core.c revision 587cea27e4feee7365b22935b3e19e1e8906e9cb
1/* 2 * core.c -- Voltage/Current Regulator framework. 3 * 4 * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5 * Copyright 2008 SlimLogic Ltd. 6 * 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/kernel.h> 17#include <linux/init.h> 18#include <linux/debugfs.h> 19#include <linux/device.h> 20#include <linux/slab.h> 21#include <linux/async.h> 22#include <linux/err.h> 23#include <linux/mutex.h> 24#include <linux/suspend.h> 25#include <linux/delay.h> 26#include <linux/gpio.h> 27#include <linux/of.h> 28#include <linux/regmap.h> 29#include <linux/regulator/of_regulator.h> 30#include <linux/regulator/consumer.h> 31#include <linux/regulator/driver.h> 32#include <linux/regulator/machine.h> 33#include <linux/module.h> 34 35#define CREATE_TRACE_POINTS 36#include <trace/events/regulator.h> 37 38#include "dummy.h" 39 40#define rdev_crit(rdev, fmt, ...) \ 41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 42#define rdev_err(rdev, fmt, ...) \ 43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 44#define rdev_warn(rdev, fmt, ...) \ 45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 46#define rdev_info(rdev, fmt, ...) \ 47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 48#define rdev_dbg(rdev, fmt, ...) \ 49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 50 51static DEFINE_MUTEX(regulator_list_mutex); 52static LIST_HEAD(regulator_list); 53static LIST_HEAD(regulator_map_list); 54static LIST_HEAD(regulator_ena_gpio_list); 55static bool has_full_constraints; 56static bool board_wants_dummy_regulator; 57 58static struct dentry *debugfs_root; 59 60/* 61 * struct regulator_map 62 * 63 * Used to provide symbolic supply names to devices. 64 */ 65struct regulator_map { 66 struct list_head list; 67 const char *dev_name; /* The dev_name() for the consumer */ 68 const char *supply; 69 struct regulator_dev *regulator; 70}; 71 72/* 73 * struct regulator_enable_gpio 74 * 75 * Management for shared enable GPIO pin 76 */ 77struct regulator_enable_gpio { 78 struct list_head list; 79 int gpio; 80 u32 enable_count; /* a number of enabled shared GPIO */ 81 u32 request_count; /* a number of requested shared GPIO */ 82 unsigned int ena_gpio_invert:1; 83}; 84 85/* 86 * struct regulator 87 * 88 * One for each consumer device. 89 */ 90struct regulator { 91 struct device *dev; 92 struct list_head list; 93 unsigned int always_on:1; 94 unsigned int bypass:1; 95 int uA_load; 96 int min_uV; 97 int max_uV; 98 char *supply_name; 99 struct device_attribute dev_attr; 100 struct regulator_dev *rdev; 101 struct dentry *debugfs; 102}; 103 104static int _regulator_is_enabled(struct regulator_dev *rdev); 105static int _regulator_disable(struct regulator_dev *rdev); 106static int _regulator_get_voltage(struct regulator_dev *rdev); 107static int _regulator_get_current_limit(struct regulator_dev *rdev); 108static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 109static void _notifier_call_chain(struct regulator_dev *rdev, 110 unsigned long event, void *data); 111static int _regulator_do_set_voltage(struct regulator_dev *rdev, 112 int min_uV, int max_uV); 113static struct regulator *create_regulator(struct regulator_dev *rdev, 114 struct device *dev, 115 const char *supply_name); 116 117static const char *rdev_get_name(struct regulator_dev *rdev) 118{ 119 if (rdev->constraints && rdev->constraints->name) 120 return rdev->constraints->name; 121 else if (rdev->desc->name) 122 return rdev->desc->name; 123 else 124 return ""; 125} 126 127/** 128 * of_get_regulator - get a regulator device node based on supply name 129 * @dev: Device pointer for the consumer (of regulator) device 130 * @supply: regulator supply name 131 * 132 * Extract the regulator device node corresponding to the supply name. 133 * returns the device node corresponding to the regulator if found, else 134 * returns NULL. 135 */ 136static struct device_node *of_get_regulator(struct device *dev, const char *supply) 137{ 138 struct device_node *regnode = NULL; 139 char prop_name[32]; /* 32 is max size of property name */ 140 141 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 142 143 snprintf(prop_name, 32, "%s-supply", supply); 144 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 145 146 if (!regnode) { 147 dev_dbg(dev, "Looking up %s property in node %s failed", 148 prop_name, dev->of_node->full_name); 149 return NULL; 150 } 151 return regnode; 152} 153 154static int _regulator_can_change_status(struct regulator_dev *rdev) 155{ 156 if (!rdev->constraints) 157 return 0; 158 159 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 160 return 1; 161 else 162 return 0; 163} 164 165/* Platform voltage constraint check */ 166static int regulator_check_voltage(struct regulator_dev *rdev, 167 int *min_uV, int *max_uV) 168{ 169 BUG_ON(*min_uV > *max_uV); 170 171 if (!rdev->constraints) { 172 rdev_err(rdev, "no constraints\n"); 173 return -ENODEV; 174 } 175 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 176 rdev_err(rdev, "operation not allowed\n"); 177 return -EPERM; 178 } 179 180 if (*max_uV > rdev->constraints->max_uV) 181 *max_uV = rdev->constraints->max_uV; 182 if (*min_uV < rdev->constraints->min_uV) 183 *min_uV = rdev->constraints->min_uV; 184 185 if (*min_uV > *max_uV) { 186 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 187 *min_uV, *max_uV); 188 return -EINVAL; 189 } 190 191 return 0; 192} 193 194/* Make sure we select a voltage that suits the needs of all 195 * regulator consumers 196 */ 197static int regulator_check_consumers(struct regulator_dev *rdev, 198 int *min_uV, int *max_uV) 199{ 200 struct regulator *regulator; 201 202 list_for_each_entry(regulator, &rdev->consumer_list, list) { 203 /* 204 * Assume consumers that didn't say anything are OK 205 * with anything in the constraint range. 206 */ 207 if (!regulator->min_uV && !regulator->max_uV) 208 continue; 209 210 if (*max_uV > regulator->max_uV) 211 *max_uV = regulator->max_uV; 212 if (*min_uV < regulator->min_uV) 213 *min_uV = regulator->min_uV; 214 } 215 216 if (*min_uV > *max_uV) { 217 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 218 *min_uV, *max_uV); 219 return -EINVAL; 220 } 221 222 return 0; 223} 224 225/* current constraint check */ 226static int regulator_check_current_limit(struct regulator_dev *rdev, 227 int *min_uA, int *max_uA) 228{ 229 BUG_ON(*min_uA > *max_uA); 230 231 if (!rdev->constraints) { 232 rdev_err(rdev, "no constraints\n"); 233 return -ENODEV; 234 } 235 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 236 rdev_err(rdev, "operation not allowed\n"); 237 return -EPERM; 238 } 239 240 if (*max_uA > rdev->constraints->max_uA) 241 *max_uA = rdev->constraints->max_uA; 242 if (*min_uA < rdev->constraints->min_uA) 243 *min_uA = rdev->constraints->min_uA; 244 245 if (*min_uA > *max_uA) { 246 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 247 *min_uA, *max_uA); 248 return -EINVAL; 249 } 250 251 return 0; 252} 253 254/* operating mode constraint check */ 255static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 256{ 257 switch (*mode) { 258 case REGULATOR_MODE_FAST: 259 case REGULATOR_MODE_NORMAL: 260 case REGULATOR_MODE_IDLE: 261 case REGULATOR_MODE_STANDBY: 262 break; 263 default: 264 rdev_err(rdev, "invalid mode %x specified\n", *mode); 265 return -EINVAL; 266 } 267 268 if (!rdev->constraints) { 269 rdev_err(rdev, "no constraints\n"); 270 return -ENODEV; 271 } 272 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 273 rdev_err(rdev, "operation not allowed\n"); 274 return -EPERM; 275 } 276 277 /* The modes are bitmasks, the most power hungry modes having 278 * the lowest values. If the requested mode isn't supported 279 * try higher modes. */ 280 while (*mode) { 281 if (rdev->constraints->valid_modes_mask & *mode) 282 return 0; 283 *mode /= 2; 284 } 285 286 return -EINVAL; 287} 288 289/* dynamic regulator mode switching constraint check */ 290static int regulator_check_drms(struct regulator_dev *rdev) 291{ 292 if (!rdev->constraints) { 293 rdev_err(rdev, "no constraints\n"); 294 return -ENODEV; 295 } 296 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 297 rdev_err(rdev, "operation not allowed\n"); 298 return -EPERM; 299 } 300 return 0; 301} 302 303static ssize_t regulator_uV_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 struct regulator_dev *rdev = dev_get_drvdata(dev); 307 ssize_t ret; 308 309 mutex_lock(&rdev->mutex); 310 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 311 mutex_unlock(&rdev->mutex); 312 313 return ret; 314} 315static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 316 317static ssize_t regulator_uA_show(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct regulator_dev *rdev = dev_get_drvdata(dev); 321 322 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 323} 324static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 325 326static ssize_t name_show(struct device *dev, struct device_attribute *attr, 327 char *buf) 328{ 329 struct regulator_dev *rdev = dev_get_drvdata(dev); 330 331 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 332} 333static DEVICE_ATTR_RO(name); 334 335static ssize_t regulator_print_opmode(char *buf, int mode) 336{ 337 switch (mode) { 338 case REGULATOR_MODE_FAST: 339 return sprintf(buf, "fast\n"); 340 case REGULATOR_MODE_NORMAL: 341 return sprintf(buf, "normal\n"); 342 case REGULATOR_MODE_IDLE: 343 return sprintf(buf, "idle\n"); 344 case REGULATOR_MODE_STANDBY: 345 return sprintf(buf, "standby\n"); 346 } 347 return sprintf(buf, "unknown\n"); 348} 349 350static ssize_t regulator_opmode_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352{ 353 struct regulator_dev *rdev = dev_get_drvdata(dev); 354 355 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 356} 357static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 358 359static ssize_t regulator_print_state(char *buf, int state) 360{ 361 if (state > 0) 362 return sprintf(buf, "enabled\n"); 363 else if (state == 0) 364 return sprintf(buf, "disabled\n"); 365 else 366 return sprintf(buf, "unknown\n"); 367} 368 369static ssize_t regulator_state_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371{ 372 struct regulator_dev *rdev = dev_get_drvdata(dev); 373 ssize_t ret; 374 375 mutex_lock(&rdev->mutex); 376 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 377 mutex_unlock(&rdev->mutex); 378 379 return ret; 380} 381static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 382 383static ssize_t regulator_status_show(struct device *dev, 384 struct device_attribute *attr, char *buf) 385{ 386 struct regulator_dev *rdev = dev_get_drvdata(dev); 387 int status; 388 char *label; 389 390 status = rdev->desc->ops->get_status(rdev); 391 if (status < 0) 392 return status; 393 394 switch (status) { 395 case REGULATOR_STATUS_OFF: 396 label = "off"; 397 break; 398 case REGULATOR_STATUS_ON: 399 label = "on"; 400 break; 401 case REGULATOR_STATUS_ERROR: 402 label = "error"; 403 break; 404 case REGULATOR_STATUS_FAST: 405 label = "fast"; 406 break; 407 case REGULATOR_STATUS_NORMAL: 408 label = "normal"; 409 break; 410 case REGULATOR_STATUS_IDLE: 411 label = "idle"; 412 break; 413 case REGULATOR_STATUS_STANDBY: 414 label = "standby"; 415 break; 416 case REGULATOR_STATUS_BYPASS: 417 label = "bypass"; 418 break; 419 case REGULATOR_STATUS_UNDEFINED: 420 label = "undefined"; 421 break; 422 default: 423 return -ERANGE; 424 } 425 426 return sprintf(buf, "%s\n", label); 427} 428static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 429 430static ssize_t regulator_min_uA_show(struct device *dev, 431 struct device_attribute *attr, char *buf) 432{ 433 struct regulator_dev *rdev = dev_get_drvdata(dev); 434 435 if (!rdev->constraints) 436 return sprintf(buf, "constraint not defined\n"); 437 438 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 439} 440static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 441 442static ssize_t regulator_max_uA_show(struct device *dev, 443 struct device_attribute *attr, char *buf) 444{ 445 struct regulator_dev *rdev = dev_get_drvdata(dev); 446 447 if (!rdev->constraints) 448 return sprintf(buf, "constraint not defined\n"); 449 450 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 451} 452static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 453 454static ssize_t regulator_min_uV_show(struct device *dev, 455 struct device_attribute *attr, char *buf) 456{ 457 struct regulator_dev *rdev = dev_get_drvdata(dev); 458 459 if (!rdev->constraints) 460 return sprintf(buf, "constraint not defined\n"); 461 462 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 463} 464static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 465 466static ssize_t regulator_max_uV_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468{ 469 struct regulator_dev *rdev = dev_get_drvdata(dev); 470 471 if (!rdev->constraints) 472 return sprintf(buf, "constraint not defined\n"); 473 474 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 475} 476static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 477 478static ssize_t regulator_total_uA_show(struct device *dev, 479 struct device_attribute *attr, char *buf) 480{ 481 struct regulator_dev *rdev = dev_get_drvdata(dev); 482 struct regulator *regulator; 483 int uA = 0; 484 485 mutex_lock(&rdev->mutex); 486 list_for_each_entry(regulator, &rdev->consumer_list, list) 487 uA += regulator->uA_load; 488 mutex_unlock(&rdev->mutex); 489 return sprintf(buf, "%d\n", uA); 490} 491static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 492 493static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 494 char *buf) 495{ 496 struct regulator_dev *rdev = dev_get_drvdata(dev); 497 return sprintf(buf, "%d\n", rdev->use_count); 498} 499static DEVICE_ATTR_RO(num_users); 500 501static ssize_t type_show(struct device *dev, struct device_attribute *attr, 502 char *buf) 503{ 504 struct regulator_dev *rdev = dev_get_drvdata(dev); 505 506 switch (rdev->desc->type) { 507 case REGULATOR_VOLTAGE: 508 return sprintf(buf, "voltage\n"); 509 case REGULATOR_CURRENT: 510 return sprintf(buf, "current\n"); 511 } 512 return sprintf(buf, "unknown\n"); 513} 514static DEVICE_ATTR_RO(type); 515 516static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 517 struct device_attribute *attr, char *buf) 518{ 519 struct regulator_dev *rdev = dev_get_drvdata(dev); 520 521 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 522} 523static DEVICE_ATTR(suspend_mem_microvolts, 0444, 524 regulator_suspend_mem_uV_show, NULL); 525 526static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 