core.c revision 4040394e12cb1eed21d1306cacdc8a6f0464c8e2
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; 56 57static struct dentry *debugfs_root; 58 59/* 60 * struct regulator_map 61 * 62 * Used to provide symbolic supply names to devices. 63 */ 64struct regulator_map { 65 struct list_head list; 66 const char *dev_name; /* The dev_name() for the consumer */ 67 const char *supply; 68 struct regulator_dev *regulator; 69}; 70 71/* 72 * struct regulator_enable_gpio 73 * 74 * Management for shared enable GPIO pin 75 */ 76struct regulator_enable_gpio { 77 struct list_head list; 78 int gpio; 79 u32 enable_count; /* a number of enabled shared GPIO */ 80 u32 request_count; /* a number of requested shared GPIO */ 81 unsigned int ena_gpio_invert:1; 82}; 83 84/* 85 * struct regulator 86 * 87 * One for each consumer device. 88 */ 89struct regulator { 90 struct device *dev; 91 struct list_head list; 92 unsigned int always_on:1; 93 unsigned int bypass:1; 94 int uA_load; 95 int min_uV; 96 int max_uV; 97 char *supply_name; 98 struct device_attribute dev_attr; 99 struct regulator_dev *rdev; 100 struct dentry *debugfs; 101}; 102 103static int _regulator_is_enabled(struct regulator_dev *rdev); 104static int _regulator_disable(struct regulator_dev *rdev); 105static int _regulator_get_voltage(struct regulator_dev *rdev); 106static int _regulator_get_current_limit(struct regulator_dev *rdev); 107static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 108static void _notifier_call_chain(struct regulator_dev *rdev, 109 unsigned long event, void *data); 110static int _regulator_do_set_voltage(struct regulator_dev *rdev, 111 int min_uV, int max_uV); 112static struct regulator *create_regulator(struct regulator_dev *rdev, 113 struct device *dev, 114 const char *supply_name); 115 116static const char *rdev_get_name(struct regulator_dev *rdev) 117{ 118 if (rdev->constraints && rdev->constraints->name) 119 return rdev->constraints->name; 120 else if (rdev->desc->name) 121 return rdev->desc->name; 122 else 123 return ""; 124} 125 126/** 127 * of_get_regulator - get a regulator device node based on supply name 128 * @dev: Device pointer for the consumer (of regulator) device 129 * @supply: regulator supply name 130 * 131 * Extract the regulator device node corresponding to the supply name. 132 * returns the device node corresponding to the regulator if found, else 133 * returns NULL. 134 */ 135static struct device_node *of_get_regulator(struct device *dev, const char *supply) 136{ 137 struct device_node *regnode = NULL; 138 char prop_name[32]; /* 32 is max size of property name */ 139 140 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 141 142 snprintf(prop_name, 32, "%s-supply", supply); 143 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 144 145 if (!regnode) { 146 dev_dbg(dev, "Looking up %s property in node %s failed", 147 prop_name, dev->of_node->full_name); 148 return NULL; 149 } 150 return regnode; 151} 152 153static int _regulator_can_change_status(struct regulator_dev *rdev) 154{ 155 if (!rdev->constraints) 156 return 0; 157 158 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 159 return 1; 160 else 161 return 0; 162} 163 164/* Platform voltage constraint check */ 165static int regulator_check_voltage(struct regulator_dev *rdev, 166 int *min_uV, int *max_uV) 167{ 168 BUG_ON(*min_uV > *max_uV); 169 170 if (!rdev->constraints) { 171 rdev_err(rdev, "no constraints\n"); 172 return -ENODEV; 173 } 174 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 175 rdev_err(rdev, "operation not allowed\n"); 176 return -EPERM; 177 } 178 179 if (*max_uV > rdev->constraints->max_uV) 180 *max_uV = rdev->constraints->max_uV; 181 if (*min_uV < rdev->constraints->min_uV) 182 *min_uV = rdev->constraints->min_uV; 183 184 if (*min_uV > *max_uV) { 185 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 186 *min_uV, *max_uV); 187 return -EINVAL; 188 } 189 190 return 0; 191} 192 193/* Make sure we select a voltage that suits the needs of all 194 * regulator consumers 195 */ 196static int regulator_check_consumers(struct regulator_dev *rdev, 197 int *min_uV, int *max_uV) 198{ 199 struct regulator *regulator; 200 201 list_for_each_entry(regulator, &rdev->consumer_list, list) { 202 /* 203 * Assume consumers that didn't say anything are OK 204 * with anything in the constraint range. 205 */ 206 if (!regulator->min_uV && !regulator->max_uV) 207 continue; 208 209 if (*max_uV > regulator->max_uV) 210 *max_uV = regulator->max_uV; 211 if (*min_uV < regulator->min_uV) 212 *min_uV = regulator->min_uV; 213 } 214 215 if (*min_uV > *max_uV) { 216 rdev_err(rdev, "Restricting voltage, %u-%uuV\n", 217 *min_uV, *max_uV); 218 return -EINVAL; 219 } 220 221 return 0; 222} 223 224/* current constraint check */ 225static int regulator_check_current_limit(struct regulator_dev *rdev, 226 int *min_uA, int *max_uA) 227{ 228 BUG_ON(*min_uA > *max_uA); 229 230 if (!rdev->constraints) { 231 rdev_err(rdev, "no constraints\n"); 232 return -ENODEV; 233 } 234 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 235 rdev_err(rdev, "operation not allowed\n"); 236 return -EPERM; 237 } 238 239 if (*max_uA > rdev->constraints->max_uA) 240 *max_uA = rdev->constraints->max_uA; 241 if (*min_uA < rdev->constraints->min_uA) 242 *min_uA = rdev->constraints->min_uA; 243 244 if (*min_uA > *max_uA) { 245 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 246 *min_uA, *max_uA); 247 return -EINVAL; 248 } 249 250 return 0; 251} 252 253/* operating mode constraint check */ 254static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 255{ 256 switch (*mode) { 257 case REGULATOR_MODE_FAST: 258 case REGULATOR_MODE_NORMAL: 259 case REGULATOR_MODE_IDLE: 260 case REGULATOR_MODE_STANDBY: 261 break; 262 default: 263 rdev_err(rdev, "invalid mode %x specified\n", *mode); 264 return -EINVAL; 265 } 266 267 if (!rdev->constraints) { 268 rdev_err(rdev, "no constraints\n"); 269 return -ENODEV; 270 } 271 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 272 rdev_err(rdev, "operation not allowed\n"); 273 return -EPERM; 274 } 275 276 /* The modes are bitmasks, the most power hungry modes having 277 * the lowest values. If the requested mode isn't supported 278 * try higher modes. */ 279 while (*mode) { 280 if (rdev->constraints->valid_modes_mask & *mode) 281 return 0; 282 *mode /= 2; 283 } 284 285 return -EINVAL; 286} 287 288/* dynamic regulator mode switching constraint check */ 289static int regulator_check_drms(struct regulator_dev *rdev) 290{ 291 if (!rdev->constraints) { 292 rdev_err(rdev, "no constraints\n"); 293 return -ENODEV; 294 } 295 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 296 rdev_err(rdev, "operation not allowed\n"); 297 return -EPERM; 298 } 299 return 0; 300} 301 302static ssize_t regulator_uV_show(struct device *dev, 303 struct device_attribute *attr, char *buf) 304{ 305 struct regulator_dev *rdev = dev_get_drvdata(dev); 306 ssize_t ret; 307 308 mutex_lock(&rdev->mutex); 309 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 310 mutex_unlock(&rdev->mutex); 311 312 return ret; 313} 314static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 315 316static ssize_t regulator_uA_show(struct device *dev, 317 struct device_attribute *attr, char *buf) 318{ 319 struct regulator_dev *rdev = dev_get_drvdata(dev); 320 321 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 322} 323static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 324 325static ssize_t name_show(struct device *dev, struct device_attribute *attr, 326 char *buf) 327{ 328 struct regulator_dev *rdev = dev_get_drvdata(dev); 329 330 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 331} 332static DEVICE_ATTR_RO(name); 333 334static ssize_t regulator_print_opmode(char *buf, int mode) 335{ 336 switch (mode) { 337 case REGULATOR_MODE_FAST: 338 return sprintf(buf, "fast\n"); 339 case REGULATOR_MODE_NORMAL: 340 return sprintf(buf, "normal\n"); 341 case REGULATOR_MODE_IDLE: 342 return sprintf(buf, "idle\n"); 343 case REGULATOR_MODE_STANDBY: 344 return sprintf(buf, "standby\n"); 345 } 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_opmode_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 354 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 355} 356static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 357 358static ssize_t regulator_print_state(char *buf, int state) 359{ 360 if (state > 0) 361 return sprintf(buf, "enabled\n"); 362 else if (state == 0) 363 return sprintf(buf, "disabled\n"); 364 else 365 return sprintf(buf, "unknown\n"); 366} 367 368static ssize_t regulator_state_show(struct device *dev, 369 struct device_attribute *attr, char *buf) 370{ 371 struct regulator_dev *rdev = dev_get_drvdata(dev); 372 ssize_t ret; 373 374 mutex_lock(&rdev->mutex); 375 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 376 mutex_unlock(&rdev->mutex); 377 378 return ret; 379} 380static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 381 382static ssize_t regulator_status_show(struct device *dev, 383 struct device_attribute *attr, char *buf) 384{ 385 struct regulator_dev *rdev = dev_get_drvdata(dev); 386 int status; 387 char *label; 388 389 status = rdev->desc->ops->get_status(rdev); 390 if (status < 0) 391 return status; 392 393 switch (status) { 394 case REGULATOR_STATUS_OFF: 395 label = "off"; 396 break; 397 case REGULATOR_STATUS_ON: 398 label = "on"; 399 break; 400 case REGULATOR_STATUS_ERROR: 401 label = "error"; 402 break; 403 case REGULATOR_STATUS_FAST: 404 label = "fast"; 405 break; 406 case REGULATOR_STATUS_NORMAL: 407 label = "normal"; 408 break; 409 case REGULATOR_STATUS_IDLE: 410 label = "idle"; 411 break; 412 case REGULATOR_STATUS_STANDBY: 413 label = "standby"; 414 break; 415 case REGULATOR_STATUS_BYPASS: 416 label = "bypass"; 417 break; 418 case REGULATOR_STATUS_UNDEFINED: 419 label = "undefined"; 420 break; 421 default: 422 return -ERANGE; 423 } 424 425 return sprintf(buf, "%s\n", label); 426} 427static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 428 429static ssize_t regulator_min_uA_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431{ 432 struct regulator_dev *rdev = dev_get_drvdata(dev); 433 434 if (!rdev->constraints) 435 return sprintf(buf, "constraint not defined\n"); 436 437 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 438} 439static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 440 441static ssize_t regulator_max_uA_show(struct device *dev, 442 struct device_attribute *attr, char *buf) 443{ 444 struct regulator_dev *rdev = dev_get_drvdata(dev); 445 446 if (!rdev->constraints) 447 return sprintf(buf, "constraint not defined\n"); 448 449 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 450} 451static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 452 453static ssize_t regulator_min_uV_show(struct device *dev, 454 struct device_attribute *attr, char *buf) 455{ 456 struct regulator_dev *rdev = dev_get_drvdata(dev); 457 458 if (!rdev->constraints) 459 return sprintf(buf, "constraint not defined\n"); 460 461 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 462} 463static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 464 465static ssize_t regulator_max_uV_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467{ 468 struct regulator_dev *rdev = dev_get_drvdata(dev); 469 470 if (!rdev->constraints) 471 return sprintf(buf, "constraint not defined\n"); 472 473 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 474} 475static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 476 477static ssize_t regulator_total_uA_show(struct device *dev, 478 struct device_attribute *attr, char *buf) 479{ 480 struct regulator_dev *rdev = dev_get_drvdata(dev); 481 struct regulator *regulator; 482 int uA = 0; 483 484 mutex_lock(&rdev->mutex); 485 list_for_each_entry(regulator, &rdev->consumer_list, list) 486 uA += regulator->uA_load; 487 mutex_unlock(&rdev->mutex); 488 return sprintf(buf, "%d\n", uA); 489} 490static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 491 492static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, 493 char *buf) 494{ 495 struct regulator_dev *rdev = dev_get_drvdata(dev); 496 return sprintf(buf, "%d\n", rdev->use_count); 497} 498static DEVICE_ATTR_RO(num_users); 499 500static ssize_t type_show(struct device *dev, struct device_attribute *attr, 501 char *buf) 502{ 503 struct regulator_dev *rdev = dev_get_drvdata(dev); 504 505 switch (rdev->desc->type) { 506 case REGULATOR_VOLTAGE: 507 return sprintf(buf, "voltage\n"); 508 case REGULATOR_CURRENT: 509 return sprintf(buf, "current\n"); 510 } 511 return