core.c revision bf2516cd020dbf80ed2f1750ac1f4b0da3549c91
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/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/of.h> 27#include <linux/regmap.h> 28#include <linux/regulator/of_regulator.h> 29#include <linux/regulator/consumer.h> 30#include <linux/regulator/driver.h> 31#include <linux/regulator/machine.h> 32#include <linux/module.h> 33 34#define CREATE_TRACE_POINTS 35#include <trace/events/regulator.h> 36 37#include "dummy.h" 38 39#define rdev_crit(rdev, fmt, ...) \ 40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_err(rdev, fmt, ...) \ 42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_warn(rdev, fmt, ...) \ 44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_info(rdev, fmt, ...) \ 46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_dbg(rdev, fmt, ...) \ 48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49 50static DEFINE_MUTEX(regulator_list_mutex); 51static LIST_HEAD(regulator_list); 52static LIST_HEAD(regulator_map_list); 53static bool has_full_constraints; 54static bool board_wants_dummy_regulator; 55 56static struct dentry *debugfs_root; 57 58/* 59 * struct regulator_map 60 * 61 * Used to provide symbolic supply names to devices. 62 */ 63struct regulator_map { 64 struct list_head list; 65 const char *dev_name; /* The dev_name() for the consumer */ 66 const char *supply; 67 struct regulator_dev *regulator; 68}; 69 70/* 71 * struct regulator 72 * 73 * One for each consumer device. 74 */ 75struct regulator { 76 struct device *dev; 77 struct list_head list; 78 unsigned int always_on:1; 79 int uA_load; 80 int min_uV; 81 int max_uV; 82 char *supply_name; 83 struct device_attribute dev_attr; 84 struct regulator_dev *rdev; 85 struct dentry *debugfs; 86}; 87 88static int _regulator_is_enabled(struct regulator_dev *rdev); 89static int _regulator_disable(struct regulator_dev *rdev); 90static int _regulator_get_voltage(struct regulator_dev *rdev); 91static int _regulator_get_current_limit(struct regulator_dev *rdev); 92static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 93static void _notifier_call_chain(struct regulator_dev *rdev, 94 unsigned long event, void *data); 95static int _regulator_do_set_voltage(struct regulator_dev *rdev, 96 int min_uV, int max_uV); 97static struct regulator *create_regulator(struct regulator_dev *rdev, 98 struct device *dev, 99 const char *supply_name); 100 101static const char *rdev_get_name(struct regulator_dev *rdev) 102{ 103 if (rdev->constraints && rdev->constraints->name) 104 return rdev->constraints->name; 105 else if (rdev->desc->name) 106 return rdev->desc->name; 107 else 108 return ""; 109} 110 111/** 112 * of_get_regulator - get a regulator device node based on supply name 113 * @dev: Device pointer for the consumer (of regulator) device 114 * @supply: regulator supply name 115 * 116 * Extract the regulator device node corresponding to the supply name. 117 * retruns the device node corresponding to the regulator if found, else 118 * returns NULL. 119 */ 120static struct device_node *of_get_regulator(struct device *dev, const char *supply) 121{ 122 struct device_node *regnode = NULL; 123 char prop_name[32]; /* 32 is max size of property name */ 124 125 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 126 127 snprintf(prop_name, 32, "%s-supply", supply); 128 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 129 130 if (!regnode) { 131 dev_dbg(dev, "Looking up %s property in node %s failed", 132 prop_name, dev->of_node->full_name); 133 return NULL; 134 } 135 return regnode; 136} 137 138static int _regulator_can_change_status(struct regulator_dev *rdev) 139{ 140 if (!rdev->constraints) 141 return 0; 142 143 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 144 return 1; 145 else 146 return 0; 147} 148 149/* Platform voltage constraint check */ 150static int regulator_check_voltage(struct regulator_dev *rdev, 151 int *min_uV, int *max_uV) 152{ 153 BUG_ON(*min_uV > *max_uV); 154 155 if (!rdev->constraints) { 156 rdev_err(rdev, "no constraints\n"); 157 return -ENODEV; 158 } 159 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 160 rdev_err(rdev, "operation not allowed\n"); 161 return -EPERM; 162 } 163 164 if (*max_uV > rdev->constraints->max_uV) 165 *max_uV = rdev->constraints->max_uV; 166 if (*min_uV < rdev->constraints->min_uV) 167 *min_uV = rdev->constraints->min_uV; 168 169 if (*min_uV > *max_uV) { 170 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 171 *min_uV, *max_uV); 172 return -EINVAL; 173 } 174 175 return 0; 176} 177 178/* Make sure we select a voltage that suits the needs of all 179 * regulator consumers 180 */ 181static int regulator_check_consumers(struct regulator_dev *rdev, 182 int *min_uV, int *max_uV) 183{ 184 struct regulator *regulator; 185 186 list_for_each_entry(regulator, &rdev->consumer_list, list) { 187 /* 188 * Assume consumers that didn't say anything are OK 189 * with anything in the constraint range. 190 */ 191 if (!regulator->min_uV && !regulator->max_uV) 192 continue; 193 194 if (*max_uV > regulator->max_uV) 195 *max_uV = regulator->max_uV; 196 if (*min_uV < regulator->min_uV) 197 *min_uV = regulator->min_uV; 198 } 199 200 if (*min_uV > *max_uV) 201 return -EINVAL; 202 203 return 0; 204} 205 206/* current constraint check */ 207static int regulator_check_current_limit(struct regulator_dev *rdev, 208 int *min_uA, int *max_uA) 209{ 210 BUG_ON(*min_uA > *max_uA); 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_CURRENT)) { 217 rdev_err(rdev, "operation not allowed\n"); 218 return -EPERM; 219 } 220 221 if (*max_uA > rdev->constraints->max_uA) 222 *max_uA = rdev->constraints->max_uA; 223 if (*min_uA < rdev->constraints->min_uA) 224 *min_uA = rdev->constraints->min_uA; 225 226 if (*min_uA > *max_uA) { 227 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 228 *min_uA, *max_uA); 229 return -EINVAL; 230 } 231 232 return 0; 233} 234 235/* operating mode constraint check */ 236static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 237{ 238 switch (*mode) { 239 case REGULATOR_MODE_FAST: 240 case REGULATOR_MODE_NORMAL: 241 case REGULATOR_MODE_IDLE: 242 case REGULATOR_MODE_STANDBY: 243 break; 244 default: 245 rdev_err(rdev, "invalid mode %x specified\n", *mode); 246 return -EINVAL; 247 } 248 249 if (!rdev->constraints) { 250 rdev_err(rdev, "no constraints\n"); 251 return -ENODEV; 252 } 253 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 254 rdev_err(rdev, "operation not allowed\n"); 255 return -EPERM; 256 } 257 258 /* The modes are bitmasks, the most power hungry modes having 259 * the lowest values. If the requested mode isn't supported 260 * try higher modes. */ 261 while (*mode) { 262 if (rdev->constraints->valid_modes_mask & *mode) 263 return 0; 264 *mode /= 2; 265 } 266 267 return -EINVAL; 268} 269 270/* dynamic regulator mode switching constraint check */ 271static int regulator_check_drms(struct regulator_dev *rdev) 272{ 273 if (!rdev->constraints) { 274 rdev_err(rdev, "no constraints\n"); 275 return -ENODEV; 276 } 277 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 278 rdev_err(rdev, "operation not allowed\n"); 279 return -EPERM; 280 } 281 return 0; 282} 283 284static ssize_t regulator_uV_show(struct device *dev, 285 struct device_attribute *attr, char *buf) 286{ 287 struct regulator_dev *rdev = dev_get_drvdata(dev); 288 ssize_t ret; 289 290 mutex_lock(&rdev->mutex); 291 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 292 mutex_unlock(&rdev->mutex); 293 294 return ret; 295} 296static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 297 298static ssize_t regulator_uA_show(struct device *dev, 299 struct device_attribute *attr, char *buf) 300{ 301 struct regulator_dev *rdev = dev_get_drvdata(dev); 302 303 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 304} 305static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 306 307static ssize_t regulator_name_show(struct device *dev, 308 struct device_attribute *attr, char *buf) 309{ 310 struct regulator_dev *rdev = dev_get_drvdata(dev); 311 312 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 313} 314 315static ssize_t regulator_print_opmode(char *buf, int mode) 316{ 317 switch (mode) { 318 case REGULATOR_MODE_FAST: 319 return sprintf(buf, "fast\n"); 320 case REGULATOR_MODE_NORMAL: 321 return sprintf(buf, "normal\n"); 322 case REGULATOR_MODE_IDLE: 323 return sprintf(buf, "idle\n"); 324 case REGULATOR_MODE_STANDBY: 325 return sprintf(buf, "standby\n"); 326 } 327 return sprintf(buf, "unknown\n"); 328} 329 330static ssize_t regulator_opmode_show(struct device *dev, 331 struct device_attribute *attr, char *buf) 332{ 333 struct regulator_dev *rdev = dev_get_drvdata(dev); 334 335 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 336} 337static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 338 339static ssize_t regulator_print_state(char *buf, int state) 340{ 341 if (state > 0) 342 return sprintf(buf, "enabled\n"); 343 else if (state == 0) 344 return sprintf(buf, "disabled\n"); 345 else 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_state_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 ssize_t ret; 354 355 mutex_lock(&rdev->mutex); 356 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 357 mutex_unlock(&rdev->mutex); 358 359 return ret; 360} 361static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 362 363static ssize_t regulator_status_show(struct device *dev, 364 struct device_attribute *attr, char *buf) 365{ 366 struct regulator_dev *rdev = dev_get_drvdata(dev); 367 int status; 368 char *label; 369 370 status = rdev->desc->ops->get_status(rdev); 371 if (status < 0) 372 return status; 373 374 switch (status) { 375 case REGULATOR_STATUS_OFF: 376 label = "off"; 377 break; 378 case REGULATOR_STATUS_ON: 379 label = "on"; 380 break; 381 case REGULATOR_STATUS_ERROR: 382 label = "error"; 383 break; 384 case REGULATOR_STATUS_FAST: 385 label = "fast"; 386 break; 387 case REGULATOR_STATUS_NORMAL: 388 label = "normal"; 389 break; 390 case REGULATOR_STATUS_IDLE: 391 label = "idle"; 392 break; 393 case REGULATOR_STATUS_STANDBY: 394 label = "standby"; 395 break; 396 default: 397 return -ERANGE; 398 } 399 400 return sprintf(buf, "%s\n", label); 401} 402static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 403 404static ssize_t regulator_min_uA_show(struct device *dev, 405 struct device_attribute *attr, char *buf) 406{ 407 struct regulator_dev *rdev = dev_get_drvdata(dev); 408 409 if (!rdev->constraints) 410 return sprintf(buf, "constraint not defined\n"); 411 412 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 413} 414static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 415 416static ssize_t regulator_max_uA_show(struct device *dev, 417 struct device_attribute *attr, char *buf) 418{ 419 struct regulator_dev *rdev = dev_get_drvdata(dev); 420 421 if (!rdev->constraints) 422 return sprintf(buf, "constraint not defined\n"); 423 424 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 425} 426static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 427 428static ssize_t regulator_min_uV_show(struct device *dev, 429 struct device_attribute *attr, char *buf) 430{ 431 struct regulator_dev *rdev = dev_get_drvdata(dev); 432 433 if (!rdev->constraints) 434 return sprintf(buf, "constraint not defined\n"); 435 436 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 437} 438static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 439 440static ssize_t regulator_max_uV_show(struct device *dev, 441 struct device_attribute *attr, char *buf) 442{ 443 struct regulator_dev *rdev = dev_get_drvdata(dev); 444 445 if (!rdev->constraints) 446 return sprintf(buf, "constraint not defined\n"); 447 448 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 449} 450static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 451 452static ssize_t regulator_total_uA_show(struct device *dev, 453 struct device_attribute *attr, char *buf) 454{ 455 struct regulator_dev *rdev = dev_get_drvdata(dev); 456 struct regulator *regulator; 457 int uA = 0; 458 459 mutex_lock(&rdev->mutex); 460 list_for_each_entry(regulator, &rdev->consumer_list, list) 461 uA += regulator->uA_load; 462 mutex_unlock(&rdev->mutex); 463 return sprintf(buf, "%d\n", uA); 464} 465static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 466 467static ssize_t regulator_num_users_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 return sprintf(buf, "%d\n", rdev->use_count); 472} 473 474static ssize_t regulator_type_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 