[deliverable/linux.git] / drivers / base / power / sysfs.c

/*
 * drivers/base/power/sysfs.c - sysfs entries for device PM
 */

#include <linux/device.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
#include "power.h"

/*
 *	control - Report/change current runtime PM setting of the device
 *
 *	Runtime power management of a device can be blocked with the help of
 *	this attribute.  All devices have one of the following two values for
 *	the power/control file:
 *
 *	 + "auto\n" to allow the device to be power managed at run time;
 *	 + "on\n" to prevent the device from being power managed at run time;
 *
 *	The default for all devices is "auto", which means that devices may be
 *	subject to automatic power management, depending on their drivers.
 *	Changing this attribute to "on" prevents the driver from power managing
 *	the device at run time.  Doing that while the device is suspended causes
 *	it to be woken up.
 *
 *	wakeup - Report/change current wakeup option for device
 *
 *	Some devices support "wakeup" events, which are hardware signals
 *	used to activate devices from suspended or low power states.  Such
 *	devices have one of three values for the sysfs power/wakeup file:
 *
 *	 + "enabled\n" to issue the events;
 *	 + "disabled\n" not to do so; or
 *	 + "\n" for temporary or permanent inability to issue wakeup.
 *
 *	(For example, unconfigured USB devices can't issue wakeups.)
 *
 *	Familiar examples of devices that can issue wakeup events include
 *	keyboards and mice (both PS2 and USB styles), power buttons, modems,
 *	"Wake-On-LAN" Ethernet links, GPIO lines, and more.  Some events
 *	will wake the entire system from a suspend state; others may just
 *	wake up the device (if the system as a whole is already active).
 *	Some wakeup events use normal IRQ lines; other use special out
 *	of band signaling.
 *
 *	It is the responsibility of device drivers to enable (or disable)
 *	wakeup signaling as part of changing device power states, respecting
 *	the policy choices provided through the driver model.
 *
 *	Devices may not be able to generate wakeup events from all power
 *	states.  Also, the events may be ignored in some configurations;
 *	for example, they might need help from other devices that aren't
 *	active, or which may have wakeup disabled.  Some drivers rely on
 *	wakeup events internally (unless they are disabled), keeping
 *	their hardware in low power modes whenever they're unused.  This
 *	saves runtime power, without requiring system-wide sleep states.
 *
 *	async - Report/change current async suspend setting for the device
 *
 *	Asynchronous suspend and resume of the device during system-wide power
 *	state transitions can be enabled by writing "enabled" to this file.
 *	Analogously, if "disabled" is written to this file, the device will be
 *	suspended and resumed synchronously.
 *
 *	All devices have one of the following two values for power/async:
 *
 *	 + "enabled\n" to permit the asynchronous suspend/resume of the device;
 *	 + "disabled\n" to forbid it;
 *
 *	NOTE: It generally is unsafe to permit the asynchronous suspend/resume
 *	of a device unless it is certain that all of the PM dependencies of the
 *	device are known to the PM core.  However, for some devices this
 *	attribute is set to "enabled" by bus type code or device drivers and in
 *	that cases it should be safe to leave the default value.
 *
 *	autosuspend_delay_ms - Report/change a device's autosuspend_delay value
 *
 *	Some drivers don't want to carry out a runtime suspend as soon as a
 *	device becomes idle; they want it always to remain idle for some period
 *	of time before suspending it.  This period is the autosuspend_delay
 *	value (expressed in milliseconds) and it can be controlled by the user.
 *	If the value is negative then the device will never be runtime
 *	suspended.
 *
 *	NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
 *	value are used only if the driver calls pm_runtime_use_autosuspend().
 *
 *	wakeup_count - Report the number of wakeup events related to the device
 */

static const char enabled[] = "enabled";
static const char disabled[] = "disabled";

const char power_group_name[] = "power";
EXPORT_SYMBOL_GPL(power_group_name);

