Critics have remarked that those four worthies were truly peerless throughout the ages; yet the present falls short of the past—the ancients favored unadorned simplicity, whereas the moderns prefer refined elegance. Styles of substance and ornament rise and fall in succession, shifting with the changing mores of the times; such evolution is simply the natural order of things. The ideal lies in honoring antiquity without clashing with the present, and embracing modernity without succumbing to its flaws—embodying that perfect balance of substance and refinement that defines the true gentleman. There is surely no need to abandon a carved palace in favor of a cave dwelling, or to trade a jade carriage for a primitive cart with solid wooden wheels.🌌 SpectraShell

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Current path: usr/include/linux/


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📄 Viewing: ppdev.h

/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * linux/include/linux/ppdev.h
 *
 * User-space parallel port device driver (header file).
 *
 * Copyright (C) 1998-9 Tim Waugh <tim@cyberelk.demon.co.uk>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Added PPGETTIME/PPSETTIME, Fred Barnes, 1999
 * Added PPGETMODES/PPGETMODE/PPGETPHASE, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001
 */

#define PP_IOCTL	'p'

/* Set mode for read/write (e.g. IEEE1284_MODE_EPP) */
#define PPSETMODE	_IOW(PP_IOCTL, 0x80, int)

/* Read status */
#define PPRSTATUS	_IOR(PP_IOCTL, 0x81, unsigned char)
#define PPWSTATUS	OBSOLETE__IOW(PP_IOCTL, 0x82, unsigned char)

/* Read/write control */
#define PPRCONTROL	_IOR(PP_IOCTL, 0x83, unsigned char)
#define PPWCONTROL	_IOW(PP_IOCTL, 0x84, unsigned char)

struct ppdev_frob_struct {
	unsigned char mask;
	unsigned char val;
};
#define PPFCONTROL      _IOW(PP_IOCTL, 0x8e, struct ppdev_frob_struct)

/* Read/write data */
#define PPRDATA		_IOR(PP_IOCTL, 0x85, unsigned char)
#define PPWDATA		_IOW(PP_IOCTL, 0x86, unsigned char)

/* Read/write econtrol (not used) */
#define PPRECONTROL	OBSOLETE__IOR(PP_IOCTL, 0x87, unsigned char)
#define PPWECONTROL	OBSOLETE__IOW(PP_IOCTL, 0x88, unsigned char)

/* Read/write FIFO (not used) */
#define PPRFIFO		OBSOLETE__IOR(PP_IOCTL, 0x89, unsigned char)
#define PPWFIFO		OBSOLETE__IOW(PP_IOCTL, 0x8a, unsigned char)

/* Claim the port to start using it */
#define PPCLAIM		_IO(PP_IOCTL, 0x8b)

/* Release the port when you aren't using it */
#define PPRELEASE	_IO(PP_IOCTL, 0x8c)

/* Yield the port (release it if another driver is waiting,
 * then reclaim) */
#define PPYIELD		_IO(PP_IOCTL, 0x8d)

/* Register device exclusively (must be before PPCLAIM). */
#define PPEXCL		_IO(PP_IOCTL, 0x8f)

/* Data line direction: non-zero for input mode. */
#define PPDATADIR	_IOW(PP_IOCTL, 0x90, int)

/* Negotiate a particular IEEE 1284 mode. */
#define PPNEGOT		_IOW(PP_IOCTL, 0x91, int)

/* Set control lines when an interrupt occurs. */
#define PPWCTLONIRQ	_IOW(PP_IOCTL, 0x92, unsigned char)

/* Clear (and return) interrupt count. */
#define PPCLRIRQ	_IOR(PP_IOCTL, 0x93, int)

/* Set the IEEE 1284 phase that we're in (e.g. IEEE1284_PH_FWD_IDLE) */
#define PPSETPHASE	_IOW(PP_IOCTL, 0x94, int)

/* Set and get port timeout (struct timeval's) */
#define PPGETTIME	_IOR(PP_IOCTL, 0x95, struct timeval)
#define PPSETTIME	_IOW(PP_IOCTL, 0x96, struct timeval)

/* Get available modes (what the hardware can do) */
#define PPGETMODES	_IOR(PP_IOCTL, 0x97, unsigned int)

/* Get the current mode and phaze */
#define PPGETMODE	_IOR(PP_IOCTL, 0x98, int)
#define PPGETPHASE	_IOR(PP_IOCTL, 0x99, int)

/* get/set flags */
#define PPGETFLAGS	_IOR(PP_IOCTL, 0x9a, int)
#define PPSETFLAGS	_IOW(PP_IOCTL, 0x9b, int)

/* flags visible to the world */
#define PP_FASTWRITE	(1<<2)
#define PP_FASTREAD	(1<<3)
#define PP_W91284PIC	(1<<4)

/* only masks user-visible flags */
#define PP_FLAGMASK	(PP_FASTWRITE | PP_FASTREAD | PP_W91284PIC)

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