utids.c 12 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418
/******************************************************************************
 *
 * Module Name: utids - support for device Ids - HID, UID, CID
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2013, Intel Corp.
 * 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 "accommon.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utids")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_HID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_id           - Where the string HID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _HID control method that returns the hardware
 *              ID of the device. The HID is either an 32-bit encoded EISAID
 *              Integer or a String. A string is always returned. An EISAID
 *              is converted to a string.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/
acpi_status
acpi_ut_execute_HID(struct acpi_namespace_node *device_node,
		    struct acpi_pnp_device_id **return_id)
{
	union acpi_operand_object *obj_desc;
	struct acpi_pnp_device_id *hid;
	u32 length;
	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);
	}

	/* Get the size of the String to be returned, includes null terminator */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		length = ACPI_EISAID_STRING_SIZE;
	} else {
		length = obj_desc->string.length + 1;
	}

	/* Allocate a buffer for the HID */

	hid =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
				 (acpi_size) length);
	if (!hid) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for the string starts after PNP_DEVICE_ID struct */

	hid->string =
	    ACPI_ADD_PTR(char, hid, sizeof(struct acpi_pnp_device_id));

	/* Convert EISAID to a string or simply copy existing string */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		acpi_ex_eisa_id_to_string(hid->string, obj_desc->integer.value);
	} else {
		ACPI_STRCPY(hid->string, obj_desc->string.pointer);
	}

	hid->length = length;
	*return_id = hid;

cleanup:

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

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_SUB
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_id           - Where the _SUB is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _SUB control method that returns the subsystem
 *              ID of the device. The _SUB value is always a string containing
 *              either a valid PNP or ACPI ID.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_SUB(struct acpi_namespace_node *device_node,
		    struct acpi_pnp_device_id **return_id)
{
	union acpi_operand_object *obj_desc;
	struct acpi_pnp_device_id *sub;
	u32 length;
	acpi_status status;

	ACPI_FUNCTION_TRACE(ut_execute_SUB);

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

	/* Get the size of the String to be returned, includes null terminator */

	length = obj_desc->string.length + 1;

	/* Allocate a buffer for the SUB */

	sub =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
				 (acpi_size) length);
	if (!sub) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for the string starts after PNP_DEVICE_ID struct */

	sub->string =
	    ACPI_ADD_PTR(char, sub, sizeof(struct acpi_pnp_device_id));

	/* Simply copy existing string */

	ACPI_STRCPY(sub->string, obj_desc->string.pointer);
	sub->length = length;
	*return_id = sub;

cleanup:

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

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_UID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_id           - Where the string UID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Executes the _UID control method that returns the unique
 *              ID of the device. The UID is either a 64-bit Integer (NOT an
 *              EISAID) or a string. Always returns a string. A 64-bit integer
 *              is converted to a decimal string.
 *
 *              NOTE: Internal function, no parameter validation
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_UID(struct acpi_namespace_node *device_node,
		    struct acpi_pnp_device_id **return_id)
{
	union acpi_operand_object *obj_desc;
	struct acpi_pnp_device_id *uid;
	u32 length;
	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);
	}

	/* Get the size of the String to be returned, includes null terminator */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		length = ACPI_MAX64_DECIMAL_DIGITS + 1;
	} else {
		length = obj_desc->string.length + 1;
	}

	/* Allocate a buffer for the UID */

	uid =
	    ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
				 (acpi_size) length);
	if (!uid) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for the string starts after PNP_DEVICE_ID struct */

	uid->string =
	    ACPI_ADD_PTR(char, uid, sizeof(struct acpi_pnp_device_id));

	/* Convert an Integer to string, or just copy an existing string */

	if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
		acpi_ex_integer_to_string(uid->string, obj_desc->integer.value);
	} else {
		ACPI_STRCPY(uid->string, obj_desc->string.pointer);
	}

	uid->length = length;
	*return_id = uid;

cleanup:

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

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_execute_CID
 *
 * PARAMETERS:  device_node         - Node for the device
 *              return_cid_list     - Where the CID list is returned
 *
 * RETURN:      Status, list of CID strings
 *
 * DESCRIPTION: Executes the _CID control method that returns one or more
 *              compatible hardware IDs for the device.
 *
 *              NOTE: Internal function, no parameter validation
 *
 * A _CID method 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 Integer CIDs are converted to string format by this function.
 *
 ******************************************************************************/

acpi_status
acpi_ut_execute_CID(struct acpi_namespace_node *device_node,
		    struct acpi_pnp_device_id_list **return_cid_list)
{
	union acpi_operand_object **cid_objects;
	union acpi_operand_object *obj_desc;
	struct acpi_pnp_device_id_list *cid_list;
	char *next_id_string;
	u32 string_area_size;
	u32 length;
	u32 cid_list_size;
	acpi_status status;
	u32 count;
	u32 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 count and size of the returned _CIDs. _CID can return either
	 * a Package of Integers/Strings or a single Integer or String.
	 * Note: This section also validates that all CID elements are of the
	 * correct type (Integer or String).
	 */
	if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
		count = obj_desc->package.count;
		cid_objects = obj_desc->package.elements;
	} else {		/* Single Integer or String CID */

		count = 1;
		cid_objects = &obj_desc;
	}

	string_area_size = 0;
	for (i = 0; i < count; i++) {

		/* String lengths include null terminator */

		switch (cid_objects[i]->common.type) {
		case ACPI_TYPE_INTEGER:

			string_area_size += ACPI_EISAID_STRING_SIZE;
			break;

		case ACPI_TYPE_STRING:

			string_area_size += cid_objects[i]->string.length + 1;
			break;

		default:

			status = AE_TYPE;
			goto cleanup;
		}
	}

	/*
	 * Now that we know the length of the CIDs, allocate return buffer:
	 * 1) Size of the base structure +
	 * 2) Size of the CID PNP_DEVICE_ID array +
	 * 3) Size of the actual CID strings
	 */
	cid_list_size = sizeof(struct acpi_pnp_device_id_list) +
	    ((count - 1) * sizeof(struct acpi_pnp_device_id)) +
	    string_area_size;

	cid_list = ACPI_ALLOCATE_ZEROED(cid_list_size);
	if (!cid_list) {
		status = AE_NO_MEMORY;
		goto cleanup;
	}

	/* Area for CID strings starts after the CID PNP_DEVICE_ID array */

	next_id_string = ACPI_CAST_PTR(char, cid_list->ids) +
	    ((acpi_size) count * sizeof(struct acpi_pnp_device_id));

	/* Copy/convert the CIDs to the return buffer */

	for (i = 0; i < count; i++) {
		if (cid_objects[i]->common.type == ACPI_TYPE_INTEGER) {

			/* Convert the Integer (EISAID) CID to a string */

			acpi_ex_eisa_id_to_string(next_id_string,
						  cid_objects[i]->integer.
						  value);
			length = ACPI_EISAID_STRING_SIZE;
		} else {	/* ACPI_TYPE_STRING */

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

			ACPI_STRCPY(next_id_string,
				    cid_objects[i]->string.pointer);
			length = cid_objects[i]->string.length + 1;
		}

		cid_list->ids[i].string = next_id_string;
		cid_list->ids[i].length = length;
		next_id_string += length;
	}

	/* Finish the CID list */

	cid_list->count = count;
	cid_list->list_size = cid_list_size;
	*return_cid_list = cid_list;

cleanup:

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

	acpi_ut_remove_reference(obj_desc);
	return_ACPI_STATUS(status);
}