[mirror_ubuntu-hirsute-kernel.git] / drivers / acpi / acpica / exfield.c

/******************************************************************************
 *
 * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2010, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_read_data_from_field
 *
 * PARAMETERS:  walk_state          - Current execution state
 *              obj_desc            - The named field
 *              ret_buffer_desc     - Where the return data object is stored
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read from a named field.  Returns either an Integer or a
 *              Buffer, depending on the size of the field.
 *
 ******************************************************************************/
acpi_status
acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
			     union acpi_operand_object *obj_desc,
			     union acpi_operand_object **ret_buffer_desc)
{
	acpi_status status;
	union acpi_operand_object *buffer_desc;
	acpi_size length;
	void *buffer;
	u32 function;

	ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);

	/* Parameter validation */

	if (!obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}
	if (!ret_buffer_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus or IPMI read. We must create a buffer to hold
		 * the data and then directly access the region handler.
		 *
		 * Note: Smbus protocol value is passed in upper 16-bits of Function
		 */
		if (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS) {
			length = ACPI_SMBUS_BUFFER_SIZE;
			function =
			    ACPI_READ | (obj_desc->field.attribute << 16);
		} else {	/* IPMI */

			length = ACPI_IPMI_BUFFER_SIZE;
			function = ACPI_READ;
		}

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Lock entire transaction if requested */

		acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

		/* Call the region handler for the read */

		status = acpi_ex_access_region(obj_desc, 0,
					       ACPI_CAST_PTR(u64,
							     buffer_desc->
							     buffer.pointer),
					       function);
		acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
		goto exit;
	}

	/*
	 * Allocate a buffer for the contents of the field.
	 *
	 * If the field is larger than the current integer width, create
	 * a BUFFER to hold it.  Otherwise, use an INTEGER.  This allows
	 * the use of arithmetic operators on the returned value if the
	 * field size is equal or smaller than an Integer.
	 *
	 * Note: Field.length is in bits.
	 */
	length =
	    (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
	if (length > acpi_gbl_integer_byte_width) {

		/* Field is too large for an Integer, create a Buffer instead */

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
		buffer = buffer_desc->buffer.pointer;
	} else {
		/* Field will fit within an Integer (normal case) */

		buffer_desc = acpi_ut_create_integer_object((u64) 0);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		length = acpi_gbl_integer_byte_width;
		buffer = &buffer_desc->integer.value;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
			  obj_desc, obj_desc->common.type, buffer,
			  (u32) length));
	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Read from the field */

	status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

      exit:
	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(buffer_desc);
	} else {
		*ret_buffer_desc = buffer_desc;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_write_data_to_field
 *
 * PARAMETERS:  source_desc         - Contains data to write
 *              obj_desc            - The named field
 *              result_desc         - Where the return value is returned, if any
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write to a named field
 *
 ******************************************************************************/

acpi_status
acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
			    union acpi_operand_object *obj_desc,
			    union acpi_operand_object **result_desc)
{
	acpi_status status;
	u32 length;
	void *buffer;
	union acpi_operand_object *buffer_desc;
	u32 function;

	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);

	/* Parameter validation */

	if (!source_desc || !obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus or IPMI write. We will bypass the entire field
		 * mechanism and handoff the buffer directly to the handler. For
		 * these address spaces, the buffer is bi-directional; on a write,
		 * return data is returned in the same buffer.
		 *
		 * Source must be a buffer of sufficient size:
		 * ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
		 *
		 * Note: SMBus protocol type is passed in upper 16-bits of Function
		 */
		if (source_desc->common.type != ACPI_TYPE_BUFFER) {
			ACPI_ERROR((AE_INFO,
				    "SMBus or IPMI write requires Buffer, found type %s",
				    acpi_ut_get_object_type_name(source_desc)));

			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		if (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS) {
			length = ACPI_SMBUS_BUFFER_SIZE;
			function =
			    ACPI_WRITE | (obj_desc->field.attribute << 16);
		} else {	/* IPMI */

			length = ACPI_IPMI_BUFFER_SIZE;
			function = ACPI_WRITE;
		}

		if (source_desc->buffer.length < length) {
			ACPI_ERROR((AE_INFO,
				    "SMBus or IPMI write requires Buffer of length %u, found length %u",
				    length, source_desc->buffer.length));

			return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
		}

		/* Create the bi-directional buffer */

		buffer_desc = acpi_ut_create_buffer_object(length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		buffer = buffer_desc->buffer.pointer;
		ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);

		/* Lock entire transaction if requested */

		acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

		/*
		 * Perform the write (returns status and perhaps data in the
		 * same buffer)
		 */
		status = acpi_ex_access_region(obj_desc, 0,
					       (u64 *) buffer, function);
		acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