479 switch (rdev->desc->type) { 480 case REGULATOR_VOLTAGE: 481 return sprintf(buf, "voltage\n"); 482 case REGULATOR_CURRENT: 483 return sprintf(buf, "current\n"); 484 } 485 return sprintf(buf, "unknown\n"); 486} 487 488static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 489 struct device_attribute *attr, char *buf) 490{ 491 struct regulator_dev *rdev = dev_get_drvdata(dev); 492 493 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 494} 495static DEVICE_ATTR(suspend_mem_microvolts, 0444, 496 regulator_suspend_mem_uV_show, NULL); 497 498static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 499 struct device_attribute *attr, char *buf) 500{ 501 struct regulator_dev *rdev = dev_get_drvdata(dev); 502 503 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 504} 505static DEVICE_ATTR(suspend_disk_microvolts, 0444, 506 regulator_suspend_disk_uV_show, NULL); 507 508static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 509 struct device_attribute *attr, char *buf) 510{ 511 struct regulator_dev *rdev = dev_get_drvdata(dev); 512 513 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 514} 515static DEVICE_ATTR(suspend_standby_microvolts, 0444, 516 regulator_suspend_standby_uV_show, NULL); 517 518static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 519 struct device_attribute *attr, char *buf) 520{ 521 struct regulator_dev *rdev = dev_get_drvdata(dev); 522 523 return regulator_print_opmode(buf, 524 rdev->constraints->state_mem.mode); 525} 526static DEVICE_ATTR(suspend_mem_mode, 0444, 527 regulator_suspend_mem_mode_show, NULL); 528 529static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 530 struct device_attribute *attr, char *buf) 531{ 532 struct regulator_dev *rdev = dev_get_drvdata(dev); 533 534 return regulator_print_opmode(buf, 535 rdev->constraints->state_disk.mode); 536} 537static DEVICE_ATTR(suspend_disk_mode, 0444, 538 regulator_suspend_disk_mode_show, NULL); 539 540static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 541 struct device_attribute *attr, char *buf) 542{ 543 struct regulator_dev *rdev = dev_get_drvdata(dev); 544 545 return regulator_print_opmode(buf, 546 rdev->constraints->state_standby.mode); 547} 548static DEVICE_ATTR(suspend_standby_mode, 0444, 549 regulator_suspend_standby_mode_show, NULL); 550 551static ssize_t regulator_suspend_mem_state_show(struct device *dev, 552 struct device_attribute *attr, char *buf) 553{ 554 struct regulator_dev *rdev = dev_get_drvdata(dev); 555 556 return regulator_print_state(buf, 557 rdev->constraints->state_mem.enabled); 558} 559static DEVICE_ATTR(suspend_mem_state, 0444, 560 regulator_suspend_mem_state_show, NULL); 561 562static ssize_t regulator_suspend_disk_state_show(struct device *dev, 563 struct device_attribute *attr, char *buf) 564{ 565 struct regulator_dev *rdev = dev_get_drvdata(dev); 566 567 return regulator_print_state(buf, 568 rdev->constraints->state_disk.enabled); 569} 570static DEVICE_ATTR(suspend_disk_state, 0444, 571 regulator_suspend_disk_state_show, NULL); 572 573static ssize_t regulator_suspend_standby_state_show(struct device *dev, 574 struct device_attribute *attr, char *buf) 575{ 576 struct regulator_dev *rdev = dev_get_drvdata(dev); 577 578 return regulator_print_state(buf, 579 rdev->constraints->state_standby.enabled); 580} 581static DEVICE_ATTR(suspend_standby_state, 0444, 582 regulator_suspend_standby_state_show, NULL); 583 584 585/* 586 * These are the only attributes are present for all regulators. 587 * Other attributes are a function of regulator functionality. 588 */ 589static struct device_attribute regulator_dev_attrs[] = { 590 __ATTR(name, 0444, regulator_name_show, NULL), 591 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 592 __ATTR(type, 0444, regulator_type_show, NULL), 593 __ATTR_NULL, 594}; 595 596static void regulator_dev_release(struct device *dev) 597{ 598 struct regulator_dev *rdev = dev_get_drvdata(dev); 599 kfree(rdev); 600} 601 602static struct class regulator_class = { 603 .name = "regulator", 604 .dev_release = regulator_dev_release, 605 .dev_attrs = regulator_dev_attrs, 606}; 607 608/* Calculate the new optimum regulator operating mode based on the new total 609 * consumer load. All locks held by caller */ 610static void drms_uA_update(struct regulator_dev *rdev) 611{ 612 struct regulator *sibling; 613 int current_uA = 0, output_uV, input_uV, err; 614 unsigned int mode; 615 616 err = regulator_check_drms(rdev); 617 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 618 (!rdev->desc->ops->get_voltage && 619 !rdev->desc->ops->get_voltage_sel) || 620 !rdev->desc->ops->set_mode) 621 return; 622 623 /* get output voltage */ 624 output_uV = _regulator_get_voltage(rdev); 625 if (output_uV <= 0) 626 return; 627 628 /* get input voltage */ 629 input_uV = 0; 630 if (rdev->supply) 631 input_uV = regulator_get_voltage(rdev->supply); 632 if (input_uV <= 0) 633 input_uV = rdev->constraints->input_uV; 634 if (input_uV <= 0) 635 return; 636 637 /* calc total requested load */ 638 list_for_each_entry(sibling, &rdev->consumer_list, list) 639 current_uA += sibling->uA_load; 640 641 /* now get the optimum mode for our new total regulator load */ 642 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 643 output_uV, current_uA); 644 645 /* check the new mode is allowed */ 646 err = regulator_mode_constrain(rdev, &mode); 647 if (err == 0) 648 rdev->desc->ops->set_mode(rdev, mode); 649} 650 651static int suspend_set_state(struct regulator_dev *rdev, 652 struct regulator_state *rstate) 653{ 654 int ret = 0; 655 656 /* If we have no suspend mode configration don't set anything; 657 * only warn if the driver implements set_suspend_voltage or 658 * set_suspend_mode callback. 659 */ 660 if (!rstate->enabled && !rstate->disabled) { 661 if (rdev->desc->ops->set_suspend_voltage || 662 rdev->desc->ops->set_suspend_mode) 663 rdev_warn(rdev, "No configuration\n"); 664 return 0; 665 } 666 667 if (rstate->enabled && rstate->disabled) { 668 rdev_err(rdev, "invalid configuration\n"); 669 return -EINVAL; 670 } 671 672 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 673 ret = rdev->desc->ops->set_suspend_enable(rdev); 674 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 675 ret = rdev->desc->ops->set_suspend_disable(rdev); 676 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 677 ret = 0; 678 679 if (ret < 0) { 680 rdev_err(rdev, "failed to enabled/disable\n"); 681 return ret; 682 } 683 684 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 685 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 686 if (ret < 0) { 687 rdev_err(rdev, "failed to set voltage\n"); 688 return ret; 689 } 690 } 691 692 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 693 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 694 if (ret < 0) { 695 rdev_err(rdev, "failed to set mode\n"); 696 return ret; 697 } 698 } 699 return ret; 700} 701 702/* locks held by caller */ 703static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 704{ 705 if (!rdev->constraints) 706 return -EINVAL; 707 708 switch (state) { 709 case PM_SUSPEND_STANDBY: 710 return suspend_set_state(rdev, 711 &rdev->constraints->state_standby); 712 case PM_SUSPEND_MEM: 713 return suspend_set_state(rdev, 714 &rdev->constraints->state_mem); 715 case PM_SUSPEND_MAX: 716 return suspend_set_state(rdev, 717 &rdev->constraints->state_disk); 718 default: 719 return -EINVAL; 720 } 721} 722 723static void print_constraints(struct regulator_dev *rdev) 724{ 725 struct regulation_constraints *constraints = rdev->constraints; 726 char buf[80] = ""; 727 int count = 0; 728 int ret; 729 730 if (constraints->min_uV && constraints->max_uV) { 731 if (constraints->min_uV == constraints->max_uV) 732 count += sprintf(buf + count, "%d mV ", 733 constraints->min_uV / 1000); 734 else 735 count += sprintf(buf + count, "%d <--> %d mV ", 736 constraints->min_uV / 1000, 737 constraints->max_uV / 1000); 738 } 739 740 if (!constraints->min_uV || 741 constraints->min_uV != constraints->max_uV) { 742 ret = _regulator_get_voltage(rdev); 743 if (ret > 0) 744 count += sprintf(buf + count, "at %d mV ", ret / 1000); 745 } 746 747 if (constraints->uV_offset) 748 count += sprintf(buf, "%dmV offset ", 749 constraints->uV_offset / 1000); 750 751 if (constraints->min_uA && constraints->max_uA) { 752 if (constraints->min_uA == constraints->max_uA) 753 count += sprintf(buf + count, "%d mA ", 754 constraints->min_uA / 1000); 755 else 756 count += sprintf(buf + count, "%d <--> %d mA ", 757 constraints->min_uA / 1000, 758 constraints->max_uA / 1000); 759 } 760 761 if (!constraints->min_uA || 762 constraints->min_uA != constraints->max_uA) { 763 ret = _regulator_get_current_limit(rdev); 764 if (ret > 0) 765 count += sprintf(buf + count, "at %d mA ", ret / 1000); 766 } 767 768 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 769 count += sprintf(buf + count, "fast "); 770 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 771 count += sprintf(buf + count, "normal "); 772 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 773 count += sprintf(buf + count, "idle "); 774 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 775 count += sprintf(buf + count, "standby"); 776 777 rdev_info(rdev, "%s\n", buf); 778 779 if ((constraints->min_uV != constraints->max_uV) && 780 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 781 rdev_warn(rdev, 782 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 783} 784 785static int machine_constraints_voltage(struct regulator_dev *rdev, 786 struct regulation_constraints *constraints) 787{ 788 struct regulator_ops *ops = rdev->desc->ops; 789 int ret; 790 791 /* do we need to apply the constraint voltage */ 792 if (rdev->constraints->apply_uV && 793 rdev->constraints->min_uV == rdev->constraints->max_uV) { 794 ret = _regulator_do_set_voltage(rdev, 795 rdev->constraints->min_uV, 796 rdev->constraints->max_uV); 797 if (ret < 0) { 798 rdev_err(rdev, "failed to apply %duV constraint\n", 799 rdev->constraints->min_uV); 800 return ret; 801 } 802 } 803 804 /* constrain machine-level voltage specs to fit 805 * the actual range supported by this regulator. 806 */ 807 if (ops->list_voltage && rdev->desc->n_voltages) { 808 int count = rdev->desc->n_voltages; 809 int i; 810 int min_uV = INT_MAX; 811 int max_uV = INT_MIN; 812 int cmin = constraints->min_uV; 813 int cmax = constraints->max_uV; 814 815 /* it's safe to autoconfigure fixed-voltage supplies 816 and the constraints are used by list_voltage. */ 817 if (count == 1 && !cmin) { 818 cmin = 1; 819 cmax = INT_MAX; 820 constraints->min_uV = cmin; 821 constraints->max_uV = cmax; 822 } 823 824 /* voltage constraints are optional */ 825 if ((cmin == 0) && (cmax == 0)) 826 return 0; 827 828 /* else require explicit machine-level constraints */ 829 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 830 rdev_err(rdev, "invalid voltage constraints\n"); 831 return -EINVAL; 832 } 833 834 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 835 for (i = 0; i < count; i++) { 836 int value; 837 838 value = ops->list_voltage(rdev, i); 839 if (value <= 0) 840 continue; 841 842 /* maybe adjust [min_uV..max_uV] */ 843 if (value >= cmin && value < min_uV) 844 min_uV = value; 845 if (value <= cmax && value > max_uV) 846 max_uV = value; 847 } 848 849 /* final: [min_uV..max_uV] valid iff constraints valid */ 850 if (max_uV < min_uV) { 851 rdev_err(rdev, "unsupportable voltage constraints\n"); 852 return -EINVAL; 853 } 854 855 /* use regulator's subset of machine constraints */ 856 if (constraints->min_uV < min_uV) { 857 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 858 constraints->min_uV, min_uV); 859 constraints->min_uV = min_uV; 860 } 861 if (constraints->max_uV > max_uV) { 862 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 863 constraints->max_uV, max_uV); 864 constraints->max_uV = max_uV; 865 } 866 } 867 868 return 0; 869} 870 871/** 872 * set_machine_constraints - sets regulator constraints 873 * @rdev: regulator source 874 * @constraints: constraints to apply 875 * 876 * Allows platform initialisation code to define and constrain 877 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 878 * Constraints *must* be set by platform code in order for some 879 * regulator operations to proceed i.e. set_voltage, set_current_limit, 880 * set_mode. 881 */ 882static int set_machine_constraints(struct regulator_dev *rdev, 883 const struct regulation_constraints *constraints) 884{ 885 int ret = 0; 886 struct regulator_ops *ops = rdev->desc->ops; 887 888 if (constraints) 889 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 890 GFP_KERNEL); 891 else 892 rdev->constraints = kzalloc(sizeof(*constraints), 893 GFP_KERNEL); 894 if (!rdev->constraints) 895 return -ENOMEM; 896 897 ret = machine_constraints_voltage(rdev, rdev->constraints); 898 if (ret != 0) 899 goto out; 900 901 /* do we need to setup our suspend state */ 902 if (rdev->constraints->initial_state) { 903 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 904 if (ret < 0) { 905 rdev_err(rdev, "failed to set suspend state\n"); 906 goto out; 907 } 908 } 909 910 if (rdev->constraints->initial_mode) { 911 if (!ops->set_mode) { 912 rdev_err(rdev, "no set_mode operation\n"); 913 ret = -EINVAL; 914 goto out; 915 } 916 917 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 918 if (ret < 0) { 919 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 920 goto out; 921 } 922 } 923 924 /* If the constraints say the regulator should be on at this point 925 * and we have control then make sure it is enabled. 