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Diffstat (limited to 'include/sound/rawmidi.h')
| -rw-r--r-- | include/sound/rawmidi.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/include/sound/rawmidi.h b/include/sound/rawmidi.h new file mode 100644 index 000000000..e1f59b294 --- /dev/null +++ b/include/sound/rawmidi.h @@ -0,0 +1,179 @@ +/* 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 */ + 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 */ + unsigned int framing; /* whether to frame input data */ + unsigned int clock_type; /* clock source to use for input framing */ + int use_count; /* use counter (for output) */ + size_t bytes; + spinlock_t lock; + 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; + unsigned int user_pversion; /* supported protocol version */ +}; + +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_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 */ |