sprintf(buf, "unknown\n"); 512} 513static DEVICE_ATTR_RO(type); 514 515static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 516 struct device_attribute *attr, char *buf) 517{ 518 struct regulator_dev *rdev = dev_get_drvdata(dev); 519 520 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 521} 522static DEVICE_ATTR(suspend_mem_microvolts, 0444, 523 regulator_suspend_mem_uV_show, NULL); 524 525static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 526 struct device_attribute *attr, char *buf) 527{ 528 struct regulator_dev *rdev = dev_get_drvdata(dev); 529 530 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 531} 532static DEVICE_ATTR(suspend_disk_microvolts, 0444, 533 regulator_suspend_disk_uV_show, NULL); 534 535static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 536 struct device_attribute *attr, char *buf) 537{ 538 struct regulator_dev *rdev = dev_get_drvdata(dev); 539 540 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 541} 542static DEVICE_ATTR(suspend_standby_microvolts, 0444, 543 regulator_suspend_standby_uV_show, NULL); 544 545static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 546 struct device_attribute *attr, char *buf) 547{ 548 struct regulator_dev *rdev = dev_get_drvdata(dev); 549 550 return regulator_print_opmode(buf, 551 rdev->constraints->state_mem.mode); 552} 553static DEVICE_ATTR(suspend_mem_mode, 0444, 554 regulator_suspend_mem_mode_show, NULL); 555 556static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 557 struct device_attribute *attr, char *buf) 558{ 559 struct regulator_dev *rdev = dev_get_drvdata(dev); 560 561 return regulator_print_opmode(buf, 562 rdev->constraints->state_disk.mode); 563} 564static DEVICE_ATTR(suspend_disk_mode, 0444, 565 regulator_suspend_disk_mode_show, NULL); 566 567static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 568 struct device_attribute *attr, char *buf) 569{ 570 struct regulator_dev *rdev = dev_get_drvdata(dev); 571 572 return regulator_print_opmode(buf, 573 rdev->constraints->state_standby.mode); 574} 575static DEVICE_ATTR(suspend_standby_mode, 0444, 576 regulator_suspend_standby_mode_show, NULL); 577 578static ssize_t regulator_suspend_mem_state_show(struct device *dev, 579 struct device_attribute *attr, char *buf) 580{ 581 struct regulator_dev *rdev = dev_get_drvdata(dev); 582 583 return regulator_print_state(buf, 584 rdev->constraints->state_mem.enabled); 585} 586static DEVICE_ATTR(suspend_mem_state, 0444, 587 regulator_suspend_mem_state_show, NULL); 588 589static ssize_t regulator_suspend_disk_state_show(struct device *dev, 590 struct device_attribute *attr, char *buf) 591{ 592 struct regulator_dev *rdev = dev_get_drvdata(dev); 593 594 return regulator_print_state(buf, 595 rdev->constraints->state_disk.enabled); 596} 597static DEVICE_ATTR(suspend_disk_state, 0444, 598 regulator_suspend_disk_state_show, NULL); 599 600static ssize_t regulator_suspend_standby_state_show(struct device *dev, 601 struct device_attribute *attr, char *buf) 602{ 603 struct regulator_dev *rdev = dev_get_drvdata(dev); 604 605 return regulator_print_state(buf, 606 rdev->constraints->state_standby.enabled); 607} 608static DEVICE_ATTR(suspend_standby_state, 0444, 609 regulator_suspend_standby_state_show, NULL); 610 611static ssize_t regulator_bypass_show(struct device *dev, 612 struct device_attribute *attr, char *buf) 613{ 614 struct regulator_dev *rdev = dev_get_drvdata(dev); 615 const char *report; 616 bool bypass; 617 int ret; 618 619 ret = rdev->desc->ops->get_bypass(rdev, &bypass); 620 621 if (ret != 0) 622 report = "unknown"; 623 else if (bypass) 624 report = "enabled"; 625 else 626 report = "disabled"; 627 628 return sprintf(buf, "%s\n", report); 629} 630static DEVICE_ATTR(bypass, 0444, 631 regulator_bypass_show, NULL); 632 633/* 634 * These are the only attributes are present for all regulators. 635 * Other attributes are a function of regulator functionality. 636 */ 637static struct attribute *regulator_dev_attrs[] = { 638 &dev_attr_name.attr, 639 &dev_attr_num_users.attr, 640 &dev_attr_type.attr, 641 NULL, 642}; 643ATTRIBUTE_GROUPS(regulator_dev); 644 645static void regulator_dev_release(struct device *dev) 646{ 647 struct regulator_dev *rdev = dev_get_drvdata(dev); 648 kfree(rdev); 649} 650 651static struct class regulator_class = { 652 .name = "regulator", 653 .dev_release = regulator_dev_release, 654 .dev_groups = regulator_dev_groups, 655}; 656 657/* Calculate the new optimum regulator operating mode based on the new total 658 * consumer load. All locks held by caller */ 659static void drms_uA_update(struct regulator_dev *rdev) 660{ 661 struct regulator *sibling; 662 int current_uA = 0, output_uV, input_uV, err; 663 unsigned int mode; 664 665 err = regulator_check_drms(rdev); 666 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 667 (!rdev->desc->ops->get_voltage && 668 !rdev->desc->ops->get_voltage_sel) || 669 !rdev->desc->ops->set_mode) 670 return; 671 672 /* get output voltage */ 673 output_uV = _regulator_get_voltage(rdev); 674 if (output_uV <= 0) 675 return; 676 677 /* get input voltage */ 678 input_uV = 0; 679 if (rdev->supply) 680 input_uV = regulator_get_voltage(rdev->supply); 681 if (input_uV <= 0) 682 input_uV = rdev->constraints->input_uV; 683 if (input_uV <= 0) 684 return; 685 686 /* calc total requested load */ 687 list_for_each_entry(sibling, &rdev->consumer_list, list) 688 current_uA += sibling->uA_load; 689 690 /* now get the optimum mode for our new total regulator load */ 691 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 692 output_uV, current_uA); 693 694 /* check the new mode is allowed */ 695 err = regulator_mode_constrain(rdev, &mode); 696 if (err == 0) 697 rdev->desc->ops->set_mode(rdev, mode); 698} 699 700static int suspend_set_state(struct regulator_dev *rdev, 701 struct regulator_state *rstate) 702{ 703 int ret = 0; 704 705 /* If we have no suspend mode configration don't set anything; 706 * only warn if the driver implements set_suspend_voltage or 707 * set_suspend_mode callback. 708 */ 709 if (!rstate->enabled && !rstate->disabled) { 710 if (rdev->desc->ops->set_suspend_voltage || 711 rdev->desc->ops->set_suspend_mode) 712 rdev_warn(rdev, "No configuration\n"); 713 return 0; 714 } 715 716 if (rstate->enabled && rstate->disabled) { 717 rdev_err(rdev, "invalid configuration\n"); 718 return -EINVAL; 719 } 720 721 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 722 ret = rdev->desc->ops->set_suspend_enable(rdev); 723 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 724 ret = rdev->desc->ops->set_suspend_disable(rdev); 725 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 726 ret = 0; 727 728 if (ret < 0) { 729 rdev_err(rdev, "failed to enabled/disable\n"); 730 return ret; 731 } 732 733 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 734 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 735 if (ret < 0) { 736 rdev_err(rdev, "failed to set voltage\n"); 737 return ret; 738 } 739 } 740 741 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 742 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 743 if (ret < 0) { 744 rdev_err(rdev, "failed to set mode\n"); 745 return ret; 746 } 747 } 748 return ret; 749} 750 751/* locks held by caller */ 752static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 753{ 754 if (!rdev->constraints) 755 return -EINVAL; 756 757 switch (state) { 758 case PM_SUSPEND_STANDBY: 759 return suspend_set_state(rdev, 760 &rdev->constraints->state_standby); 761 case PM_SUSPEND_MEM: 762 return suspend_set_state(rdev, 763 &rdev->constraints->state_mem); 764 case PM_SUSPEND_MAX: 765 return suspend_set_state(rdev, 766 &rdev->constraints->state_disk); 767 default: 768 return -EINVAL; 769 } 770} 771 772static void print_constraints(struct regulator_dev *rdev) 773{ 774 struct regulation_constraints *constraints = rdev->constraints; 775 char buf[80] = ""; 776 int count = 0; 777 int ret; 778 779 if (constraints->min_uV && constraints->max_uV) { 780 if (constraints->min_uV == constraints->max_uV) 781 count += sprintf(buf + count, "%d mV ", 782 constraints->min_uV / 1000); 783 else 784 count += sprintf(buf + count, "%d <--> %d mV ", 785 constraints->min_uV / 1000, 786 constraints->max_uV / 1000); 787 } 788 789 if (!constraints->min_uV || 790 constraints->min_uV != constraints->max_uV) { 791 ret = _regulator_get_voltage(rdev); 792 if (ret > 0) 793 count += sprintf(buf + count, "at %d mV ", ret / 1000); 794 } 795 796 if (constraints->uV_offset) 797 count += sprintf(buf, "%dmV offset ", 798 constraints->uV_offset / 1000); 799 800 if (constraints->min_uA && constraints->max_uA) { 801 if (constraints->min_uA == constraints->max_uA) 802 count += sprintf(buf + count, "%d mA ", 803 constraints->min_uA / 1000); 804 else 805 count += sprintf(buf + count, "%d <--> %d mA ", 806 constraints->min_uA / 1000, 807 constraints->max_uA / 1000); 808 } 809 810 if (!constraints->min_uA || 811 constraints->min_uA != constraints->max_uA) { 812 ret = _regulator_get_current_limit(rdev); 813 if (ret > 0) 814 count += sprintf(buf + count, "at %d mA ", ret / 1000); 815 } 816 817 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 818 count += sprintf(buf + count, "fast "); 819 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 820 count += sprintf(buf + count, "normal "); 821 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 822 count += sprintf(buf + count, "idle "); 823 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 824 count += sprintf(buf + count, "standby"); 825 826 if (!count) 827 sprintf(buf, "no parameters"); 828 829 rdev_info(rdev, "%s\n", buf); 830 831 if ((constraints->min_uV != constraints->max_uV) && 832 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 833 rdev_warn(rdev, 834 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 835} 836 837static int machine_constraints_voltage(struct regulator_dev *rdev, 838 struct regulation_constraints *constraints) 839{ 840 struct regulator_ops *ops = rdev->desc->ops; 841 int ret; 842 843 /* do we need to apply the constraint voltage */ 844 if (rdev->constraints->apply_uV && 845 rdev->constraints->min_uV == rdev->constraints->max_uV) { 846 ret = _regulator_do_set_voltage(rdev, 847 rdev->constraints->min_uV, 848 rdev->constraints->max_uV); 849 if (ret < 0) { 850 rdev_err(rdev, "failed to apply %duV constraint\n", 851 rdev->constraints->min_uV); 852 return ret; 853 } 854 } 855 856 /* constrain machine-level voltage specs to fit 857 * the actual range supported by this regulator. 858 */ 859 if (ops->list_voltage && rdev->desc->n_voltages) { 860 int count = rdev->desc->n_voltages; 861 int i; 862 int min_uV = INT_MAX; 863 int max_uV = INT_MIN; 864 int cmin = constraints->min_uV; 865 int cmax = constraints->max_uV; 866 867 /* it's safe to autoconfigure fixed-voltage supplies 868 and the constraints are used by list_voltage. */ 869 if (count == 1 && !cmin) { 870 cmin = 1; 871 cmax = INT_MAX; 872 constraints->min_uV = cmin; 873 constraints->max_uV = cmax; 874 } 875 876 /* voltage constraints are optional */ 877 if ((cmin == 0) && (cmax == 0)) 878 return 0; 879 880 /* else require explicit machine-level constraints */ 881 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 882 rdev_err(rdev, "invalid voltage constraints\n"); 883 return -EINVAL; 884 } 885 886 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 887 for (i = 0; i < count; i++) { 888 int value; 889 890 value = ops->list_voltage(rdev, i); 891 if (value <= 0) 892 continue; 893 894 /* maybe adjust [min_uV..max_uV] */ 895 if (value >= cmin && value < min_uV) 896 min_uV = value; 897 if (value <= cmax && value > max_uV) 898 max_uV = value; 899 } 900 901 /* final: [min_uV..max_uV] valid iff constraints valid */ 902 if (max_uV < min_uV) { 903 rdev_err(rdev, 904 "unsupportable voltage constraints %u-%uuV\n", 905 min_uV, max_uV); 906 return -EINVAL; 907 } 908 909 /* use regulator's subset of machine constraints */ 910 if (constraints->min_uV < min_uV) { 911 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 912 constraints->min_uV, min_uV); 913 constraints->min_uV = min_uV; 914 } 915 if (constraints->max_uV > max_uV) { 916 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 917 constraints->max_uV, max_uV); 918 constraints->max_uV = max_uV; 919 } 920 } 921 922 return 0; 923} 924 925/** 926 * set_machine_constraints - sets regulator constraints 927 * @rdev: regulator source 928 * @constraints: constraints to apply 929 * 930 * Allows platform initialisation code to define and constrain 931 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 932 * Constraints *must* be set by platform code in order for some 933 * regulator operations to proceed i.e. set_voltage, set_current_limit, 934 * set_mode. 935 */ 936static int set_machine_constraints(struct regulator_dev *rdev, 937 const struct regulation_constraints *constraints) 938{ 939 int ret = 0; 940 struct regulator_ops *ops = rdev->desc->ops; 941 942 if (constraints) 943 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 944 GFP_KERNEL); 945 else 946 rdev->constraints = kzalloc(sizeof(*constraints), 947 GFP_KERNEL); 948 if (!rdev->constraints) 949 return -ENOMEM; 950 951 ret = machine_constraints_voltage(rdev, rdev->constraints); 952 if (ret != 0) 953 goto out; 954 955 /* do we need to setup our suspend state */ 956 if (rdev->constraints->initial_state) { 957 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 958 if (ret < 0) { 959 rdev_err(rdev, "failed to set suspend state\n"); 960 goto out; 961 } 962 } 963 964 if (rdev->constraints->initial_mode) { 965 if (!ops->set_mode) { 966 rdev_err(rdev, "no set_mode operation\n"); 967 ret = -EINVAL; 968 goto out; 969 } 970 971 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 972 if (ret < 0) { 973 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 974 goto out; 975 } 976 } 977 978 /* If the constraints say the regulator should be on at this point 979 * and we have control then make sure it is enabled. 