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
39MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40MODULE_DESCRIPTION(DRIVER_DESC);
41MODULE_LICENSE("GPL");
42
43/*
44 * Constants.
45 */
46
47#define STINGER_MAX_LENGTH 8
48
49/*
50 * Per-Stinger data.
51 */
52
53struct 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
65static 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
97static 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
119static 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
135static 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
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	return serio_register_driver(&stinger_drv);
218}
219
220static void __exit stinger_exit(void)
221{
222	serio_unregister_driver(&stinger_drv);
223}
224
225module_init(stinger_init);
226module_exit(stinger_exit);
227