[net-next-2.6.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>

#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(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 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);

#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_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 <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
a192a958 LB	33	#include "internal.h"
a192a958 LB	34
1da177e4	35	#define _COMPONENT ACPI_BUS_COMPONENT
f52fd66d	36	ACPI_MODULE_NAME("utils");
1da177e4 LT	37
	38	/* --------------------------------------------------------------------------
	39	Object Evaluation Helpers
	40	-------------------------------------------------------------------------- */
4fd7f518 HH	41	static void
	42	acpi_util_eval_error(acpi_handle h, acpi_string p, acpi_status s)
	43	{
1da177e4	44	#ifdef ACPI_DEBUG_OUTPUT
4fd7f518 HH	45	char prefix[80] = {'\0'};
	46	struct acpi_buffer buffer = {sizeof(prefix), prefix};
	47	acpi_get_name(h, ACPI_FULL_PATHNAME, &buffer);
	48	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluate [%s.%s]: %s\n",
	49	(char *) prefix, p, acpi_format_exception(s)));
1da177e4	50	#else
4fd7f518	51	return;
1da177e4	52	#endif
4fd7f518 HH	53	}
4fd7f518 HH	54
1da177e4	55	acpi_status
4be44fcd LB	56	acpi_extract_package(union acpi_object *package,
4be44fcd LB	57	struct acpi_buffer format, struct acpi_buffer buffer)
1da177e4	58	{
4be44fcd LB	59	u32 size_required = 0;
	60	u32 tail_offset = 0;
	61	char *format_string = NULL;
	62	u32 format_count = 0;
	63	u32 i = 0;
	64	u8 *head = NULL;
	65	u8 *tail = NULL;
1da177e4	66
1da177e4	67
4be44fcd LB	68	if (!package \|\| (package->type != ACPI_TYPE_PACKAGE)
4be44fcd LB	69	\|\| (package->package.count < 1)) {
cece9296	70	printk(KERN_WARNING PREFIX "Invalid package argument\n");
d550d98d	71	return AE_BAD_PARAMETER;
1da177e4 LT	72	}
	73
	74	if (!format \|\| !format->pointer \|\| (format->length < 1)) {
cece9296	75	printk(KERN_WARNING PREFIX "Invalid format argument\n");
d550d98d	76	return AE_BAD_PARAMETER;
1da177e4 LT	77	}
	78
	79	if (!buffer) {
cece9296	80	printk(KERN_WARNING PREFIX "Invalid buffer argument\n");
d550d98d	81	return AE_BAD_PARAMETER;
1da177e4 LT	82	}
1da177e4 LT	83
4be44fcd	84	format_count = (format->length / sizeof(char)) - 1;
1da177e4	85	if (format_count > package->package.count) {
cece9296 LB	86	printk(KERN_WARNING PREFIX "Format specifies more objects [%d]"
	87	" than exist in package [%d].\n",
	88	format_count, package->package.count);
d550d98d	89	return AE_BAD_DATA;
1da177e4 LT	90	}
1da177e4 LT	91
50dd0969	92	format_string = format->pointer;
1da177e4 LT	93
	94	/*
	95	* Calculate size_required.
