core.c revision 2a668a8bc2cbe7a464ab1212475a3efb23a94b1e
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static LIST_HEAD(regulator_ena_gpio_list); 55static bool has_full_constraints; 56static bool board_wants_dummy_regulator; 57 58static struct dentry *debugfs_root; 59 60/* 61 * struct regulator_map 62 * 63 * Used to provide symbolic supply names to devices. 64 */ 65struct regulator_map { 66 struct list_head list; 67 const char *dev_name; /* The dev_name() for the consumer */ 68 const char *supply; 69 struct regulator_dev *regulator; 70}; 71 72/* 73 * struct regulator_enable_gpio 74 * 75 * Management for shared enable GPIO pin 76 */ 77struct regulator_enable_gpio { 78 struct list_head list; 79 int gpio; 80 u32 enable_count; /* a number of enabled shared GPIO */ 81 u32 request_count; /* a number of requested shared GPIO */ 82 unsigned int ena_gpio_invert:1; 83}; 84 85/* 86 * struct regulator 87 * 88 * One for each consumer device. 89 */ 90struct regulator { 91 struct device *dev; 92 struct list_head list; 93 unsigned int always_on:1; 94 unsigned int bypass:1; 95 int uA_load; 96 int min_uV; 97 int max_uV; 98 char *supply_name; 99 struct device_attribute dev_attr; 100 struct regulator_dev *rdev; 101 struct dentry *debugfs; 102}; 103 104static int _regulator_is_enabled(struct regulator_dev *rdev); 105static int _regulator_disable(struct regulator_dev *rdev); 106static int _regulator_get_voltage(struct regulator_dev *rdev); 107static int _regulator_get_current_limit(struct regulator_dev *rdev); 108static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 109static void _notifier_call_chain(struct regulator_dev *rdev, 110 unsigned long event, void *data); 111static int _regulator_do_set_voltage(struct regulator_dev *rdev, 112 int min_uV, int max_uV); 113static struct regulator *create_regulator(struct regulator_dev *rdev, 114 struct device *dev, 115 const char *supply_name); 116 117static const char *rdev_get_name(struct regulator_dev *rdev) 118{ 119 if (rdev->constraints && rdev->constraints->name) 120 return rdev->constraints->name; 121 else if (rdev->desc->name) 122 return rdev->desc->name; 123 else 124 return ""; 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t regulator_name_show(struct device *dev, 327 struct device_attribute *attr, char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333 334static ssize_t regulator_print_opmode(char *buf, int mode) 335{ 336 switch (mode) { 337 case REGULATOR_MODE_FAST: 338 return sprintf(buf, "fast\n"); 339 case REGULATOR_MODE_NORMAL: 340 return sprintf(buf, "normal\n"); 341 case REGULATOR_MODE_IDLE: 342 return sprintf(buf, "idle\n"); 343 case REGULATOR_MODE_STANDBY: 344 return sprintf(buf, "standby\n"); 345 } 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_opmode_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 354 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 355} 356static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 357 358static ssize_t regulator_print_state(char *buf, int state) 359{ 360 if (state > 0) 361 return sprintf(buf, "enabled\n"); 362 else if (state == 0) 363 return sprintf(buf, "disabled\n"); 364 else 365 return sprintf(buf, "unknown\n"); 366} 367 368static ssize_t regulator_state_show(struct device *dev, 369 struct device_attribute *attr, char *buf) 370{ 371 struct regulator_dev *rdev = dev_get_drvdata(dev); 372 ssize_t ret; 373 374 mutex_lock(&rdev->mutex); 375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 376 mutex_unlock(&rdev->mutex); 377 378 return ret; 379} 380static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 381 382static ssize_t regulator_status_show(struct device *dev, 383 struct device_attribute *attr, char *buf) 384{ 385 struct regulator_dev *rdev = dev_get_drvdata(dev); 386 int status; 387 char *label; 388 389 status = rdev->desc->ops->get_status(rdev); 390 if (status < 0) 391 return status; 392 393 switch (status) { 394 case REGULATOR_STATUS_OFF: 395 label = "off"; 396 break; 397 case REGULATOR_STATUS_ON: 398 label = "on"; 399 break; 400 case REGULATOR_STATUS_ERROR: 401 label = "error"; 402 break; 403 case REGULATOR_STATUS_FAST: 404 label = "fast"; 405 break; 406 case REGULATOR_STATUS_NORMAL: 407 label = "normal"; 408 break; 409 case REGULATOR_STATUS_IDLE: 410 label = "idle"; 411 break; 412 case REGULATOR_STATUS_STANDBY: 413 label = "standby"; 414 break; 415 case REGULATOR_STATUS_BYPASS: 416 label = "bypass"; 417 break; 418 case REGULATOR_STATUS_UNDEFINED: 419 label = "undefined"; 420 break; 421 default: 422 return -ERANGE; 423 } 424 425 return sprintf(buf, "%s\n", label); 426} 427static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 428 429static ssize_t regulator_min_uA_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431{ 432 struct regulator_dev *rdev = dev_get_drvdata(dev); 433 434 if (!rdev->constraints) 435 return sprintf(buf, "constraint not defined\n"); 436 437 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 438} 439static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 440 441static ssize_t regulator_max_uA_show(struct device *dev, 442 struct device_attribute *attr, char *buf) 443{ 444 struct regulator_dev *rdev = dev_get_drvdata(dev); 445 446 if (!rdev->constraints) 447 return sprintf(buf, "constraint not defined\n"); 448 449 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 450} 451static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 452 453static ssize_t regulator_min_uV_show(struct device *dev, 454 struct device_attribute *attr, char *buf) 455{ 456 struct regulator_dev *rdev = dev_get_drvdata(dev); 457 458 if (!rdev->constraints) 459 return sprintf(buf, "constraint not defined\n"); 460 461 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 462} 463static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 464 465static ssize_t regulator_max_uV_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467{ 468 struct regulator_dev *rdev = dev_get_drvdata(dev); 469 470 if (!rdev->constraints) 471 return sprintf(buf, "constraint not defined\n"); 472 473 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 474} 475static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 476 477static ssize_t regulator_total_uA_show(struct device *dev, 478 struct device_attribute *attr, char *buf) 479{ 480 struct regulator_dev *rdev = dev_get_drvdata(dev); 481 struct regulator *regulator; 482 int uA = 0; 483 484 mutex_lock(&rdev->mutex); 485 list_for_each_entry(regulator, &rdev->consumer_list, list) 486 uA += regulator->uA_load; 487 mutex_unlock(&rdev->mutex); 488 return sprintf(buf, "%d\n", uA); 489} 490static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 491 492static ssize_t regulator_num_users_show(struct device *dev, 493 struct device_attribute *attr, char *buf) 494{ 495 struct regulator_dev *rdev = dev_get_drvdata(dev); 496 return sprintf(buf, "%d\n", rdev->use_count); 497} 498 499static ssize_t regulator_type_show(struct device *dev, 500 struct device_attribute *attr, char *buf) 501{ 502 struct regulator_dev *rdev = dev_get_drvdata(dev); 503 504 switch (rdev->desc->type) { 505 case REGULATOR_VOLTAGE: 506 return sprintf(buf, "voltage\n"); 507 case REGULATOR_CURRENT: 508 return sprintf(buf, "current\n"); 509 } 510 return sprintf(buf, "unknown\n"); 511} 512 513static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 514 struct device_attribute *attr, char *buf) 515{ 516 struct regulator_dev *rdev = dev_get_drvdata(dev); 517 518 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 519} 520static DEVICE_ATTR(suspend_mem_microvolts, 0444, 521 regulator_suspend_mem_uV_show, NULL); 522 523static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 524 struct device_attribute *attr, char *buf) 525{ 526 struct regulator_dev *rdev = dev_get_drvdata(dev); 527 528 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 529} 530static DEVICE_ATTR(suspend_disk_microvolts, 0444, 531 regulator_suspend_disk_uV_show, NULL); 532 533static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 534 struct device_attribute *attr, char *buf) 535{ 536 struct regulator_dev *rdev = dev_get_drvdata(dev); 537 538 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 539} 540static DEVICE_ATTR(suspend_standby_microvolts, 0444, 541 regulator_suspend_standby_uV_show, NULL); 542 543static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545{ 546 struct regulator_dev *rdev = dev_get_drvdata(dev); 547 548 return regulator_print_opmode(buf, 549 rdev->constraints->state_mem.mode); 550} 551static DEVICE_ATTR(suspend_mem_mode, 0444, 552 regulator_suspend_mem_mode_show, NULL); 553 554static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 555 struct device_attribute *attr, char *buf) 556{ 557 struct regulator_dev *rdev = dev_get_drvdata(dev); 558 559 return regulator_print_opmode(buf, 560 rdev->constraints->state_disk.mode); 561} 562static DEVICE_ATTR(suspend_disk_mode, 0444, 563 regulator_suspend_disk_mode_show, NULL); 564 565static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 566 struct device_attribute *attr, char *buf) 567{ 568 struct regulator_dev *rdev = dev_get_drvdata(dev); 569 570 return regulator_print_opmode(buf, 571 rdev->constraints->state_standby.mode); 572} 573static DEVICE_ATTR(suspend_standby_mode, 0444, 574 regulator_suspend_standby_mode_show, NULL); 575 576static ssize_t regulator_suspend_mem_state_show(struct device *dev, 577 struct device_attribute *attr, char *buf) 578{ 579 struct regulator_dev *rdev = dev_get_drvdata(dev); 580 581 return regulator_print_state(buf, 582 rdev->constraints->state_mem.enabled); 583} 584static DEVICE_ATTR(suspend_mem_state, 0444, 585 regulator_suspend_mem_state_show, NULL); 586 587static ssize_t regulator_suspend_disk_state_show(struct device *dev, 588 struct device_attribute *attr, char *buf) 589{ 590 struct regulator_dev *rdev = dev_get_drvdata(dev); 591 592 return regulator_print_state(buf, 593 rdev->constraints->state_disk.enabled); 594} 595static DEVICE_ATTR(suspend_disk_state, 0444, 596 regulator_suspend_disk_state_show, NULL); 597 598static ssize_t regulator_suspend_standby_state_show(struct device *dev, 599 struct device_attribute *attr, char *buf) 600{ 601 struct regulator_dev *rdev = dev_get_drvdata(dev); 602 603 return regulator_print_state(buf, 604 rdev->constraints->state_standby.enabled); 605} 606static DEVICE_ATTR(suspend_standby_state, 0444, 607 regulator_suspend_standby_state_show, NULL); 608 609static ssize_t regulator_bypass_show(struct device *dev, 610 struct device_attribute *attr, char *buf) 611{ 612 struct regulator_dev *rdev = dev_get_drvdata(dev); 613 const char *report; 614 bool bypass; 615 int ret; 616 617 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 618 619 if (ret != 0) 620 report = "unknown"; 621 else if (bypass) 622 report = "enabled"; 623 else 624 report = "disabled"; 625 626 return sprintf(buf, "%s\n", report); 627} 628static DEVICE_ATTR(bypass, 0444, 629 regulator_bypass_show, NULL); 630 631/* 632 * These are the only attributes are present for all regulators. 633 * Other attributes are a function of regulator functionality. 634 */ 635static struct device_attribute regulator_dev_attrs[] = { 636 __ATTR(name, 0444, regulator_name_show, NULL), 637 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 638 __ATTR(type, 0444, regulator_type_show, NULL), 639 __ATTR_NULL, 640}; 641 642static void regulator_dev_release(struct device *dev) 643{ 644 struct regulator_dev *rdev = dev_get_drvdata(dev); 645 kfree(rdev); 646} 647 648static struct class regulator_class = { 649 .name = "regulator", 650 .dev_release = regulator_dev_release, 651 .dev_attrs = regulator_dev_attrs, 652}; 653 654/* Calculate the new optimum regulator operating mode based on the new total 655 * consumer load. All locks held by caller */ 656static void drms_uA_update(struct regulator_dev *rdev) 657{ 658 struct regulator *sibling; 659 int current_uA = 0, output_uV, input_uV, err; 660 unsigned int mode; 661 662 err = regulator_check_drms(rdev); 663 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 664 (!rdev->desc->ops->get_voltage && 665 !rdev->desc->ops->get_voltage_sel) || 666 !rdev->desc->ops->set_mode) 667 return; 668 669 /* get output voltage */ 670 output_uV = _regulator_get_voltage(rdev); 671 if (output_uV <= 0) 672 return; 673 674 /* get input voltage */ 675 input_uV = 0; 676 if (rdev->supply) 677 input_uV = regulator_get_voltage(rdev->supply); 678 if (input_uV <= 0) 679 input_uV = rdev->constraints->input_uV; 680 if (input_uV <= 0) 681 return; 682 683 /* calc total requested load */ 684 list_for_each_entry(sibling, &rdev->consumer_list, list) 685 current_uA += sibling->uA_load; 686 687 /* now get the optimum mode for our new total regulator load */ 688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 689 output_uV, current_uA); 690 691 /* check the new mode is allowed */ 692 err = regulator_mode_constrain(rdev, &mode); 693 if (err == 0) 694 rdev->desc->ops->set_mode(rdev, mode); 695} 696 697static int suspend_set_state(struct regulator_dev *rdev, 698 struct regulator_state *rstate) 699{ 700 int ret = 0; 701 702 /* If we have no suspend mode configration don't set anything; 703 * only warn if the driver implements set_suspend_voltage or 704 * set_suspend_mode callback. 