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
  54     // Is new object already in the list?
  55     nextPowerSource = firstItem;
  56     while (  nextPowerSource != NULL )
  57     {
  58         if ( nextPowerSource == newPowerSource )
  59         {
  60             // yes, just return
  61             return IOPMNoErr;
  62         }
  63         nextPowerSource = nextInList(nextPowerSource);
  64     }
  65
  66     // add it to list
  67     newPowerSource->nextInList = firstItem;
  68     firstItem = newPowerSource;
  69     length++;
  70     return IOPMNoErr;
  71 }
  72
  73
  74 //******************************************************************************
  75 // firstInList
  76 //
  77 //******************************************************************************
  78
  79 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  80 {
  81     return firstItem;
  82 }
  83
  84 //******************************************************************************
  85 // nextInList
  86 //
  87 //******************************************************************************
  88
  89 IOPMPowerSource * IOPMPowerSourceList::nextInList(IOPMPowerSource *currentItem)
  90 {
  91     if ( currentItem != NULL ) {
  92        return (currentItem->nextInList);
  93     }
  94     return NULL;
  95 }
  96
  97 //******************************************************************************
  98 // numberOfItems
  99 //
 100 //******************************************************************************
 101
 102 unsigned long IOPMPowerSourceList::numberOfItems ( void )
 103 {
 104     return length;
 105 }
 106
 107 //******************************************************************************
 108 // removeFromList
 109 //
 110 // Find the item in the list, unlink it, and free it.
 111 //******************************************************************************
 112
 113 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 114 {
 115     IOPMPowerSource * item = firstItem;
 116     IOPMPowerSource * temp;
 117
 118     if ( NULL == item) goto exit;
 119
 120     if ( item  == theItem ) {
 121         firstItem = item->nextInList;
 122         length--;
 123         item->release();
 124         return IOPMNoErr;
 125     }
 126     while ( item->nextInList != NULL ) {
 127         if ( item->nextInList == theItem ) {
 128             temp = item->nextInList;
 129             item->nextInList = temp->nextInList;
 130             length--;
 131             temp->release();
 132             return IOPMNoErr;
 133         }
 134         item = item->nextInList;
 135     }
 136
 137 exit:
 138     return IOPMNoErr;
 139 }
 140
 141
 142 //******************************************************************************
 143 // free
 144 //
 145 // Free all items in the list, and then free the list itself
 146 //******************************************************************************
 147
 148 void IOPMPowerSourceList::free (void )
 149 {
 150     IOPMPowerSource * next = firstItem;
 151
 152     while ( next != NULL ) {
 153         firstItem = next->nextInList;
 154         length--;
 155         next->release();
 156         next = firstItem;
 157     }
 158     super::free();
 159 }
 160
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