drivers/acpi/acpica/utids.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utids - support for device IDs - HID, UID, CID
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acinterp.h"
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("utids")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ut_execute_HID
  54  *
  55  * PARAMETERS:  device_node         - Node for the device
  56  *              return_id           - Where the string HID is returned
  57  *
  58  * RETURN:      Status
  59  *
  60  * DESCRIPTION: Executes the _HID control method that returns the hardware
  61  *              ID of the device. The HID is either an 32-bit encoded EISAID
  62  *              Integer or a String. A string is always returned. An EISAID
  63  *              is converted to a string.
  64  *
  65  *              NOTE: Internal function, no parameter validation
  66  *
  67  ******************************************************************************/
  68 acpi_status
  69 acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
  70                     struct acpica_device_id **return_id)
  71 {
  72         union acpi_operand_object *obj_desc;
  73         struct acpica_device_id *hid;
  74         u32 length;
  75         acpi_status status;
  76
  77         ACPI_FUNCTION_TRACE(ut_execute_HID);
  78
  79         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
  80                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
  81                                          &obj_desc);
  82         if (ACPI_FAILURE(status)) {
  83                 return_ACPI_STATUS(status);
  84         }
  85
  86         /* Get the size of the String to be returned, includes null terminator */
  87
  88         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
  89                 length = ACPI_EISAID_STRING_SIZE;
  90         } else {
  91                 length = obj_desc->string.length + 1;
  92         }
  93
  94         /* Allocate a buffer for the HID */
  95
  96         hid =
  97             ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) +
  98                                  (acpi_size) length);
  99         if (!hid) {
 100                 status = AE_NO_MEMORY;
 101                 goto cleanup;
 102         }
 103
 104         /* Area for the string starts after DEVICE_ID struct */
 105
 106         hid->string = ACPI_ADD_PTR(char, hid, sizeof(struct acpica_device_id));
 107
 108         /* Convert EISAID to a string or simply copy existing string */
 109
 110         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 111                 acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value);
 112         } else {
 113                 ACPI_STRCPY(hid->string, obj_desc->string.pointer);
 114         }
 115
 116         hid->length = length;
 117         *return_id = hid;
 118
 119 cleanup:
 120
 121         /* On exit, we must delete the return object */
 122
 123         acpi_ut_remove_reference(obj_desc);
 124         return_ACPI_STATUS(status);
 125 }
 126
 127 /*******************************************************************************
 128  *
 129  * FUNCTION:    acpi_ut_execute_UID
 130  *
 131  * PARAMETERS:  device_node         - Node for the device
 132  *              return_id           - Where the string UID is returned
 133  *
 134  * RETURN:      Status
 135  *
 136  * DESCRIPTION: Executes the _UID control method that returns the unique
 137  *              ID of the device. The UID is either a 64-bit Integer (NOT an
 138  *              EISAID) or a string. Always returns a string. A 64-bit integer
 139  *              is converted to a decimal string.
 140  *
 141  *              NOTE: Internal function, no parameter validation
 142  *
 143  ******************************************************************************/
 144
 145 acpi_status
 146 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 147                     struct acpica_device_id **return_id)
 148 {
 149         union acpi_operand_object *obj_desc;
 150         struct acpica_device_id *uid;
 151         u32 length;
 152         acpi_status status;
 153
 154         ACPI_FUNCTION_TRACE(ut_execute_UID);
 155
 156         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 157                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 158                                          &obj_desc);
 159         if (ACPI_FAILURE(status)) {
 160                 return_ACPI_STATUS(status);
 161         }
 162
 163         /* Get the size of the String to be returned, includes null terminator */
 164
 165         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 166                 length = ACPI_MAX64_DECIMAL_DIGITS + 1;
 167         } else {
 168                 length = obj_desc->string.length + 1;
 169         }
 170
 171         /* Allocate a buffer for the UID */
 172
 173         uid =
 174             ACPI_ALLOCATE_ZEROED(sizeof(struct acpica_device_id) +
 175                                  (acpi_size) length);
 176         if (!uid) {
 177                 status = AE_NO_MEMORY;
 178                 goto cleanup;
 179         }
 180
 181         /* Area for the string starts after DEVICE_ID struct */
 182
 183         uid->string = ACPI_ADD_PTR(char, uid, sizeof(struct acpica_device_id));
 184
 185         /* Convert an Integer to string, or just copy an existing string */
 186
 187         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 188                 acpi_ex_integer_to_string(uid->string, obj_desc->integer.value);
 189         } else {
 190                 ACPI_STRCPY(uid->string, obj_desc->string.pointer);
 191         }
 192
 193         uid->length = length;
 194         *return_id = uid;
 195
 196 cleanup:
 197
 198         /* On exit, we must delete the return object */
 199
 200         acpi_ut_remove_reference(obj_desc);
 201         return_ACPI_STATUS(status);
 202 }
 203
 204 /*******************************************************************************
 205  *
 206  * FUNCTION:    acpi_ut_execute_CID
 207  *
 208  * PARAMETERS:  device_node         - Node for the device
 209  *              return_cid_list     - Where the CID list is returned
 210  *
 211  * RETURN:      Status, list of CID strings
 212  *
 213  * DESCRIPTION: Executes the _CID control method that returns one or more
 214  *              compatible hardware IDs for the device.
