1/* 2 * Copyright (c) 1998-2002 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * The contents of this file constitute Original Code as defined in and 7 * are subject to the Apple Public Source License Version 1.1 (the 8 * "License"). You may not use this file except in compliance with the 9 * License. Please obtain a copy of the License at 10 * http://www.apple.com/publicsource and read it before using this file. 11 * 12 * This Original Code and all software distributed under the License are 13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER 14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the 17 * License for the specific language governing rights and limitations 18 * under the License. 19 * 20 * @APPLE_LICENSE_HEADER_END@ 21 */ 22 23// public 24#include <IOKit/firewire/IOFireWirePowerManager.h> 25// protected 26#include <IOKit/firewire/IOFireWireController.h> 27 28// private 29#import "FWDebugging.h" 30 31OSDefineMetaClassAndStructors(IOFireWirePowerManager, OSObject) 32OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 0); 33OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 1); 34OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 2); 35OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 3); 36OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 4); 37OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 5); 38OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 6); 39OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 7); 40OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 8); 41OSMetaClassDefineReservedUnused(IOFireWirePowerManager, 9); 42 43#pragma mark - 44 45///////////////////////////////////////////////////////////////////////////// 46 47// createWithController 48// 49// 50 51IOFireWirePowerManager * IOFireWirePowerManager::createWithController( IOFireWireController * controller ) 52{ 53 IOFireWirePowerManager * me = OSTypeAlloc( IOFireWirePowerManager ); 54 if( me != NULL ) 55 { 56 if( !me->initWithController(controller) ) 57 { 58 me->release(); 59 me = NULL; 60 } 61 } 62 63 return me; 64} 65 66// initWithController 67// 68// 69 70bool IOFireWirePowerManager::initWithController( IOFireWireController * controller ) 71{ 72 bool success = true; // assume success 73 74 // init super 75 76 if( !OSObject::init() ) 77 success = false; 78 79 if( success ) 80 { 81 fControl = controller; 82 fMaximumDeciwatts = 0; 83 fAllocatedDeciwatts = 0; 84 } 85 86 return success; 87} 88 89#pragma mark - 90 91///////////////////////////////////////////////////////////////////////////// 92 93// setMaximumDeciwatts 94// 95// 96 97void IOFireWirePowerManager::setMaximumDeciwatts( UInt32 deciwatts ) 98{ 99 FWKLOG(( "IOFireWirePowerManager::setMaximumDeciwatts - setting maximum milliwats to %d\n", deciwatts )); 100 101 fMaximumDeciwatts = deciwatts; 102} 103 104// allocateDeciwatts 105// 106// 107 108IOReturn IOFireWirePowerManager::allocateDeciwatts( UInt32 deciwatts ) 109{ 110 IOReturn status = kIOReturnSuccess; 111 112 fControl->closeGate(); 113 114 FWKLOG(( "IOFireWirePowerManager::allocateDeciwatts - allocating %d deciwatts\n", deciwatts )); 115 116 if( fAllocatedDeciwatts + deciwatts <= fMaximumDeciwatts ) 117 { 118 fAllocatedDeciwatts += deciwatts; 119 } 120 else 121 { 122 status = kIOReturnNoResources; 123 } 124 125 fControl->openGate(); 126 127 return status; 128} 129 130// deallocateDeciwatts 131// 132// 133 134void IOFireWirePowerManager::deallocateDeciwatts( UInt32 deciwatts ) 135{ 136 fControl->closeGate(); 137 138 FWKLOG(( "IOFireWirePowerManager::deallocateDeciwatts - freeing %d deciwatts\n", deciwatts )); 139 140 if( deciwatts <= fAllocatedDeciwatts ) 141 { 142 fAllocatedDeciwatts -= deciwatts; 143 } 144 else 145 { 146 IOLog( "IOFireWirePowerManager::deallocateDeciwatts - freed deciwatts %d > allocated deciwatts %d!\n", (uint32_t)deciwatts, (uint32_t)fAllocatedDeciwatts ); 147 fAllocatedDeciwatts = 0; 148 } 149 150 // notify clients that more power has been made available 151 if( deciwatts != 0 ) 152 { 153 fControl->messageClients( kIOFWMessagePowerStateChanged ); 154 } 155 156 fControl->openGate(); 157} 158