drivers/input/gameport/lightning.c

   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
  25 #include <asm/io.h>
  26 #include <linux/delay.h>
  27 #include <linux/errno.h>
  28 #include <linux/ioport.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/gameport.h>
  33
  34 #define L4_PORT                 0x201
  35 #define L4_SELECT_ANALOG        0xa4
  36 #define L4_SELECT_DIGITAL       0xa5
  37 #define L4_SELECT_SECONDARY     0xa6
  38 #define L4_CMD_ID               0x80
  39 #define L4_CMD_GETCAL           0x92
  40 #define L4_CMD_SETCAL           0x93
  41 #define L4_ID                   0x04
  42 #define L4_BUSY                 0x01
  43 #define L4_TIMEOUT              80      /* 80 us */
  44
  45 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  46 MODULE_DESCRIPTION("PDPI Lightning 4 gamecard driver");
  47 MODULE_LICENSE("GPL");
  48
  49 struct l4 {
  50         struct gameport *gameport;
  51         unsigned char port;
  52 };
  53
  54 static struct l4 l4_ports[8];
  55
  56 /*
  57  * l4_wait_ready() waits for the L4 to become ready.
  58  */
  59
  60 static int l4_wait_ready(void)
  61 {
  62         unsigned int t = L4_TIMEOUT;
  63
  64         while ((inb(L4_PORT) & L4_BUSY) && t > 0) t--;
  65         return -(t <= 0);
  66 }
  67
  68 /*
  69  * l4_cooked_read() reads data from the Lightning 4.
  70  */
  71
  72 static int l4_cooked_read(struct gameport *gameport, int *axes, int *buttons)
  73 {
  74         struct l4 *l4 = gameport->port_data;
  75         unsigned char status;
  76         int i, result = -1;
  77
  78         outb(L4_SELECT_ANALOG, L4_PORT);
  79         outb(L4_SELECT_DIGITAL + (l4->port >> 2), L4_PORT);
  80
  81         if (inb(L4_PORT) & L4_BUSY) goto fail;
  82         outb(l4->port & 3, L4_PORT);
  83
  84         if (l4_wait_ready()) goto fail;
  85         status = inb(L4_PORT);
  86
  87         for (i = 0; i < 4; i++)
  88                 if (status & (1 << i)) {
  89                         if (l4_wait_ready()) goto fail;
  90                         axes[i] = inb(L4_PORT);
  91                         if (axes[i] > 252) axes[i] = -1;
  92                 }
  93
  94         if (status & 0x10) {
  95                 if (l4_wait_ready()) goto fail;
  96                 *buttons = inb(L4_PORT) & 0x0f;
  97         }
  98
  99         result = 0;
 100
 101 fail:   outb(L4_SELECT_ANALOG, L4_PORT);
 102         return result;
 103 }
 104
 105 static int l4_open(struct gameport *gameport, int mode)
 106 {
 107         struct l4 *l4 = gameport->port_data;
 108
 109         if (l4->port != 0 && mode != GAMEPORT_MODE_COOKED)
 110                 return -1;
 111         outb(L4_SELECT_ANALOG, L4_PORT);
 112         return 0;
 113 }
 114
 115 /*
 116  * l4_getcal() reads the L4 with calibration values.
 117  */
 118
 119 static int l4_getcal(int port, int *cal)
 120 {
 121         int i, result = -1;
 122
 123         outb(L4_SELECT_ANALOG, L4_PORT);
 124         outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
 125         if (inb(L4_PORT) & L4_BUSY)
 126                 goto out;
 127
 128         outb(L4_CMD_GETCAL, L4_PORT);
 129         if (l4_wait_ready())
 130                 goto out;
 131
 132         if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
 133                 goto out;
 134
 135         if (l4_wait_ready())
 136                 goto out;
 137         outb(port & 3, L4_PORT);
 138
 139         for (i = 0; i < 4; i++) {
 140                 if (l4_wait_ready())
 141                         goto out;
 142                 cal[i] = inb(L4_PORT);
 143         }
 144
 145         result = 0;
 146
 147 out:    outb(L4_SELECT_ANALOG, L4_PORT);
 148         return result;
 149 }
 150
 151 /*
 152  * l4_setcal() programs the L4 with calibration values.
 153  */
 154
 155 static int l4_setcal(int port, int *cal)
 156 {
 157         int i, result = -1;
 158
 159         outb(L4_SELECT_ANALOG, L4_PORT);
 160         outb(L4_SELECT_DIGITAL + (port >> 2), L4_PORT);
 161         if (inb(L4_PORT) & L4_BUSY)
 162                 goto out;
 163
 164         outb(L4_CMD_SETCAL, L4_PORT);
 165         if (l4_wait_ready())
 166                 goto out;
 167
 168         if (inb(L4_PORT) != L4_SELECT_DIGITAL + (port >> 2))
 169                 goto out;
 170
 171         if (l4_wait_ready())
 172                 goto out;
 173         outb(port & 3, L4_PORT);
 174
 175         for (i = 0; i < 4; i++) {
 176                 if (l4_wait_ready())
 177                         goto out;
 178                 outb(cal[i], L4_PORT);
 179         }
 180
 181         result = 0;
 182
 183 out:    outb(L4_SELECT_ANALOG, L4_PORT);
 184         return result;
 185 }
 186
 187 /*
 188  * l4_calibrate() calibrates the L4 for the attached device, so
 189  * that the device's resistance fits into the L4's 8-bit range.
