[mirror_ubuntu-artful-kernel.git] / drivers / acpi / acpica / nsconvert.c

/******************************************************************************
 *
 * Module Name: nsconvert - Object conversions for objects returned by
 *                          predefined methods
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, 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 "acnamesp.h"
#include "acinterp.h"
#include "acpredef.h"
#include "amlresrc.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsconvert")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_to_integer
 *
 * PARAMETERS:  original_object     - Object to be converted
 *              return_object       - Where the new converted object is returned
 *
 * RETURN:      Status. AE_OK if conversion was successful.
 *
 * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
 *
 ******************************************************************************/
acpi_status
acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
			   union acpi_operand_object **return_object)
{
	union acpi_operand_object *new_object;
	acpi_status status;
	u64 value = 0;
	u32 i;

	switch (original_object->common.type) {
	case ACPI_TYPE_STRING:

		/* String-to-Integer conversion */

		status = acpi_ut_strtoul64(original_object->string.pointer,
					   ACPI_ANY_BASE, &value);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
		break;

	case ACPI_TYPE_BUFFER:

		/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */

		if (original_object->buffer.length > 8) {
			return (AE_AML_OPERAND_TYPE);
		}

		/* Extract each buffer byte to create the integer */

		for (i = 0; i < original_object->buffer.length; i++) {
			value |=
			    ((u64)original_object->buffer.
			     pointer[i] << (i * 8));
		}
		break;

	default:

		return (AE_AML_OPERAND_TYPE);
	}

	new_object = acpi_ut_create_integer_object(value);
	if (!new_object) {
		return (AE_NO_MEMORY);
	}

	*return_object = new_object;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_to_string
 *
 * PARAMETERS:  original_object     - Object to be converted
 *              return_object       - Where the new converted object is returned
 *
 * RETURN:      Status. AE_OK if conversion was successful.
 *
 * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
 *
 ******************************************************************************/

acpi_status
acpi_ns_convert_to_string(union acpi_operand_object *original_object,
			  union acpi_operand_object **return_object)
{
	union acpi_operand_object *new_object;
	acpi_size length;
	acpi_status status;

	switch (original_object->common.type) {
	case ACPI_TYPE_INTEGER:
		/*
		 * Integer-to-String conversion. Commonly, convert
		 * an integer of value 0 to a NULL string. The last element of
		 * _BIF and _BIX packages occasionally need this fix.
		 */
		if (original_object->integer.value == 0) {

			/* Allocate a new NULL string object */

			new_object = acpi_ut_create_string_object(0);
			if (!new_object) {
				return (AE_NO_MEMORY);
			}
		} else {
			status =
			    acpi_ex_convert_to_string(original_object,
						      &new_object,
						      ACPI_IMPLICIT_CONVERT_HEX);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
		}
		break;

	case ACPI_TYPE_BUFFER:
		/*
		 * Buffer-to-String conversion. Use a to_string
		 * conversion, no transform performed on the buffer data. The best
		 * example of this is the _BIF method, where the string data from
		 * the battery is often (incorrectly) returned as buffer object(s).
		 */
		length = 0;
		while ((length < original_object->buffer.length) &&
		       (original_object->buffer.pointer[length])) {
			length++;
		}

		/* Allocate a new string object */

		new_object = acpi_ut_create_string_object(length);
		if (!new_object) {
			return (AE_NO_MEMORY);
		}

