248 lines
6.0 KiB
C
248 lines
6.0 KiB
C
/*
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* $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $
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*
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* Copyright (c) 1999-2001 Vojtech Pavlik
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*/
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/*
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* Magellan and Space Mouse 6dof controller driver for Linux
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Should you need to contact me, the author, you can do so either by
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* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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#define MAGELLAN_MAX_LENGTH 32
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static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
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static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
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static char *magellan_name = "LogiCad3D Magellan / SpaceMouse";
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/*
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* Per-Magellan data.
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*/
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struct magellan {
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struct input_dev dev;
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int idx;
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unsigned char data[MAGELLAN_MAX_LENGTH];
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char phys[32];
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};
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/*
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* magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
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* have correct upper nibbles for the lower ones, if not, the packet will
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* be thrown away. It also strips these upper halves to simplify further
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* processing.
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*/
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static int magellan_crunch_nibbles(unsigned char *data, int count)
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{
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static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
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do {
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if (data[count] == nibbles[data[count] & 0xf])
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data[count] = data[count] & 0xf;
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else
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return -1;
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} while (--count);
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return 0;
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}
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static void magellan_process_packet(struct magellan* magellan, struct pt_regs *regs)
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{
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struct input_dev *dev = &magellan->dev;
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unsigned char *data = magellan->data;
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int i, t;
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if (!magellan->idx) return;
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input_regs(dev, regs);
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switch (magellan->data[0]) {
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case 'd': /* Axis data */
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if (magellan->idx != 25) return;
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if (magellan_crunch_nibbles(data, 24)) return;
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for (i = 0; i < 6; i++)
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input_report_abs(dev, magellan_axes[i],
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(data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
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data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768);
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break;
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case 'k': /* Button data */
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if (magellan->idx != 4) return;
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if (magellan_crunch_nibbles(data, 3)) return;
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t = (data[1] << 1) | (data[2] << 5) | data[3];
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for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
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break;
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}
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input_sync(dev);
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}
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static irqreturn_t magellan_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags, struct pt_regs *regs)
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{
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struct magellan* magellan = serio_get_drvdata(serio);
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if (data == '\r') {
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magellan_process_packet(magellan, regs);
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magellan->idx = 0;
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} else {
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if (magellan->idx < MAGELLAN_MAX_LENGTH)
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magellan->data[magellan->idx++] = data;
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}
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return IRQ_HANDLED;
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}
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/*
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* magellan_disconnect() is the opposite of magellan_connect()
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*/
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static void magellan_disconnect(struct serio *serio)
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{
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struct magellan* magellan = serio_get_drvdata(serio);
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input_unregister_device(&magellan->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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kfree(magellan);
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}
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/*
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* magellan_connect() is the routine that is called when someone adds a
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* new serio device that supports Magellan protocol and registers it as
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* an input device.
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*/
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static int magellan_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct magellan *magellan;
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int i, t;
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int err;
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if (!(magellan = kmalloc(sizeof(struct magellan), GFP_KERNEL)))
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return -ENOMEM;
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memset(magellan, 0, sizeof(struct magellan));
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magellan->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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for (i = 0; i < 9; i++)
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set_bit(magellan_buttons[i], magellan->dev.keybit);
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for (i = 0; i < 6; i++) {
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t = magellan_axes[i];
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set_bit(t, magellan->dev.absbit);
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magellan->dev.absmin[t] = -360;
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magellan->dev.absmax[t] = 360;
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}
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sprintf(magellan->phys, "%s/input0", serio->phys);
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init_input_dev(&magellan->dev);
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magellan->dev.private = magellan;
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magellan->dev.name = magellan_name;
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magellan->dev.phys = magellan->phys;
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magellan->dev.id.bustype = BUS_RS232;
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magellan->dev.id.vendor = SERIO_MAGELLAN;
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magellan->dev.id.product = 0x0001;
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magellan->dev.id.version = 0x0100;
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magellan->dev.dev = &serio->dev;
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serio_set_drvdata(serio, magellan);
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err = serio_open(serio, drv);
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if (err) {
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serio_set_drvdata(serio, NULL);
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kfree(magellan);
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return err;
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}
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input_register_device(&magellan->dev);
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printk(KERN_INFO "input: %s on %s\n", magellan_name, serio->phys);
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return 0;
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}
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/*
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* The serio driver structure.
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*/
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static struct serio_device_id magellan_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_MAGELLAN,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
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static struct serio_driver magellan_drv = {
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.driver = {
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.name = "magellan",
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},
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.description = DRIVER_DESC,
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.id_table = magellan_serio_ids,
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.interrupt = magellan_interrupt,
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.connect = magellan_connect,
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.disconnect = magellan_disconnect,
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};
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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init magellan_init(void)
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{
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serio_register_driver(&magellan_drv);
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return 0;
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}
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static void __exit magellan_exit(void)
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{
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serio_unregister_driver(&magellan_drv);
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}
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module_init(magellan_init);
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module_exit(magellan_exit);
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