drivers/base/power/sysfs.c

   1 /*
   2  * drivers/base/power/sysfs.c - sysfs entries for device PM
   3  */
   4
   5 #include <linux/device.h>
   6 #include <linux/string.h>
   7 #include <linux/export.h>
   8 #include <linux/pm_qos.h>
   9 #include <linux/pm_runtime.h>
  10 #include <linux/atomic.h>
  11 #include <linux/jiffies.h>
  12 #include "power.h"
  13
  14 /*
  15  *      control - Report/change current runtime PM setting of the device
  16  *
  17  *      Runtime power management of a device can be blocked with the help of
  18  *      this attribute.  All devices have one of the following two values for
  19  *      the power/control file:
  20  *
  21  *       + "auto\n" to allow the device to be power managed at run time;
  22  *       + "on\n" to prevent the device from being power managed at run time;
  23  *
  24  *      The default for all devices is "auto", which means that devices may be
  25  *      subject to automatic power management, depending on their drivers.
  26  *      Changing this attribute to "on" prevents the driver from power managing
  27  *      the device at run time.  Doing that while the device is suspended causes
  28  *      it to be woken up.
  29  *
  30  *      wakeup - Report/change current wakeup option for device
  31  *
  32  *      Some devices support "wakeup" events, which are hardware signals
  33  *      used to activate devices from suspended or low power states.  Such
  34  *      devices have one of three values for the sysfs power/wakeup file:
  35  *
  36  *       + "enabled\n" to issue the events;
  37  *       + "disabled\n" not to do so; or
  38  *       + "\n" for temporary or permanent inability to issue wakeup.
  39  *
  40  *      (For example, unconfigured USB devices can't issue wakeups.)
  41  *
  42  *      Familiar examples of devices that can issue wakeup events include
  43  *      keyboards and mice (both PS2 and USB styles), power buttons, modems,
  44  *      "Wake-On-LAN" Ethernet links, GPIO lines, and more.  Some events
  45  *      will wake the entire system from a suspend state; others may just
  46  *      wake up the device (if the system as a whole is already active).
  47  *      Some wakeup events use normal IRQ lines; other use special out
  48  *      of band signaling.
  49  *
  50  *      It is the responsibility of device drivers to enable (or disable)
  51  *      wakeup signaling as part of changing device power states, respecting
  52  *      the policy choices provided through the driver model.
  53  *
  54  *      Devices may not be able to generate wakeup events from all power
  55  *      states.  Also, the events may be ignored in some configurations;
  56  *      for example, they might need help from other devices that aren't
  57  *      active, or which may have wakeup disabled.  Some drivers rely on
  58  *      wakeup events internally (unless they are disabled), keeping
  59  *      their hardware in low power modes whenever they're unused.  This
  60  *      saves runtime power, without requiring system-wide sleep states.
  61  *
  62  *      async - Report/change current async suspend setting for the device
  63  *
  64  *      Asynchronous suspend and resume of the device during system-wide power
  65  *      state transitions can be enabled by writing "enabled" to this file.
  66  *      Analogously, if "disabled" is written to this file, the device will be
  67  *      suspended and resumed synchronously.
  68  *
  69  *      All devices have one of the following two values for power/async:
  70  *
  71  *       + "enabled\n" to permit the asynchronous suspend/resume of the device;
  72  *       + "disabled\n" to forbid it;
  73  *
  74  *      NOTE: It generally is unsafe to permit the asynchronous suspend/resume
  75  *      of a device unless it is certain that all of the PM dependencies of the
  76  *      device are known to the PM core.  However, for some devices this
  77  *      attribute is set to "enabled" by bus type code or device drivers and in
  78  *      that cases it should be safe to leave the default value.
  79  *
  80  *      autosuspend_delay_ms - Report/change a device's autosuspend_delay value
  81  *
  82  *      Some drivers don't want to carry out a runtime suspend as soon as a
  83  *      device becomes idle; they want it always to remain idle for some period
  84  *      of time before suspending it.  This period is the autosuspend_delay
  85  *      value (expressed in milliseconds) and it can be controlled by the user.
  86  *      If the value is negative then the device will never be runtime
  87  *      suspended.
  88  *
  89  *      NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
  90  *      value are used only if the driver calls pm_runtime_use_autosuspend().
