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1// SPDX-License-Identifier: GPL-2.0
2/* sysfs entries for device PM */
3#include <linux/device.h>
4#include <linux/string.h>
5#include <linux/export.h>
6#include <linux/pm_qos.h>
7#include <linux/pm_runtime.h>
8#include <linux/pm_wakeup.h>
9#include <linux/atomic.h>
10#include <linux/jiffies.h>
11#include "power.h"
12
13/*
14 * control - Report/change current runtime PM setting of the device
15 *
16 * Runtime power management of a device can be blocked with the help of
17 * this attribute. All devices have one of the following two values for
18 * the power/control file:
19 *
20 * + "auto\n" to allow the device to be power managed at run time;
21 * + "on\n" to prevent the device from being power managed at run time;
22 *
23 * The default for all devices is "auto", which means that devices may be
24 * subject to automatic power management, depending on their drivers.
25 * Changing this attribute to "on" prevents the driver from power managing
26 * the device at run time. Doing that while the device is suspended causes
27 * it to be woken up.
28 *
29 * wakeup - Report/change current wakeup option for device
30 *
31 * Some devices support "wakeup" events, which are hardware signals
32 * used to activate devices from suspended or low power states. Such
33 * devices have one of three values for the sysfs power/wakeup file:
34 *
35 * + "enabled\n" to issue the events;
36 * + "disabled\n" not to do so; or
37 * + "\n" for temporary or permanent inability to issue wakeup.
38 *
39 * (For example, unconfigured USB devices can't issue wakeups.)
40 *
41 * Familiar examples of devices that can issue wakeup events include
42 * keyboards and mice (both PS2 and USB styles), power buttons, modems,
43 * "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
44 * will wake the entire system from a suspend state; others may just
45 * wake up the device (if the system as a whole is already active).
46 * Some wakeup events use normal IRQ lines; other use special out
47 * of band signaling.
48 *
49 * It is the responsibility of device drivers to enable (or disable)
50 * wakeup signaling as part of changing device power states, respecting
51 * the policy choices provided through the driver model.
52 *
53 * Devices may not be able to generate wakeup events from all power
54 * states. Also, the events may be ignored in some configurations;
55 * for example, they might need help from other devices that aren't
56 * active, or which may have wakeup disabled. Some drivers rely on
57 * wakeup events internally (unless they are disabled), keeping
58 * their hardware in low power modes whenever they're unused. This
59 * saves runtime power, without requiring system-wide sleep states.
60 *
61 * async - Report/change current async suspend setting for the device
62 *
63 * Asynchronous suspend and resume of the device during system-wide power
64 * state transitions can be enabled by writing "enabled" to this file.
65 * Analogously, if "disabled" is written to this file, the device will be
66 * suspended and resumed synchronously.
67 *
68 * All devices have one of the following two values for power/async:
69 *
70 * + "enabled\n" to permit the asynchronous suspend/resume of the device;
71 * + "disabled\n" to forbid it;
72 *
73 * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
74 * of a device unless it is certain that all of the PM dependencies of the
75 * device are known to the PM core. However, for some devices this
76 * attribute is set to "enabled" by bus type code or device drivers and in
77 * that cases it should be safe to leave the default value.
78 *
79 * autosuspend_delay_ms - Report/change a device's autosuspend_delay value
80 *
81 * Some drivers don't want to carry out a runtime suspend as soon as a
82 * device becomes idle; they want it always to remain idle for some period
83 * of time before suspending it. This period is the autosuspend_delay
84 * value (expressed in milliseconds) and it can be controlled by the user.
85 * If the value is negative then the device will never be runtime
86 * suspended.
87 *
88 * NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
89 * value are used only if the driver calls pm_runtime_use_autosuspend().
