1/*
2 * $Id: stinger.c,v 1.1.1.1 2007/08/03 18:52:33 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)
68{
69	struct input_dev *dev = stinger->dev;
70	unsigned char *data = stinger->data;
71
72	if (!stinger->idx) return;
73
74	input_report_key(dev, BTN_A,	  ((data[0] & 0x20) >> 5));
75	input_report_key(dev, BTN_B,	  ((data[0] & 0x10) >> 4));
76	input_report_key(dev, BTN_C,	  ((data[0] & 0x08) >> 3));
77	input_report_key(dev, BTN_X,	  ((data[0] & 0x04) >> 2));
78	input_report_key(dev, BTN_Y,	  ((data[3] & 0x20) >> 5));
79	input_report_key(dev, BTN_Z,	  ((data[3] & 0x10) >> 4));
80	input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
81	input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
82	input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
83	input_report_key(dev, BTN_START,   (data[3] & 0x01));
84
85	input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
86	input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
87
88	input_sync(dev);
89
90	return;
91}
92
93/*
94 * stinger_interrupt() is called by the low level driver when characters
95 * are ready for us. We then buffer them for further processing, or call the
96 * packet processing routine.
97 */
98
99static irqreturn_t stinger_interrupt(struct serio *serio,
100	unsigned char data, unsigned int flags)
101{
102	struct stinger *stinger = serio_get_drvdata(serio);
103
104	/* All Stinger packets are 4 bytes */
105
106	if (stinger->idx < STINGER_MAX_LENGTH)
107		stinger->data[stinger->idx++] = data;
108
109	if (stinger->idx == 4) {
110		stinger_process_packet(stinger);
111		stinger->idx = 0;
112	}
113
114	return IRQ_HANDLED;
115}
116
117/*
118 * stinger_disconnect() is the opposite of stinger_connect()
119 */
120
121static void stinger_disconnect(struct serio *serio)
122{
123	struct stinger *stinger = serio_get_drvdata(serio);
124
125	serio_close(serio);
126	serio_set_drvdata(serio, NULL);
127	input_unregister_device(stinger->dev);
128	kfree(stinger);
129}
130
131/*
132 * stinger_connect() is the routine that is called when someone adds a
133 * new serio device that supports Stinger protocol and registers it as
134 * an input device.
135 */
136
137static int stinger_connect(struct serio *serio, struct serio_driver *drv)
138{
139	struct stinger *stinger;
140	struct input_dev *input_dev;
141	int err = -ENOMEM;
142
143	stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
144	input_dev = input_allocate_device();
145	if (!stinger || !input_dev)
146		goto fail1;
147
148	stinger->dev = input_dev;
149	snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
150
151	input_dev->name = "Gravis Stinger";
152	input_dev->phys = stinger->phys;
153	input_dev->id.bustype = BUS_RS232;
154	input_dev->id.vendor = SERIO_STINGER;
155	input_dev->id.product = 0x0001;
156	input_dev->id.version = 0x0100;
157	input_dev->dev.parent = &serio->dev;
158
159	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
160	input_dev->keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) |
161					 BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) |
162					 BIT(BTN_START) | BIT(BTN_SELECT);
163	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
164	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
165
166	serio_set_drvdata(serio, stinger);
167
168	err = serio_open(serio, drv);
169	if (err)
170		goto fail2;
171
172	err = input_register_device(stinger->dev);
173	if (err)
174		goto fail3;
175
176	return 0;
177
178 fail3:	serio_close(serio);
179 fail2:	serio_set_drvdata(serio, NULL);
180 fail1:	input_free_device(input_dev);
181	kfree(stinger);
182	return err;
183}
184
185/*
186 * The serio driver structure.
187 */
188
189static struct serio_device_id stinger_serio_ids[] = {
190	{
191		.type	= SERIO_RS232,
192		.proto	= SERIO_STINGER,
193		.id	= SERIO_ANY,
194		.extra	= SERIO_ANY,
195	},
196	{ 0 }
197};
198
199MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
200
201static struct serio_driver stinger_drv = {
202	.driver		= {
203		.name	= "stinger",
204	},
205	.description	= DRIVER_DESC,
206	.id_table	= stinger_serio_ids,
207	.interrupt	= stinger_interrupt,
208	.connect	= stinger_connect,
209	.disconnect	= stinger_disconnect,
210};
211
212/*
213 * The functions for inserting/removing us as a module.
214 */
215
216static int __init stinger_init(void)
217{
218	return serio_register_driver(&stinger_drv);
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