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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
95static const char enabled[] = "enabled";
96static const char disabled[] = "disabled";
97
98const char power_group_name[] = "power";
99EXPORT_SYMBOL_GPL(power_group_name);
100
101#ifdef CONFIG_PM_RUNTIME
102static const char ctrl_auto[] = "auto";
103static const char ctrl_on[] = "on";
104
105static ssize_t control_show(struct device *dev, struct device_attribute *attr,
106 char *buf)
107{
108 return sprintf(buf, "%s\n",
109 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
110}
111
112static ssize_t control_store(struct device * dev, struct device_attribute *attr,
113 const char * buf, size_t n)
114{
115 char *cp;
116 int len = n;
117
118 cp = memchr(buf, '\n', n);
119 if (cp)
120 len = cp - buf;
121 device_lock(dev);
122 if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
123 pm_runtime_allow(dev);
124 else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
125 pm_runtime_forbid(dev);
126 else
127 n = -EINVAL;
128 device_unlock(dev);
129 return n;
130}
131
132static DEVICE_ATTR(control, 0644, control_show, control_store);
133
134static ssize_t rtpm_active_time_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
136{
137 int ret;
138 spin_lock_irq(&dev->power.lock);
139 update_pm_runtime_accounting(dev);
140 ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
141 spin_unlock_irq(&dev->power.lock);
142 return ret;
143}
144
145static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
146
147static ssize_t rtpm_suspended_time_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149{
150 int ret;
151 spin_lock_irq(&dev->power.lock);
152 update_pm_runtime_accounting(dev);
153 ret = sprintf(buf, "%i\n",
154 jiffies_to_msecs(dev->power.suspended_jiffies));
155 spin_unlock_irq(&dev->power.lock);
156 return ret;
157}
158
159static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
160
161static ssize_t rtpm_status_show(struct device *dev,
162 struct device_attribute *attr, char *buf)
163{
164 const char *p;
165
166 if (dev->power.runtime_error) {
167 p = "error\n";
168 } else if (dev->power.disable_depth) {
169 p = "unsupported\n";
170 } else {
171 switch (dev->power.runtime_status) {
172 case RPM_SUSPENDED:
173 p = "suspended\n";
174 break;
175 case RPM_SUSPENDING:
176 p = "suspending\n";
177 break;
178 case RPM_RESUMING:
179 p = "resuming\n";
180 break;
181 case RPM_ACTIVE:
182 p = "active\n";
183 break;
184 default:
185 return -EIO;
186 }
187 }
188 return sprintf(buf, p);
189}
190
191static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
192
193static ssize_t autosuspend_delay_ms_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 if (!dev->power.use_autosuspend)
197 return -EIO;
198 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
199}
200
201static ssize_t autosuspend_delay_ms_store(struct device *dev,
202 struct device_attribute *attr, const char *buf, size_t n)
203{
204 long delay;
205
206 if (!dev->power.use_autosuspend)
207 return -EIO;
208
209 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
210 return -EINVAL;
211
212 device_lock(dev);
213 pm_runtime_set_autosuspend_delay(dev, delay);
214 device_unlock(dev);
215 return n;
216}
217
218static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
219 autosuspend_delay_ms_store);
220
221static ssize_t pm_qos_resume_latency_show(struct device *dev,
222 struct device_attribute *attr,
223 char *buf)
224{
225 return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
226}
227
228static ssize_t pm_qos_resume_latency_store(struct device *dev,
229 struct device_attribute *attr,
230 const char *buf, size_t n)
231{
232 s32 value;
233 int ret;
234
235 if (kstrtos32(buf, 0, &value))
236 return -EINVAL;
237
238 if (value < 0)
239 return -EINVAL;
240
241 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
242 value);
243 return ret < 0 ? ret : n;
244}
245
246static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
247 pm_qos_resume_latency_show, pm_qos_resume_latency_store);
248
249static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
250 struct device_attribute *attr,
251 char *buf)
252{
253 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
254
255 if (value < 0)
256 return sprintf(buf, "auto\n");
257 else if (value == PM_QOS_LATENCY_ANY)
258 return sprintf(buf, "any\n");
259
260 return sprintf(buf, "%d\n", value);
261}
262
263static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
264 struct device_attribute *attr,
265 const char *buf, size_t n)
266{
267 s32 value;
268 int ret;
269
270 if (kstrtos32(buf, 0, &value)) {
271 if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
272 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
273 else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
274 value = PM_QOS_LATENCY_ANY;
275 }
276 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
277 return ret < 0 ? ret : n;
278}
279
280static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
281 pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
282
283static ssize_t pm_qos_no_power_off_show(struct device *dev,
284 struct device_attribute *attr,
285 char *buf)
286{
287 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
288 & PM_QOS_FLAG_NO_POWER_OFF));
289}
290
291static ssize_t pm_qos_no_power_off_store(struct device *dev,
292 struct device_attribute *attr,
293 const char *buf, size_t n)
294{
295 int ret;
296
297 if (kstrtoint(buf, 0, &ret))
298 return -EINVAL;
299
300 if (ret != 0 && ret != 1)
301 return -EINVAL;
302
303 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
304 return ret < 0 ? ret : n;
305}
306
307static DEVICE_ATTR(pm_qos_no_power_off, 0644,
308 pm_qos_no_power_off_show, pm_qos_no_power_off_store);
309
310static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
311 struct device_attribute *attr,
312 char *buf)
313{
314 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
315 & PM_QOS_FLAG_REMOTE_WAKEUP));
316}
317
318static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
319 struct device_attribute *attr,
320 const char *buf, size_t n)
321{
322 int ret;
323
324 if (kstrtoint(buf, 0, &ret))
325 return -EINVAL;
326
327 if (ret != 0 && ret != 1)
328 return -EINVAL;
329
330 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP, ret);
331 return ret < 0 ? ret : n;
332}
333
334static DEVICE_ATTR(pm_qos_remote_wakeup, 0644,
335 pm_qos_remote_wakeup_show, pm_qos_remote_wakeup_store);
336#endif /* CONFIG_PM_RUNTIME */
337
338#ifdef CONFIG_PM_SLEEP
339static ssize_t
340wake_show(struct device * dev, struct device_attribute *attr, char * buf)
341{
342 return sprintf(buf, "%s\n", device_can_wakeup(dev)
343 ? (device_may_wakeup(dev) ? enabled : disabled)
344 : "");
345}
346
347static ssize_t
348wake_store(struct device * dev, struct device_attribute *attr,
349 const char * buf, size_t n)
350{
351 char *cp;
352 int len = n;
353
354 if (!device_can_wakeup(dev))
355 return -EINVAL;
356
357 cp = memchr(buf, '\n', n);
358 if (cp)
359 len = cp - buf;
360 if (len == sizeof enabled - 1
361 && strncmp(buf, enabled, sizeof enabled - 1) == 0)
362 device_set_wakeup_enable(dev, 1);
363 else if (len == sizeof disabled - 1
364 && strncmp(buf, disabled, sizeof disabled - 1) == 0)
365 device_set_wakeup_enable(dev, 0);
366 else
367 return -EINVAL;
368 return n;
369}
370
371static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
372
373static ssize_t wakeup_count_show(struct device *dev,
374 struct device_attribute *attr, char *buf)
375{
376 unsigned long count = 0;
377 bool enabled = false;
378
379 spin_lock_irq(&dev->power.lock);
380 if (dev->power.wakeup) {
381 count = dev->power.wakeup->event_count;
382 enabled = true;
383 }
384 spin_unlock_irq(&dev->power.lock);
385 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
386}
387
388static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
389
390static ssize_t wakeup_active_count_show(struct device *dev,
391 struct device_attribute *attr, char *buf)
392{
393 unsigned long count = 0;
394 bool enabled = false;
395
396 spin_lock_irq(&dev->power.lock);
397 if (dev->power.wakeup) {
398 count = dev->power.wakeup->active_count;
399 enabled = true;
400 }
401 spin_unlock_irq(&dev->power.lock);
402 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
403}
404
405static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
406
407static ssize_t wakeup_abort_count_show(struct device *dev,
408 struct device_attribute *attr,
409 char *buf)
410{
411 unsigned long count = 0;
412 bool enabled = false;
413
414 spin_lock_irq(&dev->power.lock);
415 if (dev->power.wakeup) {
416 count = dev->power.wakeup->wakeup_count;
417 enabled = true;
418 }
419 spin_unlock_irq(&dev->power.lock);
420 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
421}
422
423static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
424
425static ssize_t wakeup_expire_count_show(struct device *dev,
426 struct device_attribute *attr,
427 char *buf)
428{
429 unsigned long count = 0;
430 bool enabled = false;
431
432 spin_lock_irq(&dev->power.lock);
433 if (dev->power.wakeup) {
434 count = dev->power.wakeup->expire_count;
435 enabled = true;
436 }
437 spin_unlock_irq(&dev->power.lock);