 215  *
 216  *              NOTE: Internal function, no parameter validation
 217  *
 218  * A _CID method can return either a single compatible ID or a package of
 219  * compatible IDs. Each compatible ID can be one of the following:
 220  * 1) Integer (32 bit compressed EISA ID) or
 221  * 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 222  *
 223  * The Integer CIDs are converted to string format by this function.
 224  *
 225  ******************************************************************************/
 226
 227 acpi_status
 228 acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
 229                     struct acpica_device_id_list **return_cid_list)
 230 {
 231         union acpi_operand_object **cid_objects;
 232         union acpi_operand_object *obj_desc;
 233         struct acpica_device_id_list *cid_list;
 234         char *next_id_string;
 235         u32 string_area_size;
 236         u32 length;
 237         u32 cid_list_size;
 238         acpi_status status;
 239         u32 count;
 240         u32 i;
 241
 242         ACPI_FUNCTION_TRACE(ut_execute_CID);
 243
 244         /* Evaluate the _CID method for this device */
 245
 246         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 247                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 248                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 249         if (ACPI_FAILURE(status)) {
 250                 return_ACPI_STATUS(status);
 251         }
 252
 253         /*
 254          * Get the count and size of the returned _CIDs. _CID can return either
 255          * a Package of Integers/Strings or a single Integer or String.
 256          * Note: This section also validates that all CID elements are of the
 257          * correct type (Integer or String).
 258          */
 259         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 260                 count = obj_desc->package.count;
 261                 cid_objects = obj_desc->package.elements;
 262         } else {                /* Single Integer or String CID */
 263
 264                 count = 1;
 265                 cid_objects = &obj_desc;
 266         }
 267
 268         string_area_size = 0;
 269         for (i = 0; i < count; i++) {
 270
 271                 /* String lengths include null terminator */
 272
 273                 switch (cid_objects[i]->common.type) {
 274                 case ACPI_TYPE_INTEGER:
 275                         string_area_size += ACPI_EISAID_STRING_SIZE;
 276                         break;
 277
 278                 case ACPI_TYPE_STRING:
 279                         string_area_size += cid_objects[i]->string.length + 1;
 280                         break;
 281
 282                 default:
 283                         status = AE_TYPE;
 284                         goto cleanup;
 285                 }
 286         }
 287
 288         /*
 289          * Now that we know the length of the CIDs, allocate return buffer:
 290          * 1) Size of the base structure +
 291          * 2) Size of the CID DEVICE_ID array +
 292          * 3) Size of the actual CID strings
 293          */
 294         cid_list_size = sizeof(struct acpica_device_id_list) +
 295             ((count - 1) * sizeof(struct acpica_device_id)) + string_area_size;
 296
 297         cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size);
 298         if (!cid_list) {
 299                 status = AE_NO_MEMORY;
 300                 goto cleanup;
 301         }
 302
 303         /* Area for CID strings starts after the CID DEVICE_ID array */
 304
 305         next_id_string = ACPI_CAST_PTR(char, cid_list->ids) +
 306             ((acpi_size) count * sizeof(struct acpica_device_id));
 307
 308         /* Copy/convert the CIDs to the return buffer */
 309
 310         for (i = 0; i < count; i++) {
 311                 if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) {
 312
 313                         /* Convert the Integer (EISAID) CID to a string */
 314
 315                         acpi_ex_eisa_id_to_string(next_id_string,
 316                                                   cid_objects[i]->integer.
 317                                                   value);
 318                         length = ACPI_EISAID_STRING_SIZE;
 319                 } else {        /* ACPI_TYPE_STRING */
 320
 321                         /* Copy the String CID from the returned object */
 322
 323                         ACPI_STRCPY(next_id_string,
 324                                     cid_objects[i]->string.pointer);
 325                         length = cid_objects[i]->string.length + 1;
 326                 }
 327
 328                 cid_list->ids[i].string = next_id_string;
 329                 cid_list->ids[i].length = length;
 330                 next_id_string += length;
 331         }
 332
 333         /* Finish the CID list */
 334
 335         cid_list->count = count;
 336         cid_list->list_size = cid_list_size;
 337         *return_cid_list = cid_list;
 338
 339 cleanup:
 340
 341         /* On exit, we must delete the _CID return object */
 342
 343         acpi_ut_remove_reference(obj_desc);
 344         return_ACPI_STATUS(status);
 345 }