SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/regulator/core.c

   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/device.h>
  19 #include <linux/slab.h>
  20 #include <linux/err.h>
  21 #include <linux/mutex.h>
  22 #include <linux/suspend.h>
  23 #include <linux/delay.h>
  24 #include <linux/regulator/consumer.h>
  25 #include <linux/regulator/driver.h>
  26 #include <linux/regulator/machine.h>
  27
  28 #include "dummy.h"
  29
  30 #define REGULATOR_VERSION "0.5"
  31
  32 static DEFINE_MUTEX(regulator_list_mutex);
  33 static LIST_HEAD(regulator_list);
  34 static LIST_HEAD(regulator_map_list);
  35 static int has_full_constraints;
  36
  37 /*
  38  * struct regulator_map
  39  *
  40  * Used to provide symbolic supply names to devices.
  41  */
  42 struct regulator_map {
  43         struct list_head list;
  44         const char *dev_name;   /* The dev_name() for the consumer */
  45         const char *supply;
  46         struct regulator_dev *regulator;
  47 };
  48
  49 /*
  50  * struct regulator
  51  *
  52  * One for each consumer device.
  53  */
  54 struct regulator {
  55         struct device *dev;
  56         struct list_head list;
  57         int uA_load;
  58         int min_uV;
  59         int max_uV;
  60         char *supply_name;
  61         struct device_attribute dev_attr;
  62         struct regulator_dev *rdev;
  63 };
  64
  65 static int _regulator_is_enabled(struct regulator_dev *rdev);
  66 static int _regulator_disable(struct regulator_dev *rdev);
  67 static int _regulator_get_voltage(struct regulator_dev *rdev);
  68 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  69 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  70 static void _notifier_call_chain(struct regulator_dev *rdev,
  71                                   unsigned long event, void *data);
  72
  73 static const char *rdev_get_name(struct regulator_dev *rdev)
  74 {
  75         if (rdev->constraints && rdev->constraints->name)
  76                 return rdev->constraints->name;
  77         else if (rdev->desc->name)
  78                 return rdev->desc->name;
  79         else
  80                 return "";
  81 }
  82
  83 /* gets the regulator for a given consumer device */
  84 static struct regulator *get_device_regulator(struct device *dev)
  85 {
  86         struct regulator *regulator = NULL;
  87         struct regulator_dev *rdev;
  88
  89         mutex_lock(&regulator_list_mutex);
  90         list_for_each_entry(rdev, &regulator_list, list) {
  91                 mutex_lock(&rdev->mutex);
  92                 list_for_each_entry(regulator, &rdev->consumer_list, list) {
  93                         if (regulator->dev == dev) {
  94                                 mutex_unlock(&rdev->mutex);
  95                                 mutex_unlock(&regulator_list_mutex);
  96                                 return regulator;
  97                         }
  98                 }
  99                 mutex_unlock(&rdev->mutex);
 100         }
 101         mutex_unlock(&regulator_list_mutex);
 102         return NULL;
 103 }
 104
 105 /* Platform voltage constraint check */
 106 static int regulator_check_voltage(struct regulator_dev *rdev,
 107                                    int *min_uV, int *max_uV)
 108 {
 109         BUG_ON(*min_uV > *max_uV);
 110
 111         if (!rdev->constraints) {
 112                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 113                        rdev_get_name(rdev));
 114                 return -ENODEV;
 115         }
 116         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 117                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 118                        __func__, rdev_get_name(rdev));
 119                 return -EPERM;
 120         }
 121
 122         if (*max_uV > rdev->constraints->max_uV)
 123                 *max_uV = rdev->constraints->max_uV;
 124         if (*min_uV < rdev->constraints->min_uV)
 125                 *min_uV = rdev->constraints->min_uV;
 126
 127         if (*min_uV > *max_uV)
 128                 return -EINVAL;
 129
 130         return 0;
 131 }
 132
 133 /* current constraint check */
 134 static int regulator_check_current_limit(struct regulator_dev *rdev,
 135                                         int *min_uA, int *max_uA)
 136 {
 137         BUG_ON(*min_uA > *max_uA);
 138
 139         if (!rdev->constraints) {
 140                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 141                        rdev_get_name(rdev));
 142                 return -ENODEV;
 143         }
 144         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 145                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 146                        __func__, rdev_get_name(rdev));
 147                 return -EPERM;
 148         }
 149
 150         if (*max_uA > rdev->constraints->max_uA)
 151                 *max_uA = rdev->constraints->max_uA;
 152         if (*min_uA < rdev->constraints->min_uA)
 153                 *min_uA = rdev->constraints->min_uA;
 154
 155         if (*min_uA > *max_uA)
 156                 return -EINVAL;
 157
 158         return 0;
 159 }
 160
 161 /* operating mode constraint check */
 162 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
 163 {
 164         switch (mode) {
 165         case REGULATOR_MODE_FAST:
 166         case REGULATOR_MODE_NORMAL:
 167         case REGULATOR_MODE_IDLE:
 168         case REGULATOR_MODE_STANDBY:
 169                 break;
 170         default:
 171                 return -EINVAL;
 172         }
 173
 174         if (!rdev->constraints) {
 175                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 176                        rdev_get_name(rdev));
 177                 return -ENODEV;
 178         }
 179         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 180                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 181                        __func__, rdev_get_name(rdev));
 182                 return -EPERM;
 183         }
 184         if (!(rdev->constraints->valid_modes_mask & mode)) {
 185                 printk(KERN_ERR "%s: invalid mode %x for %s\n",
 186                        __func__, mode, rdev_get_name(rdev));
 187                 return -EINVAL;
 188         }
 189         return 0;
 190 }
 191
 192 /* dynamic regulator mode switching constraint check */
 193 static int regulator_check_drms(struct regulator_dev *rdev)
 194 {
 195         if (!rdev->constraints) {
 196                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 197                        rdev_get_name(rdev));
 198                 return -ENODEV;
 199         }
 200         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 201                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 202                        __func__, rdev_get_name(rdev));
 203                 return -EPERM;
 204         }
 205         return 0;
 206 }
 207
 208 static ssize_t device_requested_uA_show(struct device *dev,
 209                              struct device_attribute *attr, char *buf)
 210 {
 211         struct regulator *regulator;
 212
 213         regulator = get_device_regulator(dev);
 214         if (regulator == NULL)
 215                 return 0;
 216
 217         return sprintf(buf, "%d\n", regulator->uA_load);
 218 }
 219
 220 static ssize_t regulator_uV_show(struct device *dev,
 221                                 struct device_attribute *attr, char *buf)
 222 {
 223         struct regulator_dev *rdev = dev_get_drvdata(dev);
 224         ssize_t ret;
 225
 226         mutex_lock(&rdev->mutex);
 227         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 228         mutex_unlock(&rdev->mutex);
 229
 230         return ret;
 231 }
 232 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 233
 234 static ssize_t regulator_uA_show(struct device *dev,
 235                                 struct device_attribute *attr, char *buf)
 236 {
 237         struct regulator_dev *rdev = dev_get_drvdata(dev);
 238
 239         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 240 }
 241 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 242
 243 static ssize_t regulator_name_show(struct device *dev,
 244                              struct device_attribute *attr, char *buf)
 245 {
 246         struct regulator_dev *rdev = dev_get_drvdata(dev);
 247
 248         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 249 }
 250
 251 static ssize_t regulator_print_opmode(char *buf, int mode)
 252 {
 253         switch (mode) {
 254         case REGULATOR_MODE_FAST:
 255                 return sprintf(buf, "fast\n");
 256         case REGULATOR_MODE_NORMAL:
 257                 return sprintf(buf, "normal\n");
 258         case REGULATOR_MODE_IDLE:
 259                 return sprintf(buf, "idle\n");
 260         case REGULATOR_MODE_STANDBY:
 261                 return sprintf(buf, "standby\n");
 262         }
 263         return sprintf(buf, "unknown\n");
 264 }
 265
 266 static ssize_t regulator_opmode_show(struct device *dev,
 267                                     struct device_attribute *attr, char *buf)
 268 {
 269         struct regulator_dev *rdev = dev_get_drvdata(dev);
 270
 271         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 272 }
 273 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 274
 275 static ssize_t regulator_print_state(char *buf, int state)
 276 {
 277         if (state > 0)
 278                 return sprintf(buf, "enabled\n");
 279         else if (state == 0)
 280                 return sprintf(buf, "disabled\n");
 281         else
 282                 return sprintf(buf, "unknown\n");
 283 }
 284
 285 static ssize_t regulator_state_show(struct device *dev,
 286                                    struct device_attribute *attr, char *buf)
 287 {
 288         struct regulator_dev *rdev = dev_get_drvdata(dev);
 289         ssize_t ret;
 290
 291         mutex_lock(&rdev->mutex);
 292         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 293         mutex_unlock(&rdev->mutex);
 294
 295         return ret;
 296 }
 297 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 298
 299 static ssize_t regulator_status_show(struct device *dev,
 300                                    struct device_attribute *attr, char *buf)
 301 {
 302         struct regulator_dev *rdev = dev_get_drvdata(dev);
 303         int status;
 304         char *label;
 305
 306         status = rdev->desc->ops->get_status(rdev);
 307         if (status < 0)
 308                 return status;
 309
 310         switch (status) {
 311         case REGULATOR_STATUS_OFF:
 312                 label = "off";
 313                 break;
 314         case REGULATOR_STATUS_ON:
 315                 label = "on";
 316                 break;