90 *
91 * wakeup_count - Report the number of wakeup events related to the device
92 */
93
94const char power_group_name[] = "power";
95EXPORT_SYMBOL_GPL(power_group_name);
96
97static const char ctrl_auto[] = "auto";
98static const char ctrl_on[] = "on";
99
100static ssize_t control_show(struct device *dev, struct device_attribute *attr,
101 char *buf)
102{
103 return sprintf(buf, "%s\n",
104 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
105}
106
107static ssize_t control_store(struct device * dev, struct device_attribute *attr,
108 const char * buf, size_t n)
109{
110 device_lock(dev);
111 if (sysfs_streq(buf, ctrl_auto))
112 pm_runtime_allow(dev);
113 else if (sysfs_streq(buf, ctrl_on))
114 pm_runtime_forbid(dev);
115 else
116 n = -EINVAL;
117 device_unlock(dev);
118 return n;
119}
120
121static DEVICE_ATTR_RW(control);
122
123static ssize_t runtime_active_time_show(struct device *dev,
124 struct device_attribute *attr, char *buf)
125{
126 int ret;
127 u64 tmp = pm_runtime_active_time(dev);
128 do_div(tmp, NSEC_PER_MSEC);
129 ret = sprintf(buf, "%llu\n", tmp);
130 return ret;
131}
132
133static DEVICE_ATTR_RO(runtime_active_time);
134
135static ssize_t runtime_suspended_time_show(struct device *dev,
136 struct device_attribute *attr, char *buf)
137{
138 int ret;
139 u64 tmp = pm_runtime_suspended_time(dev);
140 do_div(tmp, NSEC_PER_MSEC);
141 ret = sprintf(buf, "%llu\n", tmp);
142 return ret;
143}
144
145static DEVICE_ATTR_RO(runtime_suspended_time);
146
147static ssize_t runtime_status_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149{
150 const char *p;
151
152 if (dev->power.runtime_error) {
153 p = "error\n";
154 } else if (dev->power.disable_depth) {
155 p = "unsupported\n";
156 } else {
157 switch (dev->power.runtime_status) {
158 case RPM_SUSPENDED:
159 p = "suspended\n";
160 break;
161 case RPM_SUSPENDING:
162 p = "suspending\n";
163 break;
164 case RPM_RESUMING:
165 p = "resuming\n";
166 break;
167 case RPM_ACTIVE:
168 p = "active\n";
169 break;
170 default:
171 return -EIO;
172 }
173 }
174 return sprintf(buf, p);
175}
176
177static DEVICE_ATTR_RO(runtime_status);
178
179static ssize_t autosuspend_delay_ms_show(struct device *dev,
180 struct device_attribute *attr, char *buf)
181{
182 if (!dev->power.use_autosuspend)
183 return -EIO;
184 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
185}
186
187static ssize_t autosuspend_delay_ms_store(struct device *dev,
188 struct device_attribute *attr, const char *buf, size_t n)
189{
190 long delay;
191
192 if (!dev->power.use_autosuspend)
193 return -EIO;
194
195 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
196 return -EINVAL;
197
198 device_lock(dev);
199 pm_runtime_set_autosuspend_delay(dev, delay);
200 device_unlock(dev);
201 return n;
202}
203
204static DEVICE_ATTR_RW(autosuspend_delay_ms);
205
206static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
207 struct device_attribute *attr,
208 char *buf)
209{
210 s32 value = dev_pm_qos_requested_resume_latency(dev);
211
212 if (value == 0)
213 return sprintf(buf, "n/a\n");
214 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
215 value = 0;
216
217 return sprintf(buf, "%d\n", value);
218}
219
220static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
221 struct device_attribute *attr,
222 const char *buf, size_t n)
223{
224 s32 value;
225 int ret;
226
227 if (!kstrtos32(buf, 0, &value)) {
228 /*
229 * Prevent users from writing negative or "no constraint" values
230 * directly.
231 */
232 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
233 return -EINVAL;
234
235 if (value == 0)
236 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
237 } else if (sysfs_streq(buf, "n/a")) {
238 value = 0;
239 } else {
240 return -EINVAL;
241 }
242
243 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
244 value);
245 return ret < 0 ? ret : n;
246}
247
248static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
249
250static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253{
254 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
255
256 if (value < 0)
257 return sprintf(buf, "auto\n");
258 if (value == PM_QOS_LATENCY_ANY)
259 return sprintf(buf, "any\n");
260
261 return sprintf(buf, "%d\n", value);
262}
263
264static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
265 struct device_attribute *attr,
266 const char *buf, size_t n)
267{
268 s32 value;
269 int ret;
270
271 if (kstrtos32(buf, 0, &value) == 0) {
272 /* Users can't write negative values directly */
273 if (value < 0)
274 return -EINVAL;
275 } else {
276 if (sysfs_streq(buf, "auto"))
277 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
278 else if (sysfs_streq(buf, "any"))
279 value = PM_QOS_LATENCY_ANY;
280 else
281 return -EINVAL;
282 }
283 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
284 return ret < 0 ? ret : n;
285}
286
287static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
288
289static ssize_t pm_qos_no_power_off_show(struct device *dev,
290 struct device_attribute *attr,
291 char *buf)
292{
293 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
294 & PM_QOS_FLAG_NO_POWER_OFF));
295}
296
297static ssize_t pm_qos_no_power_off_store(struct device *dev,
298 struct device_attribute *attr,
299 const char *buf, size_t n)
300{
301 int ret;
302
303 if (kstrtoint(buf, 0, &ret))
304 return -EINVAL;
305
306 if (ret != 0 && ret != 1)
307 return -EINVAL;
308
309 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
310 return ret < 0 ? ret : n;
