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