drivers/acpi/acpica/evmisc.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evmisc - Miscellaneous event manager support functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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 "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evmisc")
  51
  52 /* Local prototypes */
  53 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_is_notify_object
  58  *
  59  * PARAMETERS:  Node            - Node to check
  60  *
  61  * RETURN:      TRUE if notifies allowed on this object
  62  *
  63  * DESCRIPTION: Check type of node for a object that supports notifies.
  64  *
  65  *              TBD: This could be replaced by a flag bit in the node.
  66  *
  67  ******************************************************************************/
  68
  69 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
  70 {
  71         switch (node->type) {
  72         case ACPI_TYPE_DEVICE:
  73         case ACPI_TYPE_PROCESSOR:
  74         case ACPI_TYPE_THERMAL:
  75                 /*
  76                  * These are the ONLY objects that can receive ACPI notifications
  77                  */
  78                 return (TRUE);
  79
  80         default:
  81                 return (FALSE);
  82         }
  83 }
  84
  85 /*******************************************************************************
  86  *
  87  * FUNCTION:    acpi_ev_queue_notify_request
  88  *
  89  * PARAMETERS:  Node            - NS node for the notified object
  90  *              notify_value    - Value from the Notify() request
  91  *
  92  * RETURN:      Status
  93  *
  94  * DESCRIPTION: Dispatch a device notification event to a previously
  95  *              installed handler.
  96  *
  97  ******************************************************************************/
  98
  99 acpi_status
 100 acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 101                              u32 notify_value)
 102 {
 103         union acpi_operand_object *obj_desc;
 104         union acpi_operand_object *handler_obj = NULL;
 105         union acpi_generic_state *notify_info;
 106         acpi_status status = AE_OK;
 107
 108         ACPI_FUNCTION_NAME(ev_queue_notify_request);
 109
 110         /*
 111          * For value 3 (Ejection Request), some device method may need to be run.
 112          * For value 2 (Device Wake) if _PRW exists, the _PS0 method may need
 113          *   to be run.
 114          * For value 0x80 (Status Change) on the power button or sleep button,
 115          *   initiate soft-off or sleep operation?
 116          */
 117         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 118                           "Dispatching Notify on [%4.4s] Node %p Value 0x%2.2X (%s)\n",
 119                           acpi_ut_get_node_name(node), node, notify_value,
 120                           acpi_ut_get_notify_name(notify_value)));
 121
 122         /* Get the notify object attached to the NS Node */
 123
 124         obj_desc = acpi_ns_get_attached_object(node);
 125         if (obj_desc) {
 126
 127                 /* We have the notify object, Get the right handler */
 128
 129                 switch (node->type) {
 130
 131                         /* Notify allowed only on these types */
 132
 133                 case ACPI_TYPE_DEVICE:
 134                 case ACPI_TYPE_THERMAL:
 135                 case ACPI_TYPE_PROCESSOR:
 136
 137                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
 138                                 handler_obj =
 139                                     obj_desc->common_notify.system_notify;
 140                         } else {
 141                                 handler_obj =
 142                                     obj_desc->common_notify.device_notify;
 143                         }
 144                         break;
 145
 146                 default:
 147
 148                         /* All other types are not supported */
 149
 150                         return (AE_TYPE);
 151                 }
 152         }
 153
 154         /*
 155          * If there is any handler to run, schedule the dispatcher.
 156          * Check for:
 157          * 1) Global system notify handler
 158          * 2) Global device notify handler
 159          * 3) Per-device notify handler
 160          */
 161         if ((acpi_gbl_system_notify.handler &&
 162              (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
 163             (acpi_gbl_device_notify.handler &&
 164              (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
 165                 notify_info = acpi_ut_create_generic_state();
 166                 if (!notify_info) {
 167                         return (AE_NO_MEMORY);
 168                 }
 169
 170                 if (!handler_obj) {
 171                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 172                                           "Executing system notify handler for Notify (%4.4s, %X) "
 173                                           "node %p\n",
 174                                           acpi_ut_get_node_name(node),
 175                                           notify_value, node));
 176                 }
 177
 178                 notify_info->common.descriptor_type =
 179                     ACPI_DESC_TYPE_STATE_NOTIFY;
 180                 notify_info->notify.node = node;
 181                 notify_info->notify.value = (u16) notify_value;
 182                 notify_info->notify.handler_obj = handler_obj;
 183
 184                 status =
 185                     acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
 186                                     notify_info);
 187                 if (ACPI_FAILURE(status)) {
 188                         acpi_ut_delete_generic_state(notify_info);
 189                 }
 190         } else {
 191                 /* There is no notify handler (per-device or system) for this device */
 192
 193                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 194                                   "No notify handler for Notify (%4.4s, %X) node %p\n",
 195                                   acpi_ut_get_node_name(node), notify_value,
 196                                   node));
 197         }
 198
 199         return (status);
 200 }
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_ev_notify_dispatch
 205  *
 206  * PARAMETERS:  Context         - To be passed to the notify handler
 207  *
 208  * RETURN:      None.