705 */ 706 if (!rstate->enabled && !rstate->disabled) { 707 if (rdev->desc->ops->set_suspend_voltage || 708 rdev->desc->ops->set_suspend_mode) 709 rdev_warn(rdev, "No configuration\n"); 710 return 0; 711 } 712 713 if (rstate->enabled && rstate->disabled) { 714 rdev_err(rdev, "invalid configuration\n"); 715 return -EINVAL; 716 } 717 718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 719 ret = rdev->desc->ops->set_suspend_enable(rdev); 720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 721 ret = rdev->desc->ops->set_suspend_disable(rdev); 722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 723 ret = 0; 724 725 if (ret < 0) { 726 rdev_err(rdev, "failed to enabled/disable\n"); 727 return ret; 728 } 729 730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 732 if (ret < 0) { 733 rdev_err(rdev, "failed to set voltage\n"); 734 return ret; 735 } 736 } 737 738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 740 if (ret < 0) { 741 rdev_err(rdev, "failed to set mode\n"); 742 return ret; 743 } 744 } 745 return ret; 746} 747 748/* locks held by caller */ 749static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 750{ 751 if (!rdev->constraints) 752 return -EINVAL; 753 754 switch (state) { 755 case PM_SUSPEND_STANDBY: 756 return suspend_set_state(rdev, 757 &rdev->constraints->state_standby); 758 case PM_SUSPEND_MEM: 759 return suspend_set_state(rdev, 760 &rdev->constraints->state_mem); 761 case PM_SUSPEND_MAX: 762 return suspend_set_state(rdev, 763 &rdev->constraints->state_disk); 764 default: 765 return -EINVAL; 766 } 767} 768 769static void print_constraints(struct regulator_dev *rdev) 770{ 771 struct regulation_constraints *constraints = rdev->constraints; 772 char buf[80] = ""; 773 int count = 0; 774 int ret; 775 776 if (constraints->min_uV && constraints->max_uV) { 777 if (constraints->min_uV == constraints->max_uV) 778 count += sprintf(buf + count, "%d mV ", 779 constraints->min_uV / 1000); 780 else 781 count += sprintf(buf + count, "%d <--> %d mV ", 782 constraints->min_uV / 1000, 783 constraints->max_uV / 1000); 784 } 785 786 if (!constraints->min_uV || 787 constraints->min_uV != constraints->max_uV) { 788 ret = _regulator_get_voltage(rdev); 789 if (ret > 0) 790 count += sprintf(buf + count, "at %d mV ", ret / 1000); 791 } 792 793 if (constraints->uV_offset) 794 count += sprintf(buf, "%dmV offset ", 795 constraints->uV_offset / 1000); 796 797 if (constraints->min_uA && constraints->max_uA) { 798 if (constraints->min_uA == constraints->max_uA) 799 count += sprintf(buf + count, "%d mA ", 800 constraints->min_uA / 1000); 801 else 802 count += sprintf(buf + count, "%d <--> %d mA ", 803 constraints->min_uA / 1000, 804 constraints->max_uA / 1000); 805 } 806 807 if (!constraints->min_uA || 808 constraints->min_uA != constraints->max_uA) { 809 ret = _regulator_get_current_limit(rdev); 810 if (ret > 0) 811 count += sprintf(buf + count, "at %d mA ", ret / 1000); 812 } 813 814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 815 count += sprintf(buf + count, "fast "); 816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 817 count += sprintf(buf + count, "normal "); 818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 819 count += sprintf(buf + count, "idle "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 821 count += sprintf(buf + count, "standby"); 822 823 if (!count) 824 sprintf(buf, "no parameters"); 825 826 rdev_info(rdev, "%s\n", buf); 827 828 if ((constraints->min_uV != constraints->max_uV) && 829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 830 rdev_warn(rdev, 831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 832} 833 834static int machine_constraints_voltage(struct regulator_dev *rdev, 835 struct regulation_constraints *constraints) 836{ 837 struct regulator_ops *ops = rdev->desc->ops; 838 int ret; 839 840 /* do we need to apply the constraint voltage */ 841 if (rdev->constraints->apply_uV && 842 rdev->constraints->min_uV == rdev->constraints->max_uV) { 843 ret = _regulator_do_set_voltage(rdev, 844 rdev->constraints->min_uV, 845 rdev->constraints->max_uV); 846 if (ret < 0) { 847 rdev_err(rdev, "failed to apply %duV constraint\n", 848 rdev->constraints->min_uV); 849 return ret; 850 } 851 } 852 853 /* constrain machine-level voltage specs to fit 854 * the actual range supported by this regulator. 855 */ 856 if (ops->list_voltage && rdev->desc->n_voltages) { 857 int count = rdev->desc->n_voltages; 858 int i; 859 int min_uV = INT_MAX; 860 int max_uV = INT_MIN; 861 int cmin = constraints->min_uV; 862 int cmax = constraints->max_uV; 863 864 /* it's safe to autoconfigure fixed-voltage supplies 865 and the constraints are used by list_voltage. */ 866 if (count == 1 && !cmin) { 867 cmin = 1; 868 cmax = INT_MAX; 869 constraints->min_uV = cmin; 870 constraints->max_uV = cmax; 871 } 872 873 /* voltage constraints are optional */ 874 if ((cmin == 0) && (cmax == 0)) 875 return 0; 876 877 /* else require explicit machine-level constraints */ 878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 879 rdev_err(rdev, "invalid voltage constraints\n"); 880 return -EINVAL; 881 } 882 883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 884 for (i = 0; i < count; i++) { 885 int value; 886 887 value = ops->list_voltage(rdev, i); 888 if (value <= 0) 889 continue; 890 891 /* maybe adjust [min_uV..max_uV] */ 892 if (value >= cmin && value < min_uV) 893 min_uV = value; 894 if (value <= cmax && value > max_uV) 895 max_uV = value; 896 } 897 898 /* final: [min_uV..max_uV] valid iff constraints valid */ 899 if (max_uV < min_uV) { 900 rdev_err(rdev, 901 "unsupportable voltage constraints %u-%uuV\n", 902 min_uV, max_uV); 903 return -EINVAL; 904 } 905 906 /* use regulator's subset of machine constraints */ 907 if (constraints->min_uV < min_uV) { 908 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 909 constraints->min_uV, min_uV); 910 constraints->min_uV = min_uV; 911 } 912 if (constraints->max_uV > max_uV) { 913 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 914 constraints->max_uV, max_uV); 915 constraints->max_uV = max_uV; 916 } 917 } 918 919 return 0; 920} 921 922/** 923 * set_machine_constraints - sets regulator constraints 924 * @rdev: regulator source 925 * @constraints: constraints to apply 926 * 927 * Allows platform initialisation code to define and constrain 928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 929 * Constraints *must* be set by platform code in order for some 930 * regulator operations to proceed i.e. set_voltage, set_current_limit, 931 * set_mode. 932 */ 933static int set_machine_constraints(struct regulator_dev *rdev, 934 const struct regulation_constraints *constraints) 935{ 936 int ret = 0; 937 struct regulator_ops *ops = rdev->desc->ops; 938 939 if (constraints) 940 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 941 GFP_KERNEL); 942 else 943 rdev->constraints = kzalloc(sizeof(*constraints), 944 GFP_KERNEL); 945 if (!rdev->constraints) 946 return -ENOMEM; 947 948 ret = machine_constraints_voltage(rdev, rdev->constraints); 949 if (ret != 0) 950 goto out; 951 952 /* do we need to setup our suspend state */ 953 if (rdev->constraints->initial_state) { 954 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 955 if (ret < 0) { 956 rdev_err(rdev, "failed to set suspend state\n"); 957 goto out; 958 } 959 } 960 961 if (rdev->constraints->initial_mode) { 962 if (!ops->set_mode) { 963 rdev_err(rdev, "no set_mode operation\n"); 964 ret = -EINVAL; 965 goto out; 966 } 967 968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 969 if (ret < 0) { 970 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 971 goto out; 972 } 973 } 974 975 /* If the constraints say the regulator should be on at this point 976 * and we have control then make sure it is enabled. 977 */ 978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 979 ops->enable) { 980 ret = ops->enable(rdev); 981 if (ret < 0) { 982 rdev_err(rdev, "failed to enable\n"); 983 goto out; 984 } 985 } 986 987 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 988 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 989 if (ret < 0) { 990 rdev_err(rdev, "failed to set ramp_delay\n"); 991 goto out; 992 } 993 } 994 995 print_constraints(rdev); 996 return 0; 997out: 998 kfree(rdev->constraints); 999 rdev->constraints = NULL; 1000 return ret; 1001} 1002 1003/** 1004 * set_supply - set regulator supply regulator 1005 * @rdev: regulator name 1006 * @supply_rdev: supply regulator name 1007 * 1008 * Called by platform initialisation code to set the supply regulator for this 1009 * regulator. This ensures that a regulators supply will also be enabled by the 1010 * core if it's child is enabled. 1011 */ 1012static int set_supply(struct regulator_dev *rdev, 1013 struct regulator_dev *supply_rdev) 1014{ 1015 int err; 1016 1017 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1018 1019 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1020 if (rdev->supply == NULL) { 1021 err = -ENOMEM; 1022 return err; 1023 } 1024 supply_rdev->open_count++; 1025 1026 return 0; 1027} 1028 1029/** 1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1031 * @rdev: regulator source 1032 * @consumer_dev_name: dev_name() string for device supply applies to 1033 * @supply: symbolic name for supply 1034 * 1035 * Allows platform initialisation code to map physical regulator 1036 * sources to symbolic names for supplies for use by devices. Devices 1037 * should use these symbolic names to request regulators, avoiding the 1038 * need to provide board-specific regulator names as platform data. 1039 */ 1040static int set_consumer_device_supply(struct regulator_dev *rdev, 1041 const char *consumer_dev_name, 1042 const char *supply) 1043{ 1044 struct regulator_map *node; 1045 int has_dev; 1046 1047 if (supply == NULL) 1048 return -EINVAL; 1049 1050 if (consumer_dev_name != NULL) 1051 has_dev = 1; 1052 else 1053 has_dev = 0; 1054 1055 list_for_each_entry(node, ®ulator_map_list, list) { 1056 if (node->dev_name && consumer_dev_name) { 1057 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1058 continue; 1059 } else if (node->dev_name || consumer_dev_name) { 1060 continue; 1061 } 1062 1063 if (strcmp(node->supply, supply) != 0) 1064 continue; 1065 1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1067 consumer_dev_name, 1068 dev_name(&node->regulator->dev), 1069 node->regulator->desc->name, 1070 supply, 1071 dev_name(&rdev->dev), rdev_get_name(rdev)); 1072 return -EBUSY; 1073 } 1074 1075 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1076 if (node == NULL) 1077 return -ENOMEM; 1078 1079 node->regulator = rdev; 1080 node->supply = supply; 1081 1082 if (has_dev) { 1083 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1084 if (node->dev_name == NULL) { 1085 kfree(node); 1086 return -ENOMEM; 1087 } 1088 } 1089 1090 list_add(&node->list, ®ulator_map_list); 1091 return 0; 1092} 1093 1094static void unset_regulator_supplies(struct regulator_dev *rdev) 1095{ 1096 struct regulator_map *node, *n; 1097 1098 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1099 if (rdev == node->regulator) { 1100 list_del(&node->list); 1101 kfree(node->dev_name); 1102 kfree(node); 1103 } 1104 } 1105} 1106 1107#define REG_STR_SIZE 64 1108 1109static struct regulator *create_regulator(struct regulator_dev *rdev, 1110 struct device *dev, 1111 const char *supply_name) 1112{ 1113 struct regulator *regulator; 1114 char buf[REG_STR_SIZE]; 1115 int err, size; 1116 1117 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1118 if (regulator == NULL) 1119 return NULL; 1120 1121 mutex_lock(&rdev->mutex); 1122 regulator->rdev = rdev; 1123 list_add(®ulator->list, &rdev->consumer_list); 1124 1125 if (dev) { 1126 regulator->dev = dev; 1127 1128 /* Add a link to the device sysfs entry */ 1129 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1130 dev->kobj.name, supply_name); 1131 if (size >= REG_STR_SIZE) 1132 goto overflow_err; 1133 1134 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1135 if (regulator->supply_name == NULL) 1136 goto overflow_err; 1137 1138 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1139 buf); 1140 if (err) { 1141 rdev_warn(rdev, "could not add device link %s err %d\n", 1142 dev->kobj.name, err); 1143 /* non-fatal */ 1144 } 1145 } else { 1146 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1147 if (regulator->supply_name == NULL) 1148 goto overflow_err; 1149 } 1150 1151 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1152 rdev->debugfs); 1153 if (!regulator->debugfs) { 1154 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1155 } else { 1156 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1157 ®ulator->uA_load); 1158 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1159 ®ulator->min_uV); 1160 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1161 ®ulator->max_uV); 1162 } 1163 1164 /* 1165 * Check now if the regulator is an always on regulator - if 1166 * it is then we don't need to do nearly so much work for 1167 * enable/disable calls. 1168 */ 1169 if (!_regulator_can_change_status(rdev) && 1170 _regulator_is_enabled(rdev)) 1171 regulator->always_on = true; 1172 1173 mutex_unlock(&rdev->mutex); 1174 return regulator; 1175overflow_err: 1176 list_del(®ulator->list); 1177 kfree(regulator); 1178 mutex_unlock(&rdev->mutex); 1179 return NULL; 1180} 1181 1182static int _regulator_get_enable_time(struct regulator_dev *rdev) 1183{ 1184 if (!rdev->desc->ops->enable_time) 1185 return rdev->desc->enable_time; 1186 return rdev->desc->ops->enable_time(rdev); 1187} 1188 1189static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1190 const char *supply, 1191 int *ret) 1192{ 1193 struct regulator_dev *r; 1194 struct device_node *node; 1195 struct regulator_map *map; 1196 const char *devname = NULL; 1197 1198 /* first do a dt based lookup */ 1199 if (dev && dev->of_node) { 1200 node = of_get_regulator(dev, supply); 1201 if (node) { 1202 list_for_each_entry(r, ®ulator_list, list) 1203 if (r->dev.parent && 1204 node == r->dev.of_node) 1205 return r; 1206 } else { 1207 /* 1208 * If we couldn't even get the node then it's 1209 * not just that the device didn't register 1210 * yet, there's no node and we'll never 1211 * succeed. 