438 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
439}
440
441static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
442
443static ssize_t wakeup_active_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
445{
446 unsigned int active = 0;
447 bool enabled = false;
448
449 spin_lock_irq(&dev->power.lock);
450 if (dev->power.wakeup) {
451 active = dev->power.wakeup->active;
452 enabled = true;
453 }
454 spin_unlock_irq(&dev->power.lock);
455 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
456}
457
458static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
459
460static ssize_t wakeup_total_time_show(struct device *dev,
461 struct device_attribute *attr, char *buf)
462{
463 s64 msec = 0;
464 bool enabled = false;
465
466 spin_lock_irq(&dev->power.lock);
467 if (dev->power.wakeup) {
468 msec = ktime_to_ms(dev->power.wakeup->total_time);
469 enabled = true;
470 }
471 spin_unlock_irq(&dev->power.lock);
472 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
473}
474
475static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
476
477static ssize_t wakeup_max_time_show(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
480 s64 msec = 0;
481 bool enabled = false;
482
483 spin_lock_irq(&dev->power.lock);
484 if (dev->power.wakeup) {
485 msec = ktime_to_ms(dev->power.wakeup->max_time);
486 enabled = true;
487 }
488 spin_unlock_irq(&dev->power.lock);
489 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
490}
491
492static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
493
494static ssize_t wakeup_last_time_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
496{
497 s64 msec = 0;
498 bool enabled = false;
499
500 spin_lock_irq(&dev->power.lock);
501 if (dev->power.wakeup) {
502 msec = ktime_to_ms(dev->power.wakeup->last_time);
503 enabled = true;
504 }
505 spin_unlock_irq(&dev->power.lock);
506 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
507}
508
509static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
510
511#ifdef CONFIG_PM_AUTOSLEEP
512static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
513 struct device_attribute *attr,
514 char *buf)
515{
516 s64 msec = 0;
517 bool enabled = false;
518
519 spin_lock_irq(&dev->power.lock);
520 if (dev->power.wakeup) {
521 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
522 enabled = true;
523 }
524 spin_unlock_irq(&dev->power.lock);
525 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
526}
527
528static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
529 wakeup_prevent_sleep_time_show, NULL);
530#endif /* CONFIG_PM_AUTOSLEEP */
531#endif /* CONFIG_PM_SLEEP */
532
533#ifdef CONFIG_PM_ADVANCED_DEBUG
534#ifdef CONFIG_PM_RUNTIME
535
536static ssize_t rtpm_usagecount_show(struct device *dev,
537 struct device_attribute *attr, char *buf)
538{
539 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
540}
541
542static ssize_t rtpm_children_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544{
545 return sprintf(buf, "%d\n", dev->power.ignore_children ?
546 0 : atomic_read(&dev->power.child_count));
547}
548
549static ssize_t rtpm_enabled_show(struct device *dev,
550 struct device_attribute *attr, char *buf)
551{
552 if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
553 return sprintf(buf, "disabled & forbidden\n");
554 else if (dev->power.disable_depth)
555 return sprintf(buf, "disabled\n");
556 else if (dev->power.runtime_auto == false)
557 return sprintf(buf, "forbidden\n");
558 return sprintf(buf, "enabled\n");
559}
560
561static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
562static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
563static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
564
565#endif
566
567#ifdef CONFIG_PM_SLEEP
568
569static ssize_t async_show(struct device *dev, struct device_attribute *attr,
570 char *buf)
571{
572 return sprintf(buf, "%s\n",
573 device_async_suspend_enabled(dev) ? enabled : disabled);
574}
575
576static ssize_t async_store(struct device *dev, struct device_attribute *attr,
577 const char *buf, size_t n)
578{
579 char *cp;
580 int len = n;
581
582 cp = memchr(buf, '\n', n);
583 if (cp)
584 len = cp - buf;
585 if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
586 device_enable_async_suspend(dev);
587 else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
588 device_disable_async_suspend(dev);
589 else
590 return -EINVAL;
591 return n;
592}
593
594static DEVICE_ATTR(async, 0644, async_show, async_store);
595
596#endif
597#endif /* CONFIG_PM_ADVANCED_DEBUG */
598
599static struct attribute *power_attrs[] = {
