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)) {
 267                 if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
 268                         value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
 269                 else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
 270                         value = PM_QOS_LATENCY_ANY;
 271         }
 272         ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 273         return ret < 0 ? ret : n;
 274 }
 275
 276 static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
 277                    pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
 278
 279 static ssize_t pm_qos_no_power_off_show(struct device *dev,
 280                                         struct device_attribute *attr,
 281                                         char *buf)
 282 {
 283         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 284                                         & PM_QOS_FLAG_NO_POWER_OFF));
 285 }
 286
 287 static ssize_t pm_qos_no_power_off_store(struct device *dev,
 288                                          struct device_attribute *attr,
 289                                          const char *buf, size_t n)
 290 {
 291         int ret;
 292
 293         if (kstrtoint(buf, 0, &ret))
 294                 return -EINVAL;
 295
 296         if (ret != 0 && ret != 1)
 297                 return -EINVAL;
 298
 299         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
 300         return ret < 0 ? ret : n;
 301 }
 302
 303 static DEVICE_ATTR(pm_qos_no_power_off, 0644,
 304                    pm_qos_no_power_off_show, pm_qos_no_power_off_store);
 305
 306 static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
 307                                          struct device_attribute *attr,
 308                                          char *buf)
 309 {
 310         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 311                                         & PM_QOS_FLAG_REMOTE_WAKEUP));
 312 }
 313
 314 static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
 315                                           struct device_attribute *attr,
 316                                           const char *buf, size_t n)
 317 {
 318         int ret;
 319
 320         if (kstrtoint(buf, 0, &ret))
 321                 return -EINVAL;
 322
 323         if (ret != 0 && ret != 1)
 324                 return -EINVAL;
 325
 326         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP, ret);
 327         return ret < 0 ? ret : n;
 328 }
 329
 330 static DEVICE_ATTR(pm_qos_remote_wakeup, 0644,
 331                    pm_qos_remote_wakeup_show, pm_qos_remote_wakeup_store);
 332
 333 #ifdef CONFIG_PM_SLEEP
 334 static const char _enabled[] = "enabled";
 335 static const char _disabled[] = "disabled";
 336
 337 static ssize_t
 338 wake_show(struct device * dev, struct device_attribute *attr, char * buf)
 339 {
 340         return sprintf(buf, "%s\n", device_can_wakeup(dev)
 341                 ? (device_may_wakeup(dev) ? _enabled : _disabled)
 342                 : "");
 343 }
 344
 345 static ssize_t
 346 wake_store(struct device * dev, struct device_attribute *attr,
 347         const char * buf, size_t n)
 348 {
 349         char *cp;
 350         int len = n;
 351
 352         if (!device_can_wakeup(dev))
 353                 return -EINVAL;
 354
 355         cp = memchr(buf, '\n', n);
 356         if (cp)
 357                 len = cp - buf;
 358         if (len == sizeof _enabled - 1
 359                         && strncmp(buf, _enabled, sizeof _enabled - 1) == 0)
 360                 device_set_wakeup_enable(dev, 1);
 361         else if (len == sizeof _disabled - 1
 362                         && strncmp(buf, _disabled, sizeof _disabled - 1) == 0)
 363                 device_set_wakeup_enable(dev, 0);
 364         else
 365                 return -EINVAL;
 366         return n;
 367 }
 368
 369 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
 370
 371 static ssize_t wakeup_count_show(struct device *dev,
 372                                 struct device_attribute *attr, char *buf)
 373 {
 374         unsigned long count = 0;
 375         bool enabled = false;
 376
 377         spin_lock_irq(&dev->power.lock);
 378         if (dev->power.wakeup) {
 379                 count = dev->power.wakeup->event_count;
 380                 enabled = true;
 381         }
 382         spin_unlock_irq(&dev->power.lock);
 383         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 384 }
 385
 386 static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
 387
 388 static ssize_t wakeup_active_count_show(struct device *dev,
 389                                 struct device_attribute *attr, char *buf)
 390 {
 391         unsigned long count = 0;
 392         bool enabled = false;
 393
 394         spin_lock_irq(&dev->power.lock);
 395         if (dev->power.wakeup) {
 396                 count = dev->power.wakeup->active_count;
 397                 enabled = true;
 398         }
 399         spin_unlock_irq(&dev->power.lock);
 400         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 401 }
 402
