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1 | /* | |
2 | * $Id: twidjoy.c,v 1.5 2002/01/22 20:31:53 vojtech Exp $ | |
3 | * | |
4 | * derived from CVS-ID "stinger.c,v 1.5 2001/05/29 12:57:18 vojtech Exp" | |
5 | * | |
6 | * Copyright (c) 2001 Arndt Schoenewald | |
7 | * Copyright (c) 2000-2001 Vojtech Pavlik | |
8 | * Copyright (c) 2000 Mark Fletcher | |
9 | * | |
10 | * Sponsored by Quelltext AG (http://www.quelltext-ag.de), Dortmund, Germany | |
11 | */ | |
12 | ||
13 | /* | |
14 | * Driver to use Handykey's Twiddler (the first edition, i.e. the one with | |
15 | * the RS232 interface) as a joystick under Linux | |
16 | * | |
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. | |
24 | * | |
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 :-) | |
30 | * | |
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! | |
33 | * | |
34 | * For questions or feedback regarding this driver module please contact: | |
35 | * Arndt Schoenewald <arndt@quelltext.com> | |
36 | */ | |
37 | ||
38 | /* | |
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. | |
43 | * | |
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. | |
48 | * | |
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 | |
52 | */ | |
53 | ||
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> | |
60 | ||
61 | #define DRIVER_DESC "Handykey Twiddler keyboard as a joystick driver" | |
62 | ||
63 | MODULE_DESCRIPTION(DRIVER_DESC); | |
64 | MODULE_LICENSE("GPL"); | |
65 | ||
66 | /* | |
67 | * Constants. | |
68 | */ | |
69 | ||
70 | #define TWIDJOY_MAX_LENGTH 5 | |
71 | ||
72 | static struct twidjoy_button_spec { | |
73 | int bitshift; | |
74 | int bitmask; | |
75 | int buttons[3]; | |
76 | } | |
77 | twidjoy_buttons[] = { | |
78 | { 0, 3, { BTN_A, BTN_B, BTN_C } }, | |
79 | { 2, 3, { BTN_X, BTN_Y, BTN_Z } }, | |
80 | { 4, 3, { BTN_TL, BTN_TR, BTN_TR2 } }, | |
81 | { 6, 3, { BTN_SELECT, BTN_START, BTN_MODE } }, | |
82 | { 8, 1, { BTN_BASE5 } }, | |
83 | { 9, 1, { BTN_BASE } }, | |
84 | { 10, 1, { BTN_BASE3 } }, | |
85 | { 11, 1, { BTN_BASE4 } }, | |
86 | { 12, 1, { BTN_BASE2 } }, | |
87 | { 13, 1, { BTN_BASE6 } }, | |
88 | { 0, 0, { 0 } } | |
89 | }; | |
90 | ||
91 | /* | |
92 | * Per-Twiddler data. | |
93 | */ | |
94 | ||
95 | struct twidjoy { | |
96 | struct input_dev *dev; | |
97 | int idx; | |
98 | unsigned char data[TWIDJOY_MAX_LENGTH]; | |
99 | char phys[32]; | |
100 | }; | |
101 | ||
102 | /* | |
103 | * twidjoy_process_packet() decodes packets the driver receives from the | |
104 | * Twiddler. It updates the data accordingly. | |
105 | */ | |
106 | ||
107 | static void twidjoy_process_packet(struct twidjoy *twidjoy) | |
108 | { | |
109 | struct input_dev *dev = twidjoy->dev; | |
110 | unsigned char *data = twidjoy->data; | |
111 | struct twidjoy_button_spec *bp; | |
112 | int button_bits, abs_x, abs_y; | |
113 | ||
114 | button_bits = ((data[1] & 0x7f) << 7) | (data[0] & 0x7f); | |
115 | ||
116 | for (bp = twidjoy_buttons; bp->bitmask; bp++) { | |
117 | int value = (button_bits & (bp->bitmask << bp->bitshift)) >> bp->bitshift; | |
118 | int i; | |
119 | ||
120 | for (i = 0; i < bp->bitmask; i++) | |
121 | input_report_key(dev, bp->buttons[i], i+1 == value); | |
122 | } | |
123 | ||
124 | abs_x = ((data[4] & 0x07) << 5) | ((data[3] & 0x7C) >> 2); | |
125 | if (data[4] & 0x08) abs_x -= 256; | |
126 | ||
127 | abs_y = ((data[3] & 0x01) << 7) | ((data[2] & 0x7F) >> 0); | |
128 | if (data[3] & 0x02) abs_y -= 256; | |
129 | ||
130 | input_report_abs(dev, ABS_X, -abs_x); | |
131 | input_report_abs(dev, ABS_Y, +abs_y); | |
132 | ||
133 | input_sync(dev); | |
134 | } | |
135 | ||
136 | /* | |
137 | * twidjoy_interrupt() is called by the low level driver when characters | |
138 | * are ready for us. We then buffer them for further processing, or call the | |
139 | * packet processing routine. | |
140 | */ | |
141 | ||
142 | static irqreturn_t twidjoy_interrupt(struct serio *serio, unsigned char data, unsigned int flags) | |
143 | { | |
144 | struct twidjoy *twidjoy = serio_get_drvdata(serio); | |
145 | ||
146 | /* All Twiddler packets are 5 bytes. The fact that the first byte | |
147 | * has a MSB of 0 and all other bytes have a MSB of 1 can be used | |