980 */ 981 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 982 ops->enable) { 983 ret = ops->enable(rdev); 984 if (ret < 0) { 985 rdev_err(rdev, "failed to enable\n"); 986 goto out; 987 } 988 } 989 990 if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) 991 && 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 bool exclusive, bool allow_dummy) 1246{ 1247 struct regulator_dev *rdev; 1248 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1249 const char *devname = NULL; 1250 int ret = -EPROBE_DEFER; 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 regulator = ERR_PTR(ret); 1267 1268 /* 1269 * If we have return value from dev_lookup fail, we do not expect to 1270 * succeed, so, quit with appropriate error value 1271 */ 1272 if (ret && ret != -ENODEV) { 1273 goto out; 1274 } 1275 1276 if (!devname) 1277 devname = "deviceless"; 1278 1279 /* 1280 * Assume that a regulator is physically present and enabled 1281 * even if it isn't hooked up and just provide a dummy. 1282 */ 1283 if (has_full_constraints && allow_dummy) { 1284 pr_warn("%s supply %s not found, using dummy regulator\n", 1285 devname, id); 1286 1287 rdev = dummy_regulator_rdev; 1288 goto found; 1289 } else { 1290 dev_err(dev, "dummy supplies not allowed\n"); 1291 } 1292 1293 mutex_unlock(®ulator_list_mutex); 1294 return regulator; 1295 1296found: 1297 if (rdev->exclusive) { 1298 regulator = ERR_PTR(-EPERM); 1299 goto out; 1300 } 1301 1302 if (exclusive && rdev->open_count) { 1303 regulator = ERR_PTR(-EBUSY); 1304 goto out; 1305 } 1306 1307 if (!try_module_get(rdev->owner)) 1308 goto out; 1309 1310 regulator = create_regulator(rdev, dev, id); 1311 if (regulator == NULL) { 1312 regulator = ERR_PTR(-ENOMEM); 1313 module_put(rdev->owner); 1314 goto out; 1315 } 1316 1317 rdev->open_count++; 1318 if (exclusive) { 1319 rdev->exclusive = 1; 1320 1321 ret = _regulator_is_enabled(rdev); 1322 if (ret > 0) 1323 rdev->use_count = 1; 1324 else 1325 rdev->use_count = 0; 1326 } 1327 1328out: 1329 mutex_unlock(®ulator_list_mutex); 1330 1331 return regulator; 1332} 1333 1334/** 1335 * regulator_get - lookup and obtain a reference to a regulator. 1336 * @dev: device for regulator "consumer" 1337 * @id: Supply name or regulator ID. 1338 * 1339 * Returns a struct regulator corresponding to the regulator producer, 1340 * or IS_ERR() condition containing errno. 1341 * 1342 * Use of supply names configured via regulator_set_device_supply() is 1343 * strongly encouraged. It is recommended that the supply name used 1344 * should match the name used for the supply and/or the relevant 1345 * device pins in the datasheet. 1346 */ 1347struct regulator *regulator_get(struct device *dev, const char *id) 1348{ 1349 return _regulator_get(dev, id, false, true); 1350} 1351EXPORT_SYMBOL_GPL(regulator_get); 1352 1353static void devm_regulator_release(struct device *dev, void *res) 1354{ 1355 regulator_put(*(struct regulator **)res); 1356} 1357 1358/** 1359 * devm_regulator_get - Resource managed regulator_get() 1360 * @dev: device for regulator "consumer" 1361 * @id: Supply name or regulator ID. 1362 * 1363 * Managed regulator_get(). Regulators returned from this function are 1364 * automatically regulator_put() on driver detach. See regulator_get() for more 1365 * information. 1366 */ 1367struct regulator *devm_regulator_get(struct device *dev, const char *id) 1368{ 1369 struct regulator **ptr, *regulator; 1370 1371 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1372 if (!ptr) 1373 return ERR_PTR(-ENOMEM); 1374 1375 regulator = regulator_get(dev, id); 1376 if (!IS_ERR(regulator)) { 1377 *ptr = regulator; 1378 devres_add(dev, ptr); 1379 } else { 1380 devres_free(ptr); 1381 } 1382 1383 return regulator; 1384} 1385EXPORT_SYMBOL_GPL(devm_regulator_get); 1386 1387/** 1388 * regulator_get_exclusive - obtain exclusive access to a regulator. 1389 * @dev: device for regulator "consumer" 1390 * @id: Supply name or regulator ID. 1391 * 1392 * Returns a struct regulator corresponding to the regulator producer, 1393 * or IS_ERR() condition containing errno. Other consumers will be 1394 * unable to obtain this reference is held and the use count for the 1395 * regulator will be initialised to reflect the current state of the 1396 * regulator. 1397 * 1398 * This is intended for use by consumers which cannot tolerate shared 1399 * use of the regulator such as those which need to force the 1400 * regulator off for correct operation of the hardware they are 1401 * controlling. 1402 * 1403 * Use of supply names configured via regulator_set_device_supply() is 1404 * strongly encouraged. It is recommended that the supply name used 1405 * should match the name used for the supply and/or the relevant 1406 * device pins in the datasheet. 1407 */ 1408struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1409{ 1410 return _regulator_get(dev, id, true, false); 1411} 1412EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1413 1414/** 1415 * regulator_get_optional - obtain optional access to a regulator. 1416 * @dev: device for regulator "consumer" 1417 * @id: Supply name or regulator ID. 1418 * 1419 * Returns a struct regulator corresponding to the regulator producer, 1420 * or IS_ERR() condition containing errno. Other consumers will be 1421 * unable to obtain this reference is held and the use count for the 1422 * regulator will be initialised to reflect the current state of the 1423 * regulator. 1424 * 1425 * This is intended for use by consumers for devices which can have 1426 * some supplies unconnected in normal use, such as some MMC devices. 1427 * It can allow the regulator core to provide stub supplies for other 1428 * supplies requested using normal regulator_get() calls without 1429 * disrupting the operation of drivers that can handle absent 1430 * supplies. 1431 * 1432 * Use of supply names configured via regulator_set_device_supply() is 1433 * strongly encouraged. It is recommended that the supply name used 1434 * should match the name used for the supply and/or the relevant 1435 * device pins in the datasheet. 1436 */ 1437struct regulator *regulator_get_optional(struct device *dev, const char *id) 1438{ 1439 return _regulator_get(dev, id, false, false); 1440} 1441EXPORT_SYMBOL_GPL(regulator_get_optional); 1442 1443/** 1444 * devm_regulator_get_optional - Resource managed regulator_get_optional() 1445 * @dev: device for regulator "consumer" 1446 * @id: Supply name or regulator ID. 1447 * 1448 * Managed regulator_get_optional(). Regulators returned from this 1449 * function are automatically regulator_put() on driver detach. See 1450 * regulator_get_optional() for more information. 1451 */ 1452struct regulator *devm_regulator_get_optional(struct device *dev, 1453 const char *id) 1454{ 1455 struct regulator **ptr, *regulator; 1456 1457 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1458 if (!ptr) 1459 return ERR_PTR(-ENOMEM); 1460 1461 regulator = regulator_get_optional(dev, id); 1462 if (!IS_ERR(regulator)) { 1463 *ptr = regulator; 1464 devres_add(dev, ptr); 1465 } else { 1466 devres_free(ptr); 1467 } 1468 1469 return regulator; 1470} 1471EXPORT_SYMBOL_GPL(devm_regulator_get_optional); 1472 1473/* Locks held by regulator_put() */ 1474static void _regulator_put(struct regulator *regulator) 1475{ 1476 struct regulator_dev *rdev; 1477 1478 if (regulator == NULL || IS_ERR(regulator)) 1479 return; 1480 1481 rdev = regulator->rdev; 1482 1483 debugfs_remove_recursive(regulator->debugfs); 1484 1485 /* remove any sysfs entries */ 1486 if (regulator->dev) 1487 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1488 kfree(regulator->supply_name); 1489 list_del(®ulator->list); 1490 kfree(regulator); 1491 1492 rdev->open_count--; 1493 rdev->exclusive = 0; 1494 1495 module_put(rdev->owner); 1496} 1497 1498/** 1499 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive() 1500 * @dev: device for regulator "consumer" 1501 * @id: Supply name or regulator ID. 1502 * 1503 * Managed regulator_get_exclusive(). Regulators returned from this function 1504 * are automatically regulator_put() on driver detach. See regulator_get() for 1505 * more information. 1506 */ 1507struct regulator *devm_regulator_get_exclusive(struct device *dev, 1508 const char *id) 1509{ 1510 struct regulator **ptr, *regulator; 1511 1512 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1513 if (!ptr) 1514 return ERR_PTR(-ENOMEM); 1515 1516 regulator = _regulator_get(dev, id, 1); 1517 if (!IS_ERR(regulator)) { 1518 *ptr = regulator; 1519 devres_add(dev, ptr); 1520 } else { 1521 devres_free(ptr); 1522 } 1523 1524 return regulator; 1525} 1526EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive); 1527 1528/** 1529 * regulator_put - "free" the regulator source 1530 * @regulator: regulator source 1531 * 1532 * Note: drivers must ensure that all regulator_enable calls made on this 1533 * regulator source are balanced by regulator_disable calls prior to calling 1534 * this function. 1535 */ 1536void regulator_put(struct regulator *regulator) 1537{ 1538 mutex_lock(®ulator_list_mutex); 1539 _regulator_put(regulator); 1540 mutex_unlock(®ulator_list_mutex); 1541} 1542EXPORT_SYMBOL_GPL(regulator_put); 1543 1544static int devm_regulator_match(struct device *dev, void *res, void *data) 1545{ 1546 struct regulator **r = res; 1547 if (!r || !*r) { 1548 WARN_ON(!r || !*r); 1549 return 0; 1550 } 1551 return *r == data; 1552} 1553 1554/** 1555 * devm_regulator_put - Resource managed regulator_put() 1556 * @regulator: regulator to free 1557 * 1558 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1559 * this function will not need to be called and the resource management 1560 * code will ensure that the resource is freed. 