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1da177e4 LT |
1 | /* |
2 | * $Id: lightning.c,v 1.20 2002/01/22 20:41:31 vojtech Exp $ | |
3 | * | |
4 | * Copyright (c) 1998-2001 Vojtech Pavlik | |
5 | */ | |
6 | ||
7 | /* | |
8 | * PDPI Lightning 4 gamecard driver for Linux. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | * | |
26 | * Should you need to contact me, the author, you can do so either by | |
27 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
28 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
29 | */ | |
30 | ||
31 | #include <asm/io.h> | |
32 | #include <linux/delay.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/gameport.h> | |
39 | #include <linux/slab.h> | |
40 | ||
41 | #define L4_PORT 0x201 | |
42 | #define L4_SELECT_ANALOG 0xa4 | |
43 | #define L4_SELECT_DIGITAL 0xa5 | |
44 | #define L4_SELECT_SECONDARY 0xa6 | |
45 | #define L4_CMD_ID 0x80 | |
46 | #define L4_CMD_GETCAL 0x92 | |
47 | #define L4_CMD_SETCAL 0x93 | |
48 | #define L4_ID 0x04 | |
49 | #define L4_BUSY 0x01 | |
50 | #define L4_TIMEOUT 80 /* 80 us */ | |
51 | ||
52 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
53 | MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
56 | struct l4 { | |
57 | struct gameport *gameport; | |
58 | unsigned char port; | |
59 | }; | |
60 | ||
61 | static struct l4 l4_ports[8]; | |
62 | ||
63 | /* | |
64 | * l4_wait_ready() waits for the L4 to become ready. | |
65 | */ | |
66 | ||
67 | static int l4_wait_ready(void) | |
68 | { | |
69 | unsigned int t = L4_TIMEOUT; | |
70 | ||
71 | while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--; | |
72 | return -(t <= 0); | |
73 | } | |
74 | ||
75 | /* | |
76 | * l4_cooked_read() reads data from the Lightning 4. | |
77 | */ | |
78 | ||
79 | static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons) | |
80 | { | |
81 | struct l4 *l4 = gameport->port_data; | |
82 | unsigned char status; | |
83 | int i, result = -1; | |
84 | ||
85 | outb(L4_SELECT_ANALOG, L4_PORT); | |
86 | outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT); | |
87 | ||
88 | if (inb(L4_PORT) & L4_BUSY) goto fail; | |
89 | outb(l4->port & 3, L4_PORT); | |
90 | ||
91 | if (l4_wait_ready()) goto fail; | |
92 | status = inb(L4_PORT); | |
93 | ||
94 | for (i = 0; i < 4; i++) | |
95 | if (status & (1 << i)) { | |
96 | if (l4_wait_ready()) goto fail; | |
97 | axes[i] = inb(L4_PORT); | |
98 | if (axes[i] > 252) axes[i] = -1; | |
99 | } | |
100 | ||
101 | if (status & 0x10) { | |
102 | if (l4_wait_ready()) goto fail; | |
103 | *buttons = inb(L4_PORT) & 0x0f; | |
104 | } | |
105 | ||
106 | result = 0; | |
107 | ||
108 | fail: outb(L4_SELECT_ANALOG, L4_PORT); | |
109 | return result; | |
110 | } | |
111 | ||
112 | static int l4_open(struct gameport *gameport, int mode) | |
113 | { | |
114 | struct l4 *l4 = gameport->port_data; | |
115 | ||
116 | if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED) | |
117 | return -1; | |
118 | outb(L4_SELECT_ANALOG, L4_PORT); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | /* | |
123 | * l4_getcal() reads the L4 with calibration values. | |
124 | */ | |
125 | ||
126 | static int l4_getcal(int port, int *cal) | |
127 | { | |
128 | int i, result = -1; | |
129 | ||
130 | outb(L4_SELECT_ANALOG, L4_PORT); | |
131 | outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT); | |
132 | if (inb(L4_PORT) & L4_BUSY) | |
133 | goto out; | |
134 | ||
135 | outb(L4_CMD_GETCAL, L4_PORT); | |
136 | if (l4_wait_ready()) | |
137 | goto out; | |
138 | ||
139 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) | |
140 | goto out; | |
141 | ||
142 | if (l4_wait_ready()) | |
143 | goto out; | |
144 | outb(port & 3, L4_PORT); | |
145 | ||
146 | for (i = 0; i < 4; i++) { | |
147 | if (l4_wait_ready()) | |
148 | goto out; | |
149 | cal[i] = inb(L4_PORT); | |
150 | } | |
151 | ||
152 | result = 0; | |
153 | ||
154 | out: outb(L4_SELECT_ANALOG, L4_PORT); | |
155 | return result; | |
156 | } | |
157 | ||
158 | /* | |
159 | * l4_setcal() programs the L4 with calibration values. | |
160 | */ | |
161 | ||
162 | static int l4_setcal(int port, int *cal) | |
163 | { | |
164 | int i, result = -1; | |
165 | ||
166 | outb(L4_SELECT_ANALOG, L4_PORT); | |
167 | outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT); | |
168 | if (inb(L4_PORT) & L4_BUSY) | |
169 | goto out; | |
170 | ||
171 | outb(L4_CMD_SETCAL, L4_PORT); | |
172 | if (l4_wait_ready()) | |
173 | goto out; | |
174 | ||
175 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) | |
176 | goto out; | |
177 | ||
