core.c revision 7b74d149247c8972da1cec3e4c70b67049aaeb69
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static LIST_HEAD(regulator_ena_gpio_list); 55static bool has_full_constraints; 56static bool board_wants_dummy_regulator; 57 58static struct dentry *debugfs_root; 59 60/* 61 * struct regulator_map 62 * 63 * Used to provide symbolic supply names to devices. 64 */ 65struct regulator_map { 66 struct list_head list; 67 const char *dev_name; /* The dev_name() for the consumer */ 68 const char *supply; 69 struct regulator_dev *regulator; 70}; 71 72/* 73 * struct regulator_enable_gpio 74 * 75 * Management for shared enable GPIO pin 76 */ 77struct regulator_enable_gpio { 78 struct list_head list; 79 int gpio; 80 u32 enable_count; /* a number of enabled shared GPIO */ 81 u32 request_count; /* a number of requested shared GPIO */ 82 unsigned int ena_gpio_invert:1; 83}; 84 85/* 86 * struct regulator 87 * 88 * One for each consumer device. 89 */ 90struct regulator { 91 struct device *dev; 92 struct list_head list; 93 unsigned int always_on:1; 94 unsigned int bypass:1; 95 int uA_load; 96 int min_uV; 97 int max_uV; 98 char *supply_name; 99 struct device_attribute dev_attr; 100 struct regulator_dev *rdev; 101 struct dentry *debugfs; 102}; 103 104static int _regulator_is_enabled(struct regulator_dev *rdev); 105static int _regulator_disable(struct regulator_dev *rdev); 106static int _regulator_get_voltage(struct regulator_dev *rdev); 107static int _regulator_get_current_limit(struct regulator_dev *rdev); 108static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 109static void _notifier_call_chain(struct regulator_dev *rdev, 110 unsigned long event, void *data); 111static int _regulator_do_set_voltage(struct regulator_dev *rdev, 112 int min_uV, int max_uV); 113static struct regulator *create_regulator(struct regulator_dev *rdev, 114 struct device *dev, 115 const char *supply_name); 116 117static const char *rdev_get_name(struct regulator_dev *rdev) 118{ 119 if (rdev->constraints && rdev->constraints->name) 120 return rdev->constraints->name; 121 else if (rdev->desc->name) 122 return rdev->desc->name; 123 else 124 return ""; 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * retruns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t regulator_name_show(struct device *dev, 327 struct device_attribute *attr, char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333 334static ssize_t regulator_print_opmode(char *buf, int mode) 335{ 336 switch (mode) { 337 case REGULATOR_MODE_FAST: 338 return sprintf(buf, "fast\n"); 339 case REGULATOR_MODE_NORMAL: 340 return sprintf(buf, "normal\n"); 341 case REGULATOR_MODE_IDLE: 342 return sprintf(buf, "idle\n"); 343 case REGULATOR_MODE_STANDBY: 344 return sprintf(buf, "standby\n"); 345 } 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_opmode_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 354 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 355} 356static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 357 358static ssize_t regulator_print_state(char *buf, int state) 359{ 360 if (state > 0) 361 return sprintf(buf, "enabled\n"); 362 else if (state == 0) 363 return sprintf(buf, "disabled\n"); 364 else 365 return sprintf(buf, "unknown\n"); 366} 367 368static ssize_t regulator_state_show(struct device *dev, 369 struct device_attribute *attr, char *buf) 370{ 371 struct regulator_dev *rdev = dev_get_drvdata(dev); 372 ssize_t ret; 373 374 mutex_lock(&rdev->mutex); 375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 376 mutex_unlock(&rdev->mutex); 377 378 return ret; 379} 380static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 381 382static ssize_t regulator_status_show(struct device *dev, 383 struct device_attribute *attr, char *buf) 384{ 385 struct regulator_dev *rdev = dev_get_drvdata(dev); 386 int status; 387 char *label; 388 389 status = rdev->desc->ops->get_status(rdev); 390 if (status < 0) 391 return status; 392 393 switch (status) { 394 case REGULATOR_STATUS_OFF: 395 label = "off"; 396 break; 397 case REGULATOR_STATUS_ON: 398 label = "on"; 399 break; 400 case REGULATOR_STATUS_ERROR: 401 label = "error"; 402 break; 403 case REGULATOR_STATUS_FAST: 404 label = "fast"; 405 break; 406 case REGULATOR_STATUS_NORMAL: 407 label = "normal"; 408 break; 409 case REGULATOR_STATUS_IDLE: 410 label = "idle"; 411 break; 412 case REGULATOR_STATUS_STANDBY: 413 label = "standby"; 414 break; 415 case REGULATOR_STATUS_BYPASS: 416 label = "bypass"; 417 break; 418 case REGULATOR_STATUS_UNDEFINED: 419 label = "undefined"; 420 break; 421 default: 422 return -ERANGE; 423 } 424 425 return sprintf(buf, "%s\n", label); 426} 427static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 428 429static ssize_t regulator_min_uA_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431{ 432 struct regulator_dev *rdev = dev_get_drvdata(dev); 433 434 if (!rdev->constraints) 435 return sprintf(buf, "constraint not defined\n"); 436 437 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 438} 439static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 440 441static ssize_t regulator_max_uA_show(struct device *dev, 442 struct device_attribute *attr, char *buf) 443{ 444 struct regulator_dev *rdev = dev_get_drvdata(dev); 445 446 if (!rdev->constraints) 447 return sprintf(buf, "constraint not defined\n"); 448 449 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 450} 451static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 452 453static ssize_t regulator_min_uV_show(struct device *dev, 454 struct device_attribute *attr, char *buf) 455{ 456 struct regulator_dev *rdev = dev_get_drvdata(dev); 457 458 if (!rdev->constraints) 459 return sprintf(buf, "constraint not defined\n"); 460 461 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 462} 463static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 464 465static ssize_t regulator_max_uV_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467{ 468 struct regulator_dev *rdev = dev_get_drvdata(dev); 469 470 if (!rdev->constraints) 471 return sprintf(buf, "constraint not defined\n"); 472 473 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 474} 475static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 476 477static ssize_t regulator_total_uA_show(struct device *dev, 478 struct device_attribute *attr, char *buf) 479{ 480 struct regulator_dev *rdev = dev_get_drvdata(dev); 481 struct regulator *regulator; 482 int uA = 0; 483 484 mutex_lock(&rdev->mutex); 485 list_for_each_entry(regulator, &rdev->consumer_list, list) 486 uA += regulator->uA_load; 487 mutex_unlock(&rdev->mutex); 488 return sprintf(buf, "%d\n", uA); 489} 490static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 491 492static ssize_t regulator_num_users_show(struct device *dev, 493 struct device_attribute *attr, char *buf) 494{ 495 struct regulator_dev *rdev = dev_get_drvdata(dev); 496 return sprintf(buf, "%d\n", rdev->use_count); 497} 498 499static ssize_t regulator_type_show(struct device *dev, 500 struct device_attribute *attr, char *buf) 501{ 502 struct regulator_dev *rdev = dev_get_drvdata(dev); 503 504 switch (rdev->desc->type) { 505 case REGULATOR_VOLTAGE: 506 return sprintf(buf, "voltage\n"); 507 case REGULATOR_CURRENT: 508 return sprintf(buf, "current\n"); 509 } 510 return sprintf(buf, "unknown\n"); 511} 512 513static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 514 struct device_attribute *attr, char *buf) 515{ 516 struct regulator_dev *rdev = dev_get_drvdata(dev); 517 518 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 519} 520static DEVICE_ATTR(suspend_mem_microvolts, 0444, 521 regulator_suspend_mem_uV_show, NULL); 522 523static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 524 struct device_attribute *attr, char *buf) 525{ 526 struct regulator_dev *rdev = dev_get_drvdata(dev); 527 528 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 529} 530static DEVICE_ATTR(suspend_disk_microvolts, 0444, 531 regulator_suspend_disk_uV_show, NULL); 532 533static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 534 struct device_attribute *attr, char *buf) 535{ 536 struct regulator_dev *rdev = dev_get_drvdata(dev); 537 538 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 539} 540static DEVICE_ATTR(suspend_standby_microvolts, 0444, 541 regulator_suspend_standby_uV_show, NULL); 542 543static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 544 struct device_attribute *attr, char *buf) 545{ 546 struct regulator_dev *rdev = dev_get_drvdata(dev); 547 548 return regulator_print_opmode(buf, 549 rdev->constraints->state_mem.mode); 550} 551static DEVICE_ATTR(suspend_mem_mode, 0444, 552 regulator_suspend_mem_mode_show, NULL); 553 554static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 555 struct device_attribute *attr, char *buf) 556{ 557 struct regulator_dev *rdev = dev_get_drvdata(dev); 558 559 return regulator_print_opmode(buf, 560 rdev->constraints->state_disk.mode); 561} 562static DEVICE_ATTR(suspend_disk_mode, 0444, 563 regulator_suspend_disk_mode_show, NULL); 564 565static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 566 struct device_attribute *attr, char *buf) 567{ 568 struct regulator_dev *rdev = dev_get_drvdata(dev); 569 570 return regulator_print_opmode(buf, 571 rdev->constraints->state_standby.mode); 572} 573static DEVICE_ATTR(suspend_standby_mode, 0444, 574 regulator_suspend_standby_mode_show, NULL); 575 576static ssize_t regulator_suspend_mem_state_show(struct device *dev, 577 struct device_attribute *attr, char *buf) 578{ 579 struct regulator_dev *rdev = dev_get_drvdata(dev); 580 581 return regulator_print_state(buf, 582 rdev->constraints->state_mem.enabled); 583} 584static DEVICE_ATTR(suspend_mem_state, 0444, 585 regulator_suspend_mem_state_show, NULL); 586 587static ssize_t regulator_suspend_disk_state_show(struct device *dev, 588 struct device_attribute *attr, char *buf) 589{ 590 struct regulator_dev *rdev = dev_get_drvdata(dev); 591 592 return regulator_print_state(buf, 593 rdev->constraints->state_disk.enabled); 594} 595static DEVICE_ATTR(suspend_disk_state, 0444, 596 regulator_suspend_disk_state_show, NULL); 597 598static ssize_t regulator_suspend_standby_state_show(struct device *dev, 599 struct device_attribute *attr, char *buf) 600{ 601 struct regulator_dev *rdev = dev_get_drvdata(dev); 602 603 return regulator_print_state(buf, 604 rdev->constraints->state_standby.enabled); 605} 606static DEVICE_ATTR(suspend_standby_state, 0444, 607 regulator_suspend_standby_state_show, NULL); 608 609static ssize_t regulator_bypass_show(struct device *dev, 610 struct device_attribute *attr, char *buf) 611{ 612 struct regulator_dev *rdev = dev_get_drvdata(dev); 613 const char *report; 614 bool bypass; 615 int ret; 616 617 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 618 619 if (ret != 0) 620 report = "unknown"; 621 else if (bypass) 622 report = "enabled"; 623 else 624 report = "disabled"; 625 626 return sprintf(buf, "%s\n", report); 627} 628static DEVICE_ATTR(bypass, 0444, 629 regulator_bypass_show, NULL); 630 631/* 632 * These are the only attributes are present for all regulators. 633 * Other attributes are a function of regulator functionality. 634 */ 635static struct device_attribute regulator_dev_attrs[] = { 636 __ATTR(name, 0444, regulator_name_show, NULL), 637 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 638 __ATTR(type, 0444, regulator_type_show, NULL), 639 __ATTR_NULL, 640}; 641 642static void regulator_dev_release(struct device *dev) 643{ 644 struct regulator_dev *rdev = dev_get_drvdata(dev); 645 kfree(rdev); 646} 647 648static struct class regulator_class = { 649 .name = "regulator", 650 .dev_release = regulator_dev_release, 651 .dev_attrs = regulator_dev_attrs, 652}; 653 654/* Calculate the new optimum regulator operating mode based on the new total 655 * consumer load. All locks held by caller */ 656static void drms_uA_update(struct regulator_dev *rdev) 657{ 658 struct regulator *sibling; 659 int current_uA = 0, output_uV, input_uV, err; 660 unsigned int mode; 661 662 err = regulator_check_drms(rdev); 663 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 664 (!rdev->desc->ops->get_voltage && 665 !rdev->desc->ops->get_voltage_sel) || 666 !rdev->desc->ops->set_mode) 667 return; 668 669 /* get output voltage */ 670 output_uV = _regulator_get_voltage(rdev); 671 if (output_uV <= 0) 672 return; 673 674 /* get input voltage */ 675 input_uV = 0; 676 if (rdev->supply) 677 input_uV = regulator_get_voltage(rdev->supply); 678 if (input_uV <= 0) 679 input_uV = rdev->constraints->input_uV; 680 if (input_uV <= 0) 681 return; 682 683 /* calc total requested load */ 684 list_for_each_entry(sibling, &rdev->consumer_list, list) 685 current_uA += sibling->uA_load; 686 687 /* now get the optimum mode for our new total regulator load */ 688 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 689 output_uV, current_uA); 690 691 /* check the new mode is allowed */ 692 err = regulator_mode_constrain(rdev, &mode); 693 if (err == 0) 694 rdev->desc->ops->set_mode(rdev, mode); 695} 696 697static int suspend_set_state(struct regulator_dev *rdev, 698 struct regulator_state *rstate) 699{ 700 int ret = 0; 701 702 /* If we have no suspend mode configration don't set anything; 703 * only warn if the driver implements set_suspend_voltage or 704 * set_suspend_mode callback. 