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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102/* SPDX-License-Identifier: GPL-2.0 *//* * usr/include/linux/lp.h c.1991-1992 James Wiegand * many modifications copyright (C) 1992 Michael K. Johnson * Interrupt support added 1993 Nigel Gamble * Removed 8255 status defines from inside __KERNEL__ Marcelo Tosatti */#ifndef _LINUX_LP_H#define _LINUX_LP_H
#include <linux/wait.h>#include <linux/mutex.h>#include <uapi/linux/lp.h>
/* Magic numbers for defining port-device mappings */#define LP_PARPORT_UNSPEC -4#define LP_PARPORT_AUTO -3#define LP_PARPORT_OFF -2#define LP_PARPORT_NONE -1
#define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */#define LP_CHAR(minor) lp_table[(minor)].chars /* busy timeout */#define LP_TIME(minor) lp_table[(minor)].time /* wait time */#define LP_WAIT(minor) lp_table[(minor)].wait /* strobe wait */#define LP_IRQ(minor) lp_table[(minor)].dev->port->irq /* interrupt # */ /* PARPORT_IRQ_NONE means polled */#ifdef LP_STATS#define LP_STAT(minor) lp_table[(minor)].stats /* statistics area */#endif#define LP_BUFFER_SIZE PAGE_SIZE
#define LP_BASE(x) lp_table[(x)].dev->port->base
#ifdef LP_STATSstruct lp_stats { unsigned long chars; unsigned long sleeps; unsigned int maxrun; unsigned int maxwait; unsigned int meanwait; unsigned int mdev;};#endif
struct lp_struct { struct pardevice *dev; unsigned long flags; unsigned int chars; unsigned int time; unsigned int wait; char *lp_buffer;#ifdef LP_STATS unsigned int lastcall; unsigned int runchars; struct lp_stats stats;#endif wait_queue_head_t waitq; unsigned int last_error; struct mutex port_mutex; wait_queue_head_t dataq; long timeout; unsigned int best_mode; unsigned int current_mode; unsigned long bits;};
/* * The following constants describe the various signals of the printer port * hardware. Note that the hardware inverts some signals and that some * signals are active low. An example is LP_STROBE, which must be programmed * with 1 for being active and 0 for being inactive, because the strobe signal * gets inverted, but it is also active low. */
/* * defines for 8255 control port * base + 2 * accessed with LP_C(minor) */#define LP_PINTEN 0x10 /* high to read data in or-ed with data out */#define LP_PSELECP 0x08 /* inverted output, active low */#define LP_PINITP 0x04 /* unchanged output, active low */#define LP_PAUTOLF 0x02 /* inverted output, active low */#define LP_PSTROBE 0x01 /* short high output on raising edge */
/* * the value written to ports to test existence. PC-style ports will * return the value written. AT-style ports will return 0. so why not * make them the same ? */#define LP_DUMMY 0x00
/* * This is the port delay time, in microseconds. * It is used only in the lp_init() and lp_reset() routine. */#define LP_DELAY 50
#endif