Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Module Name: nsxfeval - Public interfaces to the ACPI subsystem |
| 4 | * ACPI Object evaluation interfaces |
| 5 | * |
| 6 | ******************************************************************************/ |
| 7 | |
| 8 | /* |
Bob Moore | 7784813 | 2012-01-12 13:27:23 +0800 | [diff] [blame] | 9 | * Copyright (C) 2000 - 2012, Intel Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * All rights reserved. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions, and the following disclaimer, |
| 17 | * without modification. |
| 18 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| 19 | * substantially similar to the "NO WARRANTY" disclaimer below |
| 20 | * ("Disclaimer") and any redistribution must be conditioned upon |
| 21 | * including a substantially similar Disclaimer requirement for further |
| 22 | * binary redistribution. |
| 23 | * 3. Neither the names of the above-listed copyright holders nor the names |
| 24 | * of any contributors may be used to endorse or promote products derived |
| 25 | * from this software without specific prior written permission. |
| 26 | * |
| 27 | * Alternatively, this software may be distributed under the terms of the |
| 28 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 29 | * Software Foundation. |
| 30 | * |
| 31 | * NO WARRANTY |
| 32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| 35 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 36 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 40 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| 41 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 42 | * POSSIBILITY OF SUCH DAMAGES. |
| 43 | */ |
| 44 | |
Paul Gortmaker | 214f2c9 | 2011-10-26 16:22:14 -0400 | [diff] [blame] | 45 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <acpi/acpi.h> |
Len Brown | e2f7a77 | 2009-01-09 00:30:03 -0500 | [diff] [blame] | 47 | #include "accommon.h" |
| 48 | #include "acnamesp.h" |
| 49 | #include "acinterp.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #define _COMPONENT ACPI_NAMESPACE |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | ACPI_MODULE_NAME("nsxfeval") |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 53 | |
| 54 | /* Local prototypes */ |
| 55 | static void acpi_ns_resolve_references(struct acpi_evaluate_info *info); |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | /******************************************************************************* |
| 58 | * |
| 59 | * FUNCTION: acpi_evaluate_object_typed |
| 60 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 61 | * PARAMETERS: handle - Object handle (optional) |
| 62 | * pathname - Object pathname (optional) |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 63 | * external_params - List of parameters to pass to method, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | * terminated by NULL. May be NULL |
| 65 | * if no parameters are being passed. |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 66 | * return_buffer - Where to put method's return value (if |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | * any). If NULL, no value is returned. |
| 68 | * return_type - Expected type of return object |
| 69 | * |
| 70 | * RETURN: Status |
| 71 | * |
| 72 | * DESCRIPTION: Find and evaluate the given object, passing the given |
| 73 | * parameters if necessary. One of "Handle" or "Pathname" must |
| 74 | * be valid (non-null) |
| 75 | * |
| 76 | ******************************************************************************/ |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 79 | acpi_evaluate_object_typed(acpi_handle handle, |
| 80 | acpi_string pathname, |
Len Brown | fd35094 | 2007-05-09 23:34:35 -0400 | [diff] [blame] | 81 | struct acpi_object_list *external_params, |
| 82 | struct acpi_buffer *return_buffer, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 83 | acpi_object_type return_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | acpi_status status; |
| 86 | u8 must_free = FALSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 88 | ACPI_FUNCTION_TRACE(acpi_evaluate_object_typed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | /* Return buffer must be valid */ |
| 91 | |
| 92 | if (!return_buffer) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 93 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | if (return_buffer->length == ACPI_ALLOCATE_BUFFER) { |
| 97 | must_free = TRUE; |
| 98 | } |
| 99 | |
| 100 | /* Evaluate the object */ |
| 101 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 102 | status = |
| 103 | acpi_evaluate_object(handle, pathname, external_params, |
| 104 | return_buffer); |
| 105 | if (ACPI_FAILURE(status)) { |
| 106 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /* Type ANY means "don't care" */ |
| 110 | |
| 111 | if (return_type == ACPI_TYPE_ANY) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 112 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | if (return_buffer->length == 0) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /* Error because caller specifically asked for a return value */ |