705 */ 706 if (!rstate->enabled && !rstate->disabled) { 707 if (rdev->desc->ops->set_suspend_voltage || 708 rdev->desc->ops->set_suspend_mode) 709 rdev_warn(rdev, "No configuration\n"); 710 return 0; 711 } 712 713 if (rstate->enabled && rstate->disabled) { 714 rdev_err(rdev, "invalid configuration\n"); 715 return -EINVAL; 716 } 717 718 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 719 ret = rdev->desc->ops->set_suspend_enable(rdev); 720 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 721 ret = rdev->desc->ops->set_suspend_disable(rdev); 722 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 723 ret = 0; 724 725 if (ret < 0) { 726 rdev_err(rdev, "failed to enabled/disable\n"); 727 return ret; 728 } 729 730 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 731 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 732 if (ret < 0) { 733 rdev_err(rdev, "failed to set voltage\n"); 734 return ret; 735 } 736 } 737 738 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 739 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 740 if (ret < 0) { 741 rdev_err(rdev, "failed to set mode\n"); 742 return ret; 743 } 744 } 745 return ret; 746} 747 748/* locks held by caller */ 749static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 750{ 751 if (!rdev->constraints) 752 return -EINVAL; 753 754 switch (state) { 755 case PM_SUSPEND_STANDBY: 756 return suspend_set_state(rdev, 757 &rdev->constraints->state_standby); 758 case PM_SUSPEND_MEM: 759 return suspend_set_state(rdev, 760 &rdev->constraints->state_mem); 761 case PM_SUSPEND_MAX: 762 return suspend_set_state(rdev, 763 &rdev->constraints->state_disk); 764 default: 765 return -EINVAL; 766 } 767} 768 769static void print_constraints(struct regulator_dev *rdev) 770{ 771 struct regulation_constraints *constraints = rdev->constraints; 772 char buf[80] = ""; 773 int count = 0; 774 int ret; 775 776 if (constraints->min_uV && constraints->max_uV) { 777 if (constraints->min_uV == constraints->max_uV) 778 count += sprintf(buf + count, "%d mV ", 779 constraints->min_uV / 1000); 780 else 781 count += sprintf(buf + count, "%d <--> %d mV ", 782 constraints->min_uV / 1000, 783 constraints->max_uV / 1000); 784 } 785 786 if (!constraints->min_uV || 787 constraints->min_uV != constraints->max_uV) { 788 ret = _regulator_get_voltage(rdev); 789 if (ret > 0) 790 count += sprintf(buf + count, "at %d mV ", ret / 1000); 791 } 792 793 if (constraints->uV_offset) 794 count += sprintf(buf, "%dmV offset ", 795 constraints->uV_offset / 1000); 796 797 if (constraints->min_uA && constraints->max_uA) { 798 if (constraints->min_uA == constraints->max_uA) 799 count += sprintf(buf + count, "%d mA ", 800 constraints->min_uA / 1000); 801 else 802 count += sprintf(buf + count, "%d <--> %d mA ", 803 constraints->min_uA / 1000, 804 constraints->max_uA / 1000); 805 } 806 807 if (!constraints->min_uA || 808 constraints->min_uA != constraints->max_uA) { 809 ret = _regulator_get_current_limit(rdev); 810 if (ret > 0) 811 count += sprintf(buf + count, "at %d mA ", ret / 1000); 812 } 813 814 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 815 count += sprintf(buf + count, "fast "); 816 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 817 count += sprintf(buf + count, "normal "); 818 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 819 count += sprintf(buf + count, "idle "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 821 count += sprintf(buf + count, "standby"); 822 823 if (!count) 824 sprintf(buf, "no parameters"); 825 826 rdev_info(rdev, "%s\n", buf); 827 828 if ((constraints->min_uV != constraints->max_uV) && 829 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 830 rdev_warn(rdev, 831 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 832} 833 834static int machine_constraints_voltage(struct regulator_dev *rdev, 835 struct regulation_constraints *constraints) 836{ 837 struct regulator_ops *ops = rdev->desc->ops; 838 int ret; 839 840 /* do we need to apply the constraint voltage */ 841 if (rdev->constraints->apply_uV && 842 rdev->constraints->min_uV == rdev->constraints->max_uV) { 843 ret = _regulator_do_set_voltage(rdev, 844 rdev->constraints->min_uV, 845 rdev->constraints->max_uV); 846 if (ret < 0) { 847 rdev_err(rdev, "failed to apply %duV constraint\n", 848 rdev->constraints->min_uV); 849 return ret; 850 } 851 } 852 853 /* constrain machine-level voltage specs to fit 854 * the actual range supported by this regulator. 855 */ 856 if (ops->list_voltage && rdev->desc->n_voltages) { 857 int count = rdev->desc->n_voltages; 858 int i; 859 int min_uV = INT_MAX; 860 int max_uV = INT_MIN; 861 int cmin = constraints->min_uV; 862 int cmax = constraints->max_uV; 863 864 /* it's safe to autoconfigure fixed-voltage supplies 865 and the constraints are used by list_voltage. */ 866 if (count == 1 && !cmin) { 867 cmin = 1; 868 cmax = INT_MAX; 869 constraints->min_uV = cmin; 870 constraints->max_uV = cmax; 871 } 872 873 /* voltage constraints are optional */ 874 if ((cmin == 0) && (cmax == 0)) 875 return 0; 876 877 /* else require explicit machine-level constraints */ 878 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 879 rdev_err(rdev, "invalid voltage constraints\n"); 880 return -EINVAL; 881 } 882 883 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 884 for (i = 0; i < count; i++) { 885 int value; 886 887 value = ops->list_voltage(rdev, i); 888 if (value <= 0) 889 continue; 890 891 /* maybe adjust [min_uV..max_uV] */ 892 if (value >= cmin && value < min_uV) 893 min_uV = value; 894 if (value <= cmax && value > max_uV) 895 max_uV = value; 896 } 897 898 /* final: [min_uV..max_uV] valid iff constraints valid */ 899 if (max_uV < min_uV) { 900 rdev_err(rdev, 901 "unsupportable voltage constraints %u-%uuV\n", 902 min_uV, max_uV); 903 return -EINVAL; 904 } 905 906 /* use regulator's subset of machine constraints */ 907 if (constraints->min_uV < min_uV) { 908 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 909 constraints->min_uV, min_uV); 910 constraints->min_uV = min_uV; 911 } 912 if (constraints->max_uV > max_uV) { 913 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 914 constraints->max_uV, max_uV); 915 constraints->max_uV = max_uV; 916 } 917 } 918 919 return 0; 920} 921 922/** 923 * set_machine_constraints - sets regulator constraints 924 * @rdev: regulator source 925 * @constraints: constraints to apply 926 * 927 * Allows platform initialisation code to define and constrain 928 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 929 * Constraints *must* be set by platform code in order for some 930 * regulator operations to proceed i.e. set_voltage, set_current_limit, 931 * set_mode. 932 */ 933static int set_machine_constraints(struct regulator_dev *rdev, 934 const struct regulation_constraints *constraints) 935{ 936 int ret = 0; 937 struct regulator_ops *ops = rdev->desc->ops; 938 939 if (constraints) 940 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 941 GFP_KERNEL); 942 else 943 rdev->constraints = kzalloc(sizeof(*constraints), 944 GFP_KERNEL); 945 if (!rdev->constraints) 946 return -ENOMEM; 947 948 ret = machine_constraints_voltage(rdev, rdev->constraints); 949 if (ret != 0) 950 goto out; 951 952 /* do we need to setup our suspend state */ 953 if (rdev->constraints->initial_state) { 954 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 955 if (ret < 0) { 956 rdev_err(rdev, "failed to set suspend state\n"); 957 goto out; 958 } 959 } 960 961 if (rdev->constraints->initial_mode) { 962 if (!ops->set_mode) { 963 rdev_err(rdev, "no set_mode operation\n"); 964 ret = -EINVAL; 965 goto out; 966 } 967 968 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 969 if (ret < 0) { 970 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 971 goto out; 972 } 973 } 974 975 /* If the constraints say the regulator should be on at this point 976 * and we have control then make sure it is enabled. 977 */ 978 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 979 ops->enable) { 980 ret = ops->enable(rdev); 981 if (ret < 0) { 982 rdev_err(rdev, "failed to enable\n"); 983 goto out; 984 } 985 } 986 987 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 988 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 989 if (ret < 0) { 990 rdev_err(rdev, "failed to set ramp_delay\n"); 991 goto out; 992 } 993 } 994 995 print_constraints(rdev); 996 return 0; 997out: 998 kfree(rdev->constraints); 999 rdev->constraints = NULL; 1000 return ret; 1001} 1002 1003/** 1004 * set_supply - set regulator supply regulator 1005 * @rdev: regulator name 1006 * @supply_rdev: supply regulator name 1007 * 1008 * Called by platform initialisation code to set the supply regulator for this 1009 * regulator. This ensures that a regulators supply will also be enabled by the 1010 * core if it's child is enabled. 1011 */ 1012static int set_supply(struct regulator_dev *rdev, 1013 struct regulator_dev *supply_rdev) 1014{ 1015 int err; 1016 1017 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1018 1019 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1020 if (rdev->supply == NULL) { 1021 err = -ENOMEM; 1022 return err; 1023 } 1024 supply_rdev->open_count++; 1025 1026 return 0; 1027} 1028 1029/** 1030 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1031 * @rdev: regulator source 1032 * @consumer_dev_name: dev_name() string for device supply applies to 1033 * @supply: symbolic name for supply 1034 * 1035 * Allows platform initialisation code to map physical regulator 1036 * sources to symbolic names for supplies for use by devices. Devices 1037 * should use these symbolic names to request regulators, avoiding the 1038 * need to provide board-specific regulator names as platform data. 1039 */ 1040static int set_consumer_device_supply(struct regulator_dev *rdev, 1041 const char *consumer_dev_name, 1042 const char *supply) 1043{ 1044 struct regulator_map *node; 1045 int has_dev; 1046 1047 if (supply == NULL) 1048 return -EINVAL; 1049 1050 if (consumer_dev_name != NULL) 1051 has_dev = 1; 1052 else 1053 has_dev = 0; 1054 1055 list_for_each_entry(node, ®ulator_map_list, list) { 1056 if (node->dev_name && consumer_dev_name) { 1057 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1058 continue; 1059 } else if (node->dev_name || consumer_dev_name) { 1060 continue; 1061 } 1062 1063 if (strcmp(node->supply, supply) != 0) 1064 continue; 1065 1066 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1067 consumer_dev_name, 1068 dev_name(&node->regulator->dev), 1069 node->regulator->desc->name, 1070 supply, 1071 dev_name(&rdev->dev), rdev_get_name(rdev)); 1072 return -EBUSY; 1073 } 1074 1075 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1076 if (node == NULL) 1077 return -ENOMEM; 1078 1079 node->regulator = rdev; 1080 node->supply = supply; 1081 1082 if (has_dev) { 1083 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1084 if (node->dev_name == NULL) { 1085 kfree(node); 1086 return -ENOMEM; 1087 } 1088 } 1089 1090 list_add(&node->list, ®ulator_map_list); 1091 return 0; 1092} 1093 1094static void unset_regulator_supplies(struct regulator_dev *rdev) 1095{ 1096 struct regulator_map *node, *n; 1097 1098 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1099 if (rdev == node->regulator) { 1100 list_del(&node->list); 1101 kfree(node->dev_name); 1102 kfree(node); 1103 } 1104 } 1105} 1106 1107#define REG_STR_SIZE 64 1108 1109static struct regulator *create_regulator(struct regulator_dev *rdev, 1110 struct device *dev, 1111 const char *supply_name) 1112{ 1113 struct regulator *regulator; 1114 char buf[REG_STR_SIZE]; 1115 int err, size; 1116 1117 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1118 if (regulator == NULL) 1119 return NULL; 1120 1121 mutex_lock(&rdev->mutex); 1122 regulator->rdev = rdev; 1123 list_add(®ulator->list, &rdev->consumer_list); 1124 1125 if (dev) { 1126 regulator->dev = dev; 1127 1128 /* Add a link to the device sysfs entry */ 1129 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1130 dev->kobj.name, supply_name); 1131 if (size >= REG_STR_SIZE) 1132 goto overflow_err; 1133 1134 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1135 if (regulator->supply_name == NULL) 1136 goto overflow_err; 1137 1138 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1139 buf); 1140 if (err) { 1141 rdev_warn(rdev, "could not add device link %s err %d\n", 1142 dev->kobj.name, err); 1143 /* non-fatal */ 1144 } 1145 } else { 1146 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1147 if (regulator->supply_name == NULL) 1148 goto overflow_err; 1149 } 1150 1151 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1152 rdev->debugfs); 1153 if (!regulator->debugfs) { 1154 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1155 } else { 1156 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1157 ®ulator->uA_load); 1158 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1159 ®ulator->min_uV); 1160 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1161 ®ulator->max_uV); 1162 } 1163 1164 /* 1165 * Check now if the regulator is an always on regulator - if 1166 * it is then we don't need to do nearly so much work for 1167 * enable/disable calls. 1168 */ 1169 if (!_regulator_can_change_status(rdev) && 1170 _regulator_is_enabled(rdev)) 1171 regulator->always_on = true; 1172 1173 mutex_unlock(&rdev->mutex); 1174 return regulator; 1175overflow_err: 1176 list_del(®ulator->list); 1177 kfree(regulator); 1178 mutex_unlock(&rdev->mutex); 1179 return NULL; 1180} 1181 1182static int _regulator_get_enable_time(struct regulator_dev *rdev) 1183{ 1184 if (!rdev->desc->ops->enable_time) 1185 return rdev->desc->enable_time; 1186 return rdev->desc->ops->enable_time(rdev); 1187} 1188 1189static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1190 const char *supply, 1191 int *ret) 1192{ 1193 struct regulator_dev *r; 1194 struct device_node *node; 1195 struct regulator_map *map; 1196 const char *devname = NULL; 1197 1198 /* first do a dt based lookup */ 1199 if (dev && dev->of_node) { 1200 node = of_get_regulator(dev, supply); 1201 if (node) { 1202 list_for_each_entry(r, ®ulator_list, list) 1203 if (r->dev.parent && 1204 node == r->dev.of_node) 1205 return r; 1206 } else { 1207 /* 1208 * If we couldn't even get the node then it's 1209 * not just that the device didn't register 1210 * yet, there's no node and we'll never 1211 * succeed. 1212 */ 1213 *ret = -ENODEV; 1214 } 1215 } 1216 1217 /* if not found, try doing it non-dt way */ 1218 if (dev) 1219 devname = dev_name(dev); 1220 1221 list_for_each_entry(r, ®ulator_list, list) 1222 if (strcmp(rdev_get_name(r), supply) == 0) 1223 return r; 1224 1225 list_for_each_entry(map, ®ulator_map_list, list) { 1226 /* If the mapping has a device set up it must match */ 1227 if (map->dev_name && 1228 (!devname || strcmp(map->dev_name, devname))) 1229 continue; 1230 1231 if (strcmp(map->supply, supply) == 0) 1232 return map->regulator; 1233 } 1234 1235 1236 return NULL; 1237} 1238 1239/* Internal regulator request function */ 1240static struct regulator *_regulator_get(struct device *dev, const char *id, 1241 int exclusive) 1242{ 1243 struct regulator_dev *rdev; 1244 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1245 const char *devname = NULL; 1246 int ret; 1247 1248 if (id == NULL) { 1249 pr_err("get() with no identifier\n"); 1250 return regulator; 1251 } 1252 1253 if (dev) 1254 devname = dev_name(dev); 1255 1256 mutex_lock(®ulator_list_mutex); 1257 1258 rdev = regulator_dev_lookup(dev, id, &ret); 1259 if (rdev) 1260 goto found; 1261 1262 if (board_wants_dummy_regulator) { 1263 rdev = dummy_regulator_rdev; 1264 goto found; 1265 } 1266 1267#ifdef CONFIG_REGULATOR_DUMMY 1268 if (!devname) 1269 devname = "deviceless"; 1270 1271 /* If the board didn't flag that it was fully constrained then 1272 * substitute in a dummy regulator so consumers can continue. 1273 */ 1274 if (!has_full_constraints) { 1275 pr_warn("%s supply %s not found, using dummy regulator\n", 1276 devname, id); 1277 rdev = dummy_regulator_rdev; 1278 goto found; 1279 } 1280#endif 1281 1282 mutex_unlock(®ulator_list_mutex); 1283 return regulator; 1284 1285found: 1286 if (rdev->exclusive) { 1287 regulator = ERR_PTR(-EPERM); 1288 goto out; 1289 } 1290 1291 if (exclusive && rdev->open_count) { 1292 regulator = ERR_PTR(-EBUSY); 1293 goto out; 1294 } 1295 1296 if (!try_module_get(rdev->owner)) 1297 goto out; 1298 1299 regulator = create_regulator(rdev, dev, id); 1300 if (regulator == NULL) { 1301 regulator = ERR_PTR(-ENOMEM); 1302 module_put(rdev->owner); 1303 goto out; 1304 } 1305 1306 rdev->open_count++; 1307 if (exclusive) { 1308 rdev->exclusive = 1; 1309 1310 ret = _regulator_is_enabled(rdev); 1311 if (ret > 0) 1312 rdev->use_count = 1; 1313 else 1314 rdev->use_count = 0; 1315 } 1316 1317out: 1318 mutex_unlock(®ulator_list_mutex); 1319 1320 return regulator; 1321} 1322 1323/** 1324 * regulator_get - lookup and obtain a reference to a regulator. 1325 * @dev: device for regulator "consumer" 1326 * @id: Supply name or regulator ID. 1327 * 1328 * Returns a struct regulator corresponding to the regulator producer, 1329 * or IS_ERR() condition containing errno. 1330 * 1331 * Use of supply names configured via regulator_set_device_supply() is 1332 * strongly encouraged. It is recommended that the supply name used 1333 * should match the name used for the supply and/or the relevant 1334 * device pins in the datasheet. 1335 */ 1336struct regulator *regulator_get(struct device *dev, const char *id) 1337{ 1338 return _regulator_get(dev, id, 0); 1339} 1340EXPORT_SYMBOL_GPL(regulator_get); 1341 1342static void devm_regulator_release(struct device *dev, void *res) 1343{ 1344 regulator_put(*(struct regulator **)res); 1345} 1346 1347/** 1348 * devm_regulator_get - Resource managed regulator_get() 1349 * @dev: device for regulator "consumer" 1350 * @id: Supply name or regulator ID. 1351 * 1352 * Managed regulator_get(). Regulators returned from this function are 1353 * automatically regulator_put() on driver detach. See regulator_get() for more 1354 * information. 1355 */ 1356struct regulator *devm_regulator_get(struct device *dev, const char *id) 1357{ 1358 struct regulator **ptr, *regulator; 1359 1360 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1361 if (!ptr) 1362 return ERR_PTR(-ENOMEM); 1363 1364 regulator = regulator_get(dev, id); 1365 if (!IS_ERR(regulator)) { 1366 *ptr = regulator; 1367 devres_add(dev, ptr); 1368 } else { 1369 devres_free(ptr); 1370 } 1371 1372 return regulator; 1373} 1374EXPORT_SYMBOL_GPL(devm_regulator_get); 1375 1376/** 1377 * regulator_get_exclusive - obtain exclusive access to a regulator. 1378 * @dev: device for regulator "consumer" 1379 * @id: Supply name or regulator ID. 1380 * 1381 * Returns a struct regulator corresponding to the regulator producer, 1382 * or IS_ERR() condition containing errno. Other consumers will be 1383 * unable to obtain this reference is held and the use count for the 1384 * regulator will be initialised to reflect the current state of the 1385 * regulator. 1386 * 1387 * This is intended for use by consumers which cannot tolerate shared 1388 * use of the regulator such as those which need to force the 1389 * regulator off for correct operation of the hardware they are 1390 * controlling. 1391 * 1392 * Use of supply names configured via regulator_set_device_supply() is 1393 * strongly encouraged. It is recommended that the supply name used 1394 * should match the name used for the supply and/or the relevant 1395 * device pins in the datasheet. 1396 */ 1397struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1398{ 1399 return _regulator_get(dev, id, 1); 1400} 1401EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1402 1403/* Locks held by regulator_put() */ 1404static void _regulator_put(struct regulator *regulator) 1405{ 1406 struct regulator_dev *rdev; 1407 1408 if (regulator == NULL || IS_ERR(regulator)) 1409 return; 1410 1411 rdev = regulator->rdev; 1412 1413 debugfs_remove_recursive(regulator->debugfs); 1414 1415 /* remove any sysfs entries */ 1416 if (regulator->dev) 1417 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1418 kfree(regulator->supply_name); 1419 list_del(®ulator->list); 1420 kfree(regulator); 1421 1422 rdev->open_count--; 1423 rdev->exclusive = 0; 1424 1425 module_put(rdev->owner); 1426} 1427 1428/** 1429 * regulator_put - "free" the regulator source 1430 * @regulator: regulator source 1431 * 1432 * Note: drivers must ensure that all regulator_enable calls made on this 1433 * regulator source are balanced by regulator_disable calls prior to calling 1434 * this function. 1435 */ 1436void regulator_put(struct regulator *regulator) 1437{ 1438 mutex_lock(®ulator_list_mutex); 1439 _regulator_put(regulator); 1440 mutex_unlock(®ulator_list_mutex); 1441} 1442EXPORT_SYMBOL_GPL(regulator_put); 1443 1444static int devm_regulator_match(struct device *dev, void *res, void *data) 1445{ 1446 struct regulator **r = res; 1447 if (!r || !*r) { 1448 WARN_ON(!r || !*r); 1449 return 0; 1450 } 1451 return *r == data; 1452} 1453 1454/** 1455 * devm_regulator_put - Resource managed regulator_put() 1456 * @regulator: regulator to free 1457 * 1458 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1459 * this function will not need to be called and the resource management 1460 * code will ensure that the resource is freed. 1461 */ 1462void devm_regulator_put(struct regulator *regulator) 1463{ 1464 int rc; 1465 1466 rc = devres_release(regulator->dev, devm_regulator_release, 1467 devm_regulator_match, regulator); 1468 if (rc != 0) 1469 WARN_ON(rc); 1470} 1471EXPORT_SYMBOL_GPL(devm_regulator_put); 1472 1473/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1474static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1475 const struct regulator_config *config) 1476{ 1477 struct regulator_enable_gpio *pin; 1478 int ret; 1479 1480 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1481 if (pin->gpio == config->ena_gpio) { 1482 rdev_dbg(rdev, "GPIO %d is already used\n", 1483 config->ena_gpio); 1484 goto update_ena_gpio_to_rdev; 1485 } 1486 } 1487 1488 ret = gpio_request_one(config->ena_gpio, 1489 GPIOF_DIR_OUT | config->ena_gpio_flags, 1490 rdev_get_name(rdev)); 1491 if (ret) 1492 return ret; 1493 1494 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1495 if (pin == NULL) { 1496 gpio_free(config->ena_gpio); 1497 return -ENOMEM; 1498 } 1499 1500 pin->gpio = config->ena_gpio; 1501 pin->ena_gpio_invert = config->ena_gpio_invert; 1502 list_add(&pin->list, ®ulator_ena_gpio_list); 1503 1504update_ena_gpio_to_rdev: 1505 pin->request_count++; 1506 rdev->ena_pin = pin; 1507 return 0; 1508} 1509 1510static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1511{ 1512 struct regulator_enable_gpio *pin, *n; 1513 1514 if (!rdev->ena_pin) 1515 return; 1516 1517 /* Free the GPIO only in case of no use */ 1518 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1519 if (pin->gpio == rdev->ena_pin->gpio) { 1520 if (pin->request_count <= 1) { 1521 pin->request_count = 0; 1522 gpio_free(pin->gpio); 1523 list_del(&pin->list); 1524 kfree(pin); 1525 } else { 1526 pin->request_count--; 1527 } 1528 } 1529 } 1530} 1531 1532/** 1533 * Balance enable_count of each GPIO and actual GPIO pin control. 1534 * GPIO is enabled in case of initial use. (enable_count is 0) 1535 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1536 */ 1537static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1538{ 1539 struct regulator_enable_gpio *pin = rdev->ena_pin; 1540 1541 if (!pin) 1542 return -EINVAL; 1543 1544 if (enable) { 1545 /* Enable GPIO at initial use */ 1546 if (pin->enable_count == 0) 1547 gpio_set_value_cansleep(pin->gpio, 1548 !pin->ena_gpio_invert); 1549 1550 pin->enable_count++; 1551 } else { 1552 if (pin->enable_count > 1) { 1553 pin->enable_count--; 1554 return 0; 1555 } 1556 1557 /* Disable GPIO if not used */ 1558 if (pin->enable_count <= 1) { 1559 gpio_set_value_cansleep(pin->gpio, 1560 pin->ena_gpio_invert); 1561 pin->enable_count = 0; 1562 } 1563 } 1564 1565 return 0; 1566} 1567 1568static int _regulator_do_enable(struct regulator_dev *rdev) 1569{ 1570 int ret, delay; 1571 1572 /* Query before enabling in case configuration dependent. */ 1573 ret = _regulator_get_enable_time(rdev); 1574 if (ret >= 0) { 1575 delay = ret; 1576 } else { 1577 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1578 delay = 0; 1579 } 1580 1581 trace_regulator_enable(rdev_get_name(rdev)); 1582 1583 if (rdev->ena_pin) { 1584 ret = regulator_ena_gpio_ctrl(rdev, true); 1585 if (ret < 0) 1586 return ret; 1587 rdev->ena_gpio_state = 1; 1588 } else if (rdev->desc->ops->enable) { 1589 ret = rdev->desc->ops->enable(rdev); 1590 if (ret < 0) 1591 return ret; 1592 } else { 1593 return -EINVAL; 1594 } 1595 1596 /* Allow the regulator to ramp; it would be useful to extend 1597 * this for bulk operations so that the regulators can ramp 1598 * together. */ 1599 trace_regulator_enable_delay(rdev_get_name(rdev)); 1600 1601 if (delay >= 1000) { 1602 mdelay(delay / 1000); 1603 udelay(delay % 1000); 1604 } else if (delay) { 1605 udelay(delay); 1606 } 1607 1608 trace_regulator_enable_complete(rdev_get_name(rdev)); 1609 1610 return 0; 1611} 1612 1613/* locks held by regulator_enable() */ 1614static int _regulator_enable(struct regulator_dev *rdev) 1615{ 1616 int ret; 1617 1618 /* check voltage and requested load before enabling */ 1619 if (rdev->constraints && 1620 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1621 drms_uA_update(rdev); 1622 1623 if (rdev->use_count == 0) { 1624 /* The regulator may on if it's not switchable or left on */ 1625 ret = _regulator_is_enabled(rdev); 1626 if (ret == -EINVAL || ret == 0) { 1627 if (!_regulator_can_change_status(rdev)) 1628 return -EPERM; 1629 1630 ret = _regulator_do_enable(rdev); 1631 if (ret < 0) 1632 return ret; 1633 1634 } else if (ret < 0) { 1635 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1636 return ret; 1637 } 1638 /* Fallthrough on positive return values - already enabled */ 1639 } 1640 1641 rdev->use_count++; 1642 1643 return 0; 1644} 1645 1646/** 1647 * regulator_enable - enable regulator output 1648 * @regulator: regulator source 1649 * 1650 * Request that the regulator be enabled with the regulator output at 1651 * the predefined voltage or current value. Calls to regulator_enable() 1652 * must be balanced with calls to regulator_disable(). 1653 * 1654 * NOTE: the output value can be set by other drivers, boot loader or may be 1655 * hardwired in the regulator. 1656 */ 1657int regulator_enable(struct regulator *regulator) 1658{ 1659 struct regulator_dev *rdev = regulator->rdev; 1660 int ret = 0; 1661 1662 if (regulator->always_on) 1663 return 0; 1664 1665 if (rdev->supply) { 1666 ret = regulator_enable(rdev->supply); 1667 if (ret != 0) 1668 return ret; 1669 } 1670 1671 mutex_lock(&rdev->mutex); 1672 ret = _regulator_enable(rdev); 1673 mutex_unlock(&rdev->mutex); 1674 1675 if (ret != 0 && rdev->supply) 1676 regulator_disable(rdev->supply); 1677 1678 return ret; 1679} 1680EXPORT_SYMBOL_GPL(regulator_enable); 1681 1682static int _regulator_do_disable(struct regulator_dev *rdev) 1683{ 1684 int ret; 1685 1686 trace_regulator_disable(rdev_get_name(rdev)); 1687 1688 if (rdev->ena_pin) { 1689 ret = regulator_ena_gpio_ctrl(rdev, false); 1690 if (ret < 0) 1691 return ret; 1692 rdev->ena_gpio_state = 0; 1693 1694 } else if (rdev->desc->ops->disable) { 1695 ret = rdev->desc->ops->disable(rdev); 1696 if (ret != 0) 1697 return ret; 1698 } 1699 1700 trace_regulator_disable_complete(rdev_get_name(rdev)); 1701 1702 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1703 NULL); 1704 return 0; 1705} 1706 1707/* locks held by regulator_disable() */ 1708static int _regulator_disable(struct regulator_dev *rdev) 1709{ 1710 int ret = 0; 1711 1712 if (WARN(rdev->use_count <= 0, 1713 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1714 return -EIO; 1715 1716 /* are we the last user and permitted to disable ? */ 1717 if (rdev->use_count == 1 && 1718 (rdev->constraints && !rdev->constraints->always_on)) { 1719 1720 /* we are last user */ 1721 if (_regulator_can_change_status(rdev)) { 1722 ret = _regulator_do_disable(rdev); 1723 if (ret < 0) { 1724 rdev_err(rdev, "failed to disable\n"); 1725 return ret; 1726 } 1727 } 1728 1729 rdev->use_count = 0; 1730 } else if (rdev->use_count > 1) { 1731 1732 if (rdev->constraints && 1733 (rdev->constraints->valid_ops_mask & 1734 REGULATOR_CHANGE_DRMS)) 1735 drms_uA_update(rdev); 1736 1737 rdev->use_count--; 1738 } 1739 1740 return ret; 1741} 1742 1743/** 1744 * regulator_disable - disable regulator output 1745 * @regulator: regulator source 1746 * 1747 * Disable the regulator output voltage or current. Calls to 1748 * regulator_enable() must be balanced with calls to 1749 * regulator_disable(). 1750 * 1751 * NOTE: this will only disable the regulator output if no other consumer 1752 * devices have it enabled, the regulator device supports disabling and 1753 * machine constraints permit this operation. 1754 */ 1755int regulator_disable(struct regulator *regulator) 1756{ 1757 struct regulator_dev *rdev = regulator->rdev; 1758 int ret = 0; 1759 1760 if (regulator->always_on) 1761 return 0; 1762 1763 mutex_lock(&rdev->mutex); 1764 ret = _regulator_disable(rdev); 1765 mutex_unlock(&rdev->mutex); 1766 1767 if (ret == 0 && rdev->supply) 1768 regulator_disable(rdev->supply); 1769 1770 return ret; 1771} 1772EXPORT_SYMBOL_GPL(regulator_disable); 1773 1774/* locks held by regulator_force_disable() */ 1775static int _regulator_force_disable(struct regulator_dev *rdev) 1776{ 1777 int ret = 0; 1778 1779 /* force disable */ 1780 if (rdev->desc->ops->disable) { 1781 /* ah well, who wants to live forever... */ 1782 ret = rdev->desc->ops->disable(rdev); 1783 if (ret < 0) { 1784 rdev_err(rdev, "failed to force disable\n"); 1785 return ret; 1786 } 1787 /* notify other consumers that power has been forced off */ 1788 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1789 REGULATOR_EVENT_DISABLE, NULL); 1790 } 1791 1792 return ret; 1793} 1794 1795/** 1796 * regulator_force_disable - force disable regulator output 1797 * @regulator: regulator source 1798 * 1799 * Forcibly disable the regulator output voltage or current. 1800 * NOTE: this *will* disable the regulator output even if other consumer 1801 * devices have it enabled. This should be used for situations when device 1802 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1803 */ 1804int regulator_force_disable(struct regulator *regulator) 1805{ 1806 struct regulator_dev *rdev = regulator->rdev; 1807 int ret; 1808 1809 mutex_lock(&rdev->mutex); 1810 regulator->uA_load = 0; 1811 ret = _regulator_force_disable(regulator->rdev); 1812 mutex_unlock(&rdev->mutex); 1813 1814 if (rdev->supply) 1815 while (rdev->open_count--) 1816 regulator_disable(rdev->supply); 1817 1818 return ret; 1819} 1820EXPORT_SYMBOL_GPL(regulator_force_disable); 1821 1822static void regulator_disable_work(struct work_struct *work) 1823{ 1824 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1825 disable_work.work); 1826 int count, i, ret; 1827 1828 mutex_lock(&rdev->mutex); 1829 1830 BUG_ON(!rdev->deferred_disables); 1831 1832 count = rdev->deferred_disables; 1833 rdev->deferred_disables = 0; 1834 1835 for (i = 0; i < count; i++) { 1836 ret = _regulator_disable(rdev); 1837 if (ret != 0) 1838 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1839 } 1840 1841 mutex_unlock(&rdev->mutex); 1842 1843 if (rdev->supply) { 1844 for (i = 0; i < count; i++) { 1845 ret = regulator_disable(rdev->supply); 1846 if (ret != 0) { 1847 rdev_err(rdev, 1848 "Supply disable failed: %d\n", ret); 1849 } 1850 } 1851 } 1852} 1853 1854/** 1855 * regulator_disable_deferred - disable regulator output with delay 1856 * @regulator: regulator source 1857 * @ms: miliseconds until the regulator is disabled 1858 * 1859 * Execute regulator_disable() on the regulator after a delay. This 1860 * is intended for use with devices that require some time to quiesce. 1861 * 1862 * NOTE: this will only disable the regulator output if no other consumer 1863 * devices have it enabled, the regulator device supports disabling and 1864 * machine constraints permit this operation. 1865 */ 1866int regulator_disable_deferred(struct regulator *regulator, int ms) 1867{ 1868 struct regulator_dev *rdev = regulator->rdev; 1869 int ret; 1870 1871 if (regulator->always_on) 1872 return 0; 1873 1874 if (!ms) 1875 return regulator_disable(regulator); 1876 1877 mutex_lock(&rdev->mutex); 1878 rdev->deferred_disables++; 1879 mutex_unlock(&rdev->mutex); 1880 1881 ret = schedule_delayed_work(&rdev->disable_work, 1882 msecs_to_jiffies(ms)); 1883 if (ret < 0) 1884 return ret; 1885 else 1886 return 0; 1887} 1888EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1889 1890/** 1891 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1892 * 1893 * @rdev: regulator to operate on 1894 * 1895 * Regulators that use regmap for their register I/O can set the 1896 * enable_reg and enable_mask fields in their descriptor and then use 1897 * this as their is_enabled operation, saving some code. 1898 */ 1899int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1900{ 1901 unsigned int val; 1902 int ret; 1903 1904 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1905 if (ret != 0) 1906 return ret; 1907 1908 return (val & rdev->desc->enable_mask) != 0; 1909} 1910EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1911 1912/** 1913 * regulator_enable_regmap - standard enable() for regmap users 1914 * 1915 * @rdev: regulator to operate on 1916 * 1917 * Regulators that use regmap for their register I/O can set the 1918 * enable_reg and enable_mask fields in their descriptor and then use 1919 * this as their enable() operation, saving some code. 1920 */ 1921int regulator_enable_regmap(struct regulator_dev *rdev) 1922{ 1923 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1924 rdev->desc->enable_mask, 1925 rdev->desc->enable_mask); 1926} 1927EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1928 1929/** 1930 * regulator_disable_regmap - standard disable() for regmap users 1931 * 1932 * @rdev: regulator to operate on 1933 * 1934 * Regulators that use regmap for their register I/O can set the 1935 * enable_reg and enable_mask fields in their descriptor and then use 1936 * this as their disable() operation, saving some code. 1937 */ 1938int regulator_disable_regmap(struct regulator_dev *rdev) 1939{ 1940 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1941 rdev->desc->enable_mask, 0); 1942} 1943EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1944 1945static int _regulator_is_enabled(struct regulator_dev *rdev) 1946{ 1947 /* A GPIO control always takes precedence */ 1948 if (rdev->ena_pin) 1949 return rdev->ena_gpio_state; 1950 1951 /* If we don't know then assume that the regulator is always on */ 1952 if (!rdev->desc->ops->is_enabled) 1953 return 1; 1954 1955 return rdev->desc->ops->is_enabled(rdev); 1956} 1957 1958/** 1959 * regulator_is_enabled - is the regulator output enabled 1960 * @regulator: regulator source 1961 * 1962 * Returns positive if the regulator driver backing the source/client 1963 * has requested that the device be enabled, zero if it hasn't, else a 1964 * negative errno code. 1965 * 1966 * Note that the device backing this regulator handle can have multiple 1967 * users, so it might be enabled even if regulator_enable() was never 1968 * called for this particular source. 1969 */ 1970int regulator_is_enabled(struct regulator *regulator) 1971{ 1972 int ret; 1973 1974 if (regulator->always_on) 1975 return 1; 1976 1977 mutex_lock(®ulator->rdev->mutex); 1978 ret = _regulator_is_enabled(regulator->rdev); 1979 mutex_unlock(®ulator->rdev->mutex); 1980 1981 return ret; 1982} 1983EXPORT_SYMBOL_GPL(regulator_is_enabled); 1984 1985/** 1986 * regulator_can_change_voltage - check if regulator can change voltage 1987 * @regulator: regulator source 1988 * 1989 * Returns positive if the regulator driver backing the source/client 1990 * can change its voltage, false otherwise. Usefull for detecting fixed 1991 * or dummy regulators and disabling voltage change logic in the client 1992 * driver. 1993 */ 1994int regulator_can_change_voltage(struct regulator *regulator) 1995{ 1996 struct regulator_dev *rdev = regulator->rdev; 1997 1998 if (rdev->constraints && 1999 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2000 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2001 return 1; 2002 2003 if (rdev->desc->continuous_voltage_range && 2004 rdev->constraints->min_uV && rdev->constraints->max_uV && 2005 rdev->constraints->min_uV != rdev->constraints->max_uV) 2006 return 1; 2007 } 2008 2009 return 0; 2010} 2011EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2012 2013/** 2014 * regulator_count_voltages - count regulator_list_voltage() selectors 2015 * @regulator: regulator source 2016 * 2017 * Returns number of selectors, or negative errno. Selectors are 2018 * numbered starting at zero, and typically correspond to bitfields 2019 * in hardware registers. 2020 */ 2021int regulator_count_voltages(struct regulator *regulator) 2022{ 2023 struct regulator_dev *rdev = regulator->rdev; 2024 2025 return rdev->desc->n_voltages ? : -EINVAL; 2026} 2027EXPORT_SYMBOL_GPL(regulator_count_voltages); 2028 2029/** 2030 * regulator_list_voltage_linear - List voltages with simple calculation 2031 * 2032 * @rdev: Regulator device 2033 * @selector: Selector to convert into a voltage 2034 * 2035 * Regulators with a simple linear mapping between voltages and 2036 * selectors can set min_uV and uV_step in the regulator descriptor 2037 * and then use this function as their list_voltage() operation, 2038 */ 2039int regulator_list_voltage_linear(struct regulator_dev *rdev, 2040 unsigned int selector) 2041{ 2042 if (selector >= rdev->desc->n_voltages) 2043 return -EINVAL; 2044 if (selector < rdev->desc->linear_min_sel) 2045 return 0; 2046 2047 selector -= rdev->desc->linear_min_sel; 2048 2049 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 2050} 2051EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 2052 2053/** 2054 * regulator_list_voltage_table - List voltages with table based mapping 2055 * 2056 * @rdev: Regulator device 2057 * @selector: Selector to convert into a voltage 2058 * 2059 * Regulators with table based mapping between voltages and 2060 * selectors can set volt_table in the regulator descriptor 2061 * and then use this function as their list_voltage() operation. 2062 */ 2063int regulator_list_voltage_table(struct regulator_dev *rdev, 2064 unsigned int selector) 2065{ 2066 if (!rdev->desc->volt_table) { 2067 BUG_ON(!rdev->desc->volt_table); 2068 return -EINVAL; 2069 } 2070 2071 if (selector >= rdev->desc->n_voltages) 2072 return -EINVAL; 2073 2074 return rdev->desc->volt_table[selector]; 2075} 2076EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 2077 2078/** 2079 * regulator_list_voltage - enumerate supported voltages 2080 * @regulator: regulator source 2081 * @selector: identify voltage to list 2082 * Context: can sleep 2083 * 2084 * Returns a voltage that can be passed to @regulator_set_voltage(), 2085 * zero if this selector code can't be used on this system, or a 2086 * negative errno. 2087 */ 2088int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2089{ 2090 struct regulator_dev *rdev = regulator->rdev; 2091 struct regulator_ops *ops = rdev->desc->ops; 2092 int ret; 2093 2094 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2095 return -EINVAL; 2096 2097 mutex_lock(&rdev->mutex); 2098 ret = ops->list_voltage(rdev, selector); 2099 mutex_unlock(&rdev->mutex); 2100 2101 if (ret > 0) { 2102 if (ret < rdev->constraints->min_uV) 2103 ret = 0; 2104 else if (ret > rdev->constraints->max_uV) 2105 ret = 0; 2106 } 2107 2108 return ret; 2109} 2110EXPORT_SYMBOL_GPL(regulator_list_voltage); 2111 2112/** 2113 * regulator_is_supported_voltage - check if a voltage range can be supported 2114 * 2115 * @regulator: Regulator to check. 