core.c revision f19b00da8ed37db4e3891fe534fcf3a605a0e562
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 * retruns 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; 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 if (board_wants_dummy_regulator) { 1263 rdev = dummy_regulator_rdev; 1264 goto found; 1265 } 1266 1267#ifdef CONFIG_REGULATOR_DUMMY 1268 if (!devname) 1269 devname = "deviceless"; 1270 1271 /* If the board didn't flag that it was fully constrained then 1272 * substitute in a dummy regulator so consumers can continue. 1273 */ 1274 if (!has_full_constraints) { 1275 pr_warn("%s supply %s not found, using dummy regulator\n", 1276 devname, id); 1277 rdev = dummy_regulator_rdev; 1278 goto found; 1279 } 1280#endif 1281 1282 mutex_unlock(®ulator_list_mutex); 1283 return regulator; 1284 1285found: 1286 if (rdev->exclusive) { 1287 regulator = ERR_PTR(-EPERM); 1288 goto out; 1289 } 1290 1291 if (exclusive && rdev->open_count) { 1292 regulator = ERR_PTR(-EBUSY); 1293 goto out; 1294 } 1295 1296 if (!try_module_get(rdev->owner)) 1297 goto out; 1298 1299 regulator = create_regulator(rdev, dev, id); 1300 if (regulator == NULL) { 1301 regulator = ERR_PTR(-ENOMEM); 1302 module_put(rdev->owner); 1303 goto out; 1304 } 1305 1306 rdev->open_count++; 1307 if (exclusive) { 1308 rdev->exclusive = 1; 1309 1310 ret = _regulator_is_enabled(rdev); 1311 if (ret > 0) 1312 rdev->use_count = 1; 1313 else 1314 rdev->use_count = 0; 1315 } 1316 1317out: 1318 mutex_unlock(®ulator_list_mutex); 1319 1320 return regulator; 1321} 1322 1323/** 1324 * regulator_get - lookup and obtain a reference to a regulator. 1325 * @dev: device for regulator "consumer" 1326 * @id: Supply name or regulator ID. 1327 * 1328 * Returns a struct regulator corresponding to the regulator producer, 1329 * or IS_ERR() condition containing errno. 1330 * 1331 * Use of supply names configured via regulator_set_device_supply() is 1332 * strongly encouraged. It is recommended that the supply name used 1333 * should match the name used for the supply and/or the relevant 1334 * device pins in the datasheet. 1335 */ 1336struct regulator *regulator_get(struct device *dev, const char *id) 1337{ 1338 return _regulator_get(dev, id, 0); 1339} 1340EXPORT_SYMBOL_GPL(regulator_get); 1341 1342static void devm_regulator_release(struct device *dev, void *res) 1343{ 1344 regulator_put(*(struct regulator **)res); 1345} 1346 1347/** 1348 * devm_regulator_get - Resource managed regulator_get() 1349 * @dev: device for regulator "consumer" 1350 * @id: Supply name or regulator ID. 1351 * 1352 * Managed regulator_get(). Regulators returned from this function are 1353 * automatically regulator_put() on driver detach. See regulator_get() for more 1354 * information. 1355 */ 1356struct regulator *devm_regulator_get(struct device *dev, const char *id) 1357{ 1358 struct regulator **ptr, *regulator; 1359 1360 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1361 if (!ptr) 1362 return ERR_PTR(-ENOMEM); 1363 1364 regulator = regulator_get(dev, id); 1365 if (!IS_ERR(regulator)) { 1366 *ptr = regulator; 1367 devres_add(dev, ptr); 1368 } else { 1369 devres_free(ptr); 1370 } 1371 1372 return regulator; 1373} 1374EXPORT_SYMBOL_GPL(devm_regulator_get); 1375 1376/** 1377 * regulator_get_exclusive - obtain exclusive access to a regulator. 1378 * @dev: device for regulator "consumer" 1379 * @id: Supply name or regulator ID. 1380 * 1381 * Returns a struct regulator corresponding to the regulator producer, 1382 * or IS_ERR() condition containing errno. Other consumers will be 1383 * unable to obtain this reference is held and the use count for the 1384 * regulator will be initialised to reflect the current state of the 1385 * regulator. 1386 * 1387 * This is intended for use by consumers which cannot tolerate shared 1388 * use of the regulator such as those which need to force the 1389 * regulator off for correct operation of the hardware they are 1390 * controlling. 1391 * 1392 * Use of supply names configured via regulator_set_device_supply() is 1393 * strongly encouraged. It is recommended that the supply name used 1394 * should match the name used for the supply and/or the relevant 1395 * device pins in the datasheet. 1396 */ 1397struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1398{ 1399 return _regulator_get(dev, id, 1); 1400} 1401EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1402 1403/* Locks held by regulator_put() */ 1404static void _regulator_put(struct regulator *regulator) 1405{ 1406 struct regulator_dev *rdev; 1407 1408 if (regulator == NULL || IS_ERR(regulator)) 1409 return; 1410 1411 rdev = regulator->rdev; 1412 1413 debugfs_remove_recursive(regulator->debugfs); 1414 1415 /* remove any sysfs entries */ 1416 if (regulator->dev) 1417 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1418 kfree(regulator->supply_name); 1419 list_del(®ulator->list); 1420 kfree(regulator); 1421 1422 rdev->open_count--; 1423 rdev->exclusive = 0; 1424 1425 module_put(rdev->owner); 1426} 1427 1428/** 1429 * regulator_put - "free" the regulator source 1430 * @regulator: regulator source 1431 * 1432 * Note: drivers must ensure that all regulator_enable calls made on this 1433 * regulator source are balanced by regulator_disable calls prior to calling 1434 * this function. 1435 */ 1436void regulator_put(struct regulator *regulator) 1437{ 1438 mutex_lock(®ulator_list_mutex); 1439 _regulator_put(regulator); 1440 mutex_unlock(®ulator_list_mutex); 1441} 1442EXPORT_SYMBOL_GPL(regulator_put); 1443 1444static int devm_regulator_match(struct device *dev, void *res, void *data) 1445{ 1446 struct regulator **r = res; 1447 if (!r || !*r) { 1448 WARN_ON(!r || !*r); 1449 return 0; 1450 } 1451 return *r == data; 1452} 1453 1454/** 1455 * devm_regulator_put - Resource managed regulator_put() 1456 * @regulator: regulator to free 1457 * 1458 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1459 * this function will not need to be called and the resource management 1460 * code will ensure that the resource is freed. 1461 */ 1462void devm_regulator_put(struct regulator *regulator) 1463{ 1464 int rc; 1465 1466 rc = devres_release(regulator->dev, devm_regulator_release, 1467 devm_regulator_match, regulator); 1468 if (rc != 0) 1469 WARN_ON(rc); 1470} 1471EXPORT_SYMBOL_GPL(devm_regulator_put); 1472 1473/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1474static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1475 const struct regulator_config *config) 1476{ 1477 struct regulator_enable_gpio *pin; 1478 int ret; 1479 1480 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1481 if (pin->gpio == config->ena_gpio) { 1482 rdev_dbg(rdev, "GPIO %d is already used\n", 1483 config->ena_gpio); 1484 goto update_ena_gpio_to_rdev; 1485 } 1486 } 1487 1488 ret = gpio_request_one(config->ena_gpio, 1489 GPIOF_DIR_OUT | config->ena_gpio_flags, 1490 rdev_get_name(rdev)); 1491 if (ret) 1492 return ret; 1493 1494 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1495 if (pin == NULL) { 1496 gpio_free(config->ena_gpio); 1497 return -ENOMEM; 1498 } 1499 1500 pin->gpio = config->ena_gpio; 1501 pin->ena_gpio_invert = config->ena_gpio_invert; 1502 list_add(&pin->list, ®ulator_ena_gpio_list); 1503 1504update_ena_gpio_to_rdev: 1505 pin->request_count++; 1506 rdev->ena_pin = pin; 1507 return 0; 1508} 1509 1510static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1511{ 1512 struct regulator_enable_gpio *pin, *n; 1513 1514 if (!rdev->ena_pin) 1515 return; 1516 1517 /* Free the GPIO only in case of no use */ 1518 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1519 if (pin->gpio == rdev->ena_pin->gpio) { 1520 if (pin->request_count <= 1) { 1521 pin->request_count = 0; 1522 gpio_free(pin->gpio); 1523 list_del(&pin->list); 1524 kfree(pin); 1525 } else { 1526 pin->request_count--; 1527 } 1528 } 1529 } 1530} 1531 1532static int _regulator_do_enable(struct regulator_dev *rdev) 1533{ 1534 int ret, delay; 1535 1536 /* Query before enabling in case configuration dependent. */ 1537 ret = _regulator_get_enable_time(rdev); 1538 if (ret >= 0) { 1539 delay = ret; 1540 } else { 1541 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1542 delay = 0; 1543 } 1544 1545 trace_regulator_enable(rdev_get_name(rdev)); 1546 1547 if (rdev->ena_gpio) { 1548 gpio_set_value_cansleep(rdev->ena_gpio, 1549 !rdev->ena_gpio_invert); 1550 rdev->ena_gpio_state = 1; 1551 } else if (rdev->desc->ops->enable) { 1552 ret = rdev->desc->ops->enable(rdev); 1553 if (ret < 0) 1554 return ret; 1555 } else { 1556 return -EINVAL; 1557 } 1558 1559 /* Allow the regulator to ramp; it would be useful to extend 1560 * this for bulk operations so that the regulators can ramp 1561 * together. */ 1562 trace_regulator_enable_delay(rdev_get_name(rdev)); 1563 1564 if (delay >= 1000) { 1565 mdelay(delay / 1000); 1566 udelay(delay % 1000); 1567 } else if (delay) { 1568 udelay(delay); 1569 } 1570 1571 trace_regulator_enable_complete(rdev_get_name(rdev)); 1572 1573 return 0; 1574} 1575 1576/* locks held by regulator_enable() */ 1577static int _regulator_enable(struct regulator_dev *rdev) 1578{ 1579 int ret; 1580 1581 /* check voltage and requested load before enabling */ 1582 if (rdev->constraints && 1583 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1584 drms_uA_update(rdev); 1585 1586 if (rdev->use_count == 0) { 1587 /* The regulator may on if it's not switchable or left on */ 1588 ret = _regulator_is_enabled(rdev); 1589 if (ret == -EINVAL || ret == 0) { 1590 if (!