sys/OSThermalNotification.c

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <dispatch/dispatch.h>
  25 #include <libkern/OSThermalNotification.h>
  26 #include <notify.h>
  27
  28 #define OSThermalStatusName "com.apple.system.thermalstatus"
  29
  30 const char * const kOSThermalNotificationName = OSThermalStatusName;
  31
  32 static const char * const kOSThermalMitigationNames[kOSThermalMitigationCount] = {
  33         OSThermalStatusName,
  34         "com.apple.system.thermalmitigation.70percenttorch",
  35         "com.apple.system.thermalmitigation.70percentbacklight",
  36         "com.apple.system.thermalmitigation.50percenttorch",
  37         "com.apple.system.thermalmitigation.50percentbacklight",
  38         "com.apple.system.thermalmitigation.disabletorch",
  39         "com.apple.system.thermalmitigation.25percentbacklight",
  40         "com.apple.system.thermalmitigation.disablemapshalo",
  41         "com.apple.system.thermalmitigation.appterminate",
  42         "com.apple.system.thermalmitigation.devicerestart"
  43 };
  44
  45 static int tokens[kOSThermalMitigationCount];
  46 static dispatch_once_t predicates[kOSThermalMitigationCount];
  47
  48 OSThermalNotificationLevel _OSThermalNotificationLevelForBehavior(int behavior)
  49 {
  50         uint64_t val = OSThermalNotificationLevelAny;
  51         if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
  52                 dispatch_once(&predicates[behavior], ^{
  53                                 (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
  54                 });
  55                 (void)notify_get_state(tokens[behavior], &val);
  56         }
  57         return (OSThermalNotificationLevel)val;
  58 }
  59
  60 void _OSThermalNotificationSetLevelForBehavior(int level, int behavior)
  61 {
  62         uint64_t val = (uint64_t)level;
  63         if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
  64                 dispatch_once(&predicates[behavior], ^{
  65                                 (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
  66                 });
  67                 (void)notify_set_state(tokens[behavior], val);
  68         }
  69 }
  70
  71
  72 OSThermalNotificationLevel OSThermalNotificationCurrentLevel(void)
  73 {
  74         return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone);
  75 }