2116 * @min_uV: Minimum required voltage in uV. 2117 * @max_uV: Maximum required voltage in uV. 2118 * 2119 * Returns a boolean or a negative error code. 2120 */ 2121int regulator_is_supported_voltage(struct regulator *regulator, 2122 int min_uV, int max_uV) 2123{ 2124 struct regulator_dev *rdev = regulator->rdev; 2125 int i, voltages, ret; 2126 2127 /* If we can't change voltage check the current voltage */ 2128 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2129 ret = regulator_get_voltage(regulator); 2130 if (ret >= 0) 2131 return (min_uV <= ret && ret <= max_uV); 2132 else 2133 return ret; 2134 } 2135 2136 /* Any voltage within constrains range is fine? */ 2137 if (rdev->desc->continuous_voltage_range) 2138 return min_uV >= rdev->constraints->min_uV && 2139 max_uV <= rdev->constraints->max_uV; 2140 2141 ret = regulator_count_voltages(regulator); 2142 if (ret < 0) 2143 return ret; 2144 voltages = ret; 2145 2146 for (i = 0; i < voltages; i++) { 2147 ret = regulator_list_voltage(regulator, i); 2148 2149 if (ret >= min_uV && ret <= max_uV) 2150 return 1; 2151 } 2152 2153 return 0; 2154} 2155EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2156 2157/** 2158 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2159 * 2160 * @rdev: regulator to operate on 2161 * 2162 * Regulators that use regmap for their register I/O can set the 2163 * vsel_reg and vsel_mask fields in their descriptor and then use this 2164 * as their get_voltage_vsel operation, saving some code. 2165 */ 2166int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2167{ 2168 unsigned int val; 2169 int ret; 2170 2171 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2172 if (ret != 0) 2173 return ret; 2174 2175 val &= rdev->desc->vsel_mask; 2176 val >>= ffs(rdev->desc->vsel_mask) - 1; 2177 2178 return val; 2179} 2180EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2181 2182/** 2183 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2184 * 2185 * @rdev: regulator to operate on 2186 * @sel: Selector to set 2187 * 2188 * Regulators that use regmap for their register I/O can set the 2189 * vsel_reg and vsel_mask fields in their descriptor and then use this 2190 * as their set_voltage_vsel operation, saving some code. 2191 */ 2192int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2193{ 2194 int ret; 2195 2196 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2197 2198 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2199 rdev->desc->vsel_mask, sel); 2200 if (ret) 2201 return ret; 2202 2203 if (rdev->desc->apply_bit) 2204 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, 2205 rdev->desc->apply_bit, 2206 rdev->desc->apply_bit); 2207 return ret; 2208} 2209EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2210 2211/** 2212 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2213 * 2214 * @rdev: Regulator to operate on 2215 * @min_uV: Lower bound for voltage 2216 * @max_uV: Upper bound for voltage 2217 * 2218 * Drivers implementing set_voltage_sel() and list_voltage() can use 2219 * this as their map_voltage() operation. It will find a suitable 2220 * voltage by calling list_voltage() until it gets something in bounds 2221 * for the requested voltages. 2222 */ 2223int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2224 int min_uV, int max_uV) 2225{ 2226 int best_val = INT_MAX; 2227 int selector = 0; 2228 int i, ret; 2229 2230 /* Find the smallest voltage that falls within the specified 2231 * range. 2232 */ 2233 for (i = 0; i < rdev->desc->n_voltages; i++) { 2234 ret = rdev->desc->ops->list_voltage(rdev, i); 2235 if (ret < 0) 2236 continue; 2237 2238 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2239 best_val = ret; 2240 selector = i; 2241 } 2242 } 2243 2244 if (best_val != INT_MAX) 2245 return selector; 2246 else 2247 return -EINVAL; 2248} 2249EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2250 2251/** 2252 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2253 * 2254 * @rdev: Regulator to operate on 2255 * @min_uV: Lower bound for voltage 2256 * @max_uV: Upper bound for voltage 2257 * 2258 * Drivers providing min_uV and uV_step in their regulator_desc can 2259 * use this as their map_voltage() operation. 2260 */ 2261int regulator_map_voltage_linear(struct regulator_dev *rdev, 2262 int min_uV, int max_uV) 2263{ 2264 int ret, voltage; 2265 2266 /* Allow uV_step to be 0 for fixed voltage */ 2267 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2268 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2269 return 0; 2270 else 2271 return -EINVAL; 2272 } 2273 2274 if (!rdev->desc->uV_step) { 2275 BUG_ON(!rdev->desc->uV_step); 2276 return -EINVAL; 2277 } 2278 2279 if (min_uV < rdev->desc->min_uV) 2280 min_uV = rdev->desc->min_uV; 2281 2282 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2283 if (ret < 0) 2284 return ret; 2285 2286 ret += rdev->desc->linear_min_sel; 2287 2288 /* Map back into a voltage to verify we're still in bounds */ 2289 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2290 if (voltage < min_uV || voltage > max_uV) 2291 return -EINVAL; 2292 2293 return ret; 2294} 2295EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2296 2297static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2298 int min_uV, int max_uV) 2299{ 2300 int ret; 2301 int delay = 0; 2302 int best_val = 0; 2303 unsigned int selector; 2304 int old_selector = -1; 2305 2306 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2307 2308 min_uV += rdev->constraints->uV_offset; 2309 max_uV += rdev->constraints->uV_offset; 2310 2311 /* 2312 * If we can't obtain the old selector there is not enough 2313 * info to call set_voltage_time_sel(). 2314 */ 2315 if (_regulator_is_enabled(rdev) && 2316 rdev->desc->ops->set_voltage_time_sel && 2317 rdev->desc->ops->get_voltage_sel) { 2318 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2319 if (old_selector < 0) 2320 return old_selector; 2321 } 2322 2323 if (rdev->desc->ops->set_voltage) { 2324 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2325 &selector); 2326 2327 if (ret >= 0) { 2328 if (rdev->desc->ops->list_voltage) 2329 best_val = rdev->desc->ops->list_voltage(rdev, 2330 selector); 2331 else 2332 best_val = _regulator_get_voltage(rdev); 2333 } 2334 2335 } else if (rdev->desc->ops->set_voltage_sel) { 2336 if (rdev->desc->ops->map_voltage) { 2337 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2338 max_uV); 2339 } else { 2340 if (rdev->desc->ops->list_voltage == 2341 regulator_list_voltage_linear) 2342 ret = regulator_map_voltage_linear(rdev, 2343 min_uV, max_uV); 2344 else 2345 ret = regulator_map_voltage_iterate(rdev, 2346 min_uV, max_uV); 2347 } 2348 2349 if (ret >= 0) { 2350 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2351 if (min_uV <= best_val && max_uV >= best_val) { 2352 selector = ret; 2353 if (old_selector == selector) 2354 ret = 0; 2355 else 2356 ret = rdev->desc->ops->set_voltage_sel( 2357 rdev, ret); 2358 } else { 2359 ret = -EINVAL; 2360 } 2361 } 2362 } else { 2363 ret = -EINVAL; 2364 } 2365 2366 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2367 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2368 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { 2369 2370 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2371 old_selector, selector); 2372 if (delay < 0) { 2373 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2374 delay); 2375 delay = 0; 2376 } 2377 2378 /* Insert any necessary delays */ 2379 if (delay >= 1000) { 2380 mdelay(delay / 1000); 2381 udelay(delay % 1000); 2382 } else if (delay) { 2383 udelay(delay); 2384 } 2385 } 2386 2387 if (ret == 0 && best_val >= 0) { 2388 unsigned long data = best_val; 2389 2390 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2391 (void *)data); 2392 } 2393 2394 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2395 2396 return ret; 2397} 2398 2399/** 2400 * regulator_set_voltage - set regulator output voltage 2401 * @regulator: regulator source 2402 * @min_uV: Minimum required voltage in uV 2403 * @max_uV: Maximum acceptable voltage in uV 2404 * 2405 * Sets a voltage regulator to the desired output voltage. This can be set 2406 * during any regulator state. IOW, regulator can be disabled or enabled. 2407 * 2408 * If the regulator is enabled then the voltage will change to the new value 2409 * immediately otherwise if the regulator is disabled the regulator will 2410 * output at the new voltage when enabled. 2411 * 2412 * NOTE: If the regulator is shared between several devices then the lowest 2413 * request voltage that meets the system constraints will be used. 2414 * Regulator system constraints must be set for this regulator before 2415 * calling this function otherwise this call will fail. 2416 */ 2417int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2418{ 2419 struct regulator_dev *rdev = regulator->rdev; 2420 int ret = 0; 2421 int old_min_uV, old_max_uV; 2422 2423 mutex_lock(&rdev->mutex); 2424 2425 /* If we're setting the same range as last time the change 2426 * should be a noop (some cpufreq implementations use the same 2427 * voltage for multiple frequencies, for example). 2428 */ 2429 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2430 goto out; 2431 2432 /* sanity check */ 2433 if (!rdev->desc->ops->set_voltage && 2434 !rdev->desc->ops->set_voltage_sel) { 2435 ret = -EINVAL; 2436 goto out; 2437 } 2438 2439 /* constraints check */ 2440 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2441 if (ret < 0) 2442 goto out; 2443 2444 /* restore original values in case of error */ 2445 old_min_uV = regulator->min_uV; 2446 old_max_uV = regulator->max_uV; 2447 regulator->min_uV = min_uV; 2448 regulator->max_uV = max_uV; 2449 2450 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2451 if (ret < 0) 2452 goto out2; 2453 2454 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2455 if (ret < 0) 2456 goto out2; 2457 2458out: 2459 mutex_unlock(&rdev->mutex); 2460 return ret; 2461out2: 2462 regulator->min_uV = old_min_uV; 2463 regulator->max_uV = old_max_uV; 2464 mutex_unlock(&rdev->mutex); 2465 return ret; 2466} 2467EXPORT_SYMBOL_GPL(regulator_set_voltage); 2468 2469/** 2470 * regulator_set_voltage_time - get raise/fall time 2471 * @regulator: regulator source 2472 * @old_uV: starting voltage in microvolts 2473 * @new_uV: target voltage in microvolts 2474 * 2475 * Provided with the starting and ending voltage, this function attempts to 2476 * calculate the time in microseconds required to rise or fall to this new 2477 * voltage. 2478 */ 2479int regulator_set_voltage_time(struct regulator *regulator, 2480 int old_uV, int new_uV) 2481{ 2482 struct regulator_dev *rdev = regulator->rdev; 2483 struct regulator_ops *ops = rdev->desc->ops; 2484 int old_sel = -1; 2485 int new_sel = -1; 2486 int voltage; 2487 int i; 2488 2489 /* Currently requires operations to do this */ 2490 if (!ops->list_voltage || !ops->set_voltage_time_sel 2491 || !rdev->desc->n_voltages) 2492 return -EINVAL; 2493 2494 for (i = 0; i < rdev->desc->n_voltages; i++) { 2495 /* We only look for exact voltage matches here */ 2496 voltage = regulator_list_voltage(regulator, i); 2497 if (voltage < 0) 2498 return -EINVAL; 2499 if (voltage == 0) 2500 continue; 2501 if (voltage == old_uV) 2502 old_sel = i; 2503 if (voltage == new_uV) 2504 new_sel = i; 2505 } 2506 2507 if (old_sel < 0 || new_sel < 0) 2508 return -EINVAL; 2509 2510 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2511} 2512EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2513 2514/** 2515 * regulator_set_voltage_time_sel - get raise/fall time 2516 * @rdev: regulator source device 2517 * @old_selector: selector for starting voltage 2518 * @new_selector: selector for target voltage 2519 * 2520 * Provided with the starting and target voltage selectors, this function 2521 * returns time in microseconds required to rise or fall to this new voltage 2522 * 2523 * Drivers providing ramp_delay in regulation_constraints can use this as their 2524 * set_voltage_time_sel() operation. 2525 */ 2526int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2527 unsigned int old_selector, 2528 unsigned int new_selector) 2529{ 2530 unsigned int ramp_delay = 0; 2531 int old_volt, new_volt; 2532 2533 if (rdev->constraints->ramp_delay) 2534 ramp_delay = rdev->constraints->ramp_delay; 2535 else if (rdev->desc->ramp_delay) 2536 ramp_delay = rdev->desc->ramp_delay; 2537 2538 if (ramp_delay == 0) { 2539 rdev_warn(rdev, "ramp_delay not set\n"); 2540 return 0; 2541 } 2542 2543 /* sanity check */ 2544 if (!rdev->desc->ops->list_voltage) 2545 return -EINVAL; 2546 2547 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2548 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2549 2550 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2551} 2552EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2553 2554/** 2555 * regulator_sync_voltage - re-apply last regulator output voltage 2556 * @regulator: regulator source 2557 * 2558 * Re-apply the last configured voltage. This is intended to be used 2559 * where some external control source the consumer is cooperating with 2560 * has caused the configured voltage to change. 