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 };
  60
  61 static struct l4 l4_ports[8];
  62
  63 /*
  64  * l4_wait_ready() waits for the L4 to become ready.
  65  */
  66
  67 static 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
  79 static 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
 108 fail:   outb(L4_SELECT_ANALOG, L4_PORT);
 109         return result;
 110 }
 111
 112 static 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
 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         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
 154 out:    outb(L4_SELECT_ANALOG, L4_PORT);
 155         return result;
 156 }
 157
 158 /*
 159  * l4_setcal() programs the L4 with calibration values.
 160  */
 161
 162 static 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
 190 out:    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
 199 static 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
 222 static 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
 258 static 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
 307 static 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
 328 static 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
 343 module_init(l4_init);
 344 module_exit(l4_exit);