926 */ 927 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 928 ops->enable) { 929 ret = ops->enable(rdev); 930 if (ret < 0) { 931 rdev_err(rdev, "failed to enable\n"); 932 goto out; 933 } 934 } 935 936 print_constraints(rdev); 937 return 0; 938out: 939 kfree(rdev->constraints); 940 rdev->constraints = NULL; 941 return ret; 942} 943 944/** 945 * set_supply - set regulator supply regulator 946 * @rdev: regulator name 947 * @supply_rdev: supply regulator name 948 * 949 * Called by platform initialisation code to set the supply regulator for this 950 * regulator. This ensures that a regulators supply will also be enabled by the 951 * core if it's child is enabled. 952 */ 953static int set_supply(struct regulator_dev *rdev, 954 struct regulator_dev *supply_rdev) 955{ 956 int err; 957 958 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 959 960 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 961 if (rdev->supply == NULL) { 962 err = -ENOMEM; 963 return err; 964 } 965 966 return 0; 967} 968 969/** 970 * set_consumer_device_supply - Bind a regulator to a symbolic supply 971 * @rdev: regulator source 972 * @consumer_dev_name: dev_name() string for device supply applies to 973 * @supply: symbolic name for supply 974 * 975 * Allows platform initialisation code to map physical regulator 976 * sources to symbolic names for supplies for use by devices. Devices 977 * should use these symbolic names to request regulators, avoiding the 978 * need to provide board-specific regulator names as platform data. 979 */ 980static int set_consumer_device_supply(struct regulator_dev *rdev, 981 const char *consumer_dev_name, 982 const char *supply) 983{ 984 struct regulator_map *node; 985 int has_dev; 986 987 if (supply == NULL) 988 return -EINVAL; 989 990 if (consumer_dev_name != NULL) 991 has_dev = 1; 992 else 993 has_dev = 0; 994 995 list_for_each_entry(node, ®ulator_map_list, list) { 996 if (node->dev_name && consumer_dev_name) { 997 if (strcmp(node->dev_name, consumer_dev_name) != 0) 998 continue; 999 } else if (node->dev_name || consumer_dev_name) { 1000 continue; 1001 } 1002 1003 if (strcmp(node->supply, supply) != 0) 1004 continue; 1005 1006 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1007 consumer_dev_name, 1008 dev_name(&node->regulator->dev), 1009 node->regulator->desc->name, 1010 supply, 1011 dev_name(&rdev->dev), rdev_get_name(rdev)); 1012 return -EBUSY; 1013 } 1014 1015 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1016 if (node == NULL) 1017 return -ENOMEM; 1018 1019 node->regulator = rdev; 1020 node->supply = supply; 1021 1022 if (has_dev) { 1023 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1024 if (node->dev_name == NULL) { 1025 kfree(node); 1026 return -ENOMEM; 1027 } 1028 } 1029 1030 list_add(&node->list, ®ulator_map_list); 1031 return 0; 1032} 1033 1034static void unset_regulator_supplies(struct regulator_dev *rdev) 1035{ 1036 struct regulator_map *node, *n; 1037 1038 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1039 if (rdev == node->regulator) { 1040 list_del(&node->list); 1041 kfree(node->dev_name); 1042 kfree(node); 1043 } 1044 } 1045} 1046 1047#define REG_STR_SIZE 64 1048 1049static struct regulator *create_regulator(struct regulator_dev *rdev, 1050 struct device *dev, 1051 const char *supply_name) 1052{ 1053 struct regulator *regulator; 1054 char buf[REG_STR_SIZE]; 1055 int err, size; 1056 1057 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1058 if (regulator == NULL) 1059 return NULL; 1060 1061 mutex_lock(&rdev->mutex); 1062 regulator->rdev = rdev; 1063 list_add(®ulator->list, &rdev->consumer_list); 1064 1065 if (dev) { 1066 /* Add a link to the device sysfs entry */ 1067 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1068 dev->kobj.name, supply_name); 1069 if (size >= REG_STR_SIZE) 1070 goto overflow_err; 1071 1072 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1073 if (regulator->supply_name == NULL) 1074 goto overflow_err; 1075 1076 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1077 buf); 1078 if (err) { 1079 rdev_warn(rdev, "could not add device link %s err %d\n", 1080 dev->kobj.name, err); 1081 /* non-fatal */ 1082 } 1083 } else { 1084 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1085 if (regulator->supply_name == NULL) 1086 goto overflow_err; 1087 } 1088 1089 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1090 rdev->debugfs); 1091 if (!regulator->debugfs) { 1092 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1093 } else { 1094 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1095 ®ulator->uA_load); 1096 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1097 ®ulator->min_uV); 1098 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1099 ®ulator->max_uV); 1100 } 1101 1102 /* 1103 * Check now if the regulator is an always on regulator - if 1104 * it is then we don't need to do nearly so much work for 1105 * enable/disable calls. 1106 */ 1107 if (!_regulator_can_change_status(rdev) && 1108 _regulator_is_enabled(rdev)) 1109 regulator->always_on = true; 1110 1111 mutex_unlock(&rdev->mutex); 1112 return regulator; 1113overflow_err: 1114 list_del(®ulator->list); 1115 kfree(regulator); 1116 mutex_unlock(&rdev->mutex); 1117 return NULL; 1118} 1119 1120static int _regulator_get_enable_time(struct regulator_dev *rdev) 1121{ 1122 if (!rdev->desc->ops->enable_time) 1123 return 0; 1124 return rdev->desc->ops->enable_time(rdev); 1125} 1126 1127static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1128 const char *supply, 1129 int *ret) 1130{ 1131 struct regulator_dev *r; 1132 struct device_node *node; 1133 struct regulator_map *map; 1134 const char *devname = NULL; 1135 1136 /* first do a dt based lookup */ 1137 if (dev && dev->of_node) { 1138 node = of_get_regulator(dev, supply); 1139 if (node) { 1140 list_for_each_entry(r, ®ulator_list, list) 1141 if (r->dev.parent && 1142 node == r->dev.of_node) 1143 return r; 1144 } else { 1145 /* 1146 * If we couldn't even get the node then it's 1147 * not just that the device didn't register 1148 * yet, there's no node and we'll never 1149 * succeed. 1150 */ 1151 *ret = -ENODEV; 1152 } 1153 } 1154 1155 /* if not found, try doing it non-dt way */ 1156 if (dev) 1157 devname = dev_name(dev); 1158 1159 list_for_each_entry(r, ®ulator_list, list) 1160 if (strcmp(rdev_get_name(r), supply) == 0) 1161 return r; 1162 1163 list_for_each_entry(map, ®ulator_map_list, list) { 1164 /* If the mapping has a device set up it must match */ 1165 if (map->dev_name && 1166 (!devname || strcmp(map->dev_name, devname))) 1167 continue; 1168 1169 if (strcmp(map->supply, supply) == 0) 1170 return map->regulator; 1171 } 1172 1173 1174 return NULL; 1175} 1176 1177/* Internal regulator request function */ 1178static struct regulator *_regulator_get(struct device *dev, const char *id, 1179 int exclusive) 1180{ 1181 struct regulator_dev *rdev; 1182 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1183 const char *devname = NULL; 1184 int ret; 1185 1186 if (id == NULL) { 1187 pr_err("get() with no identifier\n"); 1188 return regulator; 1189 } 1190 1191 if (dev) 1192 devname = dev_name(dev); 1193 1194 mutex_lock(®ulator_list_mutex); 1195 1196 rdev = regulator_dev_lookup(dev, id, &ret); 1197 if (rdev) 1198 goto found; 1199 1200 if (board_wants_dummy_regulator) { 1201 rdev = dummy_regulator_rdev; 1202 goto found; 1203 } 1204 1205#ifdef CONFIG_REGULATOR_DUMMY 1206 if (!devname) 1207 devname = "deviceless"; 1208 1209 /* If the board didn't flag that it was fully constrained then 1210 * substitute in a dummy regulator so consumers can continue. 1211 */ 1212 if (!has_full_constraints) { 1213 pr_warn("%s supply %s not found, using dummy regulator\n", 1214 devname, id); 1215 rdev = dummy_regulator_rdev; 1216 goto found; 1217 } 1218#endif 1219 1220 mutex_unlock(®ulator_list_mutex); 1221 return regulator; 1222 1223found: 1224 if (rdev->exclusive) { 1225 regulator = ERR_PTR(-EPERM); 1226 goto out; 1227 } 1228 1229 if (exclusive && rdev->open_count) { 1230 regulator = ERR_PTR(-EBUSY); 1231 goto out; 1232 } 1233 1234 if (!try_module_get(rdev->owner)) 1235 goto out; 1236 1237 regulator = create_regulator(rdev, dev, id); 1238 if (regulator == NULL) { 1239 regulator = ERR_PTR(-ENOMEM); 1240 module_put(rdev->owner); 1241 goto out; 1242 } 1243 1244 rdev->open_count++; 1245 if (exclusive) { 1246 rdev->exclusive = 1; 1247 1248 ret = _regulator_is_enabled(rdev); 1249 if (ret > 0) 1250 rdev->use_count = 1; 1251 else 1252 rdev->use_count = 0; 1253 } 1254 1255out: 1256 mutex_unlock(®ulator_list_mutex); 1257 1258 return regulator; 1259} 1260 1261/** 1262 * regulator_get - lookup and obtain a reference to a regulator. 1263 * @dev: device for regulator "consumer" 1264 * @id: Supply name or regulator ID. 1265 * 1266 * Returns a struct regulator corresponding to the regulator producer, 1267 * or IS_ERR() condition containing errno. 1268 * 1269 * Use of supply names configured via regulator_set_device_supply() is 1270 * strongly encouraged. It is recommended that the supply name used 1271 * should match the name used for the supply and/or the relevant 1272 * device pins in the datasheet. 1273 */ 1274struct regulator *regulator_get(struct device *dev, const char *id) 1275{ 1276 return _regulator_get(dev, id, 0); 1277} 1278EXPORT_SYMBOL_GPL(regulator_get); 1279 1280static void devm_regulator_release(struct device *dev, void *res) 1281{ 1282 regulator_put(*(struct regulator **)res); 1283} 1284 1285/** 1286 * devm_regulator_get - Resource managed regulator_get() 1287 * @dev: device for regulator "consumer" 1288 * @id: Supply name or regulator ID. 1289 * 1290 * Managed regulator_get(). Regulators returned from this function are 1291 * automatically regulator_put() on driver detach. See regulator_get() for more 1292 * information. 1293 */ 1294struct regulator *devm_regulator_get(struct device *dev, const char *id) 1295{ 1296 struct regulator **ptr, *regulator; 1297 1298 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1299 if (!ptr) 1300 return ERR_PTR(-ENOMEM); 1301 1302 regulator = regulator_get(dev, id); 1303 if (!IS_ERR(regulator)) { 1304 *ptr = regulator; 1305 devres_add(dev, ptr); 1306 } else { 1307 devres_free(ptr); 1308 } 1309 1310 return regulator; 1311} 1312EXPORT_SYMBOL_GPL(devm_regulator_get); 1313 1314/** 1315 * regulator_get_exclusive - obtain exclusive access to a regulator. 1316 * @dev: device for regulator "consumer" 1317 * @id: Supply name or regulator ID. 1318 * 1319 * Returns a struct regulator corresponding to the regulator producer, 1320 * or IS_ERR() condition containing errno. Other consumers will be 1321 * unable to obtain this reference is held and the use count for the 1322 * regulator will be initialised to reflect the current state of the 1323 * regulator. 1324 * 1325 * This is intended for use by consumers which cannot tolerate shared 1326 * use of the regulator such as those which need to force the 1327 * regulator off for correct operation of the hardware they are 1328 * controlling. 1329 * 1330 * Use of supply names configured via regulator_set_device_supply() is 1331 * strongly encouraged. It is recommended that the supply name used 1332 * should match the name used for the supply and/or the relevant 1333 * device pins in the datasheet. 