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/*
* joydump.c Version 1.2
*
* Copyright (c) 1996-1999 Vojtech Pavlik
*
* Sponsored by SuSE
*/
/*
* This is just a very simple driver that can dump the data
* out of the joystick port into the syslog ...
*/
/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
*/
#include <asm/io.h>
#include <asm/system.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/joystick.h>
#include <linux/kernel.h>
#include <linux/delay.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
#define JS_PORT 0x201
#ifdef __i386__
#ifdef CONFIG_X86_TSC
#define GET_TIME(x) __asm__ __volatile__ ( "rdtsc" : "=a" (x) : : "dx" )
#endif
#elif __alpha__
#define GET_TIME(x) __asm__ __volatile__ ( "rpcc %0" : "=r" (x) )
#endif
#ifndef GET_TIME
#warning "Using unreliable time source."
#define FAKE_TIME
static unsigned long dumptime = 0;
#define GET_TIME(x) do { x = dumptime++; } while(0)
#endif
#define BUF_SIZE 256
struct datatype {
unsigned int time;
unsigned char data;
};
static struct datatype buf[BUF_SIZE];
int init_module(void)
{
int i, j;
unsigned int t, t1;
int timeout, div;
unsigned long flags;
unsigned char u;
printk(KERN_INFO "joydump: ,------------------- START ------------------.\n");
/*
* Calibrate.
*/
__save_flags(flags);
__cli();
GET_TIME(t);
udelay(1000);
#ifdef FAKE_TIME
dumptime += 1000;
#endif
GET_TIME(t1);
__restore_flags(flags);
timeout = t1 - t;
div = timeout / 1000;
if (div < 1) {
printk(KERN_INFO "joydump: | CLOCK NOT TICKING! |\n");
printk(KERN_INFO "joydump: `-------------------- END -------------------'\n");
}
printk(KERN_INFO "joydump: | Timer ticks at %3d.%02d MHz. |\n",
timeout / 1000, timeout / 10 % 100);
__save_flags(flags);
__cli();
GET_TIME(t);
inb(JS_PORT); inb(JS_PORT); inb(JS_PORT); inb(JS_PORT); inb(JS_PORT);
inb(JS_PORT); inb(JS_PORT); inb(JS_PORT); inb(JS_PORT); inb(JS_PORT);
GET_TIME(t1);
__restore_flags(flags);
printk(KERN_INFO "joydump: | I/O at %#x takes %d.%02d us. |\n",
JS_PORT, (t1 - t) / div / 10, (t1 - t) * 10 / div % 100);
timeout *= 40;
/*
* Gather data.
*/
__save_flags(flags);
__cli();
u = inb(JS_PORT);
GET_TIME(t1);
t = t1;
buf[0].data = u;
buf[0].time = t1;
i = 1;
outb(0xff,JS_PORT);
while (i < BUF_SIZE && t1 - t < timeout) {
GET_TIME(t1);
buf[i].data = inb(JS_PORT);
if (buf[i].data != u) {
u = buf[i].data;
buf[i].time = t1;
i++;
}
}
__restore_flags(flags);
/*
* Dump data.
*/
t = i;
printk(KERN_INFO "joydump: >------------------- DATA -------------------<\n");
printk(KERN_INFO "joydump: | index: %3d delta: %3d.%02d us data: ", 0, 0, 0);
for (j = 7; j >= 0; j--)
printk("%d",(buf[0].data >> j) & 1);
printk(" |\n");
for (i = 1; i < t; i++) {
printk(KERN_INFO "joydump: | index: %3d delta: %3d.%02d us data: ", i,
(buf[i].time - buf[i-1].time) / div, (buf[i].time - buf[i-1].time) * 100 / div % 100);
for (j = 7; j >= 0; j--)
printk("%d",(buf[i].data >> j) & 1);
printk(" |\n");
}
printk(KERN_INFO "joydump: `-------------------- END -------------------'\n");
return -1;
}
void cleanup_module(void)
{
}
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