1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 2001 Vojtech Pavlik
4 *
5 *  Based on the work of:
6 *	Toby Deshane
7 */
8
9/*
10 * InterAct digital gamepad/joystick driver for Linux
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/gameport.h>
18#include <linux/input.h>
19#include <linux/jiffies.h>
20
21#define DRIVER_DESC	"InterAct digital joystick driver"
22
23MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
24MODULE_DESCRIPTION(DRIVER_DESC);
25MODULE_LICENSE("GPL");
26
27#define INTERACT_MAX_START	600	/* 400 us */
28#define INTERACT_MAX_STROBE	60	/* 40 us */
29#define INTERACT_MAX_LENGTH	32	/* 32 bits */
30
31#define INTERACT_TYPE_HHFX	0	/* HammerHead/FX */
32#define INTERACT_TYPE_PP8D	1	/* ProPad 8 */
33
34struct interact {
35	struct gameport *gameport;
36	struct input_dev *dev;
37	int bads;
38	int reads;
39	unsigned char type;
40	unsigned char length;
41	char phys[32];
42};
43
44static short interact_abs_hhfx[] =
45	{ ABS_RX, ABS_RY, ABS_X, ABS_Y, ABS_HAT0X, ABS_HAT0Y, -1 };
46static short interact_abs_pp8d[] =
47	{ ABS_X, ABS_Y, -1 };
48
49static short interact_btn_hhfx[] =
50	{ BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL, BTN_TL2, BTN_TR2, BTN_MODE, BTN_SELECT, -1 };
51static short interact_btn_pp8d[] =
52	{ BTN_C, BTN_TL, BTN_TR, BTN_A, BTN_B, BTN_Y, BTN_Z, BTN_X, -1 };
53
54struct interact_type {
55	int id;
56	short *abs;
57	short *btn;
58	char *name;
59	unsigned char length;
60	unsigned char b8;
61};
62
63static struct interact_type interact_type[] = {
64	{ 0x6202, interact_abs_hhfx, interact_btn_hhfx, "InterAct HammerHead/FX",    32, 4 },
65	{ 0x53f8, interact_abs_pp8d, interact_btn_pp8d, "InterAct ProPad 8 Digital", 16, 0 },
66	{ 0 }};
67
68/*
69 * interact_read_packet() reads and InterAct joystick data.
70 */
71
72static int interact_read_packet(struct gameport *gameport, int length, u32 *data)
73{
74	unsigned long flags;
75	unsigned char u, v;
76	unsigned int t, s;
77	int i;
78
79	i = 0;
80	data[0] = data[1] = data[2] = 0;
81	t = gameport_time(gameport, INTERACT_MAX_START);
82	s = gameport_time(gameport, INTERACT_MAX_STROBE);
83
84	local_irq_save(flags);
85	gameport_trigger(gameport);
86	v = gameport_read(gameport);
87
88	while (t > 0 && i < length) {
89		t--;
90		u = v; v = gameport_read(gameport);
91		if (v & ~u & 0x40) {
92			data[0] = (data[0] << 1) | ((v >> 4) & 1);
93			data[1] = (data[1] << 1) | ((v >> 5) & 1);
94			data[2] = (data[2] << 1) | ((v >> 7) & 1);
95			i++;
96			t = s;
97		}
98	}
99
100	local_irq_restore(flags);
101
102	return i;
103}
104
105/*
106 * interact_poll() reads and analyzes InterAct joystick data.
107 */
108
109static void interact_poll(struct gameport *gameport)
110{
111	struct interact *interact = gameport_get_drvdata(gameport);
112	struct input_dev *dev = interact->dev;
113	u32 data[3];
114	int i;
115
116	interact->reads++;
117
118	if (interact_read_packet(interact->gameport, interact->length, data) < interact->length) {
119		interact->bads++;
120	} else {
121
122		for (i = 0; i < 3; i++)
123			data[i] <<= INTERACT_MAX_LENGTH - interact->length;
124
125		switch (interact->type) {
126
127			case INTERACT_TYPE_HHFX:
128
129				for (i = 0; i < 4; i++)
130					input_report_abs(dev, interact_abs_hhfx[i], (data[i & 1] >> ((i >> 1) << 3)) & 0xff);
131
132				for (i = 0; i < 2; i++)
133					input_report_abs(dev, ABS_HAT0Y - i,
134						((data[1] >> ((i << 1) + 17)) & 1)  - ((data[1] >> ((i << 1) + 16)) & 1));
135
136				for (i = 0; i < 8; i++)
137					input_report_key(dev, interact_btn_hhfx[i], (data[0] >> (i + 16)) & 1);
138
139				for (i = 0; i < 4; i++)
140					input_report_key(dev, interact_btn_hhfx[i + 8], (data[1] >> (i + 20)) & 1);
141
142				break;
143
144			case INTERACT_TYPE_PP8D:
145
146				for (i = 0; i < 2; i++)
147					input_report_abs(dev, interact_abs_pp8d[i],
148						((data[0] >> ((i << 1) + 20)) & 1)  - ((data[0] >> ((i << 1) + 21)) & 1));
149
150				for (i = 0; i < 8; i++)
151					input_report_key(dev, interact_btn_pp8d[i], (data[1] >> (i + 16)) & 1);
152
153				break;
154		}
155	}
156
157	input_sync(dev);
158}
159
160/*
161 * interact_open() is a callback from the input open routine.
