drivers/base/power/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* sysfs entries for device PM */
   3 #include <linux/device.h>
   4 #include <linux/kobject.h>
   5 #include <linux/string.h>
   6 #include <linux/export.h>
   7 #include <linux/pm_qos.h>
   8 #include <linux/pm_runtime.h>
   9 #include <linux/pm_wakeup.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 sysfs_emit(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         device_lock(dev);
 112         if (sysfs_streq(buf, ctrl_auto))
 113                 pm_runtime_allow(dev);
 114         else if (sysfs_streq(buf, ctrl_on))
 115                 pm_runtime_forbid(dev);
 116         else
 117                 n = -EINVAL;
 118         device_unlock(dev);
 119         return n;
 120 }
 121
 122 static DEVICE_ATTR_RW(control);
 123
 124 static ssize_t runtime_active_time_show(struct device *dev,
 125                                         struct device_attribute *attr,
 126                                         char *buf)
 127 {
 128         u64 tmp = pm_runtime_active_time(dev);
 129
 130         do_div(tmp, NSEC_PER_MSEC);
 131
 132         return sysfs_emit(buf, "%llu\n", tmp);
 133 }
 134
 135 static DEVICE_ATTR_RO(runtime_active_time);
 136
 137 static ssize_t runtime_suspended_time_show(struct device *dev,
 138                                            struct device_attribute *attr,
 139                                            char *buf)
 140 {
 141         u64 tmp = pm_runtime_suspended_time(dev);
 142
 143         do_div(tmp, NSEC_PER_MSEC);
 144
 145         return sysfs_emit(buf, "%llu\n", tmp);
 146 }
 147
 148 static DEVICE_ATTR_RO(runtime_suspended_time);
 149
 150 static ssize_t runtime_status_show(struct device *dev,
 151                                    struct device_attribute *attr, char *buf)
 152 {
 153         const char *output;
 154
 155         if (dev->power.runtime_error) {
 156                 output = "error";
 157         } else if (dev->power.disable_depth) {
 158                 output = "unsupported";
 159         } else {
 160                 switch (dev->power.runtime_status) {
 161                 case RPM_SUSPENDED:
 162                         output = "suspended";
 163                         break;
 164                 case RPM_SUSPENDING:
 165                         output = "suspending";
 166                         break;
 167                 case RPM_RESUMING:
 168                         output = "resuming";
 169                         break;
 170                 case RPM_ACTIVE:
 171                         output = "active";
 172                         break;
 173                 default:
 174                         return -EIO;
 175                 }
 176         }
 177         return sysfs_emit(buf, "%s\n", output);
 178 }
 179
 180 static DEVICE_ATTR_RO(runtime_status);
 181
 182 static ssize_t autosuspend_delay_ms_show(struct device *dev,
 183                                          struct device_attribute *attr,
 184                                          char *buf)
 185 {
 186         if (!dev->power.use_autosuspend)
 187                 return -EIO;
 188
 189         return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay);
 190 }
 191
 192 static ssize_t autosuspend_delay_ms_store(struct device *dev,
 193                 struct device_attribute *attr, const char *buf, size_t n)
 194 {
 195         long delay;
 196
 197         if (!dev->power.use_autosuspend)
 198                 return -EIO;
 199
 200         if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
 201                 return -EINVAL;
 202
 203         device_lock(dev);
 204         pm_runtime_set_autosuspend_delay(dev, delay);
 205         device_unlock(dev);
 206         return n;
 207 }
 208
 209 static DEVICE_ATTR_RW(autosuspend_delay_ms);
 210
 211 static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
 212                                              struct device_attribute *attr,
 213                                              char *buf)
 214 {
 215         s32 value = dev_pm_qos_requested_resume_latency(dev);
 216
 217         if (value == 0)
 218                 return sysfs_emit(buf, "n/a\n");
 219         if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
 220                 value = 0;
 221
 222         return sysfs_emit(buf, "%d\n", value);
 223 }
 224
 225 static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
 226                                               struct device_attribute *attr,
 227                                               const char *buf, size_t n)
 228 {
 229         s32 value;
 230         int ret;
 231
 232         if (!kstrtos32(buf, 0, &value)) {
 233                 /*
 234                  * Prevent users from writing negative or "no constraint" values
 235                  * directly.