1334 */ 1335struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1336{ 1337 return _regulator_get(dev, id, 1); 1338} 1339EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1340 1341/** 1342 * regulator_put - "free" the regulator source 1343 * @regulator: regulator source 1344 * 1345 * Note: drivers must ensure that all regulator_enable calls made on this 1346 * regulator source are balanced by regulator_disable calls prior to calling 1347 * this function. 1348 */ 1349void regulator_put(struct regulator *regulator) 1350{ 1351 struct regulator_dev *rdev; 1352 1353 if (regulator == NULL || IS_ERR(regulator)) 1354 return; 1355 1356 mutex_lock(®ulator_list_mutex); 1357 rdev = regulator->rdev; 1358 1359 debugfs_remove_recursive(regulator->debugfs); 1360 1361 /* remove any sysfs entries */ 1362 if (regulator->dev) { 1363 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1364 device_remove_file(regulator->dev, ®ulator->dev_attr); 1365 kfree(regulator->dev_attr.attr.name); 1366 } 1367 kfree(regulator->supply_name); 1368 list_del(®ulator->list); 1369 kfree(regulator); 1370 1371 rdev->open_count--; 1372 rdev->exclusive = 0; 1373 1374 module_put(rdev->owner); 1375 mutex_unlock(®ulator_list_mutex); 1376} 1377EXPORT_SYMBOL_GPL(regulator_put); 1378 1379static int devm_regulator_match(struct device *dev, void *res, void *data) 1380{ 1381 struct regulator **r = res; 1382 if (!r || !*r) { 1383 WARN_ON(!r || !*r); 1384 return 0; 1385 } 1386 return *r == data; 1387} 1388 1389/** 1390 * devm_regulator_put - Resource managed regulator_put() 1391 * @regulator: regulator to free 1392 * 1393 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1394 * this function will not need to be called and the resource management 1395 * code will ensure that the resource is freed. 1396 */ 1397void devm_regulator_put(struct regulator *regulator) 1398{ 1399 int rc; 1400 1401 rc = devres_release(regulator->dev, devm_regulator_release, 1402 devm_regulator_match, regulator); 1403 if (rc != 0) 1404 WARN_ON(rc); 1405} 1406EXPORT_SYMBOL_GPL(devm_regulator_put); 1407 1408/* locks held by regulator_enable() */ 1409static int _regulator_enable(struct regulator_dev *rdev) 1410{ 1411 int ret, delay; 1412 1413 /* check voltage and requested load before enabling */ 1414 if (rdev->constraints && 1415 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1416 drms_uA_update(rdev); 1417 1418 if (rdev->use_count == 0) { 1419 /* The regulator may on if it's not switchable or left on */ 1420 ret = _regulator_is_enabled(rdev); 1421 if (ret == -EINVAL || ret == 0) { 1422 if (!_regulator_can_change_status(rdev)) 1423 return -EPERM; 1424 1425 if (!rdev->desc->ops->enable) 1426 return -EINVAL; 1427 1428 /* Query before enabling in case configuration 1429 * dependent. */ 1430 ret = _regulator_get_enable_time(rdev); 1431 if (ret >= 0) { 1432 delay = ret; 1433 } else { 1434 rdev_warn(rdev, "enable_time() failed: %d\n", 1435 ret); 1436 delay = 0; 1437 } 1438 1439 trace_regulator_enable(rdev_get_name(rdev)); 1440 1441 /* Allow the regulator to ramp; it would be useful 1442 * to extend this for bulk operations so that the 1443 * regulators can ramp together. */ 1444 ret = rdev->desc->ops->enable(rdev); 1445 if (ret < 0) 1446 return ret; 1447 1448 trace_regulator_enable_delay(rdev_get_name(rdev)); 1449 1450 if (delay >= 1000) { 1451 mdelay(delay / 1000); 1452 udelay(delay % 1000); 1453 } else if (delay) { 1454 udelay(delay); 1455 } 1456 1457 trace_regulator_enable_complete(rdev_get_name(rdev)); 1458 1459 } else if (ret < 0) { 1460 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1461 return ret; 1462 } 1463 /* Fallthrough on positive return values - already enabled */ 1464 } 1465 1466 rdev->use_count++; 1467 1468 return 0; 1469} 1470 1471/** 1472 * regulator_enable - enable regulator output 1473 * @regulator: regulator source 1474 * 1475 * Request that the regulator be enabled with the regulator output at 1476 * the predefined voltage or current value. Calls to regulator_enable() 1477 * must be balanced with calls to regulator_disable(). 1478 * 1479 * NOTE: the output value can be set by other drivers, boot loader or may be 1480 * hardwired in the regulator. 1481 */ 1482int regulator_enable(struct regulator *regulator) 1483{ 1484 struct regulator_dev *rdev = regulator->rdev; 1485 int ret = 0; 1486 1487 if (regulator->always_on) 1488 return 0; 1489 1490 if (rdev->supply) { 1491 ret = regulator_enable(rdev->supply); 1492 if (ret != 0) 1493 return ret; 1494 } 1495 1496 mutex_lock(&rdev->mutex); 1497 ret = _regulator_enable(rdev); 1498 mutex_unlock(&rdev->mutex); 1499 1500 if (ret != 0 && rdev->supply) 1501 regulator_disable(rdev->supply); 1502 1503 return ret; 1504} 1505EXPORT_SYMBOL_GPL(regulator_enable); 1506 1507/* locks held by regulator_disable() */ 1508static int _regulator_disable(struct regulator_dev *rdev) 1509{ 1510 int ret = 0; 1511 1512 if (WARN(rdev->use_count <= 0, 1513 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1514 return -EIO; 1515 1516 /* are we the last user and permitted to disable ? */ 1517 if (rdev->use_count == 1 && 1518 (rdev->constraints && !rdev->constraints->always_on)) { 1519 1520 /* we are last user */ 1521 if (_regulator_can_change_status(rdev) && 1522 rdev->desc->ops->disable) { 1523 trace_regulator_disable(rdev_get_name(rdev)); 1524 1525 ret = rdev->desc->ops->disable(rdev); 1526 if (ret < 0) { 1527 rdev_err(rdev, "failed to disable\n"); 1528 return ret; 1529 } 1530 1531 trace_regulator_disable_complete(rdev_get_name(rdev)); 1532 1533 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1534 NULL); 1535 } 1536 1537 rdev->use_count = 0; 1538 } else if (rdev->use_count > 1) { 1539 1540 if (rdev->constraints && 1541 (rdev->constraints->valid_ops_mask & 1542 REGULATOR_CHANGE_DRMS)) 1543 drms_uA_update(rdev); 1544 1545 rdev->use_count--; 1546 } 1547 1548 return ret; 1549} 1550 1551/** 1552 * regulator_disable - disable regulator output 1553 * @regulator: regulator source 1554 * 1555 * Disable the regulator output voltage or current. Calls to 1556 * regulator_enable() must be balanced with calls to 1557 * regulator_disable(). 1558 * 1559 * NOTE: this will only disable the regulator output if no other consumer 1560 * devices have it enabled, the regulator device supports disabling and 1561 * machine constraints permit this operation. 1562 */ 1563int regulator_disable(struct regulator *regulator) 1564{ 1565 struct regulator_dev *rdev = regulator->rdev; 1566 int ret = 0; 1567 1568 if (regulator->always_on) 1569 return 0; 1570 1571 mutex_lock(&rdev->mutex); 1572 ret = _regulator_disable(rdev); 1573 mutex_unlock(&rdev->mutex); 1574 1575 if (ret == 0 && rdev->supply) 1576 regulator_disable(rdev->supply); 1577 1578 return ret; 1579} 1580EXPORT_SYMBOL_GPL(regulator_disable); 1581 1582/* locks held by regulator_force_disable() */ 1583static int _regulator_force_disable(struct regulator_dev *rdev) 1584{ 1585 int ret = 0; 1586 1587 /* force disable */ 1588 if (rdev->desc->ops->disable) { 1589 /* ah well, who wants to live forever... */ 1590 ret = rdev->desc->ops->disable(rdev); 1591 if (ret < 0) { 1592 rdev_err(rdev, "failed to force disable\n"); 1593 return ret; 1594 } 1595 /* notify other consumers that power has been forced off */ 1596 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1597 REGULATOR_EVENT_DISABLE, NULL); 1598 } 1599 1600 return ret; 1601} 1602 1603/** 1604 * regulator_force_disable - force disable regulator output 1605 * @regulator: regulator source 1606 * 1607 * Forcibly disable the regulator output voltage or current. 1608 * NOTE: this *will* disable the regulator output even if other consumer 1609 * devices have it enabled. This should be used for situations when device 1610 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1611 */ 1612int regulator_force_disable(struct regulator *regulator) 1613{ 1614 struct regulator_dev *rdev = regulator->rdev; 1615 int ret; 1616 1617 mutex_lock(&rdev->mutex); 1618 regulator->uA_load = 0; 1619 ret = _regulator_force_disable(regulator->rdev); 1620 mutex_unlock(&rdev->mutex); 1621 1622 if (rdev->supply) 1623 while (rdev->open_count--) 1624 regulator_disable(rdev->supply); 1625 1626 return ret; 1627} 1628EXPORT_SYMBOL_GPL(regulator_force_disable); 1629 1630static void regulator_disable_work(struct work_struct *work) 1631{ 1632 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1633 disable_work.work); 1634 int count, i, ret; 1635 1636 mutex_lock(&rdev->mutex); 1637 1638 BUG_ON(!rdev->deferred_disables); 1639 1640 count = rdev->deferred_disables; 1641 rdev->deferred_disables = 0; 1642 1643 for (i = 0; i < count; i++) { 1644 ret = _regulator_disable(rdev); 1645 if (ret != 0) 1646 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1647 } 1648 1649 mutex_unlock(&rdev->mutex); 1650 1651 if (rdev->supply) { 1652 for (i = 0; i < count; i++) { 1653 ret = regulator_disable(rdev->supply); 1654 if (ret != 0) { 1655 rdev_err(rdev, 1656 "Supply disable failed: %d\n", ret); 1657 } 1658 } 1659 } 1660} 1661 1662/** 1663 * regulator_disable_deferred - disable regulator output with delay 1664 * @regulator: regulator source 1665 * @ms: miliseconds until the regulator is disabled 1666 * 1667 * Execute regulator_disable() on the regulator after a delay. This 1668 * is intended for use with devices that require some time to quiesce. 1669 * 1670 * NOTE: this will only disable the regulator output if no other consumer 1671 * devices have it enabled, the regulator device supports disabling and 1672 * machine constraints permit this operation. 1673 */ 1674int regulator_disable_deferred(struct regulator *regulator, int ms) 1675{ 1676 struct regulator_dev *rdev = regulator->rdev; 1677 int ret; 1678 1679 if (regulator->always_on) 1680 return 0; 1681 1682 mutex_lock(&rdev->mutex); 1683 rdev->deferred_disables++; 1684 mutex_unlock(&rdev->mutex); 1685 1686 ret = schedule_delayed_work(&rdev->disable_work, 1687 msecs_to_jiffies(ms)); 1688 if (ret < 0) 1689 return ret; 1690 else 1691 return 0; 1692} 1693EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1694 1695/** 1696 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1697 * 1698 * @rdev: regulator to operate on 1699 * 1700 * Regulators that use regmap for their register I/O can set the 1701 * enable_reg and enable_mask fields in their descriptor and then use 1702 * this as their is_enabled operation, saving some code. 1703 */ 1704int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1705{ 1706 unsigned int val; 1707 int ret; 1708 1709 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1710 if (ret != 0) 1711 return ret; 1712 1713 return (val & rdev->desc->enable_mask) != 0; 1714} 1715EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1716 1717/** 1718 * regulator_enable_regmap - standard enable() for regmap users 1719 * 1720 * @rdev: regulator to operate on 1721 * 1722 * Regulators that use regmap for their register I/O can set the 1723 * enable_reg and enable_mask fields in their descriptor and then use 1724 * this as their enable() operation, saving some code. 1725 */ 1726int regulator_enable_regmap(struct regulator_dev *rdev) 1727{ 1728 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1729 rdev->desc->enable_mask, 1730 rdev->desc->enable_mask); 1731} 1732EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1733 1734/** 1735 * regulator_disable_regmap - standard disable() for regmap users 1736 * 1737 * @rdev: regulator to operate on 1738 * 1739 * Regulators that use regmap for their register I/O can set the 1740 * enable_reg and enable_mask fields in their descriptor and then use 1741 * this as their disable() operation, saving some code. 1742 */ 1743int regulator_disable_regmap(struct regulator_dev *rdev) 1744{ 1745 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1746 rdev->desc->enable_mask, 0); 1747} 1748EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1749 1750static int _regulator_is_enabled(struct regulator_dev *rdev) 1751{ 1752 /* If we don't know then assume that the regulator is always on */ 1753 if (!rdev->desc->ops->is_enabled) 1754 return 1; 1755 1756 return rdev->desc->ops->is_enabled(rdev); 1757} 1758 1759/** 1760 * regulator_is_enabled - is the regulator output enabled 1761 * @regulator: regulator source 1762 * 1763 * Returns positive if the regulator driver backing the source/client 1764 * has requested that the device be enabled, zero if it hasn't, else a 1765 * negative errno code. 1766 * 1767 * Note that the device backing this regulator handle can have multiple 1768 * users, so it might be enabled even if regulator_enable() was never 1769 * called for this particular source. 1770 */ 1771int regulator_is_enabled(struct regulator *regulator) 1772{ 1773 int ret; 1774 1775 if (regulator->always_on) 1776 return 1; 1777 1778 mutex_lock(®ulator->rdev->mutex); 1779 ret = _regulator_is_enabled(regulator->rdev); 1780 mutex_unlock(®ulator->rdev->mutex); 1781 1782 return ret; 1783} 1784EXPORT_SYMBOL_GPL(regulator_is_enabled); 1785 1786/** 1787 * regulator_count_voltages - count regulator_list_voltage() selectors 1788 * @regulator: regulator source 1789 * 1790 * Returns number of selectors, or negative errno. Selectors are 1791 * numbered starting at zero, and typically correspond to bitfields 1792 * in hardware registers. 1793 */ 1794int regulator_count_voltages(struct regulator *regulator) 1795{ 1796 struct regulator_dev *rdev = regulator->rdev; 1797 1798 return rdev->desc->n_voltages ? : -EINVAL; 1799} 1800EXPORT_SYMBOL_GPL(regulator_count_voltages); 1801 1802/** 1803 * regulator_list_voltage_linear - List voltages with simple calculation 1804 * 1805 * @rdev: Regulator device 1806 * @selector: Selector to convert into a voltage 1807 * 1808 * Regulators with a simple linear mapping between voltages and 1809 * selectors can set min_uV and uV_step in the regulator descriptor 1810 * and then use this function as their list_voltage() operation, 1811 */ 1812int regulator_list_voltage_linear(struct regulator_dev *rdev, 1813 unsigned int selector) 1814{ 1815 if (selector >= rdev->desc->n_voltages) 1816 return -EINVAL; 1817 1818 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1819} 1820EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1821 1822/** 1823 * regulator_list_voltage_table - List voltages with table based mapping 1824 * 1825 * @rdev: Regulator device 1826 * @selector: Selector to convert into a voltage 1827 * 1828 * Regulators with table based mapping between voltages and 1829 * selectors can set volt_table in the regulator descriptor 1830 * and then use this function as their list_voltage() operation. 1831 */ 1832int regulator_list_voltage_table(struct regulator_dev *rdev, 1833 unsigned int selector) 1834{ 1835 if (!rdev->desc->volt_table) { 1836 BUG_ON(!rdev->desc->volt_table); 1837 return -EINVAL; 1838 } 1839 1840 if (selector >= rdev->desc->n_voltages) 1841 return -EINVAL; 1842 1843 return rdev->desc->volt_table[selector]; 1844} 1845EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1846 1847/** 1848 * regulator_list_voltage - enumerate supported voltages 1849 * @regulator: regulator source 1850 * @selector: identify voltage to list 1851 * Context: can sleep 1852 * 1853 * Returns a voltage that can be passed to @regulator_set_voltage(), 1854 * zero if this selector code can't be used on this system, or a 1855 * negative errno. 1856 */ 1857int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1858{ 1859 struct regulator_dev *rdev = regulator->rdev; 1860 struct regulator_ops *ops = rdev->desc->ops; 1861 int ret; 1862 1863 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1864 return -EINVAL; 1865 1866 mutex_lock(&rdev->mutex); 1867 ret = ops->list_voltage(rdev, selector); 1868 mutex_unlock(&rdev->mutex); 1869 1870 if (ret > 0) { 1871 if (ret < rdev->constraints->min_uV) 1872 ret = 0; 1873 else if (ret > rdev->constraints->max_uV) 1874 ret = 0; 1875 } 1876 1877 return ret; 1878} 1879EXPORT_SYMBOL_GPL(regulator_list_voltage); 1880 1881/** 1882 * regulator_is_supported_voltage - check if a voltage range can be supported 1883 * 1884 * @regulator: Regulator to check. 1885 * @min_uV: Minimum required voltage in uV. 1886 * @max_uV: Maximum required voltage in uV. 1887 * 1888 * Returns a boolean or a negative error code. 1889 */ 1890int regulator_is_supported_voltage(struct regulator *regulator, 1891 int min_uV, int max_uV) 1892{ 1893 int i, voltages, ret; 1894 1895 ret = regulator_count_voltages(regulator); 1896 if (ret < 0) 1897 return ret; 1898 voltages = ret; 1899 1900 for (i = 0; i < voltages; i++) { 1901 ret = regulator_list_voltage(regulator, i); 1902 1903 if (ret >= min_uV && ret <= max_uV) 1904 return 1; 1905 } 1906 1907 return 0; 1908} 1909EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1910 1911/** 1912 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1913 * 1914 * @rdev: regulator to operate on 1915 * 1916 * Regulators that use regmap for their register I/O can set the 1917 * vsel_reg and vsel_mask fields in their descriptor and then use this 1918 * as their get_voltage_vsel operation, saving some code. 1919 */ 1920int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1921{ 1922 unsigned int val; 1923 int ret; 1924 1925 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1926 if (ret != 0) 1927 return ret; 1928 1929 val &= rdev->desc->vsel_mask; 1930 val >>= ffs(rdev->desc->vsel_mask) - 1; 1931 1932 return val; 1933} 1934EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1935 1936/** 1937 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1938 * 1939 * @rdev: regulator to operate on 1940 * @sel: Selector to set 1941 * 1942 * Regulators that use regmap for their register I/O can set the 1943 * vsel_reg and vsel_mask fields in their descriptor and then use this 1944 * as their set_voltage_vsel operation, saving some code. 1945 */ 1946int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 1947{ 1948 sel <<= ffs(rdev->desc->vsel_mask) - 1; 1949 1950 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 1951 rdev->desc->vsel_mask, sel); 1952} 1953EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 1954 1955/** 1956 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 1957 * 1958 * @rdev: Regulator to operate on 1959 * @min_uV: Lower bound for voltage 1960 * @max_uV: Upper bound for voltage 1961 * 1962 * Drivers implementing set_voltage_sel() and list_voltage() can use 1963 * this as their map_voltage() operation. It will find a suitable 1964 * voltage by calling list_voltage() until it gets something in bounds 1965 * for the requested voltages. 1966 */ 1967int regulator_map_voltage_iterate(struct regulator_dev *rdev, 1968 int min_uV, int max_uV) 1969{ 1970 int best_val = INT_MAX; 1971 int selector = 0; 1972 int i, ret; 1973 1974 /* Find the smallest voltage that falls within the specified 1975 * range. 1976 */ 1977 for (i = 0; i < rdev->desc->n_voltages; i++) { 1978 ret = rdev->desc->ops->list_voltage(rdev, i); 1979 if (ret < 0) 1980 continue; 1981 1982 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1983 best_val = ret; 1984 selector = i; 1985 } 1986 } 1987 1988 if (best_val != INT_MAX) 1989 return selector; 1990 else 1991 return -EINVAL; 1992} 1993EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 1994 1995/** 1996 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 1997 * 1998 * @rdev: Regulator to operate on 1999 * @min_uV: Lower bound for voltage 2000 * @max_uV: Upper bound for voltage 2001 * 2002 * Drivers providing min_uV and uV_step in their regulator_desc can 2003 * use this as their map_voltage() operation. 2004 */ 2005int regulator_map_voltage_linear(struct regulator_dev *rdev, 2006 int min_uV, int max_uV) 2007{ 2008 int ret, voltage; 2009 2010 if (!rdev->desc->uV_step) { 2011 BUG_ON(!rdev->desc->uV_step); 2012 return -EINVAL; 2013 } 2014 2015 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2016 if (ret < 0) 2017 return ret; 2018 2019 /* Map back into a voltage to verify we're still in bounds */ 2020 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2021 if (voltage < min_uV || voltage > max_uV) 2022 return -EINVAL; 2023 2024 return ret; 2025} 2026EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2027 2028static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2029 int min_uV, int max_uV) 2030{ 2031 int ret; 2032 int delay = 0; 2033 int best_val; 2034 unsigned int selector; 2035 int old_selector = -1; 2036 2037 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2038 2039 min_uV += rdev->constraints->uV_offset; 2040 max_uV += rdev->constraints->uV_offset; 2041 2042 /* 2043 * If we can't obtain the old selector there is not enough 2044 * info to call set_voltage_time_sel(). 2045 */ 2046 if (_regulator_is_enabled(rdev) && 2047 rdev->desc->ops->set_voltage_time_sel && 2048 rdev->desc->ops->get_voltage_sel) { 2049 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2050 if (old_selector < 0) 2051 return old_selector; 2052 } 2053 2054 if (rdev->desc->ops->set_voltage) { 2055 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2056 &selector); 2057 } else if (rdev->desc->ops->set_voltage_sel) { 2058 if (rdev->desc->ops->map_voltage) { 2059 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2060 max_uV); 2061 } else { 2062 if (rdev->desc->ops->list_voltage == 2063 regulator_list_voltage_linear) 2064 ret = regulator_map_voltage_linear(rdev, 2065 min_uV, max_uV); 2066 else 2067 ret = regulator_map_voltage_iterate(rdev, 2068 min_uV, max_uV); 2069 } 2070 2071 if (ret >= 0) { 2072 selector = ret; 2073 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2074 } 2075 } else { 2076 ret = -EINVAL; 2077 } 2078 2079 if (rdev->desc->ops->list_voltage) 2080 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2081 else 2082 best_val = _regulator_get_voltage(rdev); 2083 2084 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2085 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2086 rdev->desc->ops->set_voltage_time_sel) { 2087 2088 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2089 old_selector, selector); 2090 if (delay < 0) { 2091 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2092 delay); 2093 delay = 0; 2094 } 2095 2096 /* Insert any necessary delays */ 2097 if (delay >= 1000) { 2098 mdelay(delay / 1000); 2099 udelay(delay % 1000); 2100 } else if (delay) { 2101 udelay(delay); 2102 } 2103 } 2104 2105 if (ret == 0 && best_val >= 0) 2106 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2107 (void *)best_val); 2108 2109 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2110 2111 return ret; 2112} 2113 2114/** 2115 * regulator_set_voltage - set regulator output voltage 2116 * @regulator: regulator source 2117 * @min_uV: Minimum required voltage in uV 2118 * @max_uV: Maximum acceptable voltage in uV 2119 * 2120 * Sets a voltage regulator to the desired output voltage. This can be set 2121 * during any regulator state. IOW, regulator can be disabled or enabled. 2122 * 2123 * If the regulator is enabled then the voltage will change to the new value 2124 * immediately otherwise if the regulator is disabled the regulator will 2125 * output at the new voltage when enabled. 2126 * 2127 * NOTE: If the regulator is shared between several devices then the lowest 2128 * request voltage that meets the system constraints will be used. 2129 * Regulator system constraints must be set for this regulator before 2130 * calling this function otherwise this call will fail. 2131 */ 2132int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2133{ 2134 struct regulator_dev *rdev = regulator->rdev; 2135 int ret = 0; 2136 2137 mutex_lock(&rdev->mutex); 2138 2139 /* If we're setting the same range as last time the change 2140 * should be a noop (some cpufreq implementations use the same 2141 * voltage for multiple frequencies, for example). 2142 */ 2143 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2144 goto out; 2145 2146 /* sanity check */ 2147 if (!rdev->desc->ops->set_voltage && 2148 !rdev->desc->ops->set_voltage_sel) { 2149 ret = -EINVAL; 2150 goto out; 2151 } 2152 2153 /* constraints check */ 2154 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2155 if (ret < 0) 2156 goto out; 2157 regulator->min_uV = min_uV; 2158 regulator->max_uV = max_uV; 2159 2160 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2161 if (ret < 0) 2162 goto out; 2163 2164 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2165 2166out: 2167 mutex_unlock(&rdev->mutex); 2168 return ret; 2169} 2170EXPORT_SYMBOL_GPL(regulator_set_voltage); 2171 2172/** 2173 * regulator_set_voltage_time - get raise/fall time 2174 * @regulator: regulator source 2175 * @old_uV: starting voltage in microvolts 2176 * @new_uV: target voltage in microvolts 2177 * 2178 * Provided with the starting and ending voltage, this function attempts to 2179 * calculate the time in microseconds required to rise or fall to this new 2180 * voltage. 