1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Copyright (c) 2001 Vojtech Pavlik
4  */
5 
6 /*
7  * Guillemot Digital Interface Protocol driver for Linux
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/gameport.h>
15 #include <linux/input.h>
16 #include <linux/jiffies.h>
17 
18 #define DRIVER_DESC	"Guillemot Digital joystick driver"
19 
20 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
21 MODULE_DESCRIPTION(DRIVER_DESC);
22 MODULE_LICENSE("GPL");
23 
24 #define GUILLEMOT_MAX_START	600	/* 600 us */
25 #define GUILLEMOT_MAX_STROBE	60	/* 60 us */
26 #define GUILLEMOT_MAX_LENGTH	17	/* 17 bytes */
27 
28 static short guillemot_abs_pad[] =
29 	{ ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, -1 };
30 
31 static short guillemot_btn_pad[] =
32 	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_MODE, BTN_SELECT, -1 };
33 
34 static struct {
35         int x;
36         int y;
37 } guillemot_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
38 
39 struct guillemot_type {
40 	unsigned char id;
41 	short *abs;
42 	short *btn;
43 	int hat;
44 	char *name;
45 };
46 
47 struct guillemot {
48 	struct gameport *gameport;
49 	struct input_dev *dev;
50 	int bads;
51 	int reads;
52 	struct guillemot_type *type;
53 	unsigned char length;
54 	char phys[32];
55 };
56 
57 static struct guillemot_type guillemot_type[] = {
58 	{ 0x00, guillemot_abs_pad, guillemot_btn_pad, 1, "Guillemot Pad" },
59 	{ 0 }};
60 
61 /*
62  * guillemot_read_packet() reads Guillemot joystick data.
63  */
64 
65 static int guillemot_read_packet(struct gameport *gameport, u8 *data)
66 {
67 	unsigned long flags;
68 	unsigned char u, v;
69 	unsigned int t, s;
70 	int i;
71 
72 	for (i = 0; i < GUILLEMOT_MAX_LENGTH; i++)
73 		data[i] = 0;
74 
75 	i = 0;
76 	t = gameport_time(gameport, GUILLEMOT_MAX_START);
77 	s = gameport_time(gameport, GUILLEMOT_MAX_STROBE);
78 
79 	local_irq_save(flags);
80 	gameport_trigger(gameport);
81 	v = gameport_read(gameport);
82 
83 	while (t > 0 && i < GUILLEMOT_MAX_LENGTH * 8) {
84 		t--;
85 		u = v; v = gameport_read(gameport);
86 		if (v & ~u & 0x10) {
87 			data[i >> 3] |= ((v >> 5) & 1) << (i & 7);
88 			i++;
89 			t = s;
90 		}
91 	}
92 
93 	local_irq_restore(flags);
94 
95 	return i;
96 }
97 
98 /*
99  * guillemot_poll() reads and analyzes Guillemot joystick data.
100  */
101 
102 static void guillemot_poll(struct gameport *gameport)
103 {
104 	struct guillemot *guillemot = gameport_get_drvdata(gameport);
105 	struct input_dev *dev = guillemot->dev;
106 	u8 data[GUILLEMOT_MAX_LENGTH];
107 	int i;
108 
109 	guillemot->reads++;
110 
111 	if (guillemot_read_packet(guillemot->gameport, data) != GUILLEMOT_MAX_LENGTH * 8 ||
112 		data[0] != 0x55 || data[16] != 0xaa) {
113 		guillemot->bads++;
114 	} else {
115 
116 		for (i = 0; i < 6 && guillemot->type->abs[i] >= 0; i++)
117 			input_report_abs(dev, guillemot->type->abs[i], data[i + 5]);
118 
119 		if (guillemot->type->hat) {
120 			input_report_abs(dev, ABS_HAT0X, guillemot_hat_to_axis[data[4] >> 4].x);
121 			input_report_abs(dev, ABS_HAT0Y, guillemot_hat_to_axis[data[4] >> 4].y);
122 		}
123 
124 		for (i = 0; i < 16 && guillemot->type->btn[i] >= 0; i++)
125 			input_report_key(dev, guillemot->type->btn[i], (data[2 + (i >> 3)] >> (i & 7)) & 1);
126 	}
127 
128 	input_sync(dev);
129 }
130 
131 /*
132  * guillemot_open() is a callback from the input open routine.
133  */
134 
135 static int guillemot_open(struct input_dev *dev)
136 {
137 	struct guillemot *guillemot = input_get_drvdata(dev);
138 
139 	gameport_start_polling(guillemot->gameport);
140 	return 0;
141 }
142 
143 /*
144  * guillemot_close() is a callback from the input close routine.
145  */
146 
147 static void guillemot_close(struct input_dev *dev)
148 {
149 	struct guillemot *guillemot = input_get_drvdata(dev);
150 
151 	gameport_stop_polling(guillemot->gameport);
152 }
153 
154 /*
155  * guillemot_connect() probes for Guillemot joysticks.
156  */
157 
158 static int guillemot_connect(struct gameport *gameport, struct gameport_driver *drv)
159 {
160 	struct guillemot *guillemot;
161 	struct input_dev *input_dev;
162 	u8 data[GUILLEMOT_MAX_LENGTH];
163 	int i, t;
164 	int err;
165 
166 	guillemot = kzalloc(sizeof(struct guillemot), GFP_KERNEL);
167 	input_dev = input_allocate_device();
168 	if (!guillemot || !input_dev) {
169 		err = -ENOMEM;
170 		goto fail1;
171 	}
172 
173 	guillemot->gameport = gameport;
174 	guillemot->dev = input_dev;
175 
176 	gameport_set_drvdata(gameport, guillemot);
177 
178 	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
179 	if (err)
180 		goto fail1;
181 
182 	i = guillemot_read_packet(gameport, data);
183 
184 	if (i != GUILLEMOT_MAX_LENGTH * 8 || data[0] != 0x55 || data[16] != 0xaa) {
185 		err = -ENODEV;
186 		goto fail2;
187 	}
188 
189 	for (i = 0; guillemot_type[i].name; i++)
190 		if (guillemot_type[i].id == data[11])
191 			break;
192 
193 	if (!guillemot_type[i].name) {
194 		printk(KERN_WARNING "guillemot.c: Unknown joystick on %s. [ %02x%02x:%04x, ver %d.%02d ]\n",
195 			gameport->phys, data[12], data[13], data[11], data[14], data[15]);
196 		err = -ENODEV;
197 		goto fail2;
198 	}
199 
200 	gameport_set_poll_handler(gameport, guillemot_poll);
201 	gameport_set_poll_interval(gameport, 20);
202 
203 	snprintf(guillemot->phys, sizeof(guillemot->phys), "%s/input0", gameport->phys);
204 	guillemot->type = guillemot_type + i;
205 
206 	input_dev->name = guillemot_type[i].name;
207 	input_dev->phys = guillemot->phys;
208 	input_dev->id.bustype = BUS_GAMEPORT;
209 	input_dev->id.vendor = GAMEPORT_ID_VENDOR_GUILLEMOT;
210 	input_dev->id.product = guillemot_type[i].id;
211 	input_dev->id.version = (int)data[14] << 8 | data[15];
212 	input_dev->dev.parent = &gameport->dev;
213 
214 	input_set_drvdata(input_dev, guillemot);
215 
216 	input_dev->open = guillemot_open;
217 	input_dev->close = guillemot_close;
218 
219 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
220 
221 	for (i = 0; (t = guillemot->type->abs[i]) >= 0; i++)
222 		input_set_abs_params(input_dev, t, 0, 255, 0, 0);
223 
224 	if (guillemot->type->hat) {
225 		input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);
226 		input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);
227 	}
228 
229 	for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++)
230 		set_bit(t, input_dev->keybit);
231 
232 	err = input_register_device(guillemot->dev);
233 	if (err)
234 		goto fail2;
235 
236 	return 0;
237 
238 fail2:	gameport_close(gameport);
239 fail1:  gameport_set_drvdata(gameport, NULL);
240 	input_free_device(input_dev);
241 	kfree(guillemot);
242 	return err;
243 }
244 
245 static void guillemot_disconnect(struct gameport *gameport)
246 {
247 	struct guillemot *guillemot = gameport_get_drvdata(gameport);
248 
249 	printk(KERN_INFO "guillemot.c: Failed %d reads out of %d on %s\n", guillemot->reads, guillemot->bads, guillemot->phys);
250 	input_unregister_device(guillemot->dev);
251 	gameport_close(gameport);
252 	kfree(guillemot);
253 }
254 
255 static struct gameport_driver guillemot_drv = {
256 	.driver		= {
257 		.name	= "guillemot",
258 	},
259 	.description	= DRIVER_DESC,
260 	.connect	= guillemot_connect,
261 	.disconnect	= guillemot_disconnect,
262 };
263 
264 module_gameport_driver(guillemot_drv);
265