| 118 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 119 | ACPI_ERROR((AE_INFO, "No return value")); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 120 | return_ACPI_STATUS(AE_NULL_OBJECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | /* Examine the object type returned from evaluate_object */ |
| 124 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 125 | if (((union acpi_object *)return_buffer->pointer)->type == return_type) { |
| 126 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /* Return object type does not match requested type */ |
| 130 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 131 | ACPI_ERROR((AE_INFO, |
| 132 | "Incorrect return type [%s] requested [%s]", |
| 133 | acpi_ut_get_type_name(((union acpi_object *)return_buffer-> |
| 134 | pointer)->type), |
| 135 | acpi_ut_get_type_name(return_type))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
| 137 | if (must_free) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | /* Caller used ACPI_ALLOCATE_BUFFER, free the return buffer */ |
| 140 | |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 141 | ACPI_FREE(return_buffer->pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | return_buffer->pointer = NULL; |
| 143 | } |
| 144 | |
| 145 | return_buffer->length = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 146 | return_ACPI_STATUS(AE_TYPE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | } |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 148 | |
| 149 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object_typed) |
Luca Tettamanti | 2c03d07 | 2009-04-07 15:32:59 +0200 | [diff] [blame] | 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /******************************************************************************* |
| 152 | * |
| 153 | * FUNCTION: acpi_evaluate_object |
| 154 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 155 | * PARAMETERS: handle - Object handle (optional) |
| 156 | * pathname - Object pathname (optional) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | * external_params - List of parameters to pass to method, |
| 158 | * terminated by NULL. May be NULL |
| 159 | * if no parameters are being passed. |
| 160 | * return_buffer - Where to put method's return value (if |
| 161 | * any). If NULL, no value is returned. |
| 162 | * |
| 163 | * RETURN: Status |
| 164 | * |
| 165 | * DESCRIPTION: Find and evaluate the given object, passing the given |
| 166 | * parameters if necessary. One of "Handle" or "Pathname" must |
| 167 | * be valid (non-null) |
| 168 | * |
| 169 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 171 | acpi_evaluate_object(acpi_handle handle, |
| 172 | acpi_string pathname, |
| 173 | struct acpi_object_list *external_params, |
| 174 | struct acpi_buffer *return_buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 176 | acpi_status status; |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 177 | struct acpi_evaluate_info *info; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | acpi_size buffer_space_needed; |
| 179 | u32 i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 181 | ACPI_FUNCTION_TRACE(acpi_evaluate_object); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 183 | /* Allocate and initialize the evaluation information block */ |
| 184 | |
| 185 | info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info)); |
| 186 | if (!info) { |
| 187 | return_ACPI_STATUS(AE_NO_MEMORY); |
| 188 | } |
| 189 | |
| 190 | info->pathname = pathname; |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 191 | |
| 192 | /* Convert and validate the device handle */ |
| 193 | |
Bob Moore | f24b664 | 2009-12-11 14:57:00 +0800 | [diff] [blame] | 194 | info->prefix_node = acpi_ns_validate_handle(handle); |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 195 | if (!info->prefix_node) { |
| 196 | status = AE_BAD_PARAMETER; |
| 197 | goto cleanup; |
| 198 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | /* |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 201 | * If there are parameters to be passed to a control method, the external |
| 202 | * objects must all be converted to internal objects |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | */ |
| 204 | if (external_params && external_params->count) { |
| 205 | /* |
| 206 | * Allocate a new parameter block for the internal objects |
| 207 | * Add 1 to count to allow for null terminated internal list |
| 208 | */ |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 209 | info->parameters = ACPI_ALLOCATE_ZEROED(((acpi_size) |
| 210 | external_params-> |
| 211 | count + |
| 212 | 1) * sizeof(void *)); |
| 213 | if (!info->parameters) { |
| 214 | status = AE_NO_MEMORY; |
| 215 | goto cleanup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | } |
| 217 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 218 | /* Convert each external object in the list to an internal object */ |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | for (i = 0; i < external_params->count; i++) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 221 | status = |
| 222 | acpi_ut_copy_eobject_to_iobject(&external_params-> |
| 223 | pointer[i], |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 224 | &info-> |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 225 | parameters[i]); |
