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