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
 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 inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
485						kgid_t kgid)
486{
487	if (dev->power.wakeup && dev->power.wakeup->dev)
488		return device_change_owner(dev->power.wakeup->dev, kuid, kgid);
489	return 0;
490}
491
492static DEVICE_ATTR_RO(wakeup_last_time_ms);
493
494#ifdef CONFIG_PM_AUTOSLEEP
495static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
496						 struct device_attribute *attr,
497						 char *buf)
498{
499	s64 msec = 0;
500	bool enabled = false;
501
502	spin_lock_irq(&dev->power.lock);
503	if (dev->power.wakeup) {
504		msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
505		enabled = true;
506	}
507	spin_unlock_irq(&dev->power.lock);
508	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
509}
510
511static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
512#endif /* CONFIG_PM_AUTOSLEEP */
513#else /* CONFIG_PM_SLEEP */
514static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
515						kgid_t kgid)
516{
517	return 0;
518}
519#endif
520
521#ifdef CONFIG_PM_ADVANCED_DEBUG
522static ssize_t runtime_usage_show(struct device *dev,
523				  struct device_attribute *attr, char *buf)
524{
525	return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
526}
527static DEVICE_ATTR_RO(runtime_usage);
528
529static ssize_t runtime_active_kids_show(struct device *dev,
530					struct device_attribute *attr,
531					char *buf)
532{
533	return sprintf(buf, "%d\n", dev->power.ignore_children ?
534		0 : atomic_read(&dev->power.child_count));
535}
536static DEVICE_ATTR_RO(runtime_active_kids);
537
538static ssize_t runtime_enabled_show(struct device *dev,
539				    struct device_attribute *attr, char *buf)
540{
541	if (dev->power.disable_depth && (dev->power.runtime_auto == false))
542		return sprintf(buf, "disabled & forbidden\n");
543	if (dev->power.disable_depth)
544		return sprintf(buf, "disabled\n");
545	if (dev->power.runtime_auto == false)
546		return sprintf(buf, "forbidden\n");
547	return sprintf(buf, "enabled\n");
548}
549static DEVICE_ATTR_RO(runtime_enabled);
550
551#ifdef CONFIG_PM_SLEEP
552static ssize_t async_show(struct device *dev, struct device_attribute *attr,
553			  char *buf)
554{
555	return sprintf(buf, "%s\n",
556			device_async_suspend_enabled(dev) ?
557				_enabled : _disabled);
558}
559
560static ssize_t async_store(struct device *dev, struct device_attribute *attr,
561			   const char *buf, size_t n)
562{
563	if (sysfs_streq(buf, _enabled))
564		device_enable_async_suspend(dev);
565	else if (sysfs_streq(buf, _disabled))
566		device_disable_async_suspend(dev);
567	else
568		return -EINVAL;
569	return n;
570}
571
572static DEVICE_ATTR_RW(async);
573
574#endif /* CONFIG_PM_SLEEP */
575#endif /* CONFIG_PM_ADVANCED_DEBUG */
576
577static struct attribute *power_attrs[] = {
578#ifdef CONFIG_PM_ADVANCED_DEBUG
579#ifdef CONFIG_PM_SLEEP
580	&dev_attr_async.attr,
581#endif
582	&dev_attr_runtime_status.attr,
583	&dev_attr_runtime_usage.attr,
584	&dev_attr_runtime_active_kids.attr,
585	&dev_attr_runtime_enabled.attr,
586#endif /* CONFIG_PM_ADVANCED_DEBUG */
587	NULL,
588};
589static const struct attribute_group pm_attr_group = {
590	.name	= power_group_name,
591	.attrs	= power_attrs,
592};
593
594static struct attribute *wakeup_attrs[] = {
595#ifdef CONFIG_PM_SLEEP
596	&dev_attr_wakeup.attr,
597	&dev_attr_wakeup_count.attr,
598	&dev_attr_wakeup_active_count.attr,
599	&dev_attr_wakeup_abort_count.attr,
600	&dev_attr_wakeup_expire_count.attr,
601	&dev_attr_wakeup_active.attr,
602	&dev_attr_wakeup_total_time_ms.attr,
603	&dev_attr_wakeup_max_time_ms.attr,
604	&dev_attr_wakeup_last_time_ms.attr,
605#ifdef CONFIG_PM_AUTOSLEEP
606	&dev_attr_wakeup_prevent_sleep_time_ms.attr,
607#endif
608#endif
609	NULL,
610};
611static const struct attribute_group pm_wakeup_attr_group = {
612	.name	= power_group_name,
613	.attrs	= wakeup_attrs,
614};
615
616static struct attribute *runtime_attrs[] = {
617#ifndef CONFIG_PM_ADVANCED_DEBUG
618	&dev_attr_runtime_status.attr,
619#endif
620	&dev_attr_control.attr,
621	&dev_attr_runtime_suspended_time.attr,
622	&dev_attr_runtime_active_time.attr,
623	&dev_attr_autosuspend_delay_ms.attr,
624	NULL,
625};
626static const struct attribute_group pm_runtime_attr_group = {
627	.name	= power_group_name,
628	.attrs	= runtime_attrs,
629};
630
631static struct attribute *pm_qos_resume_latency_attrs[] = {
