core.c revision c5f3939b8fe0c358d35397982e5afdef112afc81
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 struct regulator_dev *rdev = regulator->rdev; 1894 int i, voltages, ret; 1895 1896 /* If we can't change voltage check the current voltage */ 1897 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1898 ret = regulator_get_voltage(regulator); 1899 if (ret >= 0) 1900 return (min_uV >= ret && ret <= max_uV); 1901 else 1902 return ret; 1903 } 1904 1905 ret = regulator_count_voltages(regulator); 1906 if (ret < 0) 1907 return ret; 1908 voltages = ret; 1909 1910 for (i = 0; i < voltages; i++) { 1911 ret = regulator_list_voltage(regulator, i); 1912 1913 if (ret >= min_uV && ret <= max_uV) 1914 return 1; 1915 } 1916 1917 return 0; 1918} 1919EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1920 1921/** 1922 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1923 * 1924 * @rdev: regulator to operate on 1925 * 1926 * Regulators that use regmap for their register I/O can set the 1927 * vsel_reg and vsel_mask fields in their descriptor and then use this 1928 * as their get_voltage_vsel operation, saving some code. 1929 */ 1930int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1931{ 1932 unsigned int val; 1933 int ret; 1934 1935 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1936 if (ret != 0) 1937 return ret; 1938 1939 val &= rdev->desc->vsel_mask; 1940 val >>= ffs(rdev->desc->vsel_mask) - 1; 1941 1942 return val; 1943} 1944EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1945 1946/** 1947 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1948 * 1949 * @rdev: regulator to operate on 1950 * @sel: Selector to set 1951 * 1952 * Regulators that use regmap for their register I/O can set the 1953 * vsel_reg and vsel_mask fields in their descriptor and then use this 1954 * as their set_voltage_vsel operation, saving some code. 1955 */ 1956int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 1957{ 1958 sel <<= ffs(rdev->desc->vsel_mask) - 1; 1959 1960 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 1961 rdev->desc->vsel_mask, sel); 1962} 1963EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 1964 1965/** 1966 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 1967 * 1968 * @rdev: Regulator to operate on 1969 * @min_uV: Lower bound for voltage 1970 * @max_uV: Upper bound for voltage 1971 * 1972 * Drivers implementing set_voltage_sel() and list_voltage() can use 1973 * this as their map_voltage() operation. It will find a suitable 1974 * voltage by calling list_voltage() until it gets something in bounds 1975 * for the requested voltages. 1976 */ 1977int regulator_map_voltage_iterate(struct regulator_dev *rdev, 1978 int min_uV, int max_uV) 1979{ 1980 int best_val = INT_MAX; 1981 int selector = 0; 1982 int i, ret; 1983 1984 /* Find the smallest voltage that falls within the specified 1985 * range. 1986 */ 1987 for (i = 0; i < rdev->desc->n_voltages; i++) { 1988 ret = rdev->desc->ops->list_voltage(rdev, i); 1989 if (ret < 0) 1990 continue; 1991 1992 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1993 best_val = ret; 1994 selector = i; 1995 } 1996 } 1997 1998 if (best_val != INT_MAX) 1999 return selector; 2000 else 2001 return -EINVAL; 2002} 2003EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2004 2005/** 2006 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2007 * 2008 * @rdev: Regulator to operate on 2009 * @min_uV: Lower bound for voltage 2010 * @max_uV: Upper bound for voltage 2011 * 2012 * Drivers providing min_uV and uV_step in their regulator_desc can 2013 * use this as their map_voltage() operation. 2014 */ 2015int regulator_map_voltage_linear(struct regulator_dev *rdev, 2016 int min_uV, int max_uV) 2017{ 2018 int ret, voltage; 2019 2020 if (!rdev->desc->uV_step) { 2021 BUG_ON(!rdev->desc->uV_step); 2022 return -EINVAL; 2023 } 2024 2025 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2026 if (ret < 0) 2027 return ret; 2028 2029 /* Map back into a voltage to verify we're still in bounds */ 2030 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2031 if (voltage < min_uV || voltage > max_uV) 2032 return -EINVAL; 2033 2034 return ret; 2035} 2036EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2037 2038static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2039 int min_uV, int max_uV) 2040{ 2041 int ret; 2042 int delay = 0; 2043 int best_val; 2044 unsigned int selector; 2045 int old_selector = -1; 2046 2047 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2048 2049 min_uV += rdev->constraints->uV_offset; 2050 max_uV += rdev->constraints->uV_offset; 2051 2052 /* 2053 * If we can't obtain the old selector there is not enough 2054 * info to call set_voltage_time_sel(). 2055 */ 2056 if (_regulator_is_enabled(rdev) && 2057 rdev->desc->ops->set_voltage_time_sel && 2058 rdev->desc->ops->get_voltage_sel) { 2059 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2060 if (old_selector < 0) 2061 return old_selector; 2062 } 2063 2064 if (rdev->desc->ops->set_voltage) { 2065 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2066 &selector); 2067 } else if (rdev->desc->ops->set_voltage_sel) { 2068 if (rdev->desc->ops->map_voltage) { 2069 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2070 max_uV); 2071 } else { 2072 if (rdev->desc->ops->list_voltage == 2073 regulator_list_voltage_linear) 2074 ret = regulator_map_voltage_linear(rdev, 2075 min_uV, max_uV); 2076 else 2077 ret = regulator_map_voltage_iterate(rdev, 2078 min_uV, max_uV); 2079 } 2080 2081 if (ret >= 0) { 2082 selector = ret; 2083 ret = rdev->desc->ops->set_voltage_sel(rdev, ret); 2084 } 2085 } else { 2086 ret = -EINVAL; 2087 } 2088 2089 if (rdev->desc->ops->list_voltage) 2090 best_val = rdev->desc->ops->list_voltage(rdev, selector); 2091 else 2092 best_val = _regulator_get_voltage(rdev); 2093 2094 