core.c revision a56d66a2f01b172bc00d73b0b0392423c8aaae19
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/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static LIST_HEAD(regulator_ena_gpio_list); 55static bool has_full_constraints; 56static bool board_wants_dummy_regulator; 57 58static struct dentry *debugfs_root; 59 60/* 61 * struct regulator_map 62 * 63 * Used to provide symbolic supply names to devices. 64 */ 65struct regulator_map { 66 struct list_head list; 67 const char *dev_name; /* The dev_name() for the consumer */ 68 const char *supply; 69 struct regulator_dev *regulator; 70}; 71 72/* 73 * struct regulator_enable_gpio 74 * 75 * Management for shared enable GPIO pin 76 */ 77struct regulator_enable_gpio { 78 struct list_head list; 79 int gpio; 80 u32 enable_count; /* a number of enabled shared GPIO */ 81 u32 request_count; /* a number of requested shared GPIO */ 82 unsigned int ena_gpio_invert:1; 83}; 84 85/* 86 * struct regulator 87 * 88 * One for each consumer device. 89 */ 90struct regulator { 91 struct device *dev; 92 struct list_head list; 93 unsigned int always_on:1; 94 unsigned int bypass:1; 95 int uA_load; 96 int min_uV; 97 int max_uV; 98 char *supply_name; 99 struct device_attribute dev_attr; 100 struct regulator_dev *rdev; 101 struct dentry *debugfs; 102}; 103 104static int _regulator_is_enabled(struct regulator_dev *rdev); 105static int _regulator_disable(struct regulator_dev *rdev); 106static int _regulator_get_voltage(struct regulator_dev *rdev); 107static int _regulator_get_current_limit(struct regulator_dev *rdev); 108static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 109static void _notifier_call_chain(struct regulator_dev *rdev, 110 unsigned long event, void *data); 111static int _regulator_do_set_voltage(struct regulator_dev *rdev, 112 int min_uV, int max_uV); 113static struct regulator *create_regulator(struct regulator_dev *rdev, 114 struct device *dev, 115 const char *supply_name); 116 117static const char *rdev_get_name(struct regulator_dev *rdev) 118{ 119 if (rdev->constraints && rdev->constraints->name) 120 return rdev->constraints->name; 121 else if (rdev->desc->name) 122 return rdev->desc->name; 123 else 124 return ""; 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t regulator_name_show(struct device *dev, 327 struct device_attribute *attr, char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333 334static ssize_t regulator_print_opmode(char *buf, int mode) 335{ 336 switch (mode) { 337 case REGULATOR_MODE_FAST: 338 return sprintf(buf, "fast\n"); 339 case REGULATOR_MODE_NORMAL: 340 return sprintf(buf, "normal\n"); 341 case REGULATOR_MODE_IDLE: 342 return sprintf(buf, "idle\n"); 343 case REGULATOR_MODE_STANDBY: 344 return sprintf(buf, "standby\n"); 345 } 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_opmode_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 354 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 355} 356static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 357 358static ssize_t regulator_print_state(char *buf, int state) 359{ 360 if (state > 0) 361 return sprintf(buf, "enabled\n"); 362 else if (state == 0) 363 return sprintf(buf, "disabled\n"); 364 else 365 return sprintf(buf, "unknown\n"); 366} 367 368static ssize_t regulator_state_show(struct device *dev, 369 struct device_attribute *attr, char *buf) 370{ 371 struct regulator_dev *rdev = dev_get_drvdata(dev); 372 ssize_t ret; 373 374 mutex_lock(&rdev->mutex); 375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 376 mutex_unlock(&rdev->mutex); 377 378 return ret; 379} 380static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 381 382static ssize_t regulator_status_show(struct device *dev, 383 struct device_attribute *attr, char *buf) 384{ 385 struct regulator_dev *rdev = dev_get_drvdata(dev); 386 int status; 387 char *label; 388 389 status = rdev->desc->ops->get_status(rdev); 390 if (status < 0) 391 return status; 392 393 switch (status) { 394 case REGULATOR_STATUS_OFF: 395 label = "off"; 396 break; 397 case REGULATOR_STATUS_ON: 398 label = "on"; 399 break; 400 case REGULATOR_STATUS_ERROR: 401 label = "error"; 402 break; 403 case REGULATOR_STATUS_FAST: 404 label = "fast"; 405 break; 406 case REGULATOR_STATUS_NORMAL: 407 label = "normal"; 408 break; 409 case REGULATOR_STATUS_IDLE: 410 label = "idle"; 411 break; 412 case REGULATOR_STATUS_STANDBY: 413 label = "standby"; 414 break; 415 case REGULATOR_STATUS_BYPASS: 416 label = "bypass"; 417 break; 418 case REGULATOR_STATUS_UNDEFINED: 419 label = "undefined"; 420 break; 421 default: 422 return -ERANGE; 423 } 424 425 return sprintf(buf, "%s\n", label); 426} 427static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 428 429static ssize_t regulator_min_uA_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431{ 432 struct regulator_dev *rdev = dev_get_drvdata(dev); 433 434 if (!rdev->constraints) 435 return sprintf(buf, "constraint not defined\n"); 436 437 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 438} 439static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 440 441static ssize_t regulator_max_uA_show(struct device *dev, 442 struct device_attribute *attr, char *buf) 443{ 444 struct regulator_dev *rdev = dev_get_drvdata(dev); 445 446 if (!rdev->constraints) 447 return sprintf(buf, "constraint not defined\n"); 448 449 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 450} 451static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 452 453static ssize_t regulator_min_uV_show(struct device *dev, 454 struct device_attribute *attr, char *buf) 455{ 456 struct regulator_dev *rdev = dev_get_drvdata(dev); 457 458 if (!rdev->constraints) 459 return sprintf(buf, "constraint not defined\n"); 460 461 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 462} 463static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 464 465static ssize_t regulator_max_uV_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467{ 468 struct regulator_dev *rdev = dev_get_drvdata(dev); 469 470 if (!rdev->constraints) 471 return sprintf(buf, "constraint not defined\n"); 472 473 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 474} 475static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 476 477static ssize_t regulator_total_uA_show(struct device *dev, 478 struct device_attribute *attr, char *buf) 479{ 480 struct regulator_dev *rdev = dev_get_drvdata(dev); 481 struct regulator *regulator; 482 int uA = 0; 483 484 mutex_lock(&rdev->mutex); 485 list_for_each_entry(regulator, &rdev->consumer_list, list) 486 uA += regulator->uA_load; 487 mutex_unlock(&rdev->mutex); 488 return sprintf(buf, "%d\n", uA); 489} 490static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 491 492static ssize_t regulator_num_users_show(struct device *dev, 493 struct device_attribute *attr, char *buf) 494{ 495 struct regulator_dev *rdev = dev_get_drvdata(dev); 496 return sprintf(buf, "%d\n", rdev->use_count); 497} 498 499static ssize_t regulator_type_show(struct device *dev, 500 struct device_attribute *attr, char *buf) 501{ 502 struct regulator_dev *rdev = dev_get_drvdata(dev); 503 504 switch (rdev->desc->type) { 505 case REGULATOR_VOLTAGE: 506 return sprintf(buf, "voltage\n"); 507 case REGULATOR_CURRENT: 508 return sprintf(buf, "current\n"); 509 } 510 return sprintf(buf, "unknown\n"); 511} 512 513static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 514 struct device_attribute *attr, char *buf) 515{ 516 struct regulator_dev *rdev = dev_get_drvdata(dev); 517 518 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 519} 520static DEVICE_ATTR(suspend_mem_microvolts, 0444, 521 regulator_suspend_mem_uV_show, NULL); 522 523static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 524 struct device_attribute *attr, char *buf) 525{ 526 struct regulator_dev *rdev = dev_get_drvdata(dev); 527 528 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 529} 530static DEVICE_ATTR(suspend_disk_microvolts, 0444, 531 regulator_suspend_disk_uV_show, NULL); 532 533static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 534 struct device_attribute *attr, char *buf) 535{ 536 struct regulator_dev *rdev = dev_get_drvdata(dev); 537 538 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 539} 540static DEVICE_ATTR(suspend_standby_microvolts, 0444, 541 regulator_suspend_standby_uV_show, NULL); 542 543static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545{ 546 struct regulator_dev *rdev = dev_get_drvdata(dev); 547 548 return regulator_print_opmode(buf, 549 rdev->constraints->state_mem.mode); 550} 551static DEVICE_ATTR(suspend_mem_mode, 0444, 552 regulator_suspend_mem_mode_show, NULL); 553 554static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 555 struct device_attribute *attr, char *buf) 556{ 557 struct regulator_dev *rdev = dev_get_drvdata(dev); 558 559 return regulator_print_opmode(buf, 560 rdev->constraints->state_disk.mode); 561} 562static DEVICE_ATTR(suspend_disk_mode, 0444, 563 regulator_suspend_disk_mode_show, NULL); 564 565static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 566 struct device_attribute *attr, char *buf) 567{ 568 struct regulator_dev *rdev = dev_get_drvdata(dev); 569 570 return regulator_print_opmode(buf, 571 rdev->constraints->state_standby.mode); 572} 573static DEVICE_ATTR(suspend_standby_mode, 0444, 574 regulator_suspend_standby_mode_show, NULL); 575 576static ssize_t regulator_suspend_mem_state_show(struct device *dev, 577 struct device_attribute *attr, char *buf) 578{ 579 struct regulator_dev *rdev = dev_get_drvdata(dev); 580 581 return regulator_print_state(buf, 582 rdev->constraints->state_mem.enabled); 583} 584static DEVICE_ATTR(suspend_mem_state, 0444, 585 regulator_suspend_mem_state_show, NULL); 586 587static ssize_t regulator_suspend_disk_state_show(struct device *dev, 588 struct device_attribute *attr, char *buf) 589{ 590 struct regulator_dev *rdev = dev_get_drvdata(dev); 591 592 return regulator_print_state(buf, 593 rdev->constraints->state_disk.enabled); 594} 595static DEVICE_ATTR(suspend_disk_state, 0444, 596 regulator_suspend_disk_state_show, NULL); 597 598static ssize_t regulator_suspend_standby_state_show(struct device *dev, 599 struct device_attribute *attr, char *buf) 600{ 601 struct regulator_dev *rdev = dev_get_drvdata(dev); 602 603 return regulator_print_state(buf, 604 rdev->constraints->state_standby.enabled); 605} 606static DEVICE_ATTR(suspend_standby_state, 0444, 607 regulator_suspend_standby_state_show, NULL); 608 609static ssize_t regulator_bypass_show(struct device *dev, 610 struct device_attribute *attr, char *buf) 611{ 612 struct regulator_dev *rdev = dev_get_drvdata(dev); 613 const char *report; 614 bool bypass; 615 int ret; 616 617 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 618 619 if (ret != 0) 620 report = "unknown"; 621 else if (bypass) 622 report = "enabled"; 623 else 624 report = "disabled"; 625 626 return sprintf(buf, "%s\n", report); 627} 628static DEVICE_ATTR(bypass, 0444, 629 regulator_bypass_show, NULL); 630 631/* 632 * These are the only attributes are present for all regulators. 633 * Other attributes are a function of regulator functionality. 634 */ 635static struct device_attribute regulator_dev_attrs[] = { 636 __ATTR(name, 0444, regulator_name_show, NULL), 637 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 638 __ATTR(type, 0444, regulator_type_show, NULL), 639 __ATTR_NULL, 640}; 641 642static void regulator_dev_release(struct device *dev) 643{ 644 struct regulator_dev *rdev = dev_get_drvdata(dev); 645 kfree(rdev); 646} 647 648static struct class regulator_class = { 649 .name = "regulator", 650 .dev_release = regulator_dev_release, 651 .dev_attrs = regulator_dev_attrs, 652}; 653 654/* Calculate the new optimum regulator operating mode based on the new total 655 * consumer load. All locks held by caller */ 656static void drms_uA_update(struct regulator_dev *rdev) 657{ 658 struct regulator *sibling; 659 int current_uA = 0, output_uV, input_uV, err; 660 unsigned int mode; 661 662 err = regulator_check_drms(rdev); 663 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 664 (!rdev->desc->ops->get_voltage && 665 !rdev->desc->ops->get_voltage_sel) || 666 !rdev->desc->ops->set_mode) 667 return; 668 669 /* get output voltage */ 670 output_uV = _regulator_get_voltage(rdev); 671 if (output_uV <= 0) 672 return; 673 674 /* get input voltage */ 675 input_uV = 0; 676 if (rdev->supply) 677 input_uV = regulator_get_voltage(rdev->supply); 678 if (input_uV <= 0) 679 input_uV = rdev->constraints->input_uV; 680 if (input_uV <= 0) 681 return; 682 683 /* calc total requested load */ 684 list_for_each_entry(sibling, &rdev->consumer_list, list) 685 current_uA += sibling->uA_load; 686 687 /* now get the optimum mode for our new total regulator load */ 688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 689 output_uV, current_uA); 690 691 /* check the new mode is allowed */ 692 err = regulator_mode_constrain(rdev, &mode); 693 if (err == 0) 694 rdev->desc->ops->set_mode(rdev, mode); 695} 696 697static int suspend_set_state(struct regulator_dev *rdev, 698 struct regulator_state *rstate) 699{ 700 int ret = 0; 701 702 /* If we have no suspend mode configration don't set anything; 703 * only warn if the driver implements set_suspend_voltage or 704 * set_suspend_mode callback. 