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#include <TargetConditionals.h> 29 30#define OSThermalPressureLevelName "com.apple.system.thermalpressurelevel" 31const char * const kOSThermalNotificationPressureLevelName = OSThermalPressureLevelName; 32 33#if TARGET_OS_IPHONE 34#define OSThermalAlert "com.apple.system.thermalalert" 35#define OSThermalDecision "com.apple.system.thermaldecision" 36#define OSThermalStatusName "com.apple.system.thermalstatus" 37 38const char * const kOSThermalNotificationAlert = OSThermalAlert; 39const char * const kOSThermalNotificationDecision = OSThermalDecision; 40const char * const kOSThermalNotificationName = OSThermalStatusName; 41 42static const char * const kOSThermalMitigationNames[kOSThermalMitigationCount] = { 43 OSThermalStatusName, 44 "com.apple.system.thermalmitigation.70percenttorch", 45 "com.apple.system.thermalmitigation.70percentbacklight", 46 "com.apple.system.thermalmitigation.50percenttorch", 47 "com.apple.system.thermalmitigation.50percentbacklight", 48 "com.apple.system.thermalmitigation.disabletorch", 49 "com.apple.system.thermalmitigation.25percentbacklight", 50 "com.apple.system.thermalmitigation.disablemapshalo", 51 "com.apple.system.thermalmitigation.appterminate", 52 "com.apple.system.thermalmitigation.devicerestart", 53 "com.apple.system.thermalmitigation.thermaltableready" 54}; 55 56static int tokens[kOSThermalMitigationCount]; 57static dispatch_once_t predicates[kOSThermalMitigationCount]; 58static bool thermalLevelsReady = false; 59 60OSThermalNotificationLevel _OSThermalNotificationLevelForBehavior(int behavior) 61{ 62 uint64_t val = OSThermalNotificationLevelAny; 63 if (behavior >= 0 && behavior < kOSThermalMitigationCount) { 64 dispatch_once(&predicates[behavior], ^{ 65 (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]); 66 }); 67 (void)notify_get_state(tokens[behavior], &val); 68 } 69 return (OSThermalNotificationLevel)val; 70} 71 72void _OSThermalNotificationSetLevelForBehavior(int level, int behavior) 73{ 74 uint64_t val = (uint64_t)level; 75 if (behavior >= 0 && behavior < kOSThermalMitigationCount) { 76 dispatch_once(&predicates[behavior], ^{ 77 (void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]); 78 }); 79 (void)notify_set_state(tokens[behavior], val); 80 81 // Note: 82 // - We are ready when we program in the appterminate value. 83 // - Assumes that user programs kOSThermalMitigationNone level less than 84 // kOSThermalMitigationAppTerminate & kOSThermalMitigationDeviceRestart 85 if (behavior == kOSThermalMitigationAppTerminate) { 86 dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{ 87 (void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]); 88 }); 89 (void)notify_set_state(tokens[kOSThermalMitigationThermalTableReady], kOSThermalMitigationCount); 90 } 91 } 92} 93 94 95OSThermalNotificationLevel OSThermalNotificationCurrentLevel(void) 96{ 97 if (thermalLevelsReady) { 98 return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone); 99 } 100 101 uint64_t tableReady = 0; 102 103 dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{ 104 (void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]); 105 }); 106 (void)notify_get_state(tokens[kOSThermalMitigationThermalTableReady], &tableReady); 107 108 // If we are ready then optimize this so we don't call dispatch everytime. 109 if (tableReady == kOSThermalMitigationCount) { 110 thermalLevelsReady = true; 111 return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone); 112 } 113 else { 114 // Allow reset so we can dynamically change the table without thermal trap screen appearing. 115 thermalLevelsReady = false; 116 } 117 118 // Not ready returns -1, which should not be equal or greater than any other thermal state. 119 return OSThermalNotificationLevelAny; 120} 121 122#endif // TARGET_OS_IPHONE 123