		/*
		 * Copy the raw buffer data with no transform. String is already NULL
		 * terminated at Length+1.
		 */
		ACPI_MEMCPY(new_object->string.pointer,
			    original_object->buffer.pointer, length);
		break;

	default:

		return (AE_AML_OPERAND_TYPE);
	}

	*return_object = new_object;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_to_buffer
 *
 * PARAMETERS:  original_object     - Object to be converted
 *              return_object       - Where the new converted object is returned
 *
 * RETURN:      Status. AE_OK if conversion was successful.
 *
 * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
 *
 ******************************************************************************/

acpi_status
acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
			  union acpi_operand_object **return_object)
{
	union acpi_operand_object *new_object;
	acpi_status status;
	union acpi_operand_object **elements;
	u32 *dword_buffer;
	u32 count;
	u32 i;

	switch (original_object->common.type) {
	case ACPI_TYPE_INTEGER:
		/*
		 * Integer-to-Buffer conversion.
		 * Convert the Integer to a packed-byte buffer. _MAT and other
		 * objects need this sometimes, if a read has been performed on a
		 * Field object that is less than or equal to the global integer
		 * size (32 or 64 bits).
		 */
		status =
		    acpi_ex_convert_to_buffer(original_object, &new_object);
		if (ACPI_FAILURE(status)) {
			return (status);
		}
		break;

	case ACPI_TYPE_STRING:

		/* String-to-Buffer conversion. Simple data copy */

		new_object =
		    acpi_ut_create_buffer_object(original_object->string.
						 length);
		if (!new_object) {
			return (AE_NO_MEMORY);
		}

		ACPI_MEMCPY(new_object->buffer.pointer,
			    original_object->string.pointer,
			    original_object->string.length);
		break;

	case ACPI_TYPE_PACKAGE:
		/*
		 * This case is often seen for predefined names that must return a
		 * Buffer object with multiple DWORD integers within. For example,
		 * _FDE and _GTM. The Package can be converted to a Buffer.
		 */

		/* All elements of the Package must be integers */

		elements = original_object->package.elements;
		count = original_object->package.count;

		for (i = 0; i < count; i++) {
			if ((!*elements) ||
			    ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
				return (AE_AML_OPERAND_TYPE);
			}
			elements++;
		}

		/* Create the new buffer object to replace the Package */

		new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
		if (!new_object) {
			return (AE_NO_MEMORY);
		}

		/* Copy the package elements (integers) to the buffer as DWORDs */

		elements = original_object->package.elements;
		dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);

		for (i = 0; i < count; i++) {
			*dword_buffer = (u32)(*elements)->integer.value;
			dword_buffer++;
			elements++;
		}
		break;

	default:

		return (AE_AML_OPERAND_TYPE);
	}

	*return_object = new_object;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_to_unicode
 *
 * PARAMETERS:  original_object     - ASCII String Object to be converted
 *              return_object       - Where the new converted object is returned
 *
 * RETURN:      Status. AE_OK if conversion was successful.
 *
 * DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
 *
 ******************************************************************************/

acpi_status
acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
			   union acpi_operand_object **return_object)
{
	union acpi_operand_object *new_object;
	char *ascii_string;
	u16 *unicode_buffer;
	u32 unicode_length;
	u32 i;

	if (!original_object) {
		return (AE_OK);
	}

	/* If a Buffer was returned, it must be at least two bytes long */

	if (original_object->common.type == ACPI_TYPE_BUFFER) {
		if (original_object->buffer.length < 2) {
			return (AE_AML_OPERAND_VALUE);
		}

		*return_object = NULL;
		return (AE_OK);
	}

	/*
	 * The original object is an ASCII string. Convert this string to
	 * a unicode buffer.
	 */
	ascii_string = original_object->string.pointer;
	unicode_length = (original_object->string.length * 2) + 2;

	/* Create a new buffer object for the Unicode data */

	new_object = acpi_ut_create_buffer_object(unicode_length);
	if (!new_object) {
		return (AE_NO_MEMORY);
	}

	unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);

	/* Convert ASCII to Unicode */

	for (i = 0; i < original_object->string.length; i++) {
		unicode_buffer[i] = (u16)ascii_string[i];
	}

