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         s32 value = dev_pm_qos_requested_resume_latency(dev);
 222
 223         if (value == 0)
 224                 return sprintf(buf, "n/a\n");
 225         else if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
 226                 value = 0;
 227
 228         return sprintf(buf, "%d\n", value);
 229 }
 230
 231 static ssize_t pm_qos_resume_latency_store(struct device *dev,
 232                                            struct device_attribute *attr,
 233                                            const char *buf, size_t n)
 234 {
 235         s32 value;
 236         int ret;
 237
 238         if (!kstrtos32(buf, 0, &value)) {
 239                 /*
 240                  * Prevent users from writing negative or "no constraint" values
 241                  * directly.
 242                  */
 243                 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
 244                         return -EINVAL;
 245
 246                 if (value == 0)
 247                         value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
 248         } else if (!strcmp(buf, "n/a") || !strcmp(buf, "n/a\n")) {
 249                 value = 0;
 250         } else {
 251                 return -EINVAL;
 252         }
 253
 254         ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
 255                                         value);
 256         return ret < 0 ? ret : n;
 257 }
 258
 259 static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
 260                    pm_qos_resume_latency_show, pm_qos_resume_latency_store);
 261
 262 static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
 263                                              struct device_attribute *attr,
 264                                              char *buf)
 265 {
 266         s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
 267
 268         if (value < 0)
 269                 return sprintf(buf, "auto\n");
 270         else if (value == PM_QOS_LATENCY_ANY)
 271                 return sprintf(buf, "any\n");
 272
 273         return sprintf(buf, "%d\n", value);
 274 }
 275
 276 static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
 277                                               struct device_attribute *attr,
 278                                               const char *buf, size_t n)
 279 {
 280         s32 value;
 281         int ret;
 282
 283         if (kstrtos32(buf, 0, &value) == 0) {
 284                 /* Users can't write negative values directly */
 285                 if (value < 0)
 286                         return -EINVAL;
 287         } else {
 288                 if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
 289                         value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
 290                 else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
 291                         value = PM_QOS_LATENCY_ANY;
 292                 else
 293                         return -EINVAL;
 294         }
 295         ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 296         return ret < 0 ? ret : n;
 297 }
 298
 299 static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
 300                    pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
 301
 302 static ssize_t pm_qos_no_power_off_show(struct device *dev,
 303                                         struct device_attribute *attr,
 304                                         char *buf)
 305 {
 306         return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 307                                         & PM_QOS_FLAG_NO_POWER_OFF));
 308 }
 309
 310 static ssize_t pm_qos_no_power_off_store(struct device *dev,
 311                                          struct device_attribute *attr,
 312                                          const char *buf, size_t n)
 313 {
 314         int ret;
 315
 316         if (kstrtoint(buf, 0, &ret))
 317                 return -EINVAL;
 318
 319         if (ret != 0 && ret != 1)
 320                 return -EINVAL;
 321
 322         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
 323         return ret < 0 ? ret : n;
 324 }
 325
 326 static DEVICE_ATTR(pm_qos_no_power_off, 0644,
 327                    pm_qos_no_power_off_show, pm_qos_no_power_off_store);
 328
 329 #ifdef CONFIG_PM_SLEEP
 330 static const char _enabled[] = "enabled";
 331 static const char _disabled[] = "disabled";
 332
 333 static ssize_t
 334 wake_show(struct device * dev, struct device_attribute *attr, char * buf)
 335 {
 336         return sprintf(buf, "%s\n", device_can_wakeup(dev)
 337                 ? (device_may_wakeup(dev) ? _enabled : _disabled)
 338                 : "");
 339 }
 340
 341 static ssize_t
 342 wake_store(struct device * dev, struct device_attribute *attr,
 343         const char * buf, size_t n)
 344 {
 345         char *cp;
 346         int len = n;
 347
