1 /****************************************************************************** 2 * 3 * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and 4 * Address Spaces. 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2010, Intel Corp. 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 "accommon.h" 47 #include "acnamesp.h" 48 #include "acevents.h" 49 50 #define _COMPONENT ACPI_EVENTS 51 ACPI_MODULE_NAME("evxfregn") 52 53 /******************************************************************************* 54 * 55 * FUNCTION: acpi_install_address_space_handler 56 * 57 * PARAMETERS: Device - Handle for the device 58 * space_id - The address space ID 59 * Handler - Address of the handler 60 * Setup - Address of the setup function 61 * Context - Value passed to the handler on each access 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Install a handler for all op_regions of a given space_id. 66 * 67 ******************************************************************************/ 68 acpi_status 69 acpi_install_address_space_handler(acpi_handle device, 70 acpi_adr_space_type space_id, 71 acpi_adr_space_handler handler, 72 acpi_adr_space_setup setup, void *context) 73 { 74 struct acpi_namespace_node *node; 75 acpi_status status; 76 77 ACPI_FUNCTION_TRACE(acpi_install_address_space_handler); 78 79 /* Parameter validation */ 80 81 if (!device) { 82 return_ACPI_STATUS(AE_BAD_PARAMETER); 83 } 84 85 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 86 if (ACPI_FAILURE(status)) { 87 return_ACPI_STATUS(status); 88 } 89 90 /* Convert and validate the device handle */ 91 92 node = acpi_ns_validate_handle(device); 93 if (!node) { 94 status = AE_BAD_PARAMETER; 95 goto unlock_and_exit; 96 } 97 98 /* Install the handler for all Regions for this Space ID */ 99 100 status = 101 acpi_ev_install_space_handler(node, space_id, handler, setup, 102 context); 103 if (ACPI_FAILURE(status)) { 104 goto unlock_and_exit; 105 } 106 107 /* Run all _REG methods for this address space */ 108 109 status = acpi_ev_execute_reg_methods(node, space_id); 110 111 unlock_and_exit: 112 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 113 return_ACPI_STATUS(status); 114 } 115 116 ACPI_EXPORT_SYMBOL(acpi_install_address_space_handler) 117 118 /******************************************************************************* 119 * 120 * FUNCTION: acpi_remove_address_space_handler 121 * 122 * PARAMETERS: Device - Handle for the device 123 * space_id - The address space ID 124 * Handler - Address of the handler 125 * 126 * RETURN: Status 127 * 128 * DESCRIPTION: Remove a previously installed handler. 129 * 130 ******************************************************************************/ 131 acpi_status 132 acpi_remove_address_space_handler(acpi_handle device, 133 acpi_adr_space_type space_id, 134 acpi_adr_space_handler handler) 135 { 136 union acpi_operand_object *obj_desc; 137 union acpi_operand_object *handler_obj; 138 union acpi_operand_object *region_obj; 139 union acpi_operand_object **last_obj_ptr; 140 struct acpi_namespace_node *node; 141 acpi_status status; 142 143 ACPI_FUNCTION_TRACE(acpi_remove_address_space_handler); 144 145 /* Parameter validation */ 146 147 if (!device) { 148 return_ACPI_STATUS(AE_BAD_PARAMETER); 149 } 150 151 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); 152 if (ACPI_FAILURE(status)) { 153 return_ACPI_STATUS(status); 154 } 155 156 /* Convert and validate the device handle */ 157 158 node = acpi_ns_validate_handle(device); 159 if (!node || 160 ((node->type != ACPI_TYPE_DEVICE) && 161 (node->type != ACPI_TYPE_PROCESSOR) && 162 (node->type != ACPI_TYPE_THERMAL) && 163 (node != acpi_gbl_root_node))) { 164 status = AE_BAD_PARAMETER; 165 goto unlock_and_exit; 166 } 167 168 /* Make sure the internal object exists */ 169 170 obj_desc = acpi_ns_get_attached_object(node); 171 if (!obj_desc) { 172 status = AE_NOT_EXIST; 173 goto unlock_and_exit; 174 } 175 176 /* Find the address handler the user requested */ 177 178 handler_obj = obj_desc->device.handler; 179 last_obj_ptr = &obj_desc->device.handler; 180 while (handler_obj) { 181 182 /* We have a handler, see if user requested this one */ 183 184 if (handler_obj->address_space.space_id == space_id) { 185 186 /* Handler must be the same as the installed handler */ 187 188 if (handler_obj->address_space.handler != handler) { 189 status = AE_BAD_PARAMETER; 190 goto unlock_and_exit; 191 } 192 193 /* Matched space_id, first dereference this in the Regions */ 194 195 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 196 "Removing address handler %p(%p) for region %s " 197 "on Device %p(%p)\n", 198 handler_obj, handler, 199 acpi_ut_get_region_name(space_id), 200 node, obj_desc)); 201 202 region_obj = handler_obj->address_space.region_list; 203 204 /* Walk the handler's region list */ 205 206 while (region_obj) { 207 /* 208 * First disassociate the handler from the region. 209 * 210 * NOTE: this doesn't mean that the region goes away 211 * The region is just inaccessible as indicated to 212 * the _REG method 213 */ 214 acpi_ev_detach_region(region_obj, TRUE); 215 216 /* 217 * Walk the list: Just grab the head because the 218 * detach_region removed the previous head. 219 */ 220 region_obj = 221 handler_obj->address_space.region_list; 222 223 } 224 225 /* Remove this Handler object from the list */ 226 227 *last_obj_ptr = handler_obj->address_space.next; 228 229 /* Now we can delete the handler object */ 230 231 acpi_ut_remove_reference(handler_obj); 232 goto unlock_and_exit; 233 } 234 235 /* Walk the linked list of handlers */ 236 237 last_obj_ptr = &handler_obj->address_space.next; 238 handler_obj = handler_obj->address_space.next; 239 } 240 241 /* The handler does not exist */ 242 243 ACPI_DEBUG_PRINT((ACPI_DB_OPREGION, 244 "Unable to remove address handler %p for %s(%X), DevNode %p, obj %p\n", 245 handler, acpi_ut_get_region_name(space_id), space_id, 246 node, obj_desc)); 247 248 status = AE_NOT_EXIST; 249 250 unlock_and_exit: 251 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); 252 return_ACPI_STATUS(status); 253 } 254 255 ACPI_EXPORT_SYMBOL(acpi_remove_address_space_handler) 256