core.c revision 03ffcf3d0838bd5e693cd4520becfb22577cf34d
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/of.h> 27#include <linux/regmap.h> 28#include <linux/regulator/of_regulator.h> 29#include <linux/regulator/consumer.h> 30#include <linux/regulator/driver.h> 31#include <linux/regulator/machine.h> 32#include <linux/module.h> 33 34#define CREATE_TRACE_POINTS 35#include <trace/events/regulator.h> 36 37#include "dummy.h" 38 39#define rdev_crit(rdev, fmt, ...) \ 40 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 41#define rdev_err(rdev, fmt, ...) \ 42 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 43#define rdev_warn(rdev, fmt, ...) \ 44 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 45#define rdev_info(rdev, fmt, ...) \ 46 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 47#define rdev_dbg(rdev, fmt, ...) \ 48 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 49 50static DEFINE_MUTEX(regulator_list_mutex); 51static LIST_HEAD(regulator_list); 52static LIST_HEAD(regulator_map_list); 53static bool has_full_constraints; 54static bool board_wants_dummy_regulator; 55 56static struct dentry *debugfs_root; 57 58/* 59 * struct regulator_map 60 * 61 * Used to provide symbolic supply names to devices. 62 */ 63struct regulator_map { 64 struct list_head list; 65 const char *dev_name; /* The dev_name() for the consumer */ 66 const char *supply; 67 struct regulator_dev *regulator; 68}; 69 70/* 71 * struct regulator 72 * 73 * One for each consumer device. 74 */ 75struct regulator { 76 struct device *dev; 77 struct list_head list; 78 unsigned int always_on:1; 79 int uA_load; 80 int min_uV; 81 int max_uV; 82 char *supply_name; 83 struct device_attribute dev_attr; 84 struct regulator_dev *rdev; 85 struct dentry *debugfs; 86}; 87 88static int _regulator_is_enabled(struct regulator_dev *rdev); 89static int _regulator_disable(struct regulator_dev *rdev); 90static int _regulator_get_voltage(struct regulator_dev *rdev); 91static int _regulator_get_current_limit(struct regulator_dev *rdev); 92static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 93static void _notifier_call_chain(struct regulator_dev *rdev, 94 unsigned long event, void *data); 95static int _regulator_do_set_voltage(struct regulator_dev *rdev, 96 int min_uV, int max_uV); 97static struct regulator *create_regulator(struct regulator_dev *rdev, 98 struct device *dev, 99 const char *supply_name); 100 101static const char *rdev_get_name(struct regulator_dev *rdev) 102{ 103 if (rdev->constraints && rdev->constraints->name) 104 return rdev->constraints->name; 105 else if (rdev->desc->name) 106 return rdev->desc->name; 107 else 108 return ""; 109} 110 111/** 112 * of_get_regulator - get a regulator device node based on supply name 113 * @dev: Device pointer for the consumer (of regulator) device 114 * @supply: regulator supply name 115 * 116 * Extract the regulator device node corresponding to the supply name. 117 * retruns the device node corresponding to the regulator if found, else 118 * returns NULL. 119 */ 120static struct device_node *of_get_regulator(struct device *dev, const char *supply) 121{ 122 struct device_node *regnode = NULL; 123 char prop_name[32]; /* 32 is max size of property name */ 124 125 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 126 127 snprintf(prop_name, 32, "%s-supply", supply); 128 regnode = of_parse_phandle(dev->of_node, prop_name, 0); 129 130 if (!regnode) { 131 dev_dbg(dev, "Looking up %s property in node %s failed", 132 prop_name, dev->of_node->full_name); 133 return NULL; 134 } 135 return regnode; 136} 137 138static int _regulator_can_change_status(struct regulator_dev *rdev) 139{ 140 if (!rdev->constraints) 141 return 0; 142 143 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 144 return 1; 145 else 146 return 0; 147} 148 149/* Platform voltage constraint check */ 150static int regulator_check_voltage(struct regulator_dev *rdev, 151 int *min_uV, int *max_uV) 152{ 153 BUG_ON(*min_uV > *max_uV); 154 155 if (!rdev->constraints) { 156 rdev_err(rdev, "no constraints\n"); 157 return -ENODEV; 158 } 159 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 160 rdev_err(rdev, "operation not allowed\n"); 161 return -EPERM; 162 } 163 164 if (*max_uV > rdev->constraints->max_uV) 165 *max_uV = rdev->constraints->max_uV; 166 if (*min_uV < rdev->constraints->min_uV) 167 *min_uV = rdev->constraints->min_uV; 168 169 if (*min_uV > *max_uV) { 170 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 171 *min_uV, *max_uV); 172 return -EINVAL; 173 } 174 175 return 0; 176} 177 178/* Make sure we select a voltage that suits the needs of all 179 * regulator consumers 180 */ 181static int regulator_check_consumers(struct regulator_dev *rdev, 182 int *min_uV, int *max_uV) 183{ 184 struct regulator *regulator; 185 186 list_for_each_entry(regulator, &rdev->consumer_list, list) { 187 /* 188 * Assume consumers that didn't say anything are OK 189 * with anything in the constraint range. 190 */ 191 if (!regulator->min_uV && !regulator->max_uV) 192 continue; 193 194 if (*max_uV > regulator->max_uV) 195 *max_uV = regulator->max_uV; 196 if (*min_uV < regulator->min_uV) 197 *min_uV = regulator->min_uV; 198 } 199 200 if (*min_uV > *max_uV) 201 return -EINVAL; 202 203 return 0; 204} 205 206/* current constraint check */ 207static int regulator_check_current_limit(struct regulator_dev *rdev, 208 int *min_uA, int *max_uA) 209{ 210 BUG_ON(*min_uA > *max_uA); 211 212 if (!rdev->constraints) { 213 rdev_err(rdev, "no constraints\n"); 214 return -ENODEV; 215 } 216 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 217 rdev_err(rdev, "operation not allowed\n"); 218 return -EPERM; 219 } 220 221 if (*max_uA > rdev->constraints->max_uA) 222 *max_uA = rdev->constraints->max_uA; 223 if (*min_uA < rdev->constraints->min_uA) 224 *min_uA = rdev->constraints->min_uA; 225 226 if (*min_uA > *max_uA) { 227 rdev_err(rdev, "unsupportable current range: %d-%duA\n", 228 *min_uA, *max_uA); 229 return -EINVAL; 230 } 231 232 return 0; 233} 234 235/* operating mode constraint check */ 236static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 237{ 238 switch (*mode) { 239 case REGULATOR_MODE_FAST: 240 case REGULATOR_MODE_NORMAL: 241 case REGULATOR_MODE_IDLE: 242 case REGULATOR_MODE_STANDBY: 243 break; 244 default: 245 rdev_err(rdev, "invalid mode %x specified\n", *mode); 246 return -EINVAL; 247 } 248 249 if (!rdev->constraints) { 250 rdev_err(rdev, "no constraints\n"); 251 return -ENODEV; 252 } 253 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 254 rdev_err(rdev, "operation not allowed\n"); 255 return -EPERM; 256 } 257 258 /* The modes are bitmasks, the most power hungry modes having 259 * the lowest values. If the requested mode isn't supported 260 * try higher modes. */ 261 while (*mode) { 262 if (rdev->constraints->valid_modes_mask & *mode) 263 return 0; 264 *mode /= 2; 265 } 266 267 return -EINVAL; 268} 269 270/* dynamic regulator mode switching constraint check */ 271static int regulator_check_drms(struct regulator_dev *rdev) 272{ 273 if (!rdev->constraints) { 274 rdev_err(rdev, "no constraints\n"); 275 return -ENODEV; 276 } 277 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 278 rdev_err(rdev, "operation not allowed\n"); 279 return -EPERM; 280 } 281 return 0; 282} 283 284static ssize_t regulator_uV_show(struct device *dev, 285 struct device_attribute *attr, char *buf) 286{ 287 struct regulator_dev *rdev = dev_get_drvdata(dev); 288 ssize_t ret; 289 290 mutex_lock(&rdev->mutex); 291 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 292 mutex_unlock(&rdev->mutex); 293 294 return ret; 295} 296static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 297 298static ssize_t regulator_uA_show(struct device *dev, 299 struct device_attribute *attr, char *buf) 300{ 301 struct regulator_dev *rdev = dev_get_drvdata(dev); 302 303 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 304} 305static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 306 307static ssize_t regulator_name_show(struct device *dev, 308 struct device_attribute *attr, char *buf) 309{ 310 struct regulator_dev *rdev = dev_get_drvdata(dev); 311 312 return sprintf(buf, "%s\n", rdev_get_name(rdev)); 313} 314 315static ssize_t regulator_print_opmode(char *buf, int mode) 316{ 317 switch (mode) { 318 case REGULATOR_MODE_FAST: 319 return sprintf(buf, "fast\n"); 320 case REGULATOR_MODE_NORMAL: 321 return sprintf(buf, "normal\n"); 322 case REGULATOR_MODE_IDLE: 323 return sprintf(buf, "idle\n"); 324 case REGULATOR_MODE_STANDBY: 325 return sprintf(buf, "standby\n"); 326 } 327 return sprintf(buf, "unknown\n"); 328} 329 330static ssize_t regulator_opmode_show(struct device *dev, 331 struct device_attribute *attr, char *buf) 332{ 333 struct regulator_dev *rdev = dev_get_drvdata(dev); 334 335 return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 336} 337static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 338 339static ssize_t regulator_print_state(char *buf, int state) 340{ 341 if (state > 0) 342 return sprintf(buf, "enabled\n"); 343 else if (state == 0) 344 return sprintf(buf, "disabled\n"); 345 else 346 return sprintf(buf, "unknown\n"); 347} 348 349static ssize_t regulator_state_show(struct device *dev, 350 struct device_attribute *attr, char *buf) 351{ 352 struct regulator_dev *rdev = dev_get_drvdata(dev); 353 ssize_t ret; 354 355 mutex_lock(&rdev->mutex); 356 ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 357 mutex_unlock(&rdev->mutex); 358 359 return ret; 360} 361static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 362 363static ssize_t regulator_status_show(struct device *dev, 364 struct device_attribute *attr, char *buf) 365{ 366 struct regulator_dev *rdev = dev_get_drvdata(dev); 367 int status; 368 char *label; 369 370 status = rdev->desc->ops->get_status(rdev); 371 if (status < 0) 372 return status; 373 374 switch (status) { 375 case REGULATOR_STATUS_OFF: 376 label = "off"; 377 break; 378 case REGULATOR_STATUS_ON: 379 label = "on"; 380 break; 381 case REGULATOR_STATUS_ERROR: 382 label = "error"; 383 break; 384 case REGULATOR_STATUS_FAST: 385 label = "fast"; 386 break; 387 case REGULATOR_STATUS_NORMAL: 388 label = "normal"; 389 break; 390 case REGULATOR_STATUS_IDLE: 391 label = "idle"; 392 break; 393 case REGULATOR_STATUS_STANDBY: 394 label = "standby"; 395 break; 396 default: 397 return -ERANGE; 398 } 399 400 return sprintf(buf, "%s\n", label); 401} 402static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 403 404static ssize_t regulator_min_uA_show(struct device *dev, 405 struct device_attribute *attr, char *buf) 406{ 407 struct regulator_dev *rdev = dev_get_drvdata(dev); 408 409 if (!rdev->constraints) 410 return sprintf(buf, "constraint not defined\n"); 411 412 return sprintf(buf, "%d\n", rdev->constraints->min_uA); 413} 414static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 415 416static ssize_t regulator_max_uA_show(struct device *dev, 417 struct device_attribute *attr, char *buf) 418{ 419 struct regulator_dev *rdev = dev_get_drvdata(dev); 420 421 if (!rdev->constraints) 422 return sprintf(buf, "constraint not defined\n"); 423 424 return sprintf(buf, "%d\n", rdev->constraints->max_uA); 425} 426static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 427 428static ssize_t regulator_min_uV_show(struct device *dev, 429 struct device_attribute *attr, char *buf) 430{ 431 struct regulator_dev *rdev = dev_get_drvdata(dev); 432 433 if (!rdev->constraints) 434 return sprintf(buf, "constraint not defined\n"); 435 436 return sprintf(buf, "%d\n", rdev->constraints->min_uV); 437} 438static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 439 440static ssize_t regulator_max_uV_show(struct device *dev, 441 struct device_attribute *attr, char *buf) 442{ 443 struct regulator_dev *rdev = dev_get_drvdata(dev); 444 445 if (!rdev->constraints) 446 return sprintf(buf, "constraint not defined\n"); 447 448 return sprintf(buf, "%d\n", rdev->constraints->max_uV); 449} 450static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 451 452static ssize_t regulator_total_uA_show(struct device *dev, 453 struct device_attribute *attr, char *buf) 454{ 455 struct regulator_dev *rdev = dev_get_drvdata(dev); 456 struct regulator *regulator; 457 int uA = 0; 458 459 mutex_lock(&rdev->mutex); 460 list_for_each_entry(regulator, &rdev->consumer_list, list) 461 uA += regulator->uA_load; 462 mutex_unlock(&rdev->mutex); 463 return sprintf(buf, "%d\n", uA); 464} 465static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 466 467static ssize_t regulator_num_users_show(struct device *dev, 468 struct device_attribute *attr, char *buf) 469{ 470 struct regulator_dev *rdev = dev_get_drvdata(dev); 471 return sprintf(buf, "%d\n", rdev->use_count); 472} 473 474static ssize_t regulator_type_show(struct device *dev, 475 struct device_attribute *attr, char *buf) 476{ 477 struct regulator_dev *rdev = dev_get_drvdata(dev); 478 479 switch (rdev->desc->type) { 480 case REGULATOR_VOLTAGE: 481 return sprintf(buf, "voltage\n"); 482 case REGULATOR_CURRENT: 483 return sprintf(buf, "current\n"); 484 } 485 return sprintf(buf, "unknown\n"); 486} 487 488static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 489 struct device_attribute *attr, char *buf) 490{ 491 struct regulator_dev *rdev = dev_get_drvdata(dev); 492 493 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 494} 495static DEVICE_ATTR(suspend_mem_microvolts, 0444, 496 regulator_suspend_mem_uV_show, NULL); 497 498static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 499 struct device_attribute *attr, char *buf) 500{ 501 struct regulator_dev *rdev = dev_get_drvdata(dev); 502 503 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 504} 505static DEVICE_ATTR(suspend_disk_microvolts, 0444, 506 regulator_suspend_disk_uV_show, NULL); 507 508static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 509 struct device_attribute *attr, char *buf) 510{ 511 struct regulator_dev *rdev = dev_get_drvdata(dev); 512 513 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 514} 515static DEVICE_ATTR(suspend_standby_microvolts, 0444, 516 regulator_suspend_standby_uV_show, NULL); 517 518static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 519 struct device_attribute *attr, char *buf) 520{ 521 struct regulator_dev *rdev = dev_get_drvdata(dev); 522 523 return regulator_print_opmode(buf, 524 rdev->constraints->state_mem.mode); 525} 526static DEVICE_ATTR(suspend_mem_mode, 0444, 527 regulator_suspend_mem_mode_show, NULL); 528 529static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 530 struct device_attribute *attr, char *buf) 531{ 532 struct regulator_dev *rdev = dev_get_drvdata(dev); 533 534 return regulator_print_opmode(buf, 535 rdev->constraints->state_disk.mode); 536} 537static DEVICE_ATTR(suspend_disk_mode, 0444, 538 regulator_suspend_disk_mode_show, NULL); 539 540static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 541 struct device_attribute *attr, char *buf) 542{ 543 struct regulator_dev *rdev = dev_get_drvdata(dev); 544 545 return regulator_print_opmode(buf, 546 rdev->constraints->state_standby.mode); 547} 548static DEVICE_ATTR(suspend_standby_mode, 0444, 549 regulator_suspend_standby_mode_show, NULL); 550 551static ssize_t regulator_suspend_mem_state_show(struct device *dev, 552 struct device_attribute *attr, char *buf) 553{ 554 struct regulator_dev *rdev = dev_get_drvdata(dev); 555 556 return regulator_print_state(buf, 557 rdev->constraints->state_mem.enabled); 558} 559static DEVICE_ATTR(suspend_mem_state, 0444, 560 regulator_suspend_mem_state_show, NULL); 561 562static ssize_t regulator_suspend_disk_state_show(struct device *dev, 563 struct device_attribute *attr, char *buf) 564{ 565 struct regulator_dev *rdev = dev_get_drvdata(dev); 566 567 return regulator_print_state(buf, 568 rdev->constraints->state_disk.enabled); 569} 570static DEVICE_ATTR(suspend_disk_state, 0444, 571 regulator_suspend_disk_state_show, NULL); 572 573static ssize_t regulator_suspend_standby_state_show(struct device *dev, 574 struct device_attribute *attr, char *buf) 575{ 576 struct regulator_dev *rdev = dev_get_drvdata(dev); 577 578 return regulator_print_state(buf, 579 rdev->constraints->state_standby.enabled); 580} 581static DEVICE_ATTR(suspend_standby_state, 0444, 582 regulator_suspend_standby_state_show, NULL); 583 584 585/* 586 * These are the only attributes are present for all regulators. 587 * Other attributes are a function of regulator functionality. 588 */ 589static struct device_attribute regulator_dev_attrs[] = { 590 __ATTR(name, 0444, regulator_name_show, NULL), 591 __ATTR(num_users, 0444, regulator_num_users_show, NULL), 592 __ATTR(type, 0444, regulator_type_show, NULL), 593 __ATTR_NULL, 594}; 595 596static void regulator_dev_release(struct device *dev) 597{ 598 struct regulator_dev *rdev = dev_get_drvdata(dev); 599 kfree(rdev); 600} 601 602static struct class regulator_class = { 603 .name = "regulator", 604 .dev_release = regulator_dev_release, 605 .dev_attrs = regulator_dev_attrs, 606}; 607 608/* Calculate the new optimum regulator operating mode based on the new total 609 * consumer load. All locks held by caller */ 610static void drms_uA_update(struct regulator_dev *rdev) 611{ 612 struct regulator *sibling; 613 int current_uA = 0, output_uV, input_uV, err; 614 unsigned int mode; 615 616 err = regulator_check_drms(rdev); 617 if (err < 0 || !rdev->desc->ops->get_optimum_mode || 618 (!rdev->desc->ops->get_voltage && 619 !rdev->desc->ops->get_voltage_sel) || 620 !rdev->desc->ops->set_mode) 621 return; 622 623 /* get output voltage */ 624 output_uV = _regulator_get_voltage(rdev); 625 if (output_uV <= 0) 626 return; 627 628 /* get input voltage */ 629 input_uV = 0; 630 if (rdev->supply) 631 input_uV = regulator_get_voltage(rdev->supply); 632 if (input_uV <= 0) 633 input_uV = rdev->constraints->input_uV; 634 if (input_uV <= 0) 635 return; 636 637 /* calc total requested load */ 638 list_for_each_entry(sibling, &rdev->consumer_list, list) 639 current_uA += sibling->uA_load; 640 641 /* now get the optimum mode for our new total regulator load */ 642 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 643 output_uV, current_uA); 644 645 /* check the new mode is allowed */ 646 err = regulator_mode_constrain(rdev, &mode); 647 if (err == 0) 648 rdev->desc->ops->set_mode(rdev, mode); 649} 650 651static int suspend_set_state(struct regulator_dev *rdev, 652 struct regulator_state *rstate) 653{ 654 int ret = 0; 655 656 /* If we have no suspend mode configration don't set anything; 657 * only warn if the driver implements set_suspend_voltage or 658 * set_suspend_mode callback. 659 */ 660 if (!rstate->enabled && !rstate->disabled) { 661 if (rdev->desc->ops->set_suspend_voltage || 662 rdev->desc->ops->set_suspend_mode) 663 rdev_warn(rdev, "No configuration\n"); 664 return 0; 665 } 666 667 if (rstate->enabled && rstate->disabled) { 668 rdev_err(rdev, "invalid configuration\n"); 669 return -EINVAL; 670 } 671 672 if (rstate->enabled && rdev->desc->ops->set_suspend_enable) 673 ret = rdev->desc->ops->set_suspend_enable(rdev); 674 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) 675 ret = rdev->desc->ops->set_suspend_disable(rdev); 676 else /* OK if set_suspend_enable or set_suspend_disable is NULL */ 677 ret = 0; 678 679 if (ret < 0) { 680 rdev_err(rdev, "failed to enabled/disable\n"); 681 return ret; 682 } 683 684 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 685 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 686 if (ret < 0) { 687 rdev_err(rdev, "failed to set voltage\n"); 688 return ret; 689 } 690 } 691 692 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 693 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 694 if (ret < 0) { 695 rdev_err(rdev, "failed to set mode\n"); 696 return ret; 697 } 698 } 699 return ret; 700} 701 702/* locks held by caller */ 703static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 704{ 705 if (!rdev->constraints) 706 return -EINVAL; 707 708 switch (state) { 709 case PM_SUSPEND_STANDBY: 710 return suspend_set_state(rdev, 711 &rdev->constraints->state_standby); 712 case PM_SUSPEND_MEM: 713 return suspend_set_state(rdev, 714 &rdev->constraints->state_mem); 715 case PM_SUSPEND_MAX: 716 return suspend_set_state(rdev, 717 &rdev->constraints->state_disk); 718 default: 719 return -EINVAL; 720 } 721} 722 723static void print_constraints(struct regulator_dev *rdev) 724{ 725 struct regulation_constraints *constraints = rdev->constraints; 726 char buf[80] = ""; 727 int count = 0; 728 int ret; 729 730 if (constraints->min_uV && constraints->max_uV) { 731 if (constraints->min_uV == constraints->max_uV) 732 count += sprintf(buf + count, "%d mV ", 733 constraints->min_uV / 1000); 734 else 735 count += sprintf(buf + count, "%d <--> %d mV ", 736 constraints->min_uV / 1000, 737 constraints->max_uV / 1000); 738 } 739 740 if (!constraints->min_uV || 741 constraints->min_uV != constraints->max_uV) { 742 ret = _regulator_get_voltage(rdev); 743 if (ret > 0) 744 count += sprintf(buf + count, "at %d mV ", ret / 1000); 745 } 746 747 if (constraints->uV_offset) 748 count += sprintf(buf, "%dmV offset ", 749 constraints->uV_offset / 1000); 750 751 if (constraints->min_uA && constraints->max_uA) { 752 if (constraints->min_uA == constraints->max_uA) 753 count += sprintf(buf + count, "%d mA ", 754 constraints->min_uA / 1000); 755 else 756 count += sprintf(buf + count, "%d <--> %d mA ", 757 constraints->min_uA / 1000, 758 constraints->max_uA / 1000); 759 } 760 761 if (!constraints->min_uA || 762 constraints->min_uA != constraints->max_uA) { 763 ret = _regulator_get_current_limit(rdev); 764 if (ret > 0) 765 count += sprintf(buf + count, "at %d mA ", ret / 1000); 766 } 767 768 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 769 count += sprintf(buf + count, "fast "); 770 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 771 count += sprintf(buf + count, "normal "); 772 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 773 count += sprintf(buf + count, "idle "); 774 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 775 count += sprintf(buf + count, "standby"); 776 777 rdev_info(rdev, "%s\n", buf); 778 779 if ((constraints->min_uV != constraints->max_uV) && 780 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 781 rdev_warn(rdev, 782 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 783} 784 785static int machine_constraints_voltage(struct regulator_dev *rdev, 786 struct regulation_constraints *constraints) 787{ 788 struct regulator_ops *ops = rdev->desc->ops; 789 int ret; 790 791 /* do we need to apply the constraint voltage */ 792 if (rdev->constraints->apply_uV && 793 rdev->constraints->min_uV == rdev->constraints->max_uV) { 794 ret = _regulator_do_set_voltage(rdev, 795 rdev->constraints->min_uV, 796 rdev->constraints->max_uV); 797 if (ret < 0) { 798 rdev_err(rdev, "failed to apply %duV constraint\n", 799 rdev->constraints->min_uV); 800 return ret; 801 } 802 } 803 804 /* constrain machine-level voltage specs to fit 805 * the actual range supported by this regulator. 806 */ 807 if (ops->list_voltage && rdev->desc->n_voltages) { 808 int count = rdev->desc->n_voltages; 809 int i; 810 int min_uV = INT_MAX; 811 int max_uV = INT_MIN; 812 int cmin = constraints->min_uV; 813 int cmax = constraints->max_uV; 814 815 /* it's safe to autoconfigure fixed-voltage supplies 816 and the constraints are used by list_voltage. */ 817 if (count == 1 && !cmin) { 818 cmin = 1; 819 cmax = INT_MAX; 820 constraints->min_uV = cmin; 821 constraints->max_uV = cmax; 822 } 823 824 /* voltage constraints are optional */ 825 if ((cmin == 0) && (cmax == 0)) 826 return 0; 827 828 /* else require explicit machine-level constraints */ 829 if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 830 rdev_err(rdev, "invalid voltage constraints\n"); 831 return -EINVAL; 832 } 833 834 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 835 for (i = 0; i < count; i++) { 836 int value; 837 838 value = ops->list_voltage(rdev, i); 839 if (value <= 0) 840 continue; 841 842 /* maybe adjust [min_uV..max_uV] */ 843 if (value >= cmin && value < min_uV) 844 min_uV = value; 845 if (value <= cmax && value > max_uV) 846 max_uV = value; 847 } 848 849 /* final: [min_uV..max_uV] valid iff constraints valid */ 850 if (max_uV < min_uV) { 851 rdev_err(rdev, "unsupportable voltage constraints\n"); 852 return -EINVAL; 853 } 854 855 /* use regulator's subset of machine constraints */ 856 if (constraints->min_uV < min_uV) { 857 rdev_dbg(rdev, "override min_uV, %d -> %d\n", 858 constraints->min_uV, min_uV); 859 constraints->min_uV = min_uV; 860 } 861 if (constraints->max_uV > max_uV) { 862 rdev_dbg(rdev, "override max_uV, %d -> %d\n", 863 constraints->max_uV, max_uV); 864 constraints->max_uV = max_uV; 865 } 866 } 867 868 return 0; 869} 870 871/** 872 * set_machine_constraints - sets regulator constraints 873 * @rdev: regulator source 874 * @constraints: constraints to apply 875 * 876 * Allows platform initialisation code to define and constrain 877 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 878 * Constraints *must* be set by platform code in order for some 879 * regulator operations to proceed i.e. set_voltage, set_current_limit, 880 * set_mode. 881 */ 882static int set_machine_constraints(struct regulator_dev *rdev, 883 const struct regulation_constraints *constraints) 884{ 885 int ret = 0; 886 struct regulator_ops *ops = rdev->desc->ops; 887 888 if (constraints) 889 rdev->constraints = kmemdup(constraints, sizeof(*constraints), 890 GFP_KERNEL); 891 else 892 rdev->constraints = kzalloc(sizeof(*constraints), 893 GFP_KERNEL); 894 if (!rdev->constraints) 895 return -ENOMEM; 896 897 ret = machine_constraints_voltage(rdev, rdev->constraints); 898 if (ret != 0) 899 goto out; 900 901 /* do we need to setup our suspend state */ 902 if (rdev->constraints->initial_state) { 903 ret = suspend_prepare(rdev, rdev->constraints->initial_state); 904 if (ret < 0) { 905 rdev_err(rdev, "failed to set suspend state\n"); 906 goto out; 907 } 908 } 909 910 if (rdev->constraints->initial_mode) { 911 if (!ops->set_mode) { 912 rdev_err(rdev, "no set_mode operation\n"); 913 ret = -EINVAL; 914 goto out; 915 } 916 917 ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 918 if (ret < 0) { 919 rdev_err(rdev, "failed to set initial mode: %d\n", ret); 920 goto out; 921 } 922 } 923 924 /* If the constraints say the regulator should be on at this point 925 * and we have control then make sure it is enabled. 