| 226 | if (ACPI_FAILURE(status)) { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 227 | goto cleanup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | } |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 230 | info->parameters[external_params->count] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* |
| 234 | * Three major cases: |
| 235 | * 1) Fully qualified pathname |
| 236 | * 2) No handle, not fully qualified pathname (error) |
| 237 | * 3) Valid handle |
| 238 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 239 | if ((pathname) && (acpi_ns_valid_root_prefix(pathname[0]))) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 240 | |
| 241 | /* The path is fully qualified, just evaluate by name */ |
| 242 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 243 | info->prefix_node = NULL; |
| 244 | status = acpi_ns_evaluate(info); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 245 | } else if (!handle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | /* |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 247 | * A handle is optional iff a fully qualified pathname is specified. |
| 248 | * Since we've already handled fully qualified names above, this is |
| 249 | * an error |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | */ |
| 251 | if (!pathname) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 253 | "Both Handle and Pathname are NULL")); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 254 | } else { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 255 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 256 | "Null Handle with relative pathname [%s]", |
| 257 | pathname)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | status = AE_BAD_PARAMETER; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 261 | } else { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 262 | /* We have a namespace a node and a possible relative path */ |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 263 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 264 | status = acpi_ns_evaluate(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | /* |
| 268 | * If we are expecting a return value, and all went well above, |
| 269 | * copy the return value to an external object. |
| 270 | */ |
| 271 | if (return_buffer) { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 272 | if (!info->return_object) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | return_buffer->length = 0; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 274 | } else { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 275 | if (ACPI_GET_DESCRIPTOR_TYPE(info->return_object) == |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 276 | ACPI_DESC_TYPE_NAMED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* |
| 278 | * If we received a NS Node as a return object, this means that |
| 279 | * the object we are evaluating has nothing interesting to |
| 280 | * return (such as a mutex, etc.) We return an error because |
| 281 | * these types are essentially unsupported by this interface. |
| 282 | * We don't check up front because this makes it easier to add |
| 283 | * support for various types at a later date if necessary. |
| 284 | */ |
| 285 | status = AE_TYPE; |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 286 | info->return_object = NULL; /* No need to delete a NS Node */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | return_buffer->length = 0; |
| 288 | } |
| 289 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 290 | if (ACPI_SUCCESS(status)) { |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 291 | |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 292 | /* Dereference Index and ref_of references */ |
| 293 | |
| 294 | acpi_ns_resolve_references(info); |
| 295 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 296 | /* Get the size of the returned object */ |
| 297 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 298 | status = |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 299 | acpi_ut_get_object_size(info->return_object, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 300 | &buffer_space_needed); |
| 301 | if (ACPI_SUCCESS(status)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | /* Validate/Allocate/Clear caller buffer */ |
| 304 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 305 | status = |
| 306 | acpi_ut_initialize_buffer |
| 307 | (return_buffer, |
| 308 | buffer_space_needed); |
| 309 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | /* |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 311 | * Caller's buffer is too small or a new one can't |
| 312 | * be allocated |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 314 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 315 | "Needed buffer size %X, %s\n", |
| 316 | (u32) |
| 317 | buffer_space_needed, |
| 318 | acpi_format_exception |
| 319 | (status))); |
| 320 | } else { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 321 | /* We have enough space for the object, build it */ |
| 322 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 323 | status = |
