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/*
* $Id: spaceball.c,v 1.7 2000/06/24 11:55:40 vojtech Exp $
*
* Copyright (c) 1999-2000 Vojtech Pavlik
*
* Based on the work of:
* David Thompson
* Joseph Krahn
*
* Sponsored by SuSE
*/
/*
* SpaceTec SpaceBall 4000 FLX 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/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/serio.h>
/*
* Constants.
*/
#define JS_SBALL_MAX_LENGTH 128
static int spaceball_axes[] = { ABS_X, ABS_Z, ABS_Y, ABS_RX, ABS_RZ, ABS_RY };
static char *spaceball_name = "SpaceTec SpaceBall 4000 FLX";
/*
* Per-Ball data.
*/
struct spaceball {
struct input_dev dev;
struct serio *serio;
int idx;
int escape;
unsigned char data[JS_SBALL_MAX_LENGTH];
};
/*
* spaceball_process_packet() decodes packets the driver receives from the
* SpaceBall.
*/
static void spaceball_process_packet(struct spaceball* spaceball)
{
struct input_dev *dev = &spaceball->dev;
unsigned char *data = spaceball->data;
int i;
if (spaceball->idx < 2) return;
printk("%c %d\n", spaceball->data[0], spaceball->idx);
switch (spaceball->data[0]) {
case '@': /* Reset packet */
spaceball->data[spaceball->idx - 1] = 0;
for (i = 1; i < spaceball->idx && spaceball->data[i] == ' '; i++);
printk(KERN_INFO "input%d: %s [%s] on serio%d\n",
spaceball->dev.number, spaceball_name, spaceball->data + i, spaceball->serio->number);
break;
case 'D': /* Ball data */
if (spaceball->idx != 15) return;
for (i = 0; i < 6; i++) {
input_report_abs(dev, spaceball_axes[i],
(__s16)((data[2 * i + 3] << 8) | data[2 * i + 2]));
}
break;
case '.': /* Button data, part2 */
if (spaceball->idx != 3) return;
input_report_key(dev, BTN_0, data[2] & 1);
input_report_key(dev, BTN_1, data[2] & 2);
break;
case '?': /* Error packet */
spaceball->data[spaceball->idx - 1] = 0;
printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1);
break;
}
}
/*
* Spaceball 4000 FLX packets all start with a one letter packet-type decriptor,
* and end in 0x0d. It uses '^' as an escape for 0x0d characters which can
* occur in the axis values. ^M, ^Q and ^S all mean 0x0d, depending (I think)
* on whether the axis value is increasing, decreasing, or same as before.
* (I don't see why this is useful).
*/
static void spaceball_interrupt(struct serio *serio, unsigned char data, unsigned int flags)
{
struct spaceball *spaceball = serio->private;
switch (data) {
case 0xd:
spaceball_process_packet(spaceball);
spaceball->idx = 0;
spaceball->escape = 0;
return;
case '^':
if (!spaceball->escape) {
spaceball->escape ^= 1;
return;
}
spaceball->escape = 0;
case 'M':
case 'Q':
case 'S':
if (spaceball->escape) {
spaceball->escape = 0;
data = 0xd;
}
default:
if (spaceball->escape) {
spaceball->escape = 0;
printk(KERN_WARNING "spaceball.c: Unknown escaped character: %#x (%c)\n", data, data);
}
if (spaceball->idx < JS_SBALL_MAX_LENGTH)
spaceball->data[spaceball->idx++] = data;
return;
}
}
/*
* spaceball_disconnect() is the opposite of spaceball_connect()
*/
static void spaceball_disconnect(struct serio *serio)
{
struct spaceball* spaceball = serio->private;
input_unregister_device(&spaceball->dev);
serio_close(serio);
kfree(spaceball);
}
/*
* spaceball_connect() is the routine that is called when someone adds a
* new serio device. It looks for the Magellan, and if found, registers
* it as an input device.
*/
static void spaceball_connect(struct serio *serio, struct serio_dev *dev)
{
struct spaceball *spaceball;
int i, t;
if (serio->type != (SERIO_RS232 | SERIO_SPACEBALL))
return;
if (!(spaceball = kmalloc(sizeof(struct spaceball), GFP_KERNEL)))
return;
memset(spaceball, 0, sizeof(struct spaceball));
spaceball->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
spaceball->dev.keybit[LONG(BTN_0)] = BIT(BTN_0) | BIT(BTN_1);
for (i = 0; i < 6; i++) {
t = spaceball_axes[i];
set_bit(t, spaceball->dev.absbit);
spaceball->dev.absmin[t] = i < 3 ? -8000 : -1600;
spaceball->dev.absmax[t] = i < 3 ? 8000 : 1600;
spaceball->dev.absflat[t] = i < 3 ? 40 : 8;
spaceball->dev.absfuzz[t] = i < 3 ? 8 : 2;
}
spaceball->serio = serio;
spaceball->dev.private = spaceball;
spaceball->dev.name = spaceball_name;
spaceball->dev.idbus = BUS_RS232;
spaceball->dev.idvendor = SERIO_SPACEBALL;
spaceball->dev.idproduct = 0x0001;
spaceball->dev.idversion = 0x0100;
serio->private = spaceball;
if (serio_open(serio, dev)) {
kfree(spaceball);
return;
}
input_register_device(&spaceball->dev);
}
/*
* The serio device structure.
*/
static struct serio_dev spaceball_dev = {
interrupt: spaceball_interrupt,
connect: spaceball_connect,
disconnect: spaceball_disconnect,
};
/*
* The functions for inserting/removing us as a module.
*/
int __init spaceball_init(void)
{
serio_register_device(&spaceball_dev);
return 0;
}
void __exit spaceball_exit(void)
{
serio_unregister_device(&spaceball_dev);
}
module_init(spaceball_init);
module_exit(spaceball_exit);
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