 236                  */
 237                 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
 238                         return -EINVAL;
 239
 240                 if (value == 0)
 241                         value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
 242         } else if (sysfs_streq(buf, "n/a")) {
 243                 value = 0;
 244         } else {
 245                 return -EINVAL;
 246         }
 247
 248         ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
 249                                         value);
 250         return ret < 0 ? ret : n;
 251 }
 252
 253 static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
 254
 255 static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
 256                                                 struct device_attribute *attr,
 257                                                 char *buf)
 258 {
 259         s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
 260
 261         if (value < 0)
 262                 return sysfs_emit(buf, "%s\n", "auto");
 263         if (value == PM_QOS_LATENCY_ANY)
 264                 return sysfs_emit(buf, "%s\n", "any");
 265
 266         return sysfs_emit(buf, "%d\n", value);
 267 }
 268
 269 static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
 270                                                  struct device_attribute *attr,
 271                                                  const char *buf, size_t n)
 272 {
 273         s32 value;
 274         int ret;
 275
 276         if (kstrtos32(buf, 0, &value) == 0) {
 277                 /* Users can't write negative values directly */
 278                 if (value < 0)
 279                         return -EINVAL;
 280         } else {
 281                 if (sysfs_streq(buf, "auto"))
 282                         value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
 283                 else if (sysfs_streq(buf, "any"))
 284                         value = PM_QOS_LATENCY_ANY;
 285                 else
 286                         return -EINVAL;
 287         }
 288         ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
 289         return ret < 0 ? ret : n;
 290 }
 291
 292 static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
 293
 294 static ssize_t pm_qos_no_power_off_show(struct device *dev,
 295                                         struct device_attribute *attr,
 296                                         char *buf)
 297 {
 298         return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
 299                                           & PM_QOS_FLAG_NO_POWER_OFF));
 300 }
 301
 302 static ssize_t pm_qos_no_power_off_store(struct device *dev,
 303                                          struct device_attribute *attr,
 304                                          const char *buf, size_t n)
 305 {
 306         int ret;
 307
 308         if (kstrtoint(buf, 0, &ret))
 309                 return -EINVAL;
 310
 311         if (ret != 0 && ret != 1)
 312                 return -EINVAL;
 313
 314         ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
 315         return ret < 0 ? ret : n;
 316 }
 317
 318 static DEVICE_ATTR_RW(pm_qos_no_power_off);
 319
 320 #ifdef CONFIG_PM_SLEEP
 321 static const char _enabled[] = "enabled";
 322 static const char _disabled[] = "disabled";
 323
 324 static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
 325                            char *buf)
 326 {
 327         return sysfs_emit(buf, "%s\n", device_can_wakeup(dev)
 328                           ? (device_may_wakeup(dev) ? _enabled : _disabled)
 329                           : "");
 330 }
 331
 332 static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
 333                             const char *buf, size_t n)
 334 {
 335         if (!device_can_wakeup(dev))
 336                 return -EINVAL;
 337
 338         if (sysfs_streq(buf, _enabled))
 339                 device_set_wakeup_enable(dev, 1);
 340         else if (sysfs_streq(buf, _disabled))
 341                 device_set_wakeup_enable(dev, 0);
 342         else
 343                 return -EINVAL;
 344         return n;
 345 }
 346
 347 static DEVICE_ATTR_RW(wakeup);
 348
 349 static ssize_t wakeup_count_show(struct device *dev,
 350                                  struct device_attribute *attr, char *buf)
 351 {
 352         unsigned long count;
 353         bool enabled = false;
 354
 355         spin_lock_irq(&dev->power.lock);
 356         if (dev->power.wakeup) {
 357                 count = dev->power.wakeup->wakeup_count;
 358                 enabled = true;
 359         }
 360         spin_unlock_irq(&dev->power.lock);
 361
 362         if (!enabled)
 363                 return sysfs_emit(buf, "\n");
 364         return sysfs_emit(buf, "%lu\n", count);
 365 }
 366
 367 static DEVICE_ATTR_RO(wakeup_count);
 368
 369 static ssize_t wakeup_active_count_show(struct device *dev,
 370                                         struct device_attribute *attr,
 371                                         char *buf)
 372 {
 373         unsigned long count;
 374         bool enabled = false;
 375
 376         spin_lock_irq(&dev->power.lock);
 377         if (dev->power.wakeup) {
 378                 count = dev->power.wakeup->active_count;
 379                 enabled = true;
 380         }
 381         spin_unlock_irq(&dev->power.lock);
 382
 383         if (!enabled)
 384                 return sysfs_emit(buf, "\n");
 385         return sysfs_emit(buf, "%lu\n", count);
 386 }
 387
 388 static DEVICE_ATTR_RO(wakeup_active_count);
 389
 390 static ssize_t wakeup_abort_count_show(struct device *dev,
 391                                        struct device_attribute *attr,
 392                                        char *buf)
 393 {
 394         unsigned long count;
 395         bool enabled = false;
 396
 397         spin_lock_irq(&dev->power.lock);
 398         if (dev->power.wakeup) {
 399                 count = dev->power.wakeup->wakeup_count;
 400                 enabled = true;
 401         }
 402         spin_unlock_irq(&dev->power.lock);
 403
 404         if (!enabled)
 405                 return sysfs_emit(buf, "\n");
 406         return sysfs_emit(buf, "%lu\n", count);
 407 }
 408
 409 static DEVICE_ATTR_RO(wakeup_abort_count);
 410
 411 static ssize_t wakeup_expire_count_show(struct device *dev,
 412                                         struct device_attribute *attr,
 413                                         char *buf)
 414 {
 415         unsigned long count;
 416         bool enabled = false;
 417
 418         spin_lock_irq(&dev->power.lock);
 419         if (dev->power.wakeup) {
 420                 count = dev->power.wakeup->expire_count;
 421                 enabled = true;
 422         }
 423         spin_unlock_irq(&dev->power.lock);
 424
 425         if (!enabled)
 426                 return sysfs_emit(buf, "\n");
 427         return sysfs_emit(buf, "%lu\n", count);
 428 }
 429
 430 static DEVICE_ATTR_RO(wakeup_expire_count);
 431
 432 static ssize_t wakeup_active_show(struct device *dev,
 433                                   struct device_attribute *attr, char *buf)
 434 {
 435         unsigned int active;
 436         bool enabled = false;
 437
 438         spin_lock_irq(&dev->power.lock);
 439         if (dev->power.wakeup) {
 440                 active = dev->power.wakeup->active;
 441                 enabled = true;
 442         }
 443         spin_unlock_irq(&dev->power.lock);
 444
 445         if (!enabled)
 446                 return sysfs_emit(buf, "\n");
 447         return sysfs_emit(buf, "%u\n", active);
 448 }
 449
 450 static DEVICE_ATTR_RO(wakeup_active);
 451
 452 static ssize_t wakeup_total_time_ms_show(struct device *dev,
 453                                          struct device_attribute *attr,
 454                                          char *buf)
 455 {
 456         s64 msec;
 457         bool enabled = false;
 458
 459         spin_lock_irq(&dev->power.lock);
 460         if (dev->power.wakeup) {
 461                 msec = ktime_to_ms(dev->power.wakeup->total_time);
 462                 enabled = true;
 463         }
 464         spin_unlock_irq(&dev->power.lock);
 465
 466         if (!enabled)
 467                 return sysfs_emit(buf, "\n");
 468         return sysfs_emit(buf, "%lld\n", msec);
 469 }
 470