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2095 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2096 rdev->desc->ops->set_voltage_time_sel) { 2097 2098 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2099 old_selector, selector); 2100 if (delay < 0) { 2101 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2102 delay); 2103 delay = 0; 2104 } 2105 2106 /* Insert any necessary delays */ 2107 if (delay >= 1000) { 2108 mdelay(delay / 1000); 2109 udelay(delay % 1000); 2110 } else if (delay) { 2111 udelay(delay); 2112 } 2113 } 2114 2115 if (ret == 0 && best_val >= 0) 2116 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2117 (void *)best_val); 2118 2119 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2120 2121 return ret; 2122} 2123 2124/** 2125 * regulator_set_voltage - set regulator output voltage 2126 * @regulator: regulator source 2127 * @min_uV: Minimum required voltage in uV 2128 * @max_uV: Maximum acceptable voltage in uV 2129 * 2130 * Sets a voltage regulator to the desired output voltage. This can be set 2131 * during any regulator state. IOW, regulator can be disabled or enabled. 2132 * 2133 * If the regulator is enabled then the voltage will change to the new value 2134 * immediately otherwise if the regulator is disabled the regulator will 2135 * output at the new voltage when enabled. 2136 * 2137 * NOTE: If the regulator is shared between several devices then the lowest 2138 * request voltage that meets the system constraints will be used. 2139 * Regulator system constraints must be set for this regulator before 2140 * calling this function otherwise this call will fail. 2141 */ 2142int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2143{ 2144 struct regulator_dev *rdev = regulator->rdev; 2145 int ret = 0; 2146 2147 mutex_lock(&rdev->mutex); 2148 2149 /* If we're setting the same range as last time the change 2150 * should be a noop (some cpufreq implementations use the same 2151 * voltage for multiple frequencies, for example). 2152 */ 2153 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2154 goto out; 2155 2156 /* sanity check */ 2157 if (!rdev->desc->ops->set_voltage && 2158 !rdev->desc->ops->set_voltage_sel) { 2159 ret = -EINVAL; 2160 goto out; 2161 } 2162 2163 /* constraints check */ 2164 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2165 if (ret < 0) 2166 goto out; 2167 regulator->min_uV = min_uV; 2168 regulator->max_uV = max_uV; 2169 2170 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2171 if (ret < 0) 2172 goto out; 2173 2174 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2175 2176out: 2177 mutex_unlock(&rdev->mutex); 2178 return ret; 2179} 2180EXPORT_SYMBOL_GPL(regulator_set_voltage); 2181 2182/** 2183 * regulator_set_voltage_time - get raise/fall time 2184 * @regulator: regulator source 2185 * @old_uV: starting voltage in microvolts 2186 * @new_uV: target voltage in microvolts 2187 * 2188 * Provided with the starting and ending voltage, this function attempts to 2189 * calculate the time in microseconds required to rise or fall to this new 2190 * voltage. 2191 */ 2192int regulator_set_voltage_time(struct regulator *regulator, 2193 int old_uV, int new_uV) 2194{ 2195 struct regulator_dev *rdev = regulator->rdev; 2196 struct regulator_ops *ops = rdev->desc->ops; 2197 int old_sel = -1; 2198 int new_sel = -1; 2199 int voltage; 2200 int i; 2201 2202 /* Currently requires operations to do this */ 2203 if (!ops->list_voltage || !ops->set_voltage_time_sel 2204 || !rdev->desc->n_voltages) 2205 return -EINVAL; 2206 2207 for (i = 0; i < rdev->desc->n_voltages; i++) { 2208 /* We only look for exact voltage matches here */ 2209 voltage = regulator_list_voltage(regulator, i); 2210 if (voltage < 0) 2211 return -EINVAL; 2212 if (voltage == 0) 2213 continue; 2214 if (voltage == old_uV) 2215 old_sel = i; 2216 if (voltage == new_uV) 2217 new_sel = i; 2218 } 2219 2220 if (old_sel < 0 || new_sel < 0) 2221 return -EINVAL; 2222 2223 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2224} 2225EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2226 2227/** 2228 * regulator_sync_voltage - re-apply last regulator output voltage 2229 * @regulator: regulator source 2230 * 2231 * Re-apply the last configured voltage. This is intended to be used 2232 * where some external control source the consumer is cooperating with 2233 * has caused the configured voltage to change. 2234 */ 2235int regulator_sync_voltage(struct regulator *regulator) 2236{ 2237 struct regulator_dev *rdev = regulator->rdev; 2238 int ret, min_uV, max_uV; 2239 2240 mutex_lock(&rdev->mutex); 2241 2242 if (!rdev->desc->ops->set_voltage && 2243 !rdev->desc->ops->set_voltage_sel) { 2244 ret = -EINVAL; 2245 goto out; 2246 } 2247 2248 /* This is only going to work if we've had a voltage configured. */ 2249 if (!regulator->min_uV && !regulator->max_uV) { 2250 ret = -EINVAL; 2251 goto out; 2252 } 2253 2254 min_uV = regulator->min_uV; 2255 max_uV = regulator->max_uV; 2256 2257 /* This should be a paranoia check... */ 2258 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2259 if (ret < 0) 2260 goto out; 2261 2262 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2263 if (ret < 0) 2264 goto out; 2265 2266 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2267 2268out: 2269 mutex_unlock(&rdev->mutex); 2270 return ret; 2271} 2272EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2273 2274static int _regulator_get_voltage(struct regulator_dev *rdev) 2275{ 2276 int sel, ret; 2277 2278 if (rdev->desc->ops->get_voltage_sel) { 2279 sel = rdev->desc->ops->get_voltage_sel(rdev); 2280 if (sel < 0) 2281 return sel; 2282 ret = rdev->desc->ops->list_voltage(rdev, sel); 2283 } else if (rdev->desc->ops->get_voltage) { 2284 ret = rdev->desc->ops->get_voltage(rdev); 2285 } else { 2286 return -EINVAL; 2287 } 2288 2289 if (ret < 0) 2290 return ret; 2291 return ret - rdev->constraints->uV_offset; 2292} 2293 2294/** 2295 * regulator_get_voltage - get regulator output voltage 2296 * @regulator: regulator source 2297 * 2298 * This returns the current regulator voltage in uV. 2299 * 2300 * NOTE: If the regulator is disabled it will return the voltage value. This 2301 * function should not be used to determine regulator state. 