[linux-block.git] / include / sound / rawmidi.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_RAWMIDI_H
#define __SOUND_RAWMIDI_H

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

#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>

#if IS_ENABLED(CONFIG_SND_SEQUENCER)
#include <sound/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)

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 */
	int buffer_ref;		/* buffer reference count */
	/* 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 */
	bool opened;			/* open flag */
	bool append;			/* append flag (merge more streams) */
	bool active_sensing;		/* 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];

#ifdef CONFIG_SND_OSSEMUL
	int ossreg;
#endif

	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;

#if IS_ENABLED(CONFIG_SND_SEQUENCER)
	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,
			 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);
int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream);

/* 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 */
Commit	Line	Data
1a59d1b8	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	#ifndef __SOUND_RAWMIDI_H
	3	#define __SOUND_RAWMIDI_H
	4
	5	/*
	6	* Abstract layer for MIDI v1.0 stream
c1017a4c	7	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	8	*/
	9
	10	#include <sound/asound.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/wait.h>
1a60d4c5	14	#include <linux/mutex.h>
b3c705aa	15	#include <linux/workqueue.h>
aee5012f	16	#include <linux/device.h>
1da177e4	17
6d2412b8	18	#if IS_ENABLED(CONFIG_SND_SEQUENCER)
a1ce3928	19	#include <sound/seq_device.h>
1da177e4 LT	20	#endif
	21
	22	/*
	23	* Raw MIDI interface
	24	*/
	25
1da177e4 LT	26	#define SNDRV_RAWMIDI_DEVICES 8
	27
	28	#define SNDRV_RAWMIDI_LFLG_OUTPUT (1<<0)
	29	#define SNDRV_RAWMIDI_LFLG_INPUT (1<<1)
	30	#define SNDRV_RAWMIDI_LFLG_OPEN (3<<0)
	31	#define SNDRV_RAWMIDI_LFLG_APPEND (1<<2)
1da177e4	32
48c9d417 TI	33	struct snd_rawmidi;
48c9d417 TI	34	struct snd_rawmidi_substream;
a7b928ac	35	struct snd_seq_port_info;
7584af10	36	struct pid;
1da177e4	37
48c9d417 TI	38	struct snd_rawmidi_ops {
	39	int (open) (struct snd_rawmidi_substream substream);
	40	int (close) (struct snd_rawmidi_substream substream);
	41	void (trigger) (struct snd_rawmidi_substream substream, int up);
	42	void (drain) (struct snd_rawmidi_substream substream);
	43	};
1da177e4	44
48c9d417 TI	45	struct snd_rawmidi_global_ops {
	46	int (dev_register) (struct snd_rawmidi rmidi);
	47	int (dev_unregister) (struct snd_rawmidi rmidi);
a7b928ac CL	48	void (get_port_info)(struct snd_rawmidi rmidi, int number,
a7b928ac CL	49	struct snd_seq_port_info *info);
48c9d417	50	};
1da177e4	51
48c9d417	52	struct snd_rawmidi_runtime {
b3c705aa	53	struct snd_rawmidi_substream *substream;
1da177e4 LT	54	unsigned int drain: 1, /* drain stage */
	55	oss: 1; /* OSS compatible mode */
	56	/* midi stream buffer */
	57	unsigned char buffer; / buffer for MIDI data */
	58	size_t buffer_size; /* size of buffer */
	59	size_t appl_ptr; /* application pointer */
	60	size_t hw_ptr; /* hardware pointer */
	61	size_t avail_min; /* min avail for wakeup */
	62	size_t avail; /* max used buffer for wakeup */
	63	size_t xruns; /* over/underruns counter */
c1f6e3c8	64	int buffer_ref; /* buffer reference count */
1da177e4 LT	65	/* misc */
	66	spinlock_t lock;
	67	wait_queue_head_t sleep;
	68	/* event handler (new bytes, input only) */
48c9d417	69	void (event)(struct snd_rawmidi_substream substream);
1da177e4	70	/* defers calls to event [input] or ops->trigger [output] */
b3c705aa	71	struct work_struct event_work;
1da177e4 LT	72	/* private data */
1da177e4 LT	73	void *private_data;
48c9d417	74	void (private_free)(struct snd_rawmidi_substream substream);
1da177e4 LT	75	};
1da177e4 LT	76
48c9d417	77	struct snd_rawmidi_substream {
1da177e4 LT	78	struct list_head list; /* list of all substream for given stream */
	79	int stream; /* direction */
	80	int number; /* substream number */
