[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / exfield.c

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

/*
 * Copyright (C) 2000 - 2012, 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_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
		 * the data and then directly access the region handler.
		 *
		 * Note: SMBus and GSBus 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 if (obj_desc->field.region_obj->region.space_id ==
			   ACPI_ADR_SPACE_GSBUS) {
			length = ACPI_GSBUS_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_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI)) {
		/*
		 * This is an SMBus, GSBus 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, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
		 *
		 * Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
		 */
		if (source_desc->common.type != ACPI_TYPE_BUFFER) {
			ACPI_ERROR((AE_INFO,
				    "SMBus/IPMI/GenericSerialBus 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 if (obj_desc->field.region_obj->region.space_id ==
			   ACPI_ADR_SPACE_GSBUS) {
			length = ACPI_GSBUS_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/IPMI/GenericSerialBus 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	/*
77848130	8	* Copyright (C) 2000 - 2012, 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
6557a49a LM	102	\|\| obj_desc->field.region_obj->region.space_id ==
2da120b6 BM	103	ACPI_ADR_SPACE_GSBUS
2da120b6 BM	104	\|\| obj_desc->field.region_obj->region.space_id ==
6557a49a	105	ACPI_ADR_SPACE_IPMI)) {
1da177e4	106	/*
2da120b6	107	* This is an SMBus, GSBus or IPMI read. We must create a buffer to hold
6557a49a LM	108	* the data and then directly access the region handler.
6557a49a LM	109	*
2da120b6	110	* Note: SMBus and GSBus protocol value is passed in upper 16-bits of Function
1da177e4	111	*/
6557a49a LM	112	if (obj_desc->field.region_obj->region.space_id ==
	113	ACPI_ADR_SPACE_SMBUS) {
	114	length = ACPI_SMBUS_BUFFER_SIZE;
	115	function =
	116	ACPI_READ \| (obj_desc->field.attribute << 16);
2da120b6 BM	117	} else if (obj_desc->field.region_obj->region.space_id ==
	118	ACPI_ADR_SPACE_GSBUS) {
	119	length = ACPI_GSBUS_BUFFER_SIZE;
	120	function =
	121	ACPI_READ \| (obj_desc->field.attribute << 16);
6557a49a LM	122	} else { /* IPMI */
	123
	124	length = ACPI_IPMI_BUFFER_SIZE;
	125	function = ACPI_READ;
	126	}
	127
	128	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	129	if (!buffer_desc) {
4be44fcd	130	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	131	}
	132
	133	/* Lock entire transaction if requested */
	134
ba886cd4	135	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4	136
6557a49a LM	137	/* Call the region handler for the read */
6557a49a LM	138
4be44fcd	139	status = acpi_ex_access_region(obj_desc, 0,
5df7e6cb	140	ACPI_CAST_PTR(u64,
4be44fcd LB	141	buffer_desc->
4be44fcd LB	142	buffer.pointer),
6557a49a	143	function);
f02e9fa1	144	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	145	goto exit;
	146	}
	147
	148	/*
	149	* Allocate a buffer for the contents of the field.
	150	*
5df7e6cb	151	* If the field is larger than the current integer width, create
1da177e4 LT	152	* a BUFFER to hold it. Otherwise, use an INTEGER. This allows
	153	* the use of arithmetic operators on the returned value if the
	154	* field size is equal or smaller than an Integer.
	155	*
	156	* Note: Field.length is in bits.