527 struct device_attribute *attr, char *buf) 528{ 529 struct regulator_dev *rdev = dev_get_drvdata(dev); 530 531 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 532} 533static DEVICE_ATTR(suspend_disk_microvolts, 0444, 534 regulator_suspend_disk_uV_show, NULL); 535 536static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 struct regulator_dev *rdev = dev_get_drvdata(dev); 540 541 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 542} 543static DEVICE_ATTR(suspend_standby_microvolts, 0444, 544 regulator_suspend_standby_uV_show, NULL); 545 546static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 547 struct device_attribute *attr, char *buf) 548{ 549 struct regulator_dev *rdev = dev_get_drvdata(dev); 550 551 return regulator_print_opmode(buf, 552 rdev->constraints->state_mem.mode); 553} 554static DEVICE_ATTR(suspend_mem_mode, 0444, 555 regulator_suspend_mem_mode_show, NULL); 556 557static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 558 struct device_attribute *attr, char *buf) 559{ 560 struct regulator_dev *rdev = dev_get_drvdata(dev); 561 562 return regulator_print_opmode(buf, 563 rdev->constraints->state_disk.mode); 564} 565static DEVICE_ATTR(suspend_disk_mode, 0444, 566 regulator_suspend_disk_mode_show, NULL); 567 568static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 569 struct device_attribute *attr, char *buf) 570{ 571 struct regulator_dev *rdev = dev_get_drvdata(dev); 572 573 return regulator_print_opmode(buf, 574 rdev->constraints->state_standby.mode); 575} 576static DEVICE_ATTR(suspend_standby_mode, 0444, 577 regulator_suspend_standby_mode_show, NULL); 578 579static ssize_t regulator_suspend_mem_state_show(struct device *dev, 580 struct device_attribute *attr, char *buf) 581{ 582 struct regulator_dev *rdev = dev_get_drvdata(dev); 583 584 return regulator_print_state(buf, 585 rdev->constraints->state_mem.enabled); 586} 587static DEVICE_ATTR(suspend_mem_state, 0444, 588 regulator_suspend_mem_state_show, NULL); 589 590static ssize_t regulator_suspend_disk_state_show(struct device *dev, 591 struct device_attribute *attr, char *buf) 592{ 593 struct regulator_dev *rdev = dev_get_drvdata(dev); 594 595 return regulator_print_state(buf, 596 rdev->constraints->state_disk.enabled); 597} 598static DEVICE_ATTR(suspend_disk_state, 0444, 599 regulator_suspend_disk_state_show, NULL); 600 601static ssize_t regulator_suspend_standby_state_show(struct device *dev, 602 struct device_attribute *attr, char *buf) 603{ 604 struct regulator_dev *rdev = dev_get_drvdata(dev); 605 606 return regulator_print_state(buf, 607 rdev->constraints->state_standby.enabled); 608} 609static DEVICE_ATTR(suspend_standby_state, 0444, 610 regulator_suspend_standby_state_show, NULL); 611 612static ssize_t regulator_bypass_show(struct device *dev, 613 struct device_attribute *attr, char *buf) 614{ 615 struct regulator_dev *rdev = dev_get_drvdata(dev); 616 const char *report; 617 bool bypass; 618 int ret; 619 620 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 621 622 if (ret != 0) 623 report = "unknown"; 624 else if (bypass) 625 report = "enabled"; 626 else 627 report = "disabled"; 628 629 return sprintf(buf, "%s\n", report); 630} 631static DEVICE_ATTR(bypass, 0444, 632 regulator_bypass_show, NULL); 633 634/* 635 * These are the only attributes are present for all regulators. 636 * Other attributes are a function of regulator functionality. 637 */ 638static struct attribute *regulator_dev_attrs[] = { 639 &dev_attr_name.attr, 640 &dev_attr_num_users.attr, 641 &dev_attr_type.attr, 642 NULL, 643}; 644ATTRIBUTE_GROUPS(regulator_dev); 645 646static void regulator_dev_release(struct device *dev) 647{ 648 struct regulator_dev *rdev = dev_get_drvdata(dev); 649 kfree(rdev); 650} 651 652static struct class regulator_class = { 653 .name = "regulator", 654 .dev_release = regulator_dev_release, 655 .dev_groups = regulator_dev_groups, 656}; 657 658/* Calculate the new optimum regulator operating mode based on the new total 659 * consumer load. All locks held by caller */ 660static void drms_uA_update(struct regulator_dev *rdev) 661{ 662 struct regulator *sibling; 663 int current_uA = 0, output_uV, input_uV, err; 664 unsigned int mode; 665 666 err = regulator_check_drms(rdev); 667 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 668 (!rdev->desc->ops->get_voltage && 669 !rdev->desc->ops->get_voltage_sel) || 670 !rdev->desc->ops->set_mode) 671 return; 672 673 /* get output voltage */ 674 output_uV = _regulator_get_voltage(rdev); 675 if (output_uV <= 0) 676 return; 677 678 /* get input voltage */ 679 input_uV = 0; 680 if (rdev->supply) 681 input_uV = regulator_get_voltage(rdev->supply); 682 if (input_uV <= 0) 683 input_uV = rdev->constraints->input_uV; 684 if (input_uV <= 0) 685 return; 686 687 /* calc total requested load */ 688 list_for_each_entry(sibling, &rdev->consumer_list, list) 689 current_uA += sibling->uA_load; 690 691 /* now get the optimum mode for our new total regulator load */ 692 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 693 output_uV, current_uA); 694 695 /* check the new mode is allowed */ 696 err = regulator_mode_constrain(rdev, &mode); 697 if (err == 0) 698 rdev->desc->ops->set_mode(rdev, mode); 699} 700 701static int suspend_set_state(struct regulator_dev *rdev, 702 struct regulator_state *rstate) 703{ 704 int ret = 0; 705 706 /* If we have no suspend mode configration don't set anything; 707 * only warn if the driver implements set_suspend_voltage or 708 * set_suspend_mode callback. 709 */ 710 if (!rstate->enabled && !rstate->disabled) { 711 if (rdev->desc->ops->set_suspend_voltage || 712 rdev->desc->ops->set_suspend_mode) 713 rdev_warn(rdev, "No configuration\n"); 714 return 0; 715 } 716 717 if (rstate->enabled && rstate->disabled) { 718 rdev_err(rdev, "invalid configuration\n"); 719 return -EINVAL; 720 } 721 722 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 723 ret = rdev->desc->ops->set_suspend_enable(rdev); 724 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 725 ret = rdev->desc->ops->set_suspend_disable(rdev); 726 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 727 ret = 0; 728 729 if (ret < 0) { 730 rdev_err(rdev, "failed to enabled/disable\n"); 731 return ret; 732 } 733 734 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 735 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 736 if (ret < 0) { 737 rdev_err(rdev, "failed to set voltage\n"); 738 return ret; 739 } 740 } 741 742 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 743 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 744 if (ret < 0) { 745 rdev_err(rdev, "failed to set mode\n"); 746 return ret; 747 } 748 } 749 return ret; 750} 751 752/* locks held by caller */ 753static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 754{ 755 if (!rdev->constraints) 756 return -EINVAL; 757 758 switch (state) { 759 case PM_SUSPEND_STANDBY: 760 return suspend_set_state(rdev, 761 &rdev->constraints->state_standby); 762 case PM_SUSPEND_MEM: 763 return suspend_set_state(rdev, 764 &rdev->constraints->state_mem); 765 case PM_SUSPEND_MAX: 766 return suspend_set_state(rdev, 767 &rdev->constraints->state_disk); 768 default: 769 return -EINVAL; 770 } 771} 772 773static void print_constraints(struct regulator_dev *rdev) 774{ 775 struct regulation_constraints *constraints = rdev->constraints; 776 char buf[80] = ""; 777 int count = 0; 778 int ret; 779 780 if (constraints->min_uV && constraints->max_uV) { 781 if (constraints->min_uV == constraints->max_uV) 782 count += sprintf(buf + count, "%d mV ", 783 constraints->min_uV / 1000); 784 else 785 count += sprintf(buf + count, "%d <--> %d mV ", 786 constraints->min_uV / 1000, 787 constraints->max_uV / 1000); 788 } 789 790 if (!constraints->min_uV || 791 constraints->min_uV != constraints->max_uV) { 792 ret = _regulator_get_voltage(rdev); 793 if (ret > 0) 794 count += sprintf(buf + count, "at %d mV ", ret / 1000); 795 } 796 797 if (constraints->uV_offset) 798 count += sprintf(buf, "%dmV offset ", 799 constraints->uV_offset / 1000); 800 801 if (constraints->min_uA && constraints->max_uA) { 802 if (constraints->min_uA == constraints->max_uA) 803 count += sprintf(buf + count, "%d mA ", 804 constraints->min_uA / 1000); 805 else 806 count += sprintf(buf + count, "%d <--> %d mA ", 807 constraints->min_uA / 1000, 808 constraints->max_uA / 1000); 809 } 810 811 if (!constraints->min_uA || 812 constraints->min_uA != constraints->max_uA) { 813 ret = _regulator_get_current_limit(rdev); 814 if (ret > 0) 815 count += sprintf(buf + count, "at %d mA ", ret / 1000); 816 } 817 818 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 819 count += sprintf(buf + count, "fast "); 820 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 821 count += sprintf(buf + count, "normal "); 822 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 823 count += sprintf(buf + count, "idle "); 824 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 825 count += sprintf(buf + count, "standby"); 826 827 if (!count) 828 sprintf(buf, "no parameters"); 829 830 rdev_info(rdev, "%s\n", buf); 831 832 if ((constraints->min_uV != constraints->max_uV) && 833 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 834 rdev_warn(rdev, 835 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 836} 837 838static int machine_constraints_voltage(struct regulator_dev *rdev, 839 struct regulation_constraints *constraints) 840{ 841 struct regulator_ops *ops = rdev->desc->ops; 842 int ret; 843 844 /* do we need to apply the constraint voltage */ 845 if (rdev->constraints->apply_uV && 846 rdev->constraints->min_uV == rdev->constraints->max_uV) { 847 ret = _regulator_do_set_voltage(rdev, 848 rdev->constraints->min_uV, 849 rdev->constraints->max_uV); 850 if (ret < 0) { 851 rdev_err(rdev, "failed to apply %duV constraint\n", 852 rdev->constraints->min_uV); 853 return ret; 854 } 855 } 856 857 /* constrain machine-level voltage specs to fit 858 * the actual range supported by this regulator. 859 */ 860 if (ops->list_voltage && rdev->desc->n_voltages) { 861 int count = rdev->desc->n_voltages; 862 int i; 863 int min_uV = INT_MAX; 864 int max_uV = INT_MIN; 865 int cmin = constraints->min_uV; 866 int cmax = constraints->max_uV; 867 868 /* it's safe to autoconfigure fixed-voltage supplies 869 and the constraints are used by list_voltage. */ 870 if (count == 1 && !cmin) { 871 cmin = 1; 872 cmax = INT_MAX; 873 constraints->min_uV = cmin; 874 constraints->max_uV = cmax; 875 } 876 877 /* voltage constraints are optional */ 878 if ((cmin == 0) && (cmax == 0)) 879 return 0; 880 881 /* else require explicit machine-level constraints */ 882 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 883 rdev_err(rdev, "invalid voltage constraints\n"); 884 return -EINVAL; 885 } 886 887 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 888 for (i = 0; i < count; i++) { 889 int value; 890 891 value = ops->list_voltage(rdev, i); 892 if (value <= 0) 893 continue; 894 895 /* maybe adjust [min_uV..max_uV] */ 896 if (value >= cmin && value < min_uV) 897 min_uV = value; 898 if (value <= cmax && value > max_uV) 899 max_uV = value; 900 } 901 902 /* final: [min_uV..max_uV] valid iff constraints valid */ 903 if (max_uV < min_uV) { 904 rdev_err(rdev, 905 "unsupportable voltage constraints %u-%uuV\n", 906 min_uV, max_uV); 907 return -EINVAL; 908 } 909 910 /* use regulator's subset of machine constraints */ 911 if (constraints->min_uV < min_uV) { 912 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 913 constraints->min_uV, min_uV); 914 constraints->min_uV = min_uV; 915 } 916 if (constraints->max_uV > max_uV) { 917 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 918 constraints->max_uV, max_uV); 919 constraints->max_uV = max_uV; 920 } 921 } 922 923 return 0; 924} 925 926/** 927 * set_machine_constraints - sets regulator constraints 928 * @rdev: regulator source 929 * @constraints: constraints to apply 930 * 931 * Allows platform initialisation code to define and constrain 932 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 933 * Constraints *must* be set by platform code in order for some 934 * regulator operations to proceed i.e. set_voltage, set_current_limit, 935 * set_mode. 936 */ 937static int set_machine_constraints(struct regulator_dev *rdev, 938 const struct regulation_constraints *constraints) 939{ 940 int ret = 0; 941 struct regulator_ops *ops = rdev->desc->ops; 942 943 if (constraints) 944 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 945 GFP_KERNEL); 946 else 947 rdev->constraints = kzalloc(sizeof(*constraints), 948 GFP_KERNEL); 949 if (!rdev->constraints) 950 return -ENOMEM; 951 952 ret = machine_constraints_voltage(rdev, rdev->constraints); 953 if (ret != 0) 954 goto out; 955 956 /* do we need to setup our suspend state */ 957 if (rdev->constraints->initial_state) { 958 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 959 if (ret < 0) { 960 rdev_err(rdev, "failed to set suspend state\n"); 961 goto out; 962 } 963 } 964 965 if (rdev->constraints->initial_mode) { 966 if (!ops->set_mode) { 967 rdev_err(rdev, "no set_mode operation\n"); 968 ret = -EINVAL; 969 goto out; 970 } 971 972 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 973 if (ret < 0) { 974 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 975 goto out; 976 } 977 } 978 979 /* If the constraints say the regulator should be on at this point 980 * and we have control then make sure it is enabled. 981 */ 982 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 983 ops->enable) { 984 ret = ops->enable(rdev); 985 if (ret < 0) { 986 rdev_err(rdev, "failed to enable\n"); 987 goto out; 988 } 989 } 990 991 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) { 992 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); 993 if (ret < 0) { 994 rdev_err(rdev, "failed to set ramp_delay\n"); 995 goto out; 996 } 997 } 998 999 print_constraints(rdev); 1000 return 0; 1001out: 1002 kfree(rdev->constraints); 1003 rdev->constraints = NULL; 1004 return ret; 1005} 1006 1007/** 1008 * set_supply - set regulator supply regulator 1009 * @rdev: regulator name 1010 * @supply_rdev: supply regulator name 1011 * 1012 * Called by platform initialisation code to set the supply regulator for this 1013 * regulator. This ensures that a regulators supply will also be enabled by the 1014 * core if it's child is enabled. 1015 */ 1016static int set_supply(struct regulator_dev *rdev, 1017 struct regulator_dev *supply_rdev) 1018{ 1019 int err; 1020 1021 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 1022 1023 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 1024 if (rdev->supply == NULL) { 1025 err = -ENOMEM; 1026 return err; 1027 } 1028 supply_rdev->open_count++; 1029 1030 return 0; 1031} 1032 1033/** 1034 * set_consumer_device_supply - Bind a regulator to a symbolic supply 1035 * @rdev: regulator source 1036 * @consumer_dev_name: dev_name() string for device supply applies to 1037 * @supply: symbolic name for supply 1038 * 1039 * Allows platform initialisation code to map physical regulator 1040 * sources to symbolic names for supplies for use by devices. Devices 1041 * should use these symbolic names to request regulators, avoiding the 1042 * need to provide board-specific regulator names as platform data. 1043 */ 1044static int set_consumer_device_supply(struct regulator_dev *rdev, 1045 const char *consumer_dev_name, 1046 const char *supply) 1047{ 1048 struct regulator_map *node; 1049 int has_dev; 1050 1051 if (supply == NULL) 1052 return -EINVAL; 1053 1054 if (consumer_dev_name != NULL) 1055 has_dev = 1; 1056 else 1057 has_dev = 0; 1058 1059 list_for_each_entry(node, ®ulator_map_list, list) { 1060 if (node->dev_name && consumer_dev_name) { 1061 if (strcmp(node->dev_name, consumer_dev_name) != 0) 1062 continue; 1063 } else if (node->dev_name || consumer_dev_name) { 1064 continue; 1065 } 1066 1067 if (strcmp(node->supply, supply) != 0) 1068 continue; 1069 1070 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1071 consumer_dev_name, 1072 dev_name(&node->regulator->dev), 1073 node->regulator->desc->name, 1074 supply, 1075 dev_name(&rdev->dev), rdev_get_name(rdev)); 1076 return -EBUSY; 1077 } 1078 1079 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1080 if (node == NULL) 1081 return -ENOMEM; 1082 1083 node->regulator = rdev; 1084 node->supply = supply; 1085 1086 if (has_dev) { 1087 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1088 if (node->dev_name == NULL) { 1089 kfree(node); 1090 return -ENOMEM; 1091 } 1092 } 1093 1094 list_add(&node->list, ®ulator_map_list); 1095 return 0; 1096} 1097 1098static void unset_regulator_supplies(struct regulator_dev *rdev) 1099{ 1100 struct regulator_map *node, *n; 1101 1102 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1103 if (rdev == node->regulator) { 1104 list_del(&node->list); 1105 kfree(node->dev_name); 1106 kfree(node); 1107 } 1108 } 1109} 1110 1111#define REG_STR_SIZE 64 1112 1113static struct regulator *create_regulator(struct regulator_dev *rdev, 1114 struct device *dev, 1115 const char *supply_name) 1116{ 1117 struct regulator *regulator; 1118 char buf[REG_STR_SIZE]; 1119 int err, size; 1120 1121 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1122 if (regulator == NULL) 1123 return NULL; 1124 1125 mutex_lock(&rdev->mutex); 1126 regulator->rdev = rdev; 1127 list_add(®ulator->list, &rdev->consumer_list); 1128 1129 if (dev) { 1130 regulator->dev = dev; 1131 1132 /* Add a link to the device sysfs entry */ 1133 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1134 dev->kobj.name, supply_name); 1135 if (size >= REG_STR_SIZE) 1136 goto overflow_err; 1137 1138 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1139 if (regulator->supply_name == NULL) 1140 goto overflow_err; 1141 1142 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1143 buf); 1144 if (err) { 1145 rdev_warn(rdev, "could not add device link %s err %d\n", 1146 dev->kobj.name, err); 1147 /* non-fatal */ 1148 } 1149 } else { 1150 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1151 if (regulator->supply_name == NULL) 1152 goto overflow_err; 1153 } 1154 1155 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1156 rdev->debugfs); 1157 if (!regulator->debugfs) { 1158 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1159 } else { 1160 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1161 ®ulator->uA_load); 1162 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1163 ®ulator->min_uV); 1164 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1165 ®ulator->max_uV); 1166 } 1167 1168 /* 1169 * Check now if the regulator is an always on regulator - if 1170 * it is then we don't need to do nearly so much work for 1171 * enable/disable calls. 1172 */ 1173 if (!_regulator_can_change_status(rdev) && 1174 _regulator_is_enabled(rdev)) 1175 regulator->always_on = true; 1176 1177 mutex_unlock(&rdev->mutex); 1178 return regulator; 1179overflow_err: 1180 list_del(®ulator->list); 1181 kfree(regulator); 1182 mutex_unlock(&rdev->mutex); 1183 return NULL; 1184} 1185 1186static int _regulator_get_enable_time(struct regulator_dev *rdev) 1187{ 1188 if (!rdev->desc->ops->enable_time) 1189 return rdev->desc->enable_time; 1190 return rdev->desc->ops->enable_time(rdev); 1191} 1192 1193static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1194 const char *supply, 1195 int *ret) 1196{ 1197 struct regulator_dev *r; 1198 struct device_node *node; 1199 struct regulator_map *map; 1200 const char *devname = NULL; 1201 1202 /* first do a dt based lookup */ 1203 if (dev && dev->of_node) { 1204 node = of_get_regulator(dev, supply); 1205 if (node) { 1206 list_for_each_entry(r, ®ulator_list, list) 1207 if (r->dev.parent && 1208 node == r->dev.of_node) 1209 return r; 1210 } else { 1211 /* 1212 * If we couldn't even get the node then it's 1213 * not just that the device didn't register 1214 * yet, there's no node and we'll never 1215 * succeed. 1216 */ 1217 *ret = -ENODEV; 1218 } 1219 } 1220 1221 /* if not found, try doing it non-dt way */ 1222 if (dev) 1223 devname = dev_name(dev); 1224 1225 list_for_each_entry(r, ®ulator_list, list) 1226 if (strcmp(rdev_get_name(r), supply) == 0) 1227 return r; 1228 1229 list_for_each_entry(map, ®ulator_map_list, list) { 1230 /* If the mapping has a device set up it must match */ 1231 if (map->dev_name && 1232 (!devname || strcmp(map->dev_name, devname))) 1233 continue; 1234 1235 if (strcmp(map->supply, supply) == 0) 1236 return map->regulator; 1237 } 1238 1239 1240 return NULL; 1241} 1242 1243/* Internal regulator request function */ 1244static struct regulator *_regulator_get(struct device *dev, const char *id, 1245 int exclusive) 1246{ 1247 struct regulator_dev *rdev; 1248 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1249 const char *devname = NULL; 1250 int ret = 0; 1251 1252 if (id == NULL) { 1253 pr_err("get() with no identifier\n"); 1254 return regulator; 1255 } 1256 1257 if (dev) 1258 devname = dev_name(dev); 1259 1260 mutex_lock(®ulator_list_mutex); 1261 1262 rdev = regulator_dev_lookup(dev, id, &ret); 1263 if (rdev) 1264 goto found; 1265 1266 /* 1267 * If we have return value from dev_lookup fail, we do not expect to 1268 * succeed, so, quit with appropriate error value 1269 */ 1270 if (ret) { 1271 regulator = ERR_PTR(ret); 1272 goto out; 1273 } 1274 1275 if (board_wants_dummy_regulator) { 1276 rdev = dummy_regulator_rdev; 1277 goto found; 1278 } 1279 1280#ifdef CONFIG_REGULATOR_DUMMY 1281 if (!devname) 1282 devname = "deviceless"; 1283 1284 /* If the board didn't flag that it was fully constrained then 1285 * substitute in a dummy regulator so consumers can continue. 1286 */ 1287 if (!has_full_constraints) { 1288 pr_warn("%s supply %s not found, using dummy regulator\n", 1289 devname, id); 1290 rdev = dummy_regulator_rdev; 1291 goto found; 1292 } 1293#endif 1294 1295 mutex_unlock(®ulator_list_mutex); 1296 return regulator; 1297 1298found: 1299 if (rdev->exclusive) { 1300 regulator = ERR_PTR(-EPERM); 1301 goto out; 1302 } 1303 1304 if (exclusive && rdev->open_count) { 1305 regulator = ERR_PTR(-EBUSY); 1306 goto out; 1307 } 1308 1309 if (!try_module_get(rdev->owner)) 1310 goto out; 1311 1312 regulator = create_regulator(rdev, dev, id); 1313 if (regulator == NULL) { 1314 regulator = ERR_PTR(-ENOMEM); 1315 module_put(rdev->owner); 1316 goto out; 1317 } 1318 1319 rdev->open_count++; 1320 if (exclusive) { 1321 rdev->exclusive = 1; 1322 1323 ret = _regulator_is_enabled(rdev); 1324 if (ret > 0) 1325 rdev->use_count = 1; 1326 else 1327 rdev->use_count = 0; 1328 } 1329 1330out: 1331 mutex_unlock(®ulator_list_mutex); 1332 1333 return regulator; 1334} 1335 1336/** 1337 * regulator_get - lookup and obtain a reference to a regulator. 1338 * @dev: device for regulator "consumer" 1339 * @id: Supply name or regulator ID. 1340 * 1341 * Returns a struct regulator corresponding to the regulator producer, 1342 * or IS_ERR() condition containing errno. 1343 * 1344 * Use of supply names configured via regulator_set_device_supply() is 1345 * strongly encouraged. It is recommended that the supply name used 1346 * should match the name used for the supply and/or the relevant 1347 * device pins in the datasheet. 1348 */ 1349struct regulator *regulator_get(struct device *dev, const char *id) 1350{ 1351 return _regulator_get(dev, id, 0); 1352} 1353EXPORT_SYMBOL_GPL(regulator_get); 1354 1355static void devm_regulator_release(struct device *dev, void *res) 1356{ 1357 regulator_put(*(struct regulator **)res); 1358} 1359 1360/** 1361 * devm_regulator_get - Resource managed regulator_get() 1362 * @dev: device for regulator "consumer" 1363 * @id: Supply name or regulator ID. 1364 * 1365 * Managed regulator_get(). Regulators returned from this function are 1366 * automatically regulator_put() on driver detach. See regulator_get() for more 1367 * information. 1368 */ 1369struct regulator *devm_regulator_get(struct device *dev, const char *id) 1370{ 1371 struct regulator **ptr, *regulator; 1372 1373 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1374 if (!ptr) 1375 return ERR_PTR(-ENOMEM); 1376 1377 regulator = regulator_get(dev, id); 1378 if (!IS_ERR(regulator)) { 1379 *ptr = regulator; 1380 devres_add(dev, ptr); 1381 } else { 1382 devres_free(ptr); 1383 } 1384 1385 return regulator; 1386} 1387EXPORT_SYMBOL_GPL(devm_regulator_get); 1388 1389/** 1390 * regulator_get_exclusive - obtain exclusive access to a regulator. 1391 * @dev: device for regulator "consumer" 1392 * @id: Supply name or regulator ID. 1393 * 1394 * Returns a struct regulator corresponding to the regulator producer, 1395 * or IS_ERR() condition containing errno. Other consumers will be 1396 * unable to obtain this reference is held and the use count for the 1397 * regulator will be initialised to reflect the current state of the 1398 * regulator. 1399 * 1400 * This is intended for use by consumers which cannot tolerate shared 1401 * use of the regulator such as those which need to force the 1402 * regulator off for correct operation of the hardware they are 1403 * controlling. 1404 * 1405 * Use of supply names configured via regulator_set_device_supply() is 1406 * strongly encouraged. It is recommended that the supply name used 1407 * should match the name used for the supply and/or the relevant 1408 * device pins in the datasheet. 1409 */ 1410struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1411{ 1412 return _regulator_get(dev, id, 1); 1413} 1414EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1415 1416/* Locks held by regulator_put() */ 1417static void _regulator_put(struct regulator *regulator) 1418{ 1419 struct regulator_dev *rdev; 1420 1421 if (regulator == NULL || IS_ERR(regulator)) 1422 return; 1423 1424 rdev = regulator->rdev; 1425 1426 debugfs_remove_recursive(regulator->debugfs); 1427 1428 /* remove any sysfs entries */ 1429 if (regulator->dev) 1430 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1431 kfree(regulator->supply_name); 1432 list_del(®ulator->list); 1433 kfree(regulator); 1434 1435 rdev->open_count--; 1436 rdev->exclusive = 0; 1437 1438 module_put(rdev->owner); 1439} 1440 1441/** 1442 * regulator_put - "free" the regulator source 1443 * @regulator: regulator source 1444 * 1445 * Note: drivers must ensure that all regulator_enable calls made on this 1446 * regulator source are balanced by regulator_disable calls prior to calling 1447 * this function. 1448 */ 1449void regulator_put(struct regulator *regulator) 1450{ 1451 mutex_lock(®ulator_list_mutex); 1452 _regulator_put(regulator); 1453 mutex_unlock(®ulator_list_mutex); 1454} 1455EXPORT_SYMBOL_GPL(regulator_put); 1456 1457static int devm_regulator_match(struct device *dev, void *res, void *data) 1458{ 1459 struct regulator **r = res; 1460 if (!r || !*r) { 1461 WARN_ON(!r || !*r); 1462 return 0; 1463 } 1464 return *r == data; 1465} 1466 1467/** 1468 * devm_regulator_put - Resource managed regulator_put() 1469 * @regulator: regulator to free 1470 * 1471 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1472 * this function will not need to be called and the resource management 1473 * code will ensure that the resource is freed. 