Commit 86b3832c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / PM: Move device power state selection routine to device_pm.c 



The ACPI function for choosing device power state is now located
in drivers/acpi/sleep.c, but drivers/acpi/device_pm.c is a more
logical place for it, so move it there.

However, instead of moving the function entirely, move its core only
under a different name and with a different list of arguments, so
that it is more flexible, and leave a wrapper around it in the
original location.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent ec2cd81c

drivers/acpi/device_pm.c

+107 −0
Original line number Diff line number Diff line
@@ -23,7 +23,9 @@ 
 */



#include <linux/device.h>

#include <linux/export.h>

#include <linux/mutex.h>

#include <linux/pm_qos.h>



#include <acpi/acpi.h>

#include <acpi/acpi_bus.h>
@@ -89,3 +91,108 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, 
	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);

drivers/acpi/sleep.c

+3 −85
Original line number Diff line number Diff line
@@ -19,7 +19,6 @@ 
#include <linux/acpi.h>

#include <linux/module.h>

#include <linux/pm_runtime.h>

#include <linux/pm_qos.h>



#include <asm/io.h>
@@ -691,101 +690,20 @@ int acpi_suspend(u32 acpi_state) 
 * 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 sleep state represented

 * by %acpi_target_sleep_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.

 *

 * 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;

	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 (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {

		printk(KERN_DEBUG "ACPI handle has no context!\n");

		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);

		return -ENODEV;

	}

	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' + acpi_target_sleep_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 (acpi_target_sleep_state > ACPI_STATE_S0) {

		acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);

		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid

			&& adev->wakeup.sleep_state >= acpi_target_sleep_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(handle, acpi_method, NULL,

						&d_max);

		if (ACPI_FAILURE(status)) {

			if (acpi_target_sleep_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;

	return acpi_device_power_state(dev, adev, acpi_target_sleep_state,

				       d_max_in, d_min_p);

}

EXPORT_SYMBOL(acpi_pm_device_sleep_state);

#endif /* CONFIG_PM */

include/acpi/acpi_bus.h

+14 −1
Original line number Diff line number Diff line
@@ -420,6 +420,8 @@ acpi_status acpi_add_pm_notifier(struct acpi_device *adev, 
				 acpi_notify_handler handler, void *context);

acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,

				    acpi_notify_handler handler);

int acpi_device_power_state(struct device *dev, struct acpi_device *adev,

			    u32 target_state, int d_max_in, int *d_min_p);

int acpi_pm_device_sleep_state(struct device *, int *, int);

#else

static inline acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
@@ -433,12 +435,23 @@ static inline acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, 
{

	return AE_SUPPORT;

}

static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)

static inline int __acpi_device_power_state(int m, int *p)

{

	if (p)

		*p = ACPI_STATE_D0;

	return (m >= ACPI_STATE_D0 && m <= ACPI_STATE_D3) ? m : ACPI_STATE_D0;

}

static inline int acpi_device_power_state(struct device *dev,

					  struct acpi_device *adev,

					  u32 target_state, int d_max_in,

					  int *d_min_p)

{

	return __acpi_device_power_state(d_max_in, d_min_p);

}

static inline int acpi_pm_device_sleep_state(struct device *d, int *p, int m)

{

	return __acpi_device_power_state(m, p);

}

#endif



#ifdef CONFIG_PM_RUNTIME

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