drivers/input/joydev.c

   1 /*
   2  * Joystick device driver for the input driver suite.
   3  *
   4  * Copyright (c) 1999-2002 Vojtech Pavlik
   5  * Copyright (c) 1999 Colin Van Dyke
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  */
  12
  13 #include <asm/io.h>
  14 #include <asm/system.h>
  15 #include <linux/delay.h>
  16 #include <linux/errno.h>
  17 #include <linux/joystick.h>
  18 #include <linux/input.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/slab.h>
  22 #include <linux/mm.h>
  23 #include <linux/miscdevice.h>
  24 #include <linux/module.h>
  25 #include <linux/poll.h>
  26 #include <linux/init.h>
  27 #include <linux/smp_lock.h>
  28 #include <linux/device.h>
  29
  30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  31 MODULE_DESCRIPTION("Joystick device interfaces");
  32 MODULE_SUPPORTED_DEVICE("input/js");
  33 MODULE_LICENSE("GPL");
  34
  35 #define JOYDEV_MINOR_BASE       0
  36 #define JOYDEV_MINORS           16
  37 #define JOYDEV_BUFFER_SIZE      64
  38
  39 struct joydev {
  40         int exist;
  41         int open;
  42         int minor;
  43         char name[16];
  44         struct input_handle handle;
  45         wait_queue_head_t wait;
  46         struct list_head list;
  47         struct js_corr corr[ABS_MAX + 1];
  48         struct JS_DATA_SAVE_TYPE glue;
  49         int nabs;
  50         int nkey;
  51         __u16 keymap[KEY_MAX - BTN_MISC + 1];
  52         __u16 keypam[KEY_MAX - BTN_MISC + 1];
  53         __u8 absmap[ABS_MAX + 1];
  54         __u8 abspam[ABS_MAX + 1];
  55         __s16 abs[ABS_MAX + 1];
  56 };
  57
  58 struct joydev_list {
  59         struct js_event buffer[JOYDEV_BUFFER_SIZE];
  60         int head;
  61         int tail;
  62         int startup;
  63         struct fasync_struct *fasync;
  64         struct joydev *joydev;
  65         struct list_head node;
  66 };
  67
  68 static struct joydev *joydev_table[JOYDEV_MINORS];
  69
  70 static int joydev_correct(int value, struct js_corr *corr)
  71 {
  72         switch (corr->type) {
  73                 case JS_CORR_NONE:
  74                         break;
  75                 case JS_CORR_BROKEN:
  76                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
  77                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
  78                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
  79                         break;
  80                 default:
  81                         return 0;
  82         }
  83
  84         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
  85 }
  86
  87 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  88 {
  89         struct joydev *joydev = handle->private;
  90         struct joydev_list *list;
  91         struct js_event event;
  92
  93         switch (type) {
  94
  95                 case EV_KEY:
  96                         if (code < BTN_MISC || value == 2)
  97                                 return;
  98                         event.type = JS_EVENT_BUTTON;
  99                         event.number = joydev->keymap[code - BTN_MISC];
 100                         event.value = value;
 101                         break;
 102
 103                 case EV_ABS:
 104                         event.type = JS_EVENT_AXIS;
 105                         event.number = joydev->absmap[code];
 106                         event.value = joydev_correct(value, joydev->corr + event.number);
 107                         if (event.value == joydev->abs[event.number])
 108                                 return;
 109                         joydev->abs[event.number] = event.value;
 110                         break;
 111
 112                 default:
 113                         return;
 114         }
 115
 116         event.time = jiffies_to_msecs(jiffies);
 117
 118         list_for_each_entry(list, &joydev->list, node) {
 119
 120                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
 121
 122                 if (list->startup == joydev->nabs + joydev->nkey)
 123                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 124                                 list->startup = 0;
 125
 126                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
 127         }
 128
 129         wake_up_interruptible(&joydev->wait);
 130 }
 131
 132 static int joydev_fasync(int fd, struct file *file, int on)
 133 {
 134         int retval;
 135         struct joydev_list *list = file->private_data;
 136
 137         retval = fasync_helper(fd, file, on, &list->fasync);
 138
 139         return retval < 0 ? retval : 0;
 140 }
 141
 142 static void joydev_free(struct joydev *joydev)
 143 {
 144         joydev_table[joydev->minor] = NULL;
 145         kfree(joydev);
 146 }
 147
 148 static int joydev_release(struct inode * inode, struct file * file)
 149 {
 150         struct joydev_list *list = file->private_data;
 151
 152         joydev_fasync(-1, file, 0);
 153
 154         list_del(&list->node);
 155
 156         if (!--list->joydev->open) {
 157                 if (list->joydev->exist)
 158                         input_close_device(&list->joydev->handle);
 159                 else
 160                         joydev_free(list->joydev);
 161         }
 162
 163         kfree(list);
 164         return 0;
 165 }
 166
 167 static int joydev_open(struct inode *inode, struct file *file)
 168 {
 169         struct joydev_list *list;
 170         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 171
 172         if (i >= JOYDEV_MINORS || !joydev_table[i])
 173                 return -ENODEV;
 174
 175         if (!(list = kzalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 176                 return -ENOMEM;
 177
 178         list->joydev = joydev_table[i];
 179         list_add_tail(&list->node, &joydev_table[i]->list);
 180         file->private_data = list;