1212 */ 1213 *ret = -ENODEV; 1214 } 1215 } 1216 1217 /* if not found, try doing it non-dt way */ 1218 if (dev) 1219 devname = dev_name(dev); 1220 1221 list_for_each_entry(r, ®ulator_list, list) 1222 if (strcmp(rdev_get_name(r), supply) == 0) 1223 return r; 1224 1225 list_for_each_entry(map, ®ulator_map_list, list) { 1226 /* If the mapping has a device set up it must match */ 1227 if (map->dev_name && 1228 (!devname || strcmp(map->dev_name, devname))) 1229 continue; 1230 1231 if (strcmp(map->supply, supply) == 0) 1232 return map->regulator; 1233 } 1234 1235 1236 return NULL; 1237} 1238 1239/* Internal regulator request function */ 1240static struct regulator *_regulator_get(struct device *dev, const char *id, 1241 int exclusive) 1242{ 1243 struct regulator_dev *rdev; 1244 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1245 const char *devname = NULL; 1246 int ret = 0; 1247 1248 if (id == NULL) { 1249 pr_err("get() with no identifier\n"); 1250 return regulator; 1251 } 1252 1253 if (dev) 1254 devname = dev_name(dev); 1255 1256 mutex_lock(®ulator_list_mutex); 1257 1258 rdev = regulator_dev_lookup(dev, id, &ret); 1259 if (rdev) 1260 goto found; 1261 1262 /* 1263 * If we have return value from dev_lookup fail, we do not expect to 1264 * succeed, so, quit with appropriate error value 1265 */ 1266 if (ret) { 1267 regulator = ERR_PTR(ret); 1268 goto out; 1269 } 1270 1271 if (board_wants_dummy_regulator) { 1272 rdev = dummy_regulator_rdev; 1273 goto found; 1274 } 1275 1276#ifdef CONFIG_REGULATOR_DUMMY 1277 if (!devname) 1278 devname = "deviceless"; 1279 1280 /* If the board didn't flag that it was fully constrained then 1281 * substitute in a dummy regulator so consumers can continue. 1282 */ 1283 if (!has_full_constraints) { 1284 pr_warn("%s supply %s not found, using dummy regulator\n", 1285 devname, id); 1286 rdev = dummy_regulator_rdev; 1287 goto found; 1288 } 1289#endif 1290 1291 mutex_unlock(®ulator_list_mutex); 1292 return regulator; 1293 1294found: 1295 if (rdev->exclusive) { 1296 regulator = ERR_PTR(-EPERM); 1297 goto out; 1298 } 1299 1300 if (exclusive && rdev->open_count) { 1301 regulator = ERR_PTR(-EBUSY); 1302 goto out; 1303 } 1304 1305 if (!try_module_get(rdev->owner)) 1306 goto out; 1307 1308 regulator = create_regulator(rdev, dev, id); 1309 if (regulator == NULL) { 1310 regulator = ERR_PTR(-ENOMEM); 1311 module_put(rdev->owner); 1312 goto out; 1313 } 1314 1315 rdev->open_count++; 1316 if (exclusive) { 1317 rdev->exclusive = 1; 1318 1319 ret = _regulator_is_enabled(rdev); 1320 if (ret > 0) 1321 rdev->use_count = 1; 1322 else 1323 rdev->use_count = 0; 1324 } 1325 1326out: 1327 mutex_unlock(®ulator_list_mutex); 1328 1329 return regulator; 1330} 1331 1332/** 1333 * regulator_get - lookup and obtain a reference to a regulator. 1334 * @dev: device for regulator "consumer" 1335 * @id: Supply name or regulator ID. 1336 * 1337 * Returns a struct regulator corresponding to the regulator producer, 1338 * or IS_ERR() condition containing errno. 1339 * 1340 * Use of supply names configured via regulator_set_device_supply() is 1341 * strongly encouraged. It is recommended that the supply name used 1342 * should match the name used for the supply and/or the relevant 1343 * device pins in the datasheet. 1344 */ 1345struct regulator *regulator_get(struct device *dev, const char *id) 1346{ 1347 return _regulator_get(dev, id, 0); 1348} 1349EXPORT_SYMBOL_GPL(regulator_get); 1350 1351static void devm_regulator_release(struct device *dev, void *res) 1352{ 1353 regulator_put(*(struct regulator **)res); 1354} 1355 1356/** 1357 * devm_regulator_get - Resource managed regulator_get() 1358 * @dev: device for regulator "consumer" 1359 * @id: Supply name or regulator ID. 1360 * 1361 * Managed regulator_get(). Regulators returned from this function are 1362 * automatically regulator_put() on driver detach. See regulator_get() for more 1363 * information. 1364 */ 1365struct regulator *devm_regulator_get(struct device *dev, const char *id) 1366{ 1367 struct regulator **ptr, *regulator; 1368 1369 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1370 if (!ptr) 1371 return ERR_PTR(-ENOMEM); 1372 1373 regulator = regulator_get(dev, id); 1374 if (!IS_ERR(regulator)) { 1375 *ptr = regulator; 1376 devres_add(dev, ptr); 1377 } else { 1378 devres_free(ptr); 1379 } 1380 1381 return regulator; 1382} 1383EXPORT_SYMBOL_GPL(devm_regulator_get); 1384 1385/** 1386 * regulator_get_exclusive - obtain exclusive access to a regulator. 1387 * @dev: device for regulator "consumer" 1388 * @id: Supply name or regulator ID. 1389 * 1390 * Returns a struct regulator corresponding to the regulator producer, 1391 * or IS_ERR() condition containing errno. Other consumers will be 1392 * unable to obtain this reference is held and the use count for the 1393 * regulator will be initialised to reflect the current state of the 1394 * regulator. 1395 * 1396 * This is intended for use by consumers which cannot tolerate shared 1397 * use of the regulator such as those which need to force the 1398 * regulator off for correct operation of the hardware they are 1399 * controlling. 1400 * 1401 * Use of supply names configured via regulator_set_device_supply() is 1402 * strongly encouraged. It is recommended that the supply name used 1403 * should match the name used for the supply and/or the relevant 1404 * device pins in the datasheet. 1405 */ 1406struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1407{ 1408 return _regulator_get(dev, id, 1); 1409} 1410EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1411 1412/* Locks held by regulator_put() */ 1413static void _regulator_put(struct regulator *regulator) 1414{ 1415 struct regulator_dev *rdev; 1416 1417 if (regulator == NULL || IS_ERR(regulator)) 1418 return; 1419 1420 rdev = regulator->rdev; 1421 1422 debugfs_remove_recursive(regulator->debugfs); 1423 1424 /* remove any sysfs entries */ 1425 if (regulator->dev) 1426 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1427 kfree(regulator->supply_name); 1428 list_del(®ulator->list); 1429 kfree(regulator); 1430 1431 rdev->open_count--; 1432 rdev->exclusive = 0; 1433 1434 module_put(rdev->owner); 1435} 1436 1437/** 1438 * regulator_put - "free" the regulator source 1439 * @regulator: regulator source 1440 * 1441 * Note: drivers must ensure that all regulator_enable calls made on this 1442 * regulator source are balanced by regulator_disable calls prior to calling 1443 * this function. 1444 */ 1445void regulator_put(struct regulator *regulator) 1446{ 1447 mutex_lock(®ulator_list_mutex); 1448 _regulator_put(regulator); 1449 mutex_unlock(®ulator_list_mutex); 1450} 1451EXPORT_SYMBOL_GPL(regulator_put); 1452 1453static int devm_regulator_match(struct device *dev, void *res, void *data) 1454{ 1455 struct regulator **r = res; 1456 if (!r || !*r) { 1457 WARN_ON(!r || !*r); 1458 return 0; 1459 } 1460 return *r == data; 1461} 1462 1463/** 1464 * devm_regulator_put - Resource managed regulator_put() 1465 * @regulator: regulator to free 1466 * 1467 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1468 * this function will not need to be called and the resource management 1469 * code will ensure that the resource is freed. 1470 */ 1471void devm_regulator_put(struct regulator *regulator) 1472{ 1473 int rc; 1474 1475 rc = devres_release(regulator->dev, devm_regulator_release, 1476 devm_regulator_match, regulator); 1477 if (rc != 0) 1478 WARN_ON(rc); 1479} 1480EXPORT_SYMBOL_GPL(devm_regulator_put); 1481 1482/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1483static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1484 const struct regulator_config *config) 1485{ 1486 struct regulator_enable_gpio *pin; 1487 int ret; 1488 1489 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1490 if (pin->gpio == config->ena_gpio) { 1491 rdev_dbg(rdev, "GPIO %d is already used\n", 1492 config->ena_gpio); 1493 goto update_ena_gpio_to_rdev; 1494 } 1495 } 1496 1497 ret = gpio_request_one(config->ena_gpio, 1498 GPIOF_DIR_OUT | config->ena_gpio_flags, 1499 rdev_get_name(rdev)); 1500 if (ret) 1501 return ret; 1502 1503 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1504 if (pin == NULL) { 1505 gpio_free(config->ena_gpio); 1506 return -ENOMEM; 1507 } 1508 1509 pin->gpio = config->ena_gpio; 1510 pin->ena_gpio_invert = config->ena_gpio_invert; 1511 list_add(&pin->list, ®ulator_ena_gpio_list); 1512 1513update_ena_gpio_to_rdev: 1514 pin->request_count++; 1515 rdev->ena_pin = pin; 1516 return 0; 1517} 1518 1519static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1520{ 1521 struct regulator_enable_gpio *pin, *n; 1522 1523 if (!rdev->ena_pin) 1524 return; 1525 1526 /* Free the GPIO only in case of no use */ 1527 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1528 if (pin->gpio == rdev->ena_pin->gpio) { 1529 if (pin->request_count <= 1) { 1530 pin->request_count = 0; 1531 gpio_free(pin->gpio); 1532 list_del(&pin->list); 1533 kfree(pin); 1534 } else { 1535 pin->request_count--; 1536 } 1537 } 1538 } 1539} 1540 1541/** 1542 * Balance enable_count of each GPIO and actual GPIO pin control. 1543 * GPIO is enabled in case of initial use. (enable_count is 0) 1544 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1545 */ 1546static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1547{ 1548 struct regulator_enable_gpio *pin = rdev->ena_pin; 1549 1550 if (!pin) 1551 return -EINVAL; 1552 1553 if (enable) { 1554 /* Enable GPIO at initial use */ 1555 if (pin->enable_count == 0) 1556 gpio_set_value_cansleep(pin->gpio, 1557 !pin->ena_gpio_invert); 1558 1559 pin->enable_count++; 1560 } else { 1561 if (pin->enable_count > 1) { 1562 pin->enable_count--; 1563 return 0; 1564 } 1565 1566 /* Disable GPIO if not used */ 1567 if (pin->enable_count <= 1) { 1568 gpio_set_value_cansleep(pin->gpio, 1569 pin->ena_gpio_invert); 1570 pin->enable_count = 0; 1571 } 1572 } 1573 1574 return 0; 1575} 1576 1577static int _regulator_do_enable(struct regulator_dev *rdev) 1578{ 1579 int ret, delay; 1580 1581 /* Query before enabling in case configuration dependent. */ 1582 ret = _regulator_get_enable_time(rdev); 1583 if (ret >= 0) { 1584 delay = ret; 1585 } else { 1586 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1587 delay = 0; 1588 } 1589 1590 trace_regulator_enable(rdev_get_name(rdev)); 1591 1592 if (rdev->ena_pin) { 1593 ret = regulator_ena_gpio_ctrl(rdev, true); 1594 if (ret < 0) 1595 return ret; 1596 rdev->ena_gpio_state = 1; 1597 } else if (rdev->desc->ops->enable) { 1598 ret = rdev->desc->ops->enable(rdev); 1599 if (ret < 0) 1600 return ret; 1601 } else { 1602 return -EINVAL; 1603 } 1604 1605 /* Allow the regulator to ramp; it would be useful to extend 1606 * this for bulk operations so that the regulators can ramp 1607 * together. */ 1608 trace_regulator_enable_delay(rdev_get_name(rdev)); 1609 1610 if (delay >= 1000) { 1611 mdelay(delay / 1000); 1612 udelay(delay % 1000); 1613 } else if (delay) { 1614 udelay(delay); 1615 } 1616 1617 trace_regulator_enable_complete(rdev_get_name(rdev)); 1618 1619 return 0; 1620} 1621 1622/* locks held by regulator_enable() */ 1623static int _regulator_enable(struct regulator_dev *rdev) 1624{ 1625 int ret; 1626 1627 /* check voltage and requested load before enabling */ 1628 if (rdev->constraints && 1629 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1630 drms_uA_update(rdev); 1631 1632 if (rdev->use_count == 0) { 1633 /* The regulator may on if it's not switchable or left on */ 1634 ret = _regulator_is_enabled(rdev); 1635 if (ret == -EINVAL || ret == 0) { 1636 if (!_regulator_can_change_status(rdev)) 1637 return -EPERM; 1638 1639 ret = _regulator_do_enable(rdev); 1640 if (ret < 0) 1641 return ret; 1642 1643 } else if (ret < 0) { 1644 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1645 return ret; 1646 } 1647 /* Fallthrough on positive return values - already enabled */ 1648 } 1649 1650 rdev->use_count++; 1651 1652 return 0; 1653} 1654 1655/** 1656 * regulator_enable - enable regulator output 1657 * @regulator: regulator source 1658 * 1659 * Request that the regulator be enabled with the regulator output at 1660 * the predefined voltage or current value. Calls to regulator_enable() 1661 * must be balanced with calls to regulator_disable(). 1662 * 1663 * NOTE: the output value can be set by other drivers, boot loader or may be 1664 * hardwired in the regulator. 