	96	*/
4be44fcd	97	for (i = 0; i < format_count; i++) {
1da177e4 LT	98
	99	union acpi_object *element = &(package->package.elements[i]);
	100
	101	if (!element) {
d550d98d	102	return AE_BAD_DATA;
1da177e4 LT	103	}
	104
	105	switch (element->type) {
	106
	107	case ACPI_TYPE_INTEGER:
	108	switch (format_string[i]) {
	109	case 'N':
	110	size_required += sizeof(acpi_integer);
	111	tail_offset += sizeof(acpi_integer);
	112	break;
	113	case 'S':
4be44fcd LB	114	size_required +=
	115	sizeof(char *) + sizeof(acpi_integer) +
	116	sizeof(char);
	117	tail_offset += sizeof(char *);
1da177e4 LT	118	break;
1da177e4 LT	119	default:
cece9296	120	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	121	" [%d]: got number, expecing"
cece9296 LB	122	" [%c]\n",
cece9296 LB	123	i, format_string[i]);
d550d98d	124	return AE_BAD_DATA;
1da177e4 LT	125	break;
	126	}
	127	break;
	128
	129	case ACPI_TYPE_STRING:
	130	case ACPI_TYPE_BUFFER:
	131	switch (format_string[i]) {
	132	case 'S':
4be44fcd LB	133	size_required +=
	134	sizeof(char *) +
	135	(element->string.length * sizeof(char)) +
	136	sizeof(char);
	137	tail_offset += sizeof(char *);
1da177e4 LT	138	break;
1da177e4 LT	139	case 'B':
4be44fcd LB	140	size_required +=
	141	sizeof(u8 *) +
	142	(element->buffer.length * sizeof(u8));
	143	tail_offset += sizeof(u8 *);
1da177e4 LT	144	break;
1da177e4 LT	145	default:
cece9296	146	printk(KERN_WARNING PREFIX "Invalid package element"
a6fc6720	147	" [%d] got string/buffer,"
cece9296 LB	148	" expecing [%c]\n",
cece9296 LB	149	i, format_string[i]);
d550d98d	150	return AE_BAD_DATA;
1da177e4 LT	151	break;
	152	}
	153	break;
	154
	155	case ACPI_TYPE_PACKAGE:
	156	default:
4be44fcd LB	157	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	158	"Found unsupported element at index=%d\n",
	159	i));
1da177e4	160	/* TBD: handle nested packages... */
d550d98d	161	return AE_SUPPORT;
1da177e4 LT	162	break;
	163	}
	164	}
	165
	166	/*
	167	* Validate output buffer.
	168	*/
	169	if (buffer->length < size_required) {
	170	buffer->length = size_required;
d550d98d	171	return AE_BUFFER_OVERFLOW;
4be44fcd	172	} else if (buffer->length != size_required \|\| !buffer->pointer) {
d550d98d	173	return AE_BAD_PARAMETER;
1da177e4 LT	174	}
	175
	176	head = buffer->pointer;
	177	tail = buffer->pointer + tail_offset;
	178
	179	/*
	180	* Extract package data.
	181	*/
4be44fcd	182	for (i = 0; i < format_count; i++) {
1da177e4 LT	183
	184	u8 **pointer = NULL;
	185	union acpi_object *element = &(package->package.elements[i]);
	186
	187	if (!element) {
d550d98d	188	return AE_BAD_DATA;
1da177e4 LT	189	}
	190
	191	switch (element->type) {
	192
	193	case ACPI_TYPE_INTEGER:
	194	switch (format_string[i]) {
	195	case 'N':
4be44fcd LB	196	((acpi_integer ) head) =
4be44fcd LB	197	element->integer.value;
1da177e4 LT	198	head += sizeof(acpi_integer);
	199	break;
	200	case 'S':
4be44fcd	201	pointer = (u8 **) head;
1da177e4	202	*pointer = tail;
4be44fcd LB	203	((acpi_integer ) tail) =
	204	element->integer.value;
	205	head += sizeof(acpi_integer *);
1da177e4 LT	206	tail += sizeof(acpi_integer);
	207	/* NULL terminate string */
	208	*tail = (char)0;
	209	tail += sizeof(char);
	210	break;
	211	default:
	212	/* Should never get here */
	213	break;
	214	}
	215	break;
	216
	217	case ACPI_TYPE_STRING:
