drivers/input/gameport/lightning.c

   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         char phys[32];
  60 } *l4_port[8];
  61
  62 char l4_name[] = "PDPI Lightning 4";
  63
  64 /*
  65  * l4_wait_ready() waits for the L4 to become ready.
  66  */
  67
  68 static int l4_wait_ready(void)
  69 {
  70         unsigned int t;
  71         t = L4_TIMEOUT;
  72         while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--;
  73         return -(t<=0);
  74 }
  75
  76 /*
  77  * l4_cooked_read() reads data from the Lightning 4.
  78  */
  79
  80 static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons)
  81 {
  82         struct l4 *l4 = gameport->driver;
  83         unsigned char status;
  84         int i, result = -1;
  85
  86         outb(L4_SELECT_ANALOG, L4_PORT);
  87         outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);
  88
  89         if (inb(L4_PORT) & L4_BUSY) goto fail;
  90         outb(l4->port & 3, L4_PORT);
  91
  92         if (l4_wait_ready()) goto fail;
  93         status = inb(L4_PORT);
  94
  95         for (i = 0; i < 4; i++)
  96                 if (status & (1 << i)) {
  97                         if (l4_wait_ready()) goto fail;
  98                         axes[i] = inb(L4_PORT);
  99                         if (axes[i] > 252) axes[i] = -1;
 100                 }
 101
 102         if (status & 0x10) {
 103                 if (l4_wait_ready()) goto fail;
 104                 *buttons = inb(L4_PORT) & 0x0f;
 105         }
 106
 107         result = 0;
 108
 109 fail:   outb(L4_SELECT_ANALOG, L4_PORT);
 110         return result;
 111 }
 112
 113 static int l4_open(struct gameport *gameport, int mode)
 114 {
 115         struct l4 *l4 = gameport->driver;
 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
 133         if (inb(L4_PORT) & L4_BUSY) goto fail;
 134         outb(L4_CMD_GETCAL, L4_PORT);
 135
 136         if (l4_wait_ready()) goto fail;
 137         if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) goto fail;
 138
 139         if (l4_wait_ready()) goto fail;
 140         outb(port & 3, L4_PORT);
 141
 142         for (i = 0; i < 4; i++) {
 143                 if (l4_wait_ready()) goto fail;
 144                 cal[i] = inb(L4_PORT);
 145         }
 146
 147         result = 0;
 148
 149 fail:   outb(L4_SELECT_ANALOG, L4_PORT);
 150         return result;
 151 }
 152
 153 /*
 154  * l4_setcal() programs the L4 with calibration values.
 155  */
 156
 157 static int l4_setcal(int port, int *cal)
 158 {
 159         int i, result = -1;
 160
 161         outb(L4_SELECT_ANALOG, L4_PORT);
 162         outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
 163
 164         if (inb(L4_PORT) & L4_BUSY) goto fail;
 165         outb(L4_CMD_SETCAL, L4_PORT);
 166
 167         if (l4_wait_ready()) goto fail;
 168         if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2)) goto fail;
 169
 170         if (l4_wait_ready()) goto fail;
 171         outb(port & 3, L4_PORT);
 172
 173         for (i = 0; i < 4; i++) {
 174                 if (l4_wait_ready()) goto fail;
 175                 outb(cal[i], L4_PORT);
 176         }
 177
 178         result = 0;
 179
 180 fail:   outb(L4_SELECT_ANALOG, L4_PORT);
 181         return result;
 182 }
 183
 184 /*
 185  * l4_calibrate() calibrates the L4 for the attached device, so
 186  * that the device's resistance fits into the L4's 8-bit range.