705 */ 706 if (!rstate->enabled && !rstate->disabled) { 707 if (rdev->desc->ops->set_suspend_voltage || 708 rdev->desc->ops->set_suspend_mode) 709 rdev_warn(rdev, "No configuration\n"); 710 return 0; 711 } 712 713 if (rstate->enabled && rstate->disabled) { 714 rdev_err(rdev, "invalid configuration\n"); 715 return -EINVAL; 716 } 717 718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 719 ret = rdev->desc->ops->set_suspend_enable(rdev); 720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 721 ret = rdev->desc->ops->set_suspend_disable(rdev); 722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 723 ret = 0; 724 725 if (ret < 0) { 726 rdev_err(rdev, "failed to enabled/disable\n"); 727 return ret; 728 } 729 730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 732 if (ret < 0) { 733 rdev_err(rdev, "failed to set voltage\n"); 734 return ret; 735 } 736 } 737 738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 740 if (ret < 0) { 741 rdev_err(rdev, "failed to set mode\n"); 742 return ret; 743 } 744 } 745 return ret; 746} 747 748/* locks held by caller */ 749static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 750{ 751 if (!rdev->constraints) 752 return -EINVAL; 753 754 switch (state) { 755 case PM_SUSPEND_STANDBY: 756 return suspend_set_state(rdev, 757 &rdev->constraints->state_standby); 758 case PM_SUSPEND_MEM: 759 return suspend_set_state(rdev, 760 &rdev->constraints->state_mem); 761 case PM_SUSPEND_MAX: 762 return suspend_set_state(rdev, 763 &rdev->constraints->state_disk); 764 default: 765 return -EINVAL; 766 } 767} 768 769static void print_constraints(struct regulator_dev *rdev) 770{ 771 struct regulation_constraints *constraints = rdev->constraints; 772 char buf[80] = ""; 773 int count = 0; 774 int ret; 775 776 if (constraints->min_uV && constraints->max_uV) { 777 if (constraints->min_uV == constraints->max_uV) 778 count += sprintf(buf + count, "%d mV ", 779 constraints->min_uV / 1000); 780 else 781 count += sprintf(buf + count, "%d <--> %d mV ", 782 constraints->min_uV / 1000, 783 constraints->max_uV / 1000); 784 } 785 786 if (!constraints->min_uV || 787 constraints->min_uV != constraints->max_uV) { 788 ret = _regulator_get_voltage(rdev); 789 if (ret > 0) 790 count += sprintf(buf + count, "at %d mV ", ret / 1000); 791 } 792 793 if (constraints->uV_offset) 794 count += sprintf(buf, "%dmV offset ", 795 constraints->uV_offset / 1000); 796 797 if (constraints->min_uA && constraints->max_uA) { 798 if (constraints->min_uA == constraints->max_uA) 799 count += sprintf(buf + count, "%d mA ", 800 constraints->min_uA / 1000); 801 else 802 count += sprintf(buf + count, "%d <--> %d mA ", 803 constraints->min_uA / 1000, 804 constraints->max_uA / 1000); 805 } 806 807 if (!constraints->min_uA || 808 constraints->min_uA != constraints->max_uA) { 809 ret = _regulator_get_current_limit(rdev); 810 if (ret > 0) 811 count += sprintf(buf + count, "at %d mA ", ret / 1000); 812 } 813 814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 815 count += sprintf(buf + count, "fast "); 816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 817 count += sprintf(buf + count, "normal "); 818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 819 count += sprintf(buf + count, "idle "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 821 count += sprintf(buf + count, "standby"); 822 823 if (!count) 824 sprintf(buf, "no parameters"); 825 826 rdev_info(rdev, "%s\n", buf); 827 828 if ((constraints->min_uV != constraints->max_uV) && 829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 830 rdev_warn(rdev, 831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 832} 833 834static int machine_constraints_voltage(struct regulator_dev *rdev, 835 struct regulation_constraints *constraints) 836{ 837 struct regulator_ops *ops = rdev->desc->ops; 838 int ret; 839 840 /* do we need to apply the constraint voltage */ 841 if (rdev->constraints->apply_uV && 842 rdev->constraints->min_uV == rdev->constraints->max_uV) { 843 ret = _regulator_do_set_voltage(rdev, 844 rdev->constraints->min_uV, 845 rdev->constraints->max_uV); 846 if (ret < 0) { 847 rdev_err(rdev, "failed to apply %duV constraint\n", 848 rdev->constraints->min_uV); 849 return ret; 850 } 851 } 852 853 /* constrain machine-level voltage specs to fit 854 * the actual range supported by this regulator. 855 */ 856 if (ops->list_voltage && rdev->desc->n_voltages) { 857 int count = rdev->desc->n_voltages; 858 int i; 859 int min_uV = INT_MAX; 860 int max_uV = INT_MIN; 861 int cmin = constraints->min_uV; 862 int cmax = constraints->max_uV; 863 864 /* it's safe to autoconfigure fixed-voltage supplies 865 and the constraints are used by list_voltage. */ 866 if (count == 1 && !cmin) { 867 cmin = 1; 868 cmax = INT_MAX; 869 constraints->min_uV = cmin; 870 constraints->max_uV = cmax; 871 } 872 873 /* voltage constraints are optional */ 874 if ((cmin == 0) && (cmax == 0)) 875 return 0; 876 877 /* else require explicit machine-level constraints */ 878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 879 rdev_err(rdev, "invalid voltage constraints\n"); 880 return -EINVAL; 881 } 882 883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 884 for (i = 0; i < count; i++) { 885 int value; 886 887 value = ops->list_voltage(rdev, i); 888 if (value <= 0) 889 continue; 890 891 /* maybe adjust [min_uV..max_uV] */ 892 if (value >= cmin && value < min_uV) 893 min_uV = value; 894 if (value <= cmax && value > max_uV) 895 max_uV = value; 896 } 897 898 /* final: [min_uV..max_uV] valid iff constraints valid */ 899 if (max_uV < min_uV) { 900 rdev_err(rdev, 901 "unsupportable voltage constraints %u-%uuV\n", 902 min_uV, max_uV); 903 return -EINVAL; 904 } 905 906 /* use regulator's subset of machine constraints */ 907 if (constraints->min_uV < min_uV) { 908 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 909 constraints->min_uV, min_uV); 910 constraints->min_uV = min_uV; 911 } 912 if (constraints->max_uV > max_uV) { 913 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 914 constraints->max_uV, max_uV); 915 constraints->max_uV = max_uV; 916 } 917 } 918 919 return 0; 920} 921 922/** 923 * set_machine_constraints - sets regulator constraints 924 * @rdev: regulator source 925 * @constraints: constraints to apply 926 * 927 * Allows platform initialisation code to define and constrain 928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 929 * Constraints *must* be set by platform code in order for some 930 * regulator operations to proceed i.e. set_voltage, set_current_limit, 931 * set_mode. 932 */ 933static int set_machine_constraints(struct regulator_dev *rdev, 934 const struct regulation_constraints *constraints) 935{ 936 int ret = 0; 937 struct regulator_ops *ops = rdev->desc->ops; 938 939 if (constraints) 940 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 941 GFP_KERNEL); 942 else 943 rdev->constraints = kzalloc(sizeof(*constraints), 944 GFP_KERNEL); 945 if (!rdev->constraints) 946 return -ENOMEM; 947 948 ret = machine_constraints_voltage(rdev, rdev->constraints); 949 if (ret != 0) 950 goto out; 951 952 /* do we need to setup our suspend state */ 953 if (rdev->constraints->initial_state) { 954 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 955 if (ret < 0) { 956 rdev_err(rdev, "failed to set suspend state\n"); 957 goto out; 958 } 959 } 960 961 if (rdev->constraints->initial_mode) { 962 if (!ops->set_mode) { 963 rdev_err(rdev, "no set_mode operation\n"); 964 ret = -EINVAL; 965 goto out; 966 } 967 968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 969 if (ret < 0) { 970 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 971 goto out; 972 } 973 } 974 975 /* If the constraints say the regulator should be on at this point 976 * and we have control then make sure it is enabled. 977 */ 978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 979 ops->enable) { 980 ret = ops->enable(rdev); 981 if (ret < 0) { 982 rdev_err(rdev, "failed to enable\n"); 983 goto out; 984 } 985 } 986 987 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 988 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 989 if (ret < 0) { 990 rdev_err(rdev, "failed to set ramp_delay\n"); 991 goto out; 992 } 993 } 994 995 print_constraints(rdev); 996 return 0; 997out: 998 kfree(rdev->constraints); 999 rdev->constraints = NULL; 1000 return ret; 1001} 1002 1003/** 1004 * set_supply - set regulator supply regulator 1005 * @rdev: regulator name 1006 * @supply_rdev: supply regulator name 1007 * 1008 * Called by platform initialisation code to set the supply regulator for this 1009 * regulator. This ensures that a regulators supply will also be enabled by the 1010 * core if it's child is enabled. 1011 */ 1012static int set_supply(struct regulator_dev *rdev, 1013 struct regulator_dev *supply_rdev) 1014{ 1015 int err; 1016 1017 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1018 1019 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1020 if (rdev->supply == NULL) { 1021 err = -ENOMEM; 1022 return err; 1023 } 1024 supply_rdev->open_count++; 1025 1026 return 0; 1027} 1028 1029/** 1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1031 * @rdev: regulator source 1032 * @consumer_dev_name: dev_name() string for device supply applies to 1033 * @supply: symbolic name for supply 1034 * 1035 * Allows platform initialisation code to map physical regulator 1036 * sources to symbolic names for supplies for use by devices. Devices 1037 * should use these symbolic names to request regulators, avoiding the 1038 * need to provide board-specific regulator names as platform data. 1039 */ 1040static int set_consumer_device_supply(struct regulator_dev *rdev, 1041 const char *consumer_dev_name, 1042 const char *supply) 1043{ 1044 struct regulator_map *node; 1045 int has_dev; 1046 1047 if (supply == NULL) 1048 return -EINVAL; 1049 1050 if (consumer_dev_name != NULL) 1051 has_dev = 1; 1052 else 1053 has_dev = 0; 1054 1055 list_for_each_entry(node, ®ulator_map_list, list) { 1056 if (node->dev_name && consumer_dev_name) { 1057 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1058 continue; 1059 } else if (node->dev_name || consumer_dev_name) { 1060 continue; 1061 } 1062 1063 if (strcmp(node->supply, supply) != 0) 1064 continue; 1065 1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1067 consumer_dev_name, 1068 dev_name(&node->regulator->dev), 1069 node->regulator->desc->name, 1070 supply, 1071 dev_name(&rdev->dev), rdev_get_name(rdev)); 1072 return -EBUSY; 1073 } 1074 1075 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1076 if (node == NULL) 1077 return -ENOMEM; 1078 1079 node->regulator = rdev; 1080 node->supply = supply; 1081 1082 if (has_dev) { 1083 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1084 if (node->dev_name == NULL) { 1085 kfree(node); 1086 return -ENOMEM; 1087 } 1088 } 1089 1090 list_add(&node->list, ®ulator_map_list); 1091 return 0; 1092} 1093 1094static void unset_regulator_supplies(struct regulator_dev *rdev) 1095{ 1096 struct regulator_map *node, *n; 1097 1098 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1099 if (rdev == node->regulator) { 1100 list_del(&node->list); 1101 kfree(node->dev_name); 1102 kfree(node); 1103 } 1104 } 1105} 1106 1107#define REG_STR_SIZE 64 1108 1109static struct regulator *create_regulator(struct regulator_dev *rdev, 1110 struct device *dev, 1111 const char *supply_name) 1112{ 1113 struct regulator *regulator; 1114 char buf[REG_STR_SIZE]; 1115 int err, size; 1116 1117 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1118 if (regulator == NULL) 1119 return NULL; 1120 1121 mutex_lock(&rdev->mutex); 1122 regulator->rdev = rdev; 1123 list_add(®ulator->list, &rdev->consumer_list); 1124 1125 if (dev) { 1126 regulator->dev = dev; 1127 1128 /* Add a link to the device sysfs entry */ 1129 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1130 dev->kobj.name, supply_name); 1131 if (size >= REG_STR_SIZE) 1132 goto overflow_err; 1133 1134 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1135 if (regulator->supply_name == NULL) 1136 goto overflow_err; 1137 1138 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1139 buf); 1140 if (err) { 1141 rdev_warn(rdev, "could not add device link %s err %d\n", 1142 dev->kobj.name, err); 1143 /* non-fatal */ 1144 } 1145 } else { 1146 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1147 if (regulator->supply_name == NULL) 1148 goto overflow_err; 1149 } 1150 1151 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1152 rdev->debugfs); 1153 if (!regulator->debugfs) { 1154 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1155 } else { 1156 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1157 ®ulator->uA_load); 1158 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1159 ®ulator->min_uV); 1160 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1161 ®ulator->max_uV); 1162 } 1163 1164 /* 1165 * Check now if the regulator is an always on regulator - if 1166 * it is then we don't need to do nearly so much work for 1167 * enable/disable calls. 1168 */ 1169 if (!_regulator_can_change_status(rdev) && 1170 _regulator_is_enabled(rdev)) 1171 regulator->always_on = true; 1172 1173 mutex_unlock(&rdev->mutex); 1174 return regulator; 1175overflow_err: 1176 list_del(®ulator->list); 1177 kfree(regulator); 1178 mutex_unlock(&rdev->mutex); 1179 return NULL; 1180} 1181 1182static int _regulator_get_enable_time(struct regulator_dev *rdev) 1183{ 1184 if (!rdev->desc->ops->enable_time) 1185 return rdev->desc->enable_time; 1186 return rdev->desc->ops->enable_time(rdev); 1187} 1188 1189static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1190 const char *supply, 1191 int *ret) 1192{ 1193 struct regulator_dev *r; 1194 struct device_node *node; 1195 struct regulator_map *map; 1196 const char *devname = NULL; 1197 1198 /* first do a dt based lookup */ 1199 if (dev && dev->of_node) { 1200 node = of_get_regulator(dev, supply); 1201 if (node) { 1202 list_for_each_entry(r, ®ulator_list, list) 1203 if (r->dev.parent && 1204 node == r->dev.of_node) 1205 return r; 1206 } else { 1207 /* 1208 * If we couldn't even get the node then it's 1209 * not just that the device didn't register 1210 * yet, there's no node and we'll never 1211 * succeed. 