/*
* $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $
*
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
/*
* Magellan and Space Mouse 6dof controller 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@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
#define MAGELLAN_MAX_LENGTH 32
static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
/*
* Per-Magellan data.
*/
struct magellan {
struct input_dev *dev;
int idx;
unsigned char data[MAGELLAN_MAX_LENGTH];
char phys[32];
};
/*
* magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
* have correct upper nibbles for the lower ones, if not, the packet will
* be thrown away. It also strips these upper halves to simplify further
* processing.
*/
static int magellan_crunch_nibbles(unsigned char *data, int count)
{
static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
do {
if (data[count] == nibbles[data[count] & 0xf])
data[count] = data[count] & 0xf;
else
return -1;
} while (--count);
return 0;
}
static void magellan_process_packet(struct magellan* magellan, struct pt_regs *regs)
{
struct input_dev *dev = magellan->dev;
unsigned char *data = magellan->data;
int i, t;
if (!magellan->idx) return;
input_regs(dev, regs);
switch (magellan->data[0]) {
case 'd': /* Axis data */
if (magellan->idx != 25) return;
if (magellan_crunch_nibbles(data, 24)) return;
for (i = 0; i < 6; i++)
input_report_abs(dev, magellan_axes[i],
(data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768);
break;
case 'k': /* Button data */
if (magellan->idx != 4) return;
if (magellan_crunch_nibbles(data, 3)) return;
t = (data[1] << 1) | (data[2] << 5) | data[3];
for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
break;
}
input_sync(dev);
}
static irqreturn_t magellan_interrupt(struct serio *serio,
unsigned char data, unsigned int flags, struct pt_regs *regs)
{
struct magellan* magellan = serio_get_drvdata(serio);
if (data == '\r') {
magellan_process_packet(magellan, regs);
magellan->idx = 0;
} else {
if (magellan->idx < MAGELLAN_MAX_LENGTH)
magellan->data[magellan->idx++] = data;
}
return IRQ_HANDLED;
}
/*
* magellan_disconnect() is the opposite of magellan_connect()
*/
static void magellan_disconnect(struct serio *serio)
{
struct magellan* magellan = serio_get_drvdata(serio);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_unregister_device(magellan->dev);
kfree(magellan);
}
/*
* magellan_connect() is the routine that is called when someone adds a
* new serio device that supports Magellan protocol and registers it as
* an input device.
*/
static int magellan_connect(struct serio *serio, struct serio_driver *drv)
{
struct magellan *magellan;
struct input_dev *input_dev;
int err = -ENOMEM;
int i;
magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
input_dev = input_allocate_device();
if (!magellan || !input_dev)
goto fail;
magellan->dev = input_dev;
sprintf(magellan->phys, "%s/input0", serio->phys);
input_dev->name = "LogiCad3D Magellan / SpaceMouse";
input_dev->phys = magellan->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_MAGELLAN;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->cdev.dev = &serio->dev;
input_dev->private = magellan;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
for (i = 0; i < 9; i++)
set_bit(magellan_buttons[i], input_dev->keybit);
for (i = 0; i < 6; i++)
input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
serio_set_drvdata(serio, magellan);
err = serio_open(serio, drv);
if (err)
goto fail;
input_register_device(magellan->dev);
return 0;
fail: serio_set_drvdata(serio, NULL);
input_free_device(input_dev);
kfree(magellan);
return err;
}
/*
* The serio driver structure.
*/
static struct serio_device_id magellan_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_MAGELLAN,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
static struct serio_driver magellan_drv = {
.driver = {
.name = "magellan",
},
.description = DRIVER_DESC,
.id_table = magellan_serio_ids,
.interrupt = magellan_interrupt,
.connect = magellan_connect,
.disconnect = magellan_disconnect,
};
/*
* The functions for inserting/removing us as a module.
*/
static int __init magellan_init(void)
{
serio_register_driver(&magellan_drv);
return 0;
}
static void __exit magellan_exit(void)
{
serio_unregister_driver(&magellan_drv);
}
module_init(magellan_init);
module_exit(magellan_exit);
