[linux-2.6-block.git] / drivers / acpi / utils.c

/*
 *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("acpi_utils")

/* --------------------------------------------------------------------------
                            Object Evaluation Helpers
   -------------------------------------------------------------------------- */
#ifdef ACPI_DEBUG_OUTPUT
#define acpi_util_eval_error(h,p,s) {\
	char prefix[80] = {'\0'};\
	struct acpi_buffer buffer = {sizeof(prefix), prefix};\
	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\
		(char *) prefix, p, acpi_format_exception(s))); }
#else
#define acpi_util_eval_error(h,p,s)
#endif
acpi_status
acpi_extract_package(union acpi_object *package,
		     struct acpi_buffer *format, struct acpi_buffer *buffer)
{
	u32 size_required = 0;
	u32 tail_offset = 0;
	char *format_string = NULL;
	u32 format_count = 0;
	u32 i = 0;
	u8 *head = NULL;
	u8 *tail = NULL;


	if (!package || (package->type != ACPI_TYPE_PACKAGE)
	    || (package->package.count < 1)) {
		printk(KERN_WARNING PREFIX "Invalid package argument\n");
		return AE_BAD_PARAMETER;
	}

	if (!format || !format->pointer || (format->length < 1)) {
		printk(KERN_WARNING PREFIX "Invalid format argument\n");
		return AE_BAD_PARAMETER;
	}

	if (!buffer) {
		printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
		return AE_BAD_PARAMETER;
	}

	format_count = (format->length / sizeof(char)) - 1;
	if (format_count > package->package.count) {
		printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
			      " than exist in package [%d].\n",
			      format_count, package->package.count);
		return AE_BAD_DATA;
	}

	format_string = format->pointer;

	/*
	 * Calculate size_required.
	 */
	for (i = 0; i < format_count; i++) {

		union acpi_object *element = &(package->package.elements[i]);

		if (!element) {
			return AE_BAD_DATA;
		}

		switch (element->type) {

		case ACPI_TYPE_INTEGER:
			switch (format_string[i]) {
			case 'N':
				size_required += sizeof(acpi_integer);
				tail_offset += sizeof(acpi_integer);
				break;
			case 'S':
				size_required +=
				    sizeof(char *) + sizeof(acpi_integer) +
				    sizeof(char);
				tail_offset += sizeof(char *);
				break;
			default:
				printk(KERN_WARNING PREFIX "Invalid package element"
					      " [%d]: got number, expecing"
					      " [%c]\n",
					      i, format_string[i]);
				return AE_BAD_DATA;
				break;
			}
			break;

		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:
			switch (format_string[i]) {
			case 'S':
				size_required +=
				    sizeof(char *) +
				    (element->string.length * sizeof(char)) +
				    sizeof(char);
				tail_offset += sizeof(char *);
				break;
			case 'B':
				size_required +=
				    sizeof(u8 *) +
				    (element->buffer.length * sizeof(u8));
				tail_offset += sizeof(u8 *);
				break;
			default:
				printk(KERN_WARNING PREFIX "Invalid package element"
					      " [%d] got string/buffer,"
					      " expecing [%c]\n",
					      i, format_string[i]);
				return AE_BAD_DATA;
				break;
			}
			break;

		case ACPI_TYPE_PACKAGE:
		default:
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Found unsupported element at index=%d\n",
					  i));
			/* TBD: handle nested packages... */
			return AE_SUPPORT;
			break;
		}
	}

	/*
	 * Validate output buffer.
	 */
	if (buffer->length < size_required) {
		buffer->length = size_required;
		return AE_BUFFER_OVERFLOW;
	} else if (buffer->length != size_required || !buffer->pointer) {
		return AE_BAD_PARAMETER;
	}

	head = buffer->pointer;
	tail = buffer->pointer + tail_offset;

