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                 else
 272                         return -EINVAL;
 273         }
 274         ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 275         return ret < 0 ? ret : n;
 276 }
 277
 278 static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
 279                    pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
 280
 281 static ssize_t pm_qos_no_power_off_show(struct device *dev,
 282                                         struct device_attribute *attr,
 283                                         char *buf)
 284 {
 285         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 286                                         & PM_QOS_FLAG_NO_POWER_OFF));
 287 }
 288
 289 static ssize_t pm_qos_no_power_off_store(struct device *dev,
 290                                          struct device_attribute *attr,
 291                                          const char *buf, size_t n)
 292 {
 293         int ret;
 294
 295         if (kstrtoint(buf, 0, &ret))
 296                 return -EINVAL;
 297
 298         if (ret != 0 && ret != 1)
 299                 return -EINVAL;
 300
 301         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
 302         return ret < 0 ? ret : n;
 303 }
 304
 305 static DEVICE_ATTR(pm_qos_no_power_off, 0644,
 306                    pm_qos_no_power_off_show, pm_qos_no_power_off_store);
 307
 308 static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
 309                                          struct device_attribute *attr,
 310                                          char *buf)
 311 {
 312         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 313                                         & PM_QOS_FLAG_REMOTE_WAKEUP));
 314 }
 315
 316 static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
 317                                           struct device_attribute *attr,
 318                                           const char *buf, size_t n)
 319 {
 320         int ret;
 321
 322         if (kstrtoint(buf, 0, &ret))
 323                 return -EINVAL;
 324
 325         if (ret != 0 && ret != 1)
 326                 return -EINVAL;
 327
 328         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP, ret);
 329         return ret < 0 ? ret : n;
 330 }
 331
 332 static DEVICE_ATTR(pm_qos_remote_wakeup, 0644,
 333                    pm_qos_remote_wakeup_show, pm_qos_remote_wakeup_store);
 334
 335 #ifdef CONFIG_PM_SLEEP
 336 static const char _enabled[] = "enabled";
 337 static const char _disabled[] = "disabled";
 338
 339 static ssize_t
 340 wake_show(struct device * dev, struct device_attribute *attr, char * buf)
 341 {
 342         return sprintf(buf, "%s\n", device_can_wakeup(dev)
 343                 ? (device_may_wakeup(dev) ? _enabled : _disabled)
 344                 : "");
 345 }
 346
 347 static ssize_t
 348 wake_store(struct device * dev, struct device_attribute *attr,
 349         const char * buf, size_t n)
 350 {
 351         char *cp;
 352         int len = n;
 353
 354         if (!device_can_wakeup(dev))
 355                 return -EINVAL;
 356
 357         cp = memchr(buf, '\n', n);
 358         if (cp)
 359                 len = cp - buf;
 360         if (len == sizeof _enabled - 1
 361                         && strncmp(buf, _enabled, sizeof _enabled - 1) == 0)
 362                 device_set_wakeup_enable(dev, 1);
 363         else if (len == sizeof _disabled - 1
 364                         && strncmp(buf, _disabled, sizeof _disabled - 1) == 0)
 365                 device_set_wakeup_enable(dev, 0);
 366         else
 367                 return -EINVAL;
 368         return n;
 369 }
 370
 371 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
 372
 373 static ssize_t wakeup_count_show(struct device *dev,
 374                                 struct device_attribute *attr, char *buf)
 375 {
 376         unsigned long count = 0;
 377         bool enabled = false;
 378
 379         spin_lock_irq(&dev->power.lock);
 380         if (dev->power.wakeup) {
 381                 count = dev->power.wakeup->event_count;
 382                 enabled = true;
 383         }
 384         spin_unlock_irq(&dev->power.lock);
 385         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 386 }
 387
 388 static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
 389
 390 static ssize_t wakeup_active_count_show(struct device *dev,
 391                                 struct device_attribute *attr, char *buf)
 392 {
 393         unsigned long count = 0;
 394         bool enabled = false;
 395
 396         spin_lock_irq(&dev->power.lock);
 397         if (dev->power.wakeup) {
 398                 count = dev->power.wakeup->active_count;
 399                 enabled = true;
 400         }
 401         spin_unlock_irq(&dev->power.lock);
 402         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 403 }
 404
 405 static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
 406
 407 static ssize_t wakeup_abort_count_show(struct device *dev,
 408                                         struct device_attribute *attr,
 409                                         char *buf)
 410 {
 411         unsigned long count = 0;
 412         bool enabled = false;
 413
 414         spin_lock_irq(&dev->power.lock);
 415         if (dev->power.wakeup) {
 416                 count = dev->power.wakeup->wakeup_count;
 417                 enabled = true;
 418         }
 419         spin_unlock_irq(&dev->power.lock);
 420         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 421 }
 422
 423 static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
 424
 425 static ssize_t wakeup_expire_count_show(struct device *dev,
 426                                         struct device_attribute *attr,
 427                                         char *buf)
 428 {
 429         unsigned long count = 0;
 430         bool enabled = false;
 431
 432         spin_lock_irq(&dev->power.lock);
 433         if (dev->power.wakeup) {
 434                 count = dev->power.wakeup->expire_count;
 435                 enabled = true;
 436         }
 437         spin_unlock_irq(&dev->power.lock);
 438         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 439 }
 440
 441 static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
 442
 443 static ssize_t wakeup_active_show(struct device *dev,
 444                                 struct device_attribute *attr, char *buf)
 445 {
 446         unsigned int active = 0;
 447         bool enabled = false;
 448
 449         spin_lock_irq(&dev->power.lock);
 450         if (dev->power.wakeup) {
 451                 active = dev->power.wakeup->active;
 452                 enabled = true;
 453         }
 454         spin_unlock_irq(&dev->power.lock);
 455         return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
 456 }
 457
 458 static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
 459
 460 static ssize_t wakeup_total_time_show(struct device *dev,
 461                                 struct device_attribute *attr, char *buf)
 462 {
 463         s64 msec = 0;
 464         bool enabled = false;
 465
 466         spin_lock_irq(&dev->power.lock);
 467         if (dev->power.wakeup) {
 468                 msec = ktime_to_ms(dev->power.wakeup->total_time);
 469                 enabled = true;
 470         }
 471         spin_unlock_irq(&dev->power.lock);
 472         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 473 }
 474
 475 static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
 476
 477 static ssize_t wakeup_max_time_show(struct device *dev,
 478                                 struct device_attribute *attr, char *buf)
 479 {
 480         s64 msec = 0;
 481         bool enabled = false;
 482
 483         spin_lock_irq(&dev->power.lock);
 484         if (dev->power.wakeup) {
 485                 msec = ktime_to_ms(dev->power.wakeup->max_time);
 486                 enabled = true;
 487         }
 488         spin_unlock_irq(&dev->power.lock);
 489         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 490 }
 491
 492 static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
 493
 494 static ssize_t wakeup_last_time_show(struct device *dev,
 495                                 struct device_attribute *attr, char *buf)
 496 {
 497         s64 msec = 0;
 498         bool enabled = false;
 499
 500         spin_lock_irq(&dev->power.lock);
 501         if (dev->power.wakeup) {
 502                 msec = ktime_to_ms(dev->power.wakeup->last_time);
 503                 enabled = true;
 504         }
 505         spin_unlock_irq(&dev->power.lock);
 506         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 507 }
 508
 509 static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
 510
 511 #ifdef CONFIG_PM_AUTOSLEEP
 512 static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
 513                                               struct device_attribute *attr,
 514                                               char *buf)
 515 {
 516         s64 msec = 0;
 517         bool enabled = false;
 518
 519         spin_lock_irq(&dev->power.lock);
 520         if (dev->power.wakeup) {
 521                 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
 522                 enabled = true;
 523         }
 524         spin_unlock_irq(&dev->power.lock);
 525         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 526 }
 527
 528 static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
 529                    wakeup_prevent_sleep_time_show, NULL);
 530 #endif /* CONFIG_PM_AUTOSLEEP */
 531 #endif /* CONFIG_PM_SLEEP */
 532
 533 #ifdef CONFIG_PM_ADVANCED_DEBUG
 534 static ssize_t rtpm_usagecount_show(struct device *dev,
 535                                     struct device_attribute *attr, char *buf)
 536 {
 537         return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
 538 }
 539
 540 static ssize_t rtpm_children_show(struct device *dev,
 541                                   struct device_attribute *attr, char *buf)
 542 {
 543         return sprintf(buf, "%d\n", dev->power.ignore_children ?