  91  *
  92  *      wakeup_count - Report the number of wakeup events related to the device
  93  */
  94
  95 const char power_group_name[] = "power";
  96 EXPORT_SYMBOL_GPL(power_group_name);
  97
  98 static const char ctrl_auto[] = "auto";
  99 static const char ctrl_on[] = "on";
 100
 101 static ssize_t control_show(struct device *dev, struct device_attribute *attr,
 102                             char *buf)
 103 {
 104         return sprintf(buf, "%s\n",
 105                                 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
 106 }
 107
 108 static ssize_t control_store(struct device * dev, struct device_attribute *attr,
 109                              const char * buf, size_t n)
 110 {
 111         char *cp;
 112         int len = n;
 113
 114         cp = memchr(buf, '\n', n);
 115         if (cp)
 116                 len = cp - buf;
 117         device_lock(dev);
 118         if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
 119                 pm_runtime_allow(dev);
 120         else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
 121                 pm_runtime_forbid(dev);
 122         else
 123                 n = -EINVAL;
 124         device_unlock(dev);
 125         return n;
 126 }
 127
 128 static DEVICE_ATTR(control, 0644, control_show, control_store);
 129
 130 static ssize_t rtpm_active_time_show(struct device *dev,
 131                                 struct device_attribute *attr, char *buf)
 132 {
 133         int ret;
 134         spin_lock_irq(&dev->power.lock);
 135         update_pm_runtime_accounting(dev);
 136         ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
 137         spin_unlock_irq(&dev->power.lock);
 138         return ret;
 139 }
 140
 141 static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
 142
 143 static ssize_t rtpm_suspended_time_show(struct device *dev,
 144                                 struct device_attribute *attr, char *buf)
 145 {
 146         int ret;
 147         spin_lock_irq(&dev->power.lock);
 148         update_pm_runtime_accounting(dev);
 149         ret = sprintf(buf, "%i\n",
 150                 jiffies_to_msecs(dev->power.suspended_jiffies));
 151         spin_unlock_irq(&dev->power.lock);
 152         return ret;
 153 }
 154
 155 static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
 156
 157 static ssize_t rtpm_status_show(struct device *dev,
 158                                 struct device_attribute *attr, char *buf)
 159 {
 160         const char *p;
 161
 162         if (dev->power.runtime_error) {
 163                 p = "error\n";
 164         } else if (dev->power.disable_depth) {
 165                 p = "unsupported\n";
 166         } else {
 167                 switch (dev->power.runtime_status) {
 168                 case RPM_SUSPENDED:
 169                         p = "suspended\n";
 170                         break;
 171                 case RPM_SUSPENDING:
 172                         p = "suspending\n";
 173                         break;
 174                 case RPM_RESUMING:
 175                         p = "resuming\n";
 176                         break;
 177                 case RPM_ACTIVE:
 178                         p = "active\n";
 179                         break;
 180                 default:
 181                         return -EIO;
 182                 }
 183         }
 184         return sprintf(buf, p);
 185 }
 186
 187 static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
 188
 189 static ssize_t autosuspend_delay_ms_show(struct device *dev,
 190                 struct device_attribute *attr, char *buf)
 191 {
 192         if (!dev->power.use_autosuspend)
 193                 return -EIO;
 194         return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
 195 }
 196
 197 static ssize_t autosuspend_delay_ms_store(struct device *dev,
 198                 struct device_attribute *attr, const char *buf, size_t n)
 199 {
 200         long delay;
 201
 202         if (!dev->power.use_autosuspend)
 203                 return -EIO;
 204
 205         if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
 206                 return -EINVAL;
 207
 208         device_lock(dev);
 209         pm_runtime_set_autosuspend_delay(dev, delay);
 210         device_unlock(dev);
 211         return n;
 212 }
 213
 214 static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
 215                 autosuspend_delay_ms_store);
 216
 217 static ssize_t pm_qos_resume_latency_show(struct device *dev,
 218                                           struct device_attribute *attr,
 219                                           char *buf)
 220 {
 221         return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
 222 }
 223
 224 static ssize_t pm_qos_resume_latency_store(struct device *dev,
 225                                            struct device_attribute *attr,
 226                                            const char *buf, size_t n)
 227 {
 228         s32 value;
 229         int ret;
 230
 231         if (kstrtos32(buf, 0, &value))
 232                 return -EINVAL;
 233
 234         if (value < 0)
 235                 return -EINVAL;
 236
 237         ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
 238                                         value);
 239         return ret < 0 ? ret : n;
 240 }
 241
 242 static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
 243                    pm_qos_resume_latency_show, pm_qos_resume_latency_store);
 244
 245 static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
 246                                              struct device_attribute *attr,
 247                                              char *buf)
 248 {
 249         s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
 250
 251         if (value < 0)
 252                 return sprintf(buf, "auto\n");
 253         else if (value == PM_QOS_LATENCY_ANY)
 254                 return sprintf(buf, "any\n");
 255
 256         return sprintf(buf, "%d\n", value);
 257 }
 258
 259 static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
 260                                               struct device_attribute *attr,
 261                                               const char *buf, size_t n)
 262 {
 263         s32 value;
 264         int ret;
 265
 266         if (kstrtos32(buf, 0, &value) == 0) {
 267                 /* Users can't write negative values directly */
 268                 if (value < 0)
 269                         return -EINVAL;
 270         } else {
 271                 if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
 272                         value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
 273                 else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
 274                         value = PM_QOS_LATENCY_ANY;
 275         }
 276         ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 277         return ret < 0 ? ret : n;
 278 }
 279
 280 static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
 281                    pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
 282
 283 static ssize_t pm_qos_no_power_off_show(struct device *dev,
 284                                         struct device_attribute *attr,
 285                                         char *buf)
 286 {
 287         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 288                                         & PM_QOS_FLAG_NO_POWER_OFF));
 289 }
 290
 291 static ssize_t pm_qos_no_power_off_store(struct device *dev,
 292                                          struct device_attribute *attr,
 293                                          const char *buf, size_t n)
 294 {
 295         int ret;
 296
 297         if (kstrtoint(buf, 0, &ret))
 298                 return -EINVAL;
 299
 300         if (ret != 0 && ret != 1)
 301                 return -EINVAL;
 302
 303         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
 304         return ret < 0 ? ret : n;
 305 }
 306
 307 static DEVICE_ATTR(pm_qos_no_power_off, 0644,
 308                    pm_qos_no_power_off_show, pm_qos_no_power_off_store);
 309
 310 static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
 311                                          struct device_attribute *attr,
 312                                          char *buf)
 313 {
 314         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 315                                         & PM_QOS_FLAG_REMOTE_WAKEUP));
 316 }
 317
 318 static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
 319                                           struct device_attribute *attr,
 320                                           const char *buf, size_t n)
 321 {
 322         int ret;
 323
 324         if (kstrtoint(buf, 0, &ret))
 325                 return -EINVAL;
 326
 327         if (ret != 0 && ret != 1)
 328                 return -EINVAL;
 329
 330         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP, ret);
 331         return ret < 0 ? ret : n;
 332 }
 333
 334 static DEVICE_ATTR(pm_qos_remote_wakeup, 0644,
 335                    pm_qos_remote_wakeup_show, pm_qos_remote_wakeup_store);
 336
 337 #ifdef CONFIG_PM_SLEEP
 338 static const char _enabled[] = "enabled";
 339 static const char _disabled[] = "disabled";
 340
 341 static ssize_t
 342 wake_show(struct device * dev, struct device_attribute *attr, char * buf)
 343 {
 344         return sprintf(buf, "%s\n", device_can_wakeup(dev)
 345                 ? (device_may_wakeup(dev) ? _enabled : _disabled)
 346                 : "");
 347 }
 348
 349 static ssize_t
 350 wake_store(struct device * dev, struct device_attribute *attr,
 351         const char * buf, size_t n)
 352 {
 353         char *cp;
 354         int len = n;
 355
 356         if (!device_can_wakeup(dev))
 357                 return -EINVAL;
 358
 359         cp = memchr(buf, '\n', n);
 360         if (cp)
 361                 len = cp - buf;
 362         if (len == sizeof _enabled - 1
 363                         && strncmp(buf, _enabled, sizeof _enabled - 1) == 0)
 364                 device_set_wakeup_enable(dev, 1);
 365         else if (len == sizeof _disabled - 1
 366                         && strncmp(buf, _disabled, sizeof _disabled - 1) == 0)
 367                 device_set_wakeup_enable(dev, 0);
 368         else
 369                 return -EINVAL;
 370         return n;
 371 }
 372
 373 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
 374
 375 static ssize_t wakeup_count_show(struct device *dev,
 376                                 struct device_attribute *attr, char *buf)
 377 {
 378         unsigned long count = 0;
 379         bool enabled = false;
 380
 381         spin_lock_irq(&dev->power.lock);
 382         if (dev->power.wakeup) {
 383                 count = dev->power.wakeup->event_count;
 384                 enabled = true;
 385         }
 386         spin_unlock_irq(&dev->power.lock);
 387         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 388 }
 389
 390 static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
 391
 392 static ssize_t wakeup_active_count_show(struct device *dev,
 393                                 struct device_attribute *attr, char *buf)
 394 {