1212 */ 1213 *ret = -ENODEV; 1214 } 1215 } 1216 1217 /* if not found, try doing it non-dt way */ 1218 if (dev) 1219 devname = dev_name(dev); 1220 1221 list_for_each_entry(r, ®ulator_list, list) 1222 if (strcmp(rdev_get_name(r), supply) == 0) 1223 return r; 1224 1225 list_for_each_entry(map, ®ulator_map_list, list) { 1226 /* If the mapping has a device set up it must match */ 1227 if (map->dev_name && 1228 (!devname || strcmp(map->dev_name, devname))) 1229 continue; 1230 1231 if (strcmp(map->supply, supply) == 0) 1232 return map->regulator; 1233 } 1234 1235 1236 return NULL; 1237} 1238 1239/* Internal regulator request function */ 1240static struct regulator *_regulator_get(struct device *dev, const char *id, 1241 int exclusive) 1242{ 1243 struct regulator_dev *rdev; 1244 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1245 const char *devname = NULL; 1246 int ret = 0; 1247 1248 if (id == NULL) { 1249 pr_err("get() with no identifier\n"); 1250 return regulator; 1251 } 1252 1253 if (dev) 1254 devname = dev_name(dev); 1255 1256 mutex_lock(®ulator_list_mutex); 1257 1258 rdev = regulator_dev_lookup(dev, id, &ret); 1259 if (rdev) 1260 goto found; 1261 1262 /* 1263 * If we have return value from dev_lookup fail, we do not expect to 1264 * succeed, so, quit with appropriate error value 1265 */ 1266 if (ret) { 1267 regulator = ERR_PTR(ret); 1268 goto out; 1269 } 1270 1271 if (board_wants_dummy_regulator) { 1272 rdev = dummy_regulator_rdev; 1273 goto found; 1274 } 1275 1276#ifdef CONFIG_REGULATOR_DUMMY 1277 if (!devname) 1278 devname = "deviceless"; 1279 1280 /* If the board didn't flag that it was fully constrained then 1281 * substitute in a dummy regulator so consumers can continue. 1282 */ 1283 if (!has_full_constraints) { 1284 pr_warn("%s supply %s not found, using dummy regulator\n", 1285 devname, id); 1286 rdev = dummy_regulator_rdev; 1287 goto found; 1288 } 1289#endif 1290 1291 mutex_unlock(®ulator_list_mutex); 1292 return regulator; 1293 1294found: 1295 if (rdev->exclusive) { 1296 regulator = ERR_PTR(-EPERM); 1297 goto out; 1298 } 1299 1300 if (exclusive && rdev->open_count) { 1301 regulator = ERR_PTR(-EBUSY); 1302 goto out; 1303 } 1304 1305 if (!try_module_get(rdev->owner)) 1306 goto out; 1307 1308 regulator = create_regulator(rdev, dev, id); 1309 if (regulator == NULL) { 1310 regulator = ERR_PTR(-ENOMEM); 1311 module_put(rdev->owner); 1312 goto out; 1313 } 1314 1315 rdev->open_count++; 1316 if (exclusive) { 1317 rdev->exclusive = 1; 1318 1319 ret = _regulator_is_enabled(rdev); 1320 if (ret > 0) 1321 rdev->use_count = 1; 1322 else 1323 rdev->use_count = 0; 1324 } 1325 1326out: 1327 mutex_unlock(®ulator_list_mutex); 1328 1329 return regulator; 1330} 1331 1332/** 1333 * regulator_get - lookup and obtain a reference to a regulator. 1334 * @dev: device for regulator "consumer" 1335 * @id: Supply name or regulator ID. 1336 * 1337 * Returns a struct regulator corresponding to the regulator producer, 1338 * or IS_ERR() condition containing errno. 1339 * 1340 * Use of supply names configured via regulator_set_device_supply() is 1341 * strongly encouraged. It is recommended that the supply name used 1342 * should match the name used for the supply and/or the relevant 1343 * device pins in the datasheet. 1344 */ 1345struct regulator *regulator_get(struct device *dev, const char *id) 1346{ 1347 return _regulator_get(dev, id, 0); 1348} 1349EXPORT_SYMBOL_GPL(regulator_get); 1350 1351static void devm_regulator_release(struct device *dev, void *res) 1352{ 1353 regulator_put(*(struct regulator **)res); 1354} 1355 1356/** 1357 * devm_regulator_get - Resource managed regulator_get() 1358 * @dev: device for regulator "consumer" 1359 * @id: Supply name or regulator ID. 1360 * 1361 * Managed regulator_get(). Regulators returned from this function are 1362 * automatically regulator_put() on driver detach. See regulator_get() for more 1363 * information. 1364 */ 1365struct regulator *devm_regulator_get(struct device *dev, const char *id) 1366{ 1367 struct regulator **ptr, *regulator; 1368 1369 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1370 if (!ptr) 1371 return ERR_PTR(-ENOMEM); 1372 1373 regulator = regulator_get(dev, id); 1374 if (!IS_ERR(regulator)) { 1375 *ptr = regulator; 1376 devres_add(dev, ptr); 1377 } else { 1378 devres_free(ptr); 1379 } 1380 1381 return regulator; 1382} 1383EXPORT_SYMBOL_GPL(devm_regulator_get); 1384 1385/** 1386 * regulator_get_exclusive - obtain exclusive access to a regulator. 1387 * @dev: device for regulator "consumer" 1388 * @id: Supply name or regulator ID. 1389 * 1390 * Returns a struct regulator corresponding to the regulator producer, 1391 * or IS_ERR() condition containing errno. Other consumers will be 1392 * unable to obtain this reference is held and the use count for the 1393 * regulator will be initialised to reflect the current state of the 1394 * regulator. 1395 * 1396 * This is intended for use by consumers which cannot tolerate shared 1397 * use of the regulator such as those which need to force the 1398 * regulator off for correct operation of the hardware they are 1399 * controlling. 1400 * 1401 * Use of supply names configured via regulator_set_device_supply() is 1402 * strongly encouraged. It is recommended that the supply name used 1403 * should match the name used for the supply and/or the relevant 1404 * device pins in the datasheet. 1405 */ 1406struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1407{ 1408 return _regulator_get(dev, id, 1); 1409} 1410EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1411 1412/* Locks held by regulator_put() */ 1413static void _regulator_put(struct regulator *regulator) 1414{ 1415 struct regulator_dev *rdev; 1416 1417 if (regulator == NULL || IS_ERR(regulator)) 1418 return; 1419 1420 rdev = regulator->rdev; 1421 1422 debugfs_remove_recursive(regulator->debugfs); 1423 1424 /* remove any sysfs entries */ 1425 if (regulator->dev) 1426 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1427 kfree(regulator->supply_name); 1428 list_del(®ulator->list); 1429 kfree(regulator); 1430 1431 rdev->open_count--; 1432 rdev->exclusive = 0; 1433 1434 module_put(rdev->owner); 1435} 1436 1437/** 1438 * regulator_put - "free" the regulator source 1439 * @regulator: regulator source 1440 * 1441 * Note: drivers must ensure that all regulator_enable calls made on this 1442 * regulator source are balanced by regulator_disable calls prior to calling 1443 * this function. 1444 */ 1445void regulator_put(struct regulator *regulator) 1446{ 1447 mutex_lock(®ulator_list_mutex); 1448 _regulator_put(regulator); 1449 mutex_unlock(®ulator_list_mutex); 1450} 1451EXPORT_SYMBOL_GPL(regulator_put); 1452 1453static int devm_regulator_match(struct device *dev, void *res, void *data) 1454{ 1455 struct regulator **r = res; 1456 if (!r || !*r) { 1457 WARN_ON(!r || !*r); 1458 return 0; 1459 } 1460 return *r == data; 1461} 1462 1463/** 1464 * devm_regulator_put - Resource managed regulator_put() 1465 * @regulator: regulator to free 1466 * 1467 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1468 * this function will not need to be called and the resource management 1469 * code will ensure that the resource is freed. 1470 */ 1471void devm_regulator_put(struct regulator *regulator) 1472{ 1473 int rc; 1474 1475 rc = devres_release(regulator->dev, devm_regulator_release, 1476 devm_regulator_match, regulator); 1477 if (rc != 0) 1478 WARN_ON(rc); 1479} 1480EXPORT_SYMBOL_GPL(devm_regulator_put); 1481 1482/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1483static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1484 const struct regulator_config *config) 1485{ 1486 struct regulator_enable_gpio *pin; 1487 int ret; 1488 1489 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1490 if (pin->gpio == config->ena_gpio) { 1491 rdev_dbg(rdev, "GPIO %d is already used\n", 1492 config->ena_gpio); 1493 goto update_ena_gpio_to_rdev; 1494 } 1495 } 1496 1497 ret = gpio_request_one(config->ena_gpio, 1498 GPIOF_DIR_OUT | config->ena_gpio_flags, 1499 rdev_get_name(rdev)); 1500 if (ret) 1501 return ret; 1502 1503 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1504 if (pin == NULL) { 1505 gpio_free(config->ena_gpio); 1506 return -ENOMEM; 1507 } 1508 1509 pin->gpio = config->ena_gpio; 1510 pin->ena_gpio_invert = config->ena_gpio_invert; 1511 list_add(&pin->list, ®ulator_ena_gpio_list); 1512 1513update_ena_gpio_to_rdev: 1514 pin->request_count++; 1515 rdev->ena_pin = pin; 1516 return 0; 1517} 1518 1519static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1520{ 1521 struct regulator_enable_gpio *pin, *n; 1522 1523 if (!rdev->ena_pin) 1524 return; 1525 1526 /* Free the GPIO only in case of no use */ 1527 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1528 if (pin->gpio == rdev->ena_pin->gpio) { 1529 if (pin->request_count <= 1) { 1530 pin->request_count = 0; 1531 gpio_free(pin->gpio); 1532 list_del(&pin->list); 1533 kfree(pin); 1534 } else { 1535 pin->request_count--; 1536 } 1537 } 1538 } 1539} 1540 1541/** 1542 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1543 * @rdev: regulator_dev structure 1544 * @enable: enable GPIO at initial use? 1545 * 1546 * GPIO is enabled in case of initial use. (enable_count is 0) 1547 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1548 */ 1549static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1550{ 1551 struct regulator_enable_gpio *pin = rdev->ena_pin; 1552 1553 if (!pin) 1554 return -EINVAL; 1555 1556 if (enable) { 1557 /* Enable GPIO at initial use */ 1558 if (pin->enable_count == 0) 1559 gpio_set_value_cansleep(pin->gpio, 1560 !pin->ena_gpio_invert); 1561 1562 pin->enable_count++; 1563 } else { 1564 if (pin->enable_count > 1) { 1565 pin->enable_count--; 1566 return 0; 1567 } 1568 1569 /* Disable GPIO if not used */ 1570 if (pin->enable_count <= 1) { 1571 gpio_set_value_cansleep(pin->gpio, 1572 pin->ena_gpio_invert); 1573 pin->enable_count = 0; 1574 } 1575 } 1576 1577 return 0; 1578} 1579 1580static int _regulator_do_enable(struct regulator_dev *rdev) 1581{ 1582 int ret, delay; 1583 1584 /* Query before enabling in case configuration dependent. */ 1585 ret = _regulator_get_enable_time(rdev); 1586 if (ret >= 0) { 1587 delay = ret; 1588 } else { 1589 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1590 delay = 0; 1591 } 1592 1593 trace_regulator_enable(rdev_get_name(rdev)); 1594 1595 if (rdev->ena_pin) { 1596 ret = regulator_ena_gpio_ctrl(rdev, true); 1597 if (ret < 0) 1598 return ret; 1599 rdev->ena_gpio_state = 1; 1600 } else if (rdev->desc->ops->enable) { 1601 ret = rdev->desc->ops->enable(rdev); 1602 if (ret < 0) 1603 return ret; 1604 } else { 1605 return -EINVAL; 1606 } 1607 1608 /* Allow the regulator to ramp; it would be useful to extend 1609 * this for bulk operations so that the regulators can ramp 1610 * together. */ 1611 trace_regulator_enable_delay(rdev_get_name(rdev)); 1612 1613 if (delay >= 1000) { 1614 mdelay(delay / 1000); 1615 udelay(delay % 1000); 1616 } else if (delay) { 1617 udelay(delay); 1618 } 1619 1620 trace_regulator_enable_complete(rdev_get_name(rdev)); 1621 1622 return 0; 1623} 1624 1625/* locks held by regulator_enable() */ 1626static int _regulator_enable(struct regulator_dev *rdev) 1627{ 1628 int ret; 1629 1630 /* check voltage and requested load before enabling */ 1631 if (rdev->constraints && 1632 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1633 drms_uA_update(rdev); 1634 1635 if (rdev->use_count == 0) { 1636 /* The regulator may on if it's not switchable or left on */ 1637 ret = _regulator_is_enabled(rdev); 1638 if (ret == -EINVAL || ret == 0) { 1639 if (!_regulator_can_change_status(rdev)) 1640 return -EPERM; 1641 1642 ret = _regulator_do_enable(rdev); 1643 if (ret < 0) 1644 return ret; 1645 1646 } else if (ret < 0) { 1647 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1648 return ret; 1649 } 1650 /* Fallthrough on positive return values - already enabled */ 1651 } 1652 1653 rdev->use_count++; 1654 1655 return 0; 1656} 1657 1658/** 1659 * regulator_enable - enable regulator output 1660 * @regulator: regulator source 1661 * 1662 * Request that the regulator be enabled with the regulator output at 1663 * the predefined voltage or current value. Calls to regulator_enable() 1664 * must be balanced with calls to regulator_disable(). 1665 * 1666 * NOTE: the output value can be set by other drivers, boot loader or may be 1667 * hardwired in the regulator. 1668 */ 1669int regulator_enable(struct regulator *regulator) 1670{ 1671 struct regulator_dev *rdev = regulator->rdev; 1672 int ret = 0; 1673 1674 if (regulator->always_on) 1675 return 0; 1676 1677 if (rdev->supply) { 1678 ret = regulator_enable(rdev->supply); 1679 if (ret != 0) 1680 return ret; 1681 } 1682 1683 mutex_lock(&rdev->mutex); 1684 ret = _regulator_enable(rdev); 1685 mutex_unlock(&rdev->mutex); 1686 1687 if (ret != 0 && rdev->supply) 1688 regulator_disable(rdev->supply); 1689 1690 return ret; 1691} 1692EXPORT_SYMBOL_GPL(regulator_enable); 1693 1694static int _regulator_do_disable(struct regulator_dev *rdev) 1695{ 1696 int ret; 1697 1698 trace_regulator_disable(rdev_get_name(rdev)); 1699 1700 if (rdev->ena_pin) { 1701 ret = regulator_ena_gpio_ctrl(rdev, false); 1702 if (ret < 0) 1703 return ret; 1704 rdev->ena_gpio_state = 0; 1705 1706 } else if (rdev->desc->ops->disable) { 1707 ret = rdev->desc->ops->disable(rdev); 1708 if (ret != 0) 1709 return ret; 1710 } 1711 1712 trace_regulator_disable_complete(rdev_get_name(rdev)); 1713 1714 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1715 NULL); 1716 return 0; 1717} 1718 1719/* locks held by regulator_disable() */ 1720static int _regulator_disable(struct regulator_dev *rdev) 1721{ 1722 int ret = 0; 1723 1724 if (WARN(rdev->use_count <= 0, 1725 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1726 return -EIO; 1727 1728 /* are we the last user and permitted to disable ? */ 1729 if (rdev->use_count == 1 && 1730 (rdev->constraints && !rdev->constraints->always_on)) { 1731 1732 /* we are last user */ 1733 if (_regulator_can_change_status(rdev)) { 1734 ret = _regulator_do_disable(rdev); 1735 if (ret < 0) { 1736 rdev_err(rdev, "failed to disable\n"); 1737 return ret; 1738 } 1739 } 1740 1741 rdev->use_count = 0; 1742 } else if (rdev->use_count > 1) { 1743 1744 if (rdev->constraints && 1745 (rdev->constraints->valid_ops_mask & 1746 REGULATOR_CHANGE_DRMS)) 1747 drms_uA_update(rdev); 1748 1749 rdev->use_count--; 1750 } 1751 1752 return ret; 1753} 1754 1755/** 1756 * regulator_disable - disable regulator output 1757 * @regulator: regulator source 1758 * 1759 * Disable the regulator output voltage or current. Calls to 1760 * regulator_enable() must be balanced with calls to 1761 * regulator_disable(). 