 544                 0 : atomic_read(&dev->power.child_count));
 545 }
 546
 547 static ssize_t rtpm_enabled_show(struct device *dev,
 548                                  struct device_attribute *attr, char *buf)
 549 {
 550         if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
 551                 return sprintf(buf, "disabled & forbidden\n");
 552         else if (dev->power.disable_depth)
 553                 return sprintf(buf, "disabled\n");
 554         else if (dev->power.runtime_auto == false)
 555                 return sprintf(buf, "forbidden\n");
 556         return sprintf(buf, "enabled\n");
 557 }
 558
 559 static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
 560 static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
 561 static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
 562
 563 #ifdef CONFIG_PM_SLEEP
 564 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 565                           char *buf)
 566 {
 567         return sprintf(buf, "%s\n",
 568                         device_async_suspend_enabled(dev) ?
 569                                 _enabled : _disabled);
 570 }
 571
 572 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 573                            const char *buf, size_t n)
 574 {
 575         char *cp;
 576         int len = n;
 577
 578         cp = memchr(buf, '\n', n);
 579         if (cp)
 580                 len = cp - buf;
 581         if (len == sizeof _enabled - 1 && strncmp(buf, _enabled, len) == 0)
 582                 device_enable_async_suspend(dev);
 583         else if (len == sizeof _disabled - 1 &&
 584                  strncmp(buf, _disabled, len) == 0)
 585                 device_disable_async_suspend(dev);
 586         else
 587                 return -EINVAL;
 588         return n;
 589 }
 590
 591 static DEVICE_ATTR(async, 0644, async_show, async_store);
 592
 593 #endif /* CONFIG_PM_SLEEP */
 594 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 595
 596 static struct attribute *power_attrs[] = {
 597 #ifdef CONFIG_PM_ADVANCED_DEBUG
 598 #ifdef CONFIG_PM_SLEEP
 599         &dev_attr_async.attr,
 600 #endif
 601         &dev_attr_runtime_status.attr,
 602         &dev_attr_runtime_usage.attr,
 603         &dev_attr_runtime_active_kids.attr,
 604         &dev_attr_runtime_enabled.attr,
 605 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 606         NULL,
 607 };
 608 static struct attribute_group pm_attr_group = {
 609         .name   = power_group_name,
 610         .attrs  = power_attrs,
 611 };
 612
 613 static struct attribute *wakeup_attrs[] = {
 614 #ifdef CONFIG_PM_SLEEP
 615         &dev_attr_wakeup.attr,
 616         &dev_attr_wakeup_count.attr,
 617         &dev_attr_wakeup_active_count.attr,
 618         &dev_attr_wakeup_abort_count.attr,
 619         &dev_attr_wakeup_expire_count.attr,
 620         &dev_attr_wakeup_active.attr,
 621         &dev_attr_wakeup_total_time_ms.attr,
 622         &dev_attr_wakeup_max_time_ms.attr,
 623         &dev_attr_wakeup_last_time_ms.attr,
 624 #ifdef CONFIG_PM_AUTOSLEEP
 625         &dev_attr_wakeup_prevent_sleep_time_ms.attr,
 626 #endif
 627 #endif
 628         NULL,
 629 };
 630 static struct attribute_group pm_wakeup_attr_group = {
 631         .name   = power_group_name,
 632         .attrs  = wakeup_attrs,
 633 };
 634
 635 static struct attribute *runtime_attrs[] = {
 636 #ifndef CONFIG_PM_ADVANCED_DEBUG
 637         &dev_attr_runtime_status.attr,
 638 #endif
 639         &dev_attr_control.attr,
 640         &dev_attr_runtime_suspended_time.attr,
 641         &dev_attr_runtime_active_time.attr,
 642         &dev_attr_autosuspend_delay_ms.attr,
 643         NULL,
 644 };
 645 static struct attribute_group pm_runtime_attr_group = {
 646         .name   = power_group_name,
 647         .attrs  = runtime_attrs,
 648 };
 649
 650 static struct attribute *pm_qos_resume_latency_attrs[] = {