2302 */ 2303int regulator_get_voltage(struct regulator *regulator) 2304{ 2305 int ret; 2306 2307 mutex_lock(®ulator->rdev->mutex); 2308 2309 ret = _regulator_get_voltage(regulator->rdev); 2310 2311 mutex_unlock(®ulator->rdev->mutex); 2312 2313 return ret; 2314} 2315EXPORT_SYMBOL_GPL(regulator_get_voltage); 2316 2317/** 2318 * regulator_set_current_limit - set regulator output current limit 2319 * @regulator: regulator source 2320 * @min_uA: Minimuum supported current in uA 2321 * @max_uA: Maximum supported current in uA 2322 * 2323 * Sets current sink to the desired output current. This can be set during 2324 * any regulator state. IOW, regulator can be disabled or enabled. 2325 * 2326 * If the regulator is enabled then the current will change to the new value 2327 * immediately otherwise if the regulator is disabled the regulator will 2328 * output at the new current when enabled. 2329 * 2330 * NOTE: Regulator system constraints must be set for this regulator before 2331 * calling this function otherwise this call will fail. 2332 */ 2333int regulator_set_current_limit(struct regulator *regulator, 2334 int min_uA, int max_uA) 2335{ 2336 struct regulator_dev *rdev = regulator->rdev; 2337 int ret; 2338 2339 mutex_lock(&rdev->mutex); 2340 2341 /* sanity check */ 2342 if (!rdev->desc->ops->set_current_limit) { 2343 ret = -EINVAL; 2344 goto out; 2345 } 2346 2347 /* constraints check */ 2348 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2349 if (ret < 0) 2350 goto out; 2351 2352 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2353out: 2354 mutex_unlock(&rdev->mutex); 2355 return ret; 2356} 2357EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2358 2359static int _regulator_get_current_limit(struct regulator_dev *rdev) 2360{ 2361 int ret; 2362 2363 mutex_lock(&rdev->mutex); 2364 2365 /* sanity check */ 2366 if (!rdev->desc->ops->get_current_limit) { 2367 ret = -EINVAL; 2368 goto out; 2369 } 2370 2371 ret = rdev->desc->ops->get_current_limit(rdev); 2372out: 2373 mutex_unlock(&rdev->mutex); 2374 return ret; 2375} 2376 2377/** 2378 * regulator_get_current_limit - get regulator output current 2379 * @regulator: regulator source 2380 * 2381 * This returns the current supplied by the specified current sink in uA. 2382 * 2383 * NOTE: If the regulator is disabled it will return the current value. This 2384 * function should not be used to determine regulator state. 2385 */ 2386int regulator_get_current_limit(struct regulator *regulator) 2387{ 2388 return _regulator_get_current_limit(regulator->rdev); 2389} 2390EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2391 2392/** 2393 * regulator_set_mode - set regulator operating mode 2394 * @regulator: regulator source 2395 * @mode: operating mode - one of the REGULATOR_MODE constants 2396 * 2397 * Set regulator operating mode to increase regulator efficiency or improve 2398 * regulation performance. 2399 * 2400 * NOTE: Regulator system constraints must be set for this regulator before 2401 * calling this function otherwise this call will fail. 2402 */ 2403int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2404{ 2405 struct regulator_dev *rdev = regulator->rdev; 2406 int ret; 2407 int regulator_curr_mode; 2408 2409 mutex_lock(&rdev->mutex); 2410 2411 /* sanity check */ 2412 if (!rdev->desc->ops->set_mode) { 2413 ret = -EINVAL; 2414 goto out; 2415 } 2416 2417 /* return if the same mode is requested */ 2418 if (rdev->desc->ops->get_mode) { 2419 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2420 if (regulator_curr_mode == mode) { 2421 ret = 0; 2422 goto out; 2423 } 2424 } 2425 2426 /* constraints check */ 2427 ret = regulator_mode_constrain(rdev, &mode); 2428 if (ret < 0) 2429 goto out; 2430 2431 ret = rdev->desc->ops->set_mode(rdev, mode); 2432out: 2433 mutex_unlock(&rdev->mutex); 2434 return ret; 2435} 2436EXPORT_SYMBOL_GPL(regulator_set_mode); 2437 2438static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2439{ 2440 int ret; 2441 2442 mutex_lock(&rdev->mutex); 2443 2444 /* sanity check */ 2445 if (!rdev->desc->ops->get_mode) { 2446 ret = -EINVAL; 2447 goto out; 2448 } 2449 2450 ret = rdev->desc->ops->get_mode(rdev); 2451out: 2452 mutex_unlock(&rdev->mutex); 2453 return ret; 2454} 2455 2456/** 2457 * regulator_get_mode - get regulator operating mode 2458 * @regulator: regulator source 2459 * 2460 * Get the current regulator operating mode. 2461 */ 2462unsigned int regulator_get_mode(struct regulator *regulator) 2463{ 2464 return _regulator_get_mode(regulator->rdev); 2465} 2466EXPORT_SYMBOL_GPL(regulator_get_mode); 2467 2468/** 2469 * regulator_set_optimum_mode - set regulator optimum operating mode 2470 * @regulator: regulator source 2471 * @uA_load: load current 2472 * 2473 * Notifies the regulator core of a new device load. This is then used by 2474 * DRMS (if enabled by constraints) to set the most efficient regulator 2475 * operating mode for the new regulator loading. 2476 * 2477 * Consumer devices notify their supply regulator of the maximum power 2478 * they will require (can be taken from device datasheet in the power 2479 * consumption tables) when they change operational status and hence power 2480 * state. Examples of operational state changes that can affect power 2481 * consumption are :- 2482 * 2483 * o Device is opened / closed. 2484 * o Device I/O is about to begin or has just finished. 2485 * o Device is idling in between work. 2486 * 2487 * This information is also exported via sysfs to userspace. 