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
95const char power_group_name[] = "power";
96EXPORT_SYMBOL_GPL(power_group_name);
97
98static const char ctrl_auto[] = "auto";
99static const char ctrl_on[] = "on";
100
101static 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
108static 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
122static DEVICE_ATTR_RW(control);
123
124static ssize_t runtime_active_time_show(struct device *dev,
125 struct device_attribute *attr, char *buf)
126{
127 int ret;
128 u64 tmp = pm_runtime_active_time(dev);
129 do_div(tmp, NSEC_PER_MSEC);
130 ret = sprintf(buf, "%llu\n", tmp);
131 return ret;
132}
133
134static DEVICE_ATTR_RO(runtime_active_time);
135
136static ssize_t runtime_suspended_time_show(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 int ret;
140 u64 tmp = pm_runtime_suspended_time(dev);
141 do_div(tmp, NSEC_PER_MSEC);
142 ret = sprintf(buf, "%llu\n", tmp);
143 return ret;
144}
145
146static DEVICE_ATTR_RO(runtime_suspended_time);
147
148static ssize_t runtime_status_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
150{
151 const char *p;
152
153 if (dev->power.runtime_error) {
154 p = "error\n";
155 } else if (dev->power.disable_depth) {
156 p = "unsupported\n";
157 } else {
158 switch (dev->power.runtime_status) {
159 case RPM_SUSPENDED:
160 p = "suspended\n";
161 break;
162 case RPM_SUSPENDING:
163 p = "suspending\n";
164 break;
165 case RPM_RESUMING:
166 p = "resuming\n";
167 break;
168 case RPM_ACTIVE:
169 p = "active\n";
170 break;
171 default:
172 return -EIO;
173 }
174 }
175 return sprintf(buf, p);
176}
177
178static DEVICE_ATTR_RO(runtime_status);
179
180static ssize_t autosuspend_delay_ms_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 if (!dev->power.use_autosuspend)
184 return -EIO;
185 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
186}
187
188static ssize_t autosuspend_delay_ms_store(struct device *dev,
189 struct device_attribute *attr, const char *buf, size_t n)
190{
191 long delay;
192
193 if (!dev->power.use_autosuspend)
194 return -EIO;
195
196 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
197 return -EINVAL;
198
199 device_lock(dev);
200 pm_runtime_set_autosuspend_delay(dev, delay);
201 device_unlock(dev);
202 return n;
203}
204
205static DEVICE_ATTR_RW(autosuspend_delay_ms);
206
207static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
208 struct device_attribute *attr,
209 char *buf)
210{
211 s32 value = dev_pm_qos_requested_resume_latency(dev);
212
213 if (value == 0)
214 return sprintf(buf, "n/a\n");
215 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
216 value = 0;
217
218 return sprintf(buf, "%d\n", value);
219}
220
221static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
222 struct device_attribute *attr,
223 const char *buf, size_t n)
224{
225 s32 value;
226 int ret;
227
228 if (!kstrtos32(buf, 0, &value)) {
229 /*
230 * Prevent users from writing negative or "no constraint" values
231 * directly.
232 */
233 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
234 return -EINVAL;
235
236 if (value == 0)
237 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
238 } else if (sysfs_streq(buf, "n/a")) {
239 value = 0;
240 } else {
241 return -EINVAL;
242 }
243
244 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
245 value);
246 return ret < 0 ? ret : n;
247}
248
249static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
250
251static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
252 struct device_attribute *attr,
253 char *buf)
254{
255 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
256
257 if (value < 0)
258 return sprintf(buf, "auto\n");
259 if (value == PM_QOS_LATENCY_ANY)
260 return sprintf(buf, "any\n");
261
262 return sprintf(buf, "%d\n", value);
263}
264
265static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
266 struct device_attribute *attr,
267 const char *buf, size_t n)
268{
269 s32 value;
270 int ret;
271
272 if (kstrtos32(buf, 0, &value) == 0) {
273 /* Users can't write negative values directly */
274 if (value < 0)
275 return -EINVAL;
276 } else {
277 if (sysfs_streq(buf, "auto"))
278 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
279 else if (sysfs_streq(buf, "any"))
280 value = PM_QOS_LATENCY_ANY;
281 else
282 return -EINVAL;
283 }
284 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
285 return ret < 0 ? ret : n;
286}
287
288static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
289
290static ssize_t pm_qos_no_power_off_show(struct device *dev,
291 struct device_attribute *attr,
292 char *buf)
293{
294 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
295 & PM_QOS_FLAG_NO_POWER_OFF));
296}
297
298static ssize_t pm_qos_no_power_off_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t n)
301{
302 int ret;
303
304 if (kstrtoint(buf, 0, &ret))
305 return -EINVAL;
306
307 if (ret != 0 && ret != 1)
308 return -EINVAL;
309
310 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
311 return ret < 0 ? ret : n;
312}
313
314static DEVICE_ATTR_RW(pm_qos_no_power_off);
315
316#ifdef CONFIG_PM_SLEEP
317static const char _enabled[] = "enabled";
318static const char _disabled[] = "disabled";
319
320static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
321 char *buf)
322{
323 return sprintf(buf, "%s\n", device_can_wakeup(dev)
324 ? (device_may_wakeup(dev) ? _enabled : _disabled)
325 : "");
326}
327
328static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
329 const char *buf, size_t n)
330{
331 if (!device_can_wakeup(dev))
332 return -EINVAL;
333
334 if (sysfs_streq(buf, _enabled))
335 device_set_wakeup_enable(dev, 1);
336 else if (sysfs_streq(buf, _disabled))
337 device_set_wakeup_enable(dev, 0);
338 else
339 return -EINVAL;
340 return n;
341}
342
343static DEVICE_ATTR_RW(wakeup);
344
345static ssize_t wakeup_count_show(struct device *dev,
346 struct device_attribute *attr, char *buf)
347{
348 unsigned long count = 0;
349 bool enabled = false;
350
351 spin_lock_irq(&dev->power.lock);
352 if (dev->power.wakeup) {
353 count = dev->power.wakeup->wakeup_count;
354 enabled = true;
355 }
356 spin_unlock_irq(&dev->power.lock);
357 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
358}
359
360static DEVICE_ATTR_RO(wakeup_count);
361
362static ssize_t wakeup_active_count_show(struct device *dev,
363 struct device_attribute *attr,
364 char *buf)
365{
366 unsigned long count = 0;
367 bool enabled = false;
368
369 spin_lock_irq(&dev->power.lock);
370 if (dev->power.wakeup) {
371 count = dev->power.wakeup->active_count;
372 enabled = true;
373 }
374 spin_unlock_irq(&dev->power.lock);
375 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
376}
377
378static DEVICE_ATTR_RO(wakeup_active_count);
379
380static ssize_t wakeup_abort_count_show(struct device *dev,
381 struct device_attribute *attr,
382 char *buf)
383{
384 unsigned long count = 0;
385 bool enabled = false;
386
387 spin_lock_irq(&dev->power.lock);
388 if (dev->power.wakeup) {
389 count = dev->power.wakeup->wakeup_count;
390 enabled = true;
391 }
392 spin_unlock_irq(&dev->power.lock);
393 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
394}
395
396static DEVICE_ATTR_RO(wakeup_abort_count);
397
398static ssize_t wakeup_expire_count_show(struct device *dev,
399 struct device_attribute *attr,
400 char *buf)
401{
402 unsigned long count = 0;
403 bool enabled = false;
404
405 spin_lock_irq(&dev->power.lock);
406 if (dev->power.wakeup) {
