release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/acpi/acpica/dsinit.c

   1 /******************************************************************************
   2  *
   3  * Module Name: dsinit - Object initialization namespace walk
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, Intel Corp.
   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 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acdispat.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_DISPATCHER
  51 ACPI_MODULE_NAME("dsinit")
  52
  53 /* Local prototypes */
  54 static acpi_status
  55 acpi_ds_init_one_object(acpi_handle obj_handle,
  56                         u32 level, void *context, void **return_value);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_ds_init_one_object
  61  *
  62  * PARAMETERS:  obj_handle      - Node for the object
  63  *              Level           - Current nesting level
  64  *              Context         - Points to a init info struct
  65  *              return_value    - Not used
  66  *
  67  * RETURN:      Status
  68  *
  69  * DESCRIPTION: Callback from acpi_walk_namespace. Invoked for every object
  70  *              within the namespace.
  71  *
  72  *              Currently, the only objects that require initialization are:
  73  *              1) Methods
  74  *              2) Operation Regions
  75  *
  76  ******************************************************************************/
  77
  78 static acpi_status
  79 acpi_ds_init_one_object(acpi_handle obj_handle,
  80                         u32 level, void *context, void **return_value)
  81 {
  82         struct acpi_init_walk_info *info =
  83             (struct acpi_init_walk_info *)context;
  84         struct acpi_namespace_node *node =
  85             (struct acpi_namespace_node *)obj_handle;
  86         acpi_object_type type;
  87         acpi_status status;
  88
  89         ACPI_FUNCTION_ENTRY();
  90
  91         /*
  92          * We are only interested in NS nodes owned by the table that
  93          * was just loaded
  94          */
  95         if (node->owner_id != info->owner_id) {
  96                 return (AE_OK);
  97         }
  98
  99         info->object_count++;
 100
 101         /* And even then, we are only interested in a few object types */
 102
 103         type = acpi_ns_get_type(obj_handle);
 104
 105         switch (type) {
 106         case ACPI_TYPE_REGION:
 107
 108                 status = acpi_ds_initialize_region(obj_handle);
 109                 if (ACPI_FAILURE(status)) {
 110                         ACPI_EXCEPTION((AE_INFO, status,
 111                                         "During Region initialization %p [%4.4s]",
 112                                         obj_handle,
 113                                         acpi_ut_get_node_name(obj_handle)));
 114                 }
 115
 116                 info->op_region_count++;
 117                 break;
 118
 119         case ACPI_TYPE_METHOD:
 120
 121                 info->method_count++;
 122                 break;
 123
 124         case ACPI_TYPE_DEVICE:
 125
 126                 info->device_count++;
 127                 break;
 128
 129         default:
 130                 break;
 131         }
 132
 133         /*
 134          * We ignore errors from above, and always return OK, since
 135          * we don't want to abort the walk on a single error.
 136          */
 137         return (AE_OK);
 138 }
 139
 140 /*******************************************************************************
 141  *
 142  * FUNCTION:    acpi_ds_initialize_objects
 143  *
 144  * PARAMETERS:  table_desc      - Descriptor for parent ACPI table
 145  *              start_node      - Root of subtree to be initialized.
 146  *
 147  * RETURN:      Status
 148  *
 149  * DESCRIPTION: Walk the namespace starting at "StartNode" and perform any
 150  *              necessary initialization on the objects found therein
 151  *
 152  ******************************************************************************/
 153
 154 acpi_status
 155 acpi_ds_initialize_objects(u32 table_index,
 156                            struct acpi_namespace_node * start_node)
 157 {
 158         acpi_status status;
 159         struct acpi_init_walk_info info;
 160         struct acpi_table_header *table;
 161         acpi_owner_id owner_id;
 162
 163         ACPI_FUNCTION_TRACE(ds_initialize_objects);
 164
 165         status = acpi_tb_get_owner_id(table_index, &owner_id);
 166         if (ACPI_FAILURE(status)) {
 167                 return_ACPI_STATUS(status);
 168         }
 169
 170         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 171                           "**** Starting initialization of namespace objects ****\n"));
 172         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Parsing all Control Methods:"));
 173
 174         /* Set all init info to zero */
 175
 176         ACPI_MEMSET(&info, 0, sizeof(struct acpi_init_walk_info));
 177
 178         info.owner_id = owner_id;
 179         info.table_index = table_index;
 180
 181         /* Walk entire namespace from the supplied root */
 182
 183         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 184         if (ACPI_FAILURE(status)) {
 185                 return_ACPI_STATUS(status);
 186         }
 187
 188         /*
 189          * We don't use acpi_walk_namespace since we do not want to acquire
 190          * the namespace reader lock.
 191          */
 192         status =
 193             acpi_ns_walk_namespace(ACPI_TYPE_ANY, start_node, ACPI_UINT32_MAX,
 194                                    ACPI_NS_WALK_UNLOCK, acpi_ds_init_one_object,
 195                                    NULL, &info, NULL);
 196         if (ACPI_FAILURE(status)) {
 197                 ACPI_EXCEPTION((AE_INFO, status, "During WalkNamespace"));
 198         }
 199         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 200
 201         status = acpi_get_table_by_index(table_index, &table);
 202         if (ACPI_FAILURE(status)) {
 203                 return_ACPI_STATUS(status);
 204         }
 205
 206         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 207                               "\nTable [%4.4s](id %4.4X) - %u Objects with %u Devices %u Methods %u Regions\n",
 208                               table->signature, owner_id, info.object_count,
 209                               info.device_count, info.method_count,
 210                               info.op_region_count));
 211
 212         ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 213                           "%u Methods, %u Regions\n", info.method_count,
 214                           info.op_region_count));
 215
 216         return_ACPI_STATUS(AE_OK);
 217 }