1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_RAWMIDI_H
3 #define __SOUND_RAWMIDI_H
6 * Abstract layer for MIDI v1.0 stream
7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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>
18 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
19 #include <sound/seq_device.h>
26 #define SNDRV_RAWMIDI_DEVICES 8
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)
34 struct snd_rawmidi_substream;
35 struct snd_seq_port_info;
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);
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);
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 */
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;
74 void (*private_free)(struct snd_rawmidi_substream *substream);
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 unsigned int framing; /* whether to frame input data */
85 unsigned int clock_type; /* clock source to use for input framing */
86 int use_count; /* use counter (for output) */
88 struct snd_rawmidi *rmidi;
89 struct snd_rawmidi_str *pstr;
91 struct snd_rawmidi_runtime *runtime;
94 const struct snd_rawmidi_ops *ops;
97 struct snd_rawmidi_file {
98 struct snd_rawmidi *rmidi;
99 struct snd_rawmidi_substream *input;
100 struct snd_rawmidi_substream *output;
103 struct snd_rawmidi_str {
104 unsigned int substream_count;
105 unsigned int substream_opened;
106 struct list_head substreams;
110 struct snd_card *card;
111 struct list_head list;
112 unsigned int device; /* device number */
113 unsigned int info_flags; /* SNDRV_RAWMIDI_INFO_XXXX */
117 #ifdef CONFIG_SND_OSSEMUL
121 const struct snd_rawmidi_global_ops *ops;
123 struct snd_rawmidi_str streams[2];
126 void (*private_free) (struct snd_rawmidi *rmidi);
128 struct mutex open_mutex;
129 wait_queue_head_t open_wait;
133 struct snd_info_entry *proc_entry;
135 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
136 struct snd_seq_device *seq_dev;
140 /* main rawmidi functions */
142 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
143 int output_count, int input_count,
144 struct snd_rawmidi **rmidi);
145 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
146 const struct snd_rawmidi_ops *ops);
150 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
151 const unsigned char *buffer, int count);
152 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream);
153 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
154 unsigned char *buffer, int count);
155 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count);
156 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
157 unsigned char *buffer, int count);
158 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
159 unsigned char *buffer, int count);
160 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream,
162 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream);
164 /* main midi functions */
166 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info);
167 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
168 int mode, struct snd_rawmidi_file *rfile);
169 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile);
170 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
171 struct snd_rawmidi_params *params);
172 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
173 struct snd_rawmidi_params *params);
174 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream);
175 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream);
176 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream);
177 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
178 unsigned char *buf, long count);
179 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
180 const unsigned char *buf, long count);
182 #endif /* __SOUND_RAWMIDI_H */