 403 static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
 404
 405 static ssize_t wakeup_abort_count_show(struct device *dev,
 406                                         struct device_attribute *attr,
 407                                         char *buf)
 408 {
 409         unsigned long count = 0;
 410         bool enabled = false;
 411
 412         spin_lock_irq(&dev->power.lock);
 413         if (dev->power.wakeup) {
 414                 count = dev->power.wakeup->wakeup_count;
 415                 enabled = true;
 416         }
 417         spin_unlock_irq(&dev->power.lock);
 418         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 419 }
 420
 421 static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
 422
 423 static ssize_t wakeup_expire_count_show(struct device *dev,
 424                                         struct device_attribute *attr,
 425                                         char *buf)
 426 {
 427         unsigned long count = 0;
 428         bool enabled = false;
 429
 430         spin_lock_irq(&dev->power.lock);
 431         if (dev->power.wakeup) {
 432                 count = dev->power.wakeup->expire_count;
 433                 enabled = true;
 434         }
 435         spin_unlock_irq(&dev->power.lock);
 436         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 437 }
 438
 439 static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
 440
 441 static ssize_t wakeup_active_show(struct device *dev,
 442                                 struct device_attribute *attr, char *buf)
 443 {
 444         unsigned int active = 0;
 445         bool enabled = false;
 446
 447         spin_lock_irq(&dev->power.lock);
 448         if (dev->power.wakeup) {
 449                 active = dev->power.wakeup->active;
 450                 enabled = true;
 451         }
 452         spin_unlock_irq(&dev->power.lock);
 453         return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
 454 }
 455
 456 static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
 457
 458 static ssize_t wakeup_total_time_show(struct device *dev,
 459                                 struct device_attribute *attr, char *buf)
 460 {
 461         s64 msec = 0;
 462         bool enabled = false;
 463
 464         spin_lock_irq(&dev->power.lock);
 465         if (dev->power.wakeup) {
 466                 msec = ktime_to_ms(dev->power.wakeup->total_time);
 467                 enabled = true;
 468         }
 469         spin_unlock_irq(&dev->power.lock);
 470         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 471 }
 472
 473 static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
 474
 475 static ssize_t wakeup_max_time_show(struct device *dev,
 476                                 struct device_attribute *attr, char *buf)
 477 {
 478         s64 msec = 0;
 479         bool enabled = false;
 480
 481         spin_lock_irq(&dev->power.lock);
 482         if (dev->power.wakeup) {
 483                 msec = ktime_to_ms(dev->power.wakeup->max_time);
 484                 enabled = true;
 485         }
 486         spin_unlock_irq(&dev->power.lock);
 487         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 488 }
 489
 490 static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
 491
 492 static ssize_t wakeup_last_time_show(struct device *dev,
 493                                 struct device_attribute *attr, char *buf)
 494 {
 495         s64 msec = 0;
 496         bool enabled = false;
 497
 498         spin_lock_irq(&dev->power.lock);
 499         if (dev->power.wakeup) {
 500                 msec = ktime_to_ms(dev->power.wakeup->last_time);
 501                 enabled = true;
 502         }
 503         spin_unlock_irq(&dev->power.lock);
 504         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 505 }
 506
 507 static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
 508
 509 #ifdef CONFIG_PM_AUTOSLEEP
 510 static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
 511                                               struct device_attribute *attr,
 512                                               char *buf)
 513 {
 514         s64 msec = 0;
 515         bool enabled = false;
 516
 517         spin_lock_irq(&dev->power.lock);
 518         if (dev->power.wakeup) {
 519                 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
 520                 enabled = true;
 521         }
 522         spin_unlock_irq(&dev->power.lock);
 523         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 524 }
 525
 526 static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
 527                    wakeup_prevent_sleep_time_show, NULL);
 528 #endif /* CONFIG_PM_AUTOSLEEP */
 529 #endif /* CONFIG_PM_SLEEP */
 530
 531 #ifdef CONFIG_PM_ADVANCED_DEBUG
 532 static ssize_t rtpm_usagecount_show(struct device *dev,
 533                                     struct device_attribute *attr, char *buf)
 534 {
 535         return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
 536 }
 537
 538 static ssize_t rtpm_children_show(struct device *dev,
 539                                   struct device_attribute *attr, char *buf)
 540 {
 541         return sprintf(buf, "%d\n", dev->power.ignore_children ?
