[linux.git] / drivers / acpi / utils.c

/*
 *  acpi_utils.c - ACPI Utility Functions ($Revision: 10 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include "internal.h"

#define _COMPONENT		ACPI_BUS_COMPONENT
ACPI_MODULE_NAME("utils");

/* --------------------------------------------------------------------------
                            Object Evaluation Helpers
   -------------------------------------------------------------------------- */
static void
acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
{
#ifdef ACPI_DEBUG_OUTPUT
	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
	return;
#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(u64);
				tail_offset += sizeof(u64);
				break;
			case 'S':
				size_required +=
				    sizeof(char *) + sizeof(u64) +
				    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':
				*((u64 *) head) =
				    element->integer.value;
				head += sizeof(u64);
				break;
			case 'S':
				pointer = (u8 **) head;
				*pointer = tail;
				*((u64 *) tail) =
				    element->integer.value;
				head += sizeof(u64 *);
				tail += sizeof(u64);
				/* 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 long *data)
{
	acpi_status status = AE_OK;
	union acpi_object element;
	struct acpi_buffer buffer = { 0, NULL };

	if (!data)
		return AE_BAD_PARAMETER;

	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);
		return status;
	}

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

	*data = element.integer.value;

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

	return AE_OK;
}

EXPORT_SYMBOL(acpi_evaluate_integer);

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_LOCAL_REFERENCE) {
			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;
		}