	218	case ACPI_TYPE_BUFFER:
	219	switch (format_string[i]) {
	220	case 'S':
4be44fcd	221	pointer = (u8 **) head;
1da177e4	222	*pointer = tail;
4be44fcd LB	223	memcpy(tail, element->string.pointer,
	224	element->string.length);
	225	head += sizeof(char *);
1da177e4 LT	226	tail += element->string.length * sizeof(char);
	227	/* NULL terminate string */
	228	*tail = (char)0;
	229	tail += sizeof(char);
	230	break;
	231	case 'B':
4be44fcd	232	pointer = (u8 **) head;
1da177e4	233	*pointer = tail;
4be44fcd LB	234	memcpy(tail, element->buffer.pointer,
	235	element->buffer.length);
	236	head += sizeof(u8 *);
1da177e4 LT	237	tail += element->buffer.length * sizeof(u8);
	238	break;
	239	default:
	240	/* Should never get here */
	241	break;
	242	}
	243	break;
	244
	245	case ACPI_TYPE_PACKAGE:
	246	/* TBD: handle nested packages... */
	247	default:
	248	/* Should never get here */
	249	break;
	250	}
	251	}
	252
d550d98d	253	return AE_OK;
1da177e4	254	}
1da177e4	255
4be44fcd	256	EXPORT_SYMBOL(acpi_extract_package);
1da177e4 LT	257
1da177e4 LT	258	acpi_status
4be44fcd LB	259	acpi_evaluate_integer(acpi_handle handle,
4be44fcd LB	260	acpi_string pathname,
27663c58	261	struct acpi_object_list arguments, unsigned long long data)
1da177e4	262	{
4be44fcd	263	acpi_status status = AE_OK;
40599072	264	union acpi_object element;
4be44fcd	265	struct acpi_buffer buffer = { 0, NULL };
1da177e4	266
1da177e4	267	if (!data)
d550d98d	268	return AE_BAD_PARAMETER;
1da177e4	269
1da177e4	270	buffer.length = sizeof(union acpi_object);
40599072	271	buffer.pointer = &element;
1da177e4 LT	272	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	273	if (ACPI_FAILURE(status)) {
	274	acpi_util_eval_error(handle, pathname, status);
d550d98d	275	return status;
1da177e4 LT	276	}
1da177e4 LT	277
40599072	278	if (element.type != ACPI_TYPE_INTEGER) {
1da177e4	279	acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
d550d98d	280	return AE_BAD_DATA;
1da177e4 LT	281	}
1da177e4 LT	282
40599072	283	*data = element.integer.value;
1da177e4	284
27663c58	285	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%llu]\n", *data));
1da177e4	286
d550d98d	287	return AE_OK;
1da177e4	288	}
1da177e4	289
4be44fcd	290	EXPORT_SYMBOL(acpi_evaluate_integer);
1da177e4 LT	291
	292	#if 0
	293	acpi_status
4be44fcd LB	294	acpi_evaluate_string(acpi_handle handle,
	295	acpi_string pathname,
	296	acpi_object_list * arguments, acpi_string * data)
1da177e4	297	{
4be44fcd LB	298	acpi_status status = AE_OK;
	299	acpi_object *element = NULL;
	300	acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4	301
1da177e4 LT	302
1da177e4 LT	303	if (!data)
d550d98d	304	return AE_BAD_PARAMETER;
1da177e4 LT	305
	306	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	307	if (ACPI_FAILURE(status)) {
	308	acpi_util_eval_error(handle, pathname, status);
d550d98d	309	return status;
1da177e4 LT	310	}
	311
	312	element = (acpi_object *) buffer.pointer;
	313
4be44fcd LB	314	if ((element->type != ACPI_TYPE_STRING)
	315	\|\| (element->type != ACPI_TYPE_BUFFER)
	316	\|\| !element->string.length) {
1da177e4	317	acpi_util_eval_error(handle, pathname, AE_BAD_DATA);
d550d98d	318	return AE_BAD_DATA;
1da177e4 LT	319	}
1da177e4 LT	320
36bcbec7	321	*data = kzalloc(element->string.length + 1, GFP_KERNEL);
1da177e4	322	if (!data) {
