iokit/Kernel/IOPMPowerSourceList.cpp

   1 /*
   2  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 #include <IOKit/pwr_mgt/IOPM.h>
  31 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  32 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  33
  34 #define super OSObject
  35 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  36
  37 //******************************************************************************
  38 // init
  39 //
  40 //******************************************************************************
  41 void IOPMPowerSourceList::initialize ( void )
  42 {
  43     firstItem = NULL;
  44     length = 0;
  45 }
  46
  47 //******************************************************************************
  48 // addToList
  49 //
  50 //******************************************************************************
  51
  52 IOReturn IOPMPowerSourceList::addToList(IOPMPowerSource *newPowerSource)
  53 {
  54     IOPMPowerSource * nextPowerSource;
  55
  56     // Is new object already in the list?
  57     nextPowerSource = firstItem;
  58     while (  nextPowerSource != NULL )
  59     {
  60         if ( nextPowerSource == newPowerSource )
  61         {
  62             // yes, just return
  63             return IOPMNoErr;
  64         }
  65         nextPowerSource = nextInList(nextPowerSource);
  66     }
  67
  68     // add it to list
  69     newPowerSource->nextInList = firstItem;
  70     firstItem = newPowerSource;
  71     length++;
  72     return IOPMNoErr;
  73 }
  74
  75
  76 //******************************************************************************
  77 // firstInList
  78 //
  79 //******************************************************************************
  80
  81 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  82 {
  83     return firstItem;
  84 }
  85
  86 //******************************************************************************
  87 // nextInList
  88 //
  89 //******************************************************************************
  90
  91 IOPMPowerSource * IOPMPowerSourceList::nextInList(IOPMPowerSource *currentItem)
  92 {
  93     if ( currentItem != NULL ) {
  94        return (currentItem->nextInList);
  95     }
  96     return NULL;
  97 }
  98
  99 //******************************************************************************
 100 // numberOfItems
 101 //
 102 //******************************************************************************
 103
 104 unsigned long IOPMPowerSourceList::numberOfItems ( void )
 105 {
 106     return length;
 107 }
 108
 109 //******************************************************************************
 110 // removeFromList
 111 //
 112 // Find the item in the list, unlink it, and free it.
 113 //******************************************************************************
 114
 115 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 116 {
 117     IOPMPowerSource * item = firstItem;
 118     IOPMPowerSource * temp;
 119
 120     if ( NULL == item) goto exit;
 121
 122     if ( item  == theItem ) {
 123         firstItem = item->nextInList;
 124         length--;
 125         item->release();
 126         return IOPMNoErr;
 127     }
 128     while ( item->nextInList != NULL ) {
 129         if ( item->nextInList == theItem ) {
 130             temp = item->nextInList;
 131             item->nextInList = temp->nextInList;
 132             length--;
 133             temp->release();
 134             return IOPMNoErr;
 135         }
 136         item = item->nextInList;
 137     }
 138
 139 exit:
 140     return IOPMNoErr;
 141 }
 142
 143
 144 //******************************************************************************
 145 // free
 146 //
 147 // Free all items in the list, and then free the list itself
 148 //******************************************************************************
 149
 150 void IOPMPowerSourceList::free (void )
 151 {
 152     IOPMPowerSource * next = firstItem;
 153
 154     while ( next != NULL ) {
 155         firstItem = next->nextInList;
 156         length--;
 157         next->release();
 158         next = firstItem;
 159     }
 160     super::free();
 161 }
 162
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