1665 */ 1666int regulator_enable(struct regulator *regulator) 1667{ 1668 struct regulator_dev *rdev = regulator->rdev; 1669 int ret = 0; 1670 1671 if (regulator->always_on) 1672 return 0; 1673 1674 if (rdev->supply) { 1675 ret = regulator_enable(rdev->supply); 1676 if (ret != 0) 1677 return ret; 1678 } 1679 1680 mutex_lock(&rdev->mutex); 1681 ret = _regulator_enable(rdev); 1682 mutex_unlock(&rdev->mutex); 1683 1684 if (ret != 0 && rdev->supply) 1685 regulator_disable(rdev->supply); 1686 1687 return ret; 1688} 1689EXPORT_SYMBOL_GPL(regulator_enable); 1690 1691static int _regulator_do_disable(struct regulator_dev *rdev) 1692{ 1693 int ret; 1694 1695 trace_regulator_disable(rdev_get_name(rdev)); 1696 1697 if (rdev->ena_pin) { 1698 ret = regulator_ena_gpio_ctrl(rdev, false); 1699 if (ret < 0) 1700 return ret; 1701 rdev->ena_gpio_state = 0; 1702 1703 } else if (rdev->desc->ops->disable) { 1704 ret = rdev->desc->ops->disable(rdev); 1705 if (ret != 0) 1706 return ret; 1707 } 1708 1709 trace_regulator_disable_complete(rdev_get_name(rdev)); 1710 1711 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1712 NULL); 1713 return 0; 1714} 1715 1716/* locks held by regulator_disable() */ 1717static int _regulator_disable(struct regulator_dev *rdev) 1718{ 1719 int ret = 0; 1720 1721 if (WARN(rdev->use_count <= 0, 1722 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1723 return -EIO; 1724 1725 /* are we the last user and permitted to disable ? */ 1726 if (rdev->use_count == 1 && 1727 (rdev->constraints && !rdev->constraints->always_on)) { 1728 1729 /* we are last user */ 1730 if (_regulator_can_change_status(rdev)) { 1731 ret = _regulator_do_disable(rdev); 1732 if (ret < 0) { 1733 rdev_err(rdev, "failed to disable\n"); 1734 return ret; 1735 } 1736 } 1737 1738 rdev->use_count = 0; 1739 } else if (rdev->use_count > 1) { 1740 1741 if (rdev->constraints && 1742 (rdev->constraints->valid_ops_mask & 1743 REGULATOR_CHANGE_DRMS)) 1744 drms_uA_update(rdev); 1745 1746 rdev->use_count--; 1747 } 1748 1749 return ret; 1750} 1751 1752/** 1753 * regulator_disable - disable regulator output 1754 * @regulator: regulator source 1755 * 1756 * Disable the regulator output voltage or current. Calls to 1757 * regulator_enable() must be balanced with calls to 1758 * regulator_disable(). 1759 * 1760 * NOTE: this will only disable the regulator output if no other consumer 1761 * devices have it enabled, the regulator device supports disabling and 1762 * machine constraints permit this operation. 1763 */ 1764int regulator_disable(struct regulator *regulator) 1765{ 1766 struct regulator_dev *rdev = regulator->rdev; 1767 int ret = 0; 1768 1769 if (regulator->always_on) 1770 return 0; 1771 1772 mutex_lock(&rdev->mutex); 1773 ret = _regulator_disable(rdev); 1774 mutex_unlock(&rdev->mutex); 1775 1776 if (ret == 0 && rdev->supply) 1777 regulator_disable(rdev->supply); 1778 1779 return ret; 1780} 1781EXPORT_SYMBOL_GPL(regulator_disable); 1782 1783/* locks held by regulator_force_disable() */ 1784static int _regulator_force_disable(struct regulator_dev *rdev) 1785{ 1786 int ret = 0; 1787 1788 /* force disable */ 1789 if (rdev->desc->ops->disable) { 1790 /* ah well, who wants to live forever... */ 1791 ret = rdev->desc->ops->disable(rdev); 1792 if (ret < 0) { 1793 rdev_err(rdev, "failed to force disable\n"); 1794 return ret; 1795 } 1796 /* notify other consumers that power has been forced off */ 1797 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1798 REGULATOR_EVENT_DISABLE, NULL); 1799 } 1800 1801 return ret; 1802} 1803 1804/** 1805 * regulator_force_disable - force disable regulator output 1806 * @regulator: regulator source 1807 * 1808 * Forcibly disable the regulator output voltage or current. 1809 * NOTE: this *will* disable the regulator output even if other consumer 1810 * devices have it enabled. This should be used for situations when device 1811 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1812 */ 1813int regulator_force_disable(struct regulator *regulator) 1814{ 1815 struct regulator_dev *rdev = regulator->rdev; 1816 int ret; 1817 1818 mutex_lock(&rdev->mutex); 1819 regulator->uA_load = 0; 1820 ret = _regulator_force_disable(regulator->rdev); 1821 mutex_unlock(&rdev->mutex); 1822 1823 if (rdev->supply) 1824 while (rdev->open_count--) 1825 regulator_disable(rdev->supply); 1826 1827 return ret; 1828} 1829EXPORT_SYMBOL_GPL(regulator_force_disable); 1830 1831static void regulator_disable_work(struct work_struct *work) 1832{ 1833 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1834 disable_work.work); 1835 int count, i, ret; 1836 1837 mutex_lock(&rdev->mutex); 1838 1839 BUG_ON(!rdev->deferred_disables); 1840 1841 count = rdev->deferred_disables; 1842 rdev->deferred_disables = 0; 1843 1844 for (i = 0; i < count; i++) { 1845 ret = _regulator_disable(rdev); 1846 if (ret != 0) 1847 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1848 } 1849 1850 mutex_unlock(&rdev->mutex); 1851 1852 if (rdev->supply) { 1853 for (i = 0; i < count; i++) { 1854 ret = regulator_disable(rdev->supply); 1855 if (ret != 0) { 1856 rdev_err(rdev, 1857 "Supply disable failed: %d\n", ret); 1858 } 1859 } 1860 } 1861} 1862 1863/** 1864 * regulator_disable_deferred - disable regulator output with delay 1865 * @regulator: regulator source 1866 * @ms: miliseconds until the regulator is disabled 1867 * 1868 * Execute regulator_disable() on the regulator after a delay. This 1869 * is intended for use with devices that require some time to quiesce. 1870 * 1871 * NOTE: this will only disable the regulator output if no other consumer 1872 * devices have it enabled, the regulator device supports disabling and 1873 * machine constraints permit this operation. 1874 */ 1875int regulator_disable_deferred(struct regulator *regulator, int ms) 1876{ 1877 struct regulator_dev *rdev = regulator->rdev; 1878 int ret; 1879 1880 if (regulator->always_on) 1881 return 0; 1882 1883 if (!ms) 1884 return regulator_disable(regulator); 1885 1886 mutex_lock(&rdev->mutex); 1887 rdev->deferred_disables++; 1888 mutex_unlock(&rdev->mutex); 1889 1890 ret = schedule_delayed_work(&rdev->disable_work, 1891 msecs_to_jiffies(ms)); 1892 if (ret < 0) 1893 return ret; 1894 else 1895 return 0; 1896} 1897EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1898 1899/** 1900 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1901 * 1902 * @rdev: regulator to operate on 1903 * 1904 * Regulators that use regmap for their register I/O can set the 1905 * enable_reg and enable_mask fields in their descriptor and then use 1906 * this as their is_enabled operation, saving some code. 1907 */ 1908int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1909{ 1910 unsigned int val; 1911 int ret; 1912 1913 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1914 if (ret != 0) 1915 return ret; 1916 1917 if (rdev->desc->enable_is_inverted) 1918 return (val & rdev->desc->enable_mask) == 0; 1919 else 1920 return (val & rdev->desc->enable_mask) != 0; 1921} 1922EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1923 1924/** 1925 * regulator_enable_regmap - standard enable() for regmap users 1926 * 1927 * @rdev: regulator to operate on 1928 * 1929 * Regulators that use regmap for their register I/O can set the 1930 * enable_reg and enable_mask fields in their descriptor and then use 1931 * this as their enable() operation, saving some code. 1932 */ 1933int regulator_enable_regmap(struct regulator_dev *rdev) 1934{ 1935 unsigned int val; 1936 1937 if (rdev->desc->enable_is_inverted) 1938 val = 0; 1939 else 1940 val = rdev->desc->enable_mask; 1941 1942 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1943 rdev->desc->enable_mask, val); 1944} 1945EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1946 1947/** 1948 * regulator_disable_regmap - standard disable() for regmap users 1949 * 1950 * @rdev: regulator to operate on 1951 * 1952 * Regulators that use regmap for their register I/O can set the 1953 * enable_reg and enable_mask fields in their descriptor and then use 1954 * this as their disable() operation, saving some code. 1955 */ 1956int regulator_disable_regmap(struct regulator_dev *rdev) 1957{ 1958 unsigned int val; 1959 1960 if (rdev->desc->enable_is_inverted) 1961 val = rdev->desc->enable_mask; 1962 else 1963 val = 0; 1964 1965 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1966 rdev->desc->enable_mask, val); 1967} 1968EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1969 1970static int _regulator_is_enabled(struct regulator_dev *rdev) 1971{ 1972 /* A GPIO control always takes precedence */ 1973 if (rdev->ena_pin) 1974 return rdev->ena_gpio_state; 1975 1976 /* If we don't know then assume that the regulator is always on */ 1977 if (!rdev->desc->ops->is_enabled) 1978 return 1; 1979 1980 return rdev->desc->ops->is_enabled(rdev); 1981} 1982 1983/** 1984 * regulator_is_enabled - is the regulator output enabled 1985 * @regulator: regulator source 1986 * 1987 * Returns positive if the regulator driver backing the source/client 1988 * has requested that the device be enabled, zero if it hasn't, else a 1989 * negative errno code. 1990 * 1991 * Note that the device backing this regulator handle can have multiple 1992 * users, so it might be enabled even if regulator_enable() was never 1993 * called for this particular source. 1994 */ 1995int regulator_is_enabled(struct regulator *regulator) 1996{ 1997 int ret; 1998 1999 if (regulator->always_on) 2000 return 1; 2001 2002 mutex_lock(®ulator->rdev->mutex); 2003 ret = _regulator_is_enabled(regulator->rdev); 2004 mutex_unlock(®ulator->rdev->mutex); 2005 2006 return ret; 2007} 2008EXPORT_SYMBOL_GPL(regulator_is_enabled); 2009 2010/** 2011 * regulator_can_change_voltage - check if regulator can change voltage 2012 * @regulator: regulator source 2013 * 2014 * Returns positive if the regulator driver backing the source/client 2015 * can change its voltage, false otherwise. Usefull for detecting fixed 2016 * or dummy regulators and disabling voltage change logic in the client 2017 * driver. 2018 */ 2019int regulator_can_change_voltage(struct regulator *regulator) 2020{ 2021 struct regulator_dev *rdev = regulator->rdev; 2022 2023 if (rdev->constraints && 2024 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2025 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2026 return 1; 2027 2028 if (rdev->desc->continuous_voltage_range && 2029 rdev->constraints->min_uV && rdev->constraints->max_uV && 2030 rdev->constraints->min_uV != rdev->constraints->max_uV) 2031 return 1; 2032 } 2033 2034 return 0; 2035} 2036EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2037 2038/** 2039 * regulator_count_voltages - count regulator_list_voltage() selectors 2040 * @regulator: regulator source 2041 * 2042 * Returns number of selectors, or negative errno. Selectors are 2043 * numbered starting at zero, and typically correspond to bitfields 2044 * in hardware registers. 2045 */ 2046int regulator_count_voltages(struct regulator *regulator) 2047{ 2048 struct regulator_dev *rdev = regulator->rdev; 2049 2050 return rdev->desc->n_voltages ? : -EINVAL; 2051} 2052EXPORT_SYMBOL_GPL(regulator_count_voltages); 2053 2054/** 2055 * regulator_list_voltage_linear - List voltages with simple calculation 2056 * 2057 * @rdev: Regulator device 2058 * @selector: Selector to convert into a voltage 2059 * 2060 * Regulators with a simple linear mapping between voltages and 2061 * selectors can set min_uV and uV_step in the regulator descriptor 2062 * and then use this function as their list_voltage() operation, 2063 */ 2064int regulator_list_voltage_linear(struct regulator_dev *rdev, 2065 unsigned int selector) 2066{ 2067 if (selector >= rdev->desc->n_voltages) 2068 return -EINVAL; 2069 if (selector < rdev->desc->linear_min_sel) 2070 return 0; 2071 2072 selector -= rdev->desc->linear_min_sel; 2073 2074 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 2075} 2076EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 2077 2078/** 2079 * regulator_list_voltage_table - List voltages with table based mapping 2080 * 2081 * @rdev: Regulator device 2082 * @selector: Selector to convert into a voltage 2083 * 2084 * Regulators with table based mapping between voltages and 2085 * selectors can set volt_table in the regulator descriptor 2086 * and then use this function as their list_voltage() operation. 2087 */ 2088int regulator_list_voltage_table(struct regulator_dev *rdev, 2089 unsigned int selector) 2090{ 2091 if (!rdev->desc->volt_table) { 2092 BUG_ON(!rdev->desc->volt_table); 2093 return -EINVAL; 2094 } 2095 2096 if (selector >= rdev->desc->n_voltages) 2097 return -EINVAL; 2098 2099 return rdev->desc->volt_table[selector]; 2100} 2101EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 2102 2103/** 2104 * regulator_list_voltage - enumerate supported voltages 2105 * @regulator: regulator source 2106 * @selector: identify voltage to list 2107 * Context: can sleep 2108 * 2109 * Returns a voltage that can be passed to @regulator_set_voltage(), 2110 * zero if this selector code can't be used on this system, or a 2111 * negative errno. 2112 */ 2113int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2114{ 2115 struct regulator_dev *rdev = regulator->rdev; 2116 struct regulator_ops *ops = rdev->desc->ops; 2117 int ret; 2118 2119 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2120 return -EINVAL; 2121 2122 mutex_lock(&rdev->mutex); 2123 ret = ops->list_voltage(rdev, selector); 2124 mutex_unlock(&rdev->mutex); 2125 2126 if (ret > 0) { 2127 if (ret < rdev->constraints->min_uV) 2128 ret = 0; 2129 else if (ret > rdev->constraints->max_uV) 2130 ret = 0; 2131 } 2132 2133 return ret; 2134} 2135EXPORT_SYMBOL_GPL(regulator_list_voltage); 2136 2137/** 2138 * regulator_get_linear_step - return the voltage step size between VSEL values 2139 * @regulator: regulator source 2140 * 2141 * Returns the voltage step size between VSEL values for linear 2142 * regulators, or return 0 if the regulator isn't a linear regulator. 2143 */ 2144unsigned int regulator_get_linear_step(struct regulator *regulator) 2145{ 2146 struct regulator_dev *rdev = regulator->rdev; 2147 2148 return rdev->desc->uV_step; 2149} 2150EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2151 2152/** 2153 * regulator_is_supported_voltage - check if a voltage range can be supported 2154 * 2155 * @regulator: Regulator to check. 