600#ifdef CONFIG_PM_ADVANCED_DEBUG
601#ifdef CONFIG_PM_SLEEP
602 &dev_attr_async.attr,
603#endif
604#ifdef CONFIG_PM_RUNTIME
605 &dev_attr_runtime_status.attr,
606 &dev_attr_runtime_usage.attr,
607 &dev_attr_runtime_active_kids.attr,
608 &dev_attr_runtime_enabled.attr,
609#endif
610#endif /* CONFIG_PM_ADVANCED_DEBUG */
611 NULL,
612};
613static struct attribute_group pm_attr_group = {
614 .name = power_group_name,
615 .attrs = power_attrs,
616};
617
618static struct attribute *wakeup_attrs[] = {
619#ifdef CONFIG_PM_SLEEP
620 &dev_attr_wakeup.attr,
621 &dev_attr_wakeup_count.attr,
622 &dev_attr_wakeup_active_count.attr,
623 &dev_attr_wakeup_abort_count.attr,
624 &dev_attr_wakeup_expire_count.attr,
625 &dev_attr_wakeup_active.attr,
626 &dev_attr_wakeup_total_time_ms.attr,
627 &dev_attr_wakeup_max_time_ms.attr,
628 &dev_attr_wakeup_last_time_ms.attr,
629#ifdef CONFIG_PM_AUTOSLEEP
630 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
631#endif
632#endif
633 NULL,
634};
635static struct attribute_group pm_wakeup_attr_group = {
636 .name = power_group_name,
637 .attrs = wakeup_attrs,
638};
639
640static struct attribute *runtime_attrs[] = {
641#ifdef CONFIG_PM_RUNTIME
642#ifndef CONFIG_PM_ADVANCED_DEBUG
643 &dev_attr_runtime_status.attr,
644#endif
645 &dev_attr_control.attr,
646 &dev_attr_runtime_suspended_time.attr,
647 &dev_attr_runtime_active_time.attr,
648 &dev_attr_autosuspend_delay_ms.attr,
649#endif /* CONFIG_PM_RUNTIME */
650 NULL,
651};
652static struct attribute_group pm_runtime_attr_group = {
653 .name = power_group_name,
654 .attrs = runtime_attrs,
655};
656
657static struct attribute *pm_qos_resume_latency_attrs[] = {
658#ifdef CONFIG_PM_RUNTIME
659 &dev_attr_pm_qos_resume_latency_us.attr,
660#endif /* CONFIG_PM_RUNTIME */
661 NULL,
662};
663static struct attribute_group pm_qos_resume_latency_attr_group = {
664 .name = power_group_name,
665 .attrs = pm_qos_resume_latency_attrs,
666};
667
668static struct attribute *pm_qos_latency_tolerance_attrs[] = {
669#ifdef CONFIG_PM_RUNTIME
670 &dev_attr_pm_qos_latency_tolerance_us.attr,
671#endif /* CONFIG_PM_RUNTIME */
672 NULL,
673};
674static struct attribute_group pm_qos_latency_tolerance_attr_group = {
675 .name = power_group_name,
676 .attrs = pm_qos_latency_tolerance_attrs,
677};
678
679static struct attribute *pm_qos_flags_attrs[] = {
680#ifdef CONFIG_PM_RUNTIME
681 &dev_attr_pm_qos_no_power_off.attr,
682 &dev_attr_pm_qos_remote_wakeup.attr,
683#endif /* CONFIG_PM_RUNTIME */
684 NULL,
685};
686static struct attribute_group pm_qos_flags_attr_group = {
687 .name = power_group_name,
688 .attrs = pm_qos_flags_attrs,
689};
690
691int dpm_sysfs_add(struct device *dev)
692{
693 int rc;
694
695 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
696 if (rc)
697 return rc;
698
699 if (pm_runtime_callbacks_present(dev)) {
700 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
701 if (rc)
702 goto err_out;
703 }
704 if (device_can_wakeup(dev)) {
705 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
706 if (rc)
707 goto err_runtime;
708 }
709 if (dev->power.set_latency_tolerance) {
710 rc = sysfs_merge_group(&dev->kobj,
711 &pm_qos_latency_tolerance_attr_group);
712 if (rc)
713 goto err_wakeup;
714 }
715 return 0;
716
717 err_wakeup:
718 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
719 err_runtime:
720 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
721 err_out:
722 sysfs_remove_group(&dev->kobj, &pm_attr_group);
723 return rc;
724}
725
726int wakeup_sysfs_add(struct device *dev)
727{
728 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
729}
730
731void wakeup_sysfs_remove(struct device *dev)
732{
733 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
734}
735
736int pm_qos_sysfs_add_resume_latency(struct device *dev)
737{
738 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
739}
740
741void pm_qos_sysfs_remove_resume_latency(struct device *dev)
742{
743 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
744}
745
746int pm_qos_sysfs_add_flags(struct device *dev)
747{
748 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
749}
750
751void pm_qos_sysfs_remove_flags(struct device *dev)
752{
753 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
754}
755
756void rpm_sysfs_remove(struct device *dev)
757{
758 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
759}
760
761void dpm_sysfs_remove(struct device *dev)
762{
763 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
764 dev_pm_qos_constraints_destroy(dev);
765 rpm_sysfs_remove(dev);
766 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