2488 * 2489 * DRMS will sum the total requested load on the regulator and change 2490 * to the most efficient operating mode if platform constraints allow. 2491 * 2492 * Returns the new regulator mode or error. 2493 */ 2494int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2495{ 2496 struct regulator_dev *rdev = regulator->rdev; 2497 struct regulator *consumer; 2498 int ret, output_uV, input_uV, total_uA_load = 0; 2499 unsigned int mode; 2500 2501 mutex_lock(&rdev->mutex); 2502 2503 /* 2504 * first check to see if we can set modes at all, otherwise just 2505 * tell the consumer everything is OK. 2506 */ 2507 regulator->uA_load = uA_load; 2508 ret = regulator_check_drms(rdev); 2509 if (ret < 0) { 2510 ret = 0; 2511 goto out; 2512 } 2513 2514 if (!rdev->desc->ops->get_optimum_mode) 2515 goto out; 2516 2517 /* 2518 * we can actually do this so any errors are indicators of 2519 * potential real failure. 2520 */ 2521 ret = -EINVAL; 2522 2523 if (!rdev->desc->ops->set_mode) 2524 goto out; 2525 2526 /* get output voltage */ 2527 output_uV = _regulator_get_voltage(rdev); 2528 if (output_uV <= 0) { 2529 rdev_err(rdev, "invalid output voltage found\n"); 2530 goto out; 2531 } 2532 2533 /* get input voltage */ 2534 input_uV = 0; 2535 if (rdev->supply) 2536 input_uV = regulator_get_voltage(rdev->supply); 2537 if (input_uV <= 0) 2538 input_uV = rdev->constraints->input_uV; 2539 if (input_uV <= 0) { 2540 rdev_err(rdev, "invalid input voltage found\n"); 2541 goto out; 2542 } 2543 2544 /* calc total requested load for this regulator */ 2545 list_for_each_entry(consumer, &rdev->consumer_list, list) 2546 total_uA_load += consumer->uA_load; 2547 2548 mode = rdev->desc->ops->get_optimum_mode(rdev, 2549 input_uV, output_uV, 2550 total_uA_load); 2551 ret = regulator_mode_constrain(rdev, &mode); 2552 if (ret < 0) { 2553 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2554 total_uA_load, input_uV, output_uV); 2555 goto out; 2556 } 2557 2558 ret = rdev->desc->ops->set_mode(rdev, mode); 2559 if (ret < 0) { 2560 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2561 goto out; 2562 } 2563 ret = mode; 2564out: 2565 mutex_unlock(&rdev->mutex); 2566 return ret; 2567} 2568EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2569 2570/** 2571 * regulator_register_notifier - register regulator event notifier 2572 * @regulator: regulator source 2573 * @nb: notifier block 2574 * 2575 * Register notifier block to receive regulator events. 2576 */ 2577int regulator_register_notifier(struct regulator *regulator, 2578 struct notifier_block *nb) 2579{ 2580 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2581 nb); 2582} 2583EXPORT_SYMBOL_GPL(regulator_register_notifier); 2584 2585/** 2586 * regulator_unregister_notifier - unregister regulator event notifier 2587 * @regulator: regulator source 2588 * @nb: notifier block 2589 * 2590 * Unregister regulator event notifier block. 2591 */ 2592int regulator_unregister_notifier(struct regulator *regulator, 2593 struct notifier_block *nb) 2594{ 2595 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2596 nb); 2597} 2598EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2599 2600/* notify regulator consumers and downstream regulator consumers. 2601 * Note mutex must be held by caller. 2602 */ 2603static void _notifier_call_chain(struct regulator_dev *rdev, 2604 unsigned long event, void *data) 2605{ 2606 /* call rdev chain first */ 2607 blocking_notifier_call_chain(&rdev->notifier, event, data); 2608} 2609 2610/** 2611 * regulator_bulk_get - get multiple regulator consumers 2612 * 2613 * @dev: Device to supply 2614 * @num_consumers: Number of consumers to register 2615 * @consumers: Configuration of consumers; clients are stored here. 2616 * 2617 * @return 0 on success, an errno on failure. 2618 * 2619 * This helper function allows drivers to get several regulator 2620 * consumers in one operation. If any of the regulators cannot be 2621 * acquired then any regulators that were allocated will be freed 2622 * before returning to the caller. 2623 */ 2624int regulator_bulk_get(struct device *dev, int num_consumers, 2625 struct regulator_bulk_data *consumers) 2626{ 2627 int i; 2628 int ret; 2629 2630 for (i = 0; i < num_consumers; i++) 2631 consumers[i].consumer = NULL; 2632 2633 for (i = 0; i < num_consumers; i++) { 2634 consumers[i].consumer = regulator_get(dev, 2635 consumers[i].supply); 2636 if (IS_ERR(consumers[i].consumer)) { 2637 ret = PTR_ERR(consumers[i].consumer); 2638 dev_err(dev, "Failed to get supply '%s': %d\n", 2639 consumers[i].supply, ret); 2640 consumers[i].consumer = NULL; 2641 goto err; 2642 } 2643 } 2644 2645 return 0; 2646 2647err: 2648 while (--i >= 0) 2649 regulator_put(consumers[i].consumer); 2650 2651 return ret; 2652} 2653EXPORT_SYMBOL_GPL(regulator_bulk_get); 2654 2655/** 2656 * devm_regulator_bulk_get - managed get multiple regulator consumers 2657 * 2658 * @dev: Device to supply 2659 * @num_consumers: Number of consumers to register 2660 * @consumers: Configuration of consumers; clients are stored here. 2661 * 2662 * @return 0 on success, an errno on failure. 2663 * 2664 * This helper function allows drivers to get several regulator 2665 * consumers in one operation with management, the regulators will 2666 * automatically be freed when the device is unbound. If any of the 2667 * regulators cannot be acquired then any regulators that were 2668 * allocated will be freed before returning to the caller. 