File: /usr/src/linux/drivers/char/joystick/stinger.c
1 /*
2 * $Id: stinger.c,v 1.4 2001/05/23 09:25:02 vojtech Exp $
3 *
4 * Copyright (c) 2000-2001 Vojtech Pavlik
5 * Copyright (c) 2000 Mark Fletcher
6 *
7 * Sponsored by SuSE
8 */
9
10 /*
11 * Gravis Stinger gamepad driver for Linux
12 */
13
14 /*
15 * This program is free warftware; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 *
29 * Should you need to contact me, the author, you can do so either by
30 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
31 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
32 */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/input.h>
38 #include <linux/serio.h>
39 #include <linux/init.h>
40
41 /*
42 * Constants.
43 */
44
45 #define STINGER_MAX_LENGTH 8
46
47 static char *stinger_name = "Gravis Stinger";
48
49 /*
50 * Per-Stinger data.
51 */
52
53 struct stinger {
54 struct input_dev dev;
55 int idx;
56 unsigned char data[STINGER_MAX_LENGTH];
57 };
58
59 /*
60 * stinger_process_packet() decodes packets the driver receives from the
61 * Stinger. It updates the data accordingly.
62 */
63
64 static void stinger_process_packet(struct stinger *stinger)
65 {
66 struct input_dev *dev = &stinger->dev;
67 unsigned char *data = stinger->data;
68
69 if (!stinger->idx) return;
70
71 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5));
72 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4));
73 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3));
74 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2));
75 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5));
76 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4));
77 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3));
78 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2));
79 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
80 input_report_key(dev, BTN_START, (data[3] & 0x01));
81
82 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
83 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
84
85 return;
86 }
87
88 /*
89 * stinger_interrupt() is called by the low level driver when characters
90 * are ready for us. We then buffer them for further processing, or call the
91 * packet processing routine.
92 */
93
94 static void stinger_interrupt(struct serio *serio, unsigned char data, unsigned int flags)
95 {
96 struct stinger* stinger = serio->private;
97
98 /* All Stinger packets are 4 bytes */
99
100 if (stinger->idx < STINGER_MAX_LENGTH)
101 stinger->data[stinger->idx++] = data;
102
103 if (stinger->idx == 4) {
104 stinger_process_packet(stinger);
105 stinger->idx = 0;
106 }
107
108 return;
109 }
110
111 /*
112 * stinger_disconnect() is the opposite of stinger_connect()
113 */
114
115 static void stinger_disconnect(struct serio *serio)
116 {
117 struct stinger* stinger = serio->private;
118 input_unregister_device(&stinger->dev);
119 serio_close(serio);
120 kfree(stinger);
121 }
122
123 /*
124 * stinger_connect() is the routine that is called when someone adds a
125 * new serio device. It looks for the Stinger, and if found, registers
126 * it as an input device.
127 */
128
129 static void stinger_connect(struct serio *serio, struct serio_dev *dev)
130 {
131 struct stinger *stinger;
132 int i;
133
134 if (serio->type != (SERIO_RS232 | SERIO_STINGER))
135 return;
136
137 if (!(stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL)))
138 return;
139
140 memset(stinger, 0, sizeof(struct stinger));
141
142 stinger->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
143 stinger->dev.keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) |
144 BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) |
145 BIT(BTN_START) | BIT(BTN_SELECT);
146 stinger->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
147
148 stinger->dev.name = stinger_name;
149 stinger->dev.idbus = BUS_RS232;
150 stinger->dev.idvendor = SERIO_STINGER;
151 stinger->dev.idproduct = 0x0001;
152 stinger->dev.idversion = 0x0100;
153
154 for (i = 0; i < 2; i++) {
155 stinger->dev.absmax[ABS_X+i] = 64;
156 stinger->dev.absmin[ABS_X+i] = -64;
157 stinger->dev.absflat[ABS_X+i] = 4;
158 }
159
160 stinger->dev.private = stinger;
161
162 serio->private = stinger;
163
164 if (serio_open(serio, dev)) {
165 kfree(stinger);
166 return;
167 }
168
169 input_register_device(&stinger->dev);
170
171 printk(KERN_INFO "input%d: %s on serio%d\n", stinger->dev.number, stinger_name, serio->number);
172 }
173
174 /*
175 * The serio device structure.
176 */
177
178 static struct serio_dev stinger_dev = {
179 interrupt: stinger_interrupt,
180 connect: stinger_connect,
181 disconnect: stinger_disconnect,
182 };
183
184 /*
185 * The functions for inserting/removing us as a module.
186 */
187
188 int __init stinger_init(void)
189 {
190 serio_register_device(&stinger_dev);
191 return 0;
192 }
193
194 void __exit stinger_exit(void)
195 {
196 serio_unregister_device(&stinger_dev);
197 }
198
199 module_init(stinger_init);
200 module_exit(stinger_exit);
201
202 MODULE_LICENSE("GPL");
203