Commit 9ce4e607 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / PM: Move device power management functions to device_pm.c 



Move ACPI device power management functions from drivers/acpi/bus.c
to drivers/acpi/device_pm.c.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 96bfd3ce

drivers/acpi/bus.c

+0 −293
Original line number Diff line number Diff line
@@ -178,299 +178,6 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data) 
}

EXPORT_SYMBOL(acpi_bus_get_private_data);



/* --------------------------------------------------------------------------

                                 Power Management

   -------------------------------------------------------------------------- */



/**

 * acpi_power_state_string - String representation of ACPI device power state.

 * @state: ACPI device power state to return the string representation of.

 */

const char *acpi_power_state_string(int state)

{

	switch (state) {

	case ACPI_STATE_D0:

		return "D0";

	case ACPI_STATE_D1:

		return "D1";

	case ACPI_STATE_D2:

		return "D2";

	case ACPI_STATE_D3_HOT:

		return "D3hot";

	case ACPI_STATE_D3_COLD:

		return "D3";

	default:

		return "(unknown)";

	}

}



/**

 * acpi_device_get_power - Get power state of an ACPI device.

 * @device: Device to get the power state of.

 * @state: Place to store the power state of the device.

 *

 * This function does not update the device's power.state field, but it may

 * update its parent's power.state field (when the parent's power state is

 * unknown and the device's power state turns out to be D0).

 */

int acpi_device_get_power(struct acpi_device *device, int *state)

{

	int result = ACPI_STATE_UNKNOWN;



	if (!device || !state)

		return -EINVAL;



	if (!device->flags.power_manageable) {

		/* TBD: Non-recursive algorithm for walking up hierarchy. */

		*state = device->parent ?

			device->parent->power.state : ACPI_STATE_D0;

		goto out;

	}



	/*

	 * Get the device's power state either directly (via _PSC) or

	 * indirectly (via power resources).

	 */

	if (device->power.flags.explicit_get) {

		unsigned long long psc;

		acpi_status status = acpi_evaluate_integer(device->handle,

							   "_PSC", NULL, &psc);

		if (ACPI_FAILURE(status))

			return -ENODEV;



		result = psc;

	}

	/* The test below covers ACPI_STATE_UNKNOWN too. */

	if (result <= ACPI_STATE_D2) {

	  ; /* Do nothing. */

	} else if (device->power.flags.power_resources) {

		int error = acpi_power_get_inferred_state(device, &result);

		if (error)

			return error;

	} else if (result == ACPI_STATE_D3_HOT) {

		result = ACPI_STATE_D3;

	}



	/*

	 * If we were unsure about the device parent's power state up to this

	 * point, the fact that the device is in D0 implies that the parent has

	 * to be in D0 too.

	 */

	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN

	    && result == ACPI_STATE_D0)

		device->parent->power.state = ACPI_STATE_D0;



	*state = result;



 out:

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",

			  device->pnp.bus_id, acpi_power_state_string(*state)));



	return 0;

}





/**

 * acpi_device_set_power - Set power state of an ACPI device.

 * @device: Device to set the power state of.

 * @state: New power state to set.

 *

 * Callers must ensure that the device is power manageable before using this

 * function.

 */

int acpi_device_set_power(struct acpi_device *device, int state)

{

	int result = 0;

	acpi_status status = AE_OK;

	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };

	bool cut_power = false;



	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))

		return -EINVAL;



	/* Make sure this is a valid target state */



	if (state == device->power.state) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",

				  acpi_power_state_string(state)));

		return 0;

	}



	if (!device->power.states[state].flags.valid) {

		printk(KERN_WARNING PREFIX "Device does not support %s\n",

		       acpi_power_state_string(state));

		return -ENODEV;

	}

	if (device->parent && (state < device->parent->power.state)) {

		printk(KERN_WARNING PREFIX

			      "Cannot set device to a higher-powered"

			      " state than parent\n");

		return -ENODEV;

	}



	/* For D3cold we should first transition into D3hot. */

	if (state == ACPI_STATE_D3_COLD

	    && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {

		state = ACPI_STATE_D3_HOT;

		object_name[3] = '3';

		cut_power = true;

	}



	/*

	 * Transition Power

	 * ----------------

	 * On transitions to a high-powered state we first apply power (via

	 * power resources) then evalute _PSx.  Conversly for transitions to

	 * a lower-powered state.

	 */

	if (state < device->power.state) {

		if (device->power.state >= ACPI_STATE_D3_HOT &&

		    state != ACPI_STATE_D0) {

			printk(KERN_WARNING PREFIX

			      "Cannot transition to non-D0 state from D3\n");

			return -ENODEV;

		}

		if (device->power.flags.power_resources) {

			result = acpi_power_transition(device, state);

			if (result)

				goto end;

		}

		if (device->power.states[state].flags.explicit_set) {

			status = acpi_evaluate_object(device->handle,

						      object_name, NULL, NULL);

			if (ACPI_FAILURE(status)) {

				result = -ENODEV;

				goto end;

			}

		}

	} else {

		if (device->power.states[state].flags.explicit_set) {

			status = acpi_evaluate_object(device->handle,

						      object_name, NULL, NULL);

			if (ACPI_FAILURE(status)) {

				result = -ENODEV;

				goto end;

			}

		}

		if (device->power.flags.power_resources) {

			result = acpi_power_transition(device, state);

			if (result)

				goto end;

		}

	}



	if (cut_power)

		result = acpi_power_transition(device, ACPI_STATE_D3_COLD);



      end:

	if (result)

		printk(KERN_WARNING PREFIX

			      "Device [%s] failed to transition to %s\n",

			      device->pnp.bus_id,

			      acpi_power_state_string(state));

	else {

		device->power.state = state;

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Device [%s] transitioned to %s\n",

				  device->pnp.bus_id,

				  acpi_power_state_string(state)));

	}



	return result;

}

EXPORT_SYMBOL(acpi_device_set_power);





int acpi_bus_set_power(acpi_handle handle, int state)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	if (result)

		return result;



	if (!device->flags.power_manageable) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				"Device [%s] is not power manageable\n",

				dev_name(&device->dev)));

		return -ENODEV;

	}



	return acpi_device_set_power(device, state);

}

EXPORT_SYMBOL(acpi_bus_set_power);





int acpi_bus_init_power(struct acpi_device *device)

{

	int state;

	int result;



	if (!device)

		return -EINVAL;



	device->power.state = ACPI_STATE_UNKNOWN;



	result = acpi_device_get_power(device, &state);

	if (result)

		return result;



	if (device->power.flags.power_resources)

		result = acpi_power_on_resources(device, state);



	if (!result)

		device->power.state = state;



	return result;

}





int acpi_bus_update_power(acpi_handle handle, int *state_p)

{

	struct acpi_device *device;

	int state;

	int result;



	result = acpi_bus_get_device(handle, &device);

	if (result)

		return result;



	result = acpi_device_get_power(device, &state);

	if (result)

		return result;



	result = acpi_device_set_power(device, state);

	if (!result && state_p)

		*state_p = state;



	return result;

}

EXPORT_SYMBOL_GPL(acpi_bus_update_power);





bool acpi_bus_power_manageable(acpi_handle handle)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	return result ? false : device->flags.power_manageable;

}



EXPORT_SYMBOL(acpi_bus_power_manageable);



bool acpi_bus_can_wakeup(acpi_handle handle)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	return result ? false : device->wakeup.flags.valid;

}



EXPORT_SYMBOL(acpi_bus_can_wakeup);



static void acpi_print_osc_error(acpi_handle handle,

	struct acpi_osc_context *context, char *error)

{

drivers/acpi/device_pm.c

+288 −0
Original line number Diff line number Diff line
@@ -30,6 +30,12 @@ 


#include <acpi/acpi.h>

#include <acpi/acpi_bus.h>

#include <acpi/acpi_drivers.h>



#include "internal.h"



#define _COMPONENT	ACPI_POWER_COMPONENT

ACPI_MODULE_NAME("device_pm");



static DEFINE_MUTEX(acpi_pm_notifier_lock);
@@ -93,6 +99,288 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev, 
	return status;

}



/**

 * acpi_power_state_string - String representation of ACPI device power state.

 * @state: ACPI device power state to return the string representation of.

 */

const char *acpi_power_state_string(int state)

{

	switch (state) {

	case ACPI_STATE_D0:

		return "D0";

	case ACPI_STATE_D1:

		return "D1";

	case ACPI_STATE_D2:

		return "D2";

	case ACPI_STATE_D3_HOT:

		return "D3hot";

	case ACPI_STATE_D3_COLD:

		return "D3";

	default:

		return "(unknown)";

	}

}



/**

 * acpi_device_get_power - Get power state of an ACPI device.

 * @device: Device to get the power state of.

 * @state: Place to store the power state of the device.

