stinger.c revision 17dd3f0f7aa729a042af5d3318ff9b3e7781b45b 
1/*
2 * $Id: stinger.c,v 1.10 2002/01/22 20:29:31 vojtech Exp $
3 *
4 *  Copyright (c) 2000-2001 Vojtech Pavlik
5 *  Copyright (c) 2000 Mark Fletcher
6 */
7
8/*
9 * Gravis Stinger gamepad driver for Linux
10 */
11
12/*
13 * This program is free warftware; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 *  Should you need to contact me, the author, you can do so either by
28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
30 */
31
32#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/input.h>
36#include <linux/serio.h>
37#include <linux/init.h>
38
39#define DRIVER_DESC	"Gravis Stinger gamepad driver"
40
41MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
42MODULE_DESCRIPTION(DRIVER_DESC);
43MODULE_LICENSE("GPL");
44
45/*
46 * Constants.
47 */
48
49#define STINGER_MAX_LENGTH 8
50
51/*
52 * Per-Stinger data.
53 */
54
55struct stinger {
56	struct input_dev *dev;
57	int idx;
58	unsigned char data[STINGER_MAX_LENGTH];
59	char phys[32];
60};
61
62/*
63 * stinger_process_packet() decodes packets the driver receives from the
64 * Stinger. It updates the data accordingly.
65 */
66
67static void stinger_process_packet(struct stinger *stinger, struct pt_regs *regs)
68{
69	struct input_dev *dev = stinger->dev;
70	unsigned char *data = stinger->data;
71
72	if (!stinger->idx) return;
73
74	input_regs(dev, regs);
75
76	input_report_key(dev, BTN_A,	  ((data[0] & 0x20) >> 5));
77	input_report_key(dev, BTN_B,	  ((data[0] & 0x10) >> 4));
78	input_report_key(dev, BTN_C,	  ((data[0] & 0x08) >> 3));
79	input_report_key(dev, BTN_X,	  ((data[0] & 0x04) >> 2));
80	input_report_key(dev, BTN_Y,	  ((data[3] & 0x20) >> 5));
81	input_report_key(dev, BTN_Z,	  ((data[3] & 0x10) >> 4));
82	input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
83	input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
84	input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
85	input_report_key(dev, BTN_START,   (data[3] & 0x01));
86
87	input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
88	input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
89
90	input_sync(dev);
91
92	return;
93}
94
95/*
96 * stinger_interrupt() is called by the low level driver when characters
97 * are ready for us. We then buffer them for further processing, or call the
98 * packet processing routine.
99 */
100
101static irqreturn_t stinger_interrupt(struct serio *serio,
102	unsigned char data, unsigned int flags, struct pt_regs *regs)
103{
104	struct stinger *stinger = serio_get_drvdata(serio);
105
106	/* All Stinger packets are 4 bytes */
107
108	if (stinger->idx < STINGER_MAX_LENGTH)
109		stinger->data[stinger->idx++] = data;
110
111	if (stinger->idx == 4) {
112		stinger_process_packet(stinger, regs);
113		stinger->idx = 0;
114	}
115
116	return IRQ_HANDLED;
117}
118
119/*
120 * stinger_disconnect() is the opposite of stinger_connect()
121 */
122
123static void stinger_disconnect(struct serio *serio)
124{
125	struct stinger *stinger = serio_get_drvdata(serio);
126
127	serio_close(serio);
128	serio_set_drvdata(serio, NULL);
129	input_unregister_device(stinger->dev);
130	kfree(stinger);
131}
132
133/*
134 * stinger_connect() is the routine that is called when someone adds a
135 * new serio device that supports Stinger protocol and registers it as
136 * an input device.
137 */
138
139static int stinger_connect(struct serio *serio, struct serio_driver *drv)
140{
141	struct stinger *stinger;
142	struct input_dev *input_dev;
143	int err = -ENOMEM;
144
145	stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
146	input_dev = input_allocate_device();
147	if (!stinger || !input_dev)
148		goto fail;
149
150	stinger->dev = input_dev;
151	sprintf(stinger->phys, "%s/serio0", serio->phys);
152
153	input_dev->name = "Gravis Stinger";
154	input_dev->phys = stinger->phys;
155	input_dev->id.bustype = BUS_RS232;
156	input_dev->id.vendor = SERIO_STINGER;
157	input_dev->id.product = 0x0001;
158	input_dev->id.version = 0x0100;
159	input_dev->cdev.dev = &serio->dev;
160	input_dev->private = stinger;
161
162	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
163	input_dev->keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) |
164					 BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) |
165					 BIT(BTN_START) | BIT(BTN_SELECT);
166	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
167	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
168
169	serio_set_drvdata(serio, stinger);
170
171	err = serio_open(serio, drv);
172	if (err)
173		goto fail;
174
175	input_register_device(stinger->dev);
176	return 0;
177
178 fail:	serio_set_drvdata(serio, NULL);
179	input_free_device(input_dev);
180	kfree(stinger);
181	return err;
182}
183
184/*
185 * The serio driver structure.
186 */
187
188static 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
198MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
199
200static 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
215static int __init stinger_init(void)
216{
217	serio_register_driver(&stinger_drv);
218	return 0;
219}
220
221static void __exit stinger_exit(void)
222{
223	serio_unregister_driver(&stinger_drv);
224}
225
226module_init(stinger_init);
227module_exit(stinger_exit);
228