		if (!element->reference.handle) {
			printk(KERN_WARNING PREFIX "Invalid reference in"
			       " package %s\n", pathname);
			status = AE_NULL_ENTRY;
			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 <[email protected]>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
	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>
5a0e3ad6	28	#include <linux/slab.h>
1da177e4 LT	29	#include <linux/init.h>
	30	#include <linux/types.h>
	31	#include <acpi/acpi_bus.h>
	32	#include <acpi/acpi_drivers.h>
	33
a192a958 LB	34	#include "internal.h"
a192a958 LB	35
1da177e4	36	#define _COMPONENT ACPI_BUS_COMPONENT
f52fd66d	37	ACPI_MODULE_NAME("utils");
1da177e4 LT	38
	39	/* --------------------------------------------------------------------------
	40	Object Evaluation Helpers
	41	-------------------------------------------------------------------------- */
4fd7f518 HH	42	static void
	43	acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
	44	{
1da177e4	45	#ifdef ACPI_DEBUG_OUTPUT
4fd7f518 HH	46	char prefix[80] = {'\0'};
	47	struct acpi_buffer buffer = {sizeof(prefix), prefix};
	48	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
	49	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
	50	(char *) prefix, p, acpi_format_exception(s)));
1da177e4	51	#else
4fd7f518	52	return;
1da177e4	53	#endif
4fd7f518 HH	54	}
4fd7f518 HH	55
1da177e4	56	acpi_status
4be44fcd LB	57	acpi_extract_package(union acpi_object *package,
4be44fcd LB	58	struct acpi_buffer format, struct acpi_buffer buffer)
1da177e4	59	{
4be44fcd LB	60	u32 size_required = 0;
	61	u32 tail_offset = 0;
	62	char *format_string = NULL;
	63	u32 format_count = 0;
	64	u32 i = 0;
	65	u8 *head = NULL;
	66	u8 *tail = NULL;
1da177e4	67
1da177e4	68
4be44fcd LB	69	if (!package \|\| (package->type != ACPI_TYPE_PACKAGE)
4be44fcd LB	70	\|\| (package->package.count < 1)) {
cece9296	71	printk(KERN_WARNING PREFIX "Invalid package argument\n");
d550d98d	72	return AE_BAD_PARAMETER;
1da177e4 LT	73	}
	74
	75	if (!format \|\| !format->pointer \|\| (format->length < 1)) {
cece9296	76	printk(KERN_WARNING PREFIX "Invalid format argument\n");
d550d98d	77	return AE_BAD_PARAMETER;
1da177e4 LT	78	}
	79
	80	if (!buffer) {
cece9296	81	printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
d550d98d	82	return AE_BAD_PARAMETER;
1da177e4 LT	83	}
1da177e4 LT	84
4be44fcd	85	format_count = (format->length / sizeof(char)) - 1;
1da177e4	86	if (format_count > package->package.count) {
cece9296 LB	87	printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
	88	" than exist in package [%d].\n",
	89	format_count, package->package.count);
d550d98d	90	return AE_BAD_DATA;
1da177e4 LT	91	}
1da177e4 LT	92
50dd0969	93	format_string = format->pointer;
1da177e4 LT	94
	95	/*
	96	* Calculate size_required.
	97	*/
4be44fcd	98	for (i = 0; i < format_count; i++) {
1da177e4 LT	99
	100	union acpi_object *element = &(package->package.elements[i]);
	101
	102	if (!element) {
d550d98d	103	return AE_BAD_DATA;
1da177e4 LT	104	}
	105
	106	switch (element->type) {
	107
	108	case ACPI_TYPE_INTEGER:
	109	switch (format_string[i]) {
	110	case 'N':
439913ff LM	111	size_required += sizeof(u64);
439913ff LM	112	tail_offset += sizeof(u64);
1da177e4 LT	113	break;
1da177e4 LT	114	case 'S':
4be44fcd	115	size_required +=
439913ff	116	sizeof(char *) + sizeof(u64) +
4be44fcd LB	117	sizeof(char);
4be44fcd LB	118	tail_offset += sizeof(char *);
1da177e4 LT	119	break;
1da177e4 LT	120	default:
cece9296	121	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	122	" [%d]: got number, expecing"
cece9296 LB	123	" [%c]\n",
cece9296 LB	124	i, format_string[i]);
d550d98d	125	return AE_BAD_DATA;
1da177e4 LT	126	break;
	127	}
	128	break;
	129
	130	case ACPI_TYPE_STRING:
	131	case ACPI_TYPE_BUFFER:
	132	switch (format_string[i]) {
	133	case 'S':
4be44fcd LB	134	size_required +=
	135	sizeof(char *) +
	136	(element->string.length * sizeof(char)) +
	137	sizeof(char);
	138	tail_offset += sizeof(char *);
1da177e4 LT	139	break;
1da177e4 LT	140	case 'B':
4be44fcd LB	141	size_required +=
	142	sizeof(u8 *) +
	143	(element->buffer.length * sizeof(u8));
	144	tail_offset += sizeof(u8 *);
1da177e4 LT	145	break;
1da177e4 LT	146	default:
cece9296	147	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	148	" [%d] got string/buffer,"
cece9296 LB	149	" expecing [%c]\n",
cece9296 LB	150	i, format_string[i]);
d550d98d	151	return AE_BAD_DATA;
1da177e4 LT	152	break;
	153	}
	154	break;
	155
	156	case ACPI_TYPE_PACKAGE:
	157	default:
4be44fcd LB	158	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	159	"Found unsupported element at index=%d\n",
	160	i));
1da177e4	161	/* TBD: handle nested packages... */
d550d98d	162	return AE_SUPPORT;
1da177e4 LT	163	break;
	164	}
	165	}
	166
	167	/*
	168	* Validate output buffer.
	169	*/
	170	if (buffer->length < size_required) {
	171	buffer->length = size_required;
d550d98d	172	return AE_BUFFER_OVERFLOW;
4be44fcd	173	} else if (buffer->length != size_required \|\| !buffer->pointer) {
d550d98d	174	return AE_BAD_PARAMETER;
1da177e4 LT	175	}
	176
	177	head = buffer->pointer;
	178	tail = buffer->pointer + tail_offset;
	179
	180	/*
	181	* Extract package data.
	182	*/
4be44fcd	183	for (i = 0; i < format_count; i++) {
1da177e4 LT	184
	185	u8 **pointer = NULL;
	186	union acpi_object *element = &(package->package.elements[i]);
	187
	188	if (!element) {
d550d98d	189	return AE_BAD_DATA;
1da177e4 LT	190	}
	191
	192	switch (element->type) {
	193
	194	case ACPI_TYPE_INTEGER:
	195	switch (format_string[i]) {
	196	case 'N':
439913ff	197	((u64 ) head) =
4be44fcd	198	element->integer.value;
439913ff	199	head += sizeof(u64);
1da177e4 LT	200	break;
1da177e4 LT	201	case 'S':
4be44fcd	202	pointer = (u8 **) head;
1da177e4	203	*pointer = tail;
439913ff	204	((u64 ) tail) =
4be44fcd	205	element->integer.value;
439913ff LM	206	head += sizeof(u64 *);
439913ff LM	207	tail += sizeof(u64);
1da177e4 LT	208	/* NULL terminate string */
	209	*tail = (char)0;
	210	tail += sizeof(char);
	211	break;
	212	default:
	213	/* Should never get here */
	214	break;
	215	}
	216	break;
	217
	218	case ACPI_TYPE_STRING:
	219	case ACPI_TYPE_BUFFER:
	220	switch (format_string[i]) {
	221	case 'S':
4be44fcd	222	pointer = (u8 **) head;
1da177e4	223	*pointer = tail;
4be44fcd LB	224	memcpy(tail, element->string.pointer,
	225	element->string.length);
	226	head += sizeof(char *);
1da177e4 LT	227	tail += element->string.length * sizeof(char);
	228	/* NULL terminate string */
	229	*tail = (char)0;
	230	tail += sizeof(char);
	231	break;
	232	case 'B':
4be44fcd	233	pointer = (u8 **) head;
1da177e4	234	*pointer = tail;
4be44fcd LB	235	memcpy(tail, element->buffer.pointer,
	236	element->buffer.length);
	237	head += sizeof(u8 *);
1da177e4 LT	238	tail += element->buffer.length * sizeof(u8);
	239	break;
	240	default:
	241	/* Should never get here */
	242	break;
	243	}
	244	break;
	245
	246	case ACPI_TYPE_PACKAGE:
	247	/* TBD: handle nested packages... */
	248	default:
	249	/* Should never get here */
	250	break;
	251	}
	252	}
	253
d550d98d	254	return AE_OK;
1da177e4	255	}
1da177e4	256
4be44fcd	257	EXPORT_SYMBOL(acpi_extract_package);
1da177e4 LT	258
1da177e4 LT	259	acpi_status
4be44fcd LB	260	acpi_evaluate_integer(acpi_handle handle,
4be44fcd LB	261	acpi_string pathname,
27663c58	262	struct acpi_object_list arguments, unsigned long long data)
1da177e4	263	{
4be44fcd	264	acpi_status status = AE_OK;
40599072	265	union acpi_object element;
4be44fcd	266	struct acpi_buffer buffer = { 0, NULL };
1da177e4	267
1da177e4	268	if (!data)
d550d98d	269	return AE_BAD_PARAMETER;
1da177e4	270
1da177e4	271	buffer.length = sizeof(union acpi_object);
40599072	272	buffer.pointer = &element;
1da177e4 LT	273	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	274	if (ACPI_FAILURE(status)) {
	275	acpi_util_eval_error(handle, pathname, status);
d550d98d	276	return status;
1da177e4 LT	277	}
1da177e4 LT	278
40599072	279	if (element.type != ACPI_TYPE_INTEGER) {
1da177e4	280	acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
d550d98d	281	return AE_BAD_DATA;
1da177e4 LT	282	}
1da177e4 LT	283
40599072	284	*data = element.integer.value;
1da177e4	285
27663c58	286	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
1da177e4	287
d550d98d	288	return AE_OK;
1da177e4	289	}
1da177e4	290
4be44fcd	291	EXPORT_SYMBOL(acpi_evaluate_integer);
1da177e4	292
1da177e4	293	acpi_status
4be44fcd LB	294	acpi_evaluate_reference(acpi_handle handle,
	295	acpi_string pathname,
	296	struct acpi_object_list *arguments,
	297	struct acpi_handle_list *list)
1da177e4	298	{
4be44fcd LB	299	acpi_status status = AE_OK;
	300	union acpi_object *package = NULL;
	301	union acpi_object *element = NULL;
	302	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	303	u32 i = 0;
1da177e4	304
1da177e4 LT	305
1da177e4 LT	306	if (!list) {
d550d98d	307	return AE_BAD_PARAMETER;
1da177e4 LT	308	}
	309
	310	/* Evaluate object. */
	311
	312	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	313	if (ACPI_FAILURE(status))
	314	goto end;
	315
50dd0969	316	package = buffer.pointer;
1da177e4 LT	317
1da177e4 LT	318	if ((buffer.length == 0) \|\| !package) {
6468463a LB	319	printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
6468463a LB	320	(unsigned)buffer.length, package);
1da177e4 LT	321	status = AE_BAD_DATA;
	322	acpi_util_eval_error(handle, pathname, status);
	323	goto end;
	324	}
	325	if (package->type != ACPI_TYPE_PACKAGE) {
6468463a LB	326	printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
6468463a LB	327	package->type);
1da177e4 LT	328	status = AE_BAD_DATA;
	329	acpi_util_eval_error(handle, pathname, status);
	330	goto end;
	331	}
	332	if (!package->package.count) {
6468463a LB	333	printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
6468463a LB	334	package);
1da177e4 LT	335	status = AE_BAD_DATA;
	336	acpi_util_eval_error(handle, pathname, status);
	337	goto end;
	338	}
	339
	340	if (package->package.count > ACPI_MAX_HANDLES) {
d550d98d	341	return AE_NO_MEMORY;
1da177e4 LT	342	}
	343	list->count = package->package.count;
	344
	345	/* Extract package data. */
	346
	347	for (i = 0; i < list->count; i++) {
	348
	349	element = &(package->package.elements[i]);
	350
cd0b2248	351	if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
1da177e4	352	status = AE_BAD_DATA;
6468463a LB	353	printk(KERN_ERR PREFIX
	354	"Expecting a [Reference] package element, found type %X\n",
	355	element->type);
1da177e4 LT	356	acpi_util_eval_error(handle, pathname, status);
	357	break;
	358	}
	359
b6a16387 TR	360	if (!element->reference.handle) {
	361	printk(KERN_WARNING PREFIX "Invalid reference in"
	362	" package %s\n", pathname);
	363	status = AE_NULL_ENTRY;
	364	break;
	365	}
1da177e4 LT	366	/* Get the acpi_handle. */
	367
	368	list->handles[i] = element->reference.handle;
	369	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
4be44fcd	370	list->handles[i]));
1da177e4 LT	371	}
1da177e4 LT	372
4be44fcd	373	end:
1da177e4 LT	374	if (ACPI_FAILURE(status)) {
	375	list->count = 0;
	376	//kfree(list->handles);
	377	}
	378
02438d87	379	kfree(buffer.pointer);
1da177e4	380
d550d98d	381	return status;
1da177e4	382	}
1da177e4	383
4be44fcd	384	EXPORT_SYMBOL(acpi_evaluate_reference);