	*return_object = new_object;
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_to_resource
 *
 * PARAMETERS:  original_object     - Object to be converted
 *              return_object       - Where the new converted object is returned
 *
 * RETURN:      Status. AE_OK if conversion was successful
 *
 * DESCRIPTION: Attempt to convert a Integer object to a resource_template
 *              Buffer.
 *
 ******************************************************************************/

acpi_status
acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
			    union acpi_operand_object **return_object)
{
	union acpi_operand_object *new_object;
	u8 *buffer;

	/*
	 * We can fix the following cases for an expected resource template:
	 * 1. No return value (interpreter slack mode is disabled)
	 * 2. A "Return (Zero)" statement
	 * 3. A "Return empty buffer" statement
	 *
	 * We will return a buffer containing a single end_tag
	 * resource descriptor.
	 */
	if (original_object) {
		switch (original_object->common.type) {
		case ACPI_TYPE_INTEGER:

			/* We can only repair an Integer==0 */

			if (original_object->integer.value) {
				return (AE_AML_OPERAND_TYPE);
			}
			break;

		case ACPI_TYPE_BUFFER:

			if (original_object->buffer.length) {

				/* Additional checks can be added in the future */

				*return_object = NULL;
				return (AE_OK);
			}
			break;

		case ACPI_TYPE_STRING:
		default:

			return (AE_AML_OPERAND_TYPE);
		}
	}

	/* Create the new buffer object for the resource descriptor */

	new_object = acpi_ut_create_buffer_object(2);
	if (!new_object) {
		return (AE_NO_MEMORY);
	}

	buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);

	/* Initialize the Buffer with a single end_tag descriptor */

	buffer[0] = (ACPI_RESOURCE_NAME_END_TAG | ASL_RDESC_END_TAG_SIZE);
	buffer[1] = 0x00;

