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180 lines
5.6 KiB
180 lines
5.6 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef __SOUND_RAWMIDI_H |
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#define __SOUND_RAWMIDI_H |
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/* |
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* Abstract layer for MIDI v1.0 stream |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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*/ |
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#include <sound/asound.h> |
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#include <linux/interrupt.h> |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <linux/mutex.h> |
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#include <linux/workqueue.h> |
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#include <linux/device.h> |
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#if IS_ENABLED(CONFIG_SND_SEQUENCER) |
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#include <sound/seq_device.h> |
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#endif |
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/* |
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* Raw MIDI interface |
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*/ |
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#define SNDRV_RAWMIDI_DEVICES 8 |
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#define SNDRV_RAWMIDI_LFLG_OUTPUT (1<<0) |
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#define SNDRV_RAWMIDI_LFLG_INPUT (1<<1) |
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#define SNDRV_RAWMIDI_LFLG_OPEN (3<<0) |
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#define SNDRV_RAWMIDI_LFLG_APPEND (1<<2) |
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struct snd_rawmidi; |
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struct snd_rawmidi_substream; |
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struct snd_seq_port_info; |
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struct pid; |
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struct snd_rawmidi_ops { |
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int (*open) (struct snd_rawmidi_substream * substream); |
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int (*close) (struct snd_rawmidi_substream * substream); |
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void (*trigger) (struct snd_rawmidi_substream * substream, int up); |
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void (*drain) (struct snd_rawmidi_substream * substream); |
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}; |
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struct snd_rawmidi_global_ops { |
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int (*dev_register) (struct snd_rawmidi * rmidi); |
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int (*dev_unregister) (struct snd_rawmidi * rmidi); |
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void (*get_port_info)(struct snd_rawmidi *rmidi, int number, |
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struct snd_seq_port_info *info); |
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}; |
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struct snd_rawmidi_runtime { |
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struct snd_rawmidi_substream *substream; |
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unsigned int drain: 1, /* drain stage */ |
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oss: 1; /* OSS compatible mode */ |
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/* midi stream buffer */ |
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unsigned char *buffer; /* buffer for MIDI data */ |
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size_t buffer_size; /* size of buffer */ |
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size_t appl_ptr; /* application pointer */ |
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size_t hw_ptr; /* hardware pointer */ |
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size_t avail_min; /* min avail for wakeup */ |
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size_t avail; /* max used buffer for wakeup */ |
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size_t xruns; /* over/underruns counter */ |
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int buffer_ref; /* buffer reference count */ |
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/* misc */ |
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spinlock_t lock; |
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wait_queue_head_t sleep; |
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/* event handler (new bytes, input only) */ |
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void (*event)(struct snd_rawmidi_substream *substream); |
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/* defers calls to event [input] or ops->trigger [output] */ |
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struct work_struct event_work; |
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/* private data */ |
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void *private_data; |
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void (*private_free)(struct snd_rawmidi_substream *substream); |
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}; |
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struct snd_rawmidi_substream { |
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struct list_head list; /* list of all substream for given stream */ |
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int stream; /* direction */ |
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int number; /* substream number */ |
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bool opened; /* open flag */ |
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bool append; /* append flag (merge more streams) */ |
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bool active_sensing; /* send active sensing when close */ |
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int use_count; /* use counter (for output) */ |
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size_t bytes; |
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struct snd_rawmidi *rmidi; |
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struct snd_rawmidi_str *pstr; |
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char name[32]; |
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struct snd_rawmidi_runtime *runtime; |
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struct pid *pid; |
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/* hardware layer */ |
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const struct snd_rawmidi_ops *ops; |
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}; |
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struct snd_rawmidi_file { |
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struct snd_rawmidi *rmidi; |
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struct snd_rawmidi_substream *input; |
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struct snd_rawmidi_substream *output; |
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}; |
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struct snd_rawmidi_str { |
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unsigned int substream_count; |
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unsigned int substream_opened; |
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struct list_head substreams; |
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}; |
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struct snd_rawmidi { |
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struct snd_card *card; |
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struct list_head list; |
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unsigned int device; /* device number */ |
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unsigned int info_flags; /* SNDRV_RAWMIDI_INFO_XXXX */ |
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char id[64]; |
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char name[80]; |
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#ifdef CONFIG_SND_OSSEMUL |
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int ossreg; |
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#endif |
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const struct snd_rawmidi_global_ops *ops; |
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struct snd_rawmidi_str streams[2]; |
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void *private_data; |
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void (*private_free) (struct snd_rawmidi *rmidi); |
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struct mutex open_mutex; |
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wait_queue_head_t open_wait; |
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struct device dev; |
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struct snd_info_entry *proc_entry; |
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#if IS_ENABLED(CONFIG_SND_SEQUENCER) |
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struct snd_seq_device *seq_dev; |
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#endif |
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}; |
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/* main rawmidi functions */ |
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int snd_rawmidi_new(struct snd_card *card, char *id, int device, |
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int output_count, int input_count, |
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struct snd_rawmidi **rmidi); |
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void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, |
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const struct snd_rawmidi_ops *ops); |
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/* callbacks */ |
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int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, |
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const unsigned char *buffer, int count); |
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int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream); |
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int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, |
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unsigned char *buffer, int count); |
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int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count); |
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int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, |
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unsigned char *buffer, int count); |
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int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, |
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unsigned char *buffer, int count); |
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int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, |
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int count); |
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int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream); |
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/* main midi functions */ |
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int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info); |
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int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, |
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int mode, struct snd_rawmidi_file *rfile); |
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int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile); |
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int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, |
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struct snd_rawmidi_params *params); |
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int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, |
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struct snd_rawmidi_params *params); |
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int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream); |
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int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream); |
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int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream); |
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long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, |
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unsigned char *buf, long count); |
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long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, |
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const unsigned char *buf, long count); |
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#endif /* __SOUND_RAWMIDI_H */
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