2156 * @min_uV: Minimum required voltage in uV. 2157 * @max_uV: Maximum required voltage in uV. 2158 * 2159 * Returns a boolean or a negative error code. 2160 */ 2161int regulator_is_supported_voltage(struct regulator *regulator, 2162 int min_uV, int max_uV) 2163{ 2164 struct regulator_dev *rdev = regulator->rdev; 2165 int i, voltages, ret; 2166 2167 /* If we can't change voltage check the current voltage */ 2168 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2169 ret = regulator_get_voltage(regulator); 2170 if (ret >= 0) 2171 return (min_uV <= ret && ret <= max_uV); 2172 else 2173 return ret; 2174 } 2175 2176 /* Any voltage within constrains range is fine? */ 2177 if (rdev->desc->continuous_voltage_range) 2178 return min_uV >= rdev->constraints->min_uV && 2179 max_uV <= rdev->constraints->max_uV; 2180 2181 ret = regulator_count_voltages(regulator); 2182 if (ret < 0) 2183 return ret; 2184 voltages = ret; 2185 2186 for (i = 0; i < voltages; i++) { 2187 ret = regulator_list_voltage(regulator, i); 2188 2189 if (ret >= min_uV && ret <= max_uV) 2190 return 1; 2191 } 2192 2193 return 0; 2194} 2195EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2196 2197/** 2198 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2199 * 2200 * @rdev: regulator to operate on 2201 * 2202 * Regulators that use regmap for their register I/O can set the 2203 * vsel_reg and vsel_mask fields in their descriptor and then use this 2204 * as their get_voltage_vsel operation, saving some code. 2205 */ 2206int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2207{ 2208 unsigned int val; 2209 int ret; 2210 2211 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2212 if (ret != 0) 2213 return ret; 2214 2215 val &= rdev->desc->vsel_mask; 2216 val >>= ffs(rdev->desc->vsel_mask) - 1; 2217 2218 return val; 2219} 2220EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2221 2222/** 2223 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2224 * 2225 * @rdev: regulator to operate on 2226 * @sel: Selector to set 2227 * 2228 * Regulators that use regmap for their register I/O can set the 2229 * vsel_reg and vsel_mask fields in their descriptor and then use this 2230 * as their set_voltage_vsel operation, saving some code. 2231 */ 2232int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2233{ 2234 int ret; 2235 2236 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2237 2238 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2239 rdev->desc->vsel_mask, sel); 2240 if (ret) 2241 return ret; 2242 2243 if (rdev->desc->apply_bit) 2244 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, 2245 rdev->desc->apply_bit, 2246 rdev->desc->apply_bit); 2247 return ret; 2248} 2249EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2250 2251/** 2252 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2253 * 2254 * @rdev: Regulator to operate on 2255 * @min_uV: Lower bound for voltage 2256 * @max_uV: Upper bound for voltage 2257 * 2258 * Drivers implementing set_voltage_sel() and list_voltage() can use 2259 * this as their map_voltage() operation. It will find a suitable 2260 * voltage by calling list_voltage() until it gets something in bounds 2261 * for the requested voltages. 2262 */ 2263int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2264 int min_uV, int max_uV) 2265{ 2266 int best_val = INT_MAX; 2267 int selector = 0; 2268 int i, ret; 2269 2270 /* Find the smallest voltage that falls within the specified 2271 * range. 2272 */ 2273 for (i = 0; i < rdev->desc->n_voltages; i++) { 2274 ret = rdev->desc->ops->list_voltage(rdev, i); 2275 if (ret < 0) 2276 continue; 2277 2278 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2279 best_val = ret; 2280 selector = i; 2281 } 2282 } 2283 2284 if (best_val != INT_MAX) 2285 return selector; 2286 else 2287 return -EINVAL; 2288} 2289EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2290 2291/** 2292 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list 2293 * 2294 * @rdev: Regulator to operate on 2295 * @min_uV: Lower bound for voltage 2296 * @max_uV: Upper bound for voltage 2297 * 2298 * Drivers that have ascendant voltage list can use this as their 2299 * map_voltage() operation. 2300 */ 2301int regulator_map_voltage_ascend(struct regulator_dev *rdev, 2302 int min_uV, int max_uV) 2303{ 2304 int i, ret; 2305 2306 for (i = 0; i < rdev->desc->n_voltages; i++) { 2307 ret = rdev->desc->ops->list_voltage(rdev, i); 2308 if (ret < 0) 2309 continue; 2310 2311 if (ret > max_uV) 2312 break; 2313 2314 if (ret >= min_uV && ret <= max_uV) 2315 return i; 2316 } 2317 2318 return -EINVAL; 2319} 2320EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend); 2321 2322/** 2323 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2324 * 2325 * @rdev: Regulator to operate on 2326 * @min_uV: Lower bound for voltage 2327 * @max_uV: Upper bound for voltage 2328 * 2329 * Drivers providing min_uV and uV_step in their regulator_desc can 2330 * use this as their map_voltage() operation. 2331 */ 2332int regulator_map_voltage_linear(struct regulator_dev *rdev, 2333 int min_uV, int max_uV) 2334{ 2335 int ret, voltage; 2336 2337 /* Allow uV_step to be 0 for fixed voltage */ 2338 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2339 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2340 return 0; 2341 else 2342 return -EINVAL; 2343 } 2344 2345 if (!rdev->desc->uV_step) { 2346 BUG_ON(!rdev->desc->uV_step); 2347 return -EINVAL; 2348 } 2349 2350 if (min_uV < rdev->desc->min_uV) 2351 min_uV = rdev->desc->min_uV; 2352 2353 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2354 if (ret < 0) 2355 return ret; 2356 2357 ret += rdev->desc->linear_min_sel; 2358 2359 /* Map back into a voltage to verify we're still in bounds */ 2360 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2361 if (voltage < min_uV || voltage > max_uV) 2362 return -EINVAL; 2363 2364 return ret; 2365} 2366EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2367 2368static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2369 int min_uV, int max_uV) 2370{ 2371 int ret; 2372 int delay = 0; 2373 int best_val = 0; 2374 unsigned int selector; 2375 int old_selector = -1; 2376 2377 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2378 2379 min_uV += rdev->constraints->uV_offset; 2380 max_uV += rdev->constraints->uV_offset; 2381 2382 /* 2383 * If we can't obtain the old selector there is not enough 2384 * info to call set_voltage_time_sel(). 2385 */ 2386 if (_regulator_is_enabled(rdev) && 2387 rdev->desc->ops->set_voltage_time_sel && 2388 rdev->desc->ops->get_voltage_sel) { 2389 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2390 if (old_selector < 0) 2391 return old_selector; 2392 } 2393 2394 if (rdev->desc->ops->set_voltage) { 2395 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2396 &selector); 2397 2398 if (ret >= 0) { 2399 if (rdev->desc->ops->list_voltage) 2400 best_val = rdev->desc->ops->list_voltage(rdev, 2401 selector); 2402 else 2403 best_val = _regulator_get_voltage(rdev); 2404 } 2405 2406 } else if (rdev->desc->ops->set_voltage_sel) { 2407 if (rdev->desc->ops->map_voltage) { 2408 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2409 max_uV); 2410 } else { 2411 if (rdev->desc->ops->list_voltage == 2412 regulator_list_voltage_linear) 2413 ret = regulator_map_voltage_linear(rdev, 2414 min_uV, max_uV); 2415 else 2416 ret = regulator_map_voltage_iterate(rdev, 2417 min_uV, max_uV); 2418 } 2419 2420 if (ret >= 0) { 2421 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2422 if (min_uV <= best_val && max_uV >= best_val) { 2423 selector = ret; 2424 if (old_selector == selector) 2425 ret = 0; 2426 else 2427 ret = rdev->desc->ops->set_voltage_sel( 2428 rdev, ret); 2429 } else { 2430 ret = -EINVAL; 2431 } 2432 } 2433 } else { 2434 ret = -EINVAL; 2435 } 2436 2437 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2438 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2439 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { 2440 2441 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2442 old_selector, selector); 2443 if (delay < 0) { 2444 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2445 delay); 2446 delay = 0; 2447 } 2448 2449 /* Insert any necessary delays */ 2450 if (delay >= 1000) { 2451 mdelay(delay / 1000); 2452 udelay(delay % 1000); 2453 } else if (delay) { 2454 udelay(delay); 2455 } 2456 } 2457 2458 if (ret == 0 && best_val >= 0) { 2459 unsigned long data = best_val; 2460 2461 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2462 (void *)data); 2463 } 2464 2465 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2466 2467 return ret; 2468} 2469 2470/** 2471 * regulator_set_voltage - set regulator output voltage 2472 * @regulator: regulator source 2473 * @min_uV: Minimum required voltage in uV 2474 * @max_uV: Maximum acceptable voltage in uV 2475 * 2476 * Sets a voltage regulator to the desired output voltage. This can be set 2477 * during any regulator state. IOW, regulator can be disabled or enabled. 2478 * 2479 * If the regulator is enabled then the voltage will change to the new value 2480 * immediately otherwise if the regulator is disabled the regulator will 2481 * output at the new voltage when enabled. 2482 * 2483 * NOTE: If the regulator is shared between several devices then the lowest 2484 * request voltage that meets the system constraints will be used. 2485 * Regulator system constraints must be set for this regulator before 2486 * calling this function otherwise this call will fail. 2487 */ 2488int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2489{ 2490 struct regulator_dev *rdev = regulator->rdev; 2491 int ret = 0; 2492 int old_min_uV, old_max_uV; 2493 2494 mutex_lock(&rdev->mutex); 2495 2496 /* If we're setting the same range as last time the change 2497 * should be a noop (some cpufreq implementations use the same 2498 * voltage for multiple frequencies, for example). 2499 */ 2500 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2501 goto out; 2502 2503 /* sanity check */ 2504 if (!rdev->desc->ops->set_voltage && 2505 !rdev->desc->ops->set_voltage_sel) { 2506 ret = -EINVAL; 2507 goto out; 2508 } 2509 2510 /* constraints check */ 2511 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2512 if (ret < 0) 2513 goto out; 2514 2515 /* restore original values in case of error */ 2516 old_min_uV = regulator->min_uV; 2517 old_max_uV = regulator->max_uV; 2518 regulator->min_uV = min_uV; 2519 regulator->max_uV = max_uV; 2520 2521 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2522 if (ret < 0) 2523 goto out2; 2524 2525 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2526 if (ret < 0) 2527 goto out2; 2528 2529out: 2530 mutex_unlock(&rdev->mutex); 2531 return ret; 2532out2: 2533 regulator->min_uV = old_min_uV; 2534 regulator->max_uV = old_max_uV; 2535 mutex_unlock(&rdev->mutex); 2536 return ret; 2537} 2538EXPORT_SYMBOL_GPL(regulator_set_voltage); 2539 2540/** 2541 * regulator_set_voltage_time - get raise/fall time 2542 * @regulator: regulator source 2543 * @old_uV: starting voltage in microvolts 2544 * @new_uV: target voltage in microvolts 2545 * 2546 * Provided with the starting and ending voltage, this function attempts to 2547 * calculate the time in microseconds required to rise or fall to this new 2548 * voltage. 2549 */ 2550int regulator_set_voltage_time(struct regulator *regulator, 2551 int old_uV, int new_uV) 2552{ 2553 struct regulator_dev *rdev = regulator->rdev; 2554 struct regulator_ops *ops = rdev->desc->ops; 2555 int old_sel = -1; 2556 int new_sel = -1; 2557 int voltage; 2558 int i; 2559 2560 /* Currently requires operations to do this */ 2561 if (!ops->list_voltage || !ops->set_voltage_time_sel 2562 || !rdev->desc->n_voltages) 2563 return -EINVAL; 2564 2565 for (i = 0; i < rdev->desc->n_voltages; i++) { 2566 /* We only look for exact voltage matches here */ 2567 voltage = regulator_list_voltage(regulator, i); 2568 if (voltage < 0) 2569 return -EINVAL; 2570 if (voltage == 0) 2571 continue; 2572 if (voltage == old_uV) 2573 old_sel = i; 2574 if (voltage == new_uV) 2575 new_sel = i; 2576 } 2577 2578 if (old_sel < 0 || new_sel < 0) 2579 return -EINVAL; 2580 2581 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2582} 2583EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2584 2585/** 2586 * regulator_set_voltage_time_sel - get raise/fall time 2587 * @rdev: regulator source device 2588 * @old_selector: selector for starting voltage 2589 * @new_selector: selector for target voltage 2590 * 2591 * Provided with the starting and target voltage selectors, this function 2592 * returns time in microseconds required to rise or fall to this new voltage 2593 * 2594 * Drivers providing ramp_delay in regulation_constraints can use this as their 2595 * set_voltage_time_sel() operation. 2596 */ 2597int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2598 unsigned int old_selector, 2599 unsigned int new_selector) 2600{ 2601 unsigned int ramp_delay = 0; 2602 int old_volt, new_volt; 2603 2604 if (rdev->constraints->ramp_delay) 2605 ramp_delay = rdev->constraints->ramp_delay; 2606 else if (rdev->desc->ramp_delay) 2607 ramp_delay = rdev->desc->ramp_delay; 2608 2609 if (ramp_delay == 0) { 2610 rdev_warn(rdev, "ramp_delay not set\n"); 2611 return 0; 2612 } 2613 2614 /* sanity check */ 2615 if (!rdev->desc->ops->list_voltage) 2616 return -EINVAL; 2617 2618 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2619 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2620 2621 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2622} 2623EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2624 2625/** 2626 * regulator_sync_voltage - re-apply last regulator output voltage 2627 * @regulator: regulator source 2628 * 2629 * Re-apply the last configured voltage. This is intended to be used 2630 * where some external control source the consumer is cooperating with 2631 * has caused the configured voltage to change. 