drivers/acpi/device_pm.c - kernel/msm-4.9 - Gitiles

 /*
  * drivers/acpi/device_pm.c - ACPI device power management routines.
  *
  * Copyright (C) 2012, Intel Corp.
  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful, but
  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/device.h>
 #include <linux/export.h>
 #include <linux/mutex.h>
 #include <linux/pm_qos.h>
 #include <linux/pm_runtime.h>

 #include <acpi/acpi.h>
 #include <acpi/acpi_bus.h>

 static DEFINE_MUTEX(acpi_pm_notifier_lock);

 /**
  * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
  * @adev: ACPI device to add the notifier for.
  * @context: Context information to pass to the notifier routine.
  *
  * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
  * PM wakeup events.  For example, wakeup events may be generated for bridges
  * if one of the devices below the bridge is signaling wakeup, even if the
  * bridge itself doesn't have a wakeup GPE associated with it.
  */
 acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
 				 acpi_notify_handler handler, void *context)
 {
 	acpi_status status = AE_ALREADY_EXISTS;

 	mutex_lock(&acpi_pm_notifier_lock);

 	if (adev->wakeup.flags.notifier_present)
 		goto out;

 	status = acpi_install_notify_handler(adev->handle,
 					     ACPI_SYSTEM_NOTIFY,
 					     handler, context);
 	if (ACPI_FAILURE(status))
 		goto out;

 	adev->wakeup.flags.notifier_present = true;

  out:
 	mutex_unlock(&acpi_pm_notifier_lock);
 	return status;
 }

 /**
  * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
  * @adev: ACPI device to remove the notifier from.
  */
 acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
 				    acpi_notify_handler handler)
 {
 	acpi_status status = AE_BAD_PARAMETER;

 	mutex_lock(&acpi_pm_notifier_lock);

 	if (!adev->wakeup.flags.notifier_present)
 		goto out;

 	status = acpi_remove_notify_handler(adev->handle,
 					    ACPI_SYSTEM_NOTIFY,
 					    handler);
 	if (ACPI_FAILURE(status))
 		goto out;

 	adev->wakeup.flags.notifier_present = false;

  out:
 	mutex_unlock(&acpi_pm_notifier_lock);
 	return status;
 }

 /**
  * acpi_device_power_state - Get preferred power state of ACPI device.
  * @dev: Device whose preferred target power state to return.
  * @adev: ACPI device node corresponding to @dev.
  * @target_state: System state to match the resultant device state.
  * @d_max_in: Deepest low-power state to take into consideration.
  * @d_min_p: Location to store the upper limit of the allowed states range.
  * Return value: Preferred power state of the device on success, -ENODEV
  * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
  *
  * Find the lowest power (highest number) ACPI device power state that the
  * device can be in while the system is in the state represented by
  * @target_state.  If @d_min_p is set, the highest power (lowest number) device
  * power state that @dev can be in for the given system sleep state is stored
  * at the location pointed to by it.
  *
  * Callers must ensure that @dev and @adev are valid pointers and that @adev
  * actually corresponds to @dev before using this function.
  */
 int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
 			    u32 target_state, int d_max_in, int *d_min_p)
 {
 	char acpi_method[] = "_SxD";
 	unsigned long long d_min, d_max;
 	bool wakeup = false;

 	if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
 		return -EINVAL;

 	if (d_max_in > ACPI_STATE_D3_HOT) {
 		enum pm_qos_flags_status stat;

 		stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
 		if (stat == PM_QOS_FLAGS_ALL)
 			d_max_in = ACPI_STATE_D3_HOT;
 	}

 	acpi_method[2] = '0' + target_state;
 	/*
 	 * If the sleep state is S0, the lowest limit from ACPI is D3,
 	 * but if the device has _S0W, we will use the value from _S0W
 	 * as the lowest limit from ACPI.  Finally, we will constrain
 	 * the lowest limit with the specified one.
 	 */
 	d_min = ACPI_STATE_D0;
 	d_max = ACPI_STATE_D3;

 	/*
 	 * If present, _SxD methods return the minimum D-state (highest power
 	 * state) we can use for the corresponding S-states.  Otherwise, the
 	 * minimum D-state is D0 (ACPI 3.x).
 	 *
 	 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 	 * provided -- that's our fault recovery, we ignore retval.
 	 */
 	if (target_state > ACPI_STATE_S0) {
 		acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
 		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
 			&& adev->wakeup.sleep_state >= target_state;
 	} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
 			PM_QOS_FLAGS_NONE) {
 		wakeup = adev->wakeup.flags.valid;
 	}