dfa9a5ef TI	81	bool opened; /* open flag */
	82	bool append; /* append flag (merge more streams) */
	83	bool active_sensing; /* send active sensing when close */
1da177e4 LT	84	int use_count; /* use counter (for output) */
1da177e4 LT	85	size_t bytes;
48c9d417 TI	86	struct snd_rawmidi *rmidi;
48c9d417 TI	87	struct snd_rawmidi_str *pstr;
1da177e4	88	char name[32];
48c9d417	89	struct snd_rawmidi_runtime *runtime;
7584af10	90	struct pid *pid;
1da177e4	91	/* hardware layer */
6ba79b85	92	const struct snd_rawmidi_ops *ops;
1da177e4 LT	93	};
1da177e4 LT	94
48c9d417 TI	95	struct snd_rawmidi_file {
	96	struct snd_rawmidi *rmidi;
	97	struct snd_rawmidi_substream *input;
	98	struct snd_rawmidi_substream *output;
	99	};
1da177e4	100
48c9d417	101	struct snd_rawmidi_str {
1da177e4 LT	102	unsigned int substream_count;
	103	unsigned int substream_opened;
	104	struct list_head substreams;
	105	};
	106
48c9d417 TI	107	struct snd_rawmidi {
48c9d417 TI	108	struct snd_card *card;
f87135f5	109	struct list_head list;
1da177e4 LT	110	unsigned int device; /* device number */
	111	unsigned int info_flags; /* SNDRV_RAWMIDI_INFO_XXXX */
	112	char id[64];
	113	char name[80];
	114
	115	#ifdef CONFIG_SND_OSSEMUL
	116	int ossreg;
	117	#endif
	118
efdbe3c3	119	const struct snd_rawmidi_global_ops *ops;
1da177e4	120
48c9d417	121	struct snd_rawmidi_str streams[2];
1da177e4 LT	122
1da177e4 LT	123	void *private_data;
48c9d417	124	void (private_free) (struct snd_rawmidi rmidi);
1da177e4	125
1a60d4c5	126	struct mutex open_mutex;
1da177e4 LT	127	wait_queue_head_t open_wait;
1da177e4 LT	128
aee5012f TI	129	struct device dev;
aee5012f TI	130
48c9d417	131	struct snd_info_entry *proc_entry;
1da177e4	132
6d2412b8	133	#if IS_ENABLED(CONFIG_SND_SEQUENCER)
48c9d417	134	struct snd_seq_device *seq_dev;
1da177e4 LT	135	#endif
	136	};
	137
	138	/* main rawmidi functions */
	139
48c9d417	140	int snd_rawmidi_new(struct snd_card card, char id, int device,
1da177e4	141	int output_count, int input_count,
48c9d417 TI	142	struct snd_rawmidi **rmidi);
48c9d417 TI	143	void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
6ba79b85	144	const struct snd_rawmidi_ops *ops);
1da177e4 LT	145
	146	/* callbacks */
	147
48c9d417 TI	148	int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
48c9d417 TI	149	const unsigned char *buffer, int count);
48c9d417 TI	150	int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream);
	151	int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
	152	unsigned char *buffer, int count);
	153	int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count);
	154	int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
	155	unsigned char *buffer, int count);
06ab3003 TI	156	int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
	157	unsigned char *buffer, int count);
	158	int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
	159	int count);
6aea5702	160	int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream);
1da177e4 LT	161
	162	/* main midi functions */
	163
48c9d417	164	int snd_rawmidi_info_select(struct snd_card card, struct snd_rawmidi_info info);
f87135f5 CL	165	int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
f87135f5 CL	166	int mode, struct snd_rawmidi_file *rfile);
48c9d417 TI	167	int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
	168	int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
	169	struct snd_rawmidi_params *params);
	170	int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
	171	struct snd_rawmidi_params *params);
	172	int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream);
	173	int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream);
	174	int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream);
	175	long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
	176	unsigned char *buf, long count);
	177	long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
	178	const unsigned char *buf, long count);
1da177e4 LT	179
1da177e4 LT	180	#endif /* __SOUND_RAWMIDI_H */