iokit/Kernel/IOPMPowerSourceList.cpp

   1 /*
   2  * Copyright (c) 1998-2000 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 #include <stddef.h>
  23 #include <IOKit/pwr_mgt/IOPM.h>
  24 #include <IOKit/pwr_mgt/IOPMPowerSourceList.h>
  25 #include <IOKit/pwr_mgt/IOPMPowerSource.h>
  26
  27 #define super OSObject
  28 OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)
  29
  30 //*********************************************************************************
  31 // init
  32 //
  33 //*********************************************************************************
  34 void IOPMPowerSourceList::initialize ( void )
  35 {
  36     firstItem = NULL;
  37     length = 0;
  38 }
  39
  40 //*********************************************************************************
  41 // addToList
  42 //
  43 //*********************************************************************************
  44
  45 IOReturn IOPMPowerSourceList::addToList ( IOPMPowerSource * newPowerSource )
  46 {
  47     IOPMPowerSource * nextPowerSource;
  48     nextPowerSource = firstItem;                                // Is new object already in the list?
  49     while (  nextPowerSource != NULL ) {
  50         if ( nextPowerSource == newPowerSource ) {
  51             return IOPMNoErr;                           // yes, just return
  52         }
  53         nextPowerSource = nextInList(nextPowerSource);
  54     }
  55     newPowerSource->nextInList = firstItem;             // add it to list
  56     firstItem = newPowerSource;
  57     length += 1;
  58     return IOPMNoErr;
  59 }
  60
  61
  62 //*********************************************************************************
  63 // firstInList
  64 //
  65 //*********************************************************************************
  66
  67 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  68 {
  69     return firstItem;
  70 }
  71
  72 //*********************************************************************************
  73 // nextInList
  74 //
  75 //*********************************************************************************
  76
  77 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
  78 {
  79     if ( currentItem != NULL ) {
  80        return (currentItem->nextInList);
  81     }
  82     return NULL;
  83 }
  84
  85 //*********************************************************************************
  86 // numberOfItems
  87 //
  88 //*********************************************************************************
  89
  90 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  91 {
  92     return length;
  93 }
  94
  95 //*********************************************************************************
  96 // removeFromList
  97 //
  98 // Find the item in the list, unlink it, and free it.
  99 //*********************************************************************************
 100
 101 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 102 {
 103     IOPMPowerSource * item = firstItem;
 104     IOPMPowerSource * temp;
 105
 106     if ( item != NULL ) {
 107         if ( item  == theItem ) {
 108             firstItem = item->nextInList;
 109             length--;
 110             item->release();
 111             return IOPMNoErr;
 112         }
 113         while ( item->nextInList != NULL ) {
 114             if ( item->nextInList == theItem ) {
 115                 temp = item->nextInList;
 116                 item->nextInList = temp->nextInList;
 117                 length--;
 118                 temp->release();
 119                 return IOPMNoErr;
 120             }
 121             item = item->nextInList;
 122         }
 123     }
 124     return IOPMNoErr;
 125 }
 126
 127
 128 //*********************************************************************************
 129 // free
 130 //
 131 // Free all items in the list, and then free the list itself
 132 //*********************************************************************************
 133
 134 void IOPMPowerSourceList::free (void )
 135 {
 136     IOPMPowerSource * next = firstItem;
 137
 138     while ( next != NULL ) {
 139         firstItem = next->nextInList;
 140         length--;
 141         next->release();
 142         next = firstItem;
 143     }
 144 super::free();
 145 }
 146
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