[ALSA] seq-midi - silently ignore non-MIDI events
[linux-2.6] / sound / core / sound_oss.c
1 /*
2  *  Advanced Linux Sound Architecture
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4  *
5  *
6  *   This program is free software; you can redistribute it and/or modify
7  *   it under the terms of the GNU General Public License as published by
8  *   the Free Software Foundation; either version 2 of the License, or
9  *   (at your option) any later version.
10  *
11  *   This program is distributed in the hope that it will be useful,
12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *   GNU General Public License for more details.
15  *
16  *   You should have received a copy of the GNU General Public License
17  *   along with this program; if not, write to the Free Software
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  *
20  */
21
22 #include <sound/driver.h>
23
24 #ifdef CONFIG_SND_OSSEMUL
25
26 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
27 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
28 #endif
29
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/time.h>
33 #include <sound/core.h>
34 #include <sound/minors.h>
35 #include <sound/info.h>
36 #include <linux/sound.h>
37
38 #define SNDRV_OS_MINORS         256
39
40 static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
41
42 static DECLARE_MUTEX(sound_oss_mutex);
43
44 static snd_minor_t *snd_oss_minor_search(int minor)
45 {
46         struct list_head *list;
47         snd_minor_t *mptr;
48
49         list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
50                 mptr = list_entry(list, snd_minor_t, list);
51                 if (mptr->number == minor)
52                         return mptr;
53         }
54         return NULL;
55 }
56
57 static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
58 {
59         int minor;
60
61         switch (type) {
62         case SNDRV_OSS_DEVICE_TYPE_MIXER:
63                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
64                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
65                 break;
66         case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
67                 minor = SNDRV_MINOR_OSS_SEQUENCER;
68                 break;
69         case SNDRV_OSS_DEVICE_TYPE_MUSIC:
70                 minor = SNDRV_MINOR_OSS_MUSIC;
71                 break;
72         case SNDRV_OSS_DEVICE_TYPE_PCM:
73                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
74                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
75                 break;
76         case SNDRV_OSS_DEVICE_TYPE_MIDI:
77                 snd_assert(card != NULL && dev <= 1, return -EINVAL);
78                 minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
79                 break;
80         case SNDRV_OSS_DEVICE_TYPE_DMFM:
81                 minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
82                 break;
83         case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
84                 minor = SNDRV_MINOR_OSS_SNDSTAT;
85                 break;
86         default:
87                 return -EINVAL;
88         }
89         snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
90         return minor;
91 }
92
93 int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
94 {
95         int minor = snd_oss_kernel_minor(type, card, dev);
96         int minor_unit;
97         snd_minor_t *preg;
98         int cidx = SNDRV_MINOR_OSS_CARD(minor);
99         int track2 = -1;
100         int register1 = -1, register2 = -1;
101
102         if (minor < 0)
103                 return minor;
104         preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
105         if (preg == NULL)
106                 return -ENOMEM;
107         *preg = *reg;
108         preg->number = minor;
109         preg->device = dev;
110         down(&sound_oss_mutex);
111         list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
112         minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
113         switch (minor_unit) {
114         case SNDRV_MINOR_OSS_PCM:
115                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
116                 break;
117         case SNDRV_MINOR_OSS_MIDI:
118                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
119                 break;
120         case SNDRV_MINOR_OSS_MIDI1:
121                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
122                 break;
123         }
124         register1 = register_sound_special(reg->f_ops, minor);
125         if (register1 != minor)
126                 goto __end;
127         if (track2 >= 0) {
128                 register2 = register_sound_special(reg->f_ops, track2);
129                 if (register2 != track2)
130                         goto __end;
131         }
132         up(&sound_oss_mutex);
133         return 0;
134
135       __end:
136         if (register2 >= 0)
137                 unregister_sound_special(register2);
138         if (register1 >= 0)
139                 unregister_sound_special(register1);
140         list_del(&preg->list);
141         up(&sound_oss_mutex);
142         kfree(preg);
143         return -EBUSY;
144 }
145
146 int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
147 {
148         int minor = snd_oss_kernel_minor(type, card, dev);
149         int cidx = SNDRV_MINOR_OSS_CARD(minor);
150         int track2 = -1;
151         snd_minor_t *mptr;
152
153         if (minor < 0)
154                 return minor;
155         down(&sound_oss_mutex);
156         mptr = snd_oss_minor_search(minor);
157         if (mptr == NULL) {
158                 up(&sound_oss_mutex);
159                 return -ENOENT;
160         }
161         unregister_sound_special(minor);
162         switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
163         case SNDRV_MINOR_OSS_PCM:
164                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
165                 break;
166         case SNDRV_MINOR_OSS_MIDI:
167                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
168                 break;
169         case SNDRV_MINOR_OSS_MIDI1:
170                 track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
171                 break;
172         }
173         if (track2 >= 0)
174                 unregister_sound_special(track2);
175         list_del(&mptr->list);
176         up(&sound_oss_mutex);
177         kfree(mptr);
178         return 0;
179 }
180
181 /*
182  *  INFO PART
183  */
184
185 #ifdef CONFIG_PROC_FS
186
187 static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
188
189 static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
190 {
191         int card, dev;
192         struct list_head *list;
193         snd_minor_t *mptr;
194
195         down(&sound_oss_mutex);
196         for (card = 0; card < SNDRV_CARDS; card++) {
197                 list_for_each(list, &snd_oss_minors_hash[card]) {
198                         mptr = list_entry(list, snd_minor_t, list);
199                         dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
200                         if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
201                             dev != SNDRV_MINOR_OSS_SEQUENCER &&
202                             dev != SNDRV_MINOR_OSS_MUSIC)
203                                 snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
204                         else
205                                 snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
206                 }
207         }
208         up(&sound_oss_mutex);
209 }
210
211 #endif /* CONFIG_PROC_FS */
212
213 int __init snd_minor_info_oss_init(void)
214 {
215 #ifdef CONFIG_PROC_FS
216         snd_info_entry_t *entry;
217
218         entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
219         if (entry) {
220                 entry->c.text.read_size = PAGE_SIZE;
221                 entry->c.text.read = snd_minor_info_oss_read;
222                 if (snd_info_register(entry) < 0) {
223                         snd_info_free_entry(entry);
224                         entry = NULL;
225                 }
226         }
227         snd_minor_info_oss_entry = entry;
228 #endif
229         return 0;
230 }
231
232 int __exit snd_minor_info_oss_done(void)
233 {
234 #ifdef CONFIG_PROC_FS
235         if (snd_minor_info_oss_entry)
236                 snd_info_unregister(snd_minor_info_oss_entry);
237 #endif
238         return 0;
239 }
240
241 int __init snd_oss_init_module(void)
242 {
243         int card;
244         
245         for (card = 0; card < SNDRV_CARDS; card++)
246                 INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
247         return 0;
248 }
249
250 #endif /* CONFIG_SND_OSSEMUL */