2669 */ 2670int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2671 struct regulator_bulk_data *consumers) 2672{ 2673 int i; 2674 int ret; 2675 2676 for (i = 0; i < num_consumers; i++) 2677 consumers[i].consumer = NULL; 2678 2679 for (i = 0; i < num_consumers; i++) { 2680 consumers[i].consumer = devm_regulator_get(dev, 2681 consumers[i].supply); 2682 if (IS_ERR(consumers[i].consumer)) { 2683 ret = PTR_ERR(consumers[i].consumer); 2684 dev_err(dev, "Failed to get supply '%s': %d\n", 2685 consumers[i].supply, ret); 2686 consumers[i].consumer = NULL; 2687 goto err; 2688 } 2689 } 2690 2691 return 0; 2692 2693err: 2694 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2695 devm_regulator_put(consumers[i].consumer); 2696 2697 return ret; 2698} 2699EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2700 2701static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2702{ 2703 struct regulator_bulk_data *bulk = data; 2704 2705 bulk->ret = regulator_enable(bulk->consumer); 2706} 2707 2708/** 2709 * regulator_bulk_enable - enable multiple regulator consumers 2710 * 2711 * @num_consumers: Number of consumers 2712 * @consumers: Consumer data; clients are stored here. 2713 * @return 0 on success, an errno on failure 2714 * 2715 * This convenience API allows consumers to enable multiple regulator 2716 * clients in a single API call. If any consumers cannot be enabled 2717 * then any others that were enabled will be disabled again prior to 2718 * return. 2719 */ 2720int regulator_bulk_enable(int num_consumers, 2721 struct regulator_bulk_data *consumers) 2722{ 2723 LIST_HEAD(async_domain); 2724 int i; 2725 int ret = 0; 2726 2727 for (i = 0; i < num_consumers; i++) { 2728 if (consumers[i].consumer->always_on) 2729 consumers[i].ret = 0; 2730 else 2731 async_schedule_domain(regulator_bulk_enable_async, 2732 &consumers[i], &async_domain); 2733 } 2734 2735 async_synchronize_full_domain(&async_domain); 2736 2737 /* If any consumer failed we need to unwind any that succeeded */ 2738 for (i = 0; i < num_consumers; i++) { 2739 if (consumers[i].ret != 0) { 2740 ret = consumers[i].ret; 2741 goto err; 2742 } 2743 } 2744 2745 return 0; 2746 2747err: 2748 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2749 while (--i >= 0) 2750 regulator_disable(consumers[i].consumer); 2751 2752 return ret; 2753} 2754EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2755 2756/** 2757 * regulator_bulk_disable - disable multiple regulator consumers 2758 * 2759 * @num_consumers: Number of consumers 2760 * @consumers: Consumer data; clients are stored here. 2761 * @return 0 on success, an errno on failure 2762 * 2763 * This convenience API allows consumers to disable multiple regulator 2764 * clients in a single API call. If any consumers cannot be disabled 2765 * then any others that were disabled will be enabled again prior to 2766 * return. 2767 */ 2768int regulator_bulk_disable(int num_consumers, 2769 struct regulator_bulk_data *consumers) 2770{ 2771 int i; 2772 int ret, r; 2773 2774 for (i = num_consumers - 1; i >= 0; --i) { 2775 ret = regulator_disable(consumers[i].consumer); 2776 if (ret != 0) 2777 goto err; 2778 } 2779 2780 return 0; 2781 2782err: 2783 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2784 for (++i; i < num_consumers; ++i) { 2785 r = regulator_enable(consumers[i].consumer); 2786 if (r != 0) 2787 pr_err("Failed to reename %s: %d\n", 2788 consumers[i].supply, r); 2789 } 2790 2791 return ret; 2792} 2793EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2794 2795/** 2796 * regulator_bulk_force_disable - force disable multiple regulator consumers 2797 * 2798 * @num_consumers: Number of consumers 2799 * @consumers: Consumer data; clients are stored here. 2800 * @return 0 on success, an errno on failure 2801 * 2802 * This convenience API allows consumers to forcibly disable multiple regulator 2803 * clients in a single API call. 2804 * NOTE: This should be used for situations when device damage will 2805 * likely occur if the regulators are not disabled (e.g. over temp). 2806 * Although regulator_force_disable function call for some consumers can 2807 * return error numbers, the function is called for all consumers. 2808 */ 2809int regulator_bulk_force_disable(int num_consumers, 2810 struct regulator_bulk_data *consumers) 2811{ 2812 int i; 2813 int ret; 2814 2815 for (i = 0; i < num_consumers; i++) 2816 consumers[i].ret = 2817 regulator_force_disable(consumers[i].consumer); 2818 2819 for (i = 0; i < num_consumers; i++) { 2820 if (consumers[i].ret != 0) { 2821 ret = consumers[i].ret; 2822 goto out; 2823 } 2824 } 2825 2826 return 0; 2827out: 2828 return ret; 2829} 2830EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2831 2832/** 2833 * regulator_bulk_free - free multiple regulator consumers 2834 * 2835 * @num_consumers: Number of consumers 2836 * @consumers: Consumer data; clients are stored here. 2837 * 2838 * This convenience API allows consumers to free multiple regulator 2839 * clients in a single API call. 2840 */ 2841void regulator_bulk_free(int num_consumers, 2842 struct regulator_bulk_data *consumers) 2843{ 2844 int i; 2845 2846 for (i = 0; i < num_consumers; i++) { 2847 regulator_put(consumers[i].consumer); 2848 consumers[i].consumer = NULL; 2849 } 2850} 2851EXPORT_SYMBOL_GPL(regulator_bulk_free); 2852 2853/** 2854 * regulator_notifier_call_chain - call regulator event notifier 2855 * @rdev: regulator source 2856 * @event: notifier block 2857 * @data: callback-specific data. 2858 * 2859 * Called by regulator drivers to notify clients a regulator event has 2860 * occurred. We also notify regulator clients downstream. 2861 * Note lock must be held by caller. 2862 */ 2863int regulator_notifier_call_chain(struct regulator_dev *rdev, 2864 unsigned long event, void *data) 2865{ 2866 _notifier_call_chain(rdev, event, data); 2867 return NOTIFY_DONE; 2868 2869} 2870EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2871 2872/** 2873 * regulator_mode_to_status - convert a regulator mode into a status 2874 * 2875 * @mode: Mode to convert 2876 * 2877 * Convert a regulator mode into a status. 