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authorBen Williamson <ben.williamson@greyinnovation.com>2006-07-31 21:28:16 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-27 14:58:52 -0400
commitf2ebf92c9e1930a8f79b7eb49a32122931929014 (patch)
tree814cf172c1baa7e3d9990224b50148f50e537b33 /include/linux/usb
parentba307f5828b1b4a1348d99c4f430a0cf3beeae2f (diff)
USB: gmidi: New USB MIDI Gadget class driver.
This driver is glue between the USB gadget interface and the ALSA MIDI interface. It allows us to appear as a MIDI Streaming device to a host system on the other end of a USB cable. This includes linux/usb/audio.h and linux/usb/midi.h containing definitions from the relevant USB specifications for USB audio and USB MIDI devices. The following changes have been made since the first RFC posting: * Bug fixes to endpoint handling. * Workaround for USB_REQ_SET_CONFIGURATION handling, not understood yet. * Added SND and SND_RAWMIDI dependencies in Kconfig. * Moved usb_audio.h and usb_midi.h to usb/*.h * Added module parameters for ALSA card index and id. * Added module parameters for USB descriptor IDs and strings. * Removed some unneeded stuff inherited from zero.c, more to go. * Provide DECLARE_* macros for the variable-length structs. * Use kmalloc instead of usb_ep_alloc_buffer. * Limit source to 80 columns. * Return actual error code instead of -ENOMEM in a few places. Signed-off-by: Ben Williamson <ben.williamson@greyinnovation.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/audio.h53
-rw-r--r--include/linux/usb/midi.h112
2 files changed, 165 insertions, 0 deletions
diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
new file mode 100644
index 0000000000..6bd235994d
--- /dev/null
+++ b/include/linux/usb/audio.h
@@ -0,0 +1,53 @@
1/*
2 * <linux/usb/audio.h> -- USB Audio definitions.
3 *
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
7 *
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.
10 *
11 * This file holds USB constants and structures defined
12 * by the USB Device Class Definition for Audio Devices.
13 * Comments below reference relevant sections of that document:
14 *
15 * http://www.usb.org/developers/devclass_docs/audio10.pdf
16 */
17
18#ifndef __LINUX_USB_AUDIO_H
19#define __LINUX_USB_AUDIO_H
20
21#include <linux/types.h>
22
23/* A.2 Audio Interface Subclass Codes */
24#define USB_SUBCLASS_AUDIOCONTROL 0x01
25#define USB_SUBCLASS_AUDIOSTREAMING 0x02
26#define USB_SUBCLASS_MIDISTREAMING 0x03
27
28/* 4.3.2 Class-Specific AC Interface Descriptor */
29struct usb_ac_header_descriptor {
30 __u8 bLength; // 8+n
31 __u8 bDescriptorType; // USB_DT_CS_INTERFACE
32 __u8 bDescriptorSubtype; // USB_MS_HEADER
33 __le16 bcdADC; // 0x0100
34 __le16 wTotalLength; // includes Unit and Terminal desc.
35 __u8 bInCollection; // n
36 __u8 baInterfaceNr[]; // [n]
37} __attribute__ ((packed));
38
39#define USB_DT_AC_HEADER_SIZE(n) (8+(n))
40
41/* As above, but more useful for defining your own descriptors: */
42#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) \
43struct usb_ac_header_descriptor_##n { \
44 __u8 bLength; \
45 __u8 bDescriptorType; \
46 __u8 bDescriptorSubtype; \
47 __le16 bcdADC; \
48 __le16 wTotalLength; \
49 __u8 bInCollection; \
50 __u8 baInterfaceNr[n]; \
51} __attribute__ ((packed))
52
53#endif
diff --git a/include/linux/usb/midi.h b/include/linux/usb/midi.h
new file mode 100644
index 0000000000..11a97d5ffd
--- /dev/null
+++ b/include/linux/usb/midi.h
@@ -0,0 +1,112 @@
1/*
2 * <linux/usb/midi.h> -- USB MIDI definitions.
3 *
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
7 *
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.
10 *
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:
14 *
15 * http://www.usb.org/developers/devclass_docs/midi10.pdf
16 */
17
18#ifndef __LINUX_USB_MIDI_H
19#define __LINUX_USB_MIDI_H
20
21#include <linux/types.h>
22
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
28
29/* A.2 MS Class-Specific Endpoint Descriptor Subtypes */
30#define USB_MS_GENERAL 0x01
31
32/* A.3 MS MIDI IN and OUT Jack Types */
33#define USB_MS_EMBEDDED 0x01
34#define USB_MS_EXTERNAL 0x02
35
36/* 6.1.2.1 Class-Specific MS Interface Header Descriptor */
37struct usb_ms_header_descriptor {
38 __u8 bLength;
39 __u8 bDescriptorType;
40 __u8 bDescriptorSubtype;
41 __le16 bcdMSC;
42 __le16 wTotalLength;
43} __attribute__ ((packed));
44
45#define USB_DT_MS_HEADER_SIZE 7
46
47/* 6.1.2.2 MIDI IN Jack Descriptor */
48struct usb_midi_in_jack_descriptor {
49 __u8 bLength;
50 __u8 bDescriptorType; // USB_DT_CS_INTERFACE
51 __u8 bDescriptorSubtype; // USB_MS_MIDI_IN_JACK
52 __u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
53 __u8 bJackID;
54 __u8 iJack;
55} __attribute__ ((packed));
56
57#define USB_DT_MIDI_IN_SIZE 6
58
59struct usb_midi_source_pin {
60 __u8 baSourceID;
61 __u8 baSourcePin;
62} __attribute__ ((packed));
63
64/* 6.1.2.3 MIDI OUT Jack Descriptor */
65struct usb_midi_out_jack_descriptor {
66 __u8 bLength;
67 __u8 bDescriptorType; // USB_DT_CS_INTERFACE
68 __u8 bDescriptorSubtype; // USB_MS_MIDI_OUT_JACK
69 __u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
70 __u8 bJackID;
71 __u8 bNrInputPins; // p
72 struct usb_midi_source_pin pins[]; // [p]
73 /*__u8 iJack; -- ommitted due to variable-sized pins[] */
74} __attribute__ ((packed));
75
76#define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p))
77
78/* As above, but more useful for defining your own descriptors: */
79#define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \
80struct usb_midi_out_jack_descriptor_##p { \
81 __u8 bLength; \
82 __u8 bDescriptorType; \
83 __u8 bDescriptorSubtype; \
84 __u8 bJackType; \
85 __u8 bJackID; \
86 __u8 bNrInputPins; \
87 struct usb_midi_source_pin pins[p]; \
88 __u8 iJack; \
89} __attribute__ ((packed))
90
91/* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */
92struct usb_ms_endpoint_descriptor {
93 __u8 bLength; // 4+n
94 __u8 bDescriptorType; // USB_DT_CS_ENDPOINT
95 __u8 bDescriptorSubtype; // USB_MS_GENERAL
96 __u8 bNumEmbMIDIJack; // n
97 __u8 baAssocJackID[]; // [n]
98} __attribute__ ((packed));
99
100#define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n))
101
102/* As above, but more useful for defining your own descriptors: */
103#define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \
104struct usb_ms_endpoint_descriptor_##n { \
105 __u8 bLength; \
106 __u8 bDescriptorType; \
107 __u8 bDescriptorSubtype; \
108 __u8 bNumEmbMIDIJack; \
109 __u8 baAssocJackID[n]; \
110} __attribute__ ((packed))
111
112#endif
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