	*return_object = new_object;
	return (AE_OK);
}
Commit	Line	Data
76a6225b BM	1	/******************************************************************************
	2	*
	3	* Module Name: nsconvert - Object conversions for objects returned by
	4	* predefined methods
	5	*
	6	*****************************************************************************/
	7
	8	/*
82a80941	9	* Copyright (C) 2000 - 2015, Intel Corp.
76a6225b BM	10	* All rights reserved.
	11	*
	12	* Redistribution and use in source and binary forms, with or without
	13	* modification, are permitted provided that the following conditions
	14	* are met:
	15	* 1. Redistributions of source code must retain the above copyright
	16	* notice, this list of conditions, and the following disclaimer,
	17	* without modification.
	18	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	19	* substantially similar to the "NO WARRANTY" disclaimer below
	20	* ("Disclaimer") and any redistribution must be conditioned upon
	21	* including a substantially similar Disclaimer requirement for further
	22	* binary redistribution.
	23	* 3. Neither the names of the above-listed copyright holders nor the names
	24	* of any contributors may be used to endorse or promote products derived
	25	* from this software without specific prior written permission.
	26	*
	27	* Alternatively, this software may be distributed under the terms of the
	28	* GNU General Public License ("GPL") version 2 as published by the Free
	29	* Software Foundation.
	30	*
	31	* NO WARRANTY
	32	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	33	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	34	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	35	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	36	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	37	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	38	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	39	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	40	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	41	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	42	* POSSIBILITY OF SUCH DAMAGES.
	43	*/
	44
	45	#include <acpi/acpi.h>
	46	#include "accommon.h"
	47	#include "acnamesp.h"
	48	#include "acinterp.h"
	49	#include "acpredef.h"
	50	#include "amlresrc.h"
	51
	52	#define _COMPONENT ACPI_NAMESPACE
	53	ACPI_MODULE_NAME("nsconvert")
	54
	55	/*******************************************************************************
	56	*
	57	* FUNCTION: acpi_ns_convert_to_integer
	58	*
	59	* PARAMETERS: original_object - Object to be converted
	60	* return_object - Where the new converted object is returned
	61	*
	62	* RETURN: Status. AE_OK if conversion was successful.
	63	*
	64	* DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
	65	*
	66	******************************************************************************/
	67	acpi_status
	68	acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
	69	union acpi_operand_object **return_object)
	70	{
	71	union acpi_operand_object *new_object;
	72	acpi_status status;
	73	u64 value = 0;
74	u32 i;
75
76	switch (original_object->common.type) {
77	case ACPI_TYPE_STRING:
78
79	/* String-to-Integer conversion */
80
81	status = acpi_ut_strtoul64(original_object->string.pointer,
82	ACPI_ANY_BASE, &value);
83	if (ACPI_FAILURE(status)) {
84	return (status);
85	}
86	break;
87
88	case ACPI_TYPE_BUFFER:
89
90	/* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
91
92	if (original_object->buffer.length > 8) {
93	return (AE_AML_OPERAND_TYPE);
94	}
95
96	/* Extract each buffer byte to create the integer */
97
98	for (i = 0; i < original_object->buffer.length; i++) {
99	value \|=
100	((u64)original_object->buffer.
101	pointer[i] << (i * 8));
102	}
103	break;
104
105	default:
1d1ea1b7	106
76a6225b BM	107	return (AE_AML_OPERAND_TYPE);
	108	}
	109
	110	new_object = acpi_ut_create_integer_object(value);
	111	if (!new_object) {
	112	return (AE_NO_MEMORY);
	113	}
	114
	115	*return_object = new_object;
	116	return (AE_OK);
	117	}
	118
	119	/*******************************************************************************
	120	*
	121	* FUNCTION: acpi_ns_convert_to_string
	122	*
	123	* PARAMETERS: original_object - Object to be converted
	124	* return_object - Where the new converted object is returned
	125	*
	126	* RETURN: Status. AE_OK if conversion was successful.
	127	*
	128	* DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
	129	*
	130	******************************************************************************/
