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