1561 */ 1562void devm_regulator_put(struct regulator *regulator) 1563{ 1564 int rc; 1565 1566 rc = devres_release(regulator->dev, devm_regulator_release, 1567 devm_regulator_match, regulator); 1568 if (rc != 0) 1569 WARN_ON(rc); 1570} 1571EXPORT_SYMBOL_GPL(devm_regulator_put); 1572 1573/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1574static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1575 const struct regulator_config *config) 1576{ 1577 struct regulator_enable_gpio *pin; 1578 int ret; 1579 1580 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1581 if (pin->gpio == config->ena_gpio) { 1582 rdev_dbg(rdev, "GPIO %d is already used\n", 1583 config->ena_gpio); 1584 goto update_ena_gpio_to_rdev; 1585 } 1586 } 1587 1588 ret = gpio_request_one(config->ena_gpio, 1589 GPIOF_DIR_OUT | config->ena_gpio_flags, 1590 rdev_get_name(rdev)); 1591 if (ret) 1592 return ret; 1593 1594 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1595 if (pin == NULL) { 1596 gpio_free(config->ena_gpio); 1597 return -ENOMEM; 1598 } 1599 1600 pin->gpio = config->ena_gpio; 1601 pin->ena_gpio_invert = config->ena_gpio_invert; 1602 list_add(&pin->list, ®ulator_ena_gpio_list); 1603 1604update_ena_gpio_to_rdev: 1605 pin->request_count++; 1606 rdev->ena_pin = pin; 1607 return 0; 1608} 1609 1610static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1611{ 1612 struct regulator_enable_gpio *pin, *n; 1613 1614 if (!rdev->ena_pin) 1615 return; 1616 1617 /* Free the GPIO only in case of no use */ 1618 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1619 if (pin->gpio == rdev->ena_pin->gpio) { 1620 if (pin->request_count <= 1) { 1621 pin->request_count = 0; 1622 gpio_free(pin->gpio); 1623 list_del(&pin->list); 1624 kfree(pin); 1625 } else { 1626 pin->request_count--; 1627 } 1628 } 1629 } 1630} 1631 1632/** 1633 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1634 * @rdev: regulator_dev structure 1635 * @enable: enable GPIO at initial use? 1636 * 1637 * GPIO is enabled in case of initial use. (enable_count is 0) 1638 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1639 */ 1640static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1641{ 1642 struct regulator_enable_gpio *pin = rdev->ena_pin; 1643 1644 if (!pin) 1645 return -EINVAL; 1646 1647 if (enable) { 1648 /* Enable GPIO at initial use */ 1649 if (pin->enable_count == 0) 1650 gpio_set_value_cansleep(pin->gpio, 1651 !pin->ena_gpio_invert); 1652 1653 pin->enable_count++; 1654 } else { 1655 if (pin->enable_count > 1) { 1656 pin->enable_count--; 1657 return 0; 1658 } 1659 1660 /* Disable GPIO if not used */ 1661 if (pin->enable_count <= 1) { 1662 gpio_set_value_cansleep(pin->gpio, 1663 pin->ena_gpio_invert); 1664 pin->enable_count = 0; 1665 } 1666 } 1667 1668 return 0; 1669} 1670 1671static int _regulator_do_enable(struct regulator_dev *rdev) 1672{ 1673 int ret, delay; 1674 1675 /* Query before enabling in case configuration dependent. */ 1676 ret = _regulator_get_enable_time(rdev); 1677 if (ret >= 0) { 1678 delay = ret; 1679 } else { 1680 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1681 delay = 0; 1682 } 1683 1684 trace_regulator_enable(rdev_get_name(rdev)); 1685 1686 if (rdev->ena_pin) { 1687 ret = regulator_ena_gpio_ctrl(rdev, true); 1688 if (ret < 0) 1689 return ret; 1690 rdev->ena_gpio_state = 1; 1691 } else if (rdev->desc->ops->enable) { 1692 ret = rdev->desc->ops->enable(rdev); 1693 if (ret < 0) 1694 return ret; 1695 } else { 1696 return -EINVAL; 1697 } 1698 1699 /* Allow the regulator to ramp; it would be useful to extend 1700 * this for bulk operations so that the regulators can ramp 1701 * together. */ 1702 trace_regulator_enable_delay(rdev_get_name(rdev)); 1703 1704 if (delay >= 1000) { 1705 mdelay(delay / 1000); 1706 udelay(delay % 1000); 1707 } else if (delay) { 1708 udelay(delay); 1709 } 1710 1711 trace_regulator_enable_complete(rdev_get_name(rdev)); 1712 1713 return 0; 1714} 1715 1716/* locks held by regulator_enable() */ 1717static int _regulator_enable(struct regulator_dev *rdev) 1718{ 1719 int ret; 1720 1721 /* check voltage and requested load before enabling */ 1722 if (rdev->constraints && 1723 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1724 drms_uA_update(rdev); 1725 1726 if (rdev->use_count == 0) { 1727 /* The regulator may on if it's not switchable or left on */ 1728 ret = _regulator_is_enabled(rdev); 1729 if (ret == -EINVAL || ret == 0) { 1730 if (!_regulator_can_change_status(rdev)) 1731 return -EPERM; 1732 1733 ret = _regulator_do_enable(rdev); 1734 if (ret < 0) 1735 return ret; 1736 1737 } else if (ret < 0) { 1738 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1739 return ret; 1740 } 1741 /* Fallthrough on positive return values - already enabled */ 1742 } 1743 1744 rdev->use_count++; 1745 1746 return 0; 1747} 1748 1749/** 1750 * regulator_enable - enable regulator output 1751 * @regulator: regulator source 1752 * 1753 * Request that the regulator be enabled with the regulator output at 1754 * the predefined voltage or current value. Calls to regulator_enable() 1755 * must be balanced with calls to regulator_disable(). 1756 * 1757 * NOTE: the output value can be set by other drivers, boot loader or may be 1758 * hardwired in the regulator. 1759 */ 1760int regulator_enable(struct regulator *regulator) 1761{ 1762 struct regulator_dev *rdev = regulator->rdev; 1763 int ret = 0; 1764 1765 if (regulator->always_on) 1766 return 0; 1767 1768 if (rdev->supply) { 1769 ret = regulator_enable(rdev->supply); 1770 if (ret != 0) 1771 return ret; 1772 } 1773 1774 mutex_lock(&rdev->mutex); 1775 ret = _regulator_enable(rdev); 1776 mutex_unlock(&rdev->mutex); 1777 1778 if (ret != 0 && rdev->supply) 1779 regulator_disable(rdev->supply); 1780 1781 return ret; 1782} 1783EXPORT_SYMBOL_GPL(regulator_enable); 1784 1785static int _regulator_do_disable(struct regulator_dev *rdev) 1786{ 1787 int ret; 1788 1789 trace_regulator_disable(rdev_get_name(rdev)); 1790 1791 if (rdev->ena_pin) { 1792 ret = regulator_ena_gpio_ctrl(rdev, false); 1793 if (ret < 0) 1794 return ret; 1795 rdev->ena_gpio_state = 0; 1796 1797 } else if (rdev->desc->ops->disable) { 1798 ret = rdev->desc->ops->disable(rdev); 1799 if (ret != 0) 1800 return ret; 1801 } 1802 1803 trace_regulator_disable_complete(rdev_get_name(rdev)); 1804 1805 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1806 NULL); 1807 return 0; 1808} 1809 1810/* locks held by regulator_disable() */ 1811static int _regulator_disable(struct regulator_dev *rdev) 1812{ 1813 int ret = 0; 1814 1815 if (WARN(rdev->use_count <= 0, 1816 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1817 return -EIO; 1818 1819 /* are we the last user and permitted to disable ? */ 1820 if (rdev->use_count == 1 && 1821 (rdev->constraints && !rdev->constraints->always_on)) { 1822 1823 /* we are last user */ 1824 if (_regulator_can_change_status(rdev)) { 1825 ret = _regulator_do_disable(rdev); 1826 if (ret < 0) { 1827 rdev_err(rdev, "failed to disable\n"); 1828 return ret; 1829 } 1830 } 1831 1832 rdev->use_count = 0; 1833 } else if (rdev->use_count > 1) { 1834 1835 if (rdev->constraints && 1836 (rdev->constraints->valid_ops_mask & 1837 REGULATOR_CHANGE_DRMS)) 1838 drms_uA_update(rdev); 1839 1840 rdev->use_count--; 1841 } 1842 1843 return ret; 1844} 1845 1846/** 1847 * regulator_disable - disable regulator output 1848 * @regulator: regulator source 1849 * 1850 * Disable the regulator output voltage or current. Calls to 1851 * regulator_enable() must be balanced with calls to 1852 * regulator_disable(). 1853 * 1854 * NOTE: this will only disable the regulator output if no other consumer 1855 * devices have it enabled, the regulator device supports disabling and 1856 * machine constraints permit this operation. 1857 */ 1858int regulator_disable(struct regulator *regulator) 1859{ 1860 struct regulator_dev *rdev = regulator->rdev; 1861 int ret = 0; 1862 1863 if (regulator->always_on) 1864 return 0; 1865 1866 mutex_lock(&rdev->mutex); 1867 ret = _regulator_disable(rdev); 1868 mutex_unlock(&rdev->mutex); 1869 1870 if (ret == 0 && rdev->supply) 1871 regulator_disable(rdev->supply); 1872 1873 return ret; 1874} 1875EXPORT_SYMBOL_GPL(regulator_disable); 1876 1877/* locks held by regulator_force_disable() */ 1878static int _regulator_force_disable(struct regulator_dev *rdev) 1879{ 1880 int ret = 0; 1881 1882 /* force disable */ 1883 if (rdev->desc->ops->disable) { 1884 /* ah well, who wants to live forever... */ 1885 ret = rdev->desc->ops->disable(rdev); 1886 if (ret < 0) { 1887 rdev_err(rdev, "failed to force disable\n"); 1888 return ret; 1889 } 1890 /* notify other consumers that power has been forced off */ 1891 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1892 REGULATOR_EVENT_DISABLE, NULL); 1893 } 1894 1895 return ret; 1896} 1897 1898/** 1899 * regulator_force_disable - force disable regulator output 1900 * @regulator: regulator source 1901 * 1902 * Forcibly disable the regulator output voltage or current. 1903 * NOTE: this *will* disable the regulator output even if other consumer 1904 * devices have it enabled. This should be used for situations when device 1905 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1906 */ 1907int regulator_force_disable(struct regulator *regulator) 1908{ 1909 struct regulator_dev *rdev = regulator->rdev; 1910 int ret; 1911 1912 mutex_lock(&rdev->mutex); 1913 regulator->uA_load = 0; 1914 ret = _regulator_force_disable(regulator->rdev); 1915 mutex_unlock(&rdev->mutex); 1916 1917 if (rdev->supply) 1918 while (rdev->open_count--) 1919 regulator_disable(rdev->supply); 1920 1921 return ret; 1922} 1923EXPORT_SYMBOL_GPL(regulator_force_disable); 1924 1925static void regulator_disable_work(struct work_struct *work) 1926{ 1927 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1928 disable_work.work); 1929 int count, i, ret; 1930 1931 mutex_lock(&rdev->mutex); 1932 1933 BUG_ON(!rdev->deferred_disables); 1934 1935 count = rdev->deferred_disables; 1936 rdev->deferred_disables = 0; 1937 1938 for (i = 0; i < count; i++) { 1939 ret = _regulator_disable(rdev); 1940 if (ret != 0) 1941 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1942 } 1943 1944 mutex_unlock(&rdev->mutex); 1945 1946 if (rdev->supply) { 1947 for (i = 0; i < count; i++) { 1948 ret = regulator_disable(rdev->supply); 1949 if (ret != 0) { 1950 rdev_err(rdev, 1951 "Supply disable failed: %d\n", ret); 1952 } 1953 } 1954 } 1955} 1956 1957/** 1958 * regulator_disable_deferred - disable regulator output with delay 1959 * @regulator: regulator source 1960 * @ms: miliseconds until the regulator is disabled 1961 * 1962 * Execute regulator_disable() on the regulator after a delay. This 1963 * is intended for use with devices that require some time to quiesce. 1964 * 1965 * NOTE: this will only disable the regulator output if no other consumer 1966 * devices have it enabled, the regulator device supports disabling and 1967 * machine constraints permit this operation. 1968 */ 1969int regulator_disable_deferred(struct regulator *regulator, int ms) 1970{ 1971 struct regulator_dev *rdev = regulator->rdev; 1972 int ret; 1973 1974 if (regulator->always_on) 1975 return 0; 1976 1977 if (!ms) 1978 return regulator_disable(regulator); 1979 1980 mutex_lock(&rdev->mutex); 1981 rdev->deferred_disables++; 1982 mutex_unlock(&rdev->mutex); 1983 1984 ret = queue_delayed_work(system_power_efficient_wq, 1985 &rdev->disable_work, 1986 msecs_to_jiffies(ms)); 1987 if (ret < 0) 1988 return ret; 1989 else 1990 return 0; 1991} 1992EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1993 1994static int _regulator_is_enabled(struct regulator_dev *rdev) 1995{ 1996 /* A GPIO control always takes precedence */ 1997 if (rdev->ena_pin) 1998 return rdev->ena_gpio_state; 1999 2000 /* If we don't know then assume that the regulator is always on */ 2001 if (!rdev->desc->ops->is_enabled) 2002 return 1; 2003 2004 return rdev->desc->ops->is_enabled(rdev); 2005} 2006 2007/** 2008 * regulator_is_enabled - is the regulator output enabled 2009 * @regulator: regulator source 2010 * 2011 * Returns positive if the regulator driver backing the source/client 2012 * has requested that the device be enabled, zero if it hasn't, else a 2013 * negative errno code. 2014 * 2015 * Note that the device backing this regulator handle can have multiple 2016 * users, so it might be enabled even if regulator_enable() was never 2017 * called for this particular source. 2018 */ 2019int regulator_is_enabled(struct regulator *regulator) 2020{ 2021 int ret; 2022 2023 if (regulator->always_on) 2024 return 1; 2025 2026 mutex_lock(®ulator->rdev->mutex); 2027 ret = _regulator_is_enabled(regulator->rdev); 2028 mutex_unlock(®ulator->rdev->mutex); 2029 2030 return ret; 2031} 2032EXPORT_SYMBOL_GPL(regulator_is_enabled); 2033 2034/** 2035 * regulator_can_change_voltage - check if regulator can change voltage 2036 * @regulator: regulator source 2037 * 2038 * Returns positive if the regulator driver backing the source/client 2039 * can change its voltage, false otherwise. Usefull for detecting fixed 2040 * or dummy regulators and disabling voltage change logic in the client 2041 * driver. 2042 */ 2043int regulator_can_change_voltage(struct regulator *regulator) 2044{ 2045 struct regulator_dev *rdev = regulator->rdev; 2046 2047 if (rdev->constraints && 2048 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2049 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2050 return 1; 2051 2052 if (rdev->desc->continuous_voltage_range && 2053 rdev->constraints->min_uV && rdev->constraints->max_uV && 2054 rdev->constraints->min_uV != rdev->constraints->max_uV) 2055 return 1; 2056 } 2057 2058 return 0; 2059} 2060EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2061 2062/** 2063 * regulator_count_voltages - count regulator_list_voltage() selectors 2064 * @regulator: regulator source 2065 * 2066 * Returns number of selectors, or negative errno. Selectors are 2067 * numbered starting at zero, and typically correspond to bitfields 2068 * in hardware registers. 