linux/include/sound/rawmidi.h
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   1#ifndef __SOUND_RAWMIDI_H
   2#define __SOUND_RAWMIDI_H
   3
   4/*
   5 *  Abstract layer for MIDI v1.0 stream
   6 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   7 *
   8 *
   9 *   This program is free software; you can redistribute it and/or modify
  10 *   it under the terms of the GNU General Public License as published by
  11 *   the Free Software Foundation; either version 2 of the License, or
  12 *   (at your option) any later version.
  13 *
  14 *   This program is distributed in the hope that it will be useful,
  15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 *   GNU General Public License for more details.
  18 *
  19 *   You should have received a copy of the GNU General Public License
  20 *   along with this program; if not, write to the Free Software
  21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22 *
  23 */
  24
  25#include <sound/asound.h>
  26#include <linux/interrupt.h>
  27#include <linux/spinlock.h>
  28#include <linux/wait.h>
  29#include <linux/mutex.h>
  30#include <linux/workqueue.h>
  31
  32#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
  33#include "seq_device.h"
  34#endif
  35
  36/*
  37 *  Raw MIDI interface
  38 */
  39
  40#define SNDRV_RAWMIDI_DEVICES           8
  41
  42#define SNDRV_RAWMIDI_LFLG_OUTPUT       (1<<0)
  43#define SNDRV_RAWMIDI_LFLG_INPUT        (1<<1)
  44#define SNDRV_RAWMIDI_LFLG_OPEN         (3<<0)
  45#define SNDRV_RAWMIDI_LFLG_APPEND       (1<<2)
  46
  47struct snd_rawmidi;
  48struct snd_rawmidi_substream;
  49struct snd_seq_port_info;
  50struct pid;
  51
  52struct snd_rawmidi_ops {
  53        int (*open) (struct snd_rawmidi_substream * substream);
  54        int (*close) (struct snd_rawmidi_substream * substream);
  55        void (*trigger) (struct snd_rawmidi_substream * substream, int up);
  56        void (*drain) (struct snd_rawmidi_substream * substream);
  57};
  58
  59struct snd_rawmidi_global_ops {
  60        int (*dev_register) (struct snd_rawmidi * rmidi);
  61        int (*dev_unregister) (struct snd_rawmidi * rmidi);
  62        void (*get_port_info)(struct snd_rawmidi *rmidi, int number,
  63                              struct snd_seq_port_info *info);
  64};
  65
  66struct snd_rawmidi_runtime {
  67        struct snd_rawmidi_substream *substream;
  68        unsigned int drain: 1,  /* drain stage */
  69                     oss: 1;    /* OSS compatible mode */
  70        /* midi stream buffer */
  71        unsigned char *buffer;  /* buffer for MIDI data */
  72        size_t buffer_size;     /* size of buffer */
  73        size_t appl_ptr;        /* application pointer */
  74        size_t hw_ptr;          /* hardware pointer */
  75        size_t avail_min;       /* min avail for wakeup */
  76        size_t avail;           /* max used buffer for wakeup */
  77        size_t xruns;           /* over/underruns counter */
  78        /* misc */
  79        spinlock_t lock;
  80        wait_queue_head_t sleep;
  81        /* event handler (new bytes, input only) */
  82        void (*event)(struct snd_rawmidi_substream *substream);
  83        /* defers calls to event [input] or ops->trigger [output] */
  84        struct work_struct event_work;
  85        /* private data */
  86        void *private_data;
  87        void (*private_free)(struct snd_rawmidi_substream *substream);
  88};
  89
  90struct snd_rawmidi_substream {
  91        struct list_head list;          /* list of all substream for given stream */
  92        int stream;                     /* direction */
  93        int number;                     /* substream number */
  94        unsigned int opened: 1,         /* open flag */
  95                     append: 1,         /* append flag (merge more streams) */
  96                     active_sensing: 1; /* send active sensing when close */
  97        int use_count;                  /* use counter (for output) */
  98        size_t bytes;
  99        struct snd_rawmidi *rmidi;
 100        struct snd_rawmidi_str *pstr;
 101        char name[32];
 102        struct snd_rawmidi_runtime *runtime;
 103        struct pid *pid;
 104        /* hardware layer */
 105        struct snd_rawmidi_ops *ops;
 106};
 107
 108struct snd_rawmidi_file {
 109        struct snd_rawmidi *rmidi;
 110        struct snd_rawmidi_substream *input;
 111        struct snd_rawmidi_substream *output;
 112};
 113
 114struct snd_rawmidi_str {
 115        unsigned int substream_count;
 116        unsigned int substream_opened;
 117        struct list_head substreams;
 118};
 119
 120struct snd_rawmidi {
 121        struct snd_card *card;
 122        struct list_head list;
 123        unsigned int device;            /* device number */
 124        unsigned int info_flags;        /* SNDRV_RAWMIDI_INFO_XXXX */
 125        char id[64];
 126        char name[80];
 127
 128#ifdef CONFIG_SND_OSSEMUL
 129        int ossreg;
 130#endif
 131
 132        struct snd_rawmidi_global_ops *ops;
 133
 134        struct snd_rawmidi_str streams[2];
 135
 136        void *private_data;
 137        void (*private_free) (struct snd_rawmidi *rmidi);
 138
 139        struct mutex open_mutex;
 140        wait_queue_head_t open_wait;
 141
 142        struct snd_info_entry *dev;
 143        struct snd_info_entry *proc_entry;
 144
 145#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
 146        struct snd_seq_device *seq_dev;
 147#endif
 148};
 149
 150/* main rawmidi functions */
 151
 152int snd_rawmidi_new(struct snd_card *card, char *id, int device,
 153                    int output_count, int input_count,
 154                    struct snd_rawmidi **rmidi);
 155void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
 156                         struct snd_rawmidi_ops *ops);
 157
 158/* callbacks */
 159
 160void snd_rawmidi_receive_reset(struct snd_rawmidi_substream *substream);
 161int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 162                        const unsigned char *buffer, int count);
 163void snd_rawmidi_transmit_reset(struct snd_rawmidi_substream *substream);
 164int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream);
 165int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
 166                              unsigned char *buffer, int count);
 167int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count);
 168int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
 169                         unsigned char *buffer, int count);
 170
 171/* main midi functions */
 172
 173int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info);
 174int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 175                            int mode, struct snd_rawmidi_file *rfile);
 176int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
 177int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 178                              struct snd_rawmidi_params *params);
 179int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 180                             struct snd_rawmidi_params *params);
 181int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream);
 182int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream);
 183int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream);
 184long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 185                             unsigned char *buf, long count);
 186long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
 187                              const unsigned char *buf, long count);
 188
 189#endif /* __SOUND_RAWMIDI_H */
 190
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