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* joy-logitech.c Version 1.2
*
* Copyright (c) 1998 Vojtech Pavlik
*/
/*
* This is a module for the Linux joystick driver, supporting
* Logitech 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@ucw.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/delay.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>
#define JS_LT_MAX_START 250
#define JS_LT_MAX_STROBE 25
#define JS_LT_MAX_LENGTH 72
#define JS_LT_MAX_DELAY 12000
#define JS_LT_MODE_WMED 1
#define JS_LT_MODE_CM2 2
#define JS_LT_MODE_TPD 3
static int js_lt_seq_init[] __initdata = { 6000, 11000, 7000, 9000, 6000, 11000, 7000, 9000, 0 };
static int js_lt_seq_reset[] __initdata = { 2000, 3000, 2000, 3000, 0 };
static int js_lt_port_list[] __initdata = {0x201, 0};
static struct js_port* js_lt_port __initdata = NULL;
static struct {
int x;
int y;
} js_lt_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
struct js_lt_info {
int io;
unsigned char mode;
};
/*
* js_lt_read_packet() reads a Logitech packet.
*/
static int js_lt_read_packet(int io, __u64 *data)
{
static unsigned char buf[JS_LT_MAX_LENGTH];
unsigned char u, v, w, mask = 0;
int i;
unsigned long flags;
unsigned int t, t1;
int start = (js_time_speed * JS_LT_MAX_START) >> 10;
int strobe = (js_time_speed * JS_LT_MAX_STROBE) >> 10;
u = inb(io) >> 4;
if (u == 0xc) mask = 0x10;
if (u == 0x0) mask = 0x50;
if (!mask) return 0;
i = 0;
__save_flags(flags);
__cli();
outb(0xff,io);
u = inb(io);
t = js_get_time();
if ((u & 0xc) != 0xc) mask = 0x10;
do {
u = inb(io);
t1 = js_get_time();
} while ((((u >> 1) ^ u) & mask) != mask && js_delta(t1,t) < start);
t = t1;
do {
v = inb(io);
t1 = js_get_time();
w = u ^ v;
if ((((w >> 1) ^ w) & mask) == mask) {
buf[i++] = w;
t = t1;
u = v;
}
} while (i < JS_LT_MAX_LENGTH && js_delta(t1,t) < strobe);
__restore_flags(flags);
t = i;
*data = 0;
if (mask == 0x10) {
for (i = 0; i < t; i++)
*data = ((buf[i] >> 5) & 1) | (*data << 1);
return t;
}
if (mask == 0x50) {
for (i = 0; i < t; i++)
*data = ((__u64)(buf[i] & 0x20) << (t - 5)) | (buf[i] >> 7) | (*data << 1);
return t << 1;
}
return 0;
}
/*
* js_lt_reverse() reverses the order of bits in a byte.
*/
static unsigned char js_lt_reverse(unsigned char u)
{
u = ((u & 0x0f) << 4) | ((u >> 4) & 0x0f);
u = ((u & 0x33) << 2) | ((u >> 2) & 0x33);
u = ((u & 0x55) << 1) | ((u >> 1) & 0x55);
return u;
}
/*
* js_lt_read() reads and analyzes Logitech joystick data.
*/
static int js_lt_read(void *xinfo, int **axes, int **buttons)
{
struct js_lt_info *info = xinfo;
__u64 data;
int hat;
switch (info->mode) {
case JS_LT_MODE_TPD:
if (js_lt_read_packet(info->io, &data) != 20) return -1;
axes[0][0] = ((data >> 6) & 1) - ((data >> 4) & 1);
axes[0][1] = ((data >> 5) & 1) - ((data >> 7) & 1);
buttons[0][0] = js_lt_reverse((data & 0x0f) | ((data >> 4) & 0xf0));
return 0;
case JS_LT_MODE_WMED:
if (js_lt_read_packet(info->io, &data) != 42) return -1;
if ((hat = data & 0xf) > 8) return -1;
axes[0][0] = (data >> 26) & 0xff;
axes[0][1] = (data >> 18) & 0xff;
axes[0][2] = (data >> 10) & 0xff;
axes[0][3] = js_lt_hat_to_axis[hat].x;
axes[0][4] = js_lt_hat_to_axis[hat].y;
buttons[0][0] = js_lt_reverse((data >> 2) & 0xfc);
return 0;
case JS_LT_MODE_CM2:
if (js_lt_read_packet(info->io, &data) != 64) return -1;
axes[0][0] = (data >> 48) & 0xff;
axes[0][1] = (data >> 40) & 0xff;
axes[0][2] = (data >> 32) & 0xff;
axes[0][3] = (data >> 24) & 0xff;
axes[0][4] = (data >> 16) & 0xff;
axes[0][5] = (data >> 8) & 0xff;
buttons[0][0] = js_lt_reverse(data & 0xff);
return 0;
}
return -1;
}
/*
* js_lt_open() is a callback from the file open routine.