2069 */ 2070int regulator_count_voltages(struct regulator *regulator) 2071{ 2072 struct regulator_dev *rdev = regulator->rdev; 2073 2074 return rdev->desc->n_voltages ? : -EINVAL; 2075} 2076EXPORT_SYMBOL_GPL(regulator_count_voltages); 2077 2078/** 2079 * regulator_list_voltage - enumerate supported voltages 2080 * @regulator: regulator source 2081 * @selector: identify voltage to list 2082 * Context: can sleep 2083 * 2084 * Returns a voltage that can be passed to @regulator_set_voltage(), 2085 * zero if this selector code can't be used on this system, or a 2086 * negative errno. 2087 */ 2088int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2089{ 2090 struct regulator_dev *rdev = regulator->rdev; 2091 struct regulator_ops *ops = rdev->desc->ops; 2092 int ret; 2093 2094 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2095 return -EINVAL; 2096 2097 mutex_lock(&rdev->mutex); 2098 ret = ops->list_voltage(rdev, selector); 2099 mutex_unlock(&rdev->mutex); 2100 2101 if (ret > 0) { 2102 if (ret < rdev->constraints->min_uV) 2103 ret = 0; 2104 else if (ret > rdev->constraints->max_uV) 2105 ret = 0; 2106 } 2107 2108 return ret; 2109} 2110EXPORT_SYMBOL_GPL(regulator_list_voltage); 2111 2112/** 2113 * regulator_get_linear_step - return the voltage step size between VSEL values 2114 * @regulator: regulator source 2115 * 2116 * Returns the voltage step size between VSEL values for linear 2117 * regulators, or return 0 if the regulator isn't a linear regulator. 2118 */ 2119unsigned int regulator_get_linear_step(struct regulator *regulator) 2120{ 2121 struct regulator_dev *rdev = regulator->rdev; 2122 2123 return rdev->desc->uV_step; 2124} 2125EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2126 2127/** 2128 * regulator_is_supported_voltage - check if a voltage range can be supported 2129 * 2130 * @regulator: Regulator to check. 2131 * @min_uV: Minimum required voltage in uV. 2132 * @max_uV: Maximum required voltage in uV. 2133 * 2134 * Returns a boolean or a negative error code. 2135 */ 2136int regulator_is_supported_voltage(struct regulator *regulator, 2137 int min_uV, int max_uV) 2138{ 2139 struct regulator_dev *rdev = regulator->rdev; 2140 int i, voltages, ret; 2141 2142 /* If we can't change voltage check the current voltage */ 2143 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2144 ret = regulator_get_voltage(regulator); 2145 if (ret >= 0) 2146 return (min_uV <= ret && ret <= max_uV); 2147 else 2148 return ret; 2149 } 2150 2151 /* Any voltage within constrains range is fine? */ 2152 if (rdev->desc->continuous_voltage_range) 2153 return min_uV >= rdev->constraints->min_uV && 2154 max_uV <= rdev->constraints->max_uV; 2155 2156 ret = regulator_count_voltages(regulator); 2157 if (ret < 0) 2158 return ret; 2159 voltages = ret; 2160 2161 for (i = 0; i < voltages; i++) { 2162 ret = regulator_list_voltage(regulator, i); 2163 2164 if (ret >= min_uV && ret <= max_uV) 2165 return 1; 2166 } 2167 2168 return 0; 2169} 2170EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2171 2172static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2173 int min_uV, int max_uV) 2174{ 2175 int ret; 2176 int delay = 0; 2177 int best_val = 0; 2178 unsigned int selector; 2179 int old_selector = -1; 2180 2181 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2182 2183 min_uV += rdev->constraints->uV_offset; 2184 max_uV += rdev->constraints->uV_offset; 2185 2186 /* 2187 * If we can't obtain the old selector there is not enough 2188 * info to call set_voltage_time_sel(). 2189 */ 2190 if (_regulator_is_enabled(rdev) && 2191 rdev->desc->ops->set_voltage_time_sel && 2192 rdev->desc->ops->get_voltage_sel) { 2193 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2194 if (old_selector < 0) 2195 return old_selector; 2196 } 2197 2198 if (rdev->desc->ops->set_voltage) { 2199 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2200 &selector); 2201 2202 if (ret >= 0) { 2203 if (rdev->desc->ops->list_voltage) 2204 best_val = rdev->desc->ops->list_voltage(rdev, 2205 selector); 2206 else 2207 best_val = _regulator_get_voltage(rdev); 2208 } 2209 2210 } else if (rdev->desc->ops->set_voltage_sel) { 2211 if (rdev->desc->ops->map_voltage) { 2212 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2213 max_uV); 2214 } else { 2215 if (rdev->desc->ops->list_voltage == 2216 regulator_list_voltage_linear) 2217 ret = regulator_map_voltage_linear(rdev, 2218 min_uV, max_uV); 2219 else 2220 ret = regulator_map_voltage_iterate(rdev, 2221 min_uV, max_uV); 2222 } 2223 2224 if (ret >= 0) { 2225 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2226 if (min_uV <= best_val && max_uV >= best_val) { 2227 selector = ret; 2228 if (old_selector == selector) 2229 ret = 0; 2230 else 2231 ret = rdev->desc->ops->set_voltage_sel( 2232 rdev, ret); 2233 } else { 2234 ret = -EINVAL; 2235 } 2236 } 2237 } else { 2238 ret = -EINVAL; 2239 } 2240 2241 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2242 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2243 && old_selector != selector) { 2244 2245 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2246 old_selector, selector); 2247 if (delay < 0) { 2248 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2249 delay); 2250 delay = 0; 2251 } 2252 2253 /* Insert any necessary delays */ 2254 if (delay >= 1000) { 2255 mdelay(delay / 1000); 2256 udelay(delay % 1000); 2257 } else if (delay) { 2258 udelay(delay); 2259 } 2260 } 2261 2262 if (ret == 0 && best_val >= 0) { 2263 unsigned long data = best_val; 2264 2265 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2266 (void *)data); 2267 } 2268 2269 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2270 2271 return ret; 2272} 2273 2274/** 2275 * regulator_set_voltage - set regulator output voltage 2276 * @regulator: regulator source 2277 * @min_uV: Minimum required voltage in uV 2278 * @max_uV: Maximum acceptable voltage in uV 2279 * 2280 * Sets a voltage regulator to the desired output voltage. This can be set 2281 * during any regulator state. IOW, regulator can be disabled or enabled. 2282 * 2283 * If the regulator is enabled then the voltage will change to the new value 2284 * immediately otherwise if the regulator is disabled the regulator will 2285 * output at the new voltage when enabled. 2286 * 2287 * NOTE: If the regulator is shared between several devices then the lowest 2288 * request voltage that meets the system constraints will be used. 2289 * Regulator system constraints must be set for this regulator before 2290 * calling this function otherwise this call will fail. 2291 */ 2292int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2293{ 2294 struct regulator_dev *rdev = regulator->rdev; 2295 int ret = 0; 2296 int old_min_uV, old_max_uV; 2297 2298 mutex_lock(&rdev->mutex); 2299 2300 /* If we're setting the same range as last time the change 2301 * should be a noop (some cpufreq implementations use the same 2302 * voltage for multiple frequencies, for example). 2303 */ 2304 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2305 goto out; 2306 2307 /* sanity check */ 2308 if (!rdev->desc->ops->set_voltage && 2309 !rdev->desc->ops->set_voltage_sel) { 2310 ret = -EINVAL; 2311 goto out; 2312 } 2313 2314 /* constraints check */ 2315 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2316 if (ret < 0) 2317 goto out; 2318 2319 /* restore original values in case of error */ 2320 old_min_uV = regulator->min_uV; 2321 old_max_uV = regulator->max_uV; 2322 regulator->min_uV = min_uV; 2323 regulator->max_uV = max_uV; 2324 2325 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2326 if (ret < 0) 2327 goto out2; 2328 2329 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2330 if (ret < 0) 2331 goto out2; 2332 2333out: 2334 mutex_unlock(&rdev->mutex); 2335 return ret; 2336out2: 2337 regulator->min_uV = old_min_uV; 2338 regulator->max_uV = old_max_uV; 2339 mutex_unlock(&rdev->mutex); 2340 return ret; 2341} 2342EXPORT_SYMBOL_GPL(regulator_set_voltage); 2343 2344/** 2345 * regulator_set_voltage_time - get raise/fall time 2346 * @regulator: regulator source 2347 * @old_uV: starting voltage in microvolts 2348 * @new_uV: target voltage in microvolts 2349 * 2350 * Provided with the starting and ending voltage, this function attempts to 2351 * calculate the time in microseconds required to rise or fall to this new 2352 * voltage. 2353 */ 2354int regulator_set_voltage_time(struct regulator *regulator, 2355 int old_uV, int new_uV) 2356{ 2357 struct regulator_dev *rdev = regulator->rdev; 2358 struct regulator_ops *ops = rdev->desc->ops; 2359 int old_sel = -1; 2360 int new_sel = -1; 2361 int voltage; 2362 int i; 2363 2364 /* Currently requires operations to do this */ 2365 if (!ops->list_voltage || !ops->set_voltage_time_sel 2366 || !rdev->desc->n_voltages) 2367 return -EINVAL; 2368 2369 for (i = 0; i < rdev->desc->n_voltages; i++) { 2370 /* We only look for exact voltage matches here */ 2371 voltage = regulator_list_voltage(regulator, i); 2372 if (voltage < 0) 2373 return -EINVAL; 2374 if (voltage == 0) 2375 continue; 2376 if (voltage == old_uV) 2377 old_sel = i; 2378 if (voltage == new_uV) 2379 new_sel = i; 2380 } 2381 2382 if (old_sel < 0 || new_sel < 0) 2383 return -EINVAL; 2384 2385 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2386} 2387EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2388 2389/** 2390 * regulator_set_voltage_time_sel - get raise/fall time 2391 * @rdev: regulator source device 2392 * @old_selector: selector for starting voltage 2393 * @new_selector: selector for target voltage 2394 * 2395 * Provided with the starting and target voltage selectors, this function 2396 * returns time in microseconds required to rise or fall to this new voltage 2397 * 2398 * Drivers providing ramp_delay in regulation_constraints can use this as their 2399 * set_voltage_time_sel() operation. 2400 */ 2401int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2402 unsigned int old_selector, 2403 unsigned int new_selector) 2404{ 2405 unsigned int ramp_delay = 0; 2406 int old_volt, new_volt; 2407 2408 if (rdev->constraints->ramp_delay) 2409 ramp_delay = rdev->constraints->ramp_delay; 2410 else if (rdev->desc->ramp_delay) 2411 ramp_delay = rdev->desc->ramp_delay; 2412 2413 if (ramp_delay == 0) { 2414 rdev_warn(rdev, "ramp_delay not set\n"); 2415 return 0; 2416 } 2417 2418 /* sanity check */ 2419 if (!rdev->desc->ops->list_voltage) 2420 return -EINVAL; 2421 2422 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2423 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2424 2425 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2426} 2427EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2428 2429/** 2430 * regulator_sync_voltage - re-apply last regulator output voltage 2431 * @regulator: regulator source 2432 * 2433 * Re-apply the last configured voltage. This is intended to be used 2434 * where some external control source the consumer is cooperating with 2435 * has caused the configured voltage to change. 2436 */ 2437int regulator_sync_voltage(struct regulator *regulator) 2438{ 2439 struct regulator_dev *rdev = regulator->rdev; 2440 int ret, min_uV, max_uV; 2441 2442 mutex_lock(&rdev->mutex); 2443 2444 if (!rdev->desc->ops->set_voltage && 2445 !rdev->desc->ops->set_voltage_sel) { 2446 ret = -EINVAL; 2447 goto out; 2448 } 2449 2450 /* This is only going to work if we've had a voltage configured. */ 2451 if (!regulator->min_uV && !regulator->max_uV) { 2452 ret = -EINVAL; 2453 goto out; 2454 } 2455 2456 min_uV = regulator->min_uV; 2457 max_uV = regulator->max_uV; 2458 2459 /* This should be a paranoia check... */ 2460 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2461 if (ret < 0) 2462 goto out; 2463 2464 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2465 if (ret < 0) 2466 goto out; 2467 2468 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2469 2470out: 2471 mutex_unlock(&rdev->mutex); 2472 return ret; 2473} 2474EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2475 2476static int _regulator_get_voltage(struct regulator_dev *rdev) 2477{ 2478 int sel, ret; 2479 2480 if (rdev->desc->ops->get_voltage_sel) { 2481 sel = rdev->desc->ops->get_voltage_sel(rdev); 2482 if (sel < 0) 2483 return sel; 2484 ret = rdev->desc->ops->list_voltage(rdev, sel); 2485 } else if (rdev->desc->ops->get_voltage) { 2486 ret = rdev->desc->ops->get_voltage(rdev); 2487 } else if (rdev->desc->ops->list_voltage) { 2488 ret = rdev->desc->ops->list_voltage(rdev, 0); 2489 } else { 2490 return -EINVAL; 2491 } 2492 2493 if (ret < 0) 2494 return ret; 2495 return ret - rdev->constraints->uV_offset; 2496} 2497 2498/** 2499 * regulator_get_voltage - get regulator output voltage 2500 * @regulator: regulator source 2501 * 2502 * This returns the current regulator voltage in uV. 2503 * 2504 * NOTE: If the regulator is disabled it will return the voltage value. This 2505 * function should not be used to determine regulator state. 