Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exfield - ACPI AML (p-code) execution - field manipulation |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | a8357b0 | 2010-01-22 19:07:36 +0800 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2010, Intel Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 45 | #include "accommon.h" |
| 46 | #include "acdispat.h" |
| 47 | #include "acinterp.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #define _COMPONENT ACPI_EXECUTER |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | ACPI_MODULE_NAME("exfield") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 71 | acpi_status status; |
| 72 | union acpi_operand_object *buffer_desc; |
| 73 | acpi_size length; |
| 74 | void *buffer; |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 75 | u32 function; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 77 | ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | /* Parameter validation */ |
| 80 | |
| 81 | if (!obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 82 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 84 | if (!ret_buffer_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 86 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 88 | if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 94 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
| 95 | if (ACPI_FAILURE(status)) { |
| 96 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | } |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 99 | } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && |
| 100 | (obj_desc->field.region_obj->region.space_id == |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 101 | ACPI_ADR_SPACE_SMBUS |
| 102 | || obj_desc->field.region_obj->region.space_id == |
| 103 | ACPI_ADR_SPACE_IPMI)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | /* |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | */ |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | if (!buffer_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 123 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | /* Lock entire transaction if requested */ |
| 127 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 128 | acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 130 | /* Call the region handler for the read */ |
| 131 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 132 | status = acpi_ex_access_region(obj_desc, 0, |
Bob Moore | 5df7e6c | 2010-01-21 10:06:32 +0800 | [diff] [blame] | 133 | ACPI_CAST_PTR(u64, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 134 | buffer_desc-> |
| 135 | buffer.pointer), |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 136 | function); |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 137 | acpi_ex_release_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | goto exit; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Allocate a buffer for the contents of the field. |
| 143 | * |
Bob Moore | 5df7e6c | 2010-01-21 10:06:32 +0800 | [diff] [blame] | 144 | * If the field is larger than the current integer width, create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 151 | length = |
| 152 | (acpi_size) ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | if (length > acpi_gbl_integer_byte_width) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /* Field is too large for an Integer, create a Buffer instead */ |
| 156 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 157 | buffer_desc = acpi_ut_create_buffer_object(length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | if (!buffer_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | buffer = buffer_desc->buffer.pointer; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 162 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | /* Field will fit within an Integer (normal case) */ |
| 164 | |
Bob Moore | dc95a27 | 2009-11-12 09:52:45 +0800 | [diff] [blame] | 165 | buffer_desc = acpi_ut_create_integer_object((u64) 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (!buffer_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 167 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | length = acpi_gbl_integer_byte_width; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | buffer = &buffer_desc->integer.value; |
| 172 | } |
| 173 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 174 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 175 | "FieldRead [TO]: Obj %p, Type %X, Buf %p, ByteLen %X\n", |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 176 | obj_desc, obj_desc->common.type, buffer, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 177 | (u32) length)); |
| 178 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 179 | "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 180 | obj_desc->common_field.bit_length, |
| 181 | obj_desc->common_field.start_field_bit_offset, |
| 182 | obj_desc->common_field.base_byte_offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | /* Lock entire transaction if requested */ |
| 185 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 186 | acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | /* Read from the field */ |
| 189 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 190 | status = acpi_ex_extract_from_field(obj_desc, buffer, (u32) length); |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 191 | acpi_ex_release_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 193 | exit: |
| 194 | if (ACPI_FAILURE(status)) { |
| 195 | acpi_ut_remove_reference(buffer_desc); |
| 196 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | *ret_buffer_desc = buffer_desc; |
| 198 | } |
| 199 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 209 | * result_desc - Where the return value is returned, if any |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | * |
| 211 | * RETURN: Status |
| 212 | * |
| 213 | * DESCRIPTION: Write to a named field |
| 214 | * |
| 215 | ******************************************************************************/ |
| 216 | |
| 217 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 222 | acpi_status status; |
