1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3 * <linux/usb/midi.h> -- USB MIDI definitions.
4 *
5 * Copyright (C) 2006 Thumtronics Pty Ltd.
6 * Developed for Thumtronics by Grey Innovation
7 * Ben Williamson <ben.williamson@greyinnovation.com>
8 *
9 * This software is distributed under the terms of the GNU General Public
10 * License ("GPL") version 2, as published by the Free Software Foundation.
11 *
12 * This file holds USB constants and structures defined
13 * by the USB Device Class Definition for MIDI Devices.
14 * Comments below reference relevant sections of that document:
15 *
16 * http://www.usb.org/developers/devclass_docs/midi10.pdf
17 */
18
19 #ifndef __LINUX_USB_MIDI_H
20 #define __LINUX_USB_MIDI_H
21
22 #include <linux/types.h>
23
24 /* A.1 MS Class-Specific Interface Descriptor Subtypes */
25 #define USB_MS_HEADER 0x01
26 #define USB_MS_MIDI_IN_JACK 0x02
27 #define USB_MS_MIDI_OUT_JACK 0x03
28 #define USB_MS_ELEMENT 0x04
29
30 /* A.2 MS Class-Specific Endpoint Descriptor Subtypes */
31 #define USB_MS_GENERAL 0x01
32
33 /* A.3 MS MIDI IN and OUT Jack Types */
34 #define USB_MS_EMBEDDED 0x01
35 #define USB_MS_EXTERNAL 0x02
36
37 /* 6.1.2.1 Class-Specific MS Interface Header Descriptor */
38 struct usb_ms_header_descriptor {
39 __u8 bLength;
40 __u8 bDescriptorType;
41 __u8 bDescriptorSubtype;
42 __le16 bcdMSC;
43 __le16 wTotalLength;
44 } __attribute__ ((packed));
45
46 #define USB_DT_MS_HEADER_SIZE 7
47
48 /* 6.1.2.2 MIDI IN Jack Descriptor */
49 struct usb_midi_in_jack_descriptor {
50 __u8 bLength;
51 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
52 __u8 bDescriptorSubtype; /* USB_MS_MIDI_IN_JACK */
53 __u8 bJackType; /* USB_MS_EMBEDDED/EXTERNAL */
54 __u8 bJackID;
55 __u8 iJack;
56 } __attribute__ ((packed));
57
58 #define USB_DT_MIDI_IN_SIZE 6
59
60 struct usb_midi_source_pin {
61 __u8 baSourceID;
62 __u8 baSourcePin;
63 } __attribute__ ((packed));
64
65 /* 6.1.2.3 MIDI OUT Jack Descriptor */
66 struct usb_midi_out_jack_descriptor {
67 __u8 bLength;
68 __u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
69 __u8 bDescriptorSubtype; /* USB_MS_MIDI_OUT_JACK */
70 __u8 bJackType; /* USB_MS_EMBEDDED/EXTERNAL */
71 __u8 bJackID;
72 __u8 bNrInputPins; /* p */
73 struct usb_midi_source_pin pins[]; /* [p] */
74 /*__u8 iJack; -- omitted due to variable-sized pins[] */
75 } __attribute__ ((packed));
76
77 #define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p))
78
79 /* As above, but more useful for defining your own descriptors: */
80 #define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \
81 struct usb_midi_out_jack_descriptor_##p { \
82 __u8 bLength; \
83 __u8 bDescriptorType; \
84 __u8 bDescriptorSubtype; \
85 __u8 bJackType; \
86 __u8 bJackID; \
87 __u8 bNrInputPins; \
88 struct usb_midi_source_pin pins[p]; \
89 __u8 iJack; \
90 } __attribute__ ((packed))
91
92 /* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */
93 struct usb_ms_endpoint_descriptor {
94 __u8 bLength; /* 4+n */
95 __u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */
96 __u8 bDescriptorSubtype; /* USB_MS_GENERAL */
97 __u8 bNumEmbMIDIJack; /* n */
98 __u8 baAssocJackID[]; /* [n] */
99 } __attribute__ ((packed));
100
101 #define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n))
102
103 /* As above, but more useful for defining your own descriptors: */
104 #define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \
105 struct usb_ms_endpoint_descriptor_##n { \
106 __u8 bLength; \
107 __u8 bDescriptorType; \
108 __u8 bDescriptorSubtype; \
109 __u8 bNumEmbMIDIJack; \
110 __u8 baAssocJackID[n]; \
111 } __attribute__ ((packed))
112
113 #endif /* __LINUX_USB_MIDI_H */