148 | * to check and regain sync. */ | |
149 | ||
150 | if ((data & 0x80) == 0) | |
151 | twidjoy->idx = 0; /* this byte starts a new packet */ | |
152 | else if (twidjoy->idx == 0) | |
153 | return IRQ_HANDLED; /* wrong MSB -- ignore this byte */ | |
154 | ||
155 | if (twidjoy->idx < TWIDJOY_MAX_LENGTH) | |
156 | twidjoy->data[twidjoy->idx++] = data; | |
157 | ||
158 | if (twidjoy->idx == TWIDJOY_MAX_LENGTH) { | |
159 | twidjoy_process_packet(twidjoy); | |
160 | twidjoy->idx = 0; | |
161 | } | |
162 | ||
163 | return IRQ_HANDLED; | |
164 | } | |
165 | ||
166 | /* | |
167 | * twidjoy_disconnect() is the opposite of twidjoy_connect() | |
168 | */ | |
169 | ||
170 | static void twidjoy_disconnect(struct serio *serio) | |
171 | { | |
172 | struct twidjoy *twidjoy = serio_get_drvdata(serio); | |
173 | ||
174 | serio_close(serio); | |
175 | serio_set_drvdata(serio, NULL); | |
176 | input_unregister_device(twidjoy->dev); | |
177 | kfree(twidjoy); | |
178 | } | |
179 | ||
180 | /* | |
181 | * twidjoy_connect() is the routine that is called when someone adds a | |
182 | * new serio device. It looks for the Twiddler, and if found, registers | |
183 | * it as an input device. | |
184 | */ | |
185 | ||
186 | static int twidjoy_connect(struct serio *serio, struct serio_driver *drv) | |
187 | { | |
188 | struct twidjoy_button_spec *bp; | |
189 | struct twidjoy *twidjoy; | |
190 | struct input_dev *input_dev; | |
191 | int err = -ENOMEM; | |
192 | int i; | |
193 | ||
194 | twidjoy = kzalloc(sizeof(struct twidjoy), GFP_KERNEL); | |
195 | input_dev = input_allocate_device(); | |
196 | if (!twidjoy || !input_dev) | |
197 | goto fail; | |
198 | ||
199 | twidjoy->dev = input_dev; | |
200 | snprintf(twidjoy->phys, sizeof(twidjoy->phys), "%s/input0", serio->phys); | |
201 | ||
202 | input_dev->name = "Handykey Twiddler"; | |
203 | input_dev->phys = twidjoy->phys; | |
204 | input_dev->id.bustype = BUS_RS232; | |
205 | input_dev->id.vendor = SERIO_TWIDJOY; | |
206 | input_dev->id.product = 0x0001; | |
207 | input_dev->id.version = 0x0100; | |
208 | input_dev->cdev.dev = &serio->dev; | |
209 | input_dev->private = twidjoy; | |
210 | ||
211 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); | |
212 | input_dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y); | |
213 | input_set_abs_params(input_dev, ABS_X, -50, 50, 4, 4); | |
214 | input_set_abs_params(input_dev, ABS_Y, -50, 50, 4, 4); | |
215 | ||
216 | for (bp = twidjoy_buttons; bp->bitmask; bp++) | |
217 | for (i = 0; i < bp->bitmask; i++) | |
218 | set_bit(bp->buttons[i], input_dev->keybit); | |
219 | ||
220 | serio_set_drvdata(serio, twidjoy); | |
221 | ||
222 | err = serio_open(serio, drv); | |
223 | if (err) | |
224 | goto fail; | |
225 | ||
226 | input_register_device(twidjoy->dev); | |
227 | return 0; | |
228 | ||
229 | fail: serio_set_drvdata(serio, NULL); | |
230 | input_free_device(input_dev); | |
231 | kfree(twidjoy); | |
232 | return err; | |
233 | } | |
234 | ||
235 | /* | |
236 | * The serio driver structure. | |
237 | */ | |
238 | ||
239 | static struct serio_device_id twidjoy_serio_ids[] = { | |
240 | { | |
241 | .type = SERIO_RS232, | |
242 | .proto = SERIO_TWIDJOY, | |
243 | .id = SERIO_ANY, | |
244 | .extra = SERIO_ANY, | |
245 | }, | |
246 | { 0 } | |
247 | }; | |
248 | ||
249 | MODULE_DEVICE_TABLE(serio, twidjoy_serio_ids); | |
250 | ||
251 | static struct serio_driver twidjoy_drv = { | |
252 | .driver = { | |
253 | .name = "twidjoy", | |
254 | }, | |
255 | .description = DRIVER_DESC, | |
256 | .id_table = twidjoy_serio_ids, | |
257 | .interrupt = twidjoy_interrupt, | |
258 | .connect = twidjoy_connect, | |
259 | .disconnect = twidjoy_disconnect, | |
260 | }; | |
261 | ||
262 | /* | |
263 | * The functions for inserting/removing us as a module. | |
264 | */ | |
265 | ||
266 | static int __init twidjoy_init(void) | |
267 | { | |
268 | serio_register_driver(&twidjoy_drv); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static void __exit twidjoy_exit(void) | |
273 | { | |
274 | serio_unregister_driver(&twidjoy_drv); | |
275 | } | |
276 | ||
277 | module_init(twidjoy_init); | |
278 | module_exit(twidjoy_exit); |