2632 */ 2633int regulator_sync_voltage(struct regulator *regulator) 2634{ 2635 struct regulator_dev *rdev = regulator->rdev; 2636 int ret, min_uV, max_uV; 2637 2638 mutex_lock(&rdev->mutex); 2639 2640 if (!rdev->desc->ops->set_voltage && 2641 !rdev->desc->ops->set_voltage_sel) { 2642 ret = -EINVAL; 2643 goto out; 2644 } 2645 2646 /* This is only going to work if we've had a voltage configured. */ 2647 if (!regulator->min_uV && !regulator->max_uV) { 2648 ret = -EINVAL; 2649 goto out; 2650 } 2651 2652 min_uV = regulator->min_uV; 2653 max_uV = regulator->max_uV; 2654 2655 /* This should be a paranoia check... */ 2656 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2657 if (ret < 0) 2658 goto out; 2659 2660 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2661 if (ret < 0) 2662 goto out; 2663 2664 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2665 2666out: 2667 mutex_unlock(&rdev->mutex); 2668 return ret; 2669} 2670EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2671 2672static int _regulator_get_voltage(struct regulator_dev *rdev) 2673{ 2674 int sel, ret; 2675 2676 if (rdev->desc->ops->get_voltage_sel) { 2677 sel = rdev->desc->ops->get_voltage_sel(rdev); 2678 if (sel < 0) 2679 return sel; 2680 ret = rdev->desc->ops->list_voltage(rdev, sel); 2681 } else if (rdev->desc->ops->get_voltage) { 2682 ret = rdev->desc->ops->get_voltage(rdev); 2683 } else if (rdev->desc->ops->list_voltage) { 2684 ret = rdev->desc->ops->list_voltage(rdev, 0); 2685 } else { 2686 return -EINVAL; 2687 } 2688 2689 if (ret < 0) 2690 return ret; 2691 return ret - rdev->constraints->uV_offset; 2692} 2693 2694/** 2695 * regulator_get_voltage - get regulator output voltage 2696 * @regulator: regulator source 2697 * 2698 * This returns the current regulator voltage in uV. 2699 * 2700 * NOTE: If the regulator is disabled it will return the voltage value. This 2701 * function should not be used to determine regulator state. 2702 */ 2703int regulator_get_voltage(struct regulator *regulator) 2704{ 2705 int ret; 2706 2707 mutex_lock(®ulator->rdev->mutex); 2708 2709 ret = _regulator_get_voltage(regulator->rdev); 2710 2711 mutex_unlock(®ulator->rdev->mutex); 2712 2713 return ret; 2714} 2715EXPORT_SYMBOL_GPL(regulator_get_voltage); 2716 2717/** 2718 * regulator_set_current_limit - set regulator output current limit 2719 * @regulator: regulator source 2720 * @min_uA: Minimuum supported current in uA 2721 * @max_uA: Maximum supported current in uA 2722 * 2723 * Sets current sink to the desired output current. This can be set during 2724 * any regulator state. IOW, regulator can be disabled or enabled. 2725 * 2726 * If the regulator is enabled then the current will change to the new value 2727 * immediately otherwise if the regulator is disabled the regulator will 2728 * output at the new current when enabled. 2729 * 2730 * NOTE: Regulator system constraints must be set for this regulator before 2731 * calling this function otherwise this call will fail. 2732 */ 2733int regulator_set_current_limit(struct regulator *regulator, 2734 int min_uA, int max_uA) 2735{ 2736 struct regulator_dev *rdev = regulator->rdev; 2737 int ret; 2738 2739 mutex_lock(&rdev->mutex); 2740 2741 /* sanity check */ 2742 if (!rdev->desc->ops->set_current_limit) { 2743 ret = -EINVAL; 2744 goto out; 2745 } 2746 2747 /* constraints check */ 2748 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2749 if (ret < 0) 2750 goto out; 2751 2752 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2753out: 2754 mutex_unlock(&rdev->mutex); 2755 return ret; 2756} 2757EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2758 2759static int _regulator_get_current_limit(struct regulator_dev *rdev) 2760{ 2761 int ret; 2762 2763 mutex_lock(&rdev->mutex); 2764 2765 /* sanity check */ 2766 if (!rdev->desc->ops->get_current_limit) { 2767 ret = -EINVAL; 2768 goto out; 2769 } 2770 2771 ret = rdev->desc->ops->get_current_limit(rdev); 2772out: 2773 mutex_unlock(&rdev->mutex); 2774 return ret; 2775} 2776 2777/** 2778 * regulator_get_current_limit - get regulator output current 2779 * @regulator: regulator source 2780 * 2781 * This returns the current supplied by the specified current sink in uA. 2782 * 2783 * NOTE: If the regulator is disabled it will return the current value. This 2784 * function should not be used to determine regulator state. 2785 */ 2786int regulator_get_current_limit(struct regulator *regulator) 2787{ 2788 return _regulator_get_current_limit(regulator->rdev); 2789} 2790EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2791 2792/** 2793 * regulator_set_mode - set regulator operating mode 2794 * @regulator: regulator source 2795 * @mode: operating mode - one of the REGULATOR_MODE constants 2796 * 2797 * Set regulator operating mode to increase regulator efficiency or improve 2798 * regulation performance. 2799 * 2800 * NOTE: Regulator system constraints must be set for this regulator before 2801 * calling this function otherwise this call will fail. 2802 */ 2803int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2804{ 2805 struct regulator_dev *rdev = regulator->rdev; 2806 int ret; 2807 int regulator_curr_mode; 2808 2809 mutex_lock(&rdev->mutex); 2810 2811 /* sanity check */ 2812 if (!rdev->desc->ops->set_mode) { 2813 ret = -EINVAL; 2814 goto out; 2815 } 2816 2817 /* return if the same mode is requested */ 2818 if (rdev->desc->ops->get_mode) { 2819 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2820 if (regulator_curr_mode == mode) { 2821 ret = 0; 2822 goto out; 2823 } 2824 } 2825 2826 /* constraints check */ 2827 ret = regulator_mode_constrain(rdev, &mode); 2828 if (ret < 0) 2829 goto out; 2830 2831 ret = rdev->desc->ops->set_mode(rdev, mode); 2832out: 2833 mutex_unlock(&rdev->mutex); 2834 return ret; 2835} 2836EXPORT_SYMBOL_GPL(regulator_set_mode); 2837 2838static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2839{ 2840 int ret; 2841 2842 mutex_lock(&rdev->mutex); 2843 2844 /* sanity check */ 2845 if (!rdev->desc->ops->get_mode) { 2846 ret = -EINVAL; 2847 goto out; 2848 } 2849 2850 ret = rdev->desc->ops->get_mode(rdev); 2851out: 2852 mutex_unlock(&rdev->mutex); 2853 return ret; 2854} 2855 2856/** 2857 * regulator_get_mode - get regulator operating mode 2858 * @regulator: regulator source 2859 * 2860 * Get the current regulator operating mode. 2861 */ 2862unsigned int regulator_get_mode(struct regulator *regulator) 2863{ 2864 return _regulator_get_mode(regulator->rdev); 2865} 2866EXPORT_SYMBOL_GPL(regulator_get_mode); 2867 2868/** 2869 * regulator_set_optimum_mode - set regulator optimum operating mode 2870 * @regulator: regulator source 2871 * @uA_load: load current 2872 * 2873 * Notifies the regulator core of a new device load. This is then used by 2874 * DRMS (if enabled by constraints) to set the most efficient regulator 2875 * operating mode for the new regulator loading. 2876 * 2877 * Consumer devices notify their supply regulator of the maximum power 2878 * they will require (can be taken from device datasheet in the power 2879 * consumption tables) when they change operational status and hence power 2880 * state. Examples of operational state changes that can affect power 2881 * consumption are :- 2882 * 2883 * o Device is opened / closed. 2884 * o Device I/O is about to begin or has just finished. 2885 * o Device is idling in between work. 2886 * 2887 * This information is also exported via sysfs to userspace. 2888 * 2889 * DRMS will sum the total requested load on the regulator and change 2890 * to the most efficient operating mode if platform constraints allow. 2891 * 2892 * Returns the new regulator mode or error. 2893 */ 2894int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2895{ 2896 struct regulator_dev *rdev = regulator->rdev; 2897 struct regulator *consumer; 2898 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2899 unsigned int mode; 2900 2901 if (rdev->supply) 2902 input_uV = regulator_get_voltage(rdev->supply); 2903 2904 mutex_lock(&rdev->mutex); 2905 2906 /* 2907 * first check to see if we can set modes at all, otherwise just 2908 * tell the consumer everything is OK. 2909 */ 2910 regulator->uA_load = uA_load; 2911 ret = regulator_check_drms(rdev); 2912 if (ret < 0) { 2913 ret = 0; 2914 goto out; 2915 } 2916 2917 if (!rdev->desc->ops->get_optimum_mode) 2918 goto out; 2919 2920 /* 2921 * we can actually do this so any errors are indicators of 2922 * potential real failure. 2923 */ 2924 ret = -EINVAL; 2925 2926 if (!rdev->desc->ops->set_mode) 2927 goto out; 2928 2929 /* get output voltage */ 2930 output_uV = _regulator_get_voltage(rdev); 2931 if (output_uV <= 0) { 2932 rdev_err(rdev, "invalid output voltage found\n"); 2933 goto out; 2934 } 2935 2936 /* No supply? Use constraint voltage */ 2937 if (input_uV <= 0) 2938 input_uV = rdev->constraints->input_uV; 2939 if (input_uV <= 0) { 2940 rdev_err(rdev, "invalid input voltage found\n"); 2941 goto out; 2942 } 2943 2944 /* calc total requested load for this regulator */ 2945 list_for_each_entry(consumer, &rdev->consumer_list, list) 2946 total_uA_load += consumer->uA_load; 2947 2948 mode = rdev->desc->ops->get_optimum_mode(rdev, 2949 input_uV, output_uV, 2950 total_uA_load); 2951 ret = regulator_mode_constrain(rdev, &mode); 2952 if (ret < 0) { 2953 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2954 total_uA_load, input_uV, output_uV); 2955 goto out; 2956 } 2957 2958 ret = rdev->desc->ops->set_mode(rdev, mode); 2959 if (ret < 0) { 2960 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2961 goto out; 2962 } 2963 ret = mode; 2964out: 2965 mutex_unlock(&rdev->mutex); 2966 return ret; 2967} 2968EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2969 2970/** 2971 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2972 * 2973 * @rdev: device to operate on. 2974 * @enable: state to set. 2975 */ 2976int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2977{ 2978 unsigned int val; 2979 2980 if (enable) 2981 val = rdev->desc->bypass_mask; 2982 else 2983 val = 0; 2984 2985 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2986 rdev->desc->bypass_mask, val); 2987} 2988EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2989 2990/** 2991 * regulator_get_bypass_regmap - Default get_bypass() using regmap 2992 * 2993 * @rdev: device to operate on. 2994 * @enable: current state. 2995 */ 2996int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 2997{ 2998 unsigned int val; 2999 int ret; 3000 3001 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 3002 if (ret != 0) 3003 return ret; 3004 3005 *enable = val & rdev->desc->bypass_mask; 3006 3007 return 0; 3008} 3009EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 3010 3011/** 3012 * regulator_allow_bypass - allow the regulator to go into bypass mode 3013 * 3014 * @regulator: Regulator to configure 3015 * @enable: enable or disable bypass mode 3016 * 3017 * Allow the regulator to go into bypass mode if all other consumers 3018 * for the regulator also enable bypass mode and the machine 3019 * constraints allow this. Bypass mode means that the regulator is 3020 * simply passing the input directly to the output with no regulation. 3021 */ 3022int regulator_allow_bypass(struct regulator *regulator, bool enable) 3023{ 3024 struct regulator_dev *rdev = regulator->rdev; 3025 int ret = 0; 3026 3027 if (!rdev->desc->ops->set_bypass) 3028 return 0; 3029 3030 if (rdev->constraints && 3031 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 3032 return 0; 3033 3034 mutex_lock(&rdev->mutex); 3035 3036 if (enable && !regulator->bypass) { 3037 rdev->bypass_count++; 3038 3039 if (rdev->bypass_count == rdev->open_count) { 3040 ret = rdev->desc->ops->set_bypass(rdev, enable); 3041 if (ret != 0) 3042 rdev->bypass_count--; 3043 } 3044 3045 } else if (!enable && regulator->bypass) { 3046 rdev->bypass_count--; 3047 3048 if (rdev->bypass_count != rdev->open_count) { 3049 ret = rdev->desc->ops->set_bypass(rdev, enable); 3050 if (ret != 0) 3051 rdev->bypass_count++; 3052 } 3053 } 3054 3055 if (ret == 0) 3056 regulator->bypass = enable; 3057 3058 mutex_unlock(&rdev->mutex); 3059 3060 return ret; 3061} 3062EXPORT_SYMBOL_GPL(regulator_allow_bypass); 3063 3064/** 3065 * regulator_register_notifier - register regulator event notifier 3066 * @regulator: regulator source 3067 * @nb: notifier block 3068 * 3069 * Register notifier block to receive regulator events. 3070 */ 3071int regulator_register_notifier(struct regulator *regulator, 3072 struct notifier_block *nb) 3073{ 3074 return blocking_notifier_chain_register(®ulator->rdev->notifier, 3075 nb); 3076} 3077EXPORT_SYMBOL_GPL(regulator_register_notifier); 3078 3079/** 3080 * regulator_unregister_notifier - unregister regulator event notifier 3081 * @regulator: regulator source 3082 * @nb: notifier block 3083 * 3084 * Unregister regulator event notifier block. 3085 */ 3086int regulator_unregister_notifier(struct regulator *regulator, 3087 struct notifier_block *nb) 3088{ 3089 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 3090 nb); 3091} 3092EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 3093 3094/* notify regulator consumers and downstream regulator consumers. 3095 * Note mutex must be held by caller. 3096 */ 3097static void _notifier_call_chain(struct regulator_dev *rdev, 3098 unsigned long event, void *data) 3099{ 3100 /* call rdev chain first */ 3101 blocking_notifier_call_chain(&rdev->notifier, event, data); 3102} 3103 3104/** 3105 * regulator_bulk_get - get multiple regulator consumers 3106 * 3107 * @dev: Device to supply 3108 * @num_consumers: Number of consumers to register 3109 * @consumers: Configuration of consumers; clients are stored here. 3110 * 3111 * @return 0 on success, an errno on failure. 