drivers/acpi/acpica/utids.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utids - support for device Ids - HID, UID, CID, SUB, CLS
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 acpi_pnp_device_id **return_id)
  71 {
  72         union acpi_operand_object *obj_desc;
  73         struct acpi_pnp_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 acpi_pnp_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 PNP_DEVICE_ID struct */
 105
 106         hid->string =
 107             ACPI_ADD_PTR(char, hid, sizeof(struct acpi_pnp_device_id));
 108
 109         /* Convert EISAID to a string or simply copy existing string */
 110
 111         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 112                 acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value);
 113         } else {
 114                 strcpy(hid->string, obj_desc->string.pointer);
 115         }
 116
 117         hid->length = length;
 118         *return_id = hid;
 119
 120 cleanup:
 121
 122         /* On exit, we must delete the return object */
 123
 124         acpi_ut_remove_reference(obj_desc);
 125         return_ACPI_STATUS(status);
 126 }
 127
 128 /*******************************************************************************
 129  *
 130  * FUNCTION:    acpi_ut_execute_UID
 131  *
 132  * PARAMETERS:  device_node         - Node for the device
 133  *              return_id           - Where the string UID is returned
 134  *
 135  * RETURN:      Status
 136  *
 137  * DESCRIPTION: Executes the _UID control method that returns the unique
 138  *              ID of the device. The UID is either a 64-bit Integer (NOT an
 139  *              EISAID) or a string. Always returns a string. A 64-bit integer
 140  *              is converted to a decimal string.
 141  *
 142  *              NOTE: Internal function, no parameter validation
 143  *
 144  ******************************************************************************/
 145
 146 acpi_status
 147 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 148                     struct acpi_pnp_device_id **return_id)
 149 {
 150         union acpi_operand_object *obj_desc;
 151         struct acpi_pnp_device_id *uid;
 152         u32 length;
 153         acpi_status status;
 154
 155         ACPI_FUNCTION_TRACE(ut_execute_UID);
 156
 157         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 158                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 159                                          &obj_desc);
 160         if (ACPI_FAILURE(status)) {
 161                 return_ACPI_STATUS(status);
 162         }
 163
 164         /* Get the size of the String to be returned, includes null terminator */
 165
 166         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 167                 length = ACPI_MAX64_DECIMAL_DIGITS + 1;
 168         } else {
 169                 length = obj_desc->string.length + 1;
 170         }
 171
 172         /* Allocate a buffer for the UID */
 173
 174         uid =
 175             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
 176                                  (acpi_size)length);
 177         if (!uid) {
 178                 status = AE_NO_MEMORY;
 179                 goto cleanup;
 180         }
 181
 182         /* Area for the string starts after PNP_DEVICE_ID struct */
 183
 184         uid->string =
 185             ACPI_ADD_PTR(char, uid, sizeof(struct acpi_pnp_device_id));
 186
 187         /* Convert an Integer to string, or just copy an existing string */
 188
 189         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 190                 acpi_ex_integer_to_string(uid->string, obj_desc->integer.value);
 191         } else {
 192                 strcpy(uid->string, obj_desc->string.pointer);
 193         }
 194
 195         uid->length = length;
 196         *return_id = uid;
 197
 198 cleanup:
 199
 200         /* On exit, we must delete the return object */
 201
 202         acpi_ut_remove_reference(obj_desc);
 203         return_ACPI_STATUS(status);
 204 }
 205
 206 /*******************************************************************************
 207  *
 208  * FUNCTION:    acpi_ut_execute_CID
 209  *
 210  * PARAMETERS:  device_node         - Node for the device
 211  *              return_cid_list     - Where the CID list is returned
 212  *
 213  * RETURN:      Status, list of CID strings
 214  *
 215  * DESCRIPTION: Executes the _CID control method that returns one or more
 216  *              compatible hardware IDs for the device.
 217  *
 218  *              NOTE: Internal function, no parameter validation
 219  *
 220  * A _CID method can return either a single compatible ID or a package of
 221  * compatible IDs. Each compatible ID can be one of the following:
 222  * 1) Integer (32 bit compressed EISA ID) or
 223  * 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 224  *
 225  * The Integer CIDs are converted to string format by this function.
 226  *
 227  ******************************************************************************/
 228
 229 acpi_status
 230 acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
 231                     struct acpi_pnp_device_id_list **return_cid_list)
 232 {
 233         union acpi_operand_object **cid_objects;
 234         union acpi_operand_object *obj_desc;
 235         struct acpi_pnp_device_id_list *cid_list;
 236         char *next_id_string;
 237         u32 string_area_size;
 238         u32 length;
 239         u32 cid_list_size;
 240         acpi_status status;
 241         u32 count;
 242         u32 i;
 243
 244         ACPI_FUNCTION_TRACE(ut_execute_CID);
 245
 246         /* Evaluate the _CID method for this device */
 247
 248         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 249                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 250                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 251         if (ACPI_FAILURE(status)) {
 252                 return_ACPI_STATUS(status);
 253         }
 254
 255         /*
 256          * Get the count and size of the returned _CIDs. _CID can return either
 257          * a Package of Integers/Strings or a single Integer or String.
 258          * Note: This section also validates that all CID elements are of the
 259          * correct type (Integer or String).