767 sysfs_remove_group(&dev->kobj, &pm_attr_group);
768}
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 sysfs_emit(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,
126 char *buf)
127{
128 u64 tmp = pm_runtime_active_time(dev);
129
130 do_div(tmp, NSEC_PER_MSEC);
131
132 return sysfs_emit(buf, "%llu\n", tmp);
133}
134
135static DEVICE_ATTR_RO(runtime_active_time);
136
137static ssize_t runtime_suspended_time_show(struct device *dev,
138 struct device_attribute *attr,
139 char *buf)
140{
141 u64 tmp = pm_runtime_suspended_time(dev);
142
143 do_div(tmp, NSEC_PER_MSEC);
144
145 return sysfs_emit(buf, "%llu\n", tmp);
146}
147
148static DEVICE_ATTR_RO(runtime_suspended_time);
149
150static ssize_t runtime_status_show(struct device *dev,
151 struct device_attribute *attr, char *buf)
152{
153 const char *output;
154
155 if (dev->power.runtime_error) {
156 output = "error";
157 } else if (dev->power.disable_depth) {
158 output = "unsupported";
159 } else {
160 switch (dev->power.runtime_status) {
161 case RPM_SUSPENDED:
162 output = "suspended";
163 break;
164 case RPM_SUSPENDING:
165 output = "suspending";
166 break;
167 case RPM_RESUMING:
168 output = "resuming";
169 break;
170 case RPM_ACTIVE:
171 output = "active";
172 break;
173 default:
174 return -EIO;
175 }
176 }
177 return sysfs_emit(buf, "%s\n", output);
178}
179
180static DEVICE_ATTR_RO(runtime_status);
181
182static ssize_t autosuspend_delay_ms_show(struct device *dev,
183 struct device_attribute *attr,
184 char *buf)
185{
186 if (!dev->power.use_autosuspend)
187 return -EIO;
188
189 return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay);
190}
191
192static ssize_t autosuspend_delay_ms_store(struct device *dev,
193 struct device_attribute *attr, const char *buf, size_t n)
194{
195 long delay;
196
197 if (!dev->power.use_autosuspend)
198 return -EIO;
199
200 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
201 return -EINVAL;
202
203 device_lock(dev);
204 pm_runtime_set_autosuspend_delay(dev, delay);
205 device_unlock(dev);
206 return n;
207}
208
209static DEVICE_ATTR_RW(autosuspend_delay_ms);
210
211static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
212 struct device_attribute *attr,
213 char *buf)
214{
215 s32 value = dev_pm_qos_requested_resume_latency(dev);
216
217 if (value == 0)
218 return sysfs_emit(buf, "n/a\n");
219 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
220 value = 0;
221
222 return sysfs_emit(buf, "%d\n", value);
223}
224
225static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
226 struct device_attribute *attr,
227 const char *buf, size_t n)
228{
229 s32 value;
230 int ret;
231
232 if (!kstrtos32(buf, 0, &value)) {
233 /*
234 * Prevent users from writing negative or "no constraint" values
235 * directly.
236 */
237 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
238 return -EINVAL;
239
240 if (value == 0)
241 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
242 } else if (sysfs_streq(buf, "n/a")) {
243 value = 0;
244 } else {
245 return -EINVAL;
246 }
247
248 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
249 value);
250 return ret < 0 ? ret : n;
251}
252
253static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
254
255static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
256 struct device_attribute *attr,
257 char *buf)
258{
259 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
260
261 if (value < 0)
262 return sysfs_emit(buf, "%s\n", "auto");
263 if (value == PM_QOS_LATENCY_ANY)
264 return sysfs_emit(buf, "%s\n", "any");
265
266 return sysfs_emit(buf, "%d\n", value);
267}
268
269static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
270 struct device_attribute *attr,
271 const char *buf, size_t n)
272{
273 s32 value;
274 int ret;
275
276 if (kstrtos32(buf, 0, &value) == 0) {
277 /* Users can't write negative values directly */
278 if (value < 0)
279 return -EINVAL;
280 } else {
281 if (sysfs_streq(buf, "auto"))
282 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
283 else if (sysfs_streq(buf, "any"))
284 value = PM_QOS_LATENCY_ANY;
285 else
286 return -EINVAL;
287 }
288 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
289 return ret < 0 ? ret : n;
290}
291
292static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
293
294static ssize_t pm_qos_no_power_off_show(struct device *dev,
295 struct device_attribute *attr,
296 char *buf)
297{
298 return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
299 & PM_QOS_FLAG_NO_POWER_OFF));
300}
301
302static ssize_t pm_qos_no_power_off_store(struct device *dev,