 181
 182         if (!list->joydev->open++)
 183                 if (list->joydev->exist)
 184                         input_open_device(&list->joydev->handle);
 185
 186         return 0;
 187 }
 188
 189 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
 190 {
 191         return -EINVAL;
 192 }
 193
 194 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 195 {
 196         struct joydev_list *list = file->private_data;
 197         struct joydev *joydev = list->joydev;
 198         struct input_dev *input = joydev->handle.dev;
 199         int retval = 0;
 200
 201         if (!list->joydev->exist)
 202                 return -ENODEV;
 203
 204         if (count < sizeof(struct js_event))
 205                 return -EINVAL;
 206
 207         if (count == sizeof(struct JS_DATA_TYPE)) {
 208
 209                 struct JS_DATA_TYPE data;
 210                 int i;
 211
 212                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
 213                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
 214                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
 215                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
 216
 217                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
 218                         return -EFAULT;
 219
 220                 list->startup = 0;
 221                 list->tail = list->head;
 222
 223                 return sizeof(struct JS_DATA_TYPE);
 224         }
 225
 226         if (list->startup == joydev->nabs + joydev->nkey &&
 227             list->head == list->tail && (file->f_flags & O_NONBLOCK))
 228                 return -EAGAIN;
 229
 230         retval = wait_event_interruptible(list->joydev->wait,
 231                                           !list->joydev->exist ||
 232                                           list->startup < joydev->nabs + joydev->nkey ||
 233                                           list->head != list->tail);
 234
 235         if (retval)
 236                 return retval;
 237
 238         if (!list->joydev->exist)
 239                 return -ENODEV;
 240
 241         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
 242
 243                 struct js_event event;
 244
 245                 event.time = jiffies_to_msecs(jiffies);
 246
 247                 if (list->startup < joydev->nkey) {
 248                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
 249                         event.number = list->startup;
 250                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
 251                 } else {
 252                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
 253                         event.number = list->startup - joydev->nkey;
 254                         event.value = joydev->abs[event.number];
 255                 }
 256
 257                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
 258                         return -EFAULT;
 259
 260                 list->startup++;
 261                 retval += sizeof(struct js_event);
 262         }
 263
 264         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
 265
 266                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
 267                         return -EFAULT;
 268
 269                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
 270                 retval += sizeof(struct js_event);
 271         }
 272
 273         return retval;
 274 }
 275
 276 /* No kernel lock - fine */
 277 static unsigned int joydev_poll(struct file *file, poll_table *wait)
 278 {
 279         struct joydev_list *list = file->private_data;
 280
 281         poll_wait(file, &list->joydev->wait, wait);
 282         return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
 283                 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
 284 }
 285
 286 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 287 {
 288         struct input_dev *dev = joydev->handle.dev;
 289         int i, j;
 290
 291         switch (cmd) {
 292
 293                 case JS_SET_CAL:
 294                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 295                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 296
 297                 case JS_GET_CAL:
 298                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 299                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 300
 301                 case JS_SET_TIMEOUT:
 302                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 303
 304                 case JS_GET_TIMEOUT:
 305                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 306
 307                 case JSIOCGVERSION:
 308                         return put_user(JS_VERSION, (__u32 __user *) argp);
 309
 310                 case JSIOCGAXES:
 311                         return put_user(joydev->nabs, (__u8 __user *) argp);
 312
 313                 case JSIOCGBUTTONS:
 314                         return put_user(joydev->nkey, (__u8 __user *) argp);
 315
 316                 case JSIOCSCORR:
 317                         if (copy_from_user(joydev->corr, argp,
 318                                       sizeof(joydev->corr[0]) * joydev->nabs))
 319                             return -EFAULT;
 320                         for (i = 0; i < joydev->nabs; i++) {
 321                                 j = joydev->abspam[i];
 322                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 323                         }
 324                         return 0;
 325
 326                 case JSIOCGCORR:
 327                         return copy_to_user(argp, joydev->corr,
 328                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 329
 330                 case JSIOCSAXMAP:
 331                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 332                                 return -EFAULT;