407 count = dev->power.wakeup->expire_count;
408 enabled = true;
409 }
410 spin_unlock_irq(&dev->power.lock);
411 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
412}
413
414static DEVICE_ATTR_RO(wakeup_expire_count);
415
416static ssize_t wakeup_active_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 unsigned int active = 0;
420 bool enabled = false;
421
422 spin_lock_irq(&dev->power.lock);
423 if (dev->power.wakeup) {
424 active = dev->power.wakeup->active;
425 enabled = true;
426 }
427 spin_unlock_irq(&dev->power.lock);
428 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
429}
430
431static DEVICE_ATTR_RO(wakeup_active);
432
433static ssize_t wakeup_total_time_ms_show(struct device *dev,
434 struct device_attribute *attr,
435 char *buf)
436{
437 s64 msec = 0;
438 bool enabled = false;
439
440 spin_lock_irq(&dev->power.lock);
441 if (dev->power.wakeup) {
442 msec = ktime_to_ms(dev->power.wakeup->total_time);
443 enabled = true;
444 }
445 spin_unlock_irq(&dev->power.lock);
446 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
447}
448
449static DEVICE_ATTR_RO(wakeup_total_time_ms);
450
451static ssize_t wakeup_max_time_ms_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
453{
454 s64 msec = 0;
455 bool enabled = false;
456
457 spin_lock_irq(&dev->power.lock);
458 if (dev->power.wakeup) {
459 msec = ktime_to_ms(dev->power.wakeup->max_time);
460 enabled = true;
461 }
462 spin_unlock_irq(&dev->power.lock);
463 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
464}
465
466static DEVICE_ATTR_RO(wakeup_max_time_ms);
467
468static ssize_t wakeup_last_time_ms_show(struct device *dev,
469 struct device_attribute *attr,
470 char *buf)
471{
472 s64 msec = 0;
473 bool enabled = false;
474
475 spin_lock_irq(&dev->power.lock);
476 if (dev->power.wakeup) {
477 msec = ktime_to_ms(dev->power.wakeup->last_time);
478 enabled = true;
479 }
480 spin_unlock_irq(&dev->power.lock);
481 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
482}
483
484static DEVICE_ATTR_RO(wakeup_last_time_ms);
485
486#ifdef CONFIG_PM_AUTOSLEEP
487static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
488 struct device_attribute *attr,
489 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->prevent_sleep_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
503static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
504#endif /* CONFIG_PM_AUTOSLEEP */
505#endif /* CONFIG_PM_SLEEP */
506
507#ifdef CONFIG_PM_ADVANCED_DEBUG
508static ssize_t runtime_usage_show(struct device *dev,
509 struct device_attribute *attr, char *buf)
510{
511 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
512}
513static DEVICE_ATTR_RO(runtime_usage);
514
515static ssize_t runtime_active_kids_show(struct device *dev,
516 struct device_attribute *attr,
517 char *buf)
518{
519 return sprintf(buf, "%d\n", dev->power.ignore_children ?
520 0 : atomic_read(&dev->power.child_count));
521}
522static DEVICE_ATTR_RO(runtime_active_kids);
523
524static ssize_t runtime_enabled_show(struct device *dev,
525 struct device_attribute *attr, char *buf)
526{
527 if (dev->power.disable_depth && (dev->power.runtime_auto == false))
528 return sprintf(buf, "disabled & forbidden\n");
529 if (dev->power.disable_depth)
530 return sprintf(buf, "disabled\n");
531 if (dev->power.runtime_auto == false)
532 return sprintf(buf, "forbidden\n");
533 return sprintf(buf, "enabled\n");
534}
535static DEVICE_ATTR_RO(runtime_enabled);
536
537#ifdef CONFIG_PM_SLEEP
538static ssize_t async_show(struct device *dev, struct device_attribute *attr,
539 char *buf)
540{
541 return sprintf(buf, "%s\n",
542 device_async_suspend_enabled(dev) ?
543 _enabled : _disabled);
544}
545
546static ssize_t async_store(struct device *dev, struct device_attribute *attr,
547 const char *buf, size_t n)
548{
549 if (sysfs_streq(buf, _enabled))
550 device_enable_async_suspend(dev);
551 else if (sysfs_streq(buf, _disabled))
552 device_disable_async_suspend(dev);
553 else
554 return -EINVAL;
555 return n;
556}
557
558static DEVICE_ATTR_RW(async);
559
560#endif /* CONFIG_PM_SLEEP */
561#endif /* CONFIG_PM_ADVANCED_DEBUG */
562
563static struct attribute *power_attrs[] = {
564#ifdef CONFIG_PM_ADVANCED_DEBUG
565#ifdef CONFIG_PM_SLEEP
566 &dev_attr_async.attr,
567#endif
568 &dev_attr_runtime_status.attr,
569 &dev_attr_runtime_usage.attr,
570 &dev_attr_runtime_active_kids.attr,
571 &dev_attr_runtime_enabled.attr,
572#endif /* CONFIG_PM_ADVANCED_DEBUG */
573 NULL,
574};