1762 * 1763 * NOTE: this will only disable the regulator output if no other consumer 1764 * devices have it enabled, the regulator device supports disabling and 1765 * machine constraints permit this operation. 1766 */ 1767int regulator_disable(struct regulator *regulator) 1768{ 1769 struct regulator_dev *rdev = regulator->rdev; 1770 int ret = 0; 1771 1772 if (regulator->always_on) 1773 return 0; 1774 1775 mutex_lock(&rdev->mutex); 1776 ret = _regulator_disable(rdev); 1777 mutex_unlock(&rdev->mutex); 1778 1779 if (ret == 0 && rdev->supply) 1780 regulator_disable(rdev->supply); 1781 1782 return ret; 1783} 1784EXPORT_SYMBOL_GPL(regulator_disable); 1785 1786/* locks held by regulator_force_disable() */ 1787static int _regulator_force_disable(struct regulator_dev *rdev) 1788{ 1789 int ret = 0; 1790 1791 /* force disable */ 1792 if (rdev->desc->ops->disable) { 1793 /* ah well, who wants to live forever... */ 1794 ret = rdev->desc->ops->disable(rdev); 1795 if (ret < 0) { 1796 rdev_err(rdev, "failed to force disable\n"); 1797 return ret; 1798 } 1799 /* notify other consumers that power has been forced off */ 1800 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1801 REGULATOR_EVENT_DISABLE, NULL); 1802 } 1803 1804 return ret; 1805} 1806 1807/** 1808 * regulator_force_disable - force disable regulator output 1809 * @regulator: regulator source 1810 * 1811 * Forcibly disable the regulator output voltage or current. 1812 * NOTE: this *will* disable the regulator output even if other consumer 1813 * devices have it enabled. This should be used for situations when device 1814 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1815 */ 1816int regulator_force_disable(struct regulator *regulator) 1817{ 1818 struct regulator_dev *rdev = regulator->rdev; 1819 int ret; 1820 1821 mutex_lock(&rdev->mutex); 1822 regulator->uA_load = 0; 1823 ret = _regulator_force_disable(regulator->rdev); 1824 mutex_unlock(&rdev->mutex); 1825 1826 if (rdev->supply) 1827 while (rdev->open_count--) 1828 regulator_disable(rdev->supply); 1829 1830 return ret; 1831} 1832EXPORT_SYMBOL_GPL(regulator_force_disable); 1833 1834static void regulator_disable_work(struct work_struct *work) 1835{ 1836 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1837 disable_work.work); 1838 int count, i, ret; 1839 1840 mutex_lock(&rdev->mutex); 1841 1842 BUG_ON(!rdev->deferred_disables); 1843 1844 count = rdev->deferred_disables; 1845 rdev->deferred_disables = 0; 1846 1847 for (i = 0; i < count; i++) { 1848 ret = _regulator_disable(rdev); 1849 if (ret != 0) 1850 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1851 } 1852 1853 mutex_unlock(&rdev->mutex); 1854 1855 if (rdev->supply) { 1856 for (i = 0; i < count; i++) { 1857 ret = regulator_disable(rdev->supply); 1858 if (ret != 0) { 1859 rdev_err(rdev, 1860 "Supply disable failed: %d\n", ret); 1861 } 1862 } 1863 } 1864} 1865 1866/** 1867 * regulator_disable_deferred - disable regulator output with delay 1868 * @regulator: regulator source 1869 * @ms: miliseconds until the regulator is disabled 1870 * 1871 * Execute regulator_disable() on the regulator after a delay. This 1872 * is intended for use with devices that require some time to quiesce. 1873 * 1874 * NOTE: this will only disable the regulator output if no other consumer 1875 * devices have it enabled, the regulator device supports disabling and 1876 * machine constraints permit this operation. 1877 */ 1878int regulator_disable_deferred(struct regulator *regulator, int ms) 1879{ 1880 struct regulator_dev *rdev = regulator->rdev; 1881 int ret; 1882 1883 if (regulator->always_on) 1884 return 0; 1885 1886 if (!ms) 1887 return regulator_disable(regulator); 1888 1889 mutex_lock(&rdev->mutex); 1890 rdev->deferred_disables++; 1891 mutex_unlock(&rdev->mutex); 1892 1893 ret = schedule_delayed_work(&rdev->disable_work, 1894 msecs_to_jiffies(ms)); 1895 if (ret < 0) 1896 return ret; 1897 else 1898 return 0; 1899} 1900EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1901 1902/** 1903 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1904 * 1905 * @rdev: regulator to operate on 1906 * 1907 * Regulators that use regmap for their register I/O can set the 1908 * enable_reg and enable_mask fields in their descriptor and then use 1909 * this as their is_enabled operation, saving some code. 1910 */ 1911int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1912{ 1913 unsigned int val; 1914 int ret; 1915 1916 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1917 if (ret != 0) 1918 return ret; 1919 1920 if (rdev->desc->enable_is_inverted) 1921 return (val & rdev->desc->enable_mask) == 0; 1922 else 1923 return (val & rdev->desc->enable_mask) != 0; 1924} 1925EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1926 1927/** 1928 * regulator_enable_regmap - standard enable() for regmap users 1929 * 1930 * @rdev: regulator to operate on 1931 * 1932 * Regulators that use regmap for their register I/O can set the 1933 * enable_reg and enable_mask fields in their descriptor and then use 1934 * this as their enable() operation, saving some code. 1935 */ 1936int regulator_enable_regmap(struct regulator_dev *rdev) 1937{ 1938 unsigned int val; 1939 1940 if (rdev->desc->enable_is_inverted) 1941 val = 0; 1942 else 1943 val = rdev->desc->enable_mask; 1944 1945 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1946 rdev->desc->enable_mask, val); 1947} 1948EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1949 1950/** 1951 * regulator_disable_regmap - standard disable() for regmap users 1952 * 1953 * @rdev: regulator to operate on 1954 * 1955 * Regulators that use regmap for their register I/O can set the 1956 * enable_reg and enable_mask fields in their descriptor and then use 1957 * this as their disable() operation, saving some code. 1958 */ 1959int regulator_disable_regmap(struct regulator_dev *rdev) 1960{ 1961 unsigned int val; 1962 1963 if (rdev->desc->enable_is_inverted) 1964 val = rdev->desc->enable_mask; 1965 else 1966 val = 0; 1967 1968 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1969 rdev->desc->enable_mask, val); 1970} 1971EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1972 1973static int _regulator_is_enabled(struct regulator_dev *rdev) 1974{ 1975 /* A GPIO control always takes precedence */ 1976 if (rdev->ena_pin) 1977 return rdev->ena_gpio_state; 1978 1979 /* If we don't know then assume that the regulator is always on */ 1980 if (!rdev->desc->ops->is_enabled) 1981 return 1; 1982 1983 return rdev->desc->ops->is_enabled(rdev); 1984} 1985 1986/** 1987 * regulator_is_enabled - is the regulator output enabled 1988 * @regulator: regulator source 1989 * 1990 * Returns positive if the regulator driver backing the source/client 1991 * has requested that the device be enabled, zero if it hasn't, else a 1992 * negative errno code. 1993 * 1994 * Note that the device backing this regulator handle can have multiple 1995 * users, so it might be enabled even if regulator_enable() was never 1996 * called for this particular source. 1997 */ 1998int regulator_is_enabled(struct regulator *regulator) 1999{ 2000 int ret; 2001 2002 if (regulator->always_on) 2003 return 1; 2004 2005 mutex_lock(®ulator->rdev->mutex); 2006 ret = _regulator_is_enabled(regulator->rdev); 2007 mutex_unlock(®ulator->rdev->mutex); 2008 2009 return ret; 2010} 2011EXPORT_SYMBOL_GPL(regulator_is_enabled); 2012 2013/** 2014 * regulator_can_change_voltage - check if regulator can change voltage 2015 * @regulator: regulator source 2016 * 2017 * Returns positive if the regulator driver backing the source/client 2018 * can change its voltage, false otherwise. Usefull for detecting fixed 2019 * or dummy regulators and disabling voltage change logic in the client 2020 * driver. 2021 */ 2022int regulator_can_change_voltage(struct regulator *regulator) 2023{ 2024 struct regulator_dev *rdev = regulator->rdev; 2025 2026 if (rdev->constraints && 2027 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2028 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2029 return 1; 2030 2031 if (rdev->desc->continuous_voltage_range && 2032 rdev->constraints->min_uV && rdev->constraints->max_uV && 2033 rdev->constraints->min_uV != rdev->constraints->max_uV) 2034 return 1; 2035 } 2036 2037 return 0; 2038} 2039EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2040 2041/** 2042 * regulator_count_voltages - count regulator_list_voltage() selectors 2043 * @regulator: regulator source 2044 * 2045 * Returns number of selectors, or negative errno. Selectors are 2046 * numbered starting at zero, and typically correspond to bitfields 2047 * in hardware registers. 2048 */ 2049int regulator_count_voltages(struct regulator *regulator) 2050{ 2051 struct regulator_dev *rdev = regulator->rdev; 2052 2053 return rdev->desc->n_voltages ? : -EINVAL; 2054} 2055EXPORT_SYMBOL_GPL(regulator_count_voltages); 2056 2057/** 2058 * regulator_list_voltage_linear - List voltages with simple calculation 2059 * 2060 * @rdev: Regulator device 2061 * @selector: Selector to convert into a voltage 2062 * 2063 * Regulators with a simple linear mapping between voltages and 2064 * selectors can set min_uV and uV_step in the regulator descriptor 2065 * and then use this function as their list_voltage() operation, 2066 */ 2067int regulator_list_voltage_linear(struct regulator_dev *rdev, 2068 unsigned int selector) 2069{ 2070 if (selector >= rdev->desc->n_voltages) 2071 return -EINVAL; 2072 if (selector < rdev->desc->linear_min_sel) 2073 return 0; 2074 2075 selector -= rdev->desc->linear_min_sel; 2076 2077 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 2078} 2079EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 2080 2081/** 2082 * regulator_list_voltage_linear_range - List voltages for linear ranges 2083 * 2084 * @rdev: Regulator device 2085 * @selector: Selector to convert into a voltage 2086 * 2087 * Regulators with a series of simple linear mappings between voltages 2088 * and selectors can set linear_ranges in the regulator descriptor and 2089 * then use this function as their list_voltage() operation, 2090 */ 2091int regulator_list_voltage_linear_range(struct regulator_dev *rdev, 2092 unsigned int selector) 2093{ 2094 const struct regulator_linear_range *range; 2095 int i; 2096 2097 if (!rdev->desc->n_linear_ranges) { 2098 BUG_ON(!rdev->desc->n_linear_ranges); 2099 return -EINVAL; 2100 } 2101 2102 for (i = 0; i < rdev->desc->n_linear_ranges; i++) { 2103 range = &rdev->desc->linear_ranges[i]; 2104 2105 if (!(selector >= range->min_sel && 2106 selector <= range->max_sel)) 2107 continue; 2108 2109 selector -= range->min_sel; 2110 2111 return range->min_uV + (range->uV_step * selector); 2112 } 2113 2114 return -EINVAL; 2115} 2116EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range); 2117 2118/** 2119 * regulator_list_voltage_table - List voltages with table based mapping 2120 * 2121 * @rdev: Regulator device 2122 * @selector: Selector to convert into a voltage 2123 * 2124 * Regulators with table based mapping between voltages and 2125 * selectors can set volt_table in the regulator descriptor 2126 * and then use this function as their list_voltage() operation. 2127 */ 2128int regulator_list_voltage_table(struct regulator_dev *rdev, 2129 unsigned int selector) 2130{ 2131 if (!rdev->desc->volt_table) { 2132 BUG_ON(!rdev->desc->volt_table); 2133 return -EINVAL; 2134 } 2135 2136 if (selector >= rdev->desc->n_voltages) 2137 return -EINVAL; 2138 2139 return rdev->desc->volt_table[selector]; 2140} 2141EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 2142 2143/** 2144 * regulator_list_voltage - enumerate supported voltages 2145 * @regulator: regulator source 2146 * @selector: identify voltage to list 2147 * Context: can sleep 2148 * 2149 * Returns a voltage that can be passed to @regulator_set_voltage(), 2150 * zero if this selector code can't be used on this system, or a 2151 * negative errno. 2152 */ 2153int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2154{ 2155 struct regulator_dev *rdev = regulator->rdev; 2156 struct regulator_ops *ops = rdev->desc->ops; 2157 int ret; 2158 2159 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2160 return -EINVAL; 2161 2162 mutex_lock(&rdev->mutex); 2163 ret = ops->list_voltage(rdev, selector); 2164 mutex_unlock(&rdev->mutex); 2165 2166 if (ret > 0) { 2167 if (ret < rdev->constraints->min_uV) 2168 ret = 0; 2169 else if (ret > rdev->constraints->max_uV) 2170 ret = 0; 2171 } 2172 2173 return ret; 2174} 2175EXPORT_SYMBOL_GPL(regulator_list_voltage); 2176 2177/** 2178 * regulator_get_linear_step - return the voltage step size between VSEL values 2179 * @regulator: regulator source 2180 * 2181 * Returns the voltage step size between VSEL values for linear 2182 * regulators, or return 0 if the regulator isn't a linear regulator. 2183 */ 2184unsigned int regulator_get_linear_step(struct regulator *regulator) 2185{ 2186 struct regulator_dev *rdev = regulator->rdev; 2187 2188 return rdev->desc->uV_step; 2189} 2190EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2191 2192/** 2193 * regulator_is_supported_voltage - check if a voltage range can be supported 2194 * 2195 * @regulator: Regulator to check. 