6468463a	323	printk(KERN_ERR PREFIX "Memory allocation\n");
d550d98d	324	return -ENOMEM;
1da177e4	325	}
1da177e4 LT	326
	327	memcpy(*data, element->string.pointer, element->string.length);
	328
	329	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Return value [%s]\n", *data));
	330
02438d87	331	kfree(buffer.pointer);
1da177e4	332
d550d98d	333	return AE_OK;
1da177e4 LT	334	}
	335	#endif
	336
1da177e4	337	acpi_status
4be44fcd LB	338	acpi_evaluate_reference(acpi_handle handle,
	339	acpi_string pathname,
	340	struct acpi_object_list *arguments,
	341	struct acpi_handle_list *list)
1da177e4	342	{
4be44fcd LB	343	acpi_status status = AE_OK;
	344	union acpi_object *package = NULL;
	345	union acpi_object *element = NULL;
	346	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	347	u32 i = 0;
1da177e4	348
1da177e4 LT	349
1da177e4 LT	350	if (!list) {
d550d98d	351	return AE_BAD_PARAMETER;
1da177e4 LT	352	}
	353
	354	/* Evaluate object. */
	355
	356	status = acpi_evaluate_object(handle, pathname, arguments, &buffer);
	357	if (ACPI_FAILURE(status))
	358	goto end;
	359
50dd0969	360	package = buffer.pointer;
1da177e4 LT	361
1da177e4 LT	362	if ((buffer.length == 0) \|\| !package) {
6468463a LB	363	printk(KERN_ERR PREFIX "No return object (len %X ptr %p)\n",
6468463a LB	364	(unsigned)buffer.length, package);
1da177e4 LT	365	status = AE_BAD_DATA;
	366	acpi_util_eval_error(handle, pathname, status);
	367	goto end;
	368	}
	369	if (package->type != ACPI_TYPE_PACKAGE) {
6468463a LB	370	printk(KERN_ERR PREFIX "Expecting a [Package], found type %X\n",
6468463a LB	371	package->type);
1da177e4 LT	372	status = AE_BAD_DATA;
	373	acpi_util_eval_error(handle, pathname, status);
	374	goto end;
	375	}
	376	if (!package->package.count) {
6468463a LB	377	printk(KERN_ERR PREFIX "[Package] has zero elements (%p)\n",
6468463a LB	378	package);
1da177e4 LT	379	status = AE_BAD_DATA;
	380	acpi_util_eval_error(handle, pathname, status);
	381	goto end;
	382	}
	383
	384	if (package->package.count > ACPI_MAX_HANDLES) {
d550d98d	385	return AE_NO_MEMORY;
1da177e4 LT	386	}
	387	list->count = package->package.count;
	388
	389	/* Extract package data. */
	390
	391	for (i = 0; i < list->count; i++) {
	392
	393	element = &(package->package.elements[i]);
	394
cd0b2248	395	if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
1da177e4	396	status = AE_BAD_DATA;
6468463a LB	397	printk(KERN_ERR PREFIX
	398	"Expecting a [Reference] package element, found type %X\n",
	399	element->type);
1da177e4 LT	400	acpi_util_eval_error(handle, pathname, status);
	401	break;
	402	}
	403
b6a16387 TR	404	if (!element->reference.handle) {
	405	printk(KERN_WARNING PREFIX "Invalid reference in"
	406	" package %s\n", pathname);
	407	status = AE_NULL_ENTRY;
	408	break;
	409	}
1da177e4 LT	410	/* Get the acpi_handle. */
	411
	412	list->handles[i] = element->reference.handle;
	413	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found reference [%p]\n",
4be44fcd	414	list->handles[i]));
1da177e4 LT	415	}
1da177e4 LT	416
4be44fcd	417	end:
1da177e4 LT	418	if (ACPI_FAILURE(status)) {
	419	list->count = 0;
	420	//kfree(list->handles);
	421	}
	422
02438d87	423	kfree(buffer.pointer);
1da177e4	424
d550d98d	425	return status;
1da177e4	426	}
1da177e4	427
4be44fcd	428	EXPORT_SYMBOL(acpi_evaluate_reference);