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 *  Abstract layer for MIDI v1.0 stream
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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
 *   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 <asm/semaphore.h>

#include "seq_device.h"

 *  Raw MIDI interface

typedef enum sndrv_rawmidi_stream snd_rawmidi_stream_t;
typedef struct sndrv_rawmidi_info snd_rawmidi_info_t;
typedef struct sndrv_rawmidi_params snd_rawmidi_params_t;
typedef struct sndrv_rawmidi_status snd_rawmidi_status_t;


#define SNDRV_RAWMIDI_LFLG_INPUT    (1<<1)
#define SNDRV_RAWMIDI_LFLG_OPEN           (3<<0)

typedef struct _snd_rawmidi_runtime snd_rawmidi_runtime_t;
typedef struct _snd_rawmidi_substream snd_rawmidi_substream_t;
typedef struct _snd_rawmidi_str snd_rawmidi_str_t;

typedef struct _snd_rawmidi_ops {
      int (*open) (snd_rawmidi_substream_t * substream);
      int (*close) (snd_rawmidi_substream_t * substream);
      void (*trigger) (snd_rawmidi_substream_t * substream, int up);
      void (*drain) (snd_rawmidi_substream_t * substream);
} snd_rawmidi_ops_t;

typedef struct _snd_rawmidi_global_ops {
      int (*dev_register) (snd_rawmidi_t * rmidi);
      int (*dev_unregister) (snd_rawmidi_t * rmidi);
} snd_rawmidi_global_ops_t;

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)(snd_rawmidi_substream_t *substream);
      /* defers calls to event [input] or ops->trigger [output] */
      struct tasklet_struct tasklet;
      /* private data */
      void *private_data;
      void (*private_free)(snd_rawmidi_substream_t *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;
      snd_rawmidi_t *rmidi;
      snd_rawmidi_str_t *pstr;
      char name[32];
      snd_rawmidi_runtime_t *runtime;
      /* hardware layer */
      snd_rawmidi_ops_t *ops;

typedef struct _snd_rawmidi_file {
      snd_rawmidi_t *rmidi;
      snd_rawmidi_substream_t *input;
      snd_rawmidi_substream_t *output;
} snd_rawmidi_file_t;

struct _snd_rawmidi_str {
      unsigned int substream_count;
      unsigned int substream_opened;
      struct list_head substreams;

struct _snd_rawmidi {
      snd_card_t *card;

      unsigned int device;          /* device number */
      unsigned int info_flags;      /* SNDRV_RAWMIDI_INFO_XXXX */
      char id[64];
      char name[80];

      int ossreg;

      snd_rawmidi_global_ops_t *ops;

      snd_rawmidi_str_t streams[2];

      void *private_data;
      void (*private_free) (snd_rawmidi_t *rmidi);

      struct semaphore open_mutex;
      wait_queue_head_t open_wait;

      snd_info_entry_t *dev;
      snd_info_entry_t *proc_entry;

      snd_seq_device_t *seq_dev;

/* main rawmidi functions */

int snd_rawmidi_new(snd_card_t * card, char *id, int device,
                int output_count, int input_count,
                snd_rawmidi_t ** rmidi);
void snd_rawmidi_set_ops(snd_rawmidi_t * rmidi, int stream, snd_rawmidi_ops_t * ops);

/* callbacks */

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

/* main midi functions */

int snd_rawmidi_info_select(snd_card_t *card, snd_rawmidi_info_t *info);
int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice, int mode, snd_rawmidi_file_t * rfile);
int snd_rawmidi_kernel_release(snd_rawmidi_file_t * rfile);
int snd_rawmidi_output_params(snd_rawmidi_substream_t * substream, snd_rawmidi_params_t * params);
int snd_rawmidi_input_params(snd_rawmidi_substream_t * substream, snd_rawmidi_params_t * params);
int snd_rawmidi_drop_output(snd_rawmidi_substream_t * substream);
int snd_rawmidi_drain_output(snd_rawmidi_substream_t * substream);
int snd_rawmidi_drain_input(snd_rawmidi_substream_t * substream);
long snd_rawmidi_kernel_read(snd_rawmidi_substream_t * substream, unsigned char *buf, long count);
long snd_rawmidi_kernel_write(snd_rawmidi_substream_t * substream, const unsigned char *buf, long count);

#endif /* __SOUND_RAWMIDI_H */

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