Root/include/sound/seq_device.h

1#ifndef __SOUND_SEQ_DEVICE_H
2#define __SOUND_SEQ_DEVICE_H
3
4/*
5 * ALSA sequencer device management
6 * Copyright (c) 1999 by Takashi Iwai <tiwai@suse.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24/*
25 * registered device information
26 */
27
28#define ID_LEN 32
29
30/* status flag */
31#define SNDRV_SEQ_DEVICE_FREE 0
32#define SNDRV_SEQ_DEVICE_REGISTERED 1
33
34struct snd_seq_device {
35    /* device info */
36    struct snd_card *card; /* sound card */
37    int device; /* device number */
38    char id[ID_LEN]; /* driver id */
39    char name[80]; /* device name */
40    int argsize; /* size of the argument */
41    void *driver_data; /* private data for driver */
42    int status; /* flag - read only */
43    void *private_data; /* private data for the caller */
44    void (*private_free)(struct snd_seq_device *device);
45    struct list_head list; /* link to next device */
46};
47
48
49/* driver operators
50 * init_device:
51 * Initialize the device with given parameters.
52 * Typically,
53 * 1. call snd_hwdep_new
54 * 2. allocate private data and initialize it
55 * 3. call snd_hwdep_register
56 * 4. store the instance to dev->driver_data pointer.
57 *
58 * free_device:
59 * Release the private data.
60 * Typically, call snd_device_free(dev->card, dev->driver_data)
61 */
62struct snd_seq_dev_ops {
63    int (*init_device)(struct snd_seq_device *dev);
64    int (*free_device)(struct snd_seq_device *dev);
65};
66
67/*
68 * prototypes
69 */
70void snd_seq_device_load_drivers(void);
71int snd_seq_device_new(struct snd_card *card, int device, char *id, int argsize, struct snd_seq_device **result);
72int snd_seq_device_register_driver(char *id, struct snd_seq_dev_ops *entry, int argsize);
73int snd_seq_device_unregister_driver(char *id);
74
75#define SNDRV_SEQ_DEVICE_ARGPTR(dev) (void *)((char *)(dev) + sizeof(struct snd_seq_device))
76
77
78/*
79 * id strings for generic devices
80 */
81#define SNDRV_SEQ_DEV_ID_MIDISYNTH "seq-midi"
82#define SNDRV_SEQ_DEV_ID_OPL3 "opl3-synth"
83
84#endif /* __SOUND_SEQ_DEVICE_H */
85

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