uteval.c

h内核

	status = acpi_ut_evaluate_object (device_node, METHOD_NAME__HID,
			 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING, &obj_desc);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
		/* Convert the Numeric HID to string */

		acpi_ex_eisa_id_to_string ((u32) obj_desc->integer.value, hid->value);
	}
	else {
		/* Copy the String HID from the returned object */

		acpi_ut_copy_id_string (hid->value, obj_desc->string.pointer,
				sizeof (hid->value));
	}

	/* On exit, we must delete the return object */

	acpi_ut_remove_reference (obj_desc);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_translate_one_cid
 *
 * PARAMETERS:  obj_desc            - _CID object, must be integer or string
 *              one_cid             - Where the CID string is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Return a numeric or string _CID value as a string.
 *              (Compatible ID)
 *
 *              NOTE:  Assumes a maximum _CID string length of
 *                     ACPI_MAX_CID_LENGTH.
 *
 ******************************************************************************/

static acpi_status
acpi_ut_translate_one_cid (
	union acpi_operand_object       *obj_desc,
	struct acpi_compatible_id       *one_cid)
{


	switch (ACPI_GET_OBJECT_TYPE (obj_desc)) {
	case ACPI_TYPE_INTEGER:

		/* Convert the Numeric CID to string */

		acpi_ex_eisa_id_to_string ((u32) obj_desc->integer.value, one_cid->value);
		return (AE_OK);

	case ACPI_TYPE_STRING:

		if (obj_desc->string.length > ACPI_MAX_CID_LENGTH) {
			return (AE_AML_STRING_LIMIT);
		}

		/* Copy the String CID from the returned object */

		acpi_ut_copy_id_string (one_cid->value, obj_desc->string.pointer,
				ACPI_MAX_CID_LENGTH);
		return (AE_OK);

	default:

		return (AE_TYPE);
	}
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_CID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              *Cid                - Where the CID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _CID control method that returns one or more
 *              compatible hardware IDs for the device.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_CID (
	struct acpi_namespace_node      *device_node,
	struct acpi_compatible_id_list **return_cid_list)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status;
	u32                             count;
	u32                             size;
	struct acpi_compatible_id_list *cid_list;
	acpi_native_uint                i;


	ACPI_FUNCTION_TRACE ("ut_execute_CID");


	/* Evaluate the _CID method for this device */

	status = acpi_ut_evaluate_object (device_node, METHOD_NAME__CID,
			 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING | ACPI_BTYPE_PACKAGE,
			 &obj_desc);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	/* Get the number of _CIDs returned */

	count = 1;
	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_PACKAGE) {
		count = obj_desc->package.count;
	}

	/* Allocate a worst-case buffer for the _CIDs */

	size = (((count - 1) * sizeof (struct acpi_compatible_id)) +
			   sizeof (struct acpi_compatible_id_list));

	cid_list = ACPI_MEM_CALLOCATE ((acpi_size) size);
	if (!cid_list) {
		return_ACPI_STATUS (AE_NO_MEMORY);
	}

	/* Init CID list */

	cid_list->count = count;
	cid_list->size = size;

	/*
	 *  A _CID can return either a single compatible ID or a package of compatible
	 *  IDs.  Each compatible ID can be one of the following:
	 *  -- Number (32 bit compressed EISA ID) or
	 *  -- String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss").
	 */

	/* The _CID object can be either a single CID or a package (list) of CIDs */

	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_PACKAGE) {
		/* Translate each package element */

		for (i = 0; i < count; i++) {
			status = acpi_ut_translate_one_cid (obj_desc->package.elements[i],
					  &cid_list->id[i]);
			if (ACPI_FAILURE (status)) {
				break;
			}
		}
	}
	else {
		/* Only one CID, translate to a string */

		status = acpi_ut_translate_one_cid (obj_desc, cid_list->id);
	}

	/* Cleanup on error */

	if (ACPI_FAILURE (status)) {
		ACPI_MEM_FREE (cid_list);
	}
	else {
		*return_cid_list = cid_list;
	}

	/* On exit, we must delete the _CID return object */

	acpi_ut_remove_reference (obj_desc);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_UID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              *Uid                - Where the UID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _UID control method that returns the hardware
 *              ID of the device.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_UID (
	struct acpi_namespace_node      *device_node,
	struct acpi_device_id           *uid)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ut_execute_UID");


	status = acpi_ut_evaluate_object (device_node, METHOD_NAME__UID,
			 ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING, &obj_desc);
	if (ACPI_FAILURE (status)) {
		return_ACPI_STATUS (status);
	}

	if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_INTEGER) {
		/* Convert the Numeric UID to string */

		acpi_ex_unsigned_integer_to_string (obj_desc->integer.value, uid->value);
	}
	else {
		/* Copy the String UID from the returned object */

		acpi_ut_copy_id_string (uid->value, obj_desc->string.pointer,
				sizeof (uid->value));
	}

	/* On exit, we must delete the return object */

	acpi_ut_remove_reference (obj_desc);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_STA
 *
 * PARAMETERS:  device_node         - Node for the device
 *              *Flags              - Where the status flags are returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes _STA for selected device and stores results in
 *              *Flags.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_STA (
	struct acpi_namespace_node      *device_node,
	u32                             *flags)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status;


	ACPI_FUNCTION_TRACE ("ut_execute_STA");


	status = acpi_ut_evaluate_object (device_node, METHOD_NAME__STA,
			 ACPI_BTYPE_INTEGER, &obj_desc);
	if (ACPI_FAILURE (status)) {
		if (AE_NOT_FOUND == status) {
			ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
				"_STA on %4.4s was not found, assuming device is present\n",
				acpi_ut_get_node_name (device_node)));

			*flags = 0x0F;
			status = AE_OK;
		}

		return_ACPI_STATUS (status);
	}

	/* Extract the status flags */

	*flags = (u32) obj_desc->integer.value;

	/* On exit, we must delete the return object */

	acpi_ut_remove_reference (obj_desc);
	return_ACPI_STATUS (status);
}


/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_Sxds
 *
 * PARAMETERS:  device_node         - Node for the device
 *              *Flags              - Where the status flags are returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes _STA for selected device and stores results in
 *              *Flags.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_sxds (
	struct acpi_namespace_node      *device_node,
	u8                              *highest)
{
	union acpi_operand_object       *obj_desc;
	acpi_status                     status;
	u32                             i;


	ACPI_FUNCTION_TRACE ("ut_execute_Sxds");


	for (i = 0; i < 4; i++) {
		highest[i] = 0xFF;
		status = acpi_ut_evaluate_object (device_node,
				 (char *) acpi_gbl_highest_dstate_names[i],
				 ACPI_BTYPE_INTEGER, &obj_desc);
		if (ACPI_FAILURE (status)) {
			if (status != AE_NOT_FOUND) {
				ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
					"%s on Device %4.4s, %s\n",
					(char *) acpi_gbl_highest_dstate_names[i],
					acpi_ut_get_node_name (device_node),
					acpi_format_exception (status)));

				return_ACPI_STATUS (status);
			}
		}
		else {
			/* Extract the Dstate value */

			highest[i] = (u8) obj_desc->integer.value;

			/* Delete the return object */

			acpi_ut_remove_reference (obj_desc);
		}
	}

	return_ACPI_STATUS (AE_OK);
}