2181 */ 2182int regulator_set_voltage_time(struct regulator *regulator, 2183 int old_uV, int new_uV) 2184{ 2185 struct regulator_dev *rdev = regulator->rdev; 2186 struct regulator_ops *ops = rdev->desc->ops; 2187 int old_sel = -1; 2188 int new_sel = -1; 2189 int voltage; 2190 int i; 2191 2192 /* Currently requires operations to do this */ 2193 if (!ops->list_voltage || !ops->set_voltage_time_sel 2194 || !rdev->desc->n_voltages) 2195 return -EINVAL; 2196 2197 for (i = 0; i < rdev->desc->n_voltages; i++) { 2198 /* We only look for exact voltage matches here */ 2199 voltage = regulator_list_voltage(regulator, i); 2200 if (voltage < 0) 2201 return -EINVAL; 2202 if (voltage == 0) 2203 continue; 2204 if (voltage == old_uV) 2205 old_sel = i; 2206 if (voltage == new_uV) 2207 new_sel = i; 2208 } 2209 2210 if (old_sel < 0 || new_sel < 0) 2211 return -EINVAL; 2212 2213 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2214} 2215EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2216 2217/** 2218 * regulator_sync_voltage - re-apply last regulator output voltage 2219 * @regulator: regulator source 2220 * 2221 * Re-apply the last configured voltage. This is intended to be used 2222 * where some external control source the consumer is cooperating with 2223 * has caused the configured voltage to change. 2224 */ 2225int regulator_sync_voltage(struct regulator *regulator) 2226{ 2227 struct regulator_dev *rdev = regulator->rdev; 2228 int ret, min_uV, max_uV; 2229 2230 mutex_lock(&rdev->mutex); 2231 2232 if (!rdev->desc->ops->set_voltage && 2233 !rdev->desc->ops->set_voltage_sel) { 2234 ret = -EINVAL; 2235 goto out; 2236 } 2237 2238 /* This is only going to work if we've had a voltage configured. */ 2239 if (!regulator->min_uV && !regulator->max_uV) { 2240 ret = -EINVAL; 2241 goto out; 2242 } 2243 2244 min_uV = regulator->min_uV; 2245 max_uV = regulator->max_uV; 2246 2247 /* This should be a paranoia check... */ 2248 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2249 if (ret < 0) 2250 goto out; 2251 2252 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2253 if (ret < 0) 2254 goto out; 2255 2256 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2257 2258out: 2259 mutex_unlock(&rdev->mutex); 2260 return ret; 2261} 2262EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2263 2264static int _regulator_get_voltage(struct regulator_dev *rdev) 2265{ 2266 int sel, ret; 2267 2268 if (rdev->desc->ops->get_voltage_sel) { 2269 sel = rdev->desc->ops->get_voltage_sel(rdev); 2270 if (sel < 0) 2271 return sel; 2272 ret = rdev->desc->ops->list_voltage(rdev, sel); 2273 } else if (rdev->desc->ops->get_voltage) { 2274 ret = rdev->desc->ops->get_voltage(rdev); 2275 } else { 2276 return -EINVAL; 2277 } 2278 2279 if (ret < 0) 2280 return ret; 2281 return ret - rdev->constraints->uV_offset; 2282} 2283 2284/** 2285 * regulator_get_voltage - get regulator output voltage 2286 * @regulator: regulator source 2287 * 2288 * This returns the current regulator voltage in uV. 2289 * 2290 * NOTE: If the regulator is disabled it will return the voltage value. This 2291 * function should not be used to determine regulator state. 2292 */ 2293int regulator_get_voltage(struct regulator *regulator) 2294{ 2295 int ret; 2296 2297 mutex_lock(®ulator->rdev->mutex); 2298 2299 ret = _regulator_get_voltage(regulator->rdev); 2300 2301 mutex_unlock(®ulator->rdev->mutex); 2302 2303 return ret; 2304} 2305EXPORT_SYMBOL_GPL(regulator_get_voltage); 2306 2307/** 2308 * regulator_set_current_limit - set regulator output current limit 2309 * @regulator: regulator source 2310 * @min_uA: Minimuum supported current in uA 2311 * @max_uA: Maximum supported current in uA 2312 * 2313 * Sets current sink to the desired output current. This can be set during 2314 * any regulator state. IOW, regulator can be disabled or enabled. 2315 * 2316 * If the regulator is enabled then the current will change to the new value 2317 * immediately otherwise if the regulator is disabled the regulator will 2318 * output at the new current when enabled. 2319 * 2320 * NOTE: Regulator system constraints must be set for this regulator before 2321 * calling this function otherwise this call will fail. 2322 */ 2323int regulator_set_current_limit(struct regulator *regulator, 2324 int min_uA, int max_uA) 2325{ 2326 struct regulator_dev *rdev = regulator->rdev; 2327 int ret; 2328 2329 mutex_lock(&rdev->mutex); 2330 2331 /* sanity check */ 2332 if (!rdev->desc->ops->set_current_limit) { 2333 ret = -EINVAL; 2334 goto out; 2335 } 2336 2337 /* constraints check */ 2338 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2339 if (ret < 0) 2340 goto out; 2341 2342 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2343out: 2344 mutex_unlock(&rdev->mutex); 2345 return ret; 2346} 2347EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2348 2349static int _regulator_get_current_limit(struct regulator_dev *rdev) 2350{ 2351 int ret; 2352 2353 mutex_lock(&rdev->mutex); 2354 2355 /* sanity check */ 2356 if (!rdev->desc->ops->get_current_limit) { 2357 ret = -EINVAL; 2358 goto out; 2359 } 2360 2361 ret = rdev->desc->ops->get_current_limit(rdev); 2362out: 2363 mutex_unlock(&rdev->mutex); 2364 return ret; 2365} 2366 2367/** 2368 * regulator_get_current_limit - get regulator output current 2369 * @regulator: regulator source 2370 * 2371 * This returns the current supplied by the specified current sink in uA. 2372 * 2373 * NOTE: If the regulator is disabled it will return the current value. This 2374 * function should not be used to determine regulator state. 2375 */ 2376int regulator_get_current_limit(struct regulator *regulator) 2377{ 2378 return _regulator_get_current_limit(regulator->rdev); 2379} 2380EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2381 2382/** 2383 * regulator_set_mode - set regulator operating mode 2384 * @regulator: regulator source 2385 * @mode: operating mode - one of the REGULATOR_MODE constants 2386 * 2387 * Set regulator operating mode to increase regulator efficiency or improve 2388 * regulation performance. 2389 * 2390 * NOTE: Regulator system constraints must be set for this regulator before 2391 * calling this function otherwise this call will fail. 2392 */ 2393int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2394{ 2395 struct regulator_dev *rdev = regulator->rdev; 2396 int ret; 2397 int regulator_curr_mode; 2398 2399 mutex_lock(&rdev->mutex); 2400 2401 /* sanity check */ 2402 if (!rdev->desc->ops->set_mode) { 2403 ret = -EINVAL; 2404 goto out; 2405 } 2406 2407 /* return if the same mode is requested */ 2408 if (rdev->desc->ops->get_mode) { 2409 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2410 if (regulator_curr_mode == mode) { 2411 ret = 0; 2412 goto out; 2413 } 2414 } 2415 2416 /* constraints check */ 2417 ret = regulator_mode_constrain(rdev, &mode); 2418 if (ret < 0) 2419 goto out; 2420 2421 ret = rdev->desc->ops->set_mode(rdev, mode); 2422out: 2423 mutex_unlock(&rdev->mutex); 2424 return ret; 2425} 2426EXPORT_SYMBOL_GPL(regulator_set_mode); 2427 2428static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2429{ 2430 int ret; 2431 2432 mutex_lock(&rdev->mutex); 2433 2434 /* sanity check */ 2435 if (!rdev->desc->ops->get_mode) { 2436 ret = -EINVAL; 2437 goto out; 2438 } 2439 2440 ret = rdev->desc->ops->get_mode(rdev); 2441out: 2442 mutex_unlock(&rdev->mutex); 2443 return ret; 2444} 2445 2446/** 2447 * regulator_get_mode - get regulator operating mode 2448 * @regulator: regulator source 2449 * 2450 * Get the current regulator operating mode. 2451 */ 2452unsigned int regulator_get_mode(struct regulator *regulator) 2453{ 2454 return _regulator_get_mode(regulator->rdev); 2455} 2456EXPORT_SYMBOL_GPL(regulator_get_mode); 2457 2458/** 2459 * regulator_set_optimum_mode - set regulator optimum operating mode 2460 * @regulator: regulator source 2461 * @uA_load: load current 2462 * 2463 * Notifies the regulator core of a new device load. This is then used by 2464 * DRMS (if enabled by constraints) to set the most efficient regulator 2465 * operating mode for the new regulator loading. 2466 * 2467 * Consumer devices notify their supply regulator of the maximum power 2468 * they will require (can be taken from device datasheet in the power 2469 * consumption tables) when they change operational status and hence power 2470 * state. Examples of operational state changes that can affect power 2471 * consumption are :- 2472 * 2473 * o Device is opened / closed. 2474 * o Device I/O is about to begin or has just finished. 2475 * o Device is idling in between work. 2476 * 2477 * This information is also exported via sysfs to userspace. 2478 * 2479 * DRMS will sum the total requested load on the regulator and change 2480 * to the most efficient operating mode if platform constraints allow. 2481 * 2482 * Returns the new regulator mode or error. 2483 */ 2484int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2485{ 2486 struct regulator_dev *rdev = regulator->rdev; 2487 struct regulator *consumer; 2488 int ret, output_uV, input_uV, total_uA_load = 0; 2489 unsigned int mode; 2490 2491 mutex_lock(&rdev->mutex); 2492 2493 /* 2494 * first check to see if we can set modes at all, otherwise just 2495 * tell the consumer everything is OK. 2496 */ 2497 regulator->uA_load = uA_load; 2498 ret = regulator_check_drms(rdev); 2499 if (ret < 0) { 2500 ret = 0; 2501 goto out; 2502 } 2503 2504 if (!rdev->desc->ops->get_optimum_mode) 2505 goto out; 2506 2507 /* 2508 * we can actually do this so any errors are indicators of 2509 * potential real failure. 2510 */ 2511 ret = -EINVAL; 2512 2513 if (!rdev->desc->ops->set_mode) 2514 goto out; 2515 2516 /* get output voltage */ 2517 output_uV = _regulator_get_voltage(rdev); 2518 if (output_uV <= 0) { 2519 rdev_err(rdev, "invalid output voltage found\n"); 2520 goto out; 2521 } 2522 2523 /* get input voltage */ 2524 input_uV = 0; 2525 if (rdev->supply) 2526 input_uV = regulator_get_voltage(rdev->supply); 2527 if (input_uV <= 0) 2528 input_uV = rdev->constraints->input_uV; 2529 if (input_uV <= 0) { 2530 rdev_err(rdev, "invalid input voltage found\n"); 2531 goto out; 2532 } 2533 2534 /* calc total requested load for this regulator */ 2535 list_for_each_entry(consumer, &rdev->consumer_list, list) 2536 total_uA_load += consumer->uA_load; 2537 2538 mode = rdev->desc->ops->get_optimum_mode(rdev, 2539 input_uV, output_uV, 2540 total_uA_load); 2541 ret = regulator_mode_constrain(rdev, &mode); 2542 if (ret < 0) { 2543 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2544 total_uA_load, input_uV, output_uV); 2545 goto out; 2546 } 2547 2548 ret = rdev->desc->ops->set_mode(rdev, mode); 2549 if (ret < 0) { 2550 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2551 goto out; 2552 } 2553 ret = mode; 2554out: 2555 mutex_unlock(&rdev->mutex); 2556 return ret; 2557} 2558EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2559 2560/** 2561 * regulator_register_notifier - register regulator event notifier 2562 * @regulator: regulator source 2563 * @nb: notifier block 2564 * 2565 * Register notifier block to receive regulator events. 2566 */ 2567int regulator_register_notifier(struct regulator *regulator, 2568 struct notifier_block *nb) 2569{ 2570 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2571 nb); 2572} 2573EXPORT_SYMBOL_GPL(regulator_register_notifier); 2574 2575/** 2576 * regulator_unregister_notifier - unregister regulator event notifier 2577 * @regulator: regulator source 2578 * @nb: notifier block 2579 * 2580 * Unregister regulator event notifier block. 2581 */ 2582int regulator_unregister_notifier(struct regulator *regulator, 2583 struct notifier_block *nb) 2584{ 2585 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2586 nb); 2587} 2588EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2589 2590/* notify regulator consumers and downstream regulator consumers. 2591 * Note mutex must be held by caller. 2592 */ 2593static void _notifier_call_chain(struct regulator_dev *rdev, 2594 unsigned long event, void *data) 2595{ 2596 /* call rdev chain first */ 2597 blocking_notifier_call_chain(&rdev->notifier, event, data); 2598} 2599 2600/** 2601 * regulator_bulk_get - get multiple regulator consumers 2602 * 2603 * @dev: Device to supply 2604 * @num_consumers: Number of consumers to register 2605 * @consumers: Configuration of consumers; clients are stored here. 2606 * 2607 * @return 0 on success, an errno on failure. 2608 * 2609 * This helper function allows drivers to get several regulator 2610 * consumers in one operation. If any of the regulators cannot be 2611 * acquired then any regulators that were allocated will be freed 2612 * before returning to the caller. 