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diff --git a/drivers/acpi/executer/exfield.c b/drivers/acpi/executer/exfield.c
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+/******************************************************************************
+ *
+ * Module Name: exfield - ACPI AML (p-code) execution - field manipulation
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2005, R. Byron Moore
+ * 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 <acpi/acdispat.h>
+#include <acpi/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;
+ u8 locked;
+
+
+ ACPI_FUNCTION_TRACE_PTR ("ex_read_data_from_field", obj_desc);
+
+
+ /* Parameter validation */
+
+ if (!obj_desc) {
+ return_ACPI_STATUS (AE_AML_NO_OPERAND);
+ }
+
+ if (ACPI_GET_OBJECT_TYPE (obj_desc) == 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 ((ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD) &&
+ (obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_SMBUS)) {
+ /*
+ * This is an SMBus read. We must create a buffer to hold the data
+ * and directly access the region handler.
+ */
+ buffer_desc = acpi_ut_create_buffer_object (ACPI_SMBUS_BUFFER_SIZE);
+ if (!buffer_desc) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /* Lock entire transaction if requested */
+
+ locked = acpi_ex_acquire_global_lock (obj_desc->common_field.field_flags);
+
+ /*
+ * Perform the read.
+ * Note: Smbus protocol value is passed in upper 16-bits of Function
+ */
+ status = acpi_ex_access_region (obj_desc, 0,
+ ACPI_CAST_PTR (acpi_integer, buffer_desc->buffer.pointer),
+ ACPI_READ | (obj_desc->field.attribute << 16));
+ acpi_ex_release_global_lock (locked);
+ goto exit;
+ }
+
+ /*
+ * Allocate a buffer for the contents of the field.
+ *
+ * If the field is larger than the size of an acpi_integer, 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_internal_object (ACPI_TYPE_INTEGER);
+ if (!buffer_desc) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ length = acpi_gbl_integer_byte_width;
+ buffer_desc->integer.value = 0;
+ buffer = &buffer_desc->integer.value;
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
+ "field_read [TO]: Obj %p, Type %X, Buf %p, byte_len %X\n",
+ obj_desc, ACPI_GET_OBJECT_TYPE (obj_desc), buffer, (u32) length));
+ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
+ "field_read [FROM]: bit_len %X, bit_off %X, byte_off %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 */
+
+ locked = 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 (locked);
+
+
+exit:
+ if (ACPI_FAILURE (status)) {
+ acpi_ut_remove_reference (buffer_desc);
+ }
+ else if (ret_buffer_desc) {
+ *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
+ *
+ * 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;
+ u32 required_length;
+ void *buffer;
+ void *new_buffer;
+ u8 locked;
+ union acpi_operand_object *buffer_desc;
+
+
+ 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 (ACPI_GET_OBJECT_TYPE (obj_desc) == 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 ((ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_LOCAL_REGION_FIELD) &&
+ (obj_desc->field.region_obj->region.space_id == ACPI_ADR_SPACE_SMBUS)) {
+ /*
+ * This is an SMBus write. We will bypass the entire field mechanism
+ * and handoff the buffer directly to the handler.
+ *
+ * Source must be a buffer of sufficient size (ACPI_SMBUS_BUFFER_SIZE).
+ */
+ if (ACPI_GET_OBJECT_TYPE (source_desc) != ACPI_TYPE_BUFFER) {
+ ACPI_REPORT_ERROR (("SMBus write requires Buffer, found type %s\n",
+ acpi_ut_get_object_type_name (source_desc)));
+ return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
+ }
+
+ if (source_desc->buffer.length < ACPI_SMBUS_BUFFER_SIZE) {
+ ACPI_REPORT_ERROR (("SMBus write requires Buffer of length %X, found length %X\n",
+ ACPI_SMBUS_BUFFER_SIZE, source_desc->buffer.length));
+ return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
+ }
+
+ buffer_desc = acpi_ut_create_buffer_object (ACPI_SMBUS_BUFFER_SIZE);
+ if (!buffer_desc) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ buffer = buffer_desc->buffer.pointer;
+ ACPI_MEMCPY (buffer, source_desc->buffer.pointer, ACPI_SMBUS_BUFFER_SIZE);
+
+ /* Lock entire transaction if requested */
+
+ locked = acpi_ex_acquire_global_lock (obj_desc->common_field.field_flags);
+
+ /*
+ * Perform the write (returns status and perhaps data in the same buffer)
+ * Note: SMBus protocol type is passed in upper 16-bits of Function.
+ */
+ status = acpi_ex_access_region (obj_desc, 0,
+ (acpi_integer *) buffer,
+ ACPI_WRITE | (obj_desc->field.attribute << 16));
+ acpi_ex_release_global_lock (locked);
+
+ *result_desc = buffer_desc;
+ return_ACPI_STATUS (status);
+ }
+
+ /*
+ * Get a pointer to the data to be written
+ */
+ switch (ACPI_GET_OBJECT_TYPE (source_desc)) {
+ 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);
+ }
+
+ /*
+ * We must have a buffer that is at least as long as the field
+ * we are writing to. This is because individual fields are
+ * indivisible and partial writes are not supported -- as per
+ * the ACPI specification.
+ */
+ new_buffer = NULL;
+ required_length = ACPI_ROUND_BITS_UP_TO_BYTES (obj_desc->common_field.bit_length);
+
+ if (length < required_length) {
+ /* We need to create a new buffer */
+
+ new_buffer = ACPI_MEM_CALLOCATE (required_length);
+ if (!new_buffer) {
+ return_ACPI_STATUS (AE_NO_MEMORY);
+ }
+
+ /*
+ * Copy the original data to the new buffer, starting
+ * at Byte zero. All unused (upper) bytes of the
+ * buffer will be 0.
+ */
+ ACPI_MEMCPY ((char *) new_buffer, (char *) buffer, length);
+ buffer = new_buffer;
+ length = required_length;
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
+ "field_write [FROM]: Obj %p (%s:%X), Buf %p, byte_len %X\n",
+ source_desc, acpi_ut_get_type_name (ACPI_GET_OBJECT_TYPE (source_desc)),
+ ACPI_GET_OBJECT_TYPE (source_desc), buffer, length));
+ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
+ "field_write [TO]: Obj %p (%s:%X), bit_len %X, bit_off %X, byte_off %X\n",
+ obj_desc, acpi_ut_get_type_name (ACPI_GET_OBJECT_TYPE (obj_desc)),
+ ACPI_GET_OBJECT_TYPE (obj_desc),
+ 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 */
+
+ locked = 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 (locked);
+
+ /* Free temporary buffer if we used one */
+
+ if (new_buffer) {
+ ACPI_MEM_FREE (new_buffer);
+ }
+
+ return_ACPI_STATUS (status);
+}
+
+
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