 542                 0 : atomic_read(&dev->power.child_count));
 543 }
 544
 545 static ssize_t rtpm_enabled_show(struct device *dev,
 546                                  struct device_attribute *attr, char *buf)
 547 {
 548         if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
 549                 return sprintf(buf, "disabled & forbidden\n");
 550         else if (dev->power.disable_depth)
 551                 return sprintf(buf, "disabled\n");
 552         else if (dev->power.runtime_auto == false)
 553                 return sprintf(buf, "forbidden\n");
 554         return sprintf(buf, "enabled\n");
 555 }
 556
 557 static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
 558 static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
 559 static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
 560
 561 #ifdef CONFIG_PM_SLEEP
 562 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 563                           char *buf)
 564 {
 565         return sprintf(buf, "%s\n",
 566                         device_async_suspend_enabled(dev) ?
 567                                 _enabled : _disabled);
 568 }
 569
 570 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 571                            const char *buf, size_t n)
 572 {
 573         char *cp;
 574         int len = n;
 575
 576         cp = memchr(buf, '\n', n);
 577         if (cp)
 578                 len = cp - buf;
 579         if (len == sizeof _enabled - 1 && strncmp(buf, _enabled, len) == 0)
 580                 device_enable_async_suspend(dev);
 581         else if (len == sizeof _disabled - 1 &&
 582                  strncmp(buf, _disabled, len) == 0)
 583                 device_disable_async_suspend(dev);
 584         else
 585                 return -EINVAL;
 586         return n;
 587 }
 588
 589 static DEVICE_ATTR(async, 0644, async_show, async_store);
 590
 591 #endif /* CONFIG_PM_SLEEP */
 592 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 593
 594 static struct attribute *power_attrs[] = {
 595 #ifdef CONFIG_PM_ADVANCED_DEBUG
 596 #ifdef CONFIG_PM_SLEEP
 597         &dev_attr_async.attr,
 598 #endif
 599         &dev_attr_runtime_status.attr,
 600         &dev_attr_runtime_usage.attr,
 601         &dev_attr_runtime_active_kids.attr,
 602         &dev_attr_runtime_enabled.attr,
 603 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 604         NULL,
 605 };
 606 static struct attribute_group pm_attr_group = {
 607         .name   = power_group_name,
 608         .attrs  = power_attrs,
 609 };
 610
 611 static struct attribute *wakeup_attrs[] = {
 612 #ifdef CONFIG_PM_SLEEP
 613         &dev_attr_wakeup.attr,
 614         &dev_attr_wakeup_count.attr,
 615         &dev_attr_wakeup_active_count.attr,
 616         &dev_attr_wakeup_abort_count.attr,
 617         &dev_attr_wakeup_expire_count.attr,
 618         &dev_attr_wakeup_active.attr,
 619         &dev_attr_wakeup_total_time_ms.attr,
 620         &dev_attr_wakeup_max_time_ms.attr,
 621         &dev_attr_wakeup_last_time_ms.attr,
 622 #ifdef CONFIG_PM_AUTOSLEEP
 623         &dev_attr_wakeup_prevent_sleep_time_ms.attr,
 624 #endif
 625 #endif
 626         NULL,
 627 };
 628 static struct attribute_group pm_wakeup_attr_group = {
 629         .name   = power_group_name,
 630         .attrs  = wakeup_attrs,
 631 };
 632
 633 static struct attribute *runtime_attrs[] = {
 634 #ifndef CONFIG_PM_ADVANCED_DEBUG
 635         &dev_attr_runtime_status.attr,
 636 #endif
 637         &dev_attr_control.attr,
 638         &dev_attr_runtime_suspended_time.attr,
 639         &dev_attr_runtime_active_time.attr,
 640         &dev_attr_autosuspend_delay_ms.attr,
 641         NULL,
 642 };
 643 static struct attribute_group pm_runtime_attr_group = {
 644         .name   = power_group_name,
 645         .attrs  = runtime_attrs,
 646 };
 647
 648 static struct attribute *pm_qos_resume_latency_attrs[] = {