_regulator_can_change_status(rdev)) 1591 return -EPERM; 1592 1593 ret = _regulator_do_enable(rdev); 1594 if (ret < 0) 1595 return ret; 1596 1597 } else if (ret < 0) { 1598 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1599 return ret; 1600 } 1601 /* Fallthrough on positive return values - already enabled */ 1602 } 1603 1604 rdev->use_count++; 1605 1606 return 0; 1607} 1608 1609/** 1610 * regulator_enable - enable regulator output 1611 * @regulator: regulator source 1612 * 1613 * Request that the regulator be enabled with the regulator output at 1614 * the predefined voltage or current value. Calls to regulator_enable() 1615 * must be balanced with calls to regulator_disable(). 1616 * 1617 * NOTE: the output value can be set by other drivers, boot loader or may be 1618 * hardwired in the regulator. 1619 */ 1620int regulator_enable(struct regulator *regulator) 1621{ 1622 struct regulator_dev *rdev = regulator->rdev; 1623 int ret = 0; 1624 1625 if (regulator->always_on) 1626 return 0; 1627 1628 if (rdev->supply) { 1629 ret = regulator_enable(rdev->supply); 1630 if (ret != 0) 1631 return ret; 1632 } 1633 1634 mutex_lock(&rdev->mutex); 1635 ret = _regulator_enable(rdev); 1636 mutex_unlock(&rdev->mutex); 1637 1638 if (ret != 0 && rdev->supply) 1639 regulator_disable(rdev->supply); 1640 1641 return ret; 1642} 1643EXPORT_SYMBOL_GPL(regulator_enable); 1644 1645static int _regulator_do_disable(struct regulator_dev *rdev) 1646{ 1647 int ret; 1648 1649 trace_regulator_disable(rdev_get_name(rdev)); 1650 1651 if (rdev->ena_gpio) { 1652 gpio_set_value_cansleep(rdev->ena_gpio, 1653 rdev->ena_gpio_invert); 1654 rdev->ena_gpio_state = 0; 1655 1656 } else if (rdev->desc->ops->disable) { 1657 ret = rdev->desc->ops->disable(rdev); 1658 if (ret != 0) 1659 return ret; 1660 } 1661 1662 trace_regulator_disable_complete(rdev_get_name(rdev)); 1663 1664 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1665 NULL); 1666 return 0; 1667} 1668 1669/* locks held by regulator_disable() */ 1670static int _regulator_disable(struct regulator_dev *rdev) 1671{ 1672 int ret = 0; 1673 1674 if (WARN(rdev->use_count <= 0, 1675 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1676 return -EIO; 1677 1678 /* are we the last user and permitted to disable ? */ 1679 if (rdev->use_count == 1 && 1680 (rdev->constraints && !rdev->constraints->always_on)) { 1681 1682 /* we are last user */ 1683 if (_regulator_can_change_status(rdev)) { 1684 ret = _regulator_do_disable(rdev); 1685 if (ret < 0) { 1686 rdev_err(rdev, "failed to disable\n"); 1687 return ret; 1688 } 1689 } 1690 1691 rdev->use_count = 0; 1692 } else if (rdev->use_count > 1) { 1693 1694 if (rdev->constraints && 1695 (rdev->constraints->valid_ops_mask & 1696 REGULATOR_CHANGE_DRMS)) 1697 drms_uA_update(rdev); 1698 1699 rdev->use_count--; 1700 } 1701 1702 return ret; 1703} 1704 1705/** 1706 * regulator_disable - disable regulator output 1707 * @regulator: regulator source 1708 * 1709 * Disable the regulator output voltage or current. Calls to 1710 * regulator_enable() must be balanced with calls to 1711 * regulator_disable(). 1712 * 1713 * NOTE: this will only disable the regulator output if no other consumer 1714 * devices have it enabled, the regulator device supports disabling and 1715 * machine constraints permit this operation. 1716 */ 1717int regulator_disable(struct regulator *regulator) 1718{ 1719 struct regulator_dev *rdev = regulator->rdev; 1720 int ret = 0; 1721 1722 if (regulator->always_on) 1723 return 0; 1724 1725 mutex_lock(&rdev->mutex); 1726 ret = _regulator_disable(rdev); 1727 mutex_unlock(&rdev->mutex); 1728 1729 if (ret == 0 && rdev->supply) 1730 regulator_disable(rdev->supply); 1731 1732 return ret; 1733} 1734EXPORT_SYMBOL_GPL(regulator_disable); 1735 1736/* locks held by regulator_force_disable() */ 1737static int _regulator_force_disable(struct regulator_dev *rdev) 1738{ 1739 int ret = 0; 1740 1741 /* force disable */ 1742 if (rdev->desc->ops->disable) { 1743 /* ah well, who wants to live forever... */ 1744 ret = rdev->desc->ops->disable(rdev); 1745 if (ret < 0) { 1746 rdev_err(rdev, "failed to force disable\n"); 1747 return ret; 1748 } 1749 /* notify other consumers that power has been forced off */ 1750 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1751 REGULATOR_EVENT_DISABLE, NULL); 1752 } 1753 1754 return ret; 1755} 1756 1757/** 1758 * regulator_force_disable - force disable regulator output 1759 * @regulator: regulator source 1760 * 1761 * Forcibly disable the regulator output voltage or current. 1762 * NOTE: this *will* disable the regulator output even if other consumer 1763 * devices have it enabled. This should be used for situations when device 1764 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1765 */ 1766int regulator_force_disable(struct regulator *regulator) 1767{ 1768 struct regulator_dev *rdev = regulator->rdev; 1769 int ret; 1770 1771 mutex_lock(&rdev->mutex); 1772 regulator->uA_load = 0; 1773 ret = _regulator_force_disable(regulator->rdev); 1774 mutex_unlock(&rdev->mutex); 1775 1776 if (rdev->supply) 1777 while (rdev->open_count--) 1778 regulator_disable(rdev->supply); 1779 1780 return ret; 1781} 1782EXPORT_SYMBOL_GPL(regulator_force_disable); 1783 1784static void regulator_disable_work(struct work_struct *work) 1785{ 1786 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1787 disable_work.work); 1788 int count, i, ret; 1789 1790 mutex_lock(&rdev->mutex); 1791 1792 BUG_ON(!rdev->deferred_disables); 1793 1794 count = rdev->deferred_disables; 1795 rdev->deferred_disables = 0; 1796 1797 for (i = 0; i < count; i++) { 1798 ret = _regulator_disable(rdev); 1799 if (ret != 0) 1800 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1801 } 1802 1803 mutex_unlock(&rdev->mutex); 1804 1805 if (rdev->supply) { 1806 for (i = 0; i < count; i++) { 1807 ret = regulator_disable(rdev->supply); 1808 if (ret != 0) { 1809 rdev_err(rdev, 1810 "Supply disable failed: %d\n", ret); 1811 } 1812 } 1813 } 1814} 1815 1816/** 1817 * regulator_disable_deferred - disable regulator output with delay 1818 * @regulator: regulator source 1819 * @ms: miliseconds until the regulator is disabled 1820 * 1821 * Execute regulator_disable() on the regulator after a delay. This 1822 * is intended for use with devices that require some time to quiesce. 1823 * 1824 * NOTE: this will only disable the regulator output if no other consumer 1825 * devices have it enabled, the regulator device supports disabling and 1826 * machine constraints permit this operation. 1827 */ 1828int regulator_disable_deferred(struct regulator *regulator, int ms) 1829{ 1830 struct regulator_dev *rdev = regulator->rdev; 1831 int ret; 1832 1833 if (regulator->always_on) 1834 return 0; 1835 1836 if (!ms) 1837 return regulator_disable(regulator); 1838 1839 mutex_lock(&rdev->mutex); 1840 rdev->deferred_disables++; 1841 mutex_unlock(&rdev->mutex); 1842 1843 ret = schedule_delayed_work(&rdev->disable_work, 1844 msecs_to_jiffies(ms)); 1845 if (ret < 0) 1846 return ret; 1847 else 1848 return 0; 1849} 1850EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1851 1852/** 1853 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1854 * 1855 * @rdev: regulator to operate on 1856 * 1857 * Regulators that use regmap for their register I/O can set the 1858 * enable_reg and enable_mask fields in their descriptor and then use 1859 * this as their is_enabled operation, saving some code. 1860 */ 1861int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1862{ 1863 unsigned int val; 1864 int ret; 1865 1866 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1867 if (ret != 0) 1868 return ret; 1869 1870 return (val & rdev->desc->enable_mask) != 0; 1871} 1872EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1873 1874/** 1875 * regulator_enable_regmap - standard enable() for regmap users 1876 * 1877 * @rdev: regulator to operate on 1878 * 1879 * Regulators that use regmap for their register I/O can set the 1880 * enable_reg and enable_mask fields in their descriptor and then use 1881 * this as their enable() operation, saving some code. 1882 */ 1883int regulator_enable_regmap(struct regulator_dev *rdev) 1884{ 1885 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1886 rdev->desc->enable_mask, 1887 rdev->desc->enable_mask); 1888} 1889EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1890 1891/** 1892 * regulator_disable_regmap - standard disable() for regmap users 1893 * 1894 * @rdev: regulator to operate on 1895 * 1896 * Regulators that use regmap for their register I/O can set the 1897 * enable_reg and enable_mask fields in their descriptor and then use 1898 * this as their disable() operation, saving some code. 1899 */ 1900int regulator_disable_regmap(struct regulator_dev *rdev) 1901{ 1902 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1903 rdev->desc->enable_mask, 0); 1904} 1905EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1906 1907static int _regulator_is_enabled(struct regulator_dev *rdev) 1908{ 1909 /* A GPIO control always takes precedence */ 1910 if (rdev->ena_gpio) 1911 return rdev->ena_gpio_state; 1912 1913 /* If we don't know then assume that the regulator is always on */ 1914 if (!rdev->desc->ops->is_enabled) 1915 return 1; 1916 1917 return rdev->desc->ops->is_enabled(rdev); 1918} 1919 1920/** 1921 * regulator_is_enabled - is the regulator output enabled 1922 * @regulator: regulator source 1923 * 1924 * Returns positive if the regulator driver backing the source/client 1925 * has requested that the device be enabled, zero if it hasn't, else a 1926 * negative errno code. 1927 * 1928 * Note that the device backing this regulator handle can have multiple 1929 * users, so it might be enabled even if regulator_enable() was never 1930 * called for this particular source. 