2 * $Id: twidjoy.c,v 1.5 2002/01/22 20:31:53 vojtech Exp $
4 * derived from CVS-ID "stinger.c,v 1.5 2001/05/29 12:57:18 vojtech Exp"
6 * Copyright (c) 2001 Arndt Schoenewald
7 * Copyright (c) 2000-2001 Vojtech Pavlik
8 * Copyright (c) 2000 Mark Fletcher
10 * Sponsored by Quelltext AG (http://www.quelltext-ag.de), Dortmund, Germany
14 * Driver to use Handykey's Twiddler (the first edition, i.e. the one with
15 * the RS232 interface) as a joystick under Linux
17 * The Twiddler is a one-handed chording keyboard featuring twelve buttons on
18 * the front, six buttons on the top, and a built-in tilt sensor. The buttons
19 * on the front, which are grouped as four rows of three buttons, are pressed
20 * by the four fingers (this implies only one button per row can be held down
21 * at the same time) and the buttons on the top are for the thumb. The tilt
22 * sensor delivers X and Y axis data depending on how the Twiddler is held.
23 * Additional information can be found at http://www.handykey.com.
25 * This driver does not use the Twiddler for its intended purpose, i.e. as
26 * a chording keyboard, but as a joystick: pressing and releasing a button
27 * immediately sends a corresponding button event, and tilting it generates
28 * corresponding ABS_X and ABS_Y events. This turns the Twiddler into a game
29 * controller with amazing 18 buttons :-)
31 * Note: The Twiddler2 (the successor of the Twiddler that connects directly
32 * to the PS/2 keyboard and mouse ports) is NOT supported by this driver!
34 * For questions or feedback regarding this driver module please contact:
35 * Arndt Schoenewald <arndt@quelltext.com>
39 * This program is free software; you can redistribute it and/or modify
40 * it under the terms of the GNU General Public License as published by
41 * the Free Software Foundation; either version 2 of the License, or
42 * (at your option) any later version.
44 * This program is distributed in the hope that it will be useful,
45 * but WITHOUT ANY WARRANTY; without even the implied warranty of
46 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
47 * GNU General Public License for more details.
49 * You should have received a copy of the GNU General Public License
50 * along with this program; if not, write to the Free Software
51 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
54 #include <linux/kernel.h>
55 #include <linux/module.h>
56 #include <linux/slab.h>
57 #include <linux/input.h>
58 #include <linux/serio.h>
59 #include <linux/init.h>
61 #define DRIVER_DESC "Handykey Twiddler keyboard as a joystick driver"
63 MODULE_DESCRIPTION(DRIVER_DESC);
64 MODULE_LICENSE("GPL");
70 #define TWIDJOY_MAX_LENGTH 5
72 static char *twidjoy_name = "Handykey Twiddler";
74 static struct twidjoy_button_spec {
80 { 0, 3, { BTN_A, BTN_B, BTN_C } },
81 { 2, 3, { BTN_X, BTN_Y, BTN_Z } },
82 { 4, 3, { BTN_TL, BTN_TR, BTN_TR2 } },
83 { 6, 3, { BTN_SELECT, BTN_START, BTN_MODE } },
84 { 8, 1, { BTN_BASE5 } },
85 { 9, 1, { BTN_BASE } },
86 { 10, 1, { BTN_BASE3 } },
87 { 11, 1, { BTN_BASE4 } },
88 { 12, 1, { BTN_BASE2 } },
89 { 13, 1, { BTN_BASE6 } },
100 unsigned char data[TWIDJOY_MAX_LENGTH];
105 * twidjoy_process_packet() decodes packets the driver receives from the
106 * Twiddler. It updates the data accordingly.
109 static void twidjoy_process_packet(struct twidjoy *twidjoy, struct pt_regs *regs)
111 if (twidjoy->idx == TWIDJOY_MAX_LENGTH) {
112 struct input_dev *dev = &twidjoy->dev;
113 unsigned char *data = twidjoy->data;
114 struct twidjoy_button_spec *bp;
115 int button_bits, abs_x, abs_y;
117 button_bits = ((data[1] & 0x7f) << 7) | (data[0] & 0x7f);
119 input_regs(dev, regs);
121 for (bp = twidjoy_buttons; bp->bitmask; bp++) {
122 int value = (button_bits & (bp->bitmask << bp->bitshift)) >> bp->bitshift;
125 for (i = 0; i < bp->bitmask; i++)
126 input_report_key(dev, bp->buttons[i], i+1 == value);
129 abs_x = ((data[4] & 0x07) << 5) | ((data[3] & 0x7C) >> 2);
130 if (data[4] & 0x08) abs_x -= 256;
132 abs_y = ((data[3] & 0x01) << 7) | ((data[2] & 0x7F) >> 0);
133 if (data[3] & 0x02) abs_y -= 256;
135 input_report_abs(dev, ABS_X, -abs_x);
136 input_report_abs(dev, ABS_Y, +abs_y);
145 * twidjoy_interrupt() is called by the low level driver when characters
146 * are ready for us. We then buffer them for further processing, or call the
147 * packet processing routine.
