 0) 2183 goto err; 2184 } 2185 2186 return 0; 2187 2188err: 2189 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2190 for (--i; i >= 0; --i) 2191 regulator_disable(consumers[i].consumer); 2192 2193 return ret; 2194} 2195EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2196 2197/** 2198 * regulator_bulk_disable - disable multiple regulator consumers 2199 * 2200 * @num_consumers: Number of consumers 2201 * @consumers: Consumer data; clients are stored here. 2202 * @return 0 on success, an errno on failure 2203 * 2204 * This convenience API allows consumers to disable multiple regulator 2205 * clients in a single API call. If any consumers cannot be enabled 2206 * then any others that were disabled will be disabled again prior to 2207 * return. 2208 */ 2209int regulator_bulk_disable(int num_consumers, 2210 struct regulator_bulk_data *consumers) 2211{ 2212 int i; 2213 int ret; 2214 2215 for (i = 0; i < num_consumers; i++) { 2216 ret = regulator_disable(consumers[i].consumer); 2217 if (ret != 0) 2218 goto err; 2219 } 2220 2221 return 0; 2222 2223err: 2224 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2225 for (--i; i >= 0; --i) 2226 regulator_enable(consumers[i].consumer); 2227 2228 return ret; 2229} 2230EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2231 2232/** 2233 * regulator_bulk_free - free multiple regulator consumers 2234 * 2235 * @num_consumers: Number of consumers 2236 * @consumers: Consumer data; clients are stored here. 2237 * 2238 * This convenience API allows consumers to free multiple regulator 2239 * clients in a single API call. 2240 */ 2241void regulator_bulk_free(int num_consumers, 2242 struct regulator_bulk_data *consumers) 2243{ 2244 int i; 2245 2246 for (i = 0; i < num_consumers; i++) { 2247 regulator_put(consumers[i].consumer); 2248 consumers[i].consumer = NULL; 2249 } 2250} 2251EXPORT_SYMBOL_GPL(regulator_bulk_free); 2252 2253/** 2254 * regulator_notifier_call_chain - call regulator event notifier 2255 * @rdev: regulator source 2256 * @event: notifier block 2257 * @data: callback-specific data. 2258 * 2259 * Called by regulator drivers to notify clients a regulator event has 2260 * occurred. We also notify regulator clients downstream. 2261 * Note lock must be held by caller. 2262 */ 2263int regulator_notifier_call_chain(struct regulator_dev *rdev, 2264 unsigned long event, void *data) 2265{ 2266 _notifier_call_chain(rdev, event, data); 2267 return NOTIFY_DONE; 2268 2269} 2270EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2271 2272/** 2273 * regulator_mode_to_status - convert a regulator mode into a status 2274 * 2275 * @mode: Mode to convert 2276 * 2277 * Convert a regulator mode into a status. 2278 */ 2279int regulator_mode_to_status(unsigned int mode) 2280{ 2281 switch (mode) { 2282 case REGULATOR_MODE_FAST: 2283 return REGULATOR_STATUS_FAST; 2284 case REGULATOR_MODE_NORMAL: 2285 return REGULATOR_STATUS_NORMAL; 2286 case REGULATOR_MODE_IDLE: 2287 return REGULATOR_STATUS_IDLE; 2288 case REGULATOR_STATUS_STANDBY: 2289 return REGULATOR_STATUS_STANDBY; 2290 default: 2291 return 0; 2292 } 2293} 2294EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2295 2296/* 2297 * To avoid cluttering sysfs (and memory) with useless state, only 2298 * create attributes that can be meaningfully displayed. 