core.c revision 4f0ac6dabf867095b31f851ba0d0ceaca2f87e2e
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 = 0; 1251 1252 if (id == NULL) { 1253 pr_err("get() with no identifier\n"); 1254 return regulator; 1255 } 1256 1257 if (dev) 1258 devname = dev_name(dev); 1259 1260 mutex_lock(®ulator_list_mutex); 1261 1262 rdev = regulator_dev_lookup(dev, id, &ret); 1263 if (rdev) 1264 goto found; 1265 1266 /* 1267 * If we have return value from dev_lookup fail, we do not expect to 1268 * succeed, so, quit with appropriate error value 1269 */ 1270 if (ret && ret != -ENODEV) { 1271 regulator = ERR_PTR(ret); 1272 goto out; 1273 } 1274 1275 if (!devname) 1276 devname = "deviceless"; 1277 1278 /* 1279 * Assume that a regulator is physically present and enabled 1280 * even if it isn't hooked up and just provide a dummy. 1281 */ 1282 if (has_full_constraints && allow_dummy) { 1283 /* 1284 * Log the substitution if regulator configuration is 1285 * not complete to help development. 1286 */ 1287 if (!has_full_constraints) 1288 pr_warn("%s supply %s not found, using dummy regulator\n", 1289 devname, id); 1290 1291 rdev = dummy_regulator_rdev; 1292 goto found; 1293 } else { 1294 dev_err(dev, "dummy supplies not allowed\n"); 1295 } 1296 1297 mutex_unlock(®ulator_list_mutex); 1298 return regulator; 1299 1300found: 1301 if (rdev->exclusive) { 1302 regulator = ERR_PTR(-EPERM); 1303 goto out; 1304 } 1305 1306 if (exclusive && rdev->open_count) { 1307 regulator = ERR_PTR(-EBUSY); 1308 goto out; 1309 } 1310 1311 if (!try_module_get(rdev->owner)) 1312 goto out; 1313 1314 regulator = create_regulator(rdev, dev, id); 1315 if (regulator == NULL) { 1316 regulator = ERR_PTR(-ENOMEM); 1317 module_put(rdev->owner); 1318 goto out; 1319 } 1320 1321 rdev->open_count++; 1322 if (exclusive) { 1323 rdev->exclusive = 1; 1324 1325 ret = _regulator_is_enabled(rdev); 1326 if (ret > 0) 1327 rdev->use_count = 1; 1328 else 1329 rdev->use_count = 0; 1330 } 1331 1332out: 1333 mutex_unlock(®ulator_list_mutex); 1334 1335 return regulator; 1336} 1337 1338/** 1339 * regulator_get - lookup and obtain a reference to a regulator. 1340 * @dev: device for regulator "consumer" 1341 * @id: Supply name or regulator ID. 1342 * 1343 * Returns a struct regulator corresponding to the regulator producer, 1344 * or IS_ERR() condition containing errno. 1345 * 1346 * Use of supply names configured via regulator_set_device_supply() is 1347 * strongly encouraged. It is recommended that the supply name used 1348 * should match the name used for the supply and/or the relevant 1349 * device pins in the datasheet. 1350 */ 1351struct regulator *regulator_get(struct device *dev, const char *id) 1352{ 1353 return _regulator_get(dev, id, false, true); 1354} 1355EXPORT_SYMBOL_GPL(regulator_get); 1356 1357static void devm_regulator_release(struct device *dev, void *res) 1358{ 1359 regulator_put(*(struct regulator **)res); 1360} 1361 1362/** 1363 * devm_regulator_get - Resource managed regulator_get() 1364 * @dev: device for regulator "consumer" 1365 * @id: Supply name or regulator ID. 1366 * 1367 * Managed regulator_get(). Regulators returned from this function are 1368 * automatically regulator_put() on driver detach. See regulator_get() for more 1369 * information. 1370 */ 1371struct regulator *devm_regulator_get(struct device *dev, const char *id) 1372{ 1373 struct regulator **ptr, *regulator; 1374 1375 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1376 if (!ptr) 1377 return ERR_PTR(-ENOMEM); 1378 1379 regulator = regulator_get(dev, id); 1380 if (!IS_ERR(regulator)) { 1381 *ptr = regulator; 1382 devres_add(dev, ptr); 1383 } else { 1384 devres_free(ptr); 1385 } 1386 1387 return regulator; 1388} 1389EXPORT_SYMBOL_GPL(devm_regulator_get); 1390 1391/** 1392 * regulator_get_exclusive - obtain exclusive access to a regulator. 1393 * @dev: device for regulator "consumer" 1394 * @id: Supply name or regulator ID. 1395 * 1396 * Returns a struct regulator corresponding to the regulator producer, 1397 * or IS_ERR() condition containing errno. Other consumers will be 1398 * unable to obtain this reference is held and the use count for the 1399 * regulator will be initialised to reflect the current state of the 1400 * regulator. 1401 * 1402 * This is intended for use by consumers which cannot tolerate shared 1403 * use of the regulator such as those which need to force the 1404 * regulator off for correct operation of the hardware they are 1405 * controlling. 1406 * 1407 * Use of supply names configured via regulator_set_device_supply() is 1408 * strongly encouraged. It is recommended that the supply name used 1409 * should match the name used for the supply and/or the relevant 1410 * device pins in the datasheet. 1411 */ 1412struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1413{ 1414 return _regulator_get(dev, id, true, false); 1415} 1416EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1417 1418/** 1419 * regulator_get_optional - obtain optional access to a regulator. 1420 * @dev: device for regulator "consumer" 1421 * @id: Supply name or regulator ID. 1422 * 1423 * Returns a struct regulator corresponding to the regulator producer, 1424 * or IS_ERR() condition containing errno. Other consumers will be 1425 * unable to obtain this reference is held and the use count for the 1426 * regulator will be initialised to reflect the current state of the 1427 * regulator. 1428 * 1429 * This is intended for use by consumers for devices which can have 1430 * some supplies unconnected in normal use, such as some MMC devices. 1431 * It can allow the regulator core to provide stub supplies for other 1432 * supplies requested using normal regulator_get() calls without 1433 * disrupting the operation of drivers that can handle absent 1434 * supplies. 1435 * 1436 * Use of supply names configured via regulator_set_device_supply() is 1437 * strongly encouraged. It is recommended that the supply name used 1438 * should match the name used for the supply and/or the relevant 1439 * device pins in the datasheet. 1440 */ 1441struct regulator *regulator_get_optional(struct device *dev, const char *id) 1442{ 1443 return _regulator_get(dev, id, false, false); 1444} 1445EXPORT_SYMBOL_GPL(regulator_get_optional); 1446 1447/** 1448 * devm_regulator_get_optional - Resource managed regulator_get_optional() 1449 * @dev: device for regulator "consumer" 1450 * @id: Supply name or regulator ID. 1451 * 1452 * Managed regulator_get_optional(). Regulators returned from this 1453 * function are automatically regulator_put() on driver detach. See 1454 * regulator_get_optional() for more information. 1455 */ 1456struct regulator *devm_regulator_get_optional(struct device *dev, 1457 const char *id) 1458{ 1459 struct regulator **ptr, *regulator; 1460 1461 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1462 if (!ptr) 1463 return ERR_PTR(-ENOMEM); 1464 1465 regulator = regulator_get_optional(dev, id); 1466 if (!IS_ERR(regulator)) { 1467 *ptr = regulator; 1468 devres_add(dev, ptr); 1469 } else { 1470 devres_free(ptr); 1471 } 1472 1473 return regulator; 1474} 1475EXPORT_SYMBOL_GPL(devm_regulator_get_optional); 1476 1477/* Locks held by regulator_put() */ 1478static void _regulator_put(struct regulator *regulator) 1479{ 1480 struct regulator_dev *rdev; 1481 1482 if (regulator == NULL || IS_ERR(regulator)) 1483 return; 1484 1485 rdev = regulator->rdev; 1486 1487 debugfs_remove_recursive(regulator->debugfs); 1488 1489 /* remove any sysfs entries */ 1490 if (regulator->dev) 1491 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1492 kfree(regulator->supply_name); 1493 list_del(®ulator->list); 1494 kfree(regulator); 1495 1496 rdev->open_count--; 1497 rdev->exclusive = 0; 1498 1499 module_put(rdev->owner); 1500} 1501 1502/** 1503 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive() 1504 * @dev: device for regulator "consumer" 1505 * @id: Supply name or regulator ID. 1506 * 1507 * Managed regulator_get_exclusive(). Regulators returned from this function 1508 * are automatically regulator_put() on driver detach. See regulator_get() for 1509 * more information. 1510 */ 1511struct regulator *devm_regulator_get_exclusive(struct device *dev, 1512 const char *id) 1513{ 1514 struct regulator **ptr, *regulator; 1515 1516 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1517 if (!ptr) 1518 return ERR_PTR(-ENOMEM); 1519 1520 regulator = _regulator_get(dev, id, 1); 1521 if (!IS_ERR(regulator)) { 1522 *ptr = regulator; 1523 devres_add(dev, ptr); 1524 } else { 1525 devres_free(ptr); 1526 } 1527 1528 return regulator; 1529} 1530EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive); 1531 1532/** 1533 * regulator_put - "free" the regulator source 1534 * @regulator: regulator source 1535 * 1536 * Note: drivers must ensure that all regulator_enable calls made on this 1537 * regulator source are balanced by regulator_disable calls prior to calling 1538 * this function. 1539 */ 1540void regulator_put(struct regulator *regulator) 1541{ 1542 mutex_lock(®ulator_list_mutex); 1543 _regulator_put(regulator); 1544 mutex_unlock(®ulator_list_mutex); 1545} 1546EXPORT_SYMBOL_GPL(regulator_put); 1547 1548static int devm_regulator_match(struct device *dev, void *res, void *data) 1549{ 1550 struct regulator **r = res; 1551 if (!r || !*r) { 1552 WARN_ON(!r || !*r); 1553 return 0; 1554 } 1555 return *r == data; 1556} 1557 1558/** 1559 * devm_regulator_put - Resource managed regulator_put() 1560 * @regulator: regulator to free 1561 * 1562 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1563 * this function will not need to be called and the resource management 1564 * code will ensure that the resource is freed. 1565 */ 1566void devm_regulator_put(struct regulator *regulator) 1567{ 1568 int rc; 1569 1570 rc = devres_release(regulator->dev, devm_regulator_release, 1571 devm_regulator_match, regulator); 1572 if (rc != 0) 1573 WARN_ON(rc); 1574} 1575EXPORT_SYMBOL_GPL(devm_regulator_put); 1576 1577/* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ 1578static int regulator_ena_gpio_request(struct regulator_dev *rdev, 1579 const struct regulator_config *config) 1580{ 1581 struct regulator_enable_gpio *pin; 1582 int ret; 1583 1584 list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { 1585 if (pin->gpio == config->ena_gpio) { 1586 rdev_dbg(rdev, "GPIO %d is already used\n", 1587 config->ena_gpio); 1588 goto update_ena_gpio_to_rdev; 1589 } 1590 } 1591 1592 ret = gpio_request_one(config->ena_gpio, 1593 GPIOF_DIR_OUT | config->ena_gpio_flags, 1594 rdev_get_name(rdev)); 1595 if (ret) 1596 return ret; 1597 1598 pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); 1599 if (pin == NULL) { 1600 gpio_free(config->ena_gpio); 1601 return -ENOMEM; 1602 } 1603 1604 pin->gpio = config->ena_gpio; 1605 pin->ena_gpio_invert = config->ena_gpio_invert; 1606 list_add(&pin->list, ®ulator_ena_gpio_list); 1607 1608update_ena_gpio_to_rdev: 1609 pin->request_count++; 1610 rdev->ena_pin = pin; 1611 return 0; 1612} 1613 1614static void regulator_ena_gpio_free(struct regulator_dev *rdev) 1615{ 1616 struct regulator_enable_gpio *pin, *n; 1617 1618 if (!rdev->ena_pin) 1619 return; 1620 1621 /* Free the GPIO only in case of no use */ 1622 list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { 1623 if (pin->gpio == rdev->ena_pin->gpio) { 1624 if (pin->request_count <= 1) { 1625 pin->request_count = 0; 1626 gpio_free(pin->gpio); 1627 list_del(&pin->list); 1628 kfree(pin); 1629 } else { 1630 pin->request_count--; 1631 } 1632 } 1633 } 1634} 1635 1636/** 1637 * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control 1638 * @rdev: regulator_dev structure 1639 * @enable: enable GPIO at initial use? 1640 * 1641 * GPIO is enabled in case of initial use. (enable_count is 0) 1642 * GPIO is disabled when it is not shared any more. (enable_count <= 1) 1643 */ 1644static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) 1645{ 1646 struct regulator_enable_gpio *pin = rdev->ena_pin; 1647 1648 if (!pin) 1649 return -EINVAL; 1650 1651 if (enable) { 1652 /* Enable GPIO at initial use */ 1653 if (pin->enable_count == 0) 1654 gpio_set_value_cansleep(pin->gpio, 1655 !pin->ena_gpio_invert); 1656 1657 pin->enable_count++; 1658 } else { 1659 if (pin->enable_count > 1) { 1660 pin->enable_count--; 1661 return 0; 1662 } 1663 1664 /* Disable GPIO if not used */ 1665 if (pin->enable_count <= 1) { 1666 gpio_set_value_cansleep(pin->gpio, 1667 pin->ena_gpio_invert); 1668 pin->enable_count = 0; 1669 } 1670 } 1671 1672 return 0; 1673} 1674 1675static int _regulator_do_enable(struct regulator_dev *rdev) 1676{ 1677 int ret, delay; 1678 1679 /* Query before enabling in case configuration dependent. */ 1680 ret = _regulator_get_enable_time(rdev); 1681 if (ret >= 0) { 1682 delay = ret; 1683 } else { 1684 rdev_warn(rdev, "enable_time() failed: %d\n", ret); 1685 delay = 0; 1686 } 1687 1688 trace_regulator_enable(rdev_get_name(rdev)); 1689 1690 if (rdev->ena_pin) { 1691 ret = regulator_ena_gpio_ctrl(rdev, true); 1692 if (ret < 0) 1693 return ret; 1694 rdev->ena_gpio_state = 1; 1695 } else if (rdev->desc->ops->enable) { 1696 ret = rdev->desc->ops->enable(rdev); 1697 if (ret < 0) 1698 return ret; 1699 } else { 1700 return -EINVAL; 1701 } 1702 1703 /* Allow the regulator to ramp; it would be useful to extend 1704 * this for bulk operations so that the regulators can ramp 1705 * together. */ 1706 trace_regulator_enable_delay(rdev_get_name(rdev)); 1707 1708 if (delay >= 1000) { 1709 mdelay(delay / 1000); 1710 udelay(delay % 1000); 1711 } else if (delay) { 1712 udelay(delay); 1713 } 1714 1715 trace_regulator_enable_complete(rdev_get_name(rdev)); 1716 1717 return 0; 1718} 1719 1720/* locks held by regulator_enable() */ 1721static int _regulator_enable(struct regulator_dev *rdev) 1722{ 1723 int ret; 1724 1725 /* check voltage and requested load before enabling */ 1726 if (rdev->constraints && 1727 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1728 drms_uA_update(rdev); 1729 1730 if (rdev->use_count == 0) { 1731 /* The regulator may on if it's not switchable or left on */ 1732 ret = _regulator_is_enabled(rdev); 1733 if (ret == -EINVAL || ret == 0) { 1734 if (!_regulator_can_change_status(rdev)) 1735 return -EPERM; 1736 1737 ret = _regulator_do_enable(rdev); 1738 if (ret < 0) 1739 return ret; 1740 1741 } else if (ret < 0) { 1742 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1743 return ret; 1744 } 1745 /* Fallthrough on positive return values - already enabled */ 1746 } 1747 1748 rdev->use_count++; 1749 1750 return 0; 1751} 1752 1753/** 1754 * regulator_enable - enable regulator output 1755 * @regulator: regulator source 1756 * 1757 * Request that the regulator be enabled with the regulator output at 1758 * the predefined voltage or current value. Calls to regulator_enable() 1759 * must be balanced with calls to regulator_disable(). 1760 * 1761 * NOTE: the output value can be set by other drivers, boot loader or may be 1762 * hardwired in the regulator. 1763 */ 1764int regulator_enable(struct regulator *regulator) 1765{ 1766 struct regulator_dev *rdev = regulator->rdev; 1767 int ret = 0; 1768 1769 if (regulator->always_on) 1770 return 0; 1771 1772 if (rdev->supply) { 1773 ret = regulator_enable(rdev->supply); 1774 if (ret != 0) 1775 return ret; 1776 } 1777 1778 mutex_lock(&rdev->mutex); 1779 ret = _regulator_enable(rdev); 1780 mutex_unlock(&rdev->mutex); 1781 1782 if (ret != 0 && rdev->supply) 1783 regulator_disable(rdev->supply); 1784 1785 return ret; 1786} 1787EXPORT_SYMBOL_GPL(regulator_enable); 1788 1789static int _regulator_do_disable(struct regulator_dev *rdev) 1790{ 1791 int ret; 1792 1793 trace_regulator_disable(rdev_get_name(rdev)); 1794 1795 if (rdev->ena_pin) { 1796 ret = regulator_ena_gpio_ctrl(rdev, false); 1797 if (ret < 0) 1798 return ret; 1799 rdev->ena_gpio_state = 0; 1800 1801 } else if (rdev->desc->ops->disable) { 1802 ret = rdev->desc->ops->disable(rdev); 1803 if (ret != 0) 1804 return ret; 1805 } 1806 1807 trace_regulator_disable_complete(rdev_get_name(rdev)); 1808 1809 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1810 NULL); 1811 return 0; 1812} 1813 1814/* locks held by regulator_disable() */ 1815static int _regulator_disable(struct regulator_dev *rdev) 1816{ 1817 int ret = 0; 1818 1819 if (WARN(rdev->use_count <= 0, 1820 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1821 return -EIO; 1822 1823 /* are we the last user and permitted to disable ? */ 1824 if (rdev->use_count == 1 && 1825 (rdev->constraints && !rdev->constraints->always_on)) { 1826 1827 /* we are last user */ 1828 if (_regulator_can_change_status(rdev)) { 1829 ret = _regulator_do_disable(rdev); 1830 if (ret < 0) { 1831 rdev_err(rdev, "failed to disable\n"); 1832 return ret; 1833 } 1834 } 1835 1836 rdev->use_count = 0; 1837 } else if (rdev->use_count > 1) { 1838 1839 if (rdev->constraints && 1840 (rdev->constraints->valid_ops_mask & 1841 REGULATOR_CHANGE_DRMS)) 1842 drms_uA_update(rdev); 1843 1844 rdev->use_count--; 1845 } 1846 1847 return ret; 1848} 1849 1850/** 1851 * regulator_disable - disable regulator output 1852 * @regulator: regulator source 1853 * 1854 * Disable the regulator output voltage or current. Calls to 1855 * regulator_enable() must be balanced with calls to 1856 * regulator_disable(). 1857 * 1858 * NOTE: this will only disable the regulator output if no other consumer 1859 * devices have it enabled, the regulator device supports disabling and 1860 * machine constraints permit this operation. 1861 */ 1862int regulator_disable(struct regulator *regulator) 1863{ 1864 struct regulator_dev *rdev = regulator->rdev; 1865 int ret = 0; 1866 1867 if (regulator->always_on) 1868 return 0; 1869 1870 mutex_lock(&rdev->mutex); 1871 ret = _regulator_disable(rdev); 1872 mutex_unlock(&rdev->mutex); 1873 1874 if (ret == 0 && rdev->supply) 1875 regulator_disable(rdev->supply); 1876 1877 return ret; 1878} 1879EXPORT_SYMBOL_GPL(regulator_disable); 1880 1881/* locks held by regulator_force_disable() */ 1882static int _regulator_force_disable(struct regulator_dev *rdev) 1883{ 1884 int ret = 0; 1885 1886 /* force disable */ 1887 if (rdev->desc->ops->disable) { 1888 /* ah well, who wants to live forever... */ 1889 ret = rdev->desc->ops->disable(rdev); 1890 if (ret < 0) { 1891 rdev_err(rdev, "failed to force disable\n"); 1892 return ret; 1893 } 1894 /* notify other consumers that power has been forced off */ 1895 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1896 REGULATOR_EVENT_DISABLE, NULL); 1897 } 1898 1899 return ret; 1900} 1901 1902/** 1903 * regulator_force_disable - force disable regulator output 1904 * @regulator: regulator source 1905 * 1906 * Forcibly disable the regulator output voltage or current. 