1 /*
2 * Copyright (c) 2000-2001 Vojtech Pavlik
3 * Copyright (c) 2000 Mark Fletcher
4 */
5
6 /*
7 * Gravis Stinger gamepad driver for Linux
8 */
9
10 /*
11 * This program is free warftware; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 *
25 * Should you need to contact me, the author, you can do so either by
26 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
27 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
28 */
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/slab.h>
33 #include <linux/input.h>
34 #include <linux/serio.h>
35 #include <linux/init.h>
36
37 #define DRIVER_DESC "Gravis Stinger gamepad driver"
38
39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40 MODULE_DESCRIPTION(DRIVER_DESC);
41 MODULE_LICENSE("GPL");
42
43 /*
44 * Constants.
45 */
46
47 #define STINGER_MAX_LENGTH 8
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 char phys[32];
58 };
59
60 /*
61 * stinger_process_packet() decodes packets the driver receives from the
62 * Stinger. It updates the data accordingly.
63 */
64
65 static void stinger_process_packet(struct stinger *stinger)
66 {
67 struct input_dev *dev = stinger->dev;
68 unsigned char *data = stinger->data;
69
70 if (!stinger->idx) return;
71
72 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5));
73 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4));
74 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3));
75 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2));
76 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5));
77 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4));
78 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3));
79 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2));
80 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
81 input_report_key(dev, BTN_START, (data[3] & 0x01));
82
83 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
84 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
85
86 input_sync(dev);
87
88 return;
89 }
90
91 /*
92 * stinger_interrupt() is called by the low level driver when characters
93 * are ready for us. We then buffer them for further processing, or call the
94 * packet processing routine.
95 */
96
97 static irqreturn_t stinger_interrupt(struct serio *serio,
98 unsigned char data, unsigned int flags)
99 {
100 struct stinger *stinger = serio_get_drvdata(serio);
101
102 /* All Stinger packets are 4 bytes */
103
104 if (stinger->idx < STINGER_MAX_LENGTH)
105 stinger->data[stinger->idx++] = data;
106
107 if (stinger->idx == 4) {
108 stinger_process_packet(stinger);
109 stinger->idx = 0;
110 }
111
112 return IRQ_HANDLED;
113 }
114
115 /*
116 * stinger_disconnect() is the opposite of stinger_connect()
117 */
118
119 static void stinger_disconnect(struct serio *serio)
120 {
121 struct stinger *stinger = serio_get_drvdata(serio);
122
123 serio_close(serio);
124 serio_set_drvdata(serio, NULL);
125 input_unregister_device(stinger->dev);
126 kfree(stinger);
127 }
128
129 /*
130 * stinger_connect() is the routine that is called when someone adds a
131 * new serio device that supports Stinger protocol and registers it as
132 * an input device.
133 */
134
135 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
136 {
137 struct stinger *stinger;
138 struct input_dev *input_dev;
139 int err = -ENOMEM;
140
141 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
142 input_dev = input_allocate_device();
143 if (!stinger || !input_dev)
144 goto fail1;
145
146 stinger->dev = input_dev;
147 snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
148
149 input_dev->name = "Gravis Stinger";
150 input_dev->phys = stinger->phys;
151 input_dev->id.bustype = BUS_RS232;
152 input_dev->id.vendor = SERIO_STINGER;
153 input_dev->id.product = 0x0001;
154 input_dev->id.version = 0x0100;
155 input_dev->dev.parent = &serio->dev;
156
157 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
158 input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
159 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
160 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
161 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
162 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
163 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
164
165 serio_set_drvdata(serio, stinger);
166
167 err = serio_open(serio, drv);
168 if (err)
169 goto fail2;
170
171 err = input_register_device(stinger->dev);
172 if (err)
173 goto fail3;
174
175 return 0;
176
177 fail3: serio_close(serio);
178 fail2: serio_set_drvdata(serio, NULL);
179 fail1: input_free_device(input_dev);
180 kfree(stinger);
181 return err;
182 }
183
184 /*
185 * The serio driver structure.
186 */
187
188 static struct serio_device_id stinger_serio_ids[] = {
189 {
190 .type = SERIO_RS232,
191 .proto = SERIO_STINGER,
192 .id = SERIO_ANY,
193 .extra = SERIO_ANY,
194 },
195 { 0 }
196 };
197
198 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
199
200 static struct serio_driver stinger_drv = {
201 .driver = {
202 .name = "stinger",
203 },
204 .description = DRIVER_DESC,
205 .id_table = stinger_serio_ids,
206 .interrupt = stinger_interrupt,
207 .connect = stinger_connect,
208 .disconnect = stinger_disconnect,
209 };
210
211 /*
212 * The functions for inserting/removing us as a module.
213 */
214
215 static int __init stinger_init(void)
216 {
217 return serio_register_driver(&stinger_drv);
218 }
219
220 static void __exit stinger_exit(void)
221 {
222 serio_unregister_driver(&stinger_drv);
223 }
224
225 module_init(stinger_init);
226 module_exit(stinger_exit);
227
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