2878 */ 2879int regulator_mode_to_status(unsigned int mode) 2880{ 2881 switch (mode) { 2882 case REGULATOR_MODE_FAST: 2883 return REGULATOR_STATUS_FAST; 2884 case REGULATOR_MODE_NORMAL: 2885 return REGULATOR_STATUS_NORMAL; 2886 case REGULATOR_MODE_IDLE: 2887 return REGULATOR_STATUS_IDLE; 2888 case REGULATOR_STATUS_STANDBY: 2889 return REGULATOR_STATUS_STANDBY; 2890 default: 2891 return 0; 2892 } 2893} 2894EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2895 2896/* 2897 * To avoid cluttering sysfs (and memory) with useless state, only 2898 * create attributes that can be meaningfully displayed. 2899 */ 2900static int add_regulator_attributes(struct regulator_dev *rdev) 2901{ 2902 struct device *dev = &rdev->dev; 2903 struct regulator_ops *ops = rdev->desc->ops; 2904 int status = 0; 2905 2906 /* some attributes need specific methods to be displayed */ 2907 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2908 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2909 status = device_create_file(dev, &dev_attr_microvolts); 2910 if (status < 0) 2911 return status; 2912 } 2913 if (ops->get_current_limit) { 2914 status = device_create_file(dev, &dev_attr_microamps); 2915 if (status < 0) 2916 return status; 2917 } 2918 if (ops->get_mode) { 2919 status = device_create_file(dev, &dev_attr_opmode); 2920 if (status < 0) 2921 return status; 2922 } 2923 if (ops->is_enabled) { 2924 status = device_create_file(dev, &dev_attr_state); 2925 if (status < 0) 2926 return status; 2927 } 2928 if (ops->get_status) { 2929 status = device_create_file(dev, &dev_attr_status); 2930 if (status < 0) 2931 return status; 2932 } 2933 2934 /* some attributes are type-specific */ 2935 if (rdev->desc->type == REGULATOR_CURRENT) { 2936 status = device_create_file(dev, &dev_attr_requested_microamps); 2937 if (status < 0) 2938 return status; 2939 } 2940 2941 /* all the other attributes exist to support constraints; 2942 * don't show them if there are no constraints, or if the 2943 * relevant supporting methods are missing. 2944 */ 2945 if (!rdev->constraints) 2946 return status; 2947 2948 /* constraints need specific supporting methods */ 2949 if (ops->set_voltage || ops->set_voltage_sel) { 2950 status = device_create_file(dev, &dev_attr_min_microvolts); 2951 if (status < 0) 2952 return status; 2953 status = device_create_file(dev, &dev_attr_max_microvolts); 2954 if (status < 0) 2955 return status; 2956 } 2957 if (ops->set_current_limit) { 2958 status = device_create_file(dev, &dev_attr_min_microamps); 2959 if (status < 0) 2960 return status; 2961 status = device_create_file(dev, &dev_attr_max_microamps); 2962 if (status < 0) 2963 return status; 2964 } 2965 2966 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2967 if (status < 0) 2968 return status; 2969 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2970 if (status < 0) 2971 return status; 2972 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2973 if (status < 0) 2974 return status; 2975 2976 if (ops->set_suspend_voltage) { 2977 status = device_create_file(dev, 2978 &dev_attr_suspend_standby_microvolts); 2979 if (status < 0) 2980 return status; 2981 status = device_create_file(dev, 2982 &dev_attr_suspend_mem_microvolts); 2983 if (status < 0) 2984 return status; 2985 status = device_create_file(dev, 2986 &dev_attr_suspend_disk_microvolts); 2987 if (status < 0) 2988 return status; 2989 } 2990 2991 if (ops->set_suspend_mode) { 2992 status = device_create_file(dev, 2993 &dev_attr_suspend_standby_mode); 2994 if (status < 0) 2995 return status; 2996 status = device_create_file(dev, 2997 &dev_attr_suspend_mem_mode); 2998 if (status < 0) 2999 return status; 3000 status = device_create_file(dev, 3001 &dev_attr_suspend_disk_mode); 3002 if (status < 0) 3003 return status; 3004 } 3005 3006 return status; 3007} 3008 3009static void rdev_init_debugfs(struct regulator_dev *rdev) 3010{ 3011 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3012 if (!rdev->debugfs) { 3013 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3014 return; 3015 } 3016 3017 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3018 &rdev->use_count); 3019 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3020 &rdev->open_count); 3021} 3022 3023/** 3024 * regulator_register - register regulator 3025 * @regulator_desc: regulator to register 3026 * @config: runtime configuration for regulator 3027 * 3028 * Called by regulator drivers to register a regulator. 3029 * Returns 0 on success. 3030 */ 3031struct regulator_dev * 3032regulator_register(const struct regulator_desc *regulator_desc, 3033 const struct regulator_config *config) 3034{ 3035 const struct regulation_constraints *constraints = NULL; 3036 const struct regulator_init_data *init_data; 3037 static atomic_t regulator_no = ATOMIC_INIT(0); 3038 struct regulator_dev *rdev; 3039 struct device *dev; 3040 int ret, i; 3041 const char *supply = NULL; 3042 3043 if (regulator_desc == NULL || config == NULL) 3044 return ERR_PTR(-EINVAL); 3045 3046 dev = config->dev; 3047 WARN_ON(!dev); 3048 3049 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3050 return ERR_PTR(-EINVAL); 3051 3052 if (regulator_desc->type != REGULATOR_VOLTAGE && 3053 regulator_desc->type != REGULATOR_CURRENT) 3054 return ERR_PTR(-EINVAL); 3055 3056 /* Only one of each should be implemented */ 3057 WARN_ON(regulator_desc->ops->get_voltage && 3058 regulator_desc->ops->get_voltage_sel); 3059 WARN_ON(regulator_desc->ops->set_voltage && 3060 regulator_desc->ops->set_voltage_sel); 3061 3062 /* If we're using selectors we must implement list_voltage. */ 3063 if (regulator_desc->ops->get_voltage_sel && 3064 !regulator_desc->ops->list_voltage) { 3065 return ERR_PTR(-EINVAL); 3066 } 3067 if (regulator_desc->ops->set_voltage_sel && 3068 !regulator_desc->ops->list_voltage) { 3069 return ERR_PTR(-EINVAL); 3070 } 3071 3072 init_data = config->init_data; 3073 3074 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3075 if (rdev == NULL) 3076 return ERR_PTR(-ENOMEM); 3077 3078 mutex_lock(®ulator_list_mutex); 3079 3080 mutex_init(&rdev->mutex); 3081 rdev->reg_data = config->driver_data; 3082 rdev->owner = regulator_desc->owner; 3083 rdev->desc = regulator_desc; 3084 if (config->regmap) 3085 rdev->regmap = config->regmap; 3086 else 3087 rdev->regmap = dev_get_regmap(dev, NULL); 3088 INIT_LIST_HEAD(&rdev->consumer_list); 3089 INIT_LIST_HEAD(&rdev->list); 3090 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3091 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3092 3093 /* preform any regulator specific init */ 3094 if (init_data && init_data->regulator_init) { 3095 ret = init_data->regulator_init(rdev->reg_data); 3096 if (ret < 0) 3097 goto clean; 3098 } 3099 3100 /* register with sysfs */ 3101 rdev->dev.class = ®ulator_class; 3102 rdev->dev.of_node = config->of_node; 3103 rdev->dev.parent = dev; 3104 dev_set_name(&rdev->dev, "regulator.