evxfevnt.c

h内核

	ACPI_FUNCTION_TRACE ("acpi_disable_event");


	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * Disable the requested fixed event (by writing a zero to the
	 * enable register bit)
	 */
	status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
			 0, ACPI_MTX_LOCK);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
			 &value, ACPI_MTX_LOCK);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	if (value != 0) {
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Could not disable %s events\n", acpi_ut_get_event_name (event)));
		return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
	}

	return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_disable_event);


/*******************************************************************************
 *
 * FUNCTION:    acpi_clear_event
 *
 * PARAMETERS:  Event           - The fixed event to be cleared
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear an ACPI event (fixed)
 *
 ******************************************************************************/

acpi_status
acpi_clear_event (
	u32                             event)
{
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("acpi_clear_event");


	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * Clear the requested fixed event (By writing a one to the
	 * status register bit)
	 */
	status = acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,
			1, ACPI_MTX_LOCK);

	return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_clear_event);


/*******************************************************************************
 *
 * FUNCTION:    acpi_clear_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Called from an ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear an ACPI event (general purpose)
 *
 ******************************************************************************/

acpi_status
acpi_clear_gpe (
	acpi_handle                     gpe_device,
	u32                             gpe_number,
	u32                             flags)
{
	acpi_status                     status = AE_OK;
	struct acpi_gpe_event_info      *gpe_event_info;


	ACPI_FUNCTION_TRACE ("acpi_clear_gpe");


	/* Use semaphore lock if not executing at interrupt level */

	if (flags & ACPI_NOT_ISR) {
		status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_hw_clear_gpe (gpe_event_info);

unlock_and_exit:
	if (flags & ACPI_NOT_ISR) {
		(void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS (status);
}


#ifdef ACPI_FUTURE_USAGE

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_event_status
 *
 * PARAMETERS:  Event           - The fixed event
 *              Event Status    - Where the current status of the event will
 *                                be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtains and returns the current status of the event
 *
 ******************************************************************************/

acpi_status
acpi_get_event_status (
	u32                             event,
	acpi_event_status               *event_status)
{
	acpi_status                     status = AE_OK;


	ACPI_FUNCTION_TRACE ("acpi_get_event_status");


	if (!event_status) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* Get the status of the requested fixed event */

	status = acpi_get_register (acpi_gbl_fixed_event_info[event].status_register_id,
			  event_status, ACPI_MTX_LOCK);

	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_get_gpe_status
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Called from an ISR or not
 *              Event Status    - Where the current status of the event will
 *                                be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get status of an event (general purpose)
 *
 ******************************************************************************/

acpi_status
acpi_get_gpe_status (
	acpi_handle                     gpe_device,
	u32                             gpe_number,
	u32                             flags,
	acpi_event_status               *event_status)
{
	acpi_status                     status = AE_OK;
	struct acpi_gpe_event_info      *gpe_event_info;


	ACPI_FUNCTION_TRACE ("acpi_get_gpe_status");


	/* Use semaphore lock if not executing at interrupt level */

	if (flags & ACPI_NOT_ISR) {
		status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
		if (ACPI_FAILURE (status)) {
			return_ACPI_STATUS (status);
		}
	}

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Obtain status on the requested GPE number */

	status = acpi_hw_get_gpe_status (gpe_event_info, event_status);

unlock_and_exit:
	if (flags & ACPI_NOT_ISR) {
		(void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS (status);
}
#endif  /*  ACPI_FUTURE_USAGE  */


/*******************************************************************************
 *
 * FUNCTION:    acpi_install_gpe_block
 *
 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 *              gpe_block_address   - Address and space_iD
 *              register_count      - Number of GPE register pairs in the block
 *              interrupt_level     - H/W interrupt for the block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create and Install a block of GPE registers
 *
 ******************************************************************************/

acpi_status
acpi_install_gpe_block (
	acpi_handle                     gpe_device,
	struct acpi_generic_address     *gpe_block_address,
	u32                             register_count,
	u32                             interrupt_level)
{
	acpi_status                     status;
	union acpi_operand_object       *obj_desc;
	struct acpi_namespace_node      *node;
	struct acpi_gpe_block_info      *gpe_block;


	ACPI_FUNCTION_TRACE ("acpi_install_gpe_block");


	if ((!gpe_device)      ||
		(!gpe_block_address) ||
		(!register_count)) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	node = acpi_ns_map_handle_to_node (gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/*
	 * For user-installed GPE Block Devices, the gpe_block_base_number
	 * is always zero
	 */
	status = acpi_ev_create_gpe_block (node, gpe_block_address, register_count,
			  0, interrupt_level, &gpe_block);
	if (ACPI_FAILURE (status)) {
		goto unlock_and_exit;
	}

	/* Get the device_object attached to the node */

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc) {
		/* No object, create a new one */

		obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_DEVICE);
		if (!obj_desc) {
			status = AE_NO_MEMORY;
			goto unlock_and_exit;
		}

		status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_DEVICE);

		/* Remove local reference to the object */

		acpi_ut_remove_reference (obj_desc);

		if (ACPI_FAILURE (status)) {
			goto unlock_and_exit;
		}
	}

	/* Install the GPE block in the device_object */

	obj_desc->device.gpe_block = gpe_block;


unlock_and_exit:
	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_install_gpe_block);


/*******************************************************************************
 *
 * FUNCTION:    acpi_remove_gpe_block
 *
 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a previously installed block of GPE registers
 *
 ******************************************************************************/

acpi_status
acpi_remove_gpe_block (
	acpi_handle                     gpe_device)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status;
	struct acpi_namespace_node      *node;


	ACPI_FUNCTION_TRACE ("acpi_remove_gpe_block");


	if (!gpe_device) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	node = acpi_ns_map_handle_to_node (gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Get the device_object attached to the node */

	obj_desc = acpi_ns_get_attached_object (node);
	if (!obj_desc ||
		!obj_desc->device.gpe_block) {
		return_ACPI_STATUS (AE_NULL_OBJECT);
	}

	/* Delete the GPE block (but not the device_object) */

	status = acpi_ev_delete_gpe_block (obj_desc->device.gpe_block);
	if (ACPI_SUCCESS (status)) {
		obj_desc->device.gpe_block = NULL;
	}

unlock_and_exit:
	(void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_remove_gpe_block);