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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (c) 1998-2001 Vojtech Pavlik |
4 | */ | |
5 | ||
6 | /* | |
7 | * PDPI Lightning 4 gamecard driver for Linux. | |
8 | */ | |
9 | ||
10 | /* | |
1da177e4 LT |
11 | */ |
12 | ||
13 | #include <asm/io.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/gameport.h> | |
1da177e4 LT |
21 | |
22 | #define L4_PORT 0x201 | |
23 | #define L4_SELECT_ANALOG 0xa4 | |
24 | #define L4_SELECT_DIGITAL 0xa5 | |
25 | #define L4_SELECT_SECONDARY 0xa6 | |
26 | #define L4_CMD_ID 0x80 | |
27 | #define L4_CMD_GETCAL 0x92 | |
28 | #define L4_CMD_SETCAL 0x93 | |
29 | #define L4_ID 0x04 | |
30 | #define L4_BUSY 0x01 | |
31 | #define L4_TIMEOUT 80 /* 80 us */ | |
32 | ||
33 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
34 | MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
37 | struct l4 { | |
38 | struct gameport *gameport; | |
39 | unsigned char port; | |
40 | }; | |
41 | ||
42 | static struct l4 l4_ports[8]; | |
43 | ||
44 | /* | |
45 | * l4_wait_ready() waits for the L4 to become ready. | |
46 | */ | |
47 | ||
48 | static int l4_wait_ready(void) | |
49 | { | |
50 | unsigned int t = L4_TIMEOUT; | |
51 | ||
52 | while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--; | |
53 | return -(t <= 0); | |
54 | } | |
55 | ||
56 | /* | |
57 | * l4_cooked_read() reads data from the Lightning 4. | |
58 | */ | |
59 | ||
60 | static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons) | |
61 | { | |
62 | struct l4 *l4 = gameport->port_data; | |
63 | unsigned char status; | |
64 | int i, result = -1; | |
65 | ||
66 | outb(L4_SELECT_ANALOG, L4_PORT); | |
67 | outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT); | |
68 | ||
69 | if (inb(L4_PORT) & L4_BUSY) goto fail; | |
70 | outb(l4->port & 3, L4_PORT); | |
71 | ||
72 | if (l4_wait_ready()) goto fail; | |
73 | status = inb(L4_PORT); | |
74 | ||
75 | for (i = 0; i < 4; i++) | |
76 | if (status & (1 << i)) { | |
77 | if (l4_wait_ready()) goto fail; | |
78 | axes[i] = inb(L4_PORT); | |
79 | if (axes[i] > 252) axes[i] = -1; | |
80 | } | |
81 | ||
82 | if (status & 0x10) { | |
83 | if (l4_wait_ready()) goto fail; | |
84 | *buttons = inb(L4_PORT) & 0x0f; | |
85 | } | |
86 | ||
87 | result = 0; | |
88 | ||
89 | fail: outb(L4_SELECT_ANALOG, L4_PORT); | |
90 | return result; | |
91 | } | |
92 | ||
93 | static int l4_open(struct gameport *gameport, int mode) | |
94 | { | |
95 | struct l4 *l4 = gameport->port_data; | |
96 | ||
97 | if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED) | |
98 | return -1; | |
99 | outb(L4_SELECT_ANALOG, L4_PORT); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | /* | |
104 | * l4_getcal() reads the L4 with calibration values. | |
105 | */ | |
106 | ||
107 | static int l4_getcal(int port, int *cal) | |
108 | { | |
109 | int i, result = -1; | |
110 | ||
111 | outb(L4_SELECT_ANALOG, L4_PORT); | |
112 | outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT); | |
113 | if (inb(L4_PORT) & L4_BUSY) | |
114 | goto out; | |
115 | ||
116 | outb(L4_CMD_GETCAL, L4_PORT); | |
117 | if (l4_wait_ready()) | |
118 | goto out; | |
119 | ||
120 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) | |
121 | goto out; | |
122 | ||
123 | if (l4_wait_ready()) | |
124 | goto out; | |
125 | outb(port & 3, L4_PORT); | |
126 | ||
127 | for (i = 0; i < 4; i++) { | |
128 | if (l4_wait_ready()) | |
129 | goto out; | |
130 | cal[i] = inb(L4_PORT); | |
131 | } | |
132 | ||
133 | result = 0; | |
134 | ||
135 | out: outb(L4_SELECT_ANALOG, L4_PORT); | |
136 | return result; | |
137 | } | |
138 | ||
139 | /* | |
140 | * l4_setcal() programs the L4 with calibration values. | |
141 | */ | |
142 | ||
143 | static int l4_setcal(int port, int *cal) | |
144 | { | |
145 | int i, result = -1; | |
146 | ||
147 | outb(L4_SELECT_ANALOG, L4_PORT); | |
148 | outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT); | |
149 | if (inb(L4_PORT) & L4_BUSY) | |
150 | goto out; | |
151 | ||
152 | outb(L4_CMD_SETCAL, L4_PORT); | |
153 | if (l4_wait_ready()) | |
154 | goto out; | |
155 | ||
156 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) | |
157 | goto out; | |
158 | ||
159 | if (l4_wait_ready()) | |
160 | goto out; | |
161 | outb(port & 3, L4_PORT); | |
162 | ||
163 | for (i = 0; i < 4; i++) { | |
164 | if (l4_wait_ready()) | |
165 | goto out; | |