1931 */ 1932int regulator_is_enabled(struct regulator *regulator) 1933{ 1934 int ret; 1935 1936 if (regulator->always_on) 1937 return 1; 1938 1939 mutex_lock(®ulator->rdev->mutex); 1940 ret = _regulator_is_enabled(regulator->rdev); 1941 mutex_unlock(®ulator->rdev->mutex); 1942 1943 return ret; 1944} 1945EXPORT_SYMBOL_GPL(regulator_is_enabled); 1946 1947/** 1948 * regulator_can_change_voltage - check if regulator can change voltage 1949 * @regulator: regulator source 1950 * 1951 * Returns positive if the regulator driver backing the source/client 1952 * can change its voltage, false otherwise. Usefull for detecting fixed 1953 * or dummy regulators and disabling voltage change logic in the client 1954 * driver. 1955 */ 1956int regulator_can_change_voltage(struct regulator *regulator) 1957{ 1958 struct regulator_dev *rdev = regulator->rdev; 1959 1960 if (rdev->constraints && 1961 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1962 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 1963 return 1; 1964 1965 if (rdev->desc->continuous_voltage_range && 1966 rdev->constraints->min_uV && rdev->constraints->max_uV && 1967 rdev->constraints->min_uV != rdev->constraints->max_uV) 1968 return 1; 1969 } 1970 1971 return 0; 1972} 1973EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 1974 1975/** 1976 * regulator_count_voltages - count regulator_list_voltage() selectors 1977 * @regulator: regulator source 1978 * 1979 * Returns number of selectors, or negative errno. Selectors are 1980 * numbered starting at zero, and typically correspond to bitfields 1981 * in hardware registers. 1982 */ 1983int regulator_count_voltages(struct regulator *regulator) 1984{ 1985 struct regulator_dev *rdev = regulator->rdev; 1986 1987 return rdev->desc->n_voltages ? : -EINVAL; 1988} 1989EXPORT_SYMBOL_GPL(regulator_count_voltages); 1990 1991/** 1992 * regulator_list_voltage_linear - List voltages with simple calculation 1993 * 1994 * @rdev: Regulator device 1995 * @selector: Selector to convert into a voltage 1996 * 1997 * Regulators with a simple linear mapping between voltages and 1998 * selectors can set min_uV and uV_step in the regulator descriptor 1999 * and then use this function as their list_voltage() operation, 2000 */ 2001int regulator_list_voltage_linear(struct regulator_dev *rdev, 2002 unsigned int selector) 2003{ 2004 if (selector >= rdev->desc->n_voltages) 2005 return -EINVAL; 2006 if (selector < rdev->desc->linear_min_sel) 2007 return 0; 2008 2009 selector -= rdev->desc->linear_min_sel; 2010 2011 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 2012} 2013EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 2014 2015/** 2016 * regulator_list_voltage_table - List voltages with table based mapping 2017 * 2018 * @rdev: Regulator device 2019 * @selector: Selector to convert into a voltage 2020 * 2021 * Regulators with table based mapping between voltages and 2022 * selectors can set volt_table in the regulator descriptor 2023 * and then use this function as their list_voltage() operation. 2024 */ 2025int regulator_list_voltage_table(struct regulator_dev *rdev, 2026 unsigned int selector) 2027{ 2028 if (!rdev->desc->volt_table) { 2029 BUG_ON(!rdev->desc->volt_table); 2030 return -EINVAL; 2031 } 2032 2033 if (selector >= rdev->desc->n_voltages) 2034 return -EINVAL; 2035 2036 return rdev->desc->volt_table[selector]; 2037} 2038EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 2039 2040/** 2041 * regulator_list_voltage - enumerate supported voltages 2042 * @regulator: regulator source 2043 * @selector: identify voltage to list 2044 * Context: can sleep 2045 * 2046 * Returns a voltage that can be passed to @regulator_set_voltage(), 2047 * zero if this selector code can't be used on this system, or a 2048 * negative errno. 2049 */ 2050int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2051{ 2052 struct regulator_dev *rdev = regulator->rdev; 2053 struct regulator_ops *ops = rdev->desc->ops; 2054 int ret; 2055 2056 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2057 return -EINVAL; 2058 2059 mutex_lock(&rdev->mutex); 2060 ret = ops->list_voltage(rdev, selector); 2061 mutex_unlock(&rdev->mutex); 2062 2063 if (ret > 0) { 2064 if (ret < rdev->constraints->min_uV) 2065 ret = 0; 2066 else if (ret > rdev->constraints->max_uV) 2067 ret = 0; 2068 } 2069 2070 return ret; 2071} 2072EXPORT_SYMBOL_GPL(regulator_list_voltage); 2073 2074/** 2075 * regulator_is_supported_voltage - check if a voltage range can be supported 2076 * 2077 * @regulator: Regulator to check. 2078 * @min_uV: Minimum required voltage in uV. 2079 * @max_uV: Maximum required voltage in uV. 2080 * 2081 * Returns a boolean or a negative error code. 2082 */ 2083int regulator_is_supported_voltage(struct regulator *regulator, 2084 int min_uV, int max_uV) 2085{ 2086 struct regulator_dev *rdev = regulator->rdev; 2087 int i, voltages, ret; 2088 2089 /* If we can't change voltage check the current voltage */ 2090 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2091 ret = regulator_get_voltage(regulator); 2092 if (ret >= 0) 2093 return (min_uV <= ret && ret <= max_uV); 2094 else 2095 return ret; 2096 } 2097 2098 /* Any voltage within constrains range is fine? */ 2099 if (rdev->desc->continuous_voltage_range) 2100 return min_uV >= rdev->constraints->min_uV && 2101 max_uV <= rdev->constraints->max_uV; 2102 2103 ret = regulator_count_voltages(regulator); 2104 if (ret < 0) 2105 return ret; 2106 voltages = ret; 2107 2108 for (i = 0; i < voltages; i++) { 2109 ret = regulator_list_voltage(regulator, i); 2110 2111 if (ret >= min_uV && ret <= max_uV) 2112 return 1; 2113 } 2114 2115 return 0; 2116} 2117EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2118 2119/** 2120 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2121 * 2122 * @rdev: regulator to operate on 2123 * 2124 * Regulators that use regmap for their register I/O can set the 2125 * vsel_reg and vsel_mask fields in their descriptor and then use this 2126 * as their get_voltage_vsel operation, saving some code. 2127 */ 2128int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2129{ 2130 unsigned int val; 2131 int ret; 2132 2133 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2134 if (ret != 0) 2135 return ret; 2136 2137 val &= rdev->desc->vsel_mask; 2138 val >>= ffs(rdev->desc->vsel_mask) - 1; 2139 2140 return val; 2141} 2142EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2143 2144/** 2145 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2146 * 2147 * @rdev: regulator to operate on 2148 * @sel: Selector to set 2149 * 2150 * Regulators that use regmap for their register I/O can set the 2151 * vsel_reg and vsel_mask fields in their descriptor and then use this 2152 * as their set_voltage_vsel operation, saving some code. 2153 */ 2154int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2155{ 2156 int ret; 2157 2158 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2159 2160 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2161 rdev->desc->vsel_mask, sel); 2162 if (ret) 2163 return ret; 2164 2165 if (rdev->desc->apply_bit) 2166 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, 2167 rdev->desc->apply_bit, 2168 rdev->desc->apply_bit); 2169 return ret; 2170} 2171EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2172 2173/** 2174 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2175 * 2176 * @rdev: Regulator to operate on 2177 * @min_uV: Lower bound for voltage 2178 * @max_uV: Upper bound for voltage 2179 * 2180 * Drivers implementing set_voltage_sel() and list_voltage() can use 2181 * this as their map_voltage() operation. It will find a suitable 2182 * voltage by calling list_voltage() until it gets something in bounds 2183 * for the requested voltages. 2184 */ 2185int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2186 int min_uV, int max_uV) 2187{ 2188 int best_val = INT_MAX; 2189 int selector = 0; 2190 int i, ret; 2191 2192 /* Find the smallest voltage that falls within the specified 2193 * range. 2194 */ 2195 for (i = 0; i < rdev->desc->n_voltages; i++) { 2196 ret = rdev->desc->ops->list_voltage(rdev, i); 2197 if (ret < 0) 2198 continue; 2199 2200 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2201 best_val = ret; 2202 selector = i; 2203 } 2204 } 2205 2206 if (best_val != INT_MAX) 2207 return selector; 2208 else 2209 return -EINVAL; 2210} 2211EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2212 2213/** 2214 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2215 * 2216 * @rdev: Regulator to operate on 2217 * @min_uV: Lower bound for voltage 2218 * @max_uV: Upper bound for voltage 2219 * 2220 * Drivers providing min_uV and uV_step in their regulator_desc can 2221 * use this as their map_voltage() operation. 2222 */ 2223int regulator_map_voltage_linear(struct regulator_dev *rdev, 2224 int min_uV, int max_uV) 2225{ 2226 int ret, voltage; 2227 2228 /* Allow uV_step to be 0 for fixed voltage */ 2229 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2230 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2231 return 0; 2232 else 2233 return -EINVAL; 2234 } 2235 2236 if (!rdev->desc->uV_step) { 2237 BUG_ON(!rdev->desc->uV_step); 2238 return -EINVAL; 2239 } 2240 2241 if (min_uV < rdev->desc->min_uV) 2242 min_uV = rdev->desc->min_uV; 2243 2244 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2245 if (ret < 0) 2246 return ret; 2247 2248 ret += rdev->desc->linear_min_sel; 2249 2250 /* Map back into a voltage to verify we're still in bounds */ 2251 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2252 if (voltage < min_uV || voltage > max_uV) 2253 return -EINVAL; 2254 2255 return ret; 2256} 2257EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2258 2259static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2260 int min_uV, int max_uV) 2261{ 2262 int ret; 2263 int delay = 0; 2264 int best_val = 0; 2265 unsigned int selector; 2266 int old_selector = -1; 2267 2268 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2269 2270 min_uV += rdev->constraints->uV_offset; 2271 max_uV += rdev->constraints->uV_offset; 2272 2273 /* 2274 * If we can't obtain the old selector there is not enough 2275 * info to call set_voltage_time_sel(). 