#ifdef CONFIG_PM_RUNTIME
static const char ctrl_auto[] = "auto";
static const char ctrl_on[] = "on";

static ssize_t control_show(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "%s\n",
				dev->power.runtime_auto ? ctrl_auto : ctrl_on);
}

static ssize_t control_store(struct device * dev, struct device_attribute *attr,
			     const char * buf, size_t n)
{
	char *cp;
	int len = n;

	cp = memchr(buf, '\n', n);
	if (cp)
		len = cp - buf;
	device_lock(dev);
	if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
		pm_runtime_allow(dev);
	else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
		pm_runtime_forbid(dev);
	else
		n = -EINVAL;
	device_unlock(dev);
	return n;
}

static DEVICE_ATTR(control, 0644, control_show, control_store);

static ssize_t rtpm_active_time_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int ret;
	spin_lock_irq(&dev->power.lock);
	update_pm_runtime_accounting(dev);
	ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
	spin_unlock_irq(&dev->power.lock);
	return ret;
}

static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);

static ssize_t rtpm_suspended_time_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int ret;
	spin_lock_irq(&dev->power.lock);
	update_pm_runtime_accounting(dev);
	ret = sprintf(buf, "%i\n",
		jiffies_to_msecs(dev->power.suspended_jiffies));
	spin_unlock_irq(&dev->power.lock);
	return ret;
}

static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);

static ssize_t rtpm_status_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	const char *p;

	if (dev->power.runtime_error) {
		p = "error\n";
	} else if (dev->power.disable_depth) {
		p = "unsupported\n";
	} else {
		switch (dev->power.runtime_status) {
		case RPM_SUSPENDED:
			p = "suspended\n";
			break;
		case RPM_SUSPENDING:
			p = "suspending\n";
			break;
		case RPM_RESUMING:
			p = "resuming\n";
			break;
		case RPM_ACTIVE:
			p = "active\n";
			break;
		default:
			return -EIO;
		}
	}
	return sprintf(buf, p);
}

static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);

static ssize_t autosuspend_delay_ms_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	if (!dev->power.use_autosuspend)
		return -EIO;
	return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
}

static ssize_t autosuspend_delay_ms_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t n)
{
	long delay;

	if (!dev->power.use_autosuspend)
		return -EIO;

	if (strict_strtol(buf, 10, &delay) != 0 || delay != (int) delay)
		return -EINVAL;

	device_lock(dev);
	pm_runtime_set_autosuspend_delay(dev, delay);
	device_unlock(dev);
	return n;
}

static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
		autosuspend_delay_ms_store);

static ssize_t pm_qos_latency_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", dev->power.pq_req->node.prio);
}

static ssize_t pm_qos_latency_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t n)
{
	s32 value;
	int ret;

	if (kstrtos32(buf, 0, &value))
		return -EINVAL;

	if (value < 0)
		return -EINVAL;

	ret = dev_pm_qos_update_request(dev->power.pq_req, value);
	return ret < 0 ? ret : n;
}

static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
		   pm_qos_latency_show, pm_qos_latency_store);
#endif /* CONFIG_PM_RUNTIME */

#ifdef CONFIG_PM_SLEEP
static ssize_t
wake_show(struct device * dev, struct device_attribute *attr, char * buf)
{
	return sprintf(buf, "%s\n", device_can_wakeup(dev)
		? (device_may_wakeup(dev) ? enabled : disabled)
		: "");
}

static ssize_t
wake_store(struct device * dev, struct device_attribute *attr,
	const char * buf, size_t n)
{
	char *cp;
	int len = n;

	if (!device_can_wakeup(dev))
		return -EINVAL;

	cp = memchr(buf, '\n', n);
	if (cp)
		len = cp - buf;
	if (len == sizeof enabled - 1
			&& strncmp(buf, enabled, sizeof enabled - 1) == 0)
		device_set_wakeup_enable(dev, 1);
	else if (len == sizeof disabled - 1
			&& strncmp(buf, disabled, sizeof disabled - 1) == 0)
		device_set_wakeup_enable(dev, 0);
	else
		return -EINVAL;
	return n;
}

static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);

static ssize_t wakeup_count_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	unsigned long count = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		count = dev->power.wakeup->event_count;
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);