 333                         for (i = 0; i < joydev->nabs; i++) {
 334                                 if (joydev->abspam[i] > ABS_MAX)
 335                                         return -EINVAL;
 336                                 joydev->absmap[joydev->abspam[i]] = i;
 337                         }
 338                         return 0;
 339
 340                 case JSIOCGAXMAP:
 341                         return copy_to_user(argp, joydev->abspam,
 342                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
 343
 344                 case JSIOCSBTNMAP:
 345                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 346                                 return -EFAULT;
 347                         for (i = 0; i < joydev->nkey; i++) {
 348                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
 349                                         return -EINVAL;
 350                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 351                         }
 352                         return 0;
 353
 354                 case JSIOCGBTNMAP:
 355                         return copy_to_user(argp, joydev->keypam,
 356                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
 357
 358                 default:
 359                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 360                                 int len;
 361                                 if (!dev->name)
 362                                         return 0;
 363                                 len = strlen(dev->name) + 1;
 364                                 if (len > _IOC_SIZE(cmd))
 365                                         len = _IOC_SIZE(cmd);
 366                                 if (copy_to_user(argp, dev->name, len))
 367                                         return -EFAULT;
 368                                 return len;
 369                         }
 370         }
 371         return -EINVAL;
 372 }
 373
 374 #ifdef CONFIG_COMPAT
 375 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 376 {
 377         struct joydev_list *list = file->private_data;
 378         struct joydev *joydev = list->joydev;
 379         void __user *argp = (void __user *)arg;
 380         s32 tmp32;
 381         struct JS_DATA_SAVE_TYPE_32 ds32;
 382         int err;
 383
 384         if (!joydev->exist)
 385                 return -ENODEV;
 386
 387         switch(cmd) {
 388         case JS_SET_TIMELIMIT:
 389                 err = get_user(tmp32, (s32 __user *) arg);
 390                 if (err == 0)
 391                         joydev->glue.JS_TIMELIMIT = tmp32;
 392                 break;
 393         case JS_GET_TIMELIMIT:
 394                 tmp32 = joydev->glue.JS_TIMELIMIT;
 395                 err = put_user(tmp32, (s32 __user *) arg);
 396                 break;
 397
 398         case JS_SET_ALL:
 399                 err = copy_from_user(&ds32, argp,
 400                                      sizeof(ds32)) ? -EFAULT : 0;
 401                 if (err == 0) {
 402                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 403                         joydev->glue.BUSY          = ds32.BUSY;
 404                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 405                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 406                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 407                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 408                 }
 409                 break;
 410
 411         case JS_GET_ALL:
 412                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 413                 ds32.BUSY          = joydev->glue.BUSY;
 414                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 415                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 416                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 417                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 418
 419                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
 420                 break;
 421
 422         default:
 423                 err = joydev_ioctl_common(joydev, cmd, argp);
 424         }
 425         return err;
 426 }
 427 #endif /* CONFIG_COMPAT */
 428
 429 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 430 {
 431         struct joydev_list *list = file->private_data;
 432         struct joydev *joydev = list->joydev;
 433         void __user *argp = (void __user *)arg;
 434
 435         if (!joydev->exist)
 436                 return -ENODEV;
 437
 438         switch(cmd) {
 439                 case JS_SET_TIMELIMIT:
 440                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 441                 case JS_GET_TIMELIMIT:
 442                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 443                 case JS_SET_ALL:
 444                         return copy_from_user(&joydev->glue, argp,
 445                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 446                 case JS_GET_ALL:
 447                         return copy_to_user(argp, &joydev->glue,
 448                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 449                 default:
 450                         return joydev_ioctl_common(joydev, cmd, argp);
 451         }
 452 }
 453
 454 static struct file_operations joydev_fops = {
 455         .owner =        THIS_MODULE,
 456         .read =         joydev_read,
 457         .write =        joydev_write,
 458         .poll =         joydev_poll,
 459         .open =         joydev_open,
 460         .release =      joydev_release,
 461         .ioctl =        joydev_ioctl,
 462 #ifdef CONFIG_COMPAT
 463         .compat_ioctl = joydev_compat_ioctl,
 464 #endif
 465         .fasync =       joydev_fasync,
 466 };
 467
 468 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 469 {