2276 */ 2277 if (_regulator_is_enabled(rdev) && 2278 rdev->desc->ops->set_voltage_time_sel && 2279 rdev->desc->ops->get_voltage_sel) { 2280 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2281 if (old_selector < 0) 2282 return old_selector; 2283 } 2284 2285 if (rdev->desc->ops->set_voltage) { 2286 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2287 &selector); 2288 2289 if (ret >= 0) { 2290 if (rdev->desc->ops->list_voltage) 2291 best_val = rdev->desc->ops->list_voltage(rdev, 2292 selector); 2293 else 2294 best_val = _regulator_get_voltage(rdev); 2295 } 2296 2297 } else if (rdev->desc->ops->set_voltage_sel) { 2298 if (rdev->desc->ops->map_voltage) { 2299 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2300 max_uV); 2301 } else { 2302 if (rdev->desc->ops->list_voltage == 2303 regulator_list_voltage_linear) 2304 ret = regulator_map_voltage_linear(rdev, 2305 min_uV, max_uV); 2306 else 2307 ret = regulator_map_voltage_iterate(rdev, 2308 min_uV, max_uV); 2309 } 2310 2311 if (ret >= 0) { 2312 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2313 if (min_uV <= best_val && max_uV >= best_val) { 2314 selector = ret; 2315 if (old_selector == selector) 2316 ret = 0; 2317 else 2318 ret = rdev->desc->ops->set_voltage_sel( 2319 rdev, ret); 2320 } else { 2321 ret = -EINVAL; 2322 } 2323 } 2324 } else { 2325 ret = -EINVAL; 2326 } 2327 2328 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2329 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2330 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { 2331 2332 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2333 old_selector, selector); 2334 if (delay < 0) { 2335 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2336 delay); 2337 delay = 0; 2338 } 2339 2340 /* Insert any necessary delays */ 2341 if (delay >= 1000) { 2342 mdelay(delay / 1000); 2343 udelay(delay % 1000); 2344 } else if (delay) { 2345 udelay(delay); 2346 } 2347 } 2348 2349 if (ret == 0 && best_val >= 0) { 2350 unsigned long data = best_val; 2351 2352 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2353 (void *)data); 2354 } 2355 2356 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2357 2358 return ret; 2359} 2360 2361/** 2362 * regulator_set_voltage - set regulator output voltage 2363 * @regulator: regulator source 2364 * @min_uV: Minimum required voltage in uV 2365 * @max_uV: Maximum acceptable voltage in uV 2366 * 2367 * Sets a voltage regulator to the desired output voltage. This can be set 2368 * during any regulator state. IOW, regulator can be disabled or enabled. 2369 * 2370 * If the regulator is enabled then the voltage will change to the new value 2371 * immediately otherwise if the regulator is disabled the regulator will 2372 * output at the new voltage when enabled. 2373 * 2374 * NOTE: If the regulator is shared between several devices then the lowest 2375 * request voltage that meets the system constraints will be used. 2376 * Regulator system constraints must be set for this regulator before 2377 * calling this function otherwise this call will fail. 2378 */ 2379int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2380{ 2381 struct regulator_dev *rdev = regulator->rdev; 2382 int ret = 0; 2383 int old_min_uV, old_max_uV; 2384 2385 mutex_lock(&rdev->mutex); 2386 2387 /* If we're setting the same range as last time the change 2388 * should be a noop (some cpufreq implementations use the same 2389 * voltage for multiple frequencies, for example). 2390 */ 2391 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2392 goto out; 2393 2394 /* sanity check */ 2395 if (!rdev->desc->ops->set_voltage && 2396 !rdev->desc->ops->set_voltage_sel) { 2397 ret = -EINVAL; 2398 goto out; 2399 } 2400 2401 /* constraints check */ 2402 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2403 if (ret < 0) 2404 goto out; 2405 2406 /* restore original values in case of error */ 2407 old_min_uV = regulator->min_uV; 2408 old_max_uV = regulator->max_uV; 2409 regulator->min_uV = min_uV; 2410 regulator->max_uV = max_uV; 2411 2412 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2413 if (ret < 0) 2414 goto out2; 2415 2416 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2417 if (ret < 0) 2418 goto out2; 2419 2420out: 2421 mutex_unlock(&rdev->mutex); 2422 return ret; 2423out2: 2424 regulator->min_uV = old_min_uV; 2425 regulator->max_uV = old_max_uV; 2426 mutex_unlock(&rdev->mutex); 2427 return ret; 2428} 2429EXPORT_SYMBOL_GPL(regulator_set_voltage); 2430 2431/** 2432 * regulator_set_voltage_time - get raise/fall time 2433 * @regulator: regulator source 2434 * @old_uV: starting voltage in microvolts 2435 * @new_uV: target voltage in microvolts 2436 * 2437 * Provided with the starting and ending voltage, this function attempts to 2438 * calculate the time in microseconds required to rise or fall to this new 2439 * voltage. 2440 */ 2441int regulator_set_voltage_time(struct regulator *regulator, 2442 int old_uV, int new_uV) 2443{ 2444 struct regulator_dev *rdev = regulator->rdev; 2445 struct regulator_ops *ops = rdev->desc->ops; 2446 int old_sel = -1; 2447 int new_sel = -1; 2448 int voltage; 2449 int i; 2450 2451 /* Currently requires operations to do this */ 2452 if (!ops->list_voltage || !ops->set_voltage_time_sel 2453 || !rdev->desc->n_voltages) 2454 return -EINVAL; 2455 2456 for (i = 0; i < rdev->desc->n_voltages; i++) { 2457 /* We only look for exact voltage matches here */ 2458 voltage = regulator_list_voltage(regulator, i); 2459 if (voltage < 0) 2460 return -EINVAL; 2461 if (voltage == 0) 2462 continue; 2463 if (voltage == old_uV) 2464 old_sel = i; 2465 if (voltage == new_uV) 2466 new_sel = i; 2467 } 2468 2469 if (old_sel < 0 || new_sel < 0) 2470 return -EINVAL; 2471 2472 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2473} 2474EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2475 2476/** 2477 * regulator_set_voltage_time_sel - get raise/fall time 2478 * @rdev: regulator source device 2479 * @old_selector: selector for starting voltage 2480 * @new_selector: selector for target voltage 2481 * 2482 * Provided with the starting and target voltage selectors, this function 2483 * returns time in microseconds required to rise or fall to this new voltage 2484 * 2485 * Drivers providing ramp_delay in regulation_constraints can use this as their 2486 * set_voltage_time_sel() operation. 2487 */ 2488int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2489 unsigned int old_selector, 2490 unsigned int new_selector) 2491{ 2492 unsigned int ramp_delay = 0; 2493 int old_volt, new_volt; 2494 2495 if (rdev->constraints->ramp_delay) 2496 ramp_delay = rdev->constraints->ramp_delay; 2497 else if (rdev->desc->ramp_delay) 2498 ramp_delay = rdev->desc->ramp_delay; 2499 2500 if (ramp_delay == 0) { 2501 rdev_warn(rdev, "ramp_delay not set\n"); 2502 return 0; 2503 } 2504 2505 /* sanity check */ 2506 if (!rdev->desc->ops->list_voltage) 2507 return -EINVAL; 2508 2509 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2510 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2511 2512 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2513} 2514EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2515 2516/** 2517 * regulator_sync_voltage - re-apply last regulator output voltage 2518 * @regulator: regulator source 2519 * 2520 * Re-apply the last configured voltage. This is intended to be used 2521 * where some external control source the consumer is cooperating with 2522 * has caused the configured voltage to change. 2523 */ 2524int regulator_sync_voltage(struct regulator *regulator) 2525{ 2526 struct regulator_dev *rdev = regulator->rdev; 2527 int ret, min_uV, max_uV; 2528 2529 mutex_lock(&rdev->mutex); 2530 2531 if (!rdev->desc->ops->set_voltage && 2532 !rdev->desc->ops->set_voltage_sel) { 2533 ret = -EINVAL; 2534 goto out; 2535 } 2536 2537 /* This is only going to work if we've had a voltage configured. */ 2538 if (!regulator->min_uV && !regulator->max_uV) { 2539 ret = -EINVAL; 2540 goto out; 2541 } 2542 2543 min_uV = regulator->min_uV; 2544 max_uV = regulator->max_uV; 2545 2546 /* This should be a paranoia check... */ 2547 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2548 if (ret < 0) 2549 goto out; 2550 2551 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2552 if (ret < 0) 2553 goto out; 2554 2555 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2556 2557out: 2558 mutex_unlock(&rdev->mutex); 2559 return ret; 2560} 2561EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2562 2563static int _regulator_get_voltage(struct regulator_dev *rdev) 2564{ 2565 int sel, ret; 2566 2567 if (rdev->desc->ops->get_voltage_sel) { 2568 sel = rdev->desc->ops->get_voltage_sel(rdev); 2569 if (sel < 0) 2570 return sel; 2571 ret = rdev->desc->ops->list_voltage(rdev, sel); 2572 } else if (rdev->desc->ops->get_voltage) { 2573 ret = rdev->desc->ops->get_voltage(rdev); 2574 } else if (rdev->desc->ops->list_voltage) { 2575 ret = rdev->desc->ops->list_voltage(rdev, 0); 2576 } else { 2577 return -EINVAL; 2578 } 2579 2580 if (ret < 0) 2581 return ret; 2582 return ret - rdev->constraints->uV_offset; 2583} 2584 2585/** 2586 * regulator_get_voltage - get regulator output voltage 2587 * @regulator: regulator source 2588 * 2589 * This returns the current regulator voltage in uV. 2590 * 2591 * NOTE: If the regulator is disabled it will return the voltage value. This 2592 * function should not be used to determine regulator state. 