static ssize_t wakeup_active_count_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	unsigned long count = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		count = dev->power.wakeup->active_count;
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);

static ssize_t wakeup_hit_count_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	unsigned long count = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		count = dev->power.wakeup->hit_count;
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_hit_count, 0444, wakeup_hit_count_show, NULL);

static ssize_t wakeup_active_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	unsigned int active = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		active = dev->power.wakeup->active;
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);

static ssize_t wakeup_total_time_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	s64 msec = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		msec = ktime_to_ms(dev->power.wakeup->total_time);
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);

static ssize_t wakeup_max_time_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	s64 msec = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		msec = ktime_to_ms(dev->power.wakeup->max_time);
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);

static ssize_t wakeup_last_time_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	s64 msec = 0;
	bool enabled = false;

	spin_lock_irq(&dev->power.lock);
	if (dev->power.wakeup) {
		msec = ktime_to_ms(dev->power.wakeup->last_time);
		enabled = true;
	}
	spin_unlock_irq(&dev->power.lock);
	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}

static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PM_ADVANCED_DEBUG
#ifdef CONFIG_PM_RUNTIME

static ssize_t rtpm_usagecount_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
}

static ssize_t rtpm_children_show(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", dev->power.ignore_children ?
		0 : atomic_read(&dev->power.child_count));
}

static ssize_t rtpm_enabled_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
		return sprintf(buf, "disabled & forbidden\n");
	else if (dev->power.disable_depth)
		return sprintf(buf, "disabled\n");
	else if (dev->power.runtime_auto == false)
		return sprintf(buf, "forbidden\n");
	return sprintf(buf, "enabled\n");
}

static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);

#endif

static ssize_t async_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	return sprintf(buf, "%s\n",
			device_async_suspend_enabled(dev) ? enabled : disabled);
}

static ssize_t async_store(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t n)
{
	char *cp;
	int len = n;

	cp = memchr(buf, '\n', n);
	if (cp)
		len = cp - buf;
	if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
		device_enable_async_suspend(dev);
	else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
		device_disable_async_suspend(dev);
	else
		return -EINVAL;
	return n;
}

static DEVICE_ATTR(async, 0644, async_show, async_store);
#endif /* CONFIG_PM_ADVANCED_DEBUG */

static struct attribute *power_attrs[] = {
#ifdef CONFIG_PM_ADVANCED_DEBUG
#ifdef CONFIG_PM_SLEEP
	&dev_attr_async.attr,
#endif
#ifdef CONFIG_PM_RUNTIME
	&dev_attr_runtime_status.attr,
	&dev_attr_runtime_usage.attr,
	&dev_attr_runtime_active_kids.attr,
	&dev_attr_runtime_enabled.attr,
#endif
#endif /* CONFIG_PM_ADVANCED_DEBUG */
	NULL,
};
static struct attribute_group pm_attr_group = {
	.name	= power_group_name,
	.attrs	= power_attrs,
};

static struct attribute *wakeup_attrs[] = {
#ifdef CONFIG_PM_SLEEP
	&dev_attr_wakeup.attr,
	&dev_attr_wakeup_count.attr,
	&dev_attr_wakeup_active_count.attr,
	&dev_attr_wakeup_hit_count.attr,
	&dev_attr_wakeup_active.attr,
	&dev_attr_wakeup_total_time_ms.attr,
	&dev_attr_wakeup_max_time_ms.attr,
	&dev_attr_wakeup_last_time_ms.attr,
#endif
	NULL,
};
static struct attribute_group pm_wakeup_attr_group = {
	.name	= power_group_name,
	.attrs	= wakeup_attrs,
};

static struct attribute *runtime_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
#ifndef CONFIG_PM_ADVANCED_DEBUG
	&dev_attr_runtime_status.attr,
#endif
	&dev_attr_control.attr,
	&dev_attr_runtime_suspended_time.attr,
	&dev_attr_runtime_active_time.attr,
	&dev_attr_autosuspend_delay_ms.attr,
#endif /* CONFIG_PM_RUNTIME */
	NULL,
};
static struct attribute_group pm_runtime_attr_group = {
	.name	= power_group_name,
	.attrs	= runtime_attrs,
};

