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3fedd148 DK |
1 | /** |
2 | * @file me_slist.c | |
3 | * | |
4 | * @brief Implements the subdevice list class. | |
5 | * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de) | |
6 | * @author Guenter Gebhardt | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de) | |
11 | * | |
12 | * This file is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
27 | #include "meerror.h" | |
28 | #include "medefines.h" | |
29 | ||
30 | #include "meslist.h" | |
31 | #include "medebug.h" | |
32 | ||
33 | int me_slist_query_number_subdevices(struct me_slist *slist, int *number) | |
34 | { | |
35 | PDEBUG_LOCKS("called.\n"); | |
36 | *number = slist->n; | |
37 | return ME_ERRNO_SUCCESS; | |
38 | } | |
39 | ||
40 | unsigned int me_slist_get_number_subdevices(struct me_slist *slist) | |
41 | { | |
42 | PDEBUG_LOCKS("called.\n"); | |
43 | return slist->n; | |
44 | } | |
45 | ||
46 | me_subdevice_t *me_slist_get_subdevice(struct me_slist * slist, | |
47 | unsigned int index) | |
48 | { | |
49 | ||
50 | struct list_head *pos; | |
51 | me_subdevice_t *subdevice = NULL; | |
52 | unsigned int i = 0; | |
53 | ||
54 | PDEBUG_LOCKS("called.\n"); | |
55 | ||
56 | if (index >= slist->n) { | |
57 | PERROR("Index out of range.\n"); | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | list_for_each(pos, &slist->head) { | |
62 | if (i == index) { | |
63 | subdevice = list_entry(pos, me_subdevice_t, list); | |
64 | break; | |
65 | } | |
66 | ||
67 | ++i; | |
68 | } | |
69 | ||
70 | return subdevice; | |
71 | } | |
72 | ||
73 | int me_slist_get_subdevice_by_type(struct me_slist *slist, | |
74 | unsigned int start_subdevice, | |
75 | int type, int subtype, int *subdevice) | |
76 | { | |
77 | me_subdevice_t *pos; | |
78 | int s_type, s_subtype; | |
79 | unsigned int index = 0; | |
80 | ||
81 | PDEBUG_LOCKS("called.\n"); | |
82 | ||
83 | if (start_subdevice >= slist->n) { | |
84 | PERROR("Start index out of range.\n"); | |
85 | return ME_ERRNO_NOMORE_SUBDEVICE_TYPE; | |
86 | } | |
87 | ||
88 | list_for_each_entry(pos, &slist->head, list) { | |
89 | if (index < start_subdevice) { // Go forward to start subdevice. | |
90 | ++index; | |
91 | continue; | |
92 | } | |
93 | ||
94 | pos->me_subdevice_query_subdevice_type(pos, | |
95 | &s_type, &s_subtype); | |
96 | ||
97 | if (subtype == ME_SUBTYPE_ANY) { | |
98 | if (s_type == type) | |
99 | break; | |
100 | } else { | |
101 | if ((s_type == type) && (s_subtype == subtype)) | |
102 | break; | |
103 | } | |
104 | ||
105 | ++index; | |
106 | } | |
107 | ||
108 | if (index >= slist->n) { | |
109 | return ME_ERRNO_NOMORE_SUBDEVICE_TYPE; | |
110 | } | |
111 | ||
112 | *subdevice = index; | |
113 | ||
114 | return ME_ERRNO_SUCCESS; | |
115 | } | |
116 | ||
117 | void me_slist_add_subdevice_tail(struct me_slist *slist, | |
451084d2 | 118 | me_subdevice_t *subdevice) |
3fedd148 DK |
119 | { |
120 | PDEBUG_LOCKS("called.\n"); | |
121 | ||
122 | list_add_tail(&subdevice->list, &slist->head); | |
123 | ++slist->n; | |
124 | } | |
125 | ||
126 | me_subdevice_t *me_slist_del_subdevice_tail(struct me_slist *slist) | |
127 | { | |
128 | ||
129 | struct list_head *last; | |
130 | me_subdevice_t *subdevice; | |
131 | ||
132 | PDEBUG_LOCKS("called.\n"); | |
133 | ||
134 | if (list_empty(&slist->head)) | |
135 | return NULL; | |
136 | ||
137 | last = slist->head.prev; | |
138 | ||
139 | subdevice = list_entry(last, me_subdevice_t, list); | |
140 | ||
141 | list_del(last); | |
142 | ||
143 | --slist->n; | |
144 | ||
145 | return subdevice; | |
146 | } | |
147 | ||
451084d2 | 148 | int me_slist_init(me_slist_t *slist) |
3fedd148 DK |
149 | { |
150 | PDEBUG_LOCKS("called.\n"); | |
151 | ||
152 | INIT_LIST_HEAD(&slist->head); | |
153 | slist->n = 0; | |
154 | return 0; | |
155 | } | |
156 | ||
451084d2 | 157 | void me_slist_deinit(me_slist_t *slist) |
3fedd148 DK |
158 | { |
159 | ||
160 | struct list_head *s; | |
161 | me_subdevice_t *subdevice; | |
162 | ||
163 | PDEBUG_LOCKS("called.\n"); | |
164 | ||
165 | while (!list_empty(&slist->head)) { | |
166 | s = slist->head.next; | |
167 | list_del(s); | |
168 | subdevice = list_entry(s, me_subdevice_t, list); | |
169 | subdevice->me_subdevice_destructor(subdevice); | |
170 | } | |
171 | ||
172 | slist->n = 0; | |
173 | } |