178 | if (l4_wait_ready()) | |
179 | goto out; | |
180 | outb(port & 3, L4_PORT); | |
181 | ||
182 | for (i = 0; i < 4; i++) { | |
183 | if (l4_wait_ready()) | |
184 | goto out; | |
185 | outb(cal[i], L4_PORT); | |
186 | } | |
187 | ||
188 | result = 0; | |
189 | ||
190 | out: outb(L4_SELECT_ANALOG, L4_PORT); | |
191 | return result; | |
192 | } | |
193 | ||
194 | /* | |
195 | * l4_calibrate() calibrates the L4 for the attached device, so | |
196 | * that the device's resistance fits into the L4's 8-bit range. | |
197 | */ | |
198 | ||
199 | static int l4_calibrate(struct gameport *gameport, int *axes, int *max) | |
200 | { | |
201 | int i, t; | |
202 | int cal[4]; | |
203 | struct l4 *l4 = gameport->port_data; | |
204 | ||
205 | if (l4_getcal(l4->port, cal)) | |
206 | return -1; | |
207 | ||
208 | for (i = 0; i < 4; i++) { | |
209 | t = (max[i] * cal[i]) / 200; | |
210 | t = (t < 1) ? 1 : ((t > 255) ? 255 : t); | |
211 | axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t; | |
212 | axes[i] = (axes[i] > 252) ? 252 : axes[i]; | |
213 | cal[i] = t; | |
214 | } | |
215 | ||
216 | if (l4_setcal(l4->port, cal)) | |
217 | return -1; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int __init l4_create_ports(int card_no) | |
223 | { | |
224 | struct l4 *l4; | |
225 | struct gameport *port; | |
226 | int i, idx; | |
227 | ||
228 | for (i = 0; i < 4; i++) { | |
229 | ||
230 | idx = card_no * 4 + i; | |
231 | l4 = &l4_ports[idx]; | |
232 | ||
233 | if (!(l4->gameport = port = gameport_allocate_port())) { | |
234 | printk(KERN_ERR "lightning: Memory allocation failed\n"); | |
235 | while (--i >= 0) { | |
236 | gameport_free_port(l4->gameport); | |
237 | l4->gameport = NULL; | |
238 | } | |
239 | return -ENOMEM; | |
240 | } | |
241 | l4->port = idx; | |
242 | ||
243 | port->port_data = l4; | |
244 | port->open = l4_open; | |
245 | port->cooked_read = l4_cooked_read; | |
246 | port->calibrate = l4_calibrate; | |
247 | ||
248 | gameport_set_name(port, "PDPI Lightning 4"); | |
249 | gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx); | |
250 | ||
251 | if (idx == 0) | |
252 | port->io = L4_PORT; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int __init l4_add_card(int card_no) | |
259 | { | |
260 | int cal[4] = { 255, 255, 255, 255 }; | |
261 | int i, rev, result; | |
262 | struct l4 *l4; | |
263 | ||
264 | outb(L4_SELECT_ANALOG, L4_PORT); | |
265 | outb(L4_SELECT_DIGITAL + card_no, L4_PORT); | |
266 | ||
267 | if (inb(L4_PORT) & L4_BUSY) | |
268 | return -1; | |
269 | outb(L4_CMD_ID, L4_PORT); | |
270 | ||
271 | if (l4_wait_ready()) | |
272 | return -1; | |
273 | ||
274 | if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no) | |
275 | return -1; | |
276 | ||
277 | if (l4_wait_ready()) | |
278 | return -1; | |
279 | if (inb(L4_PORT) != L4_ID) | |
280 | return -1; | |
281 | ||
282 | if (l4_wait_ready()) | |
283 | return -1; | |
284 | rev = inb(L4_PORT); | |
285 | ||
286 | if (!rev) | |
287 | return -1; | |
288 | ||
289 | result = l4_create_ports(card_no); | |
290 | if (result) | |
291 | return result; | |
292 | ||
293 | printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n", | |
294 | card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT); | |
295 | ||
296 | for (i = 0; i < 4; i++) { | |
297 | l4 = &l4_ports[card_no * 4 + i]; | |
298 | ||
299 | if (rev > 0x28) /* on 2.9+ the setcal command works correctly */ | |
300 | l4_setcal(l4->port, cal); | |
301 | gameport_register_port(l4->gameport); | |
302 | } | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static int __init l4_init(void) | |
308 | { | |
309 | int i, cards = 0; | |
310 | ||
311 | if (!request_region(L4_PORT, 1, "lightning")) | |
6a89bc00 | 312 | return -EBUSY; |
1da177e4 LT |
313 | |
314 | for (i = 0; i < 2; i++) | |
315 | if (l4_add_card(i) == 0) | |
316 | cards++; | |
317 | ||
318 | outb(L4_SELECT_ANALOG, L4_PORT); | |
319 | ||
320 | if (!cards) { | |
321 | release_region(L4_PORT, 1); | |
6a89bc00 | 322 | return -ENODEV; |
1da177e4 LT |
323 | } |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static void __exit l4_exit(void) | |
329 | { | |
330 | int i; | |
331 | int cal[4] = { 59, 59, 59, 59 }; | |
332 | ||
333 | for (i = 0; i < 8; i++) | |
334 | if (l4_ports[i].gameport) { | |
335 | l4_setcal(l4_ports[i].port, cal); | |
336 | gameport_unregister_port(l4_ports[i].gameport); | |
337 | } | |
338 | ||
339 | outb(L4_SELECT_ANALOG, L4_PORT); | |
340 | release_region(L4_PORT, 1); | |
341 | } | |
342 | ||
343 | module_init(l4_init); | |
344 | module_exit(l4_exit); |