 470         struct joydev *joydev;
 471         struct class_device *cdev;
 472         int i, j, t, minor;
 473
 474         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 475         if (minor == JOYDEV_MINORS) {
 476                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 477                 return NULL;
 478         }
 479
 480         if (!(joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL)))
 481                 return NULL;
 482
 483         INIT_LIST_HEAD(&joydev->list);
 484         init_waitqueue_head(&joydev->wait);
 485
 486         joydev->minor = minor;
 487         joydev->exist = 1;
 488         joydev->handle.dev = dev;
 489         joydev->handle.name = joydev->name;
 490         joydev->handle.handler = handler;
 491         joydev->handle.private = joydev;
 492         sprintf(joydev->name, "js%d", minor);
 493
 494         for (i = 0; i < ABS_MAX + 1; i++)
 495                 if (test_bit(i, dev->absbit)) {
 496                         joydev->absmap[i] = joydev->nabs;
 497                         joydev->abspam[joydev->nabs] = i;
 498                         joydev->nabs++;
 499                 }
 500
 501         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 502                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 503                         joydev->keymap[i] = joydev->nkey;
 504                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 505                         joydev->nkey++;
 506                 }
 507
 508         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 509                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 510                         joydev->keymap[i] = joydev->nkey;
 511                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 512                         joydev->nkey++;
 513                 }
 514
 515         for (i = 0; i < joydev->nabs; i++) {
 516                 j = joydev->abspam[i];
 517                 if (dev->absmax[j] == dev->absmin[j]) {
 518                         joydev->corr[i].type = JS_CORR_NONE;
 519                         joydev->abs[i] = dev->abs[j];
 520                         continue;
 521                 }
 522                 joydev->corr[i].type = JS_CORR_BROKEN;
 523                 joydev->corr[i].prec = dev->absfuzz[j];
 524                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 525                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 526                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 527                         continue;
 528                 joydev->corr[i].coef[2] = (1 << 29) / t;
 529                 joydev->corr[i].coef[3] = (1 << 29) / t;
 530
 531                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 532         }
 533
 534         joydev_table[minor] = joydev;
 535
 536         cdev = class_device_create(&input_class, &dev->cdev,
 537                         MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 538                         dev->cdev.dev, joydev->name);
 539
 540         /* temporary symlink to keep userspace happy */
 541         sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
 542                           joydev->name);
 543
 544         return &joydev->handle;
 545 }
 546
 547 static void joydev_disconnect(struct input_handle *handle)
 548 {
 549         struct joydev *joydev = handle->private;
 550         struct joydev_list *list;
 551
 552         sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
 553         class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 554         joydev->exist = 0;
 555
 556         if (joydev->open) {
 557                 input_close_device(handle);
 558                 wake_up_interruptible(&joydev->wait);
 559                 list_for_each_entry(list, &joydev->list, node)
 560                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 561         } else
 562                 joydev_free(joydev);
 563 }
 564
 565 static struct input_device_id joydev_blacklist[] = {
 566         {
 567                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 568                 .evbit = { BIT(EV_KEY) },
 569                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 570         },      /* Avoid itouchpads, touchscreens and tablets */
 571         { }     /* Terminating entry */
 572 };
 573
 574 static struct input_device_id joydev_ids[] = {
 575         {
 576                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 577                 .evbit = { BIT(EV_ABS) },
 578                 .absbit = { BIT(ABS_X) },
 579         },
 580         {
 581                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 582                 .evbit = { BIT(EV_ABS) },
 583                 .absbit = { BIT(ABS_WHEEL) },
 584         },
 585         {
 586                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 587                 .evbit = { BIT(EV_ABS) },
 588                 .absbit = { BIT(ABS_THROTTLE) },
 589         },
 590         { }     /* Terminating entry */
 591 };
 592
 593 MODULE_DEVICE_TABLE(input, joydev_ids);
 594
 595 static struct input_handler joydev_handler = {
 596         .event =        joydev_event,
 597         .connect =      joydev_connect,
 598         .disconnect =   joydev_disconnect,
 599         .fops =         &joydev_fops,
 600         .minor =        JOYDEV_MINOR_BASE,
 601         .name =         "joydev",
 602         .id_table =     joydev_ids,
 603         .blacklist =    joydev_blacklist,
 604 };
 605
 606 static int __init joydev_init(void)
 607 {
 608         input_register_handler(&joydev_handler);
 609         return 0;
 610 }
 611
 612 static void __exit joydev_exit(void)
 613 {
 614         input_unregister_handler(&joydev_handler);
 615 }
 616
 617 module_init(joydev_init);
 618 module_exit(joydev_exit);