 395         unsigned long count = 0;
 396         bool enabled = false;
 397
 398         spin_lock_irq(&dev->power.lock);
 399         if (dev->power.wakeup) {
 400                 count = dev->power.wakeup->active_count;
 401                 enabled = true;
 402         }
 403         spin_unlock_irq(&dev->power.lock);
 404         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 405 }
 406
 407 static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
 408
 409 static ssize_t wakeup_abort_count_show(struct device *dev,
 410                                         struct device_attribute *attr,
 411                                         char *buf)
 412 {
 413         unsigned long count = 0;
 414         bool enabled = false;
 415
 416         spin_lock_irq(&dev->power.lock);
 417         if (dev->power.wakeup) {
 418                 count = dev->power.wakeup->wakeup_count;
 419                 enabled = true;
 420         }
 421         spin_unlock_irq(&dev->power.lock);
 422         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 423 }
 424
 425 static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
 426
 427 static ssize_t wakeup_expire_count_show(struct device *dev,
 428                                         struct device_attribute *attr,
 429                                         char *buf)
 430 {
 431         unsigned long count = 0;
 432         bool enabled = false;
 433
 434         spin_lock_irq(&dev->power.lock);
 435         if (dev->power.wakeup) {
 436                 count = dev->power.wakeup->expire_count;
 437                 enabled = true;
 438         }
 439         spin_unlock_irq(&dev->power.lock);
 440         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 441 }
 442
 443 static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
 444
 445 static ssize_t wakeup_active_show(struct device *dev,
 446                                 struct device_attribute *attr, char *buf)
 447 {
 448         unsigned int active = 0;
 449         bool enabled = false;
 450
 451         spin_lock_irq(&dev->power.lock);
 452         if (dev->power.wakeup) {
 453                 active = dev->power.wakeup->active;
 454                 enabled = true;
 455         }
 456         spin_unlock_irq(&dev->power.lock);
 457         return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
 458 }
 459
 460 static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
 461
 462 static ssize_t wakeup_total_time_show(struct device *dev,
 463                                 struct device_attribute *attr, char *buf)
 464 {
 465         s64 msec = 0;
 466         bool enabled = false;
 467
 468         spin_lock_irq(&dev->power.lock);
 469         if (dev->power.wakeup) {
 470                 msec = ktime_to_ms(dev->power.wakeup->total_time);
 471                 enabled = true;
 472         }
 473         spin_unlock_irq(&dev->power.lock);
 474         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 475 }
 476
 477 static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
 478
 479 static ssize_t wakeup_max_time_show(struct device *dev,
 480                                 struct device_attribute *attr, char *buf)
 481 {
 482         s64 msec = 0;
 483         bool enabled = false;
 484
 485         spin_lock_irq(&dev->power.lock);
 486         if (dev->power.wakeup) {
 487                 msec = ktime_to_ms(dev->power.wakeup->max_time);
 488                 enabled = true;
 489         }
 490         spin_unlock_irq(&dev->power.lock);
 491         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 492 }
 493
 494 static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
 495
 496 static ssize_t wakeup_last_time_show(struct device *dev,
 497                                 struct device_attribute *attr, char *buf)
 498 {
 499         s64 msec = 0;
 500         bool enabled = false;
 501
 502         spin_lock_irq(&dev->power.lock);
 503         if (dev->power.wakeup) {
 504                 msec = ktime_to_ms(dev->power.wakeup->last_time);
 505                 enabled = true;
 506         }
 507         spin_unlock_irq(&dev->power.lock);
 508         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 509 }
 510
 511 static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
 512
 513 #ifdef CONFIG_PM_AUTOSLEEP
 514 static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
 515                                               struct device_attribute *attr,
 516                                               char *buf)
 517 {
 518         s64 msec = 0;
 519         bool enabled = false;
 520
 521         spin_lock_irq(&dev->power.lock);
 522         if (dev->power.wakeup) {
 523                 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
 524                 enabled = true;
 525         }
 526         spin_unlock_irq(&dev->power.lock);
 527         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 528 }
 529
 530 static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
 531                    wakeup_prevent_sleep_time_show, NULL);
 532 #endif /* CONFIG_PM_AUTOSLEEP */
 533 #endif /* CONFIG_PM_SLEEP */
 534
 535 #ifdef CONFIG_PM_ADVANCED_DEBUG
 536 static ssize_t rtpm_usagecount_show(struct device *dev,
 537                                     struct device_attribute *attr, char *buf)
 538 {
 539         return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
 540 }
 541
 542 static ssize_t rtpm_children_show(struct device *dev,
 543                                   struct device_attribute *attr, char *buf)
 544 {
 545         return sprintf(buf, "%d\n", dev->power.ignore_children ?