1907 * NOTE: this *will* disable the regulator output even if other consumer 1908 * devices have it enabled. This should be used for situations when device 1909 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1910 */ 1911int regulator_force_disable(struct regulator *regulator) 1912{ 1913 struct regulator_dev *rdev = regulator->rdev; 1914 int ret; 1915 1916 mutex_lock(&rdev->mutex); 1917 regulator->uA_load = 0; 1918 ret = _regulator_force_disable(regulator->rdev); 1919 mutex_unlock(&rdev->mutex); 1920 1921 if (rdev->supply) 1922 while (rdev->open_count--) 1923 regulator_disable(rdev->supply); 1924 1925 return ret; 1926} 1927EXPORT_SYMBOL_GPL(regulator_force_disable); 1928 1929static void regulator_disable_work(struct work_struct *work) 1930{ 1931 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1932 disable_work.work); 1933 int count, i, ret; 1934 1935 mutex_lock(&rdev->mutex); 1936 1937 BUG_ON(!rdev->deferred_disables); 1938 1939 count = rdev->deferred_disables; 1940 rdev->deferred_disables = 0; 1941 1942 for (i = 0; i < count; i++) { 1943 ret = _regulator_disable(rdev); 1944 if (ret != 0) 1945 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1946 } 1947 1948 mutex_unlock(&rdev->mutex); 1949 1950 if (rdev->supply) { 1951 for (i = 0; i < count; i++) { 1952 ret = regulator_disable(rdev->supply); 1953 if (ret != 0) { 1954 rdev_err(rdev, 1955 "Supply disable failed: %d\n", ret); 1956 } 1957 } 1958 } 1959} 1960 1961/** 1962 * regulator_disable_deferred - disable regulator output with delay 1963 * @regulator: regulator source 1964 * @ms: miliseconds until the regulator is disabled 1965 * 1966 * Execute regulator_disable() on the regulator after a delay. This 1967 * is intended for use with devices that require some time to quiesce. 1968 * 1969 * NOTE: this will only disable the regulator output if no other consumer 1970 * devices have it enabled, the regulator device supports disabling and 1971 * machine constraints permit this operation. 1972 */ 1973int regulator_disable_deferred(struct regulator *regulator, int ms) 1974{ 1975 struct regulator_dev *rdev = regulator->rdev; 1976 int ret; 1977 1978 if (regulator->always_on) 1979 return 0; 1980 1981 if (!ms) 1982 return regulator_disable(regulator); 1983 1984 mutex_lock(&rdev->mutex); 1985 rdev->deferred_disables++; 1986 mutex_unlock(&rdev->mutex); 1987 1988 ret = queue_delayed_work(system_power_efficient_wq, 1989 &rdev->disable_work, 1990 msecs_to_jiffies(ms)); 1991 if (ret < 0) 1992 return ret; 1993 else 1994 return 0; 1995} 1996EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1997 1998static int _regulator_is_enabled(struct regulator_dev *rdev) 1999{ 2000 /* A GPIO control always takes precedence */ 2001 if (rdev->ena_pin) 2002 return rdev->ena_gpio_state; 2003 2004 /* If we don't know then assume that the regulator is always on */ 2005 if (!rdev->desc->ops->is_enabled) 2006 return 1; 2007 2008 return rdev->desc->ops->is_enabled(rdev); 2009} 2010 2011/** 2012 * regulator_is_enabled - is the regulator output enabled 2013 * @regulator: regulator source 2014 * 2015 * Returns positive if the regulator driver backing the source/client 2016 * has requested that the device be enabled, zero if it hasn't, else a 2017 * negative errno code. 2018 * 2019 * Note that the device backing this regulator handle can have multiple 2020 * users, so it might be enabled even if regulator_enable() was never 2021 * called for this particular source. 2022 */ 2023int regulator_is_enabled(struct regulator *regulator) 2024{ 2025 int ret; 2026 2027 if (regulator->always_on) 2028 return 1; 2029 2030 mutex_lock(®ulator->rdev->mutex); 2031 ret = _regulator_is_enabled(regulator->rdev); 2032 mutex_unlock(®ulator->rdev->mutex); 2033 2034 return ret; 2035} 2036EXPORT_SYMBOL_GPL(regulator_is_enabled); 2037 2038/** 2039 * regulator_can_change_voltage - check if regulator can change voltage 2040 * @regulator: regulator source 2041 * 2042 * Returns positive if the regulator driver backing the source/client 2043 * can change its voltage, false otherwise. Usefull for detecting fixed 2044 * or dummy regulators and disabling voltage change logic in the client 2045 * driver. 2046 */ 2047int regulator_can_change_voltage(struct regulator *regulator) 2048{ 2049 struct regulator_dev *rdev = regulator->rdev; 2050 2051 if (rdev->constraints && 2052 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2053 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) 2054 return 1; 2055 2056 if (rdev->desc->continuous_voltage_range && 2057 rdev->constraints->min_uV && rdev->constraints->max_uV && 2058 rdev->constraints->min_uV != rdev->constraints->max_uV) 2059 return 1; 2060 } 2061 2062 return 0; 2063} 2064EXPORT_SYMBOL_GPL(regulator_can_change_voltage); 2065 2066/** 2067 * regulator_count_voltages - count regulator_list_voltage() selectors 2068 * @regulator: regulator source 2069 * 2070 * Returns number of selectors, or negative errno. Selectors are 2071 * numbered starting at zero, and typically correspond to bitfields 2072 * in hardware registers. 2073 */ 2074int regulator_count_voltages(struct regulator *regulator) 2075{ 2076 struct regulator_dev *rdev = regulator->rdev; 2077 2078 return rdev->desc->n_voltages ? : -EINVAL; 2079} 2080EXPORT_SYMBOL_GPL(regulator_count_voltages); 2081 2082/** 2083 * regulator_list_voltage - enumerate supported voltages 2084 * @regulator: regulator source 2085 * @selector: identify voltage to list 2086 * Context: can sleep 2087 * 2088 * Returns a voltage that can be passed to @regulator_set_voltage(), 2089 * zero if this selector code can't be used on this system, or a 2090 * negative errno. 2091 */ 2092int regulator_list_voltage(struct regulator *regulator, unsigned selector) 2093{ 2094 struct regulator_dev *rdev = regulator->rdev; 2095 struct regulator_ops *ops = rdev->desc->ops; 2096 int ret; 2097 2098 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 2099 return -EINVAL; 2100 2101 mutex_lock(&rdev->mutex); 2102 ret = ops->list_voltage(rdev, selector); 2103 mutex_unlock(&rdev->mutex); 2104 2105 if (ret > 0) { 2106 if (ret < rdev->constraints->min_uV) 2107 ret = 0; 2108 else if (ret > rdev->constraints->max_uV) 2109 ret = 0; 2110 } 2111 2112 return ret; 2113} 2114EXPORT_SYMBOL_GPL(regulator_list_voltage); 2115 2116/** 2117 * regulator_get_linear_step - return the voltage step size between VSEL values 2118 * @regulator: regulator source 2119 * 2120 * Returns the voltage step size between VSEL values for linear 2121 * regulators, or return 0 if the regulator isn't a linear regulator. 2122 */ 2123unsigned int regulator_get_linear_step(struct regulator *regulator) 2124{ 2125 struct regulator_dev *rdev = regulator->rdev; 2126 2127 return rdev->desc->uV_step; 2128} 2129EXPORT_SYMBOL_GPL(regulator_get_linear_step); 2130 2131/** 2132 * regulator_is_supported_voltage - check if a voltage range can be supported 2133 * 2134 * @regulator: Regulator to check. 2135 * @min_uV: Minimum required voltage in uV. 2136 * @max_uV: Maximum required voltage in uV. 2137 * 2138 * Returns a boolean or a negative error code. 2139 */ 2140int regulator_is_supported_voltage(struct regulator *regulator, 2141 int min_uV, int max_uV) 2142{ 2143 struct regulator_dev *rdev = regulator->rdev; 2144 int i, voltages, ret; 2145 2146 /* If we can't change voltage check the current voltage */ 2147 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 2148 ret = regulator_get_voltage(regulator); 2149 if (ret >= 0) 2150 return (min_uV <= ret && ret <= max_uV); 2151 else 2152 return ret; 2153 } 2154 2155 /* Any voltage within constrains range is fine? */ 2156 if (rdev->desc->continuous_voltage_range) 2157 return min_uV >= rdev->constraints->min_uV && 2158 max_uV <= rdev->constraints->max_uV; 2159 2160 ret = regulator_count_voltages(regulator); 2161 if (ret < 0) 2162 return ret; 2163 voltages = ret; 2164 2165 for (i = 0; i < voltages; i++) { 2166 ret = regulator_list_voltage(regulator, i); 2167 2168 if (ret >= min_uV && ret <= max_uV) 2169 return 1; 2170 } 2171 2172 return 0; 2173} 2174EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 2175 2176static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2177 int min_uV, int max_uV) 2178{ 2179 int ret; 2180 int delay = 0; 2181 int best_val = 0; 2182 unsigned int selector; 2183 int old_selector = -1; 2184 2185 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2186 2187 min_uV += rdev->constraints->uV_offset; 2188 max_uV += rdev->constraints->uV_offset; 2189 2190 /* 2191 * If we can't obtain the old selector there is not enough 2192 * info to call set_voltage_time_sel(). 