	/*
	 * Extract package data.
	 */
	for (i = 0; i < format_count; i++) {

		u8 **pointer = NULL;
		union acpi_object *element = &(package->package.elements[i]);

		if (!element) {
			return AE_BAD_DATA;
		}

		switch (element->type) {

		case ACPI_TYPE_INTEGER:
			switch (format_string[i]) {
			case 'N':
				*((acpi_integer *) head) =
				    element->integer.value;
				head += sizeof(acpi_integer);
				break;
			case 'S':
				pointer = (u8 **) head;
				*pointer = tail;
				*((acpi_integer *) tail) =
				    element->integer.value;
				head += sizeof(acpi_integer *);
				tail += sizeof(acpi_integer);
				/* NULL terminate string */
				*tail = (char)0;
				tail += sizeof(char);
				break;
			default:
				/* Should never get here */
				break;
			}
			break;

		case ACPI_TYPE_STRING:
		case ACPI_TYPE_BUFFER:
			switch (format_string[i]) {
			case 'S':
				pointer = (u8 **) head;
				*pointer = tail;
				memcpy(tail, element->string.pointer,
				       element->string.length);
				head += sizeof(char *);
				tail += element->string.length * sizeof(char);
				/* NULL terminate string */
				*tail = (char)0;
				tail += sizeof(char);
				break;
			case 'B':
				pointer = (u8 **) head;
				*pointer = tail;
				memcpy(tail, element->buffer.pointer,
				       element->buffer.length);
				head += sizeof(u8 *);
				tail += element->buffer.length * sizeof(u8);
				break;
			default:
				/* Should never get here */
				break;
			}
			break;

		case ACPI_TYPE_PACKAGE:
			/* TBD: handle nested packages... */
		default:
			/* Should never get here */
			break;
		}
	}

	return AE_OK;
}

EXPORT_SYMBOL(acpi_extract_package);

acpi_status
acpi_evaluate_integer(acpi_handle handle,
		      acpi_string pathname,
		      struct acpi_object_list *arguments, unsigned long *data)
{
	acpi_status status = AE_OK;
	union acpi_object *element;
	struct acpi_buffer buffer = { 0, NULL };


	if (!data)
		return AE_BAD_PARAMETER;

	element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
	if (!element)
		return AE_NO_MEMORY;

	buffer.length = sizeof(union acpi_object);
	buffer.pointer = element;
	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_util_eval_error(handle, pathname, status);
		kfree(element);
		return status;
	}

	if (element->type != ACPI_TYPE_INTEGER) {
		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
		kfree(element);
		return AE_BAD_DATA;
	}

	*data = element->integer.value;
	kfree(element);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data));

	return AE_OK;
}

EXPORT_SYMBOL(acpi_evaluate_integer);

#if 0
acpi_status
acpi_evaluate_string(acpi_handle handle,
		     acpi_string pathname,
		     acpi_object_list * arguments, acpi_string * data)
{
	acpi_status status = AE_OK;
	acpi_object *element = NULL;
	acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };


	if (!data)
		return AE_BAD_PARAMETER;

	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	if (ACPI_FAILURE(status)) {
		acpi_util_eval_error(handle, pathname, status);
		return status;
	}

	element = (acpi_object *) buffer.pointer;

	if ((element->type != ACPI_TYPE_STRING)
	    || (element->type != ACPI_TYPE_BUFFER)
	    || !element->string.length) {
		acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
		return AE_BAD_DATA;
	}

	*data = kzalloc(element->string.length + 1, GFP_KERNEL);
	if (!data) {
		printk(KERN_ERR PREFIX "Memory allocation\n");
		return -ENOMEM;
	}

	memcpy(*data, element->string.pointer, element->string.length);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));

	kfree(buffer.pointer);

	return AE_OK;
}
#endif

acpi_status
acpi_evaluate_reference(acpi_handle handle,
			acpi_string pathname,
			struct acpi_object_list *arguments,
			struct acpi_handle_list *list)
{
	acpi_status status = AE_OK;
	union acpi_object *package = NULL;
	union acpi_object *element = NULL;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	u32 i = 0;


	if (!list) {
		return AE_BAD_PARAMETER;
	}

	/* Evaluate object. */

	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	if (ACPI_FAILURE(status))
		goto end;

	package = buffer.pointer;

	if ((buffer.length == 0) || !package) {
		printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
			    (unsigned)buffer.length, package);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}
	if (package->type != ACPI_TYPE_PACKAGE) {
		printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
			    package->type);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}
	if (!package->package.count) {
		printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
			    package);
		status = AE_BAD_DATA;
		acpi_util_eval_error(handle, pathname, status);
		goto end;
	}

	if (package->package.count > ACPI_MAX_HANDLES) {
		return AE_NO_MEMORY;
	}
	list->count = package->package.count;