	157	*/
4be44fcd LB	158	length =
4be44fcd LB	159	(acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);
1da177e4	160	if (length > acpi_gbl_integer_byte_width) {
52fc0b02	161
1da177e4 LT	162	/* Field is too large for an Integer, create a Buffer instead */
1da177e4 LT	163
4be44fcd	164	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	165	if (!buffer_desc) {
4be44fcd	166	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	167	}
1da177e4 LT	168	buffer = buffer_desc->buffer.pointer;
4be44fcd	169	} else {
1da177e4 LT	170	/* Field will fit within an Integer (normal case) */
1da177e4 LT	171
dc95a270	172	buffer_desc = acpi_ut_create_integer_object((u64) 0);
1da177e4	173	if (!buffer_desc) {
4be44fcd	174	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	175	}
	176
	177	length = acpi_gbl_integer_byte_width;
1da177e4 LT	178	buffer = &buffer_desc->integer.value;
	179	}
	180
4be44fcd	181	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	182	"FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n",
3371c19c	183	obj_desc, obj_desc->common.type, buffer,
4be44fcd LB	184	(u32) length));
4be44fcd LB	185	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	186	"FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
4be44fcd LB	187	obj_desc->common_field.bit_length,
	188	obj_desc->common_field.start_field_bit_offset,
	189	obj_desc->common_field.base_byte_offset));
1da177e4 LT	190
	191	/* Lock entire transaction if requested */
	192
ba886cd4	193	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	194
	195	/* Read from the field */
	196
4be44fcd	197	status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length);
f02e9fa1	198	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4	199
4be44fcd LB	200	exit:
	201	if (ACPI_FAILURE(status)) {
	202	acpi_ut_remove_reference(buffer_desc);
	203	} else {
1da177e4 LT	204	*ret_buffer_desc = buffer_desc;
	205	}
	206
4be44fcd	207	return_ACPI_STATUS(status);
1da177e4 LT	208	}
1da177e4 LT	209
1da177e4 LT	210	/*******************************************************************************
	211	*
	212	* FUNCTION: acpi_ex_write_data_to_field
	213	*
	214	* PARAMETERS: source_desc - Contains data to write
	215	* obj_desc - The named field
44f6c012	216	* result_desc - Where the return value is returned, if any
1da177e4 LT	217	*
	218	* RETURN: Status
	219	*
	220	* DESCRIPTION: Write to a named field
	221	*
	222	******************************************************************************/
	223
	224	acpi_status
4be44fcd LB	225	acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
	226	union acpi_operand_object *obj_desc,
	227	union acpi_operand_object **result_desc)
1da177e4	228	{
4be44fcd LB	229	acpi_status status;
4be44fcd LB	230	u32 length;
4be44fcd	231	void *buffer;
4be44fcd	232	union acpi_operand_object *buffer_desc;
6557a49a	233	u32 function;
1da177e4	234
b229cf92	235	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);
1da177e4 LT	236
	237	/* Parameter validation */
	238
	239	if (!source_desc \|\| !obj_desc) {
4be44fcd	240	return_ACPI_STATUS(AE_AML_NO_OPERAND);
1da177e4 LT	241	}
1da177e4 LT	242
3371c19c	243	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
1da177e4 LT	244	/*
	245	* If the buffer_field arguments have not been previously evaluated,
	246	* evaluate them now and save the results.
	247	*/
	248	if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
4be44fcd LB	249	status = acpi_ds_get_buffer_field_arguments(obj_desc);
	250	if (ACPI_FAILURE(status)) {
	251	return_ACPI_STATUS(status);
1da177e4 LT	252	}
1da177e4 LT	253	}
3371c19c BM	254	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
3371c19c BM	255	(obj_desc->field.region_obj->region.space_id ==
6557a49a LM	256	ACPI_ADR_SPACE_SMBUS
6557a49a LM	257	\|\| obj_desc->field.region_obj->region.space_id ==
2da120b6 BM	258	ACPI_ADR_SPACE_GSBUS
2da120b6 BM	259	\|\| obj_desc->field.region_obj->region.space_id ==
6557a49a	260	ACPI_ADR_SPACE_IPMI)) {
1da177e4	261	/*
2da120b6	262	* This is an SMBus, GSBus or IPMI write. We will bypass the entire field
6557a49a LM	263	* mechanism and handoff the buffer directly to the handler. For
	264	* these address spaces, the buffer is bi-directional; on a write,
	265	* return data is returned in the same buffer.
	266	*
	267	* Source must be a buffer of sufficient size:
2da120b6	268	* ACPI_SMBUS_BUFFER_SIZE, ACPI_GSBUS_BUFFER_SIZE, or ACPI_IPMI_BUFFER_SIZE.