static struct attribute *pm_qos_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
	&dev_attr_pm_qos_resume_latency_us.attr,
#endif /* CONFIG_PM_RUNTIME */
	NULL,
};
static struct attribute_group pm_qos_attr_group = {
	.name	= power_group_name,
	.attrs	= pm_qos_attrs,
};

int dpm_sysfs_add(struct device *dev)
{
	int rc;

	rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
	if (rc)
		return rc;

	if (pm_runtime_callbacks_present(dev)) {
		rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
		if (rc)
			goto err_out;
	}

	if (device_can_wakeup(dev)) {
		rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
		if (rc) {
			if (pm_runtime_callbacks_present(dev))
				sysfs_unmerge_group(&dev->kobj,
						    &pm_runtime_attr_group);
			goto err_out;
		}
	}
	return 0;

 err_out:
	sysfs_remove_group(&dev->kobj, &pm_attr_group);
	return rc;
}

int wakeup_sysfs_add(struct device *dev)
{
	return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
}

void wakeup_sysfs_remove(struct device *dev)
{
	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}

int pm_qos_sysfs_add(struct device *dev)
{
	return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group);
}

void pm_qos_sysfs_remove(struct device *dev)
{
	sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group);
}

void rpm_sysfs_remove(struct device *dev)
{
	sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
}

