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