3112 * 3113 * This helper function allows drivers to get several regulator 3114 * consumers in one operation. If any of the regulators cannot be 3115 * acquired then any regulators that were allocated will be freed 3116 * before returning to the caller. 3117 */ 3118int regulator_bulk_get(struct device *dev, int num_consumers, 3119 struct regulator_bulk_data *consumers) 3120{ 3121 int i; 3122 int ret; 3123 3124 for (i = 0; i < num_consumers; i++) 3125 consumers[i].consumer = NULL; 3126 3127 for (i = 0; i < num_consumers; i++) { 3128 consumers[i].consumer = regulator_get(dev, 3129 consumers[i].supply); 3130 if (IS_ERR(consumers[i].consumer)) { 3131 ret = PTR_ERR(consumers[i].consumer); 3132 dev_err(dev, "Failed to get supply '%s': %d\n", 3133 consumers[i].supply, ret); 3134 consumers[i].consumer = NULL; 3135 goto err; 3136 } 3137 } 3138 3139 return 0; 3140 3141err: 3142 while (--i >= 0) 3143 regulator_put(consumers[i].consumer); 3144 3145 return ret; 3146} 3147EXPORT_SYMBOL_GPL(regulator_bulk_get); 3148 3149/** 3150 * devm_regulator_bulk_get - managed get multiple regulator consumers 3151 * 3152 * @dev: Device to supply 3153 * @num_consumers: Number of consumers to register 3154 * @consumers: Configuration of consumers; clients are stored here. 3155 * 3156 * @return 0 on success, an errno on failure. 3157 * 3158 * This helper function allows drivers to get several regulator 3159 * consumers in one operation with management, the regulators will 3160 * automatically be freed when the device is unbound. If any of the 3161 * regulators cannot be acquired then any regulators that were 3162 * allocated will be freed before returning to the caller. 3163 */ 3164int devm_regulator_bulk_get(struct device *dev, int num_consumers, 3165 struct regulator_bulk_data *consumers) 3166{ 3167 int i; 3168 int ret; 3169 3170 for (i = 0; i < num_consumers; i++) 3171 consumers[i].consumer = NULL; 3172 3173 for (i = 0; i < num_consumers; i++) { 3174 consumers[i].consumer = devm_regulator_get(dev, 3175 consumers[i].supply); 3176 if (IS_ERR(consumers[i].consumer)) { 3177 ret = PTR_ERR(consumers[i].consumer); 3178 dev_err(dev, "Failed to get supply '%s': %d\n", 3179 consumers[i].supply, ret); 3180 consumers[i].consumer = NULL; 3181 goto err; 3182 } 3183 } 3184 3185 return 0; 3186 3187err: 3188 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 3189 devm_regulator_put(consumers[i].consumer); 3190 3191 return ret; 3192} 3193EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 3194 3195static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3196{ 3197 struct regulator_bulk_data *bulk = data; 3198 3199 bulk->ret = regulator_enable(bulk->consumer); 3200} 3201 3202/** 3203 * regulator_bulk_enable - enable multiple regulator consumers 3204 * 3205 * @num_consumers: Number of consumers 3206 * @consumers: Consumer data; clients are stored here. 3207 * @return 0 on success, an errno on failure 3208 * 3209 * This convenience API allows consumers to enable multiple regulator 3210 * clients in a single API call. If any consumers cannot be enabled 3211 * then any others that were enabled will be disabled again prior to 3212 * return. 3213 */ 3214int regulator_bulk_enable(int num_consumers, 3215 struct regulator_bulk_data *consumers) 3216{ 3217 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3218 int i; 3219 int ret = 0; 3220 3221 for (i = 0; i < num_consumers; i++) { 3222 if (consumers[i].consumer->always_on) 3223 consumers[i].ret = 0; 3224 else 3225 async_schedule_domain(regulator_bulk_enable_async, 3226 &consumers[i], &async_domain); 3227 } 3228 3229 async_synchronize_full_domain(&async_domain); 3230 3231 /* If any consumer failed we need to unwind any that succeeded */ 3232 for (i = 0; i < num_consumers; i++) { 3233 if (consumers[i].ret != 0) { 3234 ret = consumers[i].ret; 3235 goto err; 3236 } 3237 } 3238 3239 return 0; 3240 3241err: 3242 for (i = 0; i < num_consumers; i++) { 3243 if (consumers[i].ret < 0) 3244 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3245 consumers[i].ret); 3246 else 3247 regulator_disable(consumers[i].consumer); 3248 } 3249 3250 return ret; 3251} 3252EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3253 3254/** 3255 * regulator_bulk_disable - disable multiple regulator consumers 3256 * 3257 * @num_consumers: Number of consumers 3258 * @consumers: Consumer data; clients are stored here. 3259 * @return 0 on success, an errno on failure 3260 * 3261 * This convenience API allows consumers to disable multiple regulator 3262 * clients in a single API call. If any consumers cannot be disabled 3263 * then any others that were disabled will be enabled again prior to 3264 * return. 3265 */ 3266int regulator_bulk_disable(int num_consumers, 3267 struct regulator_bulk_data *consumers) 3268{ 3269 int i; 3270 int ret, r; 3271 3272 for (i = num_consumers - 1; i >= 0; --i) { 3273 ret = regulator_disable(consumers[i].consumer); 3274 if (ret != 0) 3275 goto err; 3276 } 3277 3278 return 0; 3279 3280err: 3281 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3282 for (++i; i < num_consumers; ++i) { 3283 r = regulator_enable(consumers[i].consumer); 3284 if (r != 0) 3285 pr_err("Failed to reename %s: %d\n", 3286 consumers[i].supply, r); 3287 } 3288 3289 return ret; 3290} 3291EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3292 3293/** 3294 * regulator_bulk_force_disable - force disable multiple regulator consumers 3295 * 3296 * @num_consumers: Number of consumers 3297 * @consumers: Consumer data; clients are stored here. 3298 * @return 0 on success, an errno on failure 3299 * 3300 * This convenience API allows consumers to forcibly disable multiple regulator 3301 * clients in a single API call. 3302 * NOTE: This should be used for situations when device damage will 3303 * likely occur if the regulators are not disabled (e.g. over temp). 3304 * Although regulator_force_disable function call for some consumers can 3305 * return error numbers, the function is called for all consumers. 3306 */ 3307int regulator_bulk_force_disable(int num_consumers, 3308 struct regulator_bulk_data *consumers) 3309{ 3310 int i; 3311 int ret; 3312 3313 for (i = 0; i < num_consumers; i++) 3314 consumers[i].ret = 3315 regulator_force_disable(consumers[i].consumer); 3316 3317 for (i = 0; i < num_consumers; i++) { 3318 if (consumers[i].ret != 0) { 3319 ret = consumers[i].ret; 3320 goto out; 3321 } 3322 } 3323 3324 return 0; 3325out: 3326 return ret; 3327} 3328EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3329 3330/** 3331 * regulator_bulk_free - free multiple regulator consumers 3332 * 3333 * @num_consumers: Number of consumers 3334 * @consumers: Consumer data; clients are stored here. 3335 * 3336 * This convenience API allows consumers to free multiple regulator 3337 * clients in a single API call. 3338 */ 3339void regulator_bulk_free(int num_consumers, 3340 struct regulator_bulk_data *consumers) 3341{ 3342 int i; 3343 3344 for (i = 0; i < num_consumers; i++) { 3345 regulator_put(consumers[i].consumer); 3346 consumers[i].consumer = NULL; 3347 } 3348} 3349EXPORT_SYMBOL_GPL(regulator_bulk_free); 3350 3351/** 3352 * regulator_notifier_call_chain - call regulator event notifier 3353 * @rdev: regulator source 3354 * @event: notifier block 3355 * @data: callback-specific data. 3356 * 3357 * Called by regulator drivers to notify clients a regulator event has 3358 * occurred. We also notify regulator clients downstream. 3359 * Note lock must be held by caller. 3360 */ 3361int regulator_notifier_call_chain(struct regulator_dev *rdev, 3362 unsigned long event, void *data) 3363{ 3364 _notifier_call_chain(rdev, event, data); 3365 return NOTIFY_DONE; 3366 3367} 3368EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3369 3370/** 3371 * regulator_mode_to_status - convert a regulator mode into a status 3372 * 3373 * @mode: Mode to convert 3374 * 3375 * Convert a regulator mode into a status. 3376 */ 3377int regulator_mode_to_status(unsigned int mode) 3378{ 3379 switch (mode) { 3380 case REGULATOR_MODE_FAST: 3381 return REGULATOR_STATUS_FAST; 3382 case REGULATOR_MODE_NORMAL: 3383 return REGULATOR_STATUS_NORMAL; 3384 case REGULATOR_MODE_IDLE: 3385 return REGULATOR_STATUS_IDLE; 3386 case REGULATOR_MODE_STANDBY: 3387 return REGULATOR_STATUS_STANDBY; 3388 default: 3389 return REGULATOR_STATUS_UNDEFINED; 3390 } 3391} 3392EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3393 3394/* 3395 * To avoid cluttering sysfs (and memory) with useless state, only 3396 * create attributes that can be meaningfully displayed. 3397 */ 3398static int add_regulator_attributes(struct regulator_dev *rdev) 3399{ 3400 struct device *dev = &rdev->dev; 3401 struct regulator_ops *ops = rdev->desc->ops; 3402 int status = 0; 3403 3404 /* some attributes need specific methods to be displayed */ 3405 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3406 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3407 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3408 status = device_create_file(dev, &dev_attr_microvolts); 3409 if (status < 0) 3410 return status; 3411 } 3412 if (ops->get_current_limit) { 3413 status = device_create_file(dev, &dev_attr_microamps); 3414 if (status < 0) 3415 return status; 3416 } 3417 if (ops->get_mode) { 3418 status = device_create_file(dev, &dev_attr_opmode); 3419 if (status < 0) 3420 return status; 3421 } 3422 if (rdev->ena_pin || ops->is_enabled) { 3423 status = device_create_file(dev, &dev_attr_state); 3424 if (status < 0) 3425 return status; 3426 } 3427 if (ops->get_status) { 3428 status = device_create_file(dev, &dev_attr_status); 3429 if (status < 0) 3430 return status; 3431 } 3432 if (ops->get_bypass) { 3433 status = device_create_file(dev, &dev_attr_bypass); 3434 if (status < 0) 3435 return status; 3436 } 3437 3438 /* some attributes are type-specific */ 3439 if (rdev->desc->type == REGULATOR_CURRENT) { 3440 status = device_create_file(dev, &dev_attr_requested_microamps); 3441 if (status < 0) 3442 return status; 3443 } 3444 3445 /* all the other attributes exist to support constraints; 3446 * don't show them if there are no constraints, or if the 3447 * relevant supporting methods are missing. 3448 */ 3449 if (!rdev->constraints) 3450 return status; 3451 3452 /* constraints need specific supporting methods */ 3453 if (ops->set_voltage || ops->set_voltage_sel) { 3454 status = device_create_file(dev, &dev_attr_min_microvolts); 3455 if (status < 0) 3456 return status; 3457 status = device_create_file(dev, &dev_attr_max_microvolts); 3458 if (status < 0) 3459 return status; 3460 } 3461 if (ops->set_current_limit) { 3462 status = device_create_file(dev, &dev_attr_min_microamps); 3463 if (status < 0) 3464 return status; 3465 status = device_create_file(dev, &dev_attr_max_microamps); 3466 if (status < 0) 3467 return status; 3468 } 3469 3470 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3471 if (status < 0) 3472 return status; 3473 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3474 if (status < 0) 3475 return status; 3476 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3477 if (status < 0) 3478 return status; 3479 3480 if (ops->set_suspend_voltage) { 3481 status = device_create_file(dev, 3482 &dev_attr_suspend_standby_microvolts); 3483 if (status < 0) 3484 return status; 3485 status = device_create_file(dev, 3486 &dev_attr_suspend_mem_microvolts); 3487 if (status < 0) 3488 return status; 3489 status = device_create_file(dev, 3490 &dev_attr_suspend_disk_microvolts); 3491 if (status < 0) 3492 return status; 3493 } 3494 3495 if (ops->set_suspend_mode) { 3496 status = device_create_file(dev, 3497 &dev_attr_suspend_standby_mode); 3498 if (status < 0) 3499 return status; 3500 status = device_create_file(dev, 3501 &dev_attr_suspend_mem_mode); 3502 if (status < 0) 3503 return status; 3504 status = device_create_file(dev, 3505 &dev_attr_suspend_disk_mode); 3506 if (status < 0) 3507 return status; 3508 } 3509 3510 return status; 3511} 3512 3513static void rdev_init_debugfs(struct regulator_dev *rdev) 3514{ 3515 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3516 if (!rdev->debugfs) { 3517 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3518 return; 3519 } 3520 3521 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3522 &rdev->use_count); 3523 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3524 &rdev->open_count); 3525 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3526 &rdev->bypass_count); 3527} 3528 3529/** 3530 * regulator_register - register regulator 3531 * @regulator_desc: regulator to register 3532 * @config: runtime configuration for regulator 3533 * 3534 * Called by regulator drivers to register a regulator. 3535 * Returns a valid pointer to struct regulator_dev on success 3536 * or an ERR_PTR() on error. 