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Merge tag 'acpi-fix-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[linux.git] / 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 }
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