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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
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}
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}