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rawmidi.h

#ifndef __SOUND_RAWMIDI_H
#define __SOUND_RAWMIDI_H

/*
 *  Abstract layer for MIDI v1.0 stream
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/asound.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/mutex.h>

#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
#include "seq_device.h"
#endif

/*
 *  Raw MIDI interface
 */

#define SNDRV_RAWMIDI_DEVICES       8

#define SNDRV_RAWMIDI_LFLG_OUTPUT   (1<<0)
#define SNDRV_RAWMIDI_LFLG_INPUT    (1<<1)
#define SNDRV_RAWMIDI_LFLG_OPEN           (3<<0)
#define SNDRV_RAWMIDI_LFLG_APPEND   (1<<2)
#define     SNDRV_RAWMIDI_LFLG_NOOPENLOCK (1<<3)

struct snd_rawmidi;
struct snd_rawmidi_substream;
struct snd_seq_port_info;

struct snd_rawmidi_ops {
      int (*open) (struct snd_rawmidi_substream * substream);
      int (*close) (struct snd_rawmidi_substream * substream);
      void (*trigger) (struct snd_rawmidi_substream * substream, int up);
      void (*drain) (struct snd_rawmidi_substream * substream);
};

struct snd_rawmidi_global_ops {
      int (*dev_register) (struct snd_rawmidi * rmidi);
      int (*dev_unregister) (struct snd_rawmidi * rmidi);
      void (*get_port_info)(struct snd_rawmidi *rmidi, int number,
                        struct snd_seq_port_info *info);
};

struct snd_rawmidi_runtime {
      unsigned int drain: 1,  /* drain stage */
                 oss: 1;      /* OSS compatible mode */
      /* midi stream buffer */
      unsigned char *buffer;  /* buffer for MIDI data */
      size_t buffer_size;     /* size of buffer */
      size_t appl_ptr;  /* application pointer */
      size_t hw_ptr;          /* hardware pointer */
      size_t avail_min; /* min avail for wakeup */
      size_t avail;           /* max used buffer for wakeup */
      size_t xruns;           /* over/underruns counter */
      /* misc */
      spinlock_t lock;
      wait_queue_head_t sleep;
      /* event handler (new bytes, input only) */
      void (*event)(struct snd_rawmidi_substream *substream);
      /* defers calls to event [input] or ops->trigger [output] */
      struct tasklet_struct tasklet;
      /* private data */
      void *private_data;
      void (*private_free)(struct snd_rawmidi_substream *substream);
};

struct snd_rawmidi_substream {
      struct list_head list;        /* list of all substream for given stream */
      int stream;             /* direction */
      int number;             /* substream number */
      unsigned int opened: 1,       /* open flag */
                 append: 1,         /* append flag (merge more streams) */
                 active_sensing: 1; /* send active sensing when close */
      int use_count;                /* use counter (for output) */
      size_t bytes;
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_str *pstr;
      char name[32];
      struct snd_rawmidi_runtime *runtime;
      /* hardware layer */
      struct snd_rawmidi_ops *ops;
};

struct snd_rawmidi_file {
      struct snd_rawmidi *rmidi;
      struct snd_rawmidi_substream *input;
      struct snd_rawmidi_substream *output;
};

struct snd_rawmidi_str {
      unsigned int substream_count;
      unsigned int substream_opened;
      struct list_head substreams;
};

struct snd_rawmidi {
      struct snd_card *card;
      struct list_head list;
      unsigned int device;          /* device number */
      unsigned int info_flags;      /* SNDRV_RAWMIDI_INFO_XXXX */
      char id[64];
      char name[80];

#ifdef CONFIG_SND_OSSEMUL
      int ossreg;
#endif

      struct snd_rawmidi_global_ops *ops;

      struct snd_rawmidi_str streams[2];

      void *private_data;
      void (*private_free) (struct snd_rawmidi *rmidi);

      struct mutex open_mutex;
      wait_queue_head_t open_wait;

      struct snd_info_entry *dev;
      struct snd_info_entry *proc_entry;

#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
      struct snd_seq_device *seq_dev;
#endif
};

/* main rawmidi functions */

int snd_rawmidi_new(struct snd_card *card, char *id, int device,
                int output_count, int input_count,
                struct snd_rawmidi **rmidi);
void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
                   struct snd_rawmidi_ops *ops);

/* callbacks */

void snd_rawmidi_receive_reset(struct snd_rawmidi_substream *substream);
int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
                  const unsigned char *buffer, int count);
void snd_rawmidi_transmit_reset(struct snd_rawmidi_substream *substream);
int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream);
int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
                        unsigned char *buffer, int count);
int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count);
int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
                   unsigned char *buffer, int count);

/* main midi functions */

int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info);
int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
                      int mode, struct snd_rawmidi_file *rfile);
int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
                        struct snd_rawmidi_params *params);
int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
                       struct snd_rawmidi_params *params);
int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream);
int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream);
int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream);
long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
                       unsigned char *buf, long count);
long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
                        const unsigned char *buf, long count);

#endif /* __SOUND_RAWMIDI_H */

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