575static const struct attribute_group pm_attr_group = {
576 .name = power_group_name,
577 .attrs = power_attrs,
578};
579
580static struct attribute *wakeup_attrs[] = {
581#ifdef CONFIG_PM_SLEEP
582 &dev_attr_wakeup.attr,
583 &dev_attr_wakeup_count.attr,
584 &dev_attr_wakeup_active_count.attr,
585 &dev_attr_wakeup_abort_count.attr,
586 &dev_attr_wakeup_expire_count.attr,
587 &dev_attr_wakeup_active.attr,
588 &dev_attr_wakeup_total_time_ms.attr,
589 &dev_attr_wakeup_max_time_ms.attr,
590 &dev_attr_wakeup_last_time_ms.attr,
591#ifdef CONFIG_PM_AUTOSLEEP
592 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
593#endif
594#endif
595 NULL,
596};
597static const struct attribute_group pm_wakeup_attr_group = {
598 .name = power_group_name,
599 .attrs = wakeup_attrs,
600};
601
602static struct attribute *runtime_attrs[] = {
603#ifndef CONFIG_PM_ADVANCED_DEBUG
604 &dev_attr_runtime_status.attr,
605#endif
606 &dev_attr_control.attr,
607 &dev_attr_runtime_suspended_time.attr,
608 &dev_attr_runtime_active_time.attr,
609 &dev_attr_autosuspend_delay_ms.attr,
610 NULL,
611};
612static const struct attribute_group pm_runtime_attr_group = {
613 .name = power_group_name,
614 .attrs = runtime_attrs,
615};
616
617static struct attribute *pm_qos_resume_latency_attrs[] = {
618 &dev_attr_pm_qos_resume_latency_us.attr,
619 NULL,
620};
621static const struct attribute_group pm_qos_resume_latency_attr_group = {
622 .name = power_group_name,
623 .attrs = pm_qos_resume_latency_attrs,
624};
625
626static struct attribute *pm_qos_latency_tolerance_attrs[] = {
627 &dev_attr_pm_qos_latency_tolerance_us.attr,
628 NULL,
629};
630static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
631 .name = power_group_name,
632 .attrs = pm_qos_latency_tolerance_attrs,
633};
634
635static struct attribute *pm_qos_flags_attrs[] = {
636 &dev_attr_pm_qos_no_power_off.attr,
637 NULL,
638};
639static const struct attribute_group pm_qos_flags_attr_group = {
640 .name = power_group_name,
641 .attrs = pm_qos_flags_attrs,
642};
643
644int dpm_sysfs_add(struct device *dev)
645{
646 int rc;
647
648 /* No need to create PM sysfs if explicitly disabled. */
649 if (device_pm_not_required(dev))
650 return 0;
651
652 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
653 if (rc)
654 return rc;
655
656 if (pm_runtime_callbacks_present(dev)) {
657 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
658 if (rc)
659 goto err_out;
660 }
661 if (device_can_wakeup(dev)) {
662 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
663 if (rc)
664 goto err_runtime;
665 }
666 if (dev->power.set_latency_tolerance) {
667 rc = sysfs_merge_group(&dev->kobj,
668 &pm_qos_latency_tolerance_attr_group);
669 if (rc)
670 goto err_wakeup;
671 }
672 return 0;
673
674 err_wakeup:
675 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
676 err_runtime:
677 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
678 err_out:
679 sysfs_remove_group(&dev->kobj, &pm_attr_group);
680 return rc;
681}
682
683int wakeup_sysfs_add(struct device *dev)
684{
685 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
686}
687
688void wakeup_sysfs_remove(struct device *dev)
689{
690 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
691}
692
693int pm_qos_sysfs_add_resume_latency(struct device *dev)
694{
695 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
696}
697
698void pm_qos_sysfs_remove_resume_latency(struct device *dev)
699{
700 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
701}
702
703int pm_qos_sysfs_add_flags(struct device *dev)
704{
705 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
706}
707
708void pm_qos_sysfs_remove_flags(struct device *dev)
709{
710 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
711}
712
713int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
714{
715 return sysfs_merge_group(&dev->kobj,
716 &pm_qos_latency_tolerance_attr_group);
717}
718
719void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
720{
721 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
722}
723
724void rpm_sysfs_remove(struct device *dev)
725{
726 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
727}
728
729void dpm_sysfs_remove(struct device *dev)
730{
731 if (device_pm_not_required(dev))
732 return;
733 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
734 dev_pm_qos_constraints_destroy(dev);
735 rpm_sysfs_remove(dev);
736 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
737 sysfs_remove_group(&dev->kobj, &pm_attr_group);
738}
739