drivers/acpi/resources/rsutils.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: rsutils - Utilities for the resource manager
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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
  44
  45 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acresrc.h>
  48
  49
  50 #define _COMPONENT          ACPI_RESOURCES
  51          ACPI_MODULE_NAME    ("rsutils")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_rs_get_prt_method_data
  57  *
  58  * PARAMETERS:  Handle          - a handle to the containing object
  59  *              ret_buffer      - a pointer to a buffer structure for the
  60  *                                  results
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: This function is called to get the _PRT value of an object
  65  *              contained in an object specified by the handle passed in
  66  *
  67  *              If the function fails an appropriate status will be returned
  68  *              and the contents of the callers buffer is undefined.
  69  *
  70  ******************************************************************************/
  71
  72 acpi_status
  73 acpi_rs_get_prt_method_data (
  74         acpi_handle                     handle,
  75         struct acpi_buffer              *ret_buffer)
  76 {
  77         union acpi_operand_object       *obj_desc;
  78         acpi_status                     status;
  79
  80
  81         ACPI_FUNCTION_TRACE ("rs_get_prt_method_data");
  82
  83
  84         /* Parameters guaranteed valid by caller */
  85
  86         /*
  87          * Execute the method, no parameters
  88          */
  89         status = acpi_ut_evaluate_object (handle, "_PRT", ACPI_BTYPE_PACKAGE, &obj_desc);
  90         if (ACPI_FAILURE (status)) {
  91                 return_ACPI_STATUS (status);
  92         }
  93
  94         /*
  95          * Create a resource linked list from the byte stream buffer that comes
  96          * back from the _CRS method execution.
  97          */
  98         status = acpi_rs_create_pci_routing_table (obj_desc, ret_buffer);
  99
 100         /* On exit, we must delete the object returned by evaluate_object */
 101
 102         acpi_ut_remove_reference (obj_desc);
 103         return_ACPI_STATUS (status);
 104 }
 105
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_rs_get_crs_method_data
 110  *
 111  * PARAMETERS:  Handle          - a handle to the containing object
 112  *              ret_buffer      - a pointer to a buffer structure for the
 113  *                                  results
 114  *
 115  * RETURN:      Status
 116  *
 117  * DESCRIPTION: This function is called to get the _CRS value of an object
 118  *              contained in an object specified by the handle passed in
 119  *
 120  *              If the function fails an appropriate status will be returned
 121  *              and the contents of the callers buffer is undefined.
 122  *
 123  ******************************************************************************/
 124
 125 acpi_status
 126 acpi_rs_get_crs_method_data (
 127         acpi_handle                     handle,
 128         struct acpi_buffer              *ret_buffer)
 129 {
 130         union acpi_operand_object       *obj_desc;
 131         acpi_status                     status;
 132
 133
 134         ACPI_FUNCTION_TRACE ("rs_get_crs_method_data");
 135
 136
 137         /* Parameters guaranteed valid by caller */
 138
 139         /*
 140          * Execute the method, no parameters
 141          */
 142         status = acpi_ut_evaluate_object (handle, "_CRS", ACPI_BTYPE_BUFFER, &obj_desc);
 143         if (ACPI_FAILURE (status)) {
 144                 return_ACPI_STATUS (status);
 145         }
 146
 147         /*
 148          * Make the call to create a resource linked list from the
 149          * byte stream buffer that comes back from the _CRS method
 150          * execution.
 151          */
 152         status = acpi_rs_create_resource_list (obj_desc, ret_buffer);
 153
 154         /* on exit, we must delete the object returned by evaluate_object */
 155
 156         acpi_ut_remove_reference (obj_desc);
 157         return_ACPI_STATUS (status);
 158 }
 159
 160
 161 /*******************************************************************************
 162  *
 163  * FUNCTION:    acpi_rs_get_prs_method_data
 164  *
 165  * PARAMETERS:  Handle          - a handle to the containing object
 166  *              ret_buffer      - a pointer to a buffer structure for the
 167  *                                  results
 168  *
 169  * RETURN:      Status
 170  *
 171  * DESCRIPTION: This function is called to get the _PRS value of an object
 172  *              contained in an object specified by the handle passed in
 173  *
 174  *              If the function fails an appropriate status will be returned
 175  *              and the contents of the callers buffer is undefined.
 176  *
 177  ******************************************************************************/
 178 #ifdef ACPI_FUTURE_USAGE
 179 acpi_status
 180 acpi_rs_get_prs_method_data (
 181         acpi_handle                     handle,
 182         struct acpi_buffer              *ret_buffer)
 183 {
 184         union acpi_operand_object       *obj_desc;
 185         acpi_status                     status;
 186
 187
 188         ACPI_FUNCTION_TRACE ("rs_get_prs_method_data");
 189
 190
 191         /* Parameters guaranteed valid by caller */
 192
 193         /*
 194          * Execute the method, no parameters
 195          */
 196         status = acpi_ut_evaluate_object (handle, "_PRS", ACPI_BTYPE_BUFFER, &obj_desc);
 197         if (ACPI_FAILURE (status)) {
 198                 return_ACPI_STATUS (status);
 199         }
 200
 201         /*
 202          * Make the call to create a resource linked list from the
 203          * byte stream buffer that comes back from the _CRS method
 204          * execution.