void dpm_sysfs_remove(struct device *dev)
{
	rpm_sysfs_remove(dev);
	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
	sysfs_remove_group(&dev->kobj, &pm_attr_group);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/base/power/sysfs.c - sysfs entries for device PM
	3	*/
	4
	5	#include <linux/device.h>
8c65b4a6	6	#include <linux/string.h>
1b6bc32f	7	#include <linux/export.h>
85dc0b8a	8	#include <linux/pm_qos.h>
53823639	9	#include <linux/pm_runtime.h>
60063497	10	#include <linux/atomic.h>
8d4b9d1b	11	#include <linux/jiffies.h>
1da177e4 LT	12	#include "power.h"
1da177e4 LT	13
0ac85241	14	/*
53823639 RW	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	*
0ac85241 DB	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.
5a2eb858 RW	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.
c125e96f	79	*
15bcb91d AS	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	*
c125e96f	92	* wakeup_count - Report the number of wakeup events related to the device
0ac85241 DB	93	*/
	94
	95	static const char enabled[] = "enabled";
	96	static const char disabled[] = "disabled";
	97
7490e442 AS	98	const char power_group_name[] = "power";
	99	EXPORT_SYMBOL_GPL(power_group_name);
	100
53823639 RW	101	#ifdef CONFIG_PM_RUNTIME
	102	static const char ctrl_auto[] = "auto";
	103	static const char ctrl_on[] = "on";
	104
	105	static ssize_t control_show(struct device dev, struct device_attribute attr,
	106	char *buf)
	107	{
	108	return sprintf(buf, "%s\n",
	109	dev->power.runtime_auto ? ctrl_auto : ctrl_on);
	110	}
	111
	112	static ssize_t control_store(struct device * dev, struct device_attribute *attr,
	113	const char * buf, size_t n)
	114	{
	115	char *cp;
	116	int len = n;
	117
	118	cp = memchr(buf, '\n', n);
	119	if (cp)
	120	len = cp - buf;
69c843b4	121	device_lock(dev);
53823639 RW	122	if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
	123	pm_runtime_allow(dev);
	124	else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
	125	pm_runtime_forbid(dev);
	126	else
69c843b4 AS	127	n = -EINVAL;
69c843b4 AS	128	device_unlock(dev);
53823639 RW	129	return n;
	130	}
	131
	132	static DEVICE_ATTR(control, 0644, control_show, control_store);
0fcb4eef	133
8d4b9d1b AV	134	static ssize_t rtpm_active_time_show(struct device *dev,
	135	struct device_attribute attr, char buf)
	136	{
	137	int ret;
	138	spin_lock_irq(&dev->power.lock);
	139	update_pm_runtime_accounting(dev);
	140	ret = sprintf(buf, "%i\n", jiffies_to_msecs(dev->power.active_jiffies));
	141	spin_unlock_irq(&dev->power.lock);
	142	return ret;
	143	}
	144
	145	static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
	146
	147	static ssize_t rtpm_suspended_time_show(struct device *dev,
	148	struct device_attribute attr, char buf)
	149	{
	150	int ret;
	151	spin_lock_irq(&dev->power.lock);
	152	update_pm_runtime_accounting(dev);
	153	ret = sprintf(buf, "%i\n",
	154	jiffies_to_msecs(dev->power.suspended_jiffies));
	155	spin_unlock_irq(&dev->power.lock);
	156	return ret;
	157	}
	158
	159	static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
	160
0fcb4eef AS	161	static ssize_t rtpm_status_show(struct device *dev,
	162	struct device_attribute attr, char buf)
	163	{
	164	const char *p;
	165
	166	if (dev->power.runtime_error) {
	167	p = "error\n";
	168	} else if (dev->power.disable_depth) {
	169	p = "unsupported\n";
	170	} else {
	171	switch (dev->power.runtime_status) {
	172	case RPM_SUSPENDED:
	173	p = "suspended\n";
	174	break;
	175	case RPM_SUSPENDING:
	176	p = "suspending\n";
	177	break;
	178	case RPM_RESUMING:
	179	p = "resuming\n";
	180	break;
	181	case RPM_ACTIVE:
	182	p = "active\n";
	183	break;
	184	default:
	185	return -EIO;
	186	}
	187	}
	188	return sprintf(buf, p);
	189	}
	190
	191	static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
15bcb91d AS	192
	193	static ssize_t autosuspend_delay_ms_show(struct device *dev,
	194	struct device_attribute attr, char buf)
	195	{
	196	if (!dev->power.use_autosuspend)
	197	return -EIO;