2593 */ 2594int regulator_get_voltage(struct regulator *regulator) 2595{ 2596 int ret; 2597 2598 mutex_lock(®ulator->rdev->mutex); 2599 2600 ret = _regulator_get_voltage(regulator->rdev); 2601 2602 mutex_unlock(®ulator->rdev->mutex); 2603 2604 return ret; 2605} 2606EXPORT_SYMBOL_GPL(regulator_get_voltage); 2607 2608/** 2609 * regulator_set_current_limit - set regulator output current limit 2610 * @regulator: regulator source 2611 * @min_uA: Minimuum supported current in uA 2612 * @max_uA: Maximum supported current in uA 2613 * 2614 * Sets current sink to the desired output current. This can be set during 2615 * any regulator state. IOW, regulator can be disabled or enabled. 2616 * 2617 * If the regulator is enabled then the current will change to the new value 2618 * immediately otherwise if the regulator is disabled the regulator will 2619 * output at the new current when enabled. 2620 * 2621 * NOTE: Regulator system constraints must be set for this regulator before 2622 * calling this function otherwise this call will fail. 2623 */ 2624int regulator_set_current_limit(struct regulator *regulator, 2625 int min_uA, int max_uA) 2626{ 2627 struct regulator_dev *rdev = regulator->rdev; 2628 int ret; 2629 2630 mutex_lock(&rdev->mutex); 2631 2632 /* sanity check */ 2633 if (!rdev->desc->ops->set_current_limit) { 2634 ret = -EINVAL; 2635 goto out; 2636 } 2637 2638 /* constraints check */ 2639 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2640 if (ret < 0) 2641 goto out; 2642 2643 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2644out: 2645 mutex_unlock(&rdev->mutex); 2646 return ret; 2647} 2648EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2649 2650static int _regulator_get_current_limit(struct regulator_dev *rdev) 2651{ 2652 int ret; 2653 2654 mutex_lock(&rdev->mutex); 2655 2656 /* sanity check */ 2657 if (!rdev->desc->ops->get_current_limit) { 2658 ret = -EINVAL; 2659 goto out; 2660 } 2661 2662 ret = rdev->desc->ops->get_current_limit(rdev); 2663out: 2664 mutex_unlock(&rdev->mutex); 2665 return ret; 2666} 2667 2668/** 2669 * regulator_get_current_limit - get regulator output current 2670 * @regulator: regulator source 2671 * 2672 * This returns the current supplied by the specified current sink in uA. 2673 * 2674 * NOTE: If the regulator is disabled it will return the current value. This 2675 * function should not be used to determine regulator state. 2676 */ 2677int regulator_get_current_limit(struct regulator *regulator) 2678{ 2679 return _regulator_get_current_limit(regulator->rdev); 2680} 2681EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2682 2683/** 2684 * regulator_set_mode - set regulator operating mode 2685 * @regulator: regulator source 2686 * @mode: operating mode - one of the REGULATOR_MODE constants 2687 * 2688 * Set regulator operating mode to increase regulator efficiency or improve 2689 * regulation performance. 2690 * 2691 * NOTE: Regulator system constraints must be set for this regulator before 2692 * calling this function otherwise this call will fail. 2693 */ 2694int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2695{ 2696 struct regulator_dev *rdev = regulator->rdev; 2697 int ret; 2698 int regulator_curr_mode; 2699 2700 mutex_lock(&rdev->mutex); 2701 2702 /* sanity check */ 2703 if (!rdev->desc->ops->set_mode) { 2704 ret = -EINVAL; 2705 goto out; 2706 } 2707 2708 /* return if the same mode is requested */ 2709 if (rdev->desc->ops->get_mode) { 2710 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2711 if (regulator_curr_mode == mode) { 2712 ret = 0; 2713 goto out; 2714 } 2715 } 2716 2717 /* constraints check */ 2718 ret = regulator_mode_constrain(rdev, &mode); 2719 if (ret < 0) 2720 goto out; 2721 2722 ret = rdev->desc->ops->set_mode(rdev, mode); 2723out: 2724 mutex_unlock(&rdev->mutex); 2725 return ret; 2726} 2727EXPORT_SYMBOL_GPL(regulator_set_mode); 2728 2729static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2730{ 2731 int ret; 2732 2733 mutex_lock(&rdev->mutex); 2734 2735 /* sanity check */ 2736 if (!rdev->desc->ops->get_mode) { 2737 ret = -EINVAL; 2738 goto out; 2739 } 2740 2741 ret = rdev->desc->ops->get_mode(rdev); 2742out: 2743 mutex_unlock(&rdev->mutex); 2744 return ret; 2745} 2746 2747/** 2748 * regulator_get_mode - get regulator operating mode 2749 * @regulator: regulator source 2750 * 2751 * Get the current regulator operating mode. 2752 */ 2753unsigned int regulator_get_mode(struct regulator *regulator) 2754{ 2755 return _regulator_get_mode(regulator->rdev); 2756} 2757EXPORT_SYMBOL_GPL(regulator_get_mode); 2758 2759/** 2760 * regulator_set_optimum_mode - set regulator optimum operating mode 2761 * @regulator: regulator source 2762 * @uA_load: load current 2763 * 2764 * Notifies the regulator core of a new device load. This is then used by 2765 * DRMS (if enabled by constraints) to set the most efficient regulator 2766 * operating mode for the new regulator loading. 2767 * 2768 * Consumer devices notify their supply regulator of the maximum power 2769 * they will require (can be taken from device datasheet in the power 2770 * consumption tables) when they change operational status and hence power 2771 * state. Examples of operational state changes that can affect power 2772 * consumption are :- 2773 * 2774 * o Device is opened / closed. 2775 * o Device I/O is about to begin or has just finished. 2776 * o Device is idling in between work. 2777 * 2778 * This information is also exported via sysfs to userspace. 2779 * 2780 * DRMS will sum the total requested load on the regulator and change 2781 * to the most efficient operating mode if platform constraints allow. 2782 * 2783 * Returns the new regulator mode or error. 2784 */ 2785int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2786{ 2787 struct regulator_dev *rdev = regulator->rdev; 2788 struct regulator *consumer; 2789 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2790 unsigned int mode; 2791 2792 if (rdev->supply) 2793 input_uV = regulator_get_voltage(rdev->supply); 2794 2795 mutex_lock(&rdev->mutex); 2796 2797 /* 2798 * first check to see if we can set modes at all, otherwise just 2799 * tell the consumer everything is OK. 2800 */ 2801 regulator->uA_load = uA_load; 2802 ret = regulator_check_drms(rdev); 2803 if (ret < 0) { 2804 ret = 0; 2805 goto out; 2806 } 2807 2808 if (!rdev->desc->ops->get_optimum_mode) 2809 goto out; 2810 2811 /* 2812 * we can actually do this so any errors are indicators of 2813 * potential real failure. 2814 */ 2815 ret = -EINVAL; 2816 2817 if (!rdev->desc->ops->set_mode) 2818 goto out; 2819 2820 /* get output voltage */ 2821 output_uV = _regulator_get_voltage(rdev); 2822 if (output_uV <= 0) { 2823 rdev_err(rdev, "invalid output voltage found\n"); 2824 goto out; 2825 } 2826 2827 /* No supply? Use constraint voltage */ 2828 if (input_uV <= 0) 2829 input_uV = rdev->constraints->input_uV; 2830 if (input_uV <= 0) { 2831 rdev_err(rdev, "invalid input voltage found\n"); 2832 goto out; 2833 } 2834 2835 /* calc total requested load for this regulator */ 2836 list_for_each_entry(consumer, &rdev->consumer_list, list) 2837 total_uA_load += consumer->uA_load; 2838 2839 mode = rdev->desc->ops->get_optimum_mode(rdev, 2840 input_uV, output_uV, 2841 total_uA_load); 2842 ret = regulator_mode_constrain(rdev, &mode); 2843 if (ret < 0) { 2844 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2845 total_uA_load, input_uV, output_uV); 2846 goto out; 2847 } 2848 2849 ret = rdev->desc->ops->set_mode(rdev, mode); 2850 if (ret < 0) { 2851 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2852 goto out; 2853 } 2854 ret = mode; 2855out: 2856 mutex_unlock(&rdev->mutex); 2857 return ret; 2858} 2859EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2860 2861/** 2862 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2863 * 2864 * @rdev: device to operate on. 2865 * @enable: state to set. 2866 */ 2867int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2868{ 2869 unsigned int val; 2870 2871 if (enable) 2872 val = rdev->desc->bypass_mask; 2873 else 2874 val = 0; 2875 2876 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2877 rdev->desc->bypass_mask, val); 2878} 2879EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2880 2881/** 2882 * regulator_get_bypass_regmap - Default get_bypass() using regmap 2883 * 2884 * @rdev: device to operate on. 2885 * @enable: current state. 2886 */ 2887int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 2888{ 2889 unsigned int val; 2890 int ret; 2891 2892 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 2893 if (ret != 0) 2894 return ret; 2895 2896 *enable = val & rdev->desc->bypass_mask; 2897 2898 return 0; 2899} 2900EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 2901 2902/** 2903 * regulator_allow_bypass - allow the regulator to go into bypass mode 2904 * 2905 * @regulator: Regulator to configure 2906 * @allow: enable or disable bypass mode 2907 * 2908 * Allow the regulator to go into bypass mode if all other consumers 2909 * for the regulator also enable bypass mode and the machine 2910 * constraints allow this. Bypass mode means that the regulator is 2911 * simply passing the input directly to the output with no regulation. 