 317         case REGULATOR_STATUS_ERROR:
 318                 label = "error";
 319                 break;
 320         case REGULATOR_STATUS_FAST:
 321                 label = "fast";
 322                 break;
 323         case REGULATOR_STATUS_NORMAL:
 324                 label = "normal";
 325                 break;
 326         case REGULATOR_STATUS_IDLE:
 327                 label = "idle";
 328                 break;
 329         case REGULATOR_STATUS_STANDBY:
 330                 label = "standby";
 331                 break;
 332         default:
 333                 return -ERANGE;
 334         }
 335
 336         return sprintf(buf, "%s\n", label);
 337 }
 338 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 339
 340 static ssize_t regulator_min_uA_show(struct device *dev,
 341                                     struct device_attribute *attr, char *buf)
 342 {
 343         struct regulator_dev *rdev = dev_get_drvdata(dev);
 344
 345         if (!rdev->constraints)
 346                 return sprintf(buf, "constraint not defined\n");
 347
 348         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 349 }
 350 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 351
 352 static ssize_t regulator_max_uA_show(struct device *dev,
 353                                     struct device_attribute *attr, char *buf)
 354 {
 355         struct regulator_dev *rdev = dev_get_drvdata(dev);
 356
 357         if (!rdev->constraints)
 358                 return sprintf(buf, "constraint not defined\n");
 359
 360         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 361 }
 362 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 363
 364 static ssize_t regulator_min_uV_show(struct device *dev,
 365                                     struct device_attribute *attr, char *buf)
 366 {
 367         struct regulator_dev *rdev = dev_get_drvdata(dev);
 368
 369         if (!rdev->constraints)
 370                 return sprintf(buf, "constraint not defined\n");
 371
 372         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 373 }
 374 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 375
 376 static ssize_t regulator_max_uV_show(struct device *dev,
 377                                     struct device_attribute *attr, char *buf)
 378 {
 379         struct regulator_dev *rdev = dev_get_drvdata(dev);
 380
 381         if (!rdev->constraints)
 382                 return sprintf(buf, "constraint not defined\n");
 383
 384         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 385 }
 386 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 387
 388 static ssize_t regulator_total_uA_show(struct device *dev,
 389                                       struct device_attribute *attr, char *buf)
 390 {
 391         struct regulator_dev *rdev = dev_get_drvdata(dev);
 392         struct regulator *regulator;
 393         int uA = 0;
 394
 395         mutex_lock(&rdev->mutex);
 396         list_for_each_entry(regulator, &rdev->consumer_list, list)
 397                 uA += regulator->uA_load;
 398         mutex_unlock(&rdev->mutex);
 399         return sprintf(buf, "%d\n", uA);
 400 }
 401 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 402
 403 static ssize_t regulator_num_users_show(struct device *dev,
 404                                       struct device_attribute *attr, char *buf)
 405 {
 406         struct regulator_dev *rdev = dev_get_drvdata(dev);
 407         return sprintf(buf, "%d\n", rdev->use_count);
 408 }
 409
 410 static ssize_t regulator_type_show(struct device *dev,
 411                                   struct device_attribute *attr, char *buf)
 412 {
 413         struct regulator_dev *rdev = dev_get_drvdata(dev);
 414
 415         switch (rdev->desc->type) {
 416         case REGULATOR_VOLTAGE:
 417                 return sprintf(buf, "voltage\n");
 418         case REGULATOR_CURRENT:
 419                 return sprintf(buf, "current\n");
 420         }
 421         return sprintf(buf, "unknown\n");
 422 }
 423
 424 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 425                                 struct device_attribute *attr, char *buf)
 426 {
 427         struct regulator_dev *rdev = dev_get_drvdata(dev);
 428
 429         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 430 }
 431 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 432                 regulator_suspend_mem_uV_show, NULL);
 433
 434 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 435                                 struct device_attribute *attr, char *buf)
 436 {
 437         struct regulator_dev *rdev = dev_get_drvdata(dev);
 438
 439         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 440 }
 441 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 442                 regulator_suspend_disk_uV_show, NULL);
 443
 444 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 445                                 struct device_attribute *attr, char *buf)
 446 {
 447         struct regulator_dev *rdev = dev_get_drvdata(dev);
 448
 449         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 450 }
 451 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 452                 regulator_suspend_standby_uV_show, NULL);
 453
 454 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 455                                 struct device_attribute *attr, char *buf)
 456 {
 457         struct regulator_dev *rdev = dev_get_drvdata(dev);
 458
 459         return regulator_print_opmode(buf,
 460                 rdev->constraints->state_mem.mode);
 461 }
 462 static DEVICE_ATTR(suspend_mem_mode, 0444,
 463                 regulator_suspend_mem_mode_show, NULL);
 464
 465 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 466                                 struct device_attribute *attr, char *buf)
 467 {
 468         struct regulator_dev *rdev = dev_get_drvdata(dev);
 469
 470         return regulator_print_opmode(buf,
 471                 rdev->constraints->state_disk.mode);
 472 }
 473 static DEVICE_ATTR(suspend_disk_mode, 0444,
 474                 regulator_suspend_disk_mode_show, NULL);
 475
 476 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 477                                 struct device_attribute *attr, char *buf)
 478 {
 479         struct regulator_dev *rdev = dev_get_drvdata(dev);
 480
 481         return regulator_print_opmode(buf,
 482                 rdev->constraints->state_standby.mode);
 483 }
 484 static DEVICE_ATTR(suspend_standby_mode, 0444,
 485                 regulator_suspend_standby_mode_show, NULL);
 486
 487 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 488                                    struct device_attribute *attr, char *buf)
 489 {
 490         struct regulator_dev *rdev = dev_get_drvdata(dev);
 491
 492         return regulator_print_state(buf,
 493                         rdev->constraints->state_mem.enabled);
 494 }
 495 static DEVICE_ATTR(suspend_mem_state, 0444,
 496                 regulator_suspend_mem_state_show, NULL);
 497
 498 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 499                                    struct device_attribute *attr, char *buf)
 500 {
 501         struct regulator_dev *rdev = dev_get_drvdata(dev);
 502
 503         return regulator_print_state(buf,
 504                         rdev->constraints->state_disk.enabled);
 505 }
 506 static DEVICE_ATTR(suspend_disk_state, 0444,
 507                 regulator_suspend_disk_state_show, NULL);
 508
 509 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 510                                    struct device_attribute *attr, char *buf)
 511 {
 512         struct regulator_dev *rdev = dev_get_drvdata(dev);
 513
 514         return regulator_print_state(buf,
 515                         rdev->constraints->state_standby.enabled);
 516 }
 517 static DEVICE_ATTR(suspend_standby_state, 0444,
 518                 regulator_suspend_standby_state_show, NULL);
 519
 520
 521 /*
 522  * These are the only attributes are present for all regulators.
 523  * Other attributes are a function of regulator functionality.
 524  */
 525 static struct device_attribute regulator_dev_attrs[] = {
 526         __ATTR(name, 0444, regulator_name_show, NULL),
 527         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 528         __ATTR(type, 0444, regulator_type_show, NULL),
 529         __ATTR_NULL,
 530 };
 531
 532 static void regulator_dev_release(struct device *dev)
 533 {
 534         struct regulator_dev *rdev = dev_get_drvdata(dev);
 535         kfree(rdev);
 536 }
 537
 538 static struct class regulator_class = {
 539         .name = "regulator",
 540         .dev_release = regulator_dev_release,
 541         .dev_attrs = regulator_dev_attrs,
 542 };
 543
 544 /* Calculate the new optimum regulator operating mode based on the new total
 545  * consumer load. All locks held by caller */
 546 static void drms_uA_update(struct regulator_dev *rdev)
 547 {
 548         struct regulator *sibling;
 549         int current_uA = 0, output_uV, input_uV, err;
 550         unsigned int mode;
 551
 552         err = regulator_check_drms(rdev);
 553         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 554             !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
 555                 return;
 556
 557         /* get output voltage */
 558         output_uV = rdev->desc->ops->get_voltage(rdev);
 559         if (output_uV <= 0)
 560                 return;
 561
 562         /* get input voltage */
 563         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
 564                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
 565         else
 566                 input_uV = rdev->constraints->input_uV;
 567         if (input_uV <= 0)
 568                 return;
 569
 570         /* calc total requested load */
 571         list_for_each_entry(sibling, &rdev->consumer_list, list)
 572                 current_uA += sibling->uA_load;
 573
 574         /* now get the optimum mode for our new total regulator load */
 575         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 576                                                   output_uV, current_uA);
 577
 578         /* check the new mode is allowed */
 579         err = regulator_check_mode(rdev, mode);
 580         if (err == 0)
 581                 rdev->desc->ops->set_mode(rdev, mode);
 582 }
 583
 584 static int suspend_set_state(struct regulator_dev *rdev,
 585         struct regulator_state *rstate)
 586 {
 587         int ret = 0;
 588         bool can_set_state;
 589
 590         can_set_state = rdev->desc->ops->set_suspend_enable &&
 591                 rdev->desc->ops->set_suspend_disable;
 592
 593         /* If we have no suspend mode configration don't set anything;
 594          * only warn if the driver actually makes the suspend mode
 595          * configurable.