 190  */
 191
 192 static int l4_calibrate(struct gameport *gameport, int *axes, int *max)
 193 {
 194         int i, t;
 195         int cal[4];
 196         struct l4 *l4 = gameport->port_data;
 197
 198         if (l4_getcal(l4->port, cal))
 199                 return -1;
 200
 201         for (i = 0; i < 4; i++) {
 202                 t = (max[i] * cal[i]) / 200;
 203                 t = (t < 1) ? 1 : ((t > 255) ? 255 : t);
 204                 axes[i] = (axes[i] < 0) ? -1 : (axes[i] * cal[i]) / t;
 205                 axes[i] = (axes[i] > 252) ? 252 : axes[i];
 206                 cal[i] = t;
 207         }
 208
 209         if (l4_setcal(l4->port, cal))
 210                 return -1;
 211
 212         return 0;
 213 }
 214
 215 static int __init l4_create_ports(int card_no)
 216 {
 217         struct l4 *l4;
 218         struct gameport *port;
 219         int i, idx;
 220
 221         for (i = 0; i < 4; i++) {
 222
 223                 idx = card_no * 4 + i;
 224                 l4 = &l4_ports[idx];
 225
 226                 if (!(l4->gameport = port = gameport_allocate_port())) {
 227                         printk(KERN_ERR "lightning: Memory allocation failed\n");
 228                         while (--i >= 0) {
 229                                 gameport_free_port(l4->gameport);
 230                                 l4->gameport = NULL;
 231                         }
 232                         return -ENOMEM;
 233                 }
 234                 l4->port = idx;
 235
 236                 port->port_data = l4;
 237                 port->open = l4_open;
 238                 port->cooked_read = l4_cooked_read;
 239                 port->calibrate = l4_calibrate;
 240
 241                 gameport_set_name(port, "PDPI Lightning 4");
 242                 gameport_set_phys(port, "isa%04x/gameport%d", L4_PORT, idx);
 243
 244                 if (idx == 0)
 245                         port->io = L4_PORT;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static int __init l4_add_card(int card_no)
 252 {
 253         int cal[4] = { 255, 255, 255, 255 };
 254         int i, rev, result;
 255         struct l4 *l4;
 256
 257         outb(L4_SELECT_ANALOG, L4_PORT);
 258         outb(L4_SELECT_DIGITAL + card_no, L4_PORT);
 259
 260         if (inb(L4_PORT) & L4_BUSY)
 261                 return -1;
 262         outb(L4_CMD_ID, L4_PORT);
 263
 264         if (l4_wait_ready())
 265                 return -1;
 266
 267         if (inb(L4_PORT) != L4_SELECT_DIGITAL + card_no)
 268                 return -1;
 269
 270         if (l4_wait_ready())
 271                 return -1;
 272         if (inb(L4_PORT) != L4_ID)
 273                 return -1;
 274
 275         if (l4_wait_ready())
 276                 return -1;
 277         rev = inb(L4_PORT);
 278
 279         if (!rev)
 280                 return -1;
 281
 282         result = l4_create_ports(card_no);
 283         if (result)
 284                 return result;
 285
 286         printk(KERN_INFO "gameport: PDPI Lightning 4 %s card v%d.%d at %#x\n",
 287                 card_no ? "secondary" : "primary", rev >> 4, rev, L4_PORT);
 288
 289         for (i = 0; i < 4; i++) {
 290                 l4 = &l4_ports[card_no * 4 + i];
 291
 292                 if (rev > 0x28)         /* on 2.9+ the setcal command works correctly */
 293                         l4_setcal(l4->port, cal);
 294                 gameport_register_port(l4->gameport);
 295         }
 296
 297         return 0;
 298 }
 299
 300 static int __init l4_init(void)
 301 {
 302         int i, cards = 0;
 303
 304         if (!request_region(L4_PORT, 1, "lightning"))
 305                 return -EBUSY;
 306
 307         for (i = 0; i < 2; i++)
 308                 if (l4_add_card(i) == 0)
 309                         cards++;
 310
 311         outb(L4_SELECT_ANALOG, L4_PORT);
 312
 313         if (!cards) {
 314                 release_region(L4_PORT, 1);
 315                 return -ENODEV;
 316         }
 317
 318         return 0;
 319 }
 320
 321 static void __exit l4_exit(void)
 322 {
 323         int i;
 324         int cal[4] = { 59, 59, 59, 59 };
 325
 326         for (i = 0; i < 8; i++)
 327                 if (l4_ports[i].gameport) {
 328                         l4_setcal(l4_ports[i].port, cal);
 329                         gameport_unregister_port(l4_ports[i].gameport);
 330                 }
 331
 332         outb(L4_SELECT_ANALOG, L4_PORT);
 333         release_region(L4_PORT, 1);
 334 }
 335
 336 module_init(l4_init);
 337 module_exit(l4_exit);