303 struct device_attribute *attr,
304 const char *buf, size_t n)
305{
306 int ret;
307
308 if (kstrtoint(buf, 0, &ret))
309 return -EINVAL;
310
311 if (ret != 0 && ret != 1)
312 return -EINVAL;
313
314 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
315 return ret < 0 ? ret : n;
316}
317
318static DEVICE_ATTR_RW(pm_qos_no_power_off);
319
320#ifdef CONFIG_PM_SLEEP
321static const char _enabled[] = "enabled";
322static const char _disabled[] = "disabled";
323
324static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
325 char *buf)
326{
327 return sysfs_emit(buf, "%s\n", device_can_wakeup(dev)
328 ? (device_may_wakeup(dev) ? _enabled : _disabled)
329 : "");
330}
331
332static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
333 const char *buf, size_t n)
334{
335 if (!device_can_wakeup(dev))
336 return -EINVAL;
337
338 if (sysfs_streq(buf, _enabled))
339 device_set_wakeup_enable(dev, 1);
340 else if (sysfs_streq(buf, _disabled))
341 device_set_wakeup_enable(dev, 0);
342 else
343 return -EINVAL;
344 return n;
345}
346
347static DEVICE_ATTR_RW(wakeup);
348
349static ssize_t wakeup_count_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
351{
352 unsigned long count;
353 bool enabled = false;
354
355 spin_lock_irq(&dev->power.lock);
356 if (dev->power.wakeup) {
357 count = dev->power.wakeup->wakeup_count;
358 enabled = true;
359 }
360 spin_unlock_irq(&dev->power.lock);
361
362 if (!enabled)
363 return sysfs_emit(buf, "\n");
364 return sysfs_emit(buf, "%lu\n", count);
365}
366
367static DEVICE_ATTR_RO(wakeup_count);
368
369static ssize_t wakeup_active_count_show(struct device *dev,
370 struct device_attribute *attr,
371 char *buf)
372{
373 unsigned long count;
374 bool enabled = false;
375
376 spin_lock_irq(&dev->power.lock);
377 if (dev->power.wakeup) {
378 count = dev->power.wakeup->active_count;
379 enabled = true;
380 }
381 spin_unlock_irq(&dev->power.lock);
382
383 if (!enabled)
384 return sysfs_emit(buf, "\n");
385 return sysfs_emit(buf, "%lu\n", count);
386}
387
388static DEVICE_ATTR_RO(wakeup_active_count);
389
390static ssize_t wakeup_abort_count_show(struct device *dev,
391 struct device_attribute *attr,
392 char *buf)
393{
394 unsigned long count;
395 bool enabled = false;
396
397 spin_lock_irq(&dev->power.lock);
398 if (dev->power.wakeup) {
399 count = dev->power.wakeup->wakeup_count;
400 enabled = true;
401 }
402 spin_unlock_irq(&dev->power.lock);
403
404 if (!enabled)
405 return sysfs_emit(buf, "\n");
406 return sysfs_emit(buf, "%lu\n", count);
407}
408
409static DEVICE_ATTR_RO(wakeup_abort_count);
410
411static ssize_t wakeup_expire_count_show(struct device *dev,
412 struct device_attribute *attr,
413 char *buf)
414{
415 unsigned long count;
416 bool enabled = false;
417
418 spin_lock_irq(&dev->power.lock);
419 if (dev->power.wakeup) {
420 count = dev->power.wakeup->expire_count;
421 enabled = true;
422 }
423 spin_unlock_irq(&dev->power.lock);
424
425 if (!enabled)
426 return sysfs_emit(buf, "\n");
427 return sysfs_emit(buf, "%lu\n", count);
428}
429
430static DEVICE_ATTR_RO(wakeup_expire_count);
431
432static ssize_t wakeup_active_show(struct device *dev,
433 struct device_attribute *attr, char *buf)
434{
435 unsigned int active;
436 bool enabled = false;
437
438 spin_lock_irq(&dev->power.lock);
439 if (dev->power.wakeup) {
440 active = dev->power.wakeup->active;
441 enabled = true;
442 }
443 spin_unlock_irq(&dev->power.lock);
444
445 if (!enabled)
446 return sysfs_emit(buf, "\n");
447 return sysfs_emit(buf, "%u\n", active);
448}
449
450static DEVICE_ATTR_RO(wakeup_active);
451
452static ssize_t wakeup_total_time_ms_show(struct device *dev,
453 struct device_attribute *attr,
454 char *buf)
455{
456 s64 msec;
457 bool enabled = false;
458
459 spin_lock_irq(&dev->power.lock);
460 if (dev->power.wakeup) {
461 msec = ktime_to_ms(dev->power.wakeup->total_time);
462 enabled = true;
463 }
464 spin_unlock_irq(&dev->power.lock);
465
466 if (!enabled)
467 return sysfs_emit(buf, "\n");
468 return sysfs_emit(buf, "%lld\n", msec);
469}
470
471static DEVICE_ATTR_RO(wakeup_total_time_ms);
472
473static ssize_t wakeup_max_time_ms_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
476 s64 msec;
477 bool enabled = false;
478
479 spin_lock_irq(&dev->power.lock);
480 if (dev->power.wakeup) {
481 msec = ktime_to_ms(dev->power.wakeup->max_time);
482 enabled = true;
483 }
484 spin_unlock_irq(&dev->power.lock);
485
486 if (!enabled)
487 return sysfs_emit(buf, "\n");
488 return sysfs_emit(buf, "%lld\n", msec);
489}
490
491static DEVICE_ATTR_RO(wakeup_max_time_ms);
492
493static ssize_t wakeup_last_time_ms_show(struct device *dev,
494 struct device_attribute *attr,
495 char *buf)
496{
497 s64 msec;
498 bool enabled = false;
499
500 spin_lock_irq(&dev->power.lock);
501 if (dev->power.wakeup) {
502 msec = ktime_to_ms(dev->power.wakeup->last_time);
503 enabled = true;
504 }
505 spin_unlock_irq(&dev->power.lock);
506
507 if (!enabled)
508 return sysfs_emit(buf, "\n");
509 return sysfs_emit(buf, "%lld\n", msec);
510}
511
512static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
513 kgid_t kgid)
514{
515 if (dev->power.wakeup && dev->power.wakeup->dev)
516 return device_change_owner(dev->power.wakeup->dev, kuid, kgid);
517 return 0;
518}
519
520static DEVICE_ATTR_RO(wakeup_last_time_ms);
521
522#ifdef CONFIG_PM_AUTOSLEEP
523static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
524 struct device_attribute *attr,
525 char *buf)
526{
527 s64 msec;
528 bool enabled = false;
529
530 spin_lock_irq(&dev->power.lock);
531 if (dev->power.wakeup) {
532 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
533 enabled = true;
534 }
535 spin_unlock_irq(&dev->power.lock);
536
537 if (!enabled)
538 return sysfs_emit(buf, "\n");
539 return sysfs_emit(buf, "%lld\n", msec);
540}
541
542static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
543#endif /* CONFIG_PM_AUTOSLEEP */
544#else /* CONFIG_PM_SLEEP */
545static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
546 kgid_t kgid)
547{
548 return 0;
549}
550#endif
551
552#ifdef CONFIG_PM_ADVANCED_DEBUG
553static ssize_t runtime_usage_show(struct device *dev,
554 struct device_attribute *attr, char *buf)
555{
556 return sysfs_emit(buf, "%d\n", atomic_read(&dev->power.usage_count));
557}
558static DEVICE_ATTR_RO(runtime_usage);
559
560static ssize_t runtime_active_kids_show(struct device *dev,
561 struct device_attribute *attr,
562 char *buf)
563{
564 return sysfs_emit(buf, "%d\n", dev->power.ignore_children ?
565 0 : atomic_read(&dev->power.child_count));
566}
567static DEVICE_ATTR_RO(runtime_active_kids);
568
569static ssize_t runtime_enabled_show(struct device *dev,
570 struct device_attribute *attr, char *buf)
571{
572 const char *output;
573
574 if (dev->power.disable_depth && !dev->power.runtime_auto)
575 output = "disabled & forbidden";
576 else if (dev->power.disable_depth)
577 output = "disabled";
578 else if (!dev->power.runtime_auto)
579 output = "forbidden";
580 else
581 output = "enabled";
582
583 return sysfs_emit(buf, "%s\n", output);
584}
585static DEVICE_ATTR_RO(runtime_enabled);
586
587#ifdef CONFIG_PM_SLEEP
588static ssize_t async_show(struct device *dev, struct device_attribute *attr,
589 char *buf)
590{
591 return sysfs_emit(buf, "%s\n",
592 device_async_suspend_enabled(dev) ?
593 _enabled : _disabled);
594}
595
596static ssize_t async_store(struct device *dev, struct device_attribute *attr,
597 const char *buf, size_t n)
598{
599 if (sysfs_streq(buf, _enabled))
600 device_enable_async_suspend(dev);
601 else if (sysfs_streq(buf, _disabled))
602 device_disable_async_suspend(dev);
603 else
604 return -EINVAL;
605 return n;
606}
607
608static DEVICE_ATTR_RW(async);
609
610#endif /* CONFIG_PM_SLEEP */
611#endif /* CONFIG_PM_ADVANCED_DEBUG */
612
613static struct attribute *power_attrs[] = {
614#ifdef CONFIG_PM_ADVANCED_DEBUG
615#ifdef CONFIG_PM_SLEEP
616 &dev_attr_async.attr,
617#endif
618 &dev_attr_runtime_status.attr,
619 &dev_attr_runtime_usage.attr,
620 &dev_attr_runtime_active_kids.attr,
621 &dev_attr_runtime_enabled.attr,
622#endif /* CONFIG_PM_ADVANCED_DEBUG */
623 NULL,
624};
625static const struct attribute_group pm_attr_group = {
626 .name = power_group_name,
627 .attrs = power_attrs,
628};
629
630static struct attribute *wakeup_attrs[] = {
631#ifdef CONFIG_PM_SLEEP
632 &dev_attr_wakeup.attr,
633 &dev_attr_wakeup_count.attr,
634 &dev_attr_wakeup_active_count.attr,
635 &dev_attr_wakeup_abort_count.attr,
636 &dev_attr_wakeup_expire_count.attr,
637 &dev_attr_wakeup_active.attr,
638 &dev_attr_wakeup_total_time_ms.attr,
639 &dev_attr_wakeup_max_time_ms.attr,
640 &dev_attr_wakeup_last_time_ms.attr,
641#ifdef CONFIG_PM_AUTOSLEEP
642 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
643#endif
644#endif
645 NULL,
646};
647static const struct attribute_group pm_wakeup_attr_group = {
648 .name = power_group_name,
649 .attrs = wakeup_attrs,
650};
651
652static struct attribute *runtime_attrs[] = {
653#ifndef CONFIG_PM_ADVANCED_DEBUG
654 &dev_attr_runtime_status.attr,
655#endif
656 &dev_attr_control.attr,
657 &dev_attr_runtime_suspended_time.attr,
658 &dev_attr_runtime_active_time.attr,
659 &dev_attr_autosuspend_delay_ms.attr,