2196 * @min_uV: Minimum required voltage in uV. 2197 * @max_uV: Maximum required voltage in uV. 2198 * 2199 * Returns a boolean or a negative error code. 2200 */ 2201int regulator_is_supported_voltage(struct regulator *regulator, 2202 int min_uV, int max_uV) 2203{ 2204 struct regulator_dev *rdev = regulator->rdev; 2205 int i, voltages, ret; 2206 2207 /* If we can't change voltage check the current voltage */ 2208 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2209 ret = regulator_get_voltage(regulator); 2210 if (ret >= 0) 2211 return (min_uV <= ret && ret <= max_uV); 2212 else 2213 return ret; 2214 } 2215 2216 /* Any voltage within constrains range is fine? */ 2217 if (rdev->desc->continuous_voltage_range) 2218 return min_uV >= rdev->constraints->min_uV && 2219 max_uV <= rdev->constraints->max_uV; 2220 2221 ret = regulator_count_voltages(regulator); 2222 if (ret < 0) 2223 return ret; 2224 voltages = ret; 2225 2226 for (i = 0; i < voltages; i++) { 2227 ret = regulator_list_voltage(regulator, i); 2228 2229 if (ret >= min_uV && ret <= max_uV) 2230 return 1; 2231 } 2232 2233 return 0; 2234} 2235EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2236 2237/** 2238 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2239 * 2240 * @rdev: regulator to operate on 2241 * 2242 * Regulators that use regmap for their register I/O can set the 2243 * vsel_reg and vsel_mask fields in their descriptor and then use this 2244 * as their get_voltage_vsel operation, saving some code. 2245 */ 2246int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2247{ 2248 unsigned int val; 2249 int ret; 2250 2251 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2252 if (ret != 0) 2253 return ret; 2254 2255 val &= rdev->desc->vsel_mask; 2256 val >>= ffs(rdev->desc->vsel_mask) - 1; 2257 2258 return val; 2259} 2260EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2261 2262/** 2263 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2264 * 2265 * @rdev: regulator to operate on 2266 * @sel: Selector to set 2267 * 2268 * Regulators that use regmap for their register I/O can set the 2269 * vsel_reg and vsel_mask fields in their descriptor and then use this 2270 * as their set_voltage_vsel operation, saving some code. 2271 */ 2272int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2273{ 2274 int ret; 2275 2276 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2277 2278 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2279 rdev->desc->vsel_mask, sel); 2280 if (ret) 2281 return ret; 2282 2283 if (rdev->desc->apply_bit) 2284 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, 2285 rdev->desc->apply_bit, 2286 rdev->desc->apply_bit); 2287 return ret; 2288} 2289EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2290 2291/** 2292 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2293 * 2294 * @rdev: Regulator to operate on 2295 * @min_uV: Lower bound for voltage 2296 * @max_uV: Upper bound for voltage 2297 * 2298 * Drivers implementing set_voltage_sel() and list_voltage() can use 2299 * this as their map_voltage() operation. It will find a suitable 2300 * voltage by calling list_voltage() until it gets something in bounds 2301 * for the requested voltages. 2302 */ 2303int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2304 int min_uV, int max_uV) 2305{ 2306 int best_val = INT_MAX; 2307 int selector = 0; 2308 int i, ret; 2309 2310 /* Find the smallest voltage that falls within the specified 2311 * range. 2312 */ 2313 for (i = 0; i < rdev->desc->n_voltages; i++) { 2314 ret = rdev->desc->ops->list_voltage(rdev, i); 2315 if (ret < 0) 2316 continue; 2317 2318 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2319 best_val = ret; 2320 selector = i; 2321 } 2322 } 2323 2324 if (best_val != INT_MAX) 2325 return selector; 2326 else 2327 return -EINVAL; 2328} 2329EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2330 2331/** 2332 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list 2333 * 2334 * @rdev: Regulator to operate on 2335 * @min_uV: Lower bound for voltage 2336 * @max_uV: Upper bound for voltage 2337 * 2338 * Drivers that have ascendant voltage list can use this as their 2339 * map_voltage() operation. 2340 */ 2341int regulator_map_voltage_ascend(struct regulator_dev *rdev, 2342 int min_uV, int max_uV) 2343{ 2344 int i, ret; 2345 2346 for (i = 0; i < rdev->desc->n_voltages; i++) { 2347 ret = rdev->desc->ops->list_voltage(rdev, i); 2348 if (ret < 0) 2349 continue; 2350 2351 if (ret > max_uV) 2352 break; 2353 2354 if (ret >= min_uV && ret <= max_uV) 2355 return i; 2356 } 2357 2358 return -EINVAL; 2359} 2360EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend); 2361 2362/** 2363 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2364 * 2365 * @rdev: Regulator to operate on 2366 * @min_uV: Lower bound for voltage 2367 * @max_uV: Upper bound for voltage 2368 * 2369 * Drivers providing min_uV and uV_step in their regulator_desc can 2370 * use this as their map_voltage() operation. 2371 */ 2372int regulator_map_voltage_linear(struct regulator_dev *rdev, 2373 int min_uV, int max_uV) 2374{ 2375 int ret, voltage; 2376 2377 /* Allow uV_step to be 0 for fixed voltage */ 2378 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2379 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2380 return 0; 2381 else 2382 return -EINVAL; 2383 } 2384 2385 if (!rdev->desc->uV_step) { 2386 BUG_ON(!rdev->desc->uV_step); 2387 return -EINVAL; 2388 } 2389 2390 if (min_uV < rdev->desc->min_uV) 2391 min_uV = rdev->desc->min_uV; 2392 2393 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2394 if (ret < 0) 2395 return ret; 2396 2397 ret += rdev->desc->linear_min_sel; 2398 2399 /* Map back into a voltage to verify we're still in bounds */ 2400 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2401 if (voltage < min_uV || voltage > max_uV) 2402 return -EINVAL; 2403 2404 return ret; 2405} 2406EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2407 2408/** 2409 * regulator_map_voltage_linear - map_voltage() for multiple linear ranges 2410 * 2411 * @rdev: Regulator to operate on 2412 * @min_uV: Lower bound for voltage 2413 * @max_uV: Upper bound for voltage 2414 * 2415 * Drivers providing linear_ranges in their descriptor can use this as 2416 * their map_voltage() callback. 2417 */ 2418int regulator_map_voltage_linear_range(struct regulator_dev *rdev, 2419 int min_uV, int max_uV) 2420{ 2421 const struct regulator_linear_range *range; 2422 int ret = -EINVAL; 2423 int voltage, i; 2424 2425 if (!rdev->desc->n_linear_ranges) { 2426 BUG_ON(!rdev->desc->n_linear_ranges); 2427 return -EINVAL; 2428 } 2429 2430 for (i = 0; i < rdev->desc->n_linear_ranges; i++) { 2431 range = &rdev->desc->linear_ranges[i]; 2432 2433 if (!(min_uV <= range->max_uV && max_uV >= range->min_uV)) 2434 continue; 2435 2436 if (min_uV <= range->min_uV) 2437 min_uV = range->min_uV; 2438 2439 /* range->uV_step == 0 means fixed voltage range */ 2440 if (range->uV_step == 0) { 2441 ret = 0; 2442 } else { 2443 ret = DIV_ROUND_UP(min_uV - range->min_uV, 2444 range->uV_step); 2445 if (ret < 0) 2446 return ret; 2447 } 2448 2449 break; 2450 } 2451 2452 if (i == rdev->desc->n_linear_ranges) 2453 return -EINVAL; 2454 2455 /* Map back into a voltage to verify we're still in bounds */ 2456 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2457 if (voltage < min_uV || voltage > max_uV) 2458 return -EINVAL; 2459 2460 return ret; 2461} 2462EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range); 2463 2464static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2465 int min_uV, int max_uV) 2466{ 2467 int ret; 2468 int delay = 0; 2469 int best_val = 0; 2470 unsigned int selector; 2471 int old_selector = -1; 2472 2473 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2474 2475 min_uV += rdev->constraints->uV_offset; 2476 max_uV += rdev->constraints->uV_offset; 2477 2478 /* 2479 * If we can't obtain the old selector there is not enough 2480 * info to call set_voltage_time_sel(). 2481 */ 2482 if (_regulator_is_enabled(rdev) && 2483 rdev->desc->ops->set_voltage_time_sel && 2484 rdev->desc->ops->get_voltage_sel) { 2485 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2486 if (old_selector < 0) 2487 return old_selector; 2488 } 2489 2490 if (rdev->desc->ops->set_voltage) { 2491 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2492 &selector); 2493 2494 if (ret >= 0) { 2495 if (rdev->desc->ops->list_voltage) 2496 best_val = rdev->desc->ops->list_voltage(rdev, 2497 selector); 2498 else 2499 best_val = _regulator_get_voltage(rdev); 2500 } 2501 2502 } else if (rdev->desc->ops->set_voltage_sel) { 2503 if (rdev->desc->ops->map_voltage) { 2504 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2505 max_uV); 2506 } else { 2507 if (rdev->desc->ops->list_voltage == 2508 regulator_list_voltage_linear) 2509 ret = regulator_map_voltage_linear(rdev, 2510 min_uV, max_uV); 2511 else 2512 ret = regulator_map_voltage_iterate(rdev, 2513 min_uV, max_uV); 2514 } 2515 2516 if (ret >= 0) { 2517 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2518 if (min_uV <= best_val && max_uV >= best_val) { 2519 selector = ret; 2520 if (old_selector == selector) 2521 ret = 0; 2522 else 2523 ret = rdev->desc->ops->set_voltage_sel( 2524 rdev, ret); 2525 } else { 2526 ret = -EINVAL; 2527 } 2528 } 2529 } else { 2530 ret = -EINVAL; 2531 } 2532 2533 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2534 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2535 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { 2536 2537 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2538 old_selector, selector); 2539 if (delay < 0) { 2540 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2541 delay); 2542 delay = 0; 2543 } 2544 2545 /* Insert any necessary delays */ 2546 if (delay >= 1000) { 2547 mdelay(delay / 1000); 2548 udelay(delay % 1000); 2549 } else if (delay) { 2550 udelay(delay); 2551 } 2552 } 2553 2554 if (ret == 0 && best_val >= 0) { 2555 unsigned long data = best_val; 2556 2557 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2558 (void *)data); 2559 } 2560 2561 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2562 2563 return ret; 2564} 2565 2566/** 2567 * regulator_set_voltage - set regulator output voltage 2568 * @regulator: regulator source 2569 * @min_uV: Minimum required voltage in uV 2570 * @max_uV: Maximum acceptable voltage in uV 2571 * 2572 * Sets a voltage regulator to the desired output voltage. This can be set 2573 * during any regulator state. IOW, regulator can be disabled or enabled. 2574 * 2575 * If the regulator is enabled then the voltage will change to the new value 2576 * immediately otherwise if the regulator is disabled the regulator will 2577 * output at the new voltage when enabled. 2578 * 2579 * NOTE: If the regulator is shared between several devices then the lowest 2580 * request voltage that meets the system constraints will be used. 2581 * Regulator system constraints must be set for this regulator before 2582 * calling this function otherwise this call will fail. 2583 */ 2584int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2585{ 2586 struct regulator_dev *rdev = regulator->rdev; 2587 int ret = 0; 2588 int old_min_uV, old_max_uV; 2589 2590 mutex_lock(&rdev->mutex); 2591 2592 /* If we're setting the same range as last time the change 2593 * should be a noop (some cpufreq implementations use the same 2594 * voltage for multiple frequencies, for example). 2595 */ 2596 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2597 goto out; 2598 2599 /* sanity check */ 2600 if (!rdev->desc->ops->set_voltage && 2601 !rdev->desc->ops->set_voltage_sel) { 2602 ret = -EINVAL; 2603 goto out; 2604 } 2605 2606 /* constraints check */ 2607 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2608 if (ret < 0) 2609 goto out; 2610 2611 /* restore original values in case of error */ 2612 old_min_uV = regulator->min_uV; 2613 old_max_uV = regulator->max_uV; 2614 regulator->min_uV = min_uV; 2615 regulator->max_uV = max_uV; 2616 2617 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2618 if (ret < 0) 2619 goto out2; 2620 2621 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2622 if (ret < 0) 2623 goto out2; 2624 2625out: 2626 mutex_unlock(&rdev->mutex); 2627 return ret; 2628out2: 2629 regulator->min_uV = old_min_uV; 2630 regulator->max_uV = old_max_uV; 2631 mutex_unlock(&rdev->mutex); 2632 return ret; 2633} 2634EXPORT_SYMBOL_GPL(regulator_set_voltage); 2635 2636/** 2637 * regulator_set_voltage_time - get raise/fall time 2638 * @regulator: regulator source 2639 * @old_uV: starting voltage in microvolts 2640 * @new_uV: target voltage in microvolts 2641 * 2642 * Provided with the starting and ending voltage, this function attempts to 2643 * calculate the time in microseconds required to rise or fall to this new 2644 * voltage. 2645 */ 2646int regulator_set_voltage_time(struct regulator *regulator, 2647 int old_uV, int new_uV) 2648{ 2649 struct regulator_dev *rdev = regulator->rdev; 2650 struct regulator_ops *ops = rdev->desc->ops; 2651 int old_sel = -1; 2652 int new_sel = -1; 2653 int voltage; 2654 int i; 2655 2656 /* Currently requires operations to do this */ 2657 if (!ops->list_voltage || !ops->set_voltage_time_sel 2658 || !rdev->desc->n_voltages) 2659 return -EINVAL; 2660 2661 for (i = 0; i < rdev->desc->n_voltages; i++) { 2662 /* We only look for exact voltage matches here */ 2663 voltage = regulator_list_voltage(regulator, i); 2664 if (voltage < 0) 2665 return -EINVAL; 2666 if (voltage == 0) 2667 continue; 2668 if (voltage == old_uV) 2669 old_sel = i; 2670 if (voltage == new_uV) 2671 new_sel = i; 2672 } 2673 2674 if (old_sel < 0 || new_sel < 0) 2675 return -EINVAL; 2676 2677 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2678} 2679EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2680 2681/** 2682 * regulator_set_voltage_time_sel - get raise/fall time 2683 * @rdev: regulator source device 2684 * @old_selector: selector for starting voltage 2685 * @new_selector: selector for target voltage 2686 * 2687 * Provided with the starting and target voltage selectors, this function 2688 * returns time in microseconds required to rise or fall to this new voltage 2689 * 2690 * Drivers providing ramp_delay in regulation_constraints can use this as their 2691 * set_voltage_time_sel() operation. 