%d", 3105 atomic_inc_return(®ulator_no) - 1); 3106 ret = device_register(&rdev->dev); 3107 if (ret != 0) { 3108 put_device(&rdev->dev); 3109 goto clean; 3110 } 3111 3112 dev_set_drvdata(&rdev->dev, rdev); 3113 3114 /* set regulator constraints */ 3115 if (init_data) 3116 constraints = &init_data->constraints; 3117 3118 ret = set_machine_constraints(rdev, constraints); 3119 if (ret < 0) 3120 goto scrub; 3121 3122 /* add attributes supported by this regulator */ 3123 ret = add_regulator_attributes(rdev); 3124 if (ret < 0) 3125 goto scrub; 3126 3127 if (init_data && init_data->supply_regulator) 3128 supply = init_data->supply_regulator; 3129 else if (regulator_desc->supply_name) 3130 supply = regulator_desc->supply_name; 3131 3132 if (supply) { 3133 struct regulator_dev *r; 3134 3135 r = regulator_dev_lookup(dev, supply, &ret); 3136 3137 if (!r) { 3138 dev_err(dev, "Failed to find supply %s\n", supply); 3139 ret = -EPROBE_DEFER; 3140 goto scrub; 3141 } 3142 3143 ret = set_supply(rdev, r); 3144 if (ret < 0) 3145 goto scrub; 3146 3147 /* Enable supply if rail is enabled */ 3148 if (_regulator_is_enabled(rdev)) { 3149 ret = regulator_enable(rdev->supply); 3150 if (ret < 0) 3151 goto scrub; 3152 } 3153 } 3154 3155 /* add consumers devices */ 3156 if (init_data) { 3157 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3158 ret = set_consumer_device_supply(rdev, 3159 init_data->consumer_supplies[i].dev_name, 3160 init_data->consumer_supplies[i].supply); 3161 if (ret < 0) { 3162 dev_err(dev, "Failed to set supply %s\n", 3163 init_data->consumer_supplies[i].supply); 3164 goto unset_supplies; 3165 } 3166 } 3167 } 3168 3169 list_add(&rdev->list, ®ulator_list); 3170 3171 rdev_init_debugfs(rdev); 3172out: 3173 mutex_unlock(®ulator_list_mutex); 3174 return rdev; 3175 3176unset_supplies: 3177 unset_regulator_supplies(rdev); 3178 3179scrub: 3180 if (rdev->supply) 3181 regulator_put(rdev->supply); 3182 kfree(rdev->constraints); 3183 device_unregister(&rdev->dev); 3184 /* device core frees rdev */ 3185 rdev = ERR_PTR(ret); 3186 goto out; 3187 3188clean: 3189 kfree(rdev); 3190 rdev = ERR_PTR(ret); 3191 goto out; 3192} 3193EXPORT_SYMBOL_GPL(regulator_register); 3194 3195/** 3196 * regulator_unregister - unregister regulator 3197 * @rdev: regulator to unregister 3198 * 3199 * Called by regulator drivers to unregister a regulator. 3200 */ 3201void regulator_unregister(struct regulator_dev *rdev) 3202{ 3203 if (rdev == NULL) 3204 return; 3205 3206 if (rdev->supply) 3207 regulator_put(rdev->supply); 3208 mutex_lock(®ulator_list_mutex); 3209 debugfs_remove_recursive(rdev->debugfs); 3210 flush_work_sync(&rdev->disable_work.work); 3211 WARN_ON(rdev->open_count); 3212 unset_regulator_supplies(rdev); 3213 list_del(&rdev->list); 3214 kfree(rdev->constraints); 3215 device_unregister(&rdev->dev); 3216 mutex_unlock(®ulator_list_mutex); 3217} 3218EXPORT_SYMBOL_GPL(regulator_unregister); 3219 3220/** 3221 * regulator_suspend_prepare - prepare regulators for system wide suspend 3222 * @state: system suspend state 3223 * 3224 * Configure each regulator with it's suspend operating parameters for state. 3225 * This will usually be called by machine suspend code prior to supending. 3226 */ 3227int regulator_suspend_prepare(suspend_state_t state) 3228{ 3229 struct regulator_dev *rdev; 3230 int ret = 0; 3231 3232 /* ON is handled by regulator active state */ 3233 if (state == PM_SUSPEND_ON) 3234 return -EINVAL; 3235 3236 mutex_lock(®ulator_list_mutex); 3237 list_for_each_entry(rdev, ®ulator_list, list) { 3238 3239 mutex_lock(&rdev->mutex); 3240 ret = suspend_prepare(rdev, state); 3241 mutex_unlock(&rdev->mutex); 3242 3243 if (ret < 0) { 3244 rdev_err(rdev, "failed to prepare\n"); 3245 goto out; 3246 } 3247 } 3248out: 3249 mutex_unlock(®ulator_list_mutex); 3250 return ret; 3251} 3252EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3253 3254/** 3255 * regulator_suspend_finish - resume regulators from system wide suspend 3256 * 3257 * Turn on regulators that might be turned off by regulator_suspend_prepare 3258 * and that should be turned on according to the regulators properties. 3259 */ 3260int regulator_suspend_finish(void) 3261{ 3262 struct regulator_dev *rdev; 3263 int ret = 0, error; 3264 3265 mutex_lock(®ulator_list_mutex); 3266 list_for_each_entry(rdev, ®ulator_list, list) { 3267 struct regulator_ops *ops = rdev->desc->ops; 3268 3269 mutex_lock(&rdev->mutex); 3270 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3271 ops->enable) { 3272 error = ops->enable(rdev); 3273 if (error) 3274 ret = error; 3275 } else { 3276 if (!has_full_constraints) 3277 goto unlock; 3278 if (!ops->disable) 3279 goto unlock; 3280 if (!_regulator_is_enabled(rdev)) 3281 goto unlock; 3282 3283 error = ops->disable(rdev); 3284 if (error) 3285 ret = error; 3286 } 3287unlock: 3288 mutex_unlock(&rdev->mutex); 3289 } 3290 mutex_unlock(®ulator_list_mutex); 3291 return ret; 3292} 3293EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3294 3295/** 3296 * regulator_has_full_constraints - the system has fully specified constraints 3297 * 3298 * Calling this function will cause the regulator API to disable all 3299 * regulators which have a zero use count and don't have an always_on 3300 * constraint in a late_initcall. 