139 lines
4.1 KiB
C
139 lines
4.1 KiB
C
#ifndef _LINUX_LP_H
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#define _LINUX_LP_H
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/io.h>
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#include <asm/segment.h>
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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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*/
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/*
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* caveat: my machine only has 1 printer @ lpt2 so lpt1 & lpt3 are
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* implemented but UNTESTED
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*
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* My machine (Michael K. Johnson) has only lpt1... dupla caveat...
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*/
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/*
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* Per POSIX guidelines, this module reserves the LP and lp prefixes
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* These are the lp_table[minor].flags flags...
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*/
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#define LP_EXIST 0x0001
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#define LP_SELEC 0x0002
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#define LP_BUSY 0x0004
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#define LP_OFFL 0x0008
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#define LP_NOPA 0x0010
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#define LP_ERR 0x0020
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/* timeout for each character (This is a good case 50 Mhz computer
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at a poor case 10 KBS xfer rate to the printer, as best as I can
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tell.) This is in instruction cycles, kinda -- it is the count
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in a busy loop. THIS IS THE VALUE TO CHANGE if you have extremely
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slow printing, or if the machine seems to slow down a lot when you
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print. If you have slow printing, increase this number and recompile,
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and if your system gets bogged down, decrease this number.*/
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#define LP_TIME_CHAR 5000
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/* timeout for printk'ing a timeout, in jiffies (100ths of a second).
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If your printer isn't printing at least one character every five seconds,
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you have worse problems than a slow printer driver and lp_timeout printed
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every five seconds while trying to print. */
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#define LP_TIMEOUT 5000
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#define LP_B(minor) lp_table[(minor)].base /* IO address */
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#define LP_F(minor) lp_table[(minor)].flags /* flags for busy, etc. */
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#define LP_S(minor) inb(LP_B((minor)) + 1) /* status port */
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#define LP_C(minor) (lp_table[(minor)].base + 2) /* control port */
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#define LP_COUNT(minor) lp_table[(minor)].count /* last count */
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#define LP_TIME(minor) lp_table[(minor)].time /* last time */
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/*
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since we are dealing with a horribly slow device
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I don't see the need for a queue
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*/
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struct lp_struct {
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int base;
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int flags;
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int count;
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int time;
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};
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/* This is the starting value for the heuristic algorithm. If you
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* want to tune this and have a fast printer (i.e. HPIIIP), decrease
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* this number, and if you have a slow printer, increase this number.
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* This is not stricly necessary, as the algorithm should be able to
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* adapt to your printer relatively quickly.
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* this is in hundredths of a second, the default 50 being .5 seconds.
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*/
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#define LP_INIT_TIME 50
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/* This is our first guess at the size of the buffer on the printer,
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* in characters. I am assuming a 4K buffer because most newer printers
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* have larger ones, which will be adapted to. At this time, it really
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* doesn't matter, as this value isn't used.
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*/
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#define LP_INIT_COUNT 4096
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/* the BIOS manuals say there can be up to 4 lpt devices
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* but I have not seen a board where the 4th address is listed
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* if you have different hardware change the table below
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* please let me know if you have different equipment
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* if you have more than 3 printers, remember to increase LP_NO
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*/
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struct lp_struct lp_table[] = {
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{ 0x3bc, 0, LP_INIT_COUNT, LP_INIT_TIME, },
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{ 0x378, 0, LP_INIT_COUNT, LP_INIT_TIME, },
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{ 0x278, 0, LP_INIT_COUNT, LP_INIT_TIME, }
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};
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#define LP_NO 3
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/*
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* bit defines for 8255 status port
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* base + 1
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* accessed with LP_S(minor), which gets the byte...
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*/
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#define LP_PBUSY 0x80 /* active low */
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#define LP_PACK 0x40 /* active low */
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#define LP_POUTPA 0x20
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#define LP_PSELECD 0x10
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#define LP_PERRORP 0x08 /* active low*/
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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_PSELECP 0x08
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#define LP_PINITP 0x04 /* active low */
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#define LP_PAUTOLF 0x02
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#define LP_PSTROBE 0x01
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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. Your mileage may vary.
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* It is used only in the lp_init() routine.
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*/
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#define LP_DELAY 150000
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/*
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* function prototypes
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*/
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extern long lp_init(long);
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#endif
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