2299 */ 2300static int add_regulator_attributes(struct regulator_dev *rdev) 2301{ 2302 struct device *dev = &rdev->dev; 2303 struct regulator_ops *ops = rdev->desc->ops; 2304 int status = 0; 2305 2306 /* some attributes need specific methods to be displayed */ 2307 if (ops->get_voltage || ops->get_voltage_sel) { 2308 status = device_create_file(dev, &dev_attr_microvolts); 2309 if (status < 0) 2310 return status; 2311 } 2312 if (ops->get_current_limit) { 2313 status = device_create_file(dev, &dev_attr_microamps); 2314 if (status < 0) 2315 return status; 2316 } 2317 if (ops->get_mode) { 2318 status = device_create_file(dev, &dev_attr_opmode); 2319 if (status < 0) 2320 return status; 2321 } 2322 if (ops->is_enabled) { 2323 status = device_create_file(dev, &dev_attr_state); 2324 if (status < 0) 2325 return status; 2326 } 2327 if (ops->get_status) { 2328 status = device_create_file(dev, &dev_attr_status); 2329 if (status < 0) 2330 return status; 2331 } 2332 2333 /* some attributes are type-specific */ 2334 if (rdev->desc->type == REGULATOR_CURRENT) { 2335 status = device_create_file(dev, &dev_attr_requested_microamps); 2336 if (status < 0) 2337 return status; 2338 } 2339 2340 /* all the other attributes exist to support constraints; 2341 * don't show them if there are no constraints, or if the 2342 * relevant supporting methods are missing. 2343 */ 2344 if (!rdev->constraints) 2345 return status; 2346 2347 /* constraints need specific supporting methods */ 2348 if (ops->set_voltage || ops->set_voltage_sel) { 2349 status = device_create_file(dev, &dev_attr_min_microvolts); 2350 if (status < 0) 2351 return status; 2352 status = device_create_file(dev, &dev_attr_max_microvolts); 2353 if (status < 0) 2354 return status; 2355 } 2356 if (ops->set_current_limit) { 2357 status = device_create_file(dev, &dev_attr_min_microamps); 2358 if (status < 0) 2359 return status; 2360 status = device_create_file(dev, &dev_attr_max_microamps); 2361 if (status < 0) 2362 return status; 2363 } 2364 2365 /* suspend mode constraints need multiple supporting methods */ 2366 if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 2367 return status; 2368 2369 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2370 if (status < 0) 2371 return status; 2372 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2373 if (status < 0) 2374 return status; 2375 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2376 if (status < 0) 2377 return status; 2378 2379 if (ops->set_suspend_voltage) { 2380 status = device_create_file(dev, 2381 &dev_attr_suspend_standby_microvolts); 2382 if (status < 0) 2383 return status; 2384 status = device_create_file(dev, 2385 &dev_attr_suspend_mem_microvolts); 2386 if (status < 0) 2387 return status; 2388 status = device_create_file(dev, 2389 &dev_attr_suspend_disk_microvolts); 2390 if (status < 0) 2391 return status; 2392 } 2393 2394 if (ops->set_suspend_mode) { 2395 status = device_create_file(dev, 2396 &dev_attr_suspend_standby_mode); 2397 if (status < 0) 2398 return status; 2399 status = device_create_file(dev, 2400 &dev_attr_suspend_mem_mode); 2401 if (status < 0) 2402 return status; 2403 status = device_create_file(dev, 2404 &dev_attr_suspend_disk_mode); 2405 if (status < 0) 2406 return status; 2407 } 2408 2409 return status; 2410} 2411 2412static void rdev_init_debugfs(struct regulator_dev *rdev) 2413{ 2414#ifdef CONFIG_DEBUG_FS 2415 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 2416 if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 2417 rdev_warn(rdev, "Failed to create debugfs directory\n"); 2418 rdev->debugfs = NULL; 2419 return; 2420 } 2421 2422 debugfs_create_u32("use_count", 0444, rdev->debugfs, 2423 &rdev->use_count); 2424 debugfs_create_u32("open_count", 0444, rdev->debugfs, 2425 &rdev->open_count); 2426#endif 2427} 2428 2429/** 2430 * regulator_register - register regulator 2431 * @regulator_desc: regulator to register 2432 * @dev: struct device for the regulator 2433 * @init_data: platform provided init data, passed through by driver 2434 * @driver_data: private regulator data 2435 * 2436 * Called by regulator drivers to register a regulator. 2437 * Returns 0 on success. 2438 */ 2439struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2440 struct device *dev, const struct regulator_init_data *init_data, 2441 void *driver_data) 2442{ 2443 static atomic_t regulator_no = ATOMIC_INIT(0); 2444 struct regulator_dev *rdev; 2445 int ret, i; 2446 2447 if (regulator_desc == NULL) 2448 return ERR_PTR(-EINVAL); 2449 2450 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2451 return ERR_PTR(-EINVAL); 2452 2453 if (regulator_desc->type != REGULATOR_VOLTAGE && 2454 regulator_desc->type != REGULATOR_CURRENT) 2455 return ERR_PTR(-EINVAL); 2456 2457 if (!init_data) 2458 return ERR_PTR(-EINVAL); 2459 2460 /* Only one of each should be implemented */ 2461 WARN_ON(regulator_desc->ops->get_voltage && 2462 regulator_desc->ops->get_voltage_sel); 2463 WARN_ON(regulator_desc->ops->set_voltage && 2464 regulator_desc->ops->set_voltage_sel); 2465 2466 /* If we're using selectors we must implement list_voltage. */ 2467 if (regulator_desc->ops->get_voltage_sel && 2468 !regulator_desc->ops->list_voltage) { 2469 return ERR_PTR(-EINVAL); 2470 } 2471 if (regulator_desc->ops->set_voltage_sel && 2472 !regulator_desc->ops->list_voltage) { 2473 return ERR_PTR(-EINVAL); 2474 } 2475 2476 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2477 if (rdev == NULL) 2478 return ERR_PTR(-ENOMEM); 2479 2480 mutex_lock(®ulator_list_mutex); 2481 2482 mutex_init(&rdev->mutex); 2483 rdev->reg_data = driver_data; 2484 rdev->owner = regulator_desc->owner; 2485 rdev->desc = regulator_desc; 2486 INIT_LIST_HEAD(&rdev->consumer_list); 2487 INIT_LIST_HEAD(&rdev->supply_list); 2488 INIT_LIST_HEAD(&rdev->list); 2489 INIT_LIST_HEAD(&rdev->slist); 2490 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2491 2492 /* preform any regulator specific init */ 2493 if (init_data->regulator_init) { 2494 ret = init_data->regulator_init(rdev->reg_data); 2495 if (ret < 0) 2496 goto clean; 2497 } 2498 2499 /* register with sysfs */ 2500 rdev->dev.class = ®ulator_class; 2501 rdev->dev.parent = dev; 2502 dev_set_name(&rdev->dev, "regulator.%d", 2503 atomic_inc_return(®ulator_no) - 1); 2504 ret = device_register(&rdev->dev); 2505 if (ret != 0) { 2506 put_device(&rdev->dev); 2507 goto clean; 2508 } 2509 2510 dev_set_drvdata(&rdev->dev, rdev); 2511 2512 /* set regulator constraints */ 2513 ret = set_machine_constraints(rdev, &init_data->constraints); 2514 if (ret < 0) 2515 goto scrub; 2516 2517 /* add attributes supported by this regulator */ 2518 ret = add_regulator_attributes(rdev); 2519 if (ret < 0) 2520 goto scrub; 2521 2522 /* set supply regulator if it exists */ 2523 if (init_data->supply_regulator && init_data->supply_regulator_dev) { 2524 dev_err(dev, 2525 "Supply regulator specified by both name and dev\n"); 2526 ret = -EINVAL; 2527 goto scrub; 2528 } 2529 2530 if (init_data->supply_regulator) { 2531 struct regulator_dev *r; 2532 int found = 0; 2533 2534 list_for_each_entry(r, ®ulator_list, list) { 2535 if (strcmp(rdev_get_name(r), 2536 init_data->supply_regulator) == 0) { 2537 found = 1; 2538 break; 2539 } 2540 } 2541 2542 if (!found) { 2543 dev_err(dev, "Failed to find supply %s\n", 2544 init_data->supply_regulator); 2545 ret = -ENODEV; 2546 goto scrub; 2547 } 2548 2549 ret = set_supply(rdev, r); 2550 if (ret < 0) 2551 goto scrub; 2552 } 2553 2554 if (init_data->supply_regulator_dev) { 2555 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2556 ret = set_supply(rdev, 2557 dev_get_drvdata(init_data->supply_regulator_dev)); 2558 if (ret < 0) 2559 goto scrub; 2560 } 2561 2562 /* add consumers devices */ 2563 for (i = 0; i < init_data->num_consumer_supplies; i++) { 