 546                 0 : atomic_read(&dev->power.child_count));
 547 }
 548
 549 static ssize_t rtpm_enabled_show(struct device *dev,
 550                                  struct device_attribute *attr, char *buf)
 551 {
 552         if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
 553                 return sprintf(buf, "disabled & forbidden\n");
 554         else if (dev->power.disable_depth)
 555                 return sprintf(buf, "disabled\n");
 556         else if (dev->power.runtime_auto == false)
 557                 return sprintf(buf, "forbidden\n");
 558         return sprintf(buf, "enabled\n");
 559 }
 560
 561 static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
 562 static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
 563 static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
 564
 565 #ifdef CONFIG_PM_SLEEP
 566 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 567                           char *buf)
 568 {
 569         return sprintf(buf, "%s\n",
 570                         device_async_suspend_enabled(dev) ?
 571                                 _enabled : _disabled);
 572 }
 573
 574 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 575                            const char *buf, size_t n)
 576 {
 577         char *cp;
 578         int len = n;
 579
 580         cp = memchr(buf, '\n', n);
 581         if (cp)
 582                 len = cp - buf;
 583         if (len == sizeof _enabled - 1 && strncmp(buf, _enabled, len) == 0)
 584                 device_enable_async_suspend(dev);
 585         else if (len == sizeof _disabled - 1 &&
 586                  strncmp(buf, _disabled, len) == 0)
 587                 device_disable_async_suspend(dev);
 588         else
 589                 return -EINVAL;
 590         return n;
 591 }
 592
 593 static DEVICE_ATTR(async, 0644, async_show, async_store);
 594
 595 #endif /* CONFIG_PM_SLEEP */
 596 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 597
 598 static struct attribute *power_attrs[] = {
 599 #ifdef CONFIG_PM_ADVANCED_DEBUG
 600 #ifdef CONFIG_PM_SLEEP
 601         &dev_attr_async.attr,
 602 #endif
 603         &dev_attr_runtime_status.attr,
 604         &dev_attr_runtime_usage.attr,
 605         &dev_attr_runtime_active_kids.attr,
 606         &dev_attr_runtime_enabled.attr,
 607 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 608         NULL,
 609 };
 610 static struct attribute_group pm_attr_group = {
 611         .name   = power_group_name,
 612         .attrs  = power_attrs,
 613 };
 614
 615 static struct attribute *wakeup_attrs[] = {
 616 #ifdef CONFIG_PM_SLEEP
 617         &dev_attr_wakeup.attr,
 618         &dev_attr_wakeup_count.attr,
 619         &dev_attr_wakeup_active_count.attr,
 620         &dev_attr_wakeup_abort_count.attr,
 621         &dev_attr_wakeup_expire_count.attr,
 622         &dev_attr_wakeup_active.attr,
 623         &dev_attr_wakeup_total_time_ms.attr,
 624         &dev_attr_wakeup_max_time_ms.attr,
 625         &dev_attr_wakeup_last_time_ms.attr,
 626 #ifdef CONFIG_PM_AUTOSLEEP
 627         &dev_attr_wakeup_prevent_sleep_time_ms.attr,
 628 #endif
 629 #endif
 630         NULL,
 631 };
 632 static struct attribute_group pm_wakeup_attr_group = {
 633         .name   = power_group_name,
 634         .attrs  = wakeup_attrs,
 635 };
 636
 637 static struct attribute *runtime_attrs[] = {
 638 #ifndef CONFIG_PM_ADVANCED_DEBUG
 639         &dev_attr_runtime_status.attr,
 640 #endif
 641         &dev_attr_control.attr,
 642         &dev_attr_runtime_suspended_time.attr,
 643         &dev_attr_runtime_active_time.attr,
 644         &dev_attr_autosuspend_delay_ms.attr,
 645         NULL,
 646 };
 647 static struct attribute_group pm_runtime_attr_group = {
 648         .name   = power_group_name,
 649         .attrs  = runtime_attrs,
 650 };
 651
 652 static struct attribute *pm_qos_resume_latency_attrs[] = {
 653         &dev_attr_pm_qos_resume_latency_us.attr,
 654         NULL,
 655 };
 656 static struct attribute_group pm_qos_resume_latency_attr_group = {
 657         .name   = power_group_name,
 658         .attrs  = pm_qos_resume_latency_attrs,
 659 };
 660
 661 static struct attribute *pm_qos_latency_tolerance_attrs[] = {
 662         &dev_attr_pm_qos_latency_tolerance_us.attr,
 663         NULL,
 664 };
 665 static struct attribute_group pm_qos_latency_tolerance_attr_group = {
 666         .name   = power_group_name,
 667         .attrs  = pm_qos_latency_tolerance_attrs,
 668 };
 669
 670 static struct attribute *pm_qos_flags_attrs[] = {
 671         &dev_attr_pm_qos_no_power_off.attr,
 672         &dev_attr_pm_qos_remote_wakeup.attr,
 673         NULL,
 674 };
 675 static struct attribute_group pm_qos_flags_attr_group = {
 676         .name   = power_group_name,
 677         .attrs  = pm_qos_flags_attrs,
 678 };
 679
 680 int dpm_sysfs_add(struct device *dev)
 681 {
 682         int rc;
 683
 684         rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
 685         if (rc)
 686                 return rc;
 687
 688         if (pm_runtime_callbacks_present(dev)) {
 689                 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
 690                 if (rc)
 691                         goto err_out;
 692         }
 693         if (device_can_wakeup(dev)) {
 694                 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 695                 if (rc)
 696                         goto err_runtime;
 697         }
 698         if (dev->power.set_latency_tolerance) {
 699                 rc = sysfs_merge_group(&dev->kobj,
 700                                        &pm_qos_latency_tolerance_attr_group);
 701                 if (rc)
 702                         goto err_wakeup;
 703         }
 704         return 0;
 705
 706  err_wakeup:
 707         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 708  err_runtime:
 709         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 710  err_out:
 711         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 712         return rc;
 713 }
 714
 715 int wakeup_sysfs_add(struct device *dev)
 716 {
 717         return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 718 }
 719
 720 void wakeup_sysfs_remove(struct device *dev)
 721 {
 722         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 723 }
 724
 725 int pm_qos_sysfs_add_resume_latency(struct device *dev)
 726 {
 727         return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 728 }
 729
 730 void pm_qos_sysfs_remove_resume_latency(struct device *dev)
 731 {
 732         sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 733 }
 734
 735 int pm_qos_sysfs_add_flags(struct device *dev)
 736 {
 737         return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
 738 }
 739
 740 void pm_qos_sysfs_remove_flags(struct device *dev)
 741 {
 742         sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
 743 }
 744
 745 int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
 746 {
 747         return sysfs_merge_group(&dev->kobj,
 748                                  &pm_qos_latency_tolerance_attr_group);
 749 }
 750
 751 void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
 752 {
 753         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 754 }
 755
 756 void rpm_sysfs_remove(struct device *dev)
 757 {
 758         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 759 }
 760
 761 void dpm_sysfs_remove(struct device *dev)
 762 {
 763         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 764         dev_pm_qos_constraints_destroy(dev);
 765         rpm_sysfs_remove(dev);
 766         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 767         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 768 }