drivers/acpi/acpica/utids.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: utids - support for device Ids - HID, UID, CID, SUB, CLS
   5  *
   6  * Copyright (C) 2000 - 2020, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #include <acpi/acpi.h>
  11 #include "accommon.h"
  12 #include "acinterp.h"
  13
  14 #define _COMPONENT          ACPI_UTILITIES
  15 ACPI_MODULE_NAME("utids")
  16
  17 /*******************************************************************************
  18  *
  19  * FUNCTION:    acpi_ut_execute_HID
  20  *
  21  * PARAMETERS:  device_node         - Node for the device
  22  *              return_id           - Where the string HID is returned
  23  *
  24  * RETURN:      Status
  25  *
  26  * DESCRIPTION: Executes the _HID control method that returns the hardware
  27  *              ID of the device. The HID is either an 32-bit encoded EISAID
  28  *              Integer or a String. A string is always returned. An EISAID
  29  *              is converted to a string.
  30  *
  31  *              NOTE: Internal function, no parameter validation
  32  *
  33  ******************************************************************************/
  34 acpi_status
  35 acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
  36                     struct acpi_pnp_device_id **return_id)
  37 {
  38         union acpi_operand_object *obj_desc;
  39         struct acpi_pnp_device_id *hid;
  40         u32 length;
  41         acpi_status status;
  42
  43         ACPI_FUNCTION_TRACE(ut_execute_HID);
  44
  45         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__HID,
  46                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
  47                                          &obj_desc);
  48         if (ACPI_FAILURE(status)) {
  49                 return_ACPI_STATUS(status);
  50         }
  51
  52         /* Get the size of the String to be returned, includes null terminator */
  53
  54         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
  55                 length = ACPI_EISAID_STRING_SIZE;
  56         } else {
  57                 length = obj_desc->string.length + 1;
  58         }
  59
  60         /* Allocate a buffer for the HID */
  61
  62         hid =
  63             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
  64                                  (acpi_size)length);
  65         if (!hid) {
  66                 status = AE_NO_MEMORY;
  67                 goto cleanup;
  68         }
  69
  70         /* Area for the string starts after PNP_DEVICE_ID struct */
  71
  72         hid->string =
  73             ACPI_ADD_PTR(char, hid, sizeof(struct acpi_pnp_device_id));
  74
  75         /* Convert EISAID to a string or simply copy existing string */
  76
  77         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
  78                 acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value);
  79         } else {
  80                 strcpy(hid->string, obj_desc->string.pointer);
  81         }
  82
  83         hid->length = length;
  84         *return_id = hid;
  85
  86 cleanup:
  87
  88         /* On exit, we must delete the return object */
  89
  90         acpi_ut_remove_reference(obj_desc);
  91         return_ACPI_STATUS(status);
  92 }
  93
  94 /*******************************************************************************
  95  *
  96  * FUNCTION:    acpi_ut_execute_UID
  97  *
  98  * PARAMETERS:  device_node         - Node for the device
  99  *              return_id           - Where the string UID is returned
 100  *
 101  * RETURN:      Status
 102  *
 103  * DESCRIPTION: Executes the _UID control method that returns the unique
 104  *              ID of the device. The UID is either a 64-bit Integer (NOT an
 105  *              EISAID) or a string. Always returns a string. A 64-bit integer
 106  *              is converted to a decimal string.
 107  *
 108  *              NOTE: Internal function, no parameter validation
 109  *
 110  ******************************************************************************/
 111
 112 acpi_status
 113 acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
 114                     struct acpi_pnp_device_id **return_id)
 115 {
 116         union acpi_operand_object *obj_desc;
 117         struct acpi_pnp_device_id *uid;
 118         u32 length;
 119         acpi_status status;
 120
 121         ACPI_FUNCTION_TRACE(ut_execute_UID);
 122
 123         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__UID,
 124                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING,
 125                                          &obj_desc);
 126         if (ACPI_FAILURE(status)) {
 127                 return_ACPI_STATUS(status);
 128         }
 129
 130         /* Get the size of the String to be returned, includes null terminator */
 131
 132         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 133                 length = ACPI_MAX64_DECIMAL_DIGITS + 1;
 134         } else {
 135                 length = obj_desc->string.length + 1;
 136         }
 137
 138         /* Allocate a buffer for the UID */
 139
 140         uid =
 141             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
 142                                  (acpi_size)length);
 143         if (!uid) {
 144                 status = AE_NO_MEMORY;
 145                 goto cleanup;
 146         }
 147
 148         /* Area for the string starts after PNP_DEVICE_ID struct */
 149
 150         uid->string =
 151             ACPI_ADD_PTR(char, uid, sizeof(struct acpi_pnp_device_id));
 152
 153         /* Convert an Integer to string, or just copy an existing string */
 154
 155         if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
 156                 acpi_ex_integer_to_string(uid->string, obj_desc->integer.value);
 157         } else {
 158                 strcpy(uid->string, obj_desc->string.pointer);
 159         }
 160
 161         uid->length = length;
 162         *return_id = uid;
 163
 164 cleanup:
 165
 166         /* On exit, we must delete the return object */
 167
 168         acpi_ut_remove_reference(obj_desc);
 169         return_ACPI_STATUS(status);
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_ut_execute_CID
 175  *
 176  * PARAMETERS:  device_node         - Node for the device
 177  *              return_cid_list     - Where the CID list is returned
 178  *
 179  * RETURN:      Status, list of CID strings
 180  *
 181  * DESCRIPTION: Executes the _CID control method that returns one or more
 182  *              compatible hardware IDs for the device.
