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