	/* Extract package data. */

	for (i = 0; i < list->count; i++) {

		element = &(package->package.elements[i]);

		if (element->type != ACPI_TYPE_ANY) {
			status = AE_BAD_DATA;
			printk(KERN_ERR PREFIX
				    "Expecting a [Reference] package element, found type %X\n",
				    element->type);
			acpi_util_eval_error(handle, pathname, status);
			break;
		}

		/* Get the  acpi_handle. */

		list->handles[i] = element->reference.handle;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
				  list->handles[i]));
	}

      end:
	if (ACPI_FAILURE(status)) {
		list->count = 0;
		//kfree(list->handles);
	}

	kfree(buffer.pointer);

	return status;
}

EXPORT_SYMBOL(acpi_evaluate_reference);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	22	*
	23	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/types.h>
	30	#include <acpi/acpi_bus.h>
	31	#include <acpi/acpi_drivers.h>
	32
1da177e4	33	#define _COMPONENT ACPI_BUS_COMPONENT
4be44fcd	34	ACPI_MODULE_NAME("acpi_utils")
1da177e4 LT	35
	36	/* --------------------------------------------------------------------------
	37	Object Evaluation Helpers
	38	-------------------------------------------------------------------------- */
1da177e4 LT	39	#ifdef ACPI_DEBUG_OUTPUT
	40	#define acpi_util_eval_error(h,p,s) {\
	41	char prefix[80] = {'\0'};\
	42	struct acpi_buffer buffer = {sizeof(prefix), prefix};\
	43	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);\
	44	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",\
	45	(char *) prefix, p, acpi_format_exception(s))); }
	46	#else
	47	#define acpi_util_eval_error(h,p,s)
	48	#endif
1da177e4	49	acpi_status
4be44fcd LB	50	acpi_extract_package(union acpi_object *package,
4be44fcd LB	51	struct acpi_buffer format, struct acpi_buffer buffer)
1da177e4	52	{
4be44fcd LB	53	u32 size_required = 0;
	54	u32 tail_offset = 0;
	55	char *format_string = NULL;
	56	u32 format_count = 0;
	57	u32 i = 0;
	58	u8 *head = NULL;
	59	u8 *tail = NULL;
1da177e4	60
1da177e4	61
4be44fcd LB	62	if (!package \|\| (package->type != ACPI_TYPE_PACKAGE)
4be44fcd LB	63	\|\| (package->package.count < 1)) {
cece9296	64	printk(KERN_WARNING PREFIX "Invalid package argument\n");
d550d98d	65	return AE_BAD_PARAMETER;
1da177e4 LT	66	}
	67
	68	if (!format \|\| !format->pointer \|\| (format->length < 1)) {
cece9296	69	printk(KERN_WARNING PREFIX "Invalid format argument\n");
d550d98d	70	return AE_BAD_PARAMETER;
1da177e4 LT	71	}
	72
	73	if (!buffer) {
cece9296	74	printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
d550d98d	75	return AE_BAD_PARAMETER;
1da177e4 LT	76	}
1da177e4 LT	77
4be44fcd	78	format_count = (format->length / sizeof(char)) - 1;
1da177e4	79	if (format_count > package->package.count) {
cece9296 LB	80	printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
	81	" than exist in package [%d].\n",
	82	format_count, package->package.count);
d550d98d	83	return AE_BAD_DATA;
1da177e4 LT	84	}
1da177e4 LT	85
50dd0969	86	format_string = format->pointer;
1da177e4 LT	87
	88	/*
	89	* Calculate size_required.
	90	*/
4be44fcd	91	for (i = 0; i < format_count; i++) {
1da177e4 LT	92
	93	union acpi_object *element = &(package->package.elements[i]);
	94
	95	if (!element) {