		*result_desc = buffer_desc;
		return_ACPI_STATUS(status);
	}

	/* Get a pointer to the data to be written */

	switch (source_desc->common.type) {
	case ACPI_TYPE_INTEGER:
		buffer = &source_desc->integer.value;
		length = sizeof(source_desc->integer.value);
		break;

	case ACPI_TYPE_BUFFER:
		buffer = source_desc->buffer.pointer;
		length = source_desc->buffer.length;
		break;

	case ACPI_TYPE_STRING:
		buffer = source_desc->string.pointer;
		length = source_desc->string.length;
		break;

	default:
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
			  source_desc,
			  acpi_ut_get_type_name(source_desc->common.type),
			  source_desc->common.type, buffer, length));

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc,
			  acpi_ut_get_type_name(obj_desc->common.type),
			  obj_desc->common.type,
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Write to the field */

	status = acpi_ex_insert_into_field(obj_desc, buffer, length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

	return_ACPI_STATUS(status);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: exfield - ACPI AML (p-code) execution - field manipulation
	4	*
	5	*****************************************************************************/
	6
	7	/*
a8357b0c	8	* Copyright (C) 2000 - 2010, Intel Corp.
1da177e4 LT	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
1da177e4	44	#include <acpi/acpi.h>
e2f7a777 LB	45	#include "accommon.h"
	46	#include "acdispat.h"
	47	#include "acinterp.h"
1da177e4	48
1da177e4	49	#define _COMPONENT ACPI_EXECUTER
4be44fcd	50	ACPI_MODULE_NAME("exfield")
1da177e4 LT	51
	52	/*******************************************************************************
	53	*
	54	* FUNCTION: acpi_ex_read_data_from_field
	55	*
	56	* PARAMETERS: walk_state - Current execution state
	57	* obj_desc - The named field
	58	* ret_buffer_desc - Where the return data object is stored
	59	*
	60	* RETURN: Status
	61	*
	62	* DESCRIPTION: Read from a named field. Returns either an Integer or a
	63	* Buffer, depending on the size of the field.
	64	*
	65	******************************************************************************/
1da177e4	66	acpi_status
4be44fcd LB	67	acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
	68	union acpi_operand_object *obj_desc,
	69	union acpi_operand_object **ret_buffer_desc)
1da177e4	70	{
4be44fcd LB	71	acpi_status status;
	72	union acpi_operand_object *buffer_desc;
	73	acpi_size length;
	74	void *buffer;
6557a49a	75	u32 function;
1da177e4	76
b229cf92	77	ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);
1da177e4 LT	78
	79	/* Parameter validation */
	80
	81	if (!obj_desc) {
4be44fcd	82	return_ACPI_STATUS(AE_AML_NO_OPERAND);
1da177e4	83	}
88ac00f5	84	if (!ret_buffer_desc) {
4be44fcd	85	return_ACPI_STATUS(AE_BAD_PARAMETER);
88ac00f5	86	}
1da177e4	87
3371c19c	88	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
1da177e4 LT	89	/*
	90	* If the buffer_field arguments have not been previously evaluated,
	91	* evaluate them now and save the results.
	92	*/
	93	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
4be44fcd LB	94	status = acpi_ds_get_buffer_field_arguments(obj_desc);
	95	if (ACPI_FAILURE(status)) {
	96	return_ACPI_STATUS(status);
1da177e4 LT	97	}
1da177e4 LT	98	}
3371c19c BM	99	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
3371c19c BM	100	(obj_desc->field.region_obj->region.space_id ==
6557a49a LM	101	ACPI_ADR_SPACE_SMBUS
	102	\|\| obj_desc->field.region_obj->region.space_id ==
	103	ACPI_ADR_SPACE_IPMI)) {
1da177e4	104	/*
6557a49a LM	105	* This is an SMBus or IPMI read. We must create a buffer to hold
	106	* the data and then directly access the region handler.
	107	*
	108	* Note: Smbus protocol value is passed in upper 16-bits of Function
1da177e4	109	*/
6557a49a LM	110	if (obj_desc->field.region_obj->region.space_id ==
	111	ACPI_ADR_SPACE_SMBUS) {
	112	length = ACPI_SMBUS_BUFFER_SIZE;
	113	function =
	114	ACPI_READ \| (obj_desc->field.attribute << 16);
	115	} else { /* IPMI */
	116
	117	length = ACPI_IPMI_BUFFER_SIZE;
	118	function = ACPI_READ;
	119	}
	120
	121	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	122	if (!buffer_desc) {
4be44fcd	123	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	124	}
	125
	126	/* Lock entire transaction if requested */
	127
ba886cd4	128	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4	129
6557a49a LM	130	/* Call the region handler for the read */
6557a49a LM	131
4be44fcd	132	status = acpi_ex_access_region(obj_desc, 0,
5df7e6cb	133	ACPI_CAST_PTR(u64,
4be44fcd LB	134	buffer_desc->
4be44fcd LB	135	buffer.pointer),
6557a49a	136	function);
f02e9fa1	137	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	138	goto exit;
	139	}
	140
	141	/*
	142	* Allocate a buffer for the contents of the field.
	143	*
5df7e6cb	144	* If the field is larger than the current integer width, create
1da177e4 LT	145	* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
	146	* the use of arithmetic operators on the returned value if the
	147	* field size is equal or smaller than an Integer.
	148	*
	149	* Note: Field.length is in bits.
	150	*/
4be44fcd LB	151	length =
4be44fcd LB	152	(acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
1da177e4	153	if (length > acpi_gbl_integer_byte_width) {
52fc0b02	154
1da177e4 LT	155	/* Field is too large for an Integer, create a Buffer instead */
1da177e4 LT	156
4be44fcd	157	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	158	if (!buffer_desc) {
4be44fcd	159	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	160	}
1da177e4 LT	161	buffer = buffer_desc->buffer.pointer;
4be44fcd	162	} else {
1da177e4 LT	163	/* Field will fit within an Integer (normal case) */
1da177e4 LT	164
dc95a270	165	buffer_desc = acpi_ut_create_integer_object((u64) 0);
1da177e4	166	if (!buffer_desc) {
4be44fcd	167	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	168	}
	169
	170	length = acpi_gbl_integer_byte_width;
1da177e4 LT	171	buffer = &buffer_desc->integer.value;
	172	}
	173
4be44fcd	174	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	175	"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
3371c19c	176	obj_desc, obj_desc->common.type, buffer,
4be44fcd LB	177	(u32) length));
4be44fcd LB	178	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	179	"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
4be44fcd LB	180	obj_desc->common_field.bit_length,
	181	obj_desc->common_field.start_field_bit_offset,
	182	obj_desc->common_field.base_byte_offset));
1da177e4 LT	183
	184	/* Lock entire transaction if requested */
	185
ba886cd4	186	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	187
	188	/* Read from the field */
	189
4be44fcd	190	status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
f02e9fa1	191	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4	192
4be44fcd LB	193	exit:
	194	if (ACPI_FAILURE(status)) {
	195	acpi_ut_remove_reference(buffer_desc);
	196	} else {
1da177e4 LT	197	*ret_buffer_desc = buffer_desc;
	198	}
	199
4be44fcd	200	return_ACPI_STATUS(status);
1da177e4 LT	201	}
1da177e4 LT	202
1da177e4 LT	203	/*******************************************************************************
	204	*
	205	* FUNCTION: acpi_ex_write_data_to_field
	206	*
	207	* PARAMETERS: source_desc - Contains data to write
	208	* obj_desc - The named field
44f6c012	209	* result_desc - Where the return value is returned, if any
1da177e4 LT	210	*
	211	* RETURN: Status
	212	*
	213	* DESCRIPTION: Write to a named field
	214	*
	215	******************************************************************************/
	216
	217	acpi_status
4be44fcd LB	218	acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
	219	union acpi_operand_object *obj_desc,
	220	union acpi_operand_object **result_desc)
1da177e4	221	{
4be44fcd LB	222	acpi_status status;
4be44fcd LB	223	u32 length;
4be44fcd	224	void *buffer;
4be44fcd	225	union acpi_operand_object *buffer_desc;
6557a49a	226	u32 function;
1da177e4	227
b229cf92	228	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
1da177e4 LT	229
	230	/* Parameter validation */
	231
	232	if (!source_desc \|\| !obj_desc) {
4be44fcd	233	return_ACPI_STATUS(AE_AML_NO_OPERAND);
1da177e4 LT	234	}
1da177e4 LT	235
3371c19c	236	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
1da177e4 LT	237	/*
	238	* If the buffer_field arguments have not been previously evaluated,
	239	* evaluate them now and save the results.
	240	*/
	241	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
4be44fcd LB	242	status = acpi_ds_get_buffer_field_arguments(obj_desc);
	243	if (ACPI_FAILURE(status)) {
	244	return_ACPI_STATUS(status);
1da177e4 LT	245	}
1da177e4 LT	246	}
3371c19c BM	247	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
3371c19c BM	248	(obj_desc->field.region_obj->region.space_id ==
6557a49a LM	249	ACPI_ADR_SPACE_SMBUS
	250	\|\| obj_desc->field.region_obj->region.space_id ==
	251	ACPI_ADR_SPACE_IPMI)) {
1da177e4	252	/*
6557a49a LM	253	* This is an SMBus or IPMI write. We will bypass the entire field
	254	* mechanism and handoff the buffer directly to the handler. For
	255	* these address spaces, the buffer is bi-directional; on a write,
	256	* return data is returned in the same buffer.
	257	*
	258	* Source must be a buffer of sufficient size:
	259	* ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE.
1da177e4	260	*
6557a49a	261	* Note: SMBus protocol type is passed in upper 16-bits of Function
1da177e4	262	*/
3371c19c	263	if (source_desc->common.type != ACPI_TYPE_BUFFER) {
b8e4d893	264	ACPI_ERROR((AE_INFO,
6557a49a	265	"SMBus or IPMI write requires Buffer, found type %s",
b8e4d893	266	acpi_ut_get_object_type_name(source_desc)));
44f6c012	267
4be44fcd	268	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	269	}
1da177e4 LT	270
6557a49a LM	271	if (obj_desc->field.region_obj->region.space_id ==
	272	ACPI_ADR_SPACE_SMBUS) {
	273	length = ACPI_SMBUS_BUFFER_SIZE;
	274	function =
	275	ACPI_WRITE \| (obj_desc->field.attribute << 16);
	276	} else { /* IPMI */
	277
	278	length = ACPI_IPMI_BUFFER_SIZE;
	279	function = ACPI_WRITE;
	280	}
	281
	282	if (source_desc->buffer.length < length) {
b8e4d893	283	ACPI_ERROR((AE_INFO,
f6a22b0b	284	"SMBus or IPMI write requires Buffer of length %u, found length %u",
6557a49a	285	length, source_desc->buffer.length));
44f6c012	286
4be44fcd	287	return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
1da177e4 LT	288	}
1da177e4 LT	289
6557a49a LM	290	/* Create the bi-directional buffer */
	291
	292	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	293	if (!buffer_desc) {
4be44fcd	294	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	295	}
	296
	297	buffer = buffer_desc->buffer.pointer;
6557a49a	298	ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
1da177e4 LT	299
	300	/* Lock entire transaction if requested */
	301
ba886cd4	302	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	303
1da177e4 LT	304	/*
44f6c012 RM	305	* Perform the write (returns status and perhaps data in the
44f6c012 RM	306	* same buffer)
1da177e4	307	*/
4be44fcd	308	status = acpi_ex_access_region(obj_desc, 0,
5df7e6cb	309	(u64 *) buffer, function);
f02e9fa1	310	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	311
1da177e4 LT	312	*result_desc = buffer_desc;
4be44fcd	313	return_ACPI_STATUS(status);
1da177e4 LT	314	}
1da177e4 LT	315
44f6c012 RM	316	/* Get a pointer to the data to be written */
44f6c012 RM	317
3371c19c	318	switch (source_desc->common.type) {
1da177e4 LT	319	case ACPI_TYPE_INTEGER:
1da177e4 LT	320	buffer = &source_desc->integer.value;
4be44fcd	321	length = sizeof(source_desc->integer.value);
1da177e4 LT	322	break;
	323
	324	case ACPI_TYPE_BUFFER:
	325	buffer = source_desc->buffer.pointer;
	326	length = source_desc->buffer.length;
	327	break;
	328
	329	case ACPI_TYPE_STRING:
	330	buffer = source_desc->string.pointer;
	331	length = source_desc->string.length;
	332	break;
	333
	334	default:
4be44fcd	335	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	336	}
1da177e4 LT	337
4be44fcd	338	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	339	"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
4be44fcd	340	source_desc,
3371c19c BM	341	acpi_ut_get_type_name(source_desc->common.type),
3371c19c BM	342	source_desc->common.type, buffer, length));
4be44fcd LB	343
4be44fcd LB	344	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	345	"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
4be44fcd	346	obj_desc,
3371c19c BM	347	acpi_ut_get_type_name(obj_desc->common.type),
3371c19c BM	348	obj_desc->common.type,
4be44fcd LB	349	obj_desc->common_field.bit_length,
	350	obj_desc->common_field.start_field_bit_offset,
	351	obj_desc->common_field.base_byte_offset));
1da177e4 LT	352
	353	/* Lock entire transaction if requested */
	354
ba886cd4	355	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	356
	357	/* Write to the field */
	358
4be44fcd	359	status = acpi_ex_insert_into_field(obj_desc, buffer, length);
f02e9fa1	360	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4	361
4be44fcd	362	return_ACPI_STATUS(status);
1da177e4	363	}