 596          */
 597         if (!rstate->enabled && !rstate->disabled) {
 598                 if (can_set_state)
 599                         printk(KERN_WARNING "%s: No configuration for %s\n",
 600                                __func__, rdev_get_name(rdev));
 601                 return 0;
 602         }
 603
 604         if (rstate->enabled && rstate->disabled) {
 605                 printk(KERN_ERR "%s: invalid configuration for %s\n",
 606                        __func__, rdev_get_name(rdev));
 607                 return -EINVAL;
 608         }
 609
 610         if (!can_set_state) {
 611                 printk(KERN_ERR "%s: no way to set suspend state\n",
 612                         __func__);
 613                 return -EINVAL;
 614         }
 615
 616         if (rstate->enabled)
 617                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 618         else
 619                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 620         if (ret < 0) {
 621                 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
 622                 return ret;
 623         }
 624
 625         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 626                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 627                 if (ret < 0) {
 628                         printk(KERN_ERR "%s: failed to set voltage\n",
 629                                 __func__);
 630                         return ret;
 631                 }
 632         }
 633
 634         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 635                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 636                 if (ret < 0) {
 637                         printk(KERN_ERR "%s: failed to set mode\n", __func__);
 638                         return ret;
 639                 }
 640         }
 641         return ret;
 642 }
 643
 644 /* locks held by caller */
 645 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 646 {
 647         if (!rdev->constraints)
 648                 return -EINVAL;
 649
 650         switch (state) {
 651         case PM_SUSPEND_STANDBY:
 652                 return suspend_set_state(rdev,
 653                         &rdev->constraints->state_standby);
 654         case PM_SUSPEND_MEM:
 655                 return suspend_set_state(rdev,
 656                         &rdev->constraints->state_mem);
 657         case PM_SUSPEND_MAX:
 658                 return suspend_set_state(rdev,
 659                         &rdev->constraints->state_disk);
 660         default:
 661                 return -EINVAL;
 662         }
 663 }
 664
 665 static void print_constraints(struct regulator_dev *rdev)
 666 {
 667         struct regulation_constraints *constraints = rdev->constraints;
 668         char buf[80] = "";
 669         int count = 0;
 670         int ret;
 671
 672         if (constraints->min_uV && constraints->max_uV) {
 673                 if (constraints->min_uV == constraints->max_uV)
 674                         count += sprintf(buf + count, "%d mV ",
 675                                          constraints->min_uV / 1000);
 676                 else
 677                         count += sprintf(buf + count, "%d <--> %d mV ",
 678                                          constraints->min_uV / 1000,
 679                                          constraints->max_uV / 1000);
 680         }
 681
 682         if (!constraints->min_uV ||
 683             constraints->min_uV != constraints->max_uV) {
 684                 ret = _regulator_get_voltage(rdev);
 685                 if (ret > 0)
 686                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 687         }
 688
 689         if (constraints->min_uA && constraints->max_uA) {
 690                 if (constraints->min_uA == constraints->max_uA)
 691                         count += sprintf(buf + count, "%d mA ",
 692                                          constraints->min_uA / 1000);
 693                 else
 694                         count += sprintf(buf + count, "%d <--> %d mA ",
 695                                          constraints->min_uA / 1000,
 696                                          constraints->max_uA / 1000);
 697         }
 698
 699         if (!constraints->min_uA ||
 700             constraints->min_uA != constraints->max_uA) {
 701                 ret = _regulator_get_current_limit(rdev);
 702                 if (ret > 0)
 703                         count += sprintf(buf + count, "at %d uA ", ret / 1000);
 704         }
 705
 706         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 707                 count += sprintf(buf + count, "fast ");
 708         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 709                 count += sprintf(buf + count, "normal ");
 710         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 711                 count += sprintf(buf + count, "idle ");
 712         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 713                 count += sprintf(buf + count, "standby");
 714
 715         printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf);
 716 }
 717
 718 static int machine_constraints_voltage(struct regulator_dev *rdev,
 719         struct regulation_constraints *constraints)
 720 {
 721         struct regulator_ops *ops = rdev->desc->ops;
 722         const char *name = rdev_get_name(rdev);
 723         int ret;
 724
 725         /* do we need to apply the constraint voltage */
 726         if (rdev->constraints->apply_uV &&
 727                 rdev->constraints->min_uV == rdev->constraints->max_uV &&
 728                 ops->set_voltage) {
 729                 ret = ops->set_voltage(rdev,
 730                         rdev->constraints->min_uV, rdev->constraints->max_uV);
 731                         if (ret < 0) {
 732                                 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
 733                                        __func__,
 734                                        rdev->constraints->min_uV, name);
 735                                 rdev->constraints = NULL;
 736                                 return ret;
 737                         }
 738         }
 739
 740         /* constrain machine-level voltage specs to fit
 741          * the actual range supported by this regulator.
 742          */
 743         if (ops->list_voltage && rdev->desc->n_voltages) {
 744                 int     count = rdev->desc->n_voltages;
 745                 int     i;
 746                 int     min_uV = INT_MAX;
 747                 int     max_uV = INT_MIN;
 748                 int     cmin = constraints->min_uV;
 749                 int     cmax = constraints->max_uV;
 750
 751                 /* it's safe to autoconfigure fixed-voltage supplies
 752                    and the constraints are used by list_voltage. */
 753                 if (count == 1 && !cmin) {
 754                         cmin = 1;
 755                         cmax = INT_MAX;
 756                         constraints->min_uV = cmin;
 757                         constraints->max_uV = cmax;
 758                 }
 759
 760                 /* voltage constraints are optional */
 761                 if ((cmin == 0) && (cmax == 0))
 762                         return 0;
 763
 764                 /* else require explicit machine-level constraints */
 765                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 766                         pr_err("%s: %s '%s' voltage constraints\n",
 767                                        __func__, "invalid", name);
 768                         return -EINVAL;
 769                 }
 770
 771                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 772                 for (i = 0; i < count; i++) {
 773                         int     value;
 774
 775                         value = ops->list_voltage(rdev, i);
 776                         if (value <= 0)
 777                                 continue;
 778
 779                         /* maybe adjust [min_uV..max_uV] */
 780                         if (value >= cmin && value < min_uV)
 781                                 min_uV = value;
 782                         if (value <= cmax && value > max_uV)
 783                                 max_uV = value;
 784                 }
 785
 786                 /* final: [min_uV..max_uV] valid iff constraints valid */
 787                 if (max_uV < min_uV) {
 788                         pr_err("%s: %s '%s' voltage constraints\n",
 789                                        __func__, "unsupportable", name);
 790                         return -EINVAL;
 791                 }
 792
 793                 /* use regulator's subset of machine constraints */
 794                 if (constraints->min_uV < min_uV) {
 795                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 796                                        __func__, name, "min_uV",
 797                                         constraints->min_uV, min_uV);
 798                         constraints->min_uV = min_uV;
 799                 }
 800                 if (constraints->max_uV > max_uV) {
 801                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 802                                        __func__, name, "max_uV",
 803                                         constraints->max_uV, max_uV);
 804                         constraints->max_uV = max_uV;
 805                 }
 806         }
 807
 808         return 0;
 809 }
 810
 811 /**
 812  * set_machine_constraints - sets regulator constraints
 813  * @rdev: regulator source
 814  * @constraints: constraints to apply
 815  *
 816  * Allows platform initialisation code to define and constrain
 817  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 818  * Constraints *must* be set by platform code in order for some
 819  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 820  * set_mode.
 821  */
 822 static int set_machine_constraints(struct regulator_dev *rdev,
 823         struct regulation_constraints *constraints)
 824 {
 825         int ret = 0;
 826         const char *name;
 827         struct regulator_ops *ops = rdev->desc->ops;
 828
 829         rdev->constraints = constraints;
 830
 831         name = rdev_get_name(rdev);
 832
 833         ret = machine_constraints_voltage(rdev, constraints);
 834         if (ret != 0)
 835                 goto out;
 836
 837         /* do we need to setup our suspend state */
 838         if (constraints->initial_state) {
 839                 ret = suspend_prepare(rdev, constraints->initial_state);
 840                 if (ret < 0) {
 841                         printk(KERN_ERR "%s: failed to set suspend state for %s\n",
 842                                __func__, name);
 843                         rdev->constraints = NULL;
 844                         goto out;
 845                 }
 846         }
 847
 848         if (constraints->initial_mode) {
 849                 if (!ops->set_mode) {
 850                         printk(KERN_ERR "%s: no set_mode operation for %s\n",
 851                                __func__, name);
 852                         ret = -EINVAL;
 853                         goto out;
 854                 }
 855
 856                 ret = ops->set_mode(rdev, constraints->initial_mode);
 857                 if (ret < 0) {
 858                         printk(KERN_ERR
 859                                "%s: failed to set initial mode for %s: %d\n",
 860                                __func__, name, ret);
 861                         goto out;
 862                 }
 863         }
 864
 865         /* If the constraints say the regulator should be on at this point
 866          * and we have control then make sure it is enabled.
 867          */
 868         if ((constraints->always_on || constraints->boot_on) && ops->enable) {
 869                 ret = ops->enable(rdev);
 870                 if (ret < 0) {
 871                         printk(KERN_ERR "%s: failed to enable %s\n",
 872                                __func__, name);
 873                         rdev->constraints = NULL;
 874                         goto out;
 875                 }
 876         }
 877
 878         print_constraints(rdev);
 879 out:
 880         return ret;
 881 }
 882
 883 /**
 884  * set_supply - set regulator supply regulator
 885  * @rdev: regulator name
 886  * @supply_rdev: supply regulator name
 887  *
 888  * Called by platform initialisation code to set the supply regulator for this
 889  * regulator. This ensures that a regulators supply will also be enabled by the
 890  * core if it's child is enabled.
 891  */
 892 static int set_supply(struct regulator_dev *rdev,
 893         struct regulator_dev *supply_rdev)
 894 {
 895         int err;
 896
 897         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 898                                 "supply");
 899         if (err) {
 900                 printk(KERN_ERR
 901                        "%s: could not add device link %s err %d\n",
 902                        __func__, supply_rdev->dev.kobj.name, err);
 903                        goto out;
 904         }
 905         rdev->supply = supply_rdev;
 906         list_add(&rdev->slist, &supply_rdev->supply_list);
 907 out:
 908         return err;
 909 }
 910
 911 /**
 912  * set_consumer_device_supply: Bind a regulator to a symbolic supply
 913  * @rdev:         regulator source
 914  * @consumer_dev: device the supply applies to
 915  * @consumer_dev_name: dev_name() string for device supply applies to
 916  * @supply:       symbolic name for supply
 917  *
 918  * Allows platform initialisation code to map physical regulator
 919  * sources to symbolic names for supplies for use by devices.  Devices
 920  * should use these symbolic names to request regulators, avoiding the
 921  * need to provide board-specific regulator names as platform data.
 922  *
 923  * Only one of consumer_dev and consumer_dev_name may be specified.
 924  */
 925 static int set_consumer_device_supply(struct regulator_dev *rdev,
 926         struct device *consumer_dev, const char *consumer_dev_name,
 927         const char *supply)
 928 {
 929         struct regulator_map *node;
 930         int has_dev;
 931
 932         if (consumer_dev && consumer_dev_name)
 933                 return -EINVAL;
 934
 935         if (!consumer_dev_name && consumer_dev)
 936                 consumer_dev_name = dev_name(consumer_dev);
 937
 938         if (supply == NULL)
 939                 return -EINVAL;
 940
 941         if (consumer_dev_name != NULL)
 942                 has_dev = 1;
 943         else
 944                 has_dev = 0;
 945
 946         list_for_each_entry(node, &regulator_map_list, list) {
 947                 if (consumer_dev_name != node->dev_name)
 948                         continue;
 949                 if (strcmp(node->supply, supply) != 0)
 950                         continue;
 951
 952                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 953                                 dev_name(&node->regulator->dev),
 954                                 node->regulator->desc->name,
 955                                 supply,
 956                                 dev_name(&rdev->dev), rdev_get_name(rdev));
 957                 return -EBUSY;
 958         }
 959
 960         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
 961         if (node == NULL)
 962                 return -ENOMEM;
 963
 964         node->regulator = rdev;
 965         node->supply = supply;
 966
 967         if (has_dev) {
 968                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
 969                 if (node->dev_name == NULL) {
 970                         kfree(node);
 971                         return -ENOMEM;
 972                 }
 973         }
 974
 975         list_add(&node->list, &regulator_map_list);
 976         return 0;
 977 }
 978
 979 static void unset_consumer_device_supply(struct regulator_dev *rdev,
 980         const char *consumer_dev_name, struct device *consumer_dev)
 981 {
 982         struct regulator_map *node, *n;
 983
 984         if (consumer_dev && !consumer_dev_name)
 985                 consumer_dev_name = dev_name(consumer_dev);
 986
 987         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 988                 if (rdev != node->regulator)
 989                         continue;
 990
 991                 if (consumer_dev_name && node->dev_name &&
 992                     strcmp(consumer_dev_name, node->dev_name))
 993                         continue;
 994
 995                 list_del(&node->list);
 996                 kfree(node->dev_name);
 997                 kfree(node);
 998                 return;
 999         }
1000 }
1001
1002 static void unset_regulator_supplies(struct regulator_dev *rdev)
1003 {
1004         struct regulator_map *node, *n;
1005
1006         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1007                 if (rdev == node->regulator) {
1008                         list_del(&node->list);
1009                         kfree(node->dev_name);
1010                         kfree(node);
1011                         return;
1012                 }
1013         }
1014 }
1015
1016 #define REG_STR_SIZE    32
1017
1018 static struct regulator *create_regulator(struct regulator_dev *rdev,
1019                                           struct device *dev,
1020                                           const char *supply_name)
1021 {
1022         struct regulator *regulator;
1023         char buf[REG_STR_SIZE];
1024         int err, size;
1025
1026         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1027         if (regulator == NULL)
1028                 return NULL;
1029
1030         mutex_lock(&rdev->mutex);
1031         regulator->rdev = rdev;
1032         list_add(&regulator->list, &rdev->consumer_list);
1033
1034         if (dev) {
1035                 /* create a 'requested_microamps_name' sysfs entry */
1036                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
1037                         supply_name);
1038                 if (size >= REG_STR_SIZE)
1039                         goto overflow_err;
1040
1041                 regulator->dev = dev;
1042                 sysfs_attr_init(&regulator->dev_attr.attr);
1043                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1044                 if (regulator->dev_attr.attr.name == NULL)
1045                         goto attr_name_err;
1046
1047                 regulator->dev_attr.attr.owner = THIS_MODULE;
1048                 regulator->dev_attr.attr.mode = 0444;
1049                 regulator->dev_attr.show = device_requested_uA_show;
1050                 err = device_create_file(dev, &regulator->dev_attr);
1051                 if (err < 0) {
1052                         printk(KERN_WARNING "%s: could not add regulator_dev"
1053                                 " load sysfs\n", __func__);
1054                         goto attr_name_err;
1055                 }
1056
1057                 /* also add a link to the device sysfs entry */
1058                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1059                                  dev->kobj.name, supply_name);
1060                 if (size >= REG_STR_SIZE)
1061                         goto attr_err;
1062
1063                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1064                 if (regulator->supply_name == NULL)
1065                         goto attr_err;
1066
1067                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1068                                         buf);
1069                 if (err) {
1070                         printk(KERN_WARNING
1071                                "%s: could not add device link %s err %d\n",
1072                                __func__, dev->kobj.name, err);
1073                         device_remove_file(dev, &regulator->dev_attr);
1074                         goto link_name_err;
1075                 }
1076         }
1077         mutex_unlock(&rdev->mutex);
1078         return regulator;
1079 link_name_err:
1080         kfree(regulator->supply_name);
1081 attr_err:
1082         device_remove_file(regulator->dev, &regulator->dev_attr);
1083 attr_name_err:
1084         kfree(regulator->dev_attr.attr.name);
1085 overflow_err:
1086         list_del(&regulator->list);
1087         kfree(regulator);
1088         mutex_unlock(&rdev->mutex);
1089         return NULL;
1090 }
1091
1092 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1093 {
1094         if (!rdev->desc->ops->enable_time)
1095                 return 0;
1096         return rdev->desc->ops->enable_time(rdev);
1097 }
1098
1099 /* Internal regulator request function */
1100 static struct regulator *_regulator_get(struct device *dev, const char *id,
1101                                         int exclusive)
1102 {
1103         struct regulator_dev *rdev;
1104         struct regulator_map *map;
1105         struct regulator *regulator = ERR_PTR(-ENODEV);
1106         const char *devname = NULL;
1107         int ret;
1108
1109         if (id == NULL) {
1110                 printk(KERN_ERR "regulator: get() with no identifier\n");
1111                 return regulator;
1112         }
1113
1114         if (dev)
1115                 devname = dev_name(dev);
1116
1117         mutex_lock(&regulator_list_mutex);
1118
1119         list_for_each_entry(map, &regulator_map_list, list) {
1120                 /* If the mapping has a device set up it must match */
1121                 if (map->dev_name &&
1122                     (!devname || strcmp(map->dev_name, devname)))
1123                         continue;
1124
1125                 if (strcmp(map->supply, id) == 0) {
1126                         rdev = map->regulator;
1127                         goto found;
1128                 }
1129         }
1130
1131 #ifdef CONFIG_REGULATOR_DUMMY
1132         if (!devname)
1133                 devname = "deviceless";
1134
1135         /* If the board didn't flag that it was fully constrained then
1136          * substitute in a dummy regulator so consumers can continue.
1137          */
1138         if (!has_full_constraints) {
1139                 pr_warning("%s supply %s not found, using dummy regulator\n",
1140                            devname, id);
1141                 rdev = dummy_regulator_rdev;
1142                 goto found;
1143         }
1144 #endif
1145
1146         mutex_unlock(&regulator_list_mutex);
1147         return regulator;
1148
1149 found:
1150         if (rdev->exclusive) {
1151                 regulator = ERR_PTR(-EPERM);
1152                 goto out;
1153         }
1154
1155         if (exclusive && rdev->open_count) {
1156                 regulator = ERR_PTR(-EBUSY);
1157                 goto out;
1158         }
1159
1160         if (!try_module_get(rdev->owner))
1161                 goto out;
1162
1163         regulator = create_regulator(rdev, dev, id);
1164         if (regulator == NULL) {
1165                 regulator = ERR_PTR(-ENOMEM);
1166                 module_put(rdev->owner);
1167         }
1168
1169         rdev->open_count++;
1170         if (exclusive) {
1171                 rdev->exclusive = 1;
1172
1173                 ret = _regulator_is_enabled(rdev);
1174                 if (ret > 0)
1175                         rdev->use_count = 1;
1176                 else
1177                         rdev->use_count = 0;
1178         }
1179
1180 out:
1181         mutex_unlock(&regulator_list_mutex);
1182
1183         return regulator;
1184 }
1185
1186 /**
1187  * regulator_get - lookup and obtain a reference to a regulator.
1188  * @dev: device for regulator "consumer"
1189  * @id: Supply name or regulator ID.
1190  *
1191  * Returns a struct regulator corresponding to the regulator producer,
1192  * or IS_ERR() condition containing errno.
1193  *
1194  * Use of supply names configured via regulator_set_device_supply() is
1195  * strongly encouraged.  It is recommended that the supply name used
1196  * should match the name used for the supply and/or the relevant
1197  * device pins in the datasheet.
1198  */
1199 struct regulator *regulator_get(struct device *dev, const char *id)
1200 {
1201         return _regulator_get(dev, id, 0);
1202 }
1203 EXPORT_SYMBOL_GPL(regulator_get);
1204
1205 /**
1206  * regulator_get_exclusive - obtain exclusive access to a regulator.
1207  * @dev: device for regulator "consumer"
1208  * @id: Supply name or regulator ID.
1209  *
1210  * Returns a struct regulator corresponding to the regulator producer,
1211  * or IS_ERR() condition containing errno.  Other consumers will be
1212  * unable to obtain this reference is held and the use count for the
1213  * regulator will be initialised to reflect the current state of the
1214  * regulator.
1215  *
1216  * This is intended for use by consumers which cannot tolerate shared
1217  * use of the regulator such as those which need to force the
1218  * regulator off for correct operation of the hardware they are
1219  * controlling.
1220  *
1221  * Use of supply names configured via regulator_set_device_supply() is
1222  * strongly encouraged.  It is recommended that the supply name used
1223  * should match the name used for the supply and/or the relevant
1224  * device pins in the datasheet.
1225  */
1226 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1227 {
1228         return _regulator_get(dev, id, 1);
1229 }
1230 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1231
1232 /**
1233  * regulator_put - "free" the regulator source
1234  * @regulator: regulator source
1235  *
1236  * Note: drivers must ensure that all regulator_enable calls made on this
1237  * regulator source are balanced by regulator_disable calls prior to calling
1238  * this function.
1239  */
1240 void regulator_put(struct regulator *regulator)
1241 {
1242         struct regulator_dev *rdev;
1243
1244         if (regulator == NULL || IS_ERR(regulator))
1245                 return;
1246
1247         mutex_lock(&regulator_list_mutex);
1248         rdev = regulator->rdev;
1249
1250         /* remove any sysfs entries */
1251         if (regulator->dev) {
1252                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1253                 kfree(regulator->supply_name);
1254                 device_remove_file(regulator->dev, &regulator->dev_attr);
1255                 kfree(regulator->dev_attr.attr.name);
1256         }
1257         list_del(&regulator->list);
1258         kfree(regulator);
1259
1260         rdev->open_count--;
1261         rdev->exclusive = 0;
1262
1263         module_put(rdev->owner);
1264         mutex_unlock(&regulator_list_mutex);
1265 }
1266 EXPORT_SYMBOL_GPL(regulator_put);
1267
1268 static int _regulator_can_change_status(struct regulator_dev *rdev)
1269 {
1270         if (!rdev->constraints)
1271                 return 0;
1272
1273         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1274                 return 1;
1275         else
1276                 return 0;
1277 }
1278
1279 /* locks held by regulator_enable() */
1280 static int _regulator_enable(struct regulator_dev *rdev)
1281 {
1282         int ret, delay;
1283
1284         /* do we need to enable the supply regulator first */
1285         if (rdev->supply) {
1286                 ret = _regulator_enable(rdev->supply);
1287                 if (ret < 0) {
1288                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1289                                __func__, rdev_get_name(rdev), ret);
1290                         return ret;
1291                 }
1292         }
1293
1294         /* check voltage and requested load before enabling */
1295         if (rdev->constraints &&
1296             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1297                 drms_uA_update(rdev);
1298
1299         if (rdev->use_count == 0) {
1300                 /* The regulator may on if it's not switchable or left on */
1301                 ret = _regulator_is_enabled(rdev);
1302                 if (ret == -EINVAL || ret == 0) {
1303                         if (!_regulator_can_change_status(rdev))
1304                                 return -EPERM;
1305
1306                         if (!rdev->desc->ops->enable)
1307                                 return -EINVAL;
1308
1309                         /* Query before enabling in case configuration
1310                          * dependant.  */
1311                         ret = _regulator_get_enable_time(rdev);
1312                         if (ret >= 0) {
1313                                 delay = ret;
1314                         } else {
1315                                 printk(KERN_WARNING
1316                                         "%s: enable_time() failed for %s: %d\n",
1317                                         __func__, rdev_get_name(rdev),
1318                                         ret);
1319                                 delay = 0;
1320                         }
1321
1322                         /* Allow the regulator to ramp; it would be useful
1323                          * to extend this for bulk operations so that the
1324                          * regulators can ramp together.  */
1325                         ret = rdev->desc->ops->enable(rdev);
1326                         if (ret < 0)
1327                                 return ret;
1328
1329                         if (delay >= 1000)
1330                                 mdelay(delay / 1000);
1331                         else if (delay)
1332                                 udelay(delay);
1333
1334                 } else if (ret < 0) {
1335                         printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n",
1336                                __func__, rdev_get_name(rdev), ret);
1337                         return ret;
1338                 }
1339                 /* Fallthrough on positive return values - already enabled */
1340         }
1341
1342         rdev->use_count++;
1343
1344         return 0;
1345 }
1346
1347 /**
1348  * regulator_enable - enable regulator output
1349  * @regulator: regulator source
1350  *
1351  * Request that the regulator be enabled with the regulator output at
1352  * the predefined voltage or current value.  Calls to regulator_enable()
1353  * must be balanced with calls to regulator_disable().
1354  *
1355  * NOTE: the output value can be set by other drivers, boot loader or may be
1356  * hardwired in the regulator.
1357  */
1358 int regulator_enable(struct regulator *regulator)
1359 {
1360         struct regulator_dev *rdev = regulator->rdev;
1361         int ret = 0;
1362
1363         mutex_lock(&rdev->mutex);
1364         ret = _regulator_enable(rdev);
1365         mutex_unlock(&rdev->mutex);
1366         return ret;
1367 }
1368 EXPORT_SYMBOL_GPL(regulator_enable);
1369
1370 /* locks held by regulator_disable() */
1371 static int _regulator_disable(struct regulator_dev *rdev)
1372 {
1373         int ret = 0;
1374
1375         if (WARN(rdev->use_count <= 0,
1376                         "unbalanced disables for %s\n",
1377                         rdev_get_name(rdev)))
1378                 return -EIO;
1379
1380         /* are we the last user and permitted to disable ? */
1381         if (rdev->use_count == 1 &&
1382             (rdev->constraints && !rdev->constraints->always_on)) {
1383
1384                 /* we are last user */
1385                 if (_regulator_can_change_status(rdev) &&
1386                     rdev->desc->ops->disable) {
1387                         ret = rdev->desc->ops->disable(rdev);
1388                         if (ret < 0) {
1389                                 printk(KERN_ERR "%s: failed to disable %s\n",
1390                                        __func__, rdev_get_name(rdev));
1391                                 return ret;
1392                         }
1393
1394                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1395                                              NULL);
1396                 }
1397
1398                 /* decrease our supplies ref count and disable if required */
1399                 if (rdev->supply)
1400                         _regulator_disable(rdev->supply);
1401
1402                 rdev->use_count = 0;
1403         } else if (rdev->use_count > 1) {
1404
1405                 if (rdev->constraints &&
1406                         (rdev->constraints->valid_ops_mask &
1407                         REGULATOR_CHANGE_DRMS))
1408                         drms_uA_update(rdev);
1409
1410                 rdev->use_count--;
1411         }
1412         return ret;
1413 }
1414
1415 /**
1416  * regulator_disable - disable regulator output
1417  * @regulator: regulator source
1418  *
1419  * Disable the regulator output voltage or current.  Calls to
1420  * regulator_enable() must be balanced with calls to
1421  * regulator_disable().
1422  *
1423  * NOTE: this will only disable the regulator output if no other consumer
1424  * devices have it enabled, the regulator device supports disabling and
1425  * machine constraints permit this operation.
1426  */
1427 int regulator_disable(struct regulator *regulator)
1428 {
1429         struct regulator_dev *rdev = regulator->rdev;
1430         int ret = 0;
1431
1432         mutex_lock(&rdev->mutex);
1433         ret = _regulator_disable(rdev);
1434         mutex_unlock(&rdev->mutex);
1435         return ret;
1436 }
1437 EXPORT_SYMBOL_GPL(regulator_disable);
1438
1439 /* locks held by regulator_force_disable() */
1440 static int _regulator_force_disable(struct regulator_dev *rdev)
1441 {
1442         int ret = 0;
1443
1444         /* force disable */
1445         if (rdev->desc->ops->disable) {
1446                 /* ah well, who wants to live forever... */
1447                 ret = rdev->desc->ops->disable(rdev);
1448                 if (ret < 0) {
1449                         printk(KERN_ERR "%s: failed to force disable %s\n",
1450                                __func__, rdev_get_name(rdev));
1451                         return ret;
1452                 }
1453                 /* notify other consumers that power has been forced off */
1454                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1455                         REGULATOR_EVENT_DISABLE, NULL);
1456         }
1457
1458         /* decrease our supplies ref count and disable if required */
1459         if (rdev->supply)
1460                 _regulator_disable(rdev->supply);
1461
1462         rdev->use_count = 0;
1463         return ret;
1464 }
1465
1466 /**
1467  * regulator_force_disable - force disable regulator output
1468  * @regulator: regulator source
1469  *
1470  * Forcibly disable the regulator output voltage or current.
1471  * NOTE: this *will* disable the regulator output even if other consumer
1472  * devices have it enabled. This should be used for situations when device
1473  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1474  */
1475 int regulator_force_disable(struct regulator *regulator)
1476 {
1477         int ret;
1478
1479         mutex_lock(&regulator->rdev->mutex);
1480         regulator->uA_load = 0;
1481         ret = _regulator_force_disable(regulator->rdev);
1482         mutex_unlock(&regulator->rdev->mutex);
1483         return ret;
1484 }
1485 EXPORT_SYMBOL_GPL(regulator_force_disable);
1486
1487 static int _regulator_is_enabled(struct regulator_dev *rdev)
1488 {
1489         /* If we don't know then assume that the regulator is always on */
1490         if (!rdev->desc->ops->is_enabled)
1491                 return 1;
1492
1493         return rdev->desc->ops->is_enabled(rdev);
1494 }
1495
1496 /**
1497  * regulator_is_enabled - is the regulator output enabled
1498  * @regulator: regulator source
1499  *
1500  * Returns positive if the regulator driver backing the source/client
1501  * has requested that the device be enabled, zero if it hasn't, else a
1502  * negative errno code.
1503  *
1504  * Note that the device backing this regulator handle can have multiple
1505  * users, so it might be enabled even if regulator_enable() was never
1506  * called for this particular source.
1507  */
1508 int regulator_is_enabled(struct regulator *regulator)
1509 {
1510         int ret;
1511
1512         mutex_lock(&regulator->rdev->mutex);
1513         ret = _regulator_is_enabled(regulator->rdev);
1514         mutex_unlock(&regulator->rdev->mutex);
1515
1516         return ret;
1517 }
1518 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1519
1520 /**
1521  * regulator_count_voltages - count regulator_list_voltage() selectors
1522  * @regulator: regulator source
1523  *
1524  * Returns number of selectors, or negative errno.  Selectors are
1525  * numbered starting at zero, and typically correspond to bitfields
1526  * in hardware registers.
1527  */
1528 int regulator_count_voltages(struct regulator *regulator)
1529 {
1530         struct regulator_dev    *rdev = regulator->rdev;
1531
1532         return rdev->desc->n_voltages ? : -EINVAL;
1533 }
1534 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1535
1536 /**
1537  * regulator_list_voltage - enumerate supported voltages
1538  * @regulator: regulator source
1539  * @selector: identify voltage to list
1540  * Context: can sleep
1541  *
1542  * Returns a voltage that can be passed to @regulator_set_voltage(),
1543  * zero if this selector code can't be used on this system, or a
1544  * negative errno.
1545  */
1546 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1547 {
1548         struct regulator_dev    *rdev = regulator->rdev;
1549         struct regulator_ops    *ops = rdev->desc->ops;
1550         int                     ret;
1551
1552         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1553                 return -EINVAL;
1554
1555         mutex_lock(&rdev->mutex);
1556         ret = ops->list_voltage(rdev, selector);
1557         mutex_unlock(&rdev->mutex);
1558
1559         if (ret > 0) {
1560                 if (ret < rdev->constraints->min_uV)
1561                         ret = 0;
1562                 else if (ret > rdev->constraints->max_uV)
1563                         ret = 0;
1564         }
1565
1566         return ret;
1567 }
1568 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1569
1570 /**
1571  * regulator_is_supported_voltage - check if a voltage range can be supported
1572  *
1573  * @regulator: Regulator to check.
1574  * @min_uV: Minimum required voltage in uV.
1575  * @max_uV: Maximum required voltage in uV.
1576  *
1577  * Returns a boolean or a negative error code.
1578  */
1579 int regulator_is_supported_voltage(struct regulator *regulator,
1580                                    int min_uV, int max_uV)
1581 {
1582         int i, voltages, ret;
1583
1584         ret = regulator_count_voltages(regulator);
1585         if (ret < 0)
1586                 return ret;
1587         voltages = ret;
1588
1589         for (i = 0; i < voltages; i++) {
1590                 ret = regulator_list_voltage(regulator, i);
1591
1592                 if (ret >= min_uV && ret <= max_uV)
1593                         return 1;
1594         }
1595
1596         return 0;
1597 }
1598
1599 /**
1600  * regulator_set_voltage - set regulator output voltage
1601  * @regulator: regulator source
1602  * @min_uV: Minimum required voltage in uV
1603  * @max_uV: Maximum acceptable voltage in uV
1604  *
1605  * Sets a voltage regulator to the desired output voltage. This can be set
1606  * during any regulator state. IOW, regulator can be disabled or enabled.
