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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* <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; -- omitted 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 /* __LINUX_USB_MIDI_H */