2193 */ 2194 if (_regulator_is_enabled(rdev) && 2195 rdev->desc->ops->set_voltage_time_sel && 2196 rdev->desc->ops->get_voltage_sel) { 2197 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2198 if (old_selector < 0) 2199 return old_selector; 2200 } 2201 2202 if (rdev->desc->ops->set_voltage) { 2203 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2204 &selector); 2205 2206 if (ret >= 0) { 2207 if (rdev->desc->ops->list_voltage) 2208 best_val = rdev->desc->ops->list_voltage(rdev, 2209 selector); 2210 else 2211 best_val = _regulator_get_voltage(rdev); 2212 } 2213 2214 } else if (rdev->desc->ops->set_voltage_sel) { 2215 if (rdev->desc->ops->map_voltage) { 2216 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2217 max_uV); 2218 } else { 2219 if (rdev->desc->ops->list_voltage == 2220 regulator_list_voltage_linear) 2221 ret = regulator_map_voltage_linear(rdev, 2222 min_uV, max_uV); 2223 else 2224 ret = regulator_map_voltage_iterate(rdev, 2225 min_uV, max_uV); 2226 } 2227 2228 if (ret >= 0) { 2229 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2230 if (min_uV <= best_val && max_uV >= best_val) { 2231 selector = ret; 2232 if (old_selector == selector) 2233 ret = 0; 2234 else 2235 ret = rdev->desc->ops->set_voltage_sel( 2236 rdev, ret); 2237 } else { 2238 ret = -EINVAL; 2239 } 2240 } 2241 } else { 2242 ret = -EINVAL; 2243 } 2244 2245 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2246 if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0 2247 && old_selector != selector) { 2248 2249 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2250 old_selector, selector); 2251 if (delay < 0) { 2252 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2253 delay); 2254 delay = 0; 2255 } 2256 2257 /* Insert any necessary delays */ 2258 if (delay >= 1000) { 2259 mdelay(delay / 1000); 2260 udelay(delay % 1000); 2261 } else if (delay) { 2262 udelay(delay); 2263 } 2264 } 2265 2266 if (ret == 0 && best_val >= 0) { 2267 unsigned long data = best_val; 2268 2269 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2270 (void *)data); 2271 } 2272 2273 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2274 2275 return ret; 2276} 2277 2278/** 2279 * regulator_set_voltage - set regulator output voltage 2280 * @regulator: regulator source 2281 * @min_uV: Minimum required voltage in uV 2282 * @max_uV: Maximum acceptable voltage in uV 2283 * 2284 * Sets a voltage regulator to the desired output voltage. This can be set 2285 * during any regulator state. IOW, regulator can be disabled or enabled. 2286 * 2287 * If the regulator is enabled then the voltage will change to the new value 2288 * immediately otherwise if the regulator is disabled the regulator will 2289 * output at the new voltage when enabled. 2290 * 2291 * NOTE: If the regulator is shared between several devices then the lowest 2292 * request voltage that meets the system constraints will be used. 2293 * Regulator system constraints must be set for this regulator before 2294 * calling this function otherwise this call will fail. 2295 */ 2296int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2297{ 2298 struct regulator_dev *rdev = regulator->rdev; 2299 int ret = 0; 2300 int old_min_uV, old_max_uV; 2301 2302 mutex_lock(&rdev->mutex); 2303 2304 /* If we're setting the same range as last time the change 2305 * should be a noop (some cpufreq implementations use the same 2306 * voltage for multiple frequencies, for example). 2307 */ 2308 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2309 goto out; 2310 2311 /* sanity check */ 2312 if (!rdev->desc->ops->set_voltage && 2313 !rdev->desc->ops->set_voltage_sel) { 2314 ret = -EINVAL; 2315 goto out; 2316 } 2317 2318 /* constraints check */ 2319 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2320 if (ret < 0) 2321 goto out; 2322 2323 /* restore original values in case of error */ 2324 old_min_uV = regulator->min_uV; 2325 old_max_uV = regulator->max_uV; 2326 regulator->min_uV = min_uV; 2327 regulator->max_uV = max_uV; 2328 2329 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2330 if (ret < 0) 2331 goto out2; 2332 2333 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2334 if (ret < 0) 2335 goto out2; 2336 2337out: 2338 mutex_unlock(&rdev->mutex); 2339 return ret; 2340out2: 2341 regulator->min_uV = old_min_uV; 2342 regulator->max_uV = old_max_uV; 2343 mutex_unlock(&rdev->mutex); 2344 return ret; 2345} 2346EXPORT_SYMBOL_GPL(regulator_set_voltage); 2347 2348/** 2349 * regulator_set_voltage_time - get raise/fall time 2350 * @regulator: regulator source 2351 * @old_uV: starting voltage in microvolts 2352 * @new_uV: target voltage in microvolts 2353 * 2354 * Provided with the starting and ending voltage, this function attempts to 2355 * calculate the time in microseconds required to rise or fall to this new 2356 * voltage. 2357 */ 2358int regulator_set_voltage_time(struct regulator *regulator, 2359 int old_uV, int new_uV) 2360{ 2361 struct regulator_dev *rdev = regulator->rdev; 2362 struct regulator_ops *ops = rdev->desc->ops; 2363 int old_sel = -1; 2364 int new_sel = -1; 2365 int voltage; 2366 int i; 2367 2368 /* Currently requires operations to do this */ 2369 if (!ops->list_voltage || !ops->set_voltage_time_sel 2370 || !rdev->desc->n_voltages) 2371 return -EINVAL; 2372 2373 for (i = 0; i < rdev->desc->n_voltages; i++) { 2374 /* We only look for exact voltage matches here */ 2375 voltage = regulator_list_voltage(regulator, i); 2376 if (voltage < 0) 2377 return -EINVAL; 2378 if (voltage == 0) 2379 continue; 2380 if (voltage == old_uV) 2381 old_sel = i; 2382 if (voltage == new_uV) 2383 new_sel = i; 2384 } 2385 2386 if (old_sel < 0 || new_sel < 0) 2387 return -EINVAL; 2388 2389 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2390} 2391EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2392 2393/** 2394 * regulator_set_voltage_time_sel - get raise/fall time 2395 * @rdev: regulator source device 2396 * @old_selector: selector for starting voltage 2397 * @new_selector: selector for target voltage 2398 * 2399 * Provided with the starting and target voltage selectors, this function 2400 * returns time in microseconds required to rise or fall to this new voltage 2401 * 2402 * Drivers providing ramp_delay in regulation_constraints can use this as their 2403 * set_voltage_time_sel() operation. 2404 */ 2405int regulator_set_voltage_time_sel(struct regulator_dev *rdev, 2406 unsigned int old_selector, 2407 unsigned int new_selector) 2408{ 2409 unsigned int ramp_delay = 0; 2410 int old_volt, new_volt; 2411 2412 if (rdev->constraints->ramp_delay) 2413 ramp_delay = rdev->constraints->ramp_delay; 2414 else if (rdev->desc->ramp_delay) 2415 ramp_delay = rdev->desc->ramp_delay; 2416 2417 if (ramp_delay == 0) { 2418 rdev_warn(rdev, "ramp_delay not set\n"); 2419 return 0; 2420 } 2421 2422 /* sanity check */ 2423 if (!rdev->desc->ops->list_voltage) 2424 return -EINVAL; 2425 2426 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector); 2427 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector); 2428 2429 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay); 2430} 2431EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel); 2432 2433/** 2434 * regulator_sync_voltage - re-apply last regulator output voltage 2435 * @regulator: regulator source 2436 * 2437 * Re-apply the last configured voltage. This is intended to be used 2438 * where some external control source the consumer is cooperating with 2439 * has caused the configured voltage to change. 2440 */ 2441int regulator_sync_voltage(struct regulator *regulator) 2442{ 2443 struct regulator_dev *rdev = regulator->rdev; 2444 int ret, min_uV, max_uV; 2445 2446 mutex_lock(&rdev->mutex); 2447 2448 if (!rdev->desc->ops->set_voltage && 2449 !rdev->desc->ops->set_voltage_sel) { 2450 ret = -EINVAL; 2451 goto out; 2452 } 2453 2454 /* This is only going to work if we've had a voltage configured. */ 2455 if (!regulator->min_uV && !regulator->max_uV) { 2456 ret = -EINVAL; 2457 goto out; 2458 } 2459 2460 min_uV = regulator->min_uV; 2461 max_uV = regulator->max_uV; 2462 2463 /* This should be a paranoia check... */ 2464 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2465 if (ret < 0) 2466 goto out; 2467 2468 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2469 if (ret < 0) 2470 goto out; 2471 2472 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2473 2474out: 2475 mutex_unlock(&rdev->mutex); 2476 return ret; 2477} 2478EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2479 2480static int _regulator_get_voltage(struct regulator_dev *rdev) 2481{ 2482 int sel, ret; 2483 2484 if (rdev->desc->ops->get_voltage_sel) { 2485 sel = rdev->desc->ops->get_voltage_sel(rdev); 2486 if (sel < 0) 2487 return sel; 2488 ret = rdev->desc->ops->list_voltage(rdev, sel); 2489 } else if (rdev->desc->ops->get_voltage) { 2490 ret = rdev->desc->ops->get_voltage(rdev); 2491 } else if (rdev->desc->ops->list_voltage) { 2492 ret = rdev->desc->ops->list_voltage(rdev, 0); 2493 } else { 2494 return -EINVAL; 2495 } 2496 2497 if (ret < 0) 2498 return ret; 2499 return ret - rdev->constraints->uV_offset; 2500} 2501 2502/** 2503 * regulator_get_voltage - get regulator output voltage 2504 * @regulator: regulator source 2505 * 2506 * This returns the current regulator voltage in uV. 2507 * 2508 * NOTE: If the regulator is disabled it will return the voltage value. This 2509 * function should not be used to determine regulator state. 