drivers/input/joystick/cobra.c

   1 /*
   2  * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $
   3  *
   4  *  Copyright (c) 1999-2001 Vojtech Pavlik
   5  */
   6
   7 /*
   8  * Creative Labs Blaster GamePad Cobra 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 <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <linux/init.h>
  35 #include <linux/gameport.h>
  36 #include <linux/input.h>
  37
  38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39 MODULE_DESCRIPTION("Creative Labs Blaster GamePad Cobra driver");
  40 MODULE_LICENSE("GPL");
  41
  42 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  43 #define COBRA_REFRESH_TIME      HZ/50   /* 20 ms between reads */
  44 #define COBRA_LENGTH            36
  45
  46 static char* cobra_name = "Creative Labs Blaster GamePad Cobra";
  47
  48 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 };
  49
  50 struct cobra {
  51         struct gameport *gameport;
  52         struct timer_list timer;
  53         struct input_dev dev[2];
  54         int used;
  55         int reads;
  56         int bads;
  57         unsigned char exists;
  58         char phys[2][32];
  59 };
  60
  61 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  62 {
  63         unsigned long flags;
  64         unsigned char u, v, w;
  65         __u64 buf[2];
  66         int r[2], t[2];
  67         int i, j, ret;
  68
  69         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  70
  71         for (i = 0; i < 2; i++) {
  72                 r[i] = buf[i] = 0;
  73                 t[i] = COBRA_MAX_STROBE;
  74         }
  75
  76         local_irq_save(flags);
  77
  78         u = gameport_read(gameport);
  79
  80         do {
  81                 t[0]--; t[1]--;
  82                 v = gameport_read(gameport);
  83                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  84                         if (w & 0x30) {
  85                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  86                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  87                                         t[i] = strobe;
  88                                         u = v;
  89                                 } else t[i] = 0;
  90                         }
  91         } while (t[0] > 0 || t[1] > 0);
  92
  93         local_irq_restore(flags);
  94
  95         ret = 0;
  96
  97         for (i = 0; i < 2; i++) {
  98
  99                 if (r[i] != COBRA_LENGTH) continue;
 100
 101                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
 102                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
 103
 104                 if (j < COBRA_LENGTH) ret |= (1 << i);
 105
 106                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 107                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 108                         | ((buf[i] >> 11) & 0x1f00000);
 109
 110         }
 111
 112         return ret;
 113 }
 114
 115 static void cobra_timer(unsigned long private)
 116 {
 117         struct cobra *cobra = (void *) private;
 118         struct input_dev *dev;
 119         unsigned int data[2];
 120         int i, j, r;
 121
 122         cobra->reads++;
 123
 124         if ((r = cobra_read_packet(cobra->gameport, data)) != cobra->exists)
 125                 cobra->bads++;
 126         else
 127
 128         for (i = 0; i < 2; i++)
 129                 if (cobra->exists & r & (1 << i)) {
 130
 131                         dev = cobra->dev + i;
 132
 133                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 134                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 135
 136                         for (j = 0; cobra_btn[j]; j++)
 137                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
 138
 139                         input_sync(dev);
 140
 141                 }
 142
 143         mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
 144 }
 145
 146 static int cobra_open(struct input_dev *dev)
 147 {
 148         struct cobra *cobra = dev->private;
 149         if (!cobra->used++)
 150                 mod_timer(&cobra->timer, jiffies + COBRA_REFRESH_TIME);
 151         return 0;
 152 }
 153
 154 static void cobra_close(struct input_dev *dev)
 155 {
 156         struct cobra *cobra = dev->private;
 157         if (!--cobra->used)
 158                 del_timer(&cobra->timer);
 159 }
 160
 161 static void cobra_connect(struct gameport *gameport, struct gameport_dev *dev)
 162 {
 163         struct cobra *cobra;
 164         unsigned int data[2];
 165         int i, j;
 166
 167         if (!(cobra = kmalloc(sizeof(struct cobra), GFP_KERNEL)))
 168                 return;
 169         memset(cobra, 0, sizeof(struct cobra));
 170
 171         gameport->private = cobra;
 172
 173         cobra->gameport = gameport;
 174         init_timer(&cobra->timer);
 175         cobra->timer.data = (long) cobra;
 176         cobra->timer.function = cobra_timer;
 177
 178         if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW))
 179                 goto fail1;
 180
 181         cobra->exists = cobra_read_packet(gameport, data);
 182
 183         for (i = 0; i < 2; i++)
 184                 if ((cobra->exists >> i) & data[i] & 1) {
 185                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 186                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 187                         cobra->exists &= ~(1 << i);
 188                 }
 189
 190         if (!cobra->exists)
 191                 goto fail2;
 192
 193         for (i = 0; i < 2; i++)
 194                 if ((cobra->exists >> i) & 1) {
 195
 196                         sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
 197
 198                         cobra->dev[i].private = cobra;
 199                         cobra->dev[i].open = cobra_open;
 200                         cobra->dev[i].close = cobra_close;
 201
 202                         cobra->dev[i].name = cobra_name;
 203                         cobra->dev[i].phys = cobra->phys[i];
 204                         cobra->dev[i].id.bustype = BUS_GAMEPORT;
 205                         cobra->dev[i].id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
 206                         cobra->dev[i].id.product = 0x0008;
 207                         cobra->dev[i].id.version = 0x0100;
 208
 209                         cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 210                         cobra->dev[i].absbit[0] = BIT(ABS_X) | BIT(ABS_Y);
 211
 212                         for (j = 0; cobra_btn[j]; j++)
 213                                 set_bit(cobra_btn[j], cobra->dev[i].keybit);
 214
 215                         cobra->dev[i].absmin[ABS_X] = -1; cobra->dev[i].absmax[ABS_X] = 1;
 216                         cobra->dev[i].absmin[ABS_Y] = -1; cobra->dev[i].absmax[ABS_Y] = 1;
 217
 218                         input_register_device(cobra->dev + i);
 219                         printk(KERN_INFO "input: %s on %s\n", cobra_name, gameport->phys);
 220                 }
 221
 222         return;
 223 fail2:  gameport_close(gameport);
 224 fail1:  kfree(cobra);
 225 }
 226
 227 static void cobra_disconnect(struct gameport *gameport)
 228 {
 229         int i;
 230
 231         struct cobra *cobra = gameport->private;
 232         for (i = 0; i < 2; i++)
 233                 if ((cobra->exists >> i) & 1)
 234                         input_unregister_device(cobra->dev + i);
 235         gameport_close(gameport);
 236         kfree(cobra);
 237 }
 238
 239 static struct gameport_dev cobra_dev = {
 240         .connect =      cobra_connect,
 241         .disconnect =   cobra_disconnect,
 242 };
 243
 244 int __init cobra_init(void)
 245 {
 246         gameport_register_device(&cobra_dev);
 247         return 0;
 248 }
 249
 250 void __exit cobra_exit(void)
 251 {
 252         gameport_unregister_device(&cobra_dev);
 253 }
 254
 255 module_init(cobra_init);
 256 module_exit(cobra_exit);