linux/include/sound/seq_device.h
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   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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