kernel-ark/include/linux/usb/midi.h
Ben Williamson f2ebf92c9e 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>
2006-09-27 11:58:52 -07:00

113 lines
3.2 KiB
C

/*
* <linux/usb/midi.h> -- USB MIDI definitions.
*
* Copyright (C) 2006 Thumtronics Pty Ltd.
* Developed for Thumtronics by Grey Innovation
* Ben Williamson <ben.williamson@greyinnovation.com>
*
* This software is distributed under the terms of the GNU General Public
* License ("GPL") version 2, as published by the Free Software Foundation.
*
* This file holds USB constants and structures defined
* by the USB Device Class Definition for MIDI Devices.
* Comments below reference relevant sections of that document:
*
* http://www.usb.org/developers/devclass_docs/midi10.pdf
*/
#ifndef __LINUX_USB_MIDI_H
#define __LINUX_USB_MIDI_H
#include <linux/types.h>
/* A.1 MS Class-Specific Interface Descriptor Subtypes */
#define USB_MS_HEADER 0x01
#define USB_MS_MIDI_IN_JACK 0x02
#define USB_MS_MIDI_OUT_JACK 0x03
#define USB_MS_ELEMENT 0x04
/* A.2 MS Class-Specific Endpoint Descriptor Subtypes */
#define USB_MS_GENERAL 0x01
/* A.3 MS MIDI IN and OUT Jack Types */
#define USB_MS_EMBEDDED 0x01
#define USB_MS_EXTERNAL 0x02
/* 6.1.2.1 Class-Specific MS Interface Header Descriptor */
struct usb_ms_header_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubtype;
__le16 bcdMSC;
__le16 wTotalLength;
} __attribute__ ((packed));
#define USB_DT_MS_HEADER_SIZE 7
/* 6.1.2.2 MIDI IN Jack Descriptor */
struct usb_midi_in_jack_descriptor {
__u8 bLength;
__u8 bDescriptorType; // USB_DT_CS_INTERFACE
__u8 bDescriptorSubtype; // USB_MS_MIDI_IN_JACK
__u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
__u8 bJackID;
__u8 iJack;
} __attribute__ ((packed));
#define USB_DT_MIDI_IN_SIZE 6
struct usb_midi_source_pin {
__u8 baSourceID;
__u8 baSourcePin;
} __attribute__ ((packed));
/* 6.1.2.3 MIDI OUT Jack Descriptor */
struct usb_midi_out_jack_descriptor {
__u8 bLength;
__u8 bDescriptorType; // USB_DT_CS_INTERFACE
__u8 bDescriptorSubtype; // USB_MS_MIDI_OUT_JACK
__u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
__u8 bJackID;
__u8 bNrInputPins; // p
struct usb_midi_source_pin pins[]; // [p]
/*__u8 iJack; -- ommitted due to variable-sized pins[] */
} __attribute__ ((packed));
#define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p))
/* As above, but more useful for defining your own descriptors: */
#define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \
struct usb_midi_out_jack_descriptor_##p { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubtype; \
__u8 bJackType; \
__u8 bJackID; \
__u8 bNrInputPins; \
struct usb_midi_source_pin pins[p]; \
__u8 iJack; \
} __attribute__ ((packed))
/* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */
struct usb_ms_endpoint_descriptor {
__u8 bLength; // 4+n
__u8 bDescriptorType; // USB_DT_CS_ENDPOINT
__u8 bDescriptorSubtype; // USB_MS_GENERAL
__u8 bNumEmbMIDIJack; // n
__u8 baAssocJackID[]; // [n]
} __attribute__ ((packed));
#define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n))
/* As above, but more useful for defining your own descriptors: */
#define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \
struct usb_ms_endpoint_descriptor_##n { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubtype; \
__u8 bNumEmbMIDIJack; \
__u8 baAssocJackID[n]; \
} __attribute__ ((packed))
#endif