Chris Jones wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi
>
> Could someone point me at some docs for simple control of the parallel
> port?
>
>
THis is a bit messy since it uses some bits of RT Linux
Tidy it up thussly
Good luck.
If you find a description of the Parallel port Control reg mail me back
with it please.
Phil Wilshire
/* Parallel Port Example
Author: Phil Wilshire
Original: Many Others
Date: 4/23/99
$Id$
This code shows how to set up and use the parallel port
I have included an interrupt detector
*/
#include <linux/module.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <linux/cons.h>
#include <linux/sched.h>
#define LPT_PORT 0x378
#define LPTS 0x379
#define LPTC 0x37A
#define LPT_IRQ 7
#define PULSE_TIME 10000
#ifndef NULL
#define NULL 0
#endif
static int i;
static int irq_tries[] = {3,4,5,6,9,0};
static int irq_tried[] = {0,0,0,0,0};
static int got_irq;
void irq_handler(void) {
/* output a small pulse */
outb(inb_p(LPT_PORT) | (0x01) , LPT_PORT );
for ( i = 0 ; i < PULSE_TIME ; i++ ) ;
outb(inb_p(LPT_PORT) & ~(0x01) , LPT_PORT );
}
void dummy_probe(int irq, void * dev_id, struct pt_regs * regs) {
if ( got_irq == 0 ) got_irq = irq;
}
int init_module(void) {
int inbyte;
int i;
int count;
/* set up interrupt controller */
/*outb_p(inb_p(0x21)&(0x80),0x21);
outb_p(0x20,0x20); */
/* get all the irqs */
for ( i = 0; irq_tries[i] ; i++ ) {
irq_tried[i] = request_irq(irq_tries[i],dummy_probe,
SA_INTERRUPT, "dummy probe", NULL);
}
/* run the probe */
count = 0;
got_irq = 0;
do {
got_irq = 0;
outb_p(inb_p(LPTC)|(0x10),LPTC); /* enable */
outb(0x00, LPT_PORT ); /* low */
for ( i = 0 ; i < 10000 ; i++ );
outb(0xFF, LPT_PORT ); /* high */
for ( i = 0 ; i < 10000 ; i++ );
outb_p(inb_p(LPTC)&~(0x10),LPTC); /* disable */
if ( got_irq == 0 ) {
printk(" %d no irq reported ...\n",count);
}
count ++;
} while ( got_irq <= 0 && count < 5 );
printk(" got_irq reported %d...\n",got_irq);
/* enable port irqs */
return 0;
}
void cleanup_module(void) {
/* disable port irqs */
outb_p(inb_p(LPTC)&~(0x10),LPTC);
/* give them all back */
for ( i = 0; irq_tries[i] ; i++ ) {
free_irq(irq_tries[i],NULL);
}
}
/* makefile
CFLAGS= -D__KERNEL__ -DMODULE
pport.o : pport.c
gcc -O2 $(CFLAGS) -c pport.c
*/
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