2506 */ 2507int regulator_get_voltage(struct regulator *regulator) 2508{ 2509 int ret; 2510 2511 mutex_lock(®ulator->rdev->mutex); 2512 2513 ret = _regulator_get_voltage(regulator->rdev); 2514 2515 mutex_unlock(®ulator->rdev->mutex); 2516 2517 return ret; 2518} 2519EXPORT_SYMBOL_GPL(regulator_get_voltage); 2520 2521/** 2522 * regulator_set_current_limit - set regulator output current limit 2523 * @regulator: regulator source 2524 * @min_uA: Minimum supported current in uA 2525 * @max_uA: Maximum supported current in uA 2526 * 2527 * Sets current sink to the desired output current. This can be set during 2528 * any regulator state. IOW, regulator can be disabled or enabled. 2529 * 2530 * If the regulator is enabled then the current will change to the new value 2531 * immediately otherwise if the regulator is disabled the regulator will 2532 * output at the new current when enabled. 2533 * 2534 * NOTE: Regulator system constraints must be set for this regulator before 2535 * calling this function otherwise this call will fail. 2536 */ 2537int regulator_set_current_limit(struct regulator *regulator, 2538 int min_uA, int max_uA) 2539{ 2540 struct regulator_dev *rdev = regulator->rdev; 2541 int ret; 2542 2543 mutex_lock(&rdev->mutex); 2544 2545 /* sanity check */ 2546 if (!rdev->desc->ops->set_current_limit) { 2547 ret = -EINVAL; 2548 goto out; 2549 } 2550 2551 /* constraints check */ 2552 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2553 if (ret < 0) 2554 goto out; 2555 2556 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2557out: 2558 mutex_unlock(&rdev->mutex); 2559 return ret; 2560} 2561EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2562 2563static int _regulator_get_current_limit(struct regulator_dev *rdev) 2564{ 2565 int ret; 2566 2567 mutex_lock(&rdev->mutex); 2568 2569 /* sanity check */ 2570 if (!rdev->desc->ops->get_current_limit) { 2571 ret = -EINVAL; 2572 goto out; 2573 } 2574 2575 ret = rdev->desc->ops->get_current_limit(rdev); 2576out: 2577 mutex_unlock(&rdev->mutex); 2578 return ret; 2579} 2580 2581/** 2582 * regulator_get_current_limit - get regulator output current 2583 * @regulator: regulator source 2584 * 2585 * This returns the current supplied by the specified current sink in uA. 2586 * 2587 * NOTE: If the regulator is disabled it will return the current value. This 2588 * function should not be used to determine regulator state. 2589 */ 2590int regulator_get_current_limit(struct regulator *regulator) 2591{ 2592 return _regulator_get_current_limit(regulator->rdev); 2593} 2594EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2595 2596/** 2597 * regulator_set_mode - set regulator operating mode 2598 * @regulator: regulator source 2599 * @mode: operating mode - one of the REGULATOR_MODE constants 2600 * 2601 * Set regulator operating mode to increase regulator efficiency or improve 2602 * regulation performance. 2603 * 2604 * NOTE: Regulator system constraints must be set for this regulator before 2605 * calling this function otherwise this call will fail. 2606 */ 2607int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2608{ 2609 struct regulator_dev *rdev = regulator->rdev; 2610 int ret; 2611 int regulator_curr_mode; 2612 2613 mutex_lock(&rdev->mutex); 2614 2615 /* sanity check */ 2616 if (!rdev->desc->ops->set_mode) { 2617 ret = -EINVAL; 2618 goto out; 2619 } 2620 2621 /* return if the same mode is requested */ 2622 if (rdev->desc->ops->get_mode) { 2623 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2624 if (regulator_curr_mode == mode) { 2625 ret = 0; 2626 goto out; 2627 } 2628 } 2629 2630 /* constraints check */ 2631 ret = regulator_mode_constrain(rdev, &mode); 2632 if (ret < 0) 2633 goto out; 2634 2635 ret = rdev->desc->ops->set_mode(rdev, mode); 2636out: 2637 mutex_unlock(&rdev->mutex); 2638 return ret; 2639} 2640EXPORT_SYMBOL_GPL(regulator_set_mode); 2641 2642static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2643{ 2644 int ret; 2645 2646 mutex_lock(&rdev->mutex); 2647 2648 /* sanity check */ 2649 if (!rdev->desc->ops->get_mode) { 2650 ret = -EINVAL; 2651 goto out; 2652 } 2653 2654 ret = rdev->desc->ops->get_mode(rdev); 2655out: 2656 mutex_unlock(&rdev->mutex); 2657 return ret; 2658} 2659 2660/** 2661 * regulator_get_mode - get regulator operating mode 2662 * @regulator: regulator source 2663 * 2664 * Get the current regulator operating mode. 2665 */ 2666unsigned int regulator_get_mode(struct regulator *regulator) 2667{ 2668 return _regulator_get_mode(regulator->rdev); 2669} 2670EXPORT_SYMBOL_GPL(regulator_get_mode); 2671 2672/** 2673 * regulator_set_optimum_mode - set regulator optimum operating mode 2674 * @regulator: regulator source 2675 * @uA_load: load current 2676 * 2677 * Notifies the regulator core of a new device load. This is then used by 2678 * DRMS (if enabled by constraints) to set the most efficient regulator 2679 * operating mode for the new regulator loading. 2680 * 2681 * Consumer devices notify their supply regulator of the maximum power 2682 * they will require (can be taken from device datasheet in the power 2683 * consumption tables) when they change operational status and hence power 2684 * state. Examples of operational state changes that can affect power 2685 * consumption are :- 2686 * 2687 * o Device is opened / closed. 2688 * o Device I/O is about to begin or has just finished. 2689 * o Device is idling in between work. 2690 * 2691 * This information is also exported via sysfs to userspace. 2692 * 2693 * DRMS will sum the total requested load on the regulator and change 2694 * to the most efficient operating mode if platform constraints allow. 2695 * 2696 * Returns the new regulator mode or error. 2697 */ 2698int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2699{ 2700 struct regulator_dev *rdev = regulator->rdev; 2701 struct regulator *consumer; 2702 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2703 unsigned int mode; 2704 2705 if (rdev->supply) 2706 input_uV = regulator_get_voltage(rdev->supply); 2707 2708 mutex_lock(&rdev->mutex); 2709 2710 /* 2711 * first check to see if we can set modes at all, otherwise just 2712 * tell the consumer everything is OK. 2713 */ 2714 regulator->uA_load = uA_load; 2715 ret = regulator_check_drms(rdev); 2716 if (ret < 0) { 2717 ret = 0; 2718 goto out; 2719 } 2720 2721 if (!rdev->desc->ops->get_optimum_mode) 2722 goto out; 2723 2724 /* 2725 * we can actually do this so any errors are indicators of 2726 * potential real failure. 2727 */ 2728 ret = -EINVAL; 2729 2730 if (!rdev->desc->ops->set_mode) 2731 goto out; 2732 2733 /* get output voltage */ 2734 output_uV = _regulator_get_voltage(rdev); 2735 if (output_uV <= 0) { 2736 rdev_err(rdev, "invalid output voltage found\n"); 2737 goto out; 2738 } 2739 2740 /* No supply? Use constraint voltage */ 2741 if (input_uV <= 0) 2742 input_uV = rdev->constraints->input_uV; 2743 if (input_uV <= 0) { 2744 rdev_err(rdev, "invalid input voltage found\n"); 2745 goto out; 2746 } 2747 2748 /* calc total requested load for this regulator */ 2749 list_for_each_entry(consumer, &rdev->consumer_list, list) 2750 total_uA_load += consumer->uA_load; 2751 2752 mode = rdev->desc->ops->get_optimum_mode(rdev, 2753 input_uV, output_uV, 2754 total_uA_load); 2755 ret = regulator_mode_constrain(rdev, &mode); 2756 if (ret < 0) { 2757 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2758 total_uA_load, input_uV, output_uV); 2759 goto out; 2760 } 2761 2762 ret = rdev->desc->ops->set_mode(rdev, mode); 2763 if (ret < 0) { 2764 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2765 goto out; 2766 } 2767 ret = mode; 2768out: 2769 mutex_unlock(&rdev->mutex); 2770 return ret; 2771} 2772EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2773 2774/** 2775 * regulator_allow_bypass - allow the regulator to go into bypass mode 2776 * 2777 * @regulator: Regulator to configure 2778 * @enable: enable or disable bypass mode 2779 * 2780 * Allow the regulator to go into bypass mode if all other consumers 2781 * for the regulator also enable bypass mode and the machine 2782 * constraints allow this. Bypass mode means that the regulator is 2783 * simply passing the input directly to the output with no regulation. 2784 */ 2785int regulator_allow_bypass(struct regulator *regulator, bool enable) 2786{ 2787 struct regulator_dev *rdev = regulator->rdev; 2788 int ret = 0; 2789 2790 if (!rdev->desc->ops->set_bypass) 2791 return 0; 2792 2793 if (rdev->constraints && 2794 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2795 return 0; 2796 2797 mutex_lock(&rdev->mutex); 2798 2799 if (enable && !regulator->bypass) { 2800 rdev->bypass_count++; 2801 2802 if (rdev->bypass_count == rdev->open_count) { 2803 ret = rdev->desc->ops->set_bypass(rdev, enable); 2804 if (ret != 0) 2805 rdev->bypass_count--; 2806 } 2807 2808 } else if (!enable && regulator->bypass) { 2809 rdev->bypass_count--; 2810 2811 if (rdev->bypass_count != rdev->open_count) { 2812 ret = rdev->desc->ops->set_bypass(rdev, enable); 2813 if (ret != 0) 2814 rdev->bypass_count++; 2815 } 2816 } 2817 2818 if (ret == 0) 2819 regulator->bypass = enable; 2820 2821 mutex_unlock(&rdev->mutex); 2822 2823 return ret; 2824} 2825EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2826 2827/** 2828 * regulator_register_notifier - register regulator event notifier 2829 * @regulator: regulator source 2830 * @nb: notifier block 2831 * 2832 * Register notifier block to receive regulator events. 2833 */ 2834int regulator_register_notifier(struct regulator *regulator, 2835 struct notifier_block *nb) 2836{ 2837 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2838 nb); 2839} 2840EXPORT_SYMBOL_GPL(regulator_register_notifier); 2841 2842/** 2843 * regulator_unregister_notifier - unregister regulator event notifier 2844 * @regulator: regulator source 2845 * @nb: notifier block 2846 * 2847 * Unregister regulator event notifier block. 2848 */ 2849int regulator_unregister_notifier(struct regulator *regulator, 2850 struct notifier_block *nb) 2851{ 2852 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2853 nb); 2854} 2855EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2856 2857/* notify regulator consumers and downstream regulator consumers. 2858 * Note mutex must be held by caller. 2859 */ 2860static void _notifier_call_chain(struct regulator_dev *rdev, 2861 unsigned long event, void *data) 2862{ 2863 /* call rdev chain first */ 2864 blocking_notifier_call_chain(&rdev->notifier, event, data); 2865} 2866 2867/** 2868 * regulator_bulk_get - get multiple regulator consumers 2869 * 2870 * @dev: Device to supply 2871 * @num_consumers: Number of consumers to register 2872 * @consumers: Configuration of consumers; clients are stored here. 2873 * 2874 * @return 0 on success, an errno on failure. 2875 * 2876 * This helper function allows drivers to get several regulator 2877 * consumers in one operation. If any of the regulators cannot be 2878 * acquired then any regulators that were allocated will be freed 2879 * before returning to the caller. 2880 */ 2881int regulator_bulk_get(struct device *dev, int num_consumers, 2882 struct regulator_bulk_data *consumers) 2883{ 2884 int i; 2885 int ret; 2886 2887 for (i = 0; i < num_consumers; i++) 2888 consumers[i].consumer = NULL; 2889 2890 for (i = 0; i < num_consumers; i++) { 2891 consumers[i].consumer = regulator_get(dev, 2892 consumers[i].supply); 2893 if (IS_ERR(consumers[i].consumer)) { 2894 ret = PTR_ERR(consumers[i].consumer); 2895 dev_err(dev, "Failed to get supply '%s': %d\n", 2896 consumers[i].supply, ret); 2897 consumers[i].consumer = NULL; 2898 goto err; 2899 } 2900 } 2901 2902 return 0; 2903 2904err: 2905 while (--i >= 0) 2906 regulator_put(consumers[i].consumer); 2907 2908 return ret; 2909} 2910EXPORT_SYMBOL_GPL(regulator_bulk_get); 2911 2912/** 2913 * devm_regulator_bulk_get - managed get multiple regulator consumers 2914 * 2915 * @dev: Device to supply 2916 * @num_consumers: Number of consumers to register 2917 * @consumers: Configuration of consumers; clients are stored here. 2918 * 2919 * @return 0 on success, an errno on failure. 