iokit/Kernel/IOPMPowerSourceList.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 #include <IOKit/pwr_mgt/IOPM.h>
  26 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  27 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  28
  29 #define super OSObject
  30 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  31
  32 //*********************************************************************************
  33 // init
  34 //
  35 //*********************************************************************************
  36 void IOPMPowerSourceList::initialize ( void )
  37 {
  38     firstItem = NULL;
  39     length = 0;
  40 }
  41
  42 //*********************************************************************************
  43 // addToList
  44 //
  45 //*********************************************************************************
  46
  47 IOReturn IOPMPowerSourceList::addToList ( IOPMPowerSource * newPowerSource )
  48 {
  49     IOPMPowerSource * nextPowerSource;
  50     nextPowerSource = firstItem;                                // Is new object already in the list?
  51     while (  nextPowerSource != NULL ) {
  52         if ( nextPowerSource == newPowerSource ) {
  53             return IOPMNoErr;                           // yes, just return
  54         }
  55         nextPowerSource = nextInList(nextPowerSource);
  56     }
  57     newPowerSource->nextInList = firstItem;             // add it to list
  58     firstItem = newPowerSource;
  59     length += 1;
  60     return IOPMNoErr;
  61 }
  62
  63
  64 //*********************************************************************************
  65 // firstInList
  66 //
  67 //*********************************************************************************
  68
  69 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  70 {
  71     return firstItem;
  72 }
  73
  74 //*********************************************************************************
  75 // nextInList
  76 //
  77 //*********************************************************************************
  78
  79 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
  80 {
  81     if ( currentItem != NULL ) {
  82        return (currentItem->nextInList);
  83     }
  84     return NULL;
  85 }
  86
  87 //*********************************************************************************
  88 // numberOfItems
  89 //
  90 //*********************************************************************************
  91
  92 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  93 {
  94     return length;
  95 }
  96
  97 //*********************************************************************************
  98 // removeFromList
  99 //
 100 // Find the item in the list, unlink it, and free it.
 101 //*********************************************************************************
 102
 103 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 104 {
 105     IOPMPowerSource * item = firstItem;
 106     IOPMPowerSource * temp;
 107
 108     if ( item != NULL ) {
 109         if ( item  == theItem ) {
 110             firstItem = item->nextInList;
 111             length--;
 112             item->release();
 113             return IOPMNoErr;
 114         }
 115         while ( item->nextInList != NULL ) {
 116             if ( item->nextInList == theItem ) {
 117                 temp = item->nextInList;
 118                 item->nextInList = temp->nextInList;
 119                 length--;
 120                 temp->release();
 121                 return IOPMNoErr;
 122             }
 123             item = item->nextInList;
 124         }
 125     }
 126     return IOPMNoErr;
 127 }
 128
 129
 130 //*********************************************************************************
 131 // free
 132 //
 133 // Free all items in the list, and then free the list itself
 134 //*********************************************************************************
 135
 136 void IOPMPowerSourceList::free (void )
 137 {
 138     IOPMPowerSource * next = firstItem;
 139
 140     while ( next != NULL ) {
 141         firstItem = next->nextInList;
 142         length--;
 143         next->release();
 144         next = firstItem;
 145     }
 146 super::free();
 147 }
 148
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