 	/*
 	 * If _PRW says we can wake up the system from the target sleep state,
 	 * the D-state returned by _SxD is sufficient for that (we assume a
 	 * wakeup-aware driver if wake is set).  Still, if _SxW exists
 	 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 	 * can wake the system.  _S0W may be valid, too.
 	 */
 	if (wakeup) {
 		acpi_status status;

 		acpi_method[3] = 'W';
 		status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
 						&d_max);
 		if (ACPI_FAILURE(status)) {
 			if (target_state != ACPI_STATE_S0 ||
 			    status != AE_NOT_FOUND)
 				d_max = d_min;
 		} else if (d_max < d_min) {
 			/* Warn the user of the broken DSDT */
 			printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 				acpi_method);
 			/* Sanitize it */
 			d_min = d_max;
 		}
 	}

 	if (d_max_in < d_min)
 		return -EINVAL;
 	if (d_min_p)
 		*d_min_p = d_min;
 	/* constrain d_max with specified lowest limit (max number) */
 	if (d_max > d_max_in) {
 		for (d_max = d_max_in; d_max > d_min; d_max--) {
 			if (adev->power.states[d_max].flags.valid)
 				break;
 		}
 	}
 	return d_max;
 }
 EXPORT_SYMBOL_GPL(acpi_device_power_state);

 /**
  * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
  * @dev: Device whose preferred target power state to return.
  * @d_min_p: Location to store the upper limit of the allowed states range.
  * @d_max_in: Deepest low-power state to take into consideration.
  * Return value: Preferred power state of the device on success, -ENODEV
  * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
  *
  * The caller must ensure that @dev is valid before using this function.
  */
 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 {
 	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 	struct acpi_device *adev;

 	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
 		return -ENODEV;
 	}

 	return acpi_device_power_state(dev, adev, acpi_target_system_state(),
 				       d_max_in, d_min_p);
 }
 EXPORT_SYMBOL(acpi_pm_device_sleep_state);

 #ifdef CONFIG_PM_RUNTIME
 /**
  * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
  * @adev: ACPI device to enable/disable the remote wakeup for.
  * @enable: Whether to enable or disable the wakeup functionality.
  *
  * Enable/disable the GPE associated with @adev so that it can generate
  * wakeup signals for the device in response to external (remote) events and
  * enable/disable device wakeup power.
  *
  * Callers must ensure that @adev is a valid ACPI device node before executing
  * this function.
  */
 int __acpi_device_run_wake(struct acpi_device *adev, bool enable)
 {
 	struct acpi_device_wakeup *wakeup = &adev->wakeup;

 	if (enable) {
 		acpi_status res;
 		int error;

 		error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0);
 		if (error)
 			return error;

 		res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
 		if (ACPI_FAILURE(res)) {
 			acpi_disable_wakeup_device_power(adev);
 			return -EIO;
 		}
 	} else {
 		acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
 		acpi_disable_wakeup_device_power(adev);
 	}
 	return 0;
 }

 /**
  * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
  * @dev: Device to enable/disable the platform to wake up.
  * @enable: Whether to enable or disable the wakeup functionality.
  */
 int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
 {
 	struct acpi_device *adev;
 	acpi_handle handle;

 	if (!device_run_wake(phys_dev))
 		return -EINVAL;

 	handle = DEVICE_ACPI_HANDLE(phys_dev);
 	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 		dev_dbg(phys_dev, "ACPI handle without context in %s!\n",
 			__func__);
 		return -ENODEV;
 	}

 	return __acpi_device_run_wake(adev, enable);
 }
 EXPORT_SYMBOL(acpi_pm_device_run_wake);
 #endif /* CONFIG_PM_RUNTIME */

  #ifdef CONFIG_PM_SLEEP
 /**
  * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
  * @dev: Device to enable/desible to wake up the system.
  * @target_state: System state the device is supposed to wake up from.
  * @enable: Whether to enable or disable @dev to wake up the system.
  */
 int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state,
 			     bool enable)
 {
 	return enable ?
 		acpi_enable_wakeup_device_power(adev, target_state) :
 		acpi_disable_wakeup_device_power(adev);
 }

 /**
  * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
  * @dev: Device to enable/desible to wake up the system from sleep states.
  * @enable: Whether to enable or disable @dev to wake up the system.
  */
 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 {
 	acpi_handle handle;
 	struct acpi_device *adev;
 	int error;

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

 	handle = DEVICE_ACPI_HANDLE(dev);
 	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
 		return -ENODEV;
 	}

 	error = __acpi_device_sleep_wake(adev, acpi_target_system_state(),
 					 enable);
 	if (!error)
 		dev_info(dev, "System wakeup %s by ACPI\n",
 				enable ? "enabled" : "disabled");

 	return error;
 }
 #endif /* CONFIG_PM_SLEEP */
	/*
	* drivers/acpi/device_pm.c - ACPI device power management routines.
	*
	* Copyright (C) 2012, Intel Corp.
	* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/device.h>
	#include <linux/export.h>
	#include <linux/mutex.h>
	#include <linux/pm_qos.h>
	#include <linux/pm_runtime.h>