1474 */ 1475void devm_regulator_put(struct regulator *regulator) 1476{ 1477 int rc; 1478 1479 rc = devres_release(regulator->dev, devm_regulator_release, 1480 devm_regulator_match, regulator); 1481 if (rc != 0) 1482 WARN_ON(rc); 1483} 1484EXPORT_SYMBOL_GPL(devm_regulator_put); 1485 1486/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1487static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1488 const struct regulator_config *config) 1489{ 1490 struct regulator_enable_gpio *pin; 1491 int ret; 1492 1493 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1494 if (pin->gpio == config->ena_gpio) { 1495 rdev_dbg(rdev, "GPIO %d is already used\n", 1496 config->ena_gpio); 1497 goto update_ena_gpio_to_rdev; 1498 } 1499 } 1500 1501 ret = gpio_request_one(config->ena_gpio, 1502 GPIOF_DIR_OUT | config->ena_gpio_flags, 1503 rdev_get_name(rdev)); 1504 if (ret) 1505 return ret; 1506 1507 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1508 if (pin == NULL) { 1509 gpio_free(config->ena_gpio); 1510 return -ENOMEM; 1511 } 1512 1513 pin->gpio = config->ena_gpio; 1514 pin->ena_gpio_invert = config->ena_gpio_invert; 1515 list_add(&pin->list, ®ulator_ena_gpio_list); 1516 1517update_ena_gpio_to_rdev: 1518 pin->request_count++; 1519 rdev->ena_pin = pin; 1520 return 0; 1521} 1522 1523static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1524{ 1525 struct regulator_enable_gpio *pin, *n; 1526 1527 if (!rdev->ena_pin) 1528 return; 1529 1530 /* Free the GPIO only in case of no use */ 1531 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1532 if (pin->gpio == rdev->ena_pin->gpio) { 1533 if (pin->request_count <= 1) { 1534 pin->request_count = 0; 1535 gpio_free(pin->gpio); 1536 list_del(&pin->list); 1537 kfree(pin); 1538 } else { 1539 pin->request_count--; 1540 } 1541 } 1542 } 1543} 1544 1545/** 1546 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1547 * @rdev: regulator_dev structure 1548 * @enable: enable GPIO at initial use? 1549 * 1550 * GPIO is enabled in case of initial use. (enable_count is 0) 1551 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1552 */ 1553static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1554{ 1555 struct regulator_enable_gpio *pin = rdev->ena_pin; 1556 1557 if (!pin) 1558 return -EINVAL; 1559 1560 if (enable) { 1561 /* Enable GPIO at initial use */ 1562 if (pin->enable_count == 0) 1563 gpio_set_value_cansleep(pin->gpio, 1564 !pin->ena_gpio_invert); 1565 1566 pin->enable_count++; 1567 } else { 1568 if (pin->enable_count > 1) { 1569 pin->enable_count--; 1570 return 0; 1571 } 1572 1573 /* Disable GPIO if not used */ 1574 if (pin->enable_count <= 1) { 1575 gpio_set_value_cansleep(pin->gpio, 1576 pin->ena_gpio_invert); 1577 pin->enable_count = 0; 1578 } 1579 } 1580 1581 return 0; 1582} 1583 1584static int _regulator_do_enable(struct regulator_dev *rdev) 1585{ 1586 int ret, delay; 1587 1588 /* Query before enabling in case configuration dependent. */ 1589 ret = _regulator_get_enable_time(rdev); 1590 if (ret >= 0) { 1591 delay = ret; 1592 } else { 1593 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1594 delay = 0; 1595 } 1596 1597 trace_regulator_enable(rdev_get_name(rdev)); 1598 1599 if (rdev->ena_pin) { 1600 ret = regulator_ena_gpio_ctrl(rdev, true); 1601 if (ret < 0) 1602 return ret; 1603 rdev->ena_gpio_state = 1; 1604 } else if (rdev->desc->ops->enable) { 1605 ret = rdev->desc->ops->enable(rdev); 1606 if (ret < 0) 1607 return ret; 1608 } else { 1609 return -EINVAL; 1610 } 1611 1612 /* Allow the regulator to ramp; it would be useful to extend 1613 * this for bulk operations so that the regulators can ramp 1614 * together. */ 1615 trace_regulator_enable_delay(rdev_get_name(rdev)); 1616 1617 if (delay >= 1000) { 1618 mdelay(delay / 1000); 1619 udelay(delay % 1000); 1620 } else if (delay) { 1621 udelay(delay); 1622 } 1623 1624 trace_regulator_enable_complete(rdev_get_name(rdev)); 1625 1626 return 0; 1627} 1628 1629/* locks held by regulator_enable() */ 1630static int _regulator_enable(struct regulator_dev *rdev) 1631{ 1632 int ret; 1633 1634 /* check voltage and requested load before enabling */ 1635 if (rdev->constraints && 1636 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1637 drms_uA_update(rdev); 1638 1639 if (rdev->use_count == 0) { 1640 /* The regulator may on if it's not switchable or left on */ 1641 ret = _regulator_is_enabled(rdev); 1642 if (ret == -EINVAL || ret == 0) { 1643 if (!_regulator_can_change_status(rdev)) 1644 return -EPERM; 1645 1646 ret = _regulator_do_enable(rdev); 1647 if (ret < 0) 1648 return ret; 1649 1650 } else if (ret < 0) { 1651 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1652 return ret; 1653 } 1654 /* Fallthrough on positive return values - already enabled */ 1655 } 1656 1657 rdev->use_count++; 1658 1659 return 0; 1660} 1661 1662/** 1663 * regulator_enable - enable regulator output 1664 * @regulator: regulator source 1665 * 1666 * Request that the regulator be enabled with the regulator output at 1667 * the predefined voltage or current value. Calls to regulator_enable() 1668 * must be balanced with calls to regulator_disable(). 1669 * 1670 * NOTE: the output value can be set by other drivers, boot loader or may be 1671 * hardwired in the regulator. 1672 */ 1673int regulator_enable(struct regulator *regulator) 1674{ 1675 struct regulator_dev *rdev = regulator->rdev; 1676 int ret = 0; 1677 1678 if (regulator->always_on) 1679 return 0; 1680 1681 if (rdev->supply) { 1682 ret = regulator_enable(rdev->supply); 1683 if (ret != 0) 1684 return ret; 1685 } 1686 1687 mutex_lock(&rdev->mutex); 1688 ret = _regulator_enable(rdev); 1689 mutex_unlock(&rdev->mutex); 1690 1691 if (ret != 0 && rdev->supply) 1692 regulator_disable(rdev->supply); 1693 1694 return ret; 1695} 1696EXPORT_SYMBOL_GPL(regulator_enable); 1697 1698static int _regulator_do_disable(struct regulator_dev *rdev) 1699{ 1700 int ret; 1701 1702 trace_regulator_disable(rdev_get_name(rdev)); 1703 1704 if (rdev->ena_pin) { 1705 ret = regulator_ena_gpio_ctrl(rdev, false); 1706 if (ret < 0) 1707 return ret; 1708 rdev->ena_gpio_state = 0; 1709 1710 } else if (rdev->desc->ops->disable) { 1711 ret = rdev->desc->ops->disable(rdev); 1712 if (ret != 0) 1713 return ret; 1714 } 1715 1716 trace_regulator_disable_complete(rdev_get_name(rdev)); 1717 1718 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1719 NULL); 1720 return 0; 1721} 1722 1723/* locks held by regulator_disable() */ 1724static int _regulator_disable(struct regulator_dev *rdev) 1725{ 1726 int ret = 0; 1727 1728 if (WARN(rdev->use_count <= 0, 1729 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1730 return -EIO; 1731 1732 /* are we the last user and permitted to disable ? */ 1733 if (rdev->use_count == 1 && 1734 (rdev->constraints && !rdev->constraints->always_on)) { 1735 1736 /* we are last user */ 1737 if (_regulator_can_change_status(rdev)) { 1738 ret = _regulator_do_disable(rdev); 1739 if (ret < 0) { 1740 rdev_err(rdev, "failed to disable\n"); 1741 return ret; 1742 } 1743 } 1744 1745 rdev->use_count = 0; 1746 } else if (rdev->use_count > 1) { 1747 1748 if (rdev->constraints && 1749 (rdev->constraints->valid_ops_mask & 1750 REGULATOR_CHANGE_DRMS)) 1751 drms_uA_update(rdev); 1752 1753 rdev->use_count--; 1754 } 1755 1756 return ret; 1757} 1758 1759/** 1760 * regulator_disable - disable regulator output 1761 * @regulator: regulator source 1762 * 1763 * Disable the regulator output voltage or current. Calls to 1764 * regulator_enable() must be balanced with calls to 1765 * regulator_disable(). 1766 * 1767 * NOTE: this will only disable the regulator output if no other consumer 1768 * devices have it enabled, the regulator device supports disabling and 1769 * machine constraints permit this operation. 1770 */ 1771int regulator_disable(struct regulator *regulator) 1772{ 1773 struct regulator_dev *rdev = regulator->rdev; 1774 int ret = 0; 1775 1776 if (regulator->always_on) 1777 return 0; 1778 1779 mutex_lock(&rdev->mutex); 1780 ret = _regulator_disable(rdev); 1781 mutex_unlock(&rdev->mutex); 1782 1783 if (ret == 0 && rdev->supply) 1784 regulator_disable(rdev->supply); 1785 1786 return ret; 1787} 1788EXPORT_SYMBOL_GPL(regulator_disable); 1789 1790/* locks held by regulator_force_disable() */ 1791static int _regulator_force_disable(struct regulator_dev *rdev) 1792{ 1793 int ret = 0; 1794 1795 /* force disable */ 1796 if (rdev->desc->ops->disable) { 1797 /* ah well, who wants to live forever... */ 1798 ret = rdev->desc->ops->disable(rdev); 1799 if (ret < 0) { 1800 rdev_err(rdev, "failed to force disable\n"); 1801 return ret; 1802 } 1803 /* notify other consumers that power has been forced off */ 1804 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1805 REGULATOR_EVENT_DISABLE, NULL); 1806 } 1807 1808 return ret; 1809} 1810 1811/** 1812 * regulator_force_disable - force disable regulator output 1813 * @regulator: regulator source 1814 * 1815 * Forcibly disable the regulator output voltage or current. 1816 * NOTE: this *will* disable the regulator output even if other consumer 1817 * devices have it enabled. This should be used for situations when device 1818 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1819 */ 1820int regulator_force_disable(struct regulator *regulator) 1821{ 1822 struct regulator_dev *rdev = regulator->rdev; 1823 int ret; 1824 1825 mutex_lock(&rdev->mutex); 1826 regulator->uA_load = 0; 1827 ret = _regulator_force_disable(regulator->rdev); 1828 mutex_unlock(&rdev->mutex); 1829 1830 if (rdev->supply) 1831 while (rdev->open_count--) 1832 regulator_disable(rdev->supply); 1833 1834 return ret; 1835} 1836EXPORT_SYMBOL_GPL(regulator_force_disable); 1837 1838static void regulator_disable_work(struct work_struct *work) 1839{ 1840 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1841 disable_work.work); 1842 int count, i, ret; 1843 1844 mutex_lock(&rdev->mutex); 1845 1846 BUG_ON(!rdev->deferred_disables); 1847 1848 count = rdev->deferred_disables; 1849 rdev->deferred_disables = 0; 1850 1851 for (i = 0; i < count; i++) { 1852 ret = _regulator_disable(rdev); 1853 if (ret != 0) 1854 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1855 } 1856 1857 mutex_unlock(&rdev->mutex); 1858 1859 if (rdev->supply) { 1860 for (i = 0; i < count; i++) { 1861 ret = regulator_disable(rdev->supply); 1862 if (ret != 0) { 1863 rdev_err(rdev, 1864 "Supply disable failed: %d\n", ret); 1865 } 1866 } 1867 } 1868} 1869 1870/** 1871 * regulator_disable_deferred - disable regulator output with delay 1872 * @regulator: regulator source 1873 * @ms: miliseconds until the regulator is disabled 1874 * 1875 * Execute regulator_disable() on the regulator after a delay. This 1876 * is intended for use with devices that require some time to quiesce. 1877 * 1878 * NOTE: this will only disable the regulator output if no other consumer 1879 * devices have it enabled, the regulator device supports disabling and 1880 * machine constraints permit this operation. 1881 */ 1882int regulator_disable_deferred(struct regulator *regulator, int ms) 1883{ 1884 struct regulator_dev *rdev = regulator->rdev; 1885 int ret; 1886 1887 if (regulator->always_on) 1888 return 0; 1889 1890 if (!ms) 1891 return regulator_disable(regulator); 1892 1893 mutex_lock(&rdev->mutex); 1894 rdev->deferred_disables++; 1895 mutex_unlock(&rdev->mutex); 1896 1897 ret = queue_delayed_work(system_power_efficient_wq, 1898 &rdev->disable_work, 1899 msecs_to_jiffies(ms)); 1900 if (ret < 0) 1901 return ret; 1902 else 1903 return 0; 1904} 1905EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1906 1907/** 1908 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1909 * 1910 * @rdev: regulator to operate on 1911 * 1912 * Regulators that use regmap for their register I/O can set the 1913 * enable_reg and enable_mask fields in their descriptor and then use 1914 * this as their is_enabled operation, saving some code. 1915 */ 1916int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1917{ 1918 unsigned int val; 1919 int ret; 1920 1921 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1922 if (ret != 0) 1923 return ret; 1924 1925 if (rdev->desc->enable_is_inverted) 1926 return (val & rdev->desc->enable_mask) == 0; 1927 else 1928 return (val & rdev->desc->enable_mask) != 0; 1929} 1930EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1931 1932/** 1933 * regulator_enable_regmap - standard enable() for regmap users 1934 * 1935 * @rdev: regulator to operate on 1936 * 1937 * Regulators that use regmap for their register I/O can set the 1938 * enable_reg and enable_mask fields in their descriptor and then use 1939 * this as their enable() operation, saving some code. 1940 */ 1941int regulator_enable_regmap(struct regulator_dev *rdev) 1942{ 1943 unsigned int val; 1944 1945 if (rdev->desc->enable_is_inverted) 1946 val = 0; 1947 else 1948 val = rdev->desc->enable_mask; 1949 1950 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1951 rdev->desc->enable_mask, val); 1952} 1953EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1954 1955/** 1956 * regulator_disable_regmap - standard disable() for regmap users 1957 * 1958 * @rdev: regulator to operate on 1959 * 1960 * Regulators that use regmap for their register I/O can set the 1961 * enable_reg and enable_mask fields in their descriptor and then use 1962 * this as their disable() operation, saving some code. 1963 */ 1964int regulator_disable_regmap(struct regulator_dev *rdev) 1965{ 1966 unsigned int val; 1967 1968 if (rdev->desc->enable_is_inverted) 1969 val = rdev->desc->enable_mask; 1970 else 1971 val = 0; 1972 1973 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1974 rdev->desc->enable_mask, val); 1975} 1976EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1977 1978static int _regulator_is_enabled(struct regulator_dev *rdev) 1979{ 1980 /* A GPIO control always takes precedence */ 1981 if (rdev->ena_pin) 1982 return rdev->ena_gpio_state; 1983 1984 /* If we don't know then assume that the regulator is always on */ 1985 if (!rdev->desc->ops->is_enabled) 1986 return 1; 1987 1988 return rdev->desc->ops->is_enabled(rdev); 1989} 1990 1991/** 1992 * regulator_is_enabled - is the regulator output enabled 1993 * @regulator: regulator source 1994 * 1995 * Returns positive if the regulator driver backing the source/client 1996 * has requested that the device be enabled, zero if it hasn't, else a 1997 * negative errno code. 1998 * 1999 * Note that the device backing this regulator handle can have multiple 2000 * users, so it might be enabled even if regulator_enable() was never 2001 * called for this particular source. 2002 */ 2003int regulator_is_enabled(struct regulator *regulator) 2004{ 2005 int ret; 2006 2007 if (regulator->always_on) 2008 return 1; 2009 2010 mutex_lock(®ulator->rdev->mutex); 2011 ret = _regulator_is_enabled(regulator->rdev); 2012 mutex_unlock(®ulator->rdev->mutex); 2013 2014 return ret; 2015} 2016EXPORT_SYMBOL_GPL(regulator_is_enabled); 2017 2018/** 2019 * regulator_can_change_voltage - check if regulator can change voltage 2020 * @regulator: regulator source 2021 * 2022 * Returns positive if the regulator driver backing the source/client 2023 * can change its voltage, false otherwise. Usefull for detecting fixed 2024 * or dummy regulators and disabling voltage change logic in the client 2025 * driver. 2026 */ 2027int regulator_can_change_voltage(struct regulator *regulator) 2028{ 2029 struct regulator_dev *rdev = regulator->rdev; 2030 2031 if (rdev->constraints && 2032 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2033 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2034 return 1; 2035 2036 if (rdev->desc->continuous_voltage_range && 2037 rdev->constraints->min_uV && rdev->constraints->max_uV && 2038 rdev->constraints->min_uV != rdev->constraints->max_uV) 2039 return 1; 2040 } 2041 2042 return 0; 2043} 2044EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2045 2046/** 2047 * regulator_count_voltages - count regulator_list_voltage() selectors 2048 * @regulator: regulator source 2049 * 2050 * Returns number of selectors, or negative errno. Selectors are 2051 * numbered starting at zero, and typically correspond to bitfields 2052 * in hardware registers. 