xref: /openbmc/linux/drivers/input/joystick/stinger.c (revision f220d3eb)
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 
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/input.h>
30 #include <linux/serio.h>
31 
32 #define DRIVER_DESC	"Gravis Stinger gamepad driver"
33 
34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
35 MODULE_DESCRIPTION(DRIVER_DESC);
36 MODULE_LICENSE("GPL");
37 
38 /*
39  * Constants.
40  */
41 
42 #define STINGER_MAX_LENGTH 8
43 
44 /*
45  * Per-Stinger data.
46  */
47 
48 struct stinger {
49 	struct input_dev *dev;
50 	int idx;
51 	unsigned char data[STINGER_MAX_LENGTH];
52 	char phys[32];
53 };
54 
55 /*
56  * stinger_process_packet() decodes packets the driver receives from the
57  * Stinger. It updates the data accordingly.
58  */
59 
60 static void stinger_process_packet(struct stinger *stinger)
61 {
62 	struct input_dev *dev = stinger->dev;
63 	unsigned char *data = stinger->data;
64 
65 	if (!stinger->idx) return;
66 
67 	input_report_key(dev, BTN_A,	  ((data[0] & 0x20) >> 5));
68 	input_report_key(dev, BTN_B,	  ((data[0] & 0x10) >> 4));
69 	input_report_key(dev, BTN_C,	  ((data[0] & 0x08) >> 3));
70 	input_report_key(dev, BTN_X,	  ((data[0] & 0x04) >> 2));
71 	input_report_key(dev, BTN_Y,	  ((data[3] & 0x20) >> 5));
72 	input_report_key(dev, BTN_Z,	  ((data[3] & 0x10) >> 4));
73 	input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
74 	input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
75 	input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
76 	input_report_key(dev, BTN_START,   (data[3] & 0x01));
77 
78 	input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
79 	input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
80 
81 	input_sync(dev);
82 
83 	return;
84 }
85 
86 /*
87  * stinger_interrupt() is called by the low level driver when characters
88  * are ready for us. We then buffer them for further processing, or call the
89  * packet processing routine.
90  */
91 
92 static irqreturn_t stinger_interrupt(struct serio *serio,
93 	unsigned char data, unsigned int flags)
94 {
95 	struct stinger *stinger = serio_get_drvdata(serio);
96 
97 	/* All Stinger packets are 4 bytes */
98 
99 	if (stinger->idx < STINGER_MAX_LENGTH)
100 		stinger->data[stinger->idx++] = data;
101 
102 	if (stinger->idx == 4) {
103 		stinger_process_packet(stinger);
104 		stinger->idx = 0;
105 	}
106 
107 	return IRQ_HANDLED;
108 }
109 
110 /*
111  * stinger_disconnect() is the opposite of stinger_connect()
112  */
113 
114 static void stinger_disconnect(struct serio *serio)
115 {
116 	struct stinger *stinger = serio_get_drvdata(serio);
117 
118 	serio_close(serio);
119 	serio_set_drvdata(serio, NULL);
120 	input_unregister_device(stinger->dev);
121 	kfree(stinger);
122 }
123 
124 /*
125  * stinger_connect() is the routine that is called when someone adds a
126  * new serio device that supports Stinger protocol and registers it as
127  * an input device.
128  */
129 
130 static int stinger_connect(struct serio *serio, struct serio_driver *drv)
131 {
132 	struct stinger *stinger;
133 	struct input_dev *input_dev;
134 	int err = -ENOMEM;
135 
136 	stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
137 	input_dev = input_allocate_device();
138 	if (!stinger || !input_dev)
139 		goto fail1;
140 
141 	stinger->dev = input_dev;
142 	snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
143 
144 	input_dev->name = "Gravis Stinger";
145 	input_dev->phys = stinger->phys;
146 	input_dev->id.bustype = BUS_RS232;
147 	input_dev->id.vendor = SERIO_STINGER;
148 	input_dev->id.product = 0x0001;
149 	input_dev->id.version = 0x0100;
150 	input_dev->dev.parent = &serio->dev;
151 
152 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
153 	input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
154 		BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
155 		BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
156 		BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
157 	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
158 	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
159 
160 	serio_set_drvdata(serio, stinger);
161 
162 	err = serio_open(serio, drv);
163 	if (err)
164 		goto fail2;
165 
166 	err = input_register_device(stinger->dev);
167 	if (err)
168 		goto fail3;
169 
170 	return 0;
171 
172  fail3:	serio_close(serio);
173  fail2:	serio_set_drvdata(serio, NULL);
174  fail1:	input_free_device(input_dev);
175 	kfree(stinger);
176 	return err;
177 }
178 
179 /*
180  * The serio driver structure.
181  */
182 
183 static const struct serio_device_id stinger_serio_ids[] = {
184 	{
185 		.type	= SERIO_RS232,
186 		.proto	= SERIO_STINGER,
187 		.id	= SERIO_ANY,
188 		.extra	= SERIO_ANY,
189 	},
190 	{ 0 }
191 };
192 
193 MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
194 
195 static struct serio_driver stinger_drv = {
196 	.driver		= {
197 		.name	= "stinger",
198 	},
199 	.description	= DRIVER_DESC,
200 	.id_table	= stinger_serio_ids,
201 	.interrupt	= stinger_interrupt,
202 	.connect	= stinger_connect,
203 	.disconnect	= stinger_disconnect,
204 };
205 
206 module_serio_driver(stinger_drv);
207