2561 */ 2562int regulator_sync_voltage(struct regulator *regulator) 2563{ 2564 struct regulator_dev *rdev = regulator->rdev; 2565 int ret, min_uV, max_uV; 2566 2567 mutex_lock(&rdev->mutex); 2568 2569 if (!rdev->desc->ops->set_voltage && 2570 !rdev->desc->ops->set_voltage_sel) { 2571 ret = -EINVAL; 2572 goto out; 2573 } 2574 2575 /* This is only going to work if we've had a voltage configured. */ 2576 if (!regulator->min_uV && !regulator->max_uV) { 2577 ret = -EINVAL; 2578 goto out; 2579 } 2580 2581 min_uV = regulator->min_uV; 2582 max_uV = regulator->max_uV; 2583 2584 /* This should be a paranoia check... */ 2585 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2586 if (ret < 0) 2587 goto out; 2588 2589 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2590 if (ret < 0) 2591 goto out; 2592 2593 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2594 2595out: 2596 mutex_unlock(&rdev->mutex); 2597 return ret; 2598} 2599EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2600 2601static int _regulator_get_voltage(struct regulator_dev *rdev) 2602{ 2603 int sel, ret; 2604 2605 if (rdev->desc->ops->get_voltage_sel) { 2606 sel = rdev->desc->ops->get_voltage_sel(rdev); 2607 if (sel < 0) 2608 return sel; 2609 ret = rdev->desc->ops->list_voltage(rdev, sel); 2610 } else if (rdev->desc->ops->get_voltage) { 2611 ret = rdev->desc->ops->get_voltage(rdev); 2612 } else if (rdev->desc->ops->list_voltage) { 2613 ret = rdev->desc->ops->list_voltage(rdev, 0); 2614 } else { 2615 return -EINVAL; 2616 } 2617 2618 if (ret < 0) 2619 return ret; 2620 return ret - rdev->constraints->uV_offset; 2621} 2622 2623/** 2624 * regulator_get_voltage - get regulator output voltage 2625 * @regulator: regulator source 2626 * 2627 * This returns the current regulator voltage in uV. 2628 * 2629 * NOTE: If the regulator is disabled it will return the voltage value. This 2630 * function should not be used to determine regulator state. 2631 */ 2632int regulator_get_voltage(struct regulator *regulator) 2633{ 2634 int ret; 2635 2636 mutex_lock(®ulator->rdev->mutex); 2637 2638 ret = _regulator_get_voltage(regulator->rdev); 2639 2640 mutex_unlock(®ulator->rdev->mutex); 2641 2642 return ret; 2643} 2644EXPORT_SYMBOL_GPL(regulator_get_voltage); 2645 2646/** 2647 * regulator_set_current_limit - set regulator output current limit 2648 * @regulator: regulator source 2649 * @min_uA: Minimuum supported current in uA 2650 * @max_uA: Maximum supported current in uA 2651 * 2652 * Sets current sink to the desired output current. This can be set during 2653 * any regulator state. IOW, regulator can be disabled or enabled. 2654 * 2655 * If the regulator is enabled then the current will change to the new value 2656 * immediately otherwise if the regulator is disabled the regulator will 2657 * output at the new current when enabled. 2658 * 2659 * NOTE: Regulator system constraints must be set for this regulator before 2660 * calling this function otherwise this call will fail. 2661 */ 2662int regulator_set_current_limit(struct regulator *regulator, 2663 int min_uA, int max_uA) 2664{ 2665 struct regulator_dev *rdev = regulator->rdev; 2666 int ret; 2667 2668 mutex_lock(&rdev->mutex); 2669 2670 /* sanity check */ 2671 if (!rdev->desc->ops->set_current_limit) { 2672 ret = -EINVAL; 2673 goto out; 2674 } 2675 2676 /* constraints check */ 2677 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2678 if (ret < 0) 2679 goto out; 2680 2681 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2682out: 2683 mutex_unlock(&rdev->mutex); 2684 return ret; 2685} 2686EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2687 2688static int _regulator_get_current_limit(struct regulator_dev *rdev) 2689{ 2690 int ret; 2691 2692 mutex_lock(&rdev->mutex); 2693 2694 /* sanity check */ 2695 if (!rdev->desc->ops->get_current_limit) { 2696 ret = -EINVAL; 2697 goto out; 2698 } 2699 2700 ret = rdev->desc->ops->get_current_limit(rdev); 2701out: 2702 mutex_unlock(&rdev->mutex); 2703 return ret; 2704} 2705 2706/** 2707 * regulator_get_current_limit - get regulator output current 2708 * @regulator: regulator source 2709 * 2710 * This returns the current supplied by the specified current sink in uA. 2711 * 2712 * NOTE: If the regulator is disabled it will return the current value. This 2713 * function should not be used to determine regulator state. 2714 */ 2715int regulator_get_current_limit(struct regulator *regulator) 2716{ 2717 return _regulator_get_current_limit(regulator->rdev); 2718} 2719EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2720 2721/** 2722 * regulator_set_mode - set regulator operating mode 2723 * @regulator: regulator source 2724 * @mode: operating mode - one of the REGULATOR_MODE constants 2725 * 2726 * Set regulator operating mode to increase regulator efficiency or improve 2727 * regulation performance. 2728 * 2729 * NOTE: Regulator system constraints must be set for this regulator before 2730 * calling this function otherwise this call will fail. 2731 */ 2732int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2733{ 2734 struct regulator_dev *rdev = regulator->rdev; 2735 int ret; 2736 int regulator_curr_mode; 2737 2738 mutex_lock(&rdev->mutex); 2739 2740 /* sanity check */ 2741 if (!rdev->desc->ops->set_mode) { 2742 ret = -EINVAL; 2743 goto out; 2744 } 2745 2746 /* return if the same mode is requested */ 2747 if (rdev->desc->ops->get_mode) { 2748 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2749 if (regulator_curr_mode == mode) { 2750 ret = 0; 2751 goto out; 2752 } 2753 } 2754 2755 /* constraints check */ 2756 ret = regulator_mode_constrain(rdev, &mode); 2757 if (ret < 0) 2758 goto out; 2759 2760 ret = rdev->desc->ops->set_mode(rdev, mode); 2761out: 2762 mutex_unlock(&rdev->mutex); 2763 return ret; 2764} 2765EXPORT_SYMBOL_GPL(regulator_set_mode); 2766 2767static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2768{ 2769 int ret; 2770 2771 mutex_lock(&rdev->mutex); 2772 2773 /* sanity check */ 2774 if (!rdev->desc->ops->get_mode) { 2775 ret = -EINVAL; 2776 goto out; 2777 } 2778 2779 ret = rdev->desc->ops->get_mode(rdev); 2780out: 2781 mutex_unlock(&rdev->mutex); 2782 return ret; 2783} 2784 2785/** 2786 * regulator_get_mode - get regulator operating mode 2787 * @regulator: regulator source 2788 * 2789 * Get the current regulator operating mode. 2790 */ 2791unsigned int regulator_get_mode(struct regulator *regulator) 2792{ 2793 return _regulator_get_mode(regulator->rdev); 2794} 2795EXPORT_SYMBOL_GPL(regulator_get_mode); 2796 2797/** 2798 * regulator_set_optimum_mode - set regulator optimum operating mode 2799 * @regulator: regulator source 2800 * @uA_load: load current 2801 * 2802 * Notifies the regulator core of a new device load. This is then used by 2803 * DRMS (if enabled by constraints) to set the most efficient regulator 2804 * operating mode for the new regulator loading. 2805 * 2806 * Consumer devices notify their supply regulator of the maximum power 2807 * they will require (can be taken from device datasheet in the power 2808 * consumption tables) when they change operational status and hence power 2809 * state. Examples of operational state changes that can affect power 2810 * consumption are :- 2811 * 2812 * o Device is opened / closed. 2813 * o Device I/O is about to begin or has just finished. 2814 * o Device is idling in between work. 2815 * 2816 * This information is also exported via sysfs to userspace. 2817 * 2818 * DRMS will sum the total requested load on the regulator and change 2819 * to the most efficient operating mode if platform constraints allow. 2820 * 2821 * Returns the new regulator mode or error. 2822 */ 2823int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2824{ 2825 struct regulator_dev *rdev = regulator->rdev; 2826 struct regulator *consumer; 2827 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2828 unsigned int mode; 2829 2830 if (rdev->supply) 2831 input_uV = regulator_get_voltage(rdev->supply); 2832 2833 mutex_lock(&rdev->mutex); 2834 2835 /* 2836 * first check to see if we can set modes at all, otherwise just 2837 * tell the consumer everything is OK. 2838 */ 2839 regulator->uA_load = uA_load; 2840 ret = regulator_check_drms(rdev); 2841 if (ret < 0) { 2842 ret = 0; 2843 goto out; 2844 } 2845 2846 if (!rdev->desc->ops->get_optimum_mode) 2847 goto out; 2848 2849 /* 2850 * we can actually do this so any errors are indicators of 2851 * potential real failure. 2852 */ 2853 ret = -EINVAL; 2854 2855 if (!rdev->desc->ops->set_mode) 2856 goto out; 2857 2858 /* get output voltage */ 2859 output_uV = _regulator_get_voltage(rdev); 2860 if (output_uV <= 0) { 2861 rdev_err(rdev, "invalid output voltage found\n"); 2862 goto out; 2863 } 2864 2865 /* No supply? Use constraint voltage */ 2866 if (input_uV <= 0) 2867 input_uV = rdev->constraints->input_uV; 2868 if (input_uV <= 0) { 2869 rdev_err(rdev, "invalid input voltage found\n"); 2870 goto out; 2871 } 2872 2873 /* calc total requested load for this regulator */ 2874 list_for_each_entry(consumer, &rdev->consumer_list, list) 2875 total_uA_load += consumer->uA_load; 2876 2877 mode = rdev->desc->ops->get_optimum_mode(rdev, 2878 input_uV, output_uV, 2879 total_uA_load); 2880 ret = regulator_mode_constrain(rdev, &mode); 2881 if (ret < 0) { 2882 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2883 total_uA_load, input_uV, output_uV); 2884 goto out; 2885 } 2886 2887 ret = rdev->desc->ops->set_mode(rdev, mode); 2888 if (ret < 0) { 2889 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2890 goto out; 2891 } 2892 ret = mode; 2893out: 2894 mutex_unlock(&rdev->mutex); 2895 return ret; 2896} 2897EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2898 2899/** 2900 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2901 * 2902 * @rdev: device to operate on. 2903 * @enable: state to set. 2904 */ 2905int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2906{ 2907 unsigned int val; 2908 2909 if (enable) 2910 val = rdev->desc->bypass_mask; 2911 else 2912 val = 0; 2913 2914 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2915 rdev->desc->bypass_mask, val); 2916} 2917EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2918 2919/** 2920 * regulator_get_bypass_regmap - Default get_bypass() using regmap 2921 * 2922 * @rdev: device to operate on. 2923 * @enable: current state. 2924 */ 2925int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 2926{ 2927 unsigned int val; 2928 int ret; 2929 2930 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 2931 if (ret != 0) 2932 return ret; 2933 2934 *enable = val & rdev->desc->bypass_mask; 2935 2936 return 0; 2937} 2938EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 2939 2940/** 2941 * regulator_allow_bypass - allow the regulator to go into bypass mode 2942 * 2943 * @regulator: Regulator to configure 2944 * @allow: enable or disable bypass mode 2945 * 2946 * Allow the regulator to go into bypass mode if all other consumers 2947 * for the regulator also enable bypass mode and the machine 2948 * constraints allow this. Bypass mode means that the regulator is 2949 * simply passing the input directly to the output with no regulation. 2950 */ 2951int regulator_allow_bypass(struct regulator *regulator, bool enable) 2952{ 2953 struct regulator_dev *rdev = regulator->rdev; 2954 int ret = 0; 2955 2956 if (!rdev->desc->ops->set_bypass) 2957 return 0; 2958 2959 if (rdev->constraints && 2960 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2961 return 0; 2962 2963 mutex_lock(&rdev->mutex); 2964 2965 if (enable && !regulator->bypass) { 2966 rdev->bypass_count++; 2967 2968 if (rdev->bypass_count == rdev->open_count) { 2969 ret = rdev->desc->ops->set_bypass(rdev, enable); 2970 if (ret != 0) 2971 rdev->bypass_count--; 2972 } 2973 2974 } else if (!enable && regulator->bypass) { 2975 rdev->bypass_count--; 2976 2977 if (rdev->bypass_count != rdev->open_count) { 2978 ret = rdev->desc->ops->set_bypass(rdev, enable); 2979 if (ret != 0) 2980 rdev->bypass_count++; 2981 } 2982 } 2983 2984 if (ret == 0) 2985 regulator->bypass = enable; 2986 2987 mutex_unlock(&rdev->mutex); 2988 2989 return ret; 2990} 2991EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2992 2993/** 2994 * regulator_register_notifier - register regulator event notifier 2995 * @regulator: regulator source 2996 * @nb: notifier block 2997 * 2998 * Register notifier block to receive regulator events. 2999 */ 3000int regulator_register_notifier(struct regulator *regulator, 3001 struct notifier_block *nb) 3002{ 3003 return blocking_notifier_chain_register(®ulator->rdev->notifier, 3004 nb); 3005} 3006EXPORT_SYMBOL_GPL(regulator_register_notifier); 3007 3008/** 3009 * regulator_unregister_notifier - unregister regulator event notifier 3010 * @regulator: regulator source 3011 * @nb: notifier block 3012 * 3013 * Unregister regulator event notifier block. 3014 */ 3015int regulator_unregister_notifier(struct regulator *regulator, 3016 struct notifier_block *nb) 3017{ 3018 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 3019 nb); 3020} 3021EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 3022 3023/* notify regulator consumers and downstream regulator consumers. 3024 * Note mutex must be held by caller. 3025 */ 3026static void _notifier_call_chain(struct regulator_dev *rdev, 3027 unsigned long event, void *data) 3028{ 3029 /* call rdev chain first */ 3030 blocking_notifier_call_chain(&rdev->notifier, event, data); 3031} 3032 3033/** 3034 * regulator_bulk_get - get multiple regulator consumers 3035 * 3036 * @dev: Device to supply 3037 * @num_consumers: Number of consumers to register 3038 * @consumers: Configuration of consumers; clients are stored here. 3039 * 3040 * @return 0 on success, an errno on failure. 