926 */ 927 if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 928 ops->enable) { 929 ret = ops->enable(rdev); 930 if (ret < 0) { 931 rdev_err(rdev, "failed to enable\n"); 932 goto out; 933 } 934 } 935 936 print_constraints(rdev); 937 return 0; 938out: 939 kfree(rdev->constraints); 940 rdev->constraints = NULL; 941 return ret; 942} 943 944/** 945 * set_supply - set regulator supply regulator 946 * @rdev: regulator name 947 * @supply_rdev: supply regulator name 948 * 949 * Called by platform initialisation code to set the supply regulator for this 950 * regulator. This ensures that a regulators supply will also be enabled by the 951 * core if it's child is enabled. 952 */ 953static int set_supply(struct regulator_dev *rdev, 954 struct regulator_dev *supply_rdev) 955{ 956 int err; 957 958 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 959 960 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 961 if (rdev->supply == NULL) { 962 err = -ENOMEM; 963 return err; 964 } 965 966 return 0; 967} 968 969/** 970 * set_consumer_device_supply - Bind a regulator to a symbolic supply 971 * @rdev: regulator source 972 * @consumer_dev_name: dev_name() string for device supply applies to 973 * @supply: symbolic name for supply 974 * 975 * Allows platform initialisation code to map physical regulator 976 * sources to symbolic names for supplies for use by devices. Devices 977 * should use these symbolic names to request regulators, avoiding the 978 * need to provide board-specific regulator names as platform data. 979 */ 980static int set_consumer_device_supply(struct regulator_dev *rdev, 981 const char *consumer_dev_name, 982 const char *supply) 983{ 984 struct regulator_map *node; 985 int has_dev; 986 987 if (supply == NULL) 988 return -EINVAL; 989 990 if (consumer_dev_name != NULL) 991 has_dev = 1; 992 else 993 has_dev = 0; 994 995 list_for_each_entry(node, ®ulator_map_list, list) { 996 if (node->dev_name && consumer_dev_name) { 997 if (strcmp(node->dev_name, consumer_dev_name) != 0) 998 continue; 999 } else if (node->dev_name || consumer_dev_name) { 1000 continue; 1001 } 1002 1003 if (strcmp(node->supply, supply) != 0) 1004 continue; 1005 1006 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", 1007 consumer_dev_name, 1008 dev_name(&node->regulator->dev), 1009 node->regulator->desc->name, 1010 supply, 1011 dev_name(&rdev->dev), rdev_get_name(rdev)); 1012 return -EBUSY; 1013 } 1014 1015 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1016 if (node == NULL) 1017 return -ENOMEM; 1018 1019 node->regulator = rdev; 1020 node->supply = supply; 1021 1022 if (has_dev) { 1023 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 1024 if (node->dev_name == NULL) { 1025 kfree(node); 1026 return -ENOMEM; 1027 } 1028 } 1029 1030 list_add(&node->list, ®ulator_map_list); 1031 return 0; 1032} 1033 1034static void unset_regulator_supplies(struct regulator_dev *rdev) 1035{ 1036 struct regulator_map *node, *n; 1037 1038 list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 1039 if (rdev == node->regulator) { 1040 list_del(&node->list); 1041 kfree(node->dev_name); 1042 kfree(node); 1043 } 1044 } 1045} 1046 1047#define REG_STR_SIZE 64 1048 1049static struct regulator *create_regulator(struct regulator_dev *rdev, 1050 struct device *dev, 1051 const char *supply_name) 1052{ 1053 struct regulator *regulator; 1054 char buf[REG_STR_SIZE]; 1055 int err, size; 1056 1057 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1058 if (regulator == NULL) 1059 return NULL; 1060 1061 mutex_lock(&rdev->mutex); 1062 regulator->rdev = rdev; 1063 list_add(®ulator->list, &rdev->consumer_list); 1064 1065 if (dev) { 1066 regulator->dev = dev; 1067 1068 /* Add a link to the device sysfs entry */ 1069 size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1070 dev->kobj.name, supply_name); 1071 if (size >= REG_STR_SIZE) 1072 goto overflow_err; 1073 1074 regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1075 if (regulator->supply_name == NULL) 1076 goto overflow_err; 1077 1078 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1079 buf); 1080 if (err) { 1081 rdev_warn(rdev, "could not add device link %s err %d\n", 1082 dev->kobj.name, err); 1083 /* non-fatal */ 1084 } 1085 } else { 1086 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 1087 if (regulator->supply_name == NULL) 1088 goto overflow_err; 1089 } 1090 1091 regulator->debugfs = debugfs_create_dir(regulator->supply_name, 1092 rdev->debugfs); 1093 if (!regulator->debugfs) { 1094 rdev_warn(rdev, "Failed to create debugfs directory\n"); 1095 } else { 1096 debugfs_create_u32("uA_load", 0444, regulator->debugfs, 1097 ®ulator->uA_load); 1098 debugfs_create_u32("min_uV", 0444, regulator->debugfs, 1099 ®ulator->min_uV); 1100 debugfs_create_u32("max_uV", 0444, regulator->debugfs, 1101 ®ulator->max_uV); 1102 } 1103 1104 /* 1105 * Check now if the regulator is an always on regulator - if 1106 * it is then we don't need to do nearly so much work for 1107 * enable/disable calls. 1108 */ 1109 if (!_regulator_can_change_status(rdev) && 1110 _regulator_is_enabled(rdev)) 1111 regulator->always_on = true; 1112 1113 mutex_unlock(&rdev->mutex); 1114 return regulator; 1115overflow_err: 1116 list_del(®ulator->list); 1117 kfree(regulator); 1118 mutex_unlock(&rdev->mutex); 1119 return NULL; 1120} 1121 1122static int _regulator_get_enable_time(struct regulator_dev *rdev) 1123{ 1124 if (!rdev->desc->ops->enable_time) 1125 return 0; 1126 return rdev->desc->ops->enable_time(rdev); 1127} 1128 1129static struct regulator_dev *regulator_dev_lookup(struct device *dev, 1130 const char *supply, 1131 int *ret) 1132{ 1133 struct regulator_dev *r; 1134 struct device_node *node; 1135 struct regulator_map *map; 1136 const char *devname = NULL; 1137 1138 /* first do a dt based lookup */ 1139 if (dev && dev->of_node) { 1140 node = of_get_regulator(dev, supply); 1141 if (node) { 1142 list_for_each_entry(r, ®ulator_list, list) 1143 if (r->dev.parent && 1144 node == r->dev.of_node) 1145 return r; 1146 } else { 1147 /* 1148 * If we couldn't even get the node then it's 1149 * not just that the device didn't register 1150 * yet, there's no node and we'll never 1151 * succeed. 1152 */ 1153 *ret = -ENODEV; 1154 } 1155 } 1156 1157 /* if not found, try doing it non-dt way */ 1158 if (dev) 1159 devname = dev_name(dev); 1160 1161 list_for_each_entry(r, ®ulator_list, list) 1162 if (strcmp(rdev_get_name(r), supply) == 0) 1163 return r; 1164 1165 list_for_each_entry(map, ®ulator_map_list, list) { 1166 /* If the mapping has a device set up it must match */ 1167 if (map->dev_name && 1168 (!devname || strcmp(map->dev_name, devname))) 1169 continue; 1170 1171 if (strcmp(map->supply, supply) == 0) 1172 return map->regulator; 1173 } 1174 1175 1176 return NULL; 1177} 1178 1179/* Internal regulator request function */ 1180static struct regulator *_regulator_get(struct device *dev, const char *id, 1181 int exclusive) 1182{ 1183 struct regulator_dev *rdev; 1184 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); 1185 const char *devname = NULL; 1186 int ret; 1187 1188 if (id == NULL) { 1189 pr_err("get() with no identifier\n"); 1190 return regulator; 1191 } 1192 1193 if (dev) 1194 devname = dev_name(dev); 1195 1196 mutex_lock(®ulator_list_mutex); 1197 1198 rdev = regulator_dev_lookup(dev, id, &ret); 1199 if (rdev) 1200 goto found; 1201 1202 if (board_wants_dummy_regulator) { 1203 rdev = dummy_regulator_rdev; 1204 goto found; 1205 } 1206 1207#ifdef CONFIG_REGULATOR_DUMMY 1208 if (!devname) 1209 devname = "deviceless"; 1210 1211 /* If the board didn't flag that it was fully constrained then 1212 * substitute in a dummy regulator so consumers can continue. 1213 */ 1214 if (!has_full_constraints) { 1215 pr_warn("%s supply %s not found, using dummy regulator\n", 1216 devname, id); 1217 rdev = dummy_regulator_rdev; 1218 goto found; 1219 } 1220#endif 1221 1222 mutex_unlock(®ulator_list_mutex); 1223 return regulator; 1224 1225found: 1226 if (rdev->exclusive) { 1227 regulator = ERR_PTR(-EPERM); 1228 goto out; 1229 } 1230 1231 if (exclusive && rdev->open_count) { 1232 regulator = ERR_PTR(-EBUSY); 1233 goto out; 1234 } 1235 1236 if (!try_module_get(rdev->owner)) 1237 goto out; 1238 1239 regulator = create_regulator(rdev, dev, id); 1240 if (regulator == NULL) { 1241 regulator = ERR_PTR(-ENOMEM); 1242 module_put(rdev->owner); 1243 goto out; 1244 } 1245 1246 rdev->open_count++; 1247 if (exclusive) { 1248 rdev->exclusive = 1; 1249 1250 ret = _regulator_is_enabled(rdev); 1251 if (ret > 0) 1252 rdev->use_count = 1; 1253 else 1254 rdev->use_count = 0; 1255 } 1256 1257out: 1258 mutex_unlock(®ulator_list_mutex); 1259 1260 return regulator; 1261} 1262 1263/** 1264 * regulator_get - lookup and obtain a reference to a regulator. 1265 * @dev: device for regulator "consumer" 1266 * @id: Supply name or regulator ID. 1267 * 1268 * Returns a struct regulator corresponding to the regulator producer, 1269 * or IS_ERR() condition containing errno. 1270 * 1271 * Use of supply names configured via regulator_set_device_supply() is 1272 * strongly encouraged. It is recommended that the supply name used 1273 * should match the name used for the supply and/or the relevant 1274 * device pins in the datasheet. 1275 */ 1276struct regulator *regulator_get(struct device *dev, const char *id) 1277{ 1278 return _regulator_get(dev, id, 0); 1279} 1280EXPORT_SYMBOL_GPL(regulator_get); 1281 1282static void devm_regulator_release(struct device *dev, void *res) 1283{ 1284 regulator_put(*(struct regulator **)res); 1285} 1286 1287/** 1288 * devm_regulator_get - Resource managed regulator_get() 1289 * @dev: device for regulator "consumer" 1290 * @id: Supply name or regulator ID. 1291 * 1292 * Managed regulator_get(). Regulators returned from this function are 1293 * automatically regulator_put() on driver detach. See regulator_get() for more 1294 * information. 1295 */ 1296struct regulator *devm_regulator_get(struct device *dev, const char *id) 1297{ 1298 struct regulator **ptr, *regulator; 1299 1300 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL); 1301 if (!ptr) 1302 return ERR_PTR(-ENOMEM); 1303 1304 regulator = regulator_get(dev, id); 1305 if (!IS_ERR(regulator)) { 1306 *ptr = regulator; 1307 devres_add(dev, ptr); 1308 } else { 1309 devres_free(ptr); 1310 } 1311 1312 return regulator; 1313} 1314EXPORT_SYMBOL_GPL(devm_regulator_get); 1315 1316/** 1317 * regulator_get_exclusive - obtain exclusive access to a regulator. 1318 * @dev: device for regulator "consumer" 1319 * @id: Supply name or regulator ID. 1320 * 1321 * Returns a struct regulator corresponding to the regulator producer, 1322 * or IS_ERR() condition containing errno. Other consumers will be 1323 * unable to obtain this reference is held and the use count for the 1324 * regulator will be initialised to reflect the current state of the 1325 * regulator. 1326 * 1327 * This is intended for use by consumers which cannot tolerate shared 1328 * use of the regulator such as those which need to force the 1329 * regulator off for correct operation of the hardware they are 1330 * controlling. 1331 * 1332 * Use of supply names configured via regulator_set_device_supply() is 1333 * strongly encouraged. It is recommended that the supply name used 1334 * should match the name used for the supply and/or the relevant 1335 * device pins in the datasheet. 