drivers/acpi/events/evxfregn.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
   4  *                         Address Spaces.
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2004, R. Byron Moore
  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
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acnamesp.h>
  48 #include <acpi/acevents.h>
  49
  50 #define _COMPONENT          ACPI_EVENTS
  51          ACPI_MODULE_NAME    ("evxfregn")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_install_address_space_handler
  57  *
  58  * PARAMETERS:  Device          - Handle for the device
  59  *              space_id        - The address space ID
  60  *              Handler         - Address of the handler
  61  *              Setup           - Address of the setup function
  62  *              Context         - Value passed to the handler on each access
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_install_address_space_handler (
  72         acpi_handle                     device,
  73         acpi_adr_space_type             space_id,
  74         acpi_adr_space_handler          handler,
  75         acpi_adr_space_setup            setup,
  76         void                            *context)
  77 {
  78         struct acpi_namespace_node      *node;
  79         acpi_status                     status;
  80
  81
  82         ACPI_FUNCTION_TRACE ("acpi_install_address_space_handler");
  83
  84
  85         /* Parameter validation */
  86
  87         if (!device) {
  88                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  89         }
  90
  91         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
  92         if (ACPI_FAILURE (status)) {
  93                 return_ACPI_STATUS (status);
  94         }
  95
  96         /* Convert and validate the device handle */
  97
  98         node = acpi_ns_map_handle_to_node (device);
  99         if (!node) {
 100                 status = AE_BAD_PARAMETER;
 101                 goto unlock_and_exit;
 102         }
 103
 104         /* Install the handler for all Regions for this Space ID */
 105
 106         status = acpi_ev_install_space_handler (node, space_id, handler, setup, context);
 107         if (ACPI_FAILURE (status)) {
 108                 goto unlock_and_exit;
 109         }
 110
 111         /* Run all _REG methods for this address space */
 112
 113         status = acpi_ev_execute_reg_methods (node, space_id);
 114
 115 unlock_and_exit:
 116         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 117         return_ACPI_STATUS (status);
 118 }
 119
 120
 121 /*******************************************************************************
 122  *
 123  * FUNCTION:    acpi_remove_address_space_handler
 124  *
 125  * PARAMETERS:  Device          - Handle for the device
 126  *              space_id        - The address space ID
 127  *              Handler         - Address of the handler
 128  *
 129  * RETURN:      Status
 130  *
 131  * DESCRIPTION: Remove a previously installed handler.
 132  *
 133  ******************************************************************************/
 134
 135 acpi_status
 136 acpi_remove_address_space_handler (
 137         acpi_handle                     device,
 138         acpi_adr_space_type             space_id,
 139         acpi_adr_space_handler          handler)
 140 {
 141         union acpi_operand_object       *obj_desc;
 142         union acpi_operand_object       *handler_obj;
 143         union acpi_operand_object       *region_obj;
 144         union acpi_operand_object       **last_obj_ptr;
 145         struct acpi_namespace_node      *node;
 146         acpi_status                     status;
 147
 148
 149         ACPI_FUNCTION_TRACE ("acpi_remove_address_space_handler");
 150
 151
 152         /* Parameter validation */
 153
 154         if (!device) {
 155                 return_ACPI_STATUS (AE_BAD_PARAMETER);
 156         }
 157
 158         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
 159         if (ACPI_FAILURE (status)) {
 160                 return_ACPI_STATUS (status);
 161         }
 162
 163         /* Convert and validate the device handle */
 164
 165         node = acpi_ns_map_handle_to_node (device);
 166         if (!node) {
 167                 status = AE_BAD_PARAMETER;
 168                 goto unlock_and_exit;
 169         }
 170
 171         /* Make sure the internal object exists */
 172
 173         obj_desc = acpi_ns_get_attached_object (node);
 174         if (!obj_desc) {
 175                 status = AE_NOT_EXIST;
 176                 goto unlock_and_exit;
 177         }
 178
 179         /* Find the address handler the user requested */
 180
 181         handler_obj = obj_desc->device.handler;
 182         last_obj_ptr = &obj_desc->device.handler;
 183         while (handler_obj) {
 184                 /* We have a handler, see if user requested this one */
 185
 186                 if (handler_obj->address_space.space_id == space_id) {
 187                         /* Matched space_id, first dereference this in the Regions */
 188
 189                         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 190                                 "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
 191                                 handler_obj, handler, acpi_ut_get_region_name (space_id),
 192                                 node, obj_desc));
 193
 194                         region_obj = handler_obj->address_space.region_list;
 195
 196                         /* Walk the handler's region list */
 197
 198                         while (region_obj) {
 199                                 /*
 200                                  * First disassociate the handler from the region.
 201                                  *
 202                                  * NOTE: this doesn't mean that the region goes away
 203                                  * The region is just inaccessible as indicated to
 204                                  * the _REG method
 205                                  */
 206                                 acpi_ev_detach_region (region_obj, TRUE);
 207
 208                                 /*
 209                                  * Walk the list: Just grab the head because the
 210                                  * detach_region removed the previous head.
 211                                  */
 212                                 region_obj = handler_obj->address_space.region_list;
 213
 214                         }
 215
 216                         /* Remove this Handler object from the list */
 217
 218                         *last_obj_ptr = handler_obj->address_space.next;
 219
 220                         /* Now we can delete the handler object */
 221
 222                         acpi_ut_remove_reference (handler_obj);
 223                         goto unlock_and_exit;
 224                 }
 225
 226                 /* Walk the linked list of handlers */
 227
 228                 last_obj_ptr = &handler_obj->address_space.next;
 229                 handler_obj = handler_obj->address_space.next;
 230         }
 231
 232         /* The handler does not exist */
 233
 234         ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION,
 235                 "Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
 236                 handler, acpi_ut_get_region_name (space_id), space_id, node, obj_desc));
 237
 238         status = AE_NOT_EXIST;
 239
 240 unlock_and_exit:
 241         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
 242         return_ACPI_STATUS (status);
 243 }
 244
 245