1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 2000-2001 Vojtech Pavlik
4 *  Copyright (c) 2000 Mark Fletcher
5 */
6
7/*
8 * Gravis Stinger gamepad driver for Linux
9 */
10
11/*
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/input.h>
18#include <linux/serio.h>
19
20#define DRIVER_DESC	"Gravis Stinger gamepad driver"
21
22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
23MODULE_DESCRIPTION(DRIVER_DESC);
24MODULE_LICENSE("GPL");
25
26/*
27 * Constants.
28 */
29
30#define STINGER_MAX_LENGTH 8
31
32/*
33 * Per-Stinger data.
34 */
35
36struct stinger {
37	struct input_dev *dev;
38	int idx;
39	unsigned char data[STINGER_MAX_LENGTH];
40	char phys[32];
41};
42
43/*
44 * stinger_process_packet() decodes packets the driver receives from the
45 * Stinger. It updates the data accordingly.
46 */
47
48static void stinger_process_packet(struct stinger *stinger)
49{
50	struct input_dev *dev = stinger->dev;
51	unsigned char *data = stinger->data;
52
53	if (!stinger->idx) return;
54
55	input_report_key(dev, BTN_A,	  ((data[0] & 0x20) >> 5));
56	input_report_key(dev, BTN_B,	  ((data[0] & 0x10) >> 4));
57	input_report_key(dev, BTN_C,	  ((data[0] & 0x08) >> 3));
58	input_report_key(dev, BTN_X,	  ((data[0] & 0x04) >> 2));
59	input_report_key(dev, BTN_Y,	  ((data[3] & 0x20) >> 5));
60	input_report_key(dev, BTN_Z,	  ((data[3] & 0x10) >> 4));
61	input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));
62	input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));
63	input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));
64	input_report_key(dev, BTN_START,   (data[3] & 0x01));
65
66	input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));
67	input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));
68
69	input_sync(dev);
70
71	return;
72}
73
74/*
75 * stinger_interrupt() is called by the low level driver when characters
76 * are ready for us. We then buffer them for further processing, or call the
77 * packet processing routine.
78 */
79
80static irqreturn_t stinger_interrupt(struct serio *serio,
81	unsigned char data, unsigned int flags)
82{
83	struct stinger *stinger = serio_get_drvdata(serio);
84
85	/* All Stinger packets are 4 bytes */
86
87	if (stinger->idx < STINGER_MAX_LENGTH)
88		stinger->data[stinger->idx++] = data;
89
90	if (stinger->idx == 4) {
91		stinger_process_packet(stinger);
92		stinger->idx = 0;
93	}
94
95	return IRQ_HANDLED;
96}
97
98/*
99 * stinger_disconnect() is the opposite of stinger_connect()
100 */
101
102static void stinger_disconnect(struct serio *serio)
103{
104	struct stinger *stinger = serio_get_drvdata(serio);
105
106	serio_close(serio);
107	serio_set_drvdata(serio, NULL);
108	input_unregister_device(stinger->dev);
109	kfree(stinger);
110}
111
112/*
113 * stinger_connect() is the routine that is called when someone adds a
114 * new serio device that supports Stinger protocol and registers it as
115 * an input device.
116 */
117
118static int stinger_connect(struct serio *serio, struct serio_driver *drv)
119{
120	struct stinger *stinger;
121	struct input_dev *input_dev;
122	int err = -ENOMEM;
123
124	stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);
125	input_dev = input_allocate_device();
126	if (!stinger || !input_dev)
127		goto fail1;
128
129	stinger->dev = input_dev;
130	snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);
131
132	input_dev->name = "Gravis Stinger";
133	input_dev->phys = stinger->phys;
134	input_dev->id.bustype = BUS_RS232;
135	input_dev->id.vendor = SERIO_STINGER;
136	input_dev->id.product = 0x0001;
137	input_dev->id.version = 0x0100;
138	input_dev->dev.parent = &serio->dev;
139
140	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
141	input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |
142		BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |
143		BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |
144		BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);
145	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);
146	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);
147
148	serio_set_drvdata(serio, stinger);
149
150	err = serio_open(serio, drv);
151	if (err)
152		goto fail2;
153
154	err = input_register_device(stinger->dev);
155	if (err)
156		goto fail3;
157
158	return 0;
159
160 fail3:	serio_close(serio);
161 fail2:	serio_set_drvdata(serio, NULL);
162 fail1:	input_free_device(input_dev);
163	kfree(stinger);
164	return err;
165}
166
167/*
168 * The serio driver structure.
169 */
170
171static const struct serio_device_id stinger_serio_ids[] = {
172	{
173		.type	= SERIO_RS232,
174		.proto	= SERIO_STINGER,
175		.id	= SERIO_ANY,
176		.extra	= SERIO_ANY,
177	},
178	{ 0 }
179};
180
181MODULE_DEVICE_TABLE(serio, stinger_serio_ids);
182
183static struct serio_driver stinger_drv = {
184	.driver		= {
185		.name	= "stinger",
186	},
187	.description	= DRIVER_DESC,
188	.id_table	= stinger_serio_ids,
189	.interrupt	= stinger_interrupt,
190	.connect	= stinger_connect,
191	.disconnect	= stinger_disconnect,
192};
193
194module_serio_driver(stinger_drv);
195