1336 */ 1337struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 1338{ 1339 return _regulator_get(dev, id, 1); 1340} 1341EXPORT_SYMBOL_GPL(regulator_get_exclusive); 1342 1343/** 1344 * regulator_put - "free" the regulator source 1345 * @regulator: regulator source 1346 * 1347 * Note: drivers must ensure that all regulator_enable calls made on this 1348 * regulator source are balanced by regulator_disable calls prior to calling 1349 * this function. 1350 */ 1351void regulator_put(struct regulator *regulator) 1352{ 1353 struct regulator_dev *rdev; 1354 1355 if (regulator == NULL || IS_ERR(regulator)) 1356 return; 1357 1358 mutex_lock(®ulator_list_mutex); 1359 rdev = regulator->rdev; 1360 1361 debugfs_remove_recursive(regulator->debugfs); 1362 1363 /* remove any sysfs entries */ 1364 if (regulator->dev) 1365 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1366 kfree(regulator->supply_name); 1367 list_del(®ulator->list); 1368 kfree(regulator); 1369 1370 rdev->open_count--; 1371 rdev->exclusive = 0; 1372 1373 module_put(rdev->owner); 1374 mutex_unlock(®ulator_list_mutex); 1375} 1376EXPORT_SYMBOL_GPL(regulator_put); 1377 1378static int devm_regulator_match(struct device *dev, void *res, void *data) 1379{ 1380 struct regulator **r = res; 1381 if (!r || !*r) { 1382 WARN_ON(!r || !*r); 1383 return 0; 1384 } 1385 return *r == data; 1386} 1387 1388/** 1389 * devm_regulator_put - Resource managed regulator_put() 1390 * @regulator: regulator to free 1391 * 1392 * Deallocate a regulator allocated with devm_regulator_get(). Normally 1393 * this function will not need to be called and the resource management 1394 * code will ensure that the resource is freed. 1395 */ 1396void devm_regulator_put(struct regulator *regulator) 1397{ 1398 int rc; 1399 1400 rc = devres_release(regulator->dev, devm_regulator_release, 1401 devm_regulator_match, regulator); 1402 if (rc != 0) 1403 WARN_ON(rc); 1404} 1405EXPORT_SYMBOL_GPL(devm_regulator_put); 1406 1407/* locks held by regulator_enable() */ 1408static int _regulator_enable(struct regulator_dev *rdev) 1409{ 1410 int ret, delay; 1411 1412 /* check voltage and requested load before enabling */ 1413 if (rdev->constraints && 1414 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1415 drms_uA_update(rdev); 1416 1417 if (rdev->use_count == 0) { 1418 /* The regulator may on if it's not switchable or left on */ 1419 ret = _regulator_is_enabled(rdev); 1420 if (ret == -EINVAL || ret == 0) { 1421 if (!_regulator_can_change_status(rdev)) 1422 return -EPERM; 1423 1424 if (!rdev->desc->ops->enable) 1425 return -EINVAL; 1426 1427 /* Query before enabling in case configuration 1428 * dependent. */ 1429 ret = _regulator_get_enable_time(rdev); 1430 if (ret >= 0) { 1431 delay = ret; 1432 } else { 1433 rdev_warn(rdev, "enable_time() failed: %d\n", 1434 ret); 1435 delay = 0; 1436 } 1437 1438 trace_regulator_enable(rdev_get_name(rdev)); 1439 1440 /* Allow the regulator to ramp; it would be useful 1441 * to extend this for bulk operations so that the 1442 * regulators can ramp together. */ 1443 ret = rdev->desc->ops->enable(rdev); 1444 if (ret < 0) 1445 return ret; 1446 1447 trace_regulator_enable_delay(rdev_get_name(rdev)); 1448 1449 if (delay >= 1000) { 1450 mdelay(delay / 1000); 1451 udelay(delay % 1000); 1452 } else if (delay) { 1453 udelay(delay); 1454 } 1455 1456 trace_regulator_enable_complete(rdev_get_name(rdev)); 1457 1458 } else if (ret < 0) { 1459 rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1460 return ret; 1461 } 1462 /* Fallthrough on positive return values - already enabled */ 1463 } 1464 1465 rdev->use_count++; 1466 1467 return 0; 1468} 1469 1470/** 1471 * regulator_enable - enable regulator output 1472 * @regulator: regulator source 1473 * 1474 * Request that the regulator be enabled with the regulator output at 1475 * the predefined voltage or current value. Calls to regulator_enable() 1476 * must be balanced with calls to regulator_disable(). 1477 * 1478 * NOTE: the output value can be set by other drivers, boot loader or may be 1479 * hardwired in the regulator. 1480 */ 1481int regulator_enable(struct regulator *regulator) 1482{ 1483 struct regulator_dev *rdev = regulator->rdev; 1484 int ret = 0; 1485 1486 if (regulator->always_on) 1487 return 0; 1488 1489 if (rdev->supply) { 1490 ret = regulator_enable(rdev->supply); 1491 if (ret != 0) 1492 return ret; 1493 } 1494 1495 mutex_lock(&rdev->mutex); 1496 ret = _regulator_enable(rdev); 1497 mutex_unlock(&rdev->mutex); 1498 1499 if (ret != 0 && rdev->supply) 1500 regulator_disable(rdev->supply); 1501 1502 return ret; 1503} 1504EXPORT_SYMBOL_GPL(regulator_enable); 1505 1506/* locks held by regulator_disable() */ 1507static int _regulator_disable(struct regulator_dev *rdev) 1508{ 1509 int ret = 0; 1510 1511 if (WARN(rdev->use_count <= 0, 1512 "unbalanced disables for %s\n", rdev_get_name(rdev))) 1513 return -EIO; 1514 1515 /* are we the last user and permitted to disable ? */ 1516 if (rdev->use_count == 1 && 1517 (rdev->constraints && !rdev->constraints->always_on)) { 1518 1519 /* we are last user */ 1520 if (_regulator_can_change_status(rdev) && 1521 rdev->desc->ops->disable) { 1522 trace_regulator_disable(rdev_get_name(rdev)); 1523 1524 ret = rdev->desc->ops->disable(rdev); 1525 if (ret < 0) { 1526 rdev_err(rdev, "failed to disable\n"); 1527 return ret; 1528 } 1529 1530 trace_regulator_disable_complete(rdev_get_name(rdev)); 1531 1532 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 1533 NULL); 1534 } 1535 1536 rdev->use_count = 0; 1537 } else if (rdev->use_count > 1) { 1538 1539 if (rdev->constraints && 1540 (rdev->constraints->valid_ops_mask & 1541 REGULATOR_CHANGE_DRMS)) 1542 drms_uA_update(rdev); 1543 1544 rdev->use_count--; 1545 } 1546 1547 return ret; 1548} 1549 1550/** 1551 * regulator_disable - disable regulator output 1552 * @regulator: regulator source 1553 * 1554 * Disable the regulator output voltage or current. Calls to 1555 * regulator_enable() must be balanced with calls to 1556 * regulator_disable(). 1557 * 1558 * NOTE: this will only disable the regulator output if no other consumer 1559 * devices have it enabled, the regulator device supports disabling and 1560 * machine constraints permit this operation. 1561 */ 1562int regulator_disable(struct regulator *regulator) 1563{ 1564 struct regulator_dev *rdev = regulator->rdev; 1565 int ret = 0; 1566 1567 if (regulator->always_on) 1568 return 0; 1569 1570 mutex_lock(&rdev->mutex); 1571 ret = _regulator_disable(rdev); 1572 mutex_unlock(&rdev->mutex); 1573 1574 if (ret == 0 && rdev->supply) 1575 regulator_disable(rdev->supply); 1576 1577 return ret; 1578} 1579EXPORT_SYMBOL_GPL(regulator_disable); 1580 1581/* locks held by regulator_force_disable() */ 1582static int _regulator_force_disable(struct regulator_dev *rdev) 1583{ 1584 int ret = 0; 1585 1586 /* force disable */ 1587 if (rdev->desc->ops->disable) { 1588 /* ah well, who wants to live forever... */ 1589 ret = rdev->desc->ops->disable(rdev); 1590 if (ret < 0) { 1591 rdev_err(rdev, "failed to force disable\n"); 1592 return ret; 1593 } 1594 /* notify other consumers that power has been forced off */ 1595 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 1596 REGULATOR_EVENT_DISABLE, NULL); 1597 } 1598 1599 return ret; 1600} 1601 1602/** 1603 * regulator_force_disable - force disable regulator output 1604 * @regulator: regulator source 1605 * 1606 * Forcibly disable the regulator output voltage or current. 1607 * NOTE: this *will* disable the regulator output even if other consumer 1608 * devices have it enabled. This should be used for situations when device 1609 * damage will likely occur if the regulator is not disabled (e.g. over temp). 1610 */ 1611int regulator_force_disable(struct regulator *regulator) 1612{ 1613 struct regulator_dev *rdev = regulator->rdev; 1614 int ret; 1615 1616 mutex_lock(&rdev->mutex); 1617 regulator->uA_load = 0; 1618 ret = _regulator_force_disable(regulator->rdev); 1619 mutex_unlock(&rdev->mutex); 1620 1621 if (rdev->supply) 1622 while (rdev->open_count--) 1623 regulator_disable(rdev->supply); 1624 1625 return ret; 1626} 1627EXPORT_SYMBOL_GPL(regulator_force_disable); 1628 1629static void regulator_disable_work(struct work_struct *work) 1630{ 1631 struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1632 disable_work.work); 1633 int count, i, ret; 1634 1635 mutex_lock(&rdev->mutex); 1636 1637 BUG_ON(!rdev->deferred_disables); 1638 1639 count = rdev->deferred_disables; 1640 rdev->deferred_disables = 0; 1641 1642 for (i = 0; i < count; i++) { 1643 ret = _regulator_disable(rdev); 1644 if (ret != 0) 1645 rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1646 } 1647 1648 mutex_unlock(&rdev->mutex); 1649 1650 if (rdev->supply) { 1651 for (i = 0; i < count; i++) { 1652 ret = regulator_disable(rdev->supply); 1653 if (ret != 0) { 1654 rdev_err(rdev, 1655 "Supply disable failed: %d\n", ret); 1656 } 1657 } 1658 } 1659} 1660 1661/** 1662 * regulator_disable_deferred - disable regulator output with delay 1663 * @regulator: regulator source 1664 * @ms: miliseconds until the regulator is disabled 1665 * 1666 * Execute regulator_disable() on the regulator after a delay. This 1667 * is intended for use with devices that require some time to quiesce. 1668 * 1669 * NOTE: this will only disable the regulator output if no other consumer 1670 * devices have it enabled, the regulator device supports disabling and 1671 * machine constraints permit this operation. 1672 */ 1673int regulator_disable_deferred(struct regulator *regulator, int ms) 1674{ 1675 struct regulator_dev *rdev = regulator->rdev; 1676 int ret; 1677 1678 if (regulator->always_on) 1679 return 0; 1680 1681 mutex_lock(&rdev->mutex); 1682 rdev->deferred_disables++; 1683 mutex_unlock(&rdev->mutex); 1684 1685 ret = schedule_delayed_work(&rdev->disable_work, 1686 msecs_to_jiffies(ms)); 1687 if (ret < 0) 1688 return ret; 1689 else 1690 return 0; 1691} 1692EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1693 1694/** 1695 * regulator_is_enabled_regmap - standard is_enabled() for regmap users 1696 * 1697 * @rdev: regulator to operate on 1698 * 1699 * Regulators that use regmap for their register I/O can set the 1700 * enable_reg and enable_mask fields in their descriptor and then use 1701 * this as their is_enabled operation, saving some code. 1702 */ 1703int regulator_is_enabled_regmap(struct regulator_dev *rdev) 1704{ 1705 unsigned int val; 1706 int ret; 1707 1708 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val); 1709 if (ret != 0) 1710 return ret; 1711 1712 return (val & rdev->desc->enable_mask) != 0; 1713} 1714EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); 1715 1716/** 1717 * regulator_enable_regmap - standard enable() for regmap users 1718 * 1719 * @rdev: regulator to operate on 1720 * 1721 * Regulators that use regmap for their register I/O can set the 1722 * enable_reg and enable_mask fields in their descriptor and then use 1723 * this as their enable() operation, saving some code. 1724 */ 1725int regulator_enable_regmap(struct regulator_dev *rdev) 1726{ 1727 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1728 rdev->desc->enable_mask, 1729 rdev->desc->enable_mask); 1730} 1731EXPORT_SYMBOL_GPL(regulator_enable_regmap); 1732 1733/** 1734 * regulator_disable_regmap - standard disable() for regmap users 1735 * 1736 * @rdev: regulator to operate on 1737 * 1738 * Regulators that use regmap for their register I/O can set the 1739 * enable_reg and enable_mask fields in their descriptor and then use 1740 * this as their disable() operation, saving some code. 1741 */ 1742int regulator_disable_regmap(struct regulator_dev *rdev) 1743{ 1744 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, 1745 rdev->desc->enable_mask, 0); 1746} 1747EXPORT_SYMBOL_GPL(regulator_disable_regmap); 1748 1749static int _regulator_is_enabled(struct regulator_dev *rdev) 1750{ 1751 /* If we don't know then assume that the regulator is always on */ 1752 if (!rdev->desc->ops->is_enabled) 1753 return 1; 1754 1755 return rdev->desc->ops->is_enabled(rdev); 1756} 1757 1758/** 1759 * regulator_is_enabled - is the regulator output enabled 1760 * @regulator: regulator source 1761 * 1762 * Returns positive if the regulator driver backing the source/client 1763 * has requested that the device be enabled, zero if it hasn't, else a 1764 * negative errno code. 1765 * 1766 * Note that the device backing this regulator handle can have multiple 1767 * users, so it might be enabled even if regulator_enable() was never 1768 * called for this particular source. 