FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / base / power / sysfs.c
blobfff49bee781d44f4fd2f35dda22f86a388fd9259
1 /*
2 * drivers/base/power/sysfs.c - sysfs entries for device PM
3 */
5 #include <linux/device.h>
6 #include <linux/string.h>
7 #include <linux/pm_runtime.h>
8 #include <asm/atomic.h>
9 #include <linux/jiffies.h>
10 #include "power.h"
13 * control - Report/change current runtime PM setting of the device
15 * Runtime power management of a device can be blocked with the help of
16 * this attribute. All devices have one of the following two values for
17 * the power/control file:
19 * + "auto\n" to allow the device to be power managed at run time;
20 * + "on\n" to prevent the device from being power managed at run time;
22 * The default for all devices is "auto", which means that devices may be
23 * subject to automatic power management, depending on their drivers.
24 * Changing this attribute to "on" prevents the driver from power managing
25 * the device at run time. Doing that while the device is suspended causes
26 * it to be woken up.
28 * wakeup - Report/change current wakeup option for device
30 * Some devices support "wakeup" events, which are hardware signals
31 * used to activate devices from suspended or low power states. Such
32 * devices have one of three values for the sysfs power/wakeup file:
34 * + "enabled\n" to issue the events;
35 * + "disabled\n" not to do so; or
36 * + "\n" for temporary or permanent inability to issue wakeup.
38 * (For example, unconfigured USB devices can't issue wakeups.)
40 * Familiar examples of devices that can issue wakeup events include
41 * keyboards and mice (both PS2 and USB styles), power buttons, modems,
42 * "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
43 * will wake the entire system from a suspend state; others may just
44 * wake up the device (if the system as a whole is already active).
45 * Some wakeup events use normal IRQ lines; other use special out
46 * of band signaling.
48 * It is the responsibility of device drivers to enable (or disable)
49 * wakeup signaling as part of changing device power states, respecting
50 * the policy choices provided through the driver model.
52 * Devices may not be able to generate wakeup events from all power
53 * states. Also, the events may be ignored in some configurations;
54 * for example, they might need help from other devices that aren't
55 * active, or which may have wakeup disabled. Some drivers rely on
56 * wakeup events internally (unless they are disabled), keeping
57 * their hardware in low power modes whenever they're unused. This
58 * saves runtime power, without requiring system-wide sleep states.
60 * async - Report/change current async suspend setting for the device
62 * Asynchronous suspend and resume of the device during system-wide power
63 * state transitions can be enabled by writing "enabled" to this file.
64 * Analogously, if "disabled" is written to this file, the device will be
65 * suspended and resumed synchronously.
67 * All devices have one of the following two values for power/async:
69 * + "enabled\n" to permit the asynchronous suspend/resume of the device;
70 * + "disabled\n" to forbid it;
72 * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
73 * of a device unless it is certain that all of the PM dependencies of the
74 * device are known to the PM core. However, for some devices this
75 * attribute is set to "enabled" by bus type code or device drivers and in
76 * that cases it should be safe to leave the default value.
78 * autosuspend_delay_ms - Report/change a device's autosuspend_delay value
80 * Some drivers don't want to carry out a runtime suspend as soon as a
81 * device becomes idle; they want it always to remain idle for some period
82 * of time before suspending it. This period is the autosuspend_delay
83 * value (expressed in milliseconds) and it can be controlled by the user.
84 * If the value is negative then the device will never be runtime
85 * suspended.
87 * NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
88 * value are used only if the driver calls pm_runtime_use_autosuspend().
90 * wakeup_count - Report the number of wakeup events related to the device
93 static const char enabled[] = "enabled";
94 static const char disabled[] = "disabled";
96 const char power_group_name[] = "power";
97 EXPORT_SYMBOL_GPL(power_group_name);
99 #ifdef CONFIG_PM_RUNTIME
100 static const char ctrl_auto[] = "auto";
101 static const char ctrl_on[] = "on";
103 static ssize_t control_show(struct device *dev, struct device_attribute *attr,
104 char *buf)
106 return sprintf(buf, "%s\n",
107 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
110 static ssize_t control_store(struct device * dev, struct device_attribute *attr,
111 const char * buf, size_t n)
113 char *cp;
114 int len = n;
116 cp = memchr(buf, '\n', n);
117 if (cp)
118 len = cp - buf;
119 if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
120 pm_runtime_allow(dev);
121 else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
122 pm_runtime_forbid(dev);
123 else
124 return -EINVAL;
125 return n;
128 static DEVICE_ATTR(control, 0644, control_show, control_store);
130 static ssize_t rtpm_active_time_show(struct device *dev,
131 struct device_attribute *attr, char *buf)
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;
141 static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
143 static ssize_t rtpm_suspended_time_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
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;
155 static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
157 static ssize_t rtpm_status_show(struct device *dev,
158 struct device_attribute *attr, char *buf)
160 const char *p;
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;
184 return sprintf(buf, p);
187 static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
189 static ssize_t autosuspend_delay_ms_show(struct device *dev,
190 struct device_attribute *attr, char *buf)
192 if (!dev->power.use_autosuspend)
193 return -EIO;
194 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
197 static ssize_t autosuspend_delay_ms_store(struct device *dev,
198 struct device_attribute *attr, const char *buf, size_t n)
200 long delay;
202 if (!dev->power.use_autosuspend)
203 return -EIO;
205 if (strict_strtol(buf, 10, &delay) != 0 || delay != (int) delay)
206 return -EINVAL;
208 pm_runtime_set_autosuspend_delay(dev, delay);
209 return n;
212 static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
213 autosuspend_delay_ms_store);
215 #endif
217 static ssize_t
218 wake_show(struct device * dev, struct device_attribute *attr, char * buf)
220 return sprintf(buf, "%s\n", device_can_wakeup(dev)
221 ? (device_may_wakeup(dev) ? enabled : disabled)
222 : "");
225 static ssize_t
226 wake_store(struct device * dev, struct device_attribute *attr,
227 const char * buf, size_t n)
229 char *cp;
230 int len = n;
232 if (!device_can_wakeup(dev))
233 return -EINVAL;
235 cp = memchr(buf, '\n', n);
236 if (cp)
237 len = cp - buf;
238 if (len == sizeof enabled - 1
239 && strncmp(buf, enabled, sizeof enabled - 1) == 0)
240 device_set_wakeup_enable(dev, 1);
241 else if (len == sizeof disabled - 1
242 && strncmp(buf, disabled, sizeof disabled - 1) == 0)
243 device_set_wakeup_enable(dev, 0);
244 else
245 return -EINVAL;
246 return n;
249 static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
251 #ifdef CONFIG_PM_SLEEP
252 static ssize_t wakeup_count_show(struct device *dev,
253 struct device_attribute *attr, char *buf)
255 unsigned long count = 0;
256 bool enabled = false;
258 spin_lock_irq(&dev->power.lock);
259 if (dev->power.wakeup) {
260 count = dev->power.wakeup->event_count;
261 enabled = true;
263 spin_unlock_irq(&dev->power.lock);
264 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
267 static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
269 static ssize_t wakeup_active_count_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
272 unsigned long count = 0;
273 bool enabled = false;
275 spin_lock_irq(&dev->power.lock);
276 if (dev->power.wakeup) {
277 count = dev->power.wakeup->active_count;
278 enabled = true;
280 spin_unlock_irq(&dev->power.lock);
281 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
284 static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
286 static ssize_t wakeup_hit_count_show(struct device *dev,
287 struct device_attribute *attr, char *buf)
289 unsigned long count = 0;
290 bool enabled = false;
292 spin_lock_irq(&dev->power.lock);
293 if (dev->power.wakeup) {
294 count = dev->power.wakeup->hit_count;
295 enabled = true;
297 spin_unlock_irq(&dev->power.lock);
298 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
301 static DEVICE_ATTR(wakeup_hit_count, 0444, wakeup_hit_count_show, NULL);
303 static ssize_t wakeup_active_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
306 unsigned int active = 0;
307 bool enabled = false;
309 spin_lock_irq(&dev->power.lock);
310 if (dev->power.wakeup) {
311 active = dev->power.wakeup->active;
312 enabled = true;
314 spin_unlock_irq(&dev->power.lock);
315 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
318 static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
320 static ssize_t wakeup_total_time_show(struct device *dev,
321 struct device_attribute *attr, char *buf)
323 s64 msec = 0;
324 bool enabled = false;
326 spin_lock_irq(&dev->power.lock);
327 if (dev->power.wakeup) {
328 msec = ktime_to_ms(dev->power.wakeup->total_time);
329 enabled = true;
331 spin_unlock_irq(&dev->power.lock);
332 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
335 static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
337 static ssize_t wakeup_max_time_show(struct device *dev,
338 struct device_attribute *attr, char *buf)
340 s64 msec = 0;
341 bool enabled = false;
343 spin_lock_irq(&dev->power.lock);
344 if (dev->power.wakeup) {
345 msec = ktime_to_ms(dev->power.wakeup->max_time);
346 enabled = true;
348 spin_unlock_irq(&dev->power.lock);
349 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
352 static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
354 static ssize_t wakeup_last_time_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
357 s64 msec = 0;
358 bool enabled = false;
360 spin_lock_irq(&dev->power.lock);
361 if (dev->power.wakeup) {
362 msec = ktime_to_ms(dev->power.wakeup->last_time);
363 enabled = true;
365 spin_unlock_irq(&dev->power.lock);
366 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
369 static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
370 #endif /* CONFIG_PM_SLEEP */
372 #ifdef CONFIG_PM_ADVANCED_DEBUG
373 #ifdef CONFIG_PM_RUNTIME
375 static ssize_t rtpm_usagecount_show(struct device *dev,
376 struct device_attribute *attr, char *buf)
378 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
381 static ssize_t rtpm_children_show(struct device *dev,
382 struct device_attribute *attr, char *buf)
384 return sprintf(buf, "%d\n", dev->power.ignore_children ?
385 0 : atomic_read(&dev->power.child_count));
388 static ssize_t rtpm_enabled_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
391 if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
392 return sprintf(buf, "disabled & forbidden\n");
393 else if (dev->power.disable_depth)
394 return sprintf(buf, "disabled\n");
395 else if (dev->power.runtime_auto == false)
396 return sprintf(buf, "forbidden\n");
397 return sprintf(buf, "enabled\n");
400 static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
401 static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
402 static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
404 #endif
406 static ssize_t async_show(struct device *dev, struct device_attribute *attr,
407 char *buf)
409 return sprintf(buf, "%s\n",
410 device_async_suspend_enabled(dev) ? enabled : disabled);
413 static ssize_t async_store(struct device *dev, struct device_attribute *attr,
414 const char *buf, size_t n)
416 char *cp;
417 int len = n;
419 cp = memchr(buf, '\n', n);
420 if (cp)
421 len = cp - buf;
422 if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
423 device_enable_async_suspend(dev);
424 else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
425 device_disable_async_suspend(dev);
426 else
427 return -EINVAL;
428 return n;
431 static DEVICE_ATTR(async, 0644, async_show, async_store);
432 #endif /* CONFIG_PM_ADVANCED_DEBUG */
434 static struct attribute *power_attrs[] = {
435 #ifdef CONFIG_PM_ADVANCED_DEBUG
436 #ifdef CONFIG_PM_SLEEP
437 &dev_attr_async.attr,
438 #endif
439 #ifdef CONFIG_PM_RUNTIME
440 &dev_attr_runtime_status.attr,
441 &dev_attr_runtime_usage.attr,
442 &dev_attr_runtime_active_kids.attr,
443 &dev_attr_runtime_enabled.attr,
444 #endif
445 #endif /* CONFIG_PM_ADVANCED_DEBUG */
446 NULL,
448 static struct attribute_group pm_attr_group = {
449 .name = power_group_name,
450 .attrs = power_attrs,
453 static struct attribute *wakeup_attrs[] = {
454 #ifdef CONFIG_PM_SLEEP
455 &dev_attr_wakeup.attr,
456 &dev_attr_wakeup_count.attr,
457 &dev_attr_wakeup_active_count.attr,
458 &dev_attr_wakeup_hit_count.attr,
459 &dev_attr_wakeup_active.attr,
460 &dev_attr_wakeup_total_time_ms.attr,
461 &dev_attr_wakeup_max_time_ms.attr,
462 &dev_attr_wakeup_last_time_ms.attr,
463 #endif
464 NULL,
466 static struct attribute_group pm_wakeup_attr_group = {
467 .name = power_group_name,
468 .attrs = wakeup_attrs,
471 static struct attribute *runtime_attrs[] = {
472 #ifdef CONFIG_PM_RUNTIME
473 #ifndef CONFIG_PM_ADVANCED_DEBUG
474 &dev_attr_runtime_status.attr,
475 #endif
476 &dev_attr_control.attr,
477 &dev_attr_runtime_suspended_time.attr,
478 &dev_attr_runtime_active_time.attr,
479 &dev_attr_autosuspend_delay_ms.attr,
480 #endif /* CONFIG_PM_RUNTIME */
481 NULL,
483 static struct attribute_group pm_runtime_attr_group = {
484 .name = power_group_name,
485 .attrs = runtime_attrs,
488 int dpm_sysfs_add(struct device *dev)
490 int rc;
492 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
493 if (rc)
494 return rc;
496 if (pm_runtime_callbacks_present(dev)) {
497 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
498 if (rc)
499 goto err_out;
502 if (device_can_wakeup(dev)) {
503 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
504 if (rc) {
505 if (pm_runtime_callbacks_present(dev))
506 sysfs_unmerge_group(&dev->kobj,
507 &pm_runtime_attr_group);
508 goto err_out;
511 return 0;
513 err_out:
514 sysfs_remove_group(&dev->kobj, &pm_attr_group);
515 return rc;
518 int wakeup_sysfs_add(struct device *dev)
520 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
523 void wakeup_sysfs_remove(struct device *dev)
525 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
528 void rpm_sysfs_remove(struct device *dev)
530 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
533 void dpm_sysfs_remove(struct device *dev)
535 rpm_sysfs_remove(dev);
536 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
537 sysfs_remove_group(&dev->kobj, &pm_attr_group);