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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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* <linux/usb/midi.h> -- USB MIDI definitions.

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* Developed for Thumtronics by Grey Innovation

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* Ben Williamson <ben.williamson@greyinnovation.com>

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* This software is distributed under the terms of the GNU General Public

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* License ("GPL") version 2, as published by the Free Software Foundation.

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* This file holds USB constants and structures defined

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* by the USB Device Class Definition for MIDI Devices.

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* Comments below reference relevant sections of that document:

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* http://www.usb.org/developers/devclass_docs/midi10.pdf

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#ifndef __LINUX_USB_MIDI_H

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#define __LINUX_USB_MIDI_H

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#include <linux/types.h>

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/* A.1 MS Class-Specific Interface Descriptor Subtypes */

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#define USB_MS_HEADER 0x01

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#define USB_MS_MIDI_IN_JACK 0x02

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#define USB_MS_MIDI_OUT_JACK 0x03

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#define USB_MS_ELEMENT 0x04

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/* A.2 MS Class-Specific Endpoint Descriptor Subtypes */

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#define USB_MS_GENERAL 0x01

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/* A.3 MS MIDI IN and OUT Jack Types */

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#define USB_MS_EMBEDDED 0x01

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#define USB_MS_EXTERNAL 0x02

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/* 6.1.2.1 Class-Specific MS Interface Header Descriptor */

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struct usb_ms_header_descriptor {

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__u8 bLength;

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__u8 bDescriptorType;

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__u8 bDescriptorSubtype;

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__le16 bcdMSC;

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__le16 wTotalLength;

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} __attribute__ ((packed));

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#define USB_DT_MS_HEADER_SIZE 7

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/* 6.1.2.2 MIDI IN Jack Descriptor */

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struct usb_midi_in_jack_descriptor {

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__u8 bLength;

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__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */

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__u8 bDescriptorSubtype; /* USB_MS_MIDI_IN_JACK */

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__u8 bJackType; /* USB_MS_EMBEDDED/EXTERNAL */

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__u8 bJackID;

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__u8 iJack;

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} __attribute__ ((packed));

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#define USB_DT_MIDI_IN_SIZE 6

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struct usb_midi_source_pin {

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__u8 baSourceID;

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__u8 baSourcePin;

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} __attribute__ ((packed));

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/* 6.1.2.3 MIDI OUT Jack Descriptor */

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struct usb_midi_out_jack_descriptor {

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__u8 bLength;

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__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */

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__u8 bDescriptorSubtype; /* USB_MS_MIDI_OUT_JACK */

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__u8 bJackType; /* USB_MS_EMBEDDED/EXTERNAL */

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__u8 bJackID;

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__u8 bNrInputPins; /* p */

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struct usb_midi_source_pin pins[]; /* [p] */

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/*__u8 iJack; -- omitted due to variable-sized pins[] */

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} __attribute__ ((packed));

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#define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p))

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/* As above, but more useful for defining your own descriptors: */

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#define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \

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struct usb_midi_out_jack_descriptor_##p { \

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__u8 bLength; \

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__u8 bDescriptorType; \

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__u8 bDescriptorSubtype; \

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__u8 bJackType; \

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__u8 bJackID; \

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__u8 bNrInputPins; \

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struct usb_midi_source_pin pins[p]; \

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__u8 iJack; \

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} __attribute__ ((packed))

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/* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */

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struct usb_ms_endpoint_descriptor {

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__u8 bLength; /* 4+n */

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__u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */

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__u8 bDescriptorSubtype; /* USB_MS_GENERAL */

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__u8 bNumEmbMIDIJack; /* n */

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__u8 baAssocJackID[]; /* [n] */

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} __attribute__ ((packed));

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#define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n))

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/* As above, but more useful for defining your own descriptors: */

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#define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \

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struct usb_ms_endpoint_descriptor_##n { \

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__u8 bLength; \

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__u8 bDescriptorType; \

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__u8 bDescriptorSubtype; \

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__u8 bNumEmbMIDIJack; \

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__u8 baAssocJackID[n]; \

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} __attribute__ ((packed))

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#endif /* __LINUX_USB_MIDI_H */

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