1769 */ 1770int regulator_is_enabled(struct regulator *regulator) 1771{ 1772 int ret; 1773 1774 if (regulator->always_on) 1775 return 1; 1776 1777 mutex_lock(®ulator->rdev->mutex); 1778 ret = _regulator_is_enabled(regulator->rdev); 1779 mutex_unlock(®ulator->rdev->mutex); 1780 1781 return ret; 1782} 1783EXPORT_SYMBOL_GPL(regulator_is_enabled); 1784 1785/** 1786 * regulator_count_voltages - count regulator_list_voltage() selectors 1787 * @regulator: regulator source 1788 * 1789 * Returns number of selectors, or negative errno. Selectors are 1790 * numbered starting at zero, and typically correspond to bitfields 1791 * in hardware registers. 1792 */ 1793int regulator_count_voltages(struct regulator *regulator) 1794{ 1795 struct regulator_dev *rdev = regulator->rdev; 1796 1797 return rdev->desc->n_voltages ? : -EINVAL; 1798} 1799EXPORT_SYMBOL_GPL(regulator_count_voltages); 1800 1801/** 1802 * regulator_list_voltage_linear - List voltages with simple calculation 1803 * 1804 * @rdev: Regulator device 1805 * @selector: Selector to convert into a voltage 1806 * 1807 * Regulators with a simple linear mapping between voltages and 1808 * selectors can set min_uV and uV_step in the regulator descriptor 1809 * and then use this function as their list_voltage() operation, 1810 */ 1811int regulator_list_voltage_linear(struct regulator_dev *rdev, 1812 unsigned int selector) 1813{ 1814 if (selector >= rdev->desc->n_voltages) 1815 return -EINVAL; 1816 1817 return rdev->desc->min_uV + (rdev->desc->uV_step * selector); 1818} 1819EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); 1820 1821/** 1822 * regulator_list_voltage_table - List voltages with table based mapping 1823 * 1824 * @rdev: Regulator device 1825 * @selector: Selector to convert into a voltage 1826 * 1827 * Regulators with table based mapping between voltages and 1828 * selectors can set volt_table in the regulator descriptor 1829 * and then use this function as their list_voltage() operation. 1830 */ 1831int regulator_list_voltage_table(struct regulator_dev *rdev, 1832 unsigned int selector) 1833{ 1834 if (!rdev->desc->volt_table) { 1835 BUG_ON(!rdev->desc->volt_table); 1836 return -EINVAL; 1837 } 1838 1839 if (selector >= rdev->desc->n_voltages) 1840 return -EINVAL; 1841 1842 return rdev->desc->volt_table[selector]; 1843} 1844EXPORT_SYMBOL_GPL(regulator_list_voltage_table); 1845 1846/** 1847 * regulator_list_voltage - enumerate supported voltages 1848 * @regulator: regulator source 1849 * @selector: identify voltage to list 1850 * Context: can sleep 1851 * 1852 * Returns a voltage that can be passed to @regulator_set_voltage(), 1853 * zero if this selector code can't be used on this system, or a 1854 * negative errno. 1855 */ 1856int regulator_list_voltage(struct regulator *regulator, unsigned selector) 1857{ 1858 struct regulator_dev *rdev = regulator->rdev; 1859 struct regulator_ops *ops = rdev->desc->ops; 1860 int ret; 1861 1862 if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 1863 return -EINVAL; 1864 1865 mutex_lock(&rdev->mutex); 1866 ret = ops->list_voltage(rdev, selector); 1867 mutex_unlock(&rdev->mutex); 1868 1869 if (ret > 0) { 1870 if (ret < rdev->constraints->min_uV) 1871 ret = 0; 1872 else if (ret > rdev->constraints->max_uV) 1873 ret = 0; 1874 } 1875 1876 return ret; 1877} 1878EXPORT_SYMBOL_GPL(regulator_list_voltage); 1879 1880/** 1881 * regulator_is_supported_voltage - check if a voltage range can be supported 1882 * 1883 * @regulator: Regulator to check. 1884 * @min_uV: Minimum required voltage in uV. 1885 * @max_uV: Maximum required voltage in uV. 1886 * 1887 * Returns a boolean or a negative error code. 1888 */ 1889int regulator_is_supported_voltage(struct regulator *regulator, 1890 int min_uV, int max_uV) 1891{ 1892 struct regulator_dev *rdev = regulator->rdev; 1893 int i, voltages, ret; 1894 1895 /* If we can't change voltage check the current voltage */ 1896 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1897 ret = regulator_get_voltage(regulator); 1898 if (ret >= 0) 1899 return (min_uV >= ret && ret <= max_uV); 1900 else 1901 return ret; 1902 } 1903 1904 ret = regulator_count_voltages(regulator); 1905 if (ret < 0) 1906 return ret; 1907 voltages = ret; 1908 1909 for (i = 0; i < voltages; i++) { 1910 ret = regulator_list_voltage(regulator, i); 1911 1912 if (ret >= min_uV && ret <= max_uV) 1913 return 1; 1914 } 1915 1916 return 0; 1917} 1918EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1919 1920/** 1921 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users 1922 * 1923 * @rdev: regulator to operate on 1924 * 1925 * Regulators that use regmap for their register I/O can set the 1926 * vsel_reg and vsel_mask fields in their descriptor and then use this 1927 * as their get_voltage_vsel operation, saving some code. 1928 */ 1929int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev) 1930{ 1931 unsigned int val; 1932 int ret; 1933 1934 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val); 1935 if (ret != 0) 1936 return ret; 1937 1938 val &= rdev->desc->vsel_mask; 1939 val >>= ffs(rdev->desc->vsel_mask) - 1; 1940 1941 return val; 1942} 1943EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap); 1944 1945/** 1946 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users 1947 * 1948 * @rdev: regulator to operate on 1949 * @sel: Selector to set 1950 * 1951 * Regulators that use regmap for their register I/O can set the 1952 * vsel_reg and vsel_mask fields in their descriptor and then use this 1953 * as their set_voltage_vsel operation, saving some code. 1954 */ 1955int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel) 1956{ 1957 sel <<= ffs(rdev->desc->vsel_mask) - 1; 1958 1959 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg, 1960 rdev->desc->vsel_mask, sel); 1961} 1962EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap); 1963 1964/** 1965 * regulator_map_voltage_iterate - map_voltage() based on list_voltage() 1966 * 1967 * @rdev: Regulator to operate on 1968 * @min_uV: Lower bound for voltage 1969 * @max_uV: Upper bound for voltage 1970 * 1971 * Drivers implementing set_voltage_sel() and list_voltage() can use 1972 * this as their map_voltage() operation. It will find a suitable 1973 * voltage by calling list_voltage() until it gets something in bounds 1974 * for the requested voltages. 1975 */ 1976int regulator_map_voltage_iterate(struct regulator_dev *rdev, 1977 int min_uV, int max_uV) 1978{ 1979 int best_val = INT_MAX; 1980 int selector = 0; 1981 int i, ret; 1982 1983 /* Find the smallest voltage that falls within the specified 1984 * range. 1985 */ 1986 for (i = 0; i < rdev->desc->n_voltages; i++) { 1987 ret = rdev->desc->ops->list_voltage(rdev, i); 1988 if (ret < 0) 1989 continue; 1990 1991 if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1992 best_val = ret; 1993 selector = i; 1994 } 1995 } 1996 1997 if (best_val != INT_MAX) 1998 return selector; 1999 else 2000 return -EINVAL; 2001} 2002EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); 2003 2004/** 2005 * regulator_map_voltage_linear - map_voltage() for simple linear mappings 2006 * 2007 * @rdev: Regulator to operate on 2008 * @min_uV: Lower bound for voltage 2009 * @max_uV: Upper bound for voltage 2010 * 2011 * Drivers providing min_uV and uV_step in their regulator_desc can 2012 * use this as their map_voltage() operation. 2013 */ 2014int regulator_map_voltage_linear(struct regulator_dev *rdev, 2015 int min_uV, int max_uV) 2016{ 2017 int ret, voltage; 2018 2019 if (!rdev->desc->uV_step) { 2020 BUG_ON(!rdev->desc->uV_step); 2021 return -EINVAL; 2022 } 2023 2024 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); 2025 if (ret < 0) 2026 return ret; 2027 2028 /* Map back into a voltage to verify we're still in bounds */ 2029 voltage = rdev->desc->ops->list_voltage(rdev, ret); 2030 if (voltage < min_uV || voltage > max_uV) 2031 return -EINVAL; 2032 2033 return ret; 2034} 2035EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); 2036 2037static int _regulator_do_set_voltage(struct regulator_dev *rdev, 2038 int min_uV, int max_uV) 2039{ 2040 int ret; 2041 int delay = 0; 2042 int best_val = 0; 2043 unsigned int selector; 2044 int old_selector = -1; 2045 2046 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 2047 2048 min_uV += rdev->constraints->uV_offset; 2049 max_uV += rdev->constraints->uV_offset; 2050 2051 /* 2052 * If we can't obtain the old selector there is not enough 2053 * info to call set_voltage_time_sel(). 2054 */ 2055 if (_regulator_is_enabled(rdev) && 2056 rdev->desc->ops->set_voltage_time_sel && 2057 rdev->desc->ops->get_voltage_sel) { 2058 old_selector = rdev->desc->ops->get_voltage_sel(rdev); 2059 if (old_selector < 0) 2060 return old_selector; 2061 } 2062 2063 if (rdev->desc->ops->set_voltage) { 2064 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 2065 &selector); 2066 2067 if (ret >= 0) { 2068 if (rdev->desc->ops->list_voltage) 2069 best_val = rdev->desc->ops->list_voltage(rdev, 2070 selector); 2071 else 2072 best_val = _regulator_get_voltage(rdev); 2073 } 2074 2075 } else if (rdev->desc->ops->set_voltage_sel) { 2076 if (rdev->desc->ops->map_voltage) { 2077 ret = rdev->desc->ops->map_voltage(rdev, min_uV, 2078 max_uV); 2079 } else { 2080 if (rdev->desc->ops->list_voltage == 2081 regulator_list_voltage_linear) 2082 ret = regulator_map_voltage_linear(rdev, 2083 min_uV, max_uV); 2084 else 2085 ret = regulator_map_voltage_iterate(rdev, 2086 min_uV, max_uV); 2087 } 2088 2089 if (ret >= 0) { 2090 best_val = rdev->desc->ops->list_voltage(rdev, ret); 2091 if (min_uV <= best_val && max_uV >= best_val) { 2092 selector = ret; 2093 ret = rdev->desc->ops->set_voltage_sel(rdev, 2094 ret); 2095 } else { 2096 ret = -EINVAL; 2097 } 2098 } 2099 } else { 2100 ret = -EINVAL; 2101 } 2102 2103 /* Call set_voltage_time_sel if successfully obtained old_selector */ 2104 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 && 2105 rdev->desc->ops->set_voltage_time_sel) { 2106 2107 delay = rdev->desc->ops->set_voltage_time_sel(rdev, 2108 old_selector, selector); 2109 if (delay < 0) { 2110 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", 2111 delay); 2112 delay = 0; 2113 } 2114 2115 /* Insert any necessary delays */ 2116 if (delay >= 1000) { 2117 mdelay(delay / 1000); 2118 udelay(delay % 1000); 2119 } else if (delay) { 2120 udelay(delay); 2121 } 2122 } 2123 2124 if (ret == 0 && best_val >= 0) 2125 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 2126 (void *)best_val); 2127 2128 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val); 2129 2130 return ret; 2131} 2132 2133/** 2134 * regulator_set_voltage - set regulator output voltage 2135 * @regulator: regulator source 2136 * @min_uV: Minimum required voltage in uV 2137 * @max_uV: Maximum acceptable voltage in uV 2138 * 2139 * Sets a voltage regulator to the desired output voltage. This can be set 2140 * during any regulator state. IOW, regulator can be disabled or enabled. 2141 * 2142 * If the regulator is enabled then the voltage will change to the new value 2143 * immediately otherwise if the regulator is disabled the regulator will 2144 * output at the new voltage when enabled. 2145 * 2146 * NOTE: If the regulator is shared between several devices then the lowest 2147 * request voltage that meets the system constraints will be used. 2148 * Regulator system constraints must be set for this regulator before 2149 * calling this function otherwise this call will fail. 2150 */ 2151int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 2152{ 2153 struct regulator_dev *rdev = regulator->rdev; 2154 int ret = 0; 2155 2156 mutex_lock(&rdev->mutex); 2157 2158 /* If we're setting the same range as last time the change 2159 * should be a noop (some cpufreq implementations use the same 2160 * voltage for multiple frequencies, for example). 2161 */ 2162 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 2163 goto out; 2164 2165 /* sanity check */ 2166 if (!rdev->desc->ops->set_voltage && 2167 !rdev->desc->ops->set_voltage_sel) { 2168 ret = -EINVAL; 2169 goto out; 2170 } 2171 2172 /* constraints check */ 2173 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2174 if (ret < 0) 2175 goto out; 2176 regulator->min_uV = min_uV; 2177 regulator->max_uV = max_uV; 2178 2179 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2180 if (ret < 0) 2181 goto out; 2182 2183 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2184 2185out: 2186 mutex_unlock(&rdev->mutex); 2187 return ret; 2188} 2189EXPORT_SYMBOL_GPL(regulator_set_voltage); 2190 2191/** 2192 * regulator_set_voltage_time - get raise/fall time 2193 * @regulator: regulator source 2194 * @old_uV: starting voltage in microvolts 2195 * @new_uV: target voltage in microvolts 2196 * 2197 * Provided with the starting and ending voltage, this function attempts to 2198 * calculate the time in microseconds required to rise or fall to this new 2199 * voltage. 