2510 */ 2511int regulator_get_voltage(struct regulator *regulator) 2512{ 2513 int ret; 2514 2515 mutex_lock(®ulator->rdev->mutex); 2516 2517 ret = _regulator_get_voltage(regulator->rdev); 2518 2519 mutex_unlock(®ulator->rdev->mutex); 2520 2521 return ret; 2522} 2523EXPORT_SYMBOL_GPL(regulator_get_voltage); 2524 2525/** 2526 * regulator_set_current_limit - set regulator output current limit 2527 * @regulator: regulator source 2528 * @min_uA: Minimum supported current in uA 2529 * @max_uA: Maximum supported current in uA 2530 * 2531 * Sets current sink to the desired output current. This can be set during 2532 * any regulator state. IOW, regulator can be disabled or enabled. 2533 * 2534 * If the regulator is enabled then the current will change to the new value 2535 * immediately otherwise if the regulator is disabled the regulator will 2536 * output at the new current when enabled. 2537 * 2538 * NOTE: Regulator system constraints must be set for this regulator before 2539 * calling this function otherwise this call will fail. 2540 */ 2541int regulator_set_current_limit(struct regulator *regulator, 2542 int min_uA, int max_uA) 2543{ 2544 struct regulator_dev *rdev = regulator->rdev; 2545 int ret; 2546 2547 mutex_lock(&rdev->mutex); 2548 2549 /* sanity check */ 2550 if (!rdev->desc->ops->set_current_limit) { 2551 ret = -EINVAL; 2552 goto out; 2553 } 2554 2555 /* constraints check */ 2556 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2557 if (ret < 0) 2558 goto out; 2559 2560 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2561out: 2562 mutex_unlock(&rdev->mutex); 2563 return ret; 2564} 2565EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2566 2567static int _regulator_get_current_limit(struct regulator_dev *rdev) 2568{ 2569 int ret; 2570 2571 mutex_lock(&rdev->mutex); 2572 2573 /* sanity check */ 2574 if (!rdev->desc->ops->get_current_limit) { 2575 ret = -EINVAL; 2576 goto out; 2577 } 2578 2579 ret = rdev->desc->ops->get_current_limit(rdev); 2580out: 2581 mutex_unlock(&rdev->mutex); 2582 return ret; 2583} 2584 2585/** 2586 * regulator_get_current_limit - get regulator output current 2587 * @regulator: regulator source 2588 * 2589 * This returns the current supplied by the specified current sink in uA. 2590 * 2591 * NOTE: If the regulator is disabled it will return the current value. This 2592 * function should not be used to determine regulator state. 2593 */ 2594int regulator_get_current_limit(struct regulator *regulator) 2595{ 2596 return _regulator_get_current_limit(regulator->rdev); 2597} 2598EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2599 2600/** 2601 * regulator_set_mode - set regulator operating mode 2602 * @regulator: regulator source 2603 * @mode: operating mode - one of the REGULATOR_MODE constants 2604 * 2605 * Set regulator operating mode to increase regulator efficiency or improve 2606 * regulation performance. 2607 * 2608 * NOTE: Regulator system constraints must be set for this regulator before 2609 * calling this function otherwise this call will fail. 2610 */ 2611int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2612{ 2613 struct regulator_dev *rdev = regulator->rdev; 2614 int ret; 2615 int regulator_curr_mode; 2616 2617 mutex_lock(&rdev->mutex); 2618 2619 /* sanity check */ 2620 if (!rdev->desc->ops->set_mode) { 2621 ret = -EINVAL; 2622 goto out; 2623 } 2624 2625 /* return if the same mode is requested */ 2626 if (rdev->desc->ops->get_mode) { 2627 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2628 if (regulator_curr_mode == mode) { 2629 ret = 0; 2630 goto out; 2631 } 2632 } 2633 2634 /* constraints check */ 2635 ret = regulator_mode_constrain(rdev, &mode); 2636 if (ret < 0) 2637 goto out; 2638 2639 ret = rdev->desc->ops->set_mode(rdev, mode); 2640out: 2641 mutex_unlock(&rdev->mutex); 2642 return ret; 2643} 2644EXPORT_SYMBOL_GPL(regulator_set_mode); 2645 2646static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2647{ 2648 int ret; 2649 2650 mutex_lock(&rdev->mutex); 2651 2652 /* sanity check */ 2653 if (!rdev->desc->ops->get_mode) { 2654 ret = -EINVAL; 2655 goto out; 2656 } 2657 2658 ret = rdev->desc->ops->get_mode(rdev); 2659out: 2660 mutex_unlock(&rdev->mutex); 2661 return ret; 2662} 2663 2664/** 2665 * regulator_get_mode - get regulator operating mode 2666 * @regulator: regulator source 2667 * 2668 * Get the current regulator operating mode. 2669 */ 2670unsigned int regulator_get_mode(struct regulator *regulator) 2671{ 2672 return _regulator_get_mode(regulator->rdev); 2673} 2674EXPORT_SYMBOL_GPL(regulator_get_mode); 2675 2676/** 2677 * regulator_set_optimum_mode - set regulator optimum operating mode 2678 * @regulator: regulator source 2679 * @uA_load: load current 2680 * 2681 * Notifies the regulator core of a new device load. This is then used by 2682 * DRMS (if enabled by constraints) to set the most efficient regulator 2683 * operating mode for the new regulator loading. 2684 * 2685 * Consumer devices notify their supply regulator of the maximum power 2686 * they will require (can be taken from device datasheet in the power 2687 * consumption tables) when they change operational status and hence power 2688 * state. Examples of operational state changes that can affect power 2689 * consumption are :- 2690 * 2691 * o Device is opened / closed. 2692 * o Device I/O is about to begin or has just finished. 2693 * o Device is idling in between work. 2694 * 2695 * This information is also exported via sysfs to userspace. 2696 * 2697 * DRMS will sum the total requested load on the regulator and change 2698 * to the most efficient operating mode if platform constraints allow. 2699 * 2700 * Returns the new regulator mode or error. 2701 */ 2702int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2703{ 2704 struct regulator_dev *rdev = regulator->rdev; 2705 struct regulator *consumer; 2706 int ret, output_uV, input_uV = 0, total_uA_load = 0; 2707 unsigned int mode; 2708 2709 if (rdev->supply) 2710 input_uV = regulator_get_voltage(rdev->supply); 2711 2712 mutex_lock(&rdev->mutex); 2713 2714 /* 2715 * first check to see if we can set modes at all, otherwise just 2716 * tell the consumer everything is OK. 2717 */ 2718 regulator->uA_load = uA_load; 2719 ret = regulator_check_drms(rdev); 2720 if (ret < 0) { 2721 ret = 0; 2722 goto out; 2723 } 2724 2725 if (!rdev->desc->ops->get_optimum_mode) 2726 goto out; 2727 2728 /* 2729 * we can actually do this so any errors are indicators of 2730 * potential real failure. 2731 */ 2732 ret = -EINVAL; 2733 2734 if (!rdev->desc->ops->set_mode) 2735 goto out; 2736 2737 /* get output voltage */ 2738 output_uV = _regulator_get_voltage(rdev); 2739 if (output_uV <= 0) { 2740 rdev_err(rdev, "invalid output voltage found\n"); 2741 goto out; 2742 } 2743 2744 /* No supply? Use constraint voltage */ 2745 if (input_uV <= 0) 2746 input_uV = rdev->constraints->input_uV; 2747 if (input_uV <= 0) { 2748 rdev_err(rdev, "invalid input voltage found\n"); 2749 goto out; 2750 } 2751 2752 /* calc total requested load for this regulator */ 2753 list_for_each_entry(consumer, &rdev->consumer_list, list) 2754 total_uA_load += consumer->uA_load; 2755 2756 mode = rdev->desc->ops->get_optimum_mode(rdev, 2757 input_uV, output_uV, 2758 total_uA_load); 2759 ret = regulator_mode_constrain(rdev, &mode); 2760 if (ret < 0) { 2761 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2762 total_uA_load, input_uV, output_uV); 2763 goto out; 2764 } 2765 2766 ret = rdev->desc->ops->set_mode(rdev, mode); 2767 if (ret < 0) { 2768 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2769 goto out; 2770 } 2771 ret = mode; 2772out: 2773 mutex_unlock(&rdev->mutex); 2774 return ret; 2775} 2776EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2777 2778/** 2779 * regulator_allow_bypass - allow the regulator to go into bypass mode 2780 * 2781 * @regulator: Regulator to configure 2782 * @enable: enable or disable bypass mode 2783 * 2784 * Allow the regulator to go into bypass mode if all other consumers 2785 * for the regulator also enable bypass mode and the machine 2786 * constraints allow this. Bypass mode means that the regulator is 2787 * simply passing the input directly to the output with no regulation. 2788 */ 2789int regulator_allow_bypass(struct regulator *regulator, bool enable) 2790{ 2791 struct regulator_dev *rdev = regulator->rdev; 2792 int ret = 0; 2793 2794 if (!rdev->desc->ops->set_bypass) 2795 return 0; 2796 2797 if (rdev->constraints && 2798 !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS)) 2799 return 0; 2800 2801 mutex_lock(&rdev->mutex); 2802 2803 if (enable && !regulator->bypass) { 2804 rdev->bypass_count++; 2805 2806 if (rdev->bypass_count == rdev->open_count) { 2807 ret = rdev->desc->ops->set_bypass(rdev, enable); 2808 if (ret != 0) 2809 rdev->bypass_count--; 2810 } 2811 2812 } else if (!enable && regulator->bypass) { 2813 rdev->bypass_count--; 2814 2815 if (rdev->bypass_count != rdev->open_count) { 2816 ret = rdev->desc->ops->set_bypass(rdev, enable); 2817 if (ret != 0) 2818 rdev->bypass_count++; 2819 } 2820 } 2821 2822 if (ret == 0) 2823 regulator->bypass = enable; 2824 2825 mutex_unlock(&rdev->mutex); 2826 2827 return ret; 2828} 2829EXPORT_SYMBOL_GPL(regulator_allow_bypass); 2830 2831/** 2832 * regulator_register_notifier - register regulator event notifier 2833 * @regulator: regulator source 2834 * @nb: notifier block 2835 * 2836 * Register notifier block to receive regulator events. 