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