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Linux kernel mirror (for testing)
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linux
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
52MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
53MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver");
54MODULE_LICENSE("GPL");
55
56struct l4 {
57 struct gameport *gameport;
58 unsigned char port;
59};
60
61static struct l4 l4_ports[8];
62
63/*
64 * l4_wait_ready() waits for the L4 to become ready.
65 */
66
67static 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
79static 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
108fail: outb(L4_SELECT_ANALOG, L4_PORT);
109 return result;
110}
111
112static 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
126static 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
154out: outb(L4_SELECT_ANALOG, L4_PORT);
155 return result;
156}
157
158/*
159 * l4_setcal() programs the L4 with calibration values.
160 */
161
162static 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
190out: 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
199static 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
222static 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
258static 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
307static int __init l4_init(void)
308{
309 int i, cards = 0;
310
311 if (!request_region(L4_PORT, 1, "lightning"))
312 return -EBUSY;
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);
322 return -ENODEV;
323 }
324
325 return 0;
326}
327
328static 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
343module_init(l4_init);
344module_exit(l4_exit);