 649         &dev_attr_pm_qos_resume_latency_us.attr,
 650         NULL,
 651 };
 652 static struct attribute_group pm_qos_resume_latency_attr_group = {
 653         .name   = power_group_name,
 654         .attrs  = pm_qos_resume_latency_attrs,
 655 };
 656
 657 static struct attribute *pm_qos_latency_tolerance_attrs[] = {
 658         &dev_attr_pm_qos_latency_tolerance_us.attr,
 659         NULL,
 660 };
 661 static struct attribute_group pm_qos_latency_tolerance_attr_group = {
 662         .name   = power_group_name,
 663         .attrs  = pm_qos_latency_tolerance_attrs,
 664 };
 665
 666 static struct attribute *pm_qos_flags_attrs[] = {
 667         &dev_attr_pm_qos_no_power_off.attr,
 668         &dev_attr_pm_qos_remote_wakeup.attr,
 669         NULL,
 670 };
 671 static struct attribute_group pm_qos_flags_attr_group = {
 672         .name   = power_group_name,
 673         .attrs  = pm_qos_flags_attrs,
 674 };
 675
 676 int dpm_sysfs_add(struct device *dev)
 677 {
 678         int rc;
 679
 680         rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
 681         if (rc)
 682                 return rc;
 683
 684         if (pm_runtime_callbacks_present(dev)) {
 685                 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
 686                 if (rc)
 687                         goto err_out;
 688         }
 689         if (device_can_wakeup(dev)) {
 690                 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 691                 if (rc)
 692                         goto err_runtime;
 693         }
 694         if (dev->power.set_latency_tolerance) {
 695                 rc = sysfs_merge_group(&dev->kobj,
 696                                        &pm_qos_latency_tolerance_attr_group);
 697                 if (rc)
 698                         goto err_wakeup;
 699         }
 700         return 0;
 701
 702  err_wakeup:
 703         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 704  err_runtime:
 705         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 706  err_out:
 707         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 708         return rc;
 709 }
 710
 711 int wakeup_sysfs_add(struct device *dev)
 712 {
 713         return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 714 }
 715
 716 void wakeup_sysfs_remove(struct device *dev)
 717 {
 718         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 719 }
 720
 721 int pm_qos_sysfs_add_resume_latency(struct device *dev)
 722 {
 723         return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 724 }
 725
 726 void pm_qos_sysfs_remove_resume_latency(struct device *dev)
 727 {
 728         sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 729 }
 730
 731 int pm_qos_sysfs_add_flags(struct device *dev)
 732 {
 733         return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
 734 }
 735
 736 void pm_qos_sysfs_remove_flags(struct device *dev)
 737 {
 738         sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
 739 }
 740
 741 int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
 742 {
 743         return sysfs_merge_group(&dev->kobj,
 744                                  &pm_qos_latency_tolerance_attr_group);
 745 }
 746
 747 void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
 748 {
 749         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 750 }
 751
 752 void rpm_sysfs_remove(struct device *dev)
 753 {
 754         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 755 }
 756
 757 void dpm_sysfs_remove(struct device *dev)
 758 {
 759         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 760         dev_pm_qos_constraints_destroy(dev);
 761         rpm_sysfs_remove(dev);
 762         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 763         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 764 }