*/
static int js_lt_open(struct js_dev *jd)
{
MOD_INC_USE_COUNT;
return 0;
}
/*
* js_lt_close() is a callback from the file release routine.
*/
static int js_lt_close(struct js_dev *jd)
{
MOD_DEC_USE_COUNT;
return 0;
}
/*
* js_lt_trigger_sequence() sends a trigger & delay sequence
* to reset/initialize a Logitech joystick.
*/
static void __init js_lt_trigger_sequence(int io, int *seq)
{
while (*seq) {
outb(0xff,io);
udelay(*seq++);
}
}
/*
* js_lt_init_corr() initializes the correction values for
* Logitech joysticks.
*/
static void __init js_lt_init_corr(int num_axes, int mode, int **axes, struct js_corr **corr)
{
int j;
for (j = 0; j < num_axes; j++) {
corr[0][j].type = JS_CORR_BROKEN;
corr[0][j].prec = 2;
corr[0][j].coef[0] = axes[0][j] - 8;
corr[0][j].coef[1] = axes[0][j] + 8;
corr[0][j].coef[2] = (1 << 29) / (127 - 32);
corr[0][j].coef[3] = (1 << 29) / (127 - 32);
}
switch (mode) {
case JS_LT_MODE_TPD: j = 0; break;
case JS_LT_MODE_WMED: j = 3; break;
case JS_LT_MODE_CM2: j = 6; break;
default: j = 0; break;
}
for (; j < num_axes; j++) {
corr[0][j].type = JS_CORR_BROKEN;
corr[0][j].prec = 0;
corr[0][j].coef[0] = 0;
corr[0][j].coef[1] = 0;
corr[0][j].coef[2] = (1 << 29);
corr[0][j].coef[3] = (1 << 29);
}
}
/*
* js_lt_probe() probes for Logitech type joysticks.
*/
static struct js_port __init *js_lt_probe(int io, struct js_port *port)
{
struct js_lt_info info;
char *name;
int axes, buttons, i;
__u64 data;
unsigned char u;
if (check_region(io, 1)) return port;
if (((u = inb(io)) & 3) == 3) return port;
outb(0xff,io);
if (!((inb(io) ^ u) & ~u & 0xf)) return port;
if (!(i = js_lt_read_packet(io, &data))) {
udelay(JS_LT_MAX_DELAY);
js_lt_trigger_sequence(io, js_lt_seq_reset);
js_lt_trigger_sequence(io, js_lt_seq_init);
i = js_lt_read_packet(io, &data);
}
switch (i) {
case 0:
return port;
case 20:
info.mode = JS_LT_MODE_TPD;
axes = 2; buttons = 8; name = "Logitech ThunderPad Digital";
break;
case 42:
info.mode = JS_LT_MODE_WMED;
axes = 5; buttons = 6; name = "Logitech WingMan Extreme Digital";
break;
case 64:
info.mode = JS_LT_MODE_CM2;
axes = 6; buttons = 8; name = "Logitech CyberMan 2";
break;
case 72:
case 144:
return port;
default:
printk(KERN_WARNING "joy-logitech: unknown joystick device detected "
"(io=%#x, count=%d, data=0x%08x%08x), contact <vojtech@ucw.cz>\n",
io, i, (int)(data >> 32), (int)(data & 0xffffffff));
return port;
}
info.io = io;
request_region(io, 1, "joystick (logitech)");
port = js_register_port(port, &info, 1, sizeof(struct js_lt_info), js_lt_read);
printk(KERN_INFO "js%d: %s at %#x\n",
js_register_device(port, 0, axes, buttons, name, js_lt_open, js_lt_close), name, io);
udelay(JS_LT_MAX_DELAY);
js_lt_read(port->info, port->axes, port->buttons);
js_lt_init_corr(axes, info.mode, port->axes, port->corr);
return port;
}
#ifdef MODULE
int init_module(void)
#else
int __init js_lt_init(void)
#endif
{
int *p;
for (p = js_lt_port_list; *p; p++) js_lt_port = js_lt_probe(*p, js_lt_port);
if (js_lt_port) return 0;
#ifdef MODULE
printk(KERN_WARNING "joy-logitech: no joysticks found\n");
#endif
return -ENODEV;
}
#ifdef MODULE
void cleanup_module(void)
{
struct js_lt_info *info;
while (js_lt_port != NULL) {
js_unregister_device(js_lt_port->devs[0]);
info = js_lt_port->info;
release_region(info->io, 1);
js_lt_port = js_unregister_port(js_lt_port);
}
}
#endif
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