	198	return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
	199	}
	200
	201	static ssize_t autosuspend_delay_ms_store(struct device *dev,
	202	struct device_attribute attr, const char buf, size_t n)
	203	{
	204	long delay;
	205
	206	if (!dev->power.use_autosuspend)
	207	return -EIO;
	208
	209	if (strict_strtol(buf, 10, &delay) != 0 \|\| delay != (int) delay)
	210	return -EINVAL;
	211
69c843b4	212	device_lock(dev);
15bcb91d	213	pm_runtime_set_autosuspend_delay(dev, delay);
69c843b4	214	device_unlock(dev);
15bcb91d AS	215	return n;
	216	}
	217
	218	static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
	219	autosuspend_delay_ms_store);
	220
85dc0b8a RW	221	static ssize_t pm_qos_latency_show(struct device *dev,
	222	struct device_attribute attr, char buf)
	223	{
	224	return sprintf(buf, "%d\n", dev->power.pq_req->node.prio);
	225	}
	226
	227	static ssize_t pm_qos_latency_store(struct device *dev,
	228	struct device_attribute *attr,
	229	const char *buf, size_t n)
	230	{
	231	s32 value;
	232	int ret;
	233
	234	if (kstrtos32(buf, 0, &value))
	235	return -EINVAL;
	236
	237	if (value < 0)
	238	return -EINVAL;
	239
	240	ret = dev_pm_qos_update_request(dev->power.pq_req, value);
	241	return ret < 0 ? ret : n;
	242	}
	243
	244	static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
	245	pm_qos_latency_show, pm_qos_latency_store);
e762318b	246	#endif /* CONFIG_PM_RUNTIME */
53823639	247
e762318b	248	#ifdef CONFIG_PM_SLEEP
0ac85241 DB	249	static ssize_t
	250	wake_show(struct device * dev, struct device_attribute attr, char buf)
	251	{
	252	return sprintf(buf, "%s\n", device_can_wakeup(dev)
	253	? (device_may_wakeup(dev) ? enabled : disabled)
	254	: "");
	255	}
	256
	257	static ssize_t
	258	wake_store(struct device * dev, struct device_attribute *attr,
	259	const char * buf, size_t n)
	260	{
	261	char *cp;
	262	int len = n;
	263
	264	if (!device_can_wakeup(dev))
	265	return -EINVAL;
	266
	267	cp = memchr(buf, '\n', n);
	268	if (cp)
	269	len = cp - buf;
	270	if (len == sizeof enabled - 1
	271	&& strncmp(buf, enabled, sizeof enabled - 1) == 0)
	272	device_set_wakeup_enable(dev, 1);
	273	else if (len == sizeof disabled - 1
	274	&& strncmp(buf, disabled, sizeof disabled - 1) == 0)
	275	device_set_wakeup_enable(dev, 0);
	276	else
	277	return -EINVAL;
	278	return n;
	279	}
	280
	281	static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
	282
c125e96f RW	283	static ssize_t wakeup_count_show(struct device *dev,
	284	struct device_attribute attr, char buf)
	285	{
074037ec RW	286	unsigned long count = 0;
	287	bool enabled = false;
	288
	289	spin_lock_irq(&dev->power.lock);
	290	if (dev->power.wakeup) {
	291	count = dev->power.wakeup->event_count;
	292	enabled = true;
	293	}
	294	spin_unlock_irq(&dev->power.lock);
	295	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
c125e96f RW	296	}
	297
	298	static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
074037ec RW	299
	300	static ssize_t wakeup_active_count_show(struct device *dev,
	301	struct device_attribute attr, char buf)
	302	{
	303	unsigned long count = 0;
	304	bool enabled = false;
	305
	306	spin_lock_irq(&dev->power.lock);
	307	if (dev->power.wakeup) {
	308	count = dev->power.wakeup->active_count;
	309	enabled = true;
	310	}
	311	spin_unlock_irq(&dev->power.lock);
	312	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
	313	}
	314
	315	static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
	316
	317	static ssize_t wakeup_hit_count_show(struct device *dev,
	318	struct device_attribute attr, char buf)
	319	{
	320	unsigned long count = 0;
	321	bool enabled = false;
	322
	323	spin_lock_irq(&dev->power.lock);
	324	if (dev->power.wakeup) {
	325	count = dev->power.wakeup->hit_count;
	326	enabled = true;
	327	}
	328	spin_unlock_irq(&dev->power.lock);
	329	return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
	330	}
	331
	332	static DEVICE_ATTR(wakeup_hit_count, 0444, wakeup_hit_count_show, NULL);
	333
	334	static ssize_t wakeup_active_show(struct device *dev,
