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