2200 */ 2201int regulator_set_voltage_time(struct regulator *regulator, 2202 int old_uV, int new_uV) 2203{ 2204 struct regulator_dev *rdev = regulator->rdev; 2205 struct regulator_ops *ops = rdev->desc->ops; 2206 int old_sel = -1; 2207 int new_sel = -1; 2208 int voltage; 2209 int i; 2210 2211 /* Currently requires operations to do this */ 2212 if (!ops->list_voltage || !ops->set_voltage_time_sel 2213 || !rdev->desc->n_voltages) 2214 return -EINVAL; 2215 2216 for (i = 0; i < rdev->desc->n_voltages; i++) { 2217 /* We only look for exact voltage matches here */ 2218 voltage = regulator_list_voltage(regulator, i); 2219 if (voltage < 0) 2220 return -EINVAL; 2221 if (voltage == 0) 2222 continue; 2223 if (voltage == old_uV) 2224 old_sel = i; 2225 if (voltage == new_uV) 2226 new_sel = i; 2227 } 2228 2229 if (old_sel < 0 || new_sel < 0) 2230 return -EINVAL; 2231 2232 return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 2233} 2234EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 2235 2236/** 2237 * regulator_sync_voltage - re-apply last regulator output voltage 2238 * @regulator: regulator source 2239 * 2240 * Re-apply the last configured voltage. This is intended to be used 2241 * where some external control source the consumer is cooperating with 2242 * has caused the configured voltage to change. 2243 */ 2244int regulator_sync_voltage(struct regulator *regulator) 2245{ 2246 struct regulator_dev *rdev = regulator->rdev; 2247 int ret, min_uV, max_uV; 2248 2249 mutex_lock(&rdev->mutex); 2250 2251 if (!rdev->desc->ops->set_voltage && 2252 !rdev->desc->ops->set_voltage_sel) { 2253 ret = -EINVAL; 2254 goto out; 2255 } 2256 2257 /* This is only going to work if we've had a voltage configured. */ 2258 if (!regulator->min_uV && !regulator->max_uV) { 2259 ret = -EINVAL; 2260 goto out; 2261 } 2262 2263 min_uV = regulator->min_uV; 2264 max_uV = regulator->max_uV; 2265 2266 /* This should be a paranoia check... */ 2267 ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2268 if (ret < 0) 2269 goto out; 2270 2271 ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2272 if (ret < 0) 2273 goto out; 2274 2275 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2276 2277out: 2278 mutex_unlock(&rdev->mutex); 2279 return ret; 2280} 2281EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2282 2283static int _regulator_get_voltage(struct regulator_dev *rdev) 2284{ 2285 int sel, ret; 2286 2287 if (rdev->desc->ops->get_voltage_sel) { 2288 sel = rdev->desc->ops->get_voltage_sel(rdev); 2289 if (sel < 0) 2290 return sel; 2291 ret = rdev->desc->ops->list_voltage(rdev, sel); 2292 } else if (rdev->desc->ops->get_voltage) { 2293 ret = rdev->desc->ops->get_voltage(rdev); 2294 } else { 2295 return -EINVAL; 2296 } 2297 2298 if (ret < 0) 2299 return ret; 2300 return ret - rdev->constraints->uV_offset; 2301} 2302 2303/** 2304 * regulator_get_voltage - get regulator output voltage 2305 * @regulator: regulator source 2306 * 2307 * This returns the current regulator voltage in uV. 2308 * 2309 * NOTE: If the regulator is disabled it will return the voltage value. This 2310 * function should not be used to determine regulator state. 2311 */ 2312int regulator_get_voltage(struct regulator *regulator) 2313{ 2314 int ret; 2315 2316 mutex_lock(®ulator->rdev->mutex); 2317 2318 ret = _regulator_get_voltage(regulator->rdev); 2319 2320 mutex_unlock(®ulator->rdev->mutex); 2321 2322 return ret; 2323} 2324EXPORT_SYMBOL_GPL(regulator_get_voltage); 2325 2326/** 2327 * regulator_set_current_limit - set regulator output current limit 2328 * @regulator: regulator source 2329 * @min_uA: Minimuum supported current in uA 2330 * @max_uA: Maximum supported current in uA 2331 * 2332 * Sets current sink to the desired output current. This can be set during 2333 * any regulator state. IOW, regulator can be disabled or enabled. 2334 * 2335 * If the regulator is enabled then the current will change to the new value 2336 * immediately otherwise if the regulator is disabled the regulator will 2337 * output at the new current when enabled. 2338 * 2339 * NOTE: Regulator system constraints must be set for this regulator before 2340 * calling this function otherwise this call will fail. 2341 */ 2342int regulator_set_current_limit(struct regulator *regulator, 2343 int min_uA, int max_uA) 2344{ 2345 struct regulator_dev *rdev = regulator->rdev; 2346 int ret; 2347 2348 mutex_lock(&rdev->mutex); 2349 2350 /* sanity check */ 2351 if (!rdev->desc->ops->set_current_limit) { 2352 ret = -EINVAL; 2353 goto out; 2354 } 2355 2356 /* constraints check */ 2357 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2358 if (ret < 0) 2359 goto out; 2360 2361 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2362out: 2363 mutex_unlock(&rdev->mutex); 2364 return ret; 2365} 2366EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2367 2368static int _regulator_get_current_limit(struct regulator_dev *rdev) 2369{ 2370 int ret; 2371 2372 mutex_lock(&rdev->mutex); 2373 2374 /* sanity check */ 2375 if (!rdev->desc->ops->get_current_limit) { 2376 ret = -EINVAL; 2377 goto out; 2378 } 2379 2380 ret = rdev->desc->ops->get_current_limit(rdev); 2381out: 2382 mutex_unlock(&rdev->mutex); 2383 return ret; 2384} 2385 2386/** 2387 * regulator_get_current_limit - get regulator output current 2388 * @regulator: regulator source 2389 * 2390 * This returns the current supplied by the specified current sink in uA. 2391 * 2392 * NOTE: If the regulator is disabled it will return the current value. This 2393 * function should not be used to determine regulator state. 2394 */ 2395int regulator_get_current_limit(struct regulator *regulator) 2396{ 2397 return _regulator_get_current_limit(regulator->rdev); 2398} 2399EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2400 2401/** 2402 * regulator_set_mode - set regulator operating mode 2403 * @regulator: regulator source 2404 * @mode: operating mode - one of the REGULATOR_MODE constants 2405 * 2406 * Set regulator operating mode to increase regulator efficiency or improve 2407 * regulation performance. 2408 * 2409 * NOTE: Regulator system constraints must be set for this regulator before 2410 * calling this function otherwise this call will fail. 2411 */ 2412int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2413{ 2414 struct regulator_dev *rdev = regulator->rdev; 2415 int ret; 2416 int regulator_curr_mode; 2417 2418 mutex_lock(&rdev->mutex); 2419 2420 /* sanity check */ 2421 if (!rdev->desc->ops->set_mode) { 2422 ret = -EINVAL; 2423 goto out; 2424 } 2425 2426 /* return if the same mode is requested */ 2427 if (rdev->desc->ops->get_mode) { 2428 regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2429 if (regulator_curr_mode == mode) { 2430 ret = 0; 2431 goto out; 2432 } 2433 } 2434 2435 /* constraints check */ 2436 ret = regulator_mode_constrain(rdev, &mode); 2437 if (ret < 0) 2438 goto out; 2439 2440 ret = rdev->desc->ops->set_mode(rdev, mode); 2441out: 2442 mutex_unlock(&rdev->mutex); 2443 return ret; 2444} 2445EXPORT_SYMBOL_GPL(regulator_set_mode); 2446 2447static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2448{ 2449 int ret; 2450 2451 mutex_lock(&rdev->mutex); 2452 2453 /* sanity check */ 2454 if (!rdev->desc->ops->get_mode) { 2455 ret = -EINVAL; 2456 goto out; 2457 } 2458 2459 ret = rdev->desc->ops->get_mode(rdev); 2460out: 2461 mutex_unlock(&rdev->mutex); 2462 return ret; 2463} 2464 2465/** 2466 * regulator_get_mode - get regulator operating mode 2467 * @regulator: regulator source 2468 * 2469 * Get the current regulator operating mode. 2470 */ 2471unsigned int regulator_get_mode(struct regulator *regulator) 2472{ 2473 return _regulator_get_mode(regulator->rdev); 2474} 2475EXPORT_SYMBOL_GPL(regulator_get_mode); 2476 2477/** 2478 * regulator_set_optimum_mode - set regulator optimum operating mode 2479 * @regulator: regulator source 2480 * @uA_load: load current 2481 * 2482 * Notifies the regulator core of a new device load. This is then used by 2483 * DRMS (if enabled by constraints) to set the most efficient regulator 2484 * operating mode for the new regulator loading. 2485 * 2486 * Consumer devices notify their supply regulator of the maximum power 2487 * they will require (can be taken from device datasheet in the power 2488 * consumption tables) when they change operational status and hence power 2489 * state. Examples of operational state changes that can affect power 2490 * consumption are :- 2491 * 2492 * o Device is opened / closed. 2493 * o Device I/O is about to begin or has just finished. 2494 * o Device is idling in between work. 2495 * 2496 * This information is also exported via sysfs to userspace. 2497 * 2498 * DRMS will sum the total requested load on the regulator and change 2499 * to the most efficient operating mode if platform constraints allow. 2500 * 2501 * Returns the new regulator mode or error. 2502 */ 2503int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2504{ 2505 struct regulator_dev *rdev = regulator->rdev; 2506 struct regulator *consumer; 2507 int ret, output_uV, input_uV, total_uA_load = 0; 2508 unsigned int mode; 2509 2510 mutex_lock(&rdev->mutex); 2511 2512 /* 2513 * first check to see if we can set modes at all, otherwise just 2514 * tell the consumer everything is OK. 2515 */ 2516 regulator->uA_load = uA_load; 2517 ret = regulator_check_drms(rdev); 2518 if (ret < 0) { 2519 ret = 0; 2520 goto out; 2521 } 2522 2523 if (!rdev->desc->ops->get_optimum_mode) 2524 goto out; 2525 2526 /* 2527 * we can actually do this so any errors are indicators of 2528 * potential real failure. 2529 */ 2530 ret = -EINVAL; 2531 2532 if (!rdev->desc->ops->set_mode) 2533 goto out; 2534 2535 /* get output voltage */ 2536 output_uV = _regulator_get_voltage(rdev); 2537 if (output_uV <= 0) { 2538 rdev_err(rdev, "invalid output voltage found\n"); 2539 goto out; 2540 } 2541 2542 /* get input voltage */ 2543 input_uV = 0; 2544 if (rdev->supply) 2545 input_uV = regulator_get_voltage(rdev->supply); 2546 if (input_uV <= 0) 2547 input_uV = rdev->constraints->input_uV; 2548 if (input_uV <= 0) { 2549 rdev_err(rdev, "invalid input voltage found\n"); 2550 goto out; 2551 } 2552 2553 /* calc total requested load for this regulator */ 2554 list_for_each_entry(consumer, &rdev->consumer_list, list) 2555 total_uA_load += consumer->uA_load; 2556 2557 mode = rdev->desc->ops->get_optimum_mode(rdev, 2558 input_uV, output_uV, 2559 total_uA_load); 2560 ret = regulator_mode_constrain(rdev, &mode); 2561 if (ret < 0) { 2562 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2563 total_uA_load, input_uV, output_uV); 2564 goto out; 2565 } 2566 2567 ret = rdev->desc->ops->set_mode(rdev, mode); 2568 if (ret < 0) { 2569 rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2570 goto out; 2571 } 2572 ret = mode; 2573out: 2574 mutex_unlock(&rdev->mutex); 2575 return ret; 2576} 2577EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2578 2579/** 2580 * regulator_register_notifier - register regulator event notifier 2581 * @regulator: regulator source 2582 * @nb: notifier block 2583 * 2584 * Register notifier block to receive regulator events. 2585 */ 2586int regulator_register_notifier(struct regulator *regulator, 2587 struct notifier_block *nb) 2588{ 2589 return blocking_notifier_chain_register(®ulator->rdev->notifier, 2590 nb); 2591} 2592EXPORT_SYMBOL_GPL(regulator_register_notifier); 2593 2594/** 2595 * regulator_unregister_notifier - unregister regulator event notifier 2596 * @regulator: regulator source 2597 * @nb: notifier block 2598 * 2599 * Unregister regulator event notifier block. 2600 */ 2601int regulator_unregister_notifier(struct regulator *regulator, 2602 struct notifier_block *nb) 2603{ 2604 return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2605 nb); 2606} 2607EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2608 2609/* notify regulator consumers and downstream regulator consumers. 2610 * Note mutex must be held by caller. 2611 */ 2612static void _notifier_call_chain(struct regulator_dev *rdev, 2613 unsigned long event, void *data) 2614{ 2615 /* call rdev chain first */ 2616 blocking_notifier_call_chain(&rdev->notifier, event, data); 2617} 2618 2619/** 2620 * regulator_bulk_get - get multiple regulator consumers 2621 * 2622 * @dev: Device to supply 2623 * @num_consumers: Number of consumers to register 2624 * @consumers: Configuration of consumers; clients are stored here. 2625 * 2626 * @return 0 on success, an errno on failure. 2627 * 2628 * This helper function allows drivers to get several regulator 2629 * consumers in one operation. If any of the regulators cannot be 2630 * acquired then any regulators that were allocated will be freed 2631 * before returning to the caller. 2632 */ 2633int regulator_bulk_get(struct device *dev, int num_consumers, 2634 struct regulator_bulk_data *consumers) 2635{ 2636 int i; 2637 int ret; 2638 2639 for (i = 0; i < num_consumers; i++) 2640 consumers[i].consumer = NULL; 2641 2642 for (i = 0; i < num_consumers; i++) { 2643 consumers[i].consumer = regulator_get(dev, 2644 consumers[i].supply); 2645 if (IS_ERR(consumers[i].consumer)) { 2646 ret = PTR_ERR(consumers[i].consumer); 2647 dev_err(dev, "Failed to get supply '%s': %d\n", 2648 consumers[i].supply, ret); 2649 consumers[i].consumer = NULL; 2650 goto err; 2651 } 2652 } 2653 2654 return 0; 2655 2656err: 2657 while (--i >= 0) 2658 regulator_put(consumers[i].consumer); 2659 2660 return ret; 2661} 2662EXPORT_SYMBOL_GPL(regulator_bulk_get); 2663 2664/** 2665 * devm_regulator_bulk_get - managed get multiple regulator consumers 2666 * 2667 * @dev: Device to supply 2668 * @num_consumers: Number of consumers to register 2669 * @consumers: Configuration of consumers; clients are stored here. 2670 * 2671 * @return 0 on success, an errno on failure. 2672 * 2673 * This helper function allows drivers to get several regulator 2674 * consumers in one operation with management, the regulators will 2675 * automatically be freed when the device is unbound. If any of the 2676 * regulators cannot be acquired then any regulators that were 2677 * allocated will be freed before returning to the caller. 2678 */ 2679int devm_regulator_bulk_get(struct device *dev, int num_consumers, 2680 struct regulator_bulk_data *consumers) 2681{ 2682 int i; 2683 int ret; 2684 2685 for (i = 0; i < num_consumers; i++) 2686 consumers[i].consumer = NULL; 2687 2688 for (i = 0; i < num_consumers; i++) { 2689 consumers[i].consumer = devm_regulator_get(dev, 2690 consumers[i].supply); 2691 if (IS_ERR(consumers[i].consumer)) { 2692 ret = PTR_ERR(consumers[i].consumer); 2693 dev_err(dev, "Failed to get supply '%s': %d\n", 2694 consumers[i].supply, ret); 2695 consumers[i].consumer = NULL; 2696 goto err; 2697 } 2698 } 2699 2700 return 0; 2701 2702err: 2703 for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2704 devm_regulator_put(consumers[i].consumer); 2705 2706 return ret; 2707} 2708EXPORT_SYMBOL_GPL(devm_regulator_bulk_get); 2709 2710static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2711{ 2712 struct regulator_bulk_data *bulk = data; 2713 2714 bulk->ret = regulator_enable(bulk->consumer); 2715} 2716 2717/** 2718 * regulator_bulk_enable - enable multiple regulator consumers 2719 * 2720 * @num_consumers: Number of consumers 2721 * @consumers: Consumer data; clients are stored here. 2722 * @return 0 on success, an errno on failure 2723 * 2724 * This convenience API allows consumers to enable multiple regulator 2725 * clients in a single API call. If any consumers cannot be enabled 2726 * then any others that were enabled will be disabled again prior to 2727 * return. 2728 */ 2729int regulator_bulk_enable(int num_consumers, 2730 struct regulator_bulk_data *consumers) 2731{ 2732 LIST_HEAD(async_domain); 2733 int i; 2734 int ret = 0; 2735 2736 for (i = 0; i < num_consumers; i++) { 2737 if (consumers[i].consumer->always_on) 2738 consumers[i].ret = 0; 2739 else 2740 async_schedule_domain(regulator_bulk_enable_async, 2741 &consumers[i], &async_domain); 2742 } 2743 2744 async_synchronize_full_domain(&async_domain); 2745 2746 /* If any consumer failed we need to unwind any that succeeded */ 2747 for (i = 0; i < num_consumers; i++) { 2748 if (consumers[i].ret != 0) { 2749 ret = consumers[i].ret; 2750 goto err; 2751 } 2752 } 2753 2754 return 0; 2755 2756err: 2757 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2758 while (--i >= 0) 2759 regulator_disable(consumers[i].consumer); 2760 2761 return ret; 2762} 2763EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2764 2765/** 2766 * regulator_bulk_disable - disable multiple regulator consumers 2767 * 2768 * @num_consumers: Number of consumers 2769 * @consumers: Consumer data; clients are stored here. 2770 * @return 0 on success, an errno on failure 2771 * 2772 * This convenience API allows consumers to disable multiple regulator 2773 * clients in a single API call. If any consumers cannot be disabled 2774 * then any others that were disabled will be enabled again prior to 2775 * return. 2776 */ 2777int regulator_bulk_disable(int num_consumers, 2778 struct regulator_bulk_data *consumers) 2779{ 2780 int i; 2781 int ret, r; 2782 2783 for (i = num_consumers - 1; i >= 0; --i) { 2784 ret = regulator_disable(consumers[i].consumer); 2785 if (ret != 0) 2786 goto err; 2787 } 2788 2789 return 0; 2790 2791err: 2792 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2793 for (++i; i < num_consumers; ++i) { 2794 r = regulator_enable(consumers[i].consumer); 2795 if (r != 0) 2796 pr_err("Failed to reename %s: %d\n", 2797 consumers[i].supply, r); 2798 } 2799 2800 return ret; 2801} 2802EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2803 2804/** 2805 * regulator_bulk_force_disable - force disable multiple regulator consumers 2806 * 2807 * @num_consumers: Number of consumers 2808 * @consumers: Consumer data; clients are stored here. 2809 * @return 0 on success, an errno on failure 2810 * 2811 * This convenience API allows consumers to forcibly disable multiple regulator 2812 * clients in a single API call. 2813 * NOTE: This should be used for situations when device damage will 2814 * likely occur if the regulators are not disabled (e.g. over temp). 2815 * Although regulator_force_disable function call for some consumers can 2816 * return error numbers, the function is called for all consumers. 2817 */ 2818int regulator_bulk_force_disable(int num_consumers, 2819 struct regulator_bulk_data *consumers) 2820{ 2821 int i; 2822 int ret; 2823 2824 for (i = 0; i < num_consumers; i++) 2825 consumers[i].ret = 2826 regulator_force_disable(consumers[i].consumer); 2827 2828 for (i = 0; i < num_consumers; i++) { 2829 if (consumers[i].ret != 0) { 2830 ret = consumers[i].ret; 2831 goto out; 2832 } 2833 } 2834 2835 return 0; 2836out: 2837 return ret; 2838} 2839EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2840 2841/** 2842 * regulator_bulk_free - free multiple regulator consumers 2843 * 2844 * @num_consumers: Number of consumers 2845 * @consumers: Consumer data; clients are stored here. 2846 * 2847 * This convenience API allows consumers to free multiple regulator 2848 * clients in a single API call. 2849 */ 2850void regulator_bulk_free(int num_consumers, 2851 struct regulator_bulk_data *consumers) 2852{ 2853 int i; 2854 2855 for (i = 0; i < num_consumers; i++) { 2856 regulator_put(consumers[i].consumer); 2857 consumers[i].consumer = NULL; 2858 } 2859} 2860EXPORT_SYMBOL_GPL(regulator_bulk_free); 2861 2862/** 2863 * regulator_notifier_call_chain - call regulator event notifier 2864 * @rdev: regulator source 2865 * @event: notifier block 2866 * @data: callback-specific data. 2867 * 2868 * Called by regulator drivers to notify clients a regulator event has 2869 * occurred. We also notify regulator clients downstream. 2870 * Note lock must be held by caller. 2871 */ 2872int regulator_notifier_call_chain(struct regulator_dev *rdev, 2873 unsigned long event, void *data) 2874{ 2875 _notifier_call_chain(rdev, event, data); 2876 return NOTIFY_DONE; 2877 2878} 2879EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2880 2881/** 2882 * regulator_mode_to_status - convert a regulator mode into a status 2883 * 2884 * @mode: Mode to convert 2885 * 2886 * Convert a regulator mode into a status. 2887 */ 2888int regulator_mode_to_status(unsigned int mode) 2889{ 2890 switch (mode) { 2891 case REGULATOR_MODE_FAST: 2892 return REGULATOR_STATUS_FAST; 2893 case REGULATOR_MODE_NORMAL: 2894 return REGULATOR_STATUS_NORMAL; 2895 case REGULATOR_MODE_IDLE: 2896 return REGULATOR_STATUS_IDLE; 2897 case REGULATOR_MODE_STANDBY: 2898 return REGULATOR_STATUS_STANDBY; 2899 default: 2900 return 0; 2901 } 2902} 2903EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2904 2905/* 2906 * To avoid cluttering sysfs (and memory) with useless state, only 2907 * create attributes that can be meaningfully displayed. 2908 */ 2909static int add_regulator_attributes(struct regulator_dev *rdev) 2910{ 2911 struct device *dev = &rdev->dev; 2912 struct regulator_ops *ops = rdev->desc->ops; 2913 int status = 0; 2914 2915 /* some attributes need specific methods to be displayed */ 2916 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 2917 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 2918 status = device_create_file(dev, &dev_attr_microvolts); 2919 if (status < 0) 2920 return status; 2921 } 2922 if (ops->get_current_limit) { 2923 status = device_create_file(dev, &dev_attr_microamps); 2924 if (status < 0) 2925 return status; 2926 } 2927 if (ops->get_mode) { 2928 status = device_create_file(dev, &dev_attr_opmode); 2929 if (status < 0) 2930 return status; 2931 } 2932 if (ops->is_enabled) { 2933 status = device_create_file(dev, &dev_attr_state); 2934 if (status < 0) 2935 return status; 2936 } 2937 if (ops->get_status) { 2938 status = device_create_file(dev, &dev_attr_status); 2939 if (status < 0) 2940 return status; 2941 } 2942 2943 /* some attributes are type-specific */ 2944 if (rdev->desc->type == REGULATOR_CURRENT) { 2945 status = device_create_file(dev, &dev_attr_requested_microamps); 2946 if (status < 0) 2947 return status; 2948 } 2949 2950 /* all the other attributes exist to support constraints; 2951 * don't show them if there are no constraints, or if the 2952 * relevant supporting methods are missing. 2953 */ 2954 if (!rdev->constraints) 2955 return status; 2956 2957 /* constraints need specific supporting methods */ 2958 if (ops->set_voltage || ops->set_voltage_sel) { 2959 status = device_create_file(dev, &dev_attr_min_microvolts); 2960 if (status < 0) 2961 return status; 2962 status = device_create_file(dev, &dev_attr_max_microvolts); 2963 if (status < 0) 2964 return status; 2965 } 2966 if (ops->set_current_limit) { 2967 status = device_create_file(dev, &dev_attr_min_microamps); 2968 if (status < 0) 2969 return status; 2970 status = device_create_file(dev, &dev_attr_max_microamps); 2971 if (status < 0) 2972 return status; 2973 } 2974 2975 status = device_create_file(dev, &dev_attr_suspend_standby_state); 2976 if (status < 0) 2977 return status; 2978 status = device_create_file(dev, &dev_attr_suspend_mem_state); 2979 if (status < 0) 2980 return status; 2981 status = device_create_file(dev, &dev_attr_suspend_disk_state); 2982 if (status < 0) 2983 return status; 2984 2985 if (ops->set_suspend_voltage) { 2986 status = device_create_file(dev, 2987 &dev_attr_suspend_standby_microvolts); 2988 if (status < 0) 2989 return status; 2990 status = device_create_file(dev, 2991 &dev_attr_suspend_mem_microvolts); 2992 if (status < 0) 2993 return status; 2994 status = device_create_file(dev, 2995 &dev_attr_suspend_disk_microvolts); 2996 if (status < 0) 2997 return status; 2998 } 2999 3000 if (ops->set_suspend_mode) { 3001 status = device_create_file(dev, 3002 &dev_attr_suspend_standby_mode); 3003 if (status < 0) 3004 return status; 3005 status = device_create_file(dev, 3006 &dev_attr_suspend_mem_mode); 3007 if (status < 0) 3008 return status; 3009 status = device_create_file(dev, 3010 &dev_attr_suspend_disk_mode); 3011 if (status < 0) 3012 return status; 3013 } 3014 3015 return status; 3016} 3017 3018static void rdev_init_debugfs(struct regulator_dev *rdev) 3019{ 3020 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 3021 if (!rdev->debugfs) { 3022 rdev_warn(rdev, "Failed to create debugfs directory\n"); 3023 return; 3024 } 3025 3026 debugfs_create_u32("use_count", 0444, rdev->debugfs, 3027 &rdev->use_count); 3028 debugfs_create_u32("open_count", 0444, rdev->debugfs, 3029 &rdev->open_count); 3030} 3031 3032/** 3033 * regulator_register - register regulator 3034 * @regulator_desc: regulator to register 3035 * @config: runtime configuration for regulator 3036 * 3037 * Called by regulator drivers to register a regulator. 3038 * Returns 0 on success. 3039 */ 3040struct regulator_dev * 3041regulator_register(const struct regulator_desc *regulator_desc, 3042 const struct regulator_config *config) 3043{ 3044 const struct regulation_constraints *constraints = NULL; 3045 const struct regulator_init_data *init_data; 3046 static atomic_t regulator_no = ATOMIC_INIT(0); 3047 struct regulator_dev *rdev; 3048 struct device *dev; 3049 int ret, i; 3050 const char *supply = NULL; 3051 3052 if (regulator_desc == NULL || config == NULL) 3053 return ERR_PTR(-EINVAL); 3054 3055 dev = config->dev; 3056 WARN_ON(!dev); 3057 3058 if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 3059 return ERR_PTR(-EINVAL); 3060 3061 if (regulator_desc->type != REGULATOR_VOLTAGE && 3062 regulator_desc->type != REGULATOR_CURRENT) 3063 return ERR_PTR(-EINVAL); 3064 3065 /* Only one of each should be implemented */ 3066 WARN_ON(regulator_desc->ops->get_voltage && 3067 regulator_desc->ops->get_voltage_sel); 3068 WARN_ON(regulator_desc->ops->set_voltage && 3069 regulator_desc->ops->set_voltage_sel); 3070 3071 /* If we're using selectors we must implement list_voltage. */ 3072 if (regulator_desc->ops->get_voltage_sel && 3073 !regulator_desc->ops->list_voltage) { 3074 return ERR_PTR(-EINVAL); 3075 } 3076 if (regulator_desc->ops->set_voltage_sel && 3077 !regulator_desc->ops->list_voltage) { 3078 return ERR_PTR(-EINVAL); 3079 } 3080 3081 init_data = config->init_data; 3082 3083 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 3084 if (rdev == NULL) 3085 return ERR_PTR(-ENOMEM); 3086 3087 mutex_lock(®ulator_list_mutex); 3088 3089 mutex_init(&rdev->mutex); 3090 rdev->reg_data = config->driver_data; 3091 rdev->owner = regulator_desc->owner; 3092 rdev->desc = regulator_desc; 3093 if (config->regmap) 3094 rdev->regmap = config->regmap; 3095 else 3096 rdev->regmap = dev_get_regmap(dev, NULL); 3097 INIT_LIST_HEAD(&rdev->consumer_list); 3098 INIT_LIST_HEAD(&rdev->list); 3099 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 3100 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 3101 3102 /* preform any regulator specific init */ 3103 if (init_data && init_data->regulator_init) { 3104 ret = init_data->regulator_init(rdev->reg_data); 3105 if (ret < 0) 3106 goto clean; 3107 } 3108 3109 /* register with sysfs */ 3110 rdev->dev.class = ®ulator_class; 3111 rdev->dev.of_node = config->of_node; 3112 rdev->dev.parent = dev; 3113 dev_set_name(&rdev->dev, "regulator.%d", 3114 atomic_inc_return(®ulator_no) - 1); 3115 ret = device_register(&rdev->dev); 3116 if (ret != 0) { 3117 put_device(&rdev->dev); 3118 goto clean; 3119 } 3120 3121 dev_set_drvdata(&rdev->dev, rdev); 3122 3123 /* set regulator constraints */ 3124 if (init_data) 3125 constraints = &init_data->constraints; 3126 3127 ret = set_machine_constraints(rdev, constraints); 3128 if (ret < 0) 3129 goto scrub; 3130 3131 /* add attributes supported by this regulator */ 3132 ret = add_regulator_attributes(rdev); 3133 if (ret < 0) 3134 goto scrub; 3135 3136 if (init_data && init_data->supply_regulator) 3137 supply = init_data->supply_regulator; 3138 else if (regulator_desc->supply_name) 3139 supply = regulator_desc->supply_name; 3140 3141 if (supply) { 3142 struct regulator_dev *r; 3143 3144 r = regulator_dev_lookup(dev, supply, &ret); 3145 3146 if (!r) { 3147 dev_err(dev, "Failed to find supply %s\n", supply); 3148 ret = -EPROBE_DEFER; 3149 goto scrub; 3150 } 3151 3152 ret = set_supply(rdev, r); 3153 if (ret < 0) 3154 goto scrub; 3155 3156 /* Enable supply if rail is enabled */ 3157 if (_regulator_is_enabled(rdev)) { 3158 ret = regulator_enable(rdev->supply); 3159 if (ret < 0) 3160 goto scrub; 3161 } 3162 } 3163 3164 /* add consumers devices */ 3165 if (init_data) { 3166 for (i = 0; i < init_data->num_consumer_supplies; i++) { 3167 ret = set_consumer_device_supply(rdev, 3168 init_data->consumer_supplies[i].dev_name, 3169 init_data->consumer_supplies[i].supply); 3170 if (ret < 0) { 3171 dev_err(dev, "Failed to set supply %s\n", 3172 init_data->consumer_supplies[i].supply); 3173 goto unset_supplies; 3174 } 3175 } 3176 } 3177 3178 list_add(&rdev->list, ®ulator_list); 3179 3180 rdev_init_debugfs(rdev); 3181out: 3182 mutex_unlock(®ulator_list_mutex); 3183 return rdev; 3184 3185unset_supplies: 3186 unset_regulator_supplies(rdev); 3187 3188scrub: 3189 if (rdev->supply) 3190 regulator_put(rdev->supply); 3191 kfree(rdev->constraints); 3192 device_unregister(&rdev->dev); 3193 /* device core frees rdev */ 3194 rdev = ERR_PTR(ret); 3195 goto out; 3196 3197clean: 3198 kfree(rdev); 3199 rdev = ERR_PTR(ret); 3200 goto out; 3201} 3202EXPORT_SYMBOL_GPL(regulator_register); 3203 3204/** 3205 * regulator_unregister - unregister regulator 3206 * @rdev: regulator to unregister 3207 * 3208 * Called by regulator drivers to unregister a regulator. 3209 */ 3210void regulator_unregister(struct regulator_dev *rdev) 3211{ 3212 if (rdev == NULL) 3213 return; 3214 3215 if (rdev->supply) 3216 regulator_put(rdev->supply); 3217 mutex_lock(®ulator_list_mutex); 3218 debugfs_remove_recursive(rdev->debugfs); 3219 flush_work_sync(&rdev->disable_work.work); 3220 WARN_ON(rdev->open_count); 3221 unset_regulator_supplies(rdev); 3222 list_del(&rdev->list); 3223 kfree(rdev->constraints); 3224 device_unregister(&rdev->dev); 3225 mutex_unlock(®ulator_list_mutex); 3226} 3227EXPORT_SYMBOL_GPL(regulator_unregister); 3228 3229/** 3230 * regulator_suspend_prepare - prepare regulators for system wide suspend 3231 * @state: system suspend state 3232 * 3233 * Configure each regulator with it's suspend operating parameters for state. 3234 * This will usually be called by machine suspend code prior to supending. 3235 */ 3236int regulator_suspend_prepare(suspend_state_t state) 3237{ 3238 struct regulator_dev *rdev; 3239 int ret = 0; 3240 3241 /* ON is handled by regulator active state */ 3242 if (state == PM_SUSPEND_ON) 3243 return -EINVAL; 3244 3245 mutex_lock(®ulator_list_mutex); 3246 list_for_each_entry(rdev, ®ulator_list, list) { 3247 3248 mutex_lock(&rdev->mutex); 3249 ret = suspend_prepare(rdev, state); 3250 mutex_unlock(&rdev->mutex); 3251 3252 if (ret < 0) { 3253 rdev_err(rdev, "failed to prepare\n"); 3254 goto out; 3255 } 3256 } 3257out: 3258 mutex_unlock(®ulator_list_mutex); 3259 return ret; 3260} 3261EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 3262 3263/** 3264 * regulator_suspend_finish - resume regulators from system wide suspend 3265 * 3266 * Turn on regulators that might be turned off by regulator_suspend_prepare 3267 * and that should be turned on according to the regulators properties. 3268 */ 3269int regulator_suspend_finish(void) 3270{ 3271 struct regulator_dev *rdev; 3272 int ret = 0, error; 3273 3274 mutex_lock(®ulator_list_mutex); 3275 list_for_each_entry(rdev, ®ulator_list, list) { 3276 struct regulator_ops *ops = rdev->desc->ops; 3277 3278 mutex_lock(&rdev->mutex); 3279 if ((rdev->use_count > 0 || rdev->constraints->always_on) && 3280 ops->enable) { 3281 error = ops->enable(rdev); 3282 if (error) 3283 ret = error; 3284 } else { 3285 if (!has_full_constraints) 3286 goto unlock; 3287 if (!ops->disable) 3288 goto unlock; 3289 if (!_regulator_is_enabled(rdev)) 3290 goto unlock; 3291 3292 error = ops->disable(rdev); 3293 if (error) 3294 ret = error; 3295 } 3296unlock: 3297 mutex_unlock(&rdev->mutex); 3298 } 3299 mutex_unlock(®ulator_list_mutex); 3300 return ret; 3301} 3302EXPORT_SYMBOL_GPL(regulator_suspend_finish); 3303 3304/** 3305 * regulator_has_full_constraints - the system has fully specified constraints 3306 * 3307 * Calling this function will cause the regulator API to disable all 3308 * regulators which have a zero use count and don't have an always_on 3309 * constraint in a late_initcall. 3310 * 3311 * The intention is that this will become the default behaviour in a 3312 * future kernel release so users are encouraged to use this facility 3313 * now. 3314 */ 3315void regulator_has_full_constraints(void) 3316{ 3317 has_full_constraints = 1; 3318} 3319EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 3320 3321/** 3322 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3323 * 3324 * Calling this function will cause the regulator API to provide a 3325 * dummy regulator to consumers if no physical regulator is found, 3326 * allowing most consumers to proceed as though a regulator were 3327 * configured. This allows systems such as those with software 3328 * controllable regulators for the CPU core only to be brought up more 3329 * readily. 3330 */ 3331void regulator_use_dummy_regulator(void) 3332{ 3333 board_wants_dummy_regulator = true; 3334} 3335EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3336 3337/** 3338 * rdev_get_drvdata - get rdev regulator driver data 3339 * @rdev: regulator 3340 * 3341 * Get rdev regulator driver private data. This call can be used in the 3342 * regulator driver context. 3343 */ 3344void *rdev_get_drvdata(struct regulator_dev *rdev) 3345{ 3346 return rdev->reg_data; 3347} 3348EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3349 3350/** 3351 * regulator_get_drvdata - get regulator driver data 3352 * @regulator: regulator 3353 * 3354 * Get regulator driver private data. This call can be used in the consumer 3355 * driver context when non API regulator specific functions need to be called. 3356 */ 3357void *regulator_get_drvdata(struct regulator *regulator) 3358{ 3359 return regulator->rdev->reg_data; 3360} 3361EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3362 3363/** 3364 * regulator_set_drvdata - set regulator driver data 3365 * @regulator: regulator 3366 * @data: data 3367 */ 3368void regulator_set_drvdata(struct regulator *regulator, void *data) 3369{ 3370 regulator->rdev->reg_data = data; 3371} 3372EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3373 3374/** 3375 * regulator_get_id - get regulator ID 3376 * @rdev: regulator 3377 */ 3378int rdev_get_id(struct regulator_dev *rdev) 3379{ 3380 return rdev->desc->id; 3381} 3382EXPORT_SYMBOL_GPL(rdev_get_id); 3383 3384struct device *rdev_get_dev(struct regulator_dev *rdev) 3385{ 3386 return &rdev->dev; 3387} 3388EXPORT_SYMBOL_GPL(rdev_get_dev); 3389 3390void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3391{ 3392 return reg_init_data->driver_data; 3393} 3394EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3395 3396#ifdef CONFIG_DEBUG_FS 3397static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3398 size_t count, loff_t *ppos) 3399{ 3400 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3401 ssize_t len, ret = 0; 3402 struct regulator_map *map; 3403 3404 if (!buf) 3405 return -ENOMEM; 3406 3407 list_for_each_entry(map, ®ulator_map_list, list) { 3408 len = snprintf(buf + ret, PAGE_SIZE - ret, 3409 "%s -> %s.%s\n", 3410 rdev_get_name(map->regulator), map->dev_name, 3411 map->supply); 3412 if (len >= 0) 3413 ret += len; 3414 if (ret > PAGE_SIZE) { 3415 ret = PAGE_SIZE; 3416 break; 3417 } 3418 } 3419 3420 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3421 3422 kfree(buf); 3423 3424 return ret; 3425} 3426#endif 3427 3428static const struct file_operations supply_map_fops = { 3429#ifdef CONFIG_DEBUG_FS 3430 .read = supply_map_read_file, 3431 .llseek = default_llseek, 3432#endif 3433}; 3434 3435static int __init regulator_init(void) 3436{ 3437 int ret; 3438 3439 ret = class_register(®ulator_class); 3440 3441 debugfs_root = debugfs_create_dir("regulator", NULL); 3442 if (!debugfs_root) 3443 pr_warn("regulator: Failed to create debugfs directory\n"); 3444 3445 debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3446 &supply_map_fops); 3447 3448 regulator_dummy_init(); 3449 3450 return ret; 3451} 3452 3453/* init early to allow our consumers to complete system booting */ 3454core_initcall(regulator_init); 3455 3456static int __init regulator_init_complete(void) 3457{ 3458 struct regulator_dev *rdev; 3459 struct regulator_ops *ops; 3460 struct regulation_constraints *c; 3461 int enabled, ret; 3462 3463 mutex_lock(®ulator_list_mutex); 3464 3465 /* If we have a full configuration then disable any regulators 3466 * which are not in use or always_on. This will become the 3467 * default behaviour in the future. 3468 */ 3469 list_for_each_entry(rdev, ®ulator_list, list) { 3470 ops = rdev->desc->ops; 3471 c = rdev->constraints; 3472 3473 if (!ops->disable || (c && c->always_on)) 3474 continue; 3475 3476 mutex_lock(&rdev->mutex); 3477 3478 if (rdev->use_count) 3479 goto unlock; 3480 3481 /* If we can't read the status assume it's on. */ 3482 if (ops->is_enabled) 3483 enabled = ops->is_enabled(rdev); 3484 else 3485 enabled = 1; 3486 3487 if (!enabled) 3488 goto unlock; 3489 3490 if (has_full_constraints) { 3491 /* We log since this may kill the system if it 3492 * goes wrong. */ 3493 rdev_info(rdev, "disabling\n"); 3494 ret = ops->disable(rdev); 3495 if (ret != 0) { 3496 rdev_err(rdev, "couldn't disable: %d\n", ret); 3497 } 3498 } else { 3499 /* The intention is that in future we will 3500 * assume that full constraints are provided 3501 * so warn even if we aren't going to do 3502 * anything here. 3503 */ 3504 rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3505 } 3506 3507unlock: 3508 mutex_unlock(&rdev->mutex); 3509 } 3510 3511 mutex_unlock(®ulator_list_mutex); 3512 3513 return 0; 3514} 3515late_initcall(regulator_init_complete); 3516