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