2920 * 2921 * This helper function allows drivers to get several regulator 2922 * consumers in one operation with management, the regulators will 2923 * automatically be freed when the device is unbound. If any of the 2924 * regulators cannot be acquired then any regulators that were 2925 * allocated will be freed before returning to the caller. 2926 */ 2927int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2928 struct regulator_bulk_data *consumers) 2929{ 2930 int i; 2931 int ret; 2932 2933 for (i = 0; i < num_consumers; i++) 2934 consumers[i].consumer = NULL; 2935 2936 for (i = 0; i < num_consumers; i++) { 2937 consumers[i].consumer = devm_regulator_get(dev, 2938 consumers[i].supply); 2939 if (IS_ERR(consumers[i].consumer)) { 2940 ret = PTR_ERR(consumers[i].consumer); 2941 dev_err(dev, "Failed to get supply '%s': %d\n", 2942 consumers[i].supply, ret); 2943 consumers[i].consumer = NULL; 2944 goto err; 2945 } 2946 } 2947 2948 return 0; 2949 2950err: 2951 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2952 devm_regulator_put(consumers[i].consumer); 2953 2954 return ret; 2955} 2956EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2957 2958static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2959{ 2960 struct regulator_bulk_data *bulk = data; 2961 2962 bulk->ret = regulator_enable(bulk->consumer); 2963} 2964 2965/** 2966 * regulator_bulk_enable - enable multiple regulator consumers 2967 * 2968 * @num_consumers: Number of consumers 2969 * @consumers: Consumer data; clients are stored here. 2970 * @return 0 on success, an errno on failure 2971 * 2972 * This convenience API allows consumers to enable multiple regulator 2973 * clients in a single API call. If any consumers cannot be enabled 2974 * then any others that were enabled will be disabled again prior to 2975 * return. 2976 */ 2977int regulator_bulk_enable(int num_consumers, 2978 struct regulator_bulk_data *consumers) 2979{ 2980 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2981 int i; 2982 int ret = 0; 2983 2984 for (i = 0; i < num_consumers; i++) { 2985 if (consumers[i].consumer->always_on) 2986 consumers[i].ret = 0; 2987 else 2988 async_schedule_domain(regulator_bulk_enable_async, 2989 &consumers[i], &async_domain); 2990 } 2991 2992 async_synchronize_full_domain(&async_domain); 2993 2994 /* If any consumer failed we need to unwind any that succeeded */ 2995 for (i = 0; i < num_consumers; i++) { 2996 if (consumers[i].ret != 0) { 2997 ret = consumers[i].ret; 2998 goto err; 2999 } 3000 } 3001 3002 return 0; 3003 3004err: 3005 for (i = 0; i < num_consumers; i++) { 3006 if (consumers[i].ret < 0) 3007 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3008 consumers[i].ret); 3009 else 3010 regulator_disable(consumers[i].consumer); 3011 } 3012 3013 return ret; 3014} 3015EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3016 3017/** 3018 * regulator_bulk_disable - disable multiple regulator consumers 3019 * 3020 * @num_consumers: Number of consumers 3021 * @consumers: Consumer data; clients are stored here. 3022 * @return 0 on success, an errno on failure 3023 * 3024 * This convenience API allows consumers to disable multiple regulator 3025 * clients in a single API call. If any consumers cannot be disabled 3026 * then any others that were disabled will be enabled again prior to 3027 * return. 3028 */ 3029int regulator_bulk_disable(int num_consumers, 3030 struct regulator_bulk_data *consumers) 3031{ 3032 int i; 3033 int ret, r; 3034 3035 for (i = num_consumers - 1; i >= 0; --i) { 3036 ret = regulator_disable(consumers[i].consumer); 3037 if (ret != 0) 3038 goto err; 3039 } 3040 3041 return 0; 3042 3043err: 3044 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3045 for (++i; i < num_consumers; ++i) { 3046 r = regulator_enable(consumers[i].consumer); 3047 if (r != 0) 3048 pr_err("Failed to reename %s: %d\n", 3049 consumers[i].supply, r); 3050 } 3051 3052 return ret; 3053} 3054EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3055 3056/** 3057 * regulator_bulk_force_disable - force disable multiple regulator consumers 3058 * 3059 * @num_consumers: Number of consumers 3060 * @consumers: Consumer data; clients are stored here. 3061 * @return 0 on success, an errno on failure 3062 * 3063 * This convenience API allows consumers to forcibly disable multiple regulator 3064 * clients in a single API call. 3065 * NOTE: This should be used for situations when device damage will 3066 * likely occur if the regulators are not disabled (e.g. over temp). 3067 * Although regulator_force_disable function call for some consumers can 3068 * return error numbers, the function is called for all consumers. 3069 */ 3070int regulator_bulk_force_disable(int num_consumers, 3071 struct regulator_bulk_data *consumers) 3072{ 3073 int i; 3074 int ret; 3075 3076 for (i = 0; i < num_consumers; i++) 3077 consumers[i].ret = 3078 regulator_force_disable(consumers[i].consumer); 3079 3080 for (i = 0; i < num_consumers; i++) { 3081 if (consumers[i].ret != 0) { 3082 ret = consumers[i].ret; 3083 goto out; 3084 } 3085 } 3086 3087 return 0; 3088out: 3089 return ret; 3090} 3091EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3092 3093/** 3094 * regulator_bulk_free - free multiple regulator consumers 3095 * 3096 * @num_consumers: Number of consumers 3097 * @consumers: Consumer data; clients are stored here. 3098 * 3099 * This convenience API allows consumers to free multiple regulator 3100 * clients in a single API call. 3101 */ 3102void regulator_bulk_free(int num_consumers, 3103 struct regulator_bulk_data *consumers) 3104{ 3105 int i; 3106 3107 for (i = 0; i < num_consumers; i++) { 3108 regulator_put(consumers[i].consumer); 3109 consumers[i].consumer = NULL; 3110 } 3111} 3112EXPORT_SYMBOL_GPL(regulator_bulk_free); 3113 3114/** 3115 * regulator_notifier_call_chain - call regulator event notifier 3116 * @rdev: regulator source 3117 * @event: notifier block 3118 * @data: callback-specific data. 3119 * 3120 * Called by regulator drivers to notify clients a regulator event has 3121 * occurred. We also notify regulator clients downstream. 3122 * Note lock must be held by caller. 3123 */ 3124int regulator_notifier_call_chain(struct regulator_dev *rdev, 3125 unsigned long event, void *data) 3126{ 3127 _notifier_call_chain(rdev, event, data); 3128 return NOTIFY_DONE; 3129 3130} 3131EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3132 3133/** 3134 * regulator_mode_to_status - convert a regulator mode into a status 3135 * 3136 * @mode: Mode to convert 3137 * 3138 * Convert a regulator mode into a status. 3139 */ 3140int regulator_mode_to_status(unsigned int mode) 3141{ 3142 switch (mode) { 3143 case REGULATOR_MODE_FAST: 3144 return REGULATOR_STATUS_FAST; 3145 case REGULATOR_MODE_NORMAL: 3146 return REGULATOR_STATUS_NORMAL; 3147 case REGULATOR_MODE_IDLE: 3148 return REGULATOR_STATUS_IDLE; 3149 case REGULATOR_MODE_STANDBY: 3150 return REGULATOR_STATUS_STANDBY; 3151 default: 3152 return REGULATOR_STATUS_UNDEFINED; 3153 } 3154} 3155EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3156 3157/* 3158 * To avoid cluttering sysfs (and memory) with useless state, only 3159 * create attributes that can be meaningfully displayed. 3160 */ 3161static int add_regulator_attributes(struct regulator_dev *rdev) 3162{ 3163 struct device *dev = &rdev->dev; 3164 struct regulator_ops *ops = rdev->desc->ops; 3165 int status = 0; 3166 3167 /* some attributes need specific methods to be displayed */ 3168 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3169 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3170 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3171 status = device_create_file(dev, &dev_attr_microvolts); 3172 if (status < 0) 3173 return status; 3174 } 3175 if (ops->get_current_limit) { 3176 status = device_create_file(dev, &dev_attr_microamps); 3177 if (status < 0) 3178 return status; 3179 } 3180 if (ops->get_mode) { 3181 status = device_create_file(dev, &dev_attr_opmode); 3182 if (status < 0) 3183 return status; 3184 } 3185 if (rdev->ena_pin || ops->is_enabled) { 3186 status = device_create_file(dev, &dev_attr_state); 3187 if (status < 0) 3188 return status; 3189 } 3190 if (ops->get_status) { 3191 status = device_create_file(dev, &dev_attr_status); 3192 if (status < 0) 3193 return status; 3194 } 3195 if (ops->get_bypass) { 3196 status = device_create_file(dev, &dev_attr_bypass); 3197 if (status < 0) 3198 return status; 3199 } 3200 3201 /* some attributes are type-specific */ 3202 if (rdev->desc->type == REGULATOR_CURRENT) { 3203 status = device_create_file(dev, &dev_attr_requested_microamps); 3204 if (status < 0) 3205 return status; 3206 } 3207 3208 /* all the other attributes exist to support constraints; 3209 * don't show them if there are no constraints, or if the 3210 * relevant supporting methods are missing. 3211 */ 3212 if (!rdev->constraints) 3213 return status; 3214 3215 /* constraints need specific supporting methods */ 3216 if (ops->set_voltage || ops->set_voltage_sel) { 3217 status = device_create_file(dev, &dev_attr_min_microvolts); 3218 if (status < 0) 3219 return status; 3220 status = device_create_file(dev, &dev_attr_max_microvolts); 3221 if (status < 0) 3222 return status; 3223 } 3224 if (ops->set_current_limit) { 3225 status = device_create_file(dev, &dev_attr_min_microamps); 3226 if (status < 0) 3227 return status; 3228 status = device_create_file(dev, &dev_attr_max_microamps); 3229 if (status < 0) 3230 return status; 3231 } 3232 3233 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3234 if (status < 0) 3235 return status; 3236 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3237 if (status < 0) 3238 return status; 3239 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3240 if (status < 0) 3241 return status; 3242 3243 if (ops->set_suspend_voltage) { 3244 status = device_create_file(dev, 3245 &dev_attr_suspend_standby_microvolts); 3246 if (status < 0) 3247 return status; 3248 status = device_create_file(dev, 3249 &dev_attr_suspend_mem_microvolts); 3250 if (status < 0) 3251 return status; 3252 status = device_create_file(dev, 3253 &dev_attr_suspend_disk_microvolts); 3254 if (status < 0) 3255 return status; 3256 } 3257 3258 if (ops->set_suspend_mode) { 3259 status = device_create_file(dev, 3260 &dev_attr_suspend_standby_mode); 3261 if (status < 0) 3262 return status; 3263 status = device_create_file(dev, 3264 &dev_attr_suspend_mem_mode); 3265 if (status < 0) 3266 return status; 3267 status = device_create_file(dev, 3268 &dev_attr_suspend_disk_mode); 3269 if (status < 0) 3270 return status; 3271 } 3272 3273 return status; 3274} 3275 3276static void rdev_init_debugfs(struct regulator_dev *rdev) 3277{ 3278 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3279 if (!rdev->debugfs) { 3280 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3281 return; 3282 } 3283 3284 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3285 &rdev->use_count); 3286 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3287 &rdev->open_count); 3288 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3289 &rdev->bypass_count); 3290} 3291 3292/** 3293 * regulator_register - register regulator 3294 * @regulator_desc: regulator to register 3295 * @config: runtime configuration for regulator 3296 * 3297 * Called by regulator drivers to register a regulator. 3298 * Returns a valid pointer to struct regulator_dev on success 3299 * or an ERR_PTR() on error. 3300 */ 3301struct regulator_dev * 3302regulator_register(const struct regulator_desc *regulator_desc, 3303 const struct regulator_config *config) 3304{ 3305 const struct regulation_constraints *constraints = NULL; 3306 const struct regulator_init_data *init_data; 3307 static atomic_t regulator_no = ATOMIC_INIT(0); 3308 struct regulator_dev *rdev; 3309 struct device *dev; 3310 int ret, i; 3311 const char *supply = NULL; 3312 3313 if (regulator_desc == NULL || config == NULL) 3314 return ERR_PTR(-EINVAL); 3315 3316 dev = config->dev; 3317 WARN_ON(!dev); 3318 3319 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3320 return ERR_PTR(-EINVAL); 3321 3322 if (regulator_desc->type != REGULATOR_VOLTAGE && 3323 regulator_desc->type != REGULATOR_CURRENT) 3324 return ERR_PTR(-EINVAL); 3325 3326 /* Only one of each should be implemented */ 3327 WARN_ON(regulator_desc->ops->get_voltage && 3328 regulator_desc->ops->get_voltage_sel); 3329 WARN_ON(regulator_desc->ops->set_voltage && 3330 regulator_desc->ops->set_voltage_sel); 3331 3332 /* If we're using selectors we must implement list_voltage. */ 3333 if (regulator_desc->ops->get_voltage_sel && 3334 !regulator_desc->ops->list_voltage) { 3335 return ERR_PTR(-EINVAL); 3336 } 3337 if (regulator_desc->ops->set_voltage_sel && 3338 !regulator_desc->ops->list_voltage) { 3339 return ERR_PTR(-EINVAL); 3340 } 3341 3342 init_data = config->init_data; 3343 3344 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3345 if (rdev == NULL) 3346 return ERR_PTR(-ENOMEM); 3347 3348 mutex_lock(®ulator_list_mutex); 3349 3350 mutex_init(&rdev->mutex); 3351 rdev->reg_data = config->driver_data; 3352 rdev->owner = regulator_desc->owner; 3353 rdev->desc = regulator_desc; 3354 if (config->regmap) 3355 rdev->regmap = config->regmap; 3356 else if (dev_get_regmap(dev, NULL)) 3357 rdev->regmap = dev_get_regmap(dev, NULL); 3358 else if (dev->parent) 3359 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3360 INIT_LIST_HEAD(&rdev->consumer_list); 3361 INIT_LIST_HEAD(&rdev->list); 3362 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3363 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3364 3365 /* preform any regulator specific init */ 3366 if (init_data && init_data->regulator_init) { 3367 ret = init_data->regulator_init(rdev->reg_data); 3368 if (ret < 0) 3369 goto clean; 3370 } 3371 3372 /* register with sysfs */ 3373 rdev->dev.class = ®ulator_class; 3374 rdev->dev.of_node = config->of_node; 3375 rdev->dev.parent = dev; 3376 dev_set_name(&rdev->dev, "regulator.