166 | outb(cal[i], L4_PORT); | |
167 | } | |
168 | ||
169 | result = 0; | |
170 | ||
171 | out: outb(L4_SELECT_ANALOG, L4_PORT); | |
172 | return result; | |
173 | } | |
174 | ||
175 | /* | |
176 | * l4_calibrate() calibrates the L4 for the attached device, so | |
177 | * that the device's resistance fits into the L4's 8-bit range. | |
178 | */ | |
179 | ||
180 | static int l4_calibrate(struct gameport *gameport, int *axes, int *max) | |
181 | { | |
182 | int i, t; | |
183 | int cal[4]; | |
184 | struct l4 *l4 = gameport->port_data; | |
185 | ||
186 | if (l4_getcal(l4->port, cal)) | |
187 | return -1; | |
188 | ||
189 | for (i = 0; i < 4; i++) { | |
190 | t = (max[i] * cal[i]) / 200; | |
191 | t = (t < 1) ? 1 : ((t > 255) ? 255 : t); | |
192 | axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t; | |
193 | axes[i] = (axes[i] > 252) ? 252 : axes[i]; | |
194 | cal[i] = t; | |
195 | } | |
196 | ||
197 | if (l4_setcal(l4->port, cal)) | |
198 | return -1; | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static int __init l4_create_ports(int card_no) | |
204 | { | |
205 | struct l4 *l4; | |
206 | struct gameport *port; | |
207 | int i, idx; | |
208 | ||
209 | for (i = 0; i < 4; i++) { | |
210 | ||
211 | idx = card_no * 4 + i; | |
212 | l4 = &l4_ports[idx]; | |
213 | ||
214 | if (!(l4->gameport = port = gameport_allocate_port())) { | |
215 | printk(KERN_ERR "lightning: Memory allocation failed\n"); | |
216 | while (--i >= 0) { | |
217 | gameport_free_port(l4->gameport); | |
218 | l4->gameport = NULL; | |
219 | } | |
220 | return -ENOMEM; | |
221 | } | |
222 | l4->port = idx; | |
223 | ||
224 | port->port_data = l4; | |
225 | port->open = l4_open; | |
226 | port->cooked_read = l4_cooked_read; | |
227 | port->calibrate = l4_calibrate; | |
228 | ||
229 | gameport_set_name(port, "PDPI Lightning 4"); | |
230 | gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx); | |
231 | ||
232 | if (idx == 0) | |
233 | port->io = L4_PORT; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int __init l4_add_card(int card_no) | |
240 | { | |
241 | int cal[4] = { 255, 255, 255, 255 }; | |
242 | int i, rev, result; | |
243 | struct l4 *l4; | |
244 | ||
245 | outb(L4_SELECT_ANALOG, L4_PORT); | |
246 | outb(L4_SELECT_DIGITAL + card_no, L4_PORT); | |
247 | ||
248 | if (inb(L4_PORT) & L4_BUSY) | |
249 | return -1; | |
250 | outb(L4_CMD_ID, L4_PORT); | |
251 | ||
252 | if (l4_wait_ready()) | |
253 | return -1; | |
254 | ||
255 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no) | |
256 | return -1; | |
257 | ||
258 | if (l4_wait_ready()) | |
259 | return -1; | |
260 | if (inb(L4_PORT) != L4_ID) | |
261 | return -1; | |
262 | ||
263 | if (l4_wait_ready()) | |
264 | return -1; | |
265 | rev = inb(L4_PORT); | |
266 | ||
267 | if (!rev) | |
268 | return -1; | |
269 | ||
270 | result = l4_create_ports(card_no); | |
271 | if (result) | |
272 | return result; | |
273 | ||
274 | printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n", | |
275 | card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT); | |
276 | ||
277 | for (i = 0; i < 4; i++) { | |
278 | l4 = &l4_ports[card_no * 4 + i]; | |
279 | ||
280 | if (rev > 0x28) /* on 2.9+ the setcal command works correctly */ | |
281 | l4_setcal(l4->port, cal); | |
282 | gameport_register_port(l4->gameport); | |
283 | } | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int __init l4_init(void) | |
289 | { | |
290 | int i, cards = 0; | |
291 | ||
292 | if (!request_region(L4_PORT, 1, "lightning")) | |
6a89bc00 | 293 | return -EBUSY; |
1da177e4 LT |
294 | |
295 | for (i = 0; i < 2; i++) | |
296 | if (l4_add_card(i) == 0) | |
297 | cards++; | |
298 | ||
299 | outb(L4_SELECT_ANALOG, L4_PORT); | |
300 | ||
301 | if (!cards) { | |
302 | release_region(L4_PORT, 1); | |
6a89bc00 | 303 | return -ENODEV; |
1da177e4 LT |
304 | } |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static void __exit l4_exit(void) | |
310 | { | |
311 | int i; | |
312 | int cal[4] = { 59, 59, 59, 59 }; | |
313 | ||
314 | for (i = 0; i < 8; i++) | |
315 | if (l4_ports[i].gameport) { | |
316 | l4_setcal(l4_ports[i].port, cal); | |
317 | gameport_unregister_port(l4_ports[i].gameport); | |
318 | } | |
319 | ||
320 | outb(L4_SELECT_ANALOG, L4_PORT); | |
321 | release_region(L4_PORT, 1); | |
322 | } | |
323 | ||
324 | module_init(l4_init); | |
325 | module_exit(l4_exit); |