 471 static DEVICE_ATTR_RO(wakeup_total_time_ms);
 472
 473 static ssize_t wakeup_max_time_ms_show(struct device *dev,
 474                                        struct device_attribute *attr, char *buf)
 475 {
 476         s64 msec;
 477         bool enabled = false;
 478
 479         spin_lock_irq(&dev->power.lock);
 480         if (dev->power.wakeup) {
 481                 msec = ktime_to_ms(dev->power.wakeup->max_time);
 482                 enabled = true;
 483         }
 484         spin_unlock_irq(&dev->power.lock);
 485
 486         if (!enabled)
 487                 return sysfs_emit(buf, "\n");
 488         return sysfs_emit(buf, "%lld\n", msec);
 489 }
 490
 491 static DEVICE_ATTR_RO(wakeup_max_time_ms);
 492
 493 static ssize_t wakeup_last_time_ms_show(struct device *dev,
 494                                         struct device_attribute *attr,
 495                                         char *buf)
 496 {
 497         s64 msec;
 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
 507         if (!enabled)
 508                 return sysfs_emit(buf, "\n");
 509         return sysfs_emit(buf, "%lld\n", msec);
 510 }
 511
 512 static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
 513                                                 kgid_t kgid)
 514 {
 515         if (dev->power.wakeup && dev->power.wakeup->dev)
 516                 return device_change_owner(dev->power.wakeup->dev, kuid, kgid);
 517         return 0;
 518 }
 519
 520 static DEVICE_ATTR_RO(wakeup_last_time_ms);
 521
 522 #ifdef CONFIG_PM_AUTOSLEEP
 523 static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
 524                                                  struct device_attribute *attr,
 525                                                  char *buf)
 526 {
 527         s64 msec;
 528         bool enabled = false;
 529
 530         spin_lock_irq(&dev->power.lock);
 531         if (dev->power.wakeup) {
 532                 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
 533                 enabled = true;
 534         }
 535         spin_unlock_irq(&dev->power.lock);
 536
 537         if (!enabled)
 538                 return sysfs_emit(buf, "\n");
 539         return sysfs_emit(buf, "%lld\n", msec);
 540 }
 541
 542 static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
 543 #endif /* CONFIG_PM_AUTOSLEEP */
 544 #else /* CONFIG_PM_SLEEP */
 545 static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
 546                                                 kgid_t kgid)
 547 {
 548         return 0;
 549 }
 550 #endif
 551
 552 #ifdef CONFIG_PM_ADVANCED_DEBUG
 553 static ssize_t runtime_usage_show(struct device *dev,
 554                                   struct device_attribute *attr, char *buf)
 555 {
 556         return sysfs_emit(buf, "%d\n", atomic_read(&dev->power.usage_count));
 557 }
 558 static DEVICE_ATTR_RO(runtime_usage);
 559
 560 static ssize_t runtime_active_kids_show(struct device *dev,
 561                                         struct device_attribute *attr,
 562                                         char *buf)
 563 {
 564         return sysfs_emit(buf, "%d\n", dev->power.ignore_children ?
 565                           0 : atomic_read(&dev->power.child_count));
 566 }
 567 static DEVICE_ATTR_RO(runtime_active_kids);
 568
 569 static ssize_t runtime_enabled_show(struct device *dev,
 570                                     struct device_attribute *attr, char *buf)
 571 {
 572         const char *output;
 573
 574         if (dev->power.disable_depth && !dev->power.runtime_auto)
 575                 output = "disabled & forbidden";
 576         else if (dev->power.disable_depth)
 577                 output = "disabled";
 578         else if (!dev->power.runtime_auto)
 579                 output = "forbidden";
 580         else
 581                 output = "enabled";
 582
 583         return sysfs_emit(buf, "%s\n", output);
 584 }
 585 static DEVICE_ATTR_RO(runtime_enabled);
 586
 587 #ifdef CONFIG_PM_SLEEP
 588 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
 589                           char *buf)
 590 {
 591         return sysfs_emit(buf, "%s\n",
 592                           device_async_suspend_enabled(dev) ?