 651         &dev_attr_pm_qos_resume_latency_us.attr,
 652         NULL,
 653 };
 654 static struct attribute_group pm_qos_resume_latency_attr_group = {
 655         .name   = power_group_name,
 656         .attrs  = pm_qos_resume_latency_attrs,
 657 };
 658
 659 static struct attribute *pm_qos_latency_tolerance_attrs[] = {
 660         &dev_attr_pm_qos_latency_tolerance_us.attr,
 661         NULL,
 662 };
 663 static struct attribute_group pm_qos_latency_tolerance_attr_group = {
 664         .name   = power_group_name,
 665         .attrs  = pm_qos_latency_tolerance_attrs,
 666 };
 667
 668 static struct attribute *pm_qos_flags_attrs[] = {
 669         &dev_attr_pm_qos_no_power_off.attr,
 670         &dev_attr_pm_qos_remote_wakeup.attr,
 671         NULL,
 672 };
 673 static struct attribute_group pm_qos_flags_attr_group = {
 674         .name   = power_group_name,
 675         .attrs  = pm_qos_flags_attrs,
 676 };
 677
 678 int dpm_sysfs_add(struct device *dev)
 679 {
 680         int rc;
 681
 682         rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
 683         if (rc)
 684                 return rc;
 685
 686         if (pm_runtime_callbacks_present(dev)) {
 687                 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
 688                 if (rc)
 689                         goto err_out;
 690         }
 691         if (device_can_wakeup(dev)) {
 692                 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 693                 if (rc)
 694                         goto err_runtime;
 695         }
 696         if (dev->power.set_latency_tolerance) {
 697                 rc = sysfs_merge_group(&dev->kobj,
 698                                        &pm_qos_latency_tolerance_attr_group);
 699                 if (rc)
 700                         goto err_wakeup;
 701         }
 702         return 0;
 703
 704  err_wakeup:
 705         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 706  err_runtime:
 707         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 708  err_out:
 709         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 710         return rc;
 711 }
 712
 713 int wakeup_sysfs_add(struct device *dev)
 714 {
 715         return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 716 }
 717
 718 void wakeup_sysfs_remove(struct device *dev)
 719 {
 720         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 721 }
 722
 723 int pm_qos_sysfs_add_resume_latency(struct device *dev)
 724 {
 725         return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 726 }
 727
 728 void pm_qos_sysfs_remove_resume_latency(struct device *dev)
 729 {
 730         sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 731 }
 732
 733 int pm_qos_sysfs_add_flags(struct device *dev)
 734 {
 735         return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
 736 }
 737
 738 void pm_qos_sysfs_remove_flags(struct device *dev)
 739 {
 740         sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
 741 }
 742
 743 int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
 744 {
 745         return sysfs_merge_group(&dev->kobj,
 746                                  &pm_qos_latency_tolerance_attr_group);
 747 }
 748
 749 void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
 750 {
 751         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 752 }
 753
 754 void rpm_sysfs_remove(struct device *dev)
 755 {
 756         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 757 }
 758
 759 void dpm_sysfs_remove(struct device *dev)
 760 {
 761         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 762         dev_pm_qos_constraints_destroy(dev);
 763         rpm_sysfs_remove(dev);
 764         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 765         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 766 }