 348         if (!device_can_wakeup(dev))
 349                 return -EINVAL;
 350
 351         cp = memchr(buf, '\n', n);
 352         if (cp)
 353                 len = cp - buf;
 354         if (len == sizeof _enabled - 1
 355                         && strncmp(buf, _enabled, sizeof _enabled - 1) == 0)
 356                 device_set_wakeup_enable(dev, 1);
 357         else if (len == sizeof _disabled - 1
 358                         && strncmp(buf, _disabled, sizeof _disabled - 1) == 0)
 359                 device_set_wakeup_enable(dev, 0);
 360         else
 361                 return -EINVAL;
 362         return n;
 363 }
 364
 365 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
 366
 367 static ssize_t wakeup_count_show(struct device *dev,
 368                                 struct device_attribute *attr, char *buf)
 369 {
 370         unsigned long count = 0;
 371         bool enabled = false;
 372
 373         spin_lock_irq(&dev->power.lock);
 374         if (dev->power.wakeup) {
 375                 count = dev->power.wakeup->event_count;
 376                 enabled = true;
 377         }
 378         spin_unlock_irq(&dev->power.lock);
 379         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 380 }
 381
 382 static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
 383
 384 static ssize_t wakeup_active_count_show(struct device *dev,
 385                                 struct device_attribute *attr, char *buf)
 386 {
 387         unsigned long count = 0;
 388         bool enabled = false;
 389
 390         spin_lock_irq(&dev->power.lock);
 391         if (dev->power.wakeup) {
 392                 count = dev->power.wakeup->active_count;
 393                 enabled = true;
 394         }
 395         spin_unlock_irq(&dev->power.lock);
 396         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 397 }
 398
 399 static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
 400
 401 static ssize_t wakeup_abort_count_show(struct device *dev,
 402                                         struct device_attribute *attr,
 403                                         char *buf)
 404 {
 405         unsigned long count = 0;
 406         bool enabled = false;
 407
 408         spin_lock_irq(&dev->power.lock);
 409         if (dev->power.wakeup) {
 410                 count = dev->power.wakeup->wakeup_count;
 411                 enabled = true;
 412         }
 413         spin_unlock_irq(&dev->power.lock);
 414         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 415 }
 416
 417 static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
 418
 419 static ssize_t wakeup_expire_count_show(struct device *dev,
 420                                         struct device_attribute *attr,
 421                                         char *buf)
 422 {
 423         unsigned long count = 0;
 424         bool enabled = false;
 425
 426         spin_lock_irq(&dev->power.lock);
 427         if (dev->power.wakeup) {
 428                 count = dev->power.wakeup->expire_count;
 429                 enabled = true;
 430         }
 431         spin_unlock_irq(&dev->power.lock);
 432         return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
 433 }
 434
 435 static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
 436
 437 static ssize_t wakeup_active_show(struct device *dev,
 438                                 struct device_attribute *attr, char *buf)
 439 {
 440         unsigned int active = 0;
 441         bool enabled = false;
 442
 443         spin_lock_irq(&dev->power.lock);
 444         if (dev->power.wakeup) {
 445                 active = dev->power.wakeup->active;
 446                 enabled = true;
 447         }
 448         spin_unlock_irq(&dev->power.lock);
 449         return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
 450 }
 451
 452 static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
 453
 454 static ssize_t wakeup_total_time_show(struct device *dev,
 455                                 struct device_attribute *attr, char *buf)
 456 {
 457         s64 msec = 0;
 458         bool enabled = false;
 459
 460         spin_lock_irq(&dev->power.lock);
 461         if (dev->power.wakeup) {
 462                 msec = ktime_to_ms(dev->power.wakeup->total_time);
 463                 enabled = true;
 464         }
 465         spin_unlock_irq(&dev->power.lock);
 466         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 467 }
 468
 469 static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
 470
 471 static ssize_t wakeup_max_time_show(struct device *dev,
 472                                 struct device_attribute *attr, char *buf)
 473 {
 474         s64 msec = 0;
 475         bool enabled = false;
 476
 477         spin_lock_irq(&dev->power.lock);
 478         if (dev->power.wakeup) {
 479                 msec = ktime_to_ms(dev->power.wakeup->max_time);
 480                 enabled = true;
 481         }
