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(gameport: 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, code: guillemot->type->abs[i], value: data[i + 5]); |
118 | |
119 | if (guillemot->type->hat) { |
120 | input_report_abs(dev, ABS_HAT0X, value: guillemot_hat_to_axis[data[4] >> 4].x); |
121 | input_report_abs(dev, ABS_HAT0Y, value: 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, code: guillemot->type->btn[i], value: (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(gameport: 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(gameport: 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(size: 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, data: 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, handler: guillemot_poll); |
201 | gameport_set_poll_interval(gameport, msecs: 20); |
202 | |
203 | snprintf(buf: guillemot->phys, size: sizeof(guillemot->phys), fmt: "%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(dev: input_dev, data: 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(dev: input_dev, axis: t, min: 0, max: 255, fuzz: 0, flat: 0); |
223 | |
224 | if (guillemot->type->hat) { |
225 | input_set_abs_params(dev: input_dev, ABS_HAT0X, min: -1, max: 1, fuzz: 0, flat: 0); |
226 | input_set_abs_params(dev: input_dev, ABS_HAT0Y, min: -1, max: 1, fuzz: 0, flat: 0); |
227 | } |
228 | |
229 | for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++) |
230 | set_bit(nr: t, addr: 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(dev: input_dev); |
241 | kfree(objp: 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(objp: 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 | |