 *

 * This function does not update the device's power.state field, but it may

 * update its parent's power.state field (when the parent's power state is

 * unknown and the device's power state turns out to be D0).

 */

int acpi_device_get_power(struct acpi_device *device, int *state)

{

	int result = ACPI_STATE_UNKNOWN;



	if (!device || !state)

		return -EINVAL;



	if (!device->flags.power_manageable) {

		/* TBD: Non-recursive algorithm for walking up hierarchy. */

		*state = device->parent ?

			device->parent->power.state : ACPI_STATE_D0;

		goto out;

	}



	/*

	 * Get the device's power state either directly (via _PSC) or

	 * indirectly (via power resources).

	 */

	if (device->power.flags.explicit_get) {

		unsigned long long psc;

		acpi_status status = acpi_evaluate_integer(device->handle,

							   "_PSC", NULL, &psc);

		if (ACPI_FAILURE(status))

			return -ENODEV;



		result = psc;

	}

	/* The test below covers ACPI_STATE_UNKNOWN too. */

	if (result <= ACPI_STATE_D2) {

	  ; /* Do nothing. */

	} else if (device->power.flags.power_resources) {

		int error = acpi_power_get_inferred_state(device, &result);

		if (error)

			return error;

	} else if (result == ACPI_STATE_D3_HOT) {

		result = ACPI_STATE_D3;

	}



	/*

	 * If we were unsure about the device parent's power state up to this

	 * point, the fact that the device is in D0 implies that the parent has

	 * to be in D0 too.

	 */

	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN

	    && result == ACPI_STATE_D0)

		device->parent->power.state = ACPI_STATE_D0;



	*state = result;



 out:

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",

			  device->pnp.bus_id, acpi_power_state_string(*state)));



	return 0;

}



/**

 * acpi_device_set_power - Set power state of an ACPI device.

 * @device: Device to set the power state of.

 * @state: New power state to set.

 *

 * Callers must ensure that the device is power manageable before using this

 * function.

 */

int acpi_device_set_power(struct acpi_device *device, int state)

{

	int result = 0;

	acpi_status status = AE_OK;

	char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };

	bool cut_power = false;



	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))

		return -EINVAL;



	/* Make sure this is a valid target state */



	if (state == device->power.state) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",

				  acpi_power_state_string(state)));

		return 0;

	}



	if (!device->power.states[state].flags.valid) {

		printk(KERN_WARNING PREFIX "Device does not support %s\n",

		       acpi_power_state_string(state));

		return -ENODEV;

	}

	if (device->parent && (state < device->parent->power.state)) {

		printk(KERN_WARNING PREFIX

			      "Cannot set device to a higher-powered"

			      " state than parent\n");

		return -ENODEV;

	}



	/* For D3cold we should first transition into D3hot. */

	if (state == ACPI_STATE_D3_COLD

	    && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {

		state = ACPI_STATE_D3_HOT;

		object_name[3] = '3';

		cut_power = true;

	}



	/*

	 * Transition Power

	 * ----------------

	 * On transitions to a high-powered state we first apply power (via

	 * power resources) then evalute _PSx.  Conversly for transitions to

	 * a lower-powered state.

	 */

	if (state < device->power.state) {

		if (device->power.state >= ACPI_STATE_D3_HOT &&

		    state != ACPI_STATE_D0) {

			printk(KERN_WARNING PREFIX

			      "Cannot transition to non-D0 state from D3\n");

			return -ENODEV;

		}

		if (device->power.flags.power_resources) {

			result = acpi_power_transition(device, state);

			if (result)

				goto end;

		}

		if (device->power.states[state].flags.explicit_set) {

			status = acpi_evaluate_object(device->handle,

						      object_name, NULL, NULL);

			if (ACPI_FAILURE(status)) {

				result = -ENODEV;

				goto end;

			}

		}

	} else {

		if (device->power.states[state].flags.explicit_set) {

			status = acpi_evaluate_object(device->handle,

						      object_name, NULL, NULL);

			if (ACPI_FAILURE(status)) {

				result = -ENODEV;

				goto end;

			}

		}

		if (device->power.flags.power_resources) {

			result = acpi_power_transition(device, state);

			if (result)

				goto end;

		}

	}



	if (cut_power)

		result = acpi_power_transition(device, ACPI_STATE_D3_COLD);



      end:

	if (result)

		printk(KERN_WARNING PREFIX

			      "Device [%s] failed to transition to %s\n",

			      device->pnp.bus_id,

			      acpi_power_state_string(state));

	else {

		device->power.state = state;