 482         spin_unlock_irq(&dev->power.lock);
 483         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 484 }
 485
 486 static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
 487
 488 static ssize_t wakeup_last_time_show(struct device *dev,
 489                                 struct device_attribute *attr, char *buf)
 490 {
 491         s64 msec = 0;
 492         bool enabled = false;
 493
 494         spin_lock_irq(&dev->power.lock);
 495         if (dev->power.wakeup) {
 496                 msec = ktime_to_ms(dev->power.wakeup->last_time);
 497                 enabled = true;
 498         }
 499         spin_unlock_irq(&dev->power.lock);
 500         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 501 }
 502
 503 static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
 504
 505 #ifdef CONFIG_PM_AUTOSLEEP
 506 static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
 507                                               struct device_attribute *attr,
 508                                               char *buf)
 509 {
 510         s64 msec = 0;
 511         bool enabled = false;
 512
 513         spin_lock_irq(&dev->power.lock);
 514         if (dev->power.wakeup) {
 515                 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
 516                 enabled = true;
 517         }
 518         spin_unlock_irq(&dev->power.lock);
 519         return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
 520 }
 521
 522 static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
 523                    wakeup_prevent_sleep_time_show, NULL);
 524 #endif /* CONFIG_PM_AUTOSLEEP */
 525 #endif /* CONFIG_PM_SLEEP */
 526
 527 #ifdef CONFIG_PM_ADVANCED_DEBUG
 528 static ssize_t rtpm_usagecount_show(struct device *dev,
 529                                     struct device_attribute *attr, char *buf)
 530 {
 531         return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
 532 }
 533
 534 static ssize_t rtpm_children_show(struct device *dev,
 535                                   struct device_attribute *attr, char *buf)
 536 {
 537         return sprintf(buf, "%d\n", dev->power.ignore_children ?
 538                 0 : atomic_read(&dev->power.child_count));
 539 }
 540
 541 static ssize_t rtpm_enabled_show(struct device *dev,
 542                                  struct device_attribute *attr, char *buf)
 543 {
 544         if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
 545                 return sprintf(buf, "disabled & forbidden\n");
 546         else if (dev->power.disable_depth)
 547                 return sprintf(buf, "disabled\n");
 548         else if (dev->power.runtime_auto == false)
 549                 return sprintf(buf, "forbidden\n");
 550         return sprintf(buf, "enabled\n");
 551 }
 552
 553 static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
 554 static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
 555 static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
 556
 557 #ifdef CONFIG_PM_SLEEP
 558 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 559                           char *buf)
 560 {
 561         return sprintf(buf, "%s\n",
 562                         device_async_suspend_enabled(dev) ?
 563                                 _enabled : _disabled);
 564 }
 565
 566 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 567                            const char *buf, size_t n)
 568 {
 569         char *cp;
 570         int len = n;
 571
 572         cp = memchr(buf, '\n', n);
 573         if (cp)
 574                 len = cp - buf;
 575         if (len == sizeof _enabled - 1 && strncmp(buf, _enabled, len) == 0)
 576                 device_enable_async_suspend(dev);
 577         else if (len == sizeof _disabled - 1 &&
 578                  strncmp(buf, _disabled, len) == 0)
 579                 device_disable_async_suspend(dev);
 580         else
 581                 return -EINVAL;
 582         return n;
 583 }
 584
 585 static DEVICE_ATTR(async, 0644, async_show, async_store);
 586
 587 #endif /* CONFIG_PM_SLEEP */
 588 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 589
 590 static struct attribute *power_attrs[] = {
 591 #ifdef CONFIG_PM_ADVANCED_DEBUG
 592 #ifdef CONFIG_PM_SLEEP
 593         &dev_attr_async.attr,
 594 #endif
 595         &dev_attr_runtime_status.attr,
 596         &dev_attr_runtime_usage.attr,
 597         &dev_attr_runtime_active_kids.attr,
 598         &dev_attr_runtime_enabled.attr,
 599 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 600         NULL,
 601 };
 602 static const struct attribute_group pm_attr_group = {
 603         .name   = power_group_name,
 604         .attrs  = power_attrs,
 605 };
 606
 607 static struct attribute *wakeup_attrs[] = {
 608 #ifdef CONFIG_PM_SLEEP
 609         &dev_attr_wakeup.attr,
 610         &dev_attr_wakeup_count.attr,
 611         &dev_attr_wakeup_active_count.attr,
