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 - 2006, 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 #include <acpi/acpi.h>
  46 #include <acpi/acnamesp.h>
  47 #include <acpi/acevents.h>
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evxfregn")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_install_address_space_handler
  55  *
  56  * PARAMETERS:  Device          - Handle for the device
  57  *              space_id        - The address space ID
  58  *              Handler         - Address of the handler
  59  *              Setup           - Address of the setup function
  60  *              Context         - Value passed to the handler on each access
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Install a handler for all op_regions of a given space_id.
  65  *
  66  ******************************************************************************/
  67 acpi_status
  68 acpi_install_address_space_handler(acpi_handle device,
  69                                    acpi_adr_space_type space_id,
  70                                    acpi_adr_space_handler handler,
  71                                    acpi_adr_space_setup setup, void *context)
  72 {
  73         struct acpi_namespace_node *node;
  74         acpi_status status;
  75
  76         ACPI_FUNCTION_TRACE("acpi_install_address_space_handler");
  77
  78         /* Parameter validation */
  79
  80         if (!device) {
  81                 return_ACPI_STATUS(AE_BAD_PARAMETER);
  82         }
  83
  84         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
  85         if (ACPI_FAILURE(status)) {
  86                 return_ACPI_STATUS(status);
  87         }
  88
  89         /* Convert and validate the device handle */
  90
  91         node = acpi_ns_map_handle_to_node(device);
  92         if (!node) {
  93                 status = AE_BAD_PARAMETER;
  94                 goto unlock_and_exit;
  95         }
  96
  97         /* Install the handler for all Regions for this Space ID */
  98
  99         status =
 100             acpi_ev_install_space_handler(node, space_id, handler, setup,
 101                                           context);
 102         if (ACPI_FAILURE(status)) {
 103                 goto unlock_and_exit;
 104         }
 105
 106         /* Run all _REG methods for this address space */
 107
 108         status = acpi_ev_execute_reg_methods(node, space_id);
 109
 110       unlock_and_exit:
 111         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 112         return_ACPI_STATUS(status);
 113 }
 114
 115 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler)
 116
 117 /*******************************************************************************
 118  *
 119  * FUNCTION:    acpi_remove_address_space_handler
 120  *
 121  * PARAMETERS:  Device          - Handle for the device
 122  *              space_id        - The address space ID
 123  *              Handler         - Address of the handler
 124  *
 125  * RETURN:      Status
 126  *
 127  * DESCRIPTION: Remove a previously installed handler.
 128  *
 129  ******************************************************************************/
 130 acpi_status
 131 acpi_remove_address_space_handler(acpi_handle device,
 132                                   acpi_adr_space_type space_id,
 133                                   acpi_adr_space_handler handler)
 134 {
 135         union acpi_operand_object *obj_desc;
 136         union acpi_operand_object *handler_obj;
 137         union acpi_operand_object *region_obj;
 138         union acpi_operand_object **last_obj_ptr;
 139         struct acpi_namespace_node *node;
 140         acpi_status status;
 141
 142         ACPI_FUNCTION_TRACE("acpi_remove_address_space_handler");
 143
 144         /* Parameter validation */
 145
 146         if (!device) {
 147                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 148         }
 149
 150         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 151         if (ACPI_FAILURE(status)) {
 152                 return_ACPI_STATUS(status);
 153         }
 154
 155         /* Convert and validate the device handle */
 156
 157         node = acpi_ns_map_handle_to_node(device);
 158         if (!node) {
 159                 status = AE_BAD_PARAMETER;
 160                 goto unlock_and_exit;
 161         }
 162
 163         /* Make sure the internal object exists */
 164
 165         obj_desc = acpi_ns_get_attached_object(node);
 166         if (!obj_desc) {
 167                 status = AE_NOT_EXIST;
 168                 goto unlock_and_exit;
 169         }
 170
 171         /* Find the address handler the user requested */
 172
 173         handler_obj = obj_desc->device.handler;
 174         last_obj_ptr = &obj_desc->device.handler;
 175         while (handler_obj) {
 176
 177                 /* We have a handler, see if user requested this one */
 178
 179                 if (handler_obj->address_space.space_id == space_id) {
 180
 181                         /* Matched space_id, first dereference this in the Regions */
 182
 183                         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 184                                           "Removing address handler %p(%p) for region %s on Device %p(%p)\n",
 185                                           handler_obj, handler,
 186                                           acpi_ut_get_region_name(space_id),
 187                                           node, obj_desc));
 188
 189                         region_obj = handler_obj->address_space.region_list;
 190
 191                         /* Walk the handler's region list */
 192
 193                         while (region_obj) {
 194                                 /*
 195                                  * First disassociate the handler from the region.
 196                                  *
 197                                  * NOTE: this doesn't mean that the region goes away
 198                                  * The region is just inaccessible as indicated to
 199                                  * the _REG method
 200                                  */
 201                                 acpi_ev_detach_region(region_obj, TRUE);
 202
 203                                 /*
 204                                  * Walk the list: Just grab the head because the
 205                                  * detach_region removed the previous head.
 206                                  */
 207                                 region_obj =
 208                                     handler_obj->address_space.region_list;
 209
 210                         }
 211
 212                         /* Remove this Handler object from the list */
 213
 214                         *last_obj_ptr = handler_obj->address_space.next;
 215
 216                         /* Now we can delete the handler object */
 217
 218                         acpi_ut_remove_reference(handler_obj);
 219                         goto unlock_and_exit;
 220                 }
 221
 222                 /* Walk the linked list of handlers */
 223
 224                 last_obj_ptr = &handler_obj->address_space.next;
 225                 handler_obj = handler_obj->address_space.next;
 226         }
 227
 228         /* The handler does not exist */
 229
 230         ACPI_DEBUG_PRINT((ACPI_DB_OPREGION,
 231                           "Unable to remove address handler %p for %s(%X), dev_node %p, obj %p\n",
 232                           handler, acpi_ut_get_region_name(space_id), space_id,
 233                           node, obj_desc));
 234
 235         status = AE_NOT_EXIST;
 236
 237       unlock_and_exit:
 238         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 239         return_ACPI_STATUS(status);
 240 }
 241
 242 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler)