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         if (value < -32767) return -32767;
  85         if (value >  32767) return  32767;
  86
  87         return value;
  88 }
  89
  90 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
  91 {
  92         struct joydev *joydev = handle->private;
  93         struct joydev_list *list;
  94         struct js_event event;
  95
  96         switch (type) {
  97
  98                 case EV_KEY:
  99                         if (code < BTN_MISC || value == 2) return;
 100                         event.type = JS_EVENT_BUTTON;
 101                         event.number = joydev->keymap[code - BTN_MISC];
 102                         event.value = value;
 103                         break;
 104
 105                 case EV_ABS:
 106                         event.type = JS_EVENT_AXIS;
 107                         event.number = joydev->absmap[code];
 108                         event.value = joydev_correct(value, joydev->corr + event.number);
 109                         if (event.value == joydev->abs[event.number]) return;
 110                         joydev->abs[event.number] = event.value;
 111                         break;
 112
 113                 default:
 114                         return;
 115         }
 116
 117         event.time = jiffies_to_msecs(jiffies);
 118
 119         list_for_each_entry(list, &joydev->list, node) {
 120
 121                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
 122
 123                 if (list->startup == joydev->nabs + joydev->nkey)
 124                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
 125                                 list->startup = 0;
 126
 127                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
 128         }
 129
 130         wake_up_interruptible(&joydev->wait);
 131 }
 132
 133 static int joydev_fasync(int fd, struct file *file, int on)
 134 {
 135         int retval;
 136         struct joydev_list *list = file->private_data;
 137         retval = fasync_helper(fd, file, on, &list->fasync);
 138         return retval < 0 ? retval : 0;
 139 }
 140
 141 static void joydev_free(struct joydev *joydev)
 142 {
 143         joydev_table[joydev->minor] = NULL;
 144         kfree(joydev);
 145 }
 146
 147 static int joydev_release(struct inode * inode, struct file * file)
 148 {
 149         struct joydev_list *list = file->private_data;
 150
 151         joydev_fasync(-1, file, 0);
 152
 153         list_del(&list->node);
 154
 155         if (!--list->joydev->open) {
 156                 if (list->joydev->exist)
 157                         input_close_device(&list->joydev->handle);
 158                 else
 159                         joydev_free(list->joydev);
 160         }
 161
 162         kfree(list);
 163         return 0;
 164 }
 165
 166 static int joydev_open(struct inode *inode, struct file *file)
 167 {
 168         struct joydev_list *list;
 169         int i = iminor(inode) - JOYDEV_MINOR_BASE;
 170
 171         if (i >= JOYDEV_MINORS || !joydev_table[i])
 172                 return -ENODEV;
 173
 174         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
 175                 return -ENOMEM;
 176         memset(list, 0, sizeof(struct joydev_list));
 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         poll_wait(file, &list->joydev->wait, wait);
 281         return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
 282                 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
 283 }
 284
 285 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
 286 {
 287         struct input_dev *dev = joydev->handle.dev;
 288         int i, j;
 289
 290         switch (cmd) {
 291
 292                 case JS_SET_CAL:
 293                         return copy_from_user(&joydev->glue.JS_CORR, argp,
 294                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 295                 case JS_GET_CAL:
 296                         return copy_to_user(argp, &joydev->glue.JS_CORR,
 297                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
 298                 case JS_SET_TIMEOUT:
 299                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 300                 case JS_GET_TIMEOUT:
 301                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
 302
 303                 case JSIOCGVERSION:
 304                         return put_user(JS_VERSION, (__u32 __user *) argp);
 305                 case JSIOCGAXES:
 306                         return put_user(joydev->nabs, (__u8 __user *) argp);
 307                 case JSIOCGBUTTONS:
 308                         return put_user(joydev->nkey, (__u8 __user *) argp);
 309                 case JSIOCSCORR:
 310                         if (copy_from_user(joydev->corr, argp,
 311                                       sizeof(joydev->corr[0]) * joydev->nabs))
 312                             return -EFAULT;
 313                         for (i = 0; i < joydev->nabs; i++) {
 314                                 j = joydev->abspam[i];
 315                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 316                         }
 317                         return 0;
 318                 case JSIOCGCORR:
 319                         return copy_to_user(argp, joydev->corr,
 320                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
 321                 case JSIOCSAXMAP:
 322                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
 323                                 return -EFAULT;
 324                         for (i = 0; i < joydev->nabs; i++) {
 325                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
 326                                 joydev->absmap[joydev->abspam[i]] = i;
 327                         }
 328                         return 0;
 329                 case JSIOCGAXMAP:
 330                         return copy_to_user(argp, joydev->abspam,
 331                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
 332                 case JSIOCSBTNMAP:
 333                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
 334                                 return -EFAULT;
 335                         for (i = 0; i < joydev->nkey; i++) {
 336                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
 337                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
 338                         }
 339                         return 0;
 340                 case JSIOCGBTNMAP:
 341                         return copy_to_user(argp, joydev->keypam,
 342                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
 343                 default:
 344                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
 345                                 int len;
 346                                 if (!dev->name) return 0;
 347                                 len = strlen(dev->name) + 1;
 348                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
 349                                 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
 350                                 return len;
 351                         }
 352         }
 353         return -EINVAL;
 354 }
 355
 356 #ifdef CONFIG_COMPAT
 357 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 358 {
 359         struct joydev_list *list = file->private_data;
 360         struct joydev *joydev = list->joydev;
 361         void __user *argp = (void __user *)arg;
 362         s32 tmp32;
 363         struct JS_DATA_SAVE_TYPE_32 ds32;
 364         int err;
 365
 366         if (!joydev->exist) return -ENODEV;
 367         switch(cmd) {
 368         case JS_SET_TIMELIMIT:
 369                 err = get_user(tmp32, (s32 __user *) arg);
 370                 if (err == 0)
 371                         joydev->glue.JS_TIMELIMIT = tmp32;
 372                 break;
 373         case JS_GET_TIMELIMIT:
 374                 tmp32 = joydev->glue.JS_TIMELIMIT;
 375                 err = put_user(tmp32, (s32 __user *) arg);
 376                 break;
 377
 378         case JS_SET_ALL:
 379                 err = copy_from_user(&ds32, argp,
 380                                      sizeof(ds32)) ? -EFAULT : 0;
 381                 if (err == 0) {
 382                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
 383                         joydev->glue.BUSY          = ds32.BUSY;
 384                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
 385                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
 386                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
 387                         joydev->glue.JS_CORR       = ds32.JS_CORR;
 388                 }
 389                 break;
 390
 391         case JS_GET_ALL:
 392                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
 393                 ds32.BUSY          = joydev->glue.BUSY;
 394                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
 395                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
 396                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
 397                 ds32.JS_CORR       = joydev->glue.JS_CORR;
 398
 399                 err = copy_to_user(argp, &ds32,
 400                                           sizeof(ds32)) ? -EFAULT : 0;
 401                 break;
 402
 403         default:
 404                 err = joydev_ioctl_common(joydev, cmd, argp);
 405         }
 406         return err;
 407 }
 408 #endif /* CONFIG_COMPAT */
 409
 410 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 411 {
 412         struct joydev_list *list = file->private_data;
 413         struct joydev *joydev = list->joydev;
 414         void __user *argp = (void __user *)arg;
 415
 416         if (!joydev->exist) return -ENODEV;
 417
 418         switch(cmd) {
 419                 case JS_SET_TIMELIMIT:
 420                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 421                 case JS_GET_TIMELIMIT:
 422                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
 423                 case JS_SET_ALL:
 424                         return copy_from_user(&joydev->glue, argp,
 425                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 426                 case JS_GET_ALL:
 427                         return copy_to_user(argp, &joydev->glue,
 428                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
 429                 default:
 430                         return joydev_ioctl_common(joydev, cmd, argp);
 431         }
 432 }
 433
 434 static struct file_operations joydev_fops = {
 435         .owner =        THIS_MODULE,
 436         .read =         joydev_read,
 437         .write =        joydev_write,
 438         .poll =         joydev_poll,
 439         .open =         joydev_open,
 440         .release =      joydev_release,
 441         .ioctl =        joydev_ioctl,
 442 #ifdef CONFIG_COMPAT
 443         .compat_ioctl = joydev_compat_ioctl,
 444 #endif
 445         .fasync =       joydev_fasync,
 446 };
 447
 448 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
 449 {
 450         struct joydev *joydev;
 451         int i, j, t, minor;
 452
 453         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
 454         if (minor == JOYDEV_MINORS) {
 455                 printk(KERN_ERR "joydev: no more free joydev devices\n");
 456                 return NULL;
 457         }
 458
 459         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
 460                 return NULL;
 461         memset(joydev, 0, sizeof(struct joydev));
 462
 463         INIT_LIST_HEAD(&joydev->list);
 464         init_waitqueue_head(&joydev->wait);
 465
 466         joydev->minor = minor;
 467         joydev->exist = 1;
 468         joydev->handle.dev = dev;
 469         joydev->handle.name = joydev->name;
 470         joydev->handle.handler = handler;
 471         joydev->handle.private = joydev;
 472         sprintf(joydev->name, "js%d", minor);
 473
 474         for (i = 0; i < ABS_MAX + 1; i++)
 475                 if (test_bit(i, dev->absbit)) {
 476                         joydev->absmap[i] = joydev->nabs;
 477                         joydev->abspam[joydev->nabs] = i;
 478                         joydev->nabs++;
 479                 }
 480
 481         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
 482                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 483                         joydev->keymap[i] = joydev->nkey;
 484                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 485                         joydev->nkey++;
 486                 }
 487
 488         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
 489                 if (test_bit(i + BTN_MISC, dev->keybit)) {
 490                         joydev->keymap[i] = joydev->nkey;
 491                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
 492                         joydev->nkey++;
 493                 }
 494
 495         for (i = 0; i < joydev->nabs; i++) {
 496                 j = joydev->abspam[i];
 497                 if (dev->absmax[j] == dev->absmin[j]) {
 498                         joydev->corr[i].type = JS_CORR_NONE;
 499                         joydev->abs[i] = dev->abs[j];
 500                         continue;
 501                 }
 502                 joydev->corr[i].type = JS_CORR_BROKEN;
 503                 joydev->corr[i].prec = dev->absfuzz[j];
 504                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
 505                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
 506                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
 507                         continue;
 508                 joydev->corr[i].coef[2] = (1 << 29) / t;
 509                 joydev->corr[i].coef[3] = (1 << 29) / t;
 510
 511                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
 512         }
 513
 514         joydev_table[minor] = joydev;
 515
 516         class_device_create(&input_dev_class, &dev->cdev,
 517                         MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
 518                         dev->cdev.dev, "js%d", minor);
 519
 520         return &joydev->handle;
 521 }
 522
 523 static void joydev_disconnect(struct input_handle *handle)
 524 {
 525         struct joydev *joydev = handle->private;
 526         struct joydev_list *list;
 527
 528         class_device_destroy(&input_dev_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
 529         joydev->exist = 0;
 530
 531         if (joydev->open) {
 532                 input_close_device(handle);
 533                 wake_up_interruptible(&joydev->wait);
 534                 list_for_each_entry(list, &joydev->list, node)
 535                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
 536         } else
 537                 joydev_free(joydev);
 538 }
 539
 540 static struct input_device_id joydev_blacklist[] = {
 541         {
 542                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
 543                 .evbit = { BIT(EV_KEY) },
 544                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
 545         },      /* Avoid itouchpads, touchscreens and tablets */
 546         { },    /* Terminating entry */
 547 };
 548
 549 static struct input_device_id joydev_ids[] = {
 550         {
 551                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 552                 .evbit = { BIT(EV_ABS) },
 553                 .absbit = { BIT(ABS_X) },
 554         },
 555         {
 556                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 557                 .evbit = { BIT(EV_ABS) },
 558                 .absbit = { BIT(ABS_WHEEL) },
 559         },
 560         {
 561                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
 562                 .evbit = { BIT(EV_ABS) },
 563                 .absbit = { BIT(ABS_THROTTLE) },
 564         },
 565         { },    /* Terminating entry */
 566 };
 567
 568 MODULE_DEVICE_TABLE(input, joydev_ids);
 569
 570 static struct input_handler joydev_handler = {
 571         .event =        joydev_event,
 572         .connect =      joydev_connect,
 573         .disconnect =   joydev_disconnect,
 574         .fops =         &joydev_fops,
 575         .minor =        JOYDEV_MINOR_BASE,
 576         .name =         "joydev",
 577         .id_table =     joydev_ids,
 578         .blacklist =    joydev_blacklist,
 579 };
 580
 581 static int __init joydev_init(void)
 582 {
 583         input_register_handler(&joydev_handler);
 584         return 0;
 585 }
 586
 587 static void __exit joydev_exit(void)
 588 {
 589         input_unregister_handler(&joydev_handler);
 590 }
 591
 592 module_init(joydev_init);
 593 module_exit(joydev_exit);