	131
	132	acpi_status
	133	acpi_ns_convert_to_string(union acpi_operand_object *original_object,
	134	union acpi_operand_object **return_object)
	135	{
	136	union acpi_operand_object *new_object;
	137	acpi_size length;
	138	acpi_status status;
	139
	140	switch (original_object->common.type) {
	141	case ACPI_TYPE_INTEGER:
	142	/*
	143	* Integer-to-String conversion. Commonly, convert
	144	* an integer of value 0 to a NULL string. The last element of
	145	* _BIF and _BIX packages occasionally need this fix.
	146	*/
	147	if (original_object->integer.value == 0) {
	148
	149	/* Allocate a new NULL string object */
	150
	151	new_object = acpi_ut_create_string_object(0);
	152	if (!new_object) {
	153	return (AE_NO_MEMORY);
	154	}
	155	} else {
	156	status =
	157	acpi_ex_convert_to_string(original_object,
	158	&new_object,
	159	ACPI_IMPLICIT_CONVERT_HEX);
	160	if (ACPI_FAILURE(status)) {
	161	return (status);
	162	}
	163	}
	164	break;
	165
	166	case ACPI_TYPE_BUFFER:
	167	/*
	168	* Buffer-to-String conversion. Use a to_string
	169	* conversion, no transform performed on the buffer data. The best
	170	* example of this is the _BIF method, where the string data from
171	* the battery is often (incorrectly) returned as buffer object(s).
172	*/
173	length = 0;
174	while ((length < original_object->buffer.length) &&
175	(original_object->buffer.pointer[length])) {
176	length++;
177	}
178
179	/* Allocate a new string object */
180
181	new_object = acpi_ut_create_string_object(length);
182	if (!new_object) {
183	return (AE_NO_MEMORY);
184	}
185
186	/*
187	* Copy the raw buffer data with no transform. String is already NULL
188	* terminated at Length+1.
189	*/
190	ACPI_MEMCPY(new_object->string.pointer,
191	original_object->buffer.pointer, length);
192	break;
193
194	default:
1d1ea1b7	195
76a6225b BM	196	return (AE_AML_OPERAND_TYPE);
	197	}
	198
	199	*return_object = new_object;
	200	return (AE_OK);
	201	}
	202
	203	/*******************************************************************************
	204	*
	205	* FUNCTION: acpi_ns_convert_to_buffer
	206	*
	207	* PARAMETERS: original_object - Object to be converted
	208	* return_object - Where the new converted object is returned
	209	*
	210	* RETURN: Status. AE_OK if conversion was successful.
	211	*
	212	* DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
	213	*
	214	******************************************************************************/
	215
	216	acpi_status
	217	acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
	218	union acpi_operand_object **return_object)
	219	{
	220	union acpi_operand_object *new_object;
	221	acpi_status status;
	222	union acpi_operand_object **elements;
	223	u32 *dword_buffer;
	224	u32 count;
	225	u32 i;
	226
	227	switch (original_object->common.type) {
	228	case ACPI_TYPE_INTEGER:
	229	/*
	230	* Integer-to-Buffer conversion.
	231	* Convert the Integer to a packed-byte buffer. _MAT and other
	232	* objects need this sometimes, if a read has been performed on a
	233	* Field object that is less than or equal to the global integer
	234	* size (32 or 64 bits).
	235	*/
	236	status =
	237	acpi_ex_convert_to_buffer(original_object, &new_object);
	238	if (ACPI_FAILURE(status)) {
	239	return (status);
	240	}
	241	break;
	242
	243	case ACPI_TYPE_STRING:
	244
	245	/* String-to-Buffer conversion. Simple data copy */
	246
	247	new_object =
	248	acpi_ut_create_buffer_object(original_object->string.
	249	length);
	250	if (!new_object) {
	251	return (AE_NO_MEMORY);
	252	}
	253
	254	ACPI_MEMCPY(new_object->buffer.pointer,
	255	original_object->string.pointer,
	256	original_object->string.length);
	257	break;
	258
	259	case ACPI_TYPE_PACKAGE:
260	/*
261	* This case is often seen for predefined names that must return a
262	* Buffer object with multiple DWORD integers within. For example,
263	* _FDE and _GTM. The Package can be converted to a Buffer.
264	*/
265
266	/* All elements of the Package must be integers */
267
268	elements = original_object->package.elements;
269	count = original_object->package.count;
270
271	for (i = 0; i < count; i++) {
272	if ((!*elements) \|\|
273	((*elements)->common.type != ACPI_TYPE_INTEGER)) {
274	return (AE_AML_OPERAND_TYPE);
275	}
276	elements++;
277	}
278
279	/* Create the new buffer object to replace the Package */
280
281	new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
282	if (!new_object) {
283	return (AE_NO_MEMORY);
284	}
285
286	/* Copy the package elements (integers) to the buffer as DWORDs */
