drivers/char/joystick/cobra.c

   1 /*
   2  * $Id: cobra.c,v 1.10 2000/06/08 10:23:45 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2000 Vojtech Pavlik
   5  *
   6  *  Sponsored by SuSE
   7  */
   8
   9 /*
  10  * Creative Labd Blaster GamePad Cobra driver for Linux
  11  */
  12
  13 /*
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  27  *
  28  * Should you need to contact me, the author, you can do so either by
  29  * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail:
  30  * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/malloc.h>
  36 #include <linux/init.h>
  37 #include <linux/gameport.h>
  38 #include <linux/input.h>
  39
  40 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  41 #define COBRA_REFRESH_TIME      HZ/50   /* 20 ms between reads */
  42 #define COBRA_LENGTH            36
  43
  44 static char* cobra_name = "Creative Labs Blaster GamePad Cobra";
  45
  46 static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };
  47
  48 struct cobra {
  49         struct gameport *gameport;
  50         struct timer_list timer;
  51         struct input_dev dev[2];
  52         int used;
  53         int reads;
  54         int bads;
  55         unsigned char exists;
  56 };
  57
  58 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  59 {
  60         unsigned long flags;
  61         unsigned char u, v, w;
  62         __u64 buf[2];
  63         int r[2], t[2];
  64         int i, j, ret;
  65
  66         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  67
  68         for (i = 0; i < 2; i++) {
  69                 r[i] = buf[i] = 0;
  70                 t[i] = COBRA_MAX_STROBE;
  71         }
  72
  73         __save_flags(flags);
  74         __cli();
  75
  76         u = gameport_read(gameport);
  77
  78         do {
  79                 t[0]--; t[1]--;
  80                 v = gameport_read(gameport);
  81                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  82                         if (w & 0x30) {
  83                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  84                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  85                                         t[i] = strobe;
  86                                         u = v;
  87                                 } else t[i] = 0;
  88                         }
  89         } while (t[0] > 0 || t[1] > 0);
  90
  91         __restore_flags(flags);
  92
  93         ret = 0;
  94
  95         for (i = 0; i < 2; i++) {
  96
  97                 if (r[i] != COBRA_LENGTH) continue;
  98
  99                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
 100                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
 101
 102                 if (j < COBRA_LENGTH) ret |= (1 << i);
 103
 104                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 105                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 106                         | ((buf[i] >> 11) & 0x1f00000);
 107
 108         }
 109
 110         return ret;
 111 }
 112
 113 static void cobra_timer(unsigned long private)
 114 {
 115         struct cobra *cobra = (void *) private;
 116         struct input_dev *dev;
 117         unsigned int data[2];
 118         int i, j, r;
 119
 120         cobra->reads++;
 121
 122         if ((r = cobra_read_packet(cobra->gameport, data)) != cobra->exists)
 123                 cobra->bads++;
 124
 125         for (i = 0; i < 2; i++)
 126                 if (cobra->exists & r & (1 << i)) {
 127
 128                         dev = cobra->dev + i;
 129
 130                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 131                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 132
 133                         for (j = 0; cobra_btn[j]; j++)
 134                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << i));
 135
 136                 }
 137
 138         mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
 139 }
 140
 141 static int cobra_open(struct input_dev *dev)
 142 {
 143         struct cobra *cobra = dev->private;
 144         if (!cobra->used++)
 145                 mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
 146         return 0;
 147 }
 148
 149 static void cobra_close(struct input_dev *dev)
 150 {
 151         struct cobra *cobra = dev->private;
 152         if (!--cobra->used)
 153                 del_timer(&cobra->timer);
 154 }
 155
 156 static void cobra_connect(struct gameport *gameport, struct gameport_dev *dev)
 157 {
 158         struct cobra *cobra;
 159         unsigned int data[2];
 160         int i, j;
 161
 162         if (!(cobra = kmalloc(sizeof(struct cobra), GFP_KERNEL)))
 163                 return;
 164         memset(cobra, 0, sizeof(struct cobra));
 165
 166         gameport->private = cobra;
 167
 168         cobra->gameport = gameport;
 169         init_timer(&cobra->timer);
 170         cobra->timer.data = (long) cobra;
 171         cobra->timer.function = cobra_timer;
 172
 173         if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
 174                 goto fail1;
 175
 176         cobra->exists = cobra_read_packet(gameport, data);
 177
 178         for (i = 0; i < 2; i++)
 179                 if ((cobra->exists >> i) & data[i] & 1) {
 180                         printk(KERN_WARNING "cobra.c: Device on gameport%d.%d has the Ext bit set. ID is: %d"
 181                                 " Contact vojtech@suse.cz\n", gameport->number, i, (data[i] >> 2) & 7);
 182                         cobra->exists &= ~(1 << i);
 183                 }
 184
 185         if (!cobra->exists)
 186                 goto fail2;
 187
 188         for (i = 0; i < 2; i++)
 189                 if ((cobra->exists >> i) & 1) {
 190
 191                         cobra->dev[i].private = cobra;
 192                         cobra->dev[i].open = cobra_open;
 193                         cobra->dev[i].close = cobra_close;
 194
 195                         cobra->dev[i].name = cobra_name;
 196                         cobra->dev[i].idbus = BUS_GAMEPORT;
 197                         cobra->dev[i].idvendor = GAMEPORT_ID_VENDOR_CREATIVE;
 198                         cobra->dev[i].idproduct = 0x0008;
 199                         cobra->dev[i].idversion = 0x0100;
 200
 201                         cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 202                         cobra->dev[i].absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 203
 204                         for (j = 0; cobra_btn[j]; j++)
 205                                 set_bit(cobra_btn[j], cobra->dev[i].keybit);
 206
 207                         cobra->dev[i].absmin[ABS_X] = -1; cobra->dev[i].absmax[ABS_X] = 1;
 208                         cobra->dev[i].absmin[ABS_Y] = -1; cobra->dev[i].absmax[ABS_Y] = 1;
 209
 210                         input_register_device(cobra->dev + i);
 211                         printk(KERN_INFO "input%d: %s on gameport%d.%d\n",
 212                                 cobra->dev[i].number, cobra_name, gameport->number, i);
 213                 }
 214
 215
 216         return;
 217 fail2:  gameport_close(gameport);
 218 fail1:  kfree(cobra);
 219 }
 220
 221 static void cobra_disconnect(struct gameport *gameport)
 222 {
 223         int i;
 224
 225         struct cobra *cobra = gameport->private;
 226         for (i = 0; i < 2; i++)
 227                 if ((cobra->exists >> i) & 1)
 228                         input_unregister_device(cobra->dev + i);
 229         gameport_close(gameport);
 230         kfree(cobra);
 231 }
 232
 233 static struct gameport_dev cobra_dev = {
 234         connect:        cobra_connect,
 235         disconnect:     cobra_disconnect,
 236 };
 237
 238 int __init cobra_init(void)
 239 {
 240         gameport_register_device(&cobra_dev);
 241         return 0;
 242 }
 243
 244 void __exit cobra_exit(void)
 245 {
 246         gameport_unregister_device(&cobra_dev);
 247 }
 248
 249 module_init(cobra_init);
 250 module_exit(cobra_exit);