LXR linux/include/sound/rawmidi.h

   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#include <linux/device.h>
  32
  33#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
  34#include <sound/seq_device.h>
  35#endif
  36
  37/*
  38 *  Raw MIDI interface
  39 */
  40
  41#define SNDRV_RAWMIDI_DEVICES           8
  42
  43#define SNDRV_RAWMIDI_LFLG_OUTPUT       (1<<0)
  44#define SNDRV_RAWMIDI_LFLG_INPUT        (1<<1)
  45#define SNDRV_RAWMIDI_LFLG_OPEN         (3<<0)
  46#define SNDRV_RAWMIDI_LFLG_APPEND       (1<<2)
  47
  48struct snd_rawmidi;
  49struct snd_rawmidi_substream;
  50struct snd_seq_port_info;
  51struct pid;
  52
  53struct snd_rawmidi_ops {
  54        int (*open) (struct snd_rawmidi_substream * substream);
  55        int (*close) (struct snd_rawmidi_substream * substream);
  56        void (*trigger) (struct snd_rawmidi_substream * substream, int up);
  57        void (*drain) (struct snd_rawmidi_substream * substream);
  58};
  59
  60struct snd_rawmidi_global_ops {
  61        int (*dev_register) (struct snd_rawmidi * rmidi);
  62        int (*dev_unregister) (struct snd_rawmidi * rmidi);
  63        void (*get_port_info)(struct snd_rawmidi *rmidi, int number,
  64                              struct snd_seq_port_info *info);
  65};
  66
  67struct snd_rawmidi_runtime {
  68        struct snd_rawmidi_substream *substream;
  69        unsigned int drain: 1,  /* drain stage */
  70                     oss: 1;    /* OSS compatible mode */
  71        /* midi stream buffer */
  72        unsigned char *buffer;  /* buffer for MIDI data */
  73        size_t buffer_size;     /* size of buffer */
  74        size_t appl_ptr;        /* application pointer */
  75        size_t hw_ptr;          /* hardware pointer */
  76        size_t avail_min;       /* min avail for wakeup */
  77        size_t avail;           /* max used buffer for wakeup */
  78        size_t xruns;           /* over/underruns counter */
  79        /* misc */
  80        spinlock_t lock;
  81        wait_queue_head_t sleep;
  82        /* event handler (new bytes, input only) */
  83        void (*event)(struct snd_rawmidi_substream *substream);
  84        /* defers calls to event [input] or ops->trigger [output] */
  85        struct work_struct event_work;
  86        /* private data */
  87        void *private_data;
  88        void (*private_free)(struct snd_rawmidi_substream *substream);
  89};
  90
  91struct snd_rawmidi_substream {
  92        struct list_head list;          /* list of all substream for given stream */
  93        int stream;                     /* direction */
  94        int number;                     /* substream number */
  95        unsigned int opened: 1,         /* open flag */
  96                     append: 1,         /* append flag (merge more streams) */
  97                     active_sensing: 1; /* send active sensing when close */
  98        int use_count;                  /* use counter (for output) */
  99        size_t bytes;
 100        struct snd_rawmidi *rmidi;
 101        struct snd_rawmidi_str *pstr;
 102        char name[32];
 103        struct snd_rawmidi_runtime *runtime;
 104        struct pid *pid;
 105        /* hardware layer */
 106        const struct snd_rawmidi_ops *ops;
 107};
 108
 109struct snd_rawmidi_file {
 110        struct snd_rawmidi *rmidi;
 111        struct snd_rawmidi_substream *input;
 112        struct snd_rawmidi_substream *output;
 113};
 114
 115struct snd_rawmidi_str {
 116        unsigned int substream_count;
 117        unsigned int substream_opened;
 118        struct list_head substreams;
 119};
 120
 121struct snd_rawmidi {
 122        struct snd_card *card;
 123        struct list_head list;
 124        unsigned int device;            /* device number */
 125        unsigned int info_flags;        /* SNDRV_RAWMIDI_INFO_XXXX */
 126        char id[64];
 127        char name[80];
 128
 129#ifdef CONFIG_SND_OSSEMUL
 130        int ossreg;
 131#endif
 132
 133        const struct snd_rawmidi_global_ops *ops;
 134
 135        struct snd_rawmidi_str streams[2];
 136
 137        void *private_data;
 138        void (*private_free) (struct snd_rawmidi *rmidi);
 139
 140        struct mutex open_mutex;
 141        wait_queue_head_t open_wait;
 142
 143        struct device dev;
 144
 145        struct snd_info_entry *proc_entry;
 146
 147#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
 148        struct snd_seq_device *seq_dev;
 149#endif
 150};
 151
 152/* main rawmidi functions */
 153
 154int snd_rawmidi_new(struct snd_card *card, char *id, int device,
 155                    int output_count, int input_count,
 156                    struct snd_rawmidi **rmidi);
 157void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
 158                         const struct snd_rawmidi_ops *ops);
 159
 160/* callbacks */
 161
 162void snd_rawmidi_receive_reset(struct snd_rawmidi_substream *substream);
 163int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 164                        const unsigned char *buffer, int count);
 165void snd_rawmidi_transmit_reset(struct snd_rawmidi_substream *substream);
 166int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream);
 167int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
 168                              unsigned char *buffer, int count);
 169int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count);
 170int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
 171                         unsigned char *buffer, int count);
 172int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
 173                              unsigned char *buffer, int count);
 174int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
 175                               int count);
 176
 177/* main midi functions */
 178
 179int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info);
 180int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 181                            int mode, struct snd_rawmidi_file *rfile);
 182int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
 183int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 184                              struct snd_rawmidi_params *params);
 185int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 186                             struct snd_rawmidi_params *params);
 187int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream);
 188int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream);
 189int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream);
 190long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
 191                             unsigned char *buf, long count);
 192long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
 193                              const unsigned char *buf, long count);
 194
 195#endif /* __SOUND_RAWMIDI_H */
 196