// SPDX-License-Identifier: GPL-2.0/* sysfs entries for device PM */#include <linux/device.h>#include <linux/kobject.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 */ const char power_group_name[] = "power";EXPORT_SYMBOL_GPL(power_group_name); 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 sysfs_emit(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){	device_lock(dev);	if (sysfs_streq(buf, ctrl_auto))		pm_runtime_allow(dev);	else if (sysfs_streq(buf, ctrl_on))		pm_runtime_forbid(dev);	else		n = -EINVAL;	device_unlock(dev);	return n;} static DEVICE_ATTR_RW(control); static ssize_t runtime_active_time_show(struct device *dev,					struct device_attribute *attr,					char *buf){	u64 tmp = pm_runtime_active_time(dev); 	do_div(tmp, NSEC_PER_MSEC); 	return sysfs_emit(buf, "%llu\n", tmp);} static DEVICE_ATTR_RO(runtime_active_time); static ssize_t runtime_suspended_time_show(struct device *dev,					   struct device_attribute *attr,					   char *buf){	u64 tmp = pm_runtime_suspended_time(dev); 	do_div(tmp, NSEC_PER_MSEC); 	return sysfs_emit(buf, "%llu\n", tmp);} static DEVICE_ATTR_RO(runtime_suspended_time); static ssize_t runtime_status_show(struct device *dev,				   struct device_attribute *attr, char *buf){	const char *output; 	if (dev->power.runtime_error) {		output = "error";	} else if (dev->power.disable_depth) {		output = "unsupported";	} else {		switch (dev->power.runtime_status) {		case RPM_SUSPENDED:			output = "suspended";			break;		case RPM_SUSPENDING:			output = "suspending";			break;		case RPM_RESUMING:			output = "resuming";			break;		case RPM_ACTIVE:			output = "active";			break;		default:			return -EIO;		}	}	return sysfs_emit(buf, "%s\n", output);} static DEVICE_ATTR_RO(runtime_status); static ssize_t autosuspend_delay_ms_show(struct device *dev,					 struct device_attribute *attr,					 char *buf){	if (!dev->power.use_autosuspend)		return -EIO; 	return sysfs_emit(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 (kstrtol(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_RW(autosuspend_delay_ms); static ssize_t pm_qos_resume_latency_us_show(struct device *dev,					     struct device_attribute *attr,					     char *buf){	s32 value = dev_pm_qos_requested_resume_latency(dev); 	if (value == 0)		return sysfs_emit(buf, "n/a\n");	if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)		value = 0; 	return sysfs_emit(buf, "%d\n", value);} static ssize_t pm_qos_resume_latency_us_store(struct device *dev,					      struct device_attribute *attr,					      const char *buf, size_t n){	s32 value;	int ret; 	if (!kstrtos32(buf, 0, &value)) {		/*		 * Prevent users from writing negative or "no constraint" values		 * directly.		 */		if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)			return -EINVAL; 		if (value == 0)			value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;	} else if (sysfs_streq(buf, "n/a")) {		value = 0;	} else {		return -EINVAL;	} 	ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,					value);	return ret < 0 ? ret : n;} static DEVICE_ATTR_RW(pm_qos_resume_latency_us); static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,						struct device_attribute *attr,						char *buf){	s32 value = dev_pm_qos_get_user_latency_tolerance(dev); 	if (value < 0)		return sysfs_emit(buf, "%s\n", "auto");	if (value == PM_QOS_LATENCY_ANY)		return sysfs_emit(buf, "%s\n", "any"); 	return sysfs_emit(buf, "%d\n", value);} static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,						 struct device_attribute *attr,						 const char *buf, size_t n){	s32 value;	int ret; 	if (kstrtos32(buf, 0, &value) == 0) {		/* Users can't write negative values directly */		if (value < 0)			return -EINVAL;	} else {		if (sysfs_streq(buf, "auto"))			value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;		else if (sysfs_streq(buf, "any"))			value = PM_QOS_LATENCY_ANY;		else			return -EINVAL;	}	ret = dev_pm_qos_update_user_latency_tolerance(dev, value);	return ret < 0 ? ret : n;} static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us); static ssize_t pm_qos_no_power_off_show(struct device *dev,					struct device_attribute *attr,					char *buf){	return sysfs_emit(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)					  & PM_QOS_FLAG_NO_POWER_OFF));} static ssize_t pm_qos_no_power_off_store(struct device *dev,					 struct device_attribute *attr,					 const char *buf, size_t n){	int ret; 	if (kstrtoint(buf, 0, &ret))		return -EINVAL; 	if (ret != 0 && ret != 1)		return -EINVAL; 	ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);	return ret < 0 ? ret : n;} static DEVICE_ATTR_RW(pm_qos_no_power_off); #ifdef CONFIG_PM_SLEEPstatic const char _enabled[] = "enabled";static const char _disabled[] = "disabled"; static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,			   char *buf){	return sysfs_emit(buf, "%s\n", device_can_wakeup(dev)			  ? (device_may_wakeup(dev) ? _enabled : _disabled)			  : "");} static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,			    const char *buf, size_t n){	if (!device_can_wakeup(dev))		return -EINVAL; 	if (sysfs_streq(buf, _enabled))		device_set_wakeup_enable(dev, 1);	else if (sysfs_streq(buf, _disabled))		device_set_wakeup_enable(dev, 0);	else		return -EINVAL;	return n;} static DEVICE_ATTR_RW(wakeup); static ssize_t wakeup_count_show(struct device *dev,				 struct device_attribute *attr, char *buf){	unsigned long count;	bool enabled = false; 	spin_lock_irq(&dev->power.lock);	if (dev->power.wakeup) {		count = dev->power.wakeup->wakeup_count;		enabled = true;	}	spin_unlock_irq(&dev->power.lock); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lu\n", count);} static DEVICE_ATTR_RO(wakeup_count); static ssize_t wakeup_active_count_show(struct device *dev,					struct device_attribute *attr,					char *buf){	unsigned long count;	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); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lu\n", count);} static DEVICE_ATTR_RO(wakeup_active_count); static ssize_t wakeup_abort_count_show(struct device *dev,				       struct device_attribute *attr,				       char *buf){	unsigned long count;	bool enabled = false; 	spin_lock_irq(&dev->power.lock);	if (dev->power.wakeup) {		count = dev->power.wakeup->wakeup_count;		enabled = true;	}	spin_unlock_irq(&dev->power.lock); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lu\n", count);} static DEVICE_ATTR_RO(wakeup_abort_count); static ssize_t wakeup_expire_count_show(struct device *dev,					struct device_attribute *attr,					char *buf){	unsigned long count;	bool enabled = false; 	spin_lock_irq(&dev->power.lock);	if (dev->power.wakeup) {		count = dev->power.wakeup->expire_count;		enabled = true;	}	spin_unlock_irq(&dev->power.lock); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lu\n", count);} static DEVICE_ATTR_RO(wakeup_expire_count); static ssize_t wakeup_active_show(struct device *dev,				  struct device_attribute *attr, char *buf){	unsigned int active;	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); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%u\n", active);} static DEVICE_ATTR_RO(wakeup_active); static ssize_t wakeup_total_time_ms_show(struct device *dev,					 struct device_attribute *attr,					 char *buf){	s64 msec;	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); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lld\n", msec);} static DEVICE_ATTR_RO(wakeup_total_time_ms); static ssize_t wakeup_max_time_ms_show(struct device *dev,				       struct device_attribute *attr, char *buf){	s64 msec;	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); 	if (!enabled)		return sysfs_emit(buf, "\n");	return sysfs_emit(buf, "%lld\n", msec);} static DEVICE_ATTR_RO(wakeup_max_time_ms); static ssize_t wakeup_last_time_ms_show(struct device *dev,					struct device_attribute *attr,					char *buf){	s64 msec;	bool enabled = false; 	spin_lock_irq(&dev->power.lock);	if (dev->power.wakeup) {

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