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 33 struct snd_rawmidi; 34 struct snd_rawmidi_substream; 35 struct snd_seq_port_info; 36 struct pid; 37 38 struct 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 45 struct 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 52 struct 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 int buffer_ref; /* buffer reference count */ 65 /* misc */ 66 spinlock_t lock; 67 wait_queue_head_t sleep; 68 /* event handler (new bytes, input only) */ 69 void (*event)(struct snd_rawmidi_substream *substream); 70 /* defers calls to event [input] or ops->trigger [output] */ 71 struct work_struct event_work; 72 /* private data */ 73 void *private_data; 74 void (*private_free)(struct snd_rawmidi_substream *substream); 75 }; 76 77 struct snd_rawmidi_substream { 78 struct list_head list; /* list of all substream for given stream */ 79 int stream; /* direction */ 80 int number; /* substream number */ 81 bool opened; /* open flag */ 82 bool append; /* append flag (merge more streams) */ 83 bool active_sensing; /* send active sensing when close */ 84 int use_count; /* use counter (for output) */ 85 size_t bytes; 86 struct snd_rawmidi *rmidi; 87 struct snd_rawmidi_str *pstr; 88 char name[32]; 89 struct snd_rawmidi_runtime *runtime; 90 struct pid *pid; 91 /* hardware layer */ 92 const struct snd_rawmidi_ops *ops; 93 }; 94 95 struct snd_rawmidi_file { 96 struct snd_rawmidi *rmidi; 97 struct snd_rawmidi_substream *input; 98 struct snd_rawmidi_substream *output; 99 }; 100 101 struct snd_rawmidi_str { 102 unsigned int substream_count; 103 unsigned int substream_opened; 104 struct list_head substreams; 105 }; 106 107 struct snd_rawmidi { 108 struct snd_card *card; 109 struct list_head list; 110 unsigned int device; /* device number */ 111 unsigned int info_flags; /* SNDRV_RAWMIDI_INFO_XXXX */ 112 char id[64]; 113 char name[80]; 114 115 #ifdef CONFIG_SND_OSSEMUL 116 int ossreg; 117 #endif 118 119 const struct snd_rawmidi_global_ops *ops; 120 121 struct snd_rawmidi_str streams[2]; 122 123 void *private_data; 124 void (*private_free) (struct snd_rawmidi *rmidi); 125 126 struct mutex open_mutex; 127 wait_queue_head_t open_wait; 128 129 struct device dev; 130 131 struct snd_info_entry *proc_entry; 132 133 #if IS_ENABLED(CONFIG_SND_SEQUENCER) 134 struct snd_seq_device *seq_dev; 135 #endif 136 }; 137 138 /* main rawmidi functions */ 139 140 int snd_rawmidi_new(struct snd_card *card, char *id, int device, 141 int output_count, int input_count, 142 struct snd_rawmidi **rmidi); 143 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream, 144 const struct snd_rawmidi_ops *ops); 145 146 /* callbacks */ 147 148 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream, 149 const unsigned char *buffer, int count); 150 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream); 151 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 152 unsigned char *buffer, int count); 153 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count); 154 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream, 155 unsigned char *buffer, int count); 156 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream, 157 unsigned char *buffer, int count); 158 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, 159 int count); 160 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream); 161 162 /* main midi functions */ 163 164 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info); 165 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice, 166 int mode, struct snd_rawmidi_file *rfile); 167 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile); 168 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream, 169 struct snd_rawmidi_params *params); 170 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream, 171 struct snd_rawmidi_params *params); 172 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream); 173 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream); 174 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream); 175 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream, 176 unsigned char *buf, long count); 177 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream, 178 const unsigned char *buf, long count); 179 180 #endif /* __SOUND_RAWMIDI_H */ 181