| 324 | acpi_ut_copy_iobject_to_eobject |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 325 | (info->return_object, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 326 | return_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | } |
| 332 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 333 | if (info->return_object) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | /* |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 335 | * Delete the internal return object. NOTE: Interpreter must be |
| 336 | * locked to avoid race condition. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | */ |
Len Brown | 4d2acd9 | 2007-05-09 22:56:38 -0400 | [diff] [blame] | 338 | acpi_ex_enter_interpreter(); |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 339 | |
Len Brown | 4d2acd9 | 2007-05-09 22:56:38 -0400 | [diff] [blame] | 340 | /* Remove one reference on the return object (should delete it) */ |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 341 | |
Len Brown | 4d2acd9 | 2007-05-09 22:56:38 -0400 | [diff] [blame] | 342 | acpi_ut_remove_reference(info->return_object); |
| 343 | acpi_ex_exit_interpreter(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 346 | cleanup: |
| 347 | |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 348 | /* Free the input parameter list (if we created one) */ |
| 349 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 350 | if (info->parameters) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | /* Free the allocated parameter block */ |
| 353 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 354 | acpi_ut_delete_internal_object_list(info->parameters); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Bob Moore | 4119532 | 2006-05-26 16:36:00 -0400 | [diff] [blame] | 357 | ACPI_FREE(info); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 358 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 361 | ACPI_EXPORT_SYMBOL(acpi_evaluate_object) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | /******************************************************************************* |
| 364 | * |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 365 | * FUNCTION: acpi_ns_resolve_references |
| 366 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 367 | * PARAMETERS: info - Evaluation info block |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 368 | * |
| 369 | * RETURN: Info->return_object is replaced with the dereferenced object |
| 370 | * |
| 371 | * DESCRIPTION: Dereference certain reference objects. Called before an |
| 372 | * internal return object is converted to an external union acpi_object. |
| 373 | * |
| 374 | * Performs an automatic dereference of Index and ref_of reference objects. |
| 375 | * These reference objects are not supported by the union acpi_object, so this is a |
| 376 | * last resort effort to return something useful. Also, provides compatibility |
| 377 | * with other ACPI implementations. |
| 378 | * |
| 379 | * NOTE: does not handle references within returned package objects or nested |
| 380 | * references, but this support could be added later if found to be necessary. |
| 381 | * |
| 382 | ******************************************************************************/ |
| 383 | static void acpi_ns_resolve_references(struct acpi_evaluate_info *info) |
| 384 | { |
| 385 | union acpi_operand_object *obj_desc = NULL; |
| 386 | struct acpi_namespace_node *node; |
| 387 | |
| 388 | /* We are interested in reference objects only */ |
| 389 | |
Bob Moore | 3371c19 | 2009-02-18 14:44:03 +0800 | [diff] [blame] | 390 | if ((info->return_object)->common.type != ACPI_TYPE_LOCAL_REFERENCE) { |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 391 | return; |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Two types of references are supported - those created by Index and |
| 396 | * ref_of operators. A name reference (AML_NAMEPATH_OP) can be converted |
| 397 | * to an union acpi_object, so it is not dereferenced here. A ddb_handle |
| 398 | * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to |
| 399 | * an union acpi_object. |
| 400 | */ |
Bob Moore | 1044f1f | 2008-09-27 11:08:41 +0800 | [diff] [blame] | 401 | switch (info->return_object->reference.class) { |
| 402 | case ACPI_REFCLASS_INDEX: |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 403 | |
| 404 | obj_desc = *(info->return_object->reference.where); |
| 405 | break; |
| 406 | |
Bob Moore | 1044f1f | 2008-09-27 11:08:41 +0800 | [diff] [blame] | 407 | case ACPI_REFCLASS_REFOF: |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 408 | |
| 409 | node = info->return_object->reference.object; |
| 410 | if (node) { |
| 411 | obj_desc = node->object; |
| 412 | } |
| 413 | break; |
| 414 | |
| 415 | default: |
| 416 | return; |
| 417 | } |
| 418 | |
| 419 | /* Replace the existing reference object */ |
| 420 | |
| 421 | if (obj_desc) { |
| 422 | acpi_ut_add_reference(obj_desc); |
| 423 | acpi_ut_remove_reference(info->return_object); |
| 424 | info->return_object = obj_desc; |
| 425 | } |
| 426 | |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | /******************************************************************************* |