311}
312
313static DEVICE_ATTR_RW(pm_qos_no_power_off);
314
315#ifdef CONFIG_PM_SLEEP
316static const char _enabled[] = "enabled";
317static const char _disabled[] = "disabled";
318
319static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
320 char *buf)
321{
322 return sprintf(buf, "%s\n", device_can_wakeup(dev)
323 ? (device_may_wakeup(dev) ? _enabled : _disabled)
324 : "");
325}
326
327static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
328 const char *buf, size_t n)
329{
330 if (!device_can_wakeup(dev))
331 return -EINVAL;
332
333 if (sysfs_streq(buf, _enabled))
334 device_set_wakeup_enable(dev, 1);
335 else if (sysfs_streq(buf, _disabled))
336 device_set_wakeup_enable(dev, 0);
337 else
338 return -EINVAL;
339 return n;
340}
341
342static DEVICE_ATTR_RW(wakeup);
343
344static ssize_t wakeup_count_show(struct device *dev,
345 struct device_attribute *attr, char *buf)
346{
347 unsigned long count = 0;
348 bool enabled = false;
349
350 spin_lock_irq(&dev->power.lock);
351 if (dev->power.wakeup) {
352 count = dev->power.wakeup->wakeup_count;
353 enabled = true;
354 }
355 spin_unlock_irq(&dev->power.lock);
356 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
357}
358
359static DEVICE_ATTR_RO(wakeup_count);
360
361static ssize_t wakeup_active_count_show(struct device *dev,
362 struct device_attribute *attr,
363 char *buf)
364{
365 unsigned long count = 0;
366 bool enabled = false;
367
368 spin_lock_irq(&dev->power.lock);
369 if (dev->power.wakeup) {
370 count = dev->power.wakeup->active_count;
371 enabled = true;
372 }
373 spin_unlock_irq(&dev->power.lock);
374 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
375}
376
377static DEVICE_ATTR_RO(wakeup_active_count);
378
379static ssize_t wakeup_abort_count_show(struct device *dev,
380 struct device_attribute *attr,
381 char *buf)
382{
383 unsigned long count = 0;
384 bool enabled = false;
385
386 spin_lock_irq(&dev->power.lock);
387 if (dev->power.wakeup) {
388 count = dev->power.wakeup->wakeup_count;
389 enabled = true;
390 }
391 spin_unlock_irq(&dev->power.lock);
392 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
393}
394
395static DEVICE_ATTR_RO(wakeup_abort_count);
396
397static ssize_t wakeup_expire_count_show(struct device *dev,
398 struct device_attribute *attr,
399 char *buf)
400{
401 unsigned long count = 0;
402 bool enabled = false;
403
404 spin_lock_irq(&dev->power.lock);
405 if (dev->power.wakeup) {
406 count = dev->power.wakeup->expire_count;
407 enabled = true;
408 }
409 spin_unlock_irq(&dev->power.lock);
410 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
411}
412
413static DEVICE_ATTR_RO(wakeup_expire_count);
414
415static ssize_t wakeup_active_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 unsigned int active = 0;
419 bool enabled = false;
420
421 spin_lock_irq(&dev->power.lock);
422 if (dev->power.wakeup) {
423 active = dev->power.wakeup->active;
424 enabled = true;
425 }
426 spin_unlock_irq(&dev->power.lock);
427 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
428}
429
430static DEVICE_ATTR_RO(wakeup_active);
431
432static ssize_t wakeup_total_time_ms_show(struct device *dev,
433 struct device_attribute *attr,
434 char *buf)
435{
436 s64 msec = 0;
437 bool enabled = false;
438
439 spin_lock_irq(&dev->power.lock);
440 if (dev->power.wakeup) {
441 msec = ktime_to_ms(dev->power.wakeup->total_time);
442 enabled = true;
443 }
444 spin_unlock_irq(&dev->power.lock);
445 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
446}
447
448static DEVICE_ATTR_RO(wakeup_total_time_ms);
449
450static ssize_t wakeup_max_time_ms_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
453 s64 msec = 0;
454 bool enabled = false;
455
456 spin_lock_irq(&dev->power.lock);
457 if (dev->power.wakeup) {
458 msec = ktime_to_ms(dev->power.wakeup->max_time);
459 enabled = true;
460 }
461 spin_unlock_irq(&dev->power.lock);
462 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
463}
464
465static DEVICE_ATTR_RO(wakeup_max_time_ms);
466
467static ssize_t wakeup_last_time_ms_show(struct device *dev,
468 struct device_attribute *attr,
469 char *buf)
470{
471 s64 msec = 0;
472 bool enabled = false;
473
474 spin_lock_irq(&dev->power.lock);
475 if (dev->power.wakeup) {
476 msec = ktime_to_ms(dev->power.wakeup->last_time);
477 enabled = true;
478 }
479 spin_unlock_irq(&dev->power.lock);
480 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
481}
482
483static DEVICE_ATTR_RO(wakeup_last_time_ms);
484
485#ifdef CONFIG_PM_AUTOSLEEP
486static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
487 struct device_attribute *attr,
488 char *buf)
489{
490 s64 msec = 0;
491 bool enabled = false;
492
493 spin_lock_irq(&dev->power.lock);
494 if (dev->power.wakeup) {
495 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
496 enabled = true;
497 }
498 spin_unlock_irq(&dev->power.lock);
499 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
500}
501
502static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
503#endif /* CONFIG_PM_AUTOSLEEP */
504#endif /* CONFIG_PM_SLEEP */
505
506#ifdef CONFIG_PM_ADVANCED_DEBUG
507static ssize_t runtime_usage_show(struct device *dev,
508 struct device_attribute *attr, char *buf)
509{
510 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
511}
512static DEVICE_ATTR_RO(runtime_usage);
513
514static ssize_t runtime_active_kids_show(struct device *dev,
515 struct device_attribute *attr,
516 char *buf)
517{
518 return sprintf(buf, "%d\n", dev->power.ignore_children ?
519 0 : atomic_read(&dev->power.child_count));
520}
521static DEVICE_ATTR_RO(runtime_active_kids);
522
523static ssize_t runtime_enabled_show(struct device *dev,
524 struct device_attribute *attr, char *buf)
525{
526 if (dev->power.disable_depth && (dev->power.runtime_auto == false))
527 return sprintf(buf, "disabled & forbidden\n");
528 if (dev->power.disable_depth)
529 return sprintf(buf, "disabled\n");
530 if (dev->power.runtime_auto == false)
531 return sprintf(buf, "forbidden\n");
532 return sprintf(buf, "enabled\n");
533}
534static DEVICE_ATTR_RO(runtime_enabled);
535
536#ifdef CONFIG_PM_SLEEP
537static ssize_t async_show(struct device *dev, struct device_attribute *attr,
538 char *buf)
539{
540 return sprintf(buf, "%s\n",
541 device_async_suspend_enabled(dev) ?
542 _enabled : _disabled);
543}
544
545static ssize_t async_store(struct device *dev, struct device_attribute *attr,
546 const char *buf, size_t n)
547{
548 if (sysfs_streq(buf, _enabled))
549 device_enable_async_suspend(dev);
550 else if (sysfs_streq(buf, _disabled))
551 device_disable_async_suspend(dev);
552 else
553 return -EINVAL;
554 return n;
555}
556
557static DEVICE_ATTR_RW(async);
558
559#endif /* CONFIG_PM_SLEEP */
560#endif /* CONFIG_PM_ADVANCED_DEBUG */
561
562static struct attribute *power_attrs[] = {
563#ifdef CONFIG_PM_ADVANCED_DEBUG
564#ifdef CONFIG_PM_SLEEP
565 &dev_attr_async.attr,
566#endif
567 &dev_attr_runtime_status.attr,
568 &dev_attr_runtime_usage.attr,
569 &dev_attr_runtime_active_kids.attr,
570 &dev_attr_runtime_enabled.attr,
571#endif /* CONFIG_PM_ADVANCED_DEBUG */
572 NULL,
573};
574static const struct attribute_group pm_attr_group = {
575 .name = power_group_name,
576 .attrs = power_attrs,
577};
578
579static struct attribute *wakeup_attrs[] = {
580#ifdef CONFIG_PM_SLEEP
581 &dev_attr_wakeup.attr,
582 &dev_attr_wakeup_count.attr,
583 &dev_attr_wakeup_active_count.attr,
584 &dev_attr_wakeup_abort_count.attr,
585 &dev_attr_wakeup_expire_count.attr,
586 &dev_attr_wakeup_active.attr,
587 &dev_attr_wakeup_total_time_ms.attr,
588 &dev_attr_wakeup_max_time_ms.attr,
589 &dev_attr_wakeup_last_time_ms.attr,
590#ifdef CONFIG_PM_AUTOSLEEP
591 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
592#endif
593#endif
594 NULL,
595};
596static const struct attribute_group pm_wakeup_attr_group = {
597 .name = power_group_name,
598 .attrs = wakeup_attrs,
599};
600
601static struct attribute *runtime_attrs[] = {
602#ifndef CONFIG_PM_ADVANCED_DEBUG
603 &dev_attr_runtime_status.attr,
604#endif
605 &dev_attr_control.attr,
606 &dev_attr_runtime_suspended_time.attr,
607 &dev_attr_runtime_active_time.attr,
608 &dev_attr_autosuspend_delay_ms.attr,
609 NULL,
610};
611static const struct attribute_group pm_runtime_attr_group = {
612 .name = power_group_name,
613 .attrs = runtime_attrs,
614};
615
616static struct attribute *pm_qos_resume_latency_attrs[] = {
617 &dev_attr_pm_qos_resume_latency_us.attr,
618 NULL,
619};
620static const struct attribute_group pm_qos_resume_latency_attr_group = {
621 .name = power_group_name,
622 .attrs = pm_qos_resume_latency_attrs,
623};
624
625static struct attribute *pm_qos_latency_tolerance_attrs[] = {
626 &dev_attr_pm_qos_latency_tolerance_us.attr,
627 NULL,
628};
629static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
630 .name = power_group_name,
631 .attrs = pm_qos_latency_tolerance_attrs,
632};
633
634static struct attribute *pm_qos_flags_attrs[] = {
635 &dev_attr_pm_qos_no_power_off.attr,
636 NULL,
637};
638static const struct attribute_group pm_qos_flags_attr_group = {
639 .name = power_group_name,
640 .attrs = pm_qos_flags_attrs,
641};
642
643int dpm_sysfs_add(struct device *dev)
644{
645 int rc;
646
647 /* No need to create PM sysfs if explicitly disabled. */
648 if (device_pm_not_required(dev))
649 return 0;
650
651 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
652 if (rc)
653 return rc;
654
655 if (pm_runtime_callbacks_present(dev)) {
656 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
657 if (rc)
658 goto err_out;
659 }
660 if (device_can_wakeup(dev)) {
661 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
662 if (rc)
663 goto err_runtime;
664 }
665 if (dev->power.set_latency_tolerance) {
666 rc = sysfs_merge_group(&dev->kobj,
667 &pm_qos_latency_tolerance_attr_group);
668 if (rc)
669 goto err_wakeup;
670 }
671 rc = pm_wakeup_source_sysfs_add(dev);
672 if (rc)
673 goto err_latency;
674 return 0;
675
676 err_latency:
677 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
678 err_wakeup:
679 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
680 err_runtime:
681 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
682 err_out:
683 sysfs_remove_group(&dev->kobj, &pm_attr_group);
684 return rc;
685}
686
687int wakeup_sysfs_add(struct device *dev)
688{
689 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
690}
691
692void wakeup_sysfs_remove(struct device *dev)
693{
694 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
695}
696
697int pm_qos_sysfs_add_resume_latency(struct device *dev)
698{
699 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
700}
701
702void pm_qos_sysfs_remove_resume_latency(struct device *dev)
703{
704 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
705}
706
707int pm_qos_sysfs_add_flags(struct device *dev)
708{
709 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
710}
711
712void pm_qos_sysfs_remove_flags(struct device *dev)
713{
714 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
715}
716
717int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
718{
719 return sysfs_merge_group(&dev->kobj,
720 &pm_qos_latency_tolerance_attr_group);
721}
722
723void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
724{
725 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
726}
727
728void rpm_sysfs_remove(struct device *dev)
729{
730 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
731}
732
733void dpm_sysfs_remove(struct device *dev)
734{
735 if (device_pm_not_required(dev))
736 return;
737 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
738 dev_pm_qos_constraints_destroy(dev);
739 rpm_sysfs_remove(dev);
740 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
741 sysfs_remove_group(&dev->kobj, &pm_attr_group);
742}
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 spin_lock_irq(&dev->power.lock);
129 update_pm_runtime_accounting(dev);
130 ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
131 spin_unlock_irq(&dev->power.lock);
132 return ret;
133}
134
135static DEVICE_ATTR_RO(runtime_active_time);
136
137static ssize_t runtime_suspended_time_show(struct device *dev,
138 struct device_attribute *attr, char *buf)
139{
140 int ret;
141 spin_lock_irq(&dev->power.lock);
142 update_pm_runtime_accounting(dev);
143 ret = sprintf(buf, "%i\n",
144 jiffies_to_msecs(dev->power.suspended_jiffies));
145 spin_unlock_irq(&dev->power.lock);
146 return ret;
147}
148
149static DEVICE_ATTR_RO(runtime_suspended_time);
150
151static ssize_t runtime_status_show(struct device *dev,
152 struct device_attribute *attr, char *buf)
153{
154 const char *p;
155
156 if (dev->power.runtime_error) {
157 p = "error\n";
158 } else if (dev->power.disable_depth) {
159 p = "unsupported\n";
160 } else {
161 switch (dev->power.runtime_status) {
162 case RPM_SUSPENDED:
163 p = "suspended\n";
164 break;
165 case RPM_SUSPENDING:
166 p = "suspending\n";
167 break;
168 case RPM_RESUMING:
169 p = "resuming\n";
170 break;
171 case RPM_ACTIVE:
172 p = "active\n";
173 break;
174 default:
175 return -EIO;
176 }
177 }
178 return sprintf(buf, p);
179}
180
181static DEVICE_ATTR_RO(runtime_status);
182
183static ssize_t autosuspend_delay_ms_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
185{
186 if (!dev->power.use_autosuspend)
187 return -EIO;
188 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
189}
190
191static ssize_t autosuspend_delay_ms_store(struct device *dev,
192 struct device_attribute *attr, const char *buf, size_t n)
193{
194 long delay;
195
196 if (!dev->power.use_autosuspend)
197 return -EIO;
198
199 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
200 return -EINVAL;
201
202 device_lock(dev);
203 pm_runtime_set_autosuspend_delay(dev, delay);
204 device_unlock(dev);
205 return n;
206}
207
208static DEVICE_ATTR_RW(autosuspend_delay_ms);
209
210static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
211 struct device_attribute *attr,
212 char *buf)
213{
214 s32 value = dev_pm_qos_requested_resume_latency(dev);
215
216 if (value == 0)
217 return sprintf(buf, "n/a\n");
218 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
219 value = 0;
220
221 return sprintf(buf, "%d\n", value);
222}
223
224static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
225 struct device_attribute *attr,
226 const char *buf, size_t n)
227{
228 s32 value;
229 int ret;
230
231 if (!kstrtos32(buf, 0, &value)) {
232 /*
233 * Prevent users from writing negative or "no constraint" values
234 * directly.
