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
OSDefineMetaClassAndStructors(IOPMPowerSourceList,OSObject)33 OSDefineMetaClassAndStructors(IOPMPowerSourceList, OSObject)
34
35 //******************************************************************************
36 // init
37 //
38 //******************************************************************************
39 void
40 IOPMPowerSourceList::initialize( void )
41 {
42 firstItem = NULL;
43 length = 0;
44 }
45
46 //******************************************************************************
47 // addToList
48 //
49 //******************************************************************************
50
51 IOReturn
addToList(IOPMPowerSource * newPowerSource)52 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 if (nextPowerSource == newPowerSource) {
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 *
firstInList(void)80 IOPMPowerSourceList::firstInList( void )
81 {
82 return firstItem;
83 }
84
85 //******************************************************************************
86 // nextInList
87 //
88 //******************************************************************************
89
90 IOPMPowerSource *
nextInList(IOPMPowerSource * currentItem)91 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
numberOfItems(void)105 IOPMPowerSourceList::numberOfItems( void )
106 {
107 return length;
108 }
109
110 //******************************************************************************
111 // removeFromList
112 //
113 // Find the item in the list, unlink it, and free it.
114 //******************************************************************************
115
116 IOReturn
removeFromList(IOPMPowerSource * theItem)117 IOPMPowerSourceList::removeFromList( IOPMPowerSource * theItem )
118 {
119 IOPMPowerSource * item = firstItem;
120 IOPMPowerSource * temp;
121
122 if (NULL == item) {
123 goto exit;
124 }
125
126 if (item == theItem) {
127 firstItem = item->nextInList;
128 length--;
129 item->release();
130 return IOPMNoErr;
131 }
132 while (item->nextInList != NULL) {
133 if (item->nextInList == theItem) {
134 temp = item->nextInList;
135 item->nextInList = temp->nextInList;
136 length--;
137 temp->release();
138 return IOPMNoErr;
139 }
140 item = item->nextInList;
141 }
142
143 exit:
144 return IOPMNoErr;
145 }
146
147
148 //******************************************************************************
149 // free
150 //
151 // Free all items in the list, and then free the list itself
152 //******************************************************************************
153
154 void
free(void)155 IOPMPowerSourceList::free(void )
156 {
157 IOPMPowerSource * next = firstItem;
158
159 while (next != NULL) {
160 firstItem = next->nextInList;
161 length--;
162 next->release();
163 next = firstItem;
164 }
165 super::free();
166 }
167