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 typedef struct snd_seq_device snd_seq_device_t;
  25 typedef struct snd_seq_dev_ops snd_seq_dev_ops_t;
  26
  27 /*
  28  * registered device information
  29  */
  30
  31 #define ID_LEN  32
  32
  33 /* status flag */
  34 #define SNDRV_SEQ_DEVICE_FREE           0
  35 #define SNDRV_SEQ_DEVICE_REGISTERED     1
  36
  37 struct snd_seq_device {
  38         /* device info */
  39         snd_card_t *card;       /* sound card */
  40         int device;             /* device number */
  41         char id[ID_LEN];        /* driver id */
  42         char name[80];          /* device name */
  43         int argsize;            /* size of the argument */
  44         void *driver_data;      /* private data for driver */
  45         int status;             /* flag - read only */
  46         void *private_data;     /* private data for the caller */
  47         void (*private_free)(snd_seq_device_t *device);
  48         struct list_head list;  /* link to next device */
  49 };
  50
  51
  52 /* driver operators
  53  * init_device:
  54  *      Initialize the device with given parameters.
  55  *      Typically,
  56  *              1. call snd_hwdep_new
  57  *              2. allocate private data and initialize it
  58  *              3. call snd_hwdep_register
  59  *              4. store the instance to dev->driver_data pointer.
  60  *
  61  * free_device:
  62  *      Release the private data.
  63  *      Typically, call snd_device_free(dev->card, dev->driver_data)
  64  */
  65 struct snd_seq_dev_ops {
  66         int (*init_device)(snd_seq_device_t *dev);
  67         int (*free_device)(snd_seq_device_t *dev);
  68 };
  69
  70 /*
  71  * prototypes
  72  */
  73 void snd_seq_device_load_drivers(void);
  74 int snd_seq_device_new(snd_card_t *card, int device, char *id, int argsize, snd_seq_device_t **result);
  75 int snd_seq_device_register_driver(char *id, snd_seq_dev_ops_t *entry, int argsize);
  76 int snd_seq_device_unregister_driver(char *id);
  77
  78 #define SNDRV_SEQ_DEVICE_ARGPTR(dev) (void *)((char *)(dev) + sizeof(snd_seq_device_t))
  79
  80
  81 /*
  82  * id strings for generic devices
  83  */
  84 #define SNDRV_SEQ_DEV_ID_MIDISYNTH      "seq-midi"
  85 #define SNDRV_SEQ_DEV_ID_OPL3           "opl3-synth"
  86
  87
  88 #endif /* __SOUND_SEQ_DEVICE_H */