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/*
* joy-gravis.c Version 1.2
*
* Copyright (c) 1998-1999 Vojtech Pavlik
*
* Sponsored by SuSE
*/
/*
* This is a module for the Linux joystick driver, supporting
* Gravis GrIP digital joystick family.
*/
/*
* 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/errno.h>
#include <linux/ioport.h>
#include <linux/joystick.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/init.h>
#define JS_GR_MODE_GPP 1
#define JS_GR_LENGTH_GPP 24
#define JS_GR_STROBE_GPP 400
#define JS_GR_MODE_XT 2
#define JS_GR_MODE_BD 3
#define JS_GR_LENGTH_XT 4
#define JS_GR_STROBE_XT 200
#define JS_GR_MAX_CHUNKS_XT 10
#define JS_GR_MAX_BITS_XT 30
static int js_gr_port_list[] __initdata = {0x201, 0};
static struct js_port* js_gr_port __initdata = NULL;
struct js_gr_info {
int io;
unsigned char mode[2];
};
/*
* js_gr_gpp_read_packet() reads a Gravis GamePad Pro packet.
*/
static int js_gr_gpp_read_packet(int io, int shift, unsigned int *data)
{
unsigned long flags;
unsigned char u, v;
unsigned int t, p;
int i;
i = 0;
data[0] = 0;
p = t = JS_GR_STROBE_GPP;
p += JS_GR_STROBE_GPP;
__save_flags(flags);
__cli();
v = inb(io) >> shift;
do {
t--;
u = v; v = (inb(io) >> shift) & 3;
if (~v & u & 1) {
data[0] |= (v >> 1) << i++;
p = t = (p - t) << 1;
}
} while (i < JS_GR_LENGTH_GPP && t > 0);
__restore_flags(flags);
if (i < JS_GR_LENGTH_GPP) return -1;
for (i = 0; i < JS_GR_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++)
data[0] = data[0] >> 1 | (data[0] & 1) << (JS_GR_LENGTH_GPP - 1);
return -(i == JS_GR_LENGTH_GPP);
}
/*
* js_gr_xt_read_packet() reads a Gravis Xterminator packet.
*/
static int js_gr_xt_read_packet(int io, int shift, unsigned int *data)
{
unsigned int i, j, buf, crc;
unsigned char u, v, w;
unsigned long flags;
unsigned int t, p;
char status;
data[0] = data[1] = data[2] = data[3] = 0;
status = buf = i = j = 0;
p = t = JS_GR_STROBE_XT;
p += JS_GR_STROBE_XT;
__save_flags(flags);
__cli();
v = w = (inb(io) >> shift) & 3;
do {
t--;
u = (inb(io) >> shift) & 3;
if (u ^ v) {
if ((u ^ v) & 1) {
p = t = (p - t) << 2;
buf = (buf << 1) | (u >> 1);
i++;
} else
if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) {
p = t = (p - t) << 2;
if (i == 20) {
crc = buf ^ (buf >> 7) ^ (buf >> 14);
if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) {
data[buf >> 18] = buf >> 4;
status |= 1 << (buf >> 18);
}
j++;
}
buf = 0;
i = 0;
}
w = v;
v = u;
}
} while (status != 0xf && i < JS_GR_MAX_BITS_XT && j < JS_GR_MAX_CHUNKS_XT && t > 0);
__restore_flags(flags);
return -(status != 0xf);
}
/*
* js_gr_read() reads and analyzes GrIP joystick data.
*/
static int js_gr_read(void *xinfo, int **axes, int **buttons)
{
struct js_gr_info *info = xinfo;
unsigned int data[JS_GR_LENGTH_XT];
int i;
for (i = 0; i < 2; i++)
switch (info->mode[i]) {
case JS_GR_MODE_GPP:
if (js_gr_gpp_read_packet(info->io, (i << 1) + 4, data)) return -1;
axes[i][0] = ((data[0] >> 15) & 1) - ((data[0] >> 16) & 1);
axes[i][1] = ((data[0] >> 13) & 1) - ((data[0] >> 12) & 1);
data[0] = ((data[0] >> 6) & 0x37) | (data[0] & 0x08) | ((data[0] << 1) & 0x40) |
((data[0] << 5) & 0x80) | ((data[0] << 8) & 0x300);
buttons[i][0] = (data[0] & 0xfc) | ((data[0] >> 1) & 0x101) | ((data[0] << 1) & 0x202);
break;
case JS_GR_MODE_XT:
if (js_gr_xt_read_packet(info->io, (i << 1) + 4, data)) return -1;
axes[i][0] = (data[0] >> 2) & 0x3f;
axes[i][1] = 63 - ((data[0] >> 8) & 0x3f);
axes[i][2] = (data[1] >> 2) & 0x3f;
axes[i][3] = (data[1] >> 8) & 0x3f;
axes[i][4] = (data[2] >> 8) & 0x3f;
axes[i][5] = ((data[2] >> 1) & 1) - ( data[2] & 1);
axes[i][6] = ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1);
axes[i][7] = ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1);
axes[i][8] = ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1);
buttons[i][0] = (data[3] >> 3) & 0x7ff;
break;
case JS_GR_MODE_BD:
if (js_gr_xt_read_packet(info->io, (i << 1) + 4, data)) return -1;
axes[i][0] = (data[0] >> 2) & 0x3f;
axes[i][1] = 63 - ((data[0] >> 8) & 0x3f);
axes[i][2] = (data[2] >> 8) & 0x3f;
axes[i][3] = ((data[2] >> 1) & 1) - ( data[2] & 1);
axes[i][4] = ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1);
buttons[i][0] = ((data[3] >> 6) & 0x01) | ((data[3] >> 3) & 0x06)
| ((data[3] >> 4) & 0x18);
break;
default:
break;
}
return 0;
}
/*
* js_gr_init_corr() initializes correction values of
* GrIP joysticks.
*/
static void __init js_gr_init_corr(int mode, struct js_corr *corr)
{
int i;
switch (mode) {
case JS_GR_MODE_GPP:
for (i = 0; i < 2; i++) {
corr[i].type = JS_CORR_BROKEN;
corr[i].prec = 0;
corr[i].coef[0] = 0;
corr[i].coef[1] = 0;
corr[i].coef[2] = (1 << 29);
corr[i].coef[3] = (1 << 29);
}
break;
case JS_GR_MODE_XT:
for (i = 0; i < 5; i++) {
corr[i].type = JS_CORR_BROKEN;
corr[i].prec = 0;
corr[i].coef[0] = 31 - 4;
corr[i].coef[1] = 32 + 4;
corr[i].coef[2] = (1 << 29) / (32 - 14);
corr[i].coef[3] = (1 << 29) / (32 - 14);
}
for (i = 5; i < 9; i++) {
corr[i].type = JS_CORR_BROKEN;
corr[i].prec = 0;
corr[i].coef[0] = 0;
corr[i].coef[1] = 0;
corr[i].coef[2] = (1 << 29);
corr[i].coef[3] = (1 << 29);
}
break;
case JS_GR_MODE_BD:
for (i = 0; i < 3; i++) {
corr[i].type = JS_CORR_BROKEN;
corr[i].prec = 0;
corr[i].coef[0] = 31 - 4;
corr[i].coef[1] = 32 + 4;
corr[i].coef[2] = (1 << 29) / (32 - 14);
corr[i].coef[3] = (1 << 29) / (32 - 14);
}
for (i = 3; i < 5; i++) {
corr[i].type = JS_CORR_BROKEN;
corr[i].prec = 0;
corr[i].coef[0] = 0;
corr[i].coef[1] = 0;
corr[i].coef[2] = (1 << 29);
corr[i].coef[3] = (1 << 29);
}
break;
}
}
/*
* js_gr_probe() probes for GrIP joysticks.
*/
static struct js_port __init *js_gr_probe(int io, struct js_port *port)
{
struct js_gr_info info;
char *names[] = { NULL, "Gravis GamePad Pro", "Gravis Xterminator", "Gravis Blackhawk Digital"};
char axes[] = { 0, 2, 9, 5};
char buttons[] = { 0, 10, 11, 5};
unsigned int data[JS_GR_LENGTH_XT];
int i;
if (check_region(io, 1)) return port;
info.mode[0] = info.mode[1] = 0;
for (i = 0; i < 2; i++) {
if (!js_gr_gpp_read_packet(io, (i << 1) + 4, data)) info.mode[i] = JS_GR_MODE_GPP;
if (!js_gr_xt_read_packet(io, (i << 1) + 4, data)) {
if ((data[3] & 7) == 7)
info.mode[i] = JS_GR_MODE_XT;
if ((data[3] & 7) == 0)
info.mode[i] = JS_GR_MODE_BD;
}
}
if (!info.mode[0] && !info.mode[1]) return port;
info.io = io;
request_region(io, 1, "joystick (gravis)");
port = js_register_port(port, &info, 2, sizeof(struct js_gr_info), js_gr_read);
for (i = 0; i < 2; i++)
if (info.mode[i]) {
printk(KERN_INFO "js%d: %s at %#x\n",
js_register_device(port, i, axes[info.mode[i]], buttons[info.mode[i]],
names[info.mode[i]], THIS_MODULE, NULL, NULL),
names[info.mode[i]], io);
js_gr_init_corr(info.mode[i], port->corr[i]);
}
return port;
}
#ifdef MODULE
int init_module(void)
#else
int __init js_gr_init(void)
#endif
{
int *p;
for (p = js_gr_port_list; *p; p++) js_gr_port = js_gr_probe(*p, js_gr_port);
if (js_gr_port) return 0;
#ifdef MODULE
printk(KERN_WARNING "joy-gravis: no joysticks found\n");
#endif
return -ENODEV;
}
#ifdef MODULE
void cleanup_module(void)
{
int i;
struct js_gr_info *info;
while (js_gr_port) {
for (i = 0; i < js_gr_port->ndevs; i++)
if (js_gr_port->devs[i])
js_unregister_device(js_gr_port->devs[i]);
info = js_gr_port->info;
release_region(info->io, 1);
js_gr_port = js_unregister_port(js_gr_port);
}
}
#endif
|