3537 */ 3538struct regulator_dev * 3539regulator_register(const struct regulator_desc *regulator_desc, 3540 const struct regulator_config *config) 3541{ 3542 const struct regulation_constraints *constraints = NULL; 3543 const struct regulator_init_data *init_data; 3544 static atomic_t regulator_no = ATOMIC_INIT(0); 3545 struct regulator_dev *rdev; 3546 struct device *dev; 3547 int ret, i; 3548 const char *supply = NULL; 3549 3550 if (regulator_desc == NULL || config == NULL) 3551 return ERR_PTR(-EINVAL); 3552 3553 dev = config->dev; 3554 WARN_ON(!dev); 3555 3556 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3557 return ERR_PTR(-EINVAL); 3558 3559 if (regulator_desc->type != REGULATOR_VOLTAGE && 3560 regulator_desc->type != REGULATOR_CURRENT) 3561 return ERR_PTR(-EINVAL); 3562 3563 /* Only one of each should be implemented */ 3564 WARN_ON(regulator_desc->ops->get_voltage && 3565 regulator_desc->ops->get_voltage_sel); 3566 WARN_ON(regulator_desc->ops->set_voltage && 3567 regulator_desc->ops->set_voltage_sel); 3568 3569 /* If we're using selectors we must implement list_voltage. */ 3570 if (regulator_desc->ops->get_voltage_sel && 3571 !regulator_desc->ops->list_voltage) { 3572 return ERR_PTR(-EINVAL); 3573 } 3574 if (regulator_desc->ops->set_voltage_sel && 3575 !regulator_desc->ops->list_voltage) { 3576 return ERR_PTR(-EINVAL); 3577 } 3578 3579 init_data = config->init_data; 3580 3581 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3582 if (rdev == NULL) 3583 return ERR_PTR(-ENOMEM); 3584 3585 mutex_lock(®ulator_list_mutex); 3586 3587 mutex_init(&rdev->mutex); 3588 rdev->reg_data = config->driver_data; 3589 rdev->owner = regulator_desc->owner; 3590 rdev->desc = regulator_desc; 3591 if (config->regmap) 3592 rdev->regmap = config->regmap; 3593 else if (dev_get_regmap(dev, NULL)) 3594 rdev->regmap = dev_get_regmap(dev, NULL); 3595 else if (dev->parent) 3596 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3597 INIT_LIST_HEAD(&rdev->consumer_list); 3598 INIT_LIST_HEAD(&rdev->list); 3599 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3600 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3601 3602 /* preform any regulator specific init */ 3603 if (init_data && init_data->regulator_init) { 3604 ret = init_data->regulator_init(rdev->reg_data); 3605 if (ret < 0) 3606 goto clean; 3607 } 3608 3609 /* register with sysfs */ 3610 rdev->dev.class = ®ulator_class; 3611 rdev->dev.of_node = config->of_node; 3612 rdev->dev.parent = dev; 3613 dev_set_name(&rdev->dev, "regulator.%d", 3614 atomic_inc_return(®ulator_no) - 1); 3615 ret = device_register(&rdev->dev); 3616 if (ret != 0) { 3617 put_device(&rdev->dev); 3618 goto clean; 3619 } 3620 3621 dev_set_drvdata(&rdev->dev, rdev); 3622 3623 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3624 ret = regulator_ena_gpio_request(rdev, config); 3625 if (ret != 0) { 3626 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3627 config->ena_gpio, ret); 3628 goto wash; 3629 } 3630 3631 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3632 rdev->ena_gpio_state = 1; 3633 3634 if (config->ena_gpio_invert) 3635 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3636 } 3637 3638 /* set regulator constraints */ 3639 if (init_data) 3640 constraints = &init_data->constraints; 3641 3642 ret = set_machine_constraints(rdev, constraints); 3643 if (ret < 0) 3644 goto scrub; 3645 3646 /* add attributes supported by this regulator */ 3647 ret = add_regulator_attributes(rdev); 3648 if (ret < 0) 3649 goto scrub; 3650 3651 if (init_data && init_data->supply_regulator) 3652 supply = init_data->supply_regulator; 3653 else if (regulator_desc->supply_name) 3654 supply = regulator_desc->supply_name; 3655 3656 if (supply) { 3657 struct regulator_dev *r; 3658 3659 r = regulator_dev_lookup(dev, supply, &ret); 3660 3661 if (ret == -ENODEV) { 3662 /* 3663 * No supply was specified for this regulator and 3664 * there will never be one. 3665 */ 3666 ret = 0; 3667 goto add_dev; 3668 } else if (!r) { 3669 dev_err(dev, "Failed to find supply %s\n", supply); 3670 ret = -EPROBE_DEFER; 3671 goto scrub; 3672 } 3673 3674 ret = set_supply(rdev, r); 3675 if (ret < 0) 3676 goto scrub; 3677 3678 /* Enable supply if rail is enabled */ 3679 if (_regulator_is_enabled(rdev)) { 3680 ret = regulator_enable(rdev->supply); 3681 if (ret < 0) 3682 goto scrub; 3683 } 3684 } 3685 3686add_dev: 3687 /* add consumers devices */ 3688 if (init_data) { 3689 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3690 ret = set_consumer_device_supply(rdev, 3691 init_data->consumer_supplies[i].dev_name, 3692 init_data->consumer_supplies[i].supply); 3693 if (ret < 0) { 3694 dev_err(dev, "Failed to set supply %s\n", 3695 init_data->consumer_supplies[i].supply); 3696 goto unset_supplies; 3697 } 3698 } 3699 } 3700 3701 list_add(&rdev->list, ®ulator_list); 3702 3703 rdev_init_debugfs(rdev); 3704out: 3705 mutex_unlock(®ulator_list_mutex); 3706 return rdev; 3707 3708unset_supplies: 3709 unset_regulator_supplies(rdev); 3710 3711scrub: 3712 if (rdev->supply) 3713 _regulator_put(rdev->supply); 3714 regulator_ena_gpio_free(rdev); 3715 kfree(rdev->constraints); 3716wash: 3717 device_unregister(&rdev->dev); 3718 /* device core frees rdev */ 3719 rdev = ERR_PTR(ret); 3720 goto out; 3721 3722clean: 3723 kfree(rdev); 3724 rdev = ERR_PTR(ret); 3725 goto out; 3726} 3727EXPORT_SYMBOL_GPL(regulator_register); 3728 3729/** 3730 * regulator_unregister - unregister regulator 3731 * @rdev: regulator to unregister 3732 * 3733 * Called by regulator drivers to unregister a regulator. 3734 */ 3735void regulator_unregister(struct regulator_dev *rdev) 3736{ 3737 if (rdev == NULL) 3738 return; 3739 3740 if (rdev->supply) 3741 regulator_put(rdev->supply); 3742 mutex_lock(®ulator_list_mutex); 3743 debugfs_remove_recursive(rdev->debugfs); 3744 flush_work(&rdev->disable_work.work); 3745 WARN_ON(rdev->open_count); 3746 unset_regulator_supplies(rdev); 3747 list_del(&rdev->list); 3748 kfree(rdev->constraints); 3749 regulator_ena_gpio_free(rdev); 3750 device_unregister(&rdev->dev); 3751 mutex_unlock(®ulator_list_mutex); 3752} 3753EXPORT_SYMBOL_GPL(regulator_unregister); 3754 3755/** 3756 * regulator_suspend_prepare - prepare regulators for system wide suspend 3757 * @state: system suspend state 3758 * 3759 * Configure each regulator with it's suspend operating parameters for state. 3760 * This will usually be called by machine suspend code prior to supending. 3761 */ 3762int regulator_suspend_prepare(suspend_state_t state) 3763{ 3764 struct regulator_dev *rdev; 3765 int ret = 0; 3766 3767 /* ON is handled by regulator active state */ 3768 if (state == PM_SUSPEND_ON) 3769 return -EINVAL; 3770 3771 mutex_lock(®ulator_list_mutex); 3772 list_for_each_entry(rdev, ®ulator_list, list) { 3773 3774 mutex_lock(&rdev->mutex); 3775 ret = suspend_prepare(rdev, state); 3776 mutex_unlock(&rdev->mutex); 3777 3778 if (ret < 0) { 3779 rdev_err(rdev, "failed to prepare\n"); 3780 goto out; 3781 } 3782 } 3783out: 3784 mutex_unlock(®ulator_list_mutex); 3785 return ret; 3786} 3787EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3788 3789/** 3790 * regulator_suspend_finish - resume regulators from system wide suspend 3791 * 3792 * Turn on regulators that might be turned off by regulator_suspend_prepare 3793 * and that should be turned on according to the regulators properties. 3794 */ 3795int regulator_suspend_finish(void) 3796{ 3797 struct regulator_dev *rdev; 3798 int ret = 0, error; 3799 3800 mutex_lock(®ulator_list_mutex); 3801 list_for_each_entry(rdev, ®ulator_list, list) { 3802 struct regulator_ops *ops = rdev->desc->ops; 3803 3804 mutex_lock(&rdev->mutex); 3805 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3806 ops->enable) { 3807 error = ops->enable(rdev); 3808 if (error) 3809 ret = error; 3810 } else { 3811 if (!has_full_constraints) 3812 goto unlock; 3813 if (!ops->disable) 3814 goto unlock; 3815 if (!_regulator_is_enabled(rdev)) 3816 goto unlock; 3817 3818 error = ops->disable(rdev); 3819 if (error) 3820 ret = error; 3821 } 3822unlock: 3823 mutex_unlock(&rdev->mutex); 3824 } 3825 mutex_unlock(®ulator_list_mutex); 3826 return ret; 3827} 3828EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3829 3830/** 3831 * regulator_has_full_constraints - the system has fully specified constraints 3832 * 3833 * Calling this function will cause the regulator API to disable all 3834 * regulators which have a zero use count and don't have an always_on 3835 * constraint in a late_initcall. 3836 * 3837 * The intention is that this will become the default behaviour in a 3838 * future kernel release so users are encouraged to use this facility 3839 * now. 3840 */ 3841void regulator_has_full_constraints(void) 3842{ 3843 has_full_constraints = 1; 3844} 3845EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3846 3847/** 3848 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3849 * 3850 * Calling this function will cause the regulator API to provide a 3851 * dummy regulator to consumers if no physical regulator is found, 3852 * allowing most consumers to proceed as though a regulator were 3853 * configured. This allows systems such as those with software 3854 * controllable regulators for the CPU core only to be brought up more 3855 * readily. 3856 */ 3857void regulator_use_dummy_regulator(void) 3858{ 3859 board_wants_dummy_regulator = true; 3860} 3861EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3862 3863/** 3864 * rdev_get_drvdata - get rdev regulator driver data 3865 * @rdev: regulator 3866 * 3867 * Get rdev regulator driver private data. This call can be used in the 3868 * regulator driver context. 3869 */ 3870void *rdev_get_drvdata(struct regulator_dev *rdev) 3871{ 3872 return rdev->reg_data; 3873} 3874EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3875 3876/** 3877 * regulator_get_drvdata - get regulator driver data 3878 * @regulator: regulator 3879 * 3880 * Get regulator driver private data. This call can be used in the consumer 3881 * driver context when non API regulator specific functions need to be called. 3882 */ 3883void *regulator_get_drvdata(struct regulator *regulator) 3884{ 3885 return regulator->rdev->reg_data; 3886} 3887EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3888 3889/** 3890 * regulator_set_drvdata - set regulator driver data 3891 * @regulator: regulator 3892 * @data: data 3893 */ 3894void regulator_set_drvdata(struct regulator *regulator, void *data) 3895{ 3896 regulator->rdev->reg_data = data; 3897} 3898EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3899 3900/** 3901 * regulator_get_id - get regulator ID 3902 * @rdev: regulator 3903 */ 3904int rdev_get_id(struct regulator_dev *rdev) 3905{ 3906 return rdev->desc->id; 3907} 3908EXPORT_SYMBOL_GPL(rdev_get_id); 3909 3910struct device *rdev_get_dev(struct regulator_dev *rdev) 3911{ 3912 return &rdev->dev; 3913} 3914EXPORT_SYMBOL_GPL(rdev_get_dev); 3915 3916void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3917{ 3918 return reg_init_data->driver_data; 3919} 3920EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3921 3922#ifdef CONFIG_DEBUG_FS 3923static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3924 size_t count, loff_t *ppos) 3925{ 3926 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3927 ssize_t len, ret = 0; 3928 struct regulator_map *map; 3929 3930 if (!buf) 3931 return -ENOMEM; 3932 3933 list_for_each_entry(map, ®ulator_map_list, list) { 3934 len = snprintf(buf + ret, PAGE_SIZE - ret, 3935 "%s -> %s.%s\n", 3936 rdev_get_name(map->regulator), map->dev_name, 3937 map->supply); 3938 if (len >= 0) 3939 ret += len; 3940 if (ret > PAGE_SIZE) { 3941 ret = PAGE_SIZE; 3942 break; 3943 } 3944 } 3945 3946 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3947 3948 kfree(buf); 3949 3950 return ret; 3951} 3952#endif 3953 3954static const struct file_operations supply_map_fops = { 3955#ifdef CONFIG_DEBUG_FS 3956 .read = supply_map_read_file, 3957 .llseek = default_llseek, 3958#endif 3959}; 3960 3961static int __init regulator_init(void) 3962{ 3963 int ret; 3964 3965 ret = class_register(®ulator_class); 3966 3967 debugfs_root = debugfs_create_dir("regulator", NULL); 3968 if (!debugfs_root) 3969 pr_warn("regulator: Failed to create debugfs directory\n"); 3970 3971 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3972 &supply_map_fops); 3973 3974 regulator_dummy_init(); 3975 3976 return ret; 3977} 3978 3979/* init early to allow our consumers to complete system booting */ 3980core_initcall(regulator_init); 3981 3982static int __init regulator_init_complete(void) 3983{ 3984 struct regulator_dev *rdev; 3985 struct regulator_ops *ops; 3986 struct regulation_constraints *c; 3987 int enabled, ret; 3988 3989 /* 3990 * Since DT doesn't provide an idiomatic mechanism for 3991 * enabling full constraints and since it's much more natural 3992 * with DT to provide them just assume that a DT enabled 3993 * system has full constraints. 3994 */ 3995 if (of_have_populated_dt()) 3996 has_full_constraints = true; 3997 3998 mutex_lock(®ulator_list_mutex); 3999 4000 /* If we have a full configuration then disable any regulators 4001 * which are not in use or always_on. This will become the 4002 * default behaviour in the future. 4003 */ 4004 list_for_each_entry(rdev, ®ulator_list, list) { 4005 ops = rdev->desc->ops; 4006 c = rdev->constraints; 4007 4008 if (!ops->disable || (c && c->always_on)) 4009 continue; 4010 4011 mutex_lock(&rdev->mutex); 4012 4013 if (rdev->use_count) 4014 goto unlock; 4015 4016 /* If we can't read the status assume it's on. */ 4017 if (ops->is_enabled) 4018 enabled = ops->is_enabled(rdev); 4019 else 4020 enabled = 1; 4021 4022 if (!enabled) 4023 goto unlock; 4024 4025 if (has_full_constraints) { 4026 /* We log since this may kill the system if it 4027 * goes wrong. */ 4028 rdev_info(rdev, "disabling\n"); 4029 ret = ops->disable(rdev); 4030 if (ret != 0) { 4031 rdev_err(rdev, "couldn't disable: %d\n", ret); 4032 } 4033 } else { 4034 /* The intention is that in future we will 4035 * assume that full constraints are provided 4036 * so warn even if we aren't going to do 4037 * anything here. 4038 */ 4039 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 4040 } 4041 4042unlock: 4043 mutex_unlock(&rdev->mutex); 4044 } 4045 4046 mutex_unlock(®ulator_list_mutex); 4047 4048 return 0; 4049} 4050late_initcall(regulator_init_complete); 4051