 612         &dev_attr_wakeup_abort_count.attr,
 613         &dev_attr_wakeup_expire_count.attr,
 614         &dev_attr_wakeup_active.attr,
 615         &dev_attr_wakeup_total_time_ms.attr,
 616         &dev_attr_wakeup_max_time_ms.attr,
 617         &dev_attr_wakeup_last_time_ms.attr,
 618 #ifdef CONFIG_PM_AUTOSLEEP
 619         &dev_attr_wakeup_prevent_sleep_time_ms.attr,
 620 #endif
 621 #endif
 622         NULL,
 623 };
 624 static const struct attribute_group pm_wakeup_attr_group = {
 625         .name   = power_group_name,
 626         .attrs  = wakeup_attrs,
 627 };
 628
 629 static struct attribute *runtime_attrs[] = {
 630 #ifndef CONFIG_PM_ADVANCED_DEBUG
 631         &dev_attr_runtime_status.attr,
 632 #endif
 633         &dev_attr_control.attr,
 634         &dev_attr_runtime_suspended_time.attr,
 635         &dev_attr_runtime_active_time.attr,
 636         &dev_attr_autosuspend_delay_ms.attr,
 637         NULL,
 638 };
 639 static const struct attribute_group pm_runtime_attr_group = {
 640         .name   = power_group_name,
 641         .attrs  = runtime_attrs,
 642 };
 643
 644 static struct attribute *pm_qos_resume_latency_attrs[] = {
 645         &dev_attr_pm_qos_resume_latency_us.attr,
 646         NULL,
 647 };
 648 static const struct attribute_group pm_qos_resume_latency_attr_group = {
 649         .name   = power_group_name,
 650         .attrs  = pm_qos_resume_latency_attrs,
 651 };
 652
 653 static struct attribute *pm_qos_latency_tolerance_attrs[] = {
 654         &dev_attr_pm_qos_latency_tolerance_us.attr,
 655         NULL,
 656 };
 657 static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
 658         .name   = power_group_name,
 659         .attrs  = pm_qos_latency_tolerance_attrs,
 660 };
 661
 662 static struct attribute *pm_qos_flags_attrs[] = {
 663         &dev_attr_pm_qos_no_power_off.attr,
 664         NULL,
 665 };
 666 static const struct attribute_group pm_qos_flags_attr_group = {
 667         .name   = power_group_name,
 668         .attrs  = pm_qos_flags_attrs,
 669 };
 670
 671 int dpm_sysfs_add(struct device *dev)
 672 {
 673         int rc;
 674
 675         rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
 676         if (rc)
 677                 return rc;
 678
 679         if (pm_runtime_callbacks_present(dev)) {
 680                 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
 681                 if (rc)
 682                         goto err_out;
 683         }
 684         if (device_can_wakeup(dev)) {
 685                 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 686                 if (rc)
 687                         goto err_runtime;
 688         }
 689         if (dev->power.set_latency_tolerance) {
 690                 rc = sysfs_merge_group(&dev->kobj,
 691                                        &pm_qos_latency_tolerance_attr_group);
 692                 if (rc)
 693                         goto err_wakeup;
 694         }
 695         return 0;
 696
 697  err_wakeup:
 698         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 699  err_runtime:
 700         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 701  err_out:
 702         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 703         return rc;
 704 }
 705
 706 int wakeup_sysfs_add(struct device *dev)
 707 {
 708         return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 709 }
 710
 711 void wakeup_sysfs_remove(struct device *dev)
 712 {
 713         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 714 }
 715
 716 int pm_qos_sysfs_add_resume_latency(struct device *dev)
 717 {
 718         return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 719 }
 720
 721 void pm_qos_sysfs_remove_resume_latency(struct device *dev)
 722 {
 723         sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 724 }
 725
 726 int pm_qos_sysfs_add_flags(struct device *dev)
 727 {
 728         return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
 729 }
 730
 731 void pm_qos_sysfs_remove_flags(struct device *dev)
 732 {
 733         sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
 734 }
 735
 736 int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
 737 {
 738         return sysfs_merge_group(&dev->kobj,
 739                                  &pm_qos_latency_tolerance_attr_group);
 740 }
 741
 742 void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
 743 {
 744         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 745 }
 746
 747 void rpm_sysfs_remove(struct device *dev)
 748 {
 749         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 750 }
 751
 752 void dpm_sysfs_remove(struct device *dev)
 753 {
 754         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 755         dev_pm_qos_constraints_destroy(dev);
 756         rpm_sysfs_remove(dev);
 757         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 758         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 759 }