2837 */ 2838int regulator_register_notifier(struct regulator *regulator, 2839 struct notifier_block *nb) 2840{ 2841 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2842 nb); 2843} 2844EXPORT_SYMBOL_GPL(regulator_register_notifier); 2845 2846/** 2847 * regulator_unregister_notifier - unregister regulator event notifier 2848 * @regulator: regulator source 2849 * @nb: notifier block 2850 * 2851 * Unregister regulator event notifier block. 2852 */ 2853int regulator_unregister_notifier(struct regulator *regulator, 2854 struct notifier_block *nb) 2855{ 2856 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2857 nb); 2858} 2859EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2860 2861/* notify regulator consumers and downstream regulator consumers. 2862 * Note mutex must be held by caller. 2863 */ 2864static void _notifier_call_chain(struct regulator_dev *rdev, 2865 unsigned long event, void *data) 2866{ 2867 /* call rdev chain first */ 2868 blocking_notifier_call_chain(&rdev->notifier, event, data); 2869} 2870 2871/** 2872 * regulator_bulk_get - get multiple regulator consumers 2873 * 2874 * @dev: Device to supply 2875 * @num_consumers: Number of consumers to register 2876 * @consumers: Configuration of consumers; clients are stored here. 2877 * 2878 * @return 0 on success, an errno on failure. 2879 * 2880 * This helper function allows drivers to get several regulator 2881 * consumers in one operation. If any of the regulators cannot be 2882 * acquired then any regulators that were allocated will be freed 2883 * before returning to the caller. 2884 */ 2885int regulator_bulk_get(struct device *dev, int num_consumers, 2886 struct regulator_bulk_data *consumers) 2887{ 2888 int i; 2889 int ret; 2890 2891 for (i = 0; i < num_consumers; i++) 2892 consumers[i].consumer = NULL; 2893 2894 for (i = 0; i < num_consumers; i++) { 2895 consumers[i].consumer = regulator_get(dev, 2896 consumers[i].supply); 2897 if (IS_ERR(consumers[i].consumer)) { 2898 ret = PTR_ERR(consumers[i].consumer); 2899 dev_err(dev, "Failed to get supply '%s': %d\n", 2900 consumers[i].supply, ret); 2901 consumers[i].consumer = NULL; 2902 goto err; 2903 } 2904 } 2905 2906 return 0; 2907 2908err: 2909 while (--i >= 0) 2910 regulator_put(consumers[i].consumer); 2911 2912 return ret; 2913} 2914EXPORT_SYMBOL_GPL(regulator_bulk_get); 2915 2916/** 2917 * devm_regulator_bulk_get - managed get multiple regulator consumers 2918 * 2919 * @dev: Device to supply 2920 * @num_consumers: Number of consumers to register 2921 * @consumers: Configuration of consumers; clients are stored here. 2922 * 2923 * @return 0 on success, an errno on failure. 2924 * 2925 * This helper function allows drivers to get several regulator 2926 * consumers in one operation with management, the regulators will 2927 * automatically be freed when the device is unbound. If any of the 2928 * regulators cannot be acquired then any regulators that were 2929 * allocated will be freed before returning to the caller. 2930 */ 2931int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2932 struct regulator_bulk_data *consumers) 2933{ 2934 int i; 2935 int ret; 2936 2937 for (i = 0; i < num_consumers; i++) 2938 consumers[i].consumer = NULL; 2939 2940 for (i = 0; i < num_consumers; i++) { 2941 consumers[i].consumer = devm_regulator_get(dev, 2942 consumers[i].supply); 2943 if (IS_ERR(consumers[i].consumer)) { 2944 ret = PTR_ERR(consumers[i].consumer); 2945 dev_err(dev, "Failed to get supply '%s': %d\n", 2946 consumers[i].supply, ret); 2947 consumers[i].consumer = NULL; 2948 goto err; 2949 } 2950 } 2951 2952 return 0; 2953 2954err: 2955 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2956 devm_regulator_put(consumers[i].consumer); 2957 2958 return ret; 2959} 2960EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2961 2962static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2963{ 2964 struct regulator_bulk_data *bulk = data; 2965 2966 bulk->ret = regulator_enable(bulk->consumer); 2967} 2968 2969/** 2970 * regulator_bulk_enable - enable multiple regulator consumers 2971 * 2972 * @num_consumers: Number of consumers 2973 * @consumers: Consumer data; clients are stored here. 2974 * @return 0 on success, an errno on failure 2975 * 2976 * This convenience API allows consumers to enable multiple regulator 2977 * clients in a single API call. If any consumers cannot be enabled 2978 * then any others that were enabled will be disabled again prior to 2979 * return. 2980 */ 2981int regulator_bulk_enable(int num_consumers, 2982 struct regulator_bulk_data *consumers) 2983{ 2984 ASYNC_DOMAIN_EXCLUSIVE(async_domain); 2985 int i; 2986 int ret = 0; 2987 2988 for (i = 0; i < num_consumers; i++) { 2989 if (consumers[i].consumer->always_on) 2990 consumers[i].ret = 0; 2991 else 2992 async_schedule_domain(regulator_bulk_enable_async, 2993 &consumers[i], &async_domain); 2994 } 2995 2996 async_synchronize_full_domain(&async_domain); 2997 2998 /* If any consumer failed we need to unwind any that succeeded */ 2999 for (i = 0; i < num_consumers; i++) { 3000 if (consumers[i].ret != 0) { 3001 ret = consumers[i].ret; 3002 goto err; 3003 } 3004 } 3005 3006 return 0; 3007 3008err: 3009 for (i = 0; i < num_consumers; i++) { 3010 if (consumers[i].ret < 0) 3011 pr_err("Failed to enable %s: %d\n", consumers[i].supply, 3012 consumers[i].ret); 3013 else 3014 regulator_disable(consumers[i].consumer); 3015 } 3016 3017 return ret; 3018} 3019EXPORT_SYMBOL_GPL(regulator_bulk_enable); 3020 3021/** 3022 * regulator_bulk_disable - disable multiple regulator consumers 3023 * 3024 * @num_consumers: Number of consumers 3025 * @consumers: Consumer data; clients are stored here. 3026 * @return 0 on success, an errno on failure 3027 * 3028 * This convenience API allows consumers to disable multiple regulator 3029 * clients in a single API call. If any consumers cannot be disabled 3030 * then any others that were disabled will be enabled again prior to 3031 * return. 3032 */ 3033int regulator_bulk_disable(int num_consumers, 3034 struct regulator_bulk_data *consumers) 3035{ 3036 int i; 3037 int ret, r; 3038 3039 for (i = num_consumers - 1; i >= 0; --i) { 3040 ret = regulator_disable(consumers[i].consumer); 3041 if (ret != 0) 3042 goto err; 3043 } 3044 3045 return 0; 3046 3047err: 3048 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 3049 for (++i; i < num_consumers; ++i) { 3050 r = regulator_enable(consumers[i].consumer); 3051 if (r != 0) 3052 pr_err("Failed to reename %s: %d\n", 3053 consumers[i].supply, r); 3054 } 3055 3056 return ret; 3057} 3058EXPORT_SYMBOL_GPL(regulator_bulk_disable); 3059 3060/** 3061 * regulator_bulk_force_disable - force disable multiple regulator consumers 3062 * 3063 * @num_consumers: Number of consumers 3064 * @consumers: Consumer data; clients are stored here. 3065 * @return 0 on success, an errno on failure 3066 * 3067 * This convenience API allows consumers to forcibly disable multiple regulator 3068 * clients in a single API call. 3069 * NOTE: This should be used for situations when device damage will 3070 * likely occur if the regulators are not disabled (e.g. over temp). 3071 * Although regulator_force_disable function call for some consumers can 3072 * return error numbers, the function is called for all consumers. 3073 */ 3074int regulator_bulk_force_disable(int num_consumers, 3075 struct regulator_bulk_data *consumers) 3076{ 3077 int i; 3078 int ret; 3079 3080 for (i = 0; i < num_consumers; i++) 3081 consumers[i].ret = 3082 regulator_force_disable(consumers[i].consumer); 3083 3084 for (i = 0; i < num_consumers; i++) { 3085 if (consumers[i].ret != 0) { 3086 ret = consumers[i].ret; 3087 goto out; 3088 } 3089 } 3090 3091 return 0; 3092out: 3093 return ret; 3094} 3095EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 3096 3097/** 3098 * regulator_bulk_free - free multiple regulator consumers 3099 * 3100 * @num_consumers: Number of consumers 3101 * @consumers: Consumer data; clients are stored here. 3102 * 3103 * This convenience API allows consumers to free multiple regulator 3104 * clients in a single API call. 3105 */ 3106void regulator_bulk_free(int num_consumers, 3107 struct regulator_bulk_data *consumers) 3108{ 3109 int i; 3110 3111 for (i = 0; i < num_consumers; i++) { 3112 regulator_put(consumers[i].consumer); 3113 consumers[i].consumer = NULL; 3114 } 3115} 3116EXPORT_SYMBOL_GPL(regulator_bulk_free); 3117 3118/** 3119 * regulator_notifier_call_chain - call regulator event notifier 3120 * @rdev: regulator source 3121 * @event: notifier block 3122 * @data: callback-specific data. 3123 * 3124 * Called by regulator drivers to notify clients a regulator event has 3125 * occurred. We also notify regulator clients downstream. 3126 * Note lock must be held by caller. 3127 */ 3128int regulator_notifier_call_chain(struct regulator_dev *rdev, 3129 unsigned long event, void *data) 3130{ 3131 _notifier_call_chain(rdev, event, data); 3132 return NOTIFY_DONE; 3133 3134} 3135EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 3136 3137/** 3138 * regulator_mode_to_status - convert a regulator mode into a status 3139 * 3140 * @mode: Mode to convert 3141 * 3142 * Convert a regulator mode into a status. 