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。 sh-3ll

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *   Focusrite Scarlett 2 Protocol Driver for ALSA
 *   (including Scarlett 2nd Gen, 3rd Gen, 4th Gen, Clarett USB, and
 *   Clarett+ series products)
 *
 *   Copyright (c) 2023 by Geoffrey D. Bennett <g at b4.vu>
 */
#ifndef __UAPI_SOUND_SCARLETT2_H
#define __UAPI_SOUND_SCARLETT2_H

#include <linux/types.h>
#include <linux/ioctl.h>

#define SCARLETT2_HWDEP_MAJOR 1
#define SCARLETT2_HWDEP_MINOR 0
#define SCARLETT2_HWDEP_SUBMINOR 0

#define SCARLETT2_HWDEP_VERSION \
	((SCARLETT2_HWDEP_MAJOR << 16) | \
	 (SCARLETT2_HWDEP_MINOR << 8) | \
	  SCARLETT2_HWDEP_SUBMINOR)

#define SCARLETT2_HWDEP_VERSION_MAJOR(v) (((v) >> 16) & 0xFF)
#define SCARLETT2_HWDEP_VERSION_MINOR(v) (((v) >> 8) & 0xFF)
#define SCARLETT2_HWDEP_VERSION_SUBMINOR(v) ((v) & 0xFF)

/* Get protocol version */
#define SCARLETT2_IOCTL_PVERSION _IOR('S', 0x60, int)

/* Reboot */
#define SCARLETT2_IOCTL_REBOOT _IO('S', 0x61)

/* Select flash segment */
#define SCARLETT2_SEGMENT_ID_SETTINGS 0
#define SCARLETT2_SEGMENT_ID_FIRMWARE 1
#define SCARLETT2_SEGMENT_ID_COUNT 2

#define SCARLETT2_IOCTL_SELECT_FLASH_SEGMENT _IOW('S', 0x62, int)

/* Erase selected flash segment */
#define SCARLETT2_IOCTL_ERASE_FLASH_SEGMENT _IO('S', 0x63)

/* Get selected flash segment erase progress
 * 1 through to num_blocks, or 255 for complete
 */
struct scarlett2_flash_segment_erase_progress {
	unsigned char progress;
	unsigned char num_blocks;
};
#define SCARLETT2_IOCTL_GET_ERASE_PROGRESS \
	_IOR('S', 0x64, struct scarlett2_flash_segment_erase_progress)

#endif /* __UAPI_SOUND_SCARLETT2_H */