	335	struct device_attribute attr, char buf)
	336	{
	337	unsigned int active = 0;
	338	bool enabled = false;
	339
	340	spin_lock_irq(&dev->power.lock);
	341	if (dev->power.wakeup) {
	342	active = dev->power.wakeup->active;
	343	enabled = true;
	344	}
	345	spin_unlock_irq(&dev->power.lock);
	346	return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
	347	}
	348
	349	static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
	350
	351	static ssize_t wakeup_total_time_show(struct device *dev,
	352	struct device_attribute attr, char buf)
	353	{
	354	s64 msec = 0;
	355	bool enabled = false;
	356
	357	spin_lock_irq(&dev->power.lock);
	358	if (dev->power.wakeup) {
	359	msec = ktime_to_ms(dev->power.wakeup->total_time);
	360	enabled = true;
	361	}
	362	spin_unlock_irq(&dev->power.lock);
363	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
364	}
365
366	static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
367
368	static ssize_t wakeup_max_time_show(struct device *dev,
369	struct device_attribute attr, char buf)
370	{
371	s64 msec = 0;
372	bool enabled = false;
373
374	spin_lock_irq(&dev->power.lock);
375	if (dev->power.wakeup) {
376	msec = ktime_to_ms(dev->power.wakeup->max_time);
377	enabled = true;
378	}
379	spin_unlock_irq(&dev->power.lock);
380	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
381	}
382
383	static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
384
385	static ssize_t wakeup_last_time_show(struct device *dev,
386	struct device_attribute attr, char buf)
387	{
388	s64 msec = 0;
389	bool enabled = false;
390
391	spin_lock_irq(&dev->power.lock);
392	if (dev->power.wakeup) {
393	msec = ktime_to_ms(dev->power.wakeup->last_time);
394	enabled = true;
395	}
396	spin_unlock_irq(&dev->power.lock);
397	return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
398	}
399
400	static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
401	#endif /* CONFIG_PM_SLEEP */
c125e96f	402
c92445fa DB	403	#ifdef CONFIG_PM_ADVANCED_DEBUG
	404	#ifdef CONFIG_PM_RUNTIME
	405
	406	static ssize_t rtpm_usagecount_show(struct device *dev,
	407	struct device_attribute attr, char buf)
	408	{
	409	return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
	410	}
	411
	412	static ssize_t rtpm_children_show(struct device *dev,
	413	struct device_attribute attr, char buf)
	414	{
	415	return sprintf(buf, "%d\n", dev->power.ignore_children ?
	416	0 : atomic_read(&dev->power.child_count));
	417	}
	418
	419	static ssize_t rtpm_enabled_show(struct device *dev,
	420	struct device_attribute attr, char buf)
	421	{
	422	if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
	423	return sprintf(buf, "disabled & forbidden\n");
	424	else if (dev->power.disable_depth)
	425	return sprintf(buf, "disabled\n");
	426	else if (dev->power.runtime_auto == false)
	427	return sprintf(buf, "forbidden\n");
	428	return sprintf(buf, "enabled\n");
	429	}
	430
c92445fa DB	431	static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
c92445fa DB	432	static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
c92445fa DB	433	static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
	434
	435	#endif
	436
5a2eb858 RW	437	static ssize_t async_show(struct device dev, struct device_attribute attr,
	438	char *buf)
	439	{
	440	return sprintf(buf, "%s\n",
	441	device_async_suspend_enabled(dev) ? enabled : disabled);
	442	}
	443
	444	static ssize_t async_store(struct device dev, struct device_attribute attr,
	445	const char *buf, size_t n)
	446	{
	447	char *cp;
	448	int len = n;
	449
	450	cp = memchr(buf, '\n', n);
	451	if (cp)
	452	len = cp - buf;
	453	if (len == sizeof enabled - 1 && strncmp(buf, enabled, len) == 0)
	454	device_enable_async_suspend(dev);
	455	else if (len == sizeof disabled - 1 && strncmp(buf, disabled, len) == 0)
	456	device_disable_async_suspend(dev);
	457	else
	458	return -EINVAL;
	459	return n;
	460	}
	461
	462	static DEVICE_ATTR(async, 0644, async_show, async_store);
c92445fa	463	#endif /* CONFIG_PM_ADVANCED_DEBUG */
0ac85241	464
cb8f51bd	465	static struct attribute *power_attrs[] = {
c92445fa	466	#ifdef CONFIG_PM_ADVANCED_DEBUG
cb8f51bd	467	#ifdef CONFIG_PM_SLEEP
5a2eb858	468	&dev_attr_async.attr,
cb8f51bd	469	#endif
c92445fa	470	#ifdef CONFIG_PM_RUNTIME
7490e442	471	&dev_attr_runtime_status.attr,
c92445fa DB	472	&dev_attr_runtime_usage.attr,
c92445fa DB	473	&dev_attr_runtime_active_kids.attr,
c92445fa DB	474	&dev_attr_runtime_enabled.attr,
c92445fa DB	475	#endif
cb8f51bd	476	#endif /* CONFIG_PM_ADVANCED_DEBUG */
1da177e4 LT	477	NULL,
	478	};
	479	static struct attribute_group pm_attr_group = {
7490e442	480	.name = power_group_name,
1da177e4 LT	481	.attrs = power_attrs,
	482	};
	483
cb8f51bd RW	484	static struct attribute *wakeup_attrs[] = {
	485	#ifdef CONFIG_PM_SLEEP
	486	&dev_attr_wakeup.attr,
	487	&dev_attr_wakeup_count.attr,
	488	&dev_attr_wakeup_active_count.attr,
	489	&dev_attr_wakeup_hit_count.attr,
	490	&dev_attr_wakeup_active.attr,
	491	&dev_attr_wakeup_total_time_ms.attr,
	492	&dev_attr_wakeup_max_time_ms.attr,
	493	&dev_attr_wakeup_last_time_ms.attr,
	494	#endif
	495	NULL,
	496	};
	497	static struct attribute_group pm_wakeup_attr_group = {
	498	.name = power_group_name,
	499	.attrs = wakeup_attrs,
	500	};
7490e442 AS	501
7490e442 AS	502	static struct attribute *runtime_attrs[] = {
cb8f51bd	503	#ifdef CONFIG_PM_RUNTIME
7490e442 AS	504	#ifndef CONFIG_PM_ADVANCED_DEBUG
	505	&dev_attr_runtime_status.attr,
	506	#endif
	507	&dev_attr_control.attr,
	508	&dev_attr_runtime_suspended_time.attr,
	509	&dev_attr_runtime_active_time.attr,
15bcb91d	510	&dev_attr_autosuspend_delay_ms.attr,
cb8f51bd	511	#endif /* CONFIG_PM_RUNTIME */
7490e442 AS	512	NULL,
	513	};
	514	static struct attribute_group pm_runtime_attr_group = {
	515	.name = power_group_name,
	516	.attrs = runtime_attrs,
	517	};
	518
85dc0b8a RW	519	static struct attribute *pm_qos_attrs[] = {
	520	#ifdef CONFIG_PM_RUNTIME
	521	&dev_attr_pm_qos_resume_latency_us.attr,
	522	#endif /* CONFIG_PM_RUNTIME */
	523	NULL,
	524	};
	525	static struct attribute_group pm_qos_attr_group = {
	526	.name = power_group_name,
	527	.attrs = pm_qos_attrs,
	528	};
	529
7490e442 AS	530	int dpm_sysfs_add(struct device *dev)
	531	{
	532	int rc;
	533
	534	rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
cb8f51bd RW	535	if (rc)
	536	return rc;
	537
	538	if (pm_runtime_callbacks_present(dev)) {
7490e442 AS	539	rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
7490e442 AS	540	if (rc)
cb8f51bd RW	541	goto err_out;
	542	}
	543
	544	if (device_can_wakeup(dev)) {
	545	rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
	546	if (rc) {
	547	if (pm_runtime_callbacks_present(dev))
	548	sysfs_unmerge_group(&dev->kobj,
	549	&pm_runtime_attr_group);
	550	goto err_out;
	551	}
7490e442	552	}
cb8f51bd RW	553	return 0;
	554
	555	err_out:
	556	sysfs_remove_group(&dev->kobj, &pm_attr_group);
7490e442 AS	557	return rc;
	558	}
	559
cb8f51bd	560	int wakeup_sysfs_add(struct device *dev)
7490e442	561	{
cb8f51bd	562	return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
7490e442 AS	563	}
7490e442 AS	564
cb8f51bd	565	void wakeup_sysfs_remove(struct device *dev)
7490e442	566	{
cb8f51bd	567	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
7490e442 AS	568	}
7490e442 AS	569
85dc0b8a RW	570	int pm_qos_sysfs_add(struct device *dev)
	571	{
	572	return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group);
	573	}
	574
	575	void pm_qos_sysfs_remove(struct device *dev)
	576	{
	577	sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group);
	578	}
	579
cb8f51bd	580	void rpm_sysfs_remove(struct device *dev)
1da177e4	581	{
cb8f51bd	582	sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
1da177e4 LT	583	}
1da177e4 LT	584
cb8f51bd	585	void dpm_sysfs_remove(struct device *dev)
1da177e4	586	{
cb8f51bd RW	587	rpm_sysfs_remove(dev);
cb8f51bd RW	588	sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
1da177e4 LT	589	sysfs_remove_group(&dev->kobj, &pm_attr_group);
1da177e4 LT	590	}