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 #define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"
  39
  40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  41 MODULE_DESCRIPTION(DRIVER_DESC);
  42 MODULE_LICENSE("GPL");
  43
  44 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  45 #define COBRA_LENGTH            36
  46
  47 static char* cobra_name = "Creative Labs Blaster GamePad Cobra";
  48
  49 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 };
  50
  51 struct cobra {
  52         struct gameport *gameport;
  53         struct input_dev dev[2];
  54         int reads;
  55         int bads;
  56         unsigned char exists;
  57         char phys[2][32];
  58 };
  59
  60 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  61 {
  62         unsigned long flags;
  63         unsigned char u, v, w;
  64         __u64 buf[2];
  65         int r[2], t[2];
  66         int i, j, ret;
  67
  68         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  69
  70         for (i = 0; i < 2; i++) {
  71                 r[i] = buf[i] = 0;
  72                 t[i] = COBRA_MAX_STROBE;
  73         }
  74
  75         local_irq_save(flags);
  76
  77         u = gameport_read(gameport);
  78
  79         do {
  80                 t[0]--; t[1]--;
  81                 v = gameport_read(gameport);
  82                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  83                         if (w & 0x30) {
  84                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  85                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  86                                         t[i] = strobe;
  87                                         u = v;
  88                                 } else t[i] = 0;
  89                         }
  90         } while (t[0] > 0 || t[1] > 0);
  91
  92         local_irq_restore(flags);
  93
  94         ret = 0;
  95
  96         for (i = 0; i < 2; i++) {
  97
  98                 if (r[i] != COBRA_LENGTH) continue;
  99
 100                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
 101                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
 102
 103                 if (j < COBRA_LENGTH) ret |= (1 << i);
 104
 105                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 106                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 107                         | ((buf[i] >> 11) & 0x1f00000);
 108
 109         }
 110
 111         return ret;
 112 }
 113
 114 static void cobra_poll(struct gameport *gameport)
 115 {
 116         struct cobra *cobra = gameport_get_drvdata(gameport);
 117         struct input_dev *dev;
 118         unsigned int data[2];
 119         int i, j, r;
 120
 121         cobra->reads++;
 122
 123         if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
 124                 cobra->bads++;
 125                 return;
 126         }
 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
 144 static int cobra_open(struct input_dev *dev)
 145 {
 146         struct cobra *cobra = dev->private;
 147
 148         gameport_start_polling(cobra->gameport);
 149         return 0;
 150 }
 151
 152 static void cobra_close(struct input_dev *dev)
 153 {
 154         struct cobra *cobra = dev->private;
 155
 156         gameport_stop_polling(cobra->gameport);
 157 }
 158
 159 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
 160 {
 161         struct cobra *cobra;
 162         unsigned int data[2];
 163         int i, j;
 164         int err;
 165
 166         if (!(cobra = kcalloc(1, sizeof(struct cobra), GFP_KERNEL)))
 167                 return -ENOMEM;
 168
 169         cobra->gameport = gameport;
 170
 171         gameport_set_drvdata(gameport, cobra);
 172
 173         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 174         if (err)
 175                 goto fail1;
 176
 177         cobra->exists = cobra_read_packet(gameport, data);
 178
 179         for (i = 0; i < 2; i++)
 180                 if ((cobra->exists >> i) & data[i] & 1) {
 181                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 182                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 183                         cobra->exists &= ~(1 << i);
 184                 }
 185
 186         if (!cobra->exists) {
 187                 err = -ENODEV;
 188                 goto fail2;
 189         }
 190
 191         gameport_set_poll_handler(gameport, cobra_poll);
 192         gameport_set_poll_interval(gameport, 20);
 193
 194         for (i = 0; i < 2; i++)
 195                 if ((cobra->exists >> i) & 1) {
 196
 197                         sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i);
 198
 199                         cobra->dev[i].private = cobra;
 200                         cobra->dev[i].open = cobra_open;
 201                         cobra->dev[i].close = cobra_close;
 202
 203                         cobra->dev[i].name = cobra_name;
 204                         cobra->dev[i].phys = cobra->phys[i];
 205                         cobra->dev[i].id.bustype = BUS_GAMEPORT;
 206                         cobra->dev[i].id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
 207                         cobra->dev[i].id.product = 0x0008;
 208                         cobra->dev[i].id.version = 0x0100;
 209
 210                         cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 211
 212                         input_set_abs_params(&cobra->dev[i], ABS_X, -1, 1, 0, 0);
 213                         input_set_abs_params(&cobra->dev[i], ABS_Y, -1, 1, 0, 0);
 214
 215                         for (j = 0; cobra_btn[j]; j++)
 216                                 set_bit(cobra_btn[j], cobra->dev[i].keybit);
 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 0;
 223
 224 fail2:  gameport_close(gameport);
 225 fail1:  gameport_set_drvdata(gameport, NULL);
 226         kfree(cobra);
 227         return err;
 228 }
 229
 230 static void cobra_disconnect(struct gameport *gameport)
 231 {
 232         struct cobra *cobra = gameport_get_drvdata(gameport);
 233         int i;
 234
 235         for (i = 0; i < 2; i++)
 236                 if ((cobra->exists >> i) & 1)
 237                         input_unregister_device(cobra->dev + i);
 238         gameport_close(gameport);
 239         gameport_set_drvdata(gameport, NULL);
 240         kfree(cobra);
 241 }
 242
 243 static struct gameport_driver cobra_drv = {
 244         .driver         = {
 245                 .name   = "cobra",
 246         },
 247         .description    = DRIVER_DESC,
 248         .connect        = cobra_connect,
 249         .disconnect     = cobra_disconnect,
 250 };
 251
 252 static int __init cobra_init(void)
 253 {
 254         gameport_register_driver(&cobra_drv);
 255         return 0;
 256 }
 257
 258 static void __exit cobra_exit(void)
 259 {
 260         gameport_unregister_driver(&cobra_drv);
 261 }
 262
 263 module_init(cobra_init);
 264 module_exit(cobra_exit);