 593                           _enabled : _disabled);
 594 }
 595
 596 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
 597                            const char *buf, size_t n)
 598 {
 599         if (sysfs_streq(buf, _enabled))
 600                 device_enable_async_suspend(dev);
 601         else if (sysfs_streq(buf, _disabled))
 602                 device_disable_async_suspend(dev);
 603         else
 604                 return -EINVAL;
 605         return n;
 606 }
 607
 608 static DEVICE_ATTR_RW(async);
 609
 610 #endif /* CONFIG_PM_SLEEP */
 611 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 612
 613 static struct attribute *power_attrs[] = {
 614 #ifdef CONFIG_PM_ADVANCED_DEBUG
 615 #ifdef CONFIG_PM_SLEEP
 616         &dev_attr_async.attr,
 617 #endif
 618         &dev_attr_runtime_status.attr,
 619         &dev_attr_runtime_usage.attr,
 620         &dev_attr_runtime_active_kids.attr,
 621         &dev_attr_runtime_enabled.attr,
 622 #endif /* CONFIG_PM_ADVANCED_DEBUG */
 623         NULL,
 624 };
 625 static const struct attribute_group pm_attr_group = {
 626         .name   = power_group_name,
 627         .attrs  = power_attrs,
 628 };
 629
 630 static struct attribute *wakeup_attrs[] = {
 631 #ifdef CONFIG_PM_SLEEP
 632         &dev_attr_wakeup.attr,
 633         &dev_attr_wakeup_count.attr,
 634         &dev_attr_wakeup_active_count.attr,
 635         &dev_attr_wakeup_abort_count.attr,
 636         &dev_attr_wakeup_expire_count.attr,
 637         &dev_attr_wakeup_active.attr,
 638         &dev_attr_wakeup_total_time_ms.attr,
 639         &dev_attr_wakeup_max_time_ms.attr,
 640         &dev_attr_wakeup_last_time_ms.attr,
 641 #ifdef CONFIG_PM_AUTOSLEEP
 642         &dev_attr_wakeup_prevent_sleep_time_ms.attr,
 643 #endif
 644 #endif
 645         NULL,
 646 };
 647 static const struct attribute_group pm_wakeup_attr_group = {
 648         .name   = power_group_name,
 649         .attrs  = wakeup_attrs,
 650 };
 651
 652 static struct attribute *runtime_attrs[] = {
 653 #ifndef CONFIG_PM_ADVANCED_DEBUG
 654         &dev_attr_runtime_status.attr,
 655 #endif
 656         &dev_attr_control.attr,
 657         &dev_attr_runtime_suspended_time.attr,
 658         &dev_attr_runtime_active_time.attr,
 659         &dev_attr_autosuspend_delay_ms.attr,
 660         NULL,
 661 };
 662 static const struct attribute_group pm_runtime_attr_group = {
 663         .name   = power_group_name,
 664         .attrs  = runtime_attrs,
 665 };
 666
 667 static struct attribute *pm_qos_resume_latency_attrs[] = {
 668         &dev_attr_pm_qos_resume_latency_us.attr,
 669         NULL,
 670 };
 671 static const struct attribute_group pm_qos_resume_latency_attr_group = {
 672         .name   = power_group_name,
 673         .attrs  = pm_qos_resume_latency_attrs,
 674 };
 675
 676 static struct attribute *pm_qos_latency_tolerance_attrs[] = {
 677         &dev_attr_pm_qos_latency_tolerance_us.attr,
 678         NULL,
 679 };
 680 static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
 681         .name   = power_group_name,
 682         .attrs  = pm_qos_latency_tolerance_attrs,
 683 };
 684
 685 static struct attribute *pm_qos_flags_attrs[] = {
 686         &dev_attr_pm_qos_no_power_off.attr,
 687         NULL,
 688 };
 689 static const struct attribute_group pm_qos_flags_attr_group = {
 690         .name   = power_group_name,
 691         .attrs  = pm_qos_flags_attrs,
 692 };
 693
 694 int dpm_sysfs_add(struct device *dev)
 695 {
 696         int rc;
 697
 698         /* No need to create PM sysfs if explicitly disabled. */
 699         if (device_pm_not_required(dev))
 700                 return 0;
 701
 702         rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
 703         if (rc)
 704                 return rc;
 705
 706         if (!pm_runtime_has_no_callbacks(dev)) {
 707                 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
 708                 if (rc)
 709                         goto err_out;
 710         }
 711         if (device_can_wakeup(dev)) {
 712                 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 713                 if (rc)