 187  */
 188
 189 static int l4_calibrate(struct gameport *gameport, int *axes, int *max)
 190 {
 191         int i, t;
 192         int cal[4];
 193         struct l4 *l4 = gameport->driver;
 194
 195         if (l4_getcal(l4->port, cal))
 196                 return -1;
 197
 198         for (i = 0; i < 4; i++) {
 199                 t = (max[i] * cal[i]) / 200;
 200                 t = (t < 1) ? 1 : ((t > 255) ? 255 : t);
 201                 axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t;
 202                 axes[i] = (axes[i] > 252) ? 252 : axes[i];
 203                 cal[i] = t;
 204         }
 205
 206         if (l4_setcal(l4->port, cal))
 207                 return -1;
 208
 209         return 0;
 210 }
 211
 212 static int __init l4_init(void)
 213 {
 214         int cal[4] = {255,255,255,255};
 215         int i, j, rev, cards = 0;
 216         struct gameport *gameport;
 217         struct l4 *l4;
 218
 219         if (!request_region(L4_PORT, 1, "lightning"))
 220                 return -1;
 221
 222         for (i = 0; i < 2; i++) {
 223
 224                 outb(L4_SELECT_ANALOG, L4_PORT);
 225                 outb(L4_SELECT_DIGITAL + i, L4_PORT);
 226
 227                 if (inb(L4_PORT) & L4_BUSY) continue;
 228                 outb(L4_CMD_ID, L4_PORT);
 229
 230                 if (l4_wait_ready()) continue;
 231                 if (inb(L4_PORT) != L4_SELECT_DIGITAL + i) continue;
 232
 233                 if (l4_wait_ready()) continue;
 234                 if (inb(L4_PORT) != L4_ID) continue;
 235
 236                 if (l4_wait_ready()) continue;
 237                 rev = inb(L4_PORT);
 238
 239                 if (!rev) continue;
 240
 241                 if (!(l4_port[i * 4] = kmalloc(sizeof(struct l4) * 4, GFP_KERNEL))) {
 242                         printk(KERN_ERR "lightning: Out of memory allocating ports.\n");
 243                         continue;
 244                 }
 245                 memset(l4_port[i * 4], 0, sizeof(struct l4) * 4);
 246
 247                 for (j = 0; j < 4; j++) {
 248
 249                         l4 = l4_port[i * 4 + j] = l4_port[i * 4] + j;
 250                         l4->port = i * 4 + j;
 251
 252                         sprintf(l4->phys, "isa%04x/gameport%d", L4_PORT, 4 * i + j);
 253
 254                         gameport = &l4->gameport;
 255                         gameport->driver = l4;
 256                         gameport->open = l4_open;
 257                         gameport->cooked_read = l4_cooked_read;
 258                         gameport->calibrate = l4_calibrate;
 259
 260                         gameport->name = l4_name;
 261                         gameport->phys = l4->phys;
 262                         gameport->id.bustype = BUS_ISA;
 263
 264                         if (!i && !j)
 265                                 gameport->io = L4_PORT;
 266
 267                         if (rev > 0x28)         /* on 2.9+ the setcal command works correctly */
 268                                 l4_setcal(l4->port, cal);
 269
 270                         gameport_register_port(gameport);
 271                 }
 272
 273                 printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n",
 274                         i ? "secondary" : "primary", rev >> 4, rev, L4_PORT);
 275
 276                 cards++;
 277         }
 278
 279         outb(L4_SELECT_ANALOG, L4_PORT);
 280
 281         if (!cards) {
 282                 release_region(L4_PORT, 1);
 283                 return -1;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static void __exit l4_exit(void)
 290 {
 291         int i;
 292         int cal[4] = {59, 59, 59, 59};
 293
 294         for (i = 0; i < 8; i++)
 295                 if (l4_port[i]) {
 296                         l4_setcal(l4_port[i]->port, cal);
 297                         gameport_unregister_port(&l4_port[i]->gameport);
 298                 }
 299         outb(L4_SELECT_ANALOG, L4_PORT);
 300         release_region(L4_PORT, 1);
 301 }
 302
 303 module_init(l4_init);
 304 module_exit(l4_exit);