	#include <acpi/acpi.h>
	#include <acpi/acpi_bus.h>

	static DEFINE_MUTEX(acpi_pm_notifier_lock);

	/**
	* acpi_add_pm_notifier - Register PM notifier for given ACPI device.
	* @adev: ACPI device to add the notifier for.
	* @context: Context information to pass to the notifier routine.
	*
	* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
	* PM wakeup events. For example, wakeup events may be generated for bridges
	* if one of the devices below the bridge is signaling wakeup, even if the
	* bridge itself doesn't have a wakeup GPE associated with it.
	*/
	acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
	acpi_notify_handler handler, void *context)
	{
	acpi_status status = AE_ALREADY_EXISTS;

	mutex_lock(&acpi_pm_notifier_lock);

	if (adev->wakeup.flags.notifier_present)
	goto out;

	status = acpi_install_notify_handler(adev->handle,
	ACPI_SYSTEM_NOTIFY,
	handler, context);
	if (ACPI_FAILURE(status))
	goto out;

	adev->wakeup.flags.notifier_present = true;

	out:
	mutex_unlock(&acpi_pm_notifier_lock);
	return status;
	}

	/**
	* acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
	* @adev: ACPI device to remove the notifier from.
	*/
	acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
	acpi_notify_handler handler)
	{
	acpi_status status = AE_BAD_PARAMETER;

	mutex_lock(&acpi_pm_notifier_lock);

	if (!adev->wakeup.flags.notifier_present)
	goto out;

	status = acpi_remove_notify_handler(adev->handle,
	ACPI_SYSTEM_NOTIFY,
	handler);
	if (ACPI_FAILURE(status))
	goto out;

	adev->wakeup.flags.notifier_present = false;

	out:
	mutex_unlock(&acpi_pm_notifier_lock);
	return status;
	}

	/**
	* acpi_device_power_state - Get preferred power state of ACPI device.
	* @dev: Device whose preferred target power state to return.
	* @adev: ACPI device node corresponding to @dev.
	* @target_state: System state to match the resultant device state.
	* @d_max_in: Deepest low-power state to take into consideration.
	* @d_min_p: Location to store the upper limit of the allowed states range.
	* Return value: Preferred power state of the device on success, -ENODEV
	* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
	*
	* Find the lowest power (highest number) ACPI device power state that the
	* device can be in while the system is in the state represented by
	* @target_state. If @d_min_p is set, the highest power (lowest number) device
	* power state that @dev can be in for the given system sleep state is stored
	* at the location pointed to by it.
	*
	* Callers must ensure that @dev and @adev are valid pointers and that @adev
	* actually corresponds to @dev before using this function.
	*/
	int acpi_device_power_state(struct device dev, struct acpi_device adev,
	u32 target_state, int d_max_in, int *d_min_p)
	{
	char acpi_method[] = "_SxD";
	unsigned long long d_min, d_max;
	bool wakeup = false;

	if (d_max_in < ACPI_STATE_D0 \|\| d_max_in > ACPI_STATE_D3)
	return -EINVAL;

	if (d_max_in > ACPI_STATE_D3_HOT) {
	enum pm_qos_flags_status stat;

	stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
	if (stat == PM_QOS_FLAGS_ALL)
	d_max_in = ACPI_STATE_D3_HOT;
	}

	acpi_method[2] = '0' + target_state;
	/*
	* If the sleep state is S0, the lowest limit from ACPI is D3,
	* but if the device has _S0W, we will use the value from _S0W
	* as the lowest limit from ACPI. Finally, we will constrain
	* the lowest limit with the specified one.
	*/
	d_min = ACPI_STATE_D0;
	d_max = ACPI_STATE_D3;

	/*
	* If present, _SxD methods return the minimum D-state (highest power
	* state) we can use for the corresponding S-states. Otherwise, the
	* minimum D-state is D0 (ACPI 3.x).
	*
	* NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	* provided -- that's our fault recovery, we ignore retval.
	*/
	if (target_state > ACPI_STATE_S0) {
	acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
	wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
	&& adev->wakeup.sleep_state >= target_state;
	} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
	PM_QOS_FLAGS_NONE) {
	wakeup = adev->wakeup.flags.valid;
	}

