iokit/Kernel/IOPMPowerSourceList.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <IOKit/pwr_mgt/IOPM.h>
  29 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  30 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  31
  32 #define super OSObject
  33 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  34
  35 //*********************************************************************************
  36 // init
  37 //
  38 //*********************************************************************************
  39 void IOPMPowerSourceList::initialize ( void )
  40 {
  41     firstItem = NULL;
  42     length = 0;
  43 }
  44
  45 //*********************************************************************************
  46 // addToList
  47 //
  48 //*********************************************************************************
  49
  50 IOReturn IOPMPowerSourceList::addToList ( IOPMPowerSource * newPowerSource )
  51 {
  52     IOPMPowerSource * nextPowerSource;
  53     nextPowerSource = firstItem;                                // Is new object already in the list?
  54     while (  nextPowerSource != NULL ) {
  55         if ( nextPowerSource == newPowerSource ) {
  56             return IOPMNoErr;                           // yes, just return
  57         }
  58         nextPowerSource = nextInList(nextPowerSource);
  59     }
  60     newPowerSource->nextInList = firstItem;             // add it to list
  61     firstItem = newPowerSource;
  62     length += 1;
  63     return IOPMNoErr;
  64 }
  65
  66
  67 //*********************************************************************************
  68 // firstInList
  69 //
  70 //*********************************************************************************
  71
  72 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  73 {
  74     return firstItem;
  75 }
  76
  77 //*********************************************************************************
  78 // nextInList
  79 //
  80 //*********************************************************************************
  81
  82 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
  83 {
  84     if ( currentItem != NULL ) {
  85        return (currentItem->nextInList);
  86     }
  87     return NULL;
  88 }
  89
  90 //*********************************************************************************
  91 // numberOfItems
  92 //
  93 //*********************************************************************************
  94
  95 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  96 {
  97     return length;
  98 }
  99
 100 //*********************************************************************************
 101 // removeFromList
 102 //
 103 // Find the item in the list, unlink it, and free it.
 104 //*********************************************************************************
 105
 106 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 107 {
 108     IOPMPowerSource * item = firstItem;
 109     IOPMPowerSource * temp;
 110
 111     if ( item != NULL ) {
 112         if ( item  == theItem ) {
 113             firstItem = item->nextInList;
 114             length--;
 115             item->release();
 116             return IOPMNoErr;
 117         }
 118         while ( item->nextInList != NULL ) {
 119             if ( item->nextInList == theItem ) {
 120                 temp = item->nextInList;
 121                 item->nextInList = temp->nextInList;
 122                 length--;
 123                 temp->release();
 124                 return IOPMNoErr;
 125             }
 126             item = item->nextInList;
 127         }
 128     }
 129     return IOPMNoErr;
 130 }
 131
 132
 133 //*********************************************************************************
 134 // free
 135 //
 136 // Free all items in the list, and then free the list itself
 137 //*********************************************************************************
 138
 139 void IOPMPowerSourceList::free (void )
 140 {
 141     IOPMPowerSource * next = firstItem;
 142
 143     while ( next != NULL ) {
 144         firstItem = next->nextInList;
 145         length--;
 146         next->release();
 147         next = firstItem;
 148     }
 149 super::free();
 150 }
 151
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