evxface.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/*******************************************************************************
 *
 * FUNCTION:    Acpi_remove_notify_handler
 *
 * PARAMETERS:  Device          - The device for which notifies will be handled
 *              Handler_type    - The type of handler:
 *                                  ACPI_SYSTEM_NOTIFY: System_handler (00-7f)
 *                                  ACPI_DEVICE_NOTIFY: Driver_handler (80-ff)
 *              Handler         - Address of the handler
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a handler for notifies on an ACPI device
 *
 ******************************************************************************/

acpi_status
acpi_remove_notify_handler (
	acpi_handle             device,
	u32                     handler_type,
	acpi_notify_handler     handler)
{
	acpi_operand_object     *notify_obj;
	acpi_operand_object     *obj_desc;
	acpi_namespace_node     *device_node;
	acpi_status             status = AE_OK;


	FUNCTION_TRACE ("Acpi_remove_notify_handler");


	/* Parameter validation */

	if ((!handler) ||
		(handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);

	/* Convert and validate the device handle */

	device_node = acpi_ns_map_handle_to_node (device);
	if (!device_node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/*
	 * Root Object
	 */
	if (device == ACPI_ROOT_OBJECT) {
		ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Removing notify handler for ROOT object.\n"));

		if (((handler_type == ACPI_SYSTEM_NOTIFY) &&
			  !acpi_gbl_sys_notify.handler) ||
			((handler_type == ACPI_DEVICE_NOTIFY) &&
			  !acpi_gbl_drv_notify.handler)) {
			status = AE_NOT_EXIST;
			goto unlock_and_exit;
		}

		if (handler_type == ACPI_SYSTEM_NOTIFY) {
			acpi_gbl_sys_notify.node  = NULL;
			acpi_gbl_sys_notify.handler = NULL;
			acpi_gbl_sys_notify.context = NULL;
		}
		else {
			acpi_gbl_drv_notify.node  = NULL;
			acpi_gbl_drv_notify.handler = NULL;
			acpi_gbl_drv_notify.context = NULL;
		}
	}

	/*
	 * All Other Objects
	 */
	else {
		/*
		 * These are the ONLY objects that can receive ACPI notifications
		 */
		if ((device_node->type != ACPI_TYPE_DEVICE)    &&
			(device_node->type != ACPI_TYPE_PROCESSOR) &&
			(device_node->type != ACPI_TYPE_POWER)     &&
			(device_node->type != ACPI_TYPE_THERMAL)) {
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}

		/* Check for an existing internal object */

		obj_desc = acpi_ns_get_attached_object (device_node);
		if (!obj_desc) {
			status = AE_NOT_EXIST;
			goto unlock_and_exit;
		}

		/* Object exists - make sure there's an existing handler */

		if (handler_type == ACPI_SYSTEM_NOTIFY) {
			notify_obj = obj_desc->device.sys_handler;
		}
		else {
			notify_obj = obj_desc->device.drv_handler;
		}

		if ((!notify_obj) ||
			(notify_obj->notify_handler.handler != handler)) {
			status = AE_BAD_PARAMETER;
			goto unlock_and_exit;
		}

		/* Remove the handler */

		if (handler_type == ACPI_SYSTEM_NOTIFY) {
			obj_desc->device.sys_handler = NULL;
		}
		else {
			obj_desc->device.drv_handler = NULL;
		}

		acpi_ut_remove_reference (notify_obj);
	}


unlock_and_exit:
	acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_install_gpe_handler
 *
 * PARAMETERS:  Gpe_number      - The GPE number.  The numbering scheme is
 *                                bank 0 first, then bank 1.
 *              Type            - Whether this GPE should be treated as an
 *                                edge- or level-triggered interrupt.
 *              Handler         - Address of the handler
 *              Context         - Value passed to the handler on each GPE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Install a handler for a General Purpose Event.
 *
 ******************************************************************************/

acpi_status
acpi_install_gpe_handler (
	u32                     gpe_number,
	u32                     type,
	acpi_gpe_handler        handler,
	void                    *context)
{
	acpi_status             status = AE_OK;


	FUNCTION_TRACE ("Acpi_install_gpe_handler");


	/* Parameter validation */

	if (!handler || (gpe_number > ACPI_GPE_MAX)) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

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

	if (acpi_gbl_gpe_valid[gpe_number] == ACPI_GPE_INVALID) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

	/* Make sure that there isn't a handler there already */

	if (acpi_gbl_gpe_info[gpe_number].handler) {
		status = AE_EXIST;
		goto cleanup;
	}

	/* Install the handler */

	acpi_gbl_gpe_info[gpe_number].handler = handler;
	acpi_gbl_gpe_info[gpe_number].context = context;
	acpi_gbl_gpe_info[gpe_number].type = (u8) type;

	/* Clear the GPE (of stale events), the enable it */

	acpi_hw_clear_gpe (gpe_number);
	acpi_hw_enable_gpe (gpe_number);


cleanup:
	acpi_ut_release_mutex (ACPI_MTX_EVENTS);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_remove_gpe_handler
 *
 * PARAMETERS:  Gpe_number      - The event to remove a handler
 *              Handler         - Address of the handler
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a handler for a General Purpose Acpi_event.
 *
 ******************************************************************************/

acpi_status
acpi_remove_gpe_handler (
	u32                     gpe_number,
	acpi_gpe_handler        handler)
{
	acpi_status             status = AE_OK;


	FUNCTION_TRACE ("Acpi_remove_gpe_handler");


	/* Parameter validation */

	if (!handler || (gpe_number > ACPI_GPE_MAX)) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

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

	if (acpi_gbl_gpe_valid[gpe_number] == ACPI_GPE_INVALID) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/* Disable the GPE before removing the handler */

	acpi_hw_disable_gpe (gpe_number);

	acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);

	/* Make sure that the installed handler is the same */

	if (acpi_gbl_gpe_info[gpe_number].handler != handler) {
		acpi_hw_enable_gpe (gpe_number);
		status = AE_BAD_PARAMETER;
		goto cleanup;
	}

	/* Remove the handler */

	acpi_gbl_gpe_info[gpe_number].handler = NULL;
	acpi_gbl_gpe_info[gpe_number].context = NULL;


cleanup:
	acpi_ut_release_mutex (ACPI_MTX_EVENTS);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_acquire_global_lock
 *
 * PARAMETERS:  Timeout         - How long the caller is willing to wait
 *              Out_handle      - A handle to the lock if acquired
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Acquire the ACPI Global Lock
 *
 ******************************************************************************/

acpi_status
acpi_acquire_global_lock (
	void)
{
	acpi_status             status;


	status = acpi_ex_enter_interpreter ();
	if (ACPI_FAILURE (status)) {
		return (status);
	}

	/*
	 * TBD: [Restructure] add timeout param to internal interface, and
	 * perhaps INTERPRETER_LOCKED
	 */
	status = acpi_ev_acquire_global_lock ();
	acpi_ex_exit_interpreter ();

	return (status);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_release_global_lock
 *
 * PARAMETERS:  Handle      - Returned from Acpi_acquire_global_lock
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Release the ACPI Global Lock
 *
 ******************************************************************************/

acpi_status
acpi_release_global_lock (
	void)
{

	acpi_ev_release_global_lock ();
	return (AE_OK);
}