 205          */
 206         status = acpi_rs_create_resource_list (obj_desc, ret_buffer);
 207
 208         /* on exit, we must delete the object returned by evaluate_object */
 209
 210         acpi_ut_remove_reference (obj_desc);
 211         return_ACPI_STATUS (status);
 212 }
 213 #endif  /*  ACPI_FUTURE_USAGE  */
 214
 215
 216 /*******************************************************************************
 217  *
 218  * FUNCTION:    acpi_rs_get_method_data
 219  *
 220  * PARAMETERS:  Handle          - a handle to the containing object
 221  *              ret_buffer      - a pointer to a buffer structure for the
 222  *                                  results
 223  *
 224  * RETURN:      Status
 225  *
 226  * DESCRIPTION: This function is called to get the _CRS or _PRS value of an
 227  *              object contained in an object specified by the handle passed in
 228  *
 229  *              If the function fails an appropriate status will be returned
 230  *              and the contents of the callers buffer is undefined.
 231  *
 232  ******************************************************************************/
 233
 234 acpi_status
 235 acpi_rs_get_method_data (
 236         acpi_handle                     handle,
 237         char                            *path,
 238         struct acpi_buffer              *ret_buffer)
 239 {
 240         union acpi_operand_object       *obj_desc;
 241         acpi_status                     status;
 242
 243
 244         ACPI_FUNCTION_TRACE ("rs_get_method_data");
 245
 246
 247         /* Parameters guaranteed valid by caller */
 248
 249         /*
 250          * Execute the method, no parameters
 251          */
 252         status = acpi_ut_evaluate_object (handle, path, ACPI_BTYPE_BUFFER, &obj_desc);
 253         if (ACPI_FAILURE (status)) {
 254                 return_ACPI_STATUS (status);
 255         }
 256
 257         /*
 258          * Make the call to create a resource linked list from the
 259          * byte stream buffer that comes back from the method
 260          * execution.
 261          */
 262         status = acpi_rs_create_resource_list (obj_desc, ret_buffer);
 263
 264         /* On exit, we must delete the object returned by evaluate_object */
 265
 266         acpi_ut_remove_reference (obj_desc);
 267         return_ACPI_STATUS (status);
 268 }
 269
 270 /*******************************************************************************
 271  *
 272  * FUNCTION:    acpi_rs_set_srs_method_data
 273  *
 274  * PARAMETERS:  Handle          - a handle to the containing object
 275  *              in_buffer       - a pointer to a buffer structure of the
 276  *                                  parameter
 277  *
 278  * RETURN:      Status
 279  *
 280  * DESCRIPTION: This function is called to set the _SRS of an object contained
 281  *              in an object specified by the handle passed in
 282  *
 283  *              If the function fails an appropriate status will be returned
 284  *              and the contents of the callers buffer is undefined.
 285  *
 286  ******************************************************************************/
 287
 288 acpi_status
 289 acpi_rs_set_srs_method_data (
 290         acpi_handle                     handle,
 291         struct acpi_buffer              *in_buffer)
 292 {
 293         struct acpi_parameter_info      info;
 294         union acpi_operand_object       *params[2];
 295         acpi_status                     status;
 296         struct acpi_buffer              buffer;
 297
 298
 299         ACPI_FUNCTION_TRACE ("rs_set_srs_method_data");
 300
 301
 302         /* Parameters guaranteed valid by caller */
 303
 304         /*
 305          * The in_buffer parameter will point to a linked list of
 306          * resource parameters.  It needs to be formatted into a
 307          * byte stream to be sent in as an input parameter to _SRS
 308          *
 309          * Convert the linked list into a byte stream
 310          */
 311         buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
 312         status = acpi_rs_create_byte_stream (in_buffer->pointer, &buffer);
 313         if (ACPI_FAILURE (status)) {
 314                 return_ACPI_STATUS (status);
 315         }
 316
 317         /*
 318          * Init the param object
 319          */
 320         params[0] = acpi_ut_create_internal_object (ACPI_TYPE_BUFFER);
 321         if (!params[0]) {
 322                 acpi_os_free (buffer.pointer);
 323                 return_ACPI_STATUS (AE_NO_MEMORY);
 324         }
 325
 326         /*
 327          * Set up the parameter object
 328          */
 329         params[0]->buffer.length  = (u32) buffer.length;
 330         params[0]->buffer.pointer = buffer.pointer;
 331         params[0]->common.flags   = AOPOBJ_DATA_VALID;
 332         params[1] = NULL;
 333
 334         info.node = handle;
 335         info.parameters = params;
 336         info.parameter_type = ACPI_PARAM_ARGS;
 337
 338         /*
 339          * Execute the method, no return value
 340          */
 341         status = acpi_ns_evaluate_relative ("_SRS", &info);
 342         if (ACPI_SUCCESS (status)) {
 343                 /* Delete any return object (especially if implicit_return is enabled) */
 344
 345                 if (info.return_object) {
 346                         acpi_ut_remove_reference (info.return_object);
 347                 }
 348         }
 349
 350         /*
 351          * Clean up and return the status from acpi_ns_evaluate_relative
 352          */
 353         acpi_ut_remove_reference (params[0]);
 354         return_ACPI_STATUS (status);
 355 }
 356