2053 */ 2054int regulator_count_voltages(struct regulator *regulator) 2055{ 2056 struct regulator_dev *rdev = regulator->rdev; 2057 2058 return rdev->desc->n_voltages ? : -EINVAL; 2059} 2060EXPORT_SYMBOL_GPL(regulator_count_voltages); 2061 2062/** 2063 * regulator_list_voltage_linear - List voltages with simple calculation 2064 * 2065 * @rdev: Regulator device 2066 * @selector: Selector to convert into a voltage 2067 * 2068 * Regulators with a simple linear mapping between voltages and 2069 * selectors can set min_uV and uV_step in the regulator descriptor 2070 * and then use this function as their list_voltage() operation, 2071 */ 2072int regulator_list_voltage_linear(struct regulator_dev *rdev, 2073 unsigned int selector) 2074{ 2075 if (selector >= rdev->desc->n_voltages) 2076 return -EINVAL; 2077 if (selector < rdev->desc->linear_min_sel) 2078 return 0; 2079 2080 selector -= rdev->desc->linear_min_sel; 2081 2082 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 2083} 2084EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 2085 2086/** 2087 * regulator_list_voltage_table - List voltages with table based mapping 2088 * 2089 * @rdev: Regulator device 2090 * @selector: Selector to convert into a voltage 2091 * 2092 * Regulators with table based mapping between voltages and 2093 * selectors can set volt_table in the regulator descriptor 2094 * and then use this function as their list_voltage() operation. 2095 */ 2096int regulator_list_voltage_table(struct regulator_dev *rdev, 2097 unsigned int selector) 2098{ 2099 if (!rdev->desc->volt_table) { 2100 BUG_ON(!rdev->desc->volt_table); 2101 return -EINVAL; 2102 } 2103 2104 if (selector >= rdev->desc->n_voltages) 2105 return -EINVAL; 2106 2107 return rdev->desc->volt_table[selector]; 2108} 2109EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 2110 2111/** 2112 * regulator_list_voltage - enumerate supported voltages 2113 * @regulator: regulator source 2114 * @selector: identify voltage to list 2115 * Context: can sleep 2116 * 2117 * Returns a voltage that can be passed to @regulator_set_voltage(), 2118 * zero if this selector code can't be used on this system, or a 2119 * negative errno. 2120 */ 2121int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2122{ 2123 struct regulator_dev *rdev = regulator->rdev; 2124 struct regulator_ops *ops = rdev->desc->ops; 2125 int ret; 2126 2127 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2128 return -EINVAL; 2129 2130 mutex_lock(&rdev->mutex); 2131 ret = ops->list_voltage(rdev, selector); 2132 mutex_unlock(&rdev->mutex); 2133 2134 if (ret > 0) { 2135 if (ret < rdev->constraints->min_uV) 2136 ret = 0; 2137 else if (ret > rdev->constraints->max_uV) 2138 ret = 0; 2139 } 2140 2141 return ret; 2142} 2143EXPORT_SYMBOL_GPL(regulator_list_voltage); 2144 2145/** 2146 * regulator_get_linear_step - return the voltage step size between VSEL values 2147 * @regulator: regulator source 2148 * 2149 * Returns the voltage step size between VSEL values for linear 2150 * regulators, or return 0 if the regulator isn't a linear regulator. 2151 */ 2152unsigned int regulator_get_linear_step(struct regulator *regulator) 2153{ 2154 struct regulator_dev *rdev = regulator->rdev; 2155 2156 return rdev->desc->uV_step; 2157} 2158EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2159 2160/** 2161 * regulator_is_supported_voltage - check if a voltage range can be supported 2162 * 2163 * @regulator: Regulator to check. 2164 * @min_uV: Minimum required voltage in uV. 2165 * @max_uV: Maximum required voltage in uV. 2166 * 2167 * Returns a boolean or a negative error code. 2168 */ 2169int regulator_is_supported_voltage(struct regulator *regulator, 2170 int min_uV, int max_uV) 2171{ 2172 struct regulator_dev *rdev = regulator->rdev; 2173 int i, voltages, ret; 2174 2175 /* If we can't change voltage check the current voltage */ 2176 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2177 ret = regulator_get_voltage(regulator); 2178 if (ret >= 0) 2179 return (min_uV <= ret && ret <= max_uV); 2180 else 2181 return ret; 2182 } 2183 2184 /* Any voltage within constrains range is fine? */ 2185 if (rdev->desc->continuous_voltage_range) 2186 return min_uV >= rdev->constraints->min_uV && 2187 max_uV <= rdev->constraints->max_uV; 2188 2189 ret = regulator_count_voltages(regulator); 2190 if (ret < 0) 2191 return ret; 2192 voltages = ret; 2193 2194 for (i = 0; i < voltages; i++) { 2195 ret = regulator_list_voltage(regulator, i); 2196 2197 if (ret >= min_uV && ret <= max_uV) 2198 return 1; 2199 } 2200 2201 return 0; 2202} 2203EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2204 2205/** 2206 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 2207 * 2208 * @rdev: regulator to operate on 2209 * 2210 * Regulators that use regmap for their register I/O can set the 2211 * vsel_reg and vsel_mask fields in their descriptor and then use this 2212 * as their get_voltage_vsel operation, saving some code. 2213 */ 2214int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 2215{ 2216 unsigned int val; 2217 int ret; 2218 2219 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 2220 if (ret != 0) 2221 return ret; 2222 2223 val &= rdev->desc->vsel_mask; 2224 val >>= ffs(rdev->desc->vsel_mask) - 1; 2225 2226 return val; 2227} 2228EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 2229 2230/** 2231 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 2232 * 2233 * @rdev: regulator to operate on 2234 * @sel: Selector to set 2235 * 2236 * Regulators that use regmap for their register I/O can set the 2237 * vsel_reg and vsel_mask fields in their descriptor and then use this 2238 * as their set_voltage_vsel operation, saving some code. 2239 */ 2240int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 2241{ 2242 int ret; 2243 2244 sel <<= ffs(rdev->desc->vsel_mask) - 1; 2245 2246 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 2247 rdev->desc->vsel_mask, sel); 2248 if (ret) 2249 return ret; 2250 2251 if (rdev->desc->apply_bit) 2252 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg, 2253 rdev->desc->apply_bit, 2254 rdev->desc->apply_bit); 2255 return ret; 2256} 2257EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 2258 2259/** 2260 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 2261 * 2262 * @rdev: Regulator to operate on 2263 * @min_uV: Lower bound for voltage 2264 * @max_uV: Upper bound for voltage 2265 * 2266 * Drivers implementing set_voltage_sel() and list_voltage() can use 2267 * this as their map_voltage() operation. It will find a suitable 2268 * voltage by calling list_voltage() until it gets something in bounds 2269 * for the requested voltages. 2270 */ 2271int regulator_map_voltage_iterate(struct regulator_dev *rdev, 2272 int min_uV, int max_uV) 2273{ 2274 int best_val = INT_MAX; 2275 int selector = 0; 2276 int i, ret; 2277 2278 /* Find the smallest voltage that falls within the specified 2279 * range. 2280 */ 2281 for (i = 0; i < rdev->desc->n_voltages; i++) { 2282 ret = rdev->desc->ops->list_voltage(rdev, i); 2283 if (ret < 0) 2284 continue; 2285 2286 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 2287 best_val = ret; 2288 selector = i; 2289 } 2290 } 2291 2292 if (best_val != INT_MAX) 2293 return selector; 2294 else 2295 return -EINVAL; 2296} 2297EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2298 2299/** 2300 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list 2301 * 2302 * @rdev: Regulator to operate on 2303 * @min_uV: Lower bound for voltage 2304 * @max_uV: Upper bound for voltage 2305 * 2306 * Drivers that have ascendant voltage list can use this as their 2307 * map_voltage() operation. 2308 */ 2309int regulator_map_voltage_ascend(struct regulator_dev *rdev, 2310 int min_uV, int max_uV) 2311{ 2312 int i, ret; 2313 2314 for (i = 0; i < rdev->desc->n_voltages; i++) { 2315 ret = rdev->desc->ops->list_voltage(rdev, i); 2316 if (ret < 0) 2317 continue; 2318 2319 if (ret > max_uV) 2320 break; 2321 2322 if (ret >= min_uV && ret <= max_uV) 2323 return i; 2324 } 2325 2326 return -EINVAL; 2327} 2328EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend); 2329 2330/** 2331 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2332 * 2333 * @rdev: Regulator to operate on 2334 * @min_uV: Lower bound for voltage 2335 * @max_uV: Upper bound for voltage 2336 * 2337 * Drivers providing min_uV and uV_step in their regulator_desc can 2338 * use this as their map_voltage() operation. 2339 */ 2340int regulator_map_voltage_linear(struct regulator_dev *rdev, 2341 int min_uV, int max_uV) 2342{ 2343 int ret, voltage; 2344 2345 /* Allow uV_step to be 0 for fixed voltage */ 2346 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) { 2347 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV) 2348 return 0; 2349 else 2350 return -EINVAL; 2351 } 2352 2353 if (!rdev->desc->uV_step) { 2354 BUG_ON(!rdev->desc->uV_step); 2355 return -EINVAL; 2356 } 2357 2358 if (min_uV < rdev->desc->min_uV) 2359 min_uV = rdev->desc->min_uV; 2360 2361 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2362 if (ret < 0) 2363 return ret; 2364 2365 ret += rdev->desc->linear_min_sel; 2366 2367 /* Map back into a voltage to verify we're still in bounds */ 2368 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2369 if (voltage < min_uV || voltage > max_uV) 2370 return -EINVAL; 2371 2372 return ret; 2373} 2374EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2375 2376static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2377 int min_uV, int max_uV) 2378{ 2379 int ret; 2380 int delay = 0; 2381 int best_val = 0; 2382 unsigned int selector; 2383 int old_selector = -1; 2384 2385 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2386 2387 min_uV += rdev->constraints->uV_offset; 2388 max_uV += rdev->constraints->uV_offset; 2389 2390 /* 2391 * If we can't obtain the old selector there is not enough 2392 * info to call set_voltage_time_sel(). 2393 */ 2394 if (_regulator_is_enabled(rdev) && 2395 rdev->desc->ops->set_voltage_time_sel && 2396 rdev->desc->ops->get_voltage_sel) { 2397 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2398 if (old_selector < 0) 2399 return old_selector; 2400 } 2401 2402 if (rdev->desc->ops->set_voltage) { 2403 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2404 &selector); 2405 2406 if (ret >= 0) { 2407 if (rdev->desc->ops->list_voltage) 2408 best_val = rdev->desc->ops->list_voltage(rdev, 2409 selector); 2410 else 2411 best_val = _regulator_get_voltage(rdev); 2412 } 2413 2414 } else if (rdev->desc->ops->set_voltage_sel) { 2415 if (rdev->desc->ops->map_voltage) { 2416 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2417 max_uV); 2418 } else { 2419 if (rdev->desc->ops->list_voltage == 2420 regulator_list_voltage_linear) 2421 ret = regulator_map_voltage_linear(rdev, 2422 min_uV, max_uV); 2423 else 2424 ret = regulator_map_voltage_iterate(rdev, 2425 min_uV, max_uV); 2426 } 2427 2428 if (ret >= 0) { 2429 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2430 if (min_uV <= best_val && max_uV >= best_val) { 2431 selector = ret; 2432 if (old_selector == selector) 2433 ret = 0; 2434 else 2435 ret = rdev->desc->ops->set_voltage_sel( 2436 rdev, ret); 2437 } else { 2438 ret = -EINVAL; 2439 } 2440 } 2441 } else { 2442 ret = -EINVAL; 2443 } 2444 2445 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2446 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2447 old_selector != selector && rdev->desc->ops->set_voltage_time_sel) { 2448 2449 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2450 old_selector, selector); 2451 if (delay < 0) { 2452 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2453 delay); 2454 delay = 0; 2455 } 2456 2457 /* Insert any necessary delays */ 2458 if (delay >= 1000) { 2459 mdelay(delay / 1000); 2460 udelay(delay % 1000); 2461 } else if (delay) { 2462 udelay(delay); 2463 } 2464 } 2465 2466 if (ret == 0 && best_val >= 0) { 2467 unsigned long data = best_val; 2468 2469 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2470 (void *)data); 2471 } 2472 2473 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2474 2475 return ret; 2476} 2477 2478/** 2479 * regulator_set_voltage - set regulator output voltage 2480 * @regulator: regulator source 2481 * @min_uV: Minimum required voltage in uV 2482 * @max_uV: Maximum acceptable voltage in uV 2483 * 2484 * Sets a voltage regulator to the desired output voltage. This can be set 2485 * during any regulator state. IOW, regulator can be disabled or enabled. 2486 * 2487 * If the regulator is enabled then the voltage will change to the new value 2488 * immediately otherwise if the regulator is disabled the regulator will 2489 * output at the new voltage when enabled. 2490 * 2491 * NOTE: If the regulator is shared between several devices then the lowest 2492 * request voltage that meets the system constraints will be used. 2493 * Regulator system constraints must be set for this regulator before 2494 * calling this function otherwise this call will fail. 2495 */ 2496int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2497{ 2498 struct regulator_dev *rdev = regulator->rdev; 2499 int ret = 0; 2500 int old_min_uV, old_max_uV; 2501 2502 mutex_lock(&rdev->mutex); 2503 2504 /* If we're setting the same range as last time the change 2505 * should be a noop (some cpufreq implementations use the same 2506 * voltage for multiple frequencies, for example). 2507 */ 2508 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2509 goto out; 2510 2511 /* sanity check */ 2512 if (!rdev->desc->ops->set_voltage && 2513 !rdev->desc->ops->set_voltage_sel) { 2514 ret = -EINVAL; 2515 goto out; 2516 } 2517 2518 /* constraints check */ 2519 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2520 if (ret < 0) 2521 goto out; 2522 2523 /* restore original values in case of error */ 2524 old_min_uV = regulator->min_uV; 2525 old_max_uV = regulator->max_uV; 2526 regulator->min_uV = min_uV; 2527 regulator->max_uV = max_uV; 2528 2529 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2530 if (ret < 0) 2531 goto out2; 2532 2533 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2534 if (ret < 0) 2535 goto out2; 2536 2537out: 2538 mutex_unlock(&rdev->mutex); 2539 return ret; 2540out2: 2541 regulator->min_uV = old_min_uV; 2542 regulator->max_uV = old_max_uV; 2543 mutex_unlock(&rdev->mutex); 2544 return ret; 2545} 2546EXPORT_SYMBOL_GPL(regulator_set_voltage); 2547 2548/** 2549 * regulator_set_voltage_time - get raise/fall time 2550 * @regulator: regulator source 2551 * @old_uV: starting voltage in microvolts 2552 * @new_uV: target voltage in microvolts 2553 * 2554 * Provided with the starting and ending voltage, this function attempts to 2555 * calculate the time in microseconds required to rise or fall to this new 2556 * voltage. 2557 */ 2558int regulator_set_voltage_time(struct regulator *regulator, 2559 int old_uV, int new_uV) 2560{ 2561 struct regulator_dev *rdev = regulator->rdev; 2562 struct regulator_ops *ops = rdev->desc->ops; 2563 int old_sel = -1; 2564 int new_sel = -1; 2565 int voltage; 2566 int i; 2567 2568 /* Currently requires operations to do this */ 2569 if (!ops->list_voltage || !ops->set_voltage_time_sel 2570 || !rdev->desc->n_voltages) 2571 return -EINVAL; 2572 2573 for (i = 0; i < rdev->desc->n_voltages; i++) { 2574 /* We only look for exact voltage matches here */ 2575 voltage = regulator_list_voltage(regulator, i); 2576 if (voltage < 0) 2577 return -EINVAL; 2578 if (voltage == 0) 2579 continue; 2580 if (voltage == old_uV) 2581 old_sel = i; 2582 if (voltage == new_uV) 2583 new_sel = i; 2584 } 2585 2586 if (old_sel < 0 || new_sel < 0) 2587 return -EINVAL; 2588 2589 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2590} 2591EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2592 2593/** 2594 * regulator_set_voltage_time_sel - get raise/fall time 2595 * @rdev: regulator source device 2596 * @old_selector: selector for starting voltage 2597 * @new_selector: selector for target voltage 2598 * 2599 * Provided with the starting and target voltage selectors, this function 2600 * returns time in microseconds required to rise or fall to this new voltage 2601 * 2602 * Drivers providing ramp_delay in regulation_constraints can use this as their 2603 * set_voltage_time_sel() operation. 2604 */ 2605int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2606 unsigned int old_selector, 2607 unsigned int new_selector) 2608{ 2609 unsigned int ramp_delay = 0; 2610 int old_volt, new_volt; 2611 2612 if (rdev->constraints->ramp_delay) 2613 ramp_delay = rdev->constraints->ramp_delay; 2614 else if (rdev->desc->ramp_delay) 2615 ramp_delay = rdev->desc->ramp_delay; 2616 2617 if (ramp_delay == 0) { 2618 rdev_warn(rdev, "ramp_delay not set\n"); 2619 return 0; 2620 } 2621 2622 /* sanity check */ 2623 if (!rdev->desc->ops->list_voltage) 2624 return -EINVAL; 2625 2626 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2627 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2628 2629 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2630} 2631EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2632 2633/** 2634 * regulator_sync_voltage - re-apply last regulator output voltage 2635 * @regulator: regulator source 2636 * 2637 * Re-apply the last configured voltage. This is intended to be used 2638 * where some external control source the consumer is cooperating with 2639 * has caused the configured voltage to change. 2640 */ 2641int regulator_sync_voltage(struct regulator *regulator) 2642{ 2643 struct regulator_dev *rdev = regulator->rdev; 2644 int ret, min_uV, max_uV; 2645 2646 mutex_lock(&rdev->mutex); 2647 2648 if (!rdev->desc->ops->set_voltage && 2649 !rdev->desc->ops->set_voltage_sel) { 2650 ret = -EINVAL; 2651 goto out; 2652 } 2653 2654 /* This is only going to work if we've had a voltage configured. */ 2655 if (!regulator->min_uV && !regulator->max_uV) { 2656 ret = -EINVAL; 2657 goto out; 2658 } 2659 2660 min_uV = regulator->min_uV; 2661 max_uV = regulator->max_uV; 2662 2663 /* This should be a paranoia check... */ 2664 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2665 if (ret < 0) 2666 goto out; 2667 2668 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2669 if (ret < 0) 2670 goto out; 2671 2672 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2673 2674out: 2675 mutex_unlock(&rdev->mutex); 2676 return ret; 2677} 2678EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2679 2680static int _regulator_get_voltage(struct regulator_dev *rdev) 2681{ 2682 int sel, ret; 2683 2684 if (rdev->desc->ops->get_voltage_sel) { 2685 sel = rdev->desc->ops->get_voltage_sel(rdev); 2686 if (sel < 0) 2687 return sel; 2688 ret = rdev->desc->ops->list_voltage(rdev, sel); 2689 } else if (rdev->desc->ops->get_voltage) { 2690 ret = rdev->desc->ops->get_voltage(rdev); 2691 } else if (rdev->desc->ops->list_voltage) { 2692 ret = rdev->desc->ops->list_voltage(rdev, 0); 2693 } else { 2694 return -EINVAL; 2695 } 2696 2697 if (ret < 0) 2698 return ret; 2699 return ret - rdev->constraints->uV_offset; 2700} 2701 2702/** 2703 * regulator_get_voltage - get regulator output voltage 2704 * @regulator: regulator source 2705 * 2706 * This returns the current regulator voltage in uV. 2707 * 2708 * NOTE: If the regulator is disabled it will return the voltage value. This 2709 * function should not be used to determine regulator state. 2710 */ 2711int regulator_get_voltage(struct regulator *regulator) 2712{ 2713 int ret; 2714 2715 mutex_lock(®ulator->rdev->mutex); 2716 2717 ret = _regulator_get_voltage(regulator->rdev); 2718 2719 mutex_unlock(®ulator->rdev->mutex); 2720 2721 return ret; 2722} 2723EXPORT_SYMBOL_GPL(regulator_get_voltage); 2724 2725/** 2726 * regulator_set_current_limit - set regulator output current limit 2727 * @regulator: regulator source 2728 * @min_uA: Minimum supported current in uA 2729 * @max_uA: Maximum supported current in uA 2730 * 2731 * Sets current sink to the desired output current. This can be set during 2732 * any regulator state. IOW, regulator can be disabled or enabled. 2733 * 2734 * If the regulator is enabled then the current will change to the new value 2735 * immediately otherwise if the regulator is disabled the regulator will 2736 * output at the new current when enabled. 2737 * 2738 * NOTE: Regulator system constraints must be set for this regulator before 2739 * calling this function otherwise this call will fail. 2740 */ 2741int regulator_set_current_limit(struct regulator *regulator, 2742 int min_uA, int max_uA) 2743{ 2744 struct regulator_dev *rdev = regulator->rdev; 2745 int ret; 2746 2747 mutex_lock(&rdev->mutex); 2748 2749 /* sanity check */ 2750 if (!rdev->desc->ops->set_current_limit) { 2751 ret = -EINVAL; 2752 goto out; 2753 } 2754 2755 /* constraints check */ 2756 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2757 if (ret < 0) 2758 goto out; 2759 2760 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2761out: 2762 mutex_unlock(&rdev->mutex); 2763 return ret; 2764} 2765EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2766 2767static int _regulator_get_current_limit(struct regulator_dev *rdev) 2768{ 2769 int ret; 2770 2771 mutex_lock(&rdev->mutex); 2772 2773 /* sanity check */ 2774 if (!rdev->desc->ops->get_current_limit) { 2775 ret = -EINVAL; 2776 goto out; 2777 } 2778 2779 ret = rdev->desc->ops->get_current_limit(rdev); 2780out: 2781 mutex_unlock(&rdev->mutex); 2782 return ret; 2783} 2784 2785/** 2786 * regulator_get_current_limit - get regulator output current 2787 * @regulator: regulator source 2788 * 2789 * This returns the current supplied by the specified current sink in uA. 2790 * 2791 * NOTE: If the regulator is disabled it will return the current value. This 2792 * function should not be used to determine regulator state. 2793 */ 2794int regulator_get_current_limit(struct regulator *regulator) 2795{ 2796 return _regulator_get_current_limit(regulator->rdev); 2797} 2798EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2799 2800/** 2801 * regulator_set_mode - set regulator operating mode 2802 * @regulator: regulator source 2803 * @mode: operating mode - one of the REGULATOR_MODE constants 2804 * 2805 * Set regulator operating mode to increase regulator efficiency or improve 2806 * regulation performance. 2807 * 2808 * NOTE: Regulator system constraints must be set for this regulator before 2809 * calling this function otherwise this call will fail. 2810 */ 2811int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2812{ 2813 struct regulator_dev *rdev = regulator->rdev; 2814 int ret; 2815 int regulator_curr_mode; 2816 2817 mutex_lock(&rdev->mutex); 2818 2819 /* sanity check */ 2820 if (!rdev->desc->ops->set_mode) { 2821 ret = -EINVAL; 2822 goto out; 2823 } 2824 2825 /* return if the same mode is requested */ 2826 if (rdev->desc->ops->get_mode) { 2827 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2828 if (regulator_curr_mode == mode) { 2829 ret = 0; 2830 goto out; 2831 } 2832 } 2833 2834 /* constraints check */ 2835 ret = regulator_mode_constrain(rdev, &mode); 2836 if (ret < 0) 2837 goto out; 2838 2839 ret = rdev->desc->ops->set_mode(rdev, mode); 2840out: 2841 mutex_unlock(&rdev->mutex); 2842 return ret; 2843} 2844EXPORT_SYMBOL_GPL(regulator_set_mode); 2845 2846static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2847{ 2848 int ret; 2849 2850 mutex_lock(&rdev->mutex); 2851 2852 /* sanity check */ 2853 if (!rdev->desc->ops->get_mode) { 2854 ret = -EINVAL; 2855 goto out; 2856 } 2857 2858 ret = rdev->desc->ops->get_mode(rdev); 2859out: 2860 mutex_unlock(&rdev->mutex); 2861 return ret; 2862} 2863 2864/** 2865 * regulator_get_mode - get regulator operating mode 2866 * @regulator: regulator source 2867 * 2868 * Get the current regulator operating mode. 2869 */ 2870unsigned int regulator_get_mode(struct regulator *regulator) 2871{ 2872 return _regulator_get_mode(regulator->rdev); 2873} 2874EXPORT_SYMBOL_GPL(regulator_get_mode); 2875 2876/** 2877 * regulator_set_optimum_mode - set regulator optimum operating mode 2878 * @regulator: regulator source 2879 * @uA_load: load current 2880 * 2881 * Notifies the regulator core of a new device load. This is then used by 2882 * DRMS (if enabled by constraints) to set the most efficient regulator 2883 * operating mode for the new regulator loading. 2884 * 2885 * Consumer devices notify their supply regulator of the maximum power 2886 * they will require (can be taken from device datasheet in the power 2887 * consumption tables) when they change operational status and hence power 2888 * state. Examples of operational state changes that can affect power 2889 * consumption are :- 2890 * 2891 * o Device is opened / closed. 2892 * o Device I/O is about to begin or has just finished. 2893 * o Device is idling in between work. 2894 * 2895 * This information is also exported via sysfs to userspace. 2896 * 2897 * DRMS will sum the total requested load on the regulator and change 2898 * to the most efficient operating mode if platform constraints allow. 2899 * 2900 * Returns the new regulator mode or error. 2901 */ 2902int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2903{ 2904 struct regulator_dev *rdev = regulator->rdev; 2905 struct regulator *consumer; 2906 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2907 unsigned int mode; 2908 2909 if (rdev->supply) 2910 input_uV = regulator_get_voltage(rdev->supply); 2911 2912 mutex_lock(&rdev->mutex); 2913 2914 /* 2915 * first check to see if we can set modes at all, otherwise just 2916 * tell the consumer everything is OK. 2917 */ 2918 regulator->uA_load = uA_load; 2919 ret = regulator_check_drms(rdev); 2920 if (ret < 0) { 2921 ret = 0; 2922 goto out; 2923 } 2924 2925 if (!rdev->desc->ops->get_optimum_mode) 2926 goto out; 2927 2928 /* 2929 * we can actually do this so any errors are indicators of 2930 * potential real failure. 2931 */ 2932 ret = -EINVAL; 2933 2934 if (!rdev->desc->ops->set_mode) 2935 goto out; 2936 2937 /* get output voltage */ 2938 output_uV = _regulator_get_voltage(rdev); 2939 if (output_uV <= 0) { 2940 rdev_err(rdev, "invalid output voltage found\n"); 2941 goto out; 2942 } 2943 2944 /* No supply? Use constraint voltage */ 2945 if (input_uV <= 0) 2946 input_uV = rdev->constraints->input_uV; 2947 if (input_uV <= 0) { 2948 rdev_err(rdev, "invalid input voltage found\n"); 2949 goto out; 2950 } 2951 2952 /* calc total requested load for this regulator */ 2953 list_for_each_entry(consumer, &rdev->consumer_list, list) 2954 total_uA_load += consumer->uA_load; 2955 2956 mode = rdev->desc->ops->get_optimum_mode(rdev, 2957 input_uV, output_uV, 2958 total_uA_load); 2959 ret = regulator_mode_constrain(rdev, &mode); 2960 if (ret < 0) { 2961 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2962 total_uA_load, input_uV, output_uV); 2963 goto out; 2964 } 2965 2966 ret = rdev->desc->ops->set_mode(rdev, mode); 2967 if (ret < 0) { 2968 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2969 goto out; 2970 } 2971 ret = mode; 2972out: 2973 mutex_unlock(&rdev->mutex); 2974 return ret; 2975} 2976EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2977 2978/** 2979 * regulator_set_bypass_regmap - Default set_bypass() using regmap 2980 * 2981 * @rdev: device to operate on. 2982 * @enable: state to set. 2983 */ 2984int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable) 2985{ 2986 unsigned int val; 2987 2988 if (enable) 2989 val = rdev->desc->bypass_mask; 2990 else 2991 val = 0; 2992 2993 return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg, 2994 rdev->desc->bypass_mask, val); 2995} 2996EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap); 2997 2998/** 2999 * regulator_get_bypass_regmap - Default get_bypass() using regmap 3000 * 3001 * @rdev: device to operate on. 3002 * @enable: current state. 3003 */ 3004int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable) 3005{ 3006 unsigned int val; 3007 int ret; 3008 3009 ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val); 3010 if (ret != 0) 3011 return ret; 3012 3013 *enable = val & rdev->desc->bypass_mask; 3014 3015 return 0; 3016} 3017EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap); 3018 3019/** 3020 * regulator_allow_bypass - allow the regulator to go into bypass mode 3021 * 3022 * @regulator: Regulator to configure 3023 * @enable: enable or disable bypass mode 3024 * 3025 * Allow the regulator to go into bypass mode if all other consumers 3026 * for the regulator also enable bypass mode and the machine 3027 * constraints allow this. Bypass mode means that the regulator is 3028 * simply passing the input directly to the output with no regulation. 3029 */ 3030int regulator_allow_bypass(struct regulator *regulator, bool enable) 3031{ 3032 struct regulator_dev *rdev = regulator->rdev; 3033 int ret = 0; 3034 3035 if (!rdev->desc->ops->set_bypass) 3036 return 0; 3037 3038 if (rdev->constraints && 3039 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 3040 return 0; 3041 3042 mutex_lock(&rdev->mutex); 3043 3044 if (enable && !regulator->bypass) { 3045 rdev->bypass_count++; 3046 3047 if (rdev->bypass_count == rdev->open_count) { 3048 ret = rdev->desc->ops->set_bypass(rdev, enable); 3049 if (ret != 0) 3050 rdev->bypass_count--; 3051 } 3052 3053 } else if (!enable && regulator->bypass) { 3054 rdev->bypass_count--; 3055 3056 if (rdev->bypass_count != rdev->open_count) { 3057 ret = rdev->desc->ops->set_bypass(rdev, enable); 3058 if (ret != 0) 3059 rdev->bypass_count++; 3060 } 3061 } 3062 3063 if (ret == 0) 3064 regulator->bypass = enable; 3065 3066 mutex_unlock(&rdev->mutex); 3067 3068 return ret; 3069} 3070EXPORT_SYMBOL_GPL(regulator_allow_bypass); 3071 3072/** 3073 * regulator_register_notifier - register regulator event notifier 3074 * @regulator: regulator source 3075 * @nb: notifier block 3076 * 3077 * Register notifier block to receive regulator events. 3078 */ 3079int regulator_register_notifier(struct regulator *regulator, 3080 struct notifier_block *nb) 3081{ 3082 return blocking_notifier_chain_register(®ulator->rdev->notifier, 3083 nb); 3084} 3085EXPORT_SYMBOL_GPL(regulator_register_notifier); 3086 3087/** 3088 * regulator_unregister_notifier - unregister regulator event notifier 3089 * @regulator: regulator source 3090 * @nb: notifier block 3091 * 3092 * Unregister regulator event notifier block. 3093 */ 3094int regulator_unregister_notifier(struct regulator *regulator, 3095 struct notifier_block *nb) 3096{ 3097 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 3098 nb); 3099} 3100EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 3101 3102/* notify regulator consumers and downstream regulator consumers. 3103 * Note mutex must be held by caller. 3104 */ 3105static void _notifier_call_chain(struct regulator_dev *rdev, 3106 unsigned long event, void *data) 3107{ 3108 /* call rdev chain first */ 3109 blocking_notifier_call_chain(&rdev->notifier, event, data); 3110} 3111 3112/** 3113 * regulator_bulk_get - get multiple regulator consumers 3114 * 3115 * @dev: Device to supply 3116 * @num_consumers: Number of consumers to register 3117 * @consumers: Configuration of consumers; clients are stored here. 3118 * 3119 * @return 0 on success, an errno on failure. 3120 * 3121 * This helper function allows drivers to get several regulator 3122 * consumers in one operation. If any of the regulators cannot be 3123 * acquired then any regulators that were allocated will be freed 3124 * before returning to the caller. 3125 */ 3126int regulator_bulk_get(struct device *dev, int num_consumers, 3127 struct regulator_bulk_data *consumers) 3128{ 3129 int i; 3130 int ret; 3131 3132 for (i = 0; i < num_consumers; i++) 3133 consumers[i].consumer = NULL; 3134 3135 for (i = 0; i < num_consumers; i++) { 3136 consumers[i].consumer = regulator_get(dev, 3137 consumers[i].supply); 3138 if (IS_ERR(consumers[i].consumer)) { 3139 ret = PTR_ERR(consumers[i].consumer); 3140 dev_err(dev, "Failed to get supply '%s': %d\n", 3141 consumers[i].supply, ret); 3142 consumers[i].consumer = NULL; 3143 goto err; 3144 } 3145 } 3146 3147 return 0; 3148 3149err: 3150 while (--i >= 0) 3151 regulator_put(consumers[i].consumer); 3152 3153 return ret; 3154} 3155EXPORT_SYMBOL_GPL(regulator_bulk_get); 3156 3157/** 3158 * devm_regulator_bulk_get - managed get multiple regulator consumers 3159 * 3160 * @dev: Device to supply 3161 * @num_consumers: Number of consumers to register 3162 * @consumers: Configuration of consumers; clients are stored here. 3163 * 3164 * @return 0 on success, an errno on failure. 3165 * 3166 * This helper function allows drivers to get several regulator 3167 * consumers in one operation with management, the regulators will 3168 * automatically be freed when the device is unbound. If any of the 3169 * regulators cannot be acquired then any regulators that were 3170 * allocated will be freed before returning to the caller. 3171 */ 3172int devm_regulator_bulk_get(struct device *dev, int num_consumers, 3173 struct regulator_bulk_data *consumers) 3174{ 3175 int i; 3176 int ret; 3177 3178 for (i = 0; i < num_consumers; i++) 3179 consumers[i].consumer = NULL; 3180 3181 for (i = 0; i < num_consumers; i++) { 3182 consumers[i].consumer = devm_regulator_get(dev, 3183 consumers[i].supply); 3184 if (IS_ERR(consumers[i].consumer)) { 3185 ret = PTR_ERR(consumers[i].consumer); 3186 dev_err(dev, "Failed to get supply '%s': %d\n", 3187 consumers[i].supply, ret); 3188 consumers[i].consumer = NULL; 3189 goto err; 3190 } 3191 } 3192 3193 return 0; 3194 3195err: 3196 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 3197 devm_regulator_put(consumers[i].consumer); 3198 3199 return ret; 3200} 3201EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 3202 3203static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 3204{ 3205 struct regulator_bulk_data *bulk = data; 3206 3207 bulk->ret = regulator_enable(bulk->consumer); 3208} 3209 3210/** 3211 * regulator_bulk_enable - enable multiple regulator consumers 3212 * 3213 * @num_consumers: Number of consumers 3214 * @consumers: Consumer data; clients are stored here. 3215 * @return 0 on success, an errno on failure 3216 * 3217 * This convenience API allows consumers to enable multiple regulator 3218 * clients in a single API call. If any consumers cannot be enabled 3219 * then any others that were enabled will be disabled again prior to 3220 * return. 3221 */ 3222int regulator_bulk_enable(int num_consumers, 3223 struct regulator_bulk_data *consumers) 3224{ 3225 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 3226 int i; 3227 int ret = 0; 3228 3229 for (i = 0; i < num_consumers; i++) { 3230 if (consumers[i].consumer->always_on) 3231 consumers[i].ret = 0; 3232 else 3233 async_schedule_domain(regulator_bulk_enable_async, 3234 &consumers[i], &async_domain); 3235 } 3236 3237 async_synchronize_full_domain(&async_domain); 3238 3239 /* If any consumer failed we need to unwind any that succeeded */ 3240 for (i = 0; i < num_consumers; i++) { 3241 if (consumers[i].ret != 0) { 3242 ret = consumers[i].ret; 3243 goto err; 3244 } 3245 } 3246 3247 return 0; 3248 3249err: 3250 for (i = 0; i < num_consumers; i++) { 3251 if (consumers[i].ret < 0) 3252 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3253 consumers[i].ret); 3254 else 3255 regulator_disable(consumers[i].consumer); 3256 } 3257 3258 return ret; 3259} 3260EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3261 3262/** 3263 * regulator_bulk_disable - disable multiple regulator consumers 3264 * 3265 * @num_consumers: Number of consumers 3266 * @consumers: Consumer data; clients are stored here. 3267 * @return 0 on success, an errno on failure 3268 * 3269 * This convenience API allows consumers to disable multiple regulator 3270 * clients in a single API call. If any consumers cannot be disabled 3271 * then any others that were disabled will be enabled again prior to 3272 * return. 3273 */ 3274int regulator_bulk_disable(int num_consumers, 3275 struct regulator_bulk_data *consumers) 3276{ 3277 int i; 3278 int ret, r; 3279 3280 for (i = num_consumers - 1; i >= 0; --i) { 3281 ret = regulator_disable(consumers[i].consumer); 3282 if (ret != 0) 3283 goto err; 3284 } 3285 3286 return 0; 3287 3288err: 3289 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3290 for (++i; i < num_consumers; ++i) { 3291 r = regulator_enable(consumers[i].consumer); 3292 if (r != 0) 3293 pr_err("Failed to reename %s: %d\n", 3294 consumers[i].supply, r); 3295 } 3296 3297 return ret; 3298} 3299EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3300 3301/** 3302 * regulator_bulk_force_disable - force disable multiple regulator consumers 3303 * 3304 * @num_consumers: Number of consumers 3305 * @consumers: Consumer data; clients are stored here. 3306 * @return 0 on success, an errno on failure 3307 * 3308 * This convenience API allows consumers to forcibly disable multiple regulator 3309 * clients in a single API call. 3310 * NOTE: This should be used for situations when device damage will 3311 * likely occur if the regulators are not disabled (e.g. over temp). 3312 * Although regulator_force_disable function call for some consumers can 3313 * return error numbers, the function is called for all consumers. 3314 */ 3315int regulator_bulk_force_disable(int num_consumers, 3316 struct regulator_bulk_data *consumers) 3317{ 3318 int i; 3319 int ret; 3320 3321 for (i = 0; i < num_consumers; i++) 3322 consumers[i].ret = 3323 regulator_force_disable(consumers[i].consumer); 3324 3325 for (i = 0; i < num_consumers; i++) { 3326 if (consumers[i].ret != 0) { 3327 ret = consumers[i].ret; 3328 goto out; 3329 } 3330 } 3331 3332 return 0; 3333out: 3334 return ret; 3335} 3336EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3337 3338/** 3339 * regulator_bulk_free - free multiple regulator consumers 3340 * 3341 * @num_consumers: Number of consumers 3342 * @consumers: Consumer data; clients are stored here. 3343 * 3344 * This convenience API allows consumers to free multiple regulator 3345 * clients in a single API call. 3346 */ 3347void regulator_bulk_free(int num_consumers, 3348 struct regulator_bulk_data *consumers) 3349{ 3350 int i; 3351 3352 for (i = 0; i < num_consumers; i++) { 3353 regulator_put(consumers[i].consumer); 3354 consumers[i].consumer = NULL; 3355 } 3356} 3357EXPORT_SYMBOL_GPL(regulator_bulk_free); 3358 3359/** 3360 * regulator_notifier_call_chain - call regulator event notifier 3361 * @rdev: regulator source 3362 * @event: notifier block 3363 * @data: callback-specific data. 3364 * 3365 * Called by regulator drivers to notify clients a regulator event has 3366 * occurred. We also notify regulator clients downstream. 3367 * Note lock must be held by caller. 3368 */ 3369int regulator_notifier_call_chain(struct regulator_dev *rdev, 3370 unsigned long event, void *data) 3371{ 3372 _notifier_call_chain(rdev, event, data); 3373 return NOTIFY_DONE; 3374 3375} 3376EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3377 3378/** 3379 * regulator_mode_to_status - convert a regulator mode into a status 3380 * 3381 * @mode: Mode to convert 3382 * 3383 * Convert a regulator mode into a status. 3384 */ 3385int regulator_mode_to_status(unsigned int mode) 3386{ 3387 switch (mode) { 3388 case REGULATOR_MODE_FAST: 3389 return REGULATOR_STATUS_FAST; 3390 case REGULATOR_MODE_NORMAL: 3391 return REGULATOR_STATUS_NORMAL; 3392 case REGULATOR_MODE_IDLE: 3393 return REGULATOR_STATUS_IDLE; 3394 case REGULATOR_MODE_STANDBY: 3395 return REGULATOR_STATUS_STANDBY; 3396 default: 3397 return REGULATOR_STATUS_UNDEFINED; 3398 } 3399} 3400EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3401 3402/* 3403 * To avoid cluttering sysfs (and memory) with useless state, only 3404 * create attributes that can be meaningfully displayed. 3405 */ 3406static int add_regulator_attributes(struct regulator_dev *rdev) 3407{ 3408 struct device *dev = &rdev->dev; 3409 struct regulator_ops *ops = rdev->desc->ops; 3410 int status = 0; 3411 3412 /* some attributes need specific methods to be displayed */ 3413 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3414 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3415 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3416 status = device_create_file(dev, &dev_attr_microvolts); 3417 if (status < 0) 3418 return status; 3419 } 3420 if (ops->get_current_limit) { 3421 status = device_create_file(dev, &dev_attr_microamps); 3422 if (status < 0) 3423 return status; 3424 } 3425 if (ops->get_mode) { 3426 status = device_create_file(dev, &dev_attr_opmode); 3427 if (status < 0) 3428 return status; 3429 } 3430 if (rdev->ena_pin || ops->is_enabled) { 3431 status = device_create_file(dev, &dev_attr_state); 3432 if (status < 0) 3433 return status; 3434 } 3435 if (ops->get_status) { 3436 status = device_create_file(dev, &dev_attr_status); 3437 if (status < 0) 3438 return status; 3439 } 3440 if (ops->get_bypass) { 3441 status = device_create_file(dev, &dev_attr_bypass); 3442 if (status < 0) 3443 return status; 3444 } 3445 3446 /* some attributes are type-specific */ 3447 if (rdev->desc->type == REGULATOR_CURRENT) { 3448 status = device_create_file(dev, &dev_attr_requested_microamps); 3449 if (status < 0) 3450 return status; 3451 } 3452 3453 /* all the other attributes exist to support constraints; 3454 * don't show them if there are no constraints, or if the 3455 * relevant supporting methods are missing. 3456 */ 3457 if (!rdev->constraints) 3458 return status; 3459 3460 /* constraints need specific supporting methods */ 3461 if (ops->set_voltage || ops->set_voltage_sel) { 3462 status = device_create_file(dev, &dev_attr_min_microvolts); 3463 if (status < 0) 3464 return status; 3465 status = device_create_file(dev, &dev_attr_max_microvolts); 3466 if (status < 0) 3467 return status; 3468 } 3469 if (ops->set_current_limit) { 3470 status = device_create_file(dev, &dev_attr_min_microamps); 3471 if (status < 0) 3472 return status; 3473 status = device_create_file(dev, &dev_attr_max_microamps); 3474 if (status < 0) 3475 return status; 3476 } 3477 3478 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3479 if (status < 0) 3480 return status; 3481 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3482 if (status < 0) 3483 return status; 3484 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3485 if (status < 0) 3486 return status; 3487 3488 if (ops->set_suspend_voltage) { 3489 status = device_create_file(dev, 3490 &dev_attr_suspend_standby_microvolts); 3491 if (status < 0) 3492 return status; 3493 status = device_create_file(dev, 3494 &dev_attr_suspend_mem_microvolts); 3495 if (status < 0) 3496 return status; 3497 status = device_create_file(dev, 3498 &dev_attr_suspend_disk_microvolts); 3499 if (status < 0) 3500 return status; 3501 } 3502 3503 if (ops->set_suspend_mode) { 3504 status = device_create_file(dev, 3505 &dev_attr_suspend_standby_mode); 3506 if (status < 0) 3507 return status; 3508 status = device_create_file(dev, 3509 &dev_attr_suspend_mem_mode); 3510 if (status < 0) 3511 return status; 3512 status = device_create_file(dev, 3513 &dev_attr_suspend_disk_mode); 3514 if (status < 0) 3515 return status; 3516 } 3517 3518 return status; 3519} 3520 3521static void rdev_init_debugfs(struct regulator_dev *rdev) 3522{ 3523 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3524 if (!rdev->debugfs) { 3525 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3526 return; 3527 } 3528 3529 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3530 &rdev->use_count); 3531 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3532 &rdev->open_count); 3533 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3534 &rdev->bypass_count); 3535} 3536 3537/** 3538 * regulator_register - register regulator 3539 * @regulator_desc: regulator to register 3540 * @config: runtime configuration for regulator 3541 * 3542 * Called by regulator drivers to register a regulator. 