 209  *
 210  * DESCRIPTION: Dispatch a device notification event to a previously
 211  *              installed handler.
 212  *
 213  ******************************************************************************/
 214
 215 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 216 {
 217         union acpi_generic_state *notify_info =
 218             (union acpi_generic_state *)context;
 219         acpi_notify_handler global_handler = NULL;
 220         void *global_context = NULL;
 221         union acpi_operand_object *handler_obj;
 222
 223         ACPI_FUNCTION_ENTRY();
 224
 225         /*
 226          * We will invoke a global notify handler if installed. This is done
 227          * _before_ we invoke the per-device handler attached to the device.
 228          */
 229         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
 230
 231                 /* Global system notification handler */
 232
 233                 if (acpi_gbl_system_notify.handler) {
 234                         global_handler = acpi_gbl_system_notify.handler;
 235                         global_context = acpi_gbl_system_notify.context;
 236                 }
 237         } else {
 238                 /* Global driver notification handler */
 239
 240                 if (acpi_gbl_device_notify.handler) {
 241                         global_handler = acpi_gbl_device_notify.handler;
 242                         global_context = acpi_gbl_device_notify.context;
 243                 }
 244         }
 245
 246         /* Invoke the system handler first, if present */
 247
 248         if (global_handler) {
 249                 global_handler(notify_info->notify.node,
 250                                notify_info->notify.value, global_context);
 251         }
 252
 253         /* Now invoke the per-device handler, if present */
 254
 255         handler_obj = notify_info->notify.handler_obj;
 256         if (handler_obj) {
 257                 struct acpi_object_notify_handler *notifier;
 258
 259                 notifier = &handler_obj->notify;
 260                 while (notifier) {
 261                         notifier->handler(notify_info->notify.node,
 262                                           notify_info->notify.value,
 263                                           notifier->context);
 264                         notifier = notifier->next;
 265                 }
 266         }
 267
 268         /* All done with the info object */
 269
 270         acpi_ut_delete_generic_state(notify_info);
 271 }
 272
 273 /******************************************************************************
 274  *
 275  * FUNCTION:    acpi_ev_terminate
 276  *
 277  * PARAMETERS:  none
 278  *
 279  * RETURN:      none
 280  *
 281  * DESCRIPTION: Disable events and free memory allocated for table storage.
 282  *
 283  ******************************************************************************/
 284
 285 void acpi_ev_terminate(void)
 286 {
 287         u32 i;
 288         acpi_status status;
 289
 290         ACPI_FUNCTION_TRACE(ev_terminate);
 291
 292         if (acpi_gbl_events_initialized) {
 293                 /*
 294                  * Disable all event-related functionality. In all cases, on error,
 295                  * print a message but obviously we don't abort.
 296                  */
 297
 298                 /* Disable all fixed events */
 299
 300                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
 301                         status = acpi_disable_event(i, 0);
 302                         if (ACPI_FAILURE(status)) {
 303                                 ACPI_ERROR((AE_INFO,
 304                                             "Could not disable fixed event %u",
 305                                             (u32) i));
 306                         }
 307                 }
 308
 309                 /* Disable all GPEs in all GPE blocks */
 310
 311                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 312
 313                 /* Remove SCI handler */
 314
 315                 status = acpi_ev_remove_sci_handler();
 316                 if (ACPI_FAILURE(status)) {
 317                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
 318                 }
 319
 320                 status = acpi_ev_remove_global_lock_handler();
 321                 if (ACPI_FAILURE(status)) {
 322                         ACPI_ERROR((AE_INFO,
 323                                     "Could not remove Global Lock handler"));
 324                 }
 325         }
 326
 327         /* Deallocate all handler objects installed within GPE info structs */
 328
 329         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
 330
 331         /* Return to original mode if necessary */
 332
 333         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
 334                 status = acpi_disable();
 335                 if (ACPI_FAILURE(status)) {
 336                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
 337                 }
 338         }
 339         return_VOID;
 340 }