1da177e4	269	*
2da120b6	270	* Note: SMBus and GSBus protocol type is passed in upper 16-bits of Function
1da177e4	271	*/
3371c19c	272	if (source_desc->common.type != ACPI_TYPE_BUFFER) {
b8e4d893	273	ACPI_ERROR((AE_INFO,
2da120b6	274	"SMBus/IPMI/GenericSerialBus write requires Buffer, found type %s",
b8e4d893	275	acpi_ut_get_object_type_name(source_desc)));
44f6c012	276
4be44fcd	277	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	278	}
1da177e4 LT	279
6557a49a LM	280	if (obj_desc->field.region_obj->region.space_id ==
	281	ACPI_ADR_SPACE_SMBUS) {
	282	length = ACPI_SMBUS_BUFFER_SIZE;
	283	function =
	284	ACPI_WRITE \| (obj_desc->field.attribute << 16);
2da120b6 BM	285	} else if (obj_desc->field.region_obj->region.space_id ==
	286	ACPI_ADR_SPACE_GSBUS) {
	287	length = ACPI_GSBUS_BUFFER_SIZE;
	288	function =
	289	ACPI_WRITE \| (obj_desc->field.attribute << 16);
6557a49a LM	290	} else { /* IPMI */
	291
	292	length = ACPI_IPMI_BUFFER_SIZE;
	293	function = ACPI_WRITE;
	294	}
	295
	296	if (source_desc->buffer.length < length) {
b8e4d893	297	ACPI_ERROR((AE_INFO,
2da120b6	298	"SMBus/IPMI/GenericSerialBus write requires Buffer of length %u, found length %u",
6557a49a	299	length, source_desc->buffer.length));
44f6c012	300
4be44fcd	301	return_ACPI_STATUS(AE_AML_BUFFER_LIMIT);
1da177e4 LT	302	}
1da177e4 LT	303
6557a49a LM	304	/* Create the bi-directional buffer */
	305
	306	buffer_desc = acpi_ut_create_buffer_object(length);
1da177e4	307	if (!buffer_desc) {
4be44fcd	308	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	309	}
	310
	311	buffer = buffer_desc->buffer.pointer;
6557a49a	312	ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length);
1da177e4 LT	313
	314	/* Lock entire transaction if requested */
	315
ba886cd4	316	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	317
1da177e4 LT	318	/*
44f6c012 RM	319	* Perform the write (returns status and perhaps data in the
44f6c012 RM	320	* same buffer)
1da177e4	321	*/
4be44fcd	322	status = acpi_ex_access_region(obj_desc, 0,
5df7e6cb	323	(u64 *) buffer, function);
f02e9fa1	324	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	325
1da177e4 LT	326	*result_desc = buffer_desc;
4be44fcd	327	return_ACPI_STATUS(status);
1da177e4 LT	328	}
1da177e4 LT	329
44f6c012 RM	330	/* Get a pointer to the data to be written */
44f6c012 RM	331
3371c19c	332	switch (source_desc->common.type) {
1da177e4 LT	333	case ACPI_TYPE_INTEGER:
1da177e4 LT	334	buffer = &source_desc->integer.value;
4be44fcd	335	length = sizeof(source_desc->integer.value);
1da177e4 LT	336	break;
	337
	338	case ACPI_TYPE_BUFFER:
	339	buffer = source_desc->buffer.pointer;
	340	length = source_desc->buffer.length;
	341	break;
	342
	343	case ACPI_TYPE_STRING:
	344	buffer = source_desc->string.pointer;
	345	length = source_desc->string.length;
	346	break;
	347
	348	default:
4be44fcd	349	return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
1da177e4 LT	350	}
1da177e4 LT	351
4be44fcd	352	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	353	"FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
4be44fcd	354	source_desc,
3371c19c BM	355	acpi_ut_get_type_name(source_desc->common.type),
3371c19c BM	356	source_desc->common.type, buffer, length));
4be44fcd LB	357
4be44fcd LB	358	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
b229cf92	359	"FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
4be44fcd	360	obj_desc,
3371c19c BM	361	acpi_ut_get_type_name(obj_desc->common.type),
3371c19c BM	362	obj_desc->common.type,
4be44fcd LB	363	obj_desc->common_field.bit_length,
	364	obj_desc->common_field.start_field_bit_offset,
	365	obj_desc->common_field.base_byte_offset));
1da177e4 LT	366
	367	/* Lock entire transaction if requested */
	368
ba886cd4	369	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);
1da177e4 LT	370
	371	/* Write to the field */
	372
4be44fcd	373	status = acpi_ex_insert_into_field(obj_desc, buffer, length);
f02e9fa1	374	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
1da177e4	375
4be44fcd	376	return_ACPI_STATUS(status);
1da177e4	377	}