| 431 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | * FUNCTION: acpi_walk_namespace |
| 433 | * |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 434 | * PARAMETERS: type - acpi_object_type to search for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | * start_object - Handle in namespace where search begins |
| 436 | * max_depth - Depth to which search is to reach |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 437 | * pre_order_visit - Called during tree pre-order visit |
| 438 | * when an object of "Type" is found |
| 439 | * post_order_visit - Called during tree post-order visit |
| 440 | * when an object of "Type" is found |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 441 | * context - Passed to user function(s) above |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | * return_value - Location where return value of |
| 443 | * user_function is put if terminated early |
| 444 | * |
| 445 | * RETURNS Return value from the user_function if terminated early. |
| 446 | * Otherwise, returns NULL. |
| 447 | * |
| 448 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, |
| 449 | * starting (and ending) at the object specified by start_handle. |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 450 | * The callback function is called whenever an object that matches |
| 451 | * the type parameter is found. If the callback function returns |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | * a non-zero value, the search is terminated immediately and this |
| 453 | * value is returned to the caller. |
| 454 | * |
| 455 | * The point of this procedure is to provide a generic namespace |
| 456 | * walk routine that can be called from multiple places to |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 457 | * provide multiple services; the callback function(s) can be |
| 458 | * tailored to each task, whether it is a print function, |
| 459 | * a compare function, etc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | * |
| 461 | ******************************************************************************/ |
Lin Ming | bbc2413 | 2008-08-04 13:22:10 +0800 | [diff] [blame] | 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 464 | acpi_walk_namespace(acpi_object_type type, |
| 465 | acpi_handle start_object, |
| 466 | u32 max_depth, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 467 | acpi_walk_callback pre_order_visit, |
| 468 | acpi_walk_callback post_order_visit, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 469 | void *context, void **return_value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 471 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 473 | ACPI_FUNCTION_TRACE(acpi_walk_namespace); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | /* Parameter validation */ |
| 476 | |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 477 | if ((type > ACPI_TYPE_LOCAL_MAX) || |
| 478 | (!max_depth) || (!pre_order_visit && !post_order_visit)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 479 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | /* |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 483 | * Need to acquire the namespace reader lock to prevent interference |
| 484 | * with any concurrent table unloads (which causes the deletion of |
| 485 | * namespace objects). We cannot allow the deletion of a namespace node |
| 486 | * while the user function is using it. The exception to this are the |
| 487 | * nodes created and deleted during control method execution -- these |
| 488 | * nodes are marked as temporary nodes and are ignored by the namespace |
| 489 | * walk. Thus, control methods can be executed while holding the |
| 490 | * namespace deletion lock (and the user function can execute control |
| 491 | * methods.) |
| 492 | */ |
| 493 | status = acpi_ut_acquire_read_lock(&acpi_gbl_namespace_rw_lock); |
| 494 | if (ACPI_FAILURE(status)) { |
| 495 | return status; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Lock the namespace around the walk. The namespace will be |
| 500 | * unlocked/locked around each call to the user function - since the user |
| 501 | * function must be allowed to make ACPICA calls itself (for example, it |
| 502 | * will typically execute control methods during device enumeration.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 504 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 505 | if (ACPI_FAILURE(status)) { |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 506 | goto unlock_and_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 509 | status = acpi_ns_walk_namespace(type, start_object, max_depth, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 510 | ACPI_NS_WALK_UNLOCK, pre_order_visit, |
| 511 | post_order_visit, context, |
| 512 | return_value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 514 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
Bob Moore | 8a335a23 | 2009-03-09 16:31:04 +0800 | [diff] [blame] | 515 | |
| 516 | unlock_and_exit: |
| 517 | (void)acpi_ut_release_read_lock(&acpi_gbl_namespace_rw_lock); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 518 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 521 | ACPI_EXPORT_SYMBOL(acpi_walk_namespace) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | |
| 523 | /******************************************************************************* |
| 524 | * |
| 525 | * FUNCTION: acpi_ns_get_device_callback |
| 526 | * |
| 527 | * PARAMETERS: Callback from acpi_get_device |
| 528 | * |
| 529 | * RETURN: Status |
| 530 | * |
| 531 | * DESCRIPTION: Takes callbacks from walk_namespace and filters out all non- |
| 532 | * present devices, or if they specified a HID, it filters based |
| 533 | * on that. |
| 534 | * |
| 535 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 537 | acpi_ns_get_device_callback(acpi_handle obj_handle, |
| 538 | u32 nesting_level, |
| 539 | void *context, void **return_value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 541 | struct acpi_get_devices_info *info = context; |
| 542 | acpi_status status; |
| 543 | struct acpi_namespace_node *node; |
| 544 | u32 flags; |
Lv Zheng | 78e25fe | 2012-10-31 02:25:24 +0000 | [diff] [blame] | 545 | struct acpi_pnp_device_id *hid; |
| 546 | struct acpi_pnp_device_id_list *cid; |
Bob Moore | 67a119f | 2008-06-10 13:42:13 +0800 | [diff] [blame] | 547 | u32 i; |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 548 | u8 found; |
| 549 | int no_match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 551 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 552 | if (ACPI_FAILURE(status)) { |
Bob Moore | 68aafc3 | 2012-10-31 02:26:01 +0000 | [diff] [blame^] | 553 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Bob Moore | f24b664 | 2009-12-11 14:57:00 +0800 | [diff] [blame] | 556 | node = acpi_ns_validate_handle(obj_handle); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 557 | status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
| 558 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | return (status); |
| 560 | } |
| 561 | |
| 562 | if (!node) { |
| 563 | return (AE_BAD_PARAMETER); |
| 564 | } |
| 565 | |
Lin Ming | 5f8902ac | 2010-01-21 09:15:20 +0800 | [diff] [blame] | 566 | /* |
| 567 | * First, filter based on the device HID and CID. |
| 568 | * |
| 569 | * 01/2010: For this case where a specific HID is requested, we don't |
| 570 | * want to run _STA until we have an actual HID match. Thus, we will |
| 571 | * not unnecessarily execute _STA on devices for which the caller |
| 572 | * doesn't care about. Previously, _STA was executed unconditionally |
| 573 | * on all devices found here. |
| 574 | * |
| 575 | * A side-effect of this change is that now we will continue to search |
| 576 | * for a matching HID even under device trees where the parent device |
| 577 | * would have returned a _STA that indicates it is not present or |
| 578 | * not functioning (thus aborting the search on that branch). |
| 579 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (info->hid != NULL) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 581 | status = acpi_ut_execute_HID(node, &hid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | if (status == AE_NOT_FOUND) { |
| 583 | return (AE_OK); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 584 | } else if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | return (AE_CTRL_DEPTH); |
| 586 | } |
| 587 | |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 588 | no_match = ACPI_STRCMP(hid->string, info->hid); |
| 589 | ACPI_FREE(hid); |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 590 | |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 591 | if (no_match) { |
| 592 | /* |
| 593 | * HID does not match, attempt match within the |
| 594 | * list of Compatible IDs (CIDs) |
| 595 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 596 | status = acpi_ut_execute_CID(node, &cid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (status == AE_NOT_FOUND) { |
| 598 | return (AE_OK); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 599 | } else if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | return (AE_CTRL_DEPTH); |
| 601 | } |
| 602 | |
| 603 | /* Walk the CID list */ |
| 604 | |
Andrew Patterson | 02f8a85 | 2008-01-22 17:18:22 -0700 | [diff] [blame] | 605 | found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | for (i = 0; i < cid->count; i++) { |
Bob Moore | 15b8dd5 | 2009-06-29 13:39:29 +0800 | [diff] [blame] | 607 | if (ACPI_STRCMP(cid->ids[i].string, info->hid) |
| 608 | == 0) { |
Andrew Patterson | 02f8a85 | 2008-01-22 17:18:22 -0700 | [diff] [blame] | 609 | found = 1; |
| 610 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
| 612 | } |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 613 | ACPI_FREE(cid); |
Andrew Patterson | 02f8a85 | 2008-01-22 17:18:22 -0700 | [diff] [blame] | 614 | if (!found) |
| 615 | return (AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } |
| 617 | } |
| 618 | |
Lin Ming | 5f8902ac | 2010-01-21 09:15:20 +0800 | [diff] [blame] | 619 | /* Run _STA to determine if device is present */ |
| 620 | |
| 621 | status = acpi_ut_execute_STA(node, &flags); |
| 622 | if (ACPI_FAILURE(status)) { |
| 623 | return (AE_CTRL_DEPTH); |
| 624 | } |
| 625 | |
| 626 | if (!(flags & ACPI_STA_DEVICE_PRESENT) && |
| 627 | !(flags & ACPI_STA_DEVICE_FUNCTIONING)) { |
| 628 | /* |