%d", 3377 atomic_inc_return(®ulator_no) - 1); 3378 ret = device_register(&rdev->dev); 3379 if (ret != 0) { 3380 put_device(&rdev->dev); 3381 goto clean; 3382 } 3383 3384 dev_set_drvdata(&rdev->dev, rdev); 3385 3386 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3387 ret = regulator_ena_gpio_request(rdev, config); 3388 if (ret != 0) { 3389 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3390 config->ena_gpio, ret); 3391 goto wash; 3392 } 3393 3394 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3395 rdev->ena_gpio_state = 1; 3396 3397 if (config->ena_gpio_invert) 3398 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3399 } 3400 3401 /* set regulator constraints */ 3402 if (init_data) 3403 constraints = &init_data->constraints; 3404 3405 ret = set_machine_constraints(rdev, constraints); 3406 if (ret < 0) 3407 goto scrub; 3408 3409 /* add attributes supported by this regulator */ 3410 ret = add_regulator_attributes(rdev); 3411 if (ret < 0) 3412 goto scrub; 3413 3414 if (init_data && init_data->supply_regulator) 3415 supply = init_data->supply_regulator; 3416 else if (regulator_desc->supply_name) 3417 supply = regulator_desc->supply_name; 3418 3419 if (supply) { 3420 struct regulator_dev *r; 3421 3422 r = regulator_dev_lookup(dev, supply, &ret); 3423 3424 if (ret == -ENODEV) { 3425 /* 3426 * No supply was specified for this regulator and 3427 * there will never be one. 3428 */ 3429 ret = 0; 3430 goto add_dev; 3431 } else if (!r) { 3432 dev_err(dev, "Failed to find supply %s\n", supply); 3433 ret = -EPROBE_DEFER; 3434 goto scrub; 3435 } 3436 3437 ret = set_supply(rdev, r); 3438 if (ret < 0) 3439 goto scrub; 3440 3441 /* Enable supply if rail is enabled */ 3442 if (_regulator_is_enabled(rdev)) { 3443 ret = regulator_enable(rdev->supply); 3444 if (ret < 0) 3445 goto scrub; 3446 } 3447 } 3448 3449add_dev: 3450 /* add consumers devices */ 3451 if (init_data) { 3452 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3453 ret = set_consumer_device_supply(rdev, 3454 init_data->consumer_supplies[i].dev_name, 3455 init_data->consumer_supplies[i].supply); 3456 if (ret < 0) { 3457 dev_err(dev, "Failed to set supply %s\n", 3458 init_data->consumer_supplies[i].supply); 3459 goto unset_supplies; 3460 } 3461 } 3462 } 3463 3464 list_add(&rdev->list, ®ulator_list); 3465 3466 rdev_init_debugfs(rdev); 3467out: 3468 mutex_unlock(®ulator_list_mutex); 3469 return rdev; 3470 3471unset_supplies: 3472 unset_regulator_supplies(rdev); 3473 3474scrub: 3475 if (rdev->supply) 3476 _regulator_put(rdev->supply); 3477 regulator_ena_gpio_free(rdev); 3478 kfree(rdev->constraints); 3479wash: 3480 device_unregister(&rdev->dev); 3481 /* device core frees rdev */ 3482 rdev = ERR_PTR(ret); 3483 goto out; 3484 3485clean: 3486 kfree(rdev); 3487 rdev = ERR_PTR(ret); 3488 goto out; 3489} 3490EXPORT_SYMBOL_GPL(regulator_register); 3491 3492/** 3493 * regulator_unregister - unregister regulator 3494 * @rdev: regulator to unregister 3495 * 3496 * Called by regulator drivers to unregister a regulator. 3497 */ 3498void regulator_unregister(struct regulator_dev *rdev) 3499{ 3500 if (rdev == NULL) 3501 return; 3502 3503 if (rdev->supply) { 3504 while (rdev->use_count--) 3505 regulator_disable(rdev->supply); 3506 regulator_put(rdev->supply); 3507 } 3508 mutex_lock(®ulator_list_mutex); 3509 debugfs_remove_recursive(rdev->debugfs); 3510 flush_work(&rdev->disable_work.work); 3511 WARN_ON(rdev->open_count); 3512 unset_regulator_supplies(rdev); 3513 list_del(&rdev->list); 3514 kfree(rdev->constraints); 3515 regulator_ena_gpio_free(rdev); 3516 device_unregister(&rdev->dev); 3517 mutex_unlock(®ulator_list_mutex); 3518} 3519EXPORT_SYMBOL_GPL(regulator_unregister); 3520 3521/** 3522 * regulator_suspend_prepare - prepare regulators for system wide suspend 3523 * @state: system suspend state 3524 * 3525 * Configure each regulator with it's suspend operating parameters for state. 3526 * This will usually be called by machine suspend code prior to supending. 3527 */ 3528int regulator_suspend_prepare(suspend_state_t state) 3529{ 3530 struct regulator_dev *rdev; 3531 int ret = 0; 3532 3533 /* ON is handled by regulator active state */ 3534 if (state == PM_SUSPEND_ON) 3535 return -EINVAL; 3536 3537 mutex_lock(®ulator_list_mutex); 3538 list_for_each_entry(rdev, ®ulator_list, list) { 3539 3540 mutex_lock(&rdev->mutex); 3541 ret = suspend_prepare(rdev, state); 3542 mutex_unlock(&rdev->mutex); 3543 3544 if (ret < 0) { 3545 rdev_err(rdev, "failed to prepare\n"); 3546 goto out; 3547 } 3548 } 3549out: 3550 mutex_unlock(®ulator_list_mutex); 3551 return ret; 3552} 3553EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3554 3555/** 3556 * regulator_suspend_finish - resume regulators from system wide suspend 3557 * 3558 * Turn on regulators that might be turned off by regulator_suspend_prepare 3559 * and that should be turned on according to the regulators properties. 3560 */ 3561int regulator_suspend_finish(void) 3562{ 3563 struct regulator_dev *rdev; 3564 int ret = 0, error; 3565 3566 mutex_lock(®ulator_list_mutex); 3567 list_for_each_entry(rdev, ®ulator_list, list) { 3568 struct regulator_ops *ops = rdev->desc->ops; 3569 3570 mutex_lock(&rdev->mutex); 3571 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3572 ops->enable) { 3573 error = ops->enable(rdev); 3574 if (error) 3575 ret = error; 3576 } else { 3577 if (!has_full_constraints) 3578 goto unlock; 3579 if (!ops->disable) 3580 goto unlock; 3581 if (!_regulator_is_enabled(rdev)) 3582 goto unlock; 3583 3584 error = ops->disable(rdev); 3585 if (error) 3586 ret = error; 3587 } 3588unlock: 3589 mutex_unlock(&rdev->mutex); 3590 } 3591 mutex_unlock(®ulator_list_mutex); 3592 return ret; 3593} 3594EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3595 3596/** 3597 * regulator_has_full_constraints - the system has fully specified constraints 3598 * 3599 * Calling this function will cause the regulator API to disable all 3600 * regulators which have a zero use count and don't have an always_on 3601 * constraint in a late_initcall. 3602 * 3603 * The intention is that this will become the default behaviour in a 3604 * future kernel release so users are encouraged to use this facility 3605 * now. 3606 */ 3607void regulator_has_full_constraints(void) 3608{ 3609 has_full_constraints = 1; 3610} 3611EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3612 3613/** 3614 * rdev_get_drvdata - get rdev regulator driver data 3615 * @rdev: regulator 3616 * 3617 * Get rdev regulator driver private data. This call can be used in the 3618 * regulator driver context. 3619 */ 3620void *rdev_get_drvdata(struct regulator_dev *rdev) 3621{ 3622 return rdev->reg_data; 3623} 3624EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3625 3626/** 3627 * regulator_get_drvdata - get regulator driver data 3628 * @regulator: regulator 3629 * 3630 * Get regulator driver private data. This call can be used in the consumer 3631 * driver context when non API regulator specific functions need to be called. 3632 */ 3633void *regulator_get_drvdata(struct regulator *regulator) 3634{ 3635 return regulator->rdev->reg_data; 3636} 3637EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3638 3639/** 3640 * regulator_set_drvdata - set regulator driver data 3641 * @regulator: regulator 3642 * @data: data 3643 */ 3644void regulator_set_drvdata(struct regulator *regulator, void *data) 3645{ 3646 regulator->rdev->reg_data = data; 3647} 3648EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3649 3650/** 3651 * regulator_get_id - get regulator ID 3652 * @rdev: regulator 3653 */ 3654int rdev_get_id(struct regulator_dev *rdev) 3655{ 3656 return rdev->desc->id; 3657} 3658EXPORT_SYMBOL_GPL(rdev_get_id); 3659 3660struct device *rdev_get_dev(struct regulator_dev *rdev) 3661{ 3662 return &rdev->dev; 3663} 3664EXPORT_SYMBOL_GPL(rdev_get_dev); 3665 3666void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3667{ 3668 return reg_init_data->driver_data; 3669} 3670EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3671 3672#ifdef CONFIG_DEBUG_FS 3673static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3674 size_t count, loff_t *ppos) 3675{ 3676 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3677 ssize_t len, ret = 0; 3678 struct regulator_map *map; 3679 3680 if (!buf) 3681 return -ENOMEM; 3682 3683 list_for_each_entry(map, ®ulator_map_list, list) { 3684 len = snprintf(buf + ret, PAGE_SIZE - ret, 3685 "%s -> %s.%s\n", 3686 rdev_get_name(map->regulator), map->dev_name, 3687 map->supply); 3688 if (len >= 0) 3689 ret += len; 3690 if (ret > PAGE_SIZE) { 3691 ret = PAGE_SIZE; 3692 break; 3693 } 3694 } 3695 3696 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3697 3698 kfree(buf); 3699 3700 return ret; 3701} 3702#endif 3703 3704static const struct file_operations supply_map_fops = { 3705#ifdef CONFIG_DEBUG_FS 3706 .read = supply_map_read_file, 3707 .llseek = default_llseek, 3708#endif 3709}; 3710 3711static int __init regulator_init(void) 3712{ 3713 int ret; 3714 3715 ret = class_register(®ulator_class); 3716 3717 debugfs_root = debugfs_create_dir("regulator", NULL); 3718 if (!debugfs_root) 3719 pr_warn("regulator: Failed to create debugfs directory\n"); 3720 3721 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3722 &supply_map_fops); 3723 3724 regulator_dummy_init(); 3725 3726 return ret; 3727} 3728 3729/* init early to allow our consumers to complete system booting */ 3730core_initcall(regulator_init); 3731 3732static int __init regulator_init_complete(void) 3733{ 3734 struct regulator_dev *rdev; 3735 struct regulator_ops *ops; 3736 struct regulation_constraints *c; 3737 int enabled, ret; 3738 3739 /* 3740 * Since DT doesn't provide an idiomatic mechanism for 3741 * enabling full constraints and since it's much more natural 3742 * with DT to provide them just assume that a DT enabled 3743 * system has full constraints. 3744 */ 3745 if (of_have_populated_dt()) 3746 has_full_constraints = true; 3747 3748 mutex_lock(®ulator_list_mutex); 3749 3750 /* If we have a full configuration then disable any regulators 3751 * which are not in use or always_on. This will become the 3752 * default behaviour in the future. 3753 */ 3754 list_for_each_entry(rdev, ®ulator_list, list) { 3755 ops = rdev->desc->ops; 3756 c = rdev->constraints; 3757 3758 if (!ops->disable || (c && c->always_on)) 3759 continue; 3760 3761 mutex_lock(&rdev->mutex); 3762 3763 if (rdev->use_count) 3764 goto unlock; 3765 3766 /* If we can't read the status assume it's on. */ 3767 if (ops->is_enabled) 3768 enabled = ops->is_enabled(rdev); 3769 else 3770 enabled = 1; 3771 3772 if (!enabled) 3773 goto unlock; 3774 3775 if (has_full_constraints) { 3776 /* We log since this may kill the system if it 3777 * goes wrong. */ 3778 rdev_info(rdev, "disabling\n"); 3779 ret = ops->disable(rdev); 3780 if (ret != 0) { 3781 rdev_err(rdev, "couldn't disable: %d\n", ret); 3782 } 3783 } else { 3784 /* The intention is that in future we will 3785 * assume that full constraints are provided 3786 * so warn even if we aren't going to do 3787 * anything here. 3788 */ 3789 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3790 } 3791 3792unlock: 3793 mutex_unlock(&rdev->mutex); 3794 } 3795 3796 mutex_unlock(®ulator_list_mutex); 3797 3798 return 0; 3799} 3800late_initcall(regulator_init_complete); 3801