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	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 <libkern/OSThermalNotification.h>
	25
	26	#include <TargetConditionals.h>
	27
	28	#define OSThermalPressureLevelName "com.apple.system.thermalpressurelevel"
	29	const char * const kOSThermalNotificationPressureLevelName = OSThermalPressureLevelName;
	30
	31	#if TARGET_OS_IPHONE
	32
	33	#include <dispatch/dispatch.h>
	34	#include <notify.h>
	35
	36	#define OSThermalAlert "com.apple.system.thermalalert"
	37	#define OSThermalDecision "com.apple.system.thermaldecision"
	38	#define OSThermalStatusName "com.apple.system.thermalstatus"
	39
	40	const char * const kOSThermalNotificationAlert = OSThermalAlert;
	41	const char * const kOSThermalNotificationDecision = OSThermalDecision;
	42	const char * const kOSThermalNotificationName = OSThermalStatusName;
	43
	44	static const char * const kOSThermalMitigationNames[kOSThermalMitigationCount] = {
	45	OSThermalStatusName,
	46	"com.apple.system.thermalmitigation.70percenttorch",
	47	"com.apple.system.thermalmitigation.70percentbacklight",
	48	"com.apple.system.thermalmitigation.50percenttorch",
	49	"com.apple.system.thermalmitigation.50percentbacklight",
	50	"com.apple.system.thermalmitigation.disabletorch",
	51	"com.apple.system.thermalmitigation.25percentbacklight",
	52	"com.apple.system.thermalmitigation.disablemapshalo",
	53	"com.apple.system.thermalmitigation.appterminate",
	54	"com.apple.system.thermalmitigation.devicerestart",
	55	"com.apple.system.thermalmitigation.thermaltableready"
	56	};
	57
	58	static int tokens[kOSThermalMitigationCount];
	59	static dispatch_once_t predicates[kOSThermalMitigationCount];
	60	static bool thermalLevelsReady = false;
	61
	62	OSThermalNotificationLevel _OSThermalNotificationLevelForBehavior(int behavior)
	63	{
	64	uint64_t val = OSThermalNotificationLevelAny;
	65	if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
	66	dispatch_once(&predicates[behavior], ^{
	67	(void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
	68	});
	69	(void)notify_get_state(tokens[behavior], &val);
	70	}
	71	return (OSThermalNotificationLevel)val;
	72	}
	73
	74	void _OSThermalNotificationSetLevelForBehavior(int level, int behavior)
	75	{
	76	uint64_t val = (uint64_t)level;
	77	if (behavior >= 0 && behavior < kOSThermalMitigationCount) {
	78	dispatch_once(&predicates[behavior], ^{
	79	(void)notify_register_check(kOSThermalMitigationNames[behavior], &tokens[behavior]);
	80	});
	81	(void)notify_set_state(tokens[behavior], val);
	82
	83	// Note:
	84	// - We are ready when we program in the appterminate value.
	85	// - Assumes that user programs kOSThermalMitigationNone level less than
	86	// kOSThermalMitigationAppTerminate & kOSThermalMitigationDeviceRestart
	87	if (behavior == kOSThermalMitigationAppTerminate) {
	88	dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{
	89	(void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]);
	90	});
	91	(void)notify_set_state(tokens[kOSThermalMitigationThermalTableReady], kOSThermalMitigationCount);
	92	}
	93	}
	94	}
	95
	96
	97	OSThermalNotificationLevel OSThermalNotificationCurrentLevel(void)
	98	{
	99	if (thermalLevelsReady) {
	100	return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone);
	101	}
	102
	103	uint64_t tableReady = 0;
	104
	105	dispatch_once(&predicates[kOSThermalMitigationThermalTableReady], ^{
	106	(void)notify_register_check(kOSThermalMitigationNames[kOSThermalMitigationThermalTableReady], &tokens[kOSThermalMitigationThermalTableReady]);
	107	});
	108	(void)notify_get_state(tokens[kOSThermalMitigationThermalTableReady], &tableReady);
	109
	110	// If we are ready then optimize this so we don't call dispatch everytime.
	111	if (tableReady == kOSThermalMitigationCount) {
	112	thermalLevelsReady = true;
	113	return _OSThermalNotificationLevelForBehavior(kOSThermalMitigationNone);
	114	}
	115	else {
	116	// Allow reset so we can dynamically change the table without thermal trap screen appearing.
	117	thermalLevelsReady = false;
	118	}
	119
	120	// Not ready returns -1, which should not be equal or greater than any other thermal state.
	121	return OSThermalNotificationLevelAny;
	122	}
	123
	124	#endif // TARGET_OS_IPHONE