660 NULL,
661};
662static const struct attribute_group pm_runtime_attr_group = {
663 .name = power_group_name,
664 .attrs = runtime_attrs,
665};
666
667static struct attribute *pm_qos_resume_latency_attrs[] = {
668 &dev_attr_pm_qos_resume_latency_us.attr,
669 NULL,
670};
671static const struct attribute_group pm_qos_resume_latency_attr_group = {
672 .name = power_group_name,
673 .attrs = pm_qos_resume_latency_attrs,
674};
675
676static struct attribute *pm_qos_latency_tolerance_attrs[] = {
677 &dev_attr_pm_qos_latency_tolerance_us.attr,
678 NULL,
679};
680static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
681 .name = power_group_name,
682 .attrs = pm_qos_latency_tolerance_attrs,
683};
684
685static struct attribute *pm_qos_flags_attrs[] = {
686 &dev_attr_pm_qos_no_power_off.attr,
687 NULL,
688};
689static const struct attribute_group pm_qos_flags_attr_group = {
690 .name = power_group_name,
691 .attrs = pm_qos_flags_attrs,
692};
693
694int dpm_sysfs_add(struct device *dev)
695{
696 int rc;
697
698 /* No need to create PM sysfs if explicitly disabled. */
699 if (device_pm_not_required(dev))
700 return 0;
701
702 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
703 if (rc)
704 return rc;
705
706 if (!pm_runtime_has_no_callbacks(dev)) {
707 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
708 if (rc)
709 goto err_out;
710 }
711 if (device_can_wakeup(dev)) {
712 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
713 if (rc)
714 goto err_runtime;
715 }
716 if (dev->power.set_latency_tolerance) {
717 rc = sysfs_merge_group(&dev->kobj,
718 &pm_qos_latency_tolerance_attr_group);
719 if (rc)
720 goto err_wakeup;
721 }
722 rc = pm_wakeup_source_sysfs_add(dev);
723 if (rc)
724 goto err_latency;
725 return 0;
726
727 err_latency:
728 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
729 err_wakeup:
730 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
731 err_runtime:
732 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
733 err_out:
734 sysfs_remove_group(&dev->kobj, &pm_attr_group);
735 return rc;
736}
737
738int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
739{
740 int rc;
741
742 if (device_pm_not_required(dev))
743 return 0;
744
745 rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid);
746 if (rc)
747 return rc;
748
749 if (!pm_runtime_has_no_callbacks(dev)) {
750 rc = sysfs_group_change_owner(
751 &dev->kobj, &pm_runtime_attr_group, kuid, kgid);
752 if (rc)
753 return rc;
754 }
755
756 if (device_can_wakeup(dev)) {
757 rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group,
758 kuid, kgid);
759 if (rc)
760 return rc;
761
762 rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid);
763 if (rc)
764 return rc;
765 }
766
767 if (dev->power.set_latency_tolerance) {
768 rc = sysfs_group_change_owner(
769 &dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid,
770 kgid);
771 if (rc)
772 return rc;
773 }
774 return 0;
775}
776
777int wakeup_sysfs_add(struct device *dev)
778{
779 int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
780
781 if (!ret)
782 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
783
784 return ret;
785}
786
787void wakeup_sysfs_remove(struct device *dev)
788{
789 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
790 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
791}
792
793int pm_qos_sysfs_add_resume_latency(struct device *dev)
794{
795 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
796}
797
798void pm_qos_sysfs_remove_resume_latency(struct device *dev)
799{
800 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
801}
802
803int pm_qos_sysfs_add_flags(struct device *dev)
804{
805 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
806}
807
808void pm_qos_sysfs_remove_flags(struct device *dev)
809{
810 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
811}
812
813int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
814{
815 return sysfs_merge_group(&dev->kobj,
816 &pm_qos_latency_tolerance_attr_group);
817}
818
819void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
820{
821 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
822}
823
824void rpm_sysfs_remove(struct device *dev)
825{
826 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
827}
828
829void dpm_sysfs_remove(struct device *dev)
830{
831 if (device_pm_not_required(dev))
832 return;
833 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
834 dev_pm_qos_constraints_destroy(dev);
835 rpm_sysfs_remove(dev);
836 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
837 sysfs_remove_group(&dev->kobj, &pm_attr_group);
838}