Linux 2.6.19-rc1

[linux-2.6/next.git] / drivers / acpi / utilities / uteval.c

/******************************************************************************
 *
 * Module Name: uteval - Object evaluation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2006, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/acinterp.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("uteval")

/* Local prototypes */
static void
acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length);

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

/*
 * Strings supported by the _OSI predefined (internal) method.
 */
static const char *acpi_interfaces_supported[] = {
        /* Operating System Vendor Strings */

        "Linux",
        "Windows 2000",
        "Windows 2001",
        "Windows 2001 SP0",
        "Windows 2001 SP1",
        "Windows 2001 SP2",
        "Windows 2001 SP3",
        "Windows 2001 SP4",
        "Windows 2001.1",
        "Windows 2001.1 SP1",   /* Added 03/2006 */
        "Windows 2006",         /* Added 03/2006 */

        /* Feature Group Strings */

        "Extended Address Space Descriptor"
            /*
             * All "optional" feature group strings (features that are implemented
             * by the host) should be implemented in the host version of
             * acpi_os_validate_interface and should not be added here.
             */
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_osi_implementation
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Implementation of the _OSI predefined control method
 *
 ******************************************************************************/

acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
{
        acpi_status status;
        union acpi_operand_object *string_desc;
        union acpi_operand_object *return_desc;
        acpi_native_uint i;

        ACPI_FUNCTION_TRACE(ut_osi_implementation);

        /* Validate the string input argument */

        string_desc = walk_state->arguments[0].object;
        if (!string_desc || (string_desc->common.type != ACPI_TYPE_STRING)) {
                return_ACPI_STATUS(AE_TYPE);
        }

        /* Create a return object */

        return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
        if (!return_desc) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        /* Default return value is SUPPORTED */

        return_desc->integer.value = ACPI_UINT32_MAX;
        walk_state->return_desc = return_desc;

        /* Compare input string to static table of supported interfaces */

        for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
                if (!ACPI_STRCMP
                    (string_desc->string.pointer,
                     acpi_interfaces_supported[i])) {

                        /* The interface is supported */

                        return_ACPI_STATUS(AE_CTRL_TERMINATE);
                }
        }

        /*
         * Did not match the string in the static table, call the host OSL to
         * check for a match with one of the optional strings (such as
         * "Module Device", "3.0 Thermal Model", etc.)
         */
        status = acpi_os_validate_interface(string_desc->string.pointer);
        if (ACPI_SUCCESS(status)) {

                /* The interface is supported */

                return_ACPI_STATUS(AE_CTRL_TERMINATE);
        }

        /* The interface is not supported */

        return_desc->integer.value = 0;
        return_ACPI_STATUS(AE_CTRL_TERMINATE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_evaluate_object
 *
 * PARAMETERS:  prefix_node         - Starting node
 *              Path                - Path to object from starting node
 *              expected_return_types - Bitmap of allowed return types
 *              return_desc         - Where a return value is stored
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluates a namespace object and verifies the type of the
 *              return object.  Common code that simplifies accessing objects
 *              that have required return objects of fixed types.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
                        char *path,
                        u32 expected_return_btypes,
                        union acpi_operand_object **return_desc)
{
        struct acpi_evaluate_info *info;
        acpi_status status;
        u32 return_btype;

        ACPI_FUNCTION_TRACE(ut_evaluate_object);

        /* Allocate the evaluation information block */

        info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
        if (!info) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        info->prefix_node = prefix_node;
        info->pathname = path;
        info->parameter_type = ACPI_PARAM_ARGS;

        /* Evaluate the object/method */

        status = acpi_ns_evaluate(info);
        if (ACPI_FAILURE(status)) {
                if (status == AE_NOT_FOUND) {
                        ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                          "[%4.4s.%s] was not found\n",
                                          acpi_ut_get_node_name(prefix_node),
                                          path));
                } else {
                        ACPI_ERROR_METHOD("Method execution failed",
                                          prefix_node, path, status);
                }

                goto cleanup;
        }

        /* Did we get a return object? */

        if (!info->return_object) {
                if (expected_return_btypes) {
                        ACPI_ERROR_METHOD("No object was returned from",
                                          prefix_node, path, AE_NOT_EXIST);