3041 * 3042 * This helper function allows drivers to get several regulator 3043 * consumers in one operation. If any of the regulators cannot be 3044 * acquired then any regulators that were allocated will be freed 3045 * before returning to the caller. 3046 */ 3047int regulator_bulk_get(struct device *dev, int num_consumers, 3048 struct regulator_bulk_data *consumers) 3049{ 3050 int i; 3051 int ret; 3052 3053 for (i = 0; i < num_consumers; i++) 3054 consumers[i].consumer = NULL; 3055 3056 for (i = 0; i < num_consumers; i++) { 3057 consumers[i].consumer = regulator_get(dev, 3058 consumers[i].supply); 3059 if (IS_ERR(consumers[i].consumer)) { 3060 ret = PTR_ERR(consumers[i].consumer); 3061 dev_err(dev, "Failed to get supply '%s': %d\n", 3062 consumers[i].supply, ret); 3063 consumers[i].consumer = NULL; 3064 goto err; 3065 } 3066 } 3067 3068 return 0; 3069 3070err: 3071 while (--i >= 0) 3072 regulator_put(consumers[i].consumer); 3073 3074 return ret; 3075} 3076EXPORT_SYMBOL_GPL(regulator_bulk_get); 3077 3078/** 3079 * devm_regulator_bulk_get - managed get multiple regulator consumers 3080 * 3081 * @dev: Device to supply 3082 * @num_consumers: Number of consumers to register 3083 * @consumers: Configuration of consumers; clients are stored here. 3084 * 3085 * @return 0 on success, an errno on failure. 3086 * 3087 * This helper function allows drivers to get several regulator 3088 * consumers in one operation with management, the regulators will 3089 * automatically be freed when the device is unbound. If any of the 3090 * regulators cannot be acquired then any regulators that were 3091 * allocated will be freed before returning to the caller. 3092 */ 3093int devm_regulator_bulk_get(struct device *dev, int num_consumers, 3094 struct regulator_bulk_data *consumers) 3095{ 3096 int i; 3097 int ret; 3098 3099 for (i = 0; i < num_consumers; i++) 3100 consumers[i].consumer = NULL; 3101 3102 for (i = 0; i < num_consumers; i++) { 3103 consumers[i].consumer = devm_regulator_get(dev, 3104 consumers[i].supply); 3105 if (IS_ERR(consumers[i].consumer)) { 3106 ret = PTR_ERR(consumers[i].consumer); 3107 dev_err(dev, "Failed to get supply '%s': %d\n", 3108 consumers[i].supply, ret); 3109 consumers[i].consumer = NULL; 3110 goto err; 3111 } 3112 } 3113 3114 return 0; 3115 3116err: 3117 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 3118 devm_regulator_put(consumers[i].consumer); 3119 3120 return ret; 3121} 3122EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 3123 3124static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3125{ 3126 struct regulator_bulk_data *bulk = data; 3127 3128 bulk->ret = regulator_enable(bulk->consumer); 3129} 3130 3131/** 3132 * regulator_bulk_enable - enable multiple regulator consumers 3133 * 3134 * @num_consumers: Number of consumers 3135 * @consumers: Consumer data; clients are stored here. 3136 * @return 0 on success, an errno on failure 3137 * 3138 * This convenience API allows consumers to enable multiple regulator 3139 * clients in a single API call. If any consumers cannot be enabled 3140 * then any others that were enabled will be disabled again prior to 3141 * return. 3142 */ 3143int regulator_bulk_enable(int num_consumers, 3144 struct regulator_bulk_data *consumers) 3145{ 3146 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3147 int i; 3148 int ret = 0; 3149 3150 for (i = 0; i < num_consumers; i++) { 3151 if (consumers[i].consumer->always_on) 3152 consumers[i].ret = 0; 3153 else 3154 async_schedule_domain(regulator_bulk_enable_async, 3155 &consumers[i], &async_domain); 3156 } 3157 3158 async_synchronize_full_domain(&async_domain); 3159 3160 /* If any consumer failed we need to unwind any that succeeded */ 3161 for (i = 0; i < num_consumers; i++) { 3162 if (consumers[i].ret != 0) { 3163 ret = consumers[i].ret; 3164 goto err; 3165 } 3166 } 3167 3168 return 0; 3169 3170err: 3171 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 3172 while (--i >= 0) 3173 regulator_disable(consumers[i].consumer); 3174 3175 return ret; 3176} 3177EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3178 3179/** 3180 * regulator_bulk_disable - disable multiple regulator consumers 3181 * 3182 * @num_consumers: Number of consumers 3183 * @consumers: Consumer data; clients are stored here. 3184 * @return 0 on success, an errno on failure 3185 * 3186 * This convenience API allows consumers to disable multiple regulator 3187 * clients in a single API call. If any consumers cannot be disabled 3188 * then any others that were disabled will be enabled again prior to 3189 * return. 3190 */ 3191int regulator_bulk_disable(int num_consumers, 3192 struct regulator_bulk_data *consumers) 3193{ 3194 int i; 3195 int ret, r; 3196 3197 for (i = num_consumers - 1; i >= 0; --i) { 3198 ret = regulator_disable(consumers[i].consumer); 3199 if (ret != 0) 3200 goto err; 3201 } 3202 3203 return 0; 3204 3205err: 3206 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3207 for (++i; i < num_consumers; ++i) { 3208 r = regulator_enable(consumers[i].consumer); 3209 if (r != 0) 3210 pr_err("Failed to reename %s: %d\n", 3211 consumers[i].supply, r); 3212 } 3213 3214 return ret; 3215} 3216EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3217 3218/** 3219 * regulator_bulk_force_disable - force disable multiple regulator consumers 3220 * 3221 * @num_consumers: Number of consumers 3222 * @consumers: Consumer data; clients are stored here. 3223 * @return 0 on success, an errno on failure 3224 * 3225 * This convenience API allows consumers to forcibly disable multiple regulator 3226 * clients in a single API call. 3227 * NOTE: This should be used for situations when device damage will 3228 * likely occur if the regulators are not disabled (e.g. over temp). 3229 * Although regulator_force_disable function call for some consumers can 3230 * return error numbers, the function is called for all consumers. 3231 */ 3232int regulator_bulk_force_disable(int num_consumers, 3233 struct regulator_bulk_data *consumers) 3234{ 3235 int i; 3236 int ret; 3237 3238 for (i = 0; i < num_consumers; i++) 3239 consumers[i].ret = 3240 regulator_force_disable(consumers[i].consumer); 3241 3242 for (i = 0; i < num_consumers; i++) { 3243 if (consumers[i].ret != 0) { 3244 ret = consumers[i].ret; 3245 goto out; 3246 } 3247 } 3248 3249 return 0; 3250out: 3251 return ret; 3252} 3253EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3254 3255/** 3256 * regulator_bulk_free - free multiple regulator consumers 3257 * 3258 * @num_consumers: Number of consumers 3259 * @consumers: Consumer data; clients are stored here. 3260 * 3261 * This convenience API allows consumers to free multiple regulator 3262 * clients in a single API call. 3263 */ 3264void regulator_bulk_free(int num_consumers, 3265 struct regulator_bulk_data *consumers) 3266{ 3267 int i; 3268 3269 for (i = 0; i < num_consumers; i++) { 3270 regulator_put(consumers[i].consumer); 3271 consumers[i].consumer = NULL; 3272 } 3273} 3274EXPORT_SYMBOL_GPL(regulator_bulk_free); 3275 3276/** 3277 * regulator_notifier_call_chain - call regulator event notifier 3278 * @rdev: regulator source 3279 * @event: notifier block 3280 * @data: callback-specific data. 3281 * 3282 * Called by regulator drivers to notify clients a regulator event has 3283 * occurred. We also notify regulator clients downstream. 3284 * Note lock must be held by caller. 3285 */ 3286int regulator_notifier_call_chain(struct regulator_dev *rdev, 3287 unsigned long event, void *data) 3288{ 3289 _notifier_call_chain(rdev, event, data); 3290 return NOTIFY_DONE; 3291 3292} 3293EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3294 3295/** 3296 * regulator_mode_to_status - convert a regulator mode into a status 3297 * 3298 * @mode: Mode to convert 3299 * 3300 * Convert a regulator mode into a status. 3301 */ 3302int regulator_mode_to_status(unsigned int mode) 3303{ 3304 switch (mode) { 3305 case REGULATOR_MODE_FAST: 3306 return REGULATOR_STATUS_FAST; 3307 case REGULATOR_MODE_NORMAL: 3308 return REGULATOR_STATUS_NORMAL; 3309 case REGULATOR_MODE_IDLE: 3310 return REGULATOR_STATUS_IDLE; 3311 case REGULATOR_MODE_STANDBY: 3312 return REGULATOR_STATUS_STANDBY; 3313 default: 3314 return REGULATOR_STATUS_UNDEFINED; 3315 } 3316} 3317EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3318 3319/* 3320 * To avoid cluttering sysfs (and memory) with useless state, only 3321 * create attributes that can be meaningfully displayed. 3322 */ 3323static int add_regulator_attributes(struct regulator_dev *rdev) 3324{ 3325 struct device *dev = &rdev->dev; 3326 struct regulator_ops *ops = rdev->desc->ops; 3327 int status = 0; 3328 3329 /* some attributes need specific methods to be displayed */ 3330 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3331 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3332 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3333 status = device_create_file(dev, &dev_attr_microvolts); 3334 if (status < 0) 3335 return status; 3336 } 3337 if (ops->get_current_limit) { 3338 status = device_create_file(dev, &dev_attr_microamps); 3339 if (status < 0) 3340 return status; 3341 } 3342 if (ops->get_mode) { 3343 status = device_create_file(dev, &dev_attr_opmode); 3344 if (status < 0) 3345 return status; 3346 } 3347 if (rdev->ena_pin || ops->is_enabled) { 3348 status = device_create_file(dev, &dev_attr_state); 3349 if (status < 0) 3350 return status; 3351 } 3352 if (ops->get_status) { 3353 status = device_create_file(dev, &dev_attr_status); 3354 if (status < 0) 3355 return status; 3356 } 3357 if (ops->get_bypass) { 3358 status = device_create_file(dev, &dev_attr_bypass); 3359 if (status < 0) 3360 return status; 3361 } 3362 3363 /* some attributes are type-specific */ 3364 if (rdev->desc->type == REGULATOR_CURRENT) { 3365 status = device_create_file(dev, &dev_attr_requested_microamps); 3366 if (status < 0) 3367 return status; 3368 } 3369 3370 /* all the other attributes exist to support constraints; 3371 * don't show them if there are no constraints, or if the 3372 * relevant supporting methods are missing. 3373 */ 3374 if (!rdev->constraints) 3375 return status; 3376 3377 /* constraints need specific supporting methods */ 3378 if (ops->set_voltage || ops->set_voltage_sel) { 3379 status = device_create_file(dev, &dev_attr_min_microvolts); 3380 if (status < 0) 3381 return status; 3382 status = device_create_file(dev, &dev_attr_max_microvolts); 3383 if (status < 0) 3384 return status; 3385 } 3386 if (ops->set_current_limit) { 3387 status = device_create_file(dev, &dev_attr_min_microamps); 3388 if (status < 0) 3389 return status; 3390 status = device_create_file(dev, &dev_attr_max_microamps); 3391 if (status < 0) 3392 return status; 3393 } 3394 3395 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3396 if (status < 0) 3397 return status; 3398 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3399 if (status < 0) 3400 return status; 3401 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3402 if (status < 0) 3403 return status; 3404 3405 if (ops->set_suspend_voltage) { 3406 status = device_create_file(dev, 3407 &dev_attr_suspend_standby_microvolts); 3408 if (status < 0) 3409 return status; 3410 status = device_create_file(dev, 3411 &dev_attr_suspend_mem_microvolts); 3412 if (status < 0) 3413 return status; 3414 status = device_create_file(dev, 3415 &dev_attr_suspend_disk_microvolts); 3416 if (status < 0) 3417 return status; 3418 } 3419 3420 if (ops->set_suspend_mode) { 3421 status = device_create_file(dev, 3422 &dev_attr_suspend_standby_mode); 3423 if (status < 0) 3424 return status; 3425 status = device_create_file(dev, 3426 &dev_attr_suspend_mem_mode); 3427 if (status < 0) 3428 return status; 3429 status = device_create_file(dev, 3430 &dev_attr_suspend_disk_mode); 3431 if (status < 0) 3432 return status; 3433 } 3434 3435 return status; 3436} 3437 3438static void rdev_init_debugfs(struct regulator_dev *rdev) 3439{ 3440 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3441 if (!rdev->debugfs) { 3442 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3443 return; 3444 } 3445 3446 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3447 &rdev->use_count); 3448 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3449 &rdev->open_count); 3450 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3451 &rdev->bypass_count); 3452} 3453 3454/** 3455 * regulator_register - register regulator 3456 * @regulator_desc: regulator to register 3457 * @config: runtime configuration for regulator 3458 * 3459 * Called by regulator drivers to register a regulator. 3460 * Returns a valid pointer to struct regulator_dev on success 3461 * or an ERR_PTR() on error. 