2912 */ 2913int regulator_allow_bypass(struct regulator *regulator, bool enable) 2914{ 2915 struct regulator_dev *rdev = regulator->rdev; 2916 int ret = 0; 2917 2918 if (!rdev->desc->ops->set_bypass) 2919 return 0; 2920 2921 if (rdev->constraints && 2922 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2923 return 0; 2924 2925 mutex_lock(&rdev->mutex); 2926 2927 if (enable && !regulator->bypass) { 2928 rdev->bypass_count++; 2929 2930 if (rdev->bypass_count == rdev->open_count) { 2931 ret = rdev->desc->ops->set_bypass(rdev, enable); 2932 if (ret != 0) 2933 rdev->bypass_count--; 2934 } 2935 2936 } else if (!enable && regulator->bypass) { 2937 rdev->bypass_count--; 2938 2939 if (rdev->bypass_count != rdev->open_count) { 2940 ret = rdev->desc->ops->set_bypass(rdev, enable); 2941 if (ret != 0) 2942 rdev->bypass_count++; 2943 } 2944 } 2945 2946 if (ret == 0) 2947 regulator->bypass = enable; 2948 2949 mutex_unlock(&rdev->mutex); 2950 2951 return ret; 2952} 2953EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2954 2955/** 2956 * regulator_register_notifier - register regulator event notifier 2957 * @regulator: regulator source 2958 * @nb: notifier block 2959 * 2960 * Register notifier block to receive regulator events. 2961 */ 2962int regulator_register_notifier(struct regulator *regulator, 2963 struct notifier_block *nb) 2964{ 2965 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2966 nb); 2967} 2968EXPORT_SYMBOL_GPL(regulator_register_notifier); 2969 2970/** 2971 * regulator_unregister_notifier - unregister regulator event notifier 2972 * @regulator: regulator source 2973 * @nb: notifier block 2974 * 2975 * Unregister regulator event notifier block. 2976 */ 2977int regulator_unregister_notifier(struct regulator *regulator, 2978 struct notifier_block *nb) 2979{ 2980 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2981 nb); 2982} 2983EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2984 2985/* notify regulator consumers and downstream regulator consumers. 2986 * Note mutex must be held by caller. 2987 */ 2988static void _notifier_call_chain(struct regulator_dev *rdev, 2989 unsigned long event, void *data) 2990{ 2991 /* call rdev chain first */ 2992 blocking_notifier_call_chain(&rdev->notifier, event, data); 2993} 2994 2995/** 2996 * regulator_bulk_get - get multiple regulator consumers 2997 * 2998 * @dev: Device to supply 2999 * @num_consumers: Number of consumers to register 3000 * @consumers: Configuration of consumers; clients are stored here. 3001 * 3002 * @return 0 on success, an errno on failure. 3003 * 3004 * This helper function allows drivers to get several regulator 3005 * consumers in one operation. If any of the regulators cannot be 3006 * acquired then any regulators that were allocated will be freed 3007 * before returning to the caller. 3008 */ 3009int regulator_bulk_get(struct device *dev, int num_consumers, 3010 struct regulator_bulk_data *consumers) 3011{ 3012 int i; 3013 int ret; 3014 3015 for (i = 0; i < num_consumers; i++) 3016 consumers[i].consumer = NULL; 3017 3018 for (i = 0; i < num_consumers; i++) { 3019 consumers[i].consumer = regulator_get(dev, 3020 consumers[i].supply); 3021 if (IS_ERR(consumers[i].consumer)) { 3022 ret = PTR_ERR(consumers[i].consumer); 3023 dev_err(dev, "Failed to get supply '%s': %d\n", 3024 consumers[i].supply, ret); 3025 consumers[i].consumer = NULL; 3026 goto err; 3027 } 3028 } 3029 3030 return 0; 3031 3032err: 3033 while (--i >= 0) 3034 regulator_put(consumers[i].consumer); 3035 3036 return ret; 3037} 3038EXPORT_SYMBOL_GPL(regulator_bulk_get); 3039 3040/** 3041 * devm_regulator_bulk_get - managed get multiple regulator consumers 3042 * 3043 * @dev: Device to supply 3044 * @num_consumers: Number of consumers to register 3045 * @consumers: Configuration of consumers; clients are stored here. 3046 * 3047 * @return 0 on success, an errno on failure. 3048 * 3049 * This helper function allows drivers to get several regulator 3050 * consumers in one operation with management, the regulators will 3051 * automatically be freed when the device is unbound. If any of the 3052 * regulators cannot be acquired then any regulators that were 3053 * allocated will be freed before returning to the caller. 3054 */ 3055int devm_regulator_bulk_get(struct device *dev, int num_consumers, 3056 struct regulator_bulk_data *consumers) 3057{ 3058 int i; 3059 int ret; 3060 3061 for (i = 0; i < num_consumers; i++) 3062 consumers[i].consumer = NULL; 3063 3064 for (i = 0; i < num_consumers; i++) { 3065 consumers[i].consumer = devm_regulator_get(dev, 3066 consumers[i].supply); 3067 if (IS_ERR(consumers[i].consumer)) { 3068 ret = PTR_ERR(consumers[i].consumer); 3069 dev_err(dev, "Failed to get supply '%s': %d\n", 3070 consumers[i].supply, ret); 3071 consumers[i].consumer = NULL; 3072 goto err; 3073 } 3074 } 3075 3076 return 0; 3077 3078err: 3079 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 3080 devm_regulator_put(consumers[i].consumer); 3081 3082 return ret; 3083} 3084EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 3085 3086static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3087{ 3088 struct regulator_bulk_data *bulk = data; 3089 3090 bulk->ret = regulator_enable(bulk->consumer); 3091} 3092 3093/** 3094 * regulator_bulk_enable - enable multiple regulator consumers 3095 * 3096 * @num_consumers: Number of consumers 3097 * @consumers: Consumer data; clients are stored here. 3098 * @return 0 on success, an errno on failure 3099 * 3100 * This convenience API allows consumers to enable multiple regulator 3101 * clients in a single API call. If any consumers cannot be enabled 3102 * then any others that were enabled will be disabled again prior to 3103 * return. 3104 */ 3105int regulator_bulk_enable(int num_consumers, 3106 struct regulator_bulk_data *consumers) 3107{ 3108 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3109 int i; 3110 int ret = 0; 3111 3112 for (i = 0; i < num_consumers; i++) { 3113 if (consumers[i].consumer->always_on) 3114 consumers[i].ret = 0; 3115 else 3116 async_schedule_domain(regulator_bulk_enable_async, 3117 &consumers[i], &async_domain); 3118 } 3119 3120 async_synchronize_full_domain(&async_domain); 3121 3122 /* If any consumer failed we need to unwind any that succeeded */ 3123 for (i = 0; i < num_consumers; i++) { 3124 if (consumers[i].ret != 0) { 3125 ret = consumers[i].ret; 3126 goto err; 3127 } 3128 } 3129 3130 return 0; 3131 3132err: 3133 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 3134 while (--i >= 0) 3135 regulator_disable(consumers[i].consumer); 3136 3137 return ret; 3138} 3139EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3140 3141/** 3142 * regulator_bulk_disable - disable multiple regulator consumers 3143 * 3144 * @num_consumers: Number of consumers 3145 * @consumers: Consumer data; clients are stored here. 3146 * @return 0 on success, an errno on failure 3147 * 3148 * This convenience API allows consumers to disable multiple regulator 3149 * clients in a single API call. If any consumers cannot be disabled 3150 * then any others that were disabled will be enabled again prior to 3151 * return. 3152 */ 3153int regulator_bulk_disable(int num_consumers, 3154 struct regulator_bulk_data *consumers) 3155{ 3156 int i; 3157 int ret, r; 3158 3159 for (i = num_consumers - 1; i >= 0; --i) { 3160 ret = regulator_disable(consumers[i].consumer); 3161 if (ret != 0) 3162 goto err; 3163 } 3164 3165 return 0; 3166 3167err: 3168 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3169 for (++i; i < num_consumers; ++i) { 3170 r = regulator_enable(consumers[i].consumer); 3171 if (r != 0) 3172 pr_err("Failed to reename %s: %d\n", 3173 consumers[i].supply, r); 3174 } 3175 3176 return ret; 3177} 3178EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3179 3180/** 3181 * regulator_bulk_force_disable - force disable multiple regulator consumers 3182 * 3183 * @num_consumers: Number of consumers 3184 * @consumers: Consumer data; clients are stored here. 3185 * @return 0 on success, an errno on failure 3186 * 3187 * This convenience API allows consumers to forcibly disable multiple regulator 3188 * clients in a single API call. 3189 * NOTE: This should be used for situations when device damage will 3190 * likely occur if the regulators are not disabled (e.g. over temp). 3191 * Although regulator_force_disable function call for some consumers can 3192 * return error numbers, the function is called for all consumers. 3193 */ 3194int regulator_bulk_force_disable(int num_consumers, 3195 struct regulator_bulk_data *consumers) 3196{ 3197 int i; 3198 int ret; 3199 3200 for (i = 0; i < num_consumers; i++) 3201 consumers[i].ret = 3202 regulator_force_disable(consumers[i].consumer); 3203 3204 for (i = 0; i < num_consumers; i++) { 3205 if (consumers[i].ret != 0) { 3206 ret = consumers[i].ret; 3207 goto out; 3208 } 3209 } 3210 3211 return 0; 3212out: 3213 return ret; 3214} 3215EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3216 3217/** 3218 * regulator_bulk_free - free multiple regulator consumers 3219 * 3220 * @num_consumers: Number of consumers 3221 * @consumers: Consumer data; clients are stored here. 3222 * 3223 * This convenience API allows consumers to free multiple regulator 3224 * clients in a single API call. 3225 */ 3226void regulator_bulk_free(int num_consumers, 3227 struct regulator_bulk_data *consumers) 3228{ 3229 int i; 3230 3231 for (i = 0; i < num_consumers; i++) { 3232 regulator_put(consumers[i].consumer); 3233 consumers[i].consumer = NULL; 3234 } 3235} 3236EXPORT_SYMBOL_GPL(regulator_bulk_free); 3237 3238/** 3239 * regulator_notifier_call_chain - call regulator event notifier 3240 * @rdev: regulator source 3241 * @event: notifier block 3242 * @data: callback-specific data. 3243 * 3244 * Called by regulator drivers to notify clients a regulator event has 3245 * occurred. We also notify regulator clients downstream. 3246 * Note lock must be held by caller. 