d550d98d	96	return AE_BAD_DATA;
1da177e4 LT	97	}
	98
	99	switch (element->type) {
	100
	101	case ACPI_TYPE_INTEGER:
	102	switch (format_string[i]) {
	103	case 'N':
	104	size_required += sizeof(acpi_integer);
	105	tail_offset += sizeof(acpi_integer);
	106	break;
	107	case 'S':
4be44fcd LB	108	size_required +=
	109	sizeof(char *) + sizeof(acpi_integer) +
	110	sizeof(char);
	111	tail_offset += sizeof(char *);
1da177e4 LT	112	break;
1da177e4 LT	113	default:
cece9296	114	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	115	" [%d]: got number, expecing"
cece9296 LB	116	" [%c]\n",
cece9296 LB	117	i, format_string[i]);
d550d98d	118	return AE_BAD_DATA;
1da177e4 LT	119	break;
	120	}
	121	break;
	122
	123	case ACPI_TYPE_STRING:
	124	case ACPI_TYPE_BUFFER:
	125	switch (format_string[i]) {
	126	case 'S':
4be44fcd LB	127	size_required +=
	128	sizeof(char *) +
	129	(element->string.length * sizeof(char)) +
	130	sizeof(char);
	131	tail_offset += sizeof(char *);
1da177e4 LT	132	break;
1da177e4 LT	133	case 'B':
4be44fcd LB	134	size_required +=
	135	sizeof(u8 *) +
	136	(element->buffer.length * sizeof(u8));
	137	tail_offset += sizeof(u8 *);
1da177e4 LT	138	break;
1da177e4 LT	139	default:
cece9296	140	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	141	" [%d] got string/buffer,"
cece9296 LB	142	" expecing [%c]\n",
cece9296 LB	143	i, format_string[i]);
d550d98d	144	return AE_BAD_DATA;
1da177e4 LT	145	break;
	146	}
	147	break;
	148
	149	case ACPI_TYPE_PACKAGE:
	150	default:
4be44fcd LB	151	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	152	"Found unsupported element at index=%d\n",
	153	i));
1da177e4	154	/* TBD: handle nested packages... */
d550d98d	155	return AE_SUPPORT;
1da177e4 LT	156	break;
	157	}
	158	}
	159
	160	/*
	161	* Validate output buffer.
	162	*/
	163	if (buffer->length < size_required) {
	164	buffer->length = size_required;
d550d98d	165	return AE_BUFFER_OVERFLOW;
4be44fcd	166	} else if (buffer->length != size_required \|\| !buffer->pointer) {
d550d98d	167	return AE_BAD_PARAMETER;
1da177e4 LT	168	}
	169
	170	head = buffer->pointer;
	171	tail = buffer->pointer + tail_offset;
	172
	173	/*
	174	* Extract package data.
	175	*/
4be44fcd	176	for (i = 0; i < format_count; i++) {
1da177e4 LT	177
	178	u8 **pointer = NULL;
	179	union acpi_object *element = &(package->package.elements[i]);
	180
	181	if (!element) {
d550d98d	182	return AE_BAD_DATA;
1da177e4 LT	183	}
	184
	185	switch (element->type) {
	186
	187	case ACPI_TYPE_INTEGER:
	188	switch (format_string[i]) {
	189	case 'N':
4be44fcd LB	190	((acpi_integer ) head) =
4be44fcd LB	191	element->integer.value;
1da177e4 LT	192	head += sizeof(acpi_integer);
	193	break;
	194	case 'S':
4be44fcd	195	pointer = (u8 **) head;
1da177e4	196	*pointer = tail;
4be44fcd LB	197	((acpi_integer ) tail) =
	198	element->integer.value;
	199	head += sizeof(acpi_integer *);
1da177e4 LT	200	tail += sizeof(acpi_integer);
	201	/* NULL terminate string */
	202	*tail = (char)0;
	203	tail += sizeof(char);
	204	break;
	205	default:
	206	/* Should never get here */
	207	break;
	208	}
	209	break;
	210
	211	case ACPI_TYPE_STRING:
	212	case ACPI_TYPE_BUFFER:
	213	switch (format_string[i]) {
	214	case 'S':