2692 */ 2693int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2694 unsigned int old_selector, 2695 unsigned int new_selector) 2696{ 2697 unsigned int ramp_delay = 0; 2698 int old_volt, new_volt; 2699 2700 if (rdev->constraints->ramp_delay) 2701 ramp_delay = rdev->constraints->ramp_delay; 2702 else if (rdev->desc->ramp_delay) 2703 ramp_delay = rdev->desc->ramp_delay; 2704 2705 if (ramp_delay == 0) { 2706 rdev_warn(rdev, "ramp_delay not set\n"); 2707 return 0; 2708 } 2709 2710 /* sanity check */ 2711 if (!rdev->desc->ops->list_voltage) 2712 return -EINVAL; 2713 2714 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2715 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2716 2717 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2718} 2719EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2720 2721/** 2722 * regulator_sync_voltage - re-apply last regulator output voltage 2723 * @regulator: regulator source 2724 * 2725 * Re-apply the last configured voltage. This is intended to be used 2726 * where some external control source the consumer is cooperating with 2727 * has caused the configured voltage to change. 2728 */ 2729int regulator_sync_voltage(struct regulator *regulator) 2730{ 2731 struct regulator_dev *rdev = regulator->rdev; 2732 int ret, min_uV, max_uV; 2733 2734 mutex_lock(&rdev->mutex); 2735 2736 if (!rdev->desc->ops->set_voltage && 2737 !rdev->desc->ops->set_voltage_sel) { 2738 ret = -EINVAL; 2739 goto out; 2740 } 2741 2742 /* This is only going to work if we've had a voltage configured. */ 2743 if (!regulator->min_uV && !regulator->max_uV) { 2744 ret = -EINVAL; 2745 goto out; 2746 } 2747 2748 min_uV = regulator->min_uV; 2749 max_uV = regulator->max_uV; 2750 2751 /* This should be a paranoia check... */ 2752 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2753 if (ret < 0) 2754 goto out; 2755 2756 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2757 if (ret < 0) 2758 goto out; 2759 2760 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2761 2762out: 2763 mutex_unlock(&rdev->mutex); 2764 return ret; 2765} 2766EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2767 2768static int _regulator_get_voltage(struct regulator_dev *rdev) 2769{ 2770 int sel, ret; 2771 2772 if (rdev->desc->ops->get_voltage_sel) { 2773 sel = rdev->desc->ops->get_voltage_sel(rdev); 2774 if (sel < 0) 2775 return sel; 2776 ret = rdev->desc->ops->list_voltage(rdev, sel); 2777 } else if (rdev->desc->ops->get_voltage) { 2778 ret = rdev->desc->ops->get_voltage(rdev); 2779 } else if (rdev->desc->ops->list_voltage) { 2780 ret = rdev->desc->ops->list_voltage(rdev, 0); 2781 } else { 2782 return -EINVAL; 2783 } 2784 2785 if (ret < 0) 2786 return ret; 2787 return ret - rdev->constraints->uV_offset; 2788} 2789 2790/** 2791 * regulator_get_voltage - get regulator output voltage 2792 * @regulator: regulator source 2793 * 2794 * This returns the current regulator voltage in uV. 2795 * 2796 * NOTE: If the regulator is disabled it will return the voltage value. This 2797 * function should not be used to determine regulator state. 2798 */ 2799int regulator_get_voltage(struct regulator *regulator) 2800{ 2801 int ret; 2802 2803 mutex_lock(®ulator->rdev->mutex); 2804 2805 ret = _regulator_get_voltage(regulator->rdev); 2806 2807 mutex_unlock(®ulator->rdev->mutex); 2808 2809 return ret; 2810} 2811EXPORT_SYMBOL_GPL(regulator_get_voltage); 2812 2813/** 2814 * regulator_set_current_limit - set regulator output current limit 2815 * @regulator: regulator source 2816 * @min_uA: Minimum supported current in uA 2817 * @max_uA: Maximum supported current in uA 2818 * 2819 * Sets current sink to the desired output current. This can be set during 2820 * any regulator state. IOW, regulator can be disabled or enabled. 2821 * 2822 * If the regulator is enabled then the current will change to the new value 2823 * immediately otherwise if the regulator is disabled the regulator will 2824 * output at the new current when enabled. 2825 * 2826 * NOTE: Regulator system constraints must be set for this regulator before 2827 * calling this function otherwise this call will fail. 2828 */ 2829int regulator_set_current_limit(struct regulator *regulator, 2830 int min_uA, int max_uA) 2831{ 2832 struct regulator_dev *rdev = regulator->rdev; 2833 int ret; 2834 2835 mutex_lock(&rdev->mutex); 2836 2837 /* sanity check */ 2838 if (!rdev->desc->ops->set_current_limit) { 2839 ret = -EINVAL; 2840 goto out; 2841 } 2842 2843 /* constraints check */ 2844 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2845 if (ret < 0) 2846 goto out; 2847 2848 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2849out: 2850 mutex_unlock(&rdev->mutex); 2851 return ret; 2852} 2853EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2854 2855static int _regulator_get_current_limit(struct regulator_dev *rdev) 2856{ 2857 int ret; 2858 2859 mutex_lock(&rdev->mutex); 2860 2861 /* sanity check */ 2862 if (!rdev->desc->ops->get_current_limit) { 2863 ret = -EINVAL; 2864 goto out; 2865 } 2866 2867 ret = rdev->desc->ops->get_current_limit(rdev); 2868out: 2869 mutex_unlock(&rdev->mutex); 2870 return ret; 2871} 2872 2873/** 2874 * regulator_get_current_limit - get regulator output current 2875 * @regulator: regulator source 2876 * 2877 * This returns the current supplied by the specified current sink in uA. 2878 * 2879 * NOTE: If the regulator is disabled it will return the current value. This 2880 * function should not be used to determine regulator state. 2881 */ 2882int regulator_get_current_limit(struct regulator *regulator) 2883{ 2884 return _regulator_get_current_limit(regulator->rdev); 2885} 2886EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2887 2888/** 2889 * regulator_set_mode - set regulator operating mode 2890 * @regulator: regulator source 2891 * @mode: operating mode - one of the REGULATOR_MODE constants 2892 * 2893 * Set regulator operating mode to increase regulator efficiency or improve 2894 * regulation performance. 2895 * 2896 * NOTE: Regulator system constraints must be set for this regulator before 2897 * calling this function otherwise this call will fail. 2898 */ 2899int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2900{ 2901 struct regulator_dev *rdev = regulator->rdev; 2902 int ret; 2903 int regulator_curr_mode; 2904 2905 mutex_lock(&rdev->mutex); 2906 2907 /* sanity check */ 2908 if (!rdev->desc->ops->set_mode) { 2909 ret = -EINVAL; 2910 goto out; 2911 } 2912 2913 /* return if the same mode is requested */ 2914 if (rdev->desc->ops->get_mode) { 2915 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2916 if (regulator_curr_mode == mode) { 2917 ret = 0; 2918 goto out; 2919 } 2920 } 2921 2922 /* constraints check */ 2923 ret = regulator_mode_constrain(rdev, &mode); 2924 if (ret < 0) 2925 goto out; 2926 2927 ret = rdev->desc->ops->set_mode(rdev, mode); 2928out: 2929 mutex_unlock(&rdev->mutex); 2930 return ret; 2931} 2932EXPORT_SYMBOL_GPL(regulator_set_mode); 2933 2934static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2935{ 2936 int ret; 2937 2938 mutex_lock(&rdev->mutex); 2939 2940 /* sanity check */ 2941 if (!rdev->desc->ops->get_mode) { 2942 ret = -EINVAL; 2943 goto out; 2944 } 2945 2946 ret = rdev->desc->ops->get_mode(rdev); 2947out: 2948 mutex_unlock(&rdev->mutex); 2949 return ret; 2950} 2951 2952/** 2953 * regulator_get_mode - get regulator operating mode 2954 * @regulator: regulator source 2955 * 2956 * Get the current regulator operating mode. 2957 */ 2958unsigned int regulator_get_mode(struct regulator *regulator) 2959{ 2960 return _regulator_get_mode(regulator->rdev); 2961} 2962EXPORT_SYMBOL_GPL(regulator_get_mode); 2963 2964/** 2965 * regulator_set_optimum_mode - set regulator optimum operating mode 2966 * @regulator: regulator source 2967 * @uA_load: load current 2968 * 2969 * Notifies the regulator core of a new device load. This is then used by 2970 * DRMS (if enabled by constraints) to set the most efficient regulator 2971 * operating mode for the new regulator loading. 2972 * 2973 * Consumer devices notify their supply regulator of the maximum power 2974 * they will require (can be taken from device datasheet in the power 2975 * consumption tables) when they change operational status and hence power 2976 * state. Examples of operational state changes that can affect power 2977 * consumption are :- 2978 * 2979 * o Device is opened / closed. 2980 * o Device I/O is about to begin or has just finished. 2981 * o Device is idling in between work. 2982 * 2983 * This information is also exported via sysfs to userspace. 2984 * 2985 * DRMS will sum the total requested load on the regulator and change 2986 * to the most efficient operating mode if platform constraints allow. 2987 * 2988 * Returns the new regulator mode or error. 2989 */ 2990int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2991{ 2992 struct regulator_dev *rdev = regulator->rdev; 2993 struct regulator *consumer; 2994 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2995 unsigned int mode; 2996 2997 if (rdev->supply) 2998 input_uV = regulator_get_voltage(rdev->supply); 2999 3000 mutex_lock(&rdev->mutex); 3001 3002 /* 3003 * first check to see if we can set modes at all, otherwise just 3004 * tell the consumer everything is OK. 3005 */ 3006 regulator->uA_load = uA_load; 3007 ret = regulator_check_drms(rdev); 3008 if (ret < 0) { 3009 ret = 0; 3010 goto out; 3011 } 3012 3013 if (!rdev->desc->ops->get_optimum_mode) 3014 goto out; 3015 3016 /* 3017 * we can actually do this so any errors are indicators of 3018 * potential real failure. 3019 */ 3020 ret = -EINVAL; 3021 3022 if (!rdev->desc->ops->set_mode) 3023 goto out; 3024 3025 /* get output voltage */ 3026 output_uV = _regulator_get_voltage(rdev); 3027 if (output_uV <= 0) { 3028 rdev_err(rdev, "invalid output voltage found\n"); 3029 goto out; 3030 } 3031 3032 /* No supply? Use constraint voltage */ 3033 if (input_uV <= 0) 3034 input_uV = rdev->constraints->input_uV; 3035 if (input_uV <= 0) { 3036 rdev_err(rdev, "invalid input voltage found\n"); 3037 goto out; 3038 } 3039 3040 /* calc total requested load for this regulator */ 3041 list_for_each_entry(consumer, &rdev->consumer_list, list) 3042 total_uA_load += consumer->uA_load; 3043 3044 mode = rdev->desc->ops->get_optimum_mode(rdev, 3045 input_uV, output_uV, 3046 total_uA_load); 3047 ret = regulator_mode_constrain(rdev, &mode); 3048 if (ret < 0) { 3049 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 3050 total_uA_load, input_uV, output_uV); 3051 goto out; 3052 } 3053 3054 ret = rdev->desc->ops->set_mode(rdev, mode); 3055 if (ret < 0) { 3056 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 3057 goto out; 3058 } 3059 ret = mode; 3060out: 3061 mutex_unlock(&rdev->mutex); 3062 return ret; 3063} 3064EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 3065 3066/** 3067 * regulator_set_bypass_regmap - Default set_bypass() using regmap 3068 * 3069 * @rdev: device to operate on. 3070 * @enable: state to set. 3071 */ 3072int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 3073{ 3074 unsigned int val; 3075 3076 if (enable) 3077 val = rdev->desc->bypass_mask; 3078 else 3079 val = 0; 3080 3081 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 3082 rdev->desc->bypass_mask, val); 3083} 3084EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 3085 3086/** 3087 * regulator_get_bypass_regmap - Default get_bypass() using regmap 3088 * 3089 * @rdev: device to operate on. 3090 * @enable: current state. 3091 */ 3092int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 3093{ 3094 unsigned int val; 3095 int ret; 3096 3097 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 3098 if (ret != 0) 3099 return ret; 3100 3101 *enable = val & rdev->desc->bypass_mask; 3102 3103 return 0; 3104} 3105EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 3106 3107/** 3108 * regulator_allow_bypass - allow the regulator to go into bypass mode 3109 * 3110 * @regulator: Regulator to configure 3111 * @enable: enable or disable bypass mode 3112 * 3113 * Allow the regulator to go into bypass mode if all other consumers 3114 * for the regulator also enable bypass mode and the machine 3115 * constraints allow this. Bypass mode means that the regulator is 3116 * simply passing the input directly to the output with no regulation. 3117 */ 3118int regulator_allow_bypass(struct regulator *regulator, bool enable) 3119{ 3120 struct regulator_dev *rdev = regulator->rdev; 3121 int ret = 0; 3122 3123 if (!rdev->desc->ops->set_bypass) 3124 return 0; 3125 3126 if (rdev->constraints && 3127 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 3128 return 0; 3129 3130 mutex_lock(&rdev->mutex); 3131 3132 if (enable && !regulator->bypass) { 3133 rdev->bypass_count++; 3134 3135 if (rdev->bypass_count == rdev->open_count) { 3136 ret = rdev->desc->ops->set_bypass(rdev, enable); 3137 if (ret != 0) 3138 rdev->bypass_count--; 3139 } 3140 3141 } else if (!enable && regulator->bypass) { 3142 rdev->bypass_count--; 3143 3144 if (rdev->bypass_count != rdev->open_count) { 3145 ret = rdev->desc->ops->set_bypass(rdev, enable); 3146 if (ret != 0) 3147 rdev->bypass_count++; 3148 } 3149 } 3150 3151 if (ret == 0) 3152 regulator->bypass = enable; 3153 3154 mutex_unlock(&rdev->mutex); 3155 3156 return ret; 3157} 3158EXPORT_SYMBOL_GPL(regulator_allow_bypass); 3159 3160/** 3161 * regulator_register_notifier - register regulator event notifier 3162 * @regulator: regulator source 3163 * @nb: notifier block 3164 * 3165 * Register notifier block to receive regulator events. 3166 */ 3167int regulator_register_notifier(struct regulator *regulator, 3168 struct notifier_block *nb) 3169{ 3170 return blocking_notifier_chain_register(®ulator->rdev->notifier, 3171 nb); 3172} 3173EXPORT_SYMBOL_GPL(regulator_register_notifier); 3174 3175/** 3176 * regulator_unregister_notifier - unregister regulator event notifier 3177 * @regulator: regulator source 3178 * @nb: notifier block 3179 * 3180 * Unregister regulator event notifier block. 