                        status = AE_NOT_EXIST;
                }

                goto cleanup;
        }

        /* Map the return object type to the bitmapped type */

        switch (ACPI_GET_OBJECT_TYPE(info->return_object)) {
        case ACPI_TYPE_INTEGER:
                return_btype = ACPI_BTYPE_INTEGER;
                break;

        case ACPI_TYPE_BUFFER:
                return_btype = ACPI_BTYPE_BUFFER;
                break;

        case ACPI_TYPE_STRING:
                return_btype = ACPI_BTYPE_STRING;
                break;

        case ACPI_TYPE_PACKAGE:
                return_btype = ACPI_BTYPE_PACKAGE;
                break;

        default:
                return_btype = 0;
                break;
        }

        if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
                /*
                 * We received a return object, but one was not expected.  This can
                 * happen frequently if the "implicit return" feature is enabled.
                 * Just delete the return object and return AE_OK.
                 */
                acpi_ut_remove_reference(info->return_object);
                goto cleanup;
        }

        /* Is the return object one of the expected types? */

        if (!(expected_return_btypes & return_btype)) {
                ACPI_ERROR_METHOD("Return object type is incorrect",
                                  prefix_node, path, AE_TYPE);

                ACPI_ERROR((AE_INFO,
                            "Type returned from %s was incorrect: %s, expected Btypes: %X",
                            path,
                            acpi_ut_get_object_type_name(info->return_object),
                            expected_return_btypes));

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

                acpi_ut_remove_reference(info->return_object);
                status = AE_TYPE;
                goto cleanup;
        }

        /* Object type is OK, return it */

        *return_desc = info->return_object;

      cleanup:
        ACPI_FREE(info);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_evaluate_numeric_object
 *
 * PARAMETERS:  object_name         - Object name to be evaluated
 *              device_node         - Node for the device
 *              Address             - Where the value is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 *              and stores result in *Address.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_evaluate_numeric_object(char *object_name,
                                struct acpi_namespace_node *device_node,
                                acpi_integer * address)
{
        union acpi_operand_object *obj_desc;
        acpi_status status;

        ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);

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

        /* Get the returned Integer */

        *address = 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_copy_id_string
 *
 * PARAMETERS:  Destination         - Where to copy the string
 *              Source              - Source string
 *              max_length          - Length of the destination buffer
 *
 * RETURN:      None
 *
 * DESCRIPTION: Copies an ID string for the _HID, _CID, and _UID methods.
 *              Performs removal of a leading asterisk if present -- workaround
 *              for a known issue on a bunch of machines.
 *
 ******************************************************************************/

static void
acpi_ut_copy_id_string(char *destination, char *source, acpi_size max_length)
{

        /*
         * Workaround for ID strings that have a leading asterisk. This construct
         * is not allowed by the ACPI specification  (ID strings must be
         * alphanumeric), but enough existing machines have this embedded in their
         * ID strings that the following code is useful.
         */
        if (*source == '*') {
                source++;
        }

        /* Do the actual copy */

        ACPI_STRNCPY(destination, source, max_length);
}

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

acpi_status
acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
                    struct acpi_device_id *hid)
{
        union acpi_operand_object *obj_desc;
        acpi_status status;

        ACPI_FUNCTION_TRACE(ut_execute_HID);

        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
 *              return_cid_list     - Where the CID list 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_ALLOCATE_ZEROED((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:
         *  1) Integer (32 bit compressed EISA ID) or
         *  2) 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_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 = ACPI_UINT32_MAX;
                        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,
                                                 ACPI_CAST_PTR(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",
                                                  ACPI_CAST_PTR(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);
}