3301 * 3302 * The intention is that this will become the default behaviour in a 3303 * future kernel release so users are encouraged to use this facility 3304 * now. 3305 */ 3306void regulator_has_full_constraints(void) 3307{ 3308 has_full_constraints = 1; 3309} 3310EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3311 3312/** 3313 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3314 * 3315 * Calling this function will cause the regulator API to provide a 3316 * dummy regulator to consumers if no physical regulator is found, 3317 * allowing most consumers to proceed as though a regulator were 3318 * configured. This allows systems such as those with software 3319 * controllable regulators for the CPU core only to be brought up more 3320 * readily. 3321 */ 3322void regulator_use_dummy_regulator(void) 3323{ 3324 board_wants_dummy_regulator = true; 3325} 3326EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3327 3328/** 3329 * rdev_get_drvdata - get rdev regulator driver data 3330 * @rdev: regulator 3331 * 3332 * Get rdev regulator driver private data. This call can be used in the 3333 * regulator driver context. 3334 */ 3335void *rdev_get_drvdata(struct regulator_dev *rdev) 3336{ 3337 return rdev->reg_data; 3338} 3339EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3340 3341/** 3342 * regulator_get_drvdata - get regulator driver data 3343 * @regulator: regulator 3344 * 3345 * Get regulator driver private data. This call can be used in the consumer 3346 * driver context when non API regulator specific functions need to be called. 3347 */ 3348void *regulator_get_drvdata(struct regulator *regulator) 3349{ 3350 return regulator->rdev->reg_data; 3351} 3352EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3353 3354/** 3355 * regulator_set_drvdata - set regulator driver data 3356 * @regulator: regulator 3357 * @data: data 3358 */ 3359void regulator_set_drvdata(struct regulator *regulator, void *data) 3360{ 3361 regulator->rdev->reg_data = data; 3362} 3363EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3364 3365/** 3366 * regulator_get_id - get regulator ID 3367 * @rdev: regulator 3368 */ 3369int rdev_get_id(struct regulator_dev *rdev) 3370{ 3371 return rdev->desc->id; 3372} 3373EXPORT_SYMBOL_GPL(rdev_get_id); 3374 3375struct device *rdev_get_dev(struct regulator_dev *rdev) 3376{ 3377 return &rdev->dev; 3378} 3379EXPORT_SYMBOL_GPL(rdev_get_dev); 3380 3381void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3382{ 3383 return reg_init_data->driver_data; 3384} 3385EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3386 3387#ifdef CONFIG_DEBUG_FS 3388static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3389 size_t count, loff_t *ppos) 3390{ 3391 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3392 ssize_t len, ret = 0; 3393 struct regulator_map *map; 3394 3395 if (!buf) 3396 return -ENOMEM; 3397 3398 list_for_each_entry(map, ®ulator_map_list, list) { 3399 len = snprintf(buf + ret, PAGE_SIZE - ret, 3400 "%s -> %s.%s\n", 3401 rdev_get_name(map->regulator), map->dev_name, 3402 map->supply); 3403 if (len >= 0) 3404 ret += len; 3405 if (ret > PAGE_SIZE) { 3406 ret = PAGE_SIZE; 3407 break; 3408 } 3409 } 3410 3411 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3412 3413 kfree(buf); 3414 3415 return ret; 3416} 3417#endif 3418 3419static const struct file_operations supply_map_fops = { 3420#ifdef CONFIG_DEBUG_FS 3421 .read = supply_map_read_file, 3422 .llseek = default_llseek, 3423#endif 3424}; 3425 3426static int __init regulator_init(void) 3427{ 3428 int ret; 3429 3430 ret = class_register(®ulator_class); 3431 3432 debugfs_root = debugfs_create_dir("regulator", NULL); 3433 if (!debugfs_root) 3434 pr_warn("regulator: Failed to create debugfs directory\n"); 3435 3436 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3437 &supply_map_fops); 3438 3439 regulator_dummy_init(); 3440 3441 return ret; 3442} 3443 3444/* init early to allow our consumers to complete system booting */ 3445core_initcall(regulator_init); 3446 3447static int __init regulator_init_complete(void) 3448{ 3449 struct regulator_dev *rdev; 3450 struct regulator_ops *ops; 3451 struct regulation_constraints *c; 3452 int enabled, ret; 3453 3454 mutex_lock(®ulator_list_mutex); 3455 3456 /* If we have a full configuration then disable any regulators 3457 * which are not in use or always_on. This will become the 3458 * default behaviour in the future. 3459 */ 3460 list_for_each_entry(rdev, ®ulator_list, list) { 3461 ops = rdev->desc->ops; 3462 c = rdev->constraints; 3463 3464 if (!ops->disable || (c && c->always_on)) 3465 continue; 3466 3467 mutex_lock(&rdev->mutex); 3468 3469 if (rdev->use_count) 3470 goto unlock; 3471 3472 /* If we can't read the status assume it's on. */ 3473 if (ops->is_enabled) 3474 enabled = ops->is_enabled(rdev); 3475 else 3476 enabled = 1; 3477 3478 if (!enabled) 3479 goto unlock; 3480 3481 if (has_full_constraints) { 3482 /* We log since this may kill the system if it 3483 * goes wrong. */ 3484 rdev_info(rdev, "disabling\n"); 3485 ret = ops->disable(rdev); 3486 if (ret != 0) { 3487 rdev_err(rdev, "couldn't disable: %d\n", ret); 3488 } 3489 } else { 3490 /* The intention is that in future we will 3491 * assume that full constraints are provided 3492 * so warn even if we aren't going to do 3493 * anything here. 3494 */ 3495 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3496 } 3497 3498unlock: 3499 mutex_unlock(&rdev->mutex); 3500 } 3501 3502 mutex_unlock(®ulator_list_mutex); 3503 3504 return 0; 3505} 3506late_initcall(regulator_init_complete); 3507