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