 260          */
 261         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 262                 count = obj_desc->package.count;
 263                 cid_objects = obj_desc->package.elements;
 264         } else {                /* Single Integer or String CID */
 265
 266                 count = 1;
 267                 cid_objects = &obj_desc;
 268         }
 269
 270         string_area_size = 0;
 271         for (i = 0; i < count; i++) {
 272
 273                 /* String lengths include null terminator */
 274
 275                 switch (cid_objects[i]->common.type) {
 276                 case ACPI_TYPE_INTEGER:
 277
 278                         string_area_size += ACPI_EISAID_STRING_SIZE;
 279                         break;
 280
 281                 case ACPI_TYPE_STRING:
 282
 283                         string_area_size += cid_objects[i]->string.length + 1;
 284                         break;
 285
 286                 default:
 287
 288                         status = AE_TYPE;
 289                         goto cleanup;
 290                 }
 291         }
 292
 293         /*
 294          * Now that we know the length of the CIDs, allocate return buffer:
 295          * 1) Size of the base structure +
 296          * 2) Size of the CID PNP_DEVICE_ID array +
 297          * 3) Size of the actual CID strings
 298          */
 299         cid_list_size = sizeof(struct acpi_pnp_device_id_list) +
 300             ((count - 1) * sizeof(struct acpi_pnp_device_id)) +
 301             string_area_size;
 302
 303         cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size);
 304         if (!cid_list) {
 305                 status = AE_NO_MEMORY;
 306                 goto cleanup;
 307         }
 308
 309         /* Area for CID strings starts after the CID PNP_DEVICE_ID array */
 310
 311         next_id_string = ACPI_CAST_PTR(char, cid_list->ids) +
 312             ((acpi_size)count * sizeof(struct acpi_pnp_device_id));
 313
 314         /* Copy/convert the CIDs to the return buffer */
 315
 316         for (i = 0; i < count; i++) {
 317                 if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) {
 318
 319                         /* Convert the Integer (EISAID) CID to a string */
 320
 321                         acpi_ex_eisa_id_to_string(next_id_string,
 322                                                   cid_objects[i]->integer.
 323                                                   value);
 324                         length = ACPI_EISAID_STRING_SIZE;
 325                 } else {        /* ACPI_TYPE_STRING */
 326
 327                         /* Copy the String CID from the returned object */
 328
 329                         strcpy(next_id_string, cid_objects[i]->string.pointer);
 330                         length = cid_objects[i]->string.length + 1;
 331                 }
 332
 333                 cid_list->ids[i].string = next_id_string;
 334                 cid_list->ids[i].length = length;
 335                 next_id_string += length;
 336         }
 337
 338         /* Finish the CID list */
 339
 340         cid_list->count = count;
 341         cid_list->list_size = cid_list_size;
 342         *return_cid_list = cid_list;
 343
 344 cleanup:
 345
 346         /* On exit, we must delete the _CID return object */
 347
 348         acpi_ut_remove_reference(obj_desc);
 349         return_ACPI_STATUS(status);
 350 }
 351
 352 /*******************************************************************************
 353  *
 354  * FUNCTION:    acpi_ut_execute_CLS
 355  *
 356  * PARAMETERS:  device_node         - Node for the device
 357  *              return_id           - Where the _CLS is returned
 358  *
 359  * RETURN:      Status
 360  *
 361  * DESCRIPTION: Executes the _CLS control method that returns PCI-defined
 362  *              class code of the device. The _CLS value is always a package
 363  *              containing PCI class information as a list of integers.
 364  *              The returned string has format "BBSSPP", where:
 365  *                BB = Base-class code
 366  *                SS = Sub-class code
 367  *                PP = Programming Interface code
 368  *
 369  ******************************************************************************/
 370
 371 acpi_status
 372 acpi_ut_execute_CLS(struct acpi_namespace_node *device_node,
 373                     struct acpi_pnp_device_id **return_id)
 374 {
 375         union acpi_operand_object *obj_desc;
 376         union acpi_operand_object **cls_objects;
 377         u32 count;
 378         struct acpi_pnp_device_id *cls;
 379         u32 length;
 380         acpi_status status;
 381         u8 class_code[3] = { 0, 0, 0 };
 382
 383         ACPI_FUNCTION_TRACE(ut_execute_CLS);
 384
 385         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CLS,
 386                                          ACPI_BTYPE_PACKAGE, &obj_desc);
 387         if (ACPI_FAILURE(status)) {
 388                 return_ACPI_STATUS(status);
 389         }
 390
 391         /* Get the size of the String to be returned, includes null terminator */
 392
 393         length = ACPI_PCICLS_STRING_SIZE;
 394         cls_objects = obj_desc->package.elements;
 395         count = obj_desc->package.count;
 396
 397         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 398                 if (count > 0
 399                     && cls_objects[0]->common.type == ACPI_TYPE_INTEGER) {
 400                         class_code[0] = (u8)cls_objects[0]->integer.value;
 401                 }
 402                 if (count > 1
 403                     && cls_objects[1]->common.type == ACPI_TYPE_INTEGER) {
 404                         class_code[1] = (u8)cls_objects[1]->integer.value;
 405                 }
 406                 if (count > 2
 407                     && cls_objects[2]->common.type == ACPI_TYPE_INTEGER) {
 408                         class_code[2] = (u8)cls_objects[2]->integer.value;
 409                 }
 410         }
 411
 412         /* Allocate a buffer for the CLS */
 413
 414         cls =
 415             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
 416                                  (acpi_size)length);
 417         if (!cls) {
 418                 status = AE_NO_MEMORY;
 419                 goto cleanup;
 420         }
 421
 422         /* Area for the string starts after PNP_DEVICE_ID struct */
 423
 424         cls->string =
 425             ACPI_ADD_PTR(char, cls, sizeof(struct acpi_pnp_device_id));
 426
 427         /* Simply copy existing string */
 428
 429         acpi_ex_pci_cls_to_string(cls->string, class_code);
 430         cls->length = length;
 431         *return_id = cls;
 432
 433 cleanup:
 434
 435         /* On exit, we must delete the return object */
 436
 437         acpi_ut_remove_reference(obj_desc);
 438         return_ACPI_STATUS(status);
 439 }