4be44fcd	215	pointer = (u8 **) head;
1da177e4	216	*pointer = tail;
4be44fcd LB	217	memcpy(tail, element->string.pointer,
	218	element->string.length);
	219	head += sizeof(char *);
1da177e4 LT	220	tail += element->string.length * sizeof(char);
	221	/* NULL terminate string */
	222	*tail = (char)0;
	223	tail += sizeof(char);
	224	break;
	225	case 'B':
4be44fcd	226	pointer = (u8 **) head;
1da177e4	227	*pointer = tail;
4be44fcd LB	228	memcpy(tail, element->buffer.pointer,
	229	element->buffer.length);
	230	head += sizeof(u8 *);
1da177e4 LT	231	tail += element->buffer.length * sizeof(u8);
	232	break;
	233	default:
	234	/* Should never get here */
	235	break;
	236	}
	237	break;
	238
	239	case ACPI_TYPE_PACKAGE:
	240	/* TBD: handle nested packages... */
	241	default:
	242	/* Should never get here */
	243	break;
	244	}
	245	}
	246
d550d98d	247	return AE_OK;
1da177e4	248	}
1da177e4	249
4be44fcd	250	EXPORT_SYMBOL(acpi_extract_package);
1da177e4 LT	251
1da177e4 LT	252	acpi_status
4be44fcd LB	253	acpi_evaluate_integer(acpi_handle handle,
	254	acpi_string pathname,
	255	struct acpi_object_list arguments, unsigned long data)
1da177e4	256	{
4be44fcd LB	257	acpi_status status = AE_OK;
	258	union acpi_object *element;
	259	struct acpi_buffer buffer = { 0, NULL };
1da177e4	260
1da177e4 LT	261
1da177e4 LT	262	if (!data)
d550d98d	263	return AE_BAD_PARAMETER;
1da177e4	264
36bcbec7	265	element = kzalloc(sizeof(union acpi_object), irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
4be44fcd	266	if (!element)
d550d98d	267	return AE_NO_MEMORY;
1da177e4	268
1da177e4 LT	269	buffer.length = sizeof(union acpi_object);
	270	buffer.pointer = element;
	271	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	272	if (ACPI_FAILURE(status)) {
	273	acpi_util_eval_error(handle, pathname, status);
64385f2f	274	kfree(element);
d550d98d	275	return status;
1da177e4 LT	276	}
	277
	278	if (element->type != ACPI_TYPE_INTEGER) {
	279	acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
64385f2f	280	kfree(element);
d550d98d	281	return AE_BAD_DATA;
1da177e4 LT	282	}
	283
	284	*data = element->integer.value;
	285	kfree(element);
	286
	287	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%lu]\n", *data));
	288
d550d98d	289	return AE_OK;
1da177e4	290	}
1da177e4	291
4be44fcd	292	EXPORT_SYMBOL(acpi_evaluate_integer);
1da177e4 LT	293
	294	#if 0
	295	acpi_status
4be44fcd LB	296	acpi_evaluate_string(acpi_handle handle,
	297	acpi_string pathname,
	298	acpi_object_list * arguments, acpi_string * data)
1da177e4	299	{
4be44fcd LB	300	acpi_status status = AE_OK;
	301	acpi_object *element = NULL;
	302	acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4	303
1da177e4 LT	304
1da177e4 LT	305	if (!data)
d550d98d	306	return AE_BAD_PARAMETER;
1da177e4 LT	307
	308	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	309	if (ACPI_FAILURE(status)) {
	310	acpi_util_eval_error(handle, pathname, status);
d550d98d	311	return status;
1da177e4 LT	312	}
	313
	314	element = (acpi_object *) buffer.pointer;
	315
4be44fcd LB	316	if ((element->type != ACPI_TYPE_STRING)
	317	\|\| (element->type != ACPI_TYPE_BUFFER)
	318	\|\| !element->string.length) {
1da177e4	319	acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
d550d98d	320	return AE_BAD_DATA;
1da177e4 LT	321	}
1da177e4 LT	322
36bcbec7	323	*data = kzalloc(element->string.length + 1, GFP_KERNEL);
1da177e4	324	if (!data) {
6468463a	325	printk(KERN_ERR PREFIX "Memory allocation\n");
d550d98d	326	return -ENOMEM;
1da177e4	327	}
1da177e4 LT	328
	329	memcpy(*data, element->string.pointer, element->string.length);
	330
	331	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
	332
02438d87	333	kfree(buffer.pointer);
1da177e4	334
d550d98d	335	return AE_OK;
1da177e4 LT	336	}
	337	#endif
	338
1da177e4	339	acpi_status
4be44fcd LB	340	acpi_evaluate_reference(acpi_handle handle,
	341	acpi_string pathname,
	342	struct acpi_object_list *arguments,
	343	struct acpi_handle_list *list)
1da177e4	344	{
4be44fcd LB	345	acpi_status status = AE_OK;
	346	union acpi_object *package = NULL;
	347	union acpi_object *element = NULL;
	348	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	349	u32 i = 0;
1da177e4	350
1da177e4 LT	351
1da177e4 LT	352	if (!list) {
d550d98d	353	return AE_BAD_PARAMETER;
1da177e4 LT	354	}
	355
	356	/* Evaluate object. */
	357
	358	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	359	if (ACPI_FAILURE(status))
	360	goto end;
	361
50dd0969	362	package = buffer.pointer;
1da177e4 LT	363
1da177e4 LT	364	if ((buffer.length == 0) \|\| !package) {
6468463a LB	365	printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
6468463a LB	366	(unsigned)buffer.length, package);
1da177e4 LT	367	status = AE_BAD_DATA;
	368	acpi_util_eval_error(handle, pathname, status);
	369	goto end;
	370	}
	371	if (package->type != ACPI_TYPE_PACKAGE) {
6468463a LB	372	printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
6468463a LB	373	package->type);
1da177e4 LT	374	status = AE_BAD_DATA;
	375	acpi_util_eval_error(handle, pathname, status);
	376	goto end;
	377	}
	378	if (!package->package.count) {
6468463a LB	379	printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
6468463a LB	380	package);
1da177e4 LT	381	status = AE_BAD_DATA;
	382	acpi_util_eval_error(handle, pathname, status);
	383	goto end;
	384	}
	385
	386	if (package->package.count > ACPI_MAX_HANDLES) {
d550d98d	387	return AE_NO_MEMORY;
1da177e4 LT	388	}
	389	list->count = package->package.count;
	390
	391	/* Extract package data. */
	392
	393	for (i = 0; i < list->count; i++) {
	394
	395	element = &(package->package.elements[i]);
	396
	397	if (element->type != ACPI_TYPE_ANY) {
	398	status = AE_BAD_DATA;
6468463a LB	399	printk(KERN_ERR PREFIX
	400	"Expecting a [Reference] package element, found type %X\n",
	401	element->type);
1da177e4 LT	402	acpi_util_eval_error(handle, pathname, status);
	403	break;
	404	}
	405
	406	/* Get the acpi_handle. */
	407
	408	list->handles[i] = element->reference.handle;
	409	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
4be44fcd	410	list->handles[i]));
1da177e4 LT	411	}
1da177e4 LT	412
4be44fcd	413	end:
1da177e4 LT	414	if (ACPI_FAILURE(status)) {
	415	list->count = 0;
	416	//kfree(list->handles);
	417	}
	418
02438d87	419	kfree(buffer.pointer);
1da177e4	420
d550d98d	421	return status;
1da177e4	422	}
1da177e4	423
4be44fcd	424	EXPORT_SYMBOL(acpi_evaluate_reference);