2564 ret = set_consumer_device_supply(rdev, 2565 init_data->consumer_supplies[i].dev, 2566 init_data->consumer_supplies[i].dev_name, 2567 init_data->consumer_supplies[i].supply); 2568 if (ret < 0) 2569 goto unset_supplies; 2570 } 2571 2572 list_add(&rdev->list, ®ulator_list); 2573 2574 rdev_init_debugfs(rdev); 2575out: 2576 mutex_unlock(®ulator_list_mutex); 2577 return rdev; 2578 2579unset_supplies: 2580 unset_regulator_supplies(rdev); 2581 2582scrub: 2583 device_unregister(&rdev->dev); 2584 /* device core frees rdev */ 2585 rdev = ERR_PTR(ret); 2586 goto out; 2587 2588clean: 2589 kfree(rdev); 2590 rdev = ERR_PTR(ret); 2591 goto out; 2592} 2593EXPORT_SYMBOL_GPL(regulator_register); 2594 2595/** 2596 * regulator_unregister - unregister regulator 2597 * @rdev: regulator to unregister 2598 * 2599 * Called by regulator drivers to unregister a regulator. 2600 */ 2601void regulator_unregister(struct regulator_dev *rdev) 2602{ 2603 if (rdev == NULL) 2604 return; 2605 2606 mutex_lock(®ulator_list_mutex); 2607#ifdef CONFIG_DEBUG_FS 2608 debugfs_remove_recursive(rdev->debugfs); 2609#endif 2610 WARN_ON(rdev->open_count); 2611 unset_regulator_supplies(rdev); 2612 list_del(&rdev->list); 2613 if (rdev->supply) 2614 sysfs_remove_link(&rdev->dev.kobj, "supply"); 2615 device_unregister(&rdev->dev); 2616 kfree(rdev->constraints); 2617 mutex_unlock(®ulator_list_mutex); 2618} 2619EXPORT_SYMBOL_GPL(regulator_unregister); 2620 2621/** 2622 * regulator_suspend_prepare - prepare regulators for system wide suspend 2623 * @state: system suspend state 2624 * 2625 * Configure each regulator with it's suspend operating parameters for state. 2626 * This will usually be called by machine suspend code prior to supending. 2627 */ 2628int regulator_suspend_prepare(suspend_state_t state) 2629{ 2630 struct regulator_dev *rdev; 2631 int ret = 0; 2632 2633 /* ON is handled by regulator active state */ 2634 if (state == PM_SUSPEND_ON) 2635 return -EINVAL; 2636 2637 mutex_lock(®ulator_list_mutex); 2638 list_for_each_entry(rdev, ®ulator_list, list) { 2639 2640 mutex_lock(&rdev->mutex); 2641 ret = suspend_prepare(rdev, state); 2642 mutex_unlock(&rdev->mutex); 2643 2644 if (ret < 0) { 2645 rdev_err(rdev, "failed to prepare\n"); 2646 goto out; 2647 } 2648 } 2649out: 2650 mutex_unlock(®ulator_list_mutex); 2651 return ret; 2652} 2653EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2654 2655/** 2656 * regulator_has_full_constraints - the system has fully specified constraints 2657 * 2658 * Calling this function will cause the regulator API to disable all 2659 * regulators which have a zero use count and don't have an always_on 2660 * constraint in a late_initcall. 2661 * 2662 * The intention is that this will become the default behaviour in a 2663 * future kernel release so users are encouraged to use this facility 2664 * now. 2665 */ 2666void regulator_has_full_constraints(void) 2667{ 2668 has_full_constraints = 1; 2669} 2670EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2671 2672/** 2673 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2674 * 2675 * Calling this function will cause the regulator API to provide a 2676 * dummy regulator to consumers if no physical regulator is found, 2677 * allowing most consumers to proceed as though a regulator were 2678 * configured. This allows systems such as those with software 2679 * controllable regulators for the CPU core only to be brought up more 2680 * readily. 2681 */ 2682void regulator_use_dummy_regulator(void) 2683{ 2684 board_wants_dummy_regulator = true; 2685} 2686EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2687 2688/** 2689 * rdev_get_drvdata - get rdev regulator driver data 2690 * @rdev: regulator 2691 * 2692 * Get rdev regulator driver private data. This call can be used in the 2693 * regulator driver context. 