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