632	&dev_attr_pm_qos_resume_latency_us.attr,
633	NULL,
634};
635static const struct attribute_group pm_qos_resume_latency_attr_group = {
636	.name	= power_group_name,
637	.attrs	= pm_qos_resume_latency_attrs,
638};
639
640static struct attribute *pm_qos_latency_tolerance_attrs[] = {
641	&dev_attr_pm_qos_latency_tolerance_us.attr,
642	NULL,
643};
644static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
645	.name	= power_group_name,
646	.attrs	= pm_qos_latency_tolerance_attrs,
647};
648
649static struct attribute *pm_qos_flags_attrs[] = {
650	&dev_attr_pm_qos_no_power_off.attr,
651	NULL,
652};
653static const struct attribute_group pm_qos_flags_attr_group = {
654	.name	= power_group_name,
655	.attrs	= pm_qos_flags_attrs,
656};
657
658int dpm_sysfs_add(struct device *dev)
659{
660	int rc;
661
662	/* No need to create PM sysfs if explicitly disabled. */
663	if (device_pm_not_required(dev))
664		return 0;
665
666	rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
667	if (rc)
668		return rc;
669
670	if (!pm_runtime_has_no_callbacks(dev)) {
671		rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
672		if (rc)
673			goto err_out;
674	}
675	if (device_can_wakeup(dev)) {
676		rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
677		if (rc)
678			goto err_runtime;
679	}
680	if (dev->power.set_latency_tolerance) {
681		rc = sysfs_merge_group(&dev->kobj,
682				       &pm_qos_latency_tolerance_attr_group);
683		if (rc)
684			goto err_wakeup;
685	}
686	rc = pm_wakeup_source_sysfs_add(dev);
687	if (rc)
688		goto err_latency;
689	return 0;
690
691 err_latency:
692	sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
693 err_wakeup:
694	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
695 err_runtime:
696	sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
697 err_out:
698	sysfs_remove_group(&dev->kobj, &pm_attr_group);
699	return rc;
700}
701
702int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
703{
704	int rc;
705
706	if (device_pm_not_required(dev))
707		return 0;
708
709	rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid);
710	if (rc)
711		return rc;
712
713	if (!pm_runtime_has_no_callbacks(dev)) {
714		rc = sysfs_group_change_owner(
715			&dev->kobj, &pm_runtime_attr_group, kuid, kgid);
716		if (rc)
717			return rc;
718	}
719
720	if (device_can_wakeup(dev)) {
721		rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group,
722					      kuid, kgid);
723		if (rc)
724			return rc;
725
726		rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid);
727		if (rc)
728			return rc;
729	}
730
731	if (dev->power.set_latency_tolerance) {
732		rc = sysfs_group_change_owner(
733			&dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid,
734			kgid);
735		if (rc)
736			return rc;
737	}
738	return 0;
739}
740
741int wakeup_sysfs_add(struct device *dev)
742{
743	int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
744
745	if (!ret)
746		kobject_uevent(&dev->kobj, KOBJ_CHANGE);
747
748	return ret;
749}
750
751void wakeup_sysfs_remove(struct device *dev)
752{
753	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
754	kobject_uevent(&dev->kobj, KOBJ_CHANGE);
755}
756
757int pm_qos_sysfs_add_resume_latency(struct device *dev)
758{
759	return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
760}
761
762void pm_qos_sysfs_remove_resume_latency(struct device *dev)
763{
764	sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
765}
766
767int pm_qos_sysfs_add_flags(struct device *dev)
768{
769	return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
770}
771
772void pm_qos_sysfs_remove_flags(struct device *dev)
773{
774	sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
775}
776
777int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
778{
779	return sysfs_merge_group(&dev->kobj,
780				 &pm_qos_latency_tolerance_attr_group);
781}
782
783void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
784{
785	sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
786}
787
788void rpm_sysfs_remove(struct device *dev)
789{
790	sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
791}
792
793void dpm_sysfs_remove(struct device *dev)
794{
795	if (device_pm_not_required(dev))
796		return;
797	sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
798	dev_pm_qos_constraints_destroy(dev);
799	rpm_sysfs_remove(dev);
800	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
801	sysfs_remove_group(&dev->kobj, &pm_attr_group);
802}