162 */
163
164static int interact_open(struct input_dev *dev)
165{
166	struct interact *interact = input_get_drvdata(dev);
167
168	gameport_start_polling(interact->gameport);
169	return 0;
170}
171
172/*
173 * interact_close() is a callback from the input close routine.
174 */
175
176static void interact_close(struct input_dev *dev)
177{
178	struct interact *interact = input_get_drvdata(dev);
179
180	gameport_stop_polling(interact->gameport);
181}
182
183/*
184 * interact_connect() probes for InterAct joysticks.
185 */
186
187static int interact_connect(struct gameport *gameport, struct gameport_driver *drv)
188{
189	struct interact *interact;
190	struct input_dev *input_dev;
191	__u32 data[3];
192	int i, t;
193	int err;
194
195	interact = kzalloc(sizeof(struct interact), GFP_KERNEL);
196	input_dev = input_allocate_device();
197	if (!interact || !input_dev) {
198		err = -ENOMEM;
199		goto fail1;
200	}
201
202	interact->gameport = gameport;
203	interact->dev = input_dev;
204
205	gameport_set_drvdata(gameport, interact);
206
207	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
208	if (err)
209		goto fail1;
210
211	i = interact_read_packet(gameport, INTERACT_MAX_LENGTH * 2, data);
212
213	if (i != 32 || (data[0] >> 24) != 0x0c || (data[1] >> 24) != 0x02) {
214		err = -ENODEV;
215		goto fail2;
216	}
217
218	for (i = 0; interact_type[i].length; i++)
219		if (interact_type[i].id == (data[2] >> 16))
220			break;
221
222	if (!interact_type[i].length) {
223		printk(KERN_WARNING "interact.c: Unknown joystick on %s. [len %d d0 %08x d1 %08x i2 %08x]\n",
224			gameport->phys, i, data[0], data[1], data[2]);
225		err = -ENODEV;
226		goto fail2;
227	}
228
229	gameport_set_poll_handler(gameport, interact_poll);
230	gameport_set_poll_interval(gameport, 20);
231
232	snprintf(interact->phys, sizeof(interact->phys), "%s/input0", gameport->phys);
233
234	interact->type = i;
235	interact->length = interact_type[i].length;
236
237	input_dev->name = interact_type[i].name;
238	input_dev->phys = interact->phys;
239	input_dev->id.bustype = BUS_GAMEPORT;
240	input_dev->id.vendor = GAMEPORT_ID_VENDOR_INTERACT;
241	input_dev->id.product = interact_type[i].id;
242	input_dev->id.version = 0x0100;
243	input_dev->dev.parent = &gameport->dev;
244
245	input_set_drvdata(input_dev, interact);
246
247	input_dev->open = interact_open;
248	input_dev->close = interact_close;
249
250	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
251
252	for (i = 0; (t = interact_type[interact->type].abs[i]) >= 0; i++) {
253		if (i < interact_type[interact->type].b8)
254			input_set_abs_params(input_dev, t, 0, 255, 0, 0);
255		else
256			input_set_abs_params(input_dev, t, -1, 1, 0, 0);
257	}
258
259	for (i = 0; (t = interact_type[interact->type].btn[i]) >= 0; i++)
260		__set_bit(t, input_dev->keybit);
261
262	err = input_register_device(interact->dev);
263	if (err)
264		goto fail2;
265
266	return 0;
267
268fail2:	gameport_close(gameport);
269fail1:  gameport_set_drvdata(gameport, NULL);
270	input_free_device(input_dev);
271	kfree(interact);
272	return err;
273}
274
275static void interact_disconnect(struct gameport *gameport)
276{
277	struct interact *interact = gameport_get_drvdata(gameport);
278
279	input_unregister_device(interact->dev);
280	gameport_close(gameport);
281	gameport_set_drvdata(gameport, NULL);
282	kfree(interact);
283}
284
285static struct gameport_driver interact_drv = {
286	.driver		= {
287		.name	= "interact",
288	},
289	.description	= DRIVER_DESC,
290	.connect	= interact_connect,
291	.disconnect	= interact_disconnect,
292};
293
294module_gameport_driver(interact_drv);
295