 714                         goto err_runtime;
 715         }
 716         if (dev->power.set_latency_tolerance) {
 717                 rc = sysfs_merge_group(&dev->kobj,
 718                                        &pm_qos_latency_tolerance_attr_group);
 719                 if (rc)
 720                         goto err_wakeup;
 721         }
 722         rc = pm_wakeup_source_sysfs_add(dev);
 723         if (rc)
 724                 goto err_latency;
 725         return 0;
 726
 727  err_latency:
 728         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 729  err_wakeup:
 730         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 731  err_runtime:
 732         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 733  err_out:
 734         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 735         return rc;
 736 }
 737
 738 int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
 739 {
 740         int rc;
 741
 742         if (device_pm_not_required(dev))
 743                 return 0;
 744
 745         rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid);
 746         if (rc)
 747                 return rc;
 748
 749         if (!pm_runtime_has_no_callbacks(dev)) {
 750                 rc = sysfs_group_change_owner(
 751                         &dev->kobj, &pm_runtime_attr_group, kuid, kgid);
 752                 if (rc)
 753                         return rc;
 754         }
 755
 756         if (device_can_wakeup(dev)) {
 757                 rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group,
 758                                               kuid, kgid);
 759                 if (rc)
 760                         return rc;
 761
 762                 rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid);
 763                 if (rc)
 764                         return rc;
 765         }
 766
 767         if (dev->power.set_latency_tolerance) {
 768                 rc = sysfs_group_change_owner(
 769                         &dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid,
 770                         kgid);
 771                 if (rc)
 772                         return rc;
 773         }
 774         return 0;
 775 }
 776
 777 int wakeup_sysfs_add(struct device *dev)
 778 {
 779         int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
 780
 781         if (!ret)
 782                 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
 783
 784         return ret;
 785 }
 786
 787 void wakeup_sysfs_remove(struct device *dev)
 788 {
 789         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 790         kobject_uevent(&dev->kobj, KOBJ_CHANGE);
 791 }
 792
 793 int pm_qos_sysfs_add_resume_latency(struct device *dev)
 794 {
 795         return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 796 }
 797
 798 void pm_qos_sysfs_remove_resume_latency(struct device *dev)
 799 {
 800         sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
 801 }
 802
 803 int pm_qos_sysfs_add_flags(struct device *dev)
 804 {
 805         return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
 806 }
 807
 808 void pm_qos_sysfs_remove_flags(struct device *dev)
 809 {
 810         sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
 811 }
 812
 813 int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
 814 {
 815         return sysfs_merge_group(&dev->kobj,
 816                                  &pm_qos_latency_tolerance_attr_group);
 817 }
 818
 819 void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
 820 {
 821         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 822 }
 823
 824 void rpm_sysfs_remove(struct device *dev)
 825 {
 826         sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
 827 }
 828
 829 void dpm_sysfs_remove(struct device *dev)
 830 {
 831         if (device_pm_not_required(dev))
 832                 return;
 833         sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
 834         dev_pm_qos_constraints_destroy(dev);
 835         rpm_sysfs_remove(dev);
 836         sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
 837         sysfs_remove_group(&dev->kobj, &pm_attr_group);
 838 }