3462 */ 3463struct regulator_dev * 3464regulator_register(const struct regulator_desc *regulator_desc, 3465 const struct regulator_config *config) 3466{ 3467 const struct regulation_constraints *constraints = NULL; 3468 const struct regulator_init_data *init_data; 3469 static atomic_t regulator_no = ATOMIC_INIT(0); 3470 struct regulator_dev *rdev; 3471 struct device *dev; 3472 int ret, i; 3473 const char *supply = NULL; 3474 3475 if (regulator_desc == NULL || config == NULL) 3476 return ERR_PTR(-EINVAL); 3477 3478 dev = config->dev; 3479 WARN_ON(!dev); 3480 3481 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3482 return ERR_PTR(-EINVAL); 3483 3484 if (regulator_desc->type != REGULATOR_VOLTAGE && 3485 regulator_desc->type != REGULATOR_CURRENT) 3486 return ERR_PTR(-EINVAL); 3487 3488 /* Only one of each should be implemented */ 3489 WARN_ON(regulator_desc->ops->get_voltage && 3490 regulator_desc->ops->get_voltage_sel); 3491 WARN_ON(regulator_desc->ops->set_voltage && 3492 regulator_desc->ops->set_voltage_sel); 3493 3494 /* If we're using selectors we must implement list_voltage. */ 3495 if (regulator_desc->ops->get_voltage_sel && 3496 !regulator_desc->ops->list_voltage) { 3497 return ERR_PTR(-EINVAL); 3498 } 3499 if (regulator_desc->ops->set_voltage_sel && 3500 !regulator_desc->ops->list_voltage) { 3501 return ERR_PTR(-EINVAL); 3502 } 3503 3504 init_data = config->init_data; 3505 3506 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3507 if (rdev == NULL) 3508 return ERR_PTR(-ENOMEM); 3509 3510 mutex_lock(®ulator_list_mutex); 3511 3512 mutex_init(&rdev->mutex); 3513 rdev->reg_data = config->driver_data; 3514 rdev->owner = regulator_desc->owner; 3515 rdev->desc = regulator_desc; 3516 if (config->regmap) 3517 rdev->regmap = config->regmap; 3518 else if (dev_get_regmap(dev, NULL)) 3519 rdev->regmap = dev_get_regmap(dev, NULL); 3520 else if (dev->parent) 3521 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3522 INIT_LIST_HEAD(&rdev->consumer_list); 3523 INIT_LIST_HEAD(&rdev->list); 3524 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3525 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3526 3527 /* preform any regulator specific init */ 3528 if (init_data && init_data->regulator_init) { 3529 ret = init_data->regulator_init(rdev->reg_data); 3530 if (ret < 0) 3531 goto clean; 3532 } 3533 3534 /* register with sysfs */ 3535 rdev->dev.class = ®ulator_class; 3536 rdev->dev.of_node = config->of_node; 3537 rdev->dev.parent = dev; 3538 dev_set_name(&rdev->dev, "regulator.%d", 3539 atomic_inc_return(®ulator_no) - 1); 3540 ret = device_register(&rdev->dev); 3541 if (ret != 0) { 3542 put_device(&rdev->dev); 3543 goto clean; 3544 } 3545 3546 dev_set_drvdata(&rdev->dev, rdev); 3547 3548 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3549 ret = regulator_ena_gpio_request(rdev, config); 3550 if (ret != 0) { 3551 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3552 config->ena_gpio, ret); 3553 goto wash; 3554 } 3555 3556 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3557 rdev->ena_gpio_state = 1; 3558 3559 if (config->ena_gpio_invert) 3560 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3561 } 3562 3563 /* set regulator constraints */ 3564 if (init_data) 3565 constraints = &init_data->constraints; 3566 3567 ret = set_machine_constraints(rdev, constraints); 3568 if (ret < 0) 3569 goto scrub; 3570 3571 /* add attributes supported by this regulator */ 3572 ret = add_regulator_attributes(rdev); 3573 if (ret < 0) 3574 goto scrub; 3575 3576 if (init_data && init_data->supply_regulator) 3577 supply = init_data->supply_regulator; 3578 else if (regulator_desc->supply_name) 3579 supply = regulator_desc->supply_name; 3580 3581 if (supply) { 3582 struct regulator_dev *r; 3583 3584 r = regulator_dev_lookup(dev, supply, &ret); 3585 3586 if (!r) { 3587 dev_err(dev, "Failed to find supply %s\n", supply); 3588 ret = -EPROBE_DEFER; 3589 goto scrub; 3590 } 3591 3592 ret = set_supply(rdev, r); 3593 if (ret < 0) 3594 goto scrub; 3595 3596 /* Enable supply if rail is enabled */ 3597 if (_regulator_is_enabled(rdev)) { 3598 ret = regulator_enable(rdev->supply); 3599 if (ret < 0) 3600 goto scrub; 3601 } 3602 } 3603 3604 /* add consumers devices */ 3605 if (init_data) { 3606 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3607 ret = set_consumer_device_supply(rdev, 3608 init_data->consumer_supplies[i].dev_name, 3609 init_data->consumer_supplies[i].supply); 3610 if (ret < 0) { 3611 dev_err(dev, "Failed to set supply %s\n", 3612 init_data->consumer_supplies[i].supply); 3613 goto unset_supplies; 3614 } 3615 } 3616 } 3617 3618 list_add(&rdev->list, ®ulator_list); 3619 3620 rdev_init_debugfs(rdev); 3621out: 3622 mutex_unlock(®ulator_list_mutex); 3623 return rdev; 3624 3625unset_supplies: 3626 unset_regulator_supplies(rdev); 3627 3628scrub: 3629 if (rdev->supply) 3630 _regulator_put(rdev->supply); 3631 regulator_ena_gpio_free(rdev); 3632 kfree(rdev->constraints); 3633wash: 3634 device_unregister(&rdev->dev); 3635 /* device core frees rdev */ 3636 rdev = ERR_PTR(ret); 3637 goto out; 3638 3639clean: 3640 kfree(rdev); 3641 rdev = ERR_PTR(ret); 3642 goto out; 3643} 3644EXPORT_SYMBOL_GPL(regulator_register); 3645 3646/** 3647 * regulator_unregister - unregister regulator 3648 * @rdev: regulator to unregister 3649 * 3650 * Called by regulator drivers to unregister a regulator. 3651 */ 3652void regulator_unregister(struct regulator_dev *rdev) 3653{ 3654 if (rdev == NULL) 3655 return; 3656 3657 if (rdev->supply) 3658 regulator_put(rdev->supply); 3659 mutex_lock(®ulator_list_mutex); 3660 debugfs_remove_recursive(rdev->debugfs); 3661 flush_work(&rdev->disable_work.work); 3662 WARN_ON(rdev->open_count); 3663 unset_regulator_supplies(rdev); 3664 list_del(&rdev->list); 3665 kfree(rdev->constraints); 3666 regulator_ena_gpio_free(rdev); 3667 device_unregister(&rdev->dev); 3668 mutex_unlock(®ulator_list_mutex); 3669} 3670EXPORT_SYMBOL_GPL(regulator_unregister); 3671 3672/** 3673 * regulator_suspend_prepare - prepare regulators for system wide suspend 3674 * @state: system suspend state 3675 * 3676 * Configure each regulator with it's suspend operating parameters for state. 3677 * This will usually be called by machine suspend code prior to supending. 3678 */ 3679int regulator_suspend_prepare(suspend_state_t state) 3680{ 3681 struct regulator_dev *rdev; 3682 int ret = 0; 3683 3684 /* ON is handled by regulator active state */ 3685 if (state == PM_SUSPEND_ON) 3686 return -EINVAL; 3687 3688 mutex_lock(®ulator_list_mutex); 3689 list_for_each_entry(rdev, ®ulator_list, list) { 3690 3691 mutex_lock(&rdev->mutex); 3692 ret = suspend_prepare(rdev, state); 3693 mutex_unlock(&rdev->mutex); 3694 3695 if (ret < 0) { 3696 rdev_err(rdev, "failed to prepare\n"); 3697 goto out; 3698 } 3699 } 3700out: 3701 mutex_unlock(®ulator_list_mutex); 3702 return ret; 3703} 3704EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3705 3706/** 3707 * regulator_suspend_finish - resume regulators from system wide suspend 3708 * 3709 * Turn on regulators that might be turned off by regulator_suspend_prepare 3710 * and that should be turned on according to the regulators properties. 3711 */ 3712int regulator_suspend_finish(void) 3713{ 3714 struct regulator_dev *rdev; 3715 int ret = 0, error; 3716 3717 mutex_lock(®ulator_list_mutex); 3718 list_for_each_entry(rdev, ®ulator_list, list) { 3719 struct regulator_ops *ops = rdev->desc->ops; 3720 3721 mutex_lock(&rdev->mutex); 3722 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3723 ops->enable) { 3724 error = ops->enable(rdev); 3725 if (error) 3726 ret = error; 3727 } else { 3728 if (!has_full_constraints) 3729 goto unlock; 3730 if (!ops->disable) 3731 goto unlock; 3732 if (!_regulator_is_enabled(rdev)) 3733 goto unlock; 3734 3735 error = ops->disable(rdev); 3736 if (error) 3737 ret = error; 3738 } 3739unlock: 3740 mutex_unlock(&rdev->mutex); 3741 } 3742 mutex_unlock(®ulator_list_mutex); 3743 return ret; 3744} 3745EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3746 3747/** 3748 * regulator_has_full_constraints - the system has fully specified constraints 3749 * 3750 * Calling this function will cause the regulator API to disable all 3751 * regulators which have a zero use count and don't have an always_on 3752 * constraint in a late_initcall. 3753 * 3754 * The intention is that this will become the default behaviour in a 3755 * future kernel release so users are encouraged to use this facility 3756 * now. 3757 */ 3758void regulator_has_full_constraints(void) 3759{ 3760 has_full_constraints = 1; 3761} 3762EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3763 3764/** 3765 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3766 * 3767 * Calling this function will cause the regulator API to provide a 3768 * dummy regulator to consumers if no physical regulator is found, 3769 * allowing most consumers to proceed as though a regulator were 3770 * configured. This allows systems such as those with software 3771 * controllable regulators for the CPU core only to be brought up more 3772 * readily. 3773 */ 3774void regulator_use_dummy_regulator(void) 3775{ 3776 board_wants_dummy_regulator = true; 3777} 3778EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3779 3780/** 3781 * rdev_get_drvdata - get rdev regulator driver data 3782 * @rdev: regulator 3783 * 3784 * Get rdev regulator driver private data. This call can be used in the 3785 * regulator driver context. 3786 */ 3787void *rdev_get_drvdata(struct regulator_dev *rdev) 3788{ 3789 return rdev->reg_data; 3790} 3791EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3792 3793/** 3794 * regulator_get_drvdata - get regulator driver data 3795 * @regulator: regulator 3796 * 3797 * Get regulator driver private data. This call can be used in the consumer 3798 * driver context when non API regulator specific functions need to be called. 3799 */ 3800void *regulator_get_drvdata(struct regulator *regulator) 3801{ 3802 return regulator->rdev->reg_data; 3803} 3804EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3805 3806/** 3807 * regulator_set_drvdata - set regulator driver data 3808 * @regulator: regulator 3809 * @data: data 3810 */ 3811void regulator_set_drvdata(struct regulator *regulator, void *data) 3812{ 3813 regulator->rdev->reg_data = data; 3814} 3815EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3816 3817/** 3818 * regulator_get_id - get regulator ID 3819 * @rdev: regulator 3820 */ 3821int rdev_get_id(struct regulator_dev *rdev) 3822{ 3823 return rdev->desc->id; 3824} 3825EXPORT_SYMBOL_GPL(rdev_get_id); 3826 3827struct device *rdev_get_dev(struct regulator_dev *rdev) 3828{ 3829 return &rdev->dev; 3830} 3831EXPORT_SYMBOL_GPL(rdev_get_dev); 3832 3833void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3834{ 3835 return reg_init_data->driver_data; 3836} 3837EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3838 3839#ifdef CONFIG_DEBUG_FS 3840static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3841 size_t count, loff_t *ppos) 3842{ 3843 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3844 ssize_t len, ret = 0; 3845 struct regulator_map *map; 3846 3847 if (!buf) 3848 return -ENOMEM; 3849 3850 list_for_each_entry(map, ®ulator_map_list, list) { 3851 len = snprintf(buf + ret, PAGE_SIZE - ret, 3852 "%s -> %s.%s\n", 3853 rdev_get_name(map->regulator), map->dev_name, 3854 map->supply); 3855 if (len >= 0) 3856 ret += len; 3857 if (ret > PAGE_SIZE) { 3858 ret = PAGE_SIZE; 3859 break; 3860 } 3861 } 3862 3863 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3864 3865 kfree(buf); 3866 3867 return ret; 3868} 3869#endif 3870 3871static const struct file_operations supply_map_fops = { 3872#ifdef CONFIG_DEBUG_FS 3873 .read = supply_map_read_file, 3874 .llseek = default_llseek, 3875#endif 3876}; 3877 3878static int __init regulator_init(void) 3879{ 3880 int ret; 3881 3882 ret = class_register(®ulator_class); 3883 3884 debugfs_root = debugfs_create_dir("regulator", NULL); 3885 if (!debugfs_root) 3886 pr_warn("regulator: Failed to create debugfs directory\n"); 3887 3888 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3889 &supply_map_fops); 3890 3891 regulator_dummy_init(); 3892 3893 return ret; 3894} 3895 3896/* init early to allow our consumers to complete system booting */ 3897core_initcall(regulator_init); 3898 3899static int __init regulator_init_complete(void) 3900{ 3901 struct regulator_dev *rdev; 3902 struct regulator_ops *ops; 3903 struct regulation_constraints *c; 3904 int enabled, ret; 3905 3906 /* 3907 * Since DT doesn't provide an idiomatic mechanism for 3908 * enabling full constraints and since it's much more natural 3909 * with DT to provide them just assume that a DT enabled 3910 * system has full constraints. 3911 */ 3912 if (of_have_populated_dt()) 3913 has_full_constraints = true; 3914 3915 mutex_lock(®ulator_list_mutex); 3916 3917 /* If we have a full configuration then disable any regulators 3918 * which are not in use or always_on. This will become the 3919 * default behaviour in the future. 3920 */ 3921 list_for_each_entry(rdev, ®ulator_list, list) { 3922 ops = rdev->desc->ops; 3923 c = rdev->constraints; 3924 3925 if (!ops->disable || (c && c->always_on)) 3926 continue; 3927 3928 mutex_lock(&rdev->mutex); 3929 3930 if (rdev->use_count) 3931 goto unlock; 3932 3933 /* If we can't read the status assume it's on. */ 3934 if (ops->is_enabled) 3935 enabled = ops->is_enabled(rdev); 3936 else 3937 enabled = 1; 3938 3939 if (!enabled) 3940 goto unlock; 3941 3942 if (has_full_constraints) { 3943 /* We log since this may kill the system if it 3944 * goes wrong. */ 3945 rdev_info(rdev, "disabling\n"); 3946 ret = ops->disable(rdev); 3947 if (ret != 0) { 3948 rdev_err(rdev, "couldn't disable: %d\n", ret); 3949 } 3950 } else { 3951 /* The intention is that in future we will 3952 * assume that full constraints are provided 3953 * so warn even if we aren't going to do 3954 * anything here. 3955 */ 3956 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3957 } 3958 3959unlock: 3960 mutex_unlock(&rdev->mutex); 3961 } 3962 3963 mutex_unlock(®ulator_list_mutex); 3964 3965 return 0; 3966} 3967late_initcall(regulator_init_complete); 3968