235 */
236 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
237 return -EINVAL;
238
239 if (value == 0)
240 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
241 } else if (sysfs_streq(buf, "n/a")) {
242 value = 0;
243 } else {
244 return -EINVAL;
245 }
246
247 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
248 value);
249 return ret < 0 ? ret : n;
250}
251
252static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
253
254static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
255 struct device_attribute *attr,
256 char *buf)
257{
258 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
259
260 if (value < 0)
261 return sprintf(buf, "auto\n");
262 if (value == PM_QOS_LATENCY_ANY)
263 return sprintf(buf, "any\n");
264
265 return sprintf(buf, "%d\n", value);
266}
267
268static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
269 struct device_attribute *attr,
270 const char *buf, size_t n)
271{
272 s32 value;
273 int ret;
274
275 if (kstrtos32(buf, 0, &value) == 0) {
276 /* Users can't write negative values directly */
277 if (value < 0)
278 return -EINVAL;
279 } else {
280 if (sysfs_streq(buf, "auto"))
281 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
282 else if (sysfs_streq(buf, "any"))
283 value = PM_QOS_LATENCY_ANY;
284 else
285 return -EINVAL;
286 }
287 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
288 return ret < 0 ? ret : n;
289}
290
291static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
292
293static ssize_t pm_qos_no_power_off_show(struct device *dev,
294 struct device_attribute *attr,
295 char *buf)
296{
297 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
298 & PM_QOS_FLAG_NO_POWER_OFF));
299}
300
301static ssize_t pm_qos_no_power_off_store(struct device *dev,
302 struct device_attribute *attr,
303 const char *buf, size_t n)
304{
305 int ret;
306
307 if (kstrtoint(buf, 0, &ret))
308 return -EINVAL;
309
310 if (ret != 0 && ret != 1)
311 return -EINVAL;
312
313 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
314 return ret < 0 ? ret : n;
315}
316
317static DEVICE_ATTR_RW(pm_qos_no_power_off);
318
319#ifdef CONFIG_PM_SLEEP
320static const char _enabled[] = "enabled";
321static const char _disabled[] = "disabled";
322
323static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
324 char *buf)
325{
326 return sprintf(buf, "%s\n", device_can_wakeup(dev)
327 ? (device_may_wakeup(dev) ? _enabled : _disabled)
328 : "");
329}
330
331static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
332 const char *buf, size_t n)
333{
334 if (!device_can_wakeup(dev))
335 return -EINVAL;
336
337 if (sysfs_streq(buf, _enabled))
338 device_set_wakeup_enable(dev, 1);
339 else if (sysfs_streq(buf, _disabled))
340 device_set_wakeup_enable(dev, 0);
341 else
342 return -EINVAL;
343 return n;
344}
345
346static DEVICE_ATTR_RW(wakeup);
347
348static ssize_t wakeup_count_show(struct device *dev,
349 struct device_attribute *attr, char *buf)
350{
351 unsigned long count = 0;
352 bool enabled = false;
353
354 spin_lock_irq(&dev->power.lock);
355 if (dev->power.wakeup) {
356 count = dev->power.wakeup->event_count;
357 enabled = true;
358 }
359 spin_unlock_irq(&dev->power.lock);
360 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
361}
362
363static DEVICE_ATTR_RO(wakeup_count);
364
365static ssize_t wakeup_active_count_show(struct device *dev,
366 struct device_attribute *attr,
367 char *buf)
368{
369 unsigned long count = 0;
370 bool enabled = false;
371
372 spin_lock_irq(&dev->power.lock);
373 if (dev->power.wakeup) {
374 count = dev->power.wakeup->active_count;
375 enabled = true;
376 }
377 spin_unlock_irq(&dev->power.lock);
378 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
379}
380
381static DEVICE_ATTR_RO(wakeup_active_count);
382
383static ssize_t wakeup_abort_count_show(struct device *dev,
384 struct device_attribute *attr,
385 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->wakeup_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
399static DEVICE_ATTR_RO(wakeup_abort_count);
400
401static ssize_t wakeup_expire_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->expire_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
417static DEVICE_ATTR_RO(wakeup_expire_count);
418
419static ssize_t wakeup_active_show(struct device *dev,
420 struct device_attribute *attr, char *buf)
421{
422 unsigned int active = 0;
423 bool enabled = false;
424
425 spin_lock_irq(&dev->power.lock);
426 if (dev->power.wakeup) {
427 active = dev->power.wakeup->active;
428 enabled = true;
429 }
430 spin_unlock_irq(&dev->power.lock);
431 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
432}
433
434static DEVICE_ATTR_RO(wakeup_active);
435
436static ssize_t wakeup_total_time_ms_show(struct device *dev,
437 struct device_attribute *attr,
438 char *buf)
439{
440 s64 msec = 0;
441 bool enabled = false;
442
443 spin_lock_irq(&dev->power.lock);
444 if (dev->power.wakeup) {
445 msec = ktime_to_ms(dev->power.wakeup->total_time);
446 enabled = true;
447 }
448 spin_unlock_irq(&dev->power.lock);
449 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
450}
451
452static DEVICE_ATTR_RO(wakeup_total_time_ms);
453
454static ssize_t wakeup_max_time_ms_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->max_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
469static DEVICE_ATTR_RO(wakeup_max_time_ms);
470
471static ssize_t wakeup_last_time_ms_show(struct device *dev,
472 struct device_attribute *attr,
473 char *buf)
474{
475 s64 msec = 0;
476 bool enabled = false;
477
478 spin_lock_irq(&dev->power.lock);
479 if (dev->power.wakeup) {
480 msec = ktime_to_ms(dev->power.wakeup->last_time);
481 enabled = true;
482 }
483 spin_unlock_irq(&dev->power.lock);
484 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
485}
486
487static DEVICE_ATTR_RO(wakeup_last_time_ms);
488
489#ifdef CONFIG_PM_AUTOSLEEP
490static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
491 struct device_attribute *attr,
492 char *buf)
493{
494 s64 msec = 0;
495 bool enabled = false;
496
497 spin_lock_irq(&dev->power.lock);
498 if (dev->power.wakeup) {
499 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
500 enabled = true;
501 }
502 spin_unlock_irq(&dev->power.lock);
503 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
504}
505
506static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
507#endif /* CONFIG_PM_AUTOSLEEP */
508#endif /* CONFIG_PM_SLEEP */
509
510#ifdef CONFIG_PM_ADVANCED_DEBUG
511static ssize_t runtime_usage_show(struct device *dev,
512 struct device_attribute *attr, char *buf)
513{
514 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
515}
516static DEVICE_ATTR_RO(runtime_usage);
517
518static ssize_t runtime_active_kids_show(struct device *dev,
519 struct device_attribute *attr,
520 char *buf)
521{
522 return sprintf(buf, "%d\n", dev->power.ignore_children ?
523 0 : atomic_read(&dev->power.child_count));
524}
525static DEVICE_ATTR_RO(runtime_active_kids);
526
527static ssize_t runtime_enabled_show(struct device *dev,
528 struct device_attribute *attr, char *buf)
529{
530 if (dev->power.disable_depth && (dev->power.runtime_auto == false))
531 return sprintf(buf, "disabled & forbidden\n");
532 if (dev->power.disable_depth)
533 return sprintf(buf, "disabled\n");
534 if (dev->power.runtime_auto == false)
535 return sprintf(buf, "forbidden\n");
536 return sprintf(buf, "enabled\n");
537}
538static DEVICE_ATTR_RO(runtime_enabled);
539
540#ifdef CONFIG_PM_SLEEP
541static ssize_t async_show(struct device *dev, struct device_attribute *attr,
542 char *buf)
543{
544 return sprintf(buf, "%s\n",
545 device_async_suspend_enabled(dev) ?
