magellan.c
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上传日期:2013-04-10
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- /*
- * $Id: magellan.c,v 1.8 2000/05/31 13:17:12 vojtech Exp $
- *
- * Copyright (c) 1999-2000 Vojtech Pavlik
- *
- * Sponsored by SuSE
- */
- /*
- * 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, Ucitelska 1576, 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>
- /*
- * 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};
- static char *magellan_name = "LogiCad3D Magellan";
- /*
- * Per-Magellan data.
- */
- struct magellan {
- struct input_dev dev;
- int idx;
- unsigned char data[MAGELLAN_MAX_LENGTH];
- };
- /*
- * 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 input_dev *dev = &magellan->dev;
- unsigned char *data = magellan->data;
- int i, t;
- if (!magellan->idx) return;
- 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;
- }
- }
- static void magellan_interrupt(struct serio *serio, unsigned char data, unsigned int flags)
- {
- struct magellan* magellan = serio->private;
- if (data == 'r') {
- magellan_process_packet(magellan);
- magellan->idx = 0;
- } else {
- if (magellan->idx < MAGELLAN_MAX_LENGTH)
- magellan->data[magellan->idx++] = data;
- }
- }
- /*
- * magellan_disconnect() is the opposite of magellan_connect()
- */
- static void magellan_disconnect(struct serio *serio)
- {
- struct magellan* magellan = serio->private;
- input_unregister_device(&magellan->dev);
- serio_close(serio);
- kfree(magellan);
- }
- /*
- * magellan_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 magellan_connect(struct serio *serio, struct serio_dev *dev)
- {
- struct magellan *magellan;
- int i, t;
- if (serio->type != (SERIO_RS232 | SERIO_MAGELLAN))
- return;
- if (!(magellan = kmalloc(sizeof(struct magellan), GFP_KERNEL)))
- return;
- memset(magellan, 0, sizeof(struct magellan));
- magellan->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
- for (i = 0; i < 9; i++)
- set_bit(magellan_buttons[i], &magellan->dev.keybit);
- for (i = 0; i < 6; i++) {
- t = magellan_axes[i];
- set_bit(t, magellan->dev.absbit);
- magellan->dev.absmin[t] = -360;
- magellan->dev.absmax[t] = 360;
- }
- magellan->dev.private = magellan;
- magellan->dev.name = magellan_name;
- magellan->dev.idbus = BUS_RS232;
- magellan->dev.idvendor = SERIO_MAGELLAN;
- magellan->dev.idproduct = 0x0001;
- magellan->dev.idversion = 0x0100;
-
- serio->private = magellan;
- if (serio_open(serio, dev)) {
- kfree(magellan);
- return;
- }
- input_register_device(&magellan->dev);
- printk(KERN_INFO "input%d: %s on serio%dn", magellan->dev.number, magellan_name, serio->number);
- }
- /*
- * The serio device structure.
- */
- static struct serio_dev magellan_dev = {
- interrupt: magellan_interrupt,
- connect: magellan_connect,
- disconnect: magellan_disconnect,
- };
- /*
- * The functions for inserting/removing us as a module.
- */
- int __init magellan_init(void)
- {
- serio_register_device(&magellan_dev);
- return 0;
- }
- void __exit magellan_exit(void)
- {
- serio_unregister_device(&magellan_dev);
- }
- module_init(magellan_init);
- module_exit(magellan_exit);
- MODULE_LICENSE("GPL");