| 223 | u32 length; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 224 | void *buffer; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 225 | union acpi_operand_object *buffer_desc; |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 226 | u32 function; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 228 | ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
| 230 | /* Parameter validation */ |
| 231 | |
| 232 | if (!source_desc || !obj_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 233 | return_ACPI_STATUS(AE_AML_NO_OPERAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
| 235 | |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 236 | if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 242 | status = acpi_ds_get_buffer_field_arguments(obj_desc); |
| 243 | if (ACPI_FAILURE(status)) { |
| 244 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | } |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 247 | } else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) && |
| 248 | (obj_desc->field.region_obj->region.space_id == |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 249 | ACPI_ADR_SPACE_SMBUS |
| 250 | || obj_desc->field.region_obj->region.space_id == |
| 251 | ACPI_ADR_SPACE_IPMI)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | * |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 258 | * Source must be a buffer of sufficient size: |
| 259 | * ACPI_SMBUS_BUFFER_SIZE or ACPI_IPMI_BUFFER_SIZE. |
| 260 | * |
| 261 | * Note: SMBus protocol type is passed in upper 16-bits of Function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | */ |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 263 | if (source_desc->common.type != ACPI_TYPE_BUFFER) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 264 | ACPI_ERROR((AE_INFO, |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 265 | "SMBus or IPMI write requires Buffer, found type %s", |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 266 | acpi_ut_get_object_type_name(source_desc))); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 267 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 268 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 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) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 283 | ACPI_ERROR((AE_INFO, |
Bob Moore | f6a22b0 | 2010-03-05 17:56:40 +0800 | [diff] [blame] | 284 | "SMBus or IPMI write requires Buffer of length %u, found length %u", |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 285 | length, source_desc->buffer.length)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 286 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 290 | /* Create the bi-directional buffer */ |
| 291 | |
| 292 | buffer_desc = acpi_ut_create_buffer_object(length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | if (!buffer_desc) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 294 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | buffer = buffer_desc->buffer.pointer; |
Lin Ming | 6557a49 | 2009-06-24 11:32:04 +0800 | [diff] [blame] | 298 | ACPI_MEMCPY(buffer, source_desc->buffer.pointer, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | /* Lock entire transaction if requested */ |
| 301 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 302 | acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
| 304 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 305 | * Perform the write (returns status and perhaps data in the |
| 306 | * same buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 308 | status = acpi_ex_access_region(obj_desc, 0, |
Bob Moore | 5df7e6c | 2010-01-21 10:06:32 +0800 | [diff] [blame] | 309 | (u64 *) buffer, function); |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 310 | acpi_ex_release_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | *result_desc = buffer_desc; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 313 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
| 315 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 316 | /* Get a pointer to the data to be written */ |
| 317 | |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 318 | switch (source_desc->common.type) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | case ACPI_TYPE_INTEGER: |
| 320 | buffer = &source_desc->integer.value; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | length = sizeof(source_desc->integer.value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 335 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 338 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 339 | "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 340 | source_desc, |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 341 | acpi_ut_get_type_name(source_desc->common.type), |
| 342 | source_desc->common.type, buffer, length)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 343 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 344 | ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 345 | "FieldWrite [TO]: Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 346 | obj_desc, |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 347 | acpi_ut_get_type_name(obj_desc->common.type), |
| 348 | obj_desc->common.type, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 349 | obj_desc->common_field.bit_length, |
| 350 | obj_desc->common_field.start_field_bit_offset, |
| 351 | obj_desc->common_field.base_byte_offset)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | /* Lock entire transaction if requested */ |
| 354 | |
Bob Moore | ba886cd | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 355 | acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
| 357 | /* Write to the field */ |
| 358 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 359 | status = acpi_ex_insert_into_field(obj_desc, buffer, length); |
Bob Moore | f02e9fa | 2008-04-10 19:06:37 +0400 | [diff] [blame] | 360 | acpi_ex_release_global_lock(obj_desc->common_field.field_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 362 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |