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/*
* $Id: cobra.c,v 1.10 2000/06/08 10:23:45 vojtech Exp $
*
* Copyright (c) 1999-2000 Vojtech Pavlik
*
* Sponsored by SuSE
*/
/*
* Creative Labd Blaster GamePad Cobra driver for Linux
*/
/*
* 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 <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/gameport.h>
#include <linux/input.h>
#define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */
#define COBRA_REFRESH_TIME HZ/50 /* 20 ms between reads */
#define COBRA_LENGTH 36
static char* cobra_name = "Creative Labs Blaster GamePad Cobra";
static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };
struct cobra {
struct gameport *gameport;
struct timer_list timer;
struct input_dev dev[2];
int used;
int reads;
int bads;
unsigned char exists;
};
static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
{
unsigned long flags;
unsigned char u, v, w;
__u64 buf[2];
int r[2], t[2];
int i, j, ret;
int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
for (i = 0; i < 2; i++) {
r[i] = buf[i] = 0;
t[i] = COBRA_MAX_STROBE;
}
__save_flags(flags);
__cli();
u = gameport_read(gameport);
do {
t[0]--; t[1]--;
v = gameport_read(gameport);
for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
if (w & 0x30) {
if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
t[i] = strobe;
u = v;
} else t[i] = 0;
}
} while (t[0] > 0 || t[1] > 0);
__restore_flags(flags);
ret = 0;
for (i = 0; i < 2; i++) {
if (r[i] != COBRA_LENGTH) continue;
for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
if (j < COBRA_LENGTH) ret |= (1 << i);
data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0)
| ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
| ((buf[i] >> 11) & 0x1f00000);
}
return ret;
}
static void cobra_timer(unsigned long private)
{
struct cobra *cobra = (void *) private;
struct input_dev *dev;
unsigned int data[2];
int i, j, r;
cobra->reads++;
if ((r = cobra_read_packet(cobra->gameport, data)) != cobra->exists)
cobra->bads++;
for (i = 0; i < 2; i++)
if (cobra->exists & r & (1 << i)) {
dev = cobra->dev + i;
input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
for (j = 0; cobra_btn[j]; j++)
input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
}
mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
}
static int cobra_open(struct input_dev *dev)
{
struct cobra *cobra = dev->private;
if (!cobra->used++)
mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
return 0;
}
static void cobra_close(struct input_dev *dev)
{
struct cobra *cobra = dev->private;
if (!--cobra->used)
del_timer(&cobra->timer);
}
static void cobra_connect(struct gameport *gameport, struct gameport_dev *dev)
{
struct cobra *cobra;
unsigned int data[2];
int i, j;
if (!(cobra = kmalloc(sizeof(struct cobra), GFP_KERNEL)))
return;
memset(cobra, 0, sizeof(struct cobra));
gameport->private = cobra;
cobra->gameport = gameport;
init_timer(&cobra->timer);
cobra->timer.data = (long) cobra;
cobra->timer.function = cobra_timer;
if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
goto fail1;
cobra->exists = cobra_read_packet(gameport, data);
for (i = 0; i < 2; i++)
if ((cobra->exists >> i) & data[i] & 1) {
printk(KERN_WARNING "cobra.c: Device on gameport%d.%d has the Ext bit set. ID is: %d"
" Contact vojtech@suse.cz\n", gameport->number, i, (data[i] >> 2) & 7);
cobra->exists &= ~(1 << i);
}
if (!cobra->exists)
goto fail2;
for (i = 0; i < 2; i++)
if ((cobra->exists >> i) & 1) {
cobra->dev[i].private = cobra;
cobra->dev[i].open = cobra_open;
cobra->dev[i].close = cobra_close;
cobra->dev[i].name = cobra_name;
cobra->dev[i].idbus = BUS_GAMEPORT;
cobra->dev[i].idvendor = GAMEPORT_ID_VENDOR_CREATIVE;
cobra->dev[i].idproduct = 0x0008;
cobra->dev[i].idversion = 0x0100;
cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
cobra->dev[i].absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
for (j = 0; cobra_btn[j]; j++)
set_bit(cobra_btn[j], cobra->dev[i].keybit);
cobra->dev[i].absmin[ABS_X] = -1; cobra->dev[i].absmax[ABS_X] = 1;
cobra->dev[i].absmin[ABS_Y] = -1; cobra->dev[i].absmax[ABS_Y] = 1;
input_register_device(cobra->dev + i);
printk(KERN_INFO "input%d: %s on gameport%d.%d\n",
cobra->dev[i].number, cobra_name, gameport->number, i);
}
return;
fail2: gameport_close(gameport);
fail1: kfree(cobra);
}
static void cobra_disconnect(struct gameport *gameport)
{
int i;
struct cobra *cobra = gameport->private;
for (i = 0; i < 2; i++)
if ((cobra->exists >> i) & 1)
input_unregister_device(cobra->dev + i);
gameport_close(gameport);
kfree(cobra);
}
static struct gameport_dev cobra_dev = {
connect: cobra_connect,
disconnect: cobra_disconnect,
};
int __init cobra_init(void)
{
gameport_register_device(&cobra_dev);
return 0;
}
void __exit cobra_exit(void)
{
gameport_unregister_device(&cobra_dev);
}
module_init(cobra_init);
module_exit(cobra_exit);
MODULE_LICENSE("GPL");
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