287
288	elements = original_object->package.elements;
289	dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
290
291	for (i = 0; i < count; i++) {
292	dword_buffer = (u32)(elements)->integer.value;
293	dword_buffer++;
294	elements++;
295	}
296	break;
297
298	default:
1d1ea1b7	299
76a6225b BM	300	return (AE_AML_OPERAND_TYPE);
	301	}
	302
	303	*return_object = new_object;
	304	return (AE_OK);
	305	}
96b44cc6 LZ	306
	307	/*******************************************************************************
	308	*
	309	* FUNCTION: acpi_ns_convert_to_unicode
	310	*
	311	* PARAMETERS: original_object - ASCII String Object to be converted
	312	* return_object - Where the new converted object is returned
	313	*
	314	* RETURN: Status. AE_OK if conversion was successful.
	315	*
	316	* DESCRIPTION: Attempt to convert a String object to a Unicode string Buffer.
	317	*
	318	******************************************************************************/
	319
	320	acpi_status
	321	acpi_ns_convert_to_unicode(union acpi_operand_object *original_object,
	322	union acpi_operand_object **return_object)
	323	{
	324	union acpi_operand_object *new_object;
	325	char *ascii_string;
	326	u16 *unicode_buffer;
	327	u32 unicode_length;
	328	u32 i;
	329
	330	if (!original_object) {
	331	return (AE_OK);
	332	}
	333
	334	/* If a Buffer was returned, it must be at least two bytes long */
	335
	336	if (original_object->common.type == ACPI_TYPE_BUFFER) {
	337	if (original_object->buffer.length < 2) {
	338	return (AE_AML_OPERAND_VALUE);
	339	}
	340
	341	*return_object = NULL;
	342	return (AE_OK);
	343	}
	344
	345	/*
	346	* The original object is an ASCII string. Convert this string to
	347	* a unicode buffer.
	348	*/
	349	ascii_string = original_object->string.pointer;
	350	unicode_length = (original_object->string.length * 2) + 2;
	351
	352	/* Create a new buffer object for the Unicode data */
	353
	354	new_object = acpi_ut_create_buffer_object(unicode_length);
	355	if (!new_object) {
	356	return (AE_NO_MEMORY);
	357	}
	358
	359	unicode_buffer = ACPI_CAST_PTR(u16, new_object->buffer.pointer);
	360
	361	/* Convert ASCII to Unicode */
	362
	363	for (i = 0; i < original_object->string.length; i++) {
	364	unicode_buffer[i] = (u16)ascii_string[i];
	365	}
	366
	367	*return_object = new_object;
	368	return (AE_OK);
	369	}
88fd0ac8 LZ	370
	371	/*******************************************************************************
	372	*
	373	* FUNCTION: acpi_ns_convert_to_resource
	374	*
	375	* PARAMETERS: original_object - Object to be converted
	376	* return_object - Where the new converted object is returned
	377	*
	378	* RETURN: Status. AE_OK if conversion was successful
	379	*
	380	* DESCRIPTION: Attempt to convert a Integer object to a resource_template
	381	* Buffer.
	382	*
	383	******************************************************************************/
	384
	385	acpi_status
	386	acpi_ns_convert_to_resource(union acpi_operand_object *original_object,
	387	union acpi_operand_object **return_object)
	388	{
	389	union acpi_operand_object *new_object;
	390	u8 *buffer;
	391
	392	/*
	393	* We can fix the following cases for an expected resource template:
	394	* 1. No return value (interpreter slack mode is disabled)
	395	* 2. A "Return (Zero)" statement
	396	* 3. A "Return empty buffer" statement
	397	*
	398	* We will return a buffer containing a single end_tag
	399	* resource descriptor.
	400	*/
	401	if (original_object) {
	402	switch (original_object->common.type) {
	403	case ACPI_TYPE_INTEGER:
	404
	405	/* We can only repair an Integer==0 */
	406
	407	if (original_object->integer.value) {
	408	return (AE_AML_OPERAND_TYPE);
	409	}
	410	break;
	411
	412	case ACPI_TYPE_BUFFER:
	413
	414	if (original_object->buffer.length) {
	415
	416	/* Additional checks can be added in the future */
	417
	418	*return_object = NULL;
	419	return (AE_OK);
	420	}
	421	break;
	422
	423	case ACPI_TYPE_STRING:
	424	default:
	425
	426	return (AE_AML_OPERAND_TYPE);
	427	}
	428	}
	429
	430	/* Create the new buffer object for the resource descriptor */
	431
	432	new_object = acpi_ut_create_buffer_object(2);
	433	if (!new_object) {
434	return (AE_NO_MEMORY);
435	}
436
437	buffer = ACPI_CAST_PTR(u8, new_object->buffer.pointer);
438
439	/* Initialize the Buffer with a single end_tag descriptor */
440
441	buffer[0] = (ACPI_RESOURCE_NAME_END_TAG \| ASL_RDESC_END_TAG_SIZE);
442	buffer[1] = 0x00;
443
444	*return_object = new_object;
445	return (AE_OK);
446	}