 183  *
 184  *              NOTE: Internal function, no parameter validation
 185  *
 186  * A _CID method can return either a single compatible ID or a package of
 187  * compatible IDs. Each compatible ID can be one of the following:
 188  * 1) Integer (32 bit compressed EISA ID) or
 189  * 2) String (PCI ID format, e.g. "PCI\VEN_vvvv&DEV_dddd&SUBSYS_ssssssss")
 190  *
 191  * The Integer CIDs are converted to string format by this function.
 192  *
 193  ******************************************************************************/
 194
 195 acpi_status
 196 acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
 197                     struct acpi_pnp_device_id_list **return_cid_list)
 198 {
 199         union acpi_operand_object **cid_objects;
 200         union acpi_operand_object *obj_desc;
 201         struct acpi_pnp_device_id_list *cid_list;
 202         char *next_id_string;
 203         u32 string_area_size;
 204         u32 length;
 205         u32 cid_list_size;
 206         acpi_status status;
 207         u32 count;
 208         u32 i;
 209
 210         ACPI_FUNCTION_TRACE(ut_execute_CID);
 211
 212         /* Evaluate the _CID method for this device */
 213
 214         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CID,
 215                                          ACPI_BTYPE_INTEGER | ACPI_BTYPE_STRING
 216                                          | ACPI_BTYPE_PACKAGE, &obj_desc);
 217         if (ACPI_FAILURE(status)) {
 218                 return_ACPI_STATUS(status);
 219         }
 220
 221         /*
 222          * Get the count and size of the returned _CIDs. _CID can return either
 223          * a Package of Integers/Strings or a single Integer or String.
 224          * Note: This section also validates that all CID elements are of the
 225          * correct type (Integer or String).
 226          */
 227         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 228                 count = obj_desc->package.count;
 229                 cid_objects = obj_desc->package.elements;
 230         } else {                /* Single Integer or String CID */
 231
 232                 count = 1;
 233                 cid_objects = &obj_desc;
 234         }
 235
 236         string_area_size = 0;
 237         for (i = 0; i < count; i++) {
 238
 239                 /* String lengths include null terminator */
 240
 241                 switch (cid_objects[i]->common.type) {
 242                 case ACPI_TYPE_INTEGER:
 243
 244                         string_area_size += ACPI_EISAID_STRING_SIZE;
 245                         break;
 246
 247                 case ACPI_TYPE_STRING:
 248
 249                         string_area_size += cid_objects[i]->string.length + 1;
 250                         break;
 251
 252                 default:
 253
 254                         status = AE_TYPE;
 255                         goto cleanup;
 256                 }
 257         }
 258
 259         /*
 260          * Now that we know the length of the CIDs, allocate return buffer:
 261          * 1) Size of the base structure +
 262          * 2) Size of the CID PNP_DEVICE_ID array +
 263          * 3) Size of the actual CID strings
 264          */
 265         cid_list_size = sizeof(struct acpi_pnp_device_id_list) +
 266             (count * sizeof(struct acpi_pnp_device_id)) + string_area_size;
 267
 268         cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size);
 269         if (!cid_list) {
 270                 status = AE_NO_MEMORY;
 271                 goto cleanup;
 272         }
 273
 274         /* Area for CID strings starts after the CID PNP_DEVICE_ID array */
 275
 276         next_id_string = ACPI_CAST_PTR(char, cid_list->ids) +
 277             ((acpi_size)count * sizeof(struct acpi_pnp_device_id));
 278
 279         /* Copy/convert the CIDs to the return buffer */
 280
 281         for (i = 0; i < count; i++) {
 282                 if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) {
 283
 284                         /* Convert the Integer (EISAID) CID to a string */
 285
 286                         acpi_ex_eisa_id_to_string(next_id_string,
 287                                                   cid_objects[i]->integer.
 288                                                   value);
 289                         length = ACPI_EISAID_STRING_SIZE;
 290                 } else {        /* ACPI_TYPE_STRING */
 291                         /* Copy the String CID from the returned object */
 292                         strcpy(next_id_string, cid_objects[i]->string.pointer);
 293                         length = cid_objects[i]->string.length + 1;
 294                 }
 295
 296                 cid_list->ids[i].string = next_id_string;
 297                 cid_list->ids[i].length = length;
 298                 next_id_string += length;
 299         }
 300
 301         /* Finish the CID list */
 302
 303         cid_list->count = count;
 304         cid_list->list_size = cid_list_size;
 305         *return_cid_list = cid_list;
 306
 307 cleanup:
 308
 309         /* On exit, we must delete the _CID return object */
 310
 311         acpi_ut_remove_reference(obj_desc);
 312         return_ACPI_STATUS(status);
 313 }
 314
 315 /*******************************************************************************
 316  *
 317  * FUNCTION:    acpi_ut_execute_CLS
 318  *
 319  * PARAMETERS:  device_node         - Node for the device
 320  *              return_id           - Where the _CLS is returned
 321  *
 322  * RETURN:      Status
 323  *
 324  * DESCRIPTION: Executes the _CLS control method that returns PCI-defined
 325  *              class code of the device. The _CLS value is always a package
 326  *              containing PCI class information as a list of integers.
 327  *              The returned string has format "BBSSPP", where:
 328  *                BB = Base-class code
 329  *                SS = Sub-class code
 330  *                PP = Programming Interface code
 331  *
 332  ******************************************************************************/
 333
 334 acpi_status
 335 acpi_ut_execute_CLS(struct acpi_namespace_node *device_node,
 336                     struct acpi_pnp_device_id **return_id)
 337 {
 338         union acpi_operand_object *obj_desc;
 339         union acpi_operand_object **cls_objects;
 340         u32 count;
 341         struct acpi_pnp_device_id *cls;
 342         u32 length;
 343         acpi_status status;
 344         u8 class_code[3] = { 0, 0, 0 };
 345
 346         ACPI_FUNCTION_TRACE(ut_execute_CLS);
 347
 348         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CLS,
 349                                          ACPI_BTYPE_PACKAGE, &obj_desc);
 350         if (ACPI_FAILURE(status)) {
 351                 return_ACPI_STATUS(status);
 352         }
 353
 354         /* Get the size of the String to be returned, includes null terminator */
 355
 356         length = ACPI_PCICLS_STRING_SIZE;
 357         cls_objects = obj_desc->package.elements;
 358         count = obj_desc->package.count;
 359
 360         if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
 361                 if (count > 0
 362                     && cls_objects[0]->common.type == ACPI_TYPE_INTEGER) {
 363                         class_code[0] = (u8)cls_objects[0]->integer.value;
 364                 }
 365                 if (count > 1
 366                     && cls_objects[1]->common.type == ACPI_TYPE_INTEGER) {
 367                         class_code[1] = (u8)cls_objects[1]->integer.value;
 368                 }
 369                 if (count > 2
 370                     && cls_objects[2]->common.type == ACPI_TYPE_INTEGER) {
 371                         class_code[2] = (u8)cls_objects[2]->integer.value;
 372                 }
 373         }
 374
 375         /* Allocate a buffer for the CLS */
 376
 377         cls =
 378             ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
 379                                  (acpi_size)length);
 380         if (!cls) {
 381                 status = AE_NO_MEMORY;
 382                 goto cleanup;
 383         }
 384
 385         /* Area for the string starts after PNP_DEVICE_ID struct */
 386
 387         cls->string =
 388             ACPI_ADD_PTR(char, cls, sizeof(struct acpi_pnp_device_id));
 389
 390         /* Simply copy existing string */
 391
 392         acpi_ex_pci_cls_to_string(cls->string, class_code);
 393         cls->length = length;
 394         *return_id = cls;
 395
 396 cleanup:
 397
 398         /* On exit, we must delete the return object */
 399
 400         acpi_ut_remove_reference(obj_desc);
 401         return_ACPI_STATUS(status);
 402 }