3181 */ 3182int regulator_unregister_notifier(struct regulator *regulator, 3183 struct notifier_block *nb) 3184{ 3185 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 3186 nb); 3187} 3188EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 3189 3190/* notify regulator consumers and downstream regulator consumers. 3191 * Note mutex must be held by caller. 3192 */ 3193static void _notifier_call_chain(struct regulator_dev *rdev, 3194 unsigned long event, void *data) 3195{ 3196 /* call rdev chain first */ 3197 blocking_notifier_call_chain(&rdev->notifier, event, data); 3198} 3199 3200/** 3201 * regulator_bulk_get - get multiple regulator consumers 3202 * 3203 * @dev: Device to supply 3204 * @num_consumers: Number of consumers to register 3205 * @consumers: Configuration of consumers; clients are stored here. 3206 * 3207 * @return 0 on success, an errno on failure. 3208 * 3209 * This helper function allows drivers to get several regulator 3210 * consumers in one operation. If any of the regulators cannot be 3211 * acquired then any regulators that were allocated will be freed 3212 * before returning to the caller. 3213 */ 3214int regulator_bulk_get(struct device *dev, int num_consumers, 3215 struct regulator_bulk_data *consumers) 3216{ 3217 int i; 3218 int ret; 3219 3220 for (i = 0; i < num_consumers; i++) 3221 consumers[i].consumer = NULL; 3222 3223 for (i = 0; i < num_consumers; i++) { 3224 consumers[i].consumer = regulator_get(dev, 3225 consumers[i].supply); 3226 if (IS_ERR(consumers[i].consumer)) { 3227 ret = PTR_ERR(consumers[i].consumer); 3228 dev_err(dev, "Failed to get supply '%s': %d\n", 3229 consumers[i].supply, ret); 3230 consumers[i].consumer = NULL; 3231 goto err; 3232 } 3233 } 3234 3235 return 0; 3236 3237err: 3238 while (--i >= 0) 3239 regulator_put(consumers[i].consumer); 3240 3241 return ret; 3242} 3243EXPORT_SYMBOL_GPL(regulator_bulk_get); 3244 3245/** 3246 * devm_regulator_bulk_get - managed get multiple regulator consumers 3247 * 3248 * @dev: Device to supply 3249 * @num_consumers: Number of consumers to register 3250 * @consumers: Configuration of consumers; clients are stored here. 3251 * 3252 * @return 0 on success, an errno on failure. 3253 * 3254 * This helper function allows drivers to get several regulator 3255 * consumers in one operation with management, the regulators will 3256 * automatically be freed when the device is unbound. If any of the 3257 * regulators cannot be acquired then any regulators that were 3258 * allocated will be freed before returning to the caller. 3259 */ 3260int devm_regulator_bulk_get(struct device *dev, int num_consumers, 3261 struct regulator_bulk_data *consumers) 3262{ 3263 int i; 3264 int ret; 3265 3266 for (i = 0; i < num_consumers; i++) 3267 consumers[i].consumer = NULL; 3268 3269 for (i = 0; i < num_consumers; i++) { 3270 consumers[i].consumer = devm_regulator_get(dev, 3271 consumers[i].supply); 3272 if (IS_ERR(consumers[i].consumer)) { 3273 ret = PTR_ERR(consumers[i].consumer); 3274 dev_err(dev, "Failed to get supply '%s': %d\n", 3275 consumers[i].supply, ret); 3276 consumers[i].consumer = NULL; 3277 goto err; 3278 } 3279 } 3280 3281 return 0; 3282 3283err: 3284 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 3285 devm_regulator_put(consumers[i].consumer); 3286 3287 return ret; 3288} 3289EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 3290 3291static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3292{ 3293 struct regulator_bulk_data *bulk = data; 3294 3295 bulk->ret = regulator_enable(bulk->consumer); 3296} 3297 3298/** 3299 * regulator_bulk_enable - enable multiple regulator consumers 3300 * 3301 * @num_consumers: Number of consumers 3302 * @consumers: Consumer data; clients are stored here. 3303 * @return 0 on success, an errno on failure 3304 * 3305 * This convenience API allows consumers to enable multiple regulator 3306 * clients in a single API call. If any consumers cannot be enabled 3307 * then any others that were enabled will be disabled again prior to 3308 * return. 3309 */ 3310int regulator_bulk_enable(int num_consumers, 3311 struct regulator_bulk_data *consumers) 3312{ 3313 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3314 int i; 3315 int ret = 0; 3316 3317 for (i = 0; i < num_consumers; i++) { 3318 if (consumers[i].consumer->always_on) 3319 consumers[i].ret = 0; 3320 else 3321 async_schedule_domain(regulator_bulk_enable_async, 3322 &consumers[i], &async_domain); 3323 } 3324 3325 async_synchronize_full_domain(&async_domain); 3326 3327 /* If any consumer failed we need to unwind any that succeeded */ 3328 for (i = 0; i < num_consumers; i++) { 3329 if (consumers[i].ret != 0) { 3330 ret = consumers[i].ret; 3331 goto err; 3332 } 3333 } 3334 3335 return 0; 3336 3337err: 3338 for (i = 0; i < num_consumers; i++) { 3339 if (consumers[i].ret < 0) 3340 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3341 consumers[i].ret); 3342 else 3343 regulator_disable(consumers[i].consumer); 3344 } 3345 3346 return ret; 3347} 3348EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3349 3350/** 3351 * regulator_bulk_disable - disable multiple regulator consumers 3352 * 3353 * @num_consumers: Number of consumers 3354 * @consumers: Consumer data; clients are stored here. 3355 * @return 0 on success, an errno on failure 3356 * 3357 * This convenience API allows consumers to disable multiple regulator 3358 * clients in a single API call. If any consumers cannot be disabled 3359 * then any others that were disabled will be enabled again prior to 3360 * return. 3361 */ 3362int regulator_bulk_disable(int num_consumers, 3363 struct regulator_bulk_data *consumers) 3364{ 3365 int i; 3366 int ret, r; 3367 3368 for (i = num_consumers - 1; i >= 0; --i) { 3369 ret = regulator_disable(consumers[i].consumer); 3370 if (ret != 0) 3371 goto err; 3372 } 3373 3374 return 0; 3375 3376err: 3377 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3378 for (++i; i < num_consumers; ++i) { 3379 r = regulator_enable(consumers[i].consumer); 3380 if (r != 0) 3381 pr_err("Failed to reename %s: %d\n", 3382 consumers[i].supply, r); 3383 } 3384 3385 return ret; 3386} 3387EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3388 3389/** 3390 * regulator_bulk_force_disable - force disable multiple regulator consumers 3391 * 3392 * @num_consumers: Number of consumers 3393 * @consumers: Consumer data; clients are stored here. 3394 * @return 0 on success, an errno on failure 3395 * 3396 * This convenience API allows consumers to forcibly disable multiple regulator 3397 * clients in a single API call. 3398 * NOTE: This should be used for situations when device damage will 3399 * likely occur if the regulators are not disabled (e.g. over temp). 3400 * Although regulator_force_disable function call for some consumers can 3401 * return error numbers, the function is called for all consumers. 3402 */ 3403int regulator_bulk_force_disable(int num_consumers, 3404 struct regulator_bulk_data *consumers) 3405{ 3406 int i; 3407 int ret; 3408 3409 for (i = 0; i < num_consumers; i++) 3410 consumers[i].ret = 3411 regulator_force_disable(consumers[i].consumer); 3412 3413 for (i = 0; i < num_consumers; i++) { 3414 if (consumers[i].ret != 0) { 3415 ret = consumers[i].ret; 3416 goto out; 3417 } 3418 } 3419 3420 return 0; 3421out: 3422 return ret; 3423} 3424EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3425 3426/** 3427 * regulator_bulk_free - free multiple regulator consumers 3428 * 3429 * @num_consumers: Number of consumers 3430 * @consumers: Consumer data; clients are stored here. 3431 * 3432 * This convenience API allows consumers to free multiple regulator 3433 * clients in a single API call. 3434 */ 3435void regulator_bulk_free(int num_consumers, 3436 struct regulator_bulk_data *consumers) 3437{ 3438 int i; 3439 3440 for (i = 0; i < num_consumers; i++) { 3441 regulator_put(consumers[i].consumer); 3442 consumers[i].consumer = NULL; 3443 } 3444} 3445EXPORT_SYMBOL_GPL(regulator_bulk_free); 3446 3447/** 3448 * regulator_notifier_call_chain - call regulator event notifier 3449 * @rdev: regulator source 3450 * @event: notifier block 3451 * @data: callback-specific data. 3452 * 3453 * Called by regulator drivers to notify clients a regulator event has 3454 * occurred. We also notify regulator clients downstream. 3455 * Note lock must be held by caller. 3456 */ 3457int regulator_notifier_call_chain(struct regulator_dev *rdev, 3458 unsigned long event, void *data) 3459{ 3460 _notifier_call_chain(rdev, event, data); 3461 return NOTIFY_DONE; 3462 3463} 3464EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3465 3466/** 3467 * regulator_mode_to_status - convert a regulator mode into a status 3468 * 3469 * @mode: Mode to convert 3470 * 3471 * Convert a regulator mode into a status. 3472 */ 3473int regulator_mode_to_status(unsigned int mode) 3474{ 3475 switch (mode) { 3476 case REGULATOR_MODE_FAST: 3477 return REGULATOR_STATUS_FAST; 3478 case REGULATOR_MODE_NORMAL: 3479 return REGULATOR_STATUS_NORMAL; 3480 case REGULATOR_MODE_IDLE: 3481 return REGULATOR_STATUS_IDLE; 3482 case REGULATOR_MODE_STANDBY: 3483 return REGULATOR_STATUS_STANDBY; 3484 default: 3485 return REGULATOR_STATUS_UNDEFINED; 3486 } 3487} 3488EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3489 3490/* 3491 * To avoid cluttering sysfs (and memory) with useless state, only 3492 * create attributes that can be meaningfully displayed. 3493 */ 3494static int add_regulator_attributes(struct regulator_dev *rdev) 3495{ 3496 struct device *dev = &rdev->dev; 3497 struct regulator_ops *ops = rdev->desc->ops; 3498 int status = 0; 3499 3500 /* some attributes need specific methods to be displayed */ 3501 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3502 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3503 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3504 status = device_create_file(dev, &dev_attr_microvolts); 3505 if (status < 0) 3506 return status; 3507 } 3508 if (ops->get_current_limit) { 3509 status = device_create_file(dev, &dev_attr_microamps); 3510 if (status < 0) 3511 return status; 3512 } 3513 if (ops->get_mode) { 3514 status = device_create_file(dev, &dev_attr_opmode); 3515 if (status < 0) 3516 return status; 3517 } 3518 if (rdev->ena_pin || ops->is_enabled) { 3519 status = device_create_file(dev, &dev_attr_state); 3520 if (status < 0) 3521 return status; 3522 } 3523 if (ops->get_status) { 3524 status = device_create_file(dev, &dev_attr_status); 3525 if (status < 0) 3526 return status; 3527 } 3528 if (ops->get_bypass) { 3529 status = device_create_file(dev, &dev_attr_bypass); 3530 if (status < 0) 3531 return status; 3532 } 3533 3534 /* some attributes are type-specific */ 3535 if (rdev->desc->type == REGULATOR_CURRENT) { 3536 status = device_create_file(dev, &dev_attr_requested_microamps); 3537 if (status < 0) 3538 return status; 3539 } 3540 3541 /* all the other attributes exist to support constraints; 3542 * don't show them if there are no constraints, or if the 3543 * relevant supporting methods are missing. 3544 */ 3545 if (!rdev->constraints) 3546 return status; 3547 3548 /* constraints need specific supporting methods */ 3549 if (ops->set_voltage || ops->set_voltage_sel) { 3550 status = device_create_file(dev, &dev_attr_min_microvolts); 3551 if (status < 0) 3552 return status; 3553 status = device_create_file(dev, &dev_attr_max_microvolts); 3554 if (status < 0) 3555 return status; 3556 } 3557 if (ops->set_current_limit) { 3558 status = device_create_file(dev, &dev_attr_min_microamps); 3559 if (status < 0) 3560 return status; 3561 status = device_create_file(dev, &dev_attr_max_microamps); 3562 if (status < 0) 3563 return status; 3564 } 3565 3566 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3567 if (status < 0) 3568 return status; 3569 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3570 if (status < 0) 3571 return status; 3572 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3573 if (status < 0) 3574 return status; 3575 3576 if (ops->set_suspend_voltage) { 3577 status = device_create_file(dev, 3578 &dev_attr_suspend_standby_microvolts); 3579 if (status < 0) 3580 return status; 3581 status = device_create_file(dev, 3582 &dev_attr_suspend_mem_microvolts); 3583 if (status < 0) 3584 return status; 3585 status = device_create_file(dev, 3586 &dev_attr_suspend_disk_microvolts); 3587 if (status < 0) 3588 return status; 3589 } 3590 3591 if (ops->set_suspend_mode) { 3592 status = device_create_file(dev, 3593 &dev_attr_suspend_standby_mode); 3594 if (status < 0) 3595 return status; 3596 status = device_create_file(dev, 3597 &dev_attr_suspend_mem_mode); 3598 if (status < 0) 3599 return status; 3600 status = device_create_file(dev, 3601 &dev_attr_suspend_disk_mode); 3602 if (status < 0) 3603 return status; 3604 } 3605 3606 return status; 3607} 3608 3609static void rdev_init_debugfs(struct regulator_dev *rdev) 3610{ 3611 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3612 if (!rdev->debugfs) { 3613 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3614 return; 3615 } 3616 3617 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3618 &rdev->use_count); 3619 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3620 &rdev->open_count); 3621 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3622 &rdev->bypass_count); 3623} 3624 3625/** 3626 * regulator_register - register regulator 3627 * @regulator_desc: regulator to register 3628 * @config: runtime configuration for regulator 3629 * 3630 * Called by regulator drivers to register a regulator. 3631 * Returns a valid pointer to struct regulator_dev on success 3632 * or an ERR_PTR() on error. 