	/*
	* If _PRW says we can wake up the system from the target sleep state,
	* the D-state returned by _SxD is sufficient for that (we assume a
	* wakeup-aware driver if wake is set). Still, if _SxW exists
	* (ACPI 3.x), it should return the maximum (lowest power) D-state that
	* can wake the system. _S0W may be valid, too.
	*/
	if (wakeup) {
	acpi_status status;

	acpi_method[3] = 'W';
	status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
	&d_max);
	if (ACPI_FAILURE(status)) {
	if (target_state != ACPI_STATE_S0 \|\|
	status != AE_NOT_FOUND)
	d_max = d_min;
	} else if (d_max < d_min) {
	/* Warn the user of the broken DSDT */
	printk(KERN_WARNING "ACPI: Wrong value from %s\n",
	acpi_method);
	/* Sanitize it */
	d_min = d_max;
	}
	}

	if (d_max_in < d_min)
	return -EINVAL;
	if (d_min_p)
	*d_min_p = d_min;
	/* constrain d_max with specified lowest limit (max number) */
	if (d_max > d_max_in) {
	for (d_max = d_max_in; d_max > d_min; d_max--) {
	if (adev->power.states[d_max].flags.valid)
	break;
	}
	}
	return d_max;
	}
	EXPORT_SYMBOL_GPL(acpi_device_power_state);

	/**
	* acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
	* @dev: Device whose preferred target power state to return.
	* @d_min_p: Location to store the upper limit of the allowed states range.
	* @d_max_in: Deepest low-power state to take into consideration.
	* Return value: Preferred power state of the device on success, -ENODEV
	* (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
	*
	* The caller must ensure that @dev is valid before using this function.
	*/
	int acpi_pm_device_sleep_state(struct device dev, int d_min_p, int d_max_in)
	{
	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	struct acpi_device *adev;

	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
	dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
	return -ENODEV;
	}

	return acpi_device_power_state(dev, adev, acpi_target_system_state(),
	d_max_in, d_min_p);
	}
	EXPORT_SYMBOL(acpi_pm_device_sleep_state);

	#ifdef CONFIG_PM_RUNTIME
	/**
	* __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
	* @adev: ACPI device to enable/disable the remote wakeup for.
	* @enable: Whether to enable or disable the wakeup functionality.
	*
	* Enable/disable the GPE associated with @adev so that it can generate
	* wakeup signals for the device in response to external (remote) events and
	* enable/disable device wakeup power.
	*
	* Callers must ensure that @adev is a valid ACPI device node before executing
	* this function.
	*/
	int __acpi_device_run_wake(struct acpi_device *adev, bool enable)
	{
	struct acpi_device_wakeup *wakeup = &adev->wakeup;

	if (enable) {
	acpi_status res;
	int error;

	error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0);
	if (error)
	return error;

	res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
	if (ACPI_FAILURE(res)) {
	acpi_disable_wakeup_device_power(adev);
	return -EIO;
	}
	} else {
	acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
	acpi_disable_wakeup_device_power(adev);
	}
	return 0;
	}

	/**
	* acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
	* @dev: Device to enable/disable the platform to wake up.
	* @enable: Whether to enable or disable the wakeup functionality.
	*/
	int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
	{
	struct acpi_device *adev;
	acpi_handle handle;

	if (!device_run_wake(phys_dev))
	return -EINVAL;

	handle = DEVICE_ACPI_HANDLE(phys_dev);
	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
	dev_dbg(phys_dev, "ACPI handle without context in %s!\n",
	__func__);
	return -ENODEV;
	}

	return __acpi_device_run_wake(adev, enable);
	}
	EXPORT_SYMBOL(acpi_pm_device_run_wake);
	#endif /* CONFIG_PM_RUNTIME */

	#ifdef CONFIG_PM_SLEEP
	/**
	* __acpi_device_sleep_wake - Enable or disable device to wake up the system.
	* @dev: Device to enable/desible to wake up the system.
	* @target_state: System state the device is supposed to wake up from.
	* @enable: Whether to enable or disable @dev to wake up the system.
	*/
	int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state,
	bool enable)
	{
	return enable ?
	acpi_enable_wakeup_device_power(adev, target_state) :
	acpi_disable_wakeup_device_power(adev);
	}

	/**
	* acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
	* @dev: Device to enable/desible to wake up the system from sleep states.
	* @enable: Whether to enable or disable @dev to wake up the system.
	*/
	int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
	{
	acpi_handle handle;
	struct acpi_device *adev;
	int error;

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

	handle = DEVICE_ACPI_HANDLE(dev);
	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
	dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
	return -ENODEV;
	}

	error = __acpi_device_sleep_wake(adev, acpi_target_system_state(),
	enable);
	if (!error)
	dev_info(dev, "System wakeup %s by ACPI\n",
	enable ? "enabled" : "disabled");

	return error;
	}
	#endif /* CONFIG_PM_SLEEP */