150 static irqreturn_t twidjoy_interrupt(struct serio *serio, unsigned char data, unsigned int flags, struct pt_regs *regs)
152 struct twidjoy *twidjoy = serio_get_drvdata(serio);
154 /* All Twiddler packets are 5 bytes. The fact that the first byte
155 * has a MSB of 0 and all other bytes have a MSB of 1 can be used
156 * to check and regain sync. */
158 if ((data & 0x80) == 0)
159 twidjoy->idx = 0; /* this byte starts a new packet */
160 else if (twidjoy->idx == 0)
161 return IRQ_HANDLED; /* wrong MSB -- ignore this byte */
163 if (twidjoy->idx < TWIDJOY_MAX_LENGTH)
164 twidjoy->data[twidjoy->idx++] = data;
166 if (twidjoy->idx == TWIDJOY_MAX_LENGTH) {
167 twidjoy_process_packet(twidjoy, regs);
175 * twidjoy_disconnect() is the opposite of twidjoy_connect()
178 static void twidjoy_disconnect(struct serio *serio)
180 struct twidjoy *twidjoy = serio_get_drvdata(serio);
182 input_unregister_device(&twidjoy->dev);
184 serio_set_drvdata(serio, NULL);
189 * twidjoy_connect() is the routine that is called when someone adds a
190 * new serio device. It looks for the Twiddler, and if found, registers
191 * it as an input device.
194 static int twidjoy_connect(struct serio *serio, struct serio_driver *drv)
196 struct twidjoy_button_spec *bp;
197 struct twidjoy *twidjoy;
201 if (!(twidjoy = kmalloc(sizeof(struct twidjoy), GFP_KERNEL)))
204 memset(twidjoy, 0, sizeof(struct twidjoy));
206 sprintf(twidjoy->phys, "%s/input0", serio->phys);
208 init_input_dev(&twidjoy->dev);
209 twidjoy->dev.name = twidjoy_name;
210 twidjoy->dev.phys = twidjoy->phys;
211 twidjoy->dev.id.bustype = BUS_RS232;
212 twidjoy->dev.id.vendor = SERIO_TWIDJOY;
213 twidjoy->dev.id.product = 0x0001;
214 twidjoy->dev.id.version = 0x0100;
215 twidjoy->dev.dev = &serio->dev;
217 twidjoy->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
219 for (bp = twidjoy_buttons; bp->bitmask; bp++) {
220 for (i = 0; i < bp->bitmask; i++)
221 set_bit(bp->buttons[i], twidjoy->dev.keybit);
224 twidjoy->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
226 for (i = 0; i < 2; i++) {
227 twidjoy->dev.absmax[ABS_X+i] = 50;
228 twidjoy->dev.absmin[ABS_X+i] = -50;
230 /* TODO: arndt 20010708: Are these values appropriate? */
231 twidjoy->dev.absfuzz[ABS_X+i] = 4;
232 twidjoy->dev.absflat[ABS_X+i] = 4;
235 twidjoy->dev.private = twidjoy;
237 serio_set_drvdata(serio, twidjoy);
239 err = serio_open(serio, drv);
241 serio_set_drvdata(serio, NULL);
246 input_register_device(&twidjoy->dev);
248 printk(KERN_INFO "input: %s on %s\n", twidjoy_name, serio->phys);
254 * The serio driver structure.
257 static struct serio_device_id twidjoy_serio_ids[] = {
260 .proto = SERIO_TWIDJOY,
267 MODULE_DEVICE_TABLE(serio, twidjoy_serio_ids);
269 static struct serio_driver twidjoy_drv = {
273 .description = DRIVER_DESC,
274 .id_table = twidjoy_serio_ids,
275 .interrupt = twidjoy_interrupt,
276 .connect = twidjoy_connect,
277 .disconnect = twidjoy_disconnect,
281 * The functions for inserting/removing us as a module.
284 int __init twidjoy_init(void)
286 serio_register_driver(&twidjoy_drv);
290 void __exit twidjoy_exit(void)
292 serio_unregister_driver(&twidjoy_drv);
295 module_init(twidjoy_init);
296 module_exit(twidjoy_exit);