3633 */ 3634struct regulator_dev * 3635regulator_register(const struct regulator_desc *regulator_desc, 3636 const struct regulator_config *config) 3637{ 3638 const struct regulation_constraints *constraints = NULL; 3639 const struct regulator_init_data *init_data; 3640 static atomic_t regulator_no = ATOMIC_INIT(0); 3641 struct regulator_dev *rdev; 3642 struct device *dev; 3643 int ret, i; 3644 const char *supply = NULL; 3645 3646 if (regulator_desc == NULL || config == NULL) 3647 return ERR_PTR(-EINVAL); 3648 3649 dev = config->dev; 3650 WARN_ON(!dev); 3651 3652 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3653 return ERR_PTR(-EINVAL); 3654 3655 if (regulator_desc->type != REGULATOR_VOLTAGE && 3656 regulator_desc->type != REGULATOR_CURRENT) 3657 return ERR_PTR(-EINVAL); 3658 3659 /* Only one of each should be implemented */ 3660 WARN_ON(regulator_desc->ops->get_voltage && 3661 regulator_desc->ops->get_voltage_sel); 3662 WARN_ON(regulator_desc->ops->set_voltage && 3663 regulator_desc->ops->set_voltage_sel); 3664 3665 /* If we're using selectors we must implement list_voltage. */ 3666 if (regulator_desc->ops->get_voltage_sel && 3667 !regulator_desc->ops->list_voltage) { 3668 return ERR_PTR(-EINVAL); 3669 } 3670 if (regulator_desc->ops->set_voltage_sel && 3671 !regulator_desc->ops->list_voltage) { 3672 return ERR_PTR(-EINVAL); 3673 } 3674 3675 init_data = config->init_data; 3676 3677 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3678 if (rdev == NULL) 3679 return ERR_PTR(-ENOMEM); 3680 3681 mutex_lock(®ulator_list_mutex); 3682 3683 mutex_init(&rdev->mutex); 3684 rdev->reg_data = config->driver_data; 3685 rdev->owner = regulator_desc->owner; 3686 rdev->desc = regulator_desc; 3687 if (config->regmap) 3688 rdev->regmap = config->regmap; 3689 else if (dev_get_regmap(dev, NULL)) 3690 rdev->regmap = dev_get_regmap(dev, NULL); 3691 else if (dev->parent) 3692 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3693 INIT_LIST_HEAD(&rdev->consumer_list); 3694 INIT_LIST_HEAD(&rdev->list); 3695 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3696 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3697 3698 /* preform any regulator specific init */ 3699 if (init_data && init_data->regulator_init) { 3700 ret = init_data->regulator_init(rdev->reg_data); 3701 if (ret < 0) 3702 goto clean; 3703 } 3704 3705 /* register with sysfs */ 3706 rdev->dev.class = ®ulator_class; 3707 rdev->dev.of_node = config->of_node; 3708 rdev->dev.parent = dev; 3709 dev_set_name(&rdev->dev, "regulator.%d", 3710 atomic_inc_return(®ulator_no) - 1); 3711 ret = device_register(&rdev->dev); 3712 if (ret != 0) { 3713 put_device(&rdev->dev); 3714 goto clean; 3715 } 3716 3717 dev_set_drvdata(&rdev->dev, rdev); 3718 3719 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3720 ret = regulator_ena_gpio_request(rdev, config); 3721 if (ret != 0) { 3722 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3723 config->ena_gpio, ret); 3724 goto wash; 3725 } 3726 3727 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3728 rdev->ena_gpio_state = 1; 3729 3730 if (config->ena_gpio_invert) 3731 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3732 } 3733 3734 /* set regulator constraints */ 3735 if (init_data) 3736 constraints = &init_data->constraints; 3737 3738 ret = set_machine_constraints(rdev, constraints); 3739 if (ret < 0) 3740 goto scrub; 3741 3742 /* add attributes supported by this regulator */ 3743 ret = add_regulator_attributes(rdev); 3744 if (ret < 0) 3745 goto scrub; 3746 3747 if (init_data && init_data->supply_regulator) 3748 supply = init_data->supply_regulator; 3749 else if (regulator_desc->supply_name) 3750 supply = regulator_desc->supply_name; 3751 3752 if (supply) { 3753 struct regulator_dev *r; 3754 3755 r = regulator_dev_lookup(dev, supply, &ret); 3756 3757 if (ret == -ENODEV) { 3758 /* 3759 * No supply was specified for this regulator and 3760 * there will never be one. 3761 */ 3762 ret = 0; 3763 goto add_dev; 3764 } else if (!r) { 3765 dev_err(dev, "Failed to find supply %s\n", supply); 3766 ret = -EPROBE_DEFER; 3767 goto scrub; 3768 } 3769 3770 ret = set_supply(rdev, r); 3771 if (ret < 0) 3772 goto scrub; 3773 3774 /* Enable supply if rail is enabled */ 3775 if (_regulator_is_enabled(rdev)) { 3776 ret = regulator_enable(rdev->supply); 3777 if (ret < 0) 3778 goto scrub; 3779 } 3780 } 3781 3782add_dev: 3783 /* add consumers devices */ 3784 if (init_data) { 3785 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3786 ret = set_consumer_device_supply(rdev, 3787 init_data->consumer_supplies[i].dev_name, 3788 init_data->consumer_supplies[i].supply); 3789 if (ret < 0) { 3790 dev_err(dev, "Failed to set supply %s\n", 3791 init_data->consumer_supplies[i].supply); 3792 goto unset_supplies; 3793 } 3794 } 3795 } 3796 3797 list_add(&rdev->list, ®ulator_list); 3798 3799 rdev_init_debugfs(rdev); 3800out: 3801 mutex_unlock(®ulator_list_mutex); 3802 return rdev; 3803 3804unset_supplies: 3805 unset_regulator_supplies(rdev); 3806 3807scrub: 3808 if (rdev->supply) 3809 _regulator_put(rdev->supply); 3810 regulator_ena_gpio_free(rdev); 3811 kfree(rdev->constraints); 3812wash: 3813 device_unregister(&rdev->dev); 3814 /* device core frees rdev */ 3815 rdev = ERR_PTR(ret); 3816 goto out; 3817 3818clean: 3819 kfree(rdev); 3820 rdev = ERR_PTR(ret); 3821 goto out; 3822} 3823EXPORT_SYMBOL_GPL(regulator_register); 3824 3825/** 3826 * regulator_unregister - unregister regulator 3827 * @rdev: regulator to unregister 3828 * 3829 * Called by regulator drivers to unregister a regulator. 3830 */ 3831void regulator_unregister(struct regulator_dev *rdev) 3832{ 3833 if (rdev == NULL) 3834 return; 3835 3836 if (rdev->supply) 3837 regulator_put(rdev->supply); 3838 mutex_lock(®ulator_list_mutex); 3839 debugfs_remove_recursive(rdev->debugfs); 3840 flush_work(&rdev->disable_work.work); 3841 WARN_ON(rdev->open_count); 3842 unset_regulator_supplies(rdev); 3843 list_del(&rdev->list); 3844 kfree(rdev->constraints); 3845 regulator_ena_gpio_free(rdev); 3846 device_unregister(&rdev->dev); 3847 mutex_unlock(®ulator_list_mutex); 3848} 3849EXPORT_SYMBOL_GPL(regulator_unregister); 3850 3851/** 3852 * regulator_suspend_prepare - prepare regulators for system wide suspend 3853 * @state: system suspend state 3854 * 3855 * Configure each regulator with it's suspend operating parameters for state. 3856 * This will usually be called by machine suspend code prior to supending. 3857 */ 3858int regulator_suspend_prepare(suspend_state_t state) 3859{ 3860 struct regulator_dev *rdev; 3861 int ret = 0; 3862 3863 /* ON is handled by regulator active state */ 3864 if (state == PM_SUSPEND_ON) 3865 return -EINVAL; 3866 3867 mutex_lock(®ulator_list_mutex); 3868 list_for_each_entry(rdev, ®ulator_list, list) { 3869 3870 mutex_lock(&rdev->mutex); 3871 ret = suspend_prepare(rdev, state); 3872 mutex_unlock(&rdev->mutex); 3873 3874 if (ret < 0) { 3875 rdev_err(rdev, "failed to prepare\n"); 3876 goto out; 3877 } 3878 } 3879out: 3880 mutex_unlock(®ulator_list_mutex); 3881 return ret; 3882} 3883EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3884 3885/** 3886 * regulator_suspend_finish - resume regulators from system wide suspend 3887 * 3888 * Turn on regulators that might be turned off by regulator_suspend_prepare 3889 * and that should be turned on according to the regulators properties. 3890 */ 3891int regulator_suspend_finish(void) 3892{ 3893 struct regulator_dev *rdev; 3894 int ret = 0, error; 3895 3896 mutex_lock(®ulator_list_mutex); 3897 list_for_each_entry(rdev, ®ulator_list, list) { 3898 struct regulator_ops *ops = rdev->desc->ops; 3899 3900 mutex_lock(&rdev->mutex); 3901 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3902 ops->enable) { 3903 error = ops->enable(rdev); 3904 if (error) 3905 ret = error; 3906 } else { 3907 if (!has_full_constraints) 3908 goto unlock; 3909 if (!ops->disable) 3910 goto unlock; 3911 if (!_regulator_is_enabled(rdev)) 3912 goto unlock; 3913 3914 error = ops->disable(rdev); 3915 if (error) 3916 ret = error; 3917 } 3918unlock: 3919 mutex_unlock(&rdev->mutex); 3920 } 3921 mutex_unlock(®ulator_list_mutex); 3922 return ret; 3923} 3924EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3925 3926/** 3927 * regulator_has_full_constraints - the system has fully specified constraints 3928 * 3929 * Calling this function will cause the regulator API to disable all 3930 * regulators which have a zero use count and don't have an always_on 3931 * constraint in a late_initcall. 3932 * 3933 * The intention is that this will become the default behaviour in a 3934 * future kernel release so users are encouraged to use this facility 3935 * now. 3936 */ 3937void regulator_has_full_constraints(void) 3938{ 3939 has_full_constraints = 1; 3940} 3941EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3942 3943/** 3944 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3945 * 3946 * Calling this function will cause the regulator API to provide a 3947 * dummy regulator to consumers if no physical regulator is found, 3948 * allowing most consumers to proceed as though a regulator were 3949 * configured. This allows systems such as those with software 3950 * controllable regulators for the CPU core only to be brought up more 3951 * readily. 3952 */ 3953void regulator_use_dummy_regulator(void) 3954{ 3955 board_wants_dummy_regulator = true; 3956} 3957EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3958 3959/** 3960 * rdev_get_drvdata - get rdev regulator driver data 3961 * @rdev: regulator 3962 * 3963 * Get rdev regulator driver private data. This call can be used in the 3964 * regulator driver context. 3965 */ 3966void *rdev_get_drvdata(struct regulator_dev *rdev) 3967{ 3968 return rdev->reg_data; 3969} 3970EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3971 3972/** 3973 * regulator_get_drvdata - get regulator driver data 3974 * @regulator: regulator 3975 * 3976 * Get regulator driver private data. This call can be used in the consumer 3977 * driver context when non API regulator specific functions need to be called. 3978 */ 3979void *regulator_get_drvdata(struct regulator *regulator) 3980{ 3981 return regulator->rdev->reg_data; 3982} 3983EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3984 3985/** 3986 * regulator_set_drvdata - set regulator driver data 3987 * @regulator: regulator 3988 * @data: data 3989 */ 3990void regulator_set_drvdata(struct regulator *regulator, void *data) 3991{ 3992 regulator->rdev->reg_data = data; 3993} 3994EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3995 3996/** 3997 * regulator_get_id - get regulator ID 3998 * @rdev: regulator 3999 */ 4000int rdev_get_id(struct regulator_dev *rdev) 4001{ 4002 return rdev->desc->id; 4003} 4004EXPORT_SYMBOL_GPL(rdev_get_id); 4005 4006struct device *rdev_get_dev(struct regulator_dev *rdev) 4007{ 4008 return &rdev->dev; 4009} 4010EXPORT_SYMBOL_GPL(rdev_get_dev); 4011 4012void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 4013{ 4014 return reg_init_data->driver_data; 4015} 4016EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 4017 4018#ifdef CONFIG_DEBUG_FS 4019static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 4020 size_t count, loff_t *ppos) 4021{ 4022 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 4023 ssize_t len, ret = 0; 4024 struct regulator_map *map; 4025 4026 if (!buf) 4027 return -ENOMEM; 4028 4029 list_for_each_entry(map, ®ulator_map_list, list) { 4030 len = snprintf(buf + ret, PAGE_SIZE - ret, 4031 "%s -> %s.%s\n", 4032 rdev_get_name(map->regulator), map->dev_name, 4033 map->supply); 4034 if (len >= 0) 4035 ret += len; 4036 if (ret > PAGE_SIZE) { 4037 ret = PAGE_SIZE; 4038 break; 4039 } 4040 } 4041 4042 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 4043 4044 kfree(buf); 4045 4046 return ret; 4047} 4048#endif 4049 4050static const struct file_operations supply_map_fops = { 4051#ifdef CONFIG_DEBUG_FS 4052 .read = supply_map_read_file, 4053 .llseek = default_llseek, 4054#endif 4055}; 4056 4057static int __init regulator_init(void) 4058{ 4059 int ret; 4060 4061 ret = class_register(®ulator_class); 4062 4063 debugfs_root = debugfs_create_dir("regulator", NULL); 4064 if (!debugfs_root) 4065 pr_warn("regulator: Failed to create debugfs directory\n"); 4066 4067 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 4068 &supply_map_fops); 4069 4070 regulator_dummy_init(); 4071 4072 return ret; 4073} 4074 4075/* init early to allow our consumers to complete system booting */ 4076core_initcall(regulator_init); 4077 4078static int __init regulator_init_complete(void) 4079{ 4080 struct regulator_dev *rdev; 4081 struct regulator_ops *ops; 4082 struct regulation_constraints *c; 4083 int enabled, ret; 4084 4085 /* 4086 * Since DT doesn't provide an idiomatic mechanism for 4087 * enabling full constraints and since it's much more natural 4088 * with DT to provide them just assume that a DT enabled 4089 * system has full constraints. 4090 */ 4091 if (of_have_populated_dt()) 4092 has_full_constraints = true; 4093 4094 mutex_lock(®ulator_list_mutex); 4095 4096 /* If we have a full configuration then disable any regulators 4097 * which are not in use or always_on. This will become the 4098 * default behaviour in the future. 4099 */ 4100 list_for_each_entry(rdev, ®ulator_list, list) { 4101 ops = rdev->desc->ops; 4102 c = rdev->constraints; 4103 4104 if (!ops->disable || (c && c->always_on)) 4105 continue; 4106 4107 mutex_lock(&rdev->mutex); 4108 4109 if (rdev->use_count) 4110 goto unlock; 4111 4112 /* If we can't read the status assume it's on. */ 4113 if (ops->is_enabled) 4114 enabled = ops->is_enabled(rdev); 4115 else 4116 enabled = 1; 4117 4118 if (!enabled) 4119 goto unlock; 4120 4121 if (has_full_constraints) { 4122 /* We log since this may kill the system if it 4123 * goes wrong. */ 4124 rdev_info(rdev, "disabling\n"); 4125 ret = ops->disable(rdev); 4126 if (ret != 0) { 4127 rdev_err(rdev, "couldn't disable: %d\n", ret); 4128 } 4129 } else { 4130 /* The intention is that in future we will 4131 * assume that full constraints are provided 4132 * so warn even if we aren't going to do 4133 * anything here. 4134 */ 4135 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 4136 } 4137 4138unlock: 4139 mutex_unlock(&rdev->mutex); 4140 } 4141 4142 mutex_unlock(®ulator_list_mutex); 4143 4144 return 0; 4145} 4146late_initcall(regulator_init_complete); 4147