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Release 4.12 include/sound/rawmidi.h

Directory: include/sound


 *  Abstract layer for MIDI v1.0 stream
 *  Copyright (c) by Jaroslav Kysela <>
 *   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 <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/device.h>

#include <sound/seq_device.h>

 *  Raw MIDI interface






struct snd_rawmidi;
struct snd_rawmidi_substream;
struct snd_seq_port_info;
struct pid;

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 {
struct snd_rawmidi_substream *substream;
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 work_struct event_work;
	/* 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;
struct pid *pid;
	/* hardware layer */
const 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];

int ossreg;

const 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 device dev;

struct snd_info_entry *proc_entry;

struct snd_seq_device *seq_dev;

/* 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,
			 const struct snd_rawmidi_ops *ops);

/* callbacks */

int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
			const unsigned char *buffer, int count);
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);
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);

/* 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 */

Overall Contributors

Jaroslav Kysela58774.68%633.33%
Takashi Iwai14818.83%527.78%
Clemens Ladisch394.96%316.67%
David S. Miller81.02%15.56%
Ingo Molnar20.25%15.56%
David Howells10.13%15.56%
Julia Lawall10.13%15.56%
Directory: include/sound
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