3247 */ 3248int regulator_notifier_call_chain(struct regulator_dev *rdev, 3249 unsigned long event, void *data) 3250{ 3251 _notifier_call_chain(rdev, event, data); 3252 return NOTIFY_DONE; 3253 3254} 3255EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3256 3257/** 3258 * regulator_mode_to_status - convert a regulator mode into a status 3259 * 3260 * @mode: Mode to convert 3261 * 3262 * Convert a regulator mode into a status. 3263 */ 3264int regulator_mode_to_status(unsigned int mode) 3265{ 3266 switch (mode) { 3267 case REGULATOR_MODE_FAST: 3268 return REGULATOR_STATUS_FAST; 3269 case REGULATOR_MODE_NORMAL: 3270 return REGULATOR_STATUS_NORMAL; 3271 case REGULATOR_MODE_IDLE: 3272 return REGULATOR_STATUS_IDLE; 3273 case REGULATOR_MODE_STANDBY: 3274 return REGULATOR_STATUS_STANDBY; 3275 default: 3276 return REGULATOR_STATUS_UNDEFINED; 3277 } 3278} 3279EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3280 3281/* 3282 * To avoid cluttering sysfs (and memory) with useless state, only 3283 * create attributes that can be meaningfully displayed. 3284 */ 3285static int add_regulator_attributes(struct regulator_dev *rdev) 3286{ 3287 struct device *dev = &rdev->dev; 3288 struct regulator_ops *ops = rdev->desc->ops; 3289 int status = 0; 3290 3291 /* some attributes need specific methods to be displayed */ 3292 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3293 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3294 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3295 status = device_create_file(dev, &dev_attr_microvolts); 3296 if (status < 0) 3297 return status; 3298 } 3299 if (ops->get_current_limit) { 3300 status = device_create_file(dev, &dev_attr_microamps); 3301 if (status < 0) 3302 return status; 3303 } 3304 if (ops->get_mode) { 3305 status = device_create_file(dev, &dev_attr_opmode); 3306 if (status < 0) 3307 return status; 3308 } 3309 if (rdev->ena_gpio || ops->is_enabled) { 3310 status = device_create_file(dev, &dev_attr_state); 3311 if (status < 0) 3312 return status; 3313 } 3314 if (ops->get_status) { 3315 status = device_create_file(dev, &dev_attr_status); 3316 if (status < 0) 3317 return status; 3318 } 3319 if (ops->get_bypass) { 3320 status = device_create_file(dev, &dev_attr_bypass); 3321 if (status < 0) 3322 return status; 3323 } 3324 3325 /* some attributes are type-specific */ 3326 if (rdev->desc->type == REGULATOR_CURRENT) { 3327 status = device_create_file(dev, &dev_attr_requested_microamps); 3328 if (status < 0) 3329 return status; 3330 } 3331 3332 /* all the other attributes exist to support constraints; 3333 * don't show them if there are no constraints, or if the 3334 * relevant supporting methods are missing. 3335 */ 3336 if (!rdev->constraints) 3337 return status; 3338 3339 /* constraints need specific supporting methods */ 3340 if (ops->set_voltage || ops->set_voltage_sel) { 3341 status = device_create_file(dev, &dev_attr_min_microvolts); 3342 if (status < 0) 3343 return status; 3344 status = device_create_file(dev, &dev_attr_max_microvolts); 3345 if (status < 0) 3346 return status; 3347 } 3348 if (ops->set_current_limit) { 3349 status = device_create_file(dev, &dev_attr_min_microamps); 3350 if (status < 0) 3351 return status; 3352 status = device_create_file(dev, &dev_attr_max_microamps); 3353 if (status < 0) 3354 return status; 3355 } 3356 3357 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3358 if (status < 0) 3359 return status; 3360 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3361 if (status < 0) 3362 return status; 3363 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3364 if (status < 0) 3365 return status; 3366 3367 if (ops->set_suspend_voltage) { 3368 status = device_create_file(dev, 3369 &dev_attr_suspend_standby_microvolts); 3370 if (status < 0) 3371 return status; 3372 status = device_create_file(dev, 3373 &dev_attr_suspend_mem_microvolts); 3374 if (status < 0) 3375 return status; 3376 status = device_create_file(dev, 3377 &dev_attr_suspend_disk_microvolts); 3378 if (status < 0) 3379 return status; 3380 } 3381 3382 if (ops->set_suspend_mode) { 3383 status = device_create_file(dev, 3384 &dev_attr_suspend_standby_mode); 3385 if (status < 0) 3386 return status; 3387 status = device_create_file(dev, 3388 &dev_attr_suspend_mem_mode); 3389 if (status < 0) 3390 return status; 3391 status = device_create_file(dev, 3392 &dev_attr_suspend_disk_mode); 3393 if (status < 0) 3394 return status; 3395 } 3396 3397 return status; 3398} 3399 3400static void rdev_init_debugfs(struct regulator_dev *rdev) 3401{ 3402 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3403 if (!rdev->debugfs) { 3404 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3405 return; 3406 } 3407 3408 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3409 &rdev->use_count); 3410 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3411 &rdev->open_count); 3412 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3413 &rdev->bypass_count); 3414} 3415 3416/** 3417 * regulator_register - register regulator 3418 * @regulator_desc: regulator to register 3419 * @config: runtime configuration for regulator 3420 * 3421 * Called by regulator drivers to register a regulator. 3422 * Returns a valid pointer to struct regulator_dev on success 3423 * or an ERR_PTR() on error. 3424 */ 3425struct regulator_dev * 3426regulator_register(const struct regulator_desc *regulator_desc, 3427 const struct regulator_config *config) 3428{ 3429 const struct regulation_constraints *constraints = NULL; 3430 const struct regulator_init_data *init_data; 3431 static atomic_t regulator_no = ATOMIC_INIT(0); 3432 struct regulator_dev *rdev; 3433 struct device *dev; 3434 int ret, i; 3435 const char *supply = NULL; 3436 3437 if (regulator_desc == NULL || config == NULL) 3438 return ERR_PTR(-EINVAL); 3439 3440 dev = config->dev; 3441 WARN_ON(!dev); 3442 3443 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3444 return ERR_PTR(-EINVAL); 3445 3446 if (regulator_desc->type != REGULATOR_VOLTAGE && 3447 regulator_desc->type != REGULATOR_CURRENT) 3448 return ERR_PTR(-EINVAL); 3449 3450 /* Only one of each should be implemented */ 3451 WARN_ON(regulator_desc->ops->get_voltage && 3452 regulator_desc->ops->get_voltage_sel); 3453 WARN_ON(regulator_desc->ops->set_voltage && 3454 regulator_desc->ops->set_voltage_sel); 3455 3456 /* If we're using selectors we must implement list_voltage. */ 3457 if (regulator_desc->ops->get_voltage_sel && 3458 !regulator_desc->ops->list_voltage) { 3459 return ERR_PTR(-EINVAL); 3460 } 3461 if (regulator_desc->ops->set_voltage_sel && 3462 !regulator_desc->ops->list_voltage) { 3463 return ERR_PTR(-EINVAL); 3464 } 3465 3466 init_data = config->init_data; 3467 3468 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3469 if (rdev == NULL) 3470 return ERR_PTR(-ENOMEM); 3471 3472 mutex_lock(®ulator_list_mutex); 3473 3474 mutex_init(&rdev->mutex); 3475 rdev->reg_data = config->driver_data; 3476 rdev->owner = regulator_desc->owner; 3477 rdev->desc = regulator_desc; 3478 if (config->regmap) 3479 rdev->regmap = config->regmap; 3480 else if (dev_get_regmap(dev, NULL)) 3481 rdev->regmap = dev_get_regmap(dev, NULL); 3482 else if (dev->parent) 3483 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3484 INIT_LIST_HEAD(&rdev->consumer_list); 3485 INIT_LIST_HEAD(&rdev->list); 3486 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3487 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3488 3489 /* preform any regulator specific init */ 3490 if (init_data && init_data->regulator_init) { 3491 ret = init_data->regulator_init(rdev->reg_data); 3492 if (ret < 0) 3493 goto clean; 3494 } 3495 3496 /* register with sysfs */ 3497 rdev->dev.class = ®ulator_class; 3498 rdev->dev.of_node = config->of_node; 3499 rdev->dev.parent = dev; 3500 dev_set_name(&rdev->dev, "regulator.%d", 3501 atomic_inc_return(®ulator_no) - 1); 3502 ret = device_register(&rdev->dev); 3503 if (ret != 0) { 3504 put_device(&rdev->dev); 3505 goto clean; 3506 } 3507 3508 dev_set_drvdata(&rdev->dev, rdev); 3509 3510 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3511 ret = regulator_ena_gpio_request(rdev, config); 3512 if (ret != 0) { 3513 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3514 config->ena_gpio, ret); 3515 goto wash; 3516 } 3517 3518 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3519 rdev->ena_gpio_state = 1; 3520 3521 if (rdev->ena_gpio_invert) 3522 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3523 } 3524 3525 /* set regulator constraints */ 3526 if (init_data) 3527 constraints = &init_data->constraints; 3528 3529 ret = set_machine_constraints(rdev, constraints); 3530 if (ret < 0) 3531 goto scrub; 3532 3533 /* add attributes supported by this regulator */ 3534 ret = add_regulator_attributes(rdev); 3535 if (ret < 0) 3536 goto scrub; 3537 3538 if (init_data && init_data->supply_regulator) 3539 supply = init_data->supply_regulator; 3540 else if (regulator_desc->supply_name) 3541 supply = regulator_desc->supply_name; 3542 3543 if (supply) { 3544 struct regulator_dev *r; 3545 3546 r = regulator_dev_lookup(dev, supply, &ret); 3547 3548 if (!r) { 3549 dev_err(dev, "Failed to find supply %s\n", supply); 3550 ret = -EPROBE_DEFER; 3551 goto scrub; 3552 } 3553 3554 ret = set_supply(rdev, r); 3555 if (ret < 0) 3556 goto scrub; 3557 3558 /* Enable supply if rail is enabled */ 3559 if (_regulator_is_enabled(rdev)) { 3560 ret = regulator_enable(rdev->supply); 3561 if (ret < 0) 3562 goto scrub; 3563 } 3564 } 3565 3566 /* add consumers devices */ 3567 if (init_data) { 3568 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3569 ret = set_consumer_device_supply(rdev, 3570 init_data->consumer_supplies[i].dev_name, 3571 init_data->consumer_supplies[i].supply); 3572 if (ret < 0) { 3573 dev_err(dev, "Failed to set supply %s\n", 3574 init_data->consumer_supplies[i].supply); 3575 goto unset_supplies; 3576 } 3577 } 3578 } 3579 3580 list_add(&rdev->list, ®ulator_list); 3581 3582 rdev_init_debugfs(rdev); 3583out: 3584 mutex_unlock(®ulator_list_mutex); 3585 return rdev; 3586 3587unset_supplies: 3588 unset_regulator_supplies(rdev); 3589 3590scrub: 3591 if (rdev->supply) 3592 _regulator_put(rdev->supply); 3593 regulator_ena_gpio_free(rdev); 3594 kfree(rdev->constraints); 3595wash: 3596 device_unregister(&rdev->dev); 3597 /* device core frees rdev */ 3598 rdev = ERR_PTR(ret); 3599 goto out; 3600 3601clean: 3602 kfree(rdev); 3603 rdev = ERR_PTR(ret); 3604 goto out; 3605} 3606EXPORT_SYMBOL_GPL(regulator_register); 3607 3608/** 3609 * regulator_unregister - unregister regulator 3610 * @rdev: regulator to unregister 3611 * 3612 * Called by regulator drivers to unregister a regulator. 3613 */ 3614void regulator_unregister(struct regulator_dev *rdev) 3615{ 3616 if (rdev == NULL) 3617 return; 3618 3619 if (rdev->supply) 3620 regulator_put(rdev->supply); 3621 mutex_lock(®ulator_list_mutex); 3622 debugfs_remove_recursive(rdev->debugfs); 3623 flush_work(&rdev->disable_work.work); 3624 WARN_ON(rdev->open_count); 3625 unset_regulator_supplies(rdev); 3626 list_del(&rdev->list); 3627 kfree(rdev->constraints); 3628 regulator_ena_gpio_free(rdev); 3629 device_unregister(&rdev->dev); 3630 mutex_unlock(®ulator_list_mutex); 3631} 3632EXPORT_SYMBOL_GPL(regulator_unregister); 3633 3634/** 3635 * regulator_suspend_prepare - prepare regulators for system wide suspend 3636 * @state: system suspend state 3637 * 3638 * Configure each regulator with it's suspend operating parameters for state. 3639 * This will usually be called by machine suspend code prior to supending. 3640 */ 3641int regulator_suspend_prepare(suspend_state_t state) 3642{ 3643 struct regulator_dev *rdev; 3644 int ret = 0; 3645 3646 /* ON is handled by regulator active state */ 3647 if (state == PM_SUSPEND_ON) 3648 return -EINVAL; 3649 3650 mutex_lock(®ulator_list_mutex); 3651 list_for_each_entry(rdev, ®ulator_list, list) { 3652 3653 mutex_lock(&rdev->mutex); 3654 ret = suspend_prepare(rdev, state); 3655 mutex_unlock(&rdev->mutex); 3656 3657 if (ret < 0) { 3658 rdev_err(rdev, "failed to prepare\n"); 3659 goto out; 3660 } 3661 } 3662out: 3663 mutex_unlock(®ulator_list_mutex); 3664 return ret; 3665} 3666EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3667 3668/** 3669 * regulator_suspend_finish - resume regulators from system wide suspend 3670 * 3671 * Turn on regulators that might be turned off by regulator_suspend_prepare 3672 * and that should be turned on according to the regulators properties. 3673 */ 3674int regulator_suspend_finish(void) 3675{ 3676 struct regulator_dev *rdev; 3677 int ret = 0, error; 3678 3679 mutex_lock(®ulator_list_mutex); 3680 list_for_each_entry(rdev, ®ulator_list, list) { 3681 struct regulator_ops *ops = rdev->desc->ops; 3682 3683 mutex_lock(&rdev->mutex); 3684 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3685 ops->enable) { 3686 error = ops->enable(rdev); 3687 if (error) 3688 ret = error; 3689 } else { 3690 if (!has_full_constraints) 3691 goto unlock; 3692 if (!ops->disable) 3693 goto unlock; 3694 if (!_regulator_is_enabled(rdev)) 3695 goto unlock; 3696 3697 error = ops->disable(rdev); 3698 if (error) 3699 ret = error; 3700 } 3701unlock: 3702 mutex_unlock(&rdev->mutex); 3703 } 3704 mutex_unlock(®ulator_list_mutex); 3705 return ret; 3706} 3707EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3708 3709/** 3710 * regulator_has_full_constraints - the system has fully specified constraints 3711 * 3712 * Calling this function will cause the regulator API to disable all 3713 * regulators which have a zero use count and don't have an always_on 3714 * constraint in a late_initcall. 3715 * 3716 * The intention is that this will become the default behaviour in a 3717 * future kernel release so users are encouraged to use this facility 3718 * now. 3719 */ 3720void regulator_has_full_constraints(void) 3721{ 3722 has_full_constraints = 1; 3723} 3724EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3725 3726/** 3727 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3728 * 3729 * Calling this function will cause the regulator API to provide a 3730 * dummy regulator to consumers if no physical regulator is found, 3731 * allowing most consumers to proceed as though a regulator were 3732 * configured. This allows systems such as those with software 3733 * controllable regulators for the CPU core only to be brought up more 3734 * readily. 3735 */ 3736void regulator_use_dummy_regulator(void) 3737{ 3738 board_wants_dummy_regulator = true; 3739} 3740EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3741 3742/** 3743 * rdev_get_drvdata - get rdev regulator driver data 3744 * @rdev: regulator 3745 * 3746 * Get rdev regulator driver private data. This call can be used in the 3747 * regulator driver context. 3748 */ 3749void *rdev_get_drvdata(struct regulator_dev *rdev) 3750{ 3751 return rdev->reg_data; 3752} 3753EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3754 3755/** 3756 * regulator_get_drvdata - get regulator driver data 3757 * @regulator: regulator 3758 * 3759 * Get regulator driver private data. This call can be used in the consumer 3760 * driver context when non API regulator specific functions need to be called. 3761 */ 3762void *regulator_get_drvdata(struct regulator *regulator) 3763{ 3764 return regulator->rdev->reg_data; 3765} 3766EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3767 3768/** 3769 * regulator_set_drvdata - set regulator driver data 3770 * @regulator: regulator 3771 * @data: data 3772 */ 3773void regulator_set_drvdata(struct regulator *regulator, void *data) 3774{ 3775 regulator->rdev->reg_data = data; 3776} 3777EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3778 3779/** 3780 * regulator_get_id - get regulator ID 3781 * @rdev: regulator 3782 */ 3783int rdev_get_id(struct regulator_dev *rdev) 3784{ 3785 return rdev->desc->id; 3786} 3787EXPORT_SYMBOL_GPL(rdev_get_id); 3788 3789struct device *rdev_get_dev(struct regulator_dev *rdev) 3790{ 3791 return &rdev->dev; 3792} 3793EXPORT_SYMBOL_GPL(rdev_get_dev); 3794 3795void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3796{ 3797 return reg_init_data->driver_data; 3798} 3799EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3800 3801#ifdef CONFIG_DEBUG_FS 3802static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3803 size_t count, loff_t *ppos) 3804{ 3805 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3806 ssize_t len, ret = 0; 3807 struct regulator_map *map; 3808 3809 if (!buf) 3810 return -ENOMEM; 3811 3812 list_for_each_entry(map, ®ulator_map_list, list) { 3813 len = snprintf(buf + ret, PAGE_SIZE - ret, 3814 "%s -> %s.%s\n", 3815 rdev_get_name(map->regulator), map->dev_name, 3816 map->supply); 3817 if (len >= 0) 3818 ret += len; 3819 if (ret > PAGE_SIZE) { 3820 ret = PAGE_SIZE; 3821 break; 3822 } 3823 } 3824 3825 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3826 3827 kfree(buf); 3828 3829 return ret; 3830} 3831#endif 3832 3833static const struct file_operations supply_map_fops = { 3834#ifdef CONFIG_DEBUG_FS 3835 .read = supply_map_read_file, 3836 .llseek = default_llseek, 3837#endif 3838}; 3839 3840static int __init regulator_init(void) 3841{ 3842 int ret; 3843 3844 ret = class_register(®ulator_class); 3845 3846 debugfs_root = debugfs_create_dir("regulator", NULL); 3847 if (!debugfs_root) 3848 pr_warn("regulator: Failed to create debugfs directory\n"); 3849 3850 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3851 &supply_map_fops); 3852 3853 regulator_dummy_init(); 3854 3855 return ret; 3856} 3857 3858/* init early to allow our consumers to complete system booting */ 3859core_initcall(regulator_init); 3860 3861static int __init regulator_init_complete(void) 3862{ 3863 struct regulator_dev *rdev; 3864 struct regulator_ops *ops; 3865 struct regulation_constraints *c; 3866 int enabled, ret; 3867 3868 /* 3869 * Since DT doesn't provide an idiomatic mechanism for 3870 * enabling full constraints and since it's much more natural 3871 * with DT to provide them just assume that a DT enabled 3872 * system has full constraints. 3873 */ 3874 if (of_have_populated_dt()) 3875 has_full_constraints = true; 3876 3877 mutex_lock(®ulator_list_mutex); 3878 3879 /* If we have a full configuration then disable any regulators 3880 * which are not in use or always_on. This will become the 3881 * default behaviour in the future. 3882 */ 3883 list_for_each_entry(rdev, ®ulator_list, list) { 3884 ops = rdev->desc->ops; 3885 c = rdev->constraints; 3886 3887 if (!ops->disable || (c && c->always_on)) 3888 continue; 3889 3890 mutex_lock(&rdev->mutex); 3891 3892 if (rdev->use_count) 3893 goto unlock; 3894 3895 /* If we can't read the status assume it's on. */ 3896 if (ops->is_enabled) 3897 enabled = ops->is_enabled(rdev); 3898 else 3899 enabled = 1; 3900 3901 if (!enabled) 3902 goto unlock; 3903 3904 if (has_full_constraints) { 3905 /* We log since this may kill the system if it 3906 * goes wrong. */ 3907 rdev_info(rdev, "disabling\n"); 3908 ret = ops->disable(rdev); 3909 if (ret != 0) { 3910 rdev_err(rdev, "couldn't disable: %d\n", ret); 3911 } 3912 } else { 3913 /* The intention is that in future we will 3914 * assume that full constraints are provided 3915 * so warn even if we aren't going to do 3916 * anything here. 3917 */ 3918 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3919 } 3920 3921unlock: 3922 mutex_unlock(&rdev->mutex); 3923 } 3924 3925 mutex_unlock(®ulator_list_mutex); 3926 3927 return 0; 3928} 3929late_initcall(regulator_init_complete); 3930