2694 */ 2695void *rdev_get_drvdata(struct regulator_dev *rdev) 2696{ 2697 return rdev->reg_data; 2698} 2699EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2700 2701/** 2702 * regulator_get_drvdata - get regulator driver data 2703 * @regulator: regulator 2704 * 2705 * Get regulator driver private data. This call can be used in the consumer 2706 * driver context when non API regulator specific functions need to be called. 2707 */ 2708void *regulator_get_drvdata(struct regulator *regulator) 2709{ 2710 return regulator->rdev->reg_data; 2711} 2712EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2713 2714/** 2715 * regulator_set_drvdata - set regulator driver data 2716 * @regulator: regulator 2717 * @data: data 2718 */ 2719void regulator_set_drvdata(struct regulator *regulator, void *data) 2720{ 2721 regulator->rdev->reg_data = data; 2722} 2723EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2724 2725/** 2726 * regulator_get_id - get regulator ID 2727 * @rdev: regulator 2728 */ 2729int rdev_get_id(struct regulator_dev *rdev) 2730{ 2731 return rdev->desc->id; 2732} 2733EXPORT_SYMBOL_GPL(rdev_get_id); 2734 2735struct device *rdev_get_dev(struct regulator_dev *rdev) 2736{ 2737 return &rdev->dev; 2738} 2739EXPORT_SYMBOL_GPL(rdev_get_dev); 2740 2741void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2742{ 2743 return reg_init_data->driver_data; 2744} 2745EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2746 2747static int __init regulator_init(void) 2748{ 2749 int ret; 2750 2751 ret = class_register(®ulator_class); 2752 2753#ifdef CONFIG_DEBUG_FS 2754 debugfs_root = debugfs_create_dir("regulator", NULL); 2755 if (IS_ERR(debugfs_root) || !debugfs_root) { 2756 pr_warn("regulator: Failed to create debugfs directory\n"); 2757 debugfs_root = NULL; 2758 } 2759#endif 2760 2761 regulator_dummy_init(); 2762 2763 return ret; 2764} 2765 2766/* init early to allow our consumers to complete system booting */ 2767core_initcall(regulator_init); 2768 2769static int __init regulator_init_complete(void) 2770{ 2771 struct regulator_dev *rdev; 2772 struct regulator_ops *ops; 2773 struct regulation_constraints *c; 2774 int enabled, ret; 2775 2776 mutex_lock(®ulator_list_mutex); 2777 2778 /* If we have a full configuration then disable any regulators 2779 * which are not in use or always_on. This will become the 2780 * default behaviour in the future. 2781 */ 2782 list_for_each_entry(rdev, ®ulator_list, list) { 2783 ops = rdev->desc->ops; 2784 c = rdev->constraints; 2785 2786 if (!ops->disable || (c && c->always_on)) 2787 continue; 2788 2789 mutex_lock(&rdev->mutex); 2790 2791 if (rdev->use_count) 2792 goto unlock; 2793 2794 /* If we can't read the status assume it's on. */ 2795 if (ops->is_enabled) 2796 enabled = ops->is_enabled(rdev); 2797 else 2798 enabled = 1; 2799 2800 if (!enabled) 2801 goto unlock; 2802 2803 if (has_full_constraints) { 2804 /* We log since this may kill the system if it 2805 * goes wrong. */ 2806 rdev_info(rdev, "disabling\n"); 2807 ret = ops->disable(rdev); 2808 if (ret != 0) { 2809 rdev_err(rdev, "couldn't disable: %d\n", ret); 2810 } 2811 } else { 2812 /* The intention is that in future we will 2813 * assume that full constraints are provided 2814 * so warn even if we aren't going to do 2815 * anything here. 2816 */ 2817 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 2818 } 2819 2820unlock: 2821 mutex_unlock(&rdev->mutex); 2822 } 2823 2824 mutex_unlock(®ulator_list_mutex); 2825 2826 return 0; 2827} 2828late_initcall(regulator_init_complete); 2829