晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/linux/usb/midi.h
/* 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 */

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