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Device [%s] transitioned to %s\n",

				  device->pnp.bus_id,

				  acpi_power_state_string(state)));

	}



	return result;

}

EXPORT_SYMBOL(acpi_device_set_power);



int acpi_bus_set_power(acpi_handle handle, int state)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	if (result)

		return result;



	if (!device->flags.power_manageable) {

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				"Device [%s] is not power manageable\n",

				dev_name(&device->dev)));

		return -ENODEV;

	}



	return acpi_device_set_power(device, state);

}

EXPORT_SYMBOL(acpi_bus_set_power);



int acpi_bus_init_power(struct acpi_device *device)

{

	int state;

	int result;



	if (!device)

		return -EINVAL;



	device->power.state = ACPI_STATE_UNKNOWN;



	result = acpi_device_get_power(device, &state);

	if (result)

		return result;



	if (device->power.flags.power_resources)

		result = acpi_power_on_resources(device, state);



	if (!result)

		device->power.state = state;



	return result;

}



int acpi_bus_update_power(acpi_handle handle, int *state_p)

{

	struct acpi_device *device;

	int state;

	int result;



	result = acpi_bus_get_device(handle, &device);

	if (result)

		return result;



	result = acpi_device_get_power(device, &state);

	if (result)

		return result;



	result = acpi_device_set_power(device, state);

	if (!result && state_p)

		*state_p = state;



	return result;

}

EXPORT_SYMBOL_GPL(acpi_bus_update_power);



bool acpi_bus_power_manageable(acpi_handle handle)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	return result ? false : device->flags.power_manageable;

}

EXPORT_SYMBOL(acpi_bus_power_manageable);



bool acpi_bus_can_wakeup(acpi_handle handle)

{

	struct acpi_device *device;

	int result;



	result = acpi_bus_get_device(handle, &device);

	return result ? false : device->wakeup.flags.valid;

}

EXPORT_SYMBOL(acpi_bus_can_wakeup);



/**

 * acpi_device_power_state - Get preferred power state of ACPI device.

 * @dev: Device whose preferred target power state to return.

drivers/acpi/internal.h

+0 −1
Original line number Diff line number Diff line
@@ -61,7 +61,6 @@ int acpi_device_sleep_wake(struct acpi_device *dev, 
int acpi_power_get_inferred_state(struct acpi_device *device, int *state);

int acpi_power_on_resources(struct acpi_device *device, int state);

int acpi_power_transition(struct acpi_device *device, int state);

int acpi_bus_init_power(struct acpi_device *device);



int acpi_wakeup_device_init(void);

void acpi_early_processor_set_pdc(void);

include/acpi/acpi_bus.h

+38 −0
Original line number Diff line number Diff line
@@ -330,13 +330,51 @@ void acpi_bus_data_handler(acpi_handle handle, void *context); 
acpi_status acpi_bus_get_status_handle(acpi_handle handle,

				       unsigned long long *sta);

int acpi_bus_get_status(struct acpi_device *device);



#ifdef CONFIG_PM

int acpi_bus_set_power(acpi_handle handle, int state);

const char *acpi_power_state_string(int state);

int acpi_device_get_power(struct acpi_device *device, int *state);

int acpi_device_set_power(struct acpi_device *device, int state);

int acpi_bus_init_power(struct acpi_device *device);

int acpi_bus_update_power(acpi_handle handle, int *state_p);

bool acpi_bus_power_manageable(acpi_handle handle);

bool acpi_bus_can_wakeup(acpi_handle handle);

#else /* !CONFIG_PM */

static inline int acpi_bus_set_power(acpi_handle handle, int state)

{

	return 0;

}

static inline const char *acpi_power_state_string(int state)

{

	return "D0";

}

static inline int acpi_device_get_power(struct acpi_device *device, int *state)

{

	return 0;

}

static inline int acpi_device_set_power(struct acpi_device *device, int state)

{

	return 0;

}

static inline int acpi_bus_init_power(struct acpi_device *device)

{

	return 0;

}

static inline int acpi_bus_update_power(acpi_handle handle, int *state_p)

{

	return 0;

}

static inline bool acpi_bus_power_manageable(acpi_handle handle)

{

	return false;

}

static inline bool acpi_bus_can_wakeup(acpi_handle handle)

{

	return false;

}

#endif /* !CONFIG_PM */



#ifdef CONFIG_ACPI_PROC_EVENT

int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data);

int acpi_bus_generate_proc_event4(const char *class, const char *bid, u8 type, int data);

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