LXR linux/include/sound/rawmidi.h

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