1607  *
1608  * If the regulator is enabled then the voltage will change to the new value
1609  * immediately otherwise if the regulator is disabled the regulator will
1610  * output at the new voltage when enabled.
1611  *
1612  * NOTE: If the regulator is shared between several devices then the lowest
1613  * request voltage that meets the system constraints will be used.
1614  * Regulator system constraints must be set for this regulator before
1615  * calling this function otherwise this call will fail.
1616  */
1617 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1618 {
1619         struct regulator_dev *rdev = regulator->rdev;
1620         int ret;
1621
1622         mutex_lock(&rdev->mutex);
1623
1624         /* sanity check */
1625         if (!rdev->desc->ops->set_voltage) {
1626                 ret = -EINVAL;
1627                 goto out;
1628         }
1629
1630         /* constraints check */
1631         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1632         if (ret < 0)
1633                 goto out;
1634         regulator->min_uV = min_uV;
1635         regulator->max_uV = max_uV;
1636         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1637
1638 out:
1639         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1640         mutex_unlock(&rdev->mutex);
1641         return ret;
1642 }
1643 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1644
1645 static int _regulator_get_voltage(struct regulator_dev *rdev)
1646 {
1647         /* sanity check */
1648         if (rdev->desc->ops->get_voltage)
1649                 return rdev->desc->ops->get_voltage(rdev);
1650         else
1651                 return -EINVAL;
1652 }
1653
1654 /**
1655  * regulator_get_voltage - get regulator output voltage
1656  * @regulator: regulator source
1657  *
1658  * This returns the current regulator voltage in uV.
1659  *
1660  * NOTE: If the regulator is disabled it will return the voltage value. This
1661  * function should not be used to determine regulator state.
1662  */
1663 int regulator_get_voltage(struct regulator *regulator)
1664 {
1665         int ret;
1666
1667         mutex_lock(&regulator->rdev->mutex);
1668
1669         ret = _regulator_get_voltage(regulator->rdev);
1670
1671         mutex_unlock(&regulator->rdev->mutex);
1672
1673         return ret;
1674 }
1675 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1676
1677 /**
1678  * regulator_set_current_limit - set regulator output current limit
1679  * @regulator: regulator source
1680  * @min_uA: Minimuum supported current in uA
1681  * @max_uA: Maximum supported current in uA
1682  *
1683  * Sets current sink to the desired output current. This can be set during
1684  * any regulator state. IOW, regulator can be disabled or enabled.
1685  *
1686  * If the regulator is enabled then the current will change to the new value
1687  * immediately otherwise if the regulator is disabled the regulator will
1688  * output at the new current when enabled.
1689  *
1690  * NOTE: Regulator system constraints must be set for this regulator before
1691  * calling this function otherwise this call will fail.
1692  */
1693 int regulator_set_current_limit(struct regulator *regulator,
1694                                int min_uA, int max_uA)
1695 {
1696         struct regulator_dev *rdev = regulator->rdev;
1697         int ret;
1698
1699         mutex_lock(&rdev->mutex);
1700
1701         /* sanity check */
1702         if (!rdev->desc->ops->set_current_limit) {
1703                 ret = -EINVAL;
1704                 goto out;
1705         }
1706
1707         /* constraints check */
1708         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1709         if (ret < 0)
1710                 goto out;
1711
1712         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1713 out:
1714         mutex_unlock(&rdev->mutex);
1715         return ret;
1716 }
1717 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1718
1719 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1720 {
1721         int ret;
1722
1723         mutex_lock(&rdev->mutex);
1724
1725         /* sanity check */
1726         if (!rdev->desc->ops->get_current_limit) {
1727                 ret = -EINVAL;
1728                 goto out;
1729         }
1730
1731         ret = rdev->desc->ops->get_current_limit(rdev);
1732 out:
1733         mutex_unlock(&rdev->mutex);
1734         return ret;
1735 }
1736
1737 /**
1738  * regulator_get_current_limit - get regulator output current
1739  * @regulator: regulator source
1740  *
1741  * This returns the current supplied by the specified current sink in uA.
1742  *
1743  * NOTE: If the regulator is disabled it will return the current value. This
1744  * function should not be used to determine regulator state.
1745  */
1746 int regulator_get_current_limit(struct regulator *regulator)
1747 {
1748         return _regulator_get_current_limit(regulator->rdev);
1749 }
1750 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1751
1752 /**
1753  * regulator_set_mode - set regulator operating mode
1754  * @regulator: regulator source
1755  * @mode: operating mode - one of the REGULATOR_MODE constants
1756  *
1757  * Set regulator operating mode to increase regulator efficiency or improve
1758  * regulation performance.
1759  *
1760  * NOTE: Regulator system constraints must be set for this regulator before
1761  * calling this function otherwise this call will fail.
1762  */
1763 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1764 {
1765         struct regulator_dev *rdev = regulator->rdev;
1766         int ret;
1767
1768         mutex_lock(&rdev->mutex);
1769
1770         /* sanity check */
1771         if (!rdev->desc->ops->set_mode) {
1772                 ret = -EINVAL;
1773                 goto out;
1774         }
1775
1776         /* constraints check */
1777         ret = regulator_check_mode(rdev, mode);
1778         if (ret < 0)
1779                 goto out;
1780
1781         ret = rdev->desc->ops->set_mode(rdev, mode);
1782 out:
1783         mutex_unlock(&rdev->mutex);
1784         return ret;
1785 }
1786 EXPORT_SYMBOL_GPL(regulator_set_mode);
1787
1788 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1789 {
1790         int ret;
1791
1792         mutex_lock(&rdev->mutex);
1793
1794         /* sanity check */
1795         if (!rdev->desc->ops->get_mode) {
1796                 ret = -EINVAL;
1797                 goto out;
1798         }
1799
1800         ret = rdev->desc->ops->get_mode(rdev);
1801 out:
1802         mutex_unlock(&rdev->mutex);
1803         return ret;
1804 }
1805
1806 /**
1807  * regulator_get_mode - get regulator operating mode
1808  * @regulator: regulator source
1809  *
1810  * Get the current regulator operating mode.
1811  */
1812 unsigned int regulator_get_mode(struct regulator *regulator)
1813 {
1814         return _regulator_get_mode(regulator->rdev);
1815 }
1816 EXPORT_SYMBOL_GPL(regulator_get_mode);
1817
1818 /**
1819  * regulator_set_optimum_mode - set regulator optimum operating mode
1820  * @regulator: regulator source
1821  * @uA_load: load current
1822  *
1823  * Notifies the regulator core of a new device load. This is then used by
1824  * DRMS (if enabled by constraints) to set the most efficient regulator
1825  * operating mode for the new regulator loading.
1826  *
1827  * Consumer devices notify their supply regulator of the maximum power
1828  * they will require (can be taken from device datasheet in the power
1829  * consumption tables) when they change operational status and hence power
1830  * state. Examples of operational state changes that can affect power
1831  * consumption are :-
1832  *
1833  *    o Device is opened / closed.
1834  *    o Device I/O is about to begin or has just finished.
1835  *    o Device is idling in between work.
1836  *
1837  * This information is also exported via sysfs to userspace.
1838  *
1839  * DRMS will sum the total requested load on the regulator and change
1840  * to the most efficient operating mode if platform constraints allow.
1841  *
1842  * Returns the new regulator mode or error.
1843  */
1844 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1845 {
1846         struct regulator_dev *rdev = regulator->rdev;
1847         struct regulator *consumer;
1848         int ret, output_uV, input_uV, total_uA_load = 0;
1849         unsigned int mode;
1850
1851         mutex_lock(&rdev->mutex);
1852
1853         regulator->uA_load = uA_load;
1854         ret = regulator_check_drms(rdev);
1855         if (ret < 0)
1856                 goto out;
1857         ret = -EINVAL;
1858
1859         /* sanity check */
1860         if (!rdev->desc->ops->get_optimum_mode)
1861                 goto out;
1862
1863         /* get output voltage */
1864         output_uV = rdev->desc->ops->get_voltage(rdev);
1865         if (output_uV <= 0) {
1866                 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1867                         __func__, rdev_get_name(rdev));
1868                 goto out;
1869         }
1870
1871         /* get input voltage */
1872         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1873                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1874         else
1875                 input_uV = rdev->constraints->input_uV;
1876         if (input_uV <= 0) {
1877                 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1878                         __func__, rdev_get_name(rdev));
1879                 goto out;
1880         }
1881
1882         /* calc total requested load for this regulator */
1883         list_for_each_entry(consumer, &rdev->consumer_list, list)
1884                 total_uA_load += consumer->uA_load;
1885
1886         mode = rdev->desc->ops->get_optimum_mode(rdev,
1887                                                  input_uV, output_uV,
1888                                                  total_uA_load);
1889         ret = regulator_check_mode(rdev, mode);
1890         if (ret < 0) {
1891                 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1892                         " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev),
1893                         total_uA_load, input_uV, output_uV);
1894                 goto out;
1895         }
1896
1897         ret = rdev->desc->ops->set_mode(rdev, mode);
1898         if (ret < 0) {
1899                 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1900                         __func__, mode, rdev_get_name(rdev));
1901                 goto out;
1902         }
1903         ret = mode;
1904 out:
1905         mutex_unlock(&rdev->mutex);
1906         return ret;
1907 }
1908 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1909
1910 /**
1911  * regulator_register_notifier - register regulator event notifier
1912  * @regulator: regulator source
1913  * @nb: notifier block
1914  *
1915  * Register notifier block to receive regulator events.
1916  */
1917 int regulator_register_notifier(struct regulator *regulator,
1918                               struct notifier_block *nb)
1919 {
1920         return blocking_notifier_chain_register(&regulator->rdev->notifier,
1921                                                 nb);
1922 }
1923 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1924
1925 /**
1926  * regulator_unregister_notifier - unregister regulator event notifier
1927  * @regulator: regulator source
1928  * @nb: notifier block
1929  *
1930  * Unregister regulator event notifier block.
1931  */
1932 int regulator_unregister_notifier(struct regulator *regulator,
1933                                 struct notifier_block *nb)
1934 {
1935         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1936                                                   nb);
1937 }
1938 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1939
1940 /* notify regulator consumers and downstream regulator consumers.
1941  * Note mutex must be held by caller.