546 _enabled : _disabled);
547}
548
549static ssize_t async_store(struct device *dev, struct device_attribute *attr,
550 const char *buf, size_t n)
551{
552 if (sysfs_streq(buf, _enabled))
553 device_enable_async_suspend(dev);
554 else if (sysfs_streq(buf, _disabled))
555 device_disable_async_suspend(dev);
556 else
557 return -EINVAL;
558 return n;
559}
560
561static DEVICE_ATTR_RW(async);
562
563#endif /* CONFIG_PM_SLEEP */
564#endif /* CONFIG_PM_ADVANCED_DEBUG */
565
566static struct attribute *power_attrs[] = {
567#ifdef CONFIG_PM_ADVANCED_DEBUG
568#ifdef CONFIG_PM_SLEEP
569 &dev_attr_async.attr,
570#endif
571 &dev_attr_runtime_status.attr,
572 &dev_attr_runtime_usage.attr,
573 &dev_attr_runtime_active_kids.attr,
574 &dev_attr_runtime_enabled.attr,
575#endif /* CONFIG_PM_ADVANCED_DEBUG */
576 NULL,
577};
578static const struct attribute_group pm_attr_group = {
579 .name = power_group_name,
580 .attrs = power_attrs,
581};
582
583static struct attribute *wakeup_attrs[] = {
584#ifdef CONFIG_PM_SLEEP
585 &dev_attr_wakeup.attr,
586 &dev_attr_wakeup_count.attr,
587 &dev_attr_wakeup_active_count.attr,
588 &dev_attr_wakeup_abort_count.attr,
589 &dev_attr_wakeup_expire_count.attr,
590 &dev_attr_wakeup_active.attr,
591 &dev_attr_wakeup_total_time_ms.attr,
592 &dev_attr_wakeup_max_time_ms.attr,
593 &dev_attr_wakeup_last_time_ms.attr,
594#ifdef CONFIG_PM_AUTOSLEEP
595 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
596#endif
597#endif
598 NULL,
599};
600static const struct attribute_group pm_wakeup_attr_group = {
601 .name = power_group_name,
602 .attrs = wakeup_attrs,
603};
604
605static struct attribute *runtime_attrs[] = {
606#ifndef CONFIG_PM_ADVANCED_DEBUG
607 &dev_attr_runtime_status.attr,
608#endif
609 &dev_attr_control.attr,
610 &dev_attr_runtime_suspended_time.attr,
611 &dev_attr_runtime_active_time.attr,
612 &dev_attr_autosuspend_delay_ms.attr,
613 NULL,
614};
615static const struct attribute_group pm_runtime_attr_group = {
616 .name = power_group_name,
617 .attrs = runtime_attrs,
618};
619
620static struct attribute *pm_qos_resume_latency_attrs[] = {
621 &dev_attr_pm_qos_resume_latency_us.attr,
622 NULL,
623};
624static const struct attribute_group pm_qos_resume_latency_attr_group = {
625 .name = power_group_name,
626 .attrs = pm_qos_resume_latency_attrs,
627};
628
629static struct attribute *pm_qos_latency_tolerance_attrs[] = {
630 &dev_attr_pm_qos_latency_tolerance_us.attr,
631 NULL,
632};
633static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
634 .name = power_group_name,
635 .attrs = pm_qos_latency_tolerance_attrs,
636};
637
638static struct attribute *pm_qos_flags_attrs[] = {
639 &dev_attr_pm_qos_no_power_off.attr,
640 NULL,
641};
642static const struct attribute_group pm_qos_flags_attr_group = {
643 .name = power_group_name,
644 .attrs = pm_qos_flags_attrs,
645};
646
647int dpm_sysfs_add(struct device *dev)
648{
649 int rc;
650
651 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
652 if (rc)
653 return rc;
654
655 if (pm_runtime_callbacks_present(dev)) {
656 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
657 if (rc)
658 goto err_out;
659 }
660 if (device_can_wakeup(dev)) {
661 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
662 if (rc)
663 goto err_runtime;
664 }
665 if (dev->power.set_latency_tolerance) {
666 rc = sysfs_merge_group(&dev->kobj,
667 &pm_qos_latency_tolerance_attr_group);
668 if (rc)
669 goto err_wakeup;
670 }
671 return 0;
672
673 err_wakeup:
674 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
675 err_runtime:
676 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
677 err_out:
678 sysfs_remove_group(&dev->kobj, &pm_attr_group);
679 return rc;
680}
681
682int wakeup_sysfs_add(struct device *dev)
683{
684 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
685}
686
687void wakeup_sysfs_remove(struct device *dev)
688{
689 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
690}
691
692int pm_qos_sysfs_add_resume_latency(struct device *dev)
693{
694 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
695}
696
697void pm_qos_sysfs_remove_resume_latency(struct device *dev)
698{
699 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
700}
701
702int pm_qos_sysfs_add_flags(struct device *dev)
703{
704 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
705}
706
707void pm_qos_sysfs_remove_flags(struct device *dev)
708{
709 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
710}
711
712int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
713{
714 return sysfs_merge_group(&dev->kobj,
715 &pm_qos_latency_tolerance_attr_group);
716}
717
718void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
719{
720 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
721}
722
723void rpm_sysfs_remove(struct device *dev)
724{
725 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
726}
727
728void dpm_sysfs_remove(struct device *dev)
729{
730 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
731 dev_pm_qos_constraints_destroy(dev);
732 rpm_sysfs_remove(dev);
733 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
734 sysfs_remove_group(&dev->kobj, &pm_attr_group);
735}