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/tmc.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Copyright (C) 2007 Stefan Kopp, Gechingen, Germany
 * Copyright (C) 2008 Novell, Inc.
 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
 * Copyright (C) 2015 Dave Penkler <dpenkler@gmail.com>
 * Copyright (C) 2018 IVI Foundation, Inc.
 *
 * This file holds USB constants defined by the USB Device Class
 * and USB488 Subclass Definitions for Test and Measurement devices
 * published by the USB-IF.
 *
 * It also has the ioctl and capability definitions for the
 * usbtmc kernel driver that userspace needs to know about.
 */

#ifndef __LINUX_USB_TMC_H
#define __LINUX_USB_TMC_H

#include <linux/types.h>   /* __u8 etc */

/* USB TMC status values */
#define USBTMC_STATUS_SUCCESS				0x01
#define USBTMC_STATUS_PENDING				0x02
#define USBTMC_STATUS_FAILED				0x80
#define USBTMC_STATUS_TRANSFER_NOT_IN_PROGRESS		0x81
#define USBTMC_STATUS_SPLIT_NOT_IN_PROGRESS		0x82
#define USBTMC_STATUS_SPLIT_IN_PROGRESS			0x83

/* USB TMC requests values */
#define USBTMC_REQUEST_INITIATE_ABORT_BULK_OUT		1
#define USBTMC_REQUEST_CHECK_ABORT_BULK_OUT_STATUS	2
#define USBTMC_REQUEST_INITIATE_ABORT_BULK_IN		3
#define USBTMC_REQUEST_CHECK_ABORT_BULK_IN_STATUS	4
#define USBTMC_REQUEST_INITIATE_CLEAR			5
#define USBTMC_REQUEST_CHECK_CLEAR_STATUS		6
#define USBTMC_REQUEST_GET_CAPABILITIES			7
#define USBTMC_REQUEST_INDICATOR_PULSE			64
#define USBTMC488_REQUEST_READ_STATUS_BYTE		128
#define USBTMC488_REQUEST_REN_CONTROL			160
#define USBTMC488_REQUEST_GOTO_LOCAL			161
#define USBTMC488_REQUEST_LOCAL_LOCKOUT			162

struct usbtmc_request {
	__u8 bRequestType;
	__u8 bRequest;
	__u16 wValue;
	__u16 wIndex;
	__u16 wLength;
} __attribute__ ((packed));

struct usbtmc_ctrlrequest {
	struct usbtmc_request req;
	void *data; /* pointer to user space */
} __attribute__ ((packed));

struct usbtmc_termchar {
	__u8 term_char;
	__u8 term_char_enabled;
} __attribute__ ((packed));

/*
 * usbtmc_message->flags:
 */
#define USBTMC_FLAG_ASYNC		0x0001
#define USBTMC_FLAG_APPEND		0x0002
#define USBTMC_FLAG_IGNORE_TRAILER	0x0004

struct usbtmc_message {
	__u32 transfer_size; /* size of bytes to transfer */
	__u32 transferred; /* size of received/written bytes */
	__u32 flags; /* bit 0: 0 = synchronous; 1 = asynchronous */
	void *message; /* pointer to header and data in user space */
} __attribute__ ((packed));

/* Request values for USBTMC driver's ioctl entry point */
#define USBTMC_IOC_NR			91
#define USBTMC_IOCTL_INDICATOR_PULSE	_IO(USBTMC_IOC_NR, 1)
#define USBTMC_IOCTL_CLEAR		_IO(USBTMC_IOC_NR, 2)
#define USBTMC_IOCTL_ABORT_BULK_OUT	_IO(USBTMC_IOC_NR, 3)
#define USBTMC_IOCTL_ABORT_BULK_IN	_IO(USBTMC_IOC_NR, 4)
#define USBTMC_IOCTL_CLEAR_OUT_HALT	_IO(USBTMC_IOC_NR, 6)
#define USBTMC_IOCTL_CLEAR_IN_HALT	_IO(USBTMC_IOC_NR, 7)
#define USBTMC_IOCTL_CTRL_REQUEST	_IOWR(USBTMC_IOC_NR, 8, struct usbtmc_ctrlrequest)
#define USBTMC_IOCTL_GET_TIMEOUT	_IOR(USBTMC_IOC_NR, 9, __u32)
#define USBTMC_IOCTL_SET_TIMEOUT	_IOW(USBTMC_IOC_NR, 10, __u32)
#define USBTMC_IOCTL_EOM_ENABLE	        _IOW(USBTMC_IOC_NR, 11, __u8)
#define USBTMC_IOCTL_CONFIG_TERMCHAR	_IOW(USBTMC_IOC_NR, 12, struct usbtmc_termchar)
#define USBTMC_IOCTL_WRITE		_IOWR(USBTMC_IOC_NR, 13, struct usbtmc_message)
#define USBTMC_IOCTL_READ		_IOWR(USBTMC_IOC_NR, 14, struct usbtmc_message)
#define USBTMC_IOCTL_WRITE_RESULT	_IOWR(USBTMC_IOC_NR, 15, __u32)
#define USBTMC_IOCTL_API_VERSION	_IOR(USBTMC_IOC_NR, 16, __u32)

#define USBTMC488_IOCTL_GET_CAPS	_IOR(USBTMC_IOC_NR, 17, unsigned char)
#define USBTMC488_IOCTL_READ_STB	_IOR(USBTMC_IOC_NR, 18, unsigned char)
#define USBTMC488_IOCTL_REN_CONTROL	_IOW(USBTMC_IOC_NR, 19, unsigned char)
#define USBTMC488_IOCTL_GOTO_LOCAL	_IO(USBTMC_IOC_NR, 20)
#define USBTMC488_IOCTL_LOCAL_LOCKOUT	_IO(USBTMC_IOC_NR, 21)
#define USBTMC488_IOCTL_TRIGGER		_IO(USBTMC_IOC_NR, 22)
#define USBTMC488_IOCTL_WAIT_SRQ	_IOW(USBTMC_IOC_NR, 23, __u32)

#define USBTMC_IOCTL_MSG_IN_ATTR	_IOR(USBTMC_IOC_NR, 24, __u8)
#define USBTMC_IOCTL_AUTO_ABORT		_IOW(USBTMC_IOC_NR, 25, __u8)

#define USBTMC_IOCTL_GET_STB            _IOR(USBTMC_IOC_NR, 26, __u8)
#define USBTMC_IOCTL_GET_SRQ_STB        _IOR(USBTMC_IOC_NR, 27, __u8)

/* Cancel and cleanup asynchronous calls */
#define USBTMC_IOCTL_CANCEL_IO		_IO(USBTMC_IOC_NR, 35)
#define USBTMC_IOCTL_CLEANUP_IO		_IO(USBTMC_IOC_NR, 36)

/* Driver encoded usb488 capabilities */
#define USBTMC488_CAPABILITY_TRIGGER         1
#define USBTMC488_CAPABILITY_SIMPLE          2
#define USBTMC488_CAPABILITY_REN_CONTROL     2
#define USBTMC488_CAPABILITY_GOTO_LOCAL      2
#define USBTMC488_CAPABILITY_LOCAL_LOCKOUT   2
#define USBTMC488_CAPABILITY_488_DOT_2       4
#define USBTMC488_CAPABILITY_DT1             16
#define USBTMC488_CAPABILITY_RL1             32
#define USBTMC488_CAPABILITY_SR1             64
#define USBTMC488_CAPABILITY_FULL_SCPI       128

#endif

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