3143 */ 3144int regulator_mode_to_status(unsigned int mode) 3145{ 3146 switch (mode) { 3147 case REGULATOR_MODE_FAST: 3148 return REGULATOR_STATUS_FAST; 3149 case REGULATOR_MODE_NORMAL: 3150 return REGULATOR_STATUS_NORMAL; 3151 case REGULATOR_MODE_IDLE: 3152 return REGULATOR_STATUS_IDLE; 3153 case REGULATOR_MODE_STANDBY: 3154 return REGULATOR_STATUS_STANDBY; 3155 default: 3156 return REGULATOR_STATUS_UNDEFINED; 3157 } 3158} 3159EXPORT_SYMBOL_GPL(regulator_mode_to_status); 3160 3161/* 3162 * To avoid cluttering sysfs (and memory) with useless state, only 3163 * create attributes that can be meaningfully displayed. 3164 */ 3165static int add_regulator_attributes(struct regulator_dev *rdev) 3166{ 3167 struct device *dev = &rdev->dev; 3168 struct regulator_ops *ops = rdev->desc->ops; 3169 int status = 0; 3170 3171 /* some attributes need specific methods to be displayed */ 3172 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 3173 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || 3174 (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) { 3175 status = device_create_file(dev, &dev_attr_microvolts); 3176 if (status < 0) 3177 return status; 3178 } 3179 if (ops->get_current_limit) { 3180 status = device_create_file(dev, &dev_attr_microamps); 3181 if (status < 0) 3182 return status; 3183 } 3184 if (ops->get_mode) { 3185 status = device_create_file(dev, &dev_attr_opmode); 3186 if (status < 0) 3187 return status; 3188 } 3189 if (rdev->ena_pin || ops->is_enabled) { 3190 status = device_create_file(dev, &dev_attr_state); 3191 if (status < 0) 3192 return status; 3193 } 3194 if (ops->get_status) { 3195 status = device_create_file(dev, &dev_attr_status); 3196 if (status < 0) 3197 return status; 3198 } 3199 if (ops->get_bypass) { 3200 status = device_create_file(dev, &dev_attr_bypass); 3201 if (status < 0) 3202 return status; 3203 } 3204 3205 /* some attributes are type-specific */ 3206 if (rdev->desc->type == REGULATOR_CURRENT) { 3207 status = device_create_file(dev, &dev_attr_requested_microamps); 3208 if (status < 0) 3209 return status; 3210 } 3211 3212 /* all the other attributes exist to support constraints; 3213 * don't show them if there are no constraints, or if the 3214 * relevant supporting methods are missing. 3215 */ 3216 if (!rdev->constraints) 3217 return status; 3218 3219 /* constraints need specific supporting methods */ 3220 if (ops->set_voltage || ops->set_voltage_sel) { 3221 status = device_create_file(dev, &dev_attr_min_microvolts); 3222 if (status < 0) 3223 return status; 3224 status = device_create_file(dev, &dev_attr_max_microvolts); 3225 if (status < 0) 3226 return status; 3227 } 3228 if (ops->set_current_limit) { 3229 status = device_create_file(dev, &dev_attr_min_microamps); 3230 if (status < 0) 3231 return status; 3232 status = device_create_file(dev, &dev_attr_max_microamps); 3233 if (status < 0) 3234 return status; 3235 } 3236 3237 status = device_create_file(dev, &dev_attr_suspend_standby_state); 3238 if (status < 0) 3239 return status; 3240 status = device_create_file(dev, &dev_attr_suspend_mem_state); 3241 if (status < 0) 3242 return status; 3243 status = device_create_file(dev, &dev_attr_suspend_disk_state); 3244 if (status < 0) 3245 return status; 3246 3247 if (ops->set_suspend_voltage) { 3248 status = device_create_file(dev, 3249 &dev_attr_suspend_standby_microvolts); 3250 if (status < 0) 3251 return status; 3252 status = device_create_file(dev, 3253 &dev_attr_suspend_mem_microvolts); 3254 if (status < 0) 3255 return status; 3256 status = device_create_file(dev, 3257 &dev_attr_suspend_disk_microvolts); 3258 if (status < 0) 3259 return status; 3260 } 3261 3262 if (ops->set_suspend_mode) { 3263 status = device_create_file(dev, 3264 &dev_attr_suspend_standby_mode); 3265 if (status < 0) 3266 return status; 3267 status = device_create_file(dev, 3268 &dev_attr_suspend_mem_mode); 3269 if (status < 0) 3270 return status; 3271 status = device_create_file(dev, 3272 &dev_attr_suspend_disk_mode); 3273 if (status < 0) 3274 return status; 3275 } 3276 3277 return status; 3278} 3279 3280static void rdev_init_debugfs(struct regulator_dev *rdev) 3281{ 3282 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3283 if (!rdev->debugfs) { 3284 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3285 return; 3286 } 3287 3288 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3289 &rdev->use_count); 3290 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3291 &rdev->open_count); 3292 debugfs_create_u32("bypass_count", 0444, rdev->debugfs, 3293 &rdev->bypass_count); 3294} 3295 3296/** 3297 * regulator_register - register regulator 3298 * @regulator_desc: regulator to register 3299 * @config: runtime configuration for regulator 3300 * 3301 * Called by regulator drivers to register a regulator. 3302 * Returns a valid pointer to struct regulator_dev on success 3303 * or an ERR_PTR() on error. 3304 */ 3305struct regulator_dev * 3306regulator_register(const struct regulator_desc *regulator_desc, 3307 const struct regulator_config *config) 3308{ 3309 const struct regulation_constraints *constraints = NULL; 3310 const struct regulator_init_data *init_data; 3311 static atomic_t regulator_no = ATOMIC_INIT(0); 3312 struct regulator_dev *rdev; 3313 struct device *dev; 3314 int ret, i; 3315 const char *supply = NULL; 3316 3317 if (regulator_desc == NULL || config == NULL) 3318 return ERR_PTR(-EINVAL); 3319 3320 dev = config->dev; 3321 WARN_ON(!dev); 3322 3323 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3324 return ERR_PTR(-EINVAL); 3325 3326 if (regulator_desc->type != REGULATOR_VOLTAGE && 3327 regulator_desc->type != REGULATOR_CURRENT) 3328 return ERR_PTR(-EINVAL); 3329 3330 /* Only one of each should be implemented */ 3331 WARN_ON(regulator_desc->ops->get_voltage && 3332 regulator_desc->ops->get_voltage_sel); 3333 WARN_ON(regulator_desc->ops->set_voltage && 3334 regulator_desc->ops->set_voltage_sel); 3335 3336 /* If we're using selectors we must implement list_voltage. */ 3337 if (regulator_desc->ops->get_voltage_sel && 3338 !regulator_desc->ops->list_voltage) { 3339 return ERR_PTR(-EINVAL); 3340 } 3341 if (regulator_desc->ops->set_voltage_sel && 3342 !regulator_desc->ops->list_voltage) { 3343 return ERR_PTR(-EINVAL); 3344 } 3345 3346 init_data = config->init_data; 3347 3348 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3349 if (rdev == NULL) 3350 return ERR_PTR(-ENOMEM); 3351 3352 mutex_lock(®ulator_list_mutex); 3353 3354 mutex_init(&rdev->mutex); 3355 rdev->reg_data = config->driver_data; 3356 rdev->owner = regulator_desc->owner; 3357 rdev->desc = regulator_desc; 3358 if (config->regmap) 3359 rdev->regmap = config->regmap; 3360 else if (dev_get_regmap(dev, NULL)) 3361 rdev->regmap = dev_get_regmap(dev, NULL); 3362 else if (dev->parent) 3363 rdev->regmap = dev_get_regmap(dev->parent, NULL); 3364 INIT_LIST_HEAD(&rdev->consumer_list); 3365 INIT_LIST_HEAD(&rdev->list); 3366 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3367 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3368 3369 /* preform any regulator specific init */ 3370 if (init_data && init_data->regulator_init) { 3371 ret = init_data->regulator_init(rdev->reg_data); 3372 if (ret < 0) 3373 goto clean; 3374 } 3375 3376 /* register with sysfs */ 3377 rdev->dev.class = ®ulator_class; 3378 rdev->dev.of_node = config->of_node; 3379 rdev->dev.parent = dev; 3380 dev_set_name(&rdev->dev, "regulator.%d", 3381 atomic_inc_return(®ulator_no) - 1); 3382 ret = device_register(&rdev->dev); 3383 if (ret != 0) { 3384 put_device(&rdev->dev); 3385 goto clean; 3386 } 3387 3388 dev_set_drvdata(&rdev->dev, rdev); 3389 3390 if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { 3391 ret = regulator_ena_gpio_request(rdev, config); 3392 if (ret != 0) { 3393 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", 3394 config->ena_gpio, ret); 3395 goto wash; 3396 } 3397 3398 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) 3399 rdev->ena_gpio_state = 1; 3400 3401 if (config->ena_gpio_invert) 3402 rdev->ena_gpio_state = !rdev->ena_gpio_state; 3403 } 3404 3405 /* set regulator constraints */ 3406 if (init_data) 3407 constraints = &init_data->constraints; 3408 3409 ret = set_machine_constraints(rdev, constraints); 3410 if (ret < 0) 3411 goto scrub; 3412 3413 /* add attributes supported by this regulator */ 3414 ret = add_regulator_attributes(rdev); 3415 if (ret < 0) 3416 goto scrub; 3417 3418 if (init_data && init_data->supply_regulator) 3419 supply = init_data->supply_regulator; 3420 else if (regulator_desc->supply_name) 3421 supply = regulator_desc->supply_name; 3422 3423 if (supply) { 3424 struct regulator_dev *r; 3425 3426 r = regulator_dev_lookup(dev, supply, &ret); 3427 3428 if (ret == -ENODEV) { 3429 /* 3430 * No supply was specified for this regulator and 3431 * there will never be one. 3432 */ 3433 ret = 0; 3434 goto add_dev; 3435 } else if (!r) { 3436 dev_err(dev, "Failed to find supply %s\n", supply); 3437 ret = -EPROBE_DEFER; 3438 goto scrub; 3439 } 3440 3441 ret = set_supply(rdev, r); 3442 if (ret < 0) 3443 goto scrub; 3444 3445 /* Enable supply if rail is enabled */ 3446 if (_regulator_is_enabled(rdev)) { 3447 ret = regulator_enable(rdev->supply); 3448 if (ret < 0) 3449 goto scrub; 3450 } 3451 } 3452 3453add_dev: 3454 /* add consumers devices */ 3455 if (init_data) { 3456 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3457 ret = set_consumer_device_supply(rdev, 3458 init_data->consumer_supplies[i].dev_name, 3459 init_data->consumer_supplies[i].supply); 3460 if (ret < 0) { 3461 dev_err(dev, "Failed to set supply %s\n", 3462 init_data->consumer_supplies[i].supply); 3463 goto unset_supplies; 3464 } 3465 } 3466 } 3467 3468 list_add(&rdev->list, ®ulator_list); 3469 3470 rdev_init_debugfs(rdev); 3471out: 3472 mutex_unlock(®ulator_list_mutex); 3473 return rdev; 3474 3475unset_supplies: 3476 unset_regulator_supplies(rdev); 3477 3478scrub: 3479 if (rdev->supply) 3480 _regulator_put(rdev->supply); 3481 regulator_ena_gpio_free(rdev); 3482 kfree(rdev->constraints); 3483wash: 3484 device_unregister(&rdev->dev); 3485 /* device core frees rdev */ 3486 rdev = ERR_PTR(ret); 3487 goto out; 3488 3489clean: 3490 kfree(rdev); 3491 rdev = ERR_PTR(ret); 3492 goto out; 3493} 3494EXPORT_SYMBOL_GPL(regulator_register); 3495 3496/** 3497 * regulator_unregister - unregister regulator 3498 * @rdev: regulator to unregister 3499 * 3500 * Called by regulator drivers to unregister a regulator. 