drivers/input/joystick/cobra.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * Creative Labs Blaster GamePad Cobra 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  * Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32 #include <linux/gameport.h>
  33 #include <linux/input.h>
  34 #include <linux/jiffies.h>
  35
  36 #define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"
  37
  38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39 MODULE_DESCRIPTION(DRIVER_DESC);
  40 MODULE_LICENSE("GPL");
  41
  42 #define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */
  43 #define COBRA_LENGTH            36
  44
  45 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 };
  46
  47 struct cobra {
  48         struct gameport *gameport;
  49         struct input_dev *dev[2];
  50         int reads;
  51         int bads;
  52         unsigned char exists;
  53         char phys[2][32];
  54 };
  55
  56 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)
  57 {
  58         unsigned long flags;
  59         unsigned char u, v, w;
  60         __u64 buf[2];
  61         int r[2], t[2];
  62         int i, j, ret;
  63
  64         int strobe = gameport_time(gameport, COBRA_MAX_STROBE);
  65
  66         for (i = 0; i < 2; i++) {
  67                 r[i] = buf[i] = 0;
  68                 t[i] = COBRA_MAX_STROBE;
  69         }
  70
  71         local_irq_save(flags);
  72
  73         u = gameport_read(gameport);
  74
  75         do {
  76                 t[0]--; t[1]--;
  77                 v = gameport_read(gameport);
  78                 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)
  79                         if (w & 0x30) {
  80                                 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {
  81                                         buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;
  82                                         t[i] = strobe;
  83                                         u = v;
  84                                 } else t[i] = 0;
  85                         }
  86         } while (t[0] > 0 || t[1] > 0);
  87
  88         local_irq_restore(flags);
  89
  90         ret = 0;
  91
  92         for (i = 0; i < 2; i++) {
  93
  94                 if (r[i] != COBRA_LENGTH) continue;
  95
  96                 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)
  97                         buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));
  98
  99                 if (j < COBRA_LENGTH) ret |= (1 << i);
 100
 101                 data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)
 102                         | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)
 103                         | ((buf[i] >> 11) & 0x1f00000);
 104
 105         }
 106
 107         return ret;
 108 }
 109
 110 static void cobra_poll(struct gameport *gameport)
 111 {
 112         struct cobra *cobra = gameport_get_drvdata(gameport);
 113         struct input_dev *dev;
 114         unsigned int data[2];
 115         int i, j, r;
 116
 117         cobra->reads++;
 118
 119         if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {
 120                 cobra->bads++;
 121                 return;
 122         }
 123
 124         for (i = 0; i < 2; i++)
 125                 if (cobra->exists & r & (1 << i)) {
 126
 127                         dev = cobra->dev[i];
 128
 129                         input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));
 130                         input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));
 131
 132                         for (j = 0; cobra_btn[j]; j++)
 133                                 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));
 134
 135                         input_sync(dev);
 136
 137                 }
 138 }
 139
 140 static int cobra_open(struct input_dev *dev)
 141 {
 142         struct cobra *cobra = input_get_drvdata(dev);
 143
 144         gameport_start_polling(cobra->gameport);
 145         return 0;
 146 }
 147
 148 static void cobra_close(struct input_dev *dev)
 149 {
 150         struct cobra *cobra = input_get_drvdata(dev);
 151
 152         gameport_stop_polling(cobra->gameport);
 153 }
 154
 155 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)
 156 {
 157         struct cobra *cobra;
 158         struct input_dev *input_dev;
 159         unsigned int data[2];
 160         int i, j;
 161         int err;
 162
 163         cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);
 164         if (!cobra)
 165                 return -ENOMEM;
 166
 167         cobra->gameport = gameport;
 168
 169         gameport_set_drvdata(gameport, cobra);
 170
 171         err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
 172         if (err)
 173                 goto fail1;
 174
 175         cobra->exists = cobra_read_packet(gameport, data);
 176
 177         for (i = 0; i < 2; i++)
 178                 if ((cobra->exists >> i) & data[i] & 1) {
 179                         printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"
 180                                 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);
 181                         cobra->exists &= ~(1 << i);
 182                 }
 183
 184         if (!cobra->exists) {
 185                 err = -ENODEV;
 186                 goto fail2;
 187         }
 188
 189         gameport_set_poll_handler(gameport, cobra_poll);
 190         gameport_set_poll_interval(gameport, 20);
 191
 192         for (i = 0; i < 2; i++) {
 193                 if (~(cobra->exists >> i) & 1)
 194                         continue;
 195
 196                 cobra->dev[i] = input_dev = input_allocate_device();
 197                 if (!input_dev) {
 198                         err = -ENOMEM;
 199                         goto fail3;
 200                 }
 201
 202                 snprintf(cobra->phys[i], sizeof(cobra->phys[i]),
 203                          "%s/input%d", gameport->phys, i);
 204
 205                 input_dev->name = "Creative Labs Blaster GamePad Cobra";
 206                 input_dev->phys = cobra->phys[i];
 207                 input_dev->id.bustype = BUS_GAMEPORT;
 208                 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;
 209                 input_dev->id.product = 0x0008;
 210                 input_dev->id.version = 0x0100;
 211                 input_dev->dev.parent = &gameport->dev;
 212
 213                 input_set_drvdata(input_dev, cobra);
 214
 215                 input_dev->open = cobra_open;
 216                 input_dev->close = cobra_close;
 217
 218                 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 219                 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);
 220                 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);
 221                 for (j = 0; cobra_btn[j]; j++)
 222                         set_bit(cobra_btn[j], input_dev->keybit);
 223
 224                 err = input_register_device(cobra->dev[i]);
 225                 if (err)
 226                         goto fail4;
 227         }
 228
 229         return 0;
 230
 231  fail4: input_free_device(cobra->dev[i]);
 232  fail3: while (--i >= 0)
 233                 if (cobra->dev[i])
 234                         input_unregister_device(cobra->dev[i]);
 235  fail2: gameport_close(gameport);
 236  fail1: gameport_set_drvdata(gameport, NULL);
 237         kfree(cobra);
 238         return err;
 239 }
 240
 241 static void cobra_disconnect(struct gameport *gameport)
 242 {
 243         struct cobra *cobra = gameport_get_drvdata(gameport);
 244         int i;
 245
 246         for (i = 0; i < 2; i++)
 247                 if ((cobra->exists >> i) & 1)
 248                         input_unregister_device(cobra->dev[i]);
 249         gameport_close(gameport);
 250         gameport_set_drvdata(gameport, NULL);
 251         kfree(cobra);
 252 }
 253
 254 static struct gameport_driver cobra_drv = {
 255         .driver         = {
 256                 .name   = "cobra",
 257         },
 258         .description    = DRIVER_DESC,
 259         .connect        = cobra_connect,
 260         .disconnect     = cobra_disconnect,
 261 };
 262
 263 module_gameport_driver(cobra_drv);