| 629 | * Don't examine the children of the device only when the |
| 630 | * device is neither present nor functional. See ACPI spec, |
| 631 | * description of _STA for more information. |
| 632 | */ |
| 633 | return (AE_CTRL_DEPTH); |
| 634 | } |
| 635 | |
| 636 | /* We have a valid device, invoke the user function */ |
| 637 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 638 | status = info->user_function(obj_handle, nesting_level, info->context, |
| 639 | return_value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return (status); |
| 641 | } |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | /******************************************************************************* |
| 644 | * |
| 645 | * FUNCTION: acpi_get_devices |
| 646 | * |
| 647 | * PARAMETERS: HID - HID to search for. Can be NULL. |
| 648 | * user_function - Called when a matching object is found |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 649 | * context - Passed to user function |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | * return_value - Location where return value of |
| 651 | * user_function is put if terminated early |
| 652 | * |
| 653 | * RETURNS Return value from the user_function if terminated early. |
| 654 | * Otherwise, returns NULL. |
| 655 | * |
| 656 | * DESCRIPTION: Performs a modified depth-first walk of the namespace tree, |
| 657 | * starting (and ending) at the object specified by start_handle. |
| 658 | * The user_function is called whenever an object of type |
| 659 | * Device is found. If the user function returns |
| 660 | * a non-zero value, the search is terminated immediately and this |
| 661 | * value is returned to the caller. |
| 662 | * |
| 663 | * This is a wrapper for walk_namespace, but the callback performs |
Bob Moore | 549f460 | 2008-04-10 19:06:41 +0400 | [diff] [blame] | 664 | * additional filtering. Please see acpi_ns_get_device_callback. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | * |
| 666 | ******************************************************************************/ |
| 667 | |
| 668 | acpi_status |
Al Viro | 70b30fb | 2007-08-21 16:18:20 +0100 | [diff] [blame] | 669 | acpi_get_devices(const char *HID, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 670 | acpi_walk_callback user_function, |
| 671 | void *context, void **return_value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 673 | acpi_status status; |
| 674 | struct acpi_get_devices_info info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
Bob Moore | b229cf9 | 2006-04-21 17:15:00 -0400 | [diff] [blame] | 676 | ACPI_FUNCTION_TRACE(acpi_get_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /* Parameter validation */ |
| 679 | |
| 680 | if (!user_function) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 681 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
| 684 | /* |
| 685 | * We're going to call their callback from OUR callback, so we need |
| 686 | * to know what it is, and their context parameter. |
| 687 | */ |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 688 | info.hid = HID; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 689 | info.context = context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | info.user_function = user_function; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | /* |
| 693 | * Lock the namespace around the walk. |
| 694 | * The namespace will be unlocked/locked around each call |
| 695 | * to the user function - since this function |
| 696 | * must be allowed to make Acpi calls itself. |
| 697 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 698 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 699 | if (ACPI_FAILURE(status)) { |
| 700 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 703 | status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| 704 | ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, |
Lin Ming | 2263576 | 2009-11-13 10:06:08 +0800 | [diff] [blame] | 705 | acpi_ns_get_device_callback, NULL, |
| 706 | &info, return_value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 708 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
| 709 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 712 | ACPI_EXPORT_SYMBOL(acpi_get_devices) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | /******************************************************************************* |
| 715 | * |
| 716 | * FUNCTION: acpi_attach_data |
| 717 | * |
| 718 | * PARAMETERS: obj_handle - Namespace node |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 719 | * handler - Handler for this attachment |
| 720 | * data - Pointer to data to be attached |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | * |
| 722 | * RETURN: Status |
| 723 | * |
| 724 | * DESCRIPTION: Attach arbitrary data and handler to a namespace node. |
| 725 | * |
| 726 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 728 | acpi_attach_data(acpi_handle obj_handle, |
| 729 | acpi_object_handler handler, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 731 | struct acpi_namespace_node *node; |
| 732 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | /* Parameter validation */ |