2613 */ 2614int regulator_bulk_get(struct device *dev, int num_consumers, 2615 struct regulator_bulk_data *consumers) 2616{ 2617 int i; 2618 int ret; 2619 2620 for (i = 0; i < num_consumers; i++) 2621 consumers[i].consumer = NULL; 2622 2623 for (i = 0; i < num_consumers; i++) { 2624 consumers[i].consumer = regulator_get(dev, 2625 consumers[i].supply); 2626 if (IS_ERR(consumers[i].consumer)) { 2627 ret = PTR_ERR(consumers[i].consumer); 2628 dev_err(dev, "Failed to get supply '%s': %d\n", 2629 consumers[i].supply, ret); 2630 consumers[i].consumer = NULL; 2631 goto err; 2632 } 2633 } 2634 2635 return 0; 2636 2637err: 2638 while (--i >= 0) 2639 regulator_put(consumers[i].consumer); 2640 2641 return ret; 2642} 2643EXPORT_SYMBOL_GPL(regulator_bulk_get); 2644 2645/** 2646 * devm_regulator_bulk_get - managed get multiple regulator consumers 2647 * 2648 * @dev: Device to supply 2649 * @num_consumers: Number of consumers to register 2650 * @consumers: Configuration of consumers; clients are stored here. 2651 * 2652 * @return 0 on success, an errno on failure. 2653 * 2654 * This helper function allows drivers to get several regulator 2655 * consumers in one operation with management, the regulators will 2656 * automatically be freed when the device is unbound. If any of the 2657 * regulators cannot be acquired then any regulators that were 2658 * allocated will be freed before returning to the caller. 2659 */ 2660int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2661 struct regulator_bulk_data *consumers) 2662{ 2663 int i; 2664 int ret; 2665 2666 for (i = 0; i < num_consumers; i++) 2667 consumers[i].consumer = NULL; 2668 2669 for (i = 0; i < num_consumers; i++) { 2670 consumers[i].consumer = devm_regulator_get(dev, 2671 consumers[i].supply); 2672 if (IS_ERR(consumers[i].consumer)) { 2673 ret = PTR_ERR(consumers[i].consumer); 2674 dev_err(dev, "Failed to get supply '%s': %d\n", 2675 consumers[i].supply, ret); 2676 consumers[i].consumer = NULL; 2677 goto err; 2678 } 2679 } 2680 2681 return 0; 2682 2683err: 2684 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2685 devm_regulator_put(consumers[i].consumer); 2686 2687 return ret; 2688} 2689EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2690 2691static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2692{ 2693 struct regulator_bulk_data *bulk = data; 2694 2695 bulk->ret = regulator_enable(bulk->consumer); 2696} 2697 2698/** 2699 * regulator_bulk_enable - enable multiple regulator consumers 2700 * 2701 * @num_consumers: Number of consumers 2702 * @consumers: Consumer data; clients are stored here. 2703 * @return 0 on success, an errno on failure 2704 * 2705 * This convenience API allows consumers to enable multiple regulator 2706 * clients in a single API call. If any consumers cannot be enabled 2707 * then any others that were enabled will be disabled again prior to 2708 * return. 2709 */ 2710int regulator_bulk_enable(int num_consumers, 2711 struct regulator_bulk_data *consumers) 2712{ 2713 LIST_HEAD(async_domain); 2714 int i; 2715 int ret = 0; 2716 2717 for (i = 0; i < num_consumers; i++) { 2718 if (consumers[i].consumer->always_on) 2719 consumers[i].ret = 0; 2720 else 2721 async_schedule_domain(regulator_bulk_enable_async, 2722 &consumers[i], &async_domain); 2723 } 2724 2725 async_synchronize_full_domain(&async_domain); 2726 2727 /* If any consumer failed we need to unwind any that succeeded */ 2728 for (i = 0; i < num_consumers; i++) { 2729 if (consumers[i].ret != 0) { 2730 ret = consumers[i].ret; 2731 goto err; 2732 } 2733 } 2734 2735 return 0; 2736 2737err: 2738 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2739 while (--i >= 0) 2740 regulator_disable(consumers[i].consumer); 2741 2742 return ret; 2743} 2744EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2745 2746/** 2747 * regulator_bulk_disable - disable multiple regulator consumers 2748 * 2749 * @num_consumers: Number of consumers 2750 * @consumers: Consumer data; clients are stored here. 2751 * @return 0 on success, an errno on failure 2752 * 2753 * This convenience API allows consumers to disable multiple regulator 2754 * clients in a single API call. If any consumers cannot be disabled 2755 * then any others that were disabled will be enabled again prior to 2756 * return. 2757 */ 2758int regulator_bulk_disable(int num_consumers, 2759 struct regulator_bulk_data *consumers) 2760{ 2761 int i; 2762 int ret, r; 2763 2764 for (i = num_consumers - 1; i >= 0; --i) { 2765 ret = regulator_disable(consumers[i].consumer); 2766 if (ret != 0) 2767 goto err; 2768 } 2769 2770 return 0; 2771 2772err: 2773 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2774 for (++i; i < num_consumers; ++i) { 2775 r = regulator_enable(consumers[i].consumer); 2776 if (r != 0) 2777 pr_err("Failed to reename %s: %d\n", 2778 consumers[i].supply, r); 2779 } 2780 2781 return ret; 2782} 2783EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2784 2785/** 2786 * regulator_bulk_force_disable - force disable multiple regulator consumers 2787 * 2788 * @num_consumers: Number of consumers 2789 * @consumers: Consumer data; clients are stored here. 2790 * @return 0 on success, an errno on failure 2791 * 2792 * This convenience API allows consumers to forcibly disable multiple regulator 2793 * clients in a single API call. 2794 * NOTE: This should be used for situations when device damage will 2795 * likely occur if the regulators are not disabled (e.g. over temp). 2796 * Although regulator_force_disable function call for some consumers can 2797 * return error numbers, the function is called for all consumers. 2798 */ 2799int regulator_bulk_force_disable(int num_consumers, 2800 struct regulator_bulk_data *consumers) 2801{ 2802 int i; 2803 int ret; 2804 2805 for (i = 0; i < num_consumers; i++) 2806 consumers[i].ret = 2807 regulator_force_disable(consumers[i].consumer); 2808 2809 for (i = 0; i < num_consumers; i++) { 2810 if (consumers[i].ret != 0) { 2811 ret = consumers[i].ret; 2812 goto out; 2813 } 2814 } 2815 2816 return 0; 2817out: 2818 return ret; 2819} 2820EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2821 2822/** 2823 * regulator_bulk_free - free multiple regulator consumers 2824 * 2825 * @num_consumers: Number of consumers 2826 * @consumers: Consumer data; clients are stored here. 2827 * 2828 * This convenience API allows consumers to free multiple regulator 2829 * clients in a single API call. 2830 */ 2831void regulator_bulk_free(int num_consumers, 2832 struct regulator_bulk_data *consumers) 2833{ 2834 int i; 2835 2836 for (i = 0; i < num_consumers; i++) { 2837 regulator_put(consumers[i].consumer); 2838 consumers[i].consumer = NULL; 2839 } 2840} 2841EXPORT_SYMBOL_GPL(regulator_bulk_free); 2842 2843/** 2844 * regulator_notifier_call_chain - call regulator event notifier 2845 * @rdev: regulator source 2846 * @event: notifier block 2847 * @data: callback-specific data. 2848 * 2849 * Called by regulator drivers to notify clients a regulator event has 2850 * occurred. We also notify regulator clients downstream. 2851 * Note lock must be held by caller. 2852 */ 2853int regulator_notifier_call_chain(struct regulator_dev *rdev, 2854 unsigned long event, void *data) 2855{ 2856 _notifier_call_chain(rdev, event, data); 2857 return NOTIFY_DONE; 2858 2859} 2860EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2861 2862/** 2863 * regulator_mode_to_status - convert a regulator mode into a status 2864 * 2865 * @mode: Mode to convert 2866 * 2867 * Convert a regulator mode into a status. 2868 */ 2869int regulator_mode_to_status(unsigned int mode) 2870{ 2871 switch (mode) { 2872 case REGULATOR_MODE_FAST: 2873 return REGULATOR_STATUS_FAST; 2874 case REGULATOR_MODE_NORMAL: 2875 return REGULATOR_STATUS_NORMAL; 2876 case REGULATOR_MODE_IDLE: 2877 return REGULATOR_STATUS_IDLE; 2878 case REGULATOR_STATUS_STANDBY: 2879 return REGULATOR_STATUS_STANDBY; 2880 default: 2881 return 0; 2882 } 2883} 2884EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2885 2886/* 2887 * To avoid cluttering sysfs (and memory) with useless state, only 2888 * create attributes that can be meaningfully displayed. 2889 */ 2890static int add_regulator_attributes(struct regulator_dev *rdev) 2891{ 2892 struct device *dev = &rdev->dev; 2893 struct regulator_ops *ops = rdev->desc->ops; 2894 int status = 0; 2895 2896 /* some attributes need specific methods to be displayed */ 2897 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2898 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2899 status = device_create_file(dev, &dev_attr_microvolts); 2900 if (status < 0) 2901 return status; 2902 } 2903 if (ops->get_current_limit) { 2904 status = device_create_file(dev, &dev_attr_microamps); 2905 if (status < 0) 2906 return status; 2907 } 2908 if (ops->get_mode) { 2909 status = device_create_file(dev, &dev_attr_opmode); 2910 if (status < 0) 2911 return status; 2912 } 2913 if (ops->is_enabled) { 2914 status = device_create_file(dev, &dev_attr_state); 2915 if (status < 0) 2916 return status; 2917 } 2918 if (ops->get_status) { 2919 status = device_create_file(dev, &dev_attr_status); 2920 if (status < 0) 2921 return status; 2922 } 2923 2924 /* some attributes are type-specific */ 2925 if (rdev->desc->type == REGULATOR_CURRENT) { 2926 status = device_create_file(dev, &dev_attr_requested_microamps); 2927 if (status < 0) 2928 return status; 2929 } 2930 2931 /* all the other attributes exist to support constraints; 2932 * don't show them if there are no constraints, or if the 2933 * relevant supporting methods are missing. 2934 */ 2935 if (!rdev->constraints) 2936 return status; 2937 2938 /* constraints need specific supporting methods */ 2939 if (ops->set_voltage || ops->set_voltage_sel) { 2940 status = device_create_file(dev, &dev_attr_min_microvolts); 2941 if (status < 0) 2942 return status; 2943 status = device_create_file(dev, &dev_attr_max_microvolts); 2944 if (status < 0) 2945 return status; 2946 } 2947 if (ops->set_current_limit) { 2948 status = device_create_file(dev, &dev_attr_min_microamps); 2949 if (status < 0) 2950 return status; 2951 status = device_create_file(dev, &dev_attr_max_microamps); 2952 if (status < 0) 2953 return status; 2954 } 2955 2956 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2957 if (status < 0) 2958 return status; 2959 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2960 if (status < 0) 2961 return status; 2962 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2963 if (status < 0) 2964 return status; 2965 2966 if (ops->set_suspend_voltage) { 2967 status = device_create_file(dev, 2968 &dev_attr_suspend_standby_microvolts); 2969 if (status < 0) 2970 return status; 2971 status = device_create_file(dev, 2972 &dev_attr_suspend_mem_microvolts); 2973 if (status < 0) 2974 return status; 2975 status = device_create_file(dev, 2976 &dev_attr_suspend_disk_microvolts); 2977 if (status < 0) 2978 return status; 2979 } 2980 2981 if (ops->set_suspend_mode) { 2982 status = device_create_file(dev, 2983 &dev_attr_suspend_standby_mode); 2984 if (status < 0) 2985 return status; 2986 status = device_create_file(dev, 2987 &dev_attr_suspend_mem_mode); 2988 if (status < 0) 2989 return status; 2990 status = device_create_file(dev, 2991 &dev_attr_suspend_disk_mode); 2992 if (status < 0) 2993 return status; 2994 } 2995 2996 return status; 2997} 2998 2999static void rdev_init_debugfs(struct regulator_dev *rdev) 3000{ 3001 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3002 if (!rdev->debugfs) { 3003 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3004 return; 3005 } 3006 3007 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3008 &rdev->use_count); 3009 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3010 &rdev->open_count); 3011} 3012 3013/** 3014 * regulator_register - register regulator 3015 * @regulator_desc: regulator to register 3016 * @config: runtime configuration for regulator 3017 * 3018 * Called by regulator drivers to register a regulator. 3019 * Returns 0 on success. 3020 */ 3021struct regulator_dev * 3022regulator_register(const struct regulator_desc *regulator_desc, 3023 const struct regulator_config *config) 3024{ 3025 const struct regulation_constraints *constraints = NULL; 3026 const struct regulator_init_data *init_data; 3027 static atomic_t regulator_no = ATOMIC_INIT(0); 3028 struct regulator_dev *rdev; 3029 struct device *dev; 3030 int ret, i; 3031 const char *supply = NULL; 3032 3033 if (regulator_desc == NULL || config == NULL) 3034 return ERR_PTR(-EINVAL); 3035 3036 dev = config->dev; 3037 WARN_ON(!dev); 3038 3039 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3040 return ERR_PTR(-EINVAL); 3041 3042 if (regulator_desc->type != REGULATOR_VOLTAGE && 3043 regulator_desc->type != REGULATOR_CURRENT) 3044 return ERR_PTR(-EINVAL); 3045 3046 /* Only one of each should be implemented */ 3047 WARN_ON(regulator_desc->ops->get_voltage && 3048 regulator_desc->ops->get_voltage_sel); 3049 WARN_ON(regulator_desc->ops->set_voltage && 3050 regulator_desc->ops->set_voltage_sel); 3051 3052 /* If we're using selectors we must implement list_voltage. */ 3053 if (regulator_desc->ops->get_voltage_sel && 3054 !regulator_desc->ops->list_voltage) { 3055 return ERR_PTR(-EINVAL); 3056 } 3057 if (regulator_desc->ops->set_voltage_sel && 3058 !regulator_desc->ops->list_voltage) { 3059 return ERR_PTR(-EINVAL); 3060 } 3061 3062 init_data = config->init_data; 3063 3064 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3065 if (rdev == NULL) 3066 return ERR_PTR(-ENOMEM); 3067 3068 mutex_lock(®ulator_list_mutex); 3069 3070 mutex_init(&rdev->mutex); 3071 rdev->reg_data = config->driver_data; 3072 rdev->owner = regulator_desc->owner; 3073 rdev->desc = regulator_desc; 3074 if (config->regmap) 3075 rdev->regmap = config->regmap; 3076 else 3077 rdev->regmap = dev_get_regmap(dev, NULL); 3078 INIT_LIST_HEAD(&rdev->consumer_list); 3079 INIT_LIST_HEAD(&rdev->list); 3080 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3081 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3082 3083 /* preform any regulator specific init */ 3084 if (init_data && init_data->regulator_init) { 3085 ret = init_data->regulator_init(rdev->reg_data); 3086 if (ret < 0) 3087 goto clean; 3088 } 3089 3090 /* register with sysfs */ 3091 rdev->dev.class = ®ulator_class; 3092 rdev->dev.of_node = config->of_node; 3093 rdev->dev.parent = dev; 3094 dev_set_name(&rdev->dev, "regulator.%d", 3095 atomic_inc_return(®ulator_no) - 1); 3096 ret = device_register(&rdev->dev); 3097 if (ret != 0) { 3098 put_device(&rdev->dev); 3099 goto clean; 3100 } 3101 3102 dev_set_drvdata(&rdev->dev, rdev); 3103 3104 /* set regulator constraints */ 3105 if (init_data) 3106 constraints = &init_data->constraints; 3107 3108 ret = set_machine_constraints(rdev, constraints); 3109 if (ret < 0) 3110 goto scrub; 3111 3112 /* add attributes supported by this regulator */ 3113 ret = add_regulator_attributes(rdev); 3114 if (ret < 0) 3115 goto scrub; 3116 3117 if (init_data && init_data->supply_regulator) 3118 supply = init_data->supply_regulator; 3119 else if (regulator_desc->supply_name) 3120 supply = regulator_desc->supply_name; 3121 3122 if (supply) { 3123 struct regulator_dev *r; 3124 3125 r = regulator_dev_lookup(dev, supply, &ret); 3126 3127 if (!r) { 3128 dev_err(dev, "Failed to find supply %s\n", supply); 3129 ret = -EPROBE_DEFER; 3130 goto scrub; 3131 } 3132 3133 ret = set_supply(rdev, r); 3134 if (ret < 0) 3135 goto scrub; 3136 3137 /* Enable supply if rail is enabled */ 3138 if (_regulator_is_enabled(rdev)) { 3139 ret = regulator_enable(rdev->supply); 3140 if (ret < 0) 3141 goto scrub; 3142 } 3143 } 3144 3145 /* add consumers devices */ 3146 if (init_data) { 3147 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3148 ret = set_consumer_device_supply(rdev, 3149 init_data->consumer_supplies[i].dev_name, 3150 init_data->consumer_supplies[i].supply); 3151 if (ret < 0) { 3152 dev_err(dev, "Failed to set supply %s\n", 3153 init_data->consumer_supplies[i].supply); 3154 goto unset_supplies; 3155 } 3156 } 3157 } 3158 3159 list_add(&rdev->list, ®ulator_list); 3160 3161 rdev_init_debugfs(rdev); 3162out: 3163 mutex_unlock(®ulator_list_mutex); 3164 return rdev; 3165 3166unset_supplies: 3167 unset_regulator_supplies(rdev); 3168 3169scrub: 3170 if (rdev->supply) 3171 regulator_put(rdev->supply); 3172 kfree(rdev->constraints); 3173 device_unregister(&rdev->dev); 3174 /* device core frees rdev */ 3175 rdev = ERR_PTR(ret); 3176 goto out; 3177 3178clean: 3179 kfree(rdev); 3180 rdev = ERR_PTR(ret); 3181 goto out; 3182} 3183EXPORT_SYMBOL_GPL(regulator_register); 3184 3185/** 3186 * regulator_unregister - unregister regulator 3187 * @rdev: regulator to unregister 3188 * 3189 * Called by regulator drivers to unregister a regulator. 3190 */ 3191void regulator_unregister(struct regulator_dev *rdev) 3192{ 3193 if (rdev == NULL) 3194 return; 3195 3196 if (rdev->supply) 3197 regulator_put(rdev->supply); 3198 mutex_lock(®ulator_list_mutex); 3199 debugfs_remove_recursive(rdev->debugfs); 3200 flush_work_sync(&rdev->disable_work.work); 3201 WARN_ON(rdev->open_count); 3202 unset_regulator_supplies(rdev); 3203 list_del(&rdev->list); 3204 kfree(rdev->constraints); 3205 device_unregister(&rdev->dev); 3206 mutex_unlock(®ulator_list_mutex); 3207} 3208EXPORT_SYMBOL_GPL(regulator_unregister); 3209 3210/** 3211 * regulator_suspend_prepare - prepare regulators for system wide suspend 3212 * @state: system suspend state 3213 * 3214 * Configure each regulator with it's suspend operating parameters for state. 3215 * This will usually be called by machine suspend code prior to supending. 3216 */ 3217int regulator_suspend_prepare(suspend_state_t state) 3218{ 3219 struct regulator_dev *rdev; 3220 int ret = 0; 3221 3222 /* ON is handled by regulator active state */ 3223 if (state == PM_SUSPEND_ON) 3224 return -EINVAL; 3225 3226 mutex_lock(®ulator_list_mutex); 3227 list_for_each_entry(rdev, ®ulator_list, list) { 3228 3229 mutex_lock(&rdev->mutex); 3230 ret = suspend_prepare(rdev, state); 3231 mutex_unlock(&rdev->mutex); 3232 3233 if (ret < 0) { 3234 rdev_err(rdev, "failed to prepare\n"); 3235 goto out; 3236 } 3237 } 3238out: 3239 mutex_unlock(®ulator_list_mutex); 3240 return ret; 3241} 3242EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3243 3244/** 3245 * regulator_suspend_finish - resume regulators from system wide suspend 3246 * 3247 * Turn on regulators that might be turned off by regulator_suspend_prepare 3248 * and that should be turned on according to the regulators properties. 3249 */ 3250int regulator_suspend_finish(void) 3251{ 3252 struct regulator_dev *rdev; 3253 int ret = 0, error; 3254 3255 mutex_lock(®ulator_list_mutex); 3256 list_for_each_entry(rdev, ®ulator_list, list) { 3257 struct regulator_ops *ops = rdev->desc->ops; 3258 3259 mutex_lock(&rdev->mutex); 3260 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3261 ops->enable) { 3262 error = ops->enable(rdev); 3263 if (error) 3264 ret = error; 3265 } else { 3266 if (!has_full_constraints) 3267 goto unlock; 3268 if (!ops->disable) 3269 goto unlock; 3270 if (!_regulator_is_enabled(rdev)) 3271 goto unlock; 3272 3273 error = ops->disable(rdev); 3274 if (error) 3275 ret = error; 3276 } 3277unlock: 3278 mutex_unlock(&rdev->mutex); 3279 } 3280 mutex_unlock(®ulator_list_mutex); 3281 return ret; 3282} 3283EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3284 3285/** 3286 * regulator_has_full_constraints - the system has fully specified constraints 3287 * 3288 * Calling this function will cause the regulator API to disable all 3289 * regulators which have a zero use count and don't have an always_on 3290 * constraint in a late_initcall. 3291 * 3292 * The intention is that this will become the default behaviour in a 3293 * future kernel release so users are encouraged to use this facility 3294 * now. 3295 */ 3296void regulator_has_full_constraints(void) 3297{ 3298 has_full_constraints = 1; 3299} 3300EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3301 3302/** 3303 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3304 * 3305 * Calling this function will cause the regulator API to provide a 3306 * dummy regulator to consumers if no physical regulator is found, 3307 * allowing most consumers to proceed as though a regulator were 3308 * configured. This allows systems such as those with software 3309 * controllable regulators for the CPU core only to be brought up more 3310 * readily. 3311 */ 3312void regulator_use_dummy_regulator(void) 3313{ 3314 board_wants_dummy_regulator = true; 3315} 3316EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3317 3318/** 3319 * rdev_get_drvdata - get rdev regulator driver data 3320 * @rdev: regulator 3321 * 3322 * Get rdev regulator driver private data. This call can be used in the 3323 * regulator driver context. 3324 */ 3325void *rdev_get_drvdata(struct regulator_dev *rdev) 3326{ 3327 return rdev->reg_data; 3328} 3329EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3330 3331/** 3332 * regulator_get_drvdata - get regulator driver data 3333 * @regulator: regulator 3334 * 3335 * Get regulator driver private data. This call can be used in the consumer 3336 * driver context when non API regulator specific functions need to be called. 3337 */ 3338void *regulator_get_drvdata(struct regulator *regulator) 3339{ 3340 return regulator->rdev->reg_data; 3341} 3342EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3343 3344/** 3345 * regulator_set_drvdata - set regulator driver data 3346 * @regulator: regulator 3347 * @data: data 3348 */ 3349void regulator_set_drvdata(struct regulator *regulator, void *data) 3350{ 3351 regulator->rdev->reg_data = data; 3352} 3353EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3354 3355/** 3356 * regulator_get_id - get regulator ID 3357 * @rdev: regulator 3358 */ 3359int rdev_get_id(struct regulator_dev *rdev) 3360{ 3361 return rdev->desc->id; 3362} 3363EXPORT_SYMBOL_GPL(rdev_get_id); 3364 3365struct device *rdev_get_dev(struct regulator_dev *rdev) 3366{ 3367 return &rdev->dev; 3368} 3369EXPORT_SYMBOL_GPL(rdev_get_dev); 3370 3371void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3372{ 3373 return reg_init_data->driver_data; 3374} 3375EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3376 3377#ifdef CONFIG_DEBUG_FS 3378static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3379 size_t count, loff_t *ppos) 3380{ 3381 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3382 ssize_t len, ret = 0; 3383 struct regulator_map *map; 3384 3385 if (!buf) 3386 return -ENOMEM; 3387 3388 list_for_each_entry(map, ®ulator_map_list, list) { 3389 len = snprintf(buf + ret, PAGE_SIZE - ret, 3390 "%s -> %s.%s\n", 3391 rdev_get_name(map->regulator), map->dev_name, 3392 map->supply); 3393 if (len >= 0) 3394 ret += len; 3395 if (ret > PAGE_SIZE) { 3396 ret = PAGE_SIZE; 3397 break; 3398 } 3399 } 3400 3401 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3402 3403 kfree(buf); 3404 3405 return ret; 3406} 3407#endif 3408 3409static const struct file_operations supply_map_fops = { 3410#ifdef CONFIG_DEBUG_FS 3411 .read = supply_map_read_file, 3412 .llseek = default_llseek, 3413#endif 3414}; 3415 3416static int __init regulator_init(void) 3417{ 3418 int ret; 3419 3420 ret = class_register(®ulator_class); 3421 3422 debugfs_root = debugfs_create_dir("regulator", NULL); 3423 if (!debugfs_root) 3424 pr_warn("regulator: Failed to create debugfs directory\n"); 3425 3426 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3427 &supply_map_fops); 3428 3429 regulator_dummy_init(); 3430 3431 return ret; 3432} 3433 3434/* init early to allow our consumers to complete system booting */ 3435core_initcall(regulator_init); 3436 3437static int __init regulator_init_complete(void) 3438{ 3439 struct regulator_dev *rdev; 3440 struct regulator_ops *ops; 3441 struct regulation_constraints *c; 3442 int enabled, ret; 3443 3444 mutex_lock(®ulator_list_mutex); 3445 3446 /* If we have a full configuration then disable any regulators 3447 * which are not in use or always_on. This will become the 3448 * default behaviour in the future. 3449 */ 3450 list_for_each_entry(rdev, ®ulator_list, list) { 3451 ops = rdev->desc->ops; 3452 c = rdev->constraints; 3453 3454 if (!ops->disable || (c && c->always_on)) 3455 continue; 3456 3457 mutex_lock(&rdev->mutex); 3458 3459 if (rdev->use_count) 3460 goto unlock; 3461 3462 /* If we can't read the status assume it's on. */ 3463 if (ops->is_enabled) 3464 enabled = ops->is_enabled(rdev); 3465 else 3466 enabled = 1; 3467 3468 if (!enabled) 3469 goto unlock; 3470 3471 if (has_full_constraints) { 3472 /* We log since this may kill the system if it 3473 * goes wrong. */ 3474 rdev_info(rdev, "disabling\n"); 3475 ret = ops->disable(rdev); 3476 if (ret != 0) { 3477 rdev_err(rdev, "couldn't disable: %d\n", ret); 3478 } 3479 } else { 3480 /* The intention is that in future we will 3481 * assume that full constraints are provided 3482 * so warn even if we aren't going to do 3483 * anything here. 3484 */ 3485 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3486 } 3487 3488unlock: 3489 mutex_unlock(&rdev->mutex); 3490 } 3491 3492 mutex_unlock(®ulator_list_mutex); 3493 3494 return 0; 3495} 3496late_initcall(regulator_init_complete); 3497