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     nextPowerSource = firstItem;                                // Is new object already in the list?
  56     while (  nextPowerSource != NULL ) {
  57         if ( nextPowerSource == newPowerSource ) {
  58             return IOPMNoErr;                           // yes, just return
  59         }
  60         nextPowerSource = nextInList(nextPowerSource);
  61     }
  62     newPowerSource->nextInList = firstItem;             // add it to list
  63     firstItem = newPowerSource;
  64     length += 1;
  65     return IOPMNoErr;
  66 }
  67
  68
  69 //*********************************************************************************
  70 // firstInList
  71 //
  72 //*********************************************************************************
  73
  74 IOPMPowerSource * IOPMPowerSourceList::firstInList ( void )
  75 {
  76     return firstItem;
  77 }
  78
  79 //*********************************************************************************
  80 // nextInList
  81 //
  82 //*********************************************************************************
  83
  84 IOPMPowerSource * IOPMPowerSourceList::nextInList ( IOPMPowerSource * currentItem )
  85 {
  86     if ( currentItem != NULL ) {
  87        return (currentItem->nextInList);
  88     }
  89     return NULL;
  90 }
  91
  92 //*********************************************************************************
  93 // numberOfItems
  94 //
  95 //*********************************************************************************
  96
  97 unsigned long IOPMPowerSourceList::numberOfItems ( void )
  98 {
  99     return length;
 100 }
 101
 102 //*********************************************************************************
 103 // removeFromList
 104 //
 105 // Find the item in the list, unlink it, and free it.
 106 //*********************************************************************************
 107
 108 IOReturn IOPMPowerSourceList::removeFromList ( IOPMPowerSource * theItem )
 109 {
 110     IOPMPowerSource * item = firstItem;
 111     IOPMPowerSource * temp;
 112
 113     if ( item != NULL ) {
 114         if ( item  == theItem ) {
 115             firstItem = item->nextInList;
 116             length--;
 117             item->release();
 118             return IOPMNoErr;
 119         }
 120         while ( item->nextInList != NULL ) {
 121             if ( item->nextInList == theItem ) {
 122                 temp = item->nextInList;
 123                 item->nextInList = temp->nextInList;
 124                 length--;
 125                 temp->release();
 126                 return IOPMNoErr;
 127             }
 128             item = item->nextInList;
 129         }
 130     }
 131     return IOPMNoErr;
 132 }
 133
 134
 135 //*********************************************************************************
 136 // free
 137 //
 138 // Free all items in the list, and then free the list itself
 139 //*********************************************************************************
 140
 141 void IOPMPowerSourceList::free (void )
 142 {
 143     IOPMPowerSource * next = firstItem;
 144
 145     while ( next != NULL ) {
 146         firstItem = next->nextInList;
 147         length--;
 148         next->release();
 149         next = firstItem;
 150     }
 151 super::free();
 152 }
 153
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