| 735 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 736 | if (!obj_handle || !handler || !data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | return (AE_BAD_PARAMETER); |
| 738 | } |
| 739 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 740 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 741 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | return (status); |
| 743 | } |
| 744 | |
| 745 | /* Convert and validate the handle */ |
| 746 | |
Bob Moore | f24b664 | 2009-12-11 14:57:00 +0800 | [diff] [blame] | 747 | node = acpi_ns_validate_handle(obj_handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | if (!node) { |
| 749 | status = AE_BAD_PARAMETER; |
| 750 | goto unlock_and_exit; |
| 751 | } |
| 752 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 753 | status = acpi_ns_attach_data(node, handler, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 755 | unlock_and_exit: |
| 756 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | return (status); |
| 758 | } |
| 759 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 760 | ACPI_EXPORT_SYMBOL(acpi_attach_data) |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | /******************************************************************************* |
| 763 | * |
| 764 | * FUNCTION: acpi_detach_data |
| 765 | * |
| 766 | * PARAMETERS: obj_handle - Namespace node handle |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 767 | * handler - Handler used in call to acpi_attach_data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | * |
| 769 | * RETURN: Status |
| 770 | * |
| 771 | * DESCRIPTION: Remove data that was previously attached to a node. |
| 772 | * |
| 773 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 775 | acpi_detach_data(acpi_handle obj_handle, acpi_object_handler handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 777 | struct acpi_namespace_node *node; |
| 778 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | /* Parameter validation */ |
| 781 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 782 | if (!obj_handle || !handler) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | return (AE_BAD_PARAMETER); |
| 784 | } |
| 785 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 786 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 787 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | return (status); |
| 789 | } |
| 790 | |
| 791 | /* Convert and validate the handle */ |
| 792 | |
Bob Moore | f24b664 | 2009-12-11 14:57:00 +0800 | [diff] [blame] | 793 | node = acpi_ns_validate_handle(obj_handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | if (!node) { |
| 795 | status = AE_BAD_PARAMETER; |
| 796 | goto unlock_and_exit; |
| 797 | } |
| 798 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 799 | status = acpi_ns_detach_data(node, handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 801 | unlock_and_exit: |
| 802 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | return (status); |
| 804 | } |
| 805 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 806 | ACPI_EXPORT_SYMBOL(acpi_detach_data) |
| 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | /******************************************************************************* |
| 809 | * |
| 810 | * FUNCTION: acpi_get_data |
| 811 | * |
| 812 | * PARAMETERS: obj_handle - Namespace node |
Bob Moore | ba494be | 2012-07-12 09:40:10 +0800 | [diff] [blame] | 813 | * handler - Handler used in call to attach_data |
| 814 | * data - Where the data is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | * |
| 816 | * RETURN: Status |
| 817 | * |
| 818 | * DESCRIPTION: Retrieve data that was previously attached to a namespace node. |
| 819 | * |
| 820 | ******************************************************************************/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 822 | acpi_get_data(acpi_handle obj_handle, acpi_object_handler handler, void **data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 824 | struct acpi_namespace_node *node; |
| 825 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
| 827 | /* Parameter validation */ |
| 828 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 829 | if (!obj_handle || !handler || !data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return (AE_BAD_PARAMETER); |
| 831 | } |
| 832 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 833 | status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); |
| 834 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | return (status); |
| 836 | } |
| 837 | |
| 838 | /* Convert and validate the handle */ |
| 839 | |
Bob Moore | f24b664 | 2009-12-11 14:57:00 +0800 | [diff] [blame] | 840 | node = acpi_ns_validate_handle(obj_handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | if (!node) { |
| 842 | status = AE_BAD_PARAMETER; |
| 843 | goto unlock_and_exit; |
| 844 | } |
| 845 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 846 | status = acpi_ns_get_attached_data(node, handler, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 848 | unlock_and_exit: |
| 849 | (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | return (status); |
| 851 | } |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 852 | |
| 853 | ACPI_EXPORT_SYMBOL(acpi_get_data) |