1942  */
1943 static void _notifier_call_chain(struct regulator_dev *rdev,
1944                                   unsigned long event, void *data)
1945 {
1946         struct regulator_dev *_rdev;
1947
1948         /* call rdev chain first */
1949         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1950
1951         /* now notify regulator we supply */
1952         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1953                 mutex_lock(&_rdev->mutex);
1954                 _notifier_call_chain(_rdev, event, data);
1955                 mutex_unlock(&_rdev->mutex);
1956         }
1957 }
1958
1959 /**
1960  * regulator_bulk_get - get multiple regulator consumers
1961  *
1962  * @dev:           Device to supply
1963  * @num_consumers: Number of consumers to register
1964  * @consumers:     Configuration of consumers; clients are stored here.
1965  *
1966  * @return 0 on success, an errno on failure.
1967  *
1968  * This helper function allows drivers to get several regulator
1969  * consumers in one operation.  If any of the regulators cannot be
1970  * acquired then any regulators that were allocated will be freed
1971  * before returning to the caller.
1972  */
1973 int regulator_bulk_get(struct device *dev, int num_consumers,
1974                        struct regulator_bulk_data *consumers)
1975 {
1976         int i;
1977         int ret;
1978
1979         for (i = 0; i < num_consumers; i++)
1980                 consumers[i].consumer = NULL;
1981
1982         for (i = 0; i < num_consumers; i++) {
1983                 consumers[i].consumer = regulator_get(dev,
1984                                                       consumers[i].supply);
1985                 if (IS_ERR(consumers[i].consumer)) {
1986                         ret = PTR_ERR(consumers[i].consumer);
1987                         dev_err(dev, "Failed to get supply '%s': %d\n",
1988                                 consumers[i].supply, ret);
1989                         consumers[i].consumer = NULL;
1990                         goto err;
1991                 }
1992         }
1993
1994         return 0;
1995
1996 err:
1997         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1998                 regulator_put(consumers[i].consumer);
1999
2000         return ret;
2001 }
2002 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2003
2004 /**
2005  * regulator_bulk_enable - enable multiple regulator consumers
2006  *
2007  * @num_consumers: Number of consumers
2008  * @consumers:     Consumer data; clients are stored here.
2009  * @return         0 on success, an errno on failure
2010  *
2011  * This convenience API allows consumers to enable multiple regulator
2012  * clients in a single API call.  If any consumers cannot be enabled
2013  * then any others that were enabled will be disabled again prior to
2014  * return.
2015  */
2016 int regulator_bulk_enable(int num_consumers,
2017                           struct regulator_bulk_data *consumers)
2018 {
2019         int i;
2020         int ret;
2021
2022         for (i = 0; i < num_consumers; i++) {
2023                 ret = regulator_enable(consumers[i].consumer);
2024                 if (ret != 0)
2025                         goto err;
2026         }
2027
2028         return 0;
2029
2030 err:
2031         printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret);
2032         for (--i; i >= 0; --i)
2033                 regulator_disable(consumers[i].consumer);
2034
2035         return ret;
2036 }
2037 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2038
2039 /**
2040  * regulator_bulk_disable - disable multiple regulator consumers
2041  *
2042  * @num_consumers: Number of consumers
2043  * @consumers:     Consumer data; clients are stored here.
2044  * @return         0 on success, an errno on failure
2045  *
2046  * This convenience API allows consumers to disable multiple regulator
2047  * clients in a single API call.  If any consumers cannot be enabled
2048  * then any others that were disabled will be disabled again prior to
2049  * return.
2050  */
2051 int regulator_bulk_disable(int num_consumers,
2052                            struct regulator_bulk_data *consumers)
2053 {
2054         int i;
2055         int ret;
2056
2057         for (i = 0; i < num_consumers; i++) {
2058                 ret = regulator_disable(consumers[i].consumer);
2059                 if (ret != 0)
2060                         goto err;
2061         }
2062
2063         return 0;
2064
2065 err:
2066         printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply,
2067                ret);
2068         for (--i; i >= 0; --i)
2069                 regulator_enable(consumers[i].consumer);
2070
2071         return ret;
2072 }
2073 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2074
2075 /**
2076  * regulator_bulk_free - free multiple regulator consumers
2077  *
2078  * @num_consumers: Number of consumers
2079  * @consumers:     Consumer data; clients are stored here.
2080  *
2081  * This convenience API allows consumers to free multiple regulator
2082  * clients in a single API call.
2083  */
2084 void regulator_bulk_free(int num_consumers,
2085                          struct regulator_bulk_data *consumers)
2086 {
2087         int i;
2088
2089         for (i = 0; i < num_consumers; i++) {
2090                 regulator_put(consumers[i].consumer);
2091                 consumers[i].consumer = NULL;
2092         }
2093 }
2094 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2095
2096 /**
2097  * regulator_notifier_call_chain - call regulator event notifier
2098  * @rdev: regulator source
2099  * @event: notifier block
2100  * @data: callback-specific data.
2101  *
2102  * Called by regulator drivers to notify clients a regulator event has
2103  * occurred. We also notify regulator clients downstream.
2104  * Note lock must be held by caller.
2105  */
2106 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2107                                   unsigned long event, void *data)
2108 {
2109         _notifier_call_chain(rdev, event, data);
2110         return NOTIFY_DONE;
2111
2112 }
2113 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2114
2115 /**
2116  * regulator_mode_to_status - convert a regulator mode into a status
2117  *
2118  * @mode: Mode to convert
2119  *
2120  * Convert a regulator mode into a status.
2121  */
2122 int regulator_mode_to_status(unsigned int mode)
2123 {
2124         switch (mode) {
2125         case REGULATOR_MODE_FAST:
2126                 return REGULATOR_STATUS_FAST;
2127         case REGULATOR_MODE_NORMAL:
2128                 return REGULATOR_STATUS_NORMAL;
2129         case REGULATOR_MODE_IDLE:
2130                 return REGULATOR_STATUS_IDLE;
2131         case REGULATOR_STATUS_STANDBY:
2132                 return REGULATOR_STATUS_STANDBY;
2133         default:
2134                 return 0;
2135         }
2136 }
2137 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2138
2139 /*
2140  * To avoid cluttering sysfs (and memory) with useless state, only
2141  * create attributes that can be meaningfully displayed.
2142  */
2143 static int add_regulator_attributes(struct regulator_dev *rdev)
2144 {
2145         struct device           *dev = &rdev->dev;
2146         struct regulator_ops    *ops = rdev->desc->ops;
2147         int                     status = 0;
2148
2149         /* some attributes need specific methods to be displayed */
2150         if (ops->get_voltage) {
2151                 status = device_create_file(dev, &dev_attr_microvolts);
2152                 if (status < 0)
2153                         return status;
2154         }
2155         if (ops->get_current_limit) {
2156                 status = device_create_file(dev, &dev_attr_microamps);
2157                 if (status < 0)
2158                         return status;
2159         }
2160         if (ops->get_mode) {
2161                 status = device_create_file(dev, &dev_attr_opmode);
2162                 if (status < 0)
2163                         return status;
2164         }
2165         if (ops->is_enabled) {
2166                 status = device_create_file(dev, &dev_attr_state);
2167                 if (status < 0)
2168                         return status;
2169         }
2170         if (ops->get_status) {
2171                 status = device_create_file(dev, &dev_attr_status);
2172                 if (status < 0)
2173                         return status;
2174         }
2175
2176         /* some attributes are type-specific */
2177         if (rdev->desc->type == REGULATOR_CURRENT) {
2178                 status = device_create_file(dev, &dev_attr_requested_microamps);
2179                 if (status < 0)
2180                         return status;
2181         }
2182
2183         /* all the other attributes exist to support constraints;
2184          * don't show them if there are no constraints, or if the
2185          * relevant supporting methods are missing.
2186          */
2187         if (!rdev->constraints)
2188                 return status;
2189
2190         /* constraints need specific supporting methods */
2191         if (ops->set_voltage) {
2192                 status = device_create_file(dev, &dev_attr_min_microvolts);
2193                 if (status < 0)
2194                         return status;
2195                 status = device_create_file(dev, &dev_attr_max_microvolts);
2196                 if (status < 0)
2197                         return status;
2198         }
2199         if (ops->set_current_limit) {
2200                 status = device_create_file(dev, &dev_attr_min_microamps);
2201                 if (status < 0)
2202                         return status;
2203                 status = device_create_file(dev, &dev_attr_max_microamps);
2204                 if (status < 0)
2205                         return status;
2206         }
2207
2208         /* suspend mode constraints need multiple supporting methods */
2209         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2210                 return status;
2211
2212         status = device_create_file(dev, &dev_attr_suspend_standby_state);
2213         if (status < 0)
2214                 return status;
2215         status = device_create_file(dev, &dev_attr_suspend_mem_state);
2216         if (status < 0)
2217                 return status;
2218         status = device_create_file(dev, &dev_attr_suspend_disk_state);
2219         if (status < 0)
2220                 return status;
2221
2222         if (ops->set_suspend_voltage) {
2223                 status = device_create_file(dev,
2224                                 &dev_attr_suspend_standby_microvolts);
2225                 if (status < 0)
2226                         return status;
2227                 status = device_create_file(dev,
2228                                 &dev_attr_suspend_mem_microvolts);
2229                 if (status < 0)
2230                         return status;
2231                 status = device_create_file(dev,
2232                                 &dev_attr_suspend_disk_microvolts);
2233                 if (status < 0)
2234                         return status;
2235         }
2236
2237         if (ops->set_suspend_mode) {
2238                 status = device_create_file(dev,
2239                                 &dev_attr_suspend_standby_mode);
2240                 if (status < 0)
2241                         return status;
2242                 status = device_create_file(dev,
2243                                 &dev_attr_suspend_mem_mode);
2244                 if (status < 0)
2245                         return status;
2246                 status = device_create_file(dev,
2247                                 &dev_attr_suspend_disk_mode);
2248                 if (status < 0)
2249                         return status;
2250         }
2251
2252         return status;
2253 }
2254
2255 /**
2256  * regulator_register - register regulator
2257  * @regulator_desc: regulator to register
2258  * @dev: struct device for the regulator
2259  * @init_data: platform provided init data, passed through by driver
2260  * @driver_data: private regulator data
2261  *
2262  * Called by regulator drivers to register a regulator.
2263  * Returns 0 on success.
2264  */
2265 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2266         struct device *dev, struct regulator_init_data *init_data,
2267         void *driver_data)
2268 {
2269         static atomic_t regulator_no = ATOMIC_INIT(0);
2270         struct regulator_dev *rdev;
2271         int ret, i;
2272
2273         if (regulator_desc == NULL)
2274                 return ERR_PTR(-EINVAL);
2275
2276         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2277                 return ERR_PTR(-EINVAL);
2278
2279         if (regulator_desc->type != REGULATOR_VOLTAGE &&
2280             regulator_desc->type != REGULATOR_CURRENT)
2281                 return ERR_PTR(-EINVAL);
2282
2283         if (!init_data)
2284                 return ERR_PTR(-EINVAL);
2285
2286         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2287         if (rdev == NULL)
2288                 return ERR_PTR(-ENOMEM);
2289
2290         mutex_lock(&regulator_list_mutex);
2291
2292         mutex_init(&rdev->mutex);
2293         rdev->reg_data = driver_data;
2294         rdev->owner = regulator_desc->owner;
2295         rdev->desc = regulator_desc;
2296         INIT_LIST_HEAD(&rdev->consumer_list);
2297         INIT_LIST_HEAD(&rdev->supply_list);
2298         INIT_LIST_HEAD(&rdev->list);
2299         INIT_LIST_HEAD(&rdev->slist);
2300         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2301
2302         /* preform any regulator specific init */
2303         if (init_data->regulator_init) {
2304                 ret = init_data->regulator_init(rdev->reg_data);
2305                 if (ret < 0)
2306                         goto clean;
2307         }
2308
2309         /* register with sysfs */
2310         rdev->dev.class = &regulator_class;
2311         rdev->dev.parent = dev;
2312         dev_set_name(&rdev->dev, "regulator.%d",
2313                      atomic_inc_return(&regulator_no) - 1);
2314         ret = device_register(&rdev->dev);
2315         if (ret != 0)
2316                 goto clean;
2317
2318         dev_set_drvdata(&rdev->dev, rdev);
2319
2320         /* set regulator constraints */
2321         ret = set_machine_constraints(rdev, &init_data->constraints);
2322         if (ret < 0)
2323                 goto scrub;
2324
2325         /* add attributes supported by this regulator */
2326         ret = add_regulator_attributes(rdev);
2327         if (ret < 0)
2328                 goto scrub;
2329
2330         /* set supply regulator if it exists */
2331         if (init_data->supply_regulator_dev) {
2332                 ret = set_supply(rdev,
2333                         dev_get_drvdata(init_data->supply_regulator_dev));
2334                 if (ret < 0)
2335                         goto scrub;
2336         }
2337
2338         /* add consumers devices */
2339         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2340                 ret = set_consumer_device_supply(rdev,
2341                         init_data->consumer_supplies[i].dev,
2342                         init_data->consumer_supplies[i].dev_name,
2343                         init_data->consumer_supplies[i].supply);
2344                 if (ret < 0) {
2345                         for (--i; i >= 0; i--)
2346                                 unset_consumer_device_supply(rdev,
2347                                     init_data->consumer_supplies[i].dev_name,
2348                                     init_data->consumer_supplies[i].dev);
2349                         goto scrub;
2350                 }
2351         }
2352
2353         list_add(&rdev->list, &regulator_list);
2354 out:
2355         mutex_unlock(&regulator_list_mutex);
2356         return rdev;
2357
2358 scrub:
2359         device_unregister(&rdev->dev);
2360         /* device core frees rdev */
2361         rdev = ERR_PTR(ret);
2362         goto out;
2363
2364 clean:
2365         kfree(rdev);
2366         rdev = ERR_PTR(ret);
2367         goto out;
2368 }
2369 EXPORT_SYMBOL_GPL(regulator_register);
2370
2371 /**
2372  * regulator_unregister - unregister regulator
2373  * @rdev: regulator to unregister
2374  *
2375  * Called by regulator drivers to unregister a regulator.
2376  */
2377 void regulator_unregister(struct regulator_dev *rdev)
2378 {
2379         if (rdev == NULL)
2380                 return;
2381
2382         mutex_lock(&regulator_list_mutex);
2383         WARN_ON(rdev->open_count);
2384         unset_regulator_supplies(rdev);
2385         list_del(&rdev->list);
2386         if (rdev->supply)
2387                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2388         device_unregister(&rdev->dev);
2389         mutex_unlock(&regulator_list_mutex);
2390 }
2391 EXPORT_SYMBOL_GPL(regulator_unregister);
2392
2393 /**
2394  * regulator_suspend_prepare - prepare regulators for system wide suspend
2395  * @state: system suspend state
2396  *
2397  * Configure each regulator with it's suspend operating parameters for state.
2398  * This will usually be called by machine suspend code prior to supending.
2399  */
2400 int regulator_suspend_prepare(suspend_state_t state)
2401 {
2402         struct regulator_dev *rdev;
2403         int ret = 0;
2404
2405         /* ON is handled by regulator active state */
2406         if (state == PM_SUSPEND_ON)
2407                 return -EINVAL;
2408
2409         mutex_lock(&regulator_list_mutex);
2410         list_for_each_entry(rdev, &regulator_list, list) {
2411
2412                 mutex_lock(&rdev->mutex);
2413                 ret = suspend_prepare(rdev, state);
2414                 mutex_unlock(&rdev->mutex);
2415
2416                 if (ret < 0) {
2417                         printk(KERN_ERR "%s: failed to prepare %s\n",
2418                                 __func__, rdev_get_name(rdev));
2419                         goto out;
2420                 }
2421         }
2422 out:
2423         mutex_unlock(&regulator_list_mutex);
2424         return ret;
2425 }
2426 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2427
2428 /**
2429  * regulator_has_full_constraints - the system has fully specified constraints
2430  *
2431  * Calling this function will cause the regulator API to disable all
2432  * regulators which have a zero use count and don't have an always_on
2433  * constraint in a late_initcall.
2434  *
2435  * The intention is that this will become the default behaviour in a
2436  * future kernel release so users are encouraged to use this facility
2437  * now.
2438  */
2439 void regulator_has_full_constraints(void)
2440 {
2441         has_full_constraints = 1;
2442 }
2443 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2444
2445 /**
2446  * rdev_get_drvdata - get rdev regulator driver data
2447  * @rdev: regulator
2448  *
2449  * Get rdev regulator driver private data. This call can be used in the
2450  * regulator driver context.
2451  */
2452 void *rdev_get_drvdata(struct regulator_dev *rdev)
2453 {
2454         return rdev->reg_data;
2455 }
2456 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2457
2458 /**
2459  * regulator_get_drvdata - get regulator driver data
2460  * @regulator: regulator
2461  *
2462  * Get regulator driver private data. This call can be used in the consumer
2463  * driver context when non API regulator specific functions need to be called.
2464  */
2465 void *regulator_get_drvdata(struct regulator *regulator)
2466 {
2467         return regulator->rdev->reg_data;
2468 }
2469 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2470
2471 /**
2472  * regulator_set_drvdata - set regulator driver data
2473  * @regulator: regulator
2474  * @data: data
2475  */
2476 void regulator_set_drvdata(struct regulator *regulator, void *data)
2477 {
2478         regulator->rdev->reg_data = data;
2479 }
2480 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2481
2482 /**
2483  * regulator_get_id - get regulator ID
2484  * @rdev: regulator
2485  */
2486 int rdev_get_id(struct regulator_dev *rdev)
2487 {
2488         return rdev->desc->id;
2489 }
2490 EXPORT_SYMBOL_GPL(rdev_get_id);
2491
2492 struct device *rdev_get_dev(struct regulator_dev *rdev)
2493 {
2494         return &rdev->dev;
2495 }
2496 EXPORT_SYMBOL_GPL(rdev_get_dev);
2497
2498 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2499 {
2500         return reg_init_data->driver_data;
2501 }
2502 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2503
2504 static int __init regulator_init(void)
2505 {
2506         int ret;
2507
2508         printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2509
2510         ret = class_register(&regulator_class);
2511
2512         regulator_dummy_init();
2513
2514         return ret;
2515 }
2516
2517 /* init early to allow our consumers to complete system booting */
2518 core_initcall(regulator_init);
2519
2520 static int __init regulator_init_complete(void)
2521 {
2522         struct regulator_dev *rdev;
2523         struct regulator_ops *ops;
2524         struct regulation_constraints *c;
2525         int enabled, ret;
2526         const char *name;
2527
2528         mutex_lock(&regulator_list_mutex);
2529
2530         /* If we have a full configuration then disable any regulators
2531          * which are not in use or always_on.  This will become the
2532          * default behaviour in the future.
2533          */
2534         list_for_each_entry(rdev, &regulator_list, list) {
2535                 ops = rdev->desc->ops;
2536                 c = rdev->constraints;
2537
2538                 name = rdev_get_name(rdev);
2539
2540                 if (!ops->disable || (c && c->always_on))
2541                         continue;
2542
2543                 mutex_lock(&rdev->mutex);
2544
2545                 if (rdev->use_count)
2546                         goto unlock;
2547
2548                 /* If we can't read the status assume it's on. */
2549                 if (ops->is_enabled)
2550                         enabled = ops->is_enabled(rdev);
2551                 else
2552                         enabled = 1;
2553
2554                 if (!enabled)
2555                         goto unlock;
2556
2557                 if (has_full_constraints) {
2558                         /* We log since this may kill the system if it
2559                          * goes wrong. */
2560                         printk(KERN_INFO "%s: disabling %s\n",
2561                                __func__, name);
2562                         ret = ops->disable(rdev);
2563                         if (ret != 0) {
2564                                 printk(KERN_ERR
2565                                        "%s: couldn't disable %s: %d\n",
2566                                        __func__, name, ret);
2567                         }
2568                 } else {
2569                         /* The intention is that in future we will
2570                          * assume that full constraints are provided
2571                          * so warn even if we aren't going to do
2572                          * anything here.
2573                          */
2574                         printk(KERN_WARNING
2575                                "%s: incomplete constraints, leaving %s on\n",
2576                                __func__, name);
2577                 }
2578
2579 unlock:
2580                 mutex_unlock(&rdev->mutex);
2581         }
2582
2583         mutex_unlock(&regulator_list_mutex);
2584
2585         return 0;
2586 }
2587 late_initcall(regulator_init_complete);