3501 */ 3502void regulator_unregister(struct regulator_dev *rdev) 3503{ 3504 if (rdev == NULL) 3505 return; 3506 3507 if (rdev->supply) { 3508 while (rdev->use_count--) 3509 regulator_disable(rdev->supply); 3510 regulator_put(rdev->supply); 3511 } 3512 mutex_lock(®ulator_list_mutex); 3513 debugfs_remove_recursive(rdev->debugfs); 3514 flush_work(&rdev->disable_work.work); 3515 WARN_ON(rdev->open_count); 3516 unset_regulator_supplies(rdev); 3517 list_del(&rdev->list); 3518 kfree(rdev->constraints); 3519 regulator_ena_gpio_free(rdev); 3520 device_unregister(&rdev->dev); 3521 mutex_unlock(®ulator_list_mutex); 3522} 3523EXPORT_SYMBOL_GPL(regulator_unregister); 3524 3525/** 3526 * regulator_suspend_prepare - prepare regulators for system wide suspend 3527 * @state: system suspend state 3528 * 3529 * Configure each regulator with it's suspend operating parameters for state. 3530 * This will usually be called by machine suspend code prior to supending. 3531 */ 3532int regulator_suspend_prepare(suspend_state_t state) 3533{ 3534 struct regulator_dev *rdev; 3535 int ret = 0; 3536 3537 /* ON is handled by regulator active state */ 3538 if (state == PM_SUSPEND_ON) 3539 return -EINVAL; 3540 3541 mutex_lock(®ulator_list_mutex); 3542 list_for_each_entry(rdev, ®ulator_list, list) { 3543 3544 mutex_lock(&rdev->mutex); 3545 ret = suspend_prepare(rdev, state); 3546 mutex_unlock(&rdev->mutex); 3547 3548 if (ret < 0) { 3549 rdev_err(rdev, "failed to prepare\n"); 3550 goto out; 3551 } 3552 } 3553out: 3554 mutex_unlock(®ulator_list_mutex); 3555 return ret; 3556} 3557EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3558 3559/** 3560 * regulator_suspend_finish - resume regulators from system wide suspend 3561 * 3562 * Turn on regulators that might be turned off by regulator_suspend_prepare 3563 * and that should be turned on according to the regulators properties. 3564 */ 3565int regulator_suspend_finish(void) 3566{ 3567 struct regulator_dev *rdev; 3568 int ret = 0, error; 3569 3570 mutex_lock(®ulator_list_mutex); 3571 list_for_each_entry(rdev, ®ulator_list, list) { 3572 struct regulator_ops *ops = rdev->desc->ops; 3573 3574 mutex_lock(&rdev->mutex); 3575 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3576 ops->enable) { 3577 error = ops->enable(rdev); 3578 if (error) 3579 ret = error; 3580 } else { 3581 if (!has_full_constraints) 3582 goto unlock; 3583 if (!ops->disable) 3584 goto unlock; 3585 if (!_regulator_is_enabled(rdev)) 3586 goto unlock; 3587 3588 error = ops->disable(rdev); 3589 if (error) 3590 ret = error; 3591 } 3592unlock: 3593 mutex_unlock(&rdev->mutex); 3594 } 3595 mutex_unlock(®ulator_list_mutex); 3596 return ret; 3597} 3598EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3599 3600/** 3601 * regulator_has_full_constraints - the system has fully specified constraints 3602 * 3603 * Calling this function will cause the regulator API to disable all 3604 * regulators which have a zero use count and don't have an always_on 3605 * constraint in a late_initcall. 3606 * 3607 * The intention is that this will become the default behaviour in a 3608 * future kernel release so users are encouraged to use this facility 3609 * now. 3610 */ 3611void regulator_has_full_constraints(void) 3612{ 3613 has_full_constraints = 1; 3614} 3615EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3616 3617/** 3618 * rdev_get_drvdata - get rdev regulator driver data 3619 * @rdev: regulator 3620 * 3621 * Get rdev regulator driver private data. This call can be used in the 3622 * regulator driver context. 3623 */ 3624void *rdev_get_drvdata(struct regulator_dev *rdev) 3625{ 3626 return rdev->reg_data; 3627} 3628EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3629 3630/** 3631 * regulator_get_drvdata - get regulator driver data 3632 * @regulator: regulator 3633 * 3634 * Get regulator driver private data. This call can be used in the consumer 3635 * driver context when non API regulator specific functions need to be called. 3636 */ 3637void *regulator_get_drvdata(struct regulator *regulator) 3638{ 3639 return regulator->rdev->reg_data; 3640} 3641EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3642 3643/** 3644 * regulator_set_drvdata - set regulator driver data 3645 * @regulator: regulator 3646 * @data: data 3647 */ 3648void regulator_set_drvdata(struct regulator *regulator, void *data) 3649{ 3650 regulator->rdev->reg_data = data; 3651} 3652EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3653 3654/** 3655 * regulator_get_id - get regulator ID 3656 * @rdev: regulator 3657 */ 3658int rdev_get_id(struct regulator_dev *rdev) 3659{ 3660 return rdev->desc->id; 3661} 3662EXPORT_SYMBOL_GPL(rdev_get_id); 3663 3664struct device *rdev_get_dev(struct regulator_dev *rdev) 3665{ 3666 return &rdev->dev; 3667} 3668EXPORT_SYMBOL_GPL(rdev_get_dev); 3669 3670void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3671{ 3672 return reg_init_data->driver_data; 3673} 3674EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3675 3676#ifdef CONFIG_DEBUG_FS 3677static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3678 size_t count, loff_t *ppos) 3679{ 3680 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3681 ssize_t len, ret = 0; 3682 struct regulator_map *map; 3683 3684 if (!buf) 3685 return -ENOMEM; 3686 3687 list_for_each_entry(map, ®ulator_map_list, list) { 3688 len = snprintf(buf + ret, PAGE_SIZE - ret, 3689 "%s -> %s.%s\n", 3690 rdev_get_name(map->regulator), map->dev_name, 3691 map->supply); 3692 if (len >= 0) 3693 ret += len; 3694 if (ret > PAGE_SIZE) { 3695 ret = PAGE_SIZE; 3696 break; 3697 } 3698 } 3699 3700 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3701 3702 kfree(buf); 3703 3704 return ret; 3705} 3706#endif 3707 3708static const struct file_operations supply_map_fops = { 3709#ifdef CONFIG_DEBUG_FS 3710 .read = supply_map_read_file, 3711 .llseek = default_llseek, 3712#endif 3713}; 3714 3715static int __init regulator_init(void) 3716{ 3717 int ret; 3718 3719 ret = class_register(®ulator_class); 3720 3721 debugfs_root = debugfs_create_dir("regulator", NULL); 3722 if (!debugfs_root) 3723 pr_warn("regulator: Failed to create debugfs directory\n"); 3724 3725 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3726 &supply_map_fops); 3727 3728 regulator_dummy_init(); 3729 3730 return ret; 3731} 3732 3733/* init early to allow our consumers to complete system booting */ 3734core_initcall(regulator_init); 3735 3736static int __init regulator_init_complete(void) 3737{ 3738 struct regulator_dev *rdev; 3739 struct regulator_ops *ops; 3740 struct regulation_constraints *c; 3741 int enabled, ret; 3742 3743 /* 3744 * Since DT doesn't provide an idiomatic mechanism for 3745 * enabling full constraints and since it's much more natural 3746 * with DT to provide them just assume that a DT enabled 3747 * system has full constraints. 3748 */ 3749 if (of_have_populated_dt()) 3750 has_full_constraints = true; 3751 3752 mutex_lock(®ulator_list_mutex); 3753 3754 /* If we have a full configuration then disable any regulators 3755 * which are not in use or always_on. This will become the 3756 * default behaviour in the future. 3757 */ 3758 list_for_each_entry(rdev, ®ulator_list, list) { 3759 ops = rdev->desc->ops; 3760 c = rdev->constraints; 3761 3762 if (!ops->disable || (c && c->always_on)) 3763 continue; 3764 3765 mutex_lock(&rdev->mutex); 3766 3767 if (rdev->use_count) 3768 goto unlock; 3769 3770 /* If we can't read the status assume it's on. */ 3771 if (ops->is_enabled) 3772 enabled = ops->is_enabled(rdev); 3773 else 3774 enabled = 1; 3775 3776 if (!enabled) 3777 goto unlock; 3778 3779 if (has_full_constraints) { 3780 /* We log since this may kill the system if it 3781 * goes wrong. */ 3782 rdev_info(rdev, "disabling\n"); 3783 ret = ops->disable(rdev); 3784 if (ret != 0) { 3785 rdev_err(rdev, "couldn't disable: %d\n", ret); 3786 } 3787 } else { 3788 /* The intention is that in future we will 3789 * assume that full constraints are provided 3790 * so warn even if we aren't going to do 3791 * anything here. 3792 */ 3793 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3794 } 3795 3796unlock: 3797 mutex_unlock(&rdev->mutex); 3798 } 3799 3800 mutex_unlock(®ulator_list_mutex); 3801 3802 return 0; 3803} 3804late_initcall(regulator_init_complete); 3805