3543 * Returns a valid pointer to struct regulator_dev on success 3544 * or an ERR_PTR() on error. 3545 */ 3546struct regulator_dev * 3547regulator_register(const struct regulator_desc *regulator_desc, 3548 const struct regulator_config *config) 3549{ 3550 const struct regulation_constraints *constraints = NULL; 3551 const struct regulator_init_data *init_data; 3552 static atomic_t regulator_no = ATOMIC_INIT(0); 3553 struct regulator_dev *rdev; 3554 struct device *dev; 3555 int ret, i; 3556 const char *supply = NULL; 3557 3558 if (regulator_desc == NULL || config == NULL) 3559 return ERR_PTR(-EINVAL); 3560 3561 dev = config->dev; 3562 WARN_ON(!dev); 3563 3564 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3565 return ERR_PTR(-EINVAL); 3566 3567 if (regulator_desc->type != REGULATOR_VOLTAGE && 3568 regulator_desc->type != REGULATOR_CURRENT) 3569 return ERR_PTR(-EINVAL); 3570 3571 /* Only one of each should be implemented */ 3572 WARN_ON(regulator_desc->ops->get_voltage && 3573 regulator_desc->ops->get_voltage_sel); 3574 WARN_ON(regulator_desc->ops->set_voltage && 3575 regulator_desc->ops->set_voltage_sel); 3576 3577 /* If we're using selectors we must implement list_voltage. */ 3578 if (regulator_desc->ops->get_voltage_sel && 3579 !regulator_desc->ops->list_voltage) { 3580 return ERR_PTR(-EINVAL); 3581 } 3582 if (regulator_desc->ops->set_voltage_sel && 3583 !regulator_desc->ops->list_voltage) { 3584 return ERR_PTR(-EINVAL); 3585 } 3586 3587 init_data = config->init_data; 3588 3589 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3590 if (rdev == NULL) 3591 return ERR_PTR(-ENOMEM); 3592 3593 mutex_lock(®ulator_list_mutex); 3594 3595 mutex_init(&rdev->mutex); 3596 rdev->reg_data = config->driver_data; 3597 rdev->owner = regulator_desc->owner; 3598 rdev->desc = regulator_desc; 3599 if (config->regmap) 3600 rdev->regmap = config->regmap; 3601 else if (dev_get_regmap(dev, NULL)) 3602 rdev->regmap = dev_get_regmap(dev, NULL); 3603 else if (dev->parent) 3604 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3605 INIT_LIST_HEAD(&rdev->consumer_list); 3606 INIT_LIST_HEAD(&rdev->list); 3607 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3608 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3609 3610 /* preform any regulator specific init */ 3611 if (init_data && init_data->regulator_init) { 3612 ret = init_data->regulator_init(rdev->reg_data); 3613 if (ret < 0) 3614 goto clean; 3615 } 3616 3617 /* register with sysfs */ 3618 rdev->dev.class = ®ulator_class; 3619 rdev->dev.of_node = config->of_node; 3620 rdev->dev.parent = dev; 3621 dev_set_name(&rdev->dev, "regulator.%d", 3622 atomic_inc_return(®ulator_no) - 1); 3623 ret = device_register(&rdev->dev); 3624 if (ret != 0) { 3625 put_device(&rdev->dev); 3626 goto clean; 3627 } 3628 3629 dev_set_drvdata(&rdev->dev, rdev); 3630 3631 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3632 ret = regulator_ena_gpio_request(rdev, config); 3633 if (ret != 0) { 3634 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3635 config->ena_gpio, ret); 3636 goto wash; 3637 } 3638 3639 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3640 rdev->ena_gpio_state = 1; 3641 3642 if (config->ena_gpio_invert) 3643 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3644 } 3645 3646 /* set regulator constraints */ 3647 if (init_data) 3648 constraints = &init_data->constraints; 3649 3650 ret = set_machine_constraints(rdev, constraints); 3651 if (ret < 0) 3652 goto scrub; 3653 3654 /* add attributes supported by this regulator */ 3655 ret = add_regulator_attributes(rdev); 3656 if (ret < 0) 3657 goto scrub; 3658 3659 if (init_data && init_data->supply_regulator) 3660 supply = init_data->supply_regulator; 3661 else if (regulator_desc->supply_name) 3662 supply = regulator_desc->supply_name; 3663 3664 if (supply) { 3665 struct regulator_dev *r; 3666 3667 r = regulator_dev_lookup(dev, supply, &ret); 3668 3669 if (ret == -ENODEV) { 3670 /* 3671 * No supply was specified for this regulator and 3672 * there will never be one. 3673 */ 3674 ret = 0; 3675 goto add_dev; 3676 } else if (!r) { 3677 dev_err(dev, "Failed to find supply %s\n", supply); 3678 ret = -EPROBE_DEFER; 3679 goto scrub; 3680 } 3681 3682 ret = set_supply(rdev, r); 3683 if (ret < 0) 3684 goto scrub; 3685 3686 /* Enable supply if rail is enabled */ 3687 if (_regulator_is_enabled(rdev)) { 3688 ret = regulator_enable(rdev->supply); 3689 if (ret < 0) 3690 goto scrub; 3691 } 3692 } 3693 3694add_dev: 3695 /* add consumers devices */ 3696 if (init_data) { 3697 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3698 ret = set_consumer_device_supply(rdev, 3699 init_data->consumer_supplies[i].dev_name, 3700 init_data->consumer_supplies[i].supply); 3701 if (ret < 0) { 3702 dev_err(dev, "Failed to set supply %s\n", 3703 init_data->consumer_supplies[i].supply); 3704 goto unset_supplies; 3705 } 3706 } 3707 } 3708 3709 list_add(&rdev->list, ®ulator_list); 3710 3711 rdev_init_debugfs(rdev); 3712out: 3713 mutex_unlock(®ulator_list_mutex); 3714 return rdev; 3715 3716unset_supplies: 3717 unset_regulator_supplies(rdev); 3718 3719scrub: 3720 if (rdev->supply) 3721 _regulator_put(rdev->supply); 3722 regulator_ena_gpio_free(rdev); 3723 kfree(rdev->constraints); 3724wash: 3725 device_unregister(&rdev->dev); 3726 /* device core frees rdev */ 3727 rdev = ERR_PTR(ret); 3728 goto out; 3729 3730clean: 3731 kfree(rdev); 3732 rdev = ERR_PTR(ret); 3733 goto out; 3734} 3735EXPORT_SYMBOL_GPL(regulator_register); 3736 3737/** 3738 * regulator_unregister - unregister regulator 3739 * @rdev: regulator to unregister 3740 * 3741 * Called by regulator drivers to unregister a regulator. 3742 */ 3743void regulator_unregister(struct regulator_dev *rdev) 3744{ 3745 if (rdev == NULL) 3746 return; 3747 3748 if (rdev->supply) { 3749 while (rdev->use_count--) 3750 regulator_disable(rdev->supply); 3751 regulator_put(rdev->supply); 3752 } 3753 mutex_lock(®ulator_list_mutex); 3754 debugfs_remove_recursive(rdev->debugfs); 3755 flush_work(&rdev->disable_work.work); 3756 WARN_ON(rdev->open_count); 3757 unset_regulator_supplies(rdev); 3758 list_del(&rdev->list); 3759 kfree(rdev->constraints); 3760 regulator_ena_gpio_free(rdev); 3761 device_unregister(&rdev->dev); 3762 mutex_unlock(®ulator_list_mutex); 3763} 3764EXPORT_SYMBOL_GPL(regulator_unregister); 3765 3766/** 3767 * regulator_suspend_prepare - prepare regulators for system wide suspend 3768 * @state: system suspend state 3769 * 3770 * Configure each regulator with it's suspend operating parameters for state. 3771 * This will usually be called by machine suspend code prior to supending. 3772 */ 3773int regulator_suspend_prepare(suspend_state_t state) 3774{ 3775 struct regulator_dev *rdev; 3776 int ret = 0; 3777 3778 /* ON is handled by regulator active state */ 3779 if (state == PM_SUSPEND_ON) 3780 return -EINVAL; 3781 3782 mutex_lock(®ulator_list_mutex); 3783 list_for_each_entry(rdev, ®ulator_list, list) { 3784 3785 mutex_lock(&rdev->mutex); 3786 ret = suspend_prepare(rdev, state); 3787 mutex_unlock(&rdev->mutex); 3788 3789 if (ret < 0) { 3790 rdev_err(rdev, "failed to prepare\n"); 3791 goto out; 3792 } 3793 } 3794out: 3795 mutex_unlock(®ulator_list_mutex); 3796 return ret; 3797} 3798EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3799 3800/** 3801 * regulator_suspend_finish - resume regulators from system wide suspend 3802 * 3803 * Turn on regulators that might be turned off by regulator_suspend_prepare 3804 * and that should be turned on according to the regulators properties. 3805 */ 3806int regulator_suspend_finish(void) 3807{ 3808 struct regulator_dev *rdev; 3809 int ret = 0, error; 3810 3811 mutex_lock(®ulator_list_mutex); 3812 list_for_each_entry(rdev, ®ulator_list, list) { 3813 struct regulator_ops *ops = rdev->desc->ops; 3814 3815 mutex_lock(&rdev->mutex); 3816 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3817 ops->enable) { 3818 error = ops->enable(rdev); 3819 if (error) 3820 ret = error; 3821 } else { 3822 if (!has_full_constraints) 3823 goto unlock; 3824 if (!ops->disable) 3825 goto unlock; 3826 if (!_regulator_is_enabled(rdev)) 3827 goto unlock; 3828 3829 error = ops->disable(rdev); 3830 if (error) 3831 ret = error; 3832 } 3833unlock: 3834 mutex_unlock(&rdev->mutex); 3835 } 3836 mutex_unlock(®ulator_list_mutex); 3837 return ret; 3838} 3839EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3840 3841/** 3842 * regulator_has_full_constraints - the system has fully specified constraints 3843 * 3844 * Calling this function will cause the regulator API to disable all 3845 * regulators which have a zero use count and don't have an always_on 3846 * constraint in a late_initcall. 3847 * 3848 * The intention is that this will become the default behaviour in a 3849 * future kernel release so users are encouraged to use this facility 3850 * now. 3851 */ 3852void regulator_has_full_constraints(void) 3853{ 3854 has_full_constraints = 1; 3855} 3856EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3857 3858/** 3859 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3860 * 3861 * Calling this function will cause the regulator API to provide a 3862 * dummy regulator to consumers if no physical regulator is found, 3863 * allowing most consumers to proceed as though a regulator were 3864 * configured. This allows systems such as those with software 3865 * controllable regulators for the CPU core only to be brought up more 3866 * readily. 3867 */ 3868void regulator_use_dummy_regulator(void) 3869{ 3870 board_wants_dummy_regulator = true; 3871} 3872EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3873 3874/** 3875 * rdev_get_drvdata - get rdev regulator driver data 3876 * @rdev: regulator 3877 * 3878 * Get rdev regulator driver private data. This call can be used in the 3879 * regulator driver context. 3880 */ 3881void *rdev_get_drvdata(struct regulator_dev *rdev) 3882{ 3883 return rdev->reg_data; 3884} 3885EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3886 3887/** 3888 * regulator_get_drvdata - get regulator driver data 3889 * @regulator: regulator 3890 * 3891 * Get regulator driver private data. This call can be used in the consumer 3892 * driver context when non API regulator specific functions need to be called. 3893 */ 3894void *regulator_get_drvdata(struct regulator *regulator) 3895{ 3896 return regulator->rdev->reg_data; 3897} 3898EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3899 3900/** 3901 * regulator_set_drvdata - set regulator driver data 3902 * @regulator: regulator 3903 * @data: data 3904 */ 3905void regulator_set_drvdata(struct regulator *regulator, void *data) 3906{ 3907 regulator->rdev->reg_data = data; 3908} 3909EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3910 3911/** 3912 * regulator_get_id - get regulator ID 3913 * @rdev: regulator 3914 */ 3915int rdev_get_id(struct regulator_dev *rdev) 3916{ 3917 return rdev->desc->id; 3918} 3919EXPORT_SYMBOL_GPL(rdev_get_id); 3920 3921struct device *rdev_get_dev(struct regulator_dev *rdev) 3922{ 3923 return &rdev->dev; 3924} 3925EXPORT_SYMBOL_GPL(rdev_get_dev); 3926 3927void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3928{ 3929 return reg_init_data->driver_data; 3930} 3931EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3932 3933#ifdef CONFIG_DEBUG_FS 3934static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3935 size_t count, loff_t *ppos) 3936{ 3937 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3938 ssize_t len, ret = 0; 3939 struct regulator_map *map; 3940 3941 if (!buf) 3942 return -ENOMEM; 3943 3944 list_for_each_entry(map, ®ulator_map_list, list) { 3945 len = snprintf(buf + ret, PAGE_SIZE - ret, 3946 "%s -> %s.%s\n", 3947 rdev_get_name(map->regulator), map->dev_name, 3948 map->supply); 3949 if (len >= 0) 3950 ret += len; 3951 if (ret > PAGE_SIZE) { 3952 ret = PAGE_SIZE; 3953 break; 3954 } 3955 } 3956 3957 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3958 3959 kfree(buf); 3960 3961 return ret; 3962} 3963#endif 3964 3965static const struct file_operations supply_map_fops = { 3966#ifdef CONFIG_DEBUG_FS 3967 .read = supply_map_read_file, 3968 .llseek = default_llseek, 3969#endif 3970}; 3971 3972static int __init regulator_init(void) 3973{ 3974 int ret; 3975 3976 ret = class_register(®ulator_class); 3977 3978 debugfs_root = debugfs_create_dir("regulator", NULL); 3979 if (!debugfs_root) 3980 pr_warn("regulator: Failed to create debugfs directory\n"); 3981 3982 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3983 &supply_map_fops); 3984 3985 regulator_dummy_init(); 3986 3987 return ret; 3988} 3989 3990/* init early to allow our consumers to complete system booting */ 3991core_initcall(regulator_init); 3992 3993static int __init regulator_init_complete(void) 3994{ 3995 struct regulator_dev *rdev; 3996 struct regulator_ops *ops; 3997 struct regulation_constraints *c; 3998 int enabled, ret; 3999 4000 /* 4001 * Since DT doesn't provide an idiomatic mechanism for 4002 * enabling full constraints and since it's much more natural 4003 * with DT to provide them just assume that a DT enabled 4004 * system has full constraints. 4005 */ 4006 if (of_have_populated_dt()) 4007 has_full_constraints = true; 4008 4009 mutex_lock(®ulator_list_mutex); 4010 4011 /* If we have a full configuration then disable any regulators 4012 * which are not in use or always_on. This will become the 4013 * default behaviour in the future. 4014 */ 4015 list_for_each_entry(rdev, ®ulator_list, list) { 4016 ops = rdev->desc->ops; 4017 c = rdev->constraints; 4018 4019 if (!ops->disable || (c && c->always_on)) 4020 continue; 4021 4022 mutex_lock(&rdev->mutex); 4023 4024 if (rdev->use_count) 4025 goto unlock; 4026 4027 /* If we can't read the status assume it's on. */ 4028 if (ops->is_enabled) 4029 enabled = ops->is_enabled(rdev); 4030 else 4031 enabled = 1; 4032 4033 if (!enabled) 4034 goto unlock; 4035 4036 if (has_full_constraints) { 4037 /* We log since this may kill the system if it 4038 * goes wrong. */ 4039 rdev_info(rdev, "disabling\n"); 4040 ret = ops->disable(rdev); 4041 if (ret != 0) { 4042 rdev_err(rdev, "couldn't disable: %d\n", ret); 4043 } 4044 } else { 4045 /* The intention is that in future we will 4046 * assume that full constraints are provided 4047 * so warn even if we aren't going to do 4048 * anything here. 4049 */ 4050 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 4051 